CN110663144A

CN110663144A - Brush block with dust collector for slip ring

Info

Publication number: CN110663144A
Application number: CN201880034303.1A
Authority: CN
Inventors: C·沃格尔
Original assignee: Shi Lai Fu Ling Co Ltd
Current assignee: Shi Lai Fu Ling Co Ltd; Schleifring GmbH
Priority date: 2017-05-26
Filing date: 2018-05-24
Publication date: 2020-01-07
Anticipated expiration: 2038-05-24
Also published as: CN110663144B; EP3407439A1; EP3407439B1; WO2018215602A1

Abstract

A dust collector for a slip ring, comprising a body made of an insulating material forming a concave collecting space, and further comprising at least one attachment member for attaching the dust collector to a brush block or a brush holder sleeve.

Description

Brush block with dust collector for slip ring

Technical Field

The present invention relates to a dust collector for a slip ring brush and a brush holder used in an electric power transmission device (e.g., a slip ring or a rotary joint), a slip ring brush and a brush holder having a dust collector, and a brush block for holding a brush having a dust collector.

Background

Slip rings are used to transmit power between rotating parts of a machine (e.g., a wind power plant, a CT scanner, or a generator). In which brushes, mainly composed of conductive material (e.g. carbon), slide on a rotating cylindrical track made of conductive material. A common material for such rails is steel or brass.

Us patent 8,829,761B2 discloses a brush block contained within a conduit. A forced airflow through the duct is generated by the fan and the dust particles are collected in the filter. This embodiment is relatively complex and expensive and is therefore preferably used in large brush blocks having a large number of brushes and containing a large total mass of carbon material.

Disclosure of Invention

The problem to be solved by the present invention is to provide a simple, cost-effective means for collecting dust and debris from a slip ring. Furthermore, maintenance should be easy and cost effective.

A solution to this problem is described in the independent claims. The dependent claims relate to further developments of the invention.

It is known from the prior art to have a central dust collecting device for a plurality of brushes. According to the present invention, dust is collected at each individual brush. This is more efficient and avoids contamination of other components by dust, as the dust is collected close to where it is generated. Due to the lower dust present in the slip ring assembly, in particular on the sliding rail, the minimum air gap and creepage distance between the rail and the brush holder for different potentials required by the relevant electrical safety standards is easier to maintain.

Generally, dust and debris (herein simply referred to as dust for simplicity) have a tendency to follow gravity and fall to the ground. There may be other forces (e.g., friction from a rotating drum) that accelerate the particles into the direction of rotation. The rotation may also create a more or less turbulent air flow which may drive the particles into the direction of rotation. Many long-term tests have shown that a considerable amount of particles still fall to the ground. Thus, the direction of dust particles passing through the brush is different between the positions. When in the side position, the particles come from one side, and the particles in the bottom position come from the top. At the top position, the particles fall directly onto the module and are not easily collected.

In an embodiment, a dust collector for a slip ring brush or a slip ring brush holder comprises a body which may be made of an insulating material (e.g. a plastic material). The dust collector forms at least one dust collecting space formed by the dust collecting edge portion. The dust collector may have at least one attachment member for attaching the dust collector to the brush block or brush holder sleeve. The edge portion of the dust collector may have a cylindrical or conical shape. Preferably, the dust collecting edge portion has a concave shape which simplifies retention of dust. The attachment member may be at least one clamp or a pair of clamps, preferably to clamp the dust collector to the brush holder, most preferably to clamp the dust collector to the sleeve of the brush holder.

The dust collector may have different embodiments. The first type may be for mounting at a bottom position of the slip ring assembly, having a circular collecting edge portion forming a collecting space, which preferably surrounds the brush holder, such that no dust can fall down along the dust holder.

Another type may be optimized for mounting at a side position of the slip ring assembly. Such a dust collector may have a concave side wall. The side wall may cover only a portion of the circumference of the brush holder, such as a 180 degree arc segment. The side wall may also cover the entire arc of a circle and thus have a hollow cylindrical shape. Preferably, the dust collector forms an open channel parallel to the brush holder, such that an air flow may pass along the channel.

Common types may include a circular side wall and a closed bottom, preferably located at the region of the clamp. This embodiment can be used at the bottom position, at the side positions and in the middle. The disadvantage is a slightly higher space consumption.

While it is preferred that the concave walls be substantially arcuate, an angular design with multiple corners will have the same effect and fall within the scope of the embodiments shown herein.

The dust collector made of plastic material may be manufactured by 3D printing or injection molding. Plastic dust collectors are very flexible in their use because they do not reduce the insulation between the parts. Alternatively, the dust collector may comprise a metal.

In an embodiment, the at least one dust collector is attached to the at least one brush holder for holding the brush.

In general, a plurality of dust collectors may be connected together or may even be made of one piece. This will simplify disassembly and assembly for replacement and cleaning of the dust collector. Most preferably, only the dust collectors of the brushes belonging to the same sliding track are held together. This increases the insulation between the individual tracks.

Preferably, the dust collector has ribs distributed over the dust collecting surface to prevent dust being sucked back. The rough surface of the dust collecting surface is also advantageous, especially when the dust collector is intended for disposable use.

For maintenance, the dust collector can simply be removed (unplugged) from the brush holder or brush block. They can be cleaned or replaced and reassembled again. The attachment of the dust collector to the brush holder or brush block may be by means of clamps, bayonet or screw threads (if removable), or by gluing, press fitting, casting or 3D printing (if permanently attached).

Basically, the term carbon brush relates to all kinds of brushes that contain at least a certain amount of carbon or graphite material. Such brushes typically have a substantially rectangular body shape rather than forming a wire, such as wire brushes which typically comprise metal.

Drawings

Hereinafter, without limiting the general inventive concept, the present invention will be described by way of examples of embodiments with reference to the accompanying drawings.

Fig. 1 shows a first dust collector for collecting dust from the sides.

Fig. 2 to 4 show further details of the first dust collector.

Fig. 5 shows a further embodiment of the dust collector.

Fig. 6 and 7 show further details of the dust collector.

Figure 6 shows a brush block.

Fig. 7 shows a second dust collector for collecting dust from the top.

Fig. 8 shows the brush holder fully assembled.

Figure 9 shows a portion of a brush block having two brush holders.

Figure 10 shows a slip ring assembly.

Detailed Description

In fig. 1 a first dust collector 500 is shown for a side position with respect to the slip ring. As described later, such a dust collector may be installed in a side position. The dust collector is preferably made of an insulating material, most preferably a plastic material. The dust collector has at least one retaining member, which may be a clip to retain the dust collector to the brush block or brush holder sleeve 300. Furthermore, the dust collector has a preferably concave wall 520 forming the collecting space 510. The dust collector may be attached to the brush block or brush holder sleeve such that the collection space is towards the sides and below the brush, and the collection space may be open to the top so that it can collect dust falling from the brush to the floor. Preferably, the collecting space is radially oriented with respect to the longitudinal axis of the brush, preferably covering an angle of up to 180 degrees. It may cover any other suitable angle, for example 360 degrees or any portion thereof. The dust collector 500 may have at least one

clamp

540, 541 for holding the dust collector to the brush holder sleeve. The sleeve may have a slot 330 for interfacing with a clip. The slot may allow to hold the clamp and thus the dust collector in a stable and well defined position for a long time. The clip may be retained by the spacer 550 to allow a greater distance of the wall 520 to the brush holder sleeve, which allows for a certain air flow to achieve cooling and greater collection capacity of the brush holder.

Fig. 2 shows a cross-sectional side view of the dust collector in fig. 1.

Fig. 3 shows a similar side view, but rotated about 90 degrees on the vertical axis. Here also shown are ribs 530 which act as dust traps to prevent dust being sucked back. Furthermore, the ribs may help to improve the stability of the dust collector.

Fig. 4 shows a top view of a dust collector with a curved wall 520 forming a collecting space. Here, a ring clamp is shown having two

flexible end portions

540 and 541 which can interface with the retaining groove of the brush holder sleeve. The clip may also be used without a retaining groove.

In fig. 5, another embodiment of a dust collector 400 for a bottom position relative to the slip ring is shown. The dust collector has a rim portion 410 for collecting dust from the top side. The edge portion of the dust collector may have a cylindrical or conical shape. The dust collector is preferably made of an insulating material, most preferably a plastic material. The dust collector has at least one retaining member which may be a

clip

440, 441 to retain the dust collector to the brush block or brush holder sleeve. The sleeve may have a slot 330 for interfacing with a clip. Furthermore, the dust collector preferably has an annular wall 420 forming a collecting space by a rim portion 410, which may be substantially concave. The side wall 430 may match the outer contour of the sleeve and help secure the dust collector to the sleeve. Preferably, the side wall closely surrounds the sleeve so that no dust can slip between the sleeve and the dust collector. The dust collector may be attached to the brush block or brush holder sleeve 300 such that the collection space is located below the brush and open to the top, and may collect dust falling from the brush to the ground. Preferably, the collection space is axially oriented with respect to the longitudinal axis of the brush. Here, the brush may be located within the interior space of the brush holder sleeve 310. The sliding track is above the top of the sleeve. Threads 320 may be provided for retaining the locking cap.

Fig. 6 shows a cross-sectional side view of the dust collector in fig. 5.

Fig. 7 shows a similar side view, but rotated about 90 degrees on the vertical axis of the figure. Here, a ring clamp is shown having two

flexible end portions

440 and 441 that can interface with the retaining groove of the brush holder sleeve. The clip may also be used without a retaining groove.

In fig. 8, the fully assembled brush holder is shown in a sectional view. Here, the carbon brush 360 is held in the brush holder sleeve 300. Preferably, the carbon brush 360 has a rectangular cross section. The inner space 310 of the sleeve is adapted to the carbon brush and therefore preferably also has a rectangular cross section. The spring 350 presses the carbon brush out of the sleeve towards the sliding track. A locking cap 340 retains the spring and brush within the sleeve. To replace the brush, the locking cap may be unscrewed and removed. The brush block base 610 may provide a means for holding the sleeve 300 with brushes, dust collectors, and other components. The dust collector may also be attached directly to the brush block base, for example by a retaining pin.

Figure 9 shows a portion of a brush block having two brush holders held by a common block base 610.

In fig. 10, a slip ring module 100 having a sliding track is shown, the slip ring module having a drum shape. The slip ring module rotates about axis 101 in a clockwise direction as indicated by arrow 102. Basically, the brushes and brush blocks can be arranged at any position. Here, four different positions are exemplarily shown. There are two

side positions

201 and 203, a top position 204 and a bottom position 202.

List of reference numerals

100 slip ring module

101 axis of rotation

102 direction of rotation

201 right side position

202 bottom position

203 left side position

204 top position

300 brush holder sleeve

310 inner space of sleeve

320 threads for locking caps

330 holding groove

340 locking cover

350 spring

360 carbon brush

400 dust collector for bottom position

410 dust collecting edge portion

420 annular wall

430 side wall

440. 441 holding jig

500 dust collector for side position

510 collecting space

520 concave wall

530 Rib

540. 541 holding clamp

550 shim

610 brush block base

Claims

1. A dust collector (400, 500) for a slip ring, the dust collector comprising a body made of an insulating material forming a collecting space (410, 510), and further comprising at least one attachment member (440, 441, 540, 541) for attaching the dust collector to a brush holder sleeve.

2. The dust collector of claim 1,

the collection space (410, 510) has a concave shape.

3. The dust collector according to claim 1 or 2,

the collecting space is formed by a concave wall (520).

4. The dust collector of claim 3,

the concave wall (520) forms a channel with a brush holder sleeve.

5. The dust collector according to claim 1 or 2,

the collecting space having a cylindrical or conical shape is formed by the dust collecting edge portion (410).

6. The dust collector according to any of the preceding claims,

the at least one attachment member (440, 441, 540, 541) comprises a clamp, preferably a pair of clamps, most preferably to clamp the dust collector to a brush holder, and most preferably to a sleeve of a brush holder.

7. The dust collector according to any of the preceding claims,

the dust collector comprises a plastic material.

8. The dust collector according to any of the preceding claims,

the collecting space comprises ribs preventing dust from being sucked back.

9. A brush holder comprising a cylindrical tubular sleeve (300) holding a dust collector according to any one of the preceding claims.

10. A brush holder according to claim 9, having a holding slot (330) for a holding clamp (440, 441, 540, 541) of the dust collector.

11. A slip ring brush block comprising at least one brush holder according to claim 9 or 10, said brush holder being held by a brush block base 610.

12. Slip ring comprising a sliding track and a slip ring brush block according to the preceding claims.