Automatic locking seal inflation head for airtightness testing process

Abstract

An automatic locking and sealing inflator for air tightness detection process comprises an inflator body, a locking sleeve sleeved on the outer circumference of the front half of the inflator body, and a sleeve sleeved on the outer circumference of the locking sleeve, the inflator body is provided with an air passage for connecting the air inlet of the rear end face of the inflator body and the inflator nozzle cavity of the front section of the inflator body, an air cavity is provided between the locking sleeve and the inflator body, the inflator body is provided with a small air hole connecting the air cavity and the inflator nozzle cavity, the front end of the sleeve is connected to the inflator body, a spring is provided between the front end of the sleeve and the locking sleeve, the side wall of the inflator body is provided with a steel ball hole with a gradually decreasing aperture from the outside to the inside corresponding to the convex edge of the product to be detected, a steel ball is provided in the steel ball hole, a tapered inner hole is provided at the front end of the locking sleeve, and the inflator nozzle cavity is provided with a main blocking seal ring. The present invention integrates sealing and locking functions, has a stable and reliable locking effect, a compact structure, and is easy to use.

Description

Technical Field

[0001] The invention relates to the technical field of air tightness detection equipment, and in particular to an automatic locking sealing and inflating head used in an air tightness detection process. Background Art

[0002] In the prior art, when performing air-tightness testing on products, such as testing the air-tightness of fuel dispensers for automobile engines, after the products are sealed, independent fixing devices are usually used to lock the products. The fixing devices are large in size, high in cost, and require corresponding control programs. The locking devices are difficult to move and are not suitable for online applications on production lines. Existing locking devices also use compressed rubber seals for locking. When working, the friction between the rubber and the sealing surface is used to achieve locking. However, the locking force is limited by the size of the friction force, so the locking force is limited, the seal is easy to wear, the position and locking force are unstable, and it is not suitable for working at higher inflation pressures.

[0003] Therefore, there is an urgent need in the prior art for an automatic locking sealing and inflation head for use in the airtightness detection process, which integrates the sealing and locking functions, has a stable and reliable locking effect, a more compact structure, and is easier to use. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide an automatic locking sealing inflation head for use in the airtightness detection process. The sealing and locking functions are integrated into one, the locking effect is stable and reliable, the structure is more compact, and it is easier to use.

[0005] The present invention is realized through the following technical scheme: an automatic locking and sealing inflation head for use in an airtightness detection process, comprising an inflation head body, a locking sleeve which is sleeved on the outer circumference of the front half of the inflation head body and can slide back and forth, and a protective sleeve which is sleeved on the outer circumference of the locking sleeve, the front end face of the inflation head body is provided with an inflation nozzle cavity extending toward the middle section of the inflation head body, the rear end face of the inflation head body is provided with an air inlet, the inflation head body is provided with an air passage for connecting the air inlet with the inflation nozzle cavity, an air cavity is provided between the locking sleeve and the inflation head body, the locking sleeve is connected to the inflation head body at the front and rear sides of the air cavity respectively through the front sealing ring of the locking sleeve , the sealing ring behind the locking sleeve is sealed, the inflation head body is provided with a small air hole connecting the air cavity and the inflation nozzle cavity, the front end of the sleeve is connected to the inflation head body, a spring is provided between the front end of the sleeve and the locking sleeve, the side wall of the inflation head body is provided with a steel ball hole with an aperture gradually decreasing from the outside to the inside corresponding to the convex edge of the product to be detected, a steel ball is provided in the steel ball hole, the front end of the locking sleeve is provided with a tapered inner hole portion with an inner diameter gradually decreasing from front to back corresponding to the steel ball, the inflation nozzle cavity is provided with a main blocking sealing ring on the outer circumference of the inflation nozzle of the product to be detected, and the main blocking sealing ring is located between the small air hole and the convex edge of the product to be detected.

[0006] The inflation head body includes a cylindrical sealing seat and a sealing sleeve extending from the rear side of the sealing seat into the inner hole of the sealing seat, the sealing sleeve and the sealing seat have an interference fit, the air inlet is arranged at the rear end of the sealing sleeve, the airway is arranged on the sealing sleeve, the inflation nozzle cavity is arranged in the front half of the sealing seat, and the locking sleeve is arranged on the outer circumference of the front half of the sealing seat.

[0007] The front end of the sealing sleeve extends forward into the inflation nozzle cavity, the sealing seat is provided with an inner convex ring in the inflation nozzle cavity, and the main sealing ring is provided between the front end face of the sealing sleeve and the rear end face of the inner convex ring.

[0008] The front end portion of the sealing compression sleeve and the air-permeable through hole arranged opposite to each other on the sealing seat constitute the small air hole.

[0009] The outer diameter of the rear half of the locking sleeve is larger than the outer diameter of the front half of the locking sleeve, a step is formed between the outer surface of the front half of the locking sleeve and the outer surface of the rear half of the locking sleeve, the spring is sleeved on the front half of the locking sleeve, and the spring is located between the step and the front end of the sleeve.

[0010] The inner diameter of the rear half of the locking sleeve is larger than the inner diameter of the front half of the locking sleeve, a step is formed between the inner surface of the front half of the locking sleeve and the inner surface of the rear half of the locking sleeve, the outer diameter of the rear half of the sealing seat is larger than the outer diameter of the front half of the sealing seat, a step is formed between the outer surface of the front half of the sealing seat and the outer surface of the rear half of the sealing seat, the rear half of the locking sleeve is sleeved on the outer side of the step on the outer surface of the sealing seat, and the air cavity is formed between the step on the inner surface of the locking sleeve, the step on the outer surface of the sealing seat and the inner surface of the rear half of the locking sleeve.

[0011] The outer circumference of the front end portion of the sealing seat is provided with a wire retaining ring groove, a wire retaining ring is provided in the wire retaining ring groove, and the inner ring of the front end portion of the sleeve is located at the rear side of the wire retaining ring.

[0012] A sealing sleeve rear sealing ring is arranged between the inner ring of the rear end portion of the sealing seat and the sealing sleeve.

[0013] The beneficial effects of the present invention are as follows: the present invention integrates the sealing and locking functions into one, and while the working pressure gas is being filled, the working pressure gas is used to drive the locking mechanism to achieve synchronous locking, and no independent fixing device is required. The structure is more compact, the mechanical locking anti-dropping force is larger, and the locking position is very stable and reliable, which is suitable for use in a high inflation pressure environment. When the working inflation pressure is eliminated, the mechanical blocking locking device is automatically unlocked, which is convenient to use. The present invention is connected with a joint and an inflation hose for use, and the position does not need to be fixed, which is convenient for mobile use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention.

[0015] In the figure: 1-air inlet; 2-sealing sleeve; 3-sealing seat; 4-inflating port; 5-spring; 6-steel ball; 7-sheath; 8-wire retaining ring; 9-product to be tested; 10-locking sleeve; 11-front sealing ring of locking sleeve; 12-main sealing ring; 13-air cavity; 14-small air hole; 15-rear sealing ring of locking sleeve; 16-rear sealing ring of sealing sleeve; 17-conical inner hole; 18-steel ball hole; 19-airway; 20-convex edge; 21-inner convex ring. DETAILED DESCRIPTION

[0016] The present invention is described in detail below in conjunction with the accompanying drawings.

[0017] like Figure 1As shown, an automatic locking and sealing inflation head for use in an airtightness detection process comprises an inflation head body, a locking sleeve 10 which is sleeved on the outer circumference of the front half of the inflation head body and can slide back and forth, and a sheath 7 which is sleeved on the outer circumference of the locking sleeve 10. The front end face of the inflation head body is provided with an inflation nozzle cavity extending toward the middle section of the inflation head body, the rear end face of the inflation head body is provided with an air inlet 1, the inflation head body is provided with an air passage 19 for connecting the air inlet 1 with the inflation nozzle cavity, an air cavity 13 is provided between the locking sleeve 10 and the inflation head body, the locking sleeve 10 is sealed with the inflation head body at the front and rear sides of the air cavity 13 respectively through a locking sleeve front sealing ring 11 and a locking sleeve rear sealing ring 15, and the sealing of the air cavity 13 is ensured by the locking sleeve front sealing ring. The sealing ring 11 and the sealing ring 15 behind the locking sleeve are realized, the main body of the inflation head is provided with a small air hole 14 connecting the air cavity 13 and the inflation nozzle cavity, the front end of the sheath 7 is connected to the main body of the inflation head, a spring 5 is arranged between the front end of the sheath 7 and the locking sleeve 10, the side wall of the inflation head main body is provided with a steel ball hole 18 with an aperture gradually decreasing from the outside to the inside corresponding to the convex edge 20 of the product 9 to be detected, a steel ball 6 is arranged in the steel ball hole 18, the front end of the locking sleeve 10 is provided with a tapered inner hole portion 17 with an inner diameter gradually decreasing from front to back corresponding to the steel ball 6, the inflation nozzle cavity is provided with a main sealing ring 12 on the outer circumference of the inflation nozzle of the product 9 to be detected, and the main sealing ring 12 is located between the small air hole 14 and the convex edge 20 of the product 9 to be detected.

[0018] See also Figure 1 The main body of the inflation head includes a cylindrical sealing seat 3 and a sealing sleeve 2 extending from the rear side of the sealing seat 3 into the inner hole of the sealing seat 3. The sealing sleeve 2 and the sealing seat 3 are interference fit. The air inlet 1 is arranged at the rear end of the sealing sleeve 2, the airway 19 is arranged on the sealing sleeve 2, the inflation nozzle cavity is arranged in the front half of the sealing seat 3, and the locking sleeve 10 is sleeved on the outer circumference of the front half of the sealing seat 3.

[0019] The front end of the plugging sleeve 2 extends forward into the inflation nozzle cavity, and the sealing seat 3 is provided with an inner convex ring 21 in the inflation nozzle cavity, and a main plugging sealing ring 12 is provided between the front end face of the plugging sleeve 2 and the rear end face of the inner convex ring 21. The air-permeable through holes provided at the front end of the plugging sleeve 2 and the sealing seat 3 facing each other constitute a small air hole 14.

[0020] The outer diameter of the rear half of the locking sleeve 10 is larger than the outer diameter of the front half of the locking sleeve 10 , and a step is formed between the outer surface of the front half of the locking sleeve 10 and the outer surface of the rear half of the locking sleeve 10 . The spring 5 is sleeved on the front half of the locking sleeve 10 , and the spring 5 is located between the step and the front end of the sleeve 7 .

[0021] The inner diameter of the rear half of the locking sleeve 10 is larger than the inner diameter of the front half of the locking sleeve 10, a step is formed between the inner surface of the front half of the locking sleeve 10 and the inner surface of the rear half of the locking sleeve 10, the outer diameter of the rear half of the sealing seat 3 is larger than the outer diameter of the front half of the sealing seat 3, a step is formed between the outer surface of the front half of the sealing seat 3 and the outer surface of the rear half of the sealing seat 3, the rear half of the locking sleeve 10 is sleeved on the outside of the step on the outer surface of the sealing seat 3, and an air cavity 13 is formed between the step on the inner surface of the locking sleeve 10, the step on the outer surface of the sealing seat 3 and the inner surface of the rear half of the locking sleeve 10.

[0022] A wire retaining ring groove is provided on the outer circumference of the front end of the sealing seat 3, and a wire retaining ring 8 is provided in the wire retaining ring groove. The inner ring of the front end of the sleeve 7 is located at the rear side of the wire retaining ring 8. The wire retaining ring 8 can block the movement of the sleeve 7 and the spring 5. A plugging sleeve rear sealing ring 16 is provided between the inner ring of the rear end of the sealing seat 3 and the plugging sleeve 2. The sealing between the sealing seat 3 and the plugging sleeve 2 is realized by the plugging sleeve rear sealing ring 16 and the main plugging sealing ring 12.

[0023] The product 9 to be tested is, for example, a fuel distributor of an automobile engine. The fuel injection port is in a completely blocked and qualified state, leaving only the inflation port 4 of the product 9 to be tested. It is located on the assembly line, and the sealing leakage assembly quality of the product 9 to be tested is tested online after assembly.

[0024] When in use, first install the joint and the inflation hose at the air inlet 1, use the robot gripper or manually grasp the sealing seat 3, insert the inflation nozzle of the product to be tested 9 into the inflation nozzle cavity of the present invention, and the main sealing ring 12 has been compressed by the sealing sleeve 2, which can seal the inflation nozzle of the product to be tested 9. Fill the air inlet 1 with pressure gas for testing. The pressure gas enters the air cavity 13 through the air passage 19 and the small air hole 14 of the sealing sleeve 2, and the pressure gas pushes the locking sleeve 10, the spring 5 is compressed, and the locking sleeve 10 moves forward at the same time. Under the structural cooperation of the conical inner hole 17 and the steel ball 6, the steel ball 6 is continuously pressed into the steel ball hole 18, and a part of the steel ball 6 extends into the inflation nozzle cavity through the steel ball hole 18. After locking the convex ring of the product to be tested 9, the clamping hand held on the sealing seat 3 can be completely separated from the device, and then the air tightness test of the product to be tested 9 can be realized. When the working inflation pressure is eliminated, the spring 5 pushes the locking sleeve 10 to move backwards, and the larger inner diameter portion of the front section of the tapered inner hole 17 is directly opposite to the steel ball 6, and the steel ball 6 is no longer squeezed, the steel ball 6 is loosened, and the device is automatically unlocked. Then the manipulator can remove the present invention.

[0025] The present invention combines the sealing and locking functions into one. While the working pressure gas is being filled, the working pressure gas is used to drive the locking mechanism to achieve synchronous locking. There is no need to equip an independent fixing device. The structure is more compact, the mechanical locking anti-dropping force is large, and the locking position is very stable and reliable, which is suitable for use in a high inflation pressure environment. When the working inflation pressure is eliminated, the mechanical blocking locking device is automatically unlocked, which is convenient to use. The present invention is connected to a joint and an inflation hose for use, and the position does not need to be fixed, so it is easy to move and use. The present invention is particularly suitable for online use on an assembly line. A robot is used to grab the present invention, and the product 9 to be tested is inserted into the present invention for sealing and inflation locking. After that, the robot can be evacuated to achieve automatic detection, improve work efficiency, and facilitate the realization of automated online control on the production line.

[0026] The automatic sealing and locking technical principle of the present invention can be applied to the detection of various airtight trace leaks, and can be applied to the leakage detection of castings, engines, compressors, pump bodies, reducers, gear boxes, shock absorbers, fuel distributors and other devices in various industries. It can perform dry airtightness detection or precise detection of trace leaks such as helium.

[0027] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. An automatic locking sealing inflator for use in an airtightness testing process, characterized in that: The automatic locking and sealing inflation head used in the air tightness detection process comprises an inflation head body, a locking sleeve which is sleeved on the outer circumference of the front half of the inflation head body and can slide back and forth, and a sheath which is sleeved on the outer circumference of the locking sleeve. The front end face of the inflation head body is provided with an inflation nozzle cavity extending toward the middle section of the inflation head body, the rear end face of the inflation head body is provided with an air inlet, the inflation head body is provided with an air passage for connecting the air inlet and the inflation nozzle cavity, and an air cavity is provided between the locking sleeve and the inflation head body. The locking sleeve is sealed with the inflation head body at the front and rear sides of the air cavity through the front sealing ring of the locking sleeve and the rear sealing ring of the locking sleeve respectively. The inflation head body is provided with a small air hole connecting the air cavity and the inflation nozzle cavity. The front end of the sleeve is connected to the inflation head body. A spring is provided between the front end of the sleeve and the locking sleeve. The side wall of the inflation head body is provided with a steel ball hole with a gradually decreasing aperture from the outside to the inside corresponding to the convex edge of the product to be detected. A steel ball is provided in the steel ball hole. The front end of the locking sleeve corresponds to The steel ball is provided with a tapered inner hole portion whose inner diameter gradually decreases from front to back, and the inflation nozzle cavity is provided with a main plugging sealing ring corresponding to the outer circumference of the inflation nozzle of the product to be detected, and the main plugging sealing ring is located between the small air hole and the convex edge of the product to be detected; the pressure gas for detection is filled into the air inlet, and the pressure gas enters the air cavity to push the locking sleeve to move forward and compress the spring, so that the tapered inner hole portion continuously presses the steel ball against the steel ball hole, and a part of the steel ball extends into the inflation nozzle cavity through the steel ball hole to lock the product to be detected. A convex ring for detecting the product; the inflation head main body includes a cylindrical sealing seat and a sealing sleeve extending from the rear side of the sealing seat into the inner hole of the sealing seat, the sealing sleeve and the sealing seat have an interference fit, the air inlet is arranged at the rear end of the sealing sleeve, the airway is arranged at the sealing sleeve, the inflation nozzle cavity is arranged at the front half of the sealing seat, and the locking sleeve is arranged on the outer circumference of the front half of the sealing seat; the air-permeable through hole arranged at the front end of the sealing sleeve and the sealing seat opposite to each other constitutes the small air hole.

2. The automatic locking sealing and inflating head for airtightness detection process according to claim 1 is characterized in that: The outer diameter of the rear half of the locking sleeve is larger than the outer diameter of the front half of the locking sleeve, a step is formed between the outer surface of the front half of the locking sleeve and the outer surface of the rear half of the locking sleeve, the spring is sleeved on the front half of the locking sleeve, and the spring is located between the step and the front end of the sleeve.

3. The automatic locking sealing and inflating head for airtightness detection process according to claim 2 is characterized in that: The inner diameter of the rear half of the locking sleeve is larger than the inner diameter of the front half of the locking sleeve, a step is formed between the inner surface of the front half of the locking sleeve and the inner surface of the rear half of the locking sleeve, the outer diameter of the rear half of the sealing seat is larger than the outer diameter of the front half of the sealing seat, a step is formed between the outer surface of the front half of the sealing seat and the outer surface of the rear half of the sealing seat, the rear half of the locking sleeve is sleeved on the outer side of the step on the outer surface of the sealing seat, and the air cavity is formed between the step on the inner surface of the locking sleeve, the step on the outer surface of the sealing seat and the inner surface of the rear half of the locking sleeve.

4. The automatic locking sealing and inflating head for airtightness detection process according to claim 3 is characterized in that: The outer circumference of the front end portion of the sealing seat is provided with a wire retaining ring groove, a wire retaining ring is provided in the wire retaining ring groove, and the inner ring of the front end portion of the sleeve is located at the rear side of the wire retaining ring.

5. The automatic locking sealing and inflating head for airtightness detection process according to claim 4 is characterized in that: A sealing sleeve rear sealing ring is arranged between the inner ring of the rear end portion of the sealing seat and the sealing sleeve.

Images