HK1130871B - Blade for an impeller wheel - Google Patents

Description

Blade for an impeller

Technical Field

The present invention relates to a blade for an impeller.

Background

In the state of the art today, blades for impellers usually take an integrated, continuous embodiment. With this passing, closed blade structure, disturbing vortices are generated on the back of the blade.

Disclosure of Invention

The aim of the invention is to provide a blade wheel with blades that improve the turbulence conditions on the blade back.

This object is achieved by the invention by means of a blade of the type mentioned at the outset in that a blade for an impeller is proposed, wherein the blade comprises at least two elements, the longitudinal cross section of which has an imaginary centre line which corresponds to the curvature of the blade, wherein the at least two elements are arranged on the imaginary centre line in such a way that the angle between the imaginary centre line and the first element is smaller than the angle between the imaginary centre line and the second element, and the angle between the elements and the imaginary centre line increases from the inside to the outside in the radial direction of the impeller.

In a preferred embodiment of the invention, the elements are separated by an intermediate space and/or are arranged in the form of a laminate.

A further advantage of the invention is that the elements are mounted misaligned.

In a preferred embodiment of the invention, the elements have a curvature in the incident flow direction and are spread apart in the outflow direction. The curvature may be convex or concave.

A further advantage of the invention is that the elements are angled relative to each other.

It is advantageous that the angle of the element to the imaginary blade axis increases from the inside to the outside, i.e. the angle of the element to the imaginary centre line of the blade increases from the inside to the outside in the radial direction of the impeller.

In a preferred embodiment, the distance between the elements may be of equal magnitude.

Drawings

The advantages achieved by the invention can be further elaborated by means of the construction examples shown in the drawings, which are not limited to the above. Examples show that:

FIG. 1 is a schematic cross-sectional view of an impeller equipped with blades known from the prior art;

FIG. 2 is a schematic cross-sectional view of an element consistent with the present invention;

FIG. 3 is a schematic cross-sectional view of an impeller equipped with blades made of elements according to the invention;

FIG. 4 is a schematic cross-sectional view of an impeller having blades formed from elements consistent with the present invention and an imaginary centerline;

fig. 5 is a schematic cross-sectional view of an alternative impeller equipped with blades made of elements according to the invention.

Detailed Description

Fig. 1 is a schematic sectional view of an impeller (3) according to a known embodiment, the impeller (3) according to fig. 1 comprising at least one blade (1) and a hub (2).

Fig. 2 is a schematic illustration of an element (4) according to the invention in an oblique view, one in the direction of the incident flow and the other in the direction of the outflow. The flow direction of the water (5) and the rotation direction of the impeller (6) are also noted in the figure. The element (4) may have a curvature on its side which is in contact with the water and extends in the direction of the hub (2) or the inner end of the element (4) or may be straight. It is particularly advantageous if the curvature is convex or concave.

Fig. 3 shows a special embodiment of the invention. A plurality of blades (1) consisting of elements (4) are mounted on the impeller (3), the position of the elements (4) with respect to the water flow being constantly changed as a result of the entire blade (1) rotating about the hub (2) of the impeller (3). When the blade (1) is immersed (elements (4) follow one another), the outermost elements (4) are in a position in which the resistance to water flow is low. As the blade (1) continues to rotate, the next element (4) inside is also immersed in the water flow. In the position perpendicular to the water flow, the element (4) acts almost as a vane (1) consisting of only one part. When the blade (1) according to the invention is in other positions, a water flow can pass through the intermediate space. This intermediate space characterizes the laminated or slat-type blade (1). Disturbance vortex at the back of the blade (1) is reduced, and the running resistance of the impeller (3) is also reduced. The blade (1) or the imaginary centre line (7) formed by the plurality of elements can be curved or straight.

In an embodiment according to the invention, as shown in fig. 4, the impeller (3) equipped with blades (1) made of elements (4) can be incident from two directions (5), it being necessary to configure the blades (1) in the direction of the water flow to be open or closed, depending on the strength of the water flow.

Fig. 5 shows a particularly effective embodiment of the invention. The longitudinal section of the integrated blade (1) has a midline (7). This median line (7) should correspond to the curvature of the blade (1). At least two elements (4) according to the invention are arranged on an imaginary centre line (7) in such a way that the angle between the imaginary centre line (7) and the first element (4) is smaller than the angle between the imaginary centre line (7) and the second element (4). The intersection points of the elements (4) and the middle line (7) may have equal distances from each other on the middle line (7). In a variant embodiment, the above-mentioned distances may also be different. In a particularly effective embodiment, the size of the elements (4) can be different. The element (4) can be made smaller from the outside inwards. This also results in different distances between the elements (4). This is particularly effective when the above-mentioned distance is reduced from the outside to the inside.

Claims (7)

1. Blade (1) for impeller (3)

The method is characterized in that:

the blade (1) comprises at least two elements (4), the longitudinal cross section of the blade (1) having an imaginary centre line (7), the imaginary centre line (7) corresponding to the arc of the blade (1), wherein the at least two elements (4) are arranged on the imaginary centre line (7) such that the angle between the imaginary centre line (7) and the first element (4) is smaller than the angle between the imaginary centre line (7) and the second element (4), and the angle between the elements (4) and the imaginary centre line (7) increases from the inside to the outside in the radial direction of the impeller (3).

2. Blade (1) according to claim 1

The method is characterized in that:

the elements (4) are arranged separated by an intermediate space.

3. Blade (1) according to claim 1

The method is characterized in that:

the elements (4) are arranged in a laminated manner.

4. Blade (1) according to any of claims 1-3

The method is characterized in that:

the elements (4) are arranged offset.

5. Blade (1) according to any of claims 1-3

The method is characterized in that:

the elements (4) are of blade-type construction.

6. Blade (1) according to any of claims 1-3

The method is characterized in that:

the element (4) has an arc in the direction of the incident flow and extends in the direction of the outflow.

7. Blade (1) according to claim 6

The method is characterized in that:

the arc is convex or concave.