Expansion joint structure of through-wall pipe

Abstract

The utility model discloses a through-wall pipe expansion joint structure which is characterized in that a heat insulation layer is arranged on an original through-wall pipe expansion joint, the heat insulation layer is arranged between the bottom of an outer heat preservation layer and a lower metal flange in a surrounding mode, and a gap between an inner heat preservation layer and the outer heat preservation layer is separated from a non-metal expansion joint skin through the heat insulation layer. The technical problems that the temperature of the non-metal expansion joint skin is increased indirectly due to the fact that the through-wall pipe is heated to radiate heat to the first gap and then radiate to the second gap, and the risks of material aging and performance reduction of the non-metal expansion joint skin are caused are solved.

Description

Technical Field

[0001] The utility model relates to the field of boilers, in particular to a wall-piercing pipe expansion joint structure. Background Art

[0002] In the existing boiler system, as a key component, the thermal expansion management of the wall-piercing pipe is crucial for ensuring the safe operation of the boiler and extending the service life of the equipment.

[0003] In Patent 201620803963.X, as Figure 1 shown, a wall-piercing pipe braided expansion joint is proposed. In this patent, when the wall-piercing pipe undergoes displacement, the inner insulation layer displaces relative to the upper insulation layer and moves away from the upper insulation layer, causing a first gap to form between the outer insulation layer and the wall-piercing pipe. At the same time, there is a second gap between the outer insulation layer and the non-metallic expansion joint skin. Due to the high-temperature radiation of the wall-piercing pipe, the temperature in the first gap will increase. The temperature in the first gap will gradually penetrate into the second gap through the gap between the inner insulation layer and the outer insulation layer. Since the second gap is in direct contact with the non-metallic expansion joint skin of the non-metallic expansion joint, this heat penetration will directly cause the temperature of the non-metallic expansion joint skin to increase. The non-metallic expansion joint skin in a high-temperature environment also faces the risks of material aging and performance degradation, thereby shortening its service life and posing a potential threat to the stability and safety of the entire boiler system. Summary of the Utility Model

[0004] The utility model aims to solve the technical problem in the above-mentioned prior art that the wall-piercing pipe expansion joint structure will transfer heat to the non-metallic expansion joint skin, resulting in a reduction in the service life of the non-metallic expansion joint skin, and proposes a wall-piercing pipe expansion joint structure.

[0005] The technical solution adopted by the utility model is as follows:

[0006] The utility model proposes a wall-piercing pipe expansion joint structure, including a non-metallic expansion joint skin, an upper metal flange for fixing the upper end of the non-metallic expansion joint skin to the furnace wall panel, a lower metal flange for fixing the lower end of the non-metallic expansion joint skin to the wall-piercing pipe, an inner insulation layer provided in the non-metallic expansion joint skin and wrapping the wall-piercing pipe, an upper insulation layer provided in the upper metal flange, an outer insulation layer is further provided between the inner insulation layer and the non-metallic expansion joint skin, the outer insulation layer is connected to the upper insulation layer. After the wall-piercing pipe is heated, the inner insulation layer can displace relative to the outer insulation. It further includes a heat insulation layer disposed around between the bottom of the outer insulation layer and the lower metal flange, and the heat insulation layer separates the gap between the inner insulation layer and the outer insulation layer from the non-metallic expansion joint skin.

[0007] Furthermore, the heat insulation layer is formed into wrinkles by pressing. When the inner heat preservation layer displaces relative to the outer heat preservation layer, the heat insulation layer gradually extends, and the length of the heat insulation layer after being fully extended is greater than the maximum displacement of the inner heat preservation layer and the outer heat preservation layer.

[0008] Furthermore, the material of the heat insulation layer is ceramic fiber cloth with steel wires.

[0009] Furthermore, the outer heat preservation layer and the inner heat preservation layer are respectively wound with metal bands along their axial directions. The upper edge of the heat insulation layer is fixed by the metal band on the outer heat preservation layer, and the lower edge of the heat insulation layer is fixed by the metal band on the inner heat preservation layer.

[0010] Furthermore, the outer heat preservation layer is fixedly connected end to end with the upper heat preservation layer through a metal hook member. One end of the metal hook member hangs on the metal band on the outer heat preservation layer, and the other end is welded to the upper metal flange.

[0011] Furthermore, the metal hook member includes a C-shaped steel hook and an L-shaped steel hook. The C-shaped steel hook is hooked to the metal band, one end of the L-shaped steel hook is welded to the inner wall of the upper metal flange, and the other end is welded to the C-shaped steel hook.

[0012] Furthermore, the metal band is a stainless steel band.

[0013] Furthermore, the upper and lower ends of the non-metallic expansion joint skin are respectively connected to the upper metal flange and the lower metal flange through clamps.

[0014] Furthermore, the non-metallic expansion joint skin is formed by laminating at least two layers of polytetrafluoroethylene, at least one layer of glass fiber, and at least one layer of ceramic fiber in an arranged combination. The edge of the non-metallic expansion joint skin is provided with a hem, and the hem is made of ceramic fiber.

[0015] Furthermore, for the structure of the through-wall pipe expansion joint, the axial length of the outer heat preservation layer is greater than the axial displacement of the inner heat preservation layer relative to the upper heat preservation layer after the through-wall pipe is heated.

[0016] Compared with the prior art, the present utility model provides a structure of a through-wall pipe expansion joint. A heat insulation layer is provided on the original through-wall pipe expansion joint. The heat insulation layer is disposed around the bottom of the outer heat preservation layer and the lower metal flange. The heat insulation layer separates the gap between the inner heat preservation layer and the outer heat preservation layer and the non-metallic expansion joint skin, and solves the technical problem that the heat radiation of the through-wall pipe to the first gap and then to the second gap indirectly causes the temperature of the non-metallic expansion joint skin to rise, resulting in the risk of material aging and performance degradation of the non-metallic expansion joint skin. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Schematic diagram of the prior art structure;

[0019] Figure 2 Schematic diagram of the structure of the boiler in the embodiment of the present utility model when not in operation;

[0020] Figure 3 Schematic diagram of the structure of the boiler in the embodiment of the present utility model when in operation;

[0021] 1. Non-metallic expansion joint skin;

[0022] 2. Upper metal flange;

[0023] 4. Upper thermal insulation layer;

[0024] 5. Wall-piercing pipe;

[0025] 6. Lower metal flange;

[0026] 7. Boiler wall panel;

[0027] 8. Clamp;

[0028] 9. C-shaped steel hook;

[0029] 10. L-shaped steel hook;

[0030] 11. Metal strip;

[0031] 12. Heat insulation layer;

[0032] 13. First gap;

[0033] 14. Second gap. Detailed implementation manners

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0035] The principle and structure of the present utility model will be described in detail below with reference to the drawings and embodiments.

[0036] In the existing boiler system, the wall-piercing pipe is a key component, and its thermal expansion management is crucial for ensuring the safe operation of the boiler and extending the equipment life.

[0037] In Patent 201620803963.X, as Figure 1 shown, a woven expansion joint for the wall-piercing pipe is proposed. As Figure 1 shown, in this patent, when the wall-piercing pipe undergoes displacement, the inner insulation layer displaces relative to the upper insulation layer and moves away from the upper insulation layer, causing a first gap 13 to form between the outer insulation layer and the wall-piercing pipe. At the same time, there is a second gap 14 between the outer insulation layer and the non-metallic expansion joint skin. Due to the high-temperature radiation of the wall-piercing pipe, the temperature in the first gap 13 will increase. The temperature in the first gap 13 will gradually penetrate into the second gap 14 through the gap between the inner insulation layer and the outer insulation layer. Since the second gap 14 is in direct contact with the non-metallic expansion joint skin of the non-metallic expansion joint, this heat penetration will directly cause the temperature of the non-metallic expansion joint skin to rise. The non-metallic expansion joint skin in a high-temperature environment also faces the risks of material aging and performance degradation, thereby shortening its service life and posing a potential threat to the stability and safety of the entire boiler system.

[0038] As Figures 2-3 shown, the present utility model proposes a structure of a wall-piercing pipe expansion joint, and its components include a non-metallic expansion joint skin 1, an upper metal flange 2, a lower metal flange 6, an upper insulation layer 4, an inner insulation layer 30, an outer insulation layer 31, a clamp 8, a C-shaped steel hook 9, an L-shaped steel hook 10, a metal strip 11, and a heat insulation layer 12.

[0039] One set of non-metal expansion joint skin is sleeved around the periphery of the wall-piercing pipe 5. Its upper end is fixed to one side of the furnace wall panel 7 through a clamp 8 and an upper metal flange 2. Its lower end is fixed through a clamp 8 and a lower metal flange 6. An upper heat-insulating layer 4 is arranged inside the upper metal flange 2 to wrap around the periphery of the wall-piercing pipe 5. The inner heat-insulating layer 30 and the outer heat-insulating layer 31 are laminated inside the non-metal expansion joint skin 1 to wrap the part of the wall-piercing pipe 5 located inside the non-metal expansion joint skin 1. The radial thickness of the laminated inner heat-insulating layer 30 and outer heat-insulating layer 31 is basically the same as the radial thickness of the upper heat-insulating layer 4. Metal strips 11 are wound along the axial direction on the outer heat-insulating layer 31. These metal strips 11 are in a spring shape or a spiral shape. The C-shaped steel hooks 9 and the L-shaped steel hooks 10 are welded to each other to form a metal hook member. One end of the metal hook member hangs on the metal strip 11 at the end of the outer heat-insulating layer 31, and the other end is welded to the upper metal flange, so that the upper heat-insulating layer 4 and the outer heat-insulating layer 31 form an end-to-end connection effect. Specifically, when implemented, the C-shaped steel hook 9 hangs on the metal strip 11, and then one end of the L-shaped steel hook 10 is welded to the inner wall of the upper metal flange 2, and the other end is welded to the C-shaped steel hook 9. The heat-insulating layer 12 is arranged around the bottom of the outer heat-insulating layer and between the lower metal flanges. The heat-insulating layer 12 separates the gap between the inner heat-insulating layer and the outer heat-insulating layer and the non-metal expansion joint skin. It prevents the temperature of the wall-piercing pipe 5 from radiating thermally to the non-metal expansion joint skin, resulting in too high a temperature of the non-metal expansion joint skin.

[0040] Specifically, when the equipment is running, the temperature of the wall-piercing pipe 5 rises, and the wall-piercing pipe 5 will displace along its axial direction. At this time, the inner heat-insulating layer 30 and the lower metal flange 6 directly wrapped on the wall-piercing pipe will also displace together. Since the outer heat-insulating layer 31 is fixed to the upper metal flange 2 through the metal hook member, therefore, the ends of the outer heat-insulating layer 31 and the upper heat-insulating layer 4 always remain tightly connected and will not move. So, a first gap 13 will be formed between the outer heat-insulating layer and the wall-piercing pipe. At the same time, there is a second gap 14 between the outer heat-insulating layer and the non-metal expansion joint skin. The temperature in the first gap 13 will gradually penetrate into the second gap 14 from the gap between the inner heat-insulating layer and the outer heat-insulating layer. By arranging the heat-insulating layer 12 between the lower metal flanges at the bottom of the outer heat-insulating layer, the heat in the first gap 13 will not radiate into the second gap 14 through the gap between the inner heat-insulating layer and the outer heat-insulating layer, and it can prevent the temperature in the first gap 13 from radiating at a high temperature into the second gap 14 between the inner heat-insulating layer and the non-metal expansion joint skin, resulting in problems such as an increase in the temperature of the non-metal expansion joint skin, material aging, and performance degradation.

[0041] The material of the heat insulation layer 12 is ceramic fiber cloth with steel wires. The heat insulation layer 12 is formed into folds by pressing. When the inner heat insulation layer displaces relative to the outer heat insulation layer, the heat insulation layer 12 gradually stretches. The length of the heat insulation layer 12 after complete stretching is greater than the maximum displacement of the inner heat insulation layer and the outer heat insulation layer. The outer heat insulation layer and the inner heat insulation layer are respectively wound with metal bands along their axial directions. The upper edge of the heat insulation layer 12 is fixed by the metal band on the outer heat insulation layer, and the lower side of the heat insulation layer 12 is fixed by the metal band on the inner heat insulation layer.

[0042] The non-metallic expansion joint skin is formed by laminating at least two layers of polytetrafluoroethylene, at least one layer of glass fiber, and at least one layer of ceramic fiber in an arranged combination. The edge of the non-metallic expansion joint skin is provided with a hem, and the hem is made of ceramic fiber.

[0043] Compared with the prior art, the present utility model proposes a structure of a wall-piercing pipe expansion joint, in which a heat insulation layer is provided on the original wall-piercing pipe expansion joint. The heat insulation layer is arranged around the bottom of the outer heat insulation layer and the lower metal flange. The heat insulation layer separates the gap between the inner heat insulation layer and the outer heat insulation layer and the non-metallic expansion joint skin, and solves the technical problem that the heat of the wall-piercing pipe is radiated to the first gap and then radiated to the second gap, indirectly causing the temperature of the non-metallic expansion joint skin to rise, and the risk of material aging and performance degradation of the non-metallic expansion joint skin.

[0044] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A through-wall pipe expansion joint structure, comprising a non-metal expansion joint skin whose upper end is fixed to a furnace wall plate and whose lower end is fixed to a through-wall pipe, an upper metal flange for fixing the upper end of the non-metal expansion joint skin to the furnace wall plate, a lower metal flange for fixing the lower end of the non-metal expansion joint skin to the through-wall pipe, an inner insulation layer arranged in the non-metal expansion joint skin and wrapped around the through-wall pipe, an upper insulation layer arranged in the upper metal flange, an outer insulation layer is further arranged between the inner insulation layer and the non-metal expansion joint skin, and the outer insulation layer is connected to the upper insulation layer, characterized in that: It also includes a heat insulation layer arranged around the bottom of the outer insulation layer and the lower metal flange, and the heat insulation layer separates the gap between the inner insulation layer and the outer insulation layer and the non-metal expansion joint skin.

2. The wall-penetrating pipe expansion joint structure according to claim 1, characterized in that: The heat insulation layer is wrinkled by pressing, and when the inner heat insulation layer is displaced relative to the outer heat insulation layer, the heat insulation layer gradually stretches, and the length of the heat insulation layer after being fully stretched is greater than the maximum displacement of the inner heat insulation layer and the outer heat insulation layer.

3. The wall-penetrating pipe expansion joint structure according to claim 1, characterized in that: The material of the heat insulation layer is ceramic fiber cloth with steel wire.

4. The wall-penetrating pipe expansion joint structure according to claim 1, characterized in that: The outer insulation layer and the inner insulation layer are respectively wrapped with metal strips along their axial directions, the upper edge of the insulation layer is fixed by the metal strip on the outer insulation layer, and the lower edge of the insulation layer is fixed by the metal strip on the inner insulation layer.

5. The wall-penetrating pipe expansion joint structure according to claim 1, characterized in that: The outer insulation layer is fixedly connected to the upper insulation layer end to end through a metal hook, one end of the metal hook hangs on the metal belt on the outer insulation layer, and the other end is welded to the upper metal flange.

6. The wall-penetrating pipe expansion joint structure according to claim 5, characterized in that The metal hook part includes a C-shaped steel hook and an L-shaped steel hook. The C-shaped steel hook is hung on the metal belt. One end of the L-shaped steel hook is welded to the inner wall of the upper metal flange, and the other end is welded to the C-shaped steel hook.

7. The wall-penetrating pipe expansion joint structure according to claim 4, characterized in that: The metal belt is a stainless steel belt.

8. The wall-penetrating pipe expansion joint structure according to claim 1, characterized in that: The upper and lower ends of the non-metal expansion joint skin are connected to the upper metal flange and the lower metal flange through clamps respectively.

9. The wall-penetrating pipe expansion joint structure according to claim 1, characterized in that: The non-metal expansion joint skin is formed by stacking at least two layers of polytetrafluoroethylene, at least one layer of glass fiber and at least one layer of ceramic fiber in an arranged, combined and stacked manner. The edge of the non-metal expansion joint skin is provided with a edging made of ceramic fiber.

10. The wall-penetrating pipe expansion joint structure according to any one of claims 1 to 9, characterized in that: The axial length of the outer insulation layer is greater than the axial displacement of the inner insulation layer relative to the upper insulation layer after the wall-penetrating pipe is heated.

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