JP2013245580A - Air blowing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air blowing device enabled to achieve downsizing.SOLUTION: An air blowing device includes: a case 2 on which a suction port 2a and an outlet port 2b are opened; an air blowing fan 30 comprising a centrifugal fan transversely provided in an axial direction and covered with a casing 30a, and also having a first air suction port 30b facing the suction port 2a opened on one surface in the axial direction of the casing 30a and having a second air suction port 30c opened on the other surface; a circuit board 34 standing in the case 2; a bulkhead 32a for separating the air blowing fan 30 from the circuit board 34 and having an opening 32b facing the second air suction port 30c; a suction duct 20 coupling the suction port 2a with the first air suction port 30b; and auxiliary suction paths 50a and 50b for leading an air flow from the suction port 2a through the opening 32b to the second air suction port 30c. The air flow flows in the auxiliary suction path 50b along the circuit board 34 from downward to upward, and in addition the opening 32b faces an upper part of the circuit board 34.

Description

  The present invention relates to a blower provided with a centrifugal fan.

  A conventional blower is disclosed in Patent Document 1. This blower device includes a housing having an air outlet opened on an upper surface and suction ports opened on opposite side surfaces. A filter is disposed opposite to each suction port. A blower fan composed of a centrifugal fan arranged in the axial direction is arranged in the housing.

  The blower fan is formed in a double-sided suction type in which intake ports are opened on both sides in the axial direction of the casing. Each intake port of the blower fan is disposed opposite to the intake ports on both side surfaces of the housing. The exhaust port of the blower fan is arranged upward. A blowout duct that connects the exhaust port and the blowout port is provided in the housing. A circuit board is disposed between the blowout duct and the inner wall of the housing.

  The airflow sucked into the housing from both suction ports by driving the blower fan flows into the blower fan through the suction port. The airflow that has passed through the blower fan and has flowed out of the exhaust port rises through the blowout duct and is sent out from the blowout port.

JP 2010-80425 A (page 6 to page 14, FIG. 1)

  However, according to the conventional blower described above, it is necessary to provide a large heat dissipation space for the circuit board in the housing in order to prevent failure of the electrical components in the housing due to the heat generated by the circuit board. Thereby, there existed a problem which an air blower became large.

  An object of this invention is to provide the air blower which can achieve size reduction.

  In order to achieve the above object, the present invention comprises a housing that opens a suction port and a blowout port, and a centrifugal fan that is horizontally provided and covered by a casing, and the suction port is formed on one axial surface of the casing. The blower fan having the first air inlet opening facing the air outlet and having the second air inlet opening on the other surface, the circuit board erected in the housing, the blower fan and the circuit board are isolated from each other. A partition having an opening facing the two air inlets, an air inlet duct connecting the air inlet and the first air inlet, and an auxiliary air intake path for guiding an air flow from the air inlet to the second air inlet through the opening And an air flow flows along the circuit board from below to above in the auxiliary suction path, and the opening faces the top of the circuit board.

  According to this configuration, when the blower fan is driven, the airflow sucked into the suction duct from the suction port flows into the casing of the blower fan through the first intake port. Further, a part of the airflow flows through the auxiliary suction path, and the circuit board is cooled by the airflow rising along the circuit board side of the partition wall. The airflow rising along the circuit board is guided to the blower fan side of the partition wall through the opening facing the top of the circuit board, and flows into the casing of the blower fan through the second air inlet. The airflow flowing out from the blower fan is sent out from the outlet.

  According to the present invention, in the air blower configured as described above, a stepped portion that is further away from the second air intake port than the lower portion is provided above the partition wall, and the opening portion has an opening area smaller than the second air intake port. It is characterized by opening on the part. According to this configuration, the airflow flowing through the auxiliary suction passage rises along the circuit board from the lower part where the partition wall approaches the blower fan and is separated from the circuit board. And this airflow is guide | induced to the 2nd inlet of a ventilation fan through the opening part on the level | step-difference part from which the partition and the ventilation fan left | separated.

  Further, the present invention is the air blower configured as described above, further comprising a box-shaped duct member that faces the opening surface of the suction port to form the suction duct, and the partition wall is formed by a wall surface facing the suction port of the duct member. The auxiliary suction path is formed between a chamfered outer surface provided at a lower end of one side wall adjacent to the partition wall and the housing.

  According to this configuration, the opening surface of the box-shaped duct member faces the suction port, and the airflow sucked from the suction port flows through the suction duct formed by the duct member and is guided to the first suction port of the blower fan. Part of the airflow sucked from the suction port flows between the chamfering provided at the lower end of one side wall of the duct member and the housing in the direction parallel to the suction duct, and is guided to the circuit board.

  According to the present invention, in the blower configured as described above, the blower duct that connects the blower fan and the blower outlet, and a pair of discharge electrodes that discharge positively charged particles and negatively charged particles to the blower duct are provided. The discharge electrodes are arranged in parallel in the axial direction of the blower fan. According to this configuration, the positively charged particles and the negatively charged particles discharged from the discharge electrode are included in the airflow flowing through the blowout duct and are sent out from the blowout port.

  According to the present invention, the auxiliary suction path includes the suction duct that guides the airflow from the suction port to the first air inlet, and the auxiliary suction path that guides the airflow to the second air inlet through the opening facing the upper portion of the circuit board. Airflow flows from below to above along the circuit board. Thereby, it can cool from the lower part of a circuit board to the upper part by the airflow which raises toward an opening part. Therefore, it is possible to reduce the size of the blower by reducing the heat dissipation space in the housing of the circuit board.

The top view which shows the air blower of embodiment of this invention The bottom view which shows the air blower of embodiment of this invention The left view which shows the air blower of embodiment of this invention The rear view which shows the air blower of embodiment of this invention Sectional drawing on the right side showing the blower of the embodiment of the present invention Front sectional drawing which shows the air blower of embodiment of this invention Cross-sectional right side view showing a state in which the air outlet of the blower according to the embodiment of the present invention is closed Sectional drawing which shows the back of the air blower of an embodiment of the present invention The perspective view which shows the holding member and ion generating element of the air blower of embodiment of this invention Sectional drawing of right side which shows the state which removed the baseplate of the air blower of embodiment of this invention The bottom view which shows the state which removed the power plug of the air blower of embodiment of this invention The top view which omitted the wind direction board of the air blower of embodiment of this invention

<First Embodiment>
Embodiments of the present invention will be described below with reference to the drawings. 1, 2, 3, and 4 show a top view, a bottom view, a left side view, and a rear view of an air blower according to an embodiment. The blower device 1 includes a cubic housing 2, and a suction port 2 a (see FIG. 6) is opened on the left side surface of the housing 2, and an air outlet 2 b is opened on the upper surface. The blower outlet 2b is formed in a circular shape, and a wind direction plate 10 supported so as to be movable up and down with respect to the housing 2 is disposed to face the blower outlet 2b.

  The bottom plate 3 of the housing 2 is detachably provided, and rubber legs 4 are provided at the four corners of the bottom plate 3. Thereby, the air blower 1 can be installed and used on a desktop etc. Further, the rear surface of the housing 2 is provided with a hooking hole 2c that is hooked on a hook provided on a wall surface in the room. Thereby, the air blower 1 can also be hung on a wall surface and used.

  A power cord 5 is connected to the right end of the bottom surface of the housing 2. The power cord 5 is connected by inserting a plug 6 provided at one end into a terminal portion 35 (see FIG. 6) through an insertion hole 3a (see FIG. 6) provided in the bottom plate 3. The other end of the power cord 5 is connected to a power supply source such as a commercial power source or a USB terminal to supply power to the blower 1.

  5 and 6 show a right side sectional view and a front sectional view of the blower 1. The wind direction plate 10 has a circular planar shape having substantially the same diameter as the air outlet 2b, and the lower surface 10a is formed in a substantially truncated cone shape having an inclined surface. A sleeve 11 is attached to the center of the wind direction plate 10. The sleeve 11 is fitted to a shaft portion 17 disposed on the housing 2, and can move up and down relative to the housing 2 together with the wind direction plate 10. The shaft portion 17 passes through a through hole 25d opened at the center of a light guide plate 25 described later, and is supported by a duct member 32 disposed in the housing 2.

  The shaft portion 17 is provided with first and second locking claws 17a and 17b arranged in the vertical direction, and a compression spring 16 for urging the wind direction plate 10 upward. An engagement member 12 that engages with the first and second locking claws 17 a and 17 b is attached in the sleeve 11. A power switch 18 is disposed on the upper surface of the duct member 32.

  The wind direction plate 10 urged by the compression spring 16 moves between a position where the air outlet 2b is opened and a position where the air outlet 2b is closed by the engagement of the first and second locking claws 17a, 17b and the engaging member 12. That is, as shown in the figure, when the engaging member 12 is engaged with the second locking claw 17b, the air outlet 2b is opened. At this time, the power switch 18 is turned on.

  When the airflow direction plate 10 is pushed down from the open state of the air outlet 2b and the engaging member 12 is engaged with the first locking claws 17a as shown in FIG. 7, the airflow direction plate 10 closes the air outlet 2b. At this time, the sleeve 11 contacts the power switch 18, and the power switch 18 is turned off. Moreover, if the wind direction board 10 is pushed down from the state which closed the blower outlet 2b, as shown in FIG. 5, the wind direction board 10 will pop up.

  Thereby, the power switch 18 is turned on and off by the vertical movement of the wind direction plate 10, and the blower fan 30, the ion generating element 40 and the LED 26 described later are driven when the power switch 18 is turned on. Further, when the air outlet 2b is opened, an annular outflow portion 8 is formed by which the airflow is radially sent out between the air outlet 2b and the wind direction plate 10 by the air direction plate 10 having substantially the same diameter as the air outlet 2b.

  The duct member 32 is disposed in the lower part of the housing 2 and is formed in a box shape having an opening surface at one end facing the suction port 2a. In the duct member 32, a blower fan 30 including a centrifugal fan such as a sirocco fan covered with a casing 30a is disposed. The blower fan 30 is horizontally held in the axial direction and is screwed and held on a fan holding portion 32a formed of the right side wall of the duct member 32.

  In the casing 30a, intake ports 30b and 30c (first and second intake ports) are opened on both surfaces in the axial direction, and an exhaust port 30d is opened on the end surface in the circumferential direction. The duct member 32 forms the suction duct 20 that connects the suction port 2a and the one suction port 30b. A filter 23 detachable from the bottom surface of the housing 2 is disposed at the suction port 2a.

  A stepped portion 32e is formed at the upper portion of the right side wall of the duct member 32 with respect to the lower portion. An opening 32b having an opening area smaller than that of the intake port 30c is opened in the stepped portion 32e so as to face the intake port 30c. A notch 32d (see FIG. 8) is provided at the right end facing the suction port 2a on the back side of the duct member 32. A chamfer 32c is applied to the bottom of the duct member 32 on the back side, and a passage 50a parallel to the suction duct 20 is formed between the chamfer 32c and the inner surface of the housing 2.

  On the right side of the duct member 32, a circuit board 34 on which electronic parts such as the terminal portion 35 are mounted is erected and disposed. Thereby, a partition that separates the blower fan 30 and the circuit board 34 is formed by the fan holding portion 32 a, and a passage 50 b is formed between the outer surface of the partition and the inner surface of the housing 2.

  The airflow flowing into the suction duct 20 from the suction port 2a by driving the blower fan 30 is guided to the suction port 32b as indicated by an arrow A1. Further, as shown by an arrow A2 in the rear cross-sectional view of FIG. 8, a part of the airflow flows out from the suction duct 20 through the notch 32d and flows downward, and passes through the passage 50a outside the chamfer 32c to the right. Distributes to the left (in the figure) The airflow flows upward along the circuit board 34 through the passage 50b and is guided to the air inlet 32c through the opening 32b.

  Accordingly, the passages 50a and 50b form an auxiliary suction path that branches from the suction duct 20 and guides the airflow from the suction port 2a to the suction port 30c. Thereby, air current can be sucked in from the both surfaces of the blower fan 30 in the axial direction through a plurality of paths, and the air blowing efficiency can be improved. In addition, it is possible to send a uniform air flow from the blower fan 30 while preventing an uneven flow rate in the axial direction. In addition, you may form the auxiliary | assistant suction path which faces the suction inlet 2a, without providing the notch part 32d.

  Moreover, the electronic component mounted on the circuit board 34 can be cooled by the airflow flowing through the passage 50b. At this time, the opening 32b is provided on the stepped portion 32e at the top of the duct holding portion 32a, and is formed to have a smaller diameter than the intake port 30c so as to face the upper portion of the standing circuit board 34. Thereby, it can cool reliably from the lower part of the circuit board 34 to the upper part with the airflow which distribute | circulates toward the opening part 32b from the downward direction.

  In addition, since the duct holding portion 32a approaches the blower fan 30 below the step portion 32e, the passage 50b has a wide lower flow passage through which airflow is bent and flows from the passage 50a. In addition, since the air inlet 30c and the duct holding portion 32a are separated by the step portion 32e, the airflow can be diffused from the small diameter opening 32b and guided to the large diameter air intake 30c. Accordingly, the air blowing efficiency can be further improved.

  A first blowing duct 21 is provided in front of the exhaust port 30 d of the blower fan 30. Above the first outlet duct 21, a second outlet duct 22 that opens the outlet 2b is provided. The 1st blowing duct 21 and the 2nd blowing duct 22 are connected via the communicating port 25b of the light-guide plate 25 mentioned later.

  The upper part of the first blowing duct 21 is formed by a duct member 32, and the lower part is formed by a holding member 45 that holds the ion generating element 40 and is adjacent to the exhaust port 30d. FIG. 9 shows a perspective view of the holding member 45 holding the ion generating element 40. The holding member 45 has a bent portion 45a in which an opening 45b having substantially the same width in the left-right direction as the exhaust port 30d is opened at the rear end face and the flow path is widened in the left-right direction.

  The front wall 45c of the bent portion 45a is formed by a curved surface continuous with the lower end of the casing 30a of the blower fan 30, and is inclined to face the exhaust port 30d. As a result, the airflow is bent and guided upward through the bent portion 45a. At this time, the air flow sent out from the exhaust port 30b collides with the front wall 45c of the bent portion 45a, and the dynamic pressure is converted into a static pressure and decelerated. Further, the dynamic pressure is also converted to static pressure by the widening of the flow path by the bent portion 45a, and the airflow is further decelerated. Therefore, the bending part 45a comprises the static pressure conversion part which converts the dynamic pressure of an airflow into a static pressure.

  The front wall 45c of the bent portion 45a is provided with a partition plate 45d extending vertically in the center portion facing the opening portion 45b.

  The ion generating element 40 has a pair of needle-like discharge electrodes 41 arranged in parallel in the left-right direction (the axial direction of the blower fan 30) facing the first blowing duct 21. The discharge electrode 41 is disposed immediately above the bent portion 45a, and the distance between both the discharge electrodes 41 is formed wider than the width of the opening 45b.

The discharge electrode 41 of the ion generating element 40 generates a corona discharge by applying a high voltage having an AC waveform or an impulse waveform. A positive voltage is applied to one of the discharge electrodes 41, and water molecules in the air are ionized by corona discharge to generate hydrogen ions. This hydrogen ion is clustered with water molecules in the air by solvation energy. As a result, positive ions of air ions composed of H ⁺ (H ₂ O) m (m is 0 or an arbitrary natural number) are released.

A negative voltage is applied to the other discharge electrode 41, and oxygen ions or water molecules in the air are ionized by corona discharge to generate oxygen ions. This oxygen ion is clustered with water molecules in the air by solvation energy. Thereby, negative ions of air ions composed of O ₂ ⁻ (H ₂ O) n (n is an arbitrary natural number) are released.

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), the active species [.OH] (hydroxyl radical) and H ₂ O ₂ (hydrogen peroxide) are aggregated and formed on the surface of the microorganism or the like by collision. Destroy airborne bacteria and odorous components. Here, m ′ and n ′ are arbitrary natural numbers. Accordingly, by sending positive ions and negative ions into the room from the air outlet 2b, the room can be sterilized and the odor can be removed.

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)

  By arranging the pair of discharge electrodes 41 in the left-right direction perpendicular to the airflow, it is possible to suppress the disappearance due to the collision between the positive ions and the negative ions and increase the amount of ions to be sent.

  In addition, since the discharge electrode 41 is disposed immediately above the bent portion 42a, ions generated at the discharge electrode 41 are included in the airflow that has been converted to static pressure by the bent portion 42a and decelerated. Thereby, the ion which generate | occur | produced in the discharge electrode 41 can be reliably conveyed with an airflow, and the sending amount of ion can be increased.

  At this time, since the distance between the discharge electrodes 41 is larger than the width of the opening 45b and the discharge electrodes 41 are arranged on both sides of the opening 45b, ions can be more reliably included in the decelerated airflow. . Further, since the blower fan 30 has the intake ports 30b and 30c on both sides and sends the airflow uniformly in the axial direction, the flow rate of the airflow flowing around each discharge electrode 41 can be made substantially equal. In addition, the flow rate of the airflow flowing around each discharge electrode 41 can be made more uniform by the partition plate 45d. Therefore, it is possible to send an air flow that uniformly contains positive ions and negative ions.

  As shown in FIG. 10, the holding member 45 can be detached from the bottom surface of the housing 2 by removing the bottom plate 3. Thereby, the ion generating element 40 can be replaced | exchanged easily. In addition, the blade 30e (see FIG. 6) of the blower fan 30 can be cleaned through the exhaust port 30d exposed by the attachment and detachment of the holding member 45. Similarly, the filter 23 (see FIG. 6) can be detached from the bottom surface of the housing 2 by removing the bottom plate 3, and the filter 23 can be easily cleaned.

  The ion generating element 40 has a connection terminal 40a on the upper surface. When the ion generating element 40 is mounted together with the holding member 45 from below, the connection terminal 40a comes into contact with the terminal portion 42 (see FIG. 5) provided in the housing 2 so that power can be supplied to the ion generating element 40. For this reason, the weight of the ion generating element 40 is not weighted to the terminal part 42, and the failure of the terminal part 42 by continuing weighting can be prevented.

  The bottom plate 3 of the housing 2 can be removed with the plug 6 (see FIG. 6) of the power cord 5 removed as shown in the bottom view of FIG. Thereby, the electric shock by being energized when the bottom plate 3 is removed can be prevented.

  5 and 6, the light guide plate 25 is horizontally disposed on the upper surface of the first outlet duct 21. The light guide plate 25 is formed in a flat plate shape by a transparent member such as acrylic, and an LED 26 (light source) is disposed so as to face the incident surface 25a on the rear end surface. A reflection sheet (not shown) is disposed on the lower surface of the light guide plate 25.

  Light emitted from the LED 26 enters the light guide plate 25 from the incident surface 25a and is guided, and light incident on the upper and lower surfaces at an incident angle smaller than the critical angle is emitted. At this time, the light emitted from the lower surface of the light guide plate 25 is reflected upward by the reflection sheet. Thereby, light is emitted from the upper surface (emission surface) of the light guide plate 25 toward the air outlet 2b. A plurality of prisms that reflect the light guide upward may be provided on the lower surface of the light guide plate 25.

  A through hole 25d through which the shaft portion 17 passes is opened at the center of the light guide plate 25, and a communication port 25b is opened at a front portion opposite to the incident surface 25a with respect to the through hole 25d. Since the 1st blowing duct 21 is distribute | arranged to the front part of the housing | casing 2, the communication port 25b which faced the 1st blowing duct 21 is provided in the front part eccentric with respect to the blower outlet 2b.

  A second blowing duct 22 is provided above the light guide plate 25. The 2nd blowing duct 22 has the blower outlet 2b on the upper surface, and is formed in the cylinder shape concentric with the blower outlet 2b. The vertical cross section of the inner wall 22a of the second blow-out duct 22 is formed in a curved shape with a narrow bottom.

  FIG. 12 shows a top view of the housing 2 without the wind direction plate 10. The communication port 25b of the light guide plate 25 is provided with a wind direction variable portion 25c that guides the airflow rising through the first blowout duct 21 forward and is provided in a lattice shape. The front part of the second blow-out duct 22 is provided with a recess 22b that is recessed in the inner wall 22a. The inner surface of the recess 22b is formed of a conical surface having a straight vertical section, and the lower end of the recess 22b is formed along the communication port 25b and the upper end is formed inside the periphery of the outlet 2b.

  In the air blower 1 having the above configuration, when the wind direction plate 10 is popped up and the air outlet 2b is opened, the air blowing fan 30, the ion generating element 40, and the LED 26 are driven. Airflow dust flowing into the housing 2 from the suction port 2a is collected by the filter 23, flows through the suction duct 23 as shown by an arrow A1, and is guided to the blower fan 30 from the suction port 30b. A part of the airflow flows through the passages 50a and 50b outside the duct member 32 as indicated by an arrow A2, and is guided to the blower fan 30 from the intake port 30c.

  The airflow sent from the exhaust port 30d of the blower fan 30 ascends the first blowout duct 21 as shown by an arrow B1 (see FIG. 5). At this time, ions generated by the ion generating element 40 are included in the airflow. The air stream containing ions flows into the second outlet duct 22 through the communication port 25b, rises as shown by an arrow B2 (see FIG. 5), and is sent out radially from the outlet 8 as shown by an arrow B3.

  At this time, the airflow flows into the second blowout duct 22 from the communication port 25b disposed in the front portion of the housing 2, and the airflow is guided forward by the wind direction variable portion 25c. Moreover, the flow path width of the front part between the 2nd blowing duct 22 and the wind direction board 10 is expanded by the recessed part 22b. As a result, more airflow than the surroundings is sent to the front of the blower 1.

  Therefore, many air currents containing ions are sent toward the head of the user facing the front front of the blower 1, and the user can be refreshed and sterilized in the vicinity of the user. Moreover, surrounding sterilization, air circulation, etc. can be performed with the airflow containing the ion sent to the side and the back of the air blower 1.

  Further, the light guided through the light guide plate 25 by driving the LED 26 is emitted toward the air outlet 2 b and is reflected radially by the lower surface 10 a of the wind direction plate 10. Thereby, the indirect illumination around the air blower 1 can be performed. At this time, the light emitted from the front portion of the light guide plate 25 is reduced by the communication port 25b. For this reason, the glare of the user who faced the front front of the air blower 1 can be reduced. Further, since the communication port 25b is disposed on the opposite side of the incident surface 25a with respect to the shaft portion 17, light emitted from the front portion of the light guide plate 25 can be further reduced.

  According to the present embodiment, the suction duct 20 that guides the airflow from the suction port 2a to the intake port 30b and the passages 50a and 50b that guide the airflow to the intake port 30c through the opening 32b facing the top of the circuit board 34 (auxiliary suction) Route), and the airflow flows from below to above along the circuit board 34 in the passage 50b. Thereby, the circuit board 34 can be cooled from the lower part to the upper part by the airflow rising toward the opening 32b. Therefore, it is possible to reduce the size of the blower 1 by reducing the heat radiation space in the housing 2 of the circuit board 34.

  In addition, the blower fan 30 is configured as a double-sided suction type that sucks airflow from both sides in the axial direction via a plurality of paths (20, 50a, 50b). For this reason, it is possible to improve the air blowing efficiency as compared with the single-sided suction type air blowing fan, and it is possible to prevent an uneven flow rate in the axial direction and send a uniform air flow.

  In addition, an opening 32b having an opening area smaller than that of the intake port 30c is opened on a stepped portion 32e formed at a higher portion of the fan holding portion 32a (partition wall) than the lower portion thereof from the intake port 30c. Thereby, the flow path below the passage 50b into which the airflow is bent and flows from the passage 50a can be secured widely. In addition, since the air inlet 30c and the duct holding portion 32a are separated by the step portion 32e, the airflow can be diffused from the small diameter opening 32b and guided to the large diameter air intake 30c. Accordingly, the air blowing efficiency can be further improved.

  Further, a chamfer 32c is provided at the lower end of one side wall (back side) adjacent to the duct holding portion 32a (partition wall) facing the suction port 2a, and a passage 50a (auxiliary suction path) is formed between the outer surface of the chamfer 32c and the housing 2. ) Is formed. Therefore, the passage 50a that guides the airflow to the intake port 30c can be easily realized.

  Further, since the pair of discharge electrodes 41 that discharge positive ions and negative ions to the first blowing duct 21 are arranged side by side in the axial direction of the blower fan 30, positive ions and negative ions are uniformly distributed in the airflow that circulates uniformly in the axial direction. Can be included. Therefore, the bactericidal effect and deodorizing effect by sending out ions can be improved.

  In the present embodiment, the ion generating element 40 sends out an air stream containing ions combined with moisture in the air, but other charged particles may be sent out. For example, charged fine particle water may be sent out as charged particles. Specifically, charged fine particle water containing a radical component can be generated by an electrostatic atomizer. That is, condensed water is generated on the surface of the discharge electrode by cooling the discharge electrode provided in the electrostatic atomizer with a Peltier element. When a negative high voltage is applied to the discharge electrode, charged fine particle water is generated from the dew condensation water.

  INDUSTRIAL APPLICABILITY The present invention can be used for a tabletop air blower equipped with a centrifugal fan.

DESCRIPTION OF SYMBOLS 1 Blower 2 Case 2a Suction port 2b Blowout port 3 Bottom plate 3a Insertion hole 4 Rubber leg 5 Power cord 6 Plug 8 Outflow part 10 Wind direction plate 11 Sleeve 12 Engagement member 16 Compression spring 17 Shaft part 18 Power switch 20 Suction duct 21 1st blowing duct 22 2nd blowing duct 22b Concave part 23 Filter 25 Light guide plate 25a Incident surface 25b Communication port 25c Wind direction variable part 26 LED
DESCRIPTION OF SYMBOLS 30 Air blower 30a Casing 30b, 30c Intake port 30d Exhaust port 32 Duct member 32a Fan holding part 32b Opening part 32e Step part 34 Circuit board 35 Terminal part 40 Ion generating element 41 Discharge electrode 42 Terminal part 45 Holding member 45a Bending part 50a, 50b passage

Claims (4)

  A casing that opens the suction port and the blowout port, and a centrifugal fan that is installed in the axial direction and is covered by the casing, and a first intake port that faces the suction port is opened on one axial surface of the casing. A blower fan having a second air inlet opening on the other surface, a circuit board erected in the housing, and a partition wall that isolates the air fan and the circuit board and faces the second air inlet A suction duct that connects the suction port and the first suction port, and an auxiliary suction path that guides the air flow from the suction port to the second suction port through the opening, and the air flow in the auxiliary suction path Circulates from below to above along the circuit board, and the opening faces the top of the circuit board.   The step part which leaves | separates from a 2nd inlet port rather than the lower part is provided in the upper part of the said partition, The said opening part has an opening area smaller than a 2nd inlet port, It opens on the said step part. The blower according to 1.   A box-shaped duct member that forms the suction duct facing the opening surface of the suction port is formed, the partition wall is formed by a wall surface facing the suction port of the duct member, and the auxiliary suction path is formed in the partition wall. The blower according to claim 1 or 2, wherein the blower is formed between a chamfered outer surface provided at a lower end of one adjacent side wall and the housing.   A blower duct connecting the blower fan and the blower outlet, and a pair of discharge electrodes that discharge positively charged particles and negatively charged particles to the blower duct, the discharge electrodes being arranged in the axial direction of the blower fan The air blower according to any one of claims 1 to 3, wherein the air blower is arranged in parallel.

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