JPS5867171A - High-frequency thawing apparatus - Google Patents

Abstract

PURPOSE:To prevent the flow of an overcurrent in mislaying a metallic material in a thawing chamber, by means of a hinged plate rising in closing a door. CONSTITUTION:A hinged plate 16 fixed on the top of a plate 5 is bent at the fulcrum 17, and is a continuous flat face which is a bridge between the plate 5 and an introductory door 14 of a thawing chamber when the introductory door 14 is opened. If the introductory door 14 is closed, the hinged plate 16 is supported in a raised state. Even if a kitchen knife 15 is mislaid near the inlet port of the thawing chamber, the hinged plate 16 is raised on closing the introductory door 14. Thus, the kitchen knife 15 is pushed to the interior and kept away from a shielding wall 9, and a high-frequency overcurrent will not flow.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for defrosting frozen products such as meat and fish using high frequency waves. The purpose of this is to prevent overcurrent from flowing when drips (moisture such as meat juices, etc.) flow out by forming a short circuit path for current from the high-voltage side electrode to the ground side through the intervention of the knife and drip.

It is constructed so that the object to be thawed is sandwiched between a pair of upper and lower electrodes, and several M
FIG. 1 shows a conventional high-frequency defrosting device that performs dielectric heating and defrosting using a high frequency of Hz.

In the figure, an earth side electrode 2 is provided on the top of the object 1 to be thawed, and a high voltage side electrode 3 is provided at the bottom with a predetermined gap, and a high frequency high voltage is applied between the two electrodes 2 and 3. is applied to heat and thaw the object 1 due to its dielectric loss. 4 is an insulating cover that covers the electrode 2 on the ground side, and 6 is a mounting plate made of an insulating material for placing the object 1 to be thawed and maintaining a gap with the electrode 3 on the high voltage side. be. Reference numeral 6 denotes a high-frequency oscillation unit that supplies high-frequency energy, and is shielded to prevent radio waves from leaking to the outside.

Reference numeral 7.8 denotes a power supply line for supplying power to the high voltage side electrode 3 and the earth side electrode 2, respectively. The high-voltage side power supply line 7 and the high-voltage side electrode 3 are covered with a shield wall 9 to prevent radio waves from leaking to the outside. 1° is an electrode lifting device that adjusts the ground side electrode 2 to contact or be close to the thawing target 1, 11
Reference numeral 12 indicates a motor serving as an elevating drive source, and 12 an outer casing of the defrosting device. Moreover, 13 is an input port for taking in and out the material to be thawed, and 14 is an input port weight.

Now, with the conventional high-frequency thawing device as described above,
A description will be given of a situation in which a thawing operation is performed while a metal object (the knife 15 in FIG. 2) is left on the mounting plate 5 near 3. In the high-frequency thawing machine having the structure described above, a high-frequency high potential difference is generated between the high-voltage side electrode 3 and the shield wall 9 during thawing operation, and a capacitor with a certain capacitance is formed between them. ing. If there is no metal object such as the knife 15 in FIG. 2, this capacitance is small, so almost no high frequency current flows between the high voltage side electrode 3 and the shield wall 9. However, when the Roga knife 16 is placed as shown in the figure, the capacitance between the high-voltage side electrode 3 and the shield wall 9 increases, causing a phenomenon in which a high-frequency current flows along the path shown by arrow a. Conventional high-frequency defrosting devices have the disadvantage that the breaker trips and the defrosting operation is no longer possible, or that an overcurrent flows through the vacuum tubes and damages the vacuum tubes. Furthermore, the above-mentioned phenomenon is not limited to metal objects such as kitchen knives, but may also occur when electrolytes are present, such as when the object to be thawed 1 is thawed and drips flow out near the input port.

The present invention solves the above-mentioned conventional drawbacks, and one embodiment thereof will be described below with reference to FIGS. 3 to 5.

3 to 6, reference numeral 16 is a hinge plate fixed to the upper surface of the mounting plate 5, which is bent at a fulcrum 17, when the input slot weight 14 is open as shown in Fig. 3. is a continuous flat surface bridging between the mounting plate 5 and the input port weight 14, but when the input port weight 14 is closed as shown in FIG. 4, it is supported in an upright state. Further, the position of the fulcrum 17 is inside the shield wall 9, (that is, D)
), the distance varies depending on the potential difference and frequency between the electrode 3 on the high voltage side and the shield wall 9, but if the potential difference is several KV and the frequency is several MHz, D = 10 to 20 degrees is good. , the one closer to the distance between the shield wall 9 and the end surface 18 of the high voltage side electrode 3 (D''-L) is better.

In the above configuration, even if the knife 15 is left near the inlet as shown in FIG. 3, the inlet weight 14
When the hinge plate 16 is closed, the hinge plate 16 stands up, so the knife 16 is pushed inward as shown at 161, and is moved away from the shield wall 9 by more than a distance, and unlike the conventional case, the knife 16 is pushed inward and moved away from the shield wall 9 by more than a distance. This phenomenon does not occur. In addition, if the amount of drip flowing out from the object 1 to be thawed is small, a step will be created between the hinge plate ends 19, and the shield wall 9 will be placed above this position.
Even if drip flows out, the shield wall 9 cannot be approached at any distance, so overcurrent caused by this can be prevented.

As described above, according to the present invention, if a thawing operation is performed while a metal object such as a knife or fork is left near the input port of the thawing chamber, or if drips flow out near the input port during thawing, This has the effect of preventing the formation of a short circuit path for current from the high voltage side electrode to the ground side due to the presence of metal objects or drips, thereby preventing interruption of the thawing operation and damage to the vacuum tube.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a conventional high-frequency thawing device, Fig. 2 is a detailed sectional view of the same inlet portion, and Fig. 3 is a high-frequency thawing device according to an embodiment of the present invention with the inlet weight open. FIG. 4 is a cross-sectional view of the input port with the dual-purpose entrance door closed, and FIG. 5 is a perspective view showing an embodiment of the hinge plate. 1...Object to be thawed, 2...°° ground side electrode, 3...High voltage side electrode, 5...Place plate,
9...Shield wall, 15...Knife, 1
6...Hinge plate, 17...-Fully point of hinge plate, D...Fist shield wall 9 and fulcrum 1 of hinge plate
Distance from 7. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Go to figure S Figure 5 7

Claims (2)

[Claims] (1) A thawing chamber that stores the items to be thawed, a door that opens and closes the front of the thawing chamber, a high-frequency oscillator that supplies high-frequency energy to the items to be thawed, and a lower electrode connected to the high voltage side and connected to the ground side. and an upper electrode,
Inside the thawing chamber, there was a hinge plate that moved in conjunction with the opening and closing of the door, and when the door was closed, stood up using a position on a mounting plate that was kept a certain distance from the shield wall at the bottom of the input port toward the thawing chamber as a fulcrum. High frequency thawing device. (2) The high-frequency thawing device according to claim 1, wherein the fulcrum of the hinge plate is located on the mounting plate near the front end surface of the lower electrode.