JPS6214842B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature control device having a so-called differential in which the on-point temperature and the off-point temperature are different. The present invention provides a device suitable for the case where the amount of water decreases.

Conventionally, for example, a refrigerator 1' having a temperature control device
As shown in Fig. 1, when the thermoswitch Th2' placed in the temperature controlled area is turned on, the solenoid 3a' of the solenoid valve 3' draws air, the valve opening opens, and the refrigerant is condensed from the compressor 4'. The refrigerant is supplied to the evaporator 7' through the refrigerant 5', the solenoid valve 3', and the expansion valve 6'. Conversely, when the thermoswitch Th2' is turned off, the solenoid valve 3' closes and the refrigerant supply is stopped. The suction side piping of the compressor 4' becomes low pressure, a low pressure switch 9' connected to the power source 8' is opened, and the compressor 4' is stopped. Also, the refrigerator 1' is selected to be suitable for the maximum load, and at this time, the compressor 4' is operated continuously, and the thermoswitch Th
Compressor 4' operates at the on-point temperature (ON) of 2',
The temperature is set to a desired temperature S. Also, when the load applied to refrigerator 1' decreases from the maximum load,
As shown in Fig. 2, the compressor 4' is operated intermittently, and the compressor 4' is operated at the on-point temperature (ON) of the thermoswitch Th2', and the temperature is set slightly lower than the desired temperature S. off point temperature (OFF)
Continue driving until. Furthermore, the compressor 4' stops at the off point temperature (OFF), and the desired temperature (S) is reached.
The stopped state continues until the on-point temperature (ON) is set at a slightly higher temperature.

As can be seen from the above, there is a differential between the on-point temperature and off-point temperature of the temperature control device, and therefore, during intermittent operation of the refrigerator, the desired temperature is reached within the temperature-controlled region. A problem arises in that the refrigerator continues to be energized unless it reaches its off-point temperature. This also applies to heaters. That is, as shown in FIG. 2, the conventional temperature control device has a temperature characteristic with a long intermittent cycle, resulting in a large amount of energy loss. Furthermore, if the differential is made too small, the intermittent cycle becomes too short and the life of the compressor 4' may be shortened.

The present invention has been made in view of the drawbacks of the above-mentioned conventional examples, and its purpose is to provide a device suitable for when the load applied to a refrigerator or heater is reduced from the maximum load, that is, a device suitable for a refrigerator or heater. When the equipment operates intermittently, the power supply to the refrigerator or heater is forcibly stopped when the temperature within the temperature-controlled area drops or rises slightly below the desired temperature.
The object of the present invention is to provide a device that achieves power saving. For example, in the case of a refrigerator, the first thermoswitch's off point is set at a temperature slightly lower than the desired temperature point, and when a predetermined period of time has elapsed from that off point, the refrigerator is turned off. The purpose is to forcibly stop the power supply to. Of course, when the load is low, the time for the temperature to fall from the off point of the first thermoswitch to the off point of the second thermoswitch for cutting off power to the equipment will be shorter than the above predetermined time, so the second The energization to the refrigerator is stopped at the off point of the thermoswitch.

The present invention will be explained below with reference to FIGS. 3 and 7 showing examples.

FIG. 3 shows a temperature control device for a refrigerator, and its temperature characteristics are shown in FIGS. 4 to 6.

First, referring to FIG. 3, 1 is an AC power supply, 2 is a first thermoswitch _Th1 , and is installed in a temperature-controlled area (not shown). 3 is
A second thermoswitch _Th2 is similar to the first thermoswitch _TH12 , is installed in a similar area, and finally stops energizing the solenoid S, which will be described later, at this off-point temperature. 2nd thermoswitch
The off-point temperature Th ₂ (OFF) of Th ₂ 3 is lower than the off-point temperature Th ₁ (OFF) of the first thermoswitch Th ₁ 2. That is, the off point temperature Th ₁ (OFF) of the first thermo switch Th ₁ 2 and the second thermo switch
The relationship between the off point temperature Th ₂ (OFF) of Th ₂ 3 is Th ₁
(OFF)>Th ₂ (OFF). Note that the first thermoswitch Th ₁ 2 and the second thermoswitch Th ₂
The relationship between the on-point temperatures Th ₁ (ON) and Th ₂ (ON) in 3 is
Th ₁ (ON) > Th ₂ (ON). 4 is a solenoid S, and when energized, a solenoid valve (not shown) opens in the same way as in the conventional example shown in FIG.
Solenoid valve - supplied to the evaporator via an expansion valve. Further, when the solenoid S4 is de-energized, the valve is closed and the low pressure switch is opened to stop the compressor.
5 is a first relay R ₁ connected in series to the first thermo switch Th ₁ 2, and its operation open switch
r ₁ '6 is connected in series to the time limit relay DR7, and the operation close switch r ₁ 8 is inserted between the series circuit of the second thermo switch Th ₂ 3 and the delay operation open switch dr9 of the time limit relay DR7 and the solenoid S4. Connecting.
10 is a second relay _R2 , which is connected in parallel to the solenoid S4, and its operation close switch _R211
is connected in parallel to the operating close switch r ₁ 8 of the first relay R ₁ 5. When the time limit relay DR7 is energized, its delay operation opens switch dr9 after a predetermined period of time has elapsed.
The switch dr9 is opened, and when it becomes de-energized, the switch dr9 is closed.

In the embodiment configured as described above, first, when the load is at maximum (the area to be temperature controlled is high temperature), the fourth
Referring also to the figure, since the first thermoswitch Th ₁ 2 and the second thermoswitch Th ₂ 3 always close their contacts, the first relay R ₁ 5 is energized;
As a result, the operation of the first relay R ₁ 5 closes switch r ₁ 8
is closed, the operation open switch r ¹ '6 is opened, and the time limit relay DR7 is de-energized, and its delayed operation open switch dr
9 is closed, the solenoid S4 is energized via the second thermoswitch Th ₂ 3, the delayed action opening switch dr9 and the action closing switch r ₁ 8. Of course, when the first relay R ₁ 5 is energized, the second relay R ₂
10 is also energized, so the solenoid S4 is also energized via the operating close switch r ₂ 11 of the relay R ₂ 10. In addition, the solenoid valve opens by energizing the solenoid S4, and refrigerant is supplied to the evaporator, and the fourth
As shown in the figure, the temperature-adjusted region is gradually cooled down to a desired temperature S.

Next, when the load decreases from the maximum load,
Referring also to FIG. 5, the first thermoswitch
When Th ₁ 2 and the second thermoswitch Th ₂ 3 are closed, the temperature of the temperature-controlled area is lowered by the above-described operation. In addition, since the load is reduced, the area temperature falls further below the desired temperature S, and at the off-point temperature Th ₁ (OFF) of the first thermoswitch Th ₁ 2, the first thermoswitch Th ₁ 2 is opened and the first relay R ₁ 5 is de-energized. Therefore, the solenoid S4 is powered through the path of the second thermoswitch Th ₂ 3, the delayed opening switch dr9 and the closing switch r _{2 11} of the second relay R 2 10. Further, when the first thermo switch Th ₁ 2 opens, the operation open switch r ₁ '6 of the first relay R ₁ 5 closes,
Since the time limit relay DR7 is energized, as shown in FIG. 5, when a predetermined time t has elapsed from the opening of the first thermoswitch _Th12 , the delay operation open switch dr9 of the above path opens and the solenoid S4 is de-energized. As a result, the compressor stops and the temperature of the temperature-controlled area increases. Also, during this temperature rise, the second
The thermo switch Th ₂ 3 is closed, but the time limit relay DR7 is energized and its delay operation open switch dr9 is open, so the solenoid S4 is not energized. When the temperature rise further reaches the on-point temperature Th ₁ (ON) of the first thermoswitch Th ₁ 2, the first thermoswitch Th ₁ 2 closes and the first relay R ₁ 5 is energized, resulting in a time limit. relay DR
7 becomes de-energized, and the solenoid S4 again turns on the second thermo switch _Th23 , the delay operation open switch dr9 of the time limit relay DR7, and the first relay.
Electricity is applied via the operation open switch R ₁ 8 of R ₁ 5, and the temperature is lowered by the operation described above.

In this way, when the load is slightly reduced from the maximum load, the power supply to the refrigerator is forcibly cut off after a predetermined period of time has passed since the off-point temperature Th ₁ (OFF) of the first thermo switch _{Th 1} 2. Because it stops, it does not cool down too much, and unnecessary electricity is eliminated, which saves power. This can be understood from a comparison with the temperature retention of the conventional example shown by the broken line in FIG.

Next, when the load is low (temperature-controlled area is low temperature), referring also to Fig. 6, when the first thermoswitch Th ₁ 2 and the second thermoswitch Th ₂ 3 are closed, the above-mentioned The operation energizes solenoid S4. As a result, the temperature of the temperature-controlled region decreases, and since the load has been sufficiently reduced, the temperature decreases further below the desired temperature S. Therefore, the first thermoswitch Th ₁ 2 has its off-point temperature Th ₁ (OFF)
Its contacts open and the first relay R ₁ 5 becomes de-energized. At this time, the solenoid S4 is connected to the second thermo switch Th ₂ 3 and the delay operation open switch dr 9.
and the operation closing switch r ₂ 1 of the second relay R ₂ 10
Power is supplied via one route. The temperature further decreases to the off-point temperature of the first thermoswitch Th ₁ 2
Before the predetermined time t has elapsed since Th ₁ (OFF), the off point temperature of the second thermoswitch Th ₂ 3 Th ₂ (OFF)
, the second thermoswitch Th ₂ 3 is opened, the above path is opened, and the solenoid S4 is
No electricity is supplied, and the temperature of the temperature-controlled area increases. When the first thermo switch Th ₁ 2 is opened, the time limit relay DR 7 is energized, and its delayed opening switch dr 9 is opened at point C in FIG. 6 after the second thermo switch Th ₂ 3 is opened, but at this time Solenoid S4
is not energized and does not affect operation. In addition, the area temperature rises, and the second thermoswitch Th ₂ 3 reaches the on-point temperature Th ₂ (ON), and even if its contacts are closed, the first relay R ₁ 5 is de-energized, and its operation close switch is Since r ₁ 8 is open, solenoid S
4 is not energized. When the area temperature further rises, the first thermoswitch Th ₁ 2 increases the on-point temperature Th ₁
(ON), the delay operation open switch dr9 of the time limit relay DR7 and the operation close switch _r18 of the first relay _R15 are closed, and of course the second thermo switch is closed.
Since Th ₂ 3 is also closed, power is supplied to solenoid S4, and the temperature of the region begins to decrease due to the above-described operation.

FIG. 7 shows a temperature control device for a heater, and its temperature characteristics are shown in FIGS. 8 to 10.

The device shown in FIG. 7 has a heater H12 connected in parallel to the second relay R ₂ 10 in place of the solenoid S4 in FIG. 3, and is otherwise constructed in the same manner as the embodiment shown in FIG. . Also, a first thermoswitch Th ₁ 21 and a second thermoswitch Th ₂ 31
The relationship is that the off point temperature Th 1 (OFF) of the first thermo switch Th ₁ 21 is the off point temperature Th ₁ (OFF) of the second thermo switch Th ₂ 3
It is lower than the off point temperature Th ₂ (OFF) of No. 1 (Th ₁ (OFF) < Th ₂ (OFF)).

Note that _the on-point temperatures Th ₁ (ON) and Th 2 of the first thermoswitch Th ₁ 2 and the second thermoswitch Th ₂ 3 are
(ON) relationship is Th ₁ (ON) < Th ₂ (ON).

In the embodiment having the above configuration, first of all, in the case of maximum load (temperature-controlled area is low temperature), the first thermoswitch Th ₁ 21 and the second thermoswitch Th ₂ 31 are Since the contact is always closed, the first relay R ₁ 5 is energized, and as a result, the operation close switch r ₁ 8 of the first relay R ₁ 5 is closed, and the operation open switch r ₁ '6 is opened, and the time limit relay DR 7 is closed.
is de-energized and its delayed opening switch dr9 is closed, so the heater H12 is switched to the second thermoswitch.
It is energized via Th ₂ 31, the delayed action open switch dr9, and the action close switch _r18 . Of course, since the second relay R ₂ 10 is also energized at the same time as the first relay R ₁ 5 is energized, the heater H12 is connected to the relay R ₂ 1.
0 operation close switch r ₂ 11 is also energized. Further, by energizing the heater H12, the temperature-adjusted region is gradually heated to a desired temperature S as shown in FIG.

Next, when the load decreases from the maximum load,
Referring also to FIG. 5, the first thermoswitch Th ₁
21 and the second thermoswitch Th ₂ 31 are closed, the temperature of the temperature-controlled area increases due to the above-described operation. Also, since the load is reduced, the desired temperature S
The temperature rises further than the first thermo switch.
At the off-point temperature Th ₁ (OFF) of Th ₁ 21, the first thermoswitch Th ₁ 21 opens and the first relay R ₁ 5 opens.
becomes de-energized. Therefore, the heater H12 is connected to the second thermo switch Th ₂ 31 and the delayed operation open switch dr.
9 and second relay R ₂ 10 operating close switch r ₂
Power is supplied through 11 routes. Also, when the first thermo switch Th ₁ 21 opens, the first relay
R ₁ 5 operation open switch r ₁ '6 closes time relay DR
7 is energized, the first
A predetermined time t after opening of the thermo switch Th ₁ 21
After , the delay operation open switch of the above path is activated.
dr9 is opened, heater H12 is de-energized, and as a result, the temperature of the temperature-controlled area decreases. When the temperature further decreases and reaches the on-point temperature Th ₁ (ON) of the first thermoswitch Th ₁ 21, the first thermoswitch
Th ₁ 21 is closed, the first relay R ₁ 5 is energized, and as a result, the time limit relay DR7 is de-energized, and the heater H12 is energized again and the temperature rises in the manner described above.

In this way, if the load is slightly lower than the maximum load, the power supply to the heater will be forcibly stopped when a predetermined time has elapsed from the off point temperature Th ₁ (OFF) of the first thermo switch Th ₁ 21. This prevents overheating and eliminates unnecessary electricity, which saves power.

Next, when the load is low (the temperature controlled area is high temperature), refer to Figure 10.
When the Th ₁ 21 and the second thermoswitch Th ₂ 31 are closed, the temperature of the temperature-adjusted region is further increased from the desired temperature S by energization of the heater H12. And the first thermo switch Th ₁ 21 has its off point temperature
Th ₁ (OFF) opens its contacts, resulting in the first relay R ₁ 5 being de-energized. At this time, the heater H12 is energized through the path of the second thermoswitch Th ₂ 31, the delay opening switch dr9, and the closing switch r ₂ 11 of the second relay R ₂ 10. The temperature rises further and the first thermo switch
If the off point temperature Th _{2 (} OFF) of the second thermoswitch Th ₂ 31 is reached before the predetermined time t has elapsed from the off point temperature Th ₁ (OFF) of the second thermoswitch Th 1 21, the second thermoswitch Th ₂ 31 is opened and the above-mentioned path is opened, the heater H12 is de-energized, and the temperature of the temperature-controlled area decreases. Note that when the first thermo switch Th ₁ 21 is opened, the time limit relay DR7 is energized, and the delay operation open switch dr9 is turned on.
7 after a predetermined time, the second thermo switch
It opens at point C in FIG. 10 after opening Th ₂ 3, but at this time the heater H12 is already de-energized and does not affect the operation. In addition, the temperature of the temperature-controlled area decreases, and the second thermoswitch Th ₂ 3 lowers the on-point temperature Th ₂
(ON) and even if that contact is closed, the first relay remains
Since R ₁ 5 is de-energized and its operating close switch r ₁ 8 is open, heater H12 is de-energized. When the area temperature further decreases, the first thermoswitch Th ₁ 2 reaches the on-point temperature Th ₁ (ON), which closes its contacts, energizes the first relay R ₁ 5, and deactivates the time limit relay DR7. The heater H12 is energized again.

In the above embodiments, the first thermoswitch _Th1 and the second thermoswitch _Th2 have been described as switches having contacts.
The device may also be turned on and off. Furthermore, when opening and closing a switch using a thermistor,
A plurality of outputs may be taken out from one thermistor and switched without separately providing the first thermoswitch _Th1 and the second thermoswitch _Th2 .

In the embodiment shown in FIG. 3, a compressor may be directly connected in place of the solenoid S4.

Although the embodiments have been described above, the present invention includes a first thermoswitch Th ₁ 2, 21 and a second thermoswitch Th ₂ having a different off point temperature from that of the first thermoswitch Th 1 2, 21 _. A device that energizes equipment such as a refrigerator or a heater when the operation of 3 and 31 is closed, and de-energizes it when the operation of the second thermoswitch Th _{2 and} 3 and 31 is opened, the first thermoswitch Th ₁ 2,
The switch dr9 of the relay DR7, which opens after a predetermined period of time after the relay DR7 is energized, is connected in series to the second thermoswitch Th ₂ 3, 31. This temperature control device is characterized by forcibly stopping the power supply to the equipment, so if the load applied to equipment such as refrigerators and heaters decreases from the maximum load, the equipment will be turned off intermittently. drive,
The characteristic is to move toward the off-point temperature of the second thermoswitch, which is relatively far away from the desired temperature point, but the off-point of the first thermoswitch is set at a temperature slightly lower or higher than the desired temperature point. Since power to the equipment is forcibly stopped after a predetermined period of time has elapsed, power saving can be achieved. That is, in the case of a refrigerator, power is turned off to the compressor and the like when the temperature of the temperature-controlled area becomes slightly lower than the desired temperature, so that excessive cooling can be prevented and at the same time unnecessary power supply can be eliminated. Conversely, in the case of a heater, the heater is turned off when the temperature of the area to be controlled reaches a temperature slightly higher than the desired temperature, thereby preventing overheating and achieving power savings.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a conventional temperature control device for a refrigerator, FIG. 2 is a temperature characteristic diagram of FIG. 1, and FIG. 3 is a circuit diagram showing a temperature control device for a refrigerator according to an embodiment of the present invention. Figures 4, 5, and 6 are temperature characteristic diagrams of the embodiment shown in Figure 3. Figure 4 shows the case at maximum load, and Figure 5 shows the case when the load is slightly reduced from the maximum load. FIG. 6 shows the case at low load. FIG. 7 is a circuit diagram showing a temperature control device for a heater according to an embodiment of the present invention, FIGS. 8, 9, and 10 are temperature characteristic diagrams of the embodiment of FIG. 7, and FIG. In the case of a load, FIG. 9 shows a case where the load is slightly reduced from the maximum load, and FIG. 10 shows a case of a low load. 2...First thermo switch Th ₁ , 3...Second
Thermoswitch Th ₂ , 4... Solenoid S, 7
...Time limit relay DR, 9...Time limit relay DR delay operation open switch dr, 12...Heater H.

Claims (1)

[Scope of Claims] 1. When the first thermoswitch and the second thermoswitch whose off-point temperature is lower than that of the first thermoswitch are closed, the refrigerator is energized, and the second thermoswitch is closed.
A device that is de-energized by the opening operation of the first thermoswitch, which energizes the time-limited relay by the opening operation of the first thermoswitch, and the switch of the relay that opens after a predetermined period of time has elapsed after the relay is energized. Connected in series to a second thermoswitch to forcibly stop energizing the refrigerator, and after energizing the time limit relay, the off-point temperature of the second thermoswitch is reached within a predetermined time. A temperature control device characterized in that, at times, the electricity supply to the refrigerator is forcibly stopped by opening the second thermoswitch. 2 The heater is energized by the closing operation of the first thermoswitch and the second thermoswitch whose off-point temperature is higher than that of the first thermoswitch, and is de-energized by the opening operation of the second thermoswitch. The device energizes a time-limited relay by the opening operation of the first thermoswitch, and opens the relay after a predetermined period of time has elapsed after energizing the relay, and connects the switch of the relay in series to the second thermoswitch, and The power supply to the heater is forcibly stopped, and when the off point temperature of the second thermoswitch is reached within a predetermined time after the power supply to the time limit relay is energized, the second thermoswitch is opened. A temperature control device characterized by forcibly stopping power supply to a heater.