CN118913553A - Self-adaptive pressure regulating system of air tightness detection equipment - Google Patents

Abstract

The present application relates to an adaptive pressure regulating system for airtightness testing equipment, wherein a closed chamber contains a test object and maintains a constant temperature of the external environment of the test object; a pressure applying device inputs a required amount of gas to the test object; a first flow meter measures the gas inflow of the test object in real time to obtain the gas inflow of the test object; a second flow meter measures the gas outflow of the test object in real time to obtain the gas outflow of the test object; a probe of a temperature sensor monitors the temperature of the internal space of the test object in real time to obtain temperature data inside the test object. When the gas outflow of the test object is greater than the gas inflow of the test object, the control unit dynamically adjusts the gas input amount of the pressure applying device to the test object according to the internal temperature value of the test object, the temperature value between the outside of the test object and the inside of the closed chamber, the gas inflow of the test object, and the gas outflow of the test object to compensate for the pressure change caused by the temperature change, and at the same time calculates the leakage amount and leakage rate through the influence on the gas volume.

Description

Adaptive pressure regulation system for air tightness testing equipment

Technical Field

The present application relates to the technical field of air tightness detection equipment, and in particular to an adaptive pressure regulating system of air tightness detection equipment.

Background Art

Airtightness testing equipment is widely used in industrial production to ensure the sealing performance of products or containers under specified pressure and environmental conditions, and to prevent safety accidents or product quality problems that may be caused by leakage. According to the different detection principles and implementation methods, airtightness testing equipment is mainly divided into several types, such as differential pressure detection, flow detection, helium mass spectrometry detection, ultrasonic detection and vacuum leak detection. Among them, the flow detection equipment determines whether there is a leak by applying a certain pressure to the test object and monitoring the gas flow required to maintain the pressure. This method involves applying pressure after sealing the test object, and then measuring the amount of gas flowing in or out to maintain the pressure through a flowmeter. If a continuous or changing supplementary flow is detected, it means that the object may have a leak. By calculating the difference in the inflow and outflow of gas flow, the equipment can accurately quantify the leakage rate, so that it can not only detect whether there is a leak, but also determine the specific size of the leak. This makes the flow detection equipment very suitable for applications that require extremely high leak sensitivity and accuracy, such as precision manufacturing, medical equipment, automotive fuel systems, and high-pressure pipelines. The characteristic is that it can provide accurate and quantifiable leakage data to support detailed monitoring and management of product quality.

Existing flow detection equipment is usually equipped with a pressure regulating device, which can adaptively adjust to maintain a specific pressure in the test object. This pressure regulating device automatically replenishes the required gas through a feedback control mechanism to compensate for the pressure drop caused by leakage, ensuring the continuity and accuracy of the detection.

The pressure regulating devices of existing flow detection equipment are mainly designed to respond to the pressure changes inside the detection object, with the purpose of maintaining the internal pressure stable to ensure the accuracy of the detection results. However, these systems usually fail to fully consider the significant impact of external environmental factors, especially temperature changes on pressure.

In a fast and continuous production line, the parts of the equipment often go through multiple processes in a short period of time, including air tightness testing. In this case, the parts may generate heat during the manufacturing process, making their temperature higher than the surrounding environment. If the air tightness test is performed immediately without enough time for the temperature of the parts to naturally adapt to the ambient temperature, inaccurate test results may result. Because at higher temperatures, the gas inside the parts will expand and increase the internal pressure, which may calculate the wrong leakage volume and leakage rate. This misjudgment caused by temperature changes is particularly problematic in industrial environments that require rapid and continuous production. In addition, in areas with a large temperature difference between day and night, such as Xinjiang, changes in the external ambient temperature of the test object can affect the volume and pressure of the internal gas, thereby affecting the calculation of the leakage rate. The continuous error caused by temperature fluctuations not only affects the long-term operation of the equipment, but also seriously affects the accuracy of the data.

Therefore, although existing flow-type testing equipment technically has pressure regulation capabilities, these systems mainly respond to internal pressure changes and fail to effectively adapt to external environmental factors such as temperature. There is an urgent need to develop an adaptive pressure regulation system for airtightness testing equipment that can not only respond to internal pressure changes, but also automatically adjust the pressure setting according to the internal and external temperature changes of the test object. Such a system will be able to more fully adapt to environmental conditions and improve the overall accuracy and reliability of airtightness testing, especially in areas with variable environmental conditions.

Summary of the invention

The purpose of this application is to overcome the shortcomings of the prior art and propose an adaptive pressure regulation system for airtightness testing equipment to solve the problem that the existing flow-type airtightness testing equipment cannot effectively compensate for the internal pressure changes caused by temperature fluctuations when facing temperature changes, thereby causing inaccurate calculations of leakage volume and leakage rate. This problem is particularly prominent in fast production environments and areas with significant temperature differences.

This application is implemented through the following technical solutions:

The present application proposes an adaptive pressure regulation system for airtightness testing equipment, which is used to detect the sealing performance of a test object under specified pressure and environmental conditions, including:

A closed chamber is used to contain the test object and maintain a constant temperature of the external environment of the test object;

A pressure applying device is connected to the detected object and inputs a required amount of gas into the detected object;

A first flow meter is connected to the detection object, and measures the gas inflow of the detection object in real time to obtain the gas inflow of the detection object;

A second flow meter is connected to the closed chamber to measure the gas outflow of the detected object in real time to obtain the gas outflow of the detected object;

The temperature sensor, whose probe is arranged inside the detection object, monitors the temperature inside the detection object in real time and obtains the temperature data inside the detection object;

A control unit, when the gas outflow of the detection object is greater than the gas inflow of the detection object, the control unit dynamically adjusts the required gas amount input by the pressure applying device to the detection object according to the internal temperature value of the detection object, the temperature value between the outside of the detection object and the inside of the closed chamber, the gas inflow of the detection object, and the gas outflow of the detection object, so as to compensate for the pressure change caused by the temperature change, and at the same time calculates the leakage amount and leakage rate through the influence on the gas volume.

In one embodiment of the present application, the control unit calculates the leakage amount according to the influence of the gas inflow of the detection object, the gas outflow of the detection object, the internal temperature value of the detection object, and the temperature value between the outside of the detection object and the inside of the closed chamber on the gas volume;

Define the internal temperature value of the detected object as Tdet, define the temperature value between the outside of the detected object and the inside of the closed chamber as Tenv, wherein Tdet and Tenv are both absolute temperatures, calculate and obtain the temperature correction coefficient as a, and the calculation formula is a=Tdet/Tenv;

Define the gas inflow of the detected object as Qin, calculate and obtain the inflow after temperature compensation Qin_c, the calculation formula is Qin_c = Qin*a;

Define the gas outflow of the detected object as Qout, calculate and obtain the outflow after temperature compensation Qout_c, and the calculation formula is Qout_c = Qout*a;

The gas leakage of the detected object is calculated as L, and the calculation formula is L=Qout_c-Qin_c.

In one embodiment of the present application, the control unit dynamically adjusts the amount of gas required for the pressure-applying device to input to the object to be detected according to the amount of gas leakage of the object to be detected, so as to compensate for the pressure change caused by the temperature change. The target pressure inside the object to be detected is preset as Ptarget, and the amount of gas required for the object to be detected is calculated as Qin_comp, Qin_comp>=Ptarget, and the calculation formula is Qin_comp=L*a;

The control unit dynamically adjusts the input gas volume Qin_comp to ensure that the internal pressure returns to the set target value Ptarget.

In one embodiment of the present application, the control unit dynamically adjusts the required gas amount input by the pressure applying device to the detection object according to the gas leakage amount of the detection object to compensate for the pressure change caused by the temperature change. The target pressure inside the detection object maintained at the current temperature is preset as Ptarget, the volume inside the detection object is defined as Vdet, the ideal gas constant R is defined, and the molar gas amount Ncomp that needs to be compensated is calculated.

The calculation formula is Ncomp = (Ptarget*Vdet)/(R*Tdet);

According to the leakage volume L and the required compensation gas volume Ncomp, the injected gas is controlled to maintain the target pressure. If the pressure inside the test object has dropped before compensation, the required gas volume for the test object is calculated as Qin_comp, and the calculation formula is Qin_comp = Ncomp*R*(Tdet/Vdet);

The control unit dynamically adjusts the input gas volume Qin_comp to compensate for the pressure changes caused by leakage and temperature, ensuring that the internal pressure returns to the set target value Ptarget.

In one embodiment of the present application, the total gas volume Vtotal is calculated and obtained, where Vtotal is the sum of the gas volume in the detection object and the gas volume between the outside of the detection object and the inside of the closed chamber, and the calculation formula is Vtotal=(Ptarget*Vdet)/(R*Tdet);

According to the leakage volume L and the required compensation gas volume Vtotal, the leakage rate Rleak is obtained, and the calculation formula is Rleak=L/Vtotal. The control unit dynamically adjusts the target pressure Ptarget according to the detected leakage rate Rleak.

In one embodiment of the present application, when the control unit detects that the leakage rate Rleak reaches a threshold value, the control unit automatically triggers an alarm system and generates a leakage report for reference by an operator.

In one embodiment of the present application, the control unit includes an adjustment module, which automatically adjusts the temperature correction coefficient a according to historical data and environmental change trends to improve the response speed and accuracy of the system under different temperature conditions.

In one embodiment of the present application, the control unit further includes a recording module, which continuously monitors and records a temperature value Tdet inside the detection object, a temperature value Tenv between the outside of the detection object and the inside of the closed chamber, a gas inflow Qin of the detection object, and a gas outflow Qout of the detection object, and stores them as historical data;

The adjustment module predicts the temperature change trend in the future based on the change trends of the internal temperature value Tdet of the detection object, the temperature value Tenv between the outside of the detection object and the inside of the closed chamber, the gas inflow Qin of the detection object, and the gas outflow Qout of the detection object in the historical data.

In one embodiment of the present application, the adjustment module calculates the actual use effect of the current temperature correction coefficient a, compares the currently calculated leakage amount L with the expected leakage amount, and evaluates the accuracy of the current correction coefficient;

If the error caused by the current temperature correction coefficient a exceeds the preset threshold, the control unit automatically adjusts the value of a according to the error amplitude, defines the difference between the actual leakage and the expected leakage as ΔL, defines the expected leakage as Lexpected, and obtains the updated correction coefficient a_new, which is calculated as follows:

a_new＝a*(1+ΔL/Lexpected), and the updated temperature correction coefficient a_new is used in the subsequent gas flow compensation and leakage rate calculation process to improve the response speed and accuracy of the system under different temperature conditions.

In one embodiment of the present application, the control unit further includes an early warning module, which analyzes historical data and current detection conditions based on the temperature correction coefficient a_new adjusted by the regulation module and the current leakage rate Rleak, and predicts the leakage trend that will occur in the future;

When an abnormal leakage trend is predicted, an early warning is automatically triggered and operators are advised to take measures in advance to repair or further detect to avoid serious leakage or system failure.

Compared with the prior art, the beneficial effects of this application are:

1. By introducing a control unit to dynamically adjust the temperature change, the pressure fluctuation caused by the temperature change can be compensated in time when the temperature inside and outside the test object changes. The control unit dynamically adjusts the output of the pressure application device according to the internal temperature value Tdet of the test object, the temperature value Tenv between the outside of the test object and the inside of the closed chamber, and the gas inflow Qin and gas outflow Qout of the test object. This system effectively avoids misjudgment caused by temperature changes and improves the accuracy and reliability of airtightness detection, especially in environments with large temperature fluctuations.

2. The system can maintain stable detection performance under various environmental conditions, especially in fast production environments and areas with significant temperature differences. By calculating the temperature correction coefficient a and dynamically adjusting the gas input of the pressure application device, the system can accurately calculate the leakage volume and leakage rate, and provide reliable detection results even when the temperature changes significantly. The control unit can accurately reflect the impact of gas volume changes on leakage volume and leakage rate through precise temperature compensation calculations. By calculating the temperature correction coefficient a and the compensated gas inflow Qin_c and outflow Qout_c through the formula, L=Qout_c-Qin_c, the system can accurately calculate the actual leakage volume L, avoiding misjudgment caused by temperature changes. This precise calculation makes the evaluation of leakage volume and leakage rate more reliable, and helps to improve the evaluation accuracy of the sealing performance of the detected object.

3. In order to cope with pressure fluctuations caused by leakage and temperature changes, the control unit calculates and dynamically adjusts the required compensation gas volume Qin_comp to ensure that the internal pressure returns to the set target value Ptarget. The dynamic pressure regulation mechanism enables the system to maintain a stable test pressure in a complex production environment, ensuring precise control of the internal pressure of the test object, thereby improving the accuracy and reliability of airtightness testing.

In addition, by calculating the total gas volume Vtotal, the system can quantify the gas volume in the entire detection environment. This total amount provides basic data for the subsequent leakage rate calculation, making the evaluation of the leakage situation more comprehensive and accurate. After obtaining the total gas volume Vtotal, calculate the leakage rate Rleak, and the calculation formula is: Rleak = L/Vtotal, L is the leakage volume. The leakage rate Rleak is used to evaluate the ratio of the leakage volume to the total gas volume of the system. By calculating the total gas volume Vtotal and the leakage rate Rleak, the system can dynamically adjust the target pressure Ptarget to ensure the effectiveness and accuracy of the air tightness detection.

4. The key detection data is comprehensively recorded and managed through the recording module and stored as historical data. The adjustment module can automatically adjust the temperature correction coefficient a according to historical data and environmental change trends, and respond to possible temperature changes in advance through trend analysis and prediction. The intelligent adjustment and prediction capabilities improve the response speed and detection accuracy of the system under different temperature conditions, and reduce the impact of temperature fluctuations on the detection results. The early warning module can predict future leakage trends based on the adjusted temperature correction coefficient a_new and the current leakage rate Rleak, and automatically trigger an early warning when an abnormal trend is detected. It provides operators with timely risk reminders and handling suggestions to avoid serious leakage or system failure.

Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures indicated in the description, claims and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

FIG1 is a schematic diagram of a flow chart of an adaptive pressure regulating system of an airtightness detection device provided in an embodiment of the present application;

FIG2 is a structural block diagram of an adaptive pressure regulation system of an airtightness detection device provided in an embodiment of the present application;

FIG3 is a structural block diagram of an adaptive pressure regulation system of an airtightness detection device provided in an embodiment of the present application.

Description of reference numerals:

100. Closed chamber; 200. Pressure applying device; 300. First flow meter; 400. Second flow meter; 500. Temperature sensor; 600. Control unit; 610. Adjustment module; 620. Recording module; 630. Early warning module.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of this application.

It should be noted that when an element is referred to as being "fixed on" or "set on" another component, it can be directly on the other component or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component.

In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

In order to illustrate the technical solution described in this application, a specific embodiment is provided below for illustration.

Please refer to Figures 1 to 3. The present application proposes an adaptive pressure regulating system for airtightness testing equipment, which can dynamically adjust the amount of gas input to the test object by the pressure applying device 200 according to the internal and external temperature changes of the test object to compensate for the pressure changes caused by temperature changes, thereby improving the accuracy and reliability of airtightness testing. The adaptive pressure regulating system for airtightness testing equipment includes a closed chamber 100, a pressure applying device 200, a first flowmeter 300, a second flowmeter 400 and a control unit 600. The closed chamber 100 is used to accommodate the test object and maintain a constant temperature of the external environment of the test object; the pressure applying device 200 is connected to the test object and inputs the required amount of gas to the test object; the first flowmeter 300 is connected to the test object to measure the gas inflow of the test object in real time to obtain the gas inflow of the test object; the second flowmeter 400 is connected to the closed chamber 100 to measure the gas outflow of the test object in real time to obtain the test object. The probe of the temperature sensor 500 is arranged inside the detected object to monitor the temperature of the internal space of the detected object in real time and obtain the temperature data inside the detected object; when the gas outflow of the detected object is greater than the gas inflow of the detected object, the control unit 600 dynamically adjusts the pressure applying device 200 to input the required gas amount to the detected object according to the internal temperature value of the detected object, the temperature value between the outside of the detected object and the inside of the closed chamber 100, the gas inflow of the detected object, and the gas outflow of the detected object to compensate for the pressure change caused by the temperature change, and at the same time calculates the leakage amount and leakage rate through the influence on the gas volume.

Specifically, the closed chamber 100 is used to accommodate the test object, and the constant temperature of the external environment of the test object is maintained by the control system, that is, the temperature value between the outside of the test object and the inside of the closed chamber 100, ensuring that the external temperature will not have an adverse effect on the sealing performance test results of the test object due to changes in the environment. The pressure applying device 200 is connected to the test object and is responsible for inputting the required amount of gas to the test object. The first flow meter 300 monitors the gas inflow of the test object in real time, and the second flow meter 400 monitors the gas outflow of the test object. The test object is placed in the closed chamber 100, and the probe of the temperature sensor 500 is arranged inside the test object to monitor the temperature of the internal space of the test object in real time. The control unit 600 is responsible for comprehensively analyzing the internal temperature value of the test object, the temperature value between the outside of the test object and the inside of the closed chamber 100, the gas inflow of the test object, and the gas outflow of the test object. When the gas outflow of the detection object is greater than the gas inflow, the control unit 600 dynamically adjusts the pressure applying device 200 to input the required amount of gas to the detection object based on these data to compensate for the pressure change caused by temperature change, and at the same time calculates the leakage amount and leakage rate through the impact on the gas volume.

It should be understood that existing flow-type detection equipment is usually equipped with a pressure regulating device, which can be adaptively adjusted to maintain a specific pressure inside the test object. This pressure regulating device automatically replenishes the required gas through a feedback control mechanism to compensate for the pressure drop caused by leakage. However, the pressure regulating device of the existing flow-type detection equipment is mainly designed to respond to the pressure changes inside the test object, with the purpose of maintaining the internal pressure stable to ensure the accuracy of the test results. However, these systems usually fail to fully consider the significant impact of external environmental factors, especially temperature changes on pressure. Temperature changes can cause significant changes in the volume and pressure of the gas. In an industrial environment with rapid and continuous production, the heat generated by the parts during the manufacturing process may cause their temperature to be higher than the ambient temperature. If the airtightness test is performed immediately when the temperature is not balanced, the test results may be misjudged due to gas expansion or contraction. In addition, in areas with large temperature differences between day and night, changes in ambient temperature can also significantly affect the calculation of the leakage rate.

In the present application, the control unit 600 can compensate in time when the temperature of the detected object changes by dynamically adjusting the gas input amount of the pressure applying device 200, thereby avoiding misjudgment caused by temperature changes. In addition, the control unit 600 can improve the calculation accuracy of the leakage amount and leakage rate by accurately calculating the gas volume change, thereby providing a more reliable airtightness detection result.

In one embodiment, the control unit 600 calculates the leakage amount according to the effect of the gas inflow of the detection object, the gas outflow of the detection object, the temperature value inside the detection object, and the temperature value between the outside of the detection object and the inside of the closed chamber 100 on the gas volume;

The internal temperature value of the detection object is defined as Tdet, and the temperature value between the outside of the detection object and the inside of the closed chamber 100 is defined as Tenv, wherein Tdet and Tenv are both absolute temperatures. The temperature correction coefficient is calculated and obtained as a, and the calculation formula is a=Tdet/Tenv; the gas inflow of the detection object is defined as Qin, and the inflow Qin_c after temperature compensation is calculated and obtained, and the calculation formula is Qin_c=Qin*a; the gas outflow of the detection object is defined as Qout, and the outflow Qout_c after temperature compensation is calculated and obtained, and the calculation formula is Qout_c=Qout*a; the gas leakage of the detection object is calculated as L, and the calculation formula is L=Qout_c-Qin_c.

Specifically, first, define the internal temperature value of the detected object as Tdet and the temperature value between the outside of the detected object and the inside of the closed chamber 100 as Tenv. Both temperature values are absolute temperatures, that is, in Kelvin. Then, the temperature correction coefficient a can be calculated by the formula a=Tdet/Tenv. The temperature correction coefficient a is used to correct the change in gas volume caused by temperature differences, ensuring that the calculation of gas inflow and outflow under different temperature conditions can reflect the actual leakage situation. Through this correction, the error caused by the difference in temperature between the internal temperature of the temperature detection unit and the external temperature of the detected object is avoided, thereby improving the accuracy of the leakage calculation.

Next, define the gas inflow of the detection object as Qin, and use the temperature correction coefficient a to compensate. The temperature-compensated inflow Qin_c can be calculated using the formula Qin_c=Qin*a. Similarly, define the gas outflow of the detection object as Qout, and perform the same compensation. The temperature-compensated outflow Qout_c can be calculated using the formula Qout_c=Qout*a. By combining the gas flow rate with the temperature correction coefficient, the effect of temperature changes on the gas volume can be accurately reflected, allowing the system to accurately correct the gas flow rate under different temperature conditions, reducing the impact of temperature fluctuations on detection accuracy and ensuring the accuracy of leakage calculations.

Finally, based on the temperature-compensated inflow and outflow, the actual gas leakage L is calculated by the formula L = Qout_c-Qin_c, which is the difference between the gas outflow and the inflow. This calculation has taken temperature compensation into account, and the leakage L obtained can more accurately reflect the actual leakage situation and avoid misjudgment caused by temperature changes.

In summary, whether in a fast production environment (such as when the test object has just been produced and the temperature is high) or in an area with significant temperature differences (such as areas with large temperature differences between day and night), this technical solution can adaptively adjust the calculation parameters to ensure the accuracy of airtightness testing. This enables the system to provide reliable test results under various environmental conditions. Through calculations after temperature compensation, the problem of misjudgment caused by temperature changes is reduced, avoiding incorrect leakage judgments.

In one embodiment, the control unit 600 dynamically adjusts the amount of gas required to be input to the detection object by the pressure applying device 200 according to the amount of gas leakage of the detection object to compensate for the pressure change caused by the temperature change. The target pressure inside the detection object is preset to be Ptarget, and the amount of gas required to be input to the detection object is calculated to be Qin_comp, Qin_comp>=Ptarget, and the calculation formula is Qin_comp=L*a; the control unit 600 dynamically adjusts the input gas amount Qin_comp to ensure that the internal pressure returns to the set target value Ptarget.

Specifically, in order to compensate for the pressure drop caused by leakage and cope with the influence of temperature change, the control unit 600 calculates the required compensation gas volume Qin_comp through the formula Qin_comp＝L*a, Qin_comp>＝Ptarget to ensure that the internal pressure returns to the set target value Ptarget. The temperature correction coefficient a is used to adjust the volume or pressure difference caused by temperature change. The required compensation gas volume Qin_comp is obtained by calculation. The control unit 600 dynamically adjusts the output of the pressure applying device 200 so that the gas input volume matches the leakage volume and temperature change, and finally ensures that the internal pressure of the test object is maintained at the set target value Ptarget.

In another embodiment, the control unit 600 dynamically adjusts the required amount of gas input to the detection object by the pressure applying device 200 according to the gas leakage amount of the detection object to compensate for the pressure change caused by the temperature change. The target pressure inside the detection object maintained at the current temperature is preset as Ptarget, the volume inside the detection object is defined as Vdet, the ideal gas constant R is defined, and the molar amount of gas Ncomp required to be compensated is calculated, and the calculation formula is Ncomp = (Ptarget*Vdet)/(R*Tdet); according to the leakage amount L and the required compensation gas amount Ncomp, the injected gas is controlled to maintain the target pressure. If the pressure inside the detection object has dropped before compensation, the required amount of gas input to the detection object is calculated as Qin_comp, and the calculation formula is Qin_comp = Ncomp*R*(Tdet/Vdet); the control unit 600 dynamically adjusts the input gas amount Qin_comp to compensate for the pressure change caused by leakage and temperature, and ensures that the internal pressure returns to the set target value Ptarget.

Specifically, the control unit 600 not only makes adjustments according to the leakage volume L, but also accurately controls the gas input volume by calculating the required molar gas amount Ncomp to be compensated, ensuring that the pressure inside the detection object is maintained at the target pressure Ptarget. First, define the volume Vdet inside the detection object and the ideal gas constant R. According to the target pressure Ptarge and the internal temperature Tdet inside the detection object, the molar gas amount Ncomp to be compensated is calculated, and the calculation formula is: Ncomp = (Ptarget*Vdet)/(R*Tdet). By calculating the molar number of the compensation gas Ncomp, the system can accurately determine the amount of gas that needs to be supplemented inside the detection object at the target pressure and temperature. The calculation is based on the ideal gas law, which ensures the accuracy of the compensation gas and helps to maintain stable detection conditions.

After calculating the number of gas moles Ncomp that needs to be compensated, the control unit 600 also needs to adjust the gas input Qin_comp according to actual conditions (such as leakage and temperature changes). If the pressure inside the test object has dropped before compensation, the required input gas volume is calculated, and the calculation formula is: Qin_comp = Ncomp*R*(Tdet/Vdet). The control unit 600 dynamically adjusts the input gas volume Qin_comp to compensate for the pressure changes caused by leakage and temperature, ensuring that the input gas volume can accurately compensate for the pressure drop caused by leakage and temperature changes, thereby maintaining the pressure inside the test object at the target value Ptarget.

In summary, by dynamically adjusting the gas input and precise pressure control, the system can maintain a stable test pressure under various complex environmental conditions, achieving precise control of the internal pressure of the test object. By combining the ideal gas law and real-time calculation, the system can quickly restore and maintain the target pressure when the temperature and leakage conditions change, significantly improving the accuracy and reliability of airtightness testing.

It should be noted that although the above two technical solutions can calculate the required gas input Qin_comp for compensation, and dynamically adjust the gas input through the control unit 600 to ensure that the internal pressure of the detected object returns to the set target value Ptarget, their calculation methods and application scenarios are different. In the calculation formula Qin_comp = L*a, the calculation of Qin_comp is directly based on the leakage L and the temperature correction coefficient a. The leakage L here is the difference between the outflow and the inflow obtained by monitoring the flowmeter, and is calculated after temperature correction. This solution mainly focuses on how to quickly perform temperature compensation based on the existing leakage to ensure that the gas input can be dynamically adjusted to maintain the target pressure. This calculation method is concise and direct, and is suitable for uses where the leakage is known and quick compensation is required. It is a quick and easy compensation adjustment for known leaks, and is suitable for use in fast-response detection systems.

Another calculation formula is Ncomp = (Ptarget*Vdet)/(R*Tdet). After obtaining Ncomp, Qin_comp = Ncomp*R*(Tdet/Vdet). This calculation process is more complicated. In addition to compensation based on the leakage volume L, it is also necessary to calculate the number of moles of gas Ncomp inside the test object to more accurately control the gas input volume. This method is based on the ideal gas law. After calculating the number of moles Ncomp required for compensation, the required gas input volume Qin_comp is further calculated to accurately maintain the target pressure inside the test object. This calculation method is suitable for scenarios that require higher precision pressure control, especially under conditions of significant temperature changes or complex leaks. It can fully and accurately control the gas state inside the test object, so it is more suitable for detection environments with high precision requirements.

In one embodiment, the total gas volume Vtotal is calculated and obtained, where Vtotal is the sum of the gas volume in the detection object plus the gas volume between the outside of the detection object and the inside of the closed chamber 100, and the calculation formula is Vtotal = (Ptarget*Vdet)/(R*Tdet); according to the leakage volume L and the required compensation gas volume Vtotal, the leakage rate Rleak is obtained, and the calculation formula is Rleak = L/Vtotal, and the control unit 600 dynamically adjusts the target pressure Ptarget according to the detected leakage rate Rleak.

Specifically, first, define the total gas volume Vtotal, which is the sum of the gas volume inside the test object and the gas volume outside the test object (inside the closed chamber 100). The calculation formula is: Vtotal = (Ptarget*Vdet)/(R*Tdet), Vdet is the volume inside the test object, R is the ideal gas constant, Tdet is the absolute temperature inside the test object, and Ptarget is the target pressure to be maintained. By calculating the total gas volume Vtotal, the system can quantify the gas volume in the entire test environment. This total amount provides basic data for subsequent leakage rate calculations, making the evaluation of leakage conditions more comprehensive and accurate. After obtaining the total gas volume Vtotal, calculate the leakage rate Rleak, and the calculation formula is: Rleak = L/Vtotal, L is the leakage volume, which represents the actual gas leakage volume in the test object under specific conditions. The leakage rate Rleak is used to evaluate the ratio of the leakage volume to the total gas volume of the system. Through quantitative evaluation, the system can more accurately reflect the severity of the leakage, thereby improving the evaluation accuracy of the sealing performance of the test object.

The leakage rate Rleak is expressed as the ratio of the leakage volume to the total gas volume. If the leakage rate Rleak is low, such as lower than the preset threshold, it means that the air tightness of the system is good and the leakage volume can be ignored relative to the total gas volume. If the leakage rate Rleak is high, such as lower than the preset threshold, it means that there is a significant leakage in the system and it may need to be repaired or redesigned. The control unit 600 dynamically adjusts the target pressure Ptarget according to the detected leakage rate Rleak. Specifically, when the leakage rate exceeds a preset threshold, the control unit 600 may lower the target pressure to reduce the impact of the leakage on the overall performance of the system, or in some cases may increase the target pressure to enhance the rigor of the sealing test. This mechanism of dynamically adjusting the target pressure enables the system to flexibly respond to different leakage conditions and improves the adaptability and flexibility of the detection. Adjusting the target pressure according to the leakage rate helps to optimize the test conditions when a leak occurs, thereby improving the effectiveness and accuracy of the detection.

In one embodiment, when the control unit 600 detects that the leakage rate Rleak reaches a threshold, it automatically triggers an alarm system and generates a leakage report for reference by an operator.

Specifically, the monitoring and threshold setting of the leakage rate Rleak, the control unit 600 continuously monitors the leakage rate Rleak, and when the leakage rate Rleak reaches or exceeds the preset threshold (the threshold can be set according to the specific application scenario and safety requirements), the system automatically enters the alarm state. By setting the threshold of the leakage rate, the system can issue a warning in time when the leakage condition reaches a dangerous or attention-requiring level. The alarm system can remind the operator in a variety of ways, such as sound and light alarms, information display, or sending alarm information through the network. In addition to triggering the alarm, the system also generates a detailed leakage report. The report content includes but is not limited to key information such as the leakage rate Rleak, the total gas volume Vtotal, the leakage volume L, temperature conditions, and the target pressure Ptarget.

In one embodiment, the control unit 600 includes an adjustment module 610, which automatically adjusts the temperature correction coefficient a according to historical data and environmental change trends to improve the response speed and accuracy of the system under different temperature conditions.

In one embodiment, the control unit 600 also includes a recording module 620, which continuously monitors and records the internal temperature value Tdet of the detection object, the temperature value Tenv between the outside of the detection object and the inside of the closed chamber 100, the gas inflow Qin of the detection object, and the gas outflow Qout of the detection object, and stores them as historical data; the adjustment module 610 predicts the temperature change trend in the future period of time based on the change trends of the internal temperature value Tdet of the detection object, the temperature value Tenv between the outside of the detection object and the inside of the closed chamber 100, the gas inflow Qin of the detection object, and the gas outflow Qout of the detection object in the historical data.

Specifically, the adjustment module 610 is used to analyze and utilize historical data, and automatically adjust the temperature correction coefficient a in combination with the current environmental change trend. The recording module 620 is responsible for continuously monitoring and recording key parameters related to airtightness detection. The internal temperature value Tdet of the detection object monitors the temperature change inside the detection object in real time; the temperature value Tenv between the outside of the detection object and the inside of the closed chamber 100 monitors the temperature outside the detection object and inside the closed chamber 100 to reflect the change of ambient temperature; the gas inflow Qin of the detection object monitors the gas flow entering the detection object; the gas outflow Qout of the detection object monitors the gas flow out of the detection object. These data will be continuously recorded and stored as historical data for subsequent analysis. The historical data includes the past internal temperature value Tdet of the detection object, the temperature value Tenv between the outside of the detection object and the inside of the closed chamber 100, the gas inflow Qin of the detection object, the gas outflow Qout of the detection object, the leakage L of the detection object, the leakage rate Rleak of the detection object and other data. The adjustment module 610 uses the historical data stored in the recording module 620 to perform detailed trend analysis. By analyzing the change trend in the historical data, the adjustment module 610 can predict the temperature change trend in the future period of time.

Temperature trend analysis: By analyzing the time series of Tdet and Tenv data, the regulation module 610 can predict the temperature trend, such as whether the temperature will continue to rise or fall.

Flow trend analysis: By analyzing the gas inflow Qin and outflow Qout, the system can predict the changing trend of gas flow and further infer the possible leakage trend.

Based on the above prediction, the adjustment module 610 can adjust the temperature correction coefficient a in advance to ensure that the system is ready before the temperature change occurs, thereby improving the response speed and detection accuracy of the system under different temperature conditions. By using historical data for trend analysis and prediction, the system can better predict future environmental changes and actively adjust detection parameters.

In one embodiment, the adjustment module 610 calculates the actual use effect of the current temperature correction coefficient a, compares the currently calculated leakage amount L with the expected leakage amount, and evaluates the accuracy of the current correction coefficient; if the error generated by the current temperature correction coefficient a exceeds the preset threshold, the control unit 600 automatically adjusts the value of a according to the error amplitude, defines the difference between the actual leakage amount and the expected leakage amount as ΔL, defines the expected leakage amount as Lexpected, and obtains the updated correction coefficient a_new, and the calculation formula is: a_new = a*(1+ΔL/Lexpected). The updated temperature correction coefficient a_new is used in the subsequent gas flow compensation and leakage rate calculation process to improve the response speed and accuracy of the system under different temperature conditions.

Specifically, the adjustment module 610 calculates the actual use effect of the current temperature correction coefficient a. By comparing the currently calculated leakage L with the leakage Lexpected expected by the system under ideal conditions, the system can determine the accuracy of the current temperature correction coefficient a. If the difference between the leakage caused by the current correction coefficient and the expected leakage is large, the current correction coefficient needs to be adjusted. When it is found that the error generated by the current temperature correction coefficient a exceeds the preset threshold, the adjustment module 610 will automatically adjust the correction coefficient. The error is defined as the difference ΔL between the actual leakage L and the expected leakage Lexpected. The system calculates the updated correction coefficient a_new by the following formula, a_new = a*(1+ΔL/Lexpected), and the updated correction coefficient a_new will be used for subsequent gas flow compensation and leakage rate calculation to improve the response speed and accuracy of the system under different temperature conditions. The updated temperature correction coefficient a_new will be immediately applied to the subsequent detection process to compensate for gas flow and calculate leakage rate. The system will continue to monitor and evaluate the effect of the new correction coefficient to ensure that the detection accuracy is continuously optimized as the environment changes. This dynamic adjustment and application mechanism ensures that the system can continuously optimize itself as the environment changes, and always maintain high-precision airtightness detection capabilities. It is very suitable for occasions with large temperature fluctuations or frequent environmental changes.

In one embodiment, the control unit 600 also includes an early warning module 630. The early warning module 630 analyzes historical data and current detection conditions based on the temperature correction coefficient a_new adjusted by the adjustment module 610 and the current leakage rate Rleak, and predicts future leakage trends. When an abnormal leakage trend is predicted, an early warning is automatically triggered and the operator is advised to take measures in advance to repair or further detect, so as to avoid serious leakage or system failure.

Specifically, the early warning module 630 performs an in-depth analysis based on the temperature correction coefficient a_new and the current leakage rate Rleak adjusted by the adjustment module 610. By comparing these current detection data with historical data, the early warning module 630 can identify potential risk trends. The analysis of historical data includes a time series analysis of temperature changes, gas flow changes, and leakage conditions during past detection processes. Through this analysis, the early warning module 630 can identify leakage patterns that may occur under similar conditions and predict the leakage trends that may occur in the current detection object in a certain period of time in the future. When the early warning module 630 analyzes an abnormal leakage trend, such as finding that the leakage rate Rleak increases sharply in a short period of time or the temperature correction coefficient ane changes abnormally, the system will automatically trigger an early warning. The early warning module 630 will trigger the alarm system according to preset conditions and generate an early warning report. The report content includes the changing trend of the leakage rate, the adjustment of the temperature correction coefficient, the comparison results of historical data, etc.

The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

In the embodiments provided in the present application, it should be understood that the disclosed devices/terminal equipment and methods can be implemented in other ways. For example, the device/terminal equipment embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

If the integrated module/unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the process in the above-mentioned embodiment method, and can also be completed by hardware related to computer program instructions. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electric carrier signals and telecommunication signals.

The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims (10)

1. An adaptive pressure regulating system for an air tightness detection device for detecting the sealing performance of a test object under prescribed pressure and environmental conditions, comprising:

A closed chamber for accommodating the detection object and maintaining a constant temperature of an external environment of the detection object;

The pressure applying device is communicated with the detection device and inputs the required gas quantity to the detection object;

The first flowmeter is connected with the detection object and used for measuring the gas inflow of the detection object in real time to obtain the gas inflow of the detection object;

the second flowmeter is connected with the closed chamber and is used for measuring the gas outflow of the detection object in real time to obtain the gas outflow of the detection object;

the probe of the temperature sensor is arranged in the detection object, and monitors the temperature of the internal space of the detection object in real time to obtain temperature data in the detection object;

And a control unit for dynamically adjusting the amount of gas required for the pressure applying device to be input to the detection object to compensate for pressure change caused by temperature change according to the temperature value inside the detection object, the temperature value between the outside of the detection object and the inside of the closed chamber, the gas inflow of the detection object and the gas outflow of the detection object when the gas outflow of the detection object is larger than the gas inflow of the detection object, and calculating the leakage amount and the leakage rate according to the influence on the gas volume.

2. The adaptive pressure regulating system of an airtight inspection apparatus according to claim 1, wherein said control unit calculates a leakage amount based on an inflow amount of gas of the inspection object, an outflow amount of gas of the inspection object, an inside temperature value of the inspection object, and a temperature value between an outside of the inspection object and an inside of said closed chamber, an influence on a gas volume;

Defining the temperature value inside the detected object as Tdet, defining the temperature value between the outside of the detected object and the inside of the closed chamber as Tenv, wherein Tdet and Tenv are absolute temperatures, calculating and obtaining a temperature correction coefficient as a, and the calculation formula is a=Tdet/Tenv;

Defining the inflow of the gas of the detection object as Qin, and calculating and obtaining the inflow qin_c after temperature compensation, wherein the calculation formula is qin_c=qin×a;

Defining the gas outflow quantity of the detected object as Qout, and calculating and obtaining the temperature compensated outflow quantity Qout_c, wherein the calculation formula is Qout_c=Qout x a;

the detected gas leakage amount is calculated as L, and the calculation formula is l=qout_c-qin_c.

3. The adaptive pressure regulating system of the airtight detecting apparatus according to claim 2, wherein the control unit dynamically adjusts the amount of gas required for the input of the pressure applying device to the detected object in accordance with the detected object gas leakage amount to compensate for the pressure change caused by the temperature change, presets maintaining the target pressure inside the detected object as Ptarget, calculates the amount of gas required for the input to the detected object as qin_comp, qin_comp > = Ptarget, and calculates the calculation formula as qin_comp = L;

the control unit dynamically adjusts the input gas quantity qin_comp to ensure that the internal pressure returns to the set target value Ptarget.

4. The adaptive pressure regulating system of the airtight detecting apparatus according to claim 2, wherein said control unit dynamically adjusts the amount of gas required for the input of said pressure applying means to the detected object in accordance with the amount of gas leakage of the detected object to compensate for the pressure variation caused by the temperature variation, presets maintaining the target pressure inside the detected object at the current temperature as Ptarget, defines the volume inside the detected object as Vdet, defines an ideal gas constant R, calculates the amount of gas Ncomp to be compensated for,

The calculation formula is ncomp= (Ptarget x Vdet)/(R x Tdet);

Controlling the injected gas to maintain the target pressure according to the leakage L and the required compensation gas Ncomp, and calculating to obtain the gas quantity required for inputting the detection object to be Qin_comp if the pressure in the detection object is reduced before compensation, wherein the calculation formula is Qin_comp=Ncomp R (Tdet/Vdet);

The control unit dynamically adjusts the input gas quantity qin_comp to compensate for leakage and temperature-induced pressure changes, ensuring that the internal pressure returns to the set target value Ptarget.

5. The adaptive pressure regulating system of an airtight inspection apparatus according to claim 4, wherein the total gas amount Vtotal is calculated and obtained, wherein Vtotal is the sum of the gas amount in the inspection object plus the gas amount between the outside of the inspection object and the inside of the closed chamber, and wherein the calculation formula is vtotal= (Ptarget x Vdet)/(R x Tdet);

according to the leakage L and the required compensation gas Vtotal, the leakage rate Rleak is obtained, the calculation formula is Rleak =L/Vtotal, and the control unit dynamically adjusts the target pressure Ptarget according to the detected leakage rate Rleak.

6. The adaptive pressure regulating system of an air tightness detection apparatus according to claim 5, wherein the control unit automatically triggers an alarm system when detecting that the leak rate Rleak reaches a threshold value and generates a leak report for reference by an operator.

7. The adaptive pressure regulating system of the air tightness detection apparatus according to claim 2, wherein the control unit comprises a regulating module that automatically adjusts the temperature correction coefficient a according to historical data and environmental change trends to improve the response speed and accuracy of the system under different temperature conditions.

8. The adaptive pressure regulating system of an air tightness detection apparatus according to claim 7, wherein the control unit further comprises a recording module that continuously monitors and records a temperature value Tdet inside the test object, a temperature value Tenv between the outside of the test object and the inside of the closed chamber, a gas inflow Qin of the test object, and a gas outflow Qout of the test object, and stores as history data;

The regulating module predicts the temperature change trend in a future period according to the change trend of the temperature value Tdet inside the detected object, the temperature value Tenv between the outside of the detected object and the inside of the closed chamber, the gas inflow Qin of the detected object and the gas outflow Qout of the detected object in the historical data.

9. The adaptive pressure regulating system of the air tightness detecting apparatus according to claim 8, wherein the regulating module calculates an actual use effect of the current temperature correction coefficient a, compares the current calculated leakage amount L with an expected leakage amount, and evaluates accuracy of the current correction coefficient;

if the error generated by the current temperature correction coefficient a exceeds a preset threshold value, the control unit automatically adjusts the value of a according to the error amplitude, defines the difference between the actual leakage quantity and the expected leakage quantity as delta L, defines the expected leakage quantity as Lexpected, and acquires an updated correction coefficient a_new, wherein the calculation formula is as follows:

a_new=a (1+Δl/Lexpected), and the updated temperature correction coefficient a_new is used in the subsequent gas flow compensation and leakage rate calculation process, so as to improve the response speed and accuracy of the system under different temperature conditions.

10. The adaptive pressure regulating system of the air tightness detection device according to claim 9, wherein the control unit further comprises an early warning module, wherein the early warning module predicts a future occurrence of leakage trend based on the temperature correction coefficient a_new and the current leakage rate Rleak adjusted by the adjusting module, analyzing historical data and current detection conditions;

when the abnormal leakage trend is predicted, the early warning is automatically triggered and an operator is recommended to take measures in advance to repair or further detect, so that serious leakage or system failure is avoided.