CN109882448B - Mixed flow pump runner chamber with arc pumping groove - Google Patents
Mixed flow pump runner chamber with arc pumping groove Download PDFInfo
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- CN109882448B CN109882448B CN201910137003.2A CN201910137003A CN109882448B CN 109882448 B CN109882448 B CN 109882448B CN 201910137003 A CN201910137003 A CN 201910137003A CN 109882448 B CN109882448 B CN 109882448B
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- 238000005086 pumping Methods 0.000 title claims abstract description 57
- 102100023190 Armadillo repeat-containing protein 1 Human genes 0.000 claims description 7
- 101000684952 Homo sapiens Armadillo repeat-containing protein 1 Proteins 0.000 claims description 7
- 230000004323 axial length Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 15
- 238000012545 processing Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000003801 milling Methods 0.000 description 3
- 210000004907 gland Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
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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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
- F04D29/688—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a mixed flow pump runner chamber with arc pumping grooves, wherein the inner wall surface of the runner chamber is a spherical surface, a plurality of arc pumping grooves are uniformly distributed on the inner wall surface along the circumferential direction, and each pumping groove is used for pumpingThe central path line of the groove is a circular arc on a radial section from the outlet end of the wheel chamberP 1 P 2The axial stretching curved surface is intersected with the inner wall surface of the runner chamber, the profile surface of the pumping groove, which is obtained by taking any point on the central trajectory line of the pumping groove as the vertical surface of the central trajectory line, is the overflowing section of the pumping groove, and the overflowing section is rectangular; when the mixed flow pump operates, the pumping grooves can increase the flow resistance, play a role in preventing the leakage flow of the blade top from flowing back from the outlet side of the impeller to the inlet side, do work on the backflow fluid with high circumferential speed like the concave blades, pump the backflow fluid from the inlet side of the impeller back to the outlet side of the impeller, reduce the leakage amount of the blade top, and further improve the hydraulic performance and the operation stability of the mixed flow pump.
Description
Technical Field
The invention belongs to the technical field of fluid machinery, and relates to a mixed flow pump, in particular to a runner chamber structure of the mixed flow pump.
Background
The mixed flow pump has the advantages of high lift, large flow and wide high-efficiency area, and can also better improve the hump phenomenon. At present, the application of a mixed flow pump relates to various aspects of agriculture, industry, municipal administration, navigation industry and the like, the internal flow of the mixed flow pump has important significance for improving the efficiency and stability of the mixed flow pump, a gap exists between the blade top of the mixed flow pump and a runner chamber, although the gap is very small, the gap can have certain influence on the whole flow channel, the pressure difference between the suction surface and the pressure surface of a blade leads fluid to pass through the gap to generate blade top gap leakage flow, the leakage flow and a main flow interact to form leakage vortex, the leakage vortex not only blocks the flow channel and influences the normal flow of the flow channel, but also can cause rotating stall, the flow stability of the mixed flow pump is reduced, and great energy loss is caused. Therefore, the reduction of the tip leakage flow and the leakage vortex plays a crucial role in the operation of the mixed flow pump.
The mixed flow pump disclosed in the document of the chinese patent application No. 201610855766.7, entitled "mixed flow pump for improving blade rim leakage flow", reduces the leakage flow by processing a "tooth" square protrusion at the blade rim, processing a "tooth" square groove at the inner wall of the runner chamber, and matching the two, but the problem that it exists is: because the thickness of the blade is thin, the tooth-shaped bulge is not easy to process, the processing difficulty is high, and when the square bulge and the square groove are mutually matched, the gap is small, the complete matching is required, the collision is not caused, the mounting difficulty is high, and the reduction of leakage flow can not be well realized. Chinese patent application No. 201610828287.6, the name is "an oblique flow pump of restraining blade top leakage flow", through at runner indoor internal wall distribution arc boss, reduce the clearance between blade wheel rim and the runner room, but this scheme is at the wall distribution boss of runner indoor arc surface, and the processing degree of difficulty is big, and can produce the swirl when the fluid flows through the boss, and the swirl can cause pressure pulsation, the reduction leakage flow that can not be fine, improves operating stability.
Disclosure of Invention
In order to effectively reduce the leakage flow of the blade top, improve the running stability of the mixed flow pump and facilitate the processing, manufacturing and installation, the invention provides the mixed flow pump runner chamber with the arc-shaped pumping groove, which is used for improving the hydraulic performance and the running stability of the mixed flow pump.
The invention adopts the following scheme for solving the problems: the inner wall surface of the runner chamber is a spherical surface, a plurality of circular arc pumping grooves are uniformly distributed on the inner wall surface along the circumferential direction, and the central trajectory line of each pumping groove is an arc on a radial section of the outlet end of the runner chamberP 1 P 2The axial stretching curved surface is intersected with the inner wall surface of the runner chamber, the profile surface of the pumping groove, which is obtained by taking any point on the central trajectory line of the pumping groove as the vertical surface of the central trajectory line, is the overflowing section of the pumping groove, and the overflowing section is rectangular.
Further, the arcP 1 P 2End point ofP 1Diameter of
The polar angle is
(ii) a EndpointP 2Diameter of
The polar angle is 60 °; circular arcP 1 P 2Radius of (2)r=（r 1+r 2）/2。
Further, the spherical radius of the inner wall surface of the runner chamber isR 1Round sphereThe center of the sphere is coincident with the center of the circle of the outlet section of the runner chamber, and the axial length of the runner chamber isHThe radius of the radial section of the inlet end of the runner chamber isR 2，
。
The invention has the beneficial effects that: when the mixed flow pump operates, after main flow fluid enters the runner chamber, because the impeller does work, the fluid pressure at the outlet side of the impeller is larger than that at the inlet side, and under the action of pressure difference, part of the fluid flows back from the outlet side of the impeller to the inlet side of the impeller along a gap (blade top gap) between the impeller and the runner chamber, so that blade top leakage flow is caused. The pumping grooves are uniformly distributed on the inner wall surface of the runner chamber, so that the flow resistance can be increased, the effect of preventing the leakage flow of the blade top from flowing back from the outlet side to the inlet side of the impeller is achieved, the backflow fluid with high peripheral speed can do work like an inwards concave blade, the backflow fluid is pumped back to the outlet side of the impeller from the inlet side of the impeller, the leakage amount of the blade top is reduced, and the hydraulic performance and the operation stability of the mixed flow pump are improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic structural diagram of a mixed flow pump with a circular arc-shaped pumping groove;
FIG. 2 is an enlarged right side view of the wheel well of FIG. 1;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a projection of the center trajectory of FIG. 2 at a section of the exit end of the wheel well;
FIG. 5 is a schematic view of the location of the vertical plane of the center trace line of the pumping groove of FIG. 2;
fig. 6 is an enlarged schematic view of the flow cross section of the pumping channel of fig. 5.
In the figure, 1 is a water inlet horn, 2 is a runner chamber, 3 is a guide vane chamber, 4 is a pump shaft, 5 is an impeller, 6 is a guide vane, 7 is an impeller nut, 8 and 9 are bolts, 10 is a flat key, 11 is a bearing gland, 12 is a bolt, 13 is a bearing, 14 is a framework oil seal, 15 is a pumping groove, 16 is a central track line of the pumping groove, 17 is an overflowing section of the pumping groove, 18 is a central line of the overflowing section, 19 is a side wall of the pumping groove, and 20 is a vertical plane of the central track line.
Detailed Description
As shown in fig. 1, the mixed flow pump includes a water inlet horn 1, a runner chamber 2, a guide vane chamber 3, a pump shaft 4, an impeller 5 and the like which are coaxially installed, an inlet section of the mixed flow pump is formed by fixedly connecting the water inlet horn 1 and the runner chamber 2 along an axial direction through a bolt 8, an outlet end of the runner chamber 2 is fixedly connected with an inlet end of the guide vane chamber 3 through a bolt 9, the pump shaft 4 is installed at a central shaft position inside the runner chamber 2 and the guide vane chamber 3, the impeller 5 and the guide vane 6 are installed on the pump shaft 4, the guide vane 6 is installed in the guide vane chamber 3, the impeller 5 is installed in the runner chamber 2, and the impeller 5 is fixed on the pump shaft 4 through a flat key 10 and an impeller nut. The guide vane 6 is coaxially mounted with the impeller 5 and rotates with the pump shaft 4. The impeller 5 is composed of blades and an impeller hub, the blades and the impeller hub are of an integral structure, and a gap is formed between the blade tops of the blades and the inner wall surface of the runner chamber 2. The guide vane 6 is internally provided with a bearing 13, the guide vane consists of a guide vane blade and a guide vane hub, the guide vane blade and the guide vane hub are of an integral structure, and the guide vane hub are fixed together through a screw 12. The bearing 13 is axially positioned through the bearing gland 11, and framework oil seals 14 are arranged at two ends of the bearing 13.
As shown in fig. 2 and 3, the inner wall surface of the wheel house 2 is a spherical surface having a spherical radius ofR 1The radial section of the outlet end of the runner chamber 2 is circular, the spherical center of the spherical surface and the center of the radial section of the outlet end of the runner chamber 2OOverlap, the axial length of the runner chamber 2 beingHThe radius of the radial section of the inlet end of the runner chamber 2 isR 2Wherein
。
A plurality of circular arc-shaped pumping grooves 15 are uniformly distributed on the inner wall surface of the runner chamber 2 along the circumferential direction, and the optimum number of the pumping grooves 15 is 6. The central trajectory line 16 of each pumping groove 15 is a space circular arc-shaped curve located on the inner wall surface of the rotor chamber 2.
As shown in FIG. 4, the center trajectory line 16 of each pumping groove 15 is on the runnerThe projection on the radial section of the outlet end of the chamber 2 is a segment of a circular arcP 1 P 2I.e. the central trajectory 16 is a circular arc on a radial section from the outlet end of the wheel chamber 2P 1 P 2The tensile curved surface along the axial direction is intersected with the inner wall surface of the runner chamber 2. On a radial section of the outlet end of the rotor chamber 2, a circular arcP 1 P 2End point ofP 1Diameter of
The polar angle is
(ii) a EndpointP 2Diameter of
The polar angle is 60 °; circular arcP 1 P 2Radius of (2)r=（r 1+r 2）/2。
As shown in fig. 5, at any point on the central track line 16 of the pumping groove 15MThe profile of the pumping channel 15 taken by the perpendicular 20 to the central track line 16 is the flow cross-section 17 of the pumping channel 15, the flow cross-section 17 being rectangular, the shorter sides of the rectangle being the sides of the side walls 19 of the pumping channel 15 and the longer sides of the rectangle being the sides of the groove base and notch of the pumping channel 15. On the flow cross section 17, in the groove width direction of the pumping groove 15, the pumping groove 15 is symmetrical about a center line 18 of the flow cross section 17, and the center line 18 of the flow cross section passes throughMThe centre of the ball of the point and runner chamber 2O. Width of pumping groove 15b=2mm, groove depthh=1mm, radius at notch isR 1I.e. equal to the spherical radius of the inner wall surface of the wheel chamber 2R 1，
The size of the flow cross section 17 of the pumping groove 15 is kept constant along the whole central track line 16 of the pumping groove 15, and the central line 18 of the flow cross section 17 always passes through the spherical center of the runner chamber 2.
The pumping grooves 15 can be obtained by means of a numerically controlled machine milling. The central trajectory line 16 of the pumping groove 15 is the travel path of the milling cutter,the direction of the line connecting the centre of the sphere of the wheel chamber 2 to each point on the central trajectory line 16, i.e. the orientation of the milling cutter at that point, mills the shape of the flow cross-section 17 in a plane perpendicular to the central trajectory line 16 of the pumping channel 15. After one pumping groove 15 is processed, the runner chamber 2 can be rotated
All the pumping grooves 15 are machined in sequence.
When the mixed flow pump is operated, the pump shaft 4 drives the impeller 5 to rotate, fluid enters the runner chamber 2 from the water inlet horn 1, under the action of the impeller 5, the fluid pressure at the outlet side of the runner chamber 2 is greater than the fluid pressure at the inlet side, under the action of the pressure difference, part of the fluid flows back from the outlet side to the inlet side of the runner chamber 2 along the gap (namely the blade top gap) between the impeller 5 and the runner chamber 2 to form blade top leakage flow, and when the blade top leakage flow enters the pumping groove 15 processed on the inner wall surface of the runner chamber 2, the blade top leakage flow also has higher circumferential speed component around the pump shaft 4 due to the driving action of the impeller 5 rotating at high speed, and the pumping groove 15 is still, so that the side wall 19 of the pumping groove 15 rotates at high speed relative to the blade top leakage flow to do work on the blade top leakage flow to increase the pressure of the blade top leakage flow, and further pumps the part of the fluid back to the outlet side of, the pumping action of the pumping groove 15 reduces the leakage amount of the blade top, and improves the hydraulic performance and the operation stability of the mixed flow pump.
Claims (1)
1. A mixed flow pump runner chamber with a circular arc pumping groove, the inner wall surface of the runner chamber (2) is a spherical surface, and the mixed flow pump runner chamber is characterized in that: a plurality of circular arc-shaped pumping grooves (15) are uniformly distributed on the inner wall surface along the circumferential direction, and the central track line (16) of each pumping groove (15) is a circular arc on a radial section of the outlet end of the runner chamber (2)P 1 P 2The axial stretching curved surface is intersected with the inner wall surface of the runner chamber (2) to obtain, the profile surface of the pumping groove (15) obtained by taking a vertical surface (20) of the central trajectory line (16) as any point on the central trajectory line (16) of the pumping groove (15) is an overflowing section (17) of the pumping groove (15), and the overflowing section (17) is rectangular; the arcP 1 P 2End point ofP 1Diameter of
The polar angle is 0 °; endpointP 2Diameter of
The polar angle is 60 °; circular arcP 1 P 2Radius of (2)r=（r 1+r 2) 2; the spherical radius of the inner wall surface of the runner chamber (2) isR 1The sphere center of the spherical surface is coincident with the circle center of the outlet section of the runner chamber (2), and the axial length of the runner chamber (2) isHThe radius of the radial section of the inlet end of the runner chamber (2) isR 2，
(ii) a The width of the pumping groove (15)b=2mm, groove depthh=1mm, and the radius of the notch is equal to the spherical radius of the inner wall surface of the runner chamber (2)R 1；
Along the whole course of a central trajectory line (16) of the pumping groove (15), the shape and the size of an overflowing section (17) of the pumping groove (15) are kept unchanged, and the central line of the overflowing section (17) passes through the spherical center of the runner chamber (2); the number of pumping grooves (15) is 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910137003.2A CN109882448B (en) | 2019-02-25 | 2019-02-25 | Mixed flow pump runner chamber with arc pumping groove |
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| CN201910137003.2A CN109882448B (en) | 2019-02-25 | 2019-02-25 | Mixed flow pump runner chamber with arc pumping groove |
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| CN109882448B true CN109882448B (en) | 2020-06-26 |
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| CN110805574B (en) * | 2019-11-12 | 2020-11-24 | 珠海格力电器股份有限公司 | Centrifugal fan volute and air conditioner |
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| CZ48394A3 (en) * | 1993-03-04 | 1994-09-14 | Abb Management Ag | Radial-flow compressor with a flow-stabilizing casing |
| EP1069315B1 (en) * | 1999-07-15 | 2007-09-12 | Hitachi Plant Technologies, Ltd. | Turbo machines |
| CN102162472A (en) * | 2011-05-03 | 2011-08-24 | 北京航空航天大学 | Multi-arc chute processing machine box |
| CN105673553A (en) * | 2016-03-18 | 2016-06-15 | 江苏大学 | Diagonal flow pump |
| CN106438475A (en) * | 2016-09-18 | 2017-02-22 | 江苏大学 | Diagonal flow pump inhibiting blade tip leakage flow |
| CN106286382A (en) * | 2016-09-27 | 2017-01-04 | 江苏大学 | A kind of mixed-flow pump improving blade rim leakage stream |
| CN206478038U (en) * | 2017-02-16 | 2017-09-08 | 河海大学 | A kind of blade wheel chamber for suppressing axial-flow pump blade tip clearance cavitation |
| CN107100886B (en) * | 2017-03-24 | 2018-11-09 | 江苏大学 | The blade wheel structure of mixed-flow pump blade rim exciting force under a kind of measurable Alford effects |
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Effective date of registration: 20240531 Address after: 230000 b-1018, Woye Garden commercial office building, 81 Ganquan Road, Shushan District, Hefei City, Anhui Province Patentee after: HEFEI WISDOM DRAGON MACHINERY DESIGN Co.,Ltd. Country or region after: China Address before: Zhenjiang City, Jiangsu Province, 212013 Jingkou District Road No. 301 Patentee before: JIANGSU University Country or region before: China |