KR100785423B1 - Airconditioner control method - Google Patents

Abstract

The present invention relates to an operation control method of an air conditioner, and more particularly, operation control of an air conditioner that can improve product efficiency by controlling the pressure and temperature in the cycle to an optimal level when the product is stopped. It is about a method. The present invention stops the product by stopping the compressor when the pressure of the refrigerant is adjusted to the constant pressure state after waiting for the internal pressure of the cycle to be at a constant pressure state in the state in which the operation frequency of the compressor is lowered to a certain frequency during the stop operation of the product. I'm making it. In addition, the present invention is characterized in that the opening angle of the electromagnetic expansion valve is adjusted to the maximum value from the time when the frequency of the compressor is lowered so that the cycle pressure can be quickly adjusted to the flat pressure state during the stop operation of the product. After the compressor is stopped, the outdoor fan is operated for a predetermined time so that the remaining heat in the outdoor heat exchanger can be quickly dissipated. From this control, the present invention achieves the effect of improving the product efficiency by controlling the pressure and temperature inside the cycle to the optimum level when stopping the product.

Air conditioner, stop running, pressure,

Description

Air conditioner control method             

1 is an operation process diagram according to the operation control of the air conditioner according to the prior art,

2 is a driving cycle configuration for the operation control of the air conditioner according to the present invention,

3 is a control block diagram for operation control of an air conditioner according to the present invention;

4a, 4b is an operation process diagram according to the operation control of the air conditioner according to the present invention,

5 is a timing chart according to the operation control of the air conditioner according to the present invention.

Explanation of symbols on the main parts of the drawings

10: indoor unit 13,23: heat exchanger

15,25: fan 20: outdoor unit

27: solenoid expansion valve 29: compressor

31: four sides 33: temperature sensor

35: high pressure switch 50: control unit

52: signal conversion unit of the temperature sensor 54: four sides control unit

56: outdoor unit fan drive unit 58: indoor unit fan drive unit

60: compressor drive unit 62: electromagnetic expansion valve drive unit

The present invention relates to an operation control method of an air conditioner, and more particularly, operation control of an air conditioner that can improve product efficiency by controlling the pressure and temperature in the cycle to an optimal level when the product is stopped. It is about a method.

An air conditioner is an air conditioning and heating device that operates to provide a comfortable environment to a user by appropriately adjusting temperature and humidity in a room or a predetermined space. In order to control the room temperature in such air-conditioning equipment is driving a different refrigeration cycle to change the state of the object.

The general refrigeration cycle is composed of a compressor, a condenser, an electronic expansion valve, an evaporator, and a refrigerant connecting pipe connected from the evaporator to the evaporator via all the components. That is, the refrigerant flowing through the refrigerant connection pipes passing through the above components changes state and absorbs or releases heat contained in the indoor air. In this operation, the temperature of the indoor air is increased or decreased.

As life convenience products such as air conditioners are gradually expanded and used, consumers are demanding high energy use efficiency, performance improvement, and convenience products.

In addition, the increasing use of home appliances and electronics in homes, businesses, and factories has caused many countries and organizations to regulate the use of products in many ways. An example is international harmonic regulation, which limits the effect of harmonics on peripherals when the product is used.

The inverter air conditioner was developed to meet these requirements. The inverter air conditioner variably controls the compressor by frequency and satisfies international harmonic regulation standards due to high power factor improvement, while reducing manufacturing costs and providing higher performance.

Such an inverter air conditioner variably controls the operating frequency of the compressor under the control of a controller provided in the product, and controls the pressure in the refrigeration cycle while adjusting the opening angle of the electromagnetic expansion valve.

On the other hand, the inverter air conditioner also stops the product by adjusting the operating frequency of the compressor even when the product is stopped.

1 is a flowchart of an operation controlled when the product is stopped in a conventional inverter air conditioner.

First, the controller (not shown) determines whether a stop command is input (step 100). The step 100 may be a stop signal input directly by the user, or may be a signal applied by the end of the operation time due to the reservation setting.

When the stop command of the product is input in step 100, the control unit lowers the operating frequency of the compressor to a constant value and immediately stops without time delay. That is, the controller performs a control to immediately stop the compressor by adjusting the operating frequency of the compressor to 0 Hz no matter what stage the operating frequency is in the operating state of the compressor (step 110).

After adjusting the compressor operating frequency to the stop state in step 110, the control unit adjusts the opening angle of the electromagnetic expansion valve to adjust the maximum value to control the pressure of the refrigerant circulated in the cycle (step 120). In the step 120, the pressure inside the product is not necessary because the product is stopped, and the opening angle of the electromagnetic expansion valve is opened to the maximum value so that the internal pressure of the cycle is adjusted to a flat pressure state.

When the compressor stops, the controller immediately adjusts the outdoor fan to the stopped state (step 130).

As described above, in the stop control process of the conventional inverter air conditioner, a stop command is input to the control unit and at the same time, the operation of all the components is controlled to the off state.

However, such a stop control of the conventional inverter air conditioner has caused the following problems.

First, the compressor operating frequency was lowered to a constant value at the time of stopping the product, and then immediately stopped without time delay, so that the compressor was stopped before the pressure in the cycle was adjusted to the normal pressure. This causes the compressor to be forcibly stopped at a high pressure, thereby overloading the compressor, thereby causing a problem of shortening the life of the compressor and reducing reliability.

Second, when the product stops, the opening angle is adjusted to the highest value after the compressor stops. Therefore, there was a problem that it takes a long time before the pressure in the cycle is adjusted to the flat pressure state.                         

Third, immediately after the compressor is stopped, the outdoor fan is adjusted to a stopped state, and thus, a problem that takes a predetermined time or more is required before the heat remaining in the outdoor heat exchanger is dissipated.

As a result, the stop operation control of the conventional inverter air conditioner brings overload to the product, resulting in shortening of product life and reliability.

Accordingly, an object of the present invention is to provide an operation control method of an air conditioner that can control the stop operation of a product when the cycle internal pressure is optimal.

Operation control method of the air conditioner according to the present invention for achieving the above object, the condenser and evaporator for performing heat exchange of the refrigerant compressed by the compressor, the electronic expansion device for controlling the amount of refrigerant between the condenser and the evaporator, mode An air conditioner having a refrigerant circulation cycle composed of four sides for switching, comprising the steps of: lowering the operating frequency of a compressor to a predetermined value in order to stop operation of a product; Determining whether the cycle internal pressure has been adjusted to a flat pressure state; And stopping the compressor after the cycle internal pressure is adjusted to a steady state.

The present invention further comprises the step of adjusting the opening angle of the electromagnetic expansion valve to the maximum value.

The opening angle of the electromagnetic expansion valve is adjusted at the time of lowering the operating frequency of the compressor.

The present invention is configured to further include the step of stopping after the operation of the outdoor fan for a predetermined time after the operation stop of the compressor.

In the present invention, the pressure in the cycle is determined based on the piping temperature.

Hereinafter, an operation control method of an air conditioner according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a configuration diagram of a cycle for explaining the operation control of the air conditioner according to the present invention. In the following description, the cooling operation will be described. Therefore, when the cycle is driven in the cooling operation cycle, the heat exchanger 13 on the indoor unit 10 side operates as an evaporator, and the heat exchanger 23 on the outdoor unit 20 side operates as a condenser.

The illustrated cycle is divided into an indoor unit 10 and an outdoor unit 20, and a refrigerant connection pipe is connected between the indoor unit 10 and the outdoor unit 20 so that the indoor unit 10 and the outdoor unit 20 are connected. The refrigerant is circulated in the air.

As shown in the drawing, the refrigeration cycle switches between the compressor 29, the outdoor heat exchanger 23, the outdoor fan 25, the indoor heat exchanger 13, the indoor fan 15, and air conditioning. Four sides 31 for the purpose, and the expansion valve 27 and the like for adjusting the pressure of the refrigerant circulated on the refrigeration cycle.

The compressor 29 suctions and compresses the superheated steam evaporated from the indoor heat exchanger 13, and compresses the superheated steam of high temperature and high pressure to the outdoor heat exchanger 23.                     

The outdoor side heat exchanger 23 operates as a condenser. Therefore, the heat exchanger 23 cools the compressed high-temperature, high-pressure superheated steam to generate a phase change in a liquid state. Therefore, the refrigerant passing through the heat exchanger 23 is deprived of heat to the air passing through the condenser, the temperature is rapidly lowered.

The electromagnetic expansion valve 27 adjusts the flow rate of the refrigerant flowing while the opening angle is adjusted. Therefore, the refrigerant supercooled in the outdoor heat exchanger 23 is reduced in pressure so as to be easily evaporated in the indoor heat exchanger 13.

The indoor heat exchanger (13) evaporates the refrigerant applied from the electromagnetic expansion valve (27). Therefore, the refrigerant passing through the indoor heat exchanger 13 takes heat away from the air passing through the heat exchanger, and the temperature rapidly increases. Therefore, in the heat exchanger 13, the refrigerant phase changes to a gas state, and in the step of supplying the heat exchanger 13 to the compressor 29, the refrigerant becomes a gaseous state of superheat evaporated beyond the saturation state.

In addition, a temperature sensor 33 for detecting a pipe temperature of the outdoor heat exchanger 23 is configured, and the pipe connected to the compressor 29 is automatically switched off when a predetermined pressure is exceeded to protect the compressor. (35) is connected.

Next, a configuration for operation control of the refrigeration cycle will be described.

3 is a configuration diagram for the operation control of the air conditioner according to the present invention.

As shown, the present invention includes a drive unit and a control unit for driving various components on the cooling operation cycle shown in FIG.

The air conditioner of the present invention includes an indoor unit fan driver 58 for driving the indoor unit fan 15, and the outdoor unit fan driver 58 is controlled by the controller 50 to be described later. The operation is turned on / off.

In addition, the air conditioner of the present invention includes an outdoor unit fan driver 56 for driving the outdoor unit fan 25, and the outdoor unit fan driver 56 is controlled by the controller 50 to be described later. ) To turn on / off the operation.

The control part 50 is a structure which controls the operation of the air conditioner of this invention as a whole. Accordingly, the controller 50 inputs detection signals of various sensors provided in the product to determine a current operation state of the product and performs necessary control.

In addition, the air conditioner of the present invention includes a compressor driver 60 for driving the compressor 29. The compressor driver 60 controls the operation frequency of the compressor 29 under the control of the controller 50 and operates the compressor.

The electromagnetic expansion valve driver 62 is configured to adjust the opening degree of the electromagnetic expansion valve 27. The electromagnetic expansion valve driver 62 adjusts the opening degree of the expansion valve 27 by the control of the controller 50.

In addition to this, the four sides control unit 54 is further included, and the four sides control unit 54 controls the operation cycle to be operated as a cooling operation cycle or a heating operation cycle by the control of the control unit 50. That is, the four-side adjustment unit 54 changes the circulation direction of the refrigerant passing through the four-sided 31.

In addition, a signal conversion unit 52 which reads the temperature detected by the temperature sensor 33 for detecting the pipe temperature of the outdoor heat exchanger 23 on the operation cycle and converts the detected temperature into a signal recognizable by the control unit 50 is further included. Included.

Next will be described the operation control process in the air conditioner of the present invention having the above configuration.

4A is a flowchart illustrating an operation for starting operation of an air conditioner according to the present invention.

When an operation signal of the air conditioner is input to the controller 50 from the outside (step 200), the controller 50 applies a signal for driving the outdoor fan 25 to the outdoor fan drive unit 56. The outdoor unit fan driver 56 turns on the outdoor unit fan 25 according to the control signal. Therefore, the outside air is circulated in the outdoor unit heat exchanger 23 to promote heat exchange.

The control unit 50 applies a signal for switching the four sides 31 to the four-side control unit 54 (step 210). At this time, the switching of the upper side 31 adjusts the refrigerant circulation direction of the cycle so that the cooling and heating operation according to the input signal can be made.

In addition, the controller 50 applies a signal to the electromagnetic expansion valve driver 62 so that the operation degree can be adjusted step by step, and the electromagnetic expansion valve driver 62 applies the electromagnetic expansion valve 27 based on this signal. The driving degree is adjusted (step 220).

In this way, under the control of the controller 50, in the state where the outdoor fan 25, the four-sided 31, and the electromagnetic expansion valve 27 are controlled (step 230), the controller 50 operates the compressor 29. The control is performed to operate at the target driving frequency while raising the frequency step by step (step 240). At this time, the control signal of the controller 50 also controls the operation of the compressor 29 through the compressor driver 60.

In this process, the compressor 29, the electromagnetic expansion valve 27, the outdoor fan 25, the four-sided 31, and the like, which receive the control signal of the controller 50, operate, such as cooling or heating desired by the user. The operation will be performed. The controller 50 reads the temperature of various sensors to control the normal operation of the product.

On the other hand, the controller 50 monitors whether to stop the operation of the product while the operation is controlled.

Next, with reference to Figure 4b will be described the process of stopping the operation of the product while adjusting the temperature and pressure on the cycle to the optimum state in the air conditioner of the present invention.

4B is a flowchart illustrating a process controlled when the product is stopped in the air conditioner according to the present invention.

As mentioned above, the controller 50 monitors whether the operation stop signal of the product is input even in a state of controlling the operation of the product (step 300).

Even when it is determined that the operation stop signal of the product is input from step 300, the controller 50 keeps the outdoor unit fan 25 in the on state and maintains the current state of the four sides 31 as it is ( Step 310).

In a state in which the outdoor fan 25 and the four-sided 31 maintain the current operating state in step 310, the controller 50 gradually increases the operating frequency of the compressor 29 to the compressor driver 60 to a predetermined value. In step 320, a signal for descending is output. Under the control of step 320, the compressor driver 60 lowers the operation frequency of the compressor 29 to a predetermined value (about 35 Hz).                     

The controller 50 outputs a signal to the electromagnetic expansion valve driver 62 to adjust the operation degree of the electromagnetic expansion valve 27 to the maximum value from the time when the operation frequency of the compressor 29 decreases. The electromagnetic expansion valve driver 62 adjusts the driving degree to a maximum value based on the control signal of the controller 50 (step 330).

The step 330 is to adjust the opening angle of the electromagnetic expansion valve 27 to the maximum value while the product continues to operate, so that the pressure of the refrigerant circulated can be quickly lowered to the normal pressure.

By the above process, the outdoor fan 25 and the four-sided 31 maintain the operation process in the operating state of the product as it is, the operation degree of the electromagnetic expansion valve 27 was adjusted to the maximum value, and the compressor 29 Keeps operating at low operating frequency. This operating state continues until the pressure of the refrigerant circulating in the indoor unit 10 and the outdoor unit 20 becomes a flat pressure state.

That is, the controller 50 reads the pipe temperature detected by the temperature sensor 33 through the signal converter 52. The control process is maintained until the detected temperature falls to a constant temperature according to the piping temperature detected by the temperature sensor 33 and the pressure of the refrigerant having a proportional relationship according to a predetermined value.

When the temperature detected by the temperature sensor 33 is lowered to a predetermined value or less, the controller 50 determines that the pressure of the refrigerant circulating between the indoor unit 10 and the outdoor unit 20 is adjusted to a flat pressure state (second Step 340).

At this time, the controller 50 stops the compressor by adjusting the operating frequency of the compressor to 0Hz state (step 350).

In addition, even after the operation of the compressor 29 in operation 350 stops, the outdoor fan 25 is driven for a predetermined time so that heat remaining in the outdoor heat exchanger 23 can be quickly dissipated. When the predetermined time elapses, the operation of the outdoor fan 25 is also controlled to the off state (360).

After the operation of the product is stopped by the above process, the four sides 31 are switched (step 370), and the opening angle of the electromagnetic expansion valve 27 is closed in stages (step 380). The stop control process ends.

Fig. 5 shows the operation state of each component on the cycle as a timing chart when starting and stopping the operation of the product according to the present invention.

In the drawing, the time point T0 represents a time point at which an operation start signal is input to the product. At the time point T0, the outdoor fan 25 and the four-sided sides 31 are operated, and after a predetermined time elapses, the electromagnetic expansion valve 27 adjusts the opening degree step by step. When the time T1 is reached, the operating frequency of the compressor 29 gradually increases, indicating that the target operating frequency is reached.

After the operation is controlled in this process, when the operation stop signal of the product reaches the time point T2, the operation frequency of the compressor 29 is gradually lowered to a predetermined frequency, and then the internal pressure of the cycle waits for the flat pressure. And the opening angle of the electromagnetic expansion valve 27 is adjusted to the maximum value from the time when the frequency of the compressor 29 is lowered so that the pressure in a cycle may be adjusted to a flat pressure quickly.                     

As the above process, the compressor is stopped when the pressure of the refrigerant is lowered to a flat pressure state (time T3). After the compressor is stopped, the outdoor fan 25 is stopped at a time T4 after a predetermined time has elapsed, so that the heat remaining in the outdoor heat exchanger can be quickly dissipated. After that, the operation opening degree of the electromagnetic expansion valve 27 is adjusted step by step, and is closed to a certain point, and the four sides 31 are switched to complete all stop operations of the product.

As described above, the present invention stops the compressor when the pressure of the refrigerant is adjusted to the constant pressure state after the internal pressure of the cycle is set to the equilibrium state while the operation frequency of the compressor is lowered to a certain frequency during the stop operation of the product. It is the basic technical idea to stop the product by letting it stop. In addition, the present invention is characterized in that the opening angle of the electromagnetic expansion valve is adjusted to the maximum value from the time when the frequency of the compressor is lowered so that the cycle pressure can be quickly adjusted to the flat pressure state during the stop operation of the product. After the compressor is stopped, the outdoor fan is operated for a predetermined time so that the remaining heat in the outdoor heat exchanger can be quickly dissipated.

Since the operation control method of the air conditioner according to the present invention described above stops the compressor in a state in which the cycle pressure is adjusted to the normal pressure when the air conditioner is stopped, the overload caused by the high pressure is prevented. This can be prevented in advance, and the life of the compressor can be prevented from being shortened.                     

In addition, the operation control method of the air conditioner according to the present invention, the noise generated when the compressor is stopped in a high pressure state is suppressed, it is possible to ensure the reliability of the product.

In addition, according to the present invention, the operation control method of the air conditioner can quickly dissipate the heat remaining in the outdoor heat exchanger by operating the outdoor fan for a predetermined time even after the compressor is stopped.

From these advantages, the present invention is also obtained with the effect of ensuring reliability and extending the life of the product.

Claims (5)

In an air conditioner having a condenser and an evaporator for performing heat exchange of the refrigerant compressed by a compressor, an electronic expansion device for controlling the amount of refrigerant between the condenser and the evaporator, and a refrigerant circulation cycle consisting of four sides for mode switching, Stepping down the operation frequency of the compressor to a predetermined value to stop the operation of the product; Determining whether the cycle internal pressure has been adjusted to a flat pressure state; And stopping the compressor after the cycle internal pressure is adjusted to a flat pressure state. The method of claim 1, And controlling the opening angle of the electromagnetic expansion valve to a maximum value simultaneously with or after the step of gradually lowering the operation frequency of the compressor to a predetermined value. The method of claim 2, The opening angle of the electromagnetic expansion valve is controlled at the time of lowering the operating frequency of the compressor. The method of claim 1, And after stopping the compressor, further operating the outdoor fan for a predetermined time, and then stopping the compressor. The method according to any one of claims 1 to 4, And the pressure in the cycle is determined based on the piping temperature of the outdoor heat exchanger.

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