Blowing apparatus

Patent metadata

Field	Value
Publication number	US-10982679-B2
Application number	US-201815898761-A
Country	US
Kind code	B2
Filing date	Feb 19, 2018
Priority date	Aug 18, 2015
Publication date	Apr 20, 2021
Grant date	Apr 20, 2021

Abstract

A blowing apparatus includes a blowing unit, a first circuit board, a second circuit board, a top casing, a middle casing, and a bottom casing. The bottom casing has an intake hole. The middle casing has a nozzle to which a tube is attached, and also has an exhaust hole inside the nozzle. The exhaust hole is connected to a mask, with the tube interposed therebetween. The blowing unit includes a fan and a motor configured to rotate the fan. The blowing unit is located in a region between the first circuit board and the second circuit board. The first circuit board intersects a rotation axis of the fan. The first circuit board covers the blowing unit as viewed from the top casing in plan view of the first circuit board.

First claim

The invention claimed is:

1. A blowing apparatus comprising:
a blowing unit including a fan and a motor configured to rotate the fan;
a first circuit board having a control circuit mounted thereon, the control circuit being configured to control drive of the motor, the first circuit board intersecting a rotation axis of the fan; and
a casing having an intake hole and an exhaust hole, the casing housing the blowing unit and the first circuit board; and
a second circuit board intersecting the rotation axis of the fan and housed in the casing,
wherein the first circuit board overlaps with the blowing unit in a plan view of the first circuit board, and
wherein the second circuit board is located under the blowing unit, and overlaps with a whole area of the blowing unit in a plan view of the second circuit board.

2. The blowing apparatus according to claim 1 ,
wherein the blowing unit is located in a region between the first circuit board and the second circuit board.

3. The blowing apparatus according to claim 2 , wherein the casing has a securing portion configured to secure the first circuit board; and
the first circuit board and the securing portion are bonded together with an elastic member interposed between the first circuit board and the securing portion.

4. The blowing apparatus according to claim 2 , wherein the control circuit includes a filter circuit configured to attenuate signals in a specific band.

5. The blowing apparatus according to claim 2 , further comprising:
a microphone configured to detect a first sound produced by the blowing unit; and
a sound absorbing speaker configured to produce a second sound having a phase opposite to a phase of the first sound detected by the microphone,
wherein the sound absorbing speaker is housed in the casing while facing toward the intake hole.

6. The blowing apparatus according to claim 1 , wherein the casing has a securing portion configured to secure the first circuit board; and
the first circuit board and the securing portion are bonded together with an elastic member interposed between the first circuit board and the securing portion.

7. The blowing apparatus according to claim 6 , wherein the control circuit includes a filter circuit configured to attenuate signals in a specific band.

8. The blowing apparatus according to claim 1 , wherein the control circuit includes a filter circuit configured to attenuate signals in a specific band.

9. The blowing apparatus according to claim 8 , further comprising a sensor configured to detect a frequency of sound or vibration produced by the drive of the motor,
wherein the control circuit is configured to set the specific band to be attenuated by the filter circuit based on a detection result outputted by the sensor.

10. The blowing apparatus according to claim 1 , further comprising:
a microphone configured to detect a first sound produced by the blowing unit; and
a sound absorbing speaker configured to produce a second sound having a phase opposite to a phase of the first sound detected by the microphone,
wherein the sound absorbing speaker is housed in the casing while facing toward the intake hole.

11. The blowing apparatus according to claim 1 , wherein the fan includes a plurality of blades extending radially with respect to the rotation axis;
the exhaust hole is located outside a perimeter of the plurality of blades with respect to the rotation axis; and
a diameter of the exhaust hole is greater than a length of each of the blades in a direction parallel to the rotation axis.

12. The blowing apparatus according to claim 1 , wherein the first circuit board overlaps with a whole area of the blowing unit in a plan view of the first circuit board, and the first circuit board is located above the fan.

13. The blowing apparatus according to claim 1 , wherein the motor is located between the fan and the first circuit board.

Assignees

• Murata Manufacturing Co

Inventors

• Higashiyama Yuzo
• Tsuji Shigeru

Classifications

• F04D29/4226

  Fan casings · CPC title

• A61M16/0875

  Connecting tubes · CPC title

• A61M16/105

  Filters (A61M16/047, A61M16/22 take precedence; water traps A61M16/08) · CPC title

• A61M2016/0027

  pressure meter · CPC title

• F04D27/004

  by varying driving speed · CPC title