Heat exchanger temperature alternating test system and test method
By designing a heat exchanger temperature alternation test system and using bypass pipes and three-way devices to control the alternating switching of hot and cold fluids, the problem of insufficient fatigue resistance of heat exchangers under temperature alternation was solved, achieving efficient performance testing and energy saving.
Patent Information
- Application Number
- CN202510192122.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2045-02-21
AI Technical Summary
In the existing technology, heat exchangers are prone to thermal stress when switching between hot and cold fluids, resulting in insufficient fatigue resistance and a lack of effective temperature alternation test methods.
A heat exchanger temperature alternation test system was designed. By setting up multiple bypass pipes and three-way devices, the system uses switching valves to control the alternating entry of hot and cold fluids into the heat exchanger under test, and combines a sealed enclosure and a refrigerant detector to conduct the test.
This system enables effective testing of the fatigue resistance of heat exchangers under alternating temperature conditions. It features a simple system structure, reasonable testing methods, and the ability to detect heat exchanger failures in a timely manner, thereby reducing energy consumption.
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Figure CN119688351B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to heat exchanger temperature alternating test technical field, especially a kind of heat exchanger temperature alternating test system and testing method. BACKGROUND
[0002] Currently in heat pump and refrigeration system, four-way valve is generally used to switch the flow direction of working medium, so that the functions of evaporator and condenser are interchanged, to meet the energy demand of user in different time periods respectively refrigeration and heating.
[0003] However, in actual use, due to the alternating switching of cold and hot fluids, the working temperature of the heat exchanger will change within a certain range, and the heat exchanger will generate alternating thermal stress under certain temperature alternation, which will cause failure risk under thermal stress. Therefore, temperature alternating test needs to be carried out on the heat exchanger to test the temperature alternating fatigue resistance of the heat exchanger. SUMMARY
[0004] The present application is to overcome the defects in the prior art, and provides a heat exchanger temperature alternating test system, which can conveniently carry out temperature alternating test by connecting the refrigerant inlet and outlet of the heat exchanger to be tested to the second ends of the first bypass connection pipe and the second bypass connection pipe of the system, and can make the cold and hot fluids alternately switch into the heat exchanger to be tested by controlling the working state of the several switch valves to test its temperature alternating fatigue resistance. The present application also provides a method for carrying out temperature alternating test on the heat exchanger to be tested by using the above system.
[0005] To achieve the above-mentioned purpose, the present application provides a heat exchanger temperature alternating test system for testing the fatigue resistance of the heat exchanger to be tested under temperature alternating conditions, which comprises a compressor, a condenser, an expansion valve and an evaporator connected in sequence by pipelines to form a loop.
[0006] Among them, the pipeline between the high-temperature side of the refrigerant of the compressor and the condenser is provided with a first three-way device with adjusting function, and the pipeline between the low-temperature side of the refrigerant of the compressor and the evaporator is provided with a second three-way device with adjusting function.
[0007] The system further comprises a first bypass connection pipe, a second bypass connection pipe, a third bypass connection pipe and a fourth bypass connection pipe.
[0008] The first end of the first bypass connection pipe is connected to the third interface of the first three-way device, and a first constant temperature heater and a first switch valve are arranged in sequence thereon, and the second end of the first bypass connection pipe is used to connect the heat exchanger to be tested.
[0009] The first end of the second bypass connection pipe is connected to the pipeline between the first three-way device and the condenser, and a second switch valve is arranged thereon, and the second end of the second bypass connection pipe is used to connect the heat exchanger to be tested.
[0010] The first end of the third bypass pipe is connected to the third interface of the second three-way device and is provided with a second constant temperature heater and a third switch valve arranged in sequence, and the second end of the third bypass pipe is connected to the pipe section between the corresponding first switch valve and the second end of the first bypass pipe.
[0011] The first end of the fourth bypass pipe is connected to the pipeline between the second three-way device and the compressor and is provided with a fourth switch valve, and the second end of the fourth bypass pipe is connected to the pipe section between the corresponding second switch valve and the second end of the second bypass pipe.
[0012] Further provided is that a sealing box body for mounting the heat exchanger to be tested is further provided, and a refrigerant detector is arranged in the sealing box body.
[0013] Further provided is that a water storage tank, a circulating pump and an air-cooled radiator are connected between the water side of the evaporator and the water side of the condenser.
[0014] Further provided is that a fifth switch valve is arranged on the pipe section of the first bypass pipe between the connection position of the first bypass pipe and the third bypass pipe and the second end of the first bypass pipe, and a sixth switch valve is arranged on the pipe section of the second bypass pipe between the connection position of the second bypass pipe and the fourth bypass pipe and the second end of the second bypass pipe.
[0015] Further provided is that a first regulating pipe is connected between the pipe section of the first bypass pipe between the first constant temperature heater and the first switch valve and the pipe section of the second bypass pipe between the first end and the second switch valve, and a first regulating valve is arranged on the first regulating pipe.
[0016] Further provided is that a second regulating pipe is connected between the second end of the third bypass pipe and the second end of the fourth bypass pipe, and a second regulating valve is arranged on the second regulating pipe.
[0017] Further provided is that the first three-way device is a three-way regulating valve, a combination of a three-way valve and a regulating valve or a combination of a three-way regulating valve and a regulating valve.
[0018] Further provided is that the second three-way device is a three-way regulating valve, a combination of a three-way valve and a regulating valve or a combination of a three-way regulating valve and a regulating valve.
[0019] The application further provides a heat exchanger temperature alternating test method, which is implemented based on the heat exchanger temperature alternating test system.
[0020] Step one: connect the system to the heat exchanger to be tested and perform initialization detection;
[0021] Step two: start the circulating water system of the system and adjust the water flow to a given state;
[0022] Step three: open the heat pump system of the system to adjust the compressor suction temperature, exhaust temperature and refrigerant flow to the given state;
[0023] Step four: open the first and second constant temperature heaters, close the first, second, fifth and sixth switch valves, and adjust the cold and hot fluids to be connected to the measured heat exchanger to the specified state.
[0024] Step five: after the system moves stably, open the first, second, fifth and sixth switch valves, close the third and fourth switch valves, and connect the hot fluid to the measured heat exchanger to the specified time;
[0025] Step six: close the first and second switch valves, open the third and fourth switch valves, and connect the cold fluid to the measured heat exchanger to the specified time;
[0026] When step five and step six are completed, a test cycle is completed;
[0027] Continuously cycle step five and step six until the specified number of cycles is completed, and the test is terminated;
[0028] Alternatively, the measured heat exchanger fails, and the test is terminated.
[0029] Compared with the prior art, the test system of the present application has simple and reasonable structure, and can conveniently perform temperature alternation test by connecting the refrigerant inlet and outlet of the measured heat exchanger to the second ends of the first and second bypass pipes of the system. By controlling the working state of the several switch valves, the cold and hot fluids can be alternately switched into the measured heat exchanger to test its temperature alternation fatigue resistance. At the same time, the test method based on the above system also has the above advantages. BRIEF DESCRIPTION OF DRAWINGS
[0030] Figure 1 is a structural schematic diagram of a heat exchanger temperature alternation test system of the present application;
[0031] Figure 2 is a schematic diagram of the connection structure of the system corresponding to the high temperature fluid;
[0032] Figure 3 is a schematic diagram of the connection structure of the system corresponding to the low temperature fluid;
[0033] Figure 4 is a structural schematic diagram of a three-way device with adjustment function Figure 1 ;
[0034] Figure 5 is a structural schematic diagram of a three-way device with adjustment function Figure 2 .
[0035] The following reference signs are marked on the drawings in combination with the drawings:
[0036] 11, compressor; 12, condenser; 13, expansion valve; 14, evaporator; 15, first three-way device; 16, second three-way device; 21, first bypass pipe; 22, second bypass pipe; 23, first thermostatic heater; 24, first on-off valve; 25, second on-off valve; 31, third bypass pipe; 32, fourth bypass pipe; 33, second thermostatic heater; 34, third on-off valve; 35, fourth on-off valve; 41, water storage tank; 42, circulating pump; 43, air-cooled radiator; 51, to-be-tested heat exchanger; 52, sealed box; 53, refrigerant detector; 61, fifth on-off valve; 62, sixth on-off valve; 63, first regulating valve; 64, second regulating valve. DETAILED DESCRIPTION
[0037] One specific embodiment of the present application will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of protection of the present application is not limited by the specific embodiment.
[0038] A heat exchanger temperature alternating test system according to the present application is shown in Figures 1 to 3 and is used to test the fatigue resistance of a to-be-tested heat exchanger 51 under temperature alternating conditions. The system includes a compressor 11, a condenser 12, an expansion valve 13, an evaporator 14, a first bypass pipe 21, a second bypass pipe 22, a third bypass pipe 31 and a fourth bypass pipe 32. The compressor 11, the condenser 12, the expansion valve 13 and the evaporator 14 are connected in sequence by pipes to form a refrigerant circuit. The first ends of the first bypass pipe 21 and the second bypass pipe 22 are connected to a pipe between the high-temperature side of the compressor 11 and the condenser 12, and the second ends of the first bypass pipe 21 and the second bypass pipe 22 are used to be connected to the refrigerant inlet and outlet of the to-be-tested heat exchanger 51 respectively to form a first bypass path. The first ends of the third bypass pipe 31 and the fourth bypass pipe 32 are connected to a pipe between the low-temperature side of the compressor 11 and the evaporator 14, and the second ends of the third bypass pipe 31 and the fourth bypass pipe 32 are used to be connected to the refrigerant inlet and outlet of the to-be-tested heat exchanger 51 respectively to form a second bypass path.
[0039] In the embodiment, as Figures 1 to 3As shown, a first three-way device 15 with regulating function is arranged on the pipeline between the high-temperature side of the compressor 11 and the condenser 12, a first end of the first bypass pipeline 21 is connected to the third interface of the first three-way device 15 and a first constant-temperature heater 23 and a first switch valve 24 are arranged in sequence on the first end, a first end of the second bypass pipeline 22 is connected to the pipeline between the first three-way device 15 and the condenser 12 and a second switch valve 25 is arranged on the first end, so that the opening or closing of the first switch valve 24 and the second switch valve 25 can realize the connection or disconnection of the first bypass path and the refrigerant circuit. Figure 1 The first three-way device 15 is preferably a three-way regulating valve Figure 4 , a combination of a three-way valve and a regulating valve Figure 5 , or a combination of a three-way regulating valve and a regulating valve.
[0040] In the embodiment, as shown in Figures 1 to 3 , a second three-way device 16 with regulating function is arranged on the pipeline between the low-temperature side of the compressor 11 and the evaporator 14, a first end of the third bypass pipeline 31 is connected to the third interface of the second three-way device 16 and a second constant-temperature heater 33 and a third switch valve 34 are arranged in sequence on the first end, a first end of the fourth bypass pipeline 32 is connected to the pipeline between the second three-way device 16 and the compressor 11 and a fourth switch valve 35 is arranged on the first end, so that the opening or closing of the third switch valve 34 and the fourth switch valve 35 can realize the connection or disconnection of the second bypass path and the refrigerant circuit; the second three-way device 16 is used to regulate the distribution of the refrigerant flow on the second bypass path and the refrigerant circuit, and the second three-way device 16 is preferably a three-way regulating valve, a combination of a three-way valve and a regulating valve, or a combination of a three-way regulating valve and a regulating valve.
[0041] In the above scheme, preferably, a second end of the third bypass pipeline 31 is connected to the pipe section between the first switch valve 24 and the second end of the first bypass pipeline 21, and a second end of the fourth bypass pipeline 32 is connected to the pipe section between the second switch valve 25 and the second end of the second bypass pipeline 22, so that the to-be-tested heat exchanger 51 only needs to be connected to the second ends of the first and second bypass pipelines 22 to realize the connection of the to-be-tested heat exchanger 51 and the first and second bypass paths.
[0042] As shown in Figure 2As shown, by closing the third and fourth switch valves 35 and opening the first, second, fifth and sixth switch valves 62, the high-temperature fluid in the test system can flow into the heat exchanger 51 under test. The specific flow path of the high-temperature fluid is as follows: high-temperature side of compressor 11 → first three-way device 15 → first constant temperature heater 23 → first switch valve 24 → fifth switch valve 61 → heat exchanger 51 under test → sixth switch valve 62 → second switch valve 25 → condenser 12 → expansion valve 13 → evaporator 14 → second three-way device 16 → low-temperature side of compressor 11.
[0043] like Figure 3 As shown, by closing the first and second switch valves 25 and opening the third, fourth, fifth and sixth switch valves 62, the cryogenic fluid in the test system can flow into the heat exchanger 51 under test. The specific flow path of the cryogenic fluid is as follows: high temperature side of compressor 11 → first three-way device 15 → condenser 12 → expansion valve 13 → evaporator 14 → second three-way device 16 → second constant temperature heater 33 → third switch valve 34 → fifth switch valve 61 → heat exchanger 51 under test → sixth switch valve 62 → fourth switch valve 35 → low temperature side of compressor 11.
[0044] Such a system Figure 2 and Figure 3 The alternating switching between the two allows high-temperature fluid and low-temperature fluid to flow alternately into the heat exchanger 51 under test for temperature alternation test.
[0045] In this embodiment, the system also includes a sealed housing 52 with a sealed chamber. The heat exchanger 51 under test is installed in the sealed housing 52 and a high-precision refrigerant detector 53 for detecting refrigerant is provided inside it. If the refrigerant detector 53 detects refrigerant in the sealed housing 52, it indicates that the heat exchanger 51 under test has failed and leaked, and an alarm can be set so that timely handling can be carried out.
[0046] In this embodiment, a water storage tank 41, a circulation pump 42, and an air-cooled radiator 43 are connected between the water side of the evaporator 14 and the water side of the condenser 12. The condenser 12, the air-cooled radiator 43, the evaporator 14, the water storage tank 41, and the circulation pump 42 are connected to form a neutralization loop. This neutralization loop can neutralize the heat absorbed by the evaporator 14 and the heat released by the condenser 12, thus greatly reducing heat loss and saving the system's testing energy consumption.
[0047] In the embodiment, preferably, the fifth switch valve 61 is arranged on the end section of the first bypass pipe 21 corresponding to the second end, that is, the fifth switch valve 61 is arranged on the pipe section between the position where the first bypass pipe 21 is connected with the third bypass pipe 31 and the second end of the first bypass pipe 21; the sixth switch valve 62 is arranged on the end section of the second bypass pipe 22 corresponding to the second end, that is, the sixth switch valve 62 is arranged on the pipe section between the position where the second bypass pipe 22 is connected with the fourth bypass pipe 32 and the second end of the second bypass pipe 22; thus, the first heat exchanger 51 to be tested can be conveniently disassembled and assembled by closing the fifth and sixth switch valves 62.
[0048] In the embodiment, the first regulating pipe is connected between the pipe section between the first thermostatic heater 23 and the first switch valve 24 of the first bypass pipe 21 and the pipe section between the first end and the second switch valve 25 of the second bypass pipe 22, and the first regulating valve 63 is arranged on the first regulating pipe; the second regulating pipe is connected between the second end of the third bypass pipe 31 and the second end of the fourth bypass pipe 32, and the second regulating valve 64 is arranged on the second regulating pipe; thus, the distribution of the refrigerant flow can be further adjusted by the first regulating valve 63 and the second regulating valve 64.
[0049] The application further provides a heat exchanger temperature alternating test method, which is implemented based on the heat exchanger temperature alternating test system.
[0050] Step one: connecting the system with the heat exchanger to be tested and performing initialization detection;
[0051] Step two: starting the circulating water system of the system and adjusting the water flow to a given state;
[0052] Step three: starting the heat pump system of the system and adjusting the compressor suction temperature, discharge temperature and refrigerant flow to a given state;
[0053] Step four: starting the first thermostatic heater and the second thermostatic heater, closing the first, second, fifth and sixth switch valves, and adjusting the cold and hot fluids to be input into the heat exchanger to be tested to a given state;
[0054] Step five: after the system is stable, starting the first, second, fifth and sixth switch valves, closing the third and fourth switch valves, and inputting the hot fluid into the heat exchanger to be tested for a given time;
[0055] Step six: closing the first and second switch valves, starting the third and fourth switch valves, and inputting the cold fluid into the heat exchanger to be tested for a given time;
[0056] When the step five and the step six are completed, a test cycle is completed;
[0057] The step five and step six are continuously cycled until the specified cycle number is completed, the test is terminated, and it is indicated that the tested heat exchanger meets the temperature alternating fatigue resistance performance.
[0058] Alternatively, the tested heat exchanger is failed, the refrigerant detector alarms, and the test is terminated.
[0059] Thus, the temperature alternating fatigue resistance performance of the tested plate heat exchanger can be conveniently detected through the above test method.
[0060] Compared with the prior art, the test system of the present application has simple and reasonable structure, the temperature alternating test can be conveniently performed by connecting the refrigerant inlet and outlet of the tested heat exchanger to the second end of the first and second bypass connection pipes respectively, the cold and hot fluids can be alternately switched into the tested heat exchanger by controlling the working state of the several switch valves to test the temperature alternating fatigue resistance performance thereof, and the test method implemented based on the above system also has the above advantages.
[0061] The above disclosure is only an embodiment of the present application, but the present application is not limited thereto, and any change that can be thought of by those skilled in the art shall fall within the protection scope of the present application.
Claims
1. A heat exchanger temperature swing test system, characterized by, It is used for testing the anti-fatigue performance of the heat exchanger under temperature alternation condition, comprising a compressor, a condenser, an expansion valve and an evaporator connected in sequence through pipelines to form a loop; Wherein, a first three-way device with adjusting function is arranged on the pipeline between the high-temperature side of the compressor and the condenser, and a second three-way device with adjusting function is arranged on the pipeline between the low-temperature side of the compressor and the evaporator; The system further comprises a first bypass connecting pipe, a second bypass connecting pipe, a third bypass connecting pipe and a fourth bypass connecting pipe; The first end of the first bypass connecting pipe is connected to the third interface of the first three-way device, and a first constant temperature heater and a first switch valve are arranged in sequence on the first bypass connecting pipe, and the second end of the first bypass connecting pipe is used for connecting the heat exchanger to be tested; The first end of the second bypass connecting pipe is connected to the pipeline between the first three-way device and the condenser, and a second switch valve is arranged on the second bypass connecting pipe, and the second end of the second bypass connecting pipe is used for connecting the heat exchanger to be tested; The first end of the third bypass connecting pipe is connected to the third interface of the second three-way device, and a second constant temperature heater and a third switch valve are arranged in sequence on the third bypass connecting pipe, and the second end of the third bypass connecting pipe is connected to the pipeline segment between the first switch valve and the second end of the first bypass connecting pipe; The first end of the fourth bypass connecting pipe is connected to the pipeline between the second three-way device and the compressor, and a fourth switch valve is arranged on the fourth bypass connecting pipe, and the second end of the fourth bypass connecting pipe is connected to the pipeline segment between the second switch valve and the second end of the second bypass connecting pipe.
2. The heat exchanger temperature alternating test system of claim 1, wherein A sealed box body for mounting the heat exchanger to be tested is further included, and a refrigerant detector is arranged in the sealed box body.
3. The heat exchanger temperature alternating test system of claim 1, wherein A water storage tank, a circulating pump and an air-cooled radiator are connected between the water side of the evaporator and the water side of the condenser.
4. The heat exchanger temperature alternating test system of claim 1, wherein A fifth switch valve is arranged on the pipeline segment of the first bypass connecting pipe between the connection position of the first bypass connecting pipe and the third bypass connecting pipe and the second end of the first bypass connecting pipe, and a sixth switch valve is arranged on the pipeline segment of the second bypass connecting pipe between the connection position of the second bypass connecting pipe and the fourth bypass connecting pipe and the second end of the second bypass connecting pipe.
5. The heat exchanger temperature oscillation test system of claim 1, wherein A first regulating pipe is connected between the pipeline segment between the first constant temperature heater and the first switch valve of the first bypass connecting pipe and the pipeline segment between the first end and the second switch valve of the second bypass connecting pipe, and a first regulating valve is arranged on the first regulating pipe.
6. The heat exchanger temperature oscillation test system of claim 1, wherein A second regulating pipe is connected between the second end of the third bypass connecting pipe and the second end of the fourth bypass connecting pipe, and a second regulating valve is arranged on the second regulating pipe.
7. The heat exchanger temperature oscillation test system of claim 1, wherein The first three-way device is a three-way regulating valve, a combination of a three-way valve and a regulating valve, or a combination of a three-way regulating valve and a regulating valve.
8. The heat exchanger temperature oscillation test system of claim 1, wherein The second three-way device is a three-way regulating valve, a combination of a three-way valve and a regulating valve, or a combination of a three-way regulating valve and a regulating valve.
9. A heat exchanger temperature swing test method, characterized in that, It is implemented based on the heat exchanger temperature alternation test system of any one of claims 1-8, comprising the following steps: Step one: connecting the system with the heat exchanger to be tested and performing initial detection; Step two: starting the circulating water system of the system and adjusting the water flow to a given state; Step three: starting the heat pump system of the system to adjust the compressor suction temperature, discharge temperature and refrigerant flow to a given state; Step four: open the first and second constant temperature heaters, close the first, second, fifth and sixth switch valves, and adjust the cold and hot fluids to be connected to the to-be-tested heat exchanger to the specified state; Step five: after the system is stable, open the first, second, fifth and sixth switch valves, close the third and fourth switch valves, and connect the hot fluid to the to-be-tested heat exchanger for a specified time; Step six: close the first and second switch valves, open the third and fourth switch valves, and connect the cold fluid to the to-be-tested heat exchanger for a specified time; When steps five and six are completed, a test cycle is completed; Steps five and six are continuously cycled until a specified number of cycles is completed, and the test is terminated; Or, the to-be-tested heat exchanger fails, and the test is terminated.
Citation Information
Patent Citations
Temperature control device for rapid cold and thermal shock test
CN109916758A