JPH0120626Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a rapid freezing device that is used in a forced draft type refrigerator-freezer, etc., and includes a direct cooling type auxiliary cooler provided in a part of the freezer compartment.

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 is a forced draft type refrigerator in which cooled air is circulated to a freezing chamber 6 and a refrigerating chamber 7 by a blower 5. Reference numeral 6' denotes a quick-freezing room which is provided with an auxiliary cooler 8 of a direct cooling type separately within the freezer room 6, and allows food to be quickly frozen.

Furthermore, a damper thermostat 14 is provided at the entrance of the refrigerator compartment 7 to adjust the cold air inflow chamber. As shown in Fig. 2, the refrigeration cycle consists of a normal flow path that circulates from compressor 9 to condenser 10 to first capillary tube 11 to main cooler 4 to compressor 9, and to compressor 9.
→ Condenser 10 → Second capillary tube 12 → Auxiliary cooler 8
It is equipped with a flow path control device 13 that switches between →main cooler 4 →compressor 9 and a circulating flow path for quick freezing, and by switching the flow path, a quick freezing effect is performed. During this rapid freezing, the compressor 9 is forced to operate continuously, but the blower 5 reduces the heat exchange capacity of the main cooler 4, maintains the evaporation temperature of the auxiliary cooler 8 at a low temperature, and maintains the evaporation temperature of the auxiliary cooler 8 at a low temperature. In order to speed up the freezing speed of the food that comes into contact with the container 8, means are taken to stop the operation during rapid freezing. However, if the forced air blower 5 is stopped during rapid freezing, the cooling effect of the main cooler 4, which is originally intended to cool the freezer compartment 6 and refrigerator compartment 7, is not utilized, and the rapid freezing is interrupted. Inside, because low-temperature cold air is not forced into the refrigerator compartment 7, the internal temperature rises, and the damper thermostat 1
4 is when the door is fully open and there are many times when the door is opened and closed.
When food is added, warm and humid air flows toward the blower 5 via the damper thermostat. During quick freezing, the blower 5 is stopped and the temperature is low, so the warm moisture easily adheres to the blower fan, the case that holds the blower, or the shaft shaft of the blower. There was a drawback that it was difficult to use.

Purpose of the invention In view of the above points, the purpose of the invention is to prevent the blower from losing its function during rapid freezing.

Structure of the invention In order to achieve this objective, the present invention does not raise the evaporation temperature of the auxiliary cooler during rapid freezing, and continues to operate the blower at an extremely low rotation speed that does not interfere with rapid freezing. This prevents the fan from locking up.

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 in the prior art are given the same reference numerals, and the explanation will be omitted. In the figure, compressor 9 is connected to a power source via relay 15. The flow path control device 13 is connected in series with the relay 17 and then in parallel with the power supply device. This flow path control device 13, when the coil is conductive,
The normal flow path is configured to switch to the rapid freezing flow path when the flow is out of conduction. Note that the relay 15 is configured to close its contacts when the excitation coil is energized, and the relay 17 is configured to close its 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 includes a thermistor 19, resistors R ₁ , R ₂ ,
R ₃ and a comparator 20. The output of the comparator 20 is configured to send a signal to turn on/off the relay 15 via an OR circuit 21 by a driver circuit (not shown) such as a transistor.

Reference numeral 22 is a quick freezing switch, and 23 is a rapid cooling timer, which constitutes a blower control device 24. After the quick freezing switch 22 is turned on, the quick cooling timer 23 outputs a short-time High signal (hereinafter simply referred to as "H") to the a output, and a rapid high signal to the b output, as shown in FIG. 3b. It is configured to output an "H" signal for, for example, 90 minutes during freezing, and also output an "H" signal to the c output. And rapid cooling timer 23
b output is the input of OR circuit 21 and relay 17
It is connected to send a signal to turn on/off. Further, the c output of the quenching timer 23 is connected to turn the relay 16 ON/OFF through a driver circuit.

Next, the operational status of this configuration will be explained.
Normally, if the internal temperature of the refrigerator (freezer compartment temperature) is higher than a predetermined value, the resistance value of the thermistor 19
The potential at point A determined by RTH and _R1 is the resistance
Since the potential of point B becomes higher than the potential determined by R ₂ and R ₃ and the output of the comparator 20 becomes "H", the output of the OR circuit 21 also becomes "H", and the relay 15 becomes a driver such as a transistor (not shown). It is turned on via the circuit, and the compressor 9 operates. At this time, the b and c outputs of the quick freezing switch 23 are "L", the relay 16 is in the 16a position and is operating at normal rotation, and the relay 17 is also turned on at the same time, and the flow path switching valve 13 is turned on. The suction coil is energized, and the refrigerant circuit goes from the compressor 9 to the condenser 10 to the first capillary tube 11.
A circulation cycle of →main cooler 4 →compressor 9 is configured to perform cooling. After that, when the inside of the refrigerator is cooled to a certain temperature, the resistance value of the thermistor 19, RTH, increases and the A potential becomes smaller than the B potential, so the output of the comparator 20 becomes "L" and the b output of the quenching timer 23. OR together with the “L” signal from
The output of circuit 21 also becomes "L", so relay 1
5 is turned off, and the compressor 9 and blower 5 are stopped. Thereafter, this action is repeated to perform the normal cooling action.

Next, the quick freezing effect will be explained. If you turn on the quick freezing switch 22 at your discretion, the quick cooling timer 2 will start.
Of the outputs of 3, output b is “H” throughout the quenching time T.
In order to continue generating the signal, one input of the OR circuit 21 becomes "H", the output of the OR circuit 21 becomes "H" regardless of the output of the temperature control device 18, the relay 15 is turned on, and the compressor 9 is turned on. Driven instantly. At the same time, the relay 17 is turned OFF, 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, the c output of the quick cooling timer 23 generates "H" from the start of quick freezing until the end, and the relay 16 switches to 16b, and due to the difference in capacitance (Ca>Cb),
A blower is operated at extremely low speed. Of course, the blower is operated at an extremely low rotation speed so as not to increase the evaporation temperature so as not to impair the effect of quick freezing, and at least a little more cold air is convected towards the inside of the refrigerator than in the past. It can also prevent the temperature inside the refrigerator from rising.

Effects of the device As is clear from the above configuration, the present invention provides a quick freezing chamber with a direct cooling type auxiliary cooler in the freezer compartment of a forced draft type refrigerator. Only during rapid freezing, the rapid cooler uses a flow path control device to switch so that refrigerant flows through both the main cooler and the auxiliary cooler, and only during rapid freezing, the blower is operated at extremely low rotation speed. This configuration has the effect of suppressing the fan lock caused by stopping the blower, and eliminates the risk of the internal temperature rising at an accelerated rate during quick freezing, which deteriorates the quality of the food being stored, as in conventional methods. Extremely high effects can be obtained, such as the elimination of sexual characteristics.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional refrigerator;
The figure is a conventional refrigeration cycle piping diagram, and Figure 3a is
A control circuit diagram of a quick freezing device for a refrigerator according to an embodiment of the present invention, FIG. 3b is a time chart of a quick cooling timer in the control circuit of FIG. 3a, and FIG. 4 is a quick freezing device according to an embodiment of the present invention. 1 is a sectional view of a refrigerator equipped with a refrigerator. 3...Cooling room, 4...Main cooler, 5...Blower, 8...Auxiliary cooler, 6...Quick freezing room, 9...
...Compressor, 13...Flow path control device, 22...Rapid freezing switch, 24...Blower control device.

Claims (1)

[Scope of utility model registration request] A blower that circulates the air cooled by the main cooler provided in the cooling chamber to the freezer and refrigerator compartments, a quick-freezing room through which the air cooled by the main cooler passes through the freezing room, and disposed within the quick-freezing room. A direct cooling type auxiliary cooler, a flow path control device that controls whether the refrigerant flows to only the main cooler or both the main cooler and the auxiliary cooler, and a compressor of the refrigeration cycle are continuously operated. A quick-freezing refrigerator equipped with a quick-freezing switch that performs quick freezing by continuously flowing refrigerant through an auxiliary cooler, and a blower control device that causes the blower to operate at an extremely low rotation speed during the quick freezing. Device.