A pressure-resistant polyurethane insulation pipe

Abstract

This application provides a pressure-resistant polyurethane insulation pipe, including an outer pipe, an inner pipe inside the outer pipe, an insulation space located between the inner pipe and the outer pipe, an insulation joint located at the connection between the inner pipe and the outer pipe and wrapping it, and a fixing ring disposed outside the insulation joint for locking connection. This invention can extend the service life of the insulation pipe, especially in areas with special terrain conditions, particularly areas with large temperature differences. When the insulation pipe expands due to heat, causing the insulation joint to move, the support ring and shrink sleeve will expand accordingly, thus preventing cracking at the weld of the insulation joint due to thermal expansion.

Description

Technical Field

[0001] This utility model belongs to the field of thermal insulation pipe technology, and specifically relates to a pressure-resistant polyurethane thermal insulation pipe. Background Technology

[0002] Direct-buried radiant heating has become the main radiant heating method used in large-scale heating networks in China. Most heating pipelines also use direct-buried prefabricated pressure-resistant polyurethane insulated pipes. These pressure-resistant polyurethane insulated pipes consist of an outer pipe, an inner pipe, and an insulation joint, with the insulation joint located on the outside of the connection point between the outer and inner pipes.

[0003] In areas with unique terrain and environments, especially those with significant temperature differences, the insulation pipe expands when heated during operation, causing the insulation joint to move as well. When the thermal displacement of the pressure-resistant polyurethane insulation pipe is substantial, cracks may occur at the weld of the insulation joint. This allows external moisture and water to enter the outer pipe through the insulation joint, corroding the inner insulation layer.

[0004] Therefore, how to solve the defects in the above-mentioned technical solutions has become one of the urgent problems to be solved in the field of thermal insulation pipe technology. Utility Model Content

[0005] In view of the problems existing in the background art, the present invention provides a pressure-resistant polyurethane insulation pipe, comprising:

[0006] outer tube;

[0007] The inner tube inside the outer tube;

[0008] The insulation space located between the inner tube and the outer tube,

[0009] An insulated joint located at the connection between the inner tube and the outer tube, and which is wrapped around it;

[0010] A retaining ring is installed outside the insulation joint to lock it in place.

[0011] Optionally, the fixing ring consists of two sets of opposing reinforcing rings that enclose a circle.

[0012] One set of reinforcing rings has two sets of oppositely arranged connecting seats on its end face.

[0013] The two sets of connecting seats are connected by a locking plate via a hinge connector.

[0014] Locking rings are integrally formed with the locking plate on both sides of its end face.

[0015] The locking ring engages with a locking hook located on another set of opposite reinforcing rings to form a locking connection.

[0016] Optionally, the thermal insulation joint includes a fixed end.

[0017] The fixed end passes through the outer tube and extends into the interior of the outer tube.

[0018] The fixed end side face located inside the thermal insulation joint is provided with a support ring integrally formed therewith.

[0019] Optionally, the support ring includes a lateral end, and the lateral end is fitted against the outer wall of the outer tube.

[0020] The support ring also includes an arc-shaped end and a first inclined end connected to the arc-shaped end.

[0021] Optionally, the first inclined end extends continuously until it enters the cavity of the support and fixing end and abuts against the lateral end of the shrink sleeve.

[0022] Optionally, the shrink sleeve is wavy, and the support ring is made entirely of a heat-shrinkable material composed of a radiation-crosslinked polyolefin substrate and a sealing hot melt adhesive.

[0023] Optionally, a pressure strip is provided above the lateral end of the shrink sleeve located outside the supporting and fixing end cavity.

[0024] The pressure strip and the support fixing end are fixedly connected by adhesive;

[0025] The supporting and fixing end, which is away from the outer tube, is located on the inner wall of the insulation joint.

[0026] Optionally, the support fixing end is located at the junction of the first inclined end and the second inclined end, and is fixedly connected.

[0027] In summary, the beneficial effects of this utility model are:

[0028] This invention can extend the service life of insulation pipes, especially in areas with unique terrain and large temperature differences. When the insulation pipe expands due to heat, it causes the insulation joint to move along with it. At this time, the support ring and shrink sleeve will also expand, thus preventing cracking at the weld of the insulation joint due to thermal expansion. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the pressure-resistant polyurethane insulation pipe of this utility model;

[0030] Figure 2 This utility model Figure 1 Enlarged view of the structure at position A in the middle;

[0031] Figure 3 This is a partial structural schematic diagram of a two-dimensional representation of an embodiment of the pressure-resistant polyurethane insulation pipe of this utility model;

[0032] Figure 4 This utility model Figure 3 Enlarged view of the structure at position B in the middle;

[0033] Figure 5 This utility model Figure 3 Enlarged view of the structure at position C.

[0034] Figure label:

[0035] 100. Insulation pipe;

[0036] 10. Inner tube;

[0037] 20. Outer tube;

[0038] 30. Insulated connector; 301. Fixed end;

[0039] 302, Support ring; 3021, Arc-shaped end; 3022, First inclined end;

[0040] 303. Support and fixing end; 304. Pressure strip; 306. Shrink sleeve; 40. Reinforcing ring;

[0041] 501. Locking hook; 502. Locking ring; 503. Connecting seat; 504. Hinge connector; 505. Locking plate. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. Although exemplary embodiments are disclosed in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to facilitate a more thorough understanding of the present utility model and to fully convey the concept of the present utility model to those skilled in the art.

[0043] In the description of this specification, the references to terms such as "certain embodiments," "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0044] In this utility model, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "join," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "join" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] like Figure 1-5 As shown, this embodiment provides a pressure-resistant polyurethane insulation pipe 100, including an outer pipe 20 and an inner pipe 10 disposed within the outer pipe 20, wherein the inner pipe 10 extends into the outer pipe 20.

[0046] An insulation space is provided between the inner tube 10 and the outer tube 20, and the insulation space is filled with an insulation lining. The insulation lining is made of heat-insulating material. During installation, a vacuum is drawn after welding at the connection between the inner tube 10 and the outer tube 20, and the lining is wrapped with an insulation joint 30 at the same time.

[0047] Furthermore, a fixing ring is provided on the outside of the thermal insulation joint 30. The fixing ring consists of two sets of oppositely arranged reinforcing rings that enclose and form a circular shape.

[0048] One set of reinforcing rings has two sets of oppositely arranged connecting seats 503 on its end face, and the two sets of connecting seats 503 are connected to a locking plate 505 by a hinge connector 504. The locking plate 505 has locking rings 502 integrated with it on both sides of its end face, and the locking rings 502 are fastened to locking hooks 501 on another set of reinforcing rings (with locking plates) that are opposite to it, for locking connection.

[0049] Furthermore, the thermal insulation joint 30 includes a fixed end 301. During installation, the fixed end is driven into the thermal insulation joint and the outer tube using mechanical tools. The fixed end 301 passes through the outer tube 20 and extends into the interior of the outer tube 20. The side end face of the fixed end 301 located inside the thermal insulation joint is provided with a support ring 302 integrally formed therewith.

[0050] The support ring 302 includes a lateral end, and the lateral end is in contact with the outer wall of the outer tube 20.

[0051] The support ring 302 also includes an arc-shaped end 3021 and a first inclined end 3022 connected to the arc-shaped end 3021.

[0052] Furthermore, the first inclined end 3022 extends continuously until it enters the cavity of the support and fixing end 303 and abuts against the lateral end of the shrink sleeve 306.

[0053] Furthermore, the shrink sleeve 306 is wavy, and the support ring 302 is made entirely of a heat-shrinkable material composed of a radiation cross-linked polyolefin substrate and a sealing hot melt adhesive.

[0054] Furthermore, a pressure strip 304 is provided above the lateral end of the shrink sleeve 306 located outside the cavity of the support and fixing end, and the pressure strip 304 is fixedly connected to the support and fixing end by adhesive; the support and fixing end 303, which is away from the outer tube 20, is fixedly connected to the inner wall of the heat insulation joint 30 by welding or other means.

[0055] It should be noted that during application, especially in areas with special terrain and large temperature differences, when the insulation pipe is in operation, it expands due to heat, causing the insulation joint to move together. At this time, the support ring and shrink sleeve will also expand, which can prevent cracking of the weld seam of the insulation joint due to thermal expansion.

[0056] Furthermore, a support and fixing end 303 is provided at the junction of the first inclined end 3022 and the second inclined end 3023, and the connection is made by adhesive bonding.

[0057] It should be noted that multiple tests have proven the bonding strength between the support ring and the fixed end of the support. This is sufficient to ensure that the support ring maintains a firm bond throughout its expansion and contraction.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not restrictive. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solution of this utility model do not depart from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A pressure-resistant polyurethane insulation pipe, characterized in that, include: outer tube; The inner tube inside the outer tube; The insulation space located between the inner tube and the outer tube, An insulated joint located at the connection between the inner tube and the outer tube, and which is wrapped around it; A retaining ring is installed outside the insulation joint to lock it in place.

2. The pressure-resistant polyurethane insulation pipe according to claim 1, characterized in that, The fixing ring consists of two sets of opposing reinforcing rings that enclose a circle. One set of reinforcing rings has two sets of oppositely arranged connecting seats on its end face. The two sets of connecting seats are connected by a locking plate via a hinge connector. Locking rings are integrally formed with the locking plate on both sides of its end face. The locking ring engages with a locking hook located on another set of opposite reinforcing rings to form a locking connection.

3. The pressure-resistant polyurethane insulation pipe according to claim 1, characterized in that, The thermal insulation joint includes a fixed end. The fixed end passes through the outer tube and extends into the interior of the outer tube. The fixed end side face located inside the thermal insulation joint is provided with a support ring integrally formed therewith.

4. The pressure-resistant polyurethane insulation pipe according to claim 3, characterized in that, The support ring includes a lateral end, and the lateral end is in contact with the outer wall of the outer tube. The support ring also includes an arc-shaped end and a first inclined end connected to the arc-shaped end, and a second inclined end is provided on one side of the first inclined end.

5. The pressure-resistant polyurethane insulation pipe according to claim 4, characterized in that, The first inclined end extends continuously until it enters the cavity of the support and fixing end and abuts against the lateral end of the shrink sleeve.

6. The pressure-resistant polyurethane insulation pipe according to claim 5, characterized in that, The shrink sleeve is designed in a wavy shape.

7. The pressure-resistant polyurethane insulation pipe according to claim 5, characterized in that, A pressure strip is provided above the lateral end of the shrink sleeve located outside the supporting and fixing end cavity. The pressure strip and the support fixing end are fixedly connected by adhesive; The supporting and fixing end, which is away from the outer tube, is located on the inner wall of the insulation joint.

8. The pressure-resistant polyurethane insulation pipe according to claim 5, characterized in that, The support and fixing end is located at the junction of the first inclined end and the second inclined end, and is fixedly connected.

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