Flexible non-metal expansion joint structure with wide temperature range

Abstract

The utility model provides a wide temperature range flexible nonmetal expansion joint structure belongs to pipeline compensation technical field, including upper and lower presser plate, threaded pull rod, fastening bolt, nonmetal compensation body and flow guide tube, and the upper and lower presser plate has the movable slot, and the sealing washer of nonmetal compensation body opening part is embedded in movable slot, and the limiting ring of flow guide tube end part also contains in movable slot and is pasted with sealing washer, the utility model discloses a unique design of movable slot - sealing washer - limiting ring, creates a dynamic sealing and transmission interface, so that nonmetal compensation body can through sealing washer push flow guide tube synchronous movement when heat expansion, realizes linkage compensation, and effectively released interface stress, and in combination with the multilayer wide temperature range composite structure and the corrugated appearance of nonmetal compensation body, this expansion joint has reliable sealing, strong compensating capacity, the significant advantage of wide temperature range and long service life.

Description

Technical Field

[0001] This utility model relates to the field of pipeline compensation technology, and in particular to a wide-temperature-range flexible non-metallic expansion joint structure. Background Technology

[0002] Non-metallic expansion joints are widely used in flue gas ducts and ventilation systems to compensate for displacement caused by thermal expansion and contraction, installation errors or foundation settlement, and also have the functions of vibration reduction and noise reduction. Traditional non-metallic expansion joints are usually composed of non-metallic skin and metal frame. However, existing non-metallic expansion joints have the following shortcomings: First, the non-metallic compensator is rigidly fixed to the frame. When subjected to drastic temperature changes and multi-directional displacement, stress concentration occurs at the interface, which is prone to fatigue damage and leakage. Secondly, a fixed guide tube cannot effectively adapt to the axial expansion and contraction of the pipeline system, which may lead to deformation of the guide tube itself or interference wear with non-metallic bodies. Especially under wide temperature range conditions, the difference in the thermal expansion coefficient of materials is greater, and the above problems are more prominent, thereby reducing the service life and reliability of the expansion joint. Therefore, there is an urgent need for a non-metallic expansion joint structure that can adapt to a wider operating temperature range while possessing greater flexibility and a longer service life. Utility Model Content

[0003] The purpose of this invention is to solve the problems existing in the above-mentioned background technology by proposing a wide-temperature-range flexible non-metallic expansion joint structure.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A wide-temperature-range flexible non-metallic expansion joint structure includes an upper pressure plate, a lower pressure plate, a threaded tie rod, fastening bolts, a non-metallic compensator, and a guide tube; the upper and lower pressure plates have movable grooves inside; The non-metallic compensator is provided with sealing gaskets at the front and rear openings, and the sealing gaskets at both ends of the non-metallic compensator are correspondingly embedded in the movable grooves of the upper pressure plate and the lower pressure plate. The guide tube passes through the upper pressure plate and the lower pressure plate and extends outward. A limit ring is provided on the outer edge of one end of the guide tube. The limit ring is housed in the movable groove, and one end of the limit ring is in contact with the sealing gasket. When the non-metallic compensator expands due to heat, the sealing gaskets at both ends can push the limiting ring of the guide tube within the movable groove, causing the guide tube to move axially to achieve compensation.

[0005] Preferably, the non-metallic compensator is a multi-layer composite structure, comprising at least a temperature-resistant and corrosion-resistant layer, a heat insulation layer, and a main elastic sealing layer from the inside out.

[0006] Preferably, the non-metallic compensator is further provided with an outer protective layer outside the main elastic sealing layer, which is a weather-resistant silicone rubber coated fiberglass cloth or a fluororubber coated fiberglass cloth.

[0007] Preferably, the cross-section of the non-metallic compensator has a continuous U-shaped or Ω-shaped corrugated structure.

[0008] Preferably, the upper pressure plate and the lower pressure plate are connected to each other by the threaded tie rod and the fastening bolt, and the non-metallic compensator and the sealing gasket are pressed and fixed together.

[0009] Preferably, the cross-sectional shape of the movable groove is annular, and the movable groove extends from one side opening to the inner side of the inner annular edge of the other side opening.

[0010] Preferably, the sealing gasket and the limiting ring have the same diameter.

[0011] Preferably, the sealing gasket is made of an elastic, high-temperature resistant material, such as graphite packing, asbestos-free fiber rubber gasket, or flexible graphite composite gasket.

[0012] Preferably, the temperature-resistant and corrosion-resistant layer is a polytetrafluoroethylene (PTFE) film or a glass fiber cloth coated with a Teflon layer, the heat insulation layer is a ceramic fiber cloth or a high-silica cloth, and the main elastic sealing layer is a silicone rubber coated glass fiber cloth or a fluororubber coated glass fiber cloth.

[0013] Preferably, there is a gap between the guide tube and the upper and lower pressure plates, allowing the guide tube to move axially.

[0014] In the above solution, the thrust is transmitted through the sealing gasket and the guide tube is moved, realizing the linkage between the non-metallic body and the guide tube. This transforms the static fixed interface into a dynamic flexible interface, effectively releasing stress and avoiding fatigue damage at the interface.

[0015] In the above scheme, the combination of multi-layer composite non-metallic compensator and dynamic compensation mechanism enables the structure to adapt to extreme temperature environments from ultra-low temperature to high temperature, with stable performance. Due to the significant reduction of mechanical stress and thermal stress in key parts, the fatigue resistance and durability of the entire expansion joint are greatly improved.

[0016] In the above scheme, the movable groove provides good constraint and limitation between the sealing gasket and the guide tube, ensuring sealing reliability under various working conditions. Attached Figure Description

[0017] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the present disclosure and, together with the specification, further serve to explain the principles of the present disclosure and enable those skilled in the art to implement and use the present disclosure.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the disassembled structure of this utility model; Figure 3 This is a schematic diagram of the cross-sectional structure of the non-metallic compensator of this utility model; Figure 4 This is a schematic diagram of the specific structure of the upper pressure plate of this utility model; Figure 5 This is a schematic diagram of the specific structure of the guide tube of this utility model.

[0019] [Figure Labels] 1-Upper pressure plate; 2-Lower pressure plate; 3-Threaded tie rod; 4-Fastening bolt; 5-Non-metallic compensator; 6-Sealing gasket; 7-Flow guide tube; 101-Moving groove; 501-Temperature resistant and corrosion resistant layer; 502-Heat insulation layer; 503-Main elastic sealing layer; 504-Outer protective layer; 701-Limiting ring.

[0020] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of this utility model. However, this is only for illustrative purposes and is not intended to limit this utility model to the specific structure, device and environment. According to specific needs, those skilled in the art can adjust or modify these devices and environments, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] like Figure 1 , Figure 2 , Figure 3, Figure 4 and Figure 5 The wide-temperature-range flexible non-metallic expansion joint structure shown in the embodiment of this utility model includes an upper pressure plate 1, a lower pressure plate 2, a threaded tie rod 3, a fastening bolt 4, a non-metallic compensator 5, and a guide tube 7. The upper pressure plate 1 and the lower pressure plate 2 are provided with movable grooves 101 inside; A sealing gasket 6 is provided at the front and rear openings of the non-metallic compensator 5, and the sealing gaskets 6 at both ends of the non-metallic compensator 5 are correspondingly embedded in the movable grooves 101 of the upper pressure plate 1 and the lower pressure plate 2. The guide tube 7 passes through the upper pressure plate 1 and the lower pressure plate 2 and extends outward. A limit ring 701 is provided on the outer edge of one end of the guide tube 7. The limit ring 701 is housed in the movable groove 101, and one end of the limit ring 701 is in contact with the sealing gasket 6. When the non-metallic compensator 5 expands due to heat, the sealing gaskets 6 at both ends can push the limiting ring 701 of the guide tube 7 in the movable groove 101, so that the guide tube 7 moves axially to achieve compensation.

[0024] In this embodiment, the non-metallic compensator 5 is a multi-layer composite structure, which includes at least a temperature-resistant and corrosion-resistant layer 501, a heat insulation layer 502, and a main elastic sealing layer 503 from the inside to the outside.

[0025] In this embodiment, the non-metallic compensator 5 is provided with an outer protective layer 504 on the outside of the main elastic sealing layer 503. The outer protective layer 504 is a weather-resistant silicone rubber coated fiberglass cloth or a fluororubber coated fiberglass cloth.

[0026] In this embodiment, the cross-section of the non-metallic compensator 5 has a continuous U-shaped or Ω-shaped corrugated structure.

[0027] In this embodiment, the upper pressure plate 1 and the lower pressure plate 2 are connected to each other by threaded tie rod 3 and fastening bolt 4, and the non-metallic compensator 5 and the sealing gasket 6 are pressed and fixed.

[0028] In this embodiment, the cross-sectional shape of the movable groove 101 is annular, and the movable groove 101 extends from one side opening to the inner side of the inner annular edge of the other side opening.

[0029] In this embodiment, the sealing gasket 6 and the limiting ring 701 have the same diameter.

[0030] In this embodiment, the sealing gasket 6 is made of an elastic, high-temperature resistant material, such as graphite packing, asbestos-free fiber rubber gasket, or flexible graphite composite gasket.

[0031] In this embodiment, the heat-resistant and corrosion-resistant layer 501 is a polytetrafluoroethylene (PTFE) film or a glass fiber cloth coated with a Teflon layer, the heat insulation layer 502 is a ceramic fiber cloth or a high-silica cloth, and the main elastic sealing layer 503 is a silicone rubber coated glass fiber cloth or a fluororubber coated glass fiber cloth.

[0032] In this embodiment, there is a gap between the guide tube 7 and the upper pressure plate 1 and the lower pressure plate 2, which allows the guide tube 7 to move axially.

[0033] The technical solution provided by this utility model, the wide temperature range flexible non-metallic expansion joint structure of this utility model, is mainly composed of a metal frame part and a flexible compensation part. The metal frame includes an upper pressure plate 1, a lower pressure plate 2, threaded tie rods 3, and fastening bolts 4. The upper and lower pressure plates are connected by the threaded tie rods 3 and locked in place by the fastening bolts 4. On the opposite inner sides of the upper and lower pressure plates 1 and 2, there are machined movable grooves 101 with an annular cross-section. The core of the flexible compensation section is the non-metallic compensator 5, which has a continuous U-shaped corrugated cross-section and good elasticity. The compensator 5 adopts a multi-layer composite structure: the innermost layer is a temperature-resistant and corrosion-resistant layer 501, made of PTFE-impregnated fiberglass cloth, which directly contacts the medium; the outermost layer is a heat insulation layer 502, made of ceramic fiber cloth, which provides heat insulation; the middle layer is the main elastic sealing layer 503, made of silicone rubber-coated fiberglass cloth, providing the main elasticity and sealing; the outermost layer is an outer protective layer 504, made of weather-resistant silicone rubber-coated fiberglass cloth, which resists external environmental corrosion. At the front and rear opening edges of the non-metallic compensator 5, annular sealing gaskets 6 are mechanically fixed. In this embodiment, the sealing gaskets 6 are flexible graphite composite gaskets, which have good elasticity and high-temperature resistance. The guide tube 7 is made of corrosion-resistant metal sheet, with upper and lower pressure plates passing through both ends. A limiting ring 701 is welded to the outer edge of each end of the guide tube 7. During installation, the limiting ring 701 at one end of the guide tube 7 is pushed into the movable groove 101, so that one end of the guide tube 7 passes through the upper pressure plate 1 and the lower pressure plate 2. Then, both ends of the non-metallic compensator 5 are embedded into the upper pressure plate 1 or the lower pressure plate 2, and the end face of the sealing gasket 6 is made to fit tightly against the limiting ring 701. Finally, the other side of the non-metallic compensator 5 is installed in the same way, and the fastening bolts 4 are tightened to complete the assembly.

[0034] Working principle: When the pipe expands due to heat, it pushes one of the guide tubes 7 towards the other end. This movement compresses the sealing gasket 6 on the same side through the limiting ring 701. Simultaneously, the expansion joint is stretched due to the expansion of the other pipe, generating tension on the sealing gasket 6 and non-metallic compensator 5 on the other side through the limiting ring 701 of the other guide tube 7. During this process, the corrugated portion of the non-metallic compensator 5 is stretched, while the sealing gasket 6 remains sealed and transmits force within the movable groove 101. The entire system deforms in a coordinated manner, absorbing displacement. Conversely, the process is reversed when the pipe cools and contracts. This design eliminates the rigid constraint between the guide tube and the non-metallic compensator, allowing for coordinated and flexible movement, thereby greatly improving the stress conditions.

[0035] This utility model encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this utility model. To provide the public with a thorough understanding of this utility model, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand this utility model even without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of this utility model, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0036] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A wide-temperature-range flexible non-metallic expansion joint structure, comprising an upper pressure plate (1), a lower pressure plate (2), a threaded tie rod (3), fastening bolts (4), a non-metallic compensator (5), and a guide tube (7), characterized in that: The upper pressure plate (1) and the lower pressure plate (2) are provided with movable grooves (101). The non-metallic compensator (5) is provided with sealing gaskets (6) at the front and rear openings, and the sealing gaskets (6) at both ends of the non-metallic compensator (5) are correspondingly embedded in the movable grooves (101) of the upper pressure plate (1) and the lower pressure plate (2). The guide tube (7) passes through the upper pressure plate (1) and the lower pressure plate (2) and extends outward. A limiting ring (701) is provided on the outer edge of one end of the guide tube (7). The limiting ring (701) is housed in the movable groove (101), and one end of the limiting ring (701) is in contact with the sealing gasket (6). When the non-metallic compensator (5) expands due to heat, the sealing gaskets (6) at both ends can push the limiting ring (701) of the guide tube (7) in the movable groove (101), so that the guide tube (7) moves axially to achieve compensation.

2. The wide-temperature-range flexible non-metallic expansion joint structure according to claim 1, characterized in that: The non-metallic compensator (5) is a multi-layer composite structure, which includes at least a temperature-resistant and corrosion-resistant layer (501), a heat insulation layer (502), and a main elastic sealing layer (503) from the inside to the outside.

3. The wide-temperature-range flexible non-metallic expansion joint structure according to claim 2, characterized in that: The non-metallic compensator (5) is provided with an outer protective layer (504) on the outside of the main elastic sealing layer (503). The outer protective layer (504) is a weather-resistant silicone rubber coated fiberglass cloth or a fluororubber coated fiberglass cloth.

4. The wide-temperature-range flexible non-metallic expansion joint structure according to claim 1, characterized in that: The cross-section of the non-metallic compensator (5) has a continuous U-shaped or Ω-shaped corrugated structure.

5. The wide-temperature-range flexible non-metallic expansion joint structure according to claim 1, characterized in that: The upper pressure plate (1) and the lower pressure plate (2) are connected to each other by the threaded tie rod (3) and the fastening bolt (4), and the non-metallic compensator (5) is pressed and fixed with the sealing gasket (6).

6. The wide-temperature-range flexible non-metallic expansion joint structure according to claim 1, characterized in that: The cross-sectional shape of the movable groove (101) is annular, and the movable groove (101) extends from one side opening to the inner side of the inner annular edge of the other side opening.

7. The wide-temperature-range flexible non-metallic expansion joint structure according to claim 1, characterized in that: The sealing gasket (6) has the same diameter as the limiting ring (701).

8. The wide-temperature-range flexible non-metallic expansion joint structure according to claim 1, characterized in that: The sealing gasket (6) is made of elastic high-temperature resistant material, such as graphite packing, asbestos-free fiber rubber gasket, or flexible graphite composite gasket.

9. The wide-temperature-range flexible non-metallic expansion joint structure according to claim 2, characterized in that: The heat-resistant and corrosion-resistant layer (501) is a polytetrafluoroethylene (PTFE) film or a glass fiber cloth coated with a Teflon layer, the heat insulation layer (502) is a ceramic fiber cloth or a high-silica cloth, and the main elastic sealing layer (503) is a silicone rubber coated glass fiber cloth or a fluororubber coated glass fiber cloth.

10. The wide-temperature-range flexible non-metallic expansion joint structure according to claim 1, characterized in that: There is a gap between the guide tube (7) and the upper pressure plate (1) and the lower pressure plate (2), allowing the guide tube (7) to move axially.

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