CN112050003A - Composite pipe double seal double socket structure and composite pipe - Google Patents

Abstract

The invention discloses a double-sealing double-socket structure of a composite pipe, which comprises an outer pipe socket structure and an inner pipe socket structure arranged in the outer pipe socket structure, wherein the outer pipe socket structure comprises an outer pipe socket section and an outer pipe socket section which are spliced together; the inner pipe socket structure comprises an inner pipe socket section and an inner pipe socket section which are connected together in an inserting mode, an inner pipe sealing structure and an inner pipe connecting structure capable of limiting the separation of the inner pipe socket section and the inner pipe socket section are arranged between the inner side wall of the inner pipe socket section and the outer side wall of the inner pipe socket section. The double-sealing double-socket structure of the composite pipe comprises a two-layer connecting structure and a two-layer sealing structure, and is high in connecting strength and good in sealing performance.

Description

Composite pipe double seal double socket structure and composite pipe

technical field

The invention relates to a double-seal double-socket-insertion structure of a composite pipe and a composite pipe.

Background technique

In order to ensure the strength of the pipeline and improve the anti-corrosion performance at the same time, the composite pipe came into being. Steel-plastic composite pipe is the most common type of composite pipe, which is widely used in various projects such as water supply and drainage to provide convenience for people's lives.

The common steel-plastic composite pipe generally has the following structure, including a steel outer pipe and a polymer inner pipe arranged in the outer pipe. In order to adapt to geological subsidence, sockets and sockets will be set at both ends of the outer pipe, leaving a gap between the sockets and sockets so that the connected pipes can rotate relative to a certain angle. In order to avoid the occurrence of geological subsidence, the inner pipe To cause damage, the inner tube is designed to be shorter than the outer tube. When two composite tubes are connected together, only the outer tubes are connected, and the inner tubes of the two composite tubes do not touch each other.

The socket structure of such a steel-plastic composite pipe has the following problems: first, only two outer pipes are connected together, and there is a gap between the two, and the connection strength is low; second, between the inner pipes of the two composite pipes For the open structure, the water in the composite pipe will contact the inner wall of the outer pipe, causing the socket and socket of the outer pipe to easily corrode and rust; third, only rely on the O-ring between the two outer pipes for sealing, and geological settlement occurs. When the two outer tubes are connected together, the relative positions of the two outer tubes change, resulting in a change in the depth of the sealing groove provided between the two outer tubes, the sealing groove on one side of the outer tube becomes deeper, and the other The sealing groove on one side becomes shallower, and the volume of the O-ring set in the sealing groove does not increase, resulting in a gap between the sealing groove and the O-ring, which leads to leakage and poor sealing performance; Fourth, the flange structure is generally used to connect the two composite pipes together, which is cumbersome and time-consuming to install and has low work efficiency.

SUMMARY OF THE INVENTION

In view of this, one of the objectives of the present invention is to provide a double-seal double-socket structure for a composite pipe, which includes a two-layer connection structure and a two-layer sealing structure, with high connection strength and good sealing performance.

The second object of the present invention is to provide a composite pipe, which can form the above-mentioned double-sealing double-socket structure of the composite pipe when one end and the other end are connected together.

The technical scheme that the present invention takes for realizing its purpose is as follows:

A double-sealed double-socket-insertion structure of a composite pipe comprises: an outer-pipe-socket-insertion structure and an inner-pipe-socket-insert structure arranged in the outer-pipe-socket-insert structure,

The outer tube socket structure includes an outer tube socket section and an outer tube socket section that are plugged together, an outer tube sealing structure is arranged between the outer tube socket section and the outer tube socket section, and the outer tube socket section is provided with an outer tube sealing structure. The outer side wall of the pipe socket section is provided with an outer pipe socket connection part, the inner side wall of the outer pipe socket section is provided with an outer pipe socket connection part, and the outer pipe socket connection part is matched and connected with the outer pipe socket connection part , so that the outer tube socket section and the outer tube socket section can rotate relative to each other and can limit the separation of the two after the outer tube socket section and the outer tube socket section are relatively rotated;

The inner tube socket structure includes an inner tube socket section and an inner tube socket section that are plugged together, and an inner tube seal is provided between the inner wall of the inner tube socket section and the outer wall of the inner tube socket section. The structure and the inner pipe connection structure can limit the separation of the inner pipe socket section and the inner pipe socket section.

In a preferred solution of the present invention, the right end of the outer tube socket section is open, and the outer tube socket section is inserted into the outer tube socket section through the right port of the outer tube socket section, and the outer tube socket section The inner side wall of the outer tube socket section is provided with a first spherical concave surface located on the right side of the outer tube socket connecting portion, and the outer side wall of the outer tube socket section is provided with a first spherical convex surface that fits with the first spherical concave surface.

In a preferred solution of the present invention, the outer tube sealing structure is arranged between the first spherical concave surface and the first spherical convex surface.

In a preferred solution of the present invention, the outer tube sealing structure includes a first sealing ring fixedly arranged on the socket section of the outer tube, and the outer surface of the first sealing ring is the same as that of the first spherical The convex surface is a spherical convex surface with a spherical center, and the outer surface of the first sealing ring slightly protrudes from the first spherical convex surface and is in interference fit with the first spherical concave surface.

In a preferred solution of the present invention, the material of the first sealing ring is rubber, polytetrafluoroethylene, graphite or sealant.

In a preferred solution of the present invention, a first flat wall section lower than the first spherical convex surface is provided on the outer side wall of the outer tube socket section, and the first flat wall section and the first spherical convex surface are arranged between the first flat wall section and the first spherical convex surface. A step is formed, the first sealing ring is sleeved on the first flat wall section, and the first flat wall section is also sleeved with a pressing plate capable of pressing the first sealing ring on the step, The pressing plate is screwed with the socket section of the outer tube.

In a preferred solution of the present invention, a first flat wall section lower than the first spherical convex surface is provided on the outer side wall of the outer tube socket section, and the first flat wall section and the first spherical convex surface are arranged between the first flat wall section and the first spherical convex surface. A step is formed, the first sealing ring is sleeved on the first flat wall section, and is bonded and fixed with the step.

In a preferred solution of the present invention, the outer pipe socket connection part includes a plurality of socket inverted teeth arranged around the inner side wall of the outer pipe socket section, and between every two adjacent socket inverted teeth A tooth slot is formed, and the left side wall of the tooth slot is provided with a second spherical concave surface with the same spherical center as the first spherical concave surface. The socket inverted teeth of the wall, the left side wall of the socket inverted teeth is provided with a second spherical convex surface that fits with the second spherical concave surface, the right side wall of the socket inverted teeth and the right side wall of the tooth slot are provided. There is space reserved for the rotation of the outer tube socket section relative to the outer tube socket section. When the outer tube socket section is rotated relative to the outer tube socket section, the inverted teeth of the socket are engaged with the tooth grooves. In order to limit the separation of the outer tube socket section and the outer tube socket section.

In a preferred solution of the present invention, the addendum diameter of each socket inverted tooth is smaller than the addendum diameter of the corresponding socket inverted tooth.

In a preferred solution of the present invention, the inner side wall of the inner pipe socket section is provided with a third spherical concave surface that has the same spherical center as the first spherical concave surface, and the outer side wall of the inner pipe socket section is provided with a third spherical concave surface. A third spherical convex surface that fits with the third spherical concave surface.

In a preferred solution of the present invention, the inner tube sealing structure includes a sealing groove disposed on the third spherical convex surface, and a third spherical concave surface disposed in the sealing groove and pressed by the third spherical concave surface. Two sealing rings.

In a preferred solution of the present invention, the inner pipe connecting structure includes an annular groove arranged on the inner side wall of the inner pipe socket section and an annular protrusion arranged on the outer side wall of the inner pipe socket section. An annular protrusion is snapped into a corresponding annular groove with a gap therebetween.

In a preferred solution of the present invention, the socket section of the inner tube is arranged inside the socket section of the outer tube, and the socket section of the inner tube is arranged inside the socket section of the outer tube.

In a preferred solution of the present invention, the left inner wall of at least one annular groove is provided with a fourth spherical concave surface with the same spherical center as the first spherical concave surface, and the left side wall of the annular protrusion is provided with For the fourth spherical convex surface that fits with the fourth spherical concave surface, the gap is provided between the right side wall of the annular protrusion and the right inner wall of the annular groove.

In a preferred solution of the present invention, the left end of the outer side wall of the inner tube socket section is provided with a second flat wall section, and the inner wall of the inner tube socket section is provided with a third flat wall section corresponding to the third flat wall section. There are three flat wall sections, and a gap is left between the second flat wall section and the third flat wall section.

In a preferred solution of the present invention, the inner tube socket section is arranged inside the outer tube socket section, and the inner tube socket section is arranged inside the outer tube socket section.

In a preferred solution of the present invention, a socket step is provided on the outer side wall of the socket section of the inner tube, and a fifth spherical concave surface that has the same spherical center as the first spherical concave surface is provided on the socket step, The left end surface of the inner pipe socket section is provided with a fifth spherical convex surface that fits with the fifth spherical concave surface.

A composite pipe, comprising an outer pipe and an inner pipe arranged in the outer pipe, one end of the outer pipe is provided with the outer pipe socket section of the double-sealed double-socket-insertion structure of the composite pipe as described above, so the The other end of the outer pipe is provided with the outer pipe socket section of the composite pipe double seal double socket structure as described above, and one end of the inner pipe is provided with the composite pipe double seal double socket structure as described above. The mouth section, the other end of the inner tube is provided with the inner tube socket section of the double-seal double-socket structure of the composite tube as described above.

The beneficial effects of the present invention are:

First, in the present invention, after the two composite pipes are socketed together, the inner pipe connection structure can limit the separation of the two composite pipes without geological settlement. At the same time, the inner pipe sealing structure and the outer pipe sealing structure can To ensure the sealing of the inner tube socket structure, to avoid the water in the tube contacting the outer tube and cause the outer tube to be corroded.

Second, the socket connection part of the outer pipe adopts socket inverted teeth, and the outer pipe socket connection part adopts socket inverted teeth. It only needs to insert the outer pipe socket section and the outer pipe socket section together, and at the same time connect the inner pipe socket section. The installation can be completed by plugging with the socket section of the inner pipe, which is convenient and quick; when geological subsidence occurs, the two composite pipes rotate relative to each other, and the inverted teeth of the socket are engaged with the grooves of the inverted teeth of the socket, which can further improve the connection strength and avoid the The pressure of the geological subsidence caused the two composite pipes to detach.

Third, the first spherical concave surface and the first spherical convex surface can play the role of determining the center of rotation. When geological subsidence occurs, the outer pipe socket section and the outer pipe socket section rotate relative to the center of the sphere P, and the first spherical concave surface The first sealing ring and the first spherical concave surface are always in close contact with the first spherical convex surface, and the sealing performance is good and the connection strength is high.

Fourth, the inner tube sealing structure adopts a sealing groove arranged on the third spherical convex surface, and a second sealing ring arranged in the sealing groove and pressed by the third spherical concave surface. When the geological subsidence occurs and the pipe joint is bent, the inner pipe socket section and the inner pipe socket section also rotate around the spherical center point P, and the third spherical concave surface and the third spherical convex surface rotate and slip relative to each other by a small distance. During this process, the distance between the third spherical concave surface and the bottom surface of the sealing groove remains unchanged, and the second sealing ring is kept in a pressed state, which can always maintain excellent sealing performance.

Description of drawings

Fig. 1 is the structural representation of the composite pipe in the embodiment 1 of the present invention;

Fig. 2 is the structural representation of the double-seal double-socket structure of the composite pipe in Example 1 of the present invention;

Fig. 3 is the structural representation of one end of the composite pipe of Example 1 of the present invention;

Fig. 4 is the structural representation of the other end of the composite pipe of Example 1 of the present invention;

Fig. 5 is a partial enlarged view of part A in Fig. 2;

Fig. 6 is the schematic diagram of the inner pipe connection structure in the embodiment 2 of the present invention;

Fig. 7 is the schematic diagram of the inner pipe connection structure in the embodiment 3 of the present invention;

8 is a schematic diagram of the inner tube socket-insertion structure in Embodiment 4 of the present invention;

FIG. 9 is a partial enlarged view of part B in FIG. 8 .

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

It should be noted that all directional indications (such as up, down, left, right, front, rear...) in the embodiments of the present invention are only used to explain the relative relationship between various components in a certain posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the descriptions involving "preferred", "less preferred", etc. in the present invention are only for descriptive purposes, and should not be construed as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "preferred" or "less preferred" may expressly or implicitly include at least one of that feature. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist. , is not within the scope of protection required by the present invention.

Referring to Fig. 1, a composite pipe comprises an outer pipe and an inner pipe arranged in the outer pipe, one end of the outer pipe is provided with an outer pipe socket section 1, and the other end of the outer pipe is provided with an outer pipe socket section 2, One end of the inner tube is provided with an inner tube socket section 3, and the other end of the inner tube is provided with an inner tube socket section 4. The inner pipe socket section 3 and the outer pipe socket section 1 can be located at the same end of the composite pipe. Correspondingly, the inner pipe socket section 4 and the outer pipe socket section 2 are both located at the other end of the composite pipe; The mouth section 3 and the outer tube socket section 2 are arranged at the same end of the composite tube, and correspondingly, the inner tube socket section 4 and the outer tube socket section 1 are both positioned at the other end of the composite tube.

Referring to FIGS. 2 to 8 , by connecting two composite pipes with sockets and sockets, a double-sealed double-socketed structure of the composite pipes can be formed.

Example 1

Referring to FIGS. 2 to 5 , the present embodiment proposes a double-seal double-socket structure for a composite pipe, which includes an outer pipe socket structure and an inner pipe socket structure disposed within the outer pipe socket structure.

The outer tube socket structure includes an outer tube socket section 1 and an outer tube socket section 2 that are plugged together. The outer tube socket section 1 and the outer tube socket section 2 are generally made of rigid materials such as steel and aluminum alloys. The outer tube socket section The outer side wall of 2 is provided with an outer pipe socket connection part, the inner side wall of the outer pipe socket section 1 is provided with an outer pipe socket connection part, and the outer pipe socket connection part is matched and connected with the outer pipe socket connection part, so that the outer pipe socket is connected. The section 2 and the outer tube socket section 1 can rotate relative to each other and can restrict the separation of the outer tube socket section 2 and the outer tube socket section 1 after the relative rotation of the outer tube socket section 2 and the outer tube socket section 1 .

The inner tube socket structure includes the inner tube socket section 3 and the inner tube socket section 4 that are plugged together. The inner tube socket section 3 and the inner tube socket section 4 are generally made of plastic and other materials with a little elasticity, such as PE, PP -R, PVC, HDPE. Between the inner side wall of the inner pipe socket section 3 and the outer side wall of the inner pipe socket section 4, an inner pipe sealing structure and an inner pipe connection structure capable of restricting the separation of the inner pipe socket section 3 and the inner pipe socket section 4 are provided.

In this embodiment, after the two composite pipes are socketed together, the inner pipe connection structure can limit the separation of the two composite pipes without geological settlement, and at the same time, the inner pipe sealing structure can ensure the integrity of the inner pipe socket structure. Seal to prevent the water in the pipe from contacting the outer pipe and causing the outer pipe to be corroded. When geological subsidence occurs, the two composite pipes rotate relative to each other, and the outer pipe socket connection part and the outer pipe socket connection part are engaged with each other, which can further improve the connection strength and avoid the separation of the two composite pipes due to the pressure of geological subsidence.

In this embodiment, the right end of the outer tube socket section 1 is open, and the outer tube socket section 2 is inserted into the outer tube socket section 1 through the right port of the outer tube socket section 1 .

The inner pipe socket section 3 and the outer pipe socket section 1 are located at the same end of the composite pipe, and the inner pipe socket section 4 and the outer pipe socket section 2 are both located at the other end of the composite pipe. That is, the inner tube socket section 3 is arranged inside the outer tube socket section 1 , and the inner tube socket section 4 is arranged in the outer tube socket section 2 .

Referring to FIG. 5 , the inner side wall of the outer tube socket section 1 is provided with a first spherical concave surface 11 located on the right side of the connection part of the outer tube socket, and the outer side wall of the outer tube socket section 2 is provided with a first spherical concave surface 11 to fit The first spherical convex surface 21 is also provided with an outer tube sealing structure between the first spherical concave surface 11 and the first spherical convex surface 21 .

Preferably, the outer tube sealing structure includes a first sealing ring 51 fixedly arranged on the outer tube socket section 2 , the outer surface of the first sealing ring 51 is a spherical convex surface co-centered with the first spherical convex surface 21 , and the first sealing ring The outer surface of 51 slightly protrudes from the first spherical convex surface 21 and is in an interference fit with the first spherical concave surface 11 . The material of the first sealing ring 51 may be rubber, polytetrafluoroethylene, graphite, sealant, etc., preferably a material with higher hardness such as polytetrafluoroethylene.

The first spherical concave surface 11 defines a sphere, and the spherical center point P of the sphere should be set on the central axis of the outer pipe socket section 1 or near the central axis of the outer pipe socket section 1 .

The first spherical concave surface 11 and the first spherical convex surface 21 can play the role of determining the center of rotation. When geological subsidence occurs, the outer pipe socket section 1 and the outer pipe socket section 2 rotate relative to the spherical center point P, and the first spherical The concave surface 11 and the first spherical convex surface 21 also slide relative to each other, and the first sealing ring 51 and the first spherical concave surface 11 are always in close contact, with good sealing performance and high connection strength.

In a solution of this embodiment, a first flat wall section 22 lower than the first spherical convex surface 21 is provided on the outer side wall of the outer tube socket section 2 , and the first flat wall section 22 and the first spherical convex surface 21 are arranged between the first flat wall section 22 and the first spherical convex surface 21 A step is formed, the first sealing ring 51 is sleeved on the first flat wall section 22, and the first flat wall section 22 is also sleeved with a pressing plate 52 capable of pressing the first sealing ring 51 on the step, the pressing plate 52 and the outer tube Socket section 2 is screwed. Generally, two pressing plates 52 are used. The two pressing plates 52 are spliced into a circular ring, and the annular first sealing ring 51 is pressed tightly, so that the outer surface of the first sealing ring 51 and the first spherical concave surface 11 are kept in a pressed state.

In another solution of this embodiment, the first sealing ring 51 may also be fixed to the above-mentioned step by means of bonding.

Referring to FIG. 5 , the connection part of the outer tube socket includes a plurality of socket inverted teeth 12 arranged around the inner side wall of the outer tube socket section 1, and a tooth slot is formed between every two adjacent socket inverted teeth 12. The left side wall of the slot is provided with a second spherical concave surface 13 that is concentric with the first spherical concave surface 11 , the outer tube socket connection part includes a plurality of socket inverted teeth 23 arranged around the outer side wall of the outer tube socket section 2, and the socket inverted teeth The left side wall of 23 is provided with a second spherical convex surface 24 that fits with the second spherical concave surface 13, and the space between the right side wall of the socket inverted tooth 23 and the right side wall of the tooth slot is reserved for the outer pipe socket section 1. Relative to the space where the outer tube socket section 2 rotates, when the outer tube socket section 1 rotates relative to the outer tube socket section 2, the socket inverted teeth 23 are engaged with the tooth grooves to limit the separation of the outer tube socket section 1 and the outer tube socket section 2. .

The number of socket inverted teeth 23 and tooth slots is preferably 2, and the tooth crest diameter of each socket inverted tooth 23 is slightly smaller than the tooth crest diameter of the corresponding socket inverted tooth 12, so that the outer tube socket section 2 can be inserted into the outer tube without obstacles. pipe socket section 1.

The outer pipe socket connection part and the outer pipe socket connection part adopt the above-mentioned structural form, only need to insert the outer pipe socket section 1 and the outer pipe socket section 2 together, and at the same time connect the inner pipe socket section 3 and the inner pipe socket section. Section 4 is plugged together to complete the installation, which is convenient and quick. After the sockets of the two composite pipes are inserted together, the outer pipes of the two composite pipes can be locked by relatively rotating a slight angle, which ensures high connection strength.

Referring to FIG. 5 , the inner side wall of the inner pipe socket section 3 is provided with a third spherical concave surface 31 that is centered with the first spherical concave surface 11 , and the outer side wall of the inner pipe socket section 4 is provided with a third spherical concave surface 31 that fits The third spherical convex surface 41. The inner tube sealing structure includes a sealing groove 42 disposed on the third spherical convex surface 41 , and a second sealing ring 6 disposed in the sealing groove 42 and pressed by the third spherical concave surface 31 . With such an inner pipe sealing structure, when the geological subsidence occurs and the pipe joint is bent, the inner pipe socket section 3 and the inner pipe socket section 4 also rotate around the spherical center point P, and the third spherical concave surface 31 and the first The three spherical convex surfaces 41 relatively rotate and slip a small distance. During this process, the distance between the third spherical concave surface 31 and the bottom surface of the sealing groove 42 remains unchanged. .

In this embodiment, the inner pipe connecting structure includes an annular groove 33 disposed on the inner side wall of the inner pipe socket section 3 and an annular protrusion 43 disposed on the outer side wall of the inner pipe socket section 4. Each annular protrusion 43 snaps into one Corresponding annular groove 33 . The tooth shape of the annular protrusion 43 is triangular.

In this embodiment, the left inner wall of at least one annular groove 33 is provided with a fourth spherical concave surface 34 co-centered with the first spherical concave surface 11 , and the left side wall of the annular protrusion 43 is provided with the fourth spherical concave surface 34 The gap 7 is provided between the right side wall of the annular protrusion 43 and the right inner wall of the annular groove 33 .

5, the left end of the outer side wall of the inner pipe socket section 4 is provided with a second flat wall section 45, the inner wall of the inner pipe socket section 3 is provided with a third flat wall section 35 corresponding to the third flat wall section 35, the second A gap 7 is left between the flat wall section 45 and the third flat wall section 35 .

Example 2

FIG. 6 shows part of the structure of Embodiment 2 of the present invention. This embodiment has a similar structure to Embodiment 1, and the difference lies in the inner pipe connection structure between the inner pipe socket section 3 and the inner pipe socket section 4 . In this embodiment, the inner pipe connecting structure includes an annular groove 33 disposed on the inner side wall of the inner pipe socket section 3 and an annular protrusion 43 disposed on the outer side wall of the inner pipe socket section 4. Each annular protrusion 43 snaps into one The corresponding annular groove 33, the tooth shape of the annular protrusion 43 is a triangle, a gap 7 is left between the left side wall of the annular protrusion 43 and the left inner wall of the annular groove 33, the right side wall of the annular protrusion 43 and A gap 7 is also left between the right inner walls of the annular groove 33 .

Example 3

FIG. 7 shows part of the structure of Embodiment 3 of the present invention. This embodiment has a similar structure to Embodiment 1, and the difference lies in the inner pipe connection structure between the inner pipe socket section 3 and the inner pipe socket section 4 . In this embodiment, the inner pipe connecting structure includes an annular groove 33 disposed on the inner side wall of the inner pipe socket section 3 and an annular protrusion 43 disposed on the outer side wall of the inner pipe socket section 4. Each annular protrusion 43 snaps into one The corresponding annular groove 33, the tooth shape of the annular protrusion 43 is a trapezoid, between the left side wall of the annular protrusion 43 and the left inner wall of the annular groove 33, the right side wall of the annular protrusion 43 and the annular groove 33 A gap 7 is left between the right inner wall of the annular protrusion 43 and the groove bottom of the annular groove 33.

Example 4

FIG. 8 and FIG. 9 show the socket and socket structure of the inner tube in Embodiment 4 of the present invention. The socket and socket structure of the outer tube in this embodiment is the same as the socket and socket structure of the outer tube in Embodiment 1, and the difference lies in the inner tube. socket structure.

In this embodiment, the inner pipe socket section 3 and the outer pipe socket section 2 are arranged at the same end of the composite pipe, and the inner pipe socket section 4 and the outer pipe socket section 1 are both located at the other end of the composite pipe, that is, the inner pipe socket The mouth section 3 is arranged in the outer tube socket section 2 , and the inner tube socket section 4 is arranged in the outer tube socket section 1 .

The inner side wall of the inner pipe socket section 3 is provided with a third spherical concave surface 31 that is co-centered with the first spherical concave surface 11 , and the outer side wall of the inner pipe socket section 4 is provided with a third spherical concave surface 31 that fits with the third spherical concave surface 31 . Convex 41 .

The inner tube sealing structure includes a sealing groove 42 disposed on the third spherical convex surface 41 , and a second sealing ring 6 disposed in the sealing groove 42 and pressed by the third spherical concave surface 31 .

The inner pipe connecting structure includes an annular groove 33 arranged on the inner side wall of the inner pipe socket section 3 and an annular protrusion 43 arranged on the outer side wall of the inner pipe socket section 4, and each annular protrusion 43 is snapped into a corresponding annular groove. 33. The tooth shape of the annular protrusion 43 is a triangle, a gap 7 is left between the left side wall of the annular protrusion 43 and the left inner wall of the annular groove 33, the right side wall of the annular protrusion 43 and the right side of the annular groove 33 A gap 7 is also left between the inner walls.

The outer side wall of the inner pipe socket section 4 is provided with a socket step 46, the socket step 46 is provided with a fifth spherical concave surface 47 that has the same spherical center with the first spherical concave surface 11, and the left end face of the inner pipe socket section 3 is provided with the first spherical concave surface 47. The fifth spherical convex surface 36 is in contact with the five spherical concave surfaces 47 .

The above are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformation made by the contents of the description and drawings of the present invention, or directly or indirectly applied to other All relevant technical fields are included in the scope of patent protection of the present invention.

Claims (10)

1. The utility model provides a compound pipe double containment double socket joint structure which characterized in that, it includes: an outer pipe socket structure and an inner pipe socket structure arranged in the outer pipe socket structure,

the outer pipe socket structure comprises an outer pipe socket section (1) and an outer pipe socket section (2) which are connected together in an inserted mode, an outer pipe sealing structure is arranged between the outer pipe socket section (1) and the outer pipe socket section (2), an outer pipe socket connecting part is arranged on the outer side wall of the outer pipe socket section (2), an outer pipe socket connecting part is arranged on the inner side wall of the outer pipe socket section (1), and the outer pipe socket connecting part are connected in a matched mode so that the outer pipe socket section (2) and the outer pipe socket section (1) can rotate relatively and can be limited to be separated after the outer pipe socket section (2) and the outer pipe socket section (1) rotate relatively;

the inner pipe socket structure comprises an inner pipe socket section (3) and an inner pipe socket section (4) which are connected in an inserting mode, wherein an inner pipe sealing structure and an inner pipe connecting structure capable of limiting the inner pipe socket section (3) and the inner pipe socket section (4) to be separated are arranged between the inner side wall of the inner pipe socket section (3) and the outer side wall of the inner pipe socket section (4).

2. The dual-sealing double socket structure of composite pipe according to claim 1, wherein the right end of the outer pipe socket section (1) is open and the outer pipe socket section (2) is inserted into the outer pipe socket section (1) through the right end of the outer pipe socket section (1), the inner side wall of the outer pipe socket section (1) is provided with a first spherical concave surface (11) located at the right side of the outer pipe socket connection portion, the outer side wall of the outer pipe socket section (2) is provided with a first spherical convex surface (21) fitted with the first spherical concave surface (11), and the outer pipe sealing structure is disposed between the first spherical concave surface (11) and the first spherical convex surface (21).

3. The dual sealing and double socket structure for composite pipe according to claim 2, wherein the outer pipe sealing structure comprises a first sealing ring (51) fixedly disposed on the outer pipe socket section (2), the outer side surface of the first sealing ring (51) is a spherical convex surface concentric with the first spherical convex surface (21), and the outer side surface of the first sealing ring (51) slightly protrudes from the first spherical convex surface (21) and is in interference fit with the first spherical concave surface (11).

4. The dual-sealing double-socket structure for the composite pipe according to claim 3, wherein the outer side wall of the outer pipe socket section (2) is provided with a first flat wall section (22) lower than the first spherical convex surface (21), a step is formed between the first flat wall section (22) and the first spherical convex surface (21), the sealing ring is sleeved on the first flat wall section (22), the first flat wall section (22) is further sleeved with a pressing plate (52) capable of pressing the sealing ring on the step, and the pressing plate (52) is connected with the outer pipe socket section (2).

5. The dual-sealing and double-socket structure for the composite pipe according to claim 2, wherein the socket connecting portion of the outer pipe comprises a plurality of socket inverted teeth (12) circumferentially arranged on the inner side wall of the socket section (1) of the outer pipe, a tooth socket is formed between every two adjacent socket inverted teeth (12), a second spherical concave surface (13) concentric with the first spherical concave surface (11) is arranged on the left side wall of the tooth socket, the socket connecting portion of the outer pipe comprises a plurality of socket inverted teeth (23) circumferentially arranged on the outer side wall of the socket section (2) of the outer pipe, a second spherical convex surface (24) attached to the second spherical concave surface (13) is arranged on the left side wall of the socket inverted teeth (23), and a space for the socket section (1) of the outer pipe to rotate relative to the socket section (2) of the outer pipe is reserved between the right side wall of the socket inverted teeth (23) and the right side wall of the tooth socket section of the outer pipe, when the outer pipe socket section (1) rotates relative to the outer pipe socket section (2), the socket inverted teeth (23) are meshed with the tooth grooves to limit the outer pipe socket section (1) to be separated from the outer pipe socket section (2).

6. The dual-sealing double-socket structure for compound pipes as claimed in claim 2, wherein the inner side wall of the inner pipe socket section (3) is provided with a third spherical concave surface (31) concentric with the first spherical concave surface (11), and the outer side wall of the inner pipe socket section (4) is provided with a third spherical convex surface (41) attached to the third spherical concave surface (31).

7. The dual sealing double socket structure of composite pipe according to claim 6, wherein the inner pipe sealing structure comprises a sealing groove (42) provided in the third spherical convex surface (41), and a second sealing ring (6) provided in the sealing groove (42) and compressed by the third spherical concave surface (31).

8. The dual sealing dual socket structure of composite pipe according to claim 7, wherein the inner pipe connecting structure comprises an annular groove (33) provided on the inner sidewall of the inner pipe socket section (3) and an annular protrusion (43) provided on the outer sidewall of the inner pipe socket section (4), each annular protrusion (43) is snapped into a corresponding annular groove (33) with a gap (7) left therebetween.

9. The dual sealing and double socket structure for compound pipes according to claim 8, wherein a fourth spherical concave surface (34) concentric with the first spherical concave surface (11) is provided on the left inner wall of at least one annular groove (33), a fourth spherical convex surface (44) abutting the fourth spherical concave surface (34) is provided on the left side wall of the annular protrusion (43), and the gap (7) is provided between the right side wall of the annular protrusion (43) and the right inner wall of the annular groove (33).

10. The dual-sealing double-socket structure of the compound pipe as claimed in claim 8, wherein the outer sidewall of the socket section (4) of the inner pipe is provided with a socket step (46), the socket step (46) is provided with a fifth spherical concave surface (47) concentric with the first spherical concave surface (11), and the left end surface of the socket section (3) of the inner pipe is provided with a fifth spherical convex surface (36) jointed with the fifth spherical concave surface (47).

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