KR100781881B1 - Velocity Control System of Condenser Fan for Air Conditioner and Control Method thereof - Google Patents

Abstract

The present invention relates to an outdoor fan speed control system and control method of an air conditioner, which is adapted to be able to control the speed of the outdoor fan of the air conditioner according to the refrigerant pressure of the condenser.

The outdoor fan speed control system of the air conditioner according to the present invention is an air conditioner having a heat exchange cycle including a compressor (C), a condenser (D), an expansion valve (E), and an evaporator (V), Pressure sensor 110 for detecting the pressure in the refrigerant pipe P1 between the compressor C and the condenser D, the operating voltage and the operating frequency (Hz) based on the pressure input from the pressure sensor 110. ) And an inverter 120 outputting control power based on the calculated operating voltage and driving frequency, a fan motor 130 and a fan motor 130 driven by the control power output from the inverter 120. Connected to the outdoor unit fan 140 and the inverter 120 which are rotated by the driving of the inverter) and outputs an 'inverter run control signal' or an 'inverter stop control signal' to the inverter 120. It is configured to include a microcomputer 150 to control the operation The outdoor fan speed control method of the air conditioner according to the present invention includes the step S310 of detecting the pressure of the refrigerant pipe P1 between the compressor C and the condenser D, and the inverter 120 based on the detected pressure. S314 step of calculating the operating voltage and operating frequency by the step, S320 step of outputting the control power by the inverter 120 based on the operation voltage and the operating frequency calculated as described above, the control output from the inverter 120 S322 step of driving the fan motor 130 by the power, characterized in that it comprises a step S324 of the outdoor unit fan 140 is rotated by the drive of the fan motor 130. According to the configuration as described above, there is an advantage that can control the speed of the outdoor unit fan of the air conditioner according to the refrigerant pressure of the condenser.

Air conditioner, condenser, refrigerant pressure, speed control, inverter

Description

Velocity Control System of Condenser Fan for Air Conditioner and Control Method

1 is a block diagram of an outdoor fan control system of an air conditioner according to the prior art.

2 is a block diagram of an outdoor fan speed control system of an air conditioner according to an embodiment of the present invention.

3 is a flowchart of a method for controlling the outdoor fan speed of the air conditioner according to an embodiment of the present invention.

   Explanation of symbols on the main parts of the drawings

V; Evaporator C; compressor

D; Condenser E; Expansion valve

110; Pressure sensor 120; inverter

121; Pressure setting section 130; Fan motor

140; Outdoor fan 150; Micom

160; Compressor switch 170; HP pressure sensor

The present invention relates to an air conditioner, and more particularly, to an outdoor fan speed control system and a control method of an air conditioner adapted to be able to control the speed of an outdoor fan of an air conditioner according to a refrigerant pressure of a condenser.

In general, an air conditioner is an apparatus that creates a comfortable environment by keeping indoor air at a suitable temperature. The temperature maintaining function of the air conditioner is performed by discharging the heat of indoor air to the outside by heat exchange action of the refrigerant circulating through the compressor, the condenser, the expansion valve, and the evaporator.

1 is a block diagram of an outdoor fan control system of an air conditioner according to the prior art.

As shown in FIG. 1, a heat exchange cycle of a general air conditioner includes a compressor (C), a condenser (D), an expansion valve (E), and an evaporator (V). To generate cold air, and the compressor (C) sucks and compresses the low-pressure gaseous refrigerant evaporated in the evaporator (V) to high temperature and high pressure to make condensation easy in the condenser (D), and the condenser (D) is high temperature and high pressure. Condensation of the gaseous refrigerant to make the liquid phase to dissipate heat to the surroundings, the expansion valve to make the high pressure liquid refrigerant to a low pressure to facilitate the evaporation in the evaporator.

In addition, the condenser (D) is provided with an outdoor unit fan (14), the outdoor unit fan 14 by blowing the hot air to the outside by using the pressure difference of the front and rear by the rotation to the refrigerant temperature inside the condenser (D) Serves to lower.

As shown in FIG. 1, the control system of the outdoor unit fan 14 according to the prior art includes a DP switch (Dual Pressue Switch) 11, a microcomputer 15, an MS switch 12, and a fan motor 13. In this case, the outdoor fan 14 is controlled to operate when the refrigerant flowing into the condenser D is equal to or higher than a predetermined pressure.

That is, the DP switch 11 detects the pressure of the refrigerant pipe P1 connected to the condenser D and outputs a detection signal to the microcomputer 15 when the set pressure (for example, 20 Kg / cm ² ) is reached. After receiving the detection signal from the DP switch 11, the microcomputer 15 outputs an ON control signal for switching on the MS switch 12.

When the MS switch 12 is switched on as described above, power is supplied from the AC power source to the fan motor 13 so that the outdoor fan 14 operates to lower the temperature of the condenser D to lower the pressure of the refrigerant pipe.

As described above, when the pressure of the refrigerant pipe P1 drops below the set pressure again by the operation of the outdoor fan 14, the DP switch 11 outputs a detection signal to the microcomputer 15 again and the microcomputer 15 DP. The MS switch 12 is controlled to be switched off based on the detection signal received by the switch 11 to stop the driving of the outdoor fan 14.

However, the outdoor fan control method according to the prior art as described above has the following problems.

First, when the pressure of the refrigerant pipe P1 reaches the set pressure, the outdoor fan 14 rotates while immediately producing an 'out-of-en ~~' sound, since the noise is very loud, about 70 to 80 decibels. It caused pollution problems.

In addition, the operation of the outdoor unit fan 14 according to the pressure inside the condenser (D) does not operate while adjusting the speed as soon as the set value is lower than the set value, only the on / off control to stop the operation is possible, There was a problem that the noise is always very loud. That is, there was a problem that only a loud noise is always output regardless of the operation speed.

Second, because the outdoor fan fan 14 returns to a large speed instantaneously, the mechanical vibration is very severe, which causes the fan motor 13 as well as the outdoor fan fan 14 itself, and the condenser itself is shaken.

The present invention was created to solve the problems of the prior art as described above, and an object of the outdoor fan speed control system and control method for an air conditioner according to the present invention is to simply drive on / off an outdoor fan in the prior art. By overcoming the problems of the available technology, by controlling the speed of the outdoor fan of the air conditioner according to the refrigerant pressure of the condenser, the noise of the outdoor fan can be reduced and the mechanical vibration of the outdoor fan and the fan motor can be minimized. The present invention provides an outdoor fan speed control system and a control method of an air conditioner.

The outdoor fan speed control system of the air conditioner of the present invention for achieving the above object, in the air conditioner having a heat exchange cycle comprising a compressor, a condenser, an expansion valve and an evaporator, between the compressor and the condenser A pressure sensor for detecting a pressure inside the refrigerant pipe, an inverter for calculating an operating voltage and an operating frequency based on the pressure input from the pressure sensor and outputting control power according to the calculated operating voltage and the operating frequency, from the inverter A fan motor driven by an output control power, an outdoor fan fan rotating by driving the fan motor, and an inverter connected to the inverter and outputting an 'inverter run control signal' or 'inverter stop control signal' to the inverter Characterized in that comprises a microcomputer to control the operation of the.

In the outdoor fan speed control system of an air conditioner according to the present invention, a pressure setting unit for setting an operating pressure range consisting of a lower limit pressure and an upper limit pressure is provided in the inverter, and the microcomputer has a lower limit set by the pressure setting unit. Inverter run control signal is output when the pressure between the upper limit and the upper limit pressure is received from the inverter. Inverter stop control signal is output when the inverter receives a pressure outside the lower limit and upper limit pressure from the inverter. It features.

In the outdoor fan speed control system of the air conditioner according to the present invention, the inverter calculates the operating voltage and the operating frequency in proportion to the pressure.

The outdoor fan speed control system of the air conditioner according to the present invention includes a compressor switch for controlling the power supply to the compressor from a commercial power source and a pressure inside the refrigerant pipe between the compressor and the condenser. And outputting an HP (High Pressure) pressure sensor, wherein the microcomputer outputs an 'off control signal' to the compressor switch when the pressure value received from the HP pressure sensor is equal to or greater than a predetermined compressor stop pressure. And switching off.

The outdoor fan speed control method of the air conditioner of the present invention for achieving the above object, step S310 is the pressure of the refrigerant pipe between the compressor and the condenser is detected, the operating voltage and the operation by the inverter based on the detected pressure S314 step of calculating the frequency, S320 step of outputting the control power by the inverter based on the operation voltage and the operating frequency calculated as described above, S322 step of driving the fan motor by the control power output from the inverter, the fan It is characterized in that it comprises a step S324 in which the outdoor fan is rotated by the drive of the motor.

The outdoor fan speed control method of the air conditioner according to the present invention, S316 step is determined by the microcomputer whether the pressure detected in the step S310 is within the operating pressure range set by the pressure setting unit provided in the inverter, and the When the detected pressure as a result of the determination in step S316 is within the operating pressure range, the microcomputer further comprises a step S318 of outputting the 'inverter run control signal' to the inverter, and after the step S318 is performed Characterized in that step S320 is performed.

In the method for controlling the outdoor fan speed of the air conditioner according to the present invention, when the pressure detected as a result of the determination in step S316 is out of the operating pressure range, the microcomputer is configured to prevent the inverter from outputting control power. The step S330 of outputting the inverter stop control signal to the inverter may be performed.

The outdoor fan speed control method of the air conditioner according to the present invention is characterized in that the inverter calculates the operating voltage and the operating frequency in proportion to the detected pressure.

The outdoor fan speed control method of the air conditioner according to the present invention further includes a step S312 in which the microcomputer compares the magnitude of the pressure detected in step S310 with the compressor stop pressure set by the pressure setting unit provided in the inverter. And the step S314 is performed only when the pressure in the refrigerant pipe is smaller than the compressor stop pressure as a result of the comparative determination of the step S312.

In the outdoor fan speed control method of the air conditioner according to the present invention, the microcomputer outputs an 'off control signal' to the compressor switch when the pressure of the refrigerant pipe is greater than or equal to the compressor stop pressure as a result of the comparison of the step S312. The method may further include a step S352 in which the compressor switch is switched off based on the 'off control signal' received from the micom, and step S354 in which the operation of the compressor is stopped by switching off the compressor switch. It is done.

Next will be described in detail with reference to the accompanying drawings, preferred embodiments of the outdoor fan speed control system and control method of the air conditioner of the present invention.

Figure 2 is a block diagram of the outdoor fan speed control system of the air conditioner according to an embodiment of the present invention. The arrow shown in FIG. 2 is the flow direction of the refrigerant.

As shown in FIG. 2, an outdoor unit fan speed control system of an air conditioner according to an embodiment of the present invention includes a compressor (C), a condenser (D), an expansion valve (E), and an evaporator (V). In the air conditioner having a heat exchange cycle configured, the pressure sensor 110, inverter 120, fan motor 130, outdoor unit fan 140, microcomputer 150, compressor switch 160 and HP pressure sensor ( 170).

The pressure sensor 110 is provided in the refrigerant pipe (P1) (so-called refrigerant gas called hot gas line) between the compressor (C) and the condenser (D) to detect the pressure inside the refrigerant pipe (P1) The inverter outputs the current signal to the inverter 120.

The inverter 120 calculates an operating voltage and an operating frequency (Hz) based on the pressure value of the current signal input from the pressure sensor 110, and outputs control power based on the calculated operating voltage and the operating frequency. do.

The operating voltage and the operating frequency are of course the operating voltage and the operating frequency of the fan motor 130.

The calculation of the operating voltage and the operating frequency of the inverter 120 is characterized in that it is calculated in proportion to the pressure.

In addition, the inverter 120 is provided with a pressure setting unit 121. The pressure setting unit 121 is a user interface for inputting a lower limit pressure (13 Kg / cm 2 in this embodiment), an upper limit pressure (20 Kg / cm 2 in this embodiment), and a compressor stop pressure, which are operating pressure ranges.

The fan motor 130 is driven by the control power output from the inverter 120, and the outdoor unit fan 140 is rotated by the drive of the fan motor 130.

The HP pressure sensor 170 is provided in the refrigerant pipe (P1) between the compressor (C) and the condenser (D) to detect the high pressure (for example 23Kg / ㎠ or more) inside the refrigerant pipe (P1) to the microcomputer 150 )

The compressor switch 160 controls on / off power supply from the commercial power source to the compressor (C). And, preferably, the compressor switch 160 is implemented as a magnetic switch.

The microcomputer 150 is connected to the inverter 120 to output an 'inverter run control signal' or 'inverter stop control signal' to the inverter 120 to control the operation of the inverter 120.

The microcomputer 150 passes through the inverter 120 a pressure between the lower limit pressure (13 Kg / cm 2 in this embodiment) and the upper limit pressure (20 Kg / cm 2 in this embodiment) set by the pressure setting unit 121. When receiving from the pressure sensor 110 outputs the 'inverter run control signal', and when receiving a pressure outside the lower and upper limit pressure outputs the 'inverter stop control signal'.

The microcomputer 150 controls the 'off' with the compressor switch 160 when the pressure value received from the HP pressure sensor 170 is equal to or greater than the set pressure value, that is, the compressor stop pressure (23Kg / cm 2 in the present embodiment). Signal 'to switch off the compressor switch.

In addition, the microcomputer 150 stores the lower limit pressure, the upper limit pressure, and the compressor stop pressure, which are the first setting range set by the pressure setting unit 121.

The following describes the operation process of the outdoor fan speed control method of the air conditioner of the present invention having the configuration as described above.

3 is a flowchart illustrating a method for controlling the outdoor fan speed of the air conditioner according to an embodiment of the present invention.

First, the pressure sensor 110 detects the pressure of the refrigerant pipe P1 between the compressor C and the condenser D and outputs the current signal to the inverter 120 (S310).

The inverter 120 calculates an operating voltage and an operating frequency of the fan motor 130 in proportion to the pressure value based on the current signal of the pressure value received from the pressure sensor 110 (S314).

In addition, the inverter 120 outputs the pressure value received from the pressure sensor 110 to the microcomputer 150, and the microcomputer 150 receives the lower limit pressure (in the above example). 13Kg / cm 2) and the upper limit pressure (20Kg / cm 2 in the above example), that is, it is determined whether or not within 13Kg / cm 2 ~ 20Kg / cm 2 (S316).

The microcomputer 150 outputs an 'inverter run control signal' to the inverter 120 when the detected pressure is within the operating pressure range as a result of the determination in step S316. When out of the operating pressure range, the microcomputer 150 outputs an 'inverter stop control signal' to the inverter 120 (S330).

The inverter 120 receiving the 'inverter stop control signal' from the microcomputer 150 does not output the control power.

In addition, the inverter 120 receiving the 'inverter run control signal' from the microcomputer 150 outputs control power for driving the fan motor 130 based on the operation voltage and the operation frequency calculated as described above. Of course, the control power is determined by the operating voltage and the operating frequency.

Therefore, in one embodiment of the present invention, when the pressure of the refrigerant pipe P1 detected is between 13 Kg / cm 2 and 20 Kg / cm 2, the control power is output and the fan motor is driven (S322). In addition, the outdoor unit fan 140 is rotated by the driving of the fan motor 130 (S324).

Table 1 below shows the output ratio (the current output of the fan motor / the maximum output of the fan motor) according to the detection pressure in one embodiment of the present invention is shown in Table 1.

Pressure (Kg / ㎠) Current (mA) Output ratio (%) Pressure (Kg / ㎠) Current (mA) Output ratio (%) 0 4 0 11 12.8 55 One 4.8 5 12 13.6 60 2 5.6 10 13 14.4 65 3 6.4 15 14 15.2 70 4 7.2 20 15 16.0 75 5 8.0 26 16 16.8 80 6 8.8 30 17 17.6 85 7 9.6 35 18 18.4 90 8 10.4 40 19 19.2 95 9 11.2 45 20 20 100 10 12.0 50

TABLE 1

(The current in Table 1 is the value of the current signal output from the pressure sensor to the inverter)

On the other hand, the present invention provides a safety device in case of a problem occurs because the pressure of the compressor is too large, the compressor switch 160 when the pressure of the refrigerant pipe (P1) is a high pressure (for example 23Kg / ㎠ or more) That is to stop the operation of the compressor (C) by operating the. This will be described below.

The HP pressure sensor 170 for sensing a high pressure separately from the pressure sensor 110 detects the pressure inside the refrigerant pipe P1 and outputs the pressure to the microcomputer 150.

The microcomputer 150 compares the magnitude of the pressure received from the HP pressure sensor 170 with the stored compressor stop pressure (23 Kg / cm 2 in the above example) (S312), and the pressure received from the HP pressure sensor 170 is When the compressor stop pressure (ie, 23 Kg / cm 2) is reached, the microcomputer 150 outputs an 'off control signal' to the compressor switch 160 (S350).

The compressor switch 160 receiving the 'off control signal' from the microcomputer 150 performs a switching off operation (S352), and the power supply from the commercial power supply to the compressor C is switched off by switching off the compressor switch. The operation of the compressor C is stopped because it is blocked (S354).

On the other hand, the microcomputer 150 determines the magnitude of the pressure received from the HP pressure sensor 170 compared with the stored compressor stop pressure (23Kg / ㎠ in the above example), the pressure received from the HP pressure sensor 170 is If less than the compressor stop pressure (that is, 23Kg / ㎠) is carried out after the step S314.

The above embodiments of the present invention are merely one embodiment of the technical idea of the present invention, and of course, other modifications are possible within the technical idea of the present invention.

Outdoor fan speed control system and control method of the air conditioner of the present invention having the configuration and operation process as described above has the following effects.

First, unlike the prior art in which only the outdoor fan can be driven on / off, there is an effect of controlling the speed of the outdoor fan of the air conditioner according to the refrigerant pressure of the condenser. That is, the speed of the outdoor fan of the air conditioner can be optimally controlled according to the refrigerant pressure of the condenser.

Second, as described above, the noise of the outdoor fan can be reduced by controlling the speed of the outdoor fan of the air conditioner according to the refrigerant pressure of the condenser.

Third, the mechanical vibration of the outdoor fan and the fan motor is minimized by controlling the speed of the outdoor fan of the air conditioner according to the refrigerant pressure of the condenser.

That is, since the outdoor fan is driven according to the refrigerant pressure, soft start and soft stop are possible, and as a result, mechanical vibration of the outdoor fan and the fan motor can be minimized. As a result, the lifespan of the outdoor fan and fan motor is extended.

Fourth, unlike the case where the outdoor fan speed is always constant by controlling the speed of the outdoor fan of the air conditioner according to the refrigerant pressure of the condenser, the power consumption (that is, energy) can be reduced.

Fourth, there is an effect that can provide a comfortable air conditioner using environment by continuously controlling the required air volume through the speed control.

Claims (10)

delete In an air conditioner having a heat exchange cycle comprising a compressor (C), a condenser (D), an expansion valve (E) and an evaporator (V): A pressure sensor 110 for detecting a pressure inside the refrigerant pipe P1 between the compressor C and the condenser D; An inverter 120 calculating an operating voltage and an operating frequency based on the pressure input from the pressure sensor 110 and outputting control power according to the calculated operating voltage and the operating frequency; A fan motor 130 driven by the control power output from the inverter 120; An outdoor unit fan 140 that is rotated by the driving of the fan motor 130; And Is connected to the inverter 120 is configured to include a microcomputer 150 for controlling the operation of the inverter 120 by outputting an 'inverter run control signal' or 'inverter stop control signal' to the inverter 120, The inverter 120 is provided with a pressure setting unit 121 for setting an operating pressure range composed of a lower limit pressure and an upper limit pressure, When the microcomputer 150 receives a pressure between the lower limit pressure and the upper limit pressure set by the pressure setting unit 121 from the inverter 120, the microcomputer 150 outputs an 'inverter run control signal' and outputs a lower limit pressure and an upper limit pressure. In the case of receiving a pressure out of the inverter 120, the outdoor fan speed control system of the air conditioner, characterized in that for outputting the 'inverter stop control signal'. The method according to claim 2, The inverter 120 calculates the operating voltage and the operating frequency in proportion to the pressure, outdoor fan speed control system of the air conditioner. The method according to claim 2 or 3, A compressor switch (160) for controlling on / off power supply from a commercial power source to the compressor (C); And It further comprises an HP (High Pressure) pressure sensor 170 for detecting the pressure inside the refrigerant pipe (P1) between the compressor (C) and the condenser (D) and outputs it to the microcomputer (150), The microcomputer 150 switches off the compressor switch by outputting an 'off control signal' to the compressor switch 160 when the pressure value received from the HP pressure sensor 170 is equal to or greater than the set compressor stop pressure. Outdoor fan speed control system of air conditioner. delete Step S310 of detecting the pressure of the refrigerant pipe P1 between the compressor C and the condenser D; Step S314, wherein an operating voltage and an operating frequency are calculated by the inverter 120 based on the detected pressure; Step S316 is determined by the microcomputer 150 whether the pressure detected in the step S310 is within the operating pressure range set by the pressure setting unit 121 provided in the inverter 120; In step S318, when the detected pressure is within the operating pressure range as a result of the determination in step S316, the microcomputer 150 outputs an 'inverter run control signal' to the inverter 120; An inverter 120 receiving the 'inverter run control signal' from the microcomputer 150 and outputting control power based on an operation voltage and an operation frequency calculated by the operation S314; A step S322 in which the fan motor 130 is driven by the control power output from the inverter 120; And The outdoor fan fan speed control method of the air conditioner, characterized in that it comprises a step S324 of the outdoor unit fan 140 is rotated by the drive of the fan motor (130). The method according to claim 6, When the pressure detected as a result of the determination in step S316 is out of the operating pressure range, the microcomputer 150 outputs an 'inverter stop control signal' so that the inverter 120 does not output the control power. The outdoor fan speed control method of the air conditioner, characterized in that step S330 is outputted to. The method according to claim 6 or 7, The inverter 120 calculates the operation voltage and the operating frequency in proportion to the detected pressure, the outdoor fan speed control method of the air conditioner. The method according to claim 8, The microcomputer 150 further includes a step S312 in which the magnitude of the pressure detected in the step S310 is compared with the compressor stop pressure set by the pressure setting unit 121 provided in the inverter 120. And the step S314 is performed only when the pressure in the refrigerant pipe P1 is smaller than the compressor stop pressure as a result of the comparison of the step S312. The method according to claim 9, A step S350 in which the microcomputer 150 outputs an 'off control signal' to the compressor switch 160 when the pressure in the refrigerant pipe P1 is equal to or greater than the compressor stop pressure as a result of the comparison of the step S312; Step S352, in which the compressor switch 160 switches off based on the 'off control signal' received from the microcomputer 150; And And a step S354 of stopping the operation of the compressor (C) by switching off the compressor switch.

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