JP5572599B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator.

  Managing the freshness of foods, typically fresh food, is important at home, regardless of food manufacturer or restaurant industry. However, at home, the number of days is calculated based on the expiration date and expiry date specified by the food manufacturer, and it is determined whether or not it is corrupt by subjective sensory evaluation of each person such as gloss, color, and fragrance. It is currently managed.

  In such a background, a freshness management device with a view to a refrigerator for storing food has been proposed, and an example described in JP 2002-195971 A (Patent Document 1) is known. .

  Patent document 1 determines the preservation | save state of the fruit and vegetables in a vegetable room based on the electrical output from the gas detection sensor which installs in a vegetable room and senses the density | concentration change of the composite gas component which generate | occur | produces from fruit and vegetables, and displays the content It has a display means. Thereby, before the freshness of vegetables and fruits such as vegetables and fruits decreases, the storage state can be confirmed by the display means, and the fruits and vegetables such as stored vegetables can be stored and managed in the interior of the vegetable room without being spoiled.

JP 2002-195971 A

  However, in the above-described conventional configuration, the electrical output of the gas detection sensor installed in the vegetable compartment is output with respect to the absolute value of the gas concentration in the detection target space, so the electrical output of the sensor is read. It is difficult to determine whether the gas emitted from the food has been detected or whether the gas originally contained in the atmosphere has been detected.

  In addition, even after the deteriorated food is taken out, the gas to be detected is not completely removed from the vegetable compartment, and the electrical output of the gas detection sensor fluctuates due to the remaining gas.

  Therefore, the present invention has been made in view of the above problems in the prior art, and by determining the type and state of the food based on the detected gas and switching to the optimum storage temperature range, the food storage stability is improved. The purpose is to provide a refrigerator.

In the present invention, in order to solve the above-described problems, for example, means described in the claims are adopted. As an example, the refrigerator main body includes a plurality of storage chambers, a storage chamber door that opens and closes the storage chamber, and a gas sensor that detects a gas concentration of at least a part of the plurality of storage chambers, and the gas sensor includes the interior thereof. It is configured to detect a gas in a sealed storage chamber that suppresses gas movement relative to the outside, and includes a vacuum pump that discharges the gas in the sealed storage chamber to the outside. The vacuum pump and the gas sensor are stored in a storage case. And the gas sensor detects the gas by releasing the gas in the sealed storage chamber into the storage case with the vacuum pump, and the gas sensor detects the gas concentration at intervals of a predetermined time. This is performed at least twice, and the increase / decrease in gas concentration is detected based on the difference between the first detection value and the second detection value.

  ADVANTAGE OF THE INVENTION According to this invention, the kind and state of a foodstuff are determined with the detected gas, and the refrigerator which improved food preservation | save property can be provided by switching to the optimal preservation | save temperature range.

It is a center longitudinal cross-sectional view of the refrigerator in embodiment of this invention. It is a cross-sectional perspective view of the lowermost space part of the refrigerator compartment shown in FIG. It is a front view of the back panel of the refrigerator compartment shown in FIG. It is a control block diagram of the refrigerator in the embodiment of the present invention. CO ₂ concentration of the CO ₂ sensor in the embodiment of the present invention - is a diagram illustrating the output voltage specified. A CO ₂ detecting operation chart of the refrigerator in an embodiment of the present invention. FIG. 7 is an operation chart showing sensor output when temperature and humidity change in the operation chart shown in FIG. 6.

  The present invention comprises a refrigerator body comprising a plurality of storage rooms, a storage room door for opening and closing the storage room, and a gas sensor for detecting a gas concentration of at least a part of the plurality of storage rooms, the gas sensor comprising a gas concentration Is detected at least twice with a predetermined time interval, and an increase or decrease in gas concentration is detected based on the difference between the first detection value and the second detection value. That is, the gas sensor that detects the gas concentration performs the gas concentration detection twice at a fixed time, and relatively detects the change in the gas concentration by the difference between the first detection value and the second detection value, Gas emitted from food can be detected.

  The refrigerator main body includes a plurality of storage chambers, a storage chamber door that opens and closes the storage chamber, and a gas sensor that detects a gas concentration of at least a part of the plurality of storage chambers, and is within a first predetermined time. The first change amount (ΔVa) of the maximum value (Vamax) and minimum value (Vamin) of the detection value of the gas sensor, and the second predetermined time (Tb) after a predetermined time has elapsed from the first predetermined time. When the second change amount (ΔVb) of the maximum value (Vbmax) and minimum value (Vbmin) of the detection value of the gas sensor is compared, and the second change amount is larger than the first change amount (ΔVb > ΔVa), it is determined that the gas concentration in the storage chamber is increasing. Thereby, the precision which distinguishes the gas emitted from the foodstuff and the gas originally contained in air | atmosphere improves.

  In addition, the gas sensor detects a gas in the sealed storage chamber in which the movement of the gas is suppressed from the inside to the outside. Thereby, the gas emitted from the store of the independent storage division can be detected, and detection accuracy improves.

  A vacuum pump for discharging the gas in the sealed storage chamber to the outside, and the vacuum pump and the gas sensor are housed in a storage case, and the gas in the sealed storage chamber is discharged into the storage case by the vacuum pump; The gas is detected by the gas sensor. As a result, since the gas exhausted accompanying the decompression operation of the storage chamber is detected, the wasteful operation of the vacuum pump is reduced, which saves power and is efficient.

  In addition, a door opening / closing switch for detecting opening / closing of the storage chamber door is provided, and a first output detection operation is performed by the gas sensor after a predetermined time from when the door opening / closing switch detects the closing of the storage chamber door. Thereby, since a gas is detected in the time slot | zone when the user is not opening and closing a refrigerator, useless detection operation reduces and it is efficient.

  And a door opening / closing switch for detecting opening / closing of the storage chamber door, and after the door opening / closing switch detects the closing of the storage chamber door, during a predetermined time before performing the first output detection operation by the gas sensor. The vacuum pump is driven. As a result, since the decompression operation is performed and the gas is detected while the user is not opening and closing the refrigerator, the wasteful decompression operation and the detection operation are reduced, and the actual use state is achieved.

Further, the gas sensor is a CO ₂ sensor the sensor detection value is increased or decreased by the CO ₂ concentration, semiconductor type, solid electrolyte type, either via infrared. Thereby, the discrimination | determination precision whether the stored food is a vegetable improves.

  Moreover, the store of the said store room is estimated with the detected value of the said gas sensor, and the said store room is switched to the setting temperature range suitable for the said store. Thereby, the kind and state of food are determined by the detected gas, and the food storage stability can be improved by automatically switching to the optimal storage temperature range.

  Hereinafter, each embodiment will be described in detail with reference to the drawings.

Example 1
First, the configuration of the refrigerator of this embodiment will be described with reference to FIGS. 1 and 2. 1 is a central longitudinal sectional view of the refrigerator according to the present embodiment, and FIG. 2 is a sectional perspective view of the lowermost space portion of the refrigerator compartment shown in FIG.

  As is clear from these drawings, the refrigerator includes a refrigerator body 1 and a plurality of doors 6 to 9 provided on the front surface thereof. The refrigerator body 1 is composed of a steel plate outer box 11, a resin inner box 12, a urethane foam heat insulating material 13 and / or a vacuum heat insulating material (not shown) filled therebetween, From the top of the figure, a plurality of storage rooms are formed in the order of the refrigerator compartment 2, the freezer compartments 3 and 4, and the vegetable compartment 5. In other words, the refrigerator compartment 2 is arranged at the top and the vegetable compartment 5 is divided and arranged at the bottom, and both the compartments are provided between the refrigerator compartment 2 and the vegetable compartment 5. Freezer compartments 3 and 4 that are thermally partitioned from each other are disposed. The refrigerator compartment 2 and the vegetable compartment 5 are storage compartments in a refrigeration temperature zone, and the freezer compartments 3 and 4 are storage compartments in a freezing temperature zone of 0 ° C. or lower (for example, a temperature zone of about −20 ° C. to −18 ° C.). It is. These storage chambers 2 to 5 are partitioned by partition walls 34, 35, and 36.

  As described above, doors 6 to 10 are provided on the front surface of the refrigerator body 1 in order to close the front opening portions of the plurality of storage chambers 2 to 5, respectively. The freezer compartment door 6 closes the front opening of the freezer compartment 2, the freezer compartment door 7 closes the front opening of the freezer compartment 3, and the freezer compartment door 9 closes the front opening of the freezer compartment 4. The vegetable compartment door 10 is a door that closes the front opening of the vegetable compartment 5. The refrigerator compartment door 6 is a double door with double doors, and the freezer compartment door 7, the freezer compartment door 9, and the vegetable compartment door 10 are constructed with drawer doors. The structure is drawn out.

  The refrigerator body 1 having the above-described structure is provided with a refrigeration cycle. This refrigeration cycle includes a compressor 14, a condenser (not shown), a capillary tube (not shown) and an evaporator 15, and again a compressor 14 connected in that order. The compressor 14 and the condenser are installed in a machine room provided at the lower back of the refrigerator body 1. The evaporator 15 is installed in a cooler room provided behind the freezing rooms 3 and 4, and a blower fan 16 is installed above the evaporator 15 in the cooler room.

  The cold air cooled by the evaporator 15 is sent to each storage room such as the refrigerator compartment 2, the freezer compartments 3, 4 and the vegetable compartment 5 by the blower fan 16 through a cold air passage (not shown). Specifically, a part of the cold air sent by the blower fan 16 is sent to a storage room in the refrigeration temperature zone of the refrigeration room 2 and the vegetable room 5 via a damper that can be opened and closed. The part is sent to the freezer compartment 3 and the storage compartment of the freezing temperature zone.

  The cool air sent to the storage rooms of the refrigerator compartment 2, the freezer compartments 3 and 4 and the vegetable compartment 5 by the blower fan 16 is returned to the cooler compartment through the cool air return passage after cooling each storage compartment. . Thus, the refrigerator which becomes this Embodiment has the circulation structure of cold air, and maintains each store room 2-5 at a suitable temperature.

  Moreover, in the refrigerator compartment 2, the multistage shelf 17-20 comprised with a transparent resin board is installed so that removal is possible. The lowermost shelf 20 is installed so as to be in contact with the back surface and both side surfaces of the inner box 12 and divides a so-called lowermost space 21, which is a lower space, from the upper space. Further, a plurality of door pockets 25 to 27 are installed inside each refrigerator compartment door 6, and these door pockets 25 to 27 protrude into the refrigerator compartment 2 with the refrigerator compartment door 6 being closed. It is provided as follows. A back panel 30 that forms a passage through which the cool air supplied from the blower fan 16 passes is provided on the back of the refrigerator compartment 2.

  As is apparent from FIG. 2, in the lowermost space 21, in order from the left, an ice making water tank 22 for supplying ice making water to the ice making tray in the freezer compartment 3, and a drawer case for storing food such as dessert 23, each is provided with a sealed storage chamber 24 for keeping the room sealed (and reducing the pressure) to keep the food fresh and storing it for a long time. The sealed storage room 24 has a width that is narrower than the width of the refrigerating room 2, and is disposed adjacent to the side surface of the refrigerating room 2. As is apparent from the figure, the sealed storage chamber 24 is formed so as to be hermetically surrounded by a wall or a door, and therefore, the movement of the internal gas and the external gas can be suppressed. it can. Furthermore, the internal pressure can be made lower than the atmospheric pressure by connecting the pressure reducing means.

  The ice making water tank 22 and the drawer case 23 are arranged behind the refrigerator compartment door 6 (FIG. 1) on the left side of FIG. Thereby, the ice making water tank 22 and the drawer case 23 can be pulled out only by opening the left refrigerator compartment door 6. Moreover, the sealed storage room 24 is arrange | positioned in the back of the refrigerator compartment door 6 in the right side of a figure. Accordingly, when the closed storage room door 50 is open, the closed storage room door 50 moves to the position where the closed storage room 24 is closed without being damaged by one operation of closing the right refrigerator compartment door 6 from the opened state. The refrigerator compartment door 6 can also be closed.

  The ice making water tank 22 and the drawer case 23 are located behind the lowermost door pocket 27 of the refrigerator compartment door 6 in FIG. 1, and the sealed storage chamber 24 is also located at the lowermost portion of the refrigerator compartment door 6. It will be located behind the door pocket 27.

  Next, details of the rear panel 30 shown in FIG. 1 will be described with reference to FIG. The rear panel 30 includes a cold air discharge port (first cold air discharge port) 31 for supplying cold air to the refrigerating chamber 2 and a sealed storage chamber for supplying cold air to the lowermost space 21 of the refrigerating chamber 2. A cooling air discharge port (second cold air discharge port) 32 for cooling and a cold air return port 33 are provided. The cold air return port 33 is provided on the rear side of the closed storage chamber 24 on the side close to the side surface of the refrigerator compartment 2.

  Further, the cold air discharge port 32 is provided toward the gap between the upper surface of the sealed storage chamber 24 and the lower surface of the shelf 20. The cold air discharged from the cold air discharge port 32 flows through the gap between the upper surface of the sealed storage chamber 24 and the lower surface of the shelf 20, and cools the sealed storage chamber 24 from the upper surface. Therefore, the inside of the sealed storage chamber 24 is indirectly cooled.

  In addition, a damper device 41 for controlling the flow of cold air into the sealed storage chamber 24 is provided on the upstream side of the cold air discharge port 32. The opening and closing of the damper device 41 is controlled by a control device (not shown), and thereby the amount of cold air supplied to the sealed storage chamber 24 is controlled.

  Further, as shown in FIG. 1, for example, a heater 43 is provided in order to increase the temperature in the sealed storage chamber 24. The heater 43 is provided on a lower projection surface in the sealed storage chamber 24. In this example, the heater 43 has a surface area approximately the same as the bottom surface in the sealed storage chamber 24.

  Here, the sealed storage chamber 24 is arranged close to the right side surface of the refrigerator compartment 2 to eliminate the gap on the right side of the sealed storage chamber 24, and a shelf (not shown) is provided at the left end of the upper surface of the sealed storage chamber 24. Since the partition wall is provided to eliminate the gap on the upper left side of the sealed storage chamber 24, the cold air discharged from the cold air discharge port 32 is not stored in the sealed storage chamber 24 without being divided into the left and right sides. It flows on the upper surface of the chamber 24. Thereby, the inside of the sealed storage chamber 24 can be cooled quickly by increasing the amount of cool air that cools the upper surface of the sealed storage chamber 24. The cold air that has cooled the upper surface of the closed storage chamber 24 is sucked into the cold air return port 33 from the front of the closed storage chamber 24 through the left side surface of the closed storage chamber 24, and returned to the cooler chamber through the cold air return passage. It is. Since the cold air return port 33 is provided on the rear side of the closed storage chamber 24 and on the side close to the side surface of the refrigerator compartment 2, the cold air contacts the back surface and the left side surface of the closed storage chamber 24 and cools it.

  Thus, the sealed storage chamber 24 is indirectly cooled by passing cold air outside. Therefore, by reducing the convection of the cold air by reducing the pressure, and by indirectly cooling in the sealed container, the effects of the compressor on / off and the temperature rise such as opening / closing the refrigerator door and defrosting However, the adverse effect on the internal temperature can be suppressed, and the constant temperature and high humidity can be maintained. The cold air that has cooled the entire refrigerator compartment 2 is also sucked into the cold air return port 33.

An ice making water pump 28 is installed behind the ice making water tank 22. A negative pressure pump 29, which is an example of a decompression device for decompressing the sealed storage chamber 24, is disposed in the space behind the drawer case 23 and behind the sealed storage chamber 24. The negative pressure pump 29 is accommodated in a storage case (not shown). In addition to the negative pressure pump 29, the CO ₂ sensor 45 whose electrical output changes depending on the concentration of ambient CO ₂ is contained in the storage case. (Not shown) is accommodated. In the present embodiment, the air in the sealed storage chamber 24 and sucked by the negative pressure pump 29 is arranged to diffuse around the CO ₂ sensor 45 in the housing case, the electrical output of the CO ₂ sensor 45 Performs a detection operation when the negative pressure pump 29 is turned on. The negative pressure pump 29 is connected to a pump connection portion provided on the side surface of the sealed storage chamber 24 via a conduit.

  Further, as shown in FIG. 2, the above-described sealed storage chamber 24 includes a box-shaped sealed storage chamber main body 40 having an opening for taking in and out food (opening portion for taking in and out food), and a closed storage chamber main body 40. A closed storage chamber door 50 that opens and closes the opening / closing opening for food and a food tray 60 that stores food in the closed storage chamber 24 through the closed storage chamber door 50 and into / out of the closed storage chamber 24 are provided. That is, in the closed storage chamber main body 40, as a low-pressure space in which the space surrounded by the closed storage chamber main body 40 and the closed storage chamber door 50 is depressurized by closing the food storage opening / closing opening of the closed storage chamber door 50. It is formed. The food tray 60 is attached to the back side of the sealed storage room door 50 and can be moved back and forth with the movement of the closed storage room door 50.

  In addition, an antioxidant component release cassette 80 containing an antioxidant 81 (not shown) is installed inside the sealed storage chamber 24. In other words, in the sealed storage chamber 24 for storing fresh food such as vegetables, meat and fish, an antioxidant component release cassette 80 containing an antioxidant 81 for preventing oxidative loss due to oxygen in the air inside. Is installed. As shown in FIG. 2, the antioxidant component release cassette 80 is detachably attached to the back wall portion of the food tray 60. As the anti-oxidant 81, an anti-oxidant that does not release the anti-oxidant component under the atmospheric pressure group and releases the anti-oxidant component under the pressure state lower than the atmospheric pressure is used. That is, the antioxidant 81 contained in the antioxidant component release cassette 80 reduces the pressure inside the sealed storage chamber 24 to reduce the pressure inside the antioxidant component release cassette 80 and the pressure outside the antioxidant component release cassette 80. The antioxidant component is released by the pressure difference.

  And the closed storage chamber 24 puts food on the food tray 60 and closes the closed storage chamber door 50 so that the inside thereof is in a sealed state, and a door opening / closing switch for detecting the opening / closing of the refrigerator compartment door is turned on. Then, the negative pressure pump 29 is driven, and the sealed storage chamber 24 is depressurized to a state lower than the atmospheric pressure. Thereby, the oxygen concentration in the sealed store room 24 can be reduced, and deterioration of nutritional components in the food can be prevented.

  Moreover, since the release of the antioxidant component from the antioxidant 81 is started after the sealed storage chamber 24 is sealed and decompressed, in the sealed storage chamber 24 of the limited volume, It is possible to prevent the binding of nutrients and oxygen in foods due to antioxidant components. As a result, the antioxidant component release cassette 80 can be downsized, the negative pressure pump 29 can be downsized, the strength of the casing of the sealed storage chamber 24 can be reduced, and the food storage space can be increased and the cost can be reduced. It is possible to prevent oxidative deterioration of nutritional components in food stored in the closed storage chamber 24 for a long period of time.

  Then, by pulling the closed storage chamber door 50 forward, first, the pressure release valve provided in a part of the closed storage chamber door 50 is operated to release the reduced pressure state of the closed storage chamber 24, and as a result Then, the atmospheric pressure state is reached, and the sealed storage chamber door 50 can be opened. Thus, the sealed storage chamber door 50 can be easily opened and food can be taken in and out.

  Next, the temperature switching control means in the refrigerator of this embodiment will be described with reference to FIG. In addition, this FIG. 4 is a control block diagram which shows schematic structure explaining the control means of the refrigerator of a present Example.

  In the figure, for example, a control device 46 constituted by a microcomputer or the like has a temperature detected by a temperature sensor 42 that detects the temperature of the refrigerator compartment 2 and the temperature between an ice temperature temperature range and a chilled temperature range. The temperature set by the switchable temperature adjusting unit 44 is input, and control signals to the damper device 41 and the heater 43 are output based on those temperatures.

  More specifically, when the temperature detected by the temperature sensor 42 is lower than a reference temperature A, the amount of cold air is controlled (suppressed) by reducing the opening degree of the damper device 41 or completely closing it. . When the temperature becomes too low, the heater 43 is energized to increase the temperature.

  When the detected temperature of the temperature sensor 42 is higher than the reference temperature A, the opening degree of the damper device 41 is increased, and the cool air is supplied to the cool air circulation space in the sealed storage chamber 24 so that the temperature in the sealed storage chamber 24 is increased. Lower.

In addition to the “ice temperature temperature zone setting” and the “chill temperature zone setting”, the temperature adjustment unit 44 can be set to “auto mode” for automatically switching between the ice temperature temperature zone and the chilled temperature zone, The switching of the food storage temperature range is determined based on the electrical output of the CO ₂ sensor 45.

First, when vegetables are stored in the closed storage chamber 24, the CO ₂ concentration in the closed storage chamber 24 increases due to the breathing action of the vegetables, and the negative pressure pump 29 is turned on to turn on the inside of the closed storage chamber 24. air is introduced into the storage case, it is spread around the CO ₂ sensor 45, the electrical output of the CO ₂ sensor 45 is reduced. When meat and fish are preserved, the electrical output does not change because the CO ₂ concentration hardly changes.

Using this characteristic, when the electrical output of the CO ₂ sensor 45 decreases, it is determined that the vegetables are stored, and when the electrical output does not change, the meat and fish are stored. And control to automatically switch to the ice temperature range.

Hereinafter, a control method in which the CO ₂ sensor 45 detects that vegetables have been stored in the sealed storage chamber 24 will be described with reference to FIGS. 5 and 6.

First, CO ₂ sensor 45 as shown in FIG. 5, a module using a semiconductor-type CO ₂ sensor for an electrical output of 0~5V by the concentration of the surrounding CO ₂ (ppm), for example, sealed storage chamber 24 In the case where the CO ₂ concentration is Cx [ppm], the voltage Vx [V] is output from the CO ₂ sensor 45.

The control device 46 is configured to detect the CO ₂ concentration in the sealed storage chamber 24 and control the temperature based on the value of the voltage Vx, but the closed storage chamber 24 originally contains CO ₂ contained in the atmosphere. CO ₂ emitted from food and CO ₂ contained in the exhalation of a person entering when storing food are mixed. For this reason, only measuring the voltage Vx cannot detect only CO ₂ generated from the food, and therefore the stored food cannot be determined.

Means for solving the above problem will be described with reference to an operation chart shown in FIG. First, when the refrigerator compartment door 6 is closed from opening, it is determined that food is stored, and after a predetermined time has elapsed, the vacuum pump is turned on for Ta time, and the minimum value of the voltage detected at this time is Va. Moreover, CO ₂ concentration Ca of the sealed storage chamber 24 to be detected at this time, and CO ₂ contained in the atmosphere, a CO ₂ contained the like in human breath that has flowed during storage, emitted from the food It can be said that CO ₂ itself is not purely detected.

Thereafter, the negative pressure pump 29 is turned on again for Tb time after T1 time, and the minimum value of the voltage detected at this time is set to Vb. Here, when vegetables are stored in the sealed storage chamber 24, the CO ₂ concentration inside increases due to the breathing action of the vegetables during T1. On the other hand, when foods that do not emit CO ₂ such as meat and fish are stored, the CO ₂ concentration hardly changes. That is, in the control device 46, it is possible to determine that meat and fish are stored when Vb = Va and vegetables are stored when Va> Vb.

Further, the CO ₂ concentration emitted from the food is expressed by Va−Vb, and the increase rate of the CO ₂ concentration is higher as the value of Va−Vb is larger. That is, it can be determined that more vegetables are stored.

With the above control, the detection operation is performed twice with an interval of T1 time, so that only CO ₂ emitted from the food can be detected and the food can be determined.

(Example 2)
In the semiconductor CO ₂ sensor used in the refrigerator described in the first embodiment, the sensor sensitivity changes depending on the temperature and humidity around the sensor, and the electrical output also changes.

Therefore, if the temperature or humidity is changed as shown in FIG. 7, despite the CO ₂ concentration is increased, it becomes first-time measurement value Va and second time values measured value Vb is near the, the CO ₂ concentration is increased If not, it may be detected incorrectly.

Therefore, a method for accurately measuring the CO ₂ concentration in the sealed storage chamber 24 even when the ambient temperature or humidity changes will be described.

First, during the Ta time, the maximum value Vamax and the minimum value Vamin of the electrical output of the CO ₂ sensor 45 are measured. It can be said that the change amount ΔVa (Vamax−Vamin) of the electrical output at this time is a detected value of the CO ₂ concentration at the temperature and humidity during the Ta time.

Similarly, during the time Tb, the maximum value Vbmax and the minimum value Vbmin of the electrical output of the CO ₂ sensor 45 are measured. It can be said that the change amount ΔVb (Vbmax−Vbmin) of the electrical output at this time is a detected value of the CO ₂ concentration at the temperature and humidity during the time Tb.

Here, since ΔVa and ΔVb are measured values in the respective measurement environments, changes in electrical output due to the influence of temperature and humidity are excluded, and changes in electrical output due to increase and decrease in CO ₂ concentration are captured.

Therefore, when ΔVa = ΔVb, it can be determined that no meat, fish, or anything is stored in the sealed storage chamber 24. In the case of ΔVb> ΔVa, it can be determined that the CO ₂ concentration in the closed storage chamber 24 has increased during T1 time, that is, it can be determined that vegetables have been stored.

That is, the first change amount (ΔVa) of the maximum value (Vamax) and the minimum value (Vamin) of the detected value of the CO ₂ sensor within the first predetermined time (Ta), and a predetermined time elapses from the first predetermined time. The second change amount is obtained by comparing the maximum value (Vbmax) and the second change amount (ΔVb) of the minimum value (Vbmin) of the detected value of the CO ₂ sensor within the second predetermined time (Tb). If it is larger than the first change amount (ΔVb> ΔVa), it is determined that the CO ₂ concentration in the sealed storage chamber 24 is increasing, and it is determined that the vegetable has been stored. And it can control by switching temperature so that it may be cooled and preserve | saved in the temperature range suitable for vegetables.

With the above control, the CO ₂ detection accuracy can be further improved.

DESCRIPTION OF SYMBOLS 1 Refrigerator body 2 Refrigeration room 3, 4 Freezing room 5 Vegetable room 6 Refrigeration room door 7, 8, 9 Freezing room door 10 Vegetable room door 11 Outer box 12 Inner box 13 Foam insulation 14 Compressor 15 Evaporator 16 Blower 24 Sealed storage chambers 25 to 27 Door pocket 28 Ice-making water pump 29 Negative pressure pump 30 Back panel 31 First cold air discharge port 32 Second cold air discharge port 33 Cold air return port 34 to 36 Partition wall 37 Cold air return passage 40 Sealed storage chamber Main body 41 Damper device 42 Temperature sensor 43 Heater 44 Temperature controller 45 CO ₂ sensor 46 Control device 50 Sealed storage room door 60 Food tray 80 Antioxidant component release cassette 81 Antioxidant

Claims (6)

The refrigerator main body includes a plurality of storage chambers, a storage chamber door that opens and closes the storage chamber, and a gas sensor that detects a gas concentration of at least a part of the plurality of storage chambers, and the gas sensor has an interior to the outside. The gas in the sealed storage chamber that suppresses gas movement is detected, and includes a vacuum pump that discharges the gas in the sealed storage chamber to the outside, and the vacuum pump and the gas sensor are stored in a storage case, The gas is detected by the gas sensor by discharging the gas in the sealed storage chamber into the storage case with the vacuum pump, and the gas sensor detects the gas concentration at least twice at predetermined time intervals. A refrigerator characterized in that the increase or decrease in gas concentration is detected by the difference between the first detection value and the second detection value.   The gas sensor includes a plurality of storage chambers, a storage chamber door that opens and closes the storage chamber, and a gas sensor that detects a gas concentration of at least a part of the plurality of storage chambers in a refrigerator main body, and the gas sensor within a first predetermined time The first change amount (ΔVa) of the maximum value (Vamax) and the minimum value (Vamin) of the detected value of the gas sensor and the gas sensor in a second predetermined time (Tb) after a predetermined time has elapsed from the first predetermined time. When the second change amount (ΔVb) of the maximum value (Vbmax) and the minimum value (Vbmin) of the detected value is compared, the second change amount is larger than the first change amount (ΔVb> ΔVa ), And determining that the gas concentration in the storage chamber is increasing. A door opening / closing switch for detecting opening / closing of the storage chamber door is provided, and the gas sensor performs a first output detection operation after a predetermined time after the door opening / closing switch detects the closing of the storage chamber door. The refrigerator according to claim 1 or 2. A door opening / closing switch for detecting opening / closing of the storage chamber door; after detecting the closing of the storage chamber door with the door opening / closing switch, for a predetermined time before performing the first output detection operation with the gas sensor; and drives the vacuum pump, refrigerator of claim 1, wherein. The refrigerator according to claim 1 or 2 , wherein the gas sensor is a CO2 sensor whose sensor detection value increases or decreases depending on CO2 concentration, and is one of a semiconductor type, a solid electrolyte type, and an infrared type . By estimating the storage of the storage chamber by the detection value of the gas sensor, and said switching Rukoto said storage compartment at a set temperature range suitable for the stored goods, refrigerator according to claim 1 or 2, wherein.