New impeller design for submersible centrifugal drainage pumps.

Abstract

The present invention relates to an impeller (20) for use in a volute (12) that is part of a pump (10) for transporting a fluid between two predetermined locations by converting mechanical energy into fluid energy using at least one drive (11).

Description

[Technical Field]

[0001] The present invention relates to an impeller for use in a submersible pump for transporting a fluid between two predetermined locations using at least one drive to transfer mechanical energy to a working fluid, thereby increasing the total head. [Background technology]

[0002] A submersible pump is a type of pump that operates in the fluid and environment in which it is used. It primarily consists of two subassemblies: a drive unit and a hydraulic unit. The drive unit is mounted adjacent to hydraulic components called the impeller and volute. Because submersible pumps are in direct contact with the liquid, their motors have technical features such as a waterproof housing. Applications of submersible pumps include water supply, irrigation and sprinkler systems, groundwater level control and detection research, pressurizing clean or low-pollution water in heat pump applications, transporting animal waste, and transporting liquids containing solids. The impeller is responsible for the aforementioned energy transfer, which is achieved by increasing the angular momentum of the working fluid as it passes through the rotating impeller.

[0003] Patent Document 1 relates to a submersible pump designed to minimize clogging. The anti-clogging pump includes a pump body and an impeller, which includes a main plate, blades, and a central projection. Examining current pump structures reveals several problems that arise during fluid transport. One of these problems is clogging. In applications such as transporting raw organic fertilizer or various animal wastes, the presence of fibrous materials in the working fluid can reduce the pump's transport capacity. Depending on their length, these fibrous structures can wrap around the hub or leading edge of the impeller, causing several problems. First, the effective suction area is reduced, clogging the pump inlet and thereby reducing capacity. Second, the fibrous materials deform the surface of the impeller blades, causing flow separation and impeding the transfer of angular momentum. In the worst case scenario, the impeller becomes clogged and stops rotating, leading to overheating of the drive unit and system failure. With current technology, these clogging problems reduce the pump system's energy efficiency and irregular fluctuations in pumping capacity, degrading the quality of the pump system.

[0004] As a result, the problems described herein call for innovation in the related art fields. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2021 / 260974 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention relates to an impeller for use in fluid transport, which overcomes the above-mentioned drawbacks and brings new advantages to the related art.

[0007] It is an object of the present invention to provide an impeller that promotes the breakup of solid elements in a fluid.

[0008] Another object of the present invention is to provide an impeller for preventing or at least partially reducing clogging problems in submersible pumps. [Means for solving the problem]

[0009] To achieve the above-mentioned objectives and those resulting from the following detailed description, the present invention provides a novel impeller designed for use in a submersible pump. The invention is useful for transporting and pressurizing a fluid contaminated with fibrous material between two predetermined locations using at least one drive unit. Accordingly, the novelty of the present invention resides in the impeller comprising at least one hub, at least one connection unit on the hub for connecting the impeller to the drive unit, and at least one blade that rotates at least partially around the connection unit and extends along a streamline until it reaches a shroud. The blade has at least one tip on its side, which extends on a vertical axis as it moves away from the hub and slopes backward in a counterclockwise direction. The blade has a rear end that has a first angle and, together with the hub, forms a vacuum region around the blade. At least one impeller cover is provided adjacent to the volute. At least one shaped portion is formed on the impeller cover according to the surface shape of the impeller. At least one of the cutting channels has a recessed shape so that solid elements in the fluid are broken up on the molding, thereby ensuring that solid elements trapped between the impeller and the impeller cover are broken up during transport and discharged together with the fluid.

[0010] A possible embodiment of the invention is characterized in that it can consist of up to three separate blades, which increases the hydraulic efficiency of the impeller.

[0011] A possible embodiment of the invention is characterized in that the cutting channel has a predetermined curvature shape, which improves the cutting performance of the impeller and the shroud.

[0012] Another possible embodiment of the invention is characterized by six cutting channels on the shroud, which increases the cutting speed, handles the discharge of solid particles and fibrous material, and maintains a constant level of hydraulic efficiency throughout the pump. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 shows a representative perspective view of a pump in which the impeller of the present invention is positioned. [Figure 2] FIG. 2 shows a representative perspective view of the impeller of the present invention. [Figure 3] FIG. 3 shows a representative side view of the impeller of the present invention. [Figure 4] FIG. 4 shows a representative perspective view of at least one shroud cover formed from a meridian cross-section outer rotation of the impeller. DETAILED DESCRIPTION OF THE INVENTION

[0014] In this detailed description, for a better understanding of the subject matter, the subject matter of the invention is explained only by way of examples without any limiting effect.

[0015] FIG. 1 shows a representative perspective view of a pump 10 in which an impeller 20 of the present invention is positioned. The pump 10 thus transports a fluid between two predetermined locations and at least partially pressurizes the fluid during such transport. The pump 10 is preferably a submersible pump 10 known in the art. The submersible pump 10 is disposed within the fluid and is capable of moving the fluid from one location to another. For this purpose, the pump 10 is provided with at least one drive unit 11. The drive unit 11 converts electrical energy into mechanical energy for fluid transport. The pump 10 is provided with at least one volute 12 on its side, which is in contact with the fluid. The volute 12 guides the fluid while maintaining its angular momentum with a reasonable loss coefficient in a closed space. To transfer mechanical energy to the working fluid, the impeller 20 of the present invention is disposed on an axis coincident with the center of the volute 12. The impeller (20) advances the fluid by rotating about its axis of symmetry, thereby increasing the angular momentum of the fluid across the radial direction, allowing it to reach the volute (12) and be transported through the drain opening (13).

[0016] FIG. 2 shows a representative perspective view of the impeller (20) of the present invention. The impeller (20) of the present invention thus breaks down solid and fibrous materials in the transported fluid and transfers mechanical energy to the fluid, thereby preventing the pump (10) from clogging. The impeller (20) has at least one hub (21) and at least one connecting portion (22). Hereinafter, the hub (21) is assumed to have a horizontal axis (I) on its extension surface and a vertical axis (II) that intersects the extension surface perpendicularly and passes through the connecting portion (22). The hub (21) is essentially cylindrically symmetric and is formed by the rotation of an inner meridian contour around the vertical axis (II). This hub (21) provides a closed space for the volute (12), and the impeller (20) is rotated about the vertical axis (II) by the drive unit (11). The connecting portion 22 provides a connection between the impeller 20 and the drive portion 11. For this purpose, the connecting portion 22 may be provided with a threaded portion 23, by which the impeller 20 can be connected to the drive portion 11. The impeller 20 is provided with blades 30. The blades 30 comprise a plurality of blades, including a first blade 30a, a second blade 30b, and a third blade 30c. The first blade 30a, the second blade 30b, and the third blade 30c are conformal. The first blade 30a, the second blade 30b, and the third blade 30c are arranged on the hub surface at equidistant angles on the impeller 20. The shape of the blades 30 is formed by stacking multiple coplanar (meridian) flow lines between the surface of the connecting portion (hub surface) 22 and the surface of the impeller cover 40, with an angular distribution that creates a specific pressure distribution for collecting fibrous material and directing it toward the midstream line to prevent clogging between the impeller cover 40 and the volute. To this end, in a possible embodiment of the present invention, the first blade 30a, the second blade 30b, and the third blade 30c each have at least one tip 31 on their side facing the connecting portion 22. The structure of the blades 30 begins at the tip 31 of the pump 10.The tip portion 31 is in contact with the connecting portion 22 on the side facing the hub 21 and is positioned such that it moves away from the connecting portion 22 as the horizontal axis (I) and the vertical axis (II) move in opposite directions. That is, the tip portion 31 is formed by a 3D original curve that increases in value along the vertical axis (II) from the surface of the hub 21 toward the surface of the impeller cover 40, tilted backward in a counterclockwise direction (SYT). The purpose of this tilted tip curve is to create a negative pressure gradient that increases with radial distance from the hub 21 toward the impeller cover 40. The cylindrical cross-sectional shape of the tip portion 31 is elliptical.

[0017] The elliptical shape of the leading edge (31) improves performance characteristics in fluid transport and solid particle breakup. The first blade (30a), second blade (30b), and third blade (30c) are spaced apart from one another on a horizontal axis (I) around the connecting portion (22). As the first blade (30a), second blade (30b), and third blade (30c) progress from the leading edge (31) to the trailing edge (35), a shape is formed on a vertical axis (II), and the fiber structure is expected to converge on a coplanar surface with a unique angular distribution. To define this shape, a virtual streamline direction (Y) and a trailing edge (35) are defined. The streamline direction (Y) is a virtual operating parameter that curves and extends between the connecting portion (22) and the periphery of the hub (21). The unique design of the first blade (30a), second blade (30b), and third blade (30c) forms a stack of streamlines with a unique angular distribution over the length of the streamlines on the vertical axis (II), providing efficient energy transfer (10) and better handling of impurities in the working fluid (i.e., less clogging) compared to current state-of-the-art impeller (20) designs. To this end, the streamline direction is curved in a predetermined manner. The amount of curvature in the streamline direction (Y) is at its maximum level between the connection (22) and the end of the hub (21).

[0018] The first blade 30a, the second blade 30b, and the third blade 30c have at least one vacuum region 32 between them. The vacuum region 32 is located between the face of the blade 30 facing the suction eye 41 (the suction side) and the other underside of the blade 30 (the pressure side). The increase in angular momentum in the region 30 between two consecutive blades is achieved by the pressure difference between these two surfaces. This vacuum region 32 allows fluid to be drawn in, retained, and removed through the drain opening 13 as the impeller 20 rotates counterclockwise (SYT).

[0019] FIG. 3 shows a representative side view of the impeller 20 of the present invention. Thus, when viewing the impeller 20 from the side, it can be seen that the first blade 30a, the second blade 30b, and the third blade 30c each have at least one protrusion 33 as they approach the connecting portion 22. The protrusion 33 is a portion of the first blade 30a, the second blade 30b, and the third blade 30c that extends outward from the hub 21 at the fluid inlet on the volute 12. The protrusion 33 improves the suction and particle shredding characteristics of the impeller 20. The most protruding region of the protrusion 33 corresponds to the tip 31.

[0020] The cross-sectional profiles of the first, second, and third blades 30a, 30b, and 30c show that they are positioned relative to the hub 21 at a predetermined first angle 34 and a predetermined shape of the trailing edge 35. The trailing edge 35 is uniquely shaped to minimize pressure loss and center fibrous material at the trailing edge 35, preventing it from clogging at the edge of the hub 21 or at the rear of the vertical axis II, and further preventing it from clogging between the impeller cover 40 and the impeller 20. The first angle 34 and the trailing edge 35 extend along the streamline direction Y of the first, second, and third blades 30a, 30b, and 30c, and may vary with the streamline.

[0021] FIG. 4 shows a representative perspective view of at least one impeller cover 40 shaped using the same meridian cross section at the outer streamline of the impeller 20 of the present invention. The impeller cover 40 is thus positioned within the volute 12 adjacent to the impeller 20. The impeller cover 40 is provided with at least one suction eye 41, which allows fluid to be drawn into the impeller 12. The fluid entering through the suction eye 41 is energized by the impeller 20, transported to the volute 12, and connected to a line using the drain opening 13. The impeller cover 40 is provided with at least one shaped portion 42, which is located on the side of the impeller cover 40 facing the impeller 20. The shaped portion 42 is configured to fit the blade structure, protrusions 33, and connecting portions 22 of the impeller 20. This minimizes free movement of fluid trapped between the impeller 20 and the impeller cover 40, preventing leakage from the pressure side to the suction side. The shaped portion 42 has at least one cutting channel 43. The cutting channel 43 is a recessed opening in the shaped portion 42. In a preferred embodiment of the present invention, multiple cutting channels 43, specifically six, are present on the shaped portion 42. The cutting channels 43 are arranged on the shaped portion 42 in a generally curved shape following the local flow pattern. This ensures that solid particles trapped between the impeller cover 40 and the impeller 20 are compressed and cut by the rotational effect of the impeller 20.

[0022] Throughout this embodiment, the fluid drawn into the volute 12 on the pump 10 through the suction eye 41 is reliably pressurized and transported. In a possible embodiment, if solid elements (such as fibrous waste components) are present in the transported fluid, the special shapes of the first blade 30a, second blade 30b, and third blade 30c, located between the impeller 20 and the impeller cover 40, compress these solid elements and ensure that they are cut and shredded. This reliably prevents clogging of the pump 10.

[0023] The scope of protection of the present invention is defined by the appended claims and is not strictly limited to what is exemplified by this detailed description. It is obvious that a person skilled in the art can, in light of the above facts, make similar embodiments without departing from the subject matter of the present invention. [Explanation of symbols]

[0024] 10 Pump 11 Drive unit 12 Volute 13 Drain opening 20 impeller 21 Hub 22 Connection 23 Threaded section 30 blades 30a First Blade 30b Second Blade 30c Third Blade 31 Tip 32 Vacuum area 33 Protrusion 34 First Angle 35 Rear end 40 Impeller cover 41 Suction eye 42 Molding section 43 Cutting Channel (I) Horizontal axis (II) Vertical axis (SYT) Counterclockwise (Y) Streamline direction

Claims

1. 1. An impeller (20) for use in a volute (12) that is part of a pump (10) for transporting a fluid between two predetermined locations by converting mechanical energy into fluid energy using at least one drive section (11), comprising: At least one hub (21) and at least one connection part (22) on the hub (21) for connecting the impeller (20) with the drive part (11); At least one blade (30) at least partially rotates around the connecting portion (22) and extends along the streamwise direction (Y); at least one tip (31) provided on the side of the blade (30) facing the connecting portion (22), the tip (31) being provided on the impeller (20) as a protrusion (33) extending on a vertical axis (II) and inclined backward in a counterclockwise (SYT) direction as it moves away from the hub (21); a rear end (35) having a first angle (34) and forming a vacuum region (32) around the blade (30) with the hub (21); at least one impeller cover (40) provided adjacent to the volute (12); At least one molded portion (42) formed on the impeller cover (40) according to the surface shape of the impeller (20); At least one cutting channel (43) having the shape of a recess so that solid elements in the fluid are dissolved on the molding (42); Equipped with Impeller (20).

2. characterized in that it comprises a plurality of blades, including at least one first blade (30a), at least one second blade (30b), and at least one third blade (30c); The impeller (20) of claim 1.

3. The cutting channel (43) has a predetermined curved shape. The impeller (20) of claim 1.

4. characterised in that there are six cutting channels (43) on the shaped part (42), The impeller (20) of claim 1.

5. The cylindrical cross-sectional shape of the tip portion (31) is elliptical. The impeller (20) of claim 1.

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