Offline Dust Removal Device and Usage Method for Generator Slip Rings

Abstract

The present invention relates to the field of hydropower generators, and the purpose is to provide an off-line dust removal device for the slip rings of generators. The present invention includes a driving device, a supporting device, a dust removal device and a power supply control unit. The driving device includes a motor, a gear set, an aluminum seat and a rotating arm. The rotating arm is connected to the motor through the gear set. The supporting device includes a support frame. One end of the support frame is connected to the aluminum seat, and the other end of the support frame is floatingly connected to the slip ring. The dust removal device includes a vacuum cleaner, a suction pipe and a brush. The housing of the vacuum cleaner is connected to the rotating arm. The output end of the vacuum cleaner is communicated with the suction pipe. Both the suction pipe and the brush are connected to the rotating arm. The power supply control unit includes a control box. The control box is connected to the suction box through a cable. The structure of the present invention is reasonable, has strong practicability and is suitable for popularization.

Description

Technical Field

[0001] The present invention relates to the field of collector rings of hydropower generators, and particularly to an offline dust removal device for collector rings of generators and a usage method thereof. Background Art

[0002] During the operation of a hydropower generator, carbon powder is generated due to the friction between the carbon brush and the collector ring. Although there is an on-line carbon powder suction device, it cannot ensure complete suction of the carbon powder. The remaining carbon powder will accumulate on the surface of the collector ring and the inner surface of the dust suction cover. After long-term accumulation, it may cause partial discharge and ultimately lead to a burning accident. To prevent accidents caused by carbon powder problems, it is necessary to regularly clean the carbon powder on the inner surfaces of the collector ring and the dust suction cover. The traditional cleaning of the generator collector ring and the carbon powder dust suction cover is carried out by manual cleaning after removing the current collection device during the generator maintenance state, which has the problems of low cleaning efficiency and unsatisfactory cleaning effect.

[0003] CN201611143675.7, Collector Ring Device and Wind Turbine Generator. This invention provides a collector ring device and a wind turbine generator. The device includes a slip ring arranged on the rotating shaft of the generator, a carbon brush cooperating with the slip ring, a housing, and a dust removal mechanism. The housing covers the outside of the generator rotating shaft, the slip ring, the carbon brush, and the dust removal mechanism, and is provided with an air inlet and a dust discharge chamber. The dust removal mechanism is coaxially arranged with the generator rotating shaft and communicates with the dust discharge chamber to extract the carbon powder generated by the carbon brush into the dust discharge chamber. The collector ring device provided by the present invention has the housing covering the outside of the generator rotating shaft, the slip ring, the carbon brush, and the dust removal mechanism, and is provided with an air inlet and a dust discharge chamber. The dust removal mechanism is coaxially arranged with the generator rotating shaft and communicates with the dust discharge chamber to extract the carbon powder generated by the carbon brush into the dust discharge chamber, thereby discharging the accumulated carbon powder, effectively reducing carbon powder accumulation, avoiding carbon brush blockage faults, reducing the failure rate of the product, thus reducing the maintenance cost, and being beneficial to the market competitiveness of the product. However, the dust removal mechanism mainly adsorbs dust through the centrifugal motion of the rotating shaft, and the adsorption ability is not strong, easily causing carbon powder residue.

[0004] Therefore, a usage method for an offline dust removal device of a generator collector ring is needed, which can automatically suck carbon powder, can clean the carbon powder without removing the current collection device, and is suitable for current collectors of different sizes and specifications. Summary of the Invention

[0005] The purpose of the present invention is to provide an offline dust removal device for a generator collector ring and a usage method thereof. By driving a special brush head and a dust suction pipe to rotate slowly with a rotating arm, cyclic cleaning and dust removal are realized for the grooves of the collector ring and the positions on the inner surface of the dust suction cover that are not easily cleaned, which can efficiently clean the carbon powder remaining and accumulating on the grooves of the collector ring and the inner surface of the dust suction cover, thereby greatly reducing the possible discharge phenomenon during the operation of the generator and improving the operation stability of the generator set. The structure of the present invention is reasonable, the design is ingenious, and it is suitable for popularization.

[0006] The technical solution adopted by the present invention is: an off-line dust removal device for a generator slip ring, which includes a driving device, a supporting device, a dust removal device and a power supply control unit. The driving device includes a motor, a gear set, an aluminum seat and a rotating arm. The rotating arm is connected to the motor through the gear set. The supporting device includes a support frame. One end of the support frame is connected to the aluminum seat, and the other end of the support frame is floatingly connected to the slip ring. The dust removal device includes a vacuum cleaner, a suction pipe and a brush. The housing of the vacuum cleaner is connected to the rotating arm. The output end of the vacuum cleaner is communicated with the suction pipe. Both the suction pipe and the brush are connected to the rotating arm. The power supply control unit includes a control box, and the control box is connected to the suction box through a cable.

[0007] By the above technical means, the off-line dust removal device for the generator collector device uses the rotating arm to drive the special brush head and the suction pipe to rotate slowly to realize the cyclic cleaning and dust removal of the positions that are not easy to clean on the inner surface of the slip ring groove and the suction cover, and can efficiently clean the carbon powder remaining and accumulating on the inner surface of the slip ring groove and the suction cover, thereby greatly reducing the possible discharge phenomenon during the operation of the generator and improving the operation stability of the generator set. The structure of the present invention is reasonable, the design is ingenious, and it is suitable for popularization.

[0008] Preferably, the support frame includes an octagonal frame and eight adjustable lead screws. The lead screws are connected to the octagonal frame, and the center of gravity of the octagonal frame coincides with the center of the slip ring of the generator.

[0009] Preferably, the gear set includes a driving gear and a driven gear. The output shaft of the driving motor is connected to the driving gear. The driving gear meshes with the driven gear, and the support seat of the driven gear is connected to the aluminum seat.

[0010] Preferably, a dust removal cover is provided at one end of the support frame away from the gear set. One end of the brush abuts against the slip ring, and the other end of the brush abuts against the dust removal cover.

[0011] Preferably, the dust suction device further includes a dust suction support frame and a pipe clamp. The suction pipe is movably connected to the dust suction support frame through the pipe clamp, and the brush is arranged at the bottom of the dust suction support frame.

[0012] Preferably, the brush is movably connected to the dust suction support frame, and the suction pipe is symmetrically arranged on both sides of the brush with the brush as the symmetry center.

[0013] The usage method of the off-line dust removal device for the generator slip ring includes the off-line dust removal device for the generator slip ring described above. The usage method includes the following steps:

[0014] Step 1: Obtain the dimensional data of the slip rings of the generator so that the support frame is used to bear the weight of the dust removal device;

[0015] Step 2: Adjust the adjusting screw rod on the support device according to the dimensional data to achieve concentric setting of the dust removal device and the slip rings of the generator. Among them, the rotating arms are symmetrically and fixedly arranged on the gear set;

[0016] Step 3: By starting the control box, the motor drives the rotating arms to rotate, and the vacuum cleaner works to adsorb the carbon powder in the slip rings through the suction pipe.

[0017] Preferably, in Step 3, the suction pipe and the brush are adjusted through the suction support bracket to extend into the slip rings so that the suction pipe and the brush are kept horizontal with the plane where the slip rings are located.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. The screw rod aluminum seat can be adjusted, which is applicable to generators of different sizes;

[0020] 2. The length of the brush can be adjusted, which is applicable to slip rings of different models. By selecting a vacuum cleaner, the ability to adsorb carbon powder is strong;

[0021] 3. It rotates following the gear and continuously adsorbs carbon powder. Description of the Drawings

[0022] Figure 1 It is the top view of the dust removal device in an embodiment of the present invention;

[0023] Figure 2 It is the front view of the dust removal device in an embodiment of the present invention;

[0024] Figure 3 It is the structural diagram of the suction pipe in an embodiment of the present invention;

[0025] Figure 4 It is the structural diagram of the brush in an embodiment of the present invention. Detailed Embodiments

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the attached drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts. Figures 1 to 4

[0027] ​In the description of the present invention, it should be understood that the orientation or positional relationships indicated by terms such as "counterclockwise", "clockwise", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0028] Embodiment 1:

[0029] An off-line dust removal device for a generator slip ring, comprising a driving device, a supporting device, a dust removal device and a power supply control unit. The driving device includes a motor, a gear set, an aluminum seat and a rotating arm. The rotating arm is connected to the motor through the gear set. The supporting device includes a support frame. One end of the support frame is connected to the aluminum seat, and the other end of the support frame is floatingly connected to the slip ring. The dust removal device includes a vacuum cleaner, a suction pipe and a brush. The housing of the vacuum cleaner is connected to the rotating arm. The output end of the vacuum cleaner is communicated with the suction pipe. Both the suction pipe and the brush are connected to the rotating arm. The power supply control unit includes a control box, and the control box is connected to the suction box through a cable.

[0030] The power supply control unit further includes a slip ring, a carbon brush and a brush holder. One end of the carbon brush is fixedly connected to the brush holder, and the other end of the carbon brush abuts against the slip ring. The slip ring is connected to the aluminum seat. The brush holder is connected to the gear set. The support frame includes an octagonal frame and a plurality of adjustable lead screws. The lead screws are connected to the octagonal frame. The center of gravity of the octagonal frame coincides with the center of the slip ring of the generator. The gear set includes a driving gear and a driven gear. The output shaft of the driving motor is connected to the driving gear. The driving gear meshes with the driven gear. The support seat of the driven gear is connected to the aluminum seat. A lubricating oil groove is also provided on the aluminum seat. A dust removal cover is provided at one end of the support frame away from the gear set. One end of the brush abuts against the slip ring, and the other end of the brush abuts against the dust removal cover. The dust suction device further includes a dust suction support and a pipe clamp. The suction pipe is movably connected to the dust suction support through the pipe clamp. The brush is arranged at the bottom of the dust suction support, and the brush is movably connected to the dust suction support. The suction pipe is symmetrically arranged on both sides of the brush with the brush as the symmetry center.

[0031] Embodiment 2:

[0032] A method for using an off-line dust removal device for a generator slip ring, the method comprising the following steps:

[0033] Step 1: Obtain the dimensional data of the slip rings of the generator. The support device is used to bear the weight of the dust removal device.

[0034] Step 2: Adjust the adjusting screw rod on the support device according to the dimensional data to make the dust removal device concentric with the slip rings of the generator. Among them, the rotating arms are symmetrically and fixedly arranged on the gear set.

[0035] Step 3: By starting the control box, the motor drives the rotating arms to rotate, and the vacuum cleaner works. Carbon powder in the slip rings is adsorbed through the suction pipe. In Step 3, the suction pipe and the brush are adjusted through the suction support bracket to extend into the slip rings, so that the suction pipe and the brush are kept horizontal with the plane where the slip rings are located.

[0036] Table 1 shows the description of the corresponding component drawing reference numerals in the off-line dust removal device for the slip rings of the generator:

[0037] Table 1

[0038]

[0039] It should be noted that please refer to Figure 1 , the JDIA electromagnetic speed control motor controller is used for the speed control of the electromagnetic speed control motor to achieve constant torque stepless speed regulation. The aluminum seat, gears, slip rings, brackets, etc. are all designed in split form, which is convenient for installation and reduces the device size. The QABP80M6B type variable frequency speed regulation three-phase asynchronous motor is selected, and the external dimensions are: L = 364mm AC = 165mm HE = 200mm; weight 20kg; 6P 0.55kW, a micro vacuum cleaner, the fan model is QA15050 (AC220V), the fan size: 150×150×50, the filter bag is ZJQ3010958, the large gear: the number of teeth is 158, the module: M = 6, the addendum coefficient is 1.0, the dedendum coefficient is 1.25, the pressure angle is 20°, the material is Q235B, the diameter is 960mm, and it is assembled in two halves. The small gear: the number of teeth is 20, the module: M = 6, the addendum coefficient is 1.0, the dedendum coefficient is 1.25, the pressure angle is 20°, the material is Q235B, the diameter is 132mm.

[0040] It should be noted that please refer to Figure 2, the support frame is made of aluminum profile (40×80 - 5) for load bearing, and special corner fittings are used at the connections of the brackets. The support adjustment unit consists of high-strength aluminum alloy assemblies and eight screw rods. The aluminum alloy main beam can bear the weight of the device, and the octagonal support beams form an overall framework. Its characteristic lies in that the horizontal position of the support unit can be finely adjusted through eight screw rods to achieve concentricity between the dust removal device and the slip ring. The power control and transmission unit consists of a controller, carbon brushes, and a slip ring. Its characteristic lies in that the slip ring transmits electrical energy from the fixed part to the rotating part, and stepless speed change and bidirectional rotation control are achieved through the controller. The control box is installed independently and suspended at the crossbeam of the top cover of the generator. The control unit is connected to the controlled equipment and the external power supply by means of aviation plugs, and the aviation plugs can achieve rapid docking of the electrical circuit. The slip ring group consists of 2 sets of slip rings, carbon brushes, and brush holders each, and can conduct power commutation. Its characteristic lies in that it can not only transmit electrical energy from the fixed part to the rotating part, but also achieve clockwise and counterclockwise rotation of the rotating arm. There are 2 sets of rotating arms, which are symmetrically and fixedly installed on the transmission gear. The rotating arm is provided with adjustment holes, and the length of the rotating arm can be adjusted. The adjustment range is 66 mm, which can be applicable to slip ring devices with different diameters; the rotating arm and the double-sided brush are connected in an L shape, and the L-shaped connection is provided with adjustment holes, which cooperate with the brush adjustment holes to achieve up and down adjustment of the brush. The adjustment range is 44 mm.

[0041] It should be noted that, please refer to Figure 3 , the dust removal unit consists of two sets of mini vacuum cleaners (each set has 2 suction pipes) and 2 sets of double-sided brushes. The gap between the generator slip ring and the dust removal cover is 6 mm. The surface of the slip ring is provided with spiral grooves, and it is easy for carbon powder to accumulate in the grooves during the operation of the generator, and the carbon powder is fine and has a certain adsorption capacity. According to the above characteristics, double-sided brushes and double-channel suction pipes are designed in this embodiment for cleaning and dust removal of the slip ring and the dust collection cover. Please refer to Figure 4 , the mini vacuum cleaners and the double-sided brushes are installed on the rotating arm. The fixing of the brush and the rotating arm adopts adjustable bolt holes to achieve up and down adjustment and quick replacement of the double-sided brush. The working characteristic of the dust removal unit is that the rotation of the variable-frequency motor drives the brushes and suction pipes on the rotating arm to work, realizing the cleaning and collection of the dust in the grooves of the slip ring and the dust suction cover, improving the cleaning work efficiency and avoiding secondary pollution.

[0042] It should be noted that, in order to reduce the impact on the generator slip ring device and improve the applicable range of the scheme. The scheme is designed with a frame split structure, and at the same time, adjustable holes are adopted between various structural parts and modules to be applicable to generator slip ring devices of different sizes. The depth adjustment range of the brush is 44 mm, and the adjustment range of the support arm is 66 mm. To reduce the working intensity of personnel and ensure the stability of the device at the same time, a large area of aluminum alloy material is used in this scheme, and the maximum single-piece weight is not more than 22 kg, which is convenient for the handling and installation of the device.

[0043] In summary, the implementation principle of the present invention is as follows: According to the structure of the generator slip ring and the characteristics of carbon powder, a dust removal device is designed. The frequency conversion motor is used to drive the gear set to drive the brush on the rotating arm to rotate slowly, so as to sweep the dust adsorbed on the surface and grooves of the slip ring, and the dust is sucked out through the suction pipe of the vacuum cleaner. The structure of the present invention is reasonable and the design is ingenious, which is suitable for popularization.

Claims

1. Offline dust removal device for generator slip rings, characterized in that, It includes a driving device, a supporting device, a dust removal unit and a power control unit. The driving device includes a motor, a gear set, an aluminum seat and a rotating arm. The rotating arm is connected to the motor through the gear set. The supporting device includes a support frame. One end of the support frame is connected to the aluminum seat, and the other end of the support frame is floatingly connected to the slip ring. The dust removal unit includes a vacuum cleaner, a suction pipe and a brush. The housing of the vacuum cleaner is connected to the rotating arm. The output end of the vacuum cleaner is communicated with the suction pipe. Both the suction pipe and the brush are connected to the rotating arm. The power control unit includes a control box. The control box is connected to the suction box through a cable; The support frame includes an octagonal frame and eight adjustable screw rods. The screw rods are connected to the octagonal frame. The center of gravity of the octagonal frame coincides with the center of the slip ring of the generator; The gear set includes a driving gear and a driven gear. The output shaft of the motor is connected to the driving gear. The driving gear meshes with the driven gear. The support seat of the driven gear is connected to the aluminum seat; A dust removal cover is provided at one end of the support frame away from the gear set. One end of the brush abuts against the slip ring, and the other end of the brush abuts against the dust removal cover; The dust removal unit further includes a suction support and a pipe clamp. The suction pipe is movably connected to the suction support through the pipe clamp. The brush is arranged at the bottom of the suction support; The brush is movably connected to the suction support. The suction pipes are symmetrically arranged on both sides of the brush with the brush as the symmetry center.

2. Method for using the off-line dust removal device for the generator slip ring, applying the off-line dust removal device for the generator slip ring according to claim 1, characterized in that, The usage method includes the following steps: Step 1: Obtain the size data of the slip ring of the generator. The supporting device is used to bear the weight of the dust removal device; Step 2: Adjust the adjusting screw rod on the supporting device according to the size data to make the dust removal device concentric with the slip ring of the generator. Among them, the rotating arms are symmetrically and fixedly arranged on the gear set; Step 3: By starting the control box, the motor drives the rotating arm to rotate, and the vacuum cleaner works to adsorb the carbon powder in the slip ring through the suction pipe; In Step 3, the suction pipe and the brush are adjusted to extend into the slip ring through the suction support, so that the suction pipe and the brush are kept horizontal with the plane where the slip ring is located.

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