Automobile inverter shell air tightness test equipment

Abstract

This invention discloses an airtightness testing device for an automotive inverter housing, relating to the field of automotive inverter airtightness testing technology. It includes a base and an airtightness testing assembly. The base is equipped with a placement component and two clamping units, which are symmetrically arranged inside and outside the housing. This invention achieves automatic clamping and positioning of cables through the cooperation of the clamping units and the resisting rod, avoiding the low efficiency and poor consistency problems caused by manual positioning of the cup and cable threading in traditional testing, thus reducing human intervention. By using the clamping units to keep the axes of the cup, cable, and positioning block aligned when the housing is separated, it prevents cup positioning drift and avoids increased adjustment time due to frictional displacement.

Description

Technical Field

[0001] This invention relates to the field of automotive inverter airtightness testing technology, specifically to an automotive inverter housing airtightness testing device. Background Technology

[0002] The airtightness of an automotive inverter housing typically refers to the ability of external gases or liquids to penetrate the seals and enter the interior of the upper and lower housings, directly affecting its waterproof and dustproof performance. The sealing rings (lip seals) installed between the upper and lower housings are particularly crucial for sealing the cables running through them. Due to the diverse specifications (different sizes and materials) of the sealing rings and cables in practical applications, a systematic airtightness test must be conducted to ensure optimal sealing performance, specifically testing the compatibility of particular sealing rings with different cables. Traditional testing methods suffer from the following technical limitations:

[0003] First, high levels of human intervention lead to low efficiency.

[0004] The standard operating procedure is as follows: completely separate the upper and lower shells → manually thread the cables → manually place the diaphragm cup into the mounting slot → close the shell → seal the air hole and inject air for testing; in this process, the positioning of the diaphragm cup and the insertion of cables are entirely dependent on manual operation, which not only makes the testing cycle long, but also makes it difficult to ensure the consistency of operation.

[0005] II. Operational conflicts under micro-separation conditions.

[0006] If the separation distance between the upper and lower shells is limited (to prevent the diaphragm from coming out of the mounting slot), new problems will arise. For example, positioning drift, that is, the friction between the shell and the diaphragm during relative movement can easily cause it to deviate from the preset position, increasing the difficulty of cable installation. Subsequently, the center position of the diaphragm needs to be repeatedly adjusted and the cable needs to be aligned, which significantly prolongs the preparation time. Summary of the Invention

[0007] The purpose of this invention is to provide an airtightness testing device for automotive inverter housings to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an airtightness testing device for an automotive inverter housing, comprising a base and an airtightness testing component, wherein the base is provided with a placement component and two clamping units, the two clamping units being symmetrically arranged inside and outside the housing;

[0009] The clamping unit includes a positioning block, two clamping plates that slide elastically on the positioning block, two pressure blocks disposed on the positioning block, and a locking component. The two clamping plates and the two pressure blocks are symmetrically distributed vertically about the center point of the positioning block. The placement component is used to control the pressure blocks to slide along the positioning block. A first spring is fixedly connected between each pressure block and the positioning block. The ends of the clamping plates are wedge-shaped, and each clamping plate has a slot. The locking component is elastically slidably connected to the positioning block in the horizontal direction. Each of the two pressure blocks is fixedly connected to a rack rod, and the two rack rods are staggered. Each rack rod is slidably connected to the positioning block and meshes with a gear. The two pressure blocks are fixedly connected to the two rack rods. The gear rotates inside the positioning block, and a cam is fixedly connected to the gear.

[0010] As a further embodiment of the present invention, the front and rear sides of the card are elastically slidably connected with side rods, and the side rods are elastically slidably connected with resistance rods inside each side rod.

[0011] When the two pressure blocks move away from the positioning block, the rack and pinion mesh with the gear, causing the cam to push the side rod to slide to its maximum extent, which then drives the locking piece to disengage from the locking slot.

[0012] As a further embodiment of the present invention, the placement assembly includes an upper plate and a lower plate, and a telescopic member is fixedly connected between the base and both the upper plate and the lower plate. The upper plate and the lower plate are provided with extension edges on their sides, and the extension edges can contact two external pressure blocks.

[0013] As a further embodiment of the present invention, the airtightness testing component includes a plurality of plugs, a test pipeline is fixedly connected inside the plugs, the plugs are fixedly connected together, and a second telescopic member is fixedly connected to the side wall of the plug, the second telescopic member being fixedly connected to the lower plate via a connecting rod.

[0014] As a further aspect of the present invention, an insert rod is slidably connected inside the external positioning block, and the insert rod is a hollow cylinder.

[0015] As a further embodiment of the present invention, the pressure block located inside the housing and at the bottom is threadedly connected to threaded rod one and threaded rod two.

[0016] As a further embodiment of the present invention, a rubber layer is bonded to the bottom end of the clamping piece.

[0017] As a further embodiment of the present invention, an integral positioning piece is provided on the lower plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This invention achieves automatic clamping and positioning of cables through the cooperation of a clamping unit and a resisting rod, avoiding the low efficiency and poor consistency problems caused by manual positioning of the cup and cable insertion in traditional testing, and reducing human intervention. By using the clamping unit to keep the axes of the cup, cable and positioning block aligned when the housing is separated, the positioning of the cup can be prevented from drifting and the adjustment time increased due to friction displacement can be prevented. Stable positioning of the cup and rapid cable replacement are achieved during the opening and closing of the housing, shortening the cycle test and ensuring the high efficiency of the sealing performance test of the automotive inverter housing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a side view of the present invention;

[0022] Figure 3 This is a cross-sectional view of the present invention;

[0023] Figure 4 This is a schematic diagram of the upper and lower housings of the present invention in contact with the pressure block but without pressing the pressure block;

[0024] Figure 5 This is a schematic diagram of the present invention when the pressure block has not descended;

[0025] Figure 6 This is a schematic diagram showing the clamping plate clamping the cable when the pressure block of the present invention descends to its limit.

[0026] Figure 7 This is a schematic diagram of the rotation trajectory of the cam when the pressure block of the present invention is initially reset upward after being squeezed to its maximum extent;

[0027] Figure 8 This is a schematic diagram of the cam of the present invention pushing the side rod to the far right of the clamp;

[0028] Figure 9 This is a schematic diagram of the side rod driving the locking component to disengage from the slot according to the present invention;

[0029] Figure 10 This is a schematic diagram of the four resistance rods resisting the leather cup according to the present invention;

[0030] Figure 11 This is a schematic diagram of threaded rod one and threaded rod two of the present invention.

[0031] In the attached diagram, the components represented by each number are as follows:

[0032] 1. Base; 101. Upper shell; 102. Lower shell; 103. Leather cup; 104. Cable; 2. Positioning block; 3. Clamping plate; 301. Second spring; 4. Pressure block; 5. Clip; 501. Third spring; 502. Fourth spring; 6. Rack and pinion; 7. Gear; 8. Cam; 9. First spring; 10. Slot; 11. Side rod; 1101. Fifth spring; 12. Resistance rod; 13. Insert rod; 14. Upper plate; 15. Lower plate; 16. Telescopic component one; 17. Plug; 18. Test pipeline; 19. Telescopic component two; 20. Connecting rod; 21. Threaded rod one; 22. Threaded rod two; 23. Positioning plate; 24. Extension edge; 25. Air hole. Detailed Implementation

[0033] Please see Figures 1-11 The present invention provides a technical solution: an airtightness testing device for an automotive inverter housing, comprising a base 1, an upper housing 101, a lower housing 102 (the upper housing 101 and the lower housing 102 together constitute the housing, and are distinguished and described accordingly for ease of understanding), a diaphragm cup 103 located inside the mounting grooves on the upper housing 101 and the lower housing 102, a cable 104, and an airtightness testing component. A placement component is provided on the base 1, which is used to support the upper housing 101 and the lower housing 102 and drive the upper housing 101 and the lower housing 102 to move closer and further apart.

[0034] The clamping unit includes a positioning block 2, two clamping plates 3 that slide elastically on the positioning block 2, two pressure blocks 4 that are set on the positioning block 2, and a locking piece 5. The two clamping plates 3 and the two pressure blocks 4 are symmetrically distributed about the center point of the positioning block 2. A first spring 9 is fixedly connected between each pressure block 4 and the positioning block 2. The end of each clamping plate 3 is wedge-shaped and a slot 10 is provided on each clamping plate 3. The locking piece 5 is elastically slidably connected to the positioning block 2 in the horizontal direction. Each of the two pressure blocks 4 is fixedly connected to a rack rod 6. Each rack rod 6 is slidably connected to the positioning block 2 and is interlocked with a gear 7. The two pressure blocks 4 are fixedly connected to the two rack rods 6. The gear 7 rotates inside the positioning block 2. A cam 8 is fixedly connected to the rotating shaft of the gear 7.

[0035] Two positioning blocks 2 are symmetrically arranged about the right side walls of the upper shell 101 and the lower shell 102 and the leather cup 103. The positioning block 2 located on the right side (i.e. outside the upper shell 101 and the lower shell 102) is fixedly connected to the base 1. The mounting assembly includes an upper plate 14 and a lower plate 15. A telescopic component 16 is fixedly connected between the base 1 and the upper plate 14 and the lower plate 15 (the telescopic component 16 and the telescopic component 29 mentioned later are all types of cylinders, electric cylinders, and electric push rods in the prior art, which are common knowledge in the prior art and will not be described in detail here). The upper plate 14 and the lower plate 15 are provided with extension edges 24 on their sides. The extension edges 24 can contact the two pressure blocks 4 on the outside.

[0036] As the upper housing 101 and lower housing 102 approach each other, the pressure blocks 4 inside the upper housing 101 and lower housing 102 are squeezed, causing the clamping plates 3 to clamp the two ends of the cable 104. The two pressure blocks 4 located outside the upper housing 101 and lower housing 102 are driven by the extension edge 24, so that the four pressure blocks 4 are subjected to force simultaneously. When the upper housing 101 and lower housing 102 move away from each other to the maximum extent, the cam 8 pushes the card 5 to disengage from the card slot 10, thereby releasing the clamping plates 3 from clamping the cable 104.

[0037] The airtightness testing assembly includes several plugs 17, with test pipelines 18 fixedly connected inside the plugs 17. The plugs 17 are all fixedly connected together, and a second telescopic component 19 is fixedly connected to the side wall of the plugs 17. The second telescopic component 19 is fixedly connected to the lower plate 15 through a connecting rod 20.

[0038] like Figures 1-9 As shown:

[0039] Pre-installation of positioning block 2 and leather cup 103:

[0040] Figure 3 The dashed lines P and Q represent the initial positions of the upper plate 14 and the lower plate 15 when they are not close to each other, while the distance between the upper shell 101 and the lower shell 102 is L (simplifying production, reducing costs, and improving assembly efficiency).

[0041] Positioning block 2 is placed inside upper housing 101, and cup 103 is placed inside the mounting slots of upper housing 101 and lower housing 102. At this time, cup 103, positioning block 2, clamping unit, upper housing 101 and lower housing 102 become a synchronously moving whole. Then, lower housing 102 is placed on lower plate 15 (at this time, lower plate 15 and upper plate 14 are at the initial positions of dashed line Q and dashed line P, respectively). The upper plate 14 and lower plate 15 are moved to the positions of dashed line P1 and dashed line Q1 by shortening the telescopic component 16. At this time, the distance between upper housing 101 and lower housing 102 is 2n (e.g., ...). Figure 4(as shown); at the same time, the extended edges 24 of the upper plate 14 and the lower plate 15 respectively contact the upper and lower pressure blocks 4 of the right positioning block 2, ensuring that the center points of the two positioning blocks 2 and the central axis of the leather cup 103 coincide.

[0042] The first insertion of cable 104:

[0043] like Figure 4 As shown, the left end of the cable 104 is passed through the middle position of the positioning block 2 on the right side (i.e., the positioning block 2 located on the outside) into the cup 103 (during the wire threading process, the position of the cup 103 inside the placement groove needs to be initially adjusted to facilitate wire threading). After the left end of the cable 104 passes through, it passes through the two clamping pieces 3 on the right side and the two clamping pieces 3 on the left side respectively. After the wire threading is completed, the left end of the cable 104 is in the middle position of the two clamping pieces 3 on the left side (i.e., located inside the upper housing 101 and the lower housing 102). At this time, the first insertion of the cable 104 is completed.

[0044] The clamping operation of cable 104:

[0045] The upper plate 14 and lower plate 15 are controlled to move from dashed lines P1 and Q1 to dashed lines P2 and Q2 (the distance moved is n). During this process, the extended edge 24 will squeeze the two pressure blocks 4 on the right side, making them move closer to the positioning block 2. The upper shell 101 and lower shell 102 will squeeze the two pressure blocks 4 on the left side and compress the first spring 9. During the movement of the pressure blocks 4, they will press down the clamping plate 3 and stretch the second spring 301. When the upper plate 14 and lower plate 15 move to dashed lines P2 and Q2 respectively, all four pressure blocks 4 are... When pressed down to its limit, the four clamping plates 3 will hold the cable 104 tightly on both sides of the cup 103. The rubber layer glued to the bottom of the clamping plate 3 acts as a buffer to prevent damage to the surface of the cable 104. During the process of the clamping plate 3 being pressed down to its limit, its wedge-shaped end will contact the locking piece 5 and push the locking piece 5 to slide to the right along the positioning block 2 and compress the third spring 501. Thus, when the locking slot 10 and the locking piece 5 coincide, the clamping plate 3 is restricted, thereby completing the fixation of the cable 104.

[0046] Air tightness testing:

[0047] like Figures 1-3As shown, since the connecting rod 20 is fixedly connected to the telescopic component 19 (the telescopic component 19 is also one of the cylinders, electric cylinders, and electric push rods in the prior art, which will not be described in detail here), the plug 17 can move synchronously with the lower plate 15. Thus, when the upper shell 101 and the lower shell 102 are closed, the plug 17 coincides with the axis of the center point of the air hole 25 (that is, the air hole 25 formed by two semi-circular holes after the upper shell 101 and the lower shell 102 are closed). Thus, when the telescopic component 19 extends, it enters the interior of the air hole 25 to seal the air hole 25. The plug 17 is conical and its surface is made of rubber material, thereby achieving a seal.

[0048] The opening position of the vent 25 can also be directly opened in a circle on the upper shell 101 or the lower shell 102. However, under the condition that the upper shell 101 and the lower shell 102 have the same structure, the relative position of the vent 25 remains unchanged after they are closed. Therefore, it is only necessary to set the height of the plug 17 to be the same as that of the vent 25.

[0049] During testing, air is injected (or evacuated) into the internal space of the upper housing 101 and lower housing 102 after the test pipeline 18 is closed upwards, and pressure is maintained. The sealing matching degree between a specific cup 103 and a cable 104 of a specific material can be determined by monitoring the air pressure change through the monitoring equipment. The air pressure testing equipment is common knowledge to those skilled in the art and will not be described in detail here.

[0050] Positioning of cable 104 during replacement and subsequent cable threading:

[0051] Let's take the left-side positioning block 2 as an example; for example Figure 3 As shown, after the airtightness test is completed, the upper plate 14 and the lower plate 15 are controlled to move from the dashed lines P2 and Q2 to the dashed lines P1 and Q1 respectively. At this time, the upper housing 101 and the lower housing 102 will also gradually move away from each other. During this process, the elastic relaxation of the first spring 9 will drive the upper and lower pressure blocks 4 and the rack rod 6 to move gradually with the upper housing 101 and the lower housing 102, but the positioning block 2 remains relatively stationary (the staggered rack rod 6 meshes with the gear 7 during the movement, so that the two pressure blocks 4 move away or closer proportionally during the separation or approach of the upper housing 101 and the lower housing 102, thereby achieving the stationary position of the positioning block 2, and thus making the axis of the clamping plate 3 and the cable 104 and the center point of the cup 103 equal, that is, the axis of the center point of the positioning block 2 can coincide with the axis of the center point of the cup 103 and the cable 104); during the movement of the rack rod 6, the cam 8 is driven by meshing with the gear 7. Figure 6 As shown Figure 7As shown, the clamping plate 3 is locked by the engagement of the slot 10 and the card 5, which is used to position the left and right ends of the cable 104 respectively during the separation of the upper housing 101 and the lower housing 102, thereby positioning the cup 103. The friction force during the separation of the upper housing 101 and the lower housing 102 will not cause the cup 103 to move, but will keep the center point of the cup 103, the cable 104 and the positioning block 2 coincide. Therefore, the pressure block 4 and the rack rod 6 will gradually move away from the clamping plate 3.

[0052] When cam 8 rotates to contact side rod 11, it pushes side rod 11 to slide to the right along the inside of clamp 5 and stretches fourth spring 502 (the spring constant of fourth spring 502 is less than the spring constant of third spring 501), while clamp 5 remains stationary. When cam 8 pushes side rod 11 to the rightmost side inside clamp 5 (e.g., Figure 8 As shown), as cam 8 continues to rotate (after rotating to a horizontal position), it will forcibly push side rod 11 and locking piece 5 to move to the right. Locking piece 5 will compress the third spring 501, thereby causing the end of locking piece 5 to disengage from the inside of the locking slot 10 (as shown). Figure 9 As shown), the second spring 301 drives the clamping plate 3 to return to its original position. At this time, the upper housing 101 and the lower housing 102 will stop after moving to their maximum extent (the upper housing 101 moves n distances from the dashed line P2 and stops at P1, and the lower housing 102 moves n distances from the dashed line Q2 and stops at Q1).

[0053] At this time, the cup 103 is held in the placement groove under the action of static friction, effectively avoiding positioning drift, and the tested cable 104 can be directly pulled out and a new cable 104 can be inserted.

[0054] After insertion, the clamping of cable 104, air tightness test, positioning when replacing cable 104, and subsequent insertion of cable 104 are performed in sequence to perform cyclic testing; during the next relative approach between upper housing 101 and lower housing 102, cam 8 will first rotate to the left, and after the clamping piece 5 is reset by the third spring 501, the bottom end of the pressure block 4 will press down the clamping piece 3.

[0055] This invention, through the cooperation of two sets of positioning blocks 2 and two clamping units, ensures that the center points of the positioning blocks 2, the cup 103, and the cable 104 remain aligned during the dynamic movement of the upper housing 101 and the lower housing 102. During airtightness testing, four clamping plates 3 clamp the inserted cable 104 from the left and right sides of the cup 103, achieving pre-positioning of the cable 104 and the cup 103. When the upper housing 101 and the lower housing 102 separate, the stationary position of the two positioning blocks 2, the cable 104, and the cup 103 ensures balanced movement of the cup 103 relative to the upper housing 101 and the lower housing 102. After the upper housing 101 and the lower housing 102 move away from each other to the maximum extent, the clamping plates 3 release the clamping on the cable 104, thereby preventing the cup 103 from drifting or falling out of the mounting slot and avoiding the need for multiple adjustments.

[0056] The front and rear sides of the clip 5 are slidably connected with side rods 11. A fourth spring 502 is fixedly connected between the side rods 11 and the clip 5. A resisting rod 12 is slidably connected inside the side rods 11. A fifth spring 1101 is fixedly connected between the resisting rod 12 and the inner wall of the side rod 11.

[0057] When the placement component moves the upper housing 101 and the lower housing 102 away from each other, the two pressure blocks 4 move away from the positioning block 2. Through the meshing of the rack rod 6 and the gear 7, the cam 8 pushes the side rod 11 to slide to the maximum extent, which then drives the locking piece 5 to disengage from the slot 10.

[0058] Secondary positioning of the diaphragm cup 103 and auxiliary insertion of the cable 104:

[0059] like Figures 7-10 As shown, during the separation of the upper housing 101 and the lower housing 102, when the cam 8 contacts the side rod 11, it will directly push the side rod 11 and the resisting rod 12 to move towards both sides of the cup 103. Before the side rod 11 moves to the rightmost side of the clamp 5, the end of the resisting rod 12 will contact the cup 103, forming a clamp on its left and right sides (as shown). Figure 10 As shown, the resisting rods 12 on the left and right sides press against the leather cup 103 from both sides, and as the cam 8 continues to rotate, the fifth spring 1101 will be continuously compressed, thereby ensuring the stability of the leather cup 103 positioning.

[0060] As cam 8 rotates to... Figure 9 and Figure 10When the upper housing 101 and the lower housing 102 are in a horizontal state, they will stop after being separated by a distance of 2n. At this time, the clamping plate 3 will also release the clamp on the cable 104. However, the resisting rods 12 on the left and right sides will continue to resist one side of the cup 103, thereby ensuring that the cup 103 will not slide inside the placement groove after the clamping plate 3 is separated from the cable 104. It also ensures that the cup 103 will not be displaced inside the placement groove when the cable 104 is pulled out or when a new cable 104 is inserted, due to the resistance of the resisting rods 12.

[0061] The positioning block 2 located on the outside has a sliding connection to the insertion rod 13, which is a hollow cylinder.

[0062] like Figure 3 and Figure 10 As shown:

[0063] By using the plug rod 13 which is slidably connected to the right positioning block 2, when the resisting rod 12 resists the cup 103, the tested cable 104 can be directly pulled out from the inside of the cup 103. Then, the left end of the plug rod 13 is pushed into the inside of the cup 103, and then the new cable 104 is inserted into the left side of the clamping piece 3 on the left side of the cup 103 through the inside of the plug rod 13.

[0064] When the insertion rod 13 is pulled out, the new cable 104 will stay inside the cup 103 and the clamping plate 3, which greatly reduces the difficulty of inserting the cable 104 in the micro-separation condition.

[0065] The pressure block 4 located inside the upper housing 101 and the lower housing 102 is threadedly connected to threaded rod 21 and threaded rod 22.

[0066] like Figure 3 , Figure 4 and Figure 11 As shown:

[0067] By rotating threaded rod 21 and threaded rod 22, the ends of both can resist the inner wall of the lower housing 102, thereby providing a stable working state for the positioning block 2 located inside the upper housing 101 and the lower housing 102.

[0068] An integral positioning piece 23 is provided on the lower plate 15.

[0069] like Figure 1 and Figure 2 As shown:

[0070] The positioning piece 23 provided on the lower plate 15 can restrict the upper shell 101 when the upper shell 101 and the lower shell 102 are placed on the lower plate 15, so as to ensure the initial positioning accuracy and avoid displacement. Then, the upper plate 14 and the lower plate 15 can be moved directly from the positions of the dashed lines P and Q to the positions of the dashed lines P1 and Q1, respectively.

Claims

1. A device for testing the airtightness of an automotive inverter housing, comprising a base (1) and an airtightness testing component, characterized in that, The base (1) is provided with a placement component and two clamping units, and the two clamping units are symmetrically arranged inside and outside the housing; The clamping unit includes a positioning block (2), two clamping plates (3) that slide elastically on the positioning block (2), two pressure blocks (4) set on the positioning block (2), and a locking element (5). The two clamping plates (3) and the two pressure blocks (4) are symmetrically distributed about the center point of the positioning block (2). The placement component is used to control the pressure blocks (4) to slide along the positioning block (2). A first spring (9) is fixedly connected between the pressure blocks (4) and the positioning block (2). The ends of the clamping plates (3) are wedge-shaped. Each clamping piece (3) has a slot (10) provided. The clamping piece (5) is elastically slidably connected to the positioning block (2) in the horizontal direction. Each of the two pressure blocks (4) is fixedly connected to a rack rod (6). The two rack rods (6) are staggered. Each rack rod (6) is slidably connected to the positioning block (2) and meshes with a gear (7). The two pressure blocks (4) are fixedly connected to the two rack rods (6). The gear (7) rotates inside the positioning block (2). The gear (7) is fixedly connected to a cam (8). The card (5) has side rods (11) elastically slidably connected to both the front and rear sides, and the side rods (11) have resistance rods (12) elastically slidably connected inside. When the two pressure blocks (4) move away from the positioning block (2), the rack rod (6) meshes with the gear (7) so that the cam (8) pushes the side rod (11) to slide to the maximum extent, and then drives the clamp (5) to disengage from the slot (10).

2. The automotive inverter housing airtightness testing equipment according to claim 1, characterized in that: The placement assembly includes an upper plate (14) and a lower plate (15). The base (1) is fixedly connected to the upper plate (14) and the lower plate (15) with a telescopic component (16). The upper plate (14) and the lower plate (15) are provided with extension edges (24) on their sides. The extension edges (24) can contact the two external pressure blocks (4).

3. The automotive inverter housing airtightness testing equipment according to claim 2, characterized in that: The airtightness testing component includes several plugs (17), and a test pipeline (18) is fixedly connected inside the plug (17). The plugs (17) are fixedly connected together, and a telescopic component (19) is fixedly connected to the side wall of the plug (17). The telescopic component (19) is fixedly connected to the lower plate (15) through a connecting rod (20).

4. The automotive inverter housing airtightness testing equipment according to claim 1, characterized in that: The positioning block (2) located on the outside has a sliding connection to a plug rod (13), which is a hollow cylinder.

5. The automotive inverter housing airtightness testing equipment according to claim 1, characterized in that: The pressure block (4) located inside the housing and below is threadedly connected to threaded rod one (21) and threaded rod two (22).

6. The automotive inverter housing airtightness testing equipment according to claim 1, characterized in that: The bottom end of the clamping piece (3) is glued with a rubber layer.

7. The automotive inverter housing airtightness testing equipment according to claim 2, characterized in that: An integral positioning piece (23) is provided on the lower plate (15).

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