Vortex Pump

Abstract

To provide a vortex pump including a rotor that improves pumping performance using a synchronized vortex.SOLUTION: A pump rotor comprises a hub, a backplate, and a plurality of blades extending from the hub and arranged on the backplate. Each of the plurality of blades has an outer surface substantially parallel to a rotational axis of the hub, a first end part adjacent the hub and a second end part distal to the hub, and a height from a plane to the first end part is less than a height from the plane to the second end part. The plurality of blades is configured to generate a central column of a synchronized flow.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates generally to vortex pumps, and more particularly to a vortex pump including a rotor that utilizes synchronized vortex flow to improve pumping performance. [Background technology]

[0002] Conventional pumps are designed to pump a variety of liquids, materials, and slurries (i.e., solids suspended in a liquid). One type of conventional pump is the centrifugal pump. In a centrifugal pump, the fluid or slurry enters axially through a casing, is captured by the impeller blades, and is rotated tangentially and radially outward through a diffuser section of the casing. When pumping slurries, it is important to minimize direct contact of the solid material with the impeller due to wear on the impeller. Summary of the Invention [Problem to be solved by the invention]

[0003] It was discovered that a new pump design that creates a central column of synchronized flow from the pump rotor to the pump inlet, and low pressure counter swirl flow from the pump inlet to the pump outlet, improves pump performance and minimizes wear. The new pump design also creates a negative pressure area near the pump seal. The negative pressure allows the pump to achieve zero (or near zero) leakage. [Means for solving the problem]

[0004] In view of the known state of the art, it is an aspect of the present invention to provide a pump rotor including a hub, a backplate, and a plurality of blades extending from the hub and disposed on the backplate. The backplate is planar. Each of the plurality of blades has an outer surface substantially parallel to an axis of rotation of the hub, a first end adjacent the hub, and a second end distal to the hub. A height from the planar surface to the first end is less than a height from the planar surface to the second end. The plurality of blades are configured to generate a central column of synchronized flow.

[0005] Another aspect of the invention is to provide a pump including a housing and a rotor. The housing has an inlet and an outlet. The rotor includes a hub, a backplate, and a plurality of blades extending from the hub and disposed on the backplate. Each of the plurality of blades has an outer surface substantially parallel to an axis of rotation of the hub, a first end adjacent the hub, and a second end distal to the hub. A height from the plane to the first end is less than a height from the plane to the second end. The plurality of blades are configured to generate a central column of synchronized flow. [Brief description of the drawings]

[0006] Reference is now made to the accompanying drawings, which form a part of this disclosure:

[0007] [Figure 1] FIG. 2 is a top perspective view of a pump according to one embodiment of the present invention.

[0008] [Diagram 2] FIG. 2 is a top perspective view of a cross section of the pump of FIG. 1;

[0009] [Diagram 3] FIG. 2 is a bottom perspective view of a cross section of the pump of FIG. 1.

[0010] [Figure 4] FIG. 2 is an elevational view in section of the pump of FIG. 1;

[0011] [Diagram 5]FIG. 2 is a bottom view of a cross section of the pump of FIG. 1.

[0012] [Figure 6] FIG. 2 is a bottom perspective view of a rotor for the pump of FIG. 1.

[0013] [Figure 7] FIG. 7 is a top perspective view of the rotor of FIG. 6.

[0014] [Figure 8] FIG. 7 is a bottom view of the rotor of FIG. 6.

[0015] [Figure 9] FIG. 7 is a side view of the rotor of FIG. 6.

[0016] [Figure 10] FIG. 7 is a plan view of the rotor of FIG. 6.

[0017] [Figure 11] FIG. 11 is a cross-sectional side view taken along line 11-11 of FIG.

[0018] [Figure 12] FIG. 2 is a cross-sectional view of the pump of FIG. 1 showing the flow of slurry through the pump. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Selected embodiments will now be described with reference to the drawings. It will be apparent to those skilled in the art that the following description of the embodiments is provided for illustrative purposes only and is not intended to limit the present invention from the disclosure, as defined by the appended claims and their equivalents.

[0020] First, reference is made to Figures 1, 2 and 12, which show a pump according to a first embodiment. 10 is the driving motor 12 , volute or housing 14 and rotor 16 Includes: Rotor16 Housing 14 The fluid, liquid, material, and slurry are disposed within the housing. 14 Enters the rotor 16 The rotor can be pumped by 16 Inlet for fluids, liquids, materials and slurries 18 From the outlet 20 Rotor for pumping to 16 A drive motor configured to drive or rotate a 12 (Figure 12) This motor rotates at the appropriate speed. 16 The motor may be any suitable motor known in the art capable of driving the

[0021] As shown in Figures 1 to 5, the housing 14 The inlet is curved. 18 and outlet 20 or exhaust port. Housing 14 Inside 22 is usually cylindrical and has a rotor diameter D1 The inlet is located at the bottom of the housing and has a diameter larger than that of the rotor. rotate shaft A This is the rotor 16 The rotation of the housing allows fluid or material to be drawn or entrained into the housing. 20 is the inlet 18 (i.e., tangential to the rotor) from the housing, which allows the fluid or material F to 14 can be pumped out of the

[0022] As shown in Figs. 6 to 11, the rotor 16 Back plate 26 , conical center (hub) 28 and multiple blades 30a-30e Includes: Rotor 16 The backplate may be cast, molded, forged, machined or formed in any suitable manner. 26 , conical center38 and multiple blades 30a-30e The rotor may be formed into an integral, one-piece member. 16 The rotor may be made of alloy, steel, stainless steel, aluminum, zinc, bronze, rubber, plastic or any other suitable material or combination of materials. 16 It should be noted that the rotor may be of any suitable material or design. 16 Preferably, the rotor is an integral, one-piece member, however, the rotor may be formed in multiple steps or with multiple parts assembled in any suitable manner.

[0023] In one embodiment, the backplate 26 is the first page 32 (defines the first plane), the second plane 34 (defining the second plane) and the outer periphery 36 A generally circular plate having a first or upper surface. 32 is inside the housing 22 A projection or shaft extending from and facing the 38 The protrusion 38 is the driving motor 12 The second surface is connected or connectable to a drive shaft from 34 is a set of multiple blades arranged on 30a-30e As shown in FIG. 26 is the rotor 16 The rotor blades are arranged in a circular arc extending from the center of the rotor for approximately the same length as the rotor, and therefore covering the entire length of the rotor blades. 30a-30e defines a radial diameter, and the backplate 26 has a radial diameter that is the same as or approximately the same as the radial diameter of the backplate. However, The radial diameter defined by the plurality of blades 30a-30e is: Depending on the size of the particles or any other parameters, Radial diameter of backplate 26 Note that the thickness of the backplate may be in the range of 0.3 to 1.0 times that of the backplate. 26 ) prevents the fluid from flowing out of the rotor and of outlet 20 Towards Rotor 16 It is easy to push and release in the circumferential direction. Also, the back plate 26 The rotor is effective in reducing recirculation by maintaining the fluid distribution within the rotor volume. 16 and housing 14 This prevents leakage and energy loss between the upper surface of the back plate and the 26 This is also effective in reducing the static pressure loss. 16 It is also effective against the higher pressure difference and head generated by the

[0024] As shown in Figs. 6 to 11, the central part of the cone 28 is the rotor 16 The rotor is a cone-shaped rotor located at the center of the 16 The cone makes it easy to attach to the motor shaft. 26 The second side of 34 Located on top, opposite the protrusion. The center of the cone 28 is the vertex 40 and base 42 It has a base 42 Back plate 26 As shown in Figure 8, the base is adjacent to the cone-shaped apex and gradually narrows toward the base. 42 Has a radius of approximately 10.6 inches R1 , and is approximately circular. 42 The hub extends radially about 50% of the backplate. As shown in Figure 11, the apex of the cone of the hub is at an angle of about 40 degrees. α However, the base of the cone-shaped center 42 Size and cone apex 40 The angle formed by α may be of any suitable or desired size or angle.

[0025] Cone-shaped center 28 is the fluid inlet 18 From Housing 14 To ensure smooth flow inside the outlet or rotor 16 Continue toward the end of the outlet 20The hydraulic suction creates a suction that facilitates laminar flow towards the central cone. This laminar flow inducement reduces swirl and promotes recirculation within the housing, increasing the efficiency of the pump. 28 The size (length, diameter and angle) of the cone can vary depending on the size of the particles, allowing better clearance of the particles as long as laminar flow can be maintained towards the outlet. The conical center also provides a good barrier against suction to the rotor. 16 Inlet of 18 This creates better swirl up to the maximum efficiency point while preventing turbulence at flow rates higher than the maximum efficiency point, allowing the pump to pump 140% of the design maximum efficiency point. The cone size can be reduced or increased to control power consumption.

[0026] As shown in Figs. 6 to 11, multiple blades 30a-30e is the central part of the cone 28 Extending from the back plate 26 In such an embodiment, the blades are disposed on a first surface of the blade. 30a-30e The cone includes five blades, but the plurality of blades may be any suitable number of blades that provide a suitable vortex flow. Each blade includes a first surface, a second surface, an end surface, and a base surface. Each blade extends radially outward from the cone center and toward the backplate. 26 Also, since the conical center is a cone having a sloping surface, each blade follows the sloping profile of the conical center, see, for example, FIG.

[0027] First Longitudinal Plane 44 and the second longitudinal plane 46 The first and second longitudinal surfaces generally extend in a longitudinal direction parallel to the longitudinal axis of the rotor and are spaced apart from each other at a narrowing radial distance. 44 and the second longitudinal plane 46 The cone is centered about 1.5 inches apart and adjacent to the backplate 26The adjacent circumferential edges of the first longitudinal surface are spaced 2 inches apart. 44 and the second longitudinal plane 46 The first longitudinal surface is radially separated by approximately 0.5 inches. 44 and the second longitudinal plane 46 It should be noted that the first longitudinal plane can be separated in any desired manner or can be parallel as desired. Also, as the rotor size is changed, the first longitudinal plane can be changed. 44 and the second longitudinal plane 46 That is, in the embodiment, the change in the spacing of the first longitudinal surface can be changed. 44 and the second longitudinal plane 46 The change in the spacing between the backplates is 33%. 26 At the periphery of the first longitudinal surface 44 and the second longitudinal plane 46 The spacing between the first longitudinal surface adjacent the conical center 44 and the second longitudinal plane 46 The spacing between is also 33% larger.

[0028] As shown in Figures 6, 7, 9 and 11, each blade 30a-30e Back plate 26 On the fringes 36 Each blade tapers upwards from the center to the center of the cone. 30a-30e The bottom surface of the first end 52 From the second end 54 Extends to the first end 52 is adjacent to the conical center and the second end 54 is adjacent to the outer surface. 54 Preferably, the back plate 26 The second side of 34 When measured from the first end 52 For example, in one embodiment, the first end 52 Back plate 26 and about 3.17 inches from the second end 54 Back plate 26 However, the first end is 5 inches from the 52 and the second end 54 Back plate26 Note that the distance from the rotor 16 When the size of the first end is changed, the height change of the first and second longitudinal ends can be changed accordingly. 52 and the second end 54 The difference in height between the first and second ends is about 58%. 54 The height of the first end 52 58% higher than the height of

[0029] blade 30a-30e The exterior 48 can be seen at least from Figures 3, 4, 6, 7, 9 and 11. 48 is preferably rectangular, and the rotor 16 Rotation axis of A Specifically, as shown in FIG. 9 and FIG. 11, 48 Back plate 26 As shown in Figure 4, the outer surface of the housing 14 The particles extend generally parallel to the inner surface of the housing and are spaced a predetermined distance therefrom. 14 so that it can be disposed between the inner surface of the

[0030] Additionally, as shown in FIG. 50 is the outer 48 and a 75 degree angle β and back plate 26 The second side of 34 Lines parallel to L and an angle of about 15 degrees θ Such a tapering forms a first end 52 Height H1 Larger, second end 54 Height H2 Smaller Backplate 26 The second side of 34 The height of the cone-shaped center is 28 Thus, in one embodiment, a conical center 28has a height of 4.27 inches. So, as you can see, the cone-shaped center 28 Height H3 is the second end 54 At approximately 83% of the height of the first end 52 However, the height of the cone is about 38% larger than that of the 28 Height H3 may be of any suitable height.

[0031] Therefore, as can be seen, each blade 30a-30e The height of the rotor 16 On the suction side of the rotor 16 Center of 28 From outer diameter or back plate 26 On the fringes 36 Such a configuration improves swirl for improved fluid intake and creates clearance for larger particle size. 30a-30e The height of the fluid outlet 20 Directly extruded into the outlet 20 Height or outlet 20 The outer blade height is also kept close to the outer diameter of the housing, if desired, while maintaining the same dimensions. Such a configuration reduces leakage, recirculation and pressure loss. The tapered blade height also contributes to reducing torque and therefore power consumption compared to having a uniform blade height from the center to the outer diameter. The outer blade height can also be adjusted to fit the housing while maintaining the same dimensions, if desired. 14 Discharge outlet 20 The diameter of the slit may be changed in proportion to the diameter of the slit.

[0032] As shown in Figure 4, each blade 30a-30e Housing 14 Generally, the blade is spaced a predetermined distance from the 30a-30e and housing 14 The gap between the rotor and the rotor is kept at an additional 10-15% of the largest grain size estimated to be present in the material. 16 are the blades in the rotor 30a-30e This allows for the passage of particles of significant size while reducing wear on the filter.

[0033] Five Blades 30a-30e A rotor having 16 is the preferred number of blades to reduce swirl formation and recirculation between the rotor blades. Too few blades can create turbulence and may not be able to generate the necessary pressure differential for higher flow rates. Too many blades can reduce clearance and allow larger size particles to pass through the pump. 10 This may prevent the flow of fluid through the rotor, reducing the volume of fluid allowed for an ideal flow rate. 16 A part of the flow having a suitable amount and size of particles enters the housing. 14 The blade may have any suitable number of blades through which the

[0034] The embodiments described herein are significantly better able to handle lower suction pressures and subsequent cavitation due to gentler flow lines than conventional systems, thereby reducing Net Positive Suction Head (NPSH). This improves the suction performance of the pump and reduces the cavitation phenomenon and pump 10 Reduce the possibility of damage to the

[0035] As can be appreciated, the pump embodiments described herein do not rely on the centrifugal pumping principle of conventional pumps. Instead of the low tolerance impeller of conventional pumps, the pumps described herein use a concave rotor of a particular geometry to generate a tornado-like vortex of the fluid or slurry. That is, a vortex pump operates on the tornado principle. Vortex Pumps and Rotors 16 The tornado formed by the pump rotor 16 Generates a very powerful and synchronized central column of flow from the pump inlet to the pump inlet. 18 From pump outlet 20 This creates a low pressure back swirl flow into the pump. This action also creates a negative pressure area near the pump seal. The negative pressure allows the pump to have zero leakage.

[0036] Further open rotor designs described herein include an inlet 18 All materials that enter the outlet are safely discharged. 20 The pump has high tolerances that allow it to pass through a large amount of solids and debris without clogging the pump. In one embodiment, the pump can pump slurries with high viscosity and specific gravity and / or up to 70% solids by weight.

[0037] Concave Rotor 16 The configuration also creates a swirl flow which keeps abrasive material away from critical pump components. Such a configuration extends pump life and reduces pump wear.

[0038] Rotor 16 and housing 14 The tolerance between allows the passage of significantly larger objects in a centrifugal pump. For example, the tolerance range is 1 to 9 inches for a 2 inch to 10 inch vortex pump.

[0039] The embodiments described herein may have additional advantages such as low maintenance, minimal downtime, low cost of ownership, and no need for steel high pressure pipelines.

[0040] The vortex pump is based on the principle of liquid tornado action, such as a synchronized vortex column along the center of the suction pipe that induces agitation and mixing of the solid particles and the liquid, so that a suction is created that is strong enough to create a pressure difference for the solid particles to move upward into the housing or volute and then discharge as desired. Such a vortex flow is formed by the pressure difference caused by the rotor and the housing or volute. 14 The vortex flow is enhanced by the turbulent flow patterns in the rotor and suction pipe. The vortex flow is enhanced by the presence of solid particles which increase the inertial force of the fluid. The formation of vortex flow depends on suspended solid particles creating suction. Unlike conventional vortex pumps, the rotor 16The vortex pump drives the fluid directly through the pump without slippage. The vortex pump utilizes the motion of particles and the wake induced by these solid particles to create a vortex flow and induce suction. Thus, the efficiency is 7-10% better than conventional vortex pumps in terms of horsepower. The vortex flow generated by the vortex pump ensures continuous movement of the mixture, which provides excellent de-agglomeration ability and the power to pump very high concentrations of solids up to 70% by weight and very high viscosity fluids.

[0041] Drive motor 12 are conventional components well known in the art. Because drive motor 12 is well known in the art, its structure will not be described or illustrated in detail herein. Rather, it will be apparent to one of ordinary skill in the art from this disclosure that the components may be any type of structure and / or programming that may be used to implement the present invention.

[0042] [General explanation of terms] In understanding the scope of the present invention, the term "comprise" and its derivatives used herein are intended to be open ended terms expressing the presence of the mentioned features, elements, components, groups, integers and / or steps, and do not exclude the presence of other unexpressed features, elements, components, groups, integers and / or steps. The above also applies to words having similar meanings such as "include", "have" and its derivatives. Furthermore, when the terms "portion", "part" or "element" are used in the singular, they may have a dual meaning of singular or plural. Furthermore, as used herein to describe the above embodiment, the following directional terms "rear", "top" and "bottom", as well as any other similar directional terms, refer to such directions of the vortex pump. Thus, these terms used to describe the present invention should be interpreted in relation to the vortex pump only.

[0043] The term "configured" as used herein to describe a component, section or portion of a device includes hardware and / or software that is structured and / or programmed to perform a desired function.

[0044] As used herein, terms of degree such as "substantially," "about," and "approximately" refer to a reasonable amount of deviation from the modified term such that the end result is not appreciably altered.

[0045] Although only selected examples have been chosen to illustrate the invention, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the scope of the invention as defined in the appended claims. For example, the size, shape, location or orientation of the various components can be changed as necessary and / or desired.

[0046] Components shown directly connected or in contact with one another may have intermediate structures disposed therebetween. The function of one element may be performed by two, and vice versa. Structures and functions of one embodiment may be adopted in other embodiments. Not all advantages need simultaneously be present in a particular embodiment. All features inherent from the prior art, either alone or in combination with other features, including the structural and / or functional concepts embodied by such features, should be considered by the applicant as a description of a separate and distinct invention. Accordingly, the foregoing description of embodiments in accordance with the present invention is provided for purposes of illustration and not for purposes of limitation of the present invention as defined by the appended claims and equivalents thereof.

Claims

1. 1. A pump rotor configured to be mounted within a housing of a pump, the housing having an inlet for allowing fluid to enter the housing, and an outlet positioned 90 degrees offset from the inlet for discharging the fluid outside the housing; The pump rotor is A hub having a rotation axis extending toward the inlet; a back plate having a flat surface; a plurality of blades extending from the hub in a radial direction of the pump rotor and disposed on the plane of the backplate such that the discharge opening is tangential to the pump rotor; each of the plurality of blades has an outer surface substantially parallel to the axis of rotation of the hub and a bottom surface opposite the backplate, and a first end adjacent to the hub and a second end remote from the hub, the bottom surface is spaced from the inner surface of the housing to form a gap between the housing and the blade through which particles in the fluid can pass, the height from the plane to the bottom surface at the first end is smaller than the height from the plane to the bottom surface at the second end, the bottom surface extends along a radial direction of the pump rotor between the first end adjacent to the hub and the second end remote from the hub and has a planar shape, and is open in the radial direction between adjacent second ends; The pump rotor, wherein the blades are configured to create a vortex flow of the fluid from the inlet toward a central portion of the hub and to push the fluid directly in a circumferential direction of the pump rotor toward the outlet.

2. 2. The pump rotor of claim 1, wherein said backplate extends the entire length of each of said plurality of blades.

3. 2. The pump rotor of claim 1, wherein the plurality of blades defines a radial diameter, the radial diameter defined by the plurality of blades being within a range of 0.3 to 1.0 times a diameter of the backplate.

4. 2. The pump rotor of claim 1, wherein said hub is conical.

5. 5. The pump rotor of claim 4, wherein the hub cone apex defines an angle of 40 degrees.

6. 2. The pump rotor of claim 1, wherein a central portion of said hub has a height from said plane that is greater than a height of said first end and less than a height of said second end.

7. 1. A pump rotor configured to be mounted within a housing of a pump, the housing having an inlet for allowing fluid to enter the housing, and an outlet positioned 90 degrees offset from the inlet for discharging the fluid outside the housing; The pump rotor is A hub having a rotation axis extending toward the inlet; a back plate having a flat surface; a plurality of blades extending from the hub in a radial direction of the pump rotor and disposed on the plane of the backplate such that the discharge opening is tangential to the pump rotor; each of the plurality of blades has an outer surface substantially parallel to an axis of rotation of the hub, a first end adjacent the hub and a second end remote from the hub, the first end having a first height from the plane and the second end having a second height from the plane, the first height being less than the second height; each of the plurality of blades includes a planar bottom surface extending along a radial direction of the pump rotor between the first end and the second end, the bottom surface and the outer surface forming an angle of 75 degrees, the bottom surface being spaced from an inner surface of the housing to form a gap between the housing and the blade that allows particles in the fluid to pass therethrough, and adjacent second ends are open in the radial direction; The pump rotor, wherein the blades are configured to create a vortex flow of the fluid from the inlet toward a central portion of the hub and to push the fluid directly in a circumferential direction of the pump rotor toward the outlet.

8. 2. The pump rotor of claim 1, wherein said first end has a first width and said second end has a second width, said first width being less than said second width.

9. 2. The pump rotor of claim 1, wherein said outer surface is rectangular.

10. A pump comprising: a housing having an inlet for allowing a fluid to enter the housing and an outlet positioned 90 degrees offset from the inlet for discharging the fluid outside the housing; a pump rotor disposed within the housing; The pump rotor is A hub having a rotation axis extending toward the inlet; a back plate having a flat surface; a plurality of blades extending from the hub in a radial direction of the pump rotor and disposed on the plane of the backplate such that the discharge opening is tangential to the pump rotor; each of the plurality of blades has an outer surface substantially parallel to the axis of rotation of the hub, a bottom surface opposite the backplate, and a first end adjacent to the hub and a second end remote from the hub, the bottom surface being spaced from the inner surface of the housing to form a gap between the housing and the blade through which particles in the fluid can pass, the height from the plane to the bottom surface at the first end being smaller than the height from the plane to the bottom surface at the second end, the bottom surface extending along a radial direction of the pump rotor between the first end adjacent to the hub and the second end remote from the hub and having a planar shape, the bottom surface being open in the radial direction between adjacent second ends, The pump, wherein the blades are configured to create a vortex flow of the fluid from the inlet toward a central portion of the hub and to push the fluid directly in a circumferential direction of the pump rotor toward the outlet.

11. The pump of claim 10 , wherein the backplate is constructed and arranged to prevent fluid leakage between the pump rotor and the housing.

12. 11. The pump of claim 10, wherein the hub is conical and configured to allow laminar flow movement toward the outlet.

13. 13. The pump of claim 12, wherein the apex of the hub cone defines an angle of 40 degrees.

14. 11. The pump of claim 10, wherein the height of the second end is substantially similar to the height of the outlet.

15. 11. The pump of claim 10, wherein the plurality of blades defines a radial diameter, the radial diameter defined by the plurality of blades being within a range of 0.3 to 1.0 times a diameter of the backplate.

16. 11. The pump of claim 10, wherein the central portion of the hub has a height from the plane that is greater than a height of the first end and less than a height of the second end.

17. A pump comprising: a housing having an inlet for allowing a fluid to enter the housing and an outlet positioned 90 degrees offset from the inlet for discharging the fluid outside the housing; a pump rotor disposed within the housing; The pump rotor is A hub having a rotation axis extending toward the inlet; a back plate having a flat surface; a plurality of blades extending from the hub in a radial direction of the pump rotor and disposed on the plane of the backplate such that the discharge opening is tangential to the pump rotor; each of the plurality of blades has an outer surface substantially parallel to an axis of rotation of the hub, a first end adjacent the hub and a second end remote from the hub, the first end having a first height from the plane and the second end having a second height from the plane, the first height being less than the second height; each of the plurality of blades includes a planar bottom surface extending along a radial direction of the pump rotor between the first end and the second end, the bottom surface and the outer surface forming an angle of 75 degrees, the bottom surface being spaced from an inner surface of the housing to form a gap between the housing and the blade that allows particles in the fluid to pass therethrough; and adjacent second ends are open in the radial direction; The pump, wherein the blades are configured to create a vortex flow of the fluid from the inlet toward a central portion of the hub and to push the fluid directly in a circumferential direction of the pump rotor toward the outlet.

18. 11. The pump of claim 10, wherein the first end has a first width and the second end has a second width, the first width being less than the second width.

19. The pump of claim 10, wherein the outer surface is rectangular.

20. 1. A pump rotor configured to be mounted within a housing of a pump, the housing having an inlet for allowing fluid to enter the housing, and an outlet positioned 90 degrees offset from the inlet for discharging the fluid outside the housing; The pump rotor is A hub having a rotation axis extending toward the inlet; a back plate having a flat surface; a plurality of blades extending from the hub in a radial direction of the pump rotor and disposed on the plane of the backplate such that the discharge opening is tangential to the pump rotor; each of the plurality of blades has an outer surface substantially parallel to an axis of rotation of the hub, a first side, a second side, a first end adjacent the hub and a second end remote from the hub, the first end having a first height from the plane and the second end having a second height from the plane, the first height being less than the second height; each of the plurality of blades includes a planar bottom surface extending along a radial direction of the pump rotor between the first end and the second end, the bottom surface being spaced from an inner surface of the housing to form a gap between the housing and the blade that allows particles in the fluid to pass therethrough; the first and second sides are planar and extend between the first end adjacent the hub and the second end remote from the hub, the gap being open in the radial direction between adjacent second ends; The pump rotor, wherein the blades are configured to create a vortex flow of the fluid from the inlet toward a central portion of the hub and to push the fluid directly in a circumferential direction of the pump rotor toward the outlet.

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