A composite pipe connector

Abstract

This invention discloses a composite pipe connector, including a sleeve, a connecting pipe, and a rubber sealing ring. An annular groove is formed on the inner wall of the sleeve, and a radially protruding retaining ring is provided at the bottom of the groove. An annular groove is formed between the outer wall of the retaining ring and the corresponding groove wall. The rubber sealing ring is engaged within the annular groove. A sealing groove is formed on the side of the rubber sealing ring away from the retaining ring. The connecting pipe is fitted inside the sleeve, and an abutting surface is provided on the end of the connecting sleeve near the rubber sealing ring, abutting against the sealing groove. The beneficial effects of this invention are: the rubber sealing sleeve provides a triple sealing effect, ensuring the sealing performance of the connector; simultaneously, the water flow rate is not affected during use, thus avoiding pressure differentials at both ends of the composite pipe connector, thereby improving the reliability of the composite pipe connector.

Description

Technical Field

[0001] This invention relates to polyethylene composite pipes, and more particularly to a composite pipe connector. Background Technology

[0002] Polyethylene composite pipes are polymerized from ethylene monomers. Due to variations in polymerization conditions such as pressure and temperature, polyethylene of different densities can be obtained. When processing different types of PE pipes, different resin grades are selected based on their application conditions, and the requirements for extruders and molds also differ, naturally resulting in different performance characteristics of the polyethylene composite pipes. A good pipe should not only be economical but also possess a series of advantages such as stable and reliable joints, impact resistance, crack resistance, aging resistance, and corrosion resistance. Therefore, its applications in practical life are becoming increasingly widespread, making the connectors used for polyethylene composite pipes extremely important.

[0003] Chinese patent CN208951513U discloses a polyethylene composite pipe connector and a compatible polyethylene composite pipe. The connector uses a T-shaped limiting mechanism, with two water-swellable rubber rings embedded in the T-shaped openings on both sides. The connector employs a double seal, including a heat-fusion seal and a rubber ring seal, fundamentally preventing water pressure penetration into the pipe wall and fittings, and preventing direct contact between the steel wire and the liquid from affecting the water flow. The rubber ring connection, combined with electrofusion welding, fuses the pipe and fittings into a single unit, overcoming the shortcomings of single rubber ring joints, such as easy detachment, low settlement load, easy axial displacement, poor water thrust resistance, and low pressure resistance. However, this sealing method uses a socket seal, and the addition of a support point for fixing the rubber ring further reduces water flow. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a composite pipe connector.

[0005] The objective of this invention is achieved through the following technical solution: A composite pipe connector includes a sleeve, a connecting pipe, and a rubber sealing ring. An annular groove is formed on the inner wall of the sleeve, and a radially protruding retaining ring is provided at the bottom of the annular groove. An annular groove is formed between the outer wall of the retaining ring and the corresponding groove wall of the annular groove. The rubber sealing ring is secured in the annular groove. A sealing groove is formed on the side of the rubber sealing ring away from the retaining ring. The connecting pipe is sleeved inside the sleeve, and an abutting surface is provided on the end of the connecting sleeve near the rubber sealing ring. The abutting surface abuts against the sealing groove.

[0006] Optionally, the retaining ring has a first conical surface and a vertical surface on both the left and right sides, and the two side walls of the annular groove are outwardly flared second conical surfaces. The corresponding first conical surface, vertical surface, bottom of the annular groove, and second conical surface form a sealing groove.

[0007] Optionally, the outer wall of the rubber sealing ring is a snap-fit ​​surface, the side wall near the vertical surface is an abutment surface, the inner wall of the rubber sealing ring is a third conical surface, the snap-fit ​​surface is in contact with the bottom of the annular groove, the abutment surface is in contact with the vertical surface, the third conical surface is in contact with the first conical surface, and a fourth conical surface is also provided on the side of the rubber sealing ring away from the snap ring. The fourth conical surface is located outside the sealing groove and is in contact with the second conical surface.

[0008] Optionally, the sealing groove includes a fifth conical surface, a sixth conical surface, and a seventh conical surface. The angle between the fifth and sixth conical surfaces is an obtuse angle, the angle between the sixth and seventh conical surfaces is an obtuse angle, the angle between the fifth and fourth conical surfaces is an acute angle, and the angle between the third and seventh conical surfaces is an acute angle.

[0009] Optionally, the end of the connecting tube near the retaining ring is provided with an eighth, ninth, and tenth conical surface, with the eighth conical surface in close contact with the fifth conical surface, the ninth conical surface in close contact with the sixth conical surface, and the tenth conical surface in close contact with the seventh conical surface.

[0010] Optionally, heating resistance wires are provided on the inner walls of the sleeves located on the left and right sides of the retaining ring, and the heating resistance wires are connected to the electrofusion connection posts outside the sleeves.

[0011] Optionally, the inner diameter of the retaining ring is the same as the inner diameter of the connecting pipe.

[0012] Optionally, the wall thickness of the sleeve gradually increases from the end to the middle.

[0013] The present invention has the following advantages: the composite pipe connector of the present invention has a triple sealing effect with a rubber sealing sleeve, which ensures the sealing performance of the connector. At the same time, the water flow rate is not affected during use, thereby avoiding the pressure difference between the two ends of the composite pipe connector and improving the reliability of the composite pipe connector. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention;

[0015] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0016] Figure 3 This is a schematic diagram of the casing structure.

[0017] Figure 4 for Figure 3 Enlarged diagram of point A

[0018] Figure 5 Schematic diagram of the structure of a rubber sealing ring

[0019] Figure 6 A cross-sectional view of a rubber sealing ring.

[0020] Figure 7 This is a schematic diagram of the connecting pipe.

[0021] In the diagram, 1-sleeve, 2-connecting pipe, 3-rubber sealing ring, 4-heating resistance wire, 5-electrofusion terminal, 11-clamping ring, 12-annular groove, 13-annular groove, 111-first conical surface, 112-vertical surface, 121-second conical surface, 31-clamping surface, 32-abutting surface, 33-third conical surface, 34-fourth conical surface, 35-fifth conical surface, 36-sixth conical surface, 37-seventh conical surface, 21-eighth conical surface, 22-ninth conical surface, 23-tenth conical surface. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] like Figure 1 As shown, a composite pipe connector, such as Figure 1 and Figure 2 As shown, the device includes a sleeve 1, a connecting pipe 2, and a rubber sealing ring 3. An annular groove 12 is formed on the inner wall of the sleeve 1. A radially protruding retaining ring 11 is provided at the bottom of the annular groove 12. Preferably, the retaining ring 11 is located in the middle of the bottom of the annular groove 12. In this case, as... Figure 3 and Figure 4 As shown, the left and right ends of the sleeve 1 are symmetrical to the retaining ring 11. An annular groove 13 is formed between the outer wall of the retaining ring 11 and the corresponding groove wall of the annular groove 12. The rubber sealing ring 3 is engaged within the annular groove 13. Figure 5 and Figure 6 As shown, a sealing groove is provided on the side of the rubber sealing ring 3 away from the retaining ring 11. The connecting pipe 2 is sleeved inside the sleeve 1, and an abutment surface 32 is provided on the end of the connecting sleeve 1 near the rubber sealing ring 3. The abutment surface 32 abuts against the sealing groove. Due to the presence of the annular groove 12, the size of the inside of the sleeve 1 protruding from the retaining ring 11 can be reduced, thereby making the difference between the inner diameter of the retaining ring 11 and the inner diameter of the connecting pipe 2 smaller. Consequently, the water flow rate will not decrease too much. Moreover, in this embodiment, the inner diameter of the retaining ring 11 is the same as the inner diameter of the connecting pipe 2, so the water flow rate will not decrease. In other words, when water flows through this composite pipe connector, the water flow rate will not be reduced, thus preventing water blockage. This avoids the water pressure at one end of the connector being greater than the water pressure at the other end, ensuring the reliability of the connector. Moreover, in this embodiment, after the connecting pipe 2 is installed, the connecting pipe 2 will compress the rubber sealing ring 3, forming a first seal between the connecting pipe 2 and the sealing groove, a second seal between the rubber sealing ring 3 and the retaining ring 11, and a third seal between the rubber sealing ring 3 and the annular groove 12, thereby further improving the sealing performance of the connector and improving the reliability of the connector.

[0029] In this embodiment, as Figure 4As shown, the retaining ring 11 has a first conical surface 111 and a vertical surface 112 on both its left and right sides. The two side walls of the annular groove 12 are outwardly flared second conical surfaces 121. The corresponding first conical surface 111, vertical surface 112, bottom of the annular groove 12, and second conical surface 121 form a sealing groove. Further, as... Figure 6 As shown, the outer sidewall of the rubber sealing ring 3 is the snap-fit ​​surface 31, the sidewall near the vertical surface 112 is the abutment surface 32, and the inner sidewall of the rubber sealing ring 3 is the third conical surface 33. The snap-fit ​​surface 31 fits against the bottom of the annular groove 12, the abutment surface 32 abuts against the vertical surface 112, and the third conical surface 33 fits against the first conical surface 111. A fourth conical surface 34 is also provided on the side of the rubber sealing ring 3 away from the snap ring 11. The fourth conical surface 34 is located outside the sealing groove and fits against the second conical surface 121. When the rubber sealing ring 3 is compressed, the fourth conical surface 34 and the third conical surface 121... The second conical surface 121 will be tightly fitted, the third conical surface 33 and the first conical surface 111 will be tightly fitted, the snap-fit ​​surface 31 will be tightly fitted with the bottom of the annular groove 12, and the abutting surface 32 will abut with the vertical surface 112, thereby ensuring its sealing effect. Furthermore, the sealing groove includes a fifth conical surface 35, a sixth conical surface 36 and a seventh conical surface 37. The included angle between the fifth conical surface 35 and the sixth conical surface 36 is an obtuse angle, the included angle between the sixth conical surface 36 and the seventh conical surface 37 is an obtuse angle, the included angle between the fifth conical surface 35 and the fourth conical surface 34 is an acute angle, and the included angle between the third conical surface 33 and the seventh conical surface 37 is an acute angle. Figure 7 As shown, the connecting pipe 2 has an eighth conical surface 21, a ninth conical surface 22, and a tenth conical surface 23 near the retaining ring 11. The eighth conical surface 21 is in close contact with the fifth conical surface 35, the ninth conical surface 22 is in close contact with the sixth conical surface 36, and the tenth conical surface 23 is in close contact with the seventh conical surface 37. During installation, when the rubber sealing ring 3 is subjected to the axial thrust of the connecting pipe 2, the fourth conical surface 34 is in close contact with the second conical surface 121. At the same time, the contact between the fourth conical surface 34 and the second conical surface 121 can also hold the rubber sealing ring 3 in place, preventing it from falling off. When the fifth conical surface 35, the sixth conical surface 36, and the seventh conical surface 37 are subjected to the axial thrust, in addition to being subjected to axial compression, the axial thrust can also generate a radial component force in the radial direction, thereby strengthening the second and third seals and further ensuring the sealing performance of the connector.

[0030] In this embodiment, heating resistance wires 4 are provided on the inner walls of the sleeves 1 located on both sides of the retaining ring 11. The heating resistance wires 4 are connected to the electrofusion connection posts 5 outside the sleeves 1. Furthermore, the wall thickness of the sleeves 1 gradually increases from the end to the middle, thereby ensuring the structural strength of the sleeves 1. Therefore, the connector has a triple sealing effect. Combined with the heat fusion sealing effect of the heating resistance wires 4, the sealing performance of the connector is improved. At the same time, the connector is not affected in terms of water flow, thereby improving the practicality of the connector.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A composite pipe connector, characterized in that: The device includes a sleeve, a connecting pipe, and a rubber sealing ring. The inner wall of the sleeve has an annular groove, and a radially inwardly protruding retaining ring is provided at the bottom of the groove. An annular groove is formed between the outer wall of the retaining ring and the corresponding groove wall, and the rubber sealing ring is engaged within the annular groove. A sealing groove is formed on the side of the rubber sealing ring away from the retaining ring. The connecting pipe is fitted inside the sleeve, and a first abutting surface is provided on the end of the connecting pipe near the rubber sealing ring. The first abutting surface abuts against the sealing groove. The retaining ring has a first conical surface and a vertical surface on both its left and right sides. The two side walls of the annular groove are outwardly flared second conical surfaces. The corresponding first conical surface, the vertical surface, the bottom of the annular groove, and the second conical surface form a sealing groove. The outer wall of the rubber sealing ring is the retaining surface, the side wall near the vertical surface is the second abutting surface, and the inner wall of the rubber sealing ring is a third conical surface. The second contact surface abuts against the bottom of the annular groove, the third conical surface abuts against the first conical surface, and the rubber sealing ring is further provided with a fourth conical surface on the side away from the retaining ring. The fourth conical surface is located outside the sealing groove and is in contact with the second conical surface. The sealing groove includes a fifth conical surface, a sixth conical surface, and a seventh conical surface. The angle between the fifth and sixth conical surfaces is obtuse, the angle between the sixth and seventh conical surfaces is obtuse, the angle between the fifth and fourth conical surfaces is acute, and the angle between the third and seventh conical surfaces is acute. An eighth, ninth, and tenth conical surface are provided on the end of the connecting pipe near the retaining ring. The eighth conical surface is in close contact with the fifth conical surface, the ninth conical surface is in close contact with the sixth conical surface, and the tenth conical surface is in close contact with the seventh conical surface. The wall thickness of the sleeve gradually increases from the end to the middle.

2. A composite pipe connector according to any one of claims 1, characterized in that: Heating resistance wires are provided on the inner sidewalls of the sleeve located on the left and right sides of the retaining ring, and the heating resistance wires are connected to the electrofusion connection post outside the sleeve.

3. A composite pipe connector according to claim 2, characterized in that: The inner diameter of the retaining ring is the same as the inner diameter of the connecting pipe.

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