JPS6091171A - Rapid optical refrigerator 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 apparatus in which a direct cooling type auxiliary cooler is provided in a part of a freezer compartment of a forced draft type refrigerator-freezer or the like.

Structure of a conventional example and its problems The conventional example is shown in FIGS. 1 and 2. Reference numeral 1 denotes a forced draft type refrigerator in which air cooled by a main cooler 4 stored in a cooling chamber 3 formed between heat insulating walls 2 is circulated by a blower 5 to a freezing chamber 6 and a refrigerating chamber 7. 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 mostanoto 10 is provided at the entrance of the refrigerator compartment 7 to adjust the amount of cooling inflow. As shown in FIG. 2, the refrigeration cycle consists of a normal flow path that circulates compressor 11 - condenser 12 - first capillary tube 13 - main cooler 4 = compressor 11, and compressor 11 -
A flow path for rapid freezing that circulates between the condenser 12 - second capillary tube 14 - auxiliary cooler 9 - main cooler 4 - compressor 11, and a flow path control device 16 ( The compressor 11 is forced to operate continuously during rapid freezing by switching the flow path of the switching valve 15 (hereinafter referred to as a switching valve 15), and the refrigerant continues to flow into the auxiliary cooler 9. By maintaining the temperature at a low temperature, the freezing speed of the food that comes into contact with the auxiliary cooler 9 is increased. When the door 16 is opened or closed during quick freezing, outside air enters the freezer compartment 6 and frost forms on the surface of the auxiliary cooler 9, which has reached an extremely low temperature. Not only does the thermal conductivity of the auxiliary cooler 9 decrease and the freezing speed of food slows down, but also when the door 16 is opened and closed frequently, a large amount of frost forms on the auxiliary cooler 9, causing forced ventilation by the blower 5 after normal operation is resumed. The frost in the auxiliary cooler 9 cannot be completely sublimated by the sublimation action of the cold air, and the remaining frost develops and freezes, which further reduces the thermal conductivity.

OBJECTS OF THE INVENTION In view of the above points, an object of the present invention is to prevent frost formation on the auxiliary cooler when the door is opened during rapid freezing.

Structure of the Invention In order to achieve this object, the present invention releases the flow path switching valve only while the door is open during quick freezing, and allows the refrigerant to flow only into the main cooler, thereby eliminating outside air that has entered the freezing chamber. The main cooler dehumidifies the water and prevents the auxiliary cooler from getting stuck.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. Note that the cross section of the refrigerator and the refrigerant circuit are the same as those of the conventional example, so in the explanation of the four embodiments, the first one will be used.
2 and 2, the same parts as in the conventional example are denoted by the same reference numerals as in the conventional example, and detailed explanation thereof will be omitted.

In the figure, the compressor 11 is connected to a power source via a relay 17, and the blower 5 is connected in series with a single-pole, single-throw blower control door switch 19, and then connected in parallel with the compressor 11. ing. It is connected in series with the flow path door assembly 18 and then in parallel with the power source. This flow path switching valve 1
5 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. Here, the relay 1γ closes the contact when the excitation coil is energized, and the door switch 18,
The blower control door switch 19 is configured to close the contacts a when the door 16 is closed and open the contacts a when the door is open, and the flow path control relay 20 is configured to open the contacts when the excitation coil is de-energized. ing.

Next, a control device for driving these relays 17 and 20 will be described. Reference numeral 21 denotes a temperature control device, which includes a thermistor 22 provided in a part of the freezer compartment 6, resistors R1, R2, R3, and a comparator 23.

The output of the comparator 23 is configured to send a signal to turn the relay 17 OFF by a dry circuit (not shown) such as a transistor via an OR circuit 24. 25 is a quick freezing switch, and 26 is 1@, a cold time timer. When the quick freezing switch 26 is turned on, the quick cooling time timer 26 is set to a short period of time when the quick freezing switch 26 is turned on, as shown in FIG.
When a high signal (hereinafter simply referred to as "H") is input, the configuration is such that 11 HI+ is outputted to the b output for, for example, 90 minutes during rapid freezing. The b output of the quenching time timer 26 sends a signal to turn the relay 17 ON and OFF, and is connected to the input of the OR circuit 24.

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

Normally, when the crystallinity (freezer compartment temperature) inside the refrigerator is higher than a predetermined value, the resistance value RTH of the thermistor 22 is small, and the potential at point A determined by RTH and R4 of the temperature control device 21. is higher than the potential at point B determined by resistors R2 and R3, and the output of the comparator 23 becomes H'', so the output of the OR circuit 24 also becomes tt Hn, and the relay 17
is turned on via a driver circuit such as a transistor (not shown), and the compressor 11 operates. At this time, the quick freezing switch 25 is in the OFF state, so the quick cooling timer 26 is
The output is a low signal (hereinafter referred to as "L" for jli)
The flow path control relay 20 is OFF, the suction coil of the flow path switching valve 16 is de-energized, and the refrigerant circuit is connected to the compressor 11.
A circulation cycle of - coagulant 12 - first capillary tube 13 - main cooler 4 - compressor 11 is configured to perform normal cooling. When the door 16 is opened, the a contact of the blower control door switch 19 is closed and the blower 5 is operated, and when the door 16 is open, the a contact of the blower control door switch 19 is opened and the blower 5 is stopped. After that, if the inside of the refrigerator is cooled to a constant temperature of 1, the resistance value RTH of the thermistor 22 increases and the A potential becomes smaller than the B potential, so the output of the comparator 23 becomes 11 L I+, and the quenching timer 26 starts. The output of the OR circuit 24 together with the "L" signal from the b output.
Therefore, the relay 17 is turned OFF, and the compressor 11 and the blower 5 are stopped.This operation is repeated thereafter (-
It performs the normal cooling effect.

Next, the rapid freezing operation will be explained. When the rapid freezing switch 25 is turned on arbitrarily, the b output of the rapid cooling timer 26 continues to generate an "H" signal during the rapid cooling time T, so it is OR.
One input of the circuit 24 becomes H1, which is related to the output of the temperature control device 21 (the output of the OR circuit 24 becomes H#,
When the relay 17 is ON, the compressor 11 is immediately operated. At the same time, the flow path control relay 20 is turned on, the flow path switching valve 15 is energized, the flow path is switched to the rapid freezing flow path, and the auxiliary cooler 9 starts its cooling action. On the other hand, the a contact of the door switch 18 is closed, and when the door 16 is opened during rapid freezing, the a contact of the door switch 18 is opened and the flow path switching valve 15 is de-energized, and the normal refrigeration flow path is switched on. Since the cooling is performed by switching, the outside air that has entered the freezer compartment is dehumidified by the main cooler 4. Further, when the door 16 is closed, the a contact of the door switch 18 is closed and the flow path switching valve 15 is energized.

Effects of the Invention As is clear from the above configuration, the present invention provides a quick freezing chamber with a direct cooling type auxiliary cooler installed in the freezer compartment of a forced draft type refrigerator-freezer, and only the main cooler is used during normal cooling. During rapid freezing, a flow path control device such as a flow path switching valve is used to switch the flow of refrigerant to both the main cooler and auxiliary cooler, and when the door is opened during rapid freezing, the flow path switching device is switched. This device is configured to stop the operation and operate the flow path switching device only when the door is closed, and the outside air that enters when the door is opened or closed during quick freezing will cause frost to form on the surface of the auxiliary cooler and reduce the thermal conductivity to the food. As a result, the freezing time of foods can be prevented from slowing down, and the practical effect is extremely high.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional refrigerator, Fig. 2 is a refrigeration cycle piping diagram thereof, Fig. 3 is a control circuit diagram showing one implementation of the present invention, and Fig. 4 is the quenching time shown in Fig. 3. This is a time chart of the timer. 3...Cooling room, 4...Main cooler, 5...
...Blower, 8.. Rapid freezing chamber, 9.. Auxiliary cooler, 11.. Compressor, 15.. Flow path control device (switching control valve), 18.. Door Switch, 25...
...Quick freezing switch. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] A blower that circulates air cooled by a main cooler provided in the cooling chamber to the freezer and refrigerator compartments, a quick freezing room provided in the freezer compartment through which air cooled by the main cooler passes, and this quick freezing. a direct cooling type auxiliary cooler placed indoors; 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;
A quick freezing switch that performs quick freezing by continuously operating the compressor of the refrigeration cycle and continuously flowing refrigerant to the auxiliary cooler, and a quick freezing switch that releases the operation of the flow path control device when the door is opened during quick freezing, and A quick freezing device for a refrigerator equipped with a door switch that allows refrigerant to flow only into the cooler.