CN212838559U - Compact centrifugal pump impeller structure - Google Patents

Abstract

The utility model discloses a compact centrifugal pump impeller structure. The impeller on the centrifugal pump is provided with a plurality of blades, the blades are uniformly distributed at intervals along the circumference, the rotating angle between every two adjacent blades is 72 degrees, each blade is formed by connecting a section of circular arc section close to the center of the impeller and a section of straight line section close to the edge of the impeller, each blade extends to a position close to the center of the impeller from the edge of the impeller, namely the straight line section of each blade extends to the edge of the impeller, and the circular arc section extends to the center of the impeller. The utility model discloses an impeller compact structure can obviously improve the inside flow state of impeller, reduces the energy loss of centrifugal pump, improves the performance of centrifugal pump.

Description

Compact centrifugal pump impeller structure

Technical Field

The utility model relates to a pump body impeller structure who belongs to the fluid machinery engineering field especially relates to a compact centrifugal pump impeller structure.

Background

As a general machine, a pump has been widely used in various fields of national economy, and particularly plays a very important role in the fields of national defense, water conservancy, aerospace, petrochemical industry, and the like. The impeller is the most main overflowing part and acting part in the centrifugal pump and is also the main part generating energy loss, and the quality of the design directly influences the operating efficiency and the operating stability of the pump, so that the impeller has great significance for the optimal design of pump blades.

Secondly, like the aeropump, the structure is required to be small, the power density is high, and the weight is small, so that the research on the direction that the impeller structure is more compact has important significance.

At present, the existing impeller is large in structure, the effective working radius of a blade is smaller than the length of the actual blade, so that the blade does not work sufficiently, and energy loss is serious.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the not enough of above-mentioned background art, provide a compact centrifugal pump impeller structure, enable the impeller do work more fully, reduce energy loss, improve the centrifugal pump performance.

The utility model discloses a following technical scheme realizes:

the utility model discloses impeller on the centrifugal pump is equipped with the multi-disc blade, and the multi-disc blade is along circumference interval evenly distributed, and rotation angle is 72 degrees between two adjacent blades, and every blade is connected by one section circular arc section that is close to the impeller center and one section straightway that is close to the impeller edge and is constituted, and every blade extends to and is close to impeller central point from the impeller edge and puts, and the straightway of blade extends to the impeller edge promptly, and the circular arc section extends to the impeller center.

The straight line section of the blade is a tangent line of the circular arc section, namely the straight line section is tangent to the circular arc section.

The impeller is characterized in that a section of circular arc section close to the center of the impeller is formed by two circular arc subsections which are sequentially connected, and the central angles of the two circular arc subsections are different, so that the impeller blade is formed by two circular arcs with different diameters and a straight line.

The straight line segment of the blade is a tangent of a circular arc subsection far away from the center of the impeller, namely the straight line segment of the blade is tangent to the circular arc subsection far away from the center of the impeller.

Of the two arc subsections, the radius of one arc subsection close to the center of the impeller is 45.76mm, and the radius of one arc subsection far away from the center of the impeller is 68.56 mm.

The blades are bent towards the same rotating direction and are uniformly distributed, and the rotating angle of every two adjacent blades is 72 degrees.

The inlet setting angle of the blade is 32 degrees, the outlet setting angle of the blade is 33 degrees, and the wrap angle of the impeller is 86 degrees.

The utility model discloses the blade comprises the circular arc and one section straight line of two sections different diameters, is the syllogic and distributes, and the effectual blade moulding line length that has reduced has increased the effective radius of actual acting for reduced centrifugal pump energy loss, improved the performance of centrifugal pump, make flow more stable.

The utility model has the advantages that:

through the utility model discloses a compact centrifugal pump impeller can effectually reduce blade profile line length, has increased the effective radius of actual acting for reduce centrifugal pump energy loss, improved the performance of centrifugal pump, make flow more stable.

Drawings

FIG. 1 is a schematic diagram of a prior art impeller of the present invention;

FIG. 2 is a plan view of the novel impeller of the present invention;

FIG. 3 is a view showing the axial structure of the new impeller of the present invention;

FIGS. 4(a), 4(b) are graphs of comparative and new impeller performance, respectively;

FIG. 5 is a graph comparing performance curves for a comparative impeller and a new impeller.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings and examples.

Examples

As shown in fig. 2, the impeller wheel is provided with 5 blades, a plurality of blades are uniformly distributed along the circumference at intervals, and each blade is arranged along the radial direction similar to the spiral. The rotation angle of the adjacent 2 blades is 72 degrees. Each blade is formed by connecting a section of circular arc section close to the center of the impeller and a section of straight line section close to the edge of the impeller, and each blade extends to a position close to the center of the impeller from the edge of the impeller, namely one end of each blade extends to the edge of the impeller, and the other end of each blade extends to the vicinity of the center of the impeller.

In specific implementation, the impeller blade is composed of two sections of arcs 1 and 2 with different diameters and a straight line. The radius of the circular arc 1 is 45.76mm, the radius of the circular arc 2 is 68.56mm, and the straight line of the outlet section is the tangent line of the circular arc 2. The inlet setting angle of the blades is 32 degrees, the outlet setting angle of the blades is 33 degrees, and the wrap angle of the impeller is 86 degrees.

The geometric parameters of the compact impeller of the embodiment are as follows: the impeller is provided with 5 blades which are uniformly distributed, and the rotating angle of every two adjacent blades is 72 degrees and is bent towards the same rotating direction; the thickness of the new impeller blade is 3-5mm, the inlet width A1 of the blade is 11-15mm, the outlet width A2 of the blade is 6-9mm, the inlet radius of the blade is 20-26mm, the outlet radius of the blade is 66-72mm, the inlet setting angle is 30-34 degrees, the outlet setting angle is 31-35 degrees, the wrap angle is 84-88 degrees, the radius of the circular arc 1 is 42-46mm, and the radius of the circular arc 2 is 66-70 mm. The plan view of the new impeller is shown in fig. 2, and the axial view is shown in fig. 3.

Comparative example

The structure of a comparative impeller of the centrifugal pump is shown in figure 1 and is only composed of a section of circular arc.

The geometric parameters of the comparative impellers were: the thickness of the impeller blade is 3-5mm, the inlet diameter is 56mm, the outlet diameter is 142mm, the inlet setting angle is 28 degrees, the outlet setting angle is 34 degrees, the blade wrap angle is 96 degrees, and the number of the blades is 5.

The performance test cases of the examples and comparative examples are:

firstly, a load distribution curve of a new impeller is obtained, euler lift distribution is reversely obtained through the load distribution, and fig. 4(a) and 4(b) are performance curve graphs of a comparison impeller and the new impeller respectively. The Euler lift distribution value of the new impeller obtained by integration is obtained, so that a profile diagram of the Euler lift of the new impeller is obtained. The profile and the actual value curve can be coincided only by translating up and down. The euler head profile of the new impeller is therefore compared with the profile of the comparative impeller, as shown in figure 5. And calculating the proportion K between the difference between the maximum value of the Euler lift value of each sampling point and the Euler lift value of the sampling point at the outlet position of the blade and the Euler lift difference value of the reference blade, wherein the K value is 0.81.

And it can be seen from the figure that the length of the blade of the contra-vane wheel is 87mm, and the limit outer diameter is 0.906L (L is the length of the blade profile line); the length of the new impeller blade is 77mm, the limit outer diameter is 0.951L, therefore, the ratio of the distance between the position of the maximum value point of the Euler lift and the outlet to the whole meridian length is reduced, and the performance is better.

Finally, this practical new impeller satisfies the performance requirement, reasonable in design. The novel impeller is compact in structure, the length of the blade is effectively shortened, the effective radius of actual work is increased, the internal energy loss is reduced, and the performance is effectively improved.

Therefore, the utility model discloses a compact impeller structure blade actually does work effective radius increase for reduced centrifugal pump energy loss, improved the performance of centrifugal pump, make flow more stable.

Claims (7)

1. The utility model provides a compact centrifugal pump impeller structure which characterized in that: the impeller on the centrifugal pump is provided with a plurality of blades, the blades are uniformly distributed at intervals along the circumference, the rotating angle between every two adjacent blades is 72 degrees, each blade is formed by connecting a section of circular arc section close to the center of the impeller and a section of straight line section close to the edge of the impeller, each blade extends to a position close to the center of the impeller from the edge of the impeller, namely the straight line section of each blade extends to the edge of the impeller, and the circular arc section extends to the center of the impeller.

2. A compact centrifugal pump impeller structure according to claim 1, wherein:

the straight line section of the blade is a tangent line of the circular arc section, namely the straight line section is tangent to the circular arc section.

3. A compact centrifugal pump impeller structure according to claim 1, wherein:

the impeller is characterized in that a section of circular arc section close to the center of the impeller is formed by two circular arc subsections which are sequentially connected, and the central angles of the two circular arc subsections are different, so that the impeller blade is formed by two circular arcs with different diameters and a straight line.

4. A compact centrifugal pump impeller structure according to claim 3, wherein:

the straight line segment of the blade is a tangent of a circular arc subsection far away from the center of the impeller, namely the straight line segment of the blade is tangent to the circular arc subsection far away from the center of the impeller.

5. A compact centrifugal pump impeller structure according to claim 3, wherein:

of the two arc subsections, the radius of one arc subsection close to the center of the impeller is 45.76mm, and the radius of one arc subsection far away from the center of the impeller is 68.56 mm.

6. A compact centrifugal pump impeller structure according to claim 1, wherein:

the blades are bent towards the same rotating direction and are uniformly distributed, and the rotating angle of every two adjacent blades is 72 degrees.

7. A compact centrifugal pump impeller structure according to claim 1, wherein:

the inlet setting angle of the blade is 32 degrees, the outlet setting angle of the blade is 33 degrees, and the wrap angle of the impeller is 86 degrees.

Images