CN113090577B

CN113090577B - Centrifugal pump impeller with adjustable blade outlet angle

Info

Publication number: CN113090577B
Application number: CN202110369048.XA
Authority: CN
Inventors: 王勇; 王哓林; 张子龙; 刘厚林; 熊伟; 谈明高; 王凯; 董亮
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2021-04-06
Filing date: 2021-04-06
Publication date: 2023-02-17
Anticipated expiration: 2041-04-06
Also published as: CN113090577A

Abstract

The invention provides a centrifugal pump impeller capable of adjusting an outlet angle of a blade, which comprises the blade, a back cover plate and a back cover plate outer ring, wherein the back cover plate outer ring and the back cover plate outer ring are positioned and installed through an annular guide rail; one end of each blade is arranged on the rear cover plate, and the other end of each blade is arranged on the outer ring of the rear cover plate; the rear cover plate is internally provided with a rotatable gear, the gear is meshed with the outer ring of the rear cover plate, and the outer ring of the rear cover plate rotates along the outer ring of the rear cover plate through rotating the gear, so that the blades are deformed and the outlet angles of the blades are changed. The angle of the blade is adjusted through the gear structure, and the purpose of achieving the best working efficiency under different working conditions is achieved.

Description

Centrifugal pump impeller with adjustable blade outlet angle

Technical Field

The invention relates to the technical field of pumps, in particular to a centrifugal pump impeller with adjustable blade outlet angles.

Background

The pump is used as a general machine, is mainly used for converting mechanical energy of a prime motor into energy of fluid, has various types, and is widely applied to high-tech fields such as national economy departments, spaceships and the like. According to statistics, the power consumption of the pump accounts for 18% of the total power generation, so that the research and design level of the centrifugal pump is improved, and the centrifugal pump has important influence on national economic development, energy conservation and environmental protection.

The centrifugal pump has the characteristics of large flow, high lift and the like, and has extremely important positions in projects such as flood control and drainage, industrial and agricultural water supply, cross-drainage basin water transfer and the like, but the dependence on seasonal and environmental water quantity in the project fields is large, so that the running working condition of the mixed flow pump always needs to be changed, and the performance adjusting means is extremely important.

Among a plurality of pump structural design parameters, the blade outlet placement angle is a key structural parameter which affects performance parameters such as efficiency and cavitation allowance, and has a large influence on the flow inside the pump. At present, the blade setting angle is usually designed by determining a liquid flow angle according to an impeller outlet and selecting an attack angle according to experience so as to calculate the impeller blade outlet setting angle. The design method is a single-working-condition design method based on experience, has a large number of experience factors and does not use scientific theories and mathematical models as supports, so that the determination of the blade outlet installation angle has certain contingency, and the designed impeller cannot be guaranteed to have better hydraulic performance. Therefore, the impeller which can adapt to different flow working conditions and adjust the blade outlet setting angle is designed, the defects of experience of designers can be overcome, the working efficiency of the pump under different flow working conditions is improved, and the impeller has certain practical significance.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the centrifugal pump impeller capable of adjusting the outlet angle of the blades, and the purpose of achieving the best working efficiency under different working conditions can be achieved by adjusting the angles of the blades through a gear structure.

The present invention achieves the above-described object by the following technical means.

A centrifugal pump impeller capable of adjusting an outlet angle of a blade comprises the blade, a back cover plate and a back cover plate outer ring, wherein the back cover plate outer ring and a back cover plate outer ring are positioned and installed through an annular guide rail; one end of each blade is arranged on the rear cover plate, and the other end of each blade is arranged on the outer ring of the rear cover plate; the rear cover plate is internally provided with a rotatable gear which is meshed with the outer ring of the rear cover plate, and the outer ring of the rear cover plate rotates along the outer ring of the rear cover plate by rotating the gear, so that the blades are deformed and the outlet angles of the blades are changed.

Further, the tail part of the blade is connected with the outer ring of the rear cover plate; the front part of the blade is connected with the rear cover plate, and a gap is formed between the middle part of the blade and the rear cover plate; the blades are made of elastic materials, and the tail parts of the blades are driven to rotate through the outer ring rotation of the rear cover plate, so that the blades are deformed.

Further, the gear is fixed on the rear cover plate through a screw, and when the blade outlet angle needs to be adjusted, the screw is loosened to enable the gear to rotate.

The invention has the beneficial effects that:

1. the centrifugal pump impeller with the adjustable blade outlet angle has the advantages that the blade outlet angle can meet the optimal angle under different working conditions by adjusting the blade outlet placement angle of the impeller, and the centrifugal pump can achieve the optimal working efficiency under different working conditions.

2. According to the centrifugal pump impeller with the adjustable blade outlet angle, the blades with the adjustable outlet installation angle can make up for the shortage of experience of designers, and when the design is unreasonable, the blades are adjusted to meet the working requirements.

3. According to the centrifugal pump impeller capable of adjusting the outlet angle of the blade, the gear adjusting structure is hidden in the rear cover plate, so that excessive hydraulic loss is avoided.

Drawings

Fig. 1 is a sectional view of a centrifugal pump impeller with adjustable blade exit angles according to the present invention.

Fig. 2 is a right side view of the centrifugal pump impeller of the present invention with adjustable blade exit angle.

Fig. 3 is a left side view of the centrifugal pump impeller of the present invention with adjustable blade exit angle.

Fig. 4 is a partially enlarged view a of fig. 1.

Fig. 5 is a view from direction B of fig. 1.

FIG. 6 is a schematic view of the centrifugal pump impeller blade adjustment of the adjustable blade exit angle according to the present invention.

In the figure:

1-a blade; 2-rear cover plate; 3-a rear cover plate outer ring; 4-a gear; 5-screw.

Detailed Description

The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, 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 according to specific situations by those of ordinary skill in the art.

As shown in fig. 1, 2 and 3, the centrifugal pump impeller with adjustable blade outlet angle of the present invention comprises a blade 1, a back cover plate 2 and a back cover plate outer ring 3, wherein the back cover plate outer ring 3 and the back cover plate 2 outer ring are positioned and installed through an annular guide rail; one end of the blade 1 is arranged on the rear cover plate 2, and the other end of the blade 1 is arranged on the outer ring 3 of the rear cover plate; the rear cover plate 2 is internally provided with a rotatable gear 4, the gear 4 is meshed with the rear cover plate outer ring 3, and the rear cover plate outer ring 3 rotates along the outer ring of the rear cover plate 2 through the rotating gear 4, so that the blades 1 are deformed and the blade outlet angle is changed.

As shown in fig. 4, the rear cover plate outer ring 3 and the rear cover plate 2 position the rear cover plate outer ring 3 and the rear cover plate 2 through an annular guide rail e, and the rear cover plate outer ring 3 can rotate along the circumferential direction of the outer ring of the rear cover plate 2. The tail part of the blade 1 is connected with the outer ring 3 of the rear cover plate; the front part of the blade 1 is connected with the rear cover plate 2, and a gap is formed between the middle part of the blade 1 and the rear cover plate 2; the blades 1 are made of elastic materials, and the tail parts of the blades 1 are driven to rotate through the rotation of the outer ring 3 of the rear cover plate, so that the blades 1 are deformed.

As shown in fig. 5, the gear 4 is fixed to the rear cover plate 2 by screws 5, and when it is necessary to adjust the blade exit angle, the screws 5 are loosened so that the gear 4 can be rotated. The gear 4 and the rear cover plate outer ring 3 are meshed with each other through teeth, and further the circumferential position of the rear cover plate outer ring 3 around the outer ring of the rear cover plate 2 is controlled.

The working process is as follows: as shown in fig. 6, when the screw 5 is loosened, the gear 4 can be freely adjusted to rotate the rear cover plate outer ring 3 by a certain angle, since the tail of the blade 1 is connected with the rear cover plate outer ring 3; the front part of the blade 1 is connected with the rear cover plate 2, and a gap is formed between the middle part of the blade 1 and the rear cover plate 2; the tail parts of the blades 1 and the outer ring 3 of the rear cover plate are stressed together to rotate for a certain angle, and the blades 1 are made of elastic materials and can deform to a certain degree, so that the shape change of the blade outlet installation angle is met.

In order to form a continuous curved surface in the deformation process of the blade 1, namely, prevent inflection points from appearing on the curved surface, salient points are arranged near the tail part of the blade 1 and used for limiting the deformation direction of the blade 1 and ensuring that the change of the installation angle of the outlet of the blade meets the design requirement.

It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. A centrifugal pump impeller capable of adjusting an outlet angle of a blade is characterized by comprising the blade (1), a rear cover plate (2) and a rear cover plate outer ring (3), wherein the rear cover plate outer ring (3) and an outer ring of the rear cover plate (2) are positioned and installed through an annular guide rail; one end of the blade (1) is arranged on the rear cover plate (2), and the other end of the blade (1) is arranged on the outer ring (3) of the rear cover plate; a rotatable gear (4) is arranged in the rear cover plate (2), the gear (4) is meshed with the rear cover plate outer ring (3), and the rear cover plate outer ring (3) rotates along the outer ring of the rear cover plate (2) through the rotating gear (4), so that the blades (1) are deformed and used for changing the outlet angle of the blades;

the tail part of the blade (1) is connected with the outer ring (3) of the rear cover plate; the front part of the blade (1) is connected with the rear cover plate (2), and a gap is formed between the middle part of the blade (1) and the rear cover plate (2); the blades (1) are made of elastic materials, and the tail parts of the blades (1) are driven to rotate through the rotation of the outer ring (3) of the rear cover plate, so that the blades (1) are deformed.

2. Centrifugal pump impeller with adjustable blade exit angle according to claim 1, characterized in that the gear (4) is fixed to the back cover plate (2) by means of screws (5), and when it is desired to adjust the blade exit angle, the screws (5) are loosened so that the gear (4) can rotate.