JP2522423B2 - Operation control device for air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an operation control device for an air conditioner capable of switching between cooling operation and heating operation, and particularly relates to a capacity adjustment measure at the time of operation switching. is there.

(Prior Art) Generally, an operation control device in an air conditioner has a plurality of indoor units that control an indoor unit to an outdoor control unit that controls an outdoor unit, as disclosed in JP-A-59-210249. There is a configuration in which a control unit is connected via a signal line, a remote controller is connected to the indoor control unit, and a centralized controller is connected to the outdoor control unit.

The outdoor control unit transmits and receives various control signals such as operation signals and mode signals to and from each indoor control unit, and the outdoor control unit transmits and receives control signals to and from a centralized controller. The air conditioning operation is controlled by controlling the air conditioner and each electric expansion valve.

(Problem to be Solved by the Invention) In the above-described operation control device for an air conditioner, the central controller is provided with an operation mode switch to switch the air conditioning operation of the indoor unit between the cooling operation and the heating operation. On the other hand, the indoor control unit and the outdoor control unit control the operating capacity based on the suction temperature of the indoor unit during the cooling and heating operations.

However, conventionally, when the air conditioning operation is switched by the centralized controller, the normal operation capability control is performed at the same time as the switching, so that there is a problem that the user feels uncomfortable. In other words, when switching from the cooling operation to the heating operation, the hot air is blown out instantly from the state where the cool air is blowing, and when the heating operation is switched to the cooling operation, the warm air is blown out from the state. There was a problem that the cool air would be blown out instantly and the comfort at the time of this operation change would be significantly impaired.

The present invention has been made in view of the above points, and an object of the present invention is to improve comfort when switching between air conditioning operations.

(Means for Solving the Problems) In order to achieve the above-mentioned object, means taken by the present invention are
The operation capacity is controlled when the air conditioning operation is switched.

Specifically, as shown in FIG. 1, in the means taken by the invention according to claim 1, first, a heat exchanger and an electrically-operated expansion valve (51) having an adjustable opening for controlling a refrigerant flow rate are provided. It is premised on an operation control device for an air conditioner provided with an air conditioning unit (B) that performs air conditioning operations for cooling and heating and a control unit (8) that controls the air conditioning operations of the air conditioning unit (B).

An operation switching means (81) for outputting a switching signal for switching the air conditioning operation of the air conditioning unit (B) between the cooling operation and the heating operation is provided. In addition, at the time of outputting the switching signal by the operation switching means (81), the electric expansion valve (51)
A capacity suppressing means (11) for outputting a capacity suppressing signal for decreasing the opening degree of is smaller than the control opening degree during the normal operation is provided.

(Operation) With the above configuration, in the invention according to claim 1, the air conditioning unit (B) performs the air conditioning operation of the cooling operation and the heating operation, and the control unit (8) controls the air conditioning operation of the air conditioning unit (B). For example, the operating capacity is adjusted by controlling the opening of the electric expansion valve (51).

On the other hand, when the operation switching means (81) outputs a switching signal, the air conditioning operation of the air conditioning unit (B) is switched from the cooling operation to the heating operation, and vice versa. When this switching signal is output, that is,
At the time of switching the air conditioning operation, the capacity suppressing means (11)
A capacity suppression signal is output, and the operation capacity of the air conditioning unit (B) is suppressed below the operation capacity during normal operation.

Specifically, the opening degree of the electric expansion valve (51) is controlled to be smaller than the control opening degree during the normal operation by the capacity suppressing means (11), and the refrigerant flow rate is suppressed. As a result, when the operation is switched, a cool air that is slightly warmer than the cool air during the normal cooling operation or a warm air that is slightly cooler than the warm air during the normal heating operation is blown out.

(Effect of the invention) Therefore, according to the invention described in claim 1, since the operating capacity is suppressed when the air conditioning operation is switched, it is possible to reduce the temperature difference between the cold air and the warm air when the operation is switched. Therefore, the user does not suddenly receive cold air or hot air, and the comfort can be significantly improved.
In particular, in the case where the cooling operation and the heating operation are automatically switched, the air temperature gradually changes, and the comfort can be improved.

In particular, since the opening of the electric expansion valve (51) is made small, the amount of refrigerant flow is suppressed, and the operating capacity can be accurately suppressed and controlled, so the comfort at the time of switching the operation is reliably improved. Can be made.

(Example) Hereinafter, the Example of this invention is described in detail based on drawing.

As shown in FIG. 2, (X) is a multi-type in which a plurality of (five in the drawing) indoor units (B, B,...) Are connected in parallel to one outdoor unit (A). Air conditioner.

The outdoor unit (A) includes a compressor (1) and two outdoor heat exchangers (2a, 2b), and the compressor (1) is a first compressor (the capacity of which is controlled by an inverter ( 1a) and a second compressor (1b) whose capacity is controlled by an unload mechanism, and the discharge side of the first compressor (1a) is connected to the second compressor (1b) via an oil separator (1d). ) Is connected to the high pressure gas line (31) of the refrigerant circuit (3) via the one-way valve (1c) and the oil separator (1e), and the suction side is connected to the low pressure gas line (32). . Further, return pipes (1f, 1g) of the oil separators (1d, 1e) are connected to the suction side of the compressor (1), and an oil equalizing pipe (1h) is connected between the compressors (1a, 1b). ) Is provided.

The outdoor heat exchangers (2a, 2b) are provided in parallel with the compressor (1), and one end of each of the outdoor heat exchangers (2a, 2b) is a four-way switching valve. (21a, 21b)
The high pressure gas line (31) and the low pressure gas line (32) are switchably connected to each other via a gas pipe (22a, 22b) provided with the other outdoor heat exchangers (2a, 2b). At the end, the wave tubes (33a, 33b) of the liquid line (33) in the refrigerant circuit (3)
Is connected.

When the outdoor heat exchangers (2a, 2b) function as condensers, the four-way switching valves (21a, 21b) are switched to solid lines in the figure, and the gas pipes (22a, 22b) are connected to the high pressure gas line. (3
1), and conversely, when each outdoor heat exchanger (2a, 2b) functions as an evaporator, it is switched to the broken line in the figure and the gas pipe (22a,
22b) is configured to communicate with the low pressure gas line (32). One port of the four-way switching valve (21a, 21b) has a connection pipe (24) provided with a capillary (23a, 23b).
It is connected to the gas pipes (22a, 22b) between the four-way switching valve (21a, 21b) and the low pressure gas line (32) via a, 24b).

Further, a gas pipe (22a, 22
A one-way valve (4) is provided downstream of the connection part of b), and an accumulator (41) is provided downstream of the connection part of the gas pipes (22a, 22b) in the low pressure gas line (32). Between the gas lines (31, 32), the pressure equalizing bypass passage (4
2) is connected. The equalizing bypass passage (42) is provided with an on-off valve (42a) and a flow control capillary (42b), and has one end connected to a gas pipe (22) in the high-pressure gas line (31).
a, 22b) and the compressor (1), and the other end is connected between the connection part of the gas pipes (22a, 22b) in the low pressure gas line (32) and the accumulator (41). There is.

In addition, each of the wave tubes (33a, 33a) in the liquid line (33) is
b) is connected to the receiver (43) to combine the liquid refrigerant,
The main liquid pipe (33) of the liquid line (33) is connected to the receiver (43).
c) is connected. Further, an outdoor electric expansion valve (25a, 25b) is provided in each of the liquid pipes (33a, 33b), and the outdoor electric expansion valve (25a, 25b) is an outdoor heat exchanger (2a, 2b). Is configured to reduce the pressure of the liquid refrigerant when it functions as an evaporator, and adjust the flow rate of the liquid refrigerant when it functions as a condenser.

In addition, (26) is an outdoor fan arranged close to the outdoor heat exchangers (2a, 2b), and (44) is a low-pressure gas line (32).
And a main heat pipe (33c).

One end of a hot gas bypass line (45) is connected to a downstream side of the one-way valve (4) in the high-pressure gas line (31), and the other end of the hot gas bypass line (45) is connected to a receiver (43). And a hot gas on-off valve (45a) and a capillary (45b) for adjusting the flow rate of the hot gas. The hot gas on-off valve (45a) is opened to guide the hot gas to the receiver (43) when the outside air temperature becomes equal to or lower than a predetermined temperature set during the cooling operation of the indoor unit (B), The line (33) is kept at a predetermined pressure.

On the other hand, each of the high pressure gas line (31), the low pressure gas line (32) and the main liquid pipe (33) are arranged to extend to the inside of the room, and each high pressure branch is provided via a flow divider (31a, 32a, 33d). Pipes (31b, 31b, ...), Low-pressure branch pipes (32b, 32b, ...) And liquid branch pipes (33e, 33e, ...)
33e) is connected to each indoor unit (B, B, ...).

Each of the indoor units (B, B,...) Includes an indoor heat exchanger (5) and an indoor electric expansion valve (51). The indoor units (B, B, ...) Are configured to be switchable between cooling operation and heating operation, and the three indoor units (B, B, ...) Are configured to be in the same operation mode. Is divided into three sections (D1, D2, D3),
One indoor unit (B) is provided in the first and second sections (D1, D2), and three indoor units (B) are provided in parallel in the third section (D3).

A liquid branch pipe (33e) is provided at one end of the indoor unit (B) in the first and second sections (D1, D2) via the indoor electric expansion valve (51), and a gas pipe (5a) is provided at the other end. The low pressure branch pipe (32b) and the high pressure branch pipe (31b) are connected to each other via the indoor electric expansion valve (51) and the liquid pipe (5b) at one end of the indoor unit (B) in the third section (D3). And a liquid branch pipe (33e) via the flow divider (58a), and a low pressure branch pipe (32b) and a high pressure branch pipe (31b) at the other end via the gas pipe (5a) and the flow divider (58b). It is connected.

Opening / closing valves (52, 53) are provided at each end of the high-pressure branch pipe (31b) and the low-pressure branch pipe (32b), and the open / close valves (52, 53) are controlled to open / close. The inner heat exchanger (5) is configured to be switchably connected to a high-pressure gas line (31) and a low-pressure gas line (32), and when the indoor heat exchanger (5) functions as an evaporator (cooling). At low pressure side on-off valve (53)
However, when functioning as a condenser (during heating), the high-pressure side on-off valves (52) are each opened.

Further, the liquid branch pipe (33) on the indoor unit (B, B, ...) side
A low-pressure bypass passage (54) is connected to e), and the low-pressure bypass passage (54) is connected to the on-off valve (5) in the low-pressure branch pipe (32b).
3), a bypass valve (54a) and a capillary (54b) are interposed, and a pipe heat exchanger (54c) is formed between the pipe and the liquid branch pipe (33e). The liquid refrigerant flowing out of the inner heat exchanger (5) is prevented from being flushed.

Further, the on-off valve (52) in the high pressure branch pipe (31b)
A high-pressure bypass passage (55) is connected to the upstream side of the high-pressure bypass passage (55), and the high-pressure bypass passage (55) is connected to the gas pipe (5a) and includes a capillary (55a) for flow rate adjustment,
It is configured to bypass the condensed liquid accumulated in the high pressure branch pipe (31b) and the like during cooling.

Then, each of the on-off valves (52, 53) and both bypass passages (5
4,55) are housed together in the kit and the branch unit (5
6) is formed, while the compressor (1), the outdoor heat exchangers (2a, 2b), and the indoor heat exchangers (5, 5,...) Are a high pressure gas line (31) and a low pressure gas line ( 32) and liquid line (3
3) to constitute the refrigerant circuit (3).

Incidentally, reference numeral (57) denotes an indoor fan arranged close to the indoor heat exchanger (5).

In the refrigerant circuit (3) described above, when the indoor units (B, B, ...) Are cooled, the four-way switching valves (21a, 21b) of the outdoor unit (A) are switched to the solid line in FIG. While connecting the pipes (22a, 22b) to the high pressure gas line (31), the branch unit (56, 56, ...)
2) Close, open the low pressure side open / close valve (53), and open the gas pipe (5a)
To the low pressure branch pipe (32b).

In this state, the high-pressure gas refrigerant discharged from the compressor (1) flows into each outdoor heat exchanger (2a, 2b) and condenses,
The condensed liquid refrigerant flows through the liquid line (33) to each indoor unit (B, B,...), And the indoor electric expansion valves (51, 51,...)
, And evaporate in each indoor heat exchanger (5,5,…)
It flows through the low pressure gas line (32) and returns to the compressor (1).

On the other hand, when the indoor units (B, B, ...) Are heated, the refrigerant flows in the opposite direction to that during cooling, and the four-way switching valve (21a, 21b) of the outdoor unit (A) is switched to the broken line in FIG. The high pressure side opening / closing valve (52) is opened, the low pressure side opening / closing valve (53) is closed, and the refrigerant is condensed from the high pressure gas line (31) in the indoor heat exchanger (5) and flows through the liquid line (33). , Outdoor electric expansion valve (25a,
It expands in 25b), evaporates in the outdoor heat exchangers (2a, 2b), and returns to the compressor (1).

Then, during the cooling operation, for example, both open / close valves (52, 53) in one branch unit (56) are switched to the heating operation, and conversely, during the heating operation, for example, one branch unit ( By switching both on-off valves (52, 53) in 56) to perform cooling operation, so-called simultaneous cooling and heating operation is performed. At this time, the liquid refrigerant flowing out of the indoor unit (B) in the heating operation is joined by the diverter (33d) in the liquid line (33), and then flows into the indoor unit (B) in the cooling operation, and evaporates to the low-pressure gas line. Returning to the compressor (1) from (32).

During this simultaneous cooling and heating operation, the two outdoor heat exchangers (2a, 2b) operate as evaporators or condensers according to the indoor load, and one is operated, and the other is operated. Will be stopped.

Further, various sensors are disposed in the refrigerant circuit (3), (Th1) is a liquid temperature sensor for detecting the liquid refrigerant temperature of the indoor unit (B), and (Th2) is a gas refrigerant of the indoor unit (B). A gas temperature sensor that detects the temperature, (Th3) is a room temperature sensor that detects the intake air temperature of the indoor fan (57), and (Th3)
4) is a liquid temperature sensor that detects the temperature of the liquid refrigerant on the outdoor heat exchanger (2a, 2b) side, and (Th5) is a gas temperature that detects the temperature of the discharged gas refrigerant on the outdoor heat exchanger (2a, 2b) side. A sensor, (Th6) is an outside air temperature sensor which is an outside air temperature detecting means for detecting the outside air temperature, (Th7) is a discharge gas temperature sensor for detecting the discharge gas refrigerant temperature of the compressor (1), and (HPS) is a compressor ( 1) is a high pressure sensor for detecting the pressure of the discharged gas refrigerant, and (LPS) is a low pressure sensor for detecting the pressure of the suction gas refrigerant of the compressor (1).

Next, FIG. 3 is a system configuration diagram showing a control system of the air conditioner (X), which is an outdoor control unit for controlling the outdoor unit (A) by controlling the capacity of the compressor (1) and the like. (6), a branch control unit (7, 7, ...) For controlling the branch unit (56, 56, ...) By controlling the opening / closing valve (52, 53), and the indoor electric expansion valve (51). The indoor control unit (8,8, ...) which controls the opening degree and controls the indoor unit (B, B, ...) Is connected via a signal line (10). The branch control unit (7) forms an external control unit including the outdoor control unit (6).

Each of the control units (6, 7, 8) has three levels (C1,
The outdoor control unit (6) is on the first floor (C1) and the branch control unit (7,7,7) is on the second floor (C2).
…) Has five indoor control units (8, 8) on the third level (C3).
8, ...).

Further, the indoor control units (8, 8,
…) Is divided into three sections (D1, D2, D3) and the indoor units (B, B,
…) Corresponding to the first and second sections (D1, D2)
The indoor control unit (8,8) destined for one unit belongs to the third section (D3), and the three indoor control units (8,8, ...)

In addition, the branch control unit (7, 7,
…) To the outdoor control unit (6), the indoor control units (8,,) of each section (D1, D2, ...) in the third level (C3).
8) are connected to the respective branch control units (7). Independent transmission circuits (E, E, ...) Are formed between the control units (6) to (8) connected between the layers (C1) to (C3).

In each of the transmission circuits (E, E, ...), the outdoor control unit (6) is connected between the first layer (C1) and the second layer (C2).
The branch control unit (7,7) is set as the secondary station in the next station, and the branch control unit (7,7) becomes the primary station between the second layer (C2) and the third layer (C3). , Indoor control unit (8,
8, ...) is set as the secondary station and sends and receives control signals for each transmission circuit (E, E, ...), and the branch control unit (7) is used between the outdoor and indoor control units (6,8). It is configured to perform data transfer.

Each of the indoor control units (8, 8,...) Is configured as a terminal, and a remote controller (9, 9,...) Is connected. The remote control (9,9, ...) is connected to the indoor control unit (8,
8, ...) are divided into three groups for each section (D1, D2, D3), and group control is performed, and operation signals such as operation signals are input.

Further, the remote control (9) has an operation switching button (91).
The operation switching button (91) is provided for each section (D1, D2, D3) to select whether the air conditioning operation of the indoor unit (B) is cooling operation, heating operation, blow operation or automatic operation. To output the mode signal from the indoor control unit (8) of the master unit via the branch control unit (7) to the indoor control unit (8) of the slave unit and the outdoor control unit ( 6) to be sent.

Furthermore, when the indoor control unit (8) of the master unit to which the remote controller (9) is connected receives an automatic operation mode signal from the operation switching button (91) of the remote controller (9), the indoor unit (B) The operation switching means (81) for automatically switching the air conditioning operation between the cooling operation and the heating operation is a CPU (not shown).
It is configured. The operation switching means (81) performs heating operation when the intake air temperature detected by the room temperature sensor (Th3) reaches 21 ° C. during cooling operation, and during cooling operation.
When the temperature reaches 27 ° C., a switching signal for switching the indoor unit (B) to the cooling operation is output. The branch control unit (7) receives this switching signal and the branch control unit (7) opens and closes the open / close valves (52, 53) of the branch unit (56).
Is configured to be controlled.

Furthermore, each indoor control unit (8) controls the opening degree of the indoor electric expansion valve (51) based on the detected intake air temperature of the room temperature sensor (Th3) and controls the operating capacity of the indoor unit (B). At the same time, as a feature of the present invention, when the operation switching means (81) outputs a switching signal, the opening degree of the indoor electric expansion valve (51) is made smaller than the control opening degree during normal operation to suppress the operating capacity. Is configured.

Therefore, the configuration and operation of the opening control of the indoor electric expansion valve (51) in the indoor control unit (8) will be described based on the control flow of FIG.

First, after starting, in step ST1, a capacity suppression value S, which will be described later, is set to zero, then the process proceeds to step ST2, and it is determined whether or not the cooling operation is currently switched. Then, the operation switching means (81) outputs a switching signal.
Therefore, first, the case where the heating operation is switched to the cooling operation will be described.

When switching to this cooling operation, the determination in step ST2 is YES, the process proceeds to step ST3, and it is determined whether or not the heating thermo-on flag DTOF is set. This heating thermo-on flag DTOF is set so that it is turned on immediately before switching during heating operation before switching to cooling operation.
If DTOF is reset, the process proceeds from step ST3 to step ST4. If the heating thermo-on flag DTOF is set, the process proceeds from step ST3 to step ST5 to step ST4.

Then, when the heating thermo-on flag DTOF is set, since it is in a state of performing heat exchange and blowing hot air up to immediately before switching, in the step ST5,
The ability suppression means (11), which is a feature of the present invention, has an ability suppression value S
Is set and the capability suppression signal is output. The capacity suppression value S is, as shown in the following equation, S = Tcon-Ts ... Tcon: average value of intake air temperature detected by the room temperature sensor (Th3) Ts: set temperature.

In addition, between the steps ST3 and ST5 and the step ST4, another control operation is performed, and the control operation is omitted.

Subsequently, in step ST4, it is determined whether or not the cooling operation is being performed, and since the cooling operation is currently being performed, the process proceeds to step ST6, the maximum control target value SCHmax is calculated, and the maximum control target value SCHmax is the cooling operation time. Is the maximum value of the superheat value, and as shown in the following formula, SCHmax = Ta−T ₂ ...... Ta: Suction air temperature detected by the room temperature sensor (Th3) T ₂ : Detected by the liquid temperature sensor (Th1) It is the temperature of the liquid refrigerant to be used.

Then, the process proceeds from step ST6 to step ST7, and the constant A is calculated, and the constant A is expressed by the following equation: A = (SCHmax-SCHmin). (Tcon-Ts-S) / 4 ... SCHmin: minimum control It is a target value, and is a difference in inlet and outlet temperatures of the refrigerant in the indoor heat exchanger (5) (usually 5 ° C.). This constant A becomes zero when the capacity suppression value S (see step ST5) is set at the time of switching the operation, while a predetermined value is calculated at the time of normal operation.

After that, the process proceeds from step ST7 to step ST8, it is determined whether or not the cooling operation is performed, and since the cooling operation is currently being performed, the process proceeds to step ST9 and the control target value SCHs is calculated,
The control target value SCHs is a target superheat value during the cooling operation, and SCHs = SCHmax-A ... As shown in the following equation.

Subsequently, after performing other control operation from the step ST9, the process proceeds to step ST10, and it is determined whether or not the cooling operation is performed.
Since the cooling operation is currently being performed, the process proceeds to step ST11, and the current control value SCH is calculated. The control value SCH is a current superheat values, as shown in the following _{equation, SCH = T 3 -T 2 ......} T 3: a gas refrigerant temperature gas temperature sensor (Th2) is detected.

Subsequently, the process proceeds from step ST11 to step ST12, and it is determined whether the cooling operation is being performed. Since the cooling operation is currently being performed, the process proceeds to step ST13, the constant B is set to 3, and the process proceeds to step ST14. In this step ST15, a change value ΔEV of the indoor electric expansion valve (51) is calculated, and this change value ΔEV is ΔEV = B · (SCH-SCHs), ... After that, the routine proceeds to Step ST15, the opening EV of the indoor electric expansion valve (51) shown in the following equation is calculated, and EV = EV + ΔEV.

That is, at the time of switching the cooling operation, the capacity suppression value S
Is set, the constant A in step ST7, which is set to a predetermined value during normal cooling operation, becomes zero, and step ST9
Since the control target value SCHs of becomes larger than that during normal cooling operation, and the control target value SCHs becomes negative in step ST14,
The change value ΔEV becomes negative, and the opening degree of the indoor electric valve (51) is controlled to be small.

As a result, the amount of refrigerant flowing through the indoor heat exchanger (5) is suppressed, and cold air having a temperature higher than the temperature of the cold air blown during the normal cooling operation is blown out.

After that, the capacity suppression value S is set to zero after a predetermined time has elapsed from the time of switching so as to return to normal control, or
As the fluctuation of the intake air temperature becomes smaller, it becomes smaller and the normal control is resumed.

On the other hand, when the cooling operation is switched to the heating operation by the operation switching means (81), the step ST
2, the determination of ST4, ST8, ST10 and ST12 are each NO, the operation of step ST16 instead of the above step ST3, the operation of step ST17 instead of the above step ST6, the step instead of the above step ST9 The operation of ST18, the operation of step ST19 is performed instead of step ST11, and the operation of step ST20 is performed instead of step ST13.

Then, in the above-mentioned step ST16, it is determined whether or not the cooling thermo-on flag RTOF is set, and if the cooling operation is thermo-ON immediately before the switching to the heating operation, the cold air is blowing out, so the process proceeds to step ST5. , The capacity suppression value S is set, and the same operation as in the above-described cooling operation is performed. Further, Tc in steps ST17 and ST19 is the saturation temperature equivalent to the condensation pressure, and each control target value SCHmax, SCHmin, SC
Hs and the control value SCH are subcool values during the heating operation, and the control target value SCHs is set to a large value when switching to the heating operation, and in step ST15, the indoor electric expansion valve (51)
Set a smaller opening.

As a result, the amount of refrigerant flowing through the indoor heat exchanger (5) is suppressed, and hot air that is lower than the temperature of the hot air that is blown during the normal heating operation is blown out.

Therefore, as described above, since the indoor electric expansion valve (51) is throttled to suppress the operation ability when switching the air conditioning operation, the temperature difference between the cold air and the warm air when switching the operation can be reduced, so that the user can Since it does not suddenly receive cold air or hot air, it can significantly improve comfort. In particular, when the cooling operation and the heating operation are automatically switched, the air temperature gradually changes, and the comfort can be improved.

Further, since the opening degree of the indoor electric expansion valve (51) is made small, the refrigerant flow amount is suppressed, and the operating capacity can be accurately suppressed and controlled, so that the comfort at the time of switching the operation is surely achieved. Can be improved.

The present invention is not limited to the case of automatically switching the operating state, but may be used in the case of manually switching the air conditioning operation.

Further, the present invention is not limited to the multi-type air conditioner.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention. 2 to 4 show an embodiment of the present invention, FIG. 2 is a refrigerant circuit diagram of an air conditioner, FIG. 3 is a system configuration diagram of a dynamic control system, and FIG. 4 is an indoor electric expansion valve. It is a control flow figure. (6) …… Outdoor control unit (7) …… Branch control unit (8) …… Indoor control unit (11) …… Capacity restraining means (51) …… Indoor electric expansion valve (81) …… Operation switching means

Claims (1)

(57) [Claims] 1. An air-conditioning unit (B) which is provided with a heat exchanger and an electrically-operated expansion valve (51) whose opening degree is adjustable to control the amount of refrigerant flow, and which performs air-conditioning operations for cooling and heating, and the air-conditioning unit (B). In the operation control device of the air conditioner provided with the control unit (8) for controlling the air conditioning operation, the operation for outputting the switching signal for switching the air conditioning operation of the air conditioning unit (B) between the cooling operation and the heating operation. Switching means (81)
And a capacity suppressing means (11) for outputting a capacity suppressing signal for making the opening of the electric expansion valve (51) smaller than the control opening during normal operation when the operation switching means (81) outputs the switching signal. An operation control device for an air conditioner, which is provided.