CN212376954U - Centrifugal pump semi-open impeller with gap channel arranged on blade top - Google Patents
Centrifugal pump semi-open impeller with gap channel arranged on blade top Download PDFInfo
- Publication number
- CN212376954U CN212376954U CN202020892292.5U CN202020892292U CN212376954U CN 212376954 U CN212376954 U CN 212376954U CN 202020892292 U CN202020892292 U CN 202020892292U CN 212376954 U CN212376954 U CN 212376954U
- Authority
- CN
- China
- Prior art keywords
- blade
- clearance
- impeller
- centrifugal pump
- semi
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model discloses a clearance passageway's centrifugal pump semi-open impeller is arranged to blade top. Each blade is arranged along a spiral line segment, a plurality of clearance channels are formed in the blade top surface of each blade, the clearance channels are sequentially arranged at intervals along the radial direction of the impeller, and the quantity of the clearance channels on the blade top surface of each blade is the same; the clearance channel is a horizontal groove provided with the blade top surface of the blade, the section of the horizontal groove is in a semi-arc shape, and the central axis of the clearance channel is positioned on an arc taking the center of the shaft hole as the center of a circle; and the central axes of all clearance passages on different blades which are the same in sequence from inside to outside along the radial direction are all positioned on the same circle. The utility model discloses arrange the clearance passageway, make passageway department efflux have higher velocity of flow, hinder no passageway department and let out the leakage flow, change and let out the leakage flow direction, adjusted the blade top clearance along the change of blade entry to export, increased the blade top clearance, alleviated exit pressure differential, weaken the backward flow phenomenon, improved the hump effect of pump lift curve.
Description
Technical Field
The utility model relates to a centrifugal pump technical field especially relates to a clearance passageway's centrifugal pump semi-open impeller is arranged to blade top.
Background
The centrifugal pump mainly comprises a suction chamber, an impeller, a pressing chamber and the like. The impeller plays a crucial role in the energy conversion process of the centrifugal pump, and the blades on the impeller directly determine the performance of the centrifugal pump, so the design of the blades of the centrifugal pump is particularly important.
When the semi-open centrifugal pump operates in a low-flow process, the clearance layer can form large-area streaming, leakage vortex and other complex motions, and the internal flow and the energy transmission of the pump are greatly influenced. Meanwhile, during operation, the impact loss and the vortex loss are large, the on-way friction loss is small, the stability of a performance curve is unfavorable, a hump is easily generated, and negative effects such as vibration, noise, pressure pulsation and the like are generated on the motion of the centrifugal pump. It is therefore desirable to suppress leakage flow and reduce or eliminate humps.
At present, the leakage flow and loss of the centrifugal pump are generally controlled by adjusting the clearance between the top of the vane and the pump body. The improvement technology for the hump effect comprises the following steps: a cutting outlet front wheel disc, a radial cutting blade outlet edge and the like. In order to restrain the leakage flow of the centrifugal pump and improve the hump effect of the centrifugal pump, a semi-open impeller of the centrifugal pump with a clearance channel arranged on the top of a blade is provided.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to prior art's not enough, provide a clearance passageway's centrifugal pump semi-open impeller is arranged to blade top. The impeller structure has the characteristics of inhibiting leakage flow and weakening or eliminating a hump curve, and the whole blade top profile is obviously different from the blade top structure of the existing semi-open impeller.
The utility model adopts the following technical scheme:
the utility model discloses an impeller is located between pump case and pump cover, and the impeller includes rim plate and a plurality of blade, and the rim plate center is equipped with the shaft hole, and a plurality of blades are arranged along the circumference around the shaft hole and are fixed on the rim plate terminal surface, and every blade is arranged along the helical line section, and a plurality of clearance passageways have been seted up on the leaf top surface of every blade, and a plurality of clearance passageways set up along the radial direction interval in proper order of impeller, and the clearance passageway quantity on each blade top surface is the same.
The inner end of each blade extends to the side of the shaft hole, and the outer end of each blade extends to the edge of the wheel disc.
The clearance channel is a horizontal groove provided with the blade top surface of the blade, the section of the horizontal groove along the horizontal groove is in a semi-arc shape, namely an inwards concave semi-arc shape, and the central axis of the clearance channel is positioned on an arc taking the center of the shaft hole as the center of a circle; and the central axes of all the clearance channels which are arranged on different blades in the same order from inside to outside along the radial direction are all positioned on the same circle, and the plane of the circle is parallel to the end face of the wheel disc of the impeller.
The circle of the center line of the blade top gap channel and the circle of the inlet and the outlet of the impeller are concentric circles. The diameter of a circle where the center line of a clearance channel 1 at the top of the impeller is positioned is D, and the diameter of an inlet of the impeller is D1Outlet diameter D2The clearance channel 1 is spaced from the axial center of the shaft hole by 0.5D on the blade top surface of the blade1～0.5D2And a method of not arranging at both ends of the blade in the radial direction is adopted.
As shown in fig. 4, the clearance passage 1 centerline of the tip is thus angled to the normal leakage flow direction, which is perpendicular to the pressure face, i.e. the side of the blade. Fluid in the centrifugal pump forms jet flow at the gap channel, so that the conventional leakage flow at the position without the channel can be blocked to a certain extent, the fluid in the gap area at the position without the channel is sucked, and the leakage loss is reduced. Therefore, the average clearance of the blade top is increased, the pressure difference between the inlet and the outlet is relieved, the backflow phenomenon is weakened, and the hump effect of a pump lift curve is improved.
The clearance channel depth is the same for each blade tip surface.
The blade and the pump shell are provided with a blade top gap x, the size ratio of the maximum depth h of a gap channel of the blade to the blade top gap x is 1.0-2.5, and the size ratio of the maximum width of the gap channel to the blade top gap x is 1.0-2.5.
The size ratio of the distance s between adjacent clearance channels on the same blade to the maximum thickness delta of the blade is 2.0-3.5.
The size ratio of the distance s between adjacent clearance channels on the same blade to the maximum width d of the clearance channels is 2.0-3.0.
The number of the gap channels is n, and n is [0.5 (D)2-D1)/s]-1 rounding, D1、D2The inlet diameter and the outlet diameter of the impeller, respectively.
The utility model discloses an advantage effect lies in:
the utility model discloses a blade top surface arrangement channel structure enables the passageway department efflux and has higher velocity of flow, hinders the formation that does not have passageway department leakage flow, has hindered the leakage flow that radial pressure difference formed, has restrained the leakage backward flow.
And simultaneously, the utility model discloses an at the blade top surface arrangement access structure, adjusted the blade top clearance along the change of blade entry to export, increased blade top clearance has alleviated exit pressure difference, weakens the backward flow phenomenon, has improved the hump effect of pump lift curve.
Drawings
Fig. 1 is a schematic three-dimensional structure diagram of an impeller provided in an embodiment of the present invention;
fig. 2 is a schematic view of an axial projection of an impeller according to an embodiment of the present invention;
FIG. 3 is a top view of an impeller blade and its arrangement according to an embodiment of the present invention;
fig. 4 is a diagram illustrating the effect of the blade clearance channel on the flow of the tip clearance provided in an embodiment of the present invention.
In the figure: 1-clearance channel, 2-blade, 3-shaft hole, 4-wheel disc, 5-pump shell, 6-pump cover and 7-blade top clearance.
Detailed Description
The invention will be described in detail with reference to the following embodiments with reference to the accompanying drawings.
As shown in fig. 1, the impeller of the embodiment is located between a pump shell 5 and a pump cover 6, the impeller includes a wheel disk 4 and a plurality of blades 2, a shaft hole 3 is provided in the center of the wheel disk 4, the plurality of blades 2 are fixed on the end surface of the wheel disk 4 along the circumference around the shaft hole 3, each blade 2 is arranged along a spiral line segment, the inner end of each blade 2 extends to the side of the shaft hole 3, and the outer end of each blade 2 extends to the edge of the wheel disk 4. The water flow fluid enters from the left side of the pump shell 5 in fig. 2, passes through the vane 2 and then flows out from the shaft hole 3 of the vane 2 on the other side of the pump cover 6.
As shown in fig. 1 and 2, a plurality of clearance passages 1 are formed in the blade top surface of each blade 2, the clearance passages 1 penetrate through the blades 2 of the centrifugal pump along the approximate tangential direction, the clearance passages 1 are sequentially arranged at intervals along the radial direction of the impeller, and the number of the clearance passages 1 on the blade top surface of each blade 2 is the same. The clearance channel 1 is a horizontal groove provided with the blade top surface of the blade 2, the section of the horizontal groove along the horizontal groove is in a semi-arc shape, namely an inwards concave semi-arc shape, and the central axis of the clearance channel 1 is positioned on an arc taking the center of the shaft hole 3 as the center of a circle; and the central axes of the clearance channels 1 on different blades 2 which are the same in sequence from inside to outside along the radial direction are all positioned on the same circle, and the plane of the circle is parallel to the end surface of the wheel disc 4 of the impeller.
In concrete implementation, combine fig. 3, make the utility model discloses a centrifugal pump blade of clearance passageway is arranged to the blade top, designs according to traditional centrifugal pump blade design earlier the utility model discloses a blade carries out the modification processing to its blade top again. The clearance channels 1 of the tip surfaces of the individual blades 2 have the same depth.
As shown in FIG. 3, a blade tip clearance x7 is formed between the blade 2 and the pump casing 5, the ratio of the maximum depth h of the clearance channel 1 of the blade 2 to the size of the blade tip clearance x7 is 1.0-2.5, and the ratio of the maximum width of the clearance channel 1 to the size of the blade tip clearance x7 is 1.0-2.5. The size ratio of the distance s between adjacent clearance channels 1 on the same blade 2 to the maximum thickness delta of the blade 2 is 2.0-3.5. The size ratio of the distance s between adjacent clearance channels 1 on the same blade 2 to the maximum width d of the clearance channels 1 is 2.0-3.0. The total number of the clearance channels 1 is n, and n is [0.5D ]2-D1/s]-1 rounding, D1、D2The inlet diameter and the outlet diameter of the impeller, respectively.
The blades in the embodiment are equal-thickness blades, and the central line of the clearance channel is a section of a concentric circle of a circle where the inlet and the outlet of the blade are located. The thickness delta of the blade provided in the embodiment is 4mm, and the diameter D of the inlet of the blade1Is 46mm, and has an outlet diameter D2The diameter of the blade top clearance channel is 196mm, the blade top clearance channel is arranged in the range of 23 mm-98 mm from the axis of the blade top surface of the blade, and a method that two ends are not arranged is adopted along the radius direction. The conventional blade tip clearance x is 1mm, the maximum depth of the clearance channel is h-2 x-2 mm, and the width of the clearance channel is d- δ -4 mm. The axial section of the clearance channel is semicircular, and the radius R is 2 mm. The distance s between the gap channels is 3D 12mm, the number of channels n is 0.5 (D)2-D1)/s]The number of the gap channels arranged in the embodiment is 5, because the number of the gap channels is 5 after rounding 5.25.
As shown in fig. 4, in the semi-open impeller according to the embodiment of the present invention, the leakage flow flows from the pressure surface of the blade to the suction surface across the tip. The utility model discloses arrange the clearance passageway on the blade top surface for the efflux flow direction of passageway department keeps the contained angle with the conventional leakage flow, can hinder the conventional leakage flow to a certain extent. Meanwhile, the existence of the gap channel forms jet flow with a certain speed, and a certain injection effect is formed on other fluid in the gap area at the position without the channel, so that a part of fluid is involved in the gap channel, and the formation of leakage flow in the gap area without the channel is reduced.
In concrete implementation, clearance passageway adopts both ends not to arrange at the blade top, the utility model discloses discover in the experiment: in a semi-open impeller, inlet turbulence is exacerbated if clearance passages are initially provided directly at the inlet ends of the blades; if the clearance channel is arranged at the tail edge end, backflow is aggravated, and the distribution of relative velocity values in the clearance layer shows large fluctuation under the influence of factors such as the liquid flow impact at the tail part of the blade. This increases the hump of the head curve of the centrifugal pump, thereby allowing the arrangement of no clearance channels at the inlet and outlet ends of the vanes.
The ratio of the distance s between adjacent clearance channels to the maximum width d of the clearance channel 1 is 2.0-3.0, so that the effect of the jet entrainment of the clearance flow without the channel in the clearance channel is realized, the maximum depth of the clearance channel arranged on the surface of the blade top is 1.0-2.5 times of that of the clearance of a conventional blade, the jet intensity in the clearance channel can be equivalent to or even slightly larger than that of the conventional leakage flow, the effect of blocking the conventional leakage flow is realized, and the violent reduction of the efficiency of the centrifugal pump caused by the overlarge depth is also prevented.
The utility model discloses research experiment shows that semi-open impeller top of leaf clearance is total to press to distribute and is: there is substantially the same total pressure over the circumference along the axis. In the blade tip clearance layer, the rotation angular velocity of the fluid is relatively small, and the generated centrifugal force cannot overcome the action of radial pressure difference. Under the action of pressure difference, the liquid flows into the runner of the impeller from the volute chamber through the blade top gap to form leakage reflux. The utility model discloses the clearance passageway at impeller blade top distributes along the circumference in axle center, has hindered the leakage flow that radial pressure differential formed, has restrained special complicacy such as leakage reflux and has flowed, has improved the hump effect of centrifugal pump lift curve.
From this the utility model provides a centrifugal pump semi-open impeller because the existence of blade top clearance passageway has restrained the leakage backward flow, has increased the average clearance of blade top, has improved the hump effect of pump lift curve. The clearance channel is arranged on the surface of the blade top, high-pressure fluid of the pressure surface is led into the suction surface through the clearance channel, and meanwhile, the fluid in the clearance area is sucked in a rolling mode, so that the leakage flow of the blade top clearance is restrained, and the influence of the increase of the blade top average clearance on the pump lift and the efficiency is reduced.
The embodiment is a preferred embodiment of the present invention, but the present invention is not limited to the above embodiment, and any obvious improvement, replacement or modification which can be made by those skilled in the art without departing from the essence of the present invention belongs to the protection scope of the present invention.
Claims (8)
1. The utility model provides a clearance passageway's centrifugal pump semi-open impeller is arranged to blade top, impeller are located between pump case (5) and pump cover (6), and the impeller includes rim plate (4) and a plurality of blade (2), and rim plate (4) center is equipped with shaft hole (3), and a plurality of blade (2) are arranged along circumference around shaft hole (3) and are fixed on rim plate (4) terminal surface, its characterized in that: every blade (2) arranges along spiral line segment, and a plurality of clearance passageway (1) have been seted up on the top surface of every blade (2), and a plurality of clearance passageways (1) set up along the radial direction interval in proper order of impeller, and the clearance passageway (1) quantity on each blade (2) top surface is the same.
2. A centrifugal pump semi-open impeller with clearance passages arranged at the blade tops as claimed in claim 1, wherein: the inner end of the blade (2) extends to the side of the shaft hole (3), and the outer end of the blade (2) extends to the edge of the wheel disc (4).
3. A centrifugal pump semi-open impeller with clearance passages arranged at the blade tops as claimed in claim 1, wherein: the clearance channel (1) is a horizontal groove provided with the blade top surface of the blade (2), the cross section of the horizontal groove is in a semi-arc shape, and the central axis of the clearance channel (1) is positioned on an arc taking the center of the shaft hole (3) as the center of a circle; and the central axes of all clearance channels (1) on different blades (2) which are the same in sequence from inside to outside along the radial direction are all positioned on the same circle.
4. A centrifugal pump semi-open impeller with clearance passages arranged at the blade tops as claimed in claim 1, wherein: the depth of the clearance channel (1) on the blade top surface of each blade (2) is the same.
5. A centrifugal pump semi-open impeller with clearance passages arranged at the blade tops as claimed in claim 1, wherein: the impeller is characterized in that a blade top clearance x (7) is arranged between the blade (2) and the pump shell (5), the size ratio of the maximum depth h of the clearance channel (1) of the blade (2) to the blade top clearance x (7) is 1.0-2.5, and the size ratio of the maximum width of the clearance channel (1) to the blade top clearance x (7) is 1.0-2.5.
6. A centrifugal pump semi-open impeller with clearance passages arranged at the blade tops as claimed in claim 1, wherein: the size ratio of the distance s between adjacent clearance channels (1) on the same blade (2) to the maximum thickness delta of the blade (2) is 2.0-3.5.
7. A centrifugal pump semi-open impeller with clearance passages arranged at the blade tops as claimed in claim 1, wherein: the size ratio of the distance s between adjacent clearance channels (1) on the same blade (2) to the maximum width d of the clearance channels (1) is 2.0-3.0.
8. A centrifugal pump semi-open impeller with clearance passages arranged at the blade tops as claimed in claim 1, wherein: the number of the clearance channels (1) is n, and n is [0.5 (D)2-D1)/s]-1 rounding, D1、D2The inlet diameter and the outlet diameter of the impeller, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020892292.5U CN212376954U (en) | 2020-05-25 | 2020-05-25 | Centrifugal pump semi-open impeller with gap channel arranged on blade top |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020892292.5U CN212376954U (en) | 2020-05-25 | 2020-05-25 | Centrifugal pump semi-open impeller with gap channel arranged on blade top |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212376954U true CN212376954U (en) | 2021-01-19 |
Family
ID=74178347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020892292.5U Active CN212376954U (en) | 2020-05-25 | 2020-05-25 | Centrifugal pump semi-open impeller with gap channel arranged on blade top |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212376954U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111536073A (en) * | 2020-05-25 | 2020-08-14 | 浙江理工大学 | Centrifugal pump semi-open impeller with gap channel arranged on blade top |
| CN113236601A (en) * | 2021-04-09 | 2021-08-10 | 西安理工大学 | Semi-open type centrifugal pump impeller structure |
| CN114607613A (en) * | 2022-02-11 | 2022-06-10 | 江苏大学 | Multistage semi-open type centrifugal pump capable of reducing abrasion |
-
2020
- 2020-05-25 CN CN202020892292.5U patent/CN212376954U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111536073A (en) * | 2020-05-25 | 2020-08-14 | 浙江理工大学 | Centrifugal pump semi-open impeller with gap channel arranged on blade top |
| CN113236601A (en) * | 2021-04-09 | 2021-08-10 | 西安理工大学 | Semi-open type centrifugal pump impeller structure |
| CN114607613A (en) * | 2022-02-11 | 2022-06-10 | 江苏大学 | Multistage semi-open type centrifugal pump capable of reducing abrasion |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN212376954U (en) | Centrifugal pump semi-open impeller with gap channel arranged on blade top | |
| US7037066B2 (en) | Turbine fuel pump impeller | |
| CN1083947C (en) | Impeller for centrifugal fan | |
| CN111536073A (en) | Centrifugal pump semi-open impeller with gap channel arranged on blade top | |
| JP3949663B2 (en) | Centrifugal impeller | |
| CN113236607B (en) | Design method of large-scale engineering pump volute and volute thereof | |
| CN105041720B (en) | A kind of efficiently quasi- annular pumping chamber Hydraulic Design Method of big overcurrent Turo pump | |
| CN115013318A (en) | Double-suction impeller structure for multistage centrifugal pump and design method thereof | |
| CN109441841B (en) | Space twisted plastic impeller type submersible pump for well | |
| CN110159586A (en) | A kind of double-layer staggered blade impellers | |
| CN213450988U (en) | Centrifugal impeller and ventilator thereof | |
| CN109340179A (en) | A kind of high-intensitive centrifugal impeller and motor suitable for dust catcher | |
| CN112648230A (en) | High-efficient anti cavitation centrifugal pump impeller | |
| JP5230568B2 (en) | Runner and fluid machinery | |
| CN207349169U (en) | A kind of compact liquefied natural gas immersed pump guide vane structure | |
| CN109931290B (en) | Backward centrifugal impeller | |
| CN210769506U (en) | Open impeller structure for high-speed pump | |
| CN209761810U (en) | Improved wind wheel structure | |
| CN208153063U (en) | The wheeling disk structure of disc type turbine | |
| CN1952407A (en) | Centrifugal pump having extrusion chamber with subchannel | |
| CN216867079U (en) | Centrifugal pump and guide vane wheel thereof | |
| CN219953735U (en) | Ternary flow impeller of centrifugal compressor | |
| CN102667176A (en) | Centrifugal pump | |
| CN218030770U (en) | Centrifugal pump impeller for weakening wake | |
| CN108331616A (en) | A kind of wheeling disk structure of disc type turbine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |