Connection device for strength testing of bare pipes

Abstract

This utility model relates to a connection device for strength testing of bare pipes, comprising a guide sleeve, an expansion sleeve, a compression sleeve, and an outer nut; the guide sleeve is cylindrical; each end of the guide sleeve has a receiving groove on its inner wall; the expansion sleeve is placed in the receiving groove; the compression sleeve is placed inside the guide sleeve and on the side of the expansion sleeve; neither the guide sleeve nor the outer nut contacts the bare pipe; each end of the guide sleeve has an external thread; the external threads at both ends of the guide sleeve are in opposite directions; the external threads can mate with the internal thread of the outer nut. This utility model is a connection device that is easy to operate and does not damage the pipe surface.

Description

Technical Field

[0001] This utility model relates to the field of mechanical device technology, and in particular to a connection device for strength testing of bare pipes. Background Technology

[0002] Pipeline strength testing is a common method for assessing the pressure resistance of pipelines. Current pipeline strength testing methods, when testing multiple pipelines, require sequentially welding the bare ends of each pipeline before testing, followed by cutting afterward. This damages the pipeline surface and is inconvenient, increasing workload due to the need for welding before and after testing. Utility Model Content

[0003] This utility model mainly solves the technical problems of inconvenient operation and the need for welding in the existing technology, and proposes a connection device for bare pipe strength testing, so that multiple stainless steel pipes with bare ends can be connected to adjacent ports without welding, which facilitates the water pressure strength test of multiple stainless steel pipes in a pipeline system at one time.

[0004] This utility model provides a connection device for strength testing of bare pipes, including a guide sleeve, an expansion sleeve, a compression sleeve, and an outer nut;

[0005] The guide sleeve is cylindrical; receiving grooves are respectively provided on the inner walls of both ends of the guide sleeve; an expansion sleeve is placed in the receiving groove; a pressure sleeve is placed inside the guide sleeve and on the side of the expansion sleeve; external threads are respectively provided at both ends of the guide sleeve; the external threads at both ends of the guide sleeve are in opposite directions; the external threads can be threaded with the outer nut.

[0006] Furthermore, a first inclined surface is provided circumferentially on one side of the pressure sleeve.

[0007] Furthermore, the expansion sleeve has a circumferentially oriented plane on one side and a second inclined plane on the other side; one side of the plane can abut against the inner wall of the middle part of the guide sleeve.

[0008] Furthermore, the first inclined surface of the pressure sleeve can abut against the second inclined surface of the expansion sleeve.

[0009] Furthermore, the expansion sleeve is made of silicone material.

[0010] Furthermore, the pressure sleeve is made of nylon.

[0011] Furthermore, the outer nut is provided with multiple threaded holes along the circumference.

[0012] Furthermore, it also includes a tightening handle; the end of the tightening handle can engage with the threaded hole on the outer nut.

[0013] Furthermore, an anti-slip layer is provided at the end of the tightening handle.

[0014] Furthermore, a handle is provided on the outer wall of the guide sleeve.

[0015] Compared with the prior art, the connection device for bare pipe strength testing provided by this utility model has the following advantages:

[0016] 1. The connecting device of this utility model is directly sleeved between two adjacent bare pipes to connect them. Then, the connecting device is sleeved on the connection position for compression connection. This can greatly reduce the amount of repeated welding and cutting work during the water pressure strength test before the pipeline system is installed on site. It can reduce the amount of pipes used in the pipeline system, saving material costs and related labor costs.

[0017] 2. The connection device of this utility model achieves a tight seal through the expansion sleeve, eliminating the need for welding and preventing physical scratches and indentations on the surface of bare pipes.

[0018] 3. The connection device of this utility model is simple to operate, and the installation and disassembly speed is fast, which improves the work efficiency of installers and can be reused repeatedly. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the structure of this utility model patent;

[0020] Reference numerals in the attached diagram: 1. Outer nut; 2. Guide sleeve; 3. Expansion sleeve; 4. Pressure sleeve. Detailed Implementation

[0021] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0022] like Figure 1 As shown in the figure, the present invention provides a connection device for strength testing of bare pipes, including a guide sleeve 2, an expansion sleeve 3, a compression sleeve 4 and an outer nut 1;

[0023] The guide sleeve 2 is cylindrical; the diameter of the middle part of the guide sleeve 2 is smaller than the diameter of both ends of the guide sleeve 2; the guide sleeve is used to connect adjacent bare pipes, and the guide sleeve 2 does not contact the bare pipe, but there is a gap, the size of which is 2mm-5mm. The inner walls of both ends of the guide sleeve 2 are respectively provided with circumferential receiving grooves, and an expansion sleeve 3 is placed in the receiving grooves; the expansion sleeve 3 and the guide sleeve 2 are not fixedly connected. When using this connection device, the expansion sleeve 3 is placed in the receiving groove, and the expansion sleeve 3 is made of silicone. One side of the expansion sleeve 3 has a flat surface, and the other side has a second circumferential inclined surface; the flat side can abut against the inner wall of the receiving groove of the guide sleeve 2. In use, the expansion sleeve 3 is fitted onto the pipe, and then the flat side of the expansion sleeve 3 abuts against the inner wall of the receiving groove of the guide sleeve 2, which can achieve a seal at the connection.

[0024] After the above steps of the connecting device are performed, a pressure sleeve 4 can be placed inside both ends of the guide sleeve 2 and on the side of the expansion sleeve 3. A first inclined surface is provided on the contact side of the pressure sleeve 4 with the expansion sleeve 3, and the first inclined surface is located above the second inclined surface, so that the first inclined surface of the pressure sleeve 4 abuts against the second inclined surface of the expansion sleeve 3. The pressure sleeve 4 is made of nylon. The side of the pressure sleeve 4 away from the guide sleeve 2 can extend out of the guide sleeve 2. External threads are provided at both ends of the guide sleeve 2, and the directions of the external threads at both ends of the guide sleeve 2 are opposite. An outer nut 1 is fitted around the outer circumference of both ends of the guide sleeve 2, and the outer nut does not contact the bare pipe. The external thread of the guide sleeve 2 can engage with the internal thread of the outer nut 1. The pressure sleeve is placed between the guide sleeve 2 and the expansion sleeve 3, so that the inclined surface of the pressure sleeve is in close contact with the inclined surface of the expansion sleeve. When the outer nut 1 is tightened, pressure is applied to the pressure sleeve, continuously squeezing it, thereby applying pressure to the expansion sleeve 3, causing the expansion sleeve 3 to elastically deform under force, thus achieving a seal at the bare pipe connection.

[0025] The outer nut 1 has multiple threaded holes along its circumference.

[0026] This utility model also includes a tightening handle; the end of the tightening handle can mate with the threaded hole on the outer nut 1, and the curvature of the tightening handle is adapted to the curvature of the outer nut, so that the inner arc surface of the tightening handle is in close contact with the outer arc surface of the outer nut, thereby facilitating the tightening of the outer nut. An anti-slip layer is provided at the end of the tightening handle.

[0027] The outer wall of the guide sleeve 2 is provided with a handle, which is convenient for use. When using it, the handle is held to put the guide sleeve 2 on the outer wall of the pipeline.

[0028] The working principle of this utility model is as follows: The main function of this device is to seal the ends of adjacent bare pipes without welding, so that the pipeline system can be tested for water pressure strength.

[0029] Connect the pipe fittings that need to be tested together, align the bare ends of two adjacent pipe fittings, and then place the guide sleeve 2 on the connection of the two adjacent bare pipes, positioning the guide sleeve 2 at the center of the connection. Then, place two expansion sleeves 3 on the outer wall of the pipe, with the expansion sleeves 3 inside the two ends of the guide sleeve 2, and the flat end of the expansion sleeve 3 close to the inside of the guide sleeve 2. Then, put the pressure sleeve 4 into the pipe fitting, so that the inclined surface of the pressure sleeve is close to the inclined surface of the expansion sleeve 3. Then, put on the outer nut, and use the tightening handle to rotate the outer nut 1. The pressure sleeve is gradually tightened by the outer nut, and at the same time, the pressure sleeve gradually tightens the expansion sleeve. After the expansion sleeve is deformed by pressure, it plays a sealing role, making the two adjacent bare ends tightly sealed, thus conducting the strength test.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some or all of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A coupling device for use in a bare port pipe strength test, characterized in that It includes a guide sleeve (2), an expansion sleeve (3), a pressure sleeve (4), and an outer nut (1); The guide sleeve (2) is cylindrical; the inner walls of both ends of the guide sleeve (2) are respectively provided with receiving grooves; the receiving grooves are filled with expansion sleeves (3); the guide sleeve (2) is filled with pressure sleeves (4) inside the expansion sleeve (3) and on the side of the expansion sleeve (3); the guide sleeve (2) is respectively provided with external threads; the external threads at both ends of the guide sleeve (2) are opposite in direction; the external threads can be engaged with the internal threads of the outer nut (1).

2. The connection device for strength testing of a bare port pipe according to claim 1, characterized in that, The pressure sleeve (4) has a first inclined surface along the circumferential direction on one side.

3. The connection device for strength testing of a bare port pipe according to claim 2, characterized in that, The expansion sleeve (3) has a flat surface on one side and a second inclined surface on the other side in the circumferential direction; one side of the flat surface can abut against the inner wall of the guide sleeve (2) receiving groove.

4. The connection device for strength testing of bare pipes according to claim 3, characterized in that, The first inclined surface of the pressure sleeve (4) can abut against the second inclined surface of the expansion sleeve (3).

5. The connection device for strength testing of bare pipes according to claim 1, characterized in that, The expansion sleeve (3) is made of silicone.

6. The connection device for strength testing of bare pipes according to claim 1, characterized in that, The pressure sleeve (4) is made of nylon.

7. The connection device for strength testing of bare pipes according to claim 1, characterized in that, The outer nut (1) has multiple threaded holes along its circumference.

8. The connection device for strength testing of bare pipes according to claim 7, characterized in that, It also includes a tightening handle; the end of the tightening handle can engage with the threaded hole on the outer nut (1).

9. The connection device for strength testing of bare pipes according to claim 8, characterized in that, The end of the tightening handle is provided with an anti-slip layer.

10. The connection device for strength testing of bare pipes according to claim 1, characterized in that, The outer wall of the guide sleeve (2) is provided with a handle.

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