Plastic-coated pipeline

Abstract

The utility model discloses a plastic-coated pipeline which comprises an adapting pipe (1) and an inserting pipe (2), one end of the adapting pipe (1) is provided with a bellmouth (1-1), and one end of the inserting pipe (2) is provided with an inserting opening (2-1). The spigot (2-1) is inserted into the bell mouth (1-1) and is sealed through a sealing ring (3) in a matched manner; the steel pipe joint is characterized in that a reinforcing ring (4) is welded and fixed between the end edge of the bell mouth (1-1) and the outer wall surface of the spigot (2-1). The anti-deformation strength and the sealing performance of the connecting position of the bellmouth and the spigot can be multiplied, meanwhile, the connecting structure can be suitable for special scenes such as ultrahigh pressure, and meanwhile the connecting structure has the advantages of being easy to construct, low in cost, long in service life and the like.

Description

Technical Field

[0001] The utility model relates to a plastic - coated pipe. Background Art

[0002] The plastic - coated steel pipe, also known as plastic - coated pipe, steel - plastic composite pipe, plastic - coated composite steel pipe, is a steel - plastic composite steel pipe with a steel pipe as the base body, and a plastic anti - corrosion layer is welded on the inner surface of the steel pipe (base pipe) by spraying, rolling, dipping, or suction process, or plastic anti - corrosion layers are welded on both the inner and outer wall surfaces. The plastic - coated steel pipe has excellent corrosion resistance and relatively small frictional resistance, and can be applied to the transportation of media such as drainage, seawater, oil, and gas.

[0003] When the traditional socket - and - spigot plastic - coated steel pipe (such as referring to CN204573388U) is in use, its spigot is inserted into the socket and sealed by a sealing ring. Compared with the present application, the existing technology has the following deficiencies and the analysis is as follows:

[0004] (1). Due to relying only on the sealing effect of the sealing ring, and the problem that the sealing ring will age and have a short service life. When corrosive media are transported in the plastic - coated steel pipe, the sealing performance of the sealing ring will be reduced, and leakage problems are likely to occur; especially, it cannot meet the requirements for transporting gas or liquid under high - pressure or ultra - high - pressure conditions, and at the same time, it cannot be applied to special environments such as vibration.

[0005] (2). Since the spigot and the socket are not fully fixed, when the foundation subsides, especially at the edge of the socket, it is subjected to huge extrusion forces (similar to lever forces). And the edge of the socket is not strengthened and relies on the basic thickness, resulting in serious insufficient strength and being extruded and deformed, and poor fit, thus generating leakage problems. Summary of the Utility Model

[0006] The utility model provides a plastic - coated pipe, which can solve one or more of the technical problems raised in the above - mentioned background art.

[0007] To achieve the above purpose, the solution of the utility model is: a plastic - coated pipe, including a receiving pipe and an inserting pipe. One end of the receiving pipe has a socket, and one end of the inserting pipe has a spigot; the spigot is inserted into the socket and sealed by the cooperation of a sealing ring; its feature is that a reinforcing ring is fixedly welded between the edge of the socket and the outer wall surface of the spigot.

[0008] Further, between one side surface of the reinforcing ring, the outer wall surface of the spigot and the end - face of the edge of the socket, it is fixedly welded by full - circumferential welding for the first time; between the other side surface of the reinforcing ring and the outer wall surface of the edge of the socket, it is fixedly welded by full - circumferential welding for the second time.

[0009] Further, the cross - section of the reinforcing ring is circular.

[0010] Furthermore, the inner wall of the socket has a first sealing ring groove and a second sealing ring groove; the sealing ring has a first convex portion for cooperating with the first sealing ring groove and a second convex portion for cooperating with the second sealing ring groove.

[0011] Furthermore, the reinforcement ring is made of stainless steel.

[0012] Furthermore, the inner and outer wall surfaces of the receiving tube, the inner and outer wall surfaces of the plug tube and the reinforcement ring are all provided with an anti-corrosion plastic layer.

[0013] Furthermore, the anti-corrosion plastic layer has a thickness of 0.5-1 mm.

[0014] Furthermore, the anti-corrosion plastic layer is made of polyethylene material.

[0015] Beneficial effects of the utility model:

[0016] First, the utility model has a reinforcement ring welded and fixed between the end edge of the socket and the outer wall of the socket, and the reinforcement ring thickens and reinforces the edge of the socket, which doubles the anti-deformation strength, and can solve the leakage problem caused by insufficient anti-deformation strength and poor matching at the edge of the socket in the prior art;

[0017] Second, the utility model has a reinforcement ring welded and fixed between the end edge of the socket and the outer wall of the socket, and the reinforcement ring is welded to the end edge of the socket and the outer wall of the socket to form a circumferential seal, which can withstand special environments or working conditions such as high pressure or vibration;

[0018] Third, the utility model has a first sealing ring groove and a second sealing ring groove on the inner wall of the socket; the sealing ring has a first convex portion for cooperating with the first sealing ring groove and a second convex portion for cooperating with the second sealing ring groove, which is similar to a wave double-peak concave-convex matching seal, which can improve the sealing effect and avoid the problem that the sealing ring is deformed and loosened by high pressure extrusion, thereby affecting the sealing performance;

[0019] Third, the utility model is fixed by a first circumferential full weld between the wall surface on one side (i.e. the right side) of the reinforcement ring, the outer wall surface of the socket and the end surface of the socket end edge; the wall surface on the other side (i.e. the left side) of the reinforcement ring and the outer wall surface of the socket end edge are fixed by a second circumferential full weld. The reinforcement ring is fixed by bilateral circumferential full welds, which can improve the welding strength, thereby improving the overall connection strength, and the construction is also simple;

[0020] Fourth, the utility model has a simple structure and can multiply the deformation resistance and sealing performance of the socket and spigot connection. At the same time, it can be used in special scenarios such as corrosion resistance and high pressure. It has the advantages of wide application range, simple construction, low cost and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of a plastic-coated pipe in the present utility model.

[0022] Figure 2 is Figure 1 Place the figure at position A in

[0023] Figure 3 It is a physical picture of a plastic-coated pipe in the present utility model. Specific implementation manner

[0024] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments:

[0025] Embodiment: Refer to Figures 1-3 , a plastic-coated pipe, including a receiving pipe 1 and an inserting pipe 2. One end of the receiving pipe 1 has a socket 1-1, and one end of the inserting pipe 2 has a spigot 2-1; the spigot 2-1 is inserted into the socket 1-1 and sealed by cooperation with a sealing ring 3.

[0026] In addition, a reinforcing ring 4 is fixedly welded between the end edge of the socket 1-1 and the outer wall surface of the spigot 2-1.

[0027] In this embodiment, the cross-section of the reinforcing ring 4 is circular. Preferably, the reinforcing ring 4 is made of stainless steel.

[0028] In this embodiment, between the side wall surface (i.e., the right side) of the reinforcing ring 4, the outer wall surface of the spigot 2-1 and the end face of the end edge of the socket 1-1, it is fixed by a first circumferential full weld 5-1; between the other side wall surface (i.e., the left side) of the reinforcing ring 4 and the outer wall surface of the end edge of the socket 1-1, it is fixed by a second circumferential full weld 5-2.

[0029] In this embodiment, the inner wall of the socket 1-1 has a first sealing ring groove 1-11 and a second sealing ring groove 1-12; the sealing ring 3 has a first convex portion 3-1 for cooperating with the first sealing ring groove 1-11 and a second convex portion 3-2 for cooperating with the second sealing ring groove 1-12.

[0030] Preferably, the diameter size of the reinforcing ring 4 is 2-3 times the thickness of the socket 1-1.

[0031] In this embodiment, anti-corrosion plastic layers are provided on the inner and outer wall surfaces of the receiving pipe 1, the inner and outer wall surfaces of the inserting pipe 2, and the reinforcing ring 4.

[0032] In this embodiment, the thickness of the anti-corrosion plastic layer is 0.5-1 mm.

[0033] In this embodiment, the anti-corrosion plastic layer is made of polyethylene material. The anti-corrosion plastic layer made of polyethylene has good corrosion resistance, can effectively resist the corrosion of chemical substances such as acids, alkalis, and salts, can be used in harsh environments, also has strong wear resistance, can effectively resist mechanical wear and thermal stress, can maintain good performance for a long time, and has a long service life.

[0034] In the construction of this embodiment, first, the sealing ring 3 is installed into the socket 1-1, and the reinforcing ring 4 is pre-sleeved at the edge of the socket 1-1; then the spigot 2-1 is inserted into the socket 1-1 until it reaches the position, and finally, the two sides of the reinforcing ring 4 are welded circumferentially. The connection of this coated pipe is very simple, convenient for on-site construction, with low engineering costs, and is suitable for popularization.

[0035] This embodiment has the following characteristics and the analysis is as follows:

[0036] First, in this embodiment, since a reinforcing ring 4 is fixedly welded between the edge of the socket 1-1 and the outer wall surface of the spigot 2-1, and the reinforcing ring 4 thickens and strengthens the edge of the socket 1-1, doubling (2-3 times) the anti-deformation strength, it can solve the leakage problem caused by insufficient anti-deformation strength and poor fit at the edge of the socket 1-1 in the prior art;

[0037] Second, in this embodiment, since a reinforcing ring 4 is fixedly welded between the edge of the socket 1-1 and the outer wall surface of the spigot 2-1, and the reinforcing ring 4 forms a circumferential seal by welding with both the edge of the socket 1-1 and the outer wall surface of the spigot 2-1 at the same time, it can be used under special environments or working conditions such as high pressure or vibration;

[0038] Third, in this embodiment, since the inner wall of the socket 1-1 has a first sealing ring groove 1-11 and a second sealing ring groove 1-12; the sealing ring 3 has a first convex portion 3-1 for cooperating with the first sealing ring groove 1-11 and a second convex portion 3-2 for cooperating with the second sealing ring groove 1-12, similar to a wave-shaped double-peak concave-convex fit for sealing, which can improve the sealing effect and avoid the problem that the sealing ring 3 is deformed and loosened by high pressure, affecting the sealing performance;

[0039] Third, in this embodiment, since the first circumferential full weld 5-1 is used to fix between the side wall (i.e., the right side) of the reinforcing ring 4, the outer wall surface of the spigot 2-1 and the end face of the edge of the socket 1-1; the second circumferential full weld 5-2 is used to fix between the other side wall (i.e., the left side) of the reinforcing ring 4 and the outer wall surface of the edge of the socket 1-1, and the reinforcing ring 4 is fixedly welded by double-sided circumferential full weld, which can improve the welding strength, thereby improving the overall connection strength, and the construction is also simple;

[0040] Fourth, the structure of this embodiment is simple, and it can double the anti-deformation strength and sealing performance at the joint between the socket and the spigot. At the same time, it is applicable to special scenarios such as corrosion resistance and high pressure; it has the advantages of wide application range, simple construction, low cost, and long service life.

[0041] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field according to the concept of the present invention through logical analysis, reasoning, or limited experiments on the basis of the prior art shall fall within the protection scope determined by the claims.

Claims

1. A plastic-coated pipe, comprising a receiving pipe (1) and a plug-in pipe (2), wherein one end of the receiving pipe (1) has a socket (1-1), and one end of the plug-in pipe (2) has a plug-in opening (2-1); the plug-in opening (2-1) is inserted into the receiving pipe (1-1) and is sealed by a sealing ring (3); the characteristics are: A reinforcement ring (4) is welded and fixed between the end edge of the socket (1-1) and the outer wall surface of the insert (2-1).

2. A plastic-coated pipe according to claim 1, characterized in that: A side surface of the reinforcement ring (4), an outer wall surface of the socket (2-1) and an end surface of the socket (1-1) are fixed by a first circumferential full weld (5-1); The other side surface of the reinforcement ring (4) and the outer wall surface of the end edge of the socket (1-1) are fixed by a second circumferential full weld (5-2).

3. A plastic-coated pipe according to claim 1 or 2, characterized in that: The reinforcement ring (4) has a circular cross section.

4. The plastic-coated pipe according to claim 1, characterized in that: The inner wall of the socket (1-1) comprises a first sealing ring groove (1-11) and a second sealing ring groove (1-12); The sealing ring (3) comprises a first convex portion (3-1) for cooperating with a first sealing ring groove (1-11) and a second convex portion (3-2) for cooperating with a second sealing ring groove (1-12).

5. The plastic-coated pipe according to claim 1, characterized in that: The reinforcement ring (4) is made of stainless steel.

6. The plastic-coated pipe according to claim 1, characterized in that: The inner and outer wall surfaces of the receiving tube (1), the inner and outer wall surfaces of the plug tube (2) and the reinforcement ring (4) are all provided with an anti-corrosion plastic layer.

7. A plastic-coated pipe according to claim 6, characterized in that: The anti-corrosion plastic layer has a thickness of 0.5-1 mm.

8. A plastic-coated pipe according to claim 6 or 7, characterized in that: The anti-corrosion plastic layer is made of polyethylene material.

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