JPS60144549A - Method of controlling defrosting operation of air conditioner - Google Patents

Abstract

PURPOSE:To perform a dehumidifying operation without almost lowering the room temperature by stopping the operation of an indoor blower after the cooling mode operation to form frost on an indoor heat exchanger, and thereafter removing the moisture from the inside of room as drain water by the heating mode operation and exhaustion of air. CONSTITUTION:A cooling mode operation is first carried out, and after the lapse of a certain set time, the indoor blower is stopped to operate so as to form frost on the indoor heat exchanger. At the same time, the temperature of the indoor heat exchanger is detected. Then, the detected temperature of the indoor heat exchanger is compared with a set temperature T1 in a comparison circuit to discriminate whether or not the detected temperature corresponds to a frosting temperature. In this case, the detected temperature becomes less than the set temperature T1, a four-way valve is switched to the heating cycle and the exhausting device is operated, and indoor air passes through the heat exchanger and exhausted out of the room. Upon this occasion, frost formed on the indoor heat exchanger is molten by a coolant of high temperature and high pressure, and is converted into drain, water and steam, which are exhausted out of the room.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for controlling the dehumidifying operation of an air conditioner.

Conventional configuration and its problems A general air conditioner basically consists of a compressor, condenser, pressure reducing device, and evaporator. During cooling operation, the evaporator is located inside the room, cooling and dehumidifying at the same time. conduct. However, if the room is cold and humid and uncomfortable, running the air conditioner will dehumidify the room, but at the same time it will also cool the room, causing discomfort due to excessive cooling. Therefore, in such cases, a refrigeration cycle is required to significantly lower the humidity while keeping the room temperature as low as possible.

Conventionally, as shown in FIG. 1, an example of a refrigeration cycle capable of dehumidifying operation of this type includes a compressor & condenser, a first pressure reducer C9, a first heat exchanger d, a second pressure reducer e, The second heat exchanger f was directly connected in order, and the first two-way valve g was connected in parallel with the first pressure reducer C, and the second two-way valve was connected in parallel with the second pressure reducer e. There is a refrigerant circuit.

During normal cooling operation, the first two-way valve g is closed.
The second two-way valve opens, and the refrigerant is transferred from the compressor a3 to the condenser, the first pressure reducer C2, the tenth heat exchanger d, the second two-way valve, and the second heat exchanger. A refrigeration cycle is formed in which the first heat exchanger d and the twentieth heat exchanger f both function as an evaporator.

Also, during dehumidification operation, the first two-way valve g opens and the second two-way valve g opens.
With the two-way valve closed, the refrigerant flows in this order from the compressor a, the condenser, the first two-way valve g, the first heat exchanger d, and the second pressure reducer f. A refrigeration cycle is formed in which f acts as a sub-condenser and the second heat exchanger f acts as an evaporator. Then, the indoor air that has been cooled and dehumidified by the second heat exchanger f passes through the first heat exchanger d, through which a high-temperature, high-pressure refrigerant flows, and before passing through the second heat exchanger f. can be heated up to a temperature of

In this way, the conventional refrigeration cycle requires an extra pressure reducer and two two-way valves compared to the well-known air conditioner for cooling and heating, making the structure complex9 and reducing the number of parts. This has disadvantages such as a significant increase in manufacturing costs.

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks of the conventional example, it is an object of the present invention to reduce the number of parts, simplify the structure, and avoid lowering the temperature of the room while dehumidifying.

Composition of the invention In order to achieve the above object, the present invention provides a compressor.

A heat pump refrigeration cycle is constructed by sequentially connecting a four-way valve, an outdoor heat exchanger, a pressure reducer, and an indoor heat converter in an annular manner.
An integrated air conditioner equipped with an exhaust device that exhausts indoor air to the outdoor side includes a temperature detection device that detects the temperature of the indoor heat exchanger, a timer that controls the operating time of the indoor blower, and the temperature. A temperature comparison circuit is provided to compare the temperature detected by the detection device with a set temperature, and a relay is provided for operating and stopping the four-way valve, the indoor blower, and the exhaust device based on a signal from the comparison circuit.

DESCRIPTION OF EMBODIMENTS Hereinafter, the present invention will be described with reference to FIGS.
This will be explained with reference to FIG.

Figure 2 is a refrigeration cycle diagram, with a compressor of 1°51"
Di four-way valve 2. Outdoor heat exchanger 3. Pressure reducer4. The indoor heat exchangers 6 are connected in a ring. 6 is an outdoor side blower, and 7 is an outdoor side blower. During heating operation, the refrigerant flows in the direction of the solid line arrow, and during cooling operation, the refrigerant flows in the direction of the broken line arrow.

FIG. 3 is a structural diagram of the integrated air conditioner, and 8 is an exhaust device.

When exhausting air, the outdoor side blower 6 is operated, and the exhaust door of the exhaust device is opened to allow air to flow in the direction of the arrow and be exhausted.

Figure 4 shows the elapsed time t after stopping the indoor fan during cooling operation, the indoor heat exchanger temperature T, and the amount of frost on the indoor heat exchanger M.
This shows the general characteristics of

When the indoor fan is stopped during cooling operation, the evaporation pressure of the indoor heat exchanger decreases, and when the temperature drops below O'C, the heat exchanger begins to frost. And T.

When the temperature drops to , most heat exchangers become clogged due to frost formation. After that, even if the temperature drops further, the amount of frost will increase gradually.

Figure 6 also shows the elapsed time and the temperature T of the indoor heat exchanger when heating is started after the indoor heat exchanger has been completely frosted.
It is a diagram showing the relationship between the amount of moisture adhering to the indoor heat exchanger and the amount of water adhering to the indoor heat exchanger. When heating is performed, high-temperature, high-pressure refrigerant flows through the indoor heat exchanger, melting the frost that has formed. After completely melting, the heat exchanger temperature rises rapidly. Therefore, when the temperature of the indoor heat exchanger is T2, which is higher than O'C, the frost has completely melted and the amount of moisture adhering to the heat exchanger is extremely small.

FIG. 6 shows the signal flow for dehumidifying operation.

At first, cooling operation is performed. Then, when a certain set time has elapsed, the indoor fan is stopped, the indoor heat exchanger is frosted, and the temperature of the indoor heat exchanger is detected.The detected temperature is compared with the set temperature T1 by a comparison circuit, and the frosting temperature is determined. Determine whether or not. When the temperature falls below the set temperature T1, the four-way valve is switched to the heating cycle, and the exhaust system is operated to exhaust indoor air to the outside through the indoor exchanger. At this time, the frost that had formed on the indoor heat exchanger was removed by the high temperature and high pressure refrigerant.
Vegetables are melted and become drain water and steam. This high-humidity steam is exhausted outside by an exhaust device. When the frost is completely melted, the temperature of the indoor heat exchanger rises and reaches the set temperature T2 or higher, the four-way valve is switched again, the exhaust device is stopped (the exhaust door is closed), and the indoor fan is operated to start cooling operation. to improve air convection inside the room. Then repeat the above steps again.

The above control can be realized by a circuit equipped with a microcomputer.

Receive the microcomputer signal, judge the temperature, and receive the +)v9 signal.

Effects of the Invention As is clear from the above embodiments, the present invention performs a cooling operation for a set time, then stops the indoor blower, frosts the indoor heat exchanger, and then performs a heating operation and exhausts the air to reduce humidity by draining water or steam. Since this is a dehumidification operation control method that removes moisture from the room, it can dehumidify without lowering the room temperature. Furthermore, since it uses conventional components, it does not require special parts for dehumidification, so it has advantages such as simple structure and low cost. It has the following effects.

[Brief explanation of drawings]

Figure 1 is a diagram of a conventional refrigeration cycle that can be operated with dehumidification.
Fig. 2 is a refrigeration cycle diagram of an air conditioner showing one embodiment of the present invention, Fig. 3 is a structural diagram of the air conditioner, Figs.
Each figure is a characteristic diagram showing the relationship between the heat exchanger temperature and the amount of frost formed on the heat exchanger or the amount of moisture attached to the heat exchanger over time. The flowchart, FIG. 7, is a control block diagram for performing the same dehumidifying operation. 1... Compressor, 2... Four-way valve, 3...
... Indoor heat exchanger, 4 ... Pressure reducer, 5.
...Indoor heat exchanger, 7...Indoor blower, 8...Exhaust device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
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Claims (1)

[Claims] A heat pump refrigeration cycle is constructed by sequentially connecting a compressor, four-way valve, outdoor heat exchanger, pressure reducer, and indoor heat exchanger in a ring, and is equipped with an exhaust device to exhaust indoor air to the outdoor side. The air conditioner includes a temperature detection device that detects the temperature of the indoor heat exchanger, a timer that controls the operating time of the indoor blower, and a degree comparison circuit that detects the temperature detected by the temperature detection device. In response to the signal, a relay, etc. for switching the four-way valve, operating and stopping the exhaust system, and stopping the indoor fan, etc. is activated, and the humidity inside the room is lowered by drain water and air exhausted to the outside. Dehumidification operation control method for a conditioner.