JPS603746Y2 - High frequency thawing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thawing device for frozen foods, and is intended to provide a compact high-frequency thawing device by improving the lifting device for the upper electrode.

Conventional high-frequency thawing equipment using dielectric heating uses, for example, 13M as a method of supplying high-frequency energy to objects to be thawed.
Using high-frequency radio waves with a relatively low frequency such as H2, dielectric heating is performed by configuring two upper and lower electrodes that sandwich the object to be thawed.

In this case, in order to maintain an appropriate gap between the object to be thawed and the electrode, an elevating drive device is provided to move the upper electrode.

This gap adjustment is performed by the operator in order to maintain an appropriate gap.

In order to prevent the upper electrode from moving beyond its movement range to the upper or lower side due to an erroneous operation, a limit switch is provided to stop the upper electrode at its upper and lower limits.

A conventional upper electrode lifting device will be explained with reference to FIG.

1 is a thawing chamber, 2 is a cooling air cylinder configured to blow cold air into the thawing chamber, 3 is a heat insulating material covering the cooling air cylinder, 4 is an upper electrode, and Figure 1 shows the state moved to the upper limit. .

Reference numeral 5 denotes a motor, the output portion of which is provided with a pinion, and is engaged with the rack 6.

Further, the motor 5 is installed outside the defrosting chamber 1, the cooling air cylinder 2, and the heat insulating material 3.

Reference numeral 7 denotes an elevating shaft whose one end is fixed to the upper electrode 4 and the other end is fixed to the rack 6.

8 is a limit switch operating arm fixed to the rack 6, 9 is a limit switch for stopping the upper limit of the upper electrode, and 10 is a limit switch for stopping the lower limit.

In the above upper electrode lifting device, if the downward movement distance of the upper electrode 4 is L, then the effective length of the rack is naturally also L.
Therefore, more than one length of the motor 5 would protrude above the motor 5, and the height of the high-frequency thawing device would become very high, resulting in a large size.

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

FIG. 2 is a diagram showing a part of the high-frequency thawing device of the present invention, in which numeral 11 is a thawing chamber for storing objects to be thawed, and the lower wall surface is made of a conductive material such as aluminum or copper and forms a lower electrode 12. ing.

Reference numeral 13 denotes a mounting plate on which an object to be thawed is placed, which is made up of an insulator provided so as to cover the lower electrode 12.

14 is a movable upper electrode whose lower part is covered with a cover 15 made of an insulator.

Reference numeral 16 denotes a cooling wind cylinder, which is equipped with an evaporator 18 of a refrigerator and a blower 19 inside, and is configured to guide cold air into the thawing chamber 11.

Outside the cooling wind cylinder 16, there is a condenser unit equipped with a thawing machine condenser 20, a compressor 21, a blower, etc.
22 is a heat insulating material constructed to cover the lower part of the thawing chamber 11 and the outer periphery of the cooling air cylinder 16.

23 is an upper electrode lifting device that adjusts the gap between the upper electrode 14 and the object to be thawed; 24 is a motor that is a driving source for raising and lowering the object; 25 is a high-frequency oscillation power source that supplies high-frequency energy to the object to be thawed; Upper electrode 14 and lead wire 26.
27.

Reference numeral 28 denotes a housing whose upper wall surface is spaced slightly from the upper surface of the motor 24.

The configuration of the lifting device for the upper electrode 14 will be explained in detail with reference to FIGS. 3 and 4. FIG.

A screw shaft 29 is fixed to the output shaft of the motor 24 which is a driving source.

A nut part 30 that engages with the screw shaft 29 is constructed, and the upper electrode 1 is connected to the extension part of the nut part 30 via a connecting holder 31.
4 is fixed.

32 is a guide pipe of the nut part 30, which has a plurality of recesses 33.
and engages with the convex portion 34 of the nut portion 30.

When the screw shaft 29 rotates, the nut 30 does not rotate because the concave portion 33 of the non-rotating guide pipe 32 and the convex portion 34 of the nut portion 30 are engaged.

Therefore, as the screw shaft 29 rotates, the nut portion 30 moves up and down.

Reference numeral 35 denotes a limit switch operating shaft, which is installed inside the guide pipe 32, passes through the hole 3.6 of the nut portion 30, and projects upward.

Further, the actuating shaft 35 has an upper surface position of the nut portion 30 when it is located at the upper limit of the upper electrode 14 and a lower surface position of the nut portion 30 when it is located at the lower limit of the upper electrode 14, respectively.
Stoppers 37 and 38 are fixed.

Further, an actuation arm 41 is fixedly attached to actuate the limit switches 39 and 40 for stopping the upper and lower limits of the upper electrode 14.

42 and 43 are springs, and when the upper electrode 14 is away from the upper and lower limit positions, for example when the upper electrode 14 is set at the intermediate position, the nut part 30 is lowered from the position shown in FIG. 3 and guided. It is located at approximately the middle height of the pipe 32.

At this time, the operating shaft 35 moves downward due to its own weight, and the operating arm 41 is moved from the operating point of the lower limit stop switch 40 so that the operating arm 41 fixed to the operating shaft 35 does not operate the lower limit stop limit switch 40. position it above.

That is, the actuating arm 41 biases the upper and lower limit switches 39 and 40 to the neutral position by a spring force.

44 is a board to which the motor 24 and guide pipe 32 are fixed.

The operation of the above-mentioned lifting device for the upper electrode 14 will now be described. FIG. 3 is a diagram when the upper electrode 14 is located at the upper limit.

The upper electrode 14 is lowered during thawing, and is maintained in this state after thawing is completed.

During thawing, since the upper electrode 14 is set above the object to be thawed as described above, the nut portion 30 is located below the position shown in FIG. 3.

Further, the actuation arm 41 has an upper/lower limit switch 3.
It is located between 9.40 and 40.

When the thawing is completed, the thawing operator energizes the motor 24 in order to move the upper electrode 14 upward.

When the motor 24 rotates, the rotation is transmitted to the screw shaft 29, causing the nut portion 30 to rise.

As it continues to rise, the upper end of the nut part 30 touches the operating shaft 3.
It abuts against a stopper 37 fixed to 5.

When the nut part 30 rises, the nut part 30 hits the stopper 37, so the actuating shaft 35 is pushed upward, the actuating arm 41 actuates the upper limit switch 39, and the operator cannot press the upper electrode 14 any further. It will no longer rise even if you perform an operation to raise it.

Next, when the operator performs an operation to lower the upper electrode 14, the motor 24 rotates in the opposite direction from when it was raised, and the screw shaft 29 rotates.

At this time, the nut portion 30 descends without rotating.

That is, the upper electrode 14 moves downward, and the operator can stop the operation at an appropriate position.

At this time, the operating shaft 35 moves slightly downward under the bias of the spring 42, opening the operation of the upper limit stop switch 39, and is held at the neutral point.

When the items to be thawed are not stored, the operator may make a mistake in operation,
When the nut part 30 moves downward when trying to lower the upper electrode 14, the lower surface of the nut part 30 hits the stopper 3.
8.

When the nut part 30 further descends, the actuating shaft 35 fixing the stopper 38 is pushed down slightly.
The lower limit stop switch 40 is operated to stop the upper electrode 14.

As described above, in the present invention, the electrode lifting mechanism moves the upper electrode up and down by the engagement of the screw shaft and the nut part.

The limit mechanism operates the actuating shaft that is activated by engagement with the upper and lower surfaces of the nut part, and activates the upper and lower limit stop switches. Since the upper surface can be configured, the height of the high-frequency thawing device can be reduced, allowing for miniaturization.

In addition, since the operating shaft is installed inside the guide pipe, there is no intrusion of dirt, etc., and since it is biased to the neutral point by a spring, the limit switch for upper and lower limit stops can be opened and closed reliably. It also has

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the upper electrode lifting device of a conventional thawing device.
Fig. 2 is a partial sectional view of a thawing device showing an embodiment of the present invention, Fig. 3 is a sectional view of the main part of the electrode lifting device, and Fig. 4 is a sectional view of a thawing device showing an embodiment of the present invention.
It is an AA sectional view of the figure. 11... Thawing chamber, 12... Lower electrode,
13... Mounting plate, 14... Upper electrode,
16... Cooling wind cylinder, 23... Upper electrode lifting device, 25... High frequency oscillation power source.

Claims (1)

[Scope of utility model registration request] It has two upper and lower electrodes configured to sandwich the object to be thawed,
In a high-frequency thawing device that adjusts the gap between the upper electrode and the object to be thawed, the upper electrode connected to the nut is raised and lowered by the engagement between the screw shaft and the nut, and the nut is moved up and down. A high-frequency thawing device configured to engage with a stopper fixed to an operating shaft at substantially upper and lower limit positions to operate the operating shaft, thereby operating a limit switch for stopping the lower and upper limits of the upper electrode.