Cold leakage prevention vacuum nipple

Abstract

The utility model discloses an anti-cold-leakage vacuum nipple, which comprises an inner layer pipeline, an outer layer pipeline, a heat insulation material and sealing assemblies, the outer layer pipeline is sleeved on the outer side of the middle part of the inner layer pipeline, the heat insulation material is positioned between the inner layer pipeline and the outer layer pipeline, and the sealing assemblies are arranged at two interfaces of the inner layer pipeline and the outer layer pipeline. Wherein the sealing assembly comprises a heat insulation plate of an annular structure, an inner connecting ring is fixedly embedded in the inner edge of the heat insulation plate, and the space between the inner-layer pipeline and the outer-layer pipeline is filled with polyurethane foam or polystyrene foam materials, so that heat transfer can be effectively reduced, and the heat insulation effect is improved; and the vacuum cavity formed among the inner-layer pipeline, the outer-layer pipeline and the sealing assembly is filled with the heat insulation material, heat transfer can be further reduced, good heat insulation performance is provided, freezing, frosting and corrosion of the outer surface of the cold box are prevented, the service life of equipment is prolonged, and maintenance and replacement cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air separation equipment, in particular to an anti-cold-leakage vacuum short section. Background Technique

[0002] An air separation device is a device used to separate and purify the components in a mixed gas, and is mainly applied to industries such as gas manufacturing, oil refining, chemical engineering, and medicine in the industrial field. With the development of industry, the demand for high-purity liquid components and the like increases. In an air separation device, when low-temperature liquid components enter and exit the cold box, due to the insufficient heat insulation performance of the pipe passing through the cold box wall, the cold quantity will conduct from the inside of the pipe to the outside, resulting in a decrease in the temperature of the cold box wall plate near the pipe, increasing the possibility of frosting on the pipe and the cold box wall plate. When frosting occurs on the wall, the frost layer or water film will keep the pipe surface in a wet state continuously. The long-term wet environment is likely to cause corrosion and damage to the pipe and the cold box panel. Corrosion and damage may lead to leakage or rupture of the pipe and the cold box panel, further affecting the reliability and safety of the system. Wall frosting will increase the difficulty and cost of system maintenance. Removing the frost or water film on the pipe and the cold box surface requires extra work and time. Regular cleaning and maintenance of the device to prevent frosting may require a more frequent maintenance plan and resource investment;

[0003] Chinese Patent Publication No. CN204986063U discloses a vacuum tube and a vacuum device, which includes an outer tube, an inner tube, a vacuum valve and a connecting pipe. The inner tube is located inside the outer tube. The connecting pipe connects the outer tube and the inner tube. The vacuum valve is located on the connecting pipe. The vacuum valve is used to control the vacuum degree of the gap between the inner wall of the outer tube and the outer wall of the inner tube through the connecting pipe. Therefore, this vacuum tube will not have contact heat transfer with the outside world to ensure that the temperature inside the vacuum tube will not be affected by the external environment. According to the state equation of ideal gas PV=nRT, since the temperature inside the vacuum tube remains unchanged, the pressure inside the vacuum tube will not change either, so as to achieve the purpose of stabilizing the pressure, that is, the vacuum degree is stable;

[0004] In the above technology, the inner tube is located inside the outer tube, and the connecting pipe connects the outer tube and the inner tube. However, there is a strong heat transfer effect between the connecting pipe, the outer tube and the inner tube, which results in poor heat insulation ability of the vacuum tube. Therefore, the utility model discloses an anti-cold-leakage vacuum short section to solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide an anti-cold-leakage vacuum short section to solve the problem that there is a strong heat transfer effect between the connecting pipe, the outer tube and the inner tube of the traditional vacuum tube in the above background technology, which results in poor heat insulation ability of the vacuum tube.

[0006] To achieve the above purpose, the solution of the utility model to solve the above technical problems is as follows:

[0007] A cold-proof vacuum short joint, comprising an inner layer pipe, an outer layer pipe, heat insulation material and a sealing assembly. The middle part of the outer side of the inner layer pipe is sleeved with the outer layer pipe. The heat insulation material is located between the inner layer pipe and the outer layer pipe. Sealing assemblies are installed at both interfaces of the inner layer pipe and the outer layer pipe.

[0008] Among them, the sealing assembly includes a heat insulation board in a ring structure. An inner connection ring is fixedly embedded at the inner edge of the heat insulation board. An outer connection ring is fixedly embedded at the outer edge of the heat insulation board. The inner connection ring is threadedly connected to the inner layer pipe. The outer connection ring is threadedly connected to the outer layer pipe.

[0009] As a further scheme of the utility model, the heat insulation board is made of bakelite board material, and the inner connection ring, the outer connection ring and the heat insulation board are fixedly bonded into an integral structure.

[0010] As a further scheme of the utility model, blocking rings are fixedly welded to the outer walls at both ends of the inner layer pipe. External threads are correspondingly provided on the outer walls of the inner layer pipe beside the blocking rings for the inner connection rings.

[0011] As a further scheme of the utility model, inner concave rings are provided on both side end faces of the outer layer pipe. Internal threads are provided on the circumferential walls of the inner concave rings for the outer connection rings.

[0012] As a further scheme of the utility model, the sealing assembly further includes an inner sealing ring and an outer sealing ring. The inner sealing ring is clamped between the blocking ring and the heat insulation board. The outer sealing ring is clamped between the inner concave ring and the heat insulation board.

[0013] As a further scheme of the utility model, the heat insulation material is filled in the vacuum cavity formed between the inner layer pipe, the outer layer pipe and the heat insulation board, and the heat insulation material is made of polyurethane foam or polystyrene foam.

[0014] As a further scheme of the utility model, a flange is fixedly welded to the outer side of the outer layer pipe, and a vacuum extraction pipe is fixedly embedded on one side of the outer layer pipe. A one-way valve is installed in the vacuum extraction pipe.

[0015] As a further scheme of the utility model, any one of epoxy paint, peroxyethylene paint or urethane paint is coated on the inner wall of the inner layer pipe.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The anti-cold-running vacuum stub, by filling polyurethane foam or polystyrene foam material between the inner pipe and the outer pipe, can effectively reduce heat transfer, improve the heat insulation effect, and filling heat-insulating material in the vacuum cavity formed between the inner pipe, the outer pipe and the sealing assembly can further reduce heat transfer, providing good heat insulation performance, preventing the outer surface of the cold box from freezing, frosting and corroding, prolonging the service life of the equipment, and reducing the maintenance and replacement costs;

[0018] 2. For the anti-cold-running vacuum stub, both the inner pipe and the outer pipe are threadedly connected to the heat-insulating board, and with the inner sealing ring and the outer sealing ring, double sealing is provided, which can prevent the leakage of the vacuum cavity, ensuring the heat insulation ability, and the phenolic board can block the contact heat transfer between the inner pipe and the outer pipe. Compared with the traditional integral vacuum stub, the heat insulation effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0020] Figure 1 is a perspective view of an anti-cold-running vacuum stub of the present utility model;

[0021] Figure 2 is a side sectional view of an anti-cold-running vacuum stub of the present utility model;

[0022] Figure 3 is an enlarged view of the structure at A in an anti-cold-running vacuum stub of the present utility model Figure 2 ;

[0023] Figure 4 is a partial structure diagram of the inner pipe in an anti-cold-running vacuum stub of the present utility model;

[0024] Figure 5 is a structure diagram of the outer pipe in an anti-cold-running vacuum stub of the present utility model;

[0025] Figure 6 is a front view of an anti-cold-running vacuum stub of the present utility model.

[0026] In the drawings, the list of components represented by each reference numeral is as follows: 1, inner pipe; 2, outer pipe; 3, heat-insulating material; 4, sealing assembly; 11, retaining ring; 12, external thread; 21, inner concave ring; 22, internal thread; 23, flange; 24, evacuation pipe; 25, check valve; 41, heat-insulating board; 42, inner connecting ring; 43, outer connecting ring; 44, inner sealing ring; 45, outer sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present utility model will be further described below in conjunction with the embodiments.

[0028] Please refer to Figures 1-6 , this utility model provides an anti-cold-running vacuum stub, which includes an inner layer pipe 1, an outer layer pipe 2, a heat-insulating material 3 and a sealing assembly 4. A vacuum extraction pipe 24 is fixedly embedded on one side of the outer layer pipe 2, and a one-way valve 25 is installed in the vacuum extraction pipe 24;

[0029] Specifically, connect the vacuum extraction pipe 24 to an external vacuum pump. Starting the vacuum pump can extract air, and a vacuum cavity can be formed between the inner layer pipe 1, the outer layer pipe 2 and the sealing assembly 4. Since heat conduction is mainly transmitted through molecular collisions, the anti-cold-running vacuum stub can effectively isolate the heat transfer of the connection part. The one-way valve 25 is used to prevent the anti-cold-running vacuum stub from leaking after the vacuum extraction pipe 24 is separated from the vacuum pump.

[0030] Furthermore, a flange 23 is fixedly welded on the outer side of the outer layer pipe 2;

[0031] Specifically, the flange 23 is fixed to the air separation equipment with screws, which can be used to support and fix the entire anti-cold-running vacuum stub to maintain its stability and safety;

[0032] Furthermore, the outer layer pipe 2 is sleeved on the outer side of the middle part of the inner layer pipe 1, and any one of epoxy paint, peroxyethylene paint or urethane paint is coated on the inner wall of the inner layer pipe 1;

[0033] Specifically, epoxy paint, peroxyethylene paint and urethane paint can all resist acid and alkali corrosion, and the inner layer pipe 1, the outer layer pipe 2, the inner connecting ring 42 and the outer connecting ring 43 are all made of stainless steel or nickel-based alloy materials, which are not easy to rust and extend the service life of the equipment

[0034] Furthermore, the heat-insulating material 3 is located between the inner layer pipe 1 and the outer layer pipe 2. The heat-insulating material 3 is filled in the vacuum cavity formed between the inner layer pipe 1, the outer layer pipe 2 and the heat-insulating board 41, and the heat-insulating material 3 is made of polyurethane foam or polystyrene foam;

[0035] Specifically, polyurethane foam or polystyrene foam is filled in a vacuum environment, which can reduce heat conduction and thermal radiation and improve the heat insulation ability of the anti-cold-running vacuum stub;

[0036] Furthermore, a sealing assembly 4 is installed at both interfaces of the inner layer pipe 1 and the outer layer pipe 2. The sealing assembly 4 includes a heat-insulating board 41 in a ring structure;

[0037] Specifically, the heat-insulating board 41 is located between the inner layer pipe 1 and the outer layer pipe 2, which plays a role in supporting and connecting the inner layer pipe 1 and the outer layer pipe 2, reduces the heat conduction effect, reduces the energy loss, and improves the heat preservation ability of the anti-cold-running vacuum stub.

[0038] Further, an inner connection ring 42 is fixedly embedded at the inner edge of the heat insulation plate 41. The inner connection ring 42 is threadedly connected to the inner layer pipe 1. At both ends of the outer wall of the inner layer pipe 1, retaining rings 11 are fixedly welded. External threads 12 are correspondingly provided on the outer wall of the inner layer pipe 1 beside the retaining rings 11 and corresponding to the inner connection ring 42.

[0039] Specifically, the threaded structure of the inner connection ring 42 is in threaded cooperation with the external threads 12, which can prevent the inner connection ring 42 from shifting, and the assembly is fast. The retaining ring 11 plays a limiting role, enabling the inner connection ring 42 to be accurately positioned, and the retaining ring 11 and the inner connection ring 42 together play a role in pressing the inner sealing ring 44.

[0040] Further, an outer connection ring 43 is fixedly embedded at the outer edge of the heat insulation plate 41. The outer connection ring 43 is threadedly connected to the outer layer pipe 2. Inner concave rings 21 are provided on both side end faces of the outer layer pipe 2. Internal threads 22 are provided on the peripheral wall of the inner concave ring 21 corresponding to the outer connection ring 43.

[0041] Specifically, the threaded structure of the outer connection ring 43 is in threaded cooperation with the internal threads 22, which can prevent the outer connection ring 43 from shifting, and the assembly is fast.

[0042] Further, the sealing assembly 4 further includes an inner sealing ring 44 and an outer sealing ring 45. The inner sealing ring 44 is clamped between the retaining ring 11 and the heat insulation plate 41, and the outer sealing ring 45 is clamped between the inner concave ring 21 and the heat insulation plate 41.

[0043] Specifically, both the inner sealing ring 44 and the outer sealing ring 45 are O-rings made of silicone material, and the two are pressed in the connection gap to ensure that the cold insulation vacuum short joint does not leak.

[0044] Further, the heat insulation plate 41 is made of phenolic plywood material, and the inner connection ring 42, the outer connection ring 43 and the heat insulation plate 41 are adhesively fixed into an integral structure.

[0045] Specifically, the phenolic plywood has excellent heat insulation performance. Compared with using metal materials to support and connect the inner layer pipe 1 and the outer layer pipe 2, the thermal resistance effect is remarkable.

[0046] Working principle: When in use, first sleeved the outer pipe 2 on the outside of the inner pipe 1. Then, place the outer sealing ring 45 in the inner concave ring 21. After placing the inner sealing ring 44 on one side of the retaining ring 11, screw and install one of the heat insulation plates 41 to the interface between the inner pipe 1 and the outer pipe 2. Then, fill the open interface between the inner pipe 1 and the outer pipe 2 with the heat insulation material 3. After filling the heat insulation material 3, screw the other heat insulation plate 41 to the interface between the inner pipe 1 and the outer pipe 2. After that, connect the vacuum extraction pipe 24 to an external vacuum pump, and start the vacuum pump to extract air, so as to form a vacuum cavity between the inner pipe 1, the outer pipe 2 and the sealing assembly 4, improving its heat insulation ability.

Claims

1. A cold-insulation-proof vacuum stub, characterized in that It includes an inner layer pipe (1), an outer layer pipe (2), a heat insulation material (3) and a sealing assembly (4). The outer side of the middle part of the inner layer pipe (1) is sleeved with the outer layer pipe (2). The heat insulation material (3) is located between the inner layer pipe (1) and the outer layer pipe (2). Sealing assemblies (4) are installed at both interfaces of the inner layer pipe (1) and the outer layer pipe (2). Among them, the sealing assembly (4) includes a heat insulation board (41) in a ring structure. An inner connection ring (42) is fixedly embedded at the inner edge of the heat insulation board (41). An outer connection ring (43) is fixedly embedded at the outer edge of the heat insulation board (41). The inner connection ring (42) is threadedly connected to the inner layer pipe (1), and the outer connection ring (43) is threadedly connected to the outer layer pipe (2).

2. The anti-cold-leakage vacuum stub according to claim 1, wherein: The heat insulation board (41) is made of bakelite board material, and the inner connection ring (42), the outer connection ring (43) and the heat insulation board (41) are fixedly bonded into an integral structure.

3. The anti-cold-leak vacuum stub according to claim 1, wherein: Blocking rings (11) are fixedly welded to the outer walls at both ends of the inner layer pipe (1). External threads (12) are correspondingly provided on the outer walls of the inner layer pipe (1) beside the blocking rings (11) for the inner connection rings (42).

4. The anti-cold-leakage vacuum stub according to claim 1, characterized in that: Inner concave rings (21) are provided on both side end faces of the outer layer pipe (2). Internal threads (22) are provided on the peripheral walls of the inner concave rings (21) for the outer connection rings (43).

5. The anti-cold-running vacuum stub according to claim 1, characterized in that: The sealing assembly (4) further includes an inner sealing ring (44) and an outer sealing ring (45). The inner sealing ring (44) is clamped between the blocking ring (11) and the heat insulation board (41), and the outer sealing ring (45) is clamped between the inner concave ring (21) and the heat insulation board (41).

6. The anti-cold-running vacuum stub according to claim 1, wherein: The heat insulation material (3) is filled in the vacuum cavity formed between the inner layer pipe (1), the outer layer pipe (2) and the heat insulation board (41), and the heat insulation material (3) is made of polyurethane foam or polystyrene foam.

7. The anti-cold-leak vacuum stub according to claim 1, wherein: A flange (23) is fixedly welded to the outer side of the outer layer pipe (2), and a vacuum extraction pipe (24) is fixedly embedded on one side of the outer layer pipe (2). A one-way valve (25) is installed in the vacuum extraction pipe (24).

8. A cold-insulation preventing vacuum stub according to claim 1, characterized in that: Any one of epoxy paint, peroxyethylene paint or urethane paint is coated on the inner wall of the inner layer pipe (1).

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