Pipeline cold insulation structure and cold box

Abstract

This utility model discloses a pipe insulation structure and a cold box. The pipe insulation structure includes: a wall panel extending along a first direction and having a through hole, the through hole penetrating the wall panel along a second direction; the wall panel having a first wall along the second direction; a pipe extending along the second direction and having a first end passing through the through hole and located on one side of the first wall; the pipe and the through hole are spaced apart; an expansion joint fitted onto the pipe, located between the first wall and the first end, one end of the expansion joint being fixedly connected to the first wall, and a gap being provided between the expansion joint and the pipe; and an annular plate fitted onto the pipe, the annular plate having an inner side wall and an outer side wall, the inner side wall being fixedly connected to the outer periphery of the pipe, and the outer side wall being fixedly connected to the inner surface of the expansion joint; wherein the first direction and the second direction are perpendicular to each other. This utility model can block the conduction of cold energy to the wall panel, thereby preventing cold brittleness and reducing energy consumption, while also compensating for the deformation of the pipe caused by cold contraction.

Description

Technical Field

[0001] This utility model relates to the technical field of pipeline insulation, and in particular to a pipeline insulation structure and a cold box. Background Technology

[0002] A cold box is a set of highly efficient, thermally insulated cryogenic heat exchange equipment widely used in cryogenic separation processes. The cold box contains numerous cryogenic pipes. In addition to the conventional perlite insulation inside the cold box, the extended portions of the pipes that penetrate the cold box walls also require effective insulation. During operation, insufficient insulation of the cryogenic pipes exposed to the atmosphere will lead to heat loss, causing frost formation on the outer pipes, increasing energy consumption, and potentially transferring heat to the walls, resulting in brittleness of the steel structure and posing safety hazards.

[0003] Traditionally, pipes are welded directly to the cold box wall panels and insulated with polyurethane foam. This method allows cold energy to be directly transferred to the wall panels, necessitating additional low-temperature resistance design for the cold box structure. Furthermore, the rigid pipe connections limit the necessary thermal compensation flexibility of the piping. Another common solution is to use flexible rubber sleeves for through-wall insulation. However, rubber materials are prone to aging and deformation when exposed to the atmosphere for extended periods, requiring regular replacement. Additionally, achieving a tight connection between the rubber sleeves and the pipes and wall panels is difficult, affecting the overall sealing performance of the cold box.

[0004] Therefore, there is an urgent need for a pipe insulation structure and cold box that can both prevent cold energy from being directly transferred to the wall panel and compensate for pipe shrinkage. Utility Model Content

[0005] The purpose of this invention is to solve the problems of cold brittleness and energy consumption caused by cold energy being conducted to the wall panel through the pipe in the prior art, as well as the problem of not being able to compensate for the cold contraction and deformation of the pipe.

[0006] To solve the above-mentioned technical problems, this utility model discloses a pipe insulation structure, comprising:

[0007] A wall panel extending along a first direction has a through hole, the through hole penetrating the wall panel along a second direction; along the second direction, the wall panel has a first wall;

[0008] A pipe extending in the second direction has a first end that passes through the through hole and is located on one side of the first wall; the pipe is spaced apart from the through hole.

[0009] An expansion joint is fitted onto the pipe and located between the first wall and the first end. One end of the expansion joint is fixedly connected to the first wall, and a gap is provided between the expansion joint and the pipe.

[0010] A ring plate is fitted onto the pipe. The ring plate has an inner side wall and an outer side wall. The inner side wall is fixedly connected to the outer periphery of the pipe, and the outer side wall is fixedly connected to the inner surface of the expansion joint.

[0011] Wherein, the first direction and the second direction are perpendicular to each other.

[0012] By employing the above technical solution, an expansion joint is installed outside the pipeline. One end of the expansion joint is fixedly connected to the pipeline via a ring plate, and the other end is fixedly connected to the wall plate. Based on this connection method, by pre-setting the tension or compression amount (i.e., pre-tightening amount) of the expansion joint, it can effectively absorb the cold contraction deformation of the pipeline, allowing the expansion joint to undergo corresponding elastic deformation during pipeline cold contraction, thereby achieving displacement compensation. By spacing the pipeline from the through-hole, meaning the pipeline does not directly contact the wall plate, it prevents cold energy from being conducted to the wall plate, eliminating the risk of wall plate embrittlement and energy loss. Simultaneously, a gap is provided between the pipeline and the expansion joint to prevent cold energy from being conducted to the expansion joint, further preventing energy loss.

[0013] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a pipe insulation structure, wherein heat insulation material is provided in the gap between the expansion joint and the pipe.

[0014] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a pipe insulation structure, wherein the insulation material is rock wool.

[0015] By employing the above technical solution, insulation material, such as rock wool, is filled between the pipe and the expansion joint. This further prevents cold air loss and enhances the overall insulation effect of the structure. Simultaneously, it effectively blocks direct contact between the pipe and the wall panel, preventing cold air from being conducted to the wall panel.

[0016] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a pipe insulation structure, wherein the expansion joint is made of metal material.

[0017] Using the above technical solution, the expansion joint is made of corrosion-resistant metal. The corrosion resistance of the metal material effectively resists atmospheric and environmental erosion, thereby ensuring the service life of the expansion joint.

[0018] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a pipe insulation structure, which further includes:

[0019] A first reinforcing ring, along the second direction, is disposed between the ring plate and the expansion joint, and has a first inner wall and a first outer wall. The first inner wall is fixedly connected to the outer wall, and the first outer wall is fixedly connected to the inner surface of the expansion joint.

[0020] The thickness of the first reinforcing ring is greater than the thickness of the expansion joint.

[0021] Expansion joints, designed for elastic deformation, typically have thin walls. When directly connected to the ring plate, the connection is weak and prone to tearing during expansion joint contraction. The aforementioned technical solution addresses this by adding a first reinforcing ring with a thickness greater than that of the expansion joint. The increased thickness of the first reinforcing ring enhances the rigidity of the connection when it connects to the ring plate. Furthermore, the connection strength can be further increased by adjusting the contact area between the first outer wall and the inner surface of the expansion joint when its first outer wall connects to the inner surface.

[0022] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a pipe insulation structure, which further includes:

[0023] The second reinforcing ring, along the second direction, is disposed between the wall panel and the expansion joint, has a second outer wall, one end of which is fixedly connected to the wall panel, and the second outer wall is fixedly connected to the inner surface of the expansion joint;

[0024] The thickness of the second reinforcing ring is greater than the thickness of the expansion joint.

[0025] By employing the above technical solution, a second reinforcing ring with a thickness greater than that of the expansion joint is added. Due to the increased thickness, the connection strength is increased when the end of the second reinforcing ring is connected to the wall panel, preventing breakage at the connection point during expansion joint contraction. Furthermore, the connection strength can be further increased by adjusting the connection area between the second outer wall and the inner surface of the expansion joint when the second outer wall is connected to the inner surface.

[0026] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a pipe insulation structure, which further includes:

[0027] The positioning ring assembly includes a short section and a reinforcing plate, wherein the short section extends along a second direction, the reinforcing plate extends along a first direction, and the reinforcing plate is disposed on the outer periphery of the short section;

[0028] Along the second direction, the wall panel has a second wall;

[0029] The outer surface of the short section abuts against the wall of the through hole, and the pipe is spaced apart from the short section; the reinforcing plate is fixedly connected to the second wall;

[0030] The height of the short section is greater than the thickness of the wall panel.

[0031] Using the above technical solution, due to the thinness of the wall panel, a positioning ring assembly is used to provide support and prevent deformation. Specifically, the positioning ring assembly abuts against the wall of the through hole via a short section, and the height of the short section is greater than the thickness of the wall panel, ensuring that the short section can fully penetrate the wall panel and provide support for the through hole, enhancing the rigidity around the through hole and preventing deformation. It also prevents direct contact between the pipe and the wall panel due to vibration. A reinforcing plate is fixedly connected to the second wall of the wall panel, thereby securing the positioning ring assembly and preventing it from shifting. The spacing between the pipe and the short section effectively reduces heat transfer and improves the structural strength of the wall panel.

[0032] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a pipe insulation structure, wherein the positioning ring assembly includes a first part and a second part, the first part having a first short section and a first reinforcing plate; the second part having a second short section and a second reinforcing plate;

[0033] The first short section and the second short section are combined to form the short section; the first reinforcing plate and the second reinforcing plate are combined to form the reinforcing plate.

[0034] By adopting the above technical solution, the positioning ring assembly is designed as a first part and a second part that can be assembled. The split structure allows the first part and the second part to be joined and fixed from both sides after the pipe is in place, which overcomes the limitation of the integral ring component that requires the pipe to be inserted, thereby improving the installation efficiency and convenience.

[0035] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a pipe insulation structure, which further includes:

[0036] A flange is fixedly connected to the first end of the pipe.

[0037] Using the above technical solution, a flange is installed at one end of the pipeline for connecting other pipelines or equipment within the system.

[0038] This utility model also discloses a cold box, comprising:

[0039] The pipe insulation structure as described in any of the above embodiments;

[0040] The outer shell, the wall panel in the pipe insulation structure is fixedly connected to the outer shell. Attached Figure Description

[0041] Figure 1 This diagram shows a perspective view of the pipe insulation structure according to an embodiment of the present invention.

[0042] Figure 2 An exploded view of the pipe insulation structure according to an embodiment of this utility model is shown;

[0043] Figure 3 Show Figure 1 A cross-sectional view along the AA direction;

[0044] Figure 4 Show Figure 3 Enlarged view of section B;

[0045] Figure 5 A cross-sectional view of a cold box according to an embodiment of the present invention is shown. Attached image description:

[0047] Pipe insulation structure 100;

[0048] Wall panel 110; through hole 111; first wall 112; second wall 113;

[0049] Pipe 120; First end 121;

[0050] Expansion joint 130; inner surface 131;

[0051] Ring plate 140; inner sidewall 141; outer sidewall 142;

[0052] First reinforcing ring 150; First inner wall 151; First outer wall 152;

[0053] Second reinforcing ring 160; Second outer wall 161;

[0054] Positioning ring assembly 170; short section 171; first short section 1711; second short section 1712; outer surface 1713; reinforcing plate 172; first reinforcing plate 1721; second reinforcing plate 1722; first part 173; second part 174;

[0055] Flange 180;

[0056] Rock wool 190;

[0057] Refrigerated box 200;

[0058] Casing 210. Detailed Implementation

[0059] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0060] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0061] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0062] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0063] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0064] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0065] refer to Figure 1 , Figure 2 , Figure 3This application provides a pipe insulation structure 100, including: a wall panel 110, a pipe 120, an expansion joint 130, a ring plate 140, a first reinforcing ring 150, a second reinforcing ring 160, a positioning ring assembly 170, and a flange 180. The wall panel 110 is along a first direction ( Figure 2 Extending in the middle X direction, a through hole 111 is provided, and the through hole 111 extends along the second direction ( Figure 2 A pipe 120 extends along the second direction (in the Y direction) through the wall panel 110; along the second direction, the wall panel 110 has a first wall 112 and a second wall 113. The first direction and the second direction are perpendicular to each other. The pipe 120 extends along the second direction and has a first end 121, which passes through the through hole 111 and is located on one side of the first wall 112; the pipe 120 and the through hole 111 are spaced apart.

[0066] The pipe 120 and the through hole 111 are spaced apart, that is, the pipe 120 does not directly contact the wall panel 110, thereby preventing the cold energy from being conducted to the wall panel 110 and eliminating the risk of cold embrittlement and energy loss of the wall panel 110.

[0067] refer to Figure 1 , Figure 2 , Figure 3 In this embodiment, a corrugated expansion joint 130 is fitted onto the pipe 120, located between the first wall 112 and the first end 121. One end of the expansion joint 130 is connected to the first wall 112 by welding. The expansion joint 130 is made of stainless steel. The corrosion resistance of the metal material effectively resists atmospheric and environmental erosion, thus ensuring the service life of the expansion joint 130.

[0068] In some possible implementations, the shape of the expansion joint 130 may include, but is not limited to, a corrugated shape, and may be a bend, a sleeve, etc., as long as it can compensate for the contraction and deformation of the pipe 120 when it is cooled. The implementation of this application does not limit this.

[0069] In some possible implementations, the material of the expansion joint 130 may include, but is not limited to, stainless steel, or may also be a nickel-based alloy, copper-nickel alloy or active metal, specifically a corrosion-resistant metal, and is not limited in the implementation of this application.

[0070] In some possible implementations, the connection between one end of the expansion joint 130 and the first wall 112 may include, but is not limited to, welding, bonding, flange and fastener connection, etc., as long as it can be fixed and sealed. This application does not limit this.

[0071] refer to Figure 1 , Figure 2 , Figure 3In this embodiment, the annular plate 140 is sleeved on the pipe 120. The annular plate 140 has an inner sidewall 141 and an outer sidewall 142. The inner sidewall 141 is connected to the outer periphery of the pipe 120 by welding, and the outer sidewall 142 is connected to the inner surface 131 of the expansion joint 130 by welding. The annular plate 140 is circular and made of stainless steel.

[0072] In some possible implementations, the shape of the ring plate 140 may include, but is not limited to, a circular shape, which can be fixed and sealed to the pipe 120 and the expansion joint 130. For example, it may be corrugated, frustum-shaped, etc., but this application does not limit this.

[0073] In some possible implementations, the material of the ring plate 140 may include, but is not limited to, stainless steel, or other alloys, such as carbon steel, nickel-based alloys, and other corrosion-resistant materials. This application does not limit the material to these materials.

[0074] In some possible implementations, the connection between the ring plate 140 and the pipe 120 and expansion joint 130 may include, but is not limited to, welding, as long as it can be fixed and sealed, such as by bonding. This application does not limit this aspect.

[0075] An expansion joint 130 is installed outside the pipe 120. One end of the expansion joint 130 is connected to the pipe 120 via a ring plate 140, and the other end is connected to the wall plate 110. This ensures the sealing of the connection of the expansion joint 130 and prevents cold leakage from the pipe 120. When installing the expansion joint 130, the tension or compression amount (i.e., preload) of the expansion joint 130 can be preset. The expansion joint 130 can effectively absorb the cold contraction deformation of the pipe 120, allowing the expansion joint 130 to undergo corresponding elastic deformation when the pipe 120 contracts, thereby achieving the function of displacement compensation.

[0076] refer to Figure 3 In this embodiment, a gap is provided between the expansion joint 130 and the pipe 120. The gap between the pipe 120 and the expansion joint 130 prevents cold energy from being conducted to the expansion joint 130 and prevents energy loss.

[0077] refer to Figure 3 In this embodiment, rock wool 190 is provided in the gap between the expansion joint 130 and the pipe 120. In some possible embodiments, the material filling the gap includes, but is not limited to, rock wool 190, and other insulation materials with good thermal insulation properties can also be used, such as glass wool, flexible foam rubber or polyurethane foam, etc. This application does not limit this.

[0078] Insulating material is filled between pipe 120 and expansion joint 130 to further prevent cold loss and enhance the overall insulation effect of the structure. At the same time, it can also effectively block direct contact between pipe 120 and wall panel 110, preventing cold from being conducted to wall panel 110.

[0079] refer to Figure 1 , Figure 2 , Figure 3 In this embodiment, the positioning ring assembly 170 includes a short section 171 and a reinforcing plate 172. The short section 171 extends along a second direction, and the reinforcing plate 172 extends along a first direction, with the reinforcing plate 172 disposed on the outer periphery of the short section 171. The positioning ring assembly 170 includes a first portion 173 and a second portion 174. The first portion 173 has a first short section 1711 and a first reinforcing plate 1721; the second portion 174 has a second short section 1712 and a second reinforcing plate 1722. The first short section 1711 and the second short section 1712 are joined together to form the short section 171; the first reinforcing plate 1721 and the second reinforcing plate 1722 are joined together to form the reinforcing plate 172. Both the first portion 173 and the second portion 174 have semi-circular structures.

[0080] In some possible implementations, the positioning ring assembly 170 may include, but is not limited to, two parts that can provide support, such as three or four parts.

[0081] In some possible implementations, the shapes of the first part 173 and the second part 174 include, but are not limited to, semi-circles, or arcs, as long as they can abut against the hole wall. The embodiments of this application do not limit this.

[0082] The positioning ring assembly 170 is designed as a first part 173 and a second part 174 that can be assembled. The split structure allows the first part 173 and the second part 174 to be joined and fixed from both sides after the pipe 120 is in place. This overcomes the limitation of the integral ring that requires the pipe 120 to be inserted, thereby improving installation efficiency and convenience.

[0083] In some possible implementations, the positioning ring assembly 170 may also be an integral structure that can support the wall panel 110; however, this application does not limit this aspect.

[0084] refer to Figure 1 , Figure 2 , Figure 3 In this embodiment, the outer surface 1713 of the short section 171 abuts against the wall of the through hole 111, and the pipe 120 is spaced apart from the short section 171; the reinforcing plate 172 is fixedly connected to the second wall 113. The height h5 of the short section 171 is... Figure 3 (as shown in h5) is greater than the thickness h4 of the wall panel 110. Figure 3(shown in h4).

[0085] Because the wall panel 110 is relatively thin, a positioning ring assembly 170 is provided to support it. Specifically, the positioning ring assembly 170 abuts against the wall of the through hole 111 via a short section 171, and the height of the short section 171 is greater than the thickness of the wall panel 110. This ensures that the short section 171 can fully penetrate the wall panel 110 and provide support for the through hole 111, enhancing the rigidity around the through hole 111 and preventing direct contact between the pipe 120 and the wall panel 110 due to vibration. The reinforcing plate 172 is fixedly connected to the second wall 113 of the wall panel 110, thereby fixing the positioning ring assembly 170 and preventing it from shifting. The pipe 120 and the short section 171 are arranged at intervals, effectively reducing cold conduction and improving the structural strength of the wall panel 110.

[0086] refer to Figure 1 , Figure 2 , Figure 3 In this embodiment, flange 180 is fixedly connected to the first end 121 of pipe 120 for connecting other pipes or equipment within the system. In some possible embodiments, flange 180 may not be provided, and this embodiment of the present application does not limit this.

[0087] refer to Figure 3 , Figure 4 , Figure 4 for Figure 3 An enlarged view of part B shows that, in this embodiment, along the second direction, a first reinforcing ring 150 is disposed between the ring plate 140 and the expansion joint 130, having a first inner wall 151 and a first outer wall 152. The first inner wall 151 is fixedly connected to the outer wall 142, and the first outer wall 152 is fixedly connected to the inner surface 131 of the expansion joint 130. The thickness h2 of the first reinforcing ring 150 is... Figure 4 The thickness h1 of the expansion joint 130 is greater than that shown in h2. Figure 4 (as shown in h1).

[0088] To achieve elastic deformation, the expansion joint 130 typically has a thin wall thickness. Since the expansion joint 130 is directly connected to the ring plate 140, the connection is weak and prone to tearing during expansion joint 130 contraction. A first reinforcing ring 150, with a thickness greater than that of the expansion joint 130, is added. When the first reinforcing ring 150 is connected to the ring plate 140, its increased thickness enhances the rigidity of the connection. Furthermore, when its first outer wall 152 is connected to the inner surface 131 of the expansion joint 130, the connection strength can be further increased by adjusting the connection area between the first outer wall 152 and the inner surface 131.

[0089] In some possible implementations, the pipe insulation structure 100 may not have the first reinforcing ring 150, and the expansion joint 130 may be directly connected to the ring plate 140.

[0090] refer to Figure 3 , Figure 4 In this embodiment, along the second direction, a second reinforcing ring 160 is disposed between the wall panel 110 and the expansion joint 130, having a second outer wall 161, one end of which is fixedly connected to the wall panel 110, and the second outer wall 161 is fixedly connected to the inner surface 131 of the expansion joint 130. The thickness h3 of the second reinforcing ring 160 is... Figure 4 (As shown in h3) is greater than the thickness h1 of the expansion joint 130.

[0091] By adding a second reinforcing ring 160 with a thickness greater than that of the expansion joint 130, the increased thickness enhances the connection strength when the end of the second reinforcing ring 160 is connected to the wall panel 110, preventing the connection from breaking when the expansion joint 130 contracts. When its second outer wall 161 is connected to the inner surface 131 of the expansion joint 130, the connection strength can be further increased by adjusting the connection area between the second outer wall 161 and the inner surface 131.

[0092] In some possible implementations, the pipe insulation structure 100 may not have the second reinforcing ring 160, and the expansion joint 130 may be directly connected to the wall panel 110.

[0093] The pipe insulation structure 100 of this embodiment can effectively prevent the loss of cold energy from the low-temperature pipe 120; the metal expansion joint 130 is designed to provide the necessary flexible compensation for the pipe 120 due to cold contraction, and has excellent corrosion resistance, which can adapt to harsh working conditions including seawater corrosion.

[0094] refer to Figure 5 This application also provides a cold box 200, including: a pipe insulation structure 100 as described in any of the above embodiments and an outer shell 210, wherein the wall panel 110 in the pipe insulation structure 100 is fixedly connected to the outer shell 210.

[0095] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A pipe cold insulation structure, characterized by, include: A wall panel extending along a first direction has a through hole, the through hole penetrating the wall panel along a second direction; Along the second direction, the wall panel has a first wall; A pipe extending in the second direction has a first end that passes through the through hole and is located on one side of the first wall; the pipe is spaced apart from the through hole. An expansion joint is fitted onto the pipe and located between the first wall and the first end. One end of the expansion joint is fixedly connected to the first wall, and a gap is provided between the expansion joint and the pipe. A ring plate is fitted onto the pipe. The ring plate has an inner side wall and an outer side wall. The inner side wall is fixedly connected to the outer periphery of the pipe, and the outer side wall is fixedly connected to the inner surface of the expansion joint. Wherein, the first direction and the second direction are perpendicular to each other.

2. The pipe insulation structure of claim 1, wherein, The gap between the expansion joint and the pipe is filled with heat-insulating material.

3. The pipe insulation structure of claim 2, wherein, The insulation material is rock wool.

4. The pipe insulation structure of claim 1, wherein The expansion joint is made of metal.

5. The pipe insulation structure of claim 1, wherein Also includes: A first reinforcing ring, along the second direction, is disposed between the ring plate and the expansion joint, and has a first inner wall and a first outer wall. The first inner wall is fixedly connected to the outer wall, and the first outer wall is fixedly connected to the inner surface of the expansion joint. The thickness of the first reinforcing ring is greater than the thickness of the expansion joint.

6. The pipe insulation structure of claim 1, wherein Also includes: The second reinforcing ring, along the second direction, is disposed between the wall panel and the expansion joint, has a second outer wall, one end of which is fixedly connected to the wall panel, and the second outer wall is fixedly connected to the inner surface of the expansion joint; The thickness of the second reinforcing ring is greater than the thickness of the expansion joint.

7. The pipe insulation structure of claim 1, wherein Also includes: The positioning ring assembly includes a short section and a reinforcing plate, wherein the short section extends along a second direction, the reinforcing plate extends along a first direction, and the reinforcing plate is disposed on the outer periphery of the short section; Along the second direction, the wall panel has a second wall; The outer surface of the short section abuts against the wall of the through hole, and the pipe is spaced apart from the short section; the reinforcing plate is fixedly connected to the second wall; The height of the short section is greater than the thickness of the wall panel.

8. The pipe insulation structure of claim 7, wherein, The positioning ring assembly includes a first part and a second part, wherein the first part has a first short section and a first reinforcing plate; and the second part has a second short section and a second reinforcing plate. The first short section and the second short section are combined to form the short section; the first reinforcing plate and the second reinforcing plate are combined to form the reinforcing plate.

9. The pipe insulation structure of claim 1, wherein, Also includes: A flange is fixedly connected to the first end of the pipe.

10. A cold box characterized in that, include: The pipe insulation structure as described in any one of claims 1-9; The outer shell, the wall panel in the pipe insulation structure is fixedly connected to the outer shell.

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