CN216284335U - Testing device of electric heater - Google Patents
Testing device of electric heater Download PDFInfo
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- CN216284335U CN216284335U CN202122986049.7U CN202122986049U CN216284335U CN 216284335 U CN216284335 U CN 216284335U CN 202122986049 U CN202122986049 U CN 202122986049U CN 216284335 U CN216284335 U CN 216284335U
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Abstract
The application discloses a testing device of an electric heater, which comprises a water tank, a liquid supply flow path and a liquid return flow path, wherein the liquid supply flow path is communicated from a liquid outlet of the water tank to an inlet of a flow channel cavity of the electric heater, and the liquid return flow path is communicated from an outlet of the flow channel cavity of the electric heater to a liquid inlet of the water tank; a pump is arranged at one end of the liquid supply flow path close to the water tank and is used for pumping the heat transfer medium in the water tank into a flow channel cavity of the electric heater along the liquid supply flow path; one end of the liquid supply flow path and the liquid return flow path, which is close to the electric heater, is provided with a temperature detection unit for measuring the temperature of the heat transfer medium flowing into and out of the flow channel cavity of the electric heater in real time; and a heat exchanger is arranged on the extending route of the liquid return flow path and is used for cooling the heat transfer medium in the liquid return flow path. According to the technical scheme of this application, can high-efficient measurement electric heater's performance.
Description
Technical Field
The present application relates to the field of testing, and more particularly, to a testing apparatus for testing the performance of an electric heater.
Background
The whole vehicle heat supply of new energy vehicles, especially electric vehicles, is usually provided by electric heaters, and the working performance of the electric heaters is an important index of the electric vehicles, so the detection of the performance of the electric heaters is particularly important.
Testing of electric heaters typically requires simulating their operating environment to obtain more accurate measurement parameters. For example, the heating power of the electric heater needs to be measured under the condition that the heat transfer medium is reserved in the flow channel cavity of the electric heater. The traditional test process generally comprises the steps that a heater starts to heat purified water in a water tank until the water temperature in the water tank reaches a designed temperature control switch value, then the heater stops, and the water temperature is naturally cooled and restarted after the water temperature is reduced to the starting temperature of the temperature control switch. This process can result in wasted time and affect the accuracy of the factory test of the heater.
Therefore, how to provide an electric heater testing device with complete functions and adjustable and controllable water flow and water temperature becomes a technical problem to be solved in the field.
SUMMERY OF THE UTILITY MODEL
In view of this, the present application provides a testing apparatus for detecting the performance of an electric heater, so as to implement a testing scheme of an electric heater with complete functions and adjustable and controllable water flow and water temperature.
According to the application, the testing device of the electric heater comprises a water tank, a liquid supply flow path and a liquid return flow path, wherein the liquid supply flow path is communicated from a liquid outlet of the water tank to an inlet of a flow channel cavity of the electric heater, and the liquid return flow path is communicated from an outlet of the flow channel cavity of the electric heater to a liquid inlet of the water tank; a pump is arranged at one end of the liquid supply flow path close to the water tank and used for pumping the heat transfer medium in the water tank into a flow channel cavity of the electric heater along the liquid supply flow path; one end of the liquid supply flow path and one end of the liquid return flow path, which are close to the electric heater, are provided with temperature detection units for measuring the temperature of the heat transfer medium flowing into and out of the flow channel cavity of the electric heater in real time; and a heat exchanger is arranged on the extending route of the liquid return flow path and is used for cooling the heat transfer medium in the liquid return flow path.
Preferably, the heat exchanger is a container communicated with a cooling flow path, the liquid return flow path extends through the inside of the heat exchanger and is not communicated with the cooling flow path, and the heat transfer medium in the liquid return flow path exchanges heat with the cooling medium in the heat exchanger when passing through the heat exchanger.
Preferably, a flow regulating valve is arranged on the liquid supply pipeline and used for regulating the flow of the heat transfer medium flowing into the flow channel cavity of the electric heater.
Preferably, the liquid return flow path is provided with a flow meter for measuring the flow rate of the heat transfer medium flowing out of the flow path cavity of the electric heater in real time.
Preferably, a pressure gauge for measuring the liquid pressure of the heat transfer medium is arranged between the pump and the flow regulating valve on the liquid supply path.
Preferably, the liquid supply flow path and/or the liquid return flow path are provided with a filter capable of filtering impurities in the heat transfer medium, and the filter is used for preventing impurities deposited in the water tank from flowing into the flow channel cavity of the electric heater along the liquid supply flow path and/or preventing impurities in the electric heater from flowing out of the flow channel cavity of the electric heater along the liquid return flow path and generating deposited impurities in the water tank.
Preferably, a first direction change valve for selectively opening the liquid supply flow path or for closing the liquid supply flow path and causing the heat medium to flow into the tank along a first sub flow path is provided on the liquid supply flow path downstream of the pump; and/or a second reversing valve is arranged on the liquid return flow path and at the upstream of the heat exchanger, and the second reversing valve is used for selectively connecting the liquid return flow path or cutting off the liquid return flow path and enabling the heat transfer medium to flow into the water tank along a second secondary flow path.
Preferably, the first direction valve and/or the second direction valve is an electromagnetic direction valve or a pneumatic direction valve.
Preferably, the testing device comprises a gas supply path, wherein the gas supply path is connected to the inlet of the flow channel cavity of the electric heater and used for blowing gas to the electric heater to empty the heat transfer medium in the electric heater when the liquid supply path stops supplying the heat transfer medium to the electric heater; the gas supply air path and the liquid supply flow path are respectively provided with a one-way valve for preventing the heat transfer medium from entering the gas supply air path and preventing the gas from entering the liquid supply flow path.
Preferably, the testing device comprises a control gas circuit, the control gas circuit and the gas supply gas circuit are connected in parallel to a gas source, the first reversing valve and the second reversing valve are pneumatic control valves, and the control gas circuit is used for controlling the first reversing valve and the second reversing valve to act simultaneously or respectively.
According to the technical scheme of this application, the heat transfer medium that the water tank provided is measured real-time temperature by different temperature monitoring unit respectively before and after getting into electric heater to obtain more accurate measured value. The heat transfer medium in the liquid return flow path is cooled through the heat exchanger before returning to the water tank, so that the temperature of the heat transfer medium in the water tank is prevented from rising, and the electric heater can be detected for a longer time.
Additional features and advantages of the present application will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate an embodiment of the invention and, together with the description, serve to explain the invention. In the drawings:
FIG. 1 is a schematic flow path diagram of a test apparatus for an electric heater according to a preferred embodiment of the present application;
fig. 2 is a schematic diagram of a flow path and a gas path of the testing device of the electric heater.
Detailed Description
The terms "upstream" and "downstream" and the like are used herein to describe the directions of the flow paths shown in the drawings, and refer to the upstream direction and the downstream direction in the flow direction of the fluid medium. It should be understood that the above directional terms are used for clearly indicating the relative position relationship of the technical solutions of the present application, and therefore, the above directional terms do not limit the protection scope of the present application.
An electric heater of a new energy vehicle (such as an electric vehicle, a hybrid vehicle and the like) generally bears heat supply (such as an air conditioning system) of the whole vehicle, so that the control of the performance of the electric heater is particularly important. The test of electric heater usually needs to go on under heat-transfer medium flows to simulate its actual work condition, and require that parameters such as flow, temperature are adjustable controllable, this application provides the testing arrangement of electric heater that can satisfy above condition to a certain extent.
The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The testing device of the electric heater comprises a water tank 11, a liquid supply flow path 10 and a liquid return flow path 20. As shown in fig. 1, the liquid supply flow path 10 is communicated from the liquid outlet of the water tank 11 to the inlet of the flow channel cavity of the electric heater S, and the liquid return flow path 20 is communicated from the outlet of the flow channel cavity of the electric heater S to the liquid inlet of the water tank 11, so that the electric heater S, the water tank 11, the liquid supply flow path 10 and the liquid return flow path 20 form a test flow path of a closed cycle. Wherein, a pump 12 is disposed at one end of the liquid supply path 10 close to the water tank 11, and is used for pumping the heat transfer medium in the water tank 11 into the flow channel cavity of the electric heater S along the liquid supply path 10, and the heat transfer medium may be a common heat transfer fluid, such as water, automobile coolant, and the like. When the pump 12 is operated, the heat transfer medium in the water tank 11 enters the flow channel cavity of the electric heater S through the liquid supply flow path 10 to be heated by the electric heater, and the heated heat transfer medium flows from the outlet of the flow channel cavity to the liquid inlet of the water tank 11 through the liquid return flow path 20. In this process, the heating power of the electric heater S can be tested by comparing the temperature change of the heat transfer medium entering and exiting the flow channel chamber of the electric heater S.
The temperature of the heat transfer medium flowing into and out of the flow path chamber of the electric heater S can be detected by temperature detection units provided at arbitrary positions on the liquid supply flow path 10 and the liquid return flow path 20. The temperature detecting unit is preferably located close to the inlet and outlet of the flow channel chamber of the electric heater S to reduce the influence of the environmental heat exchange on the test result. As shown in fig. 1, a temperature detecting unit 13 is disposed at one end of the liquid supply path 10 and the liquid return path 20 close to the electric heater S, and is used for measuring the temperature of the heat transfer medium flowing into and out of the flow path chamber of the electric heater S in real time, and judging that the electric heater S is heating efficiency according to comparison of the measured values of the temperature detecting unit 13 at different positions.
In the above-described electric heater test apparatus, the heat transfer medium flowing along the return flow path 20 to the tank 11 after being heated by the electric heater S has an increased average temperature of the heat transfer medium stored in the tank after entering the tank 11, and therefore, in order to improve the retest performance of the measurement apparatus, as shown in fig. 1, a heat exchanger 31 is preferably provided on the extended route of the return flow path 20, the heat exchanger 31 being used for cooling the heat transfer medium in the return flow path 20. The heat exchanger 31 may be an air-cooled or water-cooled heat exchanger, and preferably, the heat exchanger 31 is a container communicated with the cooling flow path 30, the liquid return flow path 20 extends through the inside of the heat exchanger 31 and is not communicated with the cooling flow path 30, and when the heat transfer medium in the liquid return flow path 20 passes through the heat exchanger 31, the heat transfer medium exchanges heat with the low-temperature cooling medium in the heat exchanger 31. The tube sections of the return flow path 20 extending inside the heat exchanger 31 are preferably curved or spirally distributed to increase the contact area and improve the heat dissipation efficiency of the heat transfer medium in the tube sections.
The cooling flow path 30 may be connected to an open flow path, such as a tap water pipe using tap water as a cooling medium, or may be connected to a closed flow path provided with an evaporator to continuously supply the cooling medium cooled by the evaporator. As shown in fig. 1, the flow rate of the cooling medium of the cooling flow path 30 is preferably adjustable to maintain the temperature of the heat transfer medium in the water tank constant by changing the cooling efficiency by adjusting the flow rate of the cooling medium according to the temperature value at which the heat transfer medium is heated by the electric heater S. A filter is preferably disposed upstream of the container in the cooling flow path 30 to prevent impurities from entering the container and adhering to the outer wall of the pipe line of the return flow path 20 to affect the heat exchange efficiency thereof.
To test the operation of the electric heater at different flow rates, the flow rate of the heat transfer medium to the electric heater S is preferably adjustable. The adjustment of the flow rate may be performed by adjusting the operating power of the pump 12, or as shown in fig. 1, the liquid supply path 10 is preferably provided with a flow control valve 14, and the flow control valve 14 is used to adjust the flow rate of the heat transfer medium flowing into the flow path chamber of the electric heater S. The liquid return flow path 20 may further be provided with a flow meter 21 for measuring the flow rate of the heat transfer medium flowing out of the flow path chamber of the electric heater S in real time, so as to determine the flowing condition of the heat transfer medium, such as whether there is a leakage in the test flow path, especially the electric heater S, according to the flow rate of the heat transfer medium flowing into and out of the electric heater S. On the liquid supply flow path 10, a pressure gauge 15 for measuring the liquid pressure of the heat transfer medium is preferably provided between the pump 12 and the flow regulating valve 14, so that when the flow regulating valve 14 limits a small flow rate, which results in a large hydraulic pressure of the heat transfer medium between the pump 12 and the flow regulating valve 14, a worker can adjust the working state of the testing device according to the value displayed by the pressure gauge 15 to prevent the damage of the components.
When a different electrical heater S to be tested is replaced, impurities (such as dust in the air or material residues left during the process of the electrical heater S) may enter the test flow path. As shown in fig. 1, the liquid supply path 10 and/or the liquid return path 20 of the testing device of the electric heater are preferably provided with a filter 16 capable of filtering impurities in the heat transfer medium, so as to reduce the impurities in the testing path and improve the repeated working capacity of the testing device. The impurities in the heat transfer medium are filtered by the filter 16, so that the impurities deposited in the water tank 11 can be prevented from flowing into the flow passage cavity of the electric heater S along the liquid supply flow passage 10, and/or the impurities in the electric heater S can be prevented from flowing out of the flow passage cavity of the electric heater S along the liquid return flow passage 20 and generating deposited impurities in the water tank 11, and the impurities in the original electric heater S can be removed after the heat transfer medium is flushed, so that the cleaning effect is achieved.
According to the electric heater test apparatus described above, when the test is to be stopped, it is difficult to immediately stop the operation due to the operation inertia of the pump 12, and since the local hydraulic pressure may be increased by forcibly closing the flow path, it is preferable that the first sub-flow path 101 is further connected to the liquid supply flow path 10. Preferably, as shown in fig. 2, a first direction change valve 17 is provided downstream of the pump 12, and the first direction change valve 17 is used for selectively switching on the liquid supply flow path 10 or for switching off the liquid supply flow path 10 and allowing the heat medium to flow into the tank 11 along the first sub flow path 101. According to the first sub-flow path 101, when the supply of the heat transfer medium to the electric heater S needs to be stopped, the testing device of the electric heater can guide the heat transfer medium output from the pump 12 to the return tank 11 along the first sub-flow path 101 through the first reversing valve 17, thereby immediately stopping the supply of the heat transfer medium to the electric heater S.
On the other hand, the second direction changing valve 27 may be provided upstream of the heat exchanger 31 in the return flow path 20. As shown in fig. 2, the second direction valve 27 has one side connected to the outlet of the flow path chamber of the electric heater S and the other side switchably connected to the return flow path 20 or the second sub flow path 201. When the test device for the electric heater described above performs the test operation, the second direction changing valve 27 selectively connects to the liquid return flow path 20, and the heat transfer medium heated by the electric heater S passes through the second direction changing valve 27, is cooled by the heat exchanger 31, and then returns to the water tank 11. In a special condition, for example, when the heat transfer medium is not required to be cooled down or the flow channel chamber inlet of the electric heater S is not required to be pressurized to remove the heat transfer medium in the flow channel chamber, the second direction valve 27 is used to cut off the liquid return flow channel 20 and allow the heat transfer medium to flow into the water tank 11 along the second sub-flow channel 201, so that the heat transfer medium can be returned to the water tank 11 more quickly, thereby improving the heat transfer medium return efficiency.
In the above embodiment, the first direction valve 17 and/or the second direction valve 27 may be a manual direction valve with low cost, or an electromagnetic direction valve or a pneumatic direction valve with high performance efficiency. Considering that the heat transfer medium used for testing the electric heater may be an electrically conductive liquid, the first and second directional valves 17 and 27 for the heat transfer medium lines are preferably pneumatically controlled valves to isolate the heat transfer medium from the electrically controlled components and prevent electrical leakage. The control air circuit 50 for controlling the first direction valve 17 and the second direction valve 27 may be configured to simultaneously supply air to the first direction valve 17 and the second direction valve 27, or configured to separately supply air to one of the first direction valve 17 and the second direction valve 27, so as to simultaneously or separately control the first direction valve 17 and the second direction valve 27. The first reversing valve 17 and the second reversing valve 27 which are pneumatically controlled can be one-way valves, namely valve cores of the first reversing valve 17 and the second reversing valve 27 are positioned at valve positions on one side under the action of elastic members when air is not supplied, and the valve positions are switched by overcoming elastic force when air is supplied; or the first direction changing valve 17 and the second direction changing valve 27 are two-way valves, and the control air path 50 changes the valve positions by changing the air supply direction to the first direction changing valve 17 and the second direction changing valve 27 to push the valve cores thereof.
In the test device of the electric heater according to the preferred embodiment of the present application, the test device further has a cleaning function for the flow channel cavity of the electric heater S, so that the heat transfer medium remaining in the flow channel cavity can be removed after the test is completed, and the reuse efficiency of the test device can be improved. As shown in fig. 2, the testing apparatus for an electric heater includes a gas supply path 40, the gas supply path 40 is connected to the inlet of the flow channel chamber of the electric heater S, and is used for blowing gas to the electric heater S to exhaust the heat transfer medium in the electric heater S when the liquid supply path 10 stops supplying the heat transfer medium to the electric heater S. The gas supply path 40 and the liquid supply path 10 are preferably provided with a check valve 41 respectively for preventing the heat transfer medium from entering the gas supply path 40 and preventing the gas from entering the liquid supply path 10. The air source of the air supply circuit 40 may be provided separately from the air source of the control circuit 50, or preferably, the control circuit 50 and the air supply circuit 40 of the testing device are connected in parallel to the air source.
According to the testing device of the electric heater in the preferred embodiment, when the tested electric heater S is connected, the heat transfer medium is driven by the pump 12 to flow from the water tank 11 to the flow passage cavity of the electric heater S along the liquid supply flow passage 10, and after being heated in the flow passage cavity, the heat transfer medium returns to the water tank along the liquid return flow passage 20. The flow rate of the heat transfer medium is controlled by the flow rate regulating valve 14, the heating efficiency of the heat transfer medium is tested by measuring the temperature of the heat transfer medium before and after the heat transfer medium passes through the electric heater S by the temperature detection unit 13, the cleanness in the test flow path is kept by the filter 16 on the liquid supply flow path 10 and the liquid return flow path 20, and the temperature of the heat transfer medium supplied by the water tank 11 in the test process is kept stable by the cooling flow path 30 and the heat exchanger 31. After the test is finished, the pump 12 is closed, the control air circuit 50 controls the first reversing valve 17 and the second reversing valve 27 to be switched simultaneously, so that the heat transfer medium driven by inertia of the pump 12 directly returns to the water tank 11 along the first auxiliary flow path 101, and the second reversing valve 27 is switched to the second auxiliary flow path 201; at the same time, the air supply path 40 is turned on, and the air pressure discharges the heat medium remaining in the electric heater S to the water tank 11 along the second sub-flow path 201, thereby rapidly removing the heat medium in the electric heater S.
The preferred embodiments of the present application have been described in detail above, but the present application is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present application within the technical idea of the present application, and these simple modifications all belong to the protection scope of the present application.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described in the present application.
In addition, any combination of the various embodiments of the present application is also possible, and the same should be considered as disclosed in the present application as long as it does not depart from the idea of the present application.
Claims (10)
1. The testing device of the electric heater comprises a water tank (11), a liquid supply flow path (10) and a liquid return flow path (20), wherein the liquid supply flow path (10) is communicated from a liquid outlet of the water tank (11) to an inlet of a flow channel cavity of the electric heater (S), and the liquid return flow path (20) is communicated from an outlet of the flow channel cavity of the electric heater (S) to a liquid inlet of the water tank (11); it is characterized in that the preparation method is characterized in that,
a pump (12) is arranged at one end, close to the water tank (11), of the liquid supply flow path (10) and used for pumping heat transfer media in the water tank (11) into a flow channel cavity of the electric heater (S) along the liquid supply flow path (10);
one end of the liquid supply flow path (10) and one end of the liquid return flow path (20) close to the electric heater (S) are provided with temperature detection units (13) for measuring the temperature of the heat transfer medium flowing into and out of the flow channel cavity of the electric heater (S) in real time;
and a heat exchanger (31) is arranged on the extending route of the liquid return flow path (20), and the heat exchanger (31) is used for cooling the heat transfer medium in the liquid return flow path (20).
2. The electric heater testing device according to claim 1, wherein the heat exchanger (31) is a container communicating with a cooling flow path (30), the return flow path (20) extends through an inside of the heat exchanger (31) and does not communicate with the cooling flow path (30),
the heat transfer medium in the liquid return flow path (20) exchanges heat with the cooling medium in the heat exchanger (31) when passing through the heat exchanger (31).
3. The testing device of the electric heater according to claim 1, wherein a flow regulating valve (14) is disposed on the liquid supply flow path (10), and the flow regulating valve (14) is used for regulating the flow of the heat transfer medium flowing into the flow path cavity of the electric heater (S).
4. The electric heater test device according to claim 3, wherein the liquid return flow path (20) is provided with a flow meter (21) for measuring the flow amount of the heat transfer medium flowing out of the flow path chamber of the electric heater (S) in real time.
5. The test device of the electric heater according to claim 3, wherein a pressure gauge (15) for measuring a liquid pressure of the heat transfer medium is provided on the liquid supply flow path (10) between the pump (12) and the flow rate adjusting valve (14).
6. The testing device of the electric heater according to claim 1, wherein the liquid supply flow path (10) and/or the liquid return flow path (20) is provided with a filter (16) capable of filtering impurities in the heat transfer medium,
the filter (16) is used for preventing impurities deposited in the water tank (11) from flowing into a flow channel cavity of the electric heater (S) along the liquid supply flow path (10) and/or preventing impurities in the electric heater (S) from flowing out of the flow channel cavity of the electric heater (S) along the liquid return flow path (20) and generating deposited impurities in the water tank (11).
7. The electric heater testing device according to any one of claims 1 to 6,
a first direction change valve (17) is arranged on the liquid supply flow path (10) and at the downstream of the pump (12), and the first direction change valve (17) is used for selectively connecting the liquid supply flow path (10) or cutting off the liquid supply flow path (10) and enabling the heat transfer medium to flow into the water tank (11) along a first auxiliary flow path (101); and/or
A second direction change valve (27) is provided upstream of the heat exchanger (31) in the liquid return passage (20), and the second direction change valve (27) is used for selectively connecting the liquid return passage (20) or cutting off the liquid return passage (20) to allow the heat transfer medium to flow into the tank (11) along a second sub passage (201).
8. Testing device of an electric heater according to claim 7, characterized in that the first direction valve (17) and/or the second direction valve (27) is an electromagnetic direction valve or a pneumatic direction valve.
9. The electric heater testing apparatus of claim 7,
the testing device comprises an air supply circuit (40), wherein the air supply circuit (40) is connected to the inlet of the flow channel cavity of the electric heater (S) and used for blowing air to the electric heater (S) when the liquid supply flow path (10) stops supplying heat transfer media to the electric heater (S) so as to exhaust the heat transfer media in the electric heater (S);
the gas supply air path (40) and the liquid supply flow path (10) are respectively provided with a one-way valve (41) for preventing the heat transfer medium from entering the gas supply air path (40) and preventing the gas from entering the liquid supply flow path (10).
10. The testing device of the electric heater according to claim 9, characterized in that the testing device comprises a control gas circuit (50), the control gas circuit (50) and the gas supply gas circuit (40) are connected in parallel with a gas source,
the first reversing valve (17) and the second reversing valve (27) are pneumatic control valves, and the control air circuit (50) is used for controlling the first reversing valve (17) and the second reversing valve (27) to act simultaneously or respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122986049.7U CN216284335U (en) | 2021-11-30 | 2021-11-30 | Testing device of electric heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122986049.7U CN216284335U (en) | 2021-11-30 | 2021-11-30 | Testing device of electric heater |
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| Publication Number | Publication Date |
|---|---|
| CN216284335U true CN216284335U (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122986049.7U Active CN216284335U (en) | 2021-11-30 | 2021-11-30 | Testing device of electric heater |
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| CN (1) | CN216284335U (en) |
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2021
- 2021-11-30 CN CN202122986049.7U patent/CN216284335U/en active Active
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