JPH0767283A - Drip-proof vertical motor - Google Patents

Abstract

PURPOSE:To shorten the overall length of a motor by providing annular eaves on the outer periphery of a bracket at the upper end of a vertical motor while projecting at least a predetermined length from the outer diameter of the motor thereby eliminating a drip-proof cover and accessories thereof. CONSTITUTION:Annular eaves 17 projecting from the outer frame 28 of a motor is provided on the outer periphery of a bracket 15 at the upper end of the motor in place of a drip-proof cover. A suction port 44 is provided at the lower part of the eaves 17. The eaves 17 prevent foreign matters, e.g. water droplets, from entering into the suction port 44 and a discharge port 34. The eaves 17 are projected at least a predetermined length from the outer frame 28 of motor so that even a water droplet falling at an angle of 15 deg. or less with respect to a vertical line does not enter into the discharge port 34. This structure allows shortening of the overall length of motor while preventing intrusion of foreign matters, e.g. water droplets or dust particles, from above.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical shaft having a jacket structure suitable for preventing foreign matters such as water drops and dust from entering from the upper portion and reducing noise such as wind noise caused by cooling air. The present invention relates to a drip-proof type electric motor.

[0002]

2. Description of the Related Art Conventionally, for example, a structure shown in FIG. 3 is known as a jacket structure of a vertical shaft drip-proof type electric motor of this type. Here, FIG. 3 (A) is a view of the conventional vertical shaft drip-proof protection type electric motor as seen from above, and FIG.
FIG. 3 is an elevation view of a partial cross section thereof. In FIGS. 3A and 3B, reference numeral 10 indicates a drip-proof cover, and the drip-proof cover 10 is attached to the drip-proof cover via a drip-proof cover mounting seat 16 provided on an upper portion of the upper end bracket 14. It is fixed at four points by bolts 12. Vertical shaft motor shaft 1
The upper end and the lower end of 8 are respectively the upper end bracket 14
And bearings 22, 2 provided on the lower end bracket 20
It is rotatably supported by 2. Reference numeral 24 is a rotor of the electric motor, and 26 is a stator of the electric motor attached to the electric motor outer frame 28 side. A rotor blade 30 is provided on the rotor 24, and a coil 32 is wound around the stator 26. Further, the exhaust port 3 is provided on the upper and lower portions of the motor outer frame 28.
A plurality of 4 are provided. Further, each of the upper end bracket 14 and the lower end bracket 20 is provided with a plurality of intake ports 38, and the air guides 4 are provided.
0 is provided. The upper end bracket 14 is fixed to the upper portion of the electric motor outer frame 28 by tightening bolts 36.

In the conventional vertical axis drip-proof protection type motor constructed as described above, the cooling air on the upper part of the motor passes through the gap between the side surface of the upper end bracket 14 and the drip-proof cover 10 and passes through the upper end bracket 14. Is sucked into the inside of the electric motor through the air guide 40 by the rotor blade 30 as shown by an arrow to cool the coil 32,
The air is exhausted through an exhaust port 34 provided in the upper portion of the electric motor outer frame 28. Similarly, the rotor blades 30 are sucked into the electric motor through the air inlets 38 provided in the lower end bracket 20 through the air guides 40 as indicated by arrows.
The coil 32 is cooled and exhausted through an exhaust port 34 provided in the lower portion of the motor outer frame 28. Further, the entry of water droplets, dust, etc. from above into the intake port 38 provided on the upper end bracket 14 is protected by the drip-proof cover 10 provided above the upper end bracket 14.

[0004]

However, according to the vertical shaft drip-proof type electric motor described above, water drops from the upper part,
The drip-proof cover provided to prevent the entry of foreign matter such as dust,
As a result, the total length of the vertical axis motor is lengthened, and the size of the device is increased. Further, there is a problem that noise such as chattering noise and wind noise may be generated by the cooling air sucked through the gap between the side surface of the upper end bracket and the drip-proof cover.

Therefore, an object of the present invention is that the structure is simple and the total length of the electric motor is short, foreign matter such as water drops and dust can be prevented from entering from above, and the electric motor can be surely cooled. Moreover, it is an object of the present invention to provide a vertical shaft drip-proof electric motor that does not generate noise such as chattering noise or wind noise.

[0006]

In the vertical shaft drip-proof type electric motor according to the present invention, the opening is protected so as to prevent foreign matter from entering the rotating part and the conductive part, and is dropped at an angle within 15 degrees from the vertical. In a vertical axis drip-proof type electric motor that has a casing structure that protects water droplets from entering the body of the electric motor, the vertical axis of the vertical axis motor protrudes at least the required length from the outer diameter of the electric motor on the outer periphery of the upper end bracket of the electric motor. It is characterized in that a ring-shaped eave is provided.

Further, in the vertical axis drip-proof protection type electric motor according to the present invention, the opening is protected so that foreign matter does not enter the rotating portion and the conductive portion, and the water droplets falling at an angle within 15 degrees from the vertical are electric motors. In a vertical axis drip-proof type electric motor having a jacket structure that protects it from entering the inside of the machine, an annular eave protruding at least a required length from the outer diameter of the electric motor is provided on the outer periphery of the upper end bracket of the vertical axis motor. A plurality of air intakes for sucking cooling air may be provided in the lower part of the eaves, and the cooling air may be sucked from the air intakes and discharged from a plurality of air outlets provided in the outer frame of the electric motor. it can.

[0008]

According to the vertical shaft drip-proof type electric motor of the present invention, the annular eave which is provided on the outer periphery of the upper end bracket of the vertical shaft motor and protrudes at least a required length from the outer diameter of the electric motor is installed from above. It is possible to effectively prevent foreign matter such as water droplets and dust from entering.

Further, an annular eave protruding at least a required length from the outer diameter of the electric motor is provided on the outer periphery of the upper end bracket, and a plurality of intake ports for inhaling cooling air are provided at the lower part of the eave. By being configured to suck the cooling air from and to discharge it from a plurality of exhaust ports provided in the outer frame of the electric motor,
It effectively prevents foreign matter such as water droplets and dust from entering from above, and reduces the intake resistance during cooling air intake, which can reduce the occurrence of chattering noise, wind noise, and other intake noise, and reduce The total length can be shortened.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a vertical axis drip-proof protection type electric motor according to the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory view showing a jacket structure of a vertical axis drip-proof protection type electric motor according to an embodiment of the present invention. FIG. The view,
(B) is a partial cross-sectional elevation view. FIG. 2 is an enlarged partial sectional elevation view of the vicinity of the upper end bracket of the embodiment shown in FIG. For convenience of explanation, in FIGS. 1 and 2, the same components as those of the conventional example shown in FIG. 3 are designated by the same reference numerals, and detailed description thereof will be omitted. That is, the difference between the present embodiment and the conventional example is that, instead of providing the drip-proof cover on the upper end bracket as in the prior art, the outer peripheral portion of the upper end bracket 15 projects larger than the outer diameter of the electric motor outer frame 28. This is the point where the annular eaves 17 are provided and the point where the intake port 44 is provided in the lower portion of the eaves 17. The eaves 17 prevent foreign matters such as water drops 42 from the upper part of the electric motor from entering the intake port 44 and the exhaust port 34. As shown in FIG. 2, the eaves 17 is at least a required length longer than the outer frame 28 of the electric motor so that the eaves 17 does not enter the exhaust port 34 even when the water drop 42 falls at an angle within 15 degrees from the vertical. Is also provided so as to project.

With respect to the vertical shaft drip-proof type electric motor according to the present invention having the above-described structure, the cooling air of the electric motor is as shown in FIG.
As indicated by an arrow in (B) of FIG. 3, the coil 32 is sucked by the rotor blades 30 via the air guide 40 embedded in the electric motor through the intake port 44 provided on the lower side surface of the upper end bracket 15. Then, it is exhausted through an exhaust port 34 provided in the outer frame 28 of the electric motor. Further, similarly to the conventional case, the rotor blades 30 are sucked into the electric motor through the air inlets 38 provided in the lower end bracket 20 through the air guides 40 as shown by the arrows to cool the coils 32.
The air is exhausted through an exhaust port 34 provided in the lower portion of the electric motor outer frame 28. The eaves 17 provided on the upper end bracket 15
As shown in FIG. 2, it functions as a drip-proof cover. Therefore, the conventionally required drip-proof cover and parts related to the drip-proof cover are not required, the total length of the vertical axis drip-proof protection type electric motor can be shortened, and noise such as chattering noise and wind noise during intake is reduced.

[0013]

As is apparent from the above-described embodiments, the present invention eliminates the need for the drip-proof cover and the parts related to the drip-proof cover in the conventional structure, and reduces noise such as chattering noise and wind noise during intake. In addition to being reduced, the vertical axis of the drip-proof protection type electric motor is shortened to save space and reduce manufacturing costs by reducing the number of parts used, resource saving, quality improvement, innovative design at product design It produces immeasurable effects such as incarnation.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and various design changes can be made without departing from the spirit of the present invention. Is.

[Brief description of drawings]

1A and 1B are explanatory views showing an embodiment of a vertical axis drip-proof protection type electric motor according to the present invention, FIG. 1A is a plan view of a vertical axis drip-proof protection type electric motor, and FIG. It is a figure.

FIG. 2 is an enlarged partial cross-sectional elevation view of the vicinity of the upper end bracket of the vertical shaft drip-proof protection type electric motor shown in FIG.

3A and 3B are views for explaining the outer cover structure of a conventional vertical shaft drip-proof protection type electric motor, in which FIG. 3A is a plan view of the vertical shaft drip-proof protection type electric motor, and FIG. is there.

[Explanation of symbols]

 10 Drip-proof cover 12 Drip-proof cover mounting bolt 14 Upper-end bracket 15 Upper-end bracket 16 Drip-cover mounting seat 17 Eaves 18 Shaft 20 Lower-end bracket 22 Bearing 24 Rotor 26 Stator 28 Electric motor outer frame 30 Rotor blades 32 Coil 34 Exhaust port 36 Tightening bolt 38 Intake port 40 Air guide 42 Water drop 44 Intake port

Claims (2)

[Claims] 1. An outer cover structure that protects an opening to prevent foreign matter from entering a rotating part and a conductive part and protects a water drop falling at an angle within 15 degrees from the vertical from entering the body of an electric motor. In a vertical axis drip-proof type electric motor having a vertical axis drip-proof type, the outer circumference of an upper end bracket of the vertical axis motor is provided with an annular eave protruding at least a required length from the outer diameter of the electric motor. Electric motor. 2. An outer cover structure that protects an opening to prevent foreign matter from entering a rotating part and a conductive part and protects a water drop falling at an angle within 15 degrees from the vertical from entering the body of the electric motor. In a vertical axis drip-proof protection type electric motor having a vertical axis bracket, an annular visor protruding at least a required length from the outer diameter of the motor on the outer circumference of the upper end bracket of the vertical axis motor, and a plurality of cooling air intakes at the lower part of the visor. The vertical axis drip-proof protection type electric motor is characterized in that the cooling air is sucked from the intake port and is discharged from a plurality of exhaust ports provided in the outer frame of the electric motor.