JPH0152671B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a quick freezing device in which a direct cooling type auxiliary cooler is provided in a part of the freezer compartment of a forced draft type refrigerator-freezer, and in particular, to Relates to blower control devices.

Structure of the conventional example and its problems The conventional example will be explained with reference to FIGS. 2 and 3. 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. Reference numeral 6' denotes a quick-freezing room which is provided with a separate direct cooling type auxiliary cooler 8 within the freezer room 6, and is used to quickly freeze food.

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. 3, the refrigeration cycle includes 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 compressor 9.
→ Condenser 10 → Second capillary tube 12 → Auxiliary cooler 8
→ Main cooler 4 → A flow path control device 13 (hereinafter referred to as flow path switching valve 13) that switches between the compressor 9 and the circulating rapid freezing flow path is provided, and this switching valve 13 performs flow path switching operation. This allows the rapid freezing effect to be carried out.

During this rapid freezing, the compressor 9 is forced to operate continuously, but the blower 5 is rapidly increased in speed from its rated speed in order to eliminate uneven rapid freezing. However, during rapid freezing like this,
If the rotation speed of the blower 5 is suddenly increased above the rated speed, the wind flowing on the surface of the auxiliary cooler 8 will become stronger, and the temperature of the surface will be taken up by the wind, making it difficult for the evaporation temperature to drop to a low temperature and shortening the quick freezing time. As it got longer, it had some drawbacks.

OBJECTS OF THE INVENTION In view of the above-mentioned points, an object of the present invention is to uniformly freeze frozen foods and shorten the freezing time.

Composition of the Invention In order to achieve this object, the present invention increases the evaporation temperature of the auxiliary cooler by increasing the rotation speed of the blower stepwise above the rated rotation speed using temperature or time control during rapid freezing. It is maintained at a low temperature, has no uneven quick freezing, and can shorten the quick freezing time.

DESCRIPTION OF EMBODIMENTS Below, FIGS. 1 a, b,
Explain according to c. It should be noted that the basic structure and refrigeration cycle of the refrigerator are the same as those of the conventional example, and therefore their explanation will be omitted. In the figure, compressor 9 is connected to a power source via relay 15, and blower 5 is connected to relay 16,
After being connected in series with compressor 17, it is connected in parallel with compressor 9. The flow path switching valve 13 is connected in series with the relay 18 and then in parallel with the main circuit power supply. 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 15 is configured to close its contacts when the excitation coil is energized, and the relays 16, 17, and 18 are configured to close their contacts when the excitation coil is not energized.

20 is a blower control device that controls the rotation speed of the blower 5,
The rotational speed is increased stepwise from the rated rotation speed by temperature control that detects the temperature of the auxiliary cooler 8 or by time control.

The blower control device 20 is connected in series with the blower 5 and the relay 19, and constitutes an auxiliary circuit using an auxiliary circuit power source. Note that the relay 19 is configured to close its contacts when the excitation coil is energized.

Next, a control device for driving these relays will be described. 21 is a temperature control device, which includes a thermistor 22, resistors R ₁ , R ₂ , R ₃ , and a thermistor 22 provided in a part of the freezer compartment 12 .
It is composed of a comparator 23. The output of the comparator 23 is configured to send a signal to turn on/off the relay 15 via an OR circuit 24 by a driver circuit (not shown) such as a transistor.

25 is a quick freezing switch, and 26 is a quick cooling time timer. After the quick-freezing switch 25 is turned on, the quick-cooling timer 26 outputs a short-time High signal (hereinafter simply referred to as "H") to the output a, and outputs a quick-freezing signal to the output b, as shown in FIG. 1b. It is connected so as to output an "H" signal for, for example, 90 minutes, and send a signal to the input of the OR circuit 24, the relays 16, 17, 18, 19, and the blower control device 20 to turn them ON/OFF.

Next, the operation 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 22 becomes small, and the point A determined by R _TH and R ₁ of the temperature control device 21 is reached. Since the potential at point B becomes higher than the potential at point B determined by resistors R ₂ and R ₃ and the output of the comparator 23 becomes "H", the output of the OR circuit 24 also becomes "H", and the relay 15 is connected to a transistor (not shown). The compressor 9 is turned ON via a driver circuit such as 1), and the compressor 9 is operated. At this time, the quick freezing switch 25
Since it is in the OFF state, b of the rapid cooling timer 26,
The output is "L", the relays 16 and 17 are on, and the blower 5 is operated. Also relay 18
is ON at the same time, the suction coil of the flow path switching valve 13 is energized, and the refrigerant circuit is connected to the compressor 9 → condenser 10 → first capillary tube 11 → main cooler 4 → compressor 9
A circulation cycle is configured to perform cooling. After that, if the inside of the refrigerator is cooled to a certain temperature, thermistor 2
Since the resistance value _RTH of 2 increases and the A potential becomes smaller than the B potential, the output of the comparator 23 becomes "L", and together with the "L" signal from the b output of the quenching timer 25, the OR circuit 24 The output also becomes "L", so the relay 15 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 rapid freezing operation will be explained. If you turn on the quick freezing switch 25 at your discretion, the quick cooling timer 2 will start.
Among the outputs of 6, output b continues to generate an "H" signal during the quenching time T, so one input of the OR circuit 24 becomes "H" and the output of the OR circuit 24 becomes "H" regardless of the output of the temperature control device 21. H'', the relay 15 is turned on, and the compressor 9 is immediately operated.
At the same time, the relay 18 is turned OFF, the flow path switching valve 13 is de-energized, the flow path is switched to the rapid freezing flow path, and the auxiliary cooler 8 starts its cooling action.

Further, the relays 16 and 17 of the blower 5 are turned off by the b output "H" signal of the cooling timer 26, so that the blower 5 is no longer connected to the main circuit, and the relay 19 is turned on, so that the blower 5 is operated by the auxiliary circuit. At this time, the blower control device 20 is also turned ON, and the rotation speed of the blower 5 is gradually increased from the rated rotation speed as shown in the signal c in Fig. 1c, so that the evaporation temperature of the auxiliary cooler 8 is lowered. The food is retained evenly in quick freezing, and the quick freezing time can be shortened.

Effects of the Invention As is clear from the above configuration, the present invention provides a quick freezing chamber equipped with a direct cooling type auxiliary cooler in the freezer compartment of a forced ventilation type refrigerator-freezer, and during normal cooling, only the main cooler is used. During rapid cooling, the flow path control device switches the refrigerant to flow through both the main cooler and the auxiliary cooler, and during rapid cooling, the blower rotation speed is gradually raised above the rated rotation speed. Because of this structure, the surface of the evaporator is brought to a low temperature while the air flowing to the surface of the auxiliary cooler does not change significantly, so that the rapid freezing time can be shortened.

[Brief explanation of drawings]

FIG. 1a is a control circuit diagram showing an embodiment of the present invention, FIGS. 1b and 1c are operation explanatory diagrams showing the operating status of the blower control device, FIG. 2 is a sectional view of a refrigerator showing a conventional example, and FIG. Figure 3 is a piping diagram of the refrigeration cycle. 3... Cooling room, 4... Main cooler, 5... Blower, 8... Auxiliary cooler, 6'... Rapid freezing room, 9
...Compressor, 13...Flow path control device, 25...Rapid freezing switch, 20...Blower control device.

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 A direct cooling type auxiliary cooler installed, a flow path control device that controls whether the refrigerant flows only to the main cooler or both the main cooler and the auxiliary cooler, and a compressor of the refrigeration cycle are connected continuously. a quick-freezing switch that performs quick freezing by operating and continuously flowing refrigerant to the auxiliary cooler; and a blower control device that increases the rotational speed of the blower stepwise above the rated rotational speed during the rapid freezing. A quick freezing device for a refrigerator equipped with.