Fracture lap joint structure for heat preservation of buried pipe
By forming step-like retraction and non-planar or conical sections on the section of the insulation material layer of the buried pipe, the problem of poor insulation effect at the welding position of the buried pipe is solved, and a more efficient insulation effect is achieved.
Patent Information
- Application Number
- CN202421599698.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-08
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-07-08
AI Technical Summary
In the prior art, the thermal insulation effect at the welding position of the buried pipe is poor, and heat is easily lost from the straight seams at the welding position.
A fracture overlap structure for underground pipe insulation is adopted, and a step-like retraction is formed at the cross section of the insulation material layer to form a non-planar or conical cross section, increasing the gap path and reducing heat loss.
It improves the insulation effect at the end interface of the buried pipe, reduces heat loss, and enhances the insulation performance at the welding position.
Smart Images
Figure CN222760549U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of underground pipes, in particular to a fracture overlap structure used for heat preservation of underground pipes. Background Art
[0002] In an underground direct buried pipeline system that transports high-temperature media, after two adjacent pipelines are welded, an insulation patch needs to be added at the welding position. In the prior art, the junction between the insulation patch and the pipeline insulation layer is a straight seam, and heat is easily lost from the straight seam, resulting in poor insulation effect at the pipeline welding position, which needs to be improved. Summary of the invention
[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides a fracture overlap structure for underground pipe insulation, aiming to improve the insulation effect at the interface at the end of the underground pipe.
[0004] Technical solution: To achieve the above-mentioned purpose, the utility model provides a fracture overlap structure for underground pipe insulation, comprising an underground pipe, with multiple layers of insulation material layers on the outside of the underground pipe, the multiple layers of insulation material layers forming a cross-section at the port of the buried pipe, and the cross-sections of the multiple layers of insulation material layers are combined into an overlapping fracture; at the overlapping fracture, each insulation material layer shrinks layer by layer from the inside to the outside, so that the overlapping fracture is stepped, and the cross-section of at least one insulation material layer is a non-planar cross-section.
[0005] Furthermore, at least one layer of the thermal insulation material has a conical cross section.
[0006] Furthermore, for the thermal insulation material layer with a tapered cross section, the small diameter end of the tapered cross section is located inwardly, and the large diameter end is located outwardly, so that an inwardly concave slot is formed between the thermal insulation material layer with a tapered cross section and its adjacent thermal insulation material layer.
[0007] Furthermore, all the insulation material layers outside the buried pipe have non-planar cross-sections.
[0008] Furthermore, all the thermal insulation material layers outside the buried pipe have a conical cross section, and from the inside to the outside, the taper of the conical cross section of each thermal insulation material layer decreases layer by layer.
[0009] Furthermore, the multiple layers of thermal insulation material outside the buried pipe are, from inside to outside, a first nanomaterial layer, a second nanomaterial layer, a third nanomaterial layer, a first long-haired fiber felt layer, a high-temperature glass wool layer and a second long-haired fiber felt layer, an outer sleeve is provided outside the second long-haired fiber felt layer, and an air layer is provided between the second long-haired fiber felt layer and the outer sleeve.
[0010] Furthermore, a reflective layer is arranged outside any thermal insulation material layer.
[0011] Beneficial effects: The utility model provides a fracture overlap structure for underground pipe insulation, in which each insulation material layer shrinks layer by layer from the inside to the outside at the overlap fracture, so that the overlap fracture is stepped, and at least one insulation material layer has a non-planar cross-section, so that a curved seam can be formed at the junction of the insulation patch and the overlap fracture, and heat is not easily dissipated from the curved seam, thereby improving the insulation effect at the interface at the end of the underground pipe. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Attached Figure 1 It is a structural schematic diagram of the overlapping fracture of two adjacent buried pipes. DETAILED DESCRIPTION
[0013] The utility model is further described below in conjunction with the accompanying drawings.
[0014] As attached Figure 1 The fracture overlap structure for underground pipe insulation comprises an underground pipe 1, and the underground pipe 1 has multiple layers of insulation material outside, and the multiple layers of insulation material form a cross section at the end of the underground pipe 1, and the cross sections of the multiple layers of insulation material are combined into an overlap fracture 2. Figure 1 As shown in , when two buried pipes 1 are welded together, thermal insulation patches are added at two overlapping fractures 2 to insulate the end welding portions of the buried pipes 1 .
[0015] The inner layer is closer to the buried pipe 1, and the outer layer is farther away from the buried pipe 1. At the overlapped fracture 2, each insulation material layer shrinks layer by layer from the inside to the outside, so that the overlapped fracture 2 is stepped, so that the gap between the overlapped fracture 2 and the insulation patch is stepped, rather than a straight seam, and the gap path is longer, and heat is not easily lost from the stepped gap. In addition, the cross section of at least one layer of the insulation material layer is a non-planar cross section, which further increases the gap path and reduces heat loss.
[0016] Specifically, at least one insulating material layer has a conical cross section 3, and for the insulating material layer with the conical cross section 3, the small diameter end of the conical cross section 3 is closer to the inside and the large diameter end is closer to the outside, that is, the small diameter end of the conical cross section 3 is closer to the buried pipe 1 than the large diameter end. Figure 1 As shown in the figure, a concave snap-in 4 is formed between the insulation material layer having a conical section 3 and its adjacent insulation material layer. When the insulation patch is installed between two overlapping fractures 2, due to the presence of the concave snap-in 4, the insulation patch will be stuck between the two overlapping fractures 2, thereby improving the insulation effect.
[0017] All the insulation material layers outside the buried pipe 1 have non-planar cross-sections, which extend the gap length between the overlapped fracture 2 and the insulation patch, and improve the insulation effect. All the insulation material layers outside the buried pipe 1 have conical cross-sections 3, and from the inside to the outside, the taper of the conical cross-section 3 of each insulation material layer decreases layer by layer, that is, the inner insulation material layer has a larger taper, and the outer insulation material layer has a smaller taper. The inner insulation material has a larger taper, which is convenient for the installation of the insulation patch. The outer insulation material has a smaller taper, and the inner concave bayonet 4 is deeper, which has a better snap-in effect on the insulation patch.
[0018] As attached Figure 1 In one embodiment shown, the multiple layers of thermal insulation material outside the buried pipe 1 are, from inside to outside, the first nano material layer 5, the second nano material layer 6, the third nano material layer 7, the first long-haired fiber felt layer 8, the high-temperature glass wool layer 9 and the second long-haired fiber felt layer 10. From inside to outside, each layer of thermal insulation material shrinks layer by layer. An outer sleeve 11 is provided outside the second long-haired fiber felt layer 10, and an air layer 12 is provided between the second long-haired fiber felt layer 10 and the outer sleeve 11. An anti-corrosion layer is also provided outside the outer sleeve 11. A reflective layer is provided outside any thermal insulation material layer to increase the thermal insulation effect of the thermal insulation material layer.
[0019] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.
Claims
1. A fracture overlap structure for underground pipe insulation, characterized in that: The invention comprises an underground pipe (1), wherein the underground pipe (1) has multiple layers of thermal insulation material outside, wherein the multiple layers of thermal insulation material form a cross section at the end of the underground pipe (1), and the cross sections of the multiple layers of thermal insulation material are combined into an overlapping fracture (2); at the overlapping fracture (2), each thermal insulation material layer is retracted layer by layer from the inside to the outside, so that the overlapping fracture (2) is stepped, and the cross section of at least one layer of the thermal insulation material layer is a non-planar cross section.
2. The fracture overlap structure for underground pipe insulation according to claim 1, characterized in that: At least one thermal insulation material layer has a conical cross section (3).
3. The fracture overlap structure for underground pipe insulation according to claim 2 is characterized in that: For the thermal insulation material layer with a conical section (3), the small diameter end of the conical section (3) is located inwardly, and the large diameter end is located outwardly, so that an inwardly concave slot (4) is formed between the thermal insulation material layer with a conical section (3) and its adjacent thermal insulation material layer.
4. The fracture overlap structure for underground pipe insulation according to claim 3 is characterized in that: All the thermal insulation material layers outside the buried pipe (1) have non-planar cross-sections.
5. The fracture overlap structure for underground pipe insulation according to claim 4, characterized in that: All the thermal insulation material layers outside the buried pipe (1) have a conical cross section (3), and the conical cross section (3) of each thermal insulation material layer decreases layer by layer from the inside to the outside.
6. The fracture overlap structure for underground pipe insulation according to any one of claims 1 to 5, characterized in that: The multiple layers of thermal insulation material outside the buried pipe (1) are, from the inside to the outside, a first nano material layer (5), a second nano material layer (6), a third nano material layer (7), a first long-haired fiber felt layer (8), a high-temperature glass wool layer (9), and a second long-haired fiber felt layer (10); an outer sleeve (11) is provided outside the second long-haired fiber felt layer (10), and an air layer (12) is provided between the second long-haired fiber felt layer (10) and the outer sleeve (11).
7. The fracture overlap structure for underground pipe insulation according to claim 6, characterized in that: A reflective layer is arranged outside any thermal insulation material layer.