JPH0637674Y2 - Food defroster - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a food thawing device for continuously thawing food by dielectric heating using high frequency.

[0002]

2. Description of the Related Art Conventionally, a continuous thawing apparatus using a belt conveyor as in JP-B-51-15100 and a distance between a high voltage electrode and a ground electrode as in JP-B-60-9784 are changed. Therefore, although a defrosting device that defrosts by changing the strength of the high-frequency electric field is also known, it is a continuous type and the distance between the high-voltage electrode and the ground electrode is set to be gradually narrowed to set the strength of the high-frequency electric field in stages. There was no thawing device for thawing by changing the physical conditions.

[0003]

DISCLOSURE OF THE INVENTION In a conventional continuous thawing device using a belt conveyor, the electrolytic strength is always constant because the distance between the high voltage electrode and the ground electrode is constant.
The thawing time will depend on the conveyor speed of the belt conveyor, but the conveyor speed of the belt conveyor is constant, and it is possible to maintain the thawing target at a predetermined thawing temperature in each thawing step in the initial, middle, and late stages of thawing. However, there is a drawback that the thawed object cannot be thawed properly.

Further, in the case of changing the distance between the high voltage electrode and the ground electrode, there is a drawback that the thawing method is not suitable for the moving heatable method because the batch type fixed heating method is used.

In the present invention, the thawing method is a continuous moving heatable method using high frequency, and the distance between each high-voltage electrode and the ground electrode is set to be gradually smaller in the running direction of the belt conveyor, and the object to be defrosted is initially defrosted. It is an object of the present invention to provide a food thawing device capable of maintaining a predetermined thawing temperature in each of the middle and latter thawing steps.

[0006]

In order to achieve the above-mentioned object, in the present invention, in a belt conveyor for circulating a wide annular belt between belt wheels at both ends, a belt conveyor running in an annular belt between belt wheels at both ends. A lower electrode plate as a ground electrode is provided excluding the direction start and end portions, and an upper surface of the annular belt (that is, the lower electrode plate) is sequentially provided above the belt conveyor in a position facing the lower electrode plate in the traveling direction of the belt conveyor. An upper electrode plate as a plurality of high-voltage electrodes having a narrow interval is provided, and a high-frequency oscillator is connected to the upper electrode plate and the lower electrode plate by a conductive wire.

Further, a defrosting target carry-in port is opened at the running direction start end of the belt conveyor, and a defrosting target carry-out port is opened at the running direction end of the belt conveyer. A metal casing grounded together with the plate is provided.

[0008]

In the annular belt 2 between the belt wheels 3 and 3 at both ends of the belt conveyor 1, the start and end portions 1a, 1 of the belt conveyor 1 are
A lower electrode plate 4 serving as a ground electrode is provided except for b, and is arranged above the belt conveyor 1 so as to face the lower electrode plate 4 in sequence with respect to the traveling direction A of the belt conveyor 1.
Since the upper electrode plate 5 serving as a plurality of high-voltage electrodes is provided by narrowing the gap between the upper surface (lower electrode plate 4) and the high frequency oscillator 6 and the wires 7 and 8 are connected, each upper electrode plate 5 is connected.
And a high frequency voltage is applied to the lower electrode plate 4 separately, and the area of the electrode 5 is reduced with respect to the high frequency output,
The electric field strength becomes uniform.

Further, since the distance between each upper electrode 5 and the lower electrode 4 is gradually reduced in the traveling direction A of the belt conveyor 1, the permittivity (ε) of the object to be defrosted and The electric field strength can be increased by following changes in the dielectric power factor (tan δ).

Further, in the metal casing 9, the defrosted material carry-in port 1 is provided at the starting end 1a of the belt conveyor 1 in the traveling direction A.
Since the plurality of upper electrode plates 5 are surrounded and covered from below the belt conveyor 1 at the same end portion 1b except for the object to be thawed-out port 11, the leakage of high frequency to the outside can be prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The attached drawings showing an example of a food defrosting apparatus used for carrying out the present invention will be described in detail. FIG. 1 is an explanatory view showing the outline of the food defrosting apparatus of the present invention.

Reference numeral 1 is a known belt conveyor, in which an annular belt 2 is installed between belt wheels 3 and 3 at both ends, and the belt 2 is rotated in a traveling direction A by an electric motor or the like (not shown).

Reference numeral 4 denotes a lower electrode plate as a ground electrode, which is located in the central annular belt 2 excluding the start and end portions 1a and 1b in the traveling direction A of the belt conveyor 1 between the belt wheels 3 and 3 at both ends. It is installed in parallel with 2.

Reference numeral 5 denotes an upper electrode plate as a high-voltage electrode, which is above the belt conveyor 1 facing the lower electrode plate 4 and is spaced apart from the upper surface of the annular belt 2 in the running direction A of the belt conveyor 1 by 1, respectively. m, n, and n are provided in parallel with each other, and the height of each upper electrode plate 5 and the upper surface of the annular belt 2 is 1>m> n, and the height is sequentially increased in the feeding direction A of the belt conveyor 1. It is a small size.

A high-frequency oscillator 6 is connected to each of the four upper electrode plates 5 on the high-voltage side via a conductor wire 7, and the ground side is connected to the lower electrode plate 4 via a conductor wire 8. Board 5
A high frequency voltage of 13.56 MHz is applied between the lower electrode plate 4 and the lower electrode plate 4.

Reference numeral 9 denotes a metal casing for preventing high-frequency leakage to the outside. The upper and lower surfaces of the electrode plates 4 and 5 at the beginning and end 1a and the end 1b in the traveling direction A of the belt conveyor 1 do not exist. In addition, the object to be defrosted inlet 10 and the object to be defrosted outlet 11 are opened, respectively, to surround and cover both ends, both front and rear sides and all upper electrodes 5 of the belt conveyor 1.

Reference numeral 12 is a carrier roller which is rotatably supported on the lower surface of the upper annular belt 2 at an appropriate interval so that when the object to be defrosted 13 is placed on the upper surface of the belt conveyor 1 and conveyed, the upper surface of the belt conveyor 1 is conveyed. This prevents the annular belt 2 from loosening downward.

In using this, the height l between the upper surface of the annular belt 2 and each upper electrode 5 with respect to the traveling direction A of the belt conveyor 1 is adjusted according to the object to be thawed 13 to be thawed,
m, n, n are set so as to maintain a predetermined thawing temperature in each thawing step in the initial, middle and latter stages of thawing, and the thawed material 13 is supplied from the thawed material inlet 10 of the metal casing 9, The thawed object 13 that has been thawed is taken out from the thawed object carry-out port 11.

[0019]

The present invention is constructed as described above, and above the belt conveyor 1 which is opposed to the lower electrode plate 4 in the annular belt 2 installed between the belt wheels 3 and 3 at both ends of the belt conveyor 1. A plurality of upper electrode plates 5 are provided with the distance between the lower electrode plate 4 and the lower electrode plate 4 sequentially reduced in the traveling direction A of the conveyor 1, and a high frequency voltage from a high frequency oscillator 6 is applied between both electrode plates 4 and 5. Therefore, the electric field strength can be increased by following the changes in the permittivity (ε) and the dielectric power factor (tan δ) of the object to be thawed as the thawing progresses. Even if it is a heatable method,
The thawing target 13 can be kept at a predetermined thawing temperature in each thawing step in the initial, middle, and latter stages of thawing, and thawing suitable for the thawing target 13 can be performed.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the outline of a food defrosting device of the present invention.

[Explanation of symbols]

 1 Belt Conveyor 1a Start End 1b End End 2 Annular Belt 3 Belt Wheel 4 Lower Electrode Plate 5 Upper Electrode Plate 6 High Frequency Oscillator 7, 8 Conductor Wire 9 Metal Casing 10 Defrosted Object Inlet 11 Defrosted Object Outlet 12 Carrier Roller A Traveling direction

Claims (1)

[Scope of utility model registration request] 1. A belt conveyor (1) for circulating a wide annular belt (2) between belt wheels (3, 3) at both ends, and an annular belt (2) between belt wheels (3, 3) at both ends of the belt conveyor (1).
A lower electrode plate 4 as a ground electrode is provided inside the belt conveyor 1 except for the start and end portions 1a and 1b of the traveling direction of the belt conveyor 1, and above the belt conveyor 1 facing the lower electrode plate 4 in the traveling direction of the belt conveyor 1. On the other hand, the upper electrode plate 5 serving as a plurality of high-voltage electrodes is provided with a narrower space between them,
High-frequency oscillator 6 connected to conductors 7 and 8 respectively
Are provided, and the start and end portions 1a, 1 of the traveling direction of the belt conveyor 1 are provided.
a food casing characterized by being provided with a metal casing 9 which is provided with openings 10 and 11 for loading and unloading objects to be defrosted, surrounds the belt conveyor 1 and a plurality of upper electrode plates 5, and is grounded together with the lower electrode plate 4. Defroster.