Electric automobile cable anti-siphon detection method and testing device thereof

Abstract

The invention relates to an electric automobile cable anti-siphon detection method and a testing device thereof, and relates to the technical field of electric automobile cable testing devices, and the testing device comprises a vacuum pump, a gas storage tank and a testing box; the test box comprises an upper cover, a shell and a lower cover which are detachably connected; a plurality of negative pressure holes are formed in the inner side of the upper cover in an annular array manner; a coil pipe is detachably installed in the shell, the insertion sealing pipes correspond to the negative pressure holes one to one, and when the upper cover and the shell are assembled, the lower rubber sleeve is inserted into the upper rubber sleeve; a stirring mechanism is arranged in the lower cover; according to the invention, the use of connecting pipelines is reduced, sealing and locking are carried out through the cooperation of a movable locking buckle and a fixed locking buckle, the negative pressure environment of the device can be effectively ensured, and in addition, the climbing height of a test solution can be more clearly observed through the addition of an oil-soluble fluorescent yellow dye, so that the detection accuracy is improved. And the accuracy of the test structure is ensured.

Description

Technical Field

[0001] This invention relates to the technical field of electric vehicle cable testing devices, specifically to an electric vehicle cable anti-siphon detection method and testing device. Background Technology

[0002] The current market demand for hybrid new energy vehicles is booming. For hybrid vehicles equipped with transmissions, the transmission is filled with Automatic Transmission Fluid (ATF). The cables must possess excellent anti-siphon properties to prevent the ATF from rising due to capillary action between conductors, which could lead to insulation failure, short circuits, and other serious malfunctions. Therefore, anti-siphon performance is a critical performance indicator for automotive cables, especially those used in transmissions. Accurate and reliable testing of this performance is a key step in ensuring product quality.

[0003] A siphon test device, disclosed in the prior art with publication number "CN215640144U", includes a housing with a vacuum mechanism inside. The vacuum mechanism's inlet is connected to an air filter, and its outlet is connected to a distributor. A negative pressure gauge is installed between the vacuum mechanism's outlet and the distributor. The distributor has several connection ports. A test tube group corresponding to the distributor is located on one side of the housing. The test tube group includes a test tube positioning rack with several test tube slots for holding the test tubes. One end of the cable under test is connected to the connection port, and the other end of the cable is immersed in the test liquid in the test tube. This device provides a convenient and stable siphon test device suitable for testing anti-siphon cables.

[0004] However, the above-mentioned device still has some obvious defects in use: 1. After the test is completed, the device relies entirely on the naked eye to observe the rise height of the clear automatic transmission fluid on the metal conductor surface under natural light. However, the boundary of the fluid is blurred, making it difficult to accurately identify and measure, which leads to problems such as strong subjectivity and large error in the interpretation of the results; 2. The above-mentioned device and similar testing devices in the prior art use multiple connectors, and it is difficult to ensure the sealing effect of each connector, which may lead to the situation where the negative pressure environment is difficult to maintain, affecting the accuracy of the test. Summary of the Invention

[0005] Therefore, it is necessary to provide a method and testing device for detecting anti-siphoning of electric vehicle cables, addressing the shortcomings of existing technologies.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An anti-siphon testing device for electric vehicle cables includes a vacuum pump, an air tank, and a test box, wherein the vacuum pump is connected to the air tank and the air tank is connected to the test box via air pipes. The test box includes a detachably connected upper cover, a housing, and a lower cover: The inner side of the upper cover is provided with a ring array of multiple negative pressure holes. Each negative pressure hole is connected to the gas storage tank through a first connector provided on the upper part of the upper cover. Each negative pressure hole is equipped with an upper rubber sleeve. One side of the upper rubber sleeve is provided with a fixed locking buckle, and the other side is provided with a retractable movable locking buckle. The housing is detachably installed with a coil, which includes a disassembly plate and a plurality of plug-in sealing tubes fixedly installed on it. Each plug-in sealing tube corresponds to a negative pressure hole, and the upper end of the plug-in sealing tube is connected to a lower rubber sleeve. When the upper cover is assembled with the housing, the lower rubber sleeve is inserted into the upper rubber sleeve, and during the movement of the movable locking buckle toward the fixed locking buckle, the plug-in part of the upper rubber sleeve and the lower rubber sleeve is sealed and locked. The lower cover is equipped with a stirring mechanism for mixing transmission fluid and fluorescent agent to form a test solution. Test cables are movably inserted into each of the plug-in sealing tubes. The lower end of the test cable extends into the lower cover and is immersed in the test liquid, while the upper end passes through the lower rubber sleeve and is located in the upper rubber sleeve. By pumping air from the first connector end, a negative pressure is formed to achieve the anti-siphon test of electric vehicle cables.

[0007] Preferably, the upper cover and the housing, and the lower cover and the housing are connected by magnetic attraction or snap-fit, and a sealing ring is provided on the contact end face, so that the airtightness of the test box is achieved by the mutual contact of the sealing rings.

[0008] Preferably, the upper cover is further divided into an upper negative pressure space and a lower negative pressure space by a partition, and the negative pressure hole is provided on the partition.

[0009] Preferably, the fixed locking buckle is fixedly installed on the connecting seat, and the connecting seat is fixedly installed below the partition.

[0010] Preferably, the outer edge of the upper cover has multiple telescopic holes arranged in a ring array on one side of the lower negative pressure space. Each telescopic hole corresponds to a negative pressure hole. A negative pressure piston cylinder is also fixedly installed on the outer side of the upper cover outside the telescopic holes. A telescopic piston is slidably arranged inside the negative pressure piston cylinder. The telescopic piston is fixedly connected to a movable locking buckle through a connecting rod. A second connector is also provided on the outer edge of the upper cover on the side of the lower negative pressure space. During the process of connecting the second connector to the gas storage tank through an air pipe, the negative pressure generated in the lower negative pressure space pushes the telescopic piston and the movable locking buckle to move closer to the fixed locking buckle, thereby achieving the sealing and locking of the upper and lower rubber sleeves.

[0011] Preferably, a traction spring is connected to the end of the negative pressure piston cylinder away from the telescopic hole, and the other end of the traction spring is connected to the telescopic piston. The traction spring pulls the telescopic piston away from the telescopic hole without external force, thereby releasing the sealing lock of the upper and lower rubber sleeves.

[0012] Preferably, the stirring mechanism includes a magnetic bead, a magnetic drive block, and a rotating impeller. The magnetic bead is placed inside the lower cover, and the magnetic drive block is located outside the lower cover and is magnetically connected to the magnetic bead in a non-contact manner. The magnetic drive block and the rotating impeller are coaxially fixed. The rotational motion of the rotating impeller drives the magnetic bead to move synchronously, thereby uniformly stirring the transmission oil and fluorescent agent.

[0013] Preferably, the lower cover is also detachably connected to the base. The base has a fixed-axis rotating chamber for accommodating the magnetic drive block and the rotating impeller. The base on both sides of the fixed-axis rotating chamber has an air inlet and an air outlet that are connected internally and externally. A third connector is also provided on the base on the side of the air outlet. The third connector is connected to the air storage tank through an air pipe, thereby driving the rotating impeller to rotate during the pumping process.

[0014] Preferably, the first connector, the second connector, and the third connector adopt a universal interface of the same specification. The gas storage tank is also equipped with a three-way connector, which is connected to two plug-in gas pipes through a solenoid valve. The plug-in gas pipes are movably engaged with the first connector, the second connector, and the third connector.

[0015] A method for detecting anti-siphoning in electric vehicle cables, using the aforementioned anti-siphoning testing device for electric vehicle cables, includes the following steps: Step 1: Cut multiple 140mm long wires and use wire strippers to remove 10mm of insulation from both ends of each wire to form a test cable. Step 2: Pour 100ml of automatic transmission fluid into the lower cover and add one drop of oil-soluble fluorescent yellow dye. Then connect the housing to the lower cover and connect it to the third connector through the plug-in air tube. Start the vacuum pump to exhaust gas. The gas drives the rotating impeller and magnetic ball to rotate, thereby stirring the mixed solution. Stop stirring after 1 minute to form the test solution. Step 3: Insert the test cable prepared in Step 1 through the plug-in sealing tube, immersing one end of it in the test liquid, and ensuring that the test liquid is submerged above the insulation layer of the test cable. Then, cover it with the top cover, so that the lower rubber sleeve is inserted into the upper rubber sleeve. Step 4: Connect the plug-in air tube to the second connector, start the vacuum pump to perform the exhaust operation, so that negative pressure is formed in the lower negative pressure space. The negative pressure generated in the lower negative pressure space pushes the telescopic piston and the movable locking buckle to move closer to the fixed locking buckle, thereby achieving the sealing and locking of the upper and lower rubber sleeves. Step 5: Connect another plug-in air tube to the first connector and apply a vacuum of 15 kPa to the upward negative pressure space. Maintain this vacuum for 60 ± 5 minutes. After the test is completed, remove the test cable and peel off the insulation layer of the oil-immersed end to fully expose the conductor of the test cable. In a dark room or dark environment, use an ultraviolet light source to irradiate the exposed conductor to determine the rise height of the test liquid. Determine whether the rise height is qualified according to the standard, and finally complete the anti-siphon test of electric vehicle cables.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention performs anti-siphon tests on multiple test cables simultaneously in the test box, thereby reducing the use of connecting pipes. At the same time, the combination of movable and fixed locking buckles ensures a sealed and locked environment, effectively guaranteeing the negative pressure environment of the device. In addition, the addition of oil-soluble fluorescent yellow dye allows for clearer observation of the rise height of the test liquid, thus ensuring the accuracy of the test structure. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the overall structure of the present invention after disassembly. Figure 3 This is a cross-sectional view of the internal structure of the test box of the present invention; Figure 4 This is a schematic diagram of the magnetic coupling between the magnetic bead and the magnetic drive block of the present invention; Figure 5 This is a schematic diagram of the overall structure of the upper cover of the present invention; Figure 6 This is a schematic cross-sectional view of the top cover structure of the present invention.

[0018] In the diagram: 1 Vacuum pump, 2 Gas storage tank, 3 Test box, 4 Top cover, 5 Housing, 6 Bottom cover, 7 Negative pressure hole, 8 First connector, 9 Upper rubber sleeve, 10 Fixed locking buckle, 11 Movable locking buckle, 12 Insert sealing tube, 13 Disassembly plate, 14 Lower rubber sleeve, 15 Test cable, 16 Partition, 17 Upper negative pressure space, 18 Lower negative pressure space, 19 Connecting seat, 20 Telescopic hole, 21 Negative pressure piston cylinder, 22 Telescopic piston, 23 Second connector, 24 Traction spring, 25 Magnetic ball, 26 Magnetic drive block, 27 Rotating impeller, 28 Base, 29 Fixed-axis rotating chamber, 30 Air inlet, 31 Air outlet, 32 Third connector, 33 T-connector, 34 Solenoid valve, 35 Insert-type air pipe. Detailed Implementation

[0019] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0020] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0021] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0025] Please see Figure 1-6 The present invention provides the following technical solution: Example 1: An anti-siphon test device for electric vehicle cables includes a vacuum pump 1, an air storage tank 2, and a test box 3. The vacuum pump 1 and the air storage tank 2, as well as the air storage tank 2 and the test box 3, are connected by air pipes. Test box 3 includes a detachably connected upper cover 4, housing 5, and lower cover 6: Multiple negative pressure holes 7 are arranged in a ring array on the inner side of the top cover 4. Each negative pressure hole 7 is connected to the gas storage tank 2 through the first connector 8 set above the top cover 4. Each negative pressure hole 7 is equipped with an upper rubber sleeve 9. Each upper rubber sleeve 9 is equipped with a fixed locking buckle 10 on one side and a retractable movable locking buckle 11 on the other side. The housing 5 is detachably installed with a coil, which includes a disassembly plate 13 and a plurality of plug-in sealing tubes 12 fixedly installed on it. The plug-in sealing tubes 12 correspond one-to-one with the negative pressure holes 7, and the upper end of the plug-in sealing tubes 12 is connected to a lower rubber sleeve 14. When the upper cover 4 is assembled with the housing 5, the lower rubber sleeve 14 is inserted into the upper rubber sleeve 9, and the upper rubber sleeve 9 and the lower rubber sleeve 14 are sealed and locked at the insertion part by moving towards the fixed locking buckle 10 through the movable locking buckle 11. The lower cover 6 is equipped with a stirring mechanism for mixing transmission fluid and fluorescent agent to form a test solution; Test cables 15 are movably inserted into the sealing tube 12. The lower end of the test cable 15 extends into the lower cover 6 and is immersed in the test liquid, while the upper end passes through the lower rubber sleeve 14 and is located in the upper rubber sleeve 9. By pumping air from the first connector 8 end, a negative pressure is formed to achieve the anti-siphon test of electric vehicle cables.

[0026] In this embodiment, the vacuum pump 1, the gas storage tank 2, and the test box 3 are connected by a gas pipe. The vacuum pump 1 provides a vacuum environment, and the gas storage tank 2 buffers and stabilizes the system pressure to avoid pressure fluctuations. A high-precision negative pressure gauge is also installed on the gas storage tank 2 to monitor and display the vacuum value of the system in real time. In this embodiment, transmission fluid is used as the siphon solution, and a fluorescent solvent is added to it. The fluorescent solvent is an oil-soluble fluorescent yellow dye. Since the fluorescent solvent and transmission fluid need to be fully mixed, a stirring mechanism is provided in the lower cover 6 to mix the transmission fluid and the fluorescent agent to form a test solution. At the same time, the lower cover 6 serves as a receiving tray for the mixture, so there is no need to transfer the mixture. A coil is also detachably installed inside the housing 5. The coil is fixedly connected to the housing 5 by a threaded connection. Since different diameter test cables 15 need to be tested during the test, different specifications of plug-in sealing tubes 12 need to be adapted. Therefore, a detachable coil is required. A lower rubber sleeve 14 is provided above the insertion sealing tube 12. The lower rubber sleeve 14 is inserted into the upper rubber sleeve 9 provided at the bottom of the upper cover 4. Since a gap will be formed between the two after insertion, a fixed locking buckle 10 is provided on one side of the upper rubber sleeve 9, and a retractable movable locking buckle 11 is provided on the other side. The movable locking buckle 11 abuts against the fixed locking buckle 10, thereby sealing and locking the insertion part of the upper rubber sleeve 9 and the lower rubber sleeve 14. The extension and retraction process of the movable locking buckle 11 is also driven by negative pressure. Therefore, its locking process can also be achieved by the negative pressure environment generated by the vacuum pump 1, which greatly improves the integration of the device. In addition, compared with the prior art, the test cables 15 in this embodiment are arranged in a ring array in the test box 3 and share the same negative pressure vacuum environment, thereby ensuring that the test results will not be deviated due to the difference in the sealing effect in each test tube. This simplifies the structure and further improves the accuracy of the test results.

[0027] Example 2: The upper cover 4 is connected to the housing 5 and the lower cover 6 is connected to the housing 5 by magnetic attraction or snap-fit. A sealing ring is provided on the contact end face. The airtightness of the test box is achieved by the mutual contact of the sealing rings.

[0028] The upper cover 4 is further divided into an upper negative pressure space 17 and a lower negative pressure space 18 by a partition 16, and negative pressure holes 7 are provided on the partition 16.

[0029] The fixed locking buckle 10 is fixedly installed on the connecting seat 19, and the connecting seat 19 is fixedly installed below the partition 16.

[0030] In this embodiment, the connection method of the upper cover 4, the shell 5 and the lower cover 6 is further disclosed, wherein the magnetic connection method is preferred. With the negative pressure environment inside the test box 3, the internal airtightness can be effectively guaranteed. At the same time, the upper cover 4 is further divided into an upper negative pressure space 17 and a lower negative pressure space 18 by a partition 16. The negative pressure environments between the two are isolated and do not interfere with each other, thereby facilitating the normal performance of siphon testing and sealing.

[0031] Example 3: The outer edge of the upper cover 4 is provided with a ring array of multiple telescopic holes 20 on one side of the lower negative pressure space 18. The telescopic holes 20 correspond one-to-one with the negative pressure holes 7. A negative pressure piston cylinder 21 is also fixedly installed on the outer side of the upper cover 4 outside the telescopic holes 20. A telescopic piston 22 is slidably arranged in the negative pressure piston cylinder 21. The telescopic piston 22 is fixedly connected to the movable locking buckle 11 through a connecting rod. A second connector 23 is also provided on the outer edge of the upper cover 4 on one side of the lower negative pressure space 18. During the process of the second connector 23 communicating with the gas tank 2 through the air pipe, the negative pressure generated in the lower negative pressure space 18 pushes the telescopic piston 22 and the movable locking buckle 11 to move closer to the fixed locking buckle 10, thereby achieving the sealing and locking of the upper rubber sleeve 9 and the lower rubber sleeve 14.

[0032] The negative pressure piston cylinder 21 is connected to a traction spring 24 at one end away from the telescopic hole 20. The other end of the traction spring 24 is connected to the telescopic piston 22. Without external force, the traction spring 24 pulls the telescopic piston 22 to move away from the telescopic hole 20, thereby releasing the sealing lock of the upper rubber sleeve 9 and the lower rubber sleeve 14.

[0033] In this embodiment, the specific structure for actuating the telescopic movement of the movable locking buckle 11 is further disclosed, as shown in the appendix to the specification. Figure 5 and 6 When a negative pressure environment is formed in the negative pressure space 18, the external air pressure will enter the negative pressure piston cylinder 21 through the hole at the tail end of the negative pressure piston cylinder 21, thereby pushing the telescopic piston 22 and the movable locking buckle 11 to move closer to the fixed locking buckle 10, thus achieving the sealing and locking of the upper rubber sleeve 9 and the lower rubber sleeve 14. When the negative pressure environment in the negative pressure space 18 disappears, the telescopic piston 22 and the movable locking buckle 11 move away from the fixed locking buckle 10 under the traction of the traction spring 24, thereby causing the upper rubber sleeve 9 and the lower rubber sleeve 14 to disengage from the sealing and locking state. In actual operation, it is necessary to first seal and lock the upper rubber sleeve 9 and the lower rubber sleeve 14, and then create a negative pressure environment in the upper negative pressure space 17 through the first connector 8, so as to ensure the normal progress of the test process.

[0034] Example 4: The stirring mechanism includes a magnetic bead 25, a magnetic drive block 26, and a rotating impeller 27. The magnetic bead 25 is placed inside the lower cover 6, and the magnetic drive block 26 is located outside the lower cover 6 and is magnetically connected to the magnetic bead 25 in a non-contact manner. The magnetic drive block 26 and the rotating impeller 27 are fixed coaxially. The rotation of the rotating impeller 27 drives the magnetic bead 25 to move synchronously, thereby uniformly stirring the transmission oil and fluorescent agent.

[0035] The lower cover 6 is also detachably connected to the base 28. The base 28 has a fixed-axis rotating chamber 29 for accommodating the magnetic drive block 26 and the rotating impeller 27. The base 28 on both sides of the fixed-axis rotating chamber 29 has an air inlet 30 and an air outlet 31 that are connected internally and externally. The base 28 on the side of the air outlet 31 is also provided with a third connector 32. The third connector 32 is connected to the air storage tank 2 through an air pipe, thereby driving the rotating impeller 27 to rotate during the pumping process.

[0036] In this embodiment, a drive mechanism for rotating the magnetic ball 25 is further disclosed. The rotation of the rotating impeller 27 ultimately drives the magnetic ball 25 to rotate and stir. At the same time, air inlet 30 and air outlet 31 are provided on the base 28 at both ends of the fixed-axis rotating chamber 29. A third connector 32 is also provided on the base 28 on the side of the air outlet 31. The third connector 32 is connected to the gas storage tank 2 through a gas pipe. Thus, during the gas extraction process of the vacuum pump 1, the gas drives the rotating impeller 27 to rotate on the fixed axis. This operation further utilizes the gas generated by the vacuum pump 1 as the driving force, further improving the integration of the device. It should be noted that the stirring process of the magnetic ball 25 occurs in the preparation stage of the test. Therefore, the third connector 32 is the first component to be connected to the gas storage tank 2.

[0037] Example 5: The first connector 8, the second connector 23, and the third connector 32 use a universal interface of the same specification. The gas tank 2 is also equipped with a three-way connector 33. The three-way connector 33 is connected to two plug-in air pipes 35 through a solenoid valve 34. The plug-in air pipes 35 are in movable cooperation with the first connector 8, the second connector 23, and the third connector 32.

[0038] To ensure universality of insertion and removal, the first connector 8, the second connector 23, and the third connector 32 adopt a universal interface of the same specification. Since at least two air tubes are required during the test, a three-way connector 33 is also installed on the air tank 2. The three-way connector 33 is connected to two plug-in air tubes 35 through a solenoid valve 34. The opening and closing of the plug-in air tubes 35 are controlled by the solenoid valve 34, so that one or both of the two plug-in air tubes 35 can conduct air to the air tank 2 individually or simultaneously, thereby enabling the test process to proceed smoothly.

[0039] A method for detecting anti-siphoning in electric vehicle cables, using the aforementioned anti-siphoning testing device for electric vehicle cables, includes the following steps: Step 1: Cut multiple 140mm long wires and use wire strippers to remove 10mm of insulation from both ends of each wire to form test cable 15. Step 2: Pour 100ml of automatic transmission fluid into the lower cover 6 and add one drop of oil-soluble fluorescent yellow dye. Then connect the housing 5 to the lower cover 6 and connect it to the third connector 32 through the plug-in air tube 35. Start the vacuum pump 1 to perform the exhaust operation. The gas drives the rotating impeller 27 and the magnetic ball 25 to rotate, thereby stirring the mixed solution. Stop stirring after 1 minute to form the test solution. Step 3: Insert the test cable 15 prepared in Step 1 through the plug-in sealing tube 12, so that one end of it is inserted into the test liquid, and ensure that the test liquid is immersed above the insulation layer of the test cable 15. Then cover it with the upper cover 4, so that the lower rubber sleeve 14 is inserted into the upper rubber sleeve 9. Step 4: Connect the plug-in air tube 35 to the second connector 23, start the vacuum pump 1 to perform the exhaust operation, so that a negative pressure is formed in the lower negative pressure space 18. The negative pressure generated in the lower negative pressure space 18 pushes the telescopic piston 22 and the movable locking buckle 11 to move closer to the fixed locking buckle 10, thereby achieving the sealing and locking of the upper rubber sleeve 9 and the lower rubber sleeve 14. Step 5: Connect another plug-in air tube 35 to the first connector 8, and apply a vacuum of 15 kPa to the upward negative pressure space 17. Maintain this vacuum for 60 ± 5 minutes. After the test is completed, remove the test cable 15 and peel off the insulation layer of the part that has been soaked in oil to fully expose the conductor part of the test cable 15. In a dark room or dark environment, use an ultraviolet light source to irradiate the exposed conductor part to determine the rise height of the test liquid. Determine whether the height is qualified according to the standard, and finally complete the anti-siphon test of electric vehicle cables.

[0040] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An anti-siphon testing device for electric vehicle cables, comprising a vacuum pump (1), an air tank (2), and a test box (3), wherein the vacuum pump (1) and the air tank (2), and the air tank (2) and the test box (3) are connected by air pipes, characterized in that: The test box (3) includes a detachably connected upper cover (4), a housing (5), and a lower cover (6): The inner side of the upper cover (4) is provided with a ring array of multiple negative pressure holes (7). Each negative pressure hole (7) is connected to the gas storage tank (2) through the first connector (8) provided above the upper cover (4). Each negative pressure hole (7) is equipped with an upper rubber sleeve (9). One side of the upper rubber sleeve (9) is provided with a fixed locking buckle (10), and the other side is provided with a retractable movable locking buckle (11). The housing (5) is detachably installed with a coil, which includes a disassembly plate (13) and a plurality of plug-in sealing tubes (12) fixedly installed on it. The plug-in sealing tubes (12) correspond one-to-one with the negative pressure holes (7), and the upper end of the plug-in sealing tubes (12) is connected to a lower rubber sleeve (14). When the upper cover (4) is assembled with the housing (5), the lower rubber sleeve (14) is inserted into the upper rubber sleeve (9), and during the movement of the movable locking buckle (11) toward the fixed locking buckle (10), the upper rubber sleeve (9) and the lower rubber sleeve (14) are sealed and locked at the insertion part. The lower cover (6) is equipped with a stirring mechanism for mixing gearbox oil and fluorescent agent to form a test solution; Test cables (15) are movably inserted into each of the plug-in sealing tubes (12). The lower end of the test cable (15) extends into the lower cover (6) and is immersed in the test liquid. The upper end passes through the lower rubber sleeve (14) and is located in the upper rubber sleeve (9). By pumping air from the first connector (8) end, a negative pressure is formed to realize the anti-siphon test of electric vehicle cables.

2. The electric vehicle cable anti-siphon testing device according to claim 1, characterized in that: The upper cover (4) and the shell (5), and the lower cover (6) and the shell (5) are connected by magnetic attraction or snap-fit, and a sealing ring is provided on the contact end face. The airtightness of the test box is achieved by the mutual contact of the sealing rings.

3. The electric vehicle cable anti-siphon testing device according to claim 1 or 2, characterized in that: The upper cover (4) is further divided into an upper negative pressure space (17) and a lower negative pressure space (18) by a partition (16), and the negative pressure hole (7) is provided on the partition (16).

4. The electric vehicle cable anti-siphon testing device according to claim 3, characterized in that: The fixed locking buckle (10) is fixedly installed on the connecting seat (19), and the connecting seat (19) is fixedly installed below the partition (16).

5. The electric vehicle cable anti-siphon testing device according to claim 4, characterized in that: The outer edge of the upper cover (4) is provided with a plurality of telescopic holes (20) arranged in a ring array on one side of the lower negative pressure space (18). The telescopic holes (20) correspond one-to-one with the negative pressure holes (7). The upper cover (4) is also fixedly installed with a negative pressure piston cylinder (21) on the outside of the telescopic holes (20). The telescopic piston (22) is slidably arranged in the negative pressure piston cylinder (21). The telescopic piston (22) is fixedly connected to the movable locking buckle (11) through a connecting rod. The outer edge of the upper cover (4) is also provided with a second connector (23) on one side of the lower negative pressure space (18). During the process of the second connector (23) communicating with the gas tank (2) through the air pipe, the negative pressure generated in the lower negative pressure space (18) pushes the telescopic piston (22) and the movable locking buckle (11) to move closer to the fixed locking buckle (10), thereby achieving the sealing and locking of the upper rubber sleeve (9) and the lower rubber sleeve (14).

6. The electric vehicle cable anti-siphon testing device according to claim 5, characterized in that: The negative pressure piston cylinder (21) is connected to a traction spring (24) at one end away from the telescopic hole (20). The other end of the traction spring (24) is connected to the telescopic piston (22). The traction spring (24) pulls the telescopic piston (22) away from the telescopic hole (20) without external force, thereby releasing the sealing and locking of the upper rubber sleeve (9) and the lower rubber sleeve (14).

7. The electric vehicle cable anti-siphon testing device according to claim 6, characterized in that: The stirring mechanism includes a magnetic bead (25), a magnetic drive block (26), and a rotating impeller (27). The magnetic bead (25) is placed inside the lower cover (6), and the magnetic drive block (26) is located outside the lower cover (6) and is magnetically connected to the magnetic bead (25) in a non-contact manner. The magnetic drive block (26) and the rotating impeller (27) are coaxially fixed. The rotation of the rotating impeller (27) drives the magnetic bead (25) to move synchronously, thereby uniformly stirring the gearbox oil and fluorescent agent.

8. The method and testing device for detecting anti-siphoning of electric vehicle cables according to claim 7, characterized in that: The lower cover (6) is also detachably connected to the base (28). The base (28) has a fixed-axis rotating chamber (29) for accommodating the magnetic drive block (26) and the rotating impeller (27). The base (28) on both sides of the fixed-axis rotating chamber (29) has an air inlet (30) and an air outlet (31) that are connected internally and externally. The base (28) on the side of the air outlet (31) is also provided with a third connector (32). The third connector (32) is connected to the air storage tank (2) through an air pipe, thereby driving the rotating impeller (27) to rotate during the pumping process.

9. The electric vehicle cable anti-siphon testing device according to claim 8, characterized in that: The first connector (8), the second connector (23) and the third connector (32) adopt a universal interface of the same specification. The gas tank (2) is also equipped with a three-way connector (33). The three-way connector (33) is connected to two plug-in air pipes (35) through a solenoid valve (34). The plug-in air pipes (35) are in movable cooperation with the first connector (8), the second connector (23) and the third connector (32).

10. A method for detecting anti-siphoning in electric vehicle cables, using the anti-siphoning testing device for electric vehicle cables as described in claim 9, characterized in that, Includes the following steps: Step 1: Cut multiple wires with a length of 140mm, and use wire strippers to strip 10mm of insulation from each end of each wire to form a test cable (15). Step 2: Pour 100ml of automatic transmission fluid into the lower cover (6) and add a drop of oil-soluble fluorescent yellow dye. Then connect the housing (5) to the lower cover (6), connect the third connector (32) through the plug-in air tube (35), and start the vacuum pump (1) to exhaust the gas. The gas drives the rotating impeller (27) and the magnetic ball (25) to rotate, thereby stirring the mixed solution. Stop stirring after 1 minute to form the test solution. Step 3: Insert the test cable (15) prepared in Step 1 through the plug-in sealing tube (12), so that one end of its bottom is inserted into the test liquid, and ensure that the test liquid is immersed above the insulation layer of the test cable (15). Then cover it with the upper cover (4), so that the lower rubber sleeve (14) is inserted into the upper rubber sleeve (9). Step 4: Connect the plug-in air tube (35) to the second connector (23), start the vacuum pump (1) to perform the exhaust operation, so that negative pressure is formed in the lower negative pressure space (18). The negative pressure generated in the lower negative pressure space (18) pushes the telescopic piston (22) and the movable locking buckle (11) to move closer to the fixed locking buckle (10), thereby achieving the sealing and locking of the upper rubber sleeve (9) and the lower rubber sleeve (14). Step 5: Connect another plug-in air tube (35) to the first connector (8), and apply a vacuum of 15 kPa to the negative pressure space (17) and maintain it for 60 ± 5 min. After the test is completed, take out the test cable (15) and peel off the insulation layer of the part that has been soaked in oil to fully expose the conductor part of the test cable (15). In a dark room or dark environment, use an ultraviolet light source to irradiate the exposed conductor part to determine the climbing height of the test liquid. Determine whether the height is qualified according to the standard, and finally complete the anti-siphon test of electric vehicle cable.

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