CN111322822B - Control method of cascade ultralow temperature refrigerator - Google Patents
Control method of cascade ultralow temperature refrigerator Download PDFInfo
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- CN111322822B CN111322822B CN202010122587.9A CN202010122587A CN111322822B CN 111322822 B CN111322822 B CN 111322822B CN 202010122587 A CN202010122587 A CN 202010122587A CN 111322822 B CN111322822 B CN 111322822B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005057 refrigeration Methods 0.000 claims abstract description 30
- 230000005494 condensation Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/001—Arrangement or mounting of control or safety devices for cryogenic fluid systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
- F25D11/04—Self-contained movable devices, e.g. domestic refrigerators specially adapted for storing deep-frozen articles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
- F25D19/04—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors with more than one refrigeration unit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/003—Arrangement or mounting of control or safety devices for movable devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2600/00—Control issues
- F25D2600/06—Controlling according to a predetermined profile
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention discloses a control method of a cascade ultralow temperature refrigerator, which comprises the following steps: detecting the real-time temperature T in the refrigerator; the refrigeration unit controls the start and stop of a high-temperature compressor and a low-temperature compressor in the refrigerator according to the temperature set value, the temperature control upper deviation and the temperature control lower deviation in the refrigerator and the received real-time temperature T in the refrigerator, so that the real-time temperature T in the refrigerator reaches the temperature set value in the refrigerator; starting the low-temperature compressor when the following conditions are simultaneously met: the high-temperature compressor is started and the working time is more than or equal to the shortest working time of the high-temperature compressor for starting the second-stage refrigeration; the real-time temperature value of the high-temperature evaporator is less than or equal to the minimum temperature value of the high-temperature evaporator when the low-temperature compressor is started; the real-time temperature T of the refrigerator is not less than the set temperature value in the refrigerator and the deviation of starting the low-temperature compressor.
Description
Technical Field
The invention relates to the field of refrigerator control, in particular to a control method of a cascade ultralow temperature refrigerator.
Background
The control method generally adopted in the field of refrigeration of refrigerators is as follows: after electrification, after the condensation fan is normally rotated and delayed by the starting of the compressor, when the temperature detection value in the box is greater than St + and the deviation on the starting low-temperature compressor is caused, starting the high-temperature compressor, and starting the low-temperature compressor after 30S delay; and when the temperature detection value in the box is less than St & lt & gt, closing the low-temperature compressor and closing the high-temperature compressor and the low-temperature compressor at the same time. The defects of the prior art at present: after the power is on, the condensation fan is rotated normally, so that the phenomenon of wasting electric energy is caused; when the high-temperature compressor and the low-temperature compressor are controlled, the high-temperature compressor does not achieve the optimal condensation effect, and when a low-temperature system is condensed, the low-temperature compressor is started, so that the refrigeration effect is poor, and electric energy is wasted; the high-temperature compressor and the low-temperature compressor are stopped simultaneously, impact can be caused to a unit, and the hidden danger that the safety and the firmness of a refrigerating system are poor is generated.
Disclosure of Invention
According to the problems in the prior art, the invention discloses a control method of a cascade ultralow temperature refrigerator, which specifically comprises the following steps:
detecting the real-time temperature T in the refrigerator;
a temperature set value, a temperature control upper deviation and temperature control lower deviation information are arranged in a refrigeration unit in the refrigerator, and the refrigeration unit controls the start and stop of a high-temperature compressor and a low-temperature compressor in the refrigerator according to the temperature set value, the temperature control upper deviation and the temperature control lower deviation in the refrigerator and the received real-time temperature T in the refrigerator, so that the real-time temperature T in the refrigerator reaches the temperature set value in the refrigerator;
and starting the high-temperature compressor when the following conditions are met simultaneously in the control process: the shutdown time of the high-temperature compressor is more than or equal to the starting minimum interval time of the high-temperature compressor; the temperature of the condenser does not reach a high-temperature protection value; real-time temperature T is greater than or equal to a temperature set value-starting deviation on a high-temperature compressor; when the high-temperature compressor is started, the condensing fan is started at the same time;
starting the low-temperature compressor when the following conditions are simultaneously met: the high-temperature compressor is started and the working time is more than or equal to the shortest working time of the high-temperature compressor for starting the second-stage refrigeration; the real-time temperature value of the high-temperature evaporator is less than or equal to the minimum temperature value of the high-temperature evaporator when the low-temperature compressor is started; the real-time temperature T of the refrigerator is not less than the set temperature value in the refrigerator and the deviation of starting the low-temperature compressor.
Further, when the real-time temperature T in the box is less than or equal to the temperature set value and the deviation is caused when the high-temperature compressor is closed, the refrigeration unit performs shutdown control on the high-temperature compressor.
Further, the low-temperature compressor is closed and shutdown control is performed on the low-temperature compressor when any one of the following conditions is met: when the real-time temperature T in the tank is less than or equal to the temperature set value, closing the lower deviation of the low-temperature compressor; the real-time temperature value of the high-temperature evaporator is not less than the highest temperature value of the high-temperature evaporator when the low-temperature press is closed.
By adopting the technical scheme, the method for controlling the cascade type ultralow temperature refrigerator accurately controls the two refrigeration systems of the ultralow temperature refrigerator, namely, the evaporator of the refrigeration system with the high-temperature compressor refrigerates the condenser of the refrigeration system with the low-temperature compressor, so that the condensation refrigeration capacity of the low-temperature compressor is improved, and the real-time regulation and control of the temperature in the refrigerator are realized; the control logic disclosed by the invention can be used for accurately achieving the set temperature and achieving the energy-saving effect of the refrigerator.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of the method of the present invention.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following describes the technical solutions in the embodiments of the present invention clearly and completely with reference to the drawings in the embodiments of the present invention:
a control method of a cascade ultra-low temperature refrigerator can be matched with the device shown in figure 1 to work in practical application, and specifically comprises the following steps:
s1, firstly, detecting the real-time temperature T in the refrigerator by using a temperature sensor, and then transmitting the real-time temperature T to a refrigerating unit in the refrigerator;
and S2, setting temperature set value, temperature control upper deviation and temperature control lower deviation, the shortest working time of the high-temperature compressor for the second-stage refrigeration, the highest temperature of the high-temperature evaporator when the temperature of the condenser does not reach the high-temperature protection value and the low-temperature compressor is closed, and the like in the refrigeration unit of the refrigerator. The refrigeration unit controls the start and stop of a high-temperature compressor and a low-temperature compressor in the refrigerator according to the temperature set value, the temperature control upper deviation and the temperature control lower deviation in the refrigerator and the received real-time temperature T in the refrigerator, so that the real-time temperature T in the refrigerator reaches the temperature set value in the refrigerator.
When the high-temperature and low-temperature compressors are controlled, if the high-temperature compressor is started, the following 3 conditions are simultaneously met:
A) the shutdown time of the high-temperature compressor is more than or equal to the starting minimum interval time (default value is 3 minutes) of the high-temperature compressor: the minimum interval time is started to protect the compressor, and the compressor is prevented from being repeatedly started and stopped, so that the service life of the compressor is prevented from being influenced.
B) The condenser of the high-temperature system is not protected at high temperature (when the high temperature of the condenser is detected, an alarm is given first, and if the temperature continues to rise, the high-temperature system enters a protection state): the normal work of the high-temperature refrigeration system loop and the normal work of the high-temperature loop condenser are ensured.
C) The real-time temperature T detected by the temperature sensor is larger than or equal to a set temperature value in the box, the deviation (default value is 0.4 ℃) of the high-temperature compressor is started, and meanwhile, when the high-temperature compressor is started, the condensing fan is started.
If the low-temperature compressor is started, the following 3 conditions are simultaneously satisfied:
A) the high-temperature compressor is started and the working time is more than or equal to the shortest working time of the high-temperature compressor for starting the second-stage refrigeration: the normal cycle work of the high-temperature refrigeration system is ensured, and the condensing capacity of the low-temperature refrigeration system meets the requirement;
B) the real-time temperature value of the high-temperature evaporator is less than or equal to the minimum temperature value (default value-34 ℃) of the high-temperature evaporator when the low-temperature compressor is started, and the low-temperature refrigeration system is started only when the high-temperature refrigeration loop is ensured to be normal;
C) the real-time temperature T of the refrigerator is more than or equal to the temperature set value in the refrigerator and the deviation of starting the low-temperature compressor (the default value is 1.4 ℃).
Further, when the real-time temperature T in the box is less than or equal to the temperature set value and the deviation is caused when the high-temperature compressor is closed, the refrigeration unit performs shutdown control on the high-temperature compressor.
Further, the low-temperature compressor is closed and shutdown control is performed on the low-temperature compressor when any one of the following conditions is met: when the real-time temperature T in the tank is less than or equal to the temperature set value, closing the lower deviation of the low-temperature compressor; the real-time temperature value of the high-temperature evaporator is not less than the highest temperature value of the high-temperature evaporator when the low-temperature press is closed. (default-12 ℃ C.)
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. A control method of a cascade ultralow temperature refrigerator is characterized by comprising the following steps:
detecting the real-time temperature T in the refrigerator;
a temperature set value, a temperature control upper deviation and temperature control lower deviation information are arranged in a refrigeration unit in the refrigerator, and the refrigeration unit controls the start and stop of a high-temperature compressor and a low-temperature compressor in the refrigerator according to the temperature set value, the temperature control upper deviation and the temperature control lower deviation in the refrigerator and the received real-time temperature T in the refrigerator, so that the real-time temperature T in the refrigerator reaches the temperature set value in the refrigerator;
and starting the high-temperature compressor when the following conditions are met simultaneously in the control process: the shutdown time of the high-temperature compressor is more than or equal to the starting minimum interval time of the high-temperature compressor; the temperature of the condenser does not reach a high-temperature protection value; real-time temperature T is greater than or equal to a temperature set value-starting deviation on a high-temperature compressor; when the high-temperature compressor is started, the condensing fan is started at the same time;
starting the low-temperature compressor when the following conditions are simultaneously met: the high-temperature compressor is started and the working time is longer than or equal to the shortest working time of the high-temperature compressor for starting the second-stage refrigeration, so that the high-temperature refrigeration system is ensured to work normally in a circulating manner, and the condensing capacity of the low-temperature refrigeration system meets the requirement; the real-time temperature value of the high-temperature evaporator is less than or equal to the minimum temperature value of the high-temperature evaporator when the low-temperature compressor is started, so that the low-temperature refrigeration system is started only when the high-temperature refrigeration loop is ensured to be normal; the real-time temperature T of the refrigerator is not less than the set temperature value in the refrigerator and the deviation of starting the low-temperature compressor.
2. The method as claimed in claim 1, further characterized in that: and when the real-time temperature T in the box is less than or equal to the temperature set value and the deviation is generated under the condition of closing the high-temperature compressor, the refrigeration unit performs shutdown control on the high-temperature compressor.
3. The method as claimed in claim 1, further characterized in that:
and when any one of the following conditions is met, closing the low-temperature compressor and performing shutdown control on the low-temperature compressor:
when the real-time temperature T in the tank is less than or equal to the temperature set value, closing the lower deviation of the low-temperature compressor;
the real-time temperature value of the high-temperature evaporator is not less than the highest temperature value of the high-temperature evaporator when the low-temperature press is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010122587.9A CN111322822B (en) | 2020-02-27 | 2020-02-27 | Control method of cascade ultralow temperature refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010122587.9A CN111322822B (en) | 2020-02-27 | 2020-02-27 | Control method of cascade ultralow temperature refrigerator |
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| Publication Number | Publication Date |
|---|---|
| CN111322822A CN111322822A (en) | 2020-06-23 |
| CN111322822B true CN111322822B (en) | 2021-09-14 |
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| CN202010122587.9A Active CN111322822B (en) | 2020-02-27 | 2020-02-27 | Control method of cascade ultralow temperature refrigerator |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111981721A (en) * | 2020-08-31 | 2020-11-24 | 浙江英诺绿能科技有限公司 | Movable integrated carbon dioxide precooler |
| CN114198932B (en) * | 2020-09-17 | 2023-08-11 | 青岛海尔生物医疗股份有限公司 | Preservation box control method and preservation box |
| CN114151987B (en) * | 2021-11-12 | 2023-05-12 | 青岛澳柯玛生物医疗有限公司 | Parallel control method for compressor units |
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| CN1470833A (en) * | 2002-07-24 | 2004-01-28 | Lg������ʽ���� | Refrigerator operation control method |
| CN101865589A (en) * | 2010-07-14 | 2010-10-20 | 天津商业大学 | Environmental protection, fluorine-free ultra-low temperature storage |
| CN102829572A (en) * | 2012-09-06 | 2012-12-19 | 昆山一恒仪器有限公司 | Energy-saving ultralow-temperature preservation box |
| CN110375469A (en) * | 2019-06-24 | 2019-10-25 | 广东伊莱智科科技有限公司 | A kind of frequency conversion overlapping machine control method, device, equipment and storage medium |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040211193A1 (en) * | 2003-04-23 | 2004-10-28 | Ams Research Corporation | Cryocooler with oil lubricated compressor |
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2020
- 2020-02-27 CN CN202010122587.9A patent/CN111322822B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1470833A (en) * | 2002-07-24 | 2004-01-28 | Lg������ʽ���� | Refrigerator operation control method |
| CN101865589A (en) * | 2010-07-14 | 2010-10-20 | 天津商业大学 | Environmental protection, fluorine-free ultra-low temperature storage |
| CN102829572A (en) * | 2012-09-06 | 2012-12-19 | 昆山一恒仪器有限公司 | Energy-saving ultralow-temperature preservation box |
| CN110375469A (en) * | 2019-06-24 | 2019-10-25 | 广东伊莱智科科技有限公司 | A kind of frequency conversion overlapping machine control method, device, equipment and storage medium |
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| CN111322822A (en) | 2020-06-23 |
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