Steel-plastic composite pressure pipe

Abstract

The utility model relates to the technical field of pressure pipes, in particular to a steel-plastic composite pressure pipe which comprises an inner plastic layer and a first hot melting layer sleeved on the outer wall of the inner plastic layer, a steel pipe layer sleeved on the outer wall of the first hot melting layer, a plurality of protrusions arranged on the outer wall of the steel pipe layer, and a second hot melting layer sleeved on the outer wall of the steel pipe layer. Grooves are formed in the positions, corresponding to the protrusions, of the inner wall of the second hot melting layer, an outer plastic layer is arranged on the outer wall of the second hot melting layer, and reinforcing wires are arranged in the pipe wall of the outer plastic layer. According to the steel-plastic composite pressure pipe, the inner plastic layer and the steel pipe layer are combined, the overall extrusion resistance is improved, the two sides of the steel pipe layer are matched with the first hot melting layer and the second hot melting layer, the steel pipe layer is additionally arranged to be tightly attached to the inner plastic layer and the outer plastic layer, and when pipeline combination connection is conducted, the first hot melting layer and the second hot melting layer are bonded in a hot melting fit mode; and reinforcing wires are matched in the outer plastic layer, so that the toughness of the overall structure is further improved, and the overall service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of pressure pipe technology, specifically a steel-plastic composite pressure pipe. Background Technology

[0002] Steel-plastic composite pressure pipe is a pipe made of welded steel pipe as the middle layer and polypropylene material as the inner and outer layers, which are compounded into one piece by a special hot melt adhesive extrusion molding method.

[0003] The utility model with announcement number CN217519428U discloses a steel-plastic composite pressure pipe, including a main pipe and a protective mechanism. A connecting mechanism for pipe connection is installed on the outer side of the middle part of the main pipe, and the protective mechanism for cold protection is set on the outer surface of the main pipe.

[0004] The above technical solution, through a buffer layer, can give the protective sleeve a certain impact resistance, reducing the possibility of high-pressure damage; through an insulation layer, it can protect against freezing in severe weather, reducing the possibility of pipe damage; through a waterproof layer, it can prevent water seepage; through the first and second heat-resistant layers, both made of heat-resistant polyethylene, it can ensure the pipe's strength while giving it high heat resistance; through the first and second hot melt adhesives, the double-layer fixation can improve the tightness of the stainless steel layer in the overall pipe, reducing the possibility of pipe splitting. However, when used for a long time in the external environment, under pressure, the pipe is prone to deformation and has weak compressive strength. Increasing strength cannot affect the overall assembly and installation fit. Utility Model Content

[0005] The purpose of this utility model is to provide a steel-plastic composite pressure pipe to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A steel-plastic composite pressure pipe includes an inner plastic layer and a first hot-melt layer sleeved on the outer wall of the inner plastic layer. A steel pipe layer is sleeved on the outer wall of the first hot-melt layer. The outer wall of the steel pipe layer has a plurality of protrusions. A second hot-melt layer is sleeved on the outer wall of the steel pipe layer. The inner wall of the second hot-melt layer has grooves corresponding to the protrusions. An outer plastic layer is sleeved on the outer wall of the second hot-melt layer. Reinforcing wires are provided in the pipe wall of the outer plastic layer.

[0008] Furthermore, the inner plastic layer is made of polypropylene, the outer diameter of the inner plastic layer is adapted to the inner diameter of the first hot melt layer, and the outer wall of the inner plastic layer is bonded and fixed to the inner wall of the first hot melt layer.

[0009] The utility model discloses, under the cooperation of inner plastic layer, reduce the solution of inside passing to the influence of the erosion damage of first hot melt layer inner wall, and under the cooperation of first hot melt layer, help adjacent pipeline between hot melt combination connection, first hot melt layer carries out hot melt connection to inside and increases the compactness of bonding combination.

[0010] Specific, the first hot melt layer adopts polyamide mixed resin and is made, and the outer diameter of the first hot melt layer is adapted to the inner diameter of the steel pipe layer, and the outer wall of the first hot melt layer is adhesively fixed with the inner wall of the steel pipe layer.

[0011] The utility model discloses, polyamide mixed resin is convenient for heating and melting and bonding pipeline cooperation, increase plasticity, and the first hot melt layer is adhesively fixed with the steel pipe layer, and the stability of the installation of steel pipe layer is increased.

[0012] Need to explain, the boss is annular and equally spaced distribution, and the boss is integrally formed structure with the steel pipe layer, the steel pipe layer is made of carbon structural steel, and the outer diameter of the steel pipe layer is adapted to the inner diameter of the second hot melt layer.

[0013] The utility model discloses, under the cooperation of multiple bosses, increase the toughness of steel pipe layer structure, help to increase the overall extrusion resistance, the steel pipe layer is made of carbon structural steel, increase overall strength, save manufacturing cost.

[0014] Further, the second hot melt layer is made of polyamide mixed resin, recesses are formed in the inner wall of the second hot melt layer corresponding to the bosses, the width of the inner wall of the recesses is adapted to the width of the outer wall of the bosses, and the bosses are inserted into the recesses.

[0015] The utility model discloses, the boss is inserted into the recess, and the stability of the combination of the steel pipe layer and the second hot melt layer is increased.

[0016] Specifically, the outer diameter of the second hot melt layer is adapted to the inner diameter of the outer plastic layer, the outer plastic layer is adhesively fixed with the second hot melt layer, the reinforcing filaments are in a spiral shape, and the reinforcing filaments are made of carbon structural steel.

[0017] The utility model discloses, under the cooperation of outer plastic layer, further protect the second hot melt layer, and under the cooperation of reinforcing filaments, increase the toughness of outer plastic layer, reduce the damage influence of bending, lose the protection cooperation inside.

[0018] It is worth supplementing that the outer diameter of the outer plastic layer is adapted to the inner diameter of the wear-resistant layer, the hollow area between the inner wall and the outer wall of the wear-resistant layer is a sandwich layer, a woven mesh ring is arranged in the sandwich layer, and the thickness of the woven mesh ring is adapted to the width of the inner wall of the sandwich layer.

[0019] The wear-resistant layer protects the inside, and under the action of the woven mesh ring, the overall structural stability is increased, the outside contact friction loss caused by long-term exposure to the external environment is reduced, and the protection of the inside is lost.

[0020] Compared with the prior art, the utility model has the advantages that:

[0021] 1. The utility model discloses a combination of an inner plastic layer and a steel pipe layer, which increases the overall extrusion resistance, and the steel pipe layer is matched with a first hot melt layer and a second hot melt layer on both sides, which increases the close installation cooperation of the steel pipe layer and the inner plastic layer and the outer plastic layer, and when the pipeline combination connection is carried out, the first hot melt layer and the second hot melt layer are hot melt cooperated and bonded, the close connection is increased, the overall structure toughness is further increased by the cooperation of the reinforcing wire in the outer plastic layer, and the overall service life is prolonged.

[0022] 2. The utility model discloses a wear-resistant layer with a woven mesh ring, which stably protects the internal pipe material, increases the influence of the outer layer contact friction damage caused by long-term exposure to the external environment, stably protects the inside, the steel pipe layer is matched with a plurality of protrusions and grooves on the outer wall, the stability of combination is increased, the extrusion resistance of the steel pipe layer is increased by the cooperation of the plurality of protrusions, and the extrusion deformation influence pipeline transportation is reduced. DRAWINGS

[0023] Figure 1 It is the overall structure schematic diagram of the utility model;

[0024] Figure 2 It is the inner ring extension structure schematic diagram of the utility model;

[0025] Figure 3 It is the steel pipe layer and the second hot melt layer separation state schematic diagram of the utility model;

[0026] Figure 4 It is the outer plastic layer cross section structure schematic diagram of the utility model;

[0027] Figure 5 It is the wear-resistant layer cross section structure schematic diagram of the utility model;

[0028] Figure 6 It is the overall cross section structure schematic diagram of the utility model.

[0029] The meaning of each mark in the drawing is as follows:

[0030] 1, inner plastic layer;

[0031] 2, first hot melt layer;

[0032] 3, steel pipe layer; 30, protrusion;

[0033] 4, second hot melt layer; 40, groove;

[0034] 5, outer plastic layer; 50, reinforcing wire;

[0035] 6, wear-resistant layer; 60, interlayer; 61, woven mesh ring. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] Please refer to Figures 1-6 The embodiment provides a technical scheme:

[0038] The steel-plastic composite pressure pipe comprises an inner plastic layer 1 and a first hot melt layer 2 sleeved on the outer wall of the inner plastic layer 1. The inner plastic layer 1 is made of polypropylene material. The outer diameter of the inner plastic layer 1 is matched with the inner diameter of the first hot melt layer 2, and the outer wall of the inner plastic layer 1 is adhesively fixed with the inner wall of the first hot melt layer 2.

[0039] In the present application, the cooperation of the inner plastic layer 1 reduces the erosion and damage of the solution passing through the inner plastic layer 1 to the inner wall of the first hot melt layer 2. The cooperation of the first hot melt layer 2 helps to combine and connect adjacent pipelines by hot melting. The hot melt connection of the first hot melt layer 2 to the inside increases the tightness of the adhesive combination.

[0040] Further, the first hot melt layer 2 is sleeved with a steel pipe layer 3 on the outer wall. The first hot melt layer 2 is made of polyamide mixed resin. The outer diameter of the first hot melt layer 2 is matched with the inner diameter of the steel pipe layer 3, and the outer wall of the first hot melt layer 2 is adhesively fixed with the inner wall of the steel pipe layer 3.

[0041] In the present application, the polyamide mixed resin facilitates the heating, melting and adhesive connection of the pipeline, increases the plasticity, and the adhesive connection of the first hot melt layer 2 and the steel pipe layer 3 increases the stability of the installation of the steel pipe layer 3.

[0042] Specifically, a plurality of protrusions 30 are arranged on the outer wall of the steel pipe layer 3. The protrusions 30 are annularly and equally spaced, and the protrusions 30 and the steel pipe layer 3 are integrally formed. The steel pipe layer 3 is made of carbon structural steel, and the outer diameter of the steel pipe layer 3 is matched with the inner diameter of the second hot melt layer 4.

[0043] In the present application, the cooperation of the plurality of protrusions 30 increases the structural toughness of the steel pipe layer 3, which helps to increase the overall extrusion resistance. The steel pipe layer 3 is made of carbon structural steel, which increases the overall strength and saves the manufacturing cost.

[0044] It should be noted that the second hot melt layer 4 is sleeved on the outer wall of the steel pipe layer 3, the recess 40 is arranged on the inner wall of the second hot melt layer 4 and corresponds to the protrusion 30, the second hot melt layer 4 is made of polyamide mixed resin, the recess 40 is arranged on the inner wall of the second hot melt layer 4 and corresponds to the protrusion 30, the width of the inner wall of the recess 40 is matched with the width of the outer wall of the protrusion 30, and the protrusion 30 is inserted and matched with the recess 40.

[0045] In the utility model, the protrusion 30 is inserted and matched with the recess 40, and the stability of the combination of the steel pipe layer 3 and the second hot melt layer 4 is increased.

[0046] Further, the outer plastic layer 5 is arranged on the outer wall of the second hot melt layer 4, and the reinforcing wire 50 is arranged in the pipe wall of the outer plastic layer 5.

[0047] Specifically, the outer diameter of the second hot melt layer 4 is matched with the inner diameter of the outer plastic layer 5, the outer plastic layer 5 is adhesively fixed with the second hot melt layer 4, the reinforcing wire 50 is in a spiral shape, and the reinforcing wire 50 is made of carbon structural steel.

[0048] In the utility model, the second hot melt layer 4 is further protected under the cooperation of the outer plastic layer 5, and the toughness of the outer plastic layer 5 is increased under the cooperation of the reinforcing wire 50, the bending damage influence is reduced, and the internal protection cooperation is lost.

[0049] It should be noted that the outer diameter of the outer plastic layer 5 is matched with the inner diameter of the wear-resistant layer 6, the hollow area between the inner wall and the outer wall of the wear-resistant layer 6 is the interlayer 60, the woven mesh ring 61 is arranged in the interlayer 60, and the thickness of the woven mesh ring 61 is matched with the width of the inner wall of the interlayer 60.

[0050] In the utility model, the internal protection is carried out on the wear-resistant layer 6, the overall structural stability is increased under the action of the woven mesh ring 61, the outer side contact friction loss is reduced for long-term exposure to the external environment, and the internal protection is lost.

[0051] In use, the steel pipe layer 3 is first combined and fixed with the inner plastic layer 1 through the first hot melt layer 2, is inserted and matched with the recess 40 on the second hot melt layer 4 under the cooperation of the plurality of protrusions 30, the stability of the combination is increased, the internal bending resistance is increased under the wrapping cooperation of the outer plastic layer 5 with the reinforcing wire 50, the overall extrusion resistance is increased under the cooperation of the steel pipe layer 3, and finally the wear-resistant layer 6 with the woven mesh ring 61 is fixed on the outer wall of the outer plastic layer 5.

[0052] When the two ends need to be connected with external pipelines, the first hot melt layer 2 and the second hot melt layer 4 are hot-melted and matched through a hot-melt gun, and are adhesively matched with corresponding connecting pipelines, the installation tightness is increased, the outer layer contact friction loss with external objects is reduced under the cooperation of the wear-resistant layer 6 with the woven mesh ring 61, the overall combination is simple, the wear resistance is increased, the anti-deformation strength is high, and the overall service life is prolonged.

Claims

1. A steel-plastic composite pressure pipe, comprising an inner plastic layer (1) and a first hot melt layer (2) sleeved on the outer wall of the inner plastic layer (1), characterized in that: The outer wall of the first hot melt layer (2) is sleeved with a steel pipe layer (3), the outer wall of the steel pipe layer (3) is provided with a plurality of protrusions (30), the outer wall of the steel pipe layer (3) is sleeved with a second hot melt layer (4), the inner wall of the second hot melt layer (4) is provided with a groove (40) corresponding to the protrusion (30), the outer wall of the second hot melt layer (4) is provided with an outer plastic layer (5), and the pipe wall of the outer plastic layer (5) is provided with a reinforcing wire (50).

2. The steel-plastic composite pressure pipe according to claim 1, characterized by: The inner plastic layer (1) is made of polypropylene material, the outer diameter of the inner plastic layer (1) is matched with the inner diameter of the first hot melt layer (2), and the outer wall of the inner plastic layer (1) is adhesively fixed with the inner wall of the first hot melt layer (2).

3. The steel-plastic composite pressure pipe according to claim 1, characterized by: The first hot melt layer (2) is made of polyamide mixed resin, the outer diameter of the first hot melt layer (2) is matched with the inner diameter of the steel pipe layer (3), and the outer wall of the first hot melt layer (2) is adhesively fixed with the inner wall of the steel pipe layer (3).

4. The steel-plastic composite pressure pipe according to claim 1, characterized by: The protrusions (30) are annularly and equidistantly distributed, and the protrusions (30) and the steel pipe layer (3) are integrally formed, the steel pipe layer (3) is made of carbon structural steel, and the outer diameter of the steel pipe layer (3) is matched with the inner diameter of the second hot melt layer (4).

5. The steel-plastic composite pressure pipe according to claim 1, characterized by: The second hot melt layer (4) is made of polyamide mixed resin, the inner wall of the second hot melt layer (4) is provided with a groove (40) corresponding to the protrusion (30), the inner wall of the groove (40) is matched with the outer wall of the protrusion (30) in width, and the protrusion (30) is inserted into the groove (40).

6. The steel-plastic composite pressure pipe according to claim 1, characterized by: The outer diameter of the second hot melt layer (4) is matched with the inner diameter of the outer plastic layer (5), the outer plastic layer (5) is adhesively fixed with the second hot melt layer (4), the reinforcing wire (50) is in a spiral shape, and the reinforcing wire (50) is made of carbon structural steel.

7. The steel-plastic composite pressure pipe according to claim 1, characterized by: The outer diameter of the outer plastic layer (5) is matched with the inner diameter of the wear-resistant layer (6), the hollow area between the inner wall and the outer wall of the wear-resistant layer (6) is a sandwich layer (60), the sandwich layer (60) is provided with a woven mesh ring (61), and the thickness of the woven mesh ring (61) is matched with the width of the inner wall of the sandwich layer (60).

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