JPH0235918B2 - REIZOKONOKYUSOKUREITOSOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rapid freezing device in which an auxiliary cooler is provided in a part of a freezer compartment of a forced draft type refrigerator-freezer or the like.

Structure of the conventional example and its problems The conventional example is shown in FIGS. 3 and 4. 1 is insulation wall 2
The air cooled by the main cooler 4 stored in the cooling chamber 3 constructed between the
This is a forced draft refrigerator that circulates the air. Reference numeral 8 denotes a quick-freezing chamber which is provided with an auxiliary cooler 9 of a direct cooling type separately within the freezing chamber 6, and is used to quickly freeze food. A damper thermostat 10 is provided at the entrance of the refrigerator compartment 7 to adjust the amount of cooling inflow. As shown in FIG. 4, the refrigeration cycle includes a normal flow path that circulates from compressor 11 → condenser 12 → first capillary tube 13 → main cooler 4 → compressor 11,
Compressor 11 → condenser 12 → second capillary tube 14 → auxiliary cooler 9 → main cooler 4 → flow path control device 15 that switches to compressor 11 and a circulating rapid freezing flow path
(hereinafter referred to as a switching valve 15) is provided, and rapid freezing is performed by operating the switching valve 15 to switch the flow path. During this rapid freezing, the compressor 11 is forced to operate continuously, but the blower 5 is operated by the main cooler 4.
In order to reduce the amount of heat exchange in the auxiliary cooler 9, maintain the evaporation temperature of the auxiliary cooler 9 at a low temperature, and speed up the freezing speed of the food that comes into contact with the auxiliary cooler 9, measures are taken to stop the operation during quick freezing. ing. However, when the blower 5 for forced ventilation during rapid freezing is stopped in this way, the effect of sublimating the frost on the auxiliary cooler 9 with the cold air sent by the blower 5 disappears, and the frost on the surface of the auxiliary cooler 9 disappears. The blower 5 was operated intermittently during rapid freezing because it lowered the thermal conductivity to the food and slowed down the freezing speed of the food. However, at this time, the operation rate of the blower 5 is set to a high level assuming that a large amount of frost will form on the surface of the auxiliary cooler 9, such as when rapid freezing operations are performed continuously. In the case of only quick freezing, the blower 5 is operated intermittently at a predetermined operating rate even though there is not much frost on the auxiliary cooler 9, causing the evaporation temperature of the auxiliary cooler 9 to rise unnecessarily and freezing the food. It had the disadvantage of slowing down the speed.

OBJECT OF THE INVENTION In view of the above points, the present invention aims to prevent unnecessary temperature rise of the auxiliary cooler during rapid freezing.

Structure of the Invention In order to achieve this object, the present invention sets the operation rate of the blower according to the number of quick freezing operations and causes the blower to operate intermittently, thereby sublimating the frost on the surface of the auxiliary cooler during quick freezing, and This prevents unnecessary temperature rise in the auxiliary cooler.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Note that the cross section and refrigerant circuit of the refrigerator are the same as in the conventional example, so in the explanation of this example, reference will also be made to FIGS. 3 and 4, and the same parts as in the conventional example will be the same. The detailed explanation will be omitted.

In the figure, the compressor 11 is connected to a power source via a relay 16, the blower 5 is connected in series with a relay 17, and the switching valve 15 is connected in series with a relay 18, and both are connected in parallel with the compressor 11. It is connected. The switching valve 15 is configured to switch to the normal flow path when the coil is not energized and to the quick freezing flow path when the coil is energized. Relays 16, 17, and 18 are configured to close their contacts when the excitation coil is energized. 1
Reference numeral 9 denotes a temperature control device, which is comprised of a thermistor 20, resistors R ₁ , R ₂ , R ₃ , and a comparator 21 provided in a part of the freezer compartment 6 . The output of the comparator 21 is transmitted through an OR circuit 22 to turn on/off the relay 16 by a driver circuit (not shown) such as a transistor.
It is configured to send a signal to turn off. 23
is a quick freezing switch, and 24 is a quick cooling timer. When the quick freezing switch 23 is turned on, the quick cooling time timer 24 inputs a short high level signal (hereinafter simply referred to as "H" signal) to the a input as shown in FIG. 1, and the b output indicates that the quick freezing is in progress. T Outputs an "H" signal _{for 1} hour (for example, 90 minutes), and outputs a "H" signal at the first "H" signal input to the a input to the c output. T ₂ hours "L" signal 3T ₂ hours ratio When the second "H" signal is input to the a input within a predetermined time after the first rapid freezing is completed,
“H” signal 2T ₂ hours “L” signal 2T ₂ hours output, and a
When there is a third input to the input, the "H" signal 3T for ₂ hours and the "L" signal T for ₂ hours, so that a The more times the "H" signal enters the input, the higher the ratio of "H" signal output becomes.
The c output is configured to output an "H" signal when the output is an "L" signal. And quench timer 24
The output b sends a signal to turn ON/OFF the relay 18 and is connected to the input of the OR circuit 22. Also, the c output is connected to send a signal to turn the relay 17 ON/OFF.

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 R _TH of the thermistor 20 becomes small, and the temperature at point A determined by R _TH and R ₁ of the temperature control device 19 decreases. The potential becomes higher than the potential at point B determined by resistors R ₂ and R ₃ and the comparator 21
Since the output of the OR circuit 22 becomes "H", the output of the OR circuit 22 also becomes "H", the relay 16 is turned on via a driver circuit (not shown) such as a transistor, and the compressor 11 is operated. At this time, quick freeze switch 23
is in the OFF state, so b of the rapid cooling timer 24
The output is "L", the relay 18 is OFF, the suction coil of the switching valve 15 is not energized, and the refrigerant circuit is from the compressor 11 to the condenser 12 to the first capillary tube 13.
A circulation cycle of →main cooler 4 →compressor 11 is configured to perform cooling. Also, since the c output of the quenching timer 24 is "H", the relay 17 is energized to close the contact and the blower 5 is energized. After that, if the inside of the refrigerator is cooled to a certain temperature, the resistance value of the thermistor 20 R _TH
increases and the A potential becomes smaller than the B potential, so the output of the comparator 21 becomes "L", and together with the "L" signal from the b output of the quenching timer 24, the output of the OR circuit 22 also goes to the "L" level. Then, the relay 16 turns OFF and the compressor 11 and blower 5 stop. Thereafter, this action is repeated to perform a normal cooling action.

Next, the rapid freezing operation will be explained. If you turn on the quick freezing switch 23 at your discretion, the quick cooling timer 24 will start.
Since the b output of continues to generate an "H" signal during the quenching time _T1 , one input of the OR circuit 22 is "H".
Therefore, regardless of the output of the temperature control device 19, the output of the OR circuit 22 becomes "H" and the relay 16 is turned on.
The compressor 11 is then operated immediately. At the same time, the relay 18 is turned on, the switching valve is energized, the flow is switched to the rapid freezing flow path, and the auxiliary cooler 9 starts its cooling action. When the quick freezing operation is performed for the first time, the “H” signal T is output _{for 2} hours from the c output, so relay 17
is forced to operate like the compressor 11 which continues to be ON, but since the "L" signal is output for 3T ₂ hours after that, the relay 17 is OFF and the blower 5 is stopped. After this, this operation is repeated during the quenching time. 1st
If there is a second quick freezing operation within a predetermined time after the first quick freezing is completed, the output pattern of only the c output is changed, and after the quick freezing switch is turned on, the relay 17 is turned on and the blower 5 is operated for 2T ₂ hours. 2T ₂ hour relay 17 turns OFF and blower 5 stops. From then on, when the quick freezing operation is repeated within a predetermined time after the end of the previous quick freezing, the blower 5
operates intermittently. After the rapid freezing is completed (after T ₁ hour has elapsed), the b output of the rapid cooling timer 24 becomes "L", and since the temperature inside the refrigerator is low, the temperature control device 19
Since the output of the OR circuit 22 is "L", the output of the OR circuit 22 is also "L", which turns off the relay 16 and stops the compressor 11 and blower 5.

Effects of the Invention As is clear from the above configuration, the present invention provides an auxiliary cooler in the freezer compartment of a forced draft type refrigerator-freezer, and separates the refrigerant flow paths of the main cooler and the auxiliary cooler during normal cooling and quick freezing. A flow path control device is installed to switch the
It is configured to increase the operation rate of the blower during quick freezing as the number of quick freezing operations increases.
There is no need to run the blower unnecessarily during the first quick freezing operation when the amount of frost on the auxiliary cooler is small, raising the evaporation temperature of the auxiliary cooler and slowing down the freezing speed of the food. Even if the operation is performed, the operating rate of the blower is increased to improve the sublimation ability, suppressing the amount of frost on the auxiliary cooler, and keeping the surface of the auxiliary cooler in good condition at all times, resulting in a constant rapid freezing effect. It has a great effect on obtaining.

[Brief explanation of drawings]

FIG. 1 is a control circuit diagram showing one embodiment of the present invention;
FIG. 2 is a sectional view of a conventional refrigerator, and FIG. 3 is a refrigeration cycle piping diagram thereof. 3... Cooling room, 4... Main cooler, 5... Blower, 8... Rapid freezing room, 9... Auxiliary cooler, 11
... Compressor, 15 ... Flow path control device, 23 ... Rapid freezing switch, 24 ... Rapid freezing switch.

Claims (1)

[Claims] 1. A blower that circulates the air cooled by the main cooler installed in the cooling room to the freezer and refrigerator compartments, a quick-freezing room through which the air cooled by the main cooler passes through the freezer compartment, and a The disposed auxiliary cooler, a flow path control device that controls the refrigerant flow path of the main cooler and the auxiliary cooler, and a compressor of the refrigeration cycle are continuously operated to continuously flow the refrigerant to the auxiliary cooler. This quick-freezing device for a refrigerator includes a quick-freezing switch that performs quick-freezing, and a blower control device that increases the operating rate of the blower during quick-freezing when quick-freezing operations are performed continuously.