JPS6149197A - Motor fan for vacuum cleaner - Google Patents

Abstract

PURPOSE:To aim at enhancing the efficiency of air blow of a motor fan, by providing a casing which defines a communication passage together with an air guide in the motor fan, and by forming, in the air guide, a circular wall for guiding air to the top part of the communication passage. CONSTITUTION:An air guide 30 and passages 31 are formed in the outer peripheral part of an impeller 21 in a motor fan. A circular wall 41 for guiding cischarge air to the top part of the communication passage thereof or the upper parts of guide vanes 32, is integrally formed with the air guide 30. Therefore, the air stream is smoothly turned into the stream which flows downward along communication passage 33, so that the rectifying efficiency of the air guide may be maintained at a higher value, thereby it is possible to enhance the efficiency of air blow.

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.

Structure of the conventional example and its problems As shown in FIG. A plurality of divided polycarbonate chambers 4 are provided in the polycarbonate chamber 4, and a passage 5 surrounded by the fan case 3 and a passage 6 formed below the blower guide 2 are connected to each other. The air discharged from the outer periphery was flowed from the polyto chamber 4 to the passage 5 to the passage 6 to the inside of the motor 7 and to the exhaust port 8 of the motor.

For this reason, in this type of electric blower, as shown in Fig. 2, the air discharged by the impeller 1 due to centrifugal force and flowing toward the outer circumference is directed toward the inner circumference through passage 5 → passage 6. Due to the large direction change, energy loss occurred at the bend, and the air blowing efficiency was not very good. In particular, the shoulder portion 9 of the fan case 3 is bent at a substantially right angle, which causes stagnation of the flow and impedes the rectifying effect of the blower guide.

OBJECTS OF THE INVENTION The present invention overcomes these conventional drawbacks and provides a highly effective electric blower.

Structure of the Invention In order to achieve this object, the blower for a vacuum cleaner of the present invention includes an impeller, a plurality of divided volute chambers provided opposite to the outer periphery of the impeller, and a volute chamber which is guided to the outer periphery. An air guide is provided with a communication passage that goes around from the outer periphery to the back side and an air passage that leads the exhaust gas inward to the motor intake port on the back side. The air guide includes a casing forming a passage, and the air guide has an R-shaped wall formed on the upper part of the communication passage to guide all the air, and smoothly guides the exhaust from the polyto chamber to the communication passage, improving air blowing efficiency. The aim is to

DESCRIPTION OF EMBODIMENTS 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, a suction port 22 is opened at the front of the central portion thereof, and a plurality of blades 23 are provided on the outer periphery of the impeller. The blade 23 is sandwiched between metal side plates 24 and 25 on both sides, and has an outer circumference 26.
is open. A shaft 28 of an electric motor 2 passes through the center of the impeller 21, and is fastened to the shaft 28 with a nut 29. 30 is an air guide made of resin molded product.
A plurality of air passages 3 are provided on the outer periphery of the impeller 21 and below it.
1 fully 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 continuing downward on the outer periphery of the air guide 30, so that air flows to the back side of the air guide 30. Casing 3
4 surrounds the outer periphery of the air guide 3Q, forms an air passage 31 together with the air guide 30, and also connects the impeller 2
A suction port 35 facing the suction port 22 of the impeller 21 is opened in the center thereof. Further, the casing 34 has a bracket 3 of the electric motor 27 below its outer periphery.
It is press-fitted into the outer periphery of 6 and fixed. When the back side of the air guide 30 is shown in FIG. 6, the air passage from the communication passage 33 is connected to the air passage 37 heading inside the air guide 3o.
It is divided by guide wings 38. The air passages 3 meet at their inner ends 39, and opposite the inner ends 39, the electric motor 2
A motor intake port 4° is provided in the bracket 36 of No. 7.

The air guide 3o is integrally formed with an R-shaped wall 41 at the upper part of the communication passage 33, that is, at the upper part of the guide vane 32, for guiding the exhaust gas. This wall 41 is formed on each guide vane 32 and is located inside the shoulder of the casing 34 when the casing 34 is applied.

The operation of the vacuum cleaner blower configured as described above will be described below.

As the electric motor 2 is operated, the impeller 21 rotates together with @28. Therefore, air flows from the suction port 35 of the casing 34 to the suction port 22 of the impeller 21 to the impeller 2.
1, is pushed by the blade 23, and is discharged from the outer periphery 26.

Furthermore, the air is guided to guide R32 of the air guide 3o,
The air flows through the air passage 31 toward the outer circumference. The air that has entered the lower part of the air guide 3o through the communication passage 33 flows through the air passage 37 by the guide vanes 38, and flows from the inner end 39 to the motor intake hole 40 to the inside of the electric motor 27, thereby cooling the electric motor.

To explain in more detail the flow of air from the air passage 31 to the communication passage 33, as shown in FIG.
Since the upper wall 41 of the communication passage 33 is formed in an R shape, the air flow that was flowing toward the outer circumference in the air passage 31 is changed to a flow that smoothly flows downward through the communication passage 33 along this H. There is no need for the flow to change at right angles or for air to become stagnant, as in the conventional case (Figure 2).

Therefore, the rectification effect of the air guide is maintained high,
Air blowing efficiency can be increased compared to conventional blowers. In particular, since the wall 41 is integrally formed with the air guide 30,
This is convenient because the accuracy of the passage is well maintained. That is, wall 4
1 may be removed and the shoulder part 'f of the casing 34 is formed into an R shape, but in this case, the casing 34
However, since the wall 41 is integral with the air guide 3o, the dimensions are determined by the molding of the air guide, so there is no problem as described above. .

Effects of the Invention As described above, the present invention integrally forms an R-shaped wall for guiding air at the upper part of the communication path of the air guide, thereby guiding the air flow more smoothly and improving the blowing efficiency compared to the conventional one. The practical value of this technology is extremely great.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of a conventional vacuum cleaner blower;
3 is a partial sectional view of the vacuum cleaner blower according to the embodiment of the present invention, FIG. 4 is a top view of the same, FIG. 5 is a flat view of the back side of the air guide part, FIG. 6 is a partial sectional view for explaining the same operation. 21...I/Bella-130...Air guide, 33...Communication path, 34...Casing, 41...Wall. Part 2 @ Figure 6

Claims (1)

[Claims] An impeller, a plurality of volute chambers provided opposite to the outer periphery of the impeller, a communication path that guides the volute chambers to the outer periphery, wraps around from the outer periphery to the back side, and guides air inward on the back side to the motor intake port. The air guide includes an air guide provided with an air passage, and a casing that surrounds the outer periphery and upper surface of the impeller and the air guide and forms a communication passage with the air guide, and the air guide has an R for guiding air to the upper part of the communication passage. A blower for vacuum cleaners with an integrally shaped wall.