Description:FIELD OF THE INVENTION

The present disclosure relates to centrifugal pumps. More particularly, the present disclosure discloses an impeller for a centrifugal pump such that the impeller includes secondary vanes to improve delivery head without loss in efficiency of the centrifugal pump.

BACKGROUND

Impellers generally refer to a driven rotor used to increase the pressure and flow of a fluid. It is the opposite of a turbine, which extracts energy from, and reduces the pressure of, a flowing fluid.

In centrifugal pumps, the impeller is a rotating component that accelerates fluid outward from the center of rotation, thus transferring energy from the motor that drives the pump to the fluid being pumped. The velocity achieved by the impeller transfers into pressure when the outward movement of the fluid is confined by the pump casing. The provision of vanes defined on an exterior surface of the impeller determine the delivery head of the centrifugal pump. A centrifugal pump that generates an increased delivery head value than the baseline design of the impeller without compromising the hydraulic efficiency of the centrifugal pump, is therefore desired.

SUMMARY

This summary is provided to introduce a selection of concepts, in a simplified format, that are further described in the detailed description of the invention. This summary is neither intended to identify key or essential inventive concepts of the invention and nor is it intended for determining the scope of the invention.

The present disclosure relates to an impeller for a centrifugal pump. The impeller, disclosed herein, includes a circular disc, a plurality of primary vanes, and a plurality of secondary vanes. The plurality of primary vanes is disposed on the circular disc such that the primary vanes extend radially from a radially inward portion of the circular disc to an outer-most edge of the circular disc. The plurality of secondary vanes are disposed on the circular disc such that each secondary vane is positioned between an adjacent set of primary vanes and extends radially from a radially inward portion of the circular disc to an outer-most edge of the circular disc.

Also disclosed herein is a centrifugal pump including a casing adapted to house a rotary shaft and at least one impeller. The casing includes an inlet adapted to receive a fluid and an outlet adapted to discharge the fluid. The at least one impeller is coupled to the rotary shaft and includes a circular disc, a plurality of primary vanes, and a plurality of secondary vanes. The plurality of primary vanes is disposed on the circular disc such that the primary vanes extend radially from a radially inward portion of the circular disc to an outer-most edge of the circular disc. The plurality of secondary vanes is disposed on the circular disc such that each secondary vane is positioned between an adjacent set of primary vanes and extends radially from a radially inward portion of the circular disc to an outer-most edge of the circular disc. Each secondary vane has an angle of attack ranging between 9 degrees and 15 degrees.

To further clarify the advantages and features of the present disclosure, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which is illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features, aspects, and advantages of the present disclosure will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:

Figure 1A illustrates a front view of an impeller, according to an embodiment of the present disclosure;

Figure 1B illustrates a front view of the impeller shown in Figure 1A; and

Figure 2A to 2B illustrates a perspective view, a side view and a cross-sectional view of a centrifugal pump having the impeller shown in Figures 1A-1B.

Further, skilled artisans will appreciate that elements in the drawings are illustrated for simplicity and may not have necessarily been drawn to scale. Furthermore, in terms of the construction of the device, a plurality of components of the device may have been represented in the drawings by conventional symbols, and the drawings may show only those specific details that are pertinent to understanding the embodiments of the present disclosure so as not to obscure the drawings with details that will be readily apparent to those of ordinary skill in the art having benefit of the description herein.

DETAILED DESCRIPTION OF FIGURES

For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated system, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skilled in the art to which invention belongs. The system and examples provided herein are illustrative only and not intended to be limiting.

For example, the term “some” as used herein may be understood as “none” or “one” or “more than one” or “all.” Therefore, the terms “none,” “one,” “more than one,” “more than one, but not all” or “all” would fall under the definition of “some.” It should be appreciated by a person skilled in the art that the terminology and structure employed herein is for describing, teaching, and illuminating some embodiments and their specific features and elements and therefore, should not be construed to limit, restrict, or reduce the spirit and scope of the present disclosure in any way.

For example, any terms used herein such as, “includes,” “comprises,” “has,” “consists,” and similar grammatical variants do not specify an exact limitation or restriction, and certainly do not exclude the possible addition of a plurality of features or elements, unless otherwise stated. Further, such terms must not be taken to exclude the possible removal of the plurality of the listed features and elements, unless otherwise stated, for example, by using the limiting language including, but not limited to, “must comprise” or “needs to include.”

Whether or not a certain feature or element was limited to being used only once, it may still be referred to as “plurality of features” or “plurality of elements” or “at least one feature” or “at least one element.” Furthermore, the use of the terms “plurality of” or “at least one” feature or element do not preclude there being none of that feature or element, unless otherwise specified by limiting language including, but not limited to, “there needs to be plurality of...” or “plurality of elements is required.”

Unless otherwise defined, all terms and especially any technical and/or scientific terms, used herein may be taken to have the same meaning as commonly understood by a person ordinarily skilled in the art.

Reference is made herein to some “embodiments.” It should be understood that an embodiment is an example of a possible implementation of any features and/or elements of the present disclosure. Some embodiments have been described for the purpose of explaining plurality of the potential ways in which the specific features and/or elements of the proposed disclosure fulfil the requirements of uniqueness, utility, and non-obviousness.

Use of the phrases and/or terms including, but not limited to, “a first embodiment,” “a further embodiment,” “an alternate embodiment,” “one embodiment,” “an embodiment,” “multiple embodiments,” “some embodiments,” “other embodiments,” “further embodiment”, “furthermore embodiment”, “additional embodiment” or other variants thereof do not necessarily refer to the same embodiments. Unless otherwise specified, plurality of particular features and/or elements described in connection with plurality of embodiments may be found in one embodiment, or may be found in more than one embodiment, or may be found in all embodiments, or may be found in no embodiments. Although plurality of features and/or elements may be described herein in the context of only a single embodiment, or in the context of more than one embodiment, or in the context of all embodiments, the features and/or elements may instead be provided separately or in any appropriate combination or not at all. Conversely, any features and/or elements described in the context of separate embodiments may alternatively be realized as existing together in the context of a single embodiment.

Any particular and all details set forth herein are used in the context of some embodiments and therefore should not necessarily be taken as limiting factors to the proposed disclosure.

Embodiments of the present disclosure will be described below in detail with reference to the accompanying drawings.

Figure 1A illustrates a front view of an impeller 100, according to an embodiment of the present disclosure. Figure 1B illustrates a front view of the impeller 100 shown in Figure 1A indicating the mean camber length (A) and the mean arc length (B).

The impeller 100 for a centrifugal pump 200, disclosed herein, includes a circular disc 101, a plurality of primary vanes 102, and a plurality of secondary vanes 103. The plurality of primary vanes 102 is disposed on the circular disc 101. Each primary vane 102 extends radially from a radially inward portion of the circular disc 101 to an outer-most edge of the circular disc 101. The plurality of secondary vanes 103 is disposed on the circular disc 101. Each secondary vane 103 is positioned between an adjacent set of primary vanes 102 and extends radially from a radially inward portion of the circular disc 101 to an outer-most edge of the circular disc 101.

In an embodiment, each secondary vane 103 has an angle of attack ranging between 9 degrees and 15 degrees. The ranges of angle of attack plays a major role in flow separation or stalling characteristics which implies the reduction of gross head before or after this angle of attack for a given set of inlet and outlet characteristics. The ratio of the mean camber length (A) of each secondary vane 103 to the mean arc length (B) of a primary flow area of the adjacent set of primary vanes 102 lies between 0.30 and 0.35. Each secondary vane 103 is hydrofoil shaped and has a cut-off trailing edge.

Figure 2A to 2B illustrates a perspective view, a side view and a cross-sectional view of a centrifugal pump 200 having the impeller 100 shown in Figures 1A-1B.

The centrifugal pump 200 includes a casing 202 adapted to house a rotary shaft 204 and at least one impeller 100 coupled to the rotary shaft. The rotary shaft 204 is adapted to be coupled to and rotated by a motor. In an embodiment, the centrifugal pump 200 is a multi-stage centrifugal pump 200. The casing 202 includes an inlet 206 adapted to receive a fluid and an outlet 208 adapted to discharge the fluid. In an embodiment, the casing 202 is a volute casing 202. The at least one impeller 100 includes the circular disc 101, the primary vanes 102, and the secondary vanes 103.

The plurality of primary vanes 102 is disposed on the circular disc 101 and extend radially from a radially inward portion of the circular disc 101 to the outer-most edge of the circular disc 101. The plurality of secondary vanes 103 is disposed on the circular disc 101 such that each secondary vane 103 is positioned between an adjacent set of primary vanes 102 and extend radially from a radially inward portion of the circular disc 101 to the outer-most edge of the circular disc 101.

Each secondary vane 103 has an angle of attack ranging between 9 degrees and 15 degrees. The ratio of the mean camber length of each secondary vane 103 to the mean arc length of a primary flow area of the adjacent set of primary vanes 102 lies between 0.30 and 0.35.

Advantageously, the improved design of the impeller 100 in the centrifugal pump 200 generates a better delivery head value than the baseline design of the impeller 100. The inclusion of the secondary vanes 103 inside the periphery of the impeller 100 increases the delivery head without compromising the hydraulic efficiency of the centrifugal pump 200. By achieving the higher value of the delivery head through same size of the impeller 100, the overall dimensions of the centrifugal pump 200 can be reduced further which will help to reduce the manufacturing cost of the centrifugal pump 200 100. With the addition of the secondary vanes 103, the pressure variation across the impeller 100 is also reduced thereby reducing noise and vibration issues of the centrifugal pump 200.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one ordinary skilled in the art to which this invention belongs. The system, methods, and examples provided herein are illustrative only and not intended to be limiting.

While specific language has been used to describe the present subject matter, any limitations arising on account thereto, are not intended. As would be apparent to a person in the art, various working modifications may be made to the method to implement the inventive concept as taught herein. The drawings and the forgoing description give examples of embodiments. Those skilled in the art will appreciate that one or more of the described elements may well be combined into a single functional element. Alternatively, certain elements may be split into multiple functional elements. Elements from one embodiment may be added to another embodiment. , Claims:1. An impeller (100) for a centrifugal pump (200), the impeller (100) comprising:
a circular disc (101);
a plurality of primary vanes (102) disposed on the circular disc (101), the primary vanes (102) extending radially from a radially inward portion of the circular disc (101) to an outer-most edge of the circular disc (101); and
a plurality of secondary vanes (103) disposed on the circular disc (101), each secondary vane (103) positioned between an adjacent set of primary vanes (102) and extending radially from a radially inward portion of the circular disc (101) to an outer-most edge of the circular disc (101).

2. An impeller (100) as claimed in claim 1, wherein each secondary vane (103) has an angle of attack ranging between 9 degrees and 15 degrees.

3. An impeller (100) as claimed in claim 1, wherein the ratio of the mean camber length (A) of each secondary vane (103) to the mean arc length (B) of a primary flow area of the adjacent set of primary vanes (102) lies between 0.30 and 0.35.

4. An impeller (100) as claimed in claim 1, wherein each secondary vane (103) is hydrofoil shaped.

5. An impeller (100) as claimed in claim 1, wherein each secondary vane (103) has a cut-off trailing edge.

6. A centrifugal pump (200) comprising:
a casing (202) adapted to house a rotary shaft (204), the casing (202) having an inlet (206) adapted to receive a fluid and an outlet (208) adapted to discharge the fluid;
at least one impeller (100) coupled to the rotary shaft (204), the at least one impeller (100) comprising:
a circular disc;
a plurality of primary vanes (102) disposed on the circular disc (101), the primary vanes (102) extending radially from a radially inward portion of the circular disc (101) to an outer-most edge of the circular disc (101); and
a plurality of secondary vanes (103) disposed on the circular disc (101), each secondary vane (103) positioned between an adjacent set of primary vanes (102) and extending radially from a radially inward portion of the circular disc (101) to an outer-most edge of the circular disc (101),
wherein, each secondary vane (103) has an angle of attack ranging between 9 degrees and 15 degrees.

7. The centrifugal pump (200) as claimed in claim 6, wherein the ratio of the mean camber length of each secondary vane (103) to the mean arc length of a primary flow area of the adjacent set of primary vanes (102) lies between 0.30 and 0.35.

8. The centrifugal pump (200) as claimed in claim 6, wherein the rotary shaft (204) is adapted to be coupled to and rotated by a motor.

9. The centrifugal pump (200) as claimed in claim 6, wherein the centrifugal pump (200) is a multi-stage centrifugal pump (200).

10. The centrifugal pump (200) as claimed in claim 6, wherein the casing (202) is a volute casing (202).