JPS608411B2 - air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to improvements in a dehumidifying operation method and a control method in an air conditioner capable of cooling and dehumidifying operations.

[Prior art]

Conventional dehumidification methods for air conditioners capable of dehumidifying operation, for example, in the case of a separate type, divide the heat exchanger built into the indoor unit into two, with the evaporator at the front of the circulating flow of indoor air. The common method is to use the rear part as part of the condenser, and the indoor air that has been cooled and reduced in temperature in the evaporator is reheated in the condenser and blown into the room in a dehumidified state. I was taken by it.

However, with this method, it is necessary to switch the cold soot circuit so that all the indoor heat exchangers function as evaporators, or separate functions into the evaporator and condenser as described above, and for this reason, it is necessary to switch the cold soot circuit so that the indoor heat exchanger functions as an evaporator separately. Compared to the previous model, the addition of electromagnetic switching valves, capillary tubes, etc. resulted in increased structural complexity and cost. [Summary of the Invention] In order to eliminate the above-mentioned drawbacks, the present invention provides an air conditioner that can perform both cooling and dehumidification operations, with the soot circuit remaining the same as that of the cooling-only type, and which can easily perform dehumidifying operation. It is.

The details of the present invention will be explained below. [Embodiment of the Invention] FIG. 5 is an overall configuration diagram showing an embodiment of an ordinary cooling-only air conditioner according to the present invention.

As is clear from FIG. 5, in this embodiment, a cold soot circuit is formed by a compressor 5, an evaporator 6, a condenser 7, and a pressure reducing device 8. It is provided with motors 4 and 6 that drive internal and external fans 10 and 11, and is provided with a room temperature detection thermosensing element 9 that detects the room temperature, and a room temperature detection device that receives a detection signal from the room temperature detection thermosensing element 09 as an input. A means 12 detects the indoor temperature at the start of operation, and a cut-off or cut-in temperature setting means 13 sets a cut-in or cut-off temperature based on the output. As a result, the output is output to the compressor 5 and the inner and outer fan motors 4 and 6 by means of the ON/OFF control rod 4 for the compressor or the inner and outer fan motors. FIG. 1 is an electrical circuit diagram of the above-mentioned embodiment, and 1 is a room temperature detection means 12 and a cut-off or power-in temperature setting means 13 shown in FIG. 5 above.
, ON/OFF control of compressor or internal/external fan motor 14
2 is a relay contact, 4 is an inner fan motor, 6 is an outer fan motor, and 5 is a compressor motor. FIG. 2 is a flowchart regarding control when performing dehumidification operation of the air conditioner of the present invention. The operation of the dehumidifying operation will be explained with reference to FIG. First, the room temperature T at the start of dehumidification operation
s is detected, measured and stored in step 121. Next, in steps 131 and 132, Ade and A-l are
The temperatures lower than degC are automatically set by the temperature control unit 1 as the cutoff temperature and the cutoff temperature, respectively. Next, if the room temperature Tr, 122 is higher than the cut-in temperature Ts-A+1, the process proceeds from step 133 to step 141, where the internal and external fan motors 3 and 4 and the compressor motor 5 are rotated in a high-speed rotation to perform a well-known cooling operation. By operating the room temperature Tr
If it becomes lower than the step 134 cutoff temperature Ts-A, the process proceeds to step 142 and all operations are stopped, but in step 114, the cutoff temperature Ts-A reaches room temperature Tr.
If the temperature is not lower than T, in step 135 the room temperature T
Determine whether r is rising or not; if NO, step 1
Returning to step 32, the internal and external fan motors 3 and 4 and the compressor motor 5 are operated to perform cooling operation. Then the cutting temperature T
The operation is stopped repeatedly so that the room temperature Tr is controlled between s-A+1 and the cutoff temperature Ts-A. At this time A
The value of degC is determined as shown in FIG. 3. That is, when the initial room temperature Ts is high, the value of A is set large, and when the room temperature Ts is low, the value of A is set small.

However, at this time, an upper limit value and a lower limit value are provided for the set value of the value of A. FIG. 4 shows the results of changes in room temperature humidity when the air conditioner of the present invention is operated under the control described above.

As shown in FIG.
) is controlled between On the other hand, humidity shows "decrease and increase" by repeating on and off, but
The humidity converges to a certain level and becomes almost stable. At this time, as shown in Figure 3, the value of A depends on the initial room temperature Ts, so if the room temperature Ts is high, the on time becomes longer and the off time becomes shorter, so the degree of humidity decrease In other words, when the room temperature is high, the temperature decreases, but the humidity also decreases, making the room more comfortable.Also, when the room temperature is low, the temperature decreases, but the humidity decreases. By lowering the temperature to an appropriate level, the feeling of being too cold can be suppressed.As described above, according to the present invention, the refrigerant cycle for dehumidifying operation does not have to be complicated and expensive, and the well-known simple cooling system can be used. By controlling the room temperature while using the refrigerant cycle, dehumidifying operation becomes possible.

Furthermore, by adjusting the initial temperature of the room temperature, it is possible to control the room temperature and humidity to keep them at optimum conditions. [Effects of the Invention] Therefore, according to the present invention, it is possible to provide an air conditioner for both cooling and dehumidification that is simpler and lower cost than the conventional air conditioner for both cooling and dehumidification. There's a lot to it.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram showing an embodiment of the air conditioner of the present invention, Fig. 2 is a flowchart of dehumidification operation control,
Figure 3 is an explanatory diagram of room temperature control during dehumidification operation, Figure 4
The figure is a characteristic diagram of room temperature and humidity during dehumidification operation, and FIG. 5 is an overall configuration diagram of an embodiment of the air conditioner of the present invention. In addition, 1 is a temperature control part, 12 is a room temperature detection means, 13 is a temperature setting means, and 14 is a compressor or an internal/external fan motor control means. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. A room temperature detection means for detecting the room temperature Ts at the time of starting operation and the room temperature Tr during operation, and two temperature levels that are lower than this temperature and different from the room temperature Ts at the time of starting operation, and are higher when the room temperature Ts is higher. cut-off temperature and cut-in temperature setting means that set the cut-off temperature and cut-in temperature higher when the room temperature Ts is low and within the range of a certain upper limit value and lower limit value, and a means for stopping the cooling operation so as to control the room temperature between these two temperatures 1. An air conditioner characterized in that the air conditioner is equipped with a control means for performing dehumidifying operation by stopping all fans and compressors when the air conditioner is stopped.