CN110953795A - Instant freezing chamber control method and refrigerator - Google Patents
Instant freezing chamber control method and refrigerator Download PDFInfo
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- CN110953795A CN110953795A CN201911045387.1A CN201911045387A CN110953795A CN 110953795 A CN110953795 A CN 110953795A CN 201911045387 A CN201911045387 A CN 201911045387A CN 110953795 A CN110953795 A CN 110953795A
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- 230000008014 freezing Effects 0.000 title claims abstract description 180
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- 230000008569 process Effects 0.000 claims abstract description 108
- 238000004781 supercooling Methods 0.000 claims abstract description 82
- 238000004321 preservation Methods 0.000 claims abstract description 30
- 238000005057 refrigeration Methods 0.000 claims abstract description 28
- 238000003860 storage Methods 0.000 claims abstract description 20
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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
- 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
- F25D2400/30—Quick freezing
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2600/00—Control issues
- F25D2600/02—Timing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2600/00—Control issues
- F25D2600/06—Controlling according to a predetermined profile
Abstract
The invention relates to a control method of an instant freezing chamber and a refrigerator. The instant freezing chamber control method comprises a multi-stage cooling and supercooling process, a supercooling relieving process and a conventional refrigeration preservation process. In the multi-stage cooling and supercooling process, the object to be cooled is cooled in stages, and the cooling in each stage is realized by cooling control on the object to be cooled, so that the object to be cooled can smoothly enter a supercooling state. 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 release process, the rotating speed of the compressor is increased to increase the cooling capacity of the cooled object, so that the aim of releasing the supercooling state is fulfilled, the cooled object is instantly frozen (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 refrigerator, 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 invention provides an instant freezing chamber control method and a refrigerator.
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 cooling and supercooling process, a supercooling relieving process and a conventional refrigeration preservation process. In the multi-stage cooling and supercooling process, the object to be cooled is cooled in stages, and the cooling in each stage is realized by cooling control on the object to be cooled, so that the object to be cooled can smoothly enter a supercooling state. 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 release process, the rotating speed of the compressor is increased, the cooling supply amount of the cooled object is increased to achieve the purpose of releasing the supercooling state, so that the cooled object is instantly frozen (instant freezing for short), and the frozen cooled object is stored at the normal refrigeration storage temperature for a long time.
Specifically, the method comprises the following steps:
the invention provides a refrigerator: the instant freezing device is provided with an instant freezing chamber (12), a cooling device for providing cold 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;
performing a flash freezing preservation process on the object to be cooled in a flash freezing chamber by performing a cooling control on the flash freezing chamber;
the cooling device comprises a compressor, an evaporator, a condenser and a capillary tube;
the control system comprises a controller, a timer and a temperature sensor;
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 running target temperature and the preset running time of each multi-stage cooling process; and after the multi-stage supercooling and cooling process is completed within a preset time period, controlling the rotating speed of the compressor to increase, removing supercooling, and keeping the rotating speed of the compressor after increasing for a time ta until the cooled object is completely frozen.
The invention also provides a method for controlling the instant freezing chamber, which implements instant freezing preservation control on the instant freezing chamber by controlling a cooling device, and is characterized in that:
the instant freezing preservation process with the process of supercooling and cooling, the process of supercooling release and the conventional refrigeration preservation process is carried out on the cooled object in the instant freezing chamber through a cooling device;
performing a flash freezing preservation process on the object to be cooled in a flash freezing chamber by performing a cooling control on the flash freezing chamber;
the supercooling and cooling process comprises n cooling stages, and each cooling stage of the n cooling stages is provided with a preset operation target temperature and preset operation duration; and in the supercooling and cooling process, the cooled object is cooled in stages according to the preset operation target temperature and the preset operation duration, and 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 rotating speed of the compressor is controlled to be increased, and the rotating speed of the compressor after being increased is kept for the time ta.
Preferably, the value range of the preset operation ta time is 0h < ta ≦ 10 h.
Preferably, in the first cooling stage of the supercooling cooling process, the rotation speed of the compressor is operated at a second rotation speed M2, and M2 is the maximum rotation speed of the compressor; and after the temperature reduction of the stage 1 is finished, the rotating speed of the compressor is operated at a first rotating speed M1 of the compressor, wherein M1< M2.
Preferably, in the process of n cooling stages in the cooling process, the n cooling stages are divided into stages 1, … … i and … … n, wherein the i cooling stage 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 n is more than or equal to 2; the start and stop of the air supply device are controlled according to the preset temperature in the cooling stage, namely TONi＝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 controlled to be a cooling air door 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 temperature of 5 ℃ is not less than T1>0 ℃ in the first stage of the multi-stage cooling and supercooling process; tn is more than or equal to 15 ℃ below zero and more than or equal to 1.T 2 is less than 0 ℃ and i is more than or equal to 2 and less than or equal to n in the multi-stage cooling process.
Preferably, the first rotation speed M1 of the compressor is greater than or equal to 1200rpm and less than or equal to M1 and less than or equal to 1400rpm, and the second rotation speed M2 of the compressor is greater than or equal to 3800rpm and less than or equal to M2 and less than or equal to 4500 rpm.
Preferably, the rotation speeds of the compressors in the conventional refrigeration preservation process are all first rotation speeds M1; the conventional refrigeration storage process implements cooling control on the cooled object, so that the cooled object runs according to a preset temperature Tc, and the Tc value range is that Tc is more than or equal to minus 7 ℃ and less than 0 ℃.
Preferably, the control method for the regular storage stage 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℃。
The invention also provides a refrigerator which is provided with the control system for realizing the instant freezing chamber control method. The refrigerator comprises an instant freezing chamber, and the instant freezing chamber adopts the instant freezing chamber control method to carry out instant freezing storage on the cooled object.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely exemplary embodiments of the present disclosure, and other drawings may be derived by those skilled in the art without inventive effort.
FIG. 1 is a control logic diagram of an embodiment of the present invention;
FIG. 2 is a diagram of a refrigeration system according to an embodiment of the present invention;
FIG. 3 is a refrigerant flow diagram according to an embodiment of the present invention;
FIG. 4 is a structural view of a refrigerator according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a freezing curve of water at normal freezing in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of the freezing curve of water in an embodiment of the present invention in the presence of a supercooling freezing process;
FIG. 7 is a schematic diagram of a refrigerator control system according to an embodiment of the present invention;
FIG. 8 is a graph of temperature versus time for a food product stored in a flash chamber throughout a sub-cooling process in accordance with an embodiment of the present invention;
in the figure:
refrigerator-10; a refrigerating chamber-11; instant freezing chamber-12; freezing chamber-13;
a refrigeration system-20; a refrigeration evaporator-21; a muffler assembly-220; a return gas heat exchange section-221; a compressor-23; condenser-24; anti-condensation pipe-25; a drier-filter-26; 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;
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 cooling and supercooled process. And in the supercooling relieving process, the rotating speed of the compressor is increased, and the supply of cold energy is increased, so that the supercooled state of the cooled object in the supercooling state in the instant freezing chamber is relieved, the instant freezing is realized, and uniform and fine ice crystals are formed. And finally, the temperature of the instant freezing chamber 12 is controlled to be within the range of the conventional refrigeration preservation temperature, so that the cooled object is preserved for a long time.
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings 1-4, and fig. 7 and 8:
the embodiment shown in fig. 2 provides a refrigeration system that performs any of the control methods of the present invention. The system comprises but is not limited to the following components: the refrigeration evaporator 21, the air return pipe assembly 220, the air return heat exchange section 221, the compressor 23, the condenser 24, the condensation preventing pipe 25, the drying filter 26 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.
The present embodiment also provides a control system, including: the controller 31 is in control connection with the display 32, the temperature sensor 33, the temperature adjusting device 34, the frequency conversion board 35 and the timer 36, the temperature adjusting device 34 is an air supply device of the instant freezing chamber, and the control system is used for any control method of the 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 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 control of the air supply device of the instant freezing chamber is the control of the air supply door of the instant freezing chamber.
The process of the control system for implementing the supercooling control on the cooled object can be as follows:
after the temperature control of the last cooling stage of the supercooling cooling process is finished, the controller sends an instruction for finishing the supercooling cooling process and simultaneously sends an instruction for starting the supercooling release process to the refrigerating system implementing the instant freezing chamber control method;
the instruction of the beginning of the supercooling release process triggers the compressor rotating speed adjusting device to be started, so that the rotating speed of the compressor is adjusted, and the rotating speed of the compressor is increased from a first rotating speed M1 to a second rotating speed M2;
and controlling the compressor to operate at the second rotating speed M2 for a time ta in the supercooling release process, and recovering the rotating speed of the compressor to the first rotating speed M1 after the time ta is finished.
The embodiment also provides a refrigerator which is provided with the control system for realizing the instant freezing chamber control method. The refrigerator comprises an instant freezing chamber 12, and the instant freezing chamber 12 carries out instant freezing storage on cooled objects by adopting the instant freezing chamber control method.
As shown in fig. 4, the refrigeration system performing any of the control methods of the present invention may be a refrigerator including a refrigerating chamber 11, an instant freezing chamber 12, and a freezing chamber 13, and the refrigerator according to the present invention has a control system therein, which enables the refrigerator to perform an instant freezing control process on an object to be cooled placed in the instant freezing chamber 12.
Further, the present embodiment relates to a display 32 provided on the refrigerator, the user can select the instant freezing function through the display 32, and the instant freezing chamber 12 performs the instant freezing chamber control method for the food when the user selects the instant freezing function.
Further, the user may select the instant freezing function through the display 32, and the control system performs the instant freezing chamber control method when the user selects the instant freezing function.
The instant freezing chamber can realize various low-temperature storage processes of food, such as a supercooling non-freezing storage process, a supercooling freezing removal storage process, a low-temperature refrigeration function, a freezing process and the like. The user can select the storage process according to the self needs, and the instant freezing chamber can only realize the instant freezing storage process shown in the embodiment.
The instant freezing chamber control method according to the present embodiment will be described in detail 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:
the multi-stage cooling process comprises n cooling stages, wherein 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 n is more than or equal to 2;
1, cooling stage: the instant freezing chamber is controlled by the controller 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 compressor second speed M2 is set to the compressor maximum speed to achieve a higher rate of cool down.
In the first cooling stage of the multi-stage cooling process, the cooling capacity can be increased by increasing the rotating speed of the compressor, the cooling efficiency is improved, and the object to be cooled can rapidly enter a small-range temperature interval containing the temperature of T1. The beneficial effects are that: when the object to be cooled needs to be cooled, the rotating speed of the compressor is increased, so that the cooling capacity is increased, the cooling rate of the instant freezing chamber is increased, the object to be cooled is enabled to be more quickly stabilized in the temperature vicinity of T1, and the early preparation time for the object to be cooled to enter the overcooling state is shortened. 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 containing the temperature T1, the overall temperature of the instantaneous freezing chamber is conveniently and uniformly reduced in the subsequent supercooling temperature reduction process, the temperature difference between the surface and the interior of the cooled object placed in the instantaneous freezing chamber is smaller, and the cooled object can smoothly enter a supercooling state in the subsequent staged temperature reduction process.
Furthermore, T1 is more than 0 ℃ at the temperature of 5 ℃ or more, and T1 is more than 0h at the temperature of 8h or more.
Further, before step S01, the method further includes the steps of: aS 01: the user selects the instant freeze function.
An i +1 th cooling stage: and after the 1 st temperature reduction stage is finished, the compressor is operated at a first rotating speed M1, and in the S01 multi-stage temperature reduction and supercooling process, the rotating speed M2 of the compressor is greater than M1. The method has the advantages that the rotating speed of the compressor at the S01B stage is recovered to M1, and the cooling capacity can be reduced by reducing the rotating speed of the compressor. When the cooled food enters the overcooling state, the slow cooling rate and the low cooling capacity are needed, so that the effect that the cooled food successfully enters the overcooling state and is not easily released from the overcooling state can be realized, and therefore, the effect can be realized by reducing the rotating speed of the compressor.
The multi-stage cooling and supercooling process comprises n cooling stages, wherein each cooling stage of the n cooling stages implements cooling control on a cooled object, temperature control is implemented on the cooled object according to the preset temperature Ti of the cooling stages, and meanwhile the operation Ti time of the ith cooling stage is controlled.
Further, in this embodiment, the control of the cooling of the food stored in the flash chamber is achieved by controlling the temperature of the flash chamber and by performing cooling control on the flash chamber.
Further, in 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 implementing cooling control on the cooled object in the ith stage in the supercooling and cooling process is 0h < ti ≦ 8h
The beneficial effects are that: the control of the cooling time ti is implemented through the timing device in each cooling stage, which is beneficial to reducing the temperature difference between the surface and the inside of the cooled object in each cooling stage, increasing the success probability of the overcooling of the cooled object, and also avoiding that the cooled object which has already entered the overcooling state can easily release the overcooling state in advance.
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.
Further, the value range of the preset operation ta time is that ta is more than 0h and less than or equal to 10 h.
Furthermore, Tn is more than or equal to-15 ℃ and less than or equal to Tn +1 is more than or equal to T2<0 ℃ and i is more than or equal to 2 and less than or equal to n in the S01B step in the multi-stage cooling and supercooling process.
S02: supercooling release process: after the temperature control of the last cooling stage of the supercooling cooling process is finished, the controller sends an instruction for finishing the supercooling cooling process and simultaneously sends an instruction for starting the supercooling release process to the refrigerating system implementing the instant freezing chamber control method;
the instruction of the supercooling release process is started to trigger the compressor rotating speed adjusting device to be started, and the rotating speed of the compressor is controlled to be increased from a first rotating speed M1 to a second rotating speed M2, wherein the second rotating speed M2 is the maximum rotating speed of the compressor.
The timing device controls the compressor to operate at the second rotating speed M2 for ta time in the supercooling release process, and the rotating speed of the compressor is recovered to the first rotating speed M1 after the operation is finished.
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. In the embodiment, the rotating speed of the compressor is increased to the second rotating speed M2, so that the temperature of cold air applied to the cooled object is reduced, the cold supply amount of the instant freezing chamber in the supercooling release process is increased, and the food is quickly released from the supercooling state. The rotating speed of the compressor is changed to increase the cooling capacity of the cooled object, so that the defect that the food is dehydrated and dried when the cooling capacity is increased by related means such as increasing the air quantity is avoided.
The rotating speed of the compressor is increased, so that the quantity of the refrigerant conveyed from the exhaust end of the compressor and the suction quantity of the refrigerant at the suction end of the compressor in unit time are increased, the circulation of the refrigerant in the pipeline is accelerated under the condition that the flow of a capillary tube of a refrigeration system is not changed, the refrigerating capacity of the evaporator is improved in unit time, the air temperature of a cavity of the evaporator is reduced, and low-temperature cold air can enter the instant freezing chamber through air channel circulation in the refrigerator of the embodiment, so that the aim of quickly cooling is fulfilled.
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 food thawing agent can better avoid the loss of nutrient substances of food after thawing and better maintain the flavor of the food.
S03: and (3) conventional refrigeration preservation process: the compressors are all operated at a first speed M1, and the instant freezing chamber is controlled within the normal refrigeration preservation temperature range according to the preset temperature Tc.
Further, the value range of the preset temperature Tc in the conventional refrigeration storage process is that Tc is more than or equal to minus 7 ℃ and less than 0 ℃.
Further, the method for controlling the instant freezing chamber within the conventional refrigeration preservation temperature range according to the preset temperature Tc by the conventional preservation phase chamber comprises the following steps: when the temperature of the instant freezing chamber reaches a first starting temperature point TONc, opening an air door of the instant freezing chamber; when the temperature of the instant freezing chamber reaches a first shutdown temperature point TOFFc, closing the air door of the instant freezing chamber; t isONc＝Tc+TB1/2,TOFFc＝TONc–TB2/2；TB1Indicating the floating temperature of a starting point of an instant freezing chamber in the starting process of the compressor; t isB2The temperature difference between the start and stop of the instant freezing chamber.
The method has the beneficial effect that the shelf life of the food in the supercooling process can be prolonged in the conventional refrigeration preservation. The opening and closing of the air door of the instant freezing chamber are controlled by judging the temperature of the instant freezing chamber, so that the functions of controlling the instant freezing chamber according to the preset temperature Tc and reducing energy consumption can be realized simultaneously, and the economic efficiency of the instant freezing chamber control method is improved.
As shown in fig. 8, fig. 8 is a graph of the temperature of the food stored in the instant freezing chamber as a function of time during the whole supercooling process according to the embodiment of the present invention. And (3) rapidly cooling the instant freezing chamber in the temperature range above zero degree in the S01A stage. The temperature of the food starts to be ready to enter the supercooled state at the low temperature region T1 slightly higher than zero. The stage S01B is a stage of supercooling, in which the temperature of the food is slowly reduced under the control of the cooling of the instant freezing chamber, the temperature of the food is lower than the freezing point of the food and is not frozen, and the food is successfully in a supercooled state. The supercooling release process of S02 in this embodiment increases the rotational speed of the condenser fan to increase the amount of cooling supplied to the flash chamber during the supercooling release process, thereby releasing the supercooled state from the temperature of the food. When the food is in the supercooling state, the food undergoes an instant freezing process, namely the temperature of the food is rapidly increased from the temperature lower than the freezing point in the supercooling state to the freezing point temperature, and the temperature of the food is maintained at the freezing point temperature for a period of time in the freezing process until the food is completely frozen. The instant freezing chamber is controlled at a preset temperature Tc during the regular refrigerated preservation at S03 such that the temperature of the food is lowered from the freezing point temperature to the Tc temperature, and the temperature of the food is maintained at substantially the Tc temperature during the subsequent regular refrigerated preservation.
Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (13)
1. A refrigerator characterized in that:
the instant freezing device is provided with an instant freezing chamber (12), a cooling device for providing cold 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;
performing a flash freezing preservation process on the object to be cooled in a flash freezing chamber by performing a cooling control on the flash freezing chamber;
the cooling device comprises a compressor, an evaporator, a condenser and a capillary tube;
the control system comprises a controller, a timer and a temperature sensor;
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 running target temperature and the preset running time of each multi-stage cooling process; and after the multi-stage supercooling and cooling process is completed within a preset time period, controlling the rotating speed of the compressor to increase, removing supercooling, and keeping the rotating speed of the compressor after increasing for a time ta until the cooled object is completely frozen.
2. A method for controlling an instant freezing chamber, which controls a cooling device to perform instant freezing preservation control on the instant freezing chamber, is characterized in that:
the instant freezing preservation process with the process of supercooling and cooling, the process of supercooling release and the conventional refrigeration preservation process is carried out on the cooled object in the instant freezing chamber through a cooling device;
performing a flash freezing preservation process on the object to be cooled in a flash freezing chamber by performing a cooling control on the flash freezing chamber;
the supercooling and cooling process comprises n cooling stages, and each cooling stage of the n cooling stages is provided with a preset operation target temperature and preset operation duration; and in the supercooling and cooling process, the cooled object is cooled in stages according to the preset operation target temperature and the preset operation duration, and 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 rotating speed of the compressor is controlled to be increased, and the rotating speed of the compressor after being increased is kept for the time ta.
3. The instant freezer control method of claim 2, wherein: the value range of the preset operation ta time is that ta is more than 0h and less than or equal to 10 h.
4. The instant freezer control method of claim 3, wherein: in the first cooling stage of the supercooling cooling process, the rotating speed of the compressor runs at a second rotating speed M2, and M2 is the maximum rotating speed of the compressor; and after the temperature reduction of the stage 1 is finished, the rotating speed of the compressor is operated at a first rotating speed M1 of the compressor, wherein M1< M2.
5. The instant freezer control method of claim 4, wherein: in the process of n cooling stages in the cooling process, the n cooling stages are divided into stages 1, … … i and … … n, wherein the i cooling stage 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 n is more than or equal to 2; the start and stop of the air supply device are controlled according to the preset temperature in the cooling stage, namely TONi＝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.
6. The instant freezer control method of claim 5, wherein: the air supply device is a cooling air door of the instant freezing chamber.
7. The instant freezer control method of claim 6, 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.
8. The instant freezer control method of claim 7, wherein: the temperature of 5 ℃ or more and T1 or more is more than 0 ℃ in the first stage of the multi-stage cooling and supercooling process; tn is more than or equal to 15 ℃ below zero and more than or equal to 1.T 2 is less than 0 ℃ and i is more than or equal to 2 and less than or equal to n in the multi-stage cooling process.
9. The instant freezer control method of claim 8, wherein: 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.
10. The instant freezer control method of claim 9, wherein: the rotating speeds of the compressors in the conventional refrigeration preservation process are all first rotating speeds M1; the conventional refrigeration storage process implements cooling control on the cooled object, so that the cooled object runs according to a preset temperature Tc, and the Tc value range is that Tc is more than or equal to minus 7 ℃ and less than 0 ℃.
11. The instant freezer control method of claim 10, wherein: the control method for the conventional storage stage 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.
12. The instant freezer control method of claim 11, wherein: t isB1The value range of (A) is 0 DEG C<TB1≤2℃，TB2The value range of (A) is 0 DEG C<TB2≤2℃。
13. 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 12.
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