JPH0226208Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a drip-proof protected rotating electrical machine with an improved stator frame.

[Technical background of the invention and its problems]

According to JISC4004 "General Rules for Rotating Electrical Machines," drip-proof protected rotating electrical machines have a structure that will not be adversely affected by water droplets falling within 15 degrees from the vertical, and must be designed so that fingers or other objects do not come into contact with rotating or conductive parts inside the machine. It is stipulated that solid foreign matter exceeding 12 mm in diameter should not enter the product.

For this reason, the structure of conventional drip-proof protected rotating electric machines is
It looked like Figure 1. A plurality of inside air exhaust ports 2 for discharging inside air are bored on the outer peripheral surface near one end of the stator frame 1. A wire mesh 3 is fixed to the outside of the inside air exhaust port 2 with mounting bolts 4 to prevent solid foreign matter with a diameter exceeding 12 mm from entering the inside of the machine through the inside air exhaust port 2. From the vertical of this inside air outlet 2
In order to prevent harmful effects from water droplets falling in a direction within 15 degrees, there is a
A protrusion 5 is provided along the inner circumference of the stator frame 1 in the axial direction. On the load side of the stator frame 1, there is a load side bracket 8 which has a housing supporting a load side bearing 6 in the center and has an outside air intake port 7 on the outer periphery for sucking outside air from the radial direction. It is fixed via a plate 9. The outside air intake port 7 has a diameter of 12 mm on the inside of the machine.
The wire mesh 10 is fixed with mounting bolts 11 to prevent solid foreign matter larger than mm from entering the machine.

On the other hand, on the anti-load side of the stator frame 1, there is provided an anti-load side bracket 14 which has a housing supporting an anti-load side bearing 12 in the center and has an outside air intake port 13 for sucking outside air into the machine from the axial direction. It is fixed via a plate 15. The outside air intake port 13 of this anti-load side bracket 14 is designed to have a diameter of 12 mm or less to prevent solid foreign matter with a diameter exceeding 12 mm from entering the machine. A drip-proof cover 1 is attached to the upper part of the anti-load side bracket 14 on the outside of the machine.
6 is fixed to the stator frame 1 with mounting bolts 17. Furthermore, a stator core 19 containing a winding 18 is inserted inside the stator frame 1, and this stator core 19
The rotor 20 is connected to the load side bearing 6 through the inner diameter gap of
and is rotatably supported via a counter-load side bearing 12.

When a drip-proof protected rotating electric machine configured as described above is installed with the axis horizontal, water droplets falling in a direction within 15 degrees from the vertical will hit the outside air intake port 7 provided on the load side bracket 8 and the stator frame 1. Air enters the inside of the machine through the provided inside air outlet 2 and the drip-proof properties are no longer satisfied. Therefore, the outside air intake port 7 of the load side bracket 8
is provided on the lower half side of the load side bracket 8, as shown in FIG. 2, which shows a cross section taken along the - line in FIG. This was to prevent falling water droplets from entering the cabin. Furthermore, the inside air outlet 2 of the stator frame 1 is arranged as shown in FIG. 3 and FIG. 4, which shows a cross section taken along the line - in FIG. In other words, internal air exhaust ports 22 are provided on the load side and anti-load side of the stator frame 1, and an armor 23 is attached with mounting bolts 24 to prevent water droplets and solid foreign objects with a diameter exceeding 12 mm from falling in a direction within 15 degrees from the vertical. I was trying not to get into the plane.

In the conventional configuration as described above, when the rotating electric machine is mounted in the shaft vertical direction and the shaft horizontal direction, it is necessary to change the structure of the inside air outlet of the stator frame. This requires two types of molds for casting the stator frame. Furthermore, general-purpose drip-proof protected rotating electric machines are manufactured in batches and delivered on a pre-delivery basis, so it takes twice as much time, effort, and storage to prepare and produce two types of drip-proof protected rotating electric machines with different mounting directions. There are drawbacks such as the need for space.

[Purpose of invention]

The present invention improves the above-mentioned drawbacks by providing a protrusion facing the stator core supporting rib surface on the inside of the stator frame near the inside air outlet, and connecting the rib surface, the protrusion surface, and the endpiece. eaves horizontally
The purpose is to provide a drip-proof protected rotating electrical machine that can be installed in either the shaft vertical direction or the shaft horizontal direction by attaching these at an angle of 15 degrees or more to the drip-proof protected rotating electrical machine. shall be.

[Summary of the idea]

The present invention uses a drip-proof protected rotating electrical machine that has internal air exhaust ports in the stator frame that supports the stator core of the rotating electrical machine. The hypotenuse, the internal air exhaust port drilled along the longitudinal axis of both sides on the stator frame surface of this stator core supporting rib, and the internal air outlet from the stator frame on the inside of the stator frame near this internal air exhaust port. A protrusion formed to protrude toward the hypotenuse, a protrusion hypotenuse that expands and inclines toward the outside of the aircraft from the base of the protrusion, an armrest formed of a plurality of eaves, the angle of the hypotenuse and the protrusion hypotenuse, and the angle of the eaves. This is a drip-proof protected rotating electrical machine in which the mounting angle is inclined at an angle θ with respect to the horizontal, and the armor is mounted on the outside of the inside air outlet. As a result, whether the drip-proof protected rotating electric machine is installed vertically or horizontally of the shaft, the drip-proof protection regulations can be satisfied. This eliminates the need to prepare two types of casting molds for the stator frame as in the past, reducing the manufacturing cost of casting molds by half, and since the structure of the stator frame is the same, the manufacturing process is standardized, improving productivity and inventory management. improves.

[Example of idea]

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

FIG. 5 is a sectional view of a drip-proof protected rotating electrical machine showing an embodiment of the present invention, and FIG. 6 is a sectional view taken along the line - in FIG. However, parts that are the same as those in the prior art described above will be designated by the same reference numerals and detailed explanations will be omitted.

As shown in FIG. 5, stator core supporting ribs 26 (hereinafter simply referred to as ribs) are disposed facing each other from the surfaces of both side surfaces of the stator frame 1 and extending toward the inside of the machine. Also, on both sides of the surface of the stator frame 1 of this rib 26, there are inside air exhaust ports 25a along the axial length direction.
and 25b are drilled, respectively. A protrusion 27 protrudes from the stator frame 1 toward the rib 26 near the inside air exhaust ports 25a and 25b on the inside of the stator frame 1.
a and 27b are provided in the axial direction so as to correspond to the inside air exhaust ports 25a and 25b, respectively. This protrusion 2
The oblique side 28 of the rib 26 opposite to 7a and 27b forms an angle of θ° with respect to the horizontal. Furthermore, this protrusion 27
There are protrusion oblique sides 32a and 32b that expand and incline at an angle of θ° from the roots of the protrusions a and 27b toward the outside of the machine, and these protrusion oblique sides 32a and 32b constitute the side opposite to the oblique side 28 of the inside air exhaust ports 25a and 25b. Further, armor pieces 29 are fixed to the outside of the inside air exhaust ports 25a and 25b using mounting bolts. The plurality of eaves 30 constituting this armor 29 form an angle of θ° with respect to the horizontal. The above θ shall all be 15° or more. Further, the dimensions of the opening 31 of the armor 29 are such that solid foreign matter exceeding 12 mm in diameter will not enter.

The operation of the drip-proof protected rotating electric machine configured in this way will be explained. 5th drip-proof protected rotating electric machine
When installed vertically to the axis as shown in the figure, the eaves 30 of the end pieces 29 attached to the inside air exhaust ports 25a and 25b of the stator frame 1 are installed at an angle of 15° or more with respect to the horizontal. So, from vertical
Water droplets falling in a direction within 15 degrees will not enter the interior of the machine. Also, the opening 31 of the endpiece 29 has a diameter of 12
It is designed to prevent solid foreign objects larger than mm from entering the cabin. Therefore, the armor 29 prevents water droplets and solid foreign matter from entering the machine, and satisfies the standards of JISC4004 "General Rules for Rotating Electric Machinery".

Next, when the drip-proof protected rotating electric machine is installed in the axial horizontal direction as shown in FIG. 6, the inside air outlet 25a at the upper part and the inside air outlet 25b at the lower part will be explained separately. At the upper part of the inside air outlet 25a, the oblique side 28 of the rib 26 is inclined with respect to the horizontal direction.
It is attached more than 15 degrees. Therefore, water droplets falling in a direction within 15 degrees from the vertical are
This prevents water droplets from entering the inside of the machine.

On the other hand, in the lower part of the inside air outlet 25b,
Water droplets falling in a direction within 15 degrees from the vertical are caught by the lower protrusion 27b. Then, it flows over the protrusion oblique side 32b which becomes the lower part and comes out of the machine, so
This prevents water droplets from entering the cabin. Additionally, the armor 29 prevents solid foreign objects with a diameter exceeding 12 mm from entering the aircraft interior. Even if the shaft is installed horizontally in this way, the armor 29 prevents solid foreign matter from entering, and water droplets are removed from the oblique side 28 of the rib 26 or the protrusion 2.
7b and the protruding oblique side 32b can prevent intrusion into the machine and satisfy the JISC4004 standard.

[Effect of idea]

As described above, according to the present invention, the oblique sides of the stator core supporting ribs and the oblique sides of the protrusions arranged on the inside of the stator frame are set at an angle of 15° or more with respect to the horizontal, and the protrusions and the oblique sides are inclined at an angle of 15° or more with respect to the horizontal. By installing an armor made of a canopy on a drip-proof protected rotating electric machine, the drip-proof protection regulations can be met regardless of whether the drip-proof protected rotating electric machine is installed vertically or horizontally of the shaft. can be satisfied. This eliminates the need to prepare two types of casting molds for the stator frame as in the past, reducing the manufacturing cost of the casting mold by half, and since the stator frame structure is the same, the manufacturing process is standardized, improving productivity and inventory management. do.

[Brief explanation of drawings]

Figure 1 is a side view including a cross section of a conventional drip-proof protected rotating electrical machine, Figure 2 is a sectional view taken along the - line in Figure 1 in the direction of the arrow, and Figure 3 is a side view of a conventional drip-proof protected rotating electrical machine. A side view including a cross section, Fig. 4 is the − of Fig. 3.
5 is a side view including a cross section of a drip-proof protected rotating electrical machine showing an embodiment of the present invention; FIG. 6 is a sectional view taken in the direction of the arrow along the - line in FIG. 5; FIG. It is. 1... Stator frame, 2, 25... Internal air exhaust port, 1
9... Stator core, 26... Stator core supporting rib, 27a, 27b... Protrusion, 28... Oblique side, 2
9...Armor, 30...Eaves, 32a, 32b
...Protrusion hypotenuse.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a drip-proof protected rotating electrical machine that has internal air exhaust ports in the stator frame that supports the stator core of the rotating electrical machine, the air vents are formed to widen from the surface of the stator frame toward the inside of the machine. The oblique side of the stator core supporting rib, the inside air outlet bored along the longitudinal direction of both sides of the stator frame surface of this stator core supporting rib, and the stator frame near this inside air outlet. a protrusion formed on the inside of the machine so as to protrude from the stator frame toward the oblique side;
The oblique side of the protrusion expands and inclines toward the outside of the machine from the base of the protrusion, the armrest is formed by a plurality of eaves, and the angles of the oblique side and the oblique side of the protrusion and the mounting angle of the eaves are each inclined at an angle θ with respect to the horizontal. ,
A drip-proof protected rotating electric machine, characterized in that the armor is attached to the outside of the inside air outlet. (2) The drip-proof protected rotating electric machine according to claim 1, wherein the angle θ is 15° or more with respect to the horizontal.