Heat insulation expansion joint

Abstract

The embodiment of the utility model provides a heat insulation expansion joint which comprises a corrugated pipe, a lining pipe and at least two flange plates, a heat preservation layer is arranged between the corrugated pipe and the lining pipe, the flange plates are arranged at the ends of the corrugated pipe, the lining pipe is provided with a turnover edge, and the turnover edge is connected with the flange plates. The folded edge is flush with the flange plate to form a joint face, and the joint face is used for being connected with an external pipeline. The heat insulation expansion joint can effectively dissipate heat so as to slow down the aging process of the heat preservation layer and the corrugated pipe, and normal operation of the expansion joint is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline transmission systems, and particularly relates to a heat-insulating expansion joint. Background Art

[0002] In a pipeline system for handling the transmission of high-temperature media, expansion joints are mainly used to absorb the length changes of pipelines or shells caused by factors such as temperature changes. In related technologies, heat-insulating and heat-preserving layers are usually filled between the inner and outer sleeves and the corrugated pipe to reduce the thermal influence of high-temperature media on the corrugated pipe and external structures.

[0003] However, although the heat-insulating and heat-preserving layer blocks heat transfer, a large amount of heat will accumulate on the inner and outer sleeves and cannot be effectively dissipated, forming long-term high-temperature penetration, which will accelerate the thermal aging process of the heat-insulating and heat-preserving layer and the corrugated pipe, and even affect the sealing performance of the expansion joint, and may also cause internal fluid leakage, further increasing the risk of equipment damage. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems in the related technologies to some extent. To this end, an embodiment of the utility model provides a heat-insulating expansion joint, which can effectively dissipate heat to slow down the aging process of the heat-insulating layer and the corrugated pipe, and ensure the normal operation of the expansion joint.

[0005] The heat-insulating expansion joint provided by the embodiment of the utility model includes a corrugated pipe, a lining pipe, and at least two flange plates. A heat-insulating layer is provided between the corrugated pipe and the lining pipe. The flange plates are arranged at the ends of the corrugated pipe. The lining pipe has a folded edge, and the folded edge is connected to the flange plate and is flush with the flange plate to form a joint surface for connecting an external pipeline.

[0006] By providing a folded edge on the lining pipe, the heat-insulating expansion joint provided by the embodiment of the utility model enables the folded edge to be connected to the flange plate and remain flush to form a joint surface, and connects the external pipeline through the joint surface, which can effectively discharge heat, avoid the occurrence of local external heat phenomenon, and reduce the risk of material failure caused by heat accumulation. And when the heat-insulating expansion joint is connected to the interface of the external pipeline, it can ensure that the external surface of the heat-insulating expansion joint is flush, which is convenient for installation.

[0007] In some embodiments, the lining pipe includes an outer sleeve and an inner sleeve that are slidably sleeved with each other. One of the adjacent two flange plates is connected to the outer sleeve, and the other of the adjacent two flange plates is connected to the inner sleeve.

[0008] In some embodiments, the lining pipe further includes a sealing ring, and the sealing ring is arranged at the connection between the outer sleeve and the inner sleeve.

[0009] In some embodiments, heat insulation coatings are provided on the inner walls of the outer sleeve and the inner sleeve;

[0010] and / or, the thickness of the folded edge is set to be 1 mm to 5 mm;

[0011] and / or, the folded edge is connected to the flange by welding.

[0012] In some embodiments, the heat insulation layer is made of a flexible heat insulation material.

[0013] In some embodiments, a plurality of hooks are provided on the inner lining pipe, and the hooks have hook portions, and the hook portions are arranged in the heat insulation layer.

[0014] In some embodiments, a plurality of connection holes are provided on the flange, and the heat insulation expansion joint further includes a plurality of connection screws, the connection screws are inserted into the connection holes of the flange, and the connection screws are connected to the flange by nuts.

[0015] In some embodiments, the connection screw includes a first connecting rod, a second connecting rod and a positioning pin. A guiding cavity is provided in the first connecting rod, at least a part of the second connecting rod is inserted into the guiding cavity, a plurality of positioning holes are provided on the first connecting rod, an installation hole is provided on the second connecting rod, and the positioning pin is inserted into the installation hole and the positioning hole.

[0016] In some embodiments, the connection screw further includes an elastic member, the elastic member is connected between the first connecting rod and the second connecting rod, and when the second connecting rod moves towards the inside of the guiding cavity, the elastic deformation of the elastic member increases.

[0017] In some embodiments, the number of the connection screws is set to be 4, and the 4 connection screws are evenly spaced around the axis of the corrugated pipe and arranged outside the flange. Description of the Drawings

[0018] Figure 1 is a three-dimensional schematic diagram of a heat insulation expansion joint provided by an embodiment of the present invention.

[0019] Figure 2 is a combined schematic diagram of a heat insulation expansion joint provided by an embodiment of the present invention.

[0020] Figure 3 is Figure 2 a partial enlarged view of the position A in the heat insulation expansion joint shown in

[0021] Figure 4 is Figure 2 a partial enlarged view of the position B in the heat insulation expansion joint shown in

[0022] Figure 5 This is a schematic diagram of the internal structure of a heat-insulating expansion joint provided by an embodiment of the present utility model.

[0023] Figure 6 is Figure 5 A partial enlarged view of the heat-insulating expansion joint shown at C.

[0024] Reference numerals:

[0025] 100, heat-insulating expansion joint; 200, external pipeline; 10, bellows; 11, first end; 12, second end; 20, inner lining tube; 21, folded edge; 22, outer sleeve tube; 23, inner sleeve tube; 24, sealing ring; 25, heat-insulating coating; 26, hook; 261, hook portion; 30, flange; 31, connection hole; 32, ear portion; 33, connection portion; 40, heat-insulating layer; 50, joint surface; 60, connecting screw; 61, first connecting rod; 611, guiding cavity; 612, positioning hole; 62, second connecting rod; 621, mounting hole; 63, positioning pin; 64, elastic member. Detailed implementation manners

[0026] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0027] As Figures 1 to 6 shown, an embodiment of the present utility model provides a heat-insulating expansion joint 100, which includes a bellows 10, an inner lining tube 20 and at least two flanges 30. A heat-insulating layer 40 is provided between the bellows 10 and the inner lining tube 20. The flanges 30 are provided at the ends of the bellows 10. The inner lining tube 20 has a folded edge 21, and the folded edge 21 is connected to the flange 30 and is flush with the flange 30 to form a joint surface 50 for connecting an external pipeline 200. Thus, the heat accumulated at the inner lining tube 20 can be transferred to the flange 30 and then transferred to the outside through the flange 30.

[0028] Specifically, the bellows 10 has a first end 11 and a second end 12 that are oppositely arranged in the length direction. One of the two flanges 30 is provided at the first end 11 of the bellows 10, and the other of the two flanges 30 is provided at the second end 12 of the bellows 10. At least one end of the inner lining tube 20 is provided with a folded edge 21, and the folded edge 21 is tightly connected to the flange 30 and remains flush. Thus, the folded edge 21 can be used as a bridge for heat transfer to ensure that the heat accumulated in the inner lining tube 20 can be smoothly transferred to the flange 30, and then the effective external discharge of heat can be realized, avoiding the occurrence of local external heat phenomenon and reducing the risk of material failure caused by heat accumulation. Among them, the length direction of the bellows 10 is also Figure 1and Figure 2 The vertical direction shown.

[0029] Moreover, in the radial direction of the corrugated pipe 10, the folded edge 21 is located inside the flange 30, so that the folded edge 21 forms a structure similar to the extension of the flange 30, keeping the outer interface of the thermal insulation expansion joint 100 flush and facilitating installation.

[0030] In addition, when the flange 30 is connected to the interface of the external pipeline 200, the folded edge 21 fits with the interface of the external pipeline 200. The folded edge 21 and the flange 30 are only connected through the connection part 33, that is to say, it will not cause large heat loss and the situation of high-temperature failure of the flange 30. Among them, the above-mentioned connection part 33 refers to the connection position between the folded edge 21 and the flange 30.

[0031] In summary, the thermal insulation expansion joint 100 provided by the embodiment of the present utility model sets the folded edge 21 on the inner liner 20, so that the folded edge 21 is connected to the flange 30 and kept flush, and connects the external pipeline 200 through the joint surface 50, which can effectively discharge heat, avoid the occurrence of local external heat phenomenon, and reduce the risk of material failure caused by heat accumulation. And when the thermal insulation expansion joint 100 is connected to the interface of the external pipeline 200, it can ensure that the external interface of the thermal insulation expansion joint 100 is flush, facilitating installation.

[0032] Such as Figure 2 and Figure 3 shown, in this embodiment, folded edges 21 are provided at both ends of the inner liner 20, which can promote the effective transfer and diffusion of heat. Optionally, the folded edge 21 is connected to the flange 30 by welding. Among them, during the welding process, the high-temperature molten solder spreads rapidly and solidifies on the contact surface between the folded edge 21 and the flange 30, forming a firm metallurgical bond. This connection method not only has high strength and high sealing performance, but also can resist various stresses and vibrations that may occur during the operation of the pipeline system, ensuring the long-term stable operation of the thermal insulation expansion joint 100.

[0033] At the same time, the welding connection further improves the heat transfer efficiency. Due to the good thermal conductivity between the solder and the materials of the folded edge 21 and the flange 30, the heat accumulated in the inner liner 20 can be more smoothly transferred to the flange 30 through the folded edge 21, and then quickly dissipated to the surrounding environment through the large heat dissipation surface of the flange 30. This process effectively avoids the accumulation and retention of heat at the connection part 33 between the inner liner 20 and the flange 30, reduces the occurrence of local overheating phenomenon, and improves the heat insulation performance and thermal stability of the entire thermal insulation expansion joint 100. Of course, in some embodiments, the folded edge 21 and the flange 30 can also be connected by bolts, bonding and other methods.

[0034] Further, the thickness of the folding edge 21 can be set to 1 mm to 5 mm, such as 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc., so that while the folding edge 21 can transfer heat, the heat transfer is limited, avoiding excessive temperature of the flange 30 and the corrugated pipe 10 caused by excessive heat transfer, and thus protecting the stability of the external structure.

[0035] As Figure 2 and Figure 4 shown, in some embodiments, the inner lining pipe 20 includes an outer sleeve 22 and an inner sleeve 23 that are slidably sleeved with each other. One of the adjacent two flanges 30 is connected to the outer sleeve 22, and the other of the adjacent two flanges 30 is connected to the inner sleeve 23. That is, at least part of the outer sleeve 22 is sleeved outside the inner sleeve 23, so that there is at least partial overlap between the outer sleeve 22 and the inner sleeve 23, allowing the thermal insulation expansion joint 100 to perform a certain degree of telescopic movement to compensate for the length change caused by temperature change or medium flow.

[0036] Further, the inner lining pipe 20 further includes a sealing ring 24, and the sealing ring 24 is arranged at the connection 33 between the outer sleeve 22 and the inner sleeve 23. That is, the sealing ring 24 can form a tight sealing interface at the connection 33 between the outer sleeve 22 and the inner sleeve 23. When the outer sleeve 22 and the inner sleeve 23 slide relative to each other due to the telescopic movement of the pipeline system, the sealing ring 24 can closely fit on the contact surface of the two, effectively preventing the leakage of the medium through the tiny gap. At the same time, the sealing ring 24 also has a certain compression deformation ability and can generate a certain elastic deformation when subjected to an external force, thereby enhancing the sealing effect. Of course, in some embodiments, the outer sleeve 22 and the inner sleeve 23 can also be sealed by mutual fitting.

[0037] Optionally, the sealing ring 24 can be made of a material with high elasticity, corrosion resistance and high temperature resistance, such as fluororubber, silicone rubber or special alloy, etc. These materials not only have excellent sealing performance, but also can maintain stable physical and chemical properties in extreme environments, thus ensuring the long-term effectiveness and reliability of the sealing ring 24.

[0038] Furthermore, heat insulation coatings 25 are coated on the inner walls of both the outer sleeve 22 and the inner sleeve 23, so that the heat dissipation rate of the internal medium heat of the pipeline to the external environment can be significantly reduced, and the heat insulation performance of the entire pipeline system can be improved.

[0039] In some embodiments, the heat insulation layer 40 is made of a flexible heat insulation material, which can better adapt to the small deformations of the pipeline system under conditions such as temperature change, pressure fluctuation and vibration, closely fit on the outer surfaces of the corrugated pipe 10 and the inner lining pipe 20, form a continuous heat insulation barrier, effectively reduce heat transfer and dissipation, and maintain a stable heat insulation effect.

[0040] Optionally, the flexible thermal insulation material can be set as thermal insulation cotton. The thermal insulation cotton has the characteristics of light weight, softness, easy processing, etc., and can be evenly laid between the corrugated pipe 10 and the inner lining pipe 20.

[0041] Furthermore, as Figure 5 shown, a plurality of hooks 26 are provided on the inner lining pipe. The hook 26 has a hook portion 261, and the hook portion 261 is provided in the thermal insulation layer 40. Specifically, when the thermal insulation layer 40 is laid between the corrugated pipe 10 and the inner lining pipe, the hook portion 261 of the hook 26 will penetrate into the thermal insulation layer 40 material, forming a physical locking effect, which not only ensures the close fit between the thermal insulation layer 40 and the inner lining pipe, but also effectively prevents the thermal insulation layer 40 from shifting or falling off during the operation of the pipeline system.

[0042] Moreover, the setting of the hook 26 also enhances the structural strength of the inner lining pipe. When the pipeline system bears the internal medium pressure or external impact, the hook 26 can serve as an additional support point to disperse and bear part of the stress, thereby protecting the integrity of the inner lining pipe and the entire heat insulation expansion joint 100 structure, making the heat insulation expansion joint 100 more stable and reliable when dealing with complex working conditions.

[0043] In some embodiments, a plurality of connection holes 31 are provided on the flange 30. The heat insulation expansion joint 100 further includes a plurality of connection screws 60. The connection screws 60 are inserted into the connection holes 31 of the flange 30, and the connection screws 60 are connected to the flange 30 through nuts, so as to effectively resist loosening caused by factors such as internal medium pressure, temperature change or external vibration in the pipeline, and maintain the stability of the connection.

[0044] Specifically, a plurality of ears 32 are provided on the flange 30, and the connection holes 31 are provided on the ears 32, which not only provides a stable support for the connection holes 31, but also optimizes the layout of the connection structure, making the entire connection process smoother and more reliable. The connection screw 60 is provided with a threaded section, and the threaded section is inserted into the connection hole 31 and fixed to the flange 30 through a nut.

[0045] As Figure 5 and Figure 6 shown, in some embodiments, the connection screw 60 includes a first connecting rod 61, a second connecting rod 62 and a positioning pin 63. A guiding cavity 611 is provided in the first connecting rod 61. At least part of the second connecting rod 62 is inserted into the guiding cavity 611. A plurality of positioning holes 612 are provided on the first connecting rod 61, and an installation hole 621 is provided on the second connecting rod 62. The positioning pin 63 is inserted into the installation hole 621 and the positioning hole 612, so as to adapt to different connection lengths.

[0046] Among them, a plurality of positioning holes 612 are arranged at intervals along the length direction of the connecting screw 60. The second connecting rod 62 is inserted into the guiding cavity 611. One of the mounting holes 621 and the positioning holes 612 on the first connecting rod 61 corresponds to each other, jointly forming a through-channel for the positioning pin 63, so as to realize the unlocking and locking of the first connecting rod 61 and the second connecting rod 62. When the positioning pin 63 is inserted into the mounting hole 621 and the positioning hole 612 corresponding to the mounting hole 621, the first connecting rod 61 and the second connecting rod 62 are locked; when the positioning hole 612 is pulled out from the mounting hole 621 and the positioning hole 612, the second connecting rod 62 can slide in the guiding cavity 611 to adjust the extension length of the connecting screw 60.

[0047] Furthermore, the connecting screw 60 further includes an elastic member 64. The elastic member 64 is connected between the first connecting rod 61 and the second connecting rod 62. When the second connecting rod 62 moves towards the inside of the guiding cavity 611, the elastic deformation of the elastic member 64 increases. Among them, when the second connecting rod 62 moves towards the inside of the guiding cavity 611, whether it is due to manual adjustment during installation or due to thermal expansion, contraction or vibration in the operation of the pipeline system, etc., the elastic member 64 will undergo corresponding elastic deformation. This deformation not only absorbs part of the impact force and stress generated by the movement, but also enables the connecting screw 60 to make self-adjustment within a certain range to adapt to the minor deformation or displacement of the pipeline system.

[0048] Moreover, as the second connecting rod 62 moves further, the elastic deformation of the elastic member 64 gradually increases. In this process, the elastic member 64 not only provides the necessary elasticity and buffering, but also effectively positions and restricts the second connecting rod 62 through the reaction force generated by its deformation. This positioning and restricting effect, combined with the locking effect of the positioning pin 63, jointly ensures the stability and accuracy of the connecting screw 60 during the connection process.

[0049] In addition, the introduction of the elastic member 64 also makes the disassembly and maintenance of the connecting screw 60 more convenient. When it is necessary to disassemble the connecting screw 60, only the elastic force of the elastic member 64 needs to be overcome to easily pull out the second connecting rod 62 from the guiding cavity 611, without the need to use complex tools or perform cumbersome operations.

[0050] In this embodiment, 4 connecting screws 60 are provided. The 4 connecting screws 60 are evenly arranged at intervals around the axis of the bellows 10 on the outside of the flange 30. Specifically, the uniform distribution of the four connecting screws 60 ensures that the heat insulation expansion joint 100 can receive balanced fastening force during the connection process, avoiding deformation or damage caused by uneven local stress. Secondly, the design of arranging around the axis of the bellows 10 enables the connecting screw 60 to better adapt to the overall structure of the pipeline system, improving the stability and reliability of the connection.

[0051] In addition, the number of the four connecting screws 60 has also been reasonably selected. On the one hand, a sufficient number of connecting screws 60 can ensure the connection strength and tightness, meeting the requirements of the pipeline system for connection performance; on the other hand, an excessive number of connecting screws 60 will increase the complexity of installation and disassembly and reduce work efficiency. Therefore, choosing four connecting screws 60 not only meets the actual needs but also takes into account the convenience of operation.

[0052] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present invention.

[0053] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "couple", "fix", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0056] In the present utility model, terms such as "one embodiment" and "some embodiments" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0057] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present utility model.

Claims

1. A thermal insulation expansion joint, characterized in that: It includes a bellows, an inner liner and at least two flanges, wherein an insulation layer is arranged between the bellows and the inner liner, the flange is arranged at the end of the bellows, the inner liner has a folded edge, the folded edge is connected to the flange, and the folded edge is flush with the flange to form a joint surface, and the joint surface is used to connect an external pipeline.

2. The thermal insulation expansion joint according to claim 1, characterized in that: The inner liner pipe comprises an outer sleeve and an inner sleeve which are slidably connected to each other, one of two adjacent flanges is connected to the outer sleeve, and the other of the two adjacent flanges is connected to the inner sleeve.

3. The thermal insulation expansion joint according to claim 2, characterized in that: The inner liner pipe also includes a sealing ring, which is arranged at the connection between the outer sleeve and the inner sleeve.

4. The thermal insulation expansion joint according to claim 2, characterized in that: The inner walls of the outer sleeve and the inner sleeve are both coated with a heat-insulating coating; And / or, the thickness of the folded edge is set to 1 mm to 5 mm; And / or, the folded edge is connected to the flange by welding.

5. The thermal insulation expansion joint according to claim 1, characterized in that: The heat-insulating layer is made of flexible heat-insulating material.

6. The thermal insulation expansion joint according to claim 5, characterized in that: The inner liner tube is provided with a plurality of hooks, each of which has a hook portion, and the hook portion is arranged in the thermal insulation layer.

7. The thermal insulation expansion joint according to claim 1, characterized in that: The flange is provided with a plurality of connection holes, and the thermal insulation expansion joint further comprises a plurality of connection screws, the connection screws are passed through the connection holes of the flange, and the connection screws are connected to the flange via nuts.

8. The thermal insulation expansion joint according to claim 7, characterized in that: The connecting screw includes a first connecting rod, a second connecting rod and a positioning pin. The first connecting rod is provided with a guide cavity, and at least a portion of the second connecting rod is inserted into the guide cavity. The first connecting rod is provided with a plurality of positioning holes, and the second connecting rod is provided with a mounting hole. The positioning pin is inserted into the mounting hole and the positioning hole.

9. The thermal insulation expansion joint according to claim 8, characterized in that: The connecting screw further includes an elastic member connected between the first connecting rod and the second connecting rod. When the second connecting rod moves toward the guide cavity, the elastic deformation of the elastic member increases.

10. The thermal insulation expansion joint according to claim 7, characterized in that: The number of the connecting screws is 4, and the 4 connecting screws are evenly spaced around the axis of the bellows and arranged on the outer side of the flange.

Images