JPH10141289A - Electric blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of components and improve productivity by projecting an extending member formed with a side surface wall constituting material on a circumferential rim of a side surface hole of a casing toward an impeller side of a casing inside, and forming an air guide for leading air delivered from the impeller into a casing outside. SOLUTION: A suction port 10 is arranged on the center of a casing 9, and also a center opening part of an impeller 8 is arranged opposing to the suction port 10. A plurality of side surface holes 11 are arranged on a side surface wall of the casing, and air guides 12 formed by folding a constituting member of the casing 9 to the impeller 8 side, are formed on a circumferential rim of the side surface holes 11. The air guides 12 are arranged upper and lower sides of the circumferential rim of the side surface holes 11 in order to guide flow delivered from an outer periphery of the impeller 8 in the vertical direction so as to improve air sending efficiency. Since the air guide 12 is formed with the constituting member of the casing 9, the air guide as independent parts is eliminated. It is thus possible to reduce the number of components.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower used for a hand drying device for drying hands against the wind.

[0002]

2. Description of the Related Art Conventionally, various electric blowers have been used in such a device, and among them, a typical example is an electric blower having a configuration as shown in FIG. As shown in the figure, an impeller 2, an air guide 3 for guiding a discharge flow from the outer periphery of the impeller 2, and the like are arranged in a casing 1, and a lower opening side of the casing 1 is an electric motor (hereinafter, referred to as a motor).
4 attached to the motor frame 5. The side wall of the casing 1 is provided with a plurality of side holes 6 over the entire circumference.

Further, one end of the drive shaft 4a of the motor 4 is connected to the impeller 2, and the other end of the drive shaft 4a is connected to the cooling propeller 7. This is because it is more efficient to send the cooling air directly into the motor 4 by the cooling propeller 7 than to pass the discharge flow from the blower impeller 2 into the motor 4. That is, the electric blower used for the hand dryer and the like is designed with the impeller 2 and the like so as to generate a large air volume.
When it is pushed into the inside, the pressure loss that increases in proportion to the square of the air volume increases and the air blowing efficiency decreases, so the cooling propeller dedicated to cooling without using the large air volume generated by the impeller 2 7 to cool the motor 4 was more efficient.

In this configuration, the impeller 2 is a motor 4
, The airflow is generated at a high speed, and the airflow is discharged from the side hole 6 of the casing 1 to generate a wind that contributes to drying. Since the cooling propeller 7 also rotates at the same time as the rotation of the impeller 2, the motor 4
Was cooled by the wind generated in the above to prevent excessive heating.

[0005]

In the conventional electric blower described above, the discharge flow from the impeller 2 can be efficiently transmitted to the side holes 6.
The air guide 3 is required to guide the motor, and a cooling propeller for cooling the motor 4 is required separately from the impeller 2, resulting in an increase in cost due to an increase in the number of parts and an increase in the number of assembly steps. The increase caused a decrease in productivity.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a highly productive electric blower with a reduced number of parts.

[0007]

In order to achieve the above object, according to the present invention, a side wall is provided in a side wall of a casing, and a peripheral wall of the side hole is formed on a peripheral edge of the side wall toward an impeller inside the casing. Since the extension member made of a material is projected and used as an air guide for guiding the discharge air from the impeller to the outside of the casing, the member of the air guide can be formed by the side wall, so that no separate air guide part is required,
The number of parts can be reduced.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION
An electric motor for rotating the impeller, and a casing that covers the impeller, a plurality of side holes are provided in a side wall of the casing, and a side surface of the side hole toward the impeller side inside the casing is provided on a peripheral edge of the side hole. An extension member made of a wall component protrudes to serve as an air guide for guiding the discharge air from the impeller to the outside of the casing. With this configuration, an air guide component separate from the casing is not required, so that the components are not required. Points can be reduced.

According to a second aspect of the present invention, there is provided an electric motor for rotating an impeller, an air guide arranged so as to partition the impeller and the electric motor, and for guiding a discharge flow from the impeller. A casing that covers the air guide; a side wall of the casing is provided with a side hole communicating between the impeller inside the casing and the outside of the casing; and a discharge flow of the impeller is guided to the outside following the air guide. An outlet, and further, a gap is provided between the outer peripheral end of the air guide and the casing side wall, which communicates with the inside of the motor. With this configuration, the outer peripheral end of the air guide is formed by the discharge flow of the impeller. The air in the gap between the casing and the side wall is sucked, and the air flows through the gap leading to the inside of the motor to cool the inside of the motor. Dedicated cooling propeller is not required,
The number of parts can be reduced.

The third aspect of the present invention is the second aspect of the present invention.
In the described invention, the height at the edge of the side hole of the casing is higher than the height at the outer peripheral end of the air guide in a direction that blocks the main flow of the discharge flow from the impeller. A part of the discharge flow from the nozzle flows into the gap and is supplied as cooling air into the motor, so that a cooling propeller for cooling the motor is not required.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 shows a first embodiment of the present invention.
It will be described based on. In the figure, reference numeral 8 denotes an impeller, which is covered by a casing. A suction port 10 is provided at the center of the casing 9, and a central opening of the impeller 8 is provided so as to face the suction port 10. 11
Are side holes provided on the side wall of the casing 9. An air guide 12 formed by bending a component of the casing 9 toward the impeller 8 is formed at a peripheral edge of the side hole 11. The air guides 12 are provided on the upper side and the lower side of the peripheral edge of the side hole 11, respectively, and are configured to be able to guide the discharge flow from the outer periphery of the impeller 8 in the up-down direction and to increase the blowing efficiency. In addition, if this air guide 12 is provided at least on the lower side, it can exhibit a blowing efficiency close to the electric blower shown in the prior art.

Reference numeral 13 denotes a pillar portion which is a boundary of the side hole 11.
The lower opening side of the casing 9 is the frame 15 of the motor 14.
Attached to. A cooling propeller 16 is connected to one end of a drive shaft 14a of the motor 14, and an impeller 8 is connected to the other end.

The operation of this embodiment will be described below.
By the rotation of the motor 14, the impeller 8 rotates to generate wind, and passes through the inside of the impeller 8 from the suction port 10 of the casing 9, and an airflow 17 indicated by a solid arrow toward the side hole 11 of the casing 9 is generated. Will occur. At this time, the air flow 17 reaches the side hole 11 through the air guide 12 provided in the casing 9, so that the flow is smooth. The wind generated by the rotation of the cooling propeller 16 flows as indicated by a dotted arrow 18, and the wind prevents the motor 14 from being overheated.

As described above, in this embodiment, the air guide 12
Is formed by the constituent members of the casing 9, so that the air guide 12 as a separate component as in the related art is not required, and the number of components can be reduced.

(Embodiment 2) Next, a second embodiment of the present invention will be described with reference to FIG. In the figure, 19 is an impeller, which is covered by a casing 20. Casing 2
0 has a suction port 21 at the center, and is configured to suck air from the center opening of the impeller 19. Reference numeral 22 denotes a plurality of side holes provided on the side wall of the casing 20. Reference numeral 23 denotes a pillar portion serving as a boundary of the side hole 22. Inside the casing 20, the impeller 1 is provided.
In addition to 9, an air guide 24 is mainly provided.

The air guide 24 is provided with an annular inclined surface on its outer peripheral side, and the discharge flow from the outer periphery of the impeller 19 is
Guided to 2. An annular gap 27 is provided near the outer periphery of the air guide 24 between the air guide 24 and the frame 26 of the motor 25. The annular gap 27 communicates with the inside of the motor 25. Reference numeral 28 denotes a ventilation hole provided in the motor 25.
The casing 20 is attached to a frame 26 of a motor 25.

The operation of this embodiment will be described below.
By the rotation of the motor 25, the impeller 19 rotates to generate wind, and passes through the inside of the impeller 19 from the suction port 21 of the casing 20, and the airflow 29 indicated by a solid arrow toward the side hole 22 of the casing 20 is generated. Will occur.
At this time, since the airflow 29 passes above the annular gap 29 provided between the air guide 24 and the frame 26 of the motor 25, the airflow 29 is sucked from the ventilation hole 28 through the gap 29 by the ejector effect, and is indicated by a dotted line. The indicated airflow 30 results. When the airflow 30 passes through the inside of the motor 25, the motor 25 is cooled. As described above, the large air volume generated by the impeller 19 is
Since it is not configured to send air into the inside, it is possible to prevent an increase in pressure loss due to sending air from the impeller into the motor 25, and to reduce the blowing efficiency only by the blowing loss generated at the time of the ejector effect. The degree of loss is smaller than the loss required to rotate the cooling propeller separately, and an efficient electric blower can be realized.

As described above, according to the present embodiment, the motor 25 can be cooled without using a conventional cooling propeller, so that the load on the motor can be reduced. Further, since a component called a cooling propeller is not required, the number of components can be reduced.

(Embodiment 3) A third embodiment of the present invention will be described with reference to FIG. In the figure, reference numeral 31 denotes an impeller, which is covered by a casing 32. Casing 3
A suction port 33 is provided at a central portion of 2 so that air can be sucked from a central opening of the impeller 31. 3
Reference numeral 4 denotes a plurality of side holes provided on the side wall of the casing 32. Reference numeral 35 denotes a pillar portion which is a boundary of the side hole 34.
An air guide 36 is provided inside the casing 32 in addition to the impeller 31.

Near the outer periphery of the air guide 36, an annular gap 39 is provided between the air guide 36 and a frame 38 of the motor 37. This annular gap 3
Reference numeral 9 denotes a passage leading to the inside of the motor 37. The height H1 of the outer peripheral end 40 of the air guide 36 and the height of the casing 3
Comparing the height H2 of the air guide side end surface 41 of the second side hole 34, the air guide side end surface 41 of the side hole 34 of the casing 32 is set to be higher. Reference numeral 42 denotes a ventilation hole provided in the motor 37. The casing 32 is configured to be attached to the frame 38 of the motor 37.

Hereinafter, the operation of this embodiment will be described.
By the rotation of the motor 37, the impeller 31 rotates to generate wind, and passes through the inside of the impeller 31 from the suction port 33 of the casing 32, and the airflow 43 indicated by a solid arrow toward the side hole 34 of the casing 32 is formed. Will occur.
At this time, since the airflow 43 flows along the air guide 36, when reaching the end point 40, a part of the airflow collides with the end face 41 of the side hole 34 located at a position higher than the end point 40, and the airflow 43 branches off. Is divided into airflows 44 indicated by. The airflow 44 passes through the inside of the motor 37, passes through the air holes 42, and flows out to the outside while cooling the motor 37. The airflow passing through the inside of the motor 37 is a part of the large airflow generated by the impeller 31, so that the airflow can be extremely small as compared with the case where the large airflow from the impeller 31 flows through the inside of the motor 37 as it is. The increasing pressure loss is small and this loss is small compared to the loss for rotating the cooling propeller fan.

As described above, in this embodiment, since a cooling propeller is required, the load on the motor can be reduced and the number of parts can be reduced.

[0024]

As is apparent from the above embodiment, according to the first aspect of the present invention, a guide protruding toward the impeller by a casing member is formed on the periphery of the side hole provided in the casing. Since the casing and the air guide can also be used, the cost can be reduced and the productivity can be improved by reducing the number of parts.

Also, by providing a gap communicating with the inside of the motor between the side wall of the casing and the outer peripheral end of the air guide as in the second aspect of the present invention, the inside of the motor is formed by the ejector effect due to the discharge flow from the impeller. In addition to the above, it is possible to reduce the load on the motor by eliminating the need for a cooling propeller and improve the productivity by reducing the number of parts.

Further, as in the third aspect of the present invention, a gap is provided between the side wall of the casing and the outer peripheral end of the air guide, and a part of the discharge flow from the impeller is formed in the casing. By blocking with the wall of the side hole end face,
A part of the discharge flow from the impeller can be cooled by flowing into the motor, so that a cooling propeller is not required, thereby reducing the motor load and improving the productivity.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of an electric blower showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway side view of an electric blower showing a second embodiment of the present invention.

FIG. 3 is a partially cutaway side view of an electric blower showing a third embodiment of the present invention.

FIG. 4 is a partially cutaway side view showing a conventional electric blower.

[Explanation of symbols]

 8 Impeller 9 Casing 11 Side hole 12 Air guide 20 Casing 22 Side hole 24 Air guide 27 Gap 31 Impeller 32 Casing 34 Side hole 36 Air guide 39 Gap

Claims (3)

[Claims] An electric motor for rotating an impeller;
A casing that covers the impeller is provided, and a plurality of side holes are provided in a side wall of the casing, and an extension member made of a side wall component is protruded from a peripheral edge of the side hole toward the impeller inside the casing. And an electric blower serving as an air guide for guiding the air discharged from the impeller to the outside of the casing. 2. An electric motor for rotating an impeller,
An air guide that guides a discharge flow from the impeller, and a casing that covers the impeller and the air guide; a side wall of the casing; A side hole communicating with the outside is provided, an outlet for guiding the discharge flow of the impeller to the outside following the air guide, and further, between the outer peripheral end of the air guide and the side wall of the casing, An electric blower with a gap leading to the inside of the motor. 3. The height at the side edge of the side hole of the casing is higher than the height at the outer peripheral end of the air guide in a direction that blocks the main flow of the discharge flow from the impeller. The described electric blower.