CN115524083A - Evaluation device, method and applicability judgment method of globe valve sealing performance - Google Patents

Abstract

The invention provides a device and a method for evaluating the sealing performance of a stop valve and an application judgment method, and relates to the technical field of fuel cell application. The device for evaluating the sealing performance of the stop valve comprises a movable sealing cavity, an air pressure adjusting device, an air pressure monitoring device and a control device. The sealed cavity is provided with an air port for air inlet or air outlet; the gas port is used for assembling the stop valve. The air pressure adjusting device is used for filling or extracting air into or out of the sealing cavity so as to adjust the air pressure in the sealing cavity. The air pressure monitoring device is used for monitoring the air pressure in the sealed cavity. The air pressure monitoring device and the air pressure adjusting device are electrically connected with the control device. The control device can evaluate the sealing performance of the stop valve according to the change condition of the air pressure in the sealing cavity. The stop valve sealing performance evaluation method and the application judgment method provided by the invention are both applied to the stop valve sealing performance evaluation device. The device and the method for evaluating the sealing performance of the stop valve and the applicable judgment method provided by the invention can solve the problem that the stop valve cannot be accurately evaluated and judged.

Description

Evaluation device, method and applicability judgment method of globe valve sealing performance

technical field

The invention relates to the technical field of fuel cell applications, in particular to a shut-off valve sealing performance evaluation device, method and applicability judgment method.

Background technique

After the fuel cell system is shut down for a long time, if the cathode is not reliably sealed, the air will gradually penetrate through the cathode and enter the anode through the proton membrane, resulting in the formation of a hydrogen-air interface at the anode after the next startup, resulting in a high overpotential and degradation of the proton membrane. Catalyst carbon support, resulting in the loss of catalyst, resulting in the decline of stack performance and durability. In order to avoid this situation, it is necessary to seal the cathode circuit of the fuel cell system to prevent the entry of air, and at the same time consume the residual oxygen in the cathode before shutting down to form an oxygen-free environment. The sealing shut-off valve is a key part to realize the sealing of the cathode of the stack, and is usually installed at the place where the cathode enters the stack and exits the stack.

The common sealing stop valve is improved from the electronic throttle valve design, and the sealing test after the valve plate is fully closed is usually carried out on the test bench at room temperature and negative pressure. That is, use a vacuum pump to reduce the pressure to a certain target pressure lower than atmospheric pressure and maintain it for a short period of time, and calculate the leakage value of the stop valve under a certain pressure difference through the reading of the flow meter. This test equipment is a fixed equipment with a large volume and cannot be moved, and the test medium is air at normal temperature; thus, the existing test equipment can only test the globe valve in a single environment. However, the working environment of the shut-off valve in the fuel cell system is high temperature, and the shut-off valve tested only with the above test equipment cannot judge whether it can meet the applicable requirements of the fuel cell system. In other words, the existing test equipment cannot Accurately evaluate and judge the shut-off valve of the fuel cell system, and then cannot accurately judge whether the shut-off valve is suitable for the fuel cell system applied to the specified power consumption system.

Contents of the invention

The purpose of the present invention is to provide a shut-off valve sealing performance evaluation device, which can improve the technical problem that the shut-off valve cannot be accurately evaluated and judged in the prior art.

The purpose of the present invention is also to provide a method for evaluating the tightness of a cut-off valve, which can improve the technical problem in the prior art that the cut-off valve cannot be accurately evaluated and judged.

The purpose of the present invention is also to provide a method for judging the suitability of the shut-off valve sealing performance, which can improve the fuel cell system in the prior art that cannot accurately judge whether the shut-off valve is suitable for a specified power consumption system.

Embodiments of the present invention can be realized like this:

An embodiment of the present invention provides a shut-off valve tightness evaluation device for evaluating the tightness of a shut-off valve used in a fuel cell system. The shut-off valve tightness evaluation device includes:

A movable sealed chamber has an air port for air intake or air outlet; the air port is used to assemble the shut-off valve;

An air pressure regulating device, connected to the sealed cavity, for filling or extracting gas into the sealed cavity to adjust the air pressure in the sealed cavity;

an air pressure monitoring device connected to the sealed chamber to monitor the air pressure inside the sealed chamber; and,

A control device, the air pressure monitoring device and the air pressure adjustment device are electrically connected to the control device; the control device is used to control the air pressure adjustment device to adjust the air pressure of the sealed cavity; the control device is used to obtain The air pressure in the sealed cavity monitored by the air pressure monitoring device; when the shut-off valve is closed and the air pressure regulating device is shut down, the control device is also used to record the change of the air pressure in the sealed cavity, based on The changes evaluate the tightness of the shut-off valve.

Compared with the prior art, the beneficial effects of the shut-off valve tightness evaluation device provided by the present invention include:

When judging the tightness of the shut-off valve applied to the fuel cell system, the shut-off valve is fitted to the gas port of the sealed chamber. In this case, the sealed chamber can be moved to any environment, for example, the sealed chamber can be moved to a high-temperature or high-pressure environment, so that the working conditions of the shut-off valve in a high-temperature or high-pressure environment can be simulated; and the sealed chamber can also be moved to any designated environment for the test of the shut-off valve according to actual needs, meeting the requirements of the fuel cell system. Applicable requirements, in other words, can accurately evaluate and judge the cut-off valve of the fuel cell system, so as to improve the technical problem that the cut-off valve cannot be accurately evaluated and judged in the prior art.

Optionally, the shut-off valve tightness evaluation device also includes an opening controller, the opening controller is electrically connected to the shut-off valve and to the control device; the control device is also used to pass The opening controller controls the cut-off valve to adjust the opening.

The cut-off valve can be controlled to increase or decrease repeatedly through the opening controller, and the durability test of the cut-off valve can be carried out to facilitate the simulation of the working condition of the cut-off valve after a long time of use, that is, the cut-off valve can be tested after a long time of use. To evaluate and judge the tightness of the stop valve comprehensively.

Optionally, the shut-off valve tightness evaluation device also includes a temperature-adjustable thermostat, the thermostat is electrically connected to the control device, and the control device is used to adjust the temperature inside the thermostat. The sealed chamber is arranged inside the incubator.

Setting the sealing chamber inside the incubator can directly adjust the temperature inside the incubator to achieve the purpose of adjusting the application environment of the globe valve, thereby meeting the needs of evaluating the sealing performance of the globe valve in different temperature environments and improving the accuracy of the globe valve. The accuracy of valve evaluation.

Optionally, the shut-off valve tightness evaluation device also includes a temperature monitoring device, which is connected to the sealed cavity and used to detect the temperature inside the sealed cavity; the temperature monitoring device is connected to the sealed cavity. The control device is electrically connected, and the control device is used to obtain the temperature monitored by the temperature monitoring device.

The temperature inside the sealed chamber is monitored by the temperature monitoring device, so that when the temperature of the environment in which the sealed chamber is adjusted through the thermostat, the sealing performance evaluation test of the stop valve can be performed after the internal temperature of the sealed chamber is stabilized to prevent the inside of the sealed chamber from Temperature changes lead to large errors in the tightness test of the globe valve, thereby ensuring the accuracy of the tightness test of the globe valve.

Optionally, the air pressure regulating device includes a regulating pump and a hand valve; the regulating pump is connected to the sealed chamber through a communication pipe, so as to fill or extract gas into the sealed chamber through the communicating pipe; The hand valve is arranged on the communicating pipe and is used to close or open the communicating pipe.

When adjusting the air pressure inside the sealed chamber, open the hand valve, and adjust the pump to charge or extract gas into the sealed chamber to adjust the air pressure inside the sealed chamber. When the air pressure inside the sealing chamber reaches the specified air pressure, closing the hand valve can complete the sealing of the sealing chamber, prevent the gas in the sealing chamber from leaking from the connecting pipe, and prevent the impact on the sealing evaluation of the globe valve.

A method for evaluating the tightness of a cut-off valve, applied to the above-mentioned device for evaluating the tightness of a cut-off valve, the method for evaluating the tightness of a cut-off valve includes:

Adjusting the air pressure in the sealed cavity to a first preset air pressure, and closing the stop valve mounted on the air port; the first preset air pressure is less than atmospheric pressure;

Recording the time taken for the air pressure in the sealed cavity to rise from the first preset air pressure to atmospheric pressure to obtain a time value;

The tightness of the shut-off valve is evaluated based on the time value.

The shut-off valve tightness evaluation method provided by the present invention is applied to the above-mentioned shut-off valve tightness evaluation device. The beneficial effects of the technology are the same and will not be repeated here.

Optionally, the shut-off valve tightness evaluation device also includes an opening controller, the opening controller is electrically connected to the shut-off valve and to the control device; the control device is also used to pass The opening controller controls the cut-off valve to adjust the opening;

Before the step of adjusting the air pressure in the sealed cavity to the first preset air pressure and closing the shut-off valve assembled at the air port, the method for evaluating the tightness of the shut-off valve further includes:

controlling the opening controller to adjust the opening of the stop valve to gradually increase until the opening of the stop valve reaches a maximum;

After the opening of the stop valve reaches the maximum and lasts for a first preset time, controlling the opening controller to adjust the opening of the stop valve to gradually decrease until the stop valve is closed;

After the shut-off valve is closed and lasts for a second preset time, return to the step of controlling the opening controller to adjust the opening of the shut-off valve to gradually increase until the opening of the shut-off valve reaches a maximum, until The number of opening or closing times of the cut-off valve reaches a first preset number of times.

Before evaluating the tightness of the cut-off valve, the opening of the cut-off valve is controlled by the opening controller to increase and decrease repeatedly, and the durability test of the cut-off valve can be carried out to facilitate the simulation of the work of the cut-off valve after long-term use The situation, that is, the sealing performance of the shut-off valve after long-term use can be evaluated and judged, so as to comprehensively evaluate and judge the tightness of the shut-off valve.

Optionally, the shut-off valve tightness evaluation device also includes a temperature-adjustable thermostat, the thermostat is electrically connected to the control device, and the control device is used to adjust the temperature inside the thermostat. The sealed chamber is located inside the incubator;

Before adjusting the air pressure in the sealed cavity to a first preset air pressure and closing the stop valve; before the step of the first preset air pressure being less than atmospheric pressure, the method for evaluating the sealing performance of the stop valve further includes:

controlling the internal temperature of the incubator to reach a preset temperature value.

By controlling the temperature inside the incubator to adjust to the preset temperature value, the sealed chamber can be in the environment of the preset temperature value, and then simulate the working condition of the cut-off valve in the environment of the preset temperature value, so as to facilitate the adjustment of the cut-off valve according to the actual situation. The valve sealing evaluation environment is adjusted to achieve the purpose of improving the evaluation accuracy.

A method for judging the suitability of the shut-off valve tightness, which is applied to the above-mentioned shut-off valve tightness evaluation device, and is used to judge whether the shut-off valve is applicable to a fuel cell system applied to a designated power consumption system, and the shut-off valve tightness Applicable judgment methods include:

adjusting the air pressure in the sealed cavity to a second preset air pressure, and closing the shut-off valve mounted on the air port;

Recording the time taken for the air pressure in the sealed chamber to rise from the second preset air pressure to the third preset air pressure to obtain a time value;

calculating the leakage rate of the stop valve according to the second preset air pressure, the third preset air pressure and the time value;

If the leakage rate is less than the leakage standard rate of the fuel cell system applied to the designated power consumption system, the stop valve can be applied to the fuel cell system applied to the designated power consumption system.

The leakage rate of the shut-off valve is calculated by the shut-off valve sealing evaluation device, and then according to the comparison result of the leak rate and the leakage standard rate of the fuel cell system applied to the specified power consumption system, it is judged whether the shut-off valve can be applied to the fuel The battery system can quickly complete the judgment of the applicability of the stop valve to meet the actual needs of users.

Optionally, the step of calculating the leakage rate of the stop valve according to the second preset air pressure, the third preset air pressure and the time value includes:

The leakage rate is obtained by dividing the difference between the second preset air pressure and the third preset air pressure by the time value.

By recording the time value for the sealing chamber to rise from the second preset air pressure to the third preset air pressure, and then calculating the change rate of the air pressure in the sealing chamber, the leakage rate of the shut-off valve can be obtained.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

FIG. 1 is a schematic structural view of the shut-off valve sealing performance evaluation device provided in the first embodiment of the present application;

FIG. 2 is a flow chart of a method for evaluating the tightness of a shut-off valve provided in the second embodiment of the present application;

3 is a flow chart of another part of the method for evaluating the tightness of the stop valve provided in the second embodiment of the present application;

Fig. 4 is a flow chart of another part of the shut-off valve sealing performance evaluation method provided in the second embodiment of the present application;

FIG. 5 is a flow chart of a method for judging the suitability of the sealing performance of the shut-off valve provided in the third embodiment of the present application.

Icons: 10-globe valve sealing evaluation device; 100-seal chamber; 200-air pressure adjustment device; 210-hand valve; 220-regulating pump; 230-communicating pipe; 300-air pressure monitoring device; Temperature monitoring device; 500-control device; 600-opening controller.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that if the orientation or positional relationship indicated by the terms "upper", "lower", "inner" and "outer" appear, it is based on the orientation or positional relationship shown in the drawings, or It is the orientation or positional relationship that the invention product is usually placed in use, and it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation , and therefore cannot be construed as a limitation of the present invention.

In addition, terms such as "first" and "second" are used only for distinguishing descriptions, and should not be understood as indicating or implying relative importance.

It should be noted that, in the case of no conflict, the features in the embodiments of the present invention may be combined with each other.

first embodiment

Please refer to Fig. 1, a shut-off valve tightness evaluation device 10 is provided in the present embodiment for evaluating the shut-off valve tightness, in other words, the shut-off valve tightness evaluation device 10 can test the shut-off valve tightness for convenience Evaluate the tightness of the shut-off valve.

It should be noted that the cut-off valve can be applied in the electric stack of the fuel cell system. The cut-off valve is set on the air intake channel of the stack to close the intake channel when the fuel cell system is shut down, preventing air from entering the stack and causing air to gradually penetrate into the anode through the cathode through the proton membrane, thereby preventing the air from entering the anode after the next start-up. The formation of a hydrogen-air interface at the anode causes an excessively high overpotential, which can prevent the catalyst in the proton exchange membrane from being consumed, so as to ensure the performance of the stack and the durability of the stack. However, in the prior art, the shut-off valve usually has a certain leakage and cannot be fully sealed. Therefore, the tightness test of the shut-off valve is particularly important.

Based on this, the shut-off valve tightness evaluation device 10 in this embodiment is provided to improve the problem in the prior art that the shut-off valve cannot be accurately evaluated and judged because the tightness test of the shut-off valve can only be performed in a single environment. technical problem.

In this embodiment, the shut-off valve sealing performance evaluation device 10 includes a sealing chamber 100 , an air pressure regulating device 200 , an air pressure monitoring device 300 and a control device 500 . Wherein, the sealed cavity 100 is a movable sealed cavity 100, in other words, the sealed cavity 100 can be moved to any environment; for example, the sealed cavity 100 can be moved to a high temperature environment; also for example, the sealed cavity 100 can be moved to Moderate high pressure environment. In addition, the sealed chamber 100 has an air port (not shown in the figure), which can be used for air intake or outlet of the sealed chamber 100, and the air port is used for assembling a shut-off valve. The air pressure adjusting device 200 is connected to the sealed chamber 100 , and the air pressure adjusting device 200 is used for charging or extracting gas into the sealed chamber 100 to adjust the air pressure in the sealed chamber 100 . The air pressure monitoring device 300 is connected to the sealed chamber 100 to monitor the air pressure inside the sealed chamber 100 . Both the air pressure monitoring device 300 and the air pressure adjusting device 200 are electrically connected to the control device 500 . The control device 500 can be used to control the air pressure adjusting device 200 to adjust the air pressure in the sealed chamber 100 . The control device 500 is also used to obtain the air pressure in the sealed cavity 100 monitored by the air pressure monitoring device 300 . Moreover, when the shut-off valve is closed and the air pressure regulating device 200 is shut down, the control device 500 is also used to record the change of the air pressure in the sealed chamber 100, so as to evaluate the tightness of the shut-off valve according to the change.

It is worth noting that the air pressure adjusting device 200 can fill or extract air into the sealed chamber 100 during operation, so as to adjust the air pressure inside the sealed chamber 100 . When the gas pressure regulating device 200 is shut down, the communication relationship between the gas pressure regulating device 200 and the sealed cavity 100 is disconnected. At this time, the gas in the sealed cavity 100 cannot leak from the gas pressure regulating device 200 side. Based on this, after the air pressure regulating device 200 completes the adjustment of the air pressure inside the sealed cavity 100, the gas inside the sealed cavity 100 can only flow out from the gas port. Check the leakage of the shut-off valve.

As mentioned above, when evaluating the sealing performance of the shut-off valve, the shut-off valve is assembled on the air port of the sealing chamber 100 and the shut-off valve is closed. The control device 500 can adjust the air pressure inside the sealed cavity 100 through the air pressure adjusting device 200 , and control the air pressure adjusting device 200 to shut down when the air pressure inside the sealed cavity 100 reaches a specified pressure. Then the control device 500 starts to record the change of the air pressure in the sealed chamber 100 , so that the leakage of the shut-off valve can be inferred, and the tightness of the shut-off valve can be evaluated. At the same time, the sealed cavity 100 can be moved to any environment, for example, the sealed cavity 100 can be moved to a high-temperature environment or a high-pressure environment, so as to simulate the working conditions of the globe valve under high-temperature or high-pressure environments; The cavity 100 can also be moved to any designated environment to test the shut-off valve according to actual needs, so as to meet the applicable requirements of the fuel cell system. In other words, it can accurately evaluate and judge the shut-off valve of the fuel cell system, and improve the existing It is a technical problem that it is impossible to accurately evaluate and judge the globe valve in the technology.

It is worth noting that, in order to effectively evaluate the tightness of the cut-off valve applied to the fuel cell system, optionally, the volume of the sealed cavity 100 is designed according to the overall volume of the electric stack and its intake passage of the corresponding fuel cell system , so that the sealed chamber 100 can accurately simulate the electric stack, thereby more accurately simulating the working condition of the shut-off valve in the electric stack, and improving the evaluation accuracy. In addition, there is no limitation on the shape of the sealed cavity 100 .

Optionally, in this embodiment, the air pressure regulating device 200 includes a regulating pump 220 and a hand valve 210; the regulating pump 220 can be connected to the sealed chamber 100 through the communication pipe 230, so as to fill the sealed chamber 100 with gas through the communication pipe 230 or pump out the gas. The hand valve 210 is disposed on the communication pipe 230 for closing or opening the communication pipe 230 . When the hand valve 210 closes the communication pipe 230 , the communication pipe 230 is sealed, and the gas in the sealed cavity 100 cannot leak out from the communication pipe 230 at this time. When adjusting the air pressure inside the sealed chamber 100 , the hand valve 210 is opened, and the gas is charged into or drawn out from the sealed chamber 100 by adjusting the pump 220 to adjust the air pressure inside the sealed chamber 100 . When the air pressure inside the sealing chamber 100 reaches the specified air pressure, closing the hand valve 210 can complete the sealing of the sealing chamber 100, preventing the gas in the sealing chamber 100 from leaking from the connecting pipe 230, and preventing the impact on the sealing evaluation of the stop valve.

It should be understood that in other embodiments of the present application, the air pressure regulating device 200 can also use other equipment, for example, the air pressure regulating device 200 can be a vacuum machine, which can extract gas from the sealed chamber 100; 200 may be an air pump to charge gas or the like into the sealed chamber 100 .

In addition, in this embodiment, the shut-off valve tightness evaluation device 10 also includes an opening controller 600, the opening controller 600 is electrically connected to the shut-off valve, and is electrically connected to the control device 500; the control device 500 is also used to pass the opening The degree controller 600 controls the cut-off valve to adjust the opening degree.

The cut-off valve can be controlled to increase or decrease repeatedly through the opening controller 600, and the durability test of the cut-off valve can be carried out to facilitate the simulation of the working conditions of the cut-off valve after long-term use, that is, the long-term use of the cut-off valve Afterwards, the sealing performance is evaluated and judged, so as to comprehensively evaluate and judge the sealing performance of the shut-off valve.

It should be noted that when the cut-off valve sealing performance evaluation device 10 evaluates the cut-off valve, the tightness evaluation can be performed without repeated opening and closing of the cut-off valve, or can be performed after the cut-off valve is repeatedly opened and closed. Sealing evaluation. In other words, when the opening controller 600 is provided, the shut-off valve sealing evaluation device 10 in this embodiment can not only evaluate the tightness of the shut-off valve when it is put into use, but also evaluate the tightness of the shut-off valve after it has been used for a long time. , can comprehensively evaluate and understand the tightness of the globe valve.

Optionally, in this embodiment, the shut-off valve tightness evaluation device 10 further includes a temperature-adjustable thermostat 400, the thermostat 400 is electrically connected to the control device 500, and the control device 500 is used to adjust the temperature inside the thermostat 400, The sealed chamber 100 is located inside the thermostat 400 .

Setting the sealing chamber 100 inside the incubator 400 can directly adjust the internal temperature of the incubator 400 to achieve the purpose of adjusting the application environment of the globe valve, thereby meeting the requirements for evaluating the sealing performance of the globe valve in different temperature environments. Improve the accuracy of globe valve evaluation.

It should be understood that when evaluating the tightness of the shut-off valve, the operator can adjust the temperature inside the thermostat 400 according to actual needs, thereby adjusting the temperature environment of the shut-off valve, for example, adjusting the temperature inside the thermostat 400 to Normal temperature can simulate the working condition of the stop valve at normal temperature; for another example, adjusting the temperature inside the thermostat 400 to a high temperature state can simulate the working condition of the stop valve at high temperature. Of course, the sealed chamber 100 can also be taken out of the incubator 400 .

Optionally, in this embodiment, the shut-off valve tightness evaluation device 10 also includes a temperature monitoring device 410, which is connected to the sealed cavity 100 and used to detect the temperature inside the sealed cavity 100; the temperature monitoring device 410 is connected to the sealed cavity 100 The control device 500 is electrically connected, and the control device 500 is used to acquire the temperature monitored by the temperature monitoring device 410 .

The temperature inside the sealed chamber 100 is monitored by the temperature monitoring device 410, so that when the temperature of the environment where the sealed chamber 100 is located is adjusted by the thermostat 400, the tightness evaluation test of the shut-off valve can be performed after the internal temperature of the sealed chamber 100 is stabilized. To prevent the temperature change inside the sealing chamber 100 from causing large errors in the sealing test of the shut-off valve, thereby ensuring the accuracy of the tightness test of the shut-off valve.

It should be understood that, in the embodiment of the present application, optionally, the air pressure monitoring device 300 may adopt a pressure sensor. The temperature monitoring device 410 may be a temperature sensor.

In summary, the shut-off valve tightness evaluation device 10 provided in this embodiment can move the sealed cavity 100 to any environment, for example, the sealed cavity 100 can be moved to a high temperature environment or a high pressure environment, so that it can simulate The working condition of the shut-off valve in a high-temperature or high-pressure environment; and the sealed chamber 100 can also be moved to any designated environment for the test of the shut-off valve according to actual needs, to meet the applicable requirements of the fuel cell system, in other words, it can accurately monitor the fuel cell The shut-off valve of the system is accurately evaluated and judged to improve the technical problem that the cut-off valve cannot be accurately evaluated and judged in the prior art.

second embodiment

Please refer to FIG. 1 and FIG. 2 in conjunction. This embodiment provides a shut-off valve tightness evaluation method, which is applied to the shut-off valve tightness evaluation device 10 provided in the first embodiment. In other words, the first embodiment The shut-off valve leak tightness evaluation device 10 provided in the present embodiment can adopt the shut-off valve tightness evaluation method provided in this embodiment to evaluate the shut-off valve tightness.

It is worth noting that, before evaluating the sealing performance of the shut-off valve, the shut-off valve is assembled on the gas port of the sealed chamber 100 first.

After the shut-off valve is assembled on the gas port of the sealed cavity 100, the test and evaluation of the tightness of the shut-off valve can be started. Among them, the evaluation methods for the tightness of globe valves include:

S1. Adjust the air pressure in the sealing chamber 100 to the first preset air pressure, and close the stop valve assembled on the air port.

In other words, the air pressure adjusting device 200 can be controlled by the control device 500 to adjust the air pressure inside the sealed chamber 100 until the air pressure inside the sealed chamber 100 reaches the first preset air pressure. Then control the air pressure regulating device 200 to shut down, that is, control the regulating pump 220 to close, and control the hand valve 210 to close the communication pipe 230 . At the same time, the through-hole opening controller 600 controls the opening of the shut-off valve to be adjusted to a minimum, that is, closes the shut-off valve.

In addition, in this embodiment, the first preset air pressure is lower than the atmospheric pressure. Based on this, an air pressure difference is formed between the sealed cavity 100 and the outside world. In the case of a leakage of the shut-off valve, the outside air can enter the sealed chamber from the shut-off valve. cavity 100 , it appears as the change of air pressure inside the sealed cavity 100 . It is worth noting that when the fuel cell system is shut down, the air pressure inside the stack is relatively low, and if there is leakage in the shut-off valve, the outside air can enter the interior of the stack through the shut-off valve. Therefore, setting the first preset air pressure to be lower than the atmospheric pressure can simulate the working condition that the outside air enters the stack from the shut-off valve, and can accurately detect and evaluate the tightness of the shut-off valve.

When the connecting pipe 230 and the shut-off valve are closed, the change of the air pressure in the sealed chamber 100 can reflect the leakage of the shut-off valve. Thus, the change of the air pressure in the sealed chamber 100 can be recorded by the controller to detect the status of the shut-off valve. Leakage, from which the tightness of the shut-off valve can be evaluated. Based on this, after step S1, the shut-off valve sealing evaluation method includes:

S2. Record the time taken for the air pressure in the sealed chamber 100 to rise from the first preset air pressure to the atmospheric pressure to obtain a time value.

In other words, after the air pressure regulating device 200 adjusts the air pressure in the sealed chamber 100 to the first preset air pressure, and the air pressure inside the sealed chamber 100 is stable, the control device 500 starts timing until the air pressure inside the sealed chamber 100 rises to atmospheric pressure. The time taken for the control device 500 to start counting until the air pressure inside the sealed cavity 100 rises to atmospheric pressure is the time value recorded by the control device 500 .

S3. Evaluate the tightness of the shut-off valve according to the time value.

Generally, the larger the time value, the better the sealing performance of the cut-off valve; correspondingly, the smaller the time value, the worse the sealing performance of the cut-off valve.

Based on this, when the user has multiple types of cut-off valves, the sealing performance of multiple cut-off valves can be tested and evaluated sequentially. Well, it is convenient for the user to select an appropriate shut-off valve from various shut-off valves and put it into the fuel cell system.

Optionally, please refer to FIG. 3 , in order to evaluate the sealing performance of the shut-off valve after a relatively long period of investment, in this embodiment, before step S1, the method for evaluating the tightness of the shut-off valve may further include:

S11. Controlling the opening degree The controller 600 adjusts the opening degree of the shut-off valve to gradually increase until the opening degree of the shut-off valve reaches a maximum.

S12. After the opening of the stop valve reaches the maximum and lasts for a first preset time, control the opening controller 600 to adjust the opening of the stop valve to gradually decrease until the stop valve is closed.

S13. After the cut-off valve is closed and lasts for the second preset time, return to the step of controlling the opening controller 600 to adjust the opening of the cut-off valve to gradually increase until the cut-off valve reaches the maximum, until the cut-off valve is opened or closed The number of times reaches the first preset number of times.

Wherein, when the opening of the shut-off valve reaches the maximum or the opening of the shut-off valve reaches the minimum, the opening of the shut-off valve is controlled to maintain the first preset time or the second preset time, so as to facilitate the simulation of the shut-off valve at the maximum opening or the opening of the cut-off valve. Based on this, the state of the globe valve after multiple uses can be simulated. In other words, evaluating the tightness of the shut-off valve after completing steps S11 to S13 can evaluate the tightness of the shut-off valve after it has been put in for a long time.

Optionally, in order to improve the efficiency of detection and evaluation, the values of the first preset time and the second preset time may be 10s-30s, in other words the values of the first preset time and the second preset time may be 10s, 11s, 12s, 13s, 14s, 15s, 16s, 17s, 18s, 19s, 20s, 21s, 22s, 23s, 24s, 25s, 26s, 27s, 28s, 29s or 30s etc. It should be understood that, in some implementation manners, the value of the first preset time and the value of the second preset time may be the same. Certainly, the value of the first preset time and the value of the second preset time may also be different.

In addition, the value of the first preset number of times can be set according to the actual application environment of the fuel cell system. For another example, in the case where the fuel cell system is applied to a power consumption system that runs continuously for a long time, the value of the first preset number of times may be relatively small.

It should be noted that the execution of steps S11 to S13 can be performed according to the selection of the user. In other words, in some evaluation methods for the tightness of the cut-off valve, steps S11 to S13 may not be executed.

Optionally, please refer to Fig. 4, in the case where a thermostat 400 is provided in the shut-off valve tightness evaluation device 10, the temperature of the thermostat 400 can be adjusted according to the actual required temperature environment, thereby adjusting the sealing chamber 100 and the position of the shut-off valve. The temperature environment at the place can fully simulate the various working environments of the globe valve. Based on this, before step S1, the method for evaluating the tightness of the stop valve may also include:

Step S15 , controlling the internal temperature of the thermostat 400 to reach a preset temperature value.

Wherein, the preset temperature value can be set according to the actual situation. For example, if the temperature environment for testing the shut-off valve needs to be adjusted to 200°C, the preset temperature value is set to 200°C.

By controlling the temperature inside the thermostat 400 to adjust to a preset temperature value, the sealed chamber 100 can be placed in an environment with a preset temperature value, thereby simulating the working condition of the stop valve in an environment with a preset temperature value, so as to facilitate the operation according to the actual situation. Adjust the sealing evaluation environment of the stop valve to achieve the purpose of improving the evaluation accuracy.

Based on the evaluation method of the shut-off valve tightness provided above, the working conditions of the shut-off valve in different temperature environments can be simulated, thereby testing the tightness of the shut-off valve in different temperature environments, so as to comprehensively complete the evaluation of the tightness of the shut-off valve . In addition, it can simulate the tightness evaluation of the stop valve under different service periods, so as to complete the tightness evaluation of the stop valve in different stages of wear and tear, and can accurately complete the tightness evaluation of the stop valve, which is convenient for users in multiple Choose from a variety of globe valves.

third embodiment

This embodiment provides a method for judging the suitability of the shut-off valve tightness, which is applied to the shut-off valve tightness evaluation device 10 in the first embodiment. In other words, the shut-off valve tightness evaluation device 10 provided in the first embodiment can To judge the applicability of the shut-off valve, to judge whether the shut-off valve is suitable for the fuel cell system in the specified power consumption system.

It should be noted that, for a fuel cell system applied to a designated power consumption system, it has a leakage standard rate. For example, in the case of using commercial vehicles as the designated power system, commercial vehicles generally shut down on weekends, in other words, the downtime of commercial vehicles is at least 48 hours, and the downtime of commercial vehicles is set to be at least 72 hours in consideration of the margin . Based on this, according to the test verification, in the initial stage of commercial vehicle shutdown, the pressure of the cathode side in the stack is 70kpa. With the gradual consumption of hydrogen on the anode side and the infiltration of air, when the pressure on the cathode side gradually increases to 95kpa, the residual hydrogen in the stack is basically consumed. At this time, the stack will be damaged when the commercial vehicle is started next time. Based on the above content, the standard leakage rate of commercial vehicles is (95kpa-70kpa)/72h*2, which is 48.2mPa/s. It is worth noting that 2 in the above formula refers to the number of cut-off valves, that is, there are two cut-off valves in the two communicating pipes 230; in addition, mPa means milliPascal.

After obtaining the leakage standard rate of the designated power consumption system, the leakage standard of the shut-off valve can be compared with the leakage standard rate as a judgment reference to determine whether the shut-off valve is applicable to the fuel cell system of the power consumption system.

In this embodiment, please refer to Figure 5, the method for judging the suitability of the shut-off valve tightness includes:

S100. Adjust the air pressure in the sealing chamber 100 to a second preset air pressure, and close the stop valve assembled on the air port.

Wherein, the second preset air pressure is less than atmospheric pressure.

S200. Record the time taken for the air pressure in the sealed chamber 100 to rise from the second preset air pressure to the third preset air pressure to obtain a time value.

Wherein, the principles of step S100 and step S200 are the same as those of step S1 and step S2 in the second embodiment, and will not be repeated here.

S300. Calculate the leakage rate of the stop valve according to the second preset air pressure, the third preset air pressure and the time value.

When the time value is obtained, the leakage rate of the cut-off valve within the time period represented by the time value can be calculated according to the second preset air pressure, the third preset air pressure and the time value.

Wherein, the method of calculating the leakage rate of the shut-off valve according to the second preset air pressure, the third preset air pressure and the time value is as follows:

The leakage rate is obtained by dividing the difference between the second preset air pressure and the third preset air pressure by the time value.

S400. If the leakage rate is lower than the leakage standard rate of the fuel cell system applied to the designated power consumption system, the shut-off valve can be applied to the fuel cell system applied to the designated power consumption system.

If the leakage rate is lower than the leakage standard rate, the leakage of the shut-off valve is small, which is not enough to infiltrate too much air inside the stack during the shutdown time of the power system, so as to prevent the leakage when the stack is started next time. The condition that the anode forms a hydrogen-air interface can avoid the consumption of the catalyst in the proton exchange membrane due to high overpotential, and can ensure that the performance and durability of the stack are not affected.

To sum up, the method for judging the suitability of the shut-off valve tightness provided in this embodiment can take the leakage standard rate of the fuel cell system of the specified power consumption system as the standard, and the leakage of the shut-off valve obtained by the shut-off valve tightness evaluation device 10 The rate is compared with the leakage standard rate to judge whether the shut-off valve is suitable for the fuel cell system of the specified power consumption system, so as to quickly help users select the shut-off valve.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

1. A cut-off valve tightness evaluation device for evaluating the tightness of a cut-off valve applied in a fuel cell system, characterized in that the cut-off valve tightness evaluation device comprises: A movable sealed chamber has an air port for air intake or air outlet; the air port is used to assemble the shut-off valve; An air pressure regulating device, connected to the sealed cavity, for filling or extracting gas into the sealed cavity to adjust the air pressure in the sealed cavity; an air pressure monitoring device connected to the sealed chamber to monitor the air pressure inside the sealed chamber; and, A control device, the air pressure monitoring device and the air pressure adjustment device are electrically connected to the control device; the control device is used to control the air pressure adjustment device to adjust the air pressure of the sealed cavity; the control device is used to obtain The air pressure in the sealed cavity monitored by the air pressure monitoring device; when the shut-off valve is closed and the air pressure regulating device is shut down, the control device is also used to record the change of the air pressure in the sealed cavity, based on The changes evaluate the tightness of the shut-off valve. 2. The shut-off valve tightness evaluation device according to claim 1, wherein the shut-off valve tightness evaluation device further comprises an opening controller, and the opening controller is electrically connected to the shut-off valve, and It is electrically connected with the control device; the control device is also used to control the cut-off valve to adjust the opening degree through the opening degree controller. 3. The shut-off valve tightness evaluation device according to claim 1, characterized in that, the shut-off valve tightness evaluation device also includes a temperature-adjustable thermostat, and the thermostat is electrically connected to the control device, and the thermostat is electrically connected to the control device. The control device is used to adjust the temperature inside the incubator, and the sealed cavity is arranged inside the incubator. 4. The shut-off valve tightness evaluation device according to claim 3, characterized in that, the shut-off valve tightness evaluation device also includes a temperature monitoring device, the temperature monitoring device is connected to the sealed cavity, and is used to detect The temperature inside the sealed cavity; the temperature monitoring device is electrically connected to the control device, and the control device is used to obtain the temperature monitored by the temperature monitoring device. 5. The shut-off valve tightness evaluation device according to claim 1, wherein the air pressure regulating device includes a regulating pump and a hand valve; the regulating pump is connected to the sealing chamber through a communication pipe to pass through the The communication pipe fills or draws gas into the sealed cavity; the hand valve is arranged on the communication pipe for closing or opening the communication pipe. 6. A method for evaluating the tightness of a cut-off valve, applied to the device for evaluating the tightness of a cut-off valve according to any one of claims 1-5, wherein the method for evaluating the tightness of a cut-off valve comprises: Adjusting the air pressure in the sealed cavity to a first preset air pressure, and closing the stop valve mounted on the air port; the first preset air pressure is less than atmospheric pressure; Recording the time taken for the air pressure in the sealed cavity to rise from the first preset air pressure to atmospheric pressure to obtain a time value; The tightness of the shut-off valve is evaluated based on the time value. 7. The shut-off valve tightness evaluation method according to claim 6, wherein the shut-off valve tightness evaluation device further comprises an opening controller, and the opening controller is electrically connected to the shut-off valve, and Electrically connected with the control device; the control device is also used to control the cut-off valve to adjust the opening through the opening controller; Before the step of adjusting the air pressure in the sealed cavity to the first preset air pressure and closing the shut-off valve assembled at the air port, the method for evaluating the tightness of the shut-off valve further includes: controlling the opening controller to adjust the opening of the stop valve to gradually increase until the opening of the stop valve reaches a maximum; After the opening of the stop valve reaches the maximum and lasts for a first preset time, controlling the opening controller to adjust the opening of the stop valve to gradually decrease until the stop valve is closed; After the shut-off valve is closed and lasts for a second preset time, return to the step of controlling the opening controller to adjust the opening of the shut-off valve to gradually increase until the opening of the shut-off valve reaches a maximum, until The number of opening or closing times of the cut-off valve reaches a first preset number of times. 8. The method for evaluating the tightness of the stop valve according to claim 6, wherein the device for evaluating the tightness of the stop valve further comprises a temperature-adjustable thermostat, the thermostat is electrically connected to the control device, and the thermostat is electrically connected to the control device. The control device is used to adjust the temperature inside the incubator, and the sealed cavity is arranged inside the incubator; Before adjusting the air pressure in the sealed cavity to a first preset air pressure and closing the stop valve; before the step of the first preset air pressure being less than atmospheric pressure, the method for evaluating the sealing performance of the stop valve further includes: controlling the internal temperature of the incubator to reach a preset temperature value. 9. A method for judging the suitability of the shut-off valve tightness, which is applied to the shut-off valve tightness evaluation device as described in any one of claims 1-5, and is used to judge whether the shut-off valve is suitable for use in specified applications. The fuel cell system of the electric system is characterized in that the method for judging the suitability of the shut-off valve sealing performance includes: adjusting the air pressure in the sealed cavity to a second preset air pressure, and closing the shut-off valve mounted on the air port; Recording the time taken for the air pressure in the sealed chamber to rise from the second preset air pressure to the third preset air pressure to obtain a time value; calculating the leakage rate of the stop valve according to the second preset air pressure, the third preset air pressure and the time value; If the leakage rate is less than the leakage standard rate of the fuel cell system applied to the designated power consumption system, the stop valve can be applied to the fuel cell system applied to the designated power consumption system. 10. The method for judging suitability of the shut-off valve tightness according to claim 9, wherein the step of calculating the leakage rate of the shut-off valve according to the second preset air pressure, the third preset air pressure and the time value comprises: The leakage rate is obtained by dividing the difference between the second preset air pressure and the third preset air pressure by the time value.

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