KR100424103B1 - Air-conditioner have a facility for protecting over cooling - Google Patents

Abstract

The present invention relates to an air conditioner having an anti-cooling function, wherein two heat exchangers are installed in an indoor unit, and expansion valves are installed at each input side of the heat exchanger to independently control expansion valves, thereby simultaneously cooling and heating in the heat exchanger of the indoor unit. Dehumidification without frequent on / off of the compressor can be prevented from overcooling the room can extend the life of the compressor as well as to prevent the overcooling of the room during cooling and dehumidification function performance.

Description

Air-conditioner with overcooling function {AIR-CONDITIONER HAVE A FACILITY FOR PROTECTING OVER COOLING}

The present invention relates to an air conditioner having an anti-cooling function, and more particularly, two heat exchangers are installed in an indoor unit, and expansion valves are installed at each input side of the heat exchanger to independently control the expansion valve to provide cooling and cooling in the heat exchanger of the indoor unit. The present invention relates to an air conditioner having an overcooling function to prevent the dehumidification function and the room from being overcooled by allowing heating to be performed at the same time.

In general, an air conditioner uses a cooling cycle to liquefy refrigerant gas compressed at a high temperature and high pressure in a compressor in a condenser, and changes a liquid refrigerant to a low temperature and a low pressure in an expansion valve, and then cools it by evaporation heat in an evaporator. By performing the, it is based on the air conditioning to maintain the temperature suitable for the activity by supplying cold air to the closed indoor space, such as the office, room or building interior in hot summer weather.

These air conditioners are classified into various types according to the function or the configuration of the unit. In the classification by functions, they can be classified into cooling only, cooling and dehumidifying only, and cooling and heating.

In addition, in the classification of the unit configuration, the air conditioner is divided into an integrated air conditioner installed in a window or the like by integrating cooling and heat dissipation functions, and a separate type air conditioner that separates and installs a cooling device in an indoor space and a heat dissipation and compression device in an outdoor space.

That is, according to the classification by the unit, the air conditioner is roughly divided into an integral type in which each component is built in a cabinet, a separate type consisting of an indoor unit having an evaporator and an outdoor unit having a compressor and a condenser.

The representative of the former is a window air conditioner, the latter is a wall-mounted and packaged air conditioner.

1 is a block diagram schematically showing a general air conditioner.

As shown here, the outdoor unit 10 includes a compressor 130 for compressing the refrigerant and an outdoor unit blower 120 for smoothly discharging the heat contained in the condenser 110 and the refrigerant from the refrigerant compressed by the compressor 130. ) Is installed on the roof of the building or outside the veranda due to noise and heat dissipation. In addition, the indoor unit 20 is an indoor unit blower for supplying the cool air generated when the refrigerant evaporated from the liquid state to the gas state while being sent to the evaporator 230 through the expansion valve 210 to the refrigerant sent from the condenser 110 ( 220) is installed inside the building to be cooled.

The air conditioner made as described above controls the operation of the compressor 130, the expansion valve 210, the outdoor unit blower 120, and the indoor unit blower 220 in the control unit 30 as power is applied to cool or dehumidify the interior of the building. Let's go.

However, when the air conditioner is operated and the cooling function reaches the desired temperature, the compressor is repeatedly turned on and off and kept at the desired temperature. There is a problem that shows a deviation.

In addition, when the dehumidification function is performed, if the indoor temperature is lowered, the compressor is turned off and the indoor unit blower is operated at a very slow speed, so that the effective dehumidification function is not performed and the room temperature is too low.

The present invention has been made to solve the above problems, an object of the present invention is to install two heat exchangers in the indoor unit and to install the expansion valve on each heat exchanger input side to control the expansion valve independently, the heat exchanger of the indoor unit In the cooling and heating at the same time made by the dehumidification function as well as the air conditioning having an anti-cooling function to prevent the room from being overcooled.

1 is a block diagram schematically showing a general air conditioner.

2 is a block diagram schematically showing an air conditioner having an anti-cooling function according to the present invention.

-Explanation of symbols for the main parts of the drawings-

10: outdoor unit 20: indoor unit

110: condenser 120: outdoor unit blower

130 compressor 210 expansion valve

220: indoor unit blower 230: evaporator

300: compressor 310: outdoor heat exchanger

320: first expansion valve 325: second expansion valve

330: first indoor heat exchanger 335: second indoor heat exchanger

340 control unit 350 indoor unit blower

The present invention for realizing the above object is an air conditioner performing air conditioning using the condensation heat and vaporization heat of the refrigerant by the cooling cycle by measuring the indoor and outdoor temperature, the compressor for compressing the refrigerant to a high temperature and high pressure, by a compressor An outdoor heat exchanger for releasing and liquefying heat contained in the compressed refrigerant, a first expansion valve for lowering or bypassing the refrigerant sent from the outdoor heat exchanger according to the opening degree, and a refrigerant output through the first expansion valve And a first indoor heat exchanger performing heat exchange with a second expansion valve for making or bypassing the refrigerant output from the first indoor heat exchanger in a low pressure state according to the opening degree, and the refrigerant output through the second expansion valve. And a second indoor heat exchanger for carrying out the air flow to the compressor and for controlling the operation of the compressor and the degree of opening of the first to second expansion valves. Characterized in that made in comprising: a.

The present invention made as described above by adjusting the opening degree of the first expansion valve and the second expansion valve according to the temperature of the room so that both the evaporation and condensation action occurs in the first indoor heat exchanger and the second indoor heat exchanger. By simultaneously dissipating it is possible to perform the cooling and dehumidification function while preventing the overcooling of the room while the compressor continues to operate normally.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In addition, this embodiment is not intended to limit the scope of the present invention, but is presented by way of example only.

2 is a block diagram schematically showing an air conditioner having an anti-cooling function according to the present invention.

As shown here, a part of the cooling cycle of the air conditioner was changed so that the heat of condensation and the evaporation of heat could be simultaneously dissipated in the room.

That is, the compressor 300 compresses the refrigerant at high temperature and high pressure, the outdoor heat exchanger 310 releasing and liquefying heat contained in the refrigerant compressed by the compressor 300, and the refrigerant sent from the outdoor heat exchanger 310. A first expansion valve (320) for making or bypassing the low pressure state according to the opening degree, a first indoor heat exchanger (330) for performing heat exchange with a refrigerant output through the first expansion valve (320), and The second expansion valve 325 for making or bypassing the refrigerant output from the first indoor heat exchanger 330 according to the degree of opening and heat exchange with the refrigerant output through the second expansion valve 325. The second chamber heat exchanger 330 sent to the compressor, and the control unit 340 for controlling the operation of the compressor 300 and the opening degree of the first to second expansion valve (320,325).

At this time, the first indoor heat exchanger 330 and the second indoor heat exchanger 335 are installed in the indoor unit so as to be blown into the room by the indoor unit blower 350.

Referring to the operation of the present invention made as described above are as follows.

First, as a general cooling function, when the indoor temperature is higher than the desired temperature, the first expansion valve 320 is closed to serve as an inflator, and the second expansion valve 325 is completely opened to bypass the outdoor heat exchanger 310. The refrigerant condensed at is expanded under reduced pressure while passing through the first expansion valve 320 to evaporate in the first indoor heat exchanger 330 and the second indoor heat exchanger 335 to emit cold evaporative heat. Then it is blown into the room by the indoor unit blower 350 to cool and dehumidify the room.

As such, when the indoor temperature becomes close to the desired temperature by performing the cooling function, the first expansion valve 320 is completely opened to bypass, and the second expansion valve 325 is closed to serve as an inflator. Then, since the refrigerant discharged from the compressor 300 is condensed in the outdoor heat exchanger 310 and condensation occurs in the first indoor heat exchanger 330, the first indoor heat exchanger 330 dissipates hot condensation heat. .

On the other hand, the refrigerant expanded under reduced pressure by the second expansion valve 325 is evaporated in the second indoor heat exchanger (335) will emit the heat of cold evaporation.

Therefore, the heat emitted from the indoor unit is a hot condensation heat and a cold evaporation heat, so that the temperature of the wind emitted into the room is blown at a temperature substantially equal to the desired temperature, so that dehumidification is performed without being supercooled at the set desired temperature. .

As described above, the opening degree of the first expansion valve 320 and the second expansion valve 325 is finely controlled by the control unit 340 to serve as an inflator or to bypass the first expansion valve. The heat exchanger 330 and the second indoor heat exchanger 335 adjust the amount of cooling evaporation heat and the amount of hot condensation heat according to the opening degree of the first expansion valve 320 and the second expansion valve 325. ) Will continue to run, but the dehumidification can be continued while maintaining the desired temperature without overcooling the room.

As described above, the present invention installs two heat exchangers in the indoor unit and installs expansion valves on each heat exchanger input side to control the expansion valve independently so that cooling and heating are simultaneously performed in two heat exchangers installed in the indoor unit. When the cooling and dehumidification function is performed without frequent on and off, there is an advantage to prevent the overcooling of the room and perform an effective dehumidification function.

In addition, there is an advantage that can prevent the frequent on-off of the compressor to extend the life of the compressor.

Claims (1)

In the air conditioner to measure the indoor and outdoor temperature to perform air conditioning using the heat of condensation and vaporization of the refrigerant by the cooling cycle, A compressor for compressing the refrigerant to high temperature and high pressure; An outdoor heat exchanger for liquefying by releasing heat contained in the refrigerant compressed by the compressor; A first expansion valve for making or bypassing the refrigerant sent from the outdoor heat exchanger to a low pressure state according to the degree of opening; A first indoor heat exchanger configured to perform heat exchange with the refrigerant outputted through the first expansion valve; A second expansion valve for making or bypassing the refrigerant output from the first indoor heat exchanger in a low pressure state according to the degree of opening; A second indoor heat exchanger performing heat exchange with the refrigerant output through the second expansion valve and sending it to the compressor; Close the first expansion valve and open the second expansion valve to generate heat of evaporation in the first to second indoor heat exchanger, open the first expansion valve and close the second expansion valve to close the first indoor heat exchanger. Control unit for controlling the opening degree of the first to second expansion valve and the operation of the compressor to maintain the set room temperature so that the heat of condensation in the second chamber heat exchanger at Air conditioner with a supercooling prevention function, characterized in that consisting of.