CN108991339B - Thawing method for thawing device - Google Patents
Thawing method for thawing device Download PDFInfo
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- CN108991339B CN108991339B CN201710418998.0A CN201710418998A CN108991339B CN 108991339 B CN108991339 B CN 108991339B CN 201710418998 A CN201710418998 A CN 201710418998A CN 108991339 B CN108991339 B CN 108991339B
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- thawing
- generation module
- radio frequency
- impedance
- frequency generation
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- 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
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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
Abstract
The invention provides a thawing method for a thawing device. The unfreezing device comprises a barrel body, a device door body, a radio frequency generation module, an upper electrode plate and a lower electrode plate, and a locking device, wherein the barrel body is limited with a unfreezing chamber which is used for placing an object to be processed and is provided with a forward opening; the unfreezing method comprises the following steps: judging whether the radio frequency generation module is in a working state; if the radio frequency generation module is in a working state, the locking device works; if the radio frequency generation module is not in the working state, the locking device does not work. When the radio frequency generation module is in a working state, the cylinder body and the device door body are locked, so that the situation that a user opens the device door body in the unfreezing process and radio frequency waves in the unfreezing device leak outwards can be prevented, and the safety of the unfreezing device is improved.
Description
Technical Field
The invention relates to the field of unfreezing, in particular to a unfreezing method for a unfreezing device.
Background
During the freezing process, the quality of the food is maintained, however, the frozen food needs to be thawed before processing or consumption. In order to facilitate a user to freeze and thaw food, the related art generally defrosts the food by providing a heating device or a microwave device in a refrigerator.
However, the heating device generally needs a long thawing time to thaw food, and the thawing time and temperature are not easy to be controlled, so that water evaporation and juice loss of the food are easily caused, and the quality of the food is lost; the microwave device is used for unfreezing food, the speed is high, the efficiency is high, the loss of nutrient components of the food is low, but the penetration and the absorption of microwaves to water and ice are different, the distribution of internal substances of the food is not uniform, the energy absorbed by a melted area is large, and the problems of uneven unfreezing and local overheating are easily caused. In view of the above, there is a need for a thawing method for a thawing apparatus having high thawing efficiency, uniform thawing, and guaranteed food quality in design.
Disclosure of Invention
It is an object of the first aspect of the invention to provide a thawing method for a thawing apparatus with high safety.
It is a further object of the first aspect of the invention to improve the defrosting efficiency of the defrosting unit.
It is a further object of the first aspect of the invention to avoid excessive thawing of the substance to be treated.
It is an object of the second aspect of the present invention to provide a thawing method for a refrigerator.
In particular, according to a first aspect of the present invention, there is provided a thawing method for a thawing apparatus, the thawing apparatus including a barrel defining a thawing chamber for placing an object to be processed and having a forward opening, an apparatus door for opening and closing the thawing chamber provided at the forward opening of the thawing chamber, a radio frequency generation module, upper and lower electrode plates horizontally provided at top and bottom walls of the thawing chamber, respectively, and electrically connected to the radio frequency generation module, respectively, and a locking device for locking the barrel and the apparatus door; the thawing method comprises the following steps:
judging whether the radio frequency generation module is in a working state;
if the radio frequency generation module is in a working state, the locking device works;
and if the radio frequency generation module is not in the working state, the locking device does not work.
Optionally, the thawing apparatus further includes a detection module, and the detection module is configured to detect an incident wave signal and a reflected wave signal of an electrical connection line connecting the radio frequency generation module and the upper electrode plate; the thawing method comprises the following steps:
when the radio frequency generation module is in a working state, detecting an incident wave signal and a reflected wave signal of the electric connection line;
acquiring voltage and current of the incident wave signal and voltage and current of the reflected wave signal;
and calculating the load impedance of the radio frequency generation module.
Optionally, the thawing device further comprises a load compensation module, wherein the load compensation module comprises a compensation unit arranged in series with the object to be treated and a motor for increasing or decreasing the impedance of the compensation unit; the thawing method further comprises the following steps:
acquiring the load impedance of the radio frequency generation module;
judging whether the difference between the load impedance and the output impedance of the radio frequency generation module is greater than or equal to a first impedance threshold value and less than or equal to a second impedance threshold value; wherein the first impedance threshold is less than the second impedance threshold;
if the difference between the load impedance and the output impedance of the radio frequency generation module is smaller than the first impedance threshold value, increasing the impedance of the compensation unit;
if the difference between the load impedance and the output impedance of the radio frequency generation module is greater than the second impedance threshold, reducing the impedance of the compensation unit;
and if the difference between the load impedance and the output impedance of the radio frequency generation module is greater than or equal to the first impedance threshold and less than or equal to the second impedance threshold, the load compensation module does not work.
Optionally, the thawing method for the thawing apparatus further includes:
acquiring the load impedance of the radio frequency generation module;
calculating the change rate of the dielectric constant of the object to be processed;
and judging the thawing progress of the object to be treated.
Optionally, the step of judging the thawing progress of the object to be treated comprises:
obtaining the change rate of the dielectric constant of the object to be processed;
judging whether the change rate of the dielectric coefficient of the object to be processed is greater than or equal to a first rate threshold value or not;
if so, the working power of the radio frequency generation module is reduced by 30-40%.
Optionally, the step of judging the thawing progress of the object to be treated comprises:
obtaining the change rate of the dielectric constant of the object to be processed;
judging whether the change rate of the dielectric coefficient of the object to be processed is reduced to be less than or equal to a second rate threshold value or not;
if yes, the radio frequency generation module stops working.
Optionally, the thawing method for the thawing apparatus further includes:
if the change rate of the dielectric coefficient of the object to be processed is reduced to be less than or equal to a second rate threshold value, sending out a visual and/or auditory signal to remind a user;
the emission of the visual and/or acoustic signal is stopped if the object to be treated is removed in a controlled manner from the thawing chamber.
According to a second aspect of the present invention, there is provided a thawing method for a refrigerator including a case defining at least one accommodation space, compartment doors for opening and closing the accommodation spaces, respectively, and a thawing device provided in one of the accommodation spaces, the thawing method for a refrigerator including any one of the thawing methods for a thawing device described above.
Optionally, a thawing switch for controlling the start and stop of a thawing program is arranged on any one of the compartment door bodies; wherein the thawing method for the refrigerator comprises:
if the unfreezing switch is turned on, the radio frequency generation module starts to work;
and if the unfreezing switch is closed, the radio frequency generation module stops working.
Optionally, the defrosting method for the refrigerator further includes:
if the unfreezing switch is turned on, the refrigerator stops providing cold energy for the accommodating space provided with the unfreezing device;
and if the unfreezing switch is closed, the refrigerator runs the original refrigeration program.
According to the invention, when the radio frequency generation module is in a working state, the cylinder body and the device door body are locked, so that the situation that a user opens the device door body in the unfreezing process and radio frequency waves in the unfreezing device leak outwards to cause harm to a human body can be prevented, and the safety of the unfreezing device is improved.
Furthermore, the difference between the load impedance and the output impedance of the radio frequency generation module is within a preset range (greater than or equal to a first impedance threshold value and less than or equal to a second impedance threshold value) through the load compensation module, so that the thawing efficiency of the object to be treated is further improved.
Furthermore, the invention judges the thawing progress of the object to be treated by calculating the change rate of the dielectric coefficient of the object to be treated through the detection module. Prior to the present invention, it was generally believed by those skilled in the art that when the temperature of the treatment was high (i.e., the temperature of the treatment was-7℃. or higher), the thermal effects would be significantly attenuated and the treatment would not be excessively thawed. However, this is not the case, and the rf thawing power is usually large, for example, greater than 100W, and when the temperature of the object to be treated is already high, the object to be treated is easily over-thawed. The inventor of the application creatively realizes that when the temperature of the object to be treated is higher, the working power of the radio frequency generation module is reduced by 30-40%, and the object to be treated can be effectively prevented from being excessively thawed. Furthermore, the invention judges whether the unfreezing is finished or not according to the change rate of the dielectric coefficient of the object to be treated, compared with the prior art that whether the unfreezing is finished or not is judged by sensing the temperature of the object to be treated, the judgment is more accurate, the object to be treated can be further prevented from being excessively unfrozen, and tests show that the object to be treated unfrozen by the unfreezing device has the temperature of-4 to-2 ℃ generally when the unfreezing is finished, and the generation of blood water during unfreezing when the object to be treated is meat can be avoided.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic block diagram of a thawing apparatus according to one embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view taken along section line A-A in FIG. 1;
FIG. 3 is a schematic block diagram of the thawing apparatus of FIG. 1;
FIG. 4 is a schematic diagram of adjusting the load impedance of a radio frequency generation module according to one embodiment of the invention;
FIG. 5 is a graph of the rate of change of the dielectric constant of an object to be treated according to one embodiment of the present invention;
FIG. 6 is a flow diagram of a thawing method for a thawing apparatus according to one embodiment of the present invention;
fig. 7 is a schematic structural view of a refrigerator according to an embodiment of the present invention, in which all outer door bodies of the refrigerator are removed to show a compartment structure in a cabinet of the refrigerator;
FIG. 8 is a schematic cross-sectional view of the refrigerator shown in FIG. 7;
fig. 9 is a schematic structural view of the compressor chamber of fig. 8;
fig. 10 is a flowchart of a thawing method for a refrigerator according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic structural view of a thawing apparatus 100 according to an embodiment of the present invention. Referring to fig. 1, the thawing apparatus 100 may include a barrel 110, an apparatus door 120, a radio frequency generation module 130, and upper and lower electrode plates 140a and 140 b. The bowl 110 may include a top plate, a bottom plate, a rear plate, and two opposing lateral side plates, and may define a thawing chamber 114 therein having a forward opening, the thawing chamber 114 being used for placing an object to be treated. The door 120 may be disposed at a forward opening of the thawing chamber 114 for opening or closing the thawing chamber 114. The device door 120 may be installed with the cartridge 110 by an appropriate method, such as a left-handed door, a right-handed door, an up-handed door, or a pull-out door. The RF generation module 130 may be configured to generate RF signals (generally referred to as RF signals having a frequency of 300KHz to 300 GHz). The upper electrode plate 140a and the lower electrode plate 140b may be horizontally disposed at the top wall and the bottom wall of the thawing chamber 114, respectively, and are electrically connected to the rf generating module 130, respectively, so as to generate rf waves with corresponding parameters in the thawing chamber 114 according to the rf signals generated by the rf generating module 130, and to thaw the object to be processed placed in the thawing chamber 114. In the present invention, the upper electrode plate 140a is a transmitting antenna; the lower electrode plate 140b is a receiving antenna. In some embodiments, 50 ohm electrical connections may be used to electrically connect the upper electrode plate 140a and the lower electrode plate 140b, respectively, to the rf generation module 130.
Fig. 3 is a schematic configuration diagram of the thawing apparatus in fig. 1. Referring to fig. 3, in particular, the thawing apparatus 100 may further include a locking device for locking the cylinder 110 and the apparatus door 120. The locking means may include a first attraction portion 119 and a second attraction portion 121. The first suction portion 119 may be disposed at a periphery of the front opening of the thawing chamber 114, the second suction portion 121 may be disposed at a surface of the door body 120 facing the drum 110, and the second suction portion 121 may be disposed to contact the first suction portion 119 when the door body 120 is closed. The locking device may be configured to attract the second attraction part 121 by electrifying the first attraction part 119, and further lock the cylinder 110 and the device door 120. The locking device can be configured to work and lock the cylinder 110 and the device door 120 when the rf generation module 130 is in a working state; when the rf generating module 130 is in a non-operating state, it does not operate, and the door 120 can be controlled to open at this time.
According to the invention, when the radio frequency generation module is in a working state, the cylinder body and the device door body are locked, so that the situation that a user opens the device door body in the unfreezing process and radio frequency waves in the unfreezing device leak outwards to cause harm to a human body can be prevented, and the safety of the unfreezing device is improved.
In some embodiments, the thawing apparatus 100 may further comprise a detection module 150. The detection module 150 may be configured to detect an incident wave signal and a reflected wave signal of an electrical connection connecting the rf generation module 130 and the upper electrode plate, and calculate a load impedance of the rf generation module 130 based on a voltage and a current of the incident wave signal and a voltage and a current of the reflected wave signal. The calculation formula of the load impedance is as follows:
SWR＝Z2/Zl (1)
Zl＝Ul/lI＝RI+jXl (2)
Z2＝U2/l2＝R2+jX2 (3)
in equations (1), (2), (3): SWR is standing wave ratio; z1Is the output impedance; z2Is the load impedance; u shape1Is the incident wave voltage; i is1Is incident wave current; r1Is an output resistor; x1Is an output reactance; u shape2Is the reflected wave voltage; i is2Is a reflected wave current; r2Is a load resistor; x2Is a load reactance (as will be understood by those skilled in the art, the output impedance is the impedance of the electrical connection connecting the rf generating module 130 and the upper electrode plate 140a, and the load impedance is the impedance of the object to be processed).
Fig. 4 is a schematic diagram of adjusting the load impedance of the rf generation module 130 according to one embodiment of the invention. Referring to fig. 4, the thawing apparatus 100 may further include a load compensation module 160. The load compensation module 160 may include a compensation unit 161 and a motor 162 for adjusting an impedance of the compensation unit 161. The compensation unit 161 may be disposed in series with the object to be processed, i.e., when the load impedance of the rf generation module 130 is the sum of the impedance of the object to be processed and the impedance of the compensation unit 161. The motor 162 may be configured to controllably increase or decrease the impedance of the compensation unit 161, and thus the load impedance Z of the rf generation module 1302And makes the load impedance Z of the RF generation module 1302And an output impedance Z1Difference (i.e. load impedance Z)2Subtracting the output impedance Z1The obtained value) is more than or equal to a first impedance threshold value and less than or equal to a second impedance threshold value, and the first impedance threshold value is less than the second impedance threshold value, so as to improve the thawing efficiency of the object to be treated. In some preferred embodiments, the first impedance threshold is the output impedance Z1Is-6 to-4%, and the second impedance threshold is the output impedance Z14-6% of the total. Further preferably, the first impedance threshold is the output impedance Z1Of the second impedance threshold is the output impedance Z15% of the total. In other words, the load compensation module may be configured to cause the load impedance Z of the RF generation module 130 to be2And an output impedance Z1The absolute value of the difference is always smaller than the output impedance Z in the whole thawing process15% of (e) may be, for example, the output impedance Z11%, 3% or 5%.
The detection module 150 may be configured to further determine the load impedance Z of the RF generation module 1302And calculating the dielectric coefficient of the object to be treated and the change rate of the dielectric coefficient so as to judge the thawing progress of the object to be treated. The dielectric coefficient of the object to be processed is calculated by the following formula:
X2＝1/2πfC (4)
ε＝4πKdC/S (5)
in equations (4), (5): 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 140 b; epsilon is the dielectric coefficient of the object to be treated; k is an electrostatic constant; d is the thickness of the upper electrode plate; and S is the area of the upper electrode plate.
The rate of change of the permittivity of the object to be treated can be obtained by calculating the value of change Δ ∈ of the permittivity within a unit time Δ t, which may be 0.1 second to 1 second, for example, 0.1 second, 0.5 second, or 1 second. FIG. 5 is a graph showing a rate of change of permittivity of an object to be treated according to an embodiment of the present invention (ordinate: rate of change of permittivity Deltaε/Deltat of the object to be treated; abscissa: thawing time t of the object to be treated, in min). Referring to fig. 5, in some preferred embodiments, the rf generation module 130 may be configured to reduce the operating power by 30% -40%, for example, 30%, 35% or 40%, when the change rate Δ ∈/Δ t of the dielectric coefficient of the object to be processed is greater than or equal to the first rate threshold, so as to prevent the object to be processed from being excessively thawed (as will be understood by those skilled in the art, the excessively thawed object is greater than 0 ℃). The first rate threshold may be 15-20, such as 15, 17, 18, or 20. The RF generation module 130 can be further configured to stop operating when the rate of change of the permittivity Δ ε/Δ t of the object to be treated drops to less than or equal to a second rate threshold. The second rate threshold may be 1-2, such as 1, 1.5, or 2.
It is known to those skilled in the art that the dielectric constant of the object to be treated may vary with the temperature of the object to be treated, however, the dielectric constant is usually measured by a special instrument (such as a dielectric constant tester), and the special instrument occupies a large space and is high in cost, and is not suitable for a thawing apparatus with a small size. The dielectric coefficient of the object to be processed is obtained by detecting the incident wave signal and the reflected wave signal of the electric connecting line connecting the radio frequency generation module 130 and the upper electrode plate and calculating, so that the invention has small occupied space and low cost and is particularly suitable for a thawing device. According to the invention, the difference between the load impedance and the output impedance of the radio frequency generation module 130 is within a preset range (greater than or equal to a first impedance threshold and less than or equal to a second impedance threshold) through the load compensation module 160, so that the thawing efficiency of the object to be treated is improved.
Further, the invention judges the thawing progress of the object to be treated by calculating the change rate of the dielectric coefficient of the object to be treated through the detection module 150. Prior to the present invention, it was generally believed by those skilled in the art that when the temperature of the treatment was high (i.e., the temperature of the treatment was-7℃. or higher), the thermal effects would be significantly attenuated and the treatment would not be excessively thawed. However, this is not the case, and the rf thawing power is usually large, for example, greater than 100W, and when the temperature of the object to be treated is already high, the object to be treated is easily over-thawed. The inventor of the present application has creatively recognized that, when the temperature of the object to be treated is high, the operating power of the rf generating module 130 is reduced by 30-40%, which can effectively prevent the object to be treated from being excessively thawed. Furthermore, the invention judges whether the unfreezing is finished or not according to the change rate of the dielectric coefficient of the object to be treated, compared with the prior art that whether the unfreezing is finished or not is judged by sensing the temperature of the object to be treated, the judgment is more accurate, the object to be treated can be further prevented from being excessively unfrozen, and tests show that the object to be treated unfrozen by the unfreezing device has the temperature of-4 to-2 ℃ generally when the unfreezing is finished, and the generation of blood water during unfreezing when the object to be treated is meat can be avoided.
Fig. 2 is a schematic cross-sectional view taken along a sectional line a-a in fig. 1. Referring to fig. 1 and 2, the drum 110 may further include a vertical partition 111 and a horizontal partition 112 for defining an inner space of the drum 110. The vertical partition 111 may be provided to extend from a top plate of the cylinder 110 to a bottom plate of the cylinder 110 in a vertical direction. The rf generation module 130 may be disposed between the vertical partition 111 and the rear plate of the cylinder 110. The horizontal partition 112 may be provided 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 and two lateral side plates of the drum 110. The upper electrode plate 140a may be disposed on a lower surface of the horizontal partition 112, and the lower electrode plate 140b may be disposed on an upper surface of the bottom plate of the cylinder 110. The vertical partition 111 may be opened with a first wire through port 1112, so that the rf generation module 130 is electrically connected to the upper electrode plate 140a through the first wire through port 1112. The barrel 110 may further include a baffle 113 extending vertically upward from the front side end of the horizontal partition 112 to the top plate of the barrel 110 to prevent the detection module 150 and the load compensation module 160 from being exposed and to reduce the aesthetic appearance of the thawing apparatus 100. In other embodiments, the horizontal partition 112 may be disposed to extend forward from the rear plate of the cylinder 110 in the horizontal direction, and the vertical partition 111 may be disposed to extend from the horizontal partition 112 to the bottom plate of the cylinder 110 in the vertical direction, according to the actual situation (the size of the rf generation module 130 and the detection module 150, and the load compensation module 160).
In some embodiments, the rear plate of the drum 110 may be formed with a device inlet 115, and the vertical partition 111 at the rear side of the thawing chamber 114 may be formed with a thawing inlet 1111, so that air outside the thawing device 100 enters the thawing chamber 114 of the thawing device 100 through the device inlet 115 and the thawing inlet 1111. The lateral plates of the barrel 110 may be provided with device outlets 118, so that the gas in the thawing chamber 114 can be discharged out of the thawing device 100 through the device outlets 118.
In some preferred embodiments, the device air inlet 115 and the thawing air inlet 1111 of the thawing device 100 may be respectively disposed at both lateral sides of the rf generation module 130 to facilitate heat dissipation of the rf generation module 130. In some alternative embodiments, the device intake vent 115 and the thaw intake vent 1111 of the thawing device 100 may be disposed on the same side of the rf generation module 130.
According to the invention, the device air inlet 115 and the device air outlet 118 are arranged on the unfreezing device 100, so that the unfreezing chamber 114 can be used for placing food materials when a unfreezing instruction is not received, and the storage space in the unfreezing device 100 is fully utilized.
The thawing apparatus 100 may further comprise a tray 170. A tray 170 is disposed in the thawing chamber 114, and the object to be processed is placed on the tray 170. The tray 170 may be configured to be controllably moved in the depth direction of the thawing chamber 114 to facilitate placement and removal of the item to be treated. In some preferred embodiments, the distance between the lower surface of the tray 170 and the lower electrode plate 140b may be 8-12 mm, such as 8mm, 10mm, 12mm, to prevent friction with the lower electrode plate 140b during the drawing of the tray 170.
Referring to fig. 1 and 3, the can 110 and the device door 120 may 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 can be electrically connected to reduce the amount of outward magnetic leakage of the thawing 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 (surface facing the cylinder 110) of the door assembly 120, a conductive metal mesh attached to the inner wall of the cylinder 110 and the inner surface of the door assembly 120, or a conductive metal mesh formed among the respective plate bodies surrounding the cylinder 110 and in the door assembly 120, etc.
In some preferred embodiments, the thawing apparatus 100 may further comprise an elastic conductive loop 180. The elastic conductive ring 180 may be disposed at a periphery of the front opening of the thawing chamber 114, so that the elastic conductive ring 180 may be pressed and deformed when the door 120 is closed, and tightly attached to the door 120, i.e., a seal is formed between the elastic conductive ring 180 and the 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 disposed in conductive contact with the elastic conductive ring 180, respectively, so as to reduce the amount of outward magnetic leakage of the thawing device 100 when the device door 120 is closed. In some preferred embodiments, the elastic conductive loop 180 may be made of silicone, silicone fluoride, EPDM, fluorocarbon-silicon fluoride, and silver-plated aluminum. The elastic conductive ring 180 may have a hollow ring structure, so that it can be tightly attached to the door 120 when the door 120 is closed. The width of the elastic conductive ring 180 may be 20-30 mm, such as 20mm, 25mm or 30mm, to improve the sealing performance of the thawing apparatus 100. In some preferred embodiments, the device intake vent 115, the thawing intake vent 1111, and the device exhaust vent 118 of the thawing apparatus 100 may each be provided with a conductive metal mesh 190, and the conductive metal mesh 190 may be provided in conductive connection with the electromagnetic shielding feature 117 provided to the barrel 110 to reduce the amount of magnetic leakage of the thawing apparatus 100.
Particularly, in the present invention, the frequency of the rf signal (i.e. the electromagnetic wave for thawing the object to be treated) generated by the rf generating module 130 may be 40-42 MHz, such as 40MHz, 40.48MHz, 40.68MHz, 41MHz or 42MHz, so as to 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 thereof. In a preferred embodiment, the frequency of the RF wave can be a predetermined fixed frequency within a range of 40.48-40.68 MHz, so as 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 thereof. Among them, when the frequency of the radio frequency wave is 40.68MHz, the thawing effect is best.
For a further understanding of the present invention, preferred embodiments of the present invention are described below with reference to more specific examples, but the present invention is not limited to these examples.
TABLE 1
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | Comparative example 2 | |
| Frequency (MHz) | 40 | 40.48 | 40.68 | 41 | 42 | 13.56 | 27.12 |
In the thawing apparatus 100 respectively provided with the rf frequencies of the above-described embodiments 1 to 5 and comparative examples 1 to 2, the power of the rf wave is 100W, and the structure and the operation flow of the thawing apparatus 100 are the same.
The thawing apparatus 100 provided with the frequencies of the respective embodiments and the respective comparative examples was subjected to a thawing effect test. Description of the test: 1kg of beef with the same shape and specification and an initial temperature of-18 ℃ is selected and placed on the tray 170 in the thawing apparatus 100 of each embodiment and each proportion respectively, and the thawing time, the temperature uniformity and the juice loss rate of each embodiment and each proportion are measured respectively. Wherein the thawing time is the time from the beginning of thawing to the time when the thawing apparatus 100 judges that the thawing is completed (i.e. the rf generation module 130 stops working); temperature uniformity: after thawing, respectively measuring the temperatures of four corners and a central point of the beef, and calculating the difference value between the temperature of the central point and the average value of the four corners, wherein the temperature uniformity is the ratio of the difference value to the average value; juice loss rate: and respectively measuring the weight of the beef before thawing and the weight of the beef after thawing, and calculating the difference between the two weights, wherein the juice loss rate is the ratio of the difference to the weight of the beef before thawing.
The results of the thawing effect test according to examples 1 to 7 and according to comparative examples 1 to 2 are shown in table 2.
TABLE 2
| Thawing time (min) | Temperature uniformity | Juice loss (%) | |
| 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 | 23 | 0.6 | 0.40 |
According to the test results of the example 5 and the comparative example 1 in table 2, under the same power of the rf wave and the same structure of the thawing apparatus 100 and the same work flow, the thawing apparatus 100 using the rf frequency within the range of the embodiment of the present invention has better thawing effect than the thawing apparatus 100 using the rf frequency in the prior art under the same test conditions, the former has a 20% shorter thawing time and the temperature uniformity has an improved 17% compared to the latter.
As can be seen from the test results of examples 1 to 5 in table 2, the thawing time of the thawing apparatus 100 according to the embodiments of the present invention is 20min or less, the temperature uniformity is 0.5 or less, and the juice loss rate is 0.40% or less. By further optimizing the frequency of the radio frequency (for example, the radio frequency is 40.48 to 40.68MHz), the thawing time of the thawing apparatus 100 can be reduced to less than 18min, the temperature uniformity can be improved to less than 0.4, and the juice loss rate can be reduced to less than 0.32%.
Fig. 6 is a flowchart of a thawing method for the thawing apparatus 100 according to an embodiment of the present invention. Referring to fig. 6, the thawing method of the thawing apparatus 100 of the present invention may include the steps of:
step S602: judging whether the radio frequency generation module 130 is in a working state, if so, executing step S604; if not, go to step S606.
Step S604: the locking device operates to lock the cylinder 110 and the device door 120.
Step S606: the locking device is not operated, and the device door 120 can be controlled to open.
The present invention may also provide a refrigerator 10 based on the thawing apparatus 100 of any of the foregoing embodiments. Fig. 7 is a schematic structural view of the refrigerator 10 according to an embodiment of the present invention, in which all external door bodies of the refrigerator 10 are removed to show a compartment structure inside the cabinet 200 of the refrigerator 10; fig. 8 is a schematic sectional view of the refrigerator 10 shown in fig. 7. Referring to fig. 1, 7 and 8, the refrigerator 10 may generally include a cabinet 200 defining at least one receiving space, compartment doors for respectively opening and closing access ports of the respective receiving spaces, and a thawing apparatus 100 provided in one receiving space. In the illustrated embodiment, the number of thawing devices 100 is one. The number of the accommodating spaces of the refrigerator 10 may be three, and the three accommodating spaces are respectively a refrigerating chamber 210, a variable temperature chamber 220, and a freezing chamber 230, and a refrigerating door body 211, a variable temperature door body 221, and a freezing door body 231 for opening and closing the refrigerating chamber 210, the variable temperature chamber 220, and the freezing chamber 230, respectively, and the thawing device 100 is disposed in the variable temperature chamber 220. The thawing apparatus 100 can be fixed in the temperature-changing compartment 220 by interference fit or snap-fit with the inner walls of the two vertical sides of the temperature-changing compartment 220.
In addition, as well known to those skilled in the art, the refrigerating compartment 210 is a storage compartment for preserving food materials at a preservation temperature of 0 to +8 ℃; the freezing chamber 230 is a storage chamber with the preservation temperature of food materials of-20 to-15 ℃; the temperature-changing chamber 220 is a storage chamber capable of changing the storage temperature in a wide range (for example, the adjustment range can be above 4 ℃ and can be adjusted to above 0 ℃ or below 0 ℃), and the storage temperature can generally span the refrigeration temperature, the soft freezing temperature (generally-4 to 0 ℃) and the freezing temperature, and is preferably-16 to +4 ℃.
The rear plate of the barrel 110 may be spaced from the rear wall of the temperature change compartment 220 to facilitate the entry of air in the temperature change compartment 220 into the thawing apparatus 100. The lateral plates at two lateral sides of the cylinder 110 may have a gap with the lateral walls at two lateral sides of the temperature-changing chamber 220, so that the gas in the thawing apparatus 100 is discharged into the temperature-changing chamber 220. When the refrigerator 10 is a direct-cooling refrigerator, the rear wall of the temperature-changing chamber 220 is the rear wall of the inner container thereof; when the refrigerator 10 is an air-cooled refrigerator, the rear wall of the temperature-varying chamber 220 is the front surface of the cover plate of the inner air duct. In some preferred embodiments, the distance between the rear plate and the lateral side plates of the barrel 110 and the rear wall and the lateral side walls of the temperature-varying chamber 220 can be 2-3 mm, such as 2mm, 2.5mm or 3mm, so as to ensure that the thawing chamber 114 has a larger effective volume while ensuring that the thawing apparatus 100 has a proper air intake and air output.
In some embodiments, the refrigerator 10 according to the present invention may be an air-cooled refrigerator, and the temperature-varying compartment 220 may include an air duct cover. The air duct cover plate and the rear wall of the liner of the temperature-varying chamber 220 are clamped to form a temperature-varying air duct, and the air duct cover plate is provided with a temperature-varying air inlet for providing cold energy for the temperature-varying chamber 220.
In some preferred embodiments, the device inlet 115 and the temperature change inlet of the thawing device 100 may be connected by a connection tube to facilitate refrigeration of the thawing chamber 114 of the thawing device 100. In other preferred embodiments, the projection of the device air inlet 115 of the thawing device 100 in the thickness direction of the rear plate of the cylinder 110 can be located in the temperature-variable air inlet so as to refrigerate the thawing chamber 114 of the thawing device 100.
In some embodiments, a defrost switch 224 for controlling the start or stop of a defrost sequence may be provided on any one of the compartment door bodies. The RF generation module 130 may be configured to begin operation when the defrost switch 224 is open; when the thaw switch 224 is closed, the operation is stopped. During the thawing process, the user may terminate the thawing process by closing the thaw switch 224. Any one compartment door body can be also provided with a buzzer (not shown in the figure) for reminding a user that the object to be treated is thawed. The buzzer can be configured to start to work when the detection module 150 judges that the object to be processed is unfrozen (when the change rate of the dielectric coefficient of the object to be processed is reduced to be less than or equal to a second rate threshold value); when the object to be processed is taken out of the thawing chamber 114, the operation is stopped. An infrared sensor may be disposed on an inner wall of the thawing chamber 114 to sense whether the object to be treated is placed in the thawing chamber 114. In some preferred embodiments, the refrigeration system of the refrigerator 10 may be configured to stop providing the cooling capacity to the accommodating space where the thawing apparatus 100 is provided when the thawing switch 224 is turned on; when the thawing switch 224 is turned off, the cooling capacity (i.e., the original cooling program for operating the refrigerator 10) of the accommodating space in which the thawing apparatus 100 is disposed can be controllably supplied to reduce the influence of the cooling system of the refrigerator 10 on the temperature of the thawing chamber 114 when the thawing apparatus 100 thaws the object to be processed. Wherein the refrigeration system of the refrigerator 10 may include a compressor, a condenser, a capillary tube, and an evaporator for providing refrigeration.
Fig. 9 is a schematic structural view of the compressor room 240 in fig. 8. Referring to fig. 9, the cabinet 200 of the refrigerator 10 further defines a compressor chamber 240. The compressor chamber 240 may include a main control panel 243 for controlling the operation of the refrigerator 10, a compressor 241, a condensed water collecting structure 244, and an external power line (not shown) for supplying power for the operation of the refrigerator 10, which are sequentially disposed. In some embodiments, the refrigerator 10 may further include a power module 242 for supplying power to the rf generation module 130. The power supply module 242 may be disposed within the compressor compartment 240 of the refrigerator 10 to facilitate heat dissipation and maintenance of the power supply module 242. The rear plate of the barrel 110 may be formed with a second wire port 116 so that the slave power module 242 is electrically connected to the rf generation module 130 through the second wire port 116. The power module 242 may be fixed to an upper wall of the compressor compartment 240 to facilitate electrical connection of the rf generation module 130 to the power module 242. In some embodiments, the power supply module 242 may be a DCDC converter. The DCDC converter may be provided to be electrically connected with the main control board 243 to supply power to the thawing apparatus 100. The DCDC converter may be disposed between the main control board 243 and the compressor 241 to facilitate electrical connection with the main control board 243. In other embodiments, the power module 242 may be an ACDC converter. The ACDC converter may be configured to electrically connect to an external power source of the refrigerator 10. Those skilled in the art will appreciate that it is easy to connect the various components of the defrosting apparatus 100 to the control circuit of the refrigerator 10.
Fig. 10 is a detailed flowchart of a thawing method for the refrigerator 10 according to an embodiment of the present invention. Referring to fig. 10, the thawing method of the refrigerator 10 of the present invention may include the steps of:
step S1002: judging whether the unfreezing switch 224 is turned on, if so, executing step S1004; if not, go to step S1002.
Step S1004: the power supply module 242 starts operating.
Step S1006: judging whether the device door body 120 is closed, if so, executing step S1008; if not, go to step S1006. In this step, the open/close state of the door 120 may be detected by the door opening detection device. The door opening detection device can detect by using a fan-shaped switch, a magnetic sensitive switch, a hall switch and other modes, and generates different electric signals when the device door body 120 is completely closed or opened so as to indicate the state of the device door body 120.
Step S1008: the refrigeration system stops providing cold energy for the accommodating space provided with the thawing device 100, the radio frequency generation module 130 generates a radio frequency signal of 40-42 MHz, the locking device starts working, and the detection module 150 detects an incident wave signal and a reflected wave signal of an electric connection line connecting the radio frequency generation module 130 and the upper electrode plate 140 a. Step S1010 and step S1011 are executed. In this step, the thawing apparatus 100 is disposed in the temperature-varying compartment 120, and the rf generation module 130 generates an rf signal of 40.68 MHz.
Step S1010: and acquiring the voltage and the current of the incident wave signal and the voltage and the current of the reflected wave signal, and calculating the change rate delta epsilon/delta t of the dielectric coefficient of the object to be processed.
Step S1012: judging whether the change rate delta epsilon/delta t of the dielectric coefficient of the object to be processed is larger than or equal to a first rate threshold value, if so, executing a step S1014; if not, go to step S1010.
Step S1014: the working power of the rf generation module 130 is reduced by 30-40%. In this step, the operating power of the rf generation module 130 may be reduced by 35%.
Step S1016: and acquiring the voltage and the current of the incident wave signal and the voltage and the current of the reflected wave signal, and calculating the change rate delta epsilon/delta t of the dielectric coefficient of the object to be processed.
Step S1018: judging whether the change rate delta epsilon/delta t of the dielectric coefficient of the object to be processed is less than or equal to a second rate threshold value, if so, executing a step S1020; if not, go to step S1016.
Step S1020: the power supply module 242 is deactivated, the defrost switch 224 is reset (i.e., turned off), the locking device is deactivated, the original refrigeration program of the refrigerator 10 is run, and the buzzer is activated.
Step S1022: judging whether the object to be processed is taken out from the unfreezing chamber 114, if so, executing step S1024; if not; step S1022 is performed.
Step S1024: the buzzer stops working.
Step S1011: obtaining the voltage and current of the incident wave signal and the voltage and current of the reflected wave signal, and calculating the load impedance Z of the RF generation module 1302。
Step S1013: determining the load impedance Z of the RF generating module 1302And an output impedance Z1If the difference is smaller than the first impedance threshold, if yes, go to step S1015; if not, go to step S1017.
Step S1015: the motor 162 of the load compensation module 160 operates to increase the impedance of the compensation unit 161. The process returns to step S1011.
Step S1017: determining the load impedance Z of the RF generating module 1302And an output impedance Z1If the difference is greater than the second impedance threshold, if yes, go to step S1019; if not, go to step S1011.
Step S1019: the motor 162 of the load compensation module 160 operates to reduce the impedance of the compensation unit 161. The process returns to step S1011.
As will be understood by those skilled in the art, when the program is executed to step S1020, the power supply module 242 stops operating, i.e., stops supplying power, the rf generation module 130, the detection module 150 and the load compensation module 160 all stop operating, i.e., when the change rate Δ ∈/Δ t of the dielectric constant of the object to be processed decreases to be equal to or less than the second rate threshold, the detection module 150 stops detecting the incident wave signal and the reflected wave signal of the electrical connection line connecting the rf generation module 130 and the upper electrode plate 140a, and the load compensation module 160 stops operating.
One defrosting workflow of the refrigerator 10 of one embodiment of the present invention may include: when the user opens the defrosting switch 224 and the device door body 120 is closed, the power supply module 242 starts to supply power, the locking device locks the barrel 110 and the device door body 120, the refrigeration system stops supplying cold energy to the accommodating space provided with the defrosting device 100, the radio frequency generation module 130 generates a radio frequency signal of 40.68MHz, and the detection module 150 and the load compensation module 160 start to work. The detection module 150 detects an incident wave signal and a reflected wave signal of an electrical connection line connecting the rf generation module 130 and the upper electrode plate 140a, and calculates a load impedance Z of the rf transmitter 1302And the rate of change of the dielectric constant Δ ε/Δ t. When the change rate delta epsilon/delta t of the dielectric coefficient of the object to be processed is larger than or equal to the first rate threshold, the working power of the radio frequency generation module 130 is reduced by 35 percent, and simultaneously, in the whole defrosting work flow, when the load impedance Z of the radio frequency generation module 130 is2And an output impedance Z1When the difference is smaller than the first impedance threshold or larger than the second impedance threshold, the load compensation module 160 adjusts the impedance of the compensation unit 161 through the motor 162, and further adjusts the load impedance Z of the rf generation module 1302Make the load impedance Z of the RF generation module 1302And an output impedance Z1The difference is always greater than or equal to the first impedance threshold and less than or equal to the second preset threshold. When the change rate delta epsilon/delta t of the dielectric coefficient of the object to be processed is less than or equal to the second rate threshold, the power supply module 242 stops supplying power, the original refrigeration program of the refrigerator 10 is operated, and the radio frequency generation module 130, the detection module 150 and the load are operatedThe compensation module 160 and the locking device stop working, and the buzzer starts working. When the user takes out the object to be processed from the thawing chamber 114, the buzzer stops operating.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (8)
1. A thawing method for a thawing device, the thawing device comprises a barrel body which is limited with a thawing chamber used for placing an object to be treated and provided with a front opening, a device door body which is arranged at the front opening of the thawing chamber and used for opening and closing the thawing chamber, a radio frequency generation module, an upper electrode plate and a lower electrode plate which are respectively and horizontally arranged at the top wall and the bottom wall of the thawing chamber and are respectively and electrically connected with the radio frequency generation module, and a locking device used for locking the barrel body and the device door body; the thawing method comprises the following steps:
judging whether the radio frequency generation module is in a working state;
if the radio frequency generation module is in a working state, the locking device works;
if the radio frequency generation module is not in a working state, the locking device does not work; wherein the thawing method further comprises:
obtaining the change rate of the dielectric constant of the object to be processed;
when the change rate of the dielectric coefficient of the object to be processed is changed to be more than or equal to a first rate threshold, the working power of the radio frequency generation module is reduced by 30-40%;
and when the change rate of the dielectric coefficient of the object to be processed is reduced to be less than or equal to a second rate threshold, the radio frequency generation module stops working.
2. The thawing method for a thawing apparatus according to claim 1, further comprising a detection module configured to detect an incident wave signal and a reflected wave signal of an electrical connection line connecting the radio frequency generation module and the upper electrode plate; the thawing method comprises the following steps:
when the radio frequency generation module is in a working state, detecting an incident wave signal and a reflected wave signal of the electric connection line;
acquiring voltage and current of the incident wave signal and voltage and current of the reflected wave signal;
and calculating the load impedance of the radio frequency generation module.
3. The thawing method for a thawing apparatus according to claim 2, further comprising a load compensation module including 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 comprises the following steps:
acquiring the load impedance of the radio frequency generation module;
judging whether the difference between the load impedance and the output impedance of the radio frequency generation module is greater than or equal to a first impedance threshold value and less than or equal to a second impedance threshold value; wherein the first impedance threshold is less than the second impedance threshold;
if the difference between the load impedance and the output impedance of the radio frequency generation module is smaller than the first impedance threshold value, increasing the impedance of the compensation unit;
if the difference between the load impedance and the output impedance of the radio frequency generation module is greater than the second impedance threshold, reducing the impedance of the compensation unit;
and if the difference between the load impedance and the output impedance of the radio frequency generation module is greater than or equal to the first impedance threshold and less than or equal to the second impedance threshold, the load compensation module does not work.
4. The thawing method for thawing apparatus according to claim 2, wherein
And the change rate of the dielectric coefficient of the object to be processed is calculated according to the load impedance of the radio frequency generation module.
5. The thawing method for a thawing apparatus according to claim 1, further comprising:
if the change rate of the dielectric coefficient of the object to be processed is reduced to be less than or equal to a second rate threshold, sending out a visual and/or auditory signal to remind a user;
the emission of the visual and/or acoustic signal is stopped if the object to be treated is removed in a controlled manner from the thawing chamber.
6. A thawing method for a refrigerator including a case defining at least one accommodation space, compartment doors for opening and closing the accommodation spaces, respectively, and a thawing apparatus provided in one of the accommodation spaces, the thawing method for a refrigerator comprising the thawing method for a thawing apparatus according to any one of claims 1 to 5.
7. The thawing method for the refrigerator according to claim 6, wherein a thawing switch for controlling the start and stop of a thawing program is arranged on any one of the compartment door bodies; wherein the thawing method for the refrigerator comprises:
if the unfreezing switch is turned on, the radio frequency generation module starts to work;
and if the unfreezing switch is closed, the radio frequency generation module stops working.
8. The thawing method for a refrigerator according to claim 7, further comprising:
if the unfreezing switch is turned on, the refrigerator stops providing cold energy for the accommodating space provided with the unfreezing device;
and if the unfreezing switch is closed, the refrigerator runs the original refrigeration program.
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| CN112996158B (en) * | 2019-12-13 | 2022-04-29 | 青岛海尔电冰箱有限公司 | Control method for heating device and heating device |
| CN113015281A (en) * | 2019-12-19 | 2021-06-22 | 江苏麦克威微波技术有限公司 | Microwave thawing method |
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