CN112814913B

CN112814913B - Single-inlet double-sided impeller centrifugal pump

Info

Publication number: CN112814913B
Application number: CN202110019450.5A
Authority: CN
Inventors: 白高阳; 富绪光; 杜旭明; 梁海琴; 于丰瑞; 罗震宇; 张龙
Original assignee: Xinxiang Aviation Industry Group Co ltd Shanghai Branch
Current assignee: Xinxiang Aviation Industry Group Co ltd Shanghai Branch
Priority date: 2021-01-07
Filing date: 2021-01-07
Publication date: 2023-05-05
Anticipated expiration: 2041-01-07
Also published as: CN112814913A

Abstract

The invention discloses a centrifugal pump with a single inlet and double-sided impeller, which relates to the technical field of centrifugal pumps and 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 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 washer is arranged between the thrust bearing and the double-sided impeller on one side of the double-sided impeller, one side of the thrust washer is propped against the thrust bearing, and the other side of the thrust washer is propped against the double-sided impeller. The invention thoroughly balances the axial force of the centrifugal pump by a simple and reliable structure, thereby increasing the reliability and the service life of the centrifugal pump.

Description

Single-inlet double-sided impeller centrifugal pump

Technical Field

The invention relates to the technical field of centrifugal pumps, in particular to a single-inlet double-sided impeller centrifugal pump.

Background

Axial force of a centrifugal pump is mainly generated by pressure difference between front and back of a rotor, and axial force balance is a problem which a designer must consider, and common balancing methods are as follows: 1. setting a thrust bearing; 2. a balance hole is formed; 3. the double suction impellers are symmetrically arranged; 4. a balancing drum (or balancing disk) is provided.

While for low specific speed centrifugal pumps, if the axial force is balanced by the method, the advantage is obvious, but the disadvantage is that the overall structure is relatively complex.

Disclosure of Invention

The invention aims to provide a single-inlet double-sided impeller centrifugal pump which is used for solving the technical problems.

The technical scheme adopted by the invention is as follows:

the utility model provides a single import double-sided impeller centrifugal pump, includes the casing, still includes transmission shaft, two-sided impeller, thrust washer and thrust bearing, wherein, be equipped with in the casing the transmission shaft, the one end of casing is equipped with the sunction inlet, the one end of transmission shaft is directional the sunction inlet, the outer fringe of one end of transmission shaft is equipped with two-sided impeller, a plurality of back impeller feed inlets have been seted up on the two-sided impeller, and a plurality of back impeller feed inlets are annular array, the outer fringe of transmission shaft still is equipped with thrust washer with thrust bearing, wherein, thrust bearing is located two-sided impeller is kept away from the one side of sunction inlet, just thrust washer locates thrust bearing with between the two-sided impeller, one side of thrust washer support in thrust bearing, the opposite side of thrust washer support in two-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, the wheel shaft can be sleeved on the outer edge of the transmission shaft, one side of the wheel disc is provided with a plurality of front blades, the other side of the wheel disc is provided with a plurality of back blades, and each back blade is opposite to one front blade.

As a further preference, a plurality of back impeller liquid inlets are located outside the axle.

Preferably, the double-sided impeller further comprises an inducer, wherein the inducer is arranged at the outer edge of one end of the transmission shaft, and the inducer is positioned at one side of the double-sided impeller, which is close to the suction inlet.

As a further preferred aspect, the double-sided impeller further comprises a self-locking nut, and the double-sided impeller and the inducer are respectively connected with the transmission shaft through the self-locking nut.

Further preferably, the double-sided impeller further comprises a flat key, and the inducer is connected with the double-sided impeller through the flat key.

Preferably, the drive shaft is disposed coaxially with the suction port.

Preferably, the outer edge of the other side of the thrust washer is provided with oblique notches, and the liquid inlets of the back impellers are right opposite to the oblique notches.

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 through the double-sided impeller, so that the reliability of the pump is improved, and the service life of the pump is prolonged;

(2) In the invention, when the inlet pressure boost is high, the axial force directed to the double-sided impeller from the inlet is generated, and the axial force is born by the thrust bearing and the thrust washer, so that the reliability and the service life of the centrifugal pump are improved;

(3) According to the invention, the double-sided impeller is adopted, so that the axial forces on the two sides of the double-sided impeller are exactly offset, and the service life of the bearing can be prolonged, thereby increasing the reliability and service life of the whole pump.

Drawings

FIG. 1 is a schematic view of a double-sided impeller of the present invention;

FIG. 2 is a schematic illustration of the 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 transmission shaft; 3. a double-sided impeller; 31. a wheel disc; 32. a wheel axle; 33. front blades; 34. a back blade; 4. a thrust washer; 5. a thrust bearing; 6. a suction inlet; 7. a liquid inlet of the back impeller; 8. an inducer; 9. oblique cuts; 10. and a deflector.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. 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.

In the description of the present invention, it should be noted that, if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are used, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the indicated apparatus or element must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance.

In the description of the present invention, it should be noted that unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

FIG. 1 is a schematic view of a double-sided impeller of the present invention; FIG. 2 is a schematic illustration of the 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, a preferred embodiment of a single-inlet double-sided impeller centrifugal pump is shown, which comprises a casing 1, a transmission shaft 2, a double-sided impeller 3, a thrust washer 4 and a thrust bearing 5, wherein the transmission shaft 2 is arranged in the casing 1, a suction inlet 6 is arranged at one end of the casing 1, one end of the transmission shaft 2 points to the suction inlet 6, a double-sided impeller 3 is arranged at the outer edge of one end of the transmission shaft 2, a plurality of back impeller liquid inlets 7 are arranged on the double-sided impeller 3, the back impeller liquid inlets 7 are in an annular array, the thrust washer 4 and the thrust bearing 5 are further arranged at the outer edge of the transmission shaft 2, wherein the thrust bearing 5 is arranged on one side, away from the suction inlet 6, of the double-sided impeller 3, the thrust washer 4 is arranged between the thrust bearing 5 and the double-sided impeller 3, one side of the thrust washer 4 is abutted against the thrust bearing 5, and the other side of the thrust washer 4 is abutted against the double-sided impeller 3. In this embodiment, as shown in fig. 3, the transmission shaft 2 is used to drive the double-sided impeller 3 to rotate; the casing 1 is a centrifugal pump casing 1, and only one and a suction inlet 6 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, which is close to the suction inlet 6, is a front surface, one side of the double-sided impeller 3, which is far away from the suction inlet 6, is a back surface, and the thrust washer 4 and the thrust bearing 5 are both arranged on the back surface of the double-sided impeller 3 and used for bearing the axial force directed to the direction of the double-sided impeller 3 from the inlet, so that the reliability and the service life of the centrifugal pump are improved. The outer edge of the transmission shaft 2 is provided with a step-shaped flange structure which is used for propping against the front surface of the double-sided impeller 3 and bearing the axial force directed to the inlet direction by the double-sided impeller 3. When fluid enters the shell 1 through 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 flows into the back surface of the double-sided impeller 3 through 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 can be applied to the fuel pump of the aircraft engine and has 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, and the other side of the wheel disc 31 is provided with a plurality of back blades 34, and each back blade 34 is opposite to one front blade 33. In this embodiment, as shown in fig. 1, the front blades 33 and the rear blades 34 are each in an arc-shaped structure, and the front blades 33 and the rear blades 34 are all uniformly arranged around the periphery of the hub 32.

Further, as a preferred embodiment, several back impeller inlets 7 are located outside the axle 32. In this embodiment, as shown in fig. 1, the back impeller liquid inlet 7 is located between the axle 32 and the front blades 33, and a baffle 10 is obliquely disposed in each back impeller liquid inlet 7, so that the front fluid of the double-sided impeller 3 can enter into the back of the double-sided impeller 3 quickly, and the effect of counteracting the axial forces on two sides of the double-sided impeller 3 quickly is achieved.

Further, as a preferred embodiment, the double-sided impeller further comprises an inducer 8, wherein the inducer 8 is arranged at the outer edge of one end of the transmission shaft 2, and the inducer 8 is positioned at one side of the double-sided impeller 3 close to the suction inlet 6.

Further, as a preferred embodiment, the double-sided impeller comprises a self-locking nut, and the double-sided impeller 3 and the inducer 8 are respectively connected with the transmission shaft 2 through the self-locking nut.

Further, as a preferred embodiment, a flat key is further included, 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 cavitation of the double-sided impeller 3, 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 through a self-locking nut and transmit torque through a flat key. In this embodiment, the inducer 8 has good cavitation resistance, the inducer 8 belongs to an axial flow impeller, has cavitation characteristics of the axial flow impeller, and the lift generated by the inducer 8 can pre-pressurize the double-sided impeller 3, so that the cavitation allowance (pressure drop) of the double-sided impeller 3 can be reduced, and the purpose of preventing cavitation of the double-sided impeller 3 is achieved.

Further, as a preferred embodiment, the transmission shaft 2 is coaxially disposed with the suction port 6. The suction port 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 back impeller liquid inlets 7 are opposite to the oblique notch 9. In this embodiment, as shown in fig. 3, the oblique incision 9 is located right below the liquid inlet 7 of the back impeller, and when the fluid on the front surface of the double-sided impeller 3 enters the back surface of the double-sided impeller 3 through the liquid inlet 7 of the back impeller, the fluid is uniformly diffused outwards through the oblique incision 9, so that the pressure on the back surface of the double-sided impeller 3 is uniform, and the axial forces on the front surface and the back surface of the double-sided impeller 3 are conveniently counteracted.

The foregoing description is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, and it will be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present invention, and are intended to be included within the scope of the present invention.

Claims

1. The centrifugal pump with the single inlet and the double sides comprises a shell and is characterized by further 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 formed in the double-sided impeller, the back impeller liquid inlets are in an annular array, the thrust washer and the thrust bearing are further arranged on the outer edge of the transmission shaft, the thrust bearing is positioned on one side, far away from the suction inlet, of the double-sided impeller, the thrust washer is arranged between the thrust bearing and the double-sided impeller, one side of the thrust washer is abutted against the thrust bearing, and the other side of the thrust washer is abutted against the double-sided impeller; the back impeller is characterized by further comprising an inducer, wherein the inducer is arranged at the outer edge of one end of the transmission shaft, the inducer is positioned at one side of the double-sided impeller, which is close to the suction inlet, an oblique notch is formed in the outer edge of the other side of the thrust washer, and a plurality of back impeller liquid inlets are right opposite to the oblique notch.

2. The centrifugal pump with single-inlet and double-sided impeller as claimed in claim 1, wherein 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, the wheel shaft can be sleeved on the outer edge of the transmission shaft, one side of the wheel disc is provided with a plurality of front blades, the other side of the wheel disc is provided with a plurality of back blades, and each back blade is opposite to one front blade.

3. The single inlet double sided impeller centrifugal pump of claim 2 wherein a plurality of said back impeller fluid inlets are located outboard of said axle.

4. The single-inlet double-sided impeller centrifugal pump of claim 1, further comprising a self-locking nut, wherein the double-sided impeller and the inducer are each coupled to the drive shaft by one of the self-locking nuts.

5. The single inlet double sided impeller centrifugal pump of claim 1 further comprising a flat key, said inducer being connected to said double sided impeller by said flat key.

6. The single inlet double sided impeller centrifugal pump of claim 1 wherein said drive shaft is coaxially disposed with said suction inlet.