JPH0235226B2 - KYUSOKUREITOSOCHIOSONAETAREIZOKO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cold air forced draft type refrigerator having a quick freezing device in which a direct cooling type auxiliary cooler is provided in a part of the freezer compartment.

Conventional Structure and Problems Conventionally, as shown in Fig. 1, in a refrigerator with a cold air forced draft system in which air cooled by a main cooler 1 is ventilated into a freezer compartment and a refrigerator compartment by a blower 2, there is no air inside the freezer compartment. It is known that a quick freezing chamber 4 separately provided with an auxiliary cooler 3 of a direct cooling type is formed to quickly freeze food. In this case, the refrigeration cycle consists of a normal flow path that circulates from the compressor 5 to the condenser 6 to the first capillary tube 7 to the main cooler 1 to the compressor 5 as shown in Figure 2. →Second
A flow path switching device (hereinafter referred to as a flow path switching valve) 9 switches the flow path for rapid freezing, which circulates from capillary tube 8 → auxiliary cooler 3 → main cooler 1 → compressor 5, and further compresses during rapid freezing. The machine 5 is forced to operate continuously to perform a rapid freezing action.

Normally, when defrosting a refrigerator equipped with such a rapid freezing device, frost that has formed on the auxiliary cooler 3 is sublimated by cold air that is forcibly circulated by the blower 2 during normal operation. However, the frost in the main cooler 1 is heated and defrosted at a certain period by the defrosting heater 10 placed in the main cooler 1, similar to conventional cold air circulation type refrigerators that are not equipped with a quick freezing device. Was.

However, in a device that heats and defrosts the main cooler 1 in this way, the heat during defrosting enters the freezer and refrigerator compartments, causing the internal temperature to rise, especially during defrosting and for a while after defrosting. If the compartment door is opened and closed frequently and used frequently, or if food that has not yet been chilled is placed inside the refrigerator, the temperature inside the refrigerator will rise at an accelerated rate. This is more noticeable in the freezer compartment, where the temperature difference is large, and the temperature difference is large with the outside temperature. As a result, even if the compressor 5 starts operating immediately after defrosting, it takes a long time for the freezer compartment to return to the normal operating temperature, which can adversely affect stored frozen foods, etc. It was hot.

Purpose of the Invention In view of the above-mentioned points, the present invention aims to quickly return the temperature inside the freezer compartment to normal temperature after defrosting.

Structure of the Invention In order to achieve this object, the present invention forcibly flows a refrigerant to an auxiliary cooler installed in the freezing chamber for a certain period of time after the end of defrosting, regardless of whether it is in rapid cooling operation or not. This speeds up the temperature return of the freezer compartment.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. Incidentally, the same parts as in the prior art are given the same reference numerals, and the explanation will be omitted.

In Figures 3 to 6, 11 is the refrigerator main body;
A partition wall 12 divides the compartment into a freezer compartment 13 at the top and a refrigerator compartment 14 at the bottom. A quick freezing chamber 4 is provided within the freezing chamber 13 and has a direct cooling type auxiliary cooler 3 disposed at the bottom thereof. Further, a damper thermostat 15 is provided at the entrance of the refrigerator compartment 14 to adjust the amount of cold air flowing in. A main cooler 1 of the refrigeration cycle is built in the partition wall 12, and the generated cold air is sent to the freezer compartment 13, the deep freeze compartment 4, and the refrigerator compartment 14 via a damper thermostat 15 using a blower 2. Forced ventilation is applied. A defrosting heater 10 is disposed around the main cooler 1. In addition, as shown in Fig. 3, the refrigeration cycle consists of compressor 5 → condenser 6 → first capillary →
Normal annular refrigeration cycle of main cooler 1 → compressor 5 and annular refrigeration for quick freezing of compressor 5 → condenser 6 → second capillary 8 → auxiliary cooler 3 → main cooler 1 → compressor 5 The cycle is configured to be switched arbitrarily by a flow path switching valve 9 provided at the outlet of the condenser 6.

Next, the electric circuit will be explained.

First, regarding the electric circuit, the compressor 5, blower 2, and defrosting heater 10 are connected to relays 16 and 17.
The relay 16 closes the contact when the excitation coil is energized, and the relay 17 closes the circuit of the defrosting heater 10 when the excitation coil is energized, and compresses when the excitation coil is not energized. The circuits of blower 5 and blower 2 are closed. Further, the relay 18 is connected in series with the flow path switching valve 9 and then connected in parallel with the power supply Z. The flow path switching valve 9 is configured to form a rapid freezing flow path when the excitation coil of the relay 18 is energized, and to switch to a normal flow path when the excitation coil is not energized.

Next, we will discuss the control circuit that drives these relays 16 and 18. 19 is a temperature control device that includes a thermistor 20 and a resistor installed in a part of the freezer compartment 13.
It is composed of R ₁ , R ₂ , R ₃ and a comparator 21. The output of the comparator 21 is configured to send a signal to turn on/off the relay 16 via an OR circuit 22 by a driver circuit (not shown) such as a transistor.

23 is a quick freezing switch, and 24 is a quick cooling timer. The rapid cooling timer 24 is configured to continue outputting a HIGH signal (hereinafter referred to as "H") for a predetermined period of time after the rapid freezing switch 23 is turned on. One of the outputs of the quenching timer 24 is connected to the input of the OR circuit 22, and the other is connected to the OR circuit 25 so as to send a signal to turn the relay 18 ON/OFF.

26 is a defrosting end detection device, which includes a thermistor 27 installed around the cooler 1, resistors R ₁ ′, R ₂ ′, R ₃ ′,
It is composed of a comparator 28.

The output of the comparator 28 is connected to an inverter 29,
A signal for turning ON/OFF the relay 17 is sent through an AND circuit 30, and the output of the AND circuit 30 is connected to the OR circuit 25 through an inverter 31 and a timer 32. Also, the output of the comparator 28 is sent to the R-S flip-flop 3.
It is connected to the reset terminal R of No. 3. and,
The set terminal S of this R-S flip-flop 33
is an AND circuit 3 whose one end is connected to the output from the OR circuit 22 from the clock pulse source 34.
5. Connected via integration timer 36,
The output of the R-S flip-flop 33 is the AND
The circuit 30 is configured to connect to the circuit 30 .

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 _RTH of the thermistor 20 becomes small, and the potential at point A determined by _RTH and _R1 of the temperature control device 19 increases. is higher than the potential at point B, and the output of comparator 21 becomes “H”, so OR
The output of the circuit 22 also becomes "H", the relay 16 is turned on via a driver circuit such as a transistor (not shown), and the compressor 5 and blower 2 are operated.

At this time, the quick freezing switch 23 is in the OFF state, the suction coil of the flow path switching valve 9 is not energized, and the refrigerant circuit is compressor 5 → condenser 6 → first capillary tube 7 → main cooler 1 → compressor Cooling is performed by configuring a circulation cycle of 5.

After that, when the inside of the refrigerator is cooled to a certain temperature, the resistance value R _TH of the thermistor 20 increases and the potential A changes to B.
Since the potential becomes smaller than the potential, the output of the comparator 21 becomes a LOW signal (hereinafter referred to as "L"), and together with the "L" from the quenching timer 24, the relay 16 turns OFF and the compressor 5 and blower 2 stop. do. Thereafter, this action is repeated to perform the normal cooling action.

Next, when performing quick freezing, if you turn on the quick freezing switch 23, the quick cooling timer 24 continues to output an output signal "H" for a predetermined period of time, which causes one input of the OR circuit 22 to is "H", so the "H" signal is output regardless of the output of the temperature control device 19. Therefore, relay 16 is ON
Then, the compressor 5 and the blower 2 are operated. At the same time, since the output of the quenching timer 24 is "H", the output of the OR circuit 25 is "H", and the relay 18 is passed through a driver circuit such as a transistor (not shown).
The excitation coil is energized, the suction coil of the flow path switching valve 9 is energized, and the refrigerant circuit is connected from the compressor 5 to the condenser 6.
→Second capillary tube 8→Auxiliary cooler 3→Main cooler 1→
The refrigerant circuit is switched to the quick freezing refrigerant circuit of the compressor 5.

Next, control during defrosting will be explained. A constant sine pulse is output from the clock pulse source 34,
Since the output of the AND circuit is input to the AND circuit 35 along with the output of the OR circuit 22, the output of the AND circuit is output as a sine pulse only when the relay 16 is energized, and the integration timer 36 integrates the number of pulses to generate a certain pulse. After inputting a number, one pulse is generated as an output. This pulse is applied to the R-S flip-flop 33.
It is input to the set terminal of , and at the same time outputs an "H" signal for a certain period of time T' as an output.

In addition, the thermistor 27 of the defrosting end detection device 26
The resistors R _TH ′, R ₁ ′, R ₂ ′, and R ₃ ′ are configured so that at the temperature at which defrosting ends, the potential at point C becomes greater than the potential at point D, and the defrost end detection device outputs “H”. The output is "L" except when defrosting is completed. That is, since the output via the inverter 29 is normally "H", the output via the AND circuit 30 is output from the R-S flip-flop 3 at the start of defrosting.
It is "H" only when the output from 3 becomes "H", and the relay 17 switches to the defrosting circuit and starts defrosting. In this case, the time T' during which the output from the R-S flip-flop 33 becomes "H" is the period from the start of defrosting to the time when the thermistor 27 is heated by the heating during defrosting and the output of the defrosting end detection device becomes "H". It is configured to be sufficiently larger than time. That is, when the signal from the defrosting end detection device 26 becomes "H", the energization to the excitation coil of the relay 17 is stopped and normal operation is resumed. At this time, the internal temperature of the freezer compartment 13 is rising, but as soon as defrosting is completed, the AND circuit 3
The output of the inverter 31 connected from 0 is “H”
Therefore, “H” is output to the OR circuit 25 by the timer 32 which outputs “H” for a certain period of time T after inputting “H”.
The excitation coil of the relay 18 is energized via the relay 18, the flow path switching valve 9 is operated, and the rapid freezing flow path (compressor 5 → condenser 6 → second capillary tube 8 → auxiliary cooler 3 → main cooler 1 → compression The machine switches to 5) (Figure 6). At this time,
Since the temperature of the freezer compartment has risen sufficiently, the relay 16 is necessarily closed. It goes without saying that the time T during which quick freezing is performed after defrosting is set to a time during which the temperature of the freezer compartment can sufficiently return to the temperature before defrosting.

Therefore, as shown by the chain line in FIG. 6, the time required for the temperature in the freezer to return to normal is shortened.

Effects of the Invention As is clear from the above description, the present invention is provided in a refrigerant flow path, and during normal operation, the refrigerant flows only to the main cooler, and during quick freezing operation and after the completion of defrosting of the main cooler. By providing a flow path control device that allows refrigerant to flow through both the main cooler and the auxiliary cooler for a certain period of time, the application of the quick freezing function can be expanded, and it can be used in freezing rooms where the temperature rises rapidly during defrosting. The practical effects are extremely large, as the temperature inside the refrigerator can be quickly returned to the temperature during normal use, and there is little spoilage of food due to temperature rise.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a refrigerator showing an example of the conventional example, Fig. 2 is a diagram of the same refrigeration cycle, Fig. 3 is a sectional view of the refrigerator showing one embodiment of the present invention, and Fig. 4 is the same refrigeration cycle. FIG. 5 is an electric circuit diagram, and FIG. 6 is a diagram showing the operating situation. 1... Main cooler, 2... Blower, 3... Auxiliary cooler, 4... Rapid freezing chamber, 5... Compressor, 9...
Flow path control device, 10...Defrosting heater.

Claims (1)

[Claims] 1. A blower that circulates the air cooled by the main cooler provided in the cooling room to the freezer and refrigerator compartments, a quick-freezing room through which the air cooled by the main cooler that is partitioned in the freezer compartment passes through, and A direct cooling type auxiliary cooler installed at the bottom of the freezer compartment and a refrigerant flow path installed in the refrigerant flow path. During normal operation, the refrigerant flows only to the main cooler, and during quick freezing operation and defrosting of the main cooler. A refrigerator equipped with a rapid freezing device comprising a flow path control device configured to allow refrigerant to flow through both the main cooler and the auxiliary cooler for a certain period of time after the cooling ends.