CN218118924U - Composite pipe - Google Patents

Abstract

The utility model relates to a composite pipe field discloses a composite pipe, including body and neck bush, the neck bush peg graft in the tip of body, the outer wall of neck bush with the inner wall of the tip of body is laminated mutually, and the neck bush plays the supporting role to the inner wall of body end, restricts the deformation of body end inner wall for the unable deformation of the inner wall of composite pipe melting part after the electric smelting heating. In addition, compound pipe melting in-process, owing to compound pipe volume inflation produced inflation pressure has destroyed the complex of enhancement layer and compound inside pipe layer, and compound pipe is at the melting in-process, and the neck bush has restricted the deformation of compound inside pipe layer, leads to compound inside pipe layer can't break away from with the enhancement layer for compound pipe after the electric smelting heating can resume original shape and the performance of tubular product, consequently, the utility model discloses a function that the body was non-deformable and can keep compound pipe original performance after the heating.

Description

Composite pipe

Technical Field

The utility model belongs to the technical field of compound pipe, specifically speaking relates to a compound pipe.

Background

At present, with the development of the pipeline industry and the improvement of the requirements on a pipe network, a composite pipe with a reinforcing layer is produced, and the composite pipe has the advantages of strong structural designability, strong bearing capacity, good corrosion resistance, excellent wear resistance, high cost performance, light weight, convenience in transportation and installation and the like. Composite pipes are often used for long distance fluid transport due to their numerous advantages as described above. The length of pipe required for long distance transportation is long, and in production, the length of produced pipe is limited, so that a plurality of pipes need to be connected together in sequence. At present, composite pipe connection usually adopts electric melting connection. The electric melting connection is that the pipe orifices of two composite pipes are inserted into a special electric melting pipe fitting with an embedded resistance wire, and the two pipe orifices are melted by electrifying and heating, and the melting sections are fused together and connected into a whole after cooling. However, the electric melting connection may cause the deformation of the inner wall of the pipe orifice of the composite pipe, and the deformation of the inner wall is large after the melting because the inner wall is not supported, so that the original shape and performance of the pipe are difficult to recover after the electric melting is finished. The composite pipe is sequentially provided with a composite pipe inner layer, a reinforcing layer and a composite pipe outer layer from inside to outside, and the reinforcing layer is respectively compounded with the composite pipe inner layer and the composite pipe outer layer.

Chinese patent CN113074283A (published as 2021, 07/06/10) discloses a heat-resistant steel wire mesh framework PE composite pipe, which comprises a PE inner pipe, a steel wire mesh framework coated with modified bonding resin, and a PE outer pipe, which are sequentially nested from inside to outside. The composite pipe of the patent mainly adopts thermal compounding during production, the composite pipe in a melting area part can be heated for the second time during electric melting connection, so that the inner wall is deformed, the compounding among a steel wire mesh framework, a PE inner pipe and a PE outer pipe of the composite pipe after electric melting heating is damaged due to the existence of a reinforcing layer (such as a steel wire mesh framework), and the original shape and performance of the heat-resistant steel wire mesh framework PE composite pipe are difficult to recover after electric melting is finished.

Disclosure of Invention

The utility model aims at providing a heating non-deformable's compound pipe.

In order to realize the technical purpose, the utility model provides a composite pipe, including body and neck bush, the neck bush peg graft in the tip of body, the outer wall of neck bush with the inner wall of the tip of body laminates mutually.

Further, the inner bush is a steel inner bush.

Furthermore, the inner wall of the end of the pipe body is recessed outwards to form a step, the distance from the step to the pipe orifice of the pipe body is equal to the length of the inner bushing, one end face of the inner bushing abuts against the step face of the step, and the width of the step along the radial direction of the pipe body is equal to the thickness of the inner bushing.

Further, the body includes first plastic layer, enhancement layer and second plastic layer, first plastic layer the enhancement layer with second plastic layer from interior to exterior sets gradually, the step is located first plastic layer.

Further, the inner bushing and the pipe body are subjected to hot-melt riveting.

The pipe body is characterized by further comprising a blocking piece, the blocking piece is located on the outer side of the pipe body, one end of the blocking piece is connected with the inner lining, the blocking piece abuts against the end face of the pipe body, and the length of the blocking piece in the radial direction of the pipe body is smaller than the wall thickness of the pipe body.

Further, the baffle plate extends to form an annular structure along the circumferential direction of the inner bushing.

Further, the length of the baffle plate along the radial direction of the pipe body is half of the wall thickness of the pipe body.

Furthermore, an outside-in chamfer is arranged at one end, away from the pipe orifice of the pipe body, of the inner bushing.

Furthermore, the surface of the inner lining is provided with an anti-corrosion material layer.

Compared with the prior art, its beneficial effect lies in:

the utility model provides a heating non-deformable's compound pipe, the neck bush is pegged graft in the tip of compound pipe body, and the outer wall of neck bush is laminated with the inner wall of body tip mutually, and the neck bush plays the supporting role to the inner wall of body tip, restricts the deformation of body tip inner wall for the inner wall and the enhancement layer of compound pipe melting part among the electric smelting heating process can not warp because of expend with heat and contract with cold effect. Furthermore, in the fusion process of composite pipe, because the produced expansion pressure of composite pipe volume expansion leads to composite pipe inner layer and enhancement layer to break away from, has destroyed the complex of enhancement layer and composite pipe inner layer, and composite pipe is in the fusion process, because the neck bush plays the supporting role to the inner wall of body tip, and the distance between neck bush and the enhancement layer is fixed for in the fusion process of composite pipe, the neck bush has restricted the deformation of composite pipe inner layer, leads to composite pipe inner layer can't break away from with the enhancement layer, has guaranteed the complex of enhancement layer and composite pipe inner layer, makes composite pipe after the electric smelting heating can resume original shape and the performance of tubular product, consequently, the utility model discloses a tubular body is after the heating function that non-deformable and non-deformable can keep composite pipe original performance.

Drawings

Fig. 1 is a schematic structural view of a composite pipe according to an embodiment of the present invention.

In the figure, 100, a tube; 110. a first plastic layer; 120. an enhancement layer; 130. a second plastic layer; 200. an inner liner; 210. chamfering; 220. a layer of corrosion resistant material; 300. a step; 400. a baffle plate.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The first embodiment is as follows:

as shown in fig. 1, the composite tube of the preferred embodiment of the present invention comprises a tube body 100 and an inner bushing 200, wherein the inner bushing 200 is inserted into the end of the composite tube 100, the outer wall of the inner bushing 200 is attached to the inner wall of the end of the tube body 100, the inner bushing 200 supports the inner wall of the end of the tube body 100, and limits the deformation of the inner wall of the end of the tube body 100, so that the inner wall and the reinforcing layer of the composite tube melting portion in the electric melting heating process do not deform due to the expansion and contraction. Furthermore, in the fusion process of composite pipe, because the produced expansion pressure of the volume expansion of composite pipe leads to composite pipe inlayer and enhancement layer 120 to break away from, has destroyed the complex of enhancement layer 120 and composite pipe inlayer, and composite pipe is in the fusion process, because bush 200 plays the supporting role to the inner wall of the tip of body 100, and the distance between bush 200 and the enhancement layer 120 is fixed for in the composite pipe fusion process, bush 200 has restricted the deformation of composite pipe inlayer, leads to the unable and enhancement layer 120 of composite pipe to break away from, has guaranteed the complex of enhancement layer 120 and composite pipe inlayer, makes composite pipe after the electric smelting heating can resume original shape and the performance of tubular product, consequently, the utility model discloses a body 100 is non-deformable after the heating and can keep the function of the original performance of composite pipe. The inner liner 200 of the present embodiment is a steel inner liner, and is a cylindrical structure made of steel, the melting point of steel is much higher than that of the composite pipe body 100, and the inner liner 200 is not deformed by heat when the composite pipe is heated and fused, so that the inner liner 200 can support the pipe body 100 when the composite pipe is heated and fused.

Further, in this embodiment, the inner wall of the end of the tube 100 is recessed outward to form a step 300, the distance from the step 300 to the nozzle of the tube 100 is equal to the length of the inner bushing 200, one end surface of the inner bushing 200 abuts against the step surface of the step 300, and the width of the step 300 along the radial direction of the tube 100 is equal to the thickness of the inner bushing 200, so that the end of the tube 100 from the port to the step is completely supported by the inner bushing 200, the inner diameter of the portion of the tube 100 inserted with the inner bushing 200 is equal to the inner diameter of the portion of the tube 100 not inserted with the inner bushing 200, thereby preventing the inner diameter of the tube 100 from being changed due to the insertion of the inner bushing 200 at the end of the tube 100, preventing the friction resistance of the fluid in the tube due to the increase of the inner diameter of the tube 100 and the pressure of the fluid in the tube on the tube 100, reducing the head loss and the loss on the tube 100, and reducing the influence of the composite tube on the original shape and performance of the tube due to the insertion of the inner bushing 200 at the end of the tube 100.

Further, the tube 100 of the present embodiment includes a first plastic layer 110, a reinforcing layer 120 and a second plastic layer 130, the first plastic layer 110, the reinforcing layer 120 and the second plastic layer 130 are sequentially disposed from inside to outside, the step 300 is disposed on the first plastic layer 110, that is, the thickness of the inner lining 200 is much smaller than that of the first plastic layer 110, generally speaking, the reinforcing layer 120 is generally made of a metal material with higher strength, common reinforcing layers include a seamless steel tube, a mesh steel strip and a steel wire skeleton, the thickness of the first plastic layer is about 80 mm or more, and the thickness of the inner lining 200 is about 1-5 mm. In the present embodiment, the first plastic layer 110 is an inner layer of the composite pipe, and the second plastic layer 130 is an outer layer of the composite pipe.

The second embodiment:

the difference between the present embodiment and the first embodiment is that, on the basis of the first embodiment, the composite tube of the present embodiment further includes a baffle 400.

In this embodiment, the baffle 400 is located outside the tube 100, one end of the baffle 400 is connected to the inner liner 200, the baffle 400 abuts against the end surface of the tube 100, and the length of the baffle 400 along the radial direction of the tube 100 is smaller than the wall thickness of the tube 100. As shown in fig. 1, in the present embodiment, the baffle 400 extends in a ring-shaped configuration along the circumferential direction of the inner liner 200. Separation blade 400 is connected with interior bush 200, when interior bush 200 inserts body 100, because the distance between separation blade 400 and the central axis of body 100 is greater than the internal diameter of body 100, so separation blade 400 can't insert in body 100, separation blade 400 can support on the terminal surface of body 100, thereby make separation blade 400 can prescribe a limit to interior bush 200 the position in body 100, make the port of interior bush 200 and the mouth of pipe parallel and level of body 100, have the positioning action to interior bush 200, can avoid interior bush 200 to insert the inside of body 100 too deeply, thereby prevent that interior bush 200 from inserting the body 100 back, the body 100 port still has one section part not laminated with interior bush 200, in the electric smelting heating process, the problem that the inner wall of this part body 100 takes place the deformation.

The length of the baffle 400 along the radial direction of the pipe body 100 is only smaller than the wall thickness of the pipe body 100, the end face of the pipe body 100 is provided with a part which is not contacted with the baffle 400, and when two composite pipes are butted after being melted, the part, which is not contacted with the baffle 400, of the end face of the pipe body 100 can be contacted and connected together, so that the connection of the composite pipes is not hindered by the existence of the baffle 400, and the two composite pipes are connected together in an electric melting mode. Preferably, the length of the baffle 400 along the radial direction of the pipe body 100 is half of the wall thickness of the pipe body 100, and the baffle 400 with the length can avoid the defect that the inner lining 200 is difficult to limit due to too short length of the baffle 400, and can also avoid the problem that the connection firmness is poor due to too small area of fusion connection when the composite pipe is fused due to too long length of the baffle 400.

In addition, after the pipe bodies 100 of the two composite pipes are connected in a melting mode, the connection positions of the pipe bodies 100 of the two composite pipes are formed in a cooling mode, and the two baffle plates 400 are located in the connection positions of the two composite pipes, so that the baffle plates 400 are fixed, the inner lining 200 cannot be driven to move by the flowing of fluid when the composite pipes are used, and the inner lining 200 is further fixed. Moreover, the baffle plate 400 is arranged in the joint of the two composite pipes, and the strength of the baffle plate 400 is obviously higher than that of the plastic layer of the composite pipe, so that the strength and the rigidity of the joint of the two composite pipes can be enhanced by the baffle plate 400.

Example three:

the difference between the present embodiment and the second embodiment is that, on the basis of the second embodiment, the connection between the inner liner 200 and the pipe body 100 is further described in the present embodiment.

In this embodiment, the inner liner 200 and the pipe body 100 are heat-fusion-riveted. The hot melting riveting process specifically comprises the following steps: before the inner bushing 200 is installed, a step 300 is machined at the end of the pipe body 100 by turning, the machining depth of the step 300 is generally the sum of the thickness of the inner bushing 200 and the machining allowance, the machining allowance is generally smaller than the thickness of the inner bushing 200, when the thickness of the inner bushing 200 is 1-5 mm, the machining allowance is generally 0.1-1 mm, then the inner wall of the pipe body 100 is heated by the heating sleeve, and a machining person can select a corresponding heating sleeve according to the inner diameter of the pipe body 100 before machining. After the inner wall of the tube 100 is melted, the heating sleeve is pulled out and quickly inserted into the inner liner 200 until the stopper 400 abuts against the mouth of the tube 100. And then, cooling the pipe body 100 to solidify and form the inner wall of the molten pipe body 100, and milling off the rubber materials overflowing from the step 300 and the baffle 400, so that the inner diameter of the pipe body 100 is kept unchanged and the wall of the composite pipe is kept smooth. In this embodiment, the position of the inner liner 200 in the tube 100 can be limited by the stop piece 400, so as to avoid the problem that the inner liner 200 is inserted too deeply into the tube 100 because the step surface is in a molten state and cannot abut against the inner liner.

Preferably, before the pipe body 100 is hot-riveted, a corresponding electrofusion pipe fitting is selected according to the outer diameter of the pipe body 100, the length of the fusion zone of the electrofusion pipe fitting is determined, the length of the inner bushing 200 inserted into the pipe body 100 is slightly greater than half of the length of the fusion zone of the electrofusion pipe fitting, and generally, the length of the inner bushing 200 is 1 to 5 millimeters greater than half of the length of the fusion zone of the electrofusion pipe fitting.

Preferably, an outside-in chamfer 210 is arranged at one end of the inner bushing 200 far away from the nozzle of the tube body 100, so that the diameter of the end of the inner bushing 200 provided with the chamfer 210 is smaller than the diameter of the other parts of the inner bushing, and the inner bushing 200 is easy to align with and guide into the tube body 100 when being plugged, thereby reducing the difficulty of installing the inner bushing 200, and particularly reducing the difficulty of installing the inner bushing 200 when the inner wall of the tube body 100 is in a molten state.

Further, the surface of the inner liner 200 is provided with a corrosion prevention material layer 220, so that the inner liner 200 is not corroded by the fluid in the composite pipe, and preferably, an inert metal layer is provided on the inner steel sleeve surface through electroplating, and preferably, silver is electroplated on the inner liner surface.

To sum up, the embodiment of the utility model provides a heating non-deformable's composite tube is proposed, neck bush 200 is pegged graft in the tip of composite tube body 100, and the outer wall of neck bush 200 is laminated with the inner wall of body 100 tip mutually, and neck bush 200 plays the supporting role to the inner wall of body 100 tip, restricts the deformation of body 100 tip inner wall for the inner wall and the enhancement layer of the composite tube melting part among the electric smelting heating process can not warp because of expend with heat and contract with cold effect. Furthermore, in the fusion process of composite pipe, because the produced expansion pressure of the volume expansion of composite pipe leads to composite pipe inlayer and enhancement layer 120 to break away from, has destroyed the complex of enhancement layer 120 and composite pipe inlayer, and composite pipe is in the fusion process, because bush 200 plays the supporting role to the inner wall of the tip of body 100, and the distance between bush 200 and the enhancement layer 120 is fixed for in the composite pipe fusion process, bush 200 has restricted the deformation of composite pipe inlayer, leads to the unable and enhancement layer 120 of composite pipe to break away from, has guaranteed the complex of enhancement layer 120 and composite pipe inlayer, makes composite pipe after the electric smelting heating can resume original shape and the performance of tubular product, consequently, the utility model discloses a body 100 is non-deformable after the heating and can keep the function of the original performance of composite pipe. In addition, the inner wall of the pipe body 100 is provided with the step 300, so that the inner diameter of the part of the pipe body 100, which is inserted with the inner bushing 200, is equal to the inner diameter of the part of the pipe body 100, which is not inserted with the inner bushing 200, the head loss and the loss of the pipe body 100 can be reduced, the influence of the inserted inner bushing 200 on the original shape and performance of the pipe is reduced, the composite pipe of the embodiment further comprises a baffle 400, the position of the inner bushing 200 in the pipe body 100 can be limited, the fixation of the inner bushing 200 in the composite pipe after electric melting is realized, and the strength and the rigidity of the joint of the two composite pipes are enhanced.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims (10)

1. The composite pipe is characterized by comprising a pipe body (100) and an inner lining (200), wherein the inner lining (200) is inserted into the end part of the pipe body (100), and the outer wall of the inner lining (200) is attached to the inner wall of the end part of the pipe body (100).

2. The composite pipe according to claim 1, wherein the inner liner (200) is a steel inner liner.

3. The composite pipe according to claim 1, wherein the inner wall of the end of the pipe body (100) is recessed outward to form a step (300), the distance from the step (300) to the nozzle of the pipe body (100) is equal to the length of the inner liner (200), an end surface of the inner liner (200) abuts against the step surface of the step (300), and the width of the step in the radial direction of the pipe body (100) is equal to the thickness of the inner liner (200).

4. The composite tube according to claim 3, wherein the tube body (100) comprises a first plastic layer (110), a reinforcing layer (120) and a second plastic layer (130), the first plastic layer (110), the reinforcing layer (120) and the second plastic layer (130) are sequentially arranged from inside to outside, and the step (300) is disposed on the first plastic layer (110).

5. The composite pipe according to claim 2, wherein the inner liner (200) and the pipe body (100) are heat-fusion riveted.

6. The composite pipe according to claim 1, further comprising a baffle (400), wherein the baffle (400) is located outside the pipe body (100), one end of the baffle (400) is connected to the inner liner (200), the baffle (400) abuts against an end surface of the pipe body (100), and a length of the baffle (400) in a radial direction of the pipe body (100) is smaller than a wall thickness of the pipe body (100).

7. The composite tube according to claim 6, wherein the flaps (400) extend in a ring-shaped configuration along the circumference of the inner liner (200).

8. The composite tube according to claim 6 or 7, wherein the length of the baffle (400) in the radial direction of the tube body (100) is half the wall thickness of the tube body (100).

9. The composite pipe according to claim 1, wherein the inner liner (200) is provided with an outside-in chamfer (210) at an end thereof remote from the mouth of the pipe body (100).

10. The composite pipe according to claim 1, wherein the surface of the inner liner (200) is provided with a layer (220) of an anti-corrosive material.

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