Blower fan

Patent metadata

Field	Value
Publication number	US-9599122-B2
Application number	US-201314030633-A
Country	US
Kind code	B2
Filing date	Sep 18, 2013
Priority date	Dec 25, 2012
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

In a blower fan according to a preferred embodiment of the present invention, a side wall portion includes a tongue portion arranged to project between an air outlet and an impeller. A side surface of the tongue portion includes a tongue portion tip arranged to touch a first imaginary plane including a central axis; a first tongue portion side surface arranged to extend from the tongue portion tip along an outer envelope of the impeller; and a second tongue portion side surface arranged to extend from the tongue portion tip toward a side edge, the side edge being a line of intersection of the air outlet and the side wall portion. The second tongue portion side surface is arranged to cross a second imaginary plane including the central axis and touching the side edge.

First claim

What is claimed is:

1. A blower fan comprising:
an impeller centered on a central axis extending in a vertical direction;
a motor portion arranged to rotate the impeller about the central axis; and
a housing arranged to house the impeller; wherein
the housing includes:
a lower plate portion arranged to cover a lower side of the impeller, and arranged to have the motor portion fixed thereto; and
a side wall portion arranged to cover a lateral side of the impeller;

the lower plate portion or an upper plate portion arranged to cover an upper side of the impeller includes an air inlet;
the upper plate portion, the side wall portion, and the lower plate portion are arranged to together define an air channel portion arranged to surround the impeller;
the upper plate portion, the side wall portion, and the lower plate portion are arranged to together define an air outlet on the lateral side of the impeller;
the air outlet is planar and parallel to the central axis, and includes one of an edge of the upper plate portion, a pair of edges of the side wall portion, and an edge of the lower plate portion that is closest to the central axis;
the side wall portion includes a tongue portion arranged to project between the air outlet and the impeller;
a side surface of the tongue portion includes:
a tongue portion tip arranged to touch a first imaginary plane including the central axis;
a first tongue portion side surface arranged to extend from the tongue portion tip along an outer envelope of the impeller; and
a second tongue portion side surface arranged to extend from the tongue portion tip toward a side edge, the side edge being a line of intersection of the air outlet and the side wall portion;

the second tongue portion side surface is arranged to cross a second imaginary plane including the central axis and touching the side edge; and
a closest proximity position, at which the first tongue portion side surface and the outer envelope are in closest proximity to each other, is located between the first imaginary plane and a third imaginary plane including the central axis and touching the second tongue portion side surface between the tongue portion tip and the side edge,
wherein the tongue portion tip is located between the outer envelope and a fourth imaginary plane parallel to the air outlet and touching the outer envelope.

2. The blower fan according to claim 1 , wherein the closest proximity position is located between the first and second imaginary planes.

3. The blower fan according to claim 1 , wherein the air outlet is arranged to have a width greater than a diameter of the outer envelope in a cross-section perpendicular to the central axis.

4. The blower fan according to claim 1 , wherein the second tongue portion side surface is a smooth curved surface.

5. The blower fan according to claim 1 , wherein a shortest distance between the tongue portion tip and a fourth imaginary plane parallel to the air outlet and touching the outer envelope is arranged to be equal to or shorter than a shortest distance between the closest proximity position and the outer envelope.

6. The blower fan according to claim 1 , wherein an angle defined between the first imaginary plane and a fifth imaginary plane including the central axis and parallel to the air outlet is arranged to be greater than 45 degrees and smaller than 90 degrees.

7. The blower fan according to claim 6 , wherein the angle defined between the first and fifth imaginary planes is arranged to be 50 or more degrees and smaller than 90 degrees.

8. The blower fan according to claim 1 , wherein
one of the upper and lower plate portions includes a shoulder portion arranged to traverse an area between the air outlet and the impeller;
a portion of the one of the upper and lower plate portions which extends between the air outlet and the shoulder portion is arranged to be more distant from another one of the upper and lower plate portions in the vertical direction than is a remaining portion of the one of the upper and lower plate portions; and
the shoulder portion includes a first shoulder portion arranged to extend from the second tongue portion side surface toward the outer envelope of the impeller in a plan view.

9. The blower fan according to claim 8 , wherein the shoulder portion further includes a second shoulder portion arranged to extend from an end portion of the first shoulder portion along the outer envelope in a direction away from both the second tongue portion side surface and the air outlet in the plan view, and a third shoulder portion arranged to extend from an end portion of the second shoulder portion to the side wall portion between the central axis and a fourth imaginary plane with respect to a direction perpendicular to the air outlet in the plan view, the fourth imaginary plane being parallel to the air outlet and touching the outer envelope.

10. The blower fan according to claim 1 , wherein the air inlet is arranged to avoid the first imaginary plane.

11. A blower fan comprising:
an impeller centered on a central axis extending in a vertical direction;
a motor portion arranged to rotate the impeller about the central axis; and
a housing arranged to house the impeller; wherein
the housing includes:
a lower plate portion arranged to cover a lower side of the impeller, and arranged to have the motor portion fixed thereto; and
a side wall portion arranged to cover a lateral side of the impeller;

the lower plate portion or an upper plate portion arranged to cover an upper side of the impeller includes an air inlet;
the upper plate portion, the side wall portion, and the lower plate portion are arranged to together define an air channel portion arranged to surround the impeller;
the upper plate portion, the side wall portion, and the lower plate portion are arranged to together define an air outlet on the lateral side of the impeller;
the air outlet is planar and parallel to the central axis, and includes one of an edge of the upper plate portion, a pair of edges of the side wall portion, and an edge of the lower plate portion that is closest to the central axis;
the side wall portion includes a tongue portion arranged to project between the air outlet and the impeller;
a side surface of the tongue portion includes:
a tongue portion tip arranged to touch a first imaginary plane including the central axis;
a first tongue portion side surface arranged to extend from the tongue portion tip along an outer envelope of the impeller; and
a second tongue portion side surface arranged to extend from the tongue portion tip toward a side edge, the side edge being a line of intersection of the air outlet and the side wall portion;

the second tongue portion side surface is arranged to cross a second imaginary plane including the central axis and touching the side edge; and
a closest proximity position, at which the first tongue portion side surface and the outer envelope are in closest proximity to each other, is located between the first and second imaginary planes,
wherein the tongue portion tip is located between the outer envelope and a fourth imaginary plane parallel to the air outlet and touching the outer envelope.

12. The blower fan according to claim 11 , wherein the air outlet is arranged to have a width greater than a diameter of the outer envelope in a cross-section perpendicular to the central axis.

13. The blower fan according to claim 11 , wherein the second tongue portion side surface is a smooth curved surface.

14. The blower fan according to claim 11 , wherein a shortest distance between the tongue portion tip and a fourth

Assignees

• Nidec Corp

Inventors

• Tamaoka Takehito
• Fukushima Kazuhiko
• Horise Kyoko
• Ishigami Shinya
• Nagai Takahiro

Classifications

• F04D25/0613

  the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator · CPC title

• F04D17/16

  for displacing without appreciable compression · CPC title

• F04D29/422 Primary

  Discharge tongues (F04D17/04 takes precedence) · CPC title