Pipe rotational molding connecting sleeve

Abstract

The utility model relates to a pipe rotational molding connecting sleeve which is integrally of a circumferential complete closed structure formed by rotational molding processing, the two ends of the connecting sleeve are connecting ends used for insertion of the ends of a pipe, a positioning ring protruding towards the axis position is arranged between the two connecting ends, and the inner diameter of the positioning ring is matched with the inner diameter of the pipe. The inner wall of the connecting end is a smooth cylindrical surface; a mounting part of the sealing ring is formed in the connecting end. The connecting sleeve is processed through rotational molding, so that the wall thickness of the connecting sleeve is uniform, no bonding trace or bonding part exists, the product quality is stable, the connecting sleeve processed through rotational molding is small in internal stress and not prone to denaturation, the structural stability of the connecting sleeve is good, the internal size of the connecting end better meets the requirement, and inserting fit with the end of a pipe is more convenient; when the sealing ring is used for sealing in the insertion connection with the pipe, the contact sealing performance between the sealing ring and the inner surface of the connecting end can be better; a positioning ring is arranged in the connecting sleeve, and insertion of the end of the pipe can be positioned or limited through the positioning ring.

Description

Technical Field

[0001] The utility model belongs to the field of pipe connection, in particular to a pipe rotational molding connection sleeve. Background Art

[0002] After being manufactured at the factory, drainage pipes need to be transported to the construction site for installation. One of the installation steps is to connect the ends of the drainage pipes one by one, connecting them end to end to form an underground water pipe. Existing drainage pipes are often connected by plug-in or bonding. The plug-in connection method is to provide a spigot and a socket at each end of the drainage pipe, and the spigot is inserted into the socket. The bonding method is to connect the two ends of the drainage pipes relative to each other using glue or external ferrules.

[0003] However, the spigot-and-socket method requires the addition of a dedicated spigot and socket at the end of the drain pipe. This requires mold changes if produced simultaneously with the pipe body, and subsequent bonding adds additional steps and can easily lead to leakage at the bonded joint. Bonded connections also require on-site heating, requiring more equipment. The external hoop method, however, lacks a fully enclosed structure and is prone to leakage. Summary of the Invention

[0004] The utility model provides a pipe rotationally molded connecting sleeve, which is manufactured separately from the pipe body by rotational molding. There is no need to change the mold during the pipe body processing process, and no need for subsequent bonding. The rotationally molded connecting sleeve has a circumferentially complete and closed structure. The product has high dimensional accuracy and good dimensional stability. Equipped with a sealing ring, it is easy to connect and can achieve better connection sealing.

[0005] The specific technical solution of the utility model is: a pipe rotationally molded connecting sleeve, which is a circumferentially complete and closed structure formed by rotational molding as a whole. The two ends of the connecting sleeve are connecting ends for inserting the ends of the pipe. A positioning ring protruding toward the axial part is provided between the two connecting ends. The inner diameter of the positioning ring coincides with the inner diameter of the pipe. The inner wall of the connecting end is a smooth cylindrical surface; the installation part of the sealing ring is formed inside the connecting end.

[0006] The connecting sleeve is processed by rotational molding, so that the wall thickness of the connecting sleeve is uniform, there are no bonding marks and bonding parts, the product quality is stable, the internal stress of the rotationally molded connecting sleeve is small, it is not easy to deform, the structural stability of the connecting sleeve is good, the internal dimensions of the connecting end of the rotationally molded connecting sleeve are more in line with the requirements, and it is more convenient to plug in and match with the end of the pipe. When the sealing ring is used to seal with the pipe, the contact sealing between the sealing ring and the inner surface of the connecting end can be better; a positioning ring is provided inside the connecting sleeve, and the positioning ring can be used to position or limit the insertion of the pipe end, and at the same time, it can also separate the opposite ends of the two pipes, which can reduce the size requirements of the pipe end face. At the same time, the positioning ring is convex, which can strengthen the connecting sleeve.

[0007] Preferably, the connecting sleeve is positioned between the opposing ends of the two pipes to be connected. The connecting sleeve is inserted into the cylindrical, smooth-walled pipe. The end faces of the two pipes face the side faces of the internal locating ring of the connecting sleeve. A sealing ring is positioned between the inner wall of the connecting end and the outer wall of the pipe end, sealing the gap between the connecting sleeve and the pipe. This is a connection structure in which the ends of the pipes to be connected by the connecting sleeve are cylindrical, smooth-walled. The end of the cylindrical pipe wall is directly inserted into the connecting end of the connecting sleeve, and the sealing ring is located on the cylindrical smooth wall.

[0008] Preferably, an axial gap is formed between the connecting sleeve and the end of the pipe, the end face of the pipe abuts against the side of the positioning ring in the connecting sleeve, and the sealing ring closes the axial gap. Alternatively, a radial gap is formed between the end face of the pipe and the side of the positioning ring in the connecting sleeve, the radial gap and the axial gap are interconnected, and the sealing ring has an L-shaped cross-section, sealing both the radial and axial gaps. Depending on the insertion depth of the pipe end, a separate axial gap is formed between the pipe end and the connecting sleeve, or a gap structure in which the radial gap and the axial gap are interconnected. Appropriate sealing rings are selected as needed. For a separate axial gap, a cylindrical sealing ring or multiple sets of circular sealing rings are used; for an L-shaped gap, a sealing ring with an L-shaped cross-section is used.

[0009] Preferably, the inner diameter of the inner wall of the connecting end of the connecting sleeve is adapted to the outer diameter of the end of the pipe to be connected, and a radially concave sealing groove is provided on the outer surface of the end of the pipe, and a sealing ring is nested in the sealing groove to seal the gap between the end of the pipe and the connecting sleeve.

[0010] Preferably, a pressure ring is provided on the inner wall of the end portion of the connection end, protruding in the axial direction, with the protrusion height of the pressure ring being less than the protrusion height of the positioning ring. The presence of the pressure ring forms a stepped surface structure on the inner wall of the connection end, so that the matching sealing ring also has a stepped surface, which can limit the sealing ring during sealing.

[0011] Preferably, the protruding height of the pressure ring is smaller than the protruding height of the positioning ring, the outer surface of the end of the tube is a cylindrical smooth wall, the inner diameter of the pressure ring is larger than the outer diameter of the cylindrical smooth wall, and a gap is formed between the inner wall of the connecting end and the outer surface of the end of the tube. A sealing ring is provided in the gap, and the cross-section of the sealing ring is stepped.

[0012] Preferably, the connecting ends at both ends of the connector sleeve are symmetrical relative to the center, and the internal shapes and dimensions of the two connecting ends are equal, or the internal dimensions of the two connecting ends are different, with the internal dimensions of the connecting end at one end being larger than the internal dimensions of the connecting end at the other end. If the internal dimensions of the two connecting ends are equal, the connector sleeve can be used to connect the same pipe. If the internal dimensions of the two connecting ends are different, it can connect two different pipes, such as the side pipe of a main pipe.

[0013] Preferably, grooves for cooperating with and fixing the sealing ring are provided on both side surfaces of the positioning ring. The cross-section of the grooves is square, and the grooves are distributed in a circular shape along the side surfaces of the positioning ring.

[0014] Preferably, the connecting sleeve is plugged into a tubular material having a cylindrical smooth wall at its end, forming a radial gap and an axial gap between the connecting sleeve and the tubular end. The sealing ring is located within the gap and seals the gap. The sealing ring is hollow and provided with an embedded ring that fits into the groove. After the tubular end and the connecting sleeve are plugged in, the sealing ring is extruded into an L-shape and seals the radial gap and the axial gap. The use of a hollow sealing ring for sealing allows the sealing ring to be squeezed and deformed to conform to the shape of the gap, thereby improving the sealing effect.

[0015] Preferably, the inner wall of the connecting end is provided with a wave crest groove near the end to match the wave crest of the pipe, and the end of the connecting end is provided with a back-stop wedge. The back-stop wedge is used to match the wave crest on the surface of the tarpaulin pipe to prevent back-movement, thereby ensuring the position between the pipe and the connecting sleeve and ensuring a good seal.

[0016] Preferably, a plurality of axial grooves are provided in the circumferential direction of the end of the connection end, and the axial grooves extend to the middle position of the wave crest groove. The provision of the axial grooves facilitates the expansion of the end of the connection end and facilitates the engagement of the retaining wedge.

[0017] The beneficial effects of the present invention are as follows: the connecting sleeve is processed by rotational molding, so that the wall thickness of the connecting sleeve is uniform, there are no bonding marks and bonding parts, the product quality is stable, the internal stress of the rotationally molded connecting sleeve is small, it is not easy to deform, the structural stability of the connecting sleeve is good, the internal size of the connecting end of the rotationally molded connecting sleeve is more in line with the requirements, and it is more convenient to plug and match with the end of the pipe. When the sealing ring is used to seal with the pipe, the contact sealing between the sealing ring and the inner surface of the connecting end can be made better; a positioning ring is arranged inside the connecting sleeve, and the positioning ring can be used to position or limit the insertion of the pipe end, and at the same time, it can also separate the opposite ends of the two pipes, which can reduce the size requirements of the end face of the pipe. At the same time, the positioning ring is convex, which can strengthen the connecting sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the utility model;

[0019] Figure 2 This is a schematic diagram of the use of the utility model;

[0020] Figure 3 This is a schematic diagram of the second use of the utility model;

[0021] Figure 4 This is a schematic diagram of the third use of the utility model;

[0022] Figure 5 This is a schematic diagram of the second structure of the utility model;

[0023] Figure 6 This utility model Figure 5 A schematic diagram of the use of the structure shown;

[0024] Figure 7 This is a schematic diagram of the third structure of the utility model;

[0025] Figure 8 This is a schematic diagram of the fourth structure of the utility model;

[0026] Figure 9 This is a schematic diagram of the structure of the fifth clock of the present utility model;

[0027] In the figure: 1. Connecting sleeve, 2. Positioning ring, 3. Connecting end, 4. Mounting part, 5. Pipe, 6. Cylindrical smooth wall, 7. Axial gap, 8. Sealing ring, 9. Radial gap, 10. Sealing groove, 11. Groove, 12. Embedded ring, 13. Pressing ring, 14. Wave crest groove, 15. Back-off wedge, 16. Axial groove. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to specific embodiments and in conjunction with the accompanying drawings. Example

[0029] like Figure 1 As shown, a pipe roto-molded connecting sleeve is a cylindrical structure that is completely closed in the circumference and is formed by roto-molding. The two ends of the connecting sleeve 1 are connecting ends 3 for inserting the ends of the pipe. A positioning ring 2 is provided between the two connecting ends, protruding toward the axis. The positioning ring is located in the middle of the connecting sleeve. The inner diameter of the positioning ring matches the inner diameter of the pipe. The inner diameter of the positioning ring is cylindrical. The inner wall of the connecting end is a smooth cylindrical surface. The installation part 4 of the sealing ring is formed inside the connecting end. The two connecting ends are symmetrical with respect to the middle part of the connecting sleeve, and the internal shape and size of the two connecting ends are equal. The connecting sleeve is located between the opposite ends of the two pipes to be connected. The connecting sleeve and the ends of the pipes are plugged into each other, and the end faces of the two pipes are opposite to the side faces of the positioning ring inside the connecting sleeve.

[0030] like Figure 2As shown, the connecting sleeve is used to connect two pipes 5. The end of the pipe is a cylindrical plain wall 6, which is inserted into the connecting end of the connecting sleeve. The outer diameter of the cylindrical plain wall is smaller than the inner diameter of the connecting end, so an axial gap 7 is formed between the inner wall of the connecting end and the cylindrical plain wall of the pipe end. This gap is the installation position 4 of the sealing ring. After the end of the pipe is inserted, the end face of the pipe abuts against the side of the positioning ring in the connecting sleeve, and the sealing ring 8 is in the installation position and seals the axial gap between the pipe and the inner wall of the connecting end. The sealing ring 8 is columnar, and the cross-section of the sealing ring is a rectangular structure with rounded ends. The wall thickness of the sealing ring is slightly larger than the size of the axial gap, and the pipe is inserted into the connecting sleeve to squeeze the sealing ring. In this embodiment, there is one sealing ring at the installation position, and the width of the sealing ring is smaller than the axial length of the connecting end. Of course, multiple sealing rings can also be used and arranged side by side.

[0031] like Figure 3 As shown, the axial length of the cylindrical smooth wall of the pipe is smaller than the axial length of the connecting end. The end of the pipe is inserted into the connecting sleeve, and the two end faces of the connecting sleeve press against the side faces of the wave crest at the end position of the cylindrical smooth wall of the pipe. A radial gap 9 is left between the end face of the cylindrical smooth wall and the side face of the positioning ring in the connecting sleeve. The radial gap and the axial gap are interconnected to form an L-shaped gap. A sealing ring 8 is provided in the L-shaped gap. The cross-section of the sealing ring is L-shaped. The radial portion of the sealing ring is located in the radial gap, and the axial portion of the sealing ring is located in the axial gap. The thickness of the radial portion of the sealing ring is greater than the width of the radial gap, and the thickness of the axial portion of the sealing ring is greater than the width of the axial gap. After the sealing ring is set, it is squeezed and seals the gap between the pipe and the connecting sleeve.

[0032] like Figure 4 As shown, the inner diameter of the inner wall of the connecting end of the connecting sleeve is adapted to the outer diameter of the end of the pipe 5 to be plugged in. The outer surface of the end of the pipe is provided with a radially concave sealing groove 10, in which a sealing ring 8 is nested to close the gap between the end of the pipe and the connecting sleeve. The sealing groove is square, trapezoidal or U-shaped. Figure 4 The sealing groove is square, and the sealing ring has a circular cross-section. The length of the connecting end covers at least two sealing grooves in the pipe, and at least two sealing rings are provided between the pipe and the connecting end. The end face of the pipe abuts the side of the positioning ring in the connecting sleeve. Example

[0033] like Figure 5 Figure 6As shown, a pipe roto-molded connecting sleeve differs from Example 1 in that grooves 11 for fitting and securing a sealing ring 8 are provided on both sides of a positioning ring 2. The grooves have a square cross-section and are distributed in a circular pattern along the side of the positioning ring. The connecting sleeve is plugged into a pipe 5 with a cylindrical, smooth-walled end. A radial gap 9 and an axial gap 7 are formed between the connecting sleeve and the pipe end. The sealing ring is located within these gaps and provides a seal. The sealing ring has a hollow interior and is provided with an embedded ring 12 that matches the groove. After the pipe end and the connecting sleeve are plugged into each other, the sealing ring is extruded into an L-shape and seals the radial and axial gaps.

[0034] A cylindrical sealing ring may be provided in the axial gap between the end of the pipe and the connecting end to increase the sealing performance between the pipe and the connecting sleeve. Example

[0035] like Figure 7 The figure shows a roto-molded tubing connector. This differs from Example 1 in that a pressure ring 13 protruding axially is provided on the inner wall of the connector end. The protrusion of the pressure ring is less than that of the positioning ring, and the inner wall of the connector end is stepped. The connector is plugged into a tubing 5 with a cylindrical, smooth-walled end. An axial gap 7 is formed between the connector and the tubing end. A sealing ring 8 is provided within this axial gap. The outer circumference of the sealing ring is stepped and matches the shape of the inner wall of the connector end. Example

[0036] like Figure 8 The figure shows a roto-molded tubing connector sleeve. This differs from Example 1 in that a wave crest groove 14 is provided near the inner wall of the connector end to mate with the tubing's wave crests, and a retaining wedge 15 is provided at the end of the connector end. Several axial grooves 16 are provided circumferentially along the connector end, extending to the middle of the wave crest groove. When the tubing end is connected to the connector sleeve, the tubing end forms a cylindrical, smooth wall. The first wave crest of the tubing mates with the wave crest groove, and the retaining wedge engages with the top side of the wave crest to form a retaining wedge. Example

[0037] like Figure 9 The figure shows a roto-molded pipe connector sleeve. The internal dimensions of the two connecting ends differ, with one end having a larger internal dimension than the other. The sleeve has a tapered center, and the inner surface of the retaining ring inside the sleeve is tapered. The two side surfaces of the retaining ring are radial annular surfaces. This embodiment of the connector sleeve can be used to connect two pipes of different diameters.

[0038] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation of the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A pipe rotational molding connecting sleeve, characterized in that: The entire structure is a circumferentially complete closed structure formed by rotational molding. The two ends of the connecting sleeve are connecting ends (3) for inserting the ends of the pipe. A positioning ring (2) protruding toward the axis is provided between the two connecting ends. The inner diameter of the positioning ring matches the inner diameter of the pipe. The inner wall of the connecting end is a smooth cylindrical surface. The inside of the connecting end forms a mounting portion (4) for the sealing ring.

2. The pipe rotational molding connecting sleeve according to claim 1, characterized in that: The connecting sleeve is located between the opposite ends of the two pipes to be connected. The connecting sleeve is plugged into the pipe with a cylindrical smooth wall at the end. The end faces of the two pipes are opposite to the side faces of the internal positioning ring of the connecting sleeve. A sealing ring is provided between the inner wall of the connecting end and the outer wall of the end of the pipe to seal the gap between the connecting sleeve and the pipe.

3. The pipe rotational molding connecting sleeve according to claim 2, characterized in that: An axial gap is formed between the connecting sleeve and the end of the pipe, the end face of the pipe abuts against the side of the positioning ring in the connecting sleeve, and the sealing ring closes the axial gap; or, there is a radial gap between the end face of the pipe and the side of the positioning ring in the connecting sleeve, the radial gap and the axial gap are connected, the cross-section of the sealing ring is L-shaped, and the L-shaped sealing ring seals the radial gap and the axial gap.

4. The pipe rotational molding connecting sleeve according to claim 1, characterized in that: The inner diameter of the inner wall of the connecting end of the connecting sleeve is adapted to the outer diameter of the end of the pipe to be connected. A radially concave sealing groove is provided on the outer surface of the end of the pipe. A sealing ring is nested in the sealing groove to seal the gap between the end of the pipe and the connecting sleeve.

5. The pipe rotational molding connecting sleeve according to claim 1, characterized in that: The inner wall of the end of the connecting end is provided with a pressure ring protruding in the axial direction, and the protruding height of the pressure ring is smaller than the protruding height of the positioning ring; the protruding height of the pressure ring is smaller than the protruding height of the positioning ring, the outer surface of the end of the pipe is a cylindrical smooth wall, the inner diameter of the pressure ring is larger than the outer diameter of the cylindrical smooth wall, and a gap is formed between the inner wall of the connecting end and the outer surface of the end of the pipe, and a sealing ring is provided in the gap, and the cross-section of the sealing ring is stepped.

6. The pipe rotational molding connecting sleeve according to claim 1, characterized in that: The connecting ends at both ends of the connecting sleeve are symmetrical relative to the middle position, and the internal shapes and sizes of the two connecting ends are equal, or the internal sizes of the two connecting ends are different, and the internal size of the connecting end at one end is larger than the internal size of the connecting end at the other end.

7. The pipe rotational molding connector according to claim 1, characterized in that: Grooves for fitting and fixing the sealing ring are provided on both sides of the positioning ring. The cross section of the grooves is square and the grooves are distributed in a circular shape along the sides of the positioning ring.

8. The pipe rotational molding connecting sleeve according to claim 7, characterized in that: The connecting sleeve is plugged into the pipe with a cylindrical smooth wall at the end. A radial gap and an axial gap are formed between the connecting sleeve and the end of the pipe. The sealing ring is located in the gap and seals. The sealing ring has an internal hollow structure and is provided with an embedded ring that matches the groove. After the end of the pipe is plugged into the connecting sleeve, the sealing ring is extruded into an L shape and seals the radial gap and the axial gap.

9. A pipe rotational molding connector according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8, characterized in that: The inner wall of the connecting end is provided with a wave crest groove near the end position for matching the wave crest of the pipe, and the end of the connecting end is provided with a back-stop wedge.

10. The pipe rotational molding connecting sleeve according to claim 9, characterized in that: A plurality of axial grooves are arranged in the circumferential direction of the end portion of the connection end, and the axial grooves extend to the middle position of the wave crest groove.

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