CN110701859A - Instant freezing chamber control method and refrigerator - Google Patents
Instant freezing chamber control method and refrigerator Download PDFInfo
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- CN110701859A CN110701859A CN201911045342.4A CN201911045342A CN110701859A CN 110701859 A CN110701859 A CN 110701859A CN 201911045342 A CN201911045342 A CN 201911045342A CN 110701859 A CN110701859 A CN 110701859A
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- cooling
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- freezing chamber
- supercooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
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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
- 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
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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
- F25D2600/00—Control issues
- F25D2600/02—Timing
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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
- 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. 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 balance state of unfreezing of the cooled object in the supercooling state is destroyed by three means of increasing the rotating speed of the compressor, increasing the rotating speed of the condensing fan and starting the electric field generating device, the supercooling state is fully relieved, the cooled object is frozen instantly (instant freezing for short), and the frozen cooled object is stored at the conventional refrigeration storage temperature for a long time.
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 balance state of unfreezing of the cooled object in the supercooling state is destroyed by three means of increasing the rotating speed of the compressor, increasing the rotating speed of the condensing fan and starting the electric field generating device, the supercooling state is fully relieved, the cooled object is frozen instantly (instant freezing for short), and the frozen cooled object is stored at the conventional refrigeration storage temperature for a long time.
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;
a condenser fan is arranged on the condenser;
the control system includes: the device comprises a controller, a timer, a temperature sensor and an electric field generating device;
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 supercooling cooling process stage; and 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 rotating speed of the compressor is controlled to be increased, the rotating speed of the condenser fan is controlled to be increased, the increased rotating speed of the compressor and the increased rotating speed of the condenser fan are kept to run for tb time, the electric field generating device is controlled to be started, the electric field generating device is ensured to run for ta time in the starting 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;
and in the final stage of the multi-stage supercooling and cooling process, after the preset stage cooling is finished within a preset time period: controlling the rotation speed of the compressor to increase from the first rotation speed M1 to the second rotation speed M2, and simultaneously controlling the rotation speed of the fan of the condenser to increase from the first rotation speed S1 of the fan to the second rotation speed S2 of the fan; the rotation speed of the compressor keeps a second rotation speed M2 and the rotation speed of the condenser fan keeps a second rotation speed S2 of the fan to jointly run for a preset tb time; and controlling the electric field generating device to be started, ensuring the electric field generating device to run for a time ta in a started state, and removing the supercooling.
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 tb ≧ ta.
Preferably, in the 1 st stage of the multi-stage supercooling and cooling process, the rotation speed of the compressor is operated at the second rotation speed M2, and after the temperature reduction in the 1 st stage of the multi-stage supercooling and cooling process is finished, the compressor is operated at the first rotation speed M1 in the subsequent supercooling and cooling process.
Preferably, the condenser fan is kept running at a first fan rotating speed S1 in the whole multi-stage supercooling and cooling process; in the final stage of the multi-stage supercooling and cooling process, after the preset cooling is finished in the preset time period, the rotating speed of the compressor is controlled to be increased to a second rotating speed M2, and the rotating speed of the fan of the condenser is controlled to be increased to a second rotating speed S2 of the fan; the second rotation speed M2 is the maximum rotation speed of the compressor, and the second rotation speed S2 is the maximum rotation speed of the condenser fan.
Preferably, the action of increasing the rotation speed of the compressor by the controller and the action of increasing the rotation speed of the condenser fan by the controller 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 instant freezing chamber is temperature-regulated by a cold air supply door of the air supply device.
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 reaches the 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.
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 electric field generating device is in a closed state in the process of performing the staged cooling on the object to be cooled.
Preferably, the conventional preservation process compressor is operated at a first rotational speed M1, the condenser fan is operated at a fan first rotational speed S1, and the electric field generating device is in an off state.
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; capillary-27;
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. In the supercooling relieving process, the rotating speed of the compressor is increased, and the rotating speed of the condensing fan is increased at the same time, so that the supply of cold energy is increased; 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 present invention is provided in conjunction with the accompanying fig. 1-4 and fig. 7-9:
the present invention provides a refrigeration system that performs any of the control methods of the present invention as shown in fig. 2. 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 and the capillary tube 27.
As shown in fig. 3, the refrigerant flow direction when the refrigeration system is in operation is: compressor → condenser → anti-condensation tube → dry filter → capillary tube → refrigeration evaporator → return air tube component → compressor.
As shown in fig. 8, the control system according to the present embodiment includes: 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, the condenser fan 37 and the electric field generating device power supply part 14, and 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, the condenser fan 37 and the electric field generating device power supply part 14 to control 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 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 parameters can also be controlled.
Further, the instant freezing chamber is provided with a temperature sensor, the surface temperature of the cooled object stored in the instant freezing chamber and the central temperature of the cooled object 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 an ice nucleation process and then 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 fresh 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, 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 refrigerating system performing any of the control methods of the present invention may be a refrigerator including a refrigerating chamber 11, a flash freezing chamber 12, a freezing chamber 13, and an electric field generating apparatus power supply portion 14, and the refrigerator according to the present invention has a control system that enables the refrigerator to perform a flash freezing control process for food placed in the flash freezing chamber 2.
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.
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.
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 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 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 instant freezing chamber to operate according to the preset temperature T1, so that the temperature of the instant freezing chamber is kept in a small-range temperature interval containing the temperature T1, the overall temperature of the instant freezing chamber is conveniently and uniformly reduced in the subsequent supercooling temperature reduction process, the temperature difference between the surface and the inside of the food placed in the instant 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: and after the step of the 1 st cooling stage is finished, the compressor is operated at a first rotating speed M1, in the S01 multi-stage cooling and supercooling process, the power supply generating device is always in a closed state, the condensing fan is always operated at the first rotating speed S1 of the fan, and the rotating speed M2 of the compressor is more than 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, wherein 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 the operation time t of the ith cooling stage is controlled simultaneously.
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.
Further, the value range of the time ti for performing cooling control on the cooled object in the ith stage in the 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: at the final stage of the multi-stage supercooling and cooling process, after the preset stage cooling is completed within a preset time period, the compressor rotating speed adjusting device is controlled to enable the rotating speed of the compressor to be increased from the first rotating speed M1 to the second rotating speed M2, meanwhile, the condenser fan is controlled to be increased from the first rotating speed S1 of the fan to the second rotating speed S2 of the fan, the rotating speed of the compressor keeps the second rotating speed M2 and the rotating speed of the condenser fan keeps the second rotating speed S2 of the fan to run together for a preset tb time, the controller controls the electric field generating device to be started in the supercooling relieving process, and the electric field generating device is guaranteed to run for a ta time in the starting state, and supercooling is.
Further, the second rotation speed M2 to which the compressor is increased is the maximum rotation speed of the compressor.
Further, the action of increasing the rotation speed of the compressor by the controller and the action of increasing the rotation speed of the condenser fan by the controller may be performed simultaneously with or in a different order from the action of turning on the electric field generating device.
Further, tb is more than or equal to ta, namely the compressor still keeps the second rotating speed M2 for a period of time after the electric field generating device is closed or the compressor is recovered to the smaller first rotating speed M1 while the electric field generating device is closed. The beneficial effects are that: the electric field has a large influence on the nucleation of the solution contained inside the food and the growth process of the ice crystals. Therefore, the electric field can be added in the early stage of the supercooling relieving stage to promote the nucleation of the supercooled food, and the electric field has the effect of inhibiting the growth of ice crystals in the ice crystal growth stage of the food in the supercooling relieving process. The final stage of the supercooling relieving process is a stage of completely freezing the food, an electric field can be added or not added in the process, but the compressor still needs to keep a larger or maximum rotating speed to promote the food to be completely frozen as soon as possible.
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. On one hand, the rotation speed of the compressor is increased, the higher the rotation speed is, the higher the compression ratio is in unit time, the exhaust volume is also increased, the circulation of the refrigerant is accelerated, the refrigeration effect is improved, and the purpose of increasing the cooling capacity supplied to the instant freezing chamber 2 in the supercooling release stage is achieved. 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 rotating speed of the compressor is increased, 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 rotating speed of the compressor is increased in the instant freezing chamber 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 method 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.
Further, the second fan speed S2 is the maximum condenser fan speed.
Further, when the condenser fan is operated at S2 while the compressor is operated at M2, the instant freezing chamber 12 can be supplied with the maximum cooling capacity to release the supercooling process.
Furthermore, the value range of S1 is 1200rpm < S1 < 1500rpm, and the value range of S2 is 1600rpm < S2 < 1900 rpm.
Furthermore, the value range of the time tb is 0h < tb ≦ 10 h.
Furthermore, the value range of the time ta is 0h < ta ≦ 10 h.
S03: and (3) conventional refrigeration preservation process: controlling the rotation speed of the compressor to be reduced to a first rotation speed M1 and controlling the rotation speed of the condenser fan to be reduced to a first rotation speed S1 by the control device after the compressor fan and the condenser fan respectively keep the second rotation speed M2 of the compressor and the second rotation speed S2 of the fan to simultaneously operate for tb in the supercooling removing process; in the conventional refrigeration and preservation process, the compressors run at a first rotating speed M1, and the condenser fans run at a fan first rotating speed S1; the electric field generating device is kept in a closed state all the time in the conventional refrigeration preservation process. The controller controls the instant freezing chamber to be within 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: 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. 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 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 (19)
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;
a condenser fan is arranged on the condenser;
the control system includes: the device comprises a controller, a timer, a temperature sensor and an electric field generating device;
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 supercooling cooling process stage; after the multi-stage supercooling and cooling process is completed within a preset time period, supercooling is removed, the rotating speed of the compressor is controlled to be increased, the rotating speed of the fan of the condenser is controlled to be increased, the rotating speed of the increased compressor and the rotating speed of the increased fan of the condenser are kept to run 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;
and in the final stage of the multi-stage supercooling and cooling process, after the preset stage cooling is finished within a preset time period: controlling the rotation speed of the compressor to increase from the first rotation speed M1 to the second rotation speed M2, and simultaneously controlling the rotation speed of the fan of the condenser to increase from the first rotation speed S1 of the fan to the second rotation speed S2 of the fan; the rotation speed of the compressor keeps a second rotation speed M2 and the rotation speed of the condenser fan keeps a second rotation speed S2 of the fan to jointly run for a preset tb time; and controlling the electric field generating device to be started, ensuring the electric field generating device to run for a time ta in a started state, and removing the supercooling.
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: tb is more than or equal to 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 rotating speed M2, and 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 supercooling and cooling process.
6. The instant freezer control method of claim 5, wherein: the condenser fan keeps a first fan rotating speed S1 to operate in the whole multi-stage supercooling and cooling process; in the final stage of the multi-stage supercooling and cooling process, after the preset cooling is finished in the preset time period, the rotating speed of the compressor is controlled to be increased to a second rotating speed M2, and the rotating speed of the fan of the condenser is controlled to be increased to a second rotating speed S2 of the fan; the second rotation speed M2 is the maximum rotation speed of the compressor, and the second rotation speed S2 is the maximum rotation speed of the condenser fan.
7. The instant freezer control method of claim 6, wherein: the action of increasing the rotation speed of the compressor by the controller and the action of increasing the rotation speed of the condenser fan by the controller can be performed simultaneously with the action of opening the electric field generating device or in different orders.
8. The instant freezer control method of claim 7, wherein: the electric field generating device can control the instant freezing chamber to generate an electrostatic field or an alternating electric field.
9. The instant freezer control method of claim 8, 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.
10. The instant freezer control method of claim 9, 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.
11. The instant freezer control method of claim 10, wherein: the air supply device is a cold air supply door for implementing cold supply control of the instant freezing chamber.
12. The instant freezer control method of claim 11, 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.
13. The instant freezer control method of claim 12, 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.
14. The instant freezer control method of claim 13, 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 ℃.
15. The instant freezer control method of claim 14, 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 reaches the 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 instant freezing chamberA damper; 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.
16. The instant freezer control method of claim 15, wherein: t isB1The value range of (A) is 0 DEG C<TB1≤2℃，TB2The value range of (A) is 0 DEG C<TB2≤2℃。
17. A method of controlling an instant freezer as claimed in any one of claims 2 to 16 wherein: in the multi-stage supercooling and cooling process, the electric field generating device is in a closed state in the process of carrying out the staged cooling on the cooled object.
18. The instant freezer control method of claim 17, wherein: the compressor is operated at a first rotational speed M1, the condenser fan is operated at a fan first rotational speed S1, and the electric field generating device is in an off state.
19. 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 18.
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Application publication date: 20200117 |