JPH04161039A - Slip ring device - Google Patents

Abstract

PURPOSE:To collect brush powder automatically and securely to the filter of an exhaust port by sucking the brush powder to the end of a slip ring cover and springing the powder to the inner periphery of the slip ring cover by centrifugal force. CONSTITUTION:Brushes 2 are always in contact with slip rings 1, therefore, they are worn to produce fine brush powder 7. The brush powder 7 is immediately sucked in the direction of the end of a slip ring cover 3 with a suction fan 5 fixed to the end of a rotor shaft 8. Because the brush powder 7 is heavier than air, it is thrown to the inner periphery of the slip ring cover corresponding to the suction fan 5 by centrifugal force, collected to an ejection path 3a, filtered by a filter 6 at the tip of an ejection port 3b, and removed. Therefore, the brush powder 7 is easily collected and removed by replacing the filter 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a slip ring device for a wire-wound electric motor, and more particularly to a slip ring device that removes brush dust generated from brushes that are in sliding contact with the slip ring.

[Conventional technology]

5 and 6 are a partially broken front view and a side sectional view showing a conventional slip ring device. In the figures, 1 is a metal attached to a rotor shaft 8 of an electric motor via an insulator 9. A slip ring as a ring, 2 a slip ring cover that houses the slip ring 1 and a brush 2, and 4 an inspection window provided in the slip ring cover 3.

Next, the operation will be explained.

While rotating together with the rotor shaft 8 of the electric motor, the slip ring 1 continues to pass current between it and the brushes 2, supplies the current to the rotor windings, and rotates the rotor relative to the stator. . Here, since the brush 2 is constantly in contact with the slip ring 1, it becomes relatively worn. In this case, wear of the slip ring 1 is inconvenient for maintenance, so the brush 2 is generally made of a material that wears more easily, so that it is easier to maintain, inspect, and replace the brush. It's Nishide.

Therefore, the worn brush 2 as described above turns into brush powder and falls while scattering inside the slip ring cover 3, and most of it accumulates at the bottom.

[Problem to be solved by the invention]

Since the conventional slip ring device is configured as described above, in order to remove the brush powder that has accumulated at the bottom of the slip ring cover 3, a The inspection window 4 must be opened, which is a complicated and time-consuming process, and there are other problems in that it is not always possible to clean the inspection window thoroughly.

The invention of the first claim was made in order to solve the above-mentioned problem, and provides a slip that can easily collect brush dust through a filter using the suction force and centrifugal force of an intake fan. The purpose is to obtain a ring device.

Moreover, the invention of the second claim aims to provide a slip ring device which can suck the brush powder accumulated at the bottom of the slip ring with a brush powder suction device and reliably collect the dust with a filter. .

[Means to solve the problem]

The slip ring device according to the invention of the first claim includes:
A slip ring that is attached to a rotor shaft of a wire-wound electric motor and rotates while slidingly contacting brushes to supply power to one rotor winding and a stator winding, and the rotor that includes the slip ring and the brushes. a slip ring cover surrounding the shaft end; and a slip ring cover attached to the rotor shaft end;
It is equipped with an intake fan that sucks brush powder caused by the friction of the brush toward the end of the slip ring cover and radiates it to the inner circumference of the slip ring cover using centrifugal force. It is collected at the exhaust port and filtered through a filter.

Further, the slip ring device according to the invention of the second claim is attached to the rotor shaft of a wire-wound electric motor, rotates while slidingly contacting the brushes, and supplies power to the rotor winding and the stator winding. A slip ring cover that surrounds the end of the rotor shaft including the slip ring and the brush, and a brush dust receiving part provided at the bottom of the slip ring cover. Brush powder that has fallen onto the floor is forcibly sucked toward the exhaust port by a brush powder suction device, and the sucked brush powder is collected at the exhaust port and filtered by a filter.

[Effect]

The intake fan according to the invention of the first claim immediately sucks the brush powder scattered from the brush toward the end side of the slip ring cover while it is scattered, and further splashes it to the inner periphery of the slip ring cover by centrifugal force. , the brush powder can be concentrated near the end of the slip ring cover, and therefore the brush powder can be automatically and reliably collected at the filter part of the exhaust port.

Further, the brush powder suction device according to the second claim of the invention forcibly sucks the brush powder that has been scattered from the brush and accumulated over the entire bottom area of the slip ring cover due to natural fall into the exhaust port, and uses a filter. You can collect this and dispose of it at your discretion.

[Embodiments of the invention]

Hereinafter, one embodiment of the invention of the first claim will be described with reference to the drawings.

In Figures 1 and 2, 1 is a slip ring, 2
3 is a brush, and 3 is a slip ring cover, at the end of which there is a discharge passage 3 with a wall that continues to a part of the inner peripheral surface.
a is provided, the end of which serves as an air outlet 3b. Reference numeral 4A denotes an intake window which also serves for inspection, and is provided with, for example, a plurality of intake holes. 5 is an intake fan attached to the end of the rotor shaft 8, 6 is a filter provided at the end of the above-mentioned exhaust port 3b of the slip ring cover 3, and 7 is collected at the bottom of the slip ring cover 3 toward the exhaust port 3b. It is a brush powder that can be used.

Next, the operation will be explained.

The slip ring 1 rotates together with the rotor shaft 8 by the operation of the electric motor, while passing a current between the slip ring 1 and the brush 2, and supplying the current to the rotor winding. At this time, the brush 2 is constantly in contact with the slip ring 1, so it wears out.
Generates fine brush powder 7. This brush powder 7 is immediately sucked toward the end of the slip ring cover 3 by the intake fan 5 attached to the end of the rotor shaft 8. Also,
Since the brush powder 7 is heavier than air, it is blown away by centrifugal force toward the inner circumferential side of the slip ring cover corresponding to the intake fan 5, and collected in the discharge passage 3a. Furthermore, this brush powder 7 can be filtered and removed by a filter 6 provided at the tip of the discharge port 3b. For this reason, brush powder 7
Dust collection and cleaning can be easily carried out by replacing the filter 6. Note that the air from which the brush powder 7 has been removed is discharged to the outside of the slip ring cover 3 via the filter 6.

3 and 4 are a partially broken front view and a side sectional view showing an embodiment of the invention according to the second claim, in which 1 is a slip ring, 2 is a brush, and 10 is a slip ring. 1, a slip ring cover having a brush dust receiving part 11 on the bottom corresponding to the substantially entire axial length region of 1; 4A is an intake window which also serves as an inspection purpose; 10a is a discharge ring having a wall surface continuous to the brush dust receiving part 11; 10b is a discharge port at the end of the discharge passage 10a, 12 is a brush dust suction device as a vacuum cleaner provided in the discharge passage 10a, and 13 is a filter.

Next, the operation will be explained.

Since the brush 2 is constantly in contact with the slip ring 1, it wears out and generates fine brush powder 7 as described above.
This brush powder 7 scatters, falls, and accumulates on the brush powder receiving portion 11 at the bottom of the slip ring cover 3, which includes the entire axial region of the slip ring.

In this way, the brush powder that has fallen onto the brush powder receiving section 11 is removed by the brush powder suction device 1 in the discharge passage 10a.
2, it is forcibly sucked out in the direction of the discharge port 10b,
It adheres to the filter 13 and is collected. Therefore, the inside of the slip ring cover 3 can be easily and quickly maintained by cleaning or replacing the filter 13, and the inside of the slip ring cover 3 can be automatically maintained in a clean state at all times while the motor is operating.

〔Effect of the invention〕

As described above, according to the invention of the first claim, the rotor shaft is attached to the rotor shaft of a wire-wound motor, rotates while slidingly contacting the brushes, and supplies power to the rotor winding and the stator winding. a slip ring that surrounds the end of the rotor shaft including the slip ring and the brush, and a slip ring cover that is attached to the end of the rotor shaft to prevent brush powder caused by friction of the brush from being removed from the end of the slip ring cover. The apparatus is equipped with an intake fan that radiates air by centrifugal force on the inner circumferential side thereof, and is configured to collect brush powder collected on the inner circumference of the end of the slip ring cover at an exhaust port and filter it with a filter. Therefore, the brush powder generated from the brush is forcibly sucked into the end of the slip ring cover before it naturally falls and accumulates inside the slip ring cover, and concentrated by centrifugal force. The brush powder can be blown off and collected on the inner circumference of the cover, and therefore, the brush powder can be led out to the small discharge passage and outlet without remaining on the brush surface or slip ring due to scattered brush powder, and the filter installed in this area By filtration, it is possible to reliably collect all the brush powder.

Further, according to the invention of the second claim, there is provided a slip ring that is attached to the rotor shaft of a wire-wound motor and rotates while slidingly contacting the brushes to mutually supply power to the first rotor winding and the stator winding. a slip ring cover that surrounds the end of the rotor shaft including the slip ring and the brush; and a brush dust catcher provided at the bottom of the slip ring cover, and a brush dust catcher that falls into the brush dust catcher. Brush powder is forcibly sucked into the exhaust port side by a brush powder suction device, and the sucked brush powder is collected at the exhaust port and filtered by a filter. By the air suction force of the brush suction device, it is possible to forcibly discharge almost all the brush powder to the discharge passage after it falls or accumulates on the brush dust receiver. In this case, almost all the brush powder can be automatically and separated. Collect them using a filter,
This has the effect of producing something that can be easily recovered.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of a slip ring device according to an embodiment of the invention of claim 1, and FIG. 2 is a side cross-sectional view of the slip ring device of FIG.
3 is a partially cutaway front view showing a slip ring device according to an embodiment of the invention of the second claim; FIG. 4 is a side sectional view showing the slip ring device of FIG. 3 in longitudinal section;
FIG. 5 is a partially cutaway front view of a conventional slip ring device, and FIG. 6 is a longitudinal sectional side view of the slip ring device of FIG. 1 is a slip ring, 2 is a brush, 3.10 is a slip ring cover, 5 is an intake fan, 6 and 13 are filters,
7 is brush powder, 8 is rotor shaft, 11 is brush powder receiver, 1
2 is the brush powder suction device M0. In the figure 1, the same reference numerals are the same.
or a significant portion.

Claims (2)

[Claims] (1) A slip ring that is attached to the rotor shaft of a wire-wound electric motor and rotates while slidingly contacting the brushes to mutually supply power to the rotor windings and stator windings, and includes the slip ring and the brushes. A slip ring cover that surrounds the end of the rotor shaft, and a slip ring cover that is attached to the end of the rotor shaft, attracts brush powder caused by friction of the brush to the end of the slip ring cover, and applies centrifugal force to the inner circumference of the slip ring cover. A slip ring device comprising: an intake fan that emits air at the end of the slip ring; and a filter that collects and filters brush powder collected on the inner periphery of the end of the slip ring cover at an exhaust port. (2) A slip ring that is attached to the rotor shaft of a wire-wound motor and rotates while slidingly contacting the brushes to mutually supply power to the rotor windings and stator windings, and includes the slip ring and the brushes. A slip ring cover that surrounds the end of the rotor shaft, a brush powder receiver provided at the bottom of the slip ring cover, and a brush powder receiver that forcibly sucks brush powder that has fallen into the brush powder receiver toward the exhaust port side. A slip ring device comprising a brush powder suction device and a filter that collects and filters the brush powder sucked by the brush powder suction device at an exhaust port.