Cryogenic fluid circulation system

Abstract

The utility model relates to the technical field of refrigeration and low-temperature engineering, and provides a low-temperature fluid circulation system which comprises a cold source, a thermal load and a magnetic driver, the thermal load is connected with the cold source through a circulation pipeline, and the circulation pipeline is filled with low-temperature fluid media; the magnetic driver comprises an impeller, and the impeller is arranged in the circulating pipeline between the thermal load and the cold source and used for driving the low-temperature fluid medium to circularly flow in the circulating pipeline through rotation; according to the utility model, the circulating pipeline is arranged between the heat load and the cold source, and the heat transfer mode between the cold source and the load is changed from solid heat conduction in the prior art to convective heat transfer through circulating flow of low-temperature fluid in the circulating pipeline, so that the heat transfer effect is effectively enhanced; the cold energy is transferred to the heat load or the heat of the heat load is transferred to the cold source, so that the effect of reducing the temperature of the heat load is achieved, and the device is particularly suitable for occasions where the cold energy of the cold source is very small and long-distance cold energy transportation is needed below a liquid hydrogen temperature area.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of refrigeration and low temperature engineering, especially relates to a low temperature fluid circulation system. BACKGROUND

[0002] In the application of low temperature refrigeration system, such as space probe, the heat load (probe) and the cold source (such as refrigerator cold head) are directly fastened to connect to reduce the heat resistance between them as far as possible, but in some cases, there is a large distance between the probe and the cold source, and the two cannot be directly connected, and need to be connected by high thermal conductive copper strip, aluminum strip or copper braid to conduct heat in solid, at this time, due to the limitation of the thermal conductivity of the connecting material itself, the heat transfer capacity is still limited. SUMMARY

[0003] The utility model provides a low temperature fluid circulation system to solve the problem of poor solid heat conduction effect and limited application scene in prior art.

[0004] The utility model provides a low temperature fluid circulation system, comprising:

[0005] The cold source is connected with the heat load through the circulating pipeline, and the circulating pipeline is filled with low temperature fluid medium.

[0006] The heat load is connected with the cold source through the circulating pipeline, and the circulating pipeline is filled with low temperature fluid medium.

[0007] The magnetic drive includes an impeller, the impeller is arranged in the circulating pipeline between the heat load and the cold source, and is used for driving the low temperature fluid medium to circulate in the circulating pipeline by rotating.

[0008] According to the low temperature fluid circulation system provided by the utility model, the circulating pipeline includes a cold section, a hot section and an intermediate section, the cold section is arranged at the cold source, the hot section is arranged at the heat load, and the two ends of the intermediate section are connected with the hot section and the cold section respectively.

[0009] According to the low temperature fluid circulation system provided by the utility model, the circulating pipeline is a heat conductive metal pipe.

[0010] According to the low temperature fluid circulation system provided by the utility model, the cold section is arranged at the cold source in a continuous bending shape, and the hot section is arranged at the heat load in a continuous bending shape.

[0011] According to the low temperature fluid circulation system provided by the utility model, the magnetic drive further includes a magnetic coupling and a driving device, the magnetic coupling includes a first coupling and a second coupling, the driving device and the first coupling are arranged outside the circulating pipeline, and the driving device drives the first coupling to rotate through a first rotating shaft.

[0012] The second coupling and the impeller are arranged inside the circulation pipeline. The second coupling is connected to the impeller through a second rotating shaft. When the first coupling rotates, the second coupling can be driven to rotate by magnetic force to drive the impeller to rotate.

[0013] According to the low-temperature fluid circulation system provided by the present invention, the first coupling and the second coupling are coaxially arranged opposite to each other and have the same cross-sectional area.

[0014] According to the low-temperature fluid circulation system provided by the present invention, a groove is axially provided at the center of one end of the first coupling, the second coupling is coaxially arranged with the first coupling, and the second coupling is embedded in the groove.

[0015] According to the low-temperature fluid circulation system provided by the present invention, a support member is provided in the circulation pipeline, a bearing is provided on the support member, and the second rotating shaft is rotatably connected to the support member through the bearing.

[0016] According to the low-temperature fluid circulation system provided by the utility model, a heat insulating layer is provided on the outer side of the middle section.

[0017] According to the low-temperature fluid circulation system provided by the present invention, the outer sides of the cold source and the heat load are covered with a heat insulating layer.

[0018] The utility model provides a low-temperature fluid circulation system, comprising: a cold source, a heat load and a magnetic drive, wherein the heat load and the cold source are connected via a circulation pipeline, and the circulation pipeline is filled with a low-temperature fluid medium; the magnetic drive comprises an impeller, which is arranged in the circulation pipeline between the heat load and the cold source, and is used to drive the low-temperature fluid medium to circulate in the circulation pipeline by rotation; with such an arrangement, the utility model sets a circulation pipeline between the heat load and the cold source, and changes the heat transfer mode between the cold source and the load from solid heat conduction in the prior art to convection heat exchange through the circulation flow of the low-temperature fluid in the circulation pipeline, thereby effectively enhancing the heat transfer effect, realizing the transfer of cold energy to the heat load or the transfer of heat from the heat load to the cold source, so as to achieve the effect of reducing the temperature of the heat load, and is particularly suitable for occasions where the cold energy of the cold source below the liquid hydrogen temperature range is very small and the cold energy needs to be transported over long distances. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1is a structural schematic diagram of a low-temperature fluid circulation system provided by the embodiment of the present application.

[0021] Figure 2 is a structural schematic diagram of a magnetic driver provided by the embodiment of the present application.

[0022] Figure 3 is a structural schematic diagram of a magnetic driver provided by another embodiment of the present application.

[0023] Reference signs:

[0024] 1, cold source; 2, heat load; 3, magnetic driver; 31, first coupling; 32, second coupling; 33, first rotating shaft; 34, second rotating shaft; 35, support; 36, bearing;

[0025] 4, impeller; 5, cold section; 6, hot section; 7, intermediate section; 8, heat insulation layer. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0027] The low-temperature fluid circulation system of the present application will be described below in combination with Figures 1-3

[0028] The embodiment provides a low-temperature fluid circulation system, which comprises a cold source 1, a heat load 2 and a magnetic driver 3.

[0029] The heat load 2 is connected with the cold source 1 through a circulating pipeline, and the circulating pipeline is filled with a low-temperature fluid medium; the magnetic driver 3 comprises an impeller 4, the impeller 4 is arranged in the circulating pipeline between the heat load 2 and the cold source 1, and is used for driving the low-temperature fluid medium to circulate and flow in the circulating pipeline through rotation.

[0030] ​It can be known from the above scheme that the circulating pipeline is arranged between the heat load 2 and the cold source 1, the heat transfer mode between the cold source 1 and the load is changed from the solid heat conduction in the prior art to the convection heat exchange through the circulating flow of the low-temperature fluid in the circulating pipeline, the heat transfer effect is effectively enhanced, the cold quantity is transmitted to the heat load 2 or the heat quantity of the heat load 2 is transmitted to the cold source 1, the effect of reducing the temperature of the heat load 2 is achieved, and the utility model is particularly suitable for the liquid hydrogen temperature zone, i.e. the hydrogen liquefaction temperature below 20K-253.15 DEG C, the cold quantity of the cold source 1 is very small, the cold quantity needs to be transported for a long distance, the problem that the cold quantity cannot be transmitted to the heat load 2 due to the small refrigeration quantity of the refrigerator, the long distance and the large thermal resistance does not occur.

[0031] In some embodiments, the circulating pipeline is a heat-conducting metal pipe, and a metal with high thermal conductivity such as copper can be used.

[0032] Optionally, the low-temperature fluid medium is low-temperature helium. The boiling point of helium is about -268.93 DEG C at standard atmospheric pressure, and it is a very effective cooling medium. It can still maintain good fluidity and thermal conductivity at very low temperatures, so it can work at very low temperatures. Helium is an inert gas and is not easy to chemically react with other substances, so it is relatively safe during use.

[0033] In this embodiment, the circulating pipeline includes a cold section 5, a hot section 6 and an intermediate section 7. The cold section 5 is arranged at the cold source 1, the hot section 6 is arranged at the heat load 2, and the two ends of the intermediate section 7 are connected with the hot section 6 and the cold section 5 respectively.

[0034] In this embodiment, the outer side of the intermediate section 7 is provided with a heat insulation layer 8, and the outer sides of the cold source 1 and the heat load 2 are covered with the heat insulation layer 8. The heat insulation layer 8 is made of a material with low thermal conductivity and high reflectivity, for example, multilayer insulation, which is a high-efficiency thermal insulation material composed of multiple thin layers, usually including a reflective layer and a thermal insulation layer. The reflective layer is generally made of aluminum foil or other high-reflectivity materials, and the thermal insulation layer is a non-heat-conducting material (such as polyester film), which can effectively reduce heat transfer and prevent external heat from entering the low-temperature fluid circulation system.

[0035] As a preferred, the cold section 5 is arranged in a continuous bending shape at the cold source 1, and the hot section 6 is arranged in a continuous bending shape at the heat load 2.

[0036] In this way, the contact area of the cold section 5 and the cold source 1 and the contact area of the hot section 6 and the heat load 2 can be increased, thereby improving the heat exchange efficiency. In addition, the continuous bending can also optimize the spatial layout, especially in the case of limited space, this design can make more effective use of space. In addition, the bending design can also help to reduce the pressure loss of the fluid in the pipeline and improve the overall performance of the system.

[0037] In the embodiment, the magnetic driver 3 further comprises a magnetic coupling and a driving device, the driving device can be a motor, the magnetic coupling comprises a first coupling 31 and a second coupling 32, the driving device and the first coupling 31 are arranged outside the circulating pipeline, the driving device drives the first coupling 31 to rotate through a first rotating shaft 33; the second coupling 32 and the impeller 4 are arranged inside the circulating pipeline, the second coupling 32 is connected with the impeller 4 through a second rotating shaft 34, when the first coupling 31 rotates, the second coupling 32 can be driven to rotate through magnetic force, so as to drive the impeller 4 to rotate.

[0038] In this way, the magnetic driver 3 realizes non-contact transmission of power through the magnetic coupling, so that there is no direct physical connection between the driving device and the impeller 4 inside the circulating pipeline, thereby avoiding the leakage problem that may be caused by the traditional mechanical seal, especially when handling flammable, explosive or toxic fluids, which is more important, and improving the sealing performance of the system. Since there is no direct physical connection, it is not necessary to frequently replace the vulnerable parts such as mechanical seals, and the equipment downtime caused by mechanical failure or wear is also reduced, the maintenance cost is reduced, and the service life of the equipment is prolonged; the magnetic driver 3 can efficiently convert the mechanical energy generated by the driving device such as a motor into kinetic energy for rotating the impeller 4. Since the efficiency and stability of magnetic transmission are relatively high, the energy loss is relatively small, and the magnetic driver 3 can adapt to various harsh working environments, such as high temperature, high pressure, corrosive fluid, etc. The magnetic transmission is not affected by these environmental factors, thereby ensuring the stable operation of the equipment.

[0039] As shown in Figure 1 , the first coupling 31 and the driving device such as a motor are arranged outside the heat insulation layer 8, so that the heat generated by the driving device is outside the shielding layer, which will not increase the thermal load of the refrigeration system, and can effectively solve the leakage problem of the working medium inside the loop.

[0040] In some embodiments, the first coupling 31 and the second coupling 32 are coaxially arranged and have the same cross-sectional area, as shown in Figure 2 , the first coupling 31 and the second coupling 32 are both disc-shaped, coaxially arranged, and have the same size of the opposite end face area, the first coupling 31 is driven by the motor outside the pipe of the middle section 7 and is the driving part, the second coupling 32 is connected with the impeller 4 inside the pipe of the middle section 7 and is the driven part, when the first coupling 31 rotates, the second coupling 32 is driven to rotate through magnetic force, and the magnetic connection strength can be improved by increasing the relative area between the two couplings to ensure the reliability of driving the impeller 4.

[0041] In other embodiments, a circular groove is arranged at the center of one end of the first coupling 31 in the axial direction, the second coupling 32 is coaxially arranged with the first coupling 31, and the second coupling 32 can be embedded in the circular groove and rotate with it. As shown in Figure 3As shown, the first coupling 31 and the second coupling 32 are both cylindrical, coaxially arranged, a circular groove is formed in the center of the end of the first coupling 31, so that part of the second coupling 32 is embedded in the circular groove in the axial direction and can rotate around the axis in the circular groove, so that the magnetic coupling forms a cladding structure, at this time, the pipe wall shape of the intermediate section 7 between the first coupling 31 and the second coupling 32 needs to be designed to be the shape that matches the circular groove. When working, the first coupling 31 is driven by the motor outside the pipe of the intermediate section 7 and is the driving part, the second coupling 32 is connected with the impeller 4 inside the pipe of the intermediate section 7 and is the driven part, the first coupling 31 drives the second coupling 32 and the impeller 4 to rotate through magnetic force when rotating.

[0042] Preferably, in order to ensure the strength of the magnetic connection, the axial length of the second coupling 32 can be increased, so that the side area is large enough, thereby increasing the corresponding area between the first coupling 31 and the second coupling 32 to improve the strength of the magnetic connection, so as to ensure the reliability of driving the impeller 4.

[0043] In the embodiment, a support 35 is further arranged in the pipe of the intermediate section 7, the support 35 is provided with a bearing 36, and the second rotating shaft 34 is rotationally connected with the support 35 through the bearing 36.

[0044] In this way, the second rotating shaft 34 is fixed by adopting the support 35, so that the rotation of the second rotating shaft 34 and the impeller 4 is stable and reliable.

[0045] In the description of the embodiments of the present application, it should be pointed out that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0046] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "way", "specific way", or "some ways" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or way are included in at least one embodiment or way of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or way. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or ways in a suitable way. In addition, those skilled in the art can combine and combine the different embodiments or characteristics of the different embodiments or ways described in the present application without contradiction.

[0047] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, but not limited to; although the present application is described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still be modified to the technical solutions recorded in the foregoing examples, or part of the technical features are replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A low-temperature fluid circulation system, characterized in that: include: Cold source (1); A heat load (2), the heat load (2) being connected to the cold source (1) via a circulation pipeline, the circulation pipeline being filled with a low-temperature fluid medium; A magnetic drive (3) includes an impeller (4), wherein the impeller (4) is arranged in a circulation pipeline between the heat load (2) and the cold source (1), and is used to drive the low-temperature fluid medium to circulate in the circulation pipeline by rotation.

2. The cryogenic fluid circulation system according to claim 1, characterized in that: The circulation pipeline comprises a cold section (5), a hot section (6) and an intermediate section (7); the cold section (5) is arranged at the cold source (1); the hot section (6) is arranged at the heat load (2); and both ends of the intermediate section (7) are connected to the hot section (6) and the cold section (5) respectively.

3. The cryogenic fluid circulation system according to claim 1, wherein: The circulation pipeline is a heat-conducting metal pipe.

4. The cryogenic fluid circulation system according to claim 2, characterized in that: The cold section (5) is arranged at the cold source (1) in a continuous bending shape, and the hot section (6) is arranged at the heat load (2) in a continuous bending shape.

5. The cryogenic fluid circulation system according to claim 1, characterized in that: The magnetic drive (3) further comprises a magnetic coupling and a driving device, wherein the magnetic coupling comprises a first coupling (31) and a second coupling (32), the driving device and the first coupling (31) are arranged outside the circulation pipeline, and the driving device drives the first coupling (31) to rotate via a first rotating shaft (33); The second coupling (32) and the impeller (4) are arranged inside the circulation pipeline. The second coupling (32) is connected to the impeller (4) via a second rotating shaft (34). When the first coupling (31) rotates, the second coupling (32) can be driven to rotate by magnetic force, thereby driving the impeller (4) to rotate.

6. The cryogenic fluid circulation system according to claim 5, characterized in that: The first coupling (31) and the second coupling (32) are coaxially arranged opposite to each other and have the same cross-sectional area.

7. The cryogenic fluid circulation system according to claim 5, characterized in that: A circular groove is axially arranged at the center of one end of the first coupling (31); the second coupling (32) is coaxially arranged with the first coupling (31), and the second coupling (32) can be embedded in the circular groove and rotatably engaged therewith.

8. The cryogenic fluid circulation system according to claim 5, characterized in that: A support member (35) is provided in the circulation pipeline, a bearing (36) is provided on the support member (35), and the second rotating shaft (34) is rotatably connected to the support member (35) via the bearing (36).

9. The cryogenic fluid circulation system according to claim 2, characterized in that: A heat insulating layer (8) is provided on the outer side of the middle section (7).

10. The cryogenic fluid circulation system according to claim 2, wherein: The outer sides of the cold source (1) and the heat load (2) are covered with a heat insulating layer (8).

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