Description: FIELD
The present disclosure relates to the field of centrifugal pumps
DEFINITION
As used in the present disclosure, the following terms are generally intended to have the meaning as set forth below, except to the extent that the context in which they are used indicate otherwise.
Head – the term head refers to the maximum height of liquid pumped by a pump against gravity
BACKGROUND
The background information herein below relates to the present disclosure but is not necessarily prior art.
Conventional methods to reduce vibrations on the pump walls include trimming of the vanes or trimming the volute casing tongue or a combination of both the methods. However, mere trimming of the vanes alters the performance characteristics of the centrifugal pump. Trimming results in increased radial gap between the trailing edge and the volute tongue which reduces the pressure pulsations produced during operation of the pump. More particularly, the head-discharge characteristics are compromised as trimming causes the impeller diameter to be reduced. Being directly proportional to the head developed by the pump, reduction in diameter decreases the site specific achievement by the pump.
Therefore, there is felt a need, for a centrifugal pump impeller, which alleviates the aforementioned drawbacks.
OBJECTS
Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows:
An object of the present disclosure is to provide a centrifugal pump impeller that reduces the fluid induced pressure pulsations.
Another object of the present disclosure is to provide a centrifugal pump impeller that reduces the vibration and noise levels of the pump.
Still another object of the present disclosure is to provide a centrifugal pump impeller that does not compromise the operating characteristics of the pump.
Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.
SUMMARY
The present disclosure discloses a centrifugal pump impeller having curved vanes with each vane comprising a first fillet configured on the vane suction side near the trailing edge, grooves configured on the trailing edge to reduce wake flow development on the suction side of the vane, and a plurality of second fillets configured on the edges of the grooves.
In a preferred embodiment, each of the grooves is a V-shaped groove.
In another embodiment, wherein the depth of the grooves is variable.
In another embodiment, the angle of inclinaton of the walls of the V-shaped grooves is variable.
In a preferred embodiment, the grooves are configured on the trailing edge of the vanes.
In a preferred embodiment, the radius of each of the plurality of second fillets 49 is in the range of 2 mm and 4 mm.
In another embodiment, the dimensions of the first fillet 46 on the vane suction side is in the range of 100 mm and 150 mm.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
A centrifugal pump impeller, of the present disclosure, will now be described with the help of the accompanying drawing, in which:
Figure 1 shows a side view of the centrifugal pump having double suction inlets in accordance to an embodiment of the present disclosure;
Figure 2 shows a front view of the vane of the centrifugal pump impeller, in accordance to an embodiment of the present disclosure;
Figure 3 shows a rear view of the vane of the centrifugal pump impeller, in accordance to an embodiment of the present disclosure;
Figure 4 shows a side view of the vane of the centrifugal pump impeller;
Figure 5 shows an isometric view of the vane of the pump impeller;
Figure 6 shows a detail of the Figure 2;
Figure 7 shows a detail of the Figure 3; and
Figure 8 shows a rear view of the groove of the vane.
LIST OF REFERENCE NUMERALS
10 – volute casing
20 – impeller
30 – volute tongue
40 – impeller vane
41 – vane trailing edge
42 – vane suction side
44 – vane pressure side
46 – first fillet on vane suction side
48 – groove
49 – second fillets
50 – centrifugal pump impeller
100 – centrifugal pump
DETAILED DESCRIPTION
Embodiments, of the present disclosure, will now be described with reference to the accompanying drawing.
Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details are set forth relating to specific components to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.
The terminology used, in the present disclosure, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present disclosure. As used in the present disclosure, the forms “a,” “an,” and “the” may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are open ended transitional phrases and therefore specify the presence of stated elements, modules, units and/or components, but do not forbid the presence or addition of one or more other elements, components, and/or groups thereof.
The terms first, second, third, etc., should not be construed to limit the scope of the present disclosure as the aforementioned terms may be only used to distinguish one element, component, region, layer or section from another component, or section. Terms such as first, second, third etc., when used herein do not imply a specific sequence or order unless clearly suggested by the present disclosure.
The present disclosure discloses a centrifugal pump impeller that facilitates reduction in pressure pulsations of the fluid being pumped therewith which facilitates reduced structural vibrations and noise generation of the pump body.
Referring to the figures 1-8, the centrifugal pump 100 will now be described in detail. The centrifugal pump 100 has vanes 40 attached to the centrifugal pump impeller 50. Each of the vanes 40 has a suction side 42 and a pressure side 44. A trailing edge 41 is defined far with respect to the impeller outlet, while a leading edge is defined near to the impeller inlet. The centrifugal pump impeller 50 comprises a first fillet 46 configured on the vane suction side 42, near vane trailing edge 41 of each of the vanes 40. Grooves 48 are configured on the trailing edge 41 of each of the vanes 40 to reduce wake flow development on the suction side 42 of the vanes 40. A plurality of second fillets 49 is configured on the edges of each of the grooves 48. The first fillet 46, the grooves 48 and the plurality of second fillets 49 facilitate reduction in wake flow development on the suction side 42 of the vanes 40. The grooves 48 are configured on the pressure side 44 of the vanes 40.
In another emdodiment, each of the grooves 48 is a V-shaped groove.
In an emdodiment, the depth of the grooves 48 is variable.
In another emdodiment, the radius of each of the second fillets 49 is in the range of 2 mm to 4 mm.
In yet another embodiment, the angle of inclinaton of the walls of the V-shaped grooves 48 is variable.
In still another embodiment, the dimensions of the first fillet 46 is in the range of 100 mm and 150 mm.
The vanes 40 of the centrifugal pump impeller 50 of the present disclosure reduces the pressure pulsations and improves the efficiency. This is explained with two basic reasons. Firstly, the vane 40 reduces the wake flow development on the suction side 42 of the vane 40. Wake is a form of impeller head loss and reduction of the wake phenomenon reduces the head loss and improves the pump efficiency. Also, the interaction of the jet-wake flow created near the impeller trailing edge 41 with the volute tongue 30 results in pressure pulsations and hence the noise and vibrations of the pump. The geometry of the vane reduces the intensity of the jet-wake flow and hence the reduction in rotor-stator interaction phenomenon. This reduces the pressure pulsations developed during pumping of the fluid.
Secondly, the pressure side 44 surface of the vane 40 is exposed to high relative velocity and the suction side 42 surface of the vane 40 consists the low relative velocity. Occasionally, the flow recirculation happens. The grooves 48 and the fillets 49 on the grooves 48 results in mixing of the high energy flow from the pressure side 44 to the suction side 42. This further reduces the wake formation phenomenon along with increasing the momentum of fluid on the suction side 42.
The foregoing description of the embodiments has been provided for purposes of illustration and not intended to limit the scope of the present disclosure. Individual components of a particular embodiment are generally not limited to that particular embodiment, but, are interchangeable. Such variations are not to be regarded as a departure from the present disclosure, and all such modifications are considered to be within the scope of the present disclosure.
TECHNICAL ADVANCEMENTS
The present disclosure described herein above has several technical advantages including, but not limited to, the realization of a vane pump, which:
• significantly reduces pressure pulsations of the fluid being pumped;
• reduces the mechanical vibrations of the pump body; and
• offers improved efficiency of the pumping operation.
The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
The foregoing description of the specific embodiments so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
The use of the expression “at least” or “at least one” suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the disclosure to achieve one or more of the desired objects or results.
Any discussion of devices, articles or the like that has been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form a part of the prior art base or were common general knowledge in the field relevant to the disclosure as it existed anywhere before the priority date of this application.
While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many embodiments can be made and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other changes in the preferred embodiment as well as other embodiments of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation. , Claims: WE CLAIM:
1. A centrifugal pump impeller (50) having curved vanes (40), each vane (40) comprising:
• a first fillet (46) configured on the vane suction side (42) near the trailing edge (41);
• grooves (48) configured on the trailing edge (41) to reduce wake flow development on the suction side (42) of the vane (40); and
• a plurality of second fillets (49) configured on the edges of said grooves (48).
2. The centrifugal pump impeller (50) as claimed in claim 1, wherein each of said grooves (48) is a V-shaped groove.
3. The centrifugal pump impeller (50) as claimed in claim 1, wherein the depth of said grooves (48) is variable.
4. The centrifugal pump impeller (50) as claimed in claim 1, wherein the angle of inclinaton of the walls of the V-shaped grooves is variable.
5. The centrifugal pump impeller (50) as claimed in claim 1, wherein said grooves (48) are configured on the pressure side (44) of the vanes (40).
6. The centrifugal pump impeller (50) as claimed in claim 1, wherein the radius of each of said second fillets (49) is in the range of 2 mm and 4 mm.
7. The centrifugal pump impeller (50) as claimed in claim 1, wherein the dimensions of said first fillet (46) is in the range of 100 mm and 150 mm.
Dated this 4th Day of May, 2022

MOHAN RAJKUMAR DEWAN, IN/PA-25
of R.K. DEWAN & COMPANY
APPLICANT’S PATENT ATTORNEY