JPS5926878Y2 - High frequency thawing device - Google Patents

Description

[Detailed description of the invention] This invention relates to a thawing device for frozen products such as meat and fish.
The purpose is to prevent localized abnormal heating and to achieve uniform thawing.

The conventional high-frequency thawing device using dielectric heating is a means of supplying high-frequency energy to the object to be thawed, compared to a means of irradiating high-frequency radio waves such as K2450MHz using a magnetron, which is found in electric microwave ovens, etc. There is an electrode means for heating an object to be thawed placed between two parallel electrodes using high-frequency radio waves having a low frequency.

FIG. 1 shows, as an example, a conventional example of electrode means.

A lower electrode 3 is provided below an object to be thawed 2 housed in a heating chamber 1, and an upper electrode 4 is provided above it.

Reference numerals 5 and 6 denote a flat lower cover and an upper cover that cover the upper and lower electrodes 3 and 4, and the object to be thawed 2 is placed on the lower cover 5 and heated by supplying high frequency power.

At this time, the surface of the object 2 to be thawed is thawed earlier than the inside, and the object 2 changes color, boils, and becomes soft due to the rise in surface temperature.

Further, due to the temperature rise on the surface of the object 20 to be thawed, the ice melts and becomes water.

(hereinafter referred to as "drip") Since this drip has a much larger dielectric loss than ice, more high-frequency energy is absorbed by the surface, heating the surface and corners unilaterally, and thawing progresses faster than the inside, resulting in uniform thawing. It was difficult.

Therefore, in the past, as a solution to the above drawbacks, a refrigerator (not shown) was mounted on the tower to blow cold air onto the object 2 to be thawed, thereby suppressing the temperature rise on the surface, suppressing excessive thawing in this area, and uniformly forming the inside and outside. A method is used to decompress the file.

However, the surface in contact with the object to be thawed 2 and the lower cover 5, the so-called bottom surface (resting place), has no cold air entering and drips flow to the bottom surface, absorbing a large amount of high-frequency energy, and thawing faster than surfaces other than the mounting surface and the inside. As a result, uniform thawing was not possible.

The present invention provides a high frequency decompressing device that overcomes the drawbacks of the prior art.

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 2 and 3, T is a heating chamber for storing the object 8 to be thawed, and is provided with an input port 9 for taking the object 8 into and out of the heating chamber γ.

The lower wall surface of the heating chamber γ constitutes a lower electrode 10 made of a conductive material such as aluminum or copper.

A mounting plate 11 is provided above the lower electrode 10 and is made of an insulator with low dielectric loss, such as polypropylene or Duracon, on which the object 8 to be thawed is placed.

A passage 12 is formed by providing a certain gap between the mounting plate 11 and the lower electrode 10.

Reference numeral 13 denotes a movable electrode that can be adjusted to an appropriate gap with the object 8 to be thawed, and is moved up and down by an electrode lifter 14 via a lift shaft 15.

16 is a shut holder that guides the lifting shaft 15;
1γ is an upper cover configured to cover the moving electrode 13 on the side of the object to be thawed 8; 18 is a high frequency oscillation source that supplies 8 VC high frequency energy to the object to be thawed; and the lower electrode 10. It is connected to the moving electrode 13 by lead wires 19 and 20.

21 is a cooling device and a compressor 22. Condenser 23. Condenser fan 24. Evaporator 25. It is composed of an evaporator fan 26 and the like, and is used to cool the object 8 to be thawed.

27 and 28 are intake ports and exhaust ports provided on the side wall surface of the heating chamber 1, and these intake ports 21. Exhaust port 28. and passage 1
Wind cylinders 29 and 30 are provided so as to communicate between the evaporator 2 and the evaporator 25 and evaporator fan 26 sides of the cooling device 21, respectively.

That is, the cold air generated by the cooling device 21 is transferred to the wind cylinder 29. as shown by the arrow in FIG. Heating chamber I2 passage 12. It flows through the circulating air path of the wind cylinder 30 and the evaporator 25, and maintains the heating chamber 1 and the passage 12 in a cool atmosphere.

31 is a drain port for draining water generated during defrosting of the cooling device 21, and 23 is a door that closes the input port 9.

Since the present invention is configured as described above, when thawing the object 8 to be thawed, the freezing device 20 is operated in advance, the heating chamber 72 passage 12 is maintained in a cold atmosphere, and the object to be thawed is kept in the heating chamber 7VC. 8 is housed and the high frequency oscillation source 18 is operated, a high electric field is applied between the electrodes 10 and 13 and heating is started.

At this time, the upper side of the surface of the object 8 to be thawed is cooled by the cold air taken in through the intake port 21.

Since cold air can pass through the housing and the passage 12, the bottom surface of the object 8 to be thawed is cooled via the mounting plate 11.

Since the entire length of the object 8 to be thawed is cooled in this manner, the bottom surface is prevented from being uncooled, which was a conventional problem, and the occurrence of drips is reduced.

Furthermore, even if some drips flow out and exist between the bottom surface of the object 8 to be thawed and the mounting table 11, there is a cooling effect, so even if high frequency energy is concentrated, it is possible to suppress the temperature rise of the drips.

In other words, the outflow of drip does not progress.

In addition, since the concentration of high-frequency energy does not reach other parts, the temperature rise on the entire surface is suppressed, and excessive thawing can be suppressed, allowing uniform thawing inside and outside.

As described above, the present invention provides a passage between the mounting plate on which the object to be thawed and the lower electrode are placed, and blows cold air into the heating chamber and the passage to cool the entire surface of the object to be thawed. The surface of the thawed object is thawed earlier than the inside, and the temperature rise caused by the concentration of high-frequency energy on drips on the bottom surface is suppressed, and the inside and outside of the object can be thawed uniformly.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main part showing a conventional structure, Fig. 2 is a front sectional view of the main part of a high frequency thawing device according to an embodiment of the present invention, and Fig. 3
The figure is a side sectional view of the same main part. γ...Heating chamber, 8...Thawing object, 10
... lower electrode, 11 ... mounting plate, 12
······aisle.

Claims (1)

[Scope of utility model registration request] A heating chamber that stores the items to be thawed, a high-frequency oscillation source that supplies high-frequency power to the items to be thawed, two electrodes at the top and a bottom, and a mounting plate on which the items to be thawed are placed, and cool air is supplied to the 770 heat chamber. A high-frequency thawing device having a cooling device for blowing air, wherein a passage is provided between the placement plate and the lower electrode, and cold air is blown into the passage and the heating chamber.