Prefabricated overhead thermal-insulation steam elbow

Abstract

A prefabricated overhead thermal-insulation steam elbow, comprising an elbow steel pipe body (1), wherein a plurality of thermal insulation layers are provided outside the elbow steel pipe body. The plurality of thermal insulation layers sequentially comprise, from inside to outside, a thermal insulation layer (2), an inner thermal isolation layer (3), a soft-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 soft-hard dual-material composite thermal insulation layer (4) is composed of hard thermal insulation material (41) and soft thermal insulation material (42) which are alternately arranged in sequence in the axial direction of the elbow steel pipe body (1); the hard thermal insulation material is a gored elbow formed by calcium silicate tiles; and the soft thermal insulation material is aluminum silicate, glass wool, and nano-aerogel felt filling the space between adjacent hard thermal insulation material sections. The structure can not only effectively avoid falling-off, deformation and shifting of the thermal insulation layers due to pipe expansion during operation, but also can enhance the overall strength and stability of the thermal insulation layers, thereby reducing damage to the thermal insulation layers caused by external collision.

Description

A prefabricated overhead steam insulation elbow Technical Field

[0001] This utility model relates to the field of steam insulation, specifically to a prefabricated overhead steam insulation elbow. Background Technology

[0002] In the field of steam heating, with the release and use of the group standard "TCDHA2-2019 Prefabricated Steam Insulated Pipes and Fittings for Overhead and Integrated Pipe Gallery", the application of prefabricated steam insulated pipes is becoming more and more widespread, and there are 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 pipeline network, especially how to reduce additional heat loss while improving its weather resistance and safety. Currently, the insulation at elbows is inadequate and easily damaged. The main reasons for this situation are:

[0004] 1. In order to save costs, most elbows still use the method of wrapping soft insulation cotton on site;

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

[0006] 3. Since most of the bends are located at pedestrian bends, they are particularly vulnerable to collisions with pedestrians and vehicles. At the same time, because the outer layer of soft insulation is not strong enough, the deformation after being hit is particularly large and difficult to recover, resulting in heat loss.

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

[0008] Utility Model Content

[0009] To address the problems mentioned in the above technical background, this utility model provides a novel insulation structure for steam pipeline elbows, aiming to significantly improve the insulation effect at steam pipeline elbows, enhance the weather resistance and safety of the pipeline network, reduce heat loss, and improve the overall operating efficiency of the pipeline network. The specific solution is as follows:

[0010] A prefabricated overhead steam insulation elbow includes an elbow steel pipe body, with multiple insulation layers provided outside the elbow steel pipe body, and both ends of the elbow steel pipe body having exposed connection ends for connection with a working steel pipe. The multiple insulation layers are 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 out.

[0011] The dual-material composite insulation layer consists of rigid insulation material and flexible insulation material arranged alternately in the axial direction of the elbow steel pipe body. The rigid insulation material is a shrimp-shaped elbow made of calcium silicate tiles, and the flexible insulation material is aluminum silicate, glass wool, and nano aerogel felt filled between adjacent rigid insulation materials.

[0012] Furthermore, the outer insulation layer is polyurethane foam.

[0013] Furthermore, the material of the inner insulation layer and / or the outer insulation layer is microporous calcium silicate tile or glass wool felt.

[0014] Furthermore, the connecting end is connected to the working steel pipe by welding.

[0015] The advantages of this utility model are:

[0016] 1. Multi-layer insulation design: The prefabricated overhead steam insulation elbow of this utility model adopts a multi-layer insulation design, which consists 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 out. 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.

[0017] 2. Dual-material composite insulation layer: In the axial direction of the elbow steel pipe body, rigid insulation material and soft insulation material are arranged alternately. This design can not only effectively prevent the insulation layer from falling off, deforming and shifting due to pipe 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 impact.

[0018] 3. Selection of high-quality thermal insulation materials: The thermal insulation materials selected in this utility model are all high-performance and high-durability materials, such as calcium silicate tiles, aluminum silicate, glass wool, and nanomaterials. 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.

[0019] 4. Design with pre-reserved connection ends: This utility model has pre-reserved exposed connection ends at both ends of the elbow steel pipe body, which facilitates 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, reducing heat loss caused by poor connection.

[0020] The prefabricated overhead steam insulation elbow provided by this utility model has advantages such as multi-layer insulation design, composite insulation layer of soft and hard materials, selection of high-quality insulation materials, reserved connection end design and welding connection method. It can significantly improve the insulation effect at the elbow of the steam pipeline network, enhance the weather resistance and safety of the pipeline network, reduce heat loss, and improve the overall operating efficiency of the pipeline network. At the same time, this utility model also has the advantages of simple structure, convenient installation and low maintenance cost, and has broad application prospects and market potential. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 is a top sectional view of a prefabricated overhead steam insulation elbow according to one embodiment of the present invention.

[0023] Figure 2 is a schematic diagram of welding insulated steel pipes to both ends of the insulated elbow of this utility model in one embodiment;

[0024] Figure 3 is a cross-sectional view along the AA direction in Figure 1;

[0025] Figure 4 is a cross-sectional view along the BB direction in Figure 1. Detailed Implementation

[0026] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0027] To fully understand this utility model, detailed steps and structures will be presented in the following description to illustrate the technical solution of this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0028] Referring to Figures 1-4, this utility model provides a prefabricated overhead steam insulation elbow. The prefabricated overhead steam insulation elbow includes an elbow steel pipe body 1. Multiple insulation layers are provided on the outside of the elbow steel pipe body 1, and the two ends of the elbow steel pipe body 1 are reserved with exposed connection ends for connection with the working steel pipe 8. The multiple insulation layers are 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 out.

[0029] The dual-material composite insulation layer 4 consists of rigid insulation material 41 and soft insulation material 42 arranged alternately in the axial direction of the elbow steel pipe body 1. The rigid insulation material 41 is a shrimp-shaped elbow made of calcium silicate tiles, and the soft insulation material 42 is aluminum silicate, glass wool, and nano aerogel felt filled between adjacent rigid insulation materials 41.

[0030] An isolation layer is placed between two insulation materials or between different layers of the same insulation material. It is a material layer used to isolate the insulation layers. The isolation layer of this utility model uses materials commonly used in isolation layers in the field. The specific materials are not improvements of this utility model and will not be described in detail here.

[0031] Nano-aerogel felt is a flexible, thermally insulating felt. This material combines nano-aerogel with inorganic fibers and is specifically designed for thermal insulation of high-temperature industrial pipelines, tanks, and other curved surface equipment. It is currently known to be a solid material with the lowest thermal conductivity. Aerogel felt, incorporating this nanomaterial, is a soft, inorganic, environmentally friendly, and easy-to-install thermal insulation material.

[0032] In a preferred embodiment, the outer insulation layer 5 is polyurethane foam, which has good thermal insulation performance and impact resistance, effectively reducing heat loss from the steam pipeline network and improving the network's weather resistance and safety. The selection of polyurethane foam not only ensures the insulation effect but also, due to its lightweight and easy-to-process characteristics, makes the installation and maintenance of the entire prefabricated overhead steam insulation elbow more convenient.

[0033] To further enhance the thermal insulation performance and mechanical strength of the outer insulation layer 5, we added a certain proportion of reinforcing fibers to its interior. These reinforcing fibers can be glass fiber, carbon fiber, or other high-performance fibers, which can effectively improve the compressive, tensile, and impact resistance of polyurethane foam, making the insulation elbow less prone to damage when subjected to external impacts, thereby ensuring the durability of the insulation effect.

[0034] In a preferred embodiment, the inner insulation layer 2 and / or the outer insulation layer 5 are made of microporous calcium silicate tiles or glass wool felt. Microporous calcium silicate tiles and glass wool felt can not only effectively reduce heat transfer and reduce heat loss of the steam pipe network, but also reduce the weight of the entire prefabricated overhead steam insulation elbow due to their lightweight properties, making it easier to install and transport.

[0035] Furthermore, this invention provides connecting ends on both sides of the elbow steel pipe body 1, which are used for welding connections with the working steel pipe 8. This design allows the prefabricated overhead steam insulation elbow of this invention to be easily connected with other pipe components to form a complete steam pipe network system.

[0036] Example 1

[0037] The preparation method of this utility model is as follows:

[0038] 1. Support and fix the body of the elbow steel pipe 1.

[0039] 2. Wrap an inner insulation layer 2 around the body 1 of the elbow steel pipe, and then wrap an inner isolation layer 3 around the surface of the inner insulation layer 2.

[0040] 3. The calcium silicate tiles are cut into shrimp-shaped sections and used as rigid insulation material 41 to wrap the inner insulation layer 2. A certain amount of insulation space is left on the end faces of two adjacent rigid insulation materials 41.

[0041] 4. Fill the spaces between the rigid insulation materials 41 with soft insulation material 42; during the filling process, pre-compress the soft insulation material to ensure that the insulation space is filled and has a certain degree of resilience.

[0042] 5. Smooth the surfaces of the rigid insulation material 41 and the soft insulation material 42, and wrap them with the outer insulation layer 6.

[0043] 6. Polyurethane foam is applied to the outer insulation layer 6 to form the outer insulation layer 5.

[0044] 7. Wrap an outer protective layer 7 around the outer insulation layer 5 to form a prefabricated overhead steam insulation elbow.

[0045] 8. Protect the finished product before transportation.

[0046] Example 2

[0047] For small-diameter elbows and prefabricated insulated elbows with special requirements, in order to facilitate the construction of the insulation layer, working steel pipes 8 can be pre-welded to both ends of the elbow steel pipe body 1. The length of the working steel pipe 8 is determined according to the actual needs. After the welding is completed, it needs to pass the radiographic inspection and then carry out the same manufacturing process as in Example 1.

[0048] The elbow provided by this utility model is in its factory-delivered state. During cold installation, the uninsulated end of the elbow is welded to the working pipe. After passing inspection, insulation is applied to the joint. During hot operation, the insulated pipe has two compensation methods. When the pipeline uses a rotary compensator, the elbow will not bend or deform, and the insulation structure of the elbow will remain unchanged, consistent with the cold state. When the pipeline uses natural compensation, a set of natural compensation consists of four 90-degree elbows. The elbows will deform to absorb the thermal expansion of the pipeline. Because the prefabricated overhead steam insulation elbow of this utility model uses a combination of soft and hard insulation, when the elbow undergoes extrusion deformation, the elbow angle will be less than 90 degrees. At this time, the soft insulation material 42 will be deformed under pressure, preventing crushing under the full hard insulation material. At the same time, when the elbow undergoes tensile deformation, the elbow angle will be greater than 90 degrees. At this time, the soft insulation material 42 will rebound and fill the cracks caused by stretching, preventing insulation gaps under the full hard insulation material. Meanwhile, the outermost polyurethane insulation layer 5 has a certain elastic deformation capacity and waterproof capability, which will protect the elbow as a complete whole under any working condition and prevent rainwater erosion.

[0049] The use of prefabricated overhead steam insulation elbows can greatly improve the efficiency of on-site pipeline construction and ensure good operation under hot conditions, thereby improving the overall pipeline network's thermal efficiency, weather resistance, and safety.

[0050] The preferred embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above. Devices and structures not described in detail herein should be understood as being implemented in a conventional manner within the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of this utility model using the disclosed methods and techniques, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. This does not affect the essential content of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the content of the technical solution of this utility model, still fall within the protection scope of the technical solution of this utility model.

Claims

1. A 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 connecting ends for connecting with working steel pipes (8), characterized in that, The multi-layer thermal insulation layer is composed of 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) from inside to outside. ​ The soft and hard dual-material composite thermal insulation layer (4) is composed of hard thermal insulation materials (41) and soft thermal insulation materials (42) staggered in the axial direction of the elbow steel pipe body (1), the hard thermal insulation materials (41) are shrimp-shaped elbow sections made of calcium silicate tiles, and the soft thermal insulation materials (42) are aluminum silicate, glass wool or nano aerogel felt filled between adjacent hard thermal insulation materials (41).

2. A preformed overhead steam insulated elbow as defined in claim 1, wherein, The outer thermal insulation layer (5) is polyurethane foam.

3. A preformed overhead steam insulated elbow as defined in claim 1, wherein, 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 preformed overhead steam insulated elbow as defined in claim 1, wherein, The connecting end is connected with the working steel pipe (8) through welding.

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