CN110671358A - A vane design method with controllable load and vane pump designed therefor - Google Patents

Abstract

The invention discloses a blade design method with a controllable load and a designed blade pump, wherein the impeller includes a hub and blades, the blades are arranged on the peripheral surface of the hub along the axis direction, and the blades have a hub side connected to the hub and relatively far away from the hub. On the rim side of the hub, and the opposite ends of the blades have inlet and outlet ends, the distribution law of the velocity moment of the blade along the axial streamline conforms to a preset function. According to the impeller of the embodiment of the present invention, the blade load distribution can be made more uniform, thereby improving the hydraulic and cavitation characteristics of the vane pump, thereby prolonging the service life of the vane pump and the efficiency of the device.

Description

A vane design method with controllable load and vane pump designed therefor

technical field

The invention relates to the technical field of vane pump design, in particular to a vane design method with a controllable load and a vane pump designed therefor.

Background technique

As the most widely used general machinery in all walks of life, vane pumps are not only used in industrial and agricultural fields such as petroleum, chemical industry, water conservancy, and irrigation, but also in national strategic projects such as the South-to-North Water Diversion Project, the Three Gorges Hydropower Station, and the nuclear power plant, and even submarines, ships and other national strategic projects. Aerospace and other cutting-edge technology fields. According to statistics, the fuel consumption of pumps accounts for about 5% of the country's total fuel consumption, and the electricity consumption accounts for about 20% of the country's total power generation. In the petroleum and chemical industries, it is as high as 59% and 26% respectively. my country vigorously advocates energy conservation and emission reduction, and builds a conservation-minded society. Therefore, it is of great significance to optimize the design of the impeller of the vane pump to improve its hydraulic characteristics.

However, in the existing vane pump, due to the unreasonable design of the impeller, after the fluid enters the impeller, the load generated by the fluid on the vane is unevenly distributed, thereby affecting the hydraulic and cavitation characteristics of the impeller pump, thereby reducing the service life of the vane and the device. efficiency.

SUMMARY OF THE INVENTION

The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

To this end, an object of the present invention is to provide an impeller of a vane pump with a controllable load.

Another object of the present invention is to provide a method for manufacturing an impeller of a vane pump.

In order to achieve the above object, an embodiment of the present invention provides an impeller of a vane pump, comprising: a hub and blades, wherein the blades are arranged on the peripheral surface of the hub along an axis direction, and the blades have a connection to the The hub side of the hub and the rim side relatively far from the hub, and the opposite ends of the blade have inlet and outlet ends, and the distribution law of the velocity moment of the blade along the axial streamline conforms to a preset function.

The impeller of the vane pump of the embodiment of the present invention can make the vane load distribution more uniform, thereby improving the hydraulic and cavitation characteristics of the vane pump, thereby prolonging the service life of the vane pump vane and improving the efficiency of the device.

In addition, the impeller of the vane pump according to the above embodiments of the present invention may also have the following additional technical features:

Further, in an embodiment of the present invention, the preset function is:

C _u r=C _u1 r ₁ +(C _u2 r ₂ -C _u1 r ₁ )·f(x),

Wherein, C _u1 r ₁ is the velocity moment of the axial streamline at the inlet end of the blade, C _u2 r ₂ is the velocity moment of the axial streamline at the outlet end of the blade, and f(x) is the shaft The dimensionless cubic polynomial function of the distribution law of velocity moments around the surface streamline, x corresponds to the length of the axial streamline between the predetermined position on the axial streamline and the inlet end and the axis The ratio between the total lengths of the surface streamlines.

Further, in an embodiment of the present invention, the dimensionless cubic polynomial function of the distribution law is:

f(x)=(K ₁ +K ₂ −2)·x ³ +(−2K ₁ −K ₂ +3)·x ² +K ₁ ·x.

Further, in an embodiment of the present invention, the parameter K ₁ and the parameter K ₂ satisfy the following relationship:

0≤K ₁ ≤3, 0≤K ₂ ≤3.

In order to achieve the above purpose, another embodiment of the present invention proposes a method for making an impeller of a vane pump, where the impeller adopts the impeller of the vane pump described in the above embodiments, wherein the method includes: determining the required impeller according to the use requirements of the impeller. The velocity moment C _u1 r ₁ , the velocity moment C _u2 r ₂ and the corresponding dimensionless cubic polynomial function f ( x) to determine the shape of the blade; use interpolation to determine the axial streamlines at other positions on the impeller according to the at least two axial streamlines, so as to manufacture an impeller with a predetermined shape.

The manufacturing method of the impeller of the vane pump in the embodiment of the present invention can make the blade load distribution more uniform, thereby improving the hydraulic and cavitation characteristics of the vane pump, thereby prolonging the service life of the vane pump vane and improving the efficiency of the device.

In addition, the manufacturing method of the impeller of the vane pump according to the above-mentioned embodiment of the present invention may also have the following additional technical features:

Further, in an embodiment of the present invention, the distribution law of the velocity moment C _u1 r ₁ and the velocity moment C _u2 r ₂ along the axial streamline conforms to a preset function, wherein the preset function is:

C _u r=C _u1 r ₁ +(C _u2 r ₂ -C _u1 r ₁ )·f(x),

Wherein, C _u1 r ₁ is the velocity moment of the axial streamline at the inlet end of the blade, C _u2 r ₂ is the velocity moment of the axial streamline at the outlet end of the blade, and f(x) is the shaft The dimensionless cubic polynomial function of the distribution law of velocity moments around the surface streamline, x corresponds to the length of the axial streamline between the predetermined position on the axial streamline and the inlet end and the axis The ratio between the total lengths of the surface streamlines.

Further, in an embodiment of the present invention, the dimensionless cubic polynomial function of the distribution law is:

f(x)=(K ₁ +K ₂ −2)·x ³ +(−2K ₁ −K ₂ +3)·x ² +K ₁ ·x.

Further, in an embodiment of the present invention, the parameter K ₁ and the parameter K ₂ satisfy the following relationship:

0≤K ₁ ≤3, 0≤K ₂ ≤3.

Further, in an embodiment of the present invention, the at least two axial streamlines include an axial streamline on the hub side of the blade and an axial streamline on the rim side of the blade.

Further, in an embodiment of the present invention, the interpolation method is a spline interpolation method, a Lagrange interpolation method, a Newton interpolation method, a Hermite interpolation method or a piecewise interpolation method.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

1 is a schematic structural diagram of an impeller of a vane pump according to an embodiment of the present invention;

2 is a flowchart of a method for manufacturing an impeller of a vane pump according to an embodiment of the present invention;

3 is a schematic diagram of the distribution law of the relative velocity moment of the vane along the length of the axial plane streamline on the hub side and the rim side of the optimal design model of the vane pump according to an embodiment of the present invention.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

The vane design method for a controllable load and the designed vane pump according to the embodiments of the present invention will be described below with reference to the drawings. First, the impeller of the vane pump according to the embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic structural diagram of an impeller of a vane pump according to an embodiment of the present invention.

As shown in FIG. 1 , the impeller 100 of the vane pump includes: a hub 10 and blades 20 .

Wherein, the blade 20 is arranged on the peripheral surface of the hub 10 along the axial direction, the blade 20 has a hub side connected to the hub 10 and a rim side relatively far from the hub, and the opposite ends of the blade 20 have an inlet end and an outlet end. The distribution law of the moment along the axial streamline conforms to the preset function. Compared with the traditional vane pump impeller design method, the impeller 100 of the embodiment of the present invention can make the vane load distribution more uniform, thereby improving the hydraulic and cavitation characteristics of the vane pump, thereby prolonging the service life of the vane pump.

Specifically, the vane pump can be a vane pump. The vane 20 is installed on the outer surface of the hub 10 along the axial direction. At the end and the outlet end, the velocity moment of the blade 20 on the axial streamline conforms to the function C _u r=C _u1 r ₁ +(C _u2 r ₂ -C _u1 r ₁ )·f(x).

Among them, C _u1 r ₁ is the velocity moment of the axial streamline at the inlet end 21, C _u2 r ₂ is the velocity moment of the axial streamline at the outlet end 22, f(x) is the velocity moment of the axial streamline everywhere The dimensionless cubic polynomial function of the distribution law, x corresponds to the ratio between the predetermined position on the axial streamline and the length of the axial streamline between the inlet end 21 and the total length of the axial streamline, f( x) is a dimensionless cubic polynomial function determined according to design requirements, f(x)∈[0,1], f(0)=0, f(1)=1, C _u1 r ₁ , C _u2 r ₂ are based on Design requirements to determine the parameters.

In one embodiment of the present invention, the dimensionless cubic polynomial function can be expressed in the form of f(x)=a·x ³ +b·x ² +c·x+d, where f(0)=0, also That is, d=0(1); f(1)=1, that is, a+b+c=1(2).

In addition, the distribution law of the velocity moment on the axial streamline of the blade 20 conforms to the function C _u r=C _u1 r ₁ +(C _u2 r ₂ -C _u1 r ₁ )·f(x), by reasonably specifying C _u1 r _1. The value of C _u2 r ₂ , that is, the velocity moment at the inlet end and the outlet end of the vane 20, is a predetermined value of the design. This predetermined value can be selected according to the design experience, or can be selected according to the value in the vane pump impeller design manual .

In some embodiments, f'(0)=K ₁ , f'(1)=K ₂ , wherein K ₁ and K ₂ are parameters selected according to design requirements, and the cubic polynomial function is f(x)=(K ₁ +K ₂ -2)·x ³ +(-2K ₁ -K ₂ +3)·x ² +K ₁ ·x. Among them, f'(x)=3ax ² +2bx+c, f'(0)=K ₁ , f'(1)=K ₂ , it can be concluded that c=K ₁ (3), 3a+2b+c= K ₂ (4). Simultaneous equations (1), (2), (3) and (4) can obtain a=K ₁ +K ₂ -2, b=-2K ₁ -K ₂ +3, c=K ₁ , d=0, That is, f(x)=(K ₁ +K ₂ −2)·x ³ +(−2K ₁ −K ₂ +3)·x ² +K ₁ ·x. In addition, K ₁ , K ₂ , C _u1 r ₁ , and C _u2 r ₂ are parameters selected according to the design requirements. In this way, x is the only variable, and there is a one-to-one correspondence between x and C _ur . By determining the value of x, that is, The axial streamline velocity moment of the blade 20 can be determined, and then the distribution law of the blade can be determined, which is convenient for processing and production.

Further, it can be understood that when optimizing the design of the impeller 100 based on the cubic polynomial function, by changing the four parameters K ₁ , K ₂ , C _u1 r ₁ , and C _u2 r ₂ , it is possible to change the parameters from the inlet end 21 of the blade 20 to the The change law of the axial streamline velocity moment at the outlet end 22 of the blade 20, which in turn affects the shape of the blade.

To sum up, the impeller of the vane pump proposed by the embodiment of the present invention can make the vane load distribution more uniform, thereby improving the hydraulic and cavitation characteristics of the vane pump, thereby prolonging the service life of the vane pump vanes and improving the efficiency of the device.

Next, the method for manufacturing the impeller of the vane pump according to the embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a flowchart of a method for manufacturing an impeller of a vane pump according to an embodiment of the present invention.

As shown in Figure 2, the manufacturing method of the impeller of the vane pump, the impeller is the impeller of the vane pump of the above-mentioned embodiment, wherein, the method comprises the following steps:

In step S201 , the velocity moment C _u1 r ₁ , the velocity moment C _u2 r ₂ and the corresponding infinite amount on at least two axial streamlines on the blade in the direction from the hub side to the rim side are determined according to the usage requirements of the impeller Dimensional cubic polynomial function f(x) to determine the shape of the blade.

In one embodiment of the present invention, the at least two axial streamlines include an axial streamline on the hub side of the blade and an axial streamline on the rim side of the blade.

For example, as shown in FIGS. 1 and 3 , the at least two axial streamlines include an axial streamline on the hub side 23 of the blade 20 and an axial streamline on the rim side 24 of the blade 20 . The shape of the blade 20 is determined by the velocity moment of the blade 20 at each point along the axial plane streamline on the blade 20 .

Further, in an embodiment of the present invention, the distribution law of the velocity moment C _u1 r ₁ and the velocity moment C _u2 r ₂ along the axial streamline conforms to a preset function, wherein the preset function is:

C _u r=C _u1 r ₁ +(C _u2 r ₂ -C _u1 r ₁ )·f(x),

Among them, C _u1 r ₁ is the velocity moment of the axial streamline at the inlet end of the blade, C _u2 r ₂ is the velocity moment of the axial streamline at the outlet end of the blade, and f(x) is the distribution law of the velocity moment around the axial streamline A dimensionless cubic polynomial function of A definite continuous function is required.

Further, in an embodiment of the present invention, the dimensionless cubic polynomial function of the distribution law is: f(x)=(K ₁ +K ₂ -2)·x ³ +(-2K ₁ -K ₂ +3) · x ² +K ₁ · x. Wherein, the parameter K ₁ and the parameter K ₂ satisfy the following relational expressions: 0≤K ₁ ≤3, 0≤K ₂ ≤3. It should be noted that those skilled in the art can specify C _u1 r ₁ , C _u2 r ₂ , K ₁ , and K ₂ according to design requirements, which are not specifically limited herein. By giving four parameters of C _u1 r ₁ , C _u2 r ₂ , K ₁ , and K ₂ , the velocity moment of the blade on an axial streamline can be determined, thereby determining the blade geometry; where C _u1 r ₁ , C _u2 r ₂ can be optimized according to design requirements and experience, and K ₁ and K ₂ can be arbitrarily set in the range of 0 to 2.

In step S202, an interpolation method is used to determine axial streamlines at other positions on the impeller according to the at least two axial streamlines, so as to manufacture an impeller with a predetermined shape.

Optionally, in an embodiment of the present invention, the interpolation method may be a spline interpolation method, a Lagrange interpolation method, a Newton interpolation method, a Hermite interpolation method, a piecewise interpolation method, or the like.

The manufacturing method of the impeller of the vane pump will be further described below through specific embodiments and in conjunction with FIG. 1 and FIG. 3 .

Firstly, according to the actual working conditions of the impeller 100, determine the velocity moment C _u1,23 r _1,23 and velocity moment C _u2,23 r _2,23 of the axial streamline of the hub side 23 , and the cubic polynomial function f(x ) in the values of K _23,1 and K _23,2 , while determining the value of the velocity moment C _u1,24 r _1,24 and the velocity moment C _u2,24 r _2,24 of the axial streamline of the rim side 24, and the values of K _24,1 and K _24,2 in the cubic polynomial function f(x), advantageously, for ease of production, C _u2,23 r _2,23 -C _u1,23 r _1,23 =C _u2,24 r _2,24 -C _u1,24 r _1,24 , in this way, the velocity moments between the axial surfaces at both ends of the blade 20 and the hub side 23 and the rim side 24 are determined, thereby determining the shape of the blade 20 . It can be known that there are countless axial streamlines between the 23 axial streamlines on the hub side and the 24 axial streamlines on the rim side. These axial streamlines cannot be exhausted. Therefore, the interpolation method can be used to determine Axial streamlines at other locations, so that the shape of the blades 20 on the hub 10 is determined. Of course, the above embodiments are only illustrative, and should not be construed as limiting the scope of protection of the present invention. For example, any two or three between the axial streamlines on the rim side 24 and the axial streamlines on the hub side 23 can also be selected. or more axial streamlines.

According to the manufacturing method of the impeller 100 according to the embodiment of the present invention, through steps S201 and S202, an impeller 100 that satisfies the cubic polynomial function can be designed. The manufacturing method of the impeller 100 is simple in design and convenient in implementation. The method is applied to the parameter optimization design of the vane pump, which can make the vane load distribution more uniform, thereby improving the hydraulic and cavitation characteristics of the vane pump, thereby prolonging the service life and efficiency of the vane pump.

It should be noted that, the foregoing explanations on the embodiment of the impeller of the vane pump are also applicable to the manufacturing method of the impeller of the vane pump of this embodiment, which will not be repeated here.

The method for manufacturing the impeller of the vane pump according to the embodiment of the present invention can make the blade load distribution more uniform, thereby improving the hydraulic and cavitation characteristics of the vane pump, thereby prolonging the service life of the vane pump vane and improving the efficiency of the device.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present invention. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (10)

1. an impeller of a vane pump, is characterized in that, comprises: a hub; and a blade, the blade is disposed on the peripheral surface of the hub in the axial direction, the blade has a hub side connected to the hub and a rim side relatively remote from the hub, and opposite ends of the blade Having an inlet end and an outlet end, the distribution law of the velocity moment of the blade along the axial streamline conforms to a preset function. 2. The impeller of the vane pump according to claim 1, wherein the preset function is: C _u r=C _u1 r ₁ +(C _u2 r ₂ -C _u1 r ₁ )·f(x), Wherein, C _u1 r ₁ is the velocity moment of the axial streamline at the inlet end of the blade, C _u2 r ₂ is the velocity moment of the axial streamline at the outlet end of the blade, and f(x) is the shaft The dimensionless cubic polynomial function of the distribution law of velocity moments around the surface streamline, x corresponds to the length of the axial streamline between the predetermined position on the axial streamline and the inlet end and the axis The ratio between the total lengths of the surface streamlines. 3. the impeller of vane pump according to claim 2, is characterized in that, the dimensionless cubic polynomial function of described distribution law is: f(x)=(K ₁ +K ₂ −2)·x ³ +(−2K ₁ −K ₂ +3)·x ² +K ₁ ·x. 4. The impeller of a vane pump according to claim 3, wherein the parameter K ₁ and the parameter K ₂ satisfy the following relational expression: 0≤K ₁ ≤3, 0≤K ₂ ≤3. 5. A method of making an impeller of a vane pump, wherein the impeller adopts the impeller of the vane pump of any one of claims 1-4, wherein the method comprises: Determine the velocity moment C _u1 r ₁ , the velocity moment C _u2 r ₂ and the corresponding velocity moment C u1 r 1 on at least two axial streamlines on the blade in the direction from the hub side to the rim side according to the usage requirements of the impeller a dimensionless cubic polynomial function f(x) to determine the shape of the blade; According to the at least two axial streamlines, an interpolation method is used to determine axial streamlines at other positions on the impeller, so as to manufacture an impeller with a predetermined shape. 6 . The manufacturing method according to claim 5 , wherein the distribution law of the velocity moment C _u1 r ₁ and the velocity moment C _u2 r ₂ along the axial streamline conforms to a preset function, wherein the preset The function is: C _u r=C _u1 r ₁ +(C _u2 r ₂ -C _u1 r ₁ )·f(x), Wherein, C _u1 r ₁ is the velocity moment of the axial streamline at the inlet end of the blade, C _u2 r ₂ is the velocity moment of the axial streamline at the outlet end of the blade, and f(x) is the shaft The dimensionless cubic polynomial function of the distribution law of velocity moments around the surface streamline, x corresponds to the length of the axial streamline between the predetermined position on the axial streamline and the inlet end and the axis The ratio between the total lengths of the surface streamlines. 7. preparation method according to claim 6 is characterized in that, the dimensionless cubic polynomial function of described distribution law is: f(x)=(K ₁ +K ₂ −2)·x ³ +(−2K ₁ −K ₂ +3)·x ² +K ₁ ·x. 8. The production method according to claim 7, wherein the parameter K ₁ and the parameter K ₂ satisfy the following relational expression: 0≤K ₁ ≤3, 0≤K ₂ ≤3. 9 . The manufacturing method according to claim 5 , wherein the at least two axial streamlines include an axial streamline on the hub side of the blade and an axial streamline on the rim side of the blade. 10 . . 10 . The production method according to claim 5 , wherein the interpolation method is a spline interpolation method, a Lagrange interpolation method, a Newton interpolation method, a Hermite interpolation method or a piecewise interpolation method. 11 .

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