Installation assembly for natural compensation section of directly-buried steam pipeline

Abstract

The utility model discloses a mounting component for natural compensation sections of a directly-buried steam pipeline, which relates to the technical field of heat supply of the directly-buried steam pipeline and comprises a prefabricated directly-buried steam heat preservation elbow and two natural compensation sections arranged at two ends of the prefabricated directly-buried steam heat preservation elbow, and fixing components are arranged on the two natural compensation sections. The two natural compensation sections are the same in structure and sequentially comprise a steam working pipeline, a pipeline heat preservation layer, a pipeline air layer and a pipeline outer protective sleeve which are coaxially arranged from inside to outside. The prefabricated directly-buried steam heat preservation elbow comprises a steam working hot-pressing elbow, an elbow heat preservation layer, an elbow air layer and an elbow outer protective sleeve from inside to outside. Therefore, according to the utility model, the offset of the natural compensation section can be carried out through a cold tightening means, and a part of the pipeline with overlarge displacement is cut off, so that the relative offset of the pipeline is reduced, the operation safety is improved, the engineering investment is saved, and the construction difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of direct-buried steam pipeline heating, in particular to an installation component for a natural compensation section of a direct-buried steam pipeline. Background Art

[0002] With the improvement of national environmental protection requirements, cogeneration units mainly based on industrial heat load have the advantages of high comprehensive energy utilization efficiency and energy saving and environmental protection, while steam heating pipelines play the role of a link between heat sources and urban industrial heat users.

[0003] Steam heating pipelines are generally at a high temperature. According to the material characteristics of the metal pipeline itself, the pipeline will expand under the action of the temperature of the conveying medium, resulting in a large displacement of the high-temperature steam pipeline. Therefore, in the design of steam pipelines, necessary measures must be taken to absorb the displacement caused by the thermal expansion of the pipeline. Usually, a flexible design is used to enable the pipeline to have the ability to absorb thermal displacement. The most common way is to use the elasticity of the metal pipeline itself to set a natural expansion bend (L-type, Z-type or π-type) for compensation.

[0004] If the displacement to be compensated is too large, it is necessary to increase the pipe diameter by reducing the diameter near the elbow where the displacement is larger to meet the compensation amount of the steam pipe. However, the increase in pipe diameter will cause the civil engineering direct buried trench to become wider and deeper, thereby increasing the investment in pipes and civil engineering projects, and the difficulty of civil engineering construction will also increase accordingly. Utility Model Content

[0005] In view of the above problems, the purpose of the utility model is to provide an installation component for the natural compensation section of a directly buried steam pipeline.

[0006] The component can offset the steam working pipe by cold tightening, shorten a portion of the pipe with excessive displacement, thereby reducing the relative offset of the pipe, improving operation safety, saving project investment, and reducing construction difficulty.

[0007] The above-mentioned objects and other objects are achieved by the features of the independent claims, and further implementations are reflected in the dependent claims, the description and the drawings.

[0008] To achieve the above-mentioned purpose, the utility model proposes an installation component for a natural compensation section of a directly buried steam pipeline, comprising a first directly buried steam pipeline and a second directly buried steam pipeline, wherein the first directly buried steam pipeline is fixed with the first direct buried steam pipeline natural compensation section at one end, and the second directly buried steam pipeline is fixed with the second direct buried steam pipeline natural compensation section at one end, and the first direct buried steam pipeline natural compensation section and the second direct buried steam pipeline natural compensation section are respectively fixedly connected to the two ends of a prefabricated directly buried steam insulation elbow, and the first direct buried steam pipeline and the second direct buried steam pipeline are connected and communicated through the prefabricated directly buried steam insulation elbow;

[0009] The first direct buried steam pipeline natural compensation section and the second direct buried steam pipeline natural compensation section are provided with fixing components;

[0010] The first direct buried steam pipeline natural compensation section has the same structure as the second direct buried steam pipeline natural compensation section, and includes, from inside to outside, a coaxially arranged steam working pipeline, a pipeline insulation layer, a pipeline air layer, and a pipeline outer sheath pipe;

[0011] The prefabricated direct-buried steam insulation elbow comprises, from inside to outside, a coaxially arranged steam working hot-pressed elbow, an elbow insulation layer, an elbow air layer and an elbow outer sheath pipe.

[0012] In addition, the installation assembly for the natural compensation section of a directly buried steam pipeline according to the above embodiment of the utility model may also have the following additional technical features:

[0013] In one embodiment, the steam working pipe and the pipe insulation layer are fixedly fitted.

[0014] In one embodiment, the fixing assembly includes a plurality of planar sliding brackets, a guide bracket, and a fixing bracket arranged in the air layer of the pipeline;

[0015] The fixing bracket is arranged at a side away from the prefabricated direct-buried steam insulation elbow, and fixedly connects the adjacent pipe insulation layer and the outer sheath pipe of the pipe;

[0016] A plurality of the planar sliding brackets are arranged at equal intervals on the pipe insulation layer close to one side of the prefabricated direct-buried steam insulation elbow;

[0017] The guide bracket is arranged on the pipeline insulation layer between the planar sliding bracket and the fixed bracket;

[0018] The plane sliding bracket and the guide bracket are fixedly connected to the steam working pipeline and the pipeline insulation layer, and the plane sliding bracket and the guide bracket are slidably connected to the outer sheath pipe of the pipeline.

[0019] In one embodiment, the overall structure is L-shaped after the first direct-buried steam pipe natural compensation section, the second direct-buried steam pipe natural compensation section and the prefabricated direct-buried steam insulation elbow are connected.

[0020] In one embodiment, the connection method between the steam working pipeline and the steam working hot-pressing elbow and the connection method between the pipeline outer sheath pipe and the elbow outer sheath pipe are both welding or riveting.

[0021] In one embodiment, a portion of the connection between the pipeline insulation layer and the elbow insulation layer overlaps.

[0022] Specifically, the material of the pipeline insulation layer 102 and the elbow insulation layer 302 is polyurethane foam, silica aerogel or centrifugal glass wool.

[0023] In one embodiment, the surfaces of the pipeline outer sheath pipe and the elbow outer sheath pipe are both coated with a corrosion-resistant coating.

[0024] Specifically, the corrosion-resistant coating is a metal plating layer or a paint layer.

[0025] The beneficial effects of the utility model compared with the prior art are:

[0026] The installation assembly of the utility model can be used to install the natural compensation section eccentrically by cold tightening means, shorten a portion of the pipeline with excessive displacement, thereby reducing the relative offset of the pipeline, improving operation safety, saving project investment, and reducing construction difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A plan view of an installation assembly provided in an embodiment of the utility model;

[0029] Figure 2 A schematic diagram of the cold-tightening structure before and after the embodiment of the utility model;

[0030] Figure 3 A schematic diagram of the structure of a direct buried steam pipeline provided by an embodiment of the utility model;

[0031] Figure 4 A schematic diagram of the structure of a prefabricated direct buried steam insulation elbow provided in an embodiment of the utility model;

[0032] Among them: 1-the first direct buried steam pipeline natural compensation section, 101-steam working pipeline, 102-pipeline insulation layer, 103-pipeline air layer, 104-pipeline outer jacket pipe, 2-the second direct buried steam pipeline natural compensation section, 3-prefabricated direct buried steam insulation elbow, 301-steam working elbow, 302-elbow insulation layer, 303-elbow air layer, 304-elbow outer jacket pipe, 4-plane sliding bracket, 5-guide bracket, 6-fixed bracket. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0034] like Figure 1 As shown, the embodiment of the present application discloses an installation assembly for a natural compensation section of a directly buried steam pipeline, including a first directly buried steam pipeline and a second directly buried steam pipeline, characterized in that: a first directly buried steam pipeline natural compensation section 1 is fixed at one end of the first directly buried steam pipeline, a second directly buried steam pipeline natural compensation section 2 is fixed at one end of the second directly buried steam pipeline, the first directly buried steam pipeline natural compensation section 1 and the second directly buried steam pipeline natural compensation section 2 are respectively fixedly connected to both ends of a prefabricated directly buried steam insulation elbow 3, and the first directly buried steam pipeline is connected to the second directly buried steam pipeline through the prefabricated directly buried steam insulation elbow 3;

[0035] A fixing component is provided in the first direct buried steam pipeline natural compensation section 1 and the second direct buried steam pipeline natural compensation section 2;

[0036] The first direct buried steam pipeline natural compensation section 1 has the same structure as the second direct buried steam pipeline natural compensation section 2, and includes, from the inside to the outside, a coaxially arranged steam working pipeline 101, a pipeline insulation layer 102, a pipeline air layer 103, and a pipeline outer sheath pipe 104;

[0037] The prefabricated direct-buried steam insulation elbow 3 includes, from the inside to the outside, a coaxially arranged steam working hot pressure elbow 301, an elbow insulation layer 302, an elbow air layer 303 and an elbow outer sheath pipe 304.

[0038] The utility model is used for the installation component of the natural compensation section of the directly buried steam pipeline. The natural compensation section can be installed eccentrically by cold tightening means, and a portion of the pipeline with excessive displacement can be shortened, thereby reducing the relative offset of the pipeline, improving operation safety, saving project investment, and reducing construction difficulty.

[0039] Specifically, the steam working pipe 101 and the pipe insulation layer 102 in the embodiment of the present application are fixedly fitted together, which can reduce the thermal resistance between the insulation layer and the working layer, improve the insulation effect of the steam pipe, and reduce heat energy loss.

[0040] Specifically, the fixed assembly in the embodiment of the present application includes a plurality of planar sliding brackets 4, a guide bracket 5, and a fixed bracket 6 arranged in the pipeline air layer 103;

[0041] The fixing bracket 6 is arranged on a side away from the prefabricated direct buried steam insulation elbow 3, and fixedly connects the adjacent pipeline insulation layer 102 with the pipeline outer sheath pipe 104;

[0042] A plurality of plane sliding brackets 4 are arranged at equal intervals on the pipe insulation layer 102 near one side of the prefabricated direct buried steam insulation elbow 3;

[0043] The guide bracket 5 is arranged on the pipeline insulation layer 102 between the plane sliding bracket 4 and the fixed bracket 6;

[0044] The plane sliding bracket 4 , the guide bracket 5 are fixedly connected to the steam working pipeline 101 and the pipeline insulation layer 102 , and the plane sliding bracket 4 , the guide bracket 5 are slidably connected to the pipeline outer sheath pipe 104 .

[0045] The planar sliding bracket 4 cooperates with the guide bracket 5 to allow the pipeline to expand and move due to thermal expansion and contraction while maintaining smooth operation of the pipeline; the fixed bracket 6 can fix the end of the pipeline to prevent thermal displacement or vibration of the pipeline during operation, thereby ensuring the reasonable operation of the system.

[0046] After the first direct buried steam pipeline natural compensation section 1, the second direct buried steam pipeline natural compensation section 2 and the prefabricated direct buried steam insulation elbow 3 are connected, the overall structure is L-shaped.

[0047] Specifically, the first direct-buried steam pipe natural compensation section 1, the second direct-buried steam pipe natural compensation section 2 and the prefabricated direct-buried steam insulation elbow 3 in the embodiment of the present application are all steel-in-steel components, which can improve the durability and stability of the pipeline.

[0048] Specifically, the first direct-buried steam pipe natural compensation section 1, the second direct-buried steam pipe natural compensation section 2 and the prefabricated direct-buried steam insulation elbow 3 in the embodiment of the present application are all external sliding types.

[0049] The external sliding structure can effectively compensate for the thermal expansion and contraction of the pipeline due to temperature changes. When the length of the pipeline changes due to changes in the medium temperature, the compensation section cooperates with the internal plane sliding bracket 4 and the guide bracket 5 to absorb these changes and perform sliding thermal displacement, thereby reducing the stress and deformation of the pipeline itself or the connecting parts, protecting the integrity and safety of the pipeline system, and extending the service life.

[0050] Specifically, the connection method between the steam working pipe 101 and the steam working hot pressing elbow 301 and the connection method between the pipe outer sheath pipe 104 and the elbow outer sheath pipe 304 in the embodiment of the present application are both welding or riveting, which can provide good component connection and ensure the stability and safety of the pipeline system during operation.

[0051] Specifically, the material of the pipe insulation layer 102 and the elbow insulation layer 302 in the embodiment of the present application is selected from polyurethane foam, silica aerogel or centrifugal glass wool or other thermal insulation materials to provide good thermal insulation effect.

[0052] Specifically, the surfaces of the pipeline outer sheath tube 104 and the elbow outer sheath tube 304 in the embodiment of the present application are coated with a corrosion-resistant coating, which can improve their corrosion resistance and extend their service life.

[0053] Specifically, the corrosion-resistant coating in the embodiment of the present application is a coating made of a metal plating, a paint layer or other materials that can improve corrosion resistance, so as to further extend the service life of the pipeline.

[0054] The working principle of this installation component is as follows:

[0055] Direct buried steam pipelines are generally constructed and installed at room temperature. They are in a state of high temperature and high pressure during normal operation. Due to the material characteristics of the pipeline itself, the steam pipeline will expand under this temperature difference, and the thermal expansion displacement is in the opposite direction of the fixed bracket 6, that is, the displacement is released through the elastic deformation of the elbow of the natural compensation section. Therefore, when constructing at room temperature, the steam working pipe 101 of the first direct buried steam pipeline natural compensation section 1 and the second direct buried steam pipeline natural compensation section 2 can be shortened by a certain length △XA (or △XB) by cold tightening to offset the steam working pipe 101, thereby reducing the relative thermal expansion offset of the first direct buried steam pipeline natural compensation section 1 and the second direct buried steam pipeline natural compensation section 2 (the absolute thermal expansion displacement remains basically unchanged), so as to achieve the release of the thermal displacement of the natural compensation section under the premise of keeping the outer diameter of the pipeline outer sheath pipe 104 unchanged or minimizing the increase in size, which specifically includes the following steps:

[0056] S1. Construction preparation: prefabricate the first direct buried steam pipeline, the second direct buried steam pipeline, the prefabricated direct buried steam insulation elbow 3 and the fixed components and transport them to the construction site;

[0057] S2, pipeline preinstallation: excavate trenches according to the preset route, lay the first direct buried steam pipeline and the second direct buried steam pipeline, and the prefabricated direct buried steam insulation elbow 3 in the corresponding trenches; place fixing components to fix the first direct buried steam pipeline natural compensation section 1 and the second direct buried steam pipeline natural compensation section 2; the first direct buried steam pipeline natural compensation section 1 and the second direct buried steam pipeline natural compensation section 2 are respectively fixedly connected to the two ends of the prefabricated direct buried steam insulation elbow 3;

[0058] S3. Parameter confirmation: The thickness of the air layer 103 of the pipeline in normal operation is a mm. The thermal displacement of the natural compensation section 1 of the first directly buried steam pipeline is ΔLA, the thermal displacement of the natural compensation section 2 of the second directly buried steam pipeline is ΔLB, and the clearance safety margin between the steam working pipeline 101 and the outer casing 104 of the pipeline is δ;

[0059] S4. Parameter calculation: According to the thickness a of the pipeline air layer, the thermal displacement ΔLA, the thermal displacement ΔLB, and the clearance safety margin δ, calculate the cold tightening amount ΔXA of the steam working pipeline 101 of the natural compensation section 1 of the first directly buried steam pipeline, and calculate the cold tightening amount ΔXB of the steam working pipeline 101 of the natural compensation section 2 of the second directly buried steam pipeline;

[0060] S5. Cold tightening offset installation: According to the cold tightening amounts ΔXA and ΔXB obtained in S4, perform corresponding cold tightening offset installations on the natural compensation section 1 of the first directly buried steam pipeline and the natural compensation section 2 of the second directly buried steam pipeline.

[0061] Specifically, the calculation methods of ΔXA and ΔXB are as follows:

[0062] When ΔLA + δ < a and ΔLB + δ < a, the thickness a of the pipeline air layer 103 of the natural compensation section 1 of the first directly buried steam pipeline and the natural compensation section 2 of the second directly buried steam pipeline satisfies the thermal displacement of the steam working pipeline 101 during normal operation. At this time, no cold tightening offset installation is required, that is, ΔXA = ΔXB = 0 mm;

[0063] When a ≤ ΔLA + δ < 2a and ΔLB + δ < a, the thickness a of the pipeline air layer 103 of the natural compensation section 2 of the second directly buried steam pipeline satisfies the thermal displacement ΔLB of the steam working pipeline 101 during normal operation. At this time, no cold tightening offset installation is required, that is, ΔXB = 0 mm. The thermal displacement ΔLA of the steam working pipeline 101 of the natural compensation section 1 of the first directly buried steam pipeline during normal operation exceeds the thickness a of the pipeline air layer 103. At this time, cold tightening offset installation is required for this section, and ΔXA = ΔLA / 2;

[0064] When a ≤ ΔLB + δ < 2a and ΔLA + δ < a, the thickness a of the pipeline air layer 103 of the natural compensation section 1 of the first directly buried steam pipeline satisfies the thermal displacement ΔLA of the steam working pipeline 101 during normal operation. At this time, no cold tightening offset installation is required, that is, ΔXA = 0 mm. The thermal displacement ΔLB of the steam working pipeline 101 of the natural compensation section 2 of the second directly buried steam pipeline during normal operation exceeds the thickness a of the pipeline air layer 103. At this time, cold tightening offset installation is required for this section, and ΔXB = ΔLB / 2;

[0065] When a≤△LA+δ<2a, a≤△LB+δ<2a, the thermal displacements △LA and △LB of the steam working pipe 101 of the first direct buried steam pipe natural compensation section 1 and the second direct buried steam pipe natural compensation section 2 during normal operation exceed the thickness a of the pipe air layer 103. At this time, both sections need to be cold-tightened and offset, △XA=△LA / 2, △XB=△LB / 2.

[0066] It can be seen that the utility model of an installation component for a natural compensation section of a directly buried steam pipeline can perform eccentric installation of the natural compensation section by cold tightening means, shorten a portion of the pipeline with excessive displacement, thereby reducing the relative offset of the pipeline, improving operational safety, saving project investment, and reducing construction difficulty.

[0067] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is limited by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0068] The utility model uses specific examples to illustrate the principle and implementation of the utility model. The above is only the preferred implementation of the utility model and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made to it without departing from the principle and spirit of the utility model shall be included in the protection scope of the utility model.

Claims

1. An installation assembly for a natural compensation section of a directly buried steam pipeline, comprising a first directly buried steam pipeline and a second directly buried steam pipeline, characterized in that: A first direct buried steam pipe natural compensation section (1) is fixed to one end of the first direct buried steam pipe, and a second direct buried steam pipe natural compensation section (2) is fixed to one end of the second direct buried steam pipe. The first direct buried steam pipe natural compensation section (1) and the second direct buried steam pipe natural compensation section (2) are respectively fixedly connected to two ends of a prefabricated direct buried steam insulation elbow (3), and the first direct buried steam pipe and the second direct buried steam pipe are connected and communicated through the prefabricated direct buried steam insulation elbow (3); The first direct buried steam pipeline natural compensation section (1) and the second direct buried steam pipeline natural compensation section (2) are provided with fixing components; The first direct-buried steam pipeline natural compensation section (1) and the second direct-buried steam pipeline natural compensation section (2) have the same structure, and comprise, from the inside to the outside, a coaxially arranged steam working pipeline (101), a pipeline insulation layer (102), a pipeline air layer (103), and a pipeline outer sheath pipe (104); The prefabricated direct-buried steam insulation elbow (3) comprises, from the inside to the outside, a coaxially arranged steam working hot-pressed elbow (301), an elbow insulation layer (302), an elbow air layer (303) and an elbow outer sheath pipe (304).

2. The installation assembly for the natural compensation section of a direct-buried steam pipeline according to claim 1 is characterized in that: The steam working pipe (101) and the pipe insulation layer (102) are fixedly fitted together.

3. The installation assembly for the natural compensation section of a direct-buried steam pipeline according to claim 2 is characterized in that: The fixing assembly comprises a plurality of planar sliding brackets (4), a guide bracket (5) and a fixing bracket (6) arranged in the air layer (103) of the pipeline; The fixing bracket (6) is arranged on a side away from the prefabricated direct-buried steam insulation elbow (3), and fixedly connects the adjacent pipeline insulation layer (102) and the pipeline outer sheath pipe (104); A plurality of the planar sliding brackets (4) are arranged at equal intervals on the pipeline insulation layer (102) close to one side of the prefabricated direct-buried steam insulation elbow (3); The guide bracket (5) is arranged on the pipeline insulation layer (102) between the planar sliding bracket (4) and the fixed bracket (6); The plane sliding bracket (4), the guide bracket (5) are fixedly connected to the steam working pipeline (101) and the pipeline insulation layer (102), and the plane sliding bracket (4), the guide bracket (5) are slidably connected to the pipeline outer sheath pipe (104).

4. The installation assembly for the natural compensation section of a direct-buried steam pipeline according to claim 1 is characterized in that: After the first direct-buried steam pipeline natural compensation section (1), the second direct-buried steam pipeline natural compensation section (2) and the prefabricated direct-buried steam insulation elbow (3) are connected, the overall structure is L-shaped.

5. The installation assembly for the natural compensation section of a direct-buried steam pipeline according to claim 1 is characterized in that: The connection method between the steam working pipeline (101) and the steam working hot-pressing elbow (301) and the connection method between the pipeline outer sheath pipe (104) and the elbow outer sheath pipe (304) are both welding or riveting.

6. The installation assembly for the natural compensation section of a direct-buried steam pipeline according to claim 1 is characterized in that: The connection between the pipeline insulation layer (102) and the elbow insulation layer (302) partially overlaps.

7. The installation assembly for the natural compensation section of a direct-buried steam pipeline according to claim 1 is characterized in that: The material of the pipeline insulation layer (102) and the elbow insulation layer (302) is polyurethane foam, silica aerogel or centrifugal glass wool.

8. The installation assembly for the natural compensation section of a direct-buried steam pipeline according to claim 1 is characterized in that: The surfaces of the pipeline outer sheath pipe (104) and the elbow outer sheath pipe (304) are both coated with a corrosion-resistant coating.

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