JP2010242627A - Blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blower notifying a timing appropriate for cleaning to be cleaned, thereby suppressing increase of power consumption of a motor and preventing degradation of ventilation performance. <P>SOLUTION: In a centrifugal blower 1 including a scroll-shaped casing 6 having an intake port 5 and a centrifugal impeller 9 for blowing air into the casing 6 by rotating about a rotary shaft 13, the blower 1 further includes a dirt detection means for detecting a dirt adhering to the centrifugal impeller 9, a dirt determination means for determining the degree of dirt based on the detected value by the dirt detection means, and a notifying means for notifying a timing for cleaning based on the determination result of the dirt determination means. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an air blower used for a ventilation air conditioner or the like.

  Conventionally, this type of blower is known to be a ceiling-embedded ventilation fan in which a main body is installed on a ceiling or the like, and communicates with the outdoors via a duct to discharge indoor contaminated air to the outdoors (for example, Patent Document 1). reference).

Hereinafter, the blower will be described with reference to FIG. As shown in the figure, a box-shaped frame 104 having a suction port 102 covered with a grill 101 on the lower surface and provided with a blow-out port 103 on a side surface, an adapter 106 connecting a duct 105 communicating with the outdoors, and a frame 104 In the inside, there are provided a scroll-shaped casing 108 having an orifice 107 as a suction port on the lower surface, a centrifugal blower blade 109 for blowing air into the casing 108, and an electric motor 110 for rotationally driving the centrifugal blower blade 109. Yes.
JP 2003-065581 A

  In such a conventional blower, dirt gradually adheres to the impeller inside the blower, and it is difficult to know the appropriate cleaning time, so that dirt accumulates between the blades of the impeller. As a result, there is a problem that it becomes difficult for the wind to pass through, the ventilation capacity of the blower device cannot be reduced, and the load on the motor increases, so that the power consumption of the motor increases.

  The present invention solves such a conventional problem, and it is possible to suppress an increase in power consumption of the motor by notifying the appropriate cleaning timing and cleaning, and to reduce the ventilation capacity of the blower. It aims at providing the air blower effective in preventing.

  In order to achieve the above object, the blower of the present invention has a scroll-shaped casing having a suction port, an impeller having a blade and a main plate for blowing air in the casing, and an electric motor that rotationally drives the impeller. In the air blower equipped with the present invention, the dirt detecting means for detecting dirt attached to the impeller, the dirt determining means for judging the degree of dirt based on the detection value of the dirt detecting means, and the judgment result of the dirt judging means The air blower is characterized by comprising notifying means for notifying the cleaning time based on the air blowing means.

  By detecting dirt attached to the impeller, notifying the appropriate cleaning time and performing cleaning, an increase in power consumption of the motor can be suppressed and a decrease in ventilation capacity of the blower can be prevented. Is obtained.

  In another aspect, the dirt detecting means includes a light emitting means for irradiating light toward the impeller, and a light receiving means for receiving the light emitted from the light emitting means. .

  By this means, when the light emitted from the light emitting means enters the light receiving means through the impeller, the degree of dirt is detected by detecting the degree of dirt based on the amount of light received depending on the degree of dirt of the impeller. A blower capable of easily configuring the detection means is obtained.

  The other means is that the dirt detecting means has a reflecting means for reflecting the light emitted from the light emitting means, and the dirt determining means is reflected by the reflecting means and based on the amount of light received by the light receiving means. The blower is characterized by determining the degree of contamination of the impeller.

  By this means, by detecting the amount of reflection of the light emitted from the light emitting means toward the impeller by the light receiving means, a blower that can easily determine the degree of contamination of the impeller can be obtained.

  The other means is a blower characterized in that the reflecting means is provided on the positive pressure side of the blade of the impeller.

  By this means, a lot of dirt adheres to the positive pressure side of the blade of the impeller. By providing the reflecting means on the positive pressure side of the blade, it is possible to directly detect the degree of dirt of the impeller most easily attached. A blower that can perform the above is obtained.

  Another means is a blower characterized in that the reflecting means is provided on the main plate between the blades of the impeller.

  By this means, unlike the case where the reflecting means is provided on the blade positive pressure side, the reflected light can be directly received by the light receiving means, so that a blower capable of accurately detecting the degree of contamination can be obtained.

  According to another aspect of the present invention, the dirt determination means determines the degree of dirt on the impeller based on the difference between the amount of light emitted from the light emitting means and the amount of light of the light receiving means; It is a thing.

  By this means, the amount of reflected light varies depending on the degree of dirt on the impeller surface, so the degree of dirt is accurately detected by determining the degree of dirt based on the difference from the amount of light emitted from the light emitting means. A blower that can be obtained is obtained.

  Another means is a blower characterized in that the dirt determination means determines the degree of dirt on the impeller based on a change over time in the amount of light received by the light receiving means.

  By this means, the amount of reflected light varies depending on the degree of dirt on the surface of the impeller. Therefore, the degree of dirt is determined by determining the degree of dirt based on the fact that the amount of reflected light decreases as the amount of dirt attached increases with time. A blower capable of accurately detecting the degree is obtained.

  According to another aspect of the invention, the dirt determination means determines the degree of dirt on the impeller based on the amount of light emitted from the light emitting means and transmitted through the impeller and received by the light receiving means. It is a thing.

  By this means, the air blower capable of easily determining the degree of contamination of the impeller is obtained by detecting the amount of transmission of the light emitted from the light emitting means toward the impeller by the light receiving means.

  The other means is a blower characterized in that the light emitting means is disposed in the blade inner peripheral space of the impeller and the light receiving means is disposed in the blade outer peripheral space of the impeller.

  By this means, since the light emitting means can illuminate substantially the entire circumference in the casing, it is possible to obtain a blower device that can reduce the restriction of the arrangement of the light receiving means in the blade outer peripheral side space.

  Another means is a blower characterized in that the light emitting means is disposed in the blade outer peripheral space of the impeller and the light receiving means is disposed in the blade inner peripheral space of the impeller.

  By this means, a part of the electrical part of the light receiving means can be shared with the electric motor to obtain a blower device that can realize space saving of the light receiving means.

  Another means is a blower characterized in that the light emitting means is disposed in the blade outer peripheral space of the impeller, and the light receiving means is disposed so as to face the light emitting means via the impeller. It is.

  By this means, for example, since transmitted light enters the light receiving means without passing through the main plate of the impeller, the shape of the main plate is not limited, and the decrease in the amount of transmitted light is small, so the degree of contamination can be detected accurately. A blower that can be obtained is obtained.

  Further, the other means is that the dirt determination means is based on the difference between the amount of light emitted from the light emitting means and the amount of transmitted light resulting from transmission of the light emitted from the light emitting means through the impeller. It is set as the air blower characterized by determining the degree of dirt.

  By this means, the amount of transmitted light varies depending on the degree of dirt attached to the blade of the impeller, so the degree of dirt is determined based on the difference between the amount of light emitted from the light emitting means and the amount of transmitted light. A blower capable of accurately detecting the degree of contamination can be obtained.

  Further, the other means is characterized in that the dirt detecting means determines the degree of dirt of the impeller based on a change over time of the amount of transmitted light which is irradiated from the light emitting means and transmitted through the impeller and received by the light receiving means. This is a blower.

  By this means, the amount of transmitted light changes depending on the degree of dirt attached to the blades of the impeller, and therefore the degree of dirt is determined based on the fact that the amount of transmitted light also decreases as the amount of dirt attached increases with time. Thus, a blower capable of accurately detecting dirt is obtained.

  Another means is a blower characterized in that the light emitting means is constituted by a light emitting diode.

  By this means, by using a light emitting diode as the light emitting means, a blower capable of extending the life of the light emitting means can be obtained.

  According to another aspect of the invention, the dirt detection means includes an integration means for integrating the operating time of the blower, and the dirt determination means determines the degree of dirt on the impeller based on the integrated value of the integration means. It is set as the air blower which performs.

  By this means, a blower that can easily determine the degree of dirt on the impeller from the relationship between the accumulated operation time of the blower and the degree of dirt on the impeller is obtained.

  The other means is that the dirt detecting means comprises air volume measuring means for measuring the air flow rate of the blower, and the dirt determining means determines the degree of dirt on the impeller based on the measurement value of the air volume measuring means. The air blowing device is characterized.

  By this means, it is possible to obtain a blower that can easily determine the degree of dirt on the impeller from the relationship between the decrease in the air volume due to dirt adhering to the impeller surface and the degree of dirt.

  According to the present invention, it is possible to suppress an increase in power consumption of an electric motor by notifying an appropriate cleaning time and cleaning, and to provide a blower device that is effective in preventing a decrease in ventilation capacity of the blower device. it can.

  The invention according to claim 1 of the present invention includes a scroll-shaped casing having a suction port, an impeller having a blade and a main plate for blowing air in the casing, and an electric motor for rotationally driving the impeller. In the blower, the dirt detecting means for detecting the dirt attached to the impeller, the dirt determining means for judging the degree of dirt based on the detection value of the dirt detecting means, and the cleaning based on the judgment result of the dirt judging means The air blower is characterized in that it is provided with an informing means for informing the time of, and by detecting the degree of dirt attached to the impeller, informing the appropriate cleaning time and cleaning, An increase in power consumption of the electric motor can be suppressed, and a reduction in ventilation capacity of the blower can be prevented.

  Further, the dirt detecting means is a blower device characterized by having a light emitting means for irradiating light toward the impeller and a light receiving means for receiving the light emitted from the light emitting means. When the irradiated light enters the light receiving means via the impeller, the dirt detecting means is easily configured by detecting the degree of dirt based on the change in the amount of light received according to the degree of dirt on the impeller. It has the effect of being able to.

  Further, the dirt detecting means has a reflecting means for reflecting the light emitted from the light emitting means, and the dirt determining means is reflected by the reflecting means and based on the amount of light received by the light receiving means, the impeller The air blower is characterized by determining the degree of dirt, and the degree of dirt on the impeller is easily determined by detecting the amount of reflection of light emitted from the light emitting means toward the impeller by the light receiving means. It has the effect of being able to.

  Further, the air blowing device is characterized in that the reflecting means is provided on the positive pressure side of the blade of the impeller, and a large amount of dirt adheres to the positive pressure side of the blade of the impeller. By providing on the pressure side, there is an effect that the degree of contamination of the impeller where the most contamination is most likely to be directly detected.

  Further, it is a blower characterized in that the reflecting means is provided on the main plate between the blades of the impeller, and unlike the case where the reflecting means is provided on the blade positive pressure side, the reflected light is directly received by the light receiving means. Therefore, the degree of contamination can be detected with high accuracy.

  Further, the dirt determination means is a blower characterized in that the degree of dirt on the impeller is determined based on the difference between the amount of light emitted from the light emitting means and the amount of light of the light receiving means. Since the amount of reflected light varies depending on the degree of dirt on the impeller surface, the degree of dirt can be accurately detected by determining the degree of dirt based on the difference from the amount of light emitted from the light emitting means. It has the action.

  Further, the dirt determination means is a blower characterized in that the degree of dirt on the impeller is determined based on a change over time in the amount of light received by the light receiving means, and the amount of reflected light is determined by the impeller. Since it changes depending on the degree of dirt on the surface, the degree of dirt can be accurately detected by determining the degree of dirt based on the fact that the amount of reflected light decreases as the amount of dirt attached increases over time. Have

  The dirt determination means is a blower characterized in that the degree of dirt of the impeller is determined based on the amount of light irradiated from the light emitting means, transmitted through the impeller, and received by the light receiving means. By detecting the transmission amount of the light emitted from the light emitting means toward the impeller by the light receiving means, it is possible to easily determine the degree of contamination of the impeller.

  Further, the light emitting means is arranged in the blade inner peripheral space of the impeller, and the light receiving means is arranged in the blade outer peripheral space of the impeller, and the light emitting means is provided in the casing. Therefore, it is possible to reduce the restriction on the arrangement of the light receiving means in the blade outer peripheral side space.

  Further, the light emitting means is disposed in the outer peripheral space of the blade of the impeller, and the light receiving means is disposed in the inner peripheral space of the blade of the impeller. A part of the motor is shared with the electric motor, so that the space saving of the light receiving means can be realized.

  Further, the light emitting means is disposed in the blade outer peripheral side space of the impeller, and the light receiving means is disposed so as to face the light emitting means via the impeller. Since the transmitted light enters the light receiving means without passing through the main plate of the impeller, the shape of the main plate is not limited, and the decrease in the amount of transmitted light is small, so that the degree of contamination can be accurately detected. .

  Further, the dirt determination means determines the degree of dirt on the impeller based on the difference between the amount of light emitted from the light emitting means and the amount of light transmitted by the light emitted from the light emitting means transmitted through the impeller. Since the amount of transmitted light varies depending on the degree of dirt attached to the blade of the impeller, the amount of light emitted from the light emitting means and the amount of transmitted light By determining the degree of dirt based on the difference between the two, the degree of dirt can be detected with high accuracy.

  Further, the dirt detecting means is a blower characterized in that the degree of dirt on the impeller is determined based on a change over time in the amount of transmitted light that is irradiated from the light emitting means, passes through the impeller, and is received by the light receiving means. Since the amount of transmitted light changes depending on the degree of dirt attached to the blade of the impeller, the degree of dirt is determined based on the fact that the amount of transmitted light decreases as the amount of dirt attached increases with time. , It has an effect that the degree of contamination can be detected with high accuracy.

  Further, the light emitting means is a blower characterized by comprising a light emitting diode, and the use of the light emitting diode for the light emitting means has the effect of extending the life of the light emitting means.

  Further, the dirt detection means includes an integration means for integrating the operating time of the blower, and the dirt determination means determines the degree of dirt on the impeller based on the integrated value of the integration means; Therefore, it has an effect that the degree of impeller dirt can be easily determined from the relationship between the accumulated operation time of the blower and the degree of dirt of the impeller.

  Further, the dirt detecting means includes an air volume measuring means for measuring an air flow rate of the blower, and the dirt determining means determines the degree of dirt of the impeller based on the measurement value of the air volume measuring means. The apparatus has an effect that the degree of dirt on the impeller can be easily determined from the relationship between the decrease in the air volume due to dirt adhering to the impeller surface and the degree of dirt.

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

(Embodiment 1)
Embodiment 1 of the present invention will be described with reference to FIG. 1, FIG. 2, FIG. 3, FIG.

  As shown in FIG. 1, for example, a centrifugal blower 1 used as a ceiling-embedded ventilation fan attached to a ceiling to ventilate a space such as a bathroom or a toilet includes a frame 4 and a centrifugal blade provided inside the frame 4. A scroll casing 6 provided with a bell mouth-like suction port 5 around the rotary shaft 13 of the centrifugal impeller 9, an adapter 2 communicating with the opening of the side surface 3 of the frame 4, and a control device 8 is provided.

  As shown in FIGS. 2 and 3, the frame 4 is composed of a lower surface 7 and a side surface 3 that is partially open, and the electric motor 10 is fixed to a flat top plate 11 fixed to the frame 4. The centrifugal impeller 9 is rotatably fixed to the electric motor 10 and has a configuration in which, for example, a reflective tape 14 is provided as a reflective member on the main plate 19 and the blade positive pressure side surface 18 of the blade 17.

  Further, as shown in FIG. 2, the light irradiated from the light emitting means 15 is reflected by the reflecting tape 14, and the light reflected by the light receiving means 16 while being reflected by the centrifugal impeller 9 or the like enters.

  FIG. 4 is a block diagram showing the configuration of the control device 8. As shown in FIG. 4, the control device 8 includes a light emitting means 15 (for example, a light emitting diode), a light receiving means 16 (for example, a light receiving sensor), A notification means 20 (for example, a buzzer), a dirt determination means 30, a light emitting means 15, a light receiving means 16, a notification means 20, and a microcomputer 21 for controlling the dirt determination means 30 are provided. Based on the light quantity of the reflected light received by the means 16, the dirt judgment means 30 determines the dirt from the difference with the light quantity emitted from the light emitting means 15, and the notification means 20 notifies the cleaning.

  With the above configuration, by applying a driving force from the electric motor 10 and rotating the centrifugal impeller 9, the intake air is guided to the centrifugal impeller 9 through the opening of the lower surface 7 of the frame 4 and the intake port 5 of the casing 6. The pressure is increased, and the dynamic pressure is gradually converted into a static pressure when passing through the casing 6, and is discharged from the discharge port 12 to the outside through the adapter 2.

  At this time, as the operation time elapses, dirt contained in the air adheres to the centrifugal impeller 9 and dirt also adheres to the reflective tape 14. As dirt adheres and accumulates, the amount of light reflected from the reflective tape 14 gradually decreases, and the value of the difference from the amount of light emitted from the light emitting means 15 increases.

  The dirt determination means 30 stores a set value for determining that cleaning is necessary. For example, the light received from the light receiving means 15 due to the accumulation of dirt when the amount of light emitted from the light emitting means 15 is 50 mcd. When the amount of light becomes 30 mcd, the dirt determination unit 30 compares the measured value of the light amount difference 20 mcd with the stored setting value to determine whether cleaning is necessary.

  If the measured light quantity difference 20 mcd is larger than the stored setting value (for example, 15 mcd) and it is determined that cleaning is necessary, the notification means 20 controlled by the microcomputer 21 is activated to indicate that dirt has accumulated. By performing notification and cleaning, an increase in power consumption of the electric motor 10 can be suppressed, and a decrease in ventilation capacity of the centrifugal blower 1 can be prevented.

  As described above, the degree of contamination of the centrifugal impeller 9 can be easily determined by detecting the reflection amount of the light emitted from the light emitting means 15 toward the centrifugal impeller 9 by the light receiving means 16.

  Further, as shown in FIG. 3, since the centrifugal impeller 9 rotates in the illustrated rotational direction, a large amount of dirt adheres to the blade pressure side 18, so that the reflection tape 14 is provided on the pressure side of the blade so that the reflection tape 14, the dirt easily adheres, the difference in the amount of reflected light due to the dirt increases, and the degree of dirt of the centrifugal impeller 9 can be easily detected. Further, since the light emitting means 15 is composed of a light emitting diode, the life of the light emitting means 15 can be extended.

  Further, the light emission time of the light emitting means 15 may be emitted together with the driving of the electric motor 10, but from the viewpoint of energy saving, in the case of continuous operation for 24 hours, for example, the time during which the light amount is stabilized once a week ( Several minutes), and in the case of intermittent operation, it may be several minutes at the start of operation.

  In the first embodiment of the present invention, the reflective tape 14 is provided on the blade pressure side 18, but when the reflective tape 14 is provided on the main plate 19 between the blades 17 as shown in FIGS. 5 and 6. Unlike the case where the reflecting means is provided on the blade positive pressure side, the reflected light can be directly received by the light receiving means, so that the degree of contamination can be detected more accurately.

  In the first embodiment of the present invention, the amount of reflected light varies depending on the degree of contamination of the centrifugal impeller 9, so the degree of contamination is determined based on the difference from the amount of light emitted from the light emitting means 15. If the dirt of the centrifugal impeller 9 is determined based on the temporal change in the amount of reflected light by causing the light emitting means 15 to emit light continuously, the dirt can be detected with higher accuracy.

  In the present embodiment, the light emitting means 15 is allowed to emit light when the electric motor 10 is stopped, so that it can also be used as auxiliary illumination when performing inspection and cleaning from below.

(Embodiment 2)
The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The second embodiment of the present invention has a configuration in which the control device 22 is arranged in the inner circumferential space of the casing 6 as shown in FIG.

  The light emitting means 15 is provided by adjusting the irradiation direction so as to irradiate the light receiving means 16, and the light receiving means 16 is configured to detect the amount of light emitted from the light emitting means 15. .

  Further, the microcomputer 21 determines the dirt by the dirt determination means 30 from the difference from the light quantity of the light emitted from the light emitting means 15 based on the light quantity of the transmitted light received by the light receiving means 16, and cleans it by the notification means 20. It is configured to inform.

  With the above configuration, when dirt is accumulated on the centrifugal impeller 9, the amount of light emitted from the light emitting means 15 gradually decreases through the centrifugal impeller 9, and the amount of light emitted from the light emitting means 15 The difference becomes larger.

  A setting value for determining that cleaning is necessary is stored in the dirt determination means 30. For example, light having a light intensity of 50 mcd emitted from the light emitting means 15 is received by the light receiving means for accumulation of dirt. When the amount of light becomes 30 mcd, the dirt determination unit 30 compares the measured value of the light amount difference 20 mcd with the stored setting value to determine whether cleaning is necessary.

  When the measured light quantity difference of 20 mcd is larger than the stored setting value (for example, 15 mcd) and it is determined that cleaning is necessary, the notification means controlled by the microcomputer 21 is activated to notify that dirt has accumulated. Thus, by cleaning, an increase in power consumption of the electric motor 10 can be suppressed, and a decrease in the ventilation capacity of the centrifugal blower 1 can be prevented.

  As described above, the degree of contamination of the centrifugal impeller 9 can be easily determined by detecting the amount of light transmitted by the light emitting means 15 toward the centrifugal impeller 9 by the light receiving means 16.

  Moreover, since the light emission means 15 can illuminate substantially the entire circumference in the casing 6, the restriction | limiting of arrangement | positioning in the braid | blade 17 outer peripheral side space of the light-receiving means 16 can be lessened.

  Further, the light emitting means 15 includes a light emitting diode, so that the life of the light emitting means 15 can be extended.

  Further, the light emission time of the light emitting means 15 may be emitted together with the driving of the electric motor 10, but from the viewpoint of energy saving, in the case of continuous operation for 24 hours, for example, the time during which the light amount is stabilized once a week ( Several minutes), and in the case of intermittent operation, it may be several minutes at the start of operation.

  In the second embodiment of the present invention, the light emitting means 15 is disposed in the electric motor 10 in the inner circumferential space of the blade 17 and the control device 22 is disposed in the inner circumferential space of the casing 6. As described above, when the light emitting means 15 is disposed in the outer peripheral space of the casing 6 and the control device 22 is disposed in the electric motor 10 in the inner peripheral space of the blade 17, a part of the control device 22 is shared with the electric motor 10. This can save space for the control device.

  In the second embodiment of the present invention, the light emitting means 15 is disposed in the electric motor 10 in the inner circumferential space of the blade 17 and the control device 22 is disposed in the inner circumferential space of the casing 6. Thus, when the light emitting means 15 is arranged in the outer peripheral side space of the casing 6 and the control device 22 is arranged in the outer peripheral side space of the casing 6 facing the light emitting means 15 via the centrifugal impeller 9, the transmitted light is Since it is not affected by the main plate 19, the decrease in the amount of light is small, and the degree of contamination can be detected more accurately.

  In the second embodiment of the present invention, since it varies depending on the degree of dirt adhering to the blade 17 of the centrifugal impeller 9, the dirt is determined based on the difference between the amount of light emitted from the light emitting means 15 and the quantity of transmitted light. Although the degree is determined, the dirt can be detected with higher accuracy by continuously emitting the light emitting means 15 and determining the dirt of the centrifugal impeller 9 based on the temporal change of the amount of transmitted light.

  In addition, in this Embodiment, it can also be used as auxiliary | assistant illumination at the time of performing inspection cleaning from the bottom by making the light emission means 15 light-emit when the electric motor 10 stops.

(Embodiment 3)
The same parts as those in the first or second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The third embodiment of the present invention is configured to include a control device 25 as shown in FIG.

  FIG. 11 is a block diagram showing the configuration of the control device 25. As shown in FIG. 11, the control device 25 has an integrating means 23, an informing means 20, and a degree of contamination, which are configured inside a microcomputer, for example. The determination unit 26 includes a determination unit 26 for determining, an integration unit 23, a notification unit 20, and a microcomputer 24 for controlling the contamination determination unit 26. The microcomputer 24 centrifuges based on the integrated value of the operation time of the integration unit 23. The contamination degree of the impeller 9 is determined by the contamination determination means 26, and the notification means 20 notifies the cleaning.

  Further, the integrating means 23 is configured to integrate the operation time based on ON / OFF of the operation switch 31.

  With the above-described configuration, the set value for determining that cleaning is necessary is stored in the dirt determination means 26. For example, the integrated value of the operation time due to ON / OFF of the operation switch 31 is 30 hours a day when operated 12 hours a day. In the case of 360 hours, the dirt determination means 26 compares the measured accumulated time with the stored set value to determine whether cleaning is necessary. When it is determined that cleaning is required to be greater than a set value (for example, 360 hours) stored in the measured accumulated time, the notification means 20 controlled by the microcomputer 24 is activated to notify that dirt has accumulated. By cleaning, an increase in power consumption of the electric motor 10 can be suppressed, and a decrease in ventilation capacity of the centrifugal blower 1 can be prevented.

  As described above, by providing the integrating means 23, it is possible to easily determine the contamination of the centrifugal impeller 9 from the relationship between the accumulated operation time of the centrifugal blower 1 and the degree of contamination of the centrifugal impeller 9.

(Embodiment 4)
The same parts as those in the first to third embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 12, Embodiment 4 of the present invention has a configuration in which a controller 29 is provided on the inner peripheral side wall surface of the adapter 2.

  13 is a block diagram showing the configuration of the control device 29. As shown in FIG. 13, the control device 29 includes an air volume measuring means 27 (for example, an air volume measuring sensor), an informing means 20, and a dirt determining means 32. And a microcomputer 28 for controlling the air volume measuring means 27, the notifying means 20 and the dirt determining means 32. The microcomputer 28 is based on the air volume of the centrifugal blower 1 detected by the air volume measuring means 27, and the initial air volume. From the difference, the dirt determination means 32 determines the dirt, and the notification means 20 notifies the cleaning.

  The air volume measuring means 27 is configured to measure the air volume of the centrifugal blower 1.

With the above configuration, the centrifugal blower 1 continues to operate, so that dirt accumulates on the centrifugal impeller 9. A set value for determining that cleaning is necessary is stored in the dirt determination means 32. For example, when the initial air volume is 100 m ³ / h but is reduced to 60 m ³ / h due to dirt accumulation, The determination unit 32 compares the measured air volume difference of 40 m ³ / h with the stored set value to determine whether cleaning is necessary. When the measured air volume difference of 40 m ³ / h is larger than the stored set value (for example, 30 m ³ / h) and it is determined that cleaning is necessary, the notification means 20 controlled by the microcomputer 28 is activated, By notifying that dirt has accumulated and performing cleaning, an increase in power consumption of the electric motor 10 can be suppressed, and a reduction in ventilation capacity of the centrifugal blower 1 can be prevented.

  As described above, by providing the air volume measuring means 27, the contamination of the centrifugal impeller 9 can be easily determined from the relationship between the decrease in the air volume due to the contamination adhering to the centrifugal impeller 9 and the degree of contamination.

  The present invention can provide appropriate ventilation, can suppress energy loss, and provides a blower that is effective in preventing a reduction in ventilation capacity of the blower, and is particularly used for ventilation air conditioners and the like. It can be used for a blower.

The perspective view which shows the centrifugal blower of Embodiment 1 of this invention. Side sectional view which shows the centrifugal blower of Embodiment 1 of this invention. Sectional drawing perpendicular | vertical to the axial direction which shows the centrifugal impeller of the centrifugal blower of Embodiment 1 of this invention 1 is a block diagram of a control device according to a first embodiment of the present invention. Side sectional view which shows the centrifugal blower of Embodiment 1 of this invention. Sectional drawing perpendicular | vertical to the axial direction which shows the centrifugal impeller of the centrifugal blower of Embodiment 1 of this invention Side sectional view which shows the centrifugal blower of Embodiment 2 of this invention. Side sectional view which shows the centrifugal blower of Embodiment 2 of this invention. Side sectional view which shows the centrifugal blower of Embodiment 2 of this invention. Side sectional view which shows the centrifugal blower of Embodiment 3 of this invention. The block diagram of the control apparatus of Embodiment 3 of this invention Side sectional view which shows the centrifugal blower of Embodiment 4 of this invention. The block diagram of the control apparatus of Embodiment 4 of this invention Side sectional view showing a conventional centrifugal blower

DESCRIPTION OF SYMBOLS 1 Centrifugal blower 2 Adapter 3 Side surface 4 Frame 5 Suction port 6 Casing 7 Lower surface 8 Control device 9 Centrifugal impeller 10 Electric motor 11 Top plate 12 Discharge port 13 Rotating shaft 14 Reflective tape 15 Light emitting means 16 Light receiving means 17 Blade 18 Blade positive pressure side face DESCRIPTION OF SYMBOLS 19 Main board 20 Notification means 21 Microcomputer 22 Control apparatus 23 Accumulation means 24 Microcomputer 25 Control apparatus 26 Dirt determination means 27 Air volume measurement means 28 Microcomputer 29 Control apparatus 30 Dirt determination means 31 Operation switch 32 Dirt determination means

Claims (16)

Dirty adhering to the impeller in a scroll-shaped casing having a suction port, an impeller having a blade and a main plate for blowing air in the casing, and an electric motor for rotating the impeller A dirt detecting means for detecting the dirt, a dirt judging means for judging the degree of dirt based on the detection value of the dirt detecting means, and a notifying means for notifying the timing of cleaning based on the judgment result of the dirt judging means. A blower characterized by that. 2. The air blower according to claim 1, wherein the dirt detecting means includes a light emitting means for irradiating light toward the impeller and a light receiving means for receiving the light emitted from the light emitting means. The dirt detecting means has reflecting means for reflecting the light emitted from the light emitting means, and the dirt determining means is reflected by the reflecting means and the degree of dirt on the impeller based on the amount of light received by the light receiving means. The blower according to claim 2, wherein the air blower is determined. The air blower according to claim 3, wherein the reflecting means is provided on the pressure side of the blade of the impeller. 4. The air blower according to claim 3, wherein the reflecting means is provided on a main plate between blades of the impeller. 6. The dirt determination means determines the degree of dirt on the impeller based on the difference between the light quantity of light emitted from the light emitting means and the light quantity of light from the light receiving means. Blower. The blower according to any one of claims 3 to 5, wherein the dirt determination means determines the degree of dirt of the impeller based on a change with time of the amount of light received by the light receiving means. The air blower according to claim 2, wherein the dirt determination means determines the degree of dirt of the impeller based on the amount of light irradiated from the light emitting means, transmitted through the impeller, and received by the light receiving means. 9. The air blower according to claim 8, wherein the light emitting means is arranged in a blade inner peripheral space of the impeller, and the light receiving means is arranged in a blade outer peripheral space of the impeller. 9. The air blower according to claim 8, wherein the light emitting means is disposed in a blade outer peripheral space of the impeller, and the light receiving means is disposed in a blade inner peripheral space of the impeller. The air blower according to claim 8, wherein the light emitting means is disposed in a blade outer peripheral side space of the impeller, and the light receiving means is disposed so as to face the light emitting means via the impeller. The dirt determination means determines the degree of dirt on the impeller based on the difference between the amount of light emitted from the light emitting means and the amount of transmitted light resulting from transmission of the light emitted from the light emitting means through the impeller. The air blower according to any one of claims 8 to 11, wherein: The dirt detection means determines the degree of dirt on the impeller based on a change over time of the amount of transmitted light that is irradiated from the light emitting means, passes through the impeller, and is received by the light receiving means. A blower according to the above. The air blower according to any one of claims 2 to 13, wherein the light emitting means comprises a light emitting diode. 2. The dirt detection means includes an integration means for integrating the operating time of the blower, and the dirt determination means determines the degree of dirt on the impeller based on the integrated value of the integration means. Blower. 2. The dirt detecting means comprises an air volume measuring means for measuring an air flow rate of the blower, and the dirt determining means determines the degree of dirt on the impeller based on a measurement value of the air volume measuring means. The blower described in 1.

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