JPS5868000A - Electric blower - Google Patents

Abstract

PURPOSE:To improve the fluid performance by forming a return guide vane in a swastika shape to form a fluid passage having a comma-shaped section between individual vanes so as to make the outlet shape of the passage same as the suction port shape of a motor and to make the connection of fluid passages smooth. CONSTITUTION:A return guide vane 10 is formed with swastika-shaped member radially arranged with a plurality of curved vanes 10a made thinner at the periphery and thicker near the center, and comma-shaped bead-like section of fluid passage 10b is formed between individual vanes 10a and the outlet section of the fluid passage 10b is formed in the same shape as that of the suction port 13 of a motor. Therefore, the flow entering through the inlet of the return guide vane 10 is continuously decelerated and undergoes a direction change and goes into the motor smoothly, thus the fluid performance can be remarkably improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a household--A home delivery system, and particularly to its fluid performance.

A conventional blower will be explained with reference to FIGS. 1 to 4. FIG. 1 is a longitudinal cross-sectional view of an electric blower, with 1
represents a four-motor, and a centrifugal impeller 3 is fastened to one end of a rotating shaft 2 with a nut 4. A casing 5 is disposed outside the impeller 3 and has a substantially conical surface and a sunny side. It fits into a disc-shaped end bracket 6 provided on the shoulder of the machine to form a space inside.

It stores the l4tr feather table. Inside the casing 5, a disk-shaped partition plate 7 is located on the rear surface (anti-suction side) of the blade 3, and is fixed to the end bracket 6 and the electric motor 1 with bolts 8 at multiple locations in the circumferential direction. On the front surface (suction side) of the partition plate 7 and on the outer periphery of the impeller 3, diffuser blades 9 in the form of one circular blade row are protruded, and on the rear surface of the partition plate 7, a return guide 1L10 is protruded. forming a fluid passageway; Further, an annular gap 11 is formed between the outer peripheral end of the partition plate 7 and the inner peripheral surface of the casing 5. As the impeller 3 rotates, air is sucked in from the suction port 12 and compressed by one impeller, and then flows through a fluid passage consisting of a diffuser blade 91, an annular gap 11, and a return inner blade 10 to be decelerated. The dynamic pressure is converted into static pressure, which flows into the inside of the motor through the intake port 13 provided at the end bracket 6 and the end of the motor, cools the lower motor, and then is installed at the other end or side of the motorized rock. from an opening (not shown). Figure 2, Figure 3,
and FIG. 4 are axial views of the diffuser blade, the inner part of the return valve, and the intake port, respectively.

Diffuser X used in the electric blower with the above configuration
The configuration of the % return kettle inner blades, etc. is similar to that of conventionally used large-sized blowers and compressors, but %'*@blowers have particular restrictions on size, shape, etc. In other words, in a large machine, the ratio of the diffuser outlet diameter to the inlet diameter is 1.
It is normal to take a large value of about 4 to 2, but in a dynamic blower, it can only take a small value of about 1.15 to 1.25, and the axial dimension is also extremely limited. ing. Therefore, there is no room to provide sufficient bends in the flow path from the return 9 guide wax to the electric drive 1. However, the conventional #L forced air blower does not take any measures to construct an efficient fluid passage within such a restricted space, and therefore has low fluid performance.

There were drawbacks such as high noise levels.

In particular, as shown in Figure 4, the intake port of the -127 aircraft usually consists of multiple sectors, and although it has a finite 1- partition, the return guide vanes are arranged regardless of the shape of the intake port. As a result, the flow path at the outlet of the guide vane becomes discontinuous, which has the disadvantage of significantly impairing fluid performance.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric blower for use in a home electric blower that eliminates the above-mentioned drawbacks and has high fluid performance.

The feature of this invention is that the return guide vanes provided on the rear surface of the partition plate are made of a tortoise-shaped vane in which a plurality of curved members are arranged in the circumferential direction and are thin at the outer periphery and thicken as they get closer to the center. The shape of the outlet part of this fluid passage is almost the same as the shape of the intake port of the electric motor, so that the fluid passages connect smoothly. be.

An embodiment of this invention will be explained with reference to FIG.

(Illustrations and explanations of the same parts as in Figs. 1.2.4 are omitted.) Fig. 5 is an axial view showing the shape of the return guide vane, and corresponds to Fig. 3 of the conventional product. The return guide vanes have an inclination of τ exclusively at the inlet and close to the circumferential direction (the angle of this inclination is determined corresponding to the outflow angle of the air flow from the diffuser), while being curved and increasing in thickness toward the center,
A plurality of [10a] located in the center and facing in the radial direction are arranged in the circumferential direction, and the whole is formed in a tomo-shaped shape.

Between each wing, the same number of fluid passages 10b as in the Ail wing are formed, which are narrower on the outer circumferential side and become wider while curving toward the center. The outlet side portion of this fluid passage is formed in substantially the same shape as the intake port 13 of the ridge injection machine shown by the broken line. Therefore, the flow flowing in from the inlet (outer periphery) of the return guide vane is continuously decelerated and direction-changed so that it can smoothly flow into the guide plane. On the other hand, in conventional products, the relationship between the returning inner blade and the intake port is irregular.

The shape and resistance of the outlet are different for each fluid passage, causing a significant drop in fluid performance, instability, and noise generation.

Further, according to the present invention, since the mounting port 8 shown in FIG. 1 can be accommodated within the true wall thickness, pressure loss caused by this can also be eliminated.

Since the partition plate, diffuser reduction, and return guide vanes are all integrally molded from synthetic resin or the like, their manufacture is streamlined, and if the thick portion of the return guide vanes is made hollow, no increase in heavy noise will be caused.

@Figure 6 shows another embodiment of this invention.

A thin intermediate JIlt10C is provided at a position that almost equally divides the fluid passage 10b of the return guide vane. Same as 10a). This intermediate wing is effective when the number of main wings is relatively small (for example, 4) or when the inlet angle is large, and it can increase the flow guiding effect and improve fluid performance without increasing pressure loss. can.

Fig. 7 shows the effect of the practical example of Joki, and is a graph showing the IA relationship between the wind tQ of the blower and the pressure (silence [)H]. In the figure, the solid lines A and B are the characteristic curves of the blower according to the present invention (with medium + dJ blades, A, BFi with different shapes of diffusers), and the broken line A'.

B' corresponds to A and B, respectively, and indicates the case where the returned Kurouchi mime is Takumai type. As shown in the figure, the characteristics (generated pressure) of the blower according to the present invention exceed those of conventional products, and the difference in large air volume is significant. In other words, it can be seen that as the air volume increases, the flow loss from the return inner wing to the ITS air intake is reduced, and the pressure drop is small.

As can be seen from the above description, in the present invention, the return guide vane is made of a tome-like member in which a plurality of curved ratio vanes are arranged radially, and are thin at the outer periphery and thicken toward the center. By forming a magatama-shaped fluid passage in between, the shape of the passage of the return guide vane of the electric blower, especially the shape of the inflow to the intake port of the electric motor, was streamlined.

The fluid performance can be improved without breaking the mold or increasing the manufacturing cost, and it is possible to provide a high performance cleaning surface.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing a conventional electric blower, Fig. 2 is an axial same view of the diffuser shown in Fig. 1 (view from the ■ arrow), and Fig. 3 is an axial same view of the return guide vane shown in Fig. 1. Figure (■ arrow view), 4th
The figure is an axial isometric view (■ arrow view) of the suction A port, and FIG. 5 is a blower characteristic diagram of the #kL@hts style blower of the present invention. 3... Impeller, 7... Partition plate, 9... Diffuser blade, 10... Return guide g, iob... Fluid passage,
IOC...Intermediate wing, 13...Intake port. °I' ′! 5 (eye 2nd mouth ¥J 3 ward lθ 4th mouth ¥J s figure

Claims (1)

[Claims] 1. A centrifugal impeller is coupled to a rotating shaft of an electric motor, a cylindrical casing is provided on the outside of the centrifugal impeller, and a disc-shaped partition plate is arranged on the back side of the impeller. A diffuser is provided on the outer periphery of the impeller on the front surface of the partition plate, return guide vanes are protruded from the rear surface of the partition plate, and an annular gap is formed between the outer peripheral end of the partition plate and the casing. The iJE motor has a plurality of fan-shaped intake ports at the end of the impeller side. It is characterized by being made up of radially arranged tomo-like members, forming a square-shaped fluid passageway between each leg, and an outlet portion of this fluid passageway having approximately the same shape as the intake port. 2. An electric blower according to claim 1, characterized in that a thin intermediate blade is disposed between the return beam inner blades.