JPS6333630B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a refrigerator having a freezer compartment and a refrigerator compartment;
In particular, it relates to a rapid cooling device for refrigerators that can rapidly cool the freezer compartment as needed.
The purpose of this is to create a rapid cooling system for refrigerators that does not have any risk of the temperature in the refrigerator compartment rising inadvertently after the rapid cooling operation of the freezer compartment is completed, and will not adversely affect the stored items in the refrigerator compartment. is to provide.

A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 shows an example of a known refrigeration cycle to which the present invention is applied. In FIG. 1, 1 is a cooler for the freezer compartment, and 2 is a cooler for the refrigerator compartment. These coolers 1 and 2 are arranged in the freezer compartment and the refrigerator compartment, respectively, and are internally filled with a liquid refrigerant (e.g. It is configured to directly cool the interiors of the freezer compartment and the refrigerator compartment as the compressed and liquefied dichlorodifluoromethane evaporates. 3 is a compressor, 4 is a condenser, 5 is a main capillary tube, 6 is an auxiliary capillary tube, 7 is a bypass capillary tube, and 8 is a solenoid valve serving as a flow path control device. In such a refrigeration cycle, as the compressor 3 is energized, the vaporized refrigerant compressed by the compressor is liquefied through the condenser 4, etc., and the liquid refrigerant thus generated is used for cooling the freezer compartment. It is designed to be supplied to the refrigerator 1 and the cooler 2 for the refrigerator compartment. Further, the solenoid valve 8 is configured to be in a closed state when the power is cut off and to be in an open state when the power is turned on. cooler 2
When the liquid refrigerant is in the open state, the liquid refrigerant is switched to the "second state" where the liquid refrigerant is supplied only to the freezer compartment cooler 1 via the bypass capillary tube 7. state.

FIG. 2 shows a schematic electrical circuit configuration of the present invention. In FIG. 2, reference numeral 9 denotes a temperature switch for the freezer compartment, which has a well-known configuration and is turned on when the temperature inside the freezer compartment is higher than the set temperature. It is connected to the. Reference numeral 11 denotes a temperature switch for the refrigerator compartment of a well-known configuration that detects the temperature in the refrigerator compartment and turns off when the temperature exceeds a set temperature, and a series circuit between this and the solenoid valve 8 is connected between both terminals of the power plug 10. There is. 12 is a relay having a normally open contact 12a, 13 is a relay also having a normally open contact 13a, one normally open contact 12a is connected in parallel with the temperature switch 9 for the freezer compartment,
The other normally open contact 13a is the temperature switch 9 for the freezer compartment.
It is connected between the common connection point of the compressor 3 and the common connection point of the refrigerator compartment temperature switch 11 and the solenoid valve 8. Incidentally, the relays 12 and 13 are controlled by a timer device 14 as described later.

Now, FIG. 3 shows a specific configuration of the timer device 14 and parts related thereto.
This will be discussed below. That is, the automatic return normally open type set switch 15 is a switch for the quick freezing chamber.
A series circuit consisting of a reset switch 17 and a resistor 16, a series circuit consisting of an automatic reset normally open type reset switch 17 and a resistor 18, and a Zener diode 19 with the polarity shown are connected through a resistor 20 between the positive power supply terminal +V _DD and the ground terminal. The common connection point of the set switch 15 and the resistor 16 is connected to the R-S in the timer device 14.
Flip-flop 21 (two flip-flops in this embodiment)
(consisting of a NOR circuit), and the common connection point of the reset switch 17 and resistor 18 is connected to the flip-flop 21.
It is connected to the reset input terminal R of. Therefore,
When the set switch 15 is turned on, the flip-flop 21 receives a high level signal at the set input terminal S, receives a low level signal at the reset input terminal R, and outputs a low level signal from the reset output terminal. When the reset switch 17 is turned on, the set input terminal S receives a low level signal, the reset input terminal R receives a high level signal, and the reset output terminal outputs a high level signal. On the other hand, 22 is a transistor for driving the relay 12, 23 is a transistor for driving the relay 13, and the excitation coil 1 of the relay 12 is
2b and the series circuit between the collector and emitter of the transistor 22, and the excitation coil 13b of the relay 13.
and a series circuit between the collector and emitter of the transistor 23 are connected between the positive power supply terminal +V _DD and the ground terminal, respectively. In addition, a light emitting diode 2 is installed to indicate that the freezer compartment is in rapid cooling mode.
A series circuit of 4 and a resistor 25 is connected in parallel with the exciting coil 13b. Now, in the timer device 14, 26 is a binary counter that receives and counts clock pulses output from the CR oscillation circuit 27 at the clock input terminal CK, and this binary counter 26 is activated only when the input of the clear terminal CL is at a low level. The clock pulses are counted, and when the counted value reaches "2 ¹³ ", a high level signal is output from output terminal Q ₁₃ , and when the counted value reaches "2 ¹⁴ ", a high level signal is output from output terminal Q ₁₄ . This is a configuration that outputs a signal. The period of the clock pulse output from the CR oscillation circuit 27 can be adjusted by a variable resistor 27a, so that after the binary counter 26 starts counting, the outputs of its output terminals _Q13 and _Q14 are The time required for inversion to a high level signal, that is, the time limit, can be set within the range of 30 to 90 minutes and 60 to 180 minutes, respectively. The output terminal Q ₁₄ of the binary counter 26 is connected to the reset input terminal R of the flip-flop 21, and the output terminal Q ₁₃ is connected to one input terminal of the NOR circuit 28. The other input terminal of this NOR circuit 28 is connected to the reset output terminal of the flip-flop 21, and the output terminal is connected to the base of the transistor 23 via a resistor 29. Also, the clear terminal CL of the binary counter 26 is connected to the reset output terminal of the flip-flop 21, and this reset output terminal is
It is also connected to the base of the transistor 22 via a NOT circuit 30 and a resistor 31.

Next, the operation of the above configuration will be explained. In a normal cooling operation state in which the set switch 15 is not turned on, when both the freezer compartment and the refrigerator compartment are at or above the set temperature, the freezer compartment temperature switch 9 is turned on and the compressor 3 is driven.
Furthermore, the temperature switch 11 for the refrigerator compartment is turned off, and the solenoid valve 8 is closed and switched to the "first state". Therefore, the liquid refrigerant discharged from the compressor 8 is supplied to both the refrigerator compartment cooler 2 and the freezer compartment cooler 1, thereby cooling both the refrigerator compartment and the freezer compartment. Due to this cooling operation, the temperature inside the refrigerator compartment decreases, and the temperature switch 11 for the refrigerator compartment decreases.
When turned on, the solenoid valve 8 is energized and switched to the "second state", so that the liquid refrigerant discharged from the compressor 3 is supplied only to the freezer compartment cooler 1, and the cooling operation of the freezer compartment is started. Continued. When the temperature inside the freezer compartment decreases due to such cooling operation and the freezer compartment temperature switch 9 is turned off, the compressor 3
The power is cut off and the operation of the refrigeration cycle is stopped. After this, when the temperature of the freezer compartment rises above the set temperature, the temperature switch 9 for the freezer compartment is turned on and the operation of the compressor 3 is restarted, and the solenoid valve 8 is opened or closed depending on the temperature of the refrigerator compartment. By this,
The same cooling operation as described above is repeated.

Next, a case will be described in which a rapid cooling operation of the freezer compartment is performed, which is suitable for home freezing or when it is desired to quickly freeze water. That is, the variable resistor 27
When the time limit of the binary counter 26 is appropriately set using a and the set switch 15 is turned on, a low level signal is output from the reset output terminal of the flip-flop 21, and this low level signal is sent to the clear terminal of the binary counter 26. CL, NOT circuit 30 and NOR circuit 28, respectively. Therefore, binary counter 2
6 starts counting clock pulses from the CR oscillator 27, and the transistor 22 receives the high level signal inverted by the NOT circuit 30 and turns on. Furthermore, at the time when the binary counter 26 starts counting, the counting contents are cleared to the initial state and low level signals are output from the output terminals Q ₁₃ and Q ₁₄ , as will be understood from the description below. A low level signal is input to both input terminals of the NOR circuit 28, and the NOR circuit 28 outputs a high level signal, thereby turning on the transistor 23. When the transistors 22 and 23 are turned on in this way, the light emitting diode 24 lights up, and
Excitation coils 12b and 13b of relays 12 and 13
Since the normally open contacts 12a and 13a are turned on, the compressor 3 is turned on via the normally open contact 12a.
An energizing circuit for the solenoid valve 8 via the normally open contacts 12a and 13a is formed. For this reason,
At the same time as the compressor 3 is energized and driven, the solenoid valve 8 is de-energized and switched to the "second state",
Therefore, the liquid refrigerant discharged from the compressor 3 is supplied only to the freezer compartment cooler 1, and rapid cooling operation in the freezer compartment is performed. When the count value of the binary counter 26 reaches "2 ¹³ " after the time set by the variable resistor 27a has elapsed after such rapid cooling operation is started, a high level signal is output from the output terminal Q ₁₃ . Since the signal is applied to the NOR circuit 28, the NOR circuit 28 outputs a low level signal and the transistor 23 is turned off. Then, the light emitting diode 24
While the light goes out, the normally open contact 13a of the relay 13 turns off, so the solenoid valve 8 is shut off and switched to the "first state", thereby ending the rapid cooling operation of the freezer compartment. Liquid refrigerant is again supplied to both the freezer compartment cooler 1 and the refrigerator compartment cooler 2.

By the way, during the period when the solenoid valve 8 is switched to the "second state" and rapid cooling operation of the freezer compartment is performed, the temperature TF in the freezer compartment drops to nearly -40°C, as shown in Fig. 4. However, during this period, no liquid refrigerant is supplied to the refrigerator compartment cooler 2, so the temperature TR in the refrigerator compartment gradually increases. Therefore, if the drive of the compressor 3 is stopped immediately after the rapid cooling operation of the freezer compartment is completed, the temperature in the refrigerator compartment will drop.
There is a risk that TR will further rise and have an adverse effect on the stored items inside, and this tendency is due to the fact that the re-on timing of the freezer temperature switch 9 is delayed due to the fact that the freezer room temperature TF is becoming lower. It gets even bigger. However, in the configuration of this embodiment, as described above, the liquid refrigerant is supplied to both the freezer compartment cooler 1 and the refrigerator compartment cooler 2 after the rapid cooling operation of the freezer compartment is completed. As shown, the temperature in the refrigerator room TR starts to decrease, and the temperature in the refrigerator room decreases.
This can prevent an accidental increase in TR. In this case, the temperature TF in the freezer compartment increases, but the limit of the increase is below the optimum temperature of the freezer compartment, so there is no problem.

Now, when the count value of the binary counter 26 reaches "2 ¹⁴ " after a certain period of time has passed after the solenoid valve 8 switches to the "first state", a high level signal is output from the output terminal Q ₁₄ . Since this is applied to the reset input terminal R of the flip-flop 21, the flip-flop 21 is reset and a high level signal is output from its reset output terminal Q. Then, binary counter 2
6 is cleared to the initial state, and the transistor 22 is turned off, so the normally open contact 12a of the relay 12 is turned off, and the energization circuit of the compressor 3 via this normally open contact 12a is briefly cut off. Refrigerant supply to the freezer compartment cooler 1 and the refrigerator compartment cooler 2 is stopped. When the reset switch 17 is turned on during the rapid cooling operation of the freezer compartment, a high level signal is output from the reset input terminal of the flip-flop 21, turning off both the transistors 22 and 23, which causes the compressor 3, Solenoid valve 8 and light emitting diode 24
are all cut off, and the rapid cooling operation is stopped.

FIG. 5 shows a second embodiment of the present invention, and only the differences from the first embodiment will be described below. That is, 32 is a defrost switch that turns on between contacts (c and b) when manually operated, and this is a defrost switch that turns on between contacts (c and b) when the temperature of the freezer compartment cooler 1 (see Figure 1) reaches a predetermined temperature or higher. Automatically returns to the on state during (c-a). 33 is a timer device;
It consists of a first timer 34 and a second timer 35. The first timer 34 is a timer motor 34
a, cam switches 34b and 34c, and when the timer motor 34a is energized, the cam switch 34
b, 34c and after maintaining this state for a predetermined period of time, for example, 45 minutes, the cam switch 34c is turned on.
4b and 34c are turned off. Second timer 35
has a timer motor 35a and a cam switch 35b, and when the timer motor 35a is energized, it turns on the cam switch 35b, and after maintaining this state for a predetermined period of time, for example, 30 minutes, it turns off the cam switch 35b. On the other hand, 36 is an automatic reset normally open type set switch which is a quick freezing switch;
7 is an automatic reset normally closed reset switch, 38 is a defrost heater for the freezer compartment, and 39 is a defrost switch 32.
The so-called DS heater to guarantee the automatic return of 4
0 is a fuse, 41 is a door switch, and 42 is an interior light, which are connected between both terminals of a power plug 10 together with a compressor 3, a solenoid valve 8, a temperature switch 9 for the freezer compartment, a temperature switch 11 for the refrigerator compartment, etc. It is connected like this.

In such a configuration, when the set switch 36 is turned on, the timer motors 34a and 35a are turned on.
is energized and the cam switches 34b, 34c, 35
b is turned on, the first timer 34 exhibits a self-holding state due to the energization path via the cam switch 34c, and the energization path of the compressor 3 via the cam switch 34b and the cam switch 34b,
An energizing path for the electromagnetic valve 8 is now formed via the solenoid valve 35b. Therefore, the compressor 3 is energized, the solenoid valve 8 is switched to the "second state", and the rapid cooling operation of the freezer compartment is started in the same manner as in the first embodiment. Thereafter, when the cam switch 35b is turned off after 30 minutes set in the second timer 35 have elapsed, the solenoid valve 8 is shut off and switched to the "first state", and the freezer compartment is closed. At the same time as the rapid cooling operation is ended, the drive of the compressor 3 is continued and the freezer compartment cooler 1 and the refrigerator compartment cooler 2 are operated.
(See Figure 1 for both) Liquid refrigerant is supplied to both. After this, when another 15 minutes have elapsed, in other words, when the 45 minutes set in the first timer 34 have elapsed after the set switch 36 was turned on, the cam switches 34b and 34c are turned off, so that the timer motors 34a and 35a are turned off. As the power is cut off,
The compressor 3 and the solenoid valve 8 are also cut off, and the supply of refrigerant to the freezer compartment cooler 1 and the refrigerator compartment cooler 2 is stopped.

In addition, in the above embodiment, the freezer compartment cooler 1
and a refrigerator compartment cooler 2, the liquid refrigerant flowing through each of these coolers 1 and 2 directly cools the freezer compartment and the refrigerator compartment, and the flow path of the liquid refrigerant is controlled by a flow path control device. Although we have described a system in which control is performed using the solenoid valve 8, air that is cooled by a cooler and circulated by a fan in accordance with the drive of the compressor is used as the cooling medium, and the air is transferred to the freezer compartment and It can also be applied to a refrigerator equipped with a damper that can be switched between a first state in which the supply is supplied to both the refrigerator compartments and a second state in which the supply is supplied only to the freezer compartment.

According to the present invention, as is clear from the above description, there is a first state in which the cooling medium is supplied to both the freezing compartment side and the refrigerator compartment side, and a second state in which the cooling medium is supplied only to the freezing compartment side. In a refrigerator rapid cooling system, which is equipped with a flow path control device that can switch between the following states and the state of It is possible to achieve the excellent effect that there is no possibility that the temperature will rise unexpectedly, and that it will not have an adverse effect on the stored items in the refrigerating room.

[Brief explanation of drawings]

1 to 4 relate to the first embodiment of the present invention, and FIG. 1 is a diagram showing a refrigeration cycle;
FIG. 2 is a general electrical circuit diagram, FIG. 3 is a diagram showing the electrical configuration of the main parts, and FIG. 4 is a temperature characteristic curve diagram for explaining the operation. Further, FIG. 5 is an overall electrical circuit diagram showing a second embodiment of the present invention. In the figure, 1 is a freezer cooler, 2 is a refrigerator cooler, 3 is a compressor, 8 is a solenoid valve (flow path control device), 14 and 33 are timer devices, and 15 and 36 are set switches (for quick freezing). switch).

Claims (1)

[Claims] 1 A compressor for a cooler that generates a refrigerant for cooling the inside of the refrigerator in an energized driving state, a first state in which the refrigerant is supplied to both the freezer compartment and the refrigerator compartment, and a first state in which the refrigerant is supplied only to the freezer compartment. In a refrigerator equipped with a flow path control device that can be switched to a second state in which the refrigerator compressor A refrigerator characterized in that a timer device is provided for switching the flow path control device to the second state for a preset time and then to the first state for a certain period of time during the period when the energizing path is formed. Cooling system.