JP2013087715A - Air blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air blower that prevents reduction in air volume and saves power.SOLUTION: This air blower 1 includes an air passage 8, and an air-blowing fan 17 arranged in the air passage 8 and maintained in a predetermined set rotating speed by varying the duty ratio of driving voltage by PWM control, and causes the air to flow in the air passage 8 by blowing air by the air-blowing fan 17. When the set rotating speed is reached, the set rotating speed is changed on the basis of a duty ratio variable in accordance with flow resistance of the air passage 8, to maintain the rotating speed of the air-blowing fan 17 at the new rotating speed.

Description

  The present invention relates to a blower device including a blower fan that is PWM-controlled.

  A conventional blower is disclosed in Patent Document 1. This blower device includes an air conditioner and includes a housing that opens a suction port and a blower port. An air passage that communicates the suction port and the air outlet is provided in the housing. A blower fan and a heat exchanger are arranged in the air passage. The blower fan has a fan motor that is PWM controlled, and rotates while maintaining a predetermined set rotational speed. A dust collection filter that collects dust is disposed between the blower fan and the suction port.

  When the operation of the blower is started, the blower fan is driven. Thereby, indoor air flows in into an air path from a suction inlet by ventilation of a ventilation fan. At this time, the duty ratio of the drive voltage is varied so that the fan motor of the blower fan is maintained at the set rotation speed by PWM control. The air that has flowed into the air passage is collected by a dust collecting filter, and heat-exchanged with a heat exchanger to adjust the temperature. And the temperature-controlled air is sent out from a blower outlet, and indoor air conditioning is performed.

  When the dust collection filter is clogged due to the accumulation of dust, the flow resistance of the air passage increases, so the amount of air flowing into the air passage from the suction port decreases. Thereby, since the load of a fan motor becomes small, the rotation speed of a ventilation fan rises. For this reason, the duty ratio of the drive voltage of the fan motor is lowered to maintain the blower fan at the set rotational speed.

Japanese Patent No. 3748964 (pages 4-12, FIG. 6)

  However, according to the conventional blower described above, when the flow resistance of the air passage becomes large due to clogging of the dust collecting filter or the like, the blower fan is maintained at a constant set rotational speed by PWM control. For this reason, there was a problem that a desired air volume could not be obtained and comfort was lowered.

  Similarly, when the flow resistance of the air passage is reduced, the blower fan is similarly maintained at a constant set rotational speed by PWM control. At this time, there is a problem that the duty ratio of the driving voltage of the blower fan is increased and power consumption is increased, and there is a danger that overcurrent flows through the fan motor and exceeds the rated current.

  An object of this invention is to provide the air blower which can prevent an air volume fall. Another object of the present invention is to provide a blower that can save power and prevent overcurrent of the blower fan.

  In order to achieve the above object, the present invention includes an air passage and a blower fan that is disposed in the air passage and that maintains a predetermined set rotational speed by varying a duty ratio of a drive voltage by PWM control. An air blower that blows air through the air passage and distributes the air flow in the air passage when the set rotational speed is reached, based on the duty ratio that differs according to the flow resistance of the air passage. The number is changed, and the rotation speed of the blower fan is maintained at the set rotation speed after the change.

  According to this configuration, the blower fan is driven to blow air into the air passage, and the airflow circulates through the air passage. At this time, the duty ratio of the drive voltage is varied so that the blower fan is maintained at the set rotation speed by PWM control. When the set rotational speed is reached, the set rotational speed is changed when the duty ratio of the driving voltage of the blower fan is larger or smaller than the predetermined value. Then, the blower fan is PWM controlled so as to maintain the set rotational speed after the change.

  Further, the present invention is characterized in that, in the blower configured as described above, when the duty ratio when reaching the set rotational speed is smaller than a predetermined value, the changed set rotational speed is made larger than before the change. Yes. According to this configuration, when the flow resistance of the air passage is large, the duty ratio of the driving voltage of the blower fan becomes small when the blower fan reaches the set rotational speed. At this time, if the duty ratio is smaller than a predetermined value, the set rotational speed is changed and increased.

  Further, the present invention is characterized in that, in the blower configured as described above, when the duty ratio when reaching the set rotational speed is larger than a predetermined value, the changed set rotational speed is made smaller than before the change. Yes. According to this configuration, if the flow resistance of the air passage is small, the duty ratio of the driving voltage of the blower fan increases when the blower fan reaches the set rotational speed. At this time, if the duty ratio is larger than a predetermined value, the set rotational speed is changed to be smaller.

  Further, the present invention, in the air blower configured as described above, includes a housing that opens a suction port and a blower port that communicate with each other through the air passage, and a lid that is attached to the housing and opens and closes the suction port. When the blower fan is driven, the air sucked from the suction port is sent out from the blower outlet, and when the lid is opened, the casing is erected on the table by the support of the lid, and the lid When the valve is closed, the air is sucked from the suction port through a gap between the lid and the casing, and the set rotation is detected by detecting a change in the flow resistance of the air passage due to opening and closing of the lid by the duty ratio. It is characterized by changing the number.

  According to this configuration, when the lid is opened and placed on the table, the casing is erected on the table by the support of the lid. When the blower fan is driven, ambient air flows from the suction port into the air passage and is sent out from the blowout port toward the user's head and the like. Further, the suction port is closed by the lid when carrying the blower. At this time, the flow resistance of the air passage is greater than when the lid is opened. When the blower fan is driven, the surrounding air is guided to the suction port through the gap between the lid and the housing, and the air flowing through the air passage is sent from the outlet toward the user's head and the like. .

  Further, the present invention provides a portable air blower configured as described above, wherein a housing having an inlet and an air outlet that communicate with each other through the air passage, and an air passage and a water absorbing property are disposed in the air passage. A detachable humidifying filter for humidifying the air flowing through the air passage; a water tray in which the humidifying filter is immersed; and a dust collecting filter disposed in the air passage; The air sucked from the suction port is removed by the dust collecting filter, humidified by the humidifying filter, sent out from the outlet, and a change in the flow resistance of the air passage due to the attachment / detachment of the humidifying filter is detected by the duty ratio. Thus, the set rotational speed is changed.

  According to this configuration, the humidifying filter absorbs water by being immersed in the water receiving tray at the time of mounting. When the blower fan is driven, ambient air flows from the suction port into the air passage. The air flowing into the air passage is dedusted by the dust collecting filter and is humidified when passing through the humidifying filter. The humidified air is sent out from the outlet. When the humidifying filter is removed and the blower fan is driven, the surrounding air flows into the air passage from the suction port, is removed by the dust collecting filter, and is sent out from the outlet. At this time, the flow resistance of the air passage is smaller than when the humidifying filter is attached.

  According to the present invention, in the air blower configured as described above, an ion generator for discharging ions is provided in the air passage. According to this structure, the air containing an ion is sent by the drive of a ventilation fan and an ion generator. Thereby, sterilization etc. of a user's circumference and a room | chamber interior etc. can be performed.

  According to the present invention, when the blower fan controlled by PWM reaches the set rotational speed, the set rotational speed is changed based on the duty ratio of the drive voltage, and the rotational speed of the blower fan is maintained at the changed set rotational speed. ing. As a result, when the flow resistance of the air passage becomes greater than the flow resistance corresponding to the initial set rotational speed, the set rotational speed can be increased to prevent a reduction in the air volume. Further, when the flow resistance of the air passage becomes smaller than the flow resistance corresponding to the initial set rotational speed, it is possible to reduce the set rotational speed to reduce the power consumption of the blower fan and to prevent overcurrent.

The perspective view which looked at the air blower of 1st Embodiment of this invention from the front. The perspective view which looked at the air blower of 1st Embodiment of this invention from the back. Cross section of the right side of the air blower of the first embodiment of the present invention Left side sectional view of the air blower according to the first embodiment of the present invention. BB sectional view of FIG. CC sectional view of FIG. The perspective view which shows the air blower of 2nd Embodiment of this invention. Right side sectional view showing the air blower of the second embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of the air blower according to the first embodiment as viewed from the front. The blower device 1 is configured to be portable, and includes a thin box-shaped housing 2 having a substantially rectangular shape in plan view and formed in a portable size. A display unit 4 is provided on the front surface 2 a orthogonal to the thickness direction of the housing 2. The display unit 4 is formed by a liquid crystal display panel or the like, and displays an operation state or the like of the blower device 1.

  A back surface 2b facing the front surface 2a is orthogonal to the thickness direction of the housing 2 and is covered with a rotatable lid 3. A power switch 5 is provided on one side surface 2c forming the peripheral surface of the housing 2 adjacent to the front surface 2a and the back surface 2b. A blower outlet 7 is opened in the upper surface 2 d that forms the peripheral surface of the housing 2. The blower outlet 7 is provided with a grid-like grill 7a.

  FIG. 2 is a perspective view of the air blower 1 as seen from the back, showing a state in which the lid 3 is opened. The lid 3 is pivotally supported by the housing 2 at the lower end away from the air outlet 7, and a suction port 6 made up of a plurality of small holes opens on the back surface 2 b of the housing 2. When the lid 3 is opened, the suction port 6 is exposed, and when the lid 3 is closed, the suction port 6 and the periphery of the suction port 6 are covered. Moreover, when the cover part 3 is opened, the housing 2 can be erected on the table by the support of the cover part 3 to install the blower 1.

  3 and 4 show a right side cross-sectional view of the blower 1 with the lid 3 closed and a left side cross-sectional view of the blower 3 with the lid 3 open. 5 and 6 show a BB sectional view and a CC sectional view of FIG. The housing 2 has a back panel 2f that forms a back surface 2b. The rear panel 2f has an opening at the front and a cross-section of the upper surface formed in a U-shaped cross section.

  The opening on the front surface of the rear panel 2 f is covered with a partition panel 22. The partition panel 22 is attached to the back panel 2f by screws (not shown) that are screwed into the screw holes 22a. A front panel 2e having a U-shaped cross section on the upper surface forming the front surface 2a of the housing 2 is engaged with the front surface of the partition panel 22.

  A cap-shaped upper cover 2g is fitted over the front panel 2e and the back panel 2f. The side surface of the housing 2 is formed by a front panel 2e and a back panel 2f having a U-shaped cross section. An attachment hole 2h for attaching a neck strap is provided in the upper part of the back panel 2f, and the blower 1 can be suspended from the user's neck and carried.

  The lid 3 is pivotally supported on the housing 2 by a hinge mechanism 10. The hinge mechanism 10 includes a first shaft 11, a second shaft 12, a gear 13, and a tension spring 14. The first shaft 11 is provided integrally with the lid 3 and is rotatably supported by the back panel 2f. The first shaft 11 forms a rotation axis of the lid portion 3.

  The second shaft 12 is supported by the back panel 2 f and is arranged to be movable in the radial direction of the first shaft 11. The gear 13 is provided integrally with the first shaft 11, and a plurality of teeth 13a are formed in a range where the central angle is narrower than 90 °. The second shaft 12 is disposed between adjacent teeth 13 a of the gear 13. The tension spring 14 constitutes an urging means for urging the first shaft 11 and the second shaft 12 at both ends and urging the second shaft 12 in a direction of pressing the gear 13 against the gear 13.

  The first shaft 11 and the gear 13 are integrally rotated by the rotation of the lid 3, and the second shaft 12 is moved in the direction of the tooth tip of the gear 13 against the urging force of the tension spring 14. And the 2nd shaft 12 moves relatively between the teeth 13a in the circumferential direction, and can arrange | position the cover part 3 with respect to the housing | casing 2 at a desired angle of 90 degrees or less.

  When the lid 3 is closed, a gap 23 is formed between the lid 3 and the rear panel 2f. The gap 23 is provided between both end surfaces of the lid 3, and outside air can flow into the suction port 6 through the gap 23 with the lid 3 closed. Further, a concave portion 3 a is provided on the inner surface of the lid portion 3 at a portion facing the suction port 6. The size D1 of the gap 23 facing the suction port 6 due to the recess 3a is larger than the size D2 of the gap 23 facing the periphery of the suction port 6. Note that the gap 23 facing the periphery of the suction port 6 may be omitted and D2 = 0.

  Although the thickness of the lid 3 is reduced by the recess 3a, the enlargement of the blower 1 can be suppressed and the strength of the lid 3 can be ensured by the thickness of the portion facing the periphery of the suction port 6. The strength of the lid 3 may be improved by projecting the back side of the recess 3a of the lid 3 to increase the thickness. Since the part which the cover part 3 protruded is a part which opposed the suction inlet 6 at this time, the enlargement of the air blower 1 can be suppressed.

  An air passage 8 is formed in the rear panel 2 f so that the front surface is covered by the partition panel 22 and connects the suction port 6 and the outlet 7. A blower fan 17 including a centrifugal fan is disposed in the air passage 8.

  The blower fan 17 includes a fan motor and an impeller (both not shown) that are PWM-controlled. With the PWM control, the duty ratio of the drive voltage is varied so that the fan motor of the blower fan 17 is maintained at the set rotational speed.

  An intake port (not shown) of the blower fan 17 is arranged to face the suction port 6, and an exhaust port (not shown) is arranged toward the blowout port 7. The blower fan 17 is disposed at a predetermined distance in the axial direction with respect to the rear panel 2f, and the suction port 6 is provided with a dust collection filter 16 that is fixed to the inner surface side of the rear panel 2f and collects dust. .

  With the partition panel 22, an isolation chamber 22 b is formed at the upper front side of the housing 2, and an isolation chamber 22 c is formed at the lower front side. A control board 15 on which the control circuit of the blower 1 is mounted is attached to the back side of the partition panel 22. Terminal portions 15a facing the isolation chambers 22b and 22c are connected to the control board 15. The ion generator 18 and the battery 19 housed in the isolation chambers 22b and 22c are connected to the control circuit via the terminal portion 15a.

The ion generator 18 has a plurality of electrodes (not shown) facing the air passage 8. A voltage having an AC waveform or an impulse waveform is applied to the electrodes. A positive voltage is applied to one electrode, and hydrogen ions generated by ionization are combined with moisture in the air to form positive cluster ions mainly composed of H ⁺ (H ₂ O) m. A negative voltage is applied to the other electrodes, and oxygen ions generated by ionization are combined with moisture in the air to form cluster ions having a negative charge mainly composed of O ₂ ⁻ (H ₂ O) n. Here, m and n are arbitrary natural numbers.

H ⁺ (H ₂ O) m and O ₂ ⁻ (H ₂ O) n aggregate on the surface of airborne bacteria and odorous components and surround them. Then, as shown in the formulas (1) to (3), [.OH] (hydroxyl radical) and H ₂ O ₂ (hydrogen peroxide) which are active species are collided on the surface of floating bacteria, odorous components, etc. Aggregate to break them. Here, m ′ and n ′ are arbitrary natural numbers.

H ⁺ (H ₂ O) m + O ₂ ⁻ (H ₂ O) n → OH + 1 / 2O ₂ + (m + n) H ₂ O (1)
_{^{H + (H 2 O) m}} + H + (H 2 O) m '+ O 2 - (H 2 O) n + O 2 - (H 2 O) n'
→ 2 OH + O ₂ + (m + m ′ + n + n ′) H ₂ O (2)
_{^{H + (H 2 O) m}} + H + (H 2 O) m '+ O 2 - (H 2 O) n + O 2 - (H 2 O) n'
→ H ₂ O ₂ + O ₂ + (m + m ′ + n + n ′) H ₂ O (3)

  In the air blower 1 having the above configuration, the air blower 1 is carried with the lid 3 closed. When the lid 3 is opened at a desired angle and placed on the table, the housing 2 is erected on the table by the support of the lid 3. When the power switch 5 is turned on, the blower fan 17 and the ion generator 18 are driven. As the blower fan 17 is driven, outside air flows into the air passage 8 through the suction port 6 as shown by an arrow A1 (see FIG. 4).

  At this time, the drive voltage of the fan motor of the blower fan 17 is driven at, for example, 25 kHz (period 40 μs), and the duty ratio is varied by PMW control. And the ventilation fan 17 is maintained by the predetermined setting rotation speed (for example, 1000 rpm). When the rotational speed of the blower fan 17 reaches 1000 rpm, the duty ratio of the drive voltage of the fan motor of the blower fan 17 is, for example, 65%. The set rotational speed is set in advance so that a desired air volume is obtained with the lid 3 opened.

  The air flowing into the air passage 8 is collected by the dust collecting filter 16 and removed. As shown by the arrow A2 (see FIGS. 3 and 4), the air flowing through the air passage 8 includes ions generated by the ion generator 18. And as shown by arrow A3 (refer FIG. 3, FIG. 4), the air flow containing a positive ion and a negative ion is sent toward the upper user's head etc. from the blower outlet 7. FIG. Thereby, while being able to obtain coolness easily outdoors or indoors, disinfection around a user and odor removal can be performed.

  Further, when the lid 3 is closed when the blower 1 is carried, the suction port 6 is covered with the lid 3. Thereby, falling off of the dust adhering to the dust collecting filter 16 is prevented, and dust scattering to the surroundings and dust adhering to clothes can be prevented.

  When the power switch 5 is turned on while the blower 1 is suspended from the user's neck or held, the outside air is sucked through the gap 23 as shown by an arrow A4 (see FIGS. 5 and 6). Guided to mouth 6.

  At this time, since the lid 3 is closed, the flow resistance of the air passage 8 becomes larger than when the lid 3 is opened. Thereby, the amount of air sucked from the suction port 6 is reduced, the load of the blower fan 17 is reduced, and the duty ratio of the drive voltage of the blower fan 17 is lowered. That is, as shown in the above example, if the initial set rotational speed is 1000 rpm, the duty ratio when reaching 1000 rpm with the lid 3 closed is lower than 65%.

  In this state, when the blower fan 17 is maintained at the initial set rotational speed, the air volume is reduced. For this reason, when it is detected that the duty ratio is lower than the predetermined value, the set rotational speed is changed and increased. Then, the blower fan 17 is PMW-controlled so as to be maintained at the set rotational speed (for example, 1300 rpm) after the change. When the rotational speed of the blower fan 17 reaches 1300 rpm, the duty ratio of the drive voltage of the fan motor of the blower fan 17 is, for example, 55%.

  Thereby, the fall of the air volume at the time of closing the cover part 3 can be prevented. At this time, since a decrease in the load of the blower fan 17 can be determined by the duty ratio, it is not necessary to provide a separate detection sensor. The decrease in the duty ratio may be determined by detecting the pulse width of the driving voltage of the blower fan 17.

  In addition, the flow path area of the portion facing the suction port 6 is larger than the portion facing the periphery of the suction port 6 due to the concave portion 3 a provided in the lid portion 3. Therefore, a decrease in the flow rate can be suppressed, and the set rotational speed after the change can be reduced to save power.

  The air flow containing ions is sent upward from the air outlet 7 disposed on the upper surface 2d. Thus, coolness can be obtained even when the blower 1 is carried, and sterilization and odor removal around the user can be performed.

  According to the present embodiment, when the blower fan 17 that is PWM-controlled reaches the set rotational speed, the set rotational speed is changed based on the duty ratio of the drive voltage, and the rotational speed of the blower fan 17 is changed. To maintain. As a result, when the flow resistance of the air passage 8 becomes larger than the flow resistance corresponding to the initial set rotational speed, the set rotational speed can be greatly changed to prevent a decrease in the air volume. At this time, the change in the flow resistance of the air passage 8 can be easily detected by the duty ratio of the drive voltage of the blower fan 17 when the set rotational speed is reached.

  In addition, when the lid 3 is opened, the casing 2 is erected on the table by the support of the lid 3 so that the blower 1 can be installed. Can be reduced. Further, when the lid 3 is closed, a gap 23 is provided between the lid 3 and the housing 2, and the outside air is guided to the suction port 6 through the gap 23 by driving the blower fan 17. Coolness can be obtained even when one is carried. At this time, when the lid 3 is closed and the flow resistance of the air passage 8 is increased, the set rotational speed is increased by detecting the duty ratio, and a desired air volume is obtained.

  Moreover, since the ion generator 18 which discharge | releases ion is provided in the air channel | path 8, disinfection around a user and odor removal can be performed.

  In the present embodiment, an initial set rotational speed (for example, 1300 rpm) of the blower fan 17 may be set so that a desired air volume is delivered when the lid 3 is closed. As a result, when the load on the blower fan 17 increases due to a decrease in the flow resistance when the lid portion 3 is opened and the duty ratio increases, the set rotational speed is changed and reduced. And the ventilation fan 17 is maintained by the setting rotation speed (for example, 1000 rpm) after a change by PWM control. Therefore, power saving of the blower fan 17 can be achieved when the lid portion 3 is opened, and an overcurrent exceeding the rated current of the fan motor can be prevented.

  Next, FIG. 7 has shown the perspective view of the air blower of 2nd Embodiment. For convenience of explanation, the same reference numerals are given to the same parts as those in the first embodiment shown in FIGS. The blower 31 constitutes a humidifier, and includes a casing 32 having a plurality of casters 33 on the bottom surface and installed on the floor surface or the like. An air outlet 7 is opened on the upper surface of the housing 32, and a suction port 6 (see FIG. 8) is opened on the rear surface. An operation unit 34 is provided on the upper surface of the housing 32.

  FIG. 8 shows a side sectional view of the blower 31. An air passage 40 that connects the suction port 6 and the air outlet 7 is provided inside the housing 32. The upper portion of the air passage 40 is divided in the front-rear direction by a partition wall 40 a extending downward from the upper end of the housing 32. A blower fan 17 including a centrifugal fan is disposed in the lower part of the air passage 40. In the air passage 40, an intake passage 41 is formed behind the partition wall 40a on the upstream side of the blower fan 17, and an exhaust passage 42 extending upward is formed in front of the partition wall 40a on the downstream side.

  The blower fan 17 includes a fan motor 17a that is PWM-controlled and an impeller 17b that is rotated by the fan motor 17a. With the PWM control, the duty ratio of the driving voltage is varied so that the blower fan 17 is maintained at the set rotational speed.

  A deodorizing filter 35 and a dust collection filter 36 are stacked in the intake passage 41 of the air passage 40 so as to face the suction port 6. The deodorizing filter 35 is formed, for example, by dispersing and holding activated carbon on a nonwoven fabric, and adsorbs and removes odorous components in the air. The dust collection filter 36 is formed by, for example, a HEPA filter, and collects fine dust in the air. Therefore, the blower 31 also functions as an air cleaner that takes in indoor air and removes dust and odor components.

  A humidification filter 50 is disposed between the blower fan 17 and the dust collection filter 36. The humidifying filter 50 is formed by holding a disc-shaped water absorbing material 50a by a holding frame 50b, and a shaft portion 50c is provided at the center of the holding frame 50b. A water receiving tray 53 is disposed below the humidifying filter 50, and the humidifying filter 50 is rotatably supported by the water receiving tray 53 by a shaft portion 50c.

  The water tray 53 is formed so as to be slidable laterally with respect to the housing 32 and is supplied with water from a detachable water supply tank (not shown). Thereby, the lower part of the humidification filter 50 is immersed in the water receiving tray 53. Further, the humidifying filter 50 is detachably provided to the water tray 53.

  The water absorbing material 50a of the humidifying filter 50 is formed of a non-woven fabric having air permeability and water absorption. As a result, the water absorbing material 50 a absorbs water from the water receiving tray 53 and humidifies the air passing through the intake passage 41 and passing through the humidifying filter 50. A gear portion 50 d is formed on the peripheral surface of the holding frame 50 b of the humidifying filter 50. The gear portion 50 d meshes with a plurality of transmission gears 52 that transmit rotation by a drive motor 51 supported by the housing 32. Thereby, the humidification filter 50 rotates and the air which distribute | circulates the intake path 41 can be humidified uniformly.

  In the vicinity of the air outlet 7, an ion generator 18 similar to that of the first embodiment is arranged facing the exhaust passage 42 of the air passage 40. As a result, ions are released into the air passage 40. The surface of the housing 32 is provided with a dust sensor and an odor sensor (both not shown) for detecting the amount of dust and odor components in the indoor air.

  In the air blower 31 having the above configuration, when the operation of the air blower 31 is started by the operation of the operation unit 34, the drive motor 51, the blower fan 17, and the ion generator 18 are driven. The blower device 31 has a plurality of operation modes, and switches between the weak, medium, and strong operation modes in which the set rotational speed of the blower fan 17 is different as shown in Table 1 by detection of the dust sensor and the odor sensor.

  That is, when the amount of dust or odor component in the indoor air is less than the first threshold value, the operation mode is set to be weak. At this time, the rotation speed of the blower fan 17 is set to a low setting rotation speed (430 rpm). When the amount of dust or odor component in the indoor air is greater than the first threshold, the operation mode is set to inside. At this time, the rotational speed of the blower fan 17 is set to the medium speed setting rotational speed (960 rpm).

  Further, when the amount of dust or odor component in the indoor air is larger than the second threshold value which is larger than the first threshold value, the operation mode is set to be strong. At this time, the rotation speed of the blower fan 17 is set to a high setting rotation speed (1420 rpm). Further, the operation mode can be manually switched by operating the operation unit 34.

  As the blower fan 17 is driven, outside air flows into the air passage 40 through the suction port 6 as shown by an arrow B1 (see FIG. 8). At this time, the drive voltage of the fan motor 17a of the blower fan 17 is driven at, for example, 25 kHz (period 40 μs), and the duty ratio is varied by PMW control. And the ventilation fan 17 is maintained by the setting rotation speed according to the operation mode, and a desired air volume is obtained.

That is, as shown in Table 1, when the operation mode is weak, when the set rotational speed is reached, the power consumption of the blower fan 17 is, for example, 2.80 W, and the air volume is, for example, 0.83 CMM (m ³ / min). ing. When the operation mode is medium, the power consumption of the blower fan 17 is, for example, 12.72 W and the air volume is, for example, 2.81 CMM (m ³ / min) when the set rotational speed is reached. When the operation mode is strong, the power consumption of the blower fan 17 is, for example, 42.07 W when the set rotational speed is reached, and the air volume is, for example, 4.63 CMM (m ³ / min). The duty ratio of the driving voltage of the fan motor 17a of the blower fan 17 is, for example, 65%.

  The odor component of the air flowing into the air passage 40 is removed by the deodorizing filter 35, and the dust is collected by the dust collecting filter 36 and removed. The air from which dust and odor components have been removed passes through the humidifying filter 50 and is humidified. The humidified air flows through the exhaust passage 42 as indicated by an arrow B2 (see FIG. 8), and includes ions generated by the ion generator 18. And as shown by arrow B3 (refer FIG. 8), the airflow containing a positive ion and a negative ion is sent out indoors from the blower outlet 7. As shown in FIG. As a result, it is possible to perform humidification and air purification in the room and perform sterilization and odor removal.

  Moreover, when the humidification filter 50 is removed, the indoor air can be cleaned by the dust collection filter 36 and the deodorizing filter 35. At this time, the flow resistance of the air passage 40 becomes smaller than when the humidifying filter 50 is attached. As a result, the amount of air sucked from the suction port 6 increases, the load on the blower fan 17 increases, and the duty ratio of the drive voltage of the blower fan 17 increases. That is, assuming that the initial set rotational speed is 1420 rpm (when the operation mode is strong), the duty ratio when reaching 1420 rpm with the humidifying filter 50 detached is higher than 65%.

  If the blower fan 17 is maintained at the initial set rotational speed in this state, power consumption increases and there is a risk that overcurrent flows through the fan motor 17a and exceeds the rated current. For this reason, when it is detected that the duty ratio is higher than a predetermined value, the set rotational speed is changed to be small. Then, the blower fan 17 is PMW controlled so as to be maintained at the set rotational speed after the change (for example, 1350 rpm).

That is, as shown in Table 1, when the desorption state of the humidifying filter 50 is detected based on the duty ratio, the set rotational speed is changed from 430 rpm to 360 rpm when the operation mode is weak. When the set rotational speed after the change is reached, the power consumption of the blower fan 17 is 2.40 W, for example, and the air volume is 0.83 CMM (m ³ / min), which is the same as when the humidifying filter 50 is mounted, for example.

When the operation mode is medium, the set rotational speed is changed from 960 rpm to 890 rpm. When the set rotational speed after the change is reached, the power consumption of the blower fan 17 is, for example, 10.2 W, and the air volume is, for example, 2.81 CMM (m ³ / min), which is the same as when the humidifying filter 50 is attached.

When the operation mode is strong, the set rotational speed is changed from 1420 rpm to 1350 rpm. When the set rotational speed after the change is reached, the power consumption of the blower fan 17 is 37.9 W, for example, and the air volume is 4.63 CMM (m ³ / min), which is the same as when the humidifying filter 50 is mounted, for example. Further, the duty ratio of the driving voltage of the fan motor 17a of the blower fan 17 is, for example, 75%.

  Thereby, it is possible to save power when the humidifying filter 50 is detached, and to prevent overcurrent. At this time, since the increase in the load of the blower fan 17 can be determined by the duty ratio, it is not necessary to provide a separate detection sensor. The increase in the duty ratio may be determined by detecting the pulse width of the driving voltage of the blower fan 17.

  According to the present embodiment, when the blower fan 17 that is PWM-controlled reaches the set rotational speed, the set rotational speed is changed based on the duty ratio of the drive voltage, and the rotational speed of the blower fan 17 is changed. Maintained. As a result, when the flow resistance of the air passage 40 becomes smaller than the flow resistance corresponding to the initial set rotational speed, the set rotational speed can be reduced to save power and to prevent overcurrent. it can. At this time, the change in the flow resistance of the air passage 40 can be easily detected by the duty ratio of the driving voltage of the blower fan 17 when the set rotational speed is reached.

  Moreover, since the dust collection filter 16 and the detachable humidification filter 50 are provided, the humidification filter 50 can be removed and the indoor air can be cleaned. At this time, when the humidification filter 50 is detached and the flow resistance of the air passage 40 becomes small, the set rotational speed is changed and made small by detecting the duty ratio of the blower fan 17. Thereby, the power saving of the air blower 31 can be achieved.

  Moreover, since the ion generator 18 which discharges | releases ion in the air passage 40 was provided, the surrounding sterilization and odor removal of a room | chamber interior can be performed.

  In the present embodiment, an initial set rotational speed of the blower fan 17 (for example, 1350 rpm when the operation mode is strong) may be set so that a desired air volume is delivered when the humidifying filter 50 is detached. Thereby, when the humidification filter 50 is mounted, if the load of the blower fan 17 decreases due to an increase in the flow resistance and the duty ratio decreases, the set rotational speed is changed and increased. And the ventilation fan 17 is maintained by the setting rotation speed (for example, 1420 rpm) after a change by PWM control. Accordingly, it is possible to prevent a decrease in the air volume of the blower fan 17 when the humidifying filter 50 is attached.

  In 1st, 2nd embodiment, although the air blowers 1 and 31 which send out the air which distribute | circulates the air passages 8 and 40 from the blower outlet 7 are demonstrated, the air blower which ventilates so that air may be circulated through an air passage It may be. Further, only negative ions may be emitted by the ion generator 18. Thereby, a user's relaxation effect can be acquired.

  According to this invention, it can utilize for the air blower provided with the ventilation fan by which PMW control is carried out.

DESCRIPTION OF SYMBOLS 1, 31 Blower 2, 32 Case 2e Front panel 2f Rear panel 2g Top cover 3 Cover part 4 Display part 5 Power switch 6 Suction port 7 Air outlet 8, 40 Air passage 9 Magnet 10 Hinge mechanism 11 1st shaft 12 1st 2 shaft 13 gear 14 tension spring 15 control board 16, 36 dust collecting filter 17 blower fan 18 ion generator 19 battery 22 partition panel 23 gap 35 deodorizing filter 41 intake path 42 exhaust path 50 humidification filter 50a water absorbing material 51 drive motor 52 transmission Gear 53 Water tray

Claims (6)

  An air passage and a blower fan disposed in the air passage and having a duty voltage ratio of a drive voltage varied by PWM control and maintained at a predetermined set rotational speed. In the air blower that circulates the airflow in the passage, when the set rotational speed is reached, the set rotational speed is changed based on the duty ratio that differs according to the flow resistance of the air passage, and the rotational speed of the blower fan Is maintained at the set rotational speed after the change.   The blower according to claim 1, wherein when the duty ratio when the set rotational speed is reached is smaller than a predetermined value, the set rotational speed after the change is made larger than before the change.   The blower according to claim 1 or 2, wherein when the duty ratio when the set rotational speed is reached is larger than a predetermined value, the set rotational speed after the change is made smaller than before the change. apparatus.   A housing having an intake port and an air outlet that communicate with each other through the air passage, and a lid portion that is attached to the housing and opens and closes the suction port, and is sucked from the suction port by driving the blower fan When the air is sent out from the air outlet and the lid is opened, the housing is erected on the table by the support of the lid, and when the lid is closed, the lid and the housing 2. The set rotational speed is changed by detecting a change in the flow resistance of the air passage due to opening and closing of the lid portion based on the duty ratio by suctioning from the suction port through a gap with The blower according to any one of claims 3 to 4.   A housing having an inlet port and an outlet port that communicate with each other through the air passage, and a detachable humidifier that is disposed in the air passage and has air permeability and water absorption and humidifies air flowing through the air passage. A filter, a water tray in which the humidifying filter is immersed, and a dust collecting filter disposed in the air passage, and the air sucked from the suction port by driving of the blower fan is removed by the dust collecting filter. In addition, it is humidified by the humidifying filter and sent out from the outlet, and a change in the flow resistance of the air passage due to the attachment / detachment of the humidifying filter is detected by the duty ratio and the set rotational speed is changed. The air blower in any one of Claims 1-3.   The blower according to any one of claims 1 to 5, wherein an ion generator for discharging ions is provided in the air passage.