Cold insulation structure for low-temperature fluid conveying pipeline elbow
By adopting a layered wrapping method, the problems of poor sealing and cold insulation at the elbows of low-temperature fluid transportation pipelines in existing technologies are solved. The layered wrapping cold insulation structure uses cold insulation materials of different densities and stainless steel sheet covering, combined with T-shaped overlaps and expansion and contraction materials, to reduce heat and stabilize the temperature environment at the elbows, thereby improving the system's operating efficiency.
Patent Information
- Application Number
- CN202520372195.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-05
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2035-03-05
AI Technical Summary
Existing cryogenic fluid transport pipelines have poor sealing and cold insulation properties at elbows, and the sealing and cold insulation performance at the joints are easily damaged due to pre-cooling shrinkage and compression.
The insulation structure employs a layered wrapping method, consisting of an inner, middle, and outer insulation layer. Utilizing polyisocyanate material, the inner layer uses materials of varying densities, while the middle and outer layers have moderate densities. Adhesives and moisture-proof materials are used, and the outer layer is covered with stainless steel sheet. T-shaped overlaps and expansion/contraction materials are combined to ensure both airtightness and insulation.
It effectively reduces heat transfer at elbows, copes with expansion and contraction caused by temperature changes and medium pressure fluctuations, ensures that the conveyed medium maintains a stable temperature environment at elbows, and improves system operating efficiency.
Smart Images
Figure CN223635688U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to low temperature fluid conveying pipeline cold insulation technical field, especially relate to the cold insulation structure for low temperature fluid conveying pipeline elbow. BACKGROUND
[0002] In prior art, the heat preservation of low temperature fluid conveying pipeline usually adopts the polyurethane foaming cold insulation mode.
[0003] But in practical application, the cold insulation effect is not good and heat leakage is easy to appear.
[0004] Especially at the elbow of low temperature fluid conveying pipeline, the sealing property and cold insulation property of the joint are damaged due to the adverse effect of precooling shrinkage and extrusion.
[0005] Therefore, how to improve the sealing property and cold insulation property of the elbow of low temperature fluid conveying pipeline becomes a technical problem to be solved by the person skilled in the art. INVENTION CONTENTS
[0006] In view of the above defects of prior art, the utility model provides the cold insulation structure for low temperature fluid conveying pipeline elbow, and the purpose is to improve the sealing property and cold insulation property of the elbow of low temperature fluid conveying pipeline.
[0007] To achieve the above object, the utility model discloses the cold insulation structure for low temperature fluid conveying pipeline elbow, including the inner cold insulation layer, the middle cold insulation layer and the outer cold insulation layer that are curved into arc and are coaxially wrapped in low temperature fluid inner pipe elbow outside from inside to outside in layer by layer.
[0008] The density of the inner cold insulation layer is 350kg / m 3 The above cold insulation material is made.
[0009] The density of the middle cold insulation layer and the outer cold insulation layer is 200kg / m 3 350kg / m 3 The above cold insulation material is made.
[0010] Preferably, the cold insulation material is polyisocyanate material.
[0011] Preferably, the low temperature fluid inner pipe elbow and the inner cold insulation layer, the inner cold insulation layer and the middle cold insulation layer and the middle cold insulation layer and the outer cold insulation layer are all bonded by using adhesive.
[0012] Preferably, the low temperature fluid inner pipe elbow and the inner cold insulation layer and the middle cold insulation layer and the outer cold insulation layer are all provided with moisture-proof layer made of moisture-proof material.
[0013] Preferably, the inner cold insulation layer and the middle cold insulation layer are fixed by pressure sensitive adhesive tape at the straight pipe parts located at both ends of the elbow; and the outer cold insulation layer is covered by stainless steel sheet outside.
[0014] Preferably, the inner cold insulation layer, the middle cold insulation layer and the outer cold insulation layer are connected by T-shaped lap joint between the straight pipe parts located at both ends of the elbow and the straight pipe cold insulation layer of the straight pipe, and buffer material for expansion and contraction is arranged at the joint of the T-shaped lap joint.
[0015] More preferably, the buffer material for expansion and contraction is elastic fiber blanket.
[0016] The utility model discloses the beneficial effects of:
[0017] The utility model discloses the cold insulation structure of elbow can effectively reduce the heat transfer of elbow part, can also effectively cope with the expansion and contraction deformation of pipeline due to temperature change, internal medium pressure fluctuation and other factors, ensure that the conveying medium can still maintain stable temperature environment at the elbow, and further improve the operation efficiency of whole system.
[0018] The utility model discloses the beneficial effects of: DRAWINGS
[0019] Figure 1 The longitudinal section structure schematic diagram of one embodiment of the utility model is shown.
[0020] Figure 2 The cross section structure schematic diagram of one embodiment of the utility model is shown. CONCRETE IMPLEMENTING METHOD
[0021] EMBODIMENT
[0022] As Figure 1 and Figure 2 The cold insulation structure for the elbow of low temperature fluid conveying pipeline, including the inner cold insulation layer 1, the middle cold insulation layer 2 and the outer cold insulation layer 3 that are layered successively from inside to outside and are coaxially wrapped outside the low temperature fluid inner pipe elbow 10 curved into arc shape;
[0023] The inner cold insulation layer 1 is made of cold insulation material with the density of 350kg / m 3 The above.
[0024] The middle cold insulation layer 2 and the outer cold insulation layer 3 are made of cold insulation material with the density of 200kg / m 3 To 350kg / m 3 .
[0025] The utility model discloses a layered wrapping mode realizes the multiple composite of cold insulation material, and each layer plays different roles according to its characteristics.
[0026] Among them, the inner cold insulation layer 1 and the middle cold insulation layer 2 select high-density cold insulation material to reduce heat conduction to the maximum extent and can bear certain downward force; because the external temperature is higher, the middle-density cold insulation material is adopted, and the performance and economy meet the cold insulation demand.
[0027] The utility model discloses a layered wrapping inner cold insulation layer 1, middle cold insulation layer 2 and outer cold insulation layer 3, utilize elbow cold insulation structure, can effectively reduce the heat transfer of elbow position, still can effectively cope with the expansion and contraction deformation of pipeline due to temperature change, internal medium pressure fluctuation and other factors, ensure that the conveying medium still can maintain stable temperature environment at elbow, and further improve the operation efficiency of whole system.
[0028] In some embodiments, the cold insulation material is a polyisocyanate material.
[0029] In some embodiments, the inner cold insulation layer 1, the middle cold insulation layer 2 and the outer cold insulation layer 3 are all made of a cold insulation material.
[0030] In practical application, the adhesive can ensure higher adhesion.
[0031] In some embodiments, the inner cold insulation layer 1 and the middle cold insulation layer 2 are both provided with a moisture-proof layer 4 made of a moisture-proof material.
[0032] In practical application, the inner cold insulation layer 1 and the middle cold insulation layer 2 are both provided with a moisture-proof layer 4 made of a moisture-proof material, which can ensure that condensation caused by low temperature does not affect the performance of the cold insulation material.
[0033] In some embodiments, the inner cold insulation layer 1 and the middle cold insulation layer 2 are both provided with a moisture-proof layer 4 made of a moisture-proof material.
[0034] In practical application, the outer cold insulation layer 3 is coated with a stainless steel sheet 6, which can have good corrosion resistance and be more firm and less likely to fall off.
[0035] In some embodiments, the inner cold insulation layer 1, the middle cold insulation layer 2 and the outer cold insulation layer 3 are all connected to the straight pipe cold insulation layer of the straight pipe through T-shaped lap joints, and the T-shaped lap joints are all provided with expansion and contraction buffer materials 7.
[0036] In practical application, the inner cold-keeping layer 1, the middle cold-keeping layer 2 and the outer cold-keeping layer 3 are connected with the straight pipe cold-keeping layer of the straight pipe at the straight pipe parts located at both ends of the elbow through T-shaped lap joint connection, and the expansion and contraction buffer material 7 is arranged at the joint of the T-shaped lap joint, so that when the inner cold-keeping layer 1, the middle cold-keeping layer 2 and the outer cold-keeping layer 3 shrink in the precooling process, no gap is caused by the shrinkage, and cold air leakage is avoided, and the cold-keeping effect is not affected.
[0037] In some embodiments, the expansion and contraction buffer material is an elastic fiber blanket.
[0038] The elastic fiber blanket has good elasticity and flexibility, can be deformed correspondingly with the shrinkage of the cold-keeping material, tightly fills the gap caused by the shrinkage, effectively prevents the adverse effects caused by the precooling shrinkage extrusion in the prior art, and ensures that the joint always maintains good sealing performance and cold-keeping performance.
[0039] The above describes the preferred embodiments of the utility model in detail. It should be understood that those skilled in the art can make many modifications and changes according to the conception of the utility model without creative labor. Therefore, any technical scheme obtained by logical analysis, reasoning or limited experiment on the basis of the prior art according to the conception of the utility model should be within the protection scope defined by the claims.
Claims
1. Cold-insulation structure for a bend of a pipeline for cryogenic fluid; characterized in that, The inner cold-keeping layer (1), the middle cold-keeping layer (2) and the outer cold-keeping layer (3) are coaxially wrapped outside the low-temperature fluid inner tube elbow (10) in sequence from inside to outside. The inner cold insulation layer (1) is made of a cold insulation material with a density of 350 kg / m 3 made of the above cold insulation material; The intermediate cold insulation layer (2) and the outer cold insulation layer (3) are made of cold insulation material with a density of 200 kg / m 3 to 350 kg / m 3 .
2. The cold-insulating structure for a bend of a cryogenic fluid transfer line according to claim 1, characterized by, The cold-keeping material is a polyisocyanate material.
3. The cold retaining structure for a bend of a cryogenic fluid transfer line according to claim 1, characterized by, The low-temperature fluid inner tube elbow (10) and the inner cold-keeping layer (1), the inner cold-keeping layer (1) and the middle cold-keeping layer (2), and the middle cold-keeping layer (2) and the outer cold-keeping layer (3) are all adhered by using an adhesive.
4. The cold retaining structure for a bend of a cryogenic fluid transfer line according to claim 1, characterized by, The low-temperature fluid inner tube elbow (10) and the inner cold-keeping layer (1), and the middle cold-keeping layer (2) and the outer cold-keeping layer (3) are both provided with a moisture-proof layer (4) made of moisture-proof material.
5. The cold retaining structure for a bend of a cryogenic fluid transfer pipe according to Claim 1, wherein The inner cold-keeping layer (1) and the middle cold-keeping layer (2) are both fixed by using a pressure-sensitive adhesive tape (8) at the straight tube parts at both ends of the elbow position; the outer cold-keeping layer (3) is covered by a stainless steel sheet (6) outside.
6. The cold retaining structure for a bend of a cryogenic fluid delivery pipe according to Claim 1, wherein The inner cold-keeping layer (1), the middle cold-keeping layer (2) and the outer cold-keeping layer (3) are all connected by T-shaped lap joints with the straight tube cold-keeping layer at the straight tube parts at both ends of the elbow position, and the joints of the T-shaped lap joints are all provided with expansion and contraction buffer materials (7).
7. A cold retaining structure for a bend of a cryogenic fluid transfer pipe according to claim 6, characterized by The expansion and contraction buffer material is an elastic fiber blanket.