CN113309734B - Semi-open impeller for controlling clearance leakage of centrifugal pump - Google Patents
Semi-open impeller for controlling clearance leakage of centrifugal pump Download PDFInfo
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- CN113309734B CN113309734B CN202110652977.1A CN202110652977A CN113309734B CN 113309734 B CN113309734 B CN 113309734B CN 202110652977 A CN202110652977 A CN 202110652977A CN 113309734 B CN113309734 B CN 113309734B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2261—Rotors specially for centrifugal pumps with special measures
- F04D29/2266—Rotors specially for centrifugal pumps with special measures for sealing or thrust balance
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2261—Rotors specially for centrifugal pumps with special measures
- F04D29/2272—Rotors specially for centrifugal pumps with special measures for influencing flow or boundary layer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/24—Vanes
- F04D29/242—Geometry, shape
- F04D29/245—Geometry, shape for special effects
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a semi-open impeller for controlling the clearance leakage of a centrifugal pump, which is positioned between a pump shell and a pump cover and comprises a rear cover plate (1), blades (2), surface textures (4), groove parts (5), an inlet pipe (9), a pressure surface (21) and a suction surface (22), and is characterized in that: the blade top of blade includes concave part (5), first blade top (23), second blade top (24), and first blade top, second blade top are located the both sides of concave part respectively, and first blade top and/or second blade top have surface texture (4), and surface texture is bionical microstructure, and bionical microstructure includes the little protruding texture of crescent, and the arrangement in blade top surface of the little protruding texture of a plurality of crescent according to the rectangle array rule. The impeller structure has the characteristics of increasing the friction between leakage flow and the top of the impeller so as to reduce clearance leakage and improve or even eliminate reverse flow.
Description
Technical Field
The invention relates to the technical field of centrifugal pumps, in particular to a semi-open impeller for controlling gap leakage of a centrifugal pump, and specifically relates to a semi-open impeller for controlling gap leakage of a centrifugal pump blade top by using a surface texture and a groove part.
Background
The semi-open impeller centrifugal pump has the advantages of convenient maintenance, long operation time, high efficiency and the like, and is widely applied to the fields of national defense, aerospace, civil use and the like. The blades of the impeller directly determine the performance of the centrifugal pump, and play a vital role in the energy conversion process of the centrifugal pump, so the design of the blades of the centrifugal pump is particularly important.
Due to the existence of the blade tip gap (blade tip gap), under the pressure gradient action of the pressure surface and the suction surface of the blade, complex flows such as blade tip leakage flow and leakage vortex cavitation are formed near the blade tip gap, and the flow state in the impeller of the centrifugal pump can be obviously changed. The tip leakage flow near the blade tip area accelerates the formation of reverse flow, and then develops to the impeller upstream, and a large amount of cavitation bubbles appear near the backflow vortex center in the inlet pipe, produce low frequency pressure pulsation, influence the performance, life and the operating stability of pump.
Therefore, researchers have conducted a great deal of research to control the phenomena of leakage flow and leakage backflow of the tip clearance, and have preliminarily proposed some ideas and methods with certain positive effects. For centrifugal pump leakage flow and loss, under design conditions, the efficiency reduction is almost linear with the change of blade tip clearance, so the efficiency reduction is generally controlled by adjusting the clearance between the blade top and the pump body, but the blade tip clearance cannot be infinitely small, and the proper small clearance is higher than the efficiency without the clearance. For reducing the influence of the countercurrent on the running stability of the impeller, the groove technology proposed by people is widely applied, such as J-shaped grooves and U-shaped grooves, but the groove technology is suitable for mixed flow pumps and axial flow pumps and is not suitable for centrifugal pump structures.
The surface texture is widely researched at present and is mainly used for improving the surface tribological performance, regular shapes such as micro grooves or micro bulges with certain shapes are processed on the surface of a friction pair, the regular shapes are proved to be effective means for improving the tribological performance, and the regular shapes have development prospects when being applied to the increase of a centrifugal pump impeller and the friction of fluid. Therefore, a semi-open impeller for controlling the leakage of the clearance at the top of the centrifugal pump blade by using a surface structure and a groove part is provided for solving the problems.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a semi-open impeller for controlling the gap leakage of the blade top of a centrifugal pump by using a surface texture and a groove part, and the semi-open impeller structure has the characteristics of increasing the friction between the leakage flow and the top of the impeller so as to reduce the gap leakage and improve or even eliminate the counter flow; the groove part structures (the first arc-shaped part (arc part), the second arc-shaped part (arc part), the drainage channel and the arc-shaped groove) on the surface of the blade top can change the local flow structure and the leakage flow direction, and prevent liquid flow from directly rushing to the next flow channel, so that the impact of the fluid flow on the blade is reduced; the circumferential groove structure arranged on the outer side of the inlet pipe of the impeller provides a channel which moves quickly along the axial direction for leakage flow, the absolute flow angle close to the rear cover plate is reduced, the upstream trend of the countercurrent is inhibited, and the flow state at the inlet of the centrifugal pump can be improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a semi-open impeller for controlling centrifugal pump clearance leaks, semi-open impeller is located between pump case (6) and pump cover (7), it includes back shroud (1), blade (2), surface texture (4), concave part (5), import pipe (9), pressure surface (21), suction surface (22), the back shroud is discoid, a plurality of blades are along circumference evenly distributed on the back shroud, the blade is along radially extending to arrange and near the blade is straight blade, import pipe is located near the radial inboard and the radial inner of blade of a plurality of blades extends to import pipe periphery, the blade outer end extends to the back shroud outward flange, top of the leaf clearance (8) have between the top of the blade and the pump case, the blade includes relative pressure surface, the suction surface, its characterized in that: the blade top of blade includes concave part (5), first blade top (23), second blade top (24), and first blade top, second blade top are located the both sides of concave part respectively, and first blade top and/or second blade top have surface texture (4), and surface texture is bionical microstructure, and bionical microstructure includes little protruding texture of crescent moon type, and the arrangement in blade top surface of the little protruding texture of a plurality of crescent moon types is according to the rectangle array rule.
Further, the crescent cusp bulge of the surface texture (4) faces the suction surface.
Furthermore, the groove portion (5) comprises a first arc-shaped portion (25) and a second arc-shaped portion (26), the first arc-shaped portion and the second arc-shaped portion are arranged in a centrosymmetric mode and are tangent at the joint of the first arc-shaped portion and the second arc-shaped portion, the first arc-shaped portion protrudes upwards and is close to one side of the pressure surface, and the second arc-shaped portion sinks downwards and is close to one side of the suction surface.
Further, be equipped with drainage channel (27) in first arc portion (25) or inside below, drainage channel communicates both ends about first arc portion respectively, and drainage channel is the arc passageway, and drainage channel (27) are used for guiding the vortex of first arc portion right-hand member to flow to the left end, also follow drainage channel's pressure surface side direction suction surface lateral flow way promptly to join with the backward flow of second arc portion department, join with the backward flow along the flow state of backward flow.
Furthermore, arc-shaped grooves (28) are formed in the surface of the second arc-shaped portion (26), extend to the left end and the right end of the second arc-shaped portion respectively, and are arranged corresponding to the drainage channel; in the radial direction of the blade (2), a plurality of flow guide channels (27) and arc-shaped grooves (28) are arranged in an array type along the radial direction.
Furthermore, a plurality of circumferential grooves (3) are arranged on the outer side of the inlet pipe (9), the circumferential grooves and the inlet pipe are concentric circles, and the plane of the circle is parallel to the plane of the rear cover plate (1).
Further, the axial height of the blade (2) or impeller decreases with increasing distance from the impeller inlet.
Further, the blades (2) are unequal-thickness blades, and the thickness of the blades is gradually reduced from the radial inner end to the radial outer end.
Further, in order to process the surface texture (4), the material is made of alloy material or ultrahigh molecular weight polyethylene; the surface texture is textured by laser technology.
The invention has the beneficial technical effects that:
(1) the bionic microtexture of the blade top surface is characterized in that the raised texture is mainly used for generating resistance to leakage flow by increasing the friction between the leakage flow and the blade top surface, so that the blade top gap leakage between a centrifugal pump shell and a centrifugal impeller is reduced. The surface texture is a textured friction surface with a friction increasing effect, so that the friction coefficient can be improved, the wear rate can be reduced, and the service life of the centrifugal impeller can be prolonged; and the leakage flow flows through the process of 'surface texture-arc groove (groove part) -surface texture', so that the leakage flow is blocked by three times, and a good effect of inhibiting the leakage flow can be achieved.
(2) The groove part structures (the first arc-shaped part (arc part), the second arc-shaped part (arc part), the drainage channel and the arc groove) on the blade top surface can change the local flow structure and the leakage flow direction, and prevent the liquid flow from directly rushing to the next flow channel, thereby reducing the impact of the fluid flow on the blade. The jet strength of the blade tip clearance jet in the clearance passage can be equivalent to or even slightly larger than the strength of the conventional leakage flow, and the conventional leakage flow can be hindered/inhibited to a certain degree.
(3) Meanwhile, a circumferential groove structure arranged on the outer side of the inlet pipe of the impeller provides a channel which moves quickly along the axial direction for leakage flow, the absolute flow angle close to the rear cover plate is reduced, the upstream trend of the countercurrent is inhibited, and the flow state at the inlet of the centrifugal pump can be improved.
Drawings
FIG. 1 is a three-dimensional block diagram of an impeller in an embodiment of the present invention;
FIG. 2 is a schematic view of a projection structure of an axial plane of an impeller according to an embodiment of the present invention;
FIG. 3 is an enlarged schematic structural view of a crescent surface texture (bionic microstructure) according to the present invention;
FIG. 4 is a schematic diagram of a vortex generating structure of a concave portion of an impeller blade tip according to an embodiment of the present invention;
FIG. 5 is a schematic view of a vortex generated by a recessed portion of an impeller blade tip according to another embodiment of the present invention;
FIG. 6 is a prior art typical impeller internal vortex flow diagram;
FIG. 7 is a flow chart of the vortex inside the impeller according to an embodiment of the present invention;
FIG. 8 is a graph comparing impeller performance curves according to the present invention.
In the figure: the pump comprises a rear cover plate 1 (a blade plate), blades 2, a circumferential groove 3, a surface texture 4 (a bionic microstructure), a groove portion 5, a front pump shell 6, a rear pump cover 7, a blade top gap 8, an inlet pipe 9, a pressure surface 21, a suction surface 22, a first blade top 23, a second blade top 24, a first arc-shaped portion 25 (an arc-shaped portion), a second arc-shaped portion 26 (an arc-shaped portion), a drainage channel 27 and an arc-shaped groove 28.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-4, a semi-open impeller for controlling centrifugal pump clearance leakage, the semi-open impeller is located between pump case 6 and pump cover 7, it includes back shroud 1, blade 2, surface texture/bionic microstructure 4, groove 5, inlet pipe 9, pressure surface 21, suction surface 22, back shroud 1 is discoid, a plurality of blades 2 evenly distributed on back shroud 1 along circumference, blade 2 radially extends to arrange and blade 2 is straight blade, inlet pipe 9 is located the radial inboard of a plurality of blades 2 and blade 2 radial inner extends to near inlet pipe 9 periphery, blade 2 outer end extends to back shroud 1 outward flange, have tip clearance 8 between the tip of blade 2 and pump case 6, blade 2 includes relative pressure surface 21, suction surface 22, its characterized in that: the blade top of the blade 2 comprises a groove portion 5, a first blade top 23 and a second blade top 24, the first blade top 23 and the second blade top 24 are respectively located on two sides of the groove portion 5, the first blade top 23 and/or the second blade top 24 are/is provided with a surface texture 4, the surface texture 4 is a bionic microstructure, the bionic microstructure comprises a crescent-shaped micro-protrusion texture, and a plurality of crescent-shaped micro-protrusion textures are regularly arranged on the surface of the blade top according to a rectangular array.
As shown in fig. 3, the surface texture 4 of the impeller blade top adopts the bionics principle, and the bionic microtexture capable of increasing friction is designed and arranged on the blade top surface. The bionic microtexture 4 mainly refers to a xanthium crescent hook angle, the crescent cusp bulge of the bionic microtexture faces the suction surface, and structural optimization beneficial to increasing of friction coefficient is carried out. The bionic surface texture 4 is arranged in a micro-convex texture mode, and the micro-convex texture is regularly arranged on the top surface of the blade according to a rectangular array.
Texturing is carried out by adopting a laser technology, and crescent surface textures (crescent micro-convex structures) with reasonable appearance and size parameters are processed on the blade top surface of the impeller by using laser through processing steps of processing a template, transferring a pattern sample, processing a substrate and the like in sequence. Specifically, the semi-open impeller of the centrifugal pump with the circumferential groove 3 and the blade top structure is manufactured, the inlet pipe 9 is modified and processed, then the blade is designed according to the traditional centrifugal pump blade design, and then the blade top structure of the blade is modified to process the bionic microstructure on the top surface of the blade.
Specifically, the blades 2 in the embodiment are blades of unequal thicknesses. The inlet diameter D1 of the blade and the outlet diameter D2 of the blade are 25mm and 130mm respectively in the embodiment; in the embodiment, the width of each blade is 9mm, the arc chord length of the groove part 5 at the top of each blade is 2.5mm, and the two arcs have the same radian and are symmetrically arranged; the outer side of the inlet pipe 9 in the embodiment is provided with a circumferential groove 3, the height of the projection of the circumferential groove 3 is 2mm, the width of the projection is 2mm, the number of the circumferential grooves 3 is 3, and the distance between the two circumferential grooves is 3 mm.
As shown in fig. 4, the groove portion 5 includes a first arc portion 25 (arc portion) and a second arc portion 26 (arc portion), the first arc portion 25 and the second arc portion 26 are arranged in a central symmetry manner and are tangent at a joint thereof, the first arc portion 25 is arranged to protrude upward and is close to one side of the pressure surface 21, and the second arc portion 26 is arranged to recess downward and is close to one side of the suction surface 22.
As shown in fig. 4, the leakage flow that is obstructed by the surface texture 4 but still passes through flows through the pressure surface 21, the first arc 25, flows to the suction surface 22 through its buffer action, and flows back to the blade wall, forming a vortex structure at the undercut arc/second arc 26, and changing the local flow structure and leakage flow direction of the blade, so that the flow does not directly impact the next blade flow channel, reducing the impact of the fluid flow on the blade. The jet strength of the blade tip clearance jet in the clearance passage can be equivalent to or even slightly larger than the strength of the conventional leakage flow, and the conventional leakage flow can be hindered/inhibited to a certain degree.
The leaf top surface is bionic with a microtexture 4, and macroscopically raising the microtexture to increase the friction coefficient between the leakage flow and the leaf top surface and generate resistance to the leakage flow; the microscopic crescent-shaped protrusion can block the leakage flow on the surface of the blade top, so that the concave surface of the crescent generates a tiny vortex.
The groove part 5 on the blade top surface of the blade 2 rotates along with the pump shaft of the centrifugal pump, leakage flow liquid flows through the pressure surface 21 and the arc part and flows to the blade wall of the suction surface 22 for backflow through the buffering action of the groove part and the arc part, a vortex structure is formed at the second arc part 26, and meanwhile, the local flow structure and the leakage flow direction of the blade are changed, so that liquid flow does not directly impact the flow channel of the next blade, and the impact of the fluid flow on the blade is reduced.
As shown in fig. 5, in another embodiment, a flow guiding channel 27 is disposed below the inner/inner portion of the first arc-shaped portion 25, the flow guiding channel 27 is communicated with the left end and the right end of the first arc-shaped portion 25, and the flow guiding channel 27 is an arc-shaped channel, and the flow guiding channel 27 is used for guiding the vortex flow at the right end of the first arc-shaped portion 25 to flow to the left end, that is, to flow from the pressure surface 21 side to the suction surface 22 side of the flow guiding channel 27, so as to join the backflow at the second arc-shaped portion 26, and join the backflow along the backflow flow state. The surface of second arc portion 26 is equipped with arc recess 28, and arc recess 28 extends to both ends about second arc portion 26 respectively, and the position of arc recess 28 sets up with drainage channel 27 is corresponding, and in the radial direction of blade 2, a plurality of drainage channels 27, arc recess 28 array are along radial arrangement.
The local flow structure and the leakage flow direction of the blade are further changed through the design of the flow guide channel 27 and the arc-shaped groove 28, so that liquid flow does not directly impact a next blade flow channel, and the impact of the fluid flow on the blade is reduced; the jet strength of the blade tip clearance jet in the clearance passage can be equivalent to or even slightly larger than the strength of the conventional leakage flow, and the conventional leakage flow can be hindered/inhibited to a certain degree.
A plurality of circumferential grooves 3 are arranged on the outer side of the inlet pipe 9, the circumferential grooves 3 and the inlet pipe 9 are concentric circles, and the plane of the circles is parallel to the plane of the rear cover plate 1. The number of the circumferential grooves 3 is reasonably arranged according to the length of the inlet pipe, and the diameter of the bulge of each circumferential groove 3 is 2-5 mm larger than that of the inlet pipe 9.
In order to process the surface texture 4, the material can be made of alloy material or ultrahigh molecular weight polyethylene (UHMWPE), and the material has the excellent characteristics of strong wear resistance, strong impact resistance and the like.
The vane 2/impeller axial height decreases with increasing distance from the impeller inlet. The blades 2 are unequal-thickness blades, and specifically, the thickness of the blades 2 gradually decreases from the radially inner end to the radially outer end.
Fig. 6 and 7 show the flow state before and after modification of the impeller, respectively. Under the design condition of the impeller before improvement, large vortexes exist near the outlet of each flow channel, which is caused by pressure and speed changes, and the leakage of the blade tip clearance also influences the inner flow channel to promote the inner flow channel to form the large vortexes. Particularly, the outlet area of the flow channel near the volute partition tongue is small, the vortex is more concentrated in the center of the impeller flow channel, and the vortex strength of the vortex center is higher. Such large vortices seriously affect the performance of the centrifugal pump. In the improved impeller inner flowpath flow regime of fig. 7, it can be seen that there is a significant reduction in swirl, particularly in the inner flowpath near the retention tongue, and that the large swirl becomes smaller and moves towards the impeller exit, which improves the impeller inner flowpath flow regime primarily by reducing tip leakage. Meanwhile, a circumferential groove structure arranged on the outer side of the inlet pipe of the impeller provides a channel which moves quickly along the axial direction for leakage flow, the absolute flow angle close to the rear cover plate is reduced, the upstream trend of reverse flow is inhibited, and the flow state at the inlet of the centrifugal pump can be improved.
Fig. 8 is a comparison between the impeller of the present embodiment and a general impeller head-flow curve, and it can be seen that the performance is improved at the test operating point. The impeller of the embodiment has a certain inhibiting effect on the reverse vortex, and improves the leakage flow of the impeller clearance.
The beneficial technical effects of the invention are as follows:
(1) the bionic microtexture of the blade top surface is characterized in that the raised microtexture mainly generates resistance to leakage flow by increasing the friction between the leakage flow and the blade top surface, so that the blade top gap leakage between a centrifugal pump shell and a centrifugal impeller is reduced. The surface texture is a textured friction surface with friction increasing effect, so that the friction coefficient can be improved, the wear rate can be reduced, and the service life of the centrifugal impeller can be prolonged; and the leakage flow flows through the process of 'surface texture-arc groove (groove part) -surface texture', so that the leakage flow is blocked by three times, and a good effect of inhibiting the leakage flow can be achieved.
(2) The groove part structures (the first arc-shaped part (arc part), the second arc-shaped part (arc part), the drainage channel and the arc groove) on the blade top surface can change the local flow structure and the leakage flow direction, and prevent the liquid flow from directly rushing to the next flow channel, thereby reducing the impact of the fluid flow on the blade. The jet intensity of the blade tip clearance jet flow passing through the clearance channel can be equal to or slightly larger than the conventional leakage flow intensity, and the conventional leakage flow can be hindered/inhibited to a certain extent.
(3) Meanwhile, a circumferential groove structure arranged on the outer side of the inlet pipe of the impeller provides a channel which moves quickly along the axial direction for leakage flow, the absolute flow angle close to the rear cover plate is reduced, the upstream trend of the countercurrent is inhibited, and the flow state at the inlet of the centrifugal pump can be improved.
The above-described embodiments are illustrative of the present invention and not restrictive, it being understood that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims (6)
1. The utility model provides a semi-open impeller for controlling centrifugal pump clearance leaks, semi-open impeller is located between pump case (6) and pump cover (7), it includes back shroud (1), blade (2), surface texture (4), concave part (5), import pipe (9), pressure side (21), suction surface (22), the back shroud is discoid, a plurality of blades are along circumference evenly distributed on the back shroud, the blade is along radially extending to arrange and near the blade is straight blade, import pipe is located near radial inboard and the radial inner of blade of a plurality of blades extends to import pipe periphery, the blade outer end extends to the back shroud outward flange, there is blade top clearance (8) between the blade top of blade and the pump case, the blade includes relative pressure side, the suction surface, its characterized in that: the blade top of the blade comprises a groove part (5), a first blade top (23) and a second blade top (24), the first blade top and the second blade top are respectively positioned at two sides of the groove part, the first blade top and/or the second blade top are/is provided with surface textures (4), the surface textures are bionic microstructures, the bionic microstructures comprise crescent-shaped micro-protrusion textures, and the crescent-shaped micro-protrusion textures are regularly arranged on the surface of the blade top of the blade according to a rectangular array;
The groove part (5) comprises a first arc-shaped part (25) and a second arc-shaped part (26), the first arc-shaped part and the second arc-shaped part are arranged in a centrosymmetric manner and are tangent at the joint of the first arc-shaped part and the second arc-shaped part, the first arc-shaped part is arranged in an upward protruding manner and is close to one side of the pressure surface, and the second arc-shaped part is arranged in a downward recessed manner and is close to one side of the suction surface; a drainage channel (27) is arranged in or below the first arc-shaped part (25), the drainage channels are respectively communicated with the left end and the right end of the first arc-shaped part and are arc-shaped channels, and the drainage channel is used for guiding vortex at the right end of the first arc-shaped part to flow to the left end; the surface of the second arc-shaped part (26) is provided with arc-shaped grooves (28) which respectively extend to the left end and the right end of the second arc-shaped part, and the positions of the arc-shaped grooves correspond to the drainage channel; in the radial direction of the blade (2), a plurality of flow guide channels (27) and arc-shaped grooves (28) are arranged in an array type along the radial direction.
2. A semi-open impeller for controlling clearance leakage in centrifugal pumps according to claim 1, characterised in that the crescent-shaped cusp projection of the surface texture (4) faces the suction surface.
3. A semi-open impeller for controlling the clearance leakage of centrifugal pumps according to claim 2, characterized in that the inlet pipe (9) is provided on the outside with a plurality of circumferential grooves (3) which are concentric with the inlet pipe and lie in a plane parallel to the plane of the back cover plate (1).
4. A semi-open impeller for controlling clearance leakage in centrifugal pumps according to claim 3, characterised in that the axial height of the vanes (2) or impeller decreases with increasing distance from the impeller inlet.
5. A semi-open impeller for controlling the clearance leakage of centrifugal pumps according to claim 4, characterized in that the vanes (2) are of unequal thickness and the thickness of the vanes decreases from the radially inner end to the radially outer end.
6. The semi-open impeller for controlling the clearance leakage of the centrifugal pump according to claim 5, characterized in that for machining the surface texture (4), the material is selected from alloy materials or selected from ultra-high molecular weight polyethylene; the surface texture is textured by laser technology.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110652977.1A CN113309734B (en) | 2021-06-11 | 2021-06-11 | Semi-open impeller for controlling clearance leakage of centrifugal pump |
| JP2022046609A JP2022189719A (en) | 2021-06-11 | 2022-03-23 | Semi-open type impeller for controlling clearance leakage of centrifugal pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110652977.1A CN113309734B (en) | 2021-06-11 | 2021-06-11 | Semi-open impeller for controlling clearance leakage of centrifugal pump |
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| CN113309734A CN113309734A (en) | 2021-08-27 |
| CN113309734B true CN113309734B (en) | 2022-06-28 |
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| CN117627955B (en) * | 2023-12-05 | 2024-06-11 | 吉林大学 | Emulsion breaking prevention latex pump impeller |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012172574A (en) * | 2011-02-21 | 2012-09-10 | Mitsubishi Heavy Ind Ltd | Pump device |
| CN108331784A (en) * | 2018-04-16 | 2018-07-27 | 浙江理工大学 | Centrifugal pump unshrouded impeller structure |
| CN111720175A (en) * | 2020-06-23 | 2020-09-29 | 中国科学院工程热物理研究所 | Impeller machinery movable vane top seal structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9046090B2 (en) * | 2011-10-19 | 2015-06-02 | Baker Hughes Incorporated | High efficiency impeller |
| WO2015130521A2 (en) * | 2014-02-25 | 2015-09-03 | Siemens Aktiengesellschaft | Turbine component cooling hole within a microsurface feature that protects adjoining thermal barrier coating |
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- 2021-06-11 CN CN202110652977.1A patent/CN113309734B/en active Active
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012172574A (en) * | 2011-02-21 | 2012-09-10 | Mitsubishi Heavy Ind Ltd | Pump device |
| CN108331784A (en) * | 2018-04-16 | 2018-07-27 | 浙江理工大学 | Centrifugal pump unshrouded impeller structure |
| CN111720175A (en) * | 2020-06-23 | 2020-09-29 | 中国科学院工程热物理研究所 | Impeller machinery movable vane top seal structure |
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| CN113309734A (en) | 2021-08-27 |
| JP2022189719A (en) | 2022-12-22 |
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