An inflatable sealing device with a special-shaped interface for airtightness testing

Abstract

The present invention relates to a special-shaped interface inflation sealing device for airtightness testing, which includes a bracket, a housing arranged on the bracket, an inflation sealing assembly arranged in the housing, and a cylinder arranged on the bracket for driving the inflation sealing assembly; the inflation sealing assembly includes a U-shaped frame with its tail connected to the driving end of the cylinder, a slider arranged in the U-shaped frame, a spring arranged between the inner end of the slider and the tail of the U-shaped frame, a guide post arranged at the outer end of the slider, a pressing block arranged at the head of the U-shaped frame and sleeved on the guide post, a pressing part arranged on the pressing block and sleeved on the guide post, a limiting part arranged at the head of the guide post with a diameter larger than that of the guide post, and a sealing ring sleeved on the guide post and located between the pressing part and the limiting part; an inflation hole is arranged in the guide post along the length direction of the guide post; since the inflation sealing mechanism of the present invention uses internal expansion for sealing, it can effectively seal the special-shaped interface, thereby improving the testing accuracy.

Description

Technical Field

[0001] The present invention relates to the field of airtightness testing, and particularly to a special-shaped interface inflatable sealing device for airtightness testing. Background Art

[0002] At present, many electronic switches require internal waterproofing. After the production of electronic switches is completed, leakage testing is required. Specifically, a leakage tester is used to inflate the inside of the electronic switch through an interface at a pressure of 20 KPa and hold the pressure for 1 S. If the electronic switch does not leak air, the product is qualified; otherwise, if the electronic switch leaks air, the product is unqualified. However, some electronic switch interfaces have special-shaped structures, resulting in poor sealing performance when the leakage tester is connected to the electronic switch interface, seriously affecting the test accuracy. Summary of the Invention

[0003] The purpose of the present invention is to provide a special-shaped interface inflatable sealing device for airtightness testing to overcome the deficiencies of the prior art.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a special-shaped interface inflatable sealing device for airtightness testing, including a bracket, a housing provided on the bracket with an open outer end, an inflatable sealing assembly provided in the housing, and a cylinder provided on the bracket for driving the inflatable sealing assembly to move towards the outer end of the housing; the inflatable sealing assembly includes a U-shaped frame with its tail connected to the driving end of the cylinder, a slider provided in the U-shaped frame, a spring provided between the inner end of the slider and the tail of the U-shaped frame, a guide post provided at the outer end of the slider, a pressing block provided at the head of the U-shaped frame and sleeved on the guide post, a pressing portion provided on the pressing block and sleeved on the guide post, a limiting member provided at the head of the guide post with a diameter larger than that of the guide post, a sealing ring sleeved on the guide post and located between the pressing portion and the limiting member, first limiting units respectively provided at the top and bottom of the slider, and second limiting units respectively provided on both sides of the slider; an inflation hole is provided in the guide post along the length direction of the guide post; an air pipe interface is provided on the slider; the air pipe interface is communicated with the inflation hole and is connected to the leakage tester through a hose.

[0005] Preferably, lubricating grooves are provided on the surfaces of the U-shaped frame, the slider, and the guide post; lubricating oil is provided in the lubricating grooves.

[0006] Preferably, the lubricating grooves are in a wavy shape.

[0007] Preferably, the limiting member is fixed to the head of the guide post by a bolt; the bolt is coaxially placed with the guide post, and a through hole communicated with the inflation hole is provided in the bolt.

[0008] Preferably, the cross section of the guide post is polygonal.

[0009] Preferably, the first limiting unit includes at least one first limiting groove disposed on the housing and placed along the moving direction of the slider, and at least one first cam follower disposed on the top or bottom of the slider and located within the first limiting groove; the second limiting unit includes at least one second limiting groove disposed on the U-shaped frame and placed along the moving direction of the slider, and at least one second cam follower disposed on the side of the slider and located within the second limiting groove.

[0010] Preferably, the housing and the U-shaped frame are correspondingly provided with covers for covering the first limiting groove and the second limiting groove.

[0011] Preferably, a T-shaped groove is provided at the driving end of the cylinder; a T-shaped member that can be snapped into the T-shaped groove is provided at the tail of the U-shaped frame.

[0012] Due to the application of the above technical solutions, the present invention has the following advantages compared with the prior art:

[0013] Since the inflatable sealing mechanism of the present invention uses internal expansion for sealing, it can effectively seal the special-shaped interface, thereby improving the test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The technical solutions of the present invention will be further described below in conjunction with the drawings:

[0015] Att Figure 1 is a schematic structural diagram of the special-shaped interface inflatable sealing device for airtightness testing according to the present invention;

[0016] Att Figure 2 is a schematic structural diagram of the special-shaped interface inflatable sealing device for airtightness testing according to the present invention after removing part of the housing;

[0017] Att Figure 3 is a schematic structural diagram of the special-shaped interface inflatable sealing device for airtightness testing according to the present invention after removing the housing;

[0018] Att Figure 4 is a schematic structural diagram of the U-shaped frame and the extrusion block in the present invention;

[0019] Att Figure 5 is a schematic structural diagram of the slider in the present invention;

[0020] Att Figure 6 is a partial working schematic diagram of the special-shaped interface inflatable sealing device for airtightness testing according to the present invention.

[0021] Wherein: 1. Bracket; 2. Cylinder; 21. T-shaped groove; 3. Housing; 4. Cover plate; 5. Inflatable sealing assembly; 50. Bolt; 501. Through hole; 51. U-shaped frame; 511. Lubricating groove; 512. T-shaped part; 52. First limiting unit; 521. First limiting groove; 522. First cam follower; 53. Second limiting unit; 531. Second limiting groove; 532. Second cam follower; 54. Extrusion block; 541. Extrusion part; 55. Slide block; 551. Air pipe interface; 56. Spring; 57. Guide post; 571. Inflation hole; 58. Sealing ring; 59. Limiting part; 6. Hose. Detailed implementation manners

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Appendix Figure 1-6The special-shaped interface inflatable sealing device for airtightness testing according to the present invention includes a bracket 1, a housing 3 provided on the bracket 1 and having an open outer end, an inflatable sealing assembly 5 provided in the housing 3, and a cylinder 2 provided on the bracket 1 for driving the inflatable sealing assembly 5 to move towards the outer end of the housing 3; the inflatable sealing assembly 5 includes a U-shaped frame 51 with its tail connected to the driving end of the cylinder 2, a slider 55 provided in the U-shaped frame 51, a spring 56 provided between the inner end of the slider 55 and the tail of the U-shaped frame 51, a guide post 57 provided at the outer end of the slider 55, a pressing block 54 provided at the head of the U-shaped frame 51 and sleeved on the guide post 57, a pressing part 541 provided on the pressing block 54 and sleeved on the guide post 57, a limiting member 59 provided at the head of the guide post 57 and having a diameter larger than that of the guide post 57, a sealing ring 58 sleeved on the guide post 57 and located between the pressing part 541 and the limiting member 59, first limiting units 52 respectively provided at the top and bottom of the slider 55, and second limiting units 53 respectively provided on both sides of the slider 55; an inflatable hole 571 is provided in the guide post 57 along the length direction of the guide post 57; an air pipe interface 551 is provided on the slider 55; the air pipe interface 551 is communicated with the inflatable hole 571 and is connected to an f620 leak tester through a hose 6; during operation: the cylinder 2 drives the inflatable sealing assembly 5 to move towards the product. When the sealing ring 58 enters the product interface, the first limiting unit 52 limits the slider 55 to prevent the limiting member 59, the guide post 57 and the slider 55 from continuing to move towards the product. Since a spring 56 is provided between the inner end of the slider 55 and the tail of the U-shaped frame 51, and the pressing block 54 is sleeved on the guide post 57, when the cylinder 2 continues to drive the U-shaped frame 51 to move towards the product, the U-shaped frame 51 will drive the pressing block 54 to squeeze the sealing ring 58 through the pressing part 541, so that the sealing ring 58 deforms and expands outwards to contact the inner wall of the product interface to achieve sealing. At this time, the second limiting unit 53 limits the U-shaped frame 51 to prevent the pressing part 541 from continuing to squeeze and damage the sealing ring 58; finally, the f620 leak tester inflates the product through the hose 6 and the guide post 57 in sequence for testing.

[0024] Furthermore, lubricating grooves 511 are provided on the surfaces of the U-shaped frame 51, the slider 55 and the guide post 57; solid lubricating oil is provided in the lubricating grooves 511 to achieve a lubricating effect and improve the service life of the inflatable sealing assembly 5.

[0025] Furthermore, the lubricating grooves 511 are in a wavy shape, and the lubricating effect is better.

[0026] Furthermore, the limiting member 59 is fixed to the head of the guide post 57 by a bolt 50; the bolt 50 is coaxially placed with the guide post 57, and a through hole 501 communicated with the inflatable hole 571 is provided in the bolt 50; this structure not only facilitates the installation and maintenance of the limiting member 59, but also makes the overall structure more compact.

[0027] Furthermore, the cross-section of the guide post 57 is rectangular, facilitating the machining of lubricating grooves 511 on the surface.

[0028] Furthermore, the first limiting unit 52 includes two first limiting grooves 521 arranged on the housing 3 and placed along the moving direction of the slider 55, and four first cam followers 522 arranged on the top or bottom of the slider 55 and distributed in the first limiting grooves 521; the second limiting unit 53 includes a second limiting groove 531 arranged on the U-shaped frame 51 and placed along the moving direction of the slider 55, and two second cam followers 532 arranged on the side of the slider 55 and located in the second limiting groove 531; during operation: since the first limiting groove 521 and the second limiting groove 531 are strip-shaped, the first cam followers 522 and the second cam followers 532 can only slide correspondingly within the first limiting groove 521 and the second limiting groove 531, playing a limiting role; wherein the movement ranges of the slider 55 and the U-shaped frame 51 are determined by the lengths of the first limiting groove 521 and the second limiting groove 531, and the movement ranges of the slider 55 and the U-shaped frame 51 can be changed by adjusting the lengths of the first limiting groove 521 and the second limiting groove 531.

[0029] Furthermore, a cover plate 4 for covering the first limiting groove 521 and the second limiting groove 531 is correspondingly arranged on the housing 3 and the U-shaped frame 51, playing a sealing role to prevent dust, sundries, etc. from falling into the pneumatic sealing assembly 5, reducing wear and providing service life.

[0030] Furthermore, a T-shaped groove 21 is arranged at the driving end of the cylinder 2; a T-shaped part 512 that can be clamped into the T-shaped groove 21 is arranged at the tail of the U-shaped frame 51, facilitating quick replacement and maintenance.

[0031] The above are only specific application examples of the present invention, which do not constitute any limitation to the protection scope of the present invention. Any technical solutions formed by equivalent transformation or equivalent substitution fall within the scope of the protection of the present invention.

Claims

1. An inflatable sealing device with a special-shaped interface for airtightness testing, characterized in that: It includes a bracket, a housing provided on the bracket and having an open outer end, an inflatable sealing assembly provided in the housing, and a cylinder provided on the bracket for driving the inflatable sealing assembly to move in the direction of the outer end of the housing; The inflatable sealing assembly includes a U-shaped frame with its tail connected to the driving end of the cylinder, a slider provided in the U-shaped frame, a spring provided between the inner end of the slider and the tail of the U-shaped frame, a guide post provided at the outer end of the slider, a pressing block provided at the head of the U-shaped frame and sleeved on the guide post, a pressing portion provided on the pressing block and sleeved on the guide post, a limiting member provided at the head of the guide post and having a diameter larger than that of the guide post, a sealing ring sleeved on the guide post and located between the pressing portion and the limiting member, first limiting units respectively provided on the top and bottom of the slider, and second limiting units respectively provided on both sides of the slider; an inflation hole is provided in the guide post along the length direction of the guide post; an air pipe interface is provided on the slider; the air pipe interface is communicated with the inflation hole and is connected to a leak tester through a hose; The first limiting unit includes at least one first limiting groove provided on the housing and placed along the moving direction of the slider, and at least one first cam follower provided on the top or bottom of the slider and located in the first limiting groove; the second limiting unit includes at least one second limiting groove provided on the U-shaped frame and placed along the moving direction of the slider, and at least one second cam follower provided on the side of the slider and located in the second limiting groove; A T-shaped groove is provided at the driving end of the cylinder; a T-shaped member that can be snapped into the T-shaped groove is provided at the tail of the U-shaped frame.

2. The special-shaped interface inflatable sealing device for airtightness testing according to claim 1, characterized in that: Lubricating grooves are provided on the surfaces of the U-shaped frame, the slider and the guide post; lubricating oil is provided in the lubricating grooves.

3. The special-shaped interface inflatable sealing device for airtightness testing according to claim 2, characterized in that: The lubricating grooves are wavy.

4. The special-shaped interface inflatable sealing device for airtightness testing according to claim 3, characterized in that: The limiting member is fixed to the head of the guide post by a bolt; the bolt is coaxially placed with the guide post, and a through hole communicated with the inflation hole is provided in the bolt.

5. The special-shaped interface inflatable sealing device for airtightness testing according to claim 4, characterized in that: The cross section of the guide post is polygonal.

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