CENTRIFUGAL REGENERATIVE BLOWING DEVICE
FIELD OF THE INVENTION
This invention relates to a blowing device and in particular relates to a centrifugal regenerative blowing device.
BACKGROUND
Blowers are extensively employed in applications such as aeration, air combustion, air cooling, air injection, exhaust emission testing, gas exhaustion etc.
In general, regenerative and centrifugal blowers are commonly known blowers owing to their design and performance. Multiple phases of fluid through impeller blades allow the regenerative blower to produce higher pressure ratios. The impeller blades of the regenerative blower produce a series of helical flows. The fluid in regenerative blower housing is returned repeatedly through the impeller blades for additional energy as the fluid passes through an open annular channel in the regenerative blower housing.
Fig. 1 shows a sectional view of the impeller blade 102 of the regenerative blower 100 with the pattern of flow of the fluid around the impeller blade.
The regenerative blowers 100 have the ability to produce high pressure ratios at low mass flow rates. However, the regenerative blowers 100 operate at low mass flow rate due to the smaller cross sectional area for the peripheral flow. Moreover, it is difficult to develop high mass flow rates at high pressure ratios in the regenerative blowers.

Fig. 2 is an illustration of a centrifugal blower 200. Centrifugal blowers 200 are usually used for moderate and high pressure applications. The centrifugal blowers 200 have the ability to produce high mass flow rate. In centrifugal blower 200, the fluid enters axially via an inlet 202 at the center of centrifugal blower casing 204. The impeller 206 of the centrifugal blower 200 delivers the fluid at a high pressure and velocity to the casing 204. This fluid from the impeller 206 is collected in a spiral shaped volute 208. The static pressure of the fluid is further increased in the volute 208.
Although the centrifugal blower 200 can operate efficiently for high pressure applications, it is difficult to obtain high pressure ratios at low mass flow rates in case of the centrifugal blower 200.
The characteristics of both regenerative 100 and centrifugal blowers 200 can be combined together to achieve higher efficiency. Blowers having features of both regenerative and centrifugal blowers are developed. The blowers with these features have plurality of blades functioning as a plurality of regenerative blower blades and a plurality of centrifugal blower blades. Thus, these blowers are two stage blowers and are complex in design.
Thus, there is a need to develop a centrifugal regenerative blower with simplified design and higher efficiency which overcomes the above mentioned problems.
SUMMARY
The present invention discloses a centrifugal regenerative blowing device, which provides both radial and axial entry of fluid into an impeller. The centrifugal regenerative blowing device has a casing with torodial and circular cross section. The casing of the

blowing device has an upper housing and a lower housing. The upper housing of the casing has an axial inlet for the entry of fluid. The casing has a radial outlet for the exit of the fluid. The casing of the centrifugal regenerative blowing device houses an impeller. The impeller comprises of a plurality of blades disposed symmetrically and circumferentially along the periphery of the impeller. The blades are forward curved in the direction of rotation of the impeller. The axial inlet in the upper housing is positioned above the blades of the impeller and covers three-fourth of the length of the blades.
This summary is provided to introduce simplified concepts of a centrifugal regenerative blowing device which are further described below in the detailed description. This summary is not intended to identify essential features of the claimed subject matter, nor is it intended for use in determining the scope of the claimed subject matter.
BRIEF DESCRIPTION OF THE DRAWINGS
The novel features of the invention are set forth in the appended claims hereto. The invention itself, however, as well as a preferred mode of use, further objectives, and advantages thereof, will best be understood by reference to the following detailed description of illustrative embodiments when read in conjunction with the accompanying drawings, wherein the same numbers are used throughout the drawings to reference like features, and wherein:
Fig. 1 shows a sectional view of the impeller blade of a regenerative blower.
Fig. 2 illustrates a centrifugal blower.

Fig. 3 provides an exemplarily three dimensional view of a centrifugal regenerative blowing device.
Fig. 4 exemplarily illustrates an exploded view of centrifugal regenerative blowing device depicting, the major components.
Fig. 5 illustrates a view of the upper housing of the centrifugal regenerative blowing device.
Fig. 6 illustrates a view of the lower housing of the centrifugal regenerative blowing device.
Fig. 7 exemplarily illustrates a detailed view of the lower housing of the centrifugal regenerative blowing device.
Fig. 8 illustrates an example of the flow pattern of the flow of the fluid along the blades of the impeller.
Fig. 9 illustrates a sectional view of the impeller.
DETAILED DESCRIPTION
A centrifugal regenerative blowing device is described in which embodiments are provided for preferred assembling of the various components of the device to obtain improved results. In one exemplary implementation, preprocessing of the input is performed by various subsystems. The various subsystems are deemed correlated and are associated to each other.

The centrifugal regenerative blowing device disclosed herein provides both radial and axial entry of fluid into the impeller of the device. The centrifugal regenerative blowing device comprises a casing, having torodial and circular cross section. The casing has an upper housing and a lower housing. An axial inlet is provided in the upper housing for entry of the fluid. A radial outlet provided in the casing for exit of the fluid. Further, an impeller is housed in the casing. The impeller has a plurality of blades disposed symmetrically and circumferentially along its periphery. The blades are forward curved in the direction of rotation of the impeller. The axial inlet is positioned above the blades of the impeller, covering three-fourth of the length of the blades.
While aspects of described systems and methods for improving the performance of blowing device can be implemented in any number of different mechanical and electrical systems, environments, and/or configurations, embodiments discussed herein are described in the context of the following exemplary system architecture(s) and method(s).
An Exemplary View
Fig. 3 provides an exemplarily three dimensional view of a centrifugal regenerative blowing device 300. The figure shows the exterior of the centrifugal regenerative blowing device. The casing of the centrifugal regenerative blowing device 300 has an axial inlet 302 for entry of fluid and a radial outlet 304 for exit of fluid. The notable feature of the centrifugal regenerative blowing device 300 disclosed herein is that the entry of fluid to the blowing device is through an axial inlet 302 and exit through a

radial outlet 304. However, the fluid enters the impeller 310 of the centrifugal regenerative blowing device 300 in both axial and radial direction simultaneously.
An Exemplary View
Fig. 4 exemplarily illustrates an exploded view of centrifugal regenerative blowing device 300 depicting the major components. The centrifugal regenerative blowing device 300 primarily comprises a casing made up of an upper housing 306 and a lower housing 308 and an impeller 310 housed in the casing. The axial inlet 302 is provided on the upper housing 306. The axial inlet 302 has a parallelogram cross section. A semi circular curved section is provided on both the upper housing 306 and the lower housing 308 to form the radial outlet 304. The upper housing 306 and the lower housing 308 are symmetrical in inner profile but the upper housing 306 has the axial inlet 302 and the lower housing 308 has the mountings for the drive mechanism provided to drive the impeller 310. The upper housing 306 and the lower housing 308 put together, build up the casing that accommodates the impeller 310. The casing also provides a channel for the flow of fluid from the axial inlet 302 to the radial outlet 304.
An Exemplary View
Fig. 5 illustrates a view of the upper housing 306 of the centrifugal regenerative blowing device 300. The figure shows radial outlet 304 carved on the upper housing 306 and an opening 312 provided for axial entry of fluid.

An Exemplary View
Fig. 6 illustrates a view of the lower housing 308 of the centrifugal regenerative blowing device 300. The lower housing 308 of the centrifugal regenerative blowing device 300 houses the impeller 310. A plurality of blades 320 are placed along the periphery of the impeller 310. The blades 320 are forward curved in the direction of rotation of the impeller 310. The blades 320 of the impeller 310 are designed in curved shape to increase the fluid flow area. The blades 320 of the impeller 310 are provided with chamfer on both top and bottom face of the blades 320.
An Exemplary View
Fig. 7 exemplarily illustrates a detailed view of the lower housing 308 of the centrifugal regenerative blowing device 300 without the impeller 310. The figure shows the radial outlet 304 and the holes provided for the drive mechanism used to drive the impeller 310.
An Exemplary View
Fig. 8 illustrates an example of the flow pattern of the fluid along the blades 320 of the impeller 310. The figure represents a cut section of the impeller 310. It depicts how the flow enters the blade with a centrifugal effect. It is the centrifugal effect that enhances the performance of the centrifugal regenerative blowing device 300.

An Exemplary View
Fig. 9 illustrates a sectional view of the centrifugal regenerative blowing device 300. The figure shows the assembly of the centrifugal regenerative blowing device 300. The figure depicts the impeller 310, the upper housing 306 and the lower housing 308. The figure clearly illustrates the positioning of the axial inlet 302 above the blades 310. It should be noted that the entry of fluid to the centrifugal regenerative blowing device 300 is through an axial inlet 302 and exit through a radial outlet 304. However, the fluid enters the impeller 310 of the centrifugal regenerative blowing device 300 in both axial and radial direction simultaneously.
While the invention has been particularly shown and described with reference to the preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.

CLAIMS
1/ We claim:
1. A centrifugal regenerative blowing device providing both radial and axial entry of
fluid into an impeller comprising:
a casing, having torodial and circular cross section, having an upper housing; and a lower housing;
an axial inlet provided in the upper housing for entry of the fluid;
a radial outlet provided in the casing for exit of the fluid; and
an impeller housed in the casing, said impeller comprising a plurality of blades disposed symmetrically and circumferentially along the periphery of the impeller, said blades are forward curved in the direction of rotation of the impeller;
wherein said axial inlet, positioned above the blades of the impeller, covering three-fourth of the length of the blades.
2. The blowing device of claim 1, wherein the blowing device is coupled to a drive mechanism.
3. The blowing device of claim 1, wherein the casing acts as a mounting device for a drive motor.
4. The blowing device of claim 1, wherein the casing directs the fluid flow from the axial inlet to radial outlet.
5. The blowing device of claim 1, wherein the upper housing and the lower housing are symmetrical in inner profile.
6. The blowing device of claim 1, wherein lower housing holds motor mountings.
7. The blowing device of claim 1, wherein the axial inlet has a parallelogram cross section.
8. The impeller of claim 1, wherein the blades of the impeller are provided with chamfer on both top and bottom face of the blades.

9. The impeller of claim 1, wherein the blades of the impeller are designed in curved shape to increase the fluid flow area.