JP3777765B2 - 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 having an air guide that rectifies wind blown from an impeller, and a vacuum cleaner using the same.
[0002]
[Prior art]
A configuration of a commutator electric blower which is a kind of a conventional electric blower will be described with reference to FIG. The commutator electric blower 19 includes a motor unit 32 and a fan unit 31 that is rotationally driven by the motor unit 32. Hereinafter, configurations of the motor unit 32 and the fan unit 31 will be described.
[0003]
The motor unit 32 supports the armature 1, the armature 1 having the commutator 2, the rotating shaft 3 that is rotated by the armature 1, the bearing 4 that supports both ends of the rotating shaft 3, and the bearing 4. The load side bracket 5 and the anti-load side bracket 6, the carbon brush 8 for supplying electric power to the commutator 2, and the metal brush holder 7 that incorporates the carbon brush 8 and is held by the anti-load side bracket 6. And a field core 9 that applies a rotating magnetic field to the armature 1.
[0004]
The fan unit 31 includes an impeller 11 fixed to the rotary shaft 3, an air guide 10 that rectifies the wind blown from the outer periphery of the impeller 11, and changes the flow of the wind toward the load side bracket 5, the impeller 11, The casing 12 is configured to cover an upper portion of the air guide 10 and an intake pipe 16 that forms an intake port of the casing 12.
[0005]
The impeller 11 is fixed to the rotary shaft 3 by a spacer 13, a washer 14 and a nut 15, and rotates together with the rotary shaft 3. The air guide 10 is fixed to the load side bracket 5 with screws (not shown) or the like, and the load side bracket 5 and the anti-load side bracket 6 are also fixed with screws (not shown) or the like. The intake pipe 16 is fixed to the casing 12 by welding or the like.
[0006]
[Problems to be solved by the invention]
In the conventional commutator electric blower, since the blown air that has passed through the guide vanes of the casing 12, the impeller 11, and the air guide 10 flows to the motor unit 32 as cooling air for cooling the motor unit 32, from the surface of the air guide 12. In order to change the flow of the wind toward the back side, the ventilation area between the outlet of the back surface of the air guide 12 and the entrance of the motor unit 32 is drastically reduced. Therefore, a ventilation loss occurs, and the suction by the fan unit 31 occurs. It was a factor of power reduction.
[0007]
This invention solves the said subject, and it aims at providing the electric blower which improved the suction power in a fan part, and a vacuum cleaner using the same.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a motor unit, an impeller that is rotationally driven by the motor unit and provided with an air outlet for air blowing on the outer periphery, and discharges air blown from the outlet in the outer peripheral direction. An air guide provided with guide vanes and a casing that covers the top of the impeller and the air guide are provided, and the guide vanes are disposed on the outer periphery of the blowout port, and the blown air is discharged as exhaust along the outer circumferential direction. With the configuration, the casing is divided into a portion covering the impeller and a portion covering the guide vane, and the air guide is also separated into an outer peripheral portion and other than the blowout port of the impeller provided with the guide vane , Each of the separated and divided casings and air guides can be moved in the axial direction of the motor part. According to the configuration, since the blown air that has passed through the casing, impeller, and air guide guide vanes is rectified and flows in the direction of the outer periphery of the air guide as it is, the fan section reduces airflow loss and improves the air guide rectifying action. You can increase the suction power in
[0009]
In addition, by guiding the outer peripheral parts of the separated and divided casing and air guide in the axial direction of the motor unit so that the air blown from the impeller does not directly hit the guide vanes of the air guide, Wind noise generated by the blades can be reduced.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, a motor unit, an impeller that is rotationally driven by the motor unit and has a blowout port for air blowout on the outer periphery, and blowout air from the blowout port are discharged in the outer peripheral direction. An air guide provided with guide vanes and a casing that covers the top of the impeller and the air guide are provided, and the guide vanes are disposed on the outer periphery of the blowout port, and the blown air is discharged as exhaust along the outer circumferential direction. With the configuration, the casing is divided into a portion covering the impeller and a portion covering the guide vane, and the air guide is also separated into an outer peripheral portion and other than the blowout port of the impeller provided with the guide vane , The outer peripheral parts of the separated and divided casing and air guide are movable in the axial direction of the motor part. According to the above, since the blown air that has passed through the guide vanes of the casing, impeller, and air guide is rectified and flows as it is in the outer peripheral direction of the air guide, it reduces airflow loss and improves the air guide rectifying action. The suction power can be increased.
[0011]
In addition, by guiding the outer peripheral parts of the separated and divided casing and air guide in the axial direction of the motor unit so that the air blown from the impeller does not directly hit the guide vanes of the air guide, Wind noise generated by the blades can be reduced.
[0012]
According to a second aspect of the present invention, a dust collecting chamber and an electric blower chamber are provided in the vacuum cleaner body, the electric blower according to the first aspect is arranged in the electric blower chamber, and the blower of the impeller of the electric blower is provided. The vacuum cleaner is provided with an exhaust port in the main body of the vacuum cleaner corresponding to the guide vanes when arranged on the outer periphery of the mouth. With this configuration, the exhaust from the electric blower is smoothly flowed from the exhaust port of the cleaner body, the ventilation resistance is suppressed as much as possible, and the suction performance of the electric blower is improved. In particular, an electric blower to which a cooling fan is attached can be divided into two types: exhaust from the impeller and exhaust by the cooling fan, and the state of dust rising due to the exhaust can be suppressed.
[0013]
【Example】
( Reference Example 1)
Hereinafter, a first reference example of the present invention will be described with reference to FIGS. In addition, about the same part as a prior art example, the same code | symbol is attached | subjected and description is abbreviate | omitted.
[0014]
Although the motor unit 32 is almost the same as the conventional configuration, the rotating shaft 3 protrudes on the side of the motor unit 32 where the brush holder 7 is provided, that is, on the side opposite to the impeller 11, and the rotating shaft 3 is cooled. The fan 20 is fixed. Further, an opening 41 for taking in cooling air is provided on the side surface of the anti-load side bracket 6 constituting the outer portion of the motor portion 32, and when the cooling fan 20 is driven to rotate, the cooling air is taken in as indicated by an arrow C. After the inside of the section 32 is cooled, exhaust is performed as indicated by an arrow D.
[0015]
The fully open type air guide 21 of the fan unit 31 is configured such that the guide vanes 30 are arranged toward the outer peripheral blowing direction of the impeller 11 and the blowing air is not folded back to the motor unit 32 side. That is, when the impeller 11 is rotationally driven, air is sucked as indicated by an arrow A, and exhausted from the outer periphery of the impeller 11 along the guide vanes 30 of the air guide 21, that is, as indicated by an arrow B. Also, a welding rib 22 is provided on the top surface of the guide vane 30 and is fixed to the casing 23 covering the upper part of the impeller 11 and the air guide 21 by welding, and the blowing air that has passed through the fully open air guide 21 is It is set to be fully open in the outer peripheral direction along the outlet of the fully open type air guide 21 so as to be blown out in the outer peripheral direction of the fully open type casing 23. The commutator electric blower 19 is configured with such a structure.
[0016]
In addition, when the commutator electric blower 19 is incorporated in the vacuum cleaner main body 24, as shown in FIGS. 2 and 3, the vacuum cleaner main body 24 is made to correspond to the outlet of the fully open air guide 21. An exhaust port 43 is provided on the upper surface and the side surface, and an exhaust filter 25 is provided so as to cover the exhaust port 43, and a motor is provided at the rear portion of the vacuum cleaner body 24 so as to correspond to the exhaust of cooling air from the cooling fan 20. A part exhaust port 44 is provided, and the motor part exhaust port is covered with a motor part exhaust filter 26. A pair of moving rollers 42 are arranged on both sides of the vacuum cleaner main body 24, and a dust collection chamber 45 in which a dust collection filter for collecting dust is installed is arranged in front of the main body 24. An electric blower chamber 46 that houses the commutator electric blower 19 is provided behind the chamber 45, and dust is collected in the dust collection filter in the front dust collection chamber 19 by the suction force of the commutator electric blower 19. .
[0017]
The operation of the above configuration is as follows. That is, the blown air that has passed through the fully open casing 23 and the impeller 11 passes through the guide vanes 30 of the fully open air guide 21 and is smoothly discharged as exhaust along the outer circumferential direction. The motor unit 32 is cooled by the cooling fan 20 provided on the brush holder 7 side, and each component in the motor unit 32 can be cooled.
[0018]
As described above, since the blowing air that has passed through the guide vanes 30 of the air guide 21 as in the prior art does not enter the motor unit 32 as cooling air, it is all discharged in the outer circumferential direction, so that the guide vanes 30 of the air guide 21 are discharged. Ventilation loss when the blown air that has passed through the air enters the motor unit 32 as cooling air can be eliminated. That is, the suction force of the fan part 31 can be increased.
[0019]
In addition, when the commutator electric blower 19 is incorporated in the vacuum cleaner main body 24, the fan exhaust filter 25 is provided on the upper surface and the side of the main body which corresponds to the exhaust portion of the fully open air guide 21, and the exhaust portion of the cooling fan 20. The motor part exhaust filter 26 is provided on the rear side of the main body, and the exhaust part containing the worn carbon powder is exhausted through the motor part exhaust filter 26 on the rear side of the main body by dividing the filter into two parts. Since the exhaust gas that has passed through the fan is exhausted through the fan part exhaust filter 25 provided on the upper and side surfaces of the main body, the person using the vacuum cleaner main body 24 contains carbon powder that has passed only the fan part 31. Only the cleaner exhaust is exhaled. Further, since the exhaust is divided into two parts, the momentum of the exhaust discharged from the rear of the main body is weak, and the dust on the floor, carpet, etc., and the raising of dust can be reduced.
[0020]
(Example 1 )
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In addition, about the same part as the said reference example , the same code | symbol is attached | subjected and description is abbreviate | omitted.
[0021]
The fully open type air guide 21 and the fully open type casing 23 in the outer peripheral portion are separated from the outlet 11a of the impeller 11, and the separated fully open type air guide 21 and the fully open type casing 23 are connected to the rotary shaft 3. When turned in the direction E, the screw-type moving recess 34 of the outer peripheral moving part bracket 35 that fixes the lower part of the air guide 21 extends in the F direction along the screw-type moving groove 33 provided on the anti-load side bracket 6. Moving. That is, by rotating the outer peripheral separation fan portion 47 including the fully open type air guide 21, the fully open type casing 23, and the outer peripheral moving part bracket 35 in the outer peripheral portion in the E direction, the outer peripheral portion is fully opened in the screw principle. The air guide 21, the fully open casing 23, and the outer periphery moving part bracket 35, to which the lower part of the air guide 21 is fixed, are moved to the anti-load side. The commutator electric blower 19 is configured with such a structure.
[0022]
The operation of the above configuration is as follows. That is, as can be seen from FIG. 4, the separated outer peripheral separation fan portion 47 rotates on the rotating shaft 3 in the E direction on the basis of the screw principle. The separation fan portion 47 is configured to move. That is, in a normal state, the blown air discharged from the impeller 11 as shown in FIG. 5 passes through the guide blades 30 of the separated fully open type air guide 21 and is exhausted to the outside. Next, in order to reduce the wind noise generated by the guide vanes 30 of the fully open type air guide 21 even if the suction force of the fan is slightly reduced, the outer peripheral separation fan portion 47 is rotated on the rotating shaft as shown in FIG. 3, the guide blade 30 of the fully open type air guide 21 does not exist at the outlet of the impeller 11, so that there is no wind noise, and the outer peripheral separation fan portion By freely moving 47 in the thrust direction, wind noise can be greatly reduced.
[0023]
( Reference Example 2 )
Hereinafter, a second reference example of the present invention will be described with reference to FIGS. In addition, about the same part as the said Example 1 and the reference example 1 , the same code | symbol is attached | subjected and description is abbreviate | omitted.
[0024]
The fully open type air guide 21 and the fully open type casing 23 are divided in the vicinity of the middle between the inlet 36 and the outlet 37 of the fully open type air guide 21 toward the outer peripheral direction, and the divided fully open type air on the outer peripheral side is divided. The guide 21a and the fully open type fan case 23a are configured such that the split movement groove 38 is movable to the left and right along the outer peripheral movement rail 39 provided on the anti-load side bracket 6. The fully open air guide 21b and the fully open fan case 23b on the inner peripheral side are fixed. The commutator electric blower 19 is configured with such a structure.
[0025]
The operation of the above configuration is as follows. As can be seen from FIG. 7, the outer peripheral side of the fan portion divided at the central portion of the guide vane 30 is configured to be rotatable left and right around the rotation shaft 3 of the motor unit. That is, the guide blade 30 of the fully open type air guide 21a on the left and right movement side is positioned between the normal state of FIG. 8 and the volute chamber 40 of the separated fixed side fully open type air guide 21b. In FIG. 9, the number of guide blades 30 of the fully open air guide 21 is doubled. Therefore, when the wind noise generated from the guide vanes 30 in the normal state of FIG. 8 is anxious, the left and right moving side between the volute chambers 40 of the fixed-side fully open type air guide 21b separated as shown in FIG. By moving so that the guide blade 30 of the fully open type air guide 21a is located, the frequency of the wind noise is doubled and converted to a frequency that is difficult for humans to hear. Can be reduced.
[0026]
【The invention's effect】
As described above, according to the present invention, the guide vanes of the air guide are disposed on the outer periphery of the air outlet, and the air blow is discharged as exhaust along the outer peripheral direction so that the air guide passes through the guide vanes. It is possible to eliminate the loss of ventilation when the blown air blown into the motor unit as the cooling air of the motor unit, and to increase the suction force of the fan unit.
[0027]
In addition, guide the air guide by moving the outer periphery of the separated and divided casing and air guide in the axial direction of the motor section so that the blown air from the impeller does not directly hit the guide vanes of the air guide. Wind noise generated by the blades can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part of a commutator electric blower showing a first reference example of the present invention. FIG. 2 is a partial cross-sectional view of a vacuum cleaner incorporating the commutator electric blower. FIG. 4 is an external perspective view of the commutator electric blower showing the first embodiment of the present invention. FIG. 5 is a cross-sectional view of the main part of the commutator electric blower in a normal state. FIG. 6 is a cross-sectional view of main parts of the commutator electric blower when wind noise is reduced. FIG. 7 is a cross-sectional view of main parts of the commutator electric blower showing a second reference example of the invention. Fig. 9 is a sectional view of the main part of the conventional commutator electric blower when the wind noise is reduced. Fig. 10 is a partially broken side view of the conventional commutator electric blower.
DESCRIPTION OF SYMBOLS 11 Impeller 20 Cooling fan 21 Air guide 21a Moving side air guide 21b Fixed side air guide 23 Casing 23a Moving side casing 23b Fixed side casing 24 Electric vacuum cleaner body 25 Fan unit exhaust filter 30 Guide vane 31 Fan unit 32 Motor part 33 Screw type moving groove 34 Screw type moving recess 35 Outer peripheral moving part bracket 38 Divided moving groove 39 Outer peripheral moving rail 40 Volute chamber

Claims (2)

A motor unit, an impeller that is rotationally driven by the motor unit and provided with an air outlet for air blowing on the outer periphery, an air guide provided with guide vanes for discharging the air blown from the air outlet toward the outer periphery, and the impeller And a casing that covers an upper portion of the air guide, and the guide vanes are arranged on the outer periphery of the outlet, and the outlet air is discharged as exhaust along the outer peripheral direction, and the casing covers the impeller, The air guide is divided into portions covering the guide blades, and the air guide is separated from the blowout port of the impeller provided with the guide blades into an outer peripheral portion and the other, and the separated and divided casing and air guide are respectively An electric blower whose outer peripheral part is movable in the axial direction of the motor part.   A dust collection chamber and an electric blower chamber are provided in the main body of the vacuum cleaner. A vacuum cleaner with an exhaust port in the main body of the vacuum cleaner.

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