JPS59195079A - 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 [Technical Field of the Invention] The present invention is directed to cooling operation or removal 71. This relates to a refrigerator equipped with a DC solenoid valve for operation, etc.

[Technical background of the invention and its problems]

For example, in a two-temperature refrigerator equipped with a freezer cooler and a refrigerator cooler, there are two cases in which the refrigerant discharged from the compressor is supplied to the refrigerator cooler and then to the freezer cooler. A DC solenoid valve is provided to selectively switch between supplying only the freezer compartment cooler and bypassing the room cooler. However, in such a refrigerator, conventionally, when driving a DC solenoid valve, the driving current of the DC solenoid valve (necessary to fully operate the DC solenoid valve) is Since the refrigerator is configured to allow a current of more than 200 yen current to flow through the refrigerator, there is a problem in that its power consumption and, in turn, the power required to operate the refrigerator increases.

[Purpose of the invention]

The present invention 1/i has been made in view of the above circumstances, and its purpose is to provide a refrigeration system that can reduce power consumption without interfering with defrosting operation, etc. be.

[invention (already)]

The present invention provides a direct current solenoid valve that is installed in an Inomep ζ refrigerator, and after a predetermined period of time after the DC solenoid valve is started to be driven, the voltage applied to the cough direct current solenoid valve is changed to By providing an adjusting means that lowers the power to a level that can be maintained, the power required to reduce the power consumption during the drive period of the DC electromagnetic valve is reduced.

[Embodiments of the invention]

A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In Fig. 1, which shows an example of a 1° freezing chamber of a two-temperature refrigerator, 1 is a compressor, 2 is a condenser, 6 is a capillary tube, 4 is a refrigerator (room cooler, and 5 is a freezer cooler). , and 6 is a DC solenoid valve, and when the DC solenoid valve 6 is shut off, the refrigerant discharged from the compressor 1 flows into the refrigerator compartment cooler 4 and the freezer compartment cooler 5.
When the pl[α flow solenoid valve 6 is energized and open, the refrigerant discharged from the compressor 1 bypasses the refrigerator compartment cooler 4 and is supplied only to the freezer compartment cooler 5. Become so.

4N In Figure 2, the number of times to control the energization and disconnection of the DC solenoid valve 6: 41% 4'7' (-C) is shown.
In the figure, 7 is a reference voltage generation circuit, which consists of resistors 8 and 9 connected in series between the positive power supply terminal (10) and the ground terminal. Outputs the base voltage V8. 10 is a temperature detection circuit, which connects a series circuit of a resistor 11 and a thermistor 12 installed to detect the temperature inside the refrigerator between the positive power terminal (+■) and the ground terminal "A". The common connection point of the resistor 11 and thermistor 12 outputs a detection voltage Va that varies inversely in proportion to the temperature in the refrigerator compartment. The output of the DC amplifier is configured to be fed back to the non-inverting input terminal f+1, which is the input terminal of the detection voltage Va, via the resistor 14.The output of the DC amplifier 13 is It is also applied to the base of an NPN type transistor 16 via a resistor 15.
is a timer voltage regulator whose collector is connected to the positive power terminal (+■) via the DC solenoid valve 6, and whose emitter is the adjusting means. It is connected to a ground terminal via a terminal 17. The voltage regulator with timer 17 starts a timer operation for a predetermined period of time, for example, t seconds, at the same time as the power is turned on, and exhibits a low resistance value during the timer operation period, and a high resistance value after the timer operation ends. It is the composition.

In this case, the voltage WIW ritual device 17 with voltage is low 4.
1 (when the transistor 16 is turned on in a state where it exhibits a resistance value, it is set in advance so that a voltage is applied that causes the direct current 'q to flow through the magnetic valve 6, and the transistor 16 is turned on. Frost with timer, pressure Ml: 'j
It is set in advance so that when the ritual vessel 17 exhibits a high resistance value, a voltage that allows the holding current to flow is applied to the DC solenoid valve 6. In the case of DC solenoid valve B, its holding current is about 1/1o of the moving current.

In the above configuration, the temperature in the refrigerator compartment is currently in a relatively high state, and the detection voltage Vd output from the temperature detection circuit 10 and the reference ^L pressure V8 from the reference voltage generation circuit 7 are If it is in Section 59, the DC amplifier 16
Since the output of the DC solenoid valve 6. is held at low level (earth level), the transistor 16 is turned off and the DC solenoid valve 6. is closed due to power outage.

Therefore, when the compressor 1 is driven in this state,
The refrigerant discharged from the compressor 1 is supplied to both the refrigerator compartment cooler 4 and the freezer compartment cooler 5,
Thus, each cooling operation of the refrigerator compartment and the freezer compartment is performed. Due to such a cooling operation of the refrigerator compartment, the temperature in the refrigerator compartment decreases and the detection voltage d increases, and when the refrigerator compartment is finally cooled to the set temperature and the relationship V d > V s is established, the direct current increases. 1
At the same time, the output of the amplifier 16 is inverted to high level, and the output is positively fed back through the resistor 14, so that the direct amplifier 16 is self-maintained in a high level signal output state, and at the same time, K
The transistor 16 is turned on by the output of the mm fluency amplifier 3. Then, since the timer voltage regulator 17 starts the timer operation and exhibits a low resistance value for one second, the voltage that allows the current to flow through the DC solenoid valve 6 is increased to the transistor 16. The voltage is applied via the timer voltage regulator 17, and the DC solenoid valve 6 is energized and opened. Further, after this, when the timer I operation of the timer voltage regulator 17 ends and it begins to exhibit a high resistance value, the voltage applied to the DC solenoid valve 6 decreases to a voltage that allows the holding current to flow. -iM' of the DC solenoid valve 6 by a small holding current such as
714 open slope is retained. Therefore, (α current non-6
power consumption is kept low. When the DC solenoid valve 6 is energized in this way, the refrigerant discharged from the compressor 1 bypasses the refrigerator compartment cooler 4 and is supplied only to the freezer compartment cooler 5. Then, the cooling operation of the refrigerator compartment is stopped and only the cooling operation of the freezer compartment is continued. In addition, the air supply of compressor 1 has been changed to the temperature in the freezer compartment: ItlJ '+. When the compressor 1 is cooled, the power is cut off. However, the above-described self-holding state of the DC width filter 13 is released once the compressor 1 is stopped.

FIG. 3 shows a second practical example of the present invention, and only the parts that are different from the first embodiment will be explained regarding the waist, waist, and lower part. In this second embodiment, a positive characteristic thermistor 18 is provided as a regulator (!), and this positive/standby Pi thermistor 18
ki between the emitter of transistor 16 and the ground terminal 2
In particular, it has 1 (in particular, 1).
When turned on, the DC solenoid valve 6 is energized via the transistor 16 and the positive temperature coefficient thermistor 18.

At the beginning of this 1 m current, the positive temperature coefficient thermistor 18 is in a state exhibiting a low resistance, and a relatively high voltage is applied to the DC electromagnetic valve to cause the current to flow, and the DC solenoid valve 6 is activated. Energized and released. After energization is started, when the PTC thermistor 18 self-heats and exhibits a high resistance value, the voltage applied to the DC electromagnetic filter drops to a pressure sufficient to carry its holding current. Therefore, @
As a result of maintaining the energized open state of the DC electromagnetic filter by such a small maintainable current, the power consumption of the DC electromagnetic filter can be suppressed to a low level.

Further, it is necessary to increase the resistance by one shift due to self-heating of the thermistor 18 for eight cycles. In one case, a fourteenth configuration in which a resistor 19 is connected in parallel with the thermistor 18 may be used, as in the third embodiment of the present invention shown in FIG.

In each of the above embodiments, the DC solenoid valve 6 for cooling operation is controlled by the regulating means, but the control unit is not limited to this, and the DC solenoid valve 6 for defrosting operation (i.e., for example, supplying hot gas for cooling a freezer compartment) (or a device for stopping the supply of refrigerant to the freezer compartment cooler when the defrost heater provided in the freezer compartment cooler is energized) may be controlled.

〔Effect of the invention〕

According to the present invention, as is clear from the above explanation, in a refrigerator equipped with a DC IJ solenoid valve for cooling operation or defrosting operation, the cooling operation can be performed without interfering with the τ operation, etc. This has the excellent effect of reducing power consumption.

[Brief explanation of drawings]

1 and 2 show a first embodiment of the present invention,
Fig. 1 is a schematic diagram of the refrigeration cycle, and Fig. 2 is a wiring diagram of the main parts. Moreover, the thresholds in FIG. 3 and 41 are the second thresholds of the present invention, respectively.
Figure 2 (1) shows a good example of the third example.In the figure, 6 is a DC solenoid valve, and 17 is a voltage regulator with a timer (
(adjustment means), 18 is a positive temperature coefficient thermistor (adjustment means). Figure 1 - Figure 2

Claims (1)

[Claims] 1. In a refrigerator equipped with a DC solenoid valve for cooling operation or defrosting operation, it is possible to maintain the applied voltage to the DC solenoid valve in its driving state after a predetermined period of time after the DC solenoid valve starts driving. A refrigerator characterized by being provided with an adjustment means to lower the level.