JPS61191853A - 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 the function of frozen cold resin and rapid freezing of home fried ink and the like.

An example of the above-mentioned conventional refrigerator-freezer will be described below with reference to FIGS. 6 to 9.

FIG. 6 is a central sectional view of a conventional refrigerator-freezer, and FIG. 6 is a diagram of a cooling system of the conventional refrigerator-freezer.

Reference numeral 1 denotes a refrigerator-freezer consisting of a main body 2, upper and lower doors 3, 4, and a machine room 6. A partition wall 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 cold and strict room 8 is formed. A cooling chamber 10 is formed on the back surface of the freezing chamber 7 by a back plate 9, and a blower fan motor 11 and an evaporator 12 are installed vertically within the cooling chamber 10. A fan ring 13 is installed around the blade 11' of the blower motor 11, and a discharge grill 14 is installed in front of the fan ring 13.
A bottom plate 15° and a side plate 16 are provided in front of the discharge grille 14.
A quick-freezing chamber 18 is provided, which is formed by a front door 17 having a hole 17' in the upper part. The discharge grille 14 is provided with openings 14a, 14b, and 14c.
cFs, opening towards the freezing chamber 18.

Further, near the right end of the fan ring 13, a duct guide 19 for blowing cold air to the refrigerator compartment 8 is provided. A suction port 20 and a suction port 21 are installed near the door A and K of the partition wall 6, respectively, and the suction ports 20 and 21 communicate with the cooling chamber 10, respectively.

A thermostat 22 for detecting the temperature inside the refrigerator is provided in front of the opening 14a.

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 a damper thermostat 24 to adjust the amount of cold air discharged into the refrigerator compartment 8.

The discharge port 23 is connected to the duct guide 1 via the duct 26.
It is connected to 9.

Next, the cooling system will be explained using FIG. 7. 2
Reference numeral 6 denotes a variable rotation speed type compressor with a piston (not shown), and the cooled fluorocarbon gas etc. compressed by the compressor 26 is passed through a condenser 27. A circuit is formed in which the gas passes through the capillary tube 28, is vaporized in the evaporator 12, and returns to the compressor 26.

Next, the operation control circuit will be explained using FIG. The blower fan motor 11 is connected to a power source via a thermostat 22. In addition, the variable capacity compressor 26 is
The piston rotation speed is controlled by the rotation speed control circuit 29 so that the output is controlled according to the load amount of the refrigerator-freezer.

The rotation speed control circuit 29 is wired in series with the compressor 26 and in series with the thermostat 22. Further, 30 is a quick freeze switch, and the switch is set to be ON for a certain period of time by a timer 3σ. The quick freeze switch 3o is connected to the blower fan motor 11 so as to bypass the thermostat 22. In addition, the compressor 26 of the variable capacity panel is also connected to the quick freeze switch 30, and only when the quick freeze switch 30 is turned on, the maximum output and maximum rotation speed are achieved regardless of the freezer compartment temperature or load amount. The rotational speed control circuit 29 commands the same.

The operation of the conventional refrigerator-freezer configured as described above will be explained using the timing chart shown in FIG. 9.

When the quick freeze switch 30 is OFF, the temperature of the freezer compartment 7 is detected by a temperature sensing element (not shown), and the compressor 26. Air blower 7
7 to control the motor 11 and turn the cooling system to 0N.
-OFF control. Then, the difference between the set temperature of the freezer compartment 7 and the indoor temperature of the freezer compartment 7 is detected, and if the cooling load becomes large, the piston of the compressor 26 is operated at a high rotation speed to ensure high refrigeration output and quickly. Control is performed to return the temperature of the freezer compartment 7 to the set temperature.

In other words, the temperature in the freezer compartment is below the set temperature (-18℃).
At the point in time, the thermostat 22 is OFF L, and the compressor 26. Since the air blower motor 11 is turned off, cooling inside the refrigerator is stopped, and the temperature in each chamber 7 and 8 increases. Then, at time t2 when the temperature exceeds the set temperature (-18 DEG C.), the thermostat 22 is turned ON and the compressor 26 and the blower fan motor 11 are turned ON again, thereby cooling each chamber 7, 8 and lowering the temperature. 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 30 is turned on will be explained. This quick freeze switch 30 is used when home freezing food, but the quick freeze switch 3o is turned off.
If N (time point 14), the timer 3σ is energized and the compressor 26. The blower 71 motor 11 is turned on. At this time, since the quick freeze switch 30 is connected to bypass the thermostat 22, the compressor 26. The blower fan motor 11 is continuously operated for a predetermined period of time according to the timer 30', and the compressor 26 is operated at maximum rotation so that the compressor 26 has the maximum output. Therefore, the amount of refrigerant circulated per hour in the cooling system increases approximately in proportion to the number of rotations of the piston. In addition, since the piston is operated at maximum rotation, the pressure in the evaporator 12, which is on the low pressure side, is lower than when the rotation speed is normal, so the evaporation temperature of the refrigerant in the evaporator 12 becomes lower.

Therefore, the temperature of the discharged cold air also decreases. For this reason, the quick freezing chamber 1
Since the temperature of the cold air that hits the food to be frozen placed in the container 8 becomes lower, the time required for freezing can be shortened, and the food can be frozen and preserved with better quality.

Then, at time t6 after a certain period of time has elapsed, the temperatures in the freezing compartment 7 and quick-freezing compartment 18 drop to around -30°C, and the temperature in the refrigerator compartment 8 drops to around 0°C, and timer 3σ causes the compressor 26.
The blower fan motor 11 is turned off and cooling is stopped.

Therefore, the temperature of each chamber 7, 8.18 increases from time t6, and at time t6 when the temperature of the freezer compartment 7 slightly exceeds the set temperature (-18°C), the thermostat 22 is turned on.
Compressor 26 again. Turn on the blower fan motor 11.
Start cooling operation. After that, the thermostat 22 turns 0N-
OFF The temperature of each chamber 7.8 is maintained at the set temperature.

Problems to be Solved by the Invention However, in the above configuration, only the compressor has high output during quick freezing operation, and the other capillary tubes, evaporator, and condenser have the same capacity as during normal operation. Because of this, even if the compressor O piston rotation speed was increased, it was not possible to secure an effect commensurate with the increase in rotation speed, and the reduction in freezing time was small compared to the increase in input. .

For this reason, as freezing progresses, cells in meat, fish, etc. are destroyed,
There was a problem in that good freezing was not possible and the quality of the frozen food deteriorated.

In view of the above-mentioned problems, the present invention is intended to significantly shorten the time required for freezing and maintain high quality frozen freshness of foods.

Means for Solving the Problems In order to solve the above problems, the refrigerator-freezer of the present invention is equipped with a variable capacity compressor and a variable flow resistance throttling device for the refrigerant in the cooling system. During the quick freezing operation mode, the output of the variable capacity compressor is maximized, and initially, the flow path resistance of the throttling device is reduced and the amount of refrigerant circulated in the cooling system is greatly increased to increase the refrigeration capacity. In the final stage, the flow path resistance of the throttle device is increased and the refrigerant evaporation temperature in the evaporator is controlled to be lowered.

Effects of the present invention With the above-described configuration, the maximum refrigerating capacity is ensured at the beginning of the quick freezing operation, and at the end of the quick freezing operation, the temperature of the discharged cold air is lowered to a sufficiently low temperature even to the inside of the object to be cooled. This makes it possible to significantly shorten the time required for freezing.

This prevents the cells of meat and fish from being destroyed by freezing, making it possible to produce extremely fresh, high-quality frozen foods.

EXAMPLE A refrigerator-freezer according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 4. Incidentally, the same components as those in the prior art are given the same numbers, detailed explanation thereof will be omitted, and only the different points will be explained.

31.32 is the first capillary tube of the cooling system;
The second capillary tube includes a condenser 27 and an evaporator 1.
20 are connected in parallel. Further, a solenoid valve 3 is installed downstream of the second capillary tube 32 (on the evaporator 12 side).
3 is installed.

Next, the electric circuit will be explained.

34 is an on/off switch for the solenoid valve 33, and the quick freeze switch 30 [is energized in conjunction with the switch]. The on/off switch 30 opens the solenoid valve 33 according to the timer 34'. Then, after a certain period of time has elapsed by the timer 34', the open/close switch 3o
is OFF L, and the solenoid valve 33 is closed. Therefore, immediately after the start of quick freezing operation, the refrigerant condensed in the condenser 27 flows from both the first and second capillary tubes 31 and 32 to the evaporator 12.
evaporates. After a certain period of time has elapsed, the solenoid valve 33 closes, and the refrigerant passes through the first capillary tube 31 and enters the evaporator 12.

Next, referring to FIG. 4, operations during operation will be explained using a timing chart.

When the quick freeze switch 3o is OFF, the solenoid valve 33 is closed, and the refrigerant leaving the condenser 27 passes through the first capillary tube 31 and evaporates in the evaporator 12. This first capillary tube 31 has approximately the same flow path resistance 69 as the conventional capillary tube 28, and is controlled in the same way as the conventional one (to'-t4').

Next, if you turn on the quick freeze switch 30 (at time t4'),
The on/off switch 34 is turned on, and the solenoid valve 33 is opened.

On the other hand, the compressor 26. The blower fan motor 11 is continuously energized regardless of the thermostat 22. At this time, in order to maximize the output of the compressor 26, the piston (not shown) rotates at the maximum number.

Furthermore, since the solenoid valve 33 is opened, the refrigerant that has exited the condenser 27 is transferred to the first and second capillary tubes 31.3.
2, flows into the evaporator 12 and is evaporated. Said 1st.
2nd capillary tube 31.320 flow path resistance value R4
, R2, the resistance value R at this time is parallel connection.
is expressed as R<R1. Therefore, the flow resistance decreases,
It is possible to ensure the amount of refrigerant circulation that corresponds to the increase in piston rotation speed. Since the refrigerating capacity of the compressor is directly proportional to the amount of refrigerant circulated, the refrigerating output is greatly improved.

Then, after a certain period of time has elapsed, the timer 34' turns off the open/close switch 34, and the solenoid valve 33 closes (t6
’). At this time, the refrigerant flows only on the first capillary tube 31 side. Therefore, 70' from t'
During this period, the resistance value increases.

On the other hand, the piston of the compressor 26 remains at the maximum rotation speed,
The high pressure side (condenser side) of the cooling system has a higher pressure and the low pressure side (evaporator side) has a lower pressure. Therefore evaporator 1
The temperature of 2 is from t6' to t6' as well as from t' to t6'.
' The temperature of the cold air discharged into the freezing chamber 18 naturally decreases.

Therefore, the degree of temperature drop of the object to be cooled in the freezing chamber 18 is t
It becomes sharper between t6' and t6' than from ' to t'. Therefore, the temperature of the object to be cooled in the freezing chamber 18 does not become saturated over time, and the object is cooled to a lower temperature, so that the time required for freezing can be shortened. or,
Since the temperature difference between the discharged cold air and the object to be cooled can be large, the object to be cooled can be cooled to the deep part.

As described above, according to this embodiment, the quick freeze switch 30 is turned on.
Then, by controlling the piston rotation speed of the compressor 26 to the maximum and by reducing the flow path resistance value of the capillary tube of the cooling system at the beginning of the rapid freezing operation, a sufficient amount of refrigerant circulation can be ensured. Then, by securing the refrigerating capacity commensurate with the increase in the rotational speed of the compressor 26, and after a certain period of time has elapsed, by reducing the flow path resistance of the capillary tube, the temperature of the discharged cold air is lowered, and the temperature of the object to be cooled is saturated. Since the temperature can be lowered without any problem, the time required for freezing can be shortened. Therefore, destruction of cells of meat etc. during freezing can be reduced, and foods can be frozen while still fresh. In addition, since the freezing time can be shortened, the amount of cold air sent to the refrigerator compartment 8 during this period can also be reduced, and the amount of cold air sent to the refrigerator compartment 8 can be reduced.
Can prevent food from freezing inside.

Effects of the Invention As described above, the present invention uses a variable capacity compressor and, in the first half immediately after the start of freezing operation, reduces the flow path resistance of the throttling device of the cooling system to ensure the amount of refrigerant circulating through the cooling system. By doing so, the increased output of the compressor is effectively used to cool the object to be cooled, and in the latter half of the rapid freezing operation, the flow path resistance is reduced and the evaporation temperature of the refrigerant in the evaporator is further lowered. Lowering the discharge cold air temperature.

Due to this effect, at the beginning of freezing, the temperature of the object to be cooled is high, so the discharged cold air does not need to be at a sufficiently low temperature, and the evaporation temperature of the refrigerant is raised, the amount of refrigerant circulation is increased, and the refrigerating capacity is secured. However, even if there is an object to be cooled,
When the temperature difference from the discharged cold air temperature becomes smaller, the flow path resistance increases and the evaporation temperature becomes lower, that is, the discharged cold air temperature becomes lower, so the temperature of the object to be cooled decreases without becoming saturated. .

Therefore, the time required for freezing can be shortened, and higher quality frozen foods can be obtained. Furthermore, by shortening the time in this manner, the amount of cold air sent to the refrigerator compartment side is also reduced, so that freezing of the refrigerator compartment due to quick freezing operation can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the cooling system of the refrigerator-freezer of the present invention, Fig. 2 is a central sectional view of the refrigerator-freezer of the invention, Fig. 3 is an electrical wiring diagram of the main parts corresponding to Fig. 2, and Fig. 4 is a timing chart during operation of the refrigerator-freezer of the present invention, FIG. 6 is a central sectional view of a conventional refrigerator-freezer, FIG. 6 is a perspective view showing the main parts of FIG. 6, and FIG. 7 is a diagram equivalent to FIG. 6. Cooling system diagram, Figure 8 is 6
9 is an electric circuit diagram corresponding to the figure, and FIG. 9 is a timing chart during operation of a conventional refrigerator-freezer. 11...Blower fan motor, 18...
Quick freezing chamber, 26... Compressor, 30... Quick freezing switch, 31... First capillary tube, 32... Second capillary tube. , 33...
... Solenoid valve, 34 ... Open/close switch.
゛Name of agent Patent attorney Toshio Nakao and 1 other person No. 1
Figure 1f --- 11 凰ふ 1 しょう 26...qi醗挾, 73... Hongmen dialect Fig. 2
,,... Sakae fan(-ril)
/... Fish, N East Room 26... Engineering, compressor 21...・Sochi Figure 4 Orchid Figure 5 Figure 6 Figure 8 Figure 22?9

Claims (1)

[Claims] A variable-capacity compressor, a quick-freeze chamber provided in front of the cold air discharge of a blower fan motor that circulates cold air, and a quick-freeze operation mode that provides a signal to continuously energize the blower fan motor and the compressor for a predetermined period of time. The control circuit is configured to set the output of the compressor to the maximum output in the quick freezing operation mode, and to reduce the flow path resistance of the throttling device of the cooling system in the first half immediately after the start of the quick freezing operation. The second half is a refrigerator-freezer that is controlled to increase the flow path resistance of the throttle device.