Thermal insulation pipe protection structure

Abstract

The utility model discloses a kind of heat preservation pipeline heat preservation protection structures, it is related to heat preservation pipeline protection technical field, including corrugated pipe expansion joint main body, composite heat preservation shell subassembly and locking mechanism;The corrugated pipe expansion joint main body includes metal corrugated pipe and the butt flange of two ends integral welding, the metal corrugated pipe is stainless steel material, corrugation number adapts the heat preservation pipeline expansion amount demand connected to its both sides;The metal corrugated pipe inner wall is attached with nitrile rubber sealing layer by epoxy adhesive, the nitrile rubber sealing layer completely covers the wave crest and wave trough of metal corrugated pipe, thickness adapts inner wall sealing demand;The connecting flange of butt flange and pipeline main body is fixed by bolt, and warm sealing gasket is equipped between butt flange and connecting flange;This structure uses metal corrugated pipe to connect adjacent heat preservation pipeline, metal corrugated pipe can absorb pipeline expansion amount, significantly reduce flange bolt stress, prolong sealing gasket life, reduce maintenance frequency.

Description

Technical Field

[0001] This utility model relates to the field of thermal insulation pipeline protection technology, and in particular to a thermal insulation protection structure for thermal insulation pipelines. Background Technology

[0002] Insulated pipes are widely used in heating, water supply, and chemical industries. The traditional connection method for insulated pipes is a direct, rigid connection of the pipe body through flanges. That is, the flanges at the ends of two pipe sections are directly aligned and bolted together, and then a single insulation layer (such as glass wool pipe shell) is wrapped around the outside of the flanges. However, this traditional structure has unavoidable technical defects: expansion and contraction stress leads to flange seal failure. When the temperature of the medium transported in the pipeline changes (such as heating pipes rising from 10℃ to 80℃), the axial expansion and contraction of the pipeline can reach ±30mm. Direct flange connections have no expansion and contraction compensation structure, and all the expansion and contraction stress is concentrated on the flange bolts and sealing gaskets. Long-term use can easily lead to bolt loosening, gasket compression deformation, or aging and cracking, requiring regular maintenance. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the present invention provides a thermal insulation protection structure for thermal insulation pipes.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a thermal insulation protection structure for thermal insulation pipes, including a corrugated pipe expansion joint body, a composite thermal insulation shell assembly, and a locking mechanism.

[0005] The main body of the corrugated pipe expansion joint includes a metal corrugated pipe and integrally welded flanges at both ends. The metal corrugated pipe is made of stainless steel, and the number of corrugations is adapted to the expansion and contraction requirements of the insulated pipes connected on both sides. The inner wall of the metal corrugated pipe is bonded with a nitrile rubber sealing layer through epoxy adhesive. The nitrile rubber sealing layer completely covers the crests and troughs of the metal corrugated pipe, and its thickness is adapted to the sealing requirements of the inner wall. The connecting flange of the pipe body is fixed to the connecting flange of the pipe body by bolts, and a heat-resistant sealing gasket is provided between the connecting flange and the connecting flange.

[0006] The composite insulation shell assembly is composed of two symmetrical semi-cylindrical insulation shells spliced ​​together. Each semi-cylindrical insulation shell has a two-section fitting structure on its inner side. The middle section is an arc-shaped groove that matches the curvature of the outer wall of the metal corrugated pipe, and the two side sections are annular grooves that match the outer diameter of the docking flange and connecting flange. The arc-shaped groove is filled with a water-swellable sealing strip with a high expansion ratio, and the inner wall of the annular groove is glued with a sealing strip. The connection between the two semi-cylindrical insulation shells is provided with a tenon and mortise structure, and the tenon and mortise joint is filled with a sealing strip.

[0007] The locking mechanism includes multiple detachable stainless steel clamps evenly distributed along the axial direction of the composite insulation shell assembly. Styrene-butadiene rubber silicone pads are attached to the inner side of the clamps. The clamps are tightly fitted to the composite insulation shell assembly by adjusting bolts, and their inner diameter is adapted to the outer diameter of the composite insulation shell assembly.

[0008] Furthermore, the semi-cylindrical insulation shell consists of a thin silicone layer, a modified polyurethane foam layer, and an aluminum foil reflective layer from the inside out. This structure can balance flexibility and insulation. The thin silicone layer enhances the fit with the corrugated pipe, the modified polyurethane foam layer ensures the insulation effect, and the aluminum foil reflective layer reduces heat radiation from the external environment. Moreover, the polyurethane layer has no rigid reinforcing ribs, ensuring that it can deform slightly with the corrugated pipe.

[0009] Furthermore, the aluminum foil reflective layer is composited with a modified polyurethane foam layer using hot melt adhesive to ensure that the composite strength meets the usage requirements.

[0010] Furthermore, the water-swellable sealing strip is pre-fixed to the inner wall of the arc-shaped groove with butyl rubber to ensure a tight fit with the outer wall of the metal corrugated pipe.

[0011] Compared with the prior art, the beneficial effects of this utility model are: (1) Use metal corrugated pipes to connect adjacent insulated pipes. The metal corrugated pipes can absorb the expansion and contraction of the pipes, significantly reduce the stress on the flange bolts, extend the life of the sealing gaskets, and reduce the frequency of maintenance. (2) The use of composite insulation shell to cover the corrugated pipe and flange area greatly reduces the heat loss coefficient and can achieve significant energy saving; (3) The use of a nitrile rubber sealing layer (to prevent media leakage), a water-swellable water-stop strip (to prevent moisture penetration), a sealing strip (to prevent heat leakage at splicing), and a silicone pad (to prevent heat leakage from the clamp) provides a quadruple seal, which greatly improves the sealing performance of the insulation pipe connection when used for a long time in a high humidity environment. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the external structure of this utility model; Figure 2 This is a cross-sectional view of the internal structure of this utility model.

[0014] The diagram shows: 1. Metal bellows, 2. Connecting flange, 3. Insulation shell, 4. Water-swellable sealing strip, 5. Sealing strip, 6. Clamp, 7. Insulated pipe body, 8. Connecting flange. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0016] Reference Figure 1-2 This embodiment provides a thermal insulation protection structure for insulated pipes, including a corrugated pipe expansion joint body, a composite thermal insulation shell assembly, and a locking mechanism; The main body of the corrugated pipe expansion joint includes a metal corrugated pipe 1 and a butt flange 2 integrally welded at both ends. The metal corrugated pipe 1 is made of stainless steel, and the number of corrugations is adapted to the expansion and contraction requirements of the insulated pipe body 7 connected on both sides. The inner wall of the metal corrugated pipe 1 is bonded with a nitrile rubber sealing layer by epoxy adhesive. The nitrile rubber sealing layer completely covers the crests and troughs of the metal corrugated pipe, and the thickness is adapted to the sealing requirements of the inner wall. The butt flange 2 is fixed to the connecting flange 8 of the insulated pipe body 7 by bolts, and a heat-resistant sealing gasket is provided between the butt flange 2 and the connecting flange 8.

[0017] The composite insulation shell assembly is composed of two symmetrical semi-cylindrical insulation shells 3 spliced ​​together. Each semi-cylindrical insulation shell 3 has a two-section fitting structure on its inner side. The middle section is an arc-shaped groove that matches the curvature of the outer wall of the metal corrugated pipe 1, and the two side sections are annular grooves that match the outer diameter of the docking flange 2 and the connecting flange 8. The arc-shaped groove is filled with a water-swellable sealing strip 4 with a high expansion ratio, and the inner wall of the annular groove is pasted with EPDM sealing strip 5. The connection between the two semi-cylindrical insulation shells 3 is provided with a mortise and tenon structure, and the mortise and tenon joint is filled with EPDM sealing strip.

[0018] The locking mechanism includes multiple detachable stainless steel clamps 6 evenly distributed along the axial direction of the composite insulation shell assembly. Styrene-butadiene rubber silicone pads are attached to the inner side of the clamps 6. The clamps 6 are tightly fitted to the composite insulation shell assembly by adjusting bolts, and their inner diameter is adapted to the outer diameter of the composite insulation shell assembly.

[0019] In this embodiment, the semi-cylindrical insulation shell 3 consists of, from the inside out, a thin silicone layer of 1-2 mm thickness, a modified polyurethane foam layer of 30-40 mm thickness, and an aluminum foil reflective layer of 0.3-0.5 mm thickness. This structure balances flexibility and insulation. The thin silicone layer enhances the fit with the corrugated pipe, the modified polyurethane foam layer ensures the insulation effect, and the aluminum foil reflective layer reduces heat radiation from the external environment. Furthermore, the polyurethane layer has no rigid reinforcing ribs, ensuring it can deform slightly with the corrugated pipe. The aluminum foil reflective layer is bonded to the modified polyurethane foam layer with hot melt adhesive, ensuring the composite strength meets usage requirements.

[0020] In this embodiment, the water-swellable sealing strip is pre-fixed to the inner wall of the arc-shaped groove by butyl rubber to ensure a tight fit with the outer wall of the metal corrugated pipe.

[0021] This device addresses the problems of leakage, insulation damage, and difficult maintenance caused by traditional direct flange connections in insulated pipes due to expansion and contraction stress. It achieves expansion and contraction adaptation, sealing and insulation, and convenient maintenance through the coordinated operation of a corrugated pipe expansion joint, a composite insulation shell, and a locking mechanism. The corrugated pipe expansion joint is the core component. The stainless steel corrugated pipe elastically deforms with the pipe's thermal expansion and contraction, absorbing the expansion and contraction and preventing bolt loosening and gasket cracking caused by stress concentration in traditional flange connections. Its inner wall nitrile rubber sealing layer covers the crests and troughs of the corrugated pipe, working in conjunction with heat-resistant gaskets between flanges to double-block media leakage. The composite insulation shell adapts to the characteristics of the corrugated pipe. Its inner arc-shaped groove fits the corrugated pipe, and the water-swellable sealing strip expands to seal the gaps and expands synchronously with the corrugated pipe. From the inside out, a thin silicone layer, a modified polyurethane foam layer, and an aluminum foil reflective layer ensure flexible fit and achieve insulation through foam insulation and aluminum foil reflection. The EPDM sealing strip at the joints prevents heat leakage and eliminates insulation breaks. The stainless steel clamps of the locking mechanism are evenly distributed along the insulation shell, while the inner silicone pads compensate for uneven pressure, thus firmly fixing the insulation shell and preventing cracking. The detachable design allows for maintenance without removing the entire insulation layer; simply loosening the bolts is sufficient. With these three elements working together, the corrugated pipe deforms and the insulation shell moves synchronously when the pipeline expands or contracts, ensuring the clamps remain secure. Simultaneously, multiple seals prevent leakage, and the composite layer provides thermal insulation, ultimately achieving stable operation and easy maintenance of the pipeline joint.

[0022] Of course, the above description is not limited to the examples above. Technical features not described in this utility model can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A thermal insulation protection structure for insulated pipes, characterized in that, Includes the corrugated pipe expansion joint body, composite insulation shell assembly, and locking mechanism; The main body of the bellows expansion joint includes a metal bellows (1) and a butt flange (2) integrally welded at both ends; the inner wall of the metal bellows (1) is bonded with a nitrile rubber sealing layer by epoxy adhesive, and the nitrile rubber sealing layer completely covers the crests and troughs of the metal bellows (1); the butt flange (2) is fixed to the connecting flange of the pipe body by bolts, and a heat-resistant sealing gasket is provided between the butt flange and the connecting flange. The composite insulation shell assembly is composed of two symmetrical semi-cylindrical insulation shells (3) spliced ​​together. Each semi-cylindrical insulation shell (3) has a two-section fitting structure on its inner side. The middle section is an arc-shaped groove that matches the curvature of the outer wall of the metal corrugated pipe (1), and the two side sections are annular slots that match the outer diameter of the docking flange (2) and the connecting flange. The arc-shaped groove is filled with a water-swellable water-stop strip (4), and the inner side wall of the annular slot is pasted with a sealing strip (5). The connection between the two semi-cylindrical insulation shells is provided with a mortise and tenon structure, and the mortise and tenon joint is filled with a sealing strip. The locking mechanism includes multiple detachable stainless steel clamps (6) evenly distributed along the axial direction of the composite insulation shell assembly. The inner side of the clamps (6) is pasted with styrene-butadiene rubber silicone pads. The clamps (6) are tightly fitted to the composite insulation shell assembly by adjusting bolts, and the inner diameter is adapted to the outer diameter of the composite insulation shell assembly.

2. The thermal protection structure for a thermal pipe according to claim 1, wherein The semi-cylindrical insulation shell (3) consists of a thin silicone layer, a modified polyurethane foam layer, and an aluminum foil reflective layer from the inside out.

3. The thermal insulation protection structure for insulated pipes according to claim 2, characterized in that, The aluminum foil reflective layer is composited with a modified polyurethane foam layer using hot melt adhesive.

4. The thermal protection structure for a thermal pipe according to claim 1, wherein The water-swellable sealing strip is pre-fixed to the inner wall of the arc-shaped groove by butyl rubber.

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