Socket and spigot type different-material multi-layer pipe

Abstract

The utility model discloses a socket and spigot joint type different-material multi-layer pipe, which comprises an inner pipe, a middle layer and an outer pipe which are sequentially sleeved from inside to outside, the outer pipe comprises a socket part, a straight pipe part and a spigot part which are sequentially connected, the inner pipe is made of stainless steel or nonmetal, and a sealing gasket and a stainless steel bushing ring are respectively arranged at two ends of the pipe. At one end of the socket part, the sealing gasket wraps the end of the straight pipe part, the end of the middle layer, the end of the inner pipe and the inner wall of one end of the inner pipe, at one end of the spigot part, the sealing gasket wraps the end of the spigot part, the end of the middle layer, the end of the inner pipe and the inner wall of the other end of the inner pipe, and the bushing ring covers and presses the sealing gasket and extends to make contact with the inner wall of the inner pipe. The stainless steel bushing rings and the rubber sealing gaskets at the ends of the pipe prevent the ends from being in contact with water to be stripped, and the inner wall of the metal outer pipe is prevented from being rusted to pollute water; the lining ring and the sealing gasket play a role in fixing the inner pipe, the lining ring extends to the inner wall of the inner pipe, no step is formed, and water flow resistance generated by the step is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipes, in particular to a socket-and-spigot type heterogeneous material multilayer pipe. Background Art

[0002] Composite pipes are widely used pipes, often used in liquid transportation pipe network systems. They are generally of a spigot-and-socket structure, including an outer metal pipe and an inner plastic pipe, that is, the plastic pipe is used as an inner liner, one end of the metal pipe is a spigot end, and the other end is a bell end. During installation, multiple composite pipes are connected in sequence, and the spigot end of a composite pipe is inserted into the bell end of the adjacent composite pipe. Lining rings, compressed linings and end faces are respectively provided at both ends of the composite pipe. The lining rings at both ends are used to press the plastic pipes at the spigot end and the bell end onto the metal pipe and cover the end faces to prevent the end faces of the composite pipes from being eroded for a long time during use and causing delamination. However, the lining ring and the lining are independent, and one end of the lining ring is pressed on the surface of the lining to form a step. Under the long-term erosion of the liquid, the lining ring is at risk of loosening or even falling off. The transported liquid may penetrate into the end face of the composite pipe through the loose lining ring, polluting the quality of the transported liquid. The steps formed by the lining ring cause an increase in the local water flow resistance in the pipeline. Utility Model Content

[0003] In view of the above problems existing in the prior art, the purpose of the utility model is to provide a socket-and-spigot type heterogeneous material multi-layer pipe, stainless steel lining rings and rubber sealing pads are arranged at the ends of the pipes to prevent the ends of the layers of materials from coming into contact with water and peeling, and to prevent the inner wall of the metal outer pipe from rusting and peeling to cause water pollution; the lining ring and the sealing pad play a fixing role on the inner pipe, and in the case of seal failure and complete stratification of the inner lining, the inner lining can still be protected from being washed away by the scouring of the water flow; the arrangement of the lining ring and the sealing pad enhances the ring stiffness of the pipe port, the socket is not easy to deform, and the installation of the pipe is convenient, and the uniform sealing effect of the sealing pad and the sealing ring at the connection between the two pipes is improved, and pipeline leakage is reduced. The lining ring covers the sealing pad and extends to the inner wall of the inner pipe, the connection between the inner pipe and the lining ring is smooth and smooth, and there is no step with a height difference between the lining ring and the inner pipe, which reduces the water flow resistance caused by the step, and the pipe has higher water conveyance efficiency and lower operating energy consumption.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A socket-and-spigot type heterogeneous material multi-layer pipe comprises an inner pipe, an intermediate layer and an outer pipe which are sequentially sleeved from the inside to the outside, the outer pipe comprises a socket portion, a straight pipe portion and a spigot portion which are sequentially connected, the inner pipe is made of stainless steel or non-metal, and a sealing gasket and a liner ring made of stainless steel are respectively provided at both ends of the pipe, at one end of the socket portion, the sealing gasket covers the end of the straight pipe portion, the end of the intermediate layer, the end of the inner pipe and the inner wall of one end of the inner pipe, at one end of the spigot portion, the sealing gasket covers the end of the spigot portion, the end of the intermediate layer, the end of the inner pipe and the inner wall of the other end of the inner pipe, and the liner ring covers and compresses the sealing gasket and extends to contact the inner wall of the inner pipe.

[0006] As a further improvement of the above technical solution:

[0007] When the inner tube is made of non-metal, the liner ring extends to contact the inner tube and presses the inner wall of the inner tube.

[0008] When the inner tube is made of stainless steel, the liner ring extends to contact the inner tube and presses the inner wall of the inner tube, or the liner ring extends to contact the inner tube and is welded to the inner tube.

[0009] The weld between the liner ring and the inner tube is circumferentially arranged along the inner wall of the inner tube.

[0010] The material of the middle layer is hot melt adhesive, plastic or rubber.

[0011] At one end of the socket part, the end of the inner tube, the end of the middle layer and the end of the straight tube part are all flush; at one end of the spigot part, the end of the inner tube, the end of the middle layer and the end of the spigot part are all flush.

[0012] The sealing gasket includes an integrally connected sealing gasket pressure edge and a sealing gasket flange, the sealing gasket pressure edge is cylindrical, and the sealing gasket flange is annular, at one end of the socket part, the sealing gasket pressure edge fits the inner surface of one end of the inner tube, the sealing gasket flange fits the end face of one end of the inner tube, the end face of one end of the middle layer and the end face of one end of the straight tube part, at one end of the socket part, the sealing gasket pressure edge fits the inner surface of the other end of the inner tube, the sealing gasket flange fits the end face of the other end of the inner tube, the end face of the other end of the middle layer and the end face of the plug part.

[0013] The liner ring includes an integrally connected liner ring pressure edge and a liner ring flange. The liner ring pressure edge is cylindrical, and the liner ring flange is annular. The liner ring flange fits and presses the sealing gasket flange. The liner ring pressure edge fits, presses and covers the sealing gasket pressure edge. One end of the liner ring pressure edge is connected to the liner ring flange, the middle part contacts and presses the sealing gasket pressure edge, and the other end extends to the inner surface of the inner tube to contact the inner wall of the inner tube.

[0014] The thickness of the inner tube shall not be less than 0.1mm.

[0015] The beneficial effects of the utility model are:

[0016] (1) Stainless steel lining rings and rubber gaskets are set at the ends of the pipes to seal the two ends of the pipes, prevent the ends of the layers of materials from contacting water and peeling off due to the tension of water, and prevent the inner wall of the metal outer pipe from rusting and peeling off to cause water pollution; the lining rings and gaskets fix the inner pipe, and when the seal fails and the inner lining is completely delaminated, they can still protect the inner lining from being washed away by the scouring of water flow; the setting of lining rings and gaskets enhances the ring stiffness of the pipe port, the socket is not easy to deform, and it is convenient for the installation of the pipe, and improves the uniform sealing effect of the gasket and the sealing ring at the connection between the two pipes, thereby reducing pipeline leakage.

[0017] (2) The liner ring covers the sealing gasket and extends to the inner wall of the inner pipe. The connection between the inner pipe and the liner ring is smooth and there is no step with a height difference between the liner ring and the inner pipe, which reduces the water flow resistance caused by the step, improves the water conveying efficiency of the pipe, and reduces the operating energy consumption.

[0018] (3) When the inner pipe is made of stainless steel, it has a better anti-corrosion effect, prolongs the service life of the pipe, avoids the rust of the outer pipe to pollute the water quality, and improves the liquid transportation performance. Compared with the plastic pipe lining, it eliminates the inner surface wrinkles and uneven defects caused by the melting of the lining plastic during compounding, improves the flatness of the inner surface of the pipe, and the lining thickness is small, which improves the water transportation efficiency of the pipeline and reduces the operating energy consumption.

[0019] (4) When the inner tube is made of stainless steel, the liner ring can be welded to the inner tube, which further improves the sealing effect of the liner ring and the function of stabilizing the inner tube.

[0020] (5) The middle layer is made of insulating hot melt adhesive, plastic or rubber, which completely separates the inner tube from the outer tube to prevent the outer tube from contacting the stainless steel inner tube and causing electrochemical corrosion to the inner tube. At the same time, it eliminates the uneven glue layer caused by the flow of ordinary liquid glue in the middle layer, and the electrochemical corrosion caused by the direct contact between the inner lining stainless steel and the outer metal tube without bonding. It also overcomes the problems of easy aging and poor insulation of ordinary glue.

[0021] (6) When the middle layer is hot melt adhesive, the hot melt adhesive will bond the inner and outer layers together to prevent the negative pressure in the pipeline from causing the inner lining to be delaminated. When the middle layer is rubber, the elasticity of the rubber will cause the metal outer tube and the stainless steel inner tube to form a mutual elastic force, which has good sealing performance for the inner wall of the metal tube and can prevent the liquid from contacting the inner wall of the metal outer tube and causing corrosion of the tube wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the pipe structure in which the liner ring and the inner pipe are in contact but not welded.

[0023] Figure 2 yes Figure 1 An enlarged schematic diagram of point A.

[0024] Figure 3 yes Figure 1 An enlarged schematic diagram of point B.

[0025] Figure 4 The utility model is a schematic diagram of the pipe structure of the liner ring and the stainless steel inner pipe welded together.

[0026] Figure 5 yes Figure 4 Enlarged schematic diagram of point C.

[0027] Figure 6 yes Figure 4 Enlarged schematic diagram of point D. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0029] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0030] A socket-and-spigot type heterogeneous material multilayer pipe, such as Figures 1 to 6 As shown, it includes an inner tube 2, an intermediate layer 3 and an outer tube 1 which are sequentially sleeved from the inside to the outside. The inner tube 2 and the outer tube 1 are bonded by the intermediate layer 3 or the inner tube 2 presses the intermediate layer 3 onto the inner wall of the outer tube 1.

[0031] The material of the outer tube 1 is metal. Preferably, the material of the outer tube 1 is ductile iron or carbon steel. The outer tube 1 includes a socket portion 11, a straight tube portion 12 and a socket portion 13 which are sequentially connected along the axial direction thereof. The three are integrally cast, or the straight tube portion 12 and the socket portion 13 are integrally formed as a pipe body, and the pipe body and the socket portion 11 are manufactured separately and then welded together. The straight tube portion 12 and the socket portion 13 are both cylindrical, and the socket portion 13 is provided with chamfers along the circumferential direction. The inner diameter, outer diameter and thickness of the straight tube portion 12 are respectively equal to the inner diameter, outer diameter and thickness of the socket portion 13.

[0032] The inner surface of the socket portion 11 is provided with steps or grooves. When the two pipes are connected, the socket portion 13 of one pipe is inserted into the socket portion 11 of the adjacent pipe and sealed. In this embodiment, the inner wall of the socket portion 11 is provided with steps, wherein the inner wall of the step closest to the straight pipe portion 12 is the outer side surface of a truncated cone, that is, from the socket portion 11 toward the straight pipe portion 12, the inner diameter of the step gradually increases, which is equivalent to a bell mouth. This setting is to provide a deflection angle for the adjacent multi-layer pipe connected thereto, that is, to allow the center line of a multi-layer pipe and the center line of the adjacent multi-layer pipe connected thereto to be in an intersecting state, rather than an overlapping state, in order to allow a certain installation error and facilitate actual operation.

[0033] The inner tube 2 serving as the liner is made of polyethylene or stainless steel and has a cylindrical shape.

[0034] The material of the middle layer 3 is hot melt adhesive, plastic or rubber. When the material of the middle layer 3 is hot melt adhesive, the hot melt adhesive has adhesive properties, and the inner tube 2 and the outer tube 1 are bonded together through the middle layer 3; when the material of the middle layer 3 is plastic or rubber, the plastic or rubber does not have adhesive properties, and the inner tube 2 presses the middle layer 3 against the inner wall of the outer tube 1.

[0035] The length of the inner tube 2, the length of the intermediate layer 3 and the length of the tube body (the straight tube portion 12 and the socket portion 13) are equal. At one end of the socket portion 11, the end of the inner tube 2, the end of the intermediate layer 3 and the end of the straight tube portion 12 are flush; at one end of the socket portion 13, the end of the inner tube 2, the end of the intermediate layer 3 and the end of the socket portion 13 are flush.

[0036] The thickness of the inner tube 2 should not be too large or too small. If the thickness is too large, it will obviously reduce the liquid flow under the outer tube 1. If the thickness is too small, the welding strength of the inner tube 2 is insufficient and the overall deformation is large. The main function of the inner tube 2 is corrosion protection. A large number of welding tests have shown that under the conditions of fiber laser welding technology, a stainless steel plate with a minimum wall thickness of 0.1mm can obtain a weld with high welding strength and small deformation.

[0037] When the middle layer 3 is a hot melt adhesive, it melts when compounded. When the inner wall of the outer tube 1 is rough, the middle layer melts when heated to fill the pits on the inner wall of the outer tube 1. If the thickness of the middle layer 3 is too small, poor adhesion is likely to occur in areas with large local roughness. At the same time, the middle layer 3 also serves as an insulating layer and requires a certain thickness to produce an insulating effect between the outer tube 1 and the inner tube 2. The electric spark test and the peel strength test show that when the thickness of the middle layer 3 is not less than 0.2 mm, good peel strength and insulation performance can be stably obtained.

[0038] When the material of the middle layer 3 is plastic and rubber, only the insulation is considered, and the bonding strength does not need to be considered. The electric spark test shows that when the thickness of the middle layer 3 is not less than 0.2 mm, a good insulation performance can be stably obtained.

[0039] Therefore, the thickness range of the inner tube 2 is not less than 0.1 mm, that is, the minimum thickness of the inner tube 2 is 0.1 mm. The thickness of the intermediate layer 3 is not less than 0.2 mm.

[0040] A lining ring 5 and a sealing gasket 4 are provided at one end of the socket portion 13 of the pipe, and a lining ring 5 and a sealing gasket 4 are also provided at one end of the socket portion 11. The lining ring 5 is made of stainless steel, and the sealing gasket 4 is made of rubber. The sealing gasket 4 at one end of the socket portion 13 is used to cover and compress the end face and inner wall of the socket portion 13 of the pipe, and the lining ring 5 compresses the sealing gasket 4 and extends to the inner tube 2 to contact the inner tube 2 to prevent the formation of steps. Similarly, the sealing gasket 4 at one end of the socket portion 11 is used to cover and compress the end face and inner wall of the straight tube portion 12 of the pipe close to one end of the socket portion 11, and the lining ring 5 compresses the sealing gasket 4 and extends to the inner tube 2 to contact the inner tube 2 to prevent the formation of steps.

[0041] like Figure 2 , 3 As shown in Figures 5 and 6, the gasket 4 includes a gasket pressing edge 41 and a gasket flange 42. The gasket pressing edge 41 and the gasket flange 42 are connected as one piece. The gasket pressing edge 41 can be regarded as a thin cylindrical shape. The gasket flange 42 is annular. The inner diameter of the gasket flange 42 is equal to the inner diameter of the gasket pressing edge 41, and the outer diameter of the gasket flange 42 is greater than the outer diameter of the gasket pressing edge 41. The gasket pressing edge 41 and the gasket flange 42 share a common center line.

[0042] The structure of the liner ring 5 is similar to that of the gasket 4. The liner ring 5 includes an integrally connected liner ring pressure edge 51 and a liner ring flange 52. The liner ring pressure edge 51 can be regarded as a thinner cylinder, and the inner diameters of the cylinder are not completely equal. The liner ring flange 52 is annular. The inner diameter of the liner ring flange 52 is substantially equal to the inner diameter of the liner ring pressure edge 51, and the outer diameter of the liner ring flange 52 is greater than the outer diameter of the liner ring pressure edge 51. The liner ring pressure edge 51 and the liner ring flange 52 share a common center line.

[0043] At one end of the socket portion 11, the outer surface of the sealing gasket edge 41 of the sealing gasket 4 fits the inner surface of one end of the inner tube 2, and the inner surface of the sealing gasket edge 41 fits the outer surface of the liner ring edge 5. One side of the sealing gasket flange 42 fits the end face of the inner tube 2, the end face of the intermediate layer 3 and the end face of the straight tube portion 12, and the other side of the sealing gasket flange 42 fits the liner ring flange 52.

[0044] At one end of the socket 13, the outer surface of the sealing gasket edge 41 of the sealing gasket 4 fits the inner surface of the other end of the inner tube 2, and the inner surface of the sealing gasket edge 41 fits the outer surface of the liner 5. One side of the sealing gasket flange 42 fits the end surface of the inner tube 2, the end surface of the intermediate layer 3 and the end surface of the socket 13, and the other side of the sealing gasket flange 42 fits the liner flange 52.

[0045] Furthermore, the liner ring flange 52 fits and presses the gasket flange 42, the liner ring press 51 fits, presses and covers the gasket press 41, one end of the liner ring press 51 is connected to the liner ring flange 52, the middle part contacts and presses the gasket press 41, and the other end extends to the inner surface of the inner tube 2 to contact the inner wall of the inner tube 2. In this way, it is avoided that the liner ring 5 and the inner wall of the inner tube 2 do not contact to form a step with a height difference.

[0046] When the inner tube 2 is made of stainless steel, the liner ring edge 51 contacts the inner surface of the inner tube 2 or the liner ring edge 51 and the inner tube 2 are welded together, and the welding point E (weld) is located on the inner surface of the inner tube 2, and the weld is circumferentially along the inner surface of the inner tube 2.

[0047] Finally, it is necessary to explain here that the above embodiments are only used to further illustrate the technical solution of the utility model in detail and cannot be understood as limiting the protection scope of the utility model. Some non-essential improvements and adjustments made by technicians in this field based on the above content of the utility model belong to the protection scope of the utility model.

Claims

1. A socket-and-spigot type heterogeneous material multilayer pipe, characterized in that: The invention comprises an inner tube (2), an intermediate layer (3) and an outer tube (1) which are sleeved in sequence from the inside to the outside. The outer tube (1) comprises a socket portion (11), a straight tube portion (12) and a plug portion (13) which are connected in sequence. The inner tube (2) is made of stainless steel or non-metal. A sealing gasket (4) and a liner ring (5) made of stainless steel are respectively provided at both ends of the tube. At one end of the socket portion (11), the sealing gasket (4) covers the end of the straight tube portion (12), the end of the intermediate layer (3), the end of the inner tube (2) and the inner wall of one end of the inner tube (2). At one end of the plug portion (13), the sealing gasket (4) covers the end of the plug portion (13), the end of the intermediate layer (3), the end of the inner tube (2) and the inner wall of the other end of the inner tube (2). The liner ring (5) covers and presses the sealing gasket (4) and extends to contact the inner wall of the inner tube (2).

2. The multilayer tube according to claim 1, characterized in that: When the material of the inner tube (2) is non-metallic, the liner ring (5) extends until it contacts the inner tube (2) and presses the inner wall of the inner tube (2).

3. The multilayer tube according to claim 1, characterized in that: When the inner tube (2) is made of stainless steel, the liner ring (5) extends to contact the inner tube (2) and presses the inner wall of the inner tube (2), or the liner ring (5) extends to contact the inner tube (2) and is welded to the inner tube (2).

4. The multilayer tube according to claim 3, characterized in that: The weld between the liner ring (5) and the inner tube (2) is formed along the circumference of the inner wall of the inner tube (2).

5. The multilayer tube according to claim 1, characterized in that: The material of the middle layer (3) is hot melt adhesive, plastic or rubber.

6. The multilayer tube according to claim 1, characterized in that: At one end of the socket portion (11), the end of the inner tube (2), the end of the middle layer (3) and the end of the straight tube portion (12) are all flush with each other; at one end of the socket portion (13), the end of the inner tube (2), the end of the middle layer (3) and the end of the socket portion (13) are all flush with each other.

7. The multilayer pipe according to any one of claims 1 to 6, characterized in that: The sealing gasket (4) comprises a sealing gasket pressing edge (41) and a sealing gasket flange (42) which are integrally connected. The sealing gasket pressing edge (41) is cylindrical, and the sealing gasket flange (42) is annular. At one end of the socket portion (11), the sealing gasket pressing edge (41) fits the inner surface of one end of the inner tube (2), and the sealing gasket flange (42) fits the end face of one end of the inner tube (2), the end face of one end of the middle layer (3), and the end face of one end of the straight tube portion (12). At one end of the socket portion (11), the sealing gasket pressing edge (41) fits the inner surface of the other end of the inner tube (2), and the sealing gasket flange (42) fits the end face of the other end of the inner tube (2), the end face of the other end of the middle layer (3), and the end face of the plug portion (13).

8. The multilayer tube according to claim 7, characterized in that: The liner ring (5) comprises an integrally connected liner ring pressure edge (51) and a liner ring flange (52); the liner ring pressure edge (51) is cylindrical, the liner ring flange (52) is annular, the liner ring flange (52) fits and presses the sealing gasket flange (42), the liner ring pressure edge (51) fits, presses and covers the sealing gasket pressure edge (41), one end of the liner ring pressure edge (51) is connected to the liner ring flange (52), the middle part contacts and presses the sealing gasket pressure edge (41), and the other end extends to the inner surface of the inner tube (2) to contact the inner wall of the inner tube (2).

9. The multilayer tube according to claim 1, characterized in that: The thickness of the inner tube (2) is not less than 0.1 mm.

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