Centrifugal dust removal device for carbon powder recovery of variable speed unit

Abstract

The invention discloses a centrifugal dust removal device for carbon powder recovery of a variable-speed unit, and belongs to the field of variable-speed units. The dust collection device consists of a fan supporting plate, a centrifugal fan, an insulating washer, a dust collection device cover plate, a dust collection device fixing plate and a breathable carbon powder filter felt. The centrifugal dust removal device recovers carbon powder generated by friction between a collecting ring and a carbon brush through centrifugal force generated by rotation of the variable speed unit, and the good internal operation environment of the unit can be guaranteed. Compared with a traditional carbon powder dust removal cabinet body, the overall structure size is greatly reduced, so that the interior of the unit top cover is wider, and a more comfortable operation space is provided for maintenance personnel; the risk of short-circuit accidents possibly caused by carbon powder aggregation is reduced, and safe and stable operation of a unit is ensured; each part structure adopts a mechanical locking mode, so that the disassembly and assembly are convenient, and the maintenance efficiency of subsequent maintenance personnel is improved; modularized design can be carried out, and wide engineering application and popularization value is achieved.

Description

Technical Field

[0001] This invention relates to a centrifugal dust collector for carbon recovery in variable speed generator sets, belonging to the field of variable speed generator sets. Background Technology

[0002] In building a new power system dominated by new energy sources, variable-speed generators, with their core technologies, have broken through the operational limitations of traditional fixed-speed generators, becoming key equipment for enhancing the flexibility and security of the power grid. Through an advanced AC excitation system, they achieve continuous and smooth speed regulation. This allows them to flexibly absorb fluctuating new energy sources like a "precise pump" during pumping operations, and maintain high efficiency during power generation, thus becoming a powerful tool for fine-tuning grid frequency. More importantly, these generators possess a fast-response "power buffer" capability, capable of instantaneously and significantly processing active power to stabilize grid frequency, and independently adjusting reactive power to provide voltage support, thereby comprehensively enhancing the transient stability and anti-disturbance capabilities of the power grid.

[0003] Furthermore, variable-speed generators demonstrate exceptional engineering adaptability and techno-economic efficiency. They can accommodate a wider range of head and flow variations, broadening the applicability of power plants, and effectively mitigating cavitation and cavitation by optimizing operating flow patterns, thereby improving the reliability and service life of key equipment. Therefore, variable-speed generators have evolved into core assets of intelligent power grids, integrating flexible regulation, active support, and safe stability, possessing irreplaceable strategic value for the reliable integration of high-proportion renewable energy sources and the construction of new power systems.

[0004] When a variable speed generator set is running, the friction between the slip rings and carbon brushes generates carbon dust. Prolonged accumulation of carbon dust on the surfaces of electrically conductive components such as rotor leads may pose a short-circuit risk and also affects aesthetics. Currently, the most common carbon dust removal devices are suction-type, requiring an external power supply. These devices have large cabinets, resulting in limited internal space, making it inconvenient for maintenance personnel to work inside, and they also generate significant noise, negatively impacting plant operations.

[0005] Therefore, there is an urgent need to propose a centrifugal dust removal device for carbon recovery in variable speed units to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a centrifugal dust collector for carbon powder recovery in variable speed generator sets, which is efficient in collecting carbon powder, small in size, noiseless, and easy to assemble and disassemble. This solves the problems of carbon powder generation on carbon brushes easily causing short circuits during variable speed generator operation, and the large size, high noise, and inconvenient maintenance of traditional externally powered dust collectors. A brief overview of the invention is provided below to offer a basic understanding of certain aspects of it. It should be understood that this overview is not an exhaustive summary of the invention. It is not intended to identify key or essential parts of the invention, nor is it intended to limit the scope of the invention.

[0007] The technical solution of this invention:

[0008] A centrifugal dust collector for toner recovery in a variable speed generator set includes a fan support plate, a centrifugal fan, an insulating gasket, a dust collection device cover plate, a dust collection device fixing plate, and a breathable toner filter felt. The fan support plate is fixedly installed on the top of the main shaft of the variable speed generator set, and the centrifugal fan is installed on the fan support plate and rotates therewith. The dust collection device fixing plate is connected to the vertical rib of the top cover of the variable speed generator set, and the dust collection device cover plate is detachably installed on the dust collection device fixing plate. The insulating gasket is disposed between the dust collection device cover plate and the rotating centrifugal fan. The breathable toner filter felt is installed on the outer wall of the top cover of the variable speed generator set and is located in the airflow path guided by the rotation of the centrifugal fan to collect toner.

[0009] Preferably, the fan support plate is made of Q355B steel plate and is circular in shape. Its lower inner circle has a stop for engaging with the main shaft of the variable speed unit, and its upper outer circle has a stop for engaging with the centrifugal fan. The fan support plate also has multiple first threaded holes on its inner circle and multiple second threaded holes on its outer circle. Preferably, the fan support plate is connected and fixed to the main shaft and the centrifugal fan using high-strength bolt assemblies.

[0010] Preferably, the centrifugal fan is made of Q355B steel plate and is circular in shape. It consists of an upper steel plate, a lower steel plate, and multiple intermediate blades welded between the two. The lower steel plate has a stop that mates with the fan support plate on its inner circular side and is provided with multiple mounting holes.

[0011] Preferably, the insulating gasket is made of epoxy insulating material with an insulation class of F; the insulating gasket is fan-shaped and has multiple gaskets arranged along the circumference, with a gap between its inner circle and the outer circle of the centrifugal fan, and is fixed to the inner side of the dust collection device cover plate by a connector.

[0012] Preferably, the dust collection device cover is made of Q235B steel plate, and is fan-shaped with multiple covers arranged along the circumference. Each dust collection device cover has a handle on the top, light holes for connection on both sides, and threaded holes on the inner circle side.

[0013] Preferably, the dust collection device fixing plate is made of Q355B steel plate and has an overall I-shaped structure. It is assembled by welding the upper joint plate, vertical ribs, transition plate, fixing plate and lower joint plate, and is connected to the dust collection device cover plate by bolts.

[0014] Preferably, the breathable carbon powder filter felt is rectangular in shape, and multiple pieces are arranged along the circumference of the outer wall of the top cover; the filter felt is clamped by a stainless steel clamp plate bent to the same arc as the outer wall of the top cover, and is fixed to the outer wall of the variable speed unit top cover by bolts.

[0015] Preferably, the stainless steel clamp has a central ventilation rectangular hole and multiple mounting holes along its edges for mounting bolts to be inserted for fixation.

[0016] The present invention has the following beneficial effects:

[0017] 1. This invention breaks with the traditional design concept of vacuum-type toner dust collectors, replacing the toner dust collector cabinet and related control system with mechanical components, thus solving the problem of high noise levels in traditional toner dust collectors. Through the airflow generated by the rotation of the variable-speed unit's rotating components and the centrifugal force of the toner itself, the toner is adsorbed onto the surface of the breathable toner filter felt, achieving dust removal and preventing short-circuit accidents caused by toner accumulation. It also improves the internal operating environment, providing effective protection for the safe and stable operation of the unit.

[0018] 2. In this invention, a centrifugal fan is installed above the rotating component. The rotation of the rotating component generates a certain air volume, which improves the air cooling effect. This can effectively suppress the temperature rise inside the top cover, avoid the hidden dangers caused by carbon brush overheating, and extend the service life of carbon brushes and slip rings.

[0019] 3. This invention simplifies the structure of the dust collection device. A detachable cover is installed on top of the dust collection device, and the main components are fixed by mechanical locking, making disassembly and assembly convenient and facilitating subsequent inspection and maintenance work. At the same time, the breathable carbon powder filter felt is easy to replace and clean, and can be reused. Maintenance personnel do not need to enter the top cover during inspection and replacement, ensuring their safety.

[0020] 4. This invention is applicable to large pumped storage variable speed units of different capacities and sizes. This invention can be modularly designed. The radial dimensions of the fan support plate and the centrifugal fan can be adjusted according to the dimensions of the rotating parts and the actual space inside the top cover. The number of fan blades of the centrifugal fan can also be adjusted according to the actual speed of the unit to achieve better dust removal effect. This invention has a flexible structure and has wide engineering application and promotion value. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of a centrifugal dust collector used for carbon powder recovery in variable speed units;

[0022] Figure 2 This is a top view of a centrifugal dust collector used for carbon powder recovery in variable speed units;

[0023] Figure 3 This is a cross-sectional view of the fan support plate structure of a centrifugal dust collector used for carbon powder recovery in a variable speed unit;

[0024] Figure 4 This is a cross-sectional view of a centrifugal fan structure in a centrifugal dust collector used for carbon powder recovery in a variable speed unit.

[0025] Figure 5 This is a cross-sectional view of the dust collection device cover and dust collection device fixing plate structure of a centrifugal dust collector for carbon powder recovery in a variable speed unit;

[0026] Figure 6 This is a top view of the dust collection device cover and dust collection device fixing plate structure of a centrifugal dust collector for carbon powder recovery in a variable speed unit.

[0027] In the diagram: 1-Fan support plate; 2-Rotating part fixing bolt; 3-Centrifugal fan; 4-Insulating washer; 5-Fixing part clamping bolt; 6-Dust collection device cover plate; 7-Dust collection device fixing plate; 8-Breathable carbon powder filter felt; 9-Lodillac self-locking washer; 10-Stop washer; 11-Connecting bolt; 12-Plate; 13-Upper steel plate; 14-Lower steel plate; 15-Intermediate fan blade; 16-Handle; 17-Upper joint plate; 18-Vertical rib; 19-Transition plate; 20-Fixing plate; 21-Lower joint plate; 22-Fixing bolt; 23-Stainless steel clamping plate; 24-Mounting bolt; 25-Variable speed unit main shaft; 26-Variable speed unit top cover. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0029] Specific implementation method one: Combining Figures 1-6 This embodiment describes a centrifugal dust collector for carbon recovery in a variable speed unit, comprising a fan support plate 1, rotating part fixing bolts 2, a centrifugal fan 3, insulating washers 4, fixing part clamping bolts 5, dust collection device cover plate 6, dust collection device fixing plate 7, a breathable carbon filter felt assembly 8, Lodillac self-locking washers 9, stop washers 10, connecting bolts 11, pads 12, upper steel plate 13, lower steel plate 14, intermediate fan blades 15, handle 16, upper joint plate 17, vertical ribs 18, transition plate 19, fixing plate 20, lower joint plate 21, fixing bolts 22, stainless steel clamping plate 23, mounting bolts 24, variable speed unit main shaft 25, and variable speed unit top cover 26.

[0030] The fan support plate 1 is fixed to the top of the variable speed unit main shaft 25 by rotating bolts 2, and is locked with a Lodilock self-locking washer 9 to prevent loosening. The centrifugal fan 3 is mounted on the fan support plate 1. Specifically, the fan support plate 1 and the lower steel plate 14 of the centrifugal fan 3 are joined together by the same or another set of rotating bolts 2, and locked with a locking washer 10 to ensure reliability under high-speed rotation. The centrifugal fan 3 is composed of an upper steel plate 13, a lower steel plate 14, and twenty intermediate blades 15 welded between them.

[0031] A dust collection device fixing plate 7 is provided around the periphery of the rotating component. This fixing plate is firmly connected to the vertical ribs of the variable speed unit top cover 26 by welding. The dust collection device cover plate 6 is fastened to the upper joint plate 17 of the dust collection device fixing plate 7 by fixing bolts 5. On the inner circular side of the upper plane of the dust collection device cover plate 6, the insulating washer 4 is fastened to the pad 12 by connecting bolts 11. An insulating washer 4 maintains a gap of about 5 mm between its inner circle and the outer circle of the rotating centrifugal fan 3, which plays a crucial role in electrical insulation and safety isolation.

[0032] The dust collection device fixing plate 7 is generally H-shaped and is composed of an upper joint plate 17, vertical ribs 18, transition plate 19, fixing plate 20, and a lower joint plate 21 welded together. The upper joint plate 17 is a rectangular steel plate with 5 M12 threaded holes on each side; the lower joint plate 21 is a rectangular steel plate with 5 M12 threaded holes on each side; the transition plate 19 and the fixing plate 20 are joined together by fixing bolts 22 to form a stable support structure.

[0033] The breathable toner filter felt 8 is installed on the outer wall of the top cover 26 of the variable speed unit. The filter felt 8 is clamped by a stainless steel clamping plate 23 bent to the same arc as the outer wall of the top cover, and fixed to the outer wall of the top cover 26 by mounting bolts 24. The stainless steel clamping plate 23 has a ventilation rectangular hole machined in the center to allow airflow and retain toner on the surface of the filter felt.

[0034] The fan support plate 1 is made of Q355B steel plate and is circular in shape. The inner circle of its lower plane is machined with a stop that mates with the main shaft 25, and the outer circle of its upper plane is machined with a stop that mates with the centrifugal fan 3. The fan support plate 1 has 24 M16 threaded holes machined on the inner circle and 20 M16 threaded holes machined on the outer circle.

[0035] Both the rotating part engagement bolt 2 and the fixed part engagement bolt 5 are GB / T 5783-2000 series bolts with a strength grade of 8.8.

[0036] The insulating gasket 4 is made of F-grade epoxy insulating material, and is fan-shaped with eight pieces arranged in the circumferential direction.

[0037] The dust collection device cover plate 6 is made of Q235B steel plate, and is fan-shaped with eight sections in total. Two handles 16 are welded to the top for easy disassembly and assembly. The outer circumference of the insulating gasket has eight φ10 holes machined.

[0038] The centrifugal fan 3 is made of Q355B steel plate and is circular in shape. The centrifugal fan 3 is composed of an upper steel plate, a lower steel plate and middle blades welded together. The lower steel plate has a stop that matches the fan support plate on the inner circular side of the lower plane. The lower steel plate has 20 M16 holes on the inner circular side. There are a total of 20 middle blades.

[0039] The working principle of this invention is as follows: When the variable speed unit is running, the main shaft 25 drives the fan support plate 1 and the centrifugal fan 3 to rotate together. The rotating centrifugal fan 3 generates a directional airflow inside the top cover 26, blowing the carbon powder generated by the friction between the slip ring and the carbon brush toward the outer wall of the top cover. Under the combined action of centrifugal force and airflow, the carbon powder is adsorbed on the surface of the breathable carbon powder filter felt 8, thereby realizing the continuous recovery and collection of carbon powder, effectively preventing short circuits caused by internal powder accumulation, and improving the unit's operating environment.

[0040] This invention has a compact structure, is easy to disassemble and maintain, and all major connections are mechanically locked, ensuring safety and reliability.

[0041] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be permuted and combined. Those skilled in the art can exhaust all possibilities based on the mathematical knowledge of permutation and combination. Therefore, the present invention will not describe the technical solutions after permutation and combination one by one, but it should be understood that the technical solutions after permutation and combination have been disclosed by the present invention.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A centrifugal dust collector for carbon powder recovery in variable speed generator sets, characterized in that: The device includes a fan support plate (1), a centrifugal fan (3), an insulating washer (4), a dust collection device cover plate (6), a dust collection device fixing plate (7), and a breathable carbon powder filter felt (8). The fan support plate (1) is fixedly installed on the top of the variable speed unit main shaft (25), and the centrifugal fan (3) is installed on the fan support plate (1) and rotates accordingly. The dust collection device fixing plate (7) is connected to the vertical rib of the variable speed unit top cover (26), and the dust collection device cover plate (6) is detachably installed on the dust collection device fixing plate (7). The insulating washer (4) is disposed between the dust collection device cover plate (6) and the rotating centrifugal fan (3). The breathable carbon powder filter felt (8) is installed on the outer wall of the variable speed unit top cover (26) and is located on the airflow path guided by the rotation of the centrifugal fan (3) to collect carbon powder.

2. A centrifugal dust collector for carbon recovery in a variable speed unit according to claim 1, characterized in that: The fan support plate (1) is made of Q355B steel plate and is circular in shape. The inner circle of its lower plane is machined with a stop that cooperates with the main shaft (25) of the variable speed unit, and the outer circle of its upper plane is machined with a stop that cooperates with the centrifugal fan (3). The fan support plate (1) has multiple first threaded holes on the inner circle and multiple second threaded holes on the outer circle.

3. A centrifugal dust collector for carbon recovery in a variable speed unit according to claim 1 or 2, characterized in that: The fan support plate (1) and the main shaft (25), as well as the fan support plate (1) and the centrifugal fan (3), are connected and fixed by high-strength bolt assemblies.

4. A centrifugal dust collector for carbon powder recovery in a variable speed unit according to claim 1, characterized in that: The centrifugal fan (3) is made of Q355B steel plate and is circular in shape. It consists of an upper steel plate (13), a lower steel plate (14) and multiple intermediate blades (15) welded between the two. The lower steel plate (14) has a stop that matches the fan support plate (1) on its inner circular side and is provided with multiple mounting holes.

5. A centrifugal dust collector for carbon powder recovery in a variable speed unit according to claim 1, characterized in that: The insulating gasket (4) is made of epoxy insulating material with an insulation class of F. The insulating gasket (4) is fan-shaped and has multiple gaskets arranged along the circumference. There is a gap between its inner circle and the outer circle of the centrifugal fan (3), and it is fixed to the inner side of the dust collection device cover plate (6) by a connector.

6. A centrifugal dust collector for carbon powder recovery in a variable speed unit according to claim 1, characterized in that: The dust collection device cover plate (6) is made of Q235B steel plate and is fan-shaped with multiple parts arranged along the circumference. Each dust collection device cover plate (6) has a handle (16) on the top, light holes for connection on both sides, and threaded holes on the inner circle side.

7. A centrifugal dust collector for carbon powder recovery in a variable speed unit according to claim 1, characterized in that: The dust collection device fixing plate (7) is made of Q355B steel plate and has an overall I-shaped structure. It is assembled by welding the upper joint plate (17), vertical rib (18), transition plate (19), fixing plate (20) and lower joint plate (21), and is connected to the dust collection device cover plate (6) by bolts.

8. A centrifugal dust collector for carbon powder recovery in a variable speed unit according to claim 1, characterized in that: The breathable carbon powder filter felt (8) is rectangular in shape and has multiple pieces arranged along the circumferential direction of the outer wall of the top cover (26). The filter felt (8) is clamped by a stainless steel clamp (23) bent to the same arc as the outer wall of the top cover and fixed to the outer wall of the variable speed unit top cover (26) by bolts.

9. A centrifugal dust collector for carbon powder recovery in a variable speed unit according to claim 8, characterized in that: The stainless steel clamp (23) has a ventilation rectangular hole in the center and multiple mounting holes on its edge for mounting bolts (24) to be inserted for fixing.

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