Heat preservation pipeline capable of conveying heat supply, water supply and return water in same pipe

Abstract

The utility model relates to a heat preservation pipeline capable of conveying heat supply and water supply and return water in the same pipe, which comprises a working ring pipe inner pipe used for conveying heat supply and water supply to users, an inter-pipe heat preservation layer wrapping the working ring pipe inner pipe, a working ring pipe outer pipe sleeved outside the inter-pipe heat preservation layer, and a heat preservation structure layer of the working ring pipe outer pipe. An annular cavity used for conveying heat supply return water is formed among the inter-pipe heat preservation layer, the working ring pipe outer pipe and the heat preservation structure layer of the working ring pipe, in the using process, the heat supply water flows in the working ring pipe inner pipe, the heat supply return water flows between the working ring pipe outer pipe and the heat preservation structure layer of the working ring pipe outer pipe and the inter-pipe heat preservation layer, and the water supply and the return water flow reversely. By the adoption of the heat preservation pipeline, heat supply, water supply and return water can be conveyed in the same pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal pipelines for municipal heating, in particular to a heat-insulating pipeline for conveying heating water supply and heating return water in the same pipeline. Background Art

[0002] Urban centralized heating uses steam or hot water as the medium to supply heat for life and production to users in the entire city or a certain area through the heating pipe network. It is also called regional heating and is an infrastructure for urban energy construction. The urban centralized heating system includes three parts: heat source, heat network and user. The heat network is divided into hot water heat network and steam heat network; according to the number of pipes laid in parallel on the line, it is divided into single-pipe, double-pipe and multi-pipe systems; according to whether the hot water heat network directly consumes the water, it is divided into open and closed systems. The hot water single-pipe system has only one water supply pipe. The hot water is sent to the user's heating and ventilation system. Through surface heat exchange, part of the heat is released and then used as the user's domestic hot water. It is no longer returned to the heat source. Therefore, this system is open. It is relatively simple, but only suitable for areas with sufficiently large domestic hot water loads. The hot water double-pipe system usually consists of a water supply pipe and a return pipe. It is a system that is commonly used in urban heating facilities. It has two forms: closed and open. In a closed system, hot water is transported from the heat source along the water supply pipe to the user's heating, ventilation and other heat-using systems. After the temperature is reduced by surface heat exchange, it returns to the heat source along the return pipe. In an open system, part of the hot water in the return pipe is supplied to the user for domestic hot water. The hot water multi-pipe system is relatively complex and is only used when the user has two or more different temperature requirements or different adjustment characteristics. The steam heat network is divided into two systems: with condensate pipes and without condensate pipes. The condensate pipe system is generally used. The steam is transported from the heat source to the user through the steam supply pipe. After releasing heat and forming condensate in the heat-using device, it returns to the heat source along the condensate pipe. The non-condensate pipe system has only one steam supply pipe. It is only suitable for occasions where steam is directly consumed or the condensate is polluted after passing through the heat-using equipment and has no recovery value. The urban heating pipe network is generally laid underground. Only in places such as industrial areas or suburbs where the impact on traffic and urban appearance is not great, the ground laying method is adopted.

[0003] At present, the hot water heating system is mainly a double-pipe closed system, and the pipelines are mostly made of high-density polyethylene direct-buried insulation pipes. The technology is mature and the corresponding specifications are complete. The pipeline is one supply and one return. Considering the installation needs, the supply and return pipes generally ensure a spacing of 0.2-0.3m. The two pipes occupy a large width. In the old city, the roads are narrow. The water pipes, rainwater and sewage pipes, gas pipes, power and communication cables and other pipelines on both sides of the road have been laid on both sides of the road. New heating pipes often have no space for laying. Utility Model Content

[0004] The purpose of the utility model is to solve the above technical problems and provide a heat preservation pipe which can transport heating water supply and heating return water in the same pipe, thereby reducing the space occupied by the heating pipe.

[0005] Specifically, the utility model provides an insulated pipe that can transport heating water supply and return water in the same pipe, which includes: a working ring pipe inner pipe for transporting heating water supply to users, an inter-tube insulation layer that wraps the working ring pipe inner pipe, a working ring pipe outer pipe and its insulation structure layer are covered on the outside of the inter-tube insulation layer, and an annular cavity for transporting heating return water is formed between the inter-tube insulation layer and the working ring pipe outer pipe and its insulation structure layer. When in use, the heating water supply flows in the working ring pipe inner pipe, and the heating return water flows between the working ring pipe outer pipe and its insulation structure layer and the inter-tube insulation layer, and the supply water and return water flow in the reverse direction.

[0006] Furthermore, the working ring pipe outer pipe and its insulation structure layer include, from the inside to the outside, a closely contacted working ring pipe outer pipe, an outer insulation layer and a protective layer. The working ring pipe outer pipe can be, for example, a seamless steel pipe or a spiral seam welded steel pipe. The thickness of the outer insulation layer can be, for example, 10-50mm, preferably 20-30mm. The material of the outer insulation layer can be, for example, polyurethane, closed-cell rubber and plastic foam, etc. The outer insulation layer is used to reduce the heat loss of return water to the outside; the thickness of the protective layer can be, for example, 5-20mm, preferably 8-15mm. The protective layer can be, for example, a high-density polyethylene outer protective pipe or a glass fiber reinforced plastic pipe.

[0007] Furthermore, a support structure assembly is fixed on the outer surface of the inner tube of the working ring tube, which extends out of the inter-tube insulation layer along the radial direction of the inner tube of the working ring tube and extends to the inner wall of the outer tube of the working ring tube. The support structure assembly includes a plurality of support rods that are spaced apart from each other around the outer circumference of the inner tube of the working ring tube and fixed to the outer surface of the inner tube of the working ring tube. Preferably, the circumferential spacing between adjacent support rods is consistent. The plurality of support rods are, for example, located on the same cross-section of the inner tube of the working ring tube. The plurality of support rods located on the same cross-section of the inner tube of the working ring tube are divided into a group. The distance between adjacent groups of support rods in the length direction of the inner tube of the working ring tube can be, for example, 50-500 cm. The number of support rods in each group can be, for example, 3 to 5. One end of the support rod is fixedly connected to the inner tube of the working ring tube, and a sliding head is fixed on the top of the other end. The sliding head is, for example, a spherical structure. The sliding head is connected to the inner wall of the outer tube of the working ring tube by sliding contact, so as to support the inner tube of the working ring tube. At the same time, the different degrees of thermal expansion of the inner tube of the working ring tube and the outer tube of the working ring tube due to different temperatures can be released through relative sliding between the sliding head at the top of the support rod and the outer tube of the working ring tube. The length of the support structure is generally the difference between the inner diameter of the outer tube of the working ring tube and the outer diameter of the inner tube of the working ring tube.

[0008] Furthermore, the thickness of the inter-pipe insulation layer can be, for example, 10-50 mm, preferably 20-30 mm, and the material of the inter-pipe insulation layer can be, for example, polyurethane foam, polystyrene foam, etc., preferably closed-cell foam. The inter-pipe insulation layer is tightly bonded to the inner pipe of the working ring pipe and has hydrophobic and pressure-resistant properties.

[0009] Furthermore, the inner tubes of adjacent working ring tubes are connected by welding, and the outer tubes of adjacent working ring tubes are connected by welding.

[0010] Compared with the prior art, the utility model has the following advantages:

[0011] The thermal insulation pipe of the utility model is a sleeve structure. The inner pipe of the working ring pipe transports high-temperature heating water, and the space between the inner pipe of the working ring pipe and the outer pipe of the working ring pipe transports low-temperature heating return water. Under the condition of transporting the same amount of heat, the occupied width of the heating pipe can be reduced by about one third; the heat dissipated by the high-temperature water supply pipe is absorbed by the low-temperature return water between the inner pipe of the working ring pipe and the outer pipe of the working ring pipe, thereby reducing the heat loss of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of a heat preservation pipe capable of transporting heating water supply and return water in the same pipe according to the utility model;

[0013] 1-working ring pipe outer pipe and its insulation structure layer, 1-1 working ring pipe outer pipe, 1-2 pipe outer insulation layer, 1-3 protective layer, 2-inter-tube insulation layer, 3-working ring pipe inner pipe, 4-support structure assembly, 4-1-support rod, 4-2-sliding head. DETAILED DESCRIPTION

[0014] Combined with Figure 1 The functions that can be realized by the utility model in a municipal hot water system are further described in detail.

[0015] See also Figure 1 The utility model provides an insulated pipeline which can transport heating water supply and return water in the same pipe, comprising: a working ring pipe inner pipe 3 for transporting heating water supply to users, an inter-tube insulation layer 2 wrapping the working ring pipe inner pipe 3, a working ring pipe outer pipe and its insulation structure layer 1 are sheathed on the outside of the inter-tube insulation layer 2, and an annular cavity for transporting heating return water is formed between the inter-tube insulation layer 2 and the working ring pipe outer pipe and its insulation structure layer 1. When in use, the heating water supply flows in the working ring pipe inner pipe 3, and the heating return water flows between the working ring pipe outer pipe and its insulation structure layer 1 and the inter-tube insulation layer 2, and the supply water and return water flow in the reverse direction.

[0016] The working ring pipe outer pipe and its insulation structure layer 1 include, from the inside to the outside, a closely contacted working ring pipe outer pipe 1-1, an outer insulation layer 1-2 and a protective layer 1-3. The working ring pipe outer pipe 1-1 can be, for example, a seamless steel pipe or a spiral seam welded steel pipe. The thickness of the outer insulation layer 1-2 can be, for example, 10-50mm, preferably 20-30mm. The material of the outer insulation layer 1-2 can be, for example, polyurethane, closed-cell rubber and plastic foam, etc. The outer insulation layer 1-2 is used to reduce the heat loss of return water to the outside; the thickness of the protective layer 1-3 can be, for example, 5-20mm, preferably 8-15mm. The protective layer 1-3 can be, for example, a high-density polyethylene outer protective pipe or a glass fiber reinforced plastic pipe.

[0017] The outer surface of the working ring tube inner tube 3 is fixed with a support structure assembly 4 which extends radially out of the inter-tube insulation layer 2 and extends to the inner wall of the working ring tube outer tube 1-1. The support structure assembly 4 includes a plurality of support rods 4-1 which are spaced apart from each other around the outer circumference of the working ring tube inner tube 3 and fixed to the outer surface of the working ring tube inner tube 3. Preferably, the circumferential spacing between adjacent support rods 4-1 is consistent. For example, a plurality of support rods 4-1 are located on the same cross section of the working ring tube inner tube 3. The plurality of support rods 4-1 located on the same cross section of the working ring tube inner tube 3 are divided into a group. In the length direction of the working ring tube inner tube 3, a plurality of adjacent support rods of a group are spaced apart from each other. The distance between the two can be, for example, 50-500cm, the number of each group of support rods can be, for example, 3-5, one end of the support rod is fixedly connected to the working ring tube inner tube 3, and the other end is a sliding head 4-2, the sliding head is, for example, a spherical structure, the sliding head 4-2 is connected to the inner wall of the working ring tube outer tube 1-1 by sliding contact, the sliding head at the top of the support rod is in contact with the inner wall of the working ring tube outer tube, and plays a role in supporting the working ring tube inner tube 3, and at the same time, the different degrees of thermal expansion of the working ring tube inner tube 3 and the working ring tube outer tube 1-1 caused by different temperatures can be released by relative sliding between the sliding head at the top of the support rod and the working ring tube outer tube 1-1. The length of the support structure is generally the difference between the inner diameter of the working ring tube outer tube 1-1 and the outer diameter of the working ring tube inner tube 3.

[0018] The thickness of the inter-pipe insulation layer 2 can be, for example, 10-50 mm, preferably 20-30 mm. The material of the inter-pipe insulation layer 2 can be, for example, polyurethane foam, polystyrene foam, etc. The inter-pipe insulation layer 2 is tightly bonded to the inner pipe of the working ring pipe and has hydrophobic and pressure-resistant properties.

[0019] Adjacent working ring pipe inner pipes 3 are connected by welding, and adjacent working ring pipe outer pipes 1 - 1 are connected by welding. Example 1

[0020] The invention discloses an insulated pipe capable of conveying heating water supply and return water in the same pipe, comprising: a working ring pipe inner pipe 3 for conveying heating water supply to users, an inter-tube insulation layer 2 wrapping the working ring pipe inner pipe 3, a working ring pipe outer pipe and its insulation structure layer 1 being sheathed outside the inter-tube insulation layer 2, an annular cavity for conveying heating return water is formed between the inter-tube insulation layer 2 and the working ring pipe outer pipe and its insulation structure layer 1, when in use, the heating water supply flows in the working ring pipe inner pipe 3, the heating return water flows between the working ring pipe outer pipe and its insulation structure layer 1 and the inter-tube insulation layer 2, and the supply water and return water flow in the reverse direction.

[0021] The working ring pipe outer pipe and its insulation structure layer 1 include a working ring pipe outer pipe 1-1, an outer insulation layer 1-2 and a protective layer 1-3 from the inside to the outside. The working ring pipe outer pipe 1-1 is a seamless steel pipe, the outer insulation layer 1-2 is 20 mm thick, the material of the outer insulation layer 1-2 is polyurethane foam, and the outer insulation layer 1-2 is used to reduce the heat loss of return water to the outside; the thickness of the protective layer 1-3 is 10 mm, and the protective layer 1-3 is a high-density polyethylene outer protective pipe. Example 2

[0022] The invention discloses an insulated pipe capable of conveying heating water supply and return water in the same pipe, comprising: a working ring pipe inner pipe 3 for conveying heating water supply to users, an inter-tube insulation layer 2 wrapping the working ring pipe inner pipe 3, a working ring pipe outer pipe and its insulation structure layer 1 being sheathed outside the inter-tube insulation layer 2, an annular cavity for conveying heating return water is formed between the inter-tube insulation layer 2 and the working ring pipe outer pipe and its insulation structure layer 1, when in use, the heating water supply flows in the working ring pipe inner pipe 3, the heating return water flows between the working ring pipe outer pipe and its insulation structure layer 1 and the inter-tube insulation layer 2, and the supply water and return water flow in the reverse direction.

[0023] The working ring pipe outer pipe and its insulation structure layer 1 include a working ring pipe outer pipe 1-1, an outer insulation layer 1-2 and a protective layer 1-3 from the inside to the outside. The working ring pipe outer pipe 1-1 is a seamless steel pipe, the outer insulation layer 1-2 is 20 mm thick, the outer insulation layer 1-2 is made of polyurethane foam, and the outer insulation layer 1-2 is used to reduce the heat loss of return water to the outside; the protective layer 1-3 is 10 mm thick, and the protective layer 1-3 is a high-density polyethylene outer protective pipe.

[0024] The outer surface of the inner tube 3 of the working ring tube is fixed with a support structure assembly 4 extending radially out of the inter-tube insulation layer 2 of the inner tube 3 of the working ring tube and extending to the inner wall of the outer tube 1-1 of the working ring tube. The support structure assembly 4 includes a group of three support rods 4-1 spaced from each other around the outer circumference of the inner tube 3 of the working ring tube and fixed to the outer surface of the inner tube 3 of the working ring tube. The circumferential spacing between adjacent support rods 4-1 is consistent. The three support rods 4-1 are located on the same cross section of the inner tube 3 of the working ring tube. The distance between adjacent groups of support rods in the length direction of the inner tube 3 of the working ring tube is The distance is 200cm, one end of the support rod is fixedly connected to the working ring tube inner tube 3, and the other end is a sliding head 4-2, which is a spherical structure. The sliding head 4-2 is connected to the inner wall of the working ring tube outer tube 1-1 by sliding contact, and the sliding head at the top of the support rod is in contact with the inner wall of the working ring tube outer tube, which plays a role in supporting the working ring tube inner tube 3. At the same time, the different degrees of thermal expansion of the working ring tube inner tube 3 and the working ring tube outer tube 1-1 caused by different temperatures can be released through the relative sliding between the sliding head at the top of the support rod and the working ring tube outer tube 1-1.

[0025] The thickness of the inter-pipe insulation layer 2 is 20 mm. The material of the inter-pipe insulation layer 2 is polyurethane foam. The inter-pipe insulation layer 2 is tightly bonded to the inner pipe of the working ring pipe and has hydrophobic and pressure-resistant properties.

[0026] The above describes the preferred embodiments of the present invention, however, the above description is not intended to be limiting. A person skilled in the art may make many changes or modifications to the present invention without departing from the spirit and scope of the present invention. The changes or modifications should be included in the scope of the appended claims.

Claims

1. An insulated pipe capable of transporting heating water supply and return water in the same pipe, characterized in that: It comprises: a working ring pipe inner pipe (3) for conveying heat and water supply to users, an inter-tube thermal insulation layer (2) wrapping the working ring pipe inner pipe (3), a working ring pipe outer pipe and its thermal insulation structure layer (1) being sheathed outside the inter-tube thermal insulation layer (2), and an annular cavity for conveying heat return water is formed between the inter-tube thermal insulation layer (2) and the working ring pipe outer pipe and its thermal insulation structure layer (1).

2. The heat-insulating pipe capable of transporting heating water supply and return water in the same pipe according to claim 1 is characterized in that: The working annular pipe outer pipe and its thermal insulation structure layer (1) comprise, from the inside to the outside, a working annular pipe outer pipe (1-1) in close contact, an outer pipe thermal insulation layer (1-2) and a protective layer (1-3).

3. The heat-insulating pipe capable of transporting heating water supply and return water in the same pipe according to claim 2 is characterized in that: A supporting structure component (4) is fixed to the outer surface of the working annular tube inner tube (3), extending radially out of the inter-tube thermal insulation layer (2) of the working annular tube inner tube (3) and to the inner wall of the working annular tube outer tube (1-1).

4. The heat-insulated pipe capable of transporting heating water supply and return water in the same pipe according to claim 3 is characterized in that: The support structure assembly (4) comprises a plurality of support rods (4-1) which are spaced apart from each other around the outer circumference of the working annular tube inner tube (3) and fixed to the outer surface of the working annular tube inner tube (3).

5. The heat-insulating pipe capable of transporting heating water supply and return water in the same pipe according to claim 4 is characterized in that: The circumferential spacing between adjacent support rods is consistent.

6. The heat-insulating pipe capable of transporting heating water supply and return water in the same pipe according to claim 4, characterized in that: The plurality of support rods (4-1) are located on the same cross section of the working ring tube inner tube (3), and the plurality of support rods (4-1) located on the same cross section of the working ring tube inner tube (3) are divided into a group, and the distance between adjacent groups of support rods in the length direction of the working ring tube inner tube (3) is 50-500 cm.

7. The heat-insulating pipe capable of transporting heating water supply and return water in the same pipe according to any one of claims 4 to 6, characterized in that: A sliding head (4-2) is fixed on the top of the support rod (4-1), and the sliding head (4-2) is slidable relative to the outer tube of the working ring tube and the thermal insulation structure layer (1).

8. The heat-insulating pipe capable of transporting heating water supply and return water in the same pipe according to claim 1, characterized in that: The thickness of the inter-pipe insulation layer (2) is 10-50 mm.

9. The heat-insulating pipe capable of transporting heating water supply and return water in the same pipe according to claim 2, characterized in that: The thickness of the protective layer (1-3) is 5-20 mm.

10. The heat-insulating pipe capable of transporting heating water supply and return water in the same pipe according to claim 2, characterized in that: The inter-tube insulation layer (2) and the outer tube insulation layer (1-2) are polyurethane foam.

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