TW201910703A - Refrigerator having a low-pressure chamber with high reliability and a simple configuration without using a pressure switch - Google Patents

Abstract

An object of the present invention is to provide a low-cost realizable refrigerator having a low-pressure chamber with high reliability and a simple configuration without using a pressure switch (pressure sensor). The refrigerator is provided with a refrigeration chamber (2), a decompression storage chamber (12) installed in the refrigeration chamber (2), and a decompression means for decompressing the decompression storage chamber (12), wherein the decompression means is provided with a vacuum pump (14) having no pressure detection means, and the vacuum pump (14) is operated for a predetermined time when there is a door open time from the opening to the closing of the doors (2a, 2b) of the refrigeration chamber for a predetermined time or more.

Description

refrigerator

The present invention relates to a refrigerator.

For example, Japanese Laid-Open Patent Publication No. 2009-36440 (Patent Document 1) is incorporated. This refrigerator is provided with a decompression storage chamber (low pressure chamber) which is a structure inside the refrigerator and is decompressed by suction of air by a decompression pump (vacuum pump). A pressure switch (pressure sensor) is used as the air pressure detecting means in the decompression storage chamber. When the sensing pressure is higher than the specific pressure, the vacuum pump is operated. When the pressure is low, the vacuum pump is stopped, and the intermittent operation is controlled. In addition, there is a case shown in Japanese Laid-Open Patent Publication No. 2010-281465 (Patent Document 2). According to the patent document 2, the air pressure detecting means in the decompression storage chamber does not use a pressure switch, and the decompression target pressure in the decompression storage chamber is set in the vicinity of the maximum pressure of the vacuum pump (= the decompression target (pressure), the control means controls the operation/stop of the vacuum pump based on the set time determined by the maximum pressure of the decompression and the pressure of the decompression target, and maintains the pressure in the decompression storage chamber at a desired pressure. Further, the timing of operation of the vacuum pump is controlled by opening and closing of the refrigerating compartment door. [PRIOR ART DOCUMENT] [Patent Document 1] JP-A-2009-36440 (Patent Document 2) JP-A-2010-281465

[Problems to be Solved by the Invention] However, the aforementioned prior art example has the following problems. In Patent Document 1, since the opening/closing of the operation of the vacuum pump is controlled by the pressure switch, as shown in FIG. 5 of Patent Document 1, in addition to the decompression storage chamber (low pressure chamber), the pressure switch is also formed in the vacuum pump. The necessity of a closed room. In this way, if a plurality of confined spaces are provided, the possibility of air leakage in this portion also increases. In addition, the term "air leakage" as used in the present specification means that the air is leaked from the gap of the sealed space by the pressure difference between the sealed space and the sealed space in the sealed space of the decompression storage chamber or the vacuum pump. . On the other hand, in Patent Document 2, since the air pressure detecting means in the decompression storage chamber does not use the pressure switch, the leakage of the air can be solved. However, since the timing of the operation of the vacuum pump is controlled by opening and closing of the refrigerating compartment door, the control of the vacuum pump is performed after a certain period of time. However, when the opening of the refrigerating compartment door is used as the timing of the operation of the vacuum pump, the vacuum pump can be frequently operated even when the door of the decompression storage compartment is not opened or closed (1), which becomes a vacuum pump. Doubt about trustworthiness. Further, the decompression target pressure in the decompression storage chamber is set in the vicinity of the maximum pressure reduction pressure of the vacuum pump (= the decompression target pressure), and the control means is determined based on the decompression maximum pressure and the decompression target pressure. In the case where the operation and the stop of the vacuum pump are controlled in the set time, it is preferable that the operation time is shorter in consideration of the reliability of the vacuum pump. However, when the decompression target pressure in the decompression storage chamber is set to be low, it takes a certain period of time until the decompression target pressure in the decompression storage chamber reaches the vicinity of the decompression maximum pressure of the vacuum pump. In other words, in addition to the problem point (1), there is a problem that the decompression storage chamber is damaged due to the pressure reduction when the strength of the decompression storage chamber is weak (2). Further, on the cost side, the vacuum pump that does not use the pressure switch that performs the air pressure detection in the decompression storage chamber is low-cost, but in order to solve the problem (2), it is necessary to increase the strength of the decompression storage chamber. A problem point (3) that is difficult to realize at low cost can also be mentioned. An object of the present invention is to provide a refrigerator which can be realized at low cost without having a low pressure chamber having a high reliability by a simple configuration without using a pressure switch. [Means for Solving the Problem] The present invention relates to a refrigerator including a refrigerator compartment, a storage compartment installed in the refrigerator compartment, and a decompression means for decompressing the storage compartment, and a vacuum pump having no pressure detecting means as the decompression means When the door opening time until the door of the refrigerator compartment is opened until the door is closed for a certain period of time or longer, the vacuum pump is operated for a specific period of time. [Effects of the Invention] According to the present invention, it is possible to realize a refrigerator having a highly reliable decompression storage chamber at a low cost without using a pressure switch and having a relatively simple configuration. Further, it is possible to achieve a long life of the vacuum pump or to cancel the air leakage accompanying the installation of the pressure detecting means.

The embodiment of the present invention will be described based on the following drawings. Fig. 1 is a front elevational view of the refrigerator of the first embodiment. In this example, the refrigerator main body 1 is configured such that the refrigerating compartment 2, the ice making compartment 3, the first freezing compartment 4, the second freezing compartment 5, and the vegetable compartment 6 are arranged in this order. Further, the refrigerating compartment 2 and the vegetable compartment 6 are storage compartments in which the internal temperature is in the refrigerating temperature zone, and on the other hand, the ice making compartment 3, the first freezing compartment 4, and the second freezing compartment 5 have an internal temperature of 0 ° C. The following storage compartments of the freezing temperature zone (for example, a temperature zone of about -20 ° C to -18 ° C). Further, reference numeral 11 in the drawing is an operation panel which is provided in the refrigerating compartment door 2a. The front door of the refrigerator body 1 is provided with a plurality of the aforementioned doors. Among the doors, the refrigerating chambers 2a and 2b are doors for closing the front opening portion of the refrigerating chamber 2, and the ice making chamber door 3a is for closing the ice making chamber. The door for the front opening portion of the third opening, the first freezing chamber door 4a is a door for closing the front opening portion of the first freezing compartment 4, and the second freezing compartment door 5a is for occluding the second freezing compartment 5. The door of the front opening, and then the vegetable compartment door 6a is a door for closing the front opening of the vegetable compartment 6. Further, the refrigerating compartment doors 2a and 2b are constituted by so-called left and right split type double-opening doors, which will be described in detail later, and FIG. 2 is a front view of the refrigerator in which all the doors are removed. A refrigerating compartment door switch 7 for detecting opening and closing of the refrigerating compartment doors 2a and 2b is provided. On the other hand, the ice making compartment door 3a, the first freezing compartment door 4a, the second freezing compartment door 5a, and the vegetable compartment door 6a are constituted by a pull-out type door, and together with the pull-out door, the container in the storage compartment is pulled. Out of the structure. Further, the first freezing compartment door switch 8 for detecting the opening and closing of the first freezing compartment door 4a is provided, and the opening and closing of the ice making compartment door 3a and the second freezing compartment door 5a are respectively detected for use in FIG. The ice-making compartment door/second freezing compartment door switch 9 is equipped with an element for detecting opening and closing of the ice-making compartment door 3a and an element for detecting opening and closing of the second freezing compartment door 5a on the switch substrate, but the substrate is 1 The vegetable compartment door switch 10 for detecting the opening and closing of the vegetable compartment door 6a is shown. Moreover, as shown in FIG. 2, the refrigerator compartment temperature sensor 17 which detects the temperature in a refrigerator interior is provided in the refrigerator interior of the refrigerator 1. Next, the decompression storage chamber 12 is provided in the lowermost stage in the refrigerator compartment 2 of 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 by means of a decompression means, that is, the conduit 13, thereby decompressing the internal space. Further, in the front surface of the decompression storage chamber 12, an opening for food feeding is formed, and a decompression storage chamber door 12a for sealingly opening and closing the opening is provided. With the above configuration, an embodiment in which the pressure reduction operation in the reduced pressure storage chamber 12 is performed will be described with reference to Figs. 4 to 13 below. <Control Block> Fig. 4 is a control block diagram. In Fig. 4, reference numeral 15 shows a micro computer provided in a part of the refrigerator. Further, as also shown in the foregoing FIG. 2, both of the aforementioned double-opening doors 2a, 2b corresponding to the aforementioned refrigerating compartment 2 are provided with a pair of refrigerating compartment door switches 7 for sensing the opening and closing thereof, from these refrigerating compartment door switches 7 ( The detection signals indicating these collections as one refrigerating compartment door switch 7) in Fig. 4 are input to the aforementioned microcomputer 15. (When the refrigerating compartment door is a single piece, the refrigerating compartment door switch 7 for detecting the opening and closing of the single refrigerating compartment door is provided). Further, the opening and closing of the ice making compartment door 3a and the second freezing compartment door 5a are separately detected. The ice making compartment door/second freezing compartment door switch 9, the first freezing compartment door switch 8 for detecting the opening and closing of the first freezing compartment door 4a, the vegetable compartment door switch 10 for detecting the opening and closing of the vegetable compartment door 6a, and the refrigerating compartment The detection signal of the temperature sensor 17 is input to the microcomputer 15. That is, the microcomputer 15 is in accordance with the control specifications described later based on the detection signals from the refrigerating compartment door switch 7, the first freezing compartment door switch 8, the ice making compartment door/second freezing compartment door switch 9, and the vegetable compartment door switch 10. And outputting a control signal to the vacuum pump 14 described above. Further, as shown in the drawing, 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 rotation operation of the DC motor. Next, an example of the pressure reduction performance when the vacuum pump 14 is operated is shown in FIG. The horizontal axis represents the operation time from the start of operation of the vacuum pump 7 in the atmospheric pressure state, and the vertical axis shows the pressure in the decompression storage chamber 12. Further, in the present specification, the pressure value is gauge pressure, and the unit is expressed by kPa·G. That is, atmospheric pressure = 0 kPa and G, which is a negative value when it is lower than the pressure. That is, as shown in the drawing of Fig. 5, when the vacuum storage chamber door 12a is closed and the vacuum pump 14 is continuously operated to start the decompression of the decompression storage chamber 12, the pressure is gradually lowered with time, but the decompression storage chamber is lowered. When the volume of 12 is changed (that is, when the food is not contained therein or stored), the rate of change (slope) of the pressure state at the beginning of the vacuum is changed. In short, in the case where the same amount of air is used and the same vacuum pump 14 is used, the smaller the volume, the faster the pressure drop should be faster than the volume of the decompression storage chamber 12. Here, the decompression operation of the decompression storage chamber 12 is considered. When the volume of the decompression storage chamber 12 itself is stored in the decompression storage chamber 12 by the user who makes the determination, the amount of air that can be sucked in the decompression storage chamber 12 is reduced, so that the decompression storage chamber 12 is reduced. The substantial volume of the volume is the same. When the decompression target pressure of the decompression storage chamber 12 is, for example, -20 kPa·G, the operation time of the vacuum pump 14 is simply set in accordance with the volume of the decompression storage chamber, and control can be simply controlled. The pressure switch 18 is not used here for pressure reduction control. When the pressure switch 18 is used as shown in Fig. 6, it is necessary to form a sealed chamber for the pressure switch in the vacuum pump. In this way, if a plurality of confined spaces are provided, the possibility of air leakage in this portion also increases. When the pressure switch 18 is not used as shown in Fig. 7, the sealed space is reduced, and the possibility of air leakage can be reduced. In the present embodiment, when the time from the door opening to the closing of the refrigerator compartment doors 2a, 2b is equal to or longer than the specific time A, it is considered that the vacuum pump 14 is operated by the decompression storage chamber 12. In this way, when the opening/closing (operation/stop) of the vacuum pump is switched according to the opening and closing time of the door, the vacuum pump can be controlled without the pressure switch, making it possible to reduce the leakage and reduce the cost. Further, the opening and closing time of the door is measured by the refrigerator compartment door switch 7. The specific time A described above is specifically set to be 3 seconds. Next, the basis for the operation of the vacuum pump, that is, the door opening time of 3 seconds will be described. In the refrigerator 1, when the decompression storage compartment 12 is opened and closed and the food is taken out, it is necessary to open the refrigerating compartment doors 2a, 2b, open the door 12a of the decompression storage compartment 12, pull out the tray of the decompression storage compartment 12, and take it out. When the food is returned to the tray, the door 12a of the decompression storage compartment is closed, and a series of programs such as the refrigerating compartment doors 2a, 2b are closed, and the time is longer than when the decompression storage compartment 12 is not used. Here, it takes a long time to specifically use a refrigerator in which the refrigerator compartment door is a double-door, such as the refrigerator 1, and is confirmed by an experiment of 21 people. As a result of the calculation, the average time is about 7 seconds. When the vacuum pump is operated when the double-opening time of the refrigerating compartment doors 2a and 2b is 3 seconds in consideration of the result of the discrete difference, the refrigerating compartment other than the decompression storage compartment 12 can be used. To prevent wasteful startup of the vacuum pump. Further, in the case where the right and left split mode is employed as in the present embodiment, the opening and closing time A of the door refers to the time from the first opening of the left and right doors until the left and right doors are closed. 8, 9, and 10 are basic control flowcharts when the decompression operation is performed. In the present flowchart, when the time from the opening of the refrigerating compartment doors 2a, 2b to the closing of the door is a predetermined time or longer, it is considered that the vacuum pump is operated by the decompression storage chamber 12. In addition, when the control is started (step S1), it is assumed that the power is turned on in the vicinity of the pressure in the decompression storage chamber 12 at around 0 kPa and G. After the power is turned on, the vacuum pump 12 is not operated, so the operation is stopped in step S2. Next, in step S3, the open/close state of the refrigerating compartment doors 2a, 2b is determined. In step S3, there are conditions of step S5 (refer to FIG. 9), and different operations may be different depending on whether the refrigerating compartment door is two doors (double door) or a single door (single door) that are left and right. Further, the refrigerator 1 is a refrigerator in which the refrigerator compartment door has two left and right sides. (The refrigerator 1 is a refrigerator in which the doors of the left and right sides of the refrigerating compartment doors 2a and 2b are mounted, and the following flowchart also corresponds to the control of the refrigerator of the single door.) The flow chart of the refrigerator with double doors is described below. In steps S6 to S9 (see Fig. 9), when the refrigerating compartment doors 2a, 2b are double-opened, the time (count i) at which the refrigerating compartment doors 2a, 2b are double-opened is measured. Thereafter, the count i time is determined in step S15, and when it is less than A seconds, the number i is redesigned in step S16, and the vacuum pump does not operate. When the count i time in step S15 is equal to or longer than A seconds, it is considered that the door 12a of the decompression storage chamber 12 is opened and closed, and the process proceeds to step S17 to redesign the number of times i. Further, the reason for counting the time when the refrigerating compartment doors 2a, 2b are double-opened is that when the refrigerator 1 is opened and closed, the decompression storage compartment 12 is opened and closed, and when the food is taken out, it is necessary to open the refrigerating compartment doors 2a, 2b and open the decompression storage. The door 12a of the chamber 12 pulls out the tray of the decompression storage chamber, takes out the food, returns the tray to close the door 12a of the decompression storage chamber, closes the series of procedures such as the refrigerating chamber doors 2a, 2b, and does not use the decompression In the case of the storage compartment 12, the time is longer than that of the storage compartment 12. Further, since the decompression storage chamber 12 of the present embodiment is provided in a region spanning both the refrigerating chamber doors 2a and 2b, the door 12a of the decompression storage chamber is opened and closed, and either of the refrigerating chamber doors 2a and 2b is provided. Open necessary. When it is assumed that it is a small-sized decompression storage room and is accommodated in the back side area of one of the refrigerating compartment doors, it is sufficient to consider the refrigerating compartment door. In steps S18 to S23, the refrigerating compartment doors 2a, 2b are double-closed, and the measurement of the count ii (the waiting time count of the operation of the vacuum pump 14) is started. The reason for the "counting ii" (the waiting time count of the operation of the vacuum pump 14) is to prevent the number of operations of the vacuum pump 14 from increasing when the refrigerating compartment doors 2a, 2b are frequently opened and closed in a short period of time during cooking. On the way of counting ii, when the refrigerating compartment doors 2a, 2b are opened, the number ii is redesigned and the counting ii is restarted. It is confirmed in step S24 that the refrigerating compartment doors 2a, 2b, the ice making compartment door 3a, the second freezing compartment door 5a, the first freezing compartment door 4a, and the vegetable compartment door 6a of the refrigerator 1 are all closed, and the vacuum pump 14 is started in step S25. Operation, starting from step S26, the measurement of the number iii (vacuum pump 14 operation time count) is performed. Steps S26-44 are control when the vacuum pump 14 is operated. In step S27, when the temperature in the refrigerator compartment is 45 ° C or higher (when the refrigerator compartment temperature sensor 17 senses a temperature of 45 ° C or higher), the operation of the vacuum pump is stopped in order to prevent the temperature range of the vacuum pump 14 from being exceeded. In steps S28 to S34, the opening and closing of the doors of the refrigerating compartment doors 2a, 2b, the ice making compartment door 3a, the second freezing compartment door 5a, the first freezing compartment door 4a, and the vegetable compartment door 6a of the refrigerator 1 are monitored in the count iii. When any of the doors is open, the operation of the vacuum pump 14 is stopped, and the counting iii is stopped. In step S33 (see Fig. 10), the refrigerating compartment doors 2a, 2b are monitored (the same as steps S4 to S14 of Fig. 9). When the door is double-opened, the time (count i) at which the refrigerating compartment doors 2a, 2b are double-opened is measured in steps S6 to S9. Thereafter, when it is determined in step S35 that the count i time is equal to or greater than A seconds, it is considered that the door 12a of the decompression storage chamber 12 is opened and closed, and in steps S36, 37, the numbers iii and i are redesigned, and the steps are shifted to The count iii of S18 (the vacuum pump 14 operation waiting time count) starts. When the count i is less than A seconds in step S35, the number i is redesigned in step S38, and it is judged in step S39 whether or not the count iii is stopped (opening the refrigerating compartment doors 2a, 2b of the refrigerator 1, the ice making compartment door 3a, the second freezing compartment) When any of the door 5a, the first freezing compartment door 4a, and the vegetable compartment door 6a is closed, the vacuum pump 14 is stopped in step S31, and when it is stopped, the operation of the vacuum pump 14 is performed in steps S40 and S41. Count iii starts again. That is, when the refrigerating compartment doors 2a, 2b are double-opened, as long as the double opening time of the refrigerating compartment doors 2a, 2b is less than A seconds, the vacuum pump 14 is stopped and counted at the time when one of the refrigerating compartment doors 2a, 2b is opened. Iii, when the refrigerating compartment doors 2a, 2b become double closed, the operation of the vacuum pump 14 and the counting iii are resumed. After the vacuum pump 14 is operated for C seconds, the end and reset of the count iii are performed in steps S43 and 44, the number i is redesigned in step S16, 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 maintained substantially at a low pressure state as long as the user does not open the decompression storage chamber door 12a. However, it is difficult to achieve a structure in which the space including the vacuum pump 14, the duct 13, and the decompression storage chamber 12 is completely sealed, and minute air leakage (leakage) occurs. Here, as described above with reference to Fig. 5, as long as the air leaks from the outside of the decompression storage chamber 12 to the inside, the internal pressure thereof gradually rises, and finally returns to 0 kPa·G (atmospheric pressure) (see the broken line in Fig. 11). Fig. 11 shows the operation of the vacuum pump 14 (the vacuum pump state "ON: operation") in the above-described flowchart, and continues to operate only for C seconds (C time). That is, in Fig. 11, the vertical axis indicates the pressure state in the decompression storage chamber 12, and further, the ON/OFF state of the vacuum pump 14 is displayed below it. As a result, as described above, the pressure of the decompression storage chamber 12 is gradually reduced to a specific pressure (= decompression target pressure) substantially even if the volume thereof changes. Thereafter, after stopping the operation for only a specific time (D time), it is presumed that the pressure in the decompression storage chamber 12 is returned to the pressure (target upper limit pressure) necessary for the decompression (air leakage), and here again. The operation of the vacuum pump 14 is started. Further, the operation time (E time) of the vacuum pump 14 necessary for decompressing the target upper limit pressure to the decompression target pressure can be set in advance as described above. Then, by performing this operation in reverse, the pressure in the decompression storage chamber 12 can be maintained 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, by controlling the simple operation mode of only the operation time of the vacuum pump, It is possible to realize a highly reliable refrigerator having a low pressure chamber without using a pressure switch and at a low cost. Fig. 12 is a timing chart for explaining the double opening determination of the refrigerating compartment doors 2a, 2b and the time D and E time of Fig. 11 for the flowcharts of Figs. 8, 9, and 10. The opening time of the refrigerating compartment door (shown as the refrigerating compartment door in Fig. 12, but the double-door is the refrigerating compartment door 2a, 2b, and the single-piece door is the refrigerating compartment door) is T0 < A (determination time of the count i) The vacuum pump 14 does not operate. The opening time of the refrigerating compartment door (shown as the refrigerating compartment door in Fig. 12, but the double-door is the refrigerating compartment door 2a, 2b, and the single-piece door is the refrigerating compartment door) is T0≧A (determination time of the count i) If it is considered that the decompression storage compartment door 12a of the decompression storage compartment 12 is opened and closed, the vacuum pump 14 starts to operate after the operation wait time B of the vacuum pump 14. Further, as shown in Fig. 12, when the time of the double opening of the refrigerating compartment doors 2a, 2b is T0 ≧ A (the determination time of the count i), regardless of whether or not the vacuum storage chamber door 12a of the decompression storage chamber 12 is opened or closed, the vacuum pump 14 is opened or closed. Operation. Further, after the operation of the vacuum pump 14 is continued in the D time, and the time of the double opening of the refrigerating chamber doors 2a, 2b does not reach T0 ≧ A (the determination time of the count i), the vacuum pump is considered in consideration of the leakage of the air as described above. 14 operation E time. Further, in the present control, when the operation of the D time is continued and the time of the double opening of the refrigerating compartment doors 2a, 2b does not reach T0 ≧ A (the determination time of the count i), since the pressure has been decompressed to some extent, A short arrival time to reach the decompression target pressure is sufficient. Here, the operation time of the vacuum pump 16 is C time>E time, and the vacuum pump 14 is not required to perform unnecessary operations to achieve a long life. Figure 13 is a view showing the opening of the refrigerating compartment doors 2a, 2b when the vacuum pump 14 of the flowcharts of Figures 8, 9, and 10 is operated (shown in Figure 13 as a refrigerating compartment door, but the double-opening is a single of the refrigerating compartment doors 2a, 2b) The timing chart of the explanation of the case where the single-piece door is a piece of the refrigerator compartment door). When the time of the double opening of the refrigerating compartment doors 2a, 2b is T0 ≧ A (the determination time of the count i), the decompression storage compartment door 12a of the decompression storage compartment 12 is regarded as being opened and closed, and the vacuum pump 14 is operated as described above. In the operation of the vacuum pump 14, the refrigerating compartment door of the refrigerator 1 (the single door of the refrigerating compartment doors 2a, 2b when the double door is opened, the single door is the refrigerating compartment door), the ice making compartment door 3a, the second freezing When any of the door 5a, the first freezing compartment door 4a, and the vegetable compartment door 6a is opened, the operation of the vacuum pump 14 is stopped. When the double-opening time of the refrigerating compartment door (for both the refrigerating compartment doors 2a and 2b and the single-piece door being the refrigerating compartment door) is T2<A (determination time of the counting i), all the doors of the refrigerator 1 are closed again. The operation of the vacuum pump 14 is started. Further, the operation time of the vacuum pump 14 is C=C1+C2 (total operation C time). When the refrigerating compartment door (two doors of the refrigerating compartment doors 2a and 2b and the single-piece door is one of the refrigerating compartment doors) is T2≧A (determination time of the count i), it is regarded as the decompression storage compartment 12 The decompression storage chamber door 12a is opened and closed, regardless of the operation time C3 before the vacuum pump 14 is stopped, and the vacuum pump 14 operates for C time after the operation wait time B seconds of the vacuum pump 14. According to the above method, the refrigerator 1 having the decompression storage chamber 12 whose internal pressure is reduced in pressure inside the main body can be used, and the pressure switch can be used at a low cost without a pressure switch. In the refrigerator 1 of the decompression storage room 12 having high reliability, the life of the vacuum pump 14 can be extended, or an excellent effect such as air leakage accompanying the installation of the pressure detecting means can be eliminated. Next, another embodiment (second embodiment) in which the pressure pump is not used and the excess vacuum pump is turned on and the decompression operation in the decompression storage chamber 12 is performed is described. Figure 14 is a control block diagram. Reference numeral 17 is a temperature sensor for detecting the temperature in the refrigerator compartment 2, reference numeral 15 is a microcomputer mounted on a refrigerator control board (not shown), and reference numeral 20a is a display LED incorporated in the operation panel 20, and reference numeral 14b is a symbol 14b. A DC motor that drives the vacuum pump 14. The detection signals of the refrigerating compartment door switch 7, the decompression storage compartment door switch 21, and the refrigerating compartment temperature sensor 17 are input to the microcomputer 15, and the output signals are output to the display LED 20a and the vacuum pump 14 (DC motor 14b) according to the control specifications described later. Composition. In addition, the current signal 14c represents the signal of the motor current of the DC motor 14b, and the signal is fed back to the microcomputer 15. Further, the current signal 14c fed back to the microcomputer 15 is amplified by the current discharge circuit 22 mounted on the control panel of the refrigerator, so that a minute current increase and decrease can be detected with higher precision. Next, Fig. 15 shows the state of the pressure inside the decompression storage chamber 12 when the vacuum pump 14 is continuously operated, and the state of the current signal 14c. The horizontal axis represents the operation time from the start of operation of the vacuum pump 14, and the vertical axis shows the pressure in the decompression storage chamber 12 and the level of the current signal 14c. Further, in the present specification, the pressure value is gauge pressure, and the unit is expressed by kPa·G. That is, atmospheric pressure = 0 kPa and G, which is a negative value when it is lower than the pressure. When the vacuum pump 14 is connected to the decompression storage chamber 12 and operated, according to experiments by the inventors, when the vacuum pump 14 is started to operate as shown in Fig. 15, the pressure gradually decreases as time passes. Here, the pump having the pressure reduction capability of the vacuum pump 14 of the present embodiment is not -30 kPa·G or less. By using such a pump, when the volume of the decompression storage chamber 12 is different, that is, when the amount of air to be pumped is different, and the vacuum pump 14 uses the same pump, the smaller the volume, the faster the pressure drop should be, but the speed should be faster, but In the present embodiment, the pressure inside the decompression storage chamber 12 should not be lower than -30 kPa·G. On the other hand, the current signal 14c increases the current value as the pressure in the low pressure chamber decreases. This phenomenon is caused by the characteristics of the direct current motor 14b used as the power source of the vacuum pump 14. The DC motor has a characteristic that the motor load is proportional to the motor current, so as the air pressure in the low pressure chamber decreases, the motor load increases, and the current value also increases. When the pressure is below a certain pressure, the amount of work of the pump mechanism is reduced (it becomes impossible to reduce the pressure), so that the motor load is reduced and the motor current is lowered. In the refrigerator described above, the vacuum pump having the switch having no detection pressure is used to detect the pressure in the decompression storage chamber 12 to be a specific pressure or lower, using the timing chart shown in FIG. 16 and the flowchart shown in FIG. specification. First, the decompression storage chamber 12 is housed inside the refrigerating compartment 2, and whether or not the vacuum pump 7 is opened is determined by whether or not the refrigerating compartment door 2a is opened or closed. In the present embodiment, the vacuum pump is turned on only when the time until the refrigerator door 2a is opened (S001) until the closing (S002) is 3 seconds or longer. (S003). When the opening and closing time is less than 3 s, the vacuum pump is kept off (OFF) (S004), and when it is 3 s or more, the vacuum pump 7 is turned on (S005). Here, the basis for the operation of the vacuum pump, that is, the door opening time of 3 seconds will be described. When the decompression storage compartment door 12a of the decompression storage compartment 12 is opened and closed, and the food is taken out, it is necessary to open the refrigerating compartment door 2a (the left and right sides of the double-opening door in the left-right split mode), and the decompression storage compartment door is opened. 12a, the tray is pulled out, the food is put out, the tray is returned, the decompression storage compartment door 12a is closed, and a series of procedures such as closing the refrigerating compartment door 2a are performed, and the time is longer than when the decompression storage compartment 12 is not used. Here, how long it takes to use the refrigerator door as a double-door refrigerator is confirmed by an experiment of 21 people. As a result of the calculation, the average time is about 7 seconds. When the vacuum pump is operated when the double-opening time of the refrigerating compartment door is 3 seconds in consideration of the result of the discrete difference, it is possible to prevent waste when the refrigerating compartment other than the decompression storage compartment 12 is used. Start the vacuum pump. When the vacuum pump is turned on, the refrigerator door is opened or closed (S006), and when there is opening and closing, the low pressure detection control is ended, and after the refrigerator door is closed, the vacuum pump is turned on until the third specific time (t3), and the operation is terminated (S007). Here, the third specific time (t3) is set so that the pressure inside the decompression storage chamber 12 is between -15 and -20 kPa and G, and is set to a value of 150 s or the like in the present embodiment. The third specific time (t3) changes depending on the volume of the decompression storage chamber 12. For example, 20L is set to 150s, and 10L is set to 75s, and the set time is changed with the volume. When the first specific time (t1) has elapsed without opening and closing of the refrigerating compartment door, the current first current value (I1) is measured (S008). As shown in the timing chart of Fig. 16, after the DC motor 14b is turned on, a current (burst current) which is much larger than the normal current flows, and the first specific time elapses after the vacuum pump 14 is turned on in order to prevent erroneous detection. The first current value (I1) is measured after (t1). The surge current is approximately several ms to several hundreds of ms, and in the present embodiment, the first specific time is set to 10 s. After that, when the refrigerator compartment door 2a is not opened or closed until the second specific time (t2), the second current value (I2) is measured (S011). When the refrigerator compartment door is opened and closed before the second specific time (t2), the low pressure detection control is ended, and after the refrigerator door is closed, the vacuum pump is turned on until the third specific time (t3), and the operation is completed. (S010) Here, the second specific time (t2) is set to be shorter than the third specific time (t3), whereby the decompression storage chamber 12 is already in a low pressure and there is no need for further decompression. The operation of the excess vacuum pump 14 can be suppressed. As described above, the DC motor 14b increases or decreases the current value in accordance with the motor load. Therefore, in order to sufficiently ensure the pressure variation range, the second specific time is preferably as long as possible. However, in order to suppress the activation of the excess vacuum pump 14, it is necessary to use as short a time as possible. In the present embodiment, the second specific time (t2) is set to 30 to 70% of the third specific time (t3). For example, when the third specific time (t3) is set to a low-pressure chamber capacity of 150 s, the third specific time is set to 75 s. The difference between the first current value (I1) and the second current value (I2) is calculated (S012), and the result (⊿I) and 0 kPa·G (atmospheric pressure) and the threshold (X) for determining the low pressure are compared (S013). When ⊿I<X, the pressure in the decompression storage chamber 12 is judged to be a low pressure, and the vacuum pump 14 is turned off. (S014). In the case of ⊿I≧X, the pressure in the decompression storage chamber 12 is determined to be 0 kPa·G (atmospheric pressure), and the vacuum pump 14 is continuously turned on until the third specific time (t3). (S015) With the above control specifications, the pressure in the decompression storage chamber 12 is estimated from the current of the DC motor 14b, and the operation of the wasted vacuum pump 14 can be suppressed. Thereby, by determining the pressure in the decompression storage chamber 12 without using the pressure switch, it is possible to provide a refrigerator having high reliability and reliability. Here, the term "leakage" as used herein refers to a sealed space in a decompression storage chamber or a vacuum pump, and a pressure difference between a sealed space that is decompressed and a sealed space allows air to be placed in a sealed space from a gap in the sealed space. Next, in another embodiment (third embodiment), an embodiment in which the vacuum pump is opened without being pressed and the decompression operation in the decompression storage chamber 12 is performed without using the pressure switch will be described. state. Further, the component configuration is the same as that of the second embodiment. A timing chart of this embodiment is shown in Fig. 18, and a flow chart is shown in Fig. 19. First, the same operations as S01 to S07 described in the second embodiment are performed for the operations from S016 to S022. When the vacuum pump 14 is started (S020), and the operation continues until the fourth specific time, the fourth current value (I4) at that time is measured (S023). When the first current value (I1) and the low pressure determination value Y (S024) are compared, if I1 < Y, it is determined that the pressure is low, and the vacuum pump 14 is turned off (S025). If I1 ≧ Y, it is determined to be 0 kPa·G (atmospheric pressure), and the vacuum pump 14 is operated continuously. Until the third specific time (t3) (S026). Here, in the refrigerator of the present embodiment, the fourth specific time is set to a time within a range of 50% or less of the third specific time. As described above, the DC motor 14b used as the power source of the vacuum pump 14 increases the motor current in favor of an increase in the motor load. When the fourth specific time is set to be longer than 50% of the third specific time, the pressure is reduced by starting the pressure reduction from 0 kPa and G (atmospheric pressure), and there is no clear difference from the case where the pressure is reduced from the low pressure. It has become difficult. The transition of the current signal in this state is shown in Figure 20. As shown in Fig. 20, when the vacuum pump is started by 0 kPa and G (atmospheric pressure), when the vacuum pump is started by a low pressure, the fourth current value (I4) is larger than Y and is in an indeterminate state. On the other hand, when the fourth specific time is 50% or less of the third specific time, the fourth current value (I4) when the vacuum pump is started by 0 kPa and G (atmospheric pressure) is lower than the low pressure determination value Y, 0 kPa. The judgment of G (atmospheric pressure) and low pressure is possible. The transition of the current signal in this state is shown in Figure 21. By the above control, it is possible to provide a refrigerator which is configured with a simpler control and which does not use a pressure switch to determine the pressure in the decompression storage chamber 12. (Fourth embodiment) Next, a method of determining whether the pressure in the decompression storage chamber 12 is 0 kPa, G (atmospheric pressure) or low pressure by the number of revolutions of the DC motor 14b will be described. First, a characteristic diagram of a general DC motor is shown in FIG. The vertical axis shows the current [I] and the rotational speed [min^-1], and the horizontal axis shows the torque [mNm], and the torque indicates the weight of the load applied to the motor. According to the characteristic diagram shown in Fig. 22, the current [I] increases proportionally with the increase of the torque, and the rotational speed [min^-1] has a proportional characteristic. In the second and third embodiments, a description will be given of a low-voltage detecting method using the current [I]. In the present embodiment, a method of detecting a low voltage at a rotational speed [min^-1] will be described. A timing chart of low pressure detection control using the rotational speed [min^-1] is shown in Fig. 23, and a flow chart is shown in Fig. 24. Hereinafter, the operation will be described using FIG. 23 and FIG. The control flow is the same as S001 to S015 shown in the second embodiment, but the detection target is changed from the current to the rotation speed. Similarly to the second embodiment, when the first number of revolutions (N1) and the second number of revolutions (N2) are measured, and the difference ⊿N (S038) is calculated, and ⊿N<Z, the pressure in the decompression storage chamber 12 is determined as The vacuum pump 14 is turned off at a low pressure. (S014) In the case of ⊿N≧Z, the pressure in the decompression storage chamber 12 is determined to be 0 kPa·G (atmospheric pressure), and the vacuum pump 14 is continuously turned on until the third specific time (t3). (S041) By the above operation, the pressure in the decompression storage chamber 12 is estimated by the number of revolutions of the direct current motor 14b, and the operation of the wasted vacuum pump 14 can be suppressed. Thereby, by determining the pressure in the decompression storage chamber 12 without using the pressure switch, it is possible to provide a refrigerator having high reliability and reliability. Further, as means for detecting the number of revolutions of the direct current motor 14b, in the case of a DC brushed motor, it can be obtained from the frequency of the current of the motor. In addition, in the case of a DC brushless motor, a rotational speed signal (FG signal) is outputted on a built-in drive substrate, and the rotational speed can be detected by this. In any of the motors, when the low-voltage detection is performed by the rotation speed, the current amplification circuit 22 is not required, so that a cheaper low-voltage detection specification can be realized.

1‧‧‧ refrigerator body

2‧‧‧Refrigerator

2a‧‧‧Refrigerator door

2b‧‧‧ refrigerator door

3‧‧‧ ice making room

3a‧‧‧Ice door

4‧‧‧First freezer

4a‧‧‧The first freezer door

5‧‧‧Second freezer

5a‧‧‧Second freezer door

6‧‧ ‧ vegetable room

6a‧‧ vegetable door

7‧‧‧Refrigerator door switch

8‧‧‧First Freezer Door Switch

9‧‧‧Ice compartment door/second freezer door switch

10‧‧‧Vegetable room door switch

11‧‧‧Operator panel

12‧‧‧Decompression storage room

12a‧‧‧Decompression storage door

13‧‧‧ catheter

14‧‧‧vacuum pump

15‧‧‧micro computer

16‧‧‧DC motor

17‧‧‧Refrigerator temperature sensor

18‧‧‧ Pressure switch (pressure sensor)

Fig. 1 is a front view of a refrigerator in a first embodiment of the present invention. Fig. 2 is a front elevational view showing the removal of all the doors of the refrigerator of Fig. 1. Fig. 3 is a perspective view showing a state in which the vacuum pump and the duct are connected to the decompression storage chamber of Fig. 2. Figure 4 is a control block diagram of the present embodiment. Fig. 5 is a view showing the decompression characteristics of the vacuum pump 16 showing the principle of the present invention. Fig. 6 is a view showing the connection between the vacuum pump and the conduit and the decompression storage chamber in which the pressure detecting means is provided. Fig. 7 is a view showing the connection between the vacuum pump and the conduit and the decompression storage chamber in which the pressure detecting means is not provided. Fig. 8 is a basic control flow chart when the decompression operation is performed. Fig. 9 is a flow chart within the function of step S3 of Fig. 8 and step S33 of Fig. 10. Figure 10 is a flow chart within the function of step S28 of Figure 8. Fig. 11 is a view showing a pattern of decompression performance and air leakage of the vacuum pump 14. Fig. 12 is a timing chart showing an addition of an example of the operation of Figs. 8, 9, 10, and 11. Fig. 13 is a timing chart showing an addition of an example of the operation of Figs. 8, 9, and 10. Figure 14 is a control block diagram of the second embodiment. Figure 15 is a graph showing the decompression performance of a vacuum pump. Fig. 16 is a timing chart showing the basic control in the decompression operation of the second embodiment. Figure 17 is a flow chart showing the basic control of the decompression operation of the second embodiment. Fig. 18 is a timing chart showing the basic control in the decompression operation of the third embodiment. Fig. 19 is a flow chart showing the basic control of the decompression operation of the third embodiment. Fig. 20 is a view showing the transition of the current signal in the case where the fourth specific time is set to be longer than 50% in the third embodiment. Fig. 21 is a view showing the transition of the current signal in the case where the fourth specific time is set to be 50% or less in the third embodiment. Fig. 22 is a view showing the characteristics of the DC motor of the fourth embodiment. Fig. 23 is a timing chart showing the basic control in the decompression operation of the fourth embodiment. Fig. 24 is a flow chart showing the basic control of the decompression operation of the fourth embodiment.

Claims (8)

A refrigerator comprising: a refrigerating compartment; a storage compartment installed in the refrigerating compartment; and a decompression means for decompressing the storage compartment; and the decompression means is provided with a vacuum pump not having a pressure detecting means, and the refrigerating compartment is provided When the door opening time until the door opening time is equal to or longer than a certain time, the vacuum pump is operated for a specific time. The refrigerator according to claim 1, wherein when the door of the refrigerator compartment is opened during operation of the vacuum pump, when the door opening time is longer than the predetermined time, compared with when the door opening time is less than the predetermined time The driving time of the aforementioned vacuum pump from which the aforementioned refrigerating compartment door is closed is long. The refrigerator according to claim 1 or 2, wherein, when the door of the refrigerator compartment is opened during the operation of the vacuum pump, when the door opening time is longer than the predetermined time, the vacuum pump is closed after the refrigerator door is closed for the specific time When the door opening time is less than the predetermined time, the vacuum pump is turned off when the vacuum pump is driven to open the refrigerator door, and when the total time of the vacuum pump is turned off after the refrigerator door is closed. The refrigerator according to any one of claims 1 to 3, wherein the predetermined time is a specific value of 3 seconds or more. The refrigerator according to any one of claims 1 to 4, wherein the door of the refrigerator compartment is a double door left and right split mode, and the door opening time is a time when both the left and right doors are open. A refrigerator characterized by comprising a storage chamber and a decompression means for decompressing the storage chamber; and as the decompression means, a vacuum pump having no pressure detecting means, wherein the vacuum pump has a pump mechanism portion and a direct current for driving the pump mechanism portion The motor performs control of the vacuum pump based on a current flowing through the DC motor. A refrigerator characterized by comprising a storage chamber and a decompression means for decompressing the storage chamber; and as the decompression means, a vacuum pump having no pressure detecting means, wherein the vacuum pump has a pump mechanism portion and a direct current for driving the pump mechanism portion The motor controls the vacuum pump based on the rotational speed of the DC motor. A refrigerator characterized by comprising a storage chamber and a decompression means for decompressing the storage chamber; and as the decompression means, a vacuum pump having no pressure detecting means, wherein the vacuum pump has a pump mechanism portion and a direct current for driving the pump mechanism portion The motor is temporarily opened by the closing of the vacuum pump even in a state where the storage chamber is decompressed.