JPS5919838Y2 - cross flow impeller - Google Patents

Description

[Detailed description of the invention] This invention relates to a cross-flow impeller used in blowers, etc.
In particular, it relates to structural improvements to suppress noise generated during operation.

Conventionally, this type of cross-flow impeller, as shown in FIG. 1, supports a large number of blades 3 substantially parallel to the axis of the support member 2 from one side 2a of a disc-shaped or annular plate-shaped support member 2. Generally, a plurality of impeller elements 1 arranged in a ring shape along the periphery of a member 2 are connected with each other in the same direction and with the same axes.

However, since such an impeller element 1 is usually manufactured in one piece by injection molding of synthetic resin, the blades 3 are of a straight type without being twisted in order to be cut out from a mold. When the impeller element is directly connected to another impeller element, as shown in FIG.
The mounting angle of the blade 3 at the other end, that is, the other surface 2b of the other impeller element, was made equal to the mounting angle.

[In addition, the installation angle here means the angle formed by the blade chords N, N and the blade row lines M, M' according to the JIS terminology.

] However, when the mounting angles of the blades 3 are aligned in this way, the phases of the strength and weakness of the wind sent out from the entire surface of the blade 3 match, so that the wind W is directed toward the guide wall X as shown in FIG. The disadvantage was that the cutting phases coincided, producing relatively loud noise.

This invention was made for the purpose of eliminating the above-mentioned drawbacks.

This invention will be explained in detail below based on the embodiments shown in FIGS. 4 to 6.

Note that this invention is not limited to this.

Reference numeral 10 shown in FIG. 4 is an embodiment of the cross-flow impeller of this invention, in which a plurality of impeller elements 11 are connected in the same direction and with their axes aligned.

The impeller element 11 is one side/surface 1 of an annular plate-shaped support member 12.
2a, a large number of blades 13 are arranged in an annular manner along the periphery of the support member 120, and the blades 13 are arranged substantially parallel to the direction of the axis 1, and are integrally manufactured by injection molding of synthetic resin.

Therefore, each blade 13 is straight and not twisted before being connected, and the mounting angle θ1 on one side 12a is about 63°.

In other words, the wedge angle ψ shown in FIG. 5 is approximately 2T.

FIG. 5 is an enlarged view of a part of the support member 12 seen from the other surface 12b side, and the other surface 12b has a recessed hole 15 into which the tip 14 of the blade 13 of another impeller element 11 is fitted. It is set up.

However, its position is different from the position corresponding to the tip 14 of the blade 13, and when the tip 14 of the blade 13 is fitted, the installation angle of the blade on the other surface 12b is approximately 65°. It is tilted.

In other words, the gap angle ψ2 shown in Fig. 5 is approximately 25
° has been.

The opening 16 of the recessed hole 15 widens in a slit shape and includes a position corresponding to the tip 14 of the blade 13.

Therefore, when connecting the impeller elements, the tips 14 of the blades 13 of other impeller elements first come into contact with the openings 16, but as shown in FIG.
Since it has a bee-like shape, if you press it hard, it will slip and fit into the recessed hole 15 naturally.

Therefore, in the end, the blade 13 has a mounting angle of about 63° on one side 12H, and a mounting angle of about 65° on the other side 12b of the other support member, and the mounting angle changes continuously in the middle. Become.

As a result of the blade 13 being twisted as described above, deformation strain occurs in the impeller element, so this is alleviated by annealing.
The impeller elements are then welded or glued together to integrate the whole.

As can be understood from the above description, the cross-flow impeller of this invention is provided with a large number of blades standing upright at a fixed angle in the length direction on one side of a disc-shaped or annular support member, and on the other side. are provided with the same number of recessed holes as the blades, and the opening part of these recessed holes widens in a slit shape so that the blades with the above-mentioned mounting angle can be inserted, and the recessed holes gradually narrow towards the inner part, and the inner part has the same number of mounting angles as the above-mentioned mounting angle. A plurality of integrally molded impeller elements each have a groove shape into which the blades fit at different mounting angles.
It is characterized by being connected on a common axis.

Therefore, the phase of the wind sent out from the entire surface of the blade will shift continuously from one end of the blade to the other, so the phase at which the wind cuts the guide wall will also shift continuously, so The generation of noise will be suppressed compared to the conventional method.

The mounting angle of the blade is selected between approximately 55° and approximately 75°, and the difference between the mounting angle at one end of the blade and the mounting angle at the other end is approximately 6 cm to 1°Ocm depending on the length of the blade. Preferably, a change of about 2° to about 3° per angle is selected.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of an example of a conventional cross-flow impeller;
Figure a is a partial cross-sectional view taken along line II' in Figure 1, Figure 2 is a partial cross-sectional view taken along line II-II' in Figure 1, and Figure 3 is a guide for the cross-flow impeller. FIG. 4 is a front view of essential parts of an embodiment of the cross-flow impeller of this invention, and FIG. 5 is a cross-sectional view of the cross-flow impeller shown in FIG. 4. FIG. 6 is a partial enlarged view of a part of the support member seen from the other side, and FIG.
It is an II' sectional view. 0... Conventional cross-flow impeller, 1... Impeller element, 2
...Supporting member, 2a...one side, 2b...other side, 3
... Vane, K ... Axis of support member, 10 ... Cross-flow impeller of this invention, 11 ... Impeller element, '=12
...Supporting member, 12a...One side, 12b...Other side, 13...Blade, 14...Blade tip, 15...
Recessed hole, 16...Opening, ■...Axis of support member, O.
...Center of support member, N, N'...Chord, M, M
'...Blade row line, C5C'...Campa line, θ1,02
...Mounting angle, ψ1. ψ2...A sharp angle.

Claims (1)

[Scope of utility model registration request] A disc-shaped or annular support member is provided with a large number of blades standing upright at a fixed angle in the length direction on one side, and has the same number of recessed holes as the blades on the other side, and the recessed holes are formed in the opening portion. The blade is spread out in a slit shape so that a blade with the above-mentioned mounting angle can be inserted, and the back part is smoothly clamped, and the back part has a groove shape into which a blade with a different mounting angle from the above-mentioned mounting angle can be fitted. A cross-flow impeller characterized by comprising a plurality of integrally molded impeller elements connected on a common axis.