JPS6043946B2 - 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.
The purpose is to improve insulation and its reliability.

Conventional dielectric heating generally performs defrosting work using a high frequency of several MH2 or higher. FIG. 1 shows a thawing device that performs dielectric heating and thawing at a relatively low frequency such as 13 MH2, which has two electrodes, upper and lower plates, configured to sandwich the object to be thawed. In the figure, reference numeral 1 denotes a thawing chamber, the bottom surface of which is a mounting plate 2 made of an insulator, and the side, rear, and top surfaces of the thawing chamber wall 3 made of a highly conductive material such as aluminum. Reference numeral 4 denotes an object to be thawed, and an upper electrode 5 connected to the ground side or an electrode lifting device 6 is movably attached to the upper part.

Reference numeral 7 denotes an electrode box provided below the mounting plate 2 of the thawing chamber 1, and the electrode box 7 and the wall surface 3 of the thawing chamber are electrically connected. 8 is a mounting plate 2 inside the electrode box 7.
, a lower electrode provided with a predetermined gap from the electrode box 7, and connected to the high voltage side.

Reference numeral 9 denotes a high-frequency oscillator unit that supplies high-frequency energy to the object 4 to be thawed, and is shielded to prevent noise from leaking to the outside.

Reference numerals 10 and 11 are power supply lines that feed power to the lower electrode 8 and the upper electrode 5, respectively.

In terms of circuitry, the thawing chamber wall 3, the electrode box 7, and the chassis of the high frequency oscillator section 9 are grounded together with the upper electrode 5.
In such a configuration, for example, when a part of the object 4 to be thawed comes into contact with the thawing chamber side wall 3, the high frequency electric field is concentrated on the part that abuts the thawing chamber side wall 3 (if moisture, trips, etc. The dielectric constant is also large, making it easier for the electric field to concentrate)
There is a risk that excessive current will flow and tracking will occur on the mounting plate 2 between the high-voltage electrodes, and there is also a risk that the device will catch fire.

As described above, the conventional thawing apparatus has poor insulation properties and lacks safety depending on how the object to be thawed is placed and its shape. The present invention provides a high-frequency decompressing device that eliminates the drawbacks of the conventional technology, and one embodiment of the present invention will be described below with reference to the drawings.

In Figures 2 to 5, 1 is the thawing chamber, and the bottom is the mounting plate 2.
, and a thawing chamber wall surface 3 made of a conductive material. 4 is the object to be thawed.

Reference numeral 5 denotes an upper electrode connected to the ground side, which is covered with an insulating cover 55 so that the object 4 to be thawed does not come into direct contact with the upper electrode 5.

The upper electrode 5 is fixed to an electrode lifting device 6 so that its height can be adjusted according to the thickness of the object 4 to be thawed. Reference numeral 7 designates an electrode box, which is electrically connected to the wall surface 3 of the thawing chamber over the entire circumferential wall, and has a predetermined internal space between the mounting plate 2 and the wall surface of the electrode box 7 in order to ensure an optimal thawing state. The lower electrode 8 is provided with a gap.

This lower electrode 8 is connected to the high voltage side. 9 is a high frequency oscillator section that supplies high frequency energy; 12 is a power supply section;
Reference numerals 10, 11, and 13 are power supply lines that respectively supply power to the lower electrode 8, the upper electrode 5, and the high-frequency oscillator section 9.

Reference numeral 14 denotes an insulating wall fixed to the inside of the wall surface 3 of the defrosting chamber with an insulating spacer 15 interposed therebetween. Further, a sealant 16 such as silicone is interposed at the joint between the mounting plate 2 and the insulating wall 14 to prevent moisture from entering the gap between the insulating wall 14 and the wall surface 3 of the defrosting chamber. In order to maintain the thawing chamber 1 in a cool atmosphere, it is equipped with a cooling coil 17, a cooling fan 18, a condensing coil 19, a compressor 20, etc., and communicates with the thawing chamber 1 through an intake port 21 and an exhaust port 22. . 2
3 is the main body of the defrosting device, and 24 is an input door.

FIG. 6 is a schematic circuit diagram of the main part of the present invention. As shown in the figure, the thawing chamber wall surface 3, the upper electrode 5, and the chassis of the high frequency oscillator section 9 are grounded. The decompression operation of the present invention will be explained next. When the object 4 to be thawed is stored in the thawing chamber 1, the upper electrode 5 is adjusted so as to be in contact with the object 4 to be thawed or to provide an appropriate gap, and the power supply section 12 and the high frequency oscillator section 9 are operated, the object 4 is thawed! The thawed material 4 is heated due to dielectric loss and thawing begins. As the thawing progresses, the ice will melt and become water in the case of tripping from the thawing object 4 or ice-packed thawing object, such as Epiblock. Here, no matter how the items to be thawed are placed, they are reliably insulated by the insulating wall 14,
There is no contact with the defrosting chamber wall surface 3 and the upper electrode 5, which are connected to the ground side, so there is no short-circuit phenomenon of high-frequency current, and there is no fear of carbonization, smoke, or ignition due to tracking. Furthermore, since the insulating wall 14 is attached to the thawing chamber wall 3 via an insulating spacer 15, the insulation distance can be very long and it can withstand a considerably high voltage electric field.Furthermore, in order to improve the reliability of the insulation, Since a sealant 16 such as silicone is applied to the upright end of the insulating wall 14, moisture will not enter between the upright end and the wall surface 3 of the defrosting chamber.As described above, in the present invention, moisture, trip , the objects to be thawed do not come into contact with the ground side, sufficient insulation distance can be guaranteed, and the reliability is also high.
It is possible to provide a safe defrosting device that does not cause fires due to smoke or ignition.

[Brief explanation of drawings]

Figure 1 is a schematic cross-sectional view of the main parts of a conventional high-frequency thawing device;
The figure is a cross-sectional view of a high-frequency thawing device according to an embodiment of the present invention, FIG. 3 is an enlarged sectional view of section A in FIG. 2, FIG. 4 is an enlarged sectional view of section B in FIG. 2, and FIG. 5 is an enlarged sectional view of section B in FIG. -C sectional view and FIG. 6 are circuit diagrams. 1... Thawing chamber, 2... Placement plate, 3...
... Defrosting chamber wall, 4... Items to be thawed, 5...
...Top electrode, 8...Bottom electrode, 14...
...Insulating wall, 15...Insulating spacer.

Claims (1)

[Claims] 1 A thawing chamber is equipped with a thawing chamber, a high-frequency oscillator section, and a pair of upper and lower electrodes, the lower electrode provided at the bottom of the thawing chamber is connected to the high voltage side, and the upper electrode provided in the thawing chamber is connected to the ground side to form the thawing chamber. A high-frequency thawing device with an insulating wall inside the thawing chamber wall.