JPH0748029B2 - Operation control method for chiller / heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to an operation control method for a desk-top chiller-heater.

[Conventional technology]

Fig. 4 and Fig. 5 show the overall structure of the desk-top water cooler / heater. In the figures, (1) is the exterior, the upper half of the front side is overhanging, and the tank (2) is inside the upper half. The lid (3) is stored so that it is exposed on the upper surface of the exterior (1). The tank (2)
The lower part has a small diameter, and the portion above the small diameter lower part is supported by the tank fixing plate (15) on the horizontal tank holding plate (6) which is suspended in the exterior (1).

Then, the cooler (4) was wound around the outer periphery of the small diameter lower part of the tank (2) located in the fixed plate (15), and the heater (5) was attached to the bottom. In the figure, (16) is a heat insulating material arranged in the fixing plate (15).

A compressor (7) and a fan (9) are installed as a machine room in the lower half of the exterior (1) partitioned by the tank holding plate (6), and a condenser is provided on the back side of the exterior (1). (8) is provided, and these and the cooler (4) constitute a refrigeration cycle.

Further, the water injection pipe (2a) is led out from the bottom of the tank (2), and the water injection valve (12) is connected to the tip thereof by operating the lever (13).

The water injection valve (12) has a water injection port (12a), and is housed in the upper part of the recess in the lower half of the front surface of the exterior (1), and the drain case (14) is provided below. Further, a control device (11) such as a micro computer is installed as a control unit on the front side of the exterior (1) on the rear side of the front panel (10) of the upper half overhang portion, and the switches of the control unit are front panel. Make it appear on the surface of (10).

Thus, when cold water is required, the cooler (4) is operated by the compressor (7), the fan (9), the condenser (8), etc. to cool the tank (2), while the hot water is If necessary, warm the tank (2) with the heater (5).

Then, when the water injection valve (12) is opened by the lever (13), cold water or hot water in the tank (2) is discharged from the water injection port (12a) of the water injection valve (12) through the water injection pipe (2a).

By the way, in the case of hot water operation by the heater (5), in order to detect the temperature of the hot water in the tank (2) and perform temperature control,
As in Japanese Utility Model Laid-Open No. 60-41778, a thermostat (17) temperature controller is provided at the bottom of the tank (2).

[Problems to be Solved by the Invention]

As described above, in the conventional control by the temperature controller using the thermostat (17), when the hot water operation is performed without putting water in the tank (2) by mistake, the thermostat (17) is turned on as shown in FIG. There is a time delay before the heat from the heater (5) is transferred.

Due to this delay, the temperature of the temperature sensing part of the thermostat (17) reaches a set temperature, and when the power to the heater (5) is cut off, the heater (5) becomes extremely hot.
The tank (2) may be deformed.

An object of the present invention is to eliminate the inconvenience of the conventional example, and to provide an operation control method of a chiller-heater capable of improving safety by controlling the motor so as not to become high in temperature even in idle operation. is there.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention accommodates a tank having a heater and a cooler in the exterior, and in a hot and cold water machine that connects a water injection pipe by lever operation to a water injection pipe from this tank, a temperature sensor is provided in the tank, In the case of hot water operation with a heater, the detection output of the temperature sensor is introduced into the control device to measure the temperature inside the tank for a certain period of time, and when the temperature change rate during that time exceeds a certain value, the output of the control device If you turn off the heater, and then turn off the heater in this way, energize again after a certain period of time,
ON-OF of the heater under the same conditions until the set temperature level is reached
The point is to repeat F.

[Action]

According to the present invention, as the means for turning off the heater by the temperature control, two means of the temperature change rate detected by the temperature sensor and the set temperature level are used together, and in principle, the temperature detected by the temperature sensor is used. When the temperature reaches the set temperature level, the heater is turned off, but before that, the heater is turned off at the rate of temperature change, and after a certain period of time, the heater is turned off again to suppress a sharp rise in the heater temperature and the temperature sensor temperature The delay of heat conduction to the part can be recovered.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block circuit diagram showing an embodiment of an operation control method for a chiller-heater according to the present invention, and FIG. 2 is a vertical sectional side view of the chiller-heater. FIG. The same components as those of the above are designated by the same reference numerals.

The overall structure of the chiller / heater is the same as the conventional example of FIG. 5 and its detailed description is omitted, but the tank (2) having the heater (5) and the cooler (4) in the upper part of the exterior (1) is omitted. ), The water injection pipe (2a) from this tank (2) is led out to the front of the exterior (1), and the water injection valve (12) operated by the lever (13) is installed outside the exterior (1). (2
It is bound to a).

In the present invention, instead of the thermostat (17) of FIG. 5, a temperature sensor (18) using a thermistor is installed in the tank (2).
This temperature sensor (18) sensor circuit (1
8 ') was connected to a control device (11) by a microcomputer through an A / D converter (19).

A power source (20) and an input device (21) such as a switch are connected to the input side of the control device (11), and a display device (22) such as a lamp, a heater (5) and a compressor (on the output side). The drive circuit (23) of 7) is connected.

Thus, the present invention converts the temperature detection of the temperature sensor (18) into a digital signal by the A / D converter (19) as the output of the sensor circuit (18 ') in the case of hot water operation by the heater (5). And introduce it into the control device (11).

Then, in this control device (11), the measurement result of the temperature in the tank (2) by the temperature sensor (18) is obtained for a certain period of time, and the temperature change rate during that period is pre-programmed as shown in FIG. When the value exceeds a certain value, the power supply to the heater (5) is turned off via the drive circuit (23). After turning off the heater (5) in this way, the power is turned on again after a lapse of a certain time, and ON-OFF of the heater is repeated until the set temperature level is reached.

In addition, the temperature detection of the temperature sensor (18) is the control device (11).
When the temperature exceeds the preset temperature level programmed in advance, the power supply to the heater (5) is turned off by the output of the control device (11), but the temperature change rate is small and the temperature rises gently. Even if the measured temperature exceeds the set temperature level, the heater (5) is turned off.

〔The invention's effect〕

As described above, the operation control method of the hot and cold water dispenser of the present invention,
In a cool / hot water machine that stores a tank with a heater and a cooler in the exterior and connects a water injection pipe from this tank to a water injection pipe by lever operation, if the temperature change rate is a sudden value, turn off the heater, and By energizing again after a lapse of a certain period of time, it is possible to suppress a sudden rise in the heater temperature, and to control the heater so that it does not become hot even when running in the air for safety.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing an embodiment of an operation control method for a chiller-heater according to the present invention, FIG. 2 is a vertical side view of the chiller-heater, and FIG. 3 is a temperature-time correlation showing an operation control operation. 4 and 5 are external perspective views of the chiller-heater, FIG. 5 is a vertical side view of the conventional chiller-heater, and FIG. 6 is a temperature-time correlation diagram showing a conventional example. (1) ... Exterior, (2) ... Tank (2a) ... Water injection pipe, (2b) ... Pipe fixing plate (3) ... Lid, (4) ... Cooler (5) ... Heater, (6) ... Tank holding plate (7) ... Compressor (8) ... Condenser, (9) ... Fan (10) ... Front panel, (11) ... Control device (12) ... Water injection valve, (12a) ... Water injection port (13) ... Lever ( 14)… Drainage case, (15)… Tank fixing plate (16)… Insulation material, (17)… Thermostat (18)… Temperature sensor, (18 ′)… Sensor circuit (19)… A / D converter, ( 20) ... Power supply (21) ... Input device, (22) ... Display device (23) ... Drive circuit

Claims (1)

[Claims] 1. A chiller-hot water machine in which a tank having a heater and a cooler is housed in an exterior, and a water injection pipe from this tank is connected to a water injection valve by a lever operation. In this case, the detection output of the temperature sensor is introduced into the control device to measure the temperature in the tank for a certain period of time, and when the temperature change rate during that time exceeds a certain value, the heater of the output of the control device is used.
When the heater is turned off, and then the heater is turned off in this way, the power is turned on again after a certain period of time, and the heater is turned on and off under the same conditions repeatedly until the set temperature level is reached. .