CN110906627A - Instant freezing chamber control method and refrigerator - Google Patents
Instant freezing chamber control method and refrigerator Download PDFInfo
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- CN110906627A CN110906627A CN201911059802.9A CN201911059802A CN110906627A CN 110906627 A CN110906627 A CN 110906627A CN 201911059802 A CN201911059802 A CN 201911059802A CN 110906627 A CN110906627 A CN 110906627A
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
-
- 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
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. In the multi-stage supercooling and cooling process, the cooled object is cooled in stages, and the cooling of each stage is realized by cooling the cooled object in stages. And 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 for storing the cooled object in the process of a single temperature reduction stage is more uniform. In the supercooling relieving process, the equilibrium state of non-freezing moisture in the cooled object in the supercooling state is destroyed by reducing the flow of a capillary group in the refrigeration system, increasing the rotating speed of a fan of the condenser and starting the electric field generating device, so that the supercooling relieving is realized, the instant freezing (instant freezing for short) of the cooled object is further realized, and the frozen cooled object is stored for a long time at the conventional refrigeration storage temperature.
Description
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. In the multi-stage supercooling and cooling process, the cooled object is cooled in stages, and the cooling of each stage is realized by cooling the cooled object in stages. And 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 for storing the cooled object in the process of a single temperature reduction stage is more uniform. In the supercooling relieving process, the equilibrium state of non-freezing moisture in the cooled object in the supercooling state is destroyed by reducing the flow of a capillary group in the refrigeration system, increasing the rotating speed of a fan of the condenser and starting the electric field generating device, so that the supercooling relieving is realized, the instant freezing (instant freezing for short) of the cooled object is further realized, and the frozen cooled object is stored for a long time at the conventional refrigeration storage temperature.
Specifically, the method comprises the following steps:
the invention provides a refrigerator, which comprises:
the instant freezing chamber, 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 are arranged;
the instant freezing preservation process of the cooled object in the instant freezing chamber is realized by implementing cooling control on 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, and the capillary group is provided with a flow path control valve so that the flow of the capillary group can be adjusted;
a condenser fan is arranged on the condenser;
the control system includes: the device comprises a controller, a timer, a temperature sensor, a temperature adjusting device, an electric field generating device and a flow path control valve;
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 multi-stage supercooling and cooling process is completed within a preset time period, the flow control valve is controlled to reduce the flow of the capillary group and control the rotating speed of the condenser fan to increase, the reduced flow of the capillary group and the increased rotating speed of the condenser fan are kept for tb time, the electric field generating device is controlled to be started, the electric field generating device is ensured to operate for ta time in the started state, and supercooling is removed.
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 instant freezing preservation process of the cooled object in the instant freezing chamber is realized by implementing cooling control on 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 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, the rotating speed of the condenser fan is controlled to be increased from the first rotating speed S1 to the second rotating speed S2, the flow of the capillary group is kept for the second flow V2, the condenser fan is kept for the second rotating speed S2 to jointly run for the preset tb time, the electric field generating device is controlled to be started, the electric field generating device is guaranteed to run for the ta time in the started state, and supercooling is removed.
Preferably, the value range of the preset ta operating time is 0h < ta < 10h, and the value range of the preset tb operating time is 0h < tb < 10 h.
Preferably, in the 1 st stage of the multi-stage supercooling and cooling process, the rotating speed of the compressor is operated at the maximum rotating speed of M2, after the 1 st stage of the multi-stage supercooling and cooling process is finished, the compressor is operated at the first rotating speed of M1 in the subsequent multi-stage supercooling and cooling process, and M2 is greater than M1; in the final stage of the multi-stage supercooling and cooling process, after the preset cooling is completed within the preset time period, the flow path control valve is controlled to enable the capillary group to be switched to the pipeline with smaller flow, the rotating speed of the condenser fan is increased to the maximum value, and the electric field generating device is controlled to be started, at the moment, the flow of the capillary group is V2, and the rotating speed of the condenser fan is S2.
Preferably, the action of decreasing the flow rate of the capillary group and the action of increasing the rotation speed of the condenser fan may be performed simultaneously with or in a different order from the action of turning on the electric field generating device.
Preferably, the electric field generating device can control the instant freezing chamber to generate an electrostatic field or an alternating electric field.
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, the n cooling stages 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, the start and stop of the air supply device are controlled according to the preset temperature of the cooling stages, namely T is used for controlling the start and stop of the air supply deviceONi＝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 supercooling cooling stage 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 isB2The temperature difference between the start and stop of the instant freezing chamber.
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, in the process of performing the staged cooling on the object to be cooled, the rotation speed of the condenser fan is kept at the first rotation speed S1, the electric field generating device is in the closed state, and the flow rate of the capillary group is V1.
Preferably, the compressor rotation speed is kept unchanged to be the first rotation speed M1, the condenser fan rotation speed is kept unchanged to be the first rotation speed S1, the electric field generating device is in a closed state, and the flow rate of the capillary group is V1.
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 structural diagram of an instant freezing chamber according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a refrigerator control system according to an embodiment of the present invention;
FIG. 9 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; an electric field generating device power supply section-14;
a flash freezing storage area box-121; an electric field generating device discharge plate portion-122;
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 electrically operated 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, and meanwhile, the rotating speed of a condenser fan is increased, so that the purpose of increasing the supply of cold energy is achieved; and applying an electric field to the instant freezing chamber to destroy the supercooled and unfrozen state of the water or the ionic solution in the cooled object, and inducing the formation of ice nuclei, so that the supercooled state of the cooled object in the instant freezing chamber is removed, 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 embodiments of the invention is provided in conjunction with the accompanying fig. 1-4 and fig. 7-9:
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.
The purpose of reducing the flow rate of the refrigerant passing through the capillary tube in unit time can be achieved by reducing the flow of the capillary tube group, reducing the inner diameter of the capillary tube or increasing the total length of the capillary tube, so that the mass of the refrigerant entering the evaporator in unit time is reduced, when the suction pressure of the compressor is unchanged, the mass 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 can be reduced, and the air temperature of an evaporator chamber is reduced.
As shown in fig. 8: the control system related in the present embodiment includes: the controller 31 is connected with the display 32, the temperature sensor 33, the temperature adjusting device 34, the frequency conversion plate 35, the timer 36, the condenser fan 37, the electric field generating device power supply part 14, and the electric switching valve 28, wherein the controller 31 is connected with the display 32, the temperature sensor 33, the temperature adjusting device 34, the frequency conversion plate 35, the timer 36, the condenser fan 37, the electric field generating device power supply part 14 in a control mode, and the electric switching valve 28 is used for controlling the rotating speed of the compressor. The control system is used for realizing the instant freezing chamber control method provided by the 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 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 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.
Furthermore, the electric field generating device in the control system can enable the instant freezing chamber to generate an electrostatic field or an alternating electric field, the electric field generating device can be controlled by the control device to generate electric fields with different intensities, and the frequency of the electric field and other electric field related physical quantities can be controlled.
Further, the instant freezing chamber is provided with a temperature sensor, the surface temperature of the cooled object and/or the central temperature of the cooled object stored in the instant freezing chamber can be detected, and a temperature signal is transmitted to the controller, and the controller further controls and adjusts the type of the electric field generated by the electric field generating device, the electric field intensity and the frequency of the alternating electric field according to the analysis and processing of the temperature signal.
The beneficial effects are that: different electric field types, different electric field intensities and electric field frequencies play different roles in different stages in the whole process of supercooling release. The water transition from the liquid phase to the solid phase goes through two processes: first, the ice core forming processFollowed by an ice crystal growth process. For food, especially fresh meat and fresh fruit and vegetable, the cell solution contains different ions (such as Na)+，K+Cl-etc.) different electric field types and different electric field frequencies have different effects and actions on the supercooling release process of the chilled food. The temperature detection of the cold fresh food in the supercooling stage can judge that the cold fresh food is in different stages of the supercooling removing process, including the formation of crystal nuclei and the growth of ice crystals. Electric fields of different types and strengths are applied aiming at different stages of the supercooling relieving process of the cold fresh food, the supercooling relieving of the cold fresh food is fully realized, and ice crystals which are uniformly distributed, small in size and mellow are formed.
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 12, and the instant freezing chamber 12 carries out instant freezing storage on cooled objects by adopting the instant freezing chamber control method. The cooled material can be food, especially fresh meat food.
As shown in fig. 4, the refrigeration system performing any of the control methods of the present embodiment may be a refrigerator including a refrigerating compartment 11, an instant freezing compartment 12, a freezing compartment 13, and an electric field generating device power supply section 14, and the refrigerator according to the present invention has a control system that enables the refrigerator to perform an instant freezing control process on food placed in the instant freezing compartment 12.
The instant freezing chamber 12 in this embodiment 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.
When the refrigerator implementing the instant freezing chamber control method is an air-cooled refrigerator, the rotating speed of a freezing fan of the instant freezing chamber is kept unchanged in the whole process of implementing the instant freezing chamber control method.
As shown in fig. 7, the instant freezing storage area box 121 is included in the instant freezing chamber, and an electric field generating device discharging plate part 122 is included, and the electric field generating device discharging plate part 122 is disposed at the bottom of the instant freezing storage area box 121.
Further, fig. 7 is only an example of the structure and position of the discharge plate of the electric field generating apparatus of the present invention, and should not be construed as a limitation to the implementation of the present invention. The discharge plates can be arranged on the periphery or the top of the instant freezing chamber, and the number of the discharge plates is more than or equal to one.
The instant freezing chamber control method related to the present invention is 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 and supercooling process and are divided into the 1 st stage, … … i stage and the … … 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 limitations on any one stage are replaced by the ith stage.
1, cooling stage: the instant freezing chamber is controlled by the control device to operate at the preset temperature T1 for T1 time, and the compressor operates at the second rotating speed M2 during T1 time.
Further, the second compressor rotation speed M2 is the maximum compressor rotation speed.
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.
The beneficial effects are that: when the food needs to be cooled, the rotating speed of the compressor is increased, so that the cooling capacity can be increased, the cooling rate of the instant freezing chamber is increased, the food is quickly stabilized near the temperature T1, and the temperature T1 is in a low-temperature interval above zero. Thereby shortening the preliminary preparation time for the food to enter the supercooled state. The first temperature reduction 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 which is zero and contains the temperature T1, the overall temperature of the instantaneous freezing chamber is uniformly reduced in the subsequent multi-stage supercooling temperature reduction process, the temperature difference between the surface and the inside of the food placed in the instantaneous freezing chamber is smaller, and the food can smoothly enter a supercooling state in the subsequent staged temperature reduction process.
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 cooling stage is finished, the compressor is operated at a first rotating speed M1, in the whole multi-stage cooling and supercooling process of S01, the power supply generating device is always in a closed state, the rotating speed of a condenser fan is kept at the first rotating speed S1, the flow of a capillary group is V1, and the rotating speed of the compressor is M2> M1. 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 supercooling and cooling stage comprises n cooling stages, each cooling stage of the n cooling stages implements cooling control on the food, temperature control is implemented on the food according to the preset temperature Ti of the cooling stage, 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 tn is implemented through the timer and the controller 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: after the temperature control in the last cooling stage of the multi-stage supercooling cooling process is finished, the control device sends out an instruction for finishing the multi-stage supercooling cooling process and simultaneously sends out an instruction for starting the supercooling release process to the refrigerating system implementing the instant freezing chamber control method.
The refrigerating system for implementing the instant freezing chamber control method comprises a capillary group, wherein the capillary group is formed by connecting at least two capillaries with different rated flows in parallel, and one end of a refrigerant entering the capillary group is provided with a capillary group flow path control valve.
And triggering the flow control valve of the capillary group by the instruction of the beginning of the supercooling release process to control the flow of the capillary group to be reduced, and triggering the rotating speed adjusting device of the condenser fan by the instruction of the beginning of the supercooling release process to control the rotating speed of the condenser fan to be reduced.
The instruction of the start of the supercooling release process triggers a switch of the electric field generating device, the electric field generating device is started, a temperature sensor of the instant freezing chamber transmits temperature signals of food stored in the instant freezing chamber, including surface temperature and/or internal temperature of the food to the controller in real time, the controller obtains different phase change stages of the supercooling release process of the food through analysis and processing of the temperature signals, and then the controller adjusts the type of an electric field generated by the electric field generating device, the electric field intensity, the electric field frequency and other related parameters according to the analyzed and processed temperature signals of the instant freezing chamber.
Further, the action of opening the electric field generating device, the action of reducing the flow of the capillary group and the action of increasing the flow of the condenser fan can be performed simultaneously or in different orders.
The beneficial effects are that: the supercooled state is an unstable state, and a certain stimulus is required to release the supercooled state, and such a stimulus may be a temperature factor or a physical factor. On one hand, the flow of the capillary group is adjusted by the capillary group flow path control valve, so that the flow of the capillary group is reduced, the temperature of cold air applied to food is reduced, and the cold supply amount of the instant freezing chamber 2 in the stage of supercooling release is increased. On the other hand, different electric field types are applied to the food supercooling relieving process, and different electric field strengths and electric field frequencies are adjusted, so that the electric field can play different roles in different stages in the whole food supercooling relieving process. If the supercooling stage is just released to promote the nucleation, the growth of the ice crystals is inhibited in the ice crystal growth stage, and the bacteriostasis effect is also achieved. The flow of the capillary group is adjusted and the electric field is applied to the instant freezing chamber, so that the time for releasing the overcooling state of the food can be shortened, the overcooling state of the food can be released more easily, and the formed ice crystals are distributed more uniformly. The flow of the capillary group is changed in the instant freezing chamber, and the electric field is additionally arranged to change the cooling capacity of the food, so that the defect that the food is dehydrated and dried when the cooling capacity is increased by an air cooling means is overcome.
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 second rotating speed of the condenser fan is the maximum rotating speed, the second rotating speed S2 of the condenser fan is greater than or equal to 1600rpm and less than or equal to S2 and less than or equal to 1900rpm, and the first rotating speed S1 of the condenser fan is greater than or equal to 1200rpm and less than or equal to S1 and less than or equal to 1500 rpm.
Further, after the capillary bank flow is reduced to V2 and the condenser fan speed is increased to S2, the capillary bank flow is controlled to maintain V2 operation and the condenser fan speed is maintained at S2 operation tb time.
Furthermore, the value range of the time tb is 0h < tb ≦ 10 h.
Further, after the electric field generating device is started, the electric field is controlled to be kept on for ta time.
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 compressor at the first rotating speed M1, restoring the flow rate of the capillary to the first flow rate V1 by controlling a flow path control valve of the capillary group, closing the electric field generating device by the control device, and controlling the instant freezing chamber to be in the conventional refrigeration preservation temperature range according to the preset temperature Tc.
Further, the value range of the preset temperature Tc in the conventional refrigeration storage stage 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: instant freezing chamberThe temperature 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. 9, fig. 9 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 (17)
1. A refrigerator characterized in that:
the instant freezing chamber, 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 are arranged;
the instant freezing preservation process of the cooled object in the instant freezing chamber is realized by implementing cooling control on 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, and the capillary group is provided with a flow path control valve so that the flow of the capillary group can be adjusted;
a condenser fan is arranged on the condenser;
the control system includes: the device comprises a controller, a timer, a temperature sensor, an electric field generating device and a flow path control valve;
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 and cooling process is completed within a preset time period, supercooling is removed, the flow control valve is controlled to reduce the flow of the capillary tube group and control the rotating speed of the condenser fan to increase, the reduced flow of the capillary tube group and the rotating speed of the condenser fan are kept running for tb time, the electric field generating device is controlled to be started, and the electric field generating device is guaranteed to run for ta time in the started state.
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 instant freezing preservation process of the cooled object in the instant freezing chamber is realized by implementing cooling control on 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 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, the rotating speed of the condenser fan is controlled to be increased from the first rotating speed S1 to the second rotating speed S2, the flow of the capillary group is kept for the second flow V2, the condenser fan is kept for the second rotating speed S2 to jointly run for the preset tb time, the electric field generating device is controlled to be started, the electric field generating device is guaranteed to run for the ta time in the started state, and supercooling is removed.
3. The instant freezer control method of claim 2, wherein: the value range of the preset ta running time is 0h < ta < 10h, and the value range of the preset tb running time is 0h < tb < 10 h.
4. The instant freezer control method of claim 3, wherein: in the 1 st stage of the multi-stage supercooling and cooling process, the rotating speed of a compressor runs at the maximum rotating speed M2, after the 1 st stage of the multi-stage supercooling and cooling process is finished, the compressor runs at the first rotating speed M1 in the subsequent multi-stage supercooling and cooling process, and M2 is more than M1; in the final stage of the multi-stage supercooling and cooling process, after the preset cooling is completed within the preset time period, the flow path control valve is controlled to enable the capillary group to be switched to the pipeline with smaller flow, the rotating speed of the condenser fan is increased to the maximum value, and the electric field generating device is controlled to be started, at the moment, the flow of the capillary group is V2, and the rotating speed of the condenser fan is S2.
5. The instant freezer control method of claim 4, wherein: the action of decreasing the flow rate of the capillary group and the action of increasing the rotation speed of the condenser fan can be performed simultaneously with or in a different order from the action of turning on the electric field generating device.
6. The instant freezer control method of claim 5, wherein: the electric field generating device can control the instant freezing chamber to generate an electrostatic field or an alternating electric field.
7. The instant freezer control method of claim 6, 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.
8. The instant freezer control method of claim 7, 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[ 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.
9. The instant freezer control method of claim 8, wherein: the air supply device is a cold air supply door for implementing cold supply control of the instant freezing chamber.
10. The instant freezer control method of claim 9, 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.
11. The instant freezer control method of claim 10, wherein: the preset target temperature in the supercooling cooling stage 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.
12. The instant freezer control method of claim 11, 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 ℃.
13. The instant freezer control method of claim 12, 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.
14. The instant freezer control method of claim 13, wherein: t isB1Is gotThe value range was 0 deg.C<TB1≤2℃，TB2The value range of (A) is 0 DEG C<TB2≤2℃。
15. A method of controlling an instant freezer as claimed in any one of claims 2 to 14 wherein: in the multi-stage supercooling and cooling process, in the process of performing staged cooling on the cooled object, the rotating speed of the fan of the condenser is kept unchanged to be the first rotating speed S1, the electric field generating device is in a closed state, and the flow rate of the capillary group is V1.
16. The instant freezer control method of claim 15, wherein: in the conventional preservation process, the rotating speed of the compressor is kept unchanged and is the first rotating speed M1, the rotating speed of the fan of the condenser is kept unchanged and is the first rotating speed S1, the electric field generating device is in a closed state, and the flow of the capillary group is V1.
17. 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 16.
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| WO2024025588A1 (en) * | 2022-07-28 | 2024-02-01 | Palo Alto Research Center Incorporated | Feedback-based nucleation control during supercooling |
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