KR20020035288A - Fan control Method for Airconditioner - Google Patents

Abstract

PURPOSE: A method for driving air conditioner to intermittently operate outdoor fan in low temperature condition is provided to prevent intermittent operation of the air conditioner by controlling the outdoor fan. CONSTITUTION: A method includes four steps. The first step(100) is to detect temperature(Ts) of a piping of an indoor heat exchanger and to observe whether the temperature gets lower than a first fixed temperature(T3) on cooling operation. The second step(110) is to stop an outdoor fan when the temperature of the piping is lower than the first fixed temperature. The third step(120) is to stop a compressor and the outdoor fan when the temperature of the piping is lower than a second fixed temperature(T4) lower than the first fixed temperature. The fourth step(150,160) is to drive the stopped outdoor fan and compressor again when the temperature of the piping increases over the first fixed temperature and the second fixed temperature, respectively, after the second step and the third step.

Description

Air conditioner driving method for outdoor fan intermittent operation in low temperature conditions {Fan control Method for Airconditioner}

The present invention relates to an air conditioner device capable of intermittent operation of an outdoor fan under low temperature conditions, and more particularly, to an outdoor air conditioner capable of intermittent operation of an outdoor fan under low temperature conditions to control an outdoor fan to prevent freezing of an indoor heat exchanger. It is about.

An air conditioner is a device for maintaining indoor air in a state most suitable for use and purpose. For example, in summer, the room is cooled down and the winter is heated. In addition, the air conditioner also has a function of controlling the indoor humidity to adjust the indoor air to a comfortable clean state. Because of the convenience of air conditioners, more and more products are being used gradually, and users prefer energy efficiency, excellent performance and convenient products.

In general, an air conditioner is composed of an indoor unit and an outdoor unit.

The indoor unit includes a heat exchanger that absorbs heat while the refrigerant vaporizes during the cooling operation, and an indoor fan that discharges cold air around the heat exchanger into the room.

The outdoor unit includes a compressor for converting the refrigerant into a high temperature and high pressure, a heat exchanger for lowering the temperature of the refrigerant supplied from the compressor to allow the liquefied refrigerant to flow, and an outdoor fan for lowering the temperature of the refrigerant in the heat exchanger.

A pipe is connected between the indoor unit and the outdoor unit so that refrigerant is circulated, and a control unit for controlling and detecting each component of the indoor unit and the outdoor unit is included.

Next, a structure and an operation of a conventional air conditioner will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, the air conditioner includes an indoor heat exchanger (E10), an outdoor heat exchanger (CD30), an expansion device (CT60), and a compressor (C20), and the circulation direction of the refrigerant according to heating or cooling. This changes.

During cooling, the compressor C20 converts the refrigerant introduced from the indoor heat exchanger E10 into a refrigerant having a high temperature and high pressure, and delivers the refrigerant to the outdoor heat exchanger CD30, and the outdoor refrigerant exchanger CD30 transmits the refrigerant temperature. Lower using an outdoor fan provided inside.

The refrigerant whose temperature is lowered through the outdoor heat exchanger (CD30) is supplied to the expansion device (CT30) to convert the high-pressure refrigerant to low pressure, and transfer to the indoor heat exchanger (E10) to lower the temperature of the room. The refrigerant is supplied to the compressor again and circulated to perform a cooling operation.

When heating, the circulation direction of the refrigerant circulates in the reverse direction of cooling, and the compressor (C20) receives the refrigerant from the outdoor heat exchanger (CD30), converts it into high temperature and high pressure, and supplies it to the indoor heat exchanger (E10) to open it indoors. To supply.

In addition, the refrigerant is supplied to the expansion device (T60) is converted to low pressure is supplied to the outdoor heat exchanger (CD30) is converted to a low temperature state, it is supplied to the compressor (C20) and circulated again to perform the cooling operation.

As shown in FIG. 2, the controller of the air conditioner includes a power supply unit U10, a pipe temperature detector T10, an input signal detector K10, a compressor driver P10, and an outdoor fan driver F10. K50 and each of the components are connected to send and receive signals.

The power supply unit U10 supplies a constant voltage to drive the control unit K50, and the pipe temperature detection unit T10 supplies a pipe to prevent the pipe of the indoor heat exchanger E10 from freezing during long time cooling operation. The component that senses the temperature.

The input signal detector K10 is a component that senses a signal operated by a user by detecting a signal applied from an external input device of an air conditioner or a remote controller, and the compressor driver P10 and the outdoor fan driver F10. Is a component for driving the compressor and the outdoor fan.

The controller K50 is connected to each component to detect / determine an input signal to control the operation of each component.

As shown in FIG. 2, the controller of the air conditioner detects a signal applied from an external input device or a remote controller of the air conditioner to determine an operation desired by the user.

The control unit K50 senses / determins a pipe temperature using a pipe temperature detecting unit T10, and drives the compressor driving unit P10 and the outdoor fan driving unit F10 according to a user's desired operation to heat or Perform cooling operation.

The following describes the operation of the cooling operation according to the prior art with the flowchart of FIG.

When the user selects the cooling operation using the input signal detecting unit K10 of the indoor unit and operates the driving switch, the control unit K50 detects the user request signal through the input signal detecting unit K10 and drives the outdoor unit. Allow the air conditioner to run.

In the tenth step, the control unit K50 monitors the pipe temperature state of the indoor heat exchanger using the pipe temperature detecting unit T10, and if the detected pipe temperature is lower than the compressor stop temperature preset in the control unit K50. If yes, go to Step 15.

However, if the pipe temperature is higher than the compressor stop temperature in the tenth step, the controller K50 considers that the indoor heat exchanger does not freeze and continuously operates the air conditioner and simultaneously detects the pipe temperature.

In the fifteenth step, since the pipe temperature is lowered, the pipe of the indoor heat exchanger may freeze, so that the controller K50 stops the operation of the compressor and the outdoor fan to block the progress of the freezing state.

The operation of the compressor is stopped by the operation of the fifteenth step, the circulation of the refrigerant circulating the indoor unit and the outdoor unit is stopped, and the outdoor fan also stops the operation, the operation of the air conditioner is stopped.

In the next step 20, after the operation of the compressor is stopped, the controller K50 compares whether the pipe temperature of the indoor heat exchanger has risen to a temperature at which the compressor can be driven using the pipe temperature sensor T10. Judging.

If the pipe temperature is lower than the compressor driving temperature in the twentieth step, the operation of the compressor and the outdoor fan is maintained as it is until the pipe temperature rises.

However, if the pipe temperature is higher than the compressor driving temperature, the pipe temperature rises after the fifteenth step, so that the pipe temperature is maintained without being frozen.

In step 25, the controller K50 drives the compressor and the outdoor fan to circulate the refrigerant for normal air conditioner operation.

Since the 25th step to the 10th step to detect the temperature of the pipe to repeat the steps as described above to perform the cooling operation.

That is, in the air conditioner of the prior art as shown in Figure 2 by controlling the pipe temperature during the long time cooling operation in conjunction with the compressor and the outdoor fan to control.

That is, in the related art, in order to prevent the heat exchanger from freezing during long time cooling operation, the control unit stops the operation of the compressor and the outdoor fan when the pipe temperature is lower than the predetermined temperature.

However, since the compressor does not operate immediately after the operation stops for structural reasons, the compressor can be operated only after a certain time has elapsed.

In addition, the prior art has a problem that the operation rate of the air conditioner is worsened by the intermittent operation frequency of the compressor during the long time cooling operation, the cooling performance and efficiency is reduced.

Accordingly, an object of the present invention is to provide an air conditioner driving method capable of intermittent operation of an outdoor fan in a low temperature condition capable of controlling an outdoor fan to prevent an intermittent operation of the air conditioner.

1 is a structural diagram of an air conditioner according to the prior art,

2 is a block diagram of a control unit according to the prior art,

Figure 3 is a flow chart of the cooling operation of the air conditioner according to the prior art,

Figure 4 is a flow chart of the cooling operation of the air conditioner according to the present invention.

Explanation of symbols on the main parts of the drawings

E10: Indoor heat exchanger CD30: Outdoor heat exchanger

C20: compressor K50: control unit

T60: expansion device U10: power supply

P10: compressor drive unit F10: outdoor fan drive unit

T10: Piping temperature detector K10: Input signal detector

According to an aspect of the present invention, there is provided an air conditioner driving method capable of intermittent operation of an outdoor fan at a low temperature condition, comprising: a first step of sensing / determining a pipe temperature of an indoor heat exchanger during an air conditioner cooling operation; A second step of stopping the operation of the compressor and the outdoor fan when the pipe temperature is lower than the compressor stop temperature; A third step of stopping the operation of the outdoor fan when the pipe temperature is greater than the compressor stop temperature and less than the outdoor fan stop temperature; If the pipe temperature is greater than the outdoor fan stop temperature is configured to include a fourth step of maintaining the state of the operating air conditioner and repeating the first step.

According to the present invention, after the second step, the pipe temperature is sensed / determined to drive the compressor and the outdoor fan when the pipe temperature is greater than the compressor operating temperature, and when the pipe temperature is smaller, the pipe temperature is redetected / determined. do.

According to the present invention, if the pipe temperature is sensed / determined after the third step, the outdoor fan is driven when the temperature is greater than the outdoor fan driving temperature, and the process proceeds to the first step. .

Hereinafter, a driving method of an air conditioner capable of intermittent operation of an outdoor fan at low temperature according to the present invention will be described with reference to the accompanying drawings.

The configuration of the air conditioner according to the present invention is the same as the configuration of the air conditioner shown in Figs. 1 and 2, the compressor (C20), outdoor heat exchanger (CD30), expansion device (T60) and the indoor heat exchanger (E10) It is configured to include.

In addition, the control unit of the present invention is connected to the power supply unit (U10), the pipe temperature sensor (T10), the input signal detector (K10), the compressor driver (P10), the outdoor fan driver (F10) as shown in FIG. Control each component.

Next, a driving method for air conditioner cooling operation according to the present invention will be described with a flowchart of FIG. 3.

First, when the air conditioner is in the cooling operation, the control unit K50 proceeds to step 100 to detect the pipe temperature using the pipe temperature detecting unit T10, and the outdoor fan preset to the pipe temperature and the control unit K50. / Determine operation by comparing with compressor driving temperature.

If the pipe temperature is less than the compressor stop temperature T4 in step 100, the process proceeds to step 120.

In step 120, since the indoor heat exchanger may freeze when the air conditioner continues to operate, the operation of the compressor and the outdoor fan is stopped to stop the operation of the air conditioner so that refrigerant does not circulate.

The next step 140 is to re-measure the pipe temperature TS of the indoor heat exchanger after the operation of the compressor and the outdoor fan is stopped.

If the pipe temperature TS is greater than the compressor driving temperature T4 by the pipe temperature detecting unit T10 in step 140, the process proceeds to step 160 and the pipe temperature TS is the compressor driving temperature (T). If it is smaller than T4), it is repeatedly detected until the pipe temperature TS is increased while the compressor and the outdoor fan are turned off.

In step 160, as the pipe temperature TS increases, the compressor and the outdoor fan are operated to normally drive an air conditioner to discharge cold wind to an indoor heat exchanger.

After the 160th step, the process proceeds to the 100th step to detect the pipe temperature (TS) of the indoor heat exchanger, and compares the preset temperature of the predetermined compressor and the outdoor fan.

If the pipe temperature TS detected by the pipe temperature sensor in step 100 is greater than the compressor stop temperature T4 and less than the outdoor fan stop temperature T3, the controller 110 proceeds to step 110.

In step 110, the detected pipe temperature TS is higher than the freezing temperature, and thus, the driving compressor continues to operate and the outdoor fan stops the operation.

That is, while the compressor continues to be driven, the outdoor fan of the outdoor heat exchanger is stopped, and the temperature of the refrigerant flowing into the indoor heat exchanger is higher than during the indoor fan operation, thereby increasing the pipe temperature.

In the next step 130, after the 110 step, a change in the pipe temperature TS is sensed. If the pipe temperature TS is greater than the outdoor fan stop temperature T3, the process proceeds to step 150. If the pipe temperature TS is low, the flow proceeds to step 130 and continues to detect the pipe temperature TS.

The step 150 is to maintain the temperature of the refrigerant by driving the outdoor fan that has stopped operating while maintaining the operation of the compressor that is being driven as the pipe temperature TS increases.

After the 150 th step, the process proceeds to the 100 th step to continuously detect the piping temperature TS of the indoor heat exchanger.

If the pipe temperature TS of the indoor heat exchanger is greater than the outdoor fan stop temperature T3 in the step 100 during the cooling operation, since the compressor and the outdoor unit are already driven, the process proceeds to the step 100 and the pipe temperature TS ) And detect it.

As described above, in the present invention, when the air conditioner is cooled for a long time, the outdoor fan is intermittently operated to control the temperature of the refrigerant, and thus the pipe temperature region detected by the pipe temperature sensor is extended to a region capable of continuously operating the compressor.

Therefore, the air conditioner of the present invention can minimize the intermittent operation of the compressor to improve the efficiency and performance of the air conditioner.

As described above, the present invention improves the frequent intermittent operation of the compressor during the cooling operation of the air conditioner by controlling the temperature of the refrigerant supplied to the indoor side by controlling the outdoor fan.

Therefore, since the continuous operation of the air conditioner is possible, there is an effect that can improve the cooling capacity.

Claims (1)

A first step of detecting the pipe temperature of the indoor heat exchanger during the cooling operation and monitoring whether the pipe temperature is lowered below the first set temperature; A second step of stopping the outdoor fan when the detected pipe temperature is lower than a first set temperature; A third step of stopping the compressor and the outdoor fan when the detected pipe temperature is lower than or equal to the second set temperature lower than the first set temperature; After performing the second and third steps, when the detected pipe temperature rises above each set temperature, a fourth step of restarting the compressor and the outdoor fan in a stopped state includes an intermittent fan in a low temperature condition. How to drive air conditioner.