JPS5956034A - Temperature controlling method of air conditioner - Google Patents

Abstract

PURPOSE:To enable to control the temperature and humidity finely, by keeping the rest period of an air conditioner always constant while prolonging the operation period when the room temperature is raised to a point at which a thermostat is turned ON during the previous rest period of a compressor and shortening the operation period when the room temperature is lowered to a point at which the thermostat is turned OFF during operation of the compressor. CONSTITUTION:As to the operation period and rest period of a compressor, the rest period is always kept constant and the period of the n-th operation is basically constant. However, if the room temperature is raised to a point at which a thermostat is turned ON during the n-th rest period of the compressor, the operation period is prolonged. On the other hand, if the room temperature is lowered to a point at which the thermostat is turned OFF during the (n-1)th operation, the operation period is shortened. That is, the rest periods t1'-t7' are equal and operation periods t1-t4, t6 are equal. However, the period t5 of the fifth operation is made longer than the operation periods t1-t4, t6 since the room temperature is raised to the point at which the thermostat is turned ON during the fifth rest period. That is, if the rest period is set to be shorter than that of the conventional arrangement, variation of the room temperature can be made smaller than the difference of the ON-OFF points of the thermostat, so that the room temperature can be made controllable.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a temperature control method for an air conditioner that controls the operation and stop of a compressor to adjust the room temperature based on the temperature detected by a temperature detector5. Conventional configuration and its problems In conventional air conditioners, as shown in Figure 3, when the indoor temperature falls below the thermo-off point, the compressor is operated, and when the temperature falls below the thermo-off point, the compressor is stopped and the indoor air conditioner is turned off. It was regulating the temperature.

This method inevitably brings the indoor temperature to the thermo-on point.

Since the thermostat fluctuates between the thermostat's off points, the range of change in indoor temperature is determined by the differential between the thermostat's on point and thermostat off point. That is, as the compressor changes from stop to start, and from start to stop, the indoor temperature fluctuates from the thermo-off point to the thermo-on point, and from the thermo-on point to the thermo-off point.

Therefore, the range of indoor temperature change from stop to operation and from operation to stop of the compressor is determined by the differential between the thermo-on point and the thermo-off point, and there has been a drawback that the temperature change range cannot be suppressed to be smaller than this differential.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks, and aims to perform fine temperature and humidity control by reducing the range of change in indoor temperature when a compressor starts and stops, and from stops to starts. It is something.

Structure of the Invention In order to achieve this object, the present invention is equipped with a temperature control device that controls the indoor temperature by operating and stopping the compressor using a temperature sensor. Furthermore, if the indoor temperature reaches the thermo-on point during the previous compressor stop, the compressor operating time is increased, and the operating time is set to a constant value in advance. The operating time of the compressor is shortened when the thermo-off point is reached.

Description of examples Hereinafter, one embodiment of the present invention will be described with reference to FIG. 1 of the accompanying drawings.

This will be explained with reference to FIG. 2 and FIGS. 4 to 7.

First, the refrigeration cycle will be explained with reference to FIG.

In the figure, 1 is a compressor, 2 is an indoor heat exchanger, 3 is an outdoor heat exchanger, and 4 is a pressure reducing device, which are connected in a ring to form a refrigerant circulation circuit.

Next, the outline of the control circuit will be explained with reference to FIG.

In the figure, 6 and 7 are indoor and outdoor blowers, and 8 is a compressor motor, which are connected to a power source 5 via electromagnetic switches 6 a, 7 a, and 8 a. 6a of each electromagnetic switch
, 7a, and 8a are controlled by a microcomputer 9.

Next, the indoor temperature control state will be explained with reference to FIGS. 3 to 7.

In FIGS. 4, 6, and 7, 11/~t7' indicate the compressor stop times from the first to seventh times, and from t1 to
t6 indicates the operating time of the compressor for the first to sixth times, respectively. The indoor temperature changes depending on whether the compressor is running or stopping.

Note that Figures 4 and 5 show changes in the indoor temperature, compressor operation, and stoppage of this example under normal load, Figure 7 shows changes in compressor operation and stoppage under normal load, and Figures 3 and 6 show changes in Figure 4, respectively. FIG. 5 and FIG. 7 show changes in indoor temperature, compressor operation, and shutdown under conventional control.

The operation and stop control method of the compressor is as follows.

The stop time is always constant, and the n-th operation time is basically constant, but if the indoor temperature reaches the thermo-on point during the n-th stop, the operation time is lengthened, and the operation time is increased during the n-1st operation. When the indoor temperature reaches the thermo-off point, the operating time will be shortened.

That is, after the time t1' preset by the microcomputer 9 has elapsed, the electromagnetic switch 8a closes and the compressor operates for the preset time t1.

Then, the electromagnetic switch 8a opens and the compressor stops for a period of t2'. In the same way, the compressor is started and stopped one after another.

When the indoor temperature reaches the thermo-on point during the previous operation, the microcomputer 9 causes the operating time to be lengthened, and when the indoor temperature reaches the thermo-off point during the previous stop, the microcomputer 9- shortens the operating time.

Next, in FIG. 2, the stop times 11' to t7' are the same, and the operating times t1 to t4. Although t6 is the same, the fifth operation time t5 is longer than t1 to 14.16 because the indoor temperature has reached the thermo-off point during the fifth stop time.

In FIG. 3, the stop times 11' to 16' are the same, and the operating times t1. Although t3 to t6 are repeated, the second operation time t2 is shorter than 11.13 to 70 because the indoor temperature has reached the thermo-off point during the first operation time.

By using the above control method, the stop time can be reduced compared to conventional temperature control V.
By setting the stop time shorter than the required stop time, it is possible to suppress the change in indoor temperature when the compressor starts and stops, and from stopping to running, to less than the differential between the thermo ON and OFF points, allowing fine control of the indoor temperature. Become.

Also, when the load is light, with conventional temperature control, the compressor stops for a long time, which causes humidity to rise, but with this control method, the compressor can be stopped before the thermo-on point is reached. Because it is operated, there is also the advantage that the humidity is low.

Effects of the Invention As described above, the present invention keeps the stop time constant, increases the operating time when the indoor temperature reaches the thermo-on point during the previous compressor stop, and changes the operating time from the previous compressor. When the indoor temperature reaches the thermo-off point during operation, the operating time is shortened and the stop time is set sufficiently short.
It is possible to suppress the differential between the thermo ON point and the thermo OFF point to less than the differential value, resulting in the effect of fine-grained temperature and humidity control.

[Brief explanation of the drawing]

Figure 1 is a refrigeration cycle diagram of an air conditioner according to an embodiment of the present invention, Figure 2 is a schematic electrical circuit diagram of the air conditioner, and Figure 3 is a diagram of the room temperature and compressor under conventional control under normal load. FIGS. 4 and 5 are explanatory diagrams showing temporal changes in the room temperature and compressor under normal load according to the temperature control method of the present invention, and FIG. 6 is an explanatory diagram showing temporal changes in the temperature control method of the present invention. FIG. 7 is an explanatory diagram showing temporal changes in the room temperature and the compressor under light load according to the temperature control method of the present invention. FIG. 6... Indoor blower, 7... Outdoor blower, 810009. Compressor motor, 6a, 7a, 8a
,,,,,,electromagnetic switch. Figure 1 @ Figure 2 Figure 3 Time Figure 4 Opening

Claims (1)

[Claims] It is equipped with a temperature control device that uses a temperature sensor to operate and stop the compressor to adjust the indoor temperature, and this temperature control device always makes the compressor stop time constant, and also sets the operating time to a constant value in advance. If the indoor temperature reaches the thermo-off point during the previous compressor stop, the compressor operating time will be lengthened, and if the indoor temperature reaches the thermo-off point during the previous compressor operation, the compressor operating time will be shortened. A method for controlling the temperature of an air conditioner.