JP6230154B2 - Defroster - Google Patents

Description

  The present invention relates to a thawing device that can defrost an object to a temperature expected in a short time.

  Foods such as fish and meat are sometimes stored frozen in a freezer for the purpose of maintaining quality. Frozen foods must be thawed later for sale or processing. Further, even non-food items may be stored at a low temperature, frozen and then thawed, defrosted at a low temperature of 0 ° C. or lower, and later stored in a refrigerated state.

  When the food is thawed, for example, by placing the food in an environment having a temperature higher than the temperature inside the food, the food is gradually thawed to the inside using heat transfer while raising the temperature from the surroundings. At this time, the thawing time can be shortened as the temperature of the environment in which the frozen food is placed increases. However, the higher the environmental temperature, the worse the quality of the thawed food. On the other hand, when quality degradation is taken into consideration, there is a problem that the environmental temperature needs to be lowered, and the time required for thawing becomes long. Depending on the situation, uneven thawing may occur. Further, when the thawing is insufficient or when the thawing fails, the subsequent processing such as processing may be difficult.

US Pat. No. 6,138,555

  As described above, sufficient research has not been made on thawing methods for thawing frozen foods or the like, or raising the temperature of a product cooled to a low temperature. Specifically, as described in Patent Document 1, although various researches have been conducted on storage and freezing methods, at present, the research on the thawing method is not sufficiently advanced, and the quality at the time of thawing May deteriorate or the thawing time may be long.

  In view of the above problems, an object of the present invention is to provide a thawing device capable of thawing or raising the temperature of a product that has been frozen or cooled to a low temperature while maintaining the quality.

In order to achieve the above object, the present invention provides a storage chamber for storing an object to be thawed , a pair of electrodes including a discharge electrode and a ground electrode arranged with the object sandwiched therebetween, and an object between the electrodes. An electrode control device that controls application of a voltage for thawing, a sensor that measures the temperature of the object, and a temperature in the storage chamber that is higher than the target thawing temperature for thawing the object at the start of thawing of the object The initial control for controlling to a predetermined initial temperature is executed, and at the timing when the temperature of the object obtained from the value measured by the sensor changes from a sudden rise to a gentle rise, the control target temperature in the storage chamber is set to the switching from the initial temperature to the thawing target temperature, and a temperature controller value to be to perform a first temperature control for controlling the temperature of the storage chamber to reach the decompression target temperature measured by the sensor And wherein the door.

  ADVANTAGE OF THE INVENTION According to this invention, the thawing | decompression apparatus which maintains the quality of the frozen target object and defrosts in a short time can be obtained.

It is the schematic of the decompression | decompression apparatus which concerns on 1st Embodiment. It is an example of the graph which shows the temperature change of the target object thawed | decompressed with the thawing | decompression apparatus of FIG. It is an example of the electrode utilized with the decompression | decompression apparatus of FIG. It is a figure explaining the specific example of the temperature control of the thawing | decompression apparatus of FIG. It is an example of the shape of the discharge electrode needle | hook utilized with the thawing | decompression apparatus of FIG. It is the schematic of the decompression | decompression apparatus which concerns on 2nd Embodiment. It is the schematic of the decompression | decompression apparatus which concerns on 3rd Embodiment. It is the schematic of the decompression | decompression apparatus which concerns on 4th Embodiment. It is a flowchart explaining the waste_water | drain in the thawing | decompression apparatus of FIG. It is the schematic of the decompression | decompression apparatus which concerns on 5th Embodiment. It is the schematic of the thawing | decompression apparatus which concerns on a 1st modification. It is the schematic of the thawing | decompression apparatus which concerns on a 2nd modification. It is the schematic of the thawing | decompression apparatus which concerns on a 3rd modification and a 4th modification.

  Below, the decompression | decompression apparatus which concerns on embodiment of this invention is demonstrated. The thawing device according to the embodiment is a device that thaws a frozen object such as frozen food at a low temperature of 0 ° C. or lower, or later stores it in a refrigerated state. In the following embodiments, the same components are denoted by the same reference numerals and description thereof is omitted.

  Here, the object is described as food such as fish and meat, but the object is not limited to food. For example, as an example of an object to be thawed at a low temperature of 0 ° C. or lower by the thawing device according to the embodiment or later stored in a refrigerated state, artificial fertilized embryos of humans and livestock, differentiated cells, microorganisms for bioreactors, Examples include superconductor equipment.

<First Embodiment>
As shown in FIG. 1, a thawing device 1A according to the first embodiment includes a storage chamber 10 that stores an object X to be thawed, a temperature control device 11 that controls the temperature in the storage chamber 10 to a predetermined temperature, A support portion 12 that supports the object X so as to be positioned higher than the floor surface of the storage chamber 10, an electrode 13a provided on the ceiling of the storage chamber 10 that generates an electric field at the position where the object X is disposed, and a support portion 12, an electrode 13 b that generates an electric field at an arrangement position of the object X, a discharge electrode needle 13 c that is provided in the electrode 13 a and emits charged particles, and controls the electrodes 13 a, 13 b and the discharge electrode needle 13 c. An electrode control device 14 is provided. Further, the thawing device 1A includes a first temperature sensor 11a that measures the surface temperature of the object X and a second temperature sensor 11b that measures the temperature in the storage chamber 10. FIG. 1 is a schematic side view of the thawing device 1A.

  In the thawing device 1A, when the object X is thawed, the temperature control device 11 appropriately controls the temperature in the storage chamber 10 according to the type, size, surface temperature, and the like of the object X. In the thawing device 1A, energy is supplied from the electrode to reduce the temperature of the object to be thawed during thawing (the amount of heat required for phase conversion of ice, the heat of ice melting, the heat of evaporation of the object X, the heat of sublimation of the object X, etc.) The electrical energy and the energy held by the atmosphere in the storage chamber 10 can accelerate the thawing of the object X, and shorten the thawing time.

  Further, in the thawing device 1A, when electric energy is applied to the electrodes 13a and 13b, an electric field is generated in the object X, and an electric current is generated in the object placed in the electric field to generate Joule heat. The object X is thawed by the Joule heat. In the portion where the electric field of the object X is generated, dielectric loss due to the relative permittivity also occurs. In addition, in the thawing device 1A, when electric energy is applied to the discharge electrode needle 13c, charged particles are generated and radiated to the surface of the object X, thereby promoting thawing from the surface of the object X.

  The object X is thawed from the inside and the surface by the electric energy (joule heat, dielectric loss, charged particles) generated by these. Therefore, in the thawing device 1A, using only the general ambient temperature, thawing, in comparison with the method of thawing only by Joule heat and the method of thawing while increasing the temperature by heat transfer from the surroundings in a short time, Thawing to a predetermined temperature in the storage chamber 10 can be performed uniformly and efficiently.

≪Storage room≫
In the storage chamber 10, the object X is stored inside during thawing. The storage chamber 10 has a door (not shown) that is opened when the object X is carried in or out, and is closed when the object X is defrosted, and is preferably sealed when defrosting.

  The size of the storage chamber 10 is not limited and is set according to the purpose. For example, when used in a factory or a market, the storage room 10 is stored in a storage container such as a refrigeration apparatus or a refrigeration apparatus, or a plurality of block-shaped objects X that are frozen are used as containers, carts, or the like. It may be formed in a large size so that it can be defrosted while being carried in and placed on a carriage. Further, when used in a home, a restaurant, or the like, the storage room 10 may be formed in a small size in which only the object X can be put.

  Moreover, it is preferable that the inside of the storage chamber 10, specifically, the inner side surface, the ceiling, and the floor are formed of an insulator so that unnecessary discharge does not occur. Furthermore, the inner side surface of the storage chamber 10 is preferably made of a material that easily flows down when water vapor is attached.

≪Temperature control device≫
The temperature control device 11 controls the temperature in the storage chamber 10. Specifically, the temperature control device 11 performs initial control so that the temperature in the storage chamber 10 becomes a temperature that promotes the thawing of the object X at the start of the thawing of the object X. When the change of the temperature characteristic of the target object X reaches the first condition, the temperature control device 11 is the temperature at which the temperature in the storage chamber 10 is set by the initial control until the temperature of the target object X reaches the third condition. The first temperature control is performed so that the thawing temperature is lower. When the temperature of the object X reaches the third condition, the temperature control device 11 executes the second temperature control so that the temperature in the storage chamber 10 becomes equal to or lower than a predetermined temperature that degrades the quality of the thawed material X.

  For example, when the temperature in the storage chamber 10 is high, in addition to the object X being thawed by Joule heat or charged particles, the temperature is increased from the periphery of the object to the inside by the temperature around the object X, and defrosting is performed. Promoted. However, when the ambient temperature is high and the thawing from the surroundings to the inside progresses rapidly, the quality of the object X deteriorates due to thawing unevenness or cell destruction. Therefore, in the thawing device 1A, the conditions and the control program of the temperature control device 11 are set so that the object X is not defrosted by the ambient temperature beyond the allowable temperature of the object X, and the temperature in the storage chamber 10 is controlled. .

  For example, the temperature control device 11 controls the temperature of the storage chamber 10 so that the temperature changes between −5 ° C. and 0 ° C. The temperature of the storage chamber 10 is determined based on, for example, a temperature at which the object X can be easily processed. Specifically, when the object X is sold in a fillet state such as a tuna or salmon, the temperature control device 11 allows the object X to be thawed to a temperature at which the object X can be easily cut. Control the temperature. Moreover, it is preferable that the temperature control apparatus 11 can control the temperature in the storage chamber 10 in order to maintain the quality of the object X after thawing.

  The optimum temperature for thawing may differ depending on the type, size, and target thawing time of the object X. Therefore, the temperature control device 11 can adjust the surface temperature of the object X by adjusting the temperature in the storage chamber 10 according to the type of the object X to be thawed and the desired thawing time.

  Here, water, various saturated fatty acids, various unsaturated fatty acids and the like constituting foods have different freezing temperatures (melting points). Moreover, the ratio of a structure changes with kinds of foodstuff. Therefore, the temperature control by the temperature control device 11 is preferably executed according to food. For example, in the case of fish, depending on the type of fish, the water content is 60% to 86% (standard 71% to 79%) and the lipid content is 0.5% to 20% (standard 1% to 6%). include. On the other hand, the content of unsaturated fatty acids varies depending on the type of fish, and is said to contain 78% saury, 66% red tuna, 71% tin and 67% sawara.

  When the melting point of the main fatty acid in the case of saury is shown, it is palmitic sun (63 ° C.) and stearic acid (69.9 ° C.) which are saturated fatty acids. On the other hand, unsaturated fatty acids are docosenoic acid (33.8 ° C.), icosenoic acid (23 ° C. to 24 ° C.), oleic acid (13.4 ° C.), and palmitoleic acid (−0.1 ° C.). However, polyvalent ones are docosahexaenoic acid (DHA) (−44 ° C.), icosapentaenoic acid (−54 ° C.), linoleic acid (−5 ° C.), and linolenic acid (−11 ° C.).

  Thus, for example, since the melting point of polyunsaturated fatty acids contained in fish saury is 0 ° C. or lower, when thawing from the freezing temperature, the polyunsaturated fatty acids are first dissolved and then Moisture and saturated fatty acids are thawed.

  On the other hand, in the case of meat, the melting point is 40 ° C. to 56 ° C. for cattle, 28 ° C. to 48 ° C. for pigs, and 25 ° C. to 36 ° C. for dairy butter. After that, the various fats inside are thawed.

  Therefore, when performing higher-quality thawing, as described above, when the object X is a food, it is used for temperature control depending on the type of food and, if necessary, the composition of the food. It is preferable to set conditions and a control program and defrost the object X.

  For example, when the object X is a fish, the unsaturated fatty acid inside the fish melts before the ice melts. Therefore, in consideration of not only thawing of fish but also processing of fish, it is desirable that the inside of the fish be thawed by Joule heat or the like by the electrodes 13a and 13b, while the surface is frozen and the hardness suitable for processing is maintained. . Specifically, when thawing for the purpose of making a fish that is an object to fillet, it is desirable that the temperature control device 11 controls the atmospheric temperature in the storage chamber 10 to the melting temperature of each food.

  The thawing device 1A applies electric energy to the electrodes 13a, 13b and the discharge electrode needle 13c to defrost the object X with charged particles and an electric field, and targets the ambient temperature in the storage chamber 10 using the temperature control device 11. It is set higher than the surface temperature of the object X, and thawing can be promoted by heat transfer energy from the atmosphere. On the other hand, the phase change, heat of fusion, heat of sublimation, and heat of evaporation of the ice in the object X serve to lower the temperature of the object. Therefore, the temperature rise of the object X is moderate when the temperature rise due to the given energy balances the action of lowering the ice phase change, heat of fusion, sublimation and heat of evaporation. Thereafter, the melting of the ice in the object X is almost finished, and the evaporation from the surface of the object X is performed when the vapor pressure inside the object X and the saturated vapor pressure in the storage chamber 10 are balanced or close to each other. The evaporation from the object X decreases, and the temperature of the object X increases again.

  In addition, after the object X is thawed by Joule heat by the electrodes 13a and 13b, radiation of charged particles by the discharge electrode needle 13c, and an increase in the temperature of the atmosphere in the storage chamber 10, the temperature controller 11 determines the quality of the thawed product. It is preferable that the atmospheric temperature in the storage chamber 10 can be variably controlled in a cold temperature zone (for example, −3 ° C. to + 5 ° C.). As described above, this temperature is set to a temperature at which the quality of the object X can be maintained in accordance with the property of the object X.

  FIG. 2 is a graph showing a change in temperature of the object X during thawing. Here, FIG. 2A is a schematic diagram for explaining an example of temperature control by the temperature control device 11, and FIG. 2B is a temperature measurement value in an experiment. In FIG. 2, the horizontal axis represents time and the vertical axis represents temperature.

  As shown in FIG. 2A, in the thawing device 1A, when the temperature control device 11 starts thawing in a state where the temperature in the storage chamber 10 is controlled by “initial control”, the “first condition” is reached from t0. At t1, thawing of the object X is promoted by the electric field and charged particles generated by the electric energy in the electrodes 13a and 13b and the discharge electrode needle 13c and the heat transfer energy from the atmosphere, and the temperature of the object X becomes h0 to h1. Change.

  “Initial control” is control in which the inside of the storage chamber 10 is set to a temperature that promotes thawing of the object X. Specifically, the temperature in the storage chamber 10 is controlled to be equal to or lower than a predetermined temperature at which the quality of the object X is less likely to deteriorate, for example, the temperature of the object X is higher than the melting point of the object X and bacteria hardly grow on the object X. Since the temperature at which quality deteriorates differs depending on the object X, the temperature set in this initial control differs depending on the type of the object X. Further, the “first condition” is a timing at which the temperature characteristic of the object X changes, and specifically, a timing at which the temperature of the object X that has rapidly increased changes so as to gradually increase. It is. In this “initial control”, thawing of the object X is promoted.

  As shown in FIG. 2A, in the thawing device 1A, the temperature control device 11 executes “first temperature control” at t2 that reaches the “second condition” from t1, and the temperature of the object X is The temperature rises gradually from h1 to h2 due to the temperature rise caused by the applied energy and the action of lowering the temperature of ice phase change, heat of fusion, sublimation and heat of evaporation.

  The “second condition” is a timing at which the temperature of the object X reaches the target temperature h2 for thawing of the object X. Further, the “first temperature control” is control for setting the inside of the storage chamber 10 to a target temperature for thawing the object X.

  In this way, by controlling the inside of the storage chamber 10 to the target temperature when the second condition is reached, that is, until the object X reaches the target temperature, the object X is prevented from being thawed higher than the target temperature. The deterioration of the quality of the object can be prevented. The target temperature may be the melting point of the object X, or may be a temperature that is easy to process when the object X is thawed for the purpose of processing it into a fillet or the like. For example, when the object X is saury and 0 ° C. is the melting point, the melting point of 0 ° C. may be set as the target temperature. When the temperature suitable for cooking and processing is −2 ° C., −2 ° C. may be set as the target temperature in consideration of cooking and processing.

  Thereafter, the temperature control device executes “second temperature control” when the “third condition” is reached. Specifically, when time elapses until t3 and the temperature of the object reaches a predetermined temperature h3, the action of lowering the temperature of ice phase change, heat of fusion, sublimation, and heat of evaporation is reduced. As shown in a), after the temperature of the object X reaches h3, there is a risk of sudden increase from h3. Moreover, when the temperature of the target object X rises rapidly, the quality will deteriorate. Therefore, the “second temperature control” is control for maintaining the temperature in the storage chamber 10 at a temperature at which the quality of the object X does not deteriorate. Even in the second temperature control, for example, the target temperature used in the first temperature control may be controlled.

  Here, the “third condition” may be a timing at which the temperature of the object X reaches h3 at which the temperature rapidly increases. In this case, in the example shown in FIG. 2A, the second temperature control is executed after t3. By controlling the temperature in the storage chamber 10 when the temperature of the object X reaches h3, it is possible to prevent a rapid increase in the temperature of the object X and prevent deterioration of the quality of the object X from an early stage. it can.

  Alternatively, the timing at which the temperature of the object X reaches the target temperature h2 may be set as the “third condition”. In this case, in the example shown in FIG. 2A, the second temperature control is executed after t2. As described above, by executing the second temperature control immediately after the first temperature control, it is possible to prevent deterioration of the quality of the object X from an early stage.

  In addition, the timing at which the temperature of the object X reaches a predetermined temperature set in h2 to h3 may be set as the “third condition”.

  In the second temperature control, the temperature control device 11 can control the temperature in the storage chamber 10 to be lowered to a predetermined temperature or less. In addition, when the electrodes 13a and 13b are applied, the temperature control device 11 controls the electrode control device 14 to interrupt the voltage application or reduce the voltage to be applied. It is also possible to control the temperature to be a predetermined temperature or lower (for example, + 5 ° C. or lower).

  In the temperature control shown in FIG. 2A, the temperature of the object X is linearly controlled in the initial control and the first temperature control, respectively, but the temperature may be lowered stepwise.

  FIG. 2B is a graph obtained by measuring the temperature when an object X is thawed at 18 kV and when thawed at 0 kV. For example, first, the temperature control device 11 performs “initial control”. When this “initial control” is executed, in the thawing device 1A, when the energy supplied from the electrodes 13a, 13b and the discharge electrode needle 13c is large and the specific heat is small, the temperature of the object X rises.

  Thereafter, the timing at which the “first condition” is reached due to the influence of the temperature in the storage chamber 10 due to the thawing of the object X and the evaporation of ice from the object X, specifically, the temperature of the object X increases. When detecting a gradual timing (time A in FIG. 2B), the temperature control device 11 is used as a timing to change the control of the temperature in the storage chamber 10 from “initial control” to “first control”. can do. The timing A may also be used for controlling the electrodes 13a and 13b and the discharge electrode needle 13c by the electrode control device 14.

  Subsequently, when the timing at which the “second condition” is reached, specifically, the timing at which the temperature of the object X reaches the target temperature (time B in FIG. 2B) is detected, the temperature control device 11. Ends the “first temperature control” for setting the target object X to the target temperature in the storage chamber 10. This timing B may also be used for controlling the electrodes 13a and 13b and the discharge electrode needle 13c by the electrode control device 14.

  Thereafter, at the timing of reaching the “third condition” (the point at which the temperature rise of the object becomes intense, or the point at which a predetermined temperature (for example, 5 ° C.) has been reached (point C in FIG. 2B)) The temperature control device 11 executes “second temperature control” for setting the inside of the storage chamber 10 to a predetermined temperature. For example, the temperature control device 11 lowers the ambient temperature in the storage chamber 10 or transmits a signal to the electrode control device 14 to reduce or interrupt the applied voltage.

Other Temperature Control Examples In the example described above with reference to FIG. 2A, the second control is executed when the third condition is reached after the first control, but the first control is described. Instead of ending when the second condition is reached, it may be continued until the object X is taken out from the thawing apparatus 1A, and the temperature of the storage chamber 10 may be controlled to the target temperature.

  Moreover, in the example mentioned above, since the temperature of the object X is sufficiently lower than the target temperature to be thawed (for example, a difference of about 20 ° C.), the temperature in the storage chamber 10 is once higher than the target temperature in the initial control. Subsequently, an example in which the first control is switched at the timing when the first condition is reached has been described. On the other hand, when the temperature of the object X is close to the target temperature to be thawed (for example, a difference of about 5 ° C.), the first control may be executed from the initial stage without executing the initial control.

  Further, when the temperature of the object X is lower than the target temperature to be thawed (for example, a difference of 40 ° C. or more), the initial control may be divided into two stages. For example, when the target temperature for thawing the object X at −60 ° C. is set to 0 ° C., the inside of the storage chamber 10 is first set to 10 ° C., and the temperature of the object X is changed to −20 ° C. Thereafter, the inside of the storage chamber 10 may be set to 5 ° C., the temperature of the object may be changed to about −5 ° C., and the first temperature control may be performed.

  Note that the water flow temperature and natural thawing temperature in the case of running water thawing and natural thawing are, for example, 25 ° C.

Example of Temperature Control Using Heat Exchanger FIG. 4A is a specific example when a heat exchanger is used as the temperature control device 11. As shown to Fig.4 (a), the temperature control apparatus 11 which is a heat exchanger sends warm air to the storage chamber 10 according to temperature control. For example, when it is necessary to raise the temperature, the heat exchanger 11 takes in outside air supplied from the outside of the heat exchanger 11 or exhaust heat from other heat engines (not shown), and stores warm air therefrom. Send to room 10. Moreover, the heat exchanger 11 takes in the cold air in the storage chamber 10, warms it, and sends it again into the storage chamber 10. At this time, the heat exchanger has a function of taking moisture from the air put into the storage chamber 10, and after taking moisture from the cold air taken from the storage chamber 10, warm air is put into the storage chamber 10. Insert.

-Example of temperature control using convection FIG. 4B is an example in the case of using convection of heat generated by the temperature control device 11 using a heat source. As shown in FIG. 4B, as a means for increasing the temperature in the storage chamber 10, the storage chamber 10 has a heat source 11c controlled by the temperature control device 11, and thereby, the storage chamber 10 is effectively The temperature may be increased. Examples of the heat source 11c include a heat transfer coil and an electric lamp. For example, when electric light is used as the heat source 11c, the interior of the storage chamber 10 can be brightened by illuminating the object X with light in addition to increasing the temperature in the storage chamber 10. The temperature control device 11 can have a plurality of such heat sources 11c. By adjusting the number of heat sources 11c to be used among the plurality of heat sources 11c, it is possible to perform fine adjustment of temperature control in the storage chamber 10.

  As shown in FIG. 4B, the thawing apparatus 1A has a heat source 11d and a fan 11e controlled by the temperature control device 11 in the storage chamber 10, thereby effectively increasing the temperature of the storage chamber 10. May be raised. In the storage chamber 10, the heat generated by the heat source 11 d is agitated by the rotation of the fan 11 e, and convection is generated by a high temperature upward flow and a low temperature downward flow to make the temperature in the storage chamber 10 uniform. The temperature rise with respect to the surface of the object X can be made uniform. The temperature control device 11 can have a plurality of such heat sources 11d and fans 11e. By adjusting the number of heat sources 11d and fans 11e to be used among the plurality of heat sources 11d and fans 11e, it is possible to finely control the temperature in the storage chamber 10.

  Furthermore, as shown in FIG. 4B, the thawing device 1A can include a guide 11f in the storage chamber 10 in addition to the heat source 11d and the fan 11e. This guide 11f can control the flow of agitation of air by the operation of the heat source 11d and the fan 11e. Thereby, for example, warm air generated by the heat source 11e rises by the fan 11e, and after directly hitting the object X to become cool air, it can be assisted to move again to the positions of the heat source 11d and the fan 11e. Therefore, by effectively arranging the guide 11f inside the storage chamber 10, the air flow in the storage chamber 10 can be freely operated.

≪First temperature sensor≫
The first temperature sensor 11a measures the surface temperature of the object X. The first temperature sensor 11a may be an infrared sensor, or may be a sensor that measures by directly contacting the object X. Further, the measurement of the object X may be performed by measuring a place considered to represent the entire temperature, or by measuring a plurality of places and using the average as the surface temperature of the object X. When measuring a plurality of locations and taking the average as the surface temperature of the object X, the first temperature sensor 11a is composed of a plurality of sensors, and the thawing device 1A is a measuring device (not shown) connected to each sensor. The average of the temperatures obtained by each sensor is calculated by the measuring device, and the average value is set as the surface temperature of the object X. In addition to the average temperature, the maximum and minimum temperatures can be measured to confirm that no temperature unevenness has occurred, and measures are taken to prevent temperature unevenness.

≪Second temperature sensor≫
The second temperature sensor 11b measures the temperature in the storage chamber 10. Any temperature sensor that can measure the temperature of the atmosphere in the storage chamber 10 may be used. In addition, when the temperature of the atmosphere in the storage chamber 10 is biased depending on the position, a fan can be attached in the storage chamber 10 to measure an appropriate average temperature in the storage chamber 10. This fan may be shared with the above-described fan 11e.

≪Electrode≫
As shown in FIG. 1, the thawing apparatus 1A includes a pair of electrodes 13a and 13b, one being a discharge electrode and the other being a ground electrode. Here, the electrode 13a disposed on the ceiling side may be a plate electrode, but the electrode 13b disposed on the floor side is preferably not a plate electrode. FIG. 3 is a top view for explaining an example of the shape of the electrode 13b. The electrode 13b shown in FIG. 3A is an example of an electrode formed by arranging a plurality of electrode lines 131 in parallel in the same direction. Moreover, the electrode 13b shown in FIG.3 (b) is an example of the electrode formed by arrange | positioning in a grid | lattice form so that the electrode line 131 may cross | intersect. Further, the electrode 13b may have a net shape other than the lattice shown in FIG. The size of the electrode 13b is preferably set according to the object X, a container in which the object X is stored, and the like.

  If the electrode 13b is a plate-like electrode, moisture generated from water vapor in the air in the object X or the storage chamber 10 during thawing may accumulate on the electrode, which may promote electrode deterioration. On the other hand, by using an electrode as shown in FIG. 3 instead of the plate-like electrode, moisture generated from the object X at the time of thawing can fall as water droplets on the floor of the storage chamber 10. Therefore, it is possible to reduce the deterioration of the electrode 13b due to moisture accumulated on the electrode 13b and the flow of electricity that may be generated through the moisture. In such a case, if the support portion 12 that supports the electrode 13b is plate-shaped, moisture will accumulate in the support portion 12. Therefore, it is preferable that the support portion 12 has a configuration that allows water flowing from the electrode 13b to drop.

  When the electrodes 13a and 13b generate an electric field, ozone is generated. Specifically, due to the discharge, oxygen in the air is activated and chemically changed to ozone. The ozone thus generated can deodorize and sterilize the inside of the storage chamber 10. In addition, sterilization with ozone suppresses the proliferation and decay of the target X. The electrodes 13a and 13b may have a dielectric (not shown) on the side where the object X is disposed. Thereby, an electrode can be protected from the salt content contained in the target object X and the ozone which generate | occur | produces.

≪Discharge electrode needle≫
For example, as shown in FIG. 1, the discharge electrode needle 13c is arranged perpendicular to the electrode 13a. The shape of the discharge electrode needle 13c may be any shape as long as it generates charged particles. However, in order to avoid risks such as creeping discharge and increase energy efficiency, it is preferable to make the tip for generating charged particles an acute angle. For example, it may be a rod with a sharp tip as shown in FIG. In this case, processing is also easy. Moreover, the rod-shaped thing which the front-end | tip is broken into plurality like FIG.5 (b) may be sufficient. In this case, the effect of promoting the emission of charged particles from a plurality of sharp tips is high. Moreover, even if it is a shape like FIG.5 (c), a charged particle will generate | occur | produce from each pointed-shaped location.

  When the discharge electrode needle 13c generates charged particles, ozone is generated. The ozone generated in this manner can deodorize and sterilize the inside of the storage chamber 10, and can also suppress the growth and decay of bacteria of the object X. When the amount of ozone generated only by the discharge electrode needle 13c and the electrodes 13a and 13b is not sufficient, an electrode for generating ozone may be provided on the side surface in the storage chamber 10 or the like.

  In addition, the discharge electrode needle 13c may be provided with a protrusion that is symmetrical with respect to the central axis of the discharge electrode needle 13c. Thereby, it is possible to reduce or prevent the occurrence of light and shade in the ions generated by the discharge electrode needle 13c, and to reduce the generation of ion wind.

  Furthermore, a movement function (not shown) for moving the position of the discharge electrode needle 13c up and down or left and right can be provided. The distance between the discharge electrode needle 13c and the object to be thawed can be adjusted by moving the position of the discharge electrode needle 13c up and down or left and right. As a result, the possibility of ion wind generation can be further reduced or prevented.

  Further, the thawing device 1A can include a plurality of discharge electrode needles 13c as shown in FIG. In this case, it is necessary to appropriately adjust the number and voltage of the discharge electrode needles 13c in order to thaw the target product. Generally, when the discharge electrode needle 13c is installed, there is an effect that the voltage can be lowered. Also, the space between the discharge electrode needle 13c installed on the ceiling and the object X evaporates from the object X. The distance is set to such an extent that the water droplets can be formed when the water falls through the discharge electrode needle 13c. Thereby, when the evaporated water falls through the discharge electrode needle 13c installed on the ceiling, the water droplet becomes a water flow, and it can be prevented from discharging through the water flow. In addition, by reducing the number of discharge electrode needles 13c and providing a fixed interval between the discharge electrode needles 13c and the discharge electrode needles 13c, it is possible to reduce water droplets accumulated between the discharge electrode needles 13c.

  The voltage applied to the electrodes 13a, 13b and the discharge electrode needle 13c by the electrode control device 14 is mainly an alternating voltage, and can be a direct current. In the case of direct current, air that is an insulator exists between the electrodes 13a and 13b, and when discharging from the discharge electrode needle 13c, the flow of electrons and ions is unidirectional, and the heat exchange of charged particles is low. An alternating current that is easy to discharge even at a voltage is desirable.

≪Electrode control device≫
The electrode control device 14 applies a voltage to the electrodes 13a and 13b and the discharge electrode needle 13c, and controls the electrodes 13a and 13b to generate an electric field, with the flowing current value being a current value necessary for melting the object X. . At this time, since the optimum voltage and frequency differ depending on the object X, the electrode control device 14 controls the electrodes 13a and 13b and the discharge electrode needle 13c according to the voltage and frequency according to the condition of the object X. For example, in the case of salmon, the discharge electric field of the atmosphere is preferably several kV / m, and in the case of tuna, the voltage is preferably higher than that of salmon. In normal small-scale thawing, it is preferable to use the conductive material in a voltage range in which a conductive path through which a current flows does not occur.

  In addition, the electrode control device 14 applies the electrodes 13a and 13b at a voltage equal to or lower than a voltage that does not cause a spark discharge corresponding to the electrode control device 14. In addition, when the object X is thawed, the electrode control device 14 stops applying voltage to the electrodes 13a and 13b and the discharge electrode needle 13c. For example, when the electrode controller 14 detects that the surface of the object X has been thawed by the first temperature sensor 11a, the electrode controller 14 stops applying the voltage to the electrodes 13a and 13b and the discharge electrode needle 13c.

≪Support part≫
The support part 12 has a strength sufficient to support the weight of the electrode 13b and the object X. Moreover, it is preferable that the support part 12 is formed with an insulator so that unnecessary discharge does not occur.

As described above, in the thawing device 1A according to the first embodiment, the object X is thawed from the inside and the surface by the effective use of electric energy and heat exchange energy. Therefore, in the thawing apparatus 1A, only a general ambient temperature is used, and it is uniform in a short time compared with a method of thawing only by Joule heat or a method of thawing while increasing the temperature from the surrounding to the inside by heat transfer. And it can be thawed | decompressed to the predetermined | prescribed temperature in the storage chamber 10 efficiently.
In particular, when the size of the object X is not sufficiently small with respect to the capacity of the storage chamber 10, the interior of the storage chamber 10 is less likely to increase at the temperature of the object X when the low-temperature object X is thawed. The time required for thawing tends to be longer. Even in such a case, the thawing time can be shortened.

[Second Embodiment]
As shown in FIG. 6, in the thawing device 1B according to the second embodiment, compared to the thawing device 1A according to the first embodiment described above with reference to FIG. It differs in that it has an electrode needle 13c and a mounting table 12a on which the object X is placed so as not to contact the discharge electrode needle 13c on the electrode 13b and the discharge electrode needle 13c. FIG. 6 is a schematic side view of the thawing device 1B.

  The mounting table 12a can reduce the contact area with the object X so that a large amount of charged particles emitted from the discharge electrode needles 13c provided on the electrode 13b below the mounting table 12a can be emitted to the object X. preferable. However, when the target object X is not a single object but a plurality of small objects, it is necessary to form the object X in a mesh shape that can prevent these objects from falling. For example, a mesh shape can be considered.

  The thawing device 1B according to the second embodiment includes the discharge electrode needle 13c on the electrode 13b on the lower surface of the target object X in addition to the ceiling of the storage chamber 10 that is the upper surface of the target object X. Since the charged particles are almost uniformly bathed on the upper surface and the lower surface, the entire surface of the object X can be thawed uniformly. Specifically, in the case of the thawing device 1A according to the first embodiment, the upper surface of the object X is defrosted by charged particles, while the lower surface of the object X is defrosted by the electrode 13b that directly contacts the object X. There is a possibility that the lower part of the object X is first thawed. On the other hand, in the thawing device 1B according to the second embodiment, this is not the case, and the entire surface of the object X is uniformly thawed.

  In the thawing device 1B according to the second embodiment, as in the thawing device 1A according to the first embodiment, only the general ambient temperature is used, and only the Joule heat is used by the effective use of electric energy and heat exchange energy. Compared to the method of thawing and the method of thawing while raising the temperature by heat transfer from the surroundings to the inside, the thawing can be performed to a predetermined temperature in the storage chamber 10 in a short time uniformly and efficiently.

[Third embodiment]
As shown in FIG. 7, in the thawing device 1C according to the third embodiment, the electrode 13a on the ceiling of the storage chamber 10 is a discharge electrode compared to the thawing device 1A according to the first embodiment described above with reference to FIG. The electrode 13b supported by the support portion 12 without the needle 13c has the discharge electrode needle 13c, and the object X is placed on the electrode 13b and the discharge electrode needle 13c so as not to contact the discharge electrode needle 13c. It differs in having a mounting table 12a. FIG. 7 is a schematic side view of the thawing device 1C.

  The thawing device 1C according to the third embodiment can defrost the object X by having the discharge electrode needle 13c that can generate an electric field from below and be exposed to charged particles. Further, since the discharge electrode needle 13c is not provided on the ceiling of the storage chamber 10, moisture and water droplets generated in the thawing process become a water flow along the discharge electrode needle 13c, and no discharge is generated through the water flow. Therefore, the thawing device 1C is suitable for a case where the space between the ceiling of the storage chamber 10 and the object X is narrow and the discharge electrode needle 13c is provided on the ceiling of the storage chamber 10 and the discharge possibility is high due to water droplets. Yes.

  Similarly to the thawing device 1A according to the first embodiment, the thawing device 1C according to the third embodiment uses only the general ambient temperature by using the electric energy and the heat exchange energy, and only the Joule heat. Compared to the method of thawing and the method of thawing while raising the temperature by heat transfer from the surroundings to the inside, the thawing can be performed to a predetermined temperature in the storage chamber 10 in a short time uniformly and efficiently.

[Fourth Embodiment]
As illustrated in FIG. 8, the thawing device 1D according to the fourth embodiment has the support portion 12 on the floor surface of the storage chamber 10 as compared with the thawing device 1A according to the first embodiment described above with reference to FIG. 1. The difference is that a water tank 15 is provided below.

  When the object X is thawed, a small amount of moisture is generated from the object X and may fall. Some objects X include a large amount of ice. For example, when the object X is a frozen food and a large amount of ice that cools it, the temperature of the ice contained in the object X is controlled by the temperature control device 11 and an electric field is generated by the electrodes 13a and 13b. When generated, it melts into a large amount of water and falls. The water tank 15 stores the water generated during thawing as described above.

  Here, when the water stored in the water tank 15 is discharged into the sewage through a discharge port (not shown), it is necessary to prevent a conductive path from being generated through the water. For example, when moisture flows continuously from the water tank 15 to the sewage while applying a voltage to the electrodes 13a and 13b, there is a possibility that an electric flow from the thawing device 1D to the sewage occurs. Therefore, for example, by a process as shown in FIG. 9, drainage is performed so that a conductive path is not generated from the thawing device 1D to the sewage.

  FIG. 9A is a flowchart for explaining processing when the amount of water generated from the object X is a small amount that can be sufficiently stored in the water tank 15. First, after the object X is carried into the thawing device 1D, the electrode control device 14 applies the voltages of the electrodes 13a and 13b and the discharge electrode needle 13c (ST01). Thereafter, the outlet is closed until the object is thawed, and the dropped water is accumulated in the water tank.

  When the thawing is completed (YES in ST02), the electrode control device 14 stops applying the voltage to the electrodes 13a and 13b and the discharge electrode needle 13c (ST03). After this, since no conductive path is generated, the discharge port is opened and the water in the water tank 15 is drained into the sewage (ST04).

  On the other hand, FIG. 9B is a flowchart illustrating a process in the case where a large amount of water is generated at the time of thawing and the water cannot be stored in the water tank 15 when the object X contains a large amount of ice. First, the object X is carried into the thawing device 1D, and the electrode control device 14 applies a voltage to the electrodes 13a and 13b and the discharge electrode needle 13c (ST11).

  Thereafter, when the water level in the water tank 15 becomes equal to or higher than the threshold value by a water level gauge (not shown) (ST12), the electrode control device 14 stops applying the voltage to the electrodes 13a and 13b and the discharge electrode needle 13c (ST13). ). Thereby, since a conductive path does not occur, the discharge port is opened, and the water in the water tank 15 is drained into the sewage (ST14).

  If the thawing of the object X is not completed after the drainage is completed (NO in ST15), the processes in steps ST11 to ST15 are repeated until the thawing is completed.

  In the thawing device 1D according to the fourth embodiment, by installing a water tank 15 made of an insulator on the floor of the storage chamber 10, a water tank is applied while voltage is applied to the electrodes 13a and 13b and the discharge electrode needle 13c. Water generated by thawing is stored in 15 and the application of voltage to the electrodes 13a and 13b and the discharge electrode needle 13c is stopped, and then drained from the water tank 15. Thereby, while applying a voltage to the electrodes 13a and 13b and the discharge electrode needle 13c, it is possible to prevent a conductive path from being generated in the sewage through the drainage. In addition, it is possible to prevent electrolytic corrosion or the like around the thawing device by preventing the conductive path from being generated in the sewage through the water drained from the thawing device 1D.

  In the thawing device 1D according to the fourth embodiment, as in the thawing device 1A according to the first embodiment, only the general ambient temperature is used and only the Joule heat is used by the effective use of electric energy and heat exchange energy. Compared to the method of thawing and the method of thawing while raising the temperature by heat transfer from the surroundings to the inside, the thawing can be performed to a predetermined temperature in the storage chamber 10 in a short time uniformly and efficiently.

[Fifth Embodiment]
As shown in FIG. 10, the thawing device 1E according to the fifth embodiment is between the ceiling of the storage chamber 10 and the electrode 13a as compared with the thawing device 1A according to the first embodiment described above with reference to FIG. It differs in the point provided with the water | moisture-content absorber 17 provided in this.

  The moisture absorbing material 17 is formed of, for example, a raised material and can absorb water vapor in the storage chamber 10. The water vapor in the storage chamber 10 may contain salt generated from the object X. In addition, ozone may be generated in the water vapor by electric discharge. The moisture absorbing material 17 absorbs water vapor containing salt, so that damage to the inner wall of the storage chamber 10 and the electrodes 13a and 13b due to salt can be prevented, and formation of a conductive path on the inner wall can be prevented. Further, the moisture absorbing material 17 absorbs water vapor containing ozone, thereby preventing damage to the inner wall of the storage chamber 10 and the electrodes 13a and 13b due to ozone. The moisture absorbing material 17 does not need to be in a form that covers all of the electrodes 13a and 13b and the object X, and may be any configuration that can absorb moisture in the storage chamber 10.

  The moisture absorbing material 17 needs to be formed with a strength that can withstand the weight of the absorbed moisture. Moreover, when the moisture in the storage chamber 10 is reduced by absorbing moisture with the moisture absorber 17, the moisture in the moisture absorber 17 is supplied into the storage chamber 10. Thereby, it can prevent that the target object X dries more than necessary.

  Further, the moisture absorbing material 17 may contain carbon. Carbon has a function of decomposing ozone. Therefore, when the moisture absorbing material 17 includes carbon, the moisture absorbing material 17 decomposes ozone contained in the water vapor, and prevents or reduces damage to the inner wall of the storage chamber 10 and the electrodes 13a and 13b due to ozone. be able to. At this time, the moisture absorbing material 17 itself does not contain carbon, and the sheet-like moisture absorbing material 17 and the sheet-like carbon may be in two layers.

  In addition, as for carbon, for example, the ignition temperature of charcoal is 250 ° C. to 300 ° C., and spark discharge may occur and smoke may be generated when the temperature reaches such a level. Therefore, it is preferable to control the carbon content of the moisture absorbing material 17 so as not to become a high temperature of an ignition temperature of 250 ° C. or more while minimizing the carbon content to prevent smoke and ignition. In addition, the thawing device 1D may include a detection unit (not shown) that detects smoke when it smokes. Depending on the detection by the detection means, it is possible to take measures such as lowering the applied voltage or stopping the application.

  Here, when the electrode 13 a is a plate electrode, moisture is not absorbed by the moisture absorbent material 17. Therefore, for example, as shown in FIG. 3, the electrode 13 a needs to have a shape in which moisture is absorbed by the moisture absorbing material 17 in a lattice shape or the like.

  According to the thawing device 1E according to the fifth embodiment, the storage chamber 10 can be prevented from being deteriorated by having the moisture absorbing material 17 and absorbing the moisture in the storage chamber 10.

  Similarly to the thawing device 1A according to the first embodiment, the thawing device 1E according to the fifth embodiment uses only the general ambient temperature and uses only the Joule heat by effectively using electric energy and heat exchange energy. Compared to the method of thawing and the method of thawing while raising the temperature by heat transfer from the surroundings to the inside, the thawing can be performed to a predetermined temperature in the storage chamber 10 in a short time uniformly and efficiently.

  In addition, when the electrode 13a is a plate-like electrode, the electrode 13a is formed in a reverse concave shape, and the center portion of the ceiling is recessed so that the end portion is positioned lower than the center portion. The water adhering to the electrode 13a can be dropped from the end of the electrode 13a.

[First Modification]
As shown in FIG. 11, the thawing device 2 </ b> A according to the first modification has electrodes 13 a and 13 b that are different from the thawing device 1 </ b> A according to the first embodiment described above with reference to FIG. It is different in that it is not arranged in parallel, but is arranged in parallel with both opposing side surfaces. The discharge electrode needle 13c is also disposed on the electrode 13a installed in parallel with the side surface.

  By installing the electrodes 13a and 13b and the discharge electrode needle 13c on the side surface, the thawing of the object X can be promoted from the side surface.

  In this case, since water does not accumulate in the electrodes 13a and 13b, the electrodes 13a and 13b may have a plate shape. On the other hand, there is a possibility that moisture generated by the thawing of the object X may accumulate on the support portion 12 on which the object X is directly placed. Therefore, it is preferable that the support portion 12 has a configuration in which moisture does not accumulate and water generated from the object X falls into a water tank on the floor of the storage chamber 10.

  Similarly to the thawing device 1A according to the first embodiment, the thawing device 2A according to the first modification uses only the general ambient temperature by using the electric energy and the heat exchange energy, and only the Joule heat. Compared to the method of thawing and the method of thawing while raising the temperature by heat transfer from the surroundings to the inside, the thawing can be performed to a predetermined temperature in the storage chamber 10 in a short time uniformly and efficiently.

[Second Modification]
As shown in FIG. 12, the thawing device 2B according to the second modification has a plurality of electrodes 13a and 13b parallel to the floor as compared with the thawing device 1A according to the first embodiment described above with reference to FIG. It is different in that the object X is disposed between these electrodes 13a and 13b.

  The thawing device 2B shown in FIG. 12 realizes downsizing for efficiently thawing a large amount of the object X by stacking in the vertical direction and effectively using the space even when the installation area is small. can do.

  Here, it is necessary that the object X on the electrode 13a is in contact with the discharge electrode needle 13c or the wall or ceiling of the storage chamber 10 so that a conductive path is not generated between the different electrodes 13a and 13b. Therefore, it is preferable to install a stopper 16 formed of an insulator so that the object X on the electrode 13a does not contact another discharge electrode needle 13c and does not contact the wall or ceiling of the storage chamber 10. The electrodes 13a and 13b and the discharge electrode needle 13c can be controlled by the electrode control device 14.

  Similarly to the example described above with reference to FIG. 7, the object X may be placed in a floating state with respect to the electrode 13 b by being placed on the mounting table 12 a formed of an insulator. At this time, it is desirable that the mounting table 12a has a configuration in which moisture does not accumulate on the surface, and water generated from the object X falls on the floor of the storage chamber 10.

  Note that the thawing device 2B described with reference to FIG. 12 includes a water tank 15 so that no discharge occurs even when moisture is generated from the object X.

  Moreover, each storage chamber 10 of such a plurality of vertically connected thawing apparatuses 2B may be set at different heights. Thereby, the target object X from which each height differs can be put into the storage chamber 10 suitable for it, and it can thaw | decompress rapidly.

  In the thawing device 2B shown in FIG. 12, the electrode 13a above each object X is provided with a discharge electrode needle 13c, and the electrode 13b below each object X and the object X are brought into direct contact with each other, thereby thawing by Joule heat. It has a configuration that emphasizes. On the other hand, it is good also as a structure provided with the discharge electrode needle | hook 13c also in the electrode 13b below each target object X like the thawing | decompression apparatus 1B which concerns on 2nd Embodiment. In this case, since the discharge electrode needle 13c that discharges charged particles both above and below is provided, the surface of the object X is almost uniformly exposed to charged particles on both the upper surface and the lower surface, so that the entire surface of the object X is uniformly thawed. can do.

  Thus, when the space for arranging the object X is formed in multiple stages by the electrodes 13a and 13b, it is necessary to prevent discharge from occurring between the lower electrode 13a and the upper electrode 13b. For example, the lower electrode 13a and the upper electrode 13b can be connected by a conductive wire to be integrally formed. That is, if the lowermost stage 13b is used as the discharge electrode, the lowermost stage 13a and the upper stage 13b can be used as an integral grounding electrode, and the upper stage 13a can be arranged as the discharge electrode. Similarly to the thawing device 1A according to the first embodiment, the thawing device 2B according to the second modified example uses only the general ambient temperature by using the electric energy and the heat exchange energy, and only the Joule heat. Compared to the method of thawing and the method of thawing while raising the temperature by heat transfer from the surroundings to the inside, the thawing can be performed to a predetermined temperature in the storage chamber 10 in a short time uniformly and efficiently.

  FIG. 12 shows an example in which a plurality of electrodes 13a and 13b are arranged in the vertical direction, but the electrodes 13a and 13b are stored in a storage chamber like the thawing device 2A according to the first modification described above with reference to FIG. A configuration may be employed in which a plurality of objects X are arranged in parallel with the ten side surfaces, and different objects X are arranged between the electrodes 13a and 13b. In this case, each of the plurality of electrodes 13a has a discharge electrode needle 13c. Further, the electrodes 13a and 13b and the discharge electrode needle 13c can be independently controlled by the electrode control device 14.

  Thus, even when the space for arranging the object X is formed in multiple stages in the horizontal direction by the electrodes 13a and 13b, a space for arranging the different object X is formed as in the case described above with reference to FIG. It is necessary to prevent discharge from occurring between the electrode 13a and the electrode 13b. For example, the electrode 13a and the electrode 13b that form different spaces can be connected by a conductive wire to be integrally formed. If the electrode 13b forming the first space is a discharge electrode, the electrode 13a in the first space and the 13b in the second space are used as an integral ground electrode, and the outermost electrode 13a is used as the discharge electrode.

[Third Modification]
The above-described thawing device may be provided in a general refrigerator. For example, as shown in FIG. 13, the thawing device 2C according to the third modification has a thawing function using an electric field in addition to a normal refrigeration function, and is provided in a refrigerator.

  The storage room 10 is provided in the refrigerator as a part of the refrigeration room, and can be used as a refrigeration room when thawing is not performed. After thawing, the object X may be used for storage.

  When the object X is thawed as described above, it is preferable that the object X is covered with a food wrap film or the like in order to prevent the object X from drying.

[Fourth Modification]
Further, the thawing device may be integrated with a general microwave oven. That is, the microwave oven may be provided with a thawing function using an electric field in addition to a normal cooking function. Here, it demonstrates with reference to FIG.

  When the thawing function is provided as a part of the function of the microwave oven, after thawing the object X, the thawed object can be cooked by switching from the thawing function to a normal cooking function. For example, whether or not the object X has been thawed can be detected by a temperature sensor (not shown) such as an infrared sensor. For example, a temperature sensor may be used to confirm that no unthawed portion remains in or on the food that is the object X.

  In this case as well, in order to prevent the object X from drying, it is preferable to defrost the object X after covering it with a food wrap film or the like.

  When using a microwave oven with a thawing device as a microwave oven, keep the high frequency transmitted from the microwave from the electrode of the thawing device to the power supply side so that it does not reach the power supply side before the electrode. A filter that prevents high-frequency propagation can be provided.

  As mentioned above, although this invention was demonstrated using each embodiment and a modification, this invention is not limited to embodiment described in this specification. The scope of the present invention is determined by the description of the claims and the scope equivalent to the description of the claims. Moreover, you may combine each structure of each embodiment and a modification.

1A to 1E, 2A to 2C Thawing device 10 Storage chamber 11 Temperature control device 11a, 11b Temperature sensor 12 Support part 13a, 13b Electrode 13c Discharge electrode needle 14 Electrode control device X Target

Claims (4)

A storage room for storing objects to be thawed;
A pair of electrodes, a discharge electrode and a grounding electrode arranged with the object sandwiched therebetween,
An electrode control device for controlling application of a voltage for thawing an object between the electrodes;
A sensor for measuring the temperature of the object;
At the start of thawing of an object, an object is obtained from a value measured by the sensor by executing an initial control for controlling the temperature in the storage chamber to a predetermined initial temperature higher than a thawing target temperature for thawing the object When the temperature of the storage room changes from a rapid rise to a gradual rise, the control target temperature in the storage chamber is switched from the initial temperature to the thawing target temperature, and the value measured by the sensor reaches the thawing target temperature. A temperature control device for executing a first temperature control for controlling the temperature in the storage chamber until,
A thawing device comprising:   The temperature control device includes:
  Measured by the sensor when the value measured by the sensor reaches the thawing target temperature or when the temperature rise of the object continues after the value measured by the sensor reaches the thawing target temperature. A predetermined quality maintenance temperature for maintaining the quality of the target object at the control target temperature in the storage chamber at any one of the timings when the temperature of the target object obtained from the obtained value changes from a gradual rise to a sudden rise. And executing the second temperature control for controlling the temperature in the storage chamber.
  The thawing device according to claim 1. The temperature control device uses a heat exchanger that takes in cool air in the storage chamber and supplies warm air into the storage chamber, or a heat source that is provided in the storage chamber and warms the storage chamber. Or the thawing | decompression apparatus of Claim 2 . Provided on at least one of said electrodes, according to any one of claims 1 to 3, characterized by further comprising a discharge electrode needle for generating charged particles in response to the control of the electrode controller Thawing device.

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