CN102889746B

CN102889746B - Refrigerator

Info

Publication number: CN102889746B
Application number: CN201210034260.1A
Authority: CN
Inventors: 草野慎太郎; 山胁信太郎; 菊地芳辉; 船山敦子
Original assignee: Hitachi Appliances Inc
Current assignee: Hitachi Global Life Solutions Inc
Priority date: 2011-07-20
Filing date: 2012-02-15
Publication date: 2015-04-01
Anticipated expiration: 2032-02-15
Also published as: JP2013024462A; JP5572599B2; KR101322590B1; KR20130011896A; CN102889746A

Abstract

The invention provides a refrigerator which judges the kind and status of foodstuffs on the basis of a detected gas and switches to an optimal storage temperature range, thereby improving the storage of foodstuffs. The refrigerator comprises a plurality of storage chambers inside a refrigerator body; storage chamber doors for opening and closing the storage chambers; and a gas sensor which performs the detection of the gas concentration of at least a part of the plurality of storage chambers. The gas sensor performs the detection of the gas concentration for at least twice at predetermined time intervals, and the change in the gas concentration is detected according to the difference between the first detection value and the second value, thereby judging the gas generated by the foodstuffs stored in the storage chambers.

Description

Refrigerator

Technical field

The present invention relates to refrigerator.

Background technology

Managing the freshness taking fresh food as typical food, not only in food manufacturer, catering trade, is also important in the family.But present situation is for calculating number of days based on the guarantor's taste phase specified by food manufacturer, shelf-life in the family, and the sensory evaluation of subjectivity according to the individual such as gloss, color, fragrance, judge whether to rot to manage.

In this context, propose the freshness management devices refrigerator of foodstuff storing being put into the visual field, as an example, be known to the device recorded in Japanese Unexamined Patent Publication 2002-195971 publication (patent document 1).

Patent document 1 describes the preservation state exporting the vegetables and fruits judged in vegetable compartment based on the electricity from gas detection sensor, and there is the device of the indication mechanism of its content of display, wherein, gas detection sensor to be located in vegetable compartment and to be detected the change in concentration of the composite gas composition that vegetables and fruits produce.Thus, before the freshness reduction of the vegetables and fruits in the vegetable compartment such as veterinary antibiotics, indication mechanism can be utilized to confirm preservation state, and the vegetables and fruits such as the vegetables of storage can be made to carry out preservation management in the inside without putrefaction of vegetable compartment.

Patent document 1: Japanese Unexamined Patent Publication 2002-195971 publication

But, in above-mentioned existing structure, due to the absolute value that the electricity output being arranged on the gas detection sensor in vegetable compartment is the gas concentration of output detections object space, therefore only the electricity of read sensor exports, and is difficult to judge to detect that the gas produced by food still detects the gas comprised in script air.

Further, after the food that will degenerate takes out, the gas of detected object also can not disappear from vegetable compartment completely, therefore cause the electricity being made gas detection sensor by the gas remained to export to produce and change.

Summary of the invention

Therefore, the present invention produces in view of the problem points of above-mentioned prior art, its object is to provide following refrigerator, that is, judge kind, the state of food according to the gas detected, and switches to optimum storage temperature section, improves food preservation thus.

In the present invention, for solving above-mentioned problem, the mechanism such as described in technical scheme is adopted.As an example, possess: the multiple storerooms in refrigerator main body; The door of storage room of the above-mentioned storeroom of opening and closing; And gas sensor, it detects gas concentration at least partially in above-mentioned multiple storeroom, above-mentioned gas sensor at least carries out the detection of twice gas concentration across the interval of stipulated time, and the increase and decrease situation of residual quantity to gas concentration according to primary detected value and secondary detected value detects.

According to the present invention, can provide following refrigerator, that is, this refrigerator judges kind, the state of food according to the gas detected, and switches to optimum storage temperature section, improves food preservation thus.

Accompanying drawing explanation

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

Fig. 2 is the sectional block diagram of the orlop space segment of the refrigerator shown in Fig. 1.

Fig. 3 is the front view of the back panel of the refrigerator shown in Fig. 1.

Fig. 4 is the control block diagram of the refrigerator of embodiments of the present invention.

Fig. 5 is the CO of certain illustrated embodiments of the present invention ₂the CO of sensor ₂the figure of concentration-output voltage.

Fig. 6 is the CO of the refrigerator of embodiments of the present invention ₂detect action record figure.

Fig. 7 is the action record figure representing that the sensor of the situation that temperature, humidity change in the action record shown in Fig. 6 exports.

Symbol description

1-refrigerator main body, 2-refrigerating chamber, 3, 4-refrigerating chamber, 5-vegetable compartment, 6-refrigerating-chamber door, 7, 8, 9-refrigerating chamber door, 10-vegetable compartment door, 11-outer container, case in 12-, 13-foam-thermal insulation, 14-compressor, 15-evaporimeter, 16-Air Blast fan, 24-seal storage room, 25 ~ 27-door compartment, 28-ice making water pump, 29-negative pressure pump, 30-back panel, 31-first cold gas exhausting outlet, 32-second cold gas exhausting outlet, 33-cold air return port, 34 ~ 36-next door, 37-cold air backward channel, 40-seal storage room main body, 41-damping unit, 42-temperature sensor, 43-heater, 44-temperature regulation section, 45-CO ₂sensor, 46-control device, 50-seal storage room door, 60-food service tray, 80-antioxidant content release box, 81-antioxidant.

Detailed description of the invention

The present invention possesses multiple storerooms in refrigerator main body, for the door of storage room of the above-mentioned storeroom of opening and closing and the gas sensor that detects gas concentration at least partially in above-mentioned multiple storeroom, the detection of twice gas concentration is at least carried out at the interval that above-mentioned gas sensor separates the stipulated time, and the increase and decrease situation of residual quantity to gas concentration according to primary detected value and secondary detected value detects.Namely, the gas sensor detecting gas concentration carries out the detection of twice gas concentration within a certain period of time, residual quantity according to primary detected value and secondary detected value relatively is detected the situation of the change of gas concentration, can detect thus to the gas produced by food.

And, multiple storeroom is possessed in refrigerator main body, for the door of storage room of the above-mentioned storeroom of opening and closing, and to the gas sensor that gas concentration at least partially in above-mentioned multiple storeroom detects, the maximum (Vamax) of the detected value of the above-mentioned gas sensor in the first stipulated time and the variable quantity of minimum of a value (Vamin) are the first variable quantity (Δ Va), within second stipulated time of above-mentioned first stipulated time after the stipulated time, the maximum (Vbmax) of detected value of the above-mentioned gas sensor of (Tb) is the second variable quantity (Δ Vb) with the variable quantity of minimum of a value (Vbmin), this first variable quantity (Δ Va) and the second variable quantity (Δ Vb) are compared, when above-mentioned second variable quantity is larger than above-mentioned first variable quantity (Δ Vb > Δ Va), judge that the above-mentioned gas concentration in above-mentioned storeroom rises.Thus, the precision that gas contained in the gas produced by food and script air is distinguished is improved.

Further, above-mentioned gas sensor detects the gas of the seal storage indoor that inhibit the movement of gas relative to outside therein.Thereby, it is possible to the gas produced by the reserve independently storing subregion is detected, thus improve accuracy of detection.

And, possesses the vavuum pump of externally being discharged by the gas of above-mentioned seal storage indoor, above-mentioned vavuum pump and above-mentioned gas sensor are accommodated in containing box, utilize above-mentioned vavuum pump to make the air release of above-mentioned seal storage indoor in above-mentioned containing box, and utilize above-mentioned gas sensor to detect above-mentioned gas.Thus, detect the gas of discharging along with the decompression action of storeroom, thus reduce the useless action of vavuum pump, power saving and effectively.

Further, possess the door on-off switch that the opening and closing situation of above-mentioned door of storage room is detected, after above-mentioned door on-off switch detects the closedown of above-mentioned door of storage room after the stipulated time, utilize gas sensor to carry out first time output detections action.Thus, within the time period that user does not carry out the opening and closing of refrigerator, carry out the detection of gas, thus reduce useless detection action and effectively.

And, possesses the door on-off switch that the opening and closing situation of above-mentioned door of storage room is detected, when utilizing after above-mentioned door on-off switch detects that above-mentioned door of storage room is closed, during the stipulated time before utilizing above-mentioned gas sensor to carry out first time output detections action, drive above-mentioned vavuum pump.Thus, within the time period that user does not carry out the opening and closing of refrigerator, carry out decompression action to go forward side by side the detection of promoting the circulation of qi body, thus reduce useless decompression action and detect action and become the control of real use state.

Further, above-mentioned gas sensor is according to CO ₂concentration and increase and decrease the CO of sensor detected value ₂sensor, to can be in semiconductor-type, solid electrolyte formula, infrared-type any one.Thus, improve foodstuff storing be whether vegetables distinguish precision.

Further, infer the reserve of above-mentioned storeroom according to the detected value of above-mentioned gas sensor, thus above-mentioned storeroom is switched to above-mentioned reserve the design temperature section that is suitable for.Thus, judge kind, the state of food according to the gas detected, and automatically switch to optimum storage temperature section, thus food preservation can be made to improve.

Below, accompanying drawing is used to be described in detail to each embodiment.

(embodiment 1)

First, with reference to Fig. 1 and Fig. 2, the structure of the refrigerator of the present embodiment is described.Wherein, Fig. 1 is the central longitudinal sectional view of the refrigerator of present embodiment, and Fig. 2 is the sectional block diagram of the orlop space segment of the refrigerator shown in Fig. 1.

Can be clear and definite from these figure, refrigerator is configured to possess refrigerator main body 1 and the multiple doors 6 ~ 9 be located at before it.Refrigerator main body 1 is made up of the outer container 11 of steel plate, resinous interior case 12 and the foamed polyurethane insulating material 13 be filled between them and/or vacuum heat insulation materials (not shown), in accompanying drawing, define multiple storeroom with the order of refrigerating chamber 2, refrigerating chamber 3,4 and vegetable compartment 5.In other words, be configured with refrigerating chamber 2 in the superiors' zoning, be configured with vegetable compartment 5 in orlop zoning respectively, and between refrigerating chamber 2 and vegetable compartment 5, be equipped with the refrigerating chamber 3,4 heat insulation with this two Room.Refrigerating chamber 2 and vegetable compartment 5 are storerooms of refrigerated storage temperature section, and refrigerating chamber 3,4 is storerooms of the cryogenic temperature section (being such as the temperature section of about-20 DEG C ~-18 DEG C) of less than 0 DEG C.These storerooms 2 ~ 5 are formed by next door 34,35,36 zoning.

As mentioned above, in order to the front openings portion of multiple storeroom 2 ~ 5 is inaccessible, respectively door 6 ~ 10 is set before refrigerator main body 1.Refrigerating-chamber door 6 is the doors in the front openings portion of inaccessible refrigerating chamber 2, refrigerating chamber door 7 is the doors in the front openings portion of inaccessible refrigerating chamber 3, refrigerating chamber door 9 is the doors in the front openings portion of inaccessible refrigerating chamber 4, and in addition, vegetable compartment door 10 is the doors in the front openings portion of inaccessible vegetable compartment 5.Further, refrigerating-chamber door 6 is made up of the double door splitting around formula, and refrigerating chamber door 7, refrigerating chamber door 9, vegetable compartment door 10 are made up of drawout door, and the container be configured in storeroom is drawn out of with extraction door simultaneously.

The refrigerator main body 1 of above-mentioned structure is provided with refrigerating circulatory device, this refrigerating circulatory device with compressor 14, condenser (not shown), capillary (not shown) and evaporimeter 15 and being again linked in sequence of compressor 14 and being formed.Compressor 14 and condenser are arranged in the Machine Room of the lower backside being located at refrigerator main body 1.The cooler that evaporimeter 15 is arranged on the rear being located at refrigerating chamber 3,4 is indoor, above the evaporimeter 15 of this cooler room, be provided with Air Blast fan 16.

The cold air cooled by evaporimeter 15, through cold air path not shown from here, is sent to each storerooms such as refrigerating chamber 2, refrigerating chamber 3,4 and vegetable compartment 5 by Air Blast fan 16.Specifically, the cold air utilizing Air Blast fan 16 to transport is via can the damper of opening and closing, wherein a part is sent to the storeroom of the refrigerated storage temperature section of refrigerating chamber 2 and vegetable compartment 5, and a remaining part is sent to the storeroom of the cryogenic temperature section of refrigerating chamber 3,4.

The cold air utilizing Air Blast fan 16 to be sent to each storeroom of refrigerating chamber 2, refrigerating chamber 3,4 and vegetable compartment 5 by cold air backward channel, is back to cooler room after cooling in each storeroom.Like this, the refrigerator of present embodiment has the looping construct of cold air, and, each storeroom 2 ~ 5 can be maintained suitable temperature.

Further, in refrigerating chamber 2, the mode that can pull down is provided with the shelf 17 ~ 20 that multilayer is made up of transparent resin plate.Undermost shelf 20 is set to contact with the back side of interior case 12 and two sides, thus goes out its underlying space, i.e. so-called orlop space 21 with superjacent air space zoning.Further, arrange multi-layer door shelf 25 ~ 27 in the inner side of each refrigerating-chamber door 6, these door compartments 25 ~ 27 are outstanding in refrigerating chamber 2 under being set to the state of closing at refrigerating-chamber door 6.Be provided with back panel 30 at the back side of refrigerating chamber 2, this back panel 30 forms the passage passed through for the cold air supplied by Air Blast fan 16.

Also as shown in Figure 2, orlop space 21 is respectively arranged with successively from the left side: for ice making water pot 22 from the ice-making disc the supply system frozen water to refrigerating chamber 3, for receive the food such as dessert drawer 23, by airtight for indoor (further reduce pressure) for keeping the freshness of food and carrying out long-term seal storage room 24 of preserving.Seal storage room 24 has the width narrower than the width of refrigerating chamber 2, and is configured to the flank abutment with refrigerating chamber 2.In addition, also as shown in the figure, the surrounding of this seal storage room 24 is surrounded by wall, door and is formed as sealing state, thus, the gas of its inside and the movement of outside gas can be suppressed.Further, by connecting the mechanism of decompressor, internal pressure can be reduced to the low pressure forced down than air.

Ice making water pot 22 and drawer 23 are configured at the rear of refrigerating-chamber door 6 (Fig. 1) in the left side of Fig. 2.Thus, only open the refrigerating-chamber door 6 in left side, just can extract ice making water pot 22 and drawer 23 out.Further, seal storage room 24 is configured at the rear of refrigerating-chamber door 6 on the right side of figure.Thus, under the state that seal storage room door 50 opens, by an action of being closed from open mode by the refrigerating-chamber door 6 on right side, seal storage room door 50 does not have to move to the position closing seal storage room 24 damagedly, thus can closing cold room door 6 yet.

In addition, in above-mentioned Fig. 1, these ice making water pots 22 and drawer 23 are positioned at the rear of the undermost door compartment 27 of refrigerating-chamber door 6, and seal storage room 24 is also positioned at the rear of the undermost door compartment 27 of refrigerating-chamber door 6.

Next, Fig. 3 is used to be described in detail to the back panel 30 shown in Fig. 1.This back panel 30 is provided with: the cold gas exhausting outlet (the first cold gas exhausting outlet) 31 that the refrigerating chamber of refrigerating chamber 2 cool-air feed is cooled; To the cold gas exhausting outlet (the second cold gas exhausting outlet) 32 that the seal storage room of orlop space 21 cool-air feed of refrigerating chamber 2 cools; And cold air return port 33.Cold air return port 33 be set to seal storage room 24 rear, the back side, be positioned at side, side near refrigerating chamber 2.

Further, cold gas exhausting outlet 32 is set to towards the gap between the upper surface of seal storage room 24 and the lower surface of shelf 20.Flow in gap between the upper surface of cold air in seal storage room 24 of discharging from cold gas exhausting outlet 32 and the lower surface of shelf 20, begin to cool down seal storage room 24 from upper surface.Thus, indirectly cool in seal storage room 24.

Further, be provided with damping unit 41 than cold gas exhausting outlet 32 upstream side, this damping unit 41 is for controlling the flowing to the cold air in seal storage room 24.The opening and closing of this damping unit 41 is controlled by not shown control device, thus, control to the cold air supply in seal storage room 24.

Further, as shown in Figure 1, for making the temperature in seal storage room 24 rise, such as, heater 43 is provided with.The perspective plane, below in seal storage room 24 is located at by this heater 43, in this example, makes the heater of the area of degree roughly the same with the bottom surface in seal storage room 24.

In addition, at this, seal storage room 24 is configured the gap on the right side of eliminating seal storage room 24 close to the right flank of refrigerating chamber 2, and the gap that the left upper portion of seal storage room 24 eliminated by not shown shelf (next door) is set in the left part of the upper surface of seal storage room 24, thus the cold air of being discharged by cooling outlet 32 is not shunted to the side of the left and right of seal storage room 24, and the upper surface flowing in seal storage room 24.Thus, by increasing the air conditioning quantity of the upper surface of cooling seal storage room 24, can cool fast in seal storage room 24.The cold air having cooled the upper surface of this seal storage room 24 is inhaled into cold air return port 33 from the front of seal storage room 24 by the left surface of seal storage room 24, and returns to cooler room by cold air backward channel.The rear, the back side being arranged in seal storage room 24 due to cold air return port 33 is positioned at the side, side near refrigerating chamber 2, thus the back side of cold air and seal storage room 24 and left surface contact and cool.

Like this, utilization makes cold air indirectly cool seal storage room 24 by the outside of seal storage room 24.Thus, the convection current of cold air is suppressed by making decompression state, and by indirectly cooling in closed container, even if thus rise relative to the temperature opened or disconnect the impact, the opening and closing of door of refrigerator or defrosting etc. that cause by compressor, also the harmful effect to its internal temperature can be suppressed, and then, can constant temperature be kept and the state of high humidity.In addition, the cold air of the entirety of refrigerated compartment 2 is also inhaled into cold air return port 33.

Further, the rear of ice making water pot 22 is provided with ice making water pump 28.The space of the side, rear portion at the rear of drawer 23 and in seal storage room 24, is configured with the negative pressure pump 29 of the example as the decompressor for reducing pressure to seal storage room 24.This negative pressure pump 29 is accommodated in containing box (not shown), except negative pressure pump 29 is also accommodated with CO in containing box ₂sensor 45 (not shown), this CO ₂sensor 45 is according to the CO of surrounding ₂concentration changes its electricity and exports.In the present embodiment, utilize negative pressure pump 29 to attract the air in seal storage room 24, and make this air to the CO in containing box ₂the periphery diffusion of sensor 45, CO ₂the electricity of sensor 45 exports and carries out detection action when negative pressure pump 29 is connected.Further, negative pressure pump 29 is connected via the pump connecting portion of conduit with the side being located at seal storage room 24.

Further, as shown in Figure 2, above-mentioned seal storage room 24 is configured to be possessed: the seal storage room main body 40 of the box like of the opening portion (food discrepancy opening portion) that the taking-up with food is put into; For the seal storage room door 50 of the food discrepancy opening portion of opening and closing seal storage room main body 40; And food service tray 60, food is accommodated in its inside by it, and is taken out in seal storage room 24 by seal storage room door 50 or put in seal storage room 24.That is, in seal storage room main body 40, closing food discrepancy opening portion by its seal storage room door 50, reduces pressure and is formed as low-voltage space in the space surrounded by seal storage room main body 40 and seal storage room door 50.In addition, food service tray 60 is installed on the rear side of seal storage room door 50, and can move forward and backward along with the movement of seal storage room door 50.

Further, antioxidant content release box 80 is provided with in the inside of seal storage room 24, containing antioxidant 81 (not shown) in this antioxidant content release box 80.In other words, in the seal storage room 24 of preserving the fresh food such as vegetables, meat or fish, be provided with antioxidant content release box 80, this antioxidant content release box 80 includes the antioxidant 81 for preventing the oxidational losses caused by the oxygen in the air of its inside.As shown in Figure 2, this antioxidant content release box 80 is the mode of dismounting can mount back wall portion in food service tray 60.As antioxidant 81, cannot antioxidant content be discharged under being used in atmospheric state and the antioxidant of antioxidant content can be discharged under subatmospheric state.Namely, for the antioxidant 81 that antioxidant content release box 80 includes, by reducing pressure in seal storage room 24, thus the pressure differential utilizing antioxidant content to discharge between pressure that the pressure of inside of box 80 and antioxidant content discharge the outside of box 80 is to discharge antioxidant content.

So, for seal storage room 24, place food at its food service tray 60 and close seal storage room door 50, thus make its inside become air-tight state, further, be switched on the door on-off switch that the opening and closing situation of refrigerating-chamber door detects and drive negative pressure pump 29, seal storage room 24 is decompressed to the state forced down than air.Thus, the oxygen concentration in seal storage room 24 reduces and can prevent the deterioration of the nutritional labeling in food.

And, airtight and after becoming decompression state in seal storage room 24, by discharging antioxidant content from antioxidant 81, in the seal storage room 24 of its volume limited, antioxidant content can be utilized to prevent nutritional labeling in food and combination with oxygen.Its result, the antioxidant content release miniaturization of box 80, the miniaturization of negative pressure pump 29 can be realized, the intensity of the basket of seal storage room 24 can be reduced further, increase and the cost that can realize food storing space reduce, and can prevent the oxidative degradation of the nutritional labeling in the food of the inside being accommodated in seal storage room 24 for a long time.

So, if by seal storage room door 50 to nearby pulling out, be then first located at the pressure releases valve events of a part for seal storage room door 50 and remove the decompression state of seal storage room 24, its result, become atmospheric state, thus seal storage room door 50 can be opened.Thereby, it is possible to open simply seal storage room door 50, take out put into food.

Next, Fig. 4 is used to be described the controlling organization that the temperature of the refrigerator of the present embodiment switches.Wherein, this Fig. 4 be the refrigerator that the present embodiment is described controlling organization, represent the control block diagram of the brief configuration of this controlling organization.

In figure, such as, the control device 46 be made up of microcomputer etc. using the temperature detected by the temperature sensor 42 of temperature detecting refrigerating chamber 2 and the temperature set by the temperature regulation section 44 that can switch its temperature in ice temperature section and preservation temperature section as input, and based on these temperature, export control signal to damping unit 41 and heater 43.

More specifically, when the detected temperatures of temperature sensor 42 is lower than a certain fiducial temperature A, the aperture of damping unit 41 is diminished, or closes completely, thus air conditioning quantity is controlled (suppression).Further, when temperature is too low, heater 43 is made to be energized and to make temperature increase.

When the detected temperatures of temperature sensor 42 is higher than fiducial temperature A, makes the aperture of damping unit 41 become large, to the cold air free air space cool-air feed in seal storage room 24, the temperature in seal storage room 24 is declined.

Further, except " setting of ice temperature section " and " preservation temperature section sets ", temperature regulator 44 can also set " automatic mode " of the switching automatically carrying out ice temperature section and preservation temperature section, and the switching of the storage temperature section of food is based on CO ₂the electricity of sensor 45 exports and decides.

First, when being accommodated with vegetables in seal storage room 24, make the CO in seal storage room 24 due to the respiration of vegetables ₂concentration rises, and in addition, is connected the air in seal storage room 24 is guided in containing box by negative pressure pump 29, and to CO ₂the periphery diffusion of sensor 45, thus CO ₂the electricity of sensor 45 exports and reduces.Due to the CO when preserving meat or fish ₂concentration does not change substantially, and thus electricity exports and do not change.

This characteristic is utilized to control as follows, at CO ₂when the electricity of sensor 45 exports and reduces, judge preserve vegetables and automatically switch to preservation temperature section, under electricity exports indeclinable situation, judge to preserve meat or fish and automatically switch to ice temperature section.

Below, use Fig. 5, Fig. 6 to by CO ₂sensor 45 detects that the control mode of the situation being accommodated with vegetables in seal storage room 24 is described.

First, as shown in Figure 5, CO ₂sensor 45 is the use of the CO according to surrounding ₂concentration (ppm) carry out 0 ~ 5V electricity export semiconductor-type CO ₂the module of sensor, such as, CO in seal storage room 24 ₂when concentration is Cx [ppm], from CO ₂sensor 45 output voltage Vx [V].

According to the value of this voltage Vx, control device 46 is configured to detect the CO in seal storage room 24 ₂concentration carries out temperature control, but mixing has the CO contained in script air in seal storage room 24 ₂, the CO to be produced by food ₂, contained in the expiration of people that enters when receiving food CO ₂deng.Therefore, only measure voltage Vx, the CO only produced by food cannot be measured ₂, thus received food cannot be concluded.

The action record shown in Fig. 6 is utilized to be described for solution to the problems described above.First, when refrigerating-chamber door 6 from open become close time, judge be accommodated with food, after the stipulated time, vavuum pump is connected the Ta time, the minimum of a value of the voltage now detected is set to Va.Further, the CO in the seal storage room 24 now detected ₂concentration C a is the CO contained in air ₂or the CO that the expiration etc. of the people flowed into during storage is contained ₂, be not the CO produced by food detected purely ₂.

Afterwards, every the T1 time, again negative pressure pump 29 is connected the Tb time, the minimum of a value of the voltage now detected is set to Vb.At this, when being accommodated with vegetables in seal storage room 24, during T1 due to the respiration of vegetables the CO of inside ₂concentration rises.On the other hand, CO is not produced preserving meat or fish etc. ₂food when, CO ₂concentration does not change substantially.That is, can make the following judgment in control device 46 inside, be accommodated with meat or fish as Vb=Va, be accommodated with vegetables as Va > Vb.

Further, represent by Va-Vb the CO that food produces ₂concentration, the larger then CO of value of Va-Vb ₂the climbing of concentration is higher.That is, can judge to be accommodated with more vegetables.

By above control, carry out twice detection action every the interval of T1 time, thus can only detect the CO produced by food ₂, and carry out the judgement of food.

(embodiment 2)

Just be applied to the semiconductor-type CO of the refrigerator illustrated in embodiment 1 ₂sensor, transducer sensitivity along with the temperature around sensor, humidity and changing, can cause electricity to export and also changes.

Therefore, as shown in Figure 7, if temperature, humidity change, then there is following situation, although CO ₂concentration increases, but primary measured value Va and secondary measured value Vb is also close value, thus makes CO ₂the error detection that concentration does not rise.

So, even if the CO in seal storage room 24 also correctly can be measured when changing to temperature around, humidity ₂the method of concentration carries out describing.

First, in during Ta, to CO ₂maximum Vamax and the minimum of a value Vamin of the electricity output of sensor 45 measure.Temperature in during the variation delta Va (Vamax-Vamin) that electricity now exports can be described as Ta, the CO under damp condition ₂the detected value of concentration.

Similarly, in during Tb, to CO ₂maximum Vbmax and the minimum of a value Vbmin of the electricity output of sensor 45 measure.Temperature in during the variation delta Vb (Vbmax-Vbmin) that electricity now exports can be described as Tb, the CO under damp condition ₂the detected value of concentration.

At this, because Δ Va and Δ Vb is the measured value in respective mensuration environment, therefore eliminate Yin Wendu, the impact of humidity and change that the electricity that causes exports, thus can catch because of CO ₂the increase and decrease of concentration and change that the electricity that causes exports.

Thus, when Δ Va=Δ Vb, can judge preserve meat or fish in seal storage room 24 or do not preserve anything.In addition, when Δ Vb > Δ Va, the CO in seal storage room 24 in during T1 is judged ₂concentration rises, that is, can judge to be accommodated with vegetables.

That is, the CO of the first stipulated time interior (Ta) ₂the maximum (Vamax) of the detected value of sensor and the variable quantity of minimum of a value (Vamin) are the first variable quantity (Δ Va), from the first stipulated time CO of (Tb) within second stipulated time of stipulated time ₂the maximum (Vbmax) of the detected value of sensor and the variable quantity of minimum of a value (Vbmin) are the second variable quantity (Δ Vb), this first variable quantity (Δ Va) and the second variable quantity (Δ Vb) are compared, as the second variable quantity larger than the first variable quantity (Δ Vb > Δ Va), judge the CO in seal storage room 24 ₂concentration rises, thus judges to be accommodated with vegetables.Further, the control of switching temperature can be carried out, to make suitable temperature section cooling preservation vegetables.

By above control, CO can be improved further ₂accuracy of detection.

Claims

1. a refrigerator, is characterized in that,

Possess: the multiple storerooms in refrigerator main body; The door of storage room of storeroom described in opening and closing; And gas sensor, it detects gas concentration at least partially in described multiple storeroom,

The gas of described gas sensor to seal storage indoor detects, and this seal storage room makes its inside inhibit the movement of gas relative to outside,

Possesses the vavuum pump of externally being discharged by the gas of described seal storage indoor, described vavuum pump and described gas sensor are accommodated in containing box, utilize described vavuum pump that the gas of described seal storage indoor is discharged in described containing box, and utilize described gas sensor to detect described gas

Described gas sensor at least carries out the detection of twice gas concentration across the interval of stipulated time, and the increase and decrease situation of residual quantity to gas concentration according to primary detected value and secondary detected value detects.

2. a refrigerator, is characterized in that,

The maximum (Vamax) of the detected value of the described gas sensor in the first stipulated time and the variable quantity of minimum of a value (Vamin) are the first variable quantity (△ Va), within second stipulated time of described first stipulated time after the stipulated time, the maximum (Vbmax) of detected value of the described gas sensor of (Tb) is the second variable quantity (△ Vb) with the variable quantity of minimum of a value (Vbmin), this first variable quantity (△ Va) and the second variable quantity (△ Vb) are compared, when described second variable quantity is larger than described first variable quantity (△ Vb > △ Va), judge that the described gas concentration in described storeroom rises.

3. refrigerator according to claim 1 and 2, is characterized in that,

Possess the door on-off switch of the opening and closing detecting described door of storage room, from described door on-off switch detect described door of storage room be after closed condition after the stipulated time, utilize described gas sensor to carry out primary output detections action.

4. refrigerator according to claim 1 and 2, is characterized in that,

Possesses the door on-off switch of the opening and closing detecting described door of storage room, described door of storage room is for after closed condition to utilize described door on-off switch to detect, within the stipulated time utilizing described gas sensor to carry out before primary output detections action, drive described vavuum pump.

5. refrigerator according to claim 1 and 2, is characterized in that,

Described gas sensor is according to CO ₂the CO that concentration makes sensor detected value increase and decrease ₂sensor, and be in semiconductor-type, solid electrolyte formula, infrared-type any one.

6. refrigerator according to claim 1 and 2, is characterized in that,

Estimate the reserve of described storeroom according to the detected value of described gas sensor, thus described storeroom is switched to the design temperature section being suitable for described reserve.