JPS603821B2 - Defrosting method using high frequency defrosting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for defrosting frozen products using a high-frequency defrosting device, and an object of the present invention is to prevent fogging using a method that is simple in terms of cost.

Conventionally, defrosting using dielectric heating using a high frequency electric field of several MHz or more is generally known, and in order to uniformly defrost and prevent local heating, a high frequency electric field is applied while cooling the surface in a cold atmosphere. Methods are also known.

FIG. 1a is a schematic diagram of such a conventional high frequency decompression device. In FIG. 1a, the thawing chamber 1, the cooling device 2, the cold air passages 3, 3', and the outside thereof are covered with a heat insulating material 4, and the upper electrode 5 (
The object to be thawed 7 is sandwiched between the ground side) and the lower electrode 6,
Defrosting is performed by dielectric heating by applying a high-frequency electric field, 8 is a high-frequency oscillation section, and 9 is a high-voltage power supply section. In addition, 10 is an oscillation tube (vacuum tube) in the oscillation section, and blower fan 1
1 for cooling. When actually operating this high-frequency thawing apparatus, as shown in FIG. 1b, the refrigeration apparatus is first operated, and after a period of time A until the inside of the thawing chamber is cooled, the oscillator is operated, and thawing operation c is started. At that time, for safety reasons, the vacuum tube cooling fan is set to operate several seconds earlier than the oscillation. Therefore, in order to first cool the inside of the thawing chamber in the freezing device, the weight body 1' that constitutes the thawing chamber is cooled, and the cooling is transmitted to the weight bodies 12, 13, and 14 that shield the high frequency oscillator connected to it, which is close to the thawing chamber. There was a problem in that dew condensation formed on one surface and the insulation deteriorated. This can be done by thermally cutting off the pupil body 1' through the parts 12, 13, and 14, but in this case, the coating body 1 that shields the thawing chamber body 1'
2, 13, and 14, resulting in the problem of high-frequency radio waves leaking to the outside. In some conventional devices, the high-frequency oscillator is located at the rear of the thawing chamber to reduce thermal coupling, but this increases the size of the thawing device as a whole and creates a dead space at the bottom of the thawing chamber. The present invention provides a defrosting method for a high-frequency defrosting device that is free from the fear of insulation deterioration due to radio wave leakage and fog condensation, and one embodiment thereof will be described with reference to the accompanying drawings.

In FIG. 2, reference numeral 15 denotes a thawing chamber for storing an object 16 to be thawed, and is surrounded by a weight body 17.

18 is a counterfeit board made of resin with a low yield rate.

The thawing chamber 15 and the freezing device 19 are connected to each other by wind cylinders 20 and 21, and their outer peripheries are all covered with a heat insulating material 22. A lower electrode 23 configured with a predetermined gap is provided below the object 16 to be thawed, and a movable electrode 24 is provided above the object 16 to be thawed, and the object 16 to be thawed is sandwiched therebetween with an insulator 25 interposed therebetween. The lower electrode 23 is provided in an electrode box 26, and shield boxes 28 and 29 containing a high-frequency oscillator 27 are provided below the electrode box 26 so as to be electrically free from gaps. Further, the high frequency oscillator includes an oscillation tube 30 and a blower fan 31 for cooling the oscillation tube 30. Further, 32 is a high-voltage power supply section, and 33 is an exhaust hole provided at the upper side wall of the shield box 28. Next, the operation of the high frequency decompressor of the present invention will be explained.

As shown in FIG. 2b, first, the refrigeration system is operated (the blower fan 31 is operated at the same time), the inside of the thawing chamber 15 is made into a cold atmosphere (time A), and the object 16 to be thawed is placed between the upper and lower electrodes 24. ，
23, the high-voltage power supply 32 is turned on, the high-frequency oscillator 27 is activated, a high-frequency electric field is applied between the electrodes 23 and 24, and the object to be thawed is thawed by dielectric heating (time C). ). At this time, by operating the blower fan 31 at the same time as the refrigeration device 19, the wind that cools the oscillation tube 30 and becomes warm air flows in the direction of arrow A and cools the shield boxes 28, 29 and the Kamepoku box 26. This prevents fogging by preventing fogging. With this means of using air, it is possible to prevent fogging without insulating the connection between the enclosure 17 and the shield boxes 28 and 29 that make up the thawing chamber, so the metals are bonded together so that no gaps are formed. There is no need to worry about radio waves leaking outside.
Furthermore, since the high-frequency oscillator 27 is located below the thawing chamber 15, there are effects such as making the entire thawing device more compact. In addition, as shown in FIG.
5, hot air can be effectively applied to areas such as the electrode box 10 that are close to the thawing chamber and have a strong cooling capacity, making it possible to prevent dew condensation more effectively. As described above, the device of the present invention has almost no effect in terms of cost and can very easily prevent mist feeding.

[Brief explanation of the drawing]

FIG. 1a is a sectional view of a secondary high-frequency thawing device, FIG. 1b is a diagram showing the operating sequence of the same, FIG. 2a is a sectional view of a high-frequency thawing device in an embodiment of the present invention, FIG. b is a diagram showing the same operation, and FIG. 3 is a partial sectional view showing another embodiment. 15... Thawing chamber, 19... Refrigeration device, 23...
...Lower electrode, 24...Moving electrode, 27...
... High frequency oscillator, 30 ... Oscillation tube, 31
...Blower fan, 32 ...High voltage power supply section, 3
3-35... Camphor stomata. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1: a thawing chamber that stores an object to be thawed; a pair of electrodes that thaws the object; a high-frequency oscillator that applies a high-frequency electric field to the electrode; a refrigeration device that maintains a cold atmosphere inside the thaw chamber; and a blower fan that cools an oscillation tube included in the oscillation device, the blower fan operating simultaneously with the refrigeration device and generating high-frequency oscillations electrically and thermally coupled to a casing constituting the thawing chamber. A thawing method for a high-frequency thawing device that cools an oscillation tube and supplies warm air to the casing that shields the device.