Prefabricated overhead steam heat preservation elbow

Abstract

The utility model provides a prefabricated overhead steam heat preservation elbow which is characterized in that a plurality of heat preservation layers are arranged outside an elbow steel pipe body, and the plurality of heat preservation layers are sequentially composed of an inner heat preservation layer, an inner isolation layer, a soft and hard double-material composite heat preservation layer, an outer heat preservation layer, an outer isolation layer and an outer protection layer from inside to outside; the soft and hard double-material composite heat preservation layer is composed of hard heat preservation materials and soft heat preservation materials, the hard heat preservation materials and the soft heat preservation materials are sequentially arranged in the axial direction of the elbow steel pipe body in a staggered mode, the hard heat preservation materials are shrimp joint elbows made of calcium silicate tiles, and the soft heat preservation materials are aluminum silicate, glass wool and nanometer aerogel felt which are filled between the adjacent hard heat preservation materials. In the axial direction of the elbow steel pipe body, the hard heat preservation materials and the soft heat preservation materials are sequentially arranged in a staggered mode, the design can effectively prevent the heat preservation layer from falling, deforming and shifting caused by pipeline expansion in the operation process, the overall strength and stability of the heat preservation layer are improved, and damage to the heat preservation layer caused by external collision is reduced.

Description

Technical Field

[0001] The utility model relates to the field of steam insulation, in particular to a prefabricated overhead steam insulation elbow. Background Art

[0002] In the field of steam heating, with the release and use of the group standard "TCDHA 2-2019 Prefabricated Steam Insulation Pipes and Fittings for Overhead and Integrated Pipe Galleries", the application of prefabricated steam insulation pipes has become more and more extensive, with more and more cases, making a great contribution to the country's energy conservation and emission reduction.

[0003] However, during the use of this product, customers are increasingly concerned about how to further improve the overall performance of the steam network, especially how to reduce the additional heat dissipation loss of the steam network, while improving the weather resistance and safety of the network. In the current operation of the network, the insulation effect at the elbow is poor and it is easy to be damaged. The main reasons for this situation are:

[0004] 1. In order to save costs, most elbows are still wrapped with soft insulation cotton on site;

[0005] 2. During operation, the pipe expansion at the elbow is large, causing the elbow insulation to fall off, deform and shift, thereby creating insulation gaps and increasing heat dissipation losses;

[0006] 3. Since most of the elbows are arranged at pedestrian turning points, they are particularly easy to be bumped by pedestrians and vehicles. At the same time, because the outer layer of the soft insulation is not strong enough, the deformation after being bumped is particularly large and difficult to recover, resulting in heat loss.

[0007] Therefore, on-site insulation of the elbow will greatly increase the overall heat dissipation and reduce the operating efficiency after a period of operation. Utility Model Content

[0008] In view of the problems raised in the above technical background, the utility model provides a new type of steam pipe network elbow insulation structure, which aims to significantly improve the insulation effect of the steam pipe network elbow, enhance the weather resistance and safety of the pipe network, reduce heat dissipation loss, and improve the overall operation efficiency of the pipe network. The specific plan is as follows:

[0009] A prefabricated overhead steam insulation elbow, the prefabricated overhead steam insulation elbow comprising an elbow steel pipe body, a multi-layer insulation layer is arranged outside the elbow steel pipe body, and both ends of the elbow steel pipe body are reserved with connection ends exposed to the outside for connection with a working steel pipe, the multi-layer insulation layer is composed of an inner insulation layer, an inner isolation layer, a soft and hard dual-material composite insulation layer, an outer insulation layer, an outer isolation layer and an outer protective layer from the inside to the outside;

[0010] The soft and hard dual-material composite insulation layer is composed of hard insulation material and soft insulation material arranged alternately in sequence in the axial direction of the elbow steel pipe body. The hard insulation material is a shrimp-joint elbow made of calcium silicate tiles, and the soft insulation material is aluminum silicate, glass wool, and nano aerogel felt filled between adjacent hard insulation materials.

[0011] Furthermore, the outer insulation layer is polyurethane foam.

[0012] Furthermore, the material of the inner insulation layer and / or the outer insulation layer is microporous calcium silicate tile or glass wool felt.

[0013] Furthermore, the connection end is connected to the working steel pipe by welding.

[0014] The advantages of the utility model are:

[0015] 1. Multi-layer insulation layer design: The prefabricated overhead steam insulation elbow of the utility model adopts a multi-layer insulation layer design, which includes inner insulation layer, inner isolation layer, soft and hard dual-material composite insulation layer, outer insulation layer, outer isolation layer and outer protective layer from inside to outside. This multi-layer design can not only effectively reduce heat loss and improve the insulation effect, but also each layer of insulation material has its specific function and role, which together improves the weather resistance and safety of the pipeline network.

[0016] 2. Soft and hard dual-material composite insulation layer: In the axial direction of the elbow steel pipe body, the hard insulation material and the soft insulation material are arranged alternately in sequence. This design can not only effectively prevent the insulation layer from falling off, deforming and shifting due to pipeline expansion during operation, but also improve the overall strength and stability of the insulation layer, and reduce the damage to the insulation layer caused by external bumps.

[0017] 3. Selection of high-quality thermal insulation materials: The thermal insulation materials selected for this utility model are all high-performance and high-durability materials, such as calcium silicate tiles, aluminum silicate, glass wool, nanomaterials, etc. These materials not only have good thermal insulation effects, but also have excellent weather resistance and corrosion resistance, and can operate stably for a long time in harsh environments.

[0018] 4. Reserved connection end design: The utility model reserves exposed connection ends at both ends of the elbow steel pipe body, which is convenient for connection with the working steel pipe. This design not only simplifies the installation process and improves construction efficiency, but also ensures the tightness and stability of the connection and reduces heat loss caused by poor connection.

[0019] The prefabricated overhead steam insulation elbow provided by the utility model has the advantages of multi-layer insulation layer design, soft and hard dual-material composite insulation layer, high-quality insulation material selection, reserved connection end design and welding connection method, which can significantly improve the insulation effect at the elbow of the steam pipe network, enhance the weather resistance and safety of the pipe network, reduce heat dissipation loss, and improve the overall operation efficiency of the pipe network. At the same time, the utility model also has the advantages of simple structure, easy installation, low maintenance cost, etc., and has broad application prospects and market potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 1 is a top cross-sectional view of a prefabricated overhead steam insulation elbow of the utility model in one embodiment;

[0022] Figure 2 This is a schematic diagram of welding insulation steel pipes at both ends of the insulation elbow of the utility model in one embodiment;

[0023] Figure 3 for Figure 1 Sectional view in the AA direction;

[0024] Figure 4 for Figure 1 Cross-sectional view along the BB direction. DETAILED DESCRIPTION

[0025] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0026] In order to thoroughly understand the present invention, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0027] Reference Figure 1-4As shown, the utility model provides a prefabricated overhead steam insulation elbow, which comprises an elbow steel pipe body 1, a multi-layer insulation layer is arranged outside the elbow steel pipe body 1, and both ends of the elbow steel pipe body 1 are reserved with exposed connection ends for connection with a working steel pipe 8, and the multi-layer insulation layer is composed of an inner insulation layer 2, an inner isolation layer 3, a soft and hard dual-material composite insulation layer 4, an outer insulation layer 5, an outer isolation layer 6 and an outer protective layer 7 from the inside to the outside.

[0028] The soft and hard dual-material composite insulation layer 4 is composed of hard insulation material 41 and soft insulation material 42 which are arranged alternately in the axial direction of the elbow steel pipe body 1. The hard insulation material 41 is a shrimp-joint elbow made of calcium silicate tiles, and the soft insulation material 42 is aluminum silicate, glass wool, and nano aerogel felt filled between adjacent hard insulation materials 41.

[0029] The isolation layer is arranged between two insulation materials or between different layers of the same insulation material. It is a material layer used to isolate the insulation layer. The isolation layer of the utility model uses the materials commonly used for isolation layers in the field. The specific materials are not improvements of the utility model and will not be elaborated here.

[0030] Nano aerogel felt is a flexible, thermal insulation felt that combines nano aerogel with inorganic fibers. It is specially used for thermal insulation of various high-temperature industrial pipelines, tanks and other curved equipment. It is a material with the lowest thermal conductivity among solids known so far. Aerogel felt is compounded with this nano material and is a soft, inorganic, environmentally friendly and easy-to-construct thermal insulation material.

[0031] In a preferred embodiment, the outer insulation layer 5 is polyurethane foam, which has good thermal insulation performance and impact resistance, can effectively reduce the heat dissipation loss of the steam pipe network, and improve the weather resistance and safety of the pipe network. The selection of polyurethane foam not only ensures the thermal insulation effect, but also makes the installation and maintenance of the entire prefabricated overhead steam insulation elbow more convenient due to its light weight and easy processing characteristics.

[0032] In order to further enhance the thermal insulation performance and mechanical strength of the outer thermal insulation layer 5, we add a certain proportion of reinforcing fibers inside it. These reinforcing fibers can be glass fibers, carbon fibers or other high-performance fibers, which can effectively improve the compression, tension and impact resistance of the polyurethane foam, making the thermal insulation elbow less likely to be damaged when subjected to external impact, thereby ensuring the durability of the thermal insulation effect.

[0033] In a preferred embodiment, the material of the inner insulation layer 2 and / or the outer insulation layer 5 is microporous calcium silicate tiles or glass wool felt. The microporous calcium silicate tiles and glass wool felt can not only effectively reduce the transfer of heat and reduce the heat dissipation loss of the steam pipeline network, but also the lightweight characteristics of these materials also reduce the weight of the entire prefabricated overhead steam insulation elbow, making it easier to install and transport.

[0034] Furthermore, the utility model provides connection ends on both sides of the elbow steel pipe body 1, which are used for welding connection with the working steel pipe 8. This design enables the prefabricated overhead steam insulation elbow of the utility model to be easily connected with other pipeline components to form a complete steam pipe network system.

[0035] Embodiment 1

[0036] The preparation method of the utility model is as follows:

[0037] 1. Support and fix the elbow steel pipe body 1.

[0038] 2. Wrap the inner insulation layer 2 on the elbow steel pipe body 1, and then wrap the inner isolation layer 3 on the surface of the inner insulation layer 2.

[0039] 3. Cut the calcium silicate tiles into shrimp-shaped sections as the hard thermal insulation material 41 and wrap them in sections outside the inner thermal insulation layer 2, leaving a certain thermal insulation space between the end faces of two adjacent hard thermal insulation materials 41.

[0040] 4. Fill the soft thermal insulation material 42 between the hard thermal insulation materials 41; during the filling process, pre-compress the soft thermal insulation material to ensure that the thermal insulation space is filled solidly and has a certain resilience.

[0041] 5. The surfaces of the hard heat-insulating material 41 and the filling soft heat-insulating material 42 are processed to be flat and then wrapped with an outer isolation layer 6 .

[0042] 6. Foaming polyurethane outside the outer isolation layer 6 forms an outer thermal insulation layer 5.

[0043] 7. Wrap the outer protective layer 7 outside the outer insulation layer 5 to form a prefabricated overhead steam insulation elbow finished product.

[0044] 8. Protect the finished products before transportation.

[0045] Embodiment 2

[0046] For small-diameter elbows and prefabricated insulated elbows with special requirements, in order to facilitate the construction of the insulation layer, the working steel pipes 8 can be pre-welded at both ends of the elbow steel pipe body 1. The length of the working steel pipe 8 is determined according to actual needs. After welding is completed, the same production process as in Example 1 is carried out after the X-ray inspection is qualified.

[0047] The elbow provided by the utility model is in the factory state. When installed in a cold state, the uninsulated head connection end of the elbow is welded to the butted working pipe, and the interface is insulated after passing the inspection; when running in a hot state, the insulation pipe is laid with two compensation forms. When the pipeline adopts a rotary compensator, the elbow will not bend and deform, and the structure of the elbow insulation will not change, which is consistent with the cold state; when the pipeline adopts natural compensation, a group of natural compensation consists of 4 90-degree elbows. At this time, the elbow will deform to absorb the thermal expansion of the pipeline. Since the prefabricated overhead steam insulation elbow of the utility model adopts a process that combines soft and hard insulation, when the elbow is extruded and deformed, the elbow angle will be less than 90 degrees. At this time, the soft insulation material 42 filled will be compressed and deformed, and will not cause extrusion and fragmentation under the full hard insulation material; at the same time, when the elbow is stretched and deformed, the elbow angle will be greater than 90 degrees. At this time, the soft insulation material 42 filled will rebound and fill the cracks caused by the stretching, and will not cause insulation vacancies under the full hard insulation material. At the same time, the outermost polyurethane outer insulation layer 5 has a certain elastic deformation ability and waterproof ability. No matter what the working conditions are, it will protect the elbow as a complete whole and prevent the erosion of rainwater.

[0048] The use of prefabricated overhead steam insulation elbows can greatly improve the efficiency of pipeline on-site construction, and can well ensure the operation effect under hot conditions, thereby improving the thermal efficiency, weather resistance and safety of the overall pipeline network.

[0049] The above describes the preferred embodiments of the utility model. It should be understood that the utility model is not limited to the above-mentioned specific implementation methods, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the utility model without departing from the scope of the technical solution of the utility model, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the utility model. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of protection of the technical solution of the utility model.

Claims

1. A prefabricated overhead steam insulation elbow, the prefabricated overhead steam insulation elbow comprising an elbow steel pipe body (1), a plurality of insulation layers are arranged outside the elbow steel pipe body (1), and both ends of the elbow steel pipe body (1) are reserved with exposed connection ends for connection with a working steel pipe (8), characterized in that: The multi-layer thermal insulation layer is composed of, from the inside to the outside, an inner thermal insulation layer (2), an inner isolation layer (3), a soft and hard dual-material composite thermal insulation layer (4), an outer thermal insulation layer (5), an outer isolation layer (6) and an outer protective layer (7); The hard-soft dual-material composite insulation layer (4) is composed of hard insulation material (41) and soft insulation material (42) which are arranged alternately in sequence in the axial direction of the elbow steel pipe body (1); the hard insulation material (41) is a shrimp-shaped elbow made of calcium silicate tiles, and the soft insulation material (42) is aluminum silicate, glass wool or nano-aerogel felt filled between adjacent hard insulation materials (41).

2. A prefabricated overhead steam insulation elbow as claimed in claim 1, characterized in that: The outer thermal insulation layer (5) is polyurethane foam.

3. A prefabricated overhead steam insulation elbow as claimed in claim 1, characterized in that: The material of the inner thermal insulation layer (2) and / or the outer thermal insulation layer (5) is microporous calcium silicate tile or glass wool felt.

4. A prefabricated overhead steam insulation elbow as claimed in claim 1, characterized in that: The connection end is connected to the working steel pipe (8) by welding.

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