WO2018223948A1 - Procédé de décongélation pour appareil de décongélation - Google Patents

Procédé de décongélation pour appareil de décongélation Download PDF

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Publication number
WO2018223948A1
WO2018223948A1 PCT/CN2018/089912 CN2018089912W WO2018223948A1 WO 2018223948 A1 WO2018223948 A1 WO 2018223948A1 CN 2018089912 W CN2018089912 W CN 2018089912W WO 2018223948 A1 WO2018223948 A1 WO 2018223948A1
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WIPO (PCT)
Prior art keywords
defrosting
thawing
radio frequency
generating module
impedance
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Application number
PCT/CN2018/089912
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English (en)
Chinese (zh)
Inventor
徐同
朱小兵
李鹏
王铭
戴建斌
Original Assignee
青岛海尔股份有限公司
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Application filed by 青岛海尔股份有限公司 filed Critical 青岛海尔股份有限公司
Publication of WO2018223948A1 publication Critical patent/WO2018223948A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/46—Dielectric heating
    • H05B6/62—Apparatus for specific applications
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B4/00—General methods for preserving meat, sausages, fish or fish products
    • A23B4/06—Freezing; Subsequent thawing; Cooling
    • A23B4/07—Thawing subsequent to freezing
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/36—Freezing; Subsequent thawing; Cooling
    • A23L3/365—Thawing subsequent to 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
    • 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

Definitions

  • the present invention relates to the field of thawing, and in particular to a thawing method for a thawing apparatus.
  • the quality of the food is maintained during the freezing process, but the frozen food needs to be thawed before processing or eating.
  • the prior art generally thaws food by providing a heating device or a microwave device in the refrigerator.
  • the thawed food by the heating device generally requires a long thawing time, and the thawing time and temperature are difficult to grasp, which easily causes the water evaporation and juice loss of the food, and the quality of the food is lost; the food is thawed by the microwave device.
  • Fast and efficient so the nutrient loss of food is very low, but due to the difference in the penetration and absorption of water and ice by microwave, and the internal distribution of food is uneven, the melted area absorbs more energy and is prone to thaw. Uneven and local overheating problems.
  • a thawing method for a thawing device that has high thawing efficiency, uniform thawing, and food quality.
  • a further object of the first aspect of the invention is to improve the thawing efficiency of the refrigerator.
  • Another further object of the first aspect of the invention is to prevent the object to be treated from being decomposed.
  • a defrosting method for a thawing apparatus comprising a cylinder defining a defrosting chamber for placing a workpiece to be processed and having a forward opening, a device door for opening and closing the defrosting chamber at the forward opening of the defrosting chamber, a radio frequency generating module, respectively disposed horizontally at a top wall and a bottom wall of the defrosting chamber, respectively An upper electrode plate and a lower electrode plate electrically connected to the radio frequency generating module, a tray disposed in the defrosting chamber for carrying the object to be processed, and a tray disposed on the tray for sensing the to-be-processed a load cell for the weight of the object;
  • the thawing method includes:
  • the load cell senses a weight of the object to be processed
  • the thawing method for the thawing device further includes:
  • the radio frequency generating module starts to work
  • the radio frequency generating module does not work.
  • the thawing method for the thawing device further includes:
  • the operating power of the radio frequency generating module is 75 to 95% of the rated power
  • the operating power of the radio frequency generating module is rated power
  • the first weight threshold is greater than zero, the first weight threshold is less than the second weight threshold, the second weight threshold is less than the third weight threshold, and the preset range is greater than or equal to the first The weight threshold is less than or equal to the third weight threshold.
  • the thawing method for the thawing device further includes:
  • a visual and/or audible signal is sent to alert the user to no load
  • a visual and/or audible signal is sent to alert the user to overload.
  • the thawing device further includes a detecting module configured to detect an incident wave signal and a reflected wave signal connecting the electrical connection between the radio frequency generating module and the upper electrode plate;
  • the defrosting method includes :
  • the radio frequency generating module When the radio frequency generating module is in an active state, detecting an incident wave signal and a reflected wave signal of the electrical connection;
  • the thawing device further includes a load compensation module, the load compensation module includes a compensation unit disposed in series with the object to be processed, and a motor for increasing or decreasing an impedance of the compensation unit;
  • the thawing method further includes:
  • the load compensation module does not work.
  • the thawing method for the thawing device further includes:
  • the step of determining the thawing progress of the to-be-processed object includes:
  • the current working power of the radio frequency generating module is reduced by 30% to 40%;
  • the radio frequency generating module stops working.
  • a defrosting method for a refrigerator including a casing defining at least one accommodating space, a compartment door body for opening and closing the accommodating space, respectively, and A defrosting device for the accommodating space, the thawing method comprising the defrosting method for the defrosting device according to any of the above.
  • the refrigerator further includes a defrosting switch, and the defrosting switch is disposed on any of the compartment door bodies for controlling start-stop of the defrosting program; wherein the defrosting method for the refrigerator comprises:
  • the weighing sensor stops working.
  • the invention determines the working power of the radio frequency generating module by the weight of the object to be treated, has better thawing effect, and avoids unnecessary energy waste.
  • the invention reminds the user of the no-load when the weight of the object to be treated is too small, thereby avoiding the occurrence of the "air-burning" phenomenon, that is, avoiding the work of the radio frequency generating module under no-load, and reducing the failure rate of the freezing device. And avoid undesired energy consumption.
  • the weight of the object to be treated is too large, the user is reminded of the overload, and the phenomenon that the temperature difference is excessively reduced (greater than 3 ° C) due to excessive temperature difference between the inside and the outside of the object to be treated is avoided.
  • the present invention further improves the waiting for the difference between the load impedance and the output impedance of the radio frequency generating module by a load compensation module within a predetermined range (greater than or equal to a first impedance threshold and less than or equal to a second impedance threshold). The thawing efficiency of the treatment.
  • the present invention determines the rate of change of the dielectric coefficient of the object to be processed by the detecting module to determine the thawing progress of the object to be processed.
  • the temperature of the object to be treated is already high (ie, the temperature of the object to be treated is greater than or equal to -7 ° C)
  • the thermal effect is significantly attenuated, so that the object to be treated is not decomposed. .
  • the RF thawing power is large, for example, greater than 100 W.
  • the inventors of the present application have creatively recognized that when the temperature of the object to be treated is already high, the operating power of the radio frequency generating module is reduced by 30 to 40%, which can effectively prevent the object to be treated from being decomposed. Further, the present invention determines whether the defrosting is completed by the rate of change of the dielectric coefficient of the object to be treated. Compared with the prior art, by sensing the temperature of the object to be processed, it is judged whether the thawing is completed, and the judgment is more accurate, and the refusal can be further prevented.
  • the treated material is decomposed, and the test indicates that the temperature of the object to be treated which is thawed by the thawing device of the present invention is generally -4 to -2 ° C when the thawing is completed, and it is possible to prevent the blood from being thawed when the object to be treated is meat.
  • FIG. 1 is a schematic structural view of a defrosting apparatus according to an embodiment of the present invention.
  • Figure 2 is a schematic cross-sectional view taken along line A-A of Figure 1;
  • Figure 3 is a schematic structural view of the thawing apparatus of Figure 1, wherein the apparatus door of the defrosting apparatus is removed to show the internal structure of the cylinder;
  • FIG. 4 is a graph showing a rate of change of a dielectric coefficient of an object to be processed according to an embodiment of the present invention
  • Figure 5 is a flow chart of a defrosting method for a defrosting device in accordance with one embodiment of the present invention
  • FIG. 6 is a schematic structural view of a refrigerator in which all outer door bodies of the refrigerator are removed to show a compartment structure in a cabinet of the refrigerator according to an embodiment of the present invention
  • Figure 7 is a schematic cross-sectional view of the refrigerator shown in Figure 6;
  • Figure 8 is a schematic structural view of the compressor chamber of Figure 7;
  • FIG. 9 is a detailed flow chart of a defrosting method for a refrigerator in accordance with one embodiment of the present invention.
  • the thawing apparatus 100 may include a barrel 110, a device door 120, a radio frequency generating module 130, and an upper electrode plate 140a and a lower electrode plate 140b.
  • the barrel 110 can include a top plate, a bottom plate, a back plate, and two opposing lateral side plates, which can define a defrosting chamber 114 having a forward opening for placing the object to be treated.
  • the device door 120 may be disposed at a forward opening of the defrosting chamber 114 for opening or closing the defrosting chamber 114.
  • the device door 120 can be mounted to the barrel 110 by a suitable method, such as a left open door, a right open door, or an upper open door.
  • the RF generation module 130 can be configured to generate a radio frequency signal (generally referred to as a radio frequency signal having a frequency between 300 KHz and 300 GHz).
  • the upper electrode plate 140a and the lower electrode plate 140b are respectively horizontally disposed at the top wall and the bottom wall of the defrosting chamber 114, and are respectively electrically connected to the radio frequency generating module 130 to be in the defrosting cavity according to the radio frequency signal generated by the radio frequency generating module 130.
  • a radio frequency wave of a corresponding parameter is generated in the chamber 114, and the object to be treated placed in the defrosting chamber 114 is thawed.
  • the upper electrode plate 140a is a transmitting antenna; the lower electrode plate 140b is a receiving antenna.
  • the upper electrode plate 140a and the lower electrode plate 140b may be electrically connected to the radio frequency generating module 130, respectively, using a 50 ohm electrical connection.
  • a tray 170 may also be disposed in the thawing chamber 114 for carrying the object to be treated.
  • the tray 170 may be provided with at least one load cell 171 configured to sense the weight of the object to be processed and confirm the operating power of the radio frequency generating module 130 according to the weight of the object to be processed.
  • the present invention determines the working power of the radio frequency generating module 130 by the weight of the object to be treated, has a better thawing effect, and avoids unnecessary energy waste.
  • the number of the load cells 171 may be one, two or two or the like.
  • the number of load cells 171 is one, and one load cell 171 is disposed at the center of the tray 170. In other embodiments, the number of load cells 171 is plural (two, three or more, etc.), and a plurality of load cells 171 are evenly distributed on the tray 170 so that the tray 170 can be divided into A plurality of areas of equal area, and each area is provided with a load cell 171. In this embodiment, the weight of the object to be treated is an average of the weights sensed in the plurality of load cells 171.
  • the radio frequency generating module 130 may be configured to start working when the weight of the object to be processed is within a preset range; when the weight of the object to be processed is not within the preset range, the work does not start.
  • the radio frequency generating module 130 can be further configured to be greater than or equal to a first weight threshold and less than a second weight threshold, and its operating power is 75-95% of its rated power, for example, 75%, 80. %, 90% or 95%; when the weight of the object to be treated is greater than or equal to the second weight threshold and less than or equal to a third weight threshold, the operating power is its rated power.
  • the first weight threshold is greater than zero, the first weight threshold is less than the second weight threshold, the second weight threshold is less than the third weight threshold, and the preset range is greater than or equal to the first weight threshold being less than or equal to the third weight threshold.
  • the first weight threshold may be 0.4 to 0.6 kg, such as 0.4 kg, 0.5 kg or 0.6 kg; the second weight threshold may be 0.9 to 1.1 kg, such as 0.9 kg, 1.0 kg or 1.1 kg;
  • the threshold may be 1.4 to 1.6 kg, such as 1.4 kg, 1.5 kg or 1.6 kg;
  • the radio frequency generating module 130 may have a rated power of 100 to 150 W, such as 100 W, 120 W, 130 W or 150 W.
  • the defrosting device 100 can be configured to issue a visual and/or audible signal to alert the user to no load when the weight of the object to be treated is less than the first weight threshold; when the weight of the object to be treated is greater than the third weight threshold , emitting visual and / or audible signals to alert the user to overload.
  • An indicator light and/or an alarm may be disposed on the device door 120 to issue a visual and/or audible signal to alert the user when the object to be treated is too small (less than the first weight threshold) or too large (greater than the third weight threshold) .
  • the present invention prevents the user from being idling when the weight of the object to be treated is too small, thereby avoiding the occurrence of the phenomenon of "empty burning", that is, avoiding the work of the radio frequency generating module 130 when it is idling, and reducing the freezing device 100. Failure rate and avoiding undesired energy consumption.
  • the weight of the object to be treated is too large, the user is reminded of the overload, and the phenomenon that the temperature difference is excessively reduced (greater than 3 ° C) due to excessive temperature difference between the inside and the outside of the object to be treated is avoided.
  • the defrosting device 100 can also include a detection module 150.
  • the detecting module 150 can be configured to detect an incident wave signal and a reflected wave signal connecting the electrical connection between the RF generating module 130 and the upper plate, and calculate the RF according to the voltage and current of the incident wave signal and the voltage and current of the reflected wave signal.
  • the load impedance of module 130 occurs. The load impedance is calculated as follows:
  • SWR is the standing wave ratio
  • Z 1 is the output impedance
  • Z 2 is the load impedance
  • U 1 is the incident wave voltage
  • I 1 is the incident wave current
  • R 1 is Output resistance
  • X 1 is the output impedance
  • U 2 is the reflected wave voltage
  • I 2 is the reflected wave current
  • R 2 is the output resistance
  • X 2 is the load impedance (as understood by those skilled in the art, the output impedance is connected to the radio frequency
  • the impedance of the electrical connection between the module 130 and the upper electrode plate 140a, the load impedance is the impedance of the object to be processed).
  • the thawing device 100 can also include a load compensation module 160.
  • the load compensation module 160 can include a compensation unit and a motor for adjusting the load of the compensation unit.
  • the compensation unit may be arranged in series with the object to be processed, that is, the load impedance of the RF generating module 130 is the sum of the impedance of the object to be processed and the impedance of the compensation unit.
  • Controlled motors may be configured to increase or decrease the load compensation unit, thereby increasing or decreasing the occurrence of radio frequency load impedance Z 2 of the module 130, and a radio frequency of occurrence of load impedance Z 2 module 130 and the output impedance Z 1 of
  • the difference ie, the value obtained by subtracting the output impedance Z 1 from the load impedance Z 2
  • the first impedance threshold is less than the second impedance threshold to improve the object to be processed. Thawing efficiency.
  • the load compensation module can be configured such that the absolute value of the difference between the load impedance Z 2 of the RF generation module 130 and the output impedance Z 1 is less than 5% of the output impedance Z 1 throughout the thawing process, for example, can be an output 1%, 3% or 5% of the impedance Z 1 .
  • the detecting module 150 can be configured to further calculate a dielectric constant of the object to be processed and a rate of change of the dielectric coefficient according to the load impedance Z 2 of the radio frequency generating module 130.
  • the formula for calculating the dielectric constant of the object to be treated is as follows:
  • f is the frequency of the radio frequency wave
  • C is the capacitance of the capacitor formed by the upper electrode plate 140a and the lower electrode plate 140b
  • ⁇ is the dielectric constant of the object to be processed
  • K is an electrostatic constant
  • d is the thickness of the upper plate
  • S is the area of the upper plate.
  • the rate of change of the dielectric coefficient of the object to be treated can be obtained by calculating the change value ⁇ of the dielectric coefficient ⁇ per unit time ⁇ t, wherein the unit time ⁇ t can be 0.1 second to 1 second, for example, 0.1 second, 0.5 second or 1 second.
  • 4 is a graph showing a rate of change of a dielectric constant of an object to be processed according to an embodiment of the present invention (the ordinate is a rate of change of the dielectric coefficient of the object to be processed ⁇ / ⁇ t; and the abscissa is a thawing time of the object to be processed t , the unit is min). Referring to FIG.
  • the radio frequency generating module 130 can be configured to reduce the operating power by 30% to 40% when the rate of change ⁇ / ⁇ t of the dielectric coefficient of the object to be processed is greater than or equal to the first rate threshold. For example, 30%, 35% or 40% to prevent the object to be treated from being excessively thawed (as understood by those skilled in the art, the temperature of excessively thawed to be treated is greater than 0 °C).
  • the first predetermined threshold may be 15-20, such as 15, 17, 18 or 20.
  • the radio frequency generation module 130 may be further configured to stop the operation when the rate of change ⁇ / ⁇ t of the dielectric coefficient of the object to be processed falls below a second rate threshold.
  • the second preset threshold may be 1 to 2, such as 1, 1.5 or 2.
  • the dielectric constant of the object to be treated also changes, which is well known to those skilled in the art, but the dielectric constant is usually measured by a dedicated instrument (for example, a dielectric coefficient tester).
  • the special instrument takes up a lot of space and costs, and is not suitable for a small-sized thawing device.
  • the invention detects the incident wave signal and the reflected wave signal of the electrical connection connecting the radio frequency generating module 130 and the upper plate, and calculates the dielectric coefficient of the object to be processed, which has small occupied space and low cost, and is particularly suitable for the thawing device. .
  • the present invention determines the rate of change of the dielectric coefficient of the object to be processed by the detecting module 150 to determine the thawing progress of the object to be processed.
  • the thermal effect is significantly attenuated, so that the object to be treated is not decomposed. .
  • the RF thawing power is large, for example, greater than 100 W.
  • the temperature of the object to be treated itself is already high, the object to be treated is easily over-thawing.
  • the inventors of the present application have creatively recognized that when the temperature of the object to be treated is already high, the operating power of the radio frequency generating module 130 is reduced by 30 to 40%, which can effectively prevent the object to be treated from being decomposed.
  • the present invention determines whether the defrosting is completed by the rate of change of the dielectric coefficient of the object to be treated. Compared with the prior art, by sensing the temperature of the object to be processed, it is judged whether the thawing is completed, and the judgment is more accurate, and the refusal can be further prevented.
  • the treated material is decomposed, and the test indicates that the temperature of the object to be treated which is thawed by the thawing device of the present invention is generally -4 to -2 ° C when the thawing is completed, and it is possible to prevent the blood from being thawed when the object to be treated is meat.
  • Fig. 2 is a schematic cross-sectional view taken along line A-A of Fig. 1.
  • the cylinder 110 may further include a vertical partition 111 and a horizontal partition 112 for defining an inner space of the cylinder 110.
  • the vertical partition 111 may be disposed to extend from the top plate of the cylinder 110 in the vertical direction to the bottom plate of the cylinder 110.
  • the radio frequency generating module 130 may be disposed between the vertical partition 111 and the rear plate of the cylinder 110.
  • the horizontal partition 112 may be disposed to extend forward from the vertical partition 111 in the horizontal direction.
  • the detection module 150 and the load compensation module 160 may be disposed between the horizontal partition 112 and the top plate of the cylinder 110.
  • the thawing chamber 114 may be enclosed by a vertical partition 111, a horizontal partition 112, and a bottom plate of the cylinder 110 and two lateral side panels.
  • the upper electrode plate 140a may be disposed on a lower surface of the horizontal partition plate 112, and the lower electrode plate 140b may be disposed on an upper surface of the bottom plate of the cylindrical body 110.
  • the vertical partition 111 may be provided with a first through port 1112 to electrically connect the radio frequency generating module 130 to the upper electrode plate 140a via the first through port 1112.
  • the barrel 110 may further include a baffle 113 extending upward from the front side end of the horizontal partition 112 in the vertical direction to the top plate of the cylinder 110 to prevent the detection module 150 and the load compensation module 160 from being exposed, reducing the defrosting device 100. Aesthetics.
  • the rear plate of the cylinder 110 may be provided with a device air inlet 115
  • the vertical partition 111 of the rear side of the defrosting chamber 114 may be provided with a thawing air inlet 1111 to allow air outside the defrosting device 100 to pass through
  • the device air inlet 115 and the defrosting air inlet 1111 enter the defrosting chamber 114 of the defrosting device 100.
  • the side plates on the lateral sides of the thawing chamber 114 may be provided with a device air outlet 118 to allow the gas in the defrosting chamber 114 to be discharged to the outside of the defrosting device 100 via the device air outlet 118.
  • the device air inlet 115 and the defrosting air inlet 1111 of the defrosting device 100 are respectively disposed on lateral sides of the radio frequency generating module 130 to facilitate heat dissipation of the radio frequency generating module 130. In some alternative embodiments, the device air inlet 115 and the defrosting air inlet 1111 of the defrosting device 100 may be disposed on the same side of the radio frequency generating module 130.
  • the present invention provides a device air inlet 115 and a device air outlet 118 on the defrosting device 100.
  • the defrosting chamber 114 can be used to place the food material, so that the storage space in the defrosting device 100 can be fully utilized. .
  • the tray 170 can be configured to be controllably moved in the depth direction of the defrosting chamber 114 to facilitate placement and removal of the object to be treated.
  • the lower surface of the tray 170 may be spaced from the lower electrode plate 140b by a distance of 8 to 12 mm, such as 8 mm, 10 mm, 12 mm, to prevent friction with the lower electrode plate 140b during the pulling of the tray 170. .
  • Fig. 3 is a schematic structural view of the thawing apparatus of Fig. 1 in which the apparatus door of the defrosting apparatus is removed to show the internal structure of the cylinder.
  • the barrel 110 and the device door 120 can be provided with electromagnetic shielding features 117, respectively.
  • the electromagnetic shielding feature 117 disposed on the barrel 110 and the electromagnetic shielding feature 117 disposed on the device door 120 are electrically connected to reduce the amount of magnetic leakage outward of the defrosting device 100 when the device door 120 is closed.
  • the electromagnetic shielding feature 117 may be a conductive coating applied to the inner wall of the cylinder 110 and the inner surface of the device door 120 (facing the surface of the cylinder 110), abutting against the inner wall of the cylinder 110, and inside the device door 120.
  • the thawing device 100 can also include an elastic conductive loop 180.
  • the elastic conductive ring 180 can be disposed at the periphery of the forward opening of the defrosting chamber 114 to cause squeezing deformation when the device door 120 is closed, and closely fits the device door 120, that is, the elastic conductive ring 180 A seal is formed with the device door 120.
  • the electromagnetic shielding feature 117 disposed on the barrel 110 and the electromagnetic shielding feature 117 disposed on the device door 120 may be respectively disposed in conductive contact with the elastic conductive ring 180 to reduce the defrosting device 100 outward when the device door 120 is closed. The amount of magnetic leakage.
  • the elastomeric conductive collar 180 can be made of silicone, silicone fluoride, EPDM, fluorocarbon-silicone, and silver plated aluminum.
  • the resilient conductive ring 180 can be a hollow annular structure to closely conform to the device door 120 when the device door 120 is closed.
  • the flexible conductive ring 180 may have a width of 20 to 30 mm, such as 20 mm, 25 mm or 30 mm, to improve the sealing of the defrosting device 100.
  • the device air inlet 115, the defrosting air inlet 1111, and the device air outlet 118 of the defrosting device 100 may each be provided with a conductive metal mesh 190, which may be disposed to be electromagnetically shielded from the cylindrical body 110.
  • the feature 117 is electrically connected to reduce the amount of magnetic leakage of the defrosting device 100.
  • the frequency of the radio frequency signal generated by the radio frequency generating module 130 may be 40 to 42 MHz, for example, 40 MHz, 40.48 MHz, 40.68 MHz, 41 MHz, or 42 MHz, to reduce The thawing time of the material to be treated increases the temperature uniformity of the object to be treated and reduces the rate of juice loss.
  • the frequency of the radio frequency wave may be a predetermined fixed frequency in the range of 40.48-40.68 MHz to further reduce the thawing time of the object to be treated, improve the temperature uniformity of the object to be treated, and reduce the juice loss rate. .
  • the frequency of the radio frequency wave is 40.68MHz, the thawing effect is the best.
  • the power of the RF wave is 100 W, and the structure and the working flow of the thawing device 100 are the same.
  • the thawing effect test was performed on the defrosting apparatus 100 provided with the frequencies of the respective examples and the respective comparative examples.
  • the thawing time is from the beginning of the thawing, and the thawing device 100 determines the time when the thawing is completed (that is, the RF generating module stops working); the temperature uniformity: after the thawing is completed, the temperature of the four corners and the center point of the beef are respectively measured, and the calculation is performed.
  • the difference between the average value of the corners and the temperature of the center point, the temperature uniformity is the ratio of the difference to the average value; the rate of juice loss: the weight before the thawing of the beef and the weight after thawing, and the difference between the two is calculated. Value, juice loss rate is the ratio of this difference to the weight of the beef before thawing.
  • Example 1 19 0.4 0.35
  • Example 2 18 0.4 0.32
  • Example 3 18 0.3 0.29
  • Example 4 19 0.5 0.35
  • Example 5 20 0.5 0.40 Comparative example 1 25 0.6 0.35 Comparative example 2 twenty three 0.6 0.40
  • Example 5 According to the test results of Example 5 and Comparative Example 1 in Table 2, it can be seen that under the same test conditions, the present invention is applied under the same test conditions, in the case where the power of the radio frequency wave is the same, and the structure and the working flow of the thawing device 100 are the same.
  • the thawing device 100 of the RF frequency within the scope of the embodiment has a better thawing effect than the defrosting device 100 using the RF frequency of the prior art, the former having a 20% reduction in thawing time and a 17% increase in temperature uniformity.
  • the thawing time of the thawing apparatus 100 of each embodiment of the present invention is less than 20 minutes, the temperature uniformity is below 0.5, and the juice loss rate is below 0.40%.
  • the frequency of the radio frequency wave for example, the radio frequency is 40.48 to 40.68 MHz
  • the thawing time of the thawing device 100 can be reduced to 18 minutes or less, the temperature uniformity is increased to 0.4 or less, and the juice loss rate is reduced to 0.32% or less.
  • FIG. 5 is a flow chart of a thawing method for the defrosting apparatus 100, in accordance with one embodiment of the present invention.
  • the defrosting method of the thawing apparatus 100 of the present invention may include the following steps:
  • the load cell 171 senses the weight of the object to be processed
  • S506 Determine the working power of the radio frequency generating module 130.
  • the present invention may also provide a refrigerator 10 based on the defrosting apparatus 100 of any of the foregoing embodiments.
  • 6 is a schematic structural view of a refrigerator 10 according to an embodiment of the present invention, in which all outer door bodies of the refrigerator 10 are removed to show a compartment structure in the cabinet 200 of the refrigerator 10;
  • FIG. A schematic cross-sectional view of the refrigerator 10 shown in FIG. Referring to Figures 1, 6 and 7, the refrigerator 10 may generally include a cabinet 200 defining at least one receiving space, a compartment door for respectively opening and closing the access opening of each of the receiving spaces, and being disposed in a receiving space. Thawing device 100.
  • the number of the accommodation spaces of the refrigerator 10 may be three, which are the refrigerating compartment 210, the variable temperature compartment 220, and the freezing compartment 230, respectively, and are used for opening and closing the refrigerating compartment 210 and the temperature changing compartment, respectively.
  • the refrigerating door body 211 of the freezing compartment 230, the temperature changing door body 221, and the freezing door body 231 are provided in the temperature changing compartment 220.
  • the refrigerating compartment 210 refers to a storage compartment having a storage temperature of 0 to +8 ° C
  • the freezing compartment 230 refers to a storage temperature of the foodstuff.
  • the variable temperature compartment 220 means that the storage temperature can be changed over a wide range (for example, the adjustment range can be above 4 ° C, and can be adjusted to above 0 ° C or below 0 ° C)
  • the storage compartment generally has a storage temperature that spans refrigeration, soft freezing (typically -4 to 0 °C) and freezing temperature, preferably -16 to +4 °C.
  • the refrigerator 10 may be an air-cooled refrigerator, and the temperature change compartment 220 may include a duct cover.
  • the air duct cover and the rear inner wall of the temperature change compartment 220 are formed to form a variable temperature air duct, and the air duct cover is provided with a temperature change air inlet for providing cooling capacity to the temperature change compartment 220.
  • the device air inlet 215 and the variable temperature air inlet of the thawing device 200 can be connected by a connecting tube to facilitate cooling of the defrosting chamber 114 of the defrosting device 100.
  • the projection of the device air inlet 115 of the defrosting device 100 in the thickness direction of the rear plate of the barrel 110 may be within the variable temperature air inlet to facilitate cooling of the defrosting chamber 114 of the defrosting device 100.
  • any one of the compartment door bodies may be provided with a defrosting switch 224 for controlling the start or stop of the defrosting procedure.
  • the load cell 171 can be configured to begin operation when the defrosting switch 224 is open and the device door 120 is closed; when the RF generating module 130 begins to operate, the operation is stopped.
  • the user can terminate the defrosting procedure by turning off the defrosting switch 224.
  • a buzzer (not shown) may be disposed on any of the compartment door bodies to prompt the user that the object to be treated has been thawed.
  • the buzzer may be configured to start working when the detecting module 150 determines that the thawing of the object to be processed is completed (the rate of change of the dielectric coefficient of the object to be treated drops to less than or equal to a second predetermined threshold); when the object to be processed is from the thawing chamber When the chamber 114 is taken out, the operation is stopped.
  • An infrared sensor may be disposed on the inner wall of the defrosting chamber 114 to sense whether or not the object to be treated is placed in the defrosting chamber 114.
  • the distance between the thawing device 100 and the inner walls on the lateral sides of the accommodating space in which it is disposed may be 2 to 3 mm, for example, 2 mm, 2.5 mm, or 3 mm, so that the gas in the thawing compartment is discharged into the accommodating space.
  • the thawing device 100 can be fixed in the accommodating space by an interference fit or a snap fit with the inner wall on the vertical sides of the accommodating space.
  • the refrigerator 10 may be an air-cooled refrigerator, and the temperature change compartment 220 may include a duct cover 222.
  • the air duct cover 222 and the rear inner wall of the temperature change compartment 220 form a temperature change air passage, and the air duct cover 222 is provided with a temperature change air inlet 2221 for providing a cooling capacity to the temperature change compartment 220.
  • the device air inlet 115 and the variable temperature air inlet 2221 of the defrosting device 100 may be coupled through a connecting tube 223 to facilitate cooling of the defrosting chamber 114 of the defrosting device 100.
  • the projection of the device air inlet 115 of the defrosting device 100 in the thickness direction of the rear plate of the cylinder 110 may be within the variable temperature air inlet 2221 to facilitate cooling of the thawing chamber 114 of the defrosting device 100.
  • a temperature-changing air inlet damper may be disposed at the temperature-changing air inlet 2221 to turn on or block the temperature-changing air duct.
  • the variable temperature inlet damper can be configured to: when the radio frequency generating module 130 is in the working state, the variable temperature inlet damper is closed, that is, the variable temperature air duct stops providing cooling capacity to the temperature changing compartment 220 to avoid affecting the thawing device 100 to thaw the object to be treated.
  • the variable temperature inlet damper is opened, that is, the variable temperature air duct can provide cooling capacity to the variable temperature compartment 220 according to the original refrigeration control program of the refrigerator 10, and the defrosting chamber 114 is used for placing the foodstuff.
  • Fig. 8 is a schematic structural view of the compressor chamber 241 of Fig. 7.
  • the cabinet 200 of the refrigerator 10 further defines a compressor chamber 240.
  • the compressor chamber 240 may include a main control board 243, a compressor 241, a condensate collecting structure 244, and an external power supply line (not shown) for controlling the operation of the refrigerator 10, which are sequentially disposed.
  • the refrigerator 10 may further include a power supply module 242 for powering the radio frequency generating module 130.
  • the power supply module 242 can be disposed in the compressor room 240 of the refrigerator 10 to facilitate heat dissipation and maintenance of the power supply module 242.
  • the rear plate of the cylinder 110 may be provided with a second wire opening 116 for electrically connecting from the power supply module 242 to the radio frequency generating module 130 via the second wire opening 116.
  • the power supply module 242 can be fixed to the upper wall of the compressor room 240 to facilitate electrical connection between the RF generating module 130 and the power supply module 242.
  • the power supply module 242 can be an ACDC converter.
  • the ACDC converter can be configured to be electrically coupled to the main control board 243 to power the RF generation module 130.
  • the ACDC converter can be disposed between the main control board 243 and the compressor 241 to make the electrical connection of the power supply module 242 and the main control board 243 more convenient. It will be understood by those skilled in the art that it is easy to connect the various components of the defrosting device 100 to the control circuitry of the refrigerator 10.
  • the defrosting method of the refrigerator 10 of the present invention may include the following steps:
  • Step S902 It is determined whether the defrosting switch 224 is turned on, and if so, step S904 is performed; if not, step S902 is performed.
  • Step S904 The power supply module 242 starts to work.
  • Step S906 determining whether the device door 120 is closed, and if so, executing step S908; if not, executing step S906.
  • Step S908 The load cell 171 senses the weight of the object to be processed.
  • Step S910 Obtain the weight of the object to be processed.
  • Step S912 determining whether the weight of the object to be processed is greater than or equal to the first weight threshold, and if yes, executing step S916; if not, executing step S914.
  • Step S914 A visual and/or audible signal is issued to alert the user to no load.
  • Step S916 determining whether the weight of the object to be processed is greater than or equal to the second weight threshold, and if yes, executing step S918; if not, executing step S922.
  • Step S918 determining whether the weight of the object to be processed is greater than the third weight threshold, and if yes, executing step S920; if not, executing step S924.
  • Step S922 The radio frequency generating module 130 operates at a rated power of 80%. Step S126 is performed.
  • Step S924 The radio frequency generating module 130 operates at a rated power. Step S926 is performed.
  • Step S926 The temperature-increasing intake damper is closed, the radio frequency generating module 130 generates a radio frequency signal of 40 to 42 MHz, and the detecting module 150 detects an incident wave signal and a reflected wave signal connecting the electrical connection between the radio frequency generating module 130 and the upper electrode plate 140a.
  • the frequency of the radio frequency signal generated by the radio frequency generating module 130 is 40.68 MHz.
  • Step S928 Acquire voltage and current of the incident wave signal and voltage and current of the reflected wave signal, and calculate a rate of change ⁇ / ⁇ t of the dielectric coefficient of the object to be processed.
  • Step S930 determining whether the rate of change ⁇ / ⁇ t of the dielectric coefficient of the object to be processed is greater than or equal to the first rate threshold, and if yes, executing step S932; if not, executing step S928.
  • Step S932 The current working power of the radio frequency generating module 130 is reduced by 30-40%. In this step, the current operating power of the radio frequency generating module 130 is reduced by 35%.
  • Step S934 Acquire voltage and current of the incident wave signal and voltage and current of the reflected wave signal, and calculate a rate of change ⁇ / ⁇ t of the dielectric coefficient of the object to be processed.
  • Step S936 determining whether the rate of change ⁇ / ⁇ t of the dielectric coefficient of the object to be processed is less than or equal to the second rate threshold, and if so, executing step S938; if not, executing step S934.
  • Step S938 The power supply module 242 stops working, the defrosting switch 224 is reset (ie, turned off), the temperature-increasing air inlet damper is opened, and the buzzer starts to work.
  • Step S940 determining whether the object to be processed is taken out from the defrosting chamber, and if so, executing step S942; if not; executing step S938.
  • Step S942 The buzzer stops working.
  • Step S929 Acquire the voltage and current of the incident wave signal and the voltage and current of the reflected wave signal, and calculate the load impedance Z2 of the RF generating module 130.
  • Step S931 It is determined whether the difference between the load impedance Z2 of the radio frequency generating module 130 and the output impedance Z1 is greater than the first impedance threshold. If yes, step S933 is performed; if not, step S935 is performed.
  • Step S933 The motor of the load compensation module 160 operates to reduce the impedance of the compensation unit. Go back to step S929.
  • Step S935 It is determined whether the difference between the load impedance Z2 of the radio frequency generating module 130 and the output impedance Z1 is less than the second impedance threshold. If yes, step S937 is performed; if not, step S929 is performed.
  • Step S937 The motor of the load compensation module 160 operates to increase the impedance of the compensation unit. Go back to step S929.
  • the power supply module 242 stops working, that is, the power supply is stopped, and the radio frequency generating module 130, the detecting module 150, and the load compensation module 160 stop working, that is, when the object to be processed is
  • the detecting module 150 stops detecting the incident wave signal and the reflected wave signal connecting the electrical connection between the radio frequency generating module 130 and the upper plate 140 a, and the load compensation module 160 stopped working.
  • a thawing workflow of the refrigerator 10 may include: when the user opens the defrosting switch 224, the power supply module 242 starts to supply power, and when the device door 120 is closed, the weighing sensor senses the weight of the object to be processed, according to The weight of the object to be processed determines whether the radio frequency generating module 130 operates and determines the operating power at the time of its operation.
  • the RF generating module 130 generates a 40.68 MHz RF signal, the variable temperature inlet damper is closed, the cooling is stopped for the variable temperature compartment, and the detection module 150 and the load compensation module 160 start to work.
  • the detecting module 150 detects the incident wave signal and the reflected wave signal connecting the electrical connection between the RF generating module 130 and the upper plate, and calculates the load impedance Z 2 of the RF transmitting device 130 and the rate of change ⁇ / ⁇ t of the dielectric coefficient.
  • the rate of change ⁇ / ⁇ t of the dielectric coefficient of the object to be processed is greater than or equal to the first rate threshold, the operating power of the RF generating module 130 is reduced by 35%, and at the same time, the load impedance of the RF generating module 130 is used throughout the thawing workflow.
  • the load compensation module 160 adjusts the impedance of the compensation unit by the motor, thereby adjusting the load impedance Z 2 of the RF generating module 130 to generate the RF.
  • the difference between the load impedance Z 2 of the module 130 and the output impedance Z 1 is always greater than or equal to the first impedance threshold and less than or equal to the second impedance threshold.
  • the power supply module 242 stops supplying power, the defrosting switch 224 is turned off, the variable temperature inlet damper is opened, the radio frequency generating module 130, the detecting module 150 and the load compensation Module 160 stops working and the buzzer starts working.
  • the buzzer stops working.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Food Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Nutrition Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Freezing, Cooling And Drying Of Foods (AREA)
  • Electric Ovens (AREA)

Abstract

L'invention concerne un procédé de décongélation pour un appareil de décongélation. L'appareil de décongélation (100) comprend un cylindre (110) ayant une chambre de décongélation (114), un corps de porte d'appareil (120) pour ouvrir et fermer la chambre de décongélation (114), un module de génération de radiofréquence (130), une plaque d'électrode supérieure (140a) et une plaque d'électrode inférieure (140b) respectivement reliées électriquement au module de génération de radiofréquence (130), un plateau (170) disposé dans la chambre de décongélation (114) et un capteur de pesage (171) disposé sur le plateau (170). Le procédé de décongélation comprend les étapes suivantes : détection du poids des aliments à traiter (S502) par le capteur de pesage (171) ; acquisition du poids des aliments à traiter (S504) ; et détermination de la puissance de fonctionnement du module de génération de radiofréquences (130) (S506). La puissance de fonctionnement du module de génération de radiofréquences (130) est déterminée au moyen du poids des aliments à traiter, de sorte que le procédé de décongélation présente de meilleurs effets de décongélation et empêche un inutile gaspillage d'énergie.
PCT/CN2018/089912 2017-06-06 2018-06-05 Procédé de décongélation pour appareil de décongélation WO2018223948A1 (fr)

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