JPS6025698B2 - Humidity control method for air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a humidity control method in a heat pump type air conditioner, which aims to prevent excessive dryness due to the excessive effect of dehumidifying operation especially during sleeping, and to achieve optimal air conditioning. This is one of the purposes.

BACKGROUND ART Conventionally, humidity control during sleeping in an air conditioner has been carried out by controlling the operation of the compressor using a timer or the like.

As a result, dehumidification is performed continuously, resulting in excessive dehumidification resulting in excessive dryness, which has the disadvantage of being uncomfortable, such as a dry throat. The present invention eliminates the disadvantages found in the above-mentioned conventional humidity control methods.

Hereinafter, the present invention will be described with reference to the accompanying drawings showing one embodiment thereof.

First, a refrigeration cycle for dehumidifying will be explained with reference to FIG.

In the figure, 31 is a compressor, 32 is an outdoor heat exchanger,
Reference numeral 33 denotes an indoor heat exchanger, which is comprised of a sub-condenser 33a that performs a heating action during dehumidification, and an evaporator 33b that performs a cooling action during both cooling and dehumidification.

34 and 35 are capillary tubes provided between the outdoor heat exchanger 32 and the indoor heat exchanger 33; 36 and 37;
are valve bodies each consisting of an auxiliary capillary tube and an on-off valve or a one-way valve, which are connected in parallel between the sub-condenser 33a and the evaporator 33b.

Reference numeral 38 denotes an injection cooling pipe, which throttles the cold soot at an intermediate pressure between both capillary tubes 34 and 35 and cools the cold soot on the high pressure side of the compressor 31 through a pipe 39, thereby increasing the compression efficiency. 40 is both the capillary tubes 34 and 35
This is an on-off valve that bypasses the dehumidification, and is opened during dehumidification operation.

41 is an outdoor fan whose speed can be changed.

In the above configuration, the flow of the medium during cooling is controlled by the on-off valve 40.
is closed and the valve body 37 serves as a barrier, so that the air flows through the compressor 31, the outdoor heat exchanger 32, the capillary tubes 34 and 35, and the indoor heat exchanger 33 as shown by the solid arrow.

In addition, the flow of cold soot during dehumidification is caused by the ugly opening/closing valve 40 and the valve body 37.
Since the compressor 31 is closed, the compressor 31 is closed as shown by the dashed arrow.
, outdoor heat exchanger 32, on-off valve 40, sub-condenser 33a,
The capillary tube 36 and the evaporator 33b flow with the compressor 31, and dehumidification is performed by the heating action of the sub-condenser 33a and the cooling action of the evaporator 33b.

The dehumidification or cooling capacity is controlled by controlling the rotation speed of the outdoor fan 41. Next, a control circuit that achieves the operation described in FIG. 1 will be described with reference to FIG. 3. In the figure, reference numeral 1 denotes a remote control unit (hereinafter referred to as the remote control), which includes a variable resistor 2 that adjusts the set temperature of the room temperature thermostat, and switches 4 and 5 that change the rotation speed of the indoor fan motor. 6 and a sleep switch 7 for operation at bedtime (heating-like dehumidification operation to raise the room temperature), and each of the switches 4, 5, and 6.
, 7 to generate the frequencies shown in FIG. 5, which are recognized by the microcomputer 8 on the main body side.

That is, the microcomputer 8 judges the frequency shown in FIG. Control.

FIG. 4 shows a circuit that switches the rotation speed of the fan motor 1 according to a signal output from the microcomputer 8, and R, , R2, and R3 are respectively provided in the control circuit 9 or paired with a relay coil (not shown). It is a relay contact. Further, the output D port of the microcomputer 8 on the main body side is provided with an output structure that produces a staircase waveform as shown in FIG. That is, scan resistors 8, 9, 10, 11,
12, 13, and 14 are connected, and a signal controlled within the microcomputer 8 is output to one of these scan resistors to produce a waveform shown in FIG. 6, which is input to the comparator 13.

A thermistor 15 measures the indoor suction temperature, and is input to one side of the comparator 13.

That is, the staircase waveform shown in FIG. 6 is scanned at a certain period and is input to the comparator 13. Then, the scan signal and the signal from the thermistor 15 are compared by the comparator 13, and the microcomputer 8 determines the position of the staircase waveform. Then, the signal from the comparator 13 is input again to the microcomputer 8 side, and the above-mentioned level is compared and calculated, and the signal is outputted from the microcomputer 8 so that the control shown in FIG.
The fan motor 11 and the compressor 12 are controlled through the controller.

The rotation speed of the indoor fan motor 1 is controlled by the control circuit 9.
As shown in FIG. 4, the switching operation is performed by switching the relay contacts R, -R3, which are paired with a relay coil (not shown) of the control circuit 9.

The rotational speed of the outdoor fan motor 41 is controlled by a switching means similar to that shown in FIG. 4 using an output port from a counter section built into the microcomputer 8.

Furthermore, by changing the rotational speed of the outdoor fan motor 41, dehumidification with a cooling effect, dehumidification with a heating effect, and intermediate dehumidification can be performed. In the above configuration, the operation when performing "sleep driving" will be explained.

For convenience of explanation, a case will be described in which the "sleep operation" is started while the dehumidifying operation is being performed while heating is being performed. First, when the sleep switch 7 is turned on, the sleep pulse (frequency) shown in FIG. A program is activated to increase the set humidity by t°C every time T minutes pass. The details will be explained based on FIG. 1.

The initial indoor temperature when "Sleep Driving" was started is
The temperature is maintained at the preset temperature before starting "Sleep Operation". The means includes a temperature signal detected by the thermistor 15,
This is done by comparing scan signals from the microcomputer 8 with a comparator 13, detecting whether the indoor temperature has reached a set temperature, and controlling the operation of the compressor 31 intermittently.
That is, as shown in FIG. 2, the comparator 13 compares the temperature detected by the thermistor 15 and the indoor target temperature stored in the microcomputer 8, and if the output of the comparator 13 is "low," then The output is input to the microcomputer 8, and the control circuit 10 is operated by the output from the microcomputer 8 to operate the compressor 12. Conversely, if the output of the comparator 13 is "high one", the compressor 12 is activated in the same way. It will be stopped.

Then, after a predetermined time m, minutes have elapsed, the indoor target temperature becomes an excess of the initial set temperature plus t, °C.

Therefore, as described above, the compressor 31 is operated when the room temperature drops to the ON point. As a result, the room temperature rises and O
Dehumidification continues until the FF point is reached. Furthermore, the room temperature is O
When the FF point is reached, the compressor 31 is stopped and dehumidification is interrupted. Thereafter, by repeating this process, the room temperature is maintained at the indoor target temperature (set value).

Furthermore, when the predetermined period of time T, minutes has elapsed during "Sleep Driving",
The indoor target temperature is further incremented by t.degree. C., and is set to be higher than the set temperature before starting the "sleep operation" by 1.degree. C., and the room temperature is maintained by intermittent operation control of the compressor 31 as described above.

Next, changes in humidity due to such control will be explained with reference to FIG. 1.

Before starting the "sleep operation", the humidity decreases when the compressor 31 is in operation and increases while the compressor 31 is stopped.

By repeating this process, the humidity is maintained within a nearly constant range. Then, when the "sleep driving" starts, the indoor target temperature does not change for the first predetermined time m, minutes, so the change in humidity remains the same as described above.

Furthermore, when the predetermined time m, elapses, the indoor target temperature decreases to ℃
and the room temperature is maintained at a correspondingly increased value.
Generally, the humidity increases significantly when the room temperature rises, but in this example, when the temperature rises, when the humidity tends to rise, the dehumidifying operation is performed at a heating level to suppress the humidity rise. As mentioned above, it is kept within a nearly constant range. Thereafter, even after the predetermined time T and minutes have elapsed, the humidity is controlled in the same manner.

Therefore, such control prevents excessive dehumidification due to continuous operation of the conventional compressor during sleep, and eliminates unpleasant sensations such as dry throat.

In addition, comfort is improved because the increase in humidity is suppressed especially when the room temperature rises, when humidity tends to increase. As is clear from the above embodiments, the humidity control method for an air conditioner of the present invention performs a dehumidifying operation with a slight heating effect, sets the indoor target temperature in a stepwise manner that increases by a predetermined temperature as a predetermined time elapses, and adapts to this characteristic. The compressor operates intermittently, and dehumidifies until the indoor temperature reaches the set temperature, and then dehumidifies intermittently to maintain the set temperature, making it possible to maintain a comfortable indoor temperature. Appropriate dehumidification can be performed.

In addition, by dehumidifying when humidity rises, the absolute humidity decreases and the temperature feels lower than the actual temperature, so the temperature change due to turning the compressor on and off feels smaller, improving comfort. It also has

[Brief explanation of the drawing]

FIG. 1 is a time chart showing the compressor operating state, indoor target temperature, and humidity change states according to the humidity control method for an air conditioner according to an embodiment of the present invention, and FIG. 2 is a time chart showing changes in the humidity control method for an air conditioner. Cycle diagram, Figure 3 is a control circuit diagram for performing the same humidity control, Figure 4 is a control circuit diagram of the indoor fan motor section in the same control method, and Figure 5 is a signal waveform input to the microcomputer in the same control method. 6 are signal waveform diagrams input to the comparator in the same control method. 8...Microcomputer (control unit), 13...
Comparator (comparison control unit), 15... Thermistor (temperature detector), 31... Compressor, 32...
...Outdoor heat exchanger, 33...Indoor heat exchanger, 34,35...Capillary valve. Figure 1 Figure 2 Figure 4 Figure 5 Figure 6 Ship

Claims (1)

[Claims] 1 A compressor, an outdoor heat exchanger, a capillary tube, and an indoor heat exchanger are sequentially connected in an annular manner to constitute a refrigeration cycle, and the indoor heat exchanger is composed of a sub-condenser and an evaporator, and A control device that detects indoor temperature and controls the operation of the compressor is provided, and this control device is combined with a control unit that stores an indoor target temperature that increases by a predetermined temperature step over a predetermined period of time; A comparison control unit that compares the temperature detected by the temperature detector with the indoor target temperature and stops the operation of the compressor when the detected temperature reaches the indoor target temperature, A humidity control method for an air conditioner, wherein the indoor temperature is raised in line with an indoor target temperature by intermittent operation of the compressor during dehumidification operation.