JP2007506037A - Propeller blower and shell propeller - Google Patents

Abstract

The present invention relates to a propeller blower for discharging air sucked in an axial direction using an impeller disk 2 having a convex blade 1 adjacent to the inside of a flow path. The wing 1 is embodied as an extended and enlarged shell blade. The end region 20 is connected to the impeller disk 2 in the penetration region. The other end 21 extends radially outward and has a radial distance that increases with the axial component in the flow direction.
[Selection] Figure 1

Description

  A propeller for directing the outflow of a gaseous or liquid medium in a substantially axial direction using a hub that defines an internal flow and is formed as an impeller disk and is driven to rotate about a rotational axis. With respect to the blower, the hub includes a blade that is curved in a blade region between a blade inflow end and a blade outflow end in the flow direction.

  A known blower of this kind (100 20878C2: German patent specification) is provided by a guide surface on the outside. In this regard, only a strictly limited suction area can be performed in the axial direction.

  The object of the present invention is to design a propeller blower of a kind in which the sucked medium flows in a hemisphere and flows out into the shaft method so that steam rising in the kitchen is drawn over a wide range without using a hood, for example It is to be.

  Each conveying wing is formed in the shape of an oyster shell extending in the longitudinal direction, one end is connected to the impeller disk, the connection line is perpendicular to the impeller disk, and the other end has a radius in the axial direction. By being directed to increase, the above-described propeller blower is obtained. The wing is curved in a concave shape in the rotational direction.

  The wing has an elliptical extension in the vertical direction, similar to the pearl oyster and margaritana margaritifera. The hub or impeller disk has a flat shape, or is used like a spheroid or in a parabolic or hyperbolic shape.

The proposed propeller blower promotes the medium carried in the inner region beside the shaft, mainly in the radial direction. The conveying blade curved in a concave shape in the rotational direction guides the medium flowing to the outside at the outer end in the axial direction so as not to require a pipe, for example, a pipe. Simple calculations and experiments also show that the media is sucked at the outer edge. This means that the peripheral speed at the outer end is greater than the line speed of the medium that can be achieved by centrifugal force. Thus, for example, warm air rising in the kitchen can be released without a hood. The shape of the wing does not tolerate simple vibrations that cause noise. The measurement results confirm the noise level of the propeller blower, which is a maximum of 8 dB lower than the same size axial blower operating at the same speed. By properly forming the wings, the outflow angle of the medium was successfully opened to about 25 ° with the proposed propeller blower. As a result, since a large amount is taken in from the surrounding medium, it is moved in such a large amount. One of the 14 cm diameter propeller blowers discharging at a maximum limit of 1 m ³ / s at 1250 rev / min was measured. Thus, this small blower can replace a large blower that operates slowly.

Hereinafter, an example of the present invention will be described with reference to the drawings.
According to FIGS. 1 to 3, the impeller disk 2 is driven to rotate about the rotation shaft 3. The direction of rotation is indicated by arrow 5.

  For a better overview, only one wing 1 is shown in FIGS. In actual practice, several wings 1 will usually be attached to the impeller disk, even with different sizes, uniformly or non-uniformly spaced.

  The wing 1 is substantially in the shape of an oyster shell, and is integrally connected to the impeller disk 2 or is incorporated into or bonded to the impeller disk 2. These can be formed by injection parts or molded parts. To this end, the blade 1 and the impeller disk 2 enter a so-called penetration, and a tooth root line 6 is formed so that the outside of the penetration merges with the outflow end of the blade 1. is important. The end opposite to the tooth root line 6 is a blade inflow end 22 into which the medium flows. In FIG. 1, it can be seen by arrow 30 that this blade inlet end extends into the outer region. The wing 1 faces in the axial direction in the region 21, but faces in the radial direction in the region 20.

FIG. 2 shows the specific shape of the blade 1 again, and FIG. 4 shows a cross-sectional view taken along the line AB of FIG. An angle 4 shown in FIG. 4 indicates an inflow angle between the rotational speed vector 5 and the direction of the end of the blade 1.
In FIG. 3, the depression 4 of the impeller disk 2 that contributes to an increase in the radial flow can be recognized before the tooth root line 6. The proposed propeller blower can also drive ships and aircraft.

  For example, a propeller according to the present invention that sucks in a transported medium such as water or air also at the outer end is proposed in FIG. When the suction changes to outflow, the position of the outer end or propeller blade 1 is accurately positioned inside the hole in the surface of the outer wall 10 in the space where the medium flows out as shown in FIG. A new type of propeller arrangement is used which is particularly useful with respect to the suction of air and other liquids drawn from the space. According to FIG. 5, the surface of the outer wall is consequently located near the outer end of the propeller blade 1. Arrow 30 indicates the flow direction. It is further shown in FIG. 5 that the end of the propeller blade 1 is rounded to have no corners, as shown in the lower part of FIG.

  The conically spreading outflow characteristic, which can be expanded somewhat by proper formation, does not require any restricting plates at the inflow or outflow end, and allows air to be blown through the cold-packed cooling tubes. As described above, in order to mitigate the noise generated by the Karman vortex, it is possible to suck the medium from the space where the propeller is located on the suction side in the space and the opening is surrounded by the slotted pipe. .

FIG. 2 shows an impeller disk with only one wing for the propeller according to the invention. It is a figure which shows the wing | blade shown in FIG. 1 isolate | separated from the impeller disk. An impeller disk with dents and wings is shown. FIG. 3 is a cross-sectional view taken along a line AB in FIG. 2. It is a figure which shows the other propeller air blower which concerns on this invention.

Claims (4)

A propeller blower for substantially axially flowing out air sucked by an impeller disk (2) that is driven to rotate about a rotating shaft (3) and restricts a flow path to the inside;
A wing (1) curved in the flow direction (30) in the wing region between the wing inflow end (22) and the wing outflow end;
Each wing (1) is formed in the shape of an oyster shell extending vertically, and its end (20) is connected to the impeller disk (2) in the form of penetration (6), and the free end at the other end (21) extends radially outward and with an axial component in the flow direction extending with increasing radial distance and curved toward the circumferential direction (5) of the rotational drive of the impeller disk (2). Propeller blower.   The carrying wing (1) is arranged in the vicinity of the rotation axis (3) and substantially perpendicular to the vector of the rotation direction, and the inflow end (22) of the wing extends from the inner side to the outer end portion in the rotation direction (5). The propeller blower according to claim 1, wherein the propeller blower is recessed and curved.   The radial extension of the wing has a radial distance to the rotation axis (3), and the tooth root line (6) is located beside the rotation axis (3) in the rotation direction. The propeller blower according to claim 1 or 2, wherein the propeller blower is provided.   The propeller blower according to any one of claims 1 to 3, wherein a recess (4) is formed in the impeller disk (2) in a region in front of the tooth root line (6).

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