Self-tightening anti-loosening pipe pressure resistance test clamp

Abstract

The utility model relates to the technical field of pipe pressure resistance testing, in particular to a self-tightening anti-loosening pipe pressure resistance testing clamp which comprises a shell, a pressure applying ring and an anti-loosening block, the shell is provided with a connector used for being connected with the end of a pipe in a sealed mode, the pressure applying ring is detachably connected to the connector, and the anti-loosening block is arranged on the shell. The multiple anti-loosening blocks are distributed on the inner side of the pressure applying ring in the circumferential direction, the sides, away from the pressure applying ring, of the anti-loosening blocks are used for abutting against the outer side wall of a pipe, the inner side face of the pressure applying ring is a first conical face, and each anti-loosening block is provided with a second conical face abutting against the first conical face in a matched mode. And the curvature radiuses of the radial sections of the first conical surface and the second conical surface are gradually reduced from the direction close to the shell to the direction far away from the shell. The anti-loosening block can limit the shell and the pressure applying ring from being separated from the pipe in the axial direction, the shell and the pressure applying ring can tightly press the anti-loosening block in the radial direction, sliding between the anti-loosening block and the outer side wall of the pipe is avoided, and the self-tightening anti-loosening effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of pipe pressure resistance testing technology, and more specifically, to a self-tightening anti-loosening pipe pressure resistance testing fixture. Background Technology

[0002] Pipe pressure resistance testing is a method that tests the pressure resistance and sealing performance of pipes by applying pressure to their interior. Specifically, the pressure is gradually increased during the test until a predetermined pressure value is reached, and then the pipe's response is observed to determine whether it can withstand normal operating pressure without leakage or deformation.

[0003] In pipe pressure testing, the pipe ends need to be sealed, typically using pressure testing fixtures. The stability of this fixture connection plays a crucial role in the test. Common pressure testing fixtures employ complex connection structures to achieve good sealing, leading to complicated assembly and low testing efficiency. If simple bolt fixing is used, there is a risk of the fixture loosening from the pipe during the pressure test, causing test failure. Therefore, it is necessary to design new pipe pressure testing fixtures. Utility Model Content

[0004] To overcome the problem of loosening of pipe pressure test fixtures in the prior art, this utility model provides a self-tightening and anti-loosening pipe pressure test fixture, which can achieve the effect of self-tightening and anti-loosening, and facilitates connection to improve testing efficiency.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a self-tightening anti-loosening pipe pressure resistance test fixture, comprising: a housing, a pressure ring, and anti-loosening blocks. The housing has an interface for sealing connection with the end of the pipe. The pressure ring is detachably connected to the interface. A plurality of anti-loosening blocks are distributed circumferentially on the inner side of the pressure ring. The side of the anti-loosening block away from the pressure ring is used to abut against the outer wall of the pipe. The inner side of the pressure ring is a first conical surface. The anti-loosening block has a second conical surface that matches and abuts against the first conical surface. The radial cross-sectional radii of curvature of the first conical surface and the second conical surface gradually decrease from the direction close to the housing to the direction away from the housing.

[0006] In this invention, a self-tightening anti-loosening pipe pressure test fixture is sealed to the end of the pipe to be tested, facilitating pressure testing. When pressure is applied to the pipe, the housing tends to detach from the pipe under pressure. This tendency is transmitted to the anti-loosening block via the pressure ring. The first conical surface of the pressure ring abuts against the second conical surface of the anti-loosening block, increasing radial pressure and pressing the anti-loosening block firmly against the outer wall of the pipe. During testing, the anti-loosening block axially prevents the housing and pressure ring from detaching from the pipe, and radially presses the anti-loosening block, preventing slippage between the anti-loosening block and the outer wall of the pipe, thus achieving a self-tightening and anti-loosening effect.

[0007] Furthermore, the anti-loosening block has a serrated structure on one side of the pipe material.

[0008] In this solution, the anti-loosening block is engaged with the outer wall of the pipe through a serrated structure, which improves the stability of the clamping between the anti-loosening block and the pipe and reduces the relative movement between the anti-loosening block and the pipe.

[0009] Furthermore, the angle between the first and second conical surfaces and the transverse section is 2° to 5°.

[0010] In this design, a suitable cone angle is set to facilitate the contact and tightening between the anti-loosening block and the pressure ring.

[0011] Furthermore, the housing and the pressure ring are connected by bolts, the outer edge of the interface is provided with a threaded hole, the pressure ring is provided with a through hole corresponding to the threaded hole, and the bolt passes through the through hole and the threaded hole for connection.

[0012] In this design, the housing and the pressure ring are connected by bolts, which facilitates the connection and installation of the clamp and the pipe. Tightening the bolts can make the anti-loosening block press the pipe tightly.

[0013] Furthermore, a plurality of bolts are evenly distributed circumferentially between the housing and the pressure ring, and each bolt and each anti-loosening block are alternately distributed circumferentially.

[0014] In this solution, bolts and anti-loosening blocks with uniform spacing are used to improve the overall force balance of the fixture.

[0015] Furthermore, the interface is connected with a plurality of limiting blocks along the circumferential direction. One end of the limiting block is fixedly connected to the housing along the axial direction, and the other end of the limiting block is inserted into the anti-loosening block along the axial direction.

[0016] In this solution, the limiting block is used to position the anti-loosening block in the circumferential direction.

[0017] Furthermore, the outer edge of the interface is provided with a trapezoidal groove that runs radially through it, and the limiting block has a trapezoidal portion that is slidably connected to the trapezoidal groove in the radial direction. The cross-sectional area of ​​the trapezoidal groove and the trapezoidal portion gradually decreases from the housing toward the pressure ring.

[0018] In this design, the trapezoidal groove runs radially through the space to facilitate the assembly of the trapezoidal part, and the trapezoidal part and the trapezoidal groove cooperate to fix the housing and the limiting block in the axial direction.

[0019] Furthermore, the anti-loosening block has a positioning post on the side facing the limiting block, and the limiting block has a positioning hole on the side facing the anti-loosening block. The positioning post and the positioning hole are inserted into each other axially.

[0020] In this design, the anti-loosening block and the limiting block can move axially through the cooperation of the positioning pin and the positioning hole.

[0021] Furthermore, an annular groove is provided inside the housing, and a sealing ring is provided inside the annular groove.

[0022] In this solution, a sealing ring is used to improve the sealing performance of the connection between the clamp and the pipe.

[0023] Furthermore, the housing has a pressurization port for connecting an external pressurization device.

[0024] In this solution, connecting an external pressurization device via a pressurization port facilitates pressure testing of the pipe's interior.

[0025] Furthermore, each of the anti-loosening blocks is evenly distributed circumferentially.

[0026] In this solution, the fixing effect on the pipe is improved by using anti-loosening blocks that are evenly distributed around the circumference.

[0027] Compared with the prior art, the beneficial effects of this utility model are:

[0028] This utility model discloses a self-tightening anti-loosening pipe pressure test fixture. When pressure is applied to the pipe, the housing tends to detach from the pipe under pressure. This tendency is transmitted to the anti-loosening block through the pressure ring, and the first conical surface abuts against the second conical surface to increase radial pressure on the anti-loosening block, pressing it firmly against the outer wall of the pipe. The anti-loosening block does not slide axially against the outer wall of the pipe. At this time, the housing and pressure ring are restrained by the anti-loosening block and will not separate from the pipe. Simultaneously, the internal pressure of the pipe further tightens the anti-loosening block, achieving a self-tightening and anti-loosening effect. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the self-tightening and anti-loosening pipe pressure resistance test fixture of this utility model;

[0030] Figure 2 This is a schematic diagram of the shell structure;

[0031] Figure 3 This is a schematic diagram of the pressure ring structure;

[0032] Figure 4 This is a schematic diagram of the anti-loosening block;

[0033] Figure 5 This is a schematic diagram of the limit block structure;

[0034] Figure 6 This is a schematic diagram of the connection between the clamp and the pipe.

[0035] In the attached diagram: 1. Housing; 11. Interface; 12. Trapezoidal groove; 13. Annular groove; 14. Pressurization port; 15. Threaded hole; 2. Pressure ring; 21. First conical surface; 22. Through hole; 3. Anti-loosening block; 31. Second conical surface; 32. Serrated structure; 33. Positioning post; 4. Bolt; 5. Limiting block; 51. Trapezoidal part; 52. Positioning hole; 6. Sealing ring. Detailed Implementation

[0036] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0037] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0038] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0039] Example 1

[0040] refer to Figures 1 to 6This embodiment discloses a self-tightening anti-loosening pipe pressure resistance test fixture, including a housing 1, a pressure ring 2, and anti-loosening blocks 3. The housing 1 has an interface 11 for sealing connection with the end of the pipe. The pressure ring 2 is detachably connected to the interface 11. Multiple anti-loosening blocks 3 are distributed circumferentially on the inner side of the pressure ring 2. The side of the anti-loosening block 3 away from the pressure ring 2 is used to abut against the outer wall of the pipe. The inner side of the pressure ring 2 is a first conical surface 21. The anti-loosening block 3 has a second conical surface 31 that matches and abuts against the first conical surface 21. The radial cross-sectional radii of curvature of the first conical surface 21 and the second conical surface 31 gradually decrease from the direction close to the housing 1 to the direction away from the housing 1.

[0041] In this embodiment, the self-tightening anti-loosening pipe pressure test fixture is sealed to the end of the pipe to be tested to facilitate pressure testing. When pressure is applied to the pipe, the housing 1 tends to detach from the pipe under pressure. This tendency of the housing 1 to detach is transmitted to the anti-loosening block 3 through the pressure ring 2. The first conical surface 21 of the pressure ring 2 abuts against the second conical surface 31 of the anti-loosening block 3, thereby increasing the radial pressure on the anti-loosening block 3 and pressing it tightly against the outer wall of the pipe. During testing, the anti-loosening block 3 can axially restrict the housing 1 and the pressure ring 2 from detaching from the pipe, and the housing 1 and the pressure ring 2 can radially press the anti-loosening block 3, preventing slippage between the anti-loosening block 3 and the outer wall of the pipe, thus achieving a self-tightening and anti-loosening effect.

[0042] In some embodiments, the side of the anti-loosening block 3 that contacts the pipe can be designed as a rough surface to increase the friction of the contact and reduce relative sliding. Each anti-loosening block 3 is evenly distributed circumferentially, and the number of anti-loosening blocks 3 can be selected according to actual needs. For example, in this embodiment, six anti-loosening blocks 3 are evenly distributed circumferentially on the inner side of the pressure ring 2.

[0043] In practical applications, the appropriate test fixtures are used for connection based on the number of pipe ends. For example, if both ends of the pipe are open, two test fixtures are used to seal and connect the two ends of the pipe respectively.

[0044] refer to Figure 1 and Figure 4 The anti-loosening block 3 has a serrated structure 32 on one side that abuts against the pipe. The serrated structure 32 engages the anti-loosening block 3 with the outer wall of the pipe, improving the stability of the clamping between the anti-loosening block 3 and the pipe, and reducing relative movement between them. The side of the anti-loosening block 3 that abuts against the pipe can be an arc surface that matches the outer wall of the pipe, further improving the fit between the anti-loosening block 3 and the pipe and reducing relative slippage.

[0045] In this embodiment, the angle between the first conical surface 21 and the second conical surface 31 and the axial section can be selected to be 2° to 5°, which has a good clamping and anti-loosening effect while facilitating assembly.

[0046] refer to Figure 1 The housing 1 and the pressure ring 2 are connected by bolts 4. The outer edge of the interface 11 is provided with a threaded hole 15. The pressure ring 2 is provided with a through hole 22 corresponding to the threaded hole 15. The bolts 4 pass through the through hole 22 and the threaded hole 15 to connect.

[0047] In this embodiment, the housing 1 and the pressure ring 2 are connected by bolts 4, which facilitates the connection and installation of the clamp and the pipe. During connection, tightening the bolts 4 can pre-tighten the anti-loosening block 3.

[0048] refer to Figure 1 Each anti-loosening block 3 is evenly distributed circumferentially. In this embodiment, the evenly distributed anti-loosening blocks 3 can make the force on the side wall of the pipe more balanced, thus improving the fixing effect of the pipe.

[0049] refer to Figure 1 Multiple bolts 4 are evenly distributed circumferentially between the housing 1 and the pressure ring 2, and each bolt 4 and each anti-loosening block 3 are alternately distributed circumferentially. In this embodiment, the use of evenly spaced bolts 4 and anti-loosening blocks 3 improves the overall force balance of the fixture.

[0050] refer to Figure 6 The housing 1 has a pressure port 14 for connecting an external pressure device. In this embodiment, connecting the external pressure device through the pressure port 14 facilitates pressure testing of the inside of the pipe. The pressure port 14 can be located at the end of the housing 1 furthest from the connection with the pipe. Liquid can be injected into the pipe through the pressure port 14 for pressurization, and the external pressure device can be a liquid injection pump.

[0051] Example 2

[0052] refer to Figure 1 This embodiment is similar to embodiment 1, except that in this embodiment, the interface 11 is connected with a plurality of limiting blocks 5 along the circumferential direction, one end of the limiting block 5 is fixedly connected to the housing 1 along the axial direction, and the other end of the limiting block 5 is inserted into the anti-loosening block 3 along the axial direction.

[0053] In this embodiment, the limiting block 5 can not only position the anti-loosening block 3 in the circumferential direction, but also does not affect the axial mobility between the anti-loosening block 3 and the housing 1, and does not affect the self-tightening and anti-loosening effect.

[0054] refer to Figure 2 and Figure 5 The outer edge of the interface 11 is provided with a trapezoidal groove 12 that runs radially through it. The limiting block 5 has a trapezoidal part 51, which is slidably connected to the trapezoidal groove 12 in the radial direction. The cross-sectional area of ​​the trapezoidal groove 12 and the trapezoidal part 51 gradually decreases from the housing 1 toward the pressure ring 2.

[0055] In this embodiment, the trapezoidal groove 12 extends radially to facilitate the assembly of the trapezoidal portion 51, allowing the trapezoidal portion 51 of the limiting block 5 to be inserted radially into the trapezoidal groove 12. Simultaneously, since the cross-sectional area of ​​the trapezoidal groove 12 and the trapezoidal portion 51 gradually decreases from the housing 1 towards the pressure ring 2, the trapezoidal portion 51 will not slide out of the trapezoidal groove 12 axially, thus fixing the housing 1 and the limiting block 5 axially.

[0056] refer to Figure 4 and Figure 5 The anti-loosening block 3 has a positioning post 33 on the side facing the limiting block 5, and the limiting block 5 has a positioning hole 52 on the side facing the anti-loosening block 3. The positioning post 33 and the positioning hole 52 are inserted into each other axially. In this embodiment, the anti-loosening block 3 and the limiting block 5 can move axially through the cooperation of the positioning post 33 and the positioning hole 52. The positioning post 33 can be a square cross-section, and the positioning hole 52 can be a square hole that matches the positioning groove. By setting the square positioning post 33 and the positioning hole 52, rotation between the anti-loosening block 3 and the limiting block 5 can be avoided, thus improving the positioning effect. In some other embodiments, the positions of the positioning post 33 and the positioning hole 52 can also be interchanged.

[0057] Example 3

[0058] refer to Figure 1 and Figure 2 This embodiment is similar to Embodiment 1, except that an annular groove 13 is provided inside the housing 1, and a sealing ring 6 is disposed within the annular groove 13. In this embodiment, the sealing ring 6 improves the sealing performance of the connection between the clamp and the pipe. The axial cross-section of the sealing groove can be an inverted trapezoid, that is, the size of the sealing groove gradually decreases towards the axis, which reduces the possibility of the sealing ring 6 falling off the annular groove 13 and improves the stability of the sealing ring 6 connection.

[0059] The self-tightening anti-loosening pipe pressure test fixture in at least one embodiment of this utility model is used as follows: First, wipe the surface of the pipe to be tested clean. Place the sealing ring 6 in the annular groove 13 of the housing 1, and then gradually insert the pipe into the housing 1, so that the sealing ring 6 is sealed and fitted to the outer wall surface of the pipe. After the pipe is inserted, tighten the bolt 4 with a tool to bring the pressure ring 2 and the housing 1 closer together, making the connection easier. At this time, the first conical surface 21 of the pressure ring 2 presses inward against the second conical surface 31 of the anti-loosening block 3, so that the anti-loosening block 3 presses the pipe tightly, and the serrated structure 32 engages with the outer wall surface of the pipe, which can be partially embedded in the outer wall material of the pipe.

[0060] The external pressurization device is activated to increase the pressure inside the pipe. As the pressure gradually increases, there is a tendency for the housing 1 to separate from the pipe. At this time, the anti-loosening block 3 engages and abuts against the outer wall of the pipe. The anti-loosening block 3 can axially restrict the housing 1 and the pressure ring 2 from separating from the pipe, and the housing 1 and the pressure ring 2 can radially press the anti-loosening block 3 to prevent sliding between the anti-loosening block 3 and the outer wall of the pipe, thus achieving a self-tightening and anti-loosening effect.

[0061] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A self-tightening, anti-loosening pipe pressure resistance test fixture, characterized in that: The device includes a housing (1), a pressure ring (2), and anti-loosening blocks (3). The housing (1) has an interface (11) for sealing connection with the end of the pipe. The pressure ring (2) is detachably connected to the interface (11). A plurality of anti-loosening blocks (3) are distributed circumferentially on the inner side of the pressure ring (2). The side of the anti-loosening block (3) away from the pressure ring (2) is used to abut against the outer wall of the pipe. The inner side of the pressure ring (2) is a first conical surface (21). The anti-loosening block (3) has a second conical surface (31) that matches and abuts against the first conical surface (21). The radial cross-sectional radii of curvature of the first conical surface (21) and the second conical surface (31) gradually decrease from the direction close to the housing (1) to the direction away from the housing (1).

2. The self-tightening anti-loosening pipe pressure test fixture according to claim 1, characterized in that: The anti-loosening block (3) is provided with a serrated structure (32) on one side of the pipe material.

3. The self-tightening anti-loosening pipe pressure test fixture according to claim 1, characterized in that: The angle between the first conical surface (21) and the second conical surface (31) and the axial section is 2° to 5°.

4. The self-tightening anti-loosening pipe pressure test fixture according to claim 1, characterized in that: The housing (1) and the pressure ring (2) are connected by bolts (4). The outer edge of the interface (11) is provided with a threaded hole (15). The pressure ring (2) is provided with a through hole (22) corresponding to the threaded hole (15). The bolt (4) passes through the through hole (22) and the threaded hole (15) for connection.

5. The self-tightening anti-loosening pipe pressure test fixture according to claim 4, characterized in that: Multiple bolts (4) are evenly distributed circumferentially between the housing (1) and the pressure ring (2), and each bolt (4) and each anti-loosening block (3) are alternately distributed circumferentially.

6. The self-tightening anti-loosening pipe pressure test fixture according to claim 1, characterized in that: The interface (11) is connected with a plurality of limiting blocks (5) along the circumferential direction. One end of the limiting block (5) is fixedly connected to the housing (1) along the axial direction, and the other end of the limiting block (5) is inserted into the anti-loosening block (3) along the axial direction.

7. The self-tightening anti-loosening pipe pressure test fixture according to claim 6, characterized in that: The outer edge of the interface (11) is provided with a trapezoidal groove (12) that runs radially through it. The limiting block (5) has a trapezoidal part (51) which is slidably connected to the trapezoidal groove (12) in the radial direction. The cross-sectional area of ​​the trapezoidal groove (12) and the trapezoidal part (51) gradually decreases from the housing (1) toward the pressure ring (2).

8. The self-tightening anti-loosening pipe pressure test fixture according to claim 7, characterized in that: The anti-loosening block (3) has a positioning post (33) on the side facing the limiting block (5), and the limiting block (5) has a positioning hole (52) on the side facing the anti-loosening block (3). The positioning post (33) and the positioning hole (52) are inserted into each other along the axial direction.

9. The self-tightening anti-loosening pipe pressure test fixture according to claim 1, characterized in that: The housing (1) has an annular groove (13) inside, and a sealing ring (6) is provided inside the annular groove (13).

10. The self-tightening anti-loosening pipe pressure test fixture according to claim 1, characterized in that: The housing (1) has a pressurization port (14) for connecting an external pressurization device.

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