Blower
A blower with the improved P-Q characteristics is provided. A blower comprising a shaft rotatably supported in a tubular casing, a cup shaped motor yoke 11 fixed to the shaft, and a body portion 15 of an impeller 14 comprising a large number of blades 13 on an outer peripheral portion is fixed to the motor yoke 11, wherein the blower is characterized in that substantially ring-like openings 15b are provided at a portion where the blades 13 of the body portion 15 are mounted and on a circumference around the shaft. Since air flow is facilitated by the openings 15b, the P-Q (pressure—flow rate) characteristics are improved.
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This is one of two (2) reissue applications directed to various aspects of a blower described in U.S. Pat. No. 6,368,081, which corresponds to U.S. patent application Ser. No. 09/603,973 filed Jun. 26, 2000. The first filed reissue application is the present application, application Ser. No. 10/807,229, filed Mar. 23, 2004. The second reissue application is application Ser. No. 11/131,769, filed May 18, 2005, which is a continuation of said application Ser. No. 10/807,229, filed Mar. 23, 2004(and, as noted above, which is a reissue of U.S. Pat. No. 6,368,081, which corresponds to U.S. patent application Ser. No. 09/603,973 filed Jun. 26, 2000).
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates to an improvement of a blower for use in various kinds of office automation apparatus.
2. Description of the Related Art
In various kinds of office automation apparatus, since a large number of electronic circuits are housed in a box of the apparatuses, it is difficult to discharge heat generated by electronic components forming the electronic circuits, and thus, there is a fear that a part of the electronic components may be broken or deteriorated. In particular, in the context of the recent trend toward miniaturization of office automation apparatuses, since the apparatuses are miniaturized while the quantity of heat generated almost remains the same, how to deal with the heat is an important technical problem to be solved. In order to solve the problem, an air vent for attaching a blower therein is provided in a side wall of an apparatus to discharge the heat inside to the outside of the apparatus, thereby preventing damage due to the heat generated inside.
An example of a conventionally often used blower is described with reference to FIG. 3. Sign 1 shows a casing which is tubular. An integrally molded housing 2 is provided on the right in
Knurl 8 is provided on the upper end of the shaft 6, and is fixed to a boss 9 formed by die casting zinc. Springs 10 are provided between the boss 9 and the inner race of the bearing 4 for providing thrust load on the bearing 4. A center portion of a cup-like motor yoke 11 is fixed to the boss 9. On the boss 9, the central portion of a cup shaped yoke 11 is fixed, and on the inner peripheral portion, a ring shaped magnet 12 is fixed. A body portion 15 of an impeller 14 provided with blades 13 is fixed to the outer peripheral portion of the motor yoke 11. The shaft 6, the motor yoke 11 and the impeller 14 form a rotating portion.
A stater core 17 around which a stator winding 16 is wound, is provided in the inner peripheral portion of the motor yoke 11 to form a fixed portion. A pin-like connection terminal 18 is provided in a projected manner from the stator core 17 downwardly to pierce a PC board 19 supported by the housing 2. An electronic circuit is mounted on the PC board 19 for controlling the current to be supplied to the stator winding 16.
The blower structured as described above is used by mounting on an air vent in a box of an office automation apparatus. The blower is attached such that the top in
The required characteristics of a blower of this kind is represented as the relationship between the pressure P and the flowing rate Q, i.e., the P-Q characteristics. Among blowers of a given size, one with a high air flow pressure and with a large amount of air flow is determined to be one with satisfactory P-Q characteristics. When circumstances do not allow the blower to be larger and still the P-Q characteristics have to be improved, the improvement can be attained by increasing the number of rotations. However, there is a problem that merely increasing the number of rotations not only increases the noise when the blower is in operation but also shortens the lifetime of the blower.
SUMMARY OF THE INVENTIONThe present invention has been made in view of the above, and an object of the invention is to provide a blower suitable for use in severe circumstances.
In order to solve the above-mentioned problems, according to a first aspect of the present invention, there is provided a blower in which a shaft is rotatably supported in a tubular casing, a cup shaped motor yoke is fixed to the shaft, and a body portion of an impeller comprising a large number of blades on an outer peripheral portion is fixed to the motor yoke, characterized in that substantially ring-like openings are provided at a portion where the blades of the body portion are mounted and on a circumference around the shaft.
According to a second aspect of the present invention, in the blower as described in the first aspect of the present invention, it is characterized in that the openings substantially form a long opening in an arc along the direction of the arrangement of the large number of blades.
In a blower structured as mentioned in the above, when the impeller is rotating, air flows through the openings provided according to the present invention.
In the accompanying drawings:
An embodiment of the present invention is now described with reference to
When the blower according to the present invention with the openings 15b provided at the portion where the blades 13 of the body portion 15 are mounted (in the radially extended portion 15a) is in operation, since the blades 13 suck air from the openings 15b provided adjacent thereto, better air flowing can be obtained compared with a case where a conventional blower with no such openings (see FIGS. 4 and 5).
Tables shown in
A blower according to the first aspect of the present invention has a simple structure only with the openings provided at a portion where the blades of the body portion are attached, and thus,, the P-Q characteristics can be improved without making the blower larger. Further, a blower according to the second aspect of the present invention defining the position and the shape of the openings can enhance the above effect.
Claims
1. A blower comprising
- a shaft which is supported rotatably in a tubular casing,
- a cup shaped motor yoke fixed to said shaft, wherein the shaft extends from a closed end of the cup shaped motor yoke to an open end of the cup shaped motor yoke, and
- a body portion of an impeller comprising a plurality of blades on an outer peripheral portion fixed to said motor yoke, wherein substantially ring-like openings are provided in the body portion at a mounting portion where said plurality of blades are mounted and on a circumference of a circle around said shaft, and wherein the mounting portion is located substantially adjacent, in a radially outward direction, the open end of the cup shaped motor yoke.
2. A blower according to claim 1, wherein said openings substantially form a long opening in an arc extending along the direction of the arrangement of said plurality of blades.
3. A blower according to claim 1, wherein the openings in the mounting portion are substantially annular.
4. A blower comprising
- a casing comprising a first portion having a circular space that accommodates a body portion of the blower therein and a second portion that joins to the first portion and includes an air inlet opening therein, wherein the casing further includes an outlet for air discharge;
- the body portion comprising an impeller and having a cup shaped hub with a closed end and an open end, a plurality of blades peripherally surrounding the cup shaped hub being supported on a blades-mounting portion of the body portion; and
- a driving motor, wherein the body portion is rotated by the driving motor, wherein the blades-mounting portion lies substantially adjacent, outwardly in a radial direction, the open end of the cup shaped hub, and wherein the blades-mounting portion includes openings therein.
5. A blower according to claim 4, further including a motor yoke fixed inside the cup shaped hub of the body portion.
6. A blower according to claim 4, wherein the first portion of the casing includes no air inlets therein such that the air inlet in the second portion of the casing is the only air inlet for the blower.
7. A blower according to claim 4, wherein the openings in the blades-mounting portion are substantially annular.
8. A blower according to claim 4, wherein the outlet for air discharge in the casing comprises an opening in a side of the casing radial to the plurality of blades.
9. A blower comprising
- a casing comprising a first portion having a circular space that accommodates a body portion of the blower therein and a second portion that joins to the first portion and includes an air inlet opening therein, wherein the casing further includes an outlet for air discharge;
- the body portion comprising an impeller and having a cup shaped hub with a closed end and an open end, a plurality of blades peripherally surrounding the cup shaped hub being supported on a blades-mounting portion of the body portion; and
- a driving motor, wherein the body portion is rotated by the driving motor, wherein the blades-mounting portion is located at a side of the casing adjacent a bottom of the circular space of the first portion, and opposite the second portion, and
- wherein the blades-mounting portion includes openings therein.
10. A blower according to claim 9, further including a motor yoke fixed inside the cup shaped hub of the body portion.
11. A blower according to claim 9, wherein the first portion of the casing includes no air inlets therein such that the air inlet in the second portion of the casing is the only air inlet for the blower.
12. A blower according to claim 9, wherein the openings in the blades-mounting portion are substantially annular.
13. A blower according to claim 9, wherein the outlet for air discharge in the casing comprises an opening in a side of the casing radial to the plurality of blades.
14. A blower comprising
- a casing comprising a first portion having a circular space that accommodates a body portion of the blower therein and a second portion that joins to the first portion and includes an air inlet opening therein, wherein the casing further includes an outlet for air discharge;
- the body portion comprising an impeller and having a cup shaped hub with a closed end and an open end, a plurality of blades peripherally surrounding the cup shaped hub being supported on a blades-mounting portion of the body portion; and
- a driving motor, wherein the body portion is rotated by the driving motor, wherein the first portion of the casing further includes a base having a protruding cylindrical portion that accommodates a bearing tube, wherein the blades-mounting portion is substantially adjacent, outwardly in a radial direction, the protruding cylindrical portion, and wherein the blades-mounting portion includes openings therein.
15. A blower according to claim 14, further including a motor yoke fixed inside the cup shaped hub of the body portion.
16. A blower according to claim 14, wherein the first portion of the casing includes no air inlets therein such that the air inlet in the second portion of the casing is the only air inlet for the blower.
17. A blower according to claim 14, wherein the openings in the blades-mounting portion are substantially annular.
18. A blower according to claim 14, wherein the outlet for air discharge in the casing comprises an opening in a side of the casing radial to the plurality of blades.
19. A blower comprising
- a casing comprising a first portion having a circular space that accommodates a body portion of the blower therein and a second portion that joins to the first portion and includes an air inlet opening therein, wherein the casing further includes an outlet for air discharge;
- the body portion comprising an impeller and having a cup shaped hub with a closed end and an open end, a plurality of blades peripherally surrounding the cup shaped hub being supported on a blades-mounting portion of the body portion; and
- a driving motor, wherein the body portion is rotated by the driving motor, wherein the blades-mounting portion includes openings therein, and wherein the first portion of the casing includes no air inlets therein such that the air inlet in the second portion of the casing is the only air inlet for the blower.
20. A blower according to claim 19, wherein the outlet for air discharge in the casing comprises an opening in a side of the casing radial to the plurality of blades.
21. A blower comprising
- a casing comprising a first portion having a circular space that accommodates a body portion of the blower therein and a second portion that joins to the first portion and includes an air inlet opening therein, wherein the casing further includes an outlet for air discharge;
- the body portion comprising an impeller and having a cup shaped hub with a closed end and an open end, a plurality of blades peripherally surrounding the cup shaped hub being supported on a blades-mounting portion of the body portion, wherein the blades-mounting portion includes openings therein; and
- a driving motor, wherein the body portion is rotated by the driving motor, and wherein the air inlet opening in the second portion of the casing and the closed end of the cup shaped hub together form a continuous annular air inlet passageway.
22. A blower according to claim 21, wherein the outlet for air discharge in the casing comprises an opening in a side of the casing radial to the plurality of blades.
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Type: Grant
Filed: Mar 23, 2004
Date of Patent: Jun 6, 2006
Assignee: Minebea Co., Ltd. (Nagano)
Inventor: Kaoru Matsumoto (Nagano-ken)
Primary Examiner: Cheryl Tyler
Assistant Examiner: William H. Rodriguez
Attorney: Oliff & Berridge, PLC
Application Number: 10/807,229
International Classification: F04B 17/00 (20060101);