Novel steel-plastic conversion pipe joint

Abstract

The novel steel-plastic conversion pipe joint comprises a steel pipe, a plastic pipe and a connecting piece, the connecting piece is arranged at the joint of the steel pipe and the plastic pipe, a plurality of annular protrusions are fixedly connected to the outer wall of the connecting end of the steel pipe at equal intervals, and an annular groove is formed between every two adjacent annular protrusions. The outer wall of the connecting end of the steel pipe is sleeved with one end of the plastic pipe after being heated, the connecting piece is tubular, the inner wall of the connecting piece is fixedly connected with an extrusion ring corresponding to the annular groove, the extrusion ring can press the plastic pipe into the annular groove, and the inner diameter of the end, close to the steel pipe, of the connecting piece is equal to the outer diameter of the steel pipe. The inner diameter of one end of the connector close to the plastic pipe is equal to the outer diameter of the plastic pipe; the connecting piece is fixed on the annular protrusion on the steel pipe in a matched mode, so that the plastic pipe is pressed into the annular groove to be tightly connected with the steel pipe, the inner wall of the connecting piece is tightly contacted with the outer wall of the plastic pipe and the outer wall of the steel pipe, and it is guaranteed that the joint of the plastic pipe has good shear resistance.

Description

Technical Field

[0001] The utility model relates to the technical field of steel-plastic conversion pipe joints, in particular to a novel steel-plastic conversion pipe joint. Background Art

[0002] In the field of gas and other fluid transportation pipelines, commonly used pipes are usually metal pipes such as steel pipes and plastic pipes made of polyethylene. Metal pipes are generally used in medium- to high-pressure fluid transportation systems, while plastic pipes are generally used for low-pressure fluids. However, because plastic pipes are not UV-resistant, they are easily aged when exposed to UV rays. For safety reasons, relevant national engineering specifications stipulate that plastic pipes are not allowed to enter the end of the pipeline - the user's indoor space. Therefore, when transitioning from high-pressure to low-pressure pipelines, or when plastic pipes are piped from courtyards to homes, polyethylene steel-plastic conversion joints are often required.

[0003] Conventional steel-plastic conversion joints consist of two parts: a steel pipe end fitting and a plastic pipe end fitting. The steel pipe end fitting is equipped with a fixing groove. During connection, one end of the plastic pipe end fitting is inserted into the fixing groove. The steel pipe end fitting is then heated by a heating device. As the temperature rises, the plastic pipe melts. When the temperature reaches a predetermined value, the heating is stopped. When the plastic pipe solidifies again, it is tightly connected to the steel pipe end fitting. However, in actual use, because the plastic pipe end fitting is made of plastic, its hardness is much lower than that of the steel pipe end fitting. This makes it very easy for the steel-plastic conversion joint to break when subjected to shear or tensile forces.

[0004] Therefore, a new steel-plastic conversion pipe joint is proposed. Utility Model Content

[0005] The purpose of the present utility model is to provide a novel steel-plastic conversion pipe joint, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems existing in the prior art.

[0006] In order to achieve the above-mentioned purpose, the main technical solutions adopted by this utility model include:

[0007] A novel steel-plastic conversion pipe joint comprises a steel pipe, a plastic pipe and a connector. The connector is provided at the connection between the steel pipe and the plastic pipe. A plurality of annular protrusions are fixedly connected at equal intervals on the outer wall of the connecting end of the steel pipe, and an annular groove is formed between two adjacent annular protrusions. One end of the plastic pipe is heated and sleeved on the outer wall of the connecting end of the steel pipe.

[0008] The connecting piece is tubular, and an extrusion ring corresponding to the annular groove is fixedly connected to the inner wall of the connecting piece. The connection between the steel pipe and the plastic pipe is located inside the connecting piece, and the extrusion ring can press the heated plastic pipe into the annular groove.

[0009] The inner diameter of one end of the connecting piece close to the steel pipe is equal to the outer diameter of the steel pipe, and the inner diameter of one end of the connecting piece close to the plastic pipe is equal to the outer diameter of the plastic pipe.

[0010] In a novel steel-plastic conversion pipe joint according to the utility model, the connecting piece includes two semicircular tubes, both of which are provided with mounting holes, and the two semicircular tubes are fixedly connected by bolts.

[0011] In a new steel-plastic conversion pipe joint according to the utility model, a first limiting ring is fixedly connected to the outer wall of the connecting end of the steel pipe, a second limiting ring is molded on the plastic pipe, and annular grooves are provided on the inner walls of both ends of the connecting piece, and the first limiting ring and the second limiting ring are respectively clamped in the corresponding annular grooves.

[0012] In a novel steel-plastic conversion pipe joint according to the utility model, a slope is provided on a side of the annular protrusion close to the plastic pipe.

[0013] In a new steel-plastic conversion pipe joint according to the utility model, annular sealing grooves are provided on the second limiting ring and the first limiting ring, and sealing rings are sleeved in the two annular sealing grooves, and the outer wall of the sealing ring is in close contact with the inner wall of the annular groove.

[0014] In a novel steel-plastic conversion pipe joint according to the utility model, a rubber sealing block for sealing the bolt in the mounting hole is provided in the mounting hole.

[0015] The utility model has at least the following beneficial effects:

[0016] The utility model provides a connecting piece that cooperates with the annular protrusion fixed on the steel pipe, so that the plastic pipe can be pressed into the annular groove and tightly connected to the steel pipe. In addition, the inner wall of the connecting piece is in close contact with the outer walls of the plastic pipe and the steel pipe, thereby ensuring that the connection of the plastic pipe has good shear resistance.

[0017] The first limiting ring and the second limiting ring cooperate with the annular groove to further limit the position of the plastic tube, effectively improving the tensile strength of the plastic tube;

[0018] The sealing ring provided can perform secondary sealing on the connection between the steel pipe and the plastic pipe, thereby improving the sealing performance of the connection between the steel pipe and the plastic pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 This is a structural diagram of the steel-plastic conversion pipe joint of the utility model;

[0021] Figure 2 This is a schematic diagram of the exploded structure of the new steel-plastic conversion pipe joint of the utility model;

[0022] Figure 3 This is a structural diagram of the steel pipe of the steel-plastic conversion pipe joint of the utility model;

[0023] Figure 4 for Figure 2 A schematic diagram of the enlarged structure of part A in FIG;

[0024] Figure 5 This is a schematic diagram of the cross-sectional structure of the steel-plastic conversion pipe joint of the utility model.

[0025] Description of Figure Numbers:

[0026] 1. Steel pipe; 101. Limiting ring; 102. Annular sealing groove; 103. Annular protrusion; 104. Annular groove; 2. Plastic pipe; 3. Connector; 301. Semicircular pipe; 302. Annular groove; 303. Extrusion ring; 304. Mounting hole; 4. Sealing ring. DETAILED DESCRIPTION

[0027] The following will describe the implementation methods of the present application in detail with reference to the accompanying drawings and examples, so that the implementation process of how the present application applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0028] Please refer to Figures 1 to 5 As shown, the embodiment of the present utility model provides a new steel-plastic conversion pipe joint, comprising a steel pipe 1, a plastic pipe 2 and a connector 3. The connector 3 is arranged at the connection between the steel pipe 1 and the plastic pipe 2. A plurality of annular protrusions 103 are fixedly connected to the outer wall of the connecting end of the steel pipe 1 at equal intervals. An annular groove 104 is formed between two adjacent annular protrusions 103. One end of the plastic pipe 2 is heated and sleeved on the outer wall of the connecting end of the steel pipe 1.

[0029] The connecting piece 3 is arranged in a tubular shape and includes two semicircular tubes 301. The two semicircular tubes 301 are each provided with a mounting hole 304. The two semicircular tubes 301 are fixedly connected by bolts 305. The inner wall of the connecting piece 3 is fixedly connected with an extrusion ring 303 corresponding to the annular groove 104. The connection between the steel pipe 1 and the plastic pipe 2 is located inside the connecting piece 3. The extrusion ring 303 can press the heated plastic pipe 2 into the annular groove 104. The outer wall of the connecting end of the steel pipe 1 is fixedly connected with a first limiting ring 101. The plastic pipe 2 is formed with a second limiting ring 201. The inner walls of both ends of the connecting piece 3 are provided with annular grooves 302. The first limiting ring 101 and the second limiting ring 201 are respectively clamped in the corresponding annular grooves 302.

[0030] The inner diameter of the end of the connector 3 close to the steel pipe 1 is equal to the outer diameter of the steel pipe 1 , and the inner diameter of the end of the connector 3 close to the plastic pipe 2 is equal to the outer diameter of the plastic pipe 2 .

[0031] In order to facilitate the installation of the plastic pipe 2 on the steel pipe 1 , a slope is provided on the side of the annular protrusion 103 close to the plastic pipe 2 .

[0032] In this embodiment, in order to ensure the sealing of the connection between the steel pipe 1 and the plastic pipe 2, annular sealing grooves 102 are provided on the second limiting ring 201 and the first limiting ring 101, and sealing rings 4 are sleeved in the two annular sealing grooves 102. The outer wall of the sealing ring 4 is in close contact with the inner wall of the annular groove 302.

[0033] In this embodiment, a rubber sealing block is provided in the mounting hole 304 for sealing the bolt 305 in the mounting hole 304 . This arrangement can effectively prevent the bolt 305 from being corroded by the outside world, thereby increasing the service life of the bolt 305 .

[0034] In order to facilitate understanding of the above technical solutions of the present invention, the working principle or operation method of the present invention in actual process is described in detail below.

[0035] Working principle: When in use, the plastic tube 2 is heated and then put on the steel tube 1, and then the two semicircular tubes 301 are merged to form a connecting piece 3, and then the two semicircular tubes 301 are fixed together by bolts 305. As the two semicircular tubes 301 are fixed together, the extrusion ring 303 presses the plastic tube 2 into the annular groove 104 to ensure the connection strength between the plastic tube 2 and the steel tube 1, and at the same time, the first limiting ring 101 and the second limiting ring 201 are respectively clamped into the corresponding annular grooves 302.

[0036] The above description shows and describes several preferred embodiments of the present invention. However, as previously mentioned, it should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the present invention as taught herein or through the techniques or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A new type of steel-plastic conversion pipe joint, characterized in that: The invention comprises a steel pipe (1), a plastic pipe (2) and a connecting piece (3), wherein the connecting piece (3) is arranged at the connection between the steel pipe (1) and the plastic pipe (2), a plurality of annular protrusions (103) are fixedly connected at equal intervals to the outer wall of the connecting end of the steel pipe (1), an annular groove (104) is formed between two adjacent annular protrusions (103), and one end of the plastic pipe (2) is heated and then sleeved on the outer wall of the connecting end of the steel pipe (1); The connecting piece (3) is arranged in a tubular shape, and an extrusion ring (303) corresponding to the annular groove (104) is fixedly connected to the inner wall of the connecting piece (3); the connection point between the steel pipe (1) and the plastic pipe (2) is located inside the connecting piece (3), and the extrusion ring (303) can press the heated plastic pipe (2) into the annular groove (104); The inner diameter of the end of the connecting piece (3) close to the steel pipe (1) is equal to the outer diameter of the steel pipe (1), and the inner diameter of the end of the connecting piece (3) close to the plastic pipe (2) is equal to the outer diameter of the plastic pipe (2).

2. The novel steel-plastic conversion pipe joint according to claim 1 is characterized in that: The connecting member (3) comprises two semicircular tubes (301), each of which is provided with a mounting hole (304), and the two semicircular tubes (301) are fixedly connected by bolts (305).

3. The new steel-plastic conversion pipe joint according to claim 2 is characterized by: A first limiting ring (101) is fixedly connected to the outer wall of the connecting end of the steel pipe (1), a second limiting ring (201) is formed on the plastic pipe (2), and an annular clamping groove (302) is provided on the inner walls of both ends of the connecting member (3), and the first limiting ring (101) and the second limiting ring (201) are respectively clamped in the corresponding annular clamping groove (302).

4. The new steel-plastic conversion pipe joint according to claim 3 is characterized by: A slope is provided on one side of the annular protrusion (103) close to the plastic tube (2).

5. The new steel-plastic conversion pipe joint according to claim 4 is characterized in that: An annular sealing groove (102) is provided on both the second limiting ring (201) and the first limiting ring (101), and a sealing ring (4) is sleeved in the two annular sealing grooves (102), and the outer wall of the sealing ring (4) is in close contact with the inner wall of the annular groove (302).

6. The novel steel-plastic conversion pipe joint according to claim 2 is characterized in that: A rubber sealing block is provided in the mounting hole (304) for sealing the bolt (305) in the mounting hole (304).

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