CN110986456A - Instant freezing control method for refrigeration equipment and refrigeration equipment - Google Patents

Instant freezing control method for refrigeration equipment and refrigeration equipment Download PDF

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Publication number
CN110986456A
CN110986456A CN201911047991.8A CN201911047991A CN110986456A CN 110986456 A CN110986456 A CN 110986456A CN 201911047991 A CN201911047991 A CN 201911047991A CN 110986456 A CN110986456 A CN 110986456A
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Prior art keywords
stage
compressor
preset
cooling
supercooling
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CN201911047991.8A
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Chinese (zh)
Inventor
钱梅双
辛海亚
梁起
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Gree Electric Appliances Inc of Zhuhai
Hefei Jing Hong Electrical Co Ltd
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Gree Electric Appliances Inc of Zhuhai
Hefei Jing Hong Electrical Co Ltd
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Priority to CN201911047991.8A priority Critical patent/CN110986456A/en
Publication of CN110986456A publication Critical patent/CN110986456A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/30—Quick freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/36—Visual displays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2600/00—Control issues
    • F25D2600/02—Timing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2600/00—Control issues
    • F25D2600/06—Controlling according to a predetermined profile
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Abstract

The invention relates to an instant freezing control method for refrigeration equipment and the refrigeration equipment. The instant freezing control method of the refrigeration equipment comprises a staged cooling and supercooling process, a supercooling removing process and a conventional refrigeration preservation process. In the sub-cooling and temperature-reducing process, the temperature of the cooled object is reduced in stages, the temperature reduction of each stage is realized by implementing cooling control on the instant freezing chamber, and each temperature-reducing stage of the sub-cooling and temperature-reducing process is provided with a preset accumulated working time of a compressor corresponding to the stage; the compressor is controlled to periodically operate in stages according to a preset accumulated operation time period. In the supercooling relieving process, the flow of the capillary group is reduced to implement supercooling relieving operation, so that the stored object stored in the instant freezing chamber is supercooled and then is instantly frozen (instant freezing for short), and the frozen stored object is stored at the conventional refrigeration storage temperature for a long time.

Description

Instant freezing control method for refrigeration equipment and refrigeration equipment
Technical Field
The invention relates to a refrigerating device instant freezing control method and a refrigerating device, 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.
At present, the supercooling control process is a difficult point, and how to perfect the control of the supercooling process and the better combination of the supercooling release process awaits further development and perfection of people, so as to obtain higher-quality supercooling cryopreservation.
Disclosure of Invention
In view of the above problems, the present invention provides a refrigeration apparatus and a transient freezing control method thereof that overcome or at least partially solve the above problems.
The invention relates to an instant freezing control method for refrigeration equipment and the refrigeration equipment. The instant freezing control method of the refrigeration equipment comprises a staged cooling and supercooling process, a supercooling removing process and a conventional refrigeration preservation process.
In the sub-cooling and temperature-reducing process, the temperature of the cooled object is reduced in stages, the temperature reduction of each stage is realized by implementing cooling control on the instant freezing chamber, and each temperature-reducing stage of the sub-cooling and temperature-reducing process is provided with a preset accumulated working time of a compressor corresponding to the stage; the compressor is controlled to periodically operate in stages according to a preset accumulated operation time period. In the supercooling relieving process, the flow of the capillary group is reduced to implement supercooling relieving operation, so that the stored object stored in the instant freezing chamber is supercooled and then is instantly frozen (instant freezing for short), and the frozen stored object is stored at the conventional refrigeration storage temperature for a long time.
Specifically, the method comprises the following steps:
the invention provides a refrigerating device, which comprises an instant freezing chamber with instant freezing function, a refrigerating system for providing instant freezing cold energy for the instant freezing chamber, and a control unit for controlling the refrigerating system to implement instant freezing storage on the instant freezing chamber, wherein the control unit comprises a controller and a timer, and is characterized in that: refrigeration plant still is provided with the capillary group, the control unit is through controlling refrigerating system is to the room implementation cooling stage by stage supercooling process and supercooling remove the process to freezing in the twinkling of an eye, wherein:
the staged cooling process comprises m cooling stages, wherein m is more than or equal to 2 and is a natural number;
each cooling stage of the m stages is provided with a preset accumulated working time length of the compressor corresponding to the stage;
the compressor is controlled to periodically work stage by stage according to a preset accumulated working time; in each period, the compressor is controlled to be intermittently started and stopped according to a preset operation period;
when the compressor finishes the preset accumulated working time period in the nth stage to be
Figure BDA0002254598030000021
Then, automatically entering the (n + 1) th stage to carry out the next stage of cooling, and finishing the preset accumulated working time of the (n + 1) th stage
Figure BDA0002254598030000031
m is more than or equal to n and more than or equal to 1, and n is a natural number; preset cumulative working time of compressor at nth stage
Figure BDA0002254598030000032
tni represents the working time of the compressor in the ith working period of the nth stage; i is greater than or equal to 1 and is a natural number;
preset accumulated working time when the compressor completes the last mth stage
Figure BDA0002254598030000033
The instant freezing chamber enters into the supercooling relieving process;
supercooling release process: the flow rate of the capillary group is reduced to V2 flow rate from V1 flow rate in the process of cooling and supercooling by stages, V2< V1, and the capillary group keeps V2 flow rate for t time.
The invention provides a refrigerating equipment instant freezing control method, the refrigerating equipment is provided with an instant freezing chamber and a refrigerating system which can supply cold for the instant freezing chamber and is provided with a compressor, and the refrigerating equipment instant freezing control method is characterized in that:
controlling the refrigerating system to carry out the following staged cooling and supercooling process and supercooling release process on the instant freezing chamber:
the staged cooling process comprises m cooling stages, wherein m is more than or equal to 2 and is a natural number; each cooling stage of the m stages is provided with a preset accumulated working time length of the compressor corresponding to the stage; controlling the compressor to work stage by stage according to the preset accumulated working time of each stage; in each cooling stage, controlling the compressor to work intermittently and calculating the working time of the compressor; the preset cumulative working time of the compressor at the nth stage is recorded as
Figure BDA0002254598030000034
Wherein t isni represents the working time of the compressor starting at the ith time in the nth stage; i is greater than or equal to 1 and is a natural number;
when the compressor completes the preset accumulated working time in the nth stage
Figure BDA0002254598030000035
Then, automatically entering the (n + 1) th stage, cooling the next stage, and finishing the preset accumulated working time of the (n + 1) th stage
Figure BDA0002254598030000036
m is more than or equal to n and more than or equal to 1, and n is a natural number;
until the last mth stage cooling and the corresponding preset accumulated working time of the mth stage are completed
Figure BDA0002254598030000037
Supercooling release process: the refrigerating equipment is also provided with a capillary group, the flow rate of the capillary group is reduced from V1 flow rate in the staged cooling and supercooling process to V2 flow rate, V2< V1, and the capillary group keeps V2 flow rate for t time.
The invention provides a refrigerating equipment instant freezing control method, the refrigerating equipment is provided with an instant freezing chamber and a refrigerating system which supplies cold for the instant freezing chamber and is provided with a compressor, and the refrigerating equipment instant freezing control method is characterized in that: controlling the refrigerating system to implement a transient freezing storage process provided with a staged cooling and supercooling process and a supercooling release process on the transient freezing chamber, wherein:
the staged cooling process comprises m cooling stages, wherein m is more than or equal to 2 and is a natural number;
each cooling stage of the m stages is provided with a preset stage cooling duration;
in the cooling time length of each preset stage, the compressor is controlled to start and stop in a preset single starting time length, a preset running period and a preset accumulated working time length;
when the compressor works in the nth stage, the preset operation period is tni', preset accumulated working time period of
Figure BDA0002254598030000041
n represents any natural number from 1 to m, n is more than or equal to 1 and less than or equal to m; t is tni represents the preset single start-up time of the compressor in the ith working cycle of the nth stage,
Figure BDA0002254598030000042
and is a natural number;
thus, the compressor is controlled according to the preset stage cooling time length, the preset operation period, the preset single starting time length and the preset accumulated time lengthThe working time length is periodically worked stage by stage until the preset accumulated working time length of the last mth stage is completed
Figure BDA0002254598030000043
Then entering the supercooling relieving process;
supercooling release process: the refrigerating equipment is also provided with a capillary group, the flow rate of the capillary group is reduced from V1 flow rate in the staged cooling and supercooling process to V2 flow rate, V2< V1, and the capillary group keeps V2 flow rate for t time.
Preferably, the compressor is cooled down and the corresponding preset accumulated working time is prolonged when the last mth stage of the compressor is finished
Figure BDA0002254598030000044
Then, entering into a supercooling relieving process; and entering a conventional refrigeration preservation process after the supercooling removing process reaches the preset supercooling removing time.
The invention provides a refrigerating equipment instant freezing control method, the refrigerating equipment is provided with an instant freezing chamber and a refrigerating system which supplies cold for the instant freezing chamber and is provided with a compressor, and the refrigerating equipment instant freezing control method is characterized in that: in implementing the control of the flash freezing chamber comprising:
s0: starting a instant freezing storage mode;
s1: carrying out a staged cooling process on the stored substances in the instant freezing chamber;
s2: performing a supercooling release process on the contents stored in the instant freezing chamber;
s3: performing a conventional refrigeration preservation process on the storage in the instant freezing chamber;
in the S1 process, m cooling stages are carried out stage by stage, and the working time of the compressor is timed in each stage;
when the compressor finishes the preset accumulated working time period in the nth stage to be
Figure BDA0002254598030000051
Then, automatically entering the (n + 1) th stage to carry out the next stage of cooling, and finishing the preset accumulated working time of the (n + 1) th stage
Figure BDA0002254598030000052
Wherein m is more than or equal to n and more than or equal to 1; m and n are natural numbers; t is tni represents the working time of the compressor in the ith working period of the nth stage; i is more than or equal to 1, and i is a natural number; preset cumulative working time of compressor at nth stage
Figure BDA0002254598030000053
Preset accumulated working time when the compressor completes the last mth stage
Figure BDA0002254598030000054
Then, the process proceeds to supercooling release process S2;
wherein the S3 supercooling release process: the refrigerating equipment is also provided with a capillary group, the flow rate of the capillary group is reduced from V1 flow rate in the staged cooling and supercooling process to V2 flow rate, V2< V1, and the capillary group keeps V2 flow rate for t time;
the supercooling release process S2 is timed, and when the preset supercooling release process time period is reached, the conventional refrigeration storing process S3 is performed.
Preferably, the duty ratio of the compressor in the 1 st cooling stage of the staged cooling process is controlled to be maximum, and the accumulated working time of the compressor is controlled to be maximum
Figure BDA0002254598030000061
The longest length; and in the 1 st temperature reduction stage, the temperature of the storage materials in the instant freezing chamber is reduced to 5 ℃ to-1 ℃.
Preferably, the staged cooling process includes at least 3 stages, and from stage 2, the duty cycle of stage n +1 of the compressor is greater than that of stage n, i.e. n +1>N; the preset single starting time t of the preset operation cycle of the compressor at the n +1 th stagen+1i is greater than the preset single starting time t of the preset operation cycle of the nth stageni, namely: t is tn+1i>tni; the staged temperature reduction and supercooling process reduces the temperature of the storage materials in the instant freezing chamber to-2 ℃ to-6 ℃.
Preferably, after the operation of the supercooling release process is completed, a conventional refrigeration preservation process is performed; in the conventional refrigeration preservation process, the temperature of the storage object in the instant freezing chamber is maintained at a preset temperature Tc, wherein Tc is more than or equal to minus 7 ℃ and less than 0 ℃;
preferably, 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，TONc>Tc>TOFFc；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, the set of capillaries operates at a V1 flow rate into the conventional cryopreservation process.
Preferably, the refrigeration equipment is also provided with a freezing fan, an instant freezing chamber air door and a condenser fan; the working parameters of the condenser fan, the capillary group, the freezing fan and the instantaneous freezing chamber air door are controlled and kept unchanged in the process of cooling by stages.
Preferably, the working parameters of a condenser fan, a capillary tube group, a freezing fan and a compressor in the refrigeration system are controlled and kept unchanged in the conventional refrigeration preservation process.
The invention also provides refrigeration equipment which is provided with the instant freezing chamber with the instant freezing function and can be used for realizing the instant freezing control method of any refrigeration equipment.
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(a) is a schematic diagram of a normal freezing and freezing curve of water according to an embodiment of the present invention;
FIG. 1(b) is a schematic diagram of the freezing curve of water in an embodiment of the present invention in the process of supercooling freezing;
FIG. 1(c) is a schematic diagram of the process of ice crystal growth in the supercooling freezing process of water according to the embodiment of the invention;
FIG. 2 is a schematic view of a refrigerator according to an embodiment of the present invention;
FIG. 3 is a diagram of a refrigeration system according to an embodiment of the present invention;
FIG. 4 is a refrigerant flow diagram of an embodiment of the present invention;
FIG. 5 is a schematic diagram of a refrigerator control unit according to an embodiment of the present invention;
FIG. 6 is a diagram of logic control in an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an instant freezing chamber in an embodiment of the present invention;
in the figure:
refrigerator-100; a refrigerating chamber-11; instant freezing chamber-12; freezing chamber-13; a flash freezing storage area box-120 refrigeration system-200; 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; a capillary group-270; capillaries 1-271; capillary 2-272; an electrically operated switching valve-28;
a control unit-30; a controller-31; a display-32; a temperature sensor-33; a temperature regulating device-34; -35 infrared sensor; a frequency conversion plate-36; timer-37; a condenser fan-38;
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.
[ introduction to the background of the invention for instant freezer storage ]
The storage object of the invention comprises the following storage objects: such as meat storage, seafood, fresh fruit and vegetable storage, cake/cold food, bread storage, and edible product such as beverage, wine, storage additive, etc.; in addition, cadavers requiring flash freezing are also contemplated.
In general, a refrigerating apparatus for storing stored materials including stored materials such as fish and meat is an apparatus for reducing the internal temperature of a closed instant freezer to a temperature lower than the external temperature and storing the stored materials for a long period of time by a low-temperature freezing method.
The frozen storage quality of the stored product is excellent, and the shape, size and distribution state of ice crystals generated during freezing are greatly influenced. For example, in the slow freezing of meat, ice crystals are generated outside myocytes with low solution concentration, the number of crystal nuclei is small, the ice crystals grow up to damage cell membranes, so that the cells are broken, meanwhile, water of the myocytes penetrates through the cell membranes to form the ice crystals, the myocytes are dehydrated and atrophied, and the cells cannot be completely restored to the original state during thawing, so that the delicate flavor is lost. Therefore, when the stored material is thawed, particularly when the stored material such as meat or fish is thawed, the flavor substance is lost and the taste thereof is deteriorated.
In order to solve such a problem, the present application proposes a technique of controlling the temperature of the flash freezing chamber using the supercooled state to supercool the stored material.
The supercooled state means that the stored material does not change its phase state even when it has reached a freezing point or less. The term "supercooling freezing (or instant freezing)" refers to a freezing and preserving mode (different from the conventional freezing and preserving mode) in which a supercooled state is achieved.
The difference between instant freezing (or supercooling freezing) and quick freezing is that the stored goods are re-frozen after being in a supercooling state; ensuring that the stored goods enter into the supercooling state and keeping the supercooling unfrozen state for enough time to ensure the supercooling is sufficient; at the same time, it must ensure that the temperature of the stored material in the supercooled state is low, i.e. that the stored material has a sufficiently large supercooling degree.
The supercooling degree means a difference between a freezing point of the stored material and a lowest supercooling temperature. The degree of subcooling depends on the freezing point of the stored product and the minimum temperature of subcooling.
The supercooling minimum temperature means a minimum temperature at which the stored material maintains a supercooled state.
The freezing point is a temperature point at which water in the stored material changes from a liquid state to a solid state, that is, a temperature at which ice crystals of the stored material begin to appear. For example, pure water has a freezing point of 0 ℃ and is in a supercooled state, in which water is cooled to 0 ℃ below the freezing point, and is still in a liquid state and does not freeze. However, most foods contain components that affect freezing, such as inorganic salts, sugars, or other organic acids, and the liquid in the stock is not pure water but a solution containing a solute, and the vapor pressure of the solution is lowered by the solute in the solution, so that the freezing temperature of the stock is lower than the freezing point of water, 0 ℃ (raoult's law).
Different storage object types have certain differences in freezing points, but most of the storage object types are between-1 ℃ and-5 ℃, and common storage object freezing points are listed as follows:
beef: -1.6 ℃ to 2.2 ℃;
pork: -2.0 ℃; fish: -2.2 ℃;
egg: -2.8 ℃; milk: -0.6 ℃;
grape: -3.5 ℃; apple: -2.0 ℃;
when the instant freezing chamber is controlled, if only one type of storage object is stored in the instant freezing chamber, the freezing point of the storage object is only needed to be considered, if the instant freezing chamber is not finely divided and can be used for storing multiple types of storage objects, the common range of the freezing point of different types of storage objects is considered, and a certain control margin is reserved. Most of the frozen stock stored in refrigerators is mainly meat, and the freezing point of meat is usually about-2 c, and accordingly, the freezing point temperature of meat can be set to about-2 c.
At present, the industry has common recognition, and the refrigeration quality of the supercooling refrigeration technology (or called instant freezing technology) is greatly improved due to the supercooling state in the refrigeration process.
[ further analysis of the phase change of the stored product during supercooling freezing with pure water as an example ]
Taking water as an example, fig. 1(a) shows a common freezing and freezing curve, i.e. a freezing and freezing curve without supercooling, and fig. 1(b) and fig. 1(c) show a freezing curve with a supercooling freezing process and five states experienced by a supercooling freezing and storing process (i.e. an instant freezing and storing process), wherein the five states are as follows: (1) unfrozen state: the temperature of the stored material is above the freezing point of the stored material.
(2) The supercooling state: the temperature of the stored matter is below the freezing point of the stored matter and is not frozen.
(3) Instantaneous temperature rise state after supercooling release: the temperature of the stored material is raised from the temperature below the freezing point to the temperature-raising state of the freezing point.
(4) Freezing start-freezing completion state: the phase change of the stored substance (in case of water, from liquid water to solid ice) occurs when the stored substance reaches the freezing point, and the stored substance (i.e. water) is maintained at the freezing point temperature in the process of completely freezing from the liquid state to the solid state.
(5) Freezing completion and frozen storage state: after the stored object is frozen through the process of (4), the stored object is continuously reduced from the freezing point temperature under the condition of continuously supplying cold from the outside, and finally, the stored object is frozen and stored for a long time at a temperature lower than the freezing point.
As can be seen from fig. 1(a), 1(b) and 1(c) combined with the principle of normal freezing and supercooling freezing, the normal freezing in fig. 1(a) will slowly begin to freeze from the surface of the product as time goes up, and the resulting ice crystals have large volume and are sharp like needles, which not only damages microbial cells, but also damages cells of fresh storage products such as fresh meat, fruits and vegetables, etc., and thus degrades the quality of the products. In contrast, in fig. 1(b) and 1(c), the water is supercooled and frozen, and after the supercooled state is released, the water starts to freeze, and from fig. 1(c), the growth and change process of ice crystals in the freezing process of the water after the supercooled state can be seen. From the graph of FIG. 1(c), we can conclude that: the cooling process can inhibit the generation of needle-shaped ice crystals in the water-containing storage material during storage, the formed ice crystals are mostly filled into elliptical particles, the size is smaller and more uniform, and the needle-shaped ice crystals are different from the needle-shaped ice crystals generated by common freezing, so that the needle-shaped ice crystals can be prevented from damaging cells during the common freezing process, the outflow of cell juice is reduced, the flavor substances of the storage material are stored, and the fresh-keeping effect of the storage material is improved.
The specific instant freezing process example is as follows:
s1: the staged cooling process refers to a process of cooling the stored material from a temperature higher than the freezing point to a temperature lower than the freezing point while keeping the stored material not frozen. The greatest advantage of freezing the stored product by supercooling freezing is that good quality freezing can be obtained. In the process of entering the supercooled state and being in the supercooled state,
the inside of the storage is also sufficiently cooled, so that uniform ice nuclei are formed throughout the storage and grown into small granular ice crystals. Further, the greater the difference between the minimum temperature reached in the supercooled state and the freezing point, the greater the number of ice nuclei formed at the start of freezing.
In order to form finer ice crystals and better freezing quality, the present invention preferably adopts a sub-cooling process (fig. 1(c) is a process of a0 → a1 → a 2).
In the first stage (A0 → A1) of the initial temperature of the stored object is higher, and the temperature of the stored object is reduced very quickly because of a larger temperature difference from the lowest supercooling temperature, and the stage is a pre-cooling stage, and the refrigeration system is controlled to provide larger cold quantity to the instant freezing chamber compared with other cooling stages so as to meet the requirement of quickly cooling the stored object. Because the initial temperature of the stored object is higher in the freezing process of the frozen stored object, larger cold energy is needed, and the surface temperature is rapidly reduced when the temperature is reduced and cooled at the beginning, if the cold energy supply can not adapt to the temperature reduction speed of the stored object, the central temperature of the frozen stored object is limited by slow heat transfer reduction, the whole temperature of the frozen stored object is uneven, and further the frozen stored object is difficult to enter the supercooling state, and the skin cracking phenomenon is also generated. Therefore, it is preferable that the first-stage cooling lowers the temperature of the whole of the frozen storage by a relatively large amount of cold to a temperature T1 a little higher than the freezing point, so as to facilitate the supercooling. Since the frozen stock stored in the refrigerator is mainly meat, the freezing point of the meat is generally-2 ℃, and accordingly, T1 may be set to about 10 ℃ to-1 ℃.
Preferably, the closer to the lowest supercooling threshold value, the smaller the cooling speed is controlled, so as to avoid accidental supercooling release caused by airflow disturbance and temperature disturbance. In order to ensure more sufficient supercooling time and stably cool to a supercooling minimum temperature threshold (also called supercooling minimum temperature or supercooling minimum temperature), the segmented temperature-reducing supercooling process at least comprises 2 stages, preferably more than 3 stages, such as 6 stages, so that the supercooling process is smoothly cooled to the cooling minimum threshold as much as possible, but the first stage is used as an initial stage, the initial temperature of food is higher, more cold energy supply is needed, and the preferable temperature-reducing speed is the maximum to reduce the temperature difference between the inside and the outside of the food as much as possible, so that the skin cracking phenomenon is generated.
Further preferably, the temperature of the surface of the stored object is reduced from 3 ℃ to 0 ℃; the temperature difference of the air around the stored object is below 2 ℃, and the temperature difference between the surface and the center of the food is below 2 ℃, so that the supercooled state is more favorably entered and the supercooled state with enough supercooling degree is maintained.
S2: the supercooling release process is a freezing process of the stored object from supercooling release to full freezing of the stored object due to the supercooling stimulus, namely an a → B → C process, wherein the a → B process is a temperature rise process of the stored object instantly rising to a freezing point after the supercooling release operation is executed, a state point B is a starting point of the stored object starting to freeze, and a state point C is a finishing point of the stored object full freezing; the process B → C is the phase state change process from complete unfreezing to complete freezing of the stored material after the supercooling release operation, the solid-liquid coexisting state exists between the process B → C, and the rounded ice crystal microparticles are uniformly distributed in food cells (stored materials), so that cell walls can not be punctured, the food is not deteriorated, and the loss of nutrition is avoided. In practice, the shorter the time the process is, the better the process is to break through the largest ice crystal band quickly.
The supercooled state is an unstable state, and a certain stimulus is required to release the supercooled state, and such a stimulus may be a temperature factor or a physical factor. The supercooled state is an unstable state, and a certain stimulus is required to release the supercooled state, and such a stimulus may be a temperature factor or a physical factor. The supercooling state can be relieved through adjusting the temperature and the amount of cold air in the temperature aspect. The physical aspect may be released by applying an electric field, a magnetic field, physical vibration, microwaves, or the like to the stored object. The supercooling relieving process is a stored object supercooling process for relieving supercooling by stimulation, and in the process, the stored object can be instantly heated to the freezing point temperature of the stored object, and ice nuclei are rapidly formed to be frozen until the stored object is completely frozen.
Specifically, the means for applying the external stimulus to the stored substance in the supercooled state in the flash chamber may be temperature-related or physical. The external stimulus may be generated by a device related to cooling in the refrigeration system, may be generated by a separately provided supercooling release device, or may be generated by a combination of them. Thus, an electric field and/or a magnetic field and/or mechanical oscillation may be applied to the flash chamber to address the subcooling process, one or more of these means may be coordinated with the refrigeration fan and/or condenser fan and/or compressor and/or capillary tube bank and/or flash chamber damper of the refrigeration system, and the subcooling release may be achieved by simply controlling the refrigeration fan and/or condenser fan and/or compressor and/or capillary tube bank and/or flash chamber cooling air door of the refrigeration system.
Preferably, the supercooling release by the temperature stimulation may be an increase in the freezing fan speed of the refrigeration system and/or an increase in the condenser fan speed and/or an increase in the compressor speed and/or a decrease in the capillary tube group flow and/or an increase in the flash chamber air supply. Further preferably, the rotation speed of the freezing fan and/or the rotation speed of the condenser fan and/or the rotation speed of the compressor and/or the flow rate of the capillary tube group and/or the air supply quantity of the instant freezing chamber can be adjusted to correspond to the maximum refrigerating capacity of the refrigerating system or the maximum refrigerating capacity provided for the instant freezing chamber. In the first stage of staged temperature reduction, the temperature of the stored object is higher, the temperature difference with the instant freezing chamber is larger, and larger cooling capacity is provided for the instant freezing chamber, so that the rapid temperature reduction in the precooling stage is facilitated, and the internal and external temperatures of the stored object are consistent as soon as possible to stably enter the supercooling state. When supercooling is relieved, the instant freezing chamber is provided with relatively large cooling capacity, so that supercooling can be relieved efficiently, and the stored objects can break through the largest ice crystal band to form the frozen object.
Preferably, the electric field for removing supercooling may be an electrostatic field or an alternating electric field, and may be a high-voltage electrostatic field or a low-voltage electrostatic field depending on the electric field intensity; the irradiation frequency can be low-frequency electric field or high-frequency electric field, and the irradiation frequency can be sinusoidal waveform or non-sinusoidal waveform, such as pulse square wave, according to the waveform. We have found that different electric field types, different electric field intensities, and different electric field frequencies and voltage waveforms play different roles in different stages of the whole supercooling process, and if we can apply different electric field types and/or different electric field intensities and/or different electric field frequencies in different instant freezing processes when an energy device is used for applying stimuli for relieving supercooling, the instant freezing process can not only obtain the ice crystal state for improving the microstructure of the muscle fiber bundles and tenderizing meat quality, but also obtain more comprehensive technical effects in the aspects of keeping the flavor, nutrition, color and luster of food and the energy consumption of a refrigerator.
It is further noted that whatever cooling is used, the zone of maximum ice crystal formation (typically-1 ℃ to-5 ℃) in a short time contributes to the formation of finer ice crystals and counteracts other adverse effects that lead to larger ice crystals and reduced frozen quality of the stock. Therefore, we propose that during the supercooling release phase of the stored material, it is still preferable to completely freeze the stored material quickly, i.e. the process B → C in fig. 1(C) is completed in a shorter time, which not only reduces the time consumption of the whole supercooling-freezing process, but also ensures the supercooling-freezing effect. In other words, in the supercooling release stage, no matter what releasing means is adopted, the refrigerating device keeps high refrigerating capacity in the supercooling release process, so that the instant freezing chamber can quickly reach the state C from the state B point, and the freezing process from incomplete freezing to complete freezing is very beneficial.
S3: the conventional refrigeration preservation process refers to the refrigeration preservation process after the stored substance is frozen. In the process, as the stored object is normally stored after the supercooled state is completely frozen, if a conventional freezing means is adopted to maintain the stored object within a preset temperature range at the stage, for example, the conventional refrigeration storage process can be realized by controlling a freezing air door and/or a compressor to be started and stopped periodically. In the embodiment, the final preservation temperature in the conventional refrigeration preservation process is preferably controlled within the range of-5 ℃ to-18 ℃ by starting and stopping the air door of the instant freezing chamber.
However, we have surprisingly discovered that, theoretically, the storage is already fully frozen at the C-state point. But at this time, the formation of ice crystals has not yet completely reached a stable state, and the ice crystals still have certain capacity of solidifying small ice crystals into large ice crystals, and the temperature point is generally 0-5 ℃ lower than the freezing point. In this case, if the instant freezing chamber is cooled with relatively high cooling intensity and cooling speed when the instant freezing process of the stored substance reaches the C state point, the obtained freezing effect is better than that of the instant freezing chamber immediately according to the conventional freezing preservation mode (also commonly referred to as the ordinary freezing mode) when the C state point is reached.
Preferably, the routine refrigeration preservation process of the embodiment controls the opening and closing process of the instant freezing chamber air door to be continuously and repeatedly carried out according to the preset temperature Tc:
(1) starting up the air door of the instant freezing chamber: t isONc＝Tc+TB1/2；
(2) The air door of the instant freezing chamber is closed at a working point: t isoffc＝TONc-TB2/2；
Tc is a preset reference temperature for conventional refrigeration preservation;
TB1indicating the floating temperature of a starting point of a temperature variation chamber in the starting process of a compressor;
TB2indicating the temperature difference between start and stop of the temperature-changing chamber; t isONc>Tc>Toffc。
Preferably, TB1The value range of (A) is 0 DEG C<TB1≤2℃，TB2The value range of (A) is 0 DEG C<TB2≤2℃。
As mentioned above, even if we are able to accelerate the freezing speed of the maximum ice crystal temperature zone even though it is over-cooled, the probability of ice crystals becoming larger is lower, and it is more advantageous to offset other causes of the degradation of the frozen quality of the stored product, and to achieve better quality freezing.
Based on this, the conventional cryopreservation process of this embodiment is preferable not to immediately stop the supercooling release operation when the freezing process reaches the state point C as shown in fig. 1(C), and to delay the temperature reduction of the stored material from the state point B to Toffc＝TONc-TB2And/2, controlling the opening and closing process of the compressor or the instant freezing chamber air door to reciprocate continuously according to the preset temperature Tc. On one hand, the ice crystals can be prevented from being connected to form large ice crystals, and on the other hand, the phenomenon that the supercooling freezing quality is reduced because the central temperature of the storage object does not exceed the maximum ice crystal band due to inaccurate temperature monitoring or asynchronous temperature reduction inside and outside the storage object is avoided.
The accurate control of the supercooling process ensures that stored objects are fully supercooled but also ensures that the stored objects are quickly frozen after the supercooling is removed, and is an important guarantee for improving the supercooling freezing quality, avoiding the freezing time process and reducing the energy consumption of the refrigerator.
However, the difficulty of temperature monitoring of the prior refrigerating device is difficult to control the temperature of the instant freezing chamber according to the supercooling temperature condition of the stored object, and particularly difficult to uniformly maintain the temperature distribution in the instant freezing chamber, aiming at the problem, the invention arranges the instant freezing chamber in the refrigerator, controls the refrigerating system to respectively carry out staged supercooling cooling, supercooling release process and conventional refrigerating and storing process through the control system, and simultaneously combines the start-stop control of the compressor and the accumulated working time control of the compressor, thereby not only ensuring the stable and uniform completion of the supercooling cooling process, but also realizing the high-efficiency supercooling release, enabling the freezing process of the stored object to be quicker, the ice crystal to be finer and more round, and easily realizing knife cutting without unfreezing; meanwhile, the damage of cells of the object to be frozen is avoided, the loss of nutrient substances in the freezing and unfreezing processes is reduced, and the problems of overlong instant freezing process and overlarge energy consumption of refrigeration equipment are avoided.
Example 1: refrigerating apparatus integral constitution and corresponding embodiment of instant freezing method
Examples 1 to 1: integral construction of refrigerating apparatus ]
Fig. 2 is a schematic diagram of a refrigerator, which is a refrigeration device with instant freezing function according to an embodiment of the present invention, the refrigeration device can be a generally recognized refrigerator, an ice chest, a cold storage, etc. with a refrigeration function, and the present embodiment is exemplified by a refrigerator. Specifically, the refrigerator may include an outer case, an inner container disposed inside the outer case, and an insulation material filled between the outer case and the inner container. The inner container defines a cooling chamber for storing the object to be cooled, and the cooling chamber comprises an instant freezing chamber 12 which can be used for realizing instant freezing function, wherein the instant freezing function can be an instant freezing chamber with single instant freezing function or an instant freezing chamber capable of being converted with common freezing or refrigerating function. The refrigerator in this embodiment further includes a refrigerating compartment 11 and a freezing compartment 13. In addition, the instant freezing chamber can be provided with a storage drawer so as to form a more closed storage space, and can also be arranged into a shelf type so as to form more uniform cold airflow in the instant freezing chamber so as to ensure uniform temperature and uniform cooling of stored objects. A door body for opening or closing the instant freezing chamber can be arranged at the front opening of the instant freezing chamber,
the door body can be a sliding door capable of being pushed and pulled left and right/up and down, and can also be a split door or a single door. Further, the refrigerator may further include ordinary freezing and refrigerating functions and other instant freezing chambers such as a refrigerating chamber and a freezing chamber for performing the functions. As shown in fig. 2, in the refrigerator according to the embodiment of the present invention, it is preferable that a refrigerating chamber 11 is disposed above an instant freezing chamber, a freezing chamber 13 is disposed below the instant freezing chamber, and the instant freezing chamber is disposed between the refrigerating chamber and the freezing chamber to prevent the smell tainting problem of the refrigerator due to the rising of hot air.
The instant freezing chamber can be used for storing various foods or specially used for certain or certain foods, so that the control precision of the instant freezing function and the freezing quality are improved.
The item to be frozen in this embodiment may be a food product, particularly meat, which requires frozen storage.
The cold required for storing the goods to be frozen comes from the refrigeration system. The refrigerator in embodiments of the invention includes a refrigeration system (not shown) that can be configured to be controlled to provide refrigeration to the flash freezing chamber, but can of course be controlled to provide refrigeration to other chambers.
Fig. 3 shows a refrigeration system 200 for supplying cold in the instant freezing process of the refrigeration apparatus according to the present invention. The refrigeration system comprises a compressor 23, a condenser 24, a throttling device (such as a capillary tube group) 270, a refrigeration part such as a refrigeration evaporator 21 and the like, which are sequentially connected by pipelines as shown in figure 3 to form a closed system, wherein refrigerant continuously circulates in the system, changes state and exchanges heat with the outside. When the refrigerating system works, the evaporator continuously absorbs the heat of stored objects, the low-temperature low-pressure liquid state is converted into low-temperature low-pressure gas, the compressor sucks working medium steam with lower pressure from the evaporator, the steam with lower pressure is compressed into steam with higher pressure, the refrigerant steam with raised pressure is sent into the condenser, the refrigerant steam is condensed into liquid with higher pressure in the condenser, the liquid with higher pressure is throttled by the capillary tube group and is returned into the evaporator after becoming liquid with lower pressure, the liquid with lower pressure is sent back into the evaporator, the heat is absorbed in the evaporator and is evaporated into steam with lower pressure, and the steam is sent into the inlet of the compressor, so that the continuously circulating reciprocating phase state change and the refrigerating cycle are completed. Preferably, the present embodiment further provides a return air pipeline assembly 220 and a return air heat exchange section 221.
The supercooling performance of the refrigeration equipment is further improved. Further preferably, the refrigerant condenser further comprises a condensation preventing pipe 25 and a dry filter 26, so as to ensure that the refrigerant is not blocked by ice when the capillary tube is throttled.
As shown in fig. 4, the refrigerant flow direction when operating with the preferred embodiment of the refrigeration system described above is: compressor 23 → condenser 24 → anti-condensation tube 25 → dry filter 26 → electric switching valve 28 → capillary tube group 270 (capillaries 1-271 or capillaries 2-272) → freeze evaporator 21 → muffler group 220 → compressor 23.
Preferably, the condenser 24 of this embodiment is further provided with a condenser fan 38 for enhancing the heat release from the condensation.
The throttling device in this embodiment employs a capillary group 270, and the switching of the capillary group and the adjustment of the overall throttling amount can be controlled by a control valve such as a three-way valve, an electric directional valve, an electric switching valve, or the like. In this embodiment, a flow path control valve, that is, the electric switching valve 28 in fig. 4 and 3 is provided in the capillary group 270 to adjust the flow rate of the capillary group. The capillary group is formed by combining capillaries with different pipe diameters, and the smaller the pipe diameter of the capillary is, the stronger the throttling is. The flow path control valve can adjust the flow rate of the capillary group. In the present series of invention applications, two capillaries having different specifications are provided in the refrigeration system: capillary 1-271 and capillary 2-272, when relieving the overcooling process the flow of the capillary group is reduced, can reduce the temperature of the cold air, increase the cooling capacity to the thing stored in the instant freezing chamber, relieve overcooling. When the cold supply capacity of the instant freezing chamber is adjusted only by changing the flow rate of the capillary group, the flow rate of the capillary group reaches the minimum value capable of maintaining the normal operation of the refrigerating system, and then the cold supply capacity is maximum.
Preferably, an air duct is further formed in the refrigerator of the present embodiment, and the freezing fan supplies cold air cooled and dehumidified by the evaporator to the instant freezing chamber through the air duct to achieve instant freezing of the food stored in the instant freezing chamber. The air duct is communicated with an air inlet of the instant freezing chamber, and the air inlet is provided with an instant freezing chamber air door and a freezing fan for providing power for cold air to enter the instant freezing chamber. The temperature of the instant freezing chamber can be adjusted by periodically opening and closing the air door of the instant freezing chamber. The freezing fan and the instantaneous freezing chamber air door are opened and closed according to requirements and the air quantity is adjusted.
As shown in fig. 5, to realize the instant freezing function of the above-described refrigeration apparatus, the present embodiment also provides a control unit 30 for performing instant freezing control, the control unit including: the controller 31 is in control connection with the display 32, the temperature sensor 33, the temperature adjusting device 34, the infrared sensor 35, the frequency conversion plate 36, the timer 37, the condenser fan 38 and the electric switching valve 28 respectively. The timer 37 times the preset shutdown time length of the working time length of each section of the compressor, the controller 31 starts or stops the compressor or controls the rotating speed further according to the preset stage and the preset time, and when the rotating speed control is needed, the frequency conversion board 36 sends a compressor rotating speed adjusting instruction to adjust the rotating speed of the compressor 23. It needs to be further explained that: the frequency conversion plate in the embodiment is only one example of the compressor speed adjusting device, and the frequency conversion plate is not understood to be the only means and necessary means for adjusting the compressor speed in the invention.
Further, the user may select the flash freezing function through the display 32, and when the user selects the flash freezing function, the control system performs the flash freezing chamber control method. Further, the control unit may also adjust the temperature of the instant freezing chamber by using the temperature adjusting device 34 according to one or more parameters of the ambient temperature, the kind of the stored object, the initial temperature, the weight, the volume and the like, thereby adjusting the number of the preset cooling stages, the multi-stage cooling duration and the accumulated working time of the compressor. Of course, this is not a necessary condition for implementing the present invention, and the instant freezing function is started in the controller directly according to the preset steps according to the preset type of the storage object in the instant freezing chamber, the maximum storage capacity and the maximum refrigeration load of the instant freezing chamber, the temperature reduction period in the pre-cooling stage and each stage, the accumulated working period of the compressor and the duty ratio.
Further, in order to ensure the reliability of the operation control of each stage of the instant freezing process, the present invention does not exclude the arrangement of a temperature sensor 33 such as a thermistor for detecting the temperature of the instant freezing chamber and transmitting the temperature information of the instant freezing chamber to the controller 31, and the arrangement of a non-contact infrared sensor 35 for monitoring the temperature of the stored material and transmitting the temperature information of the stored material to the controller 31 for assisting the controller in controlling the processes of each stage of the process according to the timer.
The following gives an example of a specific control method of the present invention using the above-mentioned embodiment of the refrigeration equipment, which not only can make the supercooling process cool down uniformly, avoid the technical problems that the supercooling depth is shallow, the supercooling state cannot be well entered, and the supercooling is removed in advance (but this does not mean that the control equipment of the present invention must use the following control method, nor that the control method must use the refrigeration equipment constructed by the above-mentioned structure to implement.
Specifically, the control unit controls the refrigeration equipment to realize the instant freezing function according to the following implementation example, and mainly comprises three process stages, namely a staged cooling and supercooling process, a supercooling removing process and a conventional refrigeration storage process, wherein the supercooling cooling process adopts the staged cooling and supercooling process, and the staged cooling and supercooling process of the instant freezing chamber is controlled by controlling the accumulated working time and duty ratio of each stage of the compressor, specifically:
the staged cooling process comprises m cooling stages, wherein m is more than or equal to 2 and is a natural number;
each cooling stage of the m stages is provided with a preset accumulated working time of the compressor corresponding to the stage; the compressor is controlled to work stage by stage according to the preset accumulated working time of each stage;
in each cooling stage, controlling the compressor to work intermittently and calculating the working time of the compressor; the preset cumulative working time of the compressor at the nth stage is recorded as
Figure BDA0002254598030000211
Wherein t isni represents the working time of the compressor starting at the ith time in the nth stage; i is greater than or equal to 1 and is a natural number;
when the compressor finishes the preset accumulated working time in the nth stage
Figure BDA0002254598030000212
Then, automatically entering the (n + 1) th stage to carry out the next stage of temperature reduction until the preset accumulated working time of the last mth stage is finished
Figure BDA0002254598030000213
When the stored object is in the supercooling release process, the stored object is subjected to the supercooling release operation;
in order to improve the uniformity and control accuracy of the cooling of the stored objects in the multi-stage cooling process, the embodiment is further preferable, and a preset stage cooling duration is set in each cooling stage of the m stages; in each preset stage cooling time length, the compressor is controlled to start and stop in preset single starting time length, preset running period and preset accumulated working time length; namely, the compressor is periodically operated stage by stage according to the preset stage cooling time length, the preset operation period, the preset single starting time length and the preset accumulated working time length. If the compressor is operated in the nth stage, the preset operation period is tni', preset accumulated working time period of
Figure BDA0002254598030000214
n represents any natural number from 1 to m, n is more than or equal to 1 and less than or equal to m; t is tni represents the preset single starting time length of the ith working cycle of the compressor at the nth stage; preset accumulated working time of compressor working in nth stage
Figure BDA0002254598030000215
And is a natural number; i is more than or equal to 1 and is a natural number;
preferably, the intermittent operation of the compressor is periodic start and stop, the working period of the compressor in the nth stage is the sum of the start-up time and the stop time of the period, and the stop time of the period is defined as tni', i.e. the compressor duty cycle of the nth stage is: t is tni"＝tni+tni'。
The lowest supercooling temperature is the lowest temperature of the stored material in the supercooling process, the supercooling state close to the lowest temperature becomes more unstable, and in order to ensure the enough supercooling degree and the enough supercooling time, the control of the compressor is further optimized as follows: the closer the temperature of the instant freezing chamber approaches to the lowest supercooling temperature of the stored object, the larger the duty ratio of the compressor is, and the longer the preset accumulated working time is. I.e. at least from stage 2 of the compressor, the duty cycle of stage n +1 is greater than that of stage n, i.e. n +1>N, preset single starting time t of preset operation period of compressor at n +1 th stagen+1i is greater than the preset work week work time t of the nth stageni, namely: t is tn+1i>tni. Preferably, in the cooling stage 1, i.e. the pre-cooling stage, the compressor is controlled to adopt a larger compressor duty ratio and a preset accumulated working duration than in the stages 2 to m of the multi-stage cooling process, so as to better ensure the supercooling freezing effect, reduce the temperature of the stored object and avoid the surface cracking phenomenon. Still more preferably, the present embodiment controls the duty ratio of the cooling and subcooling process at the 1 st stage of the compressor to be not more than 1, and the cumulative operating time of the compressor
Figure BDA0002254598030000221
The longest.
In the cooling time length of each preset stage, the compressor is controlled to start and stop in a preset single starting time length, a preset running period and a preset accumulated working time length;
when the compressor works in the nth stage, the preset operation period is tni', presetting a single start time as tni, preset cumulative operating time period of
Figure BDA0002254598030000222
n represents any natural number from 1 to m, n is more than or equal to 1 and less than or equal to m; t is tni represents the preset single starting time length of the ith working cycle of the compressor at the nth stage; preset accumulated working timeLong and long
Figure BDA0002254598030000223
And is a natural number;
when the compressor finishes the preset accumulated working time in the nth stage
Figure BDA0002254598030000224
Then, automatically entering the (n + 1) th stage to carry out the next stage of cooling, and finishing the preset accumulated working time of the (n + 1) th stage
Figure BDA0002254598030000225
Thus, the compressor is controlled to periodically work stage by stage according to the preset stage cooling time length, the preset operation period, the preset single starting time length and the preset accumulated working time length until the preset accumulated working time length of the last mth stage is completed
Figure BDA0002254598030000226
Preset accumulated working time when the last mth stage is finished
Figure BDA0002254598030000231
Entering a supercooling relieving process; and entering a conventional storage stage when the supercooling removing process reaches the preset supercooling removing time.
Preferably, the compressor duty cycle of the stage 1 cooling/subcooling process of the staged cooling process is controlled1Cumulative operating time of compressor
Figure BDA0002254598030000232
The longest.
Preferably, the duty ratio of the n +1 stage of the compressor from the 2 nd stage of the staged cooling process is controlledn+1Duty cycle greater than compressor nth stage §nI.e. §n+1>§n(ii) a The preset single starting time t of the preset operation cycle of the compressor at the n +1 th stagen+1i is greater than the preset single starting time t of the preset operation cycle of the nth stageni，Namely: t is tn+1i>tni；
Preferably, the staged temperature reduction and supercooling process is controlled to reduce the temperature of the stored substance in the instant freezing chamber to-2 ℃ to-6 ℃, wherein the temperature reduction and supercooling process in the 1 st stage reduces the temperature of the stored substance in the instant freezing chamber to 5 ℃ to-1 ℃; the temperature is reduced to Tc in the conventional storage stage, and the value range of Tc is (0 ℃ and-7 ℃).
Examples 1 to 2: control process of instantaneous freezing control method for refrigeration equipment
Fig. 6 is a specific control logic diagram of the instant freezing control method of the refrigeration equipment in the embodiment, and the following describes in detail an embodiment of the instant freezing process control method of the instant freezing chamber in combination with fig. 6 and the aforementioned refrigeration equipment configuration embodiment.
S00: selective instant freezing storage function
The display is provided with a instant freezing selection key. When the user selects the instant freezing storage function on the display, the control unit controls the temperature of the instant freezing chamber in three process sections through the temperature adjusting device, namely a staged cooling and supercooling process, a supercooling release process and a conventional refrigeration storage process. Wherein in the embodiment, 7 temperature reduction stages are set in the staged temperature reduction and supercooling process.
S01: staged cooling and supercooling process
In the stage of supercooling and cooling, the control device is used for cooling the instant freezing chamber in stages, specifically, the control of the stage cooling process of the embodiment is as follows: presetting the cumulative working time of the compressor in the nth stage as
Figure BDA0002254598030000241
Presetting the single operation period of the compressor at the nth stage as tni', presetting the time length of one start of the compressor as tni, presetting the compressor single-stop time as tni'，tni"＝tni+tni'。
It should be further noted that, in the control method of this embodiment, the staged supercooling and cooling process is performed to control the stage staying time of each cooling stage, and the stage staying time of the nth cooling stage is set as tnIn the present embodiment, the stage staying time t of each stage in the staged cooling and supercooling processnSame value, tnThe value range of (1) is 0h < tnLess than or equal to 6 hours. And when the stage residence time of each stage is consistent, controlling the preset compressor single shutdown time in the nth cooling stage to be tni' are also all identical, tnThe value range of i' is more than or equal to t and is more than or equal to 18minni' is less than or equal to 22 min. Because the control method of the embodiment controls the stage stay time t of each stage in the staged cooling supercooling processnThe values are the same, and the single shutdown time of the compressor in the nth cooling stage is controlled to be tni' are also all identical; controlling preset compressor single starting time t in each cooling stageni is different, the cumulative working time of the compressor in the nth stage is
Figure BDA0002254598030000242
And also different. Namely, in the staged supercooling and cooling process, when the single startup time length t of the compressor is preset at a certain cooling stageni longer, cumulative operating time of the compressor at this stage
Figure BDA0002254598030000243
The longer.
Controlling the compressor in each cooling stage according to the stage retention time t in each cooling stage in the staged supercooling cooling processnAnd (5) operating. In the nth cooling stage, the compressor is started and stopped once to form an operation period, and the compressor is operated in a periodic starting and stopping state in the nth cooling stage until the accumulated time of the timer in the nth cooling stage reaches the stage retention time tnAnd if the instantaneous freezing chamber enters the (n + 1) th cooling stage, the periodic start-stop control of the (n + 1) th stage is also carried out on the compressor.
The control process of the concrete stage is as follows:
the method comprises the following steps: 1, cooling stage: controlling the compressor to operate at a rotating speed M1, the rotating speed of a condenser fan to be S1, the flow rate of the capillary group to be V1, and the compressor to operate at a preset single startup time length t 11 intoStarting up the machine, the timer is at t1Timing within 1 time, executing compressor shutdown after timing is finished, wherein the compressor shutdown time is preset single shutdown time t11'; the timer accumulates the compressor stop time to t11', executing the starting operation of the compressor, wherein the preset single starting time duration of the compressor is t12, starting up again, the time length of starting up after running is t12, continuing to execute the compressor shutdown after the startup work, wherein the compressor shutdown time is preset single shutdown time t12'; with the circulation, the timer simultaneously carries out the full-time timing, so that the compressor is started and stopped to periodically work for the stage retention time t1And then executing the step two. Wherein t is1The value range of i is t1 which is more than or equal to 12.8min and less than or equal to 13.2min
Step two: and 2, cooling stage: controlling the compressor to operate at a rotating speed M1, the rotating speed of a condenser fan to be S1, the flow rate of the capillary group to be V1, and the compressor to operate at a preset single startup time length t 21 starting up, the timer is at t2Timing within 1 time, executing compressor shutdown after timing is finished, wherein the compressor shutdown time is preset single shutdown time t21'; the timer accumulates the compressor stop time to t21', executing the starting operation of the compressor, wherein the preset single starting time duration of the compressor is t22, starting up again, the time length of starting up after running is t22, continuing to execute the compressor shutdown after the startup work, wherein the compressor shutdown time is preset single shutdown time t22'; with the circulation, the timer simultaneously carries out the full-time timing, so that the compressor is started and stopped to periodically work for the stage retention time t2And then executing a third step, namely a 3 rd cooling stage. Wherein t is2The value range of i is more than or equal to t and is 4.8min2i≤5.2min。
Step three: and 3, cooling stage: controlling the compressor to operate at a rotating speed M1, the rotating speed of a condenser fan to be S1, the flow rate of the capillary group to be V1, and the compressor to operate at a preset single startup time length t 31 starting up, the timer is at t3Timing within 1 time, executing compressor shutdown after timing is finished, wherein the compressor shutdown time is preset single shutdown time t31'; timer accumulationCompressor down time reaches t31', executing the starting operation of the compressor, wherein the preset single starting time duration of the compressor is t32, starting up again, the time length of starting up after running is t32, continuing to execute the compressor shutdown after the startup work, wherein the compressor shutdown time is preset single shutdown time t32'; with the circulation, the timer simultaneously carries out the full-time timing, so that the compressor is started and stopped to periodically work for the stage retention time t3And then executing a step four, namely a 4 th cooling stage. Wherein t is3The value range of i is more than or equal to t within 6.3min3i≤6.7min。
Step four: and 4, cooling stage: controlling the compressor to operate at a rotating speed M1, the rotating speed of a condenser fan to be S1, the flow rate of the capillary group to be V1, and the compressor to operate at a preset single startup time length t 41 starting up, the timer is at t4Timing within 1 time, executing compressor shutdown after timing is finished, wherein the compressor shutdown time is preset single shutdown time t41'; the timer accumulates the compressor stop time to t41', executing the starting operation of the compressor, wherein the preset single starting time duration of the compressor is t42, starting up again, the time length of starting up after running is t42, continuing to execute the compressor shutdown after the startup work, wherein the compressor shutdown time is preset single shutdown time t42'; with the circulation, the timer simultaneously carries out the full-time timing, so that the compressor is started and stopped to periodically work for the stage retention time t4And then executing a step five, namely a 5 th cooling stage. Wherein t is4The value range of i is more than or equal to t and less than or equal to 7.8min4i≤8.2min。
Step five: and 5, cooling stage: controlling the compressor to operate at a rotating speed M1, the rotating speed of a condenser fan to be S1, the flow rate of the capillary group to be V1, and the compressor to operate at a preset single startup time length t 51 starting up, the timer is at t5Timing within 1 time, executing compressor shutdown after timing is finished, wherein the compressor shutdown time is preset single shutdown time t51'; the timer accumulates the compressor stop time to t51', executing the starting operation of the compressor, wherein the preset single starting time duration of the compressor is t52 starting up againWorking, the time of starting up after running is t52, continuing to execute the compressor shutdown after the startup work, wherein the compressor shutdown time is preset single shutdown time t52'; with the circulation, the timer simultaneously carries out the full-time timing, so that the compressor is started and stopped to periodically work for the stage retention time t5And then executing a sixth step, namely a 6 th cooling stage. Wherein t is5The value range of i is more than or equal to t within 9.3min5i≤9.7min。
Step six: and 6, cooling stage: controlling the compressor to operate at a rotating speed M1, the rotating speed of a condenser fan to be S1, the flow rate of the capillary group to be V1, and the compressor to operate at a preset single startup time length t 61 starting up, the timer is at t6Timing within 1 time, executing compressor shutdown after timing is finished, wherein the compressor shutdown time is preset single shutdown time t61'; the timer accumulates the compressor stop time to t61', executing the starting operation of the compressor, wherein the preset single starting time duration of the compressor is t62, starting up again, the time length of starting up after running is t62, continuing to execute the compressor shutdown after the startup work, wherein the compressor shutdown time is preset single shutdown time t62'; with the circulation, the timer simultaneously carries out the full-time timing, so that the compressor is started and stopped to periodically work for the stage retention time t6And then executing a step seven, namely a 7 th cooling stage. Wherein t is6The value range of i is more than or equal to t and less than or equal to 10.8min6i≤11.2min。
Step seven: and 7, cooling stage: controlling the compressor to operate at a rotating speed M1, the rotating speed of a condenser fan to be S1, the flow rate of the capillary group to be V1, and the compressor to operate at a preset single startup time length t 71 starting up, the timer is at t7Timing within 1 time, executing compressor shutdown after timing is finished, wherein the compressor shutdown time is preset single shutdown time t71'; the timer accumulates the compressor stop time to t71', executing the starting operation of the compressor, wherein the preset single starting time duration of the compressor is t72, starting up again, the time length of starting up after running is t72, continuing to execute the compressor shutdown after the startup work, wherein the compressor shutdown time is preset single shutdown time t72'; with the circulation, the timer simultaneously carries out the full-time timing, so that the compressor is started and stopped to periodically work for the stage retention time t7And then step eight is executed. Wherein t is7The value range of i is t7 is more than or equal to 12.8min and less than or equal to 13.2 min.
It should be further explained that the ith startup time t in the nth cooling stage in this embodimentni is equal to each other, i is more than or equal to 1, and i is a natural number; in this embodiment, the ith shutdown time t in the nth cooling stageni' are all equal, i is more than or equal to 1, and i is a natural number.
S02: supercooling release process
The supercooling release process is also a process of instantly forming crystal nuclei and rapidly freezing completely after external stimulus is applied to the stored substance in the instant freezing chamber from the supercooled unfrozen state. The external stimulus applied to the contents of the flash chamber (typically food) may be from a temperature perspective or from a physical perspective, as long as the stored contents are broken into an equilibrium state of supercooling and unfreezing, thereby releasing the supercooled state.
The technical scheme of enabling the stored material to be supercooled is listed in detail below, and it is further explained that the supercooling release process can be realized by a single technical means or the cooperation of a plurality of technical means.
This embodiment removes subcooling in the subcooling removal stage using a reduced flow rate in the capillary array.
In this embodiment, a single means for increasing the amount of cooling is used to release the supercooling process. Specifically, the flow rate of the capillary group in the refrigeration system when entering the supercooling release process is reduced from V1 to the minimum flow rate V2 in a certain flow rate range in which the capillary group ensures that the refrigeration system can normally operate, and the running time of the capillary group flow rate V2 in the certain flow rate range in which the refrigeration system can normally operate is t. At this time, the rotation speed of the condenser fan is S1, the rotation speed of the compressor is M1, and the refrigeration system provides the maximum cold air for the instant freezing chamber.
Furthermore, t is more than 0 and less than or equal to 10 h.
Further, in order to more intuitively reflect the parameter changes of the devices involved in the cooling control in the entire supercooling process, the parameter changes of the respective devices are further described below in the form of a table:
TABLE 1 instant Freeze Process control example
Figure BDA0002254598030000281
Preferably, the rotating speed of the freezing fan is kept at P1 all the time, and the rotating speed of the freezing fan is kept unchanged in the whole supercooling process.
Preferably, the working parameters of the instantaneous freezing chamber air door are constant in the staged cooling and supercooling process and the supercooling release process, the opening degree of the instantaneous freezing chamber air door is Q1, and the working parameters of the instantaneous freezing chamber air door are adjusted according to the temperature of the instantaneous freezing chamber in the conventional refrigeration and preservation process.
Preferred compressor speed: m1 is more than or equal to 1200rpm and less than or equal to 1400 rpm;
preferably, the condenser fan speed: s1 is more than or equal to 1200rpm and less than or equal to 1500 rpm;
preferred capillary group flow rates: v1 is more than or equal to 4.5L/min and less than or equal to 5L/min; v2 is more than or equal to 2L/mi and less than or equal to 3L/min.
The beneficial effect of this embodiment lies in: it is ensured that as much water as possible in the food product in a supercooled state instantaneously forms ice crystals, rapidly passing through the largest ice crystal generation zone.
S03: conventional refrigeration preservation process
The timer counts the supercooling release process S02, and when the preset supercooling release process duration is reached, the routine preservation process S03 is entered, and it should be further noted that in this embodiment, the operation time of the S02 process should be greater than or equal to t, that is, the capillary group flow rate is at the operation time t of V2, and then the routine preservation process S03 is entered. The temperature adjustment can be realized by using the gear change of the refrigerating fan in the normal preservation stage, but the embodiment preferably executes the normal preservation process after the supercooling release process operation is finished as follows:
in the conventional refrigeration preservation process, the temperature of the storage object in the instant freezing chamber is maintained at a preset temperature Tc, wherein Tc is more than or equal to minus 7 ℃ and less than 0 ℃;
the conventional refrigeration preservation process is carried out according to a preset temperatureThe control method for the operation of the degree 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，TONc>Tc>TOFFc；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.
Fig. 7 is a schematic view of the instant freezer of this embodiment. The instant freezing chamber comprises an instant freezing storage area box body 120, a temperature sensor 33 and an infrared sensor 35. The flash chamber 12 may be provided therein with a flash storage area box 120. The temperature sensor 33 and the infrared sensor 35 may be disposed on a sidewall of the instant freezing storage area box 120 in this embodiment, the temperature sensor 33 may be used to monitor the temperature of the instant freezing chamber 12, and the infrared sensor may be used to monitor the temperature of the food stored in the instant freezing storage area box 120.
Further, fig. 7 is a schematic diagram of a structural arrangement of the instant freezing chamber of the present invention, and shows some components of the instant freezing chamber in this embodiment, and the instant freezing chamber structure shown in fig. 7 should not be understood as the only structure of the instant freezing chamber of the present invention.
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 (12)

1. A refrigerating apparatus comprising a flash freezing chamber having a flash freezing function, a refrigerating system for supplying a flash freezing amount of cold to the flash freezing chamber, and a control unit for controlling the refrigerating system to perform flash freezing storage of the flash freezing chamber, the control unit comprising a controller and a timer, characterized in that: refrigeration plant still is provided with the capillary group, the control unit is through controlling refrigerating system is to the room implementation cooling stage by stage supercooling process and supercooling remove the process to freezing in the twinkling of an eye, wherein:
the staged cooling process comprises m cooling stages, wherein m is more than or equal to 2 and is a natural number;
each cooling stage of the m stages is provided with a preset accumulated working time length of the compressor corresponding to the stage;
the compressor is controlled to periodically work stage by stage according to a preset accumulated working time; in each period, the compressor is controlled to be intermittently started and stopped according to a preset operation period;
when the compressor finishes the preset accumulated working time period in the nth stage to be
Figure FDA0002254598020000011
Then, automatically entering the (n + 1) th stage to carry out the next stage of cooling, and finishing the preset accumulated working time of the (n + 1) th stage
Figure FDA0002254598020000012
m is more than or equal to n and more than or equal to 1, and n is a natural number; preset cumulative working time of compressor at nth stage
Figure FDA0002254598020000013
tni represents the working time of the compressor in the ith working period of the nth stage; i is greater than or equal to 1 and is a natural number;
preset accumulated working time when the compressor completes the last mth stage
Figure FDA0002254598020000014
The instant freezing chamber enters into the supercooling relieving process;
supercooling release process: the flow rate of the capillary group is reduced to V2 flow rate from V1 flow rate in the process of cooling and supercooling by stages, V2< V1, and the capillary group keeps V2 flow rate for t time.
2. A method for controlling instant freezing of a refrigeration apparatus provided with an instant freezing chamber and a refrigeration system capable of supplying cold to the instant freezing chamber and having a compressor, characterized in that:
controlling the refrigerating system to carry out the following staged cooling and supercooling process and supercooling release process on the instant freezing chamber:
the staged cooling process comprises m cooling stages, wherein m is more than or equal to 2 and is a natural number; each cooling stage of the m stages is provided with a preset accumulated working time length of the compressor corresponding to the stage; controlling the compressor to work stage by stage according to the preset accumulated working time of each stage; in each cooling stage, controlling the compressor to work intermittently and calculating the working time of the compressor; the preset cumulative working time of the compressor at the nth stage is recorded as
Figure FDA0002254598020000021
Wherein t isni represents the working time of the compressor starting at the ith time in the nth stage; i is greater than or equal to 1 and is a natural number;
when the compressor completes the preset accumulated working time in the nth stage
Figure FDA0002254598020000022
Then, automatically entering the (n + 1) th stage, cooling the next stage, and finishing the preset accumulated working time of the (n + 1) th stage
Figure FDA0002254598020000023
m is more than or equal to n and more than or equal to 1, and n is a natural number;
until the last mth stage cooling and the corresponding preset accumulated working time of the mth stage are completed
Figure FDA0002254598020000024
Supercooling release process: the refrigerating equipment is also provided with a capillary group, the flow rate of the capillary group is reduced from V1 flow rate in the staged cooling and supercooling process to V2 flow rate, V2< V1, and the capillary group keeps V2 flow rate for t time.
3. A method for controlling instant freezing of a refrigeration apparatus provided with an instant freezing chamber and a refrigeration system having a compressor for supplying cold to the instant freezing chamber, characterized in that: controlling the refrigerating system to implement a transient freezing storage process provided with a staged cooling and supercooling process and a supercooling release process on the transient freezing chamber, wherein:
the staged cooling process comprises m cooling stages, wherein m is more than or equal to 2 and is a natural number;
each cooling stage of the m stages is provided with a preset stage cooling duration;
in the cooling time length of each preset stage, the compressor is controlled to start and stop in a preset single starting time length, a preset running period and a preset accumulated working time length;
when the compressor works in the nth stage, the preset operation period is tni', preset accumulated working time period of
Figure FDA0002254598020000031
n represents any natural number from 1 to m, n is more than or equal to 1 and less than or equal to m; t is tni represents the preset single start-up time of the compressor in the ith working cycle of the nth stage,
Figure FDA0002254598020000032
i is more than or equal to 1 and is a natural number;
thus, the compressor is controlled to periodically work stage by stage according to the preset stage cooling time length, the preset operation period, the preset single starting time length and the preset accumulated working time length until the preset accumulated working time length of the last mth stage is completed
Figure FDA0002254598020000033
Then entering the supercooling relieving process;
supercooling release process: the refrigerating equipment is also provided with a capillary group, the flow rate of the capillary group is reduced from V1 flow rate in the staged cooling and supercooling process to V2 flow rate, V2< V1, and the capillary group keeps V2 flow rate for t time.
4. A instant freezing control method of a refrigerating apparatus as set forth in any one of claims 2 to 3, wherein: when the compressor finishes the lastm-stage cooling and corresponding preset accumulated working time
Figure FDA0002254598020000034
Then, entering into a supercooling relieving process; and entering a conventional refrigeration preservation process after the supercooling removing process reaches the preset supercooling removing time.
5. A control method for instant freezing of refrigeration equipment, wherein the refrigeration equipment is provided with an instant freezing chamber and a refrigeration system which supplies cold for the instant freezing chamber and is provided with a compressor, and is characterized in that: in implementing the control of the flash freezing chamber comprising:
s0: starting a instant freezing storage mode;
s1: carrying out a staged cooling process on the stored substances in the instant freezing chamber;
s2: performing a supercooling release process on the contents stored in the instant freezing chamber;
s3: performing a conventional refrigeration preservation process on the storage in the instant freezing chamber;
in the S1 process, m cooling stages are carried out stage by stage, and the working time of the compressor is timed in each stage;
when the compressor finishes the preset accumulated working time period in the nth stage to be
Figure FDA0002254598020000041
Then, automatically entering the (n + 1) th stage to carry out the next stage of cooling, and finishing the preset accumulated working time of the (n + 1) th stage
Figure FDA0002254598020000042
Wherein m is more than or equal to n and more than or equal to 1; m and n are natural numbers; t is tni represents the working time of the compressor in the ith working period of the nth stage; i is more than or equal to 1, and i is a natural number; preset cumulative working time of compressor at nth stage
Figure FDA0002254598020000043
Preset accumulated working time when the compressor completes the last mth stage
Figure FDA0002254598020000044
Then, the process proceeds to supercooling release process S2;
wherein the S3 supercooling release process: the refrigerating equipment is also provided with a capillary group, the flow rate of the capillary group is reduced from V1 flow rate in the staged cooling and supercooling process to V2 flow rate, V2< V1, and the capillary group keeps V2 flow rate for t time;
the supercooling release process S2 is timed, and when the preset supercooling release process time period is reached, the conventional refrigeration storing process S3 is performed.
6. A transient freezing control method of a refrigerating apparatus as recited in any one of claims 2 to 5, wherein: controlling the duty ratio of the compressor at the 1 st cooling stage of the staged cooling process to be 1 maximum, and controlling the accumulated working time of the compressor
Figure FDA0002254598020000045
The longest length; and in the 1 st temperature reduction stage, the temperature of the storage materials in the instant freezing chamber is reduced to 5 ℃ to-1 ℃.
7. A transient freezing control method of a refrigerating apparatus as recited in any one of claims 2 to 6, wherein: the staged cooling process at least comprises 3 stages, from stage 2, the duty ratio n +1 of the n +1 stage of the compressor is larger than that of the n stage of the compressor, namely n +1>N; the preset single starting time t of the preset operation cycle of the compressor at the n +1 th stagen+1i is greater than the preset single starting time t of the preset operation cycle of the nth stageni, namely: t is tn+1i>tni; the staged temperature reduction and supercooling process reduces the temperature of the storage materials in the instant freezing chamber to-2 ℃ to-6 ℃.
8. The instant freezing control method of a refrigerating apparatus as set forth in claim 7, wherein: after the operation of the supercooling release process is finished, executing a conventional refrigeration preservation process; in the conventional refrigeration preservation process, the temperature of the storage object in the instant freezing chamber is maintained at a preset temperature Tc, wherein Tc is more than or equal to minus 7 ℃ and less than 0 ℃;
the control method for the conventional refrigeration 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 air door of the instant freezing chamber; t isONc＝Tc+TB1/2,TOFFc＝TONc–TB2/2，TONc>Tc>TOFFc；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.
9. The instant freezing control method of a refrigerating apparatus as set forth in claim 8, wherein: entering the conventional refrigeration preservation process, the capillary bank operates at a V1 flow rate.
10. The instant freezing control method of a refrigerating apparatus as set forth in claim 9, wherein: the refrigerating equipment is also provided with a freezing fan, an instantaneous freezing chamber air door and a condenser fan; the working parameters of the condenser fan, the capillary group, the freezing fan and the instantaneous freezing chamber air door are controlled and kept unchanged in the process of cooling by stages.
11. The instant freezing control method of a refrigerating apparatus as set forth in claim 10, wherein: the working parameters of a condenser fan, a capillary tube group, a freezing fan and a compressor in the refrigeration system are controlled and kept unchanged in the conventional refrigeration preservation process.
12. A refrigerating apparatus having an instant freezing chamber with instant freezing function, characterized in that: a method of flash freeze control for a refrigeration appliance using any one of claims 2 to 11.
CN201911047991.8A 2019-10-30 2019-10-30 Instant freezing control method for refrigeration equipment and refrigeration equipment Pending CN110986456A (en)

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