JP4140330B2 - Electric blower and electric vacuum cleaner using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric blower and a vacuum cleaner using the same.
[0002]
[Prior art]
Efforts to reduce the noise generated from the electric blower are continued, and the electric blower is used for a vacuum cleaner or the like. FIG. 11 is an example for explaining the structure of a conventional electric blower.
[0003]
Conventionally, a commutator type electric blower 1 having a carbon brush as shown in FIG. 11 is often used for a vacuum cleaner. Reference numeral 2 denotes a stator formed by applying field windings to the field core 3, and 5 denotes an electric element windings 8 applied to an electric core 7 that is passed through a shaft 6 that is an output shaft, thereby performing a rectifying action and performing the surface of resin parts Is a rotor fixed rotatably by bearings 10 provided at both ends of the shaft 6.
[0004]
The stator 2 and the rotor 5 are covered by both the load side bracket 11 and the anti-load side bracket 12, and a pair of carbon brushes 14 are inserted into the anti-load side bracket 12 via the brush holder 13 to thereby install the motor unit 15. Forming. Reference numeral 20 denotes a power supply terminal, and 19 denotes an intake port.
[0005]
Further, the shaft 6 of the output shaft is provided with a centrifugal fan 16, and an air guide 17 that forms a ventilation path is disposed on the outer periphery of the centrifugal fan 16, and the fan casing 18 covers the fan portion 22. Was configured. An insulating member is interposed between the commutator 9 and the bearing 10. Further, an exhaust hole 21 is provided in the fan casing 18.
[0006]
In the above configuration, when power is supplied to the power supply terminal 20, the current conducted through the field winding is transmitted to the commutator 9 through the carbon brush 14, and the magnetic flux generated in the field core 3 and the electric winding 8 are connected. A force is generated between the passing current and the rotor 5 rotates.
[0007]
Next, when the rotor 5 is rotated, the centrifugal fan 16 fixed to the shaft 6 of the rotor 5 is rotated, the air sucked from the air inlet 19 of the fan casing 18 is increased, and the increased air is air. It is decelerated by the guide 17 and flows inside the motor, and is exhausted rearward from the plurality of openings 23 of the anti-load side bracket 12 while cooling the rotor 5, the stator 2 and the carbon brush 14.
[0008]
Furthermore, in order to reduce the ventilation resistance and improve the performance of the electric blower, a part of the sent air is directly exhausted to the outside through the exhaust hole 21. (For example, see Patent Documents 1 and 2).
[0009]
[Patent Document 1]
JP-A-10-299698 (page 2-5)
[Patent Document 2]
JP 2001-169521 A (page 6, FIG. 9)
[0010]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, the noise value of the electric blower itself is high due to wind noise from the exhaust hole 21 of the fan casing 18.
[0011]
The present invention is intended to solve the problems of the conventional configuration as described above, and an object thereof is to provide an electric blower with less operation noise.
[0012]
[Means for Solving the Problems]
To achieve the above object, the present invention provides a motor unit, a centrifugal fan driven by the motor unit, an air guide for rectifying air blown from the centrifugal fan and guiding the air to the motor unit, and a fan unit A fan casing is formed on the outer periphery of the fan casing, and an exhaust hole for directly discharging a part of the air sent from the centrifugal fan to the outside is formed. Provide a cover, fill the gap between the soundproof cover and the fan casing with a sound absorbing material , block the wind noise generated in the exhaust holes with this soundproof cover , and fill the sound absorbing material to leak noise In addition, a further soundproof effect can be obtained .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
This onset Akira includes a motor unit, a centrifugal fan driven by the motor unit, the rectifying the air blown from the centrifugal fan, and an air guide for guiding to the motor unit, and a fan casing covering the fan unit In addition, an exhaust hole for directly discharging a part of the air sent from the centrifugal fan to the outside is formed on the outer periphery of the fan casing, and a cylindrical soundproof cover is provided at a distance from the exhaust hole, and the soundproof cover And a fan casing, a clearance is formed, and the clearance is filled with a sound absorbing material. With this configuration, wind noise generated at the exhaust hole of the fan casing can be blocked. In addition, the leakage of noise is suppressed, and a further soundproofing effect is obtained.
[0014]
The present invention also includes a motor unit, a centrifugal fan driven by the motor unit, an air guide that rectifies the air blown from the centrifugal fan and guides it to the motor unit, and a fan casing that covers the fan unit. In addition, an exhaust hole for directly discharging a part of the air sent from the centrifugal fan to the outside is formed on the outer periphery of the fan casing, and a cylindrical soundproof cover is provided at a distance from the exhaust hole, and the soundproof cover A plurality of holes are provided on the outer periphery of the slab, and the outer sides of these holes are covered with a sound deadening cover to form a sound deadening chamber, or the sound deadening chamber is filled with a sound absorbing material. With this configuration, the performance is improved by reducing the decrease in the exhaust wind speed, and there is a further effect of soundproofing.
[0015]
The present invention also includes a motor unit, a centrifugal fan driven by the motor unit, an air guide that rectifies the air blown from the centrifugal fan and guides it to the motor unit, and a fan casing that covers the fan unit. In addition, an exhaust hole for directly discharging a part of the air sent from the centrifugal fan to the outside is formed on the outer periphery of the fan casing, and a cylindrical soundproof cover is provided at a distance from the exhaust hole, and the soundproof cover A plurality of curved guide vanes are provided, or a gap between the guide vanes is filled with a sound absorbing material. With this configuration, the flow of air flowing into the soundproof cover from the exhaust hole is smoothed, and there is a further effect of soundproofing.
[0016]
Furthermore, by using the electric blower according to the present invention for a vacuum cleaner, it is possible to provide a vacuum cleaner that can ensure high performance and reduce noise by reducing the decrease in the exhaust wind speed.
[0017]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
(Example 1)
In FIG. 1, the electric blower includes a commutator type motor unit 31 and a fan unit 32. A motor unit 31 having a carbon brush 33, a centrifugal fan 34 driven by the motor unit 31, an air guide 35 for rectifying the air blown from the centrifugal fan 34 and guiding it to the motor unit 31, and the fan unit 32 And a fan casing 36 for covering.
[0018]
In order to prevent exhaust resistance, an exhaust hole 37 for exhausting a part of the air sent from the centrifugal fan 34 directly to the outside is formed on the outer periphery of the fan casing 36. However, since noise due to wind noise in the exhaust hole 37 of the fan casing 36 is generated, a cylindrical soundproof cover 38 is provided at a distance X from the exhaust hole 37.
[0019]
The soundproof cover 38 is formed with a gap X between the fan casing 36 and an upper portion thereof closed and a lower portion thereof opened. The wall height A of the soundproof cover 38 and the wall height B of the fan casing 36 are equal. did.
[0020]
In the above configuration, most of the air sent out from the fan unit 32 flows through the air guide 35 and then flows through the inside of the motor unit 31 to be cooled, and then is discharged to the outside.
[0021]
A part of the air is directly discharged from the exhaust hole 37 of the fan casing 36 to the outside. The reason for performing the direct exhaust is to make the exhaust resistance of the fan part 32 as small as possible to improve the fan characteristics.
[0022]
By the way, in the case of exhausting directly from the exhaust hole 37 of the fan casing 36, since the speed of exhaust through the exhaust hole 37 is high, wind noise is inevitably generated. In the present embodiment, since the soundproof cover 38 is provided opposite to the exhaust hole 37, the generated wind noise is blocked by the soundproof cover 38, and leakage to the outside can be suppressed.
[0023]
In the present embodiment, the soundproof cover 38 has a cylindrical shape, but may have a polygonal cylindrical shape, and may have a straight shape or a tapered shape.
(Example 2)
In FIG. 2, the soundproof cover 38 is formed between the fan casing 36 and a gap X that is closed at the top and opened at the bottom, and the lower part of the gap is set to a height that surrounds the outer periphery of the motor unit 31. It is.
[0024]
In the above configuration, wind noise generated in the exhaust hole 37 is blocked by the soundproof cover 38 as described above. The exhaust air in the soundproof cover 38 flows to the bottom of the outer periphery of the motor unit 31 and is then discharged to the outside. Therefore, the motor unit 31 is reliably cooled by the exhaust gas flowing on the outer periphery.
[0025]
Since the carbon brush 33 of the motor unit 31 becomes unstable at high temperatures, the life of the carbon brush 33 becomes unstable due to the occurrence of abnormal sparks and the like.
(Example 3)
3 is characterized in that a gap X is formed between the soundproof cover 38 and the fan casing 36, and the size of the gap X is set to 5 mm ≦ X ≦ 20 mm.
[0026]
In the above configuration, wind noise generated in the exhaust hole 37 is blocked by the soundproof cover 38 as described above. However, if the size of the gap is widened, the soundproofing effect is remarkably reduced, so that the gap is set to 20 mm or less. When the size is reduced, the exhaust air from the exhaust hole 37 of the fan casing 36 immediately hits the soundproof cover 38, so that the wind speed of the exhaust decreases. In relation to the decrease in the wind speed, as shown in FIG. 4, when the size is 5 mm or less, the motor performance is rapidly deteriorated. Therefore, the soundproofing effect can be exhibited without degrading the performance.
Example 4
5 is characterized in that a sound absorbing material 39 is filled in a gap between the soundproof cover 38 and the fan casing 36. An example of the sound absorbing material 39 is a porous member such as urethane foam.
[0027]
In the above configuration, the wind noise generated from the exhaust hole 37 is first absorbed by the sound absorbing material 39 and reduced. Furthermore, since it is further blocked by the soundproof cover 38 after that, a further soundproof effect is produced.
(Example 5)
6 is characterized in that a plurality of holes 41 are provided in the outer peripheral wall of the soundproof cover 38, and the outside of these holes 41 is covered with a sound deadening cover 40 to form a sound deadening chamber 40a therebetween.
[0028]
In the above configuration, wind noise generated from the exhaust hole 37 hits the soundproof cover 38 and is reduced as described above. Part of the noise propagates through the hole 41 to the muffler chamber 40a, where the energy is attenuated.
[0029]
As described above, in this embodiment, the noise reduction is further improved by both the sound insulation and the silencing.
(Example 6)
The characteristic feature in FIG. 7 is that the sound absorbing material 39 is filled in the muffler chamber 40a in the fifth embodiment. An example of the sound absorbing material 39 is a porous member such as urethane foam.
[0030]
In the above configuration, wind noise generated from the exhaust hole 37 hits the soundproof cover 38 and is attenuated as described above. Furthermore, the noise propagated to the sound deadening chamber 40a through the hole 41 can be combined with the sound absorbing action of the sound absorbing material 39 to obtain a higher soundproofing effect.
(Example 7)
8 is characterized in that a plurality of curved guide vanes 42 are provided on the soundproof cover 38 in order to guide the air flowing into the soundproof cover 38 from the exhaust hole 37.
[0031]
In the above configuration, the flow of the exhaust air is made smooth by passing the exhaust air flowing into the soundproof cover 38 from the exhaust hole 37 of the fan casing 36 along the guide vanes 42 provided in the soundproof cover 38. Performance improvement and noise reduction can be achieved.
(Example 8)
9 is characterized in that a sound absorbing material 39 is filled in the gap between the guide blades 42 in the seventh embodiment. An example of the sound absorbing material 39 is a porous member such as urethane foam.
[0032]
In the above-described configuration, the exhaust air flowing into the soundproof cover 38 as described above is allowed to pass along the guide vanes 42 provided on the soundproof cover 38, so that the flow of the exhaust air is smoothed. Furthermore, by absorbing the noise flowing into the soundproof cover 38 with the sound absorbing material 39, it is possible to improve performance and further improve the soundproofing effect.
Example 9
10 is characterized in that the electric blower 51 of the present invention is used in a vacuum cleaner 52 to which a nozzle 53, an extension pipe 54, and a hose 55 are connected.
[0033]
The operation in the above configuration will be described. When the vacuum cleaner 52 is operated, the dust collected by the suction force of the electric blower 51 passes through the extension pipe 54 and the hose 55.
[0034]
By using the electric blower 51 of the present invention for the electric vacuum cleaner 52, high performance is ensured by further reducing the decrease in the exhaust wind speed, and the reliability of the motor unit is improved and the noise is reduced. 52 can be provided.
[0035]
By providing a soundproof cover as in the above embodiment, the noise generated from the fan part can be cut off, and the life of the electric blower can be extended by contributing to the cooling of the motor part. The flow can be smoothed, and the noise can be further reduced by high performance and sound absorption effect.
[0036]
【The invention's effect】
According to the present invention, it is possible to reduce noise generated from an exhaust hole of a conventional fan casing without degrading performance by providing a cylindrical soundproof cover that covers the fan casing.
[Brief description of the drawings]
FIG. 1 is a front view in section of a part of an electric blower showing a first embodiment of the present invention. FIG. 2 is a front view in section of a portion of an electric blower showing a second embodiment of the present invention. FIG. 3 is a front view, partly in section, of an electric blower showing a third embodiment of the present invention. FIG. 4 is a diagram showing a relationship between distance and motor performance. FIG. 5 is a fourth embodiment of the present invention. FIG. 6 is a front view of a part of an electric blower showing a cross section. FIG. 6 is a front view of a part of an electric blower showing a fifth embodiment of the present invention. FIG. 7 is a sixth embodiment of the present invention. FIG. 8 is a sectional view of an electric blower showing a seventh embodiment of the present invention. FIG. 9 is a sectional view of an electric blower showing an eighth embodiment of the present invention. FIG. 10 is a view showing an electric vacuum cleaner using an electric blower in an embodiment of the present invention. FIG. 11 is a half-cut section of an electric blower showing a conventional example. Front view Description of the sign]
DESCRIPTION OF SYMBOLS 31 Motor part 32 Fan part 33 Carbon brush 34 Centrifugal fan 35 Air guide 36 Fan casing 37 Exhaust hole 38 Soundproof cover 39 Sound absorbing material 40 Silent cover 40a Silent room 41 Hole 42 Guide vane 50 Electric blower 51 Electric vacuum cleaner 53 Nozzle 54 Extension pipe 55 hose

Claims (6)

A motor unit; a centrifugal fan driven by the motor unit; an air guide that rectifies air blown from the centrifugal fan and guides the air to the motor unit; and a fan casing that covers the fan unit. An exhaust hole for exhausting a part of the air sent from the centrifugal fan directly to the outside is formed on the outer periphery, and a cylindrical soundproof cover is provided at a distance from the exhaust hole, and the soundproof cover and the fan casing are Electric blower with sound absorbing material filled in the gaps between them. A motor unit; a centrifugal fan driven by the motor unit; an air guide that rectifies air blown from the centrifugal fan and guides the air to the motor unit; and a fan casing that covers the fan unit. An exhaust hole for directly discharging a part of the air sent from the centrifugal fan to the outside is formed on the outer periphery, and a cylindrical soundproof cover is provided at a distance from the exhaust hole, and a plurality of soundproof covers are provided on the outer periphery of the soundproof cover. An electric blower in which a hole is provided and the outside of these holes is covered with a sound deadening cover to form a sound deadening chamber between them. The electric blower according to claim 2 , wherein the sound deadening chamber is filled with a sound absorbing material. A motor unit; a centrifugal fan driven by the motor unit; an air guide that rectifies air blown from the centrifugal fan and guides the air to the motor unit; and a fan casing that covers the fan unit. An exhaust hole for exhausting a part of the air sent from the centrifugal fan directly to the outside is formed on the outer periphery, and a cylindrical soundproof cover is provided at a distance from the exhaust hole, and flows into the soundproof cover from the exhaust hole. electric blower digits plurality set of curved guide vanes in the soundproof cover to guide the air. The electric blower according to claim 4 , wherein a sound absorbing material is filled in a gap between the guide blades. The vacuum cleaner which mounts the electric blower of any one of Claim 1 to 5 for dust-containing air suction.

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