JP2848972B2 - Submersible rotary electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submersible rotating machine in which magnetic impurities such as iron powder in a liquid do not damage windings and bearings during operation of a submersible rotating electric machine filled with oil or the like. Regarding electric machinery.

[0002]

2. Description of the Related Art FIG. 2 is a sectional view of a conventional example, in which an electric motor 4 directly connected to a pump 3 is immersed and fixed in a tank 2 containing oil 1. A cylindrical rotor 9 is arranged through a gap inside a cylindrical stator 8 surrounded by a jacket 7 composed of a frame 5 and a bracket 6, and a shaft 10 for fixing the rotor is provided.
Are rotatably supported on the jacket 7 via bearings 11a and 11b, and the cooling holes 12a, 12b and 12 are formed in the jacket.
c and 12d are provided to fill the liquid. The stator 8 includes a winding 8a, and the bearings 11a and 11b are attached to the housings 6a and 6b of the jacket 7. The tank 1 has a gentle oil flow 13 indicated by a broken line by the pump 3, the electric motor 4 has an oil flow 14 indicated by a solid line due to the rotation of the rotor 9 and the shaft 10, and magnetic impurities such as iron powder. An object is captured by the magnet 15 provided in the tank.

[0003]

In the above-mentioned prior art, since there are the flows 13 and 14 of the oil 1, the magnetic impurities in the oil are adsorbed by the magnet 15 provided on the wall of the tank 1 and the winding of the stator is performed. The wire 8a and the bearings 11a and 11b are prevented from being damaged. However, since not all the oil 1 flows near the magnet 15, magnetic impurities that have entered through the cooling holes 12a, 12b, 12c, and 12d cannot help harming the winding 8a and the bearings 11a and 11b at all. . That is, the oil flow 14 due to the pumping action on the end face of the rotor 10 goes from the inner diameter side to the outer diameter side, so that as shown by the arrow in FIG. The oil sucked from the opening located closer to the axis among the openings provided on the end face is directly discharged from the opening located farther from the axis, and this vortex or turbulent flow agitates the oil in the tank. , And it becomes easy to spread magnetic impurities.

An object of the present invention is to prevent windings and bearings from being damaged by magnetic impurities mixed in a liquid from entering a cooling hole provided in a casing of a submersible rotary electric machine filled with oil or the like. It is an object of the present invention to provide a submersible rotary electric machine that can prevent the occurrence of the problem.

[0005]

In the submersible rotary electric machine according to the first aspect of the present invention, a cylindrical rotor is disposed through a gap inside a cylindrical stator surrounded by a jacket, and the rotor is fixed. In a submersible rotary electric machine in which a shaft is rotatably supported on the jacket via a bearing and a liquid exists inside the jacket, a drain port provided on the jacket on the winding side of the stator. A liquid suction port provided on the bracket side of the jacket and near the bearing; and a rotor that is inclined from the outer circumference of the liquid suction port toward the inner circumference to cover the upper surface of the opening of the liquid suction port. And a liquid guide provided up to near the end face, and the liquid guide is formed from a permanent magnet. In this case, the liquid guide may be constituted by a guide made of a mechanical structural material and a permanent magnet plate having elasticity as in Invention 2, and the permanent magnet plate may be fixed to the guide fixed to the outer casing. .

[0006]

In the invention 1, both ends of the rotor 9 exhibit a pumping action by centrifugal force, suck liquid from the liquid suction port 21 of the liquid guide 25 extending from the outer cover 7, and draw liquid from the liquid discharge port 22. To discharge. At that time, the magnetic impurities in the liquid are attracted to the liquid guide 25 made of a permanent magnet by a magnetic force and do not adhere to the stator windings 8a and the bearings 11a and 11b. prevent. In the second aspect, if the liquid guide 25 is constituted by the guide 23 made of a mechanical structural material such as an iron plate or a synthetic resin and the permanent magnet plate 24 having elasticity such as a so-called rubber magnet, the liquid guide 25 becomes cylindrical or conical. It is easy to form as a trapezoid, and it is suitable for various small-lot production.

[0007]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, in which components denoted by the same reference numerals as those of the prior art have approximately the same functions, and duplicate description may be omitted. In the figure, an electric motor 4 directly connected to a pump 3 is immersed and fixed in a tank 2 containing oil 1. A cylindrical rotor 9 is arranged through a gap inside a cylindrical stator 8 surrounded by a jacket 7 composed of a frame 5 and a bracket 6, and a shaft 10 for fixing the rotor is mounted on a bearing 1.
The outer casing 7 is rotatably supported on the outer casing 7 via 1a and 11b, and the outer casing 7 is filled with liquid. The stator 8 is a winding 8
a, and the bearings 11a, 11b
a, 6b.

As a characteristic structure of the embodiment, a winding 8a of the stator 8 and a housing 6 of the bearings 11a and 11b are provided.
The liquid guide 25 extends from the jacket 7 to near both ends of the rotor 9 between a and 6b. The liquid guide 25 itself is formed of a permanent magnet, but may be formed of a guide 23 made of a mechanical structural material such as an iron plate and a permanent magnet 24 having elasticity also called a so-called rubber magnet. The outer jacket 7 (frame 5) of the liquid guide 25 on the side of the winding 8a.
, And a liquid suction port 21 is provided on the housing 7 (bracket 6) of the liquid guide 25 on the housing side.

According to such a structure, both end surfaces of the rotor 9 exhibit a pumping action by centrifugal force, and suck the liquid from the liquid suction port 21 of the liquid guide 25 extending from the outer cover 7 to discharge the liquid. Discharge the liquid from 22. At that time, the magnetic impurities in the liquid are attracted to the liquid guide 25 made of a permanent magnet by a magnetic force and do not adhere to the stator windings 8a and the bearings 11a and 11b. prevent. The solid arrow 26 indicates the flow of oil. When the liquid guide 25 is constituted by the guide 23 made of a mechanical structure material such as an iron plate or a synthetic resin and the permanent magnet plate 24 having elasticity such as a so-called rubber magnet, the liquid guide 25 can be formed in a cylindrical shape or a truncated cone shape. It is suitable for various kinds of small volume production. The permanent magnet plate 24 is preferably attached to both sides of the guide 23, but is preferably on the liquid absorbing side when it is on one side. Adhesives and rivets are used for attachment, but when the guide 23 is a magnetic material, the permanent magnet plate 24 may be attracted by its own magnetic force.

[0010]

According to the submersible rotary electric machine of the present invention, a cylindrical rotor is disposed through a gap inside a cylindrical stator surrounded by a jacket, and a shaft for fixing the rotor is provided with a bearing. A liquid discharge port provided in the outer cover on the winding side of the stator, wherein the outer cover is rotatably supported by the outer cover via a liquid, and a liquid is present inside the outer cover. A suction port provided on the bracket side and in the vicinity of the bearing, and provided near the end face of the rotor so as to incline from the outer circumference of the suction port toward the inner circumference and cover the upper surface of the opening of the suction port; And a liquid guide provided, and the liquid guide is formed from a permanent magnet. According to such a configuration, the pumping action by the end face of the rotor leads the liquid from the liquid suction port to the liquid discharge port by the liquid guide, and at this time, the liquid guide composed of the permanent magnet is a magnetic contaminant in the liquid. Is effectively adsorbed to prevent the particles from adhering to the windings and bearings, and to prevent them from being damaged by magnetic contaminants in the liquid.
The liquid guide is composed of a guide made of a mechanical structural material and a permanent magnet plate having elasticity, and the permanent magnet plate is fixed to the guide fixed to the outer cover, so that the shape of the liquid guide is complicated. Even if there is, there is an effect that it can be easily configured.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment.

FIG. 2 is a sectional view of a conventional example.

[Description of Signs] 1 Oil 4 Motor 5 Frame 6 Bracket 6a Housing 6b Housing 7 Jacket 8a Winding 9 Rotor 11a Bearing 11b Bearing 13 Oil Flow 15 Permanent Magnet 21 Suction Port 22 Drain Port 23 Guide 24 Permanent Magnet Plate 25 Liquid guide 26 Oil flow

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-185264 (JP, A) JP-A-4-248344 (JP, A) JP-A-1-109253 (JP, U) JP-A-1-185253 66464 (JP, U) Japanese Utility Model Showa 64-3072 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02K 5/10-5/132 H02K 5/20 F04D 13/08 F02M 37/22

Claims (2)

(57) [Claims] 1. A cylindrical rotor is disposed inside a cylindrical stator surrounded by a casing via a gap, and a shaft for fixing the rotor is rotatably mounted on the casing via a bearing. Let me support
In a submersible rotary electric machine in which a liquid exists inside and outside of the jacket, a drain port provided on the jacket on the winding side of the stator, and a bracket provided on the bracket side of the jacket and near the bearing. And a liquid guide that is inclined from the outer periphery of the liquid inlet to the inner peripheral side and that is provided up to near the end face of the rotor so as to cover the upper surface of the opening of the liquid inlet. A submersible rotary electric machine characterized in that the motor is formed from a permanent magnet. 2. The submersible rotary electric machine according to claim 1, wherein said liquid guide comprises a guide made of a mechanical structural material and a permanent magnet plate having elasticity, and said permanent magnet is attached to said guide fixed to said jacket. A submersible rotary electric machine characterized by fixing a plate.