Steel-in-steel direct-buried steam heat preservation pipe

Abstract

The utility model relates to a steam heat preservation pipe technical field, specifically disclose a kind of steel jacketed steel direct-buried steam heat preservation pipe, including coaxially arranged inner working pipe and outer sheath pipe, the outer surface of outer sheath pipe is fixedly connected with annular reinforcing rib, the inner working pipe is fixed between outer sheath pipe with connecting structure, the connecting structure is respectively arranged in pipeline axial both ends, the connecting structure includes multiple circumferentially distributed connecting rib, outer sheath pipe is additionally reinforced rib, and the ability of anti-soil pressure and geological subsidence deformation is greatly improved, effectively protect the heat preservation layer is not crushed failure, double-layer heat preservation layer combines intermediate vacuum partition structure, substantially improve the long-term heat preservation efficiency and stability of high-temperature steam delivery, significantly reduce heat loss, overall structure design is reasonable, alloy steel material ensures strength and corrosion resistance, significantly improve the safety reliability, heat preservation durability and service life of pipeline in complex working conditions such as deep burying, intersection, settlement.

Description

Technical Field

[0001] This utility model relates to the field of steam insulation pipe technology, and specifically discloses a steel-clad steel direct-buried steam insulation pipe. Background Technology

[0002] Steel-jacketed direct-buried steam insulated pipes are a key infrastructure of urban centralized heating systems, achieving safe transportation of high-temperature steam through a double-layered steel pipe nesting structure. With the acceleration of urbanization, these pipelines increasingly face complex operating conditions such as deep burial, road intersections, and geological subsidence, placing higher demands on the pipeline's structural strength, long-term insulation performance, and resistance to environmental corrosion.

[0003] The current mainstream steel-jacketed direct-buried steam insulation pipes have systemic shortcomings in engineering applications: the outer protective pipe is prone to deformation under soil pressure due to the lack of efficient reinforcement structure, which leads to the compression failure of the insulation layer; the mechanical connection between the working pipe and the outer protective pipe is not stable enough, and stress concentration is easily caused during thermal displacement; the performance of the insulation layer material degrades significantly under high temperature and high humidity environments, and the existing single insulation structure is difficult to balance thermal insulation efficiency and durability. Utility Model Content

[0004] This utility model proposes a steel-jacketed direct-buried steam insulation pipe. The addition of reinforcing ribs to the outer protective pipe greatly enhances its resistance to soil pressure and geological settlement deformation, effectively protecting the insulation layer from being crushed and failing. The double insulation layer combined with the intermediate vacuum partition structure significantly improves the long-term insulation efficiency and stability of high-temperature steam transportation.

[0005] This utility model is implemented as follows: a steel-clad steel direct-buried steam insulation pipe includes an inner working pipe and an outer protective pipe arranged coaxially, and the outer surface of the outer protective pipe is fixedly connected with an annular reinforcing rib.

[0006] The inner working pipe and the outer protective pipe are fixed by a connecting structure, which is respectively set at both ends of the pipe axial direction. The connecting structure includes multiple circumferentially distributed connecting ribs.

[0007] An inner insulation layer, a vacuum isolation layer, and an outer insulation layer are sequentially arranged between the inner working pipe and the outer protective pipe from the inside to the outside.

[0008] As a preferred embodiment of the steel-jacketed direct-buried steam insulation pipe of this utility model, the connecting rib is a cylindrical steel component, with its two ends welded to the outer wall of the inner working pipe and the inner wall of the outer protective pipe, respectively.

[0009] As a preferred embodiment of the steel-clad steel direct-buried steam insulation pipe of this utility model, the vacuum isolation layer is an aluminum foil composite film sealing layer.

[0010] As a preferred embodiment of the steel-jacketed direct-buried steam insulation pipe of this utility model, the inner insulation layer is an aluminum silicate fiber blanket with a thickness of 40-60mm, and the outer insulation layer is polyurethane foam with a density ≥80kg / m³. 3 .

[0011] As a preferred embodiment of the steel-jacketed direct-buried steam insulation pipe of this utility model, the reinforcing ribs are provided in multiple ways, and the depth of the ribs is 40%-60% of the thickness of the outer protective pipe wall, with an adjacent spacing of 1.5-2.0m.

[0012] As a preferred embodiment of the steel-clad steel direct-buried steam insulation pipe of this utility model, both the inner working pipe and the outer protective pipe are made of alloy steel.

[0013] As a preferred embodiment of the steel-clad steel direct-buried steam insulation pipe of this utility model, the annular gap between the inner working pipe and the outer protective pipe is 80-120mm.

[0014] The beneficial effects of this utility model are:

[0015] This invention significantly enhances the overall performance of steel-jacketed direct-buried steam insulation pipes. The addition of reinforcing ribs to the outer protective pipe greatly improves its resistance to soil pressure and geological settlement deformation, effectively protecting the insulation layer from crushing and failure. The connection structure, through the dispersed arrangement of rigid connecting ribs, significantly improves the coordination between the inner and outer pipes during thermal displacement, effectively dispersing stress and avoiding concentrated damage. The double-layer insulation layer combined with the intermediate vacuum partition structure greatly improves the long-term insulation efficiency and stability of high-temperature steam transportation, significantly reducing heat loss. The overall structural design is reasonable, and the alloy steel material ensures strength and corrosion resistance, significantly improving the safety, reliability, insulation durability, and service life of the pipeline under complex working conditions such as deep burial, intersections, and settlement. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a structural diagram of the present invention;

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0019] The markings in the diagram are: 1. Inner working pipe; 2. Outer protective pipe; 3. Inner insulation layer; 4. Outer insulation layer; 5. Vacuum partition layer; 6. Reinforcing rib; 7. Connecting rib. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0021] Please see Figure 1-2 A steel-jacketed direct-buried steam insulation pipe includes an inner working pipe 1 and an outer protective pipe 2 arranged coaxially, and an annular reinforcing rib 6 is fixedly connected to the outer surface of the outer protective pipe 2.

[0022] The inner working pipe 1 and the outer protective pipe 2 are fixed by a connecting structure. The connecting structure is respectively set at both ends of the pipe axial direction. The connecting structure includes multiple circumferentially distributed connecting ribs 7.

[0023] An inner insulation layer 3, a vacuum isolation layer 5, and an outer insulation layer 4 are sequentially arranged from the inside to the outside between the inner working pipe 1 and the outer protective pipe 2.

[0024] In this embodiment: the inner working pipe 1 and the outer protective pipe 2 constitute the core structure; to improve the ability of the outer protective pipe 2 to resist deep soil pressure, annular reinforcing ribs 6 are fixedly installed on its outer surface, which significantly enhances the ring stiffness and prevents deformation and crushing of the insulation layer; the inner working pipe 1 and the outer protective pipe 2 are fixedly connected at both ends of the axial direction by multiple circumferentially distributed connecting ribs 7, which effectively disperses thermal displacement stress and avoids stress concentration; between the inner and outer pipes, an inner insulation layer 3, a vacuum isolation layer 5 and an outer insulation layer 4 are sequentially installed from the inside to the outside. The inner insulation layer 3 directly wraps the inner working pipe 1 to achieve efficient heat insulation, the vacuum isolation layer 5 blocks radiation and convection heat transfer, and the outer insulation layer 4 provides the main insulation and fills the space. The three work together to greatly reduce heat loss during high-temperature steam transportation and improve long-term insulation stability.

[0025] As a technical optimization of this utility model, the connecting rib 7 is a cylindrical steel component, with its two ends welded to the outer wall of the inner working pipe 1 and the inner wall of the outer protective pipe 2, respectively.

[0026] In this embodiment, the connecting rib 7 is a cylindrical steel component welded at both ends, which ensures the rigidity and stability of the connection structure, can reliably transfer loads, and reduces deformation stress.

[0027] As a technical optimization of this utility model, the vacuum isolation layer 5 is an aluminum foil composite film sealing layer.

[0028] In this embodiment, the vacuum isolation layer 5 is made of aluminum foil composite film sealing layer, which effectively blocks heat radiation and gas convection heat conduction by forming a high vacuum environment, significantly improving the durability and efficiency of the overall thermal insulation performance.

[0029] As a technical optimization of this utility model, the inner insulation layer 3 is an aluminum silicate fiber blanket with a thickness of 40-60mm, and the outer insulation layer 4 is polyurethane foam with a density ≥80kg / m³. 3 .

[0030] In this embodiment: the inner insulation layer 3 is made of aluminum silicate fiber blanket of a specific thickness, which can withstand the high temperature steam environment of the inner working pipe 1. The outer insulation layer 4 is made of high-density polyurethane foam, which provides excellent thermal insulation performance and has sufficient strength to resist environmental pressure. The combination of the two takes into account both high temperature adaptability and efficient thermal insulation.

[0031] As a technical optimization of this utility model, multiple reinforcing ribs 6 are provided, and the depth of the ribs is 40%-60% of the thickness of the outer protective tube wall, with an adjacent spacing of 1.5-2.0m.

[0032] In this embodiment, multiple reinforcing ribs 6 are provided with specific rib depths and spacings to significantly enhance ring stiffness and prevent deformation from crushing the insulation layer.

[0033] As a technical optimization of this utility model, both the inner working tube 1 and the outer protective tube 2 are made of alloy steel.

[0034] In this embodiment, both the inner working pipe 1 and the outer protective pipe 2 are made of alloy steel, which gives the pipeline excellent structural strength, high temperature resistance and environmental corrosion resistance, ensuring long-term safe operation.

[0035] As a technical optimization of this utility model, the annular gap between the inner working tube 1 and the outer protective tube 2 is 80-120mm.

[0036] In this embodiment, an annular gap spacing of 80-120mm is set to provide the necessary space for arranging a multi-layer insulation structure of sufficient thickness, ensuring the achievement of the expected comprehensive insulation effect.

[0037] The working principle and usage process of this utility model are as follows: High-temperature steam is transported in the inner working pipe 1, and its heat is first blocked and absorbed by the tightly attached inner insulation layer 3; the heat transferred to the outside of the inner insulation layer 3 is effectively suppressed by the vacuum environment formed by the vacuum isolation layer 5, which prevents radiation and convection heat transfer; when the residual heat continues to be transferred outward, it is further blocked by the dense outer insulation layer 4; the outer protective pipe 2 bears the external soil pressure, traffic load and geological force, and the reinforcing ribs 6 on its outer surface significantly enhance its resistance to deformation and protect the internal insulation structure from being crushed.

[0038] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A steel-clad steel direct-buried steam insulation pipe, comprising an inner working pipe (1) and an outer protective pipe (2) arranged coaxially, characterized in that: The outer surface of the outer protective tube (2) is fixedly connected with a ring-shaped reinforcing rib (6). The inner working pipe (1) and the outer protective pipe (2) are fixed by a connecting structure. The connecting structure is respectively set at both ends of the pipe axial direction. The connecting structure includes multiple circumferentially distributed connecting ribs (7). The inner working tube (1) and the outer protective tube (2) are provided with an inner insulation layer (3), a vacuum isolation layer (5) and an outer insulation layer (4) from the inside to the outside.

2. The steel-jacketed direct-buried steam insulation pipe according to claim 1, characterized in that: The connecting rib (7) is a cylindrical steel component, with its two ends welded to the outer wall of the inner working pipe (1) and the inner wall of the outer protective pipe (2), respectively.

3. The steel-jacketed direct-buried steam insulation pipe according to claim 1, characterized in that: The vacuum isolation layer (5) is an aluminum foil composite film sealing layer.

4. The steel-jacketed direct-buried steam insulation pipe according to claim 1, characterized in that: The inner insulation layer (3) is an aluminum silicate fiber blanket with a thickness of 40-60 mm, and the outer insulation layer (4) is polyurethane foam with a density ≥80 kg / m³. 3 .

5. A steel-jacketed direct-buried steam insulation pipe according to claim 1, characterized in that: The reinforcing ribs (6) are provided in multiples, and the depth of the ribs is 40%-60% of the thickness of the outer protective tube wall, with an adjacent spacing of 1.5-2.0m.

6. A steel-jacketed direct-buried steam insulation pipe according to claim 1, characterized in that: Both the inner working tube (1) and the outer protective tube (2) are made of alloy steel.

7. A steel-jacketed direct-buried steam insulation pipe according to claim 1, characterized in that: The annular gap between the inner working tube (1) and the outer protective tube (2) is 80-120mm.

Images