CN110953797A - Instant freezing storage control method and refrigerator - Google Patents

Instant freezing storage control method and refrigerator Download PDF

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Publication number
CN110953797A
CN110953797A CN201911046563.3A CN201911046563A CN110953797A CN 110953797 A CN110953797 A CN 110953797A CN 201911046563 A CN201911046563 A CN 201911046563A CN 110953797 A CN110953797 A CN 110953797A
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CN
China
Prior art keywords
temperature
stage
cooling
supercooling
instant freezing
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Pending
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CN201911046563.3A
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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
Original Assignee
Gree Electric Appliances Inc of Zhuhai
Hefei Jing Hong Electrical Co Ltd
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Priority to CN201911046563.3A priority Critical patent/CN110953797A/en
Publication of CN110953797A publication Critical patent/CN110953797A/en
Pending legal-status Critical Current

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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

Abstract

The invention relates to a method for controlling instant freezing storage and a refrigerator. The instant freezing control method comprises a multi-stage supercooling and cooling process, a supercooling relieving 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 the object to be cooled. And in the multi-stage cooling and supercooling process, monitoring the temperature of the cooled object in the instant freezing chamber in real time and judging whether a preset multi-stage cooling and supercooling finishing condition is met or not, and when judging that the current temperature reaches the preset multi-stage cooling and supercooling finishing condition, starting to execute a supercooling relieving process. In the supercooling relieving process, the object to be cooled is relieved from the supercooling state through the flow of the small capillary group and the starting of the electric field generating device, so that the object to be cooled is instantly frozen, and the frozen object to be cooled is stored at the conventional refrigeration storage temperature for a long time.

Description

Instant freezing storage control method and refrigerator
Technical Field
The invention relates to a control method for instant freezing storage and a refrigeration system, in particular to a control method for instant freezing storage 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 this, the invention provides an instant freezing storage control method and a refrigeration system.
The invention relates to a method for controlling instant freezing storage and a refrigerator. The instant freezing control method comprises a multi-stage supercooling and cooling process, a supercooling relieving 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 the object to be cooled. And in the multi-stage cooling and supercooling process, monitoring the temperature of the cooled object in the instant freezing chamber in real time and judging whether a preset multi-stage cooling and supercooling finishing condition is met or not, and when judging that the current temperature reaches the preset multi-stage cooling and supercooling finishing condition, starting to execute a supercooling relieving process. In the supercooling relieving process, the object to be cooled is relieved from the supercooling state through the flow of the small capillary group and the starting of the electric field generating device, so that the object to be cooled is instantly frozen, and the frozen object to be cooled is stored at the conventional refrigeration storage temperature for a long time.
Specifically, the method comprises the following steps:
the invention provides a refrigerator, which comprises:
the instant freezing device is provided with an instant freezing chamber (12), a cooling device for providing cold for the instant freezing chamber (12) and a control system for controlling the cooling device to carry out instant freezing preservation on the instant freezing chamber;
the cooling device comprises a capillary tube set; 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;
the control system comprises a controller, a flow path control valve, a timer, a temperature sensor and an electric field generating device;
the instant freezing preservation comprises a multi-stage supercooling and cooling process, a supercooling relieving process and a conventional refrigeration preservation process;
the control system adopts staged temperature reduction according to the control multi-stage temperature reduction and supercooling process;
monitoring the temperature of the cooled object in the instant freezing chamber in real time in the multi-stage cooling and supercooling process, judging whether a preset staged supercooling and cooling completion condition is met or not, and starting to execute a supercooling relieving process when the current temperature is judged to reach the preset multi-stage supercooling and cooling completion condition;
in the supercooling relieving process, the controller controls the flow path control valve to reduce the flow of the capillary group and keeps the reduced flow for a time ta; the controller simultaneously controls the electric field generating device to be started and keeps the electric field generating device in a starting state to run for tb time; the supercooling is released by combining two means of adjusting the flow of the capillary group and applying an electric field.
The invention also provides a control method for instant freezing and storing, which comprises a multi-stage cooling and supercooling process, a supercooling release process and a conventional refrigeration and storage process, and is characterized in that: monitoring the temperature of the cooled object in the instant freezing chamber in real time in the multi-stage cooling and supercooling process, judging whether a preset staged supercooling and cooling completion condition is met or not, and starting to execute a supercooling relieving process when the current temperature is judged to reach the preset multi-stage supercooling and cooling completion condition;
during the supercooling release process: and controlling the flow path control valve to reduce the flow rate of the capillary group from the first flow rate V1 to the second flow rate V2, keeping the second flow rate V2 running for a preset ta time and simultaneously controlling the electric field generating device to be started, and ensuring that the electric field generating device runs for tb time in a started state until the cooled object is completely frozen.
Preferably, the multi-stage cooling and supercooling process adopts staged cooling;
continuously collecting the real-time temperature Tn of the cooled object at a preset time interval delta t from a preset time t1 after the staged temperature reduction process starts, and comparing the real-time temperature Tn of the cooled object obtained at the Tn-th time with the temperature Tn-1 of the cooled object monitored before the preset time interval delta t;
the supercooling release is executed if △ T ≧ 0 (Tn-1).
Preferably, if △ T is (Tn-1) <0, continuously determining whether the detection time Tn is greater than or equal to the multi-stage temperature reduction and supercooling process time maximum threshold value ts;
and if tn is larger than or equal to ts, the supercooling removing process operation is carried out.
Preferably, if tn < ts, the supercooling process is continuously performed.
Preferably, the value range of the preset time interval delta t for acquiring the real-time temperature of the cooled object is more than 0 and less than or equal to 2 min.
Preferably, the preset time t1 is set after the 1 st stage of the multi-stage temperature-reducing and supercooling process.
Preferably, the multi-stage cooling and supercooling process time maximum threshold value ts is the time required by the cooled object to achieve sufficient supercooling, and the value range of ts is 0 < ts ≦ 10 h.
Preferably, the instant freezing storage process of the cooled object in the instant freezing chamber (12) is realized by implementing cooling control to the instant freezing chamber (12); the temperature regulating device of the instant freezing chamber (12) is an air supply device.
Preferably, the multi-stage cooling comprises n stages, each stage of the multi-stage cooling process is controlled by an air supply device for implementing air cooling according to the preset temperature Tn of the cooling stage, the air supply device is arranged in the instant freezing chamber (12), the n cooling stages are divided into 1 st, … … i, … … th stages, wherein the ith cooling stage represents any 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, n is more than or equal to 2, and all limits on any stage are replaced by the ith stage, namely:
in the ith cooling stage, an air supply device for air cooling the instant freezing chamber (12) is controlled according to the preset temperature Ti; i.e. with TONi＝Ti+TB1The temperature T is used as the starting temperature point of the air supply device in the ith stageoffi＝TONi-TB2[ ii ] 2 as the shutdown temperature point of the blower in the i-th stage, TB1Indicates the floating temperature T of the starting point of the instantaneous freezing chamber in the starting process of the compressorB2Temperature difference between instant freezing chamber start and stop, TONi>Ti>Toffi。
Preferably, the instant freezing storage control method comprises the following steps:
when the storage temperature of the instant freezing chamber reaches TONi＝Ti+TB1When the pressure exceeds 2, the air supply device is controlled to work;
when the storage temperature of the instant freezing chamber reaches Toffi＝TONi-TB2And when the pressure exceeds 2, controlling the air supply device not to work.
Preferably, TB1The value range of (A) is 0 DEG C<TB1≤2℃，TB2The value range of (A) is 0 DEG C<TB2≤2℃。
Preferably, a 1 st cooling stage exists before the preset time T1, the preset temperature of the 1 st cooling stage is T1, the compressor is controlled to operate at a second rotation speed M2 in the 1 st cooling stage, after the 1 st cooling stage is completed, the rotation speed of the compressor is adjusted to operate at a rotation speed M1 which is lower than M2, and M2> M1.
Preferably, the temperature of 5 ℃ is not less than T1 and is more than 0 ℃ in the first cooling stage of the multi-stage cooling and cooling process; in the supercooling release process, the value range of the time ta is 0h < ta < 10 h.
Preferably, in the multi-stage cooling and supercooling process, the capillary group always keeps the flow rate of the capillary group to be the first flow rate V1, and the electric field generating device is in a closed state; when the supercooling releasing process is executed, the flow path control valve is controlled to reduce the flow rate of the capillary group to a second flow rate V2, and the electric field generating device is controlled to be opened, wherein the second flow rate V2 of the capillary group is the minimum value in a certain range.
Preferably, the electric field generating device can control the instant freezing chamber to generate an electrostatic field or an alternating electric field.
Preferably, the capillary array is maintained at a first flow rate V1 throughout the conventional cryopreservation process, the compressor is operated at a first speed M1, and the electric field generating device is in an off state.
Preferably, in the conventional refrigeration storage process, the cooled object is subjected to refrigeration control, so that the cooled object runs at a preset temperature Tc of-7 ℃ to Tc <0 ℃.
Preferably, the control method for the regular storage stage to operate according to the preset temperature Tc comprises the following steps: when the temperature of the instant freezing chamber (12) reaches the starting temperature point TONc, opening a cold air supply door of the instant freezing chamber (12); when the temperature of the instant freezing chamber reaches a first shutdown temperature point TOFFc, closing a cold air supply 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 invention also provides a refrigerator which is provided with the control system for realizing the instant freezing storage control method. The refrigerator comprises an instant freezing chamber, and the instant freezing chamber adopts the instant freezing control method to store the cooled object in an instant freezing mode.
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 embodiment 1 of the present invention;
FIG. 2 is a diagram of a refrigeration system of embodiment 1 of the present invention;
FIG. 3 is a refrigeration flow diagram in embodiment 1 of the present invention;
FIG. 4 is a structural view of a refrigerator according to embodiment 1 of the present invention;
FIG. 5 is a schematic view of a controller according to embodiment 1 of the present invention;
FIG. 6 is a schematic view of an instant freezing functional area according to embodiment 1 of the present invention;
FIG. 7 is a control logic diagram of embodiment 2 of the present invention;
in the figure:
refrigerator-10; a refrigerating chamber-11; instant freezing chamber-12; freezing chamber-13; an electric field generating device power supply section-14;
a 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; -35 infrared sensor; a frequency conversion plate-36; timer-37; electric field generating means-38;
instant freezing functional zone-120; an electric field generating device discharge plate portion-121;
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 following detailed description of embodiments of the invention is provided in conjunction with the accompanying figures 1-6:
fig. 2 shows a refrigeration system according to the present embodiment, which 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 pipeline component 220, the air return heat exchange section 221, the compressor 23, the condenser 24, the condensation preventing pipe 25, the drying filter 26 and the capillary tubes 1-271; capillary 2-272.
As shown in fig. 3, the refrigerant flow direction when the refrigeration system is in operation is: compressor 23 → condenser 24 → anti-condensation tube 25 → filter drier 26 → capillary tube 1-271 or capillary tube 2-272 → refrigerated evaporator 21 → air return tube assembly 220 → compressor 23.
As shown in fig. 4, the refrigeration system for executing any control method of the present invention may be a refrigerator including a refrigerating compartment 11, a flash freezing compartment 12, and a freezing compartment 13, and the electric field generating device power supply section 14 has a control system in the refrigerator according to this embodiment, which enables the refrigerator to perform a flash freezing storage control process for a cooled object placed in the flash freezing compartment 12.
The present embodiment further provides a control system capable of executing the instant frozen storage control method of the present invention, including: the control system comprises a controller 31, a display 32, a compressor 23, a temperature adjusting device 34, a temperature sensor 33, an infrared sensor 35, a frequency conversion plate 36, a timer 37, an electric switching valve 28 and an electric field generating device 38, wherein the controller 31 is respectively in control connection with the display 32, the temperature adjusting device 34, the temperature sensor 33, the infrared sensor 35, the frequency conversion plate 36, the timer 37, the electric switching valve 28 and the electric field generating device 38 to control the rotating speed of the compressor, and the control system is used for executing an instant freezing control method.
Further, the controller 31 in the control system sends a compressor rotation speed adjusting instruction to the frequency conversion board 36, and the frequency conversion board 36 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 an air supply device, which is a cooling air door of the instant freezing chamber.
Further, the temperature sensor 33 is used for detecting the temperature of the instant freezing chamber and transmitting the temperature information of the instant freezing chamber to the controller 31.
Further, the infrared sensor 35 is used for detecting the temperature of the surface of the food, the timer is used for monitoring the timing of the time interval Δ T of the surface temperature of the food, the infrared sensor 35 transmits the temperature information of the surface of the food at the time Tn to the controller 31, the controller 31 judges that △ T ≧ Tn-1 ≧ 0, and an instruction for continuing the supercooling and cooling process or the supercooling release process is given.
As shown in fig. 6, the instant freezing chamber includes an instant freezing storage area box 121, an electric field generating device discharge plate portion 122, a temperature sensor 33, and an infrared sensor 35. The electric field generating apparatus discharging plate part 122 is provided at the bottom of the instant freezing storage region case 121 in this embodiment.
As shown in fig. 6, the schematic structural diagram of the instant freezing chamber in fig. 6 shows the position of the device of the present embodiment partially arranged in the instant freezing chamber. The discharge plates provided in the flash chamber may be one discharge plate as shown in fig. 6 or two or more discharge plates. The discharge plate of the electric field generating device can be arranged at the bottom of the instant freezing chamber and can also be arranged at the periphery or the top of the instant freezing chamber. The high-voltage part of the power supply of the electric field generating device is placed on the top of the refrigerator or the back of the refrigerator. As long as the refrigerating performance of the whole machine is not influenced, the placing position has no special requirement.
Further, fig. 6 is only one structural arrangement of the instant freezing chamber of the present invention, and in order to highlight the arrangement of the discharge plate, fig. 6 shows only part of the instant freezing chamber, and the instant freezing chamber structure shown in fig. 6 should not be understood as the only structure of the instant freezing chamber described in the present invention.
Example 1
The instant freezing storage control method according to the present embodiment will be described below.
As shown in fig. 1, an instant freezing control method includes the following steps:
s01: a multi-stage cooling and supercooling process:
n cooling stages are arranged in the stage cooling and supercooling process and are divided into the 1 st stage, … … i stage and the … … th stage, wherein the ith cooling stage represents any one stage of the n cooling stages, i is more than or equal to 1 and less than or equal to n, n is a natural number and is more than or equal to 2, and all the following limits on any one stage are replaced by the ith stage.
S01A: 1, cooling stage: the instant freezing chamber 12 is controlled by the control device to operate at the preset temperature T1 for T1 time, the compressor operates at the second rotating speed M2 during T1 time, and the timer 37 performs timing within the time period T1. After the step S01A is finished, the compressor rotation speed is controlled to be reduced from the second rotation speed M2 to the first rotation speed M1.
The beneficial effects are that: when the object to be cooled needs to be cooled, the rotating speed of the compressor is increased, so that the cooling capacity is increased, the cooling rate of the instant freezing chamber is increased, the object to be cooled is enabled to be more quickly stabilized in the temperature vicinity of T1, and the early preparation time for the object to be cooled to enter the overcooling state is shortened. The 1 st temperature reduction stage controls the instantaneous freezing chamber to operate according to the preset temperature T1, so that the temperature of the instantaneous freezing chamber is favorably kept in a small range temperature interval containing the temperature T1, the overall temperature of the instantaneous freezing chamber is favorably and uniformly reduced in the subsequent multi-stage supercooling and temperature reduction process, the temperature difference between the surface and the inside of the cooled object placed in the instantaneous freezing chamber is smaller, and the cooled object is favorably and smoothly enters a supercooling state in the subsequent staged temperature reduction process.
Furthermore, T1 is more than 0 ℃ at the temperature of 5 ℃ or more, and T1 is more than 0h at the temperature of 8h or more.
Further, before step S01, the method further includes the steps of: aS 01: the user selects the instant freeze function.
Further, the refrigerator performing the instant frozen storage control method of the present embodiment is equipped with the display 32, the user can select the instant frozen storage function on the display 32 as desired, and the instant freezing chamber 12 starts to perform the step S01 when the user selects the function.
S01B: and after the step S01A is finished, the compressor is operated at a first rotating speed M1, in the S01 multi-stage cooling and supercooling process, the flow rate of the capillary group is kept to be V1, the electric field generating device is kept in a closed state, and the rotating speed M2 of the compressor is greater than M1. The method has the advantages that the rotating speed of the compressor at the S01B stage is recovered to M1, and the cooling capacity can be reduced by reducing the rotating speed of the compressor. When the cooled food enters the overcooling state, the slow cooling rate and the low cooling capacity are needed, so that the effect that the cooled food successfully enters the overcooling state and is not easily released from the overcooling state can be realized, and therefore, the effect can be realized by reducing the rotating speed of the compressor.
Further, S01B is a single or multi-stage cooling process.
Further, in this embodiment, S01B is a single-stage cooling process. The control system controls the instant freezing chamber 12 to operate at T2 according to the preset temperature T2, and the timer counts time at the stage.
Furthermore, T2 is more than or equal to 0 ℃ at the temperature of 2 ℃, and T2 is more than or equal to 0h for 8 h.
S01C, when the temperature reduction step of S01B is finished, the controller controls the instant freezing chamber 12 to operate according to the preset Td temperature, the surface temperature of the food is monitored in real time by the infrared sensor 35 in the instant freezing functional area in the operation process of the instant freezing chamber 12 according to the preset Td temperature, the real-time temperature of the cooled object is continuously collected at the preset time interval delta t, and the real-time temperature Tn of the cooled object obtained at the Tn-th time is compared with the temperature Tn-1 of the cooled object monitored before the preset time interval delta t;
if △ T is equal to (Tn-Tn-1) or more than 0, the supercooling process operation is released;
if △ T is equal to (Tn-Tn-1) <0, the instant freezing chamber 12 continues to operate at the predetermined Td temperature.
Furthermore, the food temperature can be detected in various ways, and the temperature inside the food can also be detected, and the infrared sensor used as the detection device for the food temperature in the embodiment should not be construed as limiting the only means for realizing the food temperature detection in the present invention.
Furthermore, the maximum time threshold ts of the multi-stage cooling and supercooling process is the time for ensuring that the food in the instant freezing chamber 12 can be fully supercooled, and ts is more than 0 and less than or equal to 10 h.
Further, the Td temperature is preset as the supercooling critical temperature of the food, and when the food in the supercooled state is cooled until the Td temperature reaches the food supercooling critical temperature point, that is, the food cannot be kept in the supercooled state at the Td temperature or below, including the Td temperature, regardless of the control means, the food in the supercooled state starts nucleation at the Td temperature, and the supercooled state of the food is rapidly released in a very short time. The food in the supercooled state is nucleated at the Td temperature and then undergoes a crystal freezing phenomenon, and the temperature of the food is changed such that the temperature rises to the freezing point temperature instantly after the Td temperature is reached, and the freezing point temperature is maintained substantially constant during freezing.
Further, in the embodiment, the surface temperature of the food is monitored and judged in real time, and when △ T is equal to or more than (Tn-Tn-1) and equal to or more than 0, the supercooling release operation is executed, so that the beneficial effects are that when the Td (supercooling critical temperature point) is reached, the food immediately carries out spontaneous supercooling release, namely, rapid nucleation and crystallization are carried out.
Furthermore, Td is more than or equal to-10 ℃ at the temperature of 0 ℃, and T1 is more than T2 is more than Td.
The multi-stage cooling process comprises n cooling stages, wherein each cooling stage of the n cooling stages implements cooling control on an object to be cooled, and in the cooling control, an air supply device implementing air cooling is controlled according to a preset temperature Tn of the cooling stage;
during the control process of air cooling 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 12 in the starting process of the compressorB2Temperature difference between instant freezing chamber start and stop, TONi>Ti>Toffi。
In the i-th stage:
when the storage temperature of the instant freezing chamber reaches TONi＝Ti+TB1When the pressure exceeds 2, the air supply device is controlled to work;
when the storage temperature of the instant freezing chamber reaches Toffi＝TONi-TB2And when the pressure exceeds 2, controlling the air supply device not to work.
Furthermore, the value range of the time ti for cooling control on the cooled object in the ith stage in the multi-stage supercooling and cooling process is 0h < ti is less than or equal to 8 h. The beneficial effects are that: the control of the cooling time tn is implemented through the timing device in each cooling stage, which is beneficial to reducing the temperature difference between the surface and the inside of the cooled object in each cooling stage, increasing the success probability of the overcooling of the cooled object and avoiding that the cooled object which enters the overcooling state can easily release the overcooling state in advance.
Further, TB1And TB2The value range of the time ti for carrying out cooling control on the cooled object in the ith stage in the multi-stage supercooling and cooling process is 0h for known parameters<ti≤8h。
Further, the air supply device is controlled to control a cold air supply door of the instant freezing chamber 12.
Further, the cold air supply door of the instant freezing chamber 12 is provided with a baffle plate 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.
S02: supercooling release process: the control device issues a command to end the multi-stage cooling and subcooling process and also issues a command to start the subcooling removal process to the refrigeration system that implements the instant freezing storage control method.
The refrigerating system for implementing the instant freezing storage control method comprises a capillary group, wherein the capillary group is formed by connecting at least two capillaries with different rated flows in parallel, and one end of a refrigerant entering the capillary group is provided with a capillary group flow path control valve.
The instruction to start the supercooling release process triggers the capillary group flow path control valve, which controls the capillary group flow rate to decrease to the second flow rate V2. The capillary set is controlled to run at a second flow rate V2 for a time ta. The compressors are all operated at the first speed M1 during the subcooling-removing stage.
The instruction of the start of the supercooling release process triggers the switch of the electric field generating device at the same time, the electric field generating device is started, the food temperature detecting device of the instant freezing chamber 12 transmits the temperature signals of the food stored in the instant freezing chamber, including the surface temperature and the internal temperature of the food, to the controller in real time, the controller obtains different phase change stages of the supercooling release process of the food through analyzing and processing the temperature signals, and then the controller adjusts the type, the strength, the frequency and other related parameters of the electric field generated by the electric field generating device according to the analyzed and processed temperature signals of the instant freezing chamber.
The beneficial effects are that: the supercooled state is an unstable state, and a certain stimulus is required to release the supercooled state, and such a stimulus may be a temperature factor or a physical factor. On one hand, the flow of the capillary group is adjusted by the capillary group flow path control valve, so that the flow of the capillary group is reduced, the temperature of cold air applied to food is reduced, and the cold supply amount of the instant freezing chamber 2 in the stage of supercooling release is increased. On the other hand, different electric field types are applied to the food supercooling relieving process, and different electric field strengths and electric field frequencies are adjusted, so that the electric field can play different roles in different stages in the whole food supercooling relieving process. If the supercooling stage is just released to promote the nucleation, the growth of the ice crystals is inhibited in the ice crystal growth stage, and the bacteriostasis effect is also achieved. The flow of the capillary group is adjusted and the electric field is applied to the instant freezing chamber, so that the time for releasing the overcooling state of the food can be shortened, the overcooling state of the food can be released more easily, and the formed ice crystals are distributed more uniformly. The flow of the capillary group is changed in the instant freezing chamber, and the electric field is additionally arranged to change the cooling capacity of the food, so that the defect that the food is dehydrated and dried when the cooling capacity is increased by an air cooling means is overcome.
After the food is released from the overcooling state, uniform, fine and smooth ice crystals can be quickly formed to achieve the effect of instant freezing, and the formed fine ice crystals have smaller damage to tissues, fibers or cells of the food, particularly meat products, compared with large needle-shaped ice crystals formed by common freezing. The food thawing agent can better avoid the loss of nutrient substances of food after thawing and better maintain the flavor of the food.
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.
Further, after the capillary group flow rate was reduced to V2, the capillary group flow rate was controlled to maintain V2 for a time ta.
Furthermore, the value range of the time ta is 0h < ta ≦ 10 h.
Further, after the electric field generating device is started, the electric field is controlled to keep on and run for tb time.
Furthermore, the value range of the time tb is 0h < tb ≦ 10 h.
S03: and (3) a conventional refrigeration preservation stage: the flow rate of the capillary group is recovered to a first flow rate V1, the electric field generating device is in a closed state, the compressors are all operated at a first rotating speed M1, and the instant freezing chamber is controlled within a normal refrigeration preservation temperature range according to a preset temperature Tc.
Further, the value range of the preset temperature Tc in the conventional refrigeration storage stage is that Tc is more than or equal to minus 7 ℃ and less than 0 ℃.
Further, the method for controlling the instant freezing chamber in the conventional refrigeration preservation temperature range according to the preset temperature Tc by the conventional preservation stage instant freezing chamber comprises the following steps: when the temperature of the instant freezing chamber reaches a first starting temperature point TONc, opening a cooling air door of the instant freezing chamber; when the temperature of the instant freezing chamber reaches a first shutdown temperature point TOFFc, closing a cold air supply 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 supply cooling door of the instant freezing chamber 12 are controlled by judging the temperature of the instant freezing chamber 12, 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 control method is improved.
It should be noted that:
the embodiment illustrated in FIG. 7 is an example of an operation to perform a supercooling release when the temperature decrease stage 3 is monitored to △ T ≧ 0 (Tn-Tn-1). As will be appreciated by those skilled in the art, stage 4 or other stages are also possible.
However, it is more valuable to monitor the temperature after the first stage, because the temperature in the freezing chamber is higher at the beginning of the first stage, and the temperature of the object to be cooled takes a longer time to decrease to the critical point.
Example 2:
the embodiment is a further optimized implementation manner of embodiment 1, and details of the embodiment are described with reference to fig. 7:
in this embodiment, the judgment of the time of the supercooling process of the food is added to the judgment of the temperature of the food in the step S01C on the basis of the embodiment 1, and the judgment module of the time of the supercooling process of the food is executed, so that the supercooling state of the food can be forcibly released when the food is supercooled sufficiently in the tn period, the energy consumption of the refrigerator implementing the instant freezing control process can be reduced, and the instant freezing storage of the food can be performed more quickly
This embodiment is the same as the supercooling release process and the normal refrigeration storage process described in embodiment 1, and has the difference that: in the step S01C of the multi-stage temperature reduction and supercooling process, after the step S01B is finished, the controller controls the instant freezing chamber 12 to operate according to the preset Td temperature, monitors the surface temperature of the food in real time through the infrared sensor 35 in the instant freezing functional area in the process that the instant freezing chamber 12 operates according to the preset Td temperature, continuously collects the real-time temperature of the cooled object at the preset time interval delta t, and compares the real-time temperature Tn of the cooled object obtained at the Tn-th time with the temperature Tn-1 of the cooled object monitored before the preset time interval delta t;
if △ T is equal to (Tn-Tn-1) or more than 0, the supercooling process operation is released;
if △ T is (Tn-Tn-1) <0, continuing to judge the Tn time, and continuing to judge whether the detection time Tn is within the range of the maximum threshold ts of the multi-stage cooling and supercooling process time;
if tn < ts, the supercooling release process is not performed, and the instant freezing chamber continues to perform the step S01C, that is, the controller controls the instant freezing chamber 12 to operate at the preset Td temperature.
And if tn is larger than or equal to ts, executing the supercooling release operation.
Furthermore, the maximum time threshold ts of the multi-stage cooling and supercooling process is the time for ensuring that the food in the instant freezing chamber 12 can be fully supercooled, and ts is more than 0 and less than or equal to 10 h.
The method has the advantages that the monitoring of the internal temperature of the food is a technical difficulty, particularly when the food is placed in a relatively large cooling space, the instant temperature rise of the food cannot cause the obvious change of the monitoring temperature of a temperature sensor, on the other hand, the non-contact temperature measurement can be influenced by the environment, and in order to avoid the problems of overlong supercooling time and overlong supercooling freezing process caused by monitoring errors caused by temperature monitoring, a supercooling forcible release program for time judgment is added, namely, even if △ T (Tn-Tn-1) <0 does not occur, ts is the maximum threshold value of the supercooling time, the supercooling release operation is forcibly carried out as long as Tn is not less than ts.
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 (20)

1. A refrigerator characterized in that:
the instant freezing device is provided with an instant freezing chamber (12), a cooling device for providing cold for the instant freezing chamber (12) and a control system for controlling the cooling device to carry out instant freezing preservation on the instant freezing chamber;
the cooling device comprises a capillary tube set; 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;
the control system comprises a controller, a flow path control valve, a timer, a temperature sensor and an electric field generating device;
the instant freezing preservation comprises a multi-stage supercooling and cooling process, a supercooling relieving process and a conventional refrigeration preservation process;
the control system adopts staged temperature reduction according to the control multi-stage temperature reduction and supercooling process;
monitoring the temperature of the cooled object in the instant freezing chamber in real time in the multi-stage cooling and supercooling process, judging whether a preset staged supercooling and cooling completion condition is met or not, and starting to execute a supercooling relieving process when the current temperature is judged to reach the preset multi-stage supercooling and cooling completion condition;
the supercooling relieving process is realized by combining two means of adjusting the flow of the capillary group and applying an electric field: the controller controls the flow path control valve to reduce the flow of the capillary group and keeps the reduced flow for a time ta; the controller simultaneously controls the electric field generating device to be turned on and keeps the electric field generating device in an on state for running tb until the cooled object is completely frozen.
2. A method for controlling instant freezing and storing comprises a multi-stage cooling and supercooling process, a supercooling relieving process and a conventional refrigerating and storing process, and is characterized in that: monitoring the temperature of the cooled object in the instant freezing chamber in real time in the multi-stage cooling and supercooling process, judging whether a preset staged supercooling and cooling completion condition is met or not, and starting to execute a supercooling relieving process when the current temperature is judged to reach the preset multi-stage supercooling and cooling completion condition;
during the supercooling release process: and controlling the flow path control valve to reduce the flow rate of the capillary group from the first flow rate V1 to the second flow rate V2, keeping the second flow rate V2 running for a preset ta time and simultaneously controlling the electric field generating device to be started, and ensuring that the electric field generating device runs for a tb time in a started state until the cooled object is completely frozen.
3. The instant frozen storage control method according to claim 2, characterized in that: the multi-stage cooling and supercooling process adopts staged cooling;
continuously collecting the real-time temperature Tn of the cooled object at a preset time interval delta t from a preset time t1 after the staged temperature reduction process starts, and comparing the real-time temperature Tn of the cooled object obtained at the Tn-th time with the temperature Tn-1 of the cooled object monitored before the preset time interval delta t;
the supercooling release is executed if △ T ≧ 0 (Tn-1).
4. The method according to claim 3, wherein if △ T is (Tn-Tn-1) <0, continuing to determine whether the detection time Tn is greater than or equal to the multi-stage supercooling and cooling process time maximum threshold ts;
and if tn is larger than or equal to ts, the supercooling removing process operation is carried out.
5. The instant freezing storage control method according to claim 4, wherein: if tn < ts, the subcooling process continues.
6. The frozen-in storage control method according to claim 5, characterized in that: the value range of the preset time interval delta t for collecting the real-time temperature of the cooled object is more than 0 and less than or equal to 2 min.
7. The instant frozen storage control method according to claim 6, characterized in that: the preset time t1 is set after the 1 st stage of the multi-stage temperature-reducing and supercooling process.
8. The instant frozen storage control method according to claim 7, characterized in that: the maximum time threshold ts of the multi-stage cooling and supercooling process is the time required by the cooled object to be fully supercooled, and the value range of ts is more than 0 and less than or equal to 10 h.
9. The frozen-in storage control method according to claim 8, characterized in that: the instant freezing storage process is carried out on the cooled object in the instant freezing chamber (12), and the instant freezing chamber (12) is controlled to supply cold; the control of the cooling of the instant freezing chamber (12) is an air supply device.
10. The instant frozen storage control method according to any one of claim 9, characterized in that: the multi-stage cooling comprises n stages, each stage of the multi-stage cooling process is used for controlling an air supply device for implementing air cooling according to the preset temperature Tn of the cooling stage, the air supply device is arranged in the instant freezing chamber (12), the n cooling stages are divided into 1 st, … … i and … … th stages, wherein the ith cooling stage represents any 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 more than or equal to 2, all limits on any stage are replaced by the ith stage, namely:
in the ith cooling stage, an air supply device for air cooling the instant freezing chamber (12) is controlled according to the preset temperature Ti; i.e. with TONi＝Ti+TB1The temperature T is used as the starting temperature point of the air supply device in the ith stageoffi＝TONi-TB2[ ii ] 2 as the shutdown temperature point of the blower in the i-th stage, TB1Indicates the floating temperature T of the starting point of the instantaneous freezing chamber in the starting process of the compressorB2Temperature difference between instant freezing chamber start and stop, TONi>Ti>Toffi。
11. The instant frozen storage control method according to claim 10, characterized in that:
in the i-th stage:
when the storage temperature of the instant freezing chamber reaches TONi＝Ti+TB1When the pressure exceeds 2, the air supply device is controlled to work;
when the storage temperature of the instant freezing chamber reaches Toffi＝TONi-TB2And when the pressure exceeds 2, controlling the air supply device not to work.
12. The instant frozen storage control method according to claim 11, characterized in that: t isB1The value range of (A) is 0 DEG C<TB1≤2℃，TB2The value range of (A) is 0 DEG C<TB2≤2℃。
13. The instant frozen storage control method according to claim 12, characterized in that:
the method comprises the following steps that a 1 st cooling stage exists before the preset time T1, the preset temperature of the 1 st cooling stage is T1, the compressor is controlled to operate at a second rotating speed M2 in the 1 st cooling stage, after the 1 st cooling stage is completed, the rotating speed of the compressor is adjusted to operate at a rotating speed M1 lower than M2, and M2 is larger than M1.
14. The flash freezing control method according to claim 13, wherein: the temperature of 5 ℃ or more and T1 is more than or equal to 0 ℃ in the first temperature reduction stage of the multi-stage temperature reduction and supercooling process; in the supercooling release process, the value range of the time ta is 0h < ta < 10 h.
15. The frozen-in storage control method according to claim 14, wherein: in the multi-stage cooling and supercooling process, the capillary group always keeps the flow as a first flow V1 to operate, and the electric field generating device is in a closed state; when the supercooling releasing process is executed, the flow path control valve is controlled to reduce the flow rate of the capillary group to a second flow rate V2, and the electric field generating device is controlled to be opened, wherein the second flow rate V2 of the capillary group is the minimum value in a certain range.
16. The instant frozen storage control method according to claim 17, characterized in that: the electric field generating device can control the instant freezing chamber to generate an electrostatic field or an alternating electric field.
17. The frozen-in storage control method according to claim 16, wherein: the capillary group is always kept in the first flow V1 operation during the whole normal refrigeration preservation process, the compressor is operated at the first rotating speed M1, and the electric field generating device is always in the closed state.
18. The instant frozen storage control method according to claim 17, characterized in that: in the conventional refrigeration storage process, the cooled object is subjected to refrigeration control, so that the cooled object runs at a preset temperature Tc of-7 ℃ to Tc less than 0 ℃.
19. A flash freeze control method according to claim 18, wherein: said conventional storage phase operating at a preset temperature TcThe control method comprises the following steps: when the temperature of the instant freezing chamber (12) reaches the starting temperature point TONc, opening a cold air supply door of the instant freezing chamber (12); when the temperature of the instant freezing chamber reaches a first shutdown temperature point TOFFc, closing a cold air supply 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.
20. A refrigerator with instant freezing and storing functions is provided with an instant freezing chamber (12), a refrigerating system and a control system, and is characterized in that: the control system controls the cooling device to realize the instant freezing function of the instant freezing chamber by adopting the control method of any one of claims 2 to 19.
CN201911046563.3A 2019-10-30 2019-10-30 Instant freezing storage control method and refrigerator Pending CN110953797A (en)

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Application publication date: 20200403