CN110940131A - Instant freezing chamber control method and refrigerator - Google Patents
Instant freezing chamber control method and refrigerator Download PDFInfo
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- CN110940131A CN110940131A CN201911046602.XA CN201911046602A CN110940131A CN 110940131 A CN110940131 A CN 110940131A CN 201911046602 A CN201911046602 A CN 201911046602A CN 110940131 A CN110940131 A CN 110940131A
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- 238000007710 freezing Methods 0.000 title claims abstract description 176
- 230000008014 freezing Effects 0.000 title claims abstract description 176
- 238000000034 method Methods 0.000 title claims abstract description 170
- 238000001816 cooling Methods 0.000 claims abstract description 149
- 230000008569 process Effects 0.000 claims abstract description 121
- 238000004781 supercooling Methods 0.000 claims abstract description 104
- 238000004321 preservation Methods 0.000 claims abstract description 32
- 238000005057 refrigeration Methods 0.000 claims abstract description 23
- 238000003860 storage Methods 0.000 claims description 18
- 238000007667 floating Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 abstract description 12
- 238000009826 distribution Methods 0.000 abstract description 3
- 235000013305 food Nutrition 0.000 description 63
- 230000001276 controlling effect Effects 0.000 description 21
- 239000013078 crystal Substances 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 239000003507 refrigerant Substances 0.000 description 11
- 238000001704 evaporation Methods 0.000 description 9
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- 238000011946 reduction process Methods 0.000 description 2
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- 238000010257 thawing Methods 0.000 description 2
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- 230000005494 condensation Effects 0.000 description 1
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- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 235000013611 frozen food Nutrition 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
- F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention relates to a control method of an instant freezing chamber and a refrigerator. The instant freezing chamber control method comprises a multi-stage supercooling and cooling process, a supercooling removing process and a conventional refrigeration and preservation process. In the multi-stage supercooling and cooling process, the object to be cooled is cooled in stages, and the cooling in each stage is realized by cooling control on the object to be cooled. And each temperature reduction stage controls the instant freezing chamber for storing the cooled object to run for Tn time according to the preset temperature Tn, so that the temperature distribution of the instant freezing chamber for storing the cooled object in the process of a single temperature reduction stage is more uniform. And in the supercooling relieving process, reducing the flow of capillary tubes in the refrigerating system, increasing the rotating speed of a condensing fan and the rotating speed of a compressor, increasing the cooling capacity of the cooled object in the supercooling state, fully relieving the supercooling state of the cooled object with larger volume and further realizing instant freezing of the cooled object. The frozen refrigerated object is stored for a long time at a normal refrigerated preservation temperature.
Description
Technical Field
The invention relates to a control method of an instant freezing chamber and a refrigerating system, in particular to a control method capable of realizing instant freezing of food and a refrigerator.
Background
In order to better maintain the nutrition of frozen food, the food is preserved by adopting the freezing modes of ordinary freezing, quick freezing and the like, but the traditional ordinary freezing has the defects of uneven temperature control in a freezing chamber, long-time stay in the maximum ice crystal generation zone and the like; although the rapid freezing can rapidly pass through the maximum ice crystal generation zone, the production cost is high, and the rapid freezing is not beneficial to popularization and application in refrigerators. The supercooling freezing technology can ensure that the preserved object forms uniform and fine ice crystals after the supercooling process, can better keep the flavor of food compared with the common freezing method, and is more favorable for cutting.
The existing technology for supercooling preservation has the following disadvantages:
(1) the supercooling is released in advance due to uneven temperature reduction in the supercooling process.
(2) The supercooling relieving effect is not good, and the wind speed or the wind volume is increased.
(3) The supercooling depth is shallow, and the state of supercooling cannot be well entered.
Disclosure of Invention
In view of the above, the invention provides an instant freezing chamber control method and a refrigerator.
The invention relates to a control method of an instant freezing chamber and a refrigerator. The instant freezing chamber control method comprises a multi-stage supercooling and cooling process, a supercooling removing process and a conventional refrigeration and preservation process. In the multi-stage supercooling and cooling process, the object to be cooled is cooled in stages, and the cooling in each stage is realized by cooling control on the object to be cooled. And each temperature reduction stage controls the instant freezing chamber for storing the cooled object to run for Tn time according to the preset temperature Tn, so that the temperature distribution of the instant freezing chamber for storing the cooled object in the process of a single temperature reduction stage is more uniform. And in the supercooling relieving process, reducing the flow of capillary tubes in the refrigerating system, increasing the rotating speed of a condensing fan and the rotating speed of a compressor, increasing the cooling capacity of the cooled object in the supercooling state, fully relieving the supercooling state of the cooled object with larger volume and further realizing instant freezing of the cooled object. The frozen cooled object is stored for a long time at a normal refrigerated storage temperature.
Specifically, the method comprises the following steps:
the invention provides a refrigerator, which comprises:
the instant freezing chamber is provided with a cooling device for providing cold energy for the instant freezing chamber and a control system for controlling the cooling device to carry out instant freezing preservation on the instant freezing chamber;
the instant freezing preservation process of the cooled object in the instant freezing chamber is realized by implementing cooling control on the instant freezing chamber;
the cooling device comprises a compressor, an evaporator, a condenser and a capillary tube group; the capillary group is formed by connecting at least two capillary pipelines with different rated flows in parallel, and the capillary group is provided with a flow path control valve so that the flow of the capillary group can be adjusted;
a condenser fan is arranged on the condenser;
the control system includes: a controller, a temperature sensor and a timer;
the instant freezing preservation comprises a multi-stage supercooling and cooling process, a supercooling relieving process and a conventional refrigeration preservation process;
the control system carries out staged cooling on the cooled object according to the preset operation target temperature and the preset operation duration of each multi-stage supercooling cooling process; in the final stage of the multi-stage supercooling and cooling process, after the preset stage cooling is completed in the preset time period, the controller simultaneously executes the following operations: controlling the flow control valve to reduce the flow of the capillary group, controlling the rotating speed of a fan of the condenser to increase, and controlling the rotating speed of the compressor to increase; and the reduced capillary flow, the increased rotating speed of the condenser fan and the increased rotating speed of the compressor are kept to run together for a time ta to remove the supercooling.
The invention provides a method for controlling an instant freezing chamber, which carries out instant freezing preservation on the instant freezing chamber by controlling a cooling device, and is characterized in that:
the instant freezing preservation process of the cooled object in the instant freezing chamber is realized by implementing cooling control on the instant freezing chamber;
the instant freezing preservation process with a multi-stage supercooling and cooling process, a supercooling relieving process and a conventional refrigeration preservation process is carried out on the cooled object in the instant freezing chamber through a cooling device;
the multi-stage supercooling and cooling process comprises n cooling stages, wherein each cooling stage of the n cooling stages is provided with a preset operation target temperature and a preset operation duration; the multi-stage supercooling and cooling process carries out staged cooling on the cooled object according to a preset running target temperature and a preset running time;
in the final stage of the multi-stage supercooling and cooling process, after the preset stage cooling is completed in the preset time period, the controller simultaneously executes the following operations: controlling the flow control valve to reduce the flow of the capillary group from a first flow V1 to a second flow V2, increasing the fan speed of the condenser from a first fan speed S1 to a second fan speed S2 by the controller, and increasing the compressor speed from a first compressor speed M1 to a second compressor speed M2 by the controller;
and the supercooling is released while keeping the reduced capillary flow rate V2, the increased condenser fan rotation speed S2 and the increased compressor rotation speed M2 operating together for a time ta.
Preferably, when the flow rate of the capillary group is V2, the rotating speed of the compressor is M2 and the fan of the condenser is S2 during the supercooling release process, the cooling capacity of the instant freezing chamber (12) supplied by the cooling device is maximum.
Preferably, the value range of the preset operation ta time is 0h < ta ≦ 10 h.
Preferably, after the multi-stage supercooling and cooling process is finished, the timer transmits a signal of finishing the supercooling and staged cooling process to the controller; the controller simultaneously sends the following operation instructions: sending an instruction for reducing the flow of the capillary group to the capillary flow path control valve, sending an instruction for increasing the rotating speed of the condenser fan to the rotating speed adjusting device of the condenser fan, and sending an instruction for increasing the rotating speed of the compressor to the rotating speed adjusting device of the compressor; when the conditions that the flow rate of the capillary group is reduced to the preset second flow rate V2, the rotating speed of the condenser fan is increased to the preset second rotating speed S2 and the rotating speed of the compressor is increased to the second rotating speed M2 of the compressor are met at the same time, the timer starts to time, and the controller controls the capillary group to operate at the second flow rate V2, the condenser fan to operate at the second rotating speed S2 of the fan and the compressor to operate at the second rotating speed M2 of the compressor for a time ta.
Preferably, in the 1 st stage of the multi-stage supercooling and cooling process, the rotation speed of the compressor is operated at the maximum rotation speed M2, and after the 1 st stage of the multi-stage supercooling and cooling process is finished, the compressor is operated at the first rotation speed M1 in the subsequent multi-stage supercooling and cooling process.
Preferably, the n cooling stages are at least at the last cooling stage, and after reaching the cooling target, the n cooling stages are stabilized at the preset target temperature for a period of time until the preset time of the cooling process is finished.
Preferably, in the process of n cooling stages in the cooling process, the n cooling stages are divided into stages 1, … … i and … … n, wherein the i cooling stage represents any stage of the n cooling stages, i is greater than or equal to 1 and less than or equal to n, n is a natural number and is greater than or equal to 2, and the start and stop of the air supply device are controlled according to the preset temperature of the cooling stages, namely T is used for controlling the start and stop of the air supply deviceONi＝Ti+TB1The temperature T is used as the starting temperature point of the air supply device in the ith stageoffi＝TOni-TB2[ ii ] 2 as the shutdown temperature point of the blower in the i-th stage, TB1Indicates the floating temperature T of the starting point of the instantaneous freezing chamber in the starting process of the compressorB2Temperature difference between instant freezing chamber start and stop, TOni>Ti>Toffi；
In the i-th stage:
when the storage temperature of the cooled object reaches TONi＝Ti+TB1When the pressure exceeds 2, the air supply device is controlled to work;
when the storage temperature of the cooled object reaches Toffi＝TONi-TB2And when the pressure exceeds 2, controlling the air supply device not to work.
Preferably, the air supply device is a cold air supply door for performing cold supply control of the instant freezing chamber.
Preferably, the value range of the time ti for cooling control on the cooled object in the ith stage in the multi-stage supercooling and cooling process is 0h < ti ≦ 8 h.
Preferably, the preset target temperature of the multi-stage supercooling cooling process satisfies: t1 is more than or equal to 0 ℃ at the temperature of 5 ℃; tn is more than or equal to-15 ℃, T2 is more than or equal to 0 ℃, i is more than or equal to 2 and less than or equal to n.
Preferably, the conventional refrigeration storage process is carried out such that the cooled material is operated at a predetermined temperature Tc of-7 ℃ Tc <0 ℃.
Preferably, the control method for the conventional preservation process to operate according to the preset temperature Tc comprises the following steps: when the temperature of the instant freezing chamber reaches the starting temperature point TONc, opening an air door of the instant freezing chamber; when the temperature of the instant freezing chamber reaches a first shutdown temperature point TOFFc, closing the air door of the instant freezing chamber; t isONc＝Tc+TB1/2,TOFFc＝ TONc–TB2/2；TB1Indicating the floating temperature of a starting point of an instant freezing chamber in the starting process of the compressor; t isB2The temperature difference between the start and stop of the instant freezing chamber.
Preferably, TB1The value range of (A) is 0 DEG C<TB1≤2℃，TB2The value range of (A) is 0 DEG C<TB2≤2℃。
Preferably, in the multi-stage supercooling and cooling process, the flow rates of the capillary tube groups are kept constant and are all the first flow rate V1, and the rotation speeds of the condenser fan are all the first rotation speed S1 of the fan.
Preferably, the flow rates of the capillary group in the conventional preservation process are all the first flow rate V1, the fan rotating speed of the condenser is all the first rotating speed S1 of the fan, and the rotating speed of the compressor is all the first rotating speed M1 of the compressor.
The invention also provides a refrigerator which is provided with the control system for realizing the instant freezing chamber control method. The refrigerator comprises an instant freezing chamber, and the instant freezing chamber adopts the instant freezing chamber control method to carry out instant freezing storage on the cooled object.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely exemplary embodiments of the present disclosure, and other drawings may be derived by those skilled in the art without inventive effort.
FIG. 1 is a control logic diagram of an embodiment of the present invention;
FIG. 2 is a diagram of a refrigeration system according to an embodiment of the present invention;
FIG. 3 is a refrigerant flow diagram according to an embodiment of the present invention;
FIG. 4 is a structural view of a refrigerator according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a freezing curve of water at normal freezing in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of the freezing curve of water in an embodiment of the present invention in the presence of a supercooling freezing process;
FIG. 7 is a schematic diagram of a refrigerator control system according to an embodiment of the present invention;
FIG. 8 is a graph of temperature versus time for a food product stored in a flash chamber throughout a sub-cooling process in accordance with an embodiment of the present invention;
in the figure:
refrigerator-10; a refrigerating chamber-11; instant freezing chamber-12; freezing chamber-13;
a refrigeration system-20; a refrigeration evaporator-21; a muffler assembly-220; a return gas heat exchange section-221; a compressor-23; condenser-24; anti-condensation pipe-25; a drier-filter-26; capillaries 1-271; capillary 2-272; an electric switching valve 28;
control system-30; a controller-31; a display-32; a temperature sensor-33; a temperature regulating device-34; a frequency conversion plate-35; a timer-36; a condenser fan-37;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
The instant freezing technique is briefly described below with reference to fig. 5 and 6.
The supercooled state refers to a liquid having a temperature lower than the freezing point but not solidified or crystallized, and is called a supercooled liquid. There is a great demand for long-term preservation of foods such as fresh meat, fruits and vegetables in daily life. The fresh meat, fruits and vegetables and other foods contain a large amount of water, and the ice crystals are large in size and usually form needle-shaped ice crystals during ordinary freezing, so that cells can be damaged, a large amount of juice flows out during thawing, large ice crystals can extrude the tissue structure of the foods, the foods lose delicate flavor substances, and the user experience is poor.
The condition of the food entering the overcooling state mainly influences whether the food can well enter the overcooling state or not according to the temperature reduction speed, the air temperature distribution around the sample and the difference value of the surface temperature and the central temperature of the food. Fig. 5 shows a schematic diagram of a normal freezing and freezing curve of water, namely a freezing and freezing curve without supercooling, and fig. 6 shows a schematic diagram of a freezing curve of water with supercooling freezing process. Analysis shows that the ordinary freezing process of water in fig. 5 is that the water slowly begins to freeze from the surface of the water with the increase of time. In contrast, fig. 6 shows the supercooling freezing process of water, in the initial stage of the freezing process, even if the freezing point of water is exceeded, the water does not start to freeze but continues to remain in a liquid state, and when the temperature drops to the nucleation point or a certain stimulus is externally applied, the water in the supercooled state instantaneously starts to freeze on the surface and inside.
The principle of the supercooling freezing technology is that ice nuclei in water are uniformly distributed and are in a large number when the ice nuclei begin to freeze after being in a supercooling state, most of ice crystals formed after freezing are in an elliptic granular shape, and the ice crystals have small volume and uniform size and are different from needle-shaped ice crystals which are generated by common freezing and are easy to damage cells. The food in the supercooled state can better keep the delicate flavor of the food, reduce the damage of ice crystals to food cells, reduce the outflow of the contents of the food cells after unfreezing and improve the user experience.
The basic inventive idea is as follows:
the invention provides a method for controlling an instant freezing chamber and a refrigerator, which ensure that a cooled object in the instant freezing chamber 12 enters a supercooled state through multistage cooling in a multistage supercooling cooling process. The supercooling release process is controlled by simultaneously performing the following control means: controlling the flow control valve of the capillary group to regulate the flow of the capillary group and reduce the flow of the capillary group; controlling the rotating speed of the condensing fan to be reduced; and controlling the rotating speed of the compressor to be reduced. The three control means can increase the supply of cold energy, so that the object to be cooled in the supercooling state in the instant freezing chamber is released from the supercooling state to realize instant freezing, and uniform and fine ice crystals are formed. And finally, the temperature of the instant freezing chamber 12 is controlled to be within the range of the conventional refrigeration preservation temperature, so that the cooled object is preserved for a long time.
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings 1-4, and fig. 7 and 8:
the embodiment shown in fig. 2 provides a refrigeration system that performs any of the control methods of the present invention. The system comprises but is not limited to the following components: the refrigeration evaporator 21, the air return pipe assembly 220, the air return heat exchange section 221, the compressor 23, the condenser 24, the condensation preventing pipe 25, the drying filter 26, the capillaries 1-271, the capillaries 2-272 and the electric switching valve 28.
As shown in fig. 3, the refrigerant flow direction when the refrigeration system is in operation is: compressor → condenser → anti-condensation tube → dry filter → electric switch valve → capillary tube 1 or capillary tube 2 → refrigeration evaporator → return air tube component → compressor.
The purpose of reducing the flow rate of the refrigerant passing through the capillary tube in unit time can be achieved by reducing the flow of the capillary tube group, reducing the inner diameter of the capillary tube or increasing the total length of the capillary tube, so that the quality of the refrigerant entering the evaporator in unit time is reduced, when the suction pressure of the compressor is unchanged, the quality of the refrigerant is reduced, the evaporation pressure is reduced, the reduction of the evaporation pressure is equal to the reduction of the evaporation temperature, the surface temperature of the evaporator can be reduced, and the air temperature of a cavity of the evaporator is reduced.
Through increasing the rotational speed of condenser fan, the heat exchange of refrigerant and outside air in the acceleration condenser to reduce condensing pressure, make the refrigerant quality that gets into in the evaporimeter in the unit interval diminish, when the compressor suction pressure unchangeable, the refrigerant quality diminishes makes evaporating pressure can reduce, evaporating pressure's reduction is equal to evaporating temperature's reduction, thereby can realize the surface temperature decline of evaporimeter, reduce the air temperature of evaporimeter cavity, through wind channel circulation again in the refrigerator that this embodiment relates to, make microthermal cold air get into in the instant freezing room, reach rapid cooling's purpose.
The rotating speed of the compressor is increased, so that the quantity of the refrigerant conveyed from the exhaust end of the compressor and the suction quantity of the refrigerant at the suction end of the compressor in unit time are increased, the circulation of the refrigerant in the pipeline is accelerated under the condition that the flow of the capillary tube is not changed, the refrigerating capacity of the evaporator is improved in unit time, the air temperature of a cavity of the evaporator is reduced, and the low-temperature cold air enters the instant freezing chamber through air channel circulation in the refrigerator related to the embodiment, so that the aim of quickly cooling is fulfilled.
The rotating speed of the compressor is increased, so that the condensing pressure is increased, the evaporating pressure is reduced, at the moment, the rotating speed of the fan of the condenser is synchronously increased, the condensing pressure can be reduced, the evaporating temperature is lower, if the flow of the capillary tube is reduced within a certain range, the evaporating temperature reduction extreme value of the refrigerating system can be reached, and the purpose of supplying the maximum refrigerating capacity is realized.
As shown in fig. 7, the present invention also provides a control system including: the controller 31 is in control connection with the display 32, the temperature sensor 33, the temperature adjusting device 34, the frequency conversion plate 35, the timer 36, the condenser fan 37 and the electric switching valve 28, and the controller 31 controls the rotation speed of the compressor 23. The control system is used for realizing the instant freezing chamber control method provided by the invention.
Further, the electric switch valve 28 in the control system can realize the flow control of the capillary group, which is one of the flow path control valves. The electric switching valve is only used as an example of implementing the flow path switching of the capillary group to control the flow rate of the capillary in the present embodiment, and it should be understood that a flow path control valve capable of realizing the flow rate variation of the capillary group is within the protection scope of the present invention.
Further, the controller 31 in the control system sends a compressor rotation speed adjusting instruction to the frequency conversion plate 35, and the frequency conversion plate 35 adjusts the rotation speed of the compressor 23. The inverter board in this embodiment is only one example of a compressor speed adjusting device, and should not be understood as the only means for adjusting the compressor speed by using the inverter board.
Further, the temperature adjusting device 34 adjusts the temperature of the instant freezing chamber by using a cold air supply door of the instant freezing chamber.
Further, the user may select the instant freezing function through the display 32, and the control system performs the instant freezing chamber control method when the user selects the instant freezing function.
The embodiment also provides a refrigerator which is provided with the control system for realizing the instant freezing chamber control method. The refrigerator comprises an instant freezing chamber 12, and the instant freezing chamber 12 carries out instant freezing storage on cooled objects by adopting the instant freezing chamber control method. The cooled material can be food, especially fresh meat food.
The instant freezing chamber 12 in this embodiment can realize various low-temperature storage processes of food, such as a supercooling non-freezing storage process, a supercooling freezing removal storage process, a low-temperature refrigeration function, a freezing process, and the like. The user can select the storage process according to the self needs, and the instant freezing chamber can only realize the instant freezing storage process shown in the embodiment.
When the refrigerator implementing the instant freezing chamber control method is an air-cooled refrigerator, the rotating speed of a freezing fan of the instant freezing chamber is kept unchanged in the whole process of implementing the instant freezing chamber control method.
As shown in fig. 4, the refrigeration system executing any control method of the present embodiment may be a refrigerator including a refrigerating compartment 11, an instant freezing compartment 12, and a freezing compartment 13, and the refrigerator according to the present invention has a control system that enables the refrigerator to perform an instant freezing control process on food placed in the instant freezing compartment 12.
The instant freezing chamber control method according to the present embodiment will be described below.
As shown in fig. 1, a method for controlling an instant freezer includes the steps of:
s01: a multi-stage cooling and supercooling process:
n cooling stages exist in the multi-stage cooling process, and the n cooling stages are divided into 1 st stage, … … i stage and … … th stage, wherein the ith cooling stage represents any one stage of the n cooling stages, i is more than or equal to 1 and less than or equal to n, n is a natural number, and n is more than or equal to 2.
1, cooling stage: and controlling the instant freezing chamber to operate at the preset temperature T1 for T1 time through the controller, and enabling the compressor to rotate at a second rotating speed M2 within T1 time.
Further, the second compressor rotation speed M2 is the maximum compressor rotation speed.
The beneficial effects are that: when the food needs to be cooled, the rotating speed of the compressor is increased, so that the cooling capacity can be increased, the cooling rate of the instant freezing chamber is increased, the food is enabled to be stabilized around the temperature T1 more quickly, and the early preparation time of the food in the overcooling state is shortened. The first temperature reduction stage controls the instant freezing chamber to operate according to the preset temperature T1, so that the temperature of the instant freezing chamber is kept in a small-range temperature interval containing the temperature T1, the overall temperature of the instant freezing chamber is conveniently and uniformly reduced in the subsequent multi-stage supercooling and temperature reduction process, the temperature difference between the surface and the interior of the food placed in the instant freezing chamber is smaller, and the food can smoothly enter a supercooling state in the subsequent multi-stage supercooling and temperature reduction process.
Furthermore, T1 is more than 0 ℃ at the temperature of 5 ℃ or more, and T1 is more than 0h at the temperature of 8h or more.
Further, before step S01, the method further includes the steps of: aS 01: the user selects the instant freeze function.
An i +1 th cooling stage: and after the step of the 1 st cooling stage is finished, the compressor is operated at a first rotating speed M1, and after the step of the 1 st stage of the multi-stage supercooling cooling process is finished, the rotating speed of the compressor is operated at the first rotating speed M1 which is lower than the second rotating speed M2 of the compressor in the subsequent multi-stage supercooling cooling process.
In the S01 multi-stage cooling and supercooling process, the condenser fan is always operated at a first rotating speed S1, and the capillary tube group; the flow rate is always kept at the first flow rate V1, and the compressor speed M2> M1. The cooling method has the beneficial effects that the rotating speed of the compressor at the (i + 1) th cooling stage is recovered to M1, and the cooling capacity can be reduced by reducing the rotating speed of the compressor. When the cooled food enters the overcooling state, the slow cooling rate and the low cooling capacity are needed, so that the effect that the cooled food successfully enters the overcooling state and is not easily released from the overcooling state can be realized, and therefore, the effect can be realized by reducing the rotating speed of the compressor.
The multi-stage supercooling and cooling process comprises n cooling stages, wherein each cooling stage of the n cooling stages implements cooling control on food, temperature control is implemented on the food according to the preset temperature Ti of the cooling stages, and meanwhile the operation Ti time of the ith cooling stage is controlled.
Further, during the control process of air cooling on the food in the i stage, T is usedONi＝Ti+TB1The temperature T is used as the starting temperature point of the air supply device in the ith stageoffi＝TONi-TB2[ ii ] 2 as the shutdown temperature point of the blower in the i-th stage, TB1Indicates the floating temperature T of the starting point of the instant freezing chamber (2) in the starting process of the compressorB2Temperature difference between instant freezing chamber start and stop, TONi>Ti>Toffi。
In the i-th stage:
when the storage temperature of the cooled object reaches TONi＝Ti+TB1When the pressure exceeds 2, the air supply device is controlled to work;
when the storage temperature of the cooled object reaches Toffi＝TONi-TB2And when the pressure exceeds 2, controlling the air supply device not to work.
Furthermore, the time for implementing cooling control on the food in the ith stage in the multi-stage supercooling and cooling process is ti, and 0h < ti is less than or equal to 8 h. The beneficial effects are that: the control of the cooling time ti is implemented through the timer in a single cooling stage, so that the temperature difference between the surface and the inside of the food is favorably reduced for the single cooling stage, the success probability of the food entering the supercooling state is increased, and the condition that the food entering the supercooling state is easily released in advance can be avoided.
Further, TB1And T B20 ℃ as a known parameter<TB1≤2℃；0℃<TB2≤2℃。
Further, the air supply device is controlled to control the cold air supply door.
Further, the cooling air door is provided with a baffle capable of realizing mechanical control.
Furthermore, the value range of the first rotating speed M1 of the compressor is that the rotating speed is more than or equal to 1200rpm and less than or equal to M1 and less than or equal to 1400rpm, and the value range of the second rotating speed M2 of the compressor is that the rotating speed is more than or equal to 3800rpm and less than or equal to M2 and less than or equal to 4500 rpm.
Furthermore, Tn is more than or equal to 15 ℃ and less than or equal to 0 ℃ in the (i + 1) th cooling stage in the multi-stage cooling and supercooling process, and T2 is more than or equal to 0 ℃ and i is more than or equal to 2 and less than or equal to n.
S02: supercooling release process: at the final stage of the multi-stage supercooling and cooling process, after the preset stage cooling is finished in a preset time period, the following three control steps are simultaneously carried out: controlling the flow control valve to reduce the flow of the capillary group from a first flow V1 to a second flow V2, increasing the rotation speed of a condenser fan from a first rotation speed S1 to a second rotation speed S2 by the controller, and increasing the rotation speed of a compressor from a first rotation speed M1 of the compressor to a second rotation speed M2;
further, in the supercooling release process, when the flow rate of the capillary tube group is V2, the rotation speed of the compressor is M2, and the rotation speed of the condensing fan is S2, the cooling capacity of the refrigerating system to the instant freezing chamber 12 is maximized.
Further, S2 is the condenser fan maximum rotation speed, and M2 is the compressor maximum rotation speed.
The compressor speed is kept M2, the capillary group flow rate is kept at the second flow rate V2, and the condenser fan is kept at the second speed S2 to run together for a preset ta time to remove the supercooling.
Furthermore, the value range of S1 is 1200rpm < S1 < 1500rpm, and the value range of S2 is 1600rpm < S2 < 1900 rpm.
Further, the control method of the supercooling release process may be: after the multi-stage supercooling and cooling process is finished, the timer transmits a signal of finishing the supercooling and staged cooling process to the controller; the controller sends an instruction for reducing the flow of the capillary group to the capillary flow path control valve, and simultaneously sends an instruction for increasing the rotating speed of the condenser fan to the rotating speed adjusting device of the condenser fan; when the conditions that the flow rate of the capillary group is reduced to the preset second flow rate V2 and the rotating speed of the condenser fan is increased to the preset second rotating speed S2 are simultaneously met, the timer starts to time, and the capillary group operates at the second flow rate V2 and the condenser fan at the second rotating speed S2 together for a time ta.
This has the advantage that the supercooled state is unstable, and that a certain stimulus is required to release the supercooled state, and this stimulus may be a temperature factor or a physical factor. The invention reduces the flow of the capillary group by adjusting the flow of the capillary group through the capillary group flow path control valve, and simultaneously reduces the temperature of cold air applied to food by increasing the rotating speed of the condenser fan to increase the cold supply amount of the instant freezing chamber 2 in the supercooling release process, thereby quickly releasing the food from the supercooling state. The flow of the capillary group is changed to change the cooling capacity of the food, and the defect that the food is dehydrated and dried when the cooling capacity is increased by an air cooling method is avoided.
The cooling capacity can be increased by reducing the rotation speed of the condenser fan or reducing the flow rate of the capillary tube, but when the volume of the food placed in the instant freezing chamber is too large, the situation of insufficient cooling can exist in the instant freezing chamber at a high probability by only using a single means to relieve the overcooling state of the food. When the cooling quantity is insufficient, namely the supercooling stimulation is insufficient, the ice crystals formed in the subsequent supercooling freezing process are uneven because the temperature difference between the surface of the food and the center of the food is too large when the food is supercooled. Therefore, the supercooling freezing is simultaneously removed by two means of reducing the flow of the capillary tube and increasing the rotating speed of the fan of the condenser, the effect of removing the supercooling process of large-volume food can be further improved, and the effect of forming uniformly distributed particles in the food is promoted.
After the food is released from the overcooling state, uniform, fine and smooth ice crystals can be quickly formed to achieve the effect of instant freezing, and the formed fine ice crystals have smaller damage to tissues, fibers or cells of the food, particularly meat products, compared with large needle-shaped ice crystals formed by common freezing. The loss of nutrient substances of the food after thawing can be better avoided, and the flavor of the food can be better maintained.
Furthermore, the capillary group consists of a capillary 1 and a capillary 2, the flow V2 of the capillary 2 is less than the flow V1 of the capillary 1, V1 is more than or equal to 4.5L/min and less than or equal to 5L/min, and V2 is more than or equal to 2L/min and less than or equal to 3L/min.
Furthermore, the value range of the time ta is 0h < ta ≦ 10 h.
S03: and (3) conventional refrigeration preservation process: and recovering the fan speed of the condenser to the first fan speed S1, operating the compressor at the first speed M1, recovering the capillary flow to the first flow V1 by controlling the flow control valve of the capillary group, and controlling the instant freezing chamber to be in the normal refrigeration preservation temperature range according to the preset temperature Tc.
Further, the value range of the preset temperature Tc in the conventional refrigeration storage process is that Tc is more than or equal to minus 7 ℃ and less than 0 ℃.
Further, the method for controlling the instant freezing chamber within the conventional refrigeration preservation temperature range according to the preset temperature Tc by the conventional preservation phase chamber comprises the following steps: when the temperature of the instant freezing chamber reaches a first starting temperature point TONc, opening an air door of the instant freezing chamber; when the temperature of the instant freezing chamber reaches a first shutdown temperature point TOFFc, closing the air door of the instant freezing chamber; t isONc＝Tc+TB1/2,TOFFc＝TONc–TB2/2；TB1Indicating the floating temperature of a starting point of an instant freezing chamber in the starting process of the compressor; t isB2The temperature difference between the start and stop of the instant freezing chamber.
The method has the beneficial effect that the shelf life of the food in the supercooling process can be prolonged in the conventional refrigeration preservation. The opening and closing of the air door of the instant freezing chamber are controlled by judging the temperature of the instant freezing chamber, so that the functions of controlling the instant freezing chamber according to the preset temperature Tc and reducing energy consumption can be realized simultaneously, and the economic efficiency of the instant freezing chamber control method is improved.
As shown in fig. 8, fig. 8 is a graph of the temperature of the food stored in the instant freezing chamber as a function of time during the whole supercooling process according to the embodiment of the present invention. And (3) rapidly cooling the instant freezing chamber in the temperature range above zero in the S01A stage. The temperature of the food starts to be ready to enter the supercooled state at the low temperature region T1 slightly higher than zero. The stage S01B is a stage of supercooling, in which the temperature of the food is slowly reduced under the control of the cooling of the instant freezing chamber, the temperature of the food is lower than the freezing point of the food and is not frozen, and the food is successfully in a supercooled state. The supercooling release process of S02 in this embodiment increases the rotational speed of the condenser fan to increase the amount of cooling supplied to the flash chamber during the supercooling release process, thereby releasing the supercooled state from the temperature of the food. When the food is in the supercooling state, the food undergoes an instant freezing process, namely the temperature of the food is rapidly increased from the temperature lower than the freezing point in the supercooling state to the freezing point temperature, and the temperature of the food is maintained at the freezing point temperature for a period of time in the freezing process until the food is completely frozen. The instant freezing chamber is controlled at a preset temperature Tc during the regular refrigerated preservation at S03 such that the temperature of the food is lowered from the freezing point temperature to the Tc temperature, and the temperature of the food is maintained at substantially the Tc temperature during the subsequent regular refrigerated preservation.
Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (17)
1. A refrigerator characterized in that:
the instant freezing chamber is provided with a cooling device for providing cold energy for the instant freezing chamber and a control system for controlling the cooling device to carry out instant freezing preservation on the instant freezing chamber;
the instant freezing preservation process of the cooled object in the instant freezing chamber is realized by implementing cooling control on the instant freezing chamber;
the cooling device comprises a compressor, an evaporator, a condenser and a capillary tube group; the capillary group is formed by connecting at least two capillary pipelines with different rated flows in parallel, and the capillary group is provided with a flow path control valve so that the flow of the capillary group can be adjusted;
a condenser fan is arranged on the condenser;
the control system includes: a controller, a temperature sensor and a timer;
the instant freezing preservation comprises a multi-stage supercooling and cooling process, a supercooling relieving process and a conventional refrigeration preservation process;
the control system carries out staged cooling on the cooled object according to the preset operation target temperature and the preset operation duration of each multi-stage supercooling cooling process; in the final stage of the multi-stage supercooling and cooling process, after the preset stage cooling is completed in the preset time period, the controller simultaneously executes the following operations: controlling the flow control valve to reduce the flow of the capillary group, controlling the rotating speed of a fan of the condenser to increase, and controlling the rotating speed of the compressor to increase; and the reduced capillary flow, the increased rotating speed of the condenser fan and the increased rotating speed of the compressor are kept to run together for a time ta to remove the supercooling.
2. A method for controlling an instant freezing chamber, which performs instant freezing preservation on the instant freezing chamber by controlling a cooling device, is characterized in that:
the instant freezing preservation process of the cooled object in the instant freezing chamber is realized by implementing cooling control on the instant freezing chamber;
the instant freezing preservation process with a multi-stage supercooling and cooling process, a supercooling relieving process and a conventional refrigeration preservation process is carried out on the cooled object in the instant freezing chamber through a cooling device;
the multi-stage supercooling and cooling process comprises n cooling stages, wherein each cooling stage of the n cooling stages is provided with a preset operation target temperature and a preset operation duration; the multi-stage supercooling and cooling process carries out staged cooling on the cooled object according to a preset running target temperature and a preset running time;
in the final stage of the multi-stage supercooling and cooling process, after the preset stage cooling is completed in the preset time period, the controller simultaneously executes the following operations: controlling the flow control valve to reduce the flow of the capillary group from a first flow V1 to a second flow V2, increasing the fan speed of the condenser from a first fan speed S1 to a second fan speed S2 by the controller, and increasing the compressor speed from a first compressor speed M1 to a second compressor speed M2 by the controller;
and the supercooling is released while keeping the reduced capillary flow rate V2, the increased condenser fan rotation speed S2 and the increased compressor rotation speed M2 operating together for a time ta.
3. The instant freezer control method of claim 2, wherein: when the flow rate of the capillary group is V2, the rotating speed of the compressor is M2 and the fan of the condenser is S2 in the supercooling relieving process, the cooling capacity of the instant freezing chamber (12) supplied by the cooling device is maximum.
4. A method of controlling an instant freezer as claimed in claim 3 wherein: the value range of the preset operation ta time is that ta is more than 0h and less than or equal to 10 h.
5. The instant freezer control method of claim 4, wherein: after the multi-stage supercooling and cooling process is finished, the timer transmits a signal of finishing the supercooling and staged cooling process to the controller; the controller simultaneously sends the following operation instructions: sending an instruction for reducing the flow of the capillary group to the capillary flow path control valve, sending an instruction for increasing the rotating speed of the condenser fan to the rotating speed adjusting device of the condenser fan, and sending an instruction for increasing the rotating speed of the compressor to the rotating speed adjusting device of the compressor; when the conditions that the flow rate of the capillary group is reduced to the preset second flow rate V2, the rotating speed of the condenser fan is increased to the preset second rotating speed S2 and the rotating speed of the compressor is increased to the second rotating speed M2 of the compressor are met at the same time, the timer starts to time, and the controller controls the capillary group to operate at the second flow rate V2, the condenser fan to operate at the second rotating speed S2 of the fan and the compressor to operate at the second rotating speed M2 of the compressor for a time ta.
6. The instant freezer control method of claim 5, wherein: in the 1 st stage of the multi-stage supercooling and cooling process, the rotating speed of the compressor runs at the maximum rotating speed M2, and after the 1 st stage of the multi-stage supercooling and cooling process is finished, the compressor runs at the first rotating speed M1 in the subsequent multi-stage supercooling and cooling process.
7. The instant freezer control method of claim 6, wherein: and the n cooling stages are at least at the last cooling stage, and are stabilized at the preset target temperature for a period of time after reaching the cooling target until the preset time of the cooling process is finished.
8. The instant freezer control method of claim 7, wherein: in the process of n cooling stages in the cooling process, the n cooling stages are divided into stages 1, … … i and … … n, wherein the i cooling stage represents any one stage of the n cooling stages, i is more than or equal to 1 and less than or equal to n, n is a natural number and is more than or equal to 2, the start and stop of the air supply device are controlled according to the preset temperature of the cooling stages, namely T is used for controlling the start and stop of the air supply deviceONi＝Ti+TB1The temperature T is used as the starting temperature point of the air supply device in the ith stageoffi＝TOni-TB2[ ii ] 2 as the shutdown temperature point of the blower in the i-th stage, TB1Indicates the floating temperature T of the starting point of the instantaneous freezing chamber in the starting process of the compressorB2Temperature difference between instant freezing chamber start and stop, TOni>Ti>Toffi；
In the i-th stage:
when the storage temperature of the cooled object reaches TONi＝Ti+TB1When the pressure exceeds 2, the air supply device is controlled to work;
when the storage temperature of the cooled object reaches Toffi＝TONi-TB2And when the pressure exceeds 2, controlling the air supply device not to work.
9. The instant freezer control method of claim 8, wherein: the air supply device is a cold air supply door for implementing cold supply control of the instant freezing chamber.
10. The instant freezer control method of claim 9, wherein: the value range of the time ti for cooling control on the cooled object in the ith stage in the multi-stage supercooling and cooling process is 0h < ti is less than or equal to 8 h.
11. The instant freezer control method of claim 10, wherein: the preset target temperature of the multi-stage supercooling cooling process meets the following requirements: t1 is more than or equal to 0 ℃ at the temperature of 5 ℃; tn is more than or equal to-15 ℃, T2 is more than or equal to 0 ℃, i is more than or equal to 2 and less than or equal to n.
12. The instant freezer control method of claim 11, wherein: in the conventional refrigeration storage process, the cooled object is operated according to the preset temperature Tc, wherein Tc is more than or equal to minus 7 ℃ and less than 0 ℃.
13. The instant freezer control method of claim 12, wherein: the control method for the conventional storage process to operate according to the preset temperature Tc comprises the following steps: when the temperature of the instant freezing chamber reaches the starting temperature point TONc, opening an air door of the instant freezing chamber; when the temperature of the instant freezing chamber reaches a first shutdown temperature point TOFFc, closing the air door of the instant freezing chamber; t isONc＝Tc+TB1/2,TOFFc＝TONc–TB2/2；TB1Indicating the floating temperature of a starting point of an instant freezing chamber in the starting process of the compressor; t isB2The temperature difference between the start and stop of the instant freezing chamber.
14. The instant freezer control method of claim 13, wherein: t isB1The value range of (A) is 0 DEG C<TB1≤2℃，TB2The value range of (A) is 0 DEG C<TB2≤2℃。
15. A method of controlling an instant freezer as claimed in any one of claims 2 to 14 wherein: in the multi-stage supercooling and cooling process, in the process of performing the staged cooling on the cooled object, the flow rates of the capillary group are kept unchanged and are the first flow rate V1, and the rotating speeds of the fans of the condenser are the first rotating speed S1 of the fans.
16. The instant freezer control method of claim 15, wherein: the flow rates of the capillary group in the conventional preservation process are all first flow rates V1, the fan rotating speeds of the condenser are all first fan rotating speeds S1, and the compressor rotating speeds are all first compressor rotating speeds M1.
17. A refrigerator, characterized in that: the refrigerator comprises an instant freezing chamber (12), and the instant freezing chamber (12) adopts the instant freezing chamber control method of any one of claims 2 to 16.
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