JPS61191856A - 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 Field of Industrial Application The present invention relates to a refrigerator-freezer having a quick freezing function.

BACKGROUND OF THE INVENTION In recent years, there has been an increasing need for quick freezing functions such as home freezing as a function of refrigerator-freezers.

Hereinafter, an example of the above-mentioned conventional refrigerator-freezer will be described with reference to FIGS. 8 to 12.

FIG. 8 is a central sectional view of a conventional refrigerator-freezer, and FIG. 9 is a perspective view of the main parts.

1 is a refrigerator-freezer formed by a main body 2, upper and lower doors 3, 4, and a machine room 6. Further, a partition plate 6 is provided near 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. A cooling chamber 1o is formed by a back plate 9 on the inner side of the freezing chamber 7, and a fan motor 11 for blowing air and an evaporator 12 are installed vertically within the cooling chamber 10.

A fan ring 13 is installed around the blades 11' of the fan motor 11 for blowing air, and a discharge grill 1 is installed in the front.
4, and a bottom plate 16.4 is provided in front of the discharge grille 14. Side plate 16
A quick-freezing chamber 18 formed by a front door 17 having a hole 17' in the upper part is installed. The discharge grille 14 has openings 14a and 14b.

14c is provided with an opening 14b, and 14c opens toward the quick-freezing chamber 18. Further, near the right end of the fan ring 13, a duct guide 19 is provided for blowing cold air to the refrigerator compartment 8. A suction port 20 is installed near the door 3 of the partition plate 6, and a suction port 21 is installed near the door 4.
are in communication with the cooling chamber 10, respectively. And the opening 14
A thermostat 22 for detecting the temperature inside the refrigerator is provided in front of the refrigerator.

Further, a discharge port 23 is provided on the back surface of the refrigerator compartment 8, and the opening area of the discharge port 23 is adjusted by the damper thermometer 24 to adjust the amount of cold air discharged. The discharge port 23 is continuous with the duct guide 19 via a duct 26.

Next, the cooling system will be explained. The refrigerant compressed by the compressor 26 is sent to the condenser 27. A circuit is formed in which the liquid passes through the capillary tube 28, is evaporated in the evaporator 12, and returns to the compressor 26.

Next, the operation control circuit will be explained. thermostat 2
A fan motor 22 for blowing air and a compressor 26 are connected in series to the fan motor 11 . It is connected to the compressor 26. The quick freeze switch 29 controls the ON time of the quick freeze switch 29 using a timer 30 to regulate the quick freeze time.

The operation of the conventional refrigerator configured as described above will be explained using a timing chart.

When the quick freeze switch 29 is OFF, the temperature of the freezer compartment 7 is detected by a temperature sensing element (not shown), and the thermostat 22 is
The ON-OFF control controls the compressor 26.7, the unmotor 1'1, and the capacity of the cooling system to maintain the freezer compartment 7 at the set temperature. The thermostat 22 is turned off at time t when the temperature of the frozen compartment 7 becomes lower than the set temperature, so the compressor 26. Since the fan motor 11 for blowing air reaches 0FFL and stops cooling, the temperature of each chamber 7.8 begins to rise. Then, when the set temperature is exceeded (at time t2), the thermostat 22 is turned on, and the compressor 26 and fan motor 11 for blowing air are turned on, so each room 7.8 starts to be cooled, and the temperature of each room 7, 8 decreases. do. Repeat this operation until the freezer compartment 7. The refrigerator compartment 8 is maintained at a constant temperature.

Next, the operation when the quick freeze switch 29 is turned on will be explained. This quick freeze switch 29 is used when home freezing food, but the quick freeze switch 26 is turned off.
If N (at time t, 40), the timer 30 is energized and the compressor 26. The fan motor 11 for blowing air is turned on. At this time, since the quick-freeze switch 29 bypasses the thermostat 22, the compressor 26. The fan motor 11 for blowing air has a timer 30
Electricity is continuously applied for a certain period of time, freezing compartment 7° and refrigerator compartment 8.
to cool down. Therefore, the air temperature at the suction ports 20 and 21 of each chamber becomes low, the evaporation temperature of the evaporator 12 becomes lower, and the discharge air temperature decreases. Therefore, the temperature of the cold air that hits the food is lower, so the time required for reaging can be shortened, and the food can be frozen and preserved with better quality.

After a certain period of time has passed, the temperature of the freezer compartment 7 and quick-freeze compartment 18 drops to around -30°C, and at time t6, when the temperature of the refrigerator compartment 8 drops to around 0°C, the timer 30 turns on the compressor 26.
．． The air blower motor 11 reaches 0FFI and stops cooling. Therefore, the temperature of each compartment 7.8 increases from time t6, and when the temperature of freezer compartment 7 slightly exceeds the set temperature (time 16), the thermostat 22 turns ONL, and the compressor 26° blows again. The fan-motor 11 enters ONL cooling operation, and thereafter is turned 0N-OFF by the thermostat 22.
The temperature of each chamber 7, 8 is maintained at the set temperature.

Problems to be Solved by the Invention However, with the above configuration, the volume of cold air discharged is small and the speed of cold air hitting the food to be frozen is low, so it is difficult to use a fan ring (for example, to lower the temperature of food to -16°C and freeze it). The time required is long, the destruction of cells such as meat is promoted, and good frozen preservation is not possible, and the rapid freezing timer 3
Since the setting time of o is long, the amount of cold air discharged to the refrigerator compartment 8 side also increases, resulting in the problem that food near the damper thermometer 24 freezes.

In view of the above-mentioned problems, the present invention provides a refrigerator-freezer that shortens the time required for freezing, maintains the frozen freshness of foods at a high quality, and prevents overcooling of the refrigerator compartment.

Means for Solving the Problems In order to solve the above problems, the refrigerator-freezer of the present invention is provided with a quick-freezing fan motor in the deep part of the quick-freezing chamber, and a quick-freezing fan motor and a quick-freezing fan motor only during quick freezing. Both of the 77 motors for air blowing are energized to increase their weight, and the variable capacity compressor is operated at its maximum capacity. In addition, during quick freezing operation, the temperature of the refrigerator compartment is detected by a sensor, etc., and if the freezing temperature reaches 0℃ or less, the fan motor is stopped and the cold air is not discharged to the cold room side. be.

Effect The present invention has the above-described configuration to ensure maximum cooling capacity during quick freezing operation, shorten the time required for freezing, produce high quality frozen foods, and prevent abnormally low temperatures in the refrigerator compartment during quick freezing. Since the blower fan motor is controlled by temperature detection, the food in the refrigerator compartment will not freeze.

EXAMPLE Hereinafter, a refrigerator-freezer according to an example of the present invention will be described with reference to the drawings.

Incidentally, the same components as those in the prior art are designated by the same reference numerals, detailed explanation thereof will be omitted, and only the different points will be explained.

FIG. 2 shows a central sectional view of a refrigerator-freezer according to an embodiment of the present invention. At the back of the freezer compartment 7, there is a back plate 9.
A cooling chamber 1o is formed by installing a fan motor 31 for blowing air and a 77° motor 32 for quick freezing on the left and right sides, and an evaporator is installed below each fan motor 3, 1.32. 12 are installed.

A blade 31' is provided at the tip of the shaft 31a of the fan motor 31 for blowing air, and a fan ring 33 for blowing air is provided around the blade 31'.
has been established. Further, on the right side of the fan motor 31 for blowing air, there is a fan motor 32 for quick freezing. It penetrates. A blade 32' is provided at the tip of the rotating shaft 32a of the fan motor 32 for quick freezing.
is installed, and a fan ring 3 for quick freezing is installed around it.
There are 4. Further, the quick freezing fan ring 34 is
It also serves as a duct cover for the blower fan motor 31.
A hole 34' for discharging air into the freezer compartment is opened in front of the 71-inch motor 31 for blowing air. On the other hand, a quick-freeze grill 36 is provided in front of the quick-freeze ring 34, and a bottom plate 15 is provided in front of the quick-freeze fan motor 32. A quick-freezing chamber 18 is installed which consists of a side plate 16 and a front door 17 having a hole 17' in the upper part.

Further, a temperature sensor 36 is provided near the center of the refrigerator compartment 8.

Reference numeral 37 denotes a rotation speed control circuit for controlling the capacity of a variable capacity compressor 38 of the cooling system, and is connected in series to the compressor 38. In addition, 39 is the first switch 3 that is interlocked.
9', a quick freeze switch consisting of a second switch 39'' and a timer 40.

The quick-freezing fan motor 32 is connected to the power supply in series with the first switch 39', and the blower fan motor 31 is connected in series with the second switch, bypassing the thermostat 22, and turning on the signal of the temperature sensor 36. It is connected via a switch 41 that opens and closes depending on the timing. Further, the second switch 39'' and the rotation speed control circuit 37 are connected in series.

The switch 41 is set to turn off at 0°C and turn on at 5°C. - Next, the operating state of this refrigerator-freezer will be explained using a timing chart.

First, the case when the outside temperature is high or the door of the refrigerator compartment 8 is opened and closed frequently will be explained with reference to FIG. 6.

When the quick freeze switch 39 is OFF, the same control as the conventional one is performed (70' to t4'). And quick freeze switch 3
At the time t4' when 9 is turned on, the fan motor 31 for cooling the fan 31 degrees rapidly starts blowing air, regardless of the signal from the thermostat 22. At the same time, the rotational speed control circuit 37 sends a command to the compressor 38 to increase the rotational speed of a piston (not shown) of the compressor 38 to reach the maximum rotational speed during rapid freezing. In other words, by increasing the amount of refrigerant circulating per unit time in the refrigeration cycle, normal operation (
This ensures a higher capacity than when the quick freeze switch is OFF. Therefore, since the temperature of the quick-freezing chamber 19 can be lowered in a shorter time than in the past, the setting time of the timer 4o can be set short. Then, at the time point t6' when a certain period of time has elapsed,
Compressor 38. Fan motor for blowing air 31. The fan motor 32 for rapid freezing stops, and the temperature of each chamber 7, 8 rises.

Then, when the temperature becomes slightly higher than the set temperature,
The thermostat 22 causes the compressor 38. The fan motor 31 for blowing air is turned on.

The following cycle is repeated as before.

Next, quick freezing operation at a low load such as when the outside air temperature is low will be explained using FIG. 7.

When the quick freeze switch 39 is turned on, the fan motor 3 for blowing air
1. The fan motor 32 for quick freezing is ONL, and the compressor 38 is operated at the highest frequency (t4//). At this time, since the load is low, the temperature of the refrigerator compartment 8 becomes lower rapidly.
The freezing point of 0° C. is reached (at time t6').

At this time, the switch 41 is turned off, so the fan motor 31 for blowing air is stopped. Therefore, air is no longer blown to the refrigerator compartment 8 side, and the temperature of the refrigerator compartment 8 does not fall below 0°C. Then, the temperature of the refrigerator compartment 8 gradually rises, and is turned off until it reaches 6° C. ((7#)).

After the sudden freezing starts, the quick freezing switch is automatically turned off by the timer 40 and the sudden freezing is canceled (16//). Tsumashi compressor 38. Fan motor for blowing air 31. The quick freezing 7 unmotor 32 stops, and the temperature of each chamber 7, 8 rises.

After that, the same cycle as before is repeated.

As described above, according to this embodiment, the quick freeze switch 39 is turned on.
Then, the piston rotation speed of the compressor 38 is controlled to the maximum, and the 7-arm motor 31 for blowing air is controlled. Since the quick-freezing fan motor 32 is continuously energized for a certain period of time, the amount of cold air discharged to the freezing chamber 7 is doubled, and the reheating time of objects to be cooled in the quick-freezing chamber 7 can be significantly shortened. This reduces the destruction of cells in meat, etc. during freezing, and allows food to be freshly frozen. In addition, the temperature of the refrigerator compartment 8 is detected during the quick freezing operation, and if the temperature of the refrigerator compartment 8 reaches a low temperature of around 0°C, the fan motor 31 for blowing air is stopped.
Prevents food from freezing due to overcooling.

Effects of the Invention As described above, the present invention provides a quick-freezing fan motor exclusively for the quick-freezing type, and increases the rotation speed to maximize the output of the compressor during sudden freezing. In addition to operating both of the freezing fan motors to increase the air volume to improve quick freezing performance, the temperature in the refrigerator compartment is detected during quick freezing operation, and if the temperature in the refrigerator compartment falls below the freezing point of 0°C, The fan motor for blowing air is stopped to stop the air blowing to the refrigerator compartment, thereby preventing the refrigerator compartment from freezing.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts of the refrigerator-freezer of the present invention, FIG. 2 is a central sectional view of the refrigerator-freezer of the present invention, FIG. 3 is a cooling system diagram equivalent to FIG. 6 is a characteristic diagram of cold air discharge air speed and freezing time, FIG. 6 is a timing chart of the refrigerator-freezer of the present invention during operation under high load, and FIG. 7 is an electrical wiring diagram of the corresponding main parts. Fig. 6 is a timing chart at low load equivalent to Fig. 6, Fig. 8 is a central sectional view of a conventional refrigerator-freezer, Fig. 9 is a cooling system diagram equivalent to Fig. 8, Fig. 10 is a cooling system diagram equivalent to Fig. 8, Figure 11 is the 8th
FIG. 12 is an electrical wiring diagram of the main parts corresponding to the figure, and FIG. 12 is a timing chart during operation of a conventional refrigerator-freezer. 18...Quick freezing chamber, 31...Fan motor for blowing air, 32...Fan motor for quick freezing,
37...Rotation speed control circuit, 38...Compressor, 39...Quick freeze switch, 4o...
・Quick freeze timer, 41... switch. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
@tll-°° Freezing room 35...A view, 4F grill 1θ...Rosaiko 3d-On 4 deke 3rd cA
31-LIL7yH-Evening Figure 5 Cold air ℃ rising shield (Speed (''/S) common to Figure 6)! Figure 7 Figure 8 Figure 9 Figure 1.9 Figure 10

Claims (1)

[Claims] A refrigerator truck, a refrigerator compartment, a fan motor for blowing air to circulate cold air between the two compartments, a fan motor for quick freezing, a variable capacity compressor, and a cold air discharge front of the fan motor for quick freezing. a quick-freezing chamber disposed in the rapid-freezing chamber; a quick-freezing switch that provides a signal to continuously energize the quick-freezing fan motor and the compressor for a predetermined time; A refrigerator-freezer equipped with a control circuit that controls the output of the refrigerator to a maximum output, and a temperature sensor that detects the temperature of the refrigerator compartment and controls the operation of a fan motor for blowing air.