JP6495034B2 - refrigerator - Google Patents

Description

  Embodiment of this invention is related with the refrigerator which has a vegetable compartment.

  Vegetables, unlike meat, fish, and processed foods, breathe and release water, carbon dioxide, and ethylene. Vegetables before harvesting grow by absorbing nutrients from the outside and converting them to energy, but vegetables after harvesting lose energy from the outside and consume their own energy. move on. As vegetables degrade, their respiration rate decreases, and water, carbon dioxide, and ethylene emissions also decrease.

  In order to last the vegetables after harvesting, it is necessary to suppress this respiration as much as possible. For this reason, the vegetables are stored at a low temperature, or stored at a low temperature, a high carbon dioxide gas, and a low oxygen state. It is also known that the respiration rate of vegetables is increased by stimuli such as cutting or transporting vegetables. This is because cutting a vegetable produces a skin-free part, which increases the breathing in the cross section and the deterioration proceeds from the cross section first.

  By the way, in order to confirm the respiration rate of vegetables, it can be grasped by measuring the amount of water, carbon dioxide, and ethylene released by this respiration. However, since water is partly released by respiration and simply evaporated due to the low relative humidity of the surroundings, measuring the amount of water does not directly relate to respiration. In addition, there are many vegetables that do not release ethylene, and the quantity is small, so measurement is difficult. Therefore, in order to measure the respiration rate of vegetables, it is common to measure the concentration of carbon dioxide.

  Conventionally, when vegetables are stored in a refrigerator, the vegetables are stored in a vegetable room and stored at a low temperature to prevent deterioration and maintain the freshness of the vegetables.

JP 2004-218924 A Japanese Patent Laid-Open No. 9-287869

  However, the current situation is that the freshness of vegetables stored in the vegetable compartment of the refrigerator relies on user observation and smell. Moreover, since there is no display of the expiration date, consumption of vegetables is completely left to the user. Therefore, there is a problem that it is difficult to store the vegetables in a fresh state in the vegetable room.

  Then, embodiment of this invention aims at providing the refrigerator which can maintain the freshness of vegetables.

Embodiments of the present invention include a vegetable room, a gas sensor that measures the carbon dioxide concentration in the vegetable room, and a control that raises the internal temperature of the vegetable room to a predetermined temperature when the measured concentration measured by the gas sensor is equal to or higher than a reference concentration And a notifying means for notifying a user when the measured concentration falls by a certain percentage from the peak .

In addition, the embodiment of the present invention includes a vegetable compartment, a gas sensor that measures the carbon dioxide concentration in the vegetable compartment, and a release rate of the carbon dioxide that is determined from the measured concentration measured by the gas sensor is equal to or higher than a reference velocity. It is a refrigerator having control means for lowering the temperature in the vegetable room by a predetermined temperature , and notification means for notifying the user when the measured concentration falls by a certain percentage from the peak .

The front view of the refrigerator which shows embodiment of this invention. The longitudinal cross-sectional view of a refrigerator. Explanatory drawing of a refrigerating cycle. The refrigerator block diagram. The front view which shows the display state of a display panel.

  Hereinafter, the refrigerator 10 of one Embodiment is demonstrated based on FIGS.

(1) Structure of refrigerator 10 The structure of the refrigerator 10 is demonstrated based on FIG. 1 and FIG. FIG. 1 is a front view of the refrigerator 10, and FIG. 2 is a longitudinal sectional view as seen from the side of the refrigerator 10.

  The cabinet 12 of the refrigerator 10 is a heat insulation box, and is formed of an inner box and an outer box, and a heat insulating material is filled between the inner box and the outer box. The inside of the cabinet 12 has a refrigerator compartment 14, a vegetable compartment 16, a small freezer compartment 18 and a freezer compartment 20 in order from the top, and an ice making room 21 is provided beside the small freezer compartment 18. A horizontal heat insulating partition 36 is provided between the vegetable compartment 16, the small freezer compartment 18 and the ice making compartment 22. The refrigerator compartment 14 and the vegetable compartment 16 are partitioned by a horizontal partition 38. The front door of the refrigerator compartment 14 is provided with double doors 14a and 14b. The vegetable compartment 16, the small freezer compartment 18, the freezer compartment 20 and the ice making compartment 21 have drawer doors 16a, 18a, 20a and 21a, respectively. Is provided.

  An operation panel 58 for operating the refrigerator 10 is provided in the upper left part of the front surface of the door 14a of the refrigerator compartment 14, and the operation panel 58 is provided with a touch switch and a display unit. Further, a display panel 59 made of a liquid crystal display device is provided at the lower front portion of the door 14a of the refrigerator compartment 14. In addition, a plurality of shelves 40 are provided in the refrigerator compartment 14, and a chilled chamber 44 having a drawer-type chilled container 42 is provided in the lower part. The chilled chamber 44 is a low temperature chamber and stores meat and fish. A plurality of door pockets 46 are provided on the back surface of the door 14 a of the refrigerator compartment 14. The vegetable compartment 16 is provided with drawer-type vegetable containers 48 and 50.

  A refrigeration evaporator (hereinafter referred to as “R EVA”) 28 is provided from the lower back of the refrigerator compartment 14 to the back of the vegetable compartment 16, and a refrigeration blower (hereinafter referred to as “R fan”) 30 is provided below the evaporator. Is provided. The R EVA 28 and the R fan 30 are arranged in an R EVA chamber 17 surrounded by an EVA cover 15. On the back surface of the refrigerator compartment 14, a plurality of cold air outlets from the R evaporator chamber 17 are opened. In the lower part of the R-evaporation chamber 17, a cold air inlet 52 is opened. A gas sensor 56 for measuring the carbon dioxide concentration in the vegetable compartment 16 is provided in the vicinity of the upper portion of the cold air inlet 54 at the lower portion of the R-evaporation chamber 17. A defrost heater (not shown) is provided below the R-eva 28, and a receiving tray 52 for collecting defrost water generated by the R-eva 28 is provided.

  A freezing evaporator (hereinafter referred to as “F EVA”) 32 is provided in the F-evaporating chamber 29 from the back of the small freezer 18 and the ice making chamber 21 to the back of the freezing chamber 20, and a freezing blower is provided above it. (Hereinafter referred to as “F fan”) 34 is provided. A defrost heater (not shown) is provided below the F EVA 32.

  The cold air cooled by the R evaporator 28 is sent to the refrigerator compartment 14 and the vegetable compartment 16 by the R fan 30. The cold air cooled by the F-evapor 32 is sent to the small freezer compartment 18, the ice making chamber 21 and the freezer compartment 20 by the F fan 34.

  A machine room 22 is provided at the bottom of the back surface of the cabinet 12, and the compressor 24 and the like constituting the refrigeration cycle 62 are placed thereon. A control plate 26 is provided at the upper back of the machine room 22.

  A refrigeration room sensor (hereinafter referred to as “R sensor”) 31 that measures the temperature inside the refrigerator compartment 14 is provided on the back surface of the refrigerator compartment 14. A refrigeration sensor (hereinafter referred to as “F sensor”) 35 for measuring temperature is provided.

(2) Configuration of Refrigeration Cycle 62 The refrigeration cycle 62 of the refrigerator 10 will be described with reference to FIG. As shown in FIG. 3, the refrigeration cycle 62 includes a compressor 24, a condenser (condenser) 64 that receives refrigerant gas discharged from the compressor 24 and liquefies heat, and a dryer provided on the outlet side of the condenser 64. 66, a three-way valve 68 provided on the outlet side of the dryer 66 for switching the refrigerant flow path, the R eva 28, the F eva 30, the refrigeration capillary tube (a refrigeration decompression device) as a throttling means for the R eva 28 and the F eva 30 , Hereinafter referred to as “R capillary tube”) 70, a freezing capillary tube (freezing decompression device, hereinafter referred to as “F capillary tube”) 72, and a check valve 74.

  The compressor 24 has a variable frequency by inverter control of the motor, and can thereby change the number of revolutions to control the amount of compressed high-temperature and high-pressure refrigerant gas supplied from the compressor 24.

  The three-way valve 68 is provided on the outlet side of the condenser 64 and also functions as an expansion valve that can control the flow rate while switching the refrigerant flow path to the F and R EVAs 36 and 32. The compressor 24, the condenser 64, and the three-way valve 68 are connected in series, and the R capillary tube 70 and the R EVA 28 are connected in series to the refrigeration side outlet (hereinafter referred to as “R outlet”) of the three-way valve 68. An F capillary tube 72, an F EVA 32, and a check valve 74 are connected in series to the freezing side outlet (hereinafter referred to as “F outlet”) of the three-way valve 68. The pipe connected to the outlet side of the check valve 74 and the pipe connected to the outlet side of the R EVA 28 merge and are connected to the compressor 24 via a suction pipe (suction pipe) 76. Therefore, the high temperature side R EVA 28 connected from the R outlet of the three-way valve 68 via the R capillary tube 70 and the low temperature side F EVA 32 connected from the F outlet of the three way valve 68 via the F capillary tube 72. Are connected in parallel.

  The R EVA 28 is provided with an R EVA sensor 78 for measuring its temperature, and the F EVA 32 is provided with an F EVA sensor 80 for measuring its temperature.

(3) Electrical configuration of refrigerator 10 Next, the electrical configuration of the refrigerator 10 will be described based on the block diagram of FIG. The control plate 26 is provided with a control unit 60 composed of a microcomputer for controlling the refrigerator 10.

  As shown in FIG. 4, the control unit 60 includes a microcomputer, and includes a motor of the compressor 24, an R fan 30, an F fan 34, a gas sensor 56, a three-way valve 68, an R sensor 31, an F sensor 35, and an R EVA sensor 78. F sensor 80 is connected. Further, an operation panel 58 and a display panel 59 provided on the door 14a of the refrigerator compartment 14 are connected.

(4) Cooling mode In the refrigerator 10 having the above-described configuration, the control unit 60 switches and controls the three-way valve 68 based on the measured temperatures of the R sensor 31, the F sensor 35, the R EVA sensor 78, and the F EVA sensor 80. A refrigerated cooling mode (hereinafter referred to as “R mode”) for cooling the refrigerator compartment 14 and the vegetable compartment 16 by flowing a refrigerant through the evaporator 28, and a freezer compartment 18, 20, and an ice making chamber 21 by flowing a refrigerant through the F evaporator 32. A refrigeration cooling mode (hereinafter referred to as “F mode”) is performed.

  The controller 60 starts the R mode when the R internal temperature detected by the R sensor 31 reaches the refrigeration start temperature TR1, and the R internal temperature is the refrigeration end temperature TR2 (however, 0 ° C. <TR2 <TR1). When R is reached, the R mode is terminated. In the R mode, the cold air blown from the R evaporator 28 in the R evaporator chamber 17 to the refrigerator compartment 14 by the R fan 30 circulates from the top to the bottom of the refrigerator compartment 14 and then enters the vegetable compartment 16 to produce vegetables. The vegetables stored in the containers 48 and 50 are cooled and circulated from the suction port 54 at the lower end of the R evaporation chamber 17 to the R evaporation 28.

  The controller 60 starts the F mode when the F internal temperature detected by the F sensor 35 reaches the freezing start temperature TF1, and the F internal temperature is the freezing end temperature TF2 (however, 0 ° C.> TF1> TF2). When F is reached, the F mode is terminated. In the F mode, the cold air blown from the F EVA 32 in the F EVA chamber 29 to the freezer compartment 20, the small freezer compartment 18, and the ice making chamber 21 by the F fan 34 circulates from top to bottom and then into the F evaporator chamber 29. It circulates to F EVA 32.

  When the R internal temperature reaches the refrigeration start temperature TR1 and the F internal temperature reaches the refrigeration start temperature TF1, the F mode is prioritized and the R mode is executed when the refrigeration end temperature TF2 is reached. Alternatively, both the outlets of the three-way valve 68 are opened and the R mode and the F mode are executed simultaneously.

  In addition, the control unit 60 periodically executes a defrosting mode in which the R and F EVAs 28 and 32 are defrosted. In this case, the control unit 60 drives and heats the defrost heater below each of the R and 28 F and 28, and the detected detection temperatures of the R and F sensors 78 and 80 are set to predetermined temperatures (for example, When the temperature is 2 ° C. or higher, the defrost mode is terminated.

(5) Control Method by Gas Sensor 56 Next, five control methods using the gas sensor 56 provided in the vegetable compartment 16 will be described. The gas sensor 56 measures the carbon dioxide gas concentration (%) in the vegetable compartment 16 and outputs it to the control unit 60. The control unit 60 releases the carbon dioxide gas release rate (mg / min) from the temporal change in the measured concentration (%). Is also calculated. In order to measure the carbon dioxide concentration more accurately, measurement is performed when the R fan 30 rotates, cold air circulates in the vegetable compartment 16, and cold air is drawn from the suction port 54 of the R evaporator chamber 17. It is good.

(5-1) First Control Method The first control method will be described. When the measured concentration of the gas sensor 56 is higher than the reference concentration (for example, 0.2%), the control unit 60 increases the internal temperature of the vegetable compartment 16 by a predetermined temperature (for example, 1 ° C. to 2 ° C.). For example, the control unit 60 sets the refrigeration start temperature to (TR1 + 2) and also sets the refrigeration end temperature to (TR2 + 2) as a control method for increasing the internal temperature of the vegetable compartment 16 by a predetermined temperature. Thereby, the internal temperature of the vegetable compartment 16 rises.

  The reason why the temperature in the vegetable compartment is raised is that the high carbon dioxide gas concentration in the vegetable compartment 16 means that the oxygen concentration is reduced and the same effect as the reduced oxygen storage is obtained. Freshness is high and the respiration rate is higher than usual. Therefore, rather than maintaining the inside temperature of the vegetable compartment 16 as it is, even if the inside temperature is raised a little, the amount of respiration of vegetables can be reduced and the freshness can be maintained, and the energy can be saved.

(5-2) Second Control Method The second control method will be described. When the release rate of the carbon dioxide gas is faster than the reference rate (for example, 1.0 mg / min), the controller 60 lowers the internal temperature of the vegetable compartment 16 by a predetermined temperature (for example, 1 ° C. to 2 ° C.). As a control method for lowering the internal temperature of the vegetable compartment 16 by a predetermined temperature, for example, the control unit 60 sets the refrigeration start temperature to (TR1-2) and also sets the refrigeration end temperature to (TR2-2). Thereby, the internal temperature of the vegetable compartment 16 falls.

  The reason for lowering the temperature in the vegetable compartment is that the release rate of carbon dioxide gas is fast, which means that fresh vegetables are stored in the vegetable compartment 16 or that the amount of vegetables stored has increased. In order to keep the freshness of those vegetables, the temperature in the vegetable compartment 16 is lowered.

(5-3) Third Control Method A third control method will be described. The control unit 60 notifies the user that the freshness of the vegetables has dropped when the measured concentration of carbon dioxide gas is below a certain percentage (for example, 50%) compared to the peak. For example, the control unit 60 outputs a sound such as “the carbon dioxide concentration in the vegetable room has decreased” from a speaker provided on the operation panel 58.

(5-4) Fourth Control Method The fourth control method will be described. The control unit 60 displays on the display panel 59 the release rate of the carbon dioxide gas after a certain time (for example, 5 minutes) from when the vegetable compartment 16 is closed.

  The reason for this is that even if the pull-out door 16a of the vegetable compartment 16 is opened and the measured concentration of carbon dioxide is lowered, the concentration of carbon dioxide is stable after a certain period of time, and more accurately in a reset state. This is because the state of breathing can be displayed.

(5-5) Fifth Control Method A fifth control method will be described. The control unit 60 notifies when a certain decrease is observed from the measured concentration when the vegetable compartment 16 is closed. For example, the control unit 60 outputs a sound such as “the carbon dioxide concentration in the vegetable room has decreased” from a speaker provided on the operation panel 58.

  The reason is that if the measured concentration decreases by a certain level, the vegetable respiration may be reduced and deteriorated, which is informed.

(6) Specific Example Next, a specific situation in which each control method described above is implemented will be described with reference to FIG. The control unit 60 graphically displays the measured concentration (%) of the carbon dioxide gas measured by the gas sensor 56 using the display panel 59 with the horizontal axis representing time and the vertical axis representing the release rate (mg / minute). Regarding the release rate (mg / min), the horizontal axis represents time, and the vertical axis represents the release rate (mg / min). Further, the control unit 60 displays on the display panel 59 the current time (17:55 in FIG. 5), the current measured concentration (0.098% in FIG. 5), and the current release rate (in FIG. 5). In this case, 1.0 mg / min) is displayed as a digital number.

  Also, the user opens the drawer door 16a of the vegetable compartment 16 at 14:40 to store additional vegetables in the vegetable container 48, and again opens the drawer door 16a of the vegetable compartment 16 to make dinner at 17: 5. It is assumed that the vegetables are opened and the vegetables are taken out.

  As shown in the measured concentration graph, until the user stores vegetables at 14:40, the freshness of the vegetables stored last time has decreased, and the measured concentration of carbon dioxide gas has decreased. When the user stores the vegetables, the release of carbon dioxide from the new vegetables increases and the measured concentration starts to increase, reaching a peak around 16:00. After that, as the freshness of the vegetables decreases, the emission of carbon dioxide decreases and the measured concentration also decreases.

  As shown in the measured concentration graph, when the user took out the vegetables at 17: 5 in preparation for dinner, the pull-out door 16a of the vegetable room 16 was opened, so that the carbon dioxide gas went out and the measured concentration suddenly increased. Descend. Thereafter, when the pull-out door 16a is closed, the measured concentration starts to rise again.

  As shown in the release rate graph, until the user opens the pull-out door 16a at 14:40, the freshness of the vegetables in the vegetable compartment 16 has decreased, so the release rate of carbon dioxide from the vegetables has decreased. ing.

  As shown in the release rate graph, when the user stores vegetables at 14:40, the release rate increases rapidly due to new vegetables, and carbon dioxide gas is released at a constant release rate until the measured concentration reaches a peak. And after reaching a peak around 16:00, the release rate from vegetables decreases.

  As shown in the release rate graph, when the user reopens the pull-out door 16a at 17:05 and puts the vegetables out of the vegetable compartment 16 in preparation for dinner, the amount of vegetables is reduced and the release rate is further reduced. To do.

  The above control method will be specifically described based on FIG. 5 based on the change in the measured concentration and the release rate with time as described above.

  Regarding the first control method, when the user stores vegetables in the vegetable room 16 at 14:40, the measured concentration increases and exceeds the reference concentration (for example, 0.2%), the control unit 60 Regardless of the type of the cooling mode, the internal temperature of the vegetable compartment 16 is increased by a predetermined temperature (for example, 1 ° C. to 2 ° C.).

  Regarding the second control method, since the release rate exceeds a reference rate (for example, 1.0 mg / min) at 14:40, the control unit 60 does not depend on the type of the current cooling mode. The inside temperature of 16 is lowered by a predetermined temperature (for example, 1 ° C. to 2 ° C.). As in this specific example, when the conditions of the first control method and the conditions of the second control method are satisfied at the same time, the inside temperature of the vegetable compartment 16 is not changed.

  Regarding the third control method, when the measured density reaches a peak at 0.3% around 16:00, and then the measured density decreases to 0.15% or less, the control unit 60 prompts the user to operate the operation panel 28. Notification from the speaker. However, in the case of this specific example, when the pull-out door 16a is opened, the measured concentration is lowered and notified. In this case, since the user knows that the measured density is lowered by opening the pull-out door 16a, the notification can be ignored.

  Regarding the fourth control method, after the user closes the pull-out door 16a of the vegetable compartment 16 at 14:40, the control unit 60 displays the release rate after a predetermined time (for example, 5 minutes) on the display panel 59. . This allows the user to determine how much the vegetables are breathing.

  Regarding the fifth control method, after the user closes the pull-out door 16a of the vegetable compartment 16 at 14:40, the control unit 60 notifies the speaker of the operation panel 28 when the measured concentration decreases by a predetermined concentration. Do. The same situation occurs when the user opens the pull-out door 16a at 17:05, but the user knows that the reason is that he opened the pull-out door 16a and took out the vegetables. The user can ignore the notification.

(7) Effect According to the present embodiment, by digitally displaying the measured concentration and release rate of the carbon dioxide gas on the display panel 59, it can be seen that the user is breathing vegetables, An outline of whether or not breathing is normal can be obtained by comparing with the amount. For example, when the user buys a similar type of vegetable, the same numerical value is always displayed, and it can be determined that normal storage has been performed.

  Moreover, since the gas sensor 56 is provided inside the vegetable compartment 16, it can accurately measure the amount of carbon dioxide generated by the breathing of the vegetables stored in the vegetable compartment 16. In particular, since carbon dioxide is heavier than air, the concentration can be accurately measured because it is provided below the vegetable compartment 16, particularly in the vicinity of the circulating cold air inlet 54.

  In addition, by displaying a graph representing the change over time in the measured concentration and release rate of carbon dioxide gas, the user can determine changes over time due to the taking in and out of food and whether breathing is stable.

  Moreover, in the 1st control method, when the measurement density | concentration of a carbon dioxide gas is high, since the internal temperature of the vegetable compartment 16 is raised, the vegetable compartment 16 is not cooled very much but energy saving can be aimed at.

  Moreover, in the 2nd control method, since the vegetable increased when the discharge | release speed | rate of carbon dioxide gas is large, the freshness of a vegetable can be hold | maintained by lowering | hanging the internal temperature of the vegetable compartment 16. FIG.

  Further, in the third control method, notification is made when the measured concentration of carbon dioxide gas is below a certain ratio compared to the peak time, so the user does not make a judgment by looking at the measured concentration graph on the display panel 59. Can judge the deterioration of vegetables.

  In the fourth control method, the user can more accurately determine the vegetable respiration rate by displaying the carbon dioxide gas release rate after a certain time from when the vegetable compartment 16 is closed.

  Further, in the fifth control method, since the notification is made when there is a decrease in the predetermined concentration from the measured concentration when the vegetable compartment 16 is closed, the user determines that the vegetable respiration has deteriorated and has deteriorated. it can.

(8) Modified Example In the above embodiment, the gas sensor 56 is provided in the vicinity of the suction port 54 in the lower part of the vegetable compartment 16, but instead, it may be provided in the upper part of the vegetable compartment 16. This is because there is a possibility that agitation when cold air enters the vegetable compartment 16, convection due to a difference in the internal temperature, a diffusion phenomenon due to a difference in gas concentration, or the like occurs.

  Moreover, in the said embodiment, although the display panel 59 was provided as a means to display the measurement density | concentration etc. of a carbon dioxide gas, you may provide a display means in the vegetable compartment 16 instead.

  Further, in the above embodiment, all of the first control method to the fifth control method are performed. However, the present invention is not limited to this. When only the first control method is performed, when only the second control method is performed, When the first and second control methods are performed, the third to sixth control methods may be performed in association with the first control method or the second control method.

  Moreover, in the said embodiment, although the refrigeration start temperature and the refrigeration end temperature were adjusted in the 1st control method, and the internal temperature of the vegetable compartment 16 was raised, it replaced with this and the defrost heater of R Eva 28 was operated. You may let them.

  Although one embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 ... Refrigerator, 16 ... Vegetable room, 56 ... Gas sensor, 58 ... Operation panel, 59 ... Display panel, 60 ... Control part

Claims (10)

Vegetable room,
A gas sensor for measuring the carbon dioxide concentration in the vegetable compartment;
Control means for raising the internal temperature of the vegetable compartment by a predetermined temperature when the measured concentration measured by the gas sensor is equal to or higher than a reference concentration;
Informing means for informing the user that the measured concentration is lower than the peak by a certain percentage;
Refrigerator. Vegetable room,
A gas sensor for measuring the carbon dioxide concentration in the vegetable compartment;
Control means for lowering the internal temperature of the vegetable compartment by a predetermined temperature when the release rate of the carbon dioxide gas determined from the measured concentration measured by the gas sensor is equal to or higher than a reference rate;
Informing means for informing the user that the measured concentration is lower than the peak by a certain percentage;
Refrigerator. The control means lowers the internal temperature of the vegetable compartment by a predetermined temperature when the release rate of the carbon dioxide gas determined from the measured concentration is equal to or higher than a reference rate.
The refrigerator according to claim 1. Having a display means for displaying the change over time of the measured concentration,
The refrigerator according to any one of claims 1 to 3. Display means for displaying the change in the release rate with time,
The refrigerator according to claim 3 . Having a display means for displaying the release rate after a predetermined time after closing the vegetable compartment door;
The refrigerator according to claim 3 . The notification means notifies the user when the measured concentration has decreased by a predetermined concentration after closing the vegetable compartment door,
The refrigerator according to any one of claims 1 to 3. The gas sensor is provided in the lower part of the vegetable compartment,
The refrigerator according to any one of claims 1 to 3. The gas sensor is provided in a cold air inlet on the back of the vegetable compartment,
The refrigerator according to any one of claims 1 to 3. The gas sensor measures the measured concentration during operation of a refrigeration fan that blows cold air from a refrigeration evaporator to the vegetable compartment.
The refrigerator according to any one of claims 1 to 3.

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