JPS5950305B2 - High frequency thawing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-frequency thawing device for frozen products, etc., and is aimed at making the device more compact and improving heating efficiency.

Conventional dielectric heating generally performs defrosting work using a high frequency of several MH2 or more.

FIGS. 1 and 2 show a thawing device that uses dielectric heating to thaw an object using a relatively low high frequency such as 13MH2, which has two electrodes, upper and lower, configured to sandwich the object to be thawed. In the figure, a high-voltage side electrode 2 is provided above the object 1 to be thawed with an appropriate gap, and a ground-side electrode 3 is provided at the bottom of the object 1 to be thawed. The object 1 to be thawed is heated and thawed due to the dielectric loss of the object 1. 4 and 5 are high voltage side electrode 2, earth side electrode 3
It is an insulating cover configured to cover the

Reference numeral 6 denotes a high-voltage power supply unit, and □ indicates a high-frequency oscillator unit that supplies high-frequency energy to the object to be thawed. The unit is shielded to prevent radio waves from leaking to the outside, and is connected to the high-voltage power supply 6 by a power supply line 8.

Reference numerals 9 and 10 indicate power supply lines that respectively feed power to the high voltage side electrode 2 and the earth side electrode 3. The high voltage side power supply line 9 is covered with a shield wall 11 to prevent radio waves from leaking to the outside.

In FIG. 1, the high frequency oscillator section T is arranged at the rear or side of the thawing chamber, and in FIG. 2, it is arranged at the lower part of the thawing chamber.

The problem with the configuration shown in Figure 1 is the rear part of the thawing chamber.
Also, since the high frequency oscillator T is provided on the side, the depth or width of the thawing device body becomes large, which has the disadvantage of making it large.

In the configuration shown in FIG. 2, since the high-frequency oscillator section T is provided at the bottom of the thawing chamber, it protrudes toward the side or rear of the thawing chamber by the size of the shield wall 11. It is relatively small compared to .

In commercial thawing equipment, the position of the opening J for loading the object 1 to be thawed is set at approximately 70 to 90 ClrL from the floor for workability reasons. It is possible to provide it at the bottom of the chamber.
However, the feeder line 9 that supplies high-frequency energy becomes very long, and the inductance or stray inductance of the feeder line 9 up to the high-voltage j side electrode 2 is large, resulting in loss in the feeder line itself and damage to the material around the feeder line 9. The efficiency was poor due to dielectric heating. Also, due to the variation in the inductance, the frequency and high frequency oscillator section? In order to ensure stability, it was necessary to adjust each unit one by one after assembly, which sometimes resulted in a lack of productivity. In addition, in the conventional example,
Adjustment of the gap between the object 1 to be thawed and the high-voltage side electrode 2, which is the upper electrode, was done by intuition or by relying on a scale. If the gaps are made too close together than necessary, electrical discharge may occur, and conversely, if they are made too far apart, the object to be thawed 1
The voltage applied to the container decreased, and even after setting the predetermined time, it was not thawed, and it was necessary to perform the thawing operation again. As described above, conventional defrosting devices have poor space efficiency, productivity, and work efficiency. The present invention provides a high-frequency decompressing device that eliminates the conventional drawbacks, and one embodiment of the present invention will be described below with reference to the drawings. Figures 3 and 4
In the figure, a lower electrode configured with a predetermined gap provided at the bottom of the object 1 to be thawed is a high voltage side electrode 3, and an earth side electrode 2 is formed above the object 1 to be thawed. The side electrode 2 is used in contact with or in close proximity to the object to be thawed.

The high-voltage side electrode 3 is insulated from the mounting plate 5 for the object 1 to be thawed or the wall surface of the thawing chamber 12 made of a grounded conductive material, and has a predetermined gap to ensure an optimal thawing state. ing. Since the high frequency oscillator section T is provided below the high voltage side electrode 3, the high voltage side power supply line 9 may be very short. Reference numeral 13 denotes a cooling air cylinder, which is equipped with an evaporator 14 and a blower 15 inside, and guides cold air into the thawing chamber 12 to cool the object 1 to be thawed.
It is now possible to thaw while cooling.

A condenser unit comprising a condenser 16, a compressor 17, a blower, etc., constituting an external unit of the refrigerator is provided outside the cooling wind cylinder 13. Reference numeral 18 designates an electrode lifting device for bringing the ground side electrode 2 into contact with or in close proximity to the object 1 to be thawed, 19 a motor serving as a driving source for lifting and lowering, and 20 an outer casing of the thawing device.

The decompression operation in this embodiment will be explained. When the object 1 to be thawed is stored in the thawing chamber 12 and the ground side electrode 2 is brought into contact with or close to the upper end surface of the object 1 to be thawed, and the high-voltage power supply and high-frequency oscillator are operated, the dielectric loss of the object 1 to be thawed increases. The food is heated and thawing begins. At this time, if cold air is blown into the thawing chamber 12 to cool the object 1 to be thawed, local abnormal overheating can be suppressed and uniform thawing can be performed. In the present invention, the high-voltage side electrode 3 is configured below the object to be thawed 1, and the high-frequency oscillator section 7 is further provided below the high-voltage side electrode 3.
The power supply line 9 can be very short, the inductance of the power supply line 9 itself or stray inductance is small, the power supply loss is small, efficiency is improved, inductance variation is small, and adjustment after assembly is not required, increasing productivity. can be improved.

Further, since the shield wall 11 of the power supply line 9 is not formed on the side or rear part of the thawing chamber 12, the space inside the thawing device can be effectively used, and the thawing device can be made more compact. Further, a high voltage side electrode 3 is provided with a predetermined gap below the object 1 to be thawed, and a ground side electrode 2 is provided.
Since the ground electrode 2 is thawed in contact with or in close proximity to the object 2 to be thawed, there is no need for the operator to adjust the ground-side electrode 2 by intuition or scale, since a predetermined gap is already provided, and the discharge, Unzipped files can be resolved and thawed efficiently. As described above, the present invention has effects such as compactness, improvement in thawing efficiency, improvement in productivity, and improvement in efficiency of thawing work.

[Brief explanation of drawings]

FIGS. 1 and 2 are schematic sectional views of main parts of a conventional high-frequency thawing device, FIG. 3 is a sectional view of a high-frequency thawing device according to an embodiment of the present invention, and FIG. 4 is a circuit diagram of the same device. . DESCRIPTION OF SYMBOLS 1... Object to be thawed, 2... Earth side electrode, 3... High voltage side electrode, 5... Mounting plate, T... High frequency oscillation part, 9
... Power supply line, 12... Thawing chamber.

Claims (1)

[Claims] 1 A thawing chamber that stores an object to be thawed, a high-frequency oscillator that supplies high-frequency energy to the object to be thawed, and a pair of electrodes are provided, and a high voltage is applied between these electrodes to thaw the object. A high-frequency thawing device in which a lower electrode provided with a predetermined gap between the two electrodes is connected to the high-voltage side, an upper electrode of the object to be thawed is connected to the ground side, and a high-frequency oscillator section is provided below the lower electrode on the high-voltage side. .