JP3247580B2 - Blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower for use in a hot air heater or the like.

[0002]

2. Description of the Related Art In a hot air heater, for example, room air is sucked into a duct provided in a housing arranged in a room by a fan for blowing hot air (convection fan), and the air is blown in the duct in a duct. What is blown out from the duct while being heated by a heater such as this is generally known. In this case, in the operation of the blowing fan at the time of blowing hot air, the target rotation speed of the blowing fan is set according to, for example, the heating amount of the heater, and the rotation speed of the blowing fan is detected. Is controlled (feedback control) so that the fan speed matches the target rotation speed. Alternatively, by setting the energization amount of the blower fan according to the heating amount of the heater or the like, and energizing the blower fan at the set energization amount, the blower fan is rotated at a rotation speed corresponding to the set energization amount. In some cases. In the operation of the heater, for example, when performing temperature control, a room temperature is detected by a room temperature sensor, and the heater is heated with an amount of heating corresponding to the detected room temperature so that the detected room temperature matches the set temperature. Activate

[0003] On the other hand, for example, an air filter is usually installed at an intake port of a duct of a hot air heater as described above in order to prevent dust and dirt from entering the duct. 2. Description of the Related Art There is known an air filter in which the air filter is detachable so that a user or the like can appropriately remove the air filter and clean the air filter.

However, in the case where the air filter of the duct is detachable, the user sometimes forgets to attach the air filter removed from the duct to the duct again. If the operation is performed with the air filter removed from the duct in this way, dust and dirt will enter the duct, and in addition to the dust and dirt, foreign substances that may cause a device failure will be found inside the duct. There is a risk of intrusion into

For this reason, in the case where the air filter of the duct is detachable as described above, it is preferable to automatically detect the presence or absence of the air filter and to take appropriate measures in accordance with the detection. As a method for detecting the presence or absence of such an air filter, for example, Japanese Unexamined Patent Application Publication No.
The one disclosed in Japanese Patent No. 6413 is known.

In the publication, a switch is provided at a position where the air filter is mounted, and when the air filter is mounted, the switch is turned ON or OFF mechanically, thereby mounting the air filter. I try to detect. When the air filter is not mounted, the operation of the device is prohibited.

However, in the device disclosed in the above publication, the presence or absence of the air filter is detected by a mechanical switch. There is an inconvenience that it easily occurs.

[0008] The vicinity of the mounting location of the air filter is
Since dust and the like easily accumulate, the dust and the like may cause a contact failure of the switch, and as a result, it may not be possible to detect whether or not the air filter is attached.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an air blower which can solve the above-mentioned inconvenience and can reliably detect the presence or absence of an air filter with a simple structure which is unlikely to cause a failure or the like. I do.

[0010]

In order to achieve the above object, a first aspect of the present invention is to provide a ventilation path having a detachable air filter and a blower fan for generating an air flow in the ventilation path. A blower comprising: a rotation speed detector for detecting the rotation speed of the blower fan; and fan control means for controlling the energization of the blower fan so that the rotation speed detected by the rotation speed detector matches the target rotation speed. in the device, a current amount detecting means for detecting the amount of current supplied to the blower fan when the detected speed is consistent with the target speed, corresponding to the target rotational speed and the detected current amount of vent coulometric detector The value of the ratio to the predetermined reference energizing amount (detected energizing amount /
And a filter mounted state detecting means for determining that the air filter is not mounted when the reference current amount becomes equal to or more than a predetermined value .

Further, the filter mounting state detecting means determines that the air filter is in a clogged state when the amount of current detected by the amount of current detecting means is smaller than the reference amount of current by a predetermined amount or more. It is characterized by.

According to a second aspect of the present invention, there is provided a ventilation path in which an air filter is detachably provided, a blower fan for generating an air flow in the ventilation path, and a power supply amount to the blower fan. A fan control means for controlling the energization of the blower fan according to the set energization amount; a rotation number detection means for detecting a rotation number of the blower fan; and a power supply to the blower fan by the fan control means. sometimes standard rotation speed of the blower fan predetermined in correspondence with the set energization amount and the detected rotational speed by the rotational speed detecting means and
And a filter mounted state detecting means for determining that the air filter is not mounted when the value of the ratio (detected rotational speed / reference rotational speed) becomes equal to or less than a predetermined value. Features.

[0013] Further, the filter mounted state detecting means may be configured such that the air filter is clogged when the detected rotation speed becomes larger than the reference rotation speed by a predetermined amount or more when the fan control unit supplies power to the blower fan. It is characterized in that it is determined to be in a state.

According to a third aspect of the present invention, there is provided a ventilation path having a detachable air filter, a blower fan for generating an air flow in the ventilation path, and a rotation number detecting the rotation number of the blower fan. A blower, comprising: a detection unit; and a fan control unit configured to control an energization of the blower fan such that a rotation speed detected by the rotation speed detection unit matches a target rotation speed. and air volume detecting means for detecting a reference air volume which is predetermined to correspond to the target rotational speed and the detected air amount by該風amount detecting means
When the value of the ratio (detected air volume / reference air volume) becomes equal to or more than a predetermined value , a filter mounted state detecting means for determining that the air filter is not mounted is provided.

Further, the filter mounted state detecting means determines that the air filter is in a clogged state when the air flow detected by the air flow detecting means is smaller than the reference air flow by a predetermined amount or more. I do.

[0016]

[0017]

[0018]

Further, the present invention is characterized in that, in each of the above aspects, when the filter mounted state detecting means determines that the air filter is not mounted, the air filter is provided with a notifying means for notifying that fact. I do.

In each of the above aspects, when the filter mounted state detecting means determines the clogged state of the air filter, the filter mounted state detecting means determines that the air filter is clogged. At the time, a notification means for notifying the user is provided.

[0021]

According to the first aspect of the present invention, the blower fan is energized by the fan control means (feedback control) so that the detected rotation speed matches the target rotation speed.
At this time, when the air filter is not mounted,
Since the air flow rate of the blower fan increases and the load increases as compared with the time of mounting, the amount of power to the blower fan at the target rotation speed increases. Therefore, the filter mounted state detecting means, when the detected energized amount of the blower fan by the energized amount detecting means becomes larger than a reference energized amount corresponding to the target rotation speed by a predetermined amount or more, the air filter is not mounted. Judge that there is . More specifically, the detected energization amount and
The value of the ratio to the standard energizing amount (detected energizing amount / standard energizing amount)
When the air filter exceeds the set value, the air filter is
Judge that there is.

In this case, if the air filter is clogged when the air filter is mounted, the amount of air supplied to the blower fan decreases because the airflow of the blower fan decreases and the load decreases, contrary to the above. . Therefore, the filter mounting state detecting means further determines that the air filter is in a clogged state when the detected energizing amount of the blower fan becomes smaller than a reference energizing amount corresponding to the target rotation speed by a predetermined amount or more. . Therefore, the detection of the unmounted state of the air filter and the detection of the clogged state are performed using a common configuration.

Next, according to a second aspect of the present invention, the blower fan is controlled to be energized at the set energized amount by the fan control means. At this time, when the air filter is not mounted, it is mounted. Since the air flow rate of the blower fan increases and the load increases, the rotation speed of the blower fan at the set energization amount decreases. Therefore, the filter mounted state detecting means determines that the air filter is not mounted when the rotation speed detected by the rotation speed detecting means becomes smaller than a reference rotation speed corresponding to the set energization amount by a predetermined amount or more. I do . More specifically, the detected rotation speed
The value of the ratio between the rotation speed and the reference rotation speed (detection rotation speed / reference rotation speed) is
The air filter is not installed when it falls below the specified value.
Is determined to be.

In this case, if the air filter is clogged when the air filter is mounted, on the contrary, the flow rate of the blower fan is reduced and the load is reduced, so that the rotation speed of the blower fan is increased. Therefore, the filter mounted state detecting means further determines that the air filter is in a clogged state when the detected rotation speed of the blower fan becomes larger than a reference rotation speed corresponding to the set energization amount by a predetermined amount or more. . Therefore, the detection of the unmounted state of the air filter and the detection of the clogged state are performed using a common configuration.

Next, according to a third aspect of the present invention, similarly to the first aspect, the blower fan is controlled to be energized to a target rotational speed. At this time, when the air filter is not mounted, The air volume of the blower fan becomes larger as compared with the time of the installation. Therefore, when the air filter is not mounted, the air filter is determined to be not mounted when the air flow detected by the air flow detecting means becomes larger than a reference air flow corresponding to the target rotation speed by a predetermined amount or more . More specifically,
The value of the ratio between the detected air volume and the reference air volume (detected air volume / standard air volume)
When the air filter reaches a specified value, the air filter is
Is determined to be in a state.

In this case, if the air filter is clogged when the air filter is mounted, the air volume of the blower fan is reduced, contrary to the above. Therefore, the filter mounted state detecting means further determines that the air filter is in a clogged state when the detected air volume becomes smaller than the reference air volume corresponding to the target rotation speed by a predetermined amount or more. Therefore, the detection of the unmounted state of the air filter and the detection of the clogged state are performed using a common configuration.

[0027]

[0028]

[0029]

In the invention of each of the above aspects, when the air filter is determined to be not mounted, the user is notified by the notification means to recognize that the air filter should be mounted. Let it. Further, when it is determined that the air filter is clogged, the user is notified of the necessity of cleaning the air filter by performing notification by the notification means in accordance with the detection.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the first embodiment of the blower of the present invention will be described with reference to FIGS. FIG. 1 is a system configuration diagram of a hot air heater equipped with a blower of the present embodiment, FIG. 2 is a perspective view of the hot air heater viewed from the front side, and FIG. 3 is a rear view of the hot air heater. FIG. 4 is a perspective view of the hot air heater, FIG. 4 is a block diagram of a main portion of the hot air heater, and FIG. 5 is a diagram for explaining the operation of the main portion of the hot air heater.

Referring to FIGS. 1 to 3, a hot air heater 1 equipped with a blower of the present embodiment is a gas hot air heater, and a heater built in a housing 2 disposed indoors. The main body 3 includes a duct 4 (air passage), a convection fan 5 (blowing fan), a gas burner 6, a duct 7, and a gas supply pipe 8, and is controlled by a control unit 9.

The duct 4 has an air inlet 10 for taking in room air at the back of the housing 2 and a hot air outlet 11 at the lower front of the housing 2. An air filter 12 is detachably attached to the air inlet 10 to prevent dust and dirt from flowing into the duct 4. A movable louver 13 for adjusting the degree of opening is attached to the hot air outlet 11, and a gad motor 14 for driving the movable louver 13 is provided.

The convection fan 5 has a fan motor 16 whose number of revolutions increases in proportion to the supplied current, and rotating blades 17 driven to rotate by the fan motor 16.
With the rotation of 7, the room air s is drawn into the duct 4 from the air suction port 10 to generate an air flow. Then, the sucked indoor air s is mixed with the combustion exhaust gas h of the gas burner 6 incorporated in the duct 4 and heated, and is blown out from the hot air outlet 11 as hot air m. The convection fan 5 is provided with a rotation speed sensor 18 (rotation speed detecting means) for detecting the rotation speed. The rotation speed sensor 18 is configured by a Hall IC that generates a predetermined number of pulses for each rotation of the fan motor 16, and provides its output to the control unit 9.

Gas burner 6 incorporated in duct 4
Has a combustion plate 20 disposed in a combustion drum 19 and an ignition electrode 21 for igniting an air-fuel mixture disposed downstream of the combustion plate 20. The combustion cylinder 19 of the gas burner 6 communicates with the duct 4, and the combustion exhaust h is discharged into the duct 4. Further, a thermocouple 22 for detecting abnormal combustion is disposed downstream of the combustion plate 20.
Generates an electromotive force by being exposed to the combustion flame of the gas burner 6,
It is output to the control unit 9.

The duct 7 is a passage for supplying the indoor air s and the fuel gas to the gas burner 6.
And has a suction port 23 for room air s which is communicated with the inside of the combustion drum 19 and is defined in the duct 4 and is incorporated in the housing 2 and is opened at the back of the housing 2. On the way from the suction port 23 of the duct 7 to the gas burner 6,
A nozzle 24 attached to the tip of the gas supply pipe 8 is introduced. The indoor air s is sucked into the duct 7 from the suction port 23 by the rotation of the convection fan 5, and the sucked indoor air s is ejected from the nozzle 24 of the gas supply pipe 8 in the process of reaching the gas burner 6. The mixture with the gas is supplied to the gas burner 6. In addition, the suction port 23
Is covered by the air filter 12 together with the air suction port 10. A room temperature sensor 26 composed of a thermistor is attached to a location near the suction port 23 inside the duct 7, and the room temperature sensor 26 outputs an electric output corresponding to the room temperature to the control unit 9.

The gas supply pipe 8 having the nozzle 24 introduced into the duct 7 is provided with solenoid valves 27 and 28 and a proportional valve 29 in this order from the upstream side.

The solenoid valves 27 and 28 allow the fuel gas to pass in the direction of the nozzle 24 when the valve is opened by energization, and block the passage of the fuel gas when the valve is closed by stopping the energization.

The proportional valve 29 is a valve whose opening increases in accordance with the magnitude of the energizing current, and the energizing current is proportional to the amount of gas supplied to the gas burner 6.

An operation switch 31 is provided on the upper surface of the housing 2.
A room temperature setting switch 3 is provided inside an opening / closing lid 2a (see FIG. 2) provided on the upper surface of the housing 2.
2. Alarm buzzer 33 (notification means) and filter lamp 3
4 (notification means) is provided.

The operation switch 31 instructs the control unit 9 to start or end the heating operation by ON / OFF operation.

The room temperature setting switch 32 is an operation switch for setting the room temperature, and instructs the control unit 9 to raise or lower the set room temperature by, for example, 1 ° C. by a predetermined operation.

The alarm buzzer 33 notifies the user that the air filter 12 is not mounted by the alarm sound, and is driven and controlled by the control unit 9.

The filter lamp 34 informs the user that the air filter 12 is in a clogged state by turning on the lamp, and makes the user recognize that the air filter 12 needs to be cleaned. Is controlled.

Referring to FIG. 4, the control unit 9 is configured using a microcomputer or the like, and has an operation control unit 35 and a temperature control control unit 3 as its functional configuration.
6, a proportional valve control unit 37, a fan control unit 38 (fan control unit), a reference energization amount determination unit 39, an energization amount detection unit 40 (energization amount detection unit), and a filter monitoring unit 41 (filter attachment state detection unit). ing.

The operation control unit 35 controls the solenoid valves 27 and 28 and the ignition electrodes 21 based on the instruction signal of the operation switch 31, the output of the thermocouple 22, and the operation stop signal given from the filter monitoring unit 41 as described later. Is controlled.

The temperature control controller 36 determines the fuel amount (heating amount) of the gas burner 6 based on the detected room temperature by the room temperature sensor 26 and the room temperature set by the room temperature setting switch 32, and controls the determined combustion amount by a proportional valve control. Unit 37 and fan control unit 38
To be given. In this case, the temperature control controller 36 determines a larger combustion amount as the detected room temperature is lower than the set room temperature, in order to perform temperature control that brings the detected room temperature closer to the set room temperature.

The proportional valve control unit 37 determines, based on the amount of combustion provided from the temperature control unit 36, the amount of electricity to be supplied to the proportional valve 29 for supplying an amount of fuel gas corresponding to the amount of combustion. It is determined according to a table or the like, and the proportional valve 29 is energized with the determined energization amount.

The fan control section 38 supplies an amount of combustion air corresponding to the combustion amount to the gas burner 6 via the duct 7 based on the combustion amount provided from the temperature control section 36,
A target rotation speed setting unit 42 for setting a target rotation speed of the convection fan 5 for blowing hot air through the duct 4 in an amount corresponding to the combustion amount according to a predetermined data table or the like; Rotation speed and rotation speed sensor 18
And an energization amount setting unit 43 for setting the energization amount to the fan motor 16 of the convection fan 5 to match the detected rotation speed according to the feedback control law. Then, the fan control unit 38 controls the energization of the convection fan 5 by energizing the fan motor 16 with the energization amount set by the energization amount setting unit 43 so that the detected rotation speed matches the target rotation speed. Note that the target rotation speed set by the target rotation speed setting unit 42 can appropriately supply air to the gas burner 6 and blow hot air when the clean air filter 12 is normally mounted. The rotation speed is determined according to the combustion amount of the gas burner 6, and the target rotation speed increases as the combustion amount increases.

A limiting plate (not shown) for limiting the amount of air supplied is provided at the inlet of the gas burner 6 so that the supply of air to the gas burner 6 and the temperature of the hot air are simultaneously adjusted to appropriate values. By matching the opening with the rotation speed of the fan motor 16 (the rotation speed in consideration of the temperature of the hot air), the amount of air supplied to the gas burner 6 can be set to an appropriate value.

The reference energizing amount determination unit 39 determines the reference energizing amount to the fan motor 16 from the target rotational speed set by the target rotational speed setting unit 42 in accordance with a predetermined data table as shown by a solid line a in FIG. Ask. In this case, the reference energization amount indicated by the solid line a (hereinafter referred to as the reference energization amount line a) is a fan motor when the convection fan 5 is rotated at the target rotation speed in a state where the clean air filter 12 is normally mounted. 16 is set as a standard power supply amount.

The energization amount detection unit 40 sets the energization amount setting unit 4 in a state where the detected rotation speed of the convection fan 5 matches the target rotation speed.
3 based on the set energization amount output from the fan motor 16.
Detects the amount of current flowing to Incidentally, such detection of the amount of current may be performed by directly detecting the actual amount of current supplied to the fan motor 16 by the fan controller 38 using a current sensor (not shown).

The filter monitoring unit 41 determines whether or not the air filter 12 is mounted and whether the air filter 12 is clogged, based on the reference amount of electricity determined by the reference amount of electricity determination unit 39 and the amount of electricity detected by the amount of electricity detection unit 40. The first and second comparing sections 44 and 45 for monitoring the state and comparing the reference energization amount and the detected energization amount are provided.

The first comparing section 44 determines whether or not the detected energizing amount is larger than the reference energizing amount by a predetermined amount or more. Assuming that it is not mounted, a signal indicating that fact is output. More specifically, referring to FIG.
Indicates a determination line for determining whether or not the detected energization amount at each target rotational speed is greater than or equal to the reference energization amount by a predetermined amount in the present embodiment.
When the convection fan 5 is controlled to the target rotation speed in a state where the air filter 12 is not mounted, the amount of power supplied to the fan motor 16 by the fan control unit 38 when the air filter 12 is not mounted is referred to as a filter non-installation determination line b. This is determined so that the amount of electricity is above the mounting determination line b (including on the filter non-mounting determination line b). In addition, the amount of energization in the filter non-wearing determination line b is:
The value becomes larger than the reference energization amount at a predetermined ratio in proportion to the target rotation speed.

The amount of power supplied to the fan motor 16 may exceed the reference amount of power supply due to variations in the accuracy of the fan motor 16, and the like. b is set to a value larger than the reference energization amount by a predetermined amount (a value that does not occur due to variations in the fan motor 16 or the like).

Basically, the first comparing section 44 determines that the detected energizing amount to the convection fan 5 controlled to the target rotational speed is equal to or greater than the energizing amount on the filter non-attachment determination line b at the target rotational speed. Then, it is determined that the detected energizing amount is larger than the reference energizing amount by a predetermined amount or more, and the state in which the air filter 12 is not mounted is detected. In this case, in the present embodiment, the first comparing unit 44 determines, for example, that the value of the ratio of the detected energization amount to the reference energization amount (detection energization amount / reference energization amount) is equal to the energization amount in the filter non-attachment determination line b. When the ratio with respect to the energizing amount is equal to or more than the energizing amount / reference energizing amount, which is a predetermined value regardless of the target rotation speed, the detected energizing amount is equal to or more than the predetermined energizing amount. It is determined that it is large, and a signal indicating that the air filter 12 is not attached is output. And
When the first comparing section 44 outputs the above signal, the filter monitoring section 41 supplies electricity to the alarm buzzer 33 to make it sound, and also gives an operation stop signal to the operation control section 35.

The second comparing section 45 determines whether or not the detected energizing amount is smaller than the reference energizing amount by a predetermined amount or more. Assuming that the clogging has progressed to such a degree that cleaning is necessary, a signal indicating that fact is output. More specifically, with reference to FIG.
5 shows a judgment line for judging whether or not the detected energization amount is smaller than the reference energization amount by a predetermined amount or more. The judgment line c (hereinafter referred to as a clogging judgment line c) is an air filter. When the convection fan 5 is controlled to the target number of revolutions in the clogged state requiring cleaning at 12, the amount of current supplied to the fan motor 16 by the fan control unit 38 is below the clogging determination line c (clogging determination line c (Including the above). Further, the energization amount in the clogging determination line c has a value smaller than the reference energization amount at a predetermined ratio proportional to the target rotation speed.

Basically, the second comparing section 45 determines whether the detected energizing amount to the convection fan 5 controlled to the target rotational speed is equal to or less than the energizing amount on the clogging determination line c at the target rotational speed. That is, the clogging state of the air filter 12 is detected by determining that the detected energization amount is smaller than the reference energization amount by a predetermined amount or more. In this case, in the present embodiment, similarly to the first comparing unit 44, the second comparing unit 45 determines that the value of the ratio of the detected energization amount to the reference energization amount (detected energization amount / reference energization amount) is clogging. When the value of a predetermined ratio between the amount of current and the reference amount of current in the line c (current amount / reference amount of current, this value is generally different from the value of the predetermined ratio in the case of the first comparison unit 44) is equal to or less than It determines that the detected energization amount is smaller than the reference energization amount by a predetermined amount or more, and outputs a signal indicating the clogged state of the air filter 12. Then, when the second comparing section 45 outputs the above signal, the filter monitoring section 41 supplies electricity to the filter lamp 34 to turn on the filter lamp 34 and gives an operation stop signal to the operation control section 35.

[0059]

Next, the operation of the warm air heater 1 of the present embodiment will be described.

When the user turns on the operation switch 31, the operation starts under the control of the control unit 9 accordingly. At this time, the control unit 9 controls the operation control unit 35
The solenoid valves 27 and 28 are energized to open them, and the proportional valve control section 37 energizes the proportional valve 29 with a predetermined energizing amount to supply a predetermined amount of fuel gas to the gas burner 6. At the same time, the convection fan 5 is rotated at a predetermined rotation speed by the fan
To take in the air. In this state, the operation control unit 35 of the control unit 9 monitors the output of the thermocouple 22 while monitoring the output of the thermocouple 22.
1 to ignite the gas burner 6 and start its combustion.

As described above, when the combustion of the gas burner 6 starts, the temperature control controller 36 of the control unit 9 determines the gas burner based on the room temperature detected by the room temperature sensor 26 and the room temperature set by the room temperature setting switch 32 as described above. The combustion amount of No. 6 is determined from time to time and is instructed to the proportional valve control unit 37 and the fan control unit 38.

In response to this instruction, the proportional valve control section 37 energizes the proportional valve 29 with an energization amount corresponding to the instructed combustion amount, and causes the fuel gas corresponding to the combustion amount to be supplied to the gas burner 6.

Further, the fan control unit 38 supplies the gas burner 6 with an amount of air corresponding to the instructed combustion amount by the target rotation speed setting unit 42, and supplies the air to the duct 4 with the blowing amount corresponding to the combustion amount. Convection fan 5 for blowing hot air from
Set the target rotation speed of. Further, the fan control unit 38
The energizing amount setting unit 43 sets the energizing amount to the fan motor 16 so that the rotational speed detected by the convection fan 5 by the rotational speed sensor 18 matches the target rotational speed set according to the combustion amount. By controlling the energization of the fan motor 16 with the amount, the convection fan 5 is feedback-controlled to a target rotation speed corresponding to the combustion amount.

The proportional valve 29 and the fan motor 1
By the energization control of 6, the gas burner 6 burns at the combustion amount determined by the temperature control controller 36. Further, by the operation of the convection fan 5 controlled to the target rotation speed, the amount of room air s corresponding to the combustion amount of the gas burner 6 is taken into the duct 4 from the air inlet 10 through the air filter 12 and taken in. The mixed indoor air s is heated by being mixed with the combustion exhaust gas h of the gas burner 6 in the process of flowing toward the hot air outlet 11 in the duct 4, and is thus heated as the hot air outlet 11.
From the room. Then, at this time, the temperature control controller 36 determines the combustion amount of the gas burner 6 so that the detected room temperature approaches the set room temperature, so that the temperature control is performed to set the room temperature to the set room temperature.

In the operation of the warm air heater 1 as described above,
When the air filter 12 is not mounted, the air volume of the convection fan 5 controlled to the target rotation speed increases as compared with the state in which the air filter 12 is mounted, as described above. The load increases. Therefore, the fan motor 1 for controlling the convection fan 5 to the target rotation speed is used.
The amount of electricity supplied to 6 becomes larger than the state in which the air filter 12 is mounted. For example, referring to FIG. 5, when the rotation speed of the convection fan 5 is controlled to the target rotation speed Nx and the clean air filter 12 is mounted, the power supply detected by the power supply amount detection unit 40 is detected. The amount is a value near the reference energization amount Ix determined by the reference energization amount determination unit 39 corresponding to the target rotation speed Nx. On the other hand, when the air filter 12 is not mounted, the detected power amount detected by the power amount detection unit 40 is, for example, a value equal to or more than the power amount Ib on the filter non-wearing determination line b at the target rotation speed Nx. Ixb.

As described above, when the air filter 12 is not mounted, the first comparing unit 44 of the filter monitoring unit 41 compares the reference energizing amount Ix and the detected energizing amount Ixb at the target rotation speed Nx. (Ixb / Ix) is equal to or greater than the ratio (= Ib / Ix) between the reference current amount on the reference current amount line a and the current amount on the filter non-wearing determination line b. As described above, the first comparing section 44 outputs a signal indicating the non-attached state of the air filter 12, and this state is detected. Then, the filter monitoring unit 41
Is the alarm buzzer 33 according to the signal output of the first comparing section 44.
To the air filter 1
Notify the user that 2 is not mounted. Further, the filter monitoring unit 41 outputs an operation stop signal to the operation control unit 35, and at this time, the operation control unit 35
By closing the valve 8, the combustion of the gas burner 6 is stopped, and the operation of the hot air heater 1 is stopped. After that, if the user attaches the air filter 12 and turns on the operation switch 31 again, the warm air heater 1 resumes operation without any trouble.

In the operation of the warm air heater 1 with the air filter 12 mounted, if the air filter 12 is clogged, the air volume of the convection fan 5 controlled to the target rotation speed is increased. The number of air filters 12 is smaller than in a clean state, and the load on the convection fan 5 is reduced.
For this reason, the amount of electricity supplied to the fan motor 16 for controlling the convection fan 5 to the target rotation speed is smaller than when the air filter 12 is clean. For example, referring to FIG.
When the air filter 12 is clogged to such an extent that it needs to be cleaned, the detected energization amount to the fan motor 16 when the rotation speed of the convection fan 5 is controlled to the target rotation speed Nx is, for example, The value Ixc is equal to or less than the energization amount Ic on the clogging determination line c at the target rotation speed Nx.
Note that the detected energization amount Ixc decreases as the clogging of the air filter 12 progresses.

When the clogging of the air filter 12 has progressed to some extent as described above, the reference current amount Ix and the detected current amount Ixc at the target rotation speed Nx at which the second comparing section 45 of the filter monitoring section 41 makes comparisons. And the value of the ratio (Ixc / Ix
) Is the ratio value (= Ic / Ic) between the reference current amount on the reference current amount line a and the current amount on the filter non-wearing determination line b.
Ix) or less, the second comparing section 45 outputs a signal indicating a clogged state requiring cleaning of the air filter 12, and this state is detected. Then, the filter monitoring unit 41 supplies electricity to the filter lamp 34 in accordance with the signal output of the second comparison unit 45 to turn it on, thereby notifying the user that the air filter 12 needs to be cleaned. In addition, the filter monitoring unit 41 controls the air filter 1
As in the case of No. 2, the operation stop signal is output to the operation control unit 35, and the operation of the warm air heater 1 is stopped.
After that, if the user cleans and reattaches the air filter 12 and turns on the operation switch 31 again, the warm air heater 1 resumes operation without any trouble. As described above, according to the warm air heater 1 of the present embodiment, the amount of electricity to the fan motor 16 of the convection fan 5 of the blower is detected, and the detected amount of electricity corresponds to the target rotation speed of the convection fan 5. By judging whether or not it is larger than the reference energization amount by a predetermined amount or more, it is possible to detect the non-attachment state of the air filter 12 with a simple configuration, and to perform an alarm or the like in accordance with the state. In this case, it is not necessary to provide a component such as a mechanical switch or the like that is likely to cause a failure or malfunction, so that it is possible to reliably detect the state where the air filter 12 is not mounted. Further, by determining whether or not the detected energization amount is smaller than the reference energization amount corresponding to the target rotation speed of the convection fan 5 by a predetermined amount or more, the reference energization amount for detecting the non-attached state of the air filter 12 is determined. The clogging state of the air filter 12 can also be detected by sharing the configuration of the section 39 and the amount of electricity detection section 40, and the like, making the hot air heater 1 a necessary configuration and excellent in usability. be able to.

Next, an embodiment of the blower according to the second aspect of the present invention will be described with reference to FIGS. 6 and 7 and FIG. FIG. 6 is a block diagram of a main part of a hot air heater provided with the blower of the present embodiment, and FIG. 7 is a diagram for explaining the operation of the main part of the hot air heater.

The hot-air heater of the present embodiment has the same system configuration as that of the embodiment of the first embodiment, but differs only in a part of the functional configuration of the control unit 9. 1 and 4 are denoted by the same reference numerals as in FIGS. 1 and 4, and description thereof is omitted.

Referring to FIG. 1 and FIG. 6, in the hot air heater of the present embodiment, the control unit 9 controls the energization of the fan motor 16 of the convection fan 5 by the fan control unit 38.
Is the gas burner 6 determined by the temperature control controller 36.
Is provided with an energization amount setting unit 46 for setting an energization amount to the fan motor 16 based on only the combustion amount of the fan motor 16. When the clean air filter 12 is mounted, the energization amount setting unit 46 controls the gas burner 6 determined by the temperature control unit 36.
The amount of current for operating the convection fan 5 at a rotation speed corresponding to the combustion amount is set in accordance with a data table or the like predetermined according to the combustion amount. Then, the fan control unit 38 energizes the fan motor 16 with the energization amount set by the energization amount setting unit 46.

The control unit 9 does not include the reference energization amount determination unit 39 and the energization amount detection unit 40 shown in FIG. 4 and the energization amount setting unit 46 sets the reference rotation speed of the convection fan 5 corresponding to the set energization amount. Is provided. The reference rotation speed determining unit 47 obtains the reference rotation speed of the convection fan 5 from the set energization amount in accordance with a predetermined data table, for example, as shown by a solid line d in FIG.
In this case, a solid line d (hereinafter, referred to as a reference rotational speed line d)
The reference rotation speed is determined as a standard rotation speed of the convection fan 5 when the fan motor 16 of the convection fan 5 is energized with the set energization amount in a state where the clean air filter 12 is mounted.

As in the first embodiment, the filter monitoring unit 41 provided in the control unit 9 for monitoring the presence or absence of the air filter 12 and the clogged state of the air filter 12 is monitored by the monitoring unit 41. To the reference rotation speed determination unit 47.
And the rotation speed sensor 18
This is performed based on the number of revolutions detected by the (number of revolutions detecting means), and includes first and second comparing units 48 and 49 for comparing the reference number of revolutions and the detected number of revolutions, respectively.

The first comparing section 48 determines whether or not the detected rotation speed is smaller than the reference rotation speed by a predetermined amount or more, and when the detected rotation speed is smaller than the reference rotation speed by a predetermined amount or more, the air filter 12 Assuming that it is not mounted, a signal indicating that fact is output. That is, referring to FIG. 7, a solid line e indicates a filter non-wearing determination line for determining whether the detected rotation speed is smaller than a reference rotation speed by a predetermined amount or more, and the determination line e is In the state where the air filter 12 is not mounted, the rotation speed of the convection fan 5 when the set energizing amount is supplied to the fan motor 16 is lower than the filter non-mounting determination line e (including the filter non-mounting determination line e). The rotation speed is determined.

The first comparing section 48 detects when the detected rotation speed of the convection fan 5 to which the fan motor 16 is energized by the set energization amount is equal to or less than the rotation speed on the filter non-attachment determination line e at the set energization amount. It is determined that the rotation speed is smaller than the reference rotation speed by a predetermined amount or more, and that the air filter 12 is not mounted. In this case, in the present embodiment, the first comparison unit 48 determines that the value of the ratio between the detected rotation speed and the reference rotation speed (detected rotation speed / reference rotation speed) is the rotation speed and the reference rotation speed in the filter non-wearing determination line e. When the ratio becomes equal to or less than a predetermined ratio value (number of rotations / reference number of rotations), a signal indicating that the air filter 12 is not mounted is output. Then, when the first comparing section 48 outputs the signal, the filter monitoring section 41 outputs the alarm buzzer 3 as in the embodiment of the first mode.
3 and sound an operation stop signal to the operation control unit 35.

The second comparing section 49 determines whether or not the detected rotation speed is higher than the reference rotation speed by a predetermined amount or more. Assuming that the clogging has progressed to such a degree that cleaning is necessary, a signal indicating that fact is output. More specifically, referring to FIG. 7, solid line f indicates a clogging determination line for determining whether the detected rotation speed is greater than a reference rotation speed by a predetermined amount or more. f indicates the clogging determination line f when the fan motor 16 of the convection fan 5 is energized at the set energization amount in the clogged state where the air filter 12 needs to be cleaned.
(Including the clogging determination line f).

When the detected rotation speed of the convection fan 5 is equal to or greater than the rotation speed on the clogging determination line f at the current setting amount of current, the second comparison unit 49 sets the detected rotation speed to a predetermined amount higher than the reference rotation speed. The air filter 12
Is to detect the clogged state of. In this case, the second
The comparison unit 49 determines that the value of the ratio between the detected rotation speed and the reference rotation speed (detected power supply amount / reference power supply amount) is the value of the predetermined ratio between the power supply amount and the reference power supply amount on the clogging determination line f (power supply amount / power supply amount). When it is equal to or more than the reference energization amount, a signal indicating the clogged state of the air filter 12 is output. When the second comparing section 49 outputs the signal, the filter monitoring section 41 turns on the filter lamp 34 and sets the operation control section 35
To the operation stop signal.

[0079]

The configuration other than the above is the same as that of the embodiment of the first embodiment.

Next, the operation of the warm air heater of this embodiment will be described.

The basic operation of the warm air heater of this embodiment is the first
In this case, during the combustion of the gas burner 6, the fan control unit 38 energizes the fan motor 16 with a set energization amount corresponding to only the combustion amount, so that the gas burner 6 is energized. An amount of air corresponding to the amount of combustion is supplied, and at the same time, hot air is blown at an amount of air corresponding to the amount of combustion, thereby controlling the temperature at room temperature.

In the operation of such a hot air heater, when the clean air filter 12 is mounted, the detected rotation speed of the convection fan 5 at the set energization amount Ix in FIG. It becomes a value near the reference rotation speed Nx on d.

On the other hand, when the air filter 12 is not mounted, the airflow of the convection fan 5 increases and the load increases, so that the detected rotation speed of the convection fan 5 at the set current Ix is clean. The rotation speed is lower than that in the case where the appropriate air filter 12 is mounted, and becomes, for example, the rotation speed Ne equal to or lower than the rotation speed Nxe on the filter non-mounting determination line e. For this reason, the first comparing section 48 of the filter monitoring section 41 outputs a signal indicating the non-attached state of the air filter 12, whereby the state is detected. Then, the filter monitoring unit 41 sounds the alarm buzzer 33 in response to the signal output of the first comparing unit 48, notifies the user that the air filter 12 is not mounted, and outputs a driving stop signal. Output to the operation control unit 35 to stop the operation of the warm air heater.

If the air filter 12 is clogged to such an extent that it needs to be cleaned, the air flow of the convection fan 5 is reduced and its load is reduced. Is increased as compared with the case where the clean air filter 12 is mounted,
For example, the rotation speed Nf is equal to or higher than the rotation speed Nxf on the filter clogging determination line f. For this reason, the second comparing unit 49
A signal indicating the clogged state of the air filter 12 is output,
As a result, the state is detected. Then, the filter monitoring unit 41 turns on the filter lamp 34 in accordance with the signal output of the second comparing unit 49 to notify the user that the air filter 12 needs to be cleaned, and also outputs a stop signal. Is output to the operation control unit 35 to stop the operation of the warm air heater.

As described above, according to the hot air heater of the present embodiment, similarly to the embodiment of the first embodiment, the number of rotations can be reduced without providing components which are liable to cause a failure or malfunction of a mechanical switch or the like. With a simple configuration using the sensor 18 and the like, the non-attachment state of the air filter 12 can be reliably detected, and an alarm or the like corresponding thereto can be appropriately performed. And
The configuration of the reference rotation speed determination unit 47 and the rotation speed sensor 18 for detecting the unmounted state of the air filter 12 and the like can also be used to detect the clogged state of the air filter 12. Is excellent in usability with a necessary configuration.

Next, an embodiment of the third aspect of the present invention will be described with reference to FIGS. FIG. 8 is a system configuration diagram of a hot air heater equipped with the blower of the present embodiment, FIG. 9 is a block configuration diagram of a main part of the hot air heater, and FIG. 10 explains the operation of the hot air heater. FIG.

The basic configuration of the hot air heater of the present embodiment is the same as that of the embodiment of the first embodiment, and the same components are denoted by the same reference numerals and description thereof is omitted. I do.

Referring to FIG. 8, hot air heater 1 of the present embodiment
In addition to the system configuration of the embodiment of the first embodiment shown in FIG. 1, the flow rate of air flowing through the duct 4 is detected near the air intake port 10 of the duct 4 by the operation of the convection fan 5, for example. An air flow sensor 50 (air flow detecting means) is provided. The air volume sensor 50 is a thermal air volume sensor using a heat-sensitive resistance element such as platinum as a detection element, and outputs a signal corresponding to the air volume of the air flowing through the duct 4 to the control unit 9. Other system configurations are the same as those of the embodiment of the first aspect.

Referring to FIG. 9, in the hot air heater of the present embodiment, control unit 9 controls the target rotation of fan control unit 38 having the same configuration as that of the first embodiment. A reference air flow rate determining unit 51 is provided for determining a reference air flow rate in the duct 4 corresponding to a target rotation speed of the convection fan 5 set by the number setting unit 42 in accordance with a combustion amount of the gas burner 6. The reference air volume determination unit 51 obtains a reference air volume in the duct 4 from the set target rotation speed in accordance with a predetermined data table, for example, as shown by a solid line g in FIG. In this case, the reference airflow indicated by the solid line g (hereinafter referred to as the reference airflow line g) is a standard airflow in the duct 4 when the convection fan 5 is controlled to the target rotation speed in a state where the clean air filter 12 is mounted. It is determined as the air volume.

The filter monitor 41 provided in the control unit 9 for monitoring the presence or absence of the air filter 12 and the clogged state of the air filter 12 as in the first embodiment. , Based on the reference air volume determined by the reference air volume determination unit 51 and the air volume detected by the air volume sensor 50, and includes first and second comparison units 52 and 53 for comparing the reference air volume and the detected air volume, respectively. I have.

The first comparing section 52 determines whether or not the detected air volume is larger than the reference air volume by a predetermined amount or more.
Is in the unmounted state, and a signal indicating that fact is output. That is, with reference to FIG. 10, a solid line h indicates a filter non-wearing determination line for determining whether or not the detected air volume is greater than a reference air volume by a predetermined amount or more. When the convection fan 5 is controlled to the target rotation speed in a state where the filter 12 is not mounted, the detected air volume is determined to be the air volume below the filter non-installation determination line h (including the filter non-installation determination line h). It was done.

Then, as in the case of the first embodiment, the first comparing section 52 calculates the value of the ratio of the detected airflow and the reference airflow when the convection fan 5 is controlled to the target rotation speed (detected airflow / reference airflow). ) Is greater than or equal to a predetermined ratio value (rotation speed / reference rotation speed) between the air volume and the reference air volume in the filter non-wearing determination line h, it is determined that the detected air volume is larger than the reference air volume by a predetermined volume or more. The non-attachment state of the filter 12 is detected, and a signal indicating the detection is output. Then, when the first comparing unit 52 outputs the above signal, the filter monitoring unit 41 sounds the alarm buzzer 33 as in the embodiment of the first embodiment, and also sends an operation stop signal to the operation control unit 35. Give.

The second comparing section 53 determines whether the detected air volume is smaller than the reference air volume by a predetermined amount or more.
It is determined that the clogging has progressed to such an extent that cleaning is required, and a signal indicating that fact is output. That is, with reference to FIG. 10, a solid line i indicates a clogging determination line for determining whether the detected air volume is smaller than a reference air volume by a predetermined amount or more, and the determination line i is an air filter. In the clogged state requiring cleaning at 12, the detected airflow when the convection fan 5 is controlled to the target motor speed is set to be the airflow below the clogging determination line i (including the clogging determination line i). It is determined.

As in the case of the first embodiment, the second comparing section 53 sets the value of the ratio between the detected airflow and the reference airflow at the target rotation speed at that time (detected airflow / reference airflow) to the clogging determination line. When the air flow rate becomes equal to or less than a predetermined ratio (air volume / reference air volume) between the air volume and the reference air volume at i, the air filter 1 determines that the detected air volume is smaller than the reference air volume by a predetermined volume or more.
2 is to detect a clogged state and output a signal to that effect. Then, when the second comparing section 53 outputs the signal, the filter monitoring section 41 sets the filter lamp 3
4 is turned on, and an operation stop signal is given to the operation control unit 35.

[0096]

The other structure is the same as that of the embodiment of the first embodiment.

Next, the operation of the warm air heater of this embodiment will be described.

The basic operation of the warm air heater of this embodiment is the first operation.
During combustion of the gas burner 6, the fan control unit 38 controls the convection fan 5 to a target rotation speed according to the combustion amount, so that the gas burner 6 matches the combustion amount. Of air is supplied, and at the same time, hot air is blown at a blowing amount corresponding to the combustion amount, and the temperature is controlled at room temperature.

In the operation of such a warm air heater, when the clean air filter 12 is mounted, the detected air volume of the air volume sensor 50 in the duct 4 at the target rotation speed Nx in FIG. It is a value near the reference air volume Fx on the air volume line g.

On the other hand, when the air filter 12 is not mounted, the air flow of the convection fan 5 increases, so that the detected air flow in the duct 4 at the target rotation speed Nx is such that the clean air filter 12 is mounted. Increase compared to when
Air volume F over air volume Fxh on filter non-attachment determination line h
h. For this reason, the first comparing unit 52 of the filter monitoring unit 41 outputs a signal indicating the non-attached state of the air filter 12, whereby the state is detected. And
The filter monitoring unit 41 sounds the alarm buzzer 33 in response to the signal output of the first comparing unit 52, notifies the user that the air filter 12 is not mounted, and controls the operation stop signal. Output to the unit 35 to stop the operation of the warm air heater.

If the air filter 12 is clogged to such an extent that it needs to be cleaned, the air flow of the convection fan 5 is reduced, so that the duct 4 at the target rotation speed Nx is not used.
The detected air volume inside the air filter is lower than that when the clean air filter 12 is mounted, and becomes an air volume Fi equal to or less than the air volume Fxi on the filter clogging determination line i. Therefore, the second
The comparing section 53 outputs a signal indicating the clogged state of the air filter 12, and the state is detected.
Then, the filter monitoring unit 41 turns on the filter lamp 34 according to the signal output of the second comparison unit 53, and notifies the user that the air filter 12 needs to be cleaned,
In addition, an operation stop signal is output to the operation control unit 35 to stop the operation of the warm air heater.

As described above, according to the hot air heater of the present embodiment, similarly to the embodiment of the first embodiment, the air flow sensor can be provided without providing components which are liable to cause failure or malfunction of mechanical switches or the like. It is possible to reliably detect the non-attachment state of the air filter 12 with a simple configuration using 50 or the like, and to appropriately perform an alarm or the like corresponding thereto. The clogged state of the air filter 12 can also be detected by sharing the configuration of the reference air flow rate determining unit 51 and the air flow rate sensor 50 for detecting the unmounted state of the air filter 12, and the like.
It is possible to make the hot air heater excellent in usability with a necessary configuration.

[0104]

[0105]

[0106]

[0107]

[0108]

[0109]

[0110]

[0111]

[0112]

[0113]

[0114]

[0115]

[0116]

[0117]

[0118]

In each of the embodiments described above, an alarm is given by the alarm buzzer 33 when the air filter 12 is not mounted, and an alarm is given by the filter lamp 34 when the air filter 12 is clogged. However, both alarms may be performed by using a single buzzer or lamp. In this case, the alarming method is performed when the air filter 12 is not mounted and when the air filter 12 is clogged. It may be different from each other depending on the case.

In each of the above embodiments, when the clogged state of the air filter 12 is detected, the operation of the hot air heater is stopped. However, the clogged state is detected stepwise. For example, in a moderately clogged state, only an alarm may be issued, and when a severely clogged state occurs, the operation of the warm air heater may be stopped.

Further, in each of the above embodiments, the combustion air is supplied to the gas burner 6 by the convection fan 5, but the combustion air may be supplied by another fan. In this case, any of the fans may be used to detect the presence or absence of the air filter and the presence or absence of clogging, or the detection may be performed by using both fans together.

In each of the above embodiments, the air inlet 10
Although the case where the common air filter 12 is attached to the suction port 23 and the suction port 23 is shown, the air filters may be attached independently. In this case, it is necessary to set the determination line according to the amount of change in the current value or the like when the air filter with a small passing resistance is removed so that detection can be performed regardless of which air filter is removed.

In each of the above embodiments, a gas-type warm air heater has been described as an example. However, an oil-type warm air heater may be used, or a blower used in a water heater, a clothes dryer, or the like. Needless to say, the present invention can be applied. Further, in the inventions of the first to sixth aspects, the apparatus may not include the heating means.

[0124]

[Effect of the Invention] As apparent from the above description, according to the aspect of the present invention, and current detecting means, rotational speed detecting means, the power supply amount and the rotational speed of the blower fan with the air volume detection hand stage, detecting the air blowing amount, and the detected value, the reference current amount and the reference rotation speed determined in advance corresponding to the target speed and the set power amount of the blower fan, the value of the ratio of the reference air volume above a predetermined value
Whether the air filter is not attached to the air passage is detected by judging whether the air filter is present or not more than a predetermined value, so that the detection is reliably performed with an extremely simple configuration that is unlikely to cause a failure or the like. Therefore, it is possible to improve the reliability of detecting the non-attached state of the air filter. In addition, since the detection can be performed with a very simple configuration, the cost can be reduced.

[0125] Further, by determining the magnitude of the detected value against the reference power supply amount and the reference rotation speed, the reference air amount,
By detecting also the clogged state of the air filter when the air filter is mounted in the air passage, the detection of both the unmounted state and the clogged state of the air filter can be detected by a common detecting means. And a blower with excellent usability can be provided at low cost.

[0126]

Further, as described above, the detection of the non-attached state of the air filter and the detection of the clogged state can be reliably performed with high reliability. It is possible to accurately notify the user of the fact that the air filter should be attached and the necessity of cleaning the air filter, and it is possible to enhance the usability of the blower.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a hot air heater to which an example of a first embodiment of the present invention is applied.

FIG. 2 is a perspective view of the warm air heater of FIG. 1 as viewed from the front side.

FIG. 3 is a perspective view of the warm air heater of FIG. 1 as viewed from the rear side.

FIG. 4 is a block configuration diagram of a main part of the hot air heater of FIG. 1;

FIG. 5 is a diagram for explaining the operation of the main part of the warm air heater of FIG. 1;

FIG. 6 is a block diagram of a main part of a hot air heater to which an example of the second aspect of the present invention is applied.

FIG. 7 is a diagram for explaining the operation of the main part of the warm air heater of FIG. 6;

FIG. 8 is a system configuration diagram of a hot air heater to which an example of a third embodiment of the present invention is applied.

FIG. 9 is a block diagram of a main part of the warm air heater of FIG. 8;

FIG. 10 is a diagram for explaining the operation of the main part of the warm air heater of FIG. 8;

[Explanation of symbols]

4 ... duct (air passage), 5 ... convection fan (blower fan), 6 ... gas burner (heating means), 18 ... rotational speed sensor, 3 3 ... alarm buzzer (notifying means), 34 ... filter lamp (notification means), 38 ... fan control unit, 40 ... current amount detecting unit, 41 ... filter monitoring unit (filter mounting state detecting means), 50 ... air flow sensor.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-358511 (JP, A) JP-A-61-175428 (JP, A) JP-A-5-223346 (JP, A) JP-A-63-175 36840 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24H 3/04 305 F04D 25/08 F24F 1/00 371

Claims (8)

(57) [Claims] 1. An air passage having an air filter removably provided therein, a blower fan for generating an air flow in the air passage, a rotation speed detection means for detecting a rotation speed of the blower fan, and a rotation speed detection means. Fan control means for controlling the energization of the blower fan so that the detected rotation speed matches the target rotation speed, the blower fan when the detected rotation speed matches the target rotation speed. Means for detecting the amount of power supplied to the motor, and a value of a ratio of the amount of power detected by the means for detecting the amount of power supplied to the target power and a reference amount of power predetermined for the target rotational speed (detected amount of power / reference amount of power supply). )But
A blower, comprising: a filter mounted state detecting means for determining that the air filter is not mounted when a predetermined value or more is obtained . 2. The filter mounted state detecting means determines that the air filter is in a clogged state when the amount of current detected by the amount of power detection means is smaller than the reference amount of power by a predetermined amount or more. The blower according to claim 1, wherein: 3. An air passage provided with an air filter in a detachable manner, a blower fan for generating an air flow in the air passage, and an amount of power to the blower fan set. A fan detecting means for detecting the number of rotations of the blower fan, and a rotation detected by the rotation number detecting means when the fan control means supplies power to the blower fan. number
And a value of a ratio of a predetermined rotation speed of the blower fan corresponding to the set energization amount (detected rotation speed / reference speed).
A filter mounted state detecting means for determining that the air filter is not mounted when the number of rotations becomes equal to or less than a predetermined value . 4. The air filter clogging device according to claim 1, wherein said filter mounting condition detecting means is configured to: clog said air filter when said detected rotation speed becomes larger than said reference rotation speed by a predetermined amount or more when said fan control means supplies power to said blower fan. The blower according to claim 3, wherein the blower is determined to be in a state. 5. An air passage having a detachable air filter, a blower fan for generating an air flow in the air passage, rotation speed detecting means for detecting the rotation speed of the blower fan, and the rotation speed detecting device. A fan control unit for controlling the energization of the blower fan such that the rotation speed detected by the fan matches the target rotation speed, wherein the airflow detection unit detects the airflow of the ventilation path by the blower fan; the value of the ratio of the reference air quantity predetermined to correspond to the target rotational speed and the detected air amount by the air volume detecting means (detecting air volume / reference air
The air blower, further comprising: a filter mounted state detecting means for determining that the air filter is not mounted when the amount is equal to or more than a predetermined value . 6. The air conditioner according to claim 1, wherein the filter mounted state detecting means determines that the air filter is in a clogged state when the air flow detected by the air flow detecting means is smaller than the reference air flow by a predetermined amount or more. The blower according to claim 5, wherein 7. When the air filter is determined to be in a clogged state by the filter mounted state detecting means,
請 characterized by comprising an informing means for informing to that effect
The blower according to any one of claims 2, 4, and 6 . 8. When the air filter by the filter mounting state detection means is determined to be non-mounted state, claims and further comprising a notification means for notifying to that effect
Item 8. The blower according to any one of Items 1 to 7 .