JPH11169634A - Air conditioning equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong the exchanging life of a HEPA filter by providing a detecting means of pressure loss increase by the clogging of the HEPA filter due to the collected dust and controlling so as to increase the torque of a motor to supply the decreased portion of air quantity to prevent the decrease of the air quantity to keep air conditioning capacity. SOLUTION: An air heat-exchanged in a heat exchanger 2 is blown into a chamber A2 by a fan 4. In such a case, the HEPA filter 6 is installed in the chamber A2 to collect floating dust 10 to produce an highly cleaned air. The air quantity is decreased when the HEPA filter collects a large quantity of dust and the pressure loss of the air passage in the front and the rear side of the HEPA filter is increased. Then, the supplement of the air quantity is decided from the increased portion of the pressure loss by detecting the pressure in the front and the rear side of the HEPA filter by pressure sensors 7, 8 and calculating the increased portion of the pressure loss from the initial state by an indoor machine control device 9. And the motor torque is varied to obtain total air quantity with the supplement of the air quantity to keep the initial air quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-efficiency particulate air filter (hereinafter referred to as H) incorporated in a ceiling cassette type air conditioner.
(Hereinafter referred to as EPA).

[0002]

2. Description of the Related Art Conventionally, even if a medium-performance / high-performance filter is clogged, the operation is continued with a reduced air flow until a certain period of time, at which it is assumed that the air flow continues to be reduced to a minimum operable air flow, has elapsed. Was.

[0003]

SUMMARY OF THE INVENTION
HEPA filters, which have higher dust collection efficiency than high-performance filters, are easily clogged and have been used mainly in markets such as clean rooms and hospitals that require long-term no maintenance. For this reason, there has been a problem in that the cooling / heating capacity is reduced due to a decrease in the air volume, and the HEPA filter replacement life is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. The present invention has been made to prevent a decrease in air volume, thereby maintaining a cooling / heating capacity, and extending a replacement life of a HEPA filter. An object of the present invention is to obtain an air conditioner capable of improving maintainability.

[0005]

The present invention employs the following means to achieve the above object. That is, the air conditioner according to the first aspect of the present invention provides a blower assembly including an air suction port, a fan, a fan casing, and a motor installed on the back surface, and cools suction air between the suction port and the blower assembly. Alternatively, a suction side chamber in which a heat exchanger to be heated is installed, a HEPA filter for capturing dust contained in air blown out from a fan casing outlet, and an outlet side chamber having an outlet in contact with a ceiling surface. In the constructed ceiling cassette type air conditioner,
There is a pressure loss detecting means that increases due to clogging of the HEPA filter with captured dust, and a control means that increases the motor torque in order to increase the amount of air flow reduction.

[0006] The air conditioner according to the second invention comprises a first air conditioner.
A pressure sensor is provided before and after the HEPA filter as pressure loss detecting means.

[0007] An air conditioner according to a third invention is a first air conditioner.
The present invention comprises the constituent elements according to the invention, and as a pressure loss detecting means, predicts the amount of dust trapped by the HEPA filter according to the initial suspended dust concentration in the installation environment of the ceiling cassette type air conditioner, and counts the time of the fan. Set a timer,
It has a control means for calculating the pressure loss of the HEPA filter in time series from the timer and the amount of dust captured.

[0008] An air conditioner according to a fourth aspect of the present invention is a first air conditioner.
And a voltage change control means by phase control as a control for increasing the torque of the motor.

An air conditioner according to a fifth aspect of the present invention is the air conditioner according to the first aspect.
And a power supply frequency change control means by inverter control as a motor torque increase control.

An air conditioner according to a sixth aspect of the present invention is the air conditioner according to the first aspect.
And a means for controlling a change in the winding resistance of the motor by a relay switch as control for increasing the torque of the motor.

An air conditioner according to a seventh aspect of the present invention is the air conditioner according to the first aspect.
And control means for setting a torque limit value of the motor and transmitting a filter replacement sign to the management system when the torque reaches the limit value.

An air conditioner according to an eighth aspect of the present invention is the air conditioner according to the first aspect.
And a control means for counting the timer from the start of transmitting the filter replacement sign and stopping the ceiling cassette type air conditioner when the timer has elapsed for a set time or more.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 1 and 3 are views showing an example of an embodiment of the present invention. FIG. 1 is a sectional view of the configuration, and FIG. 3 is a flowchart.

In FIG. 1, 1 is an outer frame, 2 is a heat exchanger,
Reference numeral 3 denotes a fan casing, 4 denotes a fan, 5 denotes a motor, and 6 denotes a HEPA filter. In the chamber A1, the heat exchanger 2 is provided on the suction port side with respect to the fan casing 3,
The fan casing 3 sucks in air that has been heat-exchanged by the refrigerant flowing inside the heat exchanger.

The sucked air is blown from the outlet of the fan casing 3 to the chamber A2 from the chamber A1, and the HEPA filter 6 is installed in the chamber A2 to capture the floating dust 10 and to purify the air with high cleanliness. Has been installed. The outlet of the chamber A2 has a larger outlet area and a lower outlet wind speed in order to eliminate a draft feeling caused by the wind directly hitting the body.

The lower surface of the chamber A2 is in contact with the ceiling surface and blows out perpendicular to the floor surface. A
Is a cassette type indoor unit in which an air passage is formed as described above.
7 is a pressure sensor for detecting the pressure at the air path inlet of the HEPA filter 6, 8 is a pressure sensor for detecting the pressure at the air path outlet of the HEPA filter 6, 9 is installed in the indoor unit A, and controls the actuator in the indoor unit A. , An indoor unit control device for calculating and storing. A transmission line 11 is used for communication between the indoor unit control device 9 and electric components.

If the accumulated time during which the fan 4 rotates increases, the amount of dust collected by the HEPA filter 6 increases,
Air resistance due to clogging increases. Therefore, FIG.
When the air passage pressure loss before and after the HEPA filter 6 increases, the air volume decreases.

In FIG. 3, in Step 1, an initial pressure loss P0 and an initial air volume Fu0 of the HEPA filter 6 are set in the indoor unit control device 9 in advance, and the motor 5 is driven in Step 2 to rotate the fan 4.

In Step 3, the floating dust 10 is captured by the HEPA filter 6 by the air circulation in Step 2,
Since the pressure loss before and after the HEPA filter 6 increases according to the accumulated time during which the fan 4 is rotating, the pressure sensors 7 and 8 detect the pressure before and after the HEPA filter 6, and the indoor unit control device 9 detects the pressure loss from the initial state. Increase ΔPt (= Pt−P
0), and the relational expression (ΔFu = 2 × ΔP) of the air flow increase ΔFt with respect to the pressure loss increase ΔPt in FIG.
t: the relational expression or the coefficient changes depending on the indoor unit structure) in the indoor unit control device 9 in advance, and the airflow increase ΔFu is determined by the pressure loss increase ΔPt.

In Step 5, the relationship between the pressure loss and the motor torque shown in FIG. 5 is set in advance in the indoor unit control device 9 to vary the motor torque by setting the total air volume Fut (= FU0 + ΔFut) in consideration of the air volume increase ΔFu. To maintain the initial air volume.

As described above, even if the pressure loss increases due to clogging due to long-term use of the HEPA filter 6, it is possible to prevent a decrease in air volume and maintain the performance. Also,
The HEPA filter 6 is often used in places with high cleanliness, such as a clean room and a hospital. Therefore, by maintaining the air volume, the final pressure loss of the HEPA filter 6 (the pressure loss of the HEPA filter at the required minimum air volume) can be increased, the accumulated operation time can be extended, and the maintenance frequency can be improved by reducing the number of replacements. it can.

Embodiment 2 FIG. Next, FIG. 6 is a diagram showing an example of the embodiment of the invention, and is a control flowchart.

FIG. 6 is a control flow of the air conditioner having the configuration and operation of FIG. 1 described in the first embodiment.
A control flow showing the front-back pressure loss detecting means of the EPA filter 6 will be described with reference to a flowchart in FIG.

In FIG. 6, HEPA is performed in Steps 6 and 7.
The pressure at the air path inlet of the filter 6 is detected by the pressure sensor 7 as HEP.
The pressure at the air passage outlet of the A filter 6 is detected by the pressure sensor 8 as pressures P1 and P2, and the detected pressure values P1 and P2 are converted into electric signals.

In Step 8, the indoor unit controller 9 receives the pressure sensor 7 and the pressure electric signal of the pressure sensor 8 via the transmission line 11, and converts the pressure electric signal into a pressure value. Then, the pressure loss ΔP before and after the HEPA filter 6 (= P1−P
2) is calculated. By repeating this control operation, the pressure loss before and after the HEPA filter 6 can always be detected.

As described above, by providing the pressure sensors 7 and 8 before and after the HEPA filter 6, the pressure loss can be accurately detected, and the decrease in the air volume due to the pressure loss can be accurately grasped.

Embodiment 3 Next, FIG. 7 is a diagram showing an example of the embodiment of the invention, and is a control flowchart.

FIG. 7 is a control flow of the air conditioner having the configuration and operation of FIG. 1 described in the first embodiment.
A control flow showing the front and rear pressure loss detecting means of the EPA filter 6 will be described with reference to a flowchart in FIG.

In FIG. 7, when the fan 4 is rotating in Step 9, the accumulated time ta in the indoor unit controller 9 is counted in Step 10. When the fan 4 is stopped, the accumulated time ta is not counted in Step 11, and the accumulated time is kept suspended.

In Step 12, the pressure loss ΔP of the HEPA filter 6 according to the dust concentration of the installation environment of the indoor unit A is determined from the relationship between the fan 4 hours ta due to the change in the initial floating dust concentration and the pressure loss ΔP of the HEPA filter 6 in FIG. An arithmetic expression is determined by ON / OFF determination of a switch (hereinafter abbreviated as SW) 1. If SW1 is ON, the pressure drop formula ΔP = f at the initial floating dust concentration of 10,000 (pieces / CF) in Step 13
(Ta), if SW1 is OFF, pressure loss equation ΔP = g at initial floating dust concentration of 50000 (pieces / CF) in Step 14
The four-hour ta of the fan is substituted for (ta), and the pressure loss ΔP before and after the HEPA filter 6 is predicted.

As described above, the time ta of the fan 4 is determined only by setting the initial concentration of the suspended dust in the installation environment of the indoor unit A.
Predicts the pressure loss ΔP before and after the HEPA filter 6,
It is possible to reduce the detection of the decrease in the air volume due to the pressure loss.

Embodiment 4 FIG. Next, FIG. 9 is a diagram showing an example of the embodiment of the present invention, and is a control flowchart.

FIG. 9 is a control flow of the air conditioner having the configuration and operation of FIG. 1 described in the first embodiment. A control flow showing a torque increasing means of the motor 5 will be described with reference to a flowchart of FIG. I do.

In FIG. 9, the motor torque τ required for constant air volume is calculated in Step 15 from the relationship between the pressure loss and the motor torque shown in FIG. In Step 16, a motor load voltage for outputting the required torque τ is calculated from a change in the motor torque with respect to the input voltage unique to the motor. Ste
At p17, the motor supply voltage is changed by the indoor unit controller 9 by changing the motor load voltage value obtained at Step 16 by a voltage change by phase control (created by superimposing a sine wave of an AC power supply and a pulse wave) in FIG. , The torque of the motor 5 is increased in Step 18.

By changing the power supply to the motor 5, the motor torque τ can be increased, the air volume can be prevented from lowering, and the performance can be maintained. Further, the HEPA filter 6 is often used in places with high cleanliness such as clean rooms and hospitals. Therefore, by maintaining the air volume, HEPA
By increasing the final pressure loss of the filter 6 (the pressure loss of the HEPA filter at the required minimum air flow), the accumulated operation time can be extended and the number of replacements can be reduced, thereby improving the maintenance.

Embodiment 5 Next, FIG. 11 is a diagram showing an example of the embodiment of the invention, and is a control flowchart.

FIG. 11 is a control flow of the air conditioner having the configuration and operation of FIG. 1 described in the first embodiment.
Regarding a control flow showing the torque increasing means of the motor 5,
This will be described with reference to the flowchart in FIG.

In FIG. 11, the motor torque τ required for keeping the air volume constant is calculated in Step 19 from the relationship between the pressure loss and the motor torque shown in FIG. In Step 20, the motor load frequency for outputting the required torque τ is calculated from the change in the motor torque with respect to the power frequency unique to the motor.

In Step 21, the motor load frequency value obtained in Step 20 is changed in frequency by an inverter device built in the indoor unit control device 9.
To increase the torque of the motor 5.

By changing the frequency of the power supply to the motor 5, the motor torque τ is increased to prevent a decrease in the air volume and maintain the performance. Further, the HEPA filter 6 is often used in places with high cleanliness such as clean rooms and hospitals. Therefore, by maintaining the air volume, HEP
The final pressure loss of the A filter 6 (the pressure loss of the HEPA filter at the required minimum air volume) is increased, and the accumulated operation time can be extended,
Maintenance can be improved by reducing the number of replacements.

Embodiment 6 FIG. Next, FIGS. 12 and 13 show an example of the embodiment of the present invention. FIG. 12 is an electric circuit diagram, and FIG. 13 is a control flowchart.

FIG. 12 shows a configuration in which a relay switch for changing the motor winding resistance is added to the indoor unit controller 9 in addition to the air conditioner having the configuration and operation of FIG. 1 described in the first embodiment. 12a, 12b, 12c, 12d are motor coil windings, 13 is a capacitor for starting a single-phase motor, 1
Reference numerals 4a, 14b, and 14c denote relay switches that are opened and closed by signals transmitted from the indoor unit controller 9, and 15 denotes a motor 5
AC power supply for driving Here, a control flow showing the torque increasing means of the motor 5 will be described with reference to a flowchart in FIG.

In FIG. 13, the motor torque τ required to keep the air volume constant is calculated in Step 23 from the relationship between the pressure loss and the motor torque shown in FIG. If the required motor torque τ is less than 20 kg · cm in Step 24, the indoor unit control device 9 closes the relay switch 14c in Step 25.

In Step 24, the required motor torque τ is 2
If 0 kg · cm or more, the process proceeds to Step 26, and it is determined whether the required motor torque τ is less than 30 kg · cm. If the required motor torque τ is less than 30 kg · cm, Step 27
Then, the relay switch 14b is closed by the indoor unit controller 9.

At Step 26, the required motor torque τ becomes 3
If it is 0 kg.cm or more, the relay switch 14a is closed by the indoor unit controller 9 in Step 28. That is,
If it is desired to increase the torque, the winding resistance value may be reduced. As described above, by changing the motor load winding resistance value by the relay switch, the motor 5 is switched in Step 29.
To increase the torque.

The coil winding resistances 12a and 12 of the motor 5
b, 12c, and 12d to change the motor torque τ
To prevent the air volume from decreasing and maintain the performance. Further, the HEPA filter 6 is often used in places with high cleanliness such as clean rooms and hospitals. Therefore, by maintaining the air volume, the final pressure loss of the HEPA filter 6 (the pressure loss of the HEPA filter at the required minimum air volume) can be increased, the accumulated operation time can be extended, and the maintenance frequency can be improved by reducing the number of replacements. it can.

Embodiment 7 FIG. Next, FIG. 14 is a control flow of the air-conditioning apparatus having the configuration and operation of FIG. 1 described in the first embodiment, and a control flow showing a signature alarm control for notifying the replacement time of the HEPA filter 6 will be described. This will be described with reference to the flowchart in FIG.

In FIG. 14, in Step 30, the limit value τmax of the motor torque is set to 45 kg · cm. In Step 31, if the required motor torque τ calculated by the indoor unit control device 9 is less than the limit motor torque τmax, the process shifts to Step 32 and normal operation is continued. Step
31 and the required motor torque τ is the limit motor torque τma
If x is greater than or equal to x, an exchange sign is issued to notify the replacement time of the HEPA filter 6 in Step 33. This alarm display is transmitted via the transmission line 11 to a host system such as a remote controller or a personal computer so that the administrator can easily see it.

By issuing the HEPA filter replacement sign, it is possible to clarify the filter replacement time and improve the maintainability.

Embodiment 8 FIG. Next, FIG. 15 is a control flow of the air-conditioning apparatus having the configuration and operation of FIG. 1 described in the first embodiment, and is based on the elapsed time from the start of the signature issuance notifying the replacement timing of the HEPA filter 6. A control flow showing the operation control will be described with reference to a flowchart in FIG.

In FIG. 15, the timer t is set in Step 34.
Set b to 250 hours. HEPA at Step35
When the filter change sign is detected, if the fan 4 is rotating in Step 36, the fan 4 time t0 from the start of the HEPA filter change sign issuance is counted in Step 37. If the fan 4 has stopped in Step 36, the t0 count is suspended in Step 38. Step39
If t0 is less than tb, the process proceeds to Step 35. t
If 0 is equal to or greater than tb, the indoor unit A is forcibly stopped in Step 40.

As described above, if the time of the fan 4 exceeds the set time after the motor torque exceeds the limit motor torque, the indoor unit A
, The overload of the motor 5 due to an increase in pressure loss can be prevented, and the temperature of the motor 5 can be prevented from rising. Further, even when the administrator has overlooked the filter replacement sign, the filter replacement time can be clarified by the forced stop of the indoor unit.

Embodiment 9 FIG. 16 and 17 show an example of the embodiment of the present invention. FIG. 16 shows an air channel plate 16 having a U-shape and having a larger air channel area on the outlet side than on the inlet side. FIG. 3 is a structural diagram drawn by trigonometry. FIG. 16A is a top view, FIG. 16B is a side view, and FIG.
6 (c) is an end view. FIG. 17 is a structural diagram when the air path plate 16 is attached to the indoor unit A. By adopting a gentle inclination structure like the air path plate 16 in FIG. 16, rapid expansion can be eliminated, and separation can be suppressed by selecting an optimum diffuser efficiency, and the air path pressure loss can be reduced.

As described above, the air path pressure loss changes depending on the shape of the air path plate 16, but the length of the air path plate 16 in the flow direction is limited to, for example, 300 mm or less. It is necessary to optimize the inclination angle by taking the maximum. In this embodiment, the inclination angle θ in FIG. Therefore, it is possible to reduce the noise value generated due to the boundary separation and the motor load due to the decrease in the air passage pressure loss.

[0055]

As described above, according to the air conditioner according to the first aspect of the present invention, even if the pressure loss increases due to clogging due to long-term use of the HEPA filter, it is possible to prevent a decrease in air volume and to improve the capacity. Can be maintained. Also, HEPA
Filters are often used in clean rooms and hospitals and other places with high cleanliness.
The final pressure loss of the HEPA filter can be increased, the accumulated operation time can be extended, and the number of filter replacements can be reduced, thereby improving maintainability.

According to the air conditioner according to the second aspect of the present invention, by installing the pressure sensors before and after the HEPA filter, it is possible to accurately detect the decrease in the air volume due to the pressure loss before and after the HEPA filter.

According to the air conditioner according to the third aspect of the present invention, the pressure loss before and after the HEPA filter is predicted by the time of the fan only by setting the initial suspended dust concentration in the installation environment of the indoor unit, and the air volume is reduced by the pressure loss. Detection can be inexpensive.

According to the air conditioner of the fourth aspect, by changing the power supply to the motor, the motor torque can be increased, the air volume can be prevented from lowering, and the performance can be maintained. In addition, HEPA filters are often used in places with high cleanliness, such as clean rooms and hospitals.
By maintaining the air volume, the final pressure loss of the HEPA filter can be increased, the accumulated operation time can be extended, and the maintenance frequency can be improved by reducing the number of filter replacements.

According to the air conditioner of the fifth aspect, the motor torque can be increased by changing the power supply frequency to the motor, the air volume can be prevented from lowering, and the performance can be maintained. In addition, since HEPA filters are often used in places with high cleanliness, such as in clean rooms and hospitals, by maintaining the air volume, the final pressure loss of the HEPA filters can be increased, the cumulative operating time can be extended, and the number of filter replacements can be increased. , The maintenance can be improved.

According to the air conditioner of the sixth aspect, by changing the coil winding resistance of the motor, the motor torque can be increased, the air volume can be prevented from lowering, and the performance can be maintained. In addition, since HEPA filters are often used in places with high cleanliness, such as in clean rooms and hospitals, by maintaining the air volume, the final pressure loss of the HEPA filters can be increased, the cumulative operating time can be extended, and the number of filter replacements can be increased. , The maintenance can be improved.

According to the air conditioner pertaining to the seventh aspect of the invention, the HEPA filter replacement sign is issued, whereby the filter replacement time can be clarified, and the maintainability is improved.

According to the air conditioner of the eighth aspect, if the fan time exceeds the set time after the limit motor torque is exceeded, the indoor unit is forcibly stopped.
An overload of the motor due to an increase in pressure loss can be prevented, and a rise in motor temperature can be prevented. Further, even if the administrator has overlooked the filter replacement sign, the filter replacement time can be clarified by the forced stop of the indoor unit, and the maintainability is improved.

[Brief description of the drawings]

FIG. 1 is a structural sectional view according to a first embodiment.

FIG. 2 is an air volume-pressure loss characteristic diagram of the HEPA filter according to the first embodiment.

FIG. 3 is a control flowchart illustrating a relationship between a pressure loss and an air volume according to the first embodiment.

FIG. 4 is a characteristic diagram of an increase in air flow with respect to an increase in pressure loss of the HEPA filter according to the first embodiment.

FIG. 5 is a diagram illustrating a relationship between an increase in pressure loss and a motor torque in the case where the air volume is constant according to the first embodiment.

FIG. 6 is a control flowchart illustrating a pressure loss detecting means before and after a HEPA filter according to a second embodiment.

FIG. 7 is a control flowchart showing a pressure loss detecting means before and after the HEPA filter in a third embodiment.

FIG. 8 is a diagram illustrating a relationship between a fan time and a HEPA filter pressure loss due to a change in initial suspended dust concentration in the third embodiment.

FIG. 9 is a control flowchart showing a motor torque increasing means according to the fourth embodiment.

FIG. 10 is a voltage change diagram by phase control of an AC power supply according to a fourth embodiment.

FIG. 11 is a control flowchart showing a motor torque increasing means according to the fifth embodiment.

FIG. 12 is an electric circuit diagram according to a sixth embodiment.

FIG. 13 is a control flowchart showing a motor torque increasing means according to a sixth embodiment.

FIG. 14 is a control flowchart showing an operation of issuing a filter replacement sign in the seventh embodiment.

FIG. 15 is a control flowchart showing forcible stoppage of an indoor unit at an elapsed time from the issuance of a filter replacement sign in the eighth embodiment.

FIG. 16 is a structural diagram of an air path plate according to a ninth embodiment.

FIG. 17 is a structural diagram of an indoor unit in a state where an air path plate according to Embodiment 9 is attached.

[Explanation of symbols]

A indoor unit, A1, A2 chamber, 1 outer frame, 2 heat exchanger, 3 fan casing, 4 fan, 5 motor, 6 HEPA filter, 7, 8 pressure sensor, 9
Indoor unit control device, 10 floating dust, 11 transmission line, 12
a to 12d motor coil windings, 13 starting capacitors, 14a to 14c relay switches, 15 AC power supplies, 16 airflow boards.

Claims (8)

[Claims] 1. A blower assembly comprising an air suction port, a fan, a fan casing, and a motor installed at a back portion, and a heat exchanger for cooling or heating suction air between the suction port and the blower assembly. And a high-efficiency particle air filter for capturing dust contained in air blown out from the fan casing outlet, and an outlet side chamber having an outlet in contact with the ceiling surface. In the ceiling cassette type air conditioner, a detecting means for detecting a pressure loss that increases due to clogging of the high-efficiency particle air filter with clogged dust is provided. An air conditioner comprising control means for raising the pressure. 2. The air conditioner according to claim 1, wherein a pressure sensor is provided before and after the high-efficiency particulate air filter as the pressure loss detecting means. 3. The method according to claim 2, wherein the pressure loss detecting means predicts an amount of dust trapped by the high-efficiency particulate air filter in accordance with an initial suspended dust concentration in an installation environment of the ceiling cassette type air conditioner, The air-conditioning apparatus according to claim 1, further comprising a timer for counting pressure, and a control means for calculating a pressure loss of the high-efficiency particulate air filter in a time series from the timer and the amount of captured dust. 4. The air conditioner according to claim 1, further comprising a voltage change control unit based on phase control as the motor torque increase control. 5. The air-conditioning apparatus according to claim 1, further comprising a power supply frequency change control unit by inverter control as the motor torque increase control. 6. The air conditioner according to claim 1, further comprising a means for controlling a change in a winding resistance of the motor by a relay switch as the torque increase control of the motor. 7. The air conditioner according to claim 1, further comprising control means for setting a torque limit value of the motor, and transmitting a filter replacement sign to a management system when the torque reaches the limit value. 8. The apparatus according to claim 1, further comprising control means for counting a timer from the start of transmission of the filter replacement sign and stopping the ceiling cassette type air conditioner when the timer has elapsed for a set time or more. The air conditioner according to any one of the preceding claims.