JPH04263734A - Controlling device for air conditioner - Google Patents

Abstract

PURPOSE:To always control an outdoor fan so as to maintain the optimum number of revolutions and sufficiently exhibit essential functions as an air conditioner at all regions of heating and cooling conditions. CONSTITUTION:Provisions are made of an inverter control unit 9 for calculating the number N of revolutions of an outdoor fan 3 to cause an outlet temperature Ti at a compressor 1 to approach a preset reference set value Ti0, and a DC motor control unit 13 for controlling the number N of revolutions of the outdoor fan 3 on the basis of the result thus calculated. The outlet temperature Ti and the reference set value Ti0 are compared with each other by the inverter control unit 9 to calculate the number N of revolutions of the outdoor fan 3, and on the basis of a result thus calculated, the number N of revolutions of the outdoor unit 3 is controlled by the DC motor control unit 13. As a result, the outlet temperature Ti at the compressor 1 is always regulated in the neighborhood of the reference set value Ti0, and the outlet pressure of the compressor is enhanced to a maximum level at all times.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an air conditioner, and more particularly to a fan rotation speed control device provided in an outdoor unit.

0002

2. Description of the Related Art Conventional control devices for air conditioners of this type include those shown in FIGS. 15 and 16. FIG. 15 is a configuration diagram showing a control device for this conventional air conditioner, and FIG. 16 is a block diagram showing the electrical configuration of the control device.

In the figure, 41 is a compressor that compresses refrigerant, 42 is an outdoor heat exchanger, 43 is an outdoor fan rotationally driven by a DC motor 44, 45 is a pressure reducer, 46 is an indoor heat exchanger, and 47 is an indoor heat exchanger. The refrigeration cycle switching mechanism includes a pressure switch 48 and a thermistor 49 for detecting the condensation temperature of the outdoor heat exchanger 42. Further, 50 is a comparison calculation means for comparing the detection signal of the thermistor 49 inputted via the A/D converter 51 with a reference set temperature, and 52 is a comparison calculation means for comparing the calculation result of the comparison calculation means 50 and the pressure switch 48. This is a rotation speed control means that controls the rotation speed of the DC motor 44 based on a signal.

Next, the operation of the air conditioner control device configured as described above will be explained. During heating operation and when the ambient temperature of the outdoor unit is low, the condensing temperature of the outdoor heat exchanger 42 becomes lower than the ambient temperature, frost may occur, and the heating capacity may decrease. When the condensation temperature of the outdoor heat exchanger 42 detected by the thermistor 49 becomes lower than the reference setting temperature, the comparison calculation means 50 determines that the amount of frost generated is large and causes the rotation speed control means 52 to The rotation speed of the outdoor fan 43 is increased to prevent a decrease in heating capacity.

[0005] Furthermore, during cooling operation and when the ambient temperature of the outdoor unit is high, the discharge pressure of the compressor 41 increases and there is a possibility that the equipment may be damaged. The pressure switch 48 operates when the discharge pressure of the compressor 41 exceeds a predetermined value,
Rotation speed control means 5 inputting the signal of the pressure switch 48
2 reduces the rotation speed of the outdoor fan 43. the result,
This prevents the cooling capacity from decreasing and the discharge pressure from increasing, thereby preventing equipment damage.

[0006] A control device for this type of air conditioner is disclosed in Japanese Unexamined Patent Publication No. 1-102253.

[0007]

[Problems to be Solved by the Invention] Conventional air conditioner control devices only prevent a decrease in performance when the ambient temperature is low based on the condensation temperature, as described above, and do not control all heating and cooling conditions. It is not designed to ensure competency in the area. Therefore, the performance of the air conditioner was not necessarily satisfactory.

Furthermore, although measures have been taken to prevent equipment damage due to increased discharge pressure as described above, no measures have been taken to protect the inverter device for driving the compressor from surrounding heat, and it is difficult to prevent damage due to heat. There was a possibility that the life of the inverter device would be shortened or it would be destroyed. Therefore, the first invention provides an air conditioner control device that can always control an outdoor fan to the optimum rotation speed and fully utilize the inherent ability of the air conditioner in all areas of heating and cooling conditions. The challenge is to

[0009] A second object of the invention is to provide an air conditioner control device that can always control an outdoor fan to an optimal rotation speed and prevent shortening of the life span or destruction of electrical equipment due to heat. It is something.

0010

[Means for Solving the Problems] A control device for an air conditioner according to a first aspect of the present invention provides a rotation speed for calculating the rotation speed of an outdoor fan in order to bring the discharge temperature of a compressor close to a preset reference setting value. This device includes a calculation means and a rotation speed control means for controlling the rotation speed of the outdoor fan based on the calculation result.

[0011] A control device for an air conditioner according to a second aspect of the present invention includes a rotation speed calculation means for calculating the rotation speed of an outdoor fan in order to suppress the ambient temperature of an electric device to a preset reference setting value or less; A rotation speed control means for controlling the rotation speed of the outdoor fan based on the calculation result is provided.

0012

[Operation] In the first invention, the discharge temperature detected by the discharge temperature detection means and the reference set value are compared by the rotation speed calculation means, the rotation speed of the outdoor fan is calculated, and the rotation speed of the outdoor fan is calculated based on the calculation result. The rotation speed of the outdoor fan is controlled by the rotation speed control means, and as a result, the discharge temperature of the compressor is always adjusted to around the reference setting value, and the discharge pressure of the compressor is always maximized.

In the second invention, the ambient temperature detected by the ambient temperature detection means and the reference set value are compared by the rotation speed calculation means to calculate the rotation speed of the outdoor fan, and the rotation speed of the outdoor fan is calculated based on the calculation result. The rotation speed of the outdoor fan is controlled by the rotation speed control means, and as a result, the actual ambient temperature of the electrical equipment is suppressed to below the reference set value.

[0014]

[Examples] Examples of the present invention will be described below. [First Embodiment] FIG. 1 is a block diagram showing a control device for an air conditioner according to a first embodiment embodying the first invention.

In the figure, 1 is a compressor that is driven by an electric motor (not shown) to compress refrigerant, 2 is an outdoor heat exchanger, and 3 is a compressor that compresses refrigerant.
5 is a pressure reducer, 6 is an indoor heat exchanger, and 7 is a refrigeration cycle switching mechanism. Further, 8 is the compressor 1
9 is an inverter control unit consisting of a microcomputer that inputs the detection signal of the thermistor 8, 10 is an AC power supply, 11 is a converter unit that converts the AC power supply 10 into DC, and 12 is a smoothing capacitor. be.

Further, 13 is a DC motor control unit which is supplied with DC power from the smoothing capacitor 12 and outputs a drive signal to the DC motor 4, and 14 is the inverter control unit 9.
This is an inverter section that converts the direct current from the converter section 11 into alternating current of an arbitrary frequency based on the PWM signal output from the converter section 11. Further, 15 is an inverter device composed of the converter section 11, the smoothing capacitor 12, and the inverter section 14, and 16 is an outdoor unit that accommodates all equipment other than the indoor heat exchanger 6 and the AC power source 10.

Next, the operation of the air conditioner control device of this embodiment configured as described above will be explained. FIG. 2 is a flowchart showing the processing executed by the control device. first,
In step 101, the discharge temperature Ti of the compressor 1 from the thermistor 8 is input, and in step 102, a counter i is incremented. Then, in step 103, the processes of step 101 and step 102 are repeated until the counter i reaches 104, that is, four times, and in step 104, the discharge temperatures Ti for the four times are averaged. Note that this processing is for reducing reading errors.

Next, when it is determined in step 105 that the air conditioner is in cooling operation, the discharge temperature Ti is set to a preset reference setting value Ti0 in step 106.
It is determined whether or not the value is greater than or equal to the value. This reference setting value Ti0 is set to the discharge temperature when the discharge pressure of the compressor 1 is maximized without causing breakdown. When the discharge temperature Ti is equal to or higher than the reference set value Ti0 in step 106, the current rotation speed N of the DC motor 4 is set as the target rotation speed in step 107, and when the discharge temperature Ti is less than the reference set value Ti0, step At 108, a value obtained by subtracting a preset value α from the current rotation speed N is set as the target rotation speed.

Further, when heating operation is in progress in step 5, it is determined in step 109 whether or not the discharge temperature Ti is greater than or equal to the reference setting value Ti0, and when it is greater than or equal to the reference setting value Ti0, in step 110 The current rotation speed N of the DC motor 4 is set as the target rotation speed, and when the discharge temperature Ti is less than the reference set value Ti0, the value obtained by adding the set value α to the current rotation speed N is set as the target rotation speed in step 111. Set as . Then, in step 112, the DC motor control section 13 controls the rotation speed of the DC motor 4, aiming at the target rotation speed N set in any one of steps 107, 108, 110, and 111.

Next, in step 113, the timer t is counted up, and in step 114, the timer t reaches the set time t.
If it has reached 0, the process moves to step 115. This set time t0 is estimated to be the time until the result of changing the rotational speed of the DC motor 4 in step 112 is reflected in the refrigeration cycle.

Furthermore, when the set time t0 has elapsed, the discharge temperature Ti of the compressor 1 is detected and averaged in step 115, similar to the processing in steps 101 to 104, and the current discharge temperature Ti is detected in step 116. The previous discharge temperature Ti is subtracted from the temperature Ti. Then, in step 117, a correction value M is determined from the difference in the discharge temperature Ti and the operation mode from the coefficient table below, and the current rotational speed N of the DC motor 4 is corrected based on the correction value M. Return to 1.

[0022]

Therefore, first, in step 106 or step 109, the DC motor 4 is experimentally adjusted depending on the comparison result between the discharge temperature Ti of the compressor 1 and the reference set value Ti0.
The rotational speed N of is corrected, and then the measured discharge temperature T
Based on the difference between i and the previous discharge temperature Ti, that is, the amount of change, a correction value M for controlling the discharge temperature Ti of the compressor 1 to the reference setting value Ti0 is calculated in step 117,
According to the correction value M, the actual rotation speed N of the DC motor 4 is controlled.

As described above, the air conditioner control device of this embodiment includes an outdoor fan 3 provided in the outdoor heat exchanger 2 and driven by a DC motor 4 at an arbitrary rotation speed, and a refrigerant compressor. a thermistor 8 that detects the discharge temperature Ti of the compressor 1; a discharge temperature Ti detected by the thermistor 8;
The actual discharge temperature Ti is compared with a reference setting value Ti0 set in advance as the discharge temperature at the maximum discharge pressure of the compressor 1.
an inverter control unit 9 that calculates the rotation speed N of the outdoor fan 3 in order to make it approach the reference setting value Ti0; and an inverter control unit 9 that calculates the rotation speed N of the outdoor fan 3 by the DC motor 4 based on the calculation result of the inverter control unit 9. It is equipped with a DC motor control section 13 for controlling the motor.

Therefore, the discharge temperature Ti detected by the thermistor 8 and the reference set value Ti0 are compared in the inverter control unit 9 to calculate the rotation speed N of the outdoor fan 3, and based on the calculation result, the DC motor The control unit 13 controls the rotation speed N of the outdoor fan 3. As a result, regardless of the cooling and heating operation modes, the discharge temperature T of the compressor 1
i is always adjusted to around the standard set value Ti0, and the discharge pressure of the compressor 1 is always maximized. Therefore, the inherent ability of the air conditioner can be fully demonstrated in all areas of heating and cooling conditions.

[Second Embodiment] FIG. 3 is a flowchart showing the processing executed by the air conditioner control device of the second embodiment embodying the first invention, and FIG. 4 shows the calculation result of the rotation speed of the DC motor. FIG. 3 is a characteristic diagram showing the relationship between the rotation speed and the actual rotation speed. Note that the configuration of the control device of this air conditioner is the same as the control device described in the first embodiment, and in particular, in this embodiment, differences in operation will be explained with emphasis.

The processing of the control device of this embodiment differs from the processing of the first embodiment in that step 118 is added. Through the processing in step 118, the upper and lower limits of the rotation speed N of the DC motor 4 (the upper and lower limits of the appropriate rotation speed of the DC motor 4) are set.
Even if the rotational speed N exceeding the range is calculated in step 17, it is regulated to the upper and lower limit values. Therefore, the rotational speed N of the DC motor 4 is controlled within a certain range to prevent problems such as overspeeding, and even in this case, as in the first embodiment, regardless of the cooling and heating operation modes,
By controlling the outdoor fan 3, the discharge pressure of the compressor 1 is always maximized, and the original ability of the air conditioner is utilized for heating and heating.
It can be fully utilized in all areas of cooling conditions.

[Third Embodiment] FIG. 5 is a block diagram showing a control device for an air conditioner according to a third embodiment embodying the second invention. In the figure, reference numeral 21 denotes a thermistor for detecting the ambient temperature of various parts of the inverter device 15, and instead of this thermistor 21, the discharge temperature detecting thermistor 8 of the first and second embodiments is omitted.

FIG. 6 is a flowchart showing the processing executed by the control device, and FIG. 7 is a characteristic diagram showing the relationship between the ambient temperature of the inverter device and the rotational speed of the DC motor.

First, step 201 to step 204
In step 205, the ambient temperature Tj of the inverter device 15 from the thermistor 21 is input four times and averaged, and in step 205, the ambient temperature Tj is set to a preset reference setting value Tj0.
It is determined whether or not the value is greater than or equal to the value. As this reference setting value Tj0, a protection temperature is set in consideration of the safety of various parts of the inverter device 15. When the ambient temperature Tj is less than the reference set value Tj0 in step 205, the current rotation speed N of the DC motor 4 is set as the target rotation speed in step 206, and the ambient temperature Tj is set to the reference set value Tj.
When it is 0 or more, the maximum rotation speed Nmax of the DC motor 4 is set as the target rotation speed in step 207.

[0031] Then, in step 208, the step 2
The DC motor control unit 13 controls the rotation speed N of the DC motor 4 with the target rotation speed N set in either of 06 and 207 as a target, and the process returns to step 1.

Therefore, as shown in the figure, the rotational speed N of the DC motor 4 is switched according to the ambient temperature Tj of the inverter device 15 with reference setting value Tj0 as the boundary.
As a result, the ambient temperature Tj of the inverter device 15 is always suppressed to below the reference set value Tj0 by the outdoor fan 3.

As described above, the air conditioner control device of this embodiment includes the outdoor fan 3 provided in the outdoor heat exchanger 2 and driven by the DC motor 4 at an arbitrary rotation speed, and the outdoor unit 16.
a thermistor 21 that detects the ambient temperature Tj of the inverter device 15 installed in the inverter device 15; the ambient temperature Tj detected by the thermistor 21; and a standard setting preset as a protective temperature considering the safety of the inverter device 15. an inverter control unit 9 that calculates the rotation speed N of the outdoor fan 3 in order to suppress the actual ambient temperature Tj to below the reference set value Tj0, and based on the calculation result of the inverter control unit 9. a DC motor control unit 13 that controls the rotation speed of the outdoor fan 3 by the DC motor 4;
It is equipped with.

Therefore, the ambient temperature Tj detected by the thermistor 21 and the reference set value Tj0 are compared in the inverter control unit 9 to calculate the rotation speed N of the outdoor fan 3, and based on the calculation result, the DC motor The control unit 13 controls the rotation speed N of the outdoor fan 3, and as a result, the actual ambient temperature Tj of the inverter device 15 is equal to the reference setting value Tj.
It is suppressed to 0 or less. Therefore, the inverter device 1 due to heat
It is possible to prevent a decrease in the lifespan or destruction of the product.

[Fourth Embodiment] FIG. 8 is a flowchart showing the processing executed by the air conditioner control device of the fourth embodiment embodying the second invention, and FIG. 9 shows the ambient temperature of the inverter device and the DC motor. FIG. Note that the configuration of the control device of this air conditioner is the same as the control device described in the third embodiment, and in particular, in this embodiment, differences in operation will be explained with emphasis.

The processing of the control device of this embodiment differs from the processing of the third embodiment in that the content of step 207 is changed and step 209 is added. That is, in step 205, the ambient temperature Tj of the inverter device 15 is set to the reference setting value Tj.
When it is 0 or more, in step 207, the surrounding temperature Tj
The rotational speed N of the DC motor 4 is corrected based on the difference between the reference setting value Tj0 and the reference setting value Tj0 (the larger the difference, the larger the correction amount), and in step 209, the upper and lower limits of the corrected rotational speed N are set. . Therefore, even if the rotation speed N is corrected in step 207 to exceed the upper limit or lower limit, it is regulated to the upper or lower limit value in step 209, and the rotation speed N of the DC motor 4 is controlled within a certain range. Ru.

In this case, as in the third embodiment, the ambient temperature T of the inverter device 15 is controlled by the outdoor fan 3.
It is possible to always suppress j to a reference setting value Tj0 or less, and to prevent the inverter device 15 from being shortened in life or destroyed due to heat.

[Fifth Embodiment] FIG. 10 is a block diagram showing a control device for an air conditioner according to a fifth embodiment embodying the second invention.

In the figure, numeral 31 is a thermistor for detecting the ambient temperature Tk of the outdoor unit 16;
Inverter device 15 of the third and fourth embodiments instead of 1
The ambient temperature detection thermistor 21 is omitted. FIG. 11 is a flowchart showing the processing executed by the control device;
FIG. 12 is a characteristic diagram showing the relationship between the ambient temperature of the outdoor unit and the rotation speed of the DC motor.

First, step 301 to step 304
The ambient temperature Tk of the outdoor unit 16 from the thermistor 31 is
is input four times and averaged, and in step 305 it is determined whether the surrounding temperature Tk is equal to or higher than a preset reference setting value Tk0. As this reference setting value Tk0, a protection temperature is set in consideration of the safety of various parts of the inverter device 15. If the ambient temperature Tk is less than the reference set value Tk0 in step 305, step 3
In step 06, the current rotation speed N of the DC motor 4 is set as the target rotation speed, and when the ambient temperature Tk is equal to or higher than the reference set value Tk0, the maximum rotation speed Nmax of the DC motor 4 is set as the target rotation speed in step 307. .

[0041] Then, in step 308, the step 3
The DC motor control section 13 controls the rotation speed N of the DC motor 4 with the target rotation speed N set in either of 06 and 307 as a target, and the process returns to step 1.

Therefore, as shown in FIG. 12, the rotational speed N of the DC motor 4 is switched according to the ambient temperature Tk of the inverter device 15 with reference set value Tk0 as a boundary, and as a result, the outdoor fan 3 causes the inverter device 15 to The ambient temperature Tk is always suppressed to below the reference setting value Tk0. Therefore, it is possible to prevent the inverter device 15 from being shortened in life or destroyed due to heat.

[Sixth Embodiment] FIG. 13 is a flowchart showing the processing executed by the air conditioner control device of the sixth embodiment embodying the second invention, and FIG. 14 shows the ambient temperature of the outdoor unit and the DC motor. FIG. Note that the configuration of the control device of this air conditioner is the same as that of the control device described in the fifth embodiment, and in particular, in this embodiment, the differences in operation will be mainly explained.

The processing of the control device of this embodiment differs from the processing of the fifth embodiment in that the content of step 307 is changed and step 309 is added. That is, in step 305, the ambient temperature Tk of the inverter device 15 is set to the reference setting value Tk.
If it is 0 or more, in step 307 the surrounding temperature Tk
The rotational speed N of the DC motor 4 is corrected based on the difference between the reference setting value Tk0 and the reference setting value Tk0 (the larger the difference, the larger the correction amount), and in step 309, the upper and lower limits of the corrected rotational speed N are set. . Therefore, even if the rotation speed N is corrected in step 307 to exceed the upper or lower limit, it is regulated to the upper or lower limit value in step 309, and the rotation speed N of the DC motor 4 is controlled within a certain range. Ru.

In this case, as in the fifth embodiment, the ambient temperature T of the inverter device 15 is controlled by the outdoor fan 3.
By always suppressing k to below the reference setting value Tk0, it is possible to prevent the inverter device 15 from being shortened in life or destroyed due to heat.

By the way, although the variable drive means in the above embodiment is configured as a DC motor, when carrying out the present invention, the present invention is not limited to this, and the rotation speed control means can be used to control the rotation speed at any desired speed. Any material that can be controlled is fine. However, if a DC motor is used, it is possible to perform highly accurate control with an inexpensive configuration.

Further, although the discharge temperature detection means in the above embodiment is configured as a thermistor, the discharge temperature of the compressor,
Alternatively, any device that can detect the ambient temperature of the inverter device or outdoor unit may be used. Further, although the discharge temperature detection means in the above embodiment is configured as a thermistor, it may be any other device as long as it can detect the discharge temperature of the compressor or the ambient temperature of the inverter device or outdoor unit.

[0048]

Effects of the Invention As described above, the air conditioner control device of the first invention has an outdoor fan that is driven at an arbitrary rotation speed by the variable drive means, and a compressor that is detected by the discharge temperature detection means. rotation speed calculation means for calculating the rotation speed of the outdoor fan in order to bring the discharge temperature of the machine closer to a preset reference setting value; and controlling the rotation speed of the outdoor fan based on the calculation result of the rotation speed calculation means. The rotation speed of the outdoor fan is controlled by the rotation speed control means based on the calculation result of the rotation speed calculation means, and as a result,
The discharge temperature of the compressor is always adjusted to around the standard set value, the discharge pressure of the compressor is always maximized, and the original ability of the air conditioner is fully demonstrated in all areas of heating and cooling conditions. Can be done.

[0049] Furthermore, the air conditioner control device of the second invention controls the ambient temperature of the outdoor fan driven at an arbitrary rotation speed by the variable drive means and the electric equipment detected by the ambient temperature detection means. a rotation speed calculation means for calculating the rotation speed of the outdoor fan so as to suppress it to a preset reference setting value or less; and a rotation speed calculation means for controlling the rotation speed of the outdoor fan by the variable drive means based on the calculation result of the rotation speed calculation means. The rotation speed control means controls the rotation speed of the outdoor fan based on the calculation result of the rotation speed calculation means, and as a result, the actual ambient temperature of the electrical equipment is adjusted to the reference setting value. It is possible to prevent the life of electrical equipment from being shortened or destroyed due to heat.

[0050]

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a first embodiment of an air conditioner control device embodying the first invention.

FIG. 2 is a flowchart showing processing executed by the air conditioner control device of the first embodiment embodying the first invention.

FIG. 3 is a flowchart showing processing executed by a control device for an air conditioner according to a second embodiment of the first invention.

FIG. 4 is a characteristic diagram showing the relationship between the calculation result of the rotation speed of a DC motor and the actual rotation speed in the air conditioner control device of the second embodiment embodying the first invention.

FIG. 5 is a configuration diagram showing a third embodiment of an air conditioner control device embodying the second invention.

FIG. 6 is a flowchart showing processing executed by a control device for an air conditioner according to a third embodiment of the second invention.

FIG. 7 is a characteristic diagram showing the relationship between the ambient temperature of the inverter device and the rotation speed of the DC motor in the air conditioner control device of the third embodiment embodying the second invention.

FIG. 8 is a flowchart showing a process executed by a control device for an air conditioner according to a fourth embodiment of the second invention.

FIG. 9 is a characteristic diagram showing the relationship between the ambient temperature of the inverter device and the rotation speed of the DC motor in the air conditioner control device of the fourth embodiment embodying the second invention.

FIG. 10 is a configuration diagram showing a fifth embodiment of an air conditioner control device embodying the second invention.

FIG. 11 is a flowchart showing processing executed by a control device for an air conditioner according to a fifth embodiment embodying the second invention.

FIG. 12 is a characteristic diagram showing the relationship between the ambient temperature of the outdoor unit and the rotation speed of the DC motor in the air conditioner control device of the fifth embodiment embodying the second invention.

FIG. 13 is a flowchart showing processing executed by a control device for an air conditioner according to a sixth embodiment of the second invention.

FIG. 14 is a characteristic diagram showing the relationship between the ambient temperature of the outdoor unit and the rotational speed of the DC motor in the air conditioner control device of the sixth embodiment embodying the second invention.

FIG. 15 is a configuration diagram showing a conventional air conditioner control device.

FIG. 16 is a block diagram showing the electrical configuration of a conventional air conditioner control device.

[Explanation of symbols]

1 Compressor 2 Outdoor heat exchanger 3
outdoor fan 4
DC motor (variable drive means) 8
Thermistor (discharge temperature detection means) 9
Inverter control unit (rotation speed calculation means) 13
DC motor control section (rotation speed control means)
15 Inverter device (electrical equipment)
16 Outdoor unit 21, 31 Thermistor (surrounding temperature detection means) N Rotation speed Ti Discharge temperature Tj, Tk Ambient temperature

Claims (2)

[Claims] 1. An outdoor fan provided in an outdoor heat exchanger and driven at an arbitrary rotation speed by a variable drive means; a discharge temperature detection means for detecting a discharge temperature of a compressor for compressing refrigerant; The discharge temperature detected by the temperature detection means is compared with a reference set value preset as the discharge temperature at the maximum discharge pressure of the compressor, and the outdoor fan is operated in order to bring the actual discharge temperature closer to the reference set value. and a rotation speed control means for controlling the rotation speed of the outdoor fan by the variable drive means based on the calculation result of the rotation speed calculation means. Control device for harmonizer. 2. An outdoor fan provided in the outdoor heat exchanger and driven at an arbitrary rotation speed by a variable drive means; an ambient temperature detection means for detecting the ambient temperature of an electric device installed in the outdoor unit; The ambient temperature detected by the ambient temperature detection means is compared with a reference set value preset as a protective temperature in consideration of the safety of the electrical equipment, and the actual ambient temperature is suppressed to below the reference set value. and a rotation speed control means for controlling the rotation speed of the outdoor fan by the variable drive means based on the calculation result of the rotation speed calculation means. Control device for air conditioners.