PSP steel-plastic pipe connecting structure

Abstract

The utility model discloses a PSP steel-plastic pipe connecting structure. A steel-plastic pipe body is composed of a pipe body outer pipe, a pipe body steel pipe and a pipe body inner pipe. The pipe body joint comprises at least two groups of connecting pipe bodies, and each connecting pipe body comprises a communicating inner pipe and a connecting outer pipe which is concentric with the communicating inner pipe; the communicating inner pipe and the connecting outer pipe are in clearance fit to form a connecting pipe groove, and the steel-plastic pipe body is in transition fit with the groove wall of the connecting pipe groove. A connector steel pipe is arranged on the inner end face of the communicating inner pipe; a pressure retaining ring is nested on the outer layer of the connecting outer pipe; through the mode that the pressure retaining ring made of ceramic materials is arranged outside the pipe body connector and is matched with the pipe body steel pipe and the connector steel pipe structure, guiding work in the hot melting expansion direction of the steel-plastic pipe body and the pipe body connector is achieved, hot melting expansion can be conducted between the connected pipe walls in the opposite direction, and the tight matching effect is achieved; the connecting strength is remarkably improved, and the defects that in the prior art, gaps and water leakage are prone to occurring, looseness is prone to occurring, and the false melting integrated phenomenon occurs are overcome.

Description

Technical Field

[0001] The utility model belongs to the technical field of PSP steel-plastic pipes, and relates to a connection structure of PSP steel-plastic pipes. Background Art

[0002] PSP steel-plastic pipes are formed by rolling galvanized steel strips and butt-welding them with argon arc welding. After applying a special hot-melt agent to the inner and outer layers, a plastic layer is then covered on the surface. PSP steel-plastic pipes overcome the defects of steel pipes such as easy rusting and heavy weight, and the defects of plastic pipes such as low strength and easy expansion and deformation. They have the advantages of good oxygen isolation, high stiffness and strength. PSP steel-plastic pipes inherit the advantages of metal pipes and plastic pipes and overcome their respective disadvantages, and are a new type of pipe with a very wide application prospect.

[0003] The traditional connection method between PSP steel-plastic pipes mainly connects the PSP steel-plastic pipe and the pipe joint together by hot-melting; however, when the traditional PSP steel-plastic pipe and the pipe joint are performing hot-melting work, the hot-melt expansion direction of the plastic pipe body is not fixed, resulting in the inability to guarantee the hot-melt tightness between the pipe body and the joint, causing defects such as insufficient connection strength and gaps. In severe cases, it may even lead to low peel strength of the socket and spigot, or even looseness, and large-area water leakage. Content of the Utility Model

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A connection structure of PSP steel-plastic pipes, comprising: a steel-plastic pipe body and a pipe joint for realizing the connection between pipe bodies;

[0006] The steel-plastic pipe body is composed of, from outside to inside in sequence: an outer pipe of the pipe body, a steel pipe of the pipe body, and an inner pipe of the pipe body;

[0007] The pipe joint includes at least two groups of connecting pipe bodies connected to the steel-plastic pipe body. Each connecting pipe body is a double-pipe body structure, which includes: a communicating inner pipe and a connecting outer pipe concentrically arranged with the communicating inner pipe. The communicating inner pipes of each connecting pipe body are interconnected;

[0008] A connecting pipe groove is formed by clearance fit between the communicating inner pipe and the connecting outer pipe. The steel-plastic pipe body can be inserted into the connecting pipe groove, and the steel-plastic pipe body and the groove wall of the connecting pipe groove are in transition fit;

[0009] A joint steel pipe is arranged at the inner end face of the communicating inner pipe; and a pressure-holding ring is nested on the outer layer of the connecting outer pipe;

[0010] The outer pipe of the pipe body, the inner pipe of the pipe body in the steel-plastic pipe body, the communicating inner pipe and the connecting outer pipe in the connecting pipe body are all made of plastic material;

[0011] The pipe body steel pipe and the joint steel pipe are both made of metal materials;

[0012] The pressure-holding ring is made of a material with a coefficient of thermal expansion less than that of the connecting outer pipe.

[0013] As a further solution of the present utility model: The pressure-holding ring is made of one of ceramic materials or nylon materials.

[0014] As a further solution of the present utility model: A guiding sliding surface inclined towards the connecting pipe groove is formed along the inner end surface of the connecting outer pipe.

[0015] As a further solution of the present utility model: The connecting pipe groove is a deep groove structure, and the end surface of the steel-plastic pipe body inserted into the connecting pipe groove abuts against the bottom of the connecting pipe groove.

[0016] The beneficial effects of the present utility model: By setting a pressure-holding ring made of ceramic material outside the pipe body joint, and cooperating with the pipe body steel pipe and the joint steel pipe structures, the guiding work of the hot-melt expansion direction of the steel-plastic pipe body and the pipe body joint is realized, so that the adjacent pipe walls can perform hot-melt expansion in opposite directions, achieving the effect of tight fit, significantly improving the connection strength, and overcoming the defects of the prior art such as easy occurrence of gaps, water leakage, easy loosening, and false melting into one body. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the present utility model.

[0018] Figure 2 It is a schematic structural diagram of the steel-plastic pipe body in the present utility model.

[0019] Figure 3 It is a schematic structural diagram of the pipe body joint in the present utility model. Detailed Embodiments

[0020] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. It should be understood that the present application is not limited by the example embodiments described herein. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0021] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0023] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] The present utility model provides for reference Figures 1 to 3 , in the embodiments of the present utility model, a PSP steel-plastic pipe connection structure includes: a steel-plastic pipe body 1 and a pipe body joint 2. When the steel-plastic pipe body 1 is in use, the connection between the pipe bodies is realized through the pipe body joint 2;

[0025] The steel-plastic pipe body 1 is designed with a three-layer structure, which includes, from outside to inside in sequence: an outer pipe 12 of the pipe body, a steel pipe 13 of the pipe body, and an inner pipe 11 of the pipe body;

[0026] The pipe body joint 2 includes at least two sets of connecting pipe bodies 21 connected to the steel-plastic pipe body 1. Each connecting pipe body 21 has a double-pipe body structure, which includes: a communicating inner pipe 211 and a connecting outer pipe 214 concentrically arranged with the communicating inner pipe 211. The communicating inner pipes 211 of each connecting pipe body 21 are interconnected;

[0027] A clearance fit is formed between the communicating inner pipe 211 and the connecting outer pipe 214 to form a connecting pipe groove 212. The connection between the steel-plastic pipe body 1 and the connecting pipe body 21 is realized by inserting the steel-plastic pipe body 1 into the connecting pipe groove 212, and a transition fit is adopted between the steel-plastic pipe body 1 and the groove wall of the connecting pipe groove 212.

[0028] The inner end face of the communicating inner pipe 211 is provided with a joint steel pipe 211; and a pressure-holding ring 216 is nested outside the connecting outer pipe 214.

[0029] During processing, the outside of the connecting outer pipe 214 is heated by an external heating device to cause the connecting outer pipe 214 and the steel-plastic pipe body 1 installed at this position to expand due to heat.

[0030] Among them: the outer pipe 12 of the pipe body, the inner pipe 11 of the pipe body and the communicating inner pipe 211 and the connecting outer pipe 214 in the pipe body joint 2 in the steel-plastic pipe body 1 are all made of plastic material;

[0031] The pipe body steel pipe 13 and the joint steel pipe 211 are both made of metal material;

[0032] The pressure-holding ring 216 is made of a material with a coefficient of thermal expansion less than that of the connecting outer pipe 214, and can achieve the effects of changing the pressure direction and changing the flow direction of the plastic after thermal expansion.

[0033] When heated, due to the limitation of the pipe body steel pipe 13, the outer pipe 12 of the pipe body and the inner pipe 11 of the pipe body will expand by hot melting outward from the connecting pipe groove 212; similarly, due to the limitation of the joint steel pipe 211 and the pressure-holding ring 216, the communicating inner pipe 211 and the connecting outer pipe 214 will expand by hot melting toward the center direction of the connecting pipe groove 212, so that the steel-plastic pipe body 1 and the groove wall of the connecting pipe groove 212 can be fully melted into one body to achieve a tight connection.

[0034] Preferably, the pressure-holding ring 216 is made of one of ceramic material or nylon material, and has the technical characteristics of high melting point, high hardness, high wear resistance and oxidation resistance. Compared with metal materials, it is more suitable as the outer pipe structure of the pipe body joint 2.

[0035] Furthermore, a guiding sliding surface 213 inclined toward the connecting pipe groove 212 is formed on the inner end face of the connecting outer pipe 214. When the steel-plastic pipe body 1 is inserted into the connecting pipe groove 212, the guiding sliding surface 213 is used to realize the plugging guiding work.

[0036] Furthermore, the connecting pipe groove 212 is a deep groove structure, and the end face of the steel-plastic pipe body 1 inserted into the connecting pipe groove 212 abuts against the groove bottom of the connecting pipe groove 212. This structure can effectively increase the contact area between the steel-plastic pipe body 1 and the connecting pipe body 21, and at the same time can realize the axial limit work of the steel-plastic pipe body 1.

[0037] It should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0038] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A PSP steel-plastic pipe connection structure, characterized in that: include: A steel-plastic pipe body and a pipe body joint for connecting the pipe bodies; The steel-plastic pipe body is composed of: an outer pipe, a pipe body steel pipe and an inner pipe, which are arranged in sequence from the outside to the inside; The pipe body joint includes at least two groups of connecting pipe bodies connected to the steel-plastic pipe body, each connecting pipe body is a double-tube structure, which includes: a connecting inner pipe and a connecting outer pipe concentrically arranged with the connecting inner pipe, and the connecting inner pipes of each connecting pipe body are connected to each other; The gap between the connecting inner pipe and the connecting outer pipe is matched to form a connecting pipe groove, the steel-plastic pipe body can be inserted into the connecting pipe groove, and the steel-plastic pipe body and the groove wall of the connecting pipe groove are transitionally matched; A joint steel pipe is arranged on the inner end surface of the inner tube; and a pressure retaining ring is embedded in the outer layer of the outer tube; The outer tube of the steel-plastic pipe body, the inner tube of the pipe body, and the connecting inner tube and the connecting outer tube of the connecting pipe body are all made of plastic material; The pipe body steel pipe and the joint steel pipe are made of metal materials; The pressure retaining ring is made of a material having a thermal expansion coefficient smaller than that of the connected outer tube.

2. A PSP steel-plastic pipe connection structure according to claim 1, characterized in that: The pressure retaining ring is made of ceramic material or nylon material.

3. A PSP steel-plastic pipe connection structure according to claim 1, characterized in that: A guide sliding surface inclined toward the connecting pipe groove is formed on the upper edge of the inner end surface of the connecting outer pipe.

4. A PSP steel-plastic pipe connection structure according to claim 1, characterized in that: The connecting pipe groove is a deep groove structure, and the end surface of the steel-plastic pipe body inserted into the connecting pipe groove abuts against the groove bottom of the connecting pipe groove.

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