JP2002364968A - Freezing point lowering refrigerating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a freezing point lowering refrigerator or the like whose purpose is the preservation of a food stuff at a temperature zone of -3 deg.C-0 deg.C without freezing the same. SOLUTION: A predetermined alternate electric field sufficient for generating a spatial electric potential of 200 V-500 V is generated in a space at a distance of 1 cm from the upper surfaces of respective metallic shelve plates 10 insulated with respect to at least an inside wall 2 in the freezing point lowering refrigerating device by applying alternate frequency of 100 Hz-50 Hz on the respective shelve plates. Therefore, a condition that fresh water is not frozen even when the temperature is lowered to a value lower than 0 deg.C by the predetermined electric field is produced to effect cold storage under this condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a freezing point refrigeration apparatus (refrigerator) capable of producing a state in which fresh water does not freeze even at 0.degree.

[0002]

2. Description of the Related Art Foods, such as vegetables, fruits and cakes, which are frozen and markedly damaged when the temperature is below 0 ° C., are stored at low temperatures (about 5 ° C. to 10 ° C.). In this case, there is a device that raises the humidity in the refrigerator to suppress evaporation of water from vegetables, fruits, and the like, thereby improving the ability to maintain freshness.

[0003]

However, low-temperature refrigeration has a limit in maintaining freshness and flavor, and there is a demand for a refrigeration apparatus having a longer lasting freshness and flavor, particularly in a refrigeration apparatus for business use. Is strong. In addition, a refrigeration apparatus that can store meat and seafood without freezing at a lower temperature is desired, and such a refrigeration apparatus for business use is particularly demanded. Furthermore, refrigeration equipment that can store vegetables, fruits, cakes, etc., and meat, seafood, etc. together without freezing at lower temperatures, that is, freezing ingredients at lower temperatures regardless of the type of ingredients. There is a demand for a refrigeration device that can be stored without being stored.

The present invention has been made in view of the above background, and it is a first object of the present invention to provide a freezing point refrigerating apparatus (refrigerator) capable of creating a state in which fresh water does not freeze even at 0 ° C. or less. In addition, an alternating potential (voltage, charge) supply device (power unit) which is a main part of the above-mentioned freezing point refrigerator (refrigerator)
Is the second purpose.

[0005]

The present invention has the following arrangement.

(Structure 1) In each of the metal shelves insulated from at least the inner wall of the refrigerator in the refrigerator, a space potential of 200 V or more is applied to a space at a distance of 1 cm from the upper surface of each of the shelves.
Enough to generate 500 V and at a frequency of 1
By applying a replacement potential of 00 Hz to 50 Hz, a predetermined replacement electric field is generated in the refrigerator, and the predetermined replacement electric field creates a state in which fresh water does not freeze even at 0 ° C. or less, and refrigeration is performed in this state. Characteristic freezing point refrigeration equipment.

(Structure 2) The inner wall of the refrigerator in the refrigerator is electrically insulated from at least the outer wall of the refrigerator main body.
At least the outer wall of the refrigerator main body is grounded to the ground, and one pole of the secondary high voltage side of the transformer is directly connected only to a metal shelf electrically insulated from the inner wall of the refrigerator. An apparatus in which the other pole of the next high voltage side is connected to the outer wall via a capacitor and a resistor, and an AC power supply is connected to both ends of the primary low voltage side of the transformer. Space potential 2 in a space 1 cm away from
Sufficient to generate 00V to 500V, and
By applying a alternating potential of a frequency of 100 Hz to 50 Hz, a predetermined alternating electric field is generated in the refrigerator, and the predetermined alternating electric field creates a state in which fresh water does not freeze even at 0 ° C. or less, and refrigeration is performed in this state. A freezing point refrigeration system characterized by the following.

(Configuration 3) Frequency 100 Hz to 65 Hz
3. The freezing point refrigerating apparatus according to the configuration 1 or 2, wherein the alternating potential is applied.

(Structure 4) The freezing point refrigerating apparatus according to Structure 2 or 3, further comprising a frequency converter for converting a frequency on a secondary high voltage side of the transformer.

(Structure 5) The freezing point refrigerating apparatus according to any one of structures 1 to 4, wherein a through hole is provided in a surface of the shelf board.

(Structure 6) The freezing point refrigerating apparatus according to any one of Structures 1 to 5, wherein a projection is provided on a surface of the shelf board.

(Structure 7) A freezing point refrigeration refrigerator according to any one of Structures 1 to 6, further comprising a door switch for energizing / disconnecting an AC power supply on the primary low voltage side of the transformer according to opening and closing of the door. apparatus.

(Structure 8) An alternating potential supply device used for a freezing point refrigeration system, which is a means for supplying AC power to both ends of a primary low voltage side of a transformer, and connected to one pole of a secondary high voltage side of the transformer. The output cord that is insulated and coated with a secondary high-voltage line that is directly connected only to a metal shelf plate that is electrically insulated from the inner wall of the warehouse, and the other pole of the secondary high-voltage side of the transformer, And an earth terminal connected to the capacitor and the resistor in this order.

(Structure 9) The alternating potential supply device for a freezing point refrigeration apparatus according to Structure 8, further comprising a slidac or a variable resistor for adjusting a potential at one pole on the secondary high voltage side of the transformer.

(Structure 10) A replacement potential for a freezing point refrigeration system according to Structure 8 or 9, wherein a door switch is provided for turning on / off an AC power supply on the primary low voltage side of the transformer in accordance with opening and closing of the door. Feeding device.

(Structure 11) The alternating potential supply device for a freezing point refrigeration device according to any one of structures 8 to 10, further comprising a frequency converter for converting a frequency on a secondary high voltage side of the transformer.

[0017]

According to the present invention, a space potential at a distance of 1 cm from the upper surface of the shelf plate is placed on a metal shelf plate electrically insulated at least from the inner wall of the refrigerator by a predetermined alternating potential supply device. It is sufficient to generate 200 V to 500 V, and by applying an alternating potential having a frequency of 100 Hz to 50 Hz, and forming a predetermined alternating electric field in the refrigerator, to create a state in which fresh water does not freeze below 0 ° C. Refrigeration is performed in this state. Thus, the food can be stored at a temperature of 0 ° C. or lower without freezing. Thus, the state in which fresh water does not freeze at 0 ° C. or less is considered to be obtained by a combination of a predetermined space potential and a predetermined frequency, that is, a predetermined alternating electric field of the present invention (first feature). In addition, the water contained in the food is usually a solution in which some solute is dissolved, and thus causes a freezing point drop. The freezing point of ordinary fresh food (the temperature at which ice crystals begin to form) is-
Storage at a temperature in the range of 2.5 to -0.5 [deg.] C. and above the freezing point and in a negative temperature is called deep chilling.
In addition, water in foodstuffs does not freeze to about −2 ° C. inside water bound to amino acids and the like, but water near the surface (free water) freezes at 0 ° C. For this reason, in the case of normal chilled refrigeration, the refrigerator is in a semi-frozen state. The “state in which fresh water does not freeze below 0 ° C.” in the present invention is a state in which fresh water does not freeze (a state in which fresh water has a freezing point lowered), and is different from deep chilling or chilled refrigeration that is not in such a state. In deep chilling, the freezing point is-
When storing various foods in the range of 2.5 to -0.5C together, it is necessary to set the internal temperature to -0.5C or higher, but in the present invention, for example, -3 to 0C. The temperature inside the refrigerator can be reduced to, for example,
° C, so that various foods can be stored together at lower temperatures. Usually, the temperature in the refrigerator fluctuates throughout the day and night. For example, when the temperature in the refrigerator is set to -1 ° C, the temperature in the refrigerator reaches -3 ° C at midnight. Therefore, for example, when the temperature in the refrigerator is set to -1 ° C, in the deep chilling, a part of the food may be frozen due to the fluctuation in the temperature in the refrigerator. Since fresh water is not frozen, there is no danger that a part of the food will freeze even if the temperature changes in the refrigerator. In addition, vegetables, fruits, cakes, and other foods that freeze and become severely damaged when the temperature is 0 ° C or less cannot be stored at a temperature of 0 ° C or less conventionally. Even foods that freeze and become severely damaged at a temperature of 0 ° C. or less can be stored at a temperature of 0 ° C. or less without freezing. In the present invention, "creating a state in which fresh water does not freeze even at 0 ° C. or less and performing refrigeration in this state" usually means performing refrigeration in a temperature range of 0 ° C. or less where fresh water does not freeze, for example, If the fresh water does not freeze up to -3 ° C, it means that the refrigerator is refrigerated in the temperature range of -3 ° C to 0 ° C. 0 considering the fluctuation of
The case where refrigeration is performed in a temperature range of about ° C (eg, -1 ° C to + 1 ° C) is also included.

According to the present invention, food can be stored at 0 ° C. or lower (for example, in a temperature range of −3 ° C. to 0 ° C.) without freezing due to freezing point depression. By this freezing point depression, bacteriostatic (meaning to suppress the growth of specific bacteria) and bacteriostatic (meaning to suppress the growth regardless of the type of bacteria)
Improves frost resistance, reduces the amount of water discharged outside, suppresses self-digestion (enzyme activity) of foodstuffs,
Phenomena such as suppression of oxidation occur, and as a result, it is possible to maintain the freshness and flavor of the foodstuff.

Hereinafter, embodiments of the present invention will be described.

FIG. 1 is a schematic diagram for explaining a freezing point refrigerator according to an embodiment of the present invention.

In the present invention, the metal shelves 10 insulated from the inner wall 2 of the refrigerator in the refrigerator 1 have a space potential of 200 V to 50 V in a space 1 cm away from the upper surface of the shelves.
0 V and at a frequency of 100
A predetermined alternating electric field is generated in the chamber by applying a alternating potential of 50 Hz to 50 Hz, and a state in which fresh water does not freeze even at 0 ° C. or less by the predetermined alternating electric field is created. It is characterized in that refrigeration is performed at the refrigerator temperature.

If the space potential at a distance of 1 cm from the upper surface of the shelf board is less than 200 V, the electric field is weakened and the freezing point lowering effect cannot be obtained. Even if the space potential exceeds 500 V, no improvement in the freezing point lowering effect is observed. The voltage applied to the shelf 10 needs to be changed according to the number of shelves (proportional to the volume), and the spatial potential at a distance of 1 cm from the upper surface of the shelf becomes 200 V or more, preferably 200 V or more.
Adjust so as to be ~ 500V. Space 12 between shelves
Of the spatial electric field (alternate electric field) can be measured by an AC voltage detector (for example, Multi V600 manufactured by Multi Corporation).

The frequency of the alternating electric field must be 100 Hz or less. If it exceeds 100 Hz, the freezing point lowering effect cannot be obtained. 100Hz ~
70Hz, 100Hz-80Hz, 100Hz-90H
z is preferred. In consideration of the frequency fluctuation range, the upper limit of the set frequency is preferably about 95 Hz. When the frequency is less than 50 Hz, the effect is reduced and the cost is increased. Adjustment of the frequency can be performed by a frequency converter. When the frequency converter is inserted, the maximum freezing effect can be obtained by adjusting the frequency. The frequency converter is usually placed on the primary low frequency side in FIG. 1 (for example, between the two lines on the primary low frequency side, for example, at the position 26).

For example, the space potential 2 at a distance of 1 cm in the direction perpendicular to the upper surface (or lower surface) of each shelf
When the frequency is 50 V to 60 Hz at 00 V to 500 V, it is possible to create a state in which fresh water does not freeze in a temperature range of about -2C to 0C. This fresh water does not freeze -2 ℃ ～ 0 ℃
Refrigeration in the temperature zone of -2 ℃ ~ 0 ℃
It can be stored without freezing in the temperature range. When the frequency is 70 Hz, it is possible to create a state where fresh water does not freeze in a temperature range of about −3 ° C. to 0 ° C. When the frequency is 80 Hz, a state in which fresh water does not freeze in a temperature range of about −3.5 ° C. to 0 ° C. can be created. Frequency is 90Hz
In this case, a state in which fresh water does not freeze in a temperature range of about −4 ° C. to 0 ° C. can be created. When the frequency is 100 Hz,
A state in which fresh water does not freeze in a temperature range of 4.5 ° C to 0 ° C can be created.

The freezing drop effect is obtained mainly by the alternating potential (voltage) and its frequency. However, the freezing drop effect is affected by the number of shelves, the area of the shelves, the spacing between the shelves, and the like. Changes). The shelf space S is
About 5 to 40 cm is preferable, about 10 to 30 cm is more preferable, and about 10 to 20 cm is more preferable. The standard number of shelves and the area of the shelves in the case of a commercial refrigerator having a normal volume (about 400 to 2,000 liters), and if the shelves are 10 to 20 cm apart, the shelves 1
When the applied voltage to 0 is AC 500 V to 1000 V, a sufficient freezing point lowering effect can be obtained. In this case, the voltage is preferably AC 800 V to 1000 V from the viewpoint of enhancing the freezing point lowering effect. If the voltage is less than AC 500 V, the electric field becomes weak, and the freezing point drop effect cannot be obtained. In the case of a prefabricated refrigerator (about 1 tsubo to 30 tsubo), for example, a case where a metal rack having about 4 to 5 shelves having an area of 60 cm x 180 cm and a shelf space of 30 to 40 cm is provided in the refrigerator. For example, the voltage applied to the shelf board 10 is preferably 1000 V to 2000 V AC. A
If it is less than C1000V, a sufficient freezing point lowering effect cannot be obtained. The effect does not change even if the voltage is increased from AC2000V. Also, in view of the insulation resistance of a normal refrigerator body, A
Applying a voltage exceeding C2000V is dangerous and unsuitable for practical use. When the volume of the prefabricated refrigerator is large and a plurality of metal racks are installed in the refrigerator, it is necessary to install a replacement potential supply device for each metal rack. 1
If there are too many shelves connected to the alternate potential supply devices, a sufficient freezing point drop effect cannot be obtained due to the voltage drop.
In the case of a commercial refrigerator or the like having a normal capacity as described above, when the voltage value on the secondary high voltage line (conductive wire) 23 on the secondary high voltage side is AC 500 V to 2000 V, the voltage of the shelf plate causes a voltage drop on the shelf plate. The upper potential drops by about 100V.

A second feature of the present invention resides in a freezing point refrigeration apparatus having a predetermined configuration. The pole 22a on the secondary high voltage side of the transformer 21 in the alternating potential supply device 20 is directly connected to the shelf 10 without any intervening resistance or the like. If a resistor is interposed in the secondary pole 22a connected to the shelf 10 on the secondary high voltage side, the potential on the shelf decreases due to the voltage drop due to the resistance, and the freezing point drop effect decreases. In this apparatus, the secondary high voltage side pole 22a
And the current on the shelf 10 is zero or too small to measure. That is, the present apparatus is characterized in that no current flows even though there is an alternating potential due to alternating current. The shelf plate 10 directly connected to the secondary pole 22a on one side and the capacitor 24 and the resistor 2
It is considered that a freezing point lowering effect is obtained by an alternating electric field formed between the outer wall 4 and the outer wall 4 connected to the outer wall 5.
This device is considered to have a structure in which a kind of capacitor is formed between the shelf board 10 and the outer wall 4 on an electric circuit.

The secondary high voltage line 23 on the secondary high voltage side is
Connect directly to everything. In other words, the invention of the present application is a method in which both poles on the secondary high voltage side are alternately connected to the shelf plate to apply an alternating current (for example, the pole 22a on the secondary high voltage side is directly connected to the 1, 3, 5,. And connect the other pole 22b of the secondary high voltage side to 2, 4,
6… Method of applying AC by directly connecting to the shelf of the stage)
Also, this is different from the method in which one pole on the secondary high voltage side is connected to the first, third, fifth,... In these systems, the freezing point lowering effect as in the present invention is not obtained. It is preferable that the secondary high-voltage line 23 be wired to the shelf 10 at the shortest and not be looped. This is to prevent generation of electromagnetic waves and avoid adverse effects on peripheral electronic devices.

Another pole 22b on the secondary high voltage side of the transformer
Is connected to the outer wall 4 via the capacitor 24 and the resistor 25, and when the outer wall 4 is grounded to the ground, the strength of the alternating electric field increases. The other pole 22b on the secondary high voltage side of the transformer is
If it is connected directly to the outer wall 4 without passing through the capacitor 24 and the resistor 25, there is a danger when a show is performed. In addition, outer wall 4
Other pole 22b on the secondary high voltage side grounded to the ground via
The resistance 25 interposed between the shelf 10 and the outer wall 4 makes it difficult to receive an electric shock even if the user touches the shelf 10 and the outer wall 4 at the same time. Generally, a female feels a current of 5 mA, and a male feels a current of 8 mA.
It is preferred to be less than. For example, if the resistance 25 is 5 MΩ
In this case, the current becomes 2 mA or less, and the user does not feel the current or receive an electric shock. For these reasons, the resistance of the resistor 25 is preferably about 3.9 to 5 MΩ. The capacity of the capacitor is set at 0.01 from the viewpoint that the capacitor is punctured and cuts off the current in the event that an instantaneous current (excessive current) flows, and that the possibility that a high frequency rarely flows to the secondary high voltage side is prevented. ~ 0.03MF (Mega Farad)
The degree is preferred.

For safety reasons (prevention of electric shock), an electromagnetic door switch (contact switch) 27 is attached to each door. Thus, when the door is opened, the primary power is cut off by the relay 28, and electric shock can be prevented. 29 is a power switch.

When at least the metal outer wall 4 of the refrigerator main body is grounded to the ground, there is an effect that the freezing point lowering effect is enhanced by interaction with the potential of the shelf 10. In addition, when the metal outer wall 4 is grounded to the ground, an electric shock in the event of a leak to the metal outer wall 4 can be prevented, and an electric field inside the refrigerator can be prevented from leaking to the outside to prevent adverse effects on peripheral electronic devices. Etc. If the metal outer wall 4 is not grounded to the ground,
The freezing effect is reduced by half. Metal outer wall 4 of refrigeration unit body
In addition, a metal part such as a metal frame (not shown) that conducts or does not conduct with it can be grounded to the ground, and is preferably grounded.

In the present invention, in order to insulate the metal shelf from the inner wall of the storage, (1) the metal inner wall 2 in the storage must be
An embodiment in which the insulating member 5 is stuck on the entire inner wall of the refrigerator without any gap (FIG. 1). (2) An insulating member is stuck on the inner wall of the refrigerator without any gap on the entire inner wall of the refrigerator. A mode in which an insulating material is interposed at a portion where the support is fixed to the inner wall of the warehouse (an embodiment shown in FIG. 6 to be described later), and (3) a metal shelf plate is contacted with a metal inner wall in the warehouse in a non-contact manner through a space. Install,
A mode in which an insulating member is interposed at the lower portion of the metal support, (4) a metal shelf is installed in a non-contact manner with a metal inner wall in the refrigerator via a space, and the shelf is supported by the insulating support; Examples include a mode in which each shelf is wired with conductive wires, and a mode (5) in which the inner wall of the refrigerator is formed of an insulating resin integrally molded product or the like.
Of these, the embodiment (2) is most preferred. If the metal shelf is not insulated from the inner wall of the refrigerator, the inner wall of the metal refrigerator is usually not insulated from the refrigerator or the outer wall. Current flows through it, no alternating electric field is formed, and no freezing-point-lowering effect is obtained. Further, when the inner wall of the refrigerator is made of metal and the inner wall of the refrigerator is insulated from the refrigeration apparatus main body and the outer wall, the voltage drop is increased by the metal inner wall 2 so that the freezing point drop effect is reduced or the freezing point lowers. The effect may not be obtained. It goes without saying that the metal shelf plate insulates not only the inner wall of the refrigerator but also all parts of the refrigerator main body (for example, the metal outer wall and the metal frame of the refrigerator main body).

If the inner wall of the refrigerator is made of metal, the secondary high voltage side pole 22a is connected only to the shelf 10 in the refrigerator, and the secondary high voltage side pole 22a is connected to the metal inner wall 2. I haven't.
This is because when the secondary high voltage side pole 22a is connected to both the shelf plate 10 and the metal inner wall 2, the metal inner wall is usually insulated from the refrigeration apparatus main body and the outer wall. Because there is no current, an electric current flows from the metal inner wall to the ground through the outer wall, an alternating electric field is not formed, and a freezing point drop effect cannot be obtained. Further, when the inner wall of the refrigerator is made of metal and the inner wall of the refrigerator is insulated from the refrigeration apparatus body and the outer wall,
This is because the voltage drop is increased by the metal inner wall 2 and the freezing point lowering effect is reduced or the freezing point lowering effect is not obtained.

It is preferable that the entire inner wall of the refrigerator is insulating. If the insulation breaks for any reason, the inner wall of the metal refrigerator is usually not insulated from the refrigerator or the outer wall, so current flows from the inner wall to the ground through the outer wall, Since no electric field is formed, no freezing point drop effect occurs. Further, if the insulation is broken for any reason, the inner wall of the refrigerator is made of metal, and if the inner wall of the refrigerator is insulated from the refrigerator main body or the outer wall, the metal inner wall 2 causes a large voltage drop. The freezing point lowering effect is reduced or the freezing point lowering effect is not obtained. Similarly, it is preferable to electrically insulate the metal inner wall in the refrigerator in the refrigerator from the refrigerator main body. If the insulation breaks for any reason,
Electric current flows to the ground via the refrigeration apparatus main body, and the freezing point drop effect disappears.

The metal shelf plate may be in any form such as a plate shape, a sashimi shape, a wire mesh shape, a plate having a through hole (hole) formed therein, or a plate having a recess formed therein. For example, as shown in FIG. 7, in the case of a plate-like shelf 10 (a stainless steel plate having a thickness of 0.8 mm), through-holes 12 of 1 cmφ are opened vertically and horizontally across the entire surface of the shelf at a pitch of 1 cm. The holes promote the circulation of cool air and enhance the electric field effect. Further, it is preferable to provide a projection on the shelf plate because the electric field effect is improved. Projection height is about 0.1mm ~ 1mm,
If it is preferably about 0.5 mm, the electric field effect is improved. For example, as shown in FIG. 8, when the protrusion 13 of about 0.5 mm is formed along the circumference of the through hole 12 of 1 cmφ, the electric field effect is significantly improved. In the case of business use, the material of the metal shelf plate is preferably stainless steel or a material equivalent to stainless steel.

FIG. 2 shows a detailed embodiment of the circuit diagram of the alternative potential supply device. The power supply 30 used is not particularly limited,
AC100V or 200V, 50 ~
Use 60 Hz. In this case, AC100V and 20
It is preferable to adopt a configuration capable of coping with both 0V. The maximum output voltage of the primary pole 22a on the secondary side of the high-voltage transformer 21 is 2000 V AC.
It can be continuously varied in the range of -2000V. Normally used output voltage is AC500-1000V
It is. The current on the primary side of the high-voltage transformer 21 is 20 mA (milliampere) when measured with the secondary side short-circuited at a power supply of 100 V and a secondary output voltage of 1000 V. When the power supply used is 100 V, the secondary output voltage 2
At 000 V, it is 40 mA (milliamps). The ground resistance 25 is 5 MΩ (mega ohm). Earth condenser 24 is 0.01MF (Mega Farad)
(At 2.5 kV). The power used is 5 W / hour at maximum.

For safety reasons (prevention of electric shock), an electromagnetic door switch (contact switch) 27 is attached to each door. As a result, when the door is opened, the relay contact 28 'is opened by the relay 28 and the primary power supply is cut off, thereby preventing electric shock. Energizing (blue) lamp 31
Indicates an energized state. Turns off when the power is turned off or when the door is opened. The alarm (red) lamp 32 indicates an alarm, and is normally off. When the breaker (also used as a power switch) is activated, the switch 34 is closed in conjunction with this, and the red lamp 32 is turned on to issue an alarm. As a breaker (also used as a power switch), for example, CP-32V
M / 1K (manufactured by Fuji Electric Co., Ltd.) can be used. In FIG. 2, TB indicates a connection terminal, ThF indicates a thermal fuse, and 35 indicates an AC voltmeter. The alternating potential supply device is provided with a commercial power supply (AC 100 V or 200 V, 5
0 to 60 Hz) by means of a high-voltage transformer to generate an alternating potential of 500 to 2000 V, 50 to 60 Hz on the secondary electrode 22a on the secondary side.

FIG. 3 is a perspective view showing one embodiment of the appearance of the alternating potential supply device. Breaker (also used as power switch)
33, energizing (blue) lamp 31, alarm (red) lamp 3
2 is the same as that described in FIG. The output cord 23 ′ is a secondary high-voltage wire 23 connected to the secondary pole 22 a of the secondary side of the high-voltage transformer 21 and is insulated.
The ground terminal 36 is connected to the other pole 22b on the secondary side of the high voltage transformer 21 via the resistor 25 and the capacitor 24. When adjusting the secondary voltage, when the voltage adjustment knob 37 is provided, the voltage adjustment knob 37 is used to adjust the secondary slide voltage.
Adjust by adjusting 6. When the voltage adjusting knob 37 is not provided, the secondary side voltage is adjusted by, for example, removing the screw at the lower part of the case and adjusting the slide back with a flathead screwdriver. The secondary voltage can be confirmed by the pointer of the meter 38. The case size is, for example, width 265 to 280 mm x depth 95 to 100
mm × height 150 to 185 mm. Weight is 3k
g.

FIG. 4 shows a commercial refrigerator (2 to 6 doors).
FIG. 3 is a partial cross-sectional view showing a mode in which a replacement potential supply device 20 is installed. FIG. 5 is a partial cross-sectional view showing a mode in which the alternating potential supply device 20 is installed in a prefabricated refrigerator (about 1 tsubo to 30 tsubo), and a metal shelf 10 (for example, having a diameter of 3 to 3 tsubo).
A metal rack 1 including a shelf plate in which round bars of about 5 mm are arranged in parallel at intervals of 2 cm) and a metal shelf support 11
4 are installed in the storage, and the alternating potential supply device 20 is installed for each metal rack 14. The lower part of the shelf support 11 is installed on the floor via an insulating material. As shown in FIGS. 4 and 5, the alternating potential supply device 20 is usually installed on the upper part of the refrigerator. The alternating potential supply device 20 needs to be installed at least 20 cm away from the temperature control microcomputer of the refrigerator in order to prevent the temperature control microcomputer from malfunctioning due to electromagnetic waves generated from the device. It is preferable that the secondary high-voltage line 23 be wired to the shelf 10 at the shortest and not be looped. This is to prevent generation of electromagnetic waves and to avoid adverse effects on peripheral electronic devices and the like due to the electromagnetic waves. 4 and FIG. 5 are denoted by the same reference numerals as those in FIG. 1 and FIG. In these drawings, the inner wall and the heat insulating material between the insulating sheet (insulating material) 5 and the metal outer wall 4 are omitted.

As shown in FIG. 6, a general commercial refrigerator has a structure in which a heat insulating material 3 is interposed between an outer wall 4 (external steel plate) made of stainless steel and an inner wall 2 (internal steel plate) made of stainless steel. (The inner and outer walls are usually not insulated). Since the inner wall and the outer wall are made of stainless steel, the inner wall and the outer wall are hardly corroded and easy to clean. When the present invention is applied to an ordinary commercial refrigerator after being improved, the improvement may be performed as follows. First, an insulating sheet 5 (for example, a vinyl chloride sheet or a vinyl chloride plate having a thickness of 3 mm) is stuck on the inner wall of the refrigerator 2 without any gap. Next, a square member 6 made of an insulating material (for example, a 10 mm-thick vinyl chloride square member) is fixed to the inner wall 2 of the refrigerator with screws 7 or the like. The head such as the screw 7 is caulked. Next, a shelf-less support pillar 11 made of stainless steel is fixed to the square member 6 made of an insulating material by a screw 8 or the like. A crimp terminal 23a provided at the end of the secondary high-voltage wire (conductive wire) 23 is crimped to the shelf receiving support 11 made of stainless steel with a screw 8 or the like and connected. A sheenless shelf plate 10 is held (supported) by a sheenless shelf fitting 13 provided on the shelf support column 11. An alternate potential is supplied from the secondary high voltage line 23 to each shelf 10 via the shelf support pillar 11 and the shelf support 13. If the insulation is broken for any reason, a current flows to the ground and the effect disappears, so the above-mentioned insulation processing is extremely important. The present invention can be applied to ordinary commercial refrigerators with improvements. That is, the atmosphere in a normal commercial refrigerator is changed, and the freezing point lowering effect is obtained.

[0040]

Embodiments of the present invention will be described below.

Example 1 and Comparative Examples 1-2 Using a freezing-point refrigeration apparatus having the structure shown in FIGS. 1-4, 6, and 7, an alternating potential of 1000 V AC and a frequency of 50 Hz was applied to each shelf. , The temperature inside the refrigerator was set to 0 ° C. The shelves were 20 cm apart, 2,000 liters in volume, and eight shelves. A glass filled with fresh water was placed on a shelf in the refrigerator, and observed overnight. Even when the set temperature in the refrigerator was 0 ° C, the temperature in the refrigerator reached -3 ° C at night. as a result,
The water in the glass containing fresh water did not freeze. Where-
At 2.6 ° C. thin ice evolved. Also, internal temperature -2.5 ° C
Confirm that the food can be stored without freezing within the range of ~ 0 ° C, especially foods such as vegetables, fruits and cakes that freeze and become severely damaged when the temperature is set to 0 ° C or less without deteriorating the freshness and flavor of the food. It was confirmed that it could be stored in the temperature range. As Comparative Example 1, the temperature in the refrigerator was set to 0 ° C. without applying an alternating potential to each shelf. A glass filled with fresh water was placed on a shelf in the refrigerator, and observed overnight. As a result, the water in the glass containing the fresh water completely frozen in about 12 hours, and remained frozen. In addition, as a comparative example 2, in FIG. 1, when (1) the secondary high voltage side pole 22a is connected to both the shelf board 10 and the metal inner wall 2, (2) the secondary high voltage side of the transformer The other pole 22b,
When not connected to the outer wall 4 via the capacitor 24 and the resistor 25, (3) When the metal outer wall 4 is not grounded to the ground, (4) When the other pole 22b on the secondary high voltage side of the transformer is insulated and closed, Was tested in the same manner as in Example 1, and as a result, the effect of lowering the freezing point as in the present invention was not obtained.

Example 2 Using the same apparatus as in Example 1 above, each shelf was
V and an alternating potential of a frequency of 95 Hz was applied, and the temperature in the refrigerator was set to -3 ° C. A glass filled with fresh water was placed on a shelf in the refrigerator, and observed overnight. As a result, the water in the glass containing fresh water did not freeze. However, thin ice was generated at −3.5 ° C.

COMPARATIVE EXAMPLE 3 One pole 22a of the secondary high voltage side of the transformer is a resistor (5 MΩ).
And the other pole 22b on the secondary high voltage side of the transformer is directly grounded to the ground without passing through the capacitor 24 and the resistor 25, and the other pole 22a is connected to the pole 22a on the secondary high voltage side.
A test was performed in the same manner as in Example 1 except that a constant potential (DC potential) of 00 V to 2000 V or an alternating potential was applied. The temperature in the refrigerator was set to 0 ° C., and a cup filled with fresh water was placed on a shelf plate in the refrigerator, and observed overnight. as a result,
The water in the glass filled with fresh water was completely frozen, and no freezing point effect was obtained.

Comparative Example 4 One pole 22a of the secondary high voltage side was directly connected to the first, third, fifth,...
The test was performed in the same manner as in Example 1 except that an alternating current was applied by connecting to the shelf at the tier. The temperature in the refrigerator was set to 0 ° C., and a cup filled with fresh water was placed on a shelf plate in the refrigerator, and observed overnight. As a result, the water in the glass containing the fresh water was completely frozen, and the freezing point lowering effect was not obtained.

COMPARATIVE EXAMPLE 5 One pole 22a on the secondary high voltage side was connected to the first, third, fifth,...
The test was performed in the same manner as in Example 1 except that the other pole 22b on the secondary high voltage side was directly grounded to the ground without passing through the capacitor 24 and the resistor 25, and an alternating current was applied. The temperature in the refrigerator was set to 0 ° C., and a cup filled with fresh water was placed on a shelf plate in the refrigerator, and observed overnight. As a result, the water in the glass containing the fresh water was completely frozen, and the freezing point lowering effect was not obtained.

The present invention is not limited to the above embodiment.

For example, the potential and frequency of the alternating potential applied to the shelf board can be appropriately adjusted within a range where the effects of the present invention can be obtained. The present invention can be used not only for foodstuffs but also for preserving human bodies and animal remains.

[0048]

As described above, according to the present invention, a state in which fresh water does not freeze at 0 ° C. or less is created by forming a predetermined alternating electric field in the refrigerator, and refrigeration can be performed in this state. . Thus, the food can be stored at a temperature of 0 ° C. or lower without freezing. In the present invention, for example, a state in which fresh water does not freeze in the range of -3 to 0 ° C can be created, so that various foods can be stored together at a lower temperature. In particular, in the present invention, foods that freeze and become severely damaged at 0 ° C. or less, such as vegetables, fruits, and cakes, can be stored without freezing at a temperature of 0 ° C. or less.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining a freezing point refrigerating device according to an embodiment of the present invention.

FIG. 2 is a diagram showing one detailed embodiment of a circuit diagram of the alternative potential supply device of the present invention.

FIG. 3 is a perspective view showing one embodiment of the appearance of the alternating potential supply device of the present invention.

FIG. 4 is a partial cross-sectional view showing a mode in which a replacement potential supply device is installed in a commercial refrigerator.

FIG. 5 is a partial cross-sectional view showing a mode in which a replacement potential supply device is installed in a prefabricated refrigerator.

FIG. 6 is a view showing an embodiment in which a metal shelf is insulated from an inner wall of a metal warehouse; FIG. 6 (1) is a partial sectional view;
FIG. 6B is a partial front view.

FIG. 7 is a perspective view for explaining one embodiment of a shelf board in the freezing point refrigeration apparatus of the present invention.

FIG. 8 is a partial cross-sectional view for explaining another mode of the shelf board in the freezing point refrigerator according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Inner wall of a warehouse 3 Insulation material 4 Outer wall 5 Insulation sheet 10 Metal shelf 11 Shelf support pillar 13 Shelf bracket 20 Alternating potential supply device 21 Transformer 22a Secondary pole 22b Secondary pole other pole 24 Capacitor 25 Resistance 26 Sliding back 27 Door switch

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Keiichiro Sugimura 31-2 Hachigata-cho, Kanazawa-ku, Yokohama-shi 605 Hakkei Heim 605 (72) Inventor Kei Keishita 1-2-1-8-505 Yanaka, Adachi-ku, Tokyo F-term (reference) 3L045 AA02 BA01 LA12 NA15

Claims (11)

[Claims] 1. A refrigeration apparatus comprising: a metal shelf electrically insulated from at least an inner wall of a refrigerator;
00V, and at a frequency of 10
By applying an alternating potential of 0 Hz to 50 Hz,
A freezing point refrigerating apparatus characterized by generating a predetermined alternating electric field in a refrigerator, creating a state in which fresh water does not freeze even at 0 ° C. or less by the predetermined alternating electric field, and performing refrigeration in this state. 2. The refrigerator according to claim 1, wherein an inner wall of the refrigerator is electrically insulated from at least an outer wall of the refrigerator main body, and at least an outer wall of the refrigerator main body is grounded to the ground. Only directly connected to the metal shelf electrically insulated from the inner wall of the refrigerator, the other pole on the secondary high voltage side of the transformer is connected to the outer wall via a capacitor and a resistor, An apparatus comprising an AC power supply connected to both ends of a primary low-voltage side, wherein the shelf is sufficient to generate a space potential of 200 V to 500 V in a space at a distance of 1 cm from an upper surface of the shelf, and By applying a alternating potential having a frequency of 100 Hz to 50 Hz, a predetermined alternating electric field is generated in the refrigerator, and a state in which fresh water does not freeze even at 0 ° C. or lower is created by the predetermined alternating electric field. Freezing point depression refrigeration apparatus which is characterized in that a. 3. The freezing point refrigeration system according to claim 1, wherein an alternating potential having a frequency of 100 Hz to 65 Hz is applied. 4. The freezing point refrigeration system according to claim 2, further comprising a frequency converter for converting a frequency on a secondary high voltage side of the transformer. 5. The freezing point refrigerating apparatus according to claim 1, wherein a through hole is provided on a surface of the shelf board. 6. The freezing point refrigeration apparatus according to claim 1, wherein a projection is provided on a surface of the shelf board. 7. The freezing point refrigeration system according to claim 1, further comprising a door switch for energizing / disconnecting an AC power supply on a primary low voltage side of the transformer according to opening and closing of the door. . 8. An alternating potential supply device used in a freezing point refrigeration device, comprising: means for supplying AC power to both ends of a primary low voltage side of a transformer; An output cord insulated with a secondary high-voltage line that is directly connected only to a metal shelf plate that is electrically insulated from the inner wall of the chamber, and a capacitor and And a ground terminal connected in this order through a resistor. 9. The alternating potential supply device for a freezing point refrigeration system according to claim 8, further comprising a slidac or a variable resistor for adjusting a potential at one pole on a secondary high voltage side of said transformer. 10. The alternate potential supply for a freezing point refrigeration system according to claim 8, further comprising a door switch for energizing / cutting off an AC power supply on a primary low voltage side of the transformer in accordance with opening and closing of the door. apparatus. 11. A frequency converter for converting a frequency on a secondary high voltage side of a transformer.
11. The alternating potential supply device for a freezing point refrigeration device according to any one of claims to 10.