JPS5940432B2 - High frequency thawing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thawing device for frozen products, etc., and is aimed at improving electrical insulation and thermal insulation.

Ru. Conventional dielectric heating is generally thawed at a high frequency of several MH2 or higher.

For example, dielectric heating thawing is performed by configuring two upper and lower electrodes that sandwich the object to be thawed using a relatively low frequency such as 13MH2. A thawing device for freezing is shown in FIG. This is constructed by providing an upper electrode 2 on the high voltage side with an appropriate gap above the object 1 to be thawed, and a lower electrode 3 on the earth side below the object 1 to be thawed, and creating a high-frequency wave between the two electrodes 2 and 3. By applying a high voltage, the object 1 to be thawed is heated and thawed due to dielectric loss. 4 and 5 are insulating covers configured to cover the upper electrode 2 on the high voltage side and the lower electrode 3 on the earth side.

Reference numeral 6 denotes a high-voltage power supply unit -T, which is a high-frequency oscillator unit that supplies high-frequency energy to the object to be thawed, is shielded so that radio waves do not leak to the outside, and is connected to the high-voltage power supply unit 6 by a power supply line 8.

Reference numerals 9 and 10 are power supply lines that feed power to the upper electrode 2 and the lower electrode 3, respectively.

Reference numeral 11 is a heat insulating material that maintains a cool atmosphere inside the thawing chamber by an appropriate method.

The problem with this configuration is that, since the high-frequency oscillation tW)T is provided at the rear or side of the thawing chamber, the thawing device body has a large depth or width, making it large.
Further, the upper part of the upper electrode 2 was exposed in the thawing chamber, and there was a risk of touching the upper electrode 2 on the high voltage side during the thawing operation if a safety circuit such as a door switch (not shown) were to fail. In order to solve the above drawbacks, a configuration can be considered in which the high frequency oscillator section 7 is provided in the lower part of the thawing chamber, the lower electrode is used as the high voltage side electrode, and the upper electrode is used as the earth side electrode.

Note that the position of the inlet for the thawing object 1 is configured to be approximately 70 to 90 cln from the floor surface than the work surface, so there is a space below the thawing chamber, and the high-frequency oscillator section T should be provided at the bottom of the thawing chamber. is possible. Therefore, the present invention provides a high-frequency thawing device that has a new electrode configuration in which the electrode configuration of the high-frequency thawing device is reversed, and improves electrical insulation and thermal insulation for maintaining a cold atmosphere.

An embodiment of the present invention will be explained based on Fig. 2)
.

In FIG. 2, the same reference numerals as in FIG. 1 indicate the same parts. A lower electrode 3 configured with a predetermined gap provided below the object 1 to be thawed is used as a high voltage side electrode, and the lower electrode 3 is housed in a shielding chamber 12VC made of a conductive material such as aluminum. An upper electrode 2 connected to the ground side is formed on the soil part of the object 1 to be thawed, and during operation, the upper electrode 2 is used by being in contact with or close to the object 1 through the insulating cover 4. . The object to be thawed 1 is placed on the placing plate 5 . 13,13'
is a cooling wind cylinder, which is equipped with a refrigerator 14 inside and has a thawing chamber 1.
Cold air is introduced into the thawing chamber 15 to maintain a cold atmosphere in the thawing chamber 15, and the object 1 to be thawed is thawed while being cooled.

Reference numeral 16 designates an electrode lifting device that brings the upper electrode 2 into contact with or brings it close to the object 1 to be thawed, and 17 represents a motor that is a driving source for raising and lowering the electrode.

Reference numeral 18 denotes a partition plate, which is a sheet-like material made of a plastic material with low dielectric loss and low thermal conductivity, such as polypropylene or diuracon. A room maintained in a cool atmosphere such as a lower passage 19 formed by a placing plate 5 and a partition plate 18;
It is configured to be separated from the shielding chamber 12.

That is, the end surface of the partition plate 18 protrudes from the shielding chamber 12, and since the partition plate 18 is interposed between the plate constituting the room maintained in a cold atmosphere and the plate constituting the shielding chamber 12, heat is not generated. Insulated. Reference numeral 20 denotes a partition plate that separates the shielding chamber 12 from the high frequency oscillator section 7 disposed below the shielding chamber 12, and is fixed to the main body (not shown) by a suitable method.

Air in the high-frequency oscillator section 7 is prevented from flowing into the shielding chamber 12, and heat generated from vacuum tubes, resistors, etc. (not shown) in the high-frequency oscillator section 7 is not flowing into the shielding chamber 12, and the high-frequency oscillator It is discharged to the outside of section 7. The operation of the above device during decompression will be explained.

First, the refrigerator 14 is operated to maintain the thawing chamber 15 in a cold atmosphere, the object 1 to be thawed is housed in the thawing chamber 15VC, the upper 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 source is When the section 6 and the high frequency oscillator section 7 are operated, the object to be thawed 1 is heated due to dielectric loss and thawing begins. At this time, since the thawing chamber 15 and the lower passage 19 are maintained in a cold atmosphere,
Since the side and bottom surfaces of the object 1 to be thawed are cooled, local abnormal overheating of the surface is suppressed and uniform thawing is performed. During thawing, moisture generated from the thawed object 1 (hereinafter referred to as trip)
flows out onto the mounting plate 5. If this trip reaches or approaches the lower electrode 31fC, the insulation will be lost, and if a defrosting worker touches a part of the main body, it will be in a very dangerous situation. However, as shown in detail in FIG. 3, if a trip were to fall from the end of the mounting plate 5, it would fall onto the bulkhead plate 18, but the bulkhead plate 18 is in the form of a single sheet and protrudes from the shielding chamber 12. Therefore, it flows out of the shielding chamber 12.

In addition, since a predetermined gap is provided between the partition plate 18 and the high voltage side electrode 3, the trip that has passed between the lower surface of the partition plate 18 and the upper surface of the flange of the shielding chamber 12 is transmitted to the high voltage side electrode 3.
Without getting close to it, it falls to the side shown in the picture. As described above, even if moisture from trips or cleaning during thawing in the thawing chamber 15 enters below the mounting plate 5, it will never approach the lower electrode 3. It can be kept safe.

} In order to obtain uniform thawing, one factor is to ensure cold atmospheric conditions. To achieve this, it is necessary to reduce heat loss due to heat radiation and conduction from the thawing chamber 15, the cold blast cylinders 13 and 13', and the lower passage 19, and to reduce the heat capacity. Thawing chamber 15, lower passage 19, cooling wind cylinders 13, 13
' is kept in a cool atmosphere, and the outside is covered with a heat insulating material 11. Furthermore, since the room kept in the cold atmosphere and the shielding chamber 12 are separated by the partition plate 18 made of a material with low thermal conductivity, it is possible to suppress cold heat from flowing into the shielding chamber 12 by thermal conduction. can. Therefore, it becomes possible to maintain a cold atmosphere using the small refrigerator 14. Of course, since the partition plate 18 is made of a material with low dielectric loss, it is not heated during thawing. As described above, the present invention solves the conventional problems by reducing the overall size and increasing safety, and also has a chamber that is maintained in a cold atmosphere such as a thawing chamber, and a shielding chamber that houses the lower electrode. ,
Since they are separated by a partition plate made of a material with low dielectric loss and low thermal conductivity, electrical insulation and thermal insulation properties are improved.

In addition, as in the embodiment, if the end surface of the partition plate is made to protrude from the shielding chamber, and a predetermined gap is provided between the partition plate and the high-voltage side electrode, even if moisture such as a trip flows out from the thawing chamber, it will be close to the electrode. It is very safe as it can ensure electrical insulation without any problems. In addition, since the cold heat from the room maintained in a cold atmosphere is not conducted to the shielding room, heat radiation can be suppressed, and at the same time, the heat capacity can be minimized to make the refrigerator more compact.
Cooling efficiency is increased.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a main part of a conventional defrosting device, FIG. 2 is a sectional view showing an embodiment of the device of the present invention, and FIG. 3 is an enlarged sectional view of section A in FIG. 1...Object to be thawed, 2...Upper electrode, 3
... lower electrode, 7 ... high frequency oscillator section, 12 ... shielding chamber, 14 ... refrigerator, 15 ... thawing chamber, 18... Bulkhead plate.

Claims (1)

[Scope of Claims] 1. A thawing chamber that stores objects to be thawed, a refrigerator that maintains the thawing chamber in a cold atmosphere, a high-frequency oscillator section that supplies high-frequency energy to the objects to be thawed and is provided below the thawing chamber, and upper and lower parts. In the case where two electrodes are provided, the lower electrode is connected to the high voltage side and the upper electrode is connected to the ground side, a room where the cold atmosphere is maintained and a shielding room that houses the lower electrode are separated by dielectric loss and thermal conductivity. A high-frequency thawing device characterized in that it is separated by a partition plate made of small materials. 2. The high-frequency thawing device according to claim 1, wherein the end surface of the partition plate protrudes from the shielding chamber, and a predetermined gap is provided between the partition plate and the lower electrode.