Centrifugal pump impeller with offset short vanes

Abstract

The utility model relates to a kind of centrifugal pump impeller of offset short blade, comprising: hub, front cover, long blade and short blade, several long blades are fixed between hub and front cover uniformly in circumferential direction, and the same number of short blades as long blade are fixed between hub and front cover, and located in the flow passage formed by two adjacent long blades, and the installation position of short blade is offset to the suction surface side of adjacent long blade in the direction of rotation.Define the circumferential distance of short blade pressure surface to its adjacent long blade suction surface as A, define the circumferential distance of short blade suction surface to its adjacent long blade pressure surface as B, then A+B=L, and A<B.The utility model makes short blade deviate to suction side specific position in flow passage, more active, more effective intervention asymmetric flow field, to optimize the pressure distribution in flow passage, reduce hydraulic loss, finally reach the comprehensive goal of widening high-efficiency zone, improving hydraulic efficiency and enhancing operation stability.

Description

Technical Field

[0001] This utility model relates to a centrifugal pump impeller, specifically to a centrifugal pump impeller with offset short blades that actively and effectively intervenes in an asymmetric flow field, thereby optimizing the pressure distribution within the flow channel, reducing hydraulic losses, and ultimately widening the high-efficiency zone, improving efficiency, and enhancing operational stability. Background Technology

[0002] Centrifugal pumps are widely used fluid transport devices, with the centrifugal impeller being their core working component. To balance high efficiency at high flow rates with operational stability at low flow rates and to avoid humps, the industry commonly employs a design with alternating long and short blades. This design effectively improves velocity and pressure distribution within the flow channel, suppressing secondary flow and flow separation.

[0003] Figure 1 A three-dimensional schematic diagram of a traditional impeller with short blades arranged in the center. Figure 2 A schematic diagram of the existing impeller blade arrangement. (See diagram below.) Figure 1-2 As shown: The centrifugal impeller includes a front cover plate 1, a rear cover plate 2, long blades 3, and short blades 4. The long blades 3 are circumferentially and uniformly fixed between the front cover plate 1 and the rear cover plate 2. The short blades 4 are also fixed between the front cover plate 1 and the rear cover plate 2. 5 and 6 are the pressure surface and suction surface of the long blades, respectively. 7 and 8 are the pressure surface and suction surface of the short blades, respectively. Utility Model Content

[0004] To address the aforementioned problems, the main objective of this invention is to provide a centrifugal pump impeller with offset short blades that actively and effectively intervenes in asymmetric flow fields, thereby optimizing pressure distribution within the flow channel, reducing hydraulic losses, and ultimately widening the high-efficiency zone, improving efficiency, and enhancing operational stability.

[0005] This utility model solves the above-mentioned technical problems through the following technical solution: a centrifugal pump impeller with offset short blades, the centrifugal pump impeller with offset short blades includes: a hub, a front cover plate, long blades and short blades, a number of long blades are circumferentially and uniformly fixed between the hub and the front cover plate, and the same number of short blades as the long blades are fixed between the hub and the front cover plate and located in the flow channel formed by two adjacent long blades, the installation position of the short blades is offset to the suction surface side of the adjacent long blades in the direction of rotation.

[0006] In a specific embodiment of this utility model, the circumferential distance from the pressure surface of the short blade to the suction surface of its adjacent long blade is defined as A, and the circumferential distance from the suction surface of the short blade to the pressure surface of its adjacent long blade is defined as B. Then, A + B = L, and A <B。

[0007] In a specific embodiment of this utility model, the bias ratio is: A / L = 0.35 to 0.45.

[0008] In a specific embodiment of this utility model, the inlet and outlet angles of the short blade are the same as those of the long blade.

[0009] In a specific embodiment of this utility model, the short blade may adopt the same airfoil as the long blade.

[0010] The significant advantages of this invention are as follows: The centrifugal pump impeller with offset short blades provided by this invention has the following benefits: This invention overcomes the shortcomings of the centrally arranged short blades in the prior art by using a centrifugal impeller with offset short blades. This impeller, by positioning the short blades at a specific position on the suction side within the flow channel, more actively and effectively intervenes in the asymmetric flow field, thereby optimizing the pressure distribution within the flow channel, reducing hydraulic losses, and ultimately achieving the comprehensive goals of widening the high-efficiency zone, improving hydraulic efficiency, and enhancing operational stability. This design does not require changes to the overall structure of the impeller (such as diameter, number of blades, etc.), only adjustments to the positioning of the short blades are needed. It is easily implemented within existing design systems and manufacturing processes, with minimal cost increase but significant benefits. Attached Figure Description

[0011] Figure 1 A three-dimensional schematic diagram of a traditional impeller with short blades arranged in the center.

[0012] Figure 2 A schematic diagram of the existing impeller blade arrangement.

[0013] Figure 3 The impeller of this utility model has an offset short blade arrangement.

[0014] Figure 4 The present invention relates to a three-dimensional impeller with short blades arranged non-centrally.

[0015] Figure 5 Schematic diagram of the short blade position.

[0016] The following are the names corresponding to the reference numerals in this utility model:

[0017] In the diagram: 1. Hub; 2. Front cover; 3. Long blade; 4. Short blade; 5. Pressure surface of long blade; 6. Suction surface of long blade; 7. Pressure surface of short blade; 8. Suction surface of short blade. Detailed Implementation

[0018] The preferred embodiments of this utility model are given below with reference to the accompanying drawings to illustrate the technical solution of this utility model in detail.

[0019] Figure 3 The impeller of this utility model features an offset short blade arrangement. Figure 4 The impeller of this invention features a non-centrally arranged short blade in three dimensions. Figure 5 A schematic diagram of the short blade position is shown below. Figure 3-5As shown: the present utility model proposes a centrifugal pump impeller with offset splitter blades, the centrifugal pump impeller with offset splitter blades comprises: a hub 1, a front cover plate 2, long blades 3 and splitter blades 4, a plurality of long blades 3 are circumferentially and uniformly fixed between the hub 1 and the front cover plate 2, the splitter blades 4 the same number as the long blades 3 are fixed between the hub 1 and the front cover plate 2, and are located in the flow channel formed by two adjacent long blades 3, the installation position of the splitter blades 4 is offset toward the suction surface 6 side of the adjacent long blade in the rotation direction.

[0020] Defining the circumferential distance from the pressure surface 7 of the splitter blade to the suction surface 6 of its adjacent long blade as A, and defining the circumferential distance from the suction surface 8 of the splitter blade to the pressure surface 5 of its adjacent long blade as B, then A+B=L and A<B, and the offset ratio can generally be selected as: A / L=0.35-0.45. That is, counting from the suction side, the splitter blade is located at 35% to 45% of the flow channel width.

[0021] In the present utility model, the inlet setting angle and outlet setting angle of the splitter blades are the same as those of the long blades, and the splitter blades can adopt the same airfoil as the long blades.

[0022] The key improvement of the splitter blade of the present utility model lies in that: the installation position of the splitter blade is not centered in the flow channel, but is offset toward the suction surface 6 side of the adjacent long blade, as Figure 3 shown.

[0023] In the present utility model, the circumferential distance from the pressure surface of the splitter blade to the suction surface of its adjacent long blade is smaller than the circumferential distance from the suction surface of the splitter blade to the pressure surface of its adjacent long blade.

[0024] The following is a specific embodiment:

[0025] as Figure 4 and Figure 5 , the centrifugal impeller of the present utility model comprises a hub 1, a front cover plate 2, long blades 3 and splitter blades 4. The long blades 3 are circumferentially and uniformly fixed between the hub 1 and the front cover plate 2. The splitter blades 4 are also fixed between the hub 1 and the front cover plate 2, and located in the flow channel formed by two adjacent long blades 3.

[0026] The key point is that: the circumferential installation position of the splitter blade 4 is closer to the suction surface of the long blade 3 forward in the rotation direction. Through measurement, the ratio of the distance A to the total width L of the flow channel A / L=0.4.

[0027] The purpose of this invention is to overcome the shortcomings of the centrally arranged short blades in existing technologies by using a centrifugal impeller with offset short blades. This impeller, by positioning the short blades at a specific location on the suction side within the flow channel, more actively and effectively intervenes in the asymmetric flow field, thereby optimizing the pressure distribution within the flow channel, reducing hydraulic losses, and ultimately achieving the comprehensive goals of widening the high-efficiency zone, improving hydraulic efficiency, and enhancing operational stability. This design does not require changes to the overall impeller structure (such as diameter, number of blades, etc.), only adjustments to the positioning of the short blades are needed. It is easily implemented within existing design systems and manufacturing processes, with minimal cost increase but significant benefits.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A centrifugal pump impeller with offset short blades, characterized in that: The centrifugal pump impeller with offset short blades includes: a hub, a front cover plate, long blades and short blades. Several long blades are circumferentially and uniformly fixed between the hub and the front cover plate. The same number of short blades as the long blades are fixed between the hub and the front cover plate and are located in the flow channel formed by two adjacent long blades. The installation position of the short blades is offset to the suction side of the adjacent long blades in the direction of rotation.

2. The centrifugal pump impeller with offset short blades according to claim 1, characterized in that: Let A be the circumferential distance from the pressure surface of the short blade to the suction surface of its adjacent long blade, and B be the circumferential distance from the suction surface of the short blade to the pressure surface of its adjacent long blade. Then we have A + B = L, and A <B。 3. The centrifugal pump impeller with offset short blades according to claim 2, characterized in that: The bias ratio is: A / L = 0.35 to 0.

45.

4. The centrifugal pump impeller with offset short blades according to claim 1, characterized in that: The inlet and outlet angles of the short blades are the same as those of the long blades.

5. The centrifugal pump impeller with offset short blades according to claim 1, characterized in that: The short blades can adopt the same airfoil as the long blades.

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