Water turbine set carbon brush collector ring carbon powder collecting system and method

Abstract

The invention discloses a hydraulic turbine set carbon brush collector ring carbon powder collection system and method.The hydraulic turbine set carbon brush collector ring carbon powder collection system comprises a fixed ring, an upper static cover, a lower static cover and a movable ring assembly, the fixed ring is arranged on the outer side of the collector ring in a sleeving mode, the upper static cover is installed on the upper side of the fixed ring, the lower static cover is installed on the lower side of the fixed ring, and a carbon brush installation hole is formed in the fixed ring; the movable ring assembly comprises an upper movable ring and a lower movable ring, the upper movable ring is installed on the upper side of the collecting ring, and the lower movable ring is installed on the lower side of the collecting ring; the upper static cover is in sliding sealing connection with the upper moving ring; the lower static cover is in sliding sealing connection with the lower moving ring; the upper static cover is communicated with an exhaust system, and the lower static cover is connected with an air inlet system. The carbon powder collecting device can collect carbon powder generated by the water turbine carbon brush and the collecting ring, the collecting effect is high, and the operating environment of the carbon brush and the collecting ring can be improved at the same time.

Description

Technical Field

[0001] This invention relates to the field of hydro-generator technology, and more particularly to a carbon powder collection system and method for carbon brush slip rings of hydro-generator units. Background Technology

[0002] Carbon brushes and slip rings are key components of hydro generators. In actual operation, abnormal wear of carbon brushes accompanied by a large amount of wear debris can seriously affect the operation of hydro generators, directly causing problems such as sparking on the contact surface, damage to the surface of carbon brushes and slip rings, abnormal wear of carbon brushes, and abnormal operating conditions.

[0003] The existing carbon brush and slip ring systems in power plants have the following technical defects: First, the existing dust removal system utilizes the flow generated by the slip ring itself, which is not very efficient; Second, in situations where there is dust between the carbon brush and the slip ring, or when the temperature is too high, electric arcs are easily generated.

[0004] In the existing technologies CN215031509 and CN120033938A, conformal felt and cleaning brush are used to collect and remove carbon powder, which is not only inefficient but also cannot be applied to hydro-generators. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the problems existing in the background art and provide a carbon powder collection system and method for turbine carbon brush and slip ring, which can collect the carbon powder generated by turbine carbon brush and slip ring with high collection efficiency and can simultaneously improve the operating environment of carbon brush and slip ring.

[0006] To achieve the above-mentioned technical features, the present invention aims to provide a carbon brush collector ring carbon powder collection system for a hydro turbine unit, comprising a fixed ring, an upper stationary cover, a lower stationary cover, and a rotating ring assembly. The fixed ring is fitted onto the outside of the collector ring, the upper stationary cover is installed on the upper side of the fixed ring, and the lower stationary cover is installed on the lower side of the fixed ring. The fixed ring is provided with carbon brush mounting holes for installing the carbon brush assembly. The rotating ring assembly includes an upper rotating ring and a lower rotating ring, the upper rotating ring being installed on the upper side of the collector ring, and the lower rotating ring being installed on the lower side of the collector ring. The upper stationary cover and the upper rotating ring are slidably and sealingly connected, and the lower stationary cover and the lower rotating ring are also slidably and sealingly connected. The upper stationary cover is connected to the exhaust system, and the lower stationary cover is connected to the intake system.

[0007] The outer wall of the fixed ring is fixedly connected to a support base, the support column is connected to the support base for support, and the support column is installed on the foundation of the factory building.

[0008] The upper stationary cover includes an upper ring body with a first outer flange at its lower end and a first inner flange at its upper end. The lower stationary cover includes a lower ring body with a second outer flange at its upper end and a second inner flange at its lower end. The inner wall of the fixing ring is provided with a mounting ring. The first outer flange is mounted on the upper side of the mounting ring by bolts, and the second outer flange is mounted on the lower side of the mounting ring by bolts. The first inner flange is slidably and sealingly connected to the upper moving ring, and the second inner flange is slidably and sealingly connected to the lower moving ring. The upper and lower ring bodies are provided with clearance holes for inserting carbon brush assemblies.

[0009] The upper and lower ring bodies are respectively provided with multiple limiting notches and multiple limiting protrusions at opposite ends, and the limiting protrusions are used to be inserted into the limiting notches.

[0010] The first inner flange is provided with an upper air hole, which is connected to the exhaust system through an upper manifold; the second inner flange is provided with a lower air hole, which is connected to a manifold ring through a lower manifold ring. The manifold ring is sleeved on the outside of the main shaft of the turbine unit and is connected to the air intake system; the upper manifold ring and the lower manifold ring are provided corresponding to the carbon brush assembly.

[0011] A connecting ring is installed on the main shaft of the turbine unit. A support ring is fixedly installed on the outer circumference of the connecting ring. A collector ring is installed on the upper and lower sides of the support ring. The upper moving ring is located at the top of the upper collector ring, and the lower moving ring is located at the bottom of the lower collector ring. Insulating rings are installed between the upper moving ring and the upper collector ring, between the upper collector ring and the support ring, between the support ring and the lower collector ring, and between the lower collector ring and the lower moving ring. The upper moving ring, insulating ring, collector ring, support ring, and lower moving ring are connected and fixed by insulating bolts.

[0012] The carbon brush assembly includes a carbon brush box with an external mounting flange. A pressure cap is installed at one end of the carbon brush box, and a carbon brush is installed at the other end. Inside the carbon brush box, from the pressure cap side to the carbon brush side, a pressure regulating gasket, a pressure sensor, a support gasket, a spring, and an insulating gasket are installed in sequence. The end of the carbon brush box with the carbon brush installed is inserted into the carbon brush mounting hole. The mounting flange is connected and fixed to the retaining ring by screws, and the carbon brush elastically abuts against the slip ring.

[0013] A cooler is installed on the air intake system.

[0014] The exhaust system is equipped with a toner collection device and an induced draft fan, with the induced draft fan located downstream of the toner collection device. The toner collection device includes an expansion box, with a collection cylinder connected to the lower side of the expansion box. A dust collection hopper is connected to the bottom of the collection cylinder, and a sealing plate is detachably installed at the bottom of the dust collection hopper. A return air duct is fixedly installed in the center of the collection cylinder through a multi-layer air guide assembly. Each layer of the air guide assembly consists of multiple air guide plates surrounding the return air duct. The air guide plates have an angle with the horizontal plane, and the angle between the air guide plates on each layer of the air guide assembly decreases from top to bottom. The top of the return air duct is connected to the air inlet of the induced draft fan through an elbow inside the expansion box. A method for collecting carbon dust from carbon brush slip rings in a hydro-turbine unit, employing the aforementioned carbon dust collection system for hydro-turbine unit carbon brush slip rings, includes the following steps: S1. When collecting toner, start the induced draft fan, and air enters the lower collecting ring from the intake system; S2. Then the air enters the area between the stationary ring and the collector ring through multiple lower collector pipes from the collector ring to cool the carbon brush assembly. The upper moving ring, lower moving ring, upper stationary cover and lower stationary cover form a closed space. At the same time, the airflow carries the carbon powder generated by friction upward into the upper collector pipe. S3. The air mixed with toner in the collecting pipe is gathered into the exhaust system and then enters the toner collection device through the exhaust system. S4. After the air mixed with carbon powder enters the expansion box, the airflow pressure decreases and the flow rate slows down because the diameter of the expansion box is larger than the diameter of the exhaust system pipe. S5. As the lower end of the return air duct extends into the lower end of the collection cylinder, the flow velocity slows down, and the airflow moves downward along the collection cylinder. During the movement, due to the multi-layer air guide components installed inside the collection cylinder, the airflow flows downward in a spiral. As the angle of the air guide plates on the air guide components decreases, the airflow is gradually accelerated. Under the action of centrifugal force, the carbon powder in the airflow moves away from the return air duct and moves downward along the inner wall of the collection cylinder. When the airflow reaches the lower end of the return air duct, the airflow enters the return air duct and enters the downstream dust collection system through the induced draft fan. The carbon powder continues to move downward under the action of centrifugal force and finally falls into the dust collection hopper for collection.

[0015] The present invention, which adopts the above technical solution, has the following prominent features compared with the prior art: 1. In this invention, the fixed ring is fixedly installed, with a uniform interval between the fixed ring and the collector ring. The upper and lower stationary covers are respectively installed on the upper and lower sides of the fixed ring, and the upper and lower moving rings are respectively installed on the upper and lower sides of the collector ring. Referring to the figure, the upper stationary cover overlaps the upper moving ring, and the lower stationary cover overlaps the lower moving ring by a certain distance, achieving a sliding seal and forming a relatively closed space between the carbon brush and the collector ring, preventing carbon dust diffusion. The air intake system provides clean air to the closed space. The clean air can be filtered room temperature air or cooled and dried air. The exhaust system provides negative pressure, allowing the air entering from the air intake system to cool the carbon brush and collector ring and remove the carbon dust generated by the carbon brush and collector ring. Through the above structure, this invention can collect the carbon dust generated by the turbine carbon brush and collector ring, achieving a high collection efficiency and simultaneously improving the operating environment of the carbon brush and collector ring.

[0016] 2. This invention adds a pressure sensor inside the carbon brush holder, enabling real-time detection of the contact pressure of the carbon brush slip ring for timely replacement of the carbon brush. The pressure cap is installed on the outer end of the carbon brush holder with screws, and the pressure of the carbon brush against the slip ring can be adjusted by adjusting the number or thickness of the pressure regulating shims.

[0017] 3. The exhaust system of this invention is equipped with a carbon powder collection device and an induced draft fan. After depressurization and speed reduction, the airflow flows downward into the collection cylinder. Due to the multi-layer air guide assembly installed inside the collection cylinder, the airflow flows downward in a spiral motion. As the angle of the air guide plates on the air guide assembly decreases, the airflow is accelerated step by step. Under the action of centrifugal force, the carbon powder in the airflow moves away from the return air duct and moves downward along the inner wall of the collection cylinder. When the airflow reaches the lower end of the return air duct, the central airflow enters the return air duct and enters the downstream dust collection system via the induced draft fan. The carbon powder adhering to the inner wall of the collection cylinder continues to move downward under the action of centrifugal force and finally falls into the dust collection hopper for collection. By combining the depressurization and speed reduction of the expansion box with the centrifugal acceleration of the air guide assembly, the airflow's own kinetic energy is converted into centrifugal force to achieve dust separation, rather than relying on resistance components such as filter screens and filter bags. The airflow resistance is smaller, and the induced draft fan does not need to overcome excessive filtration resistance, which can reduce power consumption. At the same time, it reduces the cost of filter material replacement and has better long-term operating economy. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the fixing ring of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of the present invention when the upper and lower static covers are separated.

[0022] Figure 4 This is a schematic diagram of the structure of the upper and lower static covers when they are assembled and closed according to the present invention.

[0023] Figure 5 This is a top view of the structure of the present invention, in which the intake system and exhaust system are not shown.

[0024] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure of AA.

[0025] Figure 7 This is a schematic diagram of the carbon brush assembly of the present invention.

[0026] Figure 8 This is a schematic diagram of the toner collection device of the present invention.

[0027] Figure 9 for Figure 8 Schematic diagram of the cross-sectional structure of BB.

[0028] Figure 10 This is a schematic diagram showing the angle of the air guide plate of the present invention changing from top to bottom.

[0029] Figure label: Main shaft 1, connecting ring 2, support ring 3, insulating ring 4, slip ring 5, insulating bolt 6; Pillar 10; 20 retaining ring, 21 mounting ring, 22 carbon brush mounting hole, 23 support base; Upper static cover 30, upper ring body 31, clearance hole 311, limiting notch 312, limiting protrusion 313, first outer flange 32, first inner flange 33, upper air hole 331; Lower static cover 40, lower ring body 41, second outer flange 42, second inner flange 43, lower air hole 431; Carbon brush assembly 50, carbon brush box 51, mounting flange 52, gland 53, spring 54, support gasket 55, pressure sensor 56, pressure regulating gasket 57, carbon brush 58, insulating gasket 59; The rotating ring assembly 60 consists of an upper rotating ring 61 and a lower rotating ring 62. Intake system 70, manifold ring 71, lower manifold 72, cooler 73; Exhaust system 80, upper manifold 81, valve 82, toner collection device 83, expansion box 831, collection cylinder 832, dust collection hopper 833, sealing plate 834, return air duct 835, air guide plate 836, induced draft fan 84. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0032] Example 1: See Figure 1-10 A carbon brush collector ring carbon powder collection system for a water turbine unit includes a fixed ring 20, an upper stationary cover 30, a lower stationary cover 40, and a rotating ring assembly 60. The fixed ring 20 is fitted onto the outside of the collector ring 5. The upper stationary cover 30 is installed on the upper side of the fixed ring 20, and the lower stationary cover 40 is installed on the lower side of the fixed ring 20. The fixed ring 20 is provided with a carbon brush mounting hole 22 for installing the carbon brush assembly 50. The rotating ring assembly 60 includes an upper rotating ring 61 and a lower rotating ring 62. The upper rotating ring 61 is installed on the upper side of the collector ring 5, and the lower rotating ring 62 is installed on the lower side of the collector ring 5. The upper stationary cover 30 is slidably and sealingly connected to the upper rotating ring 61, and the lower stationary cover 40 is slidably and sealingly connected to the lower rotating ring 62. The upper stationary cover 30 is connected to the exhaust system 80, and the lower stationary cover 40 is connected to the intake system 70.

[0033] The fixed ring 20 is fixedly installed, and there is a uniform gap between the fixed ring 20 and the collector ring 5. The upper stationary cover 30 and the lower stationary cover 40 are respectively installed on the upper and lower sides of the fixed ring 20. The upper moving ring 61 and the lower moving ring 62 are respectively installed on the upper and lower sides of the collector ring 5. See [reference needed] Figure 6 The upper stationary cover 30 and the upper moving ring 61, as well as the lower stationary cover 40 and the lower moving ring 62, overlap by a certain distance to achieve a sliding seal, forming a relatively closed space between the carbon brush and the slip ring 5, preventing carbon dust diffusion. The intake system 70 provides clean air to the closed space; this clean air can be filtered room temperature air or cooled and dried air. The exhaust system 80 provides negative pressure, allowing the air entering from the intake system 70 to cool the carbon brush and slip ring 5 and carry away the carbon dust generated by them. Through this structure, the present invention can collect the carbon dust generated by the turbine carbon brush and slip ring with high collection efficiency and simultaneously improve the operating environment of the carbon brush and slip ring.

[0034] In this embodiment, see Figure 2 A support base 23 is fixedly connected to the outer wall of the fixing ring 20, and the support column 10 is connected and supported to the support base 23. The support column 10 is installed on the foundation of the factory building. The fixing ring 20 is installed and fixed through the above structure.

[0035] See Figure 3 The upper stationary cover 30 includes an upper ring body 31, with a first outer flange 32 at its lower end and a first inner flange 33 at its upper end. The lower stationary cover 40 includes a lower ring body 41, with a second outer flange 42 at its upper end and a second inner flange 43 at its lower end. A mounting ring 21 is provided on the inner wall of the fixing ring 20. The first outer flange 32 is bolted to the upper side of the mounting ring 21, and the second outer flange 42 is bolted to the lower side of the mounting ring 21. The first inner flange 33 is slidably and sealingly connected to the upper moving ring 61, and the second inner flange 43 is slidably and sealingly connected to the lower moving ring 62. The upper ring body 31 and the lower ring body 41 are provided with clearance holes 311 for inserting the carbon brush assembly 50. Through the above structure, a closed space is formed between the carbon brush and the collector ring 5.

[0036] Further, see Figure 3 , 4 The upper ring body 31 and the lower ring body 41 are respectively provided with a plurality of limiting notches 312 and a plurality of limiting protrusions 313 at opposite ends. The limiting protrusions 313 are used to be inserted into the limiting notches 312. Figure 3 This is a schematic diagram of the structure when the upper and lower stationary covers are separated. Figure 4 A schematic diagram of the upper and lower stationary covers when assembled. This structure ensures that the upper stationary cover 30 and lower stationary cover 40 are accurately aligned during installation, guaranteeing that each clearance hole 311 is in its corresponding position.

[0037] To cool each carbon brush assembly 50 and promptly remove the carbon dust generated by friction within the carbon brush assembly 50, see [link to relevant documentation]. Figure 1 , 3 5. An upper air hole 331 is provided on the first inner flange 33, and the upper air hole 331 is connected to the exhaust system 80 through the upper manifold 81; a lower air hole 431 is provided on the second inner flange 43, and the lower air hole 431 is connected to the manifold ring 71 through the lower manifold 72. The manifold ring 71 is sleeved on the outside of the main shaft 1 of the turbine unit and is connected to the intake system 70; the upper manifold 81 and the lower manifold 72 are provided corresponding to the carbon brush assembly 50.

[0038] In this embodiment, a cooler 73 is installed on the intake system 70 to cool the filtered and dried air, further improving the operating environment of the carbon brush and slip ring.

[0039] Example 2: Based on Example 1, see Figure 1 , 6 A connecting ring 2 is installed on the main shaft 1 of the turbine unit. A support ring 3 is fixedly installed on the outer circumference of the connecting ring 2. A collector ring 5 is installed on the upper and lower sides of the support ring 3, respectively. An upper moving ring 61 is located at the top of the upper collector ring 5, and a lower moving ring 62 is located at the bottom of the lower collector ring 5. Insulating rings 4 are installed between the upper moving ring 61 and the upper collector ring 5, between the upper collector ring 5 and the support ring 3, between the support ring 3 and the lower collector ring 5, and between the lower collector ring 5 and the lower moving ring 62. The upper moving ring 61, the insulating ring 4, the collector ring 5, the support ring 3, and the lower moving ring 62 are connected and fixed by insulating bolts 6. The above structure enables the installation of the collector ring 5, the upper moving ring 61, and the lower moving ring 62, and ensures the insulation of the collector ring 5.

[0040] Example 3: Based on Embodiment 1 or Embodiment 2, the present invention further improves the carbon brush assembly 50 in order to adapt to the dust collection system of the present invention.

[0041] See Figure 6 , 7 The carbon brush assembly 50 includes a carbon brush box 51. The carbon brush box 51 is provided with an external mounting flange 52. A pressure cap 53 is installed at one end of the carbon brush box 51, and a carbon brush 58 is installed at the other end. Inside the carbon brush box 51, from the pressure cap 53 side to the carbon brush 58 side, a pressure regulating gasket 57, a pressure sensor 56, a support gasket 55, a spring 54, and an insulating gasket 59 are installed in sequence. The end of the carbon brush box 51 where the carbon brush 58 is installed passes through the carbon brush mounting hole 22. The mounting flange 52 is connected and fixed to the retaining ring 20 by screws. The carbon brush 58 elastically abuts against the collector ring 5.

[0042] A square mounting flange 52 is designed in the middle of the outer wall of the carbon brush holder 51. After the carbon brush holder 51 is inserted radially into the carbon brush mounting hole 22 from the outside, it is fixed to the retaining ring 20 by bolts. An oval hole is designed on the side of the carbon brush holder 51 to facilitate the protrusion of the carbon brush cable. The contact pressure between the carbon brush 58 and the slip ring 5 can be adjusted by adjusting the thickness of the pressure regulating shim 57. A hole is cut in the middle of the pressure cap 53 to facilitate the wiring of the pressure sensor 56 to pass through the hole in the middle of the pressure cap 53. The wiring of the pressure sensor 56 can be connected to the control system to detect the real-time contact pressure of the carbon brush slip ring. When the carbon brush 58 is severely worn and the carbon brush spring 54 cannot provide sufficient pressure, the pressure of the carbon brush 58 against the slip ring can be adjusted by adjusting the number or thickness of the pressure regulating shims 57.

[0043] Example 4: Based on Embodiment 1 or Embodiment 2, the exhaust system 80 of the present invention is equipped with a toner collection device 83 and an induced draft fan 84, with the induced draft fan 84 located downstream of the toner collection device 83. Air is discharged outwards by the induced draft fan 84, allowing air to enter from the intake system 70, cooling the carbon brushes and slip rings 5, and carrying away the toner generated by the carbon brushes and slip rings 5. The toner collection device 83 is used for the initial collection of the carried-out toner.

[0044] Specifically, see Figure 8 , 9 10. The toner collection device 83 includes an expansion box 831, a collection cylinder 832 connected to the lower side of the expansion box 831, a dust collection hopper 833 connected to the bottom of the collection cylinder 832, a sealing plate 834 detachably installed at the bottom of the dust collection hopper 833, and a return air duct 835 fixedly installed at the center of the collection cylinder 832 through a multi-layer air guide assembly. Each layer of the air guide assembly consists of multiple air guide plates 836 surrounding the return air duct 835. The air guide plates 836 have an angle with the horizontal plane, and the angle of the air guide plates 836 on each layer of the air guide assembly decreases from top to bottom. Figure 10 As shown, the angle between the air guide plate 836 on the uppermost air guide assembly and the horizontal plane is 'a', and the angle between the air guide plate 836 on the lowermost air guide assembly and the horizontal plane is 'b'. The angles of the air guide plates 836 on each layer of the air guide assembly decrease from 'a' to 'b'. In this embodiment, the air guide assembly has three layers, and the angle between the air guide plate 836 on the uppermost air guide assembly and the horizontal plane is... The angle between the air guide plate 836 of the intermediate layer air guide assembly and the horizontal plane is... The angle between the air guide plate 836 of the lowest air guide assembly and the horizontal plane is... The top of the return air duct 835 is connected to the air inlet of the induced draft fan 84 via an elbow inside the expansion box 831. The diameter of the expansion box 831 is larger than the inner diameter of the exhaust system 80 pipe, thereby reducing the pressure and speed of the airflow in the exhaust system 80 pipe. The reduced-pressure and slowed airflow flows downward into the collection cylinder 832. Because the collection cylinder 832 is equipped with multiple layers of air guiding components, the airflow flows downward in a spiral. As the angle of the air guide plates 836 on the air guiding components decreases, the airflow path increases, and the airflow is accelerated step by step. Under the action of centrifugal force, the carbon powder in the airflow moves away from the return air duct 835 and moves downward along the inner wall of the collection cylinder 832. When the airflow reaches the lower end of the return air duct 835, the central airflow enters the return air duct 835, passes through the induced draft fan 84, and enters the downstream dust collection system. The carbon powder adhering to the inner wall of the collection cylinder 832 continues to move downward under the action of centrifugal force and finally falls into the dust collection hopper 833 for collection. By combining the pressure reduction and speed reduction of the expansion box with the centrifugal acceleration of the air guide assembly, dust separation is achieved by converting the kinetic energy of the airflow itself into centrifugal force, rather than relying on resistance components such as filter screens and filter bags. This results in lower airflow resistance, and the induced draft fan 84 does not need to overcome excessive filtration resistance, thus reducing power consumption. At the same time, it reduces the cost of filter material replacement and has better long-term operating economy.

[0045] During regular cleaning, open the sealing plate 834 to clean the carbon powder inside the dust collection hopper 833.

[0046] Example 5: A method for collecting carbon dust from the carbon brush slip rings of a hydro-turbine unit employs the carbon dust collection system for the carbon brush slip rings of a hydro-turbine unit described in Example 4. (See also...) Figure 1 , 8 The collection method includes the following steps: S1. When collecting toner, start the induced draft fan 84, and air enters the lower collecting ring 71 from the intake system 70; S2. Then the air enters the area between the fixed ring 20 and the collector ring 5 through multiple lower collector pipes 72 from the collector ring 71 to cool the carbon brush assembly 50. The upper moving ring 61, the lower moving ring 62, the upper stationary cover 30 and the lower stationary cover 40 form a closed space. At the same time, the airflow carries the carbon powder generated by friction upward into the upper collector pipe 81. S3. The air mixed with toner in the collecting pipe 81 is drawn into the exhaust system 80 and then enters the toner collection device 83 through the exhaust system 80. S4. After the air mixed with carbon powder enters the expansion box 831, the airflow pressure decreases and the flow rate slows down because the diameter of the expansion box 831 is larger than the diameter of the exhaust system 80 pipe. S5. Since the lower end of the return air duct 835 extends into the lower end of the collection cylinder 832, the flow velocity slows down and the airflow moves downward along the collection cylinder 832. During the movement, since the collection cylinder 832 is equipped with multiple layers of air guiding components, the airflow flows downward in a spiral. As the angle of the air guiding plates 836 on the air guiding components decreases, the airflow is gradually accelerated. Under the action of centrifugal force, the carbon powder in the airflow moves away from the return air duct 835 and moves downward along the inner wall of the collection cylinder 832. When the airflow moves to the lower end of the return air duct 835, the airflow enters the return air duct 835 and enters the downstream dust collection system through the induced draft fan 84. The carbon powder continues to move downward under the action of centrifugal force and finally falls into the dust collection hopper 833 for collection.

[0047] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the invention. Modifications and variations made by those skilled in the art in accordance with the spirit of the invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A carbon powder collection system for carbon brush slip rings in a water turbine unit, characterized in that: The assembly includes a fixed ring (20), an upper stationary cover (30), a lower stationary cover (40), and a rotating ring assembly (60). The fixed ring (20) is fitted onto the outside of the collector ring (5). The upper stationary cover (30) is installed on the upper side of the fixed ring (20), and the lower stationary cover (40) is installed on the lower side of the fixed ring (20). The fixed ring (20) is provided with carbon brush mounting holes (22) for installing the carbon brush assembly (50). The rotating ring... The component (60) includes an upper moving ring (61) and a lower moving ring (62). The upper moving ring (61) is installed on the upper side of the slip ring (5), and the lower moving ring (62) is installed on the lower side of the slip ring (5). The upper stationary cover (30) is slidably sealed to the upper moving ring (61), and the lower stationary cover (40) is slidably sealed to the lower moving ring (62). The upper stationary cover (30) is connected to the exhaust system (80), and the lower stationary cover (40) is connected to the intake system (70).

2. The carbon powder collection system for carbon brush slip rings of a hydro-turbine unit according to claim 1, characterized in that: The outer wall of the fixed ring (20) is fixedly connected to the support seat (23), the column (10) is connected and supported to the support seat (23), and the column (10) is installed on the foundation of the factory building.

3. The carbon powder collection system for carbon brush slip rings of a water turbine unit according to claim 1, characterized in that: The upper stationary cover (30) includes an upper ring body (31), the lower end of which is provided with a first outer flange (32), and the upper end of which is provided with a first inner flange (33); the lower stationary cover (40) includes a lower ring body (41), the upper end of which is provided with a second outer flange (42), and the lower end of which is provided with a second inner flange (43); the inner wall of the fixing ring (20) is provided with an mounting ring ( 21) The first outer flange (32) is bolted to the upper side of the mounting ring (21), and the second outer flange (42) is bolted to the lower side of the mounting ring (21). The first inner flange (33) is slidably sealed to the upper moving ring (61), and the second inner flange (43) is slidably sealed to the lower moving ring (62). The upper ring body (31) and the lower ring body (41) are provided with clearance holes (311) for the insertion of the carbon brush assembly (50).

4. The carbon powder collection system for carbon brush slip rings of a water turbine unit according to claim 3, characterized in that: The upper ring body (31) and the lower ring body (41) are respectively provided with a plurality of limiting notches (312) and a plurality of limiting protrusions (313) at opposite ends. The limiting protrusions (313) are used to be inserted into the limiting notches (312).

5. The carbon powder collection system for carbon brush slip rings of a water turbine unit according to claim 3, characterized in that: The first inner flange (33) is provided with an upper air hole (331), which is connected to the exhaust system (80) through an upper manifold (81); the second inner flange (43) is provided with a lower air hole (431), which is connected to a manifold (71) through a lower manifold (72), and the manifold (71) is sleeved on the outside of the main shaft (1) of the turbine unit and is connected to the air intake system (70); the upper manifold (81) and the lower manifold (72) are provided corresponding to the carbon brush assembly (50).

6. The carbon powder collection system for carbon brush slip rings of a water turbine unit according to claim 1, characterized in that: A connecting ring (2) is installed on the main shaft (1) of the turbine unit. A support ring (3) is fixedly installed on the outer circumference of the connecting ring (2). A collector ring (5) is installed on the upper and lower sides of the support ring (3). The upper moving ring (61) is located at the top of the upper collector ring (5), and the lower moving ring (62) is located at the bottom of the lower collector ring (5). An insulating ring (4) is installed between the upper moving ring (61) and the upper collector ring (5), between the upper collector ring (5) and the support ring (3), between the support ring (3) and the lower collector ring (5), and between the lower collector ring (5) and the lower moving ring (62). The upper moving ring (61), the insulating ring (4), the collector ring (5), the support ring (3), and the lower moving ring (62) are connected and fixed by insulating bolts (6).

7. The carbon powder collection system for carbon brush slip rings of a water turbine unit according to claim 1, characterized in that: The carbon brush assembly (50) includes a carbon brush box (51), and an installation flange (52) is provided on the outside of the carbon brush box (51). A pressure cap (53) is installed at one end of the carbon brush box (51), and a carbon brush (58) is installed at the other end. A pressure regulating gasket (57), a pressure sensor (56), a support gasket (55), a spring (54), and an insulating gasket (59) are installed in sequence from the pressure cap (53) side to the carbon brush (58) side inside the carbon brush box (51). The end of the carbon brush box (51) with the carbon brush (58) installed is inserted into the carbon brush mounting hole (22). The installation flange (52) is connected and fixed to the fixing ring (20) by screws. The carbon brush (58) elastically abuts against the collector ring (5).

8. The carbon powder collection system for carbon brush slip rings of a water turbine unit according to claim 1, characterized in that: A cooler (73) is installed on the intake system (70).

9. The carbon powder collection system for carbon brush slip rings of a water turbine unit according to claim 5, characterized in that: The exhaust system (80) is equipped with a toner collection device (83) and an induced draft fan (84), with the induced draft fan (84) located downstream of the toner collection device (83). The toner collection device (83) includes an expansion box (831), a collection cylinder (832) is connected to the lower side of the expansion box (831), a dust collection hopper (833) is connected to the bottom of the collection cylinder (832), and a sealing plate (83) is detachably installed at the bottom of the dust collection hopper (833). 4) A return air duct (835) is fixedly installed in the center of the collection tube (832) through a multi-layer air guide assembly. Each layer of the air guide assembly consists of multiple air guide plates (836) surrounding the return air duct (835). The air guide plates (836) have an angle with the horizontal plane, and the angle of the air guide plates (836) on each layer of the air guide assembly decreases from top to bottom. The top of the return air duct (835) is connected to the air inlet of the induced draft fan (84) through an elbow in the expansion box (831).

10. A method for collecting carbon powder from the carbon brush slip ring of a hydro turbine unit, characterized in that: The turbine unit carbon brush collector ring carbon powder collection system according to claim 9 is used, and the collection method includes the following steps: S1. When collecting carbon powder, start the induced draft fan (84) and air enters the lower collecting ring (71) from the intake system (70). S2. Then, air enters the area between the fixed ring (20) and the collector ring (5) through multiple lower collector pipes (72) from the collector ring (71) to cool the carbon brush assembly (50). The upper moving ring (61), lower moving ring (62), upper stationary cover (30) and lower stationary cover (40) form a closed space. At the same time, the airflow carries the carbon powder generated by friction upward into the upper collector pipe (81). S3. The air mixed with carbon powder in the collecting pipe (81) is gathered into the exhaust system (80) and enters the carbon powder collection device (83) through the exhaust system (80); S4. After the air mixed with carbon powder enters the expansion box (831), the air pressure decreases and the flow rate slows down because the diameter of the expansion box (831) is larger than the diameter of the exhaust system (80) pipe. S5. Since the lower end of the return air duct (835) extends into the lower end of the collection cylinder (832), the flow rate slows down and the airflow moves downward along the collection cylinder (832). During the movement, since the collection cylinder (832) is equipped with multiple layers of air guide components, the airflow flows downward in a spiral. As the angle between the air guide plates (836) on the air guide components decreases, the airflow is gradually accelerated. Under the action of centrifugal force, the carbon powder in the airflow moves away from the return air duct (835) and moves downward along the inner wall of the collection cylinder (832). When the airflow moves to the lower end of the return air duct (835), the airflow enters the return air duct (835) and enters the downstream dust collection system through the induced draft fan (84). The carbon powder continues to move downward under the action of centrifugal force and finally falls into the dust collection hopper (833) for collection.

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