Heat-insulating pipeline interface protection heat-insulating structure and its construction method

Abstract

The heat-insulating pipeline interface protection and heat-insulating structure of the present invention and its construction method include an interface heat-insulating material and an interface elastic sleeve. The left end of the interface elastic sleeve is sleeved on the surface of the left outer protective pipe. The inner diameter of the left port of the interface elastic sleeve is less than or equal to the outer diameter of the left outer protective pipe of the left heat-insulating pipe. The right end of the interface elastic sleeve is sleeved on the surface of the right outer protective pipe. The inner diameter of the right port of the interface elastic sleeve is less than or equal to the outer diameter of the right outer protective pipe of the right heat-insulating pipe. A closed cavity is formed between the interface elastic sleeve and the right end face of the left heat-insulating pipe, the outer wall of the left pipe body of the left heat-insulating pipe, and the left end face of the right heat-insulating pipe. The interface heat-insulating material is filled in the closed cavity. The heat-insulating pipeline interface protection and heat-insulating structure of the present invention realizes the functions of effectively sealing and heat-insulating protection for the heat-insulating pipeline interface through the interface elastic sleeve, and at the same time, its installation is simple.

Description

Technical Field

[0001] The present invention relates to a thermal insulation structure, and particularly to a thermal insulation structure for a pipeline interface. Background Art

[0002] Insulated pipelines are widely used in fields such as hot spring water transportation, cold water insulation, industrial waste heat transfer, and urban central heating. Especially for socket-type flexible interface insulated pipelines, they have unique advantages in installation, construction, etc. However, the outer diameter of the base material in the interface area of the socket-type insulated pipeline is significantly higher than that of the straight pipe position, and there are several major problems in interface thermal insulation; First: Using commercially available heat shrinkable tapes for interface protection has a large installation difficulty, and it is impossible to ensure complete isolation between the internal thermal insulation layer of the pipeline and the soil. Water in the soil will enter the interface area and the pipeline thermal insulation layer. Second: When using a flat electrofusion sleeve for electrofusion, the installation is difficult, and the thickness of the thermal insulation layer in the interface area is relatively low. In the case of long-term operation, the PE electrofusion sleeve will accelerate aging and failure under high-temperature conditions. Third: Using a heat shrinkable tape to thermally shrink the pipeline port for thermal shrinkage port insulation and sealing, but under high-temperature conditions, the hot melt adhesive on the heat shrinkable tape softens, and the heat shrinkable tape fails rapidly in the short term, unable to achieve long-term heat supply protection stability. Fourth: There will be water seepage at the pipeline interface during the operation of the flexible interface. All of the above problems will cause water to enter the thermal insulation layer in the interface area and then into the pipeline thermal insulation layer, resulting in carbonization failure of the thermal insulation layer, destruction of the closed pores of the polyurethane foam, loss of thermal insulation effect, and at the same time, the thermal insulation layer will decompose, generating acid radicals that cause accelerated corrosion of the pipeline.

[0003] The patent with the authorization publication number CN211398955U discloses a seamless waterproof thermal insulation joint, which uses an electrofusion type to heat melt the PE sleeve to the outer protective pipes at both ends of the insulated pipe interface. The dimensional accuracy requirements of the PE sleeve are high, it requires power supply during the electrofusion process, which is time-consuming and has a large installation difficulty, and the local electrofusion effect is not good, and the leakage rate is extremely high. During the operation of the pipeline, expansion and elongation will occur, resulting in local friction with the soil and local damage. For this structure applied to the interface of a ductile iron pipe with protrusions, it will cause the thinning of the thermal insulation layer at the interface, accelerate the local aging speed, and reduce the pipeline operation life.

[0004] The patent with the authorization publication number CN201302016Y discloses a submarine pipeline waterproof thermal insulation sealing joint, which uses an anti-corrosion heat shrinkable layer to waterproof and seal the port of the insulated pipe. During the actual operation of the heat supply pipeline, the hot melt adhesive of the heat shrinkable layer melts and fails. When water in the soil or joint seepage occurs, it will directly cause water to enter the thermal insulation layer and damage the thermal insulation.

[0005] In summary, there is currently no suitable interface thermal insulation structure that can meet the requirements of easy installation during construction and can effectively seal and thermally insulate the interface of the insulated pipeline during use. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a heat-insulating pipeline interface protection and heat-insulating structure that is simple to install and can effectively seal and protect the heat-insulating pipeline interface.

[0007] The heat-insulating pipeline interface protection and heat-insulating structure of the present invention includes an interface heat-insulating material and an interface elastic sleeve. The left end of the interface elastic sleeve is sleeved on the outer surface of the left outer protection pipe of the left heat-insulating pipe at the heat-insulating pipeline interface. The inner diameter of the left port of the interface elastic sleeve is less than or equal to the outer diameter of the left outer protection pipe of the left heat-insulating pipe. The right end of the interface elastic sleeve is sleeved on the outer surface of the right outer protection pipe of the right heat-insulating pipe at the heat-insulating pipeline interface. The inner diameter of the right port of the interface elastic sleeve is less than or equal to the outer diameter of the right outer protection pipe of the right heat-insulating pipe. A closed cavity is formed between the interface elastic sleeve and the right end face of the left heat-insulating pipe, the outer wall of the left pipe body of the left heat-insulating pipe, and the left end face of the right heat-insulating pipe. The interface heat-insulating material is filled in the closed cavity.

[0008] The heat-insulating pipeline interface protection and heat-insulating structure of the present invention further includes a left waterproof sleeve and / or a right waterproof sleeve. The left waterproof sleeve is used to separate the left heat-insulating layer of the left heat-insulating pipe from the interface heat-insulating material, and the right protection sleeve is used to separate the right heat-insulating layer of the right heat-insulating pipe from the interface heat-insulating material.

[0009] The heat-insulating pipeline interface protection and heat-insulating structure of the present invention, wherein the left waterproof sleeve includes a left sealing sleeve sleeved on the outer wall of the left pipe body of the left heat-insulating pipe. The left end of the left sealing sleeve is provided with a left flange layer integrally formed therewith. The outermost side of the left flange layer extends outward to the interface elastic sleeve and is integrally formed and connected with the interface elastic sleeve. The right protection sleeve includes an inner sealing sleeve sleeved on the outer wall of the right pipe body and an outer sealing sleeve sleeved on the outer wall of the left end of the right outer protection pipe. The right end face of the inner sealing sleeve is integrally formed and connected with the left end face of the outer sealing sleeve through a right flange layer. The right flange layer is closely attached to the left end face of the right heat-insulating layer. The right end of the interface elastic sleeve is wrapped around the outer periphery of the outer sealing sleeve.

[0010] The heat-insulating pipeline interface protection and heat-insulating structure of the present invention, wherein the interface heat-insulating material includes a prefabricated heat-insulating material wrapped around the outer wall of the left pipe body of the left heat-insulating pipe and a filling type heat-insulating material filled outside the prefabricated heat-insulating material.

[0011] The heat-insulating pipeline interface protection and heat-insulating structure of the present invention, wherein the left end of the interface elastic sleeve is fixed on the left outer protection pipe of the left heat-insulating pipe through a left tightening device or sealant, and the right end of the interface elastic sleeve is fixed on the outer surface of the right outer protection pipe of the right heat-insulating pipe through a right tightening device or sealant.

[0012] The heat-insulating pipeline interface protection and heat-insulating structure of the present invention, wherein waterlines for enhancing the sealing effect are respectively provided on the inner walls of the left and right ports of the interface elastic sleeve.

[0013] For the thermal insulation pipeline interface protection and thermal insulation structure of the present invention, the right end of the interface elastic sleeve is sleeved on the right outer protection pipe of the socket section of the right thermal insulation pipe.

[0014] For the thermal insulation pipeline interface protection and thermal insulation structure of the present invention, the right end of the interface elastic sleeve is sleeved on the right outer protection pipe of the horizontal section of the right thermal insulation pipe.

[0015] For the thermal insulation pipeline interface protection and thermal insulation structure of the present invention, the longitudinal section of the middle part of the interface elastic sleeve for wrapping the interface thermal insulation material is one of rectangular, conical, elliptical, circular or other combined special-shaped structures.

[0016] For the thermal insulation pipeline interface protection and thermal insulation structure of the present invention, two middle tightening devices are symmetrically arranged on the left and right of the middle part of the interface elastic sleeve.

[0017] Construction method of using the thermal insulation pipeline interface protection and thermal insulation structure of the present invention

[0018] S1: Clean the port thermal insulation layer, the surface of the outer protection pipe, and the outer walls of the socket and spigot bases at the interfaces of the left and right thermal insulation pipelines to make the surfaces flat without oil stains and impurities.

[0019] S2: Sleeve the left port of the interface protection elastic sleeve on the left outer protection pipe of the left thermal insulation pipe. At the same time, sleeve the left waterproof sleeve integrally formed with the protection elastic sleeve on the left pipe body, so that the left flange layer of the left waterproof sleeve is closely attached to the end face of the left thermal insulation layer of the left thermal insulation pipe. Then turn the right end of the interface protection elastic sleeve up to the outer circumference of its left end.

[0020] S3: Sleeve the inner sealing sleeve of the right waterproof sleeve on the socket base of the right thermal insulation pipe. At the same time, sleeve the outer sealing sleeve of the right waterproof sleeve on the left end of the right outer protection pipe, so that the right flange layer of the right waterproof sleeve is closely attached to the right thermal insulation layer of the right thermal insulation pipe.

[0021] S4: Install the spigot of the left thermal insulation pipe into the socket of the right thermal insulation pipe. After the thermal insulation pipeline is connected in place, wind the preformed thermal insulation material on the outer wall of the left pipe body at the interface of the thermal insulation pipeline and on the left sealing sleeve of the left waterproof sleeve. Then turn the right end of the interface elastic sleeve down to wrap on the outer sealing sleeve on the outer wall of the right outer protection pipe.

[0022] S5: Fix the left and right ends of the interface elastic sleeve on the left and right outer protection pipes respectively through the left and right tightening devices or sealant.

[0023] S6: Open a filling hole on the interface elastic sleeve, and conduct an airtightness test on the sealed cavity wrapped by the interface elastic sleeve through the filling hole.

[0024] S7: After the airtightness test shows no problem, an air vent is opened on the interface elastic sleeve, and then the filled and formed thermal insulation material is injected into the cavity through the injection hole until the cavity space is filled with the filled and formed thermal insulation material, forming a combined body with the pre-formed thermal insulation material.

[0025] S8: Seal the injection hole and the air vent.

[0026] The thermal insulation pipeline interface protection and thermal insulation structure of the present invention effectively isolates the thermal insulation pipeline interface from the external soil through the interface elastic sleeve, realizing the functions of effectively sealing and thermally insulating the thermal insulation pipeline interface. At the same time, its installation is simple, solving the problems of complex installation and easy damage to the stability protection layer in the prior art.

[0027] The thermal insulation pipeline interface protection and thermal insulation structure of the present invention can effectively prevent the moisture in the soil from penetrating into the thermal insulation layers of the left and right thermal insulation pipes due to the breakage of the interface elastic sleeve through the left waterproof sleeve and the right waterproof sleeve; at the same time, it can also effectively prevent the water from penetrating into the thermal insulation layers of the left and right thermal insulation pipes due to the water seepage of the interface base body. The left waterproof sleeve and the right waterproof sleeve can effectively protect the thermal insulation layers of the thermal insulation pipes, increasing the service life of the thermal insulation layers of the thermal insulation pipes.

[0028] The following further illustrates the thermal insulation pipeline interface protection and thermal insulation structure of the present invention with reference to the drawings. Description of the Drawings

[0029] Figure 1 Schematic diagram of the thermal insulation pipeline interface protection and thermal insulation structure of the present invention in Example 1 installed at the pipeline interface;

[0030] Figure 2 Schematic diagram of the thermal insulation pipeline interface protection and thermal insulation structure of the present invention in Example 2 installed at the pipeline interface;

[0031] Figure 3 Schematic diagram of the structure after the interface elastic sleeve and the left waterproof sleeve are integrally formed in Example 2;

[0032] Figure 4 Schematic diagram of the mechanism of the right waterproof sleeve in Example 2:

[0033] Figure 5 Schematic diagram of the thermal insulation pipeline interface protection and thermal insulation structure of the present invention in Example 3 installed at the pipeline interface;

[0034] Figure 6 Schematic diagram of the structure after the interface elastic sleeve and the left waterproof sleeve are integrally formed in Example 3. Detailed Embodiments

[0035] Example 1, as Figure 1As shown in the figure, the heat-insulating pipeline interface protection and heat-insulating structure of the present invention is used for heat-insulating pipelines processed by the winding process. When the left heat-insulating pipe 5 is connected to the right heat-insulating pipe 6, the right-end socket base of the left heat-insulating pipe 5 is inserted into the socket base with a sealing component at the left end of the right heat-insulating pipe 6, so that the left pipe body 50 in the left heat-insulating pipe 5 is hermetically connected to the right pipe body 60 in the right heat-insulating pipe 6. After the two heat-insulating pipes are connected together, a heat-insulating pipeline interface is formed. The left end face of the heat-insulating layer of the right heat-insulating pipeline processed by the winding process extends above its socket base. The heat-insulating pipeline interface protection and heat-insulating structure of the present invention includes interface heat-insulating materials, an interface elastic sleeve 2, a left tightening device 3 and a right tightening device 4. The interface elastic sleeve 2 is made of an elastic material, and elastic materials such as rubber can be selected. The left end of the interface elastic sleeve 2 is sleeved on the surface of the left outer protection pipe 51 of the left heat-insulating pipe 5 at the heat-insulating pipeline interface, and the inner diameter of the left port of the interface elastic sleeve 2 is less than or equal to the outer diameter of the left outer protection pipe 51 of the left heat-insulating pipe 5. The left tightening device 3 tightens the left end of the interface elastic sleeve 2 on the left outer protection pipe 51 of the left heat-insulating pipe 5. The right end of the interface elastic sleeve 2 is sleeved on the surface of the right outer protection pipe 61 of the socket section of the right heat-insulating pipe 6 at the heat-insulating pipeline interface, and the inner diameter of the right port of the interface elastic sleeve 2 is less than or equal to the outer diameter of the right outer protection pipe 61 of the right heat-insulating pipe 6. The right tightening device 4 tightens the right end of the interface elastic sleeve 2 on the surface of the right outer protection pipe 61 of the right heat-insulating pipe 5. Waterlines 21 (refer to Figure 2 ) for enhancing the sealing effect are respectively provided on the inner walls of the left and right ports of the interface elastic sleeve 2. In this embodiment, the left tightening device 3 and the right tightening device 4 can also be replaced by sealant, that is, the left port of the interface elastic sleeve 2 is fixed on the left outer protection pipe 51 by sealant, and the right port of the interface elastic sleeve 2 is fixed on the surface of the outer protection pipe 61 by sealant. A closed cavity is formed between the right end face of the interface elastic sleeve 2 and the left heat-insulating pipe 5, the outer wall of the left pipe body 50 of the left heat-insulating pipe and the left end face of the right heat-insulating pipe 6. The interface heat-insulating materials are filled in the closed cavity, which can effectively insulate the pipeline interface. The left and right ports of the interface elastic sleeve 2 are respectively tightly sleeved on the left and right outer protection pipes 51, 61 at the pipeline interface, which can effectively isolate the heat-insulating pipeline interface from the external soil, prevent the moisture in the soil from entering the heat-insulating layer of the heat-insulating pipeline through the heat-insulating pipeline interface, effectively protect the heat-insulating layer. At the same time, compared with the prior art, the installation of the interface elastic sleeve 2 is simple, without using electrofusion or open fire baking, improving the effectiveness and safety of the construction of the heat-insulating pipeline interface. The heat-insulating pipeline interface is prone to telescopic deformation during heating and also bears the pressure of the outer soil. The left and right tightening devices 3, 4 can ensure that the left and right ports of the interface elastic sleeve 2 are firmly sleeved on the outer protection pipes of the left and right heat-insulating pipes 5, 6 to prevent it from detaching from the outer protection pipe when stressed. The left and right tightening devices 3, 4 can be any one of a tightening belt, a metal clamp, a plastic clamp, etc., and the material can be a metal or non-metal material that provides a pressing force.

[0036] The interface thermal insulation material can be any one of a filled thermal insulation material, a prefabricated thermal insulation material, or a combination of a filled thermal insulation material and a prefabricated thermal insulation material. In this embodiment, the interface thermal insulation material is selected as a combination of a filled thermal insulation material and a prefabricated thermal insulation material, which includes a prefabricated thermal insulation material 11 wrapped around the outer wall of the left tube body 50 of the left thermal insulation pipe 5 and a filled thermal insulation material 12 filled outside the prefabricated thermal insulation material 11. The prefabricated thermal insulation material 11 can be spirally wound around the left tube body 50 of the left thermal insulation pipe 5 or tied to the left tube body 50. The filled thermal insulation material 12 is injected into the cavity through the injection hole opened on the interface elastic sleeve 2, and the thermal insulation is achieved by the self-expansion and foaming of the thermal insulation material itself. The combination of the filled thermal insulation material and the prefabricated thermal insulation material can greatly improve the thermal insulation performance of the thermal insulation pipe interface.

[0037] The construction method of the thermal insulation pipe interface protection and thermal insulation structure of the present invention is as follows:

[0038] S1: Clean the port thermal insulation layer, the outer surface of the outer protection pipe, and the outer walls of the socket and spigot bases at the interfaces of the left and right thermal insulation pipes to make the surface flat without oil stains and impurities.

[0039] S2: Put the left port of the interface protection elastic sleeve 2 on the left outer protection pipe 51 of the left thermal insulation pipe 5, and turn the right end of the interface protection elastic sleeve 2 up to the outer periphery of its left end.

[0040] S3: Install the spigot of the left thermal insulation pipe 5 into the socket of the right thermal insulation pipe 6. After the thermal insulation pipes are connected in place, wind the prefabricated thermal insulation material 11 around the outer wall of the left tube body 50 at the interface of the thermal insulation pipes, and then turn the right end of the interface elastic sleeve 2 down to the outer wall of the right outer protection pipe 61 of the right thermal insulation pipe 6 located outside the socket base.

[0041] S4: Fix the left and right ends of the interface elastic sleeve 2 on the left and right outer protection pipes 51 and 61 respectively through the left and right tightening devices 3 and 4 or sealant.

[0042] S5: Open an injection hole on the interface elastic sleeve 2, and conduct an airtightness test on the sealed cavity wrapped by the interface elastic sleeve 2 through the injection hole.

[0043] S6: After the airtightness test is okay, open an air outlet hole on the interface elastic sleeve 2, and then inject the filled and formed thermal insulation material 12 into the cavity through the injection hole until the filled and formed thermal insulation material fills the cavity space and forms a combination with the prefabricated thermal insulation material 11.

[0044] The heat-insulating pipeline interface protection and heat-insulating structure of the present invention solves the problems of heat insulation and protection at the interface of heat-insulating pipelines processed by winding technology. The interface elastic sleeve effectively separates the interface of the heat-insulating pipeline from the external soil completely, realizing the functions of effective sealing and heat-insulating protection for the interface of the heat-insulating pipeline. At the same time, its installation is simple, solving the problems of complex installation and easy damage to the heat-insulating layer in the prior art.

[0045] Embodiment 2, as Figure 2 and Figure 3 shown, the difference between the heat-insulating pipeline interface protection and heat-insulating structure of the present invention and Embodiment 1 is that: the left heat-insulating layer 52 of the left heat-insulating pipe 5 and the interface heat-insulating material are separated by the left waterproof sleeve 7, and the left waterproof sleeve 7 and the interface elastic sleeve 2 are integrally formed. The left waterproof sleeve 7 includes a left sealing sleeve 71 sleeved on the outer wall of the left pipe body 50 of the left heat-insulating pipe 5. The left end of the left sealing sleeve 71 is provided with a left flange layer 72 integrally formed therewith. The outermost side of the left flange layer 72 extends outward to the interface elastic sleeve 2 and is integrally formed and connected with the interface elastic sleeve 2; between the right heat-insulating layer 62 of the right heat-insulating pipe 6 and the interface heat-insulating material and between the right outer protection pipe 61 and the interface elastic sleeve 2 are separated by the right protection sleeve 8, and the right protection sleeve 8 and the interface elastic sleeve 2 are made of the same material. The right protection sleeve 8 includes an inner sealing sleeve 81 sleeved on the outer wall of the right pipe body 60 of the right heat-insulating pipe 6 and an outer sealing sleeve 82 sleeved on the outer wall of the left end of the right outer protection pipe 61. The right end face of the inner sealing sleeve 81 is integrally formed and connected with the left end face of the outer sealing sleeve 82 through a right flange layer 83. The right flange layer 83 is closely attached to the left end face of the right heat-insulating layer 62, and the outer sealing sleeve 82 at the right end of the interface elastic sleeve 2 is wrapped inside and completely covered. The right tightening device 4 is sleeved on the overlapping position of the interface elastic sleeve 2 and the right flange layer 82 to prevent the right flange layer 82 from moving when stressed. When the heat-insulating pipeline interface protection and heat-insulating structure of the present invention is actually used on site, according to the on-site conditions of the heat-insulating pipeline, sometimes only the left waterproof sleeve 7 or the right waterproof sleeve 8 needs to be used for waterproof protection.

[0046] The installation and construction method of the heat-insulating pipeline interface protection and heat-insulating structure of the present invention is as follows:

[0047] S1: Clean the port heat-insulating layer, the surface layer of the outer protection pipe, and the outer walls of the socket and spigot bases at the interfaces of the left and right heat-insulating pipelines to make the surface flat without oil stains and impurities.

[0048] S2: Sleeve the left port of the interface protection elastic sleeve 2 on the left outer protection pipe 51 of the left heat-insulating pipe 5. At the same time, sleeve the left waterproof sleeve 7 integrally formed with the protection elastic sleeve 2 on the left pipe body 50, so that the left flange layer 72 of the left waterproof sleeve 7 is closely attached to the end face of the left heat-insulating layer 52 of the left heat-insulating pipe 5. Then turn up the right end of the interface protection elastic sleeve 2 to the outer circumference of its left end.

[0049] S3: Slip the inner sealing sleeve 81 of the right waterproof sleeve 8 onto the socket base of the right heat preservation pipe 6. At the same time, slip the outer sealing sleeve 82 of the right waterproof sleeve 8 onto the left end of the right outer protection pipe 61, so that the right flange layer 83 of the right waterproof sleeve 8 is closely attached to the right heat preservation layer 62 of the right heat preservation pipe 6.

[0050] S4: Install the socket of the left heat preservation pipe 5 into the socket of the right heat preservation pipe 6. After the heat preservation pipeline connection is in place, wind the preformed heat preservation material 11 on the outer wall of the left pipe body 50 at the interface of the heat preservation pipeline and on the left sealing sleeve 71 of the left waterproof sleeve 7. Then turn down the right end of the interface elastic sleeve 2 to wrap it on the outer sealing sleeve 82 on the outer wall of the right outer protection pipe 61.

[0051] S5: Fix the left and right ends of the interface elastic sleeve 2 to the left and right outer protection pipes 51 and 61 respectively through the left and right tightening devices 3 and 4 or sealant.

[0052] S6: Open a material injection hole on the interface elastic sleeve 2, and conduct an airtightness test on the sealed cavity wrapped by the interface elastic sleeve 2 through the material injection hole.

[0053] S7: After there is no problem with the airtightness test, open an air outlet hole on the interface elastic sleeve 2, and then inject the filled and formed heat preservation material 12 into the cavity through the material injection hole until the filled and formed heat preservation material fills the cavity space and forms a combination with the preformed heat preservation material 11.

[0054] S8: Plug the material injection hole and the air outlet hole.

[0055] The difference in the use effect of the heat preservation pipeline interface protection and heat preservation structure of the present invention from that of the first embodiment is that: the left waterproof sleeve 7 and the right waterproof sleeve 8 can effectively prevent the moisture in the soil from penetrating into the heat preservation layers of the left and right heat preservation pipes 5 and 6 due to the damage of the interface elastic sleeve 2; at the same time, it can also effectively prevent the water from penetrating into the heat preservation layers of the left and right heat preservation pipes 5 and 6 due to the water seepage of the interface base. The left waterproof sleeve 7 and the right waterproof sleeve 8 can effectively protect the heat preservation layers of the heat preservation pipes and increase the service life of the heat preservation layers of the heat preservation pipes.

[0056] Example three, as Figure 4 and Figure 5As shown in the figure, the thermal insulation pipeline interface protection and thermal insulation structure of the present invention is for the thermal insulation pipeline processed by the pipe-in-pipe process. The outer diameter of the thermal insulation layer outside the socket matrix is the same as that of the thermal insulation layer on its horizontal pipe matrix. Therefore, the difference between the thermal insulation pipeline interface protection and thermal insulation structure of the present invention and that of the second embodiment is that the length of the middle part of the interface elastic sleeve 2 wrapping the thermal insulation material 1 is lengthened, and the length of the thermal insulation material 1 is also lengthened accordingly. The right port of the interface elastic sleeve 2 is sleeved on the right outer protection pipe 61 of the horizontal section of the right thermal insulation pipe 6. In this embodiment, the longitudinal section of the middle part of the interface elastic sleeve 2 for wrapping the interface thermal insulation material is rectangular, and two middle tightening devices 9 are symmetrically arranged on the left and right of the middle part of the interface elastic sleeve 2 to ensure that it is tightly wrapped with the thermal insulation material 1. The longitudinal section of the middle part of the interface elastic sleeve 2 for wrapping the interface thermal insulation material can also be selected from one of a conical shape, an elliptical shape, a circular shape or other combined special-shaped structures.

[0057] The difference in the installation and construction method of the thermal insulation pipeline interface protection and thermal insulation structure of the present invention from that of the second embodiment lies in the installation step of S3, which is specifically as follows:

[0058] S3: The inner sealing sleeve 81 of the right waterproof sleeve 8 is sleeved on the right outer protection pipe 61 of the horizontal section of the right thermal insulation pipe 6, and at the same time, the outer sealing sleeve 82 of the right waterproof sleeve 8 is sleeved on the left end of the right outer protection pipe 61, so that the right flange layer 83 of the waterproof sleeve 8 is closely attached to the thermal insulation layer of the right thermal insulation pipe 6.

[0059] The thermal insulation pipeline interface protection and thermal insulation structure of the present invention solves the problems of thermal insulation and protection at the interface of the thermal insulation pipeline processed by the pipe-in-pipe process. Through the interface elastic sleeve, the interface of the thermal insulation pipeline is effectively separated from the external soil completely, realizing the functions of effective sealing and thermal insulation protection for the interface of the thermal insulation pipeline; through the left waterproof sleeve and the right waterproof sleeve, the thermal insulation layer of the thermal insulation pipe can be effectively protected, increasing the service life of the thermal insulation layer of the thermal insulation pipe; at the same time, its installation is simple, solving the problems of complex installation and easy damage to the thermal insulation layer in the prior art.

[0060] The above embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A thermal insulation structure for protecting the interface of a thermal insulation pipeline, characterized in that: It includes an interface thermal insulation material and an interface elastic sleeve (2). The left end of the interface elastic sleeve (2) is sleeved on the surface of the left outer protection pipe (51) of the left thermal insulation pipe (5) at the interface of the thermal insulation pipeline. The inner diameter of the left port of the interface elastic sleeve (2) is less than or equal to the outer diameter of the left outer protection pipe (51) of the left thermal insulation pipe (5). The right end of the interface elastic sleeve (2) is sleeved on the surface of the right outer protection pipe (61) of the right thermal insulation pipe (6) at the interface of the thermal insulation pipeline. The inner diameter of the right port of the interface elastic sleeve (2) is less than or equal to the outer diameter of the right outer protection pipe (61) of the right thermal insulation pipe (6). A closed cavity is formed between the right end face of the interface elastic sleeve (2) and the left thermal insulation pipe (5), the outer wall of the left pipe body (50) of the left thermal insulation pipe (5), and the left end face of the right thermal insulation pipe (6). The interface thermal insulation material is filled in the closed cavity; The thermal insulation structure further includes a left waterproof sleeve (7). The left waterproof sleeve (7) is used to separate the left thermal insulation layer (52) of the left thermal insulation pipe (5) from the interface thermal insulation material. The left waterproof sleeve (7) is integrally formed with the interface elastic sleeve (2). The left waterproof sleeve (7) includes a left sealing sleeve (71) sleeved on the outer wall of the left pipe body (50) of the left thermal insulation pipe (5). The left end of the left sealing sleeve (71) is provided with a left flange layer (72) integrally formed with the left sealing sleeve (71). The outermost side of the left flange layer (72) extends outward to the interface elastic sleeve (2) and is integrally formed and connected with the interface elastic sleeve (2); The interface thermal insulation material includes a prefabricated thermal insulation material (11) wrapped on the outer wall of the left pipe body (50) of the left thermal insulation pipe (5) and a filling type thermal insulation material (12) located outside the prefabricated thermal insulation material (11). The prefabricated thermal insulation material (11) is sleeved on the left sealing sleeve (71) and the left pipe body (50) and is clamped between the left flange layer (72) and the socket end face of the right pipe body (60) of the right thermal insulation pipe (6). The filling type thermal insulation material (12) fills the closed cavity located outside the prefabricated thermal insulation material (11).

2. The thermal insulation structure for protecting the interface of the thermal insulation pipeline according to claim 1, wherein: It further includes a right waterproof sleeve (8). The right waterproof sleeve (8) is used to separate the right thermal insulation layer (62) of the right thermal insulation pipe (6) from the interface thermal insulation material.

3. The thermal insulation structure for protecting the interface of the thermal insulation pipeline according to claim 2, characterized in that: The right waterproof sleeve (8) includes an inner sealing sleeve (81) sleeved on the outer wall of the right pipe body (60) and an outer sealing sleeve (82) sleeved on the outer wall of the left end of the right outer protection pipe (61). The right end face of the inner sealing sleeve (81) is integrally formed and connected with the left end face of the outer sealing sleeve (82) through a right flange layer (83). The right flange layer (83) is closely attached to the left end face of the right thermal insulation layer (62). The right end of the interface elastic sleeve (2) is wrapped around the outer circumference of the outer sealing sleeve (82).

4. The thermal insulation structure for protecting the interface of the thermal insulation pipeline according to claim 3, characterized in that: The left end of the interface elastic sleeve (2) is fixed on the left outer protective pipe (51) of the left heat preservation pipe (5) through the left tightening device (3) or sealant, and the right end of the interface elastic sleeve (2) is fixed on the surface of the right outer protective pipe (61) of the right heat preservation pipe (6) through the right tightening device (4) or sealant.

5. The thermal insulation structure for protecting the interface of the thermal insulation pipeline according to claim 4, characterized in that: Waterlines (21) for enhancing the sealing effect are respectively arranged on the inner walls of the left and right ports of the interface elastic sleeve (2).

6. The thermal insulation pipeline interface protection and thermal insulation structure according to claim 3 or 5, characterized in that: The right end of the interface elastic sleeve (2) is sleeved on the right outer protective pipe (61) of the socket section of the right heat preservation pipe (6).

7. The thermal insulation structure for protecting the interface of the thermal insulation pipeline according to claim 3 or 4, characterized in that: The right end of the interface elastic sleeve (2) is sleeved on the right outer protective pipe (61) of the horizontal section of the right heat preservation pipe (6).

8. The thermal insulation structure for protecting the interface of the thermal insulation pipeline according to claim 7, characterized in that: The longitudinal section of the middle part of the interface elastic sleeve (2) for wrapping the interface heat preservation material is one of a rectangular, conical, elliptical, circular or other combined special-shaped structures.

9. The thermal insulation structure for protecting the interface of the thermal insulation pipeline according to claim 8, wherein: Two middle tightening devices (9) are symmetrically arranged on the left and right sides of the middle part of the interface elastic sleeve (2).

10. A construction method for using the heat preservation pipeline interface protection and heat preservation structure according to any one of claims 4 - 8, characterized in that: S1: Clean the port heat preservation layer, the surface of the outer protective pipe, and the outer walls of the socket and spigot bases at the interfaces of the left and right heat preservation pipelines to make the surfaces flat without oil stains and impurities. S2: Sleeve the left port of the interface elastic sleeve (2) on the left outer protective pipe (51) of the left heat preservation pipe (5), and at the same time sleeve the left waterproof sleeve (7) integrally formed with the interface elastic sleeve (2) on the left pipe body (50), so that the left flange layer (72) of the left waterproof sleeve (7) closely adheres to the end face of the left heat preservation layer (52) of the left heat preservation pipe (5), and then turn the right end of the interface elastic sleeve (2) up to the outer periphery of its left end. S3: Sleeve the inner seal sleeve (81) of the right waterproof sleeve (8) on the socket base of the right heat preservation pipe (6), and at the same time sleeve the outer seal sleeve (82) of the right waterproof sleeve (8) on the left end of the right outer protective pipe (61), so that the right flange layer (83) of the right waterproof sleeve (8) closely adheres to the right heat preservation layer (62) of the right heat preservation pipe (6). S4: Install the spigot of the left heat preservation pipe (5) into the socket of the right heat preservation pipe (6). After the heat preservation pipelines are connected in place, wind the prefabricated heat preservation material (11) on the outer wall of the left pipe body (50) at the interface of the heat preservation pipelines and on the left seal sleeve (71) of the left waterproof sleeve (7), and then turn the right end of the interface elastic sleeve (2) down to wrap it on the outer seal sleeve (82) on the outer wall of the right outer protective pipe (61). S5: Fix the left and right ends of the interface elastic sleeve (2) on the left and right outer protective pipes (51, 61) respectively through the left and right tightening devices (3, 4) or sealant. S6: Open a filling hole on the interface elastic sleeve (2), and perform an airtightness test on the sealed cavity wrapped by the interface elastic sleeve (2) through the filling hole. S7: After the airtightness test is okay, open an air outlet hole on the interface elastic sleeve (2), and then inject the filling type heat preservation material (12) into the cavity through the filling hole until the filling type heat preservation material fills the cavity space and forms a combined body with the prefabricated heat preservation material (11). S8: Plug the filling hole and the air outlet hole.

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