High-pressure internal expansion type quick plug

Abstract

The utility model discloses a high-pressure internal expansion type quick plug in the technical field of quick plugs, which comprises a pull rod and an internal expansion sealing ring, a compression flange is arranged at the end of the pull rod, a connecting end is integrally arranged at the other end of the pull rod, a main body of the pull rod is inserted and mounted in a cavity of an internal expansion sleeve, and the internal expansion sealing ring is arranged in the cavity of the internal expansion sleeve. A cavity of the inner expansion sleeve is of a smooth through hole structure, the inner expansion sealing ring is installed on the outer side of the pull rod and located between the end face of the pressing flange and the end face of the inner expansion sleeve, and a locking nut, a threaded sleeve and a threaded cover are arranged on the outer side of the end, away from the inner expansion sealing ring, of the inner expansion sleeve. And a rectangular hole structure is formed in the middle position of the screw cap. The pressing flange is arranged at the end of the pull rod and replaces a pressing block and a steel wire baffle ring structure, the stability of an extrusion structure of the internal expansion sealing ring can be effectively improved, meanwhile, the overall structure and the machining technology of the pull rod are simplified, and cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of quick plugs, and specifically relates to a high-pressure internal expansion type quick plug. Background Art

[0002] The internal expansion type quick plug is a connector used for sealing various internal holes and pipe holes. Its main feature is that it can adapt to a relatively large inner diameter tolerance of the pipe and can achieve quick sealing under high-pressure environments. The internal expansion type quick plugs are widely used in the refrigeration and new energy industries, such as heat exchangers, pressure vessels, instruments, meters, and cooling plates of motor controllers. They achieve sealing through internal expansion, and can form an effective sealing effect on both machined surfaces and some cast surfaces. Application No.: CN201620137268.4 discloses an internal expansion type plugging head. By setting a wrench to pull the internal expansion main rod, the sealing ring is squeezed, causing the sealing ring to deform and tightly adhere to the hole wall, thereby sealing the hole. Although this plug has a certain use effect, the compression of the sealing ring mainly relies on the extrusion of the pressing block, and the pressing block is installed on the internal expansion main rod through a wire retaining ring. The internal expansion main rod needs to be provided with a mounting groove structure adapted to the wire retaining ring. The extrusion stability of the combined pressing block is greatly affected by the wire retaining ring, and the structure of the internal expansion main rod is relatively complex, with a relatively high processing cost. At the same time, the adjusting nut has an extended part extending to the internal expansion main rod in a ring-shaped structure, and there is no radial limit between the internal expansion main rod and the adjusting nut and the housing, resulting in the situation that the internal expansion main rod rotates relative to the housing, affecting the use effect of the plug.

[0003] In view of this, the present utility model is specifically proposed. Content of the Utility Model

[0004] The technical problem to be solved by the present utility model is to overcome the deficiencies of the prior art and provide a high-pressure internal expansion type quick plug. To solve the above technical problems, the basic concept of the technical solution adopted by the present utility model is as follows:

[0005] A high-pressure internal expansion type quick plug includes a pull rod and an internal expansion sealing ring. A pressing flange is provided at the end of the pull rod. The other end of the pull rod is integrally provided with a connecting end. The main body of the pull rod is inserted and installed in the cavity of the internal expansion sleeve. The cavity of the internal expansion sleeve is a smooth through-hole structure. The internal expansion sealing ring is installed outside the pull rod, between the end face of the pressing flange and the end face of the internal expansion sleeve. A locking nut, a sleeve, and a screw cap are provided outside one end of the internal expansion sleeve away from the internal expansion sealing ring. A rectangular hole structure is provided at the middle position of the screw cap. The connecting end of the pull rod is rotationally connected to the hand-held part. A rotational connection seat is provided at the mating end of the hand-held part and the pull rod. The rotational connection seat is a transition structure between a straight face and an arc face, and the distance from the straight face to the rotation center is greater than the distance from the arc face to the rotation center.

[0006] As a further solution of the present utility model: an installation slot is provided inside the rotating connection seat, the connection end of the pull rod is arranged in the installation slot of the rotating connection seat, pin holes are correspondingly arranged on both the rotating connection seat and the connection end, and a pin shaft is installed in the pin holes to realize the rotational connection between the hand-held part and the pull rod.

[0007] As a further solution of the present utility model: the outer diameter of the lock nut and the inner expansion sleeve is connected by a thread, the outer diameter of the screw sleeve and the inner expansion sleeve is connected by a thread, and the inner diameter of the screw cap and the screw sleeve is connected by a thread. The arrangement of the screw cap and the screw sleeve can lengthen the inner expansion sleeve, so as to adapt to inner expansion sealing rings of different width specifications.

[0008] As a further solution of the present utility model: a groove is arranged between the threaded section and the end face of the screw cap to ensure an effective threaded connection between the screw cap and the screw sleeve.

[0009] As a further solution of the present utility model: the pressing flange end of the pull rod, the inner expansion sealing ring and the end of the inner expansion sleeve are all inserted and installed in the hole of the plugged tooling. A limiting boss is arranged on the outer side of the inner expansion sleeve, and the diameter dimension of the limiting boss is larger than the diameter dimension of the hole position of the plugged tooling, so as to limit the installation of the plug and facilitate visually checking whether the plug is installed in place.

[0010] After adopting the above technical solutions, the present utility model has the following beneficial effects compared with the prior art.

[0011] A pressing flange is arranged at the end position of the pull rod of the present utility model, replacing the structures of the pressing block and the wire retaining ring, which can effectively improve the stability of the extrusion structure of the inner expansion sealing ring. At the same time, the overall structure and processing technology of the pull rod are simplified, and the cost is reduced.

[0012] A screw cap, a screw sleeve and a lock nut are arranged at the matching end of the pull rod and the hand-held part of the present utility model. A rectangular hole structure is arranged in the middle position of the screw cap and is adapted to the connection end of the hand-held part, which can effectively limit the rotation of the pull rod relative to the inner expansion sleeve, avoid the rotation of the pull rod, and ensure the use effect of the plug.

[0013] The following further describes in detail the specific implementation manners of the present utility model with reference to the drawings. Description of the Drawings

[0014] The accompanying drawings, as part of this application, are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model, but do not constitute an improper limitation to the present utility model. Obviously, the accompanying drawings in the following description are only some embodiments. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. In the drawings:

[0015] Figure 1 is a schematic structural diagram of the present utility model;

[0016] Figure 2 is a schematic structural diagram of the cooperation state of the present utility model with the blocked tooling;

[0017] Figure 3 is a main sectional view of the cooperation state of the present utility model with the blocked tooling;

[0018] Figure 4 is a side sectional view of the cooperation state of the present utility model with the blocked tooling;

[0019] Figure 5 is a schematic structural diagram of the pull rod of the present utility model;

[0020] Figure 6 is the front view of the screw cap of the present utility model;

[0021] Figure 7 is a schematic structural diagram of the screw cap of the present utility model;

[0022] Figure 8 is a schematic structural diagram of the hand-held part of the present utility model;

[0023] Figure 9 is the front view of the hand-held part of the present utility model.

[0024] In the figure: 1. Pull rod; 2. Inner expansion sealing ring; 3. Inner expansion sleeve; 4. Locking nut; 5. Screw sleeve; 6. Screw cap; 7. Hand-held part; 8. Pin shaft; 9. Blocked tooling; 10. Rectangular hole structure; 11. Rotating connection seat; 12. Connection end; 13. Pressing flange; 14. Limiting boss.

[0025] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the present utility model in any way, but to illustrate the concept of the present utility model to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0027] As shown Figures 1 to 9 in the figure, a high-pressure internal expansion type quick plug includes a pull rod 1 and an internal expansion sealing ring 2. A pressing flange 13 is provided at the end of the pull rod 1. The other end of the pull rod 1 is integrally provided with a connecting end 12. The main body of the pull rod 1 is inserted and installed in the cavity of the internal expansion sleeve 3. The cavity of the internal expansion sleeve 3 is a smooth through-hole structure. The internal expansion sealing ring 2 is installed outside the pull rod 1, between the end face of the pressing flange 13 and the end face of the internal expansion sleeve 3. A locking nut 4, a screw sleeve 5 and a screw cap 6 are provided on the outer side of the end of the internal expansion sleeve 3 away from the internal expansion sealing ring 2. A rectangular hole structure 10 is provided at the middle position of the screw cap 6. The connecting end 12 of the pull rod 1 is rotatably connected to a hand-held part 7. A rotating connection seat 11 is provided at the mating end of the hand-held part 7 and the pull rod 1. The rotating connection seat 11 is a transition structure between a straight face and an arc face, and the distance from the straight face to the rotation center is greater than the distance from the arc face to the rotation center.

[0028] Wherein, an installation slot is provided in the rotating connection seat 11. The connecting end 12 of the pull rod 1 is arranged in the installation slot of the rotating connection seat 11. Corresponding pin holes are provided on both the rotating connection seat 11 and the connecting end 12, and a pin shaft 8 is installed in the pin holes to realize the rotational connection between the hand-held part 7 and the pull rod 1.

[0029] The locking nut 4 is threadedly connected to the outer diameter of the internal expansion sleeve 3. The screw sleeve 5 is threadedly connected to the outer diameter of the internal expansion sleeve 3. The screw cap 6 is threadedly connected to the inner diameter of the screw sleeve 5. The settings of the screw cap 6 and the screw sleeve 5 can lengthen the internal expansion sleeve 3, so as to adapt to internal expansion sealing rings 2 of different width specifications.

[0030] A groove is provided between the threaded section and the end face of the screw cap 6 to ensure effective threaded connection between the screw cap 6 and the screw sleeve 5.

[0031] The pressing flange 13 end of the pull rod 1, the internal expansion sealing ring 2 and the end of the internal expansion sleeve 3 are all inserted and installed in the hole of the workpiece to be plugged 9. A limiting boss 14 is provided on the outer side of the internal expansion sleeve 3. The diameter size of the limiting boss 14 is greater than the diameter size of the hole position of the workpiece to be plugged 9, and is used for limiting the installation of the plug, so as to visually check whether the plug is installed in place.

[0032] The working principle of the present utility model is as follows: When using this quick plug, insert the end of the pull rod 1 of the quick plug, which is installed with the inner expansion sealing ring 2, into the mating hole of the workpiece 9 to be plugged. Rotate the handle so that the handle rotates 90 degrees clockwise downward with the pin as the center. Since there is a transition structure between the straight surface and the arc surface at the lower end of the handle, a displacement difference will be generated during the 90-degree rotation of the handle. After rotation, the straight surface at the end of the handle fits with the screw cap 6. The handle squeezes the screw cap 6, while the screw cap 6, the screw sleeve 5, the inner expansion sleeve 3, and the lock nut 4 are fixed relative to the workpiece 9 to be plugged. This causes the pull rod 1 to move upward under the drive of the pin shaft 8, resulting in the front part of the pull rod 1 squeezing the inner expansion sealing ring 2. The inner expansion sealing ring 2 is squeezed and deformed, further tightly adhering to the inner wall of the workpiece 9 to be plugged, thereby achieving the effect of sealing the workpiece 9 to be plugged;

[0033] When the quick plug is pulled out from the workpiece 9 to be plugged, similarly, the handle rotates 90 degrees counterclockwise upward with the pin as the center. The vertical direction of the handle is the same as the vertical direction of the pull rod 1, and the pull rod 1 resets. The inner expansion sealing ring 2 is not squeezed by the pull rod 1, and the inner expansion sealing ring 2 expands normally and disengages from the inner wall of the workpiece 9 to be plugged. In this way, the quick plug can be easily pulled out;

[0034] A pressing flange 13 is provided at the end position of the pull rod 1 of the present utility model, replacing the pressing block and the wire retaining ring structure, which can effectively improve the stability of the extrusion structure for the inner expansion sealing ring 2. At the same time, it simplifies the overall structure and processing technology of the pull rod 1, reduces costs. A screw cap 6, a screw sleeve 5, and a lock nut 4 are provided at the mating end of the pull rod 1 and the hand-held part 7. A rectangular hole structure 10 is provided at the middle position of the screw cap 6, which is adapted to the connecting end 12 of the hand-held part 7, which can effectively limit the rotation of the pull rod 1 relative to the inner expansion sleeve 3, prevent the pull rod 1 from rotating, and ensure the use effect of the plug;

[0035] This application has a simple, practical structure and low maintenance cost. It is made of aluminum alloy material, which is light and flexible to use.

[0036] The above are only the preferred embodiments of the present utility model, and do not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present utility model, can make some changes or modifications to the above-mentioned technical content using the disclosed technical content as equivalent changeable equivalent embodiments. However, as long as it does not depart from the content of the technical solution of the present utility model, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A high-pressure internal expansion type quick plug, comprising a pull rod (1), a handle (7) and an internal expansion sealing ring (2), characterized in that, A pressing flange (13) is provided at the end position of the pull rod (1). The other end of the pull rod (1) is integrally provided with a connecting end (12). The main body of the pull rod (1) is inserted and installed in the cavity of the inner expansion sleeve (3). The cavity of the inner expansion sleeve (3) is a smooth through-hole structure. The inner expansion sealing ring (2) is installed outside the pull rod (1), between the end face of the pressing flange (13) and the end face of the inner expansion sleeve (3). A locking nut (4), a screw sleeve (5) and a screw cap (6) are provided on the outer side of the end of the inner expansion sleeve (3) away from the inner expansion sealing ring (2). A rectangular hole structure (10) is provided at the middle position of the screw cap (6). The connecting end (12) of the pull rod (1) is rotatably connected to the hand-held part (7). A rotating connection seat (11) is provided at the mating end of the hand-held part (7) and the pull rod (1). The rotating connection seat (11) is a transition structure between a straight surface and an arc surface, and the distance from the straight surface to the rotation center is greater than the distance from the arc surface to the rotation center.

2. The high-pressure internal expansion type quick plug according to claim 1, wherein An installation slot is provided in the rotating connection seat (11). The connecting end (12) of the pull rod (1) is arranged in the installation slot of the rotating connection seat (11). Corresponding pin holes are provided on both the rotating connection seat (11) and the connecting end (12), and a pin shaft (8) is installed in the pin holes.

3. The high-pressure internal expansion type quick plug according to claim 2, characterized in that, The locking nut (4) is threadedly connected to the outer diameter of the inner expansion sleeve (3). The screw sleeve (5) is threadedly connected to the outer diameter of the inner expansion sleeve (3). The screw cap (6) is threadedly connected to the inner diameter of the screw sleeve (5). The screw cap (6) and the screw sleeve (5) are provided.

4. The high-pressure internal expansion type quick plug according to claim 3, characterized in that, A groove is provided between the threaded section and the end face of the screw cap (6).

5. The high-pressure internal expansion type quick plug according to claim 4, characterized in that The pressing flange (13) end of the pull rod (1), the inner expansion sealing ring (2) and the end of the inner expansion sleeve (3) are all inserted and installed in the hole of the plugged tooling (9). A limiting boss (14) is provided on the outer side of the inner expansion sleeve (3). The diameter dimension of the limiting boss (14) is greater than the diameter dimension of the hole position of the plugged tooling (9).

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