Pipe fitting joint for multi-layer composite type pipe hot melting bell and spigot

Abstract

The utility model relates to a pipe fitting joint for hot melting bell and spigot of a multi-layer composite pipe. The technical problems that an existing pipe fitting is complex in structure and the drift diameter cannot be guaranteed are solved. Comprising a pipe fitting main body, one end of the pipe fitting main body is provided with a double-hot-melting bellmouth which is axially arranged and allows a multi-layer composite pipe to be inserted, the other end of the pipe fitting main body is provided with a pipe fitting bellmouth which is axially arranged and allows a connecting pipe fitting to be connected in a sleeved mode, and the double-hot-melting bellmouth and the pipe fitting bellmouth communicate with each other and are coaxially arranged. The inner diameter of the double-hot-melting bellmouth is larger than that of the pipe fitting bellmouth, and an annular inner step is arranged between the double-hot-melting bellmouth and the pipe fitting bellmouth. The pipe fitting has the advantages that the pipe fitting main body, the large tubular part and the small tubular part are integrally injection-molded, the structure is simple, and the production cost is reduced. Through the connecting pipe fitting arranged on the annular outer step and the small tubular part in a sleeving mode, the water mixing risk of the hot melt adhesive of the middle layer can be reduced, and the safety of the pipeline system in the using process is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipe fittings, and in particular relates to a pipe fitting joint for hot-melt socket-and-spigot pipes of multi-layer composite pipes. Background Art

[0002] For multi-layer composite pipes, especially those using socket-type aluminum-plastic composite pipes and inner oxygen-barrier pipes with the barrier layer located in the middle layer of the pipe, during the construction of the pipeline system, the safety of the pipeline system is guaranteed by matching double hot-melt socket fittings. However, due to the great difficulty in the mold development process of double hot-melt fittings, even if a feasible mold is developed, the relatively complex internal structure makes it impossible to guarantee the diameter size of the pipe fittings. The complex results in increased production costs, which hinders the application, promotion and development of multi-layer composite pipe systems. Summary of the invention

[0003] The utility model aims to solve the above problems and provides a multi-layer composite pipe fitting joint for hot-melt socket-and-spigot pipes.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a pipe fitting joint for hot-melt socket and spigot of multi-layer composite pipes, comprising a pipe fitting body, one end of the pipe fitting body having an axially arranged double hot-melt socket for inserting the multi-layer composite pipe, and the other end of the pipe fitting body having an axially arranged pipe fitting socket for connecting the pipe fitting, the double hot-melt socket and the pipe fitting socket being interconnected and coaxially arranged, the inner diameter of the double hot-melt socket being larger than the inner diameter of the pipe fitting socket, and an annular inner step being provided between the double hot-melt socket and the pipe fitting socket, the annular inner step can facilitate the connection between the multi-layer composite pipe and the pipe fitting body, thereby improving the connection efficiency.

[0005] In the above-mentioned multi-layer composite pipe hot-melt socket fitting joint, the pipe fitting body includes a coaxially arranged large tubular portion and a small tubular portion, the outer diameter of the large tubular portion is larger than the outer diameter of the small tubular portion, and an annular outer step is formed between the circumferential outer side of one end of the large tubular portion and the circumferential outer side of one end of the small tubular portion, and the annular outer step facilitates the fixed connection between the pipe fitting and the pipe fitting body.

[0006] In the above-mentioned multi-layer composite pipe hot-melt socket fitting joint, the pipe body is made of thermoplastic plastic material and the large tubular part and the small tubular part are integrally formed by injection molding. The pipe body has a simple structure and reduces production costs.

[0007] In the above-mentioned multi-layer composite pipe hot-melt socket pipe fitting joint, the annular outer step and the annular inner step are arranged in a staggered manner with each other, the annular outer step is close to the pipe socket side and the annular inner step is close to the double hot-melt socket side, and the multi-layer composite pipe is fixedly connected to the pipe body through the double hot-melt socket arranged on the annular inner step, and the connecting pipe is fixedly connected to the pipe body through the pipe socket sleeve arranged on the circumferential outside of the annular outer step.

[0008] In the above-mentioned multi-layer composite pipe hot-melt socket fitting joint, an annular groove is provided on the annular inner step, and the annular groove opens toward one end of the double hot-melt socket away from the socket of the pipe fitting. The multi-layer composite pipe is extended in the annular groove, and the annular groove can improve the connection effect between the multi-layer composite pipe and the annular inner step, thereby ensuring the connection effect between the multi-layer composite pipe and the pipe fitting body and improving the sealing effect.

[0009] In the above-mentioned multi-layer composite pipe hot-melt socket fitting joint, the double hot-melt socket is formed on the circumferential inner side of the large tubular portion, the pipe fitting socket is formed on the circumferential inner side of the small tubular portion, and one end of the small tubular portion extends axially to the circumferential inner side of the large tubular portion to form the above-mentioned annular inner step, which can improve the connection stability between the multi-layer composite pipe and the pipe fitting body.

[0010] In the above-mentioned multi-layer composite pipe hot-melt socket fitting joint, the connecting pipe fitting is sleeved on the small tubular portion and one end of the connecting pipe fitting rests on the annular outer step, and the multi-layer composite pipe is inserted into the large tubular portion and one end of the multi-layer composite pipe rests on the annular inner step, which can reduce the risk of water leakage in the middle layer of hot melt adhesive and improve the safety of the pipeline system during use.

[0011] In the above-mentioned multi-layer composite pipe hot-melt socket fitting, the inner diameter of the double hot-melt socket is equal to the inner diameter of the connecting pipe or the outer diameter of the small tubular part, which can reduce the risk of water leakage in the middle layer of hot-melt adhesive and improve the safety of the pipeline system during use.

[0012] In the above-mentioned multi-layer composite pipe hot-melt socket pipe fitting joint, a metal bushing is provided on the circumferential inner side of one end of the pipe socket close to the double hot-melt socket. The metal bushing can prevent the pipe body from shrinking in diameter during the hot-melt welding process, thereby ensuring the fluidity of the pipe body.

[0013] In the above-mentioned multi-layer composite pipe hot-melt socket fitting joint, the material of the pipe fitting body is any one of PP-R, PB, PE or PE-RT.

[0014] Compared with the existing technology, the advantages of the utility model are:

[0015] 1. The pipe body, the large tubular part and the small tubular part are integrally injection molded, which has a simple structure and reduces production costs.

[0016] 2. The annular inner step can facilitate the connection between the multilayer composite pipe and the pipe fitting body, thereby improving the connection efficiency, and the annular outer step can facilitate the connection between the pipe fitting and the pipe fitting body, thereby further improving the connection efficiency.

[0017] 3. The connecting pipe fittings sleeved on the annular outer step and the small tubular portion can reduce the risk of water leakage from the middle layer of hot melt adhesive, thereby improving the safety of the pipeline system during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the first embodiment of the utility model.

[0019] Figure 2 It is a structural explosion diagram of the first embodiment of the present utility model.

[0020] Figure 3 It is a structural schematic diagram of the connecting pipe fitting in the first embodiment of the utility model.

[0021] Figure 4 It is a side view of the connecting pipe fitting in the first embodiment of the utility model.

[0022] Figure 5 It is a structural cross-sectional view of the connecting pipe fitting in the first embodiment of the utility model.

[0023] Figure 6 It is a structural schematic diagram of the second embodiment of the present utility model.

[0024] In the figure: pipe fitting body 1, double hot-melt socket 11, pipe fitting socket 12, annular inner step 13, annular groove 131, large tubular portion 14, small tubular portion 15, annular outer step 16, multi-layer composite pipe 2, connecting pipe fitting 3, metal bushing 4. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] Embodiment 1

[0027] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, this is a pipe fitting joint for hot-melt socket and spigot of multi-layer composite pipes, comprising a pipe fitting body 1, one end of which is provided with a double hot-melt socket 11 axially arranged for inserting the multi-layer composite pipe 2, the double hot-melt socket 11 can make up for the shortcoming that the multi-layer composite pipe 2 and the double hot-melt pipe fitting socket and spigot system have too few types of matching pipe fittings, and the other end of the pipe fitting body 1 is provided with a pipe fitting socket 12 axially arranged for sleeve connection of the connecting pipe fitting 3, the pipe fitting socket 12 can be used to connect all types of connecting pipe fittings 3 of the same material through normal hot-melt socket matching, the double hot-melt socket 11 and the pipe fitting socket 12 are interconnected and coaxially arranged, the inner diameter of the double hot-melt socket 11 is larger than the inner diameter of the pipe fitting socket 12, and an annular inner step 13 is provided between the double hot-melt socket 11 and the pipe fitting socket 12, the annular inner step 13 can facilitate the connection of the multi-layer composite pipe 2 with the pipe fitting body 1, and improve the connection efficiency.

[0028] Specifically, the pipe fitting body 1 includes a coaxially arranged large tubular portion 14 and a small tubular portion 15, the outer diameter of the large tubular portion 14 is larger than the outer diameter of the small tubular portion 15, and an annular outer step 16 is formed between the circumferential outer side of one end of the large tubular portion 14 and the circumferential outer side of one end of the small tubular portion 15, and the annular outer step 16 facilitates the fixed connection between the pipe fitting 3 and the pipe fitting body 1.

[0029] The pipe body 1 is made of thermoplastic material and the large tubular portion 14 and the small tubular portion 15 are integrally formed by injection molding. The pipe body 1 has a simple structure and reduces production costs.

[0030] like Figure 1 , Figure 2 , Figure 5 As shown, the annular outer step 16 and the annular inner step 13 are staggered with each other, which can ensure the connection stability between the pipe body 1 and the multilayer composite pipe 2 and the connecting pipe 3. The annular outer step 16 is close to the pipe socket 12 side and the annular inner step 13 is close to the double hot-melt socket 11 side, and the multilayer composite pipe 2 is fixedly connected to the pipe body 1 through the double hot-melt socket 11 arranged on the annular inner step 13, and the connecting pipe 3 is fixedly connected to the pipe body 1 through the pipe socket 12 arranged on the circumferential outside of the annular outer step 16.

[0031] Furthermore, an annular groove 131 is provided on the annular inner step 13, and the annular groove 131 opens toward one end of the double hot-melt socket 11 away from the pipe socket 12. The multilayer composite pipe 2 is extended in the annular groove 131, and the annular groove 131 can improve the connection effect between the multilayer composite pipe 2 and the annular inner step 13, thereby ensuring the connection effect between the multilayer composite pipe 2 and the pipe body 1, and can improve the sealing effect.

[0032] Among them, the double hot-melt socket 11 is formed on the circumferential inner side of the large tubular portion 14, and the pipe socket 12 is formed on the circumferential inner side of the small tubular portion 15. One end of the small tubular portion 15 extends axially to the circumferential inner side of the large tubular portion 14 to form the above-mentioned annular inner step 13. The connecting pipe fitting 3 is sleeved on the circumferential outer side of the annular inner step 13 and is fixedly connected to the small tubular portion 15 by a hot-melt socket method, which can improve the connection effect between the connecting pipe fitting 3 and the pipe fitting body 1, and can reduce the risk of water penetration of the middle layer of hot melt adhesive, thereby improving the safety of the pipe fitting body 1 during use.

[0033] Combination Figure 1 , Figure 2 , Figure 5 As shown, the connecting pipe fitting 3 is sleeved on the small tubular portion 15 and one end of the connecting pipe fitting 3 abuts against the annular outer step 16, which can improve the connection stability between the connecting pipe fitting 3 and the pipe fitting body 1, and the multi-layer composite pipe 2 is inserted into the large tubular portion 14 and one end of the multi-layer composite pipe 2 abuts against the annular inner step 13, which can improve the connection stability between the multi-layer composite pipe 2 and the pipe fitting body 1.

[0034] Among them, the inner diameter of the double hot-melt socket 11 is equal to the inner diameter of the connecting pipe 3 or the outer diameter of the small tubular part 15, which can reduce the risk of water leakage of the middle layer of hot-melt adhesive and improve the safety of the pipeline system during use.

[0035] Furthermore, the material of the pipe body 1 is any one of PP-R, PB, PE or PE-RT.

[0036] The principle of this embodiment is that one end of the pipe body 1 is hot-melt connected to the multi-layer composite pipe 2 through a double hot-melt socket 11, and the other end of the pipe body 1 is hot-melt connected to the connecting pipe 3 through a pipe socket 12, thereby improving the connection efficiency. The pipe body 1 is integrally injection molded to reduce production costs. The annular outer step 16 and the small tubular portion 15 can effectively reduce the risk of water leakage in the middle layer of hot-melt adhesive, thereby improving the safety of the pipeline system during use.

[0037] Embodiment 2

[0038] The structure and working principle of this embodiment are basically the same as those of the first embodiment, except that: Figure 6 As shown, a metal bushing 4 is provided on the inner side of one end of the pipe socket 12 close to the double hot-melt socket 11 . The metal bushing 4 can prevent the pipe body 1 from shrinking in diameter during the hot-melt welding process, thereby ensuring the fluidity of the pipe body 1 .

[0039] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0040] Although the terms such as pipe body 1, double hot-melt socket 11, pipe socket 12, annular inner step 13, annular groove 131, large tubular portion 14, small tubular portion 15, annular outer step 16, multi-layer composite pipe 2, connecting pipe 3, and metal bushing 4 are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A multi-layer composite pipe hot-melt socket joint, comprising a pipe body (1), characterized in that: One end of the pipe body (1) has a double hot-melt socket (11) arranged axially and for inserting the multi-layer composite pipe (2), and the other end of the pipe body (1) has a pipe socket (12) arranged axially and for sleeve-engaging the connecting pipe (3), the double hot-melt socket (11) and the pipe socket (12) are interconnected and coaxially arranged, the inner diameter of the double hot-melt socket (11) is larger than the inner diameter of the pipe socket (12), and an annular inner step (13) is provided between the double hot-melt socket (11) and the pipe socket (12).

2. A multi-layer composite pipe hot-melt socket fitting as claimed in claim 1, characterized in that: The pipe fitting body (1) comprises a coaxially arranged large tubular portion (14) and a small tubular portion (15), the outer diameter of the large tubular portion (14) being larger than the outer diameter of the small tubular portion (15), and an annular outer step (16) is formed between the circumferential outer side of one end of the large tubular portion (14) and the circumferential outer side of one end of the small tubular portion (15).

3. A multi-layer composite pipe hot-melt socket joint as claimed in claim 2, characterized in that: The pipe body (1) is made of thermoplastic plastic material, and the large tubular portion (14) and the small tubular portion (15) are integrally formed by injection molding.

4. A multi-layer composite pipe hot-melt socket joint as claimed in claim 2, characterized in that: The annular outer step (16) and the annular inner step (13) are arranged in a staggered manner, the annular outer step (16) is close to the pipe socket (12) side and the annular inner step (13) is close to the double hot melt socket (11) side.

5. A multi-layer composite pipe hot-melt socket fitting as claimed in claim 1 or 2 or 3 or 4, characterized in that: An annular groove (131) is provided on the annular inner step (13), and the annular groove (131) opens toward one end of the double hot-melt socket (11) away from the pipe socket (12).

6. A multi-layer composite pipe hot-melt socket joint as claimed in claim 2, characterized in that: The double hot-melt socket (11) is formed on the circumferential inner side of the large tubular portion (14), and the pipe socket (12) is formed on the circumferential inner side of the small tubular portion (15). One end of the small tubular portion (15) axially extends to the circumferential inner side of the large tubular portion (14) to form the above-mentioned annular inner step (13).

7. A multi-layer composite pipe hot-melt socket joint as claimed in claim 2, characterized in that: The connecting pipe (3) is sleeved on the small tubular portion (15) and one end of the connecting pipe (3) abuts against the annular outer step (16); the multi-layer composite pipe (2) is inserted into the large tubular portion (14) and one end of the multi-layer composite pipe (2) abuts against the annular inner step (13).

8. A multi-layer composite pipe hot-melt socket joint as claimed in claim 2, characterized in that: The inner diameter of the double hot-melt socket (11) is equal to the inner diameter of the connecting pipe (3) or the outer diameter of the small tubular portion (15).

9. A multi-layer composite pipe hot-melt socket joint as claimed in claim 1, characterized in that: A metal bushing (4) is provided on the inner side of one end of the pipe socket (12) close to the double hot-melt socket (11).

10. A multi-layer composite pipe hot-melt socket joint as claimed in claim 1, characterized in that: The material of the pipe body (1) is any one of PP-R, PB, PE or PE-RT.

Images