CN216645746U - Pressure pulse test device - Google Patents
Pressure pulse test device Download PDFInfo
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- CN216645746U CN216645746U CN202123012740.1U CN202123012740U CN216645746U CN 216645746 U CN216645746 U CN 216645746U CN 202123012740 U CN202123012740 U CN 202123012740U CN 216645746 U CN216645746 U CN 216645746U
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Abstract
The application discloses a pressure pulse test device for electric heater, this pressure pulse test device includes: the liquid supply mechanism is used for providing a heat transfer medium; the first test flow path and the second test flow path are communicated with a heat transfer medium inlet of the liquid supply mechanism in parallel, and are respectively connected with at least one electric heater, a hydraulic pressure detector and an adjustable throttle valve in series in sequence along the flow direction of the heat transfer medium; a first reversing valve is connected between the first test flow path and the second test flow path and the heat transfer medium outlet of the liquid supply mechanism and is used for selecting the first test flow path or the second test flow path through the first reversing valve to form a first loop with the liquid supply mechanism; in the test process, the liquid supply mechanism continuously supplies heat transfer media, and the first test flow path or the second test flow path is sequentially switched by the first reversing valve to be communicated with the liquid supply mechanism so as to alternately perform pressure pulse tests on the electric heaters on the first test flow path and the second test flow path.
Description
Technical Field
The application relates to the field of detection, and more particularly relates to a pressure pulse test device for an electric heater.
Background
In new energy vehicles, in particular electric vehicles, the heating of the vehicle is usually effected by an electric heater via a heat transfer medium. Since a large number of electric circuits or electric components are included in the electric vehicle and it is necessary to maintain isolation from the heat transfer medium, the sealing performance of the electric heater is important.
Conventionally, before the electric heater is put into use, the sealing performance of the electric heater needs to be detected so as to test whether the sealing performance meets the use requirement. However, after long-term use, the change of the internal and external pressure of the electric heater may also cause the change of the sealing performance, thereby causing potential safety hazard.
Therefore, how to accurately test the fatigue resistance and reliability of the electric heater becomes a technical problem to be solved in the field.
SUMMERY OF THE UTILITY MODEL
In view of this, the present application provides a pressure pulse testing apparatus for an electric heater, so as to achieve efficient and accurate testing of fatigue resistance and reliability of the electric heater.
According to the application, a pressure pulse test device is provided, the pressure pulse test device comprising: a liquid supply mechanism for supplying a heat transfer medium; the first test flow path and the second test flow path are communicated with a heat transfer medium inlet of the liquid supply mechanism in parallel, and at least one electric heater, a hydraulic pressure detector and an adjustable throttle valve are sequentially connected in series on the first test flow path and the second test flow path along the flowing direction of the heat transfer medium respectively; a first reversing valve is connected between the first testing flow path and the second testing flow path and the heat transfer medium outlet of the liquid supply mechanism and is used for selecting the first testing flow path or the second testing flow path through the first reversing valve to form a first loop with the liquid supply mechanism; in the test process, the liquid supply mechanism continuously provides heat transfer media, the first reversing valve is used for sequentially switching the first test flow path or the second test flow path to be communicated with the liquid supply mechanism, and therefore the pressure pulse test is alternately carried out on the electric heaters on the first test flow path and the second test flow path.
Preferably, the first reversing valve is an electric control valve, or the first reversing valve is an air control valve controlled by an electromagnetic valve through an air path.
Preferably, a filter is disposed downstream of the adjustable throttle valve in a flow direction of the heat transfer medium for filtering impurities of the heat transfer medium.
Preferably, a check valve is provided downstream of the liquid supply mechanism and/or upstream of the electric heater on the first and second test flow paths.
Preferably, a pressure gauge and/or a flow meter is arranged between the liquid supply mechanism and the first reversing valve.
Preferably, the pressure pulse test device comprises an overflow valve, the overflow valve is communicated between a heat transfer medium inlet and a heat transfer medium outlet of the liquid supply mechanism, and the overflow valve is connected in parallel with the liquid supply mechanism in the first loop.
Preferably, an on-off flow path is arranged between the overflow valve and the liquid supply mechanism, and when the on-off flow path is connected, the liquid supply mechanism is directly communicated with the overflow valve to form a second loop.
Preferably, the liquid supply mechanism comprises a heat container for heating and storing the heat transfer medium and a first pump, the first pump is communicated between the heat container and the first reversing valve and is used for driving the heat transfer medium in the heat container to flow towards the first reversing valve; or the liquid supply mechanism comprises a coil, a heat exchanger and a second pump, the heat exchanger is arranged on the coil or adjacent to the coil and used for reducing the temperature of the heat transfer medium in the coil, and the second pump is communicated between the coil and the first reversing valve and used for driving the heat transfer medium in the coil to flow towards the first reversing valve.
Preferably, the pressure pulse test device comprises a plurality of groups of liquid supply mechanisms which are connected in parallel, the temperature of the heat transfer medium provided by the plurality of groups of liquid supply mechanisms is different, and at least one group of liquid supply mechanisms is communicated with the loop in the test process.
Preferably, the first test flow path and the second test flow path are selectively communicated with any one group of the liquid supply mechanisms through a second reversing valve respectively.
According to the technical scheme of the application, when the pressure pulse test device is used for detecting the electric heater of the vehicle, the inlet and the outlet of the flow channel cavities of the two electric heaters are respectively communicated with the first test flow channel and the second test flow channel. Under the condition that the liquid supply mechanism provides the heat transfer medium, the heat transfer medium enters the flow channel cavity of the electric heater through the first test flow path or the second test flow path, the heat transfer medium applies pressure to the flow channel cavity of the electric heater according to the size of the regulated flow after reaching the adjustable throttle valve, and the sealing condition of the flow channel cavity of the electric heater can be judged according to the change of the pressure value measured by the hydraulic pressure detector. The first reversing valve is used for controlling the switching of the heat transfer medium to the first test flow path and the second test flow path, so that the electric heaters on the two flow paths are tested respectively, the actual application scene of the electric heaters is simulated, the test efficiency is improved, and the anti-fatigue performance and the reliability of the electric heaters are tested efficiently and accurately.
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 view of a pressure pulse testing apparatus according to a preferred embodiment of the present application;
FIG. 2 is a schematic diagram of an embodiment of a liquid supply mechanism employing a thermal reservoir for a pressure pulse testing apparatus;
FIG. 3 is a schematic diagram of an embodiment of a liquid supply mechanism of a pressure pulse testing device using a heat exchange coil.
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.
In order to accurately test the fatigue resistance and reliability of the electric heater, the technical scheme of the application adopts a pressure pulse experiment on the electric heater, namely, the pulse pressure of fluid flow is utilized and is repeatedly applied to the sealing part of the electric heater so as to test the fatigue resistance and reliability of the detector. According to the use standard of the electric heater, the pulse test at least requires 25-60 times per minute, the cycle number is more than 20 ten thousand times, and higher requirements are provided for test equipment. According to the test requirement, the application provides a pressure pulse test device capable of realizing higher test frequency and higher pressure accuracy.
The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1, 2, and 3, the pressure pulse testing apparatus includes a liquid supply mechanism, a first test flow path S1, and a second test flow path S2. Wherein, the liquid supply mechanism is used for providing heat transfer media, such as water, cooling liquid and the like, which are used in the practical application of the electric heater, so as to simulate the real working environment as much as possible. The first test flow path S1 and the second test flow path S2 are communicated with a heat transfer medium inlet of the liquid supply mechanism in parallel, at least one electric heater, a hydraulic pressure detector 32 and an adjustable throttle valve 31 are sequentially connected in series on the first test flow path S1 and the second test flow path S2 in the flowing direction of the heat transfer medium respectively, and a first reversing valve 15 is connected between the first test flow path S1 and the second test flow path S2 and the heat transfer medium outlet of the liquid supply mechanism. The hydraulic pressure detector 32 is used for measuring the pressure of the fluid medium, and may be a pressure gauge, a hydraulic pressure detection sensor, or the like; the adjustable throttle valve 31 can be a manual or electric control valve, so that the fluid medium pressure at the upstream of the adjustable throttle valve 31 can be adjusted by controlling the valve opening of the adjustable throttle valve 31, and the pulse pressure applied to the electric heater can be flexibly controlled; the first direction valve 15 is used for selecting the first testing flow path S1 or the second testing flow path S2 to form a first loop with the liquid supply mechanism, and the first direction valve 15 may be an electric control valve, or the first direction valve 15 may be an air control valve operated by the electromagnetic valve 16 through an air path, or may be a manually controlled direction valve.
Because the liquid supply mechanism provides the heat transfer medium to reach the preset pulse pressure and needs a certain starting process, the working mode of the liquid supply mechanism is preferably uninterrupted continuous liquid supply to ensure the pressure stability under the high-frequency test. According to the pressure pulse test device, in the test process, the liquid supply mechanism continuously supplies heat transfer media, the first test flow path S1 or the second test flow path S2 is sequentially switched by the first reversing valve 15 to be communicated with the liquid supply mechanism, so that the pressure pulse tests are alternately carried out on the electric heaters on the first test flow path S1 and the second test flow path S2 respectively, the pressure pulse tests of the two electric heaters can be simultaneously realized according to the reversing frequency of the first reversing valve 15 under the condition that the pulse pressure is kept stable, the actual application scene of the electric heaters is highly simulated, the test efficiency is improved, and the fatigue resistance and the reliability of the electric heaters can be effectively and accurately tested.
In the experiment, the sealing condition of the runner cavity of the electric heater can be judged according to the pressure value change detected by the hydraulic detector 32, a liquid level detection device can be arranged in a liquid storage container (such as a water tank) of the liquid supply mechanism, and whether leakage exists in the test flow path or not can be judged through the liquid level change of the heat transfer medium stored in the liquid supply mechanism. Preferably, the pressure pulse testing device may further include an automatic response mechanism, such as an alarm or an automatic power switch, for triggering an alarm or automatically stopping the testing device according to a change in the measured value of the hydraulic pressure detector 32 or the liquid level detection device if there is a leak in the test flow path.
According to the pressure pulse test apparatus described above, the heat transfer medium forms a closed flow path in the first circuit formed by the first test flow path S1 or the second test flow path S2 and the liquid supply mechanism, and it is necessary to keep the heat transfer medium clean in order to improve the repeated test performance of the apparatus. As shown in fig. 1, 2 and 3, a filter 33 is preferably disposed downstream of the adjustable throttle valve 31 in the flow direction of the heat transfer medium for filtering impurities of the heat transfer medium to prevent external impurities from entering the liquid storage container of the liquid supply mechanism when the tested electric heater on the first test flow path S1 or the second test flow path S2 is replaced.
A check valve 11 is preferably provided in the flow path direction of the first circuit, downstream of the liquid supply mechanism, and/or upstream of the electric heater on the first test flow path S1 and the second test flow path S2. The check valve 11 is used for limiting the flow of the heat transfer medium supplied by the liquid supply mechanism to a predetermined direction, so that the heat transfer medium on the first test flow path S1 or the second test flow path S2 can be prevented from flowing back to the first direction change valve 15 or the heat transfer medium outlet of the liquid supply mechanism during the alternate direction change of the first direction change valve 15.
In order to improve the monitoring of the working state of the pressure pulse testing device, as shown in fig. 1 and 2, it is preferable that: the pressure gauge 17 is used for monitoring the hydraulic pressure of the heat transfer medium provided by the liquid supply mechanism in real time; and/or a flow meter 18, the flow meter 18 being adapted to monitor in real time the flow rate of the heat transfer medium supplied by the liquid supply mechanism. It will be appreciated that the pressure gauge and flow meter may be replaced by other monitoring devices known in the art for monitoring the supply of heat transfer medium to the liquid supply mechanism.
The tested electric heater and each working module in the test flow path can be damaged under the condition of excessive pressure impact, so the pressure pulse test device is preferably provided with an overflow mechanism to perform overflow pressure relief when the pressure of the heat transfer medium exceeds a threshold value in the test process. The overflow mechanism can be a pipe joint which can only bear limited hydraulic pressure, and when the hydraulic pressure exceeds the bearing range of the hydraulic pressure, the overflow mechanism automatically falls off to disconnect a pipeline so as to discharge the heat transfer medium; alternatively, a relief valve may be provided in the test circuit. As shown in fig. 1, 2 and 3, the overflow valve 14 is preferably connected between the heat transfer medium inlet and the heat transfer medium outlet of the liquid supply mechanism, and is connected in parallel with the liquid supply mechanism in the first circuit, so as to allow the heat transfer medium to return directly to the heat transfer medium inlet of the liquid supply mechanism through the overflow valve 14 when the pressure applied to the overflow valve 14 exceeds its set threshold. Furthermore, an on-off flow path 13 can be arranged between the overflow valve 14 and the liquid supply mechanism, and when the on-off flow path 13 is communicated, the liquid supply mechanism is directly communicated with the overflow valve 14 to form a second loop, so that the overflow performance of the overflow valve 14 is further improved.
In the pressure pulse testing device, the liquid supply mechanism at least needs to comprise a liquid storage container for storing the heat transfer medium and a pump for providing liquid outlet power. The liquid storage container can be a metal or nonmetal ordinary container with good sealing performance, or can test the fatigue resistance and the reliability of the electric heater in different temperature environments, and the liquid storage container preferably has a temperature adjusting function to a certain degree.
Fig. 2 shows a pressure pulse test apparatus according to a first embodiment of the present application, in which the liquid supply mechanism includes a heat container 10 for heating and storing a heat transfer medium and a first pump 12. The first pump 12 is connected between the heat container 10 and the first direction valve 15, and is used for driving the heat transfer medium in the heat container 10 to flow towards the first direction valve 15. In operation of the pressure pulse testing apparatus according to this embodiment, the first pump 12 pumps the heat transfer medium heated to a suitable temperature from the heat container 10, through the check valve 11, the pressure gauge 17 and the flow meter 18 to the first direction valve 15, and then through the first direction valve 15, through the first test flow path S1 or the second test flow path S2 back to the heat container 10 to complete a pulse test cycle for the electric heater on the first test flow path S1 or the second test flow path S2.
Fig. 3 shows a pressure pulse test apparatus according to a second embodiment of the present invention, in which a liquid supply mechanism includes a coil 20, a heat exchanger 21, and a second pump 22. The coil 20 may be used as the liquid storage container, or a part of the coil 20 is arranged in a container shape with a larger space, the heat exchanger 21 is arranged on the coil 20 or adjacent to the coil 20 for reducing the temperature of the heat transfer medium in the coil 20, and the second pump 22 is connected between the coil 20 and the first reversing valve 15 for driving the heat transfer medium in the coil 20 to flow toward the first reversing valve 15. In the pressure pulse testing device according to this embodiment, when the heat exchange function of the heat exchanger 21 reduces the temperature of the heat transfer medium in the coil 20 to a predetermined temperature, the second pump 22 provides a driving force to make the heat transfer medium flow from one end of the coil 20 to the first direction valve 15, and then the heat transfer medium is controlled by the first direction valve 15 to return to the other end of the coil 20 through the first testing flow path S1 or the second testing flow path S2, so as to complete a pulse testing cycle.
In the above embodiment, if the heat transfer medium generates excessive pressure during circulation, the relief function of the relief valve 14 is triggered, so that a part of the heat transfer medium does not participate in the circulation, but directly returns to the thermal container 10 or the coil 20 through the relief valve 14. It will be appreciated that the pressure pulse test apparatus may not only be provided with a set of liquid supply mechanisms, depending on the test requirements.
The pressure pulse test device also comprises a plurality of groups of liquid supply mechanisms which are connected in parallel, and the temperatures of the heat transfer media provided by the groups of liquid supply mechanisms are different. In the test process, at least one group of liquid supply mechanisms is communicated with the loop, so that the simulation of different temperature working conditions of the electric heater can be realized by switching different liquid supply mechanisms. According to the preferred embodiment of the present application, the first test flow path S1 and the second test flow path S2 of the pressure pulse testing device are selectively communicated with any one of the liquid supply mechanisms through the reversing connectors. The reversing connecting piece can be an electric control reversing valve, or an air control valve controlled by an air path, or can also be a manually controlled reversing valve, and preferably has at least two switchable flow path directions according to the reversing connecting piece so as to be capable of communicating at least two groups of liquid supply mechanisms for providing heat transfer media with different temperatures.
According to the third embodiment of the present invention, as shown in fig. 1, the direction change connector is the second direction change valve 34, and the first test flow path S1 and the second test flow path S2 are respectively connected to one second direction change valve 34 and selectively connected to the liquid supply mechanism described in the first embodiment and the second embodiment through the second direction change valve 34. In the same time, only one group of the two groups of liquid supply mechanisms can provide heat transfer media, and the other group does not work, so that the pulse test cycle of the first embodiment mode or the second embodiment mode is realized; or in the same time, the two groups of liquid supply mechanisms can work simultaneously, and under the synchronous switching of the first reversing valve 15 and the second reversing valve 34, the heat transfer media are alternately and respectively conveyed to the first test flow path S1 and the second test flow path S2, so that the fatigue resistance and the sealing reliability of the electric heater under the condition of continuous change of the simulated working temperature are realized.
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. Pressure pulse test device, its characterized in that, this pressure pulse test device includes:
a liquid supply mechanism for supplying a heat transfer medium; and
a first test flow path (S1) and a second test flow path (S2), the first test flow path (S1) and the second test flow path (S2) are communicated with the heat transfer medium inlet of the liquid supply mechanism in parallel, and at least one electric heater, a hydraulic pressure detector (32) and an adjustable throttle valve (31) are respectively connected in series on the first test flow path (S1) and the second test flow path (S2) in sequence along the flow direction of the heat transfer medium;
and a first reversing valve (15) is connected between the first testing flow path (S1) and the second testing flow path (S2) and the heat transfer medium outlet of the liquid supply mechanism, and is used for selecting the first testing flow path (S1) or the second testing flow path (S2) through the first reversing valve (15) to form a first circuit with the liquid supply mechanism.
2. The pressure pulse testing device according to claim 1, characterized in that the first direction valve (15) is an electrically controlled valve, or the first direction valve (15) is a pneumatically controlled valve operated by an electromagnetic valve (16) through a pneumatic circuit.
3. A pressure pulse testing device according to claim 1, characterized in that a filter (33) is arranged downstream of the adjustable throttle valve (31) in the flow direction of the heat transfer medium for filtering impurities of the heat transfer medium.
4. The pressure pulse testing apparatus of claim 1, wherein a check valve (11) is provided downstream of the liquid supply mechanism and/or upstream of the electric heater on the first and second test flow paths (S1, S2).
5. The pressure pulse testing device according to claim 1, characterized in that a pressure gauge (17) and/or a flow meter (18) is arranged between the liquid supply mechanism and the first reversing valve (15).
6. The pressure pulse test device according to claim 1, characterized in that the pressure pulse test device comprises a relief valve (14), the relief valve (14) is communicated between the heat transfer medium inlet and the heat transfer medium outlet of the liquid supply mechanism, and is connected with the liquid supply mechanism in parallel in the first circuit.
7. The pressure pulse test device according to claim 6, characterized in that an on-off flow path (13) is arranged between the overflow valve (14) and the liquid supply mechanism, and the on-off flow path (13) can directly communicate the liquid supply mechanism and the overflow valve (14) to form a second loop.
8. A pressure pulse testing device according to any of claims 1-7,
the liquid supply mechanism comprises a heat container (10) for heating and storing a heat transfer medium and a first pump (12), the first pump (12) is communicated between the heat container (10) and the first reversing valve (15) and is used for driving the heat transfer medium in the heat container (10) to flow towards the first reversing valve (15); or
The liquid supply mechanism comprises a coil (20), a heat exchanger (21) and a second pump (22), the heat exchanger (21) is arranged on the coil (20) or adjacent to the coil (20) and used for reducing the temperature of the heat transfer medium in the coil (20), and the second pump (22) is communicated between the coil (20) and the first reversing valve (15) and used for driving the heat transfer medium in the coil (20) to flow towards the first reversing valve (15).
9. The pressure pulse testing device according to claim 8, wherein the pressure pulse testing device comprises a plurality of groups of liquid supply mechanisms connected in parallel with each other, the liquid supply mechanisms of the groups supply heat transfer media with different temperatures, and at least one group of the liquid supply mechanisms is communicated with the loop.
10. The pressure pulse testing apparatus of claim 9, wherein said first test flow path (S1) and said second test flow path (S2) are selectively connectable to any set of said liquid supply mechanisms by a second diverter valve (34), respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123012740.1U CN216645746U (en) | 2021-11-30 | 2021-11-30 | Pressure pulse test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123012740.1U CN216645746U (en) | 2021-11-30 | 2021-11-30 | Pressure pulse test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216645746U true CN216645746U (en) | 2022-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123012740.1U Active CN216645746U (en) | 2021-11-30 | 2021-11-30 | Pressure pulse test device |
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| CN (1) | CN216645746U (en) |
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2021
- 2021-11-30 CN CN202123012740.1U patent/CN216645746U/en active Active
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