A spray-wound thermal insulation pipe

Abstract

The present invention discloses a spray-wrapped thermal insulation pipe, which relates to the technical field of thermal insulation pipes and comprises a pipe body, a first thermal insulation layer, a second thermal insulation layer, an outer sheath pipe and an auxiliary structure which are arranged from the inside to the outside. A mesh-shaped first embedding groove is provided inside the first thermal insulation layer, and an adhesive portion is embedded in the first embedding groove, which is attached to the outer side of the pipe body. A mesh-shaped second embedding groove is provided on the outer side of the first thermal insulation layer, and the second thermal insulation layer is connected and fixed to the first thermal insulation layer by embedding the inner side into the second embedding groove. Anti-slip grooves are provided on the inner side of the outer sheath pipe, and a connecting pipe for connecting two adjacent thermal insulation pipes is provided at the end of the outer sheath pipe. An auxiliary structure for improving the airtightness of the connecting pipe is arranged between the connecting pipe and the pipe body. The present invention arranges a mesh-shaped adhesive portion in the first thermal insulation layer, and utilizes the adhesiveness of the adhesive portion to adhere the first thermal insulation layer to the outer side of the pipe body, so as not to affect the thermal insulation performance of the thermal insulation pipe, and avoids the situation where the first thermal insulation layer is directly sheathed on the outer side of the pipe body and peeling occurs due to the relatively smooth outer side of the pipe body.

Description

Technical Field

[0001] The invention relates to the technical field of thermal insulation pipes, in particular to a spray-wound thermal insulation pipe. Background Art

[0002] The spray-wound heating insulation pipe is composed of a working steel pipe, a spray-coated polyurethane insulation layer and an extruded polyethylene outer sheath. The thickness of the insulation layer and the protective layer can be adjusted arbitrarily within a certain range according to the needs during production. The thickness of the insulation layer required by the parameters of the heating and cooling media in centralized heating and cooling and the actual heat dissipation loss can be quantitatively produced to meet the needs of different projects.

[0003] Existing insulation pipes generally include an inner hot-dip galvanized pipe, an outer protective pipe, and an insulation layer between the hot-dip galvanized pipe and the outer protective pipe. The insulation layer is generally polyurethane. The bonding strength between the insulation layer and the pipe shell or the outer protective pipe is not enough, and peeling is prone to occur, which will lead to a decrease in the insulation effect. Heat is easily lost through the peeling area, especially the outer part of the hot-dip galvanized pipe. Since the outer side of the hot-dip galvanized pipe is relatively smooth, the insulation layer is more prone to peeling. For this reason, we propose a spray-wrapped insulation pipe. Summary of the invention

[0004] The object of the present invention is to provide a spray-wound thermal insulation pipe to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a spray-wrapped insulated pipe, comprising a pipe body, a first insulation layer, a second insulation layer, an outer sheath pipe and an auxiliary structure which are arranged in sequence from the inside to the outside, a mesh-shaped first embedding groove is provided inside the first insulation layer, an adhesive portion is embedded in the first embedding groove, the adhesive portion is attached to the outside of the pipe body, a mesh-shaped second embedding groove is provided on the outside of the first insulation layer, the second insulation layer is connected and fixed to the first insulation layer by embedding the inner side into the second embedding groove, an anti-slip groove is provided on the inner side of the outer sheath pipe, a connecting pipe connecting two adjacent insulation pipes is provided at the end of the outer sheath pipe, and an auxiliary structure for improving the airtightness of the connecting pipe is arranged between the connecting pipe and the pipe body, the present invention arranges a mesh-shaped adhesive portion in the first insulation layer, utilizes the viscosity of the adhesive portion to adhere the first insulation layer to the outside of the pipe body, and at the same time does not affect the insulation performance of the insulation pipe, thereby avoiding the first insulation layer being directly covered on the outside of the pipe body and peeling off due to the relatively smooth outer side of the pipe body.

[0006] Preferably, the first thermal insulation layer is a tubular polyurethane layer, which is in direct contact with the pipe body and forms a thermal insulation layer on the outside of the pipe body.

[0007] Preferably, the second thermal insulation layer is a foamed polyurethane layer, which has better thermal insulation performance and is arranged on the outside of the first thermal insulation layer to improve the thermal insulation effect of the first thermal insulation layer.

[0008] Preferably, evenly distributed diamond holes are provided inside the second insulation layer. The arrangement of the diamond holes can make the second insulation layer present a mesh structure. When the second insulation layer is insulated, the air insulation coefficient between the diamond holes is higher, which is beneficial to reduce the heat loss of the medium liquid in the insulation pipe.

[0009] Preferably, a fixed end is fixedly provided on the outside of the tube body, and three sets of stepped surfaces are provided on the outside of the fixed end to match the inner sides of both ends of the connecting tube. The three sets of stepped surfaces can improve the sealing performance when connecting the connecting tube and the fixed end.

[0010] Preferably, a first tapered surface is provided at the connection between two adjacent step surfaces to further improve the sealing performance of the connection.

[0011] Preferably, the auxiliary structure includes a first anti-corrosion block, which is arranged in the first conical surface, and the first anti-corrosion block cooperates with the first limiting groove arranged on the outer side of the fixed end head and the inner side of the connecting tube; a second anti-corrosion block is arranged on the outer side of the connection between the connecting tube and the fixed end head, and the second anti-corrosion block cooperates with the second limiting groove arranged at the connection between the connecting tube and the fixed end head; an opening is arranged at an end of the first anti-corrosion block away from the connecting tube, and a soft sleeve filled with a coagulant is fixedly arranged in the opening; a fixed shaft is fixedly arranged in the first limiting groove arranged on the outer side of the fixed end head, and a fixed ball engaged with the opening is fixedly arranged on the outer side of the fixed shaft; a fixed cone is fixedly arranged on the side of the fixed ball away from the fixed shaft, and the fixed cone is coaxial with the central opening of the soft sleeve; a liquid flow groove connected to the opening is symmetrically arranged in the first anti-corrosion block, and an elastic membrane is fixedly arranged on the outer side of the liquid flow groove; a molding groove is symmetrically arranged in the first limiting groove arranged on the outer side of the fixed end head, and symmetrically distributed blades are fixedly arranged on the outer side of the fixed cone, so as to improve the connection strength between the connecting tube and the fixed end head, and at the same time increase the connection sealing performance of the two, and at the same time, it can also prevent liquid from entering the contact surface between the connecting tube and the fixed end head and affecting the sealing performance in the tube bodies of the two.

[0012] Preferably, a third anti-corrosion block is embedded in the connecting pipe, the inner side of the third anti-corrosion block overlaps with the inner side of the pipe body, conical rings are provided at both ends of the pipe body, and second conical surfaces are provided on the outer sides of both ends of the third anti-corrosion block. The conical rings are embedded with the second conical surfaces to prevent the medium in the pipe body from entering from the inside and corroding the contact surface between the connecting pipe and the fixed end head.

[0013] Preferably, a cavity is provided in the connecting pipe, and the high thermal insulation property of air is utilized to ensure the thermal insulation performance of the connecting pipe.

[0014] Preferably, a threaded line is fixedly provided on the outside of the outer sheath pipe to increase the friction performance between the outside of the insulation pipe and the soil and the ground, which can effectively prevent the insulation pipe from sliding.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention provides a mesh-shaped adhesive portion in the first thermal insulation layer, and uses the adhesiveness of the adhesive portion to adhere the first thermal insulation layer to the outside of the pipe body, while not affecting the thermal insulation performance of the thermal insulation pipe, thereby preventing the first thermal insulation layer from being directly sheathed on the outside of the pipe body, which may cause peeling due to the relatively smooth outside of the pipe body;

[0017] 2. Through the coordinated use of the first insulation layer and the second insulation layer, the double insulation layers cooperate with each other to form multi-layer insulation, effectively reducing heat transfer and heat energy loss, while preventing external cold from entering the pipe body, forming an insulation layer between the pipe body and the external environment, and ensuring the insulation effect of the insulation pipe during long-distance transportation of the medium;

[0018] 3. By setting a fixed end at the end of the pipe body and then fixing the fixed end to the connecting pipe, the setting of three sets of step surfaces and the first conical surface can ensure the sealing performance between the fixed end and the connecting pipe. At the same time, the second anti-corrosion block can prevent external liquid from entering the connection and corroding the contact surface. The third anti-corrosion block can prevent the medium in the pipe from entering the connection from the inside and corroding the contact surface. The setting of the first anti-corrosion block can prevent the liquid from directly passing through the connection when the second anti-corrosion block or the third anti-corrosion block is damaged, thereby increasing the service life of the seal through multiple insurances. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the connection between the pipe body and the connecting pipe of the present invention;

[0021] Figure 3 It is a schematic cross-sectional view of the overall structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the second thermal insulation layer of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the first thermal insulation layer of the present invention;

[0024] Figure 6 This is an exploded schematic diagram of the internal structure of the first thermal insulation layer of the present invention;

[0025] Figure 7 This is a schematic diagram of the structure of the outer sheath tube of the present invention;

[0026] Figure 8 This is a schematic diagram of the spatial distribution of the auxiliary structure of the present invention;

[0027] Fig. 9 for Figure 3 Enlarged view of point A in the middle;

[0028] Fig.10 This is a schematic diagram of the connection between the first anti-corrosion block of the present invention, the connecting pipe and the fixed end.

[0029] In the figure: 1-tube body; 2-first insulation layer; 3-second insulation layer; 4-outer sheath tube; 5-first embedding groove; 6-adhesive part; 7-second embedding groove; 8-anti-slip pattern; 9-connecting tube; 10-diamond hole; 11-fixed end; 12-step surface; 13-first conical surface; 14-first anti-corrosion block; 15-second anti-corrosion block; 16-third anti-corrosion block; 17-conical ring; 18-second conical surface; 19-cavity; 20-thread line; 21-opening; 22-soft sleeve; 23-fixed shaft; 24-fixed ball; 25-fixed cone; 26-liquid groove; 27-auxiliary structure; 28-elastic membrane; 29-molding groove; 30-blade. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example:

[0032] See also Figure 1-Figure 10 The figure shows a spray-wound insulation pipe, comprising a pipe body 1, a first insulation layer 2, a second insulation layer 3, an outer sheath pipe 4 and an auxiliary structure 27 arranged in sequence from the inside to the outside. A mesh first embedding groove 5 is provided inside the first insulation layer 2, and an adhesive portion 6 is embedded in the first embedding groove 5. The adhesive portion 6 is attached to the outer side of the pipe body 1. A mesh second embedding groove 7 is provided on the outer side of the first insulation layer 2. The second insulation layer 3 is connected and fixed to the first insulation layer 2 by embedding the inner side into the second embedding groove 7. An anti-slip pattern 8 is provided on the inner side of the outer sheath pipe 4. A connecting pipe 9 for connecting two adjacent insulation pipes is provided at the end of the outer sheath pipe 4. An auxiliary structure 27 for improving the airtightness at the connecting pipe 9 is provided between the connecting pipe 9 and the pipe body 1.

[0033] Some implementation methods of the present application are described in detail below with reference to the accompanying drawings:

[0034] See also Figure 1-Figure 10 In this embodiment: a mesh adhesive portion 6 is provided in the first insulation layer 2, and the first insulation layer 2 is adhered to the outside of the pipe body 1 by utilizing the viscosity of the adhesive portion 6, while the insulation performance of the insulation pipe is not affected, thereby preventing the first insulation layer 2 from being directly sheathed on the outside of the pipe body 1 and peeling off due to the relatively smooth outside of the pipe body 1.

[0035] Among them, the first thermal insulation layer 2 is a tubular polyurethane layer, which forms an internal thermal insulation layer on the outside of the pipe body 1 and is in direct contact with the pipe body 1. The first embedding groove 5 opened on the inner side thereof is engaged with the bonding part 6. The bonding part 6 is made of a plurality of strip-shaped bonding strips which are wide in the middle and narrow on both sides and are spirally assembled. The inner side thereof coincides with the inner side of the first thermal insulation layer 2, and the two are attached to the outside of the pipe body 1 together. The mesh bonding part 6 can prevent the first thermal insulation layer 2 from rotating or sliding on the outside of the pipe body 1, reduce the mutual movement between the first thermal insulation layer 2 and the pipe body 1, and thus avoid the occurrence of peeling. The first thermal insulation layer 2 forms a heat insulation layer on the outside of the pipe body 1. At the same time, the second thermal insulation layer 3 is a foamed polyurethane layer with good thermal insulation performance. It is arranged on the outside of the first thermal insulation layer 2 to improve the thermal insulation effect of the first thermal insulation layer 2. The double-layer thermal insulation layers cooperate with each other to form multi-layer thermal insulation, which effectively reduces heat transfer and heat energy loss, and improves the temperature range of the medium transported by the insulation pipe while ensuring the temperature of the medium inside the pipe body 1 during long-distance transportation.

[0036] When setting the second thermal insulation layer 3 foamed polyurethane layer, the pipe body 1 moves at a uniform speed on a rotating tugwheel with a certain angle, and the spray gun sprays the polyurethane raw material on the spirally advancing pipe body 1, and then adjusts the force direction of the rotating tugwheel to drive the pipe body 1 to rotate in the opposite direction, and uses the spray gun to retract to spray the polyurethane raw material on the spirally advancing pipe body 1. Through two sprayings, a mesh polyurethane layer is formed on the outside of the first thermal insulation layer 2. The polyurethane raw material is initiated within a certain period of time, and the part in contact with the first thermal insulation layer 2 is embedded in the second embedding groove 7 during initiation, and is tightly connected to the first thermal insulation layer 2, thereby ensuring the connection strength between the second thermal insulation layer 3 and the first thermal insulation layer 2.

[0037] It is worth noting that Figure 4 As shown, diamond holes 10 are formed in the mesh polyurethane layer, and the air between the diamond holes 10 has a higher thermal insulation coefficient, which is beneficial to reducing the heat loss of the medium liquid in the insulation pipe. At the same time, the diamond holes 10 can ensure the supporting strength of the second insulation layer 3 to the outer sheath pipe 4 and the first insulation layer 2.

[0038] In the implementation of this technical solution, if Figure 2 , Figure 3 and Fig. 9 As shown, a fixed end 11 is fixedly provided on the outside of the tube body 1, and three groups of step surfaces 12 are provided on the outside of the fixed end 11 to cooperate with the inner sides of the two ends of the connecting pipe 9, and a first conical surface 13 is provided at the connection between two adjacent step surfaces 12. The arrangement of the three groups of step surfaces 12 and the first conical surface 13 can improve the sealing performance of the connection between the fixed end 11 and the connecting pipe 9 and avoid heat loss.

[0039] At the same time, the auxiliary structure 27 includes a first anti-corrosion block 14, which is arranged in the first conical surface 13, and the first anti-corrosion block 14 cooperates with the first limiting groove arranged on the outer side of the fixed end head 11 and the inner side of the connecting pipe 9. The first anti-corrosion block 14 is arranged parallel to the axis of the tube body 1 to facilitate the cooperation between the fixed end head 11 and the connecting pipe 9. The first limiting groove is symmetrically arranged on the outer side of the fixed end head 11 and the inner side of the connecting pipe 9. The first anti-corrosion block 14 is embedded in the first limiting groove to block the first conical surface 13, extend the flow path of the liquid entering the connection between the fixed end head 11 and the connecting pipe 9, and thus improve the overall sealing performance. A second anti-corrosion block 15 is arranged on the outer side of the connection between the connecting pipe 9 and the fixed end head 11, and the second anti-corrosion block 15 cooperates with the second limiting groove arranged at the connection between the connecting pipe 9 and the fixed end head 11. The second anti-corrosion block 15 is fixed on both sides A wing plate is provided, which is inserted into the second limiting grooves on both sides. While improving the installation strength of the second anti-corrosion block 15, the sealing performance of the outer side of the connection between the fixed end head 11 and the connecting pipe 9 can be improved. A third anti-corrosion block 16 is embedded in the connecting pipe 9. The inner side of the third anti-corrosion block 16 coincides with the inner side of the tube body 1. Conical rings 17 are provided at both ends of the tube body 1. Second conical surfaces 18 are provided on the outer sides of both ends of the third anti-corrosion block 16. The conical rings 17 are embedded with the second conical surfaces 18. The second anti-corrosion block 15 can prevent external liquid from entering the connection and corroding the contact surface. The third anti-corrosion block 16 can prevent the medium in the pipe from entering the connection from the inside and corroding the contact surface. The setting of the first anti-corrosion block 14 can prevent liquid from directly passing through the connection when the second anti-corrosion block 15 or the third anti-corrosion block 16 is damaged, thereby increasing the service life of the seal through multiple insurances.

[0040] When connecting the connecting tube 9 to the tube body 1, first polish and grind the outer side of the tube body 1, the outer side of the fixed end 11 and the inner side of the connecting tube 9 to ensure the sealing performance, and then assemble the tube body 1, the fixed end 11 and the connecting tube 9 according to the principle of thermal expansion and contraction. Heat the connecting tube 9, and the connecting tube 9 expands and the inner circle expands. Insert the fixed end 11 at the end of the tube body 1 into the connecting tube 9, and embed the first anti-corrosion block 14 into the first limit grooves of the two. After the connecting tube 9 returns to room temperature, the fixed end 11 is tightly joined with the connecting tube 9, thereby achieving the connection seal at the joint of the tube body 1.

[0041] In addition, if Figure 3 As shown, a cavity 19 is provided in the connecting pipe 9 , and the high thermal insulation of air is utilized to ensure the thermal insulation performance of the connecting pipe 9 and reduce the heat loss when the medium flows through the connecting pipe 9 .

[0042] At the same time, if Figure 1As shown, a thread line 20 is fixedly provided on the outside of the outer sheath tube 4 to increase the friction performance between the outside of the insulation tube and the soil and the ground, which can effectively prevent the insulation tube from sliding. When making the thread line 20, the shape and angle of the mold mouth are adjusted, and a friction surface is made at the outlet to generate friction when the product passes through the outlet, thus forming a friction surface, and then the surface of the product is compacted by high-temperature spraying to form the outer sheath tube 4 of the insulation tube with threads and concave-convex surfaces.

[0043] In some embodiments of the present technical solution, Fig.10 As shown, in order to improve the connection strength between the first anti-corrosion block 14 and the connecting pipe 9 and the fixed end head 11, an opening 21 is provided at one end of the first anti-corrosion block 14 away from the connecting pipe 9, a soft sleeve 22 filled with a coagulant is fixedly provided in the opening 21, a fixed shaft 23 is fixedly provided in the first limiting groove provided on the outer side of the fixed end head 11, a fixed ball 24 engaged with the opening 21 is fixedly provided on the outer side of the fixed shaft 23, a fixed cone 25 is fixedly provided on the side of the fixed ball 24 away from the fixed shaft 23, the fixed cone 25 is coaxial with the central opening of the soft sleeve 22, a liquid groove 26 connected to the opening 21 is symmetrically provided in the first anti-corrosion block 14, an elastic membrane 28 is fixedly provided on the outer side of the liquid groove 26, a molding groove 29 is symmetrically provided in the first limiting groove provided on the outer side of the fixed end head 11, and symmetrically distributed blades 30 are fixedly provided on the outer side of the fixed cone 25;

[0044] In this embodiment, when the fixed end 11 slowly moves toward the connecting tube 9, the first anti-corrosion block 14 fixed on the connecting tube 9 gradually inserts into the first limiting groove arranged outside the fixed end 11. In this process, the fixed thorn slowly inserts into the central opening of the soft sleeve 22. As the fixed thorn goes deeper, the blade 30 fixedly arranged outside the fixed cone 25 cuts the soft sleeve 22, and the coagulant in the soft sleeve 22 flows out and enters the liquid groove 26 under the pressure of the fixed ball 24 until it fills the inner side of the elastic membrane 28. The elastic membrane 28 squeezes into the forming groove 29, and the coagulant gradually solidifies when it contacts the air. After the coagulant solidifies, the formed coagulant limits the first anti-corrosion block 14 at the forming groove 29. This improves the connection strength between the first anti-corrosion block 14 fixed on the connecting tube 9 and the fixed end 11, thereby improving the sealing performance of the connection between the connecting tube 9 and the pipe body 1.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spray-wound thermal insulation pipe, characterized in that: include: A pipe body (1), a first thermal insulation layer (2), a second thermal insulation layer (3) and an outer sheath pipe (4) are sequentially arranged from the inside to the outside, the first thermal insulation layer (2) is provided with a mesh-shaped first embedding groove (5), an adhesive portion (6) is embedded in the first embedding groove (5), and the adhesive portion (6) is attached to the outside of the pipe body (1), the first thermal insulation layer (2) is provided with a mesh-shaped second embedding groove (7), the second thermal insulation layer (3) is connected and fixed to the first thermal insulation layer (2) by embedding the inside of the second embedding groove (7), the inner side of the outer sheath pipe (4) is provided with anti-slip grooves (8), and the end of the outer sheath pipe (4) is provided with a connecting pipe (9) for connecting two adjacent thermal insulation pipes; An auxiliary structure (27), for improving the airtightness of the connecting pipe (9), the auxiliary structure (27) being arranged between the connecting pipe (9) and the pipe body (1), the auxiliary structure (27) comprising a first anti-corrosion block (14), the first anti-corrosion block (14) being arranged between the connecting pipe (9) and the pipe body (1), an opening (21) being arranged on the side of the first anti-corrosion block (14), a soft sleeve (22) containing a coagulant being fixedly arranged in the opening (21), a fixed ball (24) being fitted with the opening (21) being arranged at the end of the pipe body (1), a fixed cone (25) being arranged on the outside of the fixed ball (24), a liquid flow groove (26) being symmetrically arranged in the first anti-corrosion block (14) and being connected with the opening (21); a fixed end (11) being fixedly arranged on the outside of the pipe body (1); The first anti-corrosion block (14) cooperates with a first limiting groove provided on the outer side of the fixed end head (11) and the inner side of the connecting pipe (9); a fixed shaft (23) is fixedly provided in the first limiting groove provided on the outer side of the fixed end head (11); the fixed ball (24) is fixedly provided on the outer side of the fixed shaft (23); the fixed cone (25) is fixedly provided on a side of the fixed ball (24) away from the fixed shaft (23); the fixed cone (25) is coaxial with a central opening of the soft sleeve (22); and symmetrically distributed blades (30) are fixedly provided on the outer side of the fixed cone (25).

2. The spray-wrapped thermal insulation pipe according to claim 1, characterized in that: The first thermal insulation layer (2) is a tubular polyurethane layer.

3. The spray-wrapped thermal insulation pipe according to claim 2, characterized in that: The second thermal insulation layer (3) is a foamed polyurethane layer.

4. The spray-wrapped thermal insulation pipe according to claim 3, characterized in that: The second thermal insulation layer (3) is provided with evenly distributed diamond-shaped holes (10) inside.

5. The spray-wrapped thermal insulation pipe according to claim 1, characterized in that: The fixed end head (11) is provided with three sets of stepped surfaces (12) on the outside thereof, which cooperate with the inner sides of the two ends of the connecting pipe (9).

6. The spray-wrapped thermal insulation pipe according to claim 5, characterized in that: A first tapered surface (13) is provided at the connection between two adjacent step surfaces (12).

7. The spray-wrapped thermal insulation pipe according to claim 6, characterized in that: The auxiliary structure (27) also includes a second anti-corrosion block (15), wherein the first anti-corrosion block (14) is arranged in the first conical surface (13), and the second anti-corrosion block (15) is arranged on the outer side of the connection between the connecting pipe (9) and the fixed end head (11), and the second anti-corrosion block (15) cooperates with a second limiting groove arranged at the connection between the connecting pipe (9) and the fixed end head (11), and the opening (21) is arranged at one end of the first anti-corrosion block (14) away from the connecting pipe (9), an elastic membrane (28) is fixedly arranged on the outer side of the liquid flow groove (26), and a forming groove (29) is symmetrically arranged in the first limiting groove arranged on the outer side of the fixed end head (11).

8. The spray-wrapped thermal insulation pipe according to claim 7, characterized in that: A third anti-corrosion block (16) is embedded in the connecting pipe (9), the inner side of the third anti-corrosion block (16) overlaps with the inner side of the pipe body (1), conical rings (17) are provided at both ends of the pipe body (1), second conical surfaces (18) are provided on the outer sides of both ends of the third anti-corrosion block (16), and the conical rings (17) are embedded with the second conical surfaces (18).

9. The spray-wrapped thermal insulation pipe according to claim 1, characterized in that: A cavity (19) is provided in the connecting pipe (9).

10. The spray-wrapped thermal insulation pipe according to claim 1, characterized in that: The outer side of the outer sheath tube (4) is fixedly provided with a thread line (20).

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