JP2007107779A - Fan filter unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fan filter unit adapted to blow out sucked air from an outlet port through a filter by the effect of a fan driven by a motor and purify a manufacturing device or a clean room, in which necessity of maintenance can be determined from a current value carried to the motor. <P>SOLUTION: This fan filter unit comprises the motor 6 rotating the fan 5 provided within a main body 4 having a suction port 1 and the blow out 3, a current detection means 7 detecting current carried to the motor 6, and a first control means 8 capable of performing comparative determination of a detected current value with a preset determined value. When the current carried to the motor 6 is out of the predetermined value, necessity of maintenance is determined. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a control device for a fan filter unit used in a manufacturing apparatus or a clean room that requires a clean environment such as a semiconductor, a liquid crystal display, and a plasma display panel.

  Conventionally, a control device for this type of fan filter unit cleans the manufacturing apparatus and clean room by blowing out sucked air as clean air from the outlet through the filter by the action of a fan driven by a motor. On the other hand, monitoring of motor abnormality and life is known in which a vibration sensor is provided in the motor and an alarm signal is output when the value of the vibration sensor exceeds a predetermined value (see, for example, Patent Document 1).

Another method is known in which a wind speed sensor is provided inside the fan filter unit, and an abnormality of the fan filter unit is determined based on whether or not the detected value of the wind speed sensor is within a set value (for example, Patent Document 2). reference).
JP-A-7-243682 Utility Model Registration No. 2529381

  In such a conventional fan filter unit control device, it is assumed that when the fan fixing screw is loosened or the fan falls off, only the motor shaft rotates and vibrations are reduced. There is a problem that it is difficult to detect a failure, and a failure detection of a motor that can cope with a fan dropout phenomenon is required.

  In addition, since motor failure is monitored by vibration, there are issues when multiple fan filter units are connected in parallel or affected by vibrations of other devices. There is a need to detect motor failures that are difficult to receive.

  Also, when judging the abnormality of the fan filter unit based on the wind speed, it is assumed that most of the abnormalities detected when there are many dusts in the usage environment will clog the filter and repeatedly notify the abnormality in a short period of time. There is a problem that anomaly reporting is easily neglected, and there is a demand for motor failure detection.

  In addition, because vibration and wind speed failure judgment conditions are fixed values, there is a problem that it is difficult to cope with installation environment and operation settings, and motor failure detection that can accommodate installation environment and operation settings is required. Yes.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a fan filter unit that can determine the necessity of maintenance from the value of a current flowing to a motor.

  Moreover, it aims at providing the fan filter unit which enabled it to alert | report a maintenance sign.

  It is another object of the present invention to provide a fan filter unit that can notify a maintenance sign by visual display.

  It is another object of the present invention to provide a fan filter unit that can notify a maintenance sign by auditory transmission.

  It is another object of the present invention to provide a fan filter unit capable of guiding a maintenance sign.

  It is another object of the present invention to provide a fan filter unit that can transmit a maintenance sign to other devices.

  Moreover, it aims at providing the fan filter unit which enabled it to move an alerting | reporting means to arbitrary places.

  Also, a fan filter that can determine whether the value of the current flowing to the motor has deviated from the upper or lower limit value relative to a predetermined value, identify a part that is predicted to require maintenance, and notify a maintenance sign The purpose is to provide units.

  It is another object of the present invention to provide a fan filter unit capable of notifying a maintenance sign by correcting a predetermined value in accordance with a signal from a current detection means during initial operation.

  It is another object of the present invention to provide a fan filter unit that can notify a maintenance sign while holding a predetermined value corrected by an auxiliary power supply means even when the power is lowered.

  It is another object of the present invention to provide a fan filter unit which can avoid a loss of a predetermined value corrected even when the power supply is reduced or the power supply is stopped and which can notify a maintenance sign.

  It is another object of the present invention to provide a fan filter unit that counts the time during which the current flowing through the motor deviates from a predetermined value and can notify a maintenance sign when the current exceeds a set count.

  It is another object of the present invention to provide a fan filter unit that can notify a maintenance sign while changing the notification method according to the count time of the timer function.

  Another object of the present invention is to provide a fan filter unit in which a predetermined value is changed according to the number of motor revolutions so that a maintenance sign can be notified.

  It is another object of the present invention to provide a fan filter unit that can change a predetermined value according to a power supply voltage and notify a maintenance sign.

  It is another object of the present invention to provide a fan filter unit that can notify a maintenance sign while controlling on / off of other devices during the maintenance sign notification.

  It is another object of the present invention to provide a fan filter unit that can determine the necessity of maintenance from the combined current value flowing to the motor even in a device having a plurality of motors.

  In order to achieve the above object, the fan filter unit of the present invention has a current detecting means for detecting the current flowing to the motor, and a control means for comparing the detected current value with a predetermined value to determine the necessity of maintenance. It is set as the structure provided with.

  By this means, a fan filter unit can be obtained that can determine the necessity of maintenance from the value of the current flowing to the motor.

  In addition, the fan filter unit of the present invention includes an informing means for informing a maintenance sign in order to achieve the above object.

  Thereby, the fan filter unit which can alert | report a maintenance sign is obtained.

  In order to achieve the above object, the fan filter unit of the present invention is configured such that the notification means is a display means for performing visual display.

  Thereby, the fan filter unit which can alert | report the maintenance sign by visual display is obtained.

  Further, in order to achieve the above object, the fan filter unit of the present invention is a reporting means using auditory transmission by sound.

  Thereby, the fan filter unit which can alert | report the maintenance sign by auditory transmission is obtained.

  In order to achieve the above object, the fan filter unit of the present invention is configured such that the notification means is an audio means using audio transmission.

  As a result, a fan filter unit capable of guiding the maintenance sign is obtained.

  Further, in order to achieve the above object, the fan filter unit of the present invention is configured such that the notifying means is a communication means that transmits a communication signal to another device.

  Thereby, a fan filter unit capable of transmitting a maintenance sign to other devices is obtained.

  In order to achieve the above object, the fan filter unit of the present invention has a divided configuration in which the notification means is movable.

  Thereby, the fan filter unit which can move a alerting | reporting means to arbitrary places is obtained.

  In order to achieve the above object, the fan filter unit of the present invention is configured to change the notification method in accordance with the value of the current flowing to the motor.

  As a result, a fan filter unit that can determine whether the value of the current flowing to the motor deviates from the upper limit value or the lower limit value with respect to a predetermined value, identify a part that is predicted to require maintenance, and provide a maintenance sign is obtained. It is done.

  In order to achieve the above object, the fan filter unit of the present invention is configured to correct a preset predetermined value in accordance with a current value at the time of initial motor operation.

  Thus, a fan filter unit capable of correcting a predetermined value set in advance and notifying a maintenance sign in accordance with a signal from the current detection means at the time of initial operation is obtained.

  In order to achieve the above object, the fan filter unit of the present invention has a configuration in which auxiliary power supply means is provided in the power supply of the control means.

  As a result, a fan filter unit capable of notifying the maintenance sign while maintaining the predetermined value corrected by the auxiliary power supply means even when the power is lowered can be obtained.

  In order to achieve the above object, the fan filter unit of the present invention includes a storage unit that stores a corrected predetermined value.

  As a result, it is possible to obtain a fan filter unit that can avoid a loss of a predetermined value that is corrected even when the power supply is reduced or the power supply is stopped, and that can notify a maintenance sign.

  Further, the fan filter unit of the present invention is configured to have a timer function for counting time in order to achieve the above object.

  As a result, even if the current flowing through the motor exceeds a predetermined value, a fan filter unit is obtained that can stand by without notifying the maintenance sign as long as it does not reach the set count, and can notify the maintenance sign when it exceeds the set count. It is done.

  In addition, the fan filter unit of the present invention is configured to change the notification method in order to achieve the above object.

  As a result, a fan filter unit that can notify the maintenance sign while changing the notification method according to the count time of the timer function is obtained.

  In order to achieve the above object, the fan filter unit of the present invention is configured to set a predetermined value in accordance with the rotational speed detection means for detecting the rotational speed of the motor and the rotational speed of the motor.

  As a result, a fan filter unit is obtained in which a predetermined value is changed according to the motor rotation speed so that a maintenance sign can be notified.

  In order to achieve the above object, the fan filter unit of the present invention is configured to set a predetermined value according to the voltage detection means for detecting the voltage applied to the motor and the voltage.

  As a result, a fan filter unit capable of changing a predetermined value according to the power supply voltage and notifying a maintenance sign is obtained.

  In order to achieve the above object, the fan filter unit of the present invention is configured to have an interlocking means for transmitting a signal to another device and a function for driving the interlocking means.

  As a result, a fan filter unit can be obtained in which the maintenance sign can be notified while other devices are started and stopped during the maintenance sign notification.

  In order to achieve the above object, the fan filter unit of the present invention has a configuration in which current detection means is arranged at a position where the combined current of a plurality of motors can be detected.

  As a result, a fan filter unit can be obtained that can determine the necessity of maintenance from the combined current value flowing to the motor even in a device having a plurality of motors.

  According to the present invention, the current detection means for detecting the current flowing to the motor and the control means for making a comparison judgment between the detected current value and a preset predetermined value are provided, and maintenance is required from the current value flowing to the motor. Therefore, it is possible to provide a fan filter unit that can determine the necessity of maintenance when the current flowing to the motor deviates from a predetermined value.

  Further, since the maintenance sign can be notified by the notification means, a fan filter unit that can easily know the necessity of maintenance can be provided.

  In addition, since the notification means is used as a display means for visual display, and a maintenance sign by visual display can be notified, it is possible to provide a fan filter unit that can easily know the necessity of maintenance by confirming the appearance.

  In addition, since the notification means is an alarming means using auditory transmission by sound so that a maintenance sign by auditory transmission can be notified, a fan filter unit is provided that can easily know the necessity of maintenance by approaching the surroundings it can.

  In addition, since the notification means is a voice means using voice transmission so that the maintenance sign can be guided, it is possible to provide a fan filter unit that can know the necessity of easy maintenance and reliable maintenance information.

  In addition, since the notification means is a communication means that transmits a communication signal to another device so that a maintenance sign can be transmitted to the other device, a fan that can easily know the necessity of maintenance from a remote location. A filter unit can be provided.

  In addition, because the notification means has a movable division configuration, it can be moved to any location, so there is no need to perform maintenance without affecting the installation environment, noise, and external light in places where it is difficult to confirm the appearance. Can provide a fan filter unit.

  In addition, since it was determined whether the current value flowing to the motor deviated from the upper and lower limit values with respect to the predetermined value, it was possible to identify the part that is predicted to require maintenance and to notify the maintenance sign, A fan filter unit that can shorten the maintenance time can be provided.

  In addition, a predetermined value is corrected according to the signal of the current detection means at the time of initial operation so that a maintenance sign can be notified. It is possible to provide a fan filter unit that can correct the value of the error and notify the maintenance sign and suppress malfunction.

  In addition, since the auxiliary power supply means is provided so that the maintenance sign can be notified while the auxiliary power supply means holds a predetermined value corrected even when the power supply is reduced, it occurs due to an instantaneous power failure or a short-time power failure. It is possible to provide a fan filter unit that protects a predetermined value corrected even when the power is lowered and can avoid data loss.

  In addition, a storage means is provided to prevent loss of a predetermined value corrected even when the power supply is reduced or the power supply is stopped, and the maintenance sign can be notified. It is possible to provide a fan filter unit that protects a predetermined value that is corrected even when the power supply is lowered or power supply is stopped, and can avoid data loss.

  In addition, since the time when the current flowing through the motor deviates from the predetermined value is counted and exceeds the set count, the maintenance sign can be notified, so erroneous recognition due to transient load fluctuations that do not require maintenance It is possible to provide a fan filter unit capable of knowing the necessity of maintenance while suppressing the above.

  In addition, since the maintenance method can be notified while changing the notification method according to the count time of the timer function, it is possible to judge the urgency of maintenance, especially when multiple units are installed, It is possible to provide a fan filter unit that can easily determine the corresponding priority when notified.

  In addition, since a rotation speed detecting means is provided and a predetermined value is changed according to the motor rotation speed so that a maintenance sign can be notified, an unnecessary maintenance sign due to a motor current fluctuation caused by a change in the motor rotation speed is provided. Thus, it is possible to provide a fan filter unit that can know the necessity of maintenance while suppressing the notification.

  In addition, a voltage detection means is provided to change the predetermined value according to the power supply voltage so that the maintenance sign can be notified, so that unnecessary maintenance sign notifications due to motor current fluctuations caused by voltage changes are suppressed. However, a fan filter unit that can know the necessity of maintenance can be provided.

  In addition, it is possible to notify the maintenance sign while interlocking means is provided so that other devices can be started and stopped while the maintenance sign is being notified. In addition, it is possible to provide a fan filter unit that can know the necessity of maintenance while approaching the normal operation of the device even during maintenance sign notification or operating as an emergency treatment operation.

  In addition, since the current detection means is arranged at a position where the combined current of the plurality of motors can be detected and the necessity of maintenance can be determined from the combined current value flowing to the motor, even in a device equipped with a plurality of motors, It is possible to provide a fan filter unit that can detect the necessity of maintenance with a simple and inexpensive configuration without providing a current detection means for each motor.

  According to the first aspect of the present invention, a motor for rotating a fan is provided in a main body having a suction port and a blower outlet, and the air sucked from the suction port of the main body is supplied with clean air from the blower outlet through a filter. The fan filter unit that blows out is configured to include a current detection unit that detects a current flowing to the motor, and a control unit that compares the detected current value with a predetermined value to determine the necessity of maintenance. Yes, the necessity of maintenance can be determined from the value of the current flowing to the motor.

  Further, the invention according to claim 2 is configured to have a notification means, and can notify a maintenance sign.

  According to a third aspect of the present invention, the notification means is configured as a display means for performing visual display, and a maintenance sign by visual display can be notified.

  In the invention according to claim 4, the notifying means is configured as an issuing means using auditory transmission by sound, and a maintenance sign by auditory transmission can be notified.

  According to a fifth aspect of the present invention, the notification means is a voice means using voice transmission, and can provide a maintenance sign.

  Further, in the invention described in claim 6, the notification means is configured as a communication means for transmitting a communication signal to another device, and a maintenance sign can be transmitted to the other device.

  Further, the invention described in claim 7 has a dividing configuration in which the notification means can be moved, and the notification means can be moved to an arbitrary place.

  The invention described in claim 8 is configured to change the notification method according to the value of the current flowing to the motor, and whether the value of the current flowing to the motor deviates from the upper or lower limit value with respect to a predetermined value. Can be identified, a part that is predicted to require maintenance is identified, and a maintenance sign can be notified.

  The invention according to claim 9 is configured to correct a predetermined value in accordance with a current value at the time of initial operation of the motor, and according to a signal of current detection means at the time of initial operation. The maintenance sign can be notified by correcting a predetermined value set in advance.

  According to a tenth aspect of the present invention, the power supply of the control means is provided with an auxiliary power supply means, and a maintenance sign is maintained while the auxiliary power supply means holds a predetermined value corrected even when the power supply is lowered. Can be notified.

  The invention described in claim 11 comprises a storage means for storing the corrected predetermined value. A loss of a predetermined value corrected even when the power supply is reduced or the power supply is stopped can be avoided and a maintenance sign can be notified.

  The invention described in claim 12 is configured to have a timer function for counting time. When the current flowing through the motor deviates from a predetermined value is counted and exceeds a set count, maintenance is performed. The sign can be notified.

  The invention according to claim 13 is configured to change the notification method, and can notify the maintenance sign while changing the notification method according to the count time of the timer function.

  The invention described in claim 14 is configured to set a predetermined value according to the rotational speed of the motor and the rotational speed detecting means for detecting the rotational speed of the motor. The maintenance sign can be notified by changing the value.

  According to a fifteenth aspect of the present invention, the voltage detecting means for detecting the voltage applied to the motor and the predetermined value are set according to the voltage, and the predetermined value is changed according to the power supply voltage. The maintenance sign can be notified.

  Further, the invention described in claim 16 is configured to have a mechanism for transmitting a signal to another device and a function for driving the device, so that the other device can be started and stopped during the maintenance sign notification. A maintenance sign can be notified while controlling.

  The invention according to claim 17 is configured such that a current detection means is arranged at a position where the combined current of a plurality of motors can be detected, and even in an apparatus equipped with a plurality of motors, maintenance is performed from the combined current value flowing to the motor. The necessity of can be judged.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1, a motor 6 for rotating a fan 5 is arranged inside a main body 4 having an air outlet 3 formed through a suction port 1 and a filter 2 for removing dust. , The air sucked from the suction port 1 is dust-removed by the filter 2 and blown out as clean air from the blower outlet 3 to purify the interior of the clean room and the manufacturing apparatus (not shown) where the main body 4 is installed.

  Further, the current flowing to the motor 6 is detected by the current detection means 7, and this current value is compared with a predetermined value preset by the first control means 8 as the control means and deviates from the predetermined value. When the notification means 9 operates, the control unit 10 is configured to notify the maintenance sign. The current detection means 7 only needs to be able to detect a current, and includes a current transformer, a shunt resistor, and the like. The control unit 10 includes current detection means 7, first control means 8, and notification means 9.

  In the above configuration, the necessity of maintenance can be determined when the current flowing to the motor 6 deviates from a predetermined value.

  Further, since the maintenance sign is notified by the notification means 9, the necessity of maintenance can be easily known.

  Further, the notification means 9 is replaced with a display means typified by a light emitting LED, a lamp or a liquid crystal display, so that a maintenance sign by visual display is notified.

  In the above configuration, it is possible to easily know the necessity of maintenance by confirming the appearance.

  Further, the notification means 9 is replaced with a notification means represented by a buzzer or chime that generates sound, and a maintenance sign by auditory transmission is notified.

  In the above configuration, the necessity of maintenance can be easily known by approaching the surroundings.

  Further, the notification means 9 is replaced with voice means typified by a speaker, and the maintenance sign is informed by using voice transmission.

  In the above configuration, the necessity of easy maintenance and reliable maintenance information can be known.

  Further, the notification means 9 is replaced with a communication means represented by an electromagnetic switch, a general-purpose communication device, or a transistor, and a maintenance sign is transmitted to other devices by a communication signal.

  In the above configuration, the necessity of maintenance can be easily known from a remote location.

(Embodiment 2)
As shown in FIG. 2, the notification unit 9 is divided from the control unit 10 and can be moved to an arbitrary place. The control unit 10 includes current detection means 7 and first control means 8.

  In the above configuration, even when the main body 4 is installed in a place where it is difficult to confirm the appearance, or in an environment where it is difficult to confirm the maintenance sign due to ambient noise and external light, the notification means 9 is placed in a place that is not affected by the surrounding environment. You can move easily and know the need for maintenance.

(Embodiment 3)
As shown in FIG. 3, the second control means 11 is configured to determine whether the value of the current flowing to the motor 6 deviates from the upper and lower limit values with respect to a predetermined value, and to change the notification method.

  In the above configuration, when the upper limit value of the predetermined value is not reached, it is expected that the resistance increases due to wear of the bearings, or that the fan 5 is deformed to contact with the surroundings and the load on the motor 6 is increased. The percentage of maintenance is “replacement work”, and if the lower limit of the predetermined value is not reached, the mounting screw of the fan 5 is loose and the load on the motor 6 is reduced due to the blades falling off. The maintenance ratio tends to increase “confirmation / adjustment work”, and the notification means 9 indicates whether the current value of the motor 6 deviates from the upper or lower limit value with respect to a predetermined value before the maintenance work. Since it can be recognized, maintenance preparation and work time can be reduced.

(Embodiment 4)
As shown in FIG. 4, the third control unit 12 is configured to correct a predetermined value according to the current value during the initial operation of the motor 6.

  In the above configuration, the predetermined value is corrected so that the value of the current flowing when the motor 6 is driven for the first time becomes the center value of the range of the predetermined value, so that the wall or object is close in the installation state of the main body 4. In some cases, the suction space is reduced and the current flowing to the motor 6 decreases, or the predetermined value is set according to the value of the current flowing to the motor 6 that changes due to a change in the installation air pressure or a differential pressure inside and outside the machine due to the installation of the duct. The correction can be corrected and a maintenance sign can be notified, and malfunction can be suppressed.

  In the fourth embodiment, an example in which the value of the current flowing through the motor 6 is corrected to the center value of the predetermined value has been described. However, the upper limit value is limited to a range that can be corrected for the purpose of protecting the motor 6. It may be provided.

(Embodiment 5)
As shown in FIG. 5, the auxiliary power supply means 13 is arranged in the power supply supplied to the third control means 12, and is configured to supply electricity from the auxiliary power supply means 13 when the voltage drops. The auxiliary power supply means 13 may be any battery as long as it can supply electricity.

  In the above configuration, since the power is supplied from the auxiliary power supply means 13 in the case of a voltage drop caused by an instantaneous power failure or a short-time power failure, the third control means 12 can be driven as usual, so that the corrected predetermined value is protected. And it can be avoided from data loss.

(Embodiment 6)
As shown in FIG. 6, a storage unit 14 that holds data is arranged to store a corrected predetermined value even when power supply is stopped. The storage unit 14 only needs to hold data, and includes a memory, an EEPROM, and the like.

  In the above configuration, all the functions of the configured components are stopped when a voltage drop or power supply stop caused by a power failure or long-term maintenance is stopped, but the corrected predetermined value stored in the storage means 14 is Data is read by the third control means 12 when the power supply is started next time, and it is possible to return to the state before the function stop, thus avoiding data loss.

(Embodiment 7)
As shown in FIG. 7, it has the 4th control means 15 which has the timer function which counts time, counts the time when the electric current which flows into the motor 6 has remove | deviated from predetermined value, and when it becomes more than setting count, a maintenance sign It is comprised so that it may alert | report.

  In the above configuration, even if the current flowing through the motor 6 exceeds a predetermined value, the fourth control unit 15 stands by without notifying the maintenance sign as long as the current does not reach the set count. Since it is driven and a maintenance sign is notified, it is possible to know the necessity of maintenance while suppressing misrecognition due to temporary load fluctuations that do not require maintenance.

(Embodiment 8)
As shown in FIG. 8, it has the 5th control means 16 with the function to change a notification method, and it is comprised so that a maintenance sign may be notified, changing a notification method according to the count time of a timer function. .

  In the above configuration, since the notification method changes according to the count time, it is possible to determine the urgency of maintenance. In particular, when a plurality of devices are installed and a maintenance sign is notified at the same time, the corresponding priority order is easily determined. be able to.

(Embodiment 9)
As shown in FIG. 9, it has the rotation speed detection means 17 which detects the rotation speed of the motor 6, and the 6th control means 18 which set the predetermined value according to the rotation speed of the motor 6, and according to the rotation speed of the motor A predetermined value is changed, and a maintenance sign is notified. As the rotation speed detection means 17, it is sufficient if the rotation speed of the motor can be detected, and there is a tachometer generator or the like.

  In the above-described configuration, it is possible to know the necessity of maintenance while suppressing notification of unnecessary maintenance signs caused by motor current fluctuations caused by changes in the motor rotation speed.

(Embodiment 10)
As shown in FIG. 10, it has a voltage detection means 19 for detecting a voltage applied to the motor 6 and a seventh control means 20 for setting a predetermined value according to the voltage, and the predetermined value according to the power supply voltage. It is configured to change and notify the maintenance sign.

  In the above-described configuration, it is possible to know the necessity of maintenance while suppressing notification of unnecessary maintenance signs due to motor current fluctuations caused by voltage changes.

(Embodiment 11)
As shown in FIG. 11, it has an interlocking means 21 for transmitting a signal to another device and an eighth control means 22 to which a function for driving the interlocking device 21 is added. It is configured to notify a maintenance sign while stopping. As the interlocking means 21, it is sufficient that signals can be transmitted to other devices, and there are a relay, an electromagnetic switch and the like.

  In the above configuration, operation of necessary equipment during maintenance sign notification or unnecessary stop of equipment is performed so that maintenance equipment can be brought close to normal operation even during maintenance sign notification, or while operating as an emergency treatment operation. Can know the need.

(Embodiment 12)
As shown in FIG. 12, the main body 4 has a first motor 23 and a second motor 24, and the current detection means 7 is arranged at a position where the combined current of the motor can be detected, and the combined current value flowing to the motor Configured to determine the need for maintenance.

  In the above configuration, even in a device including a plurality of motors, the necessity of maintenance can be detected with a simple and inexpensive configuration without the need to provide the current detection means 7 for each motor.

  The present invention can also be applied to the use of a motor maintenance detection of a ventilation fan that performs 24-hour regular ventilation in a house.

The block diagram which shows the structure of Embodiment 1 of this invention The block diagram which shows the structure of Embodiment 2 of this invention The block diagram which shows the structure of Embodiment 3 of this invention Block diagram showing the configuration of the fourth embodiment of the present invention Block diagram showing the configuration of the fifth embodiment of the present invention Block diagram showing the configuration of the sixth embodiment of the present invention Block diagram showing the configuration of the seventh embodiment of the present invention Block diagram showing the configuration of the eighth embodiment of the present invention A block diagram showing a configuration of a ninth embodiment of the present invention Block diagram showing the configuration of the tenth embodiment of the present invention Block diagram showing the configuration of the eleventh embodiment of the present invention Block diagram showing the configuration of the twelfth embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Intake port 2 Filter 3 Outlet 4 Main body 5 Fan 6 Motor 7 Current detection means 8 1st control means 9 Notification means 10 Control part 11 2nd control means 12 3rd control means 13 Auxiliary power supply means 14 Storage means 15 4th control Means 16 Fifth control means 17 Rotational speed detection means 18 Sixth control means 19 Voltage detection means 20 Seventh control means 21 Interlocking means 22 Eighth control means 23 First motor 24 Second motor

Claims (17)

A current that flows to the motor in a fan filter unit that has a motor that rotates a fan in the main body having a suction port and a blower outlet, and blows clean air from the blower outlet through the filter. A fan filter unit comprising: a current detection means for detecting a current value; and a control means for comparing the detected current value with a predetermined value set in advance to determine the necessity of maintenance. The fan filter unit according to claim 1, further comprising an informing unit for informing a maintenance sign. 3. The fan filter unit control device according to claim 2, wherein the notification means is a display means for performing visual display. 3. The fan filter unit according to claim 2, wherein the informing means is an informing means using auditory transmission by sound. 3. The fan filter unit according to claim 2, wherein the notification means is a sound means using sound transmission. 3. The fan filter unit according to claim 2, wherein the notification means is a communication means for transmitting to other devices by a communication signal. The fan filter unit according to claim 2, wherein the notification unit has a movable divided configuration. The fan filter unit according to claim 2, wherein the notification method is changed in accordance with a value of a current flowing to the motor. 3. The fan filter unit according to claim 2, wherein a predetermined value set in advance is corrected in accordance with a current value at the time of initial motor operation. 10. The fan filter unit according to claim 9, further comprising auxiliary power supply means as a power supply for the control means. The fan filter unit according to claim 9, further comprising a storage unit that stores the corrected predetermined value. The fan filter unit according to claim 2, further comprising a timer function for counting time. The fan filter unit according to claim 12, wherein the notification method is changed. 3. The fan filter unit according to claim 2, wherein a predetermined value is set in accordance with a rotational speed detecting means for detecting the rotational speed of the motor and the rotational speed of the motor. 3. The fan filter unit according to claim 2, wherein a predetermined value is set in accordance with voltage detection means for detecting a voltage applied to the motor and the voltage. 3. The fan filter unit according to claim 2, further comprising an interlocking unit that transmits a signal to another device and a function for driving the interlocking unit. The fan filter unit according to any one of claims 1 to 16, wherein a current detection means is arranged at a position where the combined current of the plurality of motors can be detected.

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