KR20070009108A - Air conditioner and control method of reverse operation prevention for compressor of the same - Google Patents

Abstract

An air conditioner and a method for controlling prevention of a reverse operation of a compressor of the same are provided to prevent damage to a compressor by preventing the reverse operation of the compressor due to a bad wiring at a connection power source of the compressor. An air conditioner includes a compressor(130), a pressure detection unit, and a control unit(150). A three phase power source applied from a main power source input terminal is supplied to the compressor by an electronic contactor. The pressure detection unit is provided in a refrigerant suction pipe of the compressor to detect the pressure of the suction pipe. The control unit controls the drive of the compressor according to a pressure value detected by the pressure detection unit. The detection of the pressure in the suction pipe is performed by a pressure switch. If the pressure of the suction pipe detected by the pressure detection unit is larger than a predetermined pressure, the drive of the compressor is stopped by the control unit. The detected pressure and the predetermined pressure are compared by the control unit.

Description

Air conditioner and control method of reverse operation prevention for compressor of the same}

1 is a block diagram showing a configuration of an air conditioner according to the prior art.

2 is a cycle configuration diagram of an air conditioner according to the present invention.

3 is a block diagram illustrating a control method of an air conditioner according to the present invention.

4 is a flowchart illustrating a control method of an air conditioner according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100: outdoor unit 110: main power connection terminal

120: magnetic contactor 125: compressor connection power

130: compressor 148: pressure sensing device

150: control unit 160: incorrect wiring detection unit

170: pressure sensing unit

The present invention relates to an air conditioner, and more particularly, to an air conditioner and an air conditioner control method for preventing reverse operation of an air conditioner that prevents burnout caused by a miswiring in an air conditioner using a three-phase power source. will be. More specifically, the present invention relates to an air conditioner and an air conditioner preventing control method of the air conditioner compressor, which prevents the compressor from being burned out by preventing the reverse operation of the compressor due to the error of the main power input terminal as well as from the connection of the compressor. will be.

In general, the air conditioner performs a refrigeration cycle of the refrigerant circulating in the compression process, the condensation process, the expansion process and the evaporation process. In particular, in the case of an air conditioner, the refrigerant is compressed to high temperature and high pressure, and then heat is released to the outside from the condenser and passes through an expansion valve, whereby the temperature and pressure drop significantly. The low temperature and low pressure refrigerant passes through the evaporator, absorbs heat, and then enters the condenser again.

Here, the compression process, the condensation process, and the expansion process are performed in the outdoor unit of the air conditioner, and the evaporation process is performed by the blower fan and the heat exchanger of the indoor unit.

In addition, the air conditioner is largely divided into a window type air conditioner in which a refrigeration cycle apparatus is mounted in one body and installed in a window, and a separate air conditioner installed in the indoor and outdoor by separating the indoor unit and the outdoor unit.

In addition, in the case of the separate type air conditioner, it is classified into a wall-mounted type, an upper tooth type, a ceiling-hanger type, and a ceiling buried type according to the installation method.

In addition, the indoor unit of the structure that can be used as a wall-mounted or upper teeth type, and can be utilized as a ceiling-hanging type according to the needs of the user is called a convertible indoor unit.

On the other hand, as described above, the process of compressing the refrigerant is performed by a compressor, the compressor is applied to the three-phase power through the power connection terminal, the applied three-phase power is applied to the compressor through the electromagnetic contactor.

1 is a block diagram showing the configuration of an air conditioner according to the prior art. Referring to FIG. 1, the outdoor unit 1 includes a main power input terminal 3 for supplying power, a magnetic contactor 4 for controlling power supply to the compressor 6, and a three-phase power supply to the compressor 130. In accordance with the detection state of the detection unit 12 and the detection unit 12 for detecting the connection state of the compressor power supply 5, the main power input terminal 3 connected to the compressor 130 for supplying A control unit 14 for performing an on / off control operation is included.

The detector 12 is connected to the R, S, T power connection terminals in parallel to sense the input power voltage.

The operation or action of the above-described configuration will be described briefly. First, when a power source is connected to the compressor 6, the sensing unit 12 senses an applied voltage. At this time, when the power is normally connected to the terminal, the magnetic contactor 4 connected to the compressor 6 is turned on (ON), the power is normally supplied to the compressor (6).

At this time, if power is not normally connected to the connection terminal, the control unit 14 operates to turn off the magnetic contactor 4. Therefore, even when the control relay 7 of the indoor unit 2 is turned on and attempts to supply power to the compressor 6 of the outdoor unit 1, the power supply is cut off so that the compressor 6 is not operated. do.

By the way, the conventional air conditioner is provided with a means for detecting the incorrect wiring of the main power connection terminal can prevent the reverse operation of the compressor due to the incorrect wiring of the main power connection terminal, There is a problem in that the reverse operation of the compressor cannot be prevented.

The present invention is proposed to solve the problems as described above, air for preventing the reverse phase operation of the compressor due to this misconnection in the compressor power connection power supply, as well as preventing the reverse phase operation due to the misconnection of the main power input terminal. An object of the present invention is to propose a control method of anti-phase operation of a compressor and an air conditioner compressor.

The air conditioner according to the present invention comprises a compressor for receiving a three-phase power applied from the main power input terminal by a magnetic contactor; A pressure sensing unit provided in the refrigerant suction pipe of the compressor to sense a pressure of the suction pipe; And a control unit for controlling the driving of the compressor in accordance with the pressure value detected by the pressure sensing unit.

In accordance with another aspect of the present invention, a method for controlling a reverse operation of a compressor includes: driving a compressor; Detecting a pressure of a refrigerant suction pipe of the compressor; Comparing the detected pressure value with a set pressure value by a controller; And determining whether to operate the compressor according to the comparison result.

According to the present invention, it is possible to prevent the compressor from being burned out by preventing the reverse operation of the compressor due to the misconnection of the main power input terminal as well as preventing the reverse operation of the compressor due to the misconnection of the compressor connection power. have.

Hereinafter, with reference to the drawings will be described a specific embodiment of the present invention. However, the spirit of the present invention is not limited to the embodiments presented, and those skilled in the art who understand the spirit of the present invention can easily suggest other embodiments falling within the scope of the same idea, but the present invention also. Of course, included in the idea of.

2 is a cycle configuration diagram of an air conditioner according to the present invention. Referring to FIG. 2, the air conditioner according to the present invention includes an indoor unit 200 having an indoor heat exchanger (not shown), an outdoor heat exchanger 136, a compressor 130, an expansion device 144, and the like. The outdoor unit 100 is included.

In detail, the outdoor unit 100 includes a compressor 130 for compressing the refrigerant introduced from the indoor unit 200 and an outdoor heat exchanger for condensing the refrigerant of the high temperature and high pressure compressed by the compressor 130 to a medium temperature and high pressure state. 136 and a blower fan 138 disposed on one side of the outdoor heat exchanger 136 to promote heat exchange by blowing air toward the outdoor heat exchanger 136.

In addition, an accumulator 142 is coupled to the suction side of the compressor 130 to separate the liquid refrigerant that has not evaporated from the indoor heat exchanger of the indoor unit 100 so that the refrigerant in the gas state can be sucked. An oil separator 132 is installed on the discharge side of the oil reservoir 132 which recovers the introduced oil and sends the oil back to the compressor 130 and sends only the gaseous refrigerant to the outdoor heat exchanger 136. One side of the) is provided with four sides 53 for changing the flow of the refrigerant flowing into or out of the compressor 134 according to each operation mode when the air conditioner is operated in the cooling or heating.

Here, in the cooling operation, the refrigerant flows in and out in the direction of the solid arrow, and in the heating operation, the refrigerant flows in and out of the dotted line.

In addition, a receiver 140 is installed on the discharge side of the outdoor heat exchanger 136 to temporarily store excess refrigerant, and the liquid refrigerant discharged from the outdoor heat exchanger 136 is the receiver 140. ) Is sent to the expansion device (144).

In addition, the suction pipe through which the refrigerant is sucked into the compressor 130 is provided with a pressure sensing device 148 for detecting the pressure of the suction pipe.

In detail, the pressure sensing device 148 may be a pressure sensor or a pressure switch. Here, the pressure switch is a device to turn on (ON) or off (OFF) when a certain pressure is reached, the present invention can use a pressure switch that is turned on (ON) when the reference pressure is reached. That is, when the pressure of the refrigerant suction pipe of the compressor 130 is smaller than the set pressure, the switch 130 is kept on, so that the compressor 130 is continuously driven, and the pressure of the suction pipe is set. When the pressure is greater than the pressure, the switch is turned off so that the driving of the compressor 130 is stopped.

3 is a block diagram illustrating a control method of an air conditioner according to the present invention.

Referring to FIG. 3, the air conditioner according to the present invention is connected to the main power input terminal 110 for supplying power, and the magnetic contactor 120 connected to the main power input terminal 110 to control power supply to the compressor 130. And connected to the compressor connection power supply 125 and the R, S, T connection terminals of the main power input terminal 110 to supply the three-phase power to the compressor 130, and the erroneous wiring A miswiring detection unit 160 for detecting whether or not, a pressure sensing unit 170 connected to the refrigerant suction pipe of the compressor 130 to detect the pressure of the suction pipe, and including a pressure sensing device; The control unit 150 for controlling the magnetic contactor 120 receives a signal detected by the connection detection unit 160 and the pressure detection unit 170.

In detail, the pressure sensing unit 170 is installed in the refrigerant suction pipe of the compressor 130 and is connected to the control unit 150. The reason why the pressure sensing unit 170 is installed in the refrigerant suction pipe is that a reverse phase phenomenon occurs when the compressor connection power source 125 connected to the compressor 130 becomes a miswiring state. As a result, the refrigerant is not sucked in the suction pipe of the compressor 130 but is discharged. Thus, when the refrigerant is discharged from the suction pipe, the pressure in the suction pipe increases, and the pressure in the discharge pipe decreases. It is to use.

In addition, the controller 150 has previously set the reference pressure of the suction pipe, and compares the pressure detected by the pressure sensing unit 170 with the set pressure.

By the above configuration, when power is first applied and the compressor is driven, the voltage is sensed by the incorrect wiring detection unit 160. In this case, when power is normally connected to the main power input terminal 110, power is applied by the magnetic contactor 120, and the compressor 130 is normally driven. However, when the main power input terminal 110 is miswired, a high voltage is sensed by the miswiring detector 160. The sensed voltage is sent to the controller 150, and the power of the magnetic contactor 120 is cut off by the controller 150 to stop the driving of the compressor 130.

On the other hand, the pressure sensing unit 170 detects the pressure of the refrigerant suction pipe of the compressor 130 and sends the detected pressure to the control unit 150. If the main power input terminal 110 is normally connected, but the compressor connection power supply 125 is incorrectly connected, the compressor 130 operates in reverse and the pressure of the suction pipe is increased. At this time, the pressure sensed by the pressure sensing unit 170 is sent to the control unit 150, the control unit 150 compares the set pressure value and the sensed pressure value, the detected pressure value is greater than the set pressure value When the signal is transmitted to the magnetic contactor 120, the power of the magnetic contactor 120 is cut off, and the driving of the compressor 130 is stopped.

Here, even when the pressure sensing device 148 is a pressure switch, when the pressure of the suction pipe is less than the set pressure, the pressure switch is maintained in an ON state, thereby supplying power to the magnetic contactor 120. When the pressure of the pipe is greater than the set pressure, the pressure switch 148 is turned off, and the control unit 150 receiving the off signal of the pressure switch is the magnetic contactor 120. The power is cut off, the driving of the compressor 130 is stopped.

Accordingly, reverse operation of the compressor 130 may be prevented, thereby preventing burnout of the compressor 130.

4 is a flowchart illustrating a control method of the air conditioner according to the present invention.

Referring to FIG. 4, when the operation of the compressor 130 starts, the pressure detector 170 measures the pressure of the refrigerant suction pipe of the compressor 130 and transmits the detected pressure to the controller 150 (S1). ). Here, if the main power input 110 and the compressor connection power 125 is normally connected, the pressure of the refrigerant suction pipe of the compressor 130 is lowered, and the compressor 130 will be operated by a normal cycle. On the contrary, if the main power input terminal 110 is normally connected, but the wrong connection is made in the compressor connection power supply 125, the pressure of the refrigerant suction pipe of the compressor 130 is increased and the pressure of the discharge pipe is lowered. Compressor 130 will be operated in reverse phase.

Thereafter, the controller 150 compares the pressure sensed by the pressure sensing unit 170 with a preset pressure (S2). When the detected pressure is greater than the set pressure as a result of the comparison by the control unit 170, for example, if the detected pressure is greater than 10 Kgf / cm 2, the control unit 150 may contact the magnetic contactor 120. The power is cut off (S3). When the power of the magnetic contactor 120 is cut off, the power applied to the compressor 130 is also cut off so that the driving of the compressor 130 is stopped (S4).

Here, when the pressure switch is used as the pressure sensing means, when the detected pressure is greater than the set pressure as described above, the pressure switch is turned off (OFF), the control unit 150 by the magnetic contactor ( The power of the 120 is cut off, and the driving of the compressor 130 is stopped.

Therefore, not only the reverse operation of the compressor 130 due to the incorrect wiring of the main power input terminal 110 can be prevented, but also the reverse operation of the compressor 130 due to the incorrect wiring of the compressor connection power source 125 can be prevented. do.

The anti-phase operation prevention control method of the air conditioner and the air conditioner compressor according to the present invention, not only prevents the reverse phase operation of the compressor due to incorrect wiring of the main power input terminal, There is an effect that it is possible to prevent the burner of the compressor by preventing the reverse operation.

Claims (8)

A compressor receiving the three-phase power applied from the main power input terminal by the magnetic contactor; A pressure sensing unit provided in the refrigerant suction pipe of the compressor to sense a pressure of the suction pipe; And And a control unit for controlling the driving of the compressor according to the pressure value detected by the pressure sensing unit. The method of claim 1, Pressure sensing of the suction pipe is characterized in that made by a pressure switch. The method of claim 1, And the driving of the compressor is stopped by the controller when the pressure of the suction pipe detected by the pressure sensing unit is greater than a set pressure. Driving the compressor; Detecting a pressure of a refrigerant suction pipe of the compressor; Comparing the detected pressure value with a predetermined pressure value by a controller; And The control method of the reverse operation of the air conditioner compressor, characterized in that it comprises the step of determining whether or not the operation of the compressor according to the comparison result. The method of claim 4, wherein Pressure detection of the suction pipe is controlled by a reverse switch of the compressor, characterized in that made by a pressure switch. The method of claim 4, wherein The control method of the reverse operation of the compressor, characterized in that the drive of the compressor is stopped when the detected pressure value is greater than the set pressure value. The method of claim 4, wherein If the detected pressure value is greater than the set pressure value, it is determined that the wrong connection in the compressor connection power supply. The method of claim 4, wherein The control method of the anti-phase operation of the compressor, characterized in that it is further determined by the control unit whether the main power connection terminal is incorrectly connected.

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