CN113883085B - Segment type centrifugal pump back vane - Google Patents
Segment type centrifugal pump back vane Download PDFInfo
- Publication number
- CN113883085B CN113883085B CN202111169546.6A CN202111169546A CN113883085B CN 113883085 B CN113883085 B CN 113883085B CN 202111169546 A CN202111169546 A CN 202111169546A CN 113883085 B CN113883085 B CN 113883085B
- Authority
- CN
- China
- Prior art keywords
- segment
- type back
- vane
- impeller
- cover plate
- 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.)
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Links
- 238000007789 sealing Methods 0.000 abstract description 12
- 239000007788 liquid Substances 0.000 abstract description 8
- 230000002457 bidirectional effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- F04D29/2205—Conventional flow pattern
- F04D29/2222—Construction and assembly
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a segment type centrifugal pump back vane which comprises an impeller back cover plate and a back vane segment; the center of the impeller rear cover plate is provided with a cylindrical step, the center of the cylindrical step is a through hole, the impeller rear cover plate is provided with a plurality of positioning ribs which start from the cylindrical step and extend along the radial direction, and a plurality of positioning holes are distributed on the positioning ribs; and each positioning rib is provided with a plurality of back blade sections, and the back blade sections are fixed on the positioning holes on the positioning ribs by bolts. By using different numbers of segments, constituting a back vane of adjustable length, different degrees of sealing capability are provided, thereby achieving a bi-directional seal against liquid leakage and air ingress.
Description
Technical Field
The invention relates to the technical field of fluid machinery, in particular to a back vane of a segmental centrifugal pump.
Background
The pump is a prime mover for increasing potential energy, pressure energy and kinetic energy of liquid, and is classified into a centrifugal pump, a mixed flow pump and an axial flow pump according to the magnitude of a specific rotation speed. The centrifugal pump has low specific rotation speed and high lift, and in order to balance the pressure difference between the fluid in the pump and the atmosphere outside the pump and prevent the liquid from leaking outwards, a sealing device called a shaft seal is required to be arranged. The back vane seal is one kind of shaft seal, and back vane is installed on the back cover board of the impeller to produce pressure during rotation and to prevent liquid from leaking from the gap of the rotating shaft.
However, the conventional back blades are fixed to the back cover plate of the impeller, the length of the back blades is not adjustable, and the back blades synchronously rotate when the impeller rotates, so that the pressure generated by the back blades is constant. The sealing effect of conventional back vanes will be very limited when the pressure at the inlet of the centrifugal pump varies, for example: when the inlet pressure of the centrifugal pump is increased, the pressure generated by the back vane is lower than the sealing pressure value, and the liquid is leaked outwards from the gap of the rotating shaft; when the inlet pressure of the centrifugal pump is reduced, the pressure generated by the back vane is higher than the sealing pressure value, and air enters the pump cavity inwards from the gap of the rotating shaft. Both liquid leakage and air ingress can lead to unstable operation of the centrifugal pump, and in severe cases, to accidents.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a segment type centrifugal pump back vane which is composed of a plurality of segments, each segment can be connected with or detached from the back vane, and the back vane with adjustable length is composed by using different numbers of segments, so that sealing pressure capability with different degrees is provided, and bidirectional sealing for preventing liquid leakage and air entering is realized.
A segmented centrifugal pump back vane, which is characterized by comprising an impeller back cover plate and a back vane segment; the center of the impeller rear cover plate is provided with a cylindrical step, the center of the cylindrical step is a through hole, the impeller rear cover plate is provided with a plurality of positioning ribs which start from the cylindrical step and extend along the radial direction, and a plurality of positioning holes are distributed on the positioning ribs; and each positioning rib is provided with a plurality of back blade sections, and the back blade sections are fixed on the positioning holes on the positioning ribs by bolts.
Further, the plurality of positioning ribs are uniformly distributed on the impeller back cover plate along the circumferential direction and extend to the rim of the impeller back cover plate.
Further, the back blade segment is divided into an A-type back blade segment and a B-type back blade segment, one end surface of the A-type back blade segment is a concave arc curved surface and is used for being connected with the side surface of the cylindrical step, and the other end surface of the A-type back blade segment is a plane and is used for being connected with the B-type back blade segment; the two end surfaces of the B-type back blade segment are plane surfaces and are used for connecting the A-type back blade segment and the B-type back blade segment or connecting the two B-type back blade segments.
Further, each positioning rib is provided with an A-type back blade section and a plurality of B-type back blade sections, the A-type back blade sections are positioned close to the cylindrical steps, and one surface of each A-type back blade section, which is close to the cylindrical steps, is a concave arc curved surface.
Further, the A-type back blade segment and the B-type back blade segment are identical in length and 0.02D-0.05D in length, wherein D is the diameter of the impeller at the rim of the back cover plate.
Further, the lower end surfaces of the A-type back blade segment and the B-type back blade segment are provided with channels, the width and the height of the channels are matched with the positioning ribs, the upper end surface is provided with through holes, bolts are connected with the positioning holes after passing through the through holes, and the relative positions of the segments and the impeller back cover plate are fixed.
Further, the distance between the locating holes corresponds to the length of the back blade segment.
Further, the cylindrical step side radius is consistent with the A-type back blade segment curved surface radius, and the cylindrical step height, the A-type back blade segment and the B-type back blade segment height are consistent.
Further, the number of the positioning ribs is 5-7.
The back vane of the segmental centrifugal pump is formed by combining a plurality of segments, and the length of the back vane is adjustable by using different numbers of back vane segments, so that the aim of manually adjusting the length is fulfilled. In the actual use process, the required sealing pressure value can be calculated according to the pressure difference between the inner cavity of the centrifugal pump and the atmosphere, the sealing pressure capacity of the back blades needs to be adjusted, and the back blades are assembled by selecting proper number of sections, so that the bidirectional sealing for preventing liquid leakage and air entering is realized.
Drawings
FIG. 1 is a schematic view of a segmented centrifugal pump back vane according to the present invention;
FIG. 2 is a schematic view of the impeller back shroud;
FIG. 3 is a cross-sectional view of the impeller back shroud A-A;
FIG. 4 is a cross-sectional view of the positioning rib B-B;
FIG. 5 is a schematic view of the A-type back blade segment;
FIG. 6 is a schematic view of the B-type back blade segment;
FIG. 7 is a cross-sectional view of the back blade segment C-C.
The impeller comprises a rear cover plate of a 1-impeller, a through hole of a 2-cylindrical step, a 3-positioning rib, a 4-positioning hole, a 5-A type back blade section, a 6-cylindrical step, a 7-B type back blade section, an 8-bolt and a rim of the rear cover plate of the 9-impeller.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The impeller back cover plate 1 is part of the impeller and rotates with the impeller, typically at 980 rpm, 1450 rpm and 2900 rpm. As shown in fig. 1, the segmented centrifugal pump back vane of the invention mainly comprises an impeller back cover plate 1, an a-type back vane segment 5 and a B-type back vane segment 7. Referring to fig. 2 and 3, a cylindrical step 6 is arranged at the center of the impeller rear cover plate 1, the outer diameter of the cylindrical step 6 is R, the value range is 0.15D-0.2D, the height is 0.05D, and D is the diameter of the rim 9 of the impeller rear cover plate. The center of the cylindrical step 6 is provided with a through hole 2, so that the impeller can conveniently penetrate through the rotating shaft and fix the relative position of the impeller and the rotating shaft. The rotating shaft penetrates through the through hole 2 and is fixed with the impeller rear cover plate 1 to drive the impeller to rotate. The radius of the through hole 2 is R, which satisfies r=1.3r-1.4r.
Referring to fig. 2 and 4, the impeller back cover plate 1 is provided with a plurality of positioning ribs 3, the height of which is 0.025D, the width of which is 0.025D, the positioning ribs 3 are distributed along the radial direction, and extend from the side surface of the cylindrical step 6 to the rim 9 of the impeller back cover plate. The positioning ribs 3 are provided with positioning holes 4, and the distance between the positioning holes 4 is consistent with the length of the back blade segment.
As shown in fig. 5, the two end surfaces of the a-type back blade segment 5 are curved surfaces of which the one is a plane and the other is a concave arc, and the radius of the curved surface is R, which is equal to the radius of the side surface of the cylindrical step 6. When the a-type back blade segment 5 is connected to the side of the cylindrical step 6, a seamless connection is achieved.
As shown in fig. 6, both end surfaces of the B-type back blade segment are planar for connecting the a-type back blade segment 5 and the B-type back blade segment 7, or for connecting two B-type back blade segments 7. The A-type back blade segment 5 and the B-type back blade segment 7 are 0.05D in width and 0.02-0.05D in length, and the segment length takes a small value when the sealing and pressing required adjustment precision is high, and takes a large value when the sealing and pressing required adjustment precision is low.
Fig. 7 is a schematic C-C section view of a type a back blade segment 5, a type B back blade segment 7, with a height of 0.05D, consistent with the cylindrical step 6, which enables a smooth connection when the type a back blade segment 5 is connected to the side of the cylindrical step 6. The lower end face of the back blade segment is provided with a channel, the width of the channel is 0.025D, the height of the channel is 0.025D, the channel is consistent with the positioning ribs 3, and when the back blade segment is placed on the positioning ribs 3, the back blade segment can slide along the radial direction to adjust the relative position. The upper end face of the back blade section is provided with a through hole, a bolt 8 is connected with the positioning hole 4 after passing through the through hole, and the relative position of the back blade section and the impeller back cover plate 1 is fixed.
The single A-type back blade segment 5 and the plurality of B-type back blade segments 7 are assembled with the positioning holes 4 on the positioning ribs 3 through bolts 8 and fixed on the positioning ribs 3 on the impeller back cover plate 1 to form a segment type back blade, and the length of the back blade is adjustable by additionally installing or detaching the B-type back blade segments. A plurality of segmental back blades can be installed on the impeller back cover plate 1, the number of the segmental back blades is usually 5-7, namely, the number of the locating ribs 3 is 5-7, and the locating ribs are uniformly distributed along the circumferential direction. According to the centrifugal pump lift selection, when the centrifugal pump lift is higher and needs to seal higher pressure, the number of the sectional back blades can take a large value, and when the centrifugal pump lift is lower and needs to seal lower pressure, the number of the sectional back blades can take a small value.
The examples are preferred embodiments of the present invention, but the present invention is not limited to the above-described embodiments, and any obvious modifications, substitutions or variations that can be made by one skilled in the art without departing from the spirit of the present invention are within the scope of the present invention.
Claims (6)
1. A segment centrifugal pump back vane is characterized by comprising an impeller back cover plate (1) and a back vane segment; the center of the impeller rear cover plate (1) is provided with a cylindrical step, the center of the cylindrical step is provided with a through hole (2), the impeller rear cover plate (1) is provided with a plurality of positioning ribs (3) which start from the cylindrical step and extend along the radial direction, and a plurality of positioning holes (4) are distributed on the positioning ribs (3); a plurality of back blade sections are arranged on each positioning rib (3) and are fixed on positioning holes on the positioning ribs (3) by bolts (8);
the back blade segment is divided into an A-type back blade segment (5) and a B-type back blade segment (7), one end surface of the A-type back blade segment (5) is a concave arc curved surface and is used for being connected with the side surface of the cylindrical step (6), and the other end surface of the A-type back blade segment is a plane and is used for being connected with the B-type back blade segment (7); the two end surfaces of the B-type back blade segment (7) are plane and are used for connecting the A-type back blade segment (5) and the B-type back blade segment (7) or connecting the two B-type back blade segments (7);
the lengths of the A-type back blade segment (5) and the B-type back blade segment (7) are consistent, and the lengths are 0.02D-0.05D, wherein D is the diameter of the impeller back cover plate rim (9);
the lower end surfaces of the A-type back blade section (5) and the B-type back blade section (7) are provided with channels, the width and the height of the channels are matched with those of the positioning ribs (3), the upper end surface is provided with through holes, bolts (8) are connected with the positioning holes (4) after passing through the through holes, and the relative positions of the sections and the impeller back cover plate (1) are fixed.
2. A segmented centrifugal pump back vane according to claim 1, characterized in that the plurality of positioning ribs (3) are evenly distributed circumferentially on the impeller back cover plate (1) and extend all the way to the impeller back cover plate rim (9).
3. A segmented centrifugal pump back vane according to claim 1, characterized in that each positioning rib (3) is provided with an a-type back vane segment (5) and a plurality of B-type back vane segments (7), the a-type back vane segments (5) are positioned close to the cylindrical steps, and the side of the a-type back vane segments (5) close to the cylindrical steps is provided with a concave arc curved surface.
4. A segmented centrifugal pump back vane according to claim 1, characterized in that the distance between the positioning holes (4) corresponds to the back vane segment length.
5. A segmented centrifugal pump back vane according to claim 1, characterized in that the side radius of the cylindrical step (6) corresponds to the radius of the curved surface of the a-type back vane segment (5), the height of the cylindrical step (6), the a-type back vane segment (5) and the B-type back vane segment (7) corresponds.
6. A segmented centrifugal pump back vane according to claim 1, characterized in that the number of positioning ribs (3) is 5-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111169546.6A CN113883085B (en) | 2021-10-08 | 2021-10-08 | Segment type centrifugal pump back vane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111169546.6A CN113883085B (en) | 2021-10-08 | 2021-10-08 | Segment type centrifugal pump back vane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113883085A CN113883085A (en) | 2022-01-04 |
| CN113883085B true CN113883085B (en) | 2024-02-09 |
Family
ID=79005252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111169546.6A Active CN113883085B (en) | 2021-10-08 | 2021-10-08 | Segment type centrifugal pump back vane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113883085B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3958905A (en) * | 1975-01-27 | 1976-05-25 | Deere & Company | Centrifugal compressor with indexed inducer section and pads for damping vibrations therein |
| JPH05149103A (en) * | 1991-11-28 | 1993-06-15 | Kobe Steel Ltd | Divided type radial turbine impeller |
| KR930020035A (en) * | 1992-03-17 | 1993-10-19 | 박희권 | Centrifugal pump impeller |
| JP2004308647A (en) * | 2003-03-24 | 2004-11-04 | Hitachi Industries Co Ltd | Method for manufacturing impeller, and impeller |
| CN202152744U (en) * | 2011-07-12 | 2012-02-29 | 蔡锦飞 | Novel electric fan |
| CN202418031U (en) * | 2011-12-21 | 2012-09-05 | 秦永强 | Retractable electric fan head |
| CN202441649U (en) * | 2012-02-24 | 2012-09-19 | 张理政 | Improved ceiling fan |
| CN102691678A (en) * | 2012-06-11 | 2012-09-26 | 康跃科技股份有限公司 | Continuous supercharge compressor |
| CN103835988A (en) * | 2014-03-11 | 2014-06-04 | 门立山 | Centrifugal pump impeller |
| CN105298853A (en) * | 2015-10-15 | 2016-02-03 | 扬州市君睿创智工业设计有限公司 | Centrifugal pump |
| CN105422503A (en) * | 2015-12-30 | 2016-03-23 | 合肥华升泵阀股份有限公司 | Combined impeller |
| WO2020027489A1 (en) * | 2018-08-03 | 2020-02-06 | 한국수자원공사 | Variable impeller of pump |
-
2021
- 2021-10-08 CN CN202111169546.6A patent/CN113883085B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3958905A (en) * | 1975-01-27 | 1976-05-25 | Deere & Company | Centrifugal compressor with indexed inducer section and pads for damping vibrations therein |
| JPH05149103A (en) * | 1991-11-28 | 1993-06-15 | Kobe Steel Ltd | Divided type radial turbine impeller |
| KR930020035A (en) * | 1992-03-17 | 1993-10-19 | 박희권 | Centrifugal pump impeller |
| JP2004308647A (en) * | 2003-03-24 | 2004-11-04 | Hitachi Industries Co Ltd | Method for manufacturing impeller, and impeller |
| CN202152744U (en) * | 2011-07-12 | 2012-02-29 | 蔡锦飞 | Novel electric fan |
| CN202418031U (en) * | 2011-12-21 | 2012-09-05 | 秦永强 | Retractable electric fan head |
| CN202441649U (en) * | 2012-02-24 | 2012-09-19 | 张理政 | Improved ceiling fan |
| CN102691678A (en) * | 2012-06-11 | 2012-09-26 | 康跃科技股份有限公司 | Continuous supercharge compressor |
| CN103835988A (en) * | 2014-03-11 | 2014-06-04 | 门立山 | Centrifugal pump impeller |
| CN105298853A (en) * | 2015-10-15 | 2016-02-03 | 扬州市君睿创智工业设计有限公司 | Centrifugal pump |
| CN105422503A (en) * | 2015-12-30 | 2016-03-23 | 合肥华升泵阀股份有限公司 | Combined impeller |
| WO2020027489A1 (en) * | 2018-08-03 | 2020-02-06 | 한국수자원공사 | Variable impeller of pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113883085A (en) | 2022-01-04 |
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