JPH09236299A - Running control device for air conditioning apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a comfortable air conditioning control by ensuring a power- operated expansion valve to obtain a given opening degree. SOLUTION: A running volume of a compressor 21 is controlled in response to an air conditioning load while an opening rate of a power-operated expansion valve EV is controlled based on a detected temperature of a discharge pipe sensor Th-d such that a discharge-pipe temperature of the compressor 21 becomes an optimum discharge-pipe temperature. Furthermore, in the case where the running volume of the compressor 21 is large, a control speed for changing the opening rate of the electrically-operated expansion valve EV is accelerate, while in case that the operation volume of the compressor 21 is small, the control speed for changing the opening rate of the power-operated expansion valve EV is decelerated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner operation control device, and more particularly to a drive control measure for an electric expansion valve.

[0002]

2. Description of the Related Art Conventionally, air conditioners have been disclosed in
As disclosed in Japanese Patent Laid-Open No. 120120, there is one provided with a refrigerant circuit in which a compressor, an outdoor heat exchanger, an electric expansion valve, and an indoor heat exchanger are sequentially connected by a refrigerant pipe. Then, during the cooling operation, after the liquid refrigerant condensed in the outdoor heat exchanger is decompressed by the electric expansion valve, it is circulated to evaporate in the indoor heat exchanger and return to the compressor, while in the heating operation,
The liquid refrigerant condensed in the indoor heat exchanger is decompressed by the electric expansion valve, then evaporated in the outdoor heat exchanger and returned to the compressor for circulation.

[0003]

In the above-mentioned air conditioner, conventionally, the opening degree of the electric expansion valve is adjusted at regular intervals so that the discharge pipe temperature of the compressor becomes the target discharge pipe temperature. Depending on the operating frequency of the compressor, the electric expansion valve opening may converge slowly or may not converge.

That is, when the compressor is a high-pressure dome type, for example, when the operating frequency of the compressor motor is increased, the refrigerant temperature itself rises immediately, but the dome or the like requires a long time to rise in temperature. On the contrary, when the number of operating frequencies of the compressor motor is lowered, the temperature of the refrigerant itself is immediately lowered, but it takes time for the temperature of the dome or the like to be lowered.

The temperature change of the dome or the like becomes more difficult to follow the change of the refrigerant temperature as the operating capacity of the compressor is smaller.
Further, conventionally, as described above, the electric expansion valve is always controlled by the discharge pipe temperature at regular intervals, so that when the operating capacity of the compressor is small, the discharge pipe temperature is delayed with respect to the actual refrigerant temperature. Become.

As a result, the electric expansion valve may take a long time to converge to a predetermined opening degree, and the electric expansion valve may open too much or may be throttled too much, resulting in hunting. There is a problem that air conditioning control cannot be performed.

The present invention has been made in view of the above problems, and an object thereof is to ensure that the electric expansion valve converges to a predetermined opening degree and to perform comfortable air conditioning control. is there.

[0008]

[Means for Solving the Problems]

-Summary of the Invention-The present invention controls the operating capacity of the compressor (21) in accordance with the air conditioning load, and discharges the compressor (21) based on the temperature detected by the discharge pipe sensor (Th-d). While controlling the opening of the electric expansion valve (EV) so that the pipe temperature becomes the optimum discharge pipe temperature, if the operating capacity of the compressor (21) is large, the control speed for changing the opening of the electric expansion valve (EV) will be adjusted. If the operating capacity of the compressor (21) is small, the control speed for changing the opening degree of the electric expansion valve (EV) is controlled to be slow.

-Specific matters of the invention-Specifically, as shown in FIG. 1, the means taken by the invention according to claim 1 is as follows. First, a high pressure dome type compressor (21) having a variable operating capacity and a heat source. It is premised on an air conditioner including a refrigerant circuit (12) in which a side heat exchanger (23), an electric expansion valve (EV) with a variable opening degree, and a utilization side heat exchanger (31) are sequentially connected. .

An opening control means (52) for controlling the opening of the electric expansion valve (EV) is provided. in addition,
If the operating capacity of the compressor (21) is large, the electric expansion valve (E
The opening control means (52) is configured to increase the control speed for changing the opening degree of V) and decrease the control speed for changing the opening degree of the electric expansion valve (EV) when the operating capacity of the compressor (21) is small. Is provided with speed changing means (53) for outputting a change signal.

The means taken by the invention of claim 2 is, in the invention of claim 1 above, provided with temperature detecting means (Th-d) for detecting the temperature of the discharge pipe of the compressor (21). The opening control means (52) is a temperature detection means (Th-d)
In response to this temperature signal, the opening of the electric expansion valve (EV) is controlled so that the discharge pipe temperature of the compressor (21) reaches the target discharge pipe temperature.

The means taken by the invention according to claim 3 is the same as the invention according to claim 1, wherein temperature detecting means (Th-d) for detecting the discharge pipe temperature of the compressor (21) is provided. , Speed change means (53), temperature detection means (Th-d)
When the temperature of the discharge pipe becomes higher than a predetermined temperature in response to the temperature signal of, the change signal is output to the opening degree control means (52).

The means taken by the invention of claim 4 is the invention of claim 1 in which the speed changing means (53) is changed so that the opening control means (52) changes the control interval. It is configured to output a signal.

-Operation- Due to the above-mentioned matters specifying the invention, in the invention according to claim 1,
During air conditioning operation, the operating capacity of the compressor (21) is controlled according to the air conditioning load, while the opening control means (52)
In the invention according to claim 2, the opening degree of the electric expansion valve (EV) is received so that the discharge pipe temperature of the compressor (21) becomes the optimum discharge pipe temperature by receiving the temperature signal of the temperature detecting means (Th-d). Are in control.

In the opening control of the opening control means (52), the speed changing means (53) controls the opening speed of the electric expansion valve (EV) when the operating capacity of the compressor (21) is large. If the operating capacity of the compressor (21) is small, the electric expansion valve (E
Control so that the control speed for changing the V) opening is slowed.

Specifically, the speed changing means (53) is, for example, in the invention according to claim 3, a temperature detecting means (Th-d).
When the temperature of the discharge pipe is less than 50 ℃,
The opening control means (52) controls the opening of the electric expansion valve (EV) at a control interval of 5 minutes without outputting a change signal in order to quickly exit the wet operation of the refrigerant.

On the other hand, for example, in the normal operation in which the discharge pipe temperature is 50 ° C. or higher, the speed changing means (53) receives the operation capacity signal of the compressor (21) and, for example, the compressor (21).
In the frequency steps N1 and N2 where the operating capacity of
In the invention according to claim 4, the opening control means (52) outputs the low speed control signal and controls the opening of the electric expansion valve (EV) at a control interval of every 15 minutes.

The speed changing means (53) has a frequency step N in which the operating capacity of the compressor (21) is in the middle, for example.
In 3 to N5, the medium speed control signal is output, and the opening control means (52) outputs the electric expansion valve (E) at a control interval of 10 minutes.
V) control the opening.

Further, the speed changing means (53) is, for example, a frequency step N with a large operating capacity of the compressor (21).
In 6 to N8, a high speed control signal is output, and the opening degree control means (52) has an electric expansion valve (EV) at a control interval of 5 minutes.
A change signal is output to control the opening degree of.

As a result, when the operating capacity of the compressor (21) is small, the opening degree of the electric expansion valve (EV) fluctuates slowly, and conversely, when the operating capacity of the compressor (21) is large, the electric expansion valve. The opening of (EV) will change rapidly.

[0021]

Therefore, according to the first aspect of the invention, when the operating capacity of the compressor (21) is large, the electric expansion valve (E
The control speed for changing the opening of the electric expansion valve (EV) is increased by increasing the control speed for changing the opening of the electric expansion valve (EV) when the operating capacity of the compressor (21) is small. ) Can be quickly converged to a predetermined opening, and hunting of the opening can be reliably prevented. As a result, the refrigerant circulation amount can be accurately controlled, so that comfortable air conditioning control can be executed.

Particularly, according to the second aspect of the invention, when the opening degree of the electric expansion valve (EV) is controlled based on the discharge pipe temperature of the compressor (21), the delay of the discharge pipe temperature is absorbed. Therefore, the opening degree of the electric expansion valve (EV) can be accurately controlled.

According to the third aspect of the invention, the speed changing means (53) does not execute the control when the temperature of the discharge pipe of the compressor (21) is low. The compressor (21) can be removed without fail, and at the same time, when the discharge pipe temperature of the compressor (21) is in a normal state, hunting of the opening degree of the electric expansion valve (EV) is ensured. Therefore, the reliability of the opening control of the electric expansion valve (EV) can be improved.

According to the invention of claim 4, since the control interval of the electric expansion valve (EV) is changed to change the control speed, the electric expansion valve (EV) of the electric expansion valve (EV) can be controlled with simple control. The reliability of the opening control can be improved.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 2, the air conditioner (10) in this embodiment is a so-called separate type air in which one indoor unit (30) is connected to one outdoor unit (20). It is a harmony device.

The outdoor unit (20) includes a rotary type high-pressure dome compressor (21) whose operating frequency (operating capacity) is variably adjusted by an inverter, and a heating type during heating operation as indicated by the solid line in the figure during cooling operation. A four-way switching valve (22) that switches as indicated by the broken line in the figure, an outdoor heat exchanger (23) that is a heat source side heat exchanger that functions as a condenser during cooling operation and as an evaporator during heating operation, and decompresses the refrigerant. And an expansion fan (Fo) for the outdoor heat exchanger (23).

Further, the indoor unit (30) is provided with an indoor heat exchanger (31) which is a utilization side heat exchanger functioning as an evaporator during cooling operation and as a condenser during heating operation. An indoor fan (Fr) is provided at (31).

The compressor (21), the four-way switching valve (22), the outdoor heat exchanger (23), the expansion circuit (24) and the indoor heat exchanger (31) are connected by a refrigerant pipe (11). Refrigerant circuits that are connected in sequence and generate heat transfer by circulating the refrigerant (1
2) is configured.

The expansion circuit (24) includes a bridge-shaped direction control circuit (2a) and a one-way passage (2b) connected to the direction control circuit (2a), and the one-way passage (2b). Has
A liquid receiver (2c) located on the upstream side for storing the liquid refrigerant and an electric expansion valve (EV) located on the downstream side with adjustable opening are arranged in series.

The direction control circuit (2a) includes a check valve (CV,
CV, ...) each having a first inflow path (2d), a first outflow path (2e), a second inflow path (2f) and a second outflow path (2g) connected in a bridge shape. There is.

The first inflow passage (2d) is connected to the first connection point (P1) to which the outdoor heat exchanger (23) is connected to the second connection point to which the upstream end of the one-way passage (2b) is connected. A refrigerant flow is formed toward (P2), and the first outflow passage (2e) is connected from the third connection point (P3) to which the downstream end of the one-way passage (2b) is connected,
A refrigerant flow is formed toward the fourth connection point (P4) to which the indoor heat exchanger (31) is connected.

The second inflow path (2f) is connected to the fourth connection point (P
4) to form a refrigerant flow toward the second connection point (P2), and the second outflow passage (2g) forms a refrigerant flow from the third connection point (P3) toward the first connection point (P1). doing.

Further, a capillary tube (CP) is provided between the second connection point (P2) and the third connection point (P3) of the direction control circuit (2a) to which the one-way passage (2b) is connected. A liquid seal prevention passage (2h) is provided, and the liquid seal prevention passage (2h) is provided.
Prevents liquid sealing when the compressor (21) is stopped. In addition, the pressure reduction degree of the capillary tube (CP) is set to be sufficiently larger than that of the electric expansion valve (EV), and the refrigerant flow rate control function of the electric expansion valve (EV) during normal operation is well maintained. Is configured to be able to.

An on-off valve (SV) is provided between the upper part of the liquid receiver (2c) and the downstream side of the electric expansion valve (EV) in the one-way passage (2b) which is always the low pressure liquid line. A bypass passage (2i) that is provided and bypasses the electric expansion valve (EV) is connected to remove the gas refrigerant in the liquid receiver (2c).

Incidentally, (ER) is a silencer provided in the discharge pipe of the compressor (21) for reducing the operating noise of the compressor (21).

Further, the air conditioner (10) is provided with sensors. That is, in the discharge pipe of the compressor (21), there is a discharge pipe sensor (Th-d as a temperature detecting means for detecting the discharge pipe temperature Td which is the saturation temperature equivalent to the refrigerant pressure on the discharge side of the compressor (21). ) Is placed, outdoor unit (20)
The outside air temperature sensor (Th-a) that detects the outside air temperature Ta, which is the outside air temperature, is arranged at the air intake port of the outside heat exchanger (23), and the outside heat exchanger (23) has the condensation temperature during the cooling operation and the heating temperature during the heating operation. An external heat exchange sensor (Th-c) for detecting the external heat exchange temperature Tc which is the evaporation temperature is arranged.

A room temperature sensor (Th-r) for detecting an indoor temperature Tr, which is an indoor air temperature, is arranged at the air inlet of the indoor unit (30), and the indoor heat exchanger (31) is
Internal heat exchange sensor (Th-e) that detects the internal heat exchange temperature Te that becomes the evaporation temperature during the cooling operation and becomes the condensation temperature during the heating operation
Is arranged.

Further, the discharge pipe of the compressor (21) has a high-pressure pressure switch (PS) which detects a high-pressure refrigerant pressure and turns on when the high-pressure refrigerant pressure rises to output a high-pressure signal.
-1) is located.

The output signals of the sensors (Th-d to Th-e) and the high-pressure pressure switch (PS-1) are input to the controller (50), and the controller (50) outputs the input signals. It is configured to control the air conditioning operation based on the.

In the above-mentioned refrigerant circuit (12), during the cooling operation, the liquid refrigerant condensed and liquefied in the outdoor heat exchanger (23) is stored in the liquid receiver (2c) through the first inflow path (2d). After being decompressed by the electric expansion valve (EV), the first outflow path (2e)
Then, the heat is evaporated in the indoor heat exchanger (31) and returned to the compressor (21) for circulation, while the indoor heat exchanger (3
The liquid refrigerant condensed and liquefied in 1) passes through the second inflow path (2f) and is stored in the liquid receiver (2c), and the electric expansion valve (EV) decompresses it, and then the second outflow path (2g). Then, the heat is evaporated in the outdoor heat exchanger (23) and returned to the compressor (21) for circulation.

On the other hand, the controller (50) is provided with a capacity control means (51) for controlling the operating frequency which is the operating capacity of the compressor (21). The capacity control means (51)
Represents the output frequency of the inverter in eight frequency steps N
Each frequency step N is divided into
The operating frequency of the compressor (21) is controlled so that the room temperature Tr is set based on the temperature difference with the Tr so that the indoor temperature Tr becomes the set temperature. That is, the capacity control means (51) has each frequency step N in which the supply frequency and the applied voltage of the compressor motor (CM), which are the output frequency and the output voltage of the inverter, hold a predetermined relationship (V / F) in advance. Is set, the frequency step N is calculated based on the temperature difference between the set temperature and the room temperature Tr, and the inverter is controlled so that the voltage is applied to the compressor motor (CM) at the calculated frequency step N frequency. doing.

Further, the controller (50) is provided with an opening control means (52) for controlling the opening of the electric expansion valve (EV), and the opening control means (52) is a compressor. (twenty one)
The optimum discharge pipe temperature is derived and the opening degree of the electric expansion valve (EV) is controlled so that the discharge pipe temperature Td becomes the optimum discharge pipe temperature.

Specifically, the external heat exchange temperature Tc detected by the external heat exchange sensor (Th-c), the internal heat exchange temperature Te detected by the internal heat exchange sensor (Th-e), and the external air temperature sensor (Th -a) detects the outside air temperature Ta and the supply frequency of the compressor (21) set by the capacity control means (51), and the opening control means (52) controls the compressor (2).
1) Derivation of the optimum discharge pipe temperature and discharge pipe sensor (Th-d)
In response to this temperature signal, the opening degree of the electric expansion valve (EV) is controlled so that the discharge pipe temperature Td becomes the optimum discharge pipe temperature.

Further, the controller (50) is characterized by the speed changing means (5) of the electric expansion valve (EV) as a feature of the present invention.
3) is provided, and the speed changing means (53) is shown in Table 1 below.
As shown in, when the operating capacity of the compressor (21) is large, the control speed for changing the opening degree of the electric expansion valve (EV) is increased, and when the operating capacity of the compressor (21) is small, the electric expansion valve (EV) is increased. A change signal is output to the opening control means (52) so as to slow down the control speed for changing the opening.

[0046]

[Table 1]

Specifically, the speed changing means (53) receives the temperature signal of the discharge pipe sensor (Th-d) and outputs the discharge pipe temperature Td.
Is less than a predetermined temperature, for example, less than 50 ° C., without outputting a change signal in order to quickly exit the wet operation of the refrigerant,
The opening control means (52) controls the opening of the electric expansion valve (EV) at control intervals of 5 minutes.

On the other hand, when the discharge pipe temperature Td is 50 ° C. or higher, the speed changing means (53) receives the frequency step signal of the capacity control means (51) to change the operating capacity of the compressor (21). In the small frequency steps N1 and N2, the opening degree control means (52) outputs a change signal so as to control the opening degree of the electric expansion valve (EV) at control intervals of 15 minutes. Further, in the speed changing means (53), in the frequency steps N3 to N5 in which the operating capacity of the compressor (21) is in the middle, the opening degree control means (52) sets the electric expansion valve (at an interval of 10 minutes). Output a change signal to control the opening of EV). Further, in the speed changing means (53), in the frequency steps N6 to N8 in which the operating capacity of the compressor (21) is large, the opening control means (52) has an electric expansion valve (EV) at a control interval of 5 minutes. ) Outputs a change signal to control the opening degree.

That is, when the compressor (21) is a high-pressure dome type, the sucked low-pressure refrigerant is directly introduced into the rotary compression section and compressed, and the high-pressure refrigerant is discharged into the dome and discharged from the discharge pipe to the refrigerant pipe. It will be. Therefore, if the operating speed is increased by increasing the rotation speed of the compressor motor (CM), the refrigerant temperature itself immediately rises, but it takes time for the temperature of the dome or the like to rise. Conversely, if the operating speed is reduced by lowering the rotation speed of the compressor motor (CM), the refrigerant temperature itself immediately decreases, but it takes time for the temperature of the dome or the like to decrease.

The change in temperature of the dome or the like becomes more difficult to follow the change in refrigerant temperature as the operating capacity of the compressor (21) is smaller.

On the other hand, since the electric expansion valve (EV) is controlled by the discharge pipe temperature Td as described above, when the operating capacity of the compressor (21) is small, the discharge pipe temperature Td is lower than the actual refrigerant temperature. Will be delayed. Therefore, when the operating capacity of the compressor (21) is small, the control interval of the electric expansion valve (EV) is increased to slow down the control speed.

-Control Operation of Air Conditioner (10)-Next, the control operation of the air conditioner (10) will be described.

First, in both the cooling operation and the heating operation, the capacity control means (51) calculates the frequency step N of the inverter based on the temperature difference between the set temperature and the room temperature Tr. In this frequency step N, a predetermined relationship (V /
F) is set, the capacity control means (51) controls the voltage at the frequency of the calculated frequency step N to the compressor motor (C).
M) applied to the compressor (21) operating frequency (operating capacity)
Is controlling.

Further, the opening control means (52) includes an outer heat exchange temperature Tc detected by the outer heat exchange sensor (Th-c) and an inner heat exchange temperature Te detected by the inner heat exchange sensor (Th-e). And the outside temperature sensor (Th
-a) detects the outside air temperature Ta and the compressor (2) based on the supply frequency of the compressor (21) set by the capacity control means (51).
The optimum discharge pipe temperature of 1) is derived. The opening control means (52) receives the temperature signal from the discharge pipe sensor (Th-d) and adjusts the opening of the electric expansion valve (EV) so that the discharge pipe temperature Td becomes the optimum discharge pipe temperature. Have control.

In the opening control of the opening control means (52), as shown in Table 1, when the operating capacity of the compressor (21) is large, the speed changing means (53) operates the electric expansion valve (EV). The control speed for changing the opening is increased, and when the operating capacity of the compressor (21) is small, the control speed for changing the opening of the electric expansion valve (EV) is controlled to be slow.

Specifically, the speed changing means (53) receives the temperature signal of the discharge pipe sensor (Th-d), for example, and outputs no change signal when the discharge pipe temperature Td is less than 50 ° C. The opening degree control means (52) controls the opening degree of the electric expansion valve (EV) at a short control interval of every 5 minutes, and controls so as to quickly exit the wet operation.

On the other hand, for example, the discharge pipe temperature Td is 50 ° C.
In the above normal operation, the speed changing means (53) receives the frequency step signal of the capacity control means (51), and the frequency steps N1 and N2 in which the operating capacity of the compressor (21) is small.
Then, the low speed control signal is output and the opening control means (52)
However, the opening degree of the electric expansion valve (EV) is controlled at a control interval of every 15 minutes.

Further, the speed changing means (53) outputs a middle speed control signal in the frequency steps N3 to N5 in which the operating capacity of the compressor (21) is intermediate, and the opening control means (52)
The opening degree of the electric expansion valve (EV) is controlled at a control interval of every 10 minutes.

The speed changing means (53) outputs a high speed control signal in the frequency steps N6 to N8 in which the operating capacity of the compressor (21) is large, and the opening control means (52)
A change signal is output so as to control the opening degree of the electric expansion valve (EV) at control intervals of 5 minutes.

As a result, when the operating frequency of the compressor (21) is low, the opening degree of the electric expansion valve (EV) changes slowly, and conversely, when the operating frequency of the compressor (21) is high. The opening degree of the electric expansion valve (EV) fluctuates quickly.

-Effect of this Embodiment- As described above, according to this embodiment, when the operating capacity of the compressor (21) is large, the control speed for changing the opening degree of the electric expansion valve (EV) is increased, When the operating capacity of the compressor (21) is small, the control speed for changing the opening of the electric expansion valve (EV) is slowed down, so that the electric expansion valve (EV) can be quickly converged to a predetermined opening. In addition to this, hunting of the opening can be reliably prevented. As a result, the refrigerant circulation amount can be accurately controlled, so that comfortable air conditioning control can be executed.

Particularly, when the opening degree of the electric expansion valve (EV) is controlled based on the discharge pipe temperature Td of the compressor (21), the delay of the discharge pipe temperature Td can be absorbed, and the electric expansion valve (EV The opening degree of EV) can be controlled accurately.

Further, when the discharge pipe temperature Td of the compressor (21) is low, the speed changing means (53) does not execute the control, so that the wet operation of the refrigerant can be quickly exited, and the compressor (21 ) Can be surely protected,
When the discharge pipe temperature Td of the compressor (21) is in a normal state, hunting of the opening of the electric expansion valve (EV) can be reliably prevented, and the reliability of the opening control of the electric expansion valve (EV) is improved. Can be improved.

Further, since the control interval of the electric expansion valve (EV) is changed to change the control speed, the reliability of the opening control of the electric expansion valve (EV) can be improved by simple control. You can

[0065]

Other Embodiments In the present embodiment, the control interval of the electric expansion valve (EV) is changed to change the control speed. However, in the inventions according to claims 1 to 3, The drive speed itself of the electric expansion valve (EV) may be changed.

In addition to the rotary type compressor (21), the present invention may be a scroll type compressor or the like, and can be applied to a high pressure dome type compressor.

The present invention may of course be applied to a multi-type air conditioner as well as the separate type air conditioner (10).

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is a refrigerant circuit diagram showing an embodiment of the present invention.

[Explanation of symbols]

 10 Air conditioner 12 Refrigerant circuit 20 Outdoor unit 21 Compressor 22 Four-way switching valve 23 Outdoor heat exchanger (heat source side heat exchanger) EV electric expansion valve 30 Indoor unit 31 Indoor heat exchanger (use side heat exchanger) 50 Controller 51 Capacity control means (51) 52 Opening control means 53 Speed changing means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Iwao Shinohara 1304 Kanaoka-machi, Sakai City, Osaka Prefecture Daikin Industries, Ltd. Kanaoka Factory, Sakai Factory (72) Yuji Nishiyama 1304, Kanaoka-machi, Sakai City, Osaka Daikin Industries, Ltd. Sakai Plant Kanaoka Factory

Claims (4)

[Claims] 1. A high-pressure dome type compressor (21) having a variable operating capacity, a heat source side heat exchanger (23), an electric expansion valve (EV) having a variable opening degree, and a use side heat exchanger (31). In an air conditioner equipped with a refrigerant circuit (12) in which are sequentially connected, an opening control means (52) for controlling the opening of the electric expansion valve (EV) and an operating capacity of the compressor (21). Is large, the electric expansion valve (E
The opening control means (52) is configured to increase the control speed for changing the opening degree of V) and decrease the control speed for changing the opening degree of the electric expansion valve (EV) when the operating capacity of the compressor (21) is small. And a speed changing unit (53) for outputting a change signal to the air conditioner. 2. The operation control device for an air conditioner according to claim 1, wherein a temperature detecting means (Th) for detecting a discharge pipe temperature of the compressor (21).
-d) is provided, the opening control means (52) receives the temperature signal of the temperature detection means (Th-d) so that the discharge pipe temperature of the compressor (21) becomes the target discharge pipe temperature. An air conditioner operation control device characterized by controlling the opening of an electric expansion valve (EV). 3. The operation control device for an air conditioner according to claim 1, wherein the temperature detection means (Th is for detecting the discharge pipe temperature of the compressor (21).
-d) is provided, the speed changing means (53) receives a temperature signal from the temperature detecting means (Th-d), and when the discharge pipe temperature becomes higher than a predetermined temperature, the speed changing means (52) sends a change signal to the opening control means (52). An operation control device for an air conditioner, which is characterized in that: 4. The operation control device for an air conditioner according to claim 1, wherein the speed changing means (53) outputs a change signal so that the opening degree control means (52) changes the control interval. The air conditioner operation control device.