CN112814913A - Single-inlet double-sided impeller centrifugal pump - Google Patents
Single-inlet double-sided impeller centrifugal pump Download PDFInfo
- Publication number
- CN112814913A CN112814913A CN202110019450.5A CN202110019450A CN112814913A CN 112814913 A CN112814913 A CN 112814913A CN 202110019450 A CN202110019450 A CN 202110019450A CN 112814913 A CN112814913 A CN 112814913A
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- China
- Prior art keywords
- double
- sided impeller
- impeller
- sided
- inlet
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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
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
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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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/041—Axial thrust balancing
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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
- F04D29/2205—Conventional flow pattern
- F04D29/2216—Shape, geometry
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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)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a single-inlet double-sided impeller centrifugal pump, which relates to the technical field of centrifugal pumps and comprises a shell, a transmission shaft, double-sided impellers, a thrust washer and a thrust bearing, wherein the transmission shaft is arranged in the shell, one end of the shell is provided with a suction inlet, one end of the transmission shaft points to the suction inlet, the outer edge of one end of the transmission shaft is provided with the double-sided impellers, the double-sided impellers are provided with a plurality of back impeller liquid inlets, the back impeller liquid inlets are in an annular array, the outer edge of the transmission shaft is also provided with the thrust washer and the thrust bearing, the thrust bearing is positioned on one side of the double-sided impellers, which is far away from the suction inlet, the thrust washer is arranged between the thrust. The invention thoroughly balances the axial force of the centrifugal pump by using a simple and reliable structure, thereby increasing the reliability and prolonging the service life of the centrifugal pump.
Description
Technical Field
The invention relates to the technical field of centrifugal pumps, in particular to a single-inlet double-sided impeller centrifugal pump.
Background
The axial force of the centrifugal pump is mainly generated by the pressure difference between the front and the rear of a rotor, the axial force balance is a problem which needs to be considered by a designer, and common balance methods comprise the following steps: firstly, arranging a thrust bearing; secondly, forming balance holes; thirdly, double-suction impellers are symmetrically arranged; and fourthly, arranging a balance drum (or balance disc).
In the case of the centrifugal pump with a low specific speed, the advantage is obvious if the axial force is balanced by the method, but the disadvantage is that the structure is relatively complex on the whole.
Disclosure of Invention
The invention aims to provide a single-inlet double-sided impeller centrifugal pump which is used for solving the technical problem.
The technical scheme adopted by the invention is as follows:
a single-inlet double-sided impeller centrifugal pump comprises a shell, a transmission shaft, a double-sided impeller, a thrust washer and a thrust bearing, wherein the transmission shaft is arranged in the shell, one end of the shell is provided with a suction inlet, one end of the transmission shaft points to the suction inlet, the outer edge of one end of the transmission shaft is provided with the double-sided impeller, a plurality of back impeller liquid inlets are arranged on the double-sided impeller, the liquid inlets of the back impellers are in an annular array, the outer edge of the transmission shaft is also provided with the thrust washer and the thrust bearing, wherein the thrust bearing is positioned at one side of the double-sided impeller far away from the suction inlet, and the thrust washer is arranged between the thrust bearing and the double-sided impeller, one side of the thrust washer abuts against the thrust bearing, and the other side of the thrust washer abuts against the double-sided impeller.
Preferably, the double-sided impeller comprises a wheel disc, a wheel shaft, front blades and back blades, wherein the wheel shaft is arranged in the middle of the wheel disc and can be sleeved on the outer edge of the transmission shaft, a plurality of front blades are arranged on one side of the wheel disc, a plurality of back blades are arranged on the other side of the wheel disc, and each back blade is respectively opposite to one front blade.
As a further preference, a plurality of said back impeller liquid inlets are located outside said axle.
Preferably, the double-sided impeller further comprises an inducer, the inducer is arranged on the outer edge of one end of the transmission shaft, and the inducer is located on one side, close to the suction port, of the double-sided impeller.
As a further optimization, the double-faced impeller and the inducer are respectively connected with the transmission shaft through a self-locking nut.
Further preferably, the double-sided impeller comprises a flat key, and the inducer is connected with the double-sided impeller through the flat key.
Preferably, the drive shaft is provided coaxially with the suction port.
Preferably, the outer edge of the other side of the thrust washer is provided with an oblique notch, and the liquid inlets of the back impellers are opposite to the oblique notch.
The technical scheme has the following advantages or beneficial effects:
(1) in the invention, when the inlet is not pressurized, the axial force of the centrifugal pump is balanced by the double-sided impeller, so that the reliability and the service life of the pump are improved;
(2) in the invention, when the inlet pressurization is very high, an axial force pointing to the double-sided impeller from the inlet can be generated, and the axial force is borne by the thrust bearing and the thrust washer, so that the reliability and the service life of the centrifugal pump are improved;
(3) in the invention, the double-sided impeller is adopted, so that the axial forces on two sides of the double-sided impeller can be exactly offset, the service life of the bearing can be prolonged, and the reliability and the service life of the whole pump are improved.
Drawings
FIG. 1 is a schematic structural view of a double-sided impeller of the present invention;
FIG. 2 is a schematic view of a thrust washer of the present invention;
fig. 3 is a schematic view of the internal structure of the single-inlet double-sided impeller centrifugal pump of the present invention.
In the figure: 1. a housing; 2. a drive shaft; 3. a double-sided impeller; 31. a wheel disc; 32. a wheel axle; 33. a front blade; 34. a back blade; 4. a thrust washer; 5. a thrust bearing; 6. a suction inlet; 7. a liquid inlet of a back impeller; 8. an inducer; 9. a bevel notch; 10. a baffle.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
FIG. 1 is a schematic structural view of a double-sided impeller of the present invention; FIG. 2 is a schematic view of a thrust washer of the present invention; fig. 3 is a schematic view of the internal structure of the single-inlet double-sided impeller centrifugal pump of the present invention. Referring to fig. 1 to 3, there is shown a preferred embodiment of a single inlet double-sided impeller centrifugal pump comprising a casing 1, a drive shaft 2, a double-sided impeller 3, a thrust washer 4 and a thrust bearing 5, wherein, a transmission shaft 2 is arranged in the shell 1, one end of the shell 1 is provided with a suction inlet 6, one end of the transmission shaft 2 points to the suction inlet 6, the outer edge of one end of the transmission shaft 2 is provided with a double-sided impeller 3, the double-sided impeller 3 is provided with a plurality of back impeller liquid inlets 7, a plurality of back impeller liquid inlets 7 are in an annular array, the outer edge of the transmission shaft 2 is also provided with a thrust washer 4 and a thrust bearing 5, the thrust bearing 5 is positioned on one side of the double-sided impeller 3 far away from the suction inlet 6, the thrust washer 4 is arranged between the thrust bearing 5 and the double-sided impeller 3, one side of the thrust washer 4 abuts against the thrust bearing 5, and the other side of the thrust washer 4 abuts against the double-sided impeller 3. In the present embodiment, as shown in fig. 3, the transmission shaft 2 is used for driving the double-sided impeller 3 to rotate; the casing 1 is a centrifugal pump casing 1, only one suction inlet 6 and a thrust washer 4 are arranged on the casing 1 and used for fluid to enter, as shown in fig. 3, one side of the double-sided impeller 3 close to the suction inlet 6 is a front side, one side of the double-sided impeller 3 far away from the suction inlet 6 is a back side, and the thrust washer and the thrust bearing 5 are both arranged on the back side of the double-sided impeller 3 and used for bearing axial force directed to the double-sided impeller 3 from an inlet, so that the reliability and the service life of the centrifugal pump. And the outer edge of the transmission shaft 2 is provided with a step-shaped flange structure which is used for abutting against the front surface of the double-sided impeller 3 and bearing the axial force of the double-sided impeller 3 pointing to the inlet direction. When fluid enters the shell 1 from the suction inlet 6, one part of the fluid flows into the front surface of the double-sided impeller 3, and the other part of the fluid enters the back surface of the double-sided impeller 3 from the back impeller liquid inlet 7, so that axial forces on the front surface and the back surface of the double-sided impeller 3 are mutually offset, the service life of a bearing is prolonged, and the reliability and the service life of the whole pump are improved. The fuel pump is applied to the fuel pump of an aircraft engine, and can achieve a very good effect.
Further, as a preferred embodiment, the double-sided impeller 3 includes a wheel disc 31, a wheel shaft 32, front blades 33 and back blades 34, wherein the wheel shaft 32 is disposed in the middle of the wheel disc 31, the wheel shaft 32 can be sleeved on the outer edge of the transmission shaft 2, one side of the wheel disc 31 is provided with a plurality of front blades 33, the other side of the wheel disc 31 is provided with a plurality of back blades 34, and each back blade 34 is respectively opposite to one front blade 33. In this embodiment, as shown in fig. 1, the front blades 33 and the back blades 34 are both arc-shaped, and the front blades 33 and the back blades 34 are all uniformly arranged around the periphery of the wheel shaft 32.
Further, as a preferred embodiment, a plurality of back impeller liquid inlets 7 are located outside the wheel shaft 32. In this embodiment, as shown in fig. 1, the liquid inlet 7 of the back impeller is located between the wheel shaft 32 and the front blades 33, and a guide plate 10 is obliquely arranged inside each liquid inlet 7 of the back impeller, so that the fluid on the front side of the double-side impeller 3 can rapidly enter the back side of the double-side impeller 3, and the effect of rapidly counteracting the axial forces on the two sides of the double-side impeller 3 is achieved.
Further, as a preferred embodiment, the double-sided impeller further comprises an inducer 8, the inducer 8 is arranged on the outer edge of one end of the transmission shaft 2, and the inducer 8 is located on one side of the double-sided impeller 3 close to the suction port 6.
Further, as a preferred embodiment, the double-sided impeller 3 and the inducer 8 are respectively connected with the transmission shaft 2 through a self-locking nut.
Further, as a preferred embodiment, the double-sided impeller further comprises a flat key, and the inducer 8 is connected with the double-sided impeller 3 through the flat key. In this embodiment, as shown in fig. 3, an inducer 8 is combined with the double-sided impeller 3, the inducer 8 pre-pressurizes the double-sided impeller 3 to prevent the double-sided impeller 3 from cavitation, the double-sided impeller 3 is a main working component of the pump, and the double-sided impeller 3 and the inducer 8 are fixed on the transmission shaft 2 by self-locking nuts and transmit torque by flat keys. In this embodiment, the inducer 8 itself has good cavitation resistance, the inducer 8 belongs to an axial-flow impeller, and has the cavitation characteristic of the axial-flow impeller, and the lift generated by the inducer 8 can pre-pressurize the double-sided impeller 3, and can reduce the cavitation allowance (pressure drop) of the double-sided impeller 3, thereby achieving the purpose of preventing the double-sided impeller 3 from cavitation.
Further, as a preferred embodiment, the transmission shaft 2 is provided coaxially with the suction port 6. The suction inlet 6 in this embodiment is annular.
Further, as a preferred embodiment, the outer edge of the other side of the thrust washer 4 is provided with an oblique notch 9, and the liquid inlets 7 of the back impellers are opposite to the oblique notch 9. In this embodiment, as shown in fig. 3, the oblique notches 9 are located right below the liquid inlet 7 of the back impeller, and when fluid on the front side of the double-sided impeller 3 enters the back side of the double-sided impeller 3 through the liquid inlet 7 of the back impeller, the fluid can be uniformly diffused outwards through the oblique notches 9, so that pressure on the back side of the double-sided impeller 3 is uniform, and the axial force on the front side and the back side of the double-sided impeller 3 can be offset conveniently.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (8)
1. A single-inlet double-sided impeller centrifugal pump comprises a shell, and is characterized by also comprising a transmission shaft, a double-sided impeller, a thrust washer and a thrust bearing, wherein the transmission shaft is arranged in the shell, one end of the shell is provided with a suction inlet, one end of the transmission shaft points to the suction inlet, the outer edge of one end of the transmission shaft is provided with the double-sided impeller, a plurality of back impeller liquid inlets are arranged on the double-sided impeller, the liquid inlets of the back impellers are in an annular array, the outer edge of the transmission shaft is also provided with the thrust washer and the thrust bearing, wherein the thrust bearing is positioned at one side of the double-sided impeller far away from the suction inlet, and the thrust washer is arranged between the thrust bearing and the double-sided impeller, one side of the thrust washer abuts against the thrust bearing, and the other side of the thrust washer abuts against the double-sided impeller.
2. The single-inlet double-sided impeller centrifugal pump as claimed in claim 1, wherein the double-sided impeller comprises a disk, an axle, front blades and back blades, wherein the axle is provided at a middle portion of the disk, the axle is sleeved on an outer edge of the transmission shaft, a plurality of the front blades are provided at one side of the disk, a plurality of the back blades are provided at the other side of the disk, and each of the back blades is respectively opposite to one of the front blades.
3. The single-inlet, double-sided impeller centrifugal pump of claim 2, wherein a plurality of said back impeller inlet ports are located outside said axle.
4. The single-inlet double-sided impeller centrifugal pump according to claim 1, further comprising an inducer, wherein the inducer is provided on an outer edge of one end of the transmission shaft, and the inducer is located on a side of the double-sided impeller close to the suction port.
5. The single-inlet double-sided impeller centrifugal pump of claim 4, further comprising a self-locking nut, wherein the double-sided impeller and the inducer are connected to the drive shaft through one of the self-locking nuts, respectively.
6. The single-inlet, double-sided impeller centrifugal pump of claim 4, further comprising a flat key, wherein the inducer is connected to the double-sided impeller by the flat key.
7. The single-intake, double-sided impeller centrifugal pump of claim 1, wherein said drive shaft is disposed coaxially with said suction port.
8. The single-inlet double-sided impeller centrifugal pump as claimed in claim 1, wherein the thrust washer has a chamfered notch formed on the outer edge of the other side thereof, and a plurality of liquid inlets of the back impeller are aligned with the chamfered notch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110019450.5A CN112814913B (en) | 2021-01-07 | 2021-01-07 | Single-inlet double-sided impeller centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110019450.5A CN112814913B (en) | 2021-01-07 | 2021-01-07 | Single-inlet double-sided impeller centrifugal pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112814913A true CN112814913A (en) | 2021-05-18 |
| CN112814913B CN112814913B (en) | 2023-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110019450.5A Active CN112814913B (en) | 2021-01-07 | 2021-01-07 | Single-inlet double-sided impeller centrifugal pump |
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| CN (1) | CN112814913B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3975113A (en) * | 1974-12-31 | 1976-08-17 | Ogles Ethridge F | Centrifugal pump |
| FI881660A0 (en) * | 1988-04-11 | 1988-04-11 | Ahlstroem Oy | FOERFARANDE OCH ANORDNING FOER SEPARERING AV GAS MED PUMPEN UR MEDIET SOM SKALL PUMPAS. |
| CN1040252A (en) * | 1988-08-08 | 1990-03-07 | 英格索尔-兰德公司 | Improved centrifugal pump |
| JPH0942190A (en) * | 1995-07-28 | 1997-02-10 | Nikkiso Co Ltd | Thrust balance mechanism for canned motor pump |
| US5951169A (en) * | 1997-03-27 | 1999-09-14 | Pump Engineering, Inc. | Thrust bearing |
| US20080213093A1 (en) * | 2003-08-04 | 2008-09-04 | Sulzer Pumpen Ag | Impeller for Pumps |
| CN102361698A (en) * | 2009-03-25 | 2012-02-22 | 伍德沃德公司 | Centrifugal impeller with controlled force balance |
| CN103115017A (en) * | 2011-11-16 | 2013-05-22 | 罗伯特·博世有限公司 | Liquid pump with axial thrust washer |
| CN106678050A (en) * | 2015-11-06 | 2017-05-17 | 余姚市巴韵五金制品厂 | Novel variable-frequency pump |
| CN209164160U (en) * | 2018-11-23 | 2019-07-26 | 广州市昕恒泵业制造有限公司 | A kind of axial force balance structure of long-shaft pump |
| CN209687782U (en) * | 2019-01-31 | 2019-11-26 | 平湖佐越机械制造有限公司 | Open impeller of vane pump afterwards |
-
2021
- 2021-01-07 CN CN202110019450.5A patent/CN112814913B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3975113A (en) * | 1974-12-31 | 1976-08-17 | Ogles Ethridge F | Centrifugal pump |
| FI881660A0 (en) * | 1988-04-11 | 1988-04-11 | Ahlstroem Oy | FOERFARANDE OCH ANORDNING FOER SEPARERING AV GAS MED PUMPEN UR MEDIET SOM SKALL PUMPAS. |
| CN1040252A (en) * | 1988-08-08 | 1990-03-07 | 英格索尔-兰德公司 | Improved centrifugal pump |
| JPH0942190A (en) * | 1995-07-28 | 1997-02-10 | Nikkiso Co Ltd | Thrust balance mechanism for canned motor pump |
| US5951169A (en) * | 1997-03-27 | 1999-09-14 | Pump Engineering, Inc. | Thrust bearing |
| US20080213093A1 (en) * | 2003-08-04 | 2008-09-04 | Sulzer Pumpen Ag | Impeller for Pumps |
| CN102361698A (en) * | 2009-03-25 | 2012-02-22 | 伍德沃德公司 | Centrifugal impeller with controlled force balance |
| CN103115017A (en) * | 2011-11-16 | 2013-05-22 | 罗伯特·博世有限公司 | Liquid pump with axial thrust washer |
| CN106678050A (en) * | 2015-11-06 | 2017-05-17 | 余姚市巴韵五金制品厂 | Novel variable-frequency pump |
| CN209164160U (en) * | 2018-11-23 | 2019-07-26 | 广州市昕恒泵业制造有限公司 | A kind of axial force balance structure of long-shaft pump |
| CN209687782U (en) * | 2019-01-31 | 2019-11-26 | 平湖佐越机械制造有限公司 | Open impeller of vane pump afterwards |
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| Publication number | Publication date |
|---|---|
| CN112814913B (en) | 2023-05-05 |
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