Multi-working-medium cascade low-temperature gravity assisted heat pipe cooling device

Abstract

The utility model relates to the technical field of low-temperature heat pipes, and provides a multi-working-medium cascade low-temperature gravity assisted heat pipe cooling device which comprises a plurality of sets of low-temperature gravity assisted heat pipes arranged in parallel, each set of low-temperature gravity assisted heat pipes is provided with an independent air inlet liquid filling system, and the multiple sets of low-temperature gravity assisted heat pipes share a condensation section and an evaporation section. Working media of different two-phase temperature zones are adopted in the multiple sets of low-temperature gravity assisted heat pipes, the condensation section is used for making contact with a cold source, and the evaporation section is used for making contact with a cooled part. According to the multi-working-medium cascade low-temperature gravity assisted heat pipe cooling device, effective heat transfer of a wide temperature area is achieved in a parallel connection mode, each low-temperature gravity assisted heat pipe operates at the optimal working temperature, and therefore the continuous cooling effect from the room temperature area to the liquid nitrogen temperature area is achieved; and besides, the applicable temperature area of the same heat pipe system is greatly widened, additional components such as a wick and other heat exchangers do not need to be introduced, the stability and flexibility of the system are improved, and different cooling requirements can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to low temperature heat pipe technical field especially relates to a kind of multi-working substance cascade low temperature gravity heat pipe cooling device. BACKGROUND

[0002] Low temperature heat pipe technology is a kind of efficient heat transport technology, and gravity heat pipe is also called two-phase closed heat siphon heat pipe as a form of heat pipe, which is composed of evaporation section, adiabatic section and condensation section, without wick inside, and liquid returns by gravity. The working principle of gravity heat pipe is that working substance vaporizes by absorbing heat in evaporation section, vapor flows to condensation section under the action of pressure difference, and liquid returns to evaporation section along the inner wall by gravity, to realize heat transfer.

[0003] In the prior art, due to its unique two-phase flow heat transfer mechanism, the heat transfer capacity of heat pipe is better than that of high thermal conductivity copper with the same cross-sectional area, but the single working substance limits the application of low temperature heat pipe in wide temperature range, and a single low temperature heat pipe cannot be used to realize precooling in wide temperature range. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of multi-working substance cascade low temperature gravity heat pipe cooling device to solve the defect that single low temperature heat pipe cannot realize precooling in wide temperature range in prior art, to realize effective heat transfer in different temperature intervals in wide temperature range.

[0005] The utility model provides a kind of multi-working substance cascade low temperature gravity heat pipe cooling device, comprising:

[0006] A plurality of groups of low temperature gravity heat pipes are arranged in parallel, each group of low temperature gravity heat pipes has an independent air charging system, the plurality of groups of low temperature gravity heat pipes share a condensation section and an evaporation section, and different two-phase temperature zones of working substance are used in the plurality of groups of low temperature gravity heat pipes, the condensation section is used to contact with a cold source, and the evaporation section is used to contact with a cooled object.

[0007] According to the multi-working substance cascade low temperature gravity heat pipe cooling device provided by the utility model, the condensation section comprises a copper condensing plate.

[0008] According to the multi-working substance cascade low temperature gravity heat pipe cooling device provided by the utility model, the evaporation section comprises a copper evaporation plate.

[0009] According to the multi-working substance cascade low temperature gravity heat pipe cooling device provided by the utility model, three groups of low temperature gravity heat pipes are connected in parallel, and R134a working substance, liquid nitrogen working substance and liquid neon working substance are used in the three groups of low temperature gravity heat pipes respectively.

[0010] According to the multi-working medium cascade low-temperature gravity heat pipe cooling device, R22 or R134a is used as the working medium for pre-cooling under the temperature range of 250K-150K.

[0011] According to the multi-working medium cascade low-temperature gravity heat pipe cooling device, nitrogen or argon is used as the working medium for pre-cooling under the temperature range of 150K-80K.

[0012] According to the multi-working medium cascade low-temperature gravity heat pipe cooling device, each low-temperature gravity heat pipe comprises:

[0013] The first pipe section is integrally connected with the condensing section;

[0014] The second pipe section is arranged at one end of the first pipe section away from the condensing section;

[0015] The third pipe section is arranged at one end of the second pipe section away from the first pipe section, and the other end of the third pipe section is integrally connected with the evaporating section.

[0016] According to the multi-working medium cascade low-temperature gravity heat pipe cooling device, the first pipe section is a copper pipe, the second pipe section is a stainless steel pipe, and the third pipe section is a copper pipe.

[0017] According to the multi-working medium cascade low-temperature gravity heat pipe cooling device, the plurality of low-temperature gravity heat pipes are all circular pipes.

[0018] According to the multi-working medium cascade low-temperature gravity heat pipe cooling device, the diameters of the plurality of low-temperature gravity heat pipes are equal or different.

[0019] The multi-working medium cascade low-temperature gravity heat pipe cooling device provided by the utility model has the advantages that a plurality of groups of low-temperature gravity heat pipes are arranged in parallel, each group of low-temperature gravity heat pipes has an independent air inlet liquid filling system, the plurality of groups of low-temperature gravity heat pipes share a condensing section and an evaporating section, different working mediums in two-phase temperature zones are used in the plurality of groups of low-temperature gravity heat pipes, the condensing section is used for contacting a cold source, and the evaporating section is used for contacting a cooling piece; the optimal heat transfer characteristics of different working mediums in a specific range are utilized, effective heat transfer in a wide temperature zone is realized in a parallel mode, each low-temperature gravity heat pipe operates at the optimal working temperature, and therefore, continuous cooling effect from room temperature to the liquid nitrogen temperature zone is realized.

[0020] The multi-working medium cascade low-temperature gravity heat pipe cooling device provided by the utility model greatly widens the applicable temperature zone of the same heat pipe system, does not need to introduce additional components such as wicks and other heat exchangers, improves the stability and flexibility of the system, and can adapt to different cooling requirements. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0022] Fig. 1 It is a structural schematic view of the multi-working medium cascade low-temperature gravity heat pipe cooling device provided by the present application.

[0023] Fig. 2 It is a sectional view of the multi-working medium cascade low-temperature gravity heat pipe cooling device provided by the present application.

[0024] Reference signs:

[0025] 1, low-temperature gravity heat pipe; 2, condensing section; 3, evaporating section; 11, first pipe section; 12, second pipe section; 13, third pipe section. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present application more clear, the technical solutions in the present application will be described clearly and completely in combination with the drawings in the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0027] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0028] In the prior art, due to the unique two-phase flow heat transfer mechanism, the heat transfer capacity of the heat pipe is better than that of the high thermal conductivity metal copper with the same cross-sectional area, but the single working medium limits the wide temperature range application of the low temperature heat pipe, and the single low temperature heat pipe cannot realize the pre-cooling of the wide temperature range.

[0029] In view of the above technical problems, the following Figs. 1-2 The utility model discloses a kind of multi-working medium cascade low temperature gravity heat pipe cooling devices.

[0030] The utility model discloses a kind of multi-working medium cascade low temperature gravity heat pipe cooling devices, including the parallelly connected low temperature gravity heat pipe 1 of multiple groups, each low temperature gravity heat pipe 1 has independent air inlet liquid filling system, allow to carry out accurate working medium filling and pressure control to each low temperature gravity heat pipe 1.Multiple low temperature gravity heat pipe 1 share condensing section 2 and evaporation section 3, can ensure the stability of high-efficiency heat exchange and structure.Multiple low temperature gravity heat pipe 1 is in using different two-phase temperature range working medium, can allow system to use most suitable working medium in different temperature interval, to improve cooling efficiency and adaptability.Cooling section 2 is used to contact with cold source, and working medium in heat pipe is condensed into liquid by cooling section 2 through heat exchange.Cooling section 3 is used to contact with cooled piece, and working medium absorbs heat and vaporizes in cooling section 3, to realize cooling effect.

[0031] Among them, cold source is the starting point of providing cooling, and is usually the source of coolant or cooling liquid.Cooling section 2 contacts with cold source, and cooling section 2 is the condensing part of heat pipe, and in cooling section 2, vapor rising from evaporation section 3 liquefies and releases heat.Low temperature gravity heat pipe 1 contains working medium, and working medium absorbs heat and converts into vapor in evaporation section 3.

[0032] As Fig. 1 And Fig. 2 The utility model provides a kind of multi-working medium cascade low temperature gravity heat pipe cooling device provided by the utility model, which utilizes the optimal heat transfer characteristics of different working media within a specific range, realizes effective heat transfer in a wide temperature range through parallel connection, enables each low temperature gravity heat pipe to operate at its optimal working temperature, and thus achieves continuous cooling effect from room temperature to liquid nitrogen temperature range, covering a wider temperature range.

[0033] Independent air inlet liquid filling system makes the working medium filling and pressure control of each low temperature gravity heat pipe 1 more accurate, which helps to optimize heat exchange efficiency and system stability.Cooling section 2 and evaporation section 3 are shared, which simplifies the structure and ensures the efficiency of heat exchange.

[0034] The multi-working medium cascade low-temperature gravity heat pipe cooling device greatly widens the applicable temperature zone of the same heat pipe system, does not need to introduce additional components such as wicks, other heat exchangers and the like, improves the stability and flexibility of the system, and can adapt to different cooling requirements.

[0035] The multi-working medium cascade low-temperature gravity heat pipe cooling device provided by the utility model improves the energy recovery efficiency and overall efficiency of the system by optimizing the distribution of inter-stage heat exchangers. Not only is the cooling capacity improved, but also the energy loss of the system is reduced; the maximum cooling efficiency and cooling temperature difference can be achieved through multi-stage optimization, not only the same cooling temperature difference is achieved, but also the cooling efficiency and energy saving effect are greatly improved.

[0036] As shown in Fig. 1 and Fig. 2 In a feasible embodiment of the utility model, the condensing section 2 includes a copper condensing plate, and the evaporating section 3 includes a copper evaporating plate. The copper condensing plate can quickly transfer the cold energy provided by the cold source to the working medium in the low-temperature gravity heat pipe 1 to condense it. The copper evaporating plate can efficiently absorb heat from the cooled part and transfer it to the working medium in the low-temperature gravity heat pipe 1 to evaporate it.

[0037] It should be noted that the high thermal conductivity of copper helps to improve the heat exchange efficiency of the heat pipe. The thermal conductivity of copper is much higher than that of other commonly used metals. Under the same temperature gradient, copper can transfer more heat, which helps to speed up the condensation and evaporation process, thereby improving the heat exchange efficiency of the entire heat pipe cooling system. The use of copper material can reduce the thermal resistance in the heat exchange process, so that heat can be more smoothly transferred between the condensing section 2 and the evaporating section 3, which helps to maintain the stable operation of the system and reduce energy loss.

[0038] Therefore, using copper material to manufacture the condensing section 2 and the evaporating section 3 is an effective choice, which not only improves the heat exchange efficiency of the heat pipe, but also helps to enhance the structural stability and reliability of the system.

[0039] More specifically, in an embodiment of the utility model, three low-temperature gravity heat pipes 1 are connected in parallel, and R134a (tetrachloroethane) working medium, liquid nitrogen working medium and liquid neon working medium are used in the three low-temperature gravity heat pipes 1 respectively.

[0040] Among them, R134a is a commonly used low-temperature refrigerant with good thermophysical properties and chemical stability. It is suitable for heat exchange in the medium and low temperature zone and can provide stable cooling effect.

[0041] The boiling point of liquid nitrogen is very low (-196℃), which is suitable for heat exchange in the deep cooling area. When used as a working medium, liquid nitrogen can provide extremely high cooling efficiency, especially suitable for occasions requiring extremely low temperature.

[0042] The boiling point of liquid neon (-246℃) is slightly higher than that of liquid nitrogen, and it also belongs to cryogenic working medium. Liquid neon may have better performance than liquid nitrogen in some specific applications, such as certain low-temperature physical experiments or superconducting technology.

[0043] In the above embodiments, by using working media of different two-phase temperature zones (R134, liquid nitrogen, liquid neon), the cooling device in this embodiment can adapt to the cooling requirements of different temperature ranges, such as low-temperature physical experiments, superconducting technology, medical equipment, etc.

[0044] Furthermore, in the temperature range of 250K-150K, R22 (difluoromonochloromethane) or R134a (tetrachloroethane) is selected as the main pre-cooling working medium. In the temperature range of 150K-80K, liquid nitrogen or liquid argon is selected as the main pre-cooling working medium to achieve the effect of cooling high-thermal-mass objects such as superconducting magnets from room temperature to the liquid nitrogen temperature range.

[0045] In the above embodiments, the cascade cooling system connects different temperature low-temperature gravity heat pipes in parallel, so that each low-temperature gravity heat pipe operates at its optimal working temperature, thereby realizing continuous cooling from room temperature to the liquid nitrogen temperature range, and thus being called cascade cooling.

[0046] This embodiment is particularly suitable for applications that require efficient thermal management in different temperature ranges, such as spacecraft thermal control, superconducting magnet cooling, etc. The cascade cooling system can significantly reduce the cooling time and improve the cooling efficiency.

[0047] The cascade cooling system can achieve a refrigeration temperature as low as -170℃, significantly expanding the refrigeration temperature range of conventional systems. This capability makes the cascade cooling system have a significant advantage in applications requiring extremely low temperatures.

[0048] As shown in Fig. 1 and Fig. 2 In an embodiment of the present application, each low-temperature gravity heat pipe 1 includes a first pipe segment 11, a second pipe segment 12, and a third pipe segment 13.

[0049] The first pipe segment 11 is integrally connected with the condensing section 2, that is, the first pipe segment 11 and the condensing section 2 are both made of copper material. The integrated connection mode is crucial for improving heat transfer efficiency, reducing energy loss during heat transfer, and ensuring efficient transfer of heat from the condensing section 2 to the first pipe segment 11, thereby enhancing heat transfer efficiency.

[0050] The second pipe segment 12 is arranged at the end of the first pipe segment 11 away from the condensing section 2. The second pipe segment 12 needs to be thermally insulated from the outside environment. Therefore, the material of the second pipe segment 12 must be selected to prevent heat transfer from the inside of the heat pipe to the outside environment, thereby maintaining the temperature gradient of the working medium inside the heat pipe.

[0051] The third pipe section 13 is arranged at one end of the second pipe section 12 away from the first pipe section 11, and the other end of the third pipe section 13 is integrally connected with the evaporation section 3. Similar to the first pipe section 11, the third pipe section 13 ensures that heat can be transferred from the evaporation section 3 to the working medium inside the heat pipe, thereby enhancing the heat transfer efficiency.

[0052] Therefore, the embodiment of the present application achieves efficient heat transfer inside the heat pipe by arranging the first pipe section 11, the second pipe section 12, and the third pipe section 13, and maintains the working efficiency and stability of the heat pipe through heat insulation treatment.

[0053] More specifically, the first pipe section 11 is a copper pipe, the second pipe section 12 is a stainless steel pipe, and the third pipe section 13 is a copper pipe. The use of copper pipes for the first pipe section 11 and the third pipe section 13 maximizes the heat transfer efficiency from the condensation section 2 to the inside of the low-temperature gravity heat pipe 1. Stainless steel pipes have good corrosion resistance and mechanical strength, and the second pipe section 12, as the heat insulation part of the heat pipe, uses stainless steel pipes to maintain structural strength while reducing heat loss through appropriate heat insulation measures.

[0054] The first pipe section 11 is welded to the second pipe section 12, and the third pipe section 13 is welded to the second pipe section 12. Welding is a reliable connection method that can provide good sealing and structural strength. Through welding, the tight connection between the first pipe section 11, the second pipe section 12, and the third pipe section 13 can be ensured, reducing heat loss at the connection and improving the overall heat transfer efficiency of the heat pipe.

[0055] Therefore, the low-temperature gravity heat pipe 1 in the present application achieves optimization of structural strength, heat transfer efficiency, and corrosion resistance by using pipe sections made of different materials and welding connection methods. The first pipe section 11 and the third pipe section 13 use copper pipes to improve heat transfer efficiency, and the second pipe section 12 uses stainless steel pipes to provide corrosion resistance and mechanical strength. At the same time, the three pipe sections are connected by welding to ensure the overall performance and reliability of the heat pipe. This design has significant advantages in situations that require efficient heat transfer and long-term stable operation.

[0056] In a feasible embodiment of the present application, the plurality of low-temperature gravity heat pipes 1 are all circular pipes. Circular pipe-shaped heat pipes are convenient to manufacture, install, and maintain, and also help to improve heat transfer efficiency. Circular pipe-shaped heat pipes can evenly distribute heat, reducing heat accumulation on the pipe wall and thereby improving heat exchange efficiency.

[0057] Furthermore, the diameters of the multiple low-temperature gravity heat pipes 1 can be equal or unequal. If the diameters are equal, the low-temperature gravity heat pipes 1 will have consistency in heat transfer performance, structural strength, and material usage, which helps to simplify the design and manufacturing process. If the diameters are unequal, heat pipes with different diameters can be selected according to specific application requirements and heat transfer requirements. For example, in areas requiring higher heat transfer efficiency, larger-diameter heat pipes can be selected to increase the heat exchange area; while in areas with limited space or requiring reduced material usage, smaller-diameter heat pipes can be selected.

[0058] The present embodiment provides greater design flexibility by allowing the diameters of the low-temperature gravity heat pipes 1 to be equal or unequal, which helps to meet specific requirements and limitations in different application scenarios. The low-temperature gravity heat pipe cooling device in the present embodiment is suitable for a variety of application scenarios, including but not limited to low-temperature physical experiments, superconducting technology, medical equipment, aerospace, etc. By adjusting the diameters and numbers of the heat pipes, the heat transfer efficiency and structural strength of the system can be optimized to meet the requirements of different applications.

[0059] In summary, the multi-working fluid cascade low-temperature heat pipe cooling device provided by the present embodiment has multiple low-temperature gravity heat pipes with different working fluids connected in parallel, using the most suitable working fluid in different temperature ranges to achieve continuous cooling effect from room temperature to extremely low temperature.

[0060] In the description of the present embodiment, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present embodiment can be understood according to the specific circumstances.

[0061] In the description of the present embodiment, 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 embodiment. In the present specification, 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 manner. 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 specification without contradiction.

[0062] It should be finally pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been explained in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; 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 utility model.

Claims

1. A multi-working fluid cascade gravity heat pipe cooling device, characterized in that, The application relates to a low-temperature gravity heat pipe system. The condensing section (2) is used for contacting with a cold source, and the evaporating section (3) is used for contacting with a cooled part.

2. The multi-working fluid cascade gravity heat pipe cooling device according to claim 1, wherein, The condensing section (2) comprises a copper condensing plate.

3. The multi-working fluid cascade gravity heat pipe cooling device of claim 1, wherein, The evaporating section (3) comprises a copper evaporating plate.

4. The multi-working fluid cascade gravity heat pipe cooling device of claim 1, wherein, The low-temperature gravity heat pipe system comprises three groups of low-temperature gravity heat pipes (1) in parallel connection, and R134a working medium, liquid nitrogen working medium and liquid neon working medium are respectively used in the three groups of low-temperature gravity heat pipes (1).

5. The multi-working fluid cascade gravity heat pipe cooling device according to any one of claims 1-3, characterized in that, The low-temperature gravity heat pipe (1) uses R22 or R134a as pre-cooling working medium in a temperature range of 250K-150K.

6. The multi-working fluid cascade gravity heat pipe cooling device according to any one of claims 1-3, characterized in that, The low-temperature gravity heat pipe (1) uses nitrogen or argon as pre-cooling working medium in a temperature range of 150K-80K.

7. The multi-working fluid cascade gravity heat pipe cooling device of claim 1, wherein, Each low-temperature gravity heat pipe (1) comprises: A first pipe section (11) integrally connected with the condensing section (2); A second pipe section (12) arranged at one end of the first pipe section (11) away from the condensing section (2); A third pipe section (13) arranged at one end of the second pipe section (12) away from the first pipe section (11), and the other end of the third pipe section (13) integrally connected with the evaporating section (3).

8. The multi-working fluid cascade gravity heat pipe cooling device according to claim 7, wherein, The first pipe section (11) is a copper pipe, the second pipe section (12) is a stainless steel pipe, and the third pipe section (13) is a copper pipe.

9. The multi-working fluid cascade gravity heat pipe cooling device of claim 1, wherein, The low-temperature gravity heat pipes (1) are all circular pipes.

10. The multi-working fluid cascade gravity heat pipe cooling device according to claim 9, wherein, The diameters of the low-temperature gravity heat pipes (1) are equal or different.

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