CN112892892A - Refrigeration system of hypergravity centrifuge - Google Patents
Refrigeration system of hypergravity centrifuge Download PDFInfo
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- CN112892892A CN112892892A CN201911224990.6A CN201911224990A CN112892892A CN 112892892 A CN112892892 A CN 112892892A CN 201911224990 A CN201911224990 A CN 201911224990A CN 112892892 A CN112892892 A CN 112892892A
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- heat exchange
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 38
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 239000000110 cooling liquid Substances 0.000 claims abstract description 17
- 238000005507 spraying Methods 0.000 claims abstract description 8
- 239000007921 spray Substances 0.000 claims description 21
- 230000005494 condensation Effects 0.000 claims description 7
- 238000009833 condensation Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 57
- 239000003570 air Substances 0.000 description 44
- 238000001704 evaporation Methods 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 8
- 239000012809 cooling fluid Substances 0.000 description 6
- 239000002826 coolant Substances 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B15/00—Other accessories for centrifuges
- B04B15/02—Other accessories for centrifuges for cooling, heating, or heat insulating
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- Centrifugal Separators (AREA)
Abstract
The application provides a refrigeration system of a hypergravity centrifugal machine, the hypergravity centrifugal machine comprises a rotor rotating around a vertical axis and a heat exchange chamber covering the rotor, and the refrigeration system comprises a liquid cooling device and an evaporative cooling device; the liquid cooling device comprises a refrigeration source and a corresponding cooling liquid circulating pipeline, and the cooling liquid circulating pipeline penetrates through the wall of the heat exchange chamber to perform heat exchange; the evaporative cooling device includes: the gas circulation pipeline is provided with a gas inlet and a gas outlet which are communicated with the inside of the heat exchange chamber, the cooling liquid circulation pipeline and the gas circulation pipeline are thermally coupled through a condensing device, and a liquid storage device and a spraying pipeline which are connected into the gas circulation pipeline and used for collecting condensate are connected into the gas circulation pipeline. The spraying pipeline comprises a liquid suction port connected into the liquid storage device and a spraying head which is arranged in the heat exchange chamber and communicated with the liquid suction port. The application provides a hypergravity centrifuge's refrigerating system can in time reduce hypergravity centrifuge's temperature, guarantees hypergravity centrifuge's steady operation.
Description
Technical Field
The application relates to the technical field of hypergravity, in particular to a refrigeration system of a hypergravity centrifugal machine.
Background
The supergravity centrifuge usually comprises a rotor and a heat exchange chamber, the rotor of the centrifuge is driven to rotate at a high speed by a driving motor, huge centrifugal force is generated, and the requirement of a supergravity experiment is met. In the process, the rotation of the rotor drives the air in the heat exchange chamber to flow, so that the friction between the rotor and the fixed support, between the rotor and the ambient air, and between the flowing air and the wall surface of the heat exchange chamber is caused to generate heat.
According to relevant experience, the heat generated by the high-speed centrifuge under the 1500g operating condition reaches more than 5 MW. If the part of heat is not dissipated in time, the temperature in the experiment chamber is rapidly increased, the safe operation of the whole experiment device is endangered, and the safety performance and the measurement precision of electronic elements such as a measurement sensor and the like are greatly influenced.
Therefore, there is a need for an efficient refrigeration system suitable for a hypergravity centrifuge.
Disclosure of Invention
The application provides hypergravity centrifuge's refrigerating system can in time reduce hypergravity centrifuge's temperature, guarantees hypergravity centrifuge's steady operation.
In the refrigeration system of the supergravity centrifuge, the supergravity centrifuge comprises a rotor rotating around a vertical axis and a heat exchange chamber covering the rotor, and the refrigeration system comprises a liquid cooling device and an evaporative cooling device; the liquid cooling device comprises a refrigeration source and a corresponding cooling liquid circulating pipeline, and the cooling liquid circulating pipeline penetrates through the wall of the heat exchange chamber to perform heat exchange;
the evaporative cooling apparatus includes:
the gas circulation pipeline is provided with a gas inlet and a gas outlet which are communicated with the heat exchange chamber;
the cooling liquid circulation pipeline and the gas circulation pipeline are thermally coupled through the condensing device;
the liquid storage device is connected to the gas circulation pipeline and is used for collecting condensate;
and the spraying pipeline comprises a liquid suction port connected to the liquid reservoir and a spraying head which is arranged in the heat exchange chamber and communicated with the liquid suction port.
Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.
Optionally, the air inlet is closer to the vertical axis than the air outlet.
Optionally, the refrigeration system of the supergravity centrifuge further includes a vacuum pump, and the vacuum pump is connected to the heat exchange chamber through a vacuum pipeline to adjust the vacuum degree in the heat exchange chamber.
Optionally, a section of the gas circulation pipeline between the gas outlet and the condensing device is a condensing front section; the vacuum pipeline is communicated with the condensation front section.
Optionally, a first air valve is arranged in the vacuum pipeline, and a second air valve is arranged in the condensation front section.
Optionally, the heat exchange chamber is cylindrical with two closed ends, and comprises an upper wall, a lower wall and a circumferential wall; the air inlet is arranged on the lower wall, and the air outlet is arranged on the upper wall.
Optionally, the spray head is adjacent to the outside of the rotor.
Optionally, the spray head is located below the rotor and sprays upwards.
Optionally, a plurality of sets of evaporative cooling devices are uniformly arranged along the circumferential direction of the heat exchange chamber, and the gas circulation pipelines of the evaporative cooling devices are communicated with the heat exchange chamber.
Optionally, the heat exchange chamber has a longitudinal section passing through the vertical axis, and in the same set of the evaporative cooling device, the air inlet and the air outlet are located on the same longitudinal section and on the same side of the vertical axis.
The application provides a hypergravity centrifuge's refrigerating system can in time reduce hypergravity centrifuge's temperature, guarantees hypergravity centrifuge's steady operation.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a refrigeration system of a supergravity centrifuge.
The reference numerals in the figures are illustrated as follows:
100. a rotor; 200. a heat exchange chamber; 210. an upper wall; 220. a lower wall; 230. a circumferential wall; 310. a refrigeration source; 320. a coolant circulation line; 410. a gas circulation line; 411. an air inlet; 412. an air outlet; 413. a condensation front section; 420. a condensing unit; 430. a reservoir; 440. a spray line; 441. a spray head; 510. a vacuum pump; 520. a vacuum line; 610. a first air valve; 620. a second air valve.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
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. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
In an embodiment of a refrigeration system of a hypergravity centrifuge, the hypergravity centrifuge comprises a rotor 100 rotating around a vertical axis and a heat exchange chamber covering the rotor, and the refrigeration system comprises a liquid cooling device and an evaporative cooling device. The liquid cooling means comprise a refrigeration source 310 and a corresponding cooling liquid circulation line 320, the cooling liquid circulation line 320 passing through the wall of the heat exchange chamber for heat exchange.
The evaporative cooling device includes a gas circulation line, a condensing device 420, a reservoir 430, and a spray line 440. The gas circulation line 410 has a gas inlet 411 and a gas outlet 412 communicating with the heat exchange chamber. The coolant circulation line 320 is thermally coupled to the gas circulation line via a condensing device 420. The reservoir 430 is connected to a gas circulation line for collecting the condensate. The spray line 440 includes a liquid suction port connected to the liquid reservoir, and a spray head 441 installed in the heat exchange chamber and communicating with the liquid suction port.
When the rotor of the hypergravity centrifugal machine rotates at a high speed, the indoor gas of the heat exchange chamber rotates along with the rotor. According to different application scenes of the hypergravity centrifugal machine, indoor gas of the heat exchange chamber can be air or atmosphere required by other experiments. The rotor agitates the chamber gases at high speed causing the temperature of the chamber gases in the heat exchange chamber to rise. When the indoor gas moves at a high speed, the indoor gas and the chamber wall of the heat exchange chamber rub with each other, so that the temperature of the chamber wall of the heat exchange chamber is increased. The temperature of the indoor gas needs to be reduced to control the temperature parameters of the supergravity simulation experiment within a proper range. It is also desirable to reduce the temperature of the chamber walls of the heat exchange chamber to ensure operation of the sensors mounted to the chamber walls.
The embodiment reduces the temperature of the chamber wall of the heat exchange chamber through the liquid cooling device. The cooling fluid circulates through the cooling fluid circulation line 320, the temperature of the cooling fluid decreases as the cooling fluid passes through the refrigeration source 310, and the temperature of the cooling fluid increases as the cooling fluid passes through the chamber wall of the heat exchange chamber and carries away heat from the chamber wall, so that the temperature of the chamber wall of the heat exchange chamber decreases. The coolant circulation pipeline 320 passes through the wall of the heat exchange chamber, which means that the coolant circulation pipeline is laid along the wall of the heat exchange chamber, and the extending direction of the coolant circulation pipeline is parallel to the plane of the wall of the heat exchange chamber without considering the thickness of the wall of the heat exchange chamber. The periphery of the cooling liquid circulation pipeline is wrapped in the chamber wall of the heat exchange chamber, so that the contact area between the cooling liquid circulation pipeline and the chamber wall is increased, the heat exchange efficiency is high, the cooling liquid circulation pipeline is protected by the chamber wall of the heat exchange chamber, the cooling liquid circulation pipeline is not easily corroded by indoor gas or outdoor gas of the heat exchange chamber, and the heat exchange chamber is safer and more reliable.
This embodiment also reduces the indoor gas temperature of the heat exchange chamber by means of an evaporative cooling device. The indoor gas of the heat exchange chamber circulates through a gas circulation pipeline. When the indoor gas of the heat exchange chamber flows through the condensing device, the indoor gas exchanges heat with the cooling liquid in the cooling liquid circulation pipeline, and flows back into the heat exchange chamber after the temperature is reduced. Thereby reducing the gas temperature in the heat exchange chamber by means of heat exchange.
The evaporative cooling device also directly reduces the indoor gas temperature of the heat exchange chamber in an evaporative heat absorption mode. The spray head 441 sprays droplets into the chamber of the heat exchange chamber, and the droplets directly absorb heat of the gas in the chamber of the heat exchange chamber through evaporation, thereby reducing the temperature of the gas in the heat exchange chamber.
The vapor generated by the evaporation of the fog drops can increase the vapor pressure in the heat exchange chamber, and the vapor pressure increase will affect the evaporation efficiency of the fog drops. The condensing unit reduces the temperature of the indoor gas, simultaneously reduces the partial pressure of the steam in the indoor gas, and ensures the evaporation efficiency of the fog drops. Condensate generated by the condensing device flows into the liquid storage device, the condensate stored in the liquid storage device enters the heat exchange chamber through the spray head 441 to be evaporated, a circulation loop of an evaporation working medium is formed, the automation degree and reliability of the refrigerating system are improved, and stable operation of the supergravity centrifugal machine is guaranteed.
To reduce the operating costs of the hypergravity centrifuge, in one embodiment the air inlet is closer to the vertical axis than the air outlet. When the hypergravity centrifuge operates, a centrifugal force field can be generated in the heat exchange chamber, the centrifugal force field causes that the air pressure at the air outlet 412 far away from the vertical axis is higher, the air pressure at the air inlet 411 close to the vertical axis is lower, the pressure difference in a certain range is maintained at the two ends of the air circulation pipeline, the air in the heat exchange chamber is driven by the pressure difference to flow along the air circulation pipeline, an air pump does not need to be additionally arranged, and the operation cost of the hypergravity centrifuge is saved.
In order to further improve the cooling efficiency and meet the cooling requirement when the hypergravity centrifuge operates at a high speed, in one embodiment, the refrigeration system of the hypergravity centrifuge further comprises a vacuum pump 510, and the vacuum pump is connected to the heat exchange chamber through a vacuum pipeline 520 to adjust the vacuum degree in the heat exchange chamber.
On the one hand, for the hypergravity centrifuge, reducing the gas density in the heat exchange chamber will effectively reduce the friction between the indoor gas and the chamber wall, and between the indoor gas and the rotor 100, thereby reducing the overall heat production rate of the hypergravity centrifuge. On the other hand, when the indoor vacuum degree is increased, the partial pressure of the indoor steam is reduced, so that the evaporation of the fog drops sprayed by the spray head 441 is accelerated, and the heat absorption rate of the refrigeration system is increased. The two aspects act together to improve the refrigerating capacity of the refrigerating system.
In the gas circulation pipeline, a section between the gas outlet and the condensing device is a condensing front section 413; the vacuum line 520 is connected to the condensing front section 413.
Through communicating vacuum pipeline 520 with the gas circulation pipeline, vacuum pump 510 directly extracts the gas in the gas circulation pipeline, can reduce the trompil quantity of the locular wall of heat transfer chamber, guarantees the gas tightness of heat transfer chamber, makes things convenient for equipment maintenance.
The vacuum pipeline 520 is connected to the condensation front section 413, and the gas density at the condensation front section 413 is relatively large, so that the vacuumizing efficiency can be improved, and the equipment operation cost is reduced.
In order to further reduce the operation cost of the equipment, in one embodiment, a first air valve 610 is arranged in the vacuum pipeline, and a second air valve 620 is arranged in the condensation front section. After the gas amount in the heat exchange chamber is reduced to a certain degree, the first gas valve 610 is closed, so that the heat exchange chamber maintains a low-pressure environment, and the heat generation rate is slowed down. Opening the first air valve 610 after the vacuum pump 510 is completely stopped can ensure proper operation of the vacuum pump 510.
In one embodiment, the heat exchange chamber is a cylinder with two closed ends, and comprises an upper wall 210, a lower wall 220 and a circumferential wall 230; the air inlet 411 is opened in the lower wall 220 and the air outlet is opened in the upper wall 210.
The air inlet 411 is formed in the lower wall 220, that is, a through hole is formed in the lower wall 220, and then the air inlet 411 of the air circulation pipeline is inserted into the through hole, so that the periphery of the pipeline is in sealed contact with the lower wall 220. The outlet is formed in the upper wall 210, that is, a through hole is formed in the upper wall 210, and then the outlet 412 of the gas circulation pipeline is inserted into the through hole, and the periphery of the pipeline is ensured to be in sealed contact with the upper wall 210.
Through setting up air inlet 411 at lower wall 220, make the low-temperature gas after condensing equipment 420 cools off get into from the lower extreme of heat transfer chamber, flow out from the upper end of heat transfer chamber, be favorable to low-temperature gas to be full of the studio, improve cooling efficiency.
To further improve the cooling efficiency, in one embodiment the spray head is located close to the outside of the rotor 100. The outer side of the rotor 100 refers to a portion of the rotor 100 away from the vertical axis. The linear velocity of the outer side of the rotor 100 is higher, the friction with the indoor gas is more severe, and the temperature is higher. The spray head is aimed at the outer side of the rotor 100 for spraying, so that the part can be more effectively prevented from being overheated, and the cooling efficiency is improved.
Further, in one embodiment, the spray head 441 is located below the rotor and sprays upwards. Driven by the gas circulation pipeline, the gas in the heat exchange chamber close to the circumferential wall 230 tends to flow from bottom to top, and the arrangement can promote the fog drops sprayed by the spray head 441 to flow through the outer side of the rotor along with the gas flow, so that the cooling effect on the outer side of the rotor is better.
A plurality of sets of evaporative cooling devices are uniformly arranged along the circumferential direction of the heat exchange chamber, and the gas circulation pipelines of the evaporative cooling devices are communicated with the heat exchange chamber.
In this embodiment, the air inlets are arranged annularly about the vertical axis and the air outlets are arranged annularly about the vertical axis. Through setting up many sets of evaporation cooling device, reduced the gas flow that the gas circulation pipeline needs to hold in every set of evaporation cooling device, made the flow field in the heat transfer chamber more even, guaranteed hypergravity centrifuge's experimental performance.
Specifically, in one embodiment, the heat exchange chamber has a longitudinal section (e.g., the plane of the paper in fig. 1) that passes through a vertical axis, and in the same set of evaporative cooling devices, the air inlet and the air outlet are in the same longitudinal section and on the same side of the vertical axis. Namely, in the same set of evaporative cooling device, the air inlet and the air outlet are positioned on the same longitudinal section. The distance between the air inlet and the air outlet is shortened as much as possible on the premise that sufficient pressure difference is ensured between the air inlet and the air outlet, and disturbance to an airflow field in the heat exchange chamber is small.
In one embodiment, the condensing device is an air conditioning box, and the size of the fog drops sprayed by the spray head is in the nanometer level.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features. When technical features in different embodiments are represented in the same drawing, it can be seen that the drawing also discloses a combination of the embodiments concerned.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The refrigeration system of the hypergravity centrifuge comprises a rotor rotating around a vertical axis and a heat exchange chamber covered outside the rotor, and is characterized in that the refrigeration system comprises a liquid cooling device and an evaporative cooling device; the liquid cooling device comprises a refrigeration source and a corresponding cooling liquid circulating pipeline, and the cooling liquid circulating pipeline penetrates through the wall of the heat exchange chamber to perform heat exchange;
the evaporative cooling apparatus includes:
the gas circulation pipeline is provided with a gas inlet and a gas outlet which are communicated with the heat exchange chamber;
the cooling liquid circulation pipeline and the gas circulation pipeline are thermally coupled through the condensing device;
the liquid storage device is connected to the gas circulation pipeline and is used for collecting condensate;
and the spraying pipeline comprises a liquid suction port connected to the liquid reservoir and a spraying head which is arranged in the heat exchange chamber and communicated with the liquid suction port.
2. The refrigeration system of a hypergravity centrifuge of claim 1 wherein the air inlet is closer to the vertical axis than the air outlet.
3. The system of claim 1, further comprising a vacuum pump coupled to the heat exchange chamber via a vacuum line to adjust the vacuum level in the heat exchange chamber.
4. The refrigeration system of the hypergravity centrifuge as recited in claim 3, wherein a section of the gas circulation line between the gas outlet and the condensing device is a condensing front section; the vacuum pipeline is communicated with the condensation front section.
5. The cooling system of the supergravity centrifuge as claimed in claim 3, wherein a first air valve is disposed in the vacuum pipeline, and a second air valve is disposed in the condensing front section.
6. The refrigeration system of the supergravity centrifuge as recited in claim 1, wherein the heat exchange chamber is cylindrical with two closed ends, and comprises an upper wall, a lower wall and a circumferential wall; the air inlet is arranged on the lower wall, and the air outlet is arranged on the upper wall.
7. The refrigeration system of a hypergravity centrifuge of claim 1 wherein the spray header is proximate the outside of the rotor.
8. The refrigeration system of a hypergravity centrifuge of claim 1, wherein the spray head is located below the rotor and sprays upwards.
9. The refrigeration system of the supergravity centrifuge as claimed in claim 1, wherein the evaporative cooling devices are uniformly arranged in a plurality of sets along the circumferential direction of the heat exchange chamber, and the gas circulation pipeline of each set of evaporative cooling device is communicated with the heat exchange chamber.
10. The system of claim 9, wherein the heat exchange chamber has a longitudinal section through the vertical axis, and the air inlet and the air outlet are located on the same longitudinal section and the same side of the vertical axis in the same set of evaporative cooling devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911224990.6A CN112892892A (en) | 2019-12-04 | 2019-12-04 | Refrigeration system of hypergravity centrifuge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911224990.6A CN112892892A (en) | 2019-12-04 | 2019-12-04 | Refrigeration system of hypergravity centrifuge |
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| CN112892892A true CN112892892A (en) | 2021-06-04 |
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| CN201911224990.6A Pending CN112892892A (en) | 2019-12-04 | 2019-12-04 | Refrigeration system of hypergravity centrifuge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114226074A (en) * | 2021-11-30 | 2022-03-25 | 浙江大学 | Temperature control system and temperature control method of supergravity centrifugal device based on heat source analysis |
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| CN211887459U (en) * | 2019-12-04 | 2020-11-10 | 浙江大学建筑设计研究院有限公司 | Refrigeration system of hypergravity centrifuge |
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2019
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| CN2447680Y (en) * | 2000-09-26 | 2001-09-12 | 肖灿 | Air conditioner with condensed water treating structure |
| CN2585105Y (en) * | 2002-11-13 | 2003-11-05 | 张然 | Device for humidifying by atomizing condensation water of air conditioner |
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