JPH0783197A - Impeller for motor-driven blower - Google Patents

Abstract

PURPOSE:To prevent leakage of air from a gap so as to enhance efficiency by setting a width of a square hole formed on a fan plated approximately the same as a thickness of the blade plate and a thickness of a claw for fixing a blade smaller then a thickness of the blade plate. CONSTITUTION:When an impeller 28 is rotated at a high speed together with a rotor 24, centrifugal force is exerted on air staying between fan blades 32 so that the air is discharged to the outer periphery of the impeller 28 at a high speed. Since a thickness (b) of the fan blade 32 constituting the impeller 28 is approximately the same as a width (a) of a square hole 34 formed on a front fan plate 30 and a back fan plate 31, no gap is generated between the square hole 34 and a claw 33 when the claw 33 is inserted into the square hole 34, thereby preventing leakage of air. Consequently, 100% of air sucked from a suction port 28a of the impeller 28 is discharged from the outer periphery of the impeller 28, thus enhancing efficiency of the impeller 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower.

[0002]

2. Description of the Related Art Conventionally, an electric blower of this type is, for example,
The structure as shown in Japanese Patent Laid-Open No. 54-18764 has been common.

The structure will be described with reference to FIGS. That is, the motor 1 has an outer shell formed by the load side bracket 2 and the anti-load side bracket 3, the shaft 4 rotating to the load side bracket 2 is projected, and the impeller 6 is fixed thereto by the nut 5. An air guide 7 is attached to the outer circumference and the lower side of the impeller 6, and a casing 8 covers the front of the impeller 6. In the central portion of the casing 8, a suction port 8a is provided so as to face the suction port 6a of the impeller 6.
Is open.

The impeller 6 includes a fan plate mae 9, a fan plate USHRO 10, and a plurality of fan blades 1.
It is composed of 1. A plurality of claw portions 11a are formed on the fan blade 11 in the vertical direction, and after they are inserted into a large number of square holes 12 provided in the fan plate mae 9 and the fan plate Ushiro 10, they are caulked,
It is fixed to the fan plate mae 9 and the fan plate Ushiro 10. Claw portion 1 of the fan blade 11
1a had a substantially concave shape as shown in FIG.

[0005]

In the conventional structure as described above, the claw portions of the fan blade are inserted into the square holes provided in the fan plate mae and the fan plate Ushiro and crimped. The width a of the square hole is larger than the thickness b of the fan blade. Therefore, a gap is created after the tab portion is crimped. When the impeller rotates at high speed, air is sucked in from the suction port, but when the suctioned air is discharged from the outer circumference of the impeller due to centrifugal force, air leaks from the gap, so the leaked air is again sucked into the suction port of the impeller. It was sucked in from the air, which reduced the vacuum pressure and reduced the performance.

SUMMARY OF THE INVENTION The first object of the present invention is to solve the above problems and to prevent the air from leaking through the gap formed in the square hole and reduce the performance to improve the efficiency.

The second purpose is to improve the efficiency and
The tip of the claw portion is thinned so that it can be easily inserted into the square hole to improve the assembling property.

A third object is to improve the efficiency by improving the airtightness in the length direction of the claw by forming a substantially concave portion at the base of the claw.

A fourth object is to improve the assemblability and the efficiency by forming a taper at the root of the claw.

[0010]

In order to achieve the first object, the present invention comprises an impeller that rotates with a rotor and a casing that covers the upper part of the impeller, and is fixed to the load side of the rotor. And an air guide for holding the bearing, and a bracket for holding the bearing fixed to the anti-load side, the impeller is composed of a plate mae, a plate Ushiro and a plurality of fan blades, and the fan blade The plurality of claw portions formed are inserted into the plurality of square holes formed in the plate mae and the plate Ushiro, and the plate thickness of the fan blade is substantially the same as the width of the square hole, The tab thickness is smaller than the fan blade thickness.

Further, in order to achieve the second object, the plate thickness of the fan blade constituting the impeller is made substantially the same as the width of the plurality of square holes formed in the plate mae and the plate Ushiro. The plate thickness of the multiple claws formed in is large at the base of the claws and small at the tips.

In order to achieve the third object, the plate thickness of the fan blade constituting the impeller is made substantially the same as the width of the plurality of square holes formed in the plate mae and the plate Ushiro. The plate thickness of the plurality of claw portions formed on the plate is made smaller than the plate thickness of the fan blade, and a substantially concave portion is formed at the base of the claw portion.

Further, in order to achieve the fourth object, the plate thickness of the fan blade constituting the impeller is made substantially the same as the width of a plurality of square holes formed in the plate mae and the plate Ushiro. The plate thickness of the multiple claws formed on the taper is tapered at the root, and the height of the taper is approximately the same as the plate thickness of the plate mae and the plate Ushiro.

[0014]

With the above construction, the gap between the tab portion of the fan blade and the square hole is eliminated, and the air leaking from the gap is eliminated, so that the efficiency of the impeller can be improved.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
It will be explained based on.

Reference numeral 21 is an electric blower main body.
A rotor 24, in which bearings 23 are press-fitted on both sides of a shaft 22, is provided inside an air guide 25 made of resin.
And is held by the bracket 26. The bracket 26 has a substantially cylindrical shape, and holds the brush holder 27 under the bracket 26 and has an exhaust port 26a opened. On the load side of the rotor 24, the shaft 22 penetrates through the air guide 25, the impeller 28 is fixed thereto, and the shaft rotates together with the rotor 24 at a high speed (36000 rpm).
A casing 29 covers the upper side of the impeller 28, and an intake port 29a is opened at the center of the casing 29 so as to face the suction port 28a of the impeller 28. The impeller 28 is composed of a fan plate mae 30 made of aluminum or the like, a fan plate USH 31 and a plurality of fan blades 32. A plurality of claw portions 33 are formed on the upper and lower sides of the fan blade 32, and square holes 34 are formed in the fan plate mae 30 and the fan plate USHRO 31 at positions facing the claw portions 33.

The plate thickness of the fan blade 32 is a square hole 34.
Is substantially the same as the width a of the fan blade 32, and the plate thickness of the claw portion 33 is smaller than the plate thickness of the fan blade 32.

Next, the operation of the configuration of this embodiment will be described. In the above configuration, when the impeller 28 rotates at high speed together with the rotor 24, centrifugal force acts on the air between the fan blades 32, so that the impeller 28 is rotated.
Is discharged at a high speed to the outer circumference. The discharged air is guided to the air guide 25, the vacuum pressure is gradually converted to the atmospheric pressure, and after that, the rotor 24 in the motor body 21 is cooled and then discharged from the exhaust port 26a formed in the bracket 26. To be done. Therefore, an air flow is generated and the casing 2
New air flows in through the intake port 29a of 9 and the intake port 28a of the impeller 28, and the vacuum pressure in the space in front of the casing 29 increases.

Here, since the plate thickness b of the fan blade 32 constituting the impeller 28 is almost the same as the width dimension a of the square hole 34 formed in the fan plate mae 30 and the fan plate Ushiro 31, the claw portion 33 is formed. Since a gap is not formed between the square hole 34 and the claw portion 33 when it is inserted into the square hole 34, it is possible to prevent air from leaking from the gap.
Therefore, 100% of the air sucked from the suction port 28a of the impeller 28 is discharged from the outer circumference of the impeller 28, so that the efficiency of the impeller 28 can be improved.

Next, a second embodiment will be described. The plate thickness b of the fan blade 32 forming the impeller 28 is made substantially the same as the width dimension a of the square hole 34 formed in the fan plate mae 30 and the fan plate Ushiro 31, so that air leakage from the fan plate 32 can be eliminated. .

Further, since the plate thickness of the claw 33 is tapered 35 toward the tip, it is easy to assemble when inserting into the square hole 34, and the width a of the square hole 34 is a.
Since the size is the same as the size in the middle of the tapered portion 35, when the fan blade 32 is assembled to the fan plate mae 30 and the fan plate Ushiro 31, it is press-fitted and the gap can be surely filled. Therefore, the air sucked from the suction port 28a of the impeller 28 is 100
% Since it is discharged from the outer circumference of the impeller 28, the efficiency of the impeller 28 can be improved.

Next, a third embodiment will be described. Since the plate thickness b of the fan blade 32 forming the impeller 28 is almost the same as the width dimension a of the square hole 34 formed in the fan plate mae 30 and the fan plate Ushiro 31, the claw portion 33 is inserted into the square hole 34. At this time, since no gap is formed between the square hole 34 and the claw portion 33, it is possible to eliminate air leakage from here.

Further, since the width c dimension of the claw portion 33 and the length d dimension of the square hole 34 are substantially the same and the substantially concave portion 36 is provided at the base of the claw portion 33, the claw portion 33 is formed into the square hole. Three
The material scraped by the square holes 34 when inserted into the
It is possible to prevent the peripheral portion of the square hole 34 from rising due to the accumulation. Therefore, it is possible to prevent a gap from being generated between the fan blade 32, the fan plate mae 30, and the fan plate Ushiro 31, and to surely fill the gap to eliminate air leakage.

Next, a fourth embodiment will be described. The plate thickness b of the fan blade 32 constituting the impeller 28 is substantially the same as the width dimension a of the square hole 34 formed in the fan plate mae 30 and the fan plate Ushiro 31, and the fan plate mae 30 is formed at the base of the claw portion 33. Since the taper portion 37 is formed with a height approximately the same as the plate thickness e of the fan plate Ushiro 31, when the tab portion 33 is inserted into the square hole 34, the square hole 34 is provided between the taper portion 37 and the tip. Since the width is smaller than the width a, it is easy to assemble, and the final tapered portion 37 is press-fitted to surely fill the gap. Therefore, the square hole 34 and the tab 33
Since there is no gap between the impeller 28 and the air gap, it is possible to prevent air from leaking from the gap and improve the efficiency of the impeller 28.

[0025]

As described above, by eliminating the gap formed between the claw portion formed on the fan blade and the square hole formed in the fan plate MAE and the fan plate Ushiro into which the claw portion is inserted. , By shutting off the air that has leaked from this gap so far and exhausting the air sucked from the impeller to the outer circumference of the impeller,
The efficiency of the impeller can be increased.

[Brief description of drawings]

FIG. 1A is a side view of a claw portion of a fan blade showing one embodiment of the present invention. FIG. 1B is a sectional view of a claw portion of a fan blade showing one embodiment of the present invention.

FIG. 2 is a side view of a fan blade showing an embodiment of the present invention.

FIG. 3 is a sectional view of an electric blower showing an embodiment of the present invention.

FIG. 4A is a side view of a claw portion of a fan blade showing an embodiment of the present invention. FIG. 4B is a sectional view of a claw portion of a fan blade showing an embodiment of the present invention.

FIG. 5 is a side view of a claw portion of a fan blade showing an embodiment of the present invention.

FIG. 6 is a side view of a fan blade showing an embodiment of the present invention.

FIG. 7 is a side view and a sectional view of a claw portion of a fan blade showing an embodiment of the present invention.

FIG. 8 is a half sectional view of an electric blower showing a conventional example.

FIG. 9 is a side view of a fan blade showing a conventional example.

FIG. 10A is a side view of a claw portion of an impeller showing a conventional example. FIG. 10B is a sectional view of a claw portion of an impeller showing a conventional example.

[Explanation of symbols]

 21 Electric Blower Main Body 28 Impeller 29 Casing 30 Fan Plate Mae 31 Fan Plate Ushiro 32 Fan Blade 33 Claws 34 Square Hole 35 Tapered Part 36 Concave 37 Tapered Part

Claims (4)

[Claims] 1. An impeller that rotates together with a rotor, and a casing that covers the upper part of the impeller. The impeller is composed of a plate mae, a plate Ushiro, and a plurality of fan blades. The plurality of claw portions formed are inserted into a plurality of square holes formed in the plate mae and the plate Ushiro, and the plate thickness of the fan blade is substantially the same as or wider than the width of the square holes. An impeller of an electric blower in which the plate thickness of the claw portion is made larger than that of the fan blade. 2. The fan blades constituting the impeller have a plate thickness which is substantially the same as or larger than the width of the plurality of square holes formed in the plate mae and the plate Ushiro, and the plurality of fan blades formed in the fan blades. The plate thickness of the claw part of the electric blower is large at the base of the claw part and small at the tip. 3. The fan blades constituting the impeller have a plate thickness substantially equal to or larger than the width of a plurality of square holes formed in the plate mae and the plate Ushiro, and a plurality of fan blades formed in the fan blades. An impeller for an electric blower in which the plate thickness of the claw portion is smaller than that of the fan blade, and a substantially concave portion is formed at the base of the claw portion. 4. The thickness of the fan blades constituting the impeller is substantially equal to or larger than the width of the plurality of square holes formed in the plate mae and the plate Ushiro, and the plurality of fan blades formed in the fan blades are formed. The plate thickness of the claw part is tapered at the root part, and the height of the taper part is almost the same as the plate thickness of the plate mae and the plate Ushiro.