Vacuum partition structure of low-temperature pipeline

Abstract

The utility model discloses a low-temperature pipeline vacuum partition structure which comprises a heat preservation sleeve and a fluid conveying pipe, the fluid conveying pipe is arranged on the inner side of the heat preservation sleeve, a partition pipe is arranged between the heat preservation sleeve and the fluid conveying pipe, and the end of the heat preservation sleeve and the end of the partition pipe are fixedly connected through a sealing plate. The fluid conveying pipe penetrates through the sealing plate, the outer wall of the fluid conveying pipe and the sealing plate are subjected to sealing treatment, and a vacuum opening is formed in the outer wall of the heat preservation sleeve. Through the synergistic effect of the outer vacuum layer and the inner vacuum layer, the outer vacuum layer isolates an environmental heat source, the inner vacuum layer is combined with the nano-porous aerogel to be filled, gas conduction, solid heat conduction and radiation heat transfer can be restrained at the same time, the heat preservation layer is divided into multiple cavities through the corrugated aluminum foil radiation reflection plate, the reflectivity is improved, and the radiation heat transfer proportion is reduced; the inverted-V-shaped supporting piece is made of low-heat-conduction silicon nitride ceramic, the contact area is small, compared with a traditional metal supporting piece, heat leakage is reduced, and the heat preservation and partition performance is improved.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic pipeline technology, specifically to a cryogenic pipeline vacuum isolation structure. Background Technology

[0002] The cryogenic pipeline vacuum isolation structure is a key component used in cryogenic fluid transport systems. Its core function is to block heat transfer through vacuum insulation technology, thereby reducing the loss of cold energy and consumption of media during the transport of cryogenic fluids (such as liquid oxygen, liquid nitrogen, liquefied natural gas, etc.).

[0003] Existing low-temperature pipeline vacuum isolation structures are mostly single-layer vacuum sandwich designs. Although they can reduce gas heat transfer, they are difficult to effectively block radiative heat transfer and heat conduction of solid support structures. Therefore, a low-temperature pipeline vacuum isolation structure is proposed. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a low-temperature pipeline vacuum isolation structure, which solves the problem that existing low-temperature pipeline vacuum isolation structures are mostly single-layer vacuum sandwich designs, which can reduce gas heat transfer but are difficult to effectively block radiative heat transfer and heat conduction of solid support structures.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a low-temperature pipeline vacuum isolation structure, comprising an insulation sleeve and a fluid delivery pipe, wherein the fluid delivery pipe is placed inside the insulation sleeve, and an isolation pipe is provided between the insulation sleeve and the fluid delivery pipe. The ends of the insulation sleeve and the isolation pipe are fixedly connected by a sealing plate, the fluid delivery pipe penetrates the sealing plate and the outer wall of the fluid delivery pipe is sealed to the sealing plate, a vacuum port is installed on the outer wall of the insulation sleeve, an outer vacuum layer is formed between the insulation sleeve and the isolation pipe, an inner vacuum layer is formed between the isolation pipe and the fluid delivery pipe, a connection hole is opened on the surface of the isolation pipe and the two ends of the connection hole are respectively connected to the outer vacuum layer and the inner vacuum layer, and a filter screen is installed in the connection hole.

[0008] As a further preferred embodiment of the present invention, an insulation board is connected around the surface of the fluid conveying pipe and located in the inner insulation layer, and a plurality of radiation reflectors are installed inside the insulation board.

[0009] As a further preferred embodiment of this utility model, the radiation reflector has a corrugated structure and is made of aluminum foil. The insulation board is divided into an inner insulation layer and an outer insulation layer by the radiation reflector, and the outer insulation layer is filled with glass fiber.

[0010] As a further preferred embodiment of this utility model, a plurality of getter sheets are attached to the outer wall of the partition tube and located in the outer vacuum layer, and the getter sheets are in a ring structure and are evenly distributed.

[0011] As a further preferred embodiment of the present invention, a plurality of support members are provided inside the outer vacuum layer and between two adjacent getter sheets. The support members have an inverted V-shaped structure, and the upper end of the support member is fitted and connected to the inner wall of the insulation sleeve, while the lower end of the support member is fixedly connected to the outer wall of the partition tube. The support members are made of silicon nitride ceramic material.

[0012] As a further preferred embodiment of this invention, the inner vacuum layer is filled with nanoporous aerogel.

[0013] (III) Beneficial Effects

[0014] This invention provides a vacuum isolation structure for cryogenic pipelines. It has the following beneficial effects:

[0015] This invention utilizes the synergistic effect of an outer vacuum layer and an inner vacuum layer. The outer vacuum layer isolates environmental heat sources, while the inner vacuum layer, combined with nanoporous aerogel filling, simultaneously suppresses gas conduction, solid heat conduction, and radiative heat transfer. The corrugated aluminum foil radiation reflector divides the insulation layer into multiple chambers, increasing reflectivity and reducing the proportion of radiative heat transfer. The inverted V-shaped support uses low thermal conductivity silicon nitride ceramic, resulting in a small contact area and reduced heat leakage compared to traditional metal supports, thus improving the insulation performance. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the low-temperature pipeline vacuum isolation structure described in this utility model;

[0017] Figure 2 This is an internal structural diagram of the low-temperature pipeline vacuum isolation structure described in this utility model;

[0018] Figure 3 for Figure 2 A magnified view of A in the middle.

[0019] In the diagram: 1. Insulation sleeve; 2. Vacuum port; 3. Outer vacuum layer; 4. Isolation tube; 5. Inner vacuum layer; 6. Fluid delivery pipe; 7. Support component; 8. Getter sheet; 9. Insulation board; 10. Sealing plate; 11. Connection hole; 12. Nanoporous aerogel; 13. Outer insulation layer; 14. Inner insulation layer; 15. Radiation reflector plate; 16. Filter screen. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-3 This utility model provides a technical solution: a low-temperature pipeline vacuum isolation structure, including an insulation sleeve 1 and a fluid delivery pipe 6. The fluid delivery pipe 6 is placed inside the insulation sleeve 1. An isolation pipe 4 is provided between the insulation sleeve 1 and the fluid delivery pipe 6. The ends of the insulation sleeve 1 and the isolation pipe 4 are fixedly connected by a sealing plate 10. The fluid delivery pipe 6 passes through the sealing plate 10 and the outer wall of the fluid delivery pipe 6 is sealed with the sealing plate 10. A vacuum port 2 is installed on the outer wall of the insulation sleeve 1. An outer vacuum layer 3 is formed between the insulation sleeve 1 and the isolation pipe 4. An inner vacuum layer 5 is formed between the isolation pipe 4 and the fluid delivery pipe 6. The double vacuum layer design improves the insulation effect. A connection hole 11 is opened on the surface of the isolation pipe 4, and the two ends of the connection hole 11 are respectively connected to the outer vacuum layer 3 and the inner vacuum layer 5. A filter screen 16 is installed in the connection hole 11. The filter screen 16 can prevent the nanoporous aerogel 12 from moving out of the inner vacuum layer 5.

[0022] Further improvements include a fluid delivery pipe 6 with an insulation board 9 surrounding it within the inner insulation layer 14. Several radiation reflectors 15 are installed inside the insulation board 9, and the alternating stacked radiation reflectors 15 enhance thermal resistance. The radiation reflectors 15 have a corrugated structure and are made of aluminum foil. The insulation board 9 is internally divided into an inner insulation layer 14 and an outer insulation layer 13 by the radiation reflectors 15. The outer insulation layer 13 is filled with glass fiber to reduce solid-to-solid heat conduction.

[0023] Further improved, a number of getter sheets 8 are attached to the outer wall of the partition tube 4 and located in the outer vacuum layer 3. The getter sheets 8 are annular in structure and equidistantly distributed, absorbing air from the two vacuum layers to ensure that the interior is in a vacuum state. The annular getter sheets 8 are directly attached to the outer wall of the partition tube 4, which can adsorb residual gas in situ, thus extending the vacuum life.

[0024] Further improvements include the placement of several support members 7 within the outer vacuum layer 3, positioned between two adjacent getter sheets 8. Each support member 7 has an inverted V-shaped structure, with its upper end fitted to the inner wall of the insulation sleeve 1 and its lower end fixedly connected to the outer wall of the partition tube 4. The support members 7 are made of silicon nitride ceramic material. The inverted V-shaped support members 7 have a small contact area and low single-point heat flow, significantly reducing heat leakage compared to traditional metal supports. The V-shaped structure of the support members 7 can absorb axial thermal expansion stress, preventing vacuum failure caused by weld cracking.

[0025] Further improvements include filling the inner vacuum layer 5 with nanoporous aerogel 12. The gas originally present in the nanoscale pores within the aerogel is removed under vacuum, the gas molecule collision heat transfer path disappears, the gas phase thermal conductivity approaches zero, and the aerogel's thermal insulation performance is improved under vacuum conditions.

[0026] Working principle: During use, the two vacuum layers are evacuated through the vacuum port 2 to eliminate heat transfer through gas molecule conduction and convection. Under vacuum conditions, the gas phase thermal conductivity of the aerogel approaches zero. Several radiation reflectors 15, insulation boards 9, nanoporous aerogel 12, inner vacuum layer 5, and outer vacuum layer 3 form a composite thermal insulation barrier. The getter tablets 8 are activated at room temperature and continuously adsorb active gases, thus extending the life of the vacuum layer. Low-temperature fluid is transported through the fluid delivery pipe 6. The support component 7 improves the strength of the vacuum sleeve and reduces heat leakage and temperature loss.

[0027] The components of this utility model are: 1. Insulating sleeve; 2. Vacuum port; 3. Outer vacuum layer; 4. Isolation tube; 5. Inner vacuum layer; 6. Fluid delivery tube; 7. Support component; 8. Getter sheet; 9. Insulation board; 10. Sealing plate; 11. Connecting hole; 12. Nanoporous aerogel; 13. Outer insulation layer; 14. Inner insulation layer; 15. Radiation reflector plate; 16. Filter screen. All components are general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods. The problem solved by this utility model is that existing low-temperature pipeline vacuum isolation structures are mostly single-layer vacuum sandwich designs. While conventional methods can reduce gas heat transfer, they struggle to effectively block radiative heat transfer and the heat conduction of solid support structures. This invention addresses this issue through the combination of the aforementioned components. The outer vacuum layer 3 and the inner vacuum layer 5 work synergistically. The outer vacuum layer 3 isolates ambient heat sources, while the inner vacuum layer 5, filled with nanoporous aerogel 12, simultaneously suppresses gas conduction, solid heat conduction, and radiative heat transfer. The corrugated aluminum foil radiation reflector 15 divides the insulation layer into multiple chambers, increasing reflectivity and reducing the proportion of radiative heat transfer. The inverted V-shaped support 7, made of low-thermal-conductivity silicon nitride ceramic, has a small contact area, reducing heat leakage compared to traditional metal supports and improving insulation performance. The above description illustrates the basic principles, main features, and advantages of this invention. It is obvious to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0028] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A low-temperature pipeline vacuum isolation structure, comprising an insulation sleeve (1) and a fluid delivery pipe (6), characterized in that: The fluid delivery pipe (6) is placed inside the insulation sleeve (1). A partition pipe (4) is provided between the insulation sleeve (1) and the fluid delivery pipe (6). The ends of the insulation sleeve (1) and the partition pipe (4) are fixedly connected by a sealing plate (10). The fluid delivery pipe (6) passes through the sealing plate (10) and the outer wall of the fluid delivery pipe (6) is sealed with the sealing plate (10). A vacuum port (2) is installed on the outer wall of the insulation sleeve (1). An outer vacuum layer (3) is formed between the insulation sleeve (1) and the partition pipe (4). An inner vacuum layer (5) is formed between the partition pipe (4) and the fluid delivery pipe (6). A connection hole (11) is opened on the surface of the partition pipe (4) and the two ends of the connection hole (11) are connected to the outer vacuum layer (3) and the inner vacuum layer (5) respectively. A filter screen (16) is installed in the connection hole (11).

2. The cryogenic pipeline vacuum isolation structure according to claim 1, characterized in that: The surface of the fluid delivery pipe (6) and the inner insulation layer (14) are surrounded by an insulation board (9), and a plurality of radiation reflectors (15) are installed inside the insulation board (9).

3. The cryogenic pipeline vacuum isolation structure according to claim 2, characterized in that: The radiation reflector (15) has a corrugated structure and is made of aluminum foil. The insulation board (9) is divided into an inner insulation layer (14) and an outer insulation layer (13) by the radiation reflector (15). The outer insulation layer (13) is filled with glass fiber.

4. The cryogenic pipeline vacuum isolation structure according to claim 1, characterized in that: The outer wall of the partition tube (4) and located in the outer vacuum layer (3) are fitted with a number of getter sheets (8), which are in the form of a ring and are evenly distributed.

5. The cryogenic pipeline vacuum isolation structure according to claim 1, characterized in that: Inside the outer vacuum layer (3) and between two adjacent getter sheets (8), there are several support members (7). The support members (7) are in an inverted V-shaped structure and the upper end of the support members (7) is attached to the inner wall of the insulation sleeve (1). The lower end of the support members (7) is fixedly connected to the outer wall of the partition tube (4). The support members (7) are made of silicon nitride ceramic material.

6. The cryogenic pipeline vacuum isolation structure according to claim 1, characterized in that: The inner vacuum layer (5) is filled with nanoporous aerogel (12).

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