JPS6199077A - Operation controller for 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] Industrial applications The present invention relates to operational control of a refrigerator-freezer.

The structure of a conventional example and its problems A conventional refrigerator-freezer will be explained with reference to FIGS. 5 to 8.

1 is a refrigerator-freezer formed by a main body 2, upper and lower doors 3, 4, and a machine room 5. Further, a partition plate 6 is provided in the center of the main body 2 to divide the main body 2 into upper and lower halves, and a freezer compartment 7. A refrigerator compartment 8 is formed. Furthermore, inside the partition plate 6, there is a door 3.
Viewed from the side, install the evaporator 9 degrees and the fan motor 10 in this order.
In addition, there are suction ports 11 and 12 on the door 3 and 4 sides of the partition plate 6, and each freezer compartment 7. Discharge ports 13 and 14 are provided on the back side of the refrigerator compartment 8.

Further, a temperature sensor 21 is provided near the discharge port 13 of the freezing chamber 7. Further, a compressor 15 is installed in the machine room 6.

Next, the cooling stem will be explained. The refrigerant compressed by the compressor 16 is sent to the condenser 16. Solenoid valve 17. A circuit is formed in which the liquid passes through the capillary tube 18, is evaporated in the evaporator 19, and returns to the compressor 16 through the check valve 2o.

Next, the operation control circuit will be explained.

22 is a control circuit that controls the operating mode of the refrigerator. Built inside the control circuit 22 is a quick freeze switch 26 having a switch 23 and a timer 24 which are turned on and off by a temperature sensor 21 that detects the temperature of the freezer compartment 7. This control circuit 22 is connected in series to a power supply. In addition, a compressor 16. While connecting each of the fan motor 10° solenoid valve 17,
Bypassing switch 23, timer 24. A quick freeze switch 25 is provided, and the compressor 16. Fan motor 10. It controls the solenoid valve 17.

The operation of the conventional refrigerator configured as described above will be explained using the timing chart shown in FIG. , 0N-OFF command to the compressor 16. Fan motor 10. It is sent to the electromagnetic valve 17 to control the capacity of the cooling system and maintain the refrigeration v7 at the set temperature. Furthermore, the temperature of the refrigerator compartment 8 is controlled by a damper 14' that adjusts the area of the discharge port 14.
The temperature is maintained at the set temperature.

In other words, at the point in time when the temperature of the freezer compartment 7 becomes lower than the set temperature,
Since the switch 23 is turned on, the compressor 16° and the fan motor 10. Since the solenoid valve 17 turns on and starts L cooling, each chamber 7
．． At 8, the temperature begins to drop. When the temperature drops below the set temperature (at time t2'), the switch 23 turns OFF.
Compressor 16. Fan motor 10. Turn off solenoid valve 17
Therefore, cooling of each chamber 7, 8 is stopped, and the temperature of each chamber 7, 8 gradually rises. Repeat this operation until the freezer compartment 7. The refrigerator compartment 8 is maintained at a set temperature.

Next, the operation when the quick freeze switch 26 is turned on will be explained. This quick-freeze switch 26 is used when home-freezing food.When the quick-freeze switch 26 is turned on (at time t3'), the timer 24 is energized, and the compressor 16. The fan motor 10 and solenoid valve 17 are turned on. At this time, the quick freeze switch 25. Timer 24 is switch 23
Since the temperature is bypassed, regardless of the temperature of the freezer compartment 7,
The compressor 15. Fan motor 10. The solenoid valve 17 is continuously energized for a certain period of time by the timer 24, and the freezer compartment 7. Cool the refrigerator compartment 8. Therefore, the evaporation temperature in the evaporator 9 becomes lower, and the discharge air temperature decreases. For this reason, the temperature of the cold air that hits the food is lower, so the time required for 7 reaging can be shortened, and the food can be preserved in better quality.

After a certain period of time has elapsed, at time t4' when the temperature of the freezer compartment 7 has dropped to below -30"C and the temperature of the refrigerator compartment has dropped to around 0'C, the timer 24 activates the compressor 15, fan motor 10.
．． The solenoid valve turns OFF and stops cooling. For this reason, the temperature in each compartment 7.8 increases from the point 1, /, and at the point 16 when the temperature in the freezer compartment 7 slightly exceeds the set temperature.
Since the switch 23 is turned on at /, the compressor 15. Fan motor 10. The solenoid valve 17 enters ONL cooling operation, and thereafter is controlled ON-FF by the switch 23 to maintain the set temperature.

However, in conventional refrigerators, the compressor 15 is only continuously energized for a certain period of time by the quick freeze switch 25, and the output of the compressor 15 is not much different from that during normal operation, so It took a long time to freeze quickly.

For this reason, the freshness of frozen foods has deteriorated.

In addition, since the compressor 16 operates for a long time, the noise from the refrigerator continues for a long time during quick freezing. Generally, the opening adjustment of the dunners 14' is a bellows type, and with this method, it is impossible to completely shut off the opening 14, and if the compressor 16 is operated for a long time, cold air will flow into the refrigerator compartment 8. As a result, the temperature in the refrigerator compartment 8 dropped to below 0°C, causing food placed in the vicinity of the opening 14 to freeze, and pins to freeze, causing bottles to break.

Purpose of the Invention Therefore, the present invention has been proposed to perform rapid freezing by controlling the output of the compressor to be high and the rotation of the fan motor to be high during rapid freezing, thereby shortening the time required for rapid freezing. In addition to maintaining the freshness of stored foods, this system also prevents foods in the refrigerator from freezing during quick freezing.

Structure of the Invention In order to achieve this object, the refrigeration cycle is operated based on a command to make the output of the compressor larger than the normal output from the time the quick freeze switch is activated, and the rotation of the fan motor is changed to the normal operation. By increasing the rotational speed of the fan motor based on a command to increase the rotational speed compared to the previous one, rapid freezing can be completed in a short period of time.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. Note that the same configurations as those of the prior art are given the same numbers, detailed explanation thereof will be omitted, and only the different points will be explained.

26 is a control circuit that controls the operating mode of the refrigerator. Inside the control circuit 26, there is a quick freeze switch 2 which has a switch 23 and a timer 27 which are turned on and off by a temperature sensor 21 that detects the temperature of the freezer compartment 7.
6 and the compressor 28 are connected via a frequency control circuit 30 for controlling the rotation speed of the variable speed compressor 28. The quick freeze switch 26 and the timer 27 are connected to bypass the switch 23. Further, 29 is a variable speed type 7mm motor, which has two types of winding resistance, and contacts 29a, 29 to change the winding resistance value.
b. The fan motor is designed so that the number of rotations of the fan motor becomes a large value at the contact point 29a, and the same rotation speed as the conventional one at the contact point 2sb.

A contact point 29b of the fan motor 29 is connected in series with the switch 23, and a solenoid valve 17 is connected in series with the switch 23 as well. Further, a contact point 29a of the fan motor 29 is connected in series with the quick freeze switch 26 and the timer 27, and a solenoid valve 17 is connected in series with the quick freeze switch 25 and the timer 27.

Next, the operating state of this control circuit will be explained using a timing chart.

During normal operation, the quick freeze switch 26 is in the OFF state, and the compressor 28. Fan motor 29. The solenoid valve 17 stops operation based on the signal from the switch 23. When the temperature of the freezer compartment reaches or exceeds the set temperature, the switch 23 turns ON, (t
1), the solenoid valve 17 is ON, the fan motor 29 is applied with voltage at the contact 29JC, and rotates at the same number of rotations as the conventional fan motor 10. Regarding the compressor 28,
It passes through the frequency control circuit 30 and is operated by inputting frequencies around the commercial frequency. That is, during normal operation, the compressor 28 is operated at a frequency close to the commercial frequency, so that the same operating state as that of a conventional refrigerator can be ensured. Then, each chamber 7.8 is cooled, and the time point t2 when the temperature becomes below the set temperature.
Compressor 28. Fan motor 29. Solenoid valve 17 stops. By repeating this cycle, each chamber 7, 8 is maintained at a stable temperature.

Next, the operation when the quick freeze switch 25 is turned on will be explained.

At time t3 when the quick freeze switch 25 is turned on, the switch 2 is turned on.
3 is bypassed, timer 27 is turned on and solenoid valve 1 is turned on.
7 is opened, voltage is applied to the contact 29a of the fan motor 29, and the fan motor 29 starts rotating at high speed. Further, the highest frequency command is issued to the compressor 28 by the frequency control circuit 3o, the rotation speed of the compressor 28 increases in proportion to the frequency, and the refrigeration output increases approximately in proportion to the rotation speed increase rate. become. In other words, the amount of air blown to each chamber 7, 8 increases, and the output of the compressor 28 also increases.

Therefore, the temperature drop characteristic of the food to be rapidly frozen becomes steeper than the conventional temperature drop characteristic. In other words, the time t when rapid freezing started
3 to time point t4 when the desired temperature is reached, and the setting of the timer 27 can also be shortened.

Then, at time t4 by the timer 27, the compressor 28 and the fan motor 29 are stopped, and the temperature inside the refrigerator increases. Then, at time t5, cooling is started again.

The rest is the same as a conventional refrigerator, so the explanation will be omitted.

As mentioned above, during quick freezing, the compressor 28 is operated at high output and the amount of air blown to each chamber 7.8 is increased, so the freezing speed of the food is improved and the freshness of the food is maintained during freezing. will be able to maintain it in good condition.

In addition, by shortening the quick freezing time, it is not only possible to make the refrigerator compartment 8 less likely to freeze, but also because the time required for quick freezing is shortened. The duration time of the operating sound of the compressor 28 is also shortened, and noise reduction can also be achieved.

Effects of the Invention As described above, the present invention provides that when the quick freeze switch is activated,
The control circuit gives a command to increase the output of the cooling system's compressor higher than the normal output, and the fan motor that blows air into each room has a high rotation speed to improve quick freezing performance. Completes rapid freezing in a short time.

As a result, not only can the freshness of the food to be frozen be maintained well, but it is also effective in preventing the refrigerator compartment from becoming too cold during rapid freezing, and the operating noise of the compressor can be shortened and reduced in noise.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram of the refrigerator of the present invention, and Fig. 2 is the electrical circuit diagram of the refrigerator of the present invention.
Fig. 3 is a central sectional view of the refrigerator using Fig. 1, Fig. 4 is a cooling system diagram of Fig. 3, Fig. 6 is a central sectional view of a conventional refrigerator, Fig. 6 is a Figure 6 is the electrical circuit diagram of the main parts, Figure 7 is the cooling system diagram of Figure 5,
FIG. 8 is a timing chart during operation of a conventional refrigerator. 21...Temperature sensor, 23...Switch, 25...Quick freeze switch, 27...
Timer, 28... Compressor, 29...
Fan motor, 30... Frequency control circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 48

Claims (1)

[Claims] A variable rotation speed fan motor that circulates cold air, a variable capacity compressor, a quick freeze switch that provides a signal to continuously energize the fan motor and the compressor for a predetermined period of time, and only when the quick freeze switch is in operation. An operation control device for a refrigerator-freezer, which has a circuit that controls the compressor output to the maximum output and the fan motor rotation to high speed rotation.