KR20070066587A - The compressure's control method of the multi-air conditioner - Google Patents

Abstract

A compressor control method for a multi-type air conditioner system is provided to set target pressure and upper and lower limits thereof for turning on a constant speed compressor continuously until operation pressure of an inverter compressor reaches the limits, thereby stabilizing the compressor in a short time in spite of fast load change of an indoor unit. A compressor control method for a multi-type air conditioner system comprises the steps of measuring operation pressure of an inverter compressor by a pressure sensor as the compressor is driven(S200), and determining whether the measured operation pressure reaches a predetermined range of target pressure(S300). A constant speed compressor is turned on if the measured operation pressure reaches a lower limit in the predetermined range(S350,S352). The constant speed compressor is turned off if the measured operation pressure exceeds an upper limit in the predetermined range(S350,S351). If the measured operation pressure reaches the predetermined range, one or more constant speed compressors are controlled in sequence(S360).

Description

 Compressor control method of multi air conditioner {The compressure's control method of the multi-air conditioner}

1 is a flowchart illustrating a control method of a compressor system according to the related art;

Figure 2 is a schematic perspective view showing a multi-type air conditioner according to the present invention

3 is a block diagram showing a multi-type air conditioner according to the present invention

4 is a block diagram showing the configuration of a compressor system of a multi-air conditioner according to an embodiment of the present invention;

5 is a flowchart illustrating a compressor control method of a multi air conditioner according to an embodiment of the present invention;

6 is a flowchart illustrating a compressor control method of a multi air conditioner according to another embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

11, 12, 13, 14: indoor unit 21, 22, 23: outdoor unit

51: indoor heat exchanger 54: indoor expansion valve

61: accumulator 62: inverter compressor

63: constant speed compressor 64: oil separator

65: four-way valve 66: capillary tube

70: outdoor heat exchanger 74: outdoor electromagnetic expansion valve

80: supercooling device 90: liquid injection device

107: pressure sensor

The present invention relates to a compressor control method of a multi-air conditioner, and in particular, by controlling a compressor in response to a rapid load change, the pressure is quickly reached at a target high pressure in heating operation and a target low pressure in cooling operation. The present invention relates to a compressor control method of a multi air conditioner that can improve the performance of the machine.

Conventional compressor system uses an inverter compressor that can control the rotational speed of the compressor at various speeds to optimize the cooling / heating output and electrical consumption, which is a system that does not use the inverter compressor rated voltage 220V (60Hz) This is because unnecessary power is consumed by operating at a constant rotation speed and maintaining a constant cooling output.

Here, since the inverter compressor can automatically reduce the rotational speed of the compressor motor when the temperature is lowered, the power consumption can be minimized, compared to 20% to 30% of the power consumption compared to appliances that do not use the inverter compressor Can be.

Thus, the compressor system using the inverter compressor is used in power-saving home appliances in refrigerators and air conditioners, the following description will be limited to the compressor of the air conditioner.

1 is a flowchart illustrating a control method of a compressor system according to the related art.

The conventional compressor system starts the inverter compressor (S1) and then starts the inverter compressor by raising it to the maximum frequency (S2).

Then, the inverter compressor reaches the maximum frequency and then drives the constant speed compressor, which lowers the maximum frequency reached by the inverter compressor to the frequency at initial startup and starts the constant speed compressor (S3).

The constant speed compressor is turned on and off as the load increases and decreases, and the necessary cooling / heating output can be obtained by increasing or decreasing the inverter compressor within a normal frequency as necessary.

That is, in the conventional compressor system, the inverter compressor is operated at a high frequency during the trial run after the new product is newly installed or in the morning or when the external air temperature is low, and then the constant speed compressor is sequentially controlled.

However, fluctuations in the indoor load, such as the case where 16 indoor units including a large number of indoor units, for example, 15 indoor units are turned off while one indoor unit is turned on, or 15 indoor units are turned on during operation, are caused. In severe cases, when the constant speed compressor is sequentially controlled, it takes a long time to reach the set target low pressure or target high pressure.

The present invention has been made to solve the above problems of the prior art, the outdoor unit including a plurality of constant speed compressor in the product connected in parallel to the on (ON) / off (OFF) of the indoor unit and a rapid load change in response to the compressor The purpose of the present invention is to provide a compressor control method of a multi-air conditioner, which improves product performance and reliability by rapidly reaching a target high pressure during heating operation and a target low pressure during cooling operation.

Compressor control method of the multi-air conditioner according to the present invention for solving the above problems, the first step of measuring the operating pressure of the compressor by the pressure sensor as the inverter compressor is driven during the heating operation of the multi-air conditioner And a second step of determining whether the operating pressure detected in the first step has reached the upper and lower constant ranges of the target pressure, and turning on the constant speed compressor until the lower limit value of the target pressure is reached as a result of the determination in the second step. And a third step of turning off the constant speed compressor when the upper limit value of the target pressure is exceeded.

The method may further include sequentially controlling one or more compressors when the operating pressure reaches the upper and lower predetermined ranges of the target pressure.

On the other hand, in the second step, the upper limit of the upper and lower constant range of the target pressure is 120% of the target pressure, the lower limit is 80% of the target pressure, characterized in that the target pressure of the compressor is 500kPa.

In addition, during the cooling operation of the multi-air conditioner, as the inverter compressor is driven, a first step of measuring the operating pressure of the compressor by a pressure sensor, and the operating pressure detected in the first step is in a predetermined upper and lower range of the target pressure. In the second step of determining whether it has been reached, and as a result of the determination in the second step, the constant speed compressor is turned on until the upper limit value of the target pressure is reached, and the constant speed compressor is turned off when the lower limit value of the target pressure is exceeded. OFF) characterized in that it comprises a third step.

The method may further include sequentially controlling one or more compressors when the operating pressure reaches the upper and lower predetermined ranges of the target pressure.

On the other hand, in the second step, the upper limit of the upper and lower constant range of the target pressure is 120% of the target pressure, the lower limit is 80% of the target pressure, characterized in that the target pressure of the compressor is 1800kPa.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 2 is a schematic perspective view of a multi-type air conditioner according to the present invention, Figure 3 is a block diagram showing a multi-type air conditioner according to the present invention, Figure 4 is a multi-air conditioner according to an embodiment of the present invention 5 is a block diagram showing a configuration of a compressor system, FIG. 5 is a flowchart illustrating a compressor control method of a multi-air conditioner according to an embodiment of the present invention, and FIG. 6 is a multi-air conditioner according to another embodiment of the present invention. The compressor control method of the present invention is a flowchart shown.

On the other hand, in the multi-air conditioner according to an embodiment of the present invention, the plurality of compressors may be composed of a plurality of constant speed compressors that are driven at constant speed, and may be composed of a plurality of inverter compressors that are shifted in speed, but in the present specification, An inverter compressor capable of operation and a plurality of constant speed compressors operated at constant speed will be described as an example in which an outdoor unit including the plurality of constant speed compressors is connected in parallel.

As shown in FIG. 2 or 3, the multi-type air conditioner according to the present invention includes a plurality of indoor units 11, 12, 13, 14 installed in the interior of a building, and the indoor units 11, 12. And an outdoor unit (21) 22 (23) connected to (13) (14), wherein the indoor unit (11) (12) (13) (14) and the outdoor unit (21) (22) (23) It is connected through the refrigerant pipes 30, 40, the outdoor unit 21, 22, 23 is driven by the request of at least one of the indoor unit (11) 12 (13) (14), As the air / heating capacity required by the indoor units 11, 12, 13, 14 increases, the number of operations of the outdoor units 21, 22, 23 and the compressors installed in the outdoor units 21, 22 are increased. The number of operations of is increased.

Here, the indoor units 11, 12, 13, and 14 are indoor heat exchangers 51 for exchanging refrigerant and indoor air, and indoor blowers installed near the indoor heat exchangers 51 to circulate indoor air. 52 and an indoor expansion valve 54 for expanding the refrigerant flowing to the indoor heat exchanger 51 when cooling.

The outdoor units 21, 22, and 23 are composed of first, second, and third outdoor units 21, 22, 23, as shown in FIG. 2, and extract only gaseous refrigerants from the refrigerants supplied from the indoor units. An accumulator 61, compressors 62, 63, 67 for receiving and compressing the gas refrigerant extracted from the accumulator 61, and a flow path of the refrigerant compressed by being connected to the compressors 62, 63. It comprises a four-way valve (65) for selecting the, and an outdoor heat exchanger (70) for heat exchange between the refrigerant supplied from the four-way valve (65) and the outdoor air.

Here, the first outdoor unit 21 is provided with an inverter compressor 62 and a constant speed compressor 63, and the second and third outdoor units 22 and 23 are provided with only a plurality of constant speed compressors 67, and the inverter compressor. Reference numeral 62 denotes a compressor capable of varying the compression capacity of the refrigerant, and the constant speed compressors 63 and 67 are compressors having a constant compression capacity of the refrigerant.

In addition, the inverter compressor 62 is responsible for 70% of the compression capacity of the first outdoor unit 21, the constant speed compressor 63 installed in the first outdoor unit 21 is responsible for the remaining 30%, the remaining outdoor unit 22 The constant speed compressor (67) of the (23) is responsible for a compression capacity of 50% each.

On the other hand, an oil separator 64 is installed in a pipe connecting the compressors 62 and 63 and the four-way valve 65, and the oil separator 64 is provided at the suction side of the compressors 62 and 63. Connected.

In addition, a pressure sensor 107 is installed between the oil separator 64 and the compressors 62, 63, 67 to sense the pressure of the refrigerant discharged from the compressors 62, 63, 67.

In particular, the oil separator 64 separates oil from the refrigerant discharged from the compressors 62 and 63, and supplies the separated oil to the compressors 62 and 63 to supply the compressors 62 and 63. Maintain an appropriate amount of oil inside. And the suction side pipe of the oil separator 64 and the compressor 62, 63 is connected through a capillary tube 66, the oil is moved through the capillary tube 66.

The refrigerant pipe 30 for guiding the refrigerant discharged from the outdoor heat exchanger 70 to the indoor heat exchanger 51 includes electromagnetic expansion valves lev and 74 for expanding the refrigerant upon heating, and the indoor heat exchange during cooling. Sub-cooling device 80 for cooling the refrigerant moved to the machine 51, and a liquid injection device 90 for lowering the temperature of the compressor (62, 63) is provided.

Here, the outdoor electromagnetic expansion valve 74 is fully open during cooling to allow the refrigerant condensed in the outdoor heat exchanger to pass through without expansion, but when heated, the outdoor electromagnetic expansion valve 74 is opened to a predetermined size to convey the refrigerant condensed in the indoor heat exchanger 51. Before entering the outdoor heat exchanger 70 is expanded to a liquid in a spray state.

On the other hand, the refrigerant pipe (30 ") is provided with a dryer (110) for removing moisture in the refrigerant pipe (30"), the refrigerant passing through the dryer 110 is a by-pass in the refrigerant pipe (30 ") Passed and flow to the indoor heat exchanger (51) side.

As shown in Figure 4, the compressor system of the multi-air conditioner according to an embodiment of the present invention is a plurality of indoor units (11, 12, 13, 14), the current operating pressure of the inverter compressor during the initial operation A pressure sensing unit 200 for sensing, a compressor control unit 300 for comparing the operation pressure with a target high pressure or a target low pressure, an inverter compressor 62 controlled by the compressor control unit, and one or more numbers It is characterized by including a constant speed compressor (63).

The pressure sensing unit 200 detects the current operating high pressure by a pressure sensor mounted on the compressor discharge side.

In addition, the compressor controller 300 calculates and compares the current operating high pressure and the pressure of the compressor required by the air conditioner, and turns on / off the inverter compressor 62 and the constant speed compressor 63. By determining OFF and giving a control command, the inverter compressor 62 and the constant speed compressor 63 are operated.

In addition, the inverter compressor 62 is controlled by the compressor control unit 300.

That is, the command transmitted from the compressor control unit 300 is transmitted to the inverter compressor 62, and the operation and the frequency control are performed accordingly.

In addition, when the load increases, the constant speed compressor 63 including one or more parts is operated according to an operation command of the compressor control unit 300.

For example, when there are severe fluctuations in the indoor load, such as when 16 indoor units turn off 15 indoor units during operation or 1 indoor unit turns on 15 indoor units during operation, the compressor controller 300 ) Controls the constant speed compressor sequentially.

However, since it takes a long time to reach the target high pressure or the target low pressure, by setting an upper and lower limit value for the target high pressure or the target low pressure, if the range is out of this range, the constant speed compressor 63 is Keep it ON.

Referring to the compressor control method of the multi-air conditioner according to an embodiment of the present invention configured as described above are as follows.

On the other hand, the overlapping procedure in the control method of the compressor system according to an embodiment of the present invention shown in Figs.

As shown in Figure 5, the control method of the compressor system according to an embodiment of the present invention, when the multi-air conditioner is heating operation, the first step of starting by setting the inverter compressor 62 to the initial frequency (S100) And a second step S200 of determining the current operating pressure of the inverter compressor 62 by a pressure sensor, and determining whether the detected operating pressure reaches the upper and lower limits of the compressor target pressure of the air conditioner. It consists of three steps (S300).

In the first step (S100), the compressor controller 300 issues a command signal for starting the inverter compressor 62, and then starts the inverter compressor 62 by setting the initial frequency.

At this time, when the maximum frequency of the inverter compressor 62 is 100Hz, the initial frequency is set to 40Hz, which is about 30% of the maximum frequency.

In addition, the compressor control unit 300 should check and grasp the previous operation signal of the inverter compressor 62 and the constant speed compressor 63.

Here, the compressor control unit 300 is used as a basis for determining the operation by the next control what control signal to be transmitted from the compressor control unit 300 to the inverter compressor 62 and the constant speed compressor (63). Judgment is made.

In addition, in the second step S200, the pressure sensing unit 200 determines the current operating pressure of the inverter compressor 62 started as described above by the pressure sensing sensor.

In addition, in the third step S300, when the current operating pressure reaches the upper and lower limits of the target pressure as a result determined in the second step S200, the current operating pressure is greater than the upper limit or less than the lower limit. It determines the recognition (S350).

Then, as a result of the determination, the compressor control unit 300 turns on the constant speed compressor 63 until it reaches the lower limit value of the target pressure (S352), and when the upper limit value of the target pressure is exceeded, the constant speed compressor 63 Turn off (S351).

Then, when the operating pressure reaches the upper and lower predetermined range of the target pressure to control one or more compressors in sequence (S360).

Therefore, the pressure can be reached quickly at the target pressure even with a sudden increase in the load due to the on / off of a plurality of indoor units.

Here, the upper limit of the upper and lower constant range of the target pressure is 120% of the target pressure, the lower limit is 80% of the target pressure, and the target pressure of the compressor is 500 kPa.

On the other hand, the upper and lower limits prevent the phenomenon that the inverter compressor 62 immediately starts to operate at a high frequency and drops to low pressure when the external temperature is low, such as during test operation or in the morning after the product is installed, and the home appliance is warmed up for a long time. The ratio illustrated to prevent standby and normal operation from becoming impossible is not limited to this embodiment.

And, as shown in Figure 6, the control method of the compressor system according to an embodiment of the present invention, when the multi-air conditioner when the cooling operation, the first step of starting by setting the inverter compressor 62 to the initial frequency ( S100, the second step S200 of determining the current operating pressure of the inverter compressor 62 by the pressure sensor, and determining whether the detected operating pressure reaches the upper and lower limits of the compressor target pressure of the air conditioner. It consists of a third step (S300).

In addition, the third step S300 turns on the constant speed compressor 63 until the compressor controller 300 reaches the upper limit of the target pressure as a result of the determination in the second step S200 (S353). When the lower limit value of the target pressure is exceeded, the constant speed compressor 63 is turned off (S354).

Here, the upper limit of the upper and lower constant range of the target pressure is 120% of the target pressure, the lower limit is 80% of the target pressure, and the target pressure of the compressor is 1800 kPa.

After the initial start-up of the inverter compressor 62 through the control of the compressor control unit 300 as described above, controlling the compressor system in response to a rapid load change due to the on / off of the plurality of indoor units To this end, when the current operating pressure does not reach the upper and lower limits of the target pressure, the constant speed compressor 63 is rapidly started until the constant pressure is reached, thereby rapidly reaching the target pressure.

Therefore, before the compressor operating pressure reaches the upper and lower limits of the pressure required for the compressor of the air conditioner, the plurality of constant speed compressors 63 can be started rapidly, thereby increasing the operating performance of the air conditioner.

As described above, the compressor control method of the multi-air conditioner according to the present invention has been described with reference to the illustrated drawings. However, the present invention is not limited by the embodiments and drawings disclosed herein, and the technical idea is within the scope of protection. Can be applied.

Compressor control method of the multi-air conditioner according to the present invention is configured as described above by setting the target pressure and the upper and lower limit value, and continuously turning on the constant speed compressor until reaching the range to quickly change the rapid load change of the indoor unit. By controlling the compressor to be stable, there is an effect that can improve the operating performance and reliability of the air conditioner.

Claims (8)

Multi air conditioner at heating operation, A first step of measuring an operating pressure of the compressor by a pressure sensor as the inverter compressor is driven; A second step of determining whether the operating pressure detected in the first step reaches a vertical range of a target pressure; And a third step of turning on the constant speed compressor until the lower limit value of the target pressure is reached as a result determined in the second step, and turning off the constant speed compressor if the upper limit value of the target pressure is exceeded. Compressor control method of a multi air conditioner, characterized in that the. The method according to claim 1, And controlling the one or more compressors sequentially when the operating pressure reaches the upper and lower predetermined ranges of the target pressure. The method according to claim 1, In the second step, the upper limit of the upper and lower constant range of the target pressure is 120% of the target pressure, the lower limit is 80% of the target pressure compressor control method of the air conditioner. The method according to claim 1, Compressor control method of the multi-air conditioner, characterized in that the target pressure of the compressor is 500kPa. When the air conditioner is air-conditioned, A first step of measuring an operating pressure of the compressor by a pressure sensor as the inverter compressor is driven; A second step of determining whether the operating pressure detected in the first step reaches a vertical range of a target pressure; And a third step of turning on the constant speed compressor until the upper limit value of the target pressure is reached as a result determined in the second step, and turning off the constant speed compressor when the lower limit value of the target pressure is exceeded. Compressor control method of a multi air conditioner, characterized in that the. The method according to claim 5, In the second step, the upper limit value of the upper and lower constant range of the target pressure is 120% of the target pressure, the lower limit value is 80% of the target pressure compressor control method of the air conditioner. The method according to claim 5, And controlling the one or more compressors sequentially when the operating pressure reaches the upper and lower predetermined ranges of the target pressure. The method according to claim 5, Compressor control method of the multi-air conditioner, characterized in that the target pressure of the compressor is 1800kPa.

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