JPH0772661B2 - Freezer refrigerator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a freezer-refrigerator that includes two coolers and is capable of independently cooling two freezer compartments at different temperatures with one compressor.

<Prior Art> Conventionally, the temperature of the freezer compartment of a freezer-refrigerator has been set at about -18 ° C. However, even if frozen foods are stored at such temperatures, alteration of proteins, oxidation of fats and pigments, enzymatic reactions, etc.
Various deteriorations that affect the taste progress. It is known that it is desirable to store foods at a temperature as low as possible in order to suppress such deterioration as much as possible and enable the foods to be stored for a long period of time. Recently, even in the home refrigerator-
Some refrigerators have a deep freezer compartment of about 30 ° C, but in such a refrigerator / freezer, the cycle for cooling the refrigerator and the normal freezer compartment and the cycle for cooling the deep refrigerator compartment are completely separate, Equipped with two compressors.

<Problems to be Solved by the Invention> As described above, by using two compressors, it is possible to equip the refrigerator with a deep-freezing chamber, but since two compressors are used, the cost is low. Will increase. And not only the weight of the refrigerator must be increased, but also the space of the compressor must be increased. As described above, using two compressors causes various problems.

The present invention was created in view of the above circumstances, and
It is an object of the present invention to provide a freezer-refrigerator capable of independently cooling two freezer compartments at different temperatures with a single compressor.

<Means for Solving the Problems> In order to solve the above problems, a refrigerator-freezer according to the present invention includes a compressor, a condenser, a first capillary tube, a three-way valve, and an outlet of one of the three-way valves. A first cooler for cooling the first freezer compartment connected to the accumulator is annularly connected, and a second capillary is provided between the other outlet of the three-way valve and the outlet of the first cooler. Tube and second
In a freezer-refrigerator in which a second cooler that cools the freezer compartment is connected in series, a sensor that detects the temperature of the two freezer compartments, and a control device that controls the three-way valve according to the detection result of the sensor. In the initial cooling, the control device switches the three-way valve each time the temperature of each freezing chamber drops by a predetermined value, and alternately cools both freezing chambers until the temperature of both freezing chambers falls below a set value. However, in the subsequent normal operation, if the temperature of one of the freezer compartments rises above the set value, the three-way valve is switched to the side of the freezer compartment where the temperature rises, and the temperature of both freezer compartments exceeds the set value. When the temperature rises, the three-way valve is switched to the freezer side where the difference between the freezer temperature and the set value is larger.

<Operation> During initial cooling, the three-way valve is switched every time the temperature of each freezing chamber drops by a predetermined value, and both freezing chambers are alternately cooled until the temperature of both freezing chambers falls below the set value, and then normal operation is performed. Then, if the temperature of one of the freezer compartments exceeds the set value, the three-way valve is switched to the side of the freezer compartment where the temperature has risen to cool the freezer compartment, and the temperature of both freezer compartments exceeds the set value. When the temperature rises, the three-way valve is switched to the freezing compartment side where the difference between the freezing compartment temperature and the set value is larger to cool the freezing compartment. In this way, one compressor can independently cool two freezer compartments to different temperatures.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings. 1 to 3 are drawings for explaining one embodiment of the present invention. FIG. 1 is a diagram of a refrigerating cycle, FIG. 2 is a control flowchart, and FIGS. 3 (a) and 3 (b). ) Is a layout plan of various rooms showing an example of partitioning in a refrigerator-freezer.

In the refrigerator / freezer of this embodiment, as shown in FIG.
A normal freezing compartment A (first freezing compartment) is arranged at the uppermost part, and a deep-freezing compartment B (second freezing compartment) and a refrigerator, that is, a refrigerating compartment C and a vegetable compartment D are arranged in order below. Has been done. Further, as shown in FIG. 3 (b), a deep-freezing room B may be provided in a part of the normal freezing room A.

As shown in FIG. 1, the refrigeration cycle of the refrigerator-freezer of the present embodiment has a compressor 1, a condenser 2, a first capillary tube 3, a three-way valve 7, and a first outlet 7a of the three-way valve 7 connected to the first outlet 7a. The first cooler 4 and the accumulator 8 are connected in an annular shape, and the second capillary tube 5 and the second capillary tube 5 connected in series are connected between the other outlet 7b of the three-way valve 7 and the outlet of the first cooler 4. It has a refrigerating cycle to which the cooler 6 and the check valve 12 are connected. The check valve 12 prevents the refrigerant from flowing backward from the outlet side of the first cooler 4 to the second cooler 6. The first cooler 4 normally cools the freezer compartment A and the refrigerator, and the second cooler 6 cools the deep-freezer compartment B.

Reference numerals 9 and 10 denote first and second thermistors as sensors for detecting the temperatures of the normal freezing compartment A and the deep-freezing compartment B, respectively, and detect the temperatures of the normal freezing compartment A and the deep-freezing compartment B, respectively. . These thermistors are connected to the control device 11 of the refrigerator / freezer, and the control device 11 outputs the outlet of the three-way valve 7 to the first cooler 4 according to the temperatures detected by the first and second thermistors 9 and 10, respectively. And the command to switch to the side of the second cooler 6 is transmitted to the three-way valve 7.

Next, the control method of the refrigerator / freezer of this embodiment will be described with reference to the flowchart of FIG. In the description of this flow chart, Comp represents the compressor 1, and the three-way valve
The (1) side opening means that the three-way valve 7 opens to the first cooler 4 side, and the three-way valve (2) side opening means that the three-way valve 7 is at the second cooler 6 side. Indicates to open.

The power is turned on, and the compressor 1 is operated to start up the routine (x = 1) (steps 1 and 2, hereinafter referred to as S1 and 2). Next, the room temperature At 'of the normal freezer compartment A at this time,
After measuring the room temperature Bt ′ of the deep-freezing room B by the first thermistor 9 and the second thermistor 10, respectively (S3),
After opening the three-way valve 7 to the side of the first cooler 4 (S4), the room temperature At of the normal freezer compartment A at this time is measured again, and the room temperature At becomes below the set value or at S3. The compressor 1 is continuously operated until it becomes 5 ° C. lower than the stored room temperature At ′ (S5, 6). And when the room temperature At reaches the set value,
Or room temperature At when room temperature At becomes 5 ℃ lower than room temperature At ′
Is At ′ (S7).

Next, the three-way valve 7 is opened to the second cooler 6 side, and then (S
8) Measure the room temperature Bt in the deep freezer compartment B, and continue the compressor 1 until the room temperature Bt becomes lower than the set value or becomes lower than the room temperature Bt ′ measured and stored in S3 by 5 ° C. Drive (S9, 10). Then, the room temperature Bt when the room temperature Bt reaches the set value or when the room temperature Bt is lower than the room temperature Bt ′ by 5 ° C.
Bt ′ (S11). Then, until the room temperature At and the room temperature Bt reach the set values, the three-way valve 7 is alternately switched to cool the normal freezing compartment A and the deep-freezing compartment B alternately in sequence.

As described above, while both the room temperature At of the normal freezing room A and the room temperature Bt of the deep freezing room B are higher than the set value, S4 to S11 of the startup routine (x = 1) are repeated (S12, 15, 4). ~ 11).
When both the room temperature At and the room temperature Bt become equal to or less than the set values (S12), the compressor 1 is stopped (S13) and the normal routine (x = 2) is started (S14). In the start-up routine, the lowering temperature 5 ° C. of the freezing compartment, which serves as a reference at the time of switching the three-way valve 7, is not limited to this 5 ° C. and can be selected as an appropriate temperature other than 5 ° C. It is also possible to select different lowering temperatures for the normal freezing compartment A and the deep-freezing compartment B.

In the normal routine (x = 2), when the room temperature At is higher than the set value and the room temperature Bt is the set value or less (S12, 1
5) Open the three-way valve 7 to the first cooler 4 side to operate the compressor 1 (S16, 18, 20). When the room temperature Bt is higher than the set value and the room temperature At is equal to or lower than the set value, the three-way valve 7 is opened to the second cooler 6 side to operate the compressor 1 (S16, 1
9, 20). When both the room temperature At and the room temperature Bt are higher than the set values, the three-way valve 7 is opened on the side of the freezer compartment having the larger difference from the set values, and when the difference from the set values is the same. Operates the compressor 1 by opening the three-way valve 7 on the deep-freezing chamber B side (S16, 17, 18, 19, 20). And room temperature At and room temperature B
When both t and t are equal to or less than the set values, the compressor 1 stops operating (S12, 13). Thus, in the normal routine, S16
By repeating ~ 20, 12, and 13, it becomes possible to cool each freezer compartment to different temperatures independently.

<Effects of the Invention> As described above, the refrigerator-freezer according to the present invention includes the compressor, the condenser, the first capillary tube, the three-way valve, and the first outlet connected to one outlet of the three-way valve. The first cooler for cooling the freezer compartment and the accumulator are annularly connected, and the second capillary tube and the second freezer are provided between the other outlet of the three-way valve and the outlet of the first cooler. A refrigerating refrigerator in which a second cooler for cooling a chamber is connected in series, including a sensor that detects the temperature of the two freezing chambers, and a control device that controls the three-way valve according to the detection results of the sensors. The control device, at the time of initial cooling, switches the three-way valve every time the temperature of each freezing room falls by a predetermined value, and alternately cools both freezing rooms until the temperature of both freezing rooms becomes equal to or lower than a set value, In normal operation after this, either one of When the temperature of the freezer compartment rises above the set value, the three-way valve is switched to the side of the freezer compartment where the temperature has risen, and when the temperature of both freezer compartments rises above the set value, the temperature of the freezer compartment and the set value The three-way valve is switched to the side of the freezer compartment where the difference between the two is larger. Therefore, it is possible to independently cool these freezer compartments to different temperatures with one compressor. As a result, it is possible to provide a freezer-refrigerator that has a low cost and does not increase the weight or occupied space of the compressor despite having two freezer compartments. Further, since this freezer-refrigerator is configured to alternately cool the two freezing compartments each time the temperature drops by a predetermined value during the initial cooling, the two freezing compartments are cooled to some extent even during the initial cooling. The freshness of the stored food can be maintained. Furthermore, in normal operation, this freezer-refrigerator can cool two freezer compartments to a predetermined temperature by preferentially cooling the higher freezer compartment, so it is suitable for storing food products. .

[Brief description of drawings]

1 to 3 are drawings for explaining one embodiment of the present invention. FIG. 1 is a diagram of a refrigerating cycle, FIG. 2 is a control flowchart, and FIGS. 3 (a) and 3 (b). ) Is a layout plan of various rooms showing an example of partitioning in a refrigerator-freezer. 1 ... Compressor, 2 ... Condenser, 3 ... First capillary tube, 4 ... First cooler, 5 ... Second capillary tube, 6 ... Second cooler, 7 ... … Three-way valve,
7a ... one exit, 7b ... other exit, A ... first freezer compartment, B ... second freezer compartment.

Front Page Continuation (72) Inventor Hideaki Okuda 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Within Sharp Corporation (56) References JP-A-58-198667 (JP, A) JP-A-59-217470 ( JP, A) JP 58-198668 (JP, A) Actually developed 57-33968 (JP, U)

Claims (1)

[Claims] 1. A compressor, a condenser, a first capillary tube, a three-way valve, a first cooler for cooling a first freezing chamber connected to one outlet of the three-way valve, and an accumulator. Is connected in an annular shape, and the second capillary tube and the second cooler for cooling the second freezer are connected in series between the other outlet of the three-way valve and the outlet of the first cooler. The refrigerator-freezer includes a sensor that detects the temperatures of the two freezer compartments, and a control device that controls the three-way valve according to the detection results of the sensors. Each time the temperature of the freezer drops by a predetermined value, the three-way valve is switched to cool both freezer compartments alternately until the temperature of both freezer compartments falls below the set value, and in the subsequent normal operation, one of the freezer compartments is cooled. If the temperature rises above the set value, the temperature Switch the three-way valve to the freezing room side, and if the temperature of both freezing rooms rises above the set value, switch the three-way valve to the freezing room side where the difference between the freezing room temperature and the set value is larger. Refrigerator and refrigerator characterized by.