JPH03557Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a blower that uses an external rotor type electric motor and has blowing blades attached to and detached from an outer rotor.

(B) Conventional technology In conventional blowers, an internal rotor type is used as the electric motor, and when the blower blades are removed, the case body housing the stator and the cover body covering the electric motor cover the outside. Inevitably, the structure was designed to prevent foreign matter from entering between the stator and rotor.

On the other hand, in the case of the fan shown in Utility Model Publication No. 43-19010, which uses an external rotor as an electric motor, the open end of the outer rotor is loosely overlapped with the support member of the inner stator. This prevents foreign matter from entering the motor, but the disadvantage is that the blower blades are attached around the outer rotor in such a way that they cannot be easily removed, making it difficult to attach and remove the blower blades, making cleaning difficult. There is. In addition, in the case of the electric fan shown in Japanese Utility Model Publication No. 60-6636, the outer rotor is loosely fitted into the bowl-shaped case support member to which the inner stator is attached, thereby preventing foreign matter from entering the motor. However, the structure is complicated, and the outer rotor must be fitted into a bowl-shaped case support member during assembly, which makes assembly work difficult and difficult to clean.

(c) Problems to be Solved by the Invention The present invention provides a blower having an external rotor motor with a simple structure and preventing foreign matter from entering the motor.

(d) Means for Solving the Problems The blower of the present invention has a boss part of a blower blade attached to a spinner on the rotary shaft of an outer rotor type electric motor consisting of an inner stator and an outer rotor having a rotating shaft. In the blower, which is removably fixed to the outside rotor, a flange is formed on the outer periphery of the open end of the outer rotor, and the flange that covers the flange without contact is used as a support for the inner stator of the motor. It is characterized in that it is formed at the rear guard attachment part of the component that is attached and detached from the body.

The component forming the flange portion may be a nut body for attaching and detaching the rear guard body, or a cover body for covering the support body.

Furthermore, in the above structure, the boss part of the blower blade may be mounted so as to cover the outer rotor, and the open end of the boss part may be arranged so as to cover the flange part.

(E) Function The present invention provides a simple structure for the electric motor, such as forming a flange on the outer rotor, and forms a flange on the rear guard body attachment part of the component that is attached to and removed from the support, thereby improving the structure. This simplifies the process and allows the flanges to naturally overlap each other during assembly.

(f) Example Based on the first example shown in FIGS. 1 to 4, the second example shown in FIGS. 5 and 6, and the third example shown in FIGS. 7 and 8. The present invention will be explained below.

A first example will be described.

FIG. 1 is a cross-sectional view of the main body 3 of the fan 1 supported by the pillar 2, and FIG. 2 is a right side view of the fan 1. FIG. 3 is an exploded perspective view of the part where the rear guard body 5 is attached to the electric motor part 4 of the electric fan main body 3 using the nut body 6, and FIG. 4 shows the cover body 7 and the rear cover body 8 disassembled from the electric motor part 4. It is a perspective view of a state.

The stand 9 that supports the electric fan main body 3 in a vertically movable manner is composed of a base 10 having a switch etc. installed therein and a support 2 protruding from the base 10. The support column 2 is composed of a fixed column that projects integrally with the base 10 and a movable column that supports the fixed column in a vertically movable manner.

The electric fan main body 3 includes a neck piece 11 that is pivotably supported on the tip of the support column 2 so as to be able to move up and down, an electric motor section 4 that is swingably supported on the neck piece 11 by a pivot 12, and a nut body 6 that is attached to and detached from the electric motor section 4. a rear guard body 5, and a blower blade 1 which is detachably attached to the rotating shaft 13 of the electric motor section 4 with a spinner 14.
5, and a front guard body 16 connected to the rear guard body 5.

The electric motor section 4 includes an L-shaped support 17 on which the pivot shaft 12 is vertically disposed, a swinging device 18 formed on the horizontal portion of the support 17, and an external rotor type electric motor 19 formed on the vertical portion of the support 17. , a rear cover body 8 attached to the rear side of the support body 17, and a front cover body 7 attached to the front side of the support body 17. The support body 17 is formed by aluminum die casting.
The swinging device 18 is formed of a swinging motor, a cam body, and a link body. The electric motor 19 uses a DC brushless motor in this embodiment. The electric motor 19 has a cylindrical portion 20 protruding from the support 17.
It consists of an inner stator 21 that is fitted on the outside, and an outer rotor 22 that has a rotating shaft 13 that is rotatably supported by a bearing built into the cylindrical portion 20. Said cylinder part 20
A substrate 23 on which a position detection element for the rotor 22 is mounted is mounted on the outer side of the base end. The rotor 22 includes a rotating shaft 13, a steel plate case body 23 which also serves as a yoke and is press-fitted into a knurled portion formed on the protruding portion of the rotating shaft 13 from the stator 21, and an inner surface of the case body 23. It consists of a permanent magnet 24 that is press-fitted and fixed to the magnet. The open end of the case body 23 is bent to form a flange 25 that extends outward.

The blower blade 15 is composed of a cup-shaped boss portion 26 and a wing piece 27 extending outside the boss portion 26 .
A locking portion 29 is formed at the center of the inner surface of the boss portion 26 to engage with a detent pin 28 formed on the rotating shaft 13. The detent pin 28 is formed close to the base of the rotary shaft 13 that protrudes from the case body 23 . By bringing the detent pin 28 close to the case body 23, the boss portion 26 is able to overlap the rotor 22 to a large extent. By screwing the spinner 14 onto the rotating shaft 13, the blower blade 15 is fixed to the rotating shaft 13. Therefore, even if the spinner 14 is screwed in strongly,
By being received by the detent pin 28, the force does not act on the case body 23, and the positions of the rotor 22 and stator 21 can be ensured with high accuracy.

The rear cover body 8 is fixed to the rear end and upper end of the support body 17 with screws 30. Said support 1
The vertical portion 7 projects outward from the rotor 22 . The front cover body 7 is attached to the projecting portion.
are fixed with screws 31. The front cover body 7 has an opening 32 through which the electric motor 19 is inserted. A cylindrical portion 33 is formed at the edge of the opening 32 to cover the open end of the rotor 22 in a non-contact manner.
A thread is cut on the outer surface of the cylindrical portion 33, and the nut body 6 is screwed into it. The rear guard body 5 includes a central attachment ring body 34, an outer ring 35, and a wire rod 36 installed between the attachment ring body 34 and the outer ring 35. The attachment ring body 34 is fitted into the cylinder portion 33 and detachably attached to the front cover body 7 using the nut body 6. Positioning and rotation prevention between the mounting ring body 34 and the front cover body 7 are achieved by attaching a protrusion 37 protruding from the front cover body 7 to the mounting ring body 34.
This is done by engaging the insertion hole 38 of. Also, the screw 3
1 may be used to prevent the mounting ring body 34 from rotating. The cylindrical portion 33 and the attachment ring body 34 serve as attachment parts for the rear guard body 5. A flange portion 39 is provided inside the end of the cylindrical portion 33 . The inner edge of the flange portion 39 is located close to the case body 23 and also close to the flange portion 25. Therefore, by overlapping the flange portion 39 and the flange portion 25, the open end portion of the rotor 22 can be hidden while ensuring ventilation. the result,
A cooling passage for the electric motor 19 is secured, foreign matter is prevented from entering, and dust is also prevented from entering. Furthermore, in this embodiment, by making the end of the boss portion 26 of the blower blade 15 close to the flange portion 39, it is possible to better prevent dirt and the like from entering the electric motor 19 during operation.

A second example will be explained.

In this embodiment, the flange portion 39 formed on the cylindrical portion 33 of the front cover body 7 in the first embodiment is formed on the nut body 6.

A third embodiment will be explained.

In this embodiment, the rear guard body 5 and the front cover body 7 are integrally formed of synthetic resin, and the nut body 6 which was necessary in each of the above-mentioned embodiments is eliminated, thereby reducing the number of parts. be.

In addition, a ring body 40 is used as a member for positioning and preventing rotation of the blower blade 15 formed on the rotating shaft 13.
It was formed in As a result, the locking pin 2 is attached to the rotating shaft 13, which was done in the previous embodiment.
This eliminates the press-fitting work in step 8 and simplifies manufacturing. An E-ring or the like is used as the ring body 40. Further, by using a ring body 40 having elasticity similar to that of a leaf spring, it is possible to absorb vibrations and the like during rotation of the blower blades 15.

As described above, the present invention has a flange 25 on the outer rotor 22.
To make the assembly process difficult even with a simple structure in which a flanged part 39 is formed on a component that is attached to and detached from the support body 17, such as the so-called nut body 6, front cover body 7, rear guard body 5, etc. Therefore, it is possible to prevent foreign matter from entering the electric motor 19. Also, a cover to which the outer rotor 22 of the outer rotor type electric motor 19 is fixed (see Japanese Utility Model Publication No. 53-4412)
The cooling effect is improved by not being covered with

Further, in order to improve the cooling effect of the electric motor 19 and to prevent direct intrusion of foreign matter (dust), an opening is formed in the front surface of the boss portion 26 of the blower blade 15,
The reinforcing ribs 41 formed on the front surface of the boss portion 26 are made into wing pieces by inclining or twisting the reinforcing ribs 41 formed on the front surface of the boss portion 26.
It is formed to send the air inside to the front. At this time, a ventilation hole is formed in the spinner 14. By forming as described above, air flows between the boss portion 26 and the rotor 22, and the open end of the boss portion 26 and the flanged portion 39
Air flows in from between the two, improving the cooling effect of the electric motor 19. Furthermore, air flows in between the boss portion 26 and the flanged portion 39, forming an air curtain between the flanged portion 39 and the rotor 22, thereby preventing the intrusion of foreign substances such as dust. be done.

(g) Effects of the invention This invention simplifies the structure and prevents foreign matter from entering the motor by forming the flange part on the outer rotor and the flange part on the rear guard body attachment part of the component. ,
The cooling effect can also be improved.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, in which FIG. 1 is a sectional view of the main part, FIG. 2 is a right side view, and FIG. 3 is a perspective view of the rear guard body in an exploded state. Fourth
The figure is an exploded perspective view of the electric motor section, FIG. 5 is a sectional view of the main part of the second embodiment, FIG. 6 is an exploded perspective view of the main part, and
The figure is a sectional view of a main part of the third embodiment, and FIG. 8 is a partial perspective view of the same blowing blade in an exploded state. 4... Electric motor section, 5... Rear guard body, 6... Nut body (constituent member), 7... Front cover body (constituent member), 17... Support body, 19... Electric motor, 22...
...outer rotor, 25...flange, 39...flange covered part.

Claims (1)

[Claims for Utility Model Registration] 1. A blower in which a boss portion of a blower blade is removably fixed to the rotating shaft of an external rotor motor consisting of an inner stator and an outer rotor having a rotating shaft using a spinner. A flange is formed on the outer periphery of the open end of the outer rotor, and the flange covering the flange in a non-contact manner is attached to and removed from the support of the inner stator of the electric motor. A blower formed in the part where the guard body is attached. 2. The blower according to claim 1, wherein the component forming the flange portion is a nut body for attaching and detaching the rear guard body. 3 Utility model registration claim 1 in which the component forming the flange part is a cover body that covers the support body
Blower as described in section. 4. The blower according to claims 1 to 3, wherein the boss part of the blower blade is mounted over the outer rotor, and the open end of the boss part is arranged so as to cover the flange part.