Module assembly type prefabricated heat preservation elbow and installation method

Abstract

The invention discloses a module assembly type prefabricated heat preservation elbow and an installation method. Wherein a heat preservation module splicing layer, a sealing heat preservation layer and an outer protection pipe are sequentially and coaxially laid outside the working pipe elbow. The heat preservation module splicing layer comprises a hard heat preservation inner convex module, a hard heat preservation inner concave module, a splicing structure, a soft heat preservation buffer layer and a soft staggered joint heat preservation layer. The hard heat preservation inner convex module and the hard heat preservation inner concave module are embedded and spliced in the radial direction of the working pipe elbow, and soft heat preservation buffer layers are laid on the inner surfaces of the two modules and the splicing faces of the splicing structure. When the pipe diameter of the working pipe elbow is larger than DN300, the periphery of the axial splicing position of the splicing structure is filled with a soft staggered joint heat preservation layer. The heat preservation structure is tightly attached to the working pipe elbow through elastic deformation of the soft heat preservation buffer layer, the heat dissipation loss of the working pipe elbow can be effectively reduced, the elbow heat preservation construction efficiency is improved through the prefabrication technology, and the heat preservation stability of the working pipe elbow is enhanced.

Description

Technical Field

[0001] This invention relates to the field of steam insulation pipeline technology, specifically to a modular prefabricated insulated elbow and its installation method. Background Technology

[0002] With the rapid development of the steam heating industry, prefabricated steam insulated pipelines have become a popular construction method for thermal steam pipelines in recent years. They offer advantages such as good insulation performance, strong structural stability, and high construction efficiency, making their application prospects very broad. Currently, the manufacturing process for straight pipe sections in prefabricated steam insulated pipelines is relatively mature, but elbow insulation still commonly uses rigid insulation fragments spliced ​​together. There is no stable and effective prefabricated insulated elbow production process, resulting in poor insulation performance and stability for pipe elbows.

[0003] Chinese Patent 202421752665.3 discloses a prefabricated overhead steam insulation elbow, employing a main insulation structure of axially staggered rigid and flexible insulation materials. However, the thermal conductivity of the rigid and flexible insulation materials differs significantly and is independent of each other. In practical applications, the insulation effect is uneven, and there are many large splicing gaps, leading to increased heat loss. With the thermal expansion and contraction of the pipe elbow, the stability of the insulation structure further decreases, and the insulation effect continues to deteriorate. Chinese Patent 202321014300.6 discloses an insulation structure for a large-amplitude elbow in a steam insulation pipe, using traditional insulation materials polyurethane and polyethylene as the insulation structure. In actual operation, it is prone to cracking and deformation due to the thermal expansion and contraction of the elbow, increasing heat loss. Furthermore, the semi-circular insulation shell used in this design is a spliced ​​structure without external protective pipe, making it prone to loosening and disintegration upon external impact.

[0004] In conclusion, developing a stable and efficient prefabricated insulated elbow structure is crucial for improving the overall insulation performance of steam pipelines. Summary of the Invention

[0005] This invention provides a modular prefabricated insulated elbow, which aims to eliminate the local stress on the rigid insulation layer caused by the thermal expansion and contraction of the elbow through the elastic deformation of the soft insulation material, avoid the rigid insulation layer from breaking, minimize the number of circumferential insulation modules, improve the sealing and integrity of the insulation structure, and reduce heat loss.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a modular prefabricated insulated elbow for insulating a working pipe elbow. It includes an insulation module assembly layer, a sealing insulation layer, an outer protective pipe, and a support frame. The insulation module assembly layer, the sealing insulation layer, and the outer protective pipe are coaxially laid around the outside of the working pipe elbow. The insulation module assembly layer adopts a modular design, consisting of rigid convex and concave insulation modules with semi-circular cross-sections, which are spliced ​​around the working pipe elbow to form a complete insulation module covering the working pipe elbow. The rigid convex and concave insulation modules are machined into stepped tongue-and-groove joints at their jointing points, achieving tongue-and-groove splicing through the interlocking of these structures. A soft insulation buffer layer is sandwiched between the jointing surfaces of the two modules and between the two modules and the working pipe elbow, providing radial elastic deformation space. The support frame is fixed to the working pipe elbow and is used to support and fix the insulation module assembly layer based on the working pipe elbow.

[0007] As a preferred embodiment of the first aspect above, and as a first structural form, the diameter of the working pipe elbow is less than or equal to DN300, and both the rigid insulation convex module and the rigid insulation concave module are integral modules that cannot be further separated, with the bending angle of the central axis of each of the two modules remaining consistent with the bending angle of the central axis of the working pipe elbow.

[0008] As a preferred embodiment of the first aspect, and as a second structural form, the diameter of the working pipe elbow is greater than DN300 and less than or equal to DN600. The rigid insulation convex module and the rigid insulation concave module are each further decomposed into a pair of sub-modules with equal central axis bending angles. Each pair of sub-modules is spliced ​​along the axial direction of the working pipe elbow, and the bending angle of the central axis of the spliced ​​combined module is kept consistent with the bending angle of the central axis of the working pipe elbow. The axial splicing positions of the two sub-modules are both radially provided with grooves facing outwards. A soft insulation buffer layer is also sandwiched between the axial splicing surfaces of the two sub-modules. The grooves are filled with a soft staggered insulation layer, which surrounds the axial splicing surfaces of the two sub-modules to reduce heat loss at the axial splicing positions.

[0009] As a preferred embodiment of the first aspect, and as a third structural form, the diameter of the working pipe elbow is greater than DN600. The rigid insulation convex module and the rigid insulation concave module are each further decomposed into a group of sub-modules with equal central axis bending angles. Each group of sub-modules includes three sub-modules sequentially spliced ​​along the axial direction of the working pipe elbow. The bending angle of the central axis of the spliced ​​combined module is kept consistent with the bending angle of the central axis of the working pipe elbow. The axial splicing positions of the three sub-modules are all radially provided with grooves facing outward. A soft insulation buffer layer is also sandwiched between the axial splicing surfaces of the three sub-modules. The grooves are filled with a soft staggered insulation layer, which surrounds the axial splicing surfaces of two adjacent sub-modules to reduce heat loss at the axial splicing positions.

[0010] As a preferred embodiment of the first aspect, the rigid thermal insulation convex module and the rigid thermal insulation concave module are respectively machined with tongue and groove structures at their two ends along the axial direction to fit into the insulation layer of other working pipe sections.

[0011] As a preferred embodiment of the first aspect above, the bending angle of the central axis of the working pipe elbow is 90°.

[0012] As a preferred embodiment of the first aspect above, the rigid thermal insulation convex module and the rigid thermal insulation concave module are made of foamed calcium silicate or microporous calcium silicate.

[0013] As a preferred embodiment of the first aspect, the soft thermal insulation buffer layer is made of one of glass fiber felt, aluminum silicate felt, or nano aerogel felt, and has a thickness of 5mm to 15mm.

[0014] As a preferred embodiment of the first aspect above, the material of the soft staggered joint insulation layer is aluminum silicate or glass wool.

[0015] As a preferred embodiment of the first aspect above, the sealing and insulation layer is made of rubber or polyurethane and has a thickness of 20mm to 40mm.

[0016] As a preferred embodiment of the first aspect mentioned above, the outer protective tube is made of color steel plate or aluminum alloy plate.

[0017] As a preferred embodiment of the first aspect, the working pipe elbow is provided with a support frame, which is fixed in a circumferential manner at the end of the insulation module assembly layer along the pipe axis, and is used to support and fix the insulation module assembly layer based on the working pipe elbow.

[0018] As a preferred embodiment of the first aspect, the support frame is fixed around the working pipe elbow and integrally connects the end ends of the rigid insulation inner convex module and the rigid insulation inner concave module along the pipe axis, thereby using the working pipe elbow as a base to support and fix the insulation module assembly layer.

[0019] Secondly, the present invention provides an installation method for a modular prefabricated insulated elbow, the specific steps of which are as follows: First, secure the working pipe elbow and ensure that its surface is clean and free of defects; Then, based on the pipe diameter specifications of the currently fixed working pipe elbow, select the corresponding assembly type of the insulation module assembly layer and assemble it; wherein: If the pipe diameter of the working pipe elbow is less than or equal to DN300, then according to the first structural form of the first aspect above, the corresponding rigid insulation inner convex module and rigid insulation inner concave module are selected and spliced ​​together to form the insulation module assembly layer sleeved on the outside of the working pipe elbow. During the splicing process, soft insulation buffer layers need to be attached between the splicing surfaces of the two modules and between the two modules and the working pipe elbow. If the diameter of the working pipe elbow is greater than DN300 and less than or equal to DN600, then according to the second structural form of the first aspect above, the corresponding rigid insulation inner convex module and rigid insulation inner concave module are selected, and the four sub-modules of the two modules are spliced ​​along the axial and circumferential directions of the working pipe elbow to form the insulation module assembly layer sleeved on the outside of the working pipe elbow. During the splicing process, soft insulation buffer layers need to be attached between the splicing surfaces of the two modules and between the two modules and the working pipe elbow, and soft staggered insulation layers need to be filled in the groove. If the diameter of the working pipe elbow is greater than DN600, then according to the third structural form of the first aspect above, the corresponding rigid insulation inner convex module and rigid insulation inner concave module are selected, and the six sub-modules of the two modules are spliced ​​along the axial and circumferential directions of the working pipe elbow to form the insulation module assembly layer sleeved on the outside of the working pipe elbow. During the splicing process, soft insulation buffer layers need to be attached between the splicing surfaces of the two modules and between the two modules and the working pipe elbow, and soft staggered insulation layers need to be filled in the groove. Next, a sealing insulation layer is wrapped around the assembled insulation module assembly layer to ensure that the sealing insulation layer is tightly attached to the insulation module assembly layer; and a wrap-around support frame is installed at the end of the working pipe bend to provide overall support and fixation for each module of the insulation module assembly layer. Finally, an outer protective pipe is installed outside the sealed insulation layer to ensure overall sealing and impact resistance. After the overall appearance inspection is qualified, the installation of the modular prefabricated insulation elbow is completed, forming the finished product of the modular prefabricated insulation elbow.

[0020] Compared with the prior art, the advantages of the present invention are as follows: 1. In the thermal insulation module assembly layer of the present invention, soft thermal insulation material and hard thermal insulation material are integrated and combined in an integrated manner. The unique "radial concave-convex interlocking and axial tight splicing" structure is adopted. The elastic deformation of the soft thermal insulation material eliminates the local stress caused by thermal expansion and contraction of the elbow, avoids the breakage of the hard thermal insulation layer, minimizes the number of circumferential thermal insulation modules, and improves the sealing and integrity of the thermal insulation structure.

[0021] 2. This invention adopts a multi-composite insulation structure that combines soft and hard insulation. The insulation layers are tightly connected, which can effectively reduce heat loss of the working pipe elbow, enhance the insulation effect, and improve the insulation stability of the elbow.

[0022] 3. This invention uses a prefabrication process to prefabricate each module in the factory and transport it to the construction site for assembly, which can greatly improve the on-site installation efficiency of pipe elbows and reduce the overall construction cost. Attached Figure Description

[0023] Figure 1 This is a longitudinal section view of a modular prefabricated insulated elbow (the working pipe elbow diameter is less than or equal to DN300). Figure 2 This is a connection structure diagram of a modular prefabricated insulated elbow (the working pipe elbow diameter is less than or equal to DN300). Figure 3 This is a structural diagram of the assembled layer of the insulation module (the working pipe elbow diameter is less than or equal to DN300). Figure 4 This is a longitudinal section view of a modular prefabricated insulated elbow (the working pipe elbow diameter is greater than DN300 and less than or equal to DN600). Figure 5 This is a connection structure diagram of a modular prefabricated insulated elbow (the working pipe elbow diameter is greater than DN300 and less than or equal to DN600). Figure 6 This is a structural diagram of the thermal insulation module assembly layer (the working pipe elbow diameter is greater than DN300 and less than or equal to DN600). Figure 7 This is a longitudinal section view of a modular prefabricated insulated elbow (the working pipe elbow diameter is greater than DN600). Figure 8 This is a connection structure diagram of a modular prefabricated insulated elbow (the working pipe elbow diameter is greater than DN600). Figure 9 This is a structural diagram of the assembled layer of the insulation module (the working pipe elbow diameter is greater than DN600).

[0024] The reference numerals in the diagram are as follows: 1. Working pipe elbow; 2. Insulation module assembly layer; 3. Sealing insulation layer; 4. Outer protective pipe; 5. Support frame; 6. Rigid insulation inner convex module; 7. Rigid insulation inner concave module; 8. Splicing structure; 9. Soft insulation buffer layer; 10. Soft staggered joint insulation layer; 61. First splicing inner convex sub-module; 62. Second splicing inner convex sub-module; 63. Third splicing inner convex sub-module; 64. Fourth splicing inner convex sub-module; 65. First splicing inner concave sub-module; 71. Second splicing inner concave sub-module; 72. Third splicing inner concave sub-module; 73. Fourth splicing inner concave sub-module; 74. Fifth splicing inner concave sub-module; 75. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] This invention provides a modular prefabricated insulated elbow, used for insulating working pipe elbows. The modular prefabricated insulated elbow comprises an insulation module assembly layer, a sealing insulation layer, an outer protective pipe, and a support frame. The insulation module assembly layer has three different structural forms, each adaptable to working pipe elbows of different diameters. All three structural forms of the insulation module assembly layer utilize the elastic deformation of soft insulation material to eliminate localized stress on the rigid insulation layer caused by thermal expansion and contraction of the elbow, preventing breakage of the rigid insulation layer, minimizing the number of circumferential insulation modules, improving the sealing and integrity of the insulation structure, and reducing heat loss. The following three different embodiments demonstrate three types of modular prefabricated insulated elbows with different structural forms of the insulation module assembly layer.

[0027] like Figure 1 , Figure 2 and Figure 3As shown, in a preferred embodiment of the present invention, a modular prefabricated insulated elbow with a first structural form is provided, which includes an insulation module assembly layer 2, a sealing insulation layer 3, an outer protective pipe 4, and a support frame 5. The insulation module assembly layer 2, the sealing insulation layer 3, and the outer protective pipe 4 are sequentially and coaxially laid outside the working pipe elbow 1. The insulation module assembly layer 2 adopts a modular design, consisting of rigid insulation convex modules 6 and rigid insulation concave modules 7, both with semi-circular cross-sections, spliced ​​around the working pipe elbow 1 to form a complete insulation module covering the working pipe elbow 1. Furthermore, the rigid insulation convex modules 6 and rigid insulation concave modules 7 are all machined into stepped tongue-and-groove splicing structures 8 at their joint positions, achieving tongue-and-groove splicing through the interlocking of the splicing structures 8. Furthermore, to maintain structural stability, the splicing structure 8 on the rigid insulation convex module 6 is preferably designed as a concave stepped surface, while the splicing structure 8 on the rigid insulation convex module 6 is preferably designed as a convex stepped surface. The two splicing structures 8 can be joined together by mortise and tenon joints through the stepped surfaces. The two stepped planes at the fitting position are the splicing surfaces. A soft insulation buffer layer 9 is sandwiched between the splicing surfaces of the rigid insulation convex module 6 and the rigid insulation concave module 7. At the same time, a soft insulation buffer layer 9 is also sandwiched between these two modules and the working pipe elbow 1, providing radial elastic deformation space. Through the elastic deformation of the soft insulation buffer layer 9, deformation and cracking of the rigid insulation convex module 6 and the rigid insulation concave module 7 due to thermal expansion and contraction can be avoided, minimizing the number of circumferential insulation modules and improving the sealing and integrity of the insulation structure.

[0028] This modular prefabricated insulated elbow structure is suitable for pipe diameters of DN300 or less in the working pipe elbow 1. Its biggest difference from the other two structures lies in the fact that the two modules forming the insulation module assembly layer 2—the rigid insulation convex module 6 and the rigid insulation concave module 7—are each an integral, non-separable module. The bending angle of the central axis of each module remains consistent with the bending angle of the central axis of the working pipe elbow 1. Assuming the bending angle of the central axis of the working pipe elbow 1 is N°, then the bending angles of the central axes of the rigid insulation convex module 6 and the rigid insulation concave module 7 are also both N°.

[0029] It should be noted that the central axis of the working pipe elbow 1 is an arc, and the "central axis bending angle" of the working pipe elbow 1 refers to the central angle corresponding to the arc length of the central axis of the working pipe elbow 1. The same applies to the central axis bending angles of the rigid insulation convex module 6 and the rigid insulation concave module 7. In the embodiment of the present invention, the central axis bending angle of the working pipe elbow 1 is N° = 90°, that is, the working pipe elbow 1 is a right-angle elbow. Of course, theoretically, the present invention is also applicable to other non-right-angle elbows where N° is not equal to 90°.

[0030] Furthermore, since the insulation module assembly layer 2 adopts a modular design consisting of a rigid insulation convex module 6 and a rigid insulation concave module 7, an additional support frame 5 needs to be fixed to its end on the working pipe elbow 1. This allows the working pipe elbow 1 to serve as a base for supporting and fixing the insulation module assembly layer 2. In this embodiment, the support frame 5 uses an annular hoop with multiple connectors evenly distributed around it. The hoop is fixed to the working pipe elbow 1 in a circular manner, while some connectors are fixed to the end of the rigid insulation convex module 6 along the pipe axial direction, and the remaining connectors are fixed to the end of the rigid insulation concave module 7 along the pipe axial direction. This integrates the end of the rigid insulation convex module 6 and the rigid insulation concave module 7 along the pipe axial direction, thus supporting and fixing the insulation module assembly layer 2 based on the working pipe elbow 1, preventing the two modules from detaching from each other or sliding along the pipe axial direction. In embodiments of the present invention, the connector is a connecting plate with ribs on the back. The connecting plate can fit the end planes of the rigid thermal insulation convex module 6 and the rigid thermal insulation concave module 7, and the two are connected by screws, bolts or other connection methods.

[0031] It should be noted that the aforementioned support frame 5 can be installed only on one end of the two modules along the pipe axis, or it can be installed on both ends of the two modules along the pipe axis. The specific choice can be made according to the actual situation.

[0032] Furthermore, in the embodiments of the present invention, since the two ends of the working pipe elbow 1 need to be connected to other working pipe sections during actual use, and these working pipe sections also need to be equipped with pipe insulation layers, in order to facilitate the docking and fitting of the insulation module assembly layer 2 on the working pipe elbow 1 with the pipe insulation layers of other other working pipe sections, the rigid insulation convex module 6 and the rigid insulation concave module 7 need to be machined with tongue and groove structures at their two ends along the axial direction. The pipe insulation layers of other working pipe sections also need to be machined with matching tongue and groove structures at their ends, and the ends of the rigid insulation convex module 6 and the rigid insulation concave module 7 are docked and fitted with the pipe insulation layers of other working pipe sections through the tongue and groove structures. It should be noted that the tongue and groove structures at the two ends along the axial direction of the rigid insulation convex module 6 and the rigid insulation concave module 7 are actually splicing structures 8, and a stepped surface form is recommended.

[0033] In addition, the exterior of the aforementioned insulation module assembly layer 2 must be completely covered by the sealing insulation layer 3 and the outer protective pipe 4 in sequence, and the bending angle of their central axes should be consistent with the bending angle of the central axis of the working pipe elbow 1. If the bending angle of the central axis of the working pipe elbow 1 is N°=90°, then the bending angle of the central axes of the sealing insulation layer 3 and the outer protective pipe 4 should also be N°=90°.

[0034] like Figure 4 , Figure 5 and Figure 6 As shown, in another preferred embodiment of the present invention, a second type of modular prefabricated insulated elbow is provided, which also includes an insulated module assembly layer 2, a sealing insulation layer 3, an outer protective pipe 4, and a support frame 5. The insulated module assembly layer 2, the sealing insulation layer 3, and the outer protective pipe 4 are sequentially and coaxially laid outside the working pipe elbow 1. Similar to the first type of structure, the insulated module assembly layer 2 in the second type of structure also adopts a modular design, consisting of rigid insulated convex modules 6 and rigid insulated concave modules 7, both with semi-circular cross-sections, spliced ​​around the working pipe elbow 1 to form a complete insulated module covering the working pipe elbow 1. The specific structure and assembly method of the sealing insulation layer 3, the outer protective pipe 4, and the support frame 5 are also the same as in the first type of structure. However, in the second type of structure, the rigid insulated convex modules 6 and rigid insulated concave modules 7 in the insulated module assembly layer 2 are not integrated modules, but are each further decomposed into a pair of sub-modules with equal bending angles along their central axes. Each pair of sub-modules is axially spliced ​​along the working pipe elbow 1, and the bending angle of the central axis of the spliced ​​combined module is kept consistent with the bending angle of the central axis of the working pipe elbow 1. Furthermore, the axial splicing positions of the two sub-modules are radially grooved towards the outer surface, and a soft thermal insulation buffer layer 9 is sandwiched between the axial splicing surfaces of the two sub-modules. A soft staggered thermal insulation layer 10 is filled in the grooves, and the soft staggered thermal insulation layer 10 surrounds the axial splicing surfaces of the two sub-modules to reduce heat loss at the axial splicing positions.

[0035] The rigid thermal insulation convex module 6 is formed by splicing a first splicing convex sub-module 61 and a second splicing convex sub-module 62 along the axial direction of the working pipe elbow 1. The bending angle of the central axis of the working pipe elbow 1 is N°, so the bending angles of the central axes of the first splicing convex sub-module 61 and the second splicing convex sub-module 62 are N / 2° respectively, and the bending angle of the central axis of the combined module after splicing is N°. Both the first splicing convex sub-module 61 and the second splicing convex sub-module 62 have radially opened grooves facing outwards at their axial splicing positions. The two sub-modules are joined by the flat side of the un-penetrated portion below the groove; this flat side is the axial splicing surface of the two sub-modules. A soft thermal insulation buffer layer 9 is also sandwiched between the axial splicing surfaces of the first splicing convex sub-module 61 and the second splicing convex sub-module 62. Furthermore, after the first splicing inner convex sub-module 61 and the second splicing inner convex sub-module 62 are joined together, they form a complete groove. This groove is symmetrical about the center of the splicing seam between the two sub-modules. The groove is filled with soft insulation material to form a soft staggered joint insulation layer 10. This soft staggered joint insulation layer 10 surrounds the axial splicing surface of the two sub-modules, which can reduce heat loss at the axial splicing position.

[0036] Similarly, the rigid thermal insulation recessed module 7 is formed by splicing a first splicing recessed sub-module 71 and a second splicing recessed sub-module 72 along the axial direction of the working pipe elbow 1. The bending angle of the central axis of the working pipe elbow 1 is N°, so the bending angles of the central axes of the first splicing recessed sub-module 71 and the second splicing recessed sub-module 72 are N / 2° respectively, and the bending angle of the central axis of the combined module after splicing is N°. The axial splicing positions of the first splicing recessed sub-module 71 and the second splicing recessed sub-module 72 are both radially provided with grooves opening towards the outer surface. The two sub-modules are joined by the flat side of the un-penetrated part below the groove, and the flat side of the joint is the axial splicing surface of the two sub-modules. A soft thermal insulation buffer layer 9 is also sandwiched between the axial splicing surfaces of the first splicing recessed sub-module 71 and the second splicing recessed sub-module 72. Furthermore, the first concave sub-module 71 and the second concave sub-module 72, when joined together, form a complete groove. This groove is symmetrical about the center of the joint between the two sub-modules, and is filled with soft insulation material to form a soft staggered joint insulation layer 10. This soft staggered joint insulation layer 10 surrounds the axial joint surface of the two sub-modules, which can reduce heat loss at the axial joint position.

[0037] The second type of modular prefabricated insulated elbow and the insulated module assembly layer 2 described above are suitable for working pipe elbows 1 with a pipe diameter greater than DN300 and less than or equal to DN600. For such large pipe diameters, the first splicing inner convex sub-module 61 and the second splicing inner convex sub-module 62 are further decomposed into sub-modules along the axial direction for assembly. Then, a soft staggered joint insulation layer 10 is filled around the axial splicing joint of the splicing structure. This facilitates prefabrication and installation, effectively reduces heat loss from the working pipe elbow, and enhances the insulation stability of the working pipe elbow.

[0038] like Figure 7 , Figure 8 and Figure 9As shown, in another preferred embodiment of the present invention, a third type of modular prefabricated insulated elbow is provided, which also includes an insulation module assembly layer 2, a sealing insulation layer 3, an outer protective pipe 4, and a support frame 5. The insulation module assembly layer 2, the sealing insulation layer 3, and the outer protective pipe 4 are sequentially and coaxially laid outside the working pipe elbow 1. The specific structure and assembly method of the sealing insulation layer 3, the outer protective pipe 4, and the support frame 5 are the same as those of the first and second types of structures. Furthermore, referring to the second structural form, the third structural form of the insulation module assembly layer 2 also adopts a modular design. It consists of rigid insulation convex modules 6 and rigid insulation concave modules 7, both with semi-circular cross-sections, spliced ​​around the working pipe elbow 1 to form a complete insulation module covering the working pipe elbow 1. The rigid insulation convex modules 6 and rigid insulation concave modules 7 in the insulation module assembly layer 2 are each further decomposed into a group of sub-modules with equal central axis bending angles. Each group of sub-modules contains three sub-modules sequentially spliced ​​along the axial direction of the working pipe elbow 1. The bending angle of the central axis of the assembled module remains consistent with that of the working pipe elbow 1. Moreover, each of the three sub-modules has radially formed grooves facing outwards at its axial splicing position. A soft insulation buffer layer 9 is also sandwiched between the axial splicing surfaces of the three sub-modules. The grooves are filled with a soft staggered insulation layer 10, which surrounds the axial splicing surfaces of two adjacent sub-modules to reduce heat loss at the axial splicing positions.

[0039] Therefore, compared to the second type of insulation module assembly layer 2, the difference in the third type of insulation module assembly layer 2 lies only in that the number of sub-modules decomposed from the rigid insulation convex module 6 and the rigid insulation concave module 7 is further increased from 2 to 3, and the number of grooves opened in each module is also increased accordingly. Specifically, the rigid insulation convex module 6 is formed by sequentially splicing the third splicing convex sub-module 63, the fourth splicing convex sub-module 64, and the fifth splicing convex sub-module 65 along the axial direction of the working pipe bend 1. After the three sub-modules are combined, they will form two complete grooves, each symmetrical about its splice seam, and the grooves are filled with a soft staggered insulation layer 10. Similarly, the rigid insulation concave module 7 is formed by sequentially splicing the third splicing concave sub-module 73, the fourth splicing concave sub-module 74, and the fifth splicing concave sub-module 75 along the axial direction of the working pipe elbow 1. After the three sub-modules are combined, they will form two complete grooves, each symmetrical about its own splice seam. The grooves are filled with a soft staggered insulation layer 10. If the bending angle of the central axis of the working pipe elbow 1 is N°, then the bending angles of the central axes of the third splicing convex sub-module 63, the fourth splicing convex sub-module 64, the fifth splicing convex sub-module 65, the third splicing concave sub-module 73, the fourth splicing concave sub-module 74, and the fifth splicing concave sub-module 75 are N / 3° respectively.

[0040] The third type of modular prefabricated insulated elbow and the insulation module assembly layer 2 described above are suitable for cases where the pipe diameter of the working pipe elbow 1 is greater than DN600. For cases with even larger pipe diameters, the first splicing inner convex sub-module 61 and the second splicing inner convex sub-module 62 are further decomposed into more sub-modules along the axial direction for assembly. Then, a soft staggered joint insulation layer 10 is filled around the axial splicing joint of the splicing structure. This facilitates prefabrication and installation, effectively reduces heat loss from the working pipe elbow, and enhances the insulation stability of the working pipe elbow.

[0041] Therefore, the above three structural forms of modular prefabricated insulated elbows and insulated module assembly layers 2 are suitable for working pipe elbows 1 with different pipe diameters. In practical applications, the corresponding structural form of the insulated module assembly layer 2 can be selected according to the actual pipe diameter of the working pipe elbow 1. The modules in the selected insulated module assembly layer 2 are then fitted and spliced ​​along the circumference of the working pipe elbow 1 or along the axial direction of the working pipe elbow 1, ensuring that the soft insulation buffer layer 9 is tightly fitted to the working pipe elbow 1. Moreover, when the pipe diameter of the working pipe elbow 1 is greater than DN300, it is also necessary to fill the groove around the axial splicing of the splicing structure 8 with soft insulation material. After filling, it is compacted and leveled to form an annular soft staggered joint insulation layer 10 with an outer wall flush with the outer wall of the insulated module assembly layer 2.

[0042] In addition, it should be noted that the materials and structural parameters of the above-mentioned structural unit modules can be reasonably optimized according to actual needs.

[0043] In the embodiments of the present invention, the optional materials of the above-mentioned rigid thermal insulation convex module 6 and rigid thermal insulation concave module 7 include foamed calcium silicate and microporous calcium silicate, which serve to provide the main thermal insulation effect for the working pipe elbow 1 and improve the thermal insulation stability.

[0044] In embodiments of the present invention, the optional material of the soft thermal insulation buffer layer 9 includes one of glass fiber felt, aluminum silicate felt, and nano aerogel felt, with a thickness of 5mm to 15mm. Its function is to ensure that the working pipe elbow 1 is tightly fitted with the rigid thermal insulation inner convex module 6 and the rigid thermal insulation inner concave module 7, providing a certain thermal insulation effect for the working pipe elbow 1, and avoiding deformation and cracking of the rigid thermal insulation inner convex module 6 and the rigid thermal insulation inner concave module 7 due to thermal expansion and contraction through elastic deformation, thereby minimizing the number of circumferential thermal insulation modules and improving the sealing and integrity of the thermal insulation structure.

[0045] In embodiments of the present invention, the optional material of the above-mentioned soft staggered insulation layer 10 includes aluminum silicate and glass wool, which serves to reduce heat loss caused by gaps at the joints of the splicing convex and concave modules.

[0046] In the embodiments of the present invention, the optional material of the above-mentioned sealing and heat insulation layer 3 includes rubber and plastic or polyurethane, and the thickness is 20mm~40mm. Its function is to seal the working pipe elbow 1 and the heat insulation module assembly layer 2 externally, prevent convection heat transfer between the inside and outside of the heat insulation layer, and provide a certain heat insulation effect.

[0047] In embodiments of the present invention, the outer protective tube 4 may be made of one of color steel plate or aluminum alloy plate, which can protect the internal insulation layer structure.

[0048] In addition, based on the above three types of modular prefabricated insulated elbows, this invention can also provide a method for installing modular prefabricated insulated elbows for working pipe elbows, the specific steps of which are as follows: First, fix the working pipe elbow 1 and ensure that its surface is clean and free of defects; Then, based on the pipe diameter specifications of the currently fixed working pipe elbow 1, select the corresponding assembly type of the insulation module assembly layer 2 from the above three structural forms and assemble it; wherein: If the pipe diameter of the working pipe elbow 1 is less than or equal to DN300, then according to the first structural form of the above-mentioned modular prefabricated insulated elbow, select the integrated rigid insulated inner convex module 6 and rigid insulated inner concave module 7 corresponding to the first structural form, and splice the two to form an insulated module assembly layer 2 that is sleeved on the outside of the working pipe elbow 1. During the splicing process, a soft insulated buffer layer 9 needs to be attached between the splicing surfaces of the two modules and between the two modules and the working pipe elbow 1. If the pipe diameter of the working pipe elbow 1 is greater than DN300 and less than or equal to DN600, then according to the second structural form of the prefabricated insulated elbow, select the rigid insulated inner convex module 6 and rigid insulated inner concave module 7, which respectively contain two sub-modules, and splice the four sub-modules of the two modules along the axial and circumferential directions of the working pipe elbow 1 to form an insulated module assembly layer 2 that is fitted on the outside of the working pipe elbow 1. During the splicing process, soft insulated buffer layers 9 need to be attached between the splicing surfaces of the two modules, the splicing surfaces of the sub-modules inside each module, and between the two modules and the working pipe elbow 1. At the same time, soft staggered insulated layers 10 need to be filled in all the grooves. If the pipe diameter of the working pipe elbow 1 is greater than DN600, then according to the modular assembly type of the third structural form of the above-mentioned prefabricated insulated elbow, select the rigid insulated inner convex module 6 and the rigid insulated inner concave module 7, which respectively contain three sub-modules, and splice the six sub-modules of the two modules along the axial and circumferential directions of the working pipe elbow 1 to form the insulated module assembly layer 2 sleeved on the outside of the working pipe elbow 1. During the splicing process, soft insulated buffer layers 9 need to be attached between the splicing surfaces of the two modules, the splicing surfaces of the sub-modules inside each module, and between the two modules and the working pipe elbow 1. At the same time, soft staggered joint insulated layers 10 need to be filled in the groove. Next, a sealing insulation layer 3 is wrapped around the outside of the assembled insulation module assembly layer 2 to ensure that the sealing insulation layer 3 is tightly attached to the insulation module assembly layer 2; and a ring-shaped support frame 5 is installed at one or both ends of the working pipe elbow 1, so that the support frame 5 can provide overall support and fixation for each module of the insulation module assembly layer 2. Finally, an outer protective pipe 4 is installed outside the sealed insulation layer 3 to ensure overall sealing and impact resistance. After the overall appearance inspection is qualified (ensuring no insulation layer is exposed, no heat leakage at splicing seams, etc.), the installation of the modular prefabricated insulation elbow is completed, forming the finished product of the modular prefabricated insulation elbow.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A modular prefabricated insulated elbow for insulating a working pipe elbow (1), characterized in that, The insulation module assembly layer (2), the sealing insulation layer (3), the outer protective pipe (4), and the support frame (5) are included. The insulation module assembly layer (2), the sealing insulation layer (3), and the outer protective pipe (4) are laid coaxially outside the working pipe elbow (1) in sequence. The insulation module assembly layer (2) adopts a modular design, consisting of rigid insulation convex modules (6) and rigid insulation concave modules (7) with semi-circular cross-sections, which are spliced ​​around the working pipe elbow (1) to form a complete insulation module covering the working pipe elbow (1). The rigid insulation convex modules (6) and (7) are spliced ​​around the working pipe elbow (1) in a circumferential manner. 6) and the rigid insulation concave module (7) are both processed into a stepped tongue and groove splicing structure (8) at the splicing position. The tongue and groove splicing is achieved by the mutual interlocking of the splicing structure (8). A soft insulation buffer layer (9) is sandwiched between the splicing surfaces of the two modules and between the two modules and the working pipe elbow (1). The soft insulation buffer layer (9) provides radial elastic deformation space. The support frame (5) is fixed on the working pipe elbow (1) and is used to support and fix the insulation module assembly layer (2) based on the working pipe elbow (1).

2. The modular prefabricated insulated elbow as described in claim 1, characterized in that, The diameter of the working pipe elbow (1) is less than or equal to DN300. The rigid insulation convex module (6) and the rigid insulation concave module (7) are each an integral module that cannot be further separated. The bending angle of the central axis of each of the two modules is consistent with the bending angle of the central axis of the working pipe elbow (1).

3. The modular prefabricated insulated elbow as described in claim 1, characterized in that, The diameter of the working pipe elbow (1) is greater than DN300 and less than or equal to DN600. The rigid heat-insulating convex module (6) and the rigid heat-insulating concave module (7) are each further decomposed into a pair of sub-modules with equal central axis bending angles. Each pair of sub-modules is spliced ​​along the working pipe elbow (1) axially. The bending angle of the central axis of the spliced ​​combined module is kept consistent with the bending angle of the central axis of the working pipe elbow (1). The axial splicing positions of the two sub-modules are all radially provided with grooves facing the outer surface. A soft heat-insulating buffer layer (9) is also sandwiched between the axial splicing surfaces of the two sub-modules. The grooves are filled with a soft staggered heat-insulating layer (10). The soft staggered heat-insulating layer (10) surrounds the axial splicing surfaces of the two sub-modules to reduce heat loss at the axial splicing positions.

4. The modular prefabricated insulated elbow as described in claim 1, characterized in that, The diameter of the working pipe elbow (1) is greater than DN600. The rigid heat-insulating convex module (6) and the rigid heat-insulating concave module (7) are each further decomposed into a group of sub-modules with equal central axis bending angles. Each group of sub-modules contains 3 sub-modules that are sequentially spliced ​​along the axial direction of the working pipe elbow (1). The bending angle of the central axis of the spliced ​​combined module is consistent with the bending angle of the central axis of the working pipe elbow (1). The axial splicing positions of the three sub-modules are all radially provided with grooves facing the outer surface. A soft heat-insulating buffer layer (9) is also sandwiched between the axial splicing surfaces of the three sub-modules. The grooves are filled with a soft staggered heat-insulating layer (10). The soft staggered heat-insulating layer (10) surrounds the axial splicing surfaces of two adjacent sub-modules to reduce heat loss at the axial splicing positions.

5. A modular prefabricated insulated elbow as described in claim 1, characterized in that, The rigid thermal insulation convex module (6) and the rigid thermal insulation concave module (7) are respectively machined with tongue and groove structures at both ends along the axial direction to fit into the thermal insulation layer of other working pipe sections.

6. A modular prefabricated insulated elbow as described in claim 1, characterized in that, The bending angle of the central axis of the working pipe elbow (1) is 90°.

7. A modular prefabricated insulated elbow according to claim 1, characterized in that, The material parameters of each component structure satisfy one or more of the following: A) to E): A) The rigid thermal insulation convex module (6) and the rigid thermal insulation concave module (7) are made of foamed calcium silicate or microporous calcium silicate. B) The soft thermal insulation buffer layer (9) is made of one of glass fiber felt, aluminum silicate felt, or nano aerogel felt, and has a thickness of 5mm to 15mm. C) The material of the soft staggered joint insulation layer (10) is aluminum silicate or glass wool; D) The material of the sealing and insulation layer (3) is rubber or polyurethane, and the thickness is 20mm~40mm; E) The outer protective tube (4) is made of color steel plate or aluminum alloy plate.

8. A modular prefabricated insulated elbow according to claim 1, characterized in that, The support frame (5) is fixed around the working pipe elbow (1) and is integrated with the end of the rigid insulation inner convex module (6) and the rigid insulation inner concave module (7) along the pipe axis, thereby using the working pipe elbow (1) as the base to support and fix the insulation module assembly layer (2).

9. A modular prefabricated insulated elbow according to claim 1, characterized in that, The sealing insulation layer (3) and the outer protective tube (4) are sequentially and completely covered on the outside of the insulation module assembly layer (2), and the bending angle of their central axes is consistent with the bending angle of the central axis of the working pipe elbow (1).

10. An installation method for a modular prefabricated insulated elbow, characterized in that: First, fix the working pipe elbow (1) to ensure that its surface is clean and free of defects; Then, based on the pipe diameter specifications of the currently fixed working pipe elbow (1), select the corresponding assembly type of the insulation module assembly layer (2) and assemble it; wherein: If the pipe diameter of the working pipe elbow (1) is less than or equal to DN300, then according to the modular prefabricated insulated elbow as described in claim 2, select the corresponding rigid insulated convex module (6) and rigid insulated concave module (7), and splice the two to form the insulated module assembly layer (2) sleeved on the outside of the working pipe elbow (1). During the splicing process, soft insulated buffer layer (9) needs to be attached between the splicing surfaces of the two modules and between the two modules and the working pipe elbow (1). If the pipe diameter of the working pipe elbow (1) is greater than DN300 and less than or equal to DN600, then according to the modular prefabricated insulation elbow as described in claim 3, select the corresponding rigid insulation convex module (6) and rigid insulation concave module (7), and splice the four sub-modules of the two modules along the axial and circumferential directions of the working pipe elbow (1) to form the insulation module assembly layer (2) sleeved on the outside of the working pipe elbow (1). During the splicing process, soft insulation buffer layer (9) needs to be attached between the splicing surfaces of the two modules and between the two modules and the working pipe elbow (1), and soft staggered insulation layer (10) needs to be filled in the groove. If the pipe diameter of the working pipe elbow (1) is greater than DN600, then according to the modular prefabricated insulated elbow as described in claim 4, select the corresponding rigid insulated convex module (6) and rigid insulated concave module (7), and splice the six sub-modules of the two modules along the axial and circumferential directions of the working pipe elbow (1) to form the insulated module assembly layer (2) sleeved on the outside of the working pipe elbow (1). During the splicing process, soft insulated buffer layer (9) needs to be attached between the splicing surfaces of the two modules and between the two modules and the working pipe elbow (1), and soft staggered insulated layer (10) needs to be filled in the groove. Then, a sealing insulation layer (3) is wrapped around the assembled insulation module assembly layer (2) to ensure that the sealing insulation layer (3) is tightly attached to the insulation module assembly layer (2); and a ring-shaped support frame (5) is installed at the end of the working pipe elbow (1) to support and fix each module of the insulation module assembly layer (2) as a whole. Finally, an outer protective tube (4) is installed on the outside of the sealing insulation layer (3) to ensure overall sealing and impact resistance. After the overall appearance inspection is qualified, the installation of the modular prefabricated insulation elbow is completed, forming the finished product of the modular prefabricated insulation elbow.

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