CN116358204A - Compressor control method, storage box and storage medium - Google Patents
Compressor control method, storage box and storage medium Download PDFInfo
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- CN116358204A CN116358204A CN202310338153.6A CN202310338153A CN116358204A CN 116358204 A CN116358204 A CN 116358204A CN 202310338153 A CN202310338153 A CN 202310338153A CN 116358204 A CN116358204 A CN 116358204A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000005057 refrigeration Methods 0.000 claims abstract description 86
- 238000004321 preservation Methods 0.000 claims abstract description 22
- 239000013589 supplement Substances 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims description 41
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000004590 computer program Methods 0.000 claims description 4
- 239000000523 sample Substances 0.000 description 11
- 230000009471 action Effects 0.000 description 7
- 230000001502 supplementing effect Effects 0.000 description 6
- 238000007710 freezing Methods 0.000 description 5
- 230000008014 freezing Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 4
- 230000005494 condensation Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000012472 biological sample Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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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
- F25B49/022—Compressor control arrangements
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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
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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
- F25D23/00—General constructional features
- F25D23/02—Doors; Covers
-
- 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
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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 compressor control method, a preservation box and a storage medium, wherein the compressor control method of the preservation box comprises the following steps: after detecting the door opening signal of the door, the refrigerating system of the storage box enters door opening refrigeration control; acquiring the working state of the refrigeration system, and adjusting the operation frequency of a compressor of the refrigeration system according to the working state, the continuous door opening time and the compartment door side temperature Td so as to supplement cold energy to a compartment of the storage box; the duration door opening time is the duration time of the door opening signal, and the door side temperature Td of the compartment is the temperature of the compartment near the door. The invention can accurately supplement cold energy to the compartment of the preservation box, improve the uniformity of the temperature in the compartment, reduce the frequent start-up or frequency increase times of the compressor, and prolong the service life of the compressor.
Description
Technical Field
The present invention relates to the field of refrigeration systems, and more particularly, to a compressor control method, a storage box, and a storage medium.
Background
The refrigerating system used by the low-temperature preservation box is mainly an overlapping refrigerating system, the adopted cooling mode is direct cooling, a plurality of layers of freezing shelves are arranged in the compartment, a plurality of freezing boxes for preserving biological samples are densely arranged on each layer of shelves, and the low-temperature preservation box is commonly used in hospitals.
The traditional low-temperature preservation box is characterized in that a temperature sensing bag is arranged at the back or the side of a compartment as a box temperature detection element, when a sample is stored or sampled, a box door and a compartment door are opened, the temperature of the compartment, which is close to an external sample, is rapidly reduced, the temperature change of the compartment, which is close to an internal sample, is not obvious, and the uniformity of the box temperature is greatly reduced, so that the operation of a compressor is controlled according to the temperature of the back side of the compartment or the temperature of the middle part of the compartment, which is detected by the temperature sensing bag, the uniformity of the compartment temperature cannot be improved, and even the reliable preservation of the compartment, which is close to the external sample, is influenced.
In the prior art, a refrigerator for controlling the working state of a compressor according to the door opening action has appeared, when the refrigerator has the door opening action during the operation period, an increment value of the rotating speed of the compressor is given based on the time of opening the door, the leaked cold quantity of the refrigerator is supplemented, the severe temperature fluctuation is avoided, the influence of the door opening action on the temperature of the refrigerator is reduced, but the temperature uniformity in the refrigerator still cannot be effectively improved simply by controlling the rotating speed according to the door opening time.
Disclosure of Invention
In order to solve the defect that the temperature uniformity in a box cannot be effectively improved in the prior art, the invention provides a compressor control method, a storage box and a storage medium.
The invention adopts the technical scheme that the method for controlling the compressor of the preservation box comprises the following steps:
after detecting the door opening signal of the door, the refrigerating system of the storage box enters door opening refrigeration control;
acquiring the working state of the refrigeration system, and adjusting the operation frequency of a compressor of the refrigeration system according to the working state, the continuous door opening time and the compartment door side temperature Td so as to supplement cold energy to a compartment of the storage box;
the duration door opening time is the duration time of the door opening signal, and the door side temperature Td of the compartment is the temperature of the compartment near the door.
Further, adjusting the compressor operating frequency of the refrigeration system based on the operating condition, the duration door opening time, and the compartment door side temperature Td includes:
when the refrigerating system is in an operation stage, judging whether a cooling and adding condition is reached, wherein the cooling and adding condition is that the continuous door opening time is more than or equal to a first preset time tk1 or the continuous door opening time is less than or equal to the first preset time tk1, and the compartment door side temperature Td of at least one compartment is more than or equal to a compartment temperature set value Ts+Tg1, if yes, executing a first frequency raising strategy;
and/or when the refrigerating system is in a shutdown stage, judging whether a cold supply starting condition is reached, wherein the cold supply starting condition is that the continuous door opening time is more than or equal to a second preset time tk2 or the continuous door opening time is less than or equal to the second preset time tk2, and the compartment door side temperature Td of at least one compartment is more than or equal to a compartment temperature set value Ts+Tg2, if yes, executing a second frequency raising strategy;
wherein, tg1 and Tg2 are both preset adjustment amounts.
Further, the door side temperature Td of the compartment is detected when the door is kept stand for a third preset time after receiving the door closing signal of the door; or the chamber door side temperature Td is detected when the fluctuation range of the chamber door side temperature Td is within the set threshold value and is maintained for the fourth preset time after the door closing signal of the door is received.
Further, the compressor control method further includes:
after executing the first frequency up strategy and/or the second frequency up strategy;
judging whether the back side temperature Tb of the compartment is less than or equal to the set box temperature value Ts-T at intervals of set intervals;
if yes, executing a frequency-reducing strategy;
if not, maintaining the current operating frequency;
wherein the temperature Tb of the back side of the compartments is the temperature of one compartment far away from the door, and T is a preset adjustment amount.
Further, the compressor control method further includes: when the current running frequency is judged to be maintained, judging whether the conventional refrigeration condition is reached, wherein the conventional refrigeration condition is that the chamber door side temperature Td is less than or equal to the box temperature set value Ts-T1 and the continuous time tx1 is maintained, or that the chamber door side temperature Td is less than or equal to the box temperature set value Ts-T2 and the continuous time tx2 is maintained, and if yes, the refrigeration system exits the door opening refrigeration control.
Wherein, T1 and T2 are both preset adjustment amounts.
In some embodiments, the refrigeration system employs an cascade refrigeration system having a high temperature stage compressor and a low temperature stage compressor; the first up-conversion strategy includes: simultaneously increasing the operating frequency of the high-temperature-stage compressor and the low-temperature-stage compressor; the second up-conversion strategy includes: sequentially increasing the operating frequencies of the high-temperature-stage compressor and the low-temperature-stage compressor; the frequency-reducing strategy comprises the following steps: the operating frequencies of the high temperature stage compressor and the low temperature stage compressor are successively reduced.
Further, the high-temperature stage compressor and the low-temperature stage compressor in the first frequency raising strategy are gradually raised to full frequency at the same frequency raising speed.
Further, the high-temperature-stage compressor in the second frequency-raising strategy is started first and gradually raised to full frequency, and after the high-temperature-stage compressor is started to reach the preset running time t, the low-temperature-stage compressor is started again and gradually raised to full frequency; the frequency raising speed of the high-temperature-stage compressor is higher than that of the low-temperature-stage compressor.
Further, the preset running time t is determined according to the back side temperature Tb of the chamber detected before the high-temperature-stage compressor is started, and the preset running time t corresponding to the back side temperature Tb of the chamber is obtained from a pre-established temperature time comparison relation; wherein, the lower the chamber backside temperature Tb, the shorter the corresponding preset running time t.
Further, the high-temperature-level compressor and the low-temperature-level compressor in the frequency-reducing strategy reduce the operating frequency at the same frequency-reducing speed, wait for the set waiting time after each frequency reduction, and re-judge whether the temperature Tb at the back side of the compartment is less than or equal to the set box temperature value Ts-T.
Further, the compressor control method further includes:
when the refrigerating system is in the operation stage, judging whether the cooling and adding quantity condition is reached, and if not, exiting the door opening refrigeration control of the refrigerating system;
and/or when the refrigerating system is in a shutdown stage, judging whether the cooling starting condition is reached, and if not, exiting the door opening refrigeration control.
The invention also proposes a preservation box comprising: the compressor control method is performed by a controller of the preservation box, which has a box body having at least one compartment, a box door connected to the box body, a door body sensor detecting a state of opening and closing of the box door, and a refrigerating system for cooling the compartment.
Further, a compartment small door is arranged on one side of the compartment close to the compartment door, a door side temperature sensing bulb arranged close to the compartment small door is arranged in each compartment, and a back side temperature sensing bulb arranged far away from the compartment small door is arranged in at least one compartment.
In some embodiments, the holding tank is provided with more than two compartments from top to bottom, and the backside temperature sensing bulb is disposed inside one compartment at a central location.
In some embodiments, the refrigeration system employs an cascade refrigeration system having a high temperature stage compressor and a low temperature stage compressor.
The invention also proposes a storage medium for storing a computer program which, when run, performs the compressor control method described above.
Compared with the prior art, the invention has the following beneficial effects:
1. after the refrigerator door is opened, the factors such as the working state, the continuous door opening time and the temperature Td of the side of the compartment of the refrigeration system are comprehensively considered, and under the condition that the continuous door opening time is overlong or the temperature Td of the side of the compartment is obviously increased, different frequency-increasing strategies are executed according to the current working state of the refrigeration system so as to accurately supplement cold energy to the compartment of the storage box, improve the uniformity of the temperature in the compartment, reduce the frequency of frequent starting or frequency increasing of the compressor, and prolong the service life of the compressor;
2. the preservation box adopts the cascade refrigeration system to supply cold, designs the frequency-raising strategy aiming at the operation characteristics of the cascade refrigeration system, and ensures the operation reliability of the refrigeration system while rapidly supplementing the cold supply.
Drawings
The invention is described in detail below with reference to examples and figures, wherein:
FIG. 1 is a schematic view of the interior of a holding tank of the present invention;
FIG. 2 is a schematic diagram of the cascade refrigeration system connection of the present invention;
FIG. 3 is a flow chart of the control method of the present invention.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, the compressor control method provided by the invention is suitable for refrigeration equipment, including but not limited to a preservation box, the preservation box 1 is provided with a box door 11, a plurality of compartments 12 and a refrigeration system, the box door 11 is movably arranged on the box body of the preservation box 1, the box door 11 is provided with a door body sensor, the door body sensor detects the opening and closing state of the box door 11 and sends out a corresponding door opening signal or door closing signal, the compartments 12 are positioned in the box body, a user can take and place samples in the compartments after opening the box door 11, the refrigeration system intensively cools all the compartments 12, and the box temperature set value Ts of each compartment 12 is the same.
Specifically, the compressor control method includes the steps of:
after detecting the door opening signal of the door 11, the refrigerating system of the storage box 1 enters door opening refrigeration control;
and acquiring the working state of the refrigeration system, and adjusting the operation frequency of a compressor of the refrigeration system according to the working state, the continuous door opening time and the compartment door side temperature Td so as to supplement the cooling capacity to the compartment of the storage box.
It should be understood that the duration of the door opening signal is the duration of the door opening signal, i.e., from zero when the door 11 is opened until the door 11 is closed. The temperature Td at the side of the compartment door is the temperature of the compartment near the compartment door, the influence of door opening and closing actions is the greatest, the temperature fluctuation is obvious, the temperature fluctuation is used as one of the adjusting factors of the operation frequency of the compressor, and the cooling capacity supplement and the time and the temperature uniformity of the compartment can be ensured. In some application scenarios, a small compartment door 13 is disposed on a side of each compartment 12 near the door 11, that is, when taking a sample, the door 11 needs to be opened first, then the corresponding small compartment door 13 is opened, a door side temperature sensing bulb 14 disposed near the small compartment door 13 is disposed inside each compartment 12, and the door side temperature Td of the compartment is detected by the door side temperature sensing bulb 14.
In some embodiments of the present invention, control logic for adjusting the compressor operating frequency of the refrigeration system based on operating conditions, duration of door opening time, and compartment door side temperature Td is as follows.
When the refrigerating system is in an operation stage, judging whether a cooling and adding quantity condition is reached, wherein the cooling and adding quantity condition is that the continuous door opening time is more than or equal to a first preset time tk1 or the continuous door opening time is less than or equal to the first preset time tk1, the door side temperature Td of at least one compartment is more than or equal to a box temperature set value Ts+Tg1, tg1 is a preset adjustment quantity, if so, executing a first frequency raising strategy, and raising the operation frequency of the compressor so as to supplement cooling quantity for the compartment of the storage box, and if not, exiting door opening refrigeration control of the refrigerating system.
The above cooling and adding conditions actually have two conditions, namely that the continuous opening time is more than or equal to the first preset time tk1, that the continuous opening time is less than or equal to the first preset time tk1, and that the chamber door side temperature Td of at least one chamber is more than or equal to the chamber temperature set value Ts+
Tg1, either one of the two conditions is satisfied, namely, it is judged that the cooling addition condition is reached, and neither one of the two conditions is satisfied, namely, it is judged that the cooling addition condition is not reached.
In more detail, the control logic is executed as follows:
judging whether the duration of the door opening is more than or equal to a first preset time tk1 when the refrigerating system is in an operation stage;
if yes, the fact that the door opening time is too long is indicated, the condition of cooling and adding quantity is judged to be achieved, a first frequency raising strategy is executed, and cooling quantity is added to a compartment of the storage box;
if not, judging whether the room door side temperature Td of at least one room is more than or equal to the box temperature set value Ts+Tg1, if so, indicating that the outside temperature of at least one room is obviously increased, judging that the cooling and adding quantity condition is reached, executing a first frequency increasing strategy, supplementing the cooling quantity to the room of the preservation box by increasing the operating frequency of the compressor, if not, indicating that the cooling system does not reach the cooling and adding quantity condition, and exiting the door opening refrigeration control.
When the refrigerating system is in a shutdown stage, judging whether a cold supply starting condition is reached, wherein the cold supply starting condition is that the continuous door opening time is more than or equal to a second preset time tk2 or the continuous door opening time is less than or equal to the second preset time tk2, the compartment door side temperature Td of at least one compartment is more than or equal to a box temperature set value Ts+Tg2, and Tg2 is a preset adjustment amount, if so, executing a second frequency raising strategy, starting and raising the running frequency of the compressor so as to supplement cold energy to the compartment of the storage box, and if not, exiting door opening refrigeration control of the refrigerating system.
The above cold supply start conditions have two conditions, namely, the continuous door opening time is more than or equal to the second preset time tk2, the continuous door opening time is less than or equal to the second preset time tk2, and the room door side temperature Td of at least one room is more than or equal to the box temperature set value Ts+
Tg2, either one of the two conditions is satisfied, namely, the condition that the cooling start condition is reached is judged, and neither one of the two conditions is satisfied, namely, the condition that the cooling start condition is not reached is judged.
In more detail, the control logic is executed as follows:
judging whether the continuous door opening time is more than or equal to a second preset time tk2 when the refrigerating system is in a shutdown stage;
if yes, the fact that the door opening time is too long is indicated, the fact that the cooling starting condition is achieved is judged, a second frequency raising strategy is executed, and cooling capacity is supplemented to the compartment of the storage box by starting and raising the running frequency of the compressor;
if not, judging whether the room door side temperature Td of at least one room is more than or equal to the box temperature set value Ts+Tg2, if so, indicating that the outside temperature of at least one room is obviously increased, judging that the cooling starting condition is reached, executing a second frequency raising strategy, supplementing the cooling capacity to the room of the storage box by starting and raising the running frequency of the compressor, if not, indicating that the cooling system does not reach the cooling starting condition, and exiting the door opening refrigeration control.
It should be noted that, the control logic of the operation stage and the shutdown stage are independent, only one control logic or two control logics can be selected in practical application, taking the control logic of the operation stage as an example, after the door opening signal of the door 11 is detected, the working state of the refrigeration system is obtained, and when the refrigeration system is in the operation stage, the control logic corresponding to the operation stage is executed.
In some embodiments of the present invention, the door side temperature Td of the compartment in the control logic is detected when the door is left to stand for a third predetermined time after receiving the door closing signal of the compartment door. That is, the door 11 of the storage box 1 is opened and then starts to count the continuous door opening time, during the period that the continuous door opening time does not reach the corresponding preset time tk1/tk2, if the door closing signal is not received in the period, the door side temperature Td of the compartment is not detected, the continuous door opening time reaches the corresponding preset time tk1/tk2, the operation frequency of the compressor is adjusted again, the frequency of the frequency rising of the compressor is reduced, if the door closing signal is received in the period, the door side temperature Td of the compartment is detected when the third preset time is kept stand, and the design has the advantages of ensuring that the detected door side temperature Td of the compartment can truly reflect the temperature of the sample outside the compartment, and supplementing the cooling capacity to the compartment in time, and improving the uniformity of the temperature of the compartment.
In still other embodiments of the present invention, the chamber door side temperature Td in the control logic is detected when the fluctuation range of the chamber door side temperature Td is within the set threshold value and is maintained for the fourth preset time after receiving the door closing signal of the door 11. That is, the door of the storage box is opened and then starts to count the continuous door opening time, during the period that the continuous door opening time does not reach the corresponding preset time tk1/tk2, if the door closing signal is not received in the period, the temperature Td of the side of the compartment door is not detected, the continuous door opening time reaches the corresponding preset time tk1/tk2, the running frequency of the compressor is regulated, the frequency of the frequency rising of the compressor is reduced, if the door closing signal is received in the period, after the temperature Td of the side of the compartment door is stabilized, the fluctuation range of the temperature Td of the side of the compartment door is within the set threshold and the fourth preset time is maintained, the temperature Td of the side of the compartment door is detected, and the design has the advantages of ensuring that the detected temperature Td of the side of the compartment door can truly reflect the temperature of the sample outside the compartment, supplementing the cooling capacity to the compartment in time and improving the uniformity of the temperature of the compartment.
Based on the above-mentioned control logic of the compressor operating frequency, since the temperature inside the compartment 12 is slightly affected by the door opening action, in order to reduce the temperature outside the compartment, the compressor will inevitably cause further reduction of the temperature inside the compartment 12 after a period of full frequency operation, in order to ensure that the sample inside the compartment inside the storage box is not lower than the low temperature limit value of the sample itself, so when the temperature Tb at the back side of the compartment is lower than a certain set value, i.e., tb < Ts-T, where T can be set according to the limit value of the reliable storage of the sample at low temperature, some embodiments of the present invention propose further optimization schemes, and the compressor control method further includes:
after executing the first frequency up strategy and/or the second frequency up strategy;
judging whether the back side temperature Tb of the compartment is less than or equal to the set box temperature value Ts-T at intervals of set intervals, wherein T is a preset adjustment quantity;
if yes, the temperature of the chamber is obviously reduced, and a frequency reduction strategy is implemented to prevent excessive cold energy supplement, so that the temperature of the back side of the chamber is too low;
if not, the temperature of the room is stable, and the current running frequency is maintained so as to ensure the temperature of the room to be stable.
It should be understood that the temperature Tb of the back side of the compartment is the temperature of the compartment far away from the door, the influence of door opening and closing actions is minimal, and the temperature fluctuation is not obvious, so that the temperature fluctuation is taken as one of the adjusting factors of the operation frequency of the compressor, the cooling capacity can be effectively controlled to supplement moderately, the temperature stability of the compartment is maintained, and the freezing quality of the sample is ensured. In practical application, the compartments in the case are intensively cooled by the refrigeration system, the compartments 12 are mutually communicated, and the back side temperature Tb of the compartments tends to be uniform, so that the back side temperature Tb of one of the compartments is generally taken, that is, at least one compartment 12 is internally provided with a back side temperature sensing bulb 15 arranged far from the compartment door 13.
Based on the above embodiments, in order to more accurately control the refrigeration system to exit the door opening refrigeration control and resume the conventional refrigeration cycle, further embodiments of the present invention provide a further optimization scheme, and the compressor control method further includes: when the current running frequency is judged to be maintained, judging whether the normal refrigerating condition is reached, wherein the normal refrigerating condition is that the temperature Td of the chamber door side is less than or equal to a set value Ts-T1 of the chamber temperature and is maintained for a continuous time tx1, or the temperature Td of the chamber door side is less than or equal to a set value TS-T2 of the chamber temperature and is maintained for a continuous time tx2, and if the temperature Td of the chamber door side is less than or equal to the set value TS-T of the chamber temperature and is maintained for the continuous time tx2, the refrigerating system exits the door opening refrigerating control, if the temperature Td of the chamber door side is less than or equal to the set value TS-T of the chamber temperature at set intervals, returning to the step of judging whether the temperature Tb of the chamber back side is less than or equal to the set value TS-T of the chamber temperature.
The conventional refrigeration condition in the above is actually provided with two conditions, namely that the temperature Td of the side of the compartment door is less than or equal to a set value Ts-T1 of the compartment temperature and is maintained for a continuous time tx1, that the temperature Td of the side of the compartment door is less than or equal to a set value TS-T2 of the compartment temperature and is maintained for a continuous time tx2, that either one of the two conditions is met, the refrigeration system is judged to reach the conventional refrigeration condition, the door-opening refrigeration control is exited, the conventional refrigeration control is restored, that is, the conventional refrigeration condition is not met is judged, and the step of judging whether the temperature Tb of the back side of the compartment is less than or equal to the set value TS-T of the compartment temperature at intervals is returned, that is, the refrigeration system is still in the door-opening refrigeration control.
It should be understood that the case temperature set point Ts-T1 may be designed to be higher than the case temperature set point Ts-T2, and accordingly, the continuous time tx1 is longer than the continuous time tx2, that is, the chamber door side temperature Td is maintained at a lower temperature for a longer time, which means that the chamber temperature can be stably maintained below the case temperature set point Ts, and at this time, the conventional refrigeration control can be restored without greatly supplementing the cooling capacity to the chamber through the door opening refrigeration control; or the side temperature Td of the compartment is maintained at a lower temperature for a longer time, which means that the temperature of the compartment is obviously reduced and relatively stable, and the compartment is not required to be greatly supplemented with cold by door opening refrigeration control at the moment, so that the conventional refrigeration control can be restored.
As shown in fig. 2, in some embodiments of the present invention, the refrigeration system employs a cascade refrigeration system having a high-temperature-stage compressor 21 and a low-temperature-stage compressor 22, the high-temperature-stage compressor 21 being in a high-temperature-stage refrigeration cycle including the high-temperature-stage compressor 21, a condensation prevention pipe 23, a condenser 24, a first filter 25, a first capillary tube 26, an evaporation condenser 27, and a gas-liquid separator 28 connected in sequence, and the low-temperature-stage refrigeration cycle including the low-temperature-stage compressor 22, an oil separator 29, the evaporation condenser 27, a second filter 30, a second capillary tube 31, and an evaporator 32 connected in sequence, with an oil return line 33 connected between the oil separator 29 and the low-temperature-stage compressor 22. For an cascade refrigeration system, the first frequency up strategy includes: simultaneously increasing the operating frequencies of the high temperature stage compressor 21 and the low temperature stage compressor 22; the second up-conversion strategy includes: the operating frequencies of the high-temperature-stage compressor 21 and the low-temperature-stage compressor 22 are sequentially increased; the frequency-reducing strategy comprises the following steps: the operating frequencies of the high temperature stage compressor 21 and the low temperature stage compressor 22 are successively reduced.
Since the characteristics of the cascade refrigeration system are that the high temperature stage refrigeration cycle cools the condensing side of the low temperature stage refrigeration cycle. Therefore, the high-temperature-stage refrigeration cycle must be operated first, and the low-temperature-stage refrigeration cycle must be started after the temperature of the condensation side of the low-temperature-stage refrigeration cycle is lowered. Therefore, in the operation stage, the temperature of the condensation side of the low-temperature-stage refrigeration cycle is already reached, and the high-temperature compressor and the low-temperature compressor are simultaneously operated; in the shutdown phase, the high-temperature-stage compressor 21 needs to be started first, and the low-temperature-stage compressor 22 is started again after the temperature of the condensing side of the low-temperature-stage compressor 22 is reduced.
In some application examples, the high-temperature-stage compressor 21 and the low-temperature-stage compressor 22 in the first frequency-raising strategy are gradually raised to full frequency at the same frequency-raising speed, and the same frequency-raising speed can improve the reliability of the refrigeration system, where "full frequency" refers to the maximum operation frequency corresponding to the high-temperature-stage compressor 21/the low-temperature-stage compressor 22. The high-temperature-stage compressor 21 in the second frequency-raising strategy is started first and gradually raised to full frequency, and after the high-temperature-stage compressor 21 is started to reach the preset running time t, the low-temperature-stage compressor 22 is started again and gradually raised to full frequency, and the frequency raising speed of the high-temperature-stage compressor 21 is greater than the frequency raising speed of the low-temperature-stage compressor 22, so that the cascade refrigeration system is started quickly for cooling. The high-temperature-level compressor 21 and the low-temperature-level compressor 22 in the frequency-reducing strategy reduce the operating frequency at the same frequency-reducing speed, wait for the set waiting time after each frequency reduction, and return to the step of judging whether the back side temperature Tb of the compartment is less than or equal to the set box temperature value Ts-T at the set interval time again.
On the basis of the second frequency raising strategy, in order to make the response speed of the cascade refrigeration system faster, the preset operation time t is determined according to the compartment backside temperature Tb detected before the high-temperature stage compressor 21 is started, and the preset operation time t corresponding to the compartment backside temperature Tb is obtained from a pre-established temperature-time comparison relationship, where the temperature-time comparison relationship is shown in the following table.
| Back side temperature Tb of chamber | Tb＞-40℃ | -60℃＜Tb≤-40℃ | Tb≤-60℃ |
| Presetting the operation timeInterval t(s) | 600～800 | 500～600 | 300～500 |
According to the above table, the lower the compartment backside temperature Tb, the shorter the corresponding preset operation time t, which is designed because the less cold is required for the compartment temperature to drop to the compartment temperature set point Ts when the compartment backside temperature Tb is low, the shorter the preset operation time t of the high-temperature stage compressor, whereas the more cold is required for the compartment temperature to drop to the compartment temperature set point Ts when the compartment backside temperature Tb is high, the longer the preset operation time t of the high-temperature stage compressor 21.
As shown in fig. 3, for easy understanding, the following describes the flow of the compressor control method with an application example of the present invention:
step S1, a refrigerating system stably operates and steps into a start-stop stage;
step S2, after a door opening signal of a door is detected, the refrigerating system enters door opening refrigeration control to acquire the working state of the refrigerating system, when the refrigerating system is in an operation stage, the step S3 is executed, and when the refrigerating system is in a shutdown stage, the step S4 is executed;
step S3, judging whether the duration of the door opening is more than or equal to a first preset time tk1, if not, executing a step S4 after detecting a door closing signal of a door, and if so, executing a step S5;
step S4, judging whether at least one compartment door side temperature Td of the compartment is more than or equal to a compartment temperature set value Ts+Tg1, if yes, executing step S5, and if not, executing step S13;
step S5, the high-temperature-level compressor and the low-temperature-level compressor are increased to full frequency, and step S9 is executed;
step S6, judging whether the duration of the door opening is more than or equal to a second preset time tk2, if not, executing a step S7 after detecting a door closing signal of the door, and if so, executing a step S8;
step S7, judging whether at least one compartment door side temperature Td of the compartment is more than or equal to a compartment temperature set value Ts+Tg2, if yes, executing step S8, and if not, executing step S13;
step S8, starting the high-temperature-stage compressor and gradually raising the frequency to the full frequency, starting the low-temperature-stage compressor and gradually raising the frequency to the full frequency after the starting time reaches the preset running time t, and executing the step S9;
step S9, judging whether the back side temperature Tb of the compartment is less than or equal to the set box temperature value Ts-T at intervals, if so, executing step S10, and if not, executing step S11;
step S10, the operation frequencies of the high-temperature-level compressor and the low-temperature-level compressor are gradually reduced, and the step S9 is returned;
step S11, maintaining the current operating frequency, and executing step S12;
step S12, judging whether the chamber door side temperature Td is less than or equal to the case temperature set value Ts-T1 and maintains the continuous time tx1 or the chamber door side temperature Td is less than or equal to the case temperature set value Ts-T2 and maintains the continuous time tx2, if not, returning to the step S9, and if yes, executing the step S13;
and S13, exiting the door opening refrigeration control.
It should be understood that the preset adjustment amounts of Tg1, tg2, T1, T2 and the like in the foregoing may take values according to specific design requirements, and specific numerical values are exemplified by a first preset time tk1=3 min, a second preset time tk2=3 min, a third preset time of 1min, an up-rate of the first up-rate strategy of 5Hz/min, a start-up frequency of the high-temperature compressor of the second up-rate strategy of 43Hz, an up-rate of 10Hz/min, a start-up frequency of the low-temperature compressor of the second up-rate strategy of 43Hz, an up-rate of 5Hz/min, a down-rate of the down-rate strategy of 3Hz/1min, a set waiting time of 30s, a set interval time of 20s, a continuous time tx1 of 60min, and a continuous time tx2 of 10min. The preset values are set according to the characteristics of the samples in the storage box and the energy-saving requirement of the storage box, and the invention is not particularly limited.
As shown in fig. 1 and 2, the present invention further provides a storage box 1, and the controller of the storage box executes the above-mentioned compressor control method to adjust the operation frequency of the compressor, so as to effectively reduce the influence of temperature rise caused by door opening and closing actions on samples outside the compartment, obviously improve the temperature uniformity in the storage box, and control logic of door opening and refrigeration control is described in detail above, and only the operation process of the storage box is briefly described below.
After the storage box 1 is electrified and rapidly warmed, the refrigerating system starts to stably operate, namely, the refrigerating system steps into a start-stop stage, and at the moment, the actual box temperature value Tx is smaller than the box temperature set value Ts, preferably, tx-Ts is smaller than 3 ℃, and the actual box temperature value Tx is the back side temperature Tb of the compartment; after detecting the door opening signal of the door 11, the refrigerating system of the storage box 1 enters door opening refrigeration control, and the working state of the refrigerating system is obtained.
When the door opening signal is detected in the operation stage, after the first preset time tk1, the door closing signal is not received yet, the high-low temperature compressor is increased to full frequency to maintain operation, if the door closing signal is received in a short time, the operation frequency of the compressor is judged according to the door side temperature Td detected by the door side temperature sensing bag arranged at the small door of the compartment and the box temperature set value Ts, the door is closed, the door is kept for a third preset time, if the door side temperature Td detected by the door side temperature sensing bag is higher than the box temperature set value Ts by a certain value, the high-low temperature compressor is increased to full frequency to maintain operation, otherwise, the door opening control mode is exited.
When the door opening signal is detected in the shutdown stage, after the second preset time tk2, the door closing signal is not received yet, the high-temperature-stage compressor is increased to the full-frequency maintaining operation, after the operation preset operation time t is started, the low-temperature-stage compressor is increased to the full-frequency maintaining operation, if the door closing signal is received in a short time, the operation frequency of the compressor is judged according to the door side temperature Td detected by the door side temperature sensing bag arranged at the small door of the compartment and the box temperature set value Ts, after the door is closed, the high-temperature-stage compressor is kept for a third preset time, if the door side temperature Td detected by the door side temperature sensing bag is higher than the box temperature set value Ts by a certain value, the high-temperature-stage compressor is increased to the full-frequency maintaining operation, after the operation preset operation time t is started, the low-temperature-stage compressor is started and increased to the full-frequency maintaining operation, and otherwise, the door opening control mode is exited.
Since the temperature inside the compartment is less affected by the door opening operation, the full-frequency operation of the compressor inevitably results in a further decrease in the temperature inside the compartment in order to decrease the temperature outside the compartment, so that when the back side temperature Tb of the compartment is lower than a certain set value, the compressor is successively cooled until the back bulb temperature is not lower than this value, and this frequency operation is maintained at this time. And when the temperature Td of the door side of the compartment is lower than the set value Ts of the box temperature by a certain value and is maintained for a period of time, the door opening control mode is exited.
In some embodiments, the preservation box 1 is provided with more than two compartments 12 from top to bottom, the back side temperature sensing bulb 15 is arranged inside one compartment located in the middle position, and a plurality of groups of freezing shelves 16 and freezing boxes 17 are placed in each compartment 12 for sample preservation. The bottom of the preservation box 1 is a machine chamber 18, a high-temperature-level compressor 21, a low-temperature-level compressor 22, a frequency converter, a first filter 25, a second filter 30, a gas-liquid separator 28, a condenser 24, a fan, a first capillary tube 26, a second capillary tube 31 and an oil separator 29 are mainly arranged in the machine chamber 18, and an evaporator 32 is sequentially foamed at the back, the side and the top of the preservation box 1.
The invention also proposes a storage medium for storing a computer program which, when run, performs the compressor control method described above.
It is noted that the above-mentioned terms are used merely to describe specific embodiments, and are not intended to limit exemplary embodiments according to the present invention. When the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or groups thereof. The order of execution of the operations, steps, and the like in the apparatuses and methods shown in the specification and the drawings may be any order as long as the order is not particularly limited, and the output of the preceding process is not used in the following process. The use of ordinal-like terms for descriptive convenience does not necessarily imply that they are necessarily implemented in such order.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (16)
1. A method for controlling a compressor of a storage tank, comprising:
after detecting a door opening signal of a door, the refrigerating system of the preservation box enters door opening refrigeration control;
acquiring the working state of the refrigeration system, and adjusting the operation frequency of a compressor of the refrigeration system according to the working state, the continuous door opening time and the compartment door side temperature Td so as to supplement cold energy to a compartment of the preservation box;
the duration door opening time is the duration time of the door opening signal, and the chamber door side temperature Td is the temperature of the chamber close to the door.
2. The compressor control method of claim 1, wherein adjusting the compressor operating frequency of the refrigeration system according to the operating state, the duration door opening time, and the compartment door side temperature Td comprises:
when the refrigerating system is in an operation stage, judging whether a cooling and adding condition is reached, wherein the cooling and adding condition is that the continuous door opening time is more than or equal to a first preset time tk1 or the continuous door opening time is less than or equal to the first preset time tk1, at least one compartment door side temperature Td of the compartment is more than or equal to a compartment temperature set value Ts+Tg1, and if yes, executing a first frequency raising strategy;
and/or when the refrigerating system is in a shutdown stage, judging whether a cooling starting condition is reached, wherein the cooling starting condition is that the continuous door opening time is more than or equal to a second preset time tk2 or the continuous door opening time is less than or equal to the second preset time tk2, at least one compartment door side temperature Td of the compartment is more than or equal to a compartment temperature set value Ts+Tg2, and if yes, executing a second frequency raising strategy;
wherein, tg1 and Tg2 are both preset adjustment amounts.
3. The compressor control method according to claim 2, wherein the chamber door side temperature Td is detected when a third preset time is reached by standing after receiving a door closing signal of the door; or the chamber door side temperature Td is detected when the fluctuation range of the chamber door side temperature Td is within a set threshold value and is maintained for a fourth preset time after receiving the door closing signal of the door.
4. The compressor control method according to claim 2, characterized in that the compressor control method further comprises:
after executing the first frequency up-conversion strategy and/or the second frequency up-conversion strategy;
judging whether the back side temperature Tb of the compartment is less than or equal to the set box temperature value Ts-T at intervals of set intervals;
if yes, executing a frequency-reducing strategy;
if not, maintaining the current operating frequency;
wherein the back side temperature Tb of the compartment is the temperature of one compartment far away from the compartment door, and T is a preset adjustment amount.
5. The compressor control method of claim 4, further comprising: when the current running frequency is judged to be maintained, judging whether a conventional refrigeration condition is reached, wherein the conventional refrigeration condition is that the temperature Td of the side of the compartment door is less than or equal to a set value Ts-T1 of the compartment temperature and is maintained for a continuous time tx1, or the temperature Td of the side of the compartment door is less than or equal to a set value Ts-T2 of the compartment temperature and is maintained for a continuous time tx2, and if yes, the refrigeration system exits from door opening refrigeration control;
wherein, T1 and T2 are both preset adjustment amounts.
6. The compressor control method of claim 4, wherein the refrigeration system is an cascade refrigeration system having a high temperature stage compressor and a low temperature stage compressor;
the first frequency up strategy includes: simultaneously increasing the operating frequencies of the high-temperature-stage compressor and the low-temperature-stage compressor;
the second frequency up strategy includes: the operation frequency of the high-temperature-stage compressor and the low-temperature-stage compressor is sequentially increased;
the frequency-reducing strategy comprises the following steps: the operating frequencies of the high temperature stage compressor and the low temperature stage compressor are successively reduced.
7. The compressor control method of claim 6, wherein the high temperature stage compressor and the low temperature stage compressor in the first frequency boost strategy are gradually boosted to full frequency at the same frequency boost speed.
8. The method of claim 6, wherein the high-temperature-stage compressor in the second frequency-increasing strategy is started first and gradually increases to a full frequency, and the low-temperature-stage compressor is started and gradually increases to the full frequency after the high-temperature-stage compressor is started for a preset operation time t; the frequency raising speed of the high-temperature-stage compressor is higher than that of the low-temperature-stage compressor.
9. The compressor control method according to claim 8, wherein the preset operation time t is determined according to a compartment backside temperature Tb detected before the high-temperature-stage compressor is turned on, and the preset operation time t corresponding to the compartment backside temperature Tb is obtained from a pre-established temperature-time comparison relationship; wherein, the lower the chamber backside temperature Tb, the shorter the corresponding preset running time t.
10. The compressor control method according to claim 6, wherein the high temperature stage compressor and the low temperature stage compressor in the frequency reducing strategy reduce the operating frequency at the same frequency reducing speed, wait for the set waiting time after each frequency reducing, and re-judge whether the back side temperature Tb of the compartment is less than or equal to the case temperature set value Ts-T.
11. The compressor control method according to any one of claims 1 to 10, characterized in that the compressor control method further comprises:
when the refrigerating system is in the operation stage, judging whether the cooling and adding quantity condition is reached, and if not, exiting the door opening refrigeration control;
and/or when the refrigerating system is in a stop stage, judging whether a cooling starting condition is reached, and if not, exiting the door opening refrigeration control.
12. A preservation box, comprising: a cabinet having at least one compartment, a cabinet door connected to the cabinet, a door sensor for detecting a state of opening and closing of the cabinet door, and a refrigerating system for cooling the compartment, wherein a controller of the holding cabinet performs the compressor control method of any one of claims 1 to 11.
13. The holding compartment of claim 12 wherein a compartment door is provided on a side of the compartment adjacent the door, each compartment having a door side temperature sensing bulb disposed adjacent the compartment door and at least one compartment having a back side temperature sensing bulb disposed away from the compartment door.
14. The holding tank of claim 13 wherein said holding tank has more than two compartments from top to bottom and said backside temperature sensing bulb is disposed within one compartment at an intermediate location.
15. The holding tank of claim 12 wherein the refrigeration system is a cascade refrigeration system having a high temperature stage compressor and a low temperature stage compressor.
16. A storage medium for storing a computer program, characterized in that the computer program when run performs the compressor control method of any one of claims 1 to 11.
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| CN117433242A (en) * | 2023-12-08 | 2024-01-23 | 珠海格力电器股份有限公司 | Control method and device for refrigeration equipment, electronic equipment and storage medium |
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