WO2023013729A1

WO2023013729A1 - Refrigerated storage chamber and electric field formation method therefor

Info

Publication number: WO2023013729A1
Application number: PCT/JP2022/029962
Authority: WO
Inventors: 光一石黒
Original assignee: 株式会社スーリヤ
Priority date: 2021-08-04
Filing date: 2022-08-04
Publication date: 2023-02-09

Abstract

The present invention addresses the problem of providing a refrigerated storage chamber and an electrode driving method therefor that enable both suppression of the frequency of connection switching that sequentially forms an electric field, and also stabilization of an unfrozen state, in a relatively large refrigerated storage chamber.　Provided is a refrigerated storage chamber that has a planar electrode member for forming an electric field in the chamber and that comprises: a plurality of planar electrode members (201) each arranged in a predetermined position on one wall surface of the chamber; a high-voltage power supply (401) that supplies a high voltage for forming an electric field on each planar electrode member; a plurality of high-voltage connection switches (402) that selectively connect the high-voltage power supply to the plurality of planar electrode members; and a connection controller (403) that is capable of setting a sustained duration in which each of the plurality of high-voltage connection switches is closed, and that controls, in accordance with the sustained duration thus set, the opening and closing of the high-voltage connection switches corresponding to at least some of the plurality of planar electrode members.

Description

Refrigerator and its electric field forming method

The present invention relates to a refrigerator that can keep food fresh for a long period of time by refrigerating food in an electric field, and more particularly to a method of forming an electric field in a refrigerator.

When food is stored in the electric field space formed inside the refrigerator, the molecules of the food vibrate due to the electric field, and the non-frozen state can be maintained even if the temperature inside the refrigerator compartment is lowered to several degrees below zero. Various refrigerators have been proposed so far, which utilize this phenomenon to maintain the freshness of food for a long period of time (

Patent Documents

1, 2 and 3).

In particular, Patent Document 3 discloses a device configuration in which a plurality of counter electrodes are provided in a relatively large refrigerated storage, and the electrical connection between one voltage generator and the plurality of counter electrodes is sequentially switched by a changeover switch. disclosed. According to Patent Document 3, by sequentially switching electrical connections at intervals of several seconds, for example, even in a relatively large refrigerator, there is no need to equip a plurality of voltage generators, thereby reducing power consumption. achievable.

JP-A-2001-215074 Japanese Patent No. 3862085 JP 2020-106152 A

In order to form the electric field space in the refrigerator described above, a high voltage of about 2500 V to 7000 V, for example, is applied to the electrodes inside the refrigerator. For this reason, the changeover switch used in the refrigerator disclosed in Patent Document 3 is required to have specifications that can withstand the operation of sequentially switching the high voltage at intervals of several seconds. As such a changeover switch, an electromagnetic relay is normally used which is highly insulated and whose contacts are made of a long-life material with low contact resistance.

However, since such electromagnetic relays are generally expensive, it is desirable to use them for as long a period as possible. life cannot be achieved.

In addition, in order to keep the objects in the storage in a non-frozen state, it is necessary to form an electric field in the space where the objects are placed, not all the time, but at certain intervals. Formation cycle is an important parameter to maintain the non-freezing state. Patent Documents 1-3 do not recognize the electric field duration and electric field formation period in intermittent electric field formation, and do not provide a means of maintaining a stable unfrozen state.

Therefore, the object of the present invention is to solve the above problems, and in a relatively large refrigerated storage, a refrigerated storage that can achieve both suppression of the frequency of connection switching that sequentially forms an electric field and stabilization of the non-frozen state. An object of the present invention is to provide an electrode driving method.

In order to achieve the above object, a cold storage according to one aspect of the present invention is a cold storage having planar electrode members for forming an electric field inside the storage, wherein predetermined positions are provided on one wall surface of the storage. a plurality of planar electrode members arranged in a row; a high-voltage power supply for supplying a high voltage for forming the electric field to each of the planar electrode members; and selectively connecting the high-voltage power source and the plurality of planar electrode members. It is possible to set a plurality of high-voltage connection switches and a duration and cycle in which each of the plurality of high-voltage connection switches is in a closed state, and set opening and closing of the high-voltage connection switches corresponding to at least part of the plurality of planar electrode members. and a connection control unit for controlling according to the duration and period of time, wherein the plurality of planar electrode members and the plurality of high-voltage connection switches connected to each of the planar electrode members are connected in parallel to the high-voltage power supply. and the connection time is such that the number of openings and closings of the high-voltage connection switch is as small as possible within the length of time during which the object in the refrigerator is not frozen by repeating the electric field formation at the set cycle. It is characterized by being set to the length of time.
Since the duration of applying a high voltage for forming an electric field in the refrigerator can be set for a plurality of planar electrode members, the number of times the high-voltage connection switch is opened and closed without freezing the refrigerated objects in the refrigerator. can be suppressed. As a result, in a relatively large refrigerated storage, it is possible to achieve both suppression of the frequency of connection switching for sequentially forming an electric field and stabilization of the non-frozen state.
According to one aspect of the present invention, the connection control section further selects all or part of the plurality of planar electrode members, and for the selected planar electrode members, the plurality of planar electrode members according to the set duration. The opening and closing of the high voltage connection switch can be controlled. Since a high voltage can be selectively applied to all or part of the plurality of planar electrode members according to the duration, it is possible to form an electric field in a space at a desired position inside the refrigerator.
According to one aspect of the present invention, the connection control unit controls the plurality of high-voltage connection switches to sequentially apply a high voltage to the plurality of planar electrode members in a predetermined order for each duration. be able to. By setting the duration, it is possible to reduce the number of times the high-voltage connection switch is opened and closed without freezing the refrigerated items in the refrigerator.
To achieve the above object, a method for forming an electric field in a refrigerator according to one aspect of the present invention is a method for forming an electric field in a refrigerator having a flat electrode member for forming an electric field inside the refrigerator, The storage includes a plurality of planar electrode members each arranged at a predetermined position on one wall surface of the storage, a high voltage power source supplying a high voltage for forming the electric field to each of the planar electrode members, and the high voltage power source. and a plurality of high-voltage connection switches for selectively connecting the plurality of planar electrode members, and a connection control section for controlling opening and closing of the plurality of high-voltage connection switches, wherein the plurality of planar electrode members and the The plurality of high-voltage connection switches connected to each of the planar electrode members are connected in parallel to the high-voltage power supply, and the connection control unit controls the duration and period in which each of the plurality of high-voltage connection switches is closed. can be set, and the connection time is set so that the high-voltage connection switch is opened and closed as many times as possible within a length in which the object in the refrigerator is not frozen by repeating the electric field formation at the set cycle. The connection control unit controls opening and closing of high-voltage connection switches corresponding to at least some of the plurality of planar electrode members according to the set duration and period, thereby A desired electric field is formed in the chamber by means of electrode members.
A high voltage for forming an electric field in the refrigerator can be sequentially applied to a plurality of planar electrode members according to a set duration, and the high-voltage connection switch can be opened and closed the number of times without freezing refrigerated objects in the refrigerator. can be suppressed, and in a relatively large refrigerated storage, it is possible to achieve both suppression of the frequency of connection switching for sequentially forming an electric field and stabilization of the non-frozen state.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to provide a relatively large-sized cold storage that can both suppress the frequency of connection switching that sequentially forms an electric field and stabilize the non-frozen state. can.

1 is a schematic block diagram of a circuit configuration of a refrigerator according to an embodiment of the present invention; FIG. 4 is a diagram schematically showing the configuration of a high voltage panel and a high voltage connection switch in this embodiment; FIG. 1 is a block diagram schematically showing a circuit configuration of a refrigerator according to a first embodiment of the present invention; FIG. FIG. 4 is a block diagram schematically showing a circuit configuration of a refrigerator according to a second embodiment of the present invention; FIG. 5 is a diagram showing an example of driving the high voltage panel array of the refrigerator according to the second embodiment of the present invention; FIG. 10 is a diagram showing an example of arrangement of a high-pressure panel array of a refrigerator according to a third embodiment of the present invention; 1 is a perspective view showing an example of the appearance of a high pressure panel used in the present invention; FIG. 8A is a front view of the high-voltage panel illustrated in FIG. 7, FIG. 8B is a sectional view taken along the line II, and FIG. 8C is a rear view. 9A is a front view of a planar electrode member in the high-voltage panel illustrated in FIG. 7, and FIG. 9B is a cross-sectional view taken along line II-II. FIG. 8 is a schematic cross-sectional view for explaining the configuration of the high-voltage panel illustrated in FIG. 7;

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the components described in the following embodiments are merely examples, and the shapes, dimensions, ratios, etc. of the components are for the purpose of explaining the present invention and do not cover the technical scope of the present invention. It is not intended to be limited only to them.

1. Embodiment In FIG. 1, a cold storage 300 is composed of a housing 301, and a plurality of high-pressure panels P are arranged in an arbitrary form in a required range in a required number on one inner wall surface thereof. It is assumed that the housing 301 is composed of a conductor having a rectangular parallelepiped shape with length La, width Lb, and height H. As shown in FIG. In this embodiment, to simplify the explanation, it is assumed that m×n high voltage panels P ₁₁ to P _mn are arranged to form the high voltage panel array 100 . Needless to say, the number and layout of the high-voltage panels P are arbitrary, and it is only necessary to determine which high-voltage panel P is located at which position in the housing 301, and is limited to the matrix configuration as in the present embodiment. not something.

Although details will be described later, each high-voltage panel P is provided with two

flat electrode members

201a and 201b, to which a high voltage is applied separately or in common, and the housing 301 is grounded. . Hereinafter, when the

plane electrode members

201a and 201b are not distinguished, they are referred to as "plane electrode member 201". The configuration of the high-voltage panel P is not limited to that of the present embodiment either, and each high-voltage panel P may have a configuration in which one plane electrode member 201 is provided.

The high-voltage power supply 401 is connected to a high-voltage connection switch 402 through a high-voltage cable, and the high-voltage connection switch 402 switches the connection between the high-voltage power supply 401 and each planar electrode member 201 according to the desired length and desired pattern under the control of the connection control unit 403. be able to. Although details will be described later, the high voltage connection switch 402 can apply a high voltage (for example, 2500 to 7000 V) to the planar electrode 201 of the high voltage panel P installed at an arbitrary position. A predetermined electric field E is formed in the space in front of the flat electrode member 201 to which a high voltage is applied. The non-frozen state can be maintained even if the temperature is lowered to a degree, and the freshness of food can be maintained for a long period of time.

As illustrated in FIG. 2, the interior of the refrigerator 300 has a floor surface 302, a side wall surface 303 and a ceiling surface 304, and the high pressure panels P ₁₁ to P _mn are arranged on the ceiling surface 304. . Two

planar electrode members

201a and 201b in an arbitrary high-voltage panel P _ij (i=1 to m, j=1 to n) are connected by high-voltage cables through

connections

404 and 405 and switches SW1 and SW2 of high-voltage connection switch 402, respectively. It is connected to a high voltage power supply 401 . The connection control unit 403 performs on (ON)-off (OFF) control of the switches SW1 and SW2 of the high voltage connection switch 402 according to a predetermined pattern. That is, when only the switch SW1 of the high-voltage connection switch 402 is closed, a high voltage is applied only to the planar electrode member 201a, and when only the switch SW2 is closed, a high voltage is applied only to the planar electrode member 201b, and both the switches SW1 and SW2 are closed. A high voltage is applied to both

planar electrode members

201a and 201b. The two

flat electrode members

201a and 201b of each high voltage panel P can be electrically connected at the connecting portion 405 to form one flat electrode member. The same is true for other high pressure panels.

2. Example 2.1) First Example Hereinafter, it is assumed that six high-voltage panels P are arranged on the ceiling surface 304 which is one inner wall surface of the housing 301 to form the high-voltage panel array 100 . As described above, each high voltage panel P is provided with two

plane electrode members

201a and 201b. It is assumed that the electrode member 201 is formed. Therefore, the planar electrode members 201 of the six high voltage panels P can be selected by switches using electromagnetic relays. Alternatively, two planar electrode members of each high-voltage panel P may be selected by switches using electromagnetic relays.

As illustrated in FIG. 3, the high-voltage connection switch 402 is provided with electromagnetic relays RL ₁ to RL ₆ corresponding to the six high-voltage panels P, respectively. Common terminals of the electromagnetic relays RL ₁ to RL ₆ are connected to corresponding terminals of the connecting portion 404 , and the connecting portion 404 is detachably connected to the connecting portion 405 on the high voltage panel P side. When the

connections

404 and 405 are coupled, the common terminal of each of the electromagnetic relays RL ₁ -RL ₆ is connected to the corresponding planar electrode member 201 of the high voltage panel P through the

connections

404 and 405 . Normally open terminals of the electromagnetic relays RL ₁ to RL ₆ are commonly connected to the high voltage power supply 401 . That is, as shown in FIG. 3, six high voltage panels P and electromagnetic relays RL ₁ to RL ₆ corresponding to each high voltage panel P are connected in parallel to a high voltage power supply 401 . Therefore, for example, by passing a current through (exciting) the coil terminal of the electromagnetic relay _RL1 , the contact is closed (closed state), and a high voltage is applied from the high voltage power supply 401 to the corresponding planar electrode member 201 of the high voltage panel P. The same applies to the other electromagnetic relays _RL2 - _RL6 . Hereinafter, a state in which the contacts of the electromagnetic relay are closed is referred to as an ON (closed) state, and a state in which the contacts are opened is referred to as an OFF (open) state. Each electromagnetic relay RL of such a high-voltage connection switch 402 is ON-OFF controlled by the connection control section 403 .

The connection control unit 403 includes a switch control unit 410 that controls the ON-OFF order of the electromagnetic relays RL ₁ to RL ₆ of the high-voltage connection switch 402, and the length of time that the electromagnetic relays maintain the ON state (closed duration T _ON ) and an ON timer 411 for arbitrarily setting the period (T). The connection control unit 403 having such functions can be realized by executing a program on the processor of the computer.

According to this embodiment, the electromagnetic relays RL ₁ to RL ₆ can be sequentially selected in a predetermined order. The electromagnetic relays RL ₁ to RL ₆ are sequentially energized for each T _ON time, and when the electromagnetic relay RL ₆ is completed, the first electromagnetic relay RL ₁ is energized. High voltages are sequentially applied to the P planar electrode members 201 in the same order.

The ON timer 411 sets _{the TON} time during which the electromagnetic relays are excited and the ON state continues, and the period (cycle T) until each electromagnetic relay is next turned ON. However, in this embodiment, T=6×T _ON . The _TON time is the length of time during which the high voltage is applied to the planar electrode member 201, thereby creating an electric field in the environment of the object. The _TON time is set to the length of time during which the number of opening and closing of the contacts of the electromagnetic relay is as small as possible within the length of time during which all the objects in the refrigerator 300 are not frozen by the repeated electric field formation at the period T. obtain. If the _TON time is too long, objects in the electric field will not freeze, but other objects will likely freeze. Conversely, if the _TON time is too short, the ON-OFF operation of the contacts of the electromagnetic relay becomes frequent, shortening the life of the relay. Furthermore, short _TON times can freeze all objects due to the short time in the electric field. Thus, depending on the size of the refrigerator 300, the freezing capacity, etc., there is an optimum _TON time that does not freeze the objects in the refrigerator and lengthens the life of the electromagnetic relay. An ON timer 411 can be used to set the optimal _TON time. As an example, when the housing 301 of the cold storage 300 is a 20-foot container, setting the _TON time to about 3 minutes was able to maintain optimal non-freezing conditions.

In the above example, the high voltage connection switch 402 is controlled so as to apply a high voltage to each high voltage panel P having two flat electrode members 201. However, the present invention is not limited to this. The two

planar electrode members

201a and 201b can also be controlled separately, in which case a high voltage is applied to each of the 2×6 planar electrode members 201 in sequence. It is also possible for the switch control unit 410 to sequentially excite the corresponding electromagnetic relays RL in units of two high-voltage panels (that is, four flat electrode members) or in units of more flat electrode members. . It should be noted that not only the method of sequentially applying the high voltage to the high voltage panel P or the flat electrode members 201 in a predetermined order, but also the method of randomly applying the high voltage can be employed. In addition, since a plurality of electromagnetic relays RL are connected in parallel to the high-voltage power supply 401, and the closed duration _TON and period T can be arbitrarily set, there is a time (interval) in which none of the electromagnetic relays RL are energized. , it is also possible to set the closing duration _TON and period T such that each electromagnetic relay RL is energized sequentially or randomly. By providing intervals, the closed duration _TON and the period T of the plurality of electromagnetic relays RL can be set optimally according to the position of the panel P connected to each electromagnetic relay RL, and power consumption can be suppressed. can. In addition, the closed duration T is set so that the electromagnetic relays RL are excited sequentially or randomly with a time (overlapping time) during which two or more electromagnetic relays selected from the plurality of electromagnetic relays RL are simultaneously excited. It is also possible to set _ON and period T. By providing the overlapping time, the closed duration _TON and period T of the plurality of electromagnetic relays RL can be optimally set according to the position of the panel P connected to each electromagnetic relay RL.

2.2) Second Embodiment In the first and second embodiments described above, all high voltage panels or flat electrode members 201 are sequentially selected and a high voltage is applied thereto, but the present invention is not limited to this. Alternatively, a desired partial area of the high voltage panel array 100 or all of the planar electrode members 201 can be selected to locally form an electric field in the refrigerator. That is, the planar electrode members 201 in the partial regions of the high voltage panel array 100 may be sequentially selected in the same manner as in the first embodiment described above.

As illustrated in FIG. 4, the high-voltage panel array 100, the high-voltage power supply 401, the high-voltage connection switch 402, and the

connection parts

404 and 405 have the same configurations as in the first embodiment. Accordingly, members having similar functions are denoted by the same reference numerals or symbols, and detailed description thereof is omitted.

The connection control unit 403a in the second embodiment includes a switch control unit 410a for controlling which region of the high-voltage panel array 100 to select a flat electrode member to apply a high voltage, and a high voltage and an ON timer 411 for arbitrarily setting the ON time length (T _ON ) and period (T) in which T ON is applied. The connection control unit 403a having such functions can be realized by executing a program on the processor of the computer.

In the example shown in FIG. 4, it is assumed that the partial array 100a of the high voltage panel array 100 is selected. The switch control unit 410a controls the corresponding electromagnetic relays of the high voltage connection switch 402 so as to sequentially apply a high voltage to the planar electrode members 201 of the selected partial array 100a. are sequentially applied to the planar electrode members 201 of the partial array 100a.

The length of time T _ON during which the high voltage is applied to each planar electrode member 201 of the partial array 100a is determined by the repeated formation of the electric field to freeze the target object in the refrigerator 300, as in the first case. It is set to the length of time that minimizes the number of opening and closing of the contacts of the electromagnetic relay. Therefore, there is an optimum _TON time depending on the size of the space in the refrigerator 300 where the target object is placed, the refrigerating capacity, etc., and the optimum solution can be set by the ON timer 411. .

In addition, the high voltage can be applied not only in units of the high voltage panel P, but also in units of one flat electrode member 201 . It is also possible to use two high-voltage panels (that is, four flat electrode members) as a unit, or more flat electrode members as a unit.

As illustrated in FIG. 5, according to the second embodiment of the present invention as described above, only the partial array 100a of the high voltage panel array 100 provided on the ceiling surface 304 in the refrigerator 300 is selected. . As a result, high voltages are sequentially applied to only the plurality of planar electrode members 201 forming the partial array 100a, and freezing can be prevented by placing the refrigerated object M in the electric field space formed thereby.

2.3) Third Embodiment In the above-described first and second embodiments, the high-pressure panel P is arranged on one inner wall surface of the refrigerator 300, but it is not limited to this, and a plurality of inner walls are arranged. You can place it on the wall. A third embodiment in which high-pressure panels P are arranged on a plurality of side walls 303 of a refrigerator 300 will be described below.

As illustrated in FIG. 6, a refrigerator 300 according to the third embodiment of the present invention is provided with high voltage panel arrays 100a and 100b on opposing side wall surfaces 303a and 303b, respectively. Here, a high voltage is individually applied to the plurality of high voltage panels P or the plane electrode members 201 of the high voltage panel array 100a, and the high voltage panel array 100b is commonly connected to the high voltage power source 401. FIG. The circuit configuration for sequentially applying a high voltage to each high voltage panel P or the flat electrode member 201 of the high voltage panel array 100a, that is, the high voltage connection switch 402, the connection control unit 403 and the high voltage power supply 401 are the same as those of the first and second embodiments described above. Since it is the same, the explanation is omitted.

The first and second embodiments of the present invention described above can also be applied to the configuration in which the high-voltage panel arrays 100a and 100b are arranged on the opposing side wall surfaces 303a and 303b of the refrigerator 300 in this way. Note that the refrigerator storage 300 according to the present invention is not limited to the configuration in which the high-voltage panel array 100 is installed on the ceiling surface 304 or the side wall surface 303 , and can also be installed on the floor surface 302 .

2.4) Effect As described above, according to the first to third embodiments of the present invention, a high voltage can be sequentially applied to all or part of the planar electrode members 201 constituting the high voltage panel array 100. can be done. At that time, the ON timer 411 is used to set the length of the high voltage application time _TON to an optimum value, that is, the length of time during which the target object in the refrigerator 300 does not freeze due to repeated electric field formation. It can be set to the length of time during which the relay contacts are opened and closed as few times as possible. In this way, in a relatively large-sized cold storage, it is possible to achieve both suppression of the frequency of connection switching for sequentially forming an electric field and stabilization of the non-frozen state.

3. Examples of High Voltage Panels Various forms of high voltage panels P can be used in the embodiments described above. An example of the high pressure panel P that can be used in the above embodiments will be described below.

Referring to FIG. 7, the high-voltage panel _Pij used in the above embodiment includes two

planar electrode members

201a and 201b (hereinafter collectively referred to as ) is fixed, and the front surface of the frame member 101 is covered with the protective sheet 102 . Needless to say, the configuration shown in FIG. 7 is an example, and a frame member having a length L1, a width W, and a thickness D may be used alone, or two may be connected and used as shown in the figure. . As an example, the length L is about 2 m, the width W is about 1 m, the thickness D is about 6 cm, and the length L1 is 95-97 cm. For example, if the cold storage 300 used is a 20 foot container, the high pressure panel P _ij has a length L = 2035 mm, a width W = 940 mm, and a thickness D = 60 mm, for a total of 8 high pressure panels. can do.

Note that the front side of the paper surface of FIG. 7 is the electric field formation side (or front side), and the back side of the paper surface is the wall surface side (or back side) of the refrigerator. A detailed configuration of the high voltage panel _Pij will be described below.

In FIG. 8, two flat electrode members 201 are fixed within the frame of a frame member 101, a heat insulating resin plate 202 is fixed on the front side of the flat electrode member 201, and a protective sheet 102 is placed over the entire surface of the frame member 101. covering. The frame member 101 is molded using, for example, fiber reinforced plastic (FRP). The heat-insulating resin plate 202 is made of, for example, foamed polyurethane molded into a plate shape, and protects the planar electrode member 201 from the low-temperature environment in the refrigerator due to its excellent heat-insulating properties. The thickness t1 of the heat-insulating resin plate 202 may be such that a predetermined heat-insulating effect can be obtained, and is about 15 mm here using foamed polyurethane.

The protective sheet 102 is provided to protect the planar electrode member 201 from water droplets, condensation, washing with disinfectant, etc. in the refrigerator, and is made of, for example, polycarbonate (PC) and has a thickness t2 of about 1 mm. . The planar electrode member 201 is fixed by an appropriate fixing means (tapping screws or the like) at a position separated by a predetermined distance d from the rear surface (wall surface) of the frame member 101 so as to be parallel to the rear surface. The predetermined distance d is approximately 45 to 50 mm, and here d=46 mm. The planar electrode member 201 will be described in detail below.

In FIG. 9, a planar electrode member 201 has a rectangular shape with a length L2 and a width W2. It consists of two long

rectangular resin plates

210a and 210b. Specifically, the planar electrode 210 is sandwiched between

resin plates

210a and 210b near the center and crimped, whereby the planar electrode 210 is confined within the

resin plates

210a and 210b with the lead wire 220 exposed, and the outer periphery of the planar electrode 210 is closed. An outer resin plate outer peripheral portion 211 is formed from . As an example, the length L2 is 90-93 cm, and the width W2 is around 90 cm.

The planar electrode 210 is enclosed in the resin plate 210 so that it is not exposed to the outside, making it extremely easy to handle as the planar electrode member 201 . In addition, since it is covered with resin, it is less susceptible to the external environment, improving the reliability of the high-voltage panel.

A plurality of through holes 212 are provided in the resin plate outer peripheral portion 211 , and the planar electrode member 201 is fixed to the frame member 101 by passing the tapping screws 113 through these through holes 212 . The resin plate peripheral portion 211 for fixing can be formed at the same time only by sandwiching the planar electrode 210 between the

resin plates

210a and 210b and crimping them. It is also possible to form the through holes 212 at the same time in this crimping process. Here, through-holes 212 are formed at the four corners of the outer peripheral portion 211 of the resin plate and at the central portion of each side. The flat electrode 210 is desirably made of lightweight, mechanically and chemically strong stainless steel mesh. In this embodiment, the thickness of the planar electrode 201 is approximately 0.5 mm. Further, the thickness t3 of the flat electrode member 201 formed by pressing the flat electrode 210 between the

resin plates

210a and 210b is, for example, about 3 mm. ABS resin, for example, can be used for

resin plates

201a and 201b.

Next, an example of a method of attaching the flat electrode member 201 and the heat insulating resin plate 202 to the frame member 101 will be described with reference to FIG.

As schematically shown in FIG. 10, the rectangular rear opening surrounded by the inner wall 110 of the frame member 101 has an area capable of accommodating the similarly rectangular planar electrode member 201 . Further, the inner wall 110 is formed with an inward protrusion 112 for fixing the planar electrode member 201 at a position spaced apart from the rear surface 111 of the frame member 101 by a distance d. The inner protruding portion 112 is provided on the entire circumference of the inner wall 110 of the frame member 101, and a heat insulating resin plate 202 is fitted in the rectangular front side opening as described later.

The flat electrode member 201 is placed on the inner protruding portion 112 from the back side along the inner wall 110 of the frame member 101 and fixed to the inner protruding portion 112 with the tapping screws 113 through the through holes 212 of the outer peripheral portion 211 of the resin plate. This makes it possible to reliably fix the planar electrode member 201 at a position separated from the rear surface 111 by the predetermined distance d. Since a high voltage is applied to the planar electrode 210, the planar electrode member 201 must be securely fixed so as not to come off. Here, a simple, lightweight, and reliable method of fixing the flat electrode member 201 by screwing the tapping screw 113 into the resin of the inner projecting portion 112 has been exemplified. A bolt nut that passes through the projection 112 can also be used.

When the planar electrode member 201 is fixed inside the frame member 101 in this way, the heat insulating resin plate 202 is superposed thereon through the front side opening. For example, the heat insulating resin plate 202 may be fixed by forming a recess in the inner protruding portion 112 of the frame member 101 and fitting it therein. Finally, the entire surface of the frame member 101 including the heat insulating resin plate 202 is covered with the protective sheet 102 .

By constructing the high-voltage panel 10 as described above, the flat electrode member 201 can be easily and reliably attached to the frame member 101, and furthermore, the insulating resin plate 202 and the protective sheet 102 provide a low-temperature environment inside the refrigerator and disinfection during cleaning. Protected from the effects of agents. Needless to say, the frame member 101, the protective sheet 102, the heat insulating resin plate 202, and the

resin plates

210a and 210b are made of an insulating material such as synthetic resin.

As described above, the high-voltage panel _Pij has a simple structure in which the flat electrode member 201 and the heat insulating resin plate 202 are mounted inside the frame member 101, and is extremely easy to manufacture as described above. Moreover, since it is lightweight, the high voltage panel _Pij can be easily moved. Since the flat electrode 210 can be easily installed at a desired position simply by arranging the high-voltage panel _Pij on one wall surface, the required electric field E can be easily formed in the required space inside the refrigerator 300. can.

The refrigerator 300 with high-pressure panels _Pij arranged on one wall is not limited to refrigerators for foods, but also for refrigerating items other than foods, such as animal blood, organs, and microorganisms, which need to be kept fresh for a long period of time. It can be applied to anything as long as it is a repository.

As already mentioned, the high-pressure panel P used in this embodiment is not limited to the configuration shown in FIGS. 7-10. An aluminum flat plate provided with dew condensation prevention means as the flat electrode member 201 may be used as the high voltage panel P, or an aluminum plate may be used as it is as the high voltage panel.

The present invention can be used to create an electric field in relatively large refrigerated storage such as refrigerators and refrigerated containers.

Claims

A refrigerator having a planar electrode member for forming an electric field in the refrigerator,
a plurality of planar electrode members arranged at predetermined positions on one wall surface of the chamber;
a high voltage power supply that supplies a high voltage for forming the electric field to each of the planar electrode members;
a plurality of high voltage connection switches for selectively connecting the high voltage power source and the plurality of planar electrode members;
It is possible to set a duration and a cycle in which each of the plurality of high-voltage connection switches is in a closed state, and the set duration and cycle of opening and closing the high-voltage connection switch corresponding to at least part of the plurality of planar electrode members. a connection control unit that controls according to
with
the plurality of planar electrode members and the plurality of high-voltage connection switches connected to each of the planar electrode members are connected in parallel to the high-voltage power supply;
The connection time is the length of time during which the high-voltage connection switch is opened and closed as few times as possible, out of the length of time during which the object in the refrigerator is not frozen by repeating the electric field formation at the set cycle. A refrigerated storage, characterized in that it is set to
The connection control unit further selects all or part of the plurality of planar electrode members and controls opening and closing of the plurality of high voltage connection switches for the selected planar electrode members according to the set duration. The cold storage according to claim 1, characterized by:
2. The connection control unit controls the plurality of high voltage connection switches so as to sequentially apply the high voltage to the plurality of planar electrode members in a predetermined order for each duration. 2. The refrigerated storage chamber according to 2.
A method for forming an electric field in a refrigerator having a planar electrode member for forming an electric field in the refrigerator, comprising:
a plurality of planar electrode members respectively arranged at predetermined positions on one wall surface of the refrigerator; a plurality of high-voltage connection switches for selectively connecting a high-voltage power source and the plurality of planar electrode members; and a connection control section for controlling opening and closing of the plurality of high-voltage connection switches,
the plurality of planar electrode members and the plurality of high-voltage connection switches connected to each of the planar electrode members are connected in parallel to the high-voltage power supply;
The connection control unit is capable of setting a duration and a cycle in which each of the plurality of high-voltage connection switches is in a closed state,
The connection time is the length of time during which the high-voltage connection switch is opened and closed as few times as possible, out of the length of time during which the object in the refrigerator is not frozen by repeating the electric field formation at the set cycle. is set to
The connection control unit controls opening and closing of high-voltage connection switches corresponding to at least some of the plurality of planar electrode members according to the set duration and cycle, thereby generating a desired electric field in the refrigerator by the planar electrode members. A method for forming an electric field in a refrigerator, characterized by forming an electric field in a refrigerator.