Automobile inverter shell air tightness test equipment

Abstract

The invention discloses an air tightness test device for an automobile inverter shell, and relates to the technical field of automobile inverter air tightness detection, the air tightness test device comprises a base and an air tightness detection assembly, the base is provided with a placing assembly and two clamping units, and the two clamping units are symmetrically arranged inside and outside the shell. According to the invention, through cooperation of the clamping unit and the resisting rod, automatic clamping and positioning of the cable are realized, the problems of low efficiency and poor consistency caused by dependence on manual operation on leather cup positioning and cable insertion in a traditional test are avoided, and manual intervention is reduced; the clamping unit is used for keeping the leather cup, the cable and the axis of the positioning block coincide when the shell is separated, so that positioning drifting of the leather cup can be avoided, and adjustment time is prevented from being increased due to friction displacement.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile inverter air tightness detection, in particular to automobile inverter housing air tightness testing equipment. Background Art

[0002] The sealing of an automotive inverter housing generally 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 their waterproof and dustproof properties. The rubber cup (sealing ring) between the upper and lower housings is particularly critical for sealing the cables. In practice, rubber cups and cables vary in size and material. To ensure optimal sealing, systematic airtightness testing must be performed to determine the matching between specific rubber cups and different cables. Traditional testing methods suffer from the following technical pain points: 1. High degree of manual intervention leads to low efficiency.

[0003] The conventional operation process is: completely separate the upper and lower shells → manually thread the cables → manually place the leather cup into the installation groove → close the shell → seal the air hole and inject air for testing; in this process, the leather cup positioning, cable insertion and other links are completely dependent on manual operation, which not only has a long test cycle, but also makes it difficult to ensure operational consistency.

[0004] 2. Operational conflicts under macro separation conditions.

[0005] If the separation distance between the upper and lower shells is limited (to prevent the leather cup from falling out of the installation groove), new contradictions will arise; such as positioning drift, that is, the friction between the shell and the leather cup during relative movement can easily cause it to deviate from the preset position, increasing the difficulty of cable threading. Subsequently, the center position of the leather cup needs to be repeatedly adjusted and the cable needs to be assisted in centering, which significantly prolongs the preparation time. Summary of the Invention

[0006] The purpose of the present invention is to provide an automobile inverter housing airtightness testing device to solve the problems raised in the above background technology.

[0007] To achieve the above objectives, the present invention provides the following technical solutions: an automobile inverter housing air tightness test device, comprising a base and an air tightness detection assembly, wherein the base is provided with a placement assembly and two clamping units, wherein the two clamping units are symmetrically arranged inside and outside the housing; The clamping unit includes a positioning block, two clamping pieces that slide elastically on the positioning block, two pressure blocks and a clip arranged on the positioning block, the two clamping pieces and the two pressure blocks are symmetrically distributed up and down about the center point of the positioning block, the placement assembly is used to control the pressure block to slide along the positioning block, a first spring is fixedly connected between the pressure block and the positioning block, the end of the clamping piece is wedge-shaped, a slot is provided on the clamping piece, the clip is elastically slidably connected to the positioning block in the horizontal direction, the two pressure blocks are fixedly connected with a rack rod, the two rack rods are staggered, the rack rods are slidably connected to the positioning block and are engaged with a gear together, the two pressure blocks are fixedly connected to the two rack rods, the gear rotates inside the positioning block, and the gear is fixedly connected with a cam.

[0008] As a further solution of the present invention, the front and rear sides of the clamp are elastically slidably connected to side rods, and the insides of the side rods are elastically slidably connected to resisting rods; When the two pressing blocks move away from the positioning block, the rack rod and the gear mesh with each other, so that the cam pushes the side rod to slide to the maximum extent, and then drives the clamping piece to disengage from the clamping slot.

[0009] As a further solution of the present invention, the placement component includes an upper plate and a lower plate, and a telescopic part is fixedly connected between the base and the upper plate and the lower plate. The sides of the upper plate and the lower plate are provided with extended edges, and the extended edges can contact two external pressure blocks.

[0010] As a further solution of the present invention, the air tightness detection assembly includes several plugs, the test pipeline is fixedly connected inside the plug, the plugs are fixedly connected together, the side wall of the plug is fixedly connected to a telescopic part 2, and the telescopic part 2 is fixedly connected to the lower plate through a connecting rod.

[0011] As a further solution of the present invention, an insert rod is slidably connected to the interior of the positioning block located outside, and the insert rod is a hollow cylinder.

[0012] As a further solution of the present invention, a pressure block located inside and below the shell is threadedly connected to a first threaded rod and a second threaded rod.

[0013] As a further solution of the present invention, a rubber layer is glued to the bottom end of the clamping piece.

[0014] As a further solution of the present invention, an integral positioning piece is provided on the lower plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention realizes automatic clamping and positioning of the cable through the cooperation of the clamping unit and the resistance rod, avoiding the low efficiency and poor consistency caused by manual reliance on leather cup positioning and cable insertion in traditional tests, and reducing manual intervention; utilizing the clamping unit to keep the axes of the leather cup, cable and positioning block coincident when the shell is separated can avoid leather cup positioning drift and prevent increased adjustment time due to friction displacement; during the opening and closing process of the shell, the leather cup can be stably positioned and the cable can be quickly replaced, shortening the cycle test period and ensuring the efficiency of the sealing performance test of the automobile inverter shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a side view of the present invention; Figure 3 is a cross-sectional view of the present invention; Figure 4 This is a schematic diagram of the present invention when the upper shell and the lower shell are in contact with the pressing block but the pressing block is not squeezed; Figure 5 This is a schematic diagram of the present invention when the briquette has not descended; Figure 6 This is a schematic diagram of the clamping piece clamping the cable when the pressing block of the present invention is lowered to the limit; Figure 7 A schematic diagram of the rotation trajectory of the cam when the pressing block of the present invention is initially reset upward after being squeezed to the maximum extent; Figure 8 This is a schematic diagram of the cam of the present invention pushing the side rod to the rightmost side of the clamp; Figure 9 This is a schematic diagram of the side rod of the present invention driving the card to disengage from the card slot; Figure 10 This is a schematic diagram of the four resisting rods of the present invention resisting the leather cup; Figure 11 Schematic diagram of threaded rod 1 and threaded rod 2 of the present invention.

[0017] In the accompanying drawings, the components represented by the reference numerals are as follows: 1. Base; 101. Upper shell; 102. Lower shell; 103. Leather cup; 104. Cable; 2. Positioning block; 3. Clamping piece; 301. Second spring; 4. Pressure block; 5. Clamp; 501. Third spring; 502. Fourth spring; 6. Rack rod; 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 part 1; 17. Plug; 18. Test pipe; 19. Telescopic part 2; 20. Connecting rod; 21. Threaded rod 1; 22. Threaded rod 2; 23. Positioning piece; 24. Extended edge; 25. Air hole. DETAILED DESCRIPTION

[0018] See also Figures 1-11 The present invention provides a technical solution: an automobile inverter housing air tightness test device, comprising a base 1, an upper housing 101, a lower housing 102 (the upper housing 101 and the lower housing 102 together constitute a housing, which is distinguished and explained in this way for ease of understanding), a leather cup 103 located inside a placement groove on the upper housing 101 and the lower housing 102, a cable 104, and an air tightness detection component. The base 1 is provided with a placement component, 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 to or away from each other; The clamping unit includes a positioning block 2, two clamping pieces 3 that elastically slide on the positioning block 2, two pressure blocks 4 and a clamping piece 5 provided on the positioning block 2, the two clamping pieces 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 the pressure block 4 and the positioning block 2, the end of the clamping piece 3 is wedge-shaped, a clamping groove 10 is provided on the clamping piece 3, the clamping piece 5 is elastically slidably connected to the positioning block 2 in the horizontal direction, the two pressure blocks 4 are fixedly connected to a rack rod 6, the rack rod 6 is slidably connected to the positioning block 2 and has a gear 7 that is staggered and meshed with each other, the two pressure blocks 4 are fixedly connected to the two rack rods 6, the gear 7 rotates inside the positioning block 2, and a cam 8 is fixedly connected to the rotating shaft of the gear 7; The two positioning blocks 2 are symmetrically arranged about the right side wall of the upper shell 101 and the lower shell 102 and the leather cup 103, and 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 placement assembly includes an upper plate 14 and a lower plate 15, and a telescopic part 16 is fixedly connected between the base 1 and the upper plate 14 and the lower plate 15 (the telescopic part 16 and the telescopic part 2 19 mentioned later are both one of the cylinders, electric cylinders, and electric push rods in the prior art, and are common knowledge in the prior art, so they will not be described in detail here). The sides of the upper plate 14 and the lower plate 15 are both provided with extended edges 24, which can contact the two external pressure blocks 4.

[0019] When the placement component drives the upper shell 101 and the lower shell 102 to approach each other, the pressure blocks 4 inside the upper shell 101 and the lower shell 102 are squeezed, so that the clamping pieces 3 clamp the two ends of the cable 104, and the two pressure blocks 4 located outside the upper shell 101 and the lower shell 102 are driven by the extended edge 24, so that the four pressure blocks 4 are subjected to force at the same time; when the upper shell 101 and the lower shell 102 are away from each other to the maximum extent, the cam 8 pushes the clamping piece 5 to disengage from the card slot 10, so that the two clamping pieces 3 release the clamping of the cable 104.

[0020] The air tightness detection assembly includes several plugs 17, a test pipe 18 is fixedly connected inside the plug 17, the plugs 17 are fixedly connected together, and a telescopic part 2 19 is fixedly connected to the side wall of the plug 17, and the telescopic part 2 19 is fixedly connected to the lower plate 15 through a connecting rod 20.

[0021] like Figures 1-9 As shown: Pre-placement of positioning block 2 and leather cup 103: Figure 3 The dotted 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, and the distance between the upper shell 101 and the lower shell 102 is L (simplifying production, reducing costs, and improving assembly efficiency); Place the positioning block 2 inside the upper shell 101, and place the leather cup 103 inside the placement groove inside the upper shell 101 and the lower shell 102. At this time, the leather cup 103, the positioning block 2, the clamping unit, the upper shell 101 and the lower shell 102 become a synchronously moving whole. Then place the lower shell 102 on the lower plate 15 (at this time, the lower plate 15 and the upper plate 14 are at the initial positions of the dotted line Q and the dotted line P respectively). The telescopic member 16 is shortened to drive the upper plate 14 and the lower plate 15 to move to the position of the dotted line P1 and the dotted line Q1. At this time, the distance between the upper shell 101 and the lower shell 102 is 2n (as shown in FIG. Figure 4 At the same time, the extended edges 24 of the upper plate 14 and the lower plate 15 are in contact with the upper and lower pressure blocks 4 of the right positioning block 2, respectively, to ensure that the center points of the two positioning blocks 2 and the central axis of the leather cup 103 coincide.

[0022] The first insertion of cable 104: 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 (i.e., the positioning block 2 located on the outside) to the inside of the leather cup 103 (during the threading process, the position of the leather cup 103 inside the placement groove needs to be preliminarily adjusted to facilitate threading), so that the left end of the cable 104 passes through the two clamping pieces 3 on the right and the two clamping pieces 3 on the left respectively. After the threading is completed, the left end of the cable 104 is in the middle position of the two clamping pieces 3 on the left (i.e., located inside the upper shell 101 and the lower shell 102), and the first insertion of the cable 104 is completed.

[0023] Clamping work of cable 104: Control the upper plate 14 and the lower plate 15 to move from the dotted line P1 and the dotted line Q1 to the dotted line P2 and the dotted line Q2 (the moving distance is n). During this process, the extended edge 24 will squeeze the two pressing blocks 4 on the right side to make them close to the positioning block 2. The upper shell 101 and the lower shell 102 will squeeze the two pressing blocks 4 on the left side and compress the first spring 9. During the movement of the pressing block 4, the clamping piece 3 will be pressed down and the second spring 301 will be stretched. When the upper plate 14 and the lower plate 15 move to the dotted line P2 and the dotted line Q2 respectively, the four pressing blocks 4 are all pressed. When pressed down to the limit, the four clamping pieces 3 will clamp the cable 104 on the left and right sides of the leather cup 103. The buffering effect of the rubber layer glued to the bottom end of the clamping piece 3 can avoid damage to the surface of the cable 104. When the clamping piece 3 is pressed down to the limit, its wedge-shaped end will contact the clamp 5, and push the clamp 5 to slide to the right along the positioning block 2 and compress the third spring 501, so as to restrict the clamping piece 3 when the slot 10 coincides with the clamp 5, thereby completing the fixation of the cable 104.

[0024] Air tightness testing work: like Figure 1-Figure 3 As shown, since the connecting rod 20 is fixedly connected to the telescopic member 19 (the telescopic member 19 is also one of the air 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, so that when the upper shell 101 and the lower shell 102 are closed, the axis of the center point of the air hole 25 (that is, the air hole 25 formed by two semicircular holes after the upper shell 101 and the lower shell 102 are closed) coincides, so that when the telescopic member 19 is extended, 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 sealing; The air hole 25 can also be directly opened in a circular shape on the upper shell 101 or the lower shell 102. However, if the upper shell 101 and the lower shell 102 have the same structure, the relative position of the air hole 25 remains unchanged after the two are closed. Therefore, it is only necessary to set the plug 17 at the same height as the air hole 25. During the test, the internal space of the upper shell 101 and the lower shell 102 after the test pipe 18 is closed upward is filled with air (or vacuumed) and the pressure is maintained. The air pressure change is then monitored by monitoring equipment to determine the sealing match between the specific leather cup 103 and the cable 104 of a specific material. The equipment for air pressure detection is common knowledge among those skilled in the art and will not be described in detail here.

[0025] Positioning of cable 104 during replacement and subsequent insertion of cable 104: Take the left positioning block 2 as an example to illustrate; Figure 3As shown, after the air tightness test is completed, the upper plate 14 and the lower plate 15 are controlled to move from the dotted line P2 and the dotted line Q2 to the dotted line P1 and the dotted line Q1 respectively. At this time, the upper shell 101 and the lower shell 102 will also gradually move away from each other. During this process, the elastic relaxation of the first spring 9 will respectively drive the upper and lower pressure blocks 4 and the rack rod 6 to gradually move with the upper shell 101 and the lower shell 102, but the positioning block 2 is relatively stationary (the staggered rack rods 6 are engaged with the gear 7 during the movement, so that the two pressure blocks 4 are proportionally separated or approached during the separation or approach of the upper shell 101 and the lower shell 102, thereby achieving the stillness of the positioning block 2, and then making the axes of the clamping pieces 3 distributed above and below equal to the center points of the cable 104 and the leather cup 103, that is, the axis of the midline point of the positioning block 2 can coincide with the axis of the center point of the continuous leather cup 103 and the cable 104); during the movement of the rack rod 6, the cam 8 is driven by the engagement with the gear 7 Figure 6 Direction Figure 7 As shown in the rotation, the clamping piece 3 is locked by the engagement of the clamping slot 10 with the clamping member 5, which is used to position the left and right ends of the cable 104 respectively during the separation process of the upper shell 101 and the lower shell 102, thereby positioning the leather cup 103, so that the friction force during the separation process of the upper shell 101 and the lower shell 102 will not drive the leather cup 103 to move, but instead keep the midline points of the leather cup 103, the cable 104 and the positioning block 2 coincident, so that the pressing block 4 and the rack rod 6 will gradually move away from the clamping piece 3; When the cam 8 rotates to contact the side rod 11, it pushes the side rod 11 to slide rightward along the inside of the card 5 and stretches the fourth spring 502 (the spring rate of the fourth spring 502 is less than the spring rate of the third spring 501), while the card 5 remains stationary. When the cam 8 pushes the side rod 11 to move to the rightmost side of the card 5 (as shown in FIG. Figure 8 As shown in FIG5 ), the cam 8 continues to rotate (after rotating to the horizontal position), which will force the side rod 11 and the card 5 to move to the right. The card 5 will compress the third spring 501, so that the end of the card 5 will be disengaged from the inside of the card slot 10 (as shown in FIG5 ). Figure 9 As shown in the figure, the second spring 301 drives the clamping piece 3 to return upward, and at this time the upper shell 101 and the lower shell 102 stop after moving to the maximum extent (the upper shell 101 moves a distance n from the dotted line P2 and then stops at P1, and the lower shell 102 moves a distance n from the dotted line Q2 and then stops at Q1); At this time, the leather cup 103 is kept in the placement groove under the action of static friction, which effectively avoids positioning drift. The tested cable 104 can be directly pulled out and a new cable 104 can be inserted.

[0026] After the insertion is completed, the cable 104 is clamped, the air tightness test is carried out, the cable 104 is positioned when it is replaced, and the cable 104 is subsequently inserted to perform a cyclic test; when the upper shell 101 and the lower shell 102 are relatively close to each other next time, the cam 8 will first rotate to the left, and when the clamp 5 is driven to reset by the third spring 501, the bottom end of the pressure block 4 will press down the clamping piece 3.

[0027] The present invention, through the cooperation of two groups of positioning blocks 2 and two clamping units, enables the pressure block 4 to keep the axes of the center points of the positioning blocks 2, the leather cup 103 and the cable 104 coincident during the dynamic movement of the upper shell 101 and the lower shell 102. During the air tightness test, the inserted cable 104 is clamped by four clamping pieces 3 from the left and right sides of the leather cup 103 respectively, so as to achieve the pre-positioning of the cable 104 and the leather cup 103. When the upper shell 101 and the lower shell 102 are separated, the two positioning blocks 2, the cable 104 and the leather cup 103 remain stationary to ensure the balanced movement of the leather cup 103 relative to the upper shell 101 and the lower shell 102. After the upper shell 101 and the lower shell 102 are away from each other to the maximum extent, the clamping pieces 3 release the clamping of the cable 104, thereby avoiding the positioning drift of the leather cup 103 and the separation from the placement groove, thereby avoiding the need for multiple adjustments.

[0028] The front and rear sides of the clamp 5 are slidably connected to the side rods 11, and the fourth spring 502 is fixedly connected between the side rods 11 and the clamp 5. The inside of the side rods 11 is slidably connected to the resisting rods 12, and the fifth spring 1101 is fixedly connected between the resisting rods 12 and the inner wall of the side rods 11. When the placement assembly drives the upper shell 101 and the lower shell 102 away from each other, the two pressing blocks 4 move away from the positioning block 2, and through the engagement of the rack rod 6 and the gear 7, the cam 8 pushes the side rod 11 to slide to the maximum extent and then drives the card 5 to disengage from the card slot 10.

[0029] Secondary positioning of the leather cup 103 and auxiliary insertion of the cable 104: like Figure 7-10 As shown, during the process of separation of the upper shell 101 and the lower shell 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 to the two sides of the leather 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 leather cup 103, forming a clamping force on its left and right sides (as shown in FIG. Figure 10 As shown, the resisting rods 12 on the left and right sides respectively press against the leather cup 103 from both sides, and as the cam 8 continues to rotate, the fifth spring 1101 will continue to be compressed, thereby ensuring the stability of the positioning of the leather cup 103; As the cam 8 rotates to Figure 9 and Figure 10In the horizontal state, the upper shell 101 and the lower shell 102 will also stop after being separated by a distance of 2n. At this time, the clamping piece 3 also releases the clamping of the cable 104, but the resistance rods 12 on the left and right sides continue to resist one side of the leather cup 103, thereby ensuring that the leather cup 103 will not slide inside the placement groove after the clamping piece 3 is separated from the cable 104, and ensuring that the leather cup 103 will not be displaced inside the placement groove through the resistance of the resistance rod 12 when the cable 104 is pulled out and the new cable 104 is inserted.

[0030] The positioning block 2 located outside is slidably connected to an insert rod 13, which is a hollow cylinder.

[0031] like Figure 3 and Figure 10 As shown: Through the insertion rod 13 slidably connected to the right positioning block 2, when the resistance rod 12 resists the leather cup 103, the tested cable 104 can be directly pulled out from the interior of the leather cup 103, and then the left end of the insertion rod 13 is directly pushed into the interior of the leather cup 103 and then the new cable 104 is inserted through the interior of the insertion rod 13 to the left side of the clamping piece 3 on the left side of the leather cup 103; When the insertion rod 13 is pulled out, the new cable 104 will stay inside the leather cup 103 and the clamping piece 3, and the difficulty of inserting the cable 104 under the macro separation working condition is greatly reduced.

[0032] The pressing block 4 located at the bottom inside the upper shell 101 and the lower shell 102 is threadedly connected to the threaded rod 1 21 and the threaded rod 22 .

[0033] like Figure 3 、 Figure 4 and Figure 11 As shown: By rotating the threaded rod 1 21 and the threaded rod 2 22 , the ends of the two can resist the inner wall of the lower shell 102 , thereby providing a stable working state for the positioning block 2 located inside the upper shell 101 and the lower shell 102 .

[0034] An integral positioning piece 23 is provided on the lower plate 15 .

[0035] like Figure 1 and Figure 2 As shown: The positioning piece 23 provided on the lower plate 15 can limit the upper shell 101 through the positioning piece 23 when the upper shell 101 and the lower shell 102 are placed on the lower plate 15, thereby ensuring the initial positioning accuracy and avoiding displacement. Then, the upper plate 14 and the lower plate 15 can be directly moved from the positions of the dotted line P and the dotted line Q to the positions of the dotted line P1 and the dotted line Q1 respectively.

Claims

1. An automobile inverter housing air tightness test device, comprising a base (1) and an air tightness detection 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 shell; The clamping unit comprises a positioning block (2), two clamping pieces (3) elastically sliding on the positioning block (2), two pressure blocks (4) arranged on the positioning block (2) and a clamping member (5), the two clamping pieces (3) and the two pressure blocks (4) are symmetrically distributed up and down about the center point of the positioning block (2), the placement component is used to control the pressure block (4) to slide along the positioning block (2), a first spring (9) is fixedly connected between the pressure block (4) and the positioning block (2), the end of the clamping piece (3) is wedge-shaped, and the A card slot (10) is provided on each clamping piece (3), the card member (5) is elastically slidably connected to the positioning block (2) in the horizontal direction, the two pressing blocks (4) are fixedly connected to a rack rod (6), the two rack rods (6) are staggered, the rack rods (6) are slidably connected to the positioning block (2) and are engaged with a gear (7) together, the two pressing blocks (4) are fixedly connected to the two rack rods (6), the gear (7) rotates inside the positioning block (2), and the gear (7) is fixedly connected to a cam (8).

2. The air tightness testing equipment for automobile inverter housing according to claim 1, characterized in that: The front and rear sides of the clamp (5) are elastically slidably connected to side rods (11), and the interiors of the side rods (11) are elastically slidably connected to resisting rods (12); When the two pressing blocks (4) move away from the positioning block (2), the rack rod (6) and the gear (7) engage, causing the cam (8) to push the side rod (11) to slide to the maximum extent, and then drive the clamping member (5) to disengage from the clamping slot (10).

3. The air tightness testing equipment for automobile inverter housing according to claim 2, characterized in that: The placement assembly includes an upper plate (14) and a lower plate (15), and a telescopic member (16) is fixedly connected between the base (1) and the upper plate (14) and the lower plate (15). The sides of the upper plate (14) and the lower plate (15) are both provided with extended edges (24), and the extended edges (24) can contact the two external pressure blocks (4).

4. The air tightness testing equipment for automobile inverter housing according to claim 3, characterized in that: The air tightness detection assembly includes a plurality of plugs (17), the plugs (17) are fixedly connected to the inside of the test pipe (18), the plugs (17) are fixedly connected together, the side wall of the plug (17) is fixedly connected to a telescopic part 2 (19), and the telescopic part 2 (19) is fixedly connected to the lower plate (15) through a connecting rod (20).

5. The air tightness testing equipment for automobile inverter housing according to claim 2, characterized in that: The positioning block (2) located outside is slidably connected to an insert rod (13) inside, and the insert rod (13) is a hollow cylinder inside.

6. The air tightness testing equipment for automobile inverter housing according to claim 1, characterized in that: The pressing block (4) located inside and below the shell is threadedly connected to a threaded rod 1 (21) and a threaded rod 2 (22).

7. The air tightness testing equipment for automobile inverter housing according to claim 1, characterized in that: The bottom end of the clamping piece (3) is glued with a rubber layer.

8. The automobile inverter housing air tightness testing equipment according to claim 3, characterized in that: An integral positioning piece (23) is provided on the lower plate (15).

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