JPS59200174A - Freezing refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Technical fields> The present invention relates to a refrigerator-freezer.

<Prior art> Conventionally, a freezer and a refrigerator are connected to each other by a cold air duct, and a quick-freeze box is installed in the freezer. When performing quick freezing in a refrigerator-freezer that forcibly circulates cold air between the cold air duct and the refrigerator compartment, the compressor is short-circuited for a set time by operating the start button from the outside, and then It was cumbersome because it was canceled at the set time or by the operator checking the food inside, and even though the food inside had already been frozen,
In many cases, the compressor was forced into unnecessary short-circuit operation.

In view of the above, an object of the present invention is to provide a refrigerator-freezer that automatically performs quick freezing and can omit external operations.

<Embodiment> Hereinafter, an embodiment of the present invention will be explained based on FIGS. 1 to 5. In FIG. The freezer compartment 3 is divided into a refrigerator compartment 4 at the bottom thereof, and an evaporator 6 is disposed at the rear of a cold air circulation passage 5 at the bottom of the freezer compartment 3, and a blower fan 7 is disposed above it. There is. Further, a vertical cold air duct 8 is formed at the rear of the main body 1 to communicate the freezer compartment 3 and the refrigerator compartment 4, and a damper device 9 for opening and closing the cold air duct 8 is provided at the bottom of the cold air duct 8. . Further, in the upper part of the freezer compartment 3, a quick freezing box 11 is installed in front of the air blower 7 through a louver 10, and the quick freezing box 11 has a food loading/unloading layer 12 on the front side as shown in FIG. is attached so as to be openable and closable, and a cold air inlet 13- for introducing cold air from the blower fan 7 is provided on the rear surface. Further, a food plate 15 is placed on the bottom plate 14 of the quick freezing box 11.
A cold air outlet 16 is formed in the front part of. Further, in the quick freezing box J1, a case 18 with a ventilation hole 18a is formed on the mouth wall of the cold air intake 13, and a case 18 is provided with a vent hole 18a, which houses a first temperature sensor 17 for sensing the temperature on the cold air inlet side. A vent hole 2Qa ('' case 20 is provided in the front part of the body 1 on the side of the refrigerator compartment 4. A case 20 is provided in the front part of the body 1 on the side of the refrigerator compartment 4. A third temperature sensor 21 is provided to detect the temperature inside the box.Then, cold air is sent from the evaporator 6 to the quick freezing box 1.
1, circulates through the freezer compartment 3, and also enters the refrigerator compartment 4 from the cold air 18, and returns to the evaporator 6 again.

Further, the opening/closing operation of the damper device 9 is controlled by a control device 22. As shown in FIG. 4, this control device 22 includes a general one-chip microcomputer (hereinafter referred to as Yaifun) 23, which has a program ROM, data RAM, and ALU, and is driven by a reference clock oscillator 24. It will be rejected. The input section of this microcomputer 23 is the first temperature sensor 17 (thermistor).
, a second temperature sensor (thermistor) 19, a third temperature sensor (thermistor) 21, and a temperature setting variable resistor 25. Signals from these are converted into digital values by an A/D converter 26, and the signals from these are converted into digital values by the microcomputer 23. is input. Further, the microcomputer 23 receives a signal from an external operation section 28 for manual setting provided on the refrigerator/freezer door section 27 . Note that the second temperature sensor 19 also serves as a temperature sensor for the freezer compartment 3 for controlling the operation of the compressor 29. Furthermore, microcontroller 23
A compressor 29 for feeding refrigerant into the evaporator 6 is connected to the output section of the evaporator 6, and a stepping motor 3 of the damper device 9 is connected to the
Four transistors TRI to TR4 that drive 0 are connected and operate to send a predetermined number of pulses. The control device 22 also controls the second temperature sensor 19 in the normal state.
The third temperature sensor 21 detects the temperature of the freezer compartment 3 and controls the compression intermittently, and the third temperature sensor 21 detects the temperature of the refrigerator compartment 4 and opens and closes the damper device 9 to control the temperature inside the refrigerator compartment 4. However, when food is placed in the quick freezing box 11 and the temperature difference T between the first temperature sensor 17 and the second temperature sensor 19 exceeds a large set value A, the damper device 9
T to the temperature difference between the surface temperature sensors 17 and 19.
The damper device 9 is configured to open when the second set value B (zero) is exceeded.

As shown in FIG. 4, the damper device 9 includes the stepping motor 30, a shaft 30a rotated by the motor 30, and a damper 3 mounted on the tip of the shaft 30a.
It is constructed from 1. In addition, the compressor 29 is controlled ON-OFF by the second temperature sensor 19 in the normal state, and when it enters rapid freezing, the first and second temperature sensors 17
．． The operation is controlled by T to a temperature difference of 19.

Next, the operation of automatic rapid freezing will be explained based on FIGS. 3 and 5. Figure 3 shows the first and second temperature sensors 1 of the quick freezing box 11.
The vertical axis represents the temperature detected by 7.19, the horizontal axis represents the elapsed time, and the open/closed states of the damper 31 are shown below. In the figure, θ1 indicates the temperature of one second temperature sensor 17 on the cold air inlet side, and θ2 indicates the temperature of the first temperature sensor 17 on the cold air outlet side. FIG. 5 is a flowchart showing the rapid freezing operation. Now, when the refrigerator-freezer is in normal operation, as shown in FIG. 3, there is no load in the quick-freezing box 11, so the cold air inlet and outlet temperature θ1. θ
2 are almost equal, and the temperature difference ΔT does not exceed the -th set value A. Therefore, rapid freezing is not performed, and normal operation is performed.

That is, the microcomputer 23 detects the temperature of the freezer compartment 3 with the second temperature sensor 9 and controls the operation of the compressor 29, detects the temperature of the refrigerator compartment 4 with the third temperature sensor 21, and controls the damper device 9 to open and close normally. Have them do the action.

Next, when food to be quickly frozen (at room temperature) is placed in the quick-freezing box 11, the heat generated from the food causes a temperature difference ΔT between the temperature θ1 and θ2 of the cold air flowing into and out of the quick-freezing box 11.
I can do it. The inflow temperature of cold air is measured by the first temperature sensor 17.
The outflow temperatures are detected by the second temperature sensors 19 and inputted to the microcomputer 23 of the controller 22. Rapid freezing is started from the time t1 when the temperature difference ΔT exceeds the S-set value A. First, the damper 31 of the refrigerator compartment 4 is
The motor 30 is driven by the signal from 2 to completely close it. When this drive signal is sent out for a certain period of time (3 to 5 seconds) and the damper 31 is completely shut off, the microcomputer 23 controls the two compressors to operate continuously. Therefore, the cold air does not go to the refrigerator compartment 4, but all circulates within the freezing compartment 3, and the food in the quick-freeze box 11 is quickly frozen. Then, the food is cooled little by little, and the heat generated from the food decreases, and when the temperature difference ΔT approaches zero and becomes equal to or less than the second set value B, the control device 22 determines that the quick freezing has ended.
is to judge. Assuming that this time point is t2, normal operation resumes after this point. That is, the third temperature sensor 21 detects the temperature inside the refrigerator compartment 4, and the damper 31 opens again. In this way, the quenching operation is automatically performed without any external confirmation of quenching settings and completion. In addition, during rapid cooling operation (tl~
At t2), the compressor 29 is in continuous operation.

<Effects> As is clear from the above description, the present invention provides a forced circulation refrigerator-freezer that includes a damper device for opening and closing a cold air duct, a first temperature sensor disposed on the cold air inlet side of a quick freezing box, and a first temperature sensor disposed on the cold air inlet side of a quick freezing box. A second temperature sensor disposed on the cold air outlet side of the freezer box and a control device that controls opening and closing operations of the damper device are provided, and the control device controls the temperature of the first temperature sensor and the second temperature sensor. The damper device is configured to close the damper device when the difference exceeds a second set value, which is larger, and to open the damper device when the temperature difference of the surface temperature sensor exceeds a second set value, which is smaller. It is.

Therefore, according to the present invention, since a series of rapid cooling operations can be automatically performed by the first and second temperature sensors at the entrance and exit of the quick freezing box, there is an excellent effect that external operations can be omitted.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention,
Figure 1 is a longitudinal cross-sectional view of the refrigerator-freezer, Figure 2 is a perspective view of the quick-freezing box, and Figure 3 is the relationship between the temperature sensed by the first temperature sensor and the second temperature sensor and time during quick freezing, and the relationship therewith. Fig. 4 is a circuit diagram of the damper control device, and Fig. 5 is a diagram showing the opening/closing operation of the damper.
It is. 1: Refrigerator-freezer body, 2: Partition wall, 3: Freezer compartment, 4: Refrigerator compartment, 6: Evaporator, 7: Blower fan, 8: Cold air duct,
9: Damper device, 17: First temperature sensor, 19: Second temperature sensor, 21: Third temperature sensor blade - 123: Microcomputer, 29: Compressor, 30: Motor, 31
:Damper. Applicant Sharp Corporation Agent Tsunehisa Nakamura

Claims (1)

[Claims] It includes a freezer compartment (3) and a refrigerator compartment (4) that communicate with each other through a cold air duct (8), and a quick freezing box (11) installed in the freezer compartment (3), and a fan (7) that blows cold air. According to
In a refrigerator-freezer that forcibly circulates among an evaporator (6), a quick-freeze box (11), a freezing compartment (3), a cold air duct (8), and a refrigerator compartment (4), the cold air duct (8) is opened and closed. a first temperature sensor (17) placed on the cold air inlet side of the quick freezing box (11), and a second temperature sensor (17) placed on the cold air outlet side of the quick freezing box (11). A sensor (19) and a control device (22) that controls the opening/closing operation of the damper device (9) are provided, and the control device (22) includes the first temperature sensor (17) and the second temperature sensor ( When the temperature difference (8T) between the two temperature sensors (17, 19) exceeds the large set value (A), the damper device (9) is closed and the temperature difference (△T) between the two temperature sensors (17, 19) is closed. ) exceeds a smaller second set value (B), the damper device (9) is opened.