CN215675977U - Cryogenic medicine cabinet based on gas expansion technology - Google Patents
Cryogenic medicine cabinet based on gas expansion technology Download PDFInfo
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- CN215675977U CN215675977U CN202120369391.XU CN202120369391U CN215675977U CN 215675977 U CN215675977 U CN 215675977U CN 202120369391 U CN202120369391 U CN 202120369391U CN 215675977 U CN215675977 U CN 215675977U
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Abstract
The utility model relates to the technical field of deep cooling, and discloses a deep cooling medicine cabinet based on a gas expansion technology, which comprises a box body, two gas expansion refrigerators and a heat exchange type heat regenerator shared by the two refrigerators, wherein the two refrigerators are connected with the box body through a heat exchange type heat regenerator; every refrigerator includes compression space, and the compression space outer wall is the hot junction, and compression space links to each other with regenerator one end, and the regenerator other end links to each other with expansion space, and expansion space outer wall is the cold junction, and the cold junction outer wall is connected with the cold junction heat exchange tube, and the air-cooler is installed to the cold junction heat exchange tube. The utility model adopts the two-gas countercurrent heat exchange type heat regenerator, solves the problem of insufficient heat exchange strength of the heat regenerator in the prior art, reduces the requirement of the heat storage capacity of the heat regenerator, and is suitable for the application fields of low-temperature medicine cabinets and the like which need deep cooling and large cooling capacity.
Description
Technical Field
The utility model relates to the technical field of cryogenic refrigeration, in particular to a low-temperature refrigerating system based on a gas expansion technology, and particularly relates to a gas expansion refrigeration cryogenic medicine cabinet which is mainly applied to the freezing and refrigerating of various bioactive substances in the fields of biology, medical research, medical beds and the like so as to enable the bioactive substances to be stored for a long time.
Background
The cryogenic medicine cabinet is an important basic device in modern life science research and engineering, and along with the increasing rise of life science and biological genetic engineering in recent years, the demand of the cryogenic medicine cabinet product tends to rise year by year, and the market potential is huge. At present, cryogenic medicine cabinets usually adopt a refrigeration technology of vapor compression cascade circulation or non-azeotropic mixed working medium self-cascade circulation to obtain low temperature. Because of adopting the traditional vapor compression refrigeration method, the system is complex, the volume is large, and the problems of ozone layer depletion environment and the like exist; in addition, the temperature regulating range is narrow and the low temperature below 90 ℃ is not easy to obtain due to the restriction of the thermophysical properties of the refrigerating working medium.
The gas expansion refrigerator adopts air, nitrogen or helium as a refrigerating working medium, and the whole refrigerating cycle has no phase change. Because the gas expansion refrigerator has characteristics such as small, light in weight, efficient high, no refrigerant pollution, refrigeration warm area are wide, starting current is low, the refrigerating output is easily adjusted, has obvious advantage in the aspect of environmental protection and energy saving, therefore has fairly big superiority as the cold source of cryrogenic medical cabinet.
The heat regenerator is a conventional heat exchange device of a gas expansion refrigerator, and the heat exchange performance of the heat regenerator directly influences the preparation temperature and the refrigeration efficiency of the refrigerator. The traditional heat regenerator mainly adopts a wire mesh heat accumulating type, and has the problems of complex structure, difficult manufacture, insufficient heat exchange strength and heat exchange time and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a refrigerating system based on a gas expansion technology and applicable to a cryogenic medicine cabinet below 90 ℃, provides a cryogenic medicine cabinet with simple system and high reliability, and solves the problems that the ozone layer is consumed by Freon when the medicine cabinet is refrigerated and the heat exchange strength and the heat exchange time of a heat regenerator are insufficient when a gas expansion refrigerator is adopted in the prior art.
The technical scheme of the utility model is realized as follows:
the cryogenic medicine cabinet comprises a box body, two gas expansion refrigerators and a heat exchange type heat regenerator shared by the two gas expansion refrigerators.
Each gas expansion refrigerator comprises a hot end used for radiating heat to the environment, a compression piston used for compressing gas in a compression space, a heat regenerator used for exchanging heat with another gas expansion refrigerator, a cold end used for providing cold quantity to a cold space of the medicine cabinet, an ejector used for gas expansion, an expansion space, a cold end heat exchange tube used for strengthening heat exchange and a fan used for airflow organization of the cold space of the medicine cabinet.
The gas expansion refrigerator is characterized in that a heat exchange type heat regenerator shared by the two refrigerators is arranged between the compression space and the expansion space of the gas expansion refrigerator, the compression space is connected with the heat regenerator through a gas pipeline, and the heat regenerator is connected with the expansion space through a gas pipeline.
The outer wall surface of the cold end of the gas expansion refrigerator is connected with a cold end heat exchange tube, and the cold end heat exchange tube is further provided with a fan.
The cold end of the gas expansion refrigerator, the cold end heat exchange tube and the fan are positioned in the cold space of the medicine cabinet.
The cryogenic medicine cabinet based on the gas expansion technology provided by the utility model has the following advantages:
(1) gas (such as air, nitrogen or helium) is used as a refrigerating medium, evaporation, condensation and other phase-change changes are avoided in the refrigerating cycle, the structure is simple, the performance is reliable, and no pollution is caused to the environment.
(2) The gas in the compression space (hot end) and the expansion space (cold end) of the two gas expansion refrigerators reversely flows in the two flow channels of the heat regenerator, and is countercurrent heat exchange, so that the heat exchange effect is good, and the requirement of the heat storage capacity of the heat regenerator is reduced.
(3) The heat exchange type heat regenerators of the two refrigerators are suitable for cryogenic and large-cold-quantity gas expansion refrigerators.
Drawings
Fig. 1 is a schematic overall structure diagram of an embodiment of the present application.
In the figure, 1: a gas expansion refrigerator 1; 2: a gas expansion refrigerator 2; 3: a medicine cabinet cold space; 4: a regenerator (shared by the gas expansion refrigerator 1 and the gas expansion refrigerator 2);
101 to 108 are members of the gas expansion refrigerator 1, and respectively include:
101: a hot end; 102: a compression piston; 103: compressing the space; 104: an ejector; 105: a cold end; 106: an expansion space; 107: a cold end heat exchange tube; 108: a fan;
201 to 208 are members of the gas expansion refrigerator 1, and respectively:
201: a hot end; 202: a compression piston; 203: compressing the space; 204: an ejector; 205: a cold end; 206: an expansion space; 207: a cold end heat exchange tube; 208: a fan.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
as shown in figure 1, the cryogenic medicine cabinet of the utility model comprises a box body 3, a gas expansion refrigerator 1, a gas expansion refrigerator 2 and a heat exchanger 4 shared by the refrigerator 1 and the refrigerator 2.
In the embodiment of the present application, the gas expansion refrigerator 1 includes a hot end 101 for dissipating heat to the environment, a compression piston 102 for compressing gas in the compression space, a compression space 103, a heat regenerator 4 for exchanging heat with the gas expansion refrigerator 2, a cold end 105 for providing cold to the cold space of the medical cabinet, an ejector 104 for expanding gas, an expansion space 106, a cold end heat exchange tube 107 for enhancing heat exchange, and a fan 108 for airflow organization of the cold space of the medical cabinet.
The cold end heat exchange tube 107 is of a coil structure, and a plurality of groups of fins for enhancing heat exchange are arranged on the coil. The coil pipe type structure and the arrangement of the fins on the coil pipe are conventional technologies, and detailed description is omitted.
The gas outlet end of the compression space 103 is connected with the heat regenerator 4 through a gas pipeline, and in the process of carrying out isochoric (or isentropic, variable) heat release on the gas in the compression space 103, the gas flows from the compression space 103 to the heat regenerator 4, and meanwhile, the gas in the heat regenerator 4 flows to the expansion space 106.
The gas outlet end of the expansion space 106 is connected to the heat regenerator 4 through a gas pipeline, and in the process of carrying out isometric (or isentropic, variable) heat absorption on the gas in the expansion space 106, the gas flows from the expansion space 106 to the heat regenerator 4, and meanwhile, the gas in the heat regenerator 4 flows to the compression space 103.
The outer wall surface of the cold end 105 is connected with a cold end heat exchange tube 107, and a fan 108 is arranged at the position of the cold end heat exchange tube 107 and used for enabling the circulating gas in the cold space of the medicine cabinet to pass through the cold end heat exchange tube 107 and providing cold energy to the cold space of the medicine cabinet.
The gas expansion refrigerator 1 comprises a hot end 201 used for radiating heat to the environment, a compression piston 202 used for compressing gas in a compression space, a compression space 203, a heat regenerator 4 used for exchanging heat with the gas expansion refrigerator 1, a cold end 205 used for providing cold to a cold space of a medicine cabinet, an ejector 204 used for gas expansion, an expansion space 206, a cold end heat exchange tube 207 used for strengthening heat exchange, and a fan 208 used for airflow organization of the cold space of the medicine cabinet.
The cold end heat exchange tube 207 is a coil structure, and a plurality of groups of fins for enhancing heat exchange are arranged on the coil. The coil pipe type structure and the arrangement of the fins on the coil pipe are conventional technologies, and detailed description is omitted.
The gas outlet end of the compression space 203 is connected with the heat regenerator 4 through a gas pipeline, and in the process of carrying out isochoric (or isentropic, variable) heat release on the gas in the compression space 203, the gas flows from the compression space 203 to the heat regenerator 4, and meanwhile, the gas in the heat regenerator 4 flows to the expansion space 206.
The gas outlet end of the expansion space 206 is connected to the heat regenerator 4 through a gas pipeline, and during the isochoric (or isentropic, variable) heat absorption process of the gas in the expansion space 206, the gas flows from the expansion space 206 to the heat regenerator 4, and meanwhile, the gas in the heat regenerator 4 flows to the compression space 203.
The outer wall surface of the cold end 205 is connected with a cold end heat exchange tube 207, and a fan 208 is installed at the cold end heat exchange tube 207 and used for enabling the circulating gas in the cold space of the medicine cabinet to pass through the cold end heat exchange tube 207 and providing cold energy to the cold space of the medicine cabinet.
The heat regenerator 4 is a plate-fin heat exchanger, and a grid heat exchanger or other compact heat exchangers with similar structures can also be adopted.
The gas expansion can adopt an isovolumetric expansion mode, an isentropic expansion mode or a polytropic expansion mode.
The working principle of the heat regenerator 4 in the gas expansion refrigerator 1 is as follows: when the compression piston 102 moves leftwards, the gas is compressed in the compression space 103, the heat generated in the compression process is taken away by the hot end 101, the isothermal compression process is performed, after the isothermal compression, the gas reaches the expansion space 106 through the heat regenerator 4, the gas releases heat in the heat regenerator 4, the temperature of the gas is reduced to the refrigeration target temperature, the gas expands isothermally in the expansion space 106, after the heat in the cold space of the medicine cabinet is absorbed through the cold end 105 and the cold end heat exchange tube 107 in the isothermal expansion process (the cooling purpose of the cold space of the medicine cabinet is achieved), the ejector 104 starts moving rightwards, so that the gas returns to the compression space 103 through the heat regenerator 4, the gas absorbs heat in the heat regenerator 4, after the temperature of the gas is increased to the initial temperature before the compression, the compression piston 102 of the compression space 103 starts moving leftwards, and a complete cycle is completed.
The operating principle of the gas expansion refrigerator 2 is the same as that of the refrigerator 1: when the compression piston 202 moves leftwards, the gas is compressed in the compression space 203, the heat generated in the compression process is taken away by the hot end 201, the isothermal compression process is performed, after the isothermal compression, the gas reaches the expansion space 206 through the heat regenerator 4, the gas releases heat in the heat regenerator 4, the temperature of the gas is reduced to the refrigeration target temperature, the gas is expanded isothermally in the expansion space 206, after the heat in the cold space of the medical cabinet is absorbed through the cold end 205 and the cold end heat exchange tube 207 in the isothermal expansion process (the cooling purpose of the cold space of the medical cabinet is achieved), the ejector 204 starts moving rightwards, so that the gas returns to the compression space 203 through the heat regenerator 4, the gas absorbs heat in the heat regenerator 4, after the temperature of the gas is increased to the initial temperature before the compression, the compression piston 202 of the compression space 203 starts moving leftwards, and a complete cycle is completed.
The working principle of the two heat regenerators of the parallel gas expansion refrigerator is as follows: two gas expansion refrigerators share one regenerator 4, and the two refrigerators are in opposite states:
(1) when the gas expansion refrigerator 1 operates, the gas releases heat through the hot end 101 in the compression space 103, and the gas is isothermally compressed; meanwhile, the gas in the gas expansion refrigerator 2 is expanded isothermally in the expansion space 106 to absorb the heat of the cold room of the medical cabinet;
(2) the gas of the gas expansion refrigerator 1 reaches the expansion space 106 through the heat regenerator 4, the gas releases heat in the heat regenerator 4, and simultaneously the gas of the refrigeration system 2 reaches the compression space 203 through the heat regenerator 4 and absorbs heat in the heat regenerator 4;
(3) after the gas of the gas expansion refrigerator 1 reaches the expansion space 106, the gas is subjected to isothermal expansion in the expansion space 106, the heat of a cold room of the medical cabinet is absorbed through the cold end 105 and the cold end heat exchange tube 107 in the isothermal expansion process, meanwhile, the gas of the refrigerating system 2 releases heat through the hot end 201 in the compression space 203, and the gas is subjected to isothermal compression;
(4) the gas of the gas expansion refrigerator 1 returns to the compression space 103 through the heat regenerator 4 under the action of the ejector 104, the gas absorbs heat in the heat regenerator 4, the temperature of the gas rises to the initial temperature before compression, meanwhile, the gas of the refrigeration system 2 reaches the expansion space 206 through the heat regenerator 4, and the gas releases heat in the heat regenerator 4;
(5) the above process is completed by a complete cycle.
Through the mode, the heat exchange type heat regenerator of the two parallel gas expansion refrigerators solves the problem of insufficient heat exchange strength in the prior art, and the gas in the expansion space and the gas in the compression space of the two gas expansion refrigerators flow oppositely at the two sides of the heat exchange channel of the heat regenerator to realize countercurrent heat exchange: one of them is in the process of isothermal compression, and the other is in the process of isothermal expansion; one of the heat-absorbing materials is in an isochoric (or isentropic and variable) heat-releasing process, and the other one is in an isochoric (or isentropic and variable) heat-absorbing process; one of them is in the process of isothermal expansion, and the other is in the process of isothermal compression; one of the heat-absorbing materials is in an isochoric (or isentropic and variable) heat-absorbing process, and the other one is in an isochoric (or isentropic and variable) heat-releasing process; thus forming a cycle.
The gas in the two working cavities in the isochoric (or isentropic, variable) heat release process and the isochoric (or isentropic, variable) heat absorption process flows in opposite directions in the heat regenerator, wherein the heat release is performed in the former and the heat absorption is performed in the latter.
The working media in the two working cavities in the isothermal expansion process and the isothermal compression process basically do not flow in the heat regenerator, the heat regenerator absorbs heat, and the heat regenerator releases heat.
The heat transfer directions in the two gas expansion refrigerators at any time are opposite, and the countercurrent heat exchange can be continuously realized; the heat regenerator does not need large heat storage capacity and has good heat exchange effect; the heat regenerator replaces the existing wire mesh, has simple manufacturing process, reduces the cost, has higher reliability, is easier to maintain the temperature difference between the high-position side and the low-temperature side, improves the refrigeration efficiency, and is suitable for application occasions for preparing lower temperature and larger refrigeration capacity.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. The utility model provides a cryrogenic medicine cabinet based on gas expansion technique, includes the box, two gas expansion refrigerators, heat transfer formula regenerator, its characterized in that: the two gas expansion refrigerators share one heat exchange type heat regenerator, and the two refrigerators are connected through the heat exchange type heat regenerator.
2. The cryogenic medicine cabinet based on gas expansion technology according to claim 1, characterized in that: each gas expansion refrigerator comprises a compression space, the outer wall of the compression space is a hot end, the compression space is connected with one end of a heat regenerator, the other end of the heat regenerator is connected with an expansion space, and the outer wall of the expansion space is a cold end.
3. The cryogenic medicine cabinet based on gas expansion technology according to claim 1, characterized in that: the outer wall surface of the cold end of each gas expansion refrigerator is connected with a cold end heat exchange tube, the cold end heat exchange tube is of a coil structure, and a plurality of groups of fins for enhancing heat exchange are arranged on the coil.
4. The cryogenic medicine cabinet based on gas expansion technology according to claim 3, characterized in that: and a circulating fan is arranged at the cold end heat exchange tube of each gas expansion refrigerator.
5. The cryogenic medicine cabinet based on gas expansion technology according to claim 1, characterized in that: the heat exchange type heat regenerator shared by the two gas expansion refrigerators is a plate-fin heat exchanger, a grid heat exchanger or a compact heat exchanger; the gas expansion adopts a constant volume expansion mode, an isentropic expansion mode or a variable expansion mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120369391.XU CN215675977U (en) | 2021-02-10 | 2021-02-10 | Cryogenic medicine cabinet based on gas expansion technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120369391.XU CN215675977U (en) | 2021-02-10 | 2021-02-10 | Cryogenic medicine cabinet based on gas expansion technology |
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| Publication Number | Publication Date |
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| CN215675977U true CN215675977U (en) | 2022-01-28 |
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| CN202120369391.XU Active CN215675977U (en) | 2021-02-10 | 2021-02-10 | Cryogenic medicine cabinet based on gas expansion technology |
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- 2021-02-10 CN CN202120369391.XU patent/CN215675977U/en active Active
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