CN103542657A

CN103542657A - Refrigerator and method of preserving food

Info

Publication number: CN103542657A
Application number: CN201210306435.XA
Authority: CN
Inventors: 佐藤寿江; 船山敦子
Original assignee: Hitachi Appliances Inc
Current assignee: Hitachi Appliances Inc
Priority date: 2012-07-10
Filing date: 2012-08-24
Publication date: 2014-01-29
Anticipated expiration: 2032-08-24
Also published as: CN103542657B; JP5750084B2; KR101440017B1; JP2014016108A; KR20140007728A

Abstract

In the ceiling portion (42) of the reduced pressure storage compartment (24) installed at the refrigerating chamber of the refrigerator it is the means for solving this subject, the glass member (70) in which the photocatalytic layer (71) is formed interposes the seal member (72) and it is mounted. In the upper side of the glass member (70), the light source (80) is arranged through the small cap. If the LED (83) of the light source (80) lights the photosilver glass member (70) is penetrated and it is incident in the photocatalytic layer (71). Using this, the photocatalytic layer (71) creates the radical from moisture etc. The gas lamp from food is disassembled with the radical to the carbon dioxide and water. The respiration of vegetable is restrained since the carbon dioxide concentration of the storage compartment (24) rises. The enzyme reaction of fish and meat is suppressed. And the breeding of the microorganism is suppressed.

Description

Refrigerator and food preservation method

Technical field

The present invention relates to refrigerator and food preservation method.

Background technology

The known refrigerator that utilizes the redox of photochemical catalyst all the time.In the first prior art, in the side of refrigerator, photochemical catalyst device (patent documentation 1) is installed.The photochemical catalyst device of the first prior art comprises: hold the photochemical catalyst that the film by titanium dioxide forms, the matrix with photochemical catalyst reaction surface; With the light-emitting diode (hereinafter referred to as LED) that is configured to can throw light on to catalyst, penetrate the visible ray of regulation.LED mainly penetrates indigo plant, the visible ray (light of 400nm～800nm wavelength) such as green, red and ultraviolet ray (light of the wavelength of 360～400nm).In the second prior art, as the main component of photocatalyst film, use the titanium oxide microparticle that comprises rutile-type (patent documentation 2) that is carried with the ultrafine metal particles such as platinum below particle diameter 10nm.Its main component and adhesive ingredients are arranged on matrix, form photocatalyst film.In the second prior art, for this photocatalyst film, from the light of LED illumination wavelength 360～410nm.In the 3rd prior art, use the honeycomb type filter with photochemical catalyst to deodorizing in refrigerator (patent documentation 3).In the 3rd prior art, by use the photochemical catalyst react with visible ray and oxidation catalyst the two as photochemical catalyst, the decomposition of promotion methyl mercaptan and DMDS.In the 4th prior art, when the temperature in storeroom becomes the temperature province of regulation, from LED irradiation ultraviolet radiation (patent documentation 4).

Prior art document

Patent documentation

Patent documentation 1: Japanese kokai publication hei 9-941 communique

Patent documentation 2: TOHKEMY 2003-290664 communique

Patent documentation 3: TOHKEMY 2006-17358 communique

Patent documentation 4: TOHKEMY 2007-3021 communique

Summary of the invention

The problem that invention will solve

In photochemical catalyst reaction, foul smell composition gas and miscellaneous bacteria are decomposed into carbon dioxide and water.In prior art, be only satisfied with foul smell composition gas and miscellaneous bacteria are decomposed, do not consider the effective utilization as the carbon dioxide of decomposition product completely.

So, the object of the invention is to, a kind of refrigerator and food preservation method are provided, its carbon dioxide that makes to have in the storeroom of closed structure increases, and can be used in food preservation.Further object of the present invention is, a kind of refrigerator and food preservation method are provided, it can react by there is photochemical catalyst in the storeroom of closed structure, improves the gas concentration lwevel in storeroom, and the freshness of utilizing this carbon dioxide to suppress the food in storeroom reduces.

The method of dealing with problems

In order to solve above-mentioned problem, refrigerator of the present invention comprises the storeroom of taking in food, and storeroom has closed structure, and the carbon dioxide that being provided with the carbon dioxide for making in storeroom increases increases device.

Also can be that carbon dioxide increases device and decomposed and produced carbon dioxide by the food gas that the food from being stored at storeroom is produced.

Also can be that carbon dioxide increases device and comprises: light source; From the energy of the light of this light source incident, from food gas, generate the photochemical catalyst of carbon dioxide with utilization.

Also can have light-blocking member, this light-blocking member is for the irradiation of the food in suppressing from the light of light source output to storeroom.

Also can there is the decompressor for the pressure of storeroom is reduced pressure.

Also can be, utilize decompressor to make the pressure decreased of storeroom to authorized pressure, make carbon dioxide increase device action.

Accompanying drawing explanation

Fig. 1 is the sectional view of the refrigerator of embodiments of the present invention.

Fig. 2 is the sectional view of the decompression storeroom of the first embodiment.

Fig. 3 is the assembling stereogram of decompression storeroom.

Fig. 4 means the side view of the state before decompression storeroom is installed LED lid.

Fig. 5 means at decompression storeroom the side view of the situation of LED lid is installed.

Fig. 6 means the side view of the situation after decompression storeroom is installed LED lid.

Fig. 7 means the enlarged drawing that the state of LED lid is installed at decompression storeroom.

Fig. 8 means the enlarged drawing that the state of LED lid is installed at decompression storeroom.

Fig. 9 is the figure above of decompression storeroom that the state of LED lid is installed.

Figure 10 means the amplification profile of the state before LED lid is installed LED substrate.

Figure 11 means the amplification profile that inserts the state of LED substrate in LED lid.

Figure 12 means the amplification profile that the state after LED substrate is installed at LED lid.

Figure 13 observes from rear side the stereogram that the LED lid LED substrate is installed.

Figure 14 observes the stereogram of the LED lid that inserts LED substrate from rear side.

Figure 15 observes the stereogram of the LED lid that LED substrate is installed from rear side.

Figure 16 is stereogram and the sectional view of the package body installed in the surrounding that is formed with the glass substrate of photochemical catalyst.

Figure 17 means the amplification sectional view of the situation of the package body before mounting glass substrate.

Figure 18 means the amplification sectional view of the situation of package body when glass substrate is installed.

Figure 19 means the amplification sectional view of the situation of package body when LED lid is installed on glass substrate.

Figure 20 means the decompression control of pressure of storeroom and the process chart of the control of light source.

Figure 21 means that the carbon dioxide reacting in the storeroom that makes to reduce pressure by photochemical catalyst increases, and suppresses the key diagram of the situation that the freshness of food reduces.

Figure 22 is while confirming to take in avocado in decompression storeroom, the chart of change in concentration different experiment according to having or not photochemical catalyst reaction of carbon dioxide and ethylene gas.

Figure 23 is while confirming to take in meat or fish in decompression storeroom, the chart of change in concentration different experiment according to having or not photochemical catalyst reaction of carbon dioxide and foul smell composition gas.

Figure 24 is the chart of variation different experiment according to having or not photochemical catalyst reaction of confirming to be accommodated in the vitamin C surplus of the spinach in decompression storeroom.

Figure 25 be confirm to be accommodated in the cauliflower in decompression storeroom the variation of vitamin C surplus according to having or not the reaction of photochemical catalyst the chart of different experiment.

Figure 26 is the chart of variation different experiment according to having or not photochemical catalyst to react of K value of confirming to be accommodated in the section of the tuna in decompression storeroom.

Figure 27 is the chart of variation different experiment according to having or not photochemical catalyst reaction of confirming to be accommodated in the red degree of the beef in decompression storeroom.

Figure 28 is the sectional view of the decompression storeroom of the second embodiment.

Figure 29 is the sectional view of the refrigerator of the 3rd embodiment.

Figure 30 represent the 4th embodiment for making the structure of the device that carbon dioxide increases.

Figure 31 represents that carbon dioxide is increased to device puts into the situation that the closed containers such as refrigerating box are used.

Figure 32 means that the 4th embodiment's increases device to the carbon dioxide of installing in closed container, the sectional view of the structure of powering from the device of solar generating of the outer setting at closed container.

Description of reference numerals

1: refrigerator main body; 2: refrigerating chamber; 3,4: refrigerating chamber; 5: vegetable compartment; 6～9: door; 24: decompression storeroom; 28: pressure sensor; 29: pump; 40: decompression storeroom main body; 41: shadow shield; 42: the top of decompression storeroom; 43: the bottom of decompression storeroom; 60: food service tray; 70: glass component; 71: photocatalyst layer; 72: seal member; 80: light source; 81:LED lid; 82:LED substrate; 83:LED; 90: controller; 91: the door switch of refrigerating chamber; 92: the door switch of decompression storeroom; 93: food gas sensor; 200: photochemical catalyst reaction generating means; 210: photochemical catalyst portion; 211: support; 212: photocatalyst layer; 220: light source portion; 221:LED substrate; 222:LED; 230: power supply unit; 231,232: electric wire; 232: switch; 300: container; 301: lid; 310: suction pump.

The specific embodiment

Below, based on accompanying drawing explanation embodiments of the present invention.In present embodiment, describing in detail, in airtight storeroom, preserve food as following, utilize this food to increase the carbon dioxide of storeroom, the freshness of utilizing carbon dioxide to suppress food reduces.

As an example of the method that carbon dioxide is increased, can utilize photochemical catalyst reaction.In photochemical catalyst reaction, by decomposing airborne oxygen, hydrogen, moisture, the free radical that reaction of formation is very high, utilizes this free radical that foul smell composition gas is decomposed or removes miscellaneous bacteria.In airtight storeroom, the moisture of food becomes the raw material of free radical, and the free radical that comes from the moisture of food carries out the decomposition of foul smell composition gas and removing of miscellaneous bacteria.From the moisture of food, not only become the raw material of free radical, and be closed in airtight storeroom and generate high humidity environment.Thereby, can suppress food drying and lose local flavor.

Further, the redox reaction of photochemical catalyst reaction, is finally decomposed into carbon dioxide and water by foul smell composition gas and miscellaneous bacteria.Carbon dioxide and water as decomposition product are closed in airtight storeroom.Raw material as the moisture of a side decomposition product as free radical is used again, and plays the effect that maintains high humidity environment.As the carbon dioxide of the opposing party's decomposition product, suppress the enzymatic reaction of meat and fish, the respiration that reduces vegetables prevents deteriorated, suppresses the breeding of microorganism.

By preserve food in airtight storeroom, carry out photochemical catalyst reaction, can be by the foul smell composition gas from food and moisture the raw material as free radical, and then, can be using the carbon dioxide of the decomposition product as photochemical catalyst reaction energetically for the freshness maintenance of food etc.Like this, in airtight storeroom, the primary effect (decomposition and the degerming of foul smell composition gas) that generation is brought by photochemical catalyst reaction and the quadratic response being brought by the carbon dioxide of the product reacting as photochemical catalyst, the freshness that can suppress food reduces.

Therefore, in present embodiment, in having the refrigerator of the storeroom 24 being sealed while taking in food, the parts of the inside of the airtight storeroom 24 in refrigerator or form on other parts of storeroom 24, arrange the photochemical catalyst 71 of ultraviolet ray or visible-light response type.And then, will, for photochemical catalyst 71 is irradiated to visible ray or ultraviolet light source, be arranged at the parts 20 of storeroom 24 or storeroom 24 outsides.

If storeroom 24 is remained to subatmospheric state, can make the gas concentration lwevel in storeroom 24 higher than the gas concentration lwevel of common atmosphere.Thus, can bring into play the quadratic response of carbon dioxide.

［ embodiment 1 ］

Below, use the refrigerator of accompanying drawing explanation an embodiment of the invention.Fig. 1 is the central longitudinal sectional view of the refrigerator of present embodiment.Fig. 2 is the sectional view of the orlop space segment of refrigerating chamber 2.Fig. 3 is the stereogram of decompression storeroom 24.

Refrigerator possesses the refrigerator main body 1 of case shape and can be arranged on the multiple leaf door 6～9 of the peristome of refrigerator main body 1 switch.Refrigerator main body 1 comprises polyurethane foam heat-barrier material 13 and the vacuum heat insulation material (not shown) of the outer container 11 of steel plate system, resinous interior case 12, setting between outer container 11 and interior case 12.In refrigerator main body 1, from top, according to the order of refrigerating chamber 2, refrigerating

chamber

3,4, vegetable compartment 5, a plurality of storerooms are set.In other words, the superiors are refrigerating chamber 2, and orlop is vegetable compartment 5, separates respectively configuration, between refrigerating chamber 2 and vegetable compartment 5, are equipped with above-mentioned two chambers with the separated refrigerating

chamber

3,4 of heat insulation mode.Refrigerating chamber 2 and vegetable compartment 5 are storerooms (for example 5 ℃ of degree) of refrigerated storage temperature

band.Refrigerating chamber

3,4 is storerooms of 0 ℃ of following cryogenic temperature band (for example temperature band of about-20 ℃～-18 ℃).These storerooms 2～5 are separated

wall

33,34,35 and divide.

Before refrigerator main body 1, be provided with the door 6～9 of the front openings portion of closed storage room 2～5.Refrigerating-chamber door 6 is doors of the front openings portion of closing cold room 2, and refrigerating chamber door 7 is the doors of closing the front openings portion of refrigerating chamber 3, and refrigerating chamber door 8 is the doors of closing the front openings portion of refrigerating chamber 4, and vegetable compartment door 9 is the doors of closing the front openings portion of vegetable compartment 5.Refrigerating-chamber door 6 is configured to two doors of opening of door-opening type.Refrigerating chamber door 7, refrigerating chamber door 8, vegetable compartment door 9 are configured to the door of pull-out type, and the container in storeroom is together drawn out of with extraction door.

In refrigerator main body 1, be provided with kind of refrigeration cycle.This kind of refrigeration cycle is by by compressor 14, condenser (not shown), capillary (not shown) and evaporimeter 15, again form to being linked in sequence of compressor 14.Compressor 14 and condenser are arranged in the Machine Room of the lower backside setting of refrigerator main body 1.Evaporimeter 15 is arranged in the cooler chamber arranging at the rear of refrigerating chamber 3,4.Above evaporimeter 15, be provided with Air Blast fan 16.

By the cooled cold air of evaporimeter 15, by Air Blast fan 16, to each storeroom of refrigerating chamber 2, refrigerating

chamber

3,4 and evaporimeter 5, carry.Particularly, the cold air of carrying by Air Blast fan 16, through the windshield device (not shown) that can open and close, its part is transported to the storeroom (refrigerating chamber 2 and vegetable compartment 5) of refrigerated storage temperature band.Another part of cold air is transported to the storeroom (refrigerating chamber 3,4) of cryogenic temperature band.

By Air Blast fan 16, be delivered to the cold air of each storerooms such as refrigerating chamber 2, refrigerating

chamber

3,4 and vegetable compartment 5, each storeroom 2～5 is cooling after, by cold air return path, be sent back to cooler chamber.Like this, the refrigerator of present embodiment has the loop structure of cold air, and each storeroom 2～5 is maintained to suitable temperature.

In refrigerating chamber 2, can dismantle and be provided with the multilayer shelf 17～20 that transparent resin plate forms.Undermost shelf 20, the mode of joining with the back side with interior case 12 and two sides arranges, and lower side space is that orlop space 21 separates with superjacent air space.In addition, in the inner side of the refrigerating-chamber door 6 of left and right, be provided with multilayer door frame 25～27.These door frames 25～27 are to arrange to the interior outstanding mode of refrigerating chamber 2 under the state of closing at refrigerating-chamber door 6.At the back side of refrigerating chamber 2, be provided with the backplate 30 that forms the path that the cold air make to supply with from Air Blast fan 16 passes through.

In orlop space 21, the left side when in the face of it starts to be disposed with ice making water tank (not shown) for the ice-making disc the supply system frozen water to refrigerating chamber 3, for taking in the receiver (not shown) of the food such as dessert and for the indoor freshness that reduces pressure to carry out food being kept and the decompression storeroom 24 of long preservation.Decompression storeroom 24 there is the transverse width narrower than the transverse width of refrigerating chamber 2, with the side of refrigerating chamber 2 in abutting connection with configuration.

Not shown ice making water tank and receiver be configured in the face of time the rear of refrigerating-chamber door 6 in left side.Thus, user only, by opening the refrigerating-chamber door 6 in left side, just can extract ice making water tank and receiver out.Decompression storeroom 24 be configured in the face of time the rear of refrigerating-chamber door 6 on right side.Thus, user, only by opening the refrigerating-chamber door 6 on right side, just can extract the food service tray 60 of decompression storeroom 24 out.

In addition, ice making water tank and receiver are positioned at the rear of undermost door frame 27 of the refrigerating-chamber door 6 in left side.Decompression storeroom 24 is positioned at the rear of undermost door frame 27 of the refrigerating-chamber door 6 on right side.Cooling and be delivered to the cold air of refrigerating chamber 2 by evaporimeter 15, by decompression storeroom 24 around, thus the inside of decompression storeroom 24 is indirectly cooling.In addition, the configuration of ice making water tank, receiver, decompression storeroom 24 is not limited to this, for example, can be also omit receiver and increase decompression storeroom 24 width maximization structure or ice making water tank is configured in to the structure of different positions.

At the rear of ice making water tank, be provided with ice making water pump (not shown).Being arranged in the rear of receiver and being the space of the side, rear portion of decompression storeroom 24, dispose the negative pressure pump 29 as an example of the decompressor for decompression storeroom 24 is reduced pressure.As shown in Figure 3, the pump connecting portion that negative pressure pump 29 arranges with side at decompression storeroom 24 is connected by conduit 29A.In the way of conduit 29A, be provided with pressure sensor 28.

The action of 90 pairs of decompression storerooms 24 of controller is controlled.Controller 90 also can be configured to a part for the controller of controlling refrigerator integral body.The force value of controller 90 based in the detected decompression storeroom 24 of pressure sensor 28, controls the action of negative pressure pump 29.

On controller 90, be connected with: for detection of the door switch 91 of door 6 the open and-shut mode of refrigerating chamber 2, for detection of the door 50(of decompression storeroom 24 with reference to Fig. 3) open and-shut mode door switch 92, detect the food gas sensor 93 of the concentration of the food gas in decompression storeroom 24.As described later, controller 90 is confirming the door 6 of refrigerating chamber 2 and the door 50(of decompression storeroom 24 with reference to Fig. 3) close respectively, and the pressure decreased of decompression storeroom 24 is to setting, and the concentration of the food gas of decompression in storeroom 24 become setting above after, to light source 80 output control signals, it is lighted.

As shown in Figures 2 and 3, decompression storeroom 24 comprises: have the decompression storeroom main body 40 of the case shape of peristome for food discrepancy; The decompression door of storage room 50 that the food of storeroom main body 40 of making to reduce pressure is come in and gone out and opened and closed with peristome; With the food service tray 60 of taking in food and coming in and going out with respect to decompression door of storage room 50.User can come in and go out food and use peristome opening by the reduce pressure handle 51 of door of storage room 50 of operation, and extraction food service tray 60, puts into food food service tray 60 or therefrom take out food.Specifically, user's door of storage room 50 that will reduce pressure is extracted out to bodyside, and the decompression state of decompression storeroom 24 is removed in the pressure relief valve action arranging in the part of decompression door of storage room 50 thus, becomes atmospheric state.Thus, user can open decompression door of storage room 50 simply, makes food discrepancy food service tray 60.

Food service tray 60 joins with the bottom 43 with decompression storeroom main body 40 and the mode that can move forward and backward arranges.Food service tray 60 is arranged on the rear side of decompression door of storage room 50, follows decompression moving of door of storage room 50 and moving forward and backward.When user is positioned on food service tray 60 by food and closes decompression door of storage room 50, the inside of decompression storeroom 24 becomes air-tight state.When door 50 is closed, door switch 91 is opened, and drives negative pressure pump 29, and decompression storeroom 24 is depressurized to subatmospheric state.The oxygen concentration reducing pressure thus in storeroom 24 reduces, and can prevent the deteriorated of nutritional labeling in food.In addition, be generally at the door 6 of closing the rear closing cold room 2 of decompression door of storage room 50, therefore also can adopt the structure of the door switch 92 that omits decompression storeroom 24.That is, also can adopt the structure of utilizing the door switch 91 of refrigerating chamber 2 indirectly to judge the open and-shut mode of decompression storeroom 24.

Further, in the present embodiment, the foul smell composition gas producing from the food being kept at decompression storeroom 24 and ethylene gas etc. are carbon dioxide by photochemical catalyst reactions change described later.Thereby, except the above-mentioned effect that decompression brings, can also expect that the freshness being produced by the variation of the gas componant in decompression storeroom 24 keeps effect.In addition, when decompression storeroom 24 decompression of air-tight state, from the food taken in decompression storeroom 24 micro-evaporate moisture.Due to the moisture of this evaporation, in decompression storeroom 24, become high wet condition (for example approaching humidity 100%).And then, also can be as the raw material of free radical from the moisture of food evaporation.

Top at decompression storeroom 24, is provided with the glass component 70 as an example of transparent window portion across seal member 72.That is, the top 42 in decompression storeroom main body 40, is formed with for example peristome of rectangular shape, and the glass component 70 of rectangular shape is arranged on this peristome across seal member 72.The circumferential edges of seal member 72 filling glass parts 70 and the gap between peristome, the seal of maintenance decompression storeroom 24.In when decompression, reducing pressure storeroom main body 40 can deflection, but in this case, in the surrounding of glass component 70, can not produce gap.

As shown in Figure 2, the medial surface of inside that is positioned at decompression storeroom 24 in the two sides of glass component 70 is formed with photocatalyst layer 71.In Fig. 2, for the ease of understanding, represented turgidly the thickness of photocatalyst layer 71.

In the outside of decompression storeroom 24, be provided with the light source 80 of the top that is positioned at glass component 70.Preferred light source 80 and glass component 70 as far as possible closely configure.This is because can make the light quantity that arrives photocatalyst layer 71 by glass component 70 increase.Light source 80 is far away with the distance of glass component 70, more need to increase the output of light source 80.The ultraviolet ray so shorter light of wavelength is easy to decay, so preferred light source 80 is accurately the photocatalyst layer 71 in glass component 70 formation with glass component 70() distance shorter.

Can consider the multiple method that light source 80 is installed on to refrigerator main body 1.The first method is wherein, for example, can consider as shown in Figure 2, and the method for light source 80 is set at the lower surface of undermost shelf 20.The lower surface of undermost shelf 20 approaches the top 42 of decompression storeroom main body 40, if therefore light source 80 is arranged on to this place, can increase the light quantity being absorbed by photocatalyst layer 71.

The second method that light source 80 is installed to refrigerator main body 1 is for example as shown in Figure 3, light source 80 to be configured to the light source cell that can load and unload with respect to the top 42 of decompression storeroom main body 40.Light source cell (light source 80) is positioned at the upside of glass component 70, in the mode that can load and unload, is arranged on top 42.

Can use any one method in the first method or the second method.In the second method, glass component 70 and the light source 80 with photocatalyst layer 71 can be set on decompression storeroom 24 integratedly.In the present embodiment, Fig. 2 represents according to the light source of the first method 80, in Fig. 3～Figure 19, represents according to the light source of the second method 80.In addition, shown in embodiment, also can the glass component 70 of photocatalyst layer 71 and the bottom that light source 80 is configured in decompression storeroom 24 will be there is as described later.

In the first method shown in Fig. 2, light source 80 for example can comprise LED(Light Emitting Diode, light emitting diode) substrate 82 and one or more LED83 of arranging in the lower face side of LED substrate 82.The LED substrate 82 with LED83 can releasably be arranged on the lower surface of shelf 20.

In the second method shown in Fig. 3, light source 80 can be included in LED substrate 82(that lower surface is provided with LED83 with reference to Figure 13), and for LED substrate 82 being arranged on to the LED lid 81 at the top 42 of decompression storeroom main body 40.LED lid 81 also has the function of protection LED substrate 82.

Herein, the light wavelength penetrating for light source 80 is studied.Light for example can be by ultraviolet ray (10～400nm), visible ray (400～800nm), infrared ray (800～4 μ m) classification.

By the catalyst of the stronger ultraviolet-responsive type of ultraviolet ray reaction is formed in the situation of photocatalyst layer 71, light source 80 also forms by penetrating ultraviolet LED.Use in ultraviolet situation, need to be provided for preventing that user from looking at the parts of light source 80 straight.Can also control in linkage with the switch 92 of the door switch 91 of refrigerating chamber 2 or the operation of detection handle 51 switch of light source 80.But, be anti-contingency, be preferably provided for preventing that user from looking at ultraviolet direct-view straight and preventing from using parts.On the other hand, by the catalyst of the stronger visible-light response type of visible ray reaction is formed to photocatalyst layer 71, by the LED that penetrates visible ray, formed in the situation of light source 80, do not need above-mentioned direct-view to prevent from using parts.Thereby using the photocatalyst layer 71 of visible-light response type and the light source 80 of output visible ray is simpler structure.And, with visible ray, causing photochemical catalyst reaction in the situation that, space that need to be in refrigerator main body 1 or the above-mentioned parts of spatial placement in decompression storeroom 24, can not reduce the capacity in these spaces.

Ultraviolet ray has the energy higher than visible ray.The ultraviolet ray of the 350nm that wavelength is longer also has the energy of 343kj/mol.The carbon-carbon bond C-C that forms the resin that forms decompression storeroom 24 is 353kj/mol.Thereby, when irradiating resin, ultraviolet ray there is chemical reaction, and exist polymer chain to be cut off, cut part is combined and is cross-linked with the carbon of other position, and there is deteriorated possibility in resin.The storeroom 24 that particularly reduces pressure need to be closed structure that can resistance to decompression, does not therefore wish because ultraviolet ray makes resin deteriorated.

So, in the present embodiment, use the photocatalyst layer 71 of visible-light response type and the light source 80 of ejaculation visible ray to obtain photochemical catalysts reaction.Near the visible ray of the wavelength 470nm that in the wave-length coverage of use visible ray, energy is stronger is as an example.At LED aspect life-span and luminous efficiency, there is favourable feature, so in the present embodiment, light source 80 is consisted of LED.Be not limited to this, also can use the light-emitting component of other kind.

As the photochemical catalyst of visible-light response type, the known photochemical catalyst reacting in visible region that titanium oxide is processed as for example.Be not limited to this, also can use tungsten oxide.Tungsten oxide, only to visible ray reaction, not to ultraviolet ray reaction, if therefore use tungsten oxide as photochemical catalyst, can obtain higher reaction efficiency.Tungsten oxide does not need to impose processing as titanium oxide, so its use is easier, can reduce the cost when glass component 70 forms.Based on this point, using tungsten oxide is favourable as photochemical catalyst.

By tungsten oxide, form photocatalyst layer 71 and can obtain above-mentioned advantage.But also can be independently to this, by titanium oxide or coordinate or other material of visible ray reaction is formed to photocatalyst layer 71.In addition, if the shortcoming in the time of can allowing to use ultraviolet ray to obtain photochemical catalyst reaction also can adopt and use ultraviolet structure.

The substrate (carrier) that is preferably formed photocatalyst layer 71 can hold photochemical catalyst, and for for causing that the light of photochemical catalyst reaction is transparent.Thereby, preferably by being that transparent glass or resin forms substrate for visible ray.

But resin is organic matter, therefore directly the words of coating photochemical catalyst can cause the deteriorated of resin.In the situation that forming substrate by resin, need to carry out primary coat processing.On the other hand, glass is inorganic matter, and therefore directly coating can be not deteriorated yet.Thereby from aspects such as the worker ordinal number of substrate, material costs, the substrate that preferably holds photocatalyst layer 71 is formed by glass.But, can be also the surface of resin plate to be applied to primary coat process the transparent protective layer of formation, on protective layer, form the structure of photocatalyst layer 71.

The gauge of photocatalyst layer 71 is larger, more can improve the effect of photochemical catalyst reaction, but when gauge is excessive, the transparency can reduce.Thus, the light quantity that sees through photocatalyst layer 71 reduces.Thus, in the situation that by visible ray illumination in storeroom 24 as decompression, because deficiency in light quantity cause the reducing pressure visibility of storeroom 24 reduces.In addition,, when photocatalyst layer 71 is blocked up, photocatalyst layer 71 may split.So, in the present embodiment, set the thickness of photocatalyst layer 71, make to see through light quantity and can too not reduce, and the possibility that physical property is destroyed is reduced.

As mentioned above, from light source 80, see through the visible ray that glass component 70 arrives photocatalyst layer 71, the lighting mechanism irradiating in the storeroom 24 that can also reduce pressure with opposing.But, when light shines directly into the food (food materials) of decompression in storeroom 24, may make due to photooxidation reaction the nutritional labeling oxidation of food, or cause that food fades etc.In addition,, for vegetables, although because the difference of this wavelength exists difference, exist and promote photosynthetic response, consume the possibility of the carbon dioxide in decompression storeroom 24 when irradiating high light.

So, as shown in Figure 2, in the present embodiment, between food and glass component 70, arrange for the opaque shadow shield 41 of the light from light source 80.The light that sees through glass component 70 and photocatalyst layer 71 is covered by shadow shield 41, can be directly to food irradiation.In the situation of the situation of the first method and the second method, all can be at the interior shadow shield 41 that arranges of decompression storeroom 24.As shown in phantom in Figure 2, the gas (carbon dioxide, foul smell composition gas, ethylene gas) in decompression storeroom 24 and moisture etc. are via the gap circulation between shadow shield 41 and top 42.In addition, not necessarily need shadow shield 41, so long as can determine that the position of light source 80 makes not direct irradiation food of visible ray, can suitably suppress the structure of the oxidation of nutritional labeling.

Use Fig. 3～Figure 19, illustrate the structure example having in the glass component 70 of photocatalyst layer 71 and the situation of light source 80 blocking.As shown in the stereogram of Fig. 3, at the top 42 of decompression storeroom main body 40, can load and unload glass component 70 and the light source cell 80 with photocatalyst layer 71 is installed.

Fig. 4 represents glass component 70, after seal member 72 is installed to the peristome at top 42, the state of light source cell 80 to be installed.Fig. 5 represents light source cell 80 to be installed to the state in the process of upside of glass component 70.Fig. 6 represents the state after the upside installation of 80 pairs of glass components 70 of light source cell.Fig. 7 is the figure after a part of Fig. 5 is amplified.Similarly, Fig. 8 is the figure after a part of Fig. 6 is amplified.Fig. 9 observes the figure at the top 42 that light source cell 80 is installed from top.

Figure 10～Figure 15 represents to assemble the situation of light source cell 80.First, Figure 10 is illustrated in the installing space 85 of the lower surface that is formed at LED lid 81, and the state before the LED substrate 82 with LED83 is installed.State after the installing space 85 that Figure 11 represents LED substrate 82 to insert in LED lid 81.State after Figure 12 represents the LED substrate 82 to finish to the installation of the installing space 85 in LED lid 81.

Figure 13 observes the stereogram of the state shown in Figure 10 from the downside of LED lid 81.Figure 14 observes the stereogram of the state shown in Figure 11 from the downside of LED lid 81.Figure 15 observes the stereogram of the state shown in Figure 12 from the downside of LED lid 81.

As shown in figure 15, in the lower face side of LED lid 81, to be positioned at the mode of the downside of installing space 85, a plurality of (for example 2) support 84 separates spacing and forms on width.LED substrate 82 is by these support 84 supportings.The width dimensions WL that is cooperated with LED substrates 82 due to the width dimensions of installing space 85 sets, and therefore LED substrate 82 is being installed to the moment of installing space 85, and LED substrate 82 is positioned on width.In addition, as shown in Figure 12 waits, support 84 arranges obliquely, and therefore, by the depths that LED substrate 82 is inserted to installing space 85, LED substrate 82 is also positioned in the longitudinal direction.

Further, LED substrate 82, therefore can not come off from LED lid 81 by a plurality of support 84 supportings naturally from downside.Support 84 is arranged on the position that can not interfere with LED83.

In addition, also can adopt and LED83 be used to the structure of retainer as location.For example, in the situation that the width dimensions WL of LED substrate 82 is less than the width dimensions of installing space 85, by each LED83 is contacted with immediate support 84, can carry out the location of the width of LED substrate 82.Like this, by making LED83 not only there is lighting function, also there is the function of retainer for location, in the situation that LED substrate 82 being formed less than installing space 85, also just can be by LED substrate 82 location without forming special-purpose retainer.

Figure 16 represents the structure of seal member 72.Figure 16 (a) is the stereogram of seal member 72, and Figure 16 (b) is the sectional view of seal member.At the outer peripheral face of seal member 72, be provided with sealed lip 72A and at the auxiliary lip 72B forming up and down of sealed lip 72A.Sealed lip 72A is for to the parts that seal in the mode of gas-liquid sealing in decompression storeroom 24, and auxiliary lip 72B is the parts for preventing that dust from invading to sealed lip 72A.

Figure 17 represents seal member 72 to be positioned over the state at the top 42 of decompression storeroom main body 40.Figure 18 represents glass component 70 to be placed on the state of the upper surface side of seal member 72.Figure 19 represents further light source cell 80 to be placed on to the state on glass component 70.As shown in Figure 18 and Figure 19, photocatalyst layer 71 need to be in the formation on the whole of the lower face side (medial surface) of glass component 70, as long as form in the region of exposing in decompression storeroom 24.

With reference to Figure 20, the photochemical catalyst effect in decompression storeroom 24 is described.While comprising near the visible ray of light of provision wavelengths (for example, 470nm) from the LED83 output of light source 80, this visible ray incides photocatalyst layer 71 through glass component 70.When visible ray incides photocatalyst layer 71, generate electronics and hole.Hole is with positive charge, therefore from moisture (H ₂o) capture electronics, generate OH free radical and hydroperoxyl radical.In addition the electronics producing in photocatalyst layer 71, is transferred to oxygen molecule and is generated oxygen radical.The moisture that food trace in decompression storeroom 24 evaporates, contacts with photocatalyst layer 71 raw material that becomes free radical.

Free radical for example, for example, is decomposed into carbon dioxide and water by the gas from food (ethylene gas, methyl mercaptan, DMDS) and the small organic matter (miscellaneous bacteria) that swims in storeroom 24 in decompression.As an example, the decomposition reaction of the ethylene gas producing from vegetables is as shown in following chemical formula (1).

C ₂H ₄+4O ₂→2CO ₂+2H ₂O……（1）

From chemical formula (1), the ethylene gas producing from vegetables reacts with airborne oxygen and generates carbon dioxide and water.Vegetables in decompression storeroom 24 are lived, according to the concentration of airborne oxygen and carbon dioxide, recently breathe.When the gas concentration lwevel in decompression storeroom 24 uprises, the stomatal closure of vegetables, respiratory activity is suppressed, therefore can suppress the deteriorated of vegetables.Thereby, can prevent comparatively chronically the minimizing of taste and nutrition.

The meat and the fish that in decompression storeroom 24, preserve, due to dead, keep mechanism different from the freshness of vegetables.But the foul smell composition gas that meat and fish produce and the gas of organic are also reacted and are broken down into carbon dioxide and water by photochemical catalyst.

The carbon dioxide being produced by photochemical catalyst reaction is easy to be dissolved in water.Thereby, as the carbon dioxide solubility of the product of photochemical catalyst reaction, in the moisture of food surface, become carbonic acid.Carbonic acid changes the pH value of food surface.When the pH value of food surface changes, inconsistent with the best pH of the microorganism existing at food surface.Thereby can suppress the breeding of microorganism.

In addition,, because the enzymatic reaction in food also exists best pH, therefore, by the pH value of food is changed, can suppress enzymatic reaction.The freshness of meat and fish reduces along with the development of enzymatic reaction.Thereby, by being changed, the pH value of food suppresses enzymatic reaction, can keep more longways the freshness of meat and fish.

Further, photochemical catalyst decomposes the foul smell composition gas in decompression storeroom 24, the deodorizing in the storeroom 24 that therefore can reduce pressure.And then storeroom 24 is interior in decompression while there is moisture, because the effect of photochemical catalyst generates free radical.Thereby effect that can be by free radical is to carrying out degerming in decompression storeroom 24.

Like this, when the carbon dioxide in decompression storeroom 24 increases, the freshness that can suppress meat and fish reduces, and can also suppress the quality badness of vegetables.But, only utilize carbon dioxide can not suppress the oxidation of food.The in the situation that of meat and fish, when there is oxidation reaction, aliphatic acid is deteriorated, and vitamins etc. are deteriorated.

To this, it is higher that the storeroom 24 of the present embodiment is not only gas concentration lwevel, still remains the decompression storeroom of subatmospheric state.That is, the common atmosphere of ratio of the oxygen concentration in decompression storeroom 24 is low, and on the contrary, the common atmosphere of ratio of the gas concentration lwevel in decompression storeroom 24 is high.

The composition of common atmosphere is oxygen 21%, carbon dioxide 0.4%.Omit nitrogen and other small compositions.If make to reduce pressure, the common atmospheric pressure of the pressure ratio of storeroom 24 reduces by 20%, compares with the composition under atmospheric pressure, and oxygen is 16%, and carbon dioxide is 0.032%.Due to photochemical catalyst reaction, at the interior generation carbon dioxide of decompression storeroom 24, therefore, the gas concentration lwevel of the storeroom 24 that for example reduces pressure rises to the value of 0.13% left and right.These concrete numerical value only, for for understanding an example of the action effect of the present embodiment, the invention is not restricted to these numerical value.

Like this, in the decompression storeroom 24 of the present embodiment, there is the reduction of the oxygen concentration caused by decompression and as the increase of the carbon dioxide of the decomposition product of photochemical catalyst reaction.The relative reduction of the oxygen concentration that decompression causes can suppress oxidation reaction, keeps more longways the freshness of meat and fish.And then as mentioned above, the increase of carbon dioxide can suppress the enzymatic reaction of meat and fish, suppress the breeding of microorganism, suppress the breathing of vegetables and prevent deteriorated.

Further, the decompression storeroom 24 of the present embodiment is preserved food under decompression state, during therefore with common atmospheric pressure state, compare the life-span that can extend free radical, improve the efficiency of decomposition reaction, bacterium and the organic decomposition reaction of the food gases such as ethylene gas.In common situation, the free radical that photocatalyst layer 71 produces and ion and airborne molecule etc. react and disappearance at once.But the molecule in the storeroom 24 that reduces pressure under decompression state reduces, reaction speed slows down.Thereby, think that the life-span of free radical and ion extends to some extent.

Use Figure 21, the example of the control method of decompression storeroom 24 is described.Processing shown in Figure 21 is carried out by controller 90.Processing shown in Figure 21 can be used as computer program and realizes, and also can be used as hardware circuit and realizes.

The signal of the door switch 92 of the open and-shut mode of the door 50 of controller 90 based on from detection decompression storeroom 24, whether decision gate 50 closes (S10).In door 50 situations of closing of decompression storeroom 24 (S10: be), the signal of the door switch 91 of the open and-shut mode of the door 6 of controller 90 based on from detection refrigerating chamber 2, whether decision gate 6 closes (S11).In addition, at the door switch 92 that omits decompression storeroom 24, adopt by the door switch 96 of refrigerating chamber 2 and indirectly judges in the situation of structure of switching of door 50 of decompression storeroom 24, omission S10.

In the situation that confirmed that the door of refrigerating chamber 26 closes (S11: be), 90 pairs of negative pressure pumps of controller, 29 output control signals make it drive (S12), the Bas Discharged in the storeroom 24 that makes to reduce pressure.(S10: no or S11: no), return to step S10 in the situation that any one party in door 6 or door 50 is not closed.

The detection signal that controller 90 monitors from pressure sensor 28, judges whether the pressure P 1 of decompression storeroom 24 becomes predefined authorized pressure Pth following (S13).Controller 90 makes negative pressure pump 29 work until the pressure P 1 of decompression storeroom 24 becomes authorized pressure Pth following (S13: no).The pressure P 1 of decompression storeroom 24 becomes authorized pressure Pth when following (S13: be), and controller 90 makes negative pressure pump 29 stop (S14).

After 24 decompressions of decompression storeroom, the detection signal of controller 90 based on from food gas sensor 93, judges whether the concentration GC1 of the food gas of decompression storeroom 24 becomes the gas concentration GCTh above (S15) of predefined regulation.

Herein, the threshold value GCTh of gas concentration such as can be as threshold value for ethylene gas, threshold value for methyl mercaptan, DMDS by threshold value etc., press the kind of food gas and prepare.And in the situation that any gas concentration in numerous food gas reaches threshold value (S15: be), controller 90 makes light source 80 light (S16).Thus, as mentioned above, carry out photochemical catalyst reaction under reduced pressure atmosphere, food gas is broken down into carbon dioxide and water.And, in the situation that as the concentration of the food gas of object all lower than threshold value (S15: no), controller 90 makes light source 80 extinguish (S17).

In addition, also can omit step S15, the employing in generation makes light source 80 light the structure of certain hour.In this situation, from the flow chart of Figure 21, remove step S15 and step S17, from step S14, be directly transferred to step S16.In addition, the content of step S16 becomes " making photochemical catalyst use the light source igniting stipulated time " from " making photochemical catalyst light source igniting ".Step label symbol S16A after can improving this.

Or light source 80 can also be as the lighting device of decompression storeroom 24, therefore also can adopt at the door 6 of refrigerating chamber 2, open during, the structure that light source 80 is lighted.And then, also can adopt the structure of the light intensity irradiating from light source 80 and/or light wavelength being switched according to situation.For example, can be, during as the lighting device of decompression storeroom 24, only make a part of LED83 in a plurality of LED83 light light source 80, as when promoting the device of photochemical catalyst reaction, all LED83 be lighted.Or, also can adopt the LED83 that carries the light that can export different wave length at light source 80, and the different structure of the wavelength of the wavelength while making as lighting device when promoting that photochemical catalyst reacts.And then, can also adopt when light source 80 is used as to lighting device, reduce the number of lights of LED83 and make wavelength elongated simultaneously, during by the promotion device of light source 80 use photocatalysts reactions, the combination that makes light intensity and wavelength that increases the number of lights of LED83 and shorten wavelength etc. is simultaneously according to the situation of refrigerator and different structures.

Use Figure 22 and Figure 23 explanation to follow the increase of the carbon dioxide of photochemical catalyst effect.Figure 22 represents the avocado that more produces the ethylene gas that promotes that vegetables are deteriorated to be accommodated in the situation of confined space, and the time of the concentration of the variation of the time of gas concentration lwevel and ethylene gas changes.

Characteristic line G10 represents to use the time of the gas concentration lwevel in the situation of photochemical catalyst to change.Characteristic line G11 represents not use the time of the gas concentration lwevel in the situation of photochemical catalyst to change.Characteristic line G12 represents to use the time of the ethylene concentration in the situation of photochemical catalyst to change.Characteristic line G13 represents not use the time in the situation of photochemical catalyst to change.

Take in the concentration of ethylene gas after avocado and rise gradually, in the situation that not using photochemical catalyst, ethylene gas concentration finally remains roughly certain value (G13).Do not use in the situation of photochemical catalyst, the concentration of carbon dioxide is roughly certain (G11) also.On the other hand, use in the situation of photochemical catalyst, ethylene gas utilizes photocatalyst layer 71 to be broken down into carbon dioxide and water, thus the concentration of ethylene gas in time through and reduce (G12).As the carbon dioxide of the decomposition product of ethylene gas in time through and increase (G10).

Thereby the known ethylene gas producing from vegetables is decomposed and generates carbon dioxide by photochemical catalyst.In confined space, carbon dioxide is not easy to leak to outside, so the gas concentration lwevel of confined space raises.Due to the breathing of carbon dioxide inhibition vegetables, the freshness that therefore can suppress vegetables reduces.When in addition, vegetables have the illumination of being subject to, carry out photosynthetic feature.Vegetables carry out light compositing near infrared ray reaction 630nm.The LED83 of the present embodiment mainly exports near the light of wavelength 470nm, therefore can suppress the light compositing of vegetables.

Figure 23 represents meat or fish is kept at the time variation of the gas concentration lwevel in the situation in confined space and the time of foul smell composition gas concentration changes.

Characteristic line G14 represents not use the time of the gas concentration lwevel in the situation of photochemical catalyst to change.Characteristic line G15 represents to use the time of the gas concentration lwevel in the situation of photochemical catalyst to change.Characteristic line G16 represents not use the time of the concentration of the foul smell composition gas in the situation of photochemical catalyst to change.Characteristic line G17 represents to use the time of the foul smell composition gas in the situation of photochemical catalyst to change.

Do not use in the situation of photochemical catalyst, the foul smell composition gas that meat or fish can not be produced decomposes, so the concentration of foul smell gas componant rise gradually (G16).Do not use in the situation of photochemical catalyst, also do not produce the carbon dioxide as the product of photochemical catalyst reaction, the concentration of carbon dioxide is certain (G14) roughly.On the other hand, use in the situation of photochemical catalyst, foul smell composition gas is decomposed into carbon dioxide and water by photochemical catalyst, its concentration in time through and reduce (G17).By photochemical catalyst, react and produce carbon dioxide, thus the concentration of carbon dioxide in time through and increase (G15).

As shown in figure 23, while photochemical catalyst being worked under the state of preserving meat, fish, foul smell composition gas is decomposed, and carbon dioxide increases, and utilizes this carbon dioxide can suppress enzymatic reaction, suppresses the breeding of microorganism.Thereby the freshness that can suppress meat and fish reduces.

Use Figure 24～Figure 26, illustrate that the freshness that the carbon dioxide while preserving vegetables, meat, fish brings keeps effect.Figure 24～Figure 26 is the chart when having or not under the condition of photochemical catalyst vitamin C surplus to spinach, cauliflower and avocado are preserved to 3 days in confined space in the situation that to compare.Figure 24 is accommodated in the situation in confined space by spinach and avocado.Figure 25 is accommodated in the situation in confined space by cauliflower and avocado.Because avocado is the food that is easy to produce ethylene gas, therefore for generation of ethylene gas.

Figure 24 represents the result to using the vitamin C surplus G22 of the spinach in the situation of photochemical catalyst and not using the vitamin C surplus G21 of the spinach in the situation of photochemical catalyst to compare.The vitamin C surplus G20 of known spinach when photochemical catalyst is played a role is larger than not using the vitamin C surplus G23 in the situation of photochemical catalyst.

Figure 25 represents the result to using the vitamin C surplus G22 of the cauliflower in the situation of photochemical catalyst and not using the vitamin C surplus G23 of the cauliflower in the situation of photochemical catalyst to compare.Vitamin C surplus G22 in the situation of known use photochemical catalyst is larger than not using the vitamin C surplus in the situation of photochemical catalyst.According to above experimental result, can confirm, when carbon dioxide is increased, the freshness that can suppress vegetables reduces.

Use Figure 26 and Figure 27, illustrate that the freshness of animal food (meat, fish) changes.Figure 26 represents tuna to preserve in confined space the situation of 3 days.The K value G24 that uses the tuna in the situation of photochemical catalyst is lower than not using the K value G25 in the situation of photochemical catalyst.Hence one can see that, and due to the increase of carbon dioxide, the freshness that can suppress tuna reduces.

The variation of the red degree in the situation that Figure 27 representing beef to preserve 3 days in confined space.Red degree G26 in the situation of known use photochemical catalyst, than not using the red degree G27 in the situation of photochemical catalyst to change still less, can suppress the variable color of meat.

The present embodiment forming like this, can improve the gas concentration lwevel in the decompression storeroom 24 of confined space.Thereby, can suppress the breathing of vegetables, prevent deterioratedly, suppress the breeding of microorganism, the enzymatic reaction of the such food of meat or fish is reduced.Thereby, to compare with the situation that does not increase gas concentration lwevel, the effect of the freshness of maintenance food is higher.

In the present embodiment, in the interior generation photochemical catalyst reaction of airtight decompression storeroom 24, therefore can, in the carbon dioxide of the product as photochemical catalyst reaction is enclosed in decompression storeroom 24, effectively improve the concentration of carbon dioxide.Thereby, can obtain efficiently the above-mentioned freshness maintenance effect that carbon dioxide brings.

In the present embodiment, by from being kept at the moisture of the food trace evaporation decompression storeroom 24 as the raw material of free radical, utilize this free radical that foul smell composition gas and miscellaneous bacteria etc. are decomposed into carbon dioxide and water.Carbon dioxide and water as decomposition product are closed in airtight storeroom.Moisture is reused as the raw material of free radical, and the humidity of decompression storeroom 24 is kept highlyer.Carbon dioxide is realized above-mentioned freshness maintenance effect.

In the present embodiment, by food preservation is carried out to photochemical catalyst reaction in airtight decompression storeroom 24, raw material by foul smell composition gas and moisture as free radical, and, using the carbon dioxide of the decomposition product as photochemical catalyst reaction for the freshness maintenance of food etc.Like this, can be in the environment of roughly sealing, the such photochemical catalyst effect of the decomposition of the foul smell composition gas that photochemical catalyst reaction brings and degerming and the effect of carbon dioxide are combined, the freshness that can suppress food reduces.

Further, in the present embodiment, make airtight decompression storeroom 24 become subatmospheric state and carbon dioxide is increased, therefore can effectively improve the concentration of the carbon dioxide in decompression storeroom 24.In addition,, due to reducing pressure in storeroom 24, therefore can suppress carbon dioxide and leak to the outside of storeroom 24.This is because the outside air pressure of storeroom 24 is higher.And then, due to the air molecule that can reduce in storeroom 24, therefore can extend the life-span of free radical, improve the possibility that free radical decomposes foul smell composition gas and miscellaneous bacteria etc.

［ embodiment 2 ］

Use Figure 28 that the second embodiment is described.Comprise that the following embodiment of the present embodiment is equivalent to the variation of the first embodiment, therefore centered by the difference with the first embodiment, describe.In the present embodiment, the bottom surface side of decompression storeroom 24 will be configured in for carrying out the mechanism of photochemical catalyst reaction.

Decompression storeroom 24 shown in Figure 28, the central portion in the bottom 43 of decompression storeroom main body 40, is provided with the glass component 70 with photocatalyst layer 71 across seal member 72.At the upside of photocatalyst layer 71, across gap, be provided with food service tray 60.By the gap between food service tray 60 and photocatalyst layer 71, foul smell composition gas that derives from the food in food service tray 60 etc. enters and is decomposed by photocatalyst layer 71.Carbon dioxide and the moisture of the decomposition product reacting as photochemical catalyst enter the inside of food service tray 60 by above-mentioned gap, suppress enzymatic reaction and the respiration of food, suppress the breeding of microorganism.

In the situation that food service tray 60 forms by transparent material, from the light of light source 80, to the food irradiation in food service tray 60, exist food due to deteriorated possibilities such as photooxidation reactions.In this situation, can the metallic plate 41 being formed by aluminium or stainless steel etc. be set in the bottom of food service tray 60.This metallic plate 41 not only has the function as shadow shield of narrating in the first embodiment, and the heat that can also bring into play absorption food makes its cooling effect.

The present embodiment forming so also can be realized the effect same with the first embodiment.And in the present embodiment, photocatalyst layer 71 and light source 80 are arranged on to the bottom 43 of decompression storeroom 24, therefore can also be by for promoting cooling heat sink 41 as the shadow shield stoping from the irradiation food of light source 80.Owing to can making a metallic plate 41 there is several functions, therefore can suppress the increase of manufacturing cost, improve the performance of decompression storeroom 24.

［ embodiment 3 ］

With reference to Figure 29, the 3rd embodiment is described.Figure 29 is the sectional view of the refrigerator of the present embodiment, at for example top of vegetable compartment 5, disposes glass component 70 and the light source 80 with photocatalyst layer 71.In general to compare air-tightness lower with decompression storeroom 24 for vegetable compartment 5, but as long as can obtain the air-tightness of stipulating, just can be reacted gas concentration lwevel is increased by photochemical catalyst, the breathing of inhibition vegetables.Also can adopt the integral body of vegetable compartment 5 or a part are formed airtightly, the structure of photochemical catalyst reaction occurs in this airtight space.

［ embodiment 4 ］

Use Figure 30 and Figure 31 that the 4th embodiment is described.In the present embodiment, by separated and form for there is the device of the photochemical catalyst reaction confined space such with decompression storeroom 24.

As shown in Figure 30 (a), for there is the photochemical catalyst reaction generating means 200 of photochemical catalyst reaction, for example can be configured to and comprise: the photochemical catalyst portion 210 that is formed with photocatalyst layer 212 at inner face; Light source portion 220 in the internal configurations of photochemical catalyst portion 210; With the power supply unit 230 for to light source portion 220 power supplies.

Figure 30 (b) is the sectional view of photochemical catalyst portion 210.Photochemical catalyst portion 210 comprises: the support unit 211 of, triangle tubular cylindric such as being formed by opaque resin material or metal material, quadrangular barrel shape, five jiaos of tubulars, hexagonal tubular etc.; The photocatalyst layer 212 forming with the region of the whole or regulation of inner face at support unit 211.Support unit 211 is opaque is in order to reduce light that portion within it the produces possibility to food direct irradiation.Thereby, at the peristome of the both end sides of support unit 211, also can be provided for suppressing the net means of the leakage of light.

Light source portion 220 has: at the LED substrate 221 of the internal configurations of support unit 211; With on LED substrate 221, be provided with at least more than one LED222.In the present embodiment, the center line along the length direction of the LED substrate 221 of elongated plate-like, separates predetermined distance by a plurality of LED222 and configures.

LED222 with above LED substrate 221 and below this both direction mode of irradiating configure.As the first method, for example, can adopt the center that LED222 is embedded to the thickness direction of LED substrate 221, the structure of irradiating light below a LED222 makes progress.As the second method, the structure that also can adopt upper surface and lower surface at LED substrate 221 that LED222 is set respectively.It is lower that the first structure and the second method are compared manufacturing cost.

Power supply unit 230, such as consisting of dry cell, battery, home-use lamp cord etc., is connected with light source portion 220 by electric wire 231.By actuating switch 232, the LED222 power supply from power supply unit 230 to light source portion 220.In addition, also can adopt timer is set, after actuating switch 232 through during the stipulated time, the structure that switch 232 is disconnected.

Figure 31 means the schematic diagram of the example of photochemical catalyst reaction generating means 200.For example, in the closed container 300 that refrigerating box etc. can open and close, take in food and photochemical catalyst reaction generating means 200, closing cap 301.Thus, the gas concentration lwevel in closed container 300 rises, and reaches the effect identical with the first embodiment.

Further, in the present embodiment, form respectively closed container 300 and photochemical catalyst reaction generating means 200, therefore by having at refrigerating box, cutlery box etc. in the container of seal to a certain degree, take in photochemical catalyst reaction generating means 200, the freshness that can suppress food reduces.In addition, the photochemical catalyst using can also be reacted to generating means 200 for other closed container 300 in some closed containers 300, easy to use.In addition, closed container 300 does not need to have air-tightness completely.As long as have gas (food gas, carbon dioxide etc.) can not be inside and outside container the air-tightness of the degree of free flow.The container that air-tightness is higher, more can improve gas concentration lwevel efficiently, and the freshness that more can suppress food reduces.

In addition, the structure of photochemical catalyst portion 210 is not limited to tubular.So long as can arrive photocatalyst layer 212 from the gas of food etc., the carbon dioxide producing at photocatalyst layer 212 can be to the structure of Food circulation.For example, also can be configured to honeycomb shape, there is the sphere-like of peristome.

［ embodiment 5 ］

Use Figure 32 that the 5th embodiment is described.The photochemical catalyst reaction generating means 200 of the present embodiment is configured to device of solar generating by power supply unit 230.The power supply unit 230 that is configured to device of solar generating is for example arranged on the outside of the lid 301 of closed container 300.By perforation, cover 301 electric wires 231 that arrange, power supply unit 230 and light source portion 210 are connected.Electric wire 231 is installed on and covers 301 across seal members (not shown) such as O type rings.Can switch 232 be set at power supply unit 230, also timer can be set.In addition, power supply unit 230 can also have dry cell, battery etc. as accessory power supply.

Also the suction pump 310 of hand can be set in closed container 300.Suction pump 310 is installed on the main body of closed container 300 or covers 301 across seal members (not shown) such as O type rings.Closing cap 301 after user is interior to closed container 300 by food preservation, manual operation suction pump 310.Thus, the air in closed container 300 is sucked and discharges in atmosphere.Light source portion 210 is lighted before can reducing pressure in utilizing 310 pairs of closed containers 300 of suction pump, or also can after decompression, light.In addition, also suction pump 310 can be configured to the battery type suction pump that utilization is moved from the power supply of power supply unit 230.

The present embodiment forming so also can be realized the effect identical with the 4th embodiment.And then, in the present embodiment, power supply unit 230 is configured to device of solar generating, even therefore in such place, ,Hai, desert, mountain, the freshness that also can suppress food reduces, easy to use.Also manual or DYN dynamic suction pump can be set in the example shown in the 4th embodiment.In the situation that electrodynamic type pump is set, by electric wire 232, power supply unit 230 and suction pump 310 are electrically connected to.Electric wire 232 can be arranged in closed container 300, also can be arranged on the surface of closed container 300, can also be arranged on the inside of the wall portion of closed container 300.

In addition, the invention is not restricted to above-mentioned embodiment.So long as those skilled in the art, just can carry out within the scope of the invention various appending or change etc.

For example, the structure shown in the 4th embodiment or the 5th embodiment, also can express as shown below.To the symbol of inscape mark, being the example of being convenient to understanding below, is not that the structure of following invention is limited to illustrated structure.

Express 1.

A kind of for there is the photochemical catalyst reaction generating means (200) of photochemical catalyst reaction in taking in the container of food, it comprises:

The photochemical catalyst portion (210) with photocatalyst layer (212);

For above-mentioned photocatalyst layer being irradiated to the light source portion (220) of light; With

For above-mentioned light source portion being supplied with to the power supply unit (230) of electric power.

Express 2.

As express photochemical catalyst as described in 1 reaction generating means, wherein, above-mentioned photochemical catalyst portion, above-mentioned light source portion and above-mentioned power supply unit are integrated, and discrepancy in said vesse relatively.

Express 3.

As express the photochemical catalyst reaction generating means as described in 1, and wherein, above-mentioned photochemical catalyst portion and above-mentioned light source portion are arranged on the inside of said vesse, and above-mentioned power supply unit is configured to the device of solar generating that utilizes solar power generation, is arranged on the outside of said vesse.

Express 4.

As express the reaction of the photochemical catalyst as described in any one generating means in 1～3, wherein, at said vesse, be provided with the aspirator (310) for aspirating and discharge the air of internal tank.

Claims

1. a refrigerator, it comprises the storeroom of taking in food, this refrigerator is characterised in that:

Described storeroom has closed structure,

The carbon dioxide that being provided with the carbon dioxide for making in described storeroom increases increases device.

2. refrigerator as claimed in claim 1, is characterized in that:

Described carbon dioxide increases device and is decomposed and produced carbon dioxide by the food gas that the food from being stored at described storeroom is produced.

3. refrigerator as claimed in claim 2, is characterized in that:

Described carbon dioxide increases device and comprises: light source; From the energy of the light of this light source incident, from described food gas, generate the photochemical catalyst of carbon dioxide with utilization.

4. refrigerator as claimed in claim 3, is characterized in that:

Have light-blocking member, this light-blocking member is for the irradiation of the food in suppressing from the light of described light source output to described storeroom.

5. the refrigerator as described in any one in claim 1～4, is characterized in that:

There is the decompressor for the pressure of described storeroom is reduced pressure.

6. refrigerator as claimed in claim 5, is characterized in that:

Utilize described decompressor to make the pressure decreased of described storeroom to authorized pressure, make described carbon dioxide increase device action.

7. the refrigerator as described in any one in claim 1～6, is characterized in that:

At least any one wall portion at described storeroom is provided with transparent window portion,

In described storeroom, the layer of described photochemical catalyst is arranged on the medial surface of described window portion,

In the outside of described window portion, described light source is arranged on described storeroom.

8. a food preservation method, it is for preserving food, and this food preservation method is characterised in that:

In container, take in food this container is airtight,

Utilize carbon dioxide to increase device the gas producing from described food decomposed and generation carbon dioxide,

The concentration of the carbon dioxide in described container is maintained higher than the gas concentration lwevel in atmosphere.

9. food preservation method as claimed in claim 8, is characterized in that:

Before described carbon dioxide increases device action, be used in the decompressor action that reduces the pressure in described closed container, make pressure decreased in described closed container to authorized pressure.