JPS6091170A - Rapid refrigeration controller for 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 the Invention The present invention relates to a rapid freezing device in which a direct cooling type auxiliary cooler is provided in a part of a freezer compartment used in a forced draft type refrigerator-freezer or the like.

The structure of the conventional example and its problems The conventional example will be explained with reference to FIGS. 1 and 2. Reference numeral 1 denotes a main cooler 4 housed in a cooling chamber 3 constructed within a partition wall 2, and the refrigerator is a forced draft type refrigerator in which cooled air is circulated through a freezer compartment 6 and a refrigerator compartment 7 using a blower 5. 6 is located separately in the freezer compartment 6.
This is a quick freezing room equipped with a direct cooling type auxiliary cooler 8, which allows food to be frozen quickly. A damper/thermostator 14 is provided at the inlet 1 of the refrigerator compartment 7 to adjust the cold air inflow chamber. As shown in Fig. 2, the freezing cycle is as follows: compressor 9 → condenser 10 → first capillary tube 11 →
A normal flow path that circulates from the main cooler 4 to the compressor 9, and a rapid freezing flow path that circulates from the compressor 9 to the condenser 10 to the second capillary tube 12 to the auxiliary cooler 8 to the main cooler 4 to the compressor 9. A flow path control device 13 (hereinafter referred to as flow path switching valve 13) is provided to switch between the flow paths and the flow path, and rapid freezing is performed by operating the flow path with this switching valve 13. During this rapid freezing, the compressor 9 is forced to operate continuously, but the blower 5 is operated by the main cooler 4.
In order to reduce the heat exchange at The blower is continuously operated at predetermined intervals for a fixed or undefined period of time. In addition, in order to protect the refrigerator compartment 7 from overcooling, if the refrigerator compartment γ falls below the set temperature during quick freezing, the quick freezing is interrupted and the compressor 9 is kept at the internal temperature (for example, the temperature of the freezer compartment 6). ○N10FF normal operation is carried out, and then when the temperature of the refrigerator compartment 7 reaches or exceeds the set temperature, a means is taken to return to quick freezing.

However, when quick freezing is interrupted and resumed in this way, the blower 5 remains stopped until it returns from the interrupted state, and especially when the blower 5 is interrupted immediately after it has stopped, it takes a very long time. The E state continues for a while. Therefore, after recovery, low-temperature cold air is not forced into the freezer compartment 6 and refrigerator compartment 7 immediately, causing the temperature inside the refrigerator to rise. Especially when the doors are opened and closed frequently, the temperature rises at an accelerating rate, causing storage in the refrigerator. It may have an adverse effect on the food inside. In addition, if the blower 5 is interrupted immediately after operation, after returning to normal operation, low-temperature cold air is forced into the freezer compartment 6 and refrigerator compartment Y, causing the internal temperature to drop again and the temperature in the refrigerator compartment 7 to drop below the set temperature, causing rapid freezing again. There was a drawback that the freezing speed of the food that came into contact with the auxiliary cooler 8 was slowed down.

OBJECTS OF THE INVENTION In view of the above points, it is an object of the present invention to eliminate the problem caused by the timing of return of the overheat protection operation, and to prevent temperature rises in the freezing and refrigerating compartments during quick freezing.

Structure of the Invention In order to achieve this object, the present invention periodically or irregularly operates a cold air blower intermittently for a fixed or undefined period of time during quick freezing, and prevents the cold storage room temperature from dropping excessively. If quick freezing is interrupted, the intermittent operation of the blower control device will continue when normal operation resumes, and after quick freezing is restored, the blower will resume operation with the output state of the blower control device to provide an appropriate amount of cold air. is sent to the freezer and refrigerator compartments to prevent temperature rises and drops within the warehouse.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. Incidentally, the same parts as those in the prior art are denoted by the same reference numerals, and the description thereof will be omitted. In the figure, compression 839 is relay 15
The blower 5 is connected to the power supply via the relay 16.
After being connected in series with the compressor 9, it is connected in parallel with the compressor 9. The flow path switching valve 13 is connected in series with the relay 17 and then in parallel with the power source. The flow path switching valve 13 is configured to switch to the normal flow path when the coil is conductive, and to switch to the quick freezing flow path when the coil is not conductive. Here, the relay 16 is configured to close its contacts when the excitation coil is energized, and the relays 16 and 17 are configured to close their contacts when the excitation coil is not energized. Next, a control device for driving these relays will be described.

Reference numeral 18 denotes a temperature control device, which is comprised of a thermistor 19 provided in a part of the freezing chamber, resistors R1, R2, R3, and a comparator 20.

The output of the comparator 20 is configured to send, via an OR circuit 21, a signal to the relay 16 by a driver circuit (not shown) such as a transistor.

Reference numeral 22 constitutes a quick freezing switch, and 23 constitutes a blower control device 24 for emergency time 1'. , quench timer 2
3 outputs a short high signal (hereinafter simply referred to as "H") to the a output after turning on the quick freezing switch 22,
During quick freezing, for example, output a "H# signal" for 90 minutes, output "H" signal for a time t1, and then output a "H" signal for a time t2, followed by a "L" signal for a time t2.
It is configured to alternately output an OW signal (hereinafter simply referred to as L#). The b output of the quenching timer 23 is connected via an AND circuit 26 to the input of an OR circuit 210 and to send a signal to turn the relay 17 ON/OFF. It's a moat, the C output of the quenching timer 23 is AND circuit 2.
6 through the driver circuit, relay 16 is connected to ○N.
It is connected to 10FF. Furthermore, 2γ is a thermistor 28 installed in a part of the temperature control device chamber 7, and a resistance R
4, R5, R6, and a comparator 29.

The output of comparator 29 is connected to the input of AND circuit 25.26.

Next, the operational status of this configuration will be explained.

Normally, when the internal temperature of the refrigerator (freezer compartment temperature) is higher than a predetermined value, the resistance value RTH1 of the thermistor 19 becomes small, and the potential at point A determined by RTH and R1 of the temperature control device 18 increases. , becomes higher than the potential at point B determined by resistors R2 and R3, and the output of the comparator 20 becomes H'', so the output of the OR circuit 21 also becomes H'', and the relay 15 connects a driver circuit such as a transistor (not shown). via O
N L, compressor 9 operates. At this time, since the quick freezing switch 22 is in the OFF state, the quick cooling timer 23 is activated.

The C output is aL#, the output of the AND circuit 25 and 26 is also L'', the relay 16 is ON, the blower 5 is operated, and the relay 17 is also ON at the same time, and the suction of the flow path switching valve 13 is When the coil is energized, the refrigerant circuit is, for example, compressor 9→
Condenser 10 → first capillary 11 → main cooler 4 → compressor 9
A circulation cycle is configured to perform cooling. After that, when the inside of the refrigerator is cooled to a certain temperature, the resistance value R of the thermistor 19
T) φ increases and the A potential becomes smaller than the B potential, so the output of the comparator 20 becomes 'L', and the L' signal from the b output of the quenching timer 23 causes the AND circuit 2
When the output of the compressor 9.5 becomes L#, the output of the OR circuit 21 also becomes L#, and therefore the relay 15 is turned off. The blower 5 stops. Thereafter, this action is repeated to perform the normal cooling action.

Also, during this normal cooling operation, since the internal temperature of the refrigerator compartment is higher than the predetermined temperature, the resistance value RTH2 of the thermistor 28
RTH2 and R4 of the temperature control device 27 become smaller.
The potential at point 0, determined by
is a Hn, and “H” is input to the input of AND circuit 26.26.
"It's sending a signal.

Next, the rapid freezing operation will be explained. When the rapid freezing switch 22 is arbitrarily turned on, output b of the rapid cooling timer 23 continues to generate an "H" signal during the rapid cooling time T, so the inputs of the AND circuit 25 both become Hn, and the output becomes 'H'.
”, one input of the OR circuit 21 becomes Hn, and the output of the OR circuit 21 becomes Hn regardless of the output of the temperature control device 18.
As a result, the relay 15 is turned on, and the compressor 9 is immediately operated. At the same time, the relay 17 is set to 0FFj, the flow path switching valve 13 is de-energized, the flow path is switched to the quick freezing flow path, and the auxiliary cooler 8 starts its cooling action. On the other hand, quench timer 230
The C output generates Hn for time t1 after the start of rapid freezing, then it is "1." for time t2, '1 kMU
tl no N'l 'H'', t2 +t L
I+ and repeat this until the quick freezing is completed.

As a result, the blower 6 is turned FF at t1, then turned ON for 12 hours.
This results in intermittent operation of N. During such quick freezing, if the temperature inside the refrigerator after refrigeration is lower than the predetermined temperature, the thermistor 28
The resistance value RTH2 of the temperature control device 27 increases.
The potential at the 0 point determined by H2 and R4 is
9 comparator 29 which is p lower than the potential of point D determined by
The output d of becomes L'', and an L'' signal is sent to the input of AND circuits 25 and 26. As a result, AND circuit 25.26
output becomes "L", and one input of the OR circuit 21 becomes "L".
7+, the output of the OR circuit 21 is determined by the output of the controller 20 of the temperature control device 18, and at the same time, the output of the OR circuit 21 is
is ON and becomes normal operation. Further, the relay 16 is also turned ON, and the blower 5 is also connected in parallel with the compressor 9, resulting in normal operation. In this way, even if quick freezing is interrupted, the quick cooling timer 23
The outputs S and C continue to generate the quenching time T and H'''a Ln signals. Then, when the internal temperature of the refrigerator compartment 7 becomes higher than the predetermined temperature, the output d of the comparator 29 becomes "H".
This is input to the AND circuits 25 and 26, and the rapid cooling is returned to the rapid freezing state with the signals output from the rapid cooling timer 23 (s) and (c). Example 1 shown in FIG. 4 is a case where the quick freezing operation is interrupted immediately after the blower 5 is turned off, and Example 2 is a case where the quick freezing operation is interrupted immediately after the blower 5 is turned on. The C output continues to generate "H" and "L" signals, and the blower 5 continues to operate in the C output state even after quick freezing returns, so the refrigerator compartment 6. By sending an appropriate amount of cold air into the freezer compartment Y, it is possible to better control the rise and fall of the temperature inside the freezer.

Effects of the Invention As is clear from the above-described configuration, the present invention provides a quick freezing chamber equipped with a direct cooling type auxiliary cooler in the freezer compartment of a forced draft type refrigerator-freezer, and only the main cooler is used during normal cooling. During rapid cooling, the flow path control device switches the refrigerant so that it flows through the main cooler and the auxiliary cooler, and during rapid cooling, the blower is switched on periodically or irregularly for a fixed or undefined period of time. The blower control device continues operating the refrigerator, interrupts quick freezing when the temperature in the refrigerator compartment falls below a predetermined temperature, resumes it when the temperature in the refrigerator compartment reaches a predetermined temperature, and maintains normal operation while the quick freezing is interrupted. The intermittent operation continues, and quick freezing recovery is configured to control the blower in the intermittent operation state of the blower control device.If the blower is interrupted immediately after stopping, as in the conventional example, after recovery, the freezing room, Because low-temperature cold air is not forced into the refrigerator, the temperature inside the refrigerator increases. Especially when the door is opened and closed frequently, the temperature rises at an accelerated rate and does not adversely affect the food stored in the refrigerator.

In addition, even if the blower is interrupted immediately after operation, after it is restored, low-temperature cold air is forced into the freezer and refrigerator compartments, causing the internal temperature to drop and the refrigerator compartment to drop below the set temperature, causing quick freezing to resume in November. , the freezing speed of food that comes into contact with the auxiliary cooler does not slow down, and the appropriate amount of cold air is always sent to the freezer and refrigerator compartments even after returning from quick freezing, preventing temperature rises and drops within the refrigerator. The practical effects such as being able to prevent this and achieve good freezing are extremely high.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional refrigerator, Fig. 2 is a diagram of its freezing cycle piping, and Fig. 3 is an embodiment of the present invention.
Fi! I control circuit diagram, FIG. 4 is an operation explanatory diagram showing the operation status of the blower control device. 3...Cooling room, 4...Main cooler, 5- Blower, 8. Auxiliary cooler, 6'... Rapid freezing room, 9
・Compressor, 13 Flow path control device, 22... Rapid freezing switch, 24 Blower control device, 27 ・Temperature detector. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure l/

Claims (1)

[Scope of Claims] A blower that circulates air cooled by a main cooler provided in a cooling chamber to a freezing chamber and a refrigerator; a quick freezing chamber through which air cooled by the main cooler passes through the freezing chamber; A direct cooling type auxiliary cooler disposed in the quick freezing chamber, a flow path control device that controls whether the refrigerant flows only to the main cooler or to both the main cooler and the auxiliary cooler, and a refrigeration cycle. A quick freezing switch that performs quick freezing by continuously operating the compressor to continuously flow refrigerant to the auxiliary cooler, and operating the blower periodically or irregularly for a fixed or irregular time during the quick freezing. , during other times, there is a blower control device that stops the blower, a temperature sensor that detects the temperature inside the refrigerator compartment, and a temperature sensor that interrupts the quick freezing when the temperature sensor outputs a temperature below a set temperature during quick freezing. Only the compressor is operated in a normal 0N10FF operation at the temperature inside the refrigerator, and the operation of the blower control device is continued. A quick freezing control device for a refrigerator that causes the compressor to operate continuously when the temperature sensor outputs a temperature equal to or higher than a set temperature and returns to quick freezing.