CN110953798A - Instant freezing chamber control method and refrigerator - Google Patents

Instant freezing chamber control method and refrigerator Download PDF

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Publication number
CN110953798A
CN110953798A CN201911046632.0A CN201911046632A CN110953798A CN 110953798 A CN110953798 A CN 110953798A CN 201911046632 A CN201911046632 A CN 201911046632A CN 110953798 A CN110953798 A CN 110953798A
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CN
China
Prior art keywords
cooling
temperature
freezing chamber
stage
instant freezing
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Pending
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CN201911046632.0A
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Chinese (zh)
Inventor
钱梅双
辛海亚
梁起
胡卓鸣
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Gree Electric Appliances Inc of Zhuhai
Hefei Jing Hong Electrical Co Ltd
Original Assignee
Gree Electric Appliances Inc of Zhuhai
Hefei Jing Hong Electrical Co Ltd
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Application filed by Gree Electric Appliances Inc of Zhuhai, Hefei Jing Hong Electrical Co Ltd filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN201911046632.0A priority Critical patent/CN110953798A/en
Publication of CN110953798A publication Critical patent/CN110953798A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
    • 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
    • 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
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/30—Quick freezing
    • 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
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/36—Visual displays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2600/00—Control issues
    • F25D2600/02—Timing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2600/00—Control issues
    • F25D2600/06—Controlling according to a predetermined profile

Abstract

The invention relates to a control method of an instant freezing chamber and a refrigerator. The instant freezing chamber control method comprises a multi-stage supercooling and cooling process, a supercooling removing process and a conventional refrigeration and preservation process. The multi-stage supercooling and cooling process carries out staged cooling on the cooled object, and each cooling stage carries out cooling control on the cooled object, so that the cooled object can smoothly enter a supercooling state. Each temperature reduction stage controls the instant freezing chamber for storing the cooled object to run for Tn time according to the preset temperature Tn, so that the temperature distribution of the instant freezing chamber is more uniform in the process of a single temperature reduction stage. In the supercooling relieving process, the flow of a capillary tube group in the refrigerating system is reduced, the rotating speed of a condensing fan is increased, the cooling capacity of the cooled object in the supercooling state is increased, the supercooling state of the cooled object with larger volume is fully relieved, and the cooled object is instantly frozen. The frozen cooled object is stored for a long time at a normal refrigerated storage temperature.

Description

Instant freezing chamber control method and refrigerator
Technical Field
The invention relates to a control method of an instant freezing chamber and a refrigerating system, in particular to a control method capable of realizing instant freezing of food and a refrigerator.
Background
In order to better maintain the nutrition of frozen food, the food is preserved by adopting the freezing modes of ordinary freezing, quick freezing and the like, but the traditional ordinary freezing has the defects of uneven temperature control in a freezing chamber, long-time stay in the maximum ice crystal generation zone and the like; although the rapid freezing can rapidly pass through the maximum ice crystal generation zone, the production cost is high, and the rapid freezing is not beneficial to popularization and application in refrigerators. The supercooling freezing technology can ensure that the preserved object forms uniform and fine ice crystals after the supercooling process, can better keep the flavor of food compared with the common freezing method, and is more favorable for cutting.
The existing technology for supercooling preservation has the following disadvantages:
(1) the supercooling is released in advance due to uneven temperature reduction in the supercooling process.
(2) The supercooling relieving effect is not good, and the wind speed or the wind volume is increased.
(3) The supercooling depth is shallow, and the state of supercooling cannot be well entered.
Disclosure of Invention
In view of the above, the present invention provides a method for controlling an instant freezing chamber and a refrigeration system.
The invention relates to a control method of an instant freezing chamber and a refrigerator. The instant freezing chamber control method comprises a multi-stage supercooling and cooling process, a supercooling removing process and a conventional refrigeration and preservation process. The multi-stage supercooling and cooling process carries out staged cooling on the cooled object, and each cooling stage carries out cooling control on the cooled object, so that the cooled object can smoothly enter a supercooling state. Each temperature reduction stage controls the instant freezing chamber for storing the cooled object to run for Tn time according to the preset temperature Tn, so that the temperature distribution of the instant freezing chamber is more uniform in the process of a single temperature reduction stage. In the supercooling relieving process, the flow of a capillary tube group in the refrigerating system is reduced, the rotating speed of a condensing fan is increased, the cooling capacity of the cooled object in the supercooling state is increased, the supercooling state of the cooled object with larger volume is fully relieved, and the cooled object is instantly frozen. The frozen cooled object is stored for a long time at a normal refrigerated storage temperature.
Specifically, the method comprises the following steps:
the invention provides a refrigerator:
the instant freezing chamber is provided with a cooling device for providing cold energy for the instant freezing chamber and a control system for controlling the cooling device to carry out instant freezing preservation on the instant freezing chamber;
the object to be cooled is subjected to instant freezing control in an instant freezing chamber, and the temperature of the object to be cooled is controlled by controlling the cooling of the instant freezing chamber;
the cooling device comprises a compressor, an evaporator, a condenser and a capillary tube group; the capillary group is formed by connecting at least two capillary pipelines with different rated flows in parallel, the capillary group is provided with a flow path control valve so that the flow of the capillary group can be adjusted, and the condenser is provided with a condenser fan;
the control system includes: the device comprises a controller, a temperature sensor, a flow path control valve, a timer and a condenser fan;
the instant freezing preservation comprises a multi-stage supercooling and cooling process, a supercooling relieving process and a conventional refrigeration preservation process;
the control system carries out staged cooling on the cooled object according to the preset operation target temperature and the preset operation duration of each multi-stage supercooling cooling process; in the final stage of the multi-stage supercooling and cooling process, after the preset stage cooling is completed in the preset time period, the flow control valve is controlled to reduce the flow of the capillary group, the rotating speed of the condenser fan is controlled to increase, and the reduced flow of the capillary and the increased rotating speed of the condenser fan are kept for a time ta to remove supercooling.
The invention also provides a method for controlling the instant freezing chamber, which carries out instant freezing preservation on the instant freezing chamber by controlling a cooling device, and is characterized in that:
the object to be cooled is subjected to instant freezing preservation in an instant freezing chamber, and the temperature of the object to be cooled is controlled by controlling the cooling of the instant freezing chamber;
the instant freezing preservation process with a multi-stage supercooling and cooling process, a supercooling relieving process and a conventional refrigeration preservation process is carried out on the cooled object in the instant freezing chamber through a cooling device;
the multi-stage supercooling and cooling process comprises n cooling stages, wherein each cooling stage of the n cooling stages is provided with a preset operation target temperature and a preset operation duration; the multi-stage supercooling and cooling process carries out staged cooling on the cooled object according to a preset running target temperature and a preset running time;
in the final stage of the multi-stage supercooling and cooling process, after the preset stage cooling is completed within a preset time period, the flow of the capillary group is reduced to a second flow V2 from a first flow V1 by controlling the flow control valve, the rotating speed of the fan of the condenser is increased by the control device, the rotating speed of the fan of the condenser is increased to a second rotating speed S2 of the fan from a first rotating speed S1 of the fan, and S2 is the maximum rotating speed of the fan of the condenser;
the flow of the capillary tube group is reduced, the inner diameter of the capillary tube is reduced or the total length of the capillary tube is increased, so that the flow speed of the refrigerant passing through the capillary tube in unit time is reduced, the quality of the refrigerant entering the evaporator in unit time is reduced, when the suction pressure of the compressor is unchanged, the quality of the refrigerant is reduced, the evaporation pressure is reduced, the reduction of the evaporation pressure is equal to the reduction of the evaporation temperature, the surface temperature of the evaporator is reduced, the air temperature of a cavity of the evaporator is reduced, an air channel circulating system can be arranged in the refrigerator, and low-temperature cold air enters the instant freezing chamber through air channel circulation to achieve the purpose of quickly reducing the temperature.
The heat exchange between the refrigerant in the condenser and the outside air is accelerated by increasing the rotating speed of the fan of the condenser, so that the condensing pressure is reduced, the quality of the refrigerant entering the evaporator in unit time is reduced, when the suction pressure of the compressor is unchanged, the quality of the refrigerant is reduced, the evaporating pressure is reduced, the reduction of the evaporating pressure is equal to the reduction of the evaporating temperature, the reduction of the surface temperature of the evaporator can be realized, the air temperature of a cavity of the evaporator is reduced, an air channel circulating system can be arranged in the refrigerator, and the low-temperature cold air enters the instant freezing chamber through air channel circulation, so that the purpose of quickly reducing the temperature is achieved.
When two measures of increasing the rotating speed of a fan of the condenser and reducing the flow of the capillary group are superposed: the rotating speed of the fan of the condenser is increased, the condensing pressure can be reduced, the evaporating temperature is lowered, and if the flow of the capillary tube group is synchronously reduced within a certain range, the extreme value of the evaporating temperature reduction of the refrigerating system can be achieved, and the purpose of supplying the maximum refrigerating capacity to the instant freezing chamber is realized.
The flow of the capillary group keeps the second flow V2 and the condenser fan keeps the second rotating speed S2 of the fan to jointly operate for the preset ta time, the maximum cooling capacity is provided for the instant freezing chamber, and supercooling is removed.
Preferably, the value range of the preset operation ta time is 0h < ta ≦ 10 h.
Preferably, after the multi-stage supercooling and cooling process is finished, the timer transmits a signal of finishing the supercooling and staged cooling process to the controller; the controller sends an instruction for reducing the flow of the capillary group to the capillary flow path control valve, and simultaneously sends an instruction for increasing the rotating speed of the condenser fan to the rotating speed adjusting device of the condenser fan; when the conditions of the capillary group flow rate reduction to the preset second flow rate V2 and the condenser fan rotation speed increase to the preset fan second rotation speed S2 are simultaneously met, the timer starts timing to operate the capillary group at the second flow rate V2 and the condenser fan at the fan second rotation speed S2 together for a time ta.
Preferably, in the 1 st stage of the multi-stage supercooling cooling process, the compressor rotating speed is operated at the maximum rotating speed second rotating speed M2; after the temperature reduction in the 1 st stage of the multi-stage supercooling temperature reduction process is finished, the rotating speed of the compressor is operated at a first rotating speed M1 which is lower than a second rotating speed M2 of the compressor.
Preferably, the n cooling stages are at least at the last cooling stage, and after reaching the cooling target, the n cooling stages are stabilized at the preset target temperature for a period of time until the preset time of the cooling process is finished.
Preferably, n cooling stages exist in the cooling process, and the n cooling stages are divided into1, … … i and … …, wherein the ith cooling stage represents any one of n cooling stages, i is more than or equal to 1 and less than or equal to n, n is a natural number and more than or equal to 2, and the start and stop of the air supply device are controlled according to the preset temperature of the cooling stages, namely T is usedONi＝Ti+TB1The temperature T is used as the starting temperature point of the air supply device in the ith stageoffi＝TONi-TB2[ ii ] 2 as the shutdown temperature point of the blower in the i-th stage, TB1Indicates the floating temperature T of the starting point of the instantaneous freezing chamber in the starting process of the compressorB2Temperature difference between instant freezing chamber start and stop, TONi>Ti>Toffi；
In the i-th stage:
when the storage temperature of the instant freezing chamber reaches TONi＝Ti+TB1When the pressure exceeds 2, the air supply device is controlled to work;
when the storage temperature of the instant freezing chamber reaches Toffi＝TONi-TB2And when the pressure exceeds 2, controlling the air supply device not to work.
Preferably, the air supply device is a cold air supply door for performing cold supply control of the instant freezing chamber.
Preferably, the value range of the time ti for cooling control on the cooled object in the ith stage in the multi-stage supercooling and cooling process is 0h < ti ≦ 8 h.
Preferably, the preset target temperature of the multi-stage supercooling cooling process satisfies: t1 is more than or equal to 0 ℃ at the temperature of 5 ℃; tn is more than or equal to-15 ℃, T2 is more than or equal to 0 ℃, i is more than or equal to 2 and less than or equal to n.
Preferably, the conventional refrigeration storage process is carried out such that the cooled material is operated at a predetermined temperature Tc of-7 ℃ Tc <0 ℃.
Preferably, the control method for the conventional preservation process to operate according to the preset temperature Tc comprises the following steps: when the temperature of the instant freezing chamber (12) reaches the starting temperature point TONc, opening an air door of the instant freezing chamber (12); when the temperature of the instant freezing chamber reaches a first shutdown temperature point TOFFc, closing the air door of the instant freezing chamber; t isONc＝Tc+TB1/2，TOFFc＝TONc–TB2/2；TB1Indicating the floating temperature of a starting point of an instant freezing chamber in the starting process of the compressor; t isB2Mean the instant freezing chamber temperatureAnd (4) poor.
Preferably, TB1The value range of (A) is 0 DEG C<TB1≤2℃，TB2The value range of (A) is 0 DEG C<TB2≤2℃。
Preferably, in the multi-stage supercooling and cooling process, the flow rates of the capillary tube groups are kept constant and are all the first flow rate V1, and the rotation speeds of the condenser fan are all the first rotation speed S1 of the fan.
Preferably, the flow rates of the capillary group in the conventional preservation process are both the first flow rate V1, and the fan rotation speed of the condenser is both the first fan rotation speed S1.
The invention also provides a refrigerator which is provided with the control system for realizing the instant freezing chamber control method. The refrigerator comprises an instant freezing chamber, and the instant freezing chamber adopts the instant freezing chamber control method to carry out instant freezing storage on the cooled object.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely exemplary embodiments of the present disclosure, and other drawings may be derived by those skilled in the art without inventive effort.
FIG. 1 is a control logic diagram of an embodiment of the present invention;
FIG. 2 is a diagram of a refrigeration system according to an embodiment of the present invention;
FIG. 3 is a refrigerant flow diagram according to an embodiment of the present invention;
FIG. 4 is a structural view of a refrigerator according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a freezing curve of water at normal freezing in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of the freezing curve of water in an embodiment of the present invention in the presence of a supercooling freezing process;
FIG. 7 is a schematic diagram of a refrigerator control system according to an embodiment of the present invention;
FIG. 8 is a graph of temperature versus time for a food product stored in a flash chamber throughout a sub-cooling process in accordance with an embodiment of the present invention;
in the figure:
refrigerator-10; a refrigerating chamber-11; instant freezing chamber-12; freezing chamber-13;
a refrigeration system-20; a refrigeration evaporator-21; a muffler assembly-220; a return gas heat exchange section-221; a compressor-23; condenser-24; anti-condensation pipe-25; a drier-filter-26; capillaries 1-271; capillary 2-272; an electric switching valve 28;
control system-30; a controller-31; a display-32; a temperature sensor-33; a temperature regulating device-34; a frequency conversion plate-35; a timer-36; a condenser fan-37;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
The instant freezing technique is briefly described below with reference to fig. 5 and 6.
The supercooled state refers to a liquid having a temperature lower than the freezing point but not solidified or crystallized, and is called a supercooled liquid. There is a great demand for long-term preservation of foods such as fresh meat, fruits and vegetables in daily life. The fresh meat, fruits and vegetables and other foods contain a large amount of water, and the ice crystals are large in size and usually form needle-shaped ice crystals during ordinary freezing, so that cells can be damaged, a large amount of juice flows out during thawing, large ice crystals can extrude the tissue structure of the foods, the foods lose delicate flavor substances, and the user experience is poor.
The condition of the food entering the overcooling state mainly influences whether the food can well enter the overcooling state or not according to the temperature reduction speed, the air temperature distribution around the sample and the difference value of the surface temperature and the central temperature of the food. Fig. 5 shows a schematic diagram of a normal freezing and freezing curve of water, namely a freezing and freezing curve without supercooling, and fig. 6 shows a schematic diagram of a freezing curve of water with supercooling freezing process. Analysis shows that the ordinary freezing process of water in fig. 5 is that the water slowly begins to freeze from the surface of the water with the increase of time. In contrast, fig. 6 shows the supercooling freezing process of water, in the initial stage of the freezing process, even if the freezing point of water is exceeded, the water does not start to freeze but continues to remain in a liquid state, and when the temperature drops to the nucleation point or a certain stimulus is externally applied, the water in the supercooled state instantaneously starts to freeze on the surface and inside.
The principle of the supercooling freezing technology is that ice nuclei in water are uniformly distributed and are in a large number when the ice nuclei begin to freeze after being in a supercooling state, most of ice crystals formed after freezing are in an elliptic granular shape, and the ice crystals have small volume and uniform size and are different from needle-shaped ice crystals which are generated by common freezing and are easy to damage cells. The food in the supercooled state can better keep the delicate flavor of the food, reduce the damage of ice crystals to food cells, reduce the outflow of the contents of the food cells after unfreezing and improve the user experience.
The basic inventive idea is as follows:
the invention provides a method for controlling an instant freezing chamber and a refrigerator, which ensure that a cooled object in the instant freezing chamber 12 enters a supercooled state through multistage cooling in a multistage supercooling cooling process. During the supercooling relieving process, the flow of the capillary group is regulated through the capillary group flow path control valve, the flow of the capillary group is reduced, the rotating speed of a fan of the condenser is increased, and the purpose of increasing the supply of cold energy is achieved, so that the supercooled state of the cooled object in the instant freezing chamber is relieved, the instant freezing is realized, and uniform and fine ice crystals are formed. And finally, the temperature of the instant freezing chamber 12 is controlled to be within the range of the conventional refrigeration preservation temperature, so that the cooled object is preserved for a long time.
The following detailed description of the embodiments of the present invention will be made with reference to fig. 1 to 4, and fig. 7 and 8:
the embodiment shown in fig. 2 provides a refrigeration system that performs any of the control methods of the present invention. The system comprises but is not limited to the following components: the refrigeration evaporator 21, the air return pipe assembly 220, the air return heat exchange section 221, the compressor 23, the condenser 24, the condensation preventing pipe 25, the drying filter 26, the capillaries 1-271, the capillaries 2-272 and the electric switching valve 28.
As shown in fig. 3, the refrigerant flow direction when the refrigeration system is in operation is: compressor → condenser → anti-condensation tube → dry filter → electric switch valve → capillary tube 1 or capillary tube 2 → refrigeration evaporator → return air tube component → compressor.
As shown in fig. 7, the present embodiment further provides a control system, including: the instant freezing chamber control system comprises a controller 31, a display 32, a temperature sensor 33, a temperature adjusting device 34, a frequency conversion plate 35, a timer 36 and a condenser fan 37, wherein the controller 31 is in control connection with the display 32, the temperature sensor 33, the temperature adjusting device 34, the frequency conversion plate 35, the timer 36 and the condenser fan 37, and the control system is used for realizing the instant freezing chamber control method provided by the invention.
Further, the electric switch valve 28 in the control system can realize the flow control of the capillary group, which is one of the flow path control valves. The electric switching valve is only used as an example of implementing the flow path switching of the capillary group to control the flow rate of the capillary in the present embodiment, and it should be understood that a flow path control valve capable of realizing the flow rate variation of the capillary group is within the protection scope of the present invention.
Further, the controller 31 in the control system sends a compressor rotation speed adjusting instruction to the frequency conversion plate 35, and the frequency conversion plate 35 adjusts the rotation speed of the compressor 23. The inverter board in this embodiment is only one example of a compressor speed adjusting device, and should not be understood as the only means for adjusting the compressor speed by using the inverter board.
Further, the temperature adjusting device 34 adjusts the temperature of the instant freezing chamber by using a cold air supply door of the instant freezing chamber.
Further, the user may select the instant freezing function through the display 32, and the control system performs the instant freezing chamber control method when the user selects the instant freezing function.
The embodiment also provides a refrigerator which is provided with the control system for realizing the instant freezing chamber control method. The refrigerator comprises an instant freezing chamber, and the instant freezing chamber adopts the instant freezing chamber control method to carry out instant freezing storage on the cooled object. The cooled material can be food, especially fresh meat food.
As shown in fig. 4, the refrigeration system executing any control method of the present invention may be a refrigerator including a refrigerating chamber 11, an instant freezing chamber 12, and a freezing chamber 13, and the refrigerator according to the present embodiment has a control system therein, which enables the refrigerator to perform an instant freezing control process on food placed in the instant freezing chamber 12.
The instant freezing chamber can realize various low-temperature storage processes of food, such as a supercooling non-freezing storage process, a supercooling freezing removal storage process, a low-temperature refrigeration function, a freezing process and the like. The user can select the storage process according to the self needs, and the instant freezing chamber can only realize the instant freezing storage process shown in the embodiment.
The instant freezing chamber control method according to the present embodiment will be described below.
As shown in fig. 1, a method for controlling an instant freezer includes the steps of:
s01: a multi-stage cooling and supercooling process:
n cooling stages are arranged in the multi-stage cooling process and are divided into 1 st stage, … … i stage and … … th stage, wherein the ith cooling stage represents any one stage of the n cooling stages, i is more than or equal to 1 and less than or equal to n, n is a natural number and is more than or equal to 2, and all the following limits on any one stage are replaced by the ith stage.
1, cooling stage: and controlling the instant freezing chamber to operate at a preset temperature T1 for T1 time by the control device, and controlling the compressor to rotate at a second rotating speed M2 during T1 time.
Further, the second compressor rotation speed M2 is the maximum compressor rotation speed.
The beneficial effects are that: when the food needs to be cooled, the rotating speed of the compressor is increased to increase the cooling capacity and improve the cooling rate of the instant freezing chamber, so that the food is more quickly stabilized near the temperature T1, and the early preparation time of the food in an overcooling state is shortened. The 1 st cooling stage controls the instantaneous freezing chamber to operate according to the preset temperature T1, so that the temperature of the instantaneous freezing chamber is kept in a small-range temperature interval containing the temperature T1, the overall temperature of the instantaneous freezing chamber is conveniently and uniformly reduced in the subsequent multi-stage supercooling cooling process, the temperature difference between the surface and the interior of the food placed in the instantaneous freezing chamber is smaller, and the food can smoothly enter a supercooling state in the subsequent multi-stage cooling process.
Furthermore, T1 is more than 0 ℃ at the temperature of 5 ℃ or more, and T1 is more than 0h at the temperature of 8h or more.
Further, before step S01, the method further includes the steps of: aS 01: the user selects the instant freeze function.
An i +1 th cooling stage: after the step of the 1 st temperature reduction stage is finished, the compressor is operated at a first rotating speed M1, and the rotating speed M2 of the compressor is more than M1; in the S01 multi-stage cooling and supercooling process, the condenser fan is always operated at the fan first rotating speed S1, and the capillary tube flow rate is kept at the first flow rate V1. The cooling method has the beneficial effects that the rotating speed of the compressor at the (i + 1) th cooling stage is recovered to M1, and the cooling capacity can be reduced by reducing the rotating speed of the compressor. When the cooled food enters the overcooling state, the slow cooling rate and the low cooling capacity are needed, so that the effect that the cooled food successfully enters the overcooling state and is not easily released from the overcooling state can be realized, and therefore, the effect can be realized by reducing the rotating speed of the compressor.
The multi-stage supercooling and cooling process comprises n cooling stages, wherein each cooling stage of the n cooling stages implements cooling control on food, temperature control is implemented on the food according to the preset temperature Ti of the cooling stages, and meanwhile the operation Ti time of the ith cooling stage is controlled.
Further, during the control process of air cooling on the food in the i stage, T is usedONi＝Ti+TB1The temperature T is used as the starting temperature point of the air supply device in the ith stageoffi＝TONi-TB2[ ii ] 2 as the shutdown temperature point of the blower in the i-th stage, TB1Indicates the floating temperature T of the starting point of the instant freezing chamber (2) in the starting process of the compressorB2Temperature difference between instant freezing chamber start and stop, TONi>Ti>Toffi。
In the i-th stage:
when the storage temperature of the instant freezing chamber reaches TONi＝Ti+TB1When the pressure exceeds 2, the air supply device is controlled to work;
when the storage temperature of the instant freezing chamber reaches Toffi＝TONi-TB2And when the pressure exceeds 2, controlling the air supply device not to work.
Furthermore, the value range of the time ti for cooling control on the cooled object in the ith stage in the multi-stage supercooling and cooling process is 0h < ti is less than or equal to 8 h. The beneficial effects are that: the control of the cooling time ti is implemented through the timer in a single cooling stage, so that the temperature difference between the surface and the inside of the food is favorably reduced for the single cooling stage, the success probability of the food entering the supercooling state is increased, and the condition that the food entering the supercooling state is easily released in advance can be avoided.
Further, TB1The value range of (A) is 0 DEG C<TB1≤2℃，TB2The value range of (A) is 0 DEG C<TB2≤2℃。
Further, the air supply device is controlled to control the cold air supply door.
Further, the cooling air door is provided with a baffle capable of realizing mechanical control.
Furthermore, the value range of the first rotating speed M1 of the compressor is that the rotating speed is more than or equal to 1200rpm and less than or equal to M1 and less than or equal to 1400rpm, and the value range of the second rotating speed M2 of the compressor is that the rotating speed is more than or equal to 3800rpm and less than or equal to M2 and less than or equal to 4500 rpm.
Furthermore, Tn is more than or equal to 15 ℃ and less than or equal to 0 ℃ in the (i + 1) th cooling stage in the multi-stage cooling and supercooling process, and T2 is more than or equal to 0 ℃ and i is more than or equal to 2 and less than or equal to n.
S02: supercooling release process: in the final stage of the multi-stage supercooling and cooling process, after the preset stage cooling is completed within the preset time period, the flow control valve is controlled to reduce the flow of the capillary group from the first flow V1 to the second flow V2, and the control device increases the rotating speed of the condenser fan from the first rotating speed S1 of the fan to the second rotating speed S2 of the fan;
the capillary group flow rate maintaining second flow rate V2 and the condenser fan maintaining fan second rotation speed S2 are operated together for a preset ta time to remove the overcooling.
Furthermore, the value range of S1 is 1200rpm < S1 < 1500rpm, and the value range of S2 is 1600rpm < S2 < 1900 rpm.
Further, the control method of the supercooling release process may be: after the multi-stage supercooling and cooling process is finished, the timer transmits a signal of finishing the supercooling and staged cooling process to the control device; the control device sends an instruction for reducing the flow of the capillary group to the capillary flow path control valve, and simultaneously sends an instruction for increasing the rotating speed of the condenser fan to the rotating speed adjusting device of the condenser fan; when the conditions of the capillary group flow rate reduction to the preset second flow rate V2 and the condenser fan rotation speed increase to the preset fan second rotation speed S2 are simultaneously met, the timer starts timing to operate the capillary group at the second flow rate V2 and the condenser fan at the fan second rotation speed S2 together for a time ta.
This has the advantage that the supercooled state is unstable, and that a certain stimulus is required to release the supercooled state, and this stimulus may be a temperature factor or a physical factor. The invention reduces the flow of the capillary group by adjusting the flow of the capillary group through the capillary group flow path control valve, and simultaneously reduces the temperature of cold air applied to food by increasing the rotating speed of the condenser fan to increase the cold supply amount of the instant freezing chamber in the supercooling release process, thereby quickly releasing the food from the supercooling state. The flow of the capillary group is changed to change the cooling capacity of the food, and the defect that the food is dehydrated and dried when the cooling capacity is increased by an air cooling method is avoided.
The cooling capacity can be increased by reducing the rotation speed of the condenser fan or reducing the flow rate of the capillary tube, but when the food volume in the instant freezing chamber is too large, the instant freezing chamber can release the overcooling state of the food by only a single means, so that the cooling is insufficient. When the cooling quantity is insufficient, namely the supercooling stimulation is insufficient, the ice crystals formed in the subsequent supercooling freezing process are uneven because the temperature difference between the surface of the food and the center of the food is too large when the food is supercooled. Therefore, the supercooling freezing is simultaneously removed by two means of reducing the flow of the capillary tube and increasing the rotating speed of the fan of the condenser, the effect of removing the supercooling process of large-volume food can be further improved, and the effect of forming uniformly distributed particles in the food is promoted.
After the food is released from the overcooling state, uniform, fine and smooth ice crystals can be quickly formed to achieve the effect of instant freezing, and the formed fine ice crystals have smaller damage to tissues, fibers or cells of the food, particularly meat products, compared with large needle-shaped ice crystals formed by common freezing. The loss of nutrient substances of the food after thawing can be better avoided, and the flavor of the food can be better maintained.
Furthermore, the capillary group consists of a capillary 1 and a capillary 2, the flow V2 of the capillary 2 is less than the flow V1 of the capillary 1, V1 is more than or equal to 4.5L/min and less than or equal to 5L/min, and V2 is more than or equal to 2L/min and less than or equal to 3L/min.
Furthermore, the value range of the time ta is 0h < ta ≦ 10 h.
S03: and (3) conventional refrigeration preservation process: and (3) restoring the rotating speed of the condenser fan to the rotating speed S1 of the step S01, operating the compressors at the first rotating speed M1, restoring the capillary flow to the first flow V1 by controlling the flow control valve of the capillary group, and controlling the instant freezing chamber to be in the normal refrigeration preservation temperature range according to the preset temperature Tc.
Further, the value range of the preset temperature Tc in the conventional refrigeration storage process is that Tc is more than or equal to minus 7 ℃ and less than 0 ℃.
Further, the method for controlling the instant freezing chamber within the conventional refrigeration preservation temperature range according to the preset temperature Tc by the conventional preservation phase chamber comprises the following steps: when the temperature of the instant freezing chamber reaches a first starting temperature point TONc, opening an air door of the instant freezing chamber; when the temperature of the instant freezing chamber reaches a first shutdown temperature point TOFFc, closing the air door of the instant freezing chamber; t isONc＝Tc+TB1/2,TOFFc＝TONc–TB2/2；TB1Indicating the floating temperature of a starting point of an instant freezing chamber in the starting process of the compressor; t isB2The temperature difference between the start and stop of the instant freezing chamber.
The method has the beneficial effect that the shelf life of the food in the supercooling process can be prolonged in the conventional refrigeration preservation. The opening and closing of the air door of the instant freezing chamber are controlled by judging the temperature of the instant freezing chamber, so that the functions of controlling the instant freezing chamber according to the preset temperature Tc and reducing energy consumption can be realized simultaneously, and the economic efficiency of the instant freezing chamber control method is improved.
As shown in fig. 8, fig. 8 is a graph of the temperature of the food stored in the instant freezing chamber as a function of time during the whole supercooling process according to the embodiment of the present invention. And (3) rapidly cooling the instant freezing chamber in the temperature range above zero degree in the S01A stage. The temperature of the food starts to be ready to enter the supercooled state at the low temperature region T1 slightly higher than zero. The stage S01B is a stage of supercooling, in which the temperature of the food is slowly reduced under the control of the cooling of the instant freezing chamber, the temperature of the food is lower than the freezing point of the food and is not frozen, and the food is successfully in a supercooled state. The supercooling release process of S02 in this embodiment increases the rotational speed of the condenser fan to increase the amount of cooling supplied to the flash chamber during the supercooling release process, thereby releasing the supercooled state from the temperature of the food. When the food is in the supercooling state, the food undergoes an instant freezing process, namely the temperature of the food is rapidly increased from the temperature lower than the freezing point in the supercooling state to the freezing point temperature, and the temperature of the food is maintained at the freezing point temperature for a period of time in the freezing process until the food is completely frozen. The instant freezing chamber is controlled at a preset temperature Tc during the regular refrigerated preservation at S03 such that the temperature of the food is lowered from the freezing point temperature to the Tc temperature, and the temperature of the food is maintained at substantially the Tc temperature during the subsequent regular refrigerated preservation.
Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (16)

1. A refrigerator characterized in that:
the instant freezing chamber is provided with a cooling device for providing cold energy for the instant freezing chamber and a control system for controlling the cooling device to carry out instant freezing preservation on the instant freezing chamber;
the object to be cooled is subjected to instant freezing control in an instant freezing chamber, and the temperature of the object to be cooled is controlled by controlling the cooling of the instant freezing chamber;
the cooling device comprises a compressor, an evaporator, a condenser and a capillary tube group; the capillary group is formed by connecting at least two capillary pipelines with different rated flows in parallel, the capillary group is provided with a flow path control valve so that the flow of the capillary group can be adjusted, and the condenser is provided with a condenser fan;
the control system includes: the device comprises a controller, a temperature sensor, a flow path control valve, a timer and a condenser fan;
the instant freezing preservation comprises a multi-stage supercooling and cooling process, a supercooling relieving process and a conventional refrigeration preservation process;
the control system carries out staged cooling on the cooled object according to the preset operation target temperature and the preset operation duration of each multi-stage supercooling cooling process; after the multi-stage supercooling cooling process is finished in the preset stage cooling within the preset time period, the flow control valve is controlled to reduce the flow of the capillary group, the rotating speed of the condenser fan is controlled to increase, and the reduced flow of the capillary and the increased rotating speed of the condenser fan are kept for a time ta to remove supercooling.
2. A method for controlling an instant freezing chamber, which performs instant freezing preservation on the instant freezing chamber by controlling a cooling device, is characterized in that:
the object to be cooled is subjected to instant freezing preservation in an instant freezing chamber, and the temperature of the object to be cooled is controlled by controlling the cooling of the instant freezing chamber;
the instant freezing preservation process with a multi-stage supercooling and cooling process, a supercooling relieving process and a conventional refrigeration preservation process is carried out on the cooled object in the instant freezing chamber through a cooling device;
the multi-stage supercooling and cooling process comprises n cooling stages, wherein each cooling stage of the n cooling stages is provided with a preset operation target temperature and a preset operation duration; the multi-stage supercooling and cooling process carries out staged cooling on the cooled object according to a preset running target temperature and a preset running time;
in the final stage of the multi-stage supercooling and cooling process, after the preset stage cooling is completed within a preset time period, the flow of the capillary group is reduced to a second flow V2 from a first flow V1 by controlling the flow control valve, the rotating speed of the fan of the condenser is increased by the control device, the rotating speed of the fan of the condenser is increased to a second rotating speed S2 of the fan from a first rotating speed S1 of the fan, and S2 is the maximum rotating speed of the fan of the condenser;
the flow of the capillary group keeps the second flow V2 and the condenser fan keeps the second rotating speed S2 of the fan to jointly operate for the preset ta time, the maximum cooling capacity is provided for the instant freezing chamber, and supercooling is removed.
3. The instant freezer control method of claim 2, wherein: the value range of the preset operation ta time is that ta is more than 0h and less than or equal to 10 h.
4. A method of controlling an instant freezer as claimed in claim 3 wherein: after the multi-stage supercooling and cooling process is finished, the timer transmits a signal of finishing the supercooling and staged cooling process to the controller; the controller sends an instruction for reducing the flow of the capillary group to the capillary flow path control valve, and simultaneously sends an instruction for increasing the rotating speed of the condenser fan to the rotating speed adjusting device of the condenser fan; when the conditions of the capillary group flow rate reduction to the preset second flow rate V2 and the condenser fan rotation speed increase to the preset fan second rotation speed S2 are simultaneously met, the timer starts timing to operate the capillary group at the second flow rate V2 and the condenser fan at the fan second rotation speed S2 together for a time ta.
5. The instant freezer control method of claim 4, wherein: in the 1 st stage of the multi-stage supercooling and cooling process, the rotating speed of the compressor runs at the second maximum rotating speed M2; after the temperature reduction in the 1 st stage of the multi-stage supercooling temperature reduction process is finished, the rotating speed of the compressor is operated at a first rotating speed M1 which is lower than a second rotating speed M2 of the compressor.
6. The instant freezer control method of claim 5, wherein: and the n cooling stages are at least at the last cooling stage, and are stabilized at the preset target temperature for a period of time after reaching the cooling target until the preset time of the cooling process is finished.
7. The instant freezer control method of claim 6, wherein: n cooling stages exist in the cooling process, the n cooling stages are divided into stages 1, … … i and … … n, wherein the cooling stage i represents any one of the n cooling stages, i is more than or equal to 1 and less than or equal to n, n is a natural number and is more than or equal to 2, the air supply device is controlled to start and stop according to the preset temperature of the cooling stage, namely T is used for controlling the air supply device to start and stopONi＝Ti+TB1The temperature T is used as the starting temperature point of the air supply device in the ith stageoffi＝TONi-TB2/2As a shutdown temperature point of the blower in the i-th stage, where TB1Indicates the floating temperature T of the starting point of the instantaneous freezing chamber in the starting process of the compressorB2Temperature difference between instant freezing chamber start and stop, TONi>Ti>Toffi；
In the i-th stage:
when the storage temperature of the instant freezing chamber reaches TONi＝Ti+TB1When the pressure exceeds 2, the air supply device is controlled to work;
when the storage temperature of the instant freezing chamber reaches Toffi＝TONi-TB2And when the pressure exceeds 2, controlling the air supply device not to work.
8. The instant freezer control method of claim 7, wherein: the air supply device is a cold air supply door for implementing cold supply control of the instant freezing chamber.
9. The instant freezer control method of claim 8, wherein: the value range of the time ti for cooling control on the cooled object in the ith stage in the multi-stage supercooling and cooling process is 0h < ti is less than or equal to 8 h.
10. The instant freezer control method of claim 9, wherein: the preset target temperature of the multi-stage supercooling cooling process meets the following requirements: t1 is more than or equal to 0 ℃ at the temperature of 5 ℃; tn is more than or equal to-15 ℃, T2 is more than or equal to 0 ℃, i is more than or equal to 2 and less than or equal to n.
11. The instant freezer control method of claim 10, wherein: in the conventional refrigeration storage process, the cooled object is operated according to the preset temperature Tc, wherein Tc is more than or equal to minus 7 ℃ and less than 0 ℃.
12. The instant freezer control method of claim 11, wherein: the control method for the conventional storage process to operate according to the preset temperature Tc comprises the following steps: when the temperature of the instant freezing chamber (12) reaches the starting temperature point TONc, opening an air door of the instant freezing chamber (12); when the temperature of the instant freezing chamber reaches a first shutdown temperature point TOFFc, closing the air door of the instant freezing chamber; t isONc＝Tc+TB1/2,TOFFc＝TONc–TB2/2；TB1Indicating the floating temperature of a starting point of an instant freezing chamber in the starting process of the compressor; t isB2The temperature difference between the start and stop of the instant freezing chamber.
13. The instant freezer control method of claim 12, wherein: t isB1The value range of (A) is 0 DEG C<TB1≤2℃，TB2The value range of (A) is 0 DEG C<TB2≤2℃。
14. A method of controlling an instant freezer as claimed in any one of claims 2 to 13 wherein: in the multi-stage supercooling and cooling process, in the process of performing the staged cooling on the cooled object, the flow rates of the capillary group are kept unchanged and are the first flow rate V1, and the rotating speeds of the fans of the condenser are the first rotating speed S1 of the fans.
15. The instant freezer control method of claim 14, wherein: the flow rates of the capillary group in the conventional preservation process are all first flow rates V1, and the fan rotating speeds of the condenser are all first rotating speeds S1 of the fan.
16. A refrigerator, characterized in that: the refrigerator comprises an instant freezing chamber (12), and the instant freezing chamber (12) adopts the instant freezing chamber control method of any one of claims 2 to 15.
CN201911046632.0A 2019-10-30 2019-10-30 Instant freezing chamber control method and refrigerator Pending CN110953798A (en)

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CN101636625A (en) * 2007-04-17 2010-01-27 三菱电机株式会社 Refrigerator and method of refrigeration
CN102472549A (en) * 2009-07-10 2012-05-23 松下电器产业株式会社 Storage apparatus, and storage method
CN106461304A (en) * 2014-05-20 2017-02-22 三菱电机株式会社 Refrigerator
CN109253572A (en) * 2018-09-12 2019-01-22 合肥晶弘电器有限公司 A kind of refrigeration equipment and its control method of achievable supercooling preservation

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101375120A (en) * 2006-02-15 2009-02-25 Lg电子株式会社 Apparatus for supercooling, and method of operating the same
CN101636625A (en) * 2007-04-17 2010-01-27 三菱电机株式会社 Refrigerator and method of refrigeration
CN102472549A (en) * 2009-07-10 2012-05-23 松下电器产业株式会社 Storage apparatus, and storage method
CN106461304A (en) * 2014-05-20 2017-02-22 三菱电机株式会社 Refrigerator
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