CN215571493U - Centralized refrigeration type low-temperature storage system - Google Patents
Centralized refrigeration type low-temperature storage system Download PDFInfo
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- CN215571493U CN215571493U CN202121780540.8U CN202121780540U CN215571493U CN 215571493 U CN215571493 U CN 215571493U CN 202121780540 U CN202121780540 U CN 202121780540U CN 215571493 U CN215571493 U CN 215571493U
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Abstract
A centralized refrigeration type low-temperature storage system is characterized by comprising a plurality of heat preservation boxes; the heat exchangers are at least partially arranged in the heat preservation box body; the refrigeration unit is positioned outside the heat preservation box body; the cold guide elements are two-phase fluid loops with variable heat conduction, are thermally connected with the cold output end of the refrigeration unit, and are thermally connected with the heat exchanger and used for transmitting the cold generated by the refrigeration unit to the heat exchanger. The utility model adopts a centralized refrigeration mode, has high refrigeration efficiency compared with a mode of adopting a plurality of single ultra-low temperature refrigerators, can obviously reduce the operation cost, has small initial investment and low failure rate, and can be arranged outdoors to isolate the heat and the noise emitted by the refrigeration unit outdoors.
Description
Technical Field
The utility model relates to the field of refrigeration, in particular to a centralized refrigeration type low-temperature storage system.
Background
The activity of a biological sample is often important in relation to its storage temperature. For example, some vaccines have a longer shelf life in low temperature environments. Biological sample libraries also use ultra-low temperature refrigerators to store samples. Large hospitals need to store a large amount of vaccines or biological samples for a long time, and have strong requirements on the purchase cost, reliability and operation cost of the low-temperature storage device. The existing ultra-low temperature refrigerator adopts a mode of integrating a refrigerating system and a box body into a whole, the storage space of the single ultra-low temperature refrigerator is very limited, and the requirement can be met only by equipping a large number of single ultra-low temperature refrigerators, so that the purchase cost is very high. And the smaller the scale of the refrigerating system is, the lower the efficiency is, the lower the independent operation efficiency of a large number of monomer ultra-low temperature refrigerators is, the electric energy is wasted, the operation cost is higher, the integral failure-free rate is greatly reduced, and the maintenance cost is also higher. In addition, a large number of single ultra-low temperature refrigerators run together with large noise, and discharge a large amount of heat indoors, which causes burden on air conditioners in machine rooms.
Disclosure of Invention
In view of the above, the present invention provides a centralized refrigeration type cryogenic storage system.
The utility model adopts the following technical scheme:
the temperature sensors are arranged in the heat preservation boxes;
the heat exchangers are at least partially arranged in the heat preservation box body;
the refrigeration unit is positioned outside the heat preservation box body and is configured to provide refrigeration capacity for the heat preservation box body;
the cold guide elements are two-phase fluid loops with variable heat conduction, are thermally connected with the cold output end of the refrigeration unit, and are thermally connected with the heat exchanger and used for transmitting the cold generated by the refrigeration unit to the heat exchanger;
a plurality of electric heaters configured to heat the cold-conducting elements to adjust the operating temperature thereof; and
a controller configured to adjust an input power of the electric heater.
Optionally, the heat exchanger is any one of a heat pipe, a pulsating heat pipe or a gravity siphon pipe.
Optionally, the cold-guiding element is a Loop Heat Pipe (LHP) which includes an evaporator, a compensator, a condenser, a vapor line and a liquid line.
Optionally, the electric heater is arranged at the compensator for heating the compensator.
Optionally, the cold-conducting element is a Capillary Pump Loop (CPL) including an evaporator, a reservoir, a condenser, a vapor line, and a liquid line.
Optionally, the electric heater is arranged at the reservoir for heating the reservoir.
Optionally, the refrigeration unit includes a refrigerator, and the refrigerator is any one of a GM refrigerator, a pulse tube refrigerator, a stirling refrigerator, or a vapor compression refrigerator.
Optionally, a part of the cold guide element is of a flexible structure and can be bent for multiple times.
Optionally, the cold conducting element is thermally connected to the cold output end of the refrigeration unit, and/or the cold conducting element is thermally connected to the heat exchanger in a structure capable of being repeatedly disassembled and assembled.
Optionally, the heat-insulating box body is configured with a small-sized cryogenic refrigerator, and a cold head of the small-sized cryogenic refrigerator is thermally connected with the heat exchanger arranged in the heat-insulating box body.
Compared with the prior art, the utility model is provided with the refrigeration unit to intensively produce the refrigeration capacity, the refrigeration unit can use a large-scale refrigeration system, and compared with the mode of arranging a plurality of single ultra-low temperature refrigerators, the refrigeration efficiency is improved, the initial investment and the operation cost are reduced, and the reliability is also improved. In addition, the refrigerating unit can be arranged outdoors, the heat and the noise emitted by the refrigerating unit are isolated from the outdoors, the indoor air conditioning load is not influenced, and the indoor environment is quiet. The heat preservation box body can be additionally provided with a refrigerating system, and cold energy is temporarily provided after the heat preservation box body is separated from the centralized refrigerating unit, so that the heat preservation box body is convenient to transport.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a centralized refrigeration cryogenic storage system of the present invention;
FIG. 2 is a schematic view of a first embodiment of a refrigeration unit of the present invention;
FIG. 3 is a schematic view of a second embodiment of a refrigeration unit of the present invention;
FIG. 4 is a schematic view of a first embodiment of a cold-conducting element of the present invention;
FIG. 5 is a schematic view of a second embodiment of a cold-conducting element of the present invention;
FIG. 6 is a schematic view of an embodiment of the utility model in which a small-sized cryocooler is disposed in the thermal insulation case.
In the above figures: 1-refrigeration unit, 11-refrigerator, 12-refrigeration unit cold output end, 2-insulation box, 3-cold conducting element, 4-heat exchanger, 5-temperature sensor, 6-electric heater, 7-controller, 8-small low temperature refrigerator, 81-small low temperature refrigerator 8 cold head, 31-loop heat pipe, 32-capillary pump loop, 311-loop heat pipe evaporator, 312-loop heat pipe vapor pipeline, 313-loop heat pipe condenser, 314-loop heat pipe liquid pipeline, 315-loop heat pipe compensator, 321-capillary pump loop evaporator, 322-capillary pump loop vapor pipeline, 323-capillary pump loop condenser, 324-capillary pump loop liquid pipeline, 325 — reservoir of capillary pump loop.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Referring to fig. 1, a schematic diagram of an embodiment of a centralized refrigeration cryogenic storage system according to the present invention is shown. The refrigeration system comprises a refrigeration unit 1, a heat preservation box body 2, a cold conducting element 3, a heat exchanger 4, a temperature sensor 5, an electric heater 6 and a controller 7. The refrigerating unit 1 comprises a refrigerator 11 and a refrigerating output end 12 of the refrigerating unit 1. The cold conduction element 3 is a variable heat conduction two-phase fluid loop and is provided with an evaporation end and a condensation end. The condensation end of the cold conducting element 3 is thermally connected with the cold output end 12 of the refrigeration unit, and the evaporation end of the cold conducting element 3 is thermally connected with the heat exchanger 4.
The number and volume of the heat-insulating boxes 2 and the set temperature of each heat-insulating box are designed according to specific use conditions.
The number of the refrigerating machines 11 is single or multiple, and the specific configuration of the refrigerating machines needs to ensure that the total refrigerating capacity of the refrigerating unit 1 meets the heat load of all the heat preservation boxes 2.
In this embodiment, the heat preservation box 2, the cold conduction element 3 and the heat exchanger 4 correspond to each other one by one, but not limited thereto. There is no definite correspondence between the number of the thermal insulation boxes 2, the cold conduction elements 3 and the heat exchangers 4. Particularly, when the volume of the heat preservation box body 2 is large, the required cold quantity is large, and a plurality of cold guide elements 3 are required to transmit the cold quantity. The more the number of the heat exchangers 4 is, the more uniform the distribution in the heat-insulating box body 2 is, and the more uniform the temperature at each position in the heat-insulating box body 2 is.
The heat exchanger 4 is any one of a heat pipe, a pulsating heat pipe or a gravity siphon pipe.
In some embodiments, the cold conducting element 3 has a flexible, multi-bendable structure, such as a bellows for a portion of the pipeline.
At least one of the thermal connection between the cold guide element 3 and the heat exchanger 4 and the thermal connection between the cold guide element 3 and the cold output end 12 is a structure capable of being repeatedly disassembled and assembled, such as bolt connection, buckle connection and the like. The flexible structure on the cold component 3 is led in the cooperation for insulation box 2 is easy to assemble and dismantles, in order to be connected to or break away from refrigeration unit 1, makes things convenient for it to transport other places and uses.
The basic working principle is as follows: the refrigerating machine 11 in the refrigerating unit 1 generates cold quantity and transmits the cold quantity to the condensation end of the cold guide element 3 through the cold quantity output end 12, the working medium in the cold guide element 3 is cooled, condensed and flows back to the evaporation end of the cold guide element, the working medium absorbs heat at the heat exchanger 4 to be vaporized and returns to the condensation end of the cold guide element along a pipeline to be condensed again, and therefore the cold quantity generated by the refrigerating unit 1 is transmitted to the heat exchangers 4 and then is transmitted into the heat preservation box body 2 through the heat exchangers 4.
The temperature control principle is as follows: according to the principle of heat balance
Q＝KL·(Tb-Tc)
Q＝(Ta-Tb)/R
Q＝Hf·(To-Ta)+q
Q, transmitted cold quantity;
ta, Tb, Tc and To are respectively the temperature in the heat preservation box body 2, the temperature at the evaporation end of the cold conducting element 3, the temperature at the cold output end 12 of the refrigeration unit and the ambient temperature;
KLthe efficiency of the cold quantity equivalent transmission of the cold conduction element 3, i.e. the cold conduction coefficient;
r, thermal resistance for transmitting cold energy between the evaporation end of the cold conducting element 3 and the heat preservation box body 2;
Hfthe efficiency of heat leakage from the environment into the heat preservation box body 2;
q, a heat source in the heat preservation box body 2;
because, the structures of the heat preservation box body 2, the heat exchanger 4 and the cold guide element 3 are determined, R, HfIs a fixed value, Tc, Tb, To, q are all definite values, when K is shownLWhen determined, the values of Q, Ta and Tb have unique determined values. When K is changedLThe values of Q, Ta and Tb are changed accordingly. I.e. by changing KLThe value of Ta may be made constant To a certain value in the range of (Tb, To). Ta is the temperature in the heat preservation box body 2, and the temperature control function of the heat preservation box body 2 is realized. When K isLThe temperature Tb is close to the temperature Tc, namely the temperature Ta in the heat preservation box body 2 is close to the temperature Tc of the cold output end 12 of the refrigeration unit; on the contrary, when KLWhen the temperature is sufficiently small, the temperature Ta in the heat preservation box body 2 approaches the ambient temperature To.
The temperature sensor 5 transmits the temperature in the heat preservation box body 2 to the controller 7 in real time, and the controller 7 automatically adjusts the input power of the electric heater 6. When the cold conducting element 3 works, the working medium in the cold conducting element is in a vapor-liquid two-phase saturated state, and the temperature and the pressure of the working medium correspond to each other. By adjusting the heating work of the electric heater 6 on the cold-conducting element 3The working temperature can be adjusted, and the variable heat conduction function, namely the K is adjustedLThe value is obtained.
Referring to fig. 2, a schematic diagram of a refrigeration unit according to a first embodiment of the utility model is shown. In the present embodiment, the refrigeration unit 1 includes two refrigerators 11. The cold heads 111 of the two refrigerators are connected together by a cold conducting plate 13. The cold conducting plate 13 is the cold output end 12 of the refrigeration unit 1. In the present embodiment, the refrigerator 11 is a stirling refrigerator, but the refrigerator 11 is not limited to this, and may be a cryocooler such as a pulse tube refrigerator or a GM refrigerator. The number of the refrigerators 11 is not limited to two, and is determined according to the thermal load of the system.
In this embodiment, the refrigerator 11 is thermally connected to the cold guiding element 3 through the cold guiding plate 13, but not limited to this, the cold head 111 of the refrigerator 11 may also be directly thermally connected to the cold guiding element 3. In this case, the cold head 111 of the refrigerator 11 is the cold output end 12 of the refrigeration unit 1.
Referring to fig. 3, a schematic diagram of a refrigeration unit according to a second embodiment of the utility model is shown. In this embodiment, the refrigerating machine 11 in the refrigerating unit 1 adopts a cascade vapor compression refrigerating system, and a part of the pipe section of the refrigerant pipeline 112 is arranged at the cold guide plate 13, exchanges heat with the cold guide plate 13, and outputs cold energy to the outside through the cold guide plate 13. In this case, the cold conducting plate 13 is the cold output end 12 of the refrigeration unit 1. In addition, the cold guiding element 3 can also be directly connected with the outer wall of the cooling medium pipeline 112 to obtain the cooling capacity, in this case, the cooling medium pipeline 112 is the cooling capacity output end 12 of the refrigeration unit 1.
Referring to fig. 4, a schematic diagram of a cold-conducting element according to a first embodiment of the utility model is shown. In this embodiment, the cold-guiding element is a Loop Heat Pipe (LHP). The loop heat pipe 31 includes an evaporator 311 of the loop heat pipe, a vapor line 312 of the loop heat pipe, a condenser 313 of the loop heat pipe, a liquid line 314 of the loop heat pipe, and a compensator 315. Wherein, at least part of the pipe sections of the liquid pipeline 314 and the vapor pipeline 312 of the loop heat pipe are corrugated pipes. The evaporator 311 of the loop heat pipe is thermally connected to the heat exchanger 14, and the liquid working medium therein absorbs the heat of the heat exchanger 14 to be vaporized. The vapor working medium reaches the condenser 313 along the pipeline, releases heat and condenses, transmits the heat to the cold output end 12 of the refrigeration unit 1 and condenses into liquid working medium, and the liquid working medium flows back to the evaporator 311 of the loop heat pipe. Circulating in this way, the cold energy generated by the refrigerating unit 1 is transmitted to the heat preservation box body 2.
The electric heater 6 is disposed on an outer wall of the compensator 315 of the loop heat pipe. By adjusting the heating power of the compensator 315 for the loop heat pipe, the cooling capacity transmission efficiency of the loop heat pipe 31 can be adjusted greatly, i.e. its K is changedLAnd the function of variable heat conduction is realized. This function is a characteristic of the loop heat pipe itself. The temperature sensor 5 transmits the temperature in the heat preservation box body 2 to the controller 7 in real time, and the controller 7 automatically adjusts the input power of the electric heater 6. The temperature in the heat preservation box body 2 can be raised by increasing the power of the electric heater 6; on the contrary, when the heating power is 0, the temperature of the thermal insulation box 2 approaches to the temperature of the cold output end 12 of the refrigeration unit.
Referring to fig. 5, a diagram of a cold-conducting element according to a second embodiment of the present invention is shown. In this embodiment, the cold conducting element is a Capillary Pumped Loop (CPL). The capillary-pump circuit 32 comprises an evaporator 321 of the capillary-pump circuit, a vapor line 322 of the capillary-pump circuit, a condenser 323 of the capillary-pump circuit, a liquid line 324 of the capillary-pump circuit and a reservoir 325. Wherein at least a part of the tube sections of the liquid line 324 and the vapor line 322 of the capillary pump circuit are bellows. The evaporator 321 of the capillary pump loop is thermally connected to the heat exchanger 14, and the liquid working medium therein absorbs the heat of the heat exchanger 14 to be vaporized. The vaporous working medium reaches the condenser 323 of the capillary pump loop along the pipeline, releases heat and condenses, transmits heat to the cold output end 12 of the refrigeration unit 1 and condenses into a liquid working medium, and the liquid working medium flows back to the evaporator 321 of the capillary pump loop. Circulating in this way, the cold energy generated by the refrigerating unit 1 is transmitted to the heat preservation box body 2.
An electric heater 6 is provided on the outer wall of the reservoir 325 of the capillary pump circuit. By adjusting the heating power to the reservoir 325 of the capillary pump circuit, the cold transmission efficiency of the capillary pump circuit 32 can be adjusted substantially, i.e. K is changedLAnd the function of variable heat conduction is realized. The function being a capillary pump circuitThe characteristics of the material itself. The temperature sensor 5 transmits the temperature in the heat preservation box body 2 to the controller 7 in real time, and the controller 7 automatically adjusts the input power of the electric heater 6. The temperature in the heat preservation box body 2 can be raised by increasing the power of the electric heater 6; on the contrary, when the heating power is 0, the temperature of the thermal insulation box 2 approaches to the temperature of the cold output end 12 of the refrigeration unit.
Referring to fig. 6, a schematic diagram of an embodiment of a small-sized cryogenic refrigerator configured in a thermal insulation box according to the present invention is shown. The heat preservation box body 2 is additionally provided with a small-sized low-temperature refrigerator 8, and a cold head 81 of the small-sized low-temperature refrigerator 8 is thermally connected with the heat exchanger 4, so that the heat preservation box body 2 provides a refrigeration function when being separated from the refrigeration unit 1. The small cryogenic refrigerator 8 may be any one of a stirling refrigerator, a pulse tube refrigerator, and a GM refrigerator.
Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, rather than limitations, and that many variations and modifications of the utility model are possible to those skilled in the art, without departing from the spirit and scope of the utility model.
Claims (10)
1. A centralized refrigeration cryogenic storage system, comprising:
the temperature sensors are arranged in the heat preservation boxes;
the heat exchangers are at least partially arranged in the heat preservation box body;
the refrigeration unit is positioned outside the heat preservation box body and is configured to provide refrigeration capacity for the heat preservation box body;
the cold guide elements are two-phase fluid loops with variable heat conduction, are thermally connected with the cold output end of the refrigeration unit, and are thermally connected with the heat exchanger and used for transmitting the cold generated by the refrigeration unit to the heat exchanger;
a plurality of electric heaters configured to heat the cold-conducting elements to adjust the operating temperature thereof; and
a controller configured to adjust an input power of the electric heater.
2. A centralized refrigeration cryogenic storage system according to claim 1, wherein:
the heat exchanger is any one of a heat pipe, a pulsating heat pipe or a gravity siphon.
3. A centralized refrigeration cryogenic storage system according to claim 1, wherein:
the cold-guiding element is a Loop Heat Pipe (LHP) which comprises an evaporator, a compensator, a condenser, a vapor line and a liquid line.
4. A centralized refrigeration cryogenic storage system according to claim 3, wherein:
the electric heater is arranged at the compensator for heating the compensator.
5. A centralized refrigeration cryogenic storage system according to claim 1, wherein:
the cold-conducting element is a Capillary Pumped Loop (CPL) comprising an evaporator, a reservoir, a condenser, a vapor line and a liquid line.
6. A centralized refrigeration cryogenic storage system according to claim 5, wherein:
the electric heater is arranged at the reservoir for heating the reservoir.
7. A centralized refrigeration cryogenic storage system according to claim 1, wherein:
the refrigerating unit comprises a refrigerator, and the refrigerator is any one of a GM refrigerator, a pulse tube refrigerator, a Stirling refrigerator or a vapor compression type refrigerator.
8. A centralized refrigeration cryogenic storage system according to claim 1, wherein:
the local part of the cold guide element is of a flexible structure and can be bent for many times.
9. A centralized refrigeration cryogenic storage system according to claim 1, wherein:
the cold guide element is thermally connected with the cold output end of the refrigeration unit, and/or the cold guide element is thermally connected with the heat exchanger to form a structure capable of being repeatedly disassembled and assembled.
10. A centralized refrigeration cryogenic storage system according to claim 1, wherein:
the heat preservation box body is provided with a small-sized low-temperature refrigerator, and a cold head of the small-sized low-temperature refrigerator is thermally connected with the heat exchanger arranged on the heat preservation box body.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121780540.8U CN215571493U (en) | 2021-08-03 | 2021-08-03 | Centralized refrigeration type low-temperature storage system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121780540.8U CN215571493U (en) | 2021-08-03 | 2021-08-03 | Centralized refrigeration type low-temperature storage system |
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| CN215571493U true CN215571493U (en) | 2022-01-18 |
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| CN202121780540.8U Active CN215571493U (en) | 2021-08-03 | 2021-08-03 | Centralized refrigeration type low-temperature storage system |
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- 2021-08-03 CN CN202121780540.8U patent/CN215571493U/en active Active
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