Copper insert for polyolefin pipe fitting

Abstract

The utility model provides a copper insert for a polyolefin pipe fitting, and belongs to the technical field of copper inserts. The problem that in the prior art, connection stability between a pipe fitting and a copper insert is poor is solved. The copper insert for the polyolefin pipe fitting comprises a cylindrical copper insert body, the outer side wall of the copper insert body is provided with a plurality of annular anti-disengaging grooves formed in the axial direction, the cross section of each annular anti-disengaging groove is in a trapezoid shape, the inner side wall of the copper insert body is provided with an annular groove, and the cross section of each annular groove is in a trapezoid shape. The annular grooves are located between every two adjacent annular anti-disengagement grooves, the cross sections of the annular grooves are rectangular, and a plurality of anti-rotation blocks arranged in the circumferential direction are arranged on the end face, close to the annular anti-disengagement grooves, of the copper insert body. The copper insert has the advantage that the connection stability between the pipe fitting and the copper insert can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of copper inserts and relates to a copper insert for polyolefin pipe fittings. Background Art

[0002] Copper inserts are commonly known as copper inserts, copper inserts, inlaid copper nuts, injection-molded copper nuts, etc. They are copper accessories embedded in plastic. The specific operation method is to heat the copper insert and then embed it into the plastic part or place the copper insert in the mold in advance and injection-molded it into an integrated structure with the plastic part. For example, a Chinese patent document discloses a plastic pipe joint with a copper insert (application number: 201320704003.4), which includes a first plastic pipe joint body and a second plastic pipe joint body. A first extension portion is provided on the inner wall of the first plastic pipe joint body, and a gap is provided between the first extension portion and the inner copper insert. A second extension portion is provided on the inner wall of the second plastic pipe joint body. The first plastic pipe joint body and the second plastic pipe joint body are screwed together by the inner copper insert and the outer copper insert.

[0003] At present, the copper inserts on the market usually only have multiple annular water stop grooves on the outer wall of the copper insert (refer to the copper insert disclosed in the above-mentioned plastic pipe joint with copper insert). During actual use, when the two copper inserts are rotated and installed, it is easy to cause the copper insert and the plastic pipe fitting to twist and loosen, resulting in separation of copper and plastic, and causing the problem of loose connection between the copper insert and the plastic pipe fitting. Summary of the Invention

[0004] The purpose of this utility model is to solve the above problems in the existing technology and propose a copper insert for polyolefin pipe fittings. The technical problem to be solved by this utility model is how to improve the connection stability between the pipe fitting and the copper insert.

[0005] The purpose of this utility model can be achieved through the following technical solutions:

[0006] A copper insert for polyolefin pipe fittings, comprising a cylindrical copper insert body, the outer side wall of the copper insert body having a plurality of annular anti-slip grooves arranged along the axial direction, characterized in that the cross-section of the annular anti-slip groove is trapezoidal, the inner side wall of the copper insert body having an annular groove, the annular groove being located between two adjacent annular anti-slip grooves and having a rectangular cross-section, and the end surface of the copper insert body close to the annular anti-slip groove having a plurality of anti-rotation blocks arranged along the circumferential direction.

[0007] The copper insert for polyolefin pipe fittings is provided with a plurality of annular anti-slip grooves on its outer side wall and annular grooves on its inner side wall, and a plurality of anti-rotation blocks are provided on its end face close to the annular anti-slip grooves. Therefore, after the copper insert for polyolefin pipe fittings is connected to the plastic pipe fitting, the copper insert can be prevented from circumferential rotation and axial displacement relative to the plastic pipe fitting, that is, the anti-slip ability and anti-torsion ability are good. At the same time, the cross-section of the annular anti-slip groove is trapezoidal, and the cross-section of the annular groove is rectangular, which can greatly increase the contact area between the copper insert and the pipe fitting, and increase the longitudinal force of the copper insert embedded in the plastic pipe fitting, thereby preventing water from penetrating into the gap between the copper insert and the plastic after being pressurized, and is not easy to peel off, and at the same time plays the role of anti-slip and sealing, thereby improving the stability of the connection between the pipe fitting and the copper insert.

[0008] In the aforementioned copper insert for polyolefin pipe fittings, the anti-rotation blocks are rectangular and evenly distributed along the circumference of the copper insert body, thereby improving the connection stability between the pipe fitting and the copper insert while taking into account the processing and manufacturing of the copper insert.

[0009] In the aforementioned copper insert for polyolefin pipe fittings, the cross-section of the annular anti-slip groove is an isosceles trapezoidal shape, and the plurality of annular anti-slip grooves are evenly distributed along the axial direction of the copper insert body, thereby improving the connection stability between the pipe fitting and the copper insert while taking into account the processing and manufacturing of the copper insert.

[0010] In the aforementioned copper insert for a polyolefin pipe fitting, the annular groove is located midway between two adjacent annular anti-slip grooves. This makes the annular groove more appropriately positioned, avoiding weakening the structural strength of the copper insert due to the annular groove. This improves the connection stability between the pipe fitting and the copper insert while also maintaining the structural strength of the copper insert.

[0011] In the aforementioned copper insert for a polyolefin pipe fitting, the inner sidewall of the copper insert body has a plurality of axially staggered annular steps. The axially staggered annular steps further prevent axial displacement and provide a seal, thereby enhancing the connection stability between the pipe fitting and the copper insert.

[0012] In the above-mentioned copper insert for polyolefin pipe fittings, the outer side wall of the copper insert body away from the annular anti-slip groove has an annular outer step portion, which can serve as a limit to prevent excessive rotation when the copper insert is connected to another copper insert.

[0013] Compared with the prior art, the advantages of the copper insert for polyolefin pipe fittings are that the copper insert for polyolefin pipe fittings is provided with a plurality of annular anti-slip grooves on its outer side wall and an annular groove on its inner side wall, and a plurality of anti-rotation blocks are provided on its end face close to the annular anti-slip groove. Therefore, after the copper insert for polyolefin pipe fittings is connected to the plastic pipe fitting, the copper insert can be prevented from circumferential rotation and axial displacement relative to the plastic pipe fitting, that is, the anti-slip ability and anti-torsion ability are good. At the same time, the cross-section of the annular anti-slip groove is trapezoidal and the cross-section of the annular groove is rectangular, which can greatly increase the contact area between the copper insert and the pipe fitting, and increase the longitudinal force of the copper insert embedded in the plastic pipe fitting, thereby preventing water from penetrating into the gap between the copper insert and the plastic under pressure, and playing the role of anti-slip and sealing, thereby improving the stability of the connection between the pipe fitting and the copper insert. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a cross-sectional view of the copper insert for polyolefin pipe fittings.

[0015] Figure 2 It is a schematic diagram of the structure of the copper insert for polyolefin pipe fittings when viewed from above.

[0016] In the figure, 1 is the copper insert body; 1a is the annular anti-slip groove; 1b is the annular groove; 1c is the anti-rotation block; 1d is the annular step portion; 1e is the outer step portion. DETAILED DESCRIPTION

[0017] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0018] A copper insert for polyolefin pipe fittings, Figure 1-2 , including a cylindrical copper insert body 1, the outer side wall of the copper insert body 1 has a plurality of annular anti-slip grooves 1a arranged along the axial direction, and the cross-section of the annular anti-slip groove 1a is trapezoidal, the inner side wall of the copper insert body 1 has an annular groove 1b, the annular groove 1b is located between two adjacent annular anti-slip grooves 1a, and the cross-section of the annular groove 1b is rectangular, and the end surface of the copper insert body 1 close to the annular anti-slip groove 1a has a plurality of anti-rotation blocks 1c arranged along the circumferential direction.

[0019] In this embodiment, the anti-rotation block 1c is preferably rectangular and evenly distributed along the circumference of the copper insert body 1; the cross-section of the annular anti-slip groove 1a is an isosceles trapezoidal shape, and several annular anti-slip grooves 1a are evenly distributed along the axial direction of the copper insert body 1; the annular groove 1b is located in the middle of two adjacent annular anti-slip grooves 1a.

[0020] Further, refer to Figure 1 and Figure 2The inner side wall of the copper insert body 1 has a plurality of annular step portions 1d arranged in an axially staggered manner; the outer side wall of the copper insert body 1 away from the annular anti-slip groove 1a has an annular outer step portion 1e.

[0021] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A copper insert for polyolefin pipe fittings, comprising a cylindrical copper insert body (1), wherein the outer wall of the copper insert body (1) has a plurality of annular anti-slip grooves (1a) arranged along the axial direction, characterized in that: The cross section of the annular anti-slip groove (1a) is trapezoidal in shape, an annular groove (1b) is provided on the inner side wall of the copper insert body (1), the annular groove (1b) is located between two adjacent annular anti-slip grooves (1a), and the cross section of the annular groove (1b) is rectangular in shape, and the copper insert body (1) has a plurality of anti-rotation blocks (1c) arranged along the circumferential direction on the end surface close to the annular anti-slip groove (1a).

2. The copper insert for polyolefin pipe fittings according to claim 1, characterized in that: The anti-rotation blocks (1c) are rectangular and evenly distributed along the circumference of the copper insert body (1).

3. The copper insert for polyolefin pipe fittings according to claim 1, characterized in that: The cross section of the annular anti-slip groove (1a) is in the shape of an isosceles trapezoid, and a plurality of annular anti-slip grooves (1a) are evenly distributed along the axial direction of the copper insert body (1).

4. The copper insert for polyolefin pipe fittings according to claim 1, characterized in that: The annular groove (1b) is located in the middle of two adjacent annular anti-slip grooves (1a).

5. The copper insert for polyolefin pipe fittings according to any one of claims 1 to 4, characterized in that: The inner side wall of the copper insert body (1) is provided with a plurality of annular step portions (1d) staggered in the axial direction.

6. The copper insert for polyolefin pipe fittings according to claim 5, characterized in that: The copper insert body (1) has an annular outer step portion (1e) on its outer side wall away from the annular anti-slip groove (1a).

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