KR100677284B1 - Opening control apparatus for outdoor expansion valve of multi air conditioner and opening control method thereof - Google Patents

Abstract

The present invention relates to an opening degree control device for an outdoor expansion valve of a multi-type air conditioner and an opening degree control method thereof. An apparatus for controlling the opening of an outdoor expansion valve of a multi-type air conditioner according to the present invention includes an inverter compressor and a constant speed compressor, a flow path switching valve for switching a flow path of a refrigerant, an outdoor heat exchanger in which the refrigerant heat exchanges with outdoor air, and a refrigerant. An outdoor unit disposed at one side of the outdoor heat exchanger along a flow direction and having an outdoor expansion valve capable of adjusting an opening degree; An opening control apparatus for an outdoor expansion valve of a multi-type air conditioner including a plurality of indoor units each having an indoor heat exchanger, the apparatus comprising: an outdoor temperature detection unit for detecting an outdoor temperature; An opening amount calculation unit configured to calculate a target opening amount of the outdoor expansion valve based on an outdoor temperature detected by the outdoor temperature detection unit when the constant speed compressor is driven or stopped during a heating operation; And a control unit for controlling the opening degree of the outdoor expansion valve based on a target opening amount calculated by the opening amount calculation unit. Thereby, excessive fluctuation | variation in the superheat degree and the discharge temperature of a compressor at the time of turning on / off of a constant speed type compressor during heating operation can be suppressed.

Description

Opening control device of outdoor expansion valve of multi-type air conditioner and its opening control method {OPENING CONTROL APPARATUS FOR OUTDOOR EXPANSION VALVE OF MULTI AIR CONDITIONER AND OPENING CONTROL METHOD THEREOF}

1 is a block diagram of a conventional multi-type air conditioner,

2 is a view showing a change in the superheat degree and the discharge temperature of the compressor when the constant speed compressor is driven,

3 is a control block diagram of an outdoor expansion valve opening degree control device of a multi-type air conditioner according to an embodiment of the present invention;

4 and 5 are views showing the superheat degree and the discharge temperature of the compressor when the constant speed compressor is driven and stopped, respectively;

6 is a view for explaining the opening degree control method of the outdoor expansion valve of the multi-type air conditioner according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: indoor unit 11: indoor heat exchanger

20: outdoor unit 22a: inverter compressor

22b: constant speed compressor 23: flow path switching valve

31: outdoor heat exchanger 33: outdoor expansion valve

41: control unit 43: outdoor temperature detection unit

45: opening amount calculation unit

The present invention relates to an open position control method of an outdoor expansion valve of a multi-type air conditioner and a control method of the open position thereof, and more particularly, an overheat degree at the time of turning on / off a constant speed compressor during heating operation and an excessive discharge temperature of the compressor. An opening degree control device for an outdoor expansion valve of a multi-type air conditioner and an opening degree control method thereof are provided so as to suppress fluctuations.

1 is a block diagram of a conventional multi-type air conditioner, Figure 2 is a diagram showing the change in the superheat degree and the discharge temperature of the compressor when driving the constant speed type compressor. As shown in FIG. 1, the multi-type air conditioner includes a plurality of indoor units 10 and outdoor units 20.

The indoor unit 10 includes an indoor heat exchanger 11 disposed in each room to cool or heat the refrigerant while contacting the indoor air, and one side of the indoor heat exchanger 11 along the flow direction of the refrigerant. It is provided with the indoor expansion valve (13) arranged in the.

The outdoor unit 20 includes a plurality of compressors 21 for compressing a refrigerant, a flow path switching valve 23 installed to switch the flow path of the coolant, and an outdoor heat exchanger 31 formed to exchange heat with the outdoor air. Equipped with.

One side of the outdoor heat exchanger 31 is provided with an outdoor expansion valve 33 and a check valve 35 in which the refrigerant is decompressed and expanded during heating, and on one side of the outdoor unit 20, an indoor unit ( The service valve 37 is installed to be connected to each other in communication with 10).

On the other hand, the compressor 21 is composed of an inverter compressor 22a capable of variable speed so that the refrigerant can be supplied corresponding to the load of the indoor unit 10, and a constant speed compressor 22b. Normally, the constant speed compressor 22b has a smaller capacity than the maximum frequency capacity of the inverter compressor 22a, for example, when the inverter compressor 22a is configured to 10 horsepower, the constant speed compressor 22b has a capacity of about 7 horsepower. It is formed to have. At the suction side of the inverter compressor 22a and the constant speed type compressor 22b, an accumulator 25 is provided to provide a refrigerant in a gaseous state.

By this configuration, when the heating operation is started, the flow path switching valve 23 switches the flow path so that the refrigerant compressed in the compressor 21 can flow to the indoor unit 10 in which the heating operation is performed, and the corresponding indoor unit 10 The refrigerant introduced into the indoor heat exchanger 11 performs a heating operation while exchanging heat with indoor air.

The refrigerant having a heating action flows to the outdoor unit 20 and expands under reduced pressure while passing through the outdoor expansion valve 33, and absorbs latent heat from the outdoor heat exchanger 31 to evaporate. The refrigerant passing through the outdoor heat exchanger (31) flows into the accumulator (25), and the gaseous refrigerant in the accumulator (25) is sucked into the compressor (21) to perform heating while repeating the compression and discharge process. do.

However, in such a conventional multi-type air conditioner, the outdoor expansion valve 33 is configured to control the superheat to prevent the liquid compression of the compressor 21, and to turn on / off the constant speed compressor 22b when the load is changed. Since there is a sudden change in the superheat degree and the discharge temperature of the compressor 21 when the constant speed compressor 22b is turned on and off, there is a problem that the service life of the compressor 21 is shortened. In particular, when the constant speed compressor 22b is driven in a state where the outside air temperature is low, as shown in FIG. 2, the superheat degree and the discharge temperature of the compressor 21 increase rapidly, thereby forcing the deterioration of the compressor 21. There is a problem that it is facilitated.

Accordingly, an object of the present invention is to provide an opening control device for an outdoor expansion valve of a multi-type air conditioner that can suppress excessive fluctuations in the superheat degree and the discharge temperature of a compressor during on / off of a constant speed type compressor during heating operation. It is to provide an opening control method.

The object of the present invention is to provide an inverter compressor and a constant speed compressor, a flow path switching valve for switching a flow path of a coolant, an outdoor heat exchanger in which the coolant exchanges heat with outdoor air, and a flow path of the coolant along the flow direction of the coolant. An outdoor unit having an outdoor expansion valve disposed at one side and capable of adjusting an opening degree; An opening control apparatus for an outdoor expansion valve of a multi-type air conditioner including a plurality of indoor units each having an indoor heat exchanger, the apparatus comprising: an outdoor temperature detection unit for detecting an outdoor temperature; An opening amount calculation unit for calculating a target opening amount of the outdoor expansion valve based on an outdoor temperature detected by the outdoor temperature detector when the constant speed compressor is driven or stopped during a heating operation; And a control unit for controlling the opening degree of the outdoor expansion valve on the basis of the target opening amount calculated by the opening amount calculation unit.

Here, the opening amount calculation unit, when the constant speed compressor is driven, the change amount calculated by multiplying the opening degree of the outdoor expansion valve by the influence of the correction constant and the outdoor temperature before driving the constant speed compressor, the constant speed compressor Preferably, the first target opening amount is calculated in addition to the opening amount of the outdoor expansion valve.

The control unit controls the opening amount calculation unit to stop the driving of the constant speed type compressor so that the second target opening amount of the outdoor expansion valve is calculated based on the outdoor temperature detected by the outdoor temperature detector, and the calculated second It is effective to control the opening degree of the outdoor expansion valve based on the target opening amount.

The opening amount calculation unit may include a change amount calculated by multiplying an opening degree of the outdoor expansion valve by the influence of the constant constant and the outdoor temperature when the constant speed compressor is stopped and the influence of the constant temperature compressor. It is preferable to configure so as to calculate the second target opening amount by subtracting from the opening amount of the outdoor expansion valve during driving.

The correction constant is 0.15, the influence is 0.8 when the outdoor temperature is 15 ℃ or more, 0.9 for 10 to 15 ℃, 1 for 5 to 10 ℃, 1.2 for 0 to 5 ℃, 0 to It is effective at 1.3 for -5 ° C and 1.5 for -5 ° C or less.

On the other hand, according to another field of the present invention, an inverter compressor and a constant speed compressor, a flow path switching valve for switching the flow path of the refrigerant, an outdoor heat exchanger in which the refrigerant heat exchanges with the outdoor air, and the outdoor heat exchanger along the flow direction of the refrigerant An outdoor unit disposed at one side of the outdoor unit and having an outdoor expansion valve; A method of controlling the opening degree of an outdoor expansion valve of a multi-type air conditioner including a plurality of indoor units each having an indoor heat exchanger, the method comprising: detecting an outdoor temperature when the constant speed compressor is driven or stopped during a heating operation; Calculating a target opening amount of the outdoor expansion valve based on the detected outdoor temperature; An opening degree control method for an outdoor expansion valve of a multi-type air conditioner is provided, comprising controlling the opening degree of the outdoor expansion valve based on the target opening amount.

Here, the target opening amount is the constant speed compressor when the constant speed compressor is driven, the amount of change calculated by multiplying the opening degree of the outdoor expansion valve by the influence of the correction constant and the outdoor temperature before driving the constant speed compressor. It is preferable to include a first target opening amount calculated in addition to the opening amount of the outdoor expansion valve before the operation of the.

The target opening amount is a change amount calculated by multiplying the opening degree of the outdoor expansion valve by the influence of the constant constant and the outdoor temperature when the constant speed compressor stops driving and when the constant speed compressor is driven, of the constant speed compressor. It is effective to include the second target opening amount calculated by subtracting from the opening amount of the outdoor expansion valve during driving.

The correction constant is 0.15, the influence is 0.8 when the outdoor temperature is 15 ℃ or more, 0.9 for 10 to 15 ℃, 1 for 5 to 10 ℃, 1.2 for 0 to 5 ℃, 0 It is preferable that it is 1.3 when it is --5 degreeC, and it is 1.5 when it is -5 degreeC or less.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

3 is a control block diagram of an outdoor expansion valve opening degree control device of a multi-type air conditioner according to an embodiment of the present invention, Figures 4 and 5 are the superheat diagram when the constant speed compressor is driven and stopped, respectively. 6 is a view illustrating a discharge temperature, and FIG. 6 is a view for explaining an opening degree control method of an outdoor expansion valve of a multi-type air conditioner according to an exemplary embodiment of the present invention. The same and equivalent parts as those described above and shown in the drawings will be described with reference to the same reference numerals for convenience of description. As shown in FIG. 3, the opening degree control device for the outdoor expansion valve of the multi-type air conditioner includes an outdoor temperature detection unit 43 for detecting an outdoor temperature and a constant speed compressor 22b being driven or stopped during heating operation. The opening amount calculation unit 45 for calculating the target opening amount of the outdoor expansion valve 33 based on the outdoor temperature detected by the outdoor time temperature detection unit 43 and the opening amount calculation unit 45; The control part 41 which controls the opening degree of the outdoor expansion valve 33 based on 1 target opening amount is comprised.

The controller 41 includes an opening amount calculation unit 45 to calculate a target opening amount of the outdoor expansion valve 33 when the constant speed compressor 22b is driven and stopped based on the outdoor temperature. It is implemented in the form of a built-in microcomputer, the control unit 41 is electrically connected to the outdoor expansion valve 33 and the outdoor temperature detector 43 so as to control the outdoor expansion valve 33 based on the calculated target opening amount. It is connected.

The opening degree control method of the outdoor expansion valve 33 of the present multi-type air conditioner having such a device feature will be described with reference to FIG.

When the heating operation of each indoor unit 10 is started, the inverter compressor 22a is first driven, and the controller 41 controls the outdoor expansion valve 33 so as to have a target superheat. When the load of each indoor unit 10 is calculated (S30), the controller 41 determines whether the constant speed compressor 22b is driven (S40).

When it is determined that the constant speed compressor 22b is driven, the controller 41 causes the outdoor temperature to be detected by the outdoor temperature detector 43 (S50), and controls the opening amount calculation unit 45 to control the outdoor expansion valve 33. The current opening amount of the is calculated (S60). The opening amount calculation unit 45 calculates the first target opening amount of the outdoor expansion valve 33 according to Equation 1 below based on the detected outdoor temperature and the current opening amount of the outdoor expansion valve 33 (S70). .

O _T1i = O _Ci + O _Vi

Here, O _Ci is the current opening amount of the outdoor expansion valve 33, and O _Vi is the amount of change in the opening degree of the outdoor expansion valve 33. The amount of change in the opening degree of the outdoor expansion valve 33 is calculated by Equation 2 below.

O _Vi = O _Ci × C × I _T

Here, C is 0.15 as the correction constant, I _T is the influence chart according to the outdoor temperature as shown in Table 1 below.

Outdoor temperature Impact 15 ℃ or more 0.8 10 ~ 15 ℃ 0.9 5 ~ 10 ℃ One 0 ~ 5 ℃ 1.2 -5 ~ 0 ℃ 1.3 -5 ℃ or less 1.5

Next, when the first target opening amount is calculated by the opening amount calculation unit 45, the controller 41 drives the constant speed type compressor 22b and opens the outdoor expansion valve 33 according to the calculated first target opening amount. Control (S80). When the outdoor expansion valve 33 is controlled by the first target opening amount when the constant speed compressor 22b is driven as described above, a sudden change in discharge temperature and superheat degree of the compressor 21 is suppressed as shown in FIG. 4. It can be seen.

On the other hand, when there is no change in load during heating operation, the controller 41 calculates the degree of superheat and controls the outdoor expansion valve 33 to be the target superheat (S110). It is determined whether the driving stop condition of 22b) is performed (S100). If it is not the driving stop condition of the constant speed compressor 22b, the outdoor expansion valve 33 is controlled to reach the target superheat (S110).

When the constant speed compressor 22b stops driving, the controller 41 causes the outdoor temperature to be detected by the outdoor temperature detector 43 (S120) and the outdoor expansion valve 33 by the opening amount calculation unit 45. The current opening amount of the is calculated (S130). When the outdoor temperature and the current opening amount are calculated, the opening amount calculation unit 45 calculates the second target opening amount by using Equation 3 below by subtracting the change amount of the outdoor expansion valve 33 from the current opening amount (S140).

O _T2i = O _Ci -O _Vi

Here, O _Ci is the current opening amount of the outdoor expansion valve 33, and O _Vi is the amount of change in the opening degree of the outdoor expansion valve 33. The amount of change in the opening degree of the outdoor expansion valve 33 is calculated by the above expression (2) and the outdoor temperature influence is as described in Table 1 above.

When the second target opening amount is calculated, the control unit 41 stops the constant speed type compressor 22b and controls the opening degree of the outdoor expansion valve 33 using the calculated second target opening amount (S150). If no (S160), the above-described step S30 to S160 is repeated. When the outdoor expansion valve 33 is controlled by the second target opening amount when the constant speed compressor 22b is stopped, as shown in FIG. 5, the discharge temperature and the superheat of the compressor 21 are stable without a sudden change. It can be seen that the change.

As described above, according to the present invention, the outdoor temperature detection unit for detecting the outdoor temperature; An opening amount calculation unit for calculating a target opening amount of the outdoor expansion valve based on the outdoor temperature detected by the outdoor temperature detection unit when the constant speed compressor is driven or stopped during the heating operation; By including a control unit for controlling the opening degree of the outdoor expansion valve based on the target opening amount calculated by the opening amount calculation unit, the superheat degree and the discharge temperature of the compressor excessively fluctuate during on / off of the constant speed type compressor during heating operation An opening control device for an outdoor expansion valve of a multi-type air conditioner which can be prevented from being provided is provided.

In addition, according to the present invention, the step of detecting the outdoor temperature when the drive or stop driving the constant speed type compressor during heating operation; Calculating a target opening amount of the outdoor expansion valve based on the detected outdoor temperature; By controlling the opening degree of the outdoor expansion valve on the basis of the target opening amount, it is possible to suppress excessive fluctuations in the superheat degree and the discharge temperature of the compressor during on / off of the constant speed type compressor during heating operation An opening control method of an outdoor expansion valve of a multi-type air conditioner is provided.

Claims (7)

An inverter compressor and a constant speed compressor, a flow path switching valve for switching a refrigerant flow path, an outdoor heat exchanger in which the refrigerant is heat-exchanged with outdoor air, and an outdoor unit which is arranged on one side of the outdoor heat exchanger along the flow direction of the refrigerant and whose opening degree is adjustable An outdoor unit having an expansion valve; In the opening control device of the outdoor expansion valve of the multi-type air conditioner including a plurality of indoor units each provided with an indoor heat exchanger, An outdoor temperature detector detecting an outdoor temperature; An opening amount calculation unit configured to calculate a target opening amount of the outdoor expansion valve based on an outdoor temperature detected by the outdoor temperature detection unit when the constant speed compressor is driven or stopped during a heating operation; And a control unit for controlling the opening degree of the outdoor expansion valve based on a target opening amount calculated by the opening amount calculation unit. The method of claim 1, The opening amount calculating unit may drive the constant speed compressor by a change amount calculated by multiplying the opening degree of the outdoor expansion valve by the influence of the correction constant and the outdoor temperature before driving the constant speed compressor. And a first target opening amount in addition to the opening amount of all the outdoor expansion valves. delete The method according to claim 1 or 2, The opening amount calculation unit may include a change amount calculated by multiplying an opening degree of the outdoor expansion valve by the influence of the constant constant and the outdoor temperature when the constant speed compressor is stopped and the influence of the constant temperature compressor. Opening control device of the multi-type air conditioner, characterized in that for calculating the second target opening amount by subtracting from the opening amount of the outdoor expansion valve. An inverter compressor and a constant speed compressor, a flow path switching valve for switching a refrigerant flow path, an outdoor heat exchanger in which the refrigerant is heat-exchanged with outdoor air, and an outdoor unit which is arranged on one side of the outdoor heat exchanger along the flow direction of the refrigerant and whose opening degree is adjustable An outdoor unit having an expansion valve; In the opening degree control method of the outdoor expansion valve of the multi-type air conditioner including a plurality of indoor units each provided with an indoor heat exchanger, Detecting an outdoor temperature when the constant speed compressor is driven or stopped during a heating operation; Calculating a target opening amount of the outdoor expansion valve based on the detected outdoor temperature; And controlling the opening degree of the outdoor expansion valve based on the target opening amount. The method of claim 5, The target opening amount is the drive amount of the constant speed compressor, when the constant speed compressor is driven, the amount of change calculated by multiplying the opening degree of the outdoor expansion valve by the influence of the correction constant and the outdoor temperature before driving the constant speed compressor. And a first target opening amount calculated in addition to the opening amount of all the outdoor expansion valves. The method according to claim 5 or 6, The target opening amount is a change amount calculated by multiplying the opening degree of the outdoor expansion valve by the influence of the constant constant and the outdoor temperature when the constant speed compressor stops driving and when the constant speed compressor is driven, of the constant speed compressor. And a second target opening amount calculated by subtracting from the opening amount of the outdoor expansion valve during the driving.

Images