JP6789895B2 - refrigerator - Google Patents

Description

The present invention relates to a refrigerator.

As a conventional refrigerator, there is one shown in Japanese Patent Application Laid-Open No. 2009-36440 (Patent Document 1). This refrigerator is provided with a decompression storage chamber (low pressure chamber), and the decompression storage chamber has a structure inside the refrigerator, and air is sucked by a decompression pump (vacuum pump) to reduce the pressure. A pressure switch (pressure sensor) is used as an air pressure detecting means in the decompression storage chamber, and when the detected pressure is higher than a predetermined pressure, the vacuum pump is operated, and when the detected pressure is lower than the predetermined pressure, the vacuum pump is stopped to operate intermittently. It has become.

In addition, there is one shown in Japanese Patent Application Laid-Open No. 2010-281465 (Patent Document 2). According to Patent Document 2, the decompression target pressure in the decompression storage chamber is set to the vicinity of the decompression maximum pressure of the vacuum pump (= the decompression target pressure) without using a pressure switch as the air pressure detecting means in the decompression storage chamber. The control means controls the operation / stop of the vacuum pump based on a set time determined from the maximum decompression pressure and the decompression target pressure to bring the pressure in the decompression storage chamber to a desired pressure. It is something to hold. The operation timing of the vacuum pump is controlled by opening and closing the refrigerator door.

JP-A-2009-36440 Japanese Unexamined Patent Publication No. 2010-281465

However, the above-mentioned conventional example has the following problems.

In Patent Document 1, since the on / off of the operation of the vacuum pump is controlled by the pressure switch, as shown in FIG. 5 of Patent Document 1, for the pressure switch in the vacuum pump in addition to the decompression storage chamber (low pressure chamber). It is necessary to form a closed chamber. In this way, if a plurality of closed spaces are provided, the possibility of air leakage increases accordingly. In the present specification, the air leak means that air flows into the closed space through the gap between the closed space and the closed space due to the pressure difference between the closed space and the outside of the closed space in the closed space of the vacuum storage chamber or the vacuum pump. Is shown.

On the other hand, in Patent Document 2, since the pressure switch is not used as the air pressure detecting means in the decompression storage chamber, the air leak can be solved. However, the operation timing of the vacuum pump is controlled by opening and closing the door of the refrigerator compartment, and the operation of the vacuum pump is controlled after a certain period of time has elapsed. However, if the operation timing of the vacuum pump is simply changed to open / close the refrigerator door, the problem (1) of frequently operating the vacuum pump even when the decompression storage chamber door is not opened / closed is raised, and the vacuum pump Reliability is a concern.

Further, the decompression target pressure in the decompression storage chamber is set in the vicinity of the decompression target pressure of the vacuum pump (= the decompression target pressure), and the control means is set to a set time determined from the decompression maximum pressure and the decompression target pressure. Based on this, when controlling the operation / stop of the vacuum pump, it is preferable that the operation time is short in consideration of the reliability of the vacuum pump. However, when the decompression target pressure in the decompression storage chamber is set low, it takes a certain period of time for the decompression target pressure in the decompression storage chamber to reach the vicinity of the decompression maximum pressure of the vacuum pump. Therefore, there is a problem (2) that the decompression storage chamber is damaged when the strength of the decompression storage chamber is weak due to the decompression combined with the problem (1). Further, in terms of cost, the vacuum pump that does not use the pressure switch that detects the air pressure in the decompression storage chamber is low in cost, but the strength of the decompression storage chamber is increased in order to solve the problem (2). There is also a problem (3) that it is costly to do so and it is difficult to realize it at low cost.

An object of the present invention is to provide a low-cost and feasible refrigerator provided with a highly reliable low-pressure chamber by a simple configuration without using a pressure switch.

The present invention is a refrigerator provided with a refrigerating chamber, a storage chamber installed in the refrigerating chamber, and a depressurizing means for depressurizing the storage chamber, and a vacuum pump having no pressure detecting means is provided as the depressurizing means. When the door opening time from opening to closing of the refrigerator door is longer than a certain period of time, the vacuum pump is operated for a predetermined time.

According to the present invention, it is possible to realize a refrigerator provided with a highly reliable decompression storage chamber at low cost by a relatively simple configuration without using a pressure switch. Furthermore, it is possible to extend the life of the vacuum pump and eliminate air leaks associated with the installation of pressure detecting means.

It is a front view of the refrigerator of one Embodiment of this invention. It is a front view when all the doors of the refrigerator of FIG. 1 were removed. It is a perspective view of the state where the vacuum pump and the conduit are connected to the decompression storage chamber of FIG. It is a control block diagram in this embodiment. It is a figure which shows the decompression characteristic of the vacuum pump 16 which is a principle of this invention. It is the figure which showed the connection of the vacuum pump provided with the pressure detecting means, the conduit, and the decompression storage chamber simply. It is the figure which showed the connection of the vacuum pump, the conduit, and the decompression storage chamber which is not provided with a pressure detecting means simply. It is a basic control flowchart diagram at the time of decompression operation. It is a flowchart in the function of step S3 of FIG. 8 and step S33 of FIG. It is a flowchart in the function of step S28 of FIG. It is a figure which shows the decompression performance of the vacuum pump 14 and the state of air leakage. It is a time chart diagram which shows the supplement of the example of the operation of FIGS. 8, 9, 10 and 11. It is a time chart diagram which shows the supplement of the example of the operation of FIGS. 8, 9, and 10.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of the refrigerator of the present embodiment. In this example, the refrigerator main body 1 has a structure in which a refrigerating chamber 2, an ice making chamber 3, a first freezing chamber 4, a second freezing chamber 5, and a vegetable compartment 6 are arranged in this order from the top. The refrigerating room 2 and the vegetable room 6 are storage rooms whose internal temperatures are in the refrigerating temperature zone, while the ice making room 3, the first freezing room 4, and the second freezing room 5 have an internal temperature of 0 ° C. or lower. It is a storage room in the freezing temperature range (for example, a temperature range of about -20 ° C to -18 ° C). Reference numeral 11 in the drawing is an operation panel, which is installed on the refrigerator compartment door 2a.

A plurality of the above-mentioned doors are provided on the front surface of the refrigerator main body 1, and among these doors, the refrigerating room doors 2a and 2b are doors that close the front opening of the refrigerating room 2 and are the ice making room doors. Reference numeral 3a is a door for closing the front opening of the ice making chamber 3, and the first freezing chamber door 4a is a door for closing the front opening of the first freezing chamber 4, and the second freezing chamber door 4a. Reference numeral 5a is a door for closing the front opening of the second freezing chamber 5, and the vegetable compartment door 6a is a door for closing the front opening of the vegetable compartment 6. The refrigerating room doors 2a and 2b are composed of so-called double doors that open in a double door, and the refrigerating room 1 will be described in detail later, but in FIG. 2 attached, all the doors are removed. It is a front view of a refrigerator, and is provided with a refrigerating room door switch 7 for detecting the opening and closing of the refrigerating room doors 2a and 2b. On the other hand, the ice making room door 3a, the first freezing room door 4a, the second freezing room door 5a, and the vegetable room door 6a are composed of drawer-type doors, and the structure is such that the container in the storage room is pulled out together with the drawer door. ing. Further, the first freezing room door switch 8 for detecting the opening / closing of the first freezing room door 4a, and FIG. 2 shows the ice making room door for detecting the opening / closing of each of the ice making room door 3a and the second freezing room door 5a. The second freezer door switch 9 (the switch board is equipped with an element for detecting the opening / closing of the ice making room door 3a and an element for detecting the opening / closing of the second freezer door 5a, respectively, but only one board is used. A vegetable compartment door switch 10 for detecting the opening / closing of the vegetable compartment door 6a is provided. Further, as shown in FIG. 2, the refrigerating chamber of the refrigerator 1 is provided with a refrigerating chamber temperature sensor 17 for detecting the temperature in the refrigerating chamber.

Subsequently, a decompression storage chamber 12 is provided at the bottom of the refrigerating chamber 2 of FIG. 1 attached. FIG. 3 is a perspective view of the decompression storage chamber 12, and the decompression storage chamber 12 is connected to the vacuum pump 14 which is a decompression means via a conduit 13, and has a structure for depressurizing the internal space thereof. An opening for putting in and taking out food is formed on the front surface of the decompression storage chamber 12, and a decompression storage chamber door 12a for hermetically opening and closing the opening is provided.

In the above configuration, an embodiment in which the pressure reducing operation is performed in the pressure reducing storage chamber 12 will be described below with reference to FIGS. 4 to 13.

<Control block>
FIG. 4 is a control block diagram. In FIG. 4, reference numeral 15 indicates a microcomputer (hereinafter, referred to as “microcomputer”) provided in a part of the refrigerator. Further, as shown in FIG. 2, a pair of refrigerating room door switches 7 for detecting the opening / closing of the double doors 2a and 2b of the refrigerating room 2 are provided corresponding to both of the double doors 2a and 2b. , The detection signals from these refrigerating room door switches 7 (in FIG. 4, these are collectively shown as one refrigerating room door switch 7) are input to the microcomputer 15. (If there is only one refrigerating room door, a refrigerating room door switch 7 for detecting the opening and closing of one refrigerating room door is provided.) In addition, the ice making room door 3a and the second freezing room door 5a are provided. Ice making room door / second freezer door switch 9 for detecting opening / closing, first freezer door switch 8 for detecting opening / closing of first freezing room door 4a, and vegetable room door 6a for detecting opening / closing The detection signals from the vegetable compartment door switch 10 and the refrigerator compartment temperature sensor 17 are input to the microcomputer 15.

That is, the microcomputer 15 complies with the control specifications described later based on the detection signals from the refrigerating room door switch 7, the first freezing room door switch 8, the ice making room door / second freezing room door switch 9, and the vegetable room door switch 10. , Outputs a control signal to the vacuum pump 14. As shown in the figure, the vacuum pump 14 includes a DC motor as a driving force source thereof, and the microcomputer 15 controls the operation of the vacuum pump 14 by controlling the rotational operation of the DC motor. ..

Next, FIG. 5 shows an example of decompression performance when the vacuum pump 14 is operated. The horizontal axis represents the operating time since the operation of the vacuum pump 7 was started in the atmospheric pressure state, and the vertical axis represents the pressure in the decompression storage chamber 12. In the present specification, the pressure value is a gauge pressure, and the unit thereof is kPa · G. Therefore, atmospheric pressure = 0 kPa · G, and when the pressure is lower than that, it becomes a negative value.

That is, as is clear from the graph of FIG. 5, when the vacuum pump 14 is continuously operated to start the decompression of the decompression storage chamber 12 after closing the decompression storage chamber door 12a, the pressure gradually decreases with the passage of time. However, the fluctuation rate (inclination) of the pressure state at the initial stage of the vacuum start fluctuates due to the fluctuation of the volume of the decompression storage chamber 12 (that is, when food is not stored or stored inside). That is, while the amount of air sucked is different, when the same vacuum pump 14 is used, it is considered that the smaller the volume, the faster the pressure decreases in proportion to the volume of the decompression storage chamber 12.

Here, consider the decompression operation in the decompression storage chamber 12. Although the volume of the decompression storage chamber 12 itself is determined, when the user stores food in the decompression storage chamber 12, the amount of air that can be sucked in the decompression storage chamber 12 decreases, so that the actual volume of the decompression storage chamber 12 is small. It is the same as becoming. When the decompression target pressure of the decompression storage chamber 12 is set to, for example, -20 kPa · G, the operation time of the vacuum pump 14 can be simply set according to the volume of the decompression storage chamber and controlled to achieve simple control. ..

Therefore, the pressure reduction is controlled without using the pressure switch 18. When the pressure switch 18 is used as shown in FIG. 6, it is necessary to form a closed chamber for the pressure switch in the vacuum pump. In this way, if a plurality of closed spaces are provided, the possibility of air leakage increases accordingly. When the pressure switch 18 is not used as shown in FIG. 7, the enclosed space can be reduced and the possibility of air leakage can be reduced.

In the present embodiment, when the time from the opening of the refrigerating chamber doors 2a and 2b to the closing of the door is A or more for a predetermined time, it is considered that the decompression storage chamber 12 has been used, and the vacuum pump 14 is operated. ing. In this way, by switching the vacuum pump on / off (start / stop) based on the opening / closing time of the door, the vacuum pump can be controlled without providing a pressure switch, and leak suppression and cost reduction can be achieved. It will be possible. The opening / closing time of the door is measured by the refrigerator compartment door switch 7.

It is desirable that the above-mentioned predetermined time A is specifically set to 3 seconds. Next, the rationale for the door opening time of 3 seconds, which is a condition for operating the vacuum pump, will be described.

To open and close the decompression storage chamber 12 to put in and take out food in the refrigerator 1, open the refrigerator doors 2a and 2b, open the door 12a of the decompression storage chamber 12, pull out the tray of the decompression storage chamber 12, and put in and take out food. Then, a series of procedures of returning the tray, closing the door 12a of the decompression storage chamber, and closing the doors 2a and 2b of the refrigerator compartment are required, which is longer than the case where the decompression storage chamber 12 is not used.

Therefore, it was confirmed by an experiment by 21 people how long it would take concretely, using a refrigerator with a French door for the refrigerator compartment like Refrigerator 1. Then, the average time is about 7 seconds, and as a result of considering the variation, if the vacuum pump is operated when both the refrigerating chamber doors 2a and 2b are opened for 3 seconds, other than the decompression storage chamber 12 It was found that when using the refrigerator compartment, it is possible to prevent the vacuum pump from operating unnecessarily. In the case of the left and right double doors as in the present embodiment, the door opening / closing time A refers to the time from the first opening of either the left or right door to the closing of one of the left or right doors.

FIGS. 8, 9 and 10 are basic control flowcharts when the decompression operation is performed. In this flowchart, when the time from opening to closing of the refrigerating chamber doors 2a and 2b is longer than a predetermined time, it is considered that the decompression storage chamber 12 has been used, and the vacuum pump is operated. At the start of control (step S1), it is assumed that the pressure in the decompression storage chamber 12 is around 0 kPa · G, and the power is turned on.

Immediately after the power is turned on, the vacuum pump 12 is not operating, so the operation is stopped in step S2.
Next, the open / closed state of the refrigerator compartment doors 2a and 2b is determined in step S3. Step S3 has the condition of step S5 (see FIG. 9), and the operation is changed depending on whether the refrigerator compartment door is a double door (French door) or a single door (single door) with double doors. Refrigerator 1 shows a double-door refrigerator with two refrigerator doors. (Refrigerator 1 is a refrigerator equipped with double doors 2a and 2b for refrigerating chambers, but the flowchart below also supports control of a single-door refrigerator.)
The flow chart of the refrigerator with the French door will be described below.

In steps S6 to S9 (see FIG. 9), when the refrigerating chamber doors 2a and 2b are both opened, the time (count i) for opening the refrigerating chamber doors 2a and 2b is measured. After that, the count i time is determined in step S15, and if it is less than A seconds, the count i is reset in step S16, and the vacuum pump does not operate. When the count i time in step S15 is A seconds or more, it is assumed that the door 12a of the decompression storage chamber 12 has been opened and closed, and the process proceeds to step S17 to reset the count i time. The reason for counting the time for opening both the refrigerator doors 2a and 2b is that in order to open and close the vacuum storage chamber 12 in the refrigerator 1 to put in and take out food, the refrigerator doors 2a and 2b are opened and the vacuum storage chamber 12 is opened. It is necessary to open the door 12a, pull out the tray of the decompression storage chamber, put in and take out food, return the tray, close the door 12a of the decompression storage chamber, and close the refrigerator compartment doors 2a and 2b. This is because it is considered to be longer than the case where the reduced pressure storage chamber 12 is not used. Since the decompression storage chamber 12 of the present embodiment is installed in an area straddling both the refrigerating chamber doors 2a and 2b, the refrigerating chamber doors 2a and 2b are required to open and close the decompression storage chamber door 12a. Both need to be opened. If it is a small decompression storage chamber and it fits within the area on the back side of one of the refrigerating chamber doors, only the one refrigerating chamber door needs to be considered.

In steps S18 to S23, the measurement of the count ii (vacuum pump 14 operation waiting time count) is started after the refrigerating chamber doors 2a and 2b are both closed. The reason why the count ii (vacuum pump 14 operation waiting time count) is provided is that the number of operations of the vacuum pump 14 increases when the refrigerator doors 2a and 2b are frequently opened and closed in a short time such as during cooking. This is to prevent it. If the refrigerating room doors 2a and 2b are opened in the middle of the count ii, the count ii is reset and the count ii is restarted.

In step S24, it is confirmed that the refrigerator 1 refrigerating room doors 2a and 2b, the ice making room door 3a, the second freezing room door 5a, the first freezing room door 4a, and the vegetable room door 6a are all closed. The operation of the pump 14 is started, and the count iii (vacuum pump 14 operation time count) is measured from step S26.

Steps S26 to 44 are controls when the vacuum pump 14 is operating. In step 27, when the refrigerating chamber temperature becomes 45 ° C. or higher (when the refrigerating chamber temperature sensor 17 detects a temperature of 45 ° C. or higher), the vacuum pump 14 is prevented from operating beyond the operating temperature range. Therefore, stop the operation of the vacuum pump.

In steps S28 to S34, the opening and closing of the refrigerator doors 2a and 2b, the ice making room door 3a, the second freezing room door 5a, the first freezing room door 4a, and the vegetable room door 6a are monitored during the count iii. When any of the doors is opened, the operation of the vacuum pump 14 is stopped and the count iii is stopped. In step S33 (see FIG. 10), the refrigerator compartment doors 2a and 2b are monitored (similar to steps S4 to S14 in FIG. 9).

In the case of a French door, the time (count i) for opening both the refrigerator doors 2a and 2b is measured in steps S6 to S9. After that, the count i time is determined in step S35, and if the count i time is A seconds or more, it is considered that the door 12a of the decompression storage chamber 12 has been opened and closed, and the counts iii and i are reset in steps S36 and 37. , Step S18 shifts to the start of count ii (vacuum pump 14 operation waiting time count).

If the count i is less than A seconds in step S35, the count i is reset in step S38 to determine whether the count iii has stopped in step S39 (refrigerator 1 refrigerating room doors 2a, 2b, ice making room door 3a, If any of the second freezer door 5a, the first freezer door 4a, and the vegetable door 6a is opened, the vacuum pump 14 is stopped in step S31), and if it is stopped, step S40, In S41, the operation of the vacuum pump 14 and the count iii are restarted. That is, even when both the refrigerating chamber doors 2a and 2b are opened, if both the refrigerating chamber doors 2a and 2b are opened for less than A seconds, the vacuum pump 14 is opened when either of the refrigerating chamber doors 2a and 2b is opened. After the refrigerating chamber doors 2a and 2b are closed, the operation of the vacuum pump 14 and the counting iii are restarted.

After the vacuum pump 14 has been operated for C seconds, the count iii is terminated and reset in steps S43 and 44, the count i is reset in step 16, and the operation of the vacuum pump is stopped in step S2.

As described above, after the pressure in the decompression storage chamber 12 reaches the decompression target pressure, the pressure in the decompression storage chamber 12 is basically low unless the user opens the decompression storage chamber door 12a. The condition is maintained. However, it is difficult to make the space including the vacuum pump 14, the conduit 13, and the decompression storage chamber 12 completely sealed, and a minute air leak occurs. Therefore, as shown in FIG. 5 above, if air leaks from the outside to the inside of the decompression storage chamber 12, the internal pressure gradually rises and eventually returns to 0 kPa · G (atmospheric pressure). Go (see dashed line in FIG. 11).

In FIG. 11, the operation of the vacuum pump 14 is started in the above-mentioned flowchart (vacuum pump state “ON: operation”), and then the operation is continued for C seconds (C time). That is, in FIG. 11, the vertical axis shows the pressure state in the decompression storage chamber 12, and further below the pressure state shows the ON / OFF state of the vacuum pump 14.

According to this, as described above, the pressure of the decompression storage chamber 12 is gradually depressurized to a substantially predetermined pressure (= decompression target pressure) regardless of the fluctuation of the volume. After that, after stopping the operation for a predetermined time (D time), the pressure in the decompression storage chamber 12 has returned to the pressure requiring decompression (target upper limit pressure) (air is leaking). That) is expected, and then the operation of the vacuum pump 14 is started again. The operating time (E time) of the vacuum pump 14 required to reduce the pressure from the target upper limit pressure to the decompression target pressure can also be set in advance in the same manner as described above. Then, by repeating this, it is possible to maintain the pressure in the decompression storage chamber 12 at a desired low pressure without detecting the pressure in the decompression storage chamber 12. That is, by setting the operation time of the vacuum pump 14 based on the internal volume of the decompression storage chamber 12 and the decompression target pressure of the decompression storage chamber 12, the operation time of the vacuum pump is controlled by a relatively simple control. A refrigerator equipped with a highly reliable low-pressure chamber without using a pressure switch can be realized at low cost.

FIG. 12 is a time chart supplementing the description of the double-opening determination of the refrigerating room doors 2a and 2b in the flowcharts of FIGS. 8, 9 and 10 and the D time and E time of FIG. The vacuum pump 14 has a refrigerating room door (indicated as a refrigerating room door in FIG. 12, French doors have both refrigerating room doors 2a and 2b, and a single door has one refrigerating room door) opening time T0 <A (count i). If it is the judgment time), do not drive. The opening time of the refrigerating room door (indicated as the refrigerating room door in FIG. 12, the French door is both the refrigerating room doors 2a and 2b, and the single door is one refrigerating room door) is T0 ≧ A (judgment time of count i). If so, it is considered that the decompression storage chamber door 12a of the decompression storage chamber 12 has been opened and closed, and the vacuum pump 14 operates after the operation waiting time B seconds of the vacuum pump 14. As shown in FIG. 12, if the refrigerating chamber doors 2a and 2b are both opened at times T0 ≧ A (determination time of count i), the decompression storage chamber door 12a of the decompression storage chamber 12 may be opened or closed. The vacuum pump 14 operates. Further, when the vacuum pump 14 continues for D hours after the operation and the time for opening both the refrigerating chamber doors 2a and 2b does not reach T0 ≧ A (determination time of count i), air leakage occurs as described above. In consideration, the E-time vacuum pump 14 is operated.

In this control, if the time T0 ≧ A (determination time of count i) of both opening of the refrigerating chamber doors 2a and 2b is not continuously achieved during the above-mentioned D time, the pressure is already reduced to some extent. Therefore, the time required to reach the decompression target pressure is short. Therefore, the operating time of the vacuum pump 16 is set to C time> E time, and the life of the vacuum pump 14 is extended by not operating the vacuum pump 14 more than necessary.

FIG. 13 shows the opening determination of the refrigerating room doors 2a and 2b when the vacuum pump 14 is operated in the flowcharts of FIGS. 8, 9 and 10 (although it is described as the refrigerating room door in FIG. On the other hand, the single door is a time chart that supplements the case where there is one refrigerating room door). If the time T0 ≧ A (determination time of count i) of both opening of the refrigerating chamber doors 2a and 2b, it is considered that the decompression storage chamber door 12a of the decompression storage chamber 12 has been opened and closed, and the vacuum pump 14 can be operated. As mentioned above. While the vacuum pump 14 is in operation, the refrigerator 1 cold room door (one of the cold room doors 2a and 2b for a French door, one cold room door for a single door), the ice making room door 3a, and the second freezer door 5a. , When any of the doors of the first freezer door 4a and the vegetable door 6a is opened, the operation of the vacuum pump 14 is stopped.

If both opening times T2 <A (judgment time of count i) of the refrigerating room doors (both refrigerating room doors 2a and 2b for French doors and one refrigerating room door for single doors), all doors of refrigerator 1 are closed. Later, the operation of the vacuum pump 14 is restarted. The operating time of the vacuum pump 14 is C = C1 + C2 (total operation for C hours).

If both opening times T2 ≥ A (judgment time of count i) of the refrigerating room door (both refrigerating room doors 2a and 2b for French doors and one refrigerating room door for single door), the decompression of the decompression storage chamber 12 Assuming that the storage chamber door 12a is opened and closed, the vacuum pump 14 operates for C hours after the operation waiting time B seconds of the vacuum pump 14 regardless of the operation time C3 before the vacuum pump 14 is stopped.

According to the refrigerator 1 provided with the decompression storage chamber 12 in which the pressure inside the main body is reduced by the above method, highly reliable decompression is performed by relatively simple control without using a pressure switch. The refrigerator 1 provided with the storage chamber 12 can be realized at low cost, and further, it is possible to extend the life of the vacuum pump 14 and eliminate air leaks associated with the installation of the pressure detecting means. It exerts an excellent effect.

1 Refrigerator body 2 Refrigerator room 2a Refrigerator room door 2b Refrigerator room door 3 Ice making room 3a Ice making room door 4 First freezer room 4a First freezer room door 5 Second freezer room 5a Second freezer room door 6 Vegetable room 6a Vegetable room door 7 Refrigerator door switch 8 1st freezer door switch 9 Ice making room door / 2nd freezer door switch 10 Vegetable room door switch 11 Operation panel 12 Decompression storage room 12a Decompression storage room door 13 Conduit 14 Vacuum pump 15 Microcomputer (microcomputer) )
16 DC motor 17 Refrigerator room temperature sensor 18 Pressure switch (pressure sensor)

Claims (4)

A refrigerator provided with a refrigerating chamber, a storage chamber installed in the refrigerating chamber, and a decompression means for depressurizing the storage chamber.
As the depressurizing means, a vacuum pump having no pressure detecting means is provided, and when the door opening time from opening to closing of the refrigerating chamber door is longer than a certain period of time, the vacuum pump is operated for a predetermined time.
If the door of the refrigerator compartment is opened during the operation of the vacuum pump,
When the door opening time is longer than the certain time,
Compared to when the door opening time is less than the fixed time
A refrigerator characterized in that the driving time of the vacuum pump is long after the refrigerator door is closed. A refrigerator provided with a refrigerating chamber, a storage chamber installed in the refrigerating chamber, and a decompression means for depressurizing the storage chamber.
As the depressurizing means, a vacuum pump having no pressure detecting means is provided, and when the door opening time from opening to closing of the refrigerator door is longer than a certain period of time, the vacuum pump is operated for a predetermined time for a certain period of time. A refrigerator characterized in that the vacuum pump is not operated when the amount is less than . A refrigerator provided with a refrigerating chamber, a storage chamber installed in the refrigerating chamber, and a decompression means for depressurizing the storage chamber.
As the depressurizing means, a vacuum pump having no pressure detecting means is provided, and when the door opening time from opening to closing of the refrigerating chamber door is longer than a certain period of time, the vacuum pump is operated for a predetermined time.
If the refrigerator door is opened during the operation of the vacuum pump,
When the door opening time is equal to or longer than the certain time, the vacuum pump is driven for the predetermined time after closing the refrigerator door.
When the door opening time is less than the fixed time, the time for driving the vacuum pump until the refrigerating chamber door is opened, the time for driving the vacuum pump again after closing the refrigerating chamber door, and the time for driving the vacuum pump again. A refrigerator characterized in that the vacuum pump is turned off when the total of the above reaches the predetermined time. In any of claims 1 to 3 ,
The doors of the refrigerator compartment have left and right double doors, and in order to open and close the storage chamber to put in and take out food, it is necessary to open the left and right double doors . A refrigerator characterized by the time when both the left and right doors are open.

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