Built-in sensor sealing detection device and method

Abstract

The present invention provides a device and method for detecting the sealing performance of a built-in sensor. The device includes: a base; a test bench, which is arranged on the base; a vacuum pump, which is connected to the test bench; an oil pump, which is connected to the test bench; a pressure gauge, which is connected to the test bench and is used to detect and display the pressure value in the test bench in real time, so as to obtain the pressure value of the sensor to be tested, and then perform positive and negative pressure sealing performance tests on the sensor to be tested according to the change of the pressure value. The present invention uses a vacuum pump to evacuate the test bench so that the test bench is in a negative pressure state, and then the sensor to be tested is in a negative pressure environment; uses an oil pump to inject oil and pressurize so that the test bench is in a positive pressure state, and then the sensor to be tested is in a positive pressure environment, so as to detect the sealing performance of the built-in sensor according to the change of the pressure gauge pressure value recorded within a specified time, and judge whether the negative pressure sealing performance of the sensor to be tested is qualified.

Description

Technical Field

[0001] The present invention relates to the field of sensor technology, and in particular to a device and method for detecting the sealing performance of a built-in sensor. Background Art

[0002] Ultra-high frequency detection of partial discharge of transformers and GIS is one of the effective detection methods. As an important component of built-in detection devices or devices of important equipment such as transformers, the sealing of built-in ultra-high frequency sensors directly affects the operating status of transformers and GIS. The sealing of built-in ultra-high frequency sensors is one of the important factors to ensure the normal operation of important equipment such as transformers. If the sealing of the sensor is unqualified and leakage occurs, it will cause equipment damage or production accidents. Therefore, the sealing test is one of the test items for the performance test of sensors before leaving the factory, and it is increasingly valued by sensor manufacturers and operation departments.

[0003] The purpose of the built-in UHF sensor sealing test is to detect the sealing of the sensor to be tested, and to judge whether the tested sensor is qualified by observing the pressure value change of the sensor to be tested within a specified time.

[0004] At present, the existing traditional sensor sealing detection device can only apply positive pressure or negative pressure to the sensor to be tested, which will make the detection test limited and the function is not comprehensive enough. It will also have a certain impact on the test results and cannot meet the test requirements of the built-in UHF sensor sealing detection. In view of the above situation, it is very necessary to develop a UHF built-in sensor sealing detection device that can perform both positive pressure test, i.e. oil pressure test, and negative pressure test on the built-in UHF sensor. Summary of the invention

[0005] In view of this, the present invention proposes a built-in sensor sealing detection device and method, aiming to solve the problem that the existing sensor sealing detection device has limitations and cannot meet the requirements of the built-in UHF sensor sealing detection test.

[0006] On the one hand, the present invention proposes a built-in sensor sealing detection device, which includes: a base; a test bench, which is arranged on the base and is used to provide a built-in closed detection environment for the sensor to be tested; a vacuum pump, which is connected to the test bench and is used to evacuate the test bench to put it in a negative pressure state, thereby putting the sensor to be tested in a negative pressure environment; an oil pump, which is connected to the test bench and is used to inject oil and pressurize the test bench to put it in a positive pressure state, thereby putting the sensor to be tested in a positive pressure environment; a pressure gauge, which is connected to the test bench and is used to detect and display the pressure value in the test bench in real time, so as to obtain the pressure value of the sensor to be tested, and then perform positive and negative pressure sealing tests on the sensor to be tested according to the change of the pressure value.

[0007] Furthermore, in the above-mentioned built-in sensor sealing detection device, the vacuum pump and the test bench are connected through a vacuum pipe, and the vacuum pipe is provided with a vacuum valve for controlling the opening and closing of the vacuum pipe.

[0008] Furthermore, in the above-mentioned built-in sensor sealing detection device, the oil pump and the test bench are connected through an oil pressure pipeline, and the oil pressure pipeline is provided with a vacuum valve for controlling the opening and closing of the oil pressure pipeline.

[0009] Furthermore, in the above-mentioned built-in sensor sealing detection device, the test bench is provided with a mounting hole, and a transition flange is provided at the mounting hole for connecting the sealing flange and the sensor flange, so that the sensor to be tested can be built-in and installed in the test bench.

[0010] Furthermore, in the above-mentioned built-in sensor sealing detection device, there are multiple test benches, and each of the test benches is independent of each other, so as to independently perform positive pressure or negative pressure sealing detection on multiple sensors to be tested.

[0011] Furthermore, the above-mentioned built-in sensor sealing detection device also includes: a control panel, which is connected to the vacuum pump and the oil pump respectively, and is used to control the start and stop of the vacuum pump and the oil pump.

[0012] Furthermore, in the above-mentioned built-in sensor sealing detection device, the test bench is connected with an oil drain valve and an exhaust valve.

[0013] Furthermore, in the above-mentioned built-in sensor sealing detection device, the vacuum valve is a mixed stop valve.

[0014] Furthermore, in the above-mentioned built-in sensor sealing detection device, the test bench is made of stainless steel.

[0015] On the other hand, the present invention proposes a built-in sensor sealing detection method, using the above-mentioned built-in sensor sealing detection device to perform positive pressure sealing detection and negative pressure sealing detection; wherein, the negative pressure sealing detection is specifically: the sensor to be tested is installed on the test bench in a built-in manner, and the test bench is evacuated by a vacuum pump until the pressure gauge set on the test bench displays a pressure lower than the preset negative pressure, the first vacuum value of the pressure gauge is obtained after a first time period, and the second vacuum value of the pressure gauge is obtained after a second time period, the difference between the second vacuum value and the first vacuum value is determined, and the difference between the two is compared with the negative pressure detection threshold to determine whether the negative pressure sealing of the sensor is qualified; the positive pressure sealing detection is specifically: the test bench is filled with oil and pressurized by an oil pressure pump, and the exhaust valve is closed after there are no bubbles in the oil discharged from the exhaust pipe, until the pressure gauge set on the test bench displays a pressure reaching the preset positive pressure, the first pressure value of the pressure gauge is obtained after a first time period, and the second pressure value of the pressure gauge is obtained after a second time period, the difference between the second pressure value and the first pressure value is determined, and the difference between the two is compared with the positive pressure detection threshold to determine whether the negative pressure sealing of the sensor is qualified.

[0016] The built-in sensor sealing detection device and method provided by the present invention provide a built-in closed detection environment for the sensor to be tested through a test bench; vacuumize the test bench by a vacuum pump so that the test bench is in a negative pressure state, and then the sensor to be tested is in a negative pressure environment, so that the negative pressure sealing of the built-in sensor is detected according to the change of the pressure value of the pressure gauge recorded within a specified time, and whether the negative pressure sealing of the sensor to be tested is qualified; oil pump is used to pressurize the test bench so that the test bench is in a positive pressure state, and then the sensor to be tested is in a positive pressure environment, so that the positive pressure sealing of the built-in sensor is detected according to the change of the pressure value of the pressure gauge recorded within a specified time, and whether the positive pressure sealing of the sensor to be tested is qualified. The device can test the sealing of GIS built-in ultra-high frequency sensors and transformer built-in ultra-high frequency sensors, and is widely used. At the same time, the device also comprehensively applies automatic control technology and pressure testing principles, and can vacuumize the tested sensor to perform vacuum test, i.e., negative pressure test, and can pressurize the tested sensor to perform oil pressure test, i.e., positive pressure test, and is simple to operate and convenient to detect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0018] Figure 1A schematic diagram of the structure of a built-in sensor sealing detection device provided in an embodiment of the present invention;

[0019] Figure 2 A front view of a built-in sensor sealing detection device provided by an embodiment of the present invention;

[0020] Figure 3 A top view of a built-in sensor sealing detection device provided by an embodiment of the present invention;

[0021] Figure 4 A side view of a built-in sensor sealing detection device provided by an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of the structure of the sensor installation at the adapter flange provided by an embodiment of the present invention;

[0023] Figure 6 A hydraulic principle diagram of a built-in sensor sealing detection device provided by an embodiment of the present invention;

[0024] Figure 7 This is an electrical schematic diagram of the built-in sensor sealing detection device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] Device Example:

[0027] See also Figures 1 to 7 , which shows the preferred structure of the built-in sensor sealing detection device provided by the embodiment of the present invention. As shown in the figure, the device includes: a base 1, a test bench 2, a vacuum pump 3, an oil pump 4, a pressure gauge 5 and a control panel 6; wherein,

[0028] The base 1 serves as a supporting platform, such as Figure 1 As shown, the bottom of the base 1 may be provided with walking wheels 11 to achieve position adjustment of the device.

[0029] The test bench 2 is arranged on the base 1, and is used to provide a built-in closed detection environment for the sensor to be tested. Specifically, a cavity may be provided inside the test bench 2, and is used to provide a detection cavity for the sensor to be tested; Figure 5As shown, a mounting hole 21 is provided on the outer wall of the test bench 2, and a transfer flange 22 is provided at the mounting hole 21 for connecting the sealing flange 7 and the sensor flange 8, so that the sensor to be tested can be installed inside the test bench 2. Of course, the sealing flange 7 can also be connected to the transfer flange 22, so that the sensor flange 8 can be directly installed later; the sensor to be tested can be reliably fixed on the transfer flange 22 on the test bench 2 by a nut to achieve a reliable connection. Among them, the test bench 2 can be made of stainless steel, which is corrosion-resistant, beautiful, and can prevent the impact of external forces. The sensor to be tested can be a built-in ultra-high frequency sensor, or other built-in sensors.

[0030] The vacuum pump 3 is connected to the test bench 2 and is used to evacuate the test bench 2 so that the test bench 2 is in a negative pressure state, thereby placing the sensor to be tested in a negative pressure environment. Specifically, the vacuum pump 3 can be connected to the test bench 2 through an oil pressure pipeline, and as a pressure source for vacuum testing, the sensor to be tested is placed in a negative pressure environment by evacuating the oil pressure pipeline; preferably, a vacuum valve 31 is provided on the oil pressure pipeline to control the opening and closing of the oil pressure pipeline, and the vacuum pump 3 is connected to the vacuum valve 31, the test bench 2, and the pressure gauge 5 through a pipeline, and the vacuum pump 3 can be evacuated to provide a vacuum test environment for the sealing test of the built-in ultra-high frequency sensor. Among them, the vacuum valve 31 can adopt a mixed stop valve, which can simultaneously ensure the sealing of the transformer oil liquid and the sealing of the gas.

[0031] The oil pump 4 is connected to the test bench 2 and is used to inject oil and pressurize so that the test bench 2 is in a positive pressure state, thereby placing the sensor to be tested in a positive pressure environment. Specifically, the oil pump 4 can be connected to the test bench through a vacuum pipeline; preferably, a vacuum valve is provided on the vacuum pipeline to control the opening and closing of the vacuum pipeline. In the oil pressure test of the ultra-high frequency built-in sensor sealing test, the oil pump 4 is connected to the oil pressure valve 41, the test bench 2, and the pressure meter 5 through a pipeline, and its function is to serve as a pressure source for the oil pressure test, and to place the sensor to be tested in a positive pressure environment by injecting oil and pressurizing. The oil pressure valve 41 is connected to the test bench 3, and its function is to control the opening and closing of the oil pressure pipeline. In this embodiment, the detection pipeline is divided into two layers, the upper layer is the vacuum test part, and the lower layer is the oil pressure test part, so as to adjust the vacuum and oil pressure respectively. Among them, the oil pump 4 can be connected with an overflow valve to adjust the pressure value of the oil system so that it is compatible with the positive pressure detection pressure value of the sensor to be tested, thereby injecting oil and pressurizing the test bench 2.

[0032] The pressure gauge 5 is connected to the test bench 2 and is used to detect and display the pressure value in the test bench 2 in real time, so as to obtain the pressure value of the sensor to be tested, and then perform positive pressure and negative pressure sealing tests on the sensor to be tested according to the change of the pressure value. Specifically, the pressure gauge 5 can be connected to the test bench 2 through management to detect the pressure under the vacuum test environment and the oil pressure test environment, and can detect the pressure value in real time, that is, display the pressure value of the sensor to be tested in real time, and then realize the sealing test of the sensor to be tested.

[0033] The control panel 6 is connected to the vacuum pump 3 and the oil pump 4 respectively, and is used to control the start and stop of the vacuum pump 3 and the oil pump 4. Specifically, the start and stop signals and the pressure setting values ​​can be obtained through the control panel 6, and the start and stop of the vacuum pump 3 and the oil pump 4 can be controlled according to the obtained signals. Of course, the control panel 6 can also be connected to the pressure gauge 5, so that when the pressure value detected by the pressure gauge 5 reaches the set value, the vacuum pump 3 and the oil pump 4 can be controlled to stop. In particular, when the pressure value detected by the pressure gauge 5 reaches the set preset negative pressure, the vacuum pump 3 can be controlled to stop vacuuming, and when the pressure value detected by the pressure gauge 5 reaches the set preset positive pressure, the oil pump 4 can be controlled to stop oil injection and pressurization; of course, the control panel 6 can also be connected to the oil pressure valve 41, the exhaust valve 31 and other valve groups to realize the control of each valve group. Among them, the control panel 6 can be provided with a pressurization button, a vacuum button, and an acquisition input structure of a preset negative pressure and a preset positive pressure.

[0034] In this embodiment, in order to improve the accuracy of the detection, preferably, there can be multiple test benches 2, and each test bench 2 is independent of each other, so as to independently perform positive pressure or negative pressure sealing tests on multiple sensors to be tested. Each independent test bench has both vacuum test function and oil pressure test function, and can independently complete the sealing test of 6 sensors at the same time, which can effectively improve the detection efficiency. The device can realize detection at the same time, for example, part of it can perform positive pressure sealing test, part of it can perform negative pressure sealing test, and it can also perform positive pressure or negative pressure sealing test at the same time, which can not only ensure the accuracy of the test, but also perform the test under the same external environment, and at the same time improve the efficiency of the test. In this embodiment, six test benches 2 are used as an example for explanation, of course, it can also be other numbers, and there is no limitation on it in this embodiment.

[0035] In this embodiment, the test bench 2 may also be provided with an exhaust pipe and an oil drain pipe, the exhaust pipe is provided with an exhaust valve, and the oil drain pipe is provided with an oil drain valve. Figure 7 As shown, DT1 is the electromagnet of the oil filling process of the device. When J1 is closed, the oil pump starts, DT1 is energized, and the device starts to fill oil; DT2 is the electromagnet of the oil draining process. When J2 is closed, DT2 is energized, the device stops filling oil and starts to drain oil. Among them, J1 and J2 can be switches of corresponding routes respectively.

[0036] In this embodiment, if Figure 6 As shown, when performing a negative pressure test, the sensor to be tested is reliably fixed on the test bench 2 with a nut, the oil pressure valve 41 and the exhaust valve are closed, the vacuum valve 31 is opened, and then the vacuum pump 3 is started through the control panel 6 to evacuate the vacuum. After the pressure reaches the required value, such as the preset positive pressure, the vacuum pump 3 automatically stops, and the vacuum valves 31 are closed in turn, and the data displayed by the corresponding pressure gauge 5 in each time period are recorded. Finally, according to the change of the pressure value within the specified time, it is judged whether the tested sensor is qualified; when performing a positive pressure test, the sensor to be tested is reliably fixed on the test bench 2 with a nut, the vacuum valve 31 and the oil drain valve are closed, the oil pressure valve 41 and the exhaust valve are opened, and then the oil pump 4 is started through the control panel 6, the overflow valve is adjusted to make the oil system reach the required pressure value, and the pressurization button on the control panel 6 is pressed to start oil filling and pressurization. After there are no bubbles in the oil discharged from the exhaust pipe, the corresponding exhaust valve is closed. After the pressure reaches the required value, the oil pump 4 automatically stops, and the oil pressure valves 41 are closed in turn. The data displayed by the corresponding pressure gauge 5 in each time period are recorded. Finally, according to the change of the pressure value within the specified time, it is judged whether the tested workpiece is qualified. After the test, open the oil drain valve to quickly drain the oil and pressure to ensure the personal safety of the test personnel.

[0037] In summary, the built-in sensor sealing detection device provided in this embodiment provides a built-in closed detection environment for the sensor to be tested through the test bench 2; vacuum is drawn by a vacuum pump to make the test bench 2 in a negative pressure state, and then the sensor to be tested is in a negative pressure environment, so as to detect the negative pressure sealing of the built-in sensor according to the change of the pressure value of the pressure gauge 5 recorded within a specified time, and judge whether the negative pressure sealing of the tested sensor is qualified; oil is injected and pressurized by the oil pump 4 to make the test bench 2 in a positive pressure state, and then the sensor to be tested is in a positive pressure environment, so as to detect the positive pressure sealing of the built-in sensor according to the change of the pressure value of the pressure gauge 5 recorded within a specified time, and judge whether the positive pressure sealing of the tested sensor is qualified. The device can not only test the sealing of the built-in ultra-high frequency sensor of GIS, but also test the sealing of the built-in ultra-high frequency sensor of transformer, and has a wide range of applications. At the same time, the device also comprehensively applies automatic control technology and pressure testing principles, and can not only vacuum the sealing of the tested sensor to perform vacuum test, i.e., negative pressure test, but also inject oil and pressurize the sealing of the tested sensor to perform oil pressure test, i.e., positive pressure test, and is simple to operate and convenient to detect.

[0038] Method Example:

[0039] The present invention also proposes a built-in sensor sealing detection method, which uses the above-mentioned built-in sensor sealing detection device to perform positive pressure sealing detection and negative pressure sealing detection; wherein,

[0040] The negative pressure sealing test is specifically as follows: the sensor to be tested is installed on the test bench in a built-in manner, and the test bench is evacuated with a vacuum pump until the pressure gauge set on the test bench shows that the pressure is lower than the preset negative pressure, and a first vacuum value of the pressure gauge is obtained after a first time period, and a second vacuum value of the pressure gauge is obtained after a second time period, and the difference between the second vacuum value and the first vacuum value is determined, and the difference between the two is compared with the negative pressure detection threshold to determine whether the negative pressure sealing of the sensor is qualified.

[0041] Specifically, first, Figure 5 As shown, the sensor to be tested, such as a built-in UHF sensor, is installed on the adapter flange 22 of the test bench 2, the oil pressure valve 41 and the exhaust valve are closed, and the vacuum valve 31 is opened. Then, the vacuum pump 4 is started through the control panel 6, and the test bench is evacuated by the vacuum pump 3 until the pressure is lower than the preset negative pressure, and the vacuum pump 4 and the valves connected to the vacuum pump 4 are closed. Of course, the vacuum pump 4 and the vacuum valves 41 can also be controlled to stop automatically through the control panel 6, so that the sensor to be tested is in a negative pressure environment, and the pressure of the negative pressure environment is lower than the preset negative pressure. Finally, after stopping the vacuuming, obtain the first vacuum value P1 of the pressure gauge after the first time period, and obtain the second vacuum value P2 of the pressure gauge after the second time period, determine the difference between the second vacuum value P2 and the first vacuum value P1, and compare the difference between the two with the negative pressure detection threshold to determine whether the negative pressure sealing of the sensor is qualified; for example, the vacuum value P1 can be read after 1 hour, and the second vacuum value P2 can be read after 1.5 hours. The difference between P2 and P1 is compared with 0.2kPa. If it is less than 0.2kPa, the negative pressure sealing of the sensor is judged to be qualified, otherwise it is judged to be unqualified. After obtaining the second vacuum value, that is, after the test is completed, open the exhaust valve to quickly intake air. That is to say, in this embodiment, the first time period can be 1 hour, the second time period can be 0.5 hours, the preset negative pressure can be 0.3kPa, and the negative pressure detection threshold is 0.2kPa. Of course, other values ​​can also be used, and there is no limitation on it in this embodiment.

[0042] The positive pressure sealing test is specifically as follows: an oil pressure pump is used to fill the test bench with oil and pressurize it. After there are no bubbles in the oil discharged from the exhaust pipe, the exhaust valve is closed until the pressure gauge set on the test bench shows that the pressure reaches the preset positive pressure. After a first time period, a first pressure value of the pressure gauge is obtained, and after a second time period, a second pressure value of the pressure gauge is obtained. The difference between the second pressure value and the first pressure value is determined, and the difference between the two is compared with the positive pressure detection threshold to determine whether the negative pressure sealing of the sensor is qualified.

[0043] Specifically, first, Figure 5As shown, the sensor to be tested, such as a built-in ultra-high frequency sensor, is installed on the adapter flange 22 of the test bench 2, the vacuum valve 31 and the oil drain valve are closed, the oil pressure valve 41 and the exhaust valve are opened, and then the oil pump 4 is started through the control panel 6, the overflow valve is adjusted to make the oil system reach the required pressure value, and the pressurization button on the control panel 6 is pressed to start oil injection and pressurization. After the oil discharged from the exhaust pipe has no bubbles, the corresponding exhaust valve is closed. After the pressure reaches the required value, that is, the preset positive pressure, the oil pump 4 is stopped or the oil pump 4 stops automatically, and each oil pressure valve 41 is closed in turn, and the data displayed by the corresponding pressure gauge 5 in each time period is recorded. Finally, according to the change of the pressure value within the specified time, it is judged whether the tested workpiece is qualified; for example, the first pressure value of the pressure gauge can be obtained after the first time period, and the second pressure value of the pressure gauge can be obtained after the second time period, and the difference between the second pressure value and the first pressure value can be determined, and the difference between the two can be compared with the positive pressure detection threshold to judge whether the negative pressure sealing of the sensor is qualified. After the test is completed, the oil drain valve is opened to quickly drain the oil and pressure to ensure the personal safety of the test personnel.

[0044] Since the built-in sensor sealing detection device has the above-mentioned effects, the method for performing sealing detection using the above-mentioned built-in sensor sealing detection device also has corresponding technical effects.

[0045] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0046] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A built-in sensor sealing detection device, characterized in that: include: A base, wherein the bottom of the base is provided with running wheels; A test bench, arranged on the base, for providing a built-in closed testing environment for the sensor to be tested; A vacuum pump, which is connected to the test bench and is used to evacuate the test bench to place it in a negative pressure state, thereby placing the sensor to be tested in a negative pressure environment; An oil pump, which is connected to the test bench and is used for injecting oil and pressurizing the oil so that the test bench is in a positive pressure state, thereby placing the sensor to be tested in a positive pressure environment; A pressure gauge is connected to the test bench and is used to detect and display the pressure value in the test bench in real time to obtain the pressure value of the sensor to be tested, and then perform positive and negative pressure sealing tests on the sensor to be tested according to the changes in the pressure value.

2. The built-in sensor sealing detection device according to claim 1, characterized in that: The vacuum pump and the test bench are connected via a vacuum pipeline, and a vacuum valve is provided on the vacuum pipeline to control the opening and closing of the vacuum pipeline.

3. The built-in sensor sealing detection device according to claim 1, characterized in that: The oil pump and the test bench are connected through an oil pressure pipeline, and a vacuum valve is provided on the oil pressure pipeline to control the opening and closing of the oil pressure pipeline.

4. The built-in sensor sealing detection device according to claim 1 or 2, characterized in that: The test bench is provided with a mounting hole, and a transfer flange is provided at the mounting hole for connecting the sealing flange and the sensor flange so that the sensor to be tested can be installed inside the test bench.

5. The built-in sensor sealing detection device according to claim 1 or 2, characterized in that: There are multiple test benches, and each of the test benches is independent of each other, so as to independently perform positive pressure or negative pressure sealing tests on multiple sensors to be tested.

6. The built-in sensor sealing detection device according to claim 1 or 2, characterized in that: Also includes: A control panel is connected to the vacuum pump and the oil pump respectively, and is used to control the start and stop of the vacuum pump and the oil pump.

7. The built-in sensor sealing detection device according to claim 1 or 2, characterized in that: The test bench is connected with an oil drain valve and an exhaust valve.

8. The built-in sensor sealing detection device according to claim 1 or 2, characterized in that: The vacuum valve is a mixed shut-off valve.

9. The built-in sensor sealing detection device according to claim 1 or 2, characterized in that: The test bench is made of stainless steel.

10. A method for detecting the sealing performance of a built-in sensor, characterized in that: The built-in sensor sealing detection device according to any one of claims 1 to 9 is used to perform positive pressure sealing detection and negative pressure sealing detection; wherein, The negative pressure sealing test is specifically as follows: the sensor to be tested is installed on the test bench in a built-in manner, and the test bench is evacuated by a vacuum pump until the pressure gauge set on the test bench shows that the pressure is lower than the preset negative pressure, a first vacuum value of the pressure gauge is obtained after a first time period, and a second vacuum value of the pressure gauge is obtained after a second time period, the difference between the second vacuum value and the first vacuum value is determined, and the difference between the two is compared with the negative pressure detection threshold value to determine whether the negative pressure sealing of the sensor is qualified; The positive pressure sealing test is specifically as follows: an oil pressure pump is used to fill oil and pressurize the test bench, and after there are no bubbles in the oil discharged from the exhaust pipe, the exhaust valve is closed until the pressure gauge set on the test bench shows that the pressure reaches a preset positive pressure, a first pressure value of the pressure gauge is obtained after a first time period, and a second pressure value of the pressure gauge is obtained after a second time period, the difference between the second pressure value and the first pressure value is determined, and the difference between the two is compared with the positive pressure detection threshold to determine whether the negative pressure sealing of the sensor is qualified.

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