Title:
Blower fan with two heads
Kind Code:
A1


Abstract:
A blower fan with two heads has an upper shell, a lower shell, a plate, and a motor. Two air passages are formed between the upper shell and the lower shell due to the plate being mounted between them so that the present invention is compact and the manufacture cost is effective.



Inventors:
Wang, Sheng-chien (Taichung Hsien, TW)
Application Number:
11/108680
Publication Date:
11/23/2006
Filing Date:
04/19/2005
Primary Class:
International Classes:
F04D29/44
View Patent Images:
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Primary Examiner:
NGUYEN, NINH H
Attorney, Agent or Firm:
BACON & THOMAS, PLLC (Alexandria, VA, US)
Claims:
What is claimed is:

1. A blower fan with two heads comprising: an upper shell (10) having a ceiling (11), multiple air inlets (12) respectively defined in the ceiling (11), a first rim (13) downwardly formed on a periphery of the ceiling (11), a first lug (111) integrally formed on an edge of and parallel to the ceiling (11), and multiple air outlets (15) respectively defined under the first lug (111); a lower shell (60) having a flat (61), a second rim (62) upwardly formed on a periphery of the flat (61), a second lug (611) integrally formed on an edge of an parallel to the flat (61), multiple air ports (64) respectively defined under the second lug (611), a wall (65) mounted under an interior of the flat (61) and covered with a base (66) to form a chamber (68), multiple air entries (37) defined in the base (66); a plate (30) provided between the upper shell (10) and the lower shell (60) and mounted with a bearing seat (31), a bearing (34) mounted on the bearing seat (31), whereby the upper shell (10) and the lower shell (60) are respectively sealed by the plate (30) thereby forming two air passages; and a motor (50) provided between the upper shell (10) and the lower shell (60) and having an axle (51), an impeller (20) mounted on a top end of the axle (51) and received into the upper shell (10) due to the axle (51) being inserted into the bearing (34) upwards, and a vane wheel (40) mounted on a lower end of the axle (51) and received into the lower shell (60) and mounted on the plate (30).

2. The blower fan with two heads as claimed in claim 1, wherein a protrusion (65) is formed on the wall (65), as least one aperture (652) is defined in the protrusion (65) whereby wires are inserted into the chamber (38) through the apertures (652) to electrically connect to the motor (50).

3. The blower fan with two heads as claimed in claim 2, wherein a circular channel (511) is defined in a distal end of the axle (51) to be mated with a ring (35).

4. The blower fan with two heads as claimed in claim 1, wherein the plate (30) has multiple orifices (301) defined in a periphery thereof, and multiple fingers (32), each of which has a through hole defined in a center of the finger (32), defined in an edge of the plate (30).

5. The blower fan with two heads as claimed in claim 4, wherein a first and a second slat (33, 33a) are integrally formed on two edges of the plate (30), the first slat (33) corresponding to the first lug (111) whereby the first lug (111) can be covered and sealed, and the second slat (33a) is relative to the second lug (611) whereby the second lug (611) can be covered and sealed.

6. The blower fan with two heads as claimed in claim 5, wherein the first and the second slats (33, 33a), parallel to each other, extend in an opposed direction.

7. The blower fan with two heads as claimed in claim 5, wherein multiple bars (63), each of which has a through opening, are respectively mounted on a top outer wall of the second rim (62) whereby screws can be inserted into the orifices (301) and the corresponding bars (63) thereby engaging the plate (30) with the lower shell (60).

8. The blower fan with two heads as claimed in claim 5, wherein multiple rods (14), each of which has a groove, are respectively mounted on a lower outer wall of the first rim (13) whereby screws can be inserted into the fingers (32) and the corresponding rods (14) thereby engaging the plate (30) with the upper shell (10).

9. The blower fan with two heads as claimed in claim 5, wherein the first slat (33) is perpendicular to the second slat (33a).

Description:

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a blower fan with two heads, and more particularly to such a blower fan which is compact.

2. Description of Related Art

With reference to FIGS. 6-7, a conventional blower fan with two heads has an upper shell (70), a middle shell (80), and a lower shell (90), wherein the middle shell (80) is formed between the upper shell (70) and the lower shell (90). The upper shell (70) has a first ceiling (71) on a top thereof, and multiple first air inlets (72) extending in a radiant direction are defined in the first ceiling (71). A first wall (not numbered) is integrally formed downwards and around the upper shell (70), and a lug (711) is formed on a periphery of and parallel to the first ceiling (71). Multiple first air outlets (73), each parallel to each other, are uprightly defined under the lug (711). A second ceiling (83) is provided between the upper shell (70) and the middle shell (80) and a motor (81) which has an axle (82) extending out thereof, is received in the middle shell (80). The lower shell (90) has a floor formed under thereof, and multiple second air inlets (92) are respectively defined in the floor in a radiant direction. A circular rim (95) is upright formed around the second air inlets (92) and a second wall (not numbered) is upwards formed around a periphery of the lower shell (90). A second lug (911) is integrally formed on and parallel to the lower shell (90) and multiple second air outlets (94) are respectively defined under the second lug (911). A third ceiling (93) is mounted on a top side of the lower shell (90) so that two ends of the axle (82) can be respectively inserted into the upper and lower shells (70, 90) and two impellers (84, 85), which are respectively mounted on the two ends of the axle (82), can be received into the upper and lower shells (70, 90). Hence, the impellers (84, 85), which are driven by the motor (81), rotate to draw air into the upper and lower shells (70, 90) through the first air inlets (72) and the second air inlets (92) and to expel the air out of the first air outlets (73) and the second air outlets (94).

However, the conventional blower fan with two heads occupies too much space due to the two impellers (84, 85). Furthermore, the second ceiling (83) and the third ceiling (93) are provided to seal the lower and upper shells (90, 70) thereby increasing the manufacture cost and the production time.

Therefore, the invention provides a blower fan with two heads to mitigate or obviate the aforementioned problems.

SUMMARY OF THE INVENTION

The main objective of the present invention is to provide a blower fan with two heads that is compact and economic in manufacture cost.

Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded perspective view of a first preferred embodiment of a blower fan with two heads in accordance with the present invention;

FIG. 2 is a perspective view of the first preferred embodiment of the blower fan with two heads in accordance with the present invention;

FIG. 3 is a top view of the first preferred embodiment of the blower fan with two heads in accordance with the present invention;

FIG. 4 is a sectional view of the first preferred embodiment of the blower fan with two heads in accordance with the present invention;

FIG. 5 is a perspective view of a second preferred embodiment of a blower fan with two heads in accordance with present invention;

FIG. 6 is a perspective view of a conventional blower fan with two heads; and

FIG. 7 is a sectional view of the conventional blower fan with two heads.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

With reference to FIGS. 1-4, a first preferred embodiment of a blower fan with two heads comprises an upper shell (10), a plate (30), a motor (50), and a lower shell (60). The upper shell (10) is composed of a ceiling (11) formed on a top side thereof, and a first downward rim (13) provided on a periphery of the ceiling (11). Multiple air inlets (12) are respectively defined in a center of the ceiling (11) in a radiant direction. A first lug (111) is integrally formed on an edge of and parallel to the ceiling (111) and multiple air outlets (15), parallel to each other, are respectively vertically under the first lug (111).

The lower shell (60) has a flat (61) formed in a center thereof, an upward rim (62) formed on a periphery of the flat (61), and a downward wall (65) formed in an interior of the flat (61). A second lug (611) is integrally formed on an edge of and parallel to the flat (61), and multiple air ports (64), parallel to each other, are vertically defined under the second lug (611). A base (66), perpendicular to the wall (65), is provided under the wall (65) to form a chamber (68), and multiple air entries (67) are respectively defined in a center of the base (66) in a radiant direction.

The plate (30), which is securely provided between the upper and lower shells (10, 60), seals them to form two air passages. A bearing seat (31), in which a bearing (34) is provided, is mounted in a center of the plate (30).

The motor (50), which is received between the upper and lower shells (10, 60), has an axle (51) in a center thereof. An impeller (20) is mounted on a top end of the axle (51) through a central hole (21) thereof, wherein the bearing (34) is inserted into the hole (21), so that the impeller (20) can be received into the upper shell (10). A vane wheel (40), which is mounted on a lower end of the axle (51) through a central opening (41) thereof, is received into the lower shell (60) and mounted on the flat (61). A protrusion (651) is formed on a lateral side of the wall (65) and two apertures (652) are defined in the protrusion (651) so that a wire can be inserted into the chamber (68) to electrically connect to the motor (50) through the apertures (652).

A circular channel (511) is defined in a distal end of the axle (51) so that the impeller (40) can be fastened on the axle (51) due to a ring (35) such as a C-clip, being mated with circular channel (511) when the axle (51) is inserted into the vane wheel (40), the plate (30) and the impeller (20) in turn.

Multiple orifices (301) are respectively defined on a periphery of the plate (30), and multiple fingers (32), each of which has a through hole, are respectively formed on an edge of the plate (30). A first slat and a second slat (33, 33a) are integrally formed on two opposed edges of the plate (30) so that the first slat and the second slat (33, 33a), parallel to each other, extend in opposed directions. The first slat (33) corresponds to the first lug (111) so that the first lug (111) can be covered and sealed while the second slat (33a) is relative to the second lug (611) so that the second lug (611) can be covered and sealed.

Multiple bars (63), each of which has a through opening, are respectively formed on a top outer wall of the second rim (62). When the lower shell (60) is covered with the plate (30), screws can be inserted into the orifices (301) and the corresponding bars (63) thereby engaging the plate (30) with the lower shell (60).

Multiple rods (14), each of which has a groove, are respectively formed on a lower outer wall of the first rim (13). When the upper shell (10) is covered with the plate (30), screws can be inserted into the fingers (32) and the corresponding rods (14) thereby engaging the plate (30) with the upper shell (10).

With reference to FIG. 4, the impeller (20) and the vane wheel (40) are driven to rotate by the axle (51) when the motor (50) operates, so that air can enter the upper and the lower shell (10, 60) through the air inlets (12) and the air entries (67) and blow the air out of the air outlets (15) and the air ports (64).

With reference to FIG. 5, a second preferred embodiment of the blower fan with two heads is similar to the first preferred embodiment, except that the first slat and the second slat (33, 33a) are perpendicular to each other.

Hence, advantages of the blower fan with two heads are described as follow:

1. The present invention only has the upper shell and the lower shell and thereby is compact.

2. The plate (30) seals the upper shell and the lower shell to form two air passages thereby achieving effective manufacture cost of the present invention.

It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.