JPS5950901B2 - air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner that enables dehumidifying operation with a novel configuration.

One of the conventional air conditioners capable of cooling and dehumidifying operation is to divide the indoor heat exchanger into two parts, and use one or both of them to act as an evaporator during cooling operation, and use a blower to exchange heat with indoor air to control the conditioned air. The room air (hereinafter referred to as indoor air) is cooled.

During dehumidification operation, one is used as an evaporator and the other as a condenser, and indoor air that has been cooled and dehumidified is reheated so that dehumidification operation can be performed without lowering the indoor air temperature.

However, such air conditioners have complicated refrigerant circuits, require a large number of solenoid valves, and have complex control circuits, making them more difficult to manufacture and more expensive than air conditioners dedicated to cooling. was.

In addition, when cooling and dehumidifying operations are repeated alternately, the startup of the cooling operation becomes slow due to residual heat from the indoor heat exchanger that serves as a condenser, and the attached moisture is heated and evaporates, hindering the dehumidifying effect. It had

Instead of dividing the indoor heat exchanger into two, an auxiliary electric heater is attached to the indoor heat exchanger, and during dehumidification operation, the auxiliary electric heater is energized to reheat the cooled and dehumidified indoor air. There is also a device, but it has the disadvantage of high operating costs, and like the above-mentioned device, when the cooling-dehumidifying operation is repeated, residual heat of the heater and moisture adhering to the heater make the start-up of the cooling operation slow, and the dehumidifying effect is reduced. There was a hindrance.

The present invention has been made in view of the above-mentioned facts, and an object of the present invention is to provide an air conditioner capable of cooling and dehumidifying operation without requiring a complicated refrigerant circuit and with low operating costs.

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows a refrigerant circuit 1 of the present device, in which a compressor 2, an outdoor heat exchanger 3, a pressure reducing device 4, and an indoor heat exchanger 5 are installed in series.

6 is an indoor fan that promotes heat exchange between the indoor heat exchanger 5 and indoor air, and 7 is an outdoor fan that promotes heat exchange between the outdoor heat exchanger 3 and outdoor air.

FIG. 2 shows the control device of this device, in which 8 is an AC power source, 9 is a blower switch connected to one end of the AC power source 8, and 10 and 11 are connected in series between the blower switch 9 and the other end of the AC power source 8. 12 is a running switch connected in series with the blower switch 9; 13 and 14 are double-throw contacts connected in series with the running switch 12; 15 and 16 are outdoor blower motors connected in parallel between the high temperature side contact H of the room temperature thermostat 13 and the connection point of the first dehumidification switch 14 and the other end of the AC power supply 8; and compressor motors 17 and 18 are a second dehumidifying switch and a timer motor that operate in conjunction with the first dehumidifying switch 14 connected in series between the low temperature side contact of the room temperature thermostat 13 and the other end of the AC power source 8. There is.

The timer motor 18 constitutes an intermittent operation control device 19 together with the time switch 10, and when energized, for example, the time switch 10 is closed for one minute, then opened for one minute, and this is repeated.

Now, the blower switch 9 and the operation switch 12 are closed,
It is assumed that the first and second dehumidification switches 14 and 17 are opened and cooling operation is commanded.

The indoor blower motor 11 is energized via the blow switch 9 and the time switch 10, and the indoor blower 6 performs the blow operation.

When the indoor temperature is higher than the set value of the room temperature thermostat 13, the outdoor blower motor 15 and the compressor motor 16 are energized via the high temperature side contact H of the room temperature thermostat 13, and the outdoor blower 7 is turned on.
and compressor 2 is operated.

Therefore, the high temperature and high pressure refrigerant discharged from the compressor 2 flows as shown by the solid arrow, is condensed in the outdoor heat exchanger 3, becomes low temperature and low pressure in the pressure reducing device 4, and evaporates in the indoor heat exchanger 5. After being vaporized, it returns to the compressor 2 and repeats this process.

Therefore, the indoor air circulated by the indoor blower 6 is cooled and dehumidified by the indoor heat exchanger 5 and then returned to the room, so that cooling operation is performed and the indoor temperature decreases.

When the indoor temperature falls to the set value of the room temperature thermostat 13, the room temperature thermostat 13 switches to the low temperature side contact, and the outdoor blower motor 15 and the compressor motor 16 stop operating. Only ventilation operation is performed.

At this time, the timer motor 18 is not energized because the second dehumidifying switch 17 is opened.

When the indoor temperature rises again, cooling operation resumes.
Since this is repeated, the indoor temperature is maintained near the set value of the room temperature thermostat 13.

If the above-mentioned cooling operation and ventilation operation are repeated when the humidity is high, the humidity may rise rapidly during the ventilation operation, which may cause discomfort.

Therefore, the first switch along with the ventilation switch 9 and the operation switch 12
, the second dehumidification switches 14 and 17 are closed.

At this time, the outdoor blower motor 15 and the compressor motor 16
is energized via the first dehumidifying switch 14 regardless of the room temperature thermostat 13.

When the indoor temperature is high, the timer motor 18 is not energized, so the indoor blower motor 11 continues to be energized.
Normal cooling operation is performed.

When the room temperature is lower than the set value of the room temperature thermostat 13, the room temperature thermostat 13 is connected to the low temperature side contact, and the timer motor 1 is activated.
8 is energized.

For this reason, the time switch 10 repeats closing-opening-closing at one-minute intervals based on the timer signal from the timer motor 18, and the indoor blower motor 11 is energized intermittently.

Therefore, since the indoor blower 6 performs air blowing operation intermittently at one-minute intervals, when the blower 6 is stopped, heat exchange is not performed in the indoor heat exchanger 5, and the heat exchanger temperature drops rapidly. When the air blower 6 is in operation, indoor air hits the indoor heat exchanger 5, which is in a low temperature state, and is dehumidified in large quantities, and this process is repeated thereafter.

This prevents the indoor temperature from decreasing due to the decrease in air volume, and dehumidifying operation is performed.

Then, when the indoor temperature rises, the room temperature thermostat 13 enters the high temperature side contact H, and the timer motor 18 is de-energized, so normal cooling operation is performed, and the indoor temperature is lowered to near the set value of the room temperature thermostat 13, and the blank humidity is decrease.

In this way, during the dehumidification operation command in which the first and second dehumidification switches 14 and 17 are closed, the indoor temperature reaches the room temperature thermometer 1.
When the temperature is higher than the set value of the room temperature thermometer 13, cooling operation is performed to lower the indoor temperature and indoor humidity, and when the indoor temperature is lower than the set value of the room temperature thermostat 13, the indoor fan 6 is operated intermittently to cool the indoor heat exchanger. The temperature of 5 is periodically lowered, and the amount of air blown into the room is reduced to prevent the indoor temperature from dropping. It is designed to reduce humidity, and when indoor humidity is high, humidity control is performed in accordance with the level of indoor temperature.

According to this device, the dehumidifying operation is performed by using the same refrigerant circuit 1 as used during cooling operation and intermittent control of the operation of the indoor fan 6. Therefore, unlike the conventional method, multiple indoor heat exchangers are used. Compared to a dehumidifying system in which one is divided into two parts and one is used as an evaporator and the other as a condenser, there is no need for a complicated refrigerant circuit or solenoid valve control, and the manufacturing cost is equivalent to that of a dedicated one for the mahjong room. Compared to a dehumidifying device with an auxiliary electric heater attached to the device, the operating cost is lower and the safety is higher.In fact, since the load is smaller, the operating current is lower than during cooling operation.

Further, since there is no need to reheat, there is no re-evaporation of moisture into the air when switching from cooling operation to dehumidification operation, and a good start-up is achieved when switching from dehumidification operation to cooling operation.

Furthermore, since the entire surface of the indoor heat exchanger 5 is used for dehumidifying operation, the dehumidifying efficiency is high.

Then, as in the present invention, when the dehumidifying operation is commanded, the cooling operation and the dehumidifying operation are selected according to the indoor temperature, so that appropriate indoor temperature and indoor humidity control can be performed in a wide range of indoor temperature ranges.

In addition, in the above-mentioned embodiment, the first and second dehumidification switches 14
, 17 may be replaced by a humidity switch that opens and closes by detecting the indoor humidity. If a multi-speed variable motor is used as the indoor blower motor 11, the indoor blower 6 is operated.
Instead of intermittent operation with stops, intermittent high-speed and low-speed operation may be performed.

Further, the intermittent operation control device 19 is not limited to the above-mentioned one, but can also be configured with an electronic timer circuit.

As described above, when the indoor temperature of the air-conditioned room becomes lower than the set value of the room temperature thermostat during dehumidification operation command, the blower of the indoor heat exchanger is switched from continuous operation to intermittent operation while operating the compressor. Since the temperature of the indoor heat exchanger is periodically lowered by switching to operation, it is possible to dehumidify the air-conditioned room while maintaining a comfortable temperature.

Furthermore, when the blower is in intermittent operation, the compressor is operated to evaporate the refrigerant in the indoor heat exchanger, so if the blower stops and heat exchange with the indoor air is no longer performed, the indoor heat exchange By significantly lowering the temperature of the chamber and removing a large amount of moisture from the air sent to the indoor heat exchanger during the next air blowing, and then periodically repeating the stopped state and the air blowing state, the humidity is reduced while suppressing the drop in room temperature. It can exhibit excellent dehumidification effect without return.

[Brief explanation of drawings]

FIG. 1 is a refrigerant circuit diagram showing an example of an air conditioner to which the present invention can be applied, and FIG. 2 is an electric circuit diagram of an air conditioner showing an embodiment of the present invention. 1... Refrigerant circuit, 2... Compressor, 3.
... Outdoor heat exchanger, 4 ... Pressure reduction device,
5...Indoor heat exchanger, 6...Indoor blower, 19...Intermittent operation control device.

Claims (1)

[Claims] 1. A compressor, an outdoor heat exchanger, a pressure reducing device, and an indoor heat exchanger are connected in series to form a refrigerant circuit, and a blower is used to exchange heat between the indoor heat exchanger that performs evaporation and the air in the conditioned room. If the indoor temperature of the air-conditioned room falls below the set value of the hoe temperature thermometer while dehumidifying operation is being commanded, the blower of the indoor heat exchanger will be turned off from continuous operation while the compressor is being operated. An air conditioner comprising an intermittent operation control device that periodically lowers the temperature of an indoor heat exchanger by switching to intermittent operation.