Clamping and pressing pipe fitting

Abstract

The utility model belongs to the technical field of pipelines, and particularly relates to a clamping and pressing pipe fitting which comprises a hollow pipe fitting body, more than two connecting pipes used for being connected with the pipelines are arranged on the pipe fitting body, the pipe wall of each connecting pipe protrudes outwards to form an annular bulge, and in the axial section, the inner side wall of each annular bulge comprises an arc section matched with a sealing ring. A connecting section is arranged between the first end point of the arc section and the inner side wall of the connecting pipe, a first straight line section is arranged between the second end point of the arc section and the inner side wall of the connecting pipe, the central angle alpha corresponding to the second end point of the arc section and the vertex is smaller than 90 degrees, and the included angle beta between the first straight line section and the radial direction of the connecting pipe ranges from 40 degrees to 65 degrees. The gap area between the first linear section and the sealing ring is larger than that between the connecting section and the sealing ring. The sealing ring is not prone to being damaged, deformation of the sealing ring is not serious, and the service life is long.

Description

Technical field:

[0001] The utility model belongs to the technical field of pipelines, in particular to a compression pipe fitting. Background technology:

[0002] In civil pipe water supply systems, copper compression fittings are usually used to connect two pipes, which have the advantages of easy installation, safety and easy maintenance. Figure 1 As shown, it usually includes a hollow pipe body 1, on which are provided more than two connecting pipes 2 for connecting pipes. The pipe wall of each connecting pipe 2 bulges outward to form an annular bulge 3, and the inner wall of the annular bulge 3 is tightly wrapped around the outside of the sealing ring 4. The sealing ring 4 is placed into the connecting pipe 2, and after the pipe is inserted, the annular bulge 3 is clamped with a crimping pliers to deform the annular bulge 3 and compress the sealing ring 4 and the pipe.

[0003] The shortcomings of the existing crimping pipe fittings are: before crimping, the gap between the inner wall of the annular bulge 3 and the sealing ring 4 is small, and the sealing ring is easily damaged during the crimping process, thereby causing leakage; at the same time, after the crimping is completed, the sealing ring is severely deformed, and premature aging will occur, resulting in a short service life. Summary of the invention:

[0004] The utility model aims to provide a clamping pipe fitting, which is not easy to damage the sealing ring, the sealing ring is not seriously deformed and has a long service life.

[0005] The utility model is achieved in this way:

[0006] A compression pipe fitting comprises a hollow pipe fitting body, on which are disposed more than two connecting pipes for connecting pipes, the pipe wall of each connecting pipe bulges outwardly to form an annular bulge, in an axial cross section, the inner side wall of the annular bulge comprises an arc segment adapted to a sealing ring, a connecting segment is disposed between a first end point of the arc segment and the inner side wall of the connecting pipe, a straight line segment 1 is disposed between a second end point of the arc segment and the inner side wall of the connecting pipe, a central angle α corresponding to a vertex of the second end point of the arc segment is less than 90°, an angle β between the straight line segment 1 and a radial direction of the connecting pipe is 40°-65°, and a gap area between the straight line segment 1 and the sealing ring is greater than a gap area between the connecting segment and the sealing ring.

[0007] In the above-mentioned compression fitting, the angle β between the straight line segment 1 and the radial direction of the connecting pipe is 45°-60°.

[0008] In the above-mentioned compression fitting, the central angle α corresponding to the second end point and the vertex of the arc segment is 40°-70°.

[0009] In the above-mentioned compression fitting, the central angle ε between the first end point of the arc segment and the vertex is greater than the central angle α between the second end point of the arc segment and the vertex, and is less than 90°.

[0010] In the above-mentioned compression fitting, one end of the straight line segment 1 transitions to the inner wall of the connecting pipe through rounded corner 1; the other end of the straight line segment 1 transitions to the arc segment through rounded corner 2, or the other end of the straight line segment 1 is tangent to the arc segment.

[0011] In the above-mentioned clamping pipe fitting, the annular bulge includes annular bulge one and annular bulge two arranged at intervals, annular bulge one is arranged at the end of the connecting pipe, annular bulge two is arranged on the inner side of annular bulge one, the connection structure between the second end point of annular bulge one and the inner side wall of the connecting pipe is the same as the connection structure between the second end point of annular bulge two and the inner side wall of the connecting pipe, the second end point of annular bulge one is located on the side close to annular bulge two, and the second end point of annular bulge two is located on the side close to annular bulge one.

[0012] In the above-mentioned clamping pipe fitting, the connecting section of the annular bulge one is the straight line segment two, the angle γ between the straight line segment two and the radial direction of the connecting pipe is smaller than the angle β between the straight line segment one and the radial direction of the connecting pipe, the straight line segment two and the arc segment are transitioned through the rounded corner three, or the straight line segment two and the arc segment are tangent to each other.

[0013] In the above-mentioned clamping pipe fitting, an annular back-stop groove is provided on the inner side wall of the end of the connecting pipe. In the axial section, the back-stop groove includes a straight line segment three and a straight line segment four. The straight line segment four is arranged radially. One end of the straight line segment three is connected to the straight line segment two and the other end is connected to the straight line segment four. The other end of the straight line segment four is connected to the inner side wall of the connecting pipe.

[0014] In the above-mentioned compression fitting, the end of the connecting pipe is provided with a straight pipe section located on the side of the annular bulge 1 away from the annular bulge 2, and the straight section 2 and the inner wall of the connecting pipe are transitioned by a rounded corner 4.

[0015] In the above-mentioned clamping pipe fitting, the connecting section of the annular bulge two is rounded corner five.

[0016] In the above-mentioned clamping pipe fitting, the fillet five and the arc segment are transitioned by fillet six, the radius of the fillet five is larger than the diameter of the fillet six, and the center of the fillet six is ​​closer to the arc segment in the axial direction and closer to the inner wall of the connecting pipe in the radial direction than the center of the fillet five.

[0017] In the above-mentioned clamping pipe fitting, the connecting section of the annular bulge 2 is a straight line segment 5, and the angle δ between the straight line segment 5 and the radial direction of the connecting pipe is smaller than the angle β between the straight line segment 1 and the radial direction of the connecting pipe. One end of the straight line segment 5 is transitioned to the inner side wall of the connecting pipe through a rounded corner 7, and the other end of the straight line segment 5 is tangent to the arc segment.

[0018] The outstanding advantages of the utility model compared with the prior art are:

[0019] 1. The gap area between the straight line segment 1 and the sealing ring of the utility model is large, leaving a large space for the sealing ring to deform. During the clamping process, when the straight line segment 1 moves and presses on the sealing ring, the straight line segment 1 is not easy to damage the sealing ring, and the deformation of the sealing ring is not serious, and the service life is long;

[0020] 2. An annular anti-retreat groove is provided on the inner side wall of the end of the pipe of the utility model. In the axial section, the anti-retreat groove includes a straight line segment three and a straight line segment four. The straight line segment four is arranged radially. One end of the straight line segment three is connected to the straight line segment two, and the other end is connected to the straight line segment four. The other end of the straight line segment four is connected to the inner side wall of the pipe, which has a good anti-retreat effect and can effectively prevent the pipe from falling out. Description of the drawings:

[0021] Figure 1 It is a cross-sectional view of the prior art before pressing;

[0022] Figure 2 It is a cross-sectional view of the pipe body of the first embodiment of the utility model before being pressed;

[0023] Figure 3 yes Figure 2 A magnified image of point A;

[0024] Figure 4 yes Figure 2 The enlarged view of point B;

[0025] Figure 5 It is a cross-sectional view of the first embodiment of the utility model before compression;

[0026] Figure 6 It is a cross-sectional view of the pipe body of the second embodiment of the utility model before being pressed;

[0027] Figure 7 It is a cross-sectional view of the pipe body of the third embodiment of the utility model before being pressed.

[0028] Reference numerals:

[0029] Figure 1 In: 1. Pipe fitting body; 2. Pipe connection; 3. Annular bulge; 4. Sealing ring.

[0030] Figure 2-5 In: 11. Pipe body; 12. Connecting pipe; 13. Sealing ring; 14. Arc segment; 15. Straight segment one; 16. Fillet one; 17. Fillet two; 18. Annular bulge one; 19. Annular bulge two; 20. Straight segment two; 21. Fillet three; 22. Stop groove; 23. Straight segment three; 24. Straight segment four; 25. Straight pipe segment; 26. Fillet four; 27. Fillet five; 28. Fillet six; 29. ​​Straight segment five; 30. Fillet seven. Specific implementation method:

[0031] The present invention is further described below with reference to specific embodiments. Figure 2 —7:

[0032] Example 1: Participation Figure 2-5 :

[0033] A compression pipe fitting comprises a hollow pipe fitting body 11, on which are disposed more than two connecting pipes 12 for connecting pipes, the pipe wall of each connecting pipe 12 bulges outward to form an annular bulge, and in an axial cross section, the inner wall of the annular bulge comprises an arc segment 14 adapted to a sealing ring 13, a connecting segment is disposed between a first end point of the arc segment 14 and the inner wall of the connecting pipe 12, a straight line segment 15 is disposed between a second end point of the arc segment 14 and the inner wall of the connecting pipe 12, a central angle α corresponding to a vertex of the second end point of the arc segment 14 is less than 90°, an angle β between the straight line segment 15 and the radial direction of the connecting pipe 12 is 40°-65°, and a gap area between the straight line segment 15 and the sealing ring 13 is greater than a gap area between the connecting segment and the sealing ring 13.

[0034] like Figure 2-5 As shown, the utility model sets a straight line segment 15 at the second end point of the arc segment 14, and the central angle α corresponding to the second end point of the arc segment 14 and the vertex is less than 90°, and the radial angle β between the straight line segment 15 and the pipe 12 is 40°-65°. The gap area between the straight line segment 15 and the sealing ring 13 is large, leaving a large space for the sealing ring 13 to deform. During the clamping process, when the straight line segment 15 moves and is pressed on the sealing ring 13, the straight line segment 15 is not easy to damage the sealing ring 13, and the deformation of the sealing ring 13 is not serious, and the service life is long.

[0035] Preferably, the angle β between the straight line segment 15 and the connecting pipe 12 in the radial direction is 45°-60°. In this embodiment, the angle β between the straight line segment 15 and the connecting pipe 12 in the radial direction is 50°.

[0036] Furthermore, the central angle α between the second end point and the vertex of the arc segment 14 is 40°-70°.

[0037] Preferably, the central angle ε between the first end point of the arc segment 14 and the vertex is greater than the central angle α between the second end point of the arc segment 14 and the vertex, and is less than 90°.

[0038] In order to avoid the sharp corners piercing the sealing ring 13, Figure 3 , 4 As shown, one end of the straight line segment 15 transitions to the inner wall of the connecting pipe 12 via a rounded corner 16 , and the other end of the straight line segment 15 transitions to the arc segment 14 via a rounded corner 2 17 .

[0039] Traditional crimping tools usually have a hexagonal inner side. During crimping, the two crimping arms of the crimping tool are located on both sides of the same annular bulge, and the crimping is completed by squeezing, that is, the crimping of an annular bulge is completed in one operation. At this time, the squeezing deformation of the annular bulge is relatively large.

[0040] The new type of crimping tool is usually circular on the inner side. During crimping, the crimping tool is located between two annular bulges, one crimping arm of the crimping tool is located on one side of one annular bulge, and the other crimping arm is located on one side of the other annular bulge. The two crimping arms squeeze their respective annular bulges simultaneously to complete the crimping of the two annular bulges, that is, the crimping of the two annular bulges is completed in one operation. At this time, the two annular bulges are slightly deformed, and the deformation is small.

[0041] In order to better seal the clamped pipe fittings and pipelines, the annular bulge includes annular bulge 18 and annular bulge 19 arranged at intervals. The annular bulge 18 is arranged at the end of the connecting pipe 12, and the annular bulge 19 is arranged on the inner side of the annular bulge 18. The connection structure between the second end point of the annular bulge 18 and the inner wall of the connecting pipe 12 is the same as the connection structure between the second end point of the annular bulge 19 and the inner wall of the connecting pipe 12. The second end point of the annular bulge 18 is located on the side close to the annular bulge 19, and the second end point of the annular bulge 19 is located on the side close to the annular bulge 18, so that the new clamping tool can be used to complete the clamping of the annular bulge 18 and the annular bulge 19 in one operation.

[0042] The connecting section structure of the annular bulge 18 is as follows: Figure 4 As shown, the connecting section of the annular bulge 18 is a straight line segment 20, and the radial angle γ between the straight line segment 20 and the connecting pipe 12 is smaller than the radial angle β between the straight line segment 15 and the connecting pipe 12. The straight line segment 20 and the arc segment 14 are transitioned through a rounded corner 3 21.

[0043] In order to hold the pipe and prevent it from falling out, an annular anti-retraction groove 22 is provided on the inner wall of the end of the connecting pipe 12. In the axial section, the anti-retraction groove 22 includes a straight line segment 3 23 and a straight line segment 4 24. The straight line segment 4 24 is arranged radially. One end of the straight line segment 3 23 is connected to the straight line segment 20, and the other end is connected to the straight line segment 4 24. The other end of the straight line segment 4 24 is connected to the inner wall of the connecting pipe 12. The anti-retraction effect is good and the pipe can be effectively prevented from falling out.

[0044] The connecting section structure of the annular bulge 2 19 is as follows: Figure 3 As shown, the connecting section of the annular bulge 2 19 is a rounded corner 5 27 .

[0045] Furthermore, the fillet five 27 and the arc segment 14 are transitioned by a fillet six 28, the radius of the fillet five 27 is greater than the diameter of the fillet six 28, and the center of the fillet six 28 is closer to the arc segment 14 in the axial direction and closer to the inner wall of the connecting pipe 12 in the radial direction compared to the center of the fillet five 27.

[0046] Example 2: See Figure 6 :

[0047] The structure of this embodiment is basically the same as that of the first embodiment, and the main difference is that the other end of the straight line segment 15 is tangent to the arc segment 14, and the straight line segment 20 is tangent to the arc segment 14. In this embodiment, the angle β between the straight line segment 15 and the radial direction of the pipe 12 is 47°.

[0048] The structure of the connecting section of the annular bulge 19: The connecting section of the annular bulge 19 is a straight line segment 5 29, the angle δ between the straight line segment 5 29 and the radial direction of the pipe 12 is smaller than the angle β between the straight line segment 15 and the radial direction of the pipe 12, one end of the straight line segment 5 29 transitions to the inner side wall of the pipe 12 through a fillet 7 30, and the other end of the straight line segment 5 29 is tangent to the arc segment 14. The gap area between the straight line segment 5 and the sealing ring 13 is large, leaving a large space for the sealing ring 13 to deform, and the sealing ring 13 is not easily lost during compression, and the deformation is not serious, and the service life is long.

[0049] Example 3: Participation Figure 7 :

[0050] The structure of this embodiment is basically the same as that of the above-mentioned embodiment 2, and the main difference lies in: the end structure of the connecting pipe 12 and the connection method between the straight line segment 20 and the inner wall of the connecting pipe 12 are different. In this embodiment, the end of the connecting pipe 12 is provided with a straight pipe segment 25 located on the side of the annular bulge 18 away from the annular bulge 2 19, and the straight line segment 20 and the inner wall of the connecting pipe 12 are transitioned by a rounded corner 4 26.

[0051] A straight pipe section 25 is provided at the end of the connecting pipe 12 to provide sufficient pressing space for conventional pressing tools, so that the pressing pipe fitting of this embodiment is applicable not only to new pressing tools but also to conventional pressing tools.

[0052] When the new type of pressing tool is used, the method of use is the same as that of the first embodiment.

[0053] When using traditional crimping tools, due to the large deformation of the annular bulge, it is only necessary to crimp the annular bulge 18 located at the end, and there is no need to crimp the annular bulge 19. The sealing ring 13 located in the annular bulge 18 is squeezed and compressed, and the sealing ring 13 located in the annular bulge 19 is naturally compressed.

[0054] At the same time, the straight pipe section 25 is provided to guide the pipe when installing the pipe, which facilitates the installation of the pipe and prevents the pipe insertion angle from being excessively tilted, thereby causing the pipe end to damage the sealing ring 13.

[0055] The above embodiment is only one of the preferred embodiments of the present utility model, and is not intended to limit the scope of implementation of the present utility model. Therefore, any equivalent changes made based on the shape, structure, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A compression pipe fitting, comprising a hollow pipe fitting body (11), on which are disposed at least two pipe fittings (12) for connecting pipes, wherein the pipe wall of each pipe fitting (12) bulges outwardly to form an annular bulge, characterized in that: In the axial cross section, the inner side wall of the annular bulge comprises an arc segment (14) adapted to the sealing ring (13), a connecting segment is provided between the first end point of the arc segment (14) and the inner side wall of the connecting pipe (12), a straight line segment (15) is provided between the second end point of the arc segment (14) and the inner side wall of the connecting pipe (12), the central angle corresponding to the second end point of the arc segment (14) and the vertex is less than 90°, the radial angle between the straight line segment (15) and the connecting pipe (12) is 40°-65°, and the gap area between the straight line segment (15) and the sealing ring (13) is greater than the gap area between the connecting segment and the sealing ring (13).

2. A compression fitting according to claim 1, characterized in that: One end of the straight line segment 1 (15) transitions to the inner side wall of the pipe (12) via a rounded corner 1 (16); the other end of the straight line segment 1 (15) transitions to the arc segment (14) via a rounded corner 2 (17), or the other end of the straight line segment 1 (15) is tangent to the arc segment (14).

3. A compression fitting according to claim 1, characterized in that: The annular bulge comprises an annular bulge 1 (18) and an annular bulge 2 (19) which are arranged at intervals, the annular bulge 1 (18) being arranged at the end of the pipe (12), the annular bulge 2 (19) being arranged on the inner side of the annular bulge 1 (18), the connection structure between the second end point of the annular bulge 1 (18) and the inner side wall of the pipe (12) being the same as the connection structure between the second end point of the annular bulge 2 (19) and the inner side wall of the pipe (12), the second end point of the annular bulge 1 (18) being located close to the side of the annular bulge 2 (19), and the second end point of the annular bulge 2 (19) being located close to the side of the annular bulge 1 (18).

4. A compression fitting according to claim 3, characterized in that: The connecting section of the annular bulge 1 (18) is a straight line section 2 (20), the angle between the straight line section 2 (20) and the radial direction of the connecting pipe (12) is smaller than the angle between the straight line section 1 (15) and the radial direction of the connecting pipe (12), and the straight line section 2 (20) and the arc section (14) are transitioned through a rounded corner 3 (21), or the straight line section 2 (20) and the arc section (14) are tangent.

5. A compression fitting according to claim 4, characterized in that: An annular anti-retraction groove (22) is provided on the inner side wall of the end of the connecting pipe (12). In the axial section, the anti-retraction groove (22) includes a straight line segment three (23) and a straight line segment four (24). The straight line segment four (24) is arranged along the radial direction. One end of the straight line segment three (23) is connected to the straight line segment two (20) and the other end is connected to the straight line segment four (24). The other end of the straight line segment four (24) is connected to the inner side wall of the connecting pipe (12).

6. A compression fitting according to claim 4, characterized in that: The end of the connecting pipe (12) is provided with a straight pipe section (25) located on the side of the annular bulge one (18) away from the annular bulge two (19), and the straight section two (20) and the inner side wall of the connecting pipe (12) are transitioned through a rounded corner four (26).

7. The compression fitting according to claim 3, characterized in that: The connecting section of the annular bulge 2 (19) is rounded corner 5 (27).

8. A compression fitting according to claim 7, characterized in that: The fillet five (27) and the arc segment (14) are transitioned through the fillet six (28); the radius of the fillet five (27) is greater than the diameter of the fillet six (28); and the center of the fillet six (28) is closer to the arc segment (14) in the axial direction and closer to the inner wall of the connecting pipe (12) in the radial direction than the center of the fillet five (27).

9. The compression fitting according to claim 3, characterized in that: The connecting section of the annular bulge 2 (19) is a straight line segment 5 (29), the angle between the straight line segment 5 (29) and the radial direction of the connecting pipe (12) is smaller than the angle between the straight line segment 1 (15) and the radial direction of the connecting pipe (12), one end of the straight line segment 5 (29) transitions to the inner side wall of the connecting pipe (12) through a rounded corner 7 (30), and the other end of the straight line segment 5 (29) is tangent to the arc segment (14).

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