CN114198932B - Preservation box control method and preservation box - Google Patents

Preservation box control method and preservation box Download PDF

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Publication number
CN114198932B
CN114198932B CN202010979828.1A CN202010979828A CN114198932B CN 114198932 B CN114198932 B CN 114198932B CN 202010979828 A CN202010979828 A CN 202010979828A CN 114198932 B CN114198932 B CN 114198932B
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Prior art keywords
temperature compressor
low
temperature
met
speed
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CN114198932A (en
Inventor
刘占杰
包海平
袁顺涛
张扬
陈海涛
王稳夫
唐先双
李军锋
连继东
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Qingdao Haier Biomedical Co Ltd
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Qingdao Haier Biomedical Co Ltd
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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/18—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient
    • 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
    • F25B49/022—Compressor control arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a preservation box control method and a preservation box, wherein when a starting condition is met, a high-temperature compressor is controlled to start at a first set rotating speed; when the low-temperature compressor starting condition is not met, regulating the speed of the high-temperature compressor according to a first set step length and a first set speed regulating period until the low-temperature compressor starting condition is met or the exiting condition is met; when the starting condition of the low-temperature compressor is met, controlling the low-temperature compressor to start, and regulating the speed of the high-temperature compressor according to a second set step length and a second set speed regulating period; after the low-temperature compressor is started, regulating the speed of the low-temperature compressor according to a third set step length and a third set speed regulating period; the preservation box control method and the preservation box not only meet the refrigeration requirement, but also save energy and reduce consumption by controlling the rotating speeds of the high-temperature compressor and the low-temperature compressor.

Description

Preservation box control method and preservation box
Technical Field
The invention belongs to the technical field of preservation boxes, and particularly relates to a preservation box control method and a preservation box.
Background
The medical low-temperature preservation box is used for preserving biological samples, a perfect control method is needed, the refrigeration effect is guaranteed, otherwise, preservation of the biological samples is affected, and loss is caused.
The control method of the existing low-temperature preservation box generally adopts constant speed control. The existing constant speed control can meet the cooling speed, but has poor effects in the aspects of energy conservation and noise reduction.
Disclosure of Invention
The invention provides a control method of a preservation box, which not only meets the refrigeration requirement, but also saves energy and reduces consumption.
In order to solve the technical problems, the invention is realized by adopting the following technical scheme:
a preservation box control method, the preservation box having an cascade refrigeration system including a high temperature compressor and a low temperature compressor, the control method comprising:
judging whether the starting condition of the preservation box is met, and controlling the high-temperature compressor to start at a first set rotating speed when the starting condition is met;
after the high-temperature compressor is started at a first set rotating speed, judging whether the starting condition of the low-temperature compressor is met; when the low-temperature compressor starting condition is not met, regulating the speed of the high-temperature compressor according to a first set step length and a first set speed regulating period until the low-temperature compressor starting condition is met or the exiting condition is met; when the starting condition of the low-temperature compressor is met, controlling the low-temperature compressor to start, and regulating the speed of the high-temperature compressor according to a second set step length and a second set speed regulating period;
and after the low-temperature compressor is started, regulating the speed of the low-temperature compressor according to a third set step length and a third set speed regulating period.
Further, the starting condition is that the temperature in the storage box is equal to or higher than the starting temperature.
Still further, the low temperature compressor starting condition is that the actual temperature of the intermediate heat exchanger of the cascade refrigeration system is less than or equal to a starting threshold value.
Furthermore, the exit condition is that after the high-temperature compressor is regulated for a set time according to a first set step length and a first set speed regulation period, the start condition of the low-temperature compressor is still not satisfied.
And further, outputting a fault prompt after the exit condition is met, alarming, and exiting.
Further, after the starting condition is met, before the high-temperature compressor is controlled to start at the first set rotating speed, the control method further comprises the following steps:
judging whether the storage box is electrified for the first time;
if the storage box is not electrified for the first time, controlling the high-temperature compressor to start at a first set rotating speed;
if the storage box is electrified for the first time, controlling the high-temperature compressor to start at a second set rotating speed, keeping the second set rotating speed, and judging whether the starting condition of the low-temperature compressor is met; outputting a fault prompt to alarm when the starting condition of the low-temperature compressor is not met, and then exiting; and when the starting condition of the low-temperature compressor is met, controlling the low-temperature compressor to start.
Further, after the high-temperature compressor is started at the first set rotating speed, delaying for the first set delay time, and judging whether the starting condition of the low-temperature compressor is met; and after the low-temperature compressor is started, delaying for a second set delay time, and then regulating the speed of the low-temperature compressor according to a third set step length and a third set speed regulating period.
Further, when the high-temperature compressor is regulated, if the calculated rotation speed F1 of the high-temperature compressor is greater than Fmax, f1=fmax; if F1 < Fmin, let f1=fmin; when the low-temperature compressor is regulated, if the calculated rotating speed F2 of the low-temperature compressor is larger than Fmax, F2=fmax; if F2 < Fmin, let f2=fmin; wherein Fmax is a set rotational speed high threshold, and Fmin is a set rotational speed low threshold.
Still further, after the low-temperature compressor is started, when the shutdown condition is met, the low-temperature compressor and the high-temperature compressor are controlled to be shut down; if the storage box is electrified for the first time, the shutdown conditions comprise that the temperature in the storage box is less than or equal to the shutdown temperature, or the startup time of the low-temperature compressor reaches the first set startup time; if the storage box is not electrified for the first time, the shutdown condition comprises that the temperature in the storage box is less than or equal to the shutdown temperature, or the startup time of the low-temperature compressor reaches the second set startup time; wherein the first set start-up time is greater than or equal to the second set start-up time.
A holding tank having an cascade refrigeration system comprising a high temperature compressor and a low temperature compressor; the controller of the holding tank performs the control method described above.
Compared with the prior art, the invention has the advantages and positive effects that: according to the preservation box control method and the preservation box, when the starting condition is met, the high-temperature compressor is controlled to start at the first set rotating speed; when the low-temperature compressor starting condition is not met, regulating the speed of the high-temperature compressor according to a first set step length and a first set speed regulating period until the low-temperature compressor starting condition is met or the exiting condition is met; when the starting condition of the low-temperature compressor is met, controlling the low-temperature compressor to start, and regulating the speed of the high-temperature compressor according to a second set step length and a second set speed regulating period; after the low-temperature compressor is started, regulating the speed of the low-temperature compressor according to a third set step length and a third set speed regulating period; the preservation box control method and the preservation box not only meet the refrigeration requirement, but also save energy and reduce consumption by controlling the rotating speeds of the high-temperature compressor and the low-temperature compressor.
Other features and advantages of the present invention will become apparent upon review of the detailed description of the invention in conjunction with the drawings.
Drawings
FIG. 1 is a block diagram of a cascade refrigeration system of a holding tank;
FIG. 2 is a flow chart of one embodiment of a method of control of a save box in accordance with the present invention;
fig. 3 is a flowchart of another embodiment of the save box control method according to the present invention.
Reference numerals:
1. an anti-dew tube; 2. a condenser; 3. a filter; 4. a high temperature capillary; 5. an intermediate heat exchanger; 6. a gas-liquid separator;
7. a filter; 8. a pressure switch; 9. a low temperature capillary; 10. an evaporator; 11. precooling the condenser.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples.
The preservation box of the embodiment is provided with an overlapping refrigerating system, and the overlapping refrigerating system comprises a high-temperature compression system and a low-temperature compression system; referring to fig. 1, the high-temperature compression system comprises a high-temperature compressor, an anti-dew pipe 1, a condenser 2, a filter 3, a high-temperature capillary 4, an intermediate heat exchanger 5 and a gas-liquid separator 6 which are communicated in sequence; the low-temperature compression system comprises a low-temperature compressor, an oil separator, a filter 7, a pressure switch 8, an intermediate heat exchanger 5, a low-temperature capillary 9 and an evaporator 10 which are communicated in sequence. The pre-cooling condenser 11 is an optional component through which the compressor is discharged.
The filter plays a role in absorbing and blocking moisture impurities in the refrigerant and ensures the cleanliness of the refrigeration system.
The intermediate heat exchanger is a double-pipe heat exchanger and is provided with an outer loop and an inner loop, wherein the outer loop is internally circulated with the refrigerant of the high-temperature compression system, and the inner loop is internally circulated with the refrigerant of the low-temperature compression system. The intermediate heat exchanger is a place for realizing energy conversion by a high-temperature compression system and a low-temperature compression system.
The refrigerant flow path of the high temperature compression system is: high temperature compressor- & gt dew prevention pipe 1- & gt condenser 2- & gt filter 3- & gt high temperature capillary 4- & gt inlet A of intermediate heat exchanger 5- & gt outlet B of intermediate heat exchanger 5- & gt gas-liquid separator 6- & gt high temperature compressor.
The refrigerant flow path of the low temperature compression system is: low temperature compressor- & gt oil separator- & gt filter 7- & gt pressure switch 8- & gt inlet C of intermediate heat exchanger 5- & gt outlet D of intermediate heat exchanger 5- & gt low temperature capillary 9- & gt evaporator 10- & gt low temperature compressor.
R290 refrigerant in the high-temperature compression system is compressed by the high-temperature compressor and then becomes high-temperature high-pressure gas, the high-temperature gas is discharged by the high-temperature compressor and then is sent to the condenser 2 through the dew-proof pipe 1, and the high-temperature liquid is cooled by the condenser 2 and the like. The condensed liquid is throttled by a high-temperature capillary tube 4 to enter an intermediate heat exchanger 5 after being filtered by a filter 3, when the refrigerant passes through the high-temperature capillary tube 4, the pressure is reduced from the condensation pressure to the evaporation pressure and is evaporated in the intermediate heat exchanger 5, the refrigerant in the low-temperature compression system is cooled in the intermediate heat exchanger 5, and most of the refrigerant in the high-temperature compression system returns to the high-temperature compressor in a gaseous form through a gas-liquid separator 6 after being heated in the intermediate heat exchanger 5.
R170 refrigerant in the low-temperature compression system is compressed by the low-temperature compressor and then becomes high-temperature high-pressure gas, the high-temperature high-pressure gas is discharged by the low-temperature compressor and then is sent to the intermediate heat exchanger 5 through the oil separator, and the liquid is cooled into liquid through the intermediate heat exchanger 5 and the like. The condensed liquid is throttled by the cryocapillary 9 into the evaporator 10, and when the refrigerant passes through the cryocapillary 9, the pressure is reduced from the condensing pressure to the evaporating pressure, and is evaporated in the evaporator 10, the articles stored in the holding tank are cooled in the evaporator 10, and then returned to the cryocompressor in gaseous form.
The preservation box of the embodiment has the controller executing the preservation box control method described below, not only meets the refrigeration requirement, but also saves energy and reduces consumption, and provides guarantee for low-temperature storage of biological samples.
The control method of the preservation box of the present embodiment mainly includes the following steps, as shown in fig. 2.
Step S10: judging whether the starting condition of the preservation box is met.
In this embodiment, the storage box startup condition is that the box internal temperature of the storage box is equal to or higher than the startup temperature. When the temperature in the storage box is more than or equal to the starting temperature, the temperature in the storage box is high, and the starting condition of the storage box is met. Whether the starting condition is met or not is judged by judging whether the temperature in the storage box is not less than the starting temperature, whether the machine is started or not can be accurately judged, and the judgment accuracy is high.
And collecting the temperature in the storage box, and judging whether the temperature in the storage box is equal to or higher than the starting temperature. If the temperature in the storage box is not less than the starting temperature, the starting condition is met, and the step S11 is executed.
Step S11: when the starting condition is met, the high-temperature compressor is controlled to start at a first set rotating speed.
If the temperature in the storage box is not less than the starting temperature, which indicates that the temperature in the storage box is higher and meets the starting condition, the high-temperature compressor is controlled to start at a first set rotating speed.
After the high temperature compressor is started at the first set rotation speed, a first set delay time (for example, 1 min-5 min) is required to delay, and then step S12 is executed. That is, the high temperature compressor is operated for a period of time so as to lower the temperature of the outer surface of the intermediate heat exchanger, and then S12 is performed, thereby avoiding the high temperature compressor from entering into speed regulation too early to increase the operation load.
Step S12: judging whether the starting condition of the low-temperature compressor is met.
In this embodiment, the low temperature compressor start condition is that the actual temperature of the intermediate heat exchanger is less than or equal to the start threshold. Judging whether the starting condition of the low-temperature compressor is met, namely judging whether the actual temperature of the intermediate heat exchanger is less than or equal to a starting threshold value.
The intermediate heat exchanger is a double-pipe heat exchanger, so that the actual temperature of the intermediate heat exchanger is the temperature of the outer surface of the intermediate heat exchanger, and reflects the temperature of the refrigerant of the high-temperature compression system in the intermediate heat exchanger, and the refrigerant needs to be collected in real time; the temperature sensor is arranged on the outer surface of the outermost ring of the intermediate heat exchanger and is used for collecting the actual temperature of the intermediate heat exchanger.
The start-up threshold is the temperature value to which the external surface temperature of the intermediate heat exchanger is to be reached when the low temperature compressor is started up. Whether the starting condition of the low-temperature compressor is met or not is judged by judging whether the actual temperature of the intermediate heat exchanger is less than or equal to the starting threshold value, whether the low-temperature compressor is started or not can be accurately judged, and judgment accuracy is high.
If the actual temperature of the intermediate heat exchanger is greater than the start-up threshold, the low temperature compressor start-up condition is not satisfied, and step S13 is performed. And if the actual temperature of the intermediate heat exchanger is less than or equal to the starting threshold value, the starting condition of the low-temperature compressor is met, and the step S16 is executed.
Step S13: and if the actual temperature of the intermediate heat exchanger is larger than the starting threshold value and the starting condition of the low-temperature compressor is not met, the high-temperature compressor is regulated according to a first set step length and a first set speed regulation period until the starting condition or the exiting condition of the low-temperature compressor is met.
In this embodiment, the exit condition is that after the high temperature compressor is speed-regulated for a set time according to a first set step length and a first set speed-regulating period, the start condition of the low temperature compressor is still not satisfied, and at this time, the exit is required, so that the program cannot be exited due to the dead cycle. Therefore, when the high temperature compressor is regulated according to the first set step length and the first set speed regulation period, step S14 is also executed.
Step S14: judging whether the actual temperature of the intermediate heat exchanger is less than or equal to a starting threshold value after the speed of the high-temperature compressor is regulated for a set time; if not, the exit condition is satisfied, and step S15 is executed; if yes, go to step S16.
Step S15: after the exit condition is met, outputting a fault prompt, alarming, prompting that the high-temperature compression system fails, timely warning on-site staff, and not controlling the low-temperature compressor to start and then exiting. If the actual temperature of the intermediate heat exchanger is still greater than the starting threshold after the time (starting timing from the time of starting the speed regulation of the high-temperature compressor) is set, the high-temperature compressor is likely to be in fault, and the time is needed for repair.
Step S16: the actual temperature of the intermediate heat exchanger is less than or equal to the starting threshold value, which indicates that the refrigerating capacity of the high-temperature compressor meets the starting requirement of the low-temperature compressor, and the starting condition of the low-temperature compressor is met, and the low-temperature compressor is controlled to be started; and the high-temperature compressor is regulated according to the second set step length and the second set speed regulation period.
Step S17: after the low-temperature compressor is started, delaying for a second set delay time (for example, 1-5 min), and then regulating the speed of the low-temperature compressor according to a third set step length and a third set speed regulating period.
The second set delay time is to operate the low-temperature compressor for a period of time so as to reduce the temperature in the storage box, and then speed-regulating the low-temperature compressor, thereby avoiding the low-temperature compressor from entering the speed regulation too early to increase the operation load.
After the low temperature compressor is regulated, step S18 is performed: judging whether the shutdown condition is satisfied.
And if the shutdown condition is not met, continuously regulating the speed of the low-temperature compressor. If the shutdown condition is satisfied, step S19 is performed: and controlling the low-temperature compressor and the high-temperature compressor to stop.
In this embodiment, the set time is greater than the first set speed regulation period, the set time is 300 s-600 s, the value range of the first set speed regulation period is 30 s-100 s, the value range of the second set speed regulation period is 30 s-100 s, and the value range of the third set speed regulation period is 30 s-100 s. The first set speed regulation period and the second set speed regulation period are in the above range, so that the frequent speed regulation of the high-temperature compressor caused by too short period is avoided, the untimely speed regulation caused by too long period is avoided, and the temperature of the outer surface of the intermediate heat exchanger cannot be reduced rapidly. The third setting speed regulation period selects the range, so that the frequent speed regulation of the low-temperature compressor caused by too short period is avoided, the untimely speed regulation caused by too long period is avoided, and the temperature in the storage box can not be quickly reduced. The set speed regulating time is selected from the range, so that insufficient speed regulation caused by too short time is avoided, and incapability of timing error caused by too long time is avoided.
According to the control method of the preservation box, when the starting condition is met, the high-temperature compressor is controlled to start at the first set rotating speed; when the low-temperature compressor starting condition is not met, regulating the speed of the high-temperature compressor according to a first set step length and a first set speed regulating period until the low-temperature compressor starting condition is met or the exiting condition is met; when the starting condition of the low-temperature compressor is met, controlling the low-temperature compressor to start, and regulating the speed of the high-temperature compressor according to a second set step length and a second set speed regulating period; after the low-temperature compressor is started, regulating the speed of the low-temperature compressor according to a third set step length and a third set speed regulating period; the control method of the preservation box of the embodiment not only meets the refrigeration requirement, but also saves energy and reduces consumption by controlling the rotating speeds of the high-temperature compressor and the low-temperature compressor.
According to the preservation box control method, the actual temperature of the intermediate heat exchanger and the temperature in the preservation box are comprehensively considered to regulate the speed of the high-temperature compressor and the low-temperature compressor, so that the refrigeration requirement is met, and energy conservation and consumption reduction are realized.
According to the preservation box control method, the rotation speed of the low-temperature compressor is flexibly changed according to the temperature in the preservation box to change the refrigerating capacity of the preservation box, so that the refrigerating capacity can be adjusted according to the change of a load, the loss of start-up and stop is reduced, and the power consumption is reduced. Meanwhile, the rotating speeds of the high-temperature compressor and the low-temperature compressor are flexibly adjusted according to the actual temperature of the intermediate heat exchanger and the temperature in the storage box, so that the purposes of saving energy and reducing noise are achieved.
As a preferred design of this embodiment, since the storage tank needs to be quickly cooled when being powered on for the first time, so as to ensure the cooling speed, step S21 is required to be executed before the high-temperature compressor is controlled to start at the first set rotational speed after the start-up condition is satisfied, as shown in fig. 3.
Step S21: after the starting condition is met, judging whether the storage box is electrified for the first time.
Definition of first power-up: the battery switch and the power switch are both in an open state originally and provided with a first power-on mark, and at the moment, the power switch is closed and the machine is electrified to start running, which belongs to the first power-on; the first power-on mark is cleared by the program after the first stop of the compressor, and the power-on is no longer the first power-on.
If the save box is not powered on for the first time, step S11 is performed;
if the save box is first powered up, step S22 is performed.
Step S22: time delay t1 (for example, 1 min-15 min), and then controlling the high-temperature compressor to start at a second set rotating speed and keeping the second set rotating speed; then, delay t2 (e.g. 5 min-20 min), execute step S23: judging whether the starting condition of the low-temperature compressor is met.
If the low-temperature compressor starting condition is satisfied, that is, the actual temperature of the intermediate heat exchanger is less than or equal to the starting threshold, executing step S24: the low temperature compressor is controlled to start up while the high temperature compressor maintains the second set rotational speed, and then step S17 is performed.
If the low temperature compressor starting condition is not satisfied, that is, the actual temperature of the intermediate heat exchanger is greater than the starting threshold, step S25 is executed: and controlling the high-temperature compressor to stop, outputting a fault prompt, alarming to prompt that the high-temperature compression system fails, and stopping the low-temperature compressor.
After the low-temperature compressor is started, when the shutdown condition is met, the low-temperature compressor and the high-temperature compressor are controlled to be shut down. If the storage box is electrified for the first time, the shutdown condition comprises that the temperature in the storage box is less than or equal to the shutdown temperature, or the startup time of the low-temperature compressor reaches the first set startup time. If the storage box is not electrified for the first time, the shutdown condition comprises that the temperature in the storage box is less than or equal to the shutdown temperature, or the startup time of the low-temperature compressor reaches the second set startup time; wherein the first set start-up time is greater than or equal to the second set start-up time.
When the temperature in the storage box is less than or equal to the shutdown temperature, the refrigeration effect is realized, namely the shutdown condition is met, and both the high-temperature compressor and the low-temperature compressor are shut down. When the starting time of the low-temperature compressor reaches the first set starting time (first power-on)/the second set starting time (non-first power-on), if the temperature in the storage box is just less than or equal to the shutdown temperature at the moment, the shutdown condition is met; if the temperature in the incubator is higher than the shutdown temperature, the low-temperature compressor is in fault, the low-temperature compressor cannot effectively refrigerate, and the shutdown condition is met, so that the shutdown condition is met as long as the startup time of the low-temperature compressor reaches the first set startup time (first power-on)/the second set startup time (non-first power-on). Therefore, the stopping condition is different by judging whether the power is firstly applied, so that the accuracy of stopping control is improved.
In this embodiment, the first set step length, the second set step length, and the third set step length cannot exceed the normal range, so as to avoid too large or too small variation of the rotation speed of the compressor; the rotation speed of the high-temperature compressor and the low-temperature compressor cannot exceed the normal range, and if the rotation speed is too high or too low, the compressors are easily damaged. Thus, the first and second substrates are bonded together,
when the speed of the high-temperature compressor is regulated, if the calculated rotating speed F1 of the high-temperature compressor is larger than Fmax, F1=fmax; if F1 < Fmin, f1=fmin.
When the low-temperature compressor is regulated, if the calculated rotating speed F2 of the low-temperature compressor is larger than Fmax, F2=fmax; if F2 < Fmin, let f2=fmin; wherein Fmax is a set rotational speed high threshold, and Fmin is a set rotational speed low threshold.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (9)

1. A preservation box control method, the preservation box having an cascade refrigeration system comprising a high temperature compressor and a low temperature compressor, characterized in that: the control method comprises the following steps:
judging whether the starting condition of the preservation box is met, and controlling the high-temperature compressor to start at a first set rotating speed when the starting condition is met;
after the high-temperature compressor is started at a first set rotating speed, judging whether the starting condition of the low-temperature compressor is met; when the low-temperature compressor starting condition is not met, regulating the speed of the high-temperature compressor according to a first set step length and a first set speed regulating period until the low-temperature compressor starting condition is met or the exiting condition is met; when the starting condition of the low-temperature compressor is met, controlling the low-temperature compressor to start, and regulating the speed of the high-temperature compressor according to a second set step length and a second set speed regulating period;
after the low-temperature compressor is started, regulating the speed of the low-temperature compressor according to a third set step length and a third set speed regulating period;
the starting condition of the low-temperature compressor is that the actual temperature of an intermediate heat exchanger of the cascade refrigeration system is less than or equal to a starting threshold value.
2. The control method according to claim 1, characterized in that: the starting condition is that the temperature in the storage box is equal to or higher than the starting temperature.
3. The control method according to claim 1, characterized in that: the exit condition is that after the high-temperature compressor is regulated for a set time according to a first set step length and a first set speed regulation period, the start condition of the low-temperature compressor is still not satisfied.
4. The control method according to claim 1, characterized in that: and outputting a fault prompt after the exit condition is met, alarming, and exiting.
5. The control method according to claim 1, characterized in that: after the starting condition is met, before the high-temperature compressor is controlled to start at the first set rotating speed, the control method further comprises the following steps:
judging whether the storage box is electrified for the first time;
if the storage box is not electrified for the first time, controlling the high-temperature compressor to start at a first set rotating speed;
if the storage box is electrified for the first time, controlling the high-temperature compressor to start at a second set rotating speed, keeping the second set rotating speed, and judging whether the starting condition of the low-temperature compressor is met; outputting a fault prompt to alarm when the starting condition of the low-temperature compressor is not met, and then exiting; and when the starting condition of the low-temperature compressor is met, controlling the low-temperature compressor to start.
6. The control method according to claim 1, characterized in that:
after the high-temperature compressor is started at a first set rotating speed, delaying for a first set delay time, and judging whether the starting condition of the low-temperature compressor is met;
and after the low-temperature compressor is started, delaying for a second set delay time, and then regulating the speed of the low-temperature compressor according to a third set step length and a third set speed regulating period.
7. The control method according to claim 1, characterized in that:
when the speed of the high-temperature compressor is regulated, if the calculated rotating speed F1 of the high-temperature compressor is larger than Fmax, F1=fmax; if F1 < Fmin, let f1=fmin;
when the low-temperature compressor is regulated, if the calculated rotating speed F2 of the low-temperature compressor is larger than Fmax, F2=fmax; if F2 < Fmin, let f2=fmin;
wherein Fmax is a set rotational speed high threshold, and Fmin is a set rotational speed low threshold.
8. The control method according to any one of claims 1 to 7, characterized in that: after the low-temperature compressor is started, when the shutdown condition is met, controlling the low-temperature compressor and the high-temperature compressor to shut down;
if the storage box is electrified for the first time, the shutdown conditions comprise that the temperature in the storage box is less than or equal to the shutdown temperature, or the startup time of the low-temperature compressor reaches the first set startup time;
if the storage box is not electrified for the first time, the shutdown condition comprises that the temperature in the storage box is less than or equal to the shutdown temperature, or the startup time of the low-temperature compressor reaches the second set startup time; wherein the first set start-up time is greater than or equal to the second set start-up time.
9. A holding tank having an cascade refrigeration system comprising a high temperature compressor and a low temperature compressor; the method is characterized in that: a controller of the holding tank performs the control method according to any one of the preceding claims 1 to 8.
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