CN109000401A - Refrigerator - Google Patents

Abstract

The invention provides a refrigerator. The refrigerator comprises a casing defining a refrigerating compartment and a freezing compartment distributed sequentially along the vertical direction of the refrigerator, and a thawing device. A vertical beam is respectively arranged in the refrigerating compartment and the freezing compartment to separate the refrigerating compartment and the freezing compartment. The chamber is divided into left and right chambers. The thawing device includes: a cylinder body defining a thawing chamber with a forward opening; a device door disposed at the forward opening of the thawing chamber for opening and closing the thawing chamber; a radio frequency generator configured to generate a radio frequency signal and the upper and lower electrode plates which are respectively arranged horizontally on the top and bottom walls of the thawing chamber and are electrically connected to the radio frequency generation module, so as to generate radio frequency waves of corresponding frequencies in the thawing chamber according to the radio frequency signal, and thaw The object to be treated in the chamber is thawed, and the thawing device is arranged in the freezer chamber. In the present invention, the thawing device is arranged in the freezer compartment of the refrigerator, which is convenient for users to pick and place objects to be processed, and improves the convenience of users.

Description

refrigerator

technical field

The invention relates to the field of thawing, in particular to a refrigerator with a quick thawing function.

Background technique

During the freezing process of food, the quality of food is maintained, but frozen food needs to be thawed before processing or consumption. In order to facilitate users to freeze and thaw food, in the prior art, a heating device or a microwave device is generally provided in the refrigerator to thaw the food.

However, thawing food through a heating device generally requires a long thawing time, and the thawing time and temperature are not easy to control, which will easily cause water evaporation and juice loss in the food, resulting in loss of food quality; It is fast and efficient, so the loss of nutrients in food is very low. However, due to the difference in the penetration and absorption of water and ice by microwaves, and the uneven distribution of internal substances in food, the melted area absorbs more energy and is prone to thawing. Problems with uneven and localized overheating. Considering comprehensively, a refrigerator with high thawing efficiency, uniform thawing and guaranteed food quality is required in design.

Contents of the invention

An object of the present invention is to provide a refrigerator in which defrosting is facilitated.

A further object of the present invention is to avoid excessive thawing of the material to be treated.

In particular, the present invention provides a refrigerator, comprising a box body defining a refrigerating compartment and a freezing compartment sequentially distributed along the vertical direction of the refrigerator, and a thawing device, the refrigerating compartment and the freezing compartment being respectively A vertical beam is provided to separate the refrigerated compartment and the frozen compartment into two left and right compartments respectively; wherein the thawing device includes:

The cylinder body defines a thawing chamber with a forward opening, and the thawing chamber is used to place the object to be treated;

The door body of the device is arranged at the forward opening of the thawing chamber, and is used to open and close the thawing chamber;

a radio frequency generation module configured to generate a radio frequency signal; and

The upper electrode plate and the lower electrode plate are horizontally arranged on the top wall and the bottom wall of the thawing chamber, respectively, and are respectively electrically connected to the radio frequency generating module, so as to generate in the thawing chamber according to the radio frequency signal radio frequency waves of a corresponding frequency, and thaw the to-be-processed object in the thawing chamber; and

The thawing device is arranged in the freezing compartment.

Optionally, the rear plate of the cylinder is provided with a device air inlet, and there is a gap between the rear plate of the cylinder and the rear wall of the freezing compartment, so that the air in the freezing compartment passes through the The air inlet of the device enters into the thawing chamber; and

The side plates on both lateral sides of the cylinder are provided with device air outlets, and there are gaps between the side plates on both lateral sides of the cylinder and the side walls on both lateral sides of the freezing compartment, so that the The gas in the thawing chamber is discharged to the freezing compartment through the air outlet of the device.

Optionally, the distance between the rear wall and side plates on both lateral sides of the cylinder and the rear wall and side walls on both lateral sides of the corresponding freezing compartment is 2-3 mm.

Optionally, the refrigerator is an air-cooled refrigerator;

The refrigerated compartment includes an air duct cover plate, which is interposed with the inner tank rear wall of the refrigerated compartment to form a refrigerated air duct, and the air duct cover plate is provided with a refrigerated air inlet for said freezer compartment provides cooling; and

The left and right compartments of the freezing compartment respectively define a plurality of accommodation spaces, and the freezing air inlet is arranged in the uppermost accommodation space of the left compartment of the freezing compartment;

The thawing device is arranged in the uppermost accommodating space, so that the freezing air duct provides cooling capacity for the thawing device.

Optionally, the projection of the device air inlet in the thickness direction of the air duct cover plate is inside the freezing air inlet, so that the freezing air duct can provide cooling capacity for the thawing device.

Optionally, the refrigerator further includes a refrigerator door body and a freezer door body for respectively opening and closing the left and right compartments of the refrigerator compartment and the freezer compartment, wherein

Any of the refrigerated doors is provided with a thawing switch for controlling the start or stop of the thawing program, so as to adjust the thawing switch; and the radio frequency generating module is configured as:

When the thawing switch is turned on, start working;

When the thawing switch was turned off, it stopped working.

Optionally, the thawing device also includes:

An infrared sensor is arranged on the inner wall of the thawing chamber to sense whether the object to be treated is placed in the thawing chamber.

Optionally, the refrigerator is configured as:

When the defrosting switch is turned on, stop providing cold energy to the freezing compartment;

When the object to be treated is taken out from the thawing chamber, the original refrigeration program of the refrigerator is run;

When the object to be treated has not been removed from the thawing chamber for a time greater than or equal to a predetermined time threshold after the thawing is completed, cooling capacity is provided for the freezing compartment.

Optionally, the refrigerator also includes:

The detection module is configured to detect the incident wave signal and the reflected wave signal of the electrical connection connecting the radio frequency generation module and the upper electrode plate, and according to the voltage and current of the incident wave signal and the reflected wave signal The voltage and current are used to calculate the change rate of the dielectric coefficient of the object to be treated, so as to judge the thawing progress of the object to be treated.

Optionally, the radio frequency generation module is configured as:

When the change rate of the dielectric coefficient of the object to be treated is greater than or equal to the first rate threshold, its working power is reduced by 30% to 40%, so as to prevent the object to be treated from being excessively thawed; and/or

When the change rate of the dielectric coefficient of the object to be processed drops to less than or equal to the second rate threshold, stop working.

In the present invention, the thawing device is arranged in the freezer compartment of the refrigerator, which is convenient for users to pick and place objects to be processed, and improves the convenience of users.

Further, the present invention judges the thawing progress of the object to be processed by calculating the change rate of the dielectric coefficient of the object to be processed by the detection module. Before the present invention, those skilled in the art generally believed that when the temperature of the object to be treated was high (that is, the temperature of the object to be treated was greater than or equal to -7°C), the thermal effect would be significantly attenuated, so that the object to be treated would not be thawed excessively . However, the actual situation is not the case. Generally, the radio frequency thawing power is relatively high, such as greater than 100W. When the temperature of the object to be treated is already high, the object to be treated is easily thawed excessively. The inventors of the present application creatively realized that when the temperature of the object to be treated is already high, reducing the working power of the radio frequency generating module by 30-40% can effectively prevent the object to be treated from being thawed excessively. Furthermore, the present invention judges whether the thawing is completed by the rate of change of the dielectric coefficient of the object to be treated. Compared with the prior art, which judges whether the thawing is completed by sensing the temperature of the object to be processed, the judgment is more accurate and can further prevent the The processed object has been thawed too much, and the test shows that the temperature of the processed object thawed by the thawing device of the present invention is generally -4~-2°C, which can avoid bloody water when the object is thawed when the object is meat.

Those skilled in the art will be more aware of the above and other objects, advantages and features of the present invention according to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of illustration and not limitation with reference to the accompanying drawings. The same reference numerals in the drawings designate the same or similar parts or parts. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the attached picture:

Fig. 1 is a schematic structural diagram of a refrigerator according to an embodiment of the present invention, wherein all outer doors of the refrigerator are removed to show the compartment structure in the refrigerator box;

Fig. 2 is a schematic sectional view taken along line A-A in Fig. 1;

Fig. 3 is a schematic partial enlarged view of area B in Fig. 2;

Fig. 4 is a schematic sectional view taken along line C-C in Fig. 3;

Fig. 5 is a graph of the rate of change of the dielectric coefficient of the object to be treated according to an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of the compressor room in Fig. 2;

Fig. 7 is a schematic structural diagram of the thawing device in Fig. 3, wherein the device door of the thawing device is removed to show the internal structure of the cylinder;

FIG. 8 is a flowchart of a defrosting method for a refrigerator according to an embodiment of the present invention.

Detailed ways

Fig. 1 is a schematic structural diagram of a refrigerator according to an embodiment of the present invention, wherein all outer doors of the refrigerator are removed to show the compartment structure in the refrigerator box; Fig. 2 is along the section line in Fig. 1 A schematic cross-sectional view taken from A-A; FIG. 3 is a schematic partial enlarged view of area B in FIG. 2 . Referring to FIGS. 1 to 3 , the refrigerator 10 may include a box body 100 defining a refrigerating compartment 110 and a freezing compartment 120 sequentially distributed along a vertical direction of the refrigerator 10 , and a thawing device 200 . A vertical beam 130 may be provided in the refrigerated compartment 110 and the freezer compartment 120 respectively to separate the refrigerated compartment 110 and the freezer compartment 120 into left and right compartments. The refrigerator 10 may further include a refrigerating door 111 and a freezing door 121 for opening and closing two left and right compartments of the refrigerating compartment 110 and the freezing compartment 120 respectively. In particular, the thawing device 200 may be disposed in the freezing compartment 120 . The thawing device 200 can be fixed in the freezer compartment 120 by means of interference fit, lap joint or snap joint. In the present invention, the thawing device 200 is arranged in the freezing compartment 120 of the refrigerator 10, which is convenient for the user to take and place the object to be processed, and improves the convenience of the user. Then start the defrosting process.

In addition, it can also be explained that, as is well known to those skilled in the art, the refrigerated compartment 110 refers to a storage compartment with a preservation temperature of 0°C to +8°C for food materials; the freezer compartment 120 refers to a storage compartment with a preservation temperature of It is a storage room at -20～-15℃.

Specifically, the thawing device 200 may include a barrel body 210, a device door body 220, a radio frequency generating module 230, and an upper electrode plate 240a and a lower electrode plate 240b. The cylinder body 210 may include a top board, a bottom board, a rear board and two opposite lateral side boards, and a thawing chamber 214 with a front opening may be defined therein, and the thawing chamber 214 is used for placing objects to be processed. The device door 220 can be disposed at the front opening of the thawing chamber 214 for opening or closing the thawing chamber 214 . The device door body 220 can be installed together with the barrel body 210 by a suitable method, such as a left-handed door, a right-handed door, an upper-handed door or a sliding door. The radio frequency generating module 230 can be configured to generate radio frequency signals (generally refer to radio frequency signals with a frequency of 300KHz-300GHz). The upper electrode plate 240a and the lower electrode plate 240b can be horizontally arranged at the top wall and the bottom wall of the thawing chamber 214 respectively, and are electrically connected with the radio frequency generating module 230 respectively, so that the radio frequency signal generated by the radio frequency generating module 230 can be used in the thawing chamber. Radio frequency waves with corresponding parameters are generated in the chamber 214 to thaw the objects to be treated placed in the thawing chamber 214 . In the present invention, the upper electrode plate 240a is a transmitting antenna; the lower electrode plate 240b is a receiving antenna. In some embodiments, the upper electrode plate 240 a and the lower electrode plate 240 b can be electrically connected to the radio frequency generating module 230 by using 50 ohm electrical wires.

In some embodiments, the thawing device 200 may further include a detection module 250 . The detection module 250 can be configured to detect the incident wave signal and the reflected wave signal of the electrical connection connecting the radio frequency generating module 230 and the upper electrode plate 240a, and calculate The load impedance of the radio frequency generating module 230 . The formula for calculating the load impedance is as follows:

SWR＝Z ₂ /Z _l (1)

Z _l ＝U _l /I _I ＝R _I +jX _l (2)

Z ₂ =U ₂ /l ₂ =R ₂ +jX ₂ (3)

In formulas (1), (2) and (3): 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 reactance; U ₂ is the reflected wave voltage; I ₂ is the reflected wave current; R ₂ is the load resistance; X ₂ is the load reactance (those skilled in the art can understand that the output impedance is the The impedance of the electrical connection between the module 230 and the upper electrode plate 240a, and the load impedance is the impedance of the object to be treated).

The thawing device 200 may further include a load compensation module 260 . The load compensation module 260 may include a compensation unit and a motor for adjusting the impedance of the compensation unit. The compensation unit can be set in series with the object to be processed, that is, the load impedance of the radio frequency generating module 230 at this time is the sum of the impedance of the object to be processed and the impedance of the compensation unit. The motor can be configured to increase or decrease the impedance of the compensation unit in a controlled manner, thereby increasing or decreasing the load impedance Z ₂ of the radio frequency generating module 230, and making the difference between the load impedance Z ₂ of the radio frequency generating module 230 and the output impedance Z ₁ The difference (that is, the value obtained by subtracting the output impedance Z1 from the load impedance Z2) is greater _than or equal to a _first impedance threshold and less than or equal to a second impedance threshold, and the first impedance threshold is less than the second impedance threshold, so as to improve the Thawing efficiency. In some preferred embodiments, the _first impedance threshold is -6~-4% of the output impedance Z1, and the second impedance threshold is ₄ ~6% of the output impedance Z1. Further preferably, the _first impedance threshold is -5% of the output impedance Z1, and the second impedance threshold is ₅ % of the output impedance Z1. In other words, the load compensation module can be configured so that the absolute value _of the difference between the load impedance Z2 of the radio frequency generating module ₂₃₀ and the output impedance Z1 is always less _than 5% of the output impedance Z1 during the whole thawing process, for example, it can be output ₁ %, 3% or 5% of impedance Z1.

The detection module 250 can be configured to further calculate the dielectric coefficient and the change rate of the dielectric coefficient of the object to be processed according to the load impedance Z ₂ of the radio frequency generation module 230 , so as to judge the thawing progress of the object to be processed. The formula for calculating the dielectric coefficient of the object to be treated is as follows:

X ₂ =1/2πfC (4)

ε＝4πKdC/S (5)

In formula (4), (5): f is the frequency of radio frequency wave; C is the capacitance of the capacitor that upper electrode plate 240a and lower electrode plate 240b form; ε is the dielectric coefficient of object to be treated; K is electrostatic constant; d is the thickness of the upper electrode plate; S is the area of the upper electrode plate.

The change rate of the permittivity of the object to be treated can be obtained by calculating the change value Δε of the permittivity ε within a unit time Δt, where the unit time Δt can be 0.1 second to 1 second, such as 0.1 second, 0.5 second or 1 second. Fig. 5 is the rate of change graph (the ordinate is the rate of change Δε/Δt of the dielectric coefficient of the object to be treated according to an embodiment of the present invention; the abscissa is the thawing time t of the object to be processed , the unit is min). Referring to FIG. 5, in some preferred embodiments, the radio frequency generating module 230 can be configured to reduce its working power by 30% to 40% when the change rate Δε/Δt 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 (those skilled in the art can understand that excessive thawing means that the temperature of the object to be processed is greater than 0° C.). The first rate threshold may be 15-20, such as 15, 17, 18 or 20. The radio frequency generating module 230 can also be configured to stop working when the change rate Δε/Δt of the dielectric coefficient of the object to be processed drops below or equal to the second rate threshold. The second rate threshold may be 1-2, such as 1, 1.5 or 2.

As the temperature of the object to be treated changes, the dielectric coefficient of the object to be processed will also change accordingly, which is known to those skilled in the art. However, the dielectric coefficient is usually measured by a special instrument (such as a dielectric coefficient tester). Moreover, the special instrument takes up a lot of space and costs high, so it is not suitable for refrigerators. The present invention calculates the dielectric coefficient of the object to be processed by detecting the incident wave signal and the reflected wave signal of the electrical connection connecting the radio frequency generating module 230 and the upper electrode plate 240a, which occupies a small space and is low in cost, and is especially suitable for refrigerators thawing device. And through the load compensation module 260, the difference between the load impedance and the output impedance of the radio frequency generation module 230 is within a preset range (greater than or equal to a first impedance threshold and less than or equal to a second impedance threshold), which improves the thawing of the object to be processed efficiency.

Further, the present invention judges the thawing progress of the object to be processed by calculating the change rate of the dielectric coefficient of the object to be processed by the detection module 250 . Before the present invention, those skilled in the art generally believed that when the temperature of the object to be treated was high (that is, the temperature of the object to be treated was greater than or equal to -7°C), the thermal effect would be significantly attenuated, so that the object to be treated would not be thawed excessively . However, the actual situation is not the case. Generally, the radio frequency thawing power is relatively high, such as greater than 100W. When the temperature of the object to be treated is already high, the object to be treated is easily thawed excessively. The inventors of the present application creatively realized that when the temperature of the object to be treated is already high, reducing the working power of the radio frequency generating module 230 by 30-40% can effectively prevent the object from being thawed excessively. Furthermore, the present invention judges whether the thawing is completed by the rate of change of the dielectric coefficient of the object to be treated. Compared with the prior art, which judges whether the thawing is completed by sensing the temperature of the object to be processed, the judgment is more accurate and can further prevent the The processed object has been thawed too much, and the test shows that the temperature of the processed object thawed by the thawing device of the present invention is generally -4~-2°C, which can avoid bloody water when the object is thawed when the object is meat.

FIG. 6 is a schematic structural diagram of the compressor chamber 140 in FIG. 2 . Referring to FIG. 6 , the cabinet 100 of the refrigerator 10 further defines a compressor room 140 . The compressor room 140 may include a main control board 143 for controlling the operation of the refrigerator 10 , a compressor 141 , a condensed water collection structure 144 and an external power cord (not shown) for powering the operation of the refrigerator 10 arranged in sequence. In some embodiments, the refrigerator 10 may further include a power supply module 142 for supplying power to the radio frequency generation module 230 . The power supply module 142 can be disposed in the compressor room 140 of the refrigerator 10 to facilitate heat dissipation and maintenance of the power supply module 142 . The power supply module 142 can be fixed on the upper wall of the compressor chamber 140 to facilitate the electrical connection between the radio frequency generating module 230 and the power supply module 142 . In some embodiments, the power supply module 142 may be a DCDC converter. The DCDC converter can be configured to be electrically connected to the main control board 143 to provide power for the thawing device 200 . The DCDC converter can be disposed between the main control board 143 and the compressor 141 to facilitate its electrical connection with the main control board 143 . In other embodiments, the power supply module 142 can be an ACDC converter. The ACDC converter can be configured to be electrically connected to the external power supply of the refrigerator 10 . Those skilled in the art can understand that it is easy to connect each component of the thawing device 200 with the control circuit of the refrigerator 10 .

FIG. 4 is a schematic cross-sectional view taken along line B-B in FIG. 3 . Referring to FIGS. 3 and 4 , the barrel 210 may further include a vertical partition 211 and a horizontal partition 212 for defining an inner space of the barrel 210 . The vertical partition 211 may be configured to extend from the top plate of the barrel 210 to the bottom plate of the barrel 210 in a vertical direction. The radio frequency generating module 230 can be disposed between the vertical partition 211 and the rear plate of the barrel 210 . The horizontal partition 212 can be configured to extend forward from the vertical partition 211 in a horizontal direction. The detection module 250 and the load compensation module 260 may be disposed between the horizontal partition 212 and the top plate of the barrel 210 . The thawing chamber 214 may be surrounded by a vertical partition 211 , a horizontal partition 212 , a bottom plate and two lateral side plates of the cylinder 210 . The upper electrode plate 240 a may be disposed on the lower surface of the horizontal separator 212 , and the lower electrode plate 240 b may be disposed on the upper surface of the bottom plate of the barrel 210 . The cylinder body 210 may also include a baffle plate 213 extending vertically upward from the front end of the horizontal partition 212 to the top plate of the cylinder body 210, so as to prevent the detection module 250 and the load compensation module 260 from being exposed and reduce the thawing device 200. aesthetics. In some other embodiments, the horizontal partition 212 can also be set forward from the rear plate of the cylinder 210 along the horizontal direction according to the actual situation (the size of the radio frequency generation module 230, the detection module 250 and the load compensation module 260). Extending, the vertical partition 211 is arranged to extend from the horizontal partition 212 to the bottom plate of the barrel 210 in the vertical direction.

The vertical partition 211 can be provided with a first cable opening 2112 , so that the radio frequency generating module 230 is electrically connected to the upper electrode plate 240a through the first cable opening 2112 . The rear panel of the cylinder body 210 may be provided with a second wire passage 216 , so that the electrical connection wire of the thawing device 200 is led out from the second wire passage 216 and connected to the power supply module 142 .

In some embodiments, the rear plate of the cylinder body 210 can be provided with a device air inlet 215, and the vertical partition 211 on the rear side of the thawing chamber 214 can be provided with a thawing air inlet 2111, so that the air in the freezing compartment 120 It enters into the thawing chamber 214 of the thawing device 200 through the device air inlet 215 and the thawing air inlet 2111 . Device air outlets 218 can be opened on the lateral side plates of the barrel 210 , so that the air in the thawing chamber 214 can be discharged to the freezing compartment 120 through the device air outlets 218 . There may be a gap between the rear plate of the cylinder body 210 and the rear wall of the freezing compartment 120 , so that the air in the freezing compartment 120 can enter into the thawing device 200 . There may be gaps between the lateral side plates of the cylindrical body 210 and the lateral side walls of the freezing compartment 120 , so that the gas in the thawing device 200 is discharged into the freezing compartment 120 . When the refrigerator 10 is a direct-cooling refrigerator, the rear wall of the freezer compartment 120 is the rear wall of the inner container; when the refrigerator 10 is an air-cooled refrigerator, the rear wall of the freezer compartment 120 is the front surface of the inner air duct cover plate .

In some preferred embodiments, the distance between the rear plate and the side plates on both lateral sides of the cylinder body 210 and the rear wall of the corresponding freezing compartment 120 and the side walls on both lateral sides may be 2-3 mm, such as 2 mm, 2.5 mm. Or 3mm, to ensure that the thawing chamber 214 has a larger effective volume while ensuring that the thawing device 200 has an appropriate air volume and air volume.

In some embodiments, the refrigerator 10 according to the present invention may be an air-cooled refrigerator, and the freezing compartment 120 may include an air duct cover plate 122 . The air duct cover plate 122 is interposed with the inner container rear wall of the freezer compartment 120 to form a freezer air duct, and the air duct cover plate 122 is provided with a freezer air inlet 1221 and a freezer return air outlet for providing cooling capacity for the freezer compartment 120 . The freezing air inlet 1221 and the freezing return air outlet can be arranged in the left compartment and the right compartment of the freezing compartment 120 respectively, so as to avoid food odor in the freezing compartment 120 . In some preferred embodiments, the left and right compartments of the freezing compartment 120 can respectively define a plurality of accommodating spaces, and in the present invention, the plurality is two, three or more than three, etc. It is arranged in the accommodation space adjacent to the freezing air inlet 1221 . Referring to Fig. 2, the freezing air inlet 1221 is arranged in the left compartment of the freezing compartment 120, and since the freezing air inlet 1221 is usually arranged in the uppermost storage space of the freezing compartment 120, the thawing device 200 is preferably installed in the freezing room In the uppermost accommodation space of the left compartment of the chamber 120 , the freezing air duct cools the thawing chamber 214 of the thawing device 200 . In some further preferred embodiments, the projection of the device air inlet 215 of the thawing device 200 in the thickness direction of the air duct cover plate 122 can be located in the freezing air inlet 1221, so as to refrigerate the thawing chamber 214 of the thawing device 200 .

In the present invention, by setting the device air inlet 215 and the device air outlet 218 on the thawing device 200, when the thawing instruction is not received, the thawing chamber 214 can be used to place food materials, so that the storage space in the freezing compartment 120 can be fully utilized. use.

In some preferred embodiments, the device air inlet 215 and the defrosting air inlet 2111 of the thawing device 200 can be respectively arranged on lateral sides of the radio frequency generating module 230 to facilitate heat dissipation of the radio frequency generating module 230 . In some alternative embodiments, the device air inlet 215 and the defrosting air inlet 2111 of the thawing device 200 may be disposed on the same side of the radio frequency generating module 230 .

The thawing device 200 may further include a tray 270 . The tray 270 is disposed in the thawing chamber 214 , and the objects to be processed are placed on the tray 270 . The tray 270 may be configured to controllably move in the depth direction of the thawing chamber 214, so as to facilitate the placement and removal of objects to be treated. In some preferred embodiments, the distance between the lower surface of the tray 270 and the lower electrode plate 240b may be 8-12mm, such as 8mm, 10mm, 12mm, to prevent friction with the lower electrode plate 240b when the tray 270 is drawn. .

In some embodiments, any refrigerated door body 111 may be provided with a thawing switch 112 for controlling the start or stop of the thawing program, so that the user can adjust the thawing switch 112 . The radio frequency generating module 230 can be configured to start working when the unfreezing switch 112 is turned on, and stop working when the unfreezing switch 112 is turned off. During the defrosting process, the user can terminate the defrosting process by turning off the defrosting switch 112 . A buzzer (not shown in the figure) can also be arranged on the door body of any compartment to prompt the user that the object to be treated has been thawed. The buzzer can be configured to start working when the detection module 250 judges that the thawing of the object to be processed is completed (when the rate of change of the dielectric coefficient of the object to be processed drops to less than or equal to the second rate threshold); When taken out in 214, stop working.

The thawing device 200 may further include an infrared sensor 219 . The infrared sensor 219 is disposed on the inner wall of the thawing chamber 214 to sense whether there is an object to be processed in the thawing chamber 214 . In some preferred embodiments, the refrigerating system of the refrigerator 10 can be configured to stop providing cold energy for the freezing compartment 120 when the thawing switch 112 is turned on, so as to avoid affecting the thawing device 200 to thaw the object to be processed; After completion, when taking out from the thawing chamber 214 within a predetermined time threshold, run the original refrigeration program of the refrigerator 10; , to provide cooling capacity for the freezing compartment 120 . That is, when the time during which the object to be treated has not been taken out from the thawing chamber 214 is less than the predetermined time threshold, the temperature in the thawing chamber 214 remains unchanged, so that the object to be processed is always in a thawed state during this period of time, so that the user can Use the object to be treated; when the time for the object to be processed is not taken out from the thawing chamber 214 is greater than or equal to the preset time threshold, the refrigeration system provides cooling capacity for the freezing compartment 120, and the object to be processed is re-frozen to ensure the safety of the object to be processed quality. In the present invention, the timer in the refrigerator 10 can be used to record the time when the object to be treated is not taken out of the thawing chamber 214 after thawing is completed. The predetermined time threshold may be 15-25 minutes, such as 15 minutes, 20 minutes or 25 minutes.

Fig. 7 is a schematic structural diagram of the thawing device in Fig. 3, wherein the device door of the thawing device is removed to show the internal structure of the cylinder. Referring to FIGS. 1 and 7 , the cylinder body 210 and the device door body 220 may be respectively provided with electromagnetic shielding features 217 . The electromagnetic shielding feature 217 provided on the cylinder body 210 and the electromagnetic shielding feature 217 provided on the device door 220 can be electrically connected to reduce the magnetic leakage of the thawing device 200 when the device door 220 is closed. The electromagnetic shielding feature 217 can be a conductive coating coated on the inner wall of the cylinder 210 and the inner surface of the device door 220 (the surface facing the cylinder 210 ), and can be attached to the inner wall of the cylinder 210 and the inner surface of the device door 220 . The conductive metal mesh on the surface or the conductive metal mesh formed in the plates surrounding the cylinder 210 and in the door 220 of the device, etc.

In some preferred embodiments, the thawing device 200 may further include an elastic conductive ring 280 . The elastic conductive ring 280 can be arranged at the periphery of the forward opening of the thawing chamber 214, so that it can be squeezed and deformed when the device door 220 is closed, and fit closely with the device door 220, that is, the elastic conductive ring 280 Form a seal with the device door 220 . The electromagnetic shielding feature 217 provided on the cylinder body 210 and the electromagnetic shielding feature 217 provided on the device door 220 can be respectively set to be in conductive contact with the elastic conductive ring 280, so as to reduce the outward movement of the thawing device 200 when the device door 220 is closed. magnetic leakage. In some preferred embodiments, the elastic conductive ring 280 can be made of silicone, silicone fluoride, EPDM, fluorocarbon-silicon fluoride, and silver-plated aluminum. The elastic conductive ring 280 can be a hollow ring structure, so that it can be closely attached to the device door 220 when the device door 220 is closed. The width of the elastic conductive ring 280 may be 20-30 mm, such as 20 mm, 25 mm or 30 mm, so as to improve the airtightness of the thawing device 200 . In some preferred embodiments, the device air inlet 215, the thawing air inlet 2111 and the device air outlet 218 of the thawing device 200 can all be provided with a conductive metal mesh 290, and the conductive metal mesh 290 can be set to be electromagnetically shielded with the cylinder body 210. Feature 217 is electrically connected to reduce the amount of magnetic leakage from thawing device 200 .

In particular, in the present invention, the radio frequency signal generated by the radio frequency generation module 230 (that is, the electromagnetic wave used to thaw the object to be processed) can be a preset fixed frequency within the range of 40-42MHz, such as 40MHz, 40.48MHz, 40.68MHz, 41MHz or 42MHz, to reduce the thawing time of the object to be treated, improve the temperature uniformity of the object to be treated and reduce its juice loss rate. In a preferred embodiment, the frequency of the radio frequency wave can be a preset fixed frequency within the range of 40.48-40.68MHz, 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 its juice loss rate . Among them, when the frequency of the radio frequency wave is 40.68MHz, the unfreezing effect is the best.

In order to further understand the present invention, preferred embodiments of the present invention will be described below in conjunction with 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 devices 200 provided with the RF frequencies of the above-mentioned embodiments 1-5 and comparative examples 1-2 respectively, the power of the radio frequency wave is 100W, and the structure and working process of the thawing devices 200 are the same.

The thawing effect test was performed on the thawing device 200 provided with the frequency of each embodiment and each comparative example. Test description: Select 1 kg of beef with the same shape and specification and an initial temperature of -18°C, place it on the tray 270 in the thawing device 200 of each embodiment and each comparative example, and measure the thawing of each embodiment and each comparative example respectively. Time, temperature uniformity and juice loss rate, wherein the thawing time is from the beginning of thawing to the time when the thawing device 200 judges that the thawing is completed (that is, the radio frequency generation module 230 stops working); temperature uniformity: after the thawing is completed, measure four beefs respectively. The temperature of the corner and the center point, and calculate the difference between the center point temperature and the average value of the four corners, and the temperature uniformity is the ratio of the difference to the average value; juice loss rate: measure the weight of the beef before thawing and the weight after thawing, and calculate the difference between the two, and the juice loss rate is the ratio of the difference to the weight of the beef before thawing.

Table 2 shows the thawing effect test results according to Examples 1-7 and Comparative Examples 1-2.

Table 2

Thawing time (min) temperature uniformity Juice loss rate (%) 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

According to the test results of Example 5 and Comparative Example 1 in Table 2, it can be seen that the power of the radio frequency wave is the same, and the structure of the thawing device 200 and its work flow are all the same, under the same test conditions, the application of the present invention The thawing effect of the radio frequency thawing device 200 within the scope of the embodiment is better than that of the radio frequency thawing device 200 in the prior art. Compared with the latter, the thawing time of the former is reduced by 20%, and the temperature uniformity is increased by 17%.

According to the test results of Examples 1-5 in Table 2, it can be seen that the thawing time of the thawing device 200 using each embodiment of the present invention is all below 20 minutes, the temperature uniformity is all below 0.5, and the juice loss rate is all below 0.40%. . By further optimizing the frequency of the radio frequency (for example, the radio frequency is 40.48-40.68 MHz), the thawing time of the thawing device 200 can be reduced to less than 18 minutes, the temperature uniformity can be increased to less than 0.4, and the juice loss rate can be reduced to less than 0.32%.

FIG. 8 is a flowchart of a defrosting method for the refrigerator 10 according to one embodiment of the present invention. Referring to Fig. 8, the thawing method of the refrigerator 10 of the present invention may include the following steps:

Step S802: Determine whether the unfreezing switch 112 is turned on, if yes, execute step S804; if not, execute step S802.

Step S804: the power supply module 142 starts to work.

Step S806: Determine whether the device door 220 is closed, if yes, execute step S808; if not, execute step S806. In this step, the opening and closing state of the door body 220 of the device can be detected by using the door opening detection device. The door opening detection device can use various methods such as fan switch, magnetic sensitive switch, and Hall switch to detect, and generates different electrical signals when the device door 220 is completely closed or opened to indicate the state of the device door 220 .

Step S808: the refrigeration system stops providing cooling capacity for the freezer compartment 120, the radio frequency generating module 230 generates a radio frequency signal of 40-42 MHz, and the detection module 250 detects the incident wave signal and the reflected wave signal. Execute step S810 and step S811. In this step, the radio frequency generating module 230 generates a radio frequency signal of 40.68 MHz.

Step S810: Obtain the voltage and current of the incident wave signal and the voltage and current of the reflected wave signal, and calculate the change rate Δε/Δt of the dielectric coefficient of the object to be treated.

Step S812: Determine whether the change rate Δε/Δt of the dielectric coefficient of the object to be processed is greater than or equal to the first rate threshold, if yes, perform step S814; if not, perform step S810.

Step S814: The working power of the radio frequency generating module 230 is reduced by 30%-40%. In this step, the working power of the radio frequency generating module 230 can be reduced by 35%.

Step S816: Obtain the voltage and current of the incident wave signal and the voltage and current of the reflected wave signal, and calculate the change rate Δε/Δt of the dielectric coefficient of the object to be treated.

Step S818: Determine whether the change rate Δε/Δt of the dielectric coefficient of the object to be processed is less than or equal to the second rate threshold, if yes, perform step S820; if not, perform step S816.

Step S820: the power supply module 142 stops working, the defrosting switch 112 is reset (that is, turned off), the original cooling program of the refrigerator 10 is run, and the buzzer starts to work.

Step S822: The timer starts timing.

Step S824: Determine whether the object to be treated is taken out from the thawing chamber 214, if yes, execute step S826; if not, execute step S828.

Step S826: The buzzer stops working, and the original refrigeration program of the refrigerator 10 is run.

Step S828: Determine whether the value of the timer is greater than or equal to a predetermined time threshold, if yes, execute step S830; if not, execute step S824.

Step S830: The timer is reset, the buzzer stops working, and the refrigeration system of the refrigerator 10 provides cooling capacity for the freezer compartment 120 .

Step S811: Obtain the voltage and current of the incident wave signal and the voltage and current of the reflected wave signal, and calculate the load impedance Z ₂ of the radio frequency generation module 230 .

Step S813: Determine whether the difference between the load impedance Z2 and the output impedance Z1 _of the radio frequency generating module ₂₃₀ is smaller than the first impedance threshold, if yes, execute step S815; if not, execute step S817.

Step S815: The motor of the load compensation module 260 works to increase the impedance of the compensation unit. Return to step S811.

Step S817: Determine whether the difference between the load impedance Z2 and the output impedance Z1 _of the radio frequency generating module 230 is greater than the _second impedance threshold, if yes, execute step S819; if not, execute step S811.

Step S819: the motor of the load compensation module 260 works to reduce the impedance of the compensation unit. Return to step S811.

Those skilled in the art can understand that when the program runs to step S820, the power supply module 142 stops working, that is, the power supply is stopped, and the radio frequency generation module 230, the detection module 250 and the load compensation module 260 all stop working, that is, when the medium of the object to be processed When the rate of change Δε/Δt of the electrical coefficient drops to less than or equal to the second rate threshold, the detection module 250 stops detecting the incident wave signal and the reflected wave signal of the electrical connection connecting the radio frequency generation module 230 and the upper electrode plate 240a, and the load compensation module 260 stop working.

A thawing workflow of the refrigerator 10 in an embodiment of the present invention may include: when the user turns on the thawing switch 112 and the device door 220 is closed, the power supply module 142 starts to supply power, and the refrigeration system of the refrigerator 10 stops providing cooling capacity for the freezer compartment 120 , the radio frequency generation module 230 generates a radio frequency signal of 40.68MHz, and the detection module 250 and the load compensation module 260 start to work. The detection module 250 detects the incident wave signal and the reflected wave signal of the electrical connection connecting the radio frequency generation module 230 and the upper electrode plate 240a, and calculates the load impedance Z2 of the radio frequency transmitter ₂₃₀ and the change rate of the dielectric coefficient Δε/Δt. When the rate of change Δε/Δt of the dielectric coefficient of the object to be treated is greater than or equal to the first rate threshold, the current operating power of the radio frequency generation module 230 is reduced by 35%. When the difference between the impedance Z ₂ and the output impedance Z ₁ is less than the first impedance threshold or greater than the second impedance threshold, the load compensation module 260 adjusts the impedance of the compensation unit through the motor, and then adjusts the load impedance Z ₂ of the radio frequency generation module 230, so that The difference between the load impedance Z ₂ and the output impedance Z ₁ of the radio frequency generating module 230 is always greater than or equal to the first impedance threshold and less than or equal to the second impedance threshold. When the change rate Δε/Δt of the dielectric coefficient of the object to be processed is less than or equal to the second rate threshold, the power supply module 142 stops supplying power, the radio frequency generation module 230, the detection module 250 and the load compensation module 260 stop working, and the buzzer starts working. The timer starts counting. If the time for which the object to be processed is not taken out is less than the preset time threshold, the temperature in the thawing chamber 214 remains unchanged until the user takes out the object to be processed from the thawing chamber 214, the buzzer stops working, and the original refrigerator 10 is operated. Refrigeration program: if the time for which the object to be treated is not taken out is greater than or equal to the preset time threshold, the timer is reset, the buzzer stops working, and the refrigeration system of the refrigerator 10 provides cooling capacity for the freezer compartment 120 .

So far, those skilled in the art should appreciate that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, the disclosed embodiments of the present invention can still be used. Many other variations or modifications consistent with the principles of the invention are directly identified or derived from the content. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. A refrigerator, comprising a box body and a thawing device defining a refrigerated compartment and a refrigerated compartment distributed successively along the vertical direction of the refrigerator, a vertical beam is respectively arranged in the refrigerated compartment and the refrigerated compartment, To separate the refrigerated compartment and the frozen compartment into two left and right compartments; wherein the thawing device includes: The cylinder body defines a thawing chamber with a forward opening, and the thawing chamber is used to place the object to be treated; The door body of the device is arranged at the forward opening of the thawing chamber, and is used to open and close the thawing chamber; a radio frequency generation module configured to generate a radio frequency signal; and The upper electrode plate and the lower electrode plate are horizontally arranged on the top wall and the bottom wall of the thawing chamber, respectively, and are respectively electrically connected to the radio frequency generating module, so as to generate in the thawing chamber according to the radio frequency signal radio frequency waves of a corresponding frequency, and thaw the to-be-processed object in the thawing chamber; and The thawing device is arranged in the freezing compartment. 2. The refrigerator according to claim 1, wherein The rear plate of the cylinder is provided with a device air inlet, and there is a gap between the rear plate of the cylinder and the rear wall of the freezing compartment, so that the air in the freezing compartment enters through the device air inlet to the thawing chamber; and The side plates on both lateral sides of the cylinder are provided with device air outlets, and there are gaps between the side plates on both lateral sides of the cylinder and the side walls on both lateral sides of the freezing compartment, so that the The gas in the thawing chamber is discharged to the freezing compartment through the air outlet of the device. 3. The refrigerator according to claim 2, wherein The distance between the rear wall and side plates on both lateral sides of the cylinder and the rear wall and side walls on both lateral sides of the corresponding freezing compartment is 2-3 mm. 4. The refrigerator according to claim 2, wherein The refrigerator is an air-cooled refrigerator; The refrigerated compartment includes an air duct cover plate, which is interposed with the inner tank rear wall of the refrigerated compartment to form a refrigerated air duct, and the air duct cover plate is provided with a refrigerated air inlet for said freezer compartment provides cooling; and The left and right compartments of the freezing compartment respectively define a plurality of accommodation spaces, and the freezing air inlet is arranged in the uppermost accommodation space of the left compartment of the freezing compartment; The thawing device is arranged in the uppermost accommodating space, so that the freezing air duct provides cooling capacity for the thawing device. 5. The refrigerator according to claim 4, wherein The projection of the device air inlet in the thickness direction of the air duct cover plate is inside the freezing air inlet, so that the freezing air duct can provide cooling capacity for the thawing device. 6. The refrigerator according to claim 1, further comprising a refrigerating door body and a freezing door body for respectively opening and closing the left and right compartments of the refrigerating compartment and the freezing compartment, wherein Any of the refrigerated doors is provided with a thawing switch for controlling the start or stop of the thawing program, so as to adjust the thawing switch; and the radio frequency generating module is configured as: When the thawing switch is turned on, start working; When the thawing switch was turned off, it stopped working. 7. The refrigerator according to claim 6, wherein the thawing device further comprises: An infrared sensor is arranged on the inner wall of the thawing chamber to sense whether the object to be treated is placed in the thawing chamber. 8. The refrigerator according to claim 7, wherein the refrigerator is configured as: When the defrosting switch is turned on, stop providing cold energy to the freezing compartment; When the object to be treated is taken out from the thawing chamber, the original refrigeration program of the refrigerator is run; When the object to be treated has not been removed from the thawing chamber for a time greater than or equal to a predetermined time threshold after the thawing is completed, cooling capacity is provided for the freezing compartment. 9. The refrigerator according to claim 1, further comprising: The detection module is configured to detect the incident wave signal and the reflected wave signal of the electrical connection connecting the radio frequency generation module and the upper electrode plate, and according to the voltage and current of the incident wave signal and the reflected wave signal The voltage and current are used to calculate the change rate of the dielectric coefficient of the object to be treated, so as to judge the thawing progress of the object to be treated. 10. The refrigerator according to claim 9, wherein the radio frequency generating module is configured as: When the change rate of the dielectric coefficient of the object to be treated is greater than or equal to the first rate threshold, its working power is reduced by 30% to 40%, so as to prevent the object to be treated from being excessively thawed; and/or When the change rate of the dielectric coefficient of the object to be processed drops to less than or equal to the second rate threshold, stop working.