Pump comprising an impeller body arranged in an inclined cone

Abstract

The present application discloses a pump, which comprises an impeller, wherein the impeller has a hub base and an impeller body. The impeller body comprises at least one eccentric vertex and a base which is concentric with respect to the impeller rotation axis.

Description

Technical Field

[0001] Fluid pumps are used in many applications where the fluid being pumped contains debris, particles, fibrous matter and other solid matter. For example, in sewage or raw water applications, the water contains a variety of wastes. Typically, a conventional fluid pump includes a vaned impeller with blades extending from the center of a rotating shaft so that when rotated, the fluid is propelled through the fluid system. In some applications, conventional impeller designs have been modified in an attempt to prevent the pump from clogging during operation.

[0002] Pumping liquids with high solids content causes conventional impeller pumps to clog, requiring regular cleaning, maintenance and repair. Another problem that arises with such pumps is cavitation, which is the formation of bubbles in the liquid being pumped, which form in the relatively low pressure area around the impeller. When the bubbles collapse, shock waves are generated, which can cause severe damage to the impeller and pump casing. Bladeless impellers have been developed in response to the clogging problem, however conventional bladeless impeller designs still have various drawbacks.

[0003] In some prior art pumps, an impeller for a non-clogging pump is disclosed. The impeller has a conical hub with a single spiral blade, which is arranged asymmetrically to reduce the risk of clogging around the hub. In practice, the asymmetrical arrangement of the single blade leads to hydraulic imbalance and vibrations. Moreover, in practice, such pumps are still prone to significant clogging.

[0004] In another prior art pump, a bladeless impeller for a non-clogging pump is disclosed. The impeller has a hollow tubular body to maximize throughflow and reduce clogging. It has been found that this impeller exhibits very low pump efficiency.

[0005] Therefore, there is a need for a pump that exhibits significantly less clogging without affecting pump efficiency. Summary of the invention

[0006] The object of the present invention is achieved by a pump comprising an impeller having a hub with an impeller body. The impeller body comprises: a base concentric with the impeller rotation axis; and at least one eccentric apex.

[0007] With such a pump, the risk of clogging is significantly reduced. The inflowing liquid does not impact any leading edge of a blade or vane or similar obstruction. The design disclosed herein was found to provide a significant improvement in pump efficiency compared to conventional non-clogging pump types.

[0008] Another advantage of the pump is that a straight linear inflow is not required and that a linear inflow is not impeded by turbulence in the inflow. This makes it possible to position the pump a short distance downstream of a bend in the supply line.

[0009] In a particular embodiment, the pump comprises a tubular sleeve having an upstream open end and a downstream open end, the downstream open end defining an annular flow opening together with the hub. The impeller body extends into the sleeve, wherein the eccentric vertex is adjacent to the inner surface of the sleeve. The sleeve can be connected to the impeller body, for example to one or more vertices. Alternatively, the sleeve can be configured as a wear ring separate from the impeller, wherein there is a gap between the sleeve and one or more vertices. For example, such a gap can be about 0.001 times the diameter.

[0010] The sleeve may, for example, have a flared shape with a larger diameter at the annular outflow opening and a smaller diameter at the level of one or more vertices. In some cases, the flared shape may be, for example, conical or trumpet-shaped. Alternatively, the sleeve may be cylindrical or have any other suitable tubular shape, allowing the impeller to rotate around the impeller rotation axis in the pump chamber during pump operation. The sleeve is coaxial with the impeller rotation axis. The impeller rotation axis is the rotation axis of the impeller during normal operation of the pump.

[0011] For example, the impeller body may include one or more oblique cones, each of which defines one of the vertices. The one or more oblique cones have an oblique cone axis and a cone diameter that increases from the apex to the base relative to the oblique cone axis. The diameter can increase linearly or nonlinearly, for example, exponentially, to form a concave or convex cone surface. The concavity or convexity of the cone surface can be adjusted for hydraulic optimization. The cone axis is typically linear, but can also be curved and / or have sections that are angled to each other.

[0012] In certain embodiments, the impeller body has blades extending between the apex and the base. The blades may extend, for example, radially and straightly or helically from the apex to the base. If the impeller body has two or more vertices, each vertex may be connected to a blade of similar size and shape extending from the apex to the base. If one or more vertices are adjacent to the inner surface of the sleeve, one or more blades have no leading edge exposed to the inflow, resulting in minimal or no clogging.

[0013] Alternatively, good results are obtained if the impeller body has a trailing edge in an annular outflow opening between the sleeve and the hub base at a distance from a radial plane passing through the apex. The trailing edge may be part of a blade or an impeller body and may be provided with a surface that gradually spirals or coils downward from the apex or one of the apex to form a respective trailing edge. If the impeller body has more than one apex, the impeller body may be provided with a surface that spirals or coils downward from each apex to the associated trailing edge. The helix angle projected at the hub base may be less than 180 degrees. In some forms, the surface may spiral downward from the apex around the impeller body at a helix angle of between 180 degrees and 270 degrees. In some forms, the surface may spiral downward from the apex around the impeller body at a helix angle greater than 270 degrees.

[0014] At least one eccentric vertex and the rear edge are arranged on a first plane, at least one eccentric vertex and the center point of the hub are arranged on a second plane, and an angle between the first plane and the second plane may be an acute angle.

[0015] The ends of the blades at the hub base may, for example, extend over the entire width of the annular flow opening, ie from the edge of the sleeve to the opposite part of the hub base.

[0016] Good results are obtained if the impeller comprises at least two vertices, for example two or more oblique cones. For example, the impeller may be provided with two oblique cones, for example two oblique cones of the same size and shape and arranged symmetrically with respect to the impeller's axis of rotation. Alternatively, the impeller has three or more such conical hubs.

[0017] The base of the hub is typically circular, but other cross-sectional profiles may be used.

[0018] In some embodiments, the impeller includes at least one oblique cone, and the at least one oblique cone is dune-shaped. In some forms, the eccentric apex is shaped as a dune top, and the rear side of the at least one oblique cone includes: an inwardly curved cutout extending from the at least one apex to the hub and on the front of the at least one oblique cone; a groove-like groove spiraling from the at least one eccentric apex to the hub.

[0019] Some embodiments provide a pump including an impeller having a hub with an impeller body. The impeller may include a hub base concentric with respect to the impeller rotation axis. The impeller may also include at least one oblique cone having an eccentric apex, the at least one oblique cone extending upward from the hub base.

[0020] In some forms, at least one oblique cone is dune-shaped. In some forms, the eccentric apex is shaped as a dune top, the rear side of at least one oblique cone includes an inwardly curved cutout extending from the eccentric apex to the base of the hub; and a groove-like groove extends spirally from the eccentric apex to the base of the hub on the front side of at least one oblique cone. In some forms, the impeller body includes a plurality of oblique cones, each of which is formed on a cone axis that extends through a center point of the hub base and a corresponding eccentric apex. In some forms, at least one oblique cone is adjacent to and slightly offset from the inner surface of the sleeve.

[0021] In some embodiments, the impeller body forms a ridge extending from an eccentric apex to a hub base, the ridge being sized and shaped to maintain a substantially constant offset distance from the inner surface over the entire length of the ridge throughout a full 360 degree rotation of the impeller. In some forms, the sleeve is flared and radially symmetrical in a manner corresponding to the rotational path of the impeller body.

[0022] The impeller is particularly useful in applications with centrifugal radial flow pumps, but can also be used in axial flow pumps or mixed flow pumps, or any other suitable type of pump. The pump can be, for example, a non-clogging pump for sewage, a fish-friendly pump for a pumping station or a pump for transporting freshly caught fish. The impeller is also suitable for use in turbines or as a propeller for ships.

[0023] The present invention is further explained with reference to the accompanying drawings showing exemplary embodiments. These and other features of the present disclosure will become more apparent from the following description of illustrative embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a top elevation view of a centrifugal pump;

[0025] Figure 2 It is along Figure 1 The line 2-2 section Figure 1 A side partial cross-sectional view of a centrifugal pump;

[0026] Figure 3A is a side elevational view of one embodiment of an impeller;

[0027] Figure 3B It is cut along the central vertical plane Figure 3A A side partial cross-sectional view of the rear half of the impeller;

[0028] Figure 4A is a side view of another embodiment of an impeller;

[0029] Figure 4B yes Figure 4A An isometric top elevation view of an impeller with the sleeve removed for clarity;

[0030] Figure 5A is a side elevational view of yet another embodiment of an impeller;

[0031] Figure 5B yes Figure 5A A side elevation view of an impeller with the casing removed for clarity;

[0032] Figure 5C yes Figure 5B A top elevation view of the impeller;

[0033] Fig. 6A is a side elevational view of another embodiment of an impeller;

[0034] Figure 6B It is cut along the central vertical plane Fig. 6A A side partial cross-sectional view of the rear half of the impeller;

[0035] Fig. 7A yes Fig. 6A and Figure 6B An isometric view of an impeller with the sleeve removed for clarity;

[0036] Figure 7B yes Fig. 6A and Figure 6B A side elevation view of an impeller with the sleeve removed for clarity;

[0037] Figure 7C yes Fig. 6A and Figure 6B Another side elevation view of the impeller of wherein the sleeve is removed for clarity;

[0038] Fig.7D yes Fig. 6A and Figure 6B A top elevation view of an impeller of , wherein the sleeve is removed for clarity;

[0039] Fig. 7E yes Fig. 6A and Figure 6B Another side elevation view of the impeller of wherein the sleeve is removed for clarity;

[0040] Fig. 8A is a side elevational view of another embodiment of an impeller;

[0041] Figure 8B It is cut along the central vertical plane Fig. 8A A side partial cross-sectional view of the rear half of the impeller;

[0042] Fig.9A yes Fig. 8A and Figure 8B A side elevation view of an impeller with the sleeve removed for clarity;

[0043] Fig. 9B yes Fig. 8A and Figure 8B An isometric view of an impeller with the sleeve removed for clarity;

[0044] Fig. 9C yes Fig. 8A and Figure 8B Another side elevation view of the impeller of wherein the sleeve is removed for clarity;

[0045] Fig.9D yes Fig. 8A and Figure 8B A top elevation view of an impeller of , wherein the sleeve is removed for clarity;

[0046] Fig. 10A is a top elevation view of yet another embodiment of an impeller;

[0047] Fig. 10B yes Fig. 10A Isometric view of the impeller;

[0048] Fig.11A is a side elevational view of yet another embodiment of an impeller;

[0049] Fig. 11B yes Fig.11A A side elevation view of an impeller;

[0050] Fig. 11C yes Fig.11A A top elevation view of the impeller;

[0051] Fig.11D yes Fig.11A Isometric view of the impeller;

[0052] Fig. 12A is a side elevational view of another embodiment of an impeller;

[0053] Fig. 12B yes Fig. 12A Isometric view of the impeller;

[0054] Fig. 12C yes Fig. 12A Another isometric view of the impeller; and

[0055] Fig.13 Shown with Fig. 10A and Fig. 10B The performance of the impeller is compared to that of prior art impellers.

[0056] Corresponding reference numerals indicate corresponding parts throughout the several views.Although the drawings represent embodiments of the present disclosure, the drawings are not necessarily drawn to scale and certain features may be exaggerated to better illustrate and explain the embodiments of the present disclosure. DETAILED DESCRIPTION

[0057] Before explaining any embodiment of the present invention in detail, it should be understood that the present invention is not limited in its application to the construction details and component arrangements set forth in the following description or shown in the following drawings. The present invention can have other embodiments and can be practiced or executed in various ways. Furthermore, it should be understood that the words and terms used herein are for descriptive purposes and should not be considered restrictive. The use of "including", "comprising" or "having" and its variants in this article is intended to cover the items listed thereafter and their equivalents and additional items. Unless otherwise specified or limited, the terms "install", "connect", "support" and "couple" and their variants are widely used and include direct and indirect installation, connection, support and connection. In addition, "connect" and "couple" are not limited to physical or mechanical connections or connections.

[0058] The following discussion is proposed to enable those skilled in the art to construct and use embodiments of the present invention. Various modifications to the illustrated embodiments will be apparent to those skilled in the art, and the general principles herein may be applied to other embodiments and applications without departing from embodiments of the present invention. Therefore, embodiments of the present invention are not intended to be limited to the illustrated embodiments, but to conform to the widest scope consistent with the principles and features disclosed herein. The following detailed description will be read with reference to the accompanying drawings, in which similar elements in different figures have similar reference numerals. The accompanying drawings, which are not necessarily drawn to scale, depict selected embodiments and are not intended to limit the scope of embodiments of the present invention. Those skilled in the art will recognize that the examples provided herein have many useful alternatives and fall within the scope of embodiments of the present invention.

[0059] The present invention generally relates to a pump having an impeller including a hub having an impeller body typically surrounded by a sleeve or shroud, the pump being particularly useful for pumping liquids such as wastewater or other slurries including solids including fibrous matter.

[0060] Figure 1 and Figure 2 A centrifugal non-clogging pump 1 is depicted, which has a pump housing 2, an impeller 3 enclosed in a pump chamber 4 of the pump housing 2, and a drive shaft 5 for driving the impeller 3. The pump chamber 4 has an axially oriented inlet 6 on its suction side and a circumferential volute 7 connected to a radially oriented outlet 8 on its pressure side. Each impeller embodiment disclosed herein can be integrated in a centrifugal non-clogging pump, e.g. Figure 1 and Figure 2Pump 1 is shown. In some forms, the outlet 8 may be configured to point tangentially from the circumferential volute 7. In some forms, the outlet 8 may point axially from the circumferential volute 7 towards the inlet 6 or towards the drive shaft 5.

[0061] Figure 3A and Figure 3B Shown with Figure 1 and Figure 2 The pump 1 is used together with a first embodiment of an impeller 103 . Figure 3A and Figure 3B The impeller 103 in the embodiment comprises an impeller body 104 which comprises a single oblique cone. During pump operation, the impeller body 104 pushes the liquid from the suction side to the pressure side of the pump 1 similarly to the blades or vanes of a vane impeller.

[0062] In the drawings, the oblique cone is shown with a triangular grid hatching, but the impeller body 104 is generally provided as a solid structure with a smooth surface. The impeller 103 has a circular hub base 106 at the bottom of the impeller body 104. The impeller 103 also includes a flared sleeve or shroud 107 that is concentric with the hub base 106 and spaced apart from the hub base 106 along the rotation axis X. The impeller 103 rotates about the rotation axis X during operation.

[0063] The impeller body 104 is arranged as an oblique cone along an oblique cone axis C and terminates at an eccentric apex 108. The circular hub base 106 of the impeller body 104 is concentric with the impeller rotation axis X. The oblique cone axis C intersects the impeller rotation axis X at the center point of the hub base 106. The impeller body 104 is adjacent to and surrounded by the inner surface of the sleeve 107. The apex 108 can be connected to the inner surface near the upstream edge 113 of the flared sleeve 107. In this way, the impeller body 104 and the sleeve 107 form an integral part and rotate together within the housing 2 of the pump 1 during operation.

[0064] In an alternative embodiment, the sleeve 107 may be spaced apart from the impeller body 104, wherein the clearance between the apex 108 and the inner surface of the sleeve 107 is minimized. In the spaced apart configuration, the sleeve 107 is fixed within the housing 2 of the pump 1, and the impeller 103 rotates within the sleeve 107. The inner surface of the sleeve 107 may be smooth, curved, and radially symmetrical in a manner corresponding to the rotational path of the impeller body 104 about the impeller rotation axis X.

[0065] exist Figure 3A and Figure 3B In the embodiment of the present invention, the flared sleeve 107 is trumpet-shaped, having an open upstream end 110 and an open downstream end 111, the open downstream end 111 facing the hub base 106. The open upstream end 110 provides a fluid passage and forms a connection with the pump inlet 6 (such as Figure 1 A. Figure 1 B) and is coaxial with the impeller rotation axis X. The sleeve 107 has a downstream edge 112 that defines a downstream open end 111. The downstream edge 112 has a larger diameter than the upstream edge 113 that defines the open upstream end 110. The downstream edge 112 of the sleeve 107 and the circumference of the hub base 106 define an annular outflow opening 114, thereby allowing the liquid being pushed to flow into the volute 7 (as shown in FIG. Figure 1 A and Figure 1 B).

[0066] Figure 4A and Figure 4B Another embodiment of an impeller 203 is shown. The impeller 203 has an axis of rotation X, about which an impeller body 209 provided in the form of an oblique cone rotates during operation. The impeller body 209 extends along an oblique cone axis C and has an eccentric apex 208. The circular hub base 206 of the impeller body 209 is concentric with the impeller axis of rotation X, and the oblique cone axis C intersects the impeller axis of rotation X at the center point of the hub base 206. The impeller body 209 is surrounded by the inner surface of the sleeve 207. In some forms, the apex 208 is connected to the inner surface 207 near the upstream edge 213 of the expanded sleeve 207. In some forms, the apex 208 is separated from the inner surface by a minimized gap. The sleeve 207 is trumpet-shaped, having an open upstream end 210 with an upstream edge 213 and an open downstream end 211 with a downstream edge 212, the open downstream end 211 facing the hub base 106.

[0067] The impeller body 209 is provided with a blade 214 that extends from the eccentric apex 208 to the hub base 206 and at least partially spirals around the impeller body 209. In some forms, the blade 214 spirals around the impeller body less than 180 degrees. In some forms, the blade 214 can spiral downward from the apex 208 around the impeller body 209 at a spiral angle between 180 degrees and 270 degrees. In some forms, the blade 214 can spiral downward from the apex 208 around the impeller body 209 at a spiral angle greater than 270 degrees. The blade 214 forms a trailing edge 215 that can bridge the downstream edge 212 of the sleeve 207 and the hub base 206. In the illustrated embodiment, the trailing edge 215 is parallel to the impeller rotation axis X. One longitudinal side of the blade 214 can be attached to the inner surface of the sleeve 207 over its entire length, and the other longitudinal side of the blade 214 can be attached to the surface of the impeller body 209 over its entire length.

[0068] In some forms, the vanes 214 are not attached to the inner surface of the sleeve 207, but are immediately adjacent to and slightly offset from the inner surface. In this separated configuration, the sleeve 207 is fixed to the housing 2 ( Figure 1A. Figure 1 B) and the impeller 203 rotates within the sleeve 207. In some forms, the size and shape of the blades 214 are designed to maintain a substantially constant offset distance from the inner surface along the entire length of the blades 214 over the entire 360 ​​degree rotation of the impeller 203. The inner surface of the sleeve 207 can be smooth, curved, and radially symmetrical in a manner corresponding to the rotational path of the impeller body 209 about the impeller rotation axis X. Figure 4B The impeller body 209 and blades 214 are shown without the sleeve 207 .

[0069] FIG. 5A to FIG. 5C A further exemplary embodiment of an impeller 303 is shown. The impeller 303 has an impeller body 309 and a sleeve 307, which is similar to the sleeves 107, 207 of the embodiments disclosed above. Figure 5B and Figure 5C 3 and 4 show a side view and a top view of an impeller body 309 without a sleeve 307. The impeller body 309 is provided in the form of two oblique cones 320, each of which has a shape similar to Figure 3A and 4A The oblique cone shape of the impeller body 104, 209 in the embodiment of the present invention. The two cones 320 share a concentric base and are substantially identical in size and shape. The cone 320 has relatively inclined cone axes C, C'. As a result, the impeller body 309 has two symmetrically arranged eccentric vertices 308. The impeller 303 has an axis of rotation X, about which the impeller body 309 rotates during operation. The oblique cone axes C and C' both intersect the impeller rotation axis X at the center point of the hub base 306. The circular hub base 306 of the impeller body 309 is concentric with the impeller rotation axis X. The oblique cone 320 is surrounded by the inner surface of the sleeve 307. The vertex 308 can be connected to the inner surface of the flared sleeve 307 near the upstream edge 313.

[0070] From each eccentric vertex 308, a blade 314 spirals downward to a base to form a trailing edge 315. In some forms, the trailing edge is arranged in the same plane as the center point of the hub base 306. The two blades 314 are arranged and shaped symmetrically with respect to the impeller rotation axis X. The two blades 314 are similar to Figure 4A307 and the hub base 306, and the trailing edge 315 may at least partially spiral around the corresponding oblique cone 320. In some forms, the trailing edge 315 spirals less than 180 degrees around the impeller body 309. In some forms, the trailing edge 315 may spiral downward from the vertex 308 around the impeller body 309 at a spiral angle between 180 degrees and 270 degrees. In some forms, the trailing edge 315 may spiral downward from the vertex 308 around the impeller body 309 at a spiral angle greater than 270 degrees. In the illustrated embodiment, the trailing edge 315 is parallel to the impeller rotation axis X. One longitudinal side of the blade 314 may be attached to the inner surface of the sleeve 307 over its entire length, while the other longitudinal side of the blade 314 is attached to the surface of the impeller body 309 over its entire length.

[0071] In some forms, the vanes 314 are not attached to the inner surface of the sleeve 307, but are immediately adjacent to and slightly offset from the inner surface. In this separated configuration, the sleeve 307 is fixed to the housing 2 ( Figure 1 A, 1B) and the impeller 303 rotates within the sleeve 307. In some forms, the blades 314 are sized and shaped to maintain a substantially uniform offset distance from the inner surface along the entire length of each blade 314 over a full 360 degree rotation of the impeller 303. The inner surface of the sleeve 307 can be smooth, curved, and radially symmetrical in a manner corresponding to the rotational path of the impeller body 309 about the impeller rotation axis X.

[0072] Fig. 6A and Figure 6B Yet another embodiment of an impeller 403 is shown having an impeller body 409 arranged as a single oblique cone 420. A ridge 415 of the impeller body 409 extends between the surface of the impeller body 409 and the inner surface of the sleeve 407. In this embodiment, the ridge 415 forms part of the conical surface of the impeller body 409 and spirals downward from the apex 408 to the downstream edge 412 of the sleeve 407 and the hub base 411 at point 430 to form a trailing edge 417.

[0073] The impeller 403 has an axis of rotation X about which the impeller body 409 rotates during operation. The circular hub base 411 of the oblique cone 420 is concentric with the impeller axis of rotation X. The oblique cone 420 is surrounded by the inner surface of the sleeve 407. The apex 408 can be connected to the inner surface of the flared sleeve 407 near the upstream edge 413. The inner surface of the sleeve 407 can be shaped to correspond to the ridge 415 to facilitate connection between the entire length of the ridge 415 and the inner surface of the sleeve 407.

[0074] In some forms, the ridge 415 is not attached to the inner surface of the sleeve 407, but is immediately adjacent to and slightly offset from the inner surface. In this spaced-apart configuration, the sleeve 407 is fixed to the housing 2 ( Figure 1 A, 1B) and the impeller 403 rotates within the sleeve 407. In some forms, the ridge 415 is sized and shaped to maintain the same offset distance from the inner surface along the entire length of the ridge 415 over the entire 360 ​​degree rotation of the impeller 403. The inner surface of the sleeve 407 can be smooth and radially symmetrical in a manner corresponding to the rotational path of the impeller body 409 about the impeller rotation axis X.

[0075] Figure 7A-7E The impeller body 409 is shown without the sleeve 407. Figure 7B and 7C As shown, the oblique cone 420 has: an outer oblique height portion 417, which can be connected to the inner surface of the sleeve 407; and an inner oblique height portion 418, which extends between the apex 408 and a point 419 on the circumference of the hub base 411. The oblique cone 420 is more specifically in the shape of a sand dune, and the apex 408 is formed as a dune top. The outer oblique height portion 417 is located on the back side 422 of the dune, and the inner oblique height portion 418 is located on the front side 424 of the dune. On the back side 422 of the dune, starting from the vicinity of the apex 408, the oblique cone 420 includes an inwardly curved cutout portion 426, which surrounds the oblique cone 420 and extends all the way along the length of the ridge 415. The cutout portion 426 can correspond to the inner surface of the flared sleeve 407 in size and shape. On the front side 424 of the oblique cone 420 , a groove-like slot 428 spirals downward from the apex 408 along the length of the ridge 415 .

[0076] The inner inclined height portion 418, the outer inclined height portion 417 and the vertex 408 are all coplanar and arranged on a radial plane A (see Fig.7D ). Vertex 408 and point 430 are arranged on plane B, which extends in the direction of axis X. Angle α between plane A and plane B can be a non-zero acute angle. In some forms, angle α is substantially equal to 50 degrees. If desired, larger or smaller angles between plane A and plane B can also be used. During pump operation, the impeller moves along the direction of the impeller. Fig.7D The direction R of rotation is shown. Figure 7B and 7C It is a side elevation view from the opposite side parallel to plane A.

[0077] 8A to 9D An impeller 503 is shown having an impeller body 509 including two oblique cones 510. The impeller 503 is similar to Figure 1 and Figure 2 The impeller 3 shown. Furthermore, the shape of the oblique cone 510 is similar to Fig. 6A and Figure 6B The single oblique cone 420 of the embodiment shown in FIG. Two oblique cones 510 are located at diametrically opposite positions on the impeller 503 and are of the same size but merged where they intersect each other. Each oblique cone 510 has an outer oblique height portion 517 that can be connected to the inner surface of the sleeve 507 and an inner oblique height portion 518 that extends between the apex 508 and the circumference of the hub base 541.

[0078] The oblique cone 510 is dune-shaped and each vertex 508 is shaped as a dune top. The outer inclined height portion 517 is located on the back side 522 of the dune and the inner inclined height portion 518 is located on the front side 524 of the dune. Starting from the vicinity of the vertex 508, the oblique cone 510 includes an inwardly curved cutout portion 526 that surrounds each oblique cone 510 along the length of the ridge 515 on the back side 522 of the dune. The size and shape of the cutout portion 526 can correspond to the inner surface of the flared sleeve 507. On the front side 524 of each oblique cone 510, a groove-like groove 528 spirals down from the vertex 408 along the length of the ridge 515. The two oblique cones 510 share the same concentric hub base 541 and have eccentric vertices 508 that are symmetrically arranged relative to the impeller rotation axis X. The two vertices 508 are arranged on the same plane as the center point of the hub base 541.

[0079] and Fig. 6A and Figure 6B Similar to the impeller 403 in FIG. 5 , the flared sleeve 507 is trumpet-shaped, having a downstream edge 512 of a larger diameter than an upstream edge 544. The downstream edge 512 of the sleeve 507 and the circumference of the hub base 541 define an annular flow opening 546. The ridges 515 may bridge the downstream edge 512 of the sleeve 507 and the hub base 541. For example, each ridge 515 may be attached to the inner surface of the sleeve 307 over its entire length.

[0080] In some forms, the ridge 515 is not attached to the inner surface of the sleeve 507, but is immediately adjacent to and slightly offset from the inner surface. In this spaced-apart configuration, the sleeve 507 is fixed to the housing 2 ( Figure 1 A, 1B) and the impeller 503 rotates within the sleeve 507. In some forms, the ridge 515 is sized and shaped to maintain substantially the same offset distance from the inner surface along the entire length of the ridge 515 over the entire 360 ​​degree rotation of the impeller 503. The inner surface of the sleeve 507 can be smooth and radially symmetrical in a manner corresponding to the rotational path of the impeller body 409 about the impeller rotation axis X.

[0081] Both impeller bodies 509 have a conical surface which is twisted to form a ridge 515 in the outflow opening 546 at a distance from a radial plane passing through the apex 508. The two ridges 515 are located at diametrically opposed positions of the impeller 503. The impeller bodies 509 are bladeless and vaneless, wherein the ridges 515 are formed by a spiral extension of the surface of the corresponding oblique cone 510. During operation of the pump, the impeller moves along the Fig.9D The direction R of rotation is shown.

[0082] Fig. 10A and Fig. 10B An impeller 603 similar to impeller 503 with a structural variation is shown. Impeller 603 rotates about an impeller rotation axis X, and impeller 603 includes two opposing inclined cones 620 in an impeller body 609, each inclined cone 620 having a ridge 615 spiraling downward from an apex 608. However, impeller 603 also includes a dome 630 formed in the center of impeller body 609, where the two inclined cones 620 merge together. Dome 630 can smooth the edge formed by merging the two inclined cones 620 to form impeller body 609. Furthermore, in some embodiments, dome 630 is a cover that connects impeller body 609 to a drive shaft of a centrifugal non-clogging pump (such as pump 1 ( Figure 1 , Figure 2 ) of the removable part.

[0083] FIG. 11A to FIG. 11D An impeller 703 according to various embodiments is shown. The impeller 703 has an impeller body 703 formed as a single oblique cone 720. A ridge 715 of the impeller body 409 extends between the surface of the impeller body 409 and the inner surface of a sleeve (not shown). In this embodiment, the ridge 715 forms part of the conical surface and spirals around the outer circumference of the hub base 711. The ridge 715 remains substantially the same height as the oblique cone 720 along its entire length. The impeller 703 has an axis of rotation X about which the impeller body 709 rotates during operation. The circular hub base 711 of the oblique cone 720 is concentric with the impeller axis of rotation X.

[0084] FIG. 12A to FIG. 12CAn impeller 803 according to one embodiment of the present invention is shown. The impeller 803 has an axis of rotation X, about which an impeller body 809 formed as an oblique cone rotates during operation. The impeller body 809 extends along an oblique cone axis C and has an eccentric vertex 808. The circular hub base 806 of the impeller body 809 is concentric with the impeller axis of rotation X, and the oblique cone axis C intersects the impeller axis of rotation X at the hub base 806 at the center point of the hub base 806. The impeller body 809 is surrounded by the inner surface of a sleeve 807. The sleeve 807 is trumpet-shaped and has an open upstream end 810 with an upstream edge 813, an open downstream end 811 with a downstream edge 812, and the open downstream end 811 faces the hub base 806.

[0085] The impeller body 809 is provided with blades 814 extending from an eccentric apex 808 to a hub base 806. The blades 814 form a trailing edge 815 extending perpendicularly away from the impeller body 809. The blade tip 830 extends away from the apex 808 along an oblique cone axis C. The blades 814 may bridge the downstream edge 812 of the sleeve 807 and the hub base 806. In the embodiment shown, the trailing edge 815 is parallel to the impeller rotation axis X. One longitudinal side of the blade 814 may be attached to the inner surface of the sleeve 807 over its entire length, while the other longitudinal side of the blade 814 is attached to the surface of the impeller body 809 over its entire length.

[0086] In some forms, the vanes 814 are not attached to the inner surface of the sleeve 807, but are immediately adjacent to and slightly offset from the inner surface. In this separated configuration, the sleeve 807 is fixed to the housing 2 ( Figure 1 A. Figure 1 B) and the impeller 803 rotates within the sleeve 807. In some forms, the size and shape of the blade 814 are designed to remain offset from the inner surface by substantially the same distance along the entire length of the blade 814 over the entire 360 ​​degree rotation of the impeller 803. The inner surface of the sleeve 807 can be smooth, curved, and radially symmetrical in a manner corresponding to the rotational path of the impeller body 809 about the impeller rotation axis X.

[0087] Example

[0088] The following non-limiting examples are provided for illustrative purposes only. Fig.13 The graph shows data collected according to the ISO9906 gr.2B hydraulic performance test. Impeller A is a prior art impeller, Nijhuis HMFr1-60.70S, model number L839115, which is a three-piece design with a diameter of approximately 690mm, a rotation speed of 745rpm, and is optimized for sewage applications (large free channel and optimized blade leading edge). Test impeller B is based on the above Fig. 10Aand Fig. 10B An impeller of an embodiment is described.

[0089] Impeller A is used to design 4x Nijhuis brand VMFAr1-60.70 pumps for wastewater applications. The discharge and suction dimensions of the pump are approximately 610mm each and the impeller diameter is approximately 690 mm. The speed of the pump is controlled by a VFD with a maximum speed of 745-750rpm. The flow rate at the best efficiency point is approximately 15,000 GPm and the head at the best efficiency point is approximately 17 meters.

[0090] Impeller B is used to design 4x Nijhuis brand VMFAr1-60.70 pumps for wastewater applications. The discharge and suction dimensions of the pump are approximately 610mm each and the impeller diameter is approximately 690mm. The speed of the pump is controlled by a VFD with a maximum speed of 745-750rpm. The flow rate at the best efficiency point is approximately 15,000 GPm and the head at the best efficiency point is approximately 17 meters.

[0091] exist Fig.13 The performance of impeller A and impeller B under essentially the same pumping conditions is plotted and depicted in FIG. Fig.13 As shown, the difference in structure of impeller B from prior art impeller A results in improved pump performance. More specifically, it has been shown that both the efficiency and (anti-)clogging performance of impeller B are outstanding and superior to prior art impellers. Fig.13 , but impellers of other embodiments were also tested and obtained results substantially similar to those of impeller B, resulting in better efficiency and anti-clogging performance than previously known impellers.

[0092] Those skilled in the art will appreciate that, although the present invention has been described above in conjunction with specific embodiments and examples, the present invention is not necessarily so limited, and many other embodiments, examples, uses, variations and deviations from the embodiments, examples and uses are intended to be covered by the appended claims. The entire disclosure of each patent and publication cited herein is incorporated by reference, as if each such patent or publication was individually incorporated herein by reference. Various features and advantages of the present invention are set forth in the following claims.

Claims

1. A centrifugal pump comprising an axially oriented inlet, a radially oriented outlet and an impeller, wherein the impeller comprises: a base concentric with the axis of rotation of the impeller; and An impeller body is formed as at least one oblique cone having an eccentric apex, the at least one oblique cone extending from a base.

2. The centrifugal pump according to claim 1, further comprising a tubular sleeve having an upstream open end and a downstream open end, wherein the downstream open end defines an annular outflow opening together with the base, in, The impeller body extends into the tubular sleeve, wherein the eccentric apex is proximate to an inner surface of the tubular sleeve.

3. The centrifugal pump according to claim 2, wherein: The eccentric apex is connected to an inner surface of the tubular sleeve.

4. The centrifugal pump according to claim 2, wherein: The tubular sleeve has a flared shape with a larger diameter at the annular outflow opening and a smaller diameter at the inflow opening.

5. The centrifugal pump according to claim 4, wherein: The flared shape is a trumpet shape.

6. The centrifugal pump according to claim 1, wherein: The impeller body has at least one blade extending between the eccentric apex and the base.

7. The centrifugal pump according to claim 2, wherein: The impeller body includes at least one trailing edge.

8. The centrifugal pump according to claim 7, wherein: The at least one rear edge is positioned in the annular outflow opening and between the tubular sleeve and the base.

9. The centrifugal pump according to claim 8, wherein: The impeller body has at least one blade spiraling from the eccentric apex to the trailing edge.

10. The centrifugal pump according to claim 8, wherein: The eccentric apex and the rear edge are arranged on a first plane, the eccentric apex and a center point of the base are arranged on a second plane, and an angle between the first plane and the second plane is an acute angle.

11. The centrifugal pump according to claim 1, wherein: The impeller body comprises at least two eccentric vertices, wherein the two eccentric vertices are symmetrically arranged with respect to a rotation axis of the impeller.

12. The centrifugal pump according to claim 1, wherein: The base has a circular shape.

13. The centrifugal pump according to claim 1, wherein: The at least one oblique cone includes a ridge spiraling downward from the eccentric apex to the base.

14. The centrifugal pump according to claim 13, wherein: A groove-like slot is formed on the front side of the ridge.

15. A pump, comprising an impeller, the impeller having an impeller body, wherein the impeller comprises: a base concentric with the axis of rotation of the impeller; and at least one oblique cone having an eccentric apex and a ridge, the at least one oblique cone extending from the base, wherein the ridge spirals downward from the eccentric apex to the base, the ridge does not extend beyond the outer circumference of the base, and an inwardly curved cutout portion surrounds the at least one oblique cone and extends along the length of the ridge.

16. The pump according to claim 15, wherein The impeller body includes a plurality of oblique cones, each of which has a corresponding eccentric vertex and is formed on a cone axis, and the cone axis extends through a center point of the base and the corresponding eccentric vertex.

17. The pump according to claim 15, wherein The at least one oblique cone is adjacent to the inner surface of the sleeve and is offset relative to the inner surface of the sleeve.

18. The pump according to claim 17, wherein The ridge is sized and shaped to maintain an offset distance from the inner surface of the sleeve along the length of the ridge throughout a full 360 degree rotation of the impeller.

19. The pump according to claim 17, wherein The sleeve is trumpet-shaped and radially symmetrical in a manner corresponding to the rotational path of the impeller body.

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