Patent Application
20060165525
The invention relates to a blower, and in particular to a blower preventing an air leakage and increasing an air pressure.
Blowers are often employed to provide high air pressure to a system requiring high backpressure. In
Usually, the profile of the first inlets 14 and the second inlet 11 is circle and are concentric with the impeller 16. The first and the second housings 12a and 12b cover the rounded region 100, to produce airflow. The first inlets 14 and the second inlet 11, however, are not covered by the first and the second housings 12a and 12b, allowing an airflow, leakage via the first inlets 14 and the second 11 when the impeller 16 is rotated at high speed, resulting in reduced pressure.
The invention provides a blower comprising a housing and an impeller, wherein the impeller disposed in the housing. The housing includes a side outlet and an inlet with a predetermined profile. The predetermined profile is quadratrical, elliptical, polygonal, non-coaxial circle, or irregularly closed shaped. A flow tunnel is disposed between the impeller and the housing.
The invention further provides a main inlet and a secondary inlet, wherein the secondary inlet extends outwardly from the periphery of the main inlet. The housing further comprises a plurality of outer frames assembled by coupling, riveting, engaging, or adhesion.
The invention employs the inlets in different positions with varied shapes to cover an extended flow tunnel toward the blades of the impeller, to prevent an airflow leakage via the inlets when the impeller is rotated at high speed and maintain airflow pressure.
The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:
In
The housing 102 comprises a first frame 102a, a second frame 102b, a first inlet 104, a second inlet 112 and a side outlet 114. The first frame 102a and the second frame 102b are assembled by coupling, riveting, engaging, or adhesion.
The first inlet 104 formed on the first frames 102a, comprises a first quadratrical predetermined profile and the second inlet 112 formed on the outer frames 102b comprises a second predetermined profile. In the preferred embodiment, the predetermined profile of the first inlet 104 can be elliptical (symbol “106a” in
The housing 102 is made from plastic, metal or a composite material and is formed by injection, moldings, pressing, cutting or integrally formed as a single unit.
The impeller 108 comprises a plurality of blades 116 and a driving device (not shown in Figs.) to rotate the blades 116. An inflow area 110 is encircled by the outer periphery of the blades 116 of the impeller 108. The flow tunnel 118 between the impeller 108 and the housing 102 extends along an axial aspect of the impeller 108 and the housing 102.
The profile of the first and second inlets 104 and 112 do not corresponded to the inflow area 110 of the impeller 108, i.e., the housing 102 partially covers the inflow area 110′. In other embodiments, the first inlet 104 can expose partially or none of the inflow area 110.
When a working fluid, e.g. an air, passes along the flow tunnel 118, the majority of the working fluid is blocked by the housing 102 and is contained in the flow tunnel 118, thus increasing the rotational speed of the impeller 108 and getting a higher air pressure and a better performance.
Note that the number of the first and second inlets 104 and 112 of the housing 102 is not limited to that of the disclosed embodiments. The number of the inlet of the housing 102 can be one or more than two.
In
One side of the housing 102′ comprises a main inlet 204, an outlet 214, and a secondary inlet 215 extending outwardly from the periphery of the main inlet 204. The main inlet 204 exposes partially or none of the inflow area and the secondary inlet increases an exposed zone of the inflow area.
The impeller 208 comprises a plurality of blades 216, and an inflow area 110 is encircled by the outer periphery of the blades 216 of the impeller 208.
Based on the invention, the flow tunnel 218 can be divided into a high-pressure zone 220, ranging from a narrowest part of the flow tunnel 218 to a designated part thereof, and a low-pressure zone 221 of the flow tunnel 218 that approaches the outlet 214. The designated part generally is determined according to the desired requirement. That is to say, the secondary inlet 215 approaches the outlet 214 and the low-pressure zone 221.
The outer diameter of the main inlet 204 is partially smaller than that of the impeller 208. With the secondary inlet 215, an exposed zone corresponding to the inflow area 110′ can be increased.
Note that the secondary inlet 215 located at the low-pressure zone 221 and extends outwardly from the periphery of the axial main inlet 204 to increase the quantity of the inlet.
In
In the preferred embodiment, the profile of the main inlet 204 can be circular, quadratrical, involute, elliptical, polygonal, eccentrically circular, irregularly closed shaped such as the protrusion 222, regular, or irregular. The profile of the secondary inlet 215 can be regular or irregular.
Based on the described embodiments, the amount of the intake air in the flow tunnel can be increased by utilization of different sizes, shapes or positions of the inlets. When the blower is operated, the majority of working fluid is limited within the flow tunnel, thus increasing the rotational speed of the impeller, maintaining a higher working pressure and a better performance of the blower.
While the invention has been described with respect to preferred embodiment, it is to be understood that the invention is not limited thereto, but, on the contrary, is intended to accommodate various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 94102459 | Jan 2005 | TW | national |
