Axial flow impeller with sectional type blades

Abstract

The utility model provides a sectional blade axial flow impeller which comprises a stirring shaft, a spindle part and a plurality of sectional blades, the spindle part is arranged on the stirring shaft, the periphery of the spindle part is connected with the sectional blades which are evenly distributed in the circumferential direction, and the number of the sectional blades is larger than or equal to 2; the sectional type blade comprises a plurality of sections of straight blade bodies with different torsional angles, the number of the sections is larger than or equal to 2, an arc-shaped partition strip is arranged between every two adjacent sections of blade bodies, an arc-shaped barrier strip is arranged on the outer side of the outermost section of blade body, and the torsional angles of the blade bodies are sequentially and gradually decreased from inside to outside. The incident flow edge of each segment of sheet body is arc-shaped in the thickness direction, and a chamfer is arranged on the back flow edge in the thickness direction. According to the axial flow impeller with the sectional type blades, the axial flow effect similar to that of a propeller type impeller is achieved, the stirring efficiency is high, machining is easy, machining of a high-precision and large machining center is not needed, cost is low, and low-cost machining of an oversized impeller can be achieved.

Description

Technical Field

[0001] This application belongs to the field of electromechanical equipment technology, and specifically relates to a segmented blade axial flow impeller. Background Technology

[0002] In industries such as chemical engineering, wastewater treatment, pharmaceuticals, and food and beverage, it is often necessary to stir large quantities of fluid materials to achieve the purpose of mixing materials and promote reaction processes such as dissolution, crystallization, or biological fermentation. Stirring and mixing are usually accomplished in containers storing fluid materials by driving impellers through a drive shaft.

[0003] With the development of the aforementioned industries and the continuous expansion of production scale, the required mixing volume is also increasing. In order to save on equipment investment, the individual mixing devices are also developing towards larger volume and larger diameter, requiring matching mixing impeller diameters to be larger and larger, reaching 3 to 5 meters, or even more than 6 meters.

[0004] Agitator impellers typically consist of multiple blades. Based on different blade shapes, agitator impellers are classified into frame type, ribbon type, turbine type, paddle type, and propeller type, among others. Different types of impellers produce different fluid flow patterns during rotation, satisfying various material mixing requirements. Paddle impellers or propeller impellers are used to achieve axial flow in the main circulation. Paddle impellers have straight blades, are simple to manufacture, and have low cost, but lower efficiency. Propeller impellers have irregularly shaped, helical twisted surfaces with large inner twist angles and small outer twist angles, resulting in high mixing efficiency. However, they are complex to manufacture, requiring high-precision machining centers, leading to higher costs. Furthermore, as blade size increases, even larger machining centers are needed, further increasing costs. Blade sizes exceeding the machining center's capacity cannot be processed. Summary of the Invention

[0005] To address the aforementioned issues, this application proposes a segmented blade axial flow impeller. The segmented blades, composed of multiple straight blades with different twist angles, achieve an axial flow effect similar to a propeller impeller, resulting in high mixing efficiency. However, the impeller is simple to manufacture, does not require high-precision, large-scale machining centers, and is low in cost. Furthermore, it can enable low-cost manufacturing of ultra-large impellers.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] The segmented blade axial flow impeller described in this application includes a stirring shaft, a spindle section, and multiple segmented blades;

[0008] The stirring shaft is provided with a spindle section, and multiple segmented blades are evenly distributed around the outer periphery of the spindle section, with the number of blades ≥2.

[0009] The segmented blade comprises multiple segments of flat blade bodies with different torsion angles, the number of segments is greater than or equal to 2, a circular arc-shaped partition strip is arranged between adjacent segments of the blade bodies, a circular arc-shaped blocking strip is arranged on the outer side of the outermost segment of the blade bodies, and the torsion angle of the blade bodies gradually decreases from large to small from inside to outside.

[0010] The thickness direction of the inflow edge of each segment of the blade is arranged in a circular arc shape, and the thickness direction of the backflow edge is arranged with a chamfer. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a three-dimensional schematic view of the segmented blade axial flow impeller described in the present application.

[0012] Figure 2 It is a vertical view schematic view of the segmented blade axial flow impeller described in the present application.

[0013] Figure 3 It is a top view schematic view of the segmented blade axial flow impeller described in the present application, and the arrows in the figure indicate the inside and outside directions described herein.

[0014] Figure 4 It is a A-A arc cross-sectional view of Figure 3

[0015] Figure 5 It is a B-B arc cross-sectional view of Figure 3

[0016] Figure 6 It is a C-C arc cross-sectional view of Figure 3

[0017] The serial numbers in the above figures are: stirring shaft 1, spindle part 2, segmented blade 3, inner segment blade body 31, middle segment blade body 32, outer segment blade body 33, partition strip 34, blocking strip 35. DETAILED DESCRIPTION

[0018] The specific implementation of the segmented blade axial flow impeller described in the present application is as follows:

[0019] In combination with Figure 1 , Figure 2 The segmented blade axial flow impeller proposed in the present application comprises a stirring shaft 1, a spindle part 2 and multiple segmented blades 3.

[0020] The stirring shaft 1 is provided with a spindle part 2, and the outer periphery of the spindle part 2 is connected with multiple segmented blades 3 which are uniformly distributed in the circumference.

[0021] In combination with Figure 1 , Figure 3 ​​​, the segmented blade 3 comprises multiple segments of different torsion angles, from inside to outside, the inner segment blade 31, the middle segment blade 32 and the outer segment blade 33, and the adjacent segment blades are provided with arc-shaped partition strips 34, the outer side of the outer segment blade 33 is provided with an arc-shaped blocking strip 35, and the centers of the arc-shaped partition strips 34 and the blocking strip 35 are on the axis of the stirring shaft 1; the inner segment blade 31, the middle segment blade 32, the outer segment blade 33 and the adjacent partition strips 34 and the blocking strip 35 are welded together to form a segmented blade 3, which is then welded to the spindle part 2; multiple identical segmented blades 3 are evenly distributed along the outer circumferential circle of the spindle part 2 to form an impeller.

[0022] In combination Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 , from inside to outside, from the inner segment blade 31, the middle segment blade 32 to the outer segment blade 33, the angle between the neutral plane and the rotation plane of the impeller (hereinafter referred to as the torsion angle) gradually decreases in order, that is, the torsion angle A1>A2>A3.

[0023] Further, as shown in Figure 4 、 Figure 5 、 Figure 6 , the thickness direction of the flow-attacking edge of each segment is arc-shaped, and the thickness direction of the backflow edge is chamfered, which is beneficial to reduce the ineffective resistance and improve the efficiency.

[0024] It should be particularly noted that:

[0025] The number of segments of the segment blade 3 is not limited to 3 segments as shown in the figure, and the number of segments is greater than or equal to 2, and 3 segments are only used as an example herein;

[0026] The number of segmented blades 3 is not limited to 5 pieces as shown in the figure, and the number of pieces is greater than or equal to 2, and 5 pieces are only used as an example herein.

[0027] The segmented blade axial flow impeller described in the present application has the following beneficial effects:

[0028] The segmented blade 3 comprises segmented blades, which are flat and straight, and only need to be simply processed, with low cost;

[0029] The torsion angles of the segmented blades of the segmented blade 3 gradually decrease from inside to outside, and when the impeller rotates, the inner side has a smaller rotation circumference than the outer side, but the inner side has a larger torsion angle and the outer side has a smaller torsion angle, which can ensure that the fluid volume stirred by the inner and outer blades is basically the same, realizing the axial flow effect similar to the propeller type impeller, and improving the stirring efficiency;

[0030] The partition strips 34 and the blocking strip 35 of the segmented blade 3 play a role in combing and blocking the centrifugal flow of the fluid when the impeller rotates, which is beneficial to the axial ordered flow of the fluid and further improves the stirring efficiency;

[0031] The segmented blade 3 is composed of multiple segments, the number of segments can be increased as needed, the overall size is not limited by the processing equipment, and low-cost processing of oversized impellers can be achieved.

Claims

1. A segmented blade axial impeller, characterized in that: the segmented blade axial impeller comprises a stirring shaft (1), a spindle part (2) and a plurality of segmented blades (3); the stirring shaft (1) is provided with the spindle part (2), and the spindle part (2) is connected with the plurality of segmented blades (3) which are circumferentially distributed, and the number of the segmented blades (3) is greater than or equal to 2; the segmented blade (3) comprises a plurality of flat segment bodies with different torsion angles, and the number of the segment bodies is greater than or equal to 2, and a circular arc-shaped partition strip (34) is arranged between adjacent segment bodies, a circular arc-shaped blocking strip (35) is arranged on the outer side of the outermost segment body, and the torsion angle of the segment body gradually decreases from large to small from inside to outside.

2. The segmented blade axial impeller of claim 1, wherein: The thickness direction of the inflow edge of each segment body of the segmented blade (3) is arranged in a circular arc shape, and the thickness direction of the backflow edge is arranged with a chamfer.

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