JPS6123897A - Blower for electrical cleaner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a blower used in a vacuum cleaner or the like.

Construction of a conventional example and its problems As shown in FIG. 1, a conventional blower of this type is of a type in which an impeller 1 and a blower guide 2 are arranged in the axial direction and the outer periphery and top thereof are surrounded by a fan case 3. This blower is
A plurality of divided volute chambers 4 are provided on the outer periphery of the impeller 1,
A passage surrounded by a fan case 3 from the pollute chamber 4,
5, and a passage 6 formed below the blower guide 2 to communicate with each other, and the air discharged from the outer periphery of the impeller 1.

This volute chamber 4, the passage 5, the passage 6, the inside of the motor 7, and the exhaust port 8 of the motor were connected to each other.

For this reason, in this type of blower, as shown in Fig. 2, the air that is discharged from the impeller 1 due to centrifugal force and flowing toward the outer circumference is directed through the air passage 6 and back toward the inner circumference. Due to the large direction change, energy loss occurred at the bend, and the air blowing efficiency was not very good.

OBJECTS OF THE INVENTION The present invention overcomes these conventional drawbacks and provides a highly efficient blower for vacuum cleaners.

Structure of the Invention In order to achieve this object, the blower for a vacuum cleaner of the present invention includes a plurality of divided polyneedle chambers provided on the outer periphery of an impeller,
An air guide has an air guide that guides the polyneat chamber to the outer periphery, a communication passage that goes around from the outer periphery to the back side, and an air passage that leads the exhaust gas toward the inside on the back side and leads to the motor intake port. Both the guide and ζ are equipped with a polyneat chamber and a casing forming a communication passage, and the lower surface of the entrance of the air passage is an inclined surface that slopes downward as it moves toward the inner circumference, thereby changing the direction of the air flow. The aim is to reduce loss and improve air blowing efficiency.

DESCRIPTION OF AN EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows a cross section of a blower for a vacuum cleaner according to an embodiment of the present invention. In FIG. 3, reference numeral 21 denotes an impeller, with a suction port 22 opening at the front of its central portion, and a plurality of blades 23 provided around its outer periphery. The blade 23 is sandwiched between chest plates 24 and 25 on both sides, and the outer periphery 26 is open. A shaft 28 of an electric motor 27 penetrates into the center of the impeller 21, and is fastened to the shaft 28 with a nut 29. 30ij: With air guide made of resin molded product.
, a plurality of air passages 3 on the outer periphery of the impeller 21 and below it.
1't- is formed. The air passages 31 are divided by guide vanes 32, and each passage is independent above the air guide 3o. The air passage 31 communicates with a communication passage 33 that continues downward on the outer periphery of the air guide 3o, so that air flows downward from the air guide 3o. The casing 34 surrounds the outer periphery of the air guide 3o, and
The air passage 31 is formed together with the impeller 2.
A suction port 36 facing the suction port 22 of the impeller 21 is opened in the center thereof.

Further, the casing 34 is press-fitted and fixed to the outer periphery of the bracket 36 of the electric motor 27 at the lower part of its outer periphery. FIG. 5 shows the back side of the air guide 30. The air passage 33 is connected to an air passage 37 going inside the air guide 30, and is partitioned by guide vanes 38. air passage 37
meet at their inner end 39 , and opposite this inner end 39 an opening 40 is provided in the bracket 36 of the electric motor 27 .

As shown in FIG. 6, the shoulder portion 41 of the casing 34 is formed into a large round shape, and the lower surface of the air passage 31 is formed with a slope 42 that slopes downward as it moves away from the impeller 21 and toward the outer periphery of the air guide 30. ing. Also air guide 3
On the upper surface of the inlet portion of the rear side air passage 37 of 0, there is an inclined surface 4 that approaches the electric motor 27 side as it goes toward the inner circumference of the air guide 3o.
3 is a provision. Opposed to this inclined surface 43, the lower surface of the inlet of the air passage 37 is provided with a soundproof material (
Similarly, an inclined surface 44 is formed by the sound absorbing material 46.

That is, the inclined surface 44 connects the casing 34 and the bracket 3.
This hole is formed at the corner of 6 and guides the flow of air smoothly.

Regarding the vacuum cleaner blower configured as above,
The operation will be explained below.

As the electric motor 27 operates, the implant 2 along with the shaft 28
1 rotates. Therefore, air flows from the suction port 36 of the casing 34 to the suction port 22 of the impeller 21 to the inside of the impeller 21, is pushed by the pred 23, and is discharged from the outer periphery 26. Further, the air is guided by the guide vanes 32 of the air guide 3o and flows through the air passage 31 toward the outer circumference. The air that has entered below the air guide 3o through the communication path 33 is transferred to the guide vane 3.
8 flows through the air passage 37, and the inner end 39-opening 40-
It flows into the inside of the electric motor 27 and cools the electric motor 27.

From the air passage 31 to the communication passage 33. To explain the flow of air to the air passage 37 in more detail, as shown in FIG.
The air pushed out toward the outer circumference by the impeller 21 is
The slope 42 of the air passage 31 and the shoulder 41 of the casing 34
and is smoothly guided downward and enters the communication path 33. The air flow further passes through the inclined surface 43 at the entrance of the air passage 37.
and 44, and is smoothly guided downward to the inner end 39.
leading to.゛In this way, the airflow does not change at right angles, stagnation, or create turbulence like in the past (Figure 2), and the airflow flows smoothly, making it possible to increase air blowing efficiency to an unprecedented level. . In addition, since the inclined surface 44 is formed of a sound insulating material (sound absorbing material), the noise generated when the airflow pushed out from the impeller 21 toward the outer circumference at high speed hits the guide vane 32 is absorbed and muffled by the inclined surface 44. It can be made into a melon noise.

Note that, as shown in FIG. 6, the inclined surface 44 is connected to the air passage 37.
The angle B of the slope 44 is set to A (B) from the angle A of the slope 43 so that the cross-sectional area of the slope increases as it goes from the inlet to the outlet. Therefore, the exhaust flow from the impeller is Flows more smoothly and without loss.

Further, as the sound absorbing material 45, foamed urethane is generally used.

Effects of the Invention As described above, the present invention has a simple configuration in which the lower surface of the inlet of the inward air passage on the back side of the air guide is an inclined surface that slopes downward as it moves toward the inner circumference, thereby smoothing the air flow. The practical value of this technology is extremely high, as it was able to increase air blowing efficiency to an unprecedented degree by introducing an electric motor into the air.

[Brief explanation of drawings]

Figure 1 is an exploded perspective view of a conventional vacuum cleaner blower;
3 is a partial sectional view of a blower for a vacuum cleaner according to the present invention, FIG. 4 is a top view of the same, and FIG. 5 is a partial sectional view of the same.
The figure is a plan view of the back side of the air guide section, and FIG. 6 is a partial sectional view for explaining the same operation. 21... Impeller, 3o... Air guide, 31.37... Air passage, 33...
...Communication path, 34...Casing, 44...
... Sloped surface, 46 ... Soundproofing material O Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (3)

[Claims] (1) Multiple volute chambers provided around the outer periphery of the impeller,
an air guide that has a communication passage that guides the volute chamber to the outer periphery and goes around from the outer periphery to the back side, and further an air passage that goes inward on the back side and guides exhaust air to the motor intake port;
A casing that surrounds the outer periphery and upper surface of the air guide and forms a volute chamber and a communication passage together with the air guide, and the lower surface of the entrance of the air passage is an inclined surface that slopes downward toward the inner periphery. Air blower for vacuum cleaner. (2) The blower for a vacuum cleaner according to claim 1, wherein the inclined surface of the air passage is formed of a soundproof material. (3) Claim 1 or 2, wherein the slope of the air passage is set to be larger than the slope of the upper surface of the air passage.
A blower for vacuum cleaners as described in Section 1.