JPS6082768A - Refrigerator with rapid 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 cold air forced draft 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 its problems Page 2 Conventionally, as shown in Fig. 1, in refrigerators with a cold air forced draft system in which air cooled by a main cooler 1 is ventilated into the freezer compartment and the refrigerator compartment by a blower 2, It is known that a quick freezing chamber 4, which is separately provided with a direct cooling type auxiliary cooler 3, is formed in the room to quickly freeze food. In this case, the refrigeration cycle consists of compressor 5→
The normal flow path that circulates from condenser 6 → first capillary 7 → main cooler 1 → compressor 6 is connected to compressor 6 → condenser 6 → second capillary 8 → auxiliary cooler 3 → main cooler 1 →The flow path for rapid freezing that circulates with the compressor 5 is switched by a flow path switching device (hereinafter referred to as a flow path switching valve) 9, and during rapid freezing, the compressor 5 is forced to operate continuously to effect rapid freezing. It is something that allows you to do this.

Defrosting a refrigerator that is equipped with a quick freezing device is usually done in this way.
For frost on the auxiliary cooler 3, it is common to sublimate it by cold air forcibly circulated by the blower 2 during normal operation, but for frost on the main cooler 1, a conventional rapid freezing device is installed. Similar to the cold air circulation type refrigerator, the defrosting heater 10 disposed in the main cooler 1 was used to defrost the air at regular intervals of -3.

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 door of the refrigerator is opened and closed frequently and used frequently, or if food that has not yet been fully chilled is placed inside the refrigerator, the temperature inside the refrigerator will rise at an accelerated rate. This is more noticeable in the freezer, where there is a large temperature difference between the container and the outside temperature. As a result, even if the compressor 6 starts operating immediately after defrosting, it takes a long time for the freezer compartment to return to the normal operating temperature, which has a negative impact on stored frozen foods, etc. was there.

Purpose of the Invention In view of the above 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 refrigerant to an auxiliary cooler installed in the freezing chamber for a certain period of time after defrosting is completed, regardless of whether rapid cooling operation is in progress or not. DESCRIPTION OF THE 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, and the partition wall 1
Freezer compartment 13 in the upper part by 2. The lower part is divided into a refrigerator compartment 14. 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 thermostand 16 is provided at the entrance of the refrigerator compartment 14 to adjust the amount of cold air inflow. A main cooler 1 of the refrigeration cycle is built in the partition wall 12, and the generated cold air is forced into the freezer compartment 13, the quick freezing compartment 4, and the refrigerator compartment 14 via a damper thermostat 15 using a blower 2. ing. Page 6 A defrosting heater 10 is disposed around the main cooler 1.

In addition, as a refrigerating cycle, a compressor 5 is used as shown in Fig. 3.
→ Condenser 6 → First capillary → Main cooler 1 → Compressor 6 Normal annular refrigeration cycle and compressor 6 → Condenser 6 → Second capillary 8 → Auxiliary cooler 3 → Main cooler 1 → A flow path switching valve 9 provided at the outlet of the condenser 6 is configured to arbitrarily switch between the compressor 5 and the annular refrigeration cycle for rapid freezing.
Next, the electric circuit will be explained.

First, regarding the electric circuit, compressor 5. The blower 2° and the defrosting heater 1o are connected to the relay 16. They are each connected in parallel to the power supply Z via relays 17, and the relay 16 closes the contact when the excitation coil is energized, and the relay 17 closes the circuit of the defrosting heater 1° when the excitation coil is energized. Compressor 6. when energized. Close the circuit of blower 2. 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 forms a rapid freezing flow path when the excitation coil of the relay 18 is energized, and is configured to switch to a normal six-page flow path when the excitation coil of the relay 18 is not energized.

Next, the control circuit that drives these relays 16 and 18 will be described. Reference numeral 19 is a temperature control device, and numeral 19 is a thermistor 20. It is composed of resistors R1, R2, R3 and a comparator 21. The output of the comparator 21 is configured to send a signal to turn the relay 16 ON/10FF 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 time timer. The quick cooling timer 24 outputs a HIGH signal (hereinafter "H1+") for a predetermined period of time after the quick freezing switch 230 is turned on.
). One side of the output of the quenching timer 24 is connected to the input of the OR circuit 22, and the other side is connected to the input of the OR circuit 26 to set the relay 1 day to 0N10.
It is connected to send a signal to cause FF.

26 is a defrosting end detection device, which is a thermistor 27 installed around the cooler 10. Resistance R1', R2', R3'
.

It is composed of a comparator 28.

The output of the comparator 28 sends a signal to turn the relay 17 to 0N10FF via an inverter 29 and an AND circuit 30, and the output of the AND circuit 30 is connected to the OR circuit 26 via an inverter 31 and a timer 32. The output of the comparator 28 is connected to the reset terminal H of the R-S clip-flop 33.The set terminal S of the R-S flip-flop 33 is connected to the clock pulse source 34. An AND circuit 35, one of which is connected to the output from the OR circuit 22, is connected via an integration timer 36, and the output of the R-87 Rinop 70 tube 33 is configured to be connected to the AND circuit 30. There is.

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 is small and A determined by RTH and R1 of the temperature control device 19.
The potential of the point becomes higher than the potential of point B, and the output of the comparator 21 becomes "H", so the output of the OR circuit 22 also becomes "H", and the relay 16 is connected to the 1B Kaisho GO-82768 (3) transistor (not shown). ), the compressor 5 and the 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 6 → condenser 6 → first capillary child cooler 1 → compressor 5 Cooling is performed by forming a circulation cycle.

After that, if the inside of the refrigerator is cooled to a certain temperature, thermistor 2
Since the resistance value RTH of o increases and the A potential becomes smaller than the B potential, the output of the comparator 21 becomes a LOW signal (hereinafter referred to as "L"), and together with "Ll+" from the quenching timer 24, the relay 16 is turned off, and the compressor 6 and blower 2 are stopped.This operation is repeated thereafter to perform the normal cooling operation.

Next, when performing quick freezing, if you turn on the quick freezing switch 23, the quick cooling timer 24 continues to output the output signal "H" for a predetermined period of time, thereby causing the
Since one input of the R circuit 220 becomes "H", a H"'9 page signal is output regardless of the output of the temperature control device 19. Therefore, the relay 16 is turned ON, and the compressor 5 is turned on.
, the blower 2 is operated. At the same time, the rapid cooling timer 24
Since the output of is +1HI+, the output of the OR circuit 25 becomes H'', and the excitation coil of the relay 18 is energized via a driver circuit such as a transistor (not shown), and the suction coil of the flow path switching valve 9 is energized. The refrigerant circuit is switched to a rapid freezing refrigerant circuit of compressor 6 → condenser 6 → second capillary tube 8 → auxiliary cooler 3 → main cooler 1 → compressor 5.

Next, control during defrosting will be explained. A constant sine pulse is output from the clock pulse source 34, and the OR circuit 2
Since it is input to the AND circuit 35 along with the output of 2, 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 this number of pulses, and after inputting a certain number of pulses. Generates one pulse as output. This pulse is input to the cent terminal of the R-S flip-flop 33, and at the same time, it outputs an "H" signal for a certain period of time T'.

In addition, the resistance RTH' of the thermistor 2710 page of the defrosting end detection device 26 and R1/, l(2/, R3/
At the temperature at which defrosting ends, the potential at point C becomes greater than the potential at point D, and the defrosting end detection device is configured to output "H1+," and the output is L I+ except when defrosting ends.

In other words, the output via the inverter 29 is normally 'HI+
Therefore, the output via the AND circuit 3o is H'' only when the output from the R-S flip-flop 33 becomes HI+ at the start of defrosting, and the relay 17 switches to the defrosting circuit and starts defrosting. In this case, the time T' when the output from the R-8 Noritsubu flop 33 becomes H'' is 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 nH1+. It is configured to be sufficiently larger than the time it takes to That is, the defrosting end detection device 26
When the signal becomes ffHl+, the energization to the excitation coil of the relay 17 is stopped and normal operation is resumed. At this time, the temperature inside the freezer compartment 13 is rising, but at the same time as the defrosting ends, the output of the inverter 31 connected from the AND circuit 3o becomes +1HI+, and remains high for a certain period of time T after inputting "H".
When the timer 32 outputs 1+, the "HIT11 page" is energized through the OR circuit 25 to the excitation coil of 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
→ Switches to the compressor 6) (Fig. 6) 0 At this time, the temperature in the freezer compartment has risen sufficiently, so the relay 16 is necessarily closed. Further, it is unnecessary to set the time T during which quick freezing is performed after defrosting to a time at 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 conventional "temperature recovery time" for the freezer compartment temperature is shortened.

Effects of the Invention As is clear from the above explanation, the present invention provides a direct cooling type auxiliary cooler in the freezer compartment of a forced draft type refrigerator, and uses a flow path control device to control the normal flow path in which refrigerant flows only to the main cooler. There is a device that can switch the quick freezing channel that flows refrigerant to both the auxiliary cooler and the main cooler, and after the main cooler is defrosted, the channel is forcibly switched to the quick freezing channel for a certain period of time. As a result, the use of the quick freezing function has expanded, and the temperature inside the freezer, which rises rapidly during defrosting, can be quickly returned to the pre-defrosting temperature, reducing food damage due to temperature rises. , the practical effect is extremely large.

[Brief explanation of drawings]

Figure 1 is a sectional view of a refrigerator showing an example of a conventional example;
The figure is a diagram of the refrigeration cycle, Figure 3 is a sectional view of a refrigerator showing an embodiment of the present invention, Figure 4 is a diagram of the refrigerator, Figure 5 is an electric circuit diagram, and Figure 6 is a diagram showing the operating status. It is. 1...Main cooler, 2...Blower, 3.
... Auxiliary cooler, 4 ... Rapid freezing chamber, 6
... Compressor, 9 ... Flow path control device, 1
o...Defrosting heater. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure II Figure 4

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 through which air cooled by the main cooler partitioned in the freezer compartment passes, and this quick freezing. The main cooler includes a direct cooling type auxiliary cooler provided at the bottom of the chamber, and 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 refrigerator equipped with a quick freezing device that forces a refrigerant to flow through both the main cooler and the auxiliary cooler for a certain period of time after the cooler has finished defrosting.