Claims:

1. A peripheral type regenerative pump, comprising:
an impeller including plurality of radial blades separated on both sides of outer diameter of the said impeller and a means, formed on both sides wall of the casing, directs fluid back toward the impeller.;
wherein the space between each adjacent blade establishes a radial flow channel;
wherein the blade consists of the leading edge, the curve on the blade root, the blade root, the shroud edge, the trailing edge, and the hub plate;
wherein the said impeller is driven by axis of a motor is through the central hole of the hub with a slot .
wherein the space between each adjacent blade which establishes a radial flow channel includes a semicircular profile for channel casing for smooth flow of fluid through pump;
wherein the blade root of the impeller has been provided with bigger thickness in order provide the unique curve near the leading edge and keep the inlet of blades with axial curve structure;
wherein the said impeller has a fluid inlet and a fluid outlet separated by a stripper;
wherein the said stripper generally has a close clearance to a periphery of the impeller;
wherein the casing has axially spaced, radially extending first and second side walls facing the first and second surfaces respectively; and
wherein the axially and radially extending blade means is formed on an outer radial periphery of the pump for driving fluid from the inlet toward the outlet as the impeller rotates about the axis of rotation.

2. The peripheral type regenerative pump as claimed in claim 1, wherein the blade means preferably includes a plurality of blades spaced circumferentially around the outer radial periphery of the impeller.
3. The peripheral type regenerative pump as claimed in claim 1, wherein each blade has a radially inward base portion extending in a generally trailing direction with respect to rotation of the impeller and a radially outward tip portion extending in a generally leading direction with respect to rotation of the impeller.
3. The peripheral type regenerative pump as claimed in claim 1, wherein the blade includes chamfer means is preferably formed on the base portion of each blade for deflecting fluid from the inlet toward the pocket defined between two adjacent blades and the casing. Preferably, the chamfer means is formed on a trailing edge of the base portion of each blade. Alternatively, the chamfer means may be formed as a curved surface having a predetermined radius connecting a generally radially extending surface of each blade to a generally axially extending surface of the respective blade along a trailing edge.

4. The peripheral type regenerative pump as claimed in claim 1, wherein the blade means may include a plurality of blades spaced circumferentially around the outer radial periphery of the impeller,
5. The peripheral type regenerative pump as claimed in claim 1, wherein the base portion of each blade preferably forms an entry angle with respect to a radially extending plane normal to the axis of rotation of the impeller.
6. The peripheral type regenerative pump as claimed in claim 1, wherein the tip portion of blade preferably forms an exit angle with respect to a radially extending plane normal to the axis of rotation of the impeller.
7. The peripheral type regenerative pump as claimed in claim 1, wherein the fluid directing include at least one of the first and second side walls having a generally ring-shaped, side channel portion formed in the casing around the axis of rotation for directing fluid helically back into contact with the blade means as the impeller rotates.
8. The peripheral type regenerative pump as claimed in claim 1, wherein the fluid directing means preferably is formed symmetrically in the first and second side walls of the casing around the axis of rotation of the impeller.
9. The peripheral type regenerative pump as claimed in claim 1, wherein the base portion of each blade preferably forms an entry angle with respect to a radially extending plane normal to the axis of rotation of the impeller is 90o and the tip portion preferably forms an exit angle with respect to a radially extending plane normal to the axis of rotation of the impeller 90o.

, Description:

FIELD OF INVENTION

The present invention relates to an improved peripheral type regenerative pump. More particularly, the present invention discloses an improved impeller profile and a casing designed in order to increase the hydraulic efficiency and reduce the slip losses, incidence losses, shock losses, friction losses & mixing losses during the flow.

BACKGROUND ART
Regenerative pumps are rotodynamic, self-priming pump produces high head at low flowrate. These pumps are the subject of increased interest in industry because of its unique design, stable characteristics and operational features. But hydraulic efficiency of these pumps is very low (less than 40%) because of the slip losses, incidence losses, shock losses, friction losses & mixing losses during the flow. To reduce that losses design of impeller, casing channel & adapter of pump is modified.
This invention relates to a regenerative pump of the kind comprising a housing with a pump inlet and a pump outlet, an impeller rotatably mounted within the housing and having a plurality of blades forming a series of cells spaced angularly around the axis of rotation of the impeller as shown in Fig 1 (a) and flow channel within the housing extending between the pump inlet and pump outlet and including a guide channel in the housing located alongside the impeller so that the cells open laterally of the plane of rotation of the impeller into said guide channel and cooperate therewith to induce a spiral or helical flow of fluid through the guide channel and cells along the length of said flow channel as the impeller is rotated.
In the known regenerative pumps of this kind, the blades of the impeller may extend perpendicular to the plane of rotation of the impeller or may be inclined from this perpendicular plane forwards in the direction of rotation at their outer edge so that the cells fill more efficiently and throw the fluid forwards into the guide channel as the impeller rotates. Typically, the blades are inclined at an angle of approximately 45 degrees and the opposite surfaces of each blade are flat and parallel to one another and at their outer edges meet a flat outer surface of the blade parallel to the plane of rotation of the impeller which closely cooperates with the inner surfaces of the housing to limit the circumferential flow of fluid between adjacent cells, especially in the region known as the stripper between the pump outlet and pump inlet. In all cases, the blades are of a substantially uniform cross-section throughout their radial length; in particular those sections adjacent to the pump inlet and guide channel have the same cross-section.
In regenerative pump head generated due to repeated circulation of water in between blades as it passes from inlet to outlet. But when the impeller profile and channel area are not properly designed then it causes more slip losses, incident losses and shock losses hence getting low hydraulic efficiency (less than 40%). To reduce these losses proper design of impeller profile and channel required.

Over time, industry and household needs in connection with pumps and accessories have changed. Therefore, it is desirable in the present invention to provide a greater fluid flow output at the same or greater pressure for a given size housing configuration. It is further desirable in the present invention to reduce the electrical current or power requirements for a motor used in an electric motor driven pump for a given pressure and/or flow output.. Additionally, it is desirable in the present invention to increase overall efficiency and to provide for longer life and enhance reliability of regenerative pumps, and in particular, single stage, peripheral channel, electrical water pumps.
In the prior art, an US specification US4678395 discloses regenerative pump having a casing with a casing inlet and casing outlet, an impeller disposed on a shaft and containing at least one bucket ring with axially and radially open bucket compartments on the first and second side of the impeller, and mutually separated side channels having an entrance port, an exit port and an interrupter. The arrangement is such that the conveying streams on the two sides of the impeller are separated from each other. The entrance ports of the side channels on the two impeller sides are in communication with the casing inlet, and the exit ports are in communication with the casing outlet, so that the conveying streams are first subdivided and then recombined.
In another prior art, an US specification US8262339B2 discloses a new structure of a regenerative pump, including a cross section structure of the flow channel of a pump casing and closed type impeller, whereby to improve a better flow model for pump performance to solve problems of noise, and to increase the outflow capacity and higher efficiency.
In another prior art, an US specification US5407318 discloses a regenerative pump including a rotatable impeller disposed in a housing. The impeller has a plurality of radially extending blade members spaced apart about a periphery of the impeller. Each blade member has circumferentially-facing upstream and downstream surfaces, relative to an operational direction of impeller rotation. At least one of the upstream and downstream surfaces of each blade member has a proximal portion which is inclined or curved away from the operational rotation direction, and a distal portion which is inclined or curved towards the operational rotation direction. The curved/inclined surface advantageously enhances pump efficiency.
In another prior art, an US specification US5498124 discloses regenerative pump includes a casing which a recessed fluid flow passage interconnecting a suction port and a discharge port is formed in an arcuate shape. An impeller is provided rotatably with respect to the casing and formed with a plurality of blade members which face the recessed fluid flow passage. A recessed damping portion is formed in a terminal end portion of the recessed fluid flow passage on a discharge port side thereof to begin at a position corresponding to the discharge port and extend along a rotating direction of the impeller.
In a non-Patent literature, Maity et al. [1] carried out numerical study of regenerative pump to investigate the effect of geometry modifications like curvature in the outlet flow domain, offsetting impeller blades on either side of impeller, semi-circular profile of impeller and different number of blade on each side of impeller on the head generated, power consumption and hydraulic efficiency of the pump.

Further, Nejadrajabali et al. [2] used CFD software ANSYS Fluent in order to investigate the effect of inlet and outlet angle of curved blade on the performance of a pump. Karanth et al. [3] used CFD software ANSYS Fluent to analyse outcome of geometrical modification like radial inlet and exit chamber with constant width, splitter blades used near the outlet flow domain and varying number of impeller blades. Quail et al. [4, 5] compares numerical and analytical technique for finding the performance for a new RFP design. The performance characteristics figure out using CFD software ANSYS Fluent and a new one-dimensional model is validated to experimental results. Rajmane et al. [6] carried out the numerical simulations using ANSYS Fluent to improve the head of the regenerative pump. Many alternatives were made in the geometry of pump these are providing additional splitter in the outlet passage, increasing number of blades and inclining the straight radial blades. Choi et al. [7] carried out an experimental study to investigate the effect of straight blades with inclined blade angles and chevron angles on head and efficiency of pump. Griffini et. al. [8] carried out detailed numerical investigation of airfoil blading regenerative compressor for optimizing performance.

SUMMARY OF INVENTION

An object of the present invention is to provide a regenerative pump of the aforesaid kind with improved performance.
According to the present invention, a regenerative pump of the aforesaid kind has impeller blades which are adapted so that the profile of the trailing surface of each blade is radial
A regenerative pump for adding energy to a fluid, according to the present invention, includes an impeller having an axis of rotation and axially spaced, radially extending first and second surfaces. A radially split casing encloses the impeller and has a fluid inlet and a fluid outlet separated by a stripper. The stripper generally has a close clearance to a periphery of the impeller. The casing has axially spaced, radially extending first and second side walls facing the first and second surfaces respectively. Axially and radially extending blade means is formed on an outer radial periphery of the pump for driving fluid from the inlet toward the outlet as the impeller rotates about the axis of rotation. Means, formed in both sides wall of the casing, directs fluid back toward the impeller.

The blade means preferably includes a plurality of blades spaced circumferentially around the outer radial periphery of the impeller. Each blade has a radially inward base portion extending in a generally trailing direction with respect to rotation of the impeller and a radially outward tip portion extending in a generally leading direction with respect to rotation of the impeller.

In an embodiment the chamfer means is preferably formed on the base portion of each blade for deflecting fluid from the inlet toward the pocket defined between two adjacent blades and the casing. Preferably, the chamfer means is formed on a trailing edge of the base portion of each blade. Alternatively, the chamfer means may be formed as a curved surface having a predetermined radius connecting a generally radially extending surface of each blade to a generally axially extending surface of the respective blade along a trailing edge.

In another embodiment, the blade means may include a plurality of blades spaced circumferentially around the outer radial periphery of the impeller, The base portion of each blade preferably forms an entry angle with respect to a radially extending plane normal to the axis of rotation of the impeller. The tip portion preferably forms an exit angle with respect to a radially extending plane normal to the axis of rotation of the impeller.

Therefore such as herein described there is provided a peripheral type regenerative pump, comprising of an impeller including plurality of radial blades separated on both sides of outer diameter of the said impeller and a means, formed on both sides wall of the casing, directs fluid back toward the impeller; wherein the space between each adjacent blade establishes a radial flow channel; wherein the blade consists of the leading edge, the curve on the blade root, the blade root, the shroud edge, the trailing edge, and the hub plate; wherein the said impeller is driven by axis of a motor is through the central hole of the hub with a slot; wherein the space between each adjacent blade which establishes a radial flow channel includes a semicircular profile for channel casing for smooth flow of fluid through pump; wherein the blade root of the impeller has been provided with bigger thickness in order provide the unique curve near the leading edge and keep the inlet of blades with axial curve structure; wherein the said impeller has a fluid inlet and a fluid outlet separated by a stripper; wherein the said stripper generally has a close clearance to a periphery of the impeller; wherein the casing has axially spaced, radially extending first and second side walls facing the first and second surfaces respectively; and wherein the axially and radially extending blade means is formed on an outer radial periphery of the pump for driving fluid from the inlet toward the outlet as the impeller rotates about the axis of rotation.

Other objects, advantages and applications of the present invention will become apparent to those skilled in the art when the following description of the best mode contemplated for practicing the invention is read in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

Figure 1 (a) and (b) illustrates a prior art existing impeller design and pump design;

Figure 2 (a) and (b) illustrates the proposed impeller design in accordance with the present invention;

Figure 3 illustrates the flow channel of the impeller in accordance with the present invention;

Figure 4 illustrates the assembly of front casing, back casing & impeller section view of the pump in accordance with the present invention;

Figure 5 illustrates the front casing section of the pump in accordance with the present invention;

Figure 6 (a) and (b) illustrates the front and back casing of the pump in accordance with the present invention;

Figure 7 illustrates the fluid flow in channel with existing design from CFD analysis as prior art;

Figure 8 illustrates the Fluid flow in channel with proposed design From CFD analysis in accordance with the present invention;

Figure 9 illustrates the Hydraulic efficiency comparison in accordance with the present invention;

DETAILED DESCRIPTION

Regenerative pumps have traditionally been constructed, when there are two channels, with side channels equal in cross-section. The symmetric channels according to the present invention is used with a standard configuration impeller for a regenerative pump, or may be used in combination with the arcuate blade impeller configuration according to the present invention for further performance enhancement. Generally speaking, the impeller have an approximately cylindrical shape, the directions with respect to the defined form, namely a radial direction, an axial direction and a circumferential direction. The impeller is designed herein for increasing the power and efficiency. In these figures has the impeller a body including a hub and numerous blades (vanes) may have, extending radially outwardly from the hub. The hub can be adapted to a rotary shaft of the motor to be connected. the blades can circumferentially around the entire hub extend around and can in each case a terminal end have at a radially outermost point of the blade. A peripheral surface (bucket shape) radially outermost periphery of the impeller lying in this embodiment partly through the terminal end the blades is being defined. And finally, the impeller comprises a first axial face (leading) and a second axial face (trailing) respectively. The leading and trailing axial face can be defined by planar surfaces located at opposite, axially outermost ends of the impeller are located.

FIG. 2 is a sectional view of a impeller of the present invention. The structure of an impeller is a circular plate. There are plural radial blades on both sides of outer diameter of an impeller. The space between each adjacent blade establishes a radial flow channel. The blade consists of the leading edge, the curve on the blade root, the blade root, the shroud edge, the trailing edge, and the hub plate. The impeller driven by axis of a motor is through the central hole of the hub with a slot . The thickness of an impeller includes the thickness of the outer diameter of a circular plate and the thickness of the blade root. The space between each adjacent blade which establishes a radial flow channel is modified with a semicircular profile for channel casing shown in fig.4. This help to smooth flow of fluid through pump. Impeller peripheral profile designed in such a way that improves the flow circulation and increases area for momentum transfer shown in fig.3. The blade root of the impeller has been provided with bigger thickness in order provide the unique curve near the leading edge and keep the inlet of blades with axial curve structure. This design can improve greatly the curvature radius of a streamline at the leading edge, shown in FIG. 2 - 4.

The outer diameter of a hub plate of blade is larger than the outer diameter of shroud plate, the trailing edge is an incline line extension from the out diameter of shroud plate to hub plate outer diameter, and the pine point has a semicircular profile with height equal to the half of the blade height.

FIG. 4 is a cross section of the flow channel of a pump casing of the present invention., and the flow model is shown in Fig 8. The flow channel inside pump casing and flow channel between blades of impeller, the cross section is modified to a circular path. . In FIG. 3 and 8, when the fluid is flowing out from the trailing edge from blades flow channel, the streamline has to make a turning angle near 180°, from the interior top wall then turn towards the side wall, shown as the streamline. The flow along the side wall forwards to the leading edge, streamline make a U turn to turn into leading edge and to connect streamline, owing to space.

The rear swept lower, or entry, or base portion of the blade with forward swept tip approximately midway up from the root of the blade, as previously described with respect to the present invention and can advantageously be used in combination with the channels. The arcuate blade configuration, as previously described, can also include the modification of chamfer means for easing entry of fluid, particularly where the entry angle is large relative to the impeller axis. As the flow rate is reduced and the pressure rises, the ease of entry for fluid into the impeller is a feature that is associated with results that reveal improved maximum pressure for a given shaft speed and higher efficiency. As previously described, the chamfer means may also take an alternative curvilinear profile.

The present invention discloses regenerative pumps of the type embodying a central rotor with blades extending generally radially, either in a straight radial fashion, or in an arcuate fashion. Typically, a pump of this type includes a housing means for mounting a drive motor and one of the side channels, a rotor with generally radially extending blades at its outer region on one or more axial sides of the rotor, and a cover sealingly engaged with the housing and a second side channel. The present invention allows matching of a pump's capacity to the requirements of a particular application without changing shaft rotational speed. Previously the channels and the housing and cover have been equal, or symmetrical in cross-section, and differ only at the impeller and pump design and where it is common to place transfer inlet and delivery passages from the housing channel to ducts in the cover or housing.

Proposed peripheral type regenerative pump design provided with circular profile to the casing channel, adapter and impeller which helps to guide the fluid flow shown in fig. 6, 7. In regenerative pump head generated by circulatory motion of fluid and this design helps to increase the circulation of fluid with minimum slip, incident, shock and mixing losses. New designed pump has higher efficiency than existing pump. This is also economical design having same head at low impeller diameter for same flow rate

As discussed above the existing impeller have two sided offseted blades to each other and full middle profile is provided shown in fig.1. In proposed impeller design both sides impeller blades are inline with each other and half middle profile provided shown in fig. 2(a), which causes increase in imparting area and hence energy transformation increases. Existing pump design have rectangular cross sectional flow area shown in fig. 1, so profile angle of geometry not matches with the flow angle of fluid and incident losses takes place. Proposed pump design provided with circular cross sectional flow area shown in fig. 3, 8 which helps to guide the fluid in proper direction with minimum incident losses.

Referring to FIG. 2, the structure of a regenerative impeller technique is a circular plate and the whole one most is in an even thickness, the thickness of the Blade root and the thickness of the impeller are same. There are plural radial blades on the both sides or just on one side around the outer diameter of an impeller. The impeller as proposed herein has half middle profile is also of a Single bucket type. The chamfer means may be formed at an angle with respect to a radially extending plane normal to the axis of rotation of the impeller is 90o inclusive. Alternatively, the chamfer means may be formed as a curved surface having a predetermined radius connecting a generally radially extending surface of each blade to a generally axially extending surface of the respective blade along a trailing edge. The space between each adjacent Blade establishes a constant radial flow channel. The blade consists of the leading edge, the curve on the blade root, the blade root, the shroud edge, the trailing edge, and a hub plate of the impeller. The hole with a slot at the center on the hub of the impeller is used to be driven by the axis of motor.

There are plural ribs to connect the hub with the blade root of the impeller. As the structure of an impeller, the energy in a regenerative pump is transferred through motor shaft to flow become a flow power, the mechanism is to rotate impeller in a tangent velocity and to intake the flow through the inlet port to empower the fluid. The tracing of the flowing elements could be shown as Fig 7. This is the first energized cycle be transfer by the radial blade of an impeller, the inlet flow turns into the streamline at leading edge that earns a velocity, and get a tangent Velocity in the, same direction as tangent Velocity at tailing edge, the total quantity of these two velocities is the absolute velocity of fluid, and the tangent velocity is that the blade root works down the fluid. After leaving from the trailing edge, the fluid is flowing into the flow channel inside pump casing and turn along by the interior wall of the flow channel to enter the leading edge of impeller again, shown as Fig 7. The tangent Velocity is increased because of earning works through the blade root again. The flow will repeat the same procedure of being energized by the blade root several times before flowing out from the outlet port. After the fluid was energized by the blade root several times, the flowing absolute velocity is approximate equal to the tangent Velocity of impeller, and the fluid has a higher static pressure; which is the reason why a regenerative pump could discharge a high head pressure.

The base portion of each blade preferably forms an entry angle with respect to a radially extending plane normal to the axis of rotation of the impeller is 90o The tip portion preferably forms an exit angle with respect to a radially extending plane normal to the axis of rotation of the impeller in a range selected from between is 90o

As shown in FIGS. 4 and 6(a), a pump flow passage of an arcuate shape is defined between the casing body and the inner surface of the front casing. Further, a suction port communicating with one end of the pump flow passage is formed in the front casing whereas a discharge port communicating with the other end of the pump flow passage is formed in the casing body. A partition portion for preventing reverse flows of fluid is formed between the suction port and the discharge port. The discharge port is penetrated through the front casing and connected to a space inside of the pump portion. Therefore, discharged through the discharge port passes the space inside of the pump portion and is discharged through a discharge port (see FIG. 6(a)) formed in the other end of the front casing.

FIG. 4 is a sectional view of the front casing, back casing, impeller assembly. FIG. 6(a) is an enlarged plan view partially showing the front casing and FIG. 5 is a sectional view of the front casing with Fig 6(b) enlarged plan view partially showing the back casing as viewed in a direction of the arrows.

The pump portion as described herein comprises the casing body, the casing cover, an impeller and so forth. The casing body and the casing cover are formed by, for instance, die casting of aluminum. The casing body is press-fitted in one end of the housing. A rotational shaft of the armature is penetrated through and supported in a bearing which is secured in the center of the casing body. On the other hand, the casing cover is placed over the casing body and fixed in the one end of the housing in this state. The casing body and the casing cover constitute a sealed casing in which the impeller is rotatably housed.

As shown in FIG. 2, 4, a substantially fitting hole is formed in the center of the impeller, and is closely fitted on a centre portion of the rotational shaft. Consequently, although the impeller rotates integrally with the rotational shaft, it is slightly movable in the axial direction.

Inventive step:
In Proposed peripheral type regenerative pump, hydraulic design provided with circular profile to the casing channel, adapter and impeller which helps to guide the fluid. In Regenerative pump head generated due to true circulatory motion of fluid and this design helps to increase the circulation of fluid with minimum slip, incident, shock and mixing losses. New designed pump has higher efficiency than existing pump (square channel type pump). This is also economical design having same performance at low impeller diameter, low material. Running cost of pump also less due to energy efficient design.

1. Cost of the pump:

Parts MOC Approximate % Cost Saving in proposed pump parts with respect to Existing model
Volute Casing CI FG200 23-25%
Adapter CI FG200 18-20%
Impeller Brass 36-40%
Electric parts Cu & Stamping 4-5%

• Percentage approximate cost saving per pump is 10%

2. Material saving in proposed pump parts wrt Existing pump:
• 36-40 % material saving in impeller
• 18-20% in adapter
• 33-25% in casing volute
• 5% in Copper & Stamping

3. Compactness (major) in proposed pump part wrt Existing pump:
• Impeller diameter reduces by approximately 10%
• Volute and adapter sizes are reducing by approximately 5%.

4. Environmental benefit
Percentage increase in hydraulic efficiency of proposed pump is 25% to 30% as shown in Fig.9, hence required less power consumption for same performance.

5. Saving electricity which leads to cost saving
Due to energy efficient proposed pump design, electricity consumption reduces and decrease in cost of electricity.
The salient features of proposed peripheral type regenerative pump design are as follows:
1. This type of design provides proper guidance to the circulating fluid causes increases the circulation and reduces the losses.
2. It provides higher efficiency than existing design
3. Provide higher head coefficient at low impeller diameter for same flow coefficient
4. This is economic design than existing (lower weight of back casing, impeller and front casing for same performance with higher efficiency)
5. With proposed impeller design get higher imparting area hence increases rate of momentum transfer.
6. Simple design of proposed impeller & easy to manufacture.

Although the foregoing description of the present invention has been shown and described with reference to particular embodiments and applications thereof, it has been presented for purposes of illustration by way of examples and description and is not intended to be exhaustive or to limit the invention to the particular embodiments and applications disclosed. The particular embodiments and applications were chosen and described to provide the best illustration of the principles of the invention and its practical application to thereby enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. All such changes, modifications, variations, and alterations should therefore be seen as being within the scope of the present invention as determined by the appended claims when interpreted in accordance with the breadth to which they are fairly, legally, and equitably entitled.

References
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