CN112762006B - Centrifugal pump impeller with adjustable balance hole state - Google Patents
Centrifugal pump impeller with adjustable balance hole state Download PDFInfo
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- CN112762006B CN112762006B CN202110073765.8A CN202110073765A CN112762006B CN 112762006 B CN112762006 B CN 112762006B CN 202110073765 A CN202110073765 A CN 202110073765A CN 112762006 B CN112762006 B CN 112762006B
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- 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
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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
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0027—Varying behaviour or the very pump
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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
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing 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 centrifugal pump impeller with adjustable balance hole state. The invention comprises a blade assembly, a back plate, a hub and a balance hole adjusting assembly; the blade subassembly is fixed to be welded on a terminal surface of backplate, installs balance hole adjusting part on another terminal surface of backplate, and the shaft hole has been seted up at the backplate center, and wheel hub fixed mounting sets up a plurality of interval arrangement's backplate balancing hole on the backplate of shaft hole circumferencial direction in the shaft hole, and balance hole adjusting part controls the state in a plurality of backplate balancing holes, realizes that the balance hole state is adjustable. The invention can effectively improve the performance of the pump; whether the balance hole is opened or not can be selected according to different working conditions, so that the centrifugal pump finds the optimal working condition point, and the pump keeps high efficiency in a larger working condition range; the balance hole is only adjusted within a certain range, collision cannot occur, the operation is simple, the realization is easy, and the adjustment of the balance hole can be realized under the condition of ensuring no collision.
Description
Technical Field
The invention relates to a centrifugal pump impeller in the technical field of centrifugal pumps, in particular to a centrifugal pump impeller with an adjustable balance hole state.
Background
The centrifugal pump impeller transfers the energy of a prime mover to liquid in a pump, so that the liquid in the pump increases speed and pressure, the liquid in the pump is driven to be discharged, and the liquid in an inlet pipeline is sucked in, which is one of the most important parts in the centrifugal pump. With the rapid development of national economy, centrifugal pumps are used in various fields. In the article, numerical simulation analysis is performed on a Q5H26 type high-speed centrifugal pump based on Computational Fluid Dynamics (CFD), and the change rule of the impeller perforated pump on the efficiency and the lift at different inlets under the gas-liquid two-phase condition is researched. The result shows that when the air content of the inlet is below 10 percent, the lift and the efficiency of the pump after the hole is opened are lower than those of the initial pump; when the air content of the inlet reaches 10%, the front and back lifts and the efficiency of the opening are basically kept equal; the inlet gas fraction exceeds 10%, and the external performance of the pump after opening the hole exceeds that of the initial pump.
Therefore, in order to operate the centrifugal pump in an optimal state, whether the impeller is provided with the hole or not needs to be selected according to different gas contents.
Disclosure of Invention
To address the problems and needs in the background art, the present invention provides a centrifugal pump impeller with adjustable balance hole conditions.
The invention comprises a blade assembly, a back plate, a hub and a balance hole adjusting assembly; the blade subassembly is fixed to be welded on a terminal surface of backplate, installs balance hole adjusting part on another terminal surface of backplate, and the shaft hole has been seted up at the backplate center, and wheel hub fixed mounting sets up a plurality of interval arrangement's backplate balancing hole on the backplate of shaft hole circumferencial direction in the shaft hole, and balance hole adjusting part controls the state in a plurality of backplate balancing holes, realizes that the balance hole state is adjustable.
The balance hole adjusting assembly comprises an upper limiting block, a side limiting block, a lower limiting block, a movable disc, a spring mounting column, a compression spring, a limiting column and a limiting pipe; the center of the movable disc is provided with a disc through hole, a plurality of disc balance holes which are arranged at intervals are arranged on the movable disc along the circumferential direction of the disc through hole, and the movable disc and the rear plate are coaxially arranged, so that the hub penetrates through the disc through hole and each rear plate balance hole is correspondingly superposed with each disc balance hole;
a raised circular edge is arranged on the end face of the rear plate for mounting the balance hole adjusting assembly, one end of a limiting pipe is fixedly connected to the top of the raised circular edge, the lower end of the limiting column is movably connected with the circumferential side face of the upper end of the movable disc, the upper end of the limiting column is movably inserted into the limiting pipe, an upper limiting block is fixedly mounted on the end face of the rear plate between the limiting pipe and the movable disc, and the upper limiting block and the limiting column are movably matched to form a limiting switch;
the circumference side of the lower end of the movable disc is fixedly connected with the upper end of the spring mounting column, a lower limiting block is fixedly mounted on the end face of the rear plate below the movable disc, a lower limiting through hole is formed in the lower limiting block, the lower end of the spring mounting column penetrates through the lower limiting through hole and is movably connected with the lower limiting block, and a compression spring is coaxially sleeved outside the spring mounting column between the movable disc and the lower limiting block;
the two sides of the end face of the movable disc are respectively provided with a strip-shaped groove, each strip-shaped groove is provided with a side limiting block used for sliding guide of the movable disc, the lower end of each side limiting block is directly and fixedly installed on the rear plate, each side limiting block is provided with a side limiting groove on the end face connected with the corresponding strip-shaped groove, and the upper end of each side limiting block is matched with the strip-shaped groove through the corresponding side limiting groove, so that the movable disc can slide up and down along the side limiting grooves on the two sides.
The upper limit block is matched with the limit column to form a limit switch, and the limit switch specifically comprises the following components:
the upper limiting block is provided with an upper limiting through hole and is coaxially and movably provided with a limiting post, the lower end face of the upper limiting block is a step-shaped end face, two steps of the step-shaped end face are divided into a first end face and a second end face, the first end face and the second end face are arranged on two sides of the upper limiting through hole, the first end face and the second end face are both provided with arc-shaped grooves in the same direction, two protruding posts are arranged on the circumference side of the middle part of the limiting post, the central axes of the two protruding posts are located on the same plane, the included angle of the two protruding posts is 90 degrees, one protruding post is arranged in one arc-shaped groove, and the other protruding post and the other arc-shaped groove are vacant.
The blade assembly comprises a plurality of arc-shaped blades which are uniformly welded on the end surface of the rear plate at equal intervals along the circumference.
The depth of the side limiting groove of the side limiting block is 0.2mm to 0.5mm greater than the thickness of the concave surface of the movable disc.
The invention has the beneficial effects that:
1. the centrifugal pump impeller with the adjustable balance hole state can effectively improve the performance of a pump because the balance hole has stronger balance axial force performance.
2. The centrifugal pump impeller with the adjustable balance hole state can select whether to open the balance hole according to different working conditions, so that the centrifugal pump finds the optimal working condition point, and the pump keeps high efficiency in a larger working condition range.
3. According to the centrifugal pump impeller with the adjustable balance hole state, the balance hole is only adjusted within a certain range, collision cannot occur, the operation is simple, the realization is easy, and the adjustment of the balance hole can be realized under the condition of ensuring no collision.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic view of a blade assembly according to the present invention;
FIG. 2 is a schematic view of the balance hole adjustment assembly of the present invention;
FIG. 3 is a schematic perspective view of the upper limit block and the limit post of the present invention;
FIG. 4 is a cross-sectional view of the balance hole of FIG. 1 open;
FIG. 5 is a cross-sectional view of the equalizing port of FIG. 1 closed;
FIG. 6 is a schematic structural view of a back plate of the impeller of the centrifugal pump of FIG. 1 with the balance holes being adjustable;
FIG. 7 is a cross-sectional view of the limiting post position of FIG. 3 with the balancing hole open;
FIG. 8 is a cross-sectional view of the position of the restraining post of FIG. 4 when the balancing hole is closed;
FIG. 9 is a comparison of the external performance of an impeller hole pump versus an impeller unbalanced hole pump;
in the figure: 1-blade assembly, 101-blade, 102-upper limit block, 103-side limit block, 104-lower limit block, 2-moving disk, 201-spring mounting column, 3-compression spring, 4-limit column, 5-back plate, 501-limit pipe and 502-hub.
Detailed Description
The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto.
As shown in fig. 1, 5 and 6, the present invention includes a blade assembly 1, a backplate 5, a hub 502 and a balance hole adjusting assembly; blade subassembly 1 is fixed to be welded on a terminal surface of backplate 5, installs balance hole adjusting part on another terminal surface of backplate 5, and the shaft hole has been seted up at backplate 5 center, and wheel hub 502 fixed mounting sets up a plurality of interval arrangement's backplate balance hole on the backplate 5 of shaft hole circumferencial direction in the shaft hole, and balance hole adjusting part controls the state in a plurality of backplate balance holes, realizes that the balance hole state is adjustable.
The blade assembly 1 includes a plurality of arc-shaped blades 101, and the plurality of arc-shaped blades 101 are welded to the end surface of the rear plate 5 at equal intervals along the circumference.
As shown in fig. 2 and 4, the balance hole adjusting assembly comprises an upper limit block 102, a side limit block 103, a lower limit block 104, a movable disc 2, a spring mounting column 201, a compression spring 3, a limit column 4 and a limit pipe 501; a disc through hole is formed in the center of the movable disc 2, a plurality of disc balance holes which are arranged at intervals are formed in the movable disc 2 along the circumferential direction of the disc through hole, the movable disc 2 and the rear plate 5 are coaxially installed, so that the hub 502 penetrates through the disc through hole, and each rear plate balance hole is correspondingly superposed with each disc balance hole;
a raised circular periphery is arranged on the end face of the rear plate 5 provided with the balance hole adjusting assembly, one end of a limiting pipe 501 is fixedly connected to the top of the raised circular periphery, the lower end of a limiting column 4 is movably connected with the circumferential side face of the upper end of the movable disc 2, a positioning hole is formed in the circumferential side of the upper end of the movable disc 2, the diameter of the limiting column 4 and the diameter of the positioning hole are smaller than 0.5mm, and the lower end of the limiting column 4 extends into the positioning hole to be movably connected with the movable disc 2; the upper end of the limit column 4 is movably inserted into the limit pipe 501, the upper limit block 102 is fixedly arranged on the end surface of the rear plate 5 between the limit pipe 501 and the movable disc 2, and the upper limit block 102 is movably matched with the limit column 4 to form a limit switch;
as shown in fig. 3, the upper limit block 102 and the limit post 4 cooperate to form a limit switch, which specifically comprises:
an upper limiting through hole is formed in the upper limiting block 102, the limiting column 4 is coaxially and movably mounted, the lower end face of the upper limiting block 102 is a step-shaped end face, the step-shaped end face comprises a first end face and a second end face, the first end face and the second end face are arranged on two sides of the upper limiting through hole, circular arc grooves in the same direction are formed in the first end face and the second end face, two protruding columns are arranged on the circumference of the middle of the limiting column 4, the central axes of the protruding columns are located on the same plane, the included angle of the protruding columns is 90 degrees, one protruding column is mounted in one circular arc groove, and the other protruding column and the other circular arc groove are vacant.
The circumference side of the lower end of the movable disc 2 is fixedly connected with the upper end of the spring mounting column 201, the lower limiting block 104 is fixedly mounted on the end face of the rear plate 5 below the movable disc 2, a lower limiting through hole is formed in the lower limiting block 104, the lower end of the spring mounting column 201 penetrates through the lower limiting through hole and is movably connected with the lower limiting block 104, a compression spring 3 is coaxially sleeved outside the spring mounting column 201 between the movable disc 2 and the lower limiting block 104, and the diameter of the lower limiting block 104 is 0.5mm larger than that of the spring mounting column 201 so as to ensure that the spring mounting column 201 is tightly attached to and smoothly slides on the lower limiting block 104. The circle center of the movable disc 2 is always on the connecting line of the limiting pipe 501, the limiting column 4 and the spring mounting column 201;
two sides of the end face of the movable disc 2 are respectively provided with a strip-shaped groove, each strip-shaped groove is provided with a side limiting block 103 for guiding the movable disc 2 in a sliding manner, the lower end of each side limiting block 103 is directly and fixedly arranged on the rear plate 5, the end face of each side limiting block 103 connected with each strip-shaped groove is provided with a side limiting groove, so that a step is formed on the end face of each side limiting block 103 connected with each strip-shaped groove, the upper end of each side limiting block 103 is matched with each strip-shaped groove through each side limiting groove, the movable disc 2 slides up and down along the side limiting grooves on the two sides, and the two side limiting blocks 103 guide and limit the two sides of the movable disc 2;
as shown in fig. 5, 7 and 8, the limit switch is adjusted, the movable disc 2 moves up and down, and then the relative positions of the balance hole of the back plate 5 and the balance hole of the disc are changed, so that the balance hole of the centrifugal pump impeller is opened and closed.
The depth of the side limiting groove of the side limiting block 103 is 0.2mm to 0.5mm larger than the thickness of the concave surface of the moving disc 2, so as to ensure that the strip-shaped groove of the moving disc 2 slides smoothly in the side limiting groove of the respective side limiting block 103.
The upper limit block 102, the two side limit blocks 103, and the lower limit block 104 are welded to the end surface of the rear plate 5, and the rear plate 5 is machined after welding, thereby ensuring accuracy. The limit pipe 501 and the hub 502 are welded to the rear plate 5, and the rear plate 5 is machined after welding, so that the accuracy is ensured. The diameter of the limiting pipe 501 is 0.5mm larger than that of the limiting column 4, and the limiting pipe 501 is sleeved into the limiting column 4 and welded with the blade assembly 1. The centrifugal pump impeller is assembled according to a symmetrical arrangement principle, and the mass center of the centrifugal pump impeller is obtained through SW software, so that the mass center of the centrifugal pump impeller is located in the center of the centrifugal pump impeller as much as possible under two states of opening and closing the balance hole. The displacement of the moving disc 2 is 10mm and the displacement of the center of mass is 10mm, i.e. the diameter of the balancing hole is 10 mm.
The working principle is as follows:
when the centrifugal pump impeller needs not to be provided with the hole, the flat screwdriver can be used for abutting against the convex column of the limiting column 4 in the circular arc groove of the first end surface of the upper limiting block 102, the limiting column 4 is lifted up after being pressed down and rotates clockwise by 90 degrees, and then the other convex column of the limiting column 4 can be installed in the circular arc groove of the second end surface.
Conversely, when the impeller needs to be holed, a flat screwdriver can be used for abutting against the protruding column of the limiting column 4 in the circular arc groove on the second end face of the upper limiting block 102, the limiting column 4 is lifted up and rotated 90 degrees anticlockwise after being pressed down, and then the other protruding column of the limiting column 4 can be installed in the circular arc groove on the first end face.
Fig. 9, table 1 and table 2 show that as the air intake void fraction increases, both the original pump and the impeller hole pump efficiency gradually decrease. When the gas content is less than 10%, the efficiency of the original pump is higher than that of the impeller perforated pump under the same gas content condition; when the air content is equal to 10%, the efficiency of the original pump is equivalent to that of the impeller tapping pump; when the air void is greater than 10%, the efficiency of the impeller trepan pump is much greater than that of the original pump. The invention aims to solve the problem that the efficiency of the centrifugal pump is in an optimal state by opening or closing the hole under different gas-containing rate working conditions.
TABLE 1 external characteristics of the original pump at different inlet gas void fractions
TABLE 2 external characteristics of impeller hole pumps at different inlet gas ratios
The invention has the advantages of simple structure, convenient installation, safety, reliability and the like.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (4)
1. The utility model provides a balanced hole state adjustable centrifugal pump impeller which characterized in that: the device comprises a blade assembly (1), a rear plate (5), a hub (502) and a balance hole adjusting assembly; the blade assembly (1) is fixedly welded on one end face of the rear plate (5), the balance hole adjusting assembly is mounted on the other end face of the rear plate (5), a shaft hole is formed in the center of the rear plate (5), the hub (502) is fixedly mounted in the shaft hole, a plurality of rear plate balance holes which are arranged at intervals are formed in the rear plate (5) in the circumferential direction of the shaft hole, and the balance hole adjusting assembly controls the states of the plurality of rear plate balance holes to realize that the states of the balance holes are adjustable;
the balance hole adjusting assembly comprises an upper limiting block (102), a side limiting block (103), a lower limiting block (104), a movable disc (2), a spring mounting column (201), a compression spring (3), a limiting column (4) and a limiting pipe (501); a disc through hole is formed in the center of the movable disc (2), a plurality of disc balance holes which are arranged at intervals are formed in the movable disc (2) along the circumferential direction of the disc through hole, the movable disc (2) and the rear plate (5) are coaxially arranged, so that the hub (502) penetrates through the disc through hole, and the rear plate balance holes are correspondingly overlapped with the disc balance holes;
a raised circular edge is arranged on the end face of a rear plate (5) provided with the balance hole adjusting assembly, one end of a limiting pipe (501) is fixedly connected to the top of the raised circular edge, the lower end of a limiting column (4) is movably connected with the circumferential side face of the upper end of the movable disc (2), the upper end of the limiting column (4) is movably inserted into the limiting pipe (501), an upper limiting block (102) is fixedly arranged on the end face of the rear plate (5) between the limiting pipe (501) and the movable disc (2), and the upper limiting block (102) is movably matched with the limiting column (4) to form a limiting switch;
the circumference side of the lower end of the movable disc (2) is fixedly connected with the upper end of a spring mounting column (201), a lower limiting block (104) is fixedly mounted on the end surface of the rear plate (5) below the movable disc (2), a lower limiting through hole is formed in the lower limiting block (104), the lower end of the spring mounting column (201) penetrates through the lower limiting through hole and is movably connected with the lower limiting block (104), and a compression spring (3) is coaxially sleeved outside the spring mounting column (201) between the movable disc (2) and the lower limiting block (104);
remove the both sides of disc (2) terminal surface and respectively open and to have a bar recess, every bar recess department all is equipped with one and is used for side spacing piece (103) to removing disc (2) sliding guide, the direct fixed mounting of lower extreme of every side spacing piece (103) is on back plate (5), all open on the terminal surface that every side spacing piece (103) and respective bar recess link to each other and have a side spacing recess, every side spacing piece (103) upper end all is through side spacing recess and bar recess cooperation certainly, make removal disc (2) slide from top to bottom along the side spacing recess of both sides.
2. The centrifugal pump impeller with adjustable balance hole state according to claim 1, wherein: the upper limiting block (102) is matched with the limiting column (4) to form a limiting switch, and the limiting switch specifically comprises the following components:
an upper limiting through hole is formed in the upper limiting block (102), a limiting column (4) is coaxially and movably mounted, the lower end face of the upper limiting block (102) is a step-shaped end face, two steps of the step-shaped end face are divided into a first end face and a second end face, the first end face and the second end face are arranged on two sides of the upper limiting through hole, arc-shaped grooves in the same direction are formed in the first end face and the second end face, two protruding columns are arranged on the circumference side of the middle portion of the limiting column (4), the central axes of the protruding columns are located on the same plane, the included angle is 90 degrees, one protruding column is mounted in one arc-shaped groove, and the other protruding column and the other arc-shaped groove are vacant.
3. The impeller for centrifugal pumps with adjustable balance hole states of claim 1, wherein: the blade assembly (1) comprises a plurality of arc-shaped blades (101), and the arc-shaped blades (101) are welded on the end face of the rear plate (5) at equal intervals along the circumference.
4. The impeller for centrifugal pumps with adjustable balance hole states of claim 1, wherein: the depth of the side limiting groove of the side limiting block (103) is 0.2mm to 0.5mm greater than the thickness of the concave surface of the movable disc (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110073765.8A CN112762006B (en) | 2021-01-20 | 2021-01-20 | Centrifugal pump impeller with adjustable balance hole state |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110073765.8A CN112762006B (en) | 2021-01-20 | 2021-01-20 | Centrifugal pump impeller with adjustable balance hole state |
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| CN112762006A CN112762006A (en) | 2021-05-07 |
| CN112762006B true CN112762006B (en) | 2022-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110073765.8A Active CN112762006B (en) | 2021-01-20 | 2021-01-20 | Centrifugal pump impeller with adjustable balance hole state |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114483640B (en) * | 2022-01-25 | 2022-10-28 | 威乐(中国)水泵***有限公司 | Impeller for centrifugal pump and compact industrial refrigeration pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6193462B1 (en) * | 1998-04-08 | 2001-02-27 | Nikkiso Co., Ltd. | Thrust balance device |
| JP2012047131A (en) * | 2010-08-27 | 2012-03-08 | Toyota Motor Corp | Electric water pump of internal combustion engine |
| CN203297136U (en) * | 2013-06-04 | 2013-11-20 | 江苏大学 | Axial force balancing device of centrifugal residual heat removal pump for nuclear power |
| CN207122435U (en) * | 2017-06-27 | 2018-03-20 | 江苏巨浪泵阀有限公司 | A kind of centrifugal pump with equilibrium centrifugation pump axial force mechanism |
| CN111456964A (en) * | 2020-05-19 | 2020-07-28 | 山东心传矿山机电设备有限公司 | Automatic impeller balance hole device of adjusting |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9689402B2 (en) * | 2014-03-20 | 2017-06-27 | Flowserve Management Company | Centrifugal pump impellor with novel balancing holes that improve pump efficiency |
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2021
- 2021-01-20 CN CN202110073765.8A patent/CN112762006B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6193462B1 (en) * | 1998-04-08 | 2001-02-27 | Nikkiso Co., Ltd. | Thrust balance device |
| JP2012047131A (en) * | 2010-08-27 | 2012-03-08 | Toyota Motor Corp | Electric water pump of internal combustion engine |
| CN203297136U (en) * | 2013-06-04 | 2013-11-20 | 江苏大学 | Axial force balancing device of centrifugal residual heat removal pump for nuclear power |
| CN207122435U (en) * | 2017-06-27 | 2018-03-20 | 江苏巨浪泵阀有限公司 | A kind of centrifugal pump with equilibrium centrifugation pump axial force mechanism |
| CN111456964A (en) * | 2020-05-19 | 2020-07-28 | 山东心传矿山机电设备有限公司 | Automatic impeller balance hole device of adjusting |
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