Prefabricated thermal insulation pipeline

Abstract

The embodiment of the invention provides a prefabricated heat preservation pipeline, and relates to the field of heat preservation pipes. The prefabricated heat preservation pipeline comprises a working steel pipe, the outer side of the working steel pipe is sleeved with an outer sleeve steel pipe, supporting bases are arranged at the two ends of the working steel pipe, and the working steel pipe supporting bases and the outer sleeve steel pipe form a closed bin. The ultra-fine glass wool felt with the thickness of 250 mm is used, the heat preservation interlayer is subjected to gas replacement, air is replaced with carbon dioxide, the heat preservation effect is remarkably improved, glass wool is adopted as a heat preservation material, cost is saved, the supporting seats made of hard polyurethane foam are arranged at the two ends of the pipeline, and the heat preservation effect is improved. And a sealing bin is formed among the outer sleeve steel pipe, the supporting seat and the working steel pipe, so that the stability and the sealing performance of the structure are enhanced.

Description

Technical Field

[0001] The present application relates to the technical field of thermal insulation pipes, and in particular to prefabricated thermal insulation pipes. Background Art

[0002] Prefabricated direct buried cold (hot) water insulation pipe has been around for more than 50 years since its introduction in the 20th century. Its structure consists of a steel core pipe (working pipe), a high-density polyethylene jacket steel pipe and a rigid polyurethane foam insulation layer. The rigid polyurethane foam is bonded to the polyethylene jacket steel pipe and the working steel pipe to form a three-in-one structure, which is suitable for non-compensated laying.

[0003] The thickness of the polyurethane foam layer varies from 90mm to 40mm depending on the pipe diameter. When a compensatory method is used to design and construct the pipeline network, the thermal expansion and contraction of the working steel pipe causes the hard polyurethane foam layer to tear and the outer jacket interface to be damaged, which has always been a major pain point in the industry.

[0004] In addition, a 40 mm to 90 mm thick insulation layer is not a reasonable thickness for an urban heating network.

[0005] Among commonly used insulation materials, rigid polyurethane foam has the lowest thermal conductivity. If we use conventional ideas to design hot and cold water insulation pipes, it is difficult to break through the current insulation pipe structure.

[0006] In terms of steam insulation pipes, in order to improve the insulation capacity, the industry began to use a large number of nanoporous aerogel felts. The thermal insulation performance of aerogel felt is better than that of polyurethane foam and a number of conventional insulation materials. However, the price of aerogel felt is 8-10 times that of polyurethane foam, and the ratio to glass wool is as high as 20 to 1, which greatly increases the cost of pipeline construction. Summary of the invention

[0007] The present application aims to at least solve the problem that the conventional prefabricated direct buried cold (hot) water insulation pipe in the prior art uses hard polyurethane foam as the insulation layer, and its insulation effect has not been improved for a long time. To this end, the present application proposes a high-efficiency insulation pipe and an implementation method.

[0008] The prefabricated insulated pipe according to the embodiment of the present application includes a working steel pipe, an outer sleeve steel pipe is provided on the outer side of the working steel pipe, support seats are provided at both ends of the working steel pipe, and the working steel pipe support seat and the outer sleeve steel pipe form a closed chamber.

[0009] Furthermore, the closed chamber which is closed on all sides is filled with fluffy and porous glass wool.

[0010] Furthermore, the closed chamber in the low vacuum state is re-injected with a gas with low thermal conductivity to achieve gas replacement.

[0011] Furthermore, the support seat is made of hard closed-cell polyurethane foam.

[0012] Furthermore, positioning steel plates are provided outside the working steel pipe and the outer sleeve steel pipe. There are at least three positioning steel plates, which are evenly distributed along the circumferential direction. The positioning steel plates are respectively fixed to the working steel pipe and the outer sleeve steel pipe by welding.

[0013] 1. The beneficial effects of the present application are as follows: by using 250 mm thick ultra-fine glass wool felt and performing gas replacement on the thermal insulation interlayer, replacing air with carbon dioxide, the thermal insulation effect is significantly improved, and the use of glass wool as the thermal insulation material saves costs. By arranging support seats made of rigid polyurethane foam at both ends of the pipeline and forming a sealed chamber between the outer jacket steel pipe, the support seat and the working steel pipe, the stability and sealing performance of the structure are enhanced.

[0014] 2. The beneficial effects of the present application are: in order to prevent the steel pipes from being misplaced during transportation and lifting, the two insulated pipes are fixed by welding with steel plates before leaving the factory, and the positioning steel plates are removed before the pipeline interfaces are closed during the pipe network construction. At the same time, the working steel pipe and the outer sleeve steel pipe can be flexibly connected by using positioning sleeves, screws and fixing blocks, which can replace the use of positioning steel plates and improve the efficiency of disassembly.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 is a schematic diagram of the overall three-dimensional structure of a prefabricated thermal insulation pipe according to an embodiment of the present application;

[0018] Figure 2 is a schematic top view of the overall structure according to an embodiment of the present application;

[0019] Figure 3 According to the embodiment of the present application Figure 2 Schematic diagram of the structural section at AA in the middle;

[0020] Figure 4 is a schematic cross-sectional view of the outer jacket steel pipe structure according to an embodiment of the present application;

[0021] Figure 5 is a schematic diagram of the installation state of the positioning sleeve according to an embodiment of the present application;

[0022] Figure 6 This is a schematic diagram of the disassembly of the positioning sleeve and the working steel pipe structure according to an embodiment of the present application;

[0023] Figure 7 According to the embodiment of the present application Figure 6 A schematic diagram of the structure at A;

[0024] Figure 8 It is a schematic diagram of the structure of the positioning sleeve, the screw rod, etc. according to an embodiment of the present application;

[0025] Fig. 9 According to the embodiment of the present application Figure 8 Schematic diagram of the plan structure.

[0026] Figure numerals: 1. working steel pipe; 2. positioning steel plate; 3. outer steel pipe; 4. support seat; 5. copper ring; 6. glass wool; 7. fixing block; 8. plug-in rod; 9. positioning sleeve; 10. positioning groove; 11. screw; 12. nut; 13. socket; 14. slide rail; 15. screw rod; 16. jacket. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0028] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] The following describes a prefabricated insulated pipe according to an embodiment of the present application with reference to the accompanying drawings.

[0036] Embodiment 1

[0037] like Figure 1-Figure 4As shown, the prefabricated insulated pipe according to the embodiment of the present application includes a working steel pipe 1, an outer sleeve steel pipe 3 is provided on the outer side of the working steel pipe 1, the outer sleeve steel pipe 3 is made of steel pipe, and support seats 4 are provided at both ends of the working steel pipe 1. The outer sleeve steel pipe 3, the support seat 4 and the working steel pipe 1 form a sealed chamber. In order to improve the insulation effect, the air in the sealed chamber is replaced with carbon dioxide. The thermal conductivity of carbon dioxide is lower than that of air, which means that it can more effectively prevent the conduction of heat, thereby improving the overall insulation effect of the insulation layer.

[0038] And the inside of the sealed chamber is filled with glass wool 6, which is an ultra-fine glass wool felt with a thickness of 250 mm. It is laid on the outside of the working steel pipe 1. The glass wool 6 is used as the main thermal insulation material to replace the traditional hard polyurethane foam to optimize the thermal insulation effect.

[0039] In order to prevent carbon dioxide from escaping, the end surface of the insulation layer is sealed with sealant, that is, the glass wool 6 and the support seat 4 are sealed with sealant.

[0040] The support seat 4 is tightly connected to the working steel pipe 1 through a copper ring 5 arranged inside, and the support seat 4 is made of hard polyurethane foam to enhance structural stability and sealing performance.

[0041] In addition to being applicable to air conditioning cold water pipe networks, the present invention can also be used for hot water heating pipe networks and steam supply pipe networks. When used in steam pipe networks, the inner circle of the support seat 4 supporting the working steel pipe 1 is made of microporous calcium silicate tiles and the outer circle is made of hard polyurethane foam.

[0042] like Figure 1 As shown, in order to prevent the working steel pipe 1 and the outer steel pipe 3 from being misaligned during transportation and lifting, thereby damaging the end face seal of the insulation layer, the working steel pipe 1 and the outer steel pipe 3 are welded with a positioning steel plate 2 before the insulation pipe leaves the factory, and the positioning steel plate 2 is removed before the pipeline interface is closed during pipeline network construction, and the positioning steel plate 2 is used to prevent the working steel pipe 1 and the outer steel pipe 3 from being misaligned.

[0043] Example: Taking the φ630 air-conditioning cold water pipe as an example, the temperature of the cold water is 5℃, and the soil temperature in the pipe laying area is 25℃. According to traditional technology, a 50mm thick rigid polyurethane foam insulation layer is wrapped outside the steel pipe. After calculation, the cold loss intensity q of the pipe network is equal to 18.82w / m.

[0044] According to the scheme of the present invention, 250mm thick ultra-fine glass wool felt is laid outside the φ630 steel pipe and gas replacement is performed on the thermal insulation interlayer. Under the same conditions, the cold loss intensity of the pipe network can be reduced to 4.59w / m, which is 3 / 4 less than that of the traditional scheme.

[0045] Calculated at 560 yuan per cubic meter of glass wool 6, the cost of glass wool 6 per meter of pipe in this case is 387 yuan; according to the traditional process of making insulated cold water pipes and laying 230mm thick nano aerogel, the same effect of cold loss of 4.59w / m can be achieved, but the cost of aerogel is 8000 yuan per cubic meter, which is 4972 yuan / meter, 12 times higher than the 387 yuan / meter of the present invention.

[0046] Therefore, compared with traditional insulation pipes, this case solves the problems of insufficient insulation effect, poor structural stability, low economic benefits and limited scope of application.

[0047] Embodiment 2

[0048] In addition, if Figures 5 to 9 As shown, considering the problem that after the working steel pipe 1 and the outer sleeve steel pipe 3 are positioned by the positioning steel plate 2, there is a certain inconvenience during disassembly, improvements are made on the basis of the above embodiment.

[0049] At least three fixing blocks 7 are distributed in an annular manner on the outer side of the outer sleeve steel pipe 3, and holes are opened on the fixing blocks 7. A positioning sleeve 9 is sleeved on the end of the working steel pipe 1. The positioning sleeve 9 is fixed to the end of the working steel pipe 1 by using the positioning groove 10 on the inner side of the positioning sleeve 9 to fit with the end of the working steel pipe 1. Since at least three screws 11 are distributed in an annular manner on the outer side of the positioning sleeve 9, the screws 11 are passed through the fixing blocks 7 and are threadedly connected with the nuts 12, so that the working steel pipe 1 and the outer sleeve steel pipe 3 can be connected.

[0050] Furthermore, a plug-in rod 8 is threadedly connected to one end of the fixing block 7, and the plug-in rod 8 is plugged into a socket 13 opened at one end of the screw rod 11. The plug-in rod 8 is rotated to allow the plug-in rod 8 to enter the socket 13, thereby further fixing the screw rod 11 and preventing the screw rod 11 from shaking.

[0051] Furthermore, slide rails 14 are symmetrically arranged on both sides of the positioning sleeve 9, and screw rods 15 are rotatably arranged in the two slide rails 14. The two screw rods 15 are respectively threadedly connected to two oppositely arranged sleeves 16, and one end of the sleeve 16 is slidably connected to the slide rail 14. Therefore, when the screw rod 15 rotates, the two sleeves 16 are urged to approach the working steel pipe 1 to fix the working steel pipe 1, thereby further improving the stability of the fixation of the working steel pipe 1. At the same time, this structure is more flexible, easy to disassemble, and easy to reuse.

[0052] The working principle of the prefabricated insulated pipe: a support seat 4 is set at each end of the working steel pipe 1, and the outer jacket steel pipe 3, the support seat 4 and the working steel pipe 1 form a sealed chamber. In order to improve the insulation effect, the air in the sealed chamber is replaced with carbon dioxide. In order to prevent the escape of carbon dioxide in the sealed chamber, the end face of the insulation layer is sealed with sealant. In order to prevent the working steel pipe 1 and the outer jacket steel pipe 3 from being misaligned during transportation and lifting, which will damage the seal of the end face of the insulation layer, the working steel pipe 1 and the outer jacket steel pipe 3 are welded with a positioning steel plate 2 before the insulated pipe leaves the factory, and the positioning steel plate 2 needs to be removed before the pipeline interface is closed during the pipeline network construction.

[0053] The above are only embodiments of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0054] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. The thermal insulation structure, material, and implementation method of the present invention are applicable to airplanes, cars, trains, ships, cold storages, factories, public buildings, residences, and other places that require thermal insulation. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. Prefabricated insulated pipe, characterized by: The invention comprises a working steel pipe (1), the outer side of the working steel pipe (1) is provided with an outer sleeve steel pipe (3), support seats (4) are provided at both ends of the working steel pipe (1), and the working steel pipe (1), the support seat (4) and the outer sleeve steel pipe (3) form a closed chamber.

2. The prefabricated thermal insulation pipe according to claim 1, characterized in that: The closed chamber which is closed on all sides is filled with fluffy and porous glass wool (6).

3. The prefabricated thermal insulation pipe according to claim 2, characterized in that: The air in the closed chamber is completely evacuated to achieve a low vacuum level.

4. The prefabricated thermal insulation pipe according to claim 3, characterized in that: The closed chamber in a low vacuum state is re-injected with a gas with low thermal conductivity to achieve gas replacement.

5. The prefabricated thermal insulation pipe according to claim 1, characterized in that: The support seat (4) is made of hard closed-cell polyurethane foam.

6. The prefabricated thermal insulation pipe according to claim 1, characterized in that: Positioning steel plates (2) are provided outside the working steel pipe (1) and the outer sleeve steel pipe (3). There are at least three positioning steel plates (2) evenly distributed along the circumferential direction. The positioning steel plates (2) are respectively fixed to the working steel pipe (1) and the outer sleeve steel pipe (3) by welding.

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