JPS6349140B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a temperature and humidity control device for an air conditioner equipped with a refrigeration cycle.

In recent years, there has been a global trend toward energy conservation, and naturally air conditioners are also becoming energy efficient. When talking about this energy saving, EER (Energy Effective Ratio) is used as a guideline for air conditioners.
There is a strong need to develop large air conditioners.

Therefore, in view of the above-mentioned energy saving, the present invention provides a refrigeration cycle with good operational efficiency, mainly by changing the amount of pressure reduction during capacity control operation.

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

In FIG. 1, the refrigerant circuit during standard cooling operation is composed of a compressor 1, a condenser 2, an electromagnetic two-way valve 3, a first capillary tube 4, an evaporator 5, and a compressor 1. At this time, high-pressure liquid refrigerant flows through the electromagnetic three-way valve 6 from direction a to b, and the capacity adjustment valve 7 is closed.

Next, two types of refrigerant circuits can be considered for the refrigerant circuit during capacity control operation depending on the open/closed state of the electromagnetic two-way valve 3.
The first circuit is a refrigerant circuit consisting of a compressor 1, a condenser 2, an electromagnetic two-way valve 3, a first capillary tube 4, an evaporator 5, and a compressor 1 when the two-way solenoid valve 3 is open. Yes, the second circuit is when the electromagnetic two-way valve 3 is closed, and the compressor 1, condenser 2, second capillary tube 8, first capillary tube 4, evaporator 5,
This is a refrigerant circuit consisting of a compressor 1, and refrigerant flows through an electromagnetic three-way valve 6 in the direction from b to c in both the first and second circuits.

Next, the temperature and humidity control circuit will be explained with reference to FIGS. 2 and 3. Figure 2 shows the outdoor blower 9, indoor blower 10, solenoid two-way valve 3, and solenoid 3 shown in Figure 1.
6 is an electric circuit diagram for controlling the direction valve 6. FIG.

In the figure, 11 is an AC power source, and 12 is a transformer for sending a low voltage to an electronic control unit 13 that controls the shutdown of the main compressor 1. 14a is a contact point of the electromagnetic switch 14 included in the electronic control device 13, which also controls the compressor 1, the outdoor blower 9, and the indoor blower 10. 15 is a capacity control operation switch (in the figure, it is in full capacity operation).
By switching between the electromagnetic two-way valve 3 and the electromagnetic three-way valve 6, capacity control operation and full capacity operation are performed. 1
Reference numeral 6 denotes a re-evaporation prevention operation switch that switches the indoor blower 10 to operation or stop only when the compressor 1 stops; in this figure, the re-evaporation prevention operation is in the "off" state. Reference numerals 17 and 17a designate electromagnetic switches that close and open the electromagnetic two-way valve 3 only during capacity control operation by turning the re-evaporation prevention operation switch 16 on and off.

Next, with reference to FIG. 3, the electronic control device 13 which mainly controls the operation/stop of the compressor 1 in the function of the temperature/humidity control circuit shown in FIG. 2 will be explained.

In the same figure, R1 is a temperature-sensitive resistance element such as a thermistor that detects the cooling load, and is installed to detect the suction temperature of the evaporator 5, and this temperature-sensitive resistance element R1 is connected to a temperature control volume R2 and a resistor R3.
connected in series with a series circuit consisting of 18
is a comparator, and input terminal + is connected to temperature-sensitive resistance element R.
1 and the temperature adjustment volume R2,
The reference terminal - is connected to the middle of the series circuit of resistors R4 and R5. Further, the output terminal of the comparator 18 is connected to the base terminal of the transistor Q1 via a diode D2. Reference numeral 14 denotes a relay coil connected to the collector terminal of the transistor Q1, which controls the operation of the compressor 1 by opening and closing a commonly used reloo contact 14a shown in FIG. Vcc is a DC power supply, R6, R7, R8 are resistors, D1, D
3 is a diode.

In the above configuration, when the input voltage V ₊ is higher than the reference voltage V _- , the comparator 18 detects the transistor Q1.
Turns ON, and turns OFF in the opposite case. Then,
By turning ON and OFF the transistor Q1, the relay 14 is turned ON and OFF, and the compressor 1 is controlled to operate and stop.

The configuration of the temperature and humidity control circuit has been explained above in Figures 1 to 3, and Figures 4 and 5 show operation mode diagrams when capacity control operation is performed based on this configuration. Figure 6 shows the relationship between relative humidity and EER (Energy Effective Ratio).

FIG. 4 shows the capacity control operation in FIG. 2 when the switch 15 is set to the capacity control operation side, and
This is the operation mode when the re-evaporation prevention operation switch 16 is turned off. In this case, the solenoid two-way valve 3
Since the first capillary tube 4 is the only aperture that opens, the amount of aperture is small. In addition, since the indoor blower 10 is operating even when the compressor 1 is stopped,
The water droplets attached to the evaporator 5 evaporate, and the relative humidity in the room increases to 60 to 70%. However, indoor blower 10
There is an airflow, so there is no discomfort.
The solid line in the right half of FIG. 6 shows the relationship between relative humidity and EER at this time.

In FIG. 5, the capacity control operation switch 15 in FIG. 2 is set to the same capacity control operation side as in the case of FIG.
This is the driving mode when set to . In this case,
Since the electromagnetic two-way valve 3 is closed, the amount of restriction is large because the first capillary tube 4 and the second capillary tube 8 are connected in series, and the indoor blower 10 is closed while the compressor 1 is stopped. Since the evaporator 5 is not operated, there is almost no re-evaporation of water droplets from the evaporator 5, and therefore, the relative humidity in the room can be as low as 50 to 60%. The solid line in the left half of FIG. 6 shows the relationship between relative humidity and EER at this time.

As is clear from the above embodiments, the temperature and humidity control device for an air conditioner according to the present invention is capable of controlling whether the indoor blower is started or stopped while the control means for operating and stopping the heat exchanger is stopped based on the signal from the comparison detection means. means for detecting whether the indoor blower is in the operating state, and means for controlling the pressure reduction amount of the refrigeration cycle pressure reducing device to be smaller when the indoor blower is in the operating state than when it is in the stopped state based on the means. Therefore, the indoor relative humidity is determined by whether the indoor fan is operated or stopped, and by mainly changing the throttle amount during capacity control operation, the operation is performed at the optimal energy effective ratio, thereby saving energy. The transformation of
It has various advantages for the user, such as being able to select between giving priority to airflow or relative humidity, and obtaining control effects with a wide range of functions.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration cycle diagram of an air conditioner equipped with a temperature/humidity control device according to an embodiment of the present invention, Fig. 2 is an electrical system diagram of the temperature/humidity control device, and Fig. 3 is a diagram of the temperature/humidity control device. Electrical circuit diagrams, Figures 4 and 5 are operation mode diagrams when the indoor blower is stopped or running when the compressor is stopped by the same temperature and humidity control device, and Figure 6 is the operation mode shown in Figures 4 and 5. It is a relative humidity change versus EEF characteristic diagram depending on the mode. R1... Temperature sensitive resistance element (temperature detector), 1...
Compressor (heat exchange device), 4, 8...Capillary reach tube (pressure reducing device), 10...Indoor blower, 1
8... Comparator (control device).

Claims (1)

[Claims] 1. Temperature detection means for detecting the load temperature state, comparison detection means for comparing and detecting the temperature detection means and the setting means, control means for operating and stopping the heat exchange device according to the signal of the comparison detection means, and the comparison detection means. means for detecting whether the indoor blower is running or stopped while the control means is stopped, the indoor blower being operated independently of the signal; and the indoor blower being operated based on the means; A temperature/humidity control device for an air conditioner, which is provided with a means for controlling the pressure reduction amount of a pressure reducing device of a refrigeration cycle to be smaller when the refrigeration cycle is in the stopped state than when the refrigeration cycle is in the stopped state.