JPH0223081Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a waterproof cover for a rotating machine, and particularly to a waterproof cover suitable for use in a rotating machine for a vehicle.

〓Conventional technology〓 For example, a car is equipped with an alternator, and the engine drives this alternator to obtain power generation output, which is used to charge a battery to operate various electrical components. I try to let them do it. And this alternator
A cooling fan is fixed to the rotating shaft on the front side and inside the pulley. This cooling fan introduces cooling air into the casing from the cooling air intake port on the rear side, and discharges this cooling air from the cooling air outlet on the front side, thereby cooling the inside of the alternator. This prevents deterioration of the insulation of the coil.

〓Problems to be solved by the invention〓 However, since such an alternator is arranged in the engine room, muddy water thrown up by the wheels is introduced into the casing of the alternator along with the cooling air. If such muddy water enters the alternator, it may come into contact with the coils and cause
This may cause deterioration of the coil insulation, and may even oxidize the slip ring or damage the bearing. Therefore, it is preferable to adopt a structure that prevents water and mud from entering the casing as much as possible. However, conventional alternators cannot completely prevent water and mud from entering the casing.

Japanese Utility Model Publication No. 55-95449 discloses that in a vertical rotating electric machine, a frame and an upper bracket are connected by a cylindrical intermediate cover, and an intermediate cover opening window is formed around the intermediate cover. The inner periphery of the cover has an inclined part that guides rainwater entering from the intermediate cover opening window to the outside, and a partition plate that extends toward the upper bracket and a wind guide that extends toward the rotating shaft. A vertical rotating electric machine has a lower bracket opening window formed around the bracket connected to the frame, and the bottom inner surface of the plate bracket is inclined so as to guide rainwater entering from the lower bracket opening window to the outside. A rainproof structure has been proposed.

With this structure, the partition plate of the intermediate cover can block raindrops introduced with the cooling air and allow them to flow outside through the slope.
This will prevent raindrops from entering the interior. However, this structure can only be applied to vertical rotating electric machines. This cannot be applied to horizontal generators such as alternators. Further, since the cooling fan is provided on the rotor side within the case, the present invention cannot be applied to a rotating electric machine having a cooling fan outside the front case.

The present invention was devised in view of these problems, and is a horizontal rotating machine that is used with the axis of rotation approximately horizontal, and a cooling fan is installed on the outside of the front casing. To provide a waterproof cover that reliably cools the inside of a rotating machine and prevents water and mud from entering the casing when cooling air is sucked.

〓Means for solving the problem〓 The present invention is a horizontal rotating machine that is used with the rotational axis being almost horizontal, and a transmission wheel and a cooling fan are attached to the rotational shaft that protrudes from the front side of the front casing. At the same time, a cooling air outlet is formed in the front casing, a cooling air inlet is formed in the rear casing, and a waterproof cover is attached to the rear casing so as to cover the cooling air inlet. An opening for introducing cooling air is formed in the inclined surface of the waterproof cover facing diagonally downward, and a partition plate is disposed inside the opening so as to face almost vertically or diagonally upward. , the partition plate is attached to the waterproof cover so that the outer peripheral part thereof is spaced apart from the inner surface of the waterproof cover, and a water drain part for draining water is provided at the bottom of the waterproof cover. be.

〓Operation〓 Therefore, when the rotor of this rotating machine is rotated, the cooling fan attached to the rotating shaft also rotates together. As the cooling fan rotates, cooling air is introduced into the main body of the rotating machine through the opening of the waterproof cover and the cooling air inlet of the rear casing, and the cooling air flows in the axial direction, causing the cooling air to be discharged from the front casing. The air will be forced out through the outlet by a cooling fan. Therefore, the inside of the rotating machine is cooled by this flow of cooling air. Furthermore, even if water or mud is introduced through the opening of the waterproof cover along with this cooling air, this water or mud is blocked by the partition plate placed inside the opening of the waterproof cover and guided downward. The water will be discharged to the outside of the waterproof cover through the water drain provided at the bottom of the waterproof cover.

〓Example〓 The present invention will be described below with reference to an illustrated example.
In this embodiment, the present invention is applied to a waterproof cover for an alternator, which is widely used as an automobile generator, and this alternator has a structure as shown in FIG. That is, the alternator includes a pair of cup-shaped casings 1 and 2, and these casings 1 and 2 are connected by a connecting bolt 3.
Furthermore, stator core 4 is provided by casings 1 and 2.
A stator coil 5 constituting an armature coil is wound around the stator core 4. The stator coil 5 is connected to a diode 6, which rectifies the generated output and supplies it to the battery.

The casings 1 and 2 hold bearings 7 and 8, respectively, and these bearings 7,
A rotary shaft 9 is rotatably supported by 8. A pair of rotor cores 1 are attached to this rotating shaft 9.
The claws 12 are attached in alternating combinations so that the claws 0 and 11 face each other. A rotor coil is wound between the pair of rotor cores 10 and 11, and a field current is supplied to this rotor coil via a brush 13 and a slip ring 14.

Therefore, the rotating shaft 9 is located on the front side of the casing 1.
When the engine drives the pulley 15 attached to the rotor coil, the magnetic flux passing through the claws 12 of the rotor cores 10 and 11 magnetized by the rotor coil passes through the stator core 4, and at this time, the stator coil 5 and interlink. Therefore, an electromotive force is induced in the stator coil 5, and power generation is performed. This power generation output is rectified and taken out by a diode 6, and is used to charge a battery via a regulator circuit.

A cooling fan 16 is attached to the pulley 15.
is provided, and this fan 16 connects to the pulley 15.
By rotating with the casing, air is introduced into the casing from the cooling air inlet 17 of the casing 2, and air is discharged from the cooling air outlet 18 of the casing 1 on the front side. The interior of this generator is designed to be cooled by the air flow accompanying the generator.

Next, a waterproof cover 20 is attached to the end opposite to the end where the cooling fan 16 of this alternator is attached, that is, the rear end.
To explain the structure, as shown in FIGS. 1 and 2, this waterproof cover 20 is formed by press working a steel plate, and has a cup-like shape that is asymmetrical in the top and bottom. A pair of attachment parts 21 are integrally connected to the upper side of the cover 20 on the outer circumferential side, and the attachment parts 21 are fixed to an arm 23 integrally connected to the casing 2 via bolts 22. It is becoming more and more common.

A circular opening 24 is formed approximately in the center of this waterproof cover 20, and cooling air is introduced into the cover 20 through this opening 24. Furthermore, a partition plate 25 is provided inside the opening 24. The partition plate 25 has a substantially circular shape and is one size larger than the opening 24. And this partition plate 25
is spaced apart from the edge of the opening 24, and its outer periphery is spaced from the inner periphery of the cover 20,
Cooling air can flow around the side edges of the partition plate 25.

A strip-shaped attachment piece 26 is formed on the upper part of the partition plate 25.
is welded and fixed to the inside of a recess 27 formed in the upper part of the cover 20. The lower portion of the partition plate 25 is welded and fixed to a mounting piece 28 formed at the edge of the opening 24 of the cover 20. Furthermore, this waterproof cover 20 has
A water drain portion 29 is formed on the lower side thereof. The water draining portion 29 is formed by drawing, and is composed of a concave portion projecting downward (see FIG. 3).

Therefore, when the cooling fan 16 is rotationally driven by the engine via the pulley 15, cooling air is introduced into the waterproof cover 20 through the opening 24 formed in the center of the cover 20. This cooling air bypasses the side of the partition plate 25 arranged inside the opening 24, reaches the inside of the partition plate 25, passes through the cooling air inlet 17 of the casing 2, and enters the casing 2.
The air is introduced into the alternator, cools the inside of the alternator as described above, and is discharged through the cooling air outlet 18 of the casing 1.

However, the mud and water that entered the cover 20 through the opening 24 along with the cooling air cannot bypass the sides of the partition plate 25 due to its weight, and is blocked by the partition plate 25. .
The mud and water blocked by the partition plate 25 in this way flows downward along the partition plate 25, and as shown by the dotted line in FIG. 29, and is discharged to the outside through this water draining portion 29.

As described above, according to the alternator according to this embodiment, the waterproof cover 20 attached to the rear side can prevent water and mud from entering the inside of the casing. Therefore, this makes it possible to prevent water and mud from coming into direct contact with the stator coil 5 or the rotor coil disposed between the pair of rotor cores 10 and 11, thereby preventing insulation deterioration of the coil. It can be prevented. Furthermore, it is possible to prevent the slip ring 14 from being oxidized by water or mud, or from water entering the bearings 7 and 8, which prevents them from operating smoothly.

Although the present invention has been described above with reference to an illustrated embodiment,
The present invention is not limited to the above embodiments, and various modifications can be made based on the technical idea of the present invention. For example, the above embodiment relates to a waterproof cover for an alternator that constitutes a generator for a vehicle, but the present invention can be widely used for waterproof covers for various other rotating machines.

〓Effects of the invention〓 As described above, the present invention has a transmission wheel and a cooling fan attached to the rotating shaft protruding from the front side of the front casing, and a cooling air outlet is formed in the front casing. A cooling air inlet is formed in the rear casing, and a waterproof cover is attached to the rear casing to cover the cooling air inlet, and an opening for introducing cooling air is provided on the downwardly slanted surface of this waterproof cover. In addition, a partition plate is arranged inside the opening so as to face almost vertically or diagonally upward, and a waterproof cover is arranged so that the outer periphery of the partition plate is spaced from the inner surface of the waterproof cover. In addition, a water drain is provided at the bottom of the waterproof cover for draining water.

Therefore, the cooling fan is rotationally driven by the operation of the rotary machine, and the cooling fan introduces cooling air into the waterproof cover through the opening of the waterproof cover. The cooling air flows into the rotating machine through the cooling air inlet in the rear casing, and is forcibly exhausted from the cooling air outlet in the front casing. Therefore, an increase in temperature inside the rotating machine is prevented, and deterioration of the insulation of the coil can be avoided.

Moreover, the opening of the waterproof cover is formed on an inclined surface facing diagonally downward, and the partition plate is arranged inside the opening so as to face almost vertically or diagonally upward. The space inside the opening of the waterproof cover forms a V-shaped space that is wide at the top and narrow at the bottom. Furthermore, the partition plate is arranged such that its peripheral edge is spaced apart from the inner surface of the waterproof cover. Therefore, the air introduced through the opening formed in the downwardly facing inclined surface of the waterproof cover flows diagonally upward, bypassing the partition plate, and prevents the introduction of cooling air. Less resistance. Therefore, it becomes possible to cool the inside well.

Moreover, since the partition plate is arranged in the waterproof cover so as to face almost perpendicularly or diagonally upward to the opening formed in the inclined surface facing diagonally downward, water can enter through the opening. At the same time, the air introduced through the opening begins to flow obliquely upward. Therefore, from this, water and mud contained in the cooling air are separated more reliably when flowing diagonally upward, and fall onto the partition plate, and also pass through the sides of this partition plate to the waterproof cover. The water will be drained from the drain at the bottom. Therefore, it becomes possible to separate water and mud without impairing the flow of cooling air, and it becomes possible to prevent water and mud from entering the inside of the rotating machine.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an alternator equipped with a waterproof cover according to an embodiment of the present invention, Fig. 2 is a front view of the waterproof cover removed from the alternator, and Fig. 3 is a main part of this waterproof cover. FIG. In addition, in the reference numerals used in the drawings, 17... cooling air inlet, 20... waterproof cover, 24... opening, 25... partition plate, 29... water draining part.

Claims (1)

[Scope of utility model registration request] In a horizontal rotating machine that is used with the rotational axis substantially horizontal, a transmission wheel and a cooling fan are attached to the rotating shaft protruding from the front side of the front casing, and a cooling air outlet is formed in the front casing. However, a cooling air inlet is formed in the rear casing, and a waterproof cover is attached to the rear casing so as to cover the cooling air inlet, and a cooling air inlet is formed on the inclined surface of the waterproof cover that faces diagonally downward. An opening for introducing wind is formed, and a partition plate is arranged inside the opening so as to face almost vertically or diagonally upward, and the outer periphery of the partition plate is formed on the inner surface of the waterproof cover. A waterproof cover for a rotating machine, characterized in that the waterproof cover is attached to the waterproof cover so as to be spaced apart from the waterproof cover, and further includes a water drain part for draining water at the bottom of the waterproof cover.