CN106440926B - A kind of detection method and monitoring system of flow of heat exchange fluid - Google Patents
A kind of detection method and monitoring system of flow of heat exchange fluid Download PDFInfo
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- CN106440926B CN106440926B CN201611076927.9A CN201611076927A CN106440926B CN 106440926 B CN106440926 B CN 106440926B CN 201611076927 A CN201611076927 A CN 201611076927A CN 106440926 B CN106440926 B CN 106440926B
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- 239000012530 fluid Substances 0.000 title claims abstract description 157
- 238000001514 detection method Methods 0.000 title claims abstract description 44
- 238000012544 monitoring process Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000004378 air conditioning Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000007710 freezing Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000002592 echocardiography Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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Abstract
The present invention relates to a kind of detection method of flow of heat exchange fluid and monitoring systems, belong to field of heat exchange.Multiple temperature that the present invention passes through acquisition heat-exchange fluid, compare the temperature of acquisition, judge whether heat-exchange fluid flows, the specific method for acquiring multiple temperature is successively to acquire multiple temperature, or the temperature of the same position different time by acquiring heat-exchange fluid along the direction that flows to of heat-exchange fluid；Temperature-detecting device is established dry contact signal by the relay with normally-closed contact with heat exchange control system and is connected; heat exchange control system and temperature-detecting device independently work; interacting there is no electric signal between the two; it thus can be improved the job stability of whole system; when heat exchanger is not flowed using lateral line hot fluid or heat exchanger is using lateral line fluid temperature (F.T.) overtemperature; trigger relay obtains electrically disconnected; heat exchange control system stops working after receiving cut-off signal, realizes the protection of exchange thermal control system.
Description
Technical Field
The invention belongs to the field of heat exchange, and particularly relates to a detection method and a monitoring system for heat exchange fluid flow.
Background
In a central air conditioning system or a heat pump system, heat exchange needs to be performed through a heat exchanger, and fluid for heat exchange is conducted to a room to be used through a pipeline after heat exchange is performed in the heat exchanger, so that refrigeration or heating is realized.
The heat exchanger is a device for realizing heat transfer between two fluids with different temperatures, and heat is transferred to the fluid with lower temperature from the fluid with higher temperature, so that the temperature of the fluid reaches the index specified by the process to meet the requirements of process conditions. The shell-and-tube heat exchangers, the sleeve-type heat exchangers, the plate-type heat exchangers and the like comprise heat exchanger use side pipelines and heat exchanger source side pipelines arranged in the heat exchanger use side pipelines, wherein the heat exchanger source side pipelines are connected into a central air-conditioning system or a heat pump system, and the flow and temperature control of fluid in the source side pipelines are controlled by the central air-conditioning system or the heat pump system. Two fluids with different temperatures flow in the space separated by the wall surface, and heat exchange is carried out between the two fluids through heat conduction of the wall surface. For the fluid of the side pipeline of the heat exchanger, the fluid flow is realized by other power systems, during heat exchange, the condition that the fluid of the side pipeline of the heat exchanger is insufficient in fluidity or does not flow may occur, but at the moment, the central air-conditioning system or the heat pump system still works, and heat exchange cannot be realized in the heat exchanger, so that the temperature of the fluid of the side pipeline of the heat exchanger source is always increased or always decreased, the problem of overhigh temperature or freezing may occur, and the heat exchanger is damaged, and even the central air-conditioning system or the heat pump system is damaged.
To this end, the prior art teaches some heat exchangers that use monitoring of the side line fluid flow. At present, the water flow detection methods in the heating and ventilation industry include a target flow switch detection method, a pressure difference detection method and an ultrasonic detection method. They each have their own advantages and also have a number of disadvantages.
The target flow switch detection method is characterized in that a target flow switch is arranged in a pipeline connected with a heat exchanger use side pipeline, when fluid in the heat exchanger use side pipeline flows, the fluid can rush the target flow mechanical switch, and a signal switch arranged on the target flow mechanical switch is triggered to be conducted, so that the fluid flow is known. However, the target flow mechanical switch needs to be connected in series in the pipeline, the installation is complex, great resistance is generated to water flow, especially the resistance in the small-diameter pipeline (such as the pipeline ND25 and below) is not negligible, and in addition, the mechanical switch is easy to cause the defects of corrosion and the like due to the humidity and temperature change of the working environment, so that the mechanical switch is blocked at a certain position, and the water flow detection cannot be realized.
The pressure difference detection method is characterized in that a liquid column type pressure gauge, such as a U-shaped pressure gauge, is arranged at the inlet and outlet positions of a pipeline connected with a pipeline on the use side of the heat exchanger, and whether fluid flows or not is judged by comparing the pressure difference change at the inlet and outlet positions when the fluid flows. However, the disadvantage is that the detection error is easily generated when the inner blockage of the heat exchanger is detected, and the water sealed in the liquid column pressure gauge is damaged due to freezing in the low temperature environment in winter.
The ultrasonic sensor detects the flow of fluid by utilizing the principle that the ultrasonic waves are reflected by the liquid interface to form echoes, but has high use cost and large installation space.
Disclosure of Invention
In view of the above, the present invention is directed to overcome the deficiencies of the prior art, and to provide a method and a system for detecting and monitoring the flow of a heat exchange fluid, which monitor the flow of the heat exchange fluid by using the temperature change of the heat exchange fluid.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for detecting the flow of heat exchange fluid includes collecting multiple temperatures of heat exchange fluid, comparing the collected temperatures, and judging whether the heat exchange fluid flows or not;
the method for acquiring the plurality of temperatures of the heat exchange fluid comprises the step of sequentially acquiring the plurality of temperatures along the flowing direction of the heat exchange fluid.
Further, three temperatures are sequentially collected along the flowing direction of the heat exchange fluid, and are respectively the temperature T at the inlet position of the heat exchange fluidinIntermediate position temperature T of heat exchange fluidmidAnd the temperature T of the outlet position of the heat exchange fluidout；
When T isin、Tmid、ToutThe relationship between satisfies Tin＞Tmid＞ToutAnd Tin＜Tmid＜ToutEither condition, the heat exchange fluid is flowing.
Further, when | Tin-ToutWhen | ≧ T1, where T1 is the heat exchange fluidAn alarm threshold for insufficient fluid flow, the heat exchange fluid is flowing, but not flowing sufficiently.
Further, when T ismid＞TinAnd Tmid＞ToutOr when T ismid＜TinAnd Tmid＜ToutWhen the temperature of the water is higher than the set temperature,
if Tin-Tmid| is ≧ T2, and | Tout-Tmid| T2, where T2 is the alarm threshold for no flow of the heat exchange fluid, and no flow of the heat exchange fluid.
Further, the method for acquiring the multiple temperatures of the heat exchange fluid further comprises acquiring the temperatures of the same position of the heat exchange fluid at different times, setting a time interval Δ t for acquiring the temperatures, and acquiring the temperatures of the same position of the heat exchange fluid at the time interval Δ t: t is1、T2…Tn-1、TnWherein n is more than or equal to 2;
by the formula K ═ l (T)n-Tn-1) Obtaining the temperature change slope K of the time interval delta t;
setting a slope threshold K1 for the flow of said heat exchange fluid,
if K is greater than or equal to K1, the heat exchange fluid does not flow;
if K < K1, the heat exchange fluid is flowing.
The monitoring system for the flow of the heat exchange fluid utilizes the detection method for the flow of the heat exchange fluid and comprises a heat exchanger, a temperature detection device and a heat exchange control system,
the temperature detection device comprises at least one temperature sensor, an A/D conversion module, a processor module, a relay and a power supply module; the power supply module is used for providing working voltage of the temperature detection device; the temperature sensor is connected to the A/D conversion module, and the A/D conversion module is connected to the processor module; the relay is provided with a normally closed contact, the coil end of the relay is connected with the processor module, and the normally closed contact of the relay is respectively connected with the heat exchange control system;
the heat exchanger comprises a heat exchanger use side pipeline and a heat exchanger source side pipeline arranged in the heat exchanger use side pipeline, and the temperature sensor is arranged on the heat exchanger use side pipeline.
Further, the heat exchange control system is a central air-conditioning control system or a heat pump control system, and the heat exchanger is any one of a coil heat exchanger, a shell-and-tube heat exchanger, a double-tube heat exchanger and a plate heat exchanger.
Furthermore, the number of the temperature sensors is three, and the three temperature sensors are sequentially arranged at the inlet position of the heat exchanger using side pipeline, the middle position of the heat exchanger using side pipeline and the outlet position of the heat exchanger using side pipeline.
Furthermore, the number of the temperature sensors is one, and the temperature sensors are arranged in the middle of the pipeline on the use side of the heat exchanger.
Further, the temperature detection device further comprises an indicator light, a buzzer and a display screen, wherein the indicator light, the buzzer and the display screen are respectively connected to the processor module.
By adopting the technical scheme, the invention at least has the following beneficial effects:
the specific method for acquiring the multiple temperatures comprises the steps of sequentially acquiring the multiple temperatures along the flow direction of the heat exchange fluid, or comparing the acquired temperatures by acquiring the temperatures of the same position of the heat exchange fluid at different times, judging whether the heat exchange fluid flows or not, and judging whether the heat exchange fluid has insufficient fluidity or not; according to the method for detecting the flow of the heat exchange fluid, the invention also provides a monitoring system for the flow of the heat exchange fluid, wherein the temperature detection device and the heat exchange control system in the monitoring system are in signal connection with each other through a relay with a normally closed contact, the heat exchange control system and the temperature detection device respectively and independently work, and no mutual influence of electric signals exists between the two devices, so that the working stability of the whole system can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the fluid heat exchange of the present invention;
FIG. 2 is a schematic diagram illustrating a method for calculating a temperature change slope K in a cooling mode in a heat exchange fluid flow detection method according to the present invention;
FIG. 3 is a schematic diagram illustrating a method for calculating a temperature change slope K in a heating mode according to a method for detecting a flow of a heat exchange fluid of the present invention;
FIG. 4 is a schematic view of an embodiment of a heat exchange fluid flow monitoring system of the present invention;
fig. 5 is a schematic diagram of the operation of a heat exchange fluid flow monitoring system of the present invention.
FIG. 1-heat exchanger; 2-temperature detection means; 3-a heat exchange control system; 101-heat exchanger use side line; 101 a-heat exchanger use side line inlet; 101 b-heat exchanger use side line outlet; 102-heat exchanger source side piping; 102 a-a heat exchanger source side tube inlet; 102 b-heat exchanger source side pipeline outlet; 201-temperature sensor; 202-A/D conversion module; 203-a processor module; 204-a relay; 205-a power supply module; 206-indicator light; 207-buzzer; 208-display screen.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic diagram of heat exchange of a heat exchange fluid, and the present invention provides a method for detecting a flow of a heat exchange fluid, which includes collecting a plurality of temperatures of the heat exchange fluid, comparing the collected temperatures, and determining whether the heat exchange fluid flows.
It can be known that, heat exchange is performed in the flowing process of the heat exchange fluid, so that the temperature of each position in the flowing direction of the heat exchange fluid or the temperature of the same position of the heat exchange fluid at different time can be changed, and whether the heat exchange fluid flows or not can be judged by comparing the temperature of each position in the flowing direction of the heat exchange fluid or the temperature of the same position of the heat exchange fluid at different time.
According to the above scheme, the present invention provides a preferable scheme, specifically: and sequentially collecting a plurality of temperatures along the flow direction of the heat exchange fluid, comparing the collected temperatures, and judging whether the heat exchange fluid flows.
Through the scheme, a plurality of temperatures are sequentially collected along the flowing direction of the heat exchange fluid, for example, two temperatures are collected, the temperature collecting points are respectively arranged at the inlet position and the outlet position of the heat exchange fluid, and can also be arranged at other positions of the heat exchange fluid, and only a certain distance is needed to be arranged between the two positions during specific setting.
Of course, more than two temperatures can be collected along the flow direction of the heat exchange fluid, and a certain distance is reserved between the temperature collection positions of two adjacent positions.
From the aspect of obtaining better detection effect, the more temperature collection points are set, the better the temperature collection points are, but from the aspect of cost and practical requirements, the less the temperature collection points are, the better the temperature collection points are, when only two temperature collection points are set, such as the inlet position and the outlet position of the heat exchanger use side pipeline, and when the fluid of the heat exchanger use side pipeline normally flows, the temperatures of the inlet position and the outlet position are different, so that it can be judged that the fluid of the heat exchanger use side pipeline flows, but when the fluid of the heat exchanger use side pipeline is reduced to a certain degree, although the temperatures of the inlet position and the outlet position of the heat exchanger use side pipeline are still different, the temperature of the middle position of the heat exchanger use side pipeline is obviously higher or lower than the temperatures of the two ends of the heat exchanger use side pipeline due to too long residence time of the fluid in the heat exchanger use, this can damage the heat exchanger and heat exchange control system, which is undesirable in actual use.
In order to overcome the defects, the invention provides a preferable scheme to solve the problems, and the preferable scheme comprises the following specific steps: sequentially collecting three temperatures along the flow direction of the heat exchange fluid, wherein the three temperatures are respectively the temperature T at the inlet position of the heat exchange fluidinIntermediate position temperature T of heat exchange fluidmidAnd the temperature T of the outlet position of the heat exchange fluidout；
When T isin、Tmid、ToutThe relationship between satisfies Tin＞Tmid＞ToutAnd Tin＜Tmid＜ToutEither condition, the heat exchange fluid is flowing.
According to the scheme, the heat exchange fluid carries out heat exchange, and the temperature of the heat exchange fluid in the flowing direction isGradually increase, corresponding to Tin＜Tmid＜Tout(ii) a During refrigeration, the temperature of the heat exchange fluid in the flowing direction is gradually reduced, and the temperature is Tin＞Tmid＞Tout。
For the scheme, the difference value of the inlet temperature and the outlet temperature of the heat exchange fluid is used for judgment, but the larger the difference value is, the better the difference value is, when the difference value of the inlet temperature and the outlet temperature of the heat exchange fluid reaches a certain degree, the flow of the heat exchange fluid is insufficient, the residence time of the heat exchange fluid in the heat exchanger is too long, the invention provides a preferable detection scheme, and when the absolute value T is greater than the preset threshold, the invention provides a preferable detection schemein-ToutWhen | ≧ T1, the heat exchange fluid is flowing but not flowing enough, wherein T1 is the alarm threshold value of the heat exchange fluid flowing not enough, and audible and visual alarms can be respectively given through a buzzer and an LED indicator lamp. Through the scheme, the alarm threshold value of insufficient heat exchange fluid flow is set, for example, the alarm threshold value is set to be 10 ℃, and when the absolute value of the difference value between the inlet temperature and the outlet temperature of the heat exchange fluid is greater than or equal to 10 ℃, the heat exchange fluid is judged to be insufficient in flow. The specific alarm threshold value given by the invention is just an application example, and in the practical application process, the specific set value of the alarm threshold value may not be the example value given by the invention, and the optimal alarm threshold value with insufficient heat exchange fluid flow should be set according to specific conditions.
With regard to the above solution, when the fluidity of the heat exchange fluid continues to decrease, although there may still be a certain difference between the temperatures of the inlet position and the outlet position of the heat exchange fluid, the residence time of the heat exchange fluid in the heat exchanger is too long, and the heat exchange state is always performed, so that the temperature of the middle position of the heat exchange fluid may be significantly higher or lower than the temperatures of the two ends of the heat exchange fluid, and for this problem, the present invention provides a preferable detection solution, specifically: at Tmid＞TinAnd Tmid＞ToutOr when T ismid＜TinAnd Tmid＜ToutWhen, if | Tin-Tmid| is ≧ T2, and | Tout-Tmid| is ≧ T2, wherein T2 isAnd when the heat exchange fluid does not flow, the alarm threshold value indicates that the heat exchange fluid does not flow, and sound and light alarms can be respectively sent out through a buzzer and an LED indicator lamp. By this solution, an alarm threshold is set, for example 3 ℃, at which the heat exchange fluid does not flow. And when the temperature of the middle position is respectively different from the two end positions by absolute values greater than or equal to 3 ℃ in a refrigerating or heating state, judging that the heat exchange fluid does not flow. When T ismidNot less than T3, or TmidWhen the current is less than or equal to T4, the normally closed contact of the relay is disconnected, and the heat exchange control system sends out a system operation stopping instruction after receiving the information to protect the heat exchange equipment; wherein T3 is the heat exchange high temperature protection threshold, and T4 is the heat exchange low temperature protection threshold.
For the scheme of collecting a plurality of temperatures of heat exchange fluid and comparing the collected temperatures to judge whether the heat exchange fluid flows, the invention also provides another detection scheme, which specifically comprises the following steps: collecting temperatures of the same position of the heat exchange fluid at different times, setting a time interval delta t for collecting the temperatures, and collecting the temperatures of the same position of the heat exchange fluid at the time interval delta t: t is1、T2…Tn-1、TnWherein n is not less than 2, and is represented by the formula K | (T)n-Tn-1) The/Δ t | yields the temperature change slope of the time interval Δ t, as shown in fig. 2 and 3;
the time slope threshold K1 for the heat exchange fluid flow is set,
if K is greater than or equal to K1, the heat exchange fluid does not flow;
if K < K1, the heat exchange fluid is flowing.
In the practical application process of the scheme, the temperatures of the middle positions of the heat exchange fluid at different times are collected preferentially.
According to the above various heat exchange fluid flow detection methods, the present invention provides a monitoring system for heat exchange fluid flow, as shown in fig. 1, 4 and 5, the monitoring system comprises a heat exchanger 1, a temperature detection device 2, a heat exchange control system 3,
wherein,
the temperature detection device 2 comprises at least one temperature sensor 201, an A/D conversion module 202, a processor module 203, a relay 204 and a power supply module 205; the power module 205 is configured to provide an operating voltage of the temperature detection device 2; the temperature sensor 201 is connected to the A/D conversion module 202, and the A/D conversion module 202 is connected to the processor module 203; the relay 204 is provided with normally closed contacts, the coil end of the relay 204 is connected with the processor module 203, and the normally closed contacts of the relay 204 are respectively connected with the heat exchange control system 3;
the heat exchanger 1 comprises a heat exchanger use side pipeline 101 and a heat exchanger source side pipeline 102 arranged in the heat exchanger use side pipeline 101, and the temperature sensor 201 is arranged on the heat exchanger use side pipeline 101.
In the monitoring system for the flow of the heat exchange fluid, the heat exchange control system 3 is a central air conditioning control system or a heat pump control system in the prior art, the heat exchanger 1 includes a heat exchanger use side pipeline 101 and a heat exchanger source side pipeline 102 arranged in the heat exchanger use side pipeline, and the heat exchanger 1 may be a coil type, shell-and-tube type, sleeve type, plate type or other type heat exchanger in the prior art, and includes a heat exchanger use side pipeline inlet 101a, a heat exchanger use side pipeline outlet 101b, a heat exchanger source side pipeline inlet 102a and a heat exchanger source side pipeline outlet 102 b.
The temperature sensors 201 are preferably provided in three numbers, and are provided at the use-side line inlet 101a of the heat exchanger, at the use-side line outlet 101b of the heat exchanger 1, and at the use-side line intermediate position of the heat exchanger in this order. In addition, the present invention may use only one temperature sensor, and the installation position of the temperature sensor is preferably set at the middle position of the heat exchanger use side pipeline.
From the viewpoint of obtaining better detection effect, it is better to provide more temperature sensors 201, but from the viewpoint of cost and practical requirements, it is better to provide fewer temperature sensors 201, and when only two temperature sensors 201 are provided, such as at the inlet position and the outlet position of the heat exchanger use side pipeline 101, and when the fluid of the heat exchanger use side pipeline 101 normally flows, the temperatures at the inlet position and the outlet position are different, it can be determined that the fluid of the heat exchanger use side pipeline 101 flows. However, when the fluid flow of the heat exchanger use side pipeline 101 is reduced to a certain degree, although the temperatures of the inlet position and the outlet position of the heat exchanger use side pipeline 101 are still different, due to insufficient flow of the heat exchange fluid, the residence time of the heat exchange fluid in the heat exchanger is too long, so that the temperature of the middle position of the heat exchanger use side pipeline 101 is obviously higher or lower than the temperatures of the two ends of the heat exchanger use side pipeline 101, and the heat exchanger and the heat exchange control system are damaged, which is not desirable in the actual use process.
Through the scheme, the temperature sensor 201 is arranged on the using side pipeline of the heat exchanger 1, and the arrangement mode has the advantages that the temperature sensor is not in direct contact with the heat exchange fluid, is not influenced by temperature change and corrosion of the heat exchange fluid, has the advantage of low cost, and can be directly arranged on the pipe wall of the using side pipeline of the heat exchanger, so that the temperature sensor has the advantage of convenience in installation.
In the invention, a temperature signal can be obtained through the temperature sensor 201, the temperature signal is converted through the A/D conversion module 202 and then sent to the processor module 203, the processor module 203 is preferably a single chip microcomputer, a comparison result between temperature data can be obtained through the logic operation of the single chip microcomputer, so that a switch signal can be provided for a coil of the relay 204, the opening or closing of a normally closed contact of the relay 204 is controlled, when the heat exchange of fluid in a use side pipeline of the heat exchanger is normally carried out, the normally closed contact of the relay 204 is in a closed state, the heat exchange control system 3 obtains a conducting signal, and the heat exchange control system 3 normally works; when fluid in a pipeline on the use side of the heat exchanger does not flow or the heat exchange temperature is over-temperature, the processor module 203 sends a trigger signal to the relay 204, the coil of the relay 204 is electrified to break the normally closed contact of the relay 204, the heat exchange control system 3 obtains a break signal to stop working, and the heat exchange control system 3 realizes self-protection.
The monitoring system of the invention can realize the function of monitoring the temperature of the heat exchange fluid in the heat exchanger using side pipeline 101 while monitoring the flowing condition of the heat exchange fluid in the heat exchanger using side pipeline 101 by a temperature sensor in a temperature acquisition mode, for example, the temperature sensor 201 is arranged at the middle position of the heat exchanger using side pipeline 101, an anti-freezing protection alarm value during refrigeration is set, and when the temperature detected by the temperature sensor 201 is lower than the set anti-freezing protection temperature, the heat exchange control system 3 stops working after obtaining a disconnection signal of the relay 204; and setting a heating overtemperature alarm value during heating, and when the temperature detected by the temperature sensor 201 is higher than the set heating overtemperature alarm value, stopping the heat exchange control system 3 after obtaining a turn-off signal of the relay 204, so that the heat exchange control system 3 can be protected.
In addition, in the invention, the heat exchange control system 3 and the temperature detection device 2 are connected through the on-off of the relay 204, and the relay 204 provides a dry contact signal for a normally closed contact when the system works normally, so that the heat exchange control system 3 and the temperature detection device 2 work independently respectively, and no mutual influence of electric signals exists between the two, thereby improving the working stability of the whole system.
The temperature detection device 2 triggers a signal for disconnecting the normally closed contact of the relay 204 only when detecting a heating overtemperature alarm value and an anti-freezing protection alarm value during refrigeration or when fluid of a pipeline on the use side of the heat exchanger does not flow, the heat exchange control system 3 stops working after receiving the normally closed contact disconnection signal of the relay 204, and the heat exchange control system 3 realizes self-protection.
As shown in fig. 5, as a preferred modification, the temperature detection device 2 further includes an indicator light 206, and the indicator light 206 is connected to the processor module 203, so as to provide an alarm for various conditions detected by the present invention, especially for the condition that the fluid in the heat exchanger use side pipeline 101 is not sufficiently fluid, in which case the relay 204 is still normally closed, and thus the heat exchange control system 3 is normally operated, so that the processor module 203 can control the indicator light 206 to send out an alarm signal.
As shown in fig. 5, the present invention further provides another sound alarm prompting means, the temperature detecting device 2 further includes a buzzer 207, and the buzzer 207 is connected to the processor module 203.
As shown in fig. 5, in order to facilitate understanding of the temperature detected by the temperature sensor 201 on the heat exchanger using side pipeline 101 on site, the temperature detecting device 2 further comprises a display screen 208, and the display screen 208 is connected to the processor module 208, so that the temperature detected by the temperature sensor 201 can be displayed on the display screen 208, and the heat exchange condition can be intuitively understood.
The invention realizes the flow monitoring, the temperature high-temperature protection and the temperature low-temperature protection of the fluid in the use side pipeline of the heat exchanger by arranging the temperature sensor on the use side pipeline of the heat exchanger, and the fluid in the use side pipeline of the heat exchanger can be liquid, such as water, and can also be gas. Compared with the devices used in the prior art which adopt the target flow switch detection method, the differential pressure detection method and the ultrasonic detection method, when the fluid in the side pipeline used by the heat exchanger is gas, the various detection devices in the prior art can not detect the flow of the gas fluid.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (5)
1. A method of detecting the flow of a heat exchange fluid, comprising: collecting a plurality of temperatures of heat exchange fluid, comparing the collected temperatures, and judging whether the heat exchange fluid flows;
the method for acquiring the plurality of temperatures of the heat exchange fluid comprises the following steps of sequentially acquiring the plurality of temperatures along the flow direction of the heat exchange fluid;
sequentially collecting three temperatures along the flow direction of the heat exchange fluid, wherein the three temperatures are respectively the temperature T at the inlet position of the heat exchange fluidinIntermediate position temperature T of heat exchange fluidmidAnd the temperature T of the outlet position of the heat exchange fluidout；
When T isin、Tmid、ToutThe relationship between satisfies Tin＞Tmid＞ToutAnd Tin＜Tmid＜ToutEither condition, the heat exchange fluid is flowing;
when T ismid＞TinAnd Tmid＞ToutOr when T ismid＜TinAnd Tmid＜ToutWhen the temperature of the water is higher than the set temperature,
if Tin-Tmid| is ≧ T2, and | Tout-Tmid| T2, where T2 is the alarm threshold for no flow of the heat exchange fluid, and no flow of the heat exchange fluid.
2. A method for detecting the flow of a heat exchange fluid according to claim 1, characterized in that:
when | Tin-ToutAnd | T1, wherein T1 is the alarm threshold of insufficient flow of the heat exchange fluid, which is flowing but not flowing enough.
3. A system for monitoring the flow of a heat exchange fluid, comprising: the monitoring system utilizes the detection method of heat exchange fluid flow of claim 1 or 2, the monitoring system comprises a heat exchanger, a temperature detection device and a heat exchange control system,
the temperature detection device comprises at least one temperature sensor, an A/D conversion module, a processor module, a relay and a power supply module; the power supply module is used for providing working voltage of the temperature detection device; the temperature sensor is connected to the A/D conversion module, and the A/D conversion module is connected to the processor module; the relay is provided with a normally closed contact, the coil end of the relay is connected with the processor module, and the normally closed contact of the relay is respectively connected with the heat exchange control system;
the heat exchanger comprises a heat exchanger use side pipeline and a heat exchanger source side pipeline arranged in the heat exchanger use side pipeline, and the temperature sensor is arranged on the heat exchanger use side pipeline.
4. A monitoring system according to claim 3, characterized in that: the heat exchange control system is a central air-conditioning control system or a heat pump control system, and the heat exchanger is any one of a coil type heat exchanger, a shell and tube type heat exchanger, a sleeve type heat exchanger and a plate type heat exchanger.
5. A monitoring system according to claim 3, characterized in that: the temperature detection device further comprises an indicator light, a buzzer and a display screen, wherein the indicator light, the buzzer and the display screen are respectively connected to the processor module.
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| CN201611076927.9A CN106440926B (en) | 2016-11-29 | 2016-11-29 | A kind of detection method and monitoring system of flow of heat exchange fluid |
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| CN201611076927.9A CN106440926B (en) | 2016-11-29 | 2016-11-29 | A kind of detection method and monitoring system of flow of heat exchange fluid |
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| CN106440926A CN106440926A (en) | 2017-02-22 |
| CN106440926B true CN106440926B (en) | 2018-12-07 |
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| CN115265241B (en) * | 2022-07-26 | 2025-04-04 | 杭州云酷智能科技有限公司 | A control method, system and computer-readable storage medium for the working state of a plate heat exchanger |
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| CN103292534A (en) * | 2013-05-30 | 2013-09-11 | 四川长虹电器股份有限公司 | Device and method for detecting flow rates of refrigerants |
| CN103361950A (en) * | 2012-03-30 | 2013-10-23 | 三星电子株式会社 | Clothing dryer and blockage detection method thereof |
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| KR101180207B1 (en) * | 2006-09-01 | 2012-09-10 | 엘지전자 주식회사 | Water Cooling Type Air Conditioner |
| CN104764146A (en) * | 2015-03-23 | 2015-07-08 | 广东美的暖通设备有限公司 | Control method, device and system for achieving water-side heat exchanger freeze-proofing protection |
| CN204612279U (en) * | 2015-04-27 | 2015-09-02 | 青岛海尔空调电子有限公司 | For warning device and the fouling auto-alarming heat exchanger of fouling of heat exchangers |
| CN105953483B (en) * | 2016-04-25 | 2018-11-20 | 广东美的暖通设备有限公司 | The abatement detecting method of multi-line system and its indoor unit restricting element |
| CN105954052B (en) * | 2016-05-27 | 2018-04-20 | 珠海格力电器股份有限公司 | Capillary tube blockage detection system and method |
| CN206258016U (en) * | 2016-11-29 | 2017-06-16 | 郭琦 | A kind of monitoring system of flow of heat exchange fluid |
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| CN103361950A (en) * | 2012-03-30 | 2013-10-23 | 三星电子株式会社 | Clothing dryer and blockage detection method thereof |
| CN103292534A (en) * | 2013-05-30 | 2013-09-11 | 四川长虹电器股份有限公司 | Device and method for detecting flow rates of refrigerants |
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