External quick connector

Abstract

The present invention provides an external-embracing quick connector, wherein the upper end of a first shell is sealedly connected to the lower end of a second shell, a piston is arranged inside the second shell, and the outer periphery of the piston is slidably connected to the inner ring of the second shell, the inner ring of the piston is slidably connected to the outer periphery of a pipe fitting, a claw is installed at the lower end of the piston, the inner ring of the claw is contact-connected to the outer periphery of the pipe fitting, the pipe fitting is filled with compressed air, the compressed air is the displacement power of the piston and the second shell, the piston and the second shell are both axially displaced and relatively moved, the outer periphery of the claw is slidably connected to the inner ring of the first shell, and the second shell is provided with a detection hole. The external-embracing quick connector described in the present invention utilizes the high-pressure medium inside the pipe fitting to make the claw and the first shell move relative to each other, so that the inner ring of the claw grasps the outer periphery of the pipe fitting, the greater the medium pressure inside the pipe fitting, the firmer the connection between the claw and the pipe fitting, thereby achieving the sealing of the pipe fitting under high-pressure working conditions, and the operation is simple and the reliability is high.

Description

Technical Field

[0001] The invention belongs to the field of pipe airtightness testing devices, and in particular relates to an externally-embracing quick connector. Background Art

[0002] The airtightness test of complete electrical equipment and some parts is a part of the equipment reliability test. When performing high-pressure tests on some special pipes, the internal filling air pressure often reaches more than 500MPA. When conducting reliability tests, the failure of the sealing of the end face of the pipe at one end will cause great operational hazards to the testers and test equipment. Therefore, it is very difficult to seal the end face. Generally, destructive sealing is used, and then the damaged part is cut off. This not only causes waste of products, but also reduces the efficiency of the sealing test. Summary of the invention

[0003] In view of this, the present invention aims to provide an external-holding quick connector to solve the problems of high operating cost and low operating efficiency during high-voltage reliability testing of pipe fittings.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] An external-embracing quick connector comprises a first shell, a second shell, a piston and a claw. The upper end of the first shell is sealed and connected to the lower end of the second shell. A piston is arranged inside the second shell, and the outer periphery of the piston is slidably connected to the inner ring of the second shell. The inner ring of the piston is slidably connected to the outer periphery of a pipe fitting. A claw is installed at the lower end of the piston. The inner ring of the claw is contact-connected to the outer periphery of the pipe fitting. The pipe fitting is filled with compressed air. The compressed air is the displacement power of the piston and the second shell. The piston and the second shell are both displaced axially and move relative to each other. The outer periphery of the claw is slidably connected to the inner ring of the first shell. The second shell is provided with a detection hole. The inside of the pipe fitting is connected to the detection hole through the inside of the piston.

[0006] Furthermore, a slide is provided on the periphery of the clamping claw, and the periphery of the clamping claw is slidably connected to the inner ring of the lower end of the first shell through the slide.

[0007] Furthermore, a mounting groove is provided at the lower end of the second housing, the piston is located in the mounting groove, and the upper end of the piston is in contact with and connected to the top of the mounting groove.

[0008] Furthermore, a first ring platform is provided on the inner ring of the piston, and the inner ring of the piston is slidably connected to the outer periphery of the pipe fitting through the first ring platform.

[0009] Furthermore, a second ring platform is arranged on the periphery of the piston, and the periphery of the piston is slidably connected to the inner side wall of the mounting groove through the second ring platform.

[0010] Furthermore, a third ring platform is arranged in the installation groove, the third ring platform is arranged concentrically with the piston, and the outer periphery of the upper end of the piston is slidably connected to the inner ring of the third ring platform.

[0011] Furthermore, a first ring groove is provided on the periphery of the upper end of the piston, a protective ring and a first sealing ring are respectively installed in the first ring groove, and the periphery of the first sealing ring is contact-connected to one end of the protective ring.

[0012] Furthermore, a plurality of blocks are arranged at the first end of the second ring platform, and the plurality of blocks are arranged radially along the second ring platform, a spring is arranged outside each block, and each spring is located outside the third ring platform, and both ends of the spring are respectively fixedly connected to one end of the second ring platform and the top of the mounting groove.

[0013] Furthermore, the elasticity of the spring is the driving force for the second ring and the second housing to move axially and relative to each other.

[0014] Furthermore, a gap is provided between the second end of the second ring platform and the upper end of the first shell, and an air injection hole is provided on the second shell, and the air injection hole is communicated with the gap.

[0015] Compared with the prior art, the external quick connector of the present invention has the following beneficial effects:

[0016] (1) The external-embracing quick connector described in the present invention is designed to ensure the reliability of the pipe fitting in a high-pressure environment. The high-pressure medium inside the pipe fitting is connected to the inside of the piston. The high-pressure medium causes the piston and the second shell to move relative to each other in the axial direction. The piston drives the claw to move, and the second shell drives the first shell to move. Therefore, the claw and the first shell also move relative to each other. A slide is provided around the claw, and the outer side surface of the slide is provided with a slope. When the claw and the first shell move relative to each other, the rigidity of the inner diameter of the first shell remains unchanged, and the claw shrinks inward due to the slope of the slide, so that the inner circle of the claw grasps the outer periphery of the pipe fitting. At this time, the greater the medium pressure inside the pipe fitting, the firmer the connection between the claw and the pipe fitting, thereby achieving the sealing of the pipe fitting under high-pressure conditions, and the operation is simple and the reliability is high.

[0017] (2) In the external-embracing quick connector described in the present invention, the end surface of one end of the first ring platform and the top of the mounting groove are arranged parallel to each other, and compressed air acts on the end surface of one end of the first ring platform and the top of the mounting groove to ensure that the piston and the second housing are subjected to opposite forces.

[0018] (3) In the external-holding quick connector described in the present invention, a spring is arranged between the piston and the second housing, and the elasticity of the spring ensures that the connector has a certain gripping force when it is installed on the periphery of the end of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0020] Figure 1It is a cross-sectional view of the outer-holding quick connector according to an embodiment of the present invention;

[0021] Figure 2 A front view of the second housing according to the embodiment of the present invention;

[0022] Figure 3 is a cross-sectional view of the second housing according to an embodiment of the present invention;

[0023] Figure 4 is a cross-sectional view of a piston according to an embodiment of the present invention;

[0024] Figure 5 is a cross-sectional view of the claw according to an embodiment of the present invention;

[0025] Figure 6 It is a front view of the clamping claw described in the embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1-first housing; 2-circlip; 3-claw; 4-slide; 5-piston; 6-stopper; 7-spring; 8-protective ring; 9-first sealing ring; 10-second housing; 11-pipe fitting; 12-second sealing ring; 13-third sealing ring; 14-gasket; 15-fourth sealing ring; 16-gas injection hole; 17-detection hole; 18-installation groove; 19-first ring platform; 20-second ring platform; 21-third ring platform. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0032] like Figure 1-6 As shown, the outer-embracing quick connector comprises a first housing 1, a second housing 10, a piston 5 and a claw 3. The upper end of the first housing 1 is sealed and connected to the lower end of the second housing 10. The piston 5 is arranged inside the second housing 10, and the outer periphery of the piston 5 is slidably connected to the inner ring of the second housing 10. The inner ring of the piston 5 is slidably connected to the outer periphery of the pipe 11. The claw 3 is installed at the lower end of the piston 5. The inner ring of the claw 3 is contact-connected to the outer periphery of the pipe 11. The claw 3 is a connector claw 3 of the prior art, such as Figure 5-6 As shown, the clamping claw 3 includes a plurality of sub-grasps, and the plurality of sub-grasps are arranged in a circle. Positioning tension springs are arranged inside the plurality of sub-grasps arranged in the circle. The positioning tension springs are used to fix the relative position of each sub-grasp, and gaps are provided between each pair of sub-grasps. By reducing the gap distance, the inner diameter of the clamping claw 3 can be reduced.

[0033] Therefore, the pipe 11 is filled with compressed air, which is communicated to the inside of the piston 5 through the inside of the pipe 11. The lower end of the second housing 10 is provided with a mounting groove 18, and the piston 5 is located in the mounting groove 18, and the upper end of the piston 5 is in contact with the top of the mounting groove 18. The compressed air causes the piston 5 and the second housing 10 to move relative to each other in the axial direction, and the piston 5 drives the claw 3 to move, and the second housing 10 drives the first housing 1 to move, so the claw 3 and the first housing 1 also move relative to each other. A slide 4 is arranged on the periphery of each sub-claw. The outer side surface of the slide 4 is provided with a slope. When the claw 3 and the first shell 1 move relative to each other, the inner diameter rigidity of the first shell 1 remains unchanged, and the claw 3 shrinks inward due to the slope of the slide 4, the gap of the sub-grasp is reduced, and the inner diameter of the claw 3 becomes smaller, so that the inner circle of the claw 3 grasps the outer periphery of the pipe fitting 11. At this time, the greater the medium pressure inside the pipe fitting 11, the stronger the connection between the claw 3 and the pipe fitting 11, thereby achieving the sealing of the pipe fitting 11 under high-pressure conditions. In order to facilitate the claw 3 of the claw 3, the sub-grasp and the slide 4 are machined into an integrated structure.

[0034] The second housing 10 is provided with a detection hole 17 , and the interior of the pipe 11 is connected to the detection hole 17 through the interior of the piston 5 . The detection hole 17 is used to fix a pressure sensor for monitoring the actual air pressure and the pressure-maintaining state inside the pipe 11 .

[0035] A first ring platform 19 is provided on the inner ring of the piston 5, and the inner ring of the piston 5 is slidably connected to the outer periphery of the pipe fitting 11 through the first ring platform 19. At the same time, the first ring platform 19 is the pressure surface of the piston 5. The end surface of one end of the first ring platform 19 and the top of the mounting groove 18 are arranged parallel to each other. Compressed air acts on the end surface of one end of the first ring platform 19 and the top of the mounting groove 18 to ensure that the piston 5 and the second housing 10 are subjected to opposite forces.

[0036] In order to ensure that the connector has a certain gripping force when it is installed to the periphery of the end of the pipe fitting 11, an initial elastic force is set between one end of the piston 5 and the top of the mounting groove 18, so a second ring stage 20 is set on the periphery of the piston 5, and the periphery of the piston 5 is slidably connected to the inner side wall of the mounting groove 18 through the second ring stage 20, a plurality of blocks 6 are set at the first end of the second ring stage 20, and the plurality of blocks 6 are radially arranged along the second ring stage 20, a spring 7 is set on the periphery of each block 6, and each spring 7 is located outside the third ring stage 21, and the two ends of the spring 7 are respectively fixedly connected to one end of the second ring stage 20 and the top of the mounting groove 18, and the spring 7 is in a compressed state. The elasticity of the spring 7 causes the piston 5 and the second housing 10 to move relative to each other, so when installed to the periphery of the pipe fitting 11, even if there is no compressed air in the pipe fitting 11, the inner ring of the claw 3 can hold the periphery of the pipe fitting 11 tightly, and a retaining spring is clamped on the inner edge of the lower end of the second housing 10, and this part of the retaining spring is used to fix the relative position of the piston 5 to prevent the piston 5 from being ejected by the elasticity of the spring 7 when the claw 3 is removed.

[0037] In order to ensure the air tightness inside the piston 5, a third ring platform 21 is arranged in the installation groove 18. The third ring platform 21 is arranged concentrically with the piston 5. The outer periphery of the upper end of the piston 5 is slidably connected to the inner ring of the third ring platform 21. A first ring groove is arranged on the outer periphery of the upper end of the piston 5. A protective ring 8 and a first sealing ring 9 are respectively installed in the first ring groove. The outer periphery of the first sealing ring 9 is contact-connected to one end of the protective ring 8. A fracture is opened on the side wall of the protective ring 8. The protective ring 8 is used to protect the first sealing ring 9 from filling into the fitting gap between the outer periphery of the upper end of the piston 5 and the third ring platform 21 when under pressure.

[0038] In order to increase the air tightness of the connection points of each sub-component, a second sealing ring 12 is arranged between the outer periphery of the second ring platform 20 and the inner wall of the mounting groove 18, a third sealing ring 13 is arranged between the outer periphery of the lower end of the piston 5 and the inner ring of the upper end of the first shell 1, and a fourth sealing ring 15 and a gasket 14 are respectively arranged between the inner ring of the piston 5 and the outer periphery of the pipe fitting 11, and the fourth sealing ring 15 is located between the gasket 14 and the first ring platform 19.

[0039] Because the elasticity of the spring 7 causes the relative movement of the claw 3 and the first shell 1, the claw 3 is always in a state of holding the periphery of the pipe fitting 11, which makes assembly difficult in the initial stage of installation. An air injection hole 16 is opened on the second shell 10, and a gap is provided between the second end of the second ring platform 20 and the upper end of the first shell 1, and the air injection hole 16 is connected to the gap. In order to facilitate operation, two air injection holes 16 are provided, and the two air injection holes 16 are respectively installed with an air inlet valve and an air outlet valve, both of which are one-way valves. In order to increase the service life of the device and improve the fit, a retaining spring 2 is fixedly installed at the lower end of the first shell 1, and the inner ring of the retaining spring 2 is slidably connected to the periphery of the slide 4.

[0040] The use process of the external quick connector:

[0041] The staff connects the air inlet valve to the air pump and then closes the air outlet valve. The staff opens the air inlet valve, and the compressed air of the air pump enters the gap between the second end of the second ring platform 20 and the upper end of the first shell 1 through the air inlet valve and the air injection hole 16. The compressed air of the air pump offsets the elasticity of the spring 7. The second ring platform 20 drives the claw 3 to move toward the second shell 10 through the piston 5. The gap between the claws is reset under the influence of the tension spring, and the inner diameter of the claw 3 becomes larger. The enlarged inner diameter of the claw 3 makes it easier for the staff to install the pipe fitting 11. After the staff places the outer periphery of the end face of the pipe fitting 11 on the inner ring of the claw 3, the staff closes the air inlet valve and opens the air outlet valve. The pressure in the gap between the second end of the second ring platform 20 and the upper end of the first shell 1 is released, and the spring 7 elastically drives the piston 5 and the second shell 10 to move relative to each other. The piston 5 drives the claw 3 to move in the same direction, and the first shell 1 drives the second shell 10 to move in the same direction. The rigidity of the inner diameter of the first shell 1 remains unchanged, the claw 3 shrinks under the influence of the slope of the slide 4, the gap of the sub-grasping is reduced, the inner diameter of the claw 3 becomes smaller, so that the inner circle of the claw 3 grasps the periphery of the pipe fitting 11. When the air outlet valve is no longer deflated and the air outlet valve is always kept open, the staff injects pressure into the pipe fitting 11 from the other end face of the pipe fitting 11. The end face of the other end of the pipe fitting 11 can also be quickly connected with the connector. The compressed air causes the piston 5 and the second shell 10 to move relative to each other in the axial direction. The piston 5 drives the claw 3 to move, and the second shell 10 drives the first shell 1 to move. The rigidity of the inner diameter of the first shell 1 remains unchanged, the claw 3 shrinks under the influence of the slope of the slide 4, the gap of the sub-grasping is reduced, and the inner diameter of the claw 3 becomes smaller, so that the inner circle of the claw 3 grasps the periphery of the pipe fitting 11. At this time, the greater the medium pressure inside the pipe fitting 11, the firmer the connection between the claw 3 and the pipe fitting 11, thereby achieving the blocking of the pipe fitting 11 under high pressure conditions.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. External quick connector, characterized by: The invention comprises a second housing (10), a piston (5) and a claw (3), wherein the outer periphery of the piston (5) is slidably connected to the inner ring of the second housing (10), the inner ring of the piston (5) is slidably connected to the outer periphery of a pipe (11), the claw (3) is installed at the lower end of the piston (5), the inner ring of the claw (3) is contact-connected to the outer periphery of the pipe (11), the pipe (11) is filled with compressed air, the compressed air is the displacement power of the piston (5) and the second housing (10), the piston (5) and the second housing (10) are both displaced axially and move relative to each other, and the outer periphery of the claw (3) is slidably connected to the inner ring of the second housing (10); It also comprises a first housing (1), the upper end of the first housing (1) is sealingly connected to the lower end of the second housing (10), the outer periphery of the claw (3) is slidably connected to the inner ring of the first housing (1), the lower end of the second housing (10) is provided with a mounting groove (18), the piston (5) is located in the mounting groove (18), and the upper end of the piston (5) is contact-connected to the top of the mounting groove (18); A slide table (4) is arranged on the periphery of the clamping claw (3), and the periphery of the clamping claw (3) is slidably connected to the inner ring of the lower end of the first housing (1) through the slide table (4); A first ring platform (19) is provided on the inner ring of the piston (5), and the inner ring of the piston (5) is slidably connected to the outer periphery of the pipe member (11) through the first ring platform (19); A second ring platform (20) is arranged on the periphery of the piston (5), and the periphery of the piston (5) is slidably connected to the inner side wall of the mounting groove (18) through the second ring platform (20); A plurality of stoppers (6) are arranged at the first end of the second ring platform (20), and the plurality of stoppers (6) are arranged radially along the second ring platform (20), a spring (7) is arranged on the periphery of each stopper (6), and two ends of the spring (7) are respectively fixedly connected to one end of the second ring platform (20) and the top of the mounting groove (18); The elasticity of the spring (7) is the driving force for the second ring platform (20) and the second housing (10) to displace axially and move relative to each other.

2. The outer-holding quick connector according to claim 1 is characterized in that: A third ring platform (21) is arranged in the installation groove (18), the third ring platform (21) is arranged concentrically with the piston (5), and the outer periphery of the upper end of the piston (5) is slidably connected to the inner ring of the third ring platform (21).

3. The outer-holding quick connector according to claim 1 is characterized in that: A first ring groove is arranged on the periphery of the upper end of the piston (5), a protection ring (8) and a first sealing ring (9) are respectively installed in the first ring groove, and the periphery of the first sealing ring (9) is contact-connected to one end of the protection ring (8).

4. The outer-holding quick connector according to claim 1 is characterized in that: A gap is provided between the second end of the second ring platform (20) and the upper end of the first shell (1), and an air injection hole (16) is provided on the second shell (10), and the air injection hole (16) is connected to the gap.

Images