Active air seal current collection device of impact type hydraulic generator

Abstract

The invention discloses an active air sealing current collecting device of an impact type hydraulic generator. The active air sealing current collecting device is composed of a current collecting ring support, a current collecting ring, an insulating screw rod, an insulating block, a discrete type right-angle fan, an annular insulating wind shield, an inter-ring isolation plate and a locking device. According to the invention, the structure is stable, the influence of upper conduction vibration on a current collection part is reduced, the problems of unstable contact resistance and non-uniform brush current caused by unbalanced operation state brought by vibration are solved, and the operation stability of a unit is improved; according to the invention, a cooling air path in the water-turbine generator set is optimized, so that the overall cooling system of the water-turbine generator set is improved; the spiral groove structure can effectively take out carbon powder generated during friction of an electric brush along with operation of a unit, dust is prevented from being attached to the surfaces of the collecting ring and nearby elements, and the risk of abnormal operation and accidents is reduced; the device is flexible in structure and has wide engineering application and popularization value.

Description

Technical Field

[0001] The invention relates to the field of water turbine generators, and in particular to an active air-sealed current collecting device for an impulse water turbine generator. Background Art

[0002] The hydro-turbine generator is equipped with a collector to introduce the excitation current into the rotor winding. In recent years, with the development of large-capacity units, the excitation current has been continuously increased, resulting in more heat generation in the existing mechanism, higher temperature of the collector, and accompanied by sparking on the contact surface. The optimal operating temperature between the brush and the collector ring is 60-90℃. Operating within this temperature range is most likely to form an oxide film between the brush and the collector ring. To ensure this operating temperature, while considering the heat generated by the current, it is necessary to consider the heat generated by the friction between the brush and the collector ring to ensure that the operating temperature between the brush and the collector ring is within the optimal operating temperature range. When the running electric density of the brush is too low and the brush load is too light, it is not easy to establish an oxide film, which may scratch the brush surface; when the running electric density of the brush is too high, when the brush is overloaded, the surface of the brush will produce burnt spots, damaging the brush contact surface. Designing the collector only from the perspective of reducing the electric density faces many problems such as limited performance of carbon brush materials, insufficient design space, and poor air flow caused by increasing the number of carbon brushes and related equipment. Therefore, we should solve the above problems from the perspective of active heat dissipation. According to the structural characteristics, the traditional collector ring structure can be divided into sleeve type, bracket type, shaft cylinder type, etc. The traditional structure has a small heat dissipation effect and cannot meet the requirements of thermal balance to stabilize the system temperature. Therefore, a new active air seal collector device is urgently needed. Summary of the invention

[0003] In view of this, the present invention urgently needs to disclose an active air-sealed collector device with a stable structure that forms a heat dissipation air path. The technical solution of the present invention is specifically described as follows: The present invention consists of a collector ring bracket, a collector ring, an insulating screw, an insulating block, a discrete right-angle fan, an annular insulating wind shield, an inter-ring isolation plate, and a locking device. The collector ring, the annular insulating wind shield and the inter-ring isolation plate are fixed to the collector ring bracket by the insulating screw. The locking device cooperates with the collector ring bracket to lock the insulating screw. The inter-ring isolation plate is stuck in the groove of the collector ring. The discrete right-angle fan is mechanically locked to the upper surface of the collector ring by fixing fasteners. The upper end of the collector ring bracket is connected to the collector ring, and the lower end is fixed on the top shaft.

[0004] While ensuring the compact and reliable connection of the rotating parts, the discrete right-angle fan generates an active heat dissipation air path, and the annular insulating wind shield and the inter-annular isolation plate form a closed space to guide the formation of the air path.

[0005] In the above-mentioned active air-sealed collector device of the impulse turbine generator, the collector ring bracket is composed of an upper ring plate, a collector ring bracket wall, a lower ring plate, long blades, and short blades. The upper ring plate and the lower ring plate are welded together through the collector ring bracket wall. The evenly distributed long blades connect the upper and lower ring plates and the collector ring bracket wall, and the staggered and evenly distributed short blades connect the upper ring plate and the collector ring bracket wall. The two types of blades also serve as reinforcing ribs.

[0006] In the above-mentioned active air-sealed collector device of the impulse turbine generator, the lower surface of the upper ring plate has a circumferentially evenly distributed connecting level that cooperates with the locking device, the upper surface of the upper ring plate has an annular groove for limiting and fixing the isolation plate between the rings, and the upper surface of the upper ring plate is provided with circumferentially evenly distributed threaded holes for fixing the cover plate and the rotor lead support block.

[0007] In the above-mentioned active air-sealed collector of the impulse turbine generator, the lower ring plate has circumferentially evenly distributed light holes for connecting bolts of the top shaft, and the upper surface of the lower ring plate has circumferentially evenly distributed waist-shaped flattening corresponding to the connecting light holes, which is conducive to locking the fixed bolt gaskets.

[0008] The waist-shaped leveling is convenient for installing the top shaft connecting bolts on site, ensuring the flatness of the locking piece and the installation quality of the connection between the collector ring and the top shaft.

[0009] In the above-mentioned impulse turbine generator active air seal collector device, the long blade has a lifting hole for lifting the collector ring, and the position for welding with the collector ring bracket wall has a through-welding hole which is conducive to welding.

[0010] The profile of the long blades is conducive to the generation of cooling air and also serves as a reinforcing rib.

[0011] In the above-mentioned impulse turbine generator active air seal collector, a welding hole is provided at the position where the short blade of the collector ring bracket is welded to the collector ring bracket wall. The profile of the short blade is matched with the long blade, which is conducive to the generation of cooling air and also has the function of reinforcing the rib plate. The combination of long and short blades can actively plan the air path to send part of the heat to the internal air path of the rotor while meeting the installation requirements.

[0012] In the above-mentioned active air-sealed collector device of the impulse turbine generator, the upper and lower surfaces of the collector ring have ring grooves for limiting and fixing the isolation plate between the rings, and the side has a threaded groove structure, which is conducive to the formation of an air cushion effect between the contact surface carbon brush and the collector ring. The main body has a local circumferential hole for the passage and fixation of the insulating screw, and the upper surface is provided with a connection hole for fixing a discrete right-angle fan.

[0013] In the above-mentioned impulse turbine generator active air seal collector, the discrete right-angle fans are evenly distributed around the upper end of the upper collector ring, fixed by fasteners, and have a 5 mm installation gap with the annular insulating wind shield.

[0014] In the above-mentioned impulse turbine generator active air seal collector, the annular insulating wind shield is fixed to the upper end of the collector ring by means of insulating screws and insulating blocks, and there is a 5 mm installation gap with the discrete right-angle fan.

[0015] In the above-mentioned active air-sealed collector device of the impulse turbine generator, the locking device is connected to the upper ring plate of the collector ring bracket, leveled and welded into one body, and its lower surface supports the fastener to fix the insulating screw.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The collector ring of the present invention is equipped with a discrete right-angle fan, which can rotate with the group during power generation to generate active cooling wind. The wind path is planned and guided by the annular insulating wind shield, so that the cooling wind passes through the upper and lower collector rings, takes away the heat generated by the current, achieves a balance between heat generation and heat dissipation, and provides a reliable environment for the stable operation of the collector system.

[0018] 2. The collector ring support of the present invention is provided with vertical ribs that function as long and short blades. While ensuring the structural rigidity, it accelerates the air flow outside the collector device, allowing the heat of the collector part to flow into the large cycle, further enhancing the heat dissipation of the collector system. The radial and axial cooling winds generated by the long and short blades also have a certain cooling effect on the rotor part, improving the wind path system of the entire rotor.

[0019] 3. The collector ring surface of the present invention is provided with spiral grooves, which ensure the contact area of ​​the brush and the formation of the air cushion effect on the contact surface, which can effectively reduce the mechanical and electrical heat generation of the carbon brush in operation, and is conducive to the stable operation of the collector system. In addition, the spiral groove structure can effectively remove the carbon powder generated by the friction of the brush as the unit runs, and prevent the dust from adhering to the collector ring and the surface of nearby components, reducing the risk of abnormal operation and accidents.

[0020] 4. The collector ring assembly of the present invention is directly installed on the upper end of the top shaft and is not connected to the sliding rotor, so that the vibration of the brush holder and the collector ring is isolated from the vibration of the sliding rotor and the upper guide shoe, and they are not superimposed and affected by each other. The influence of the upper guide vibration when the brush and collector ring are connected in the traditional structure is greatly reduced, and the problem of unstable contact resistance and uneven brush current caused by the unbalanced operating state caused by the oscillation here is reduced.

[0021] 5. The present invention is applicable to large hydro-generator sets of different structures and sizes. The present invention can significantly reduce the temperature of the power collection system during operation, improve the operating stability of the power collection system, reduce the risk of accidents and the cost of frequent replacement of brushes. The present invention has a flexible structure and has a wide range of engineering applications and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following is a brief introduction to the drawings required for the embodiments:

[0023] Figure 1 This is the structural layout diagram of the active air seal collector device of the impulse turbine generator;

[0024] Figure 2 It is a cross-sectional view of a collector ring bracket of an active air seal collector device of an impulse turbine generator;

[0025] Figure 3 It is a top view of the collector ring bracket of the active air seal collector device of the impulse turbine generator;

[0026] Figure 4 This is a cross-sectional view of the collector ring of the active air seal collector device of the impulse turbine generator;

[0027] Figure 5 It is a schematic diagram of the discrete right-angle fan connection form of the active air seal collector of the impulse turbine generator.

[0028] Description of component numbers in the figure:

[0029] 1-collector ring bracket; 2-collector ring; 3-insulating screw; 4-insulating block; 5-discrete right-angle fan; 6-annular insulating wind shield; 7-inter-ring isolation plate; 8-locking device; 9-upper ring plate; 10-collector ring bracket wall; 11-lower ring plate; 12-long blades; 13-short blades; 14-connecting leveling; 15-ring groove; 16-upper ring plate threaded hole; 17-lower ring plate through hole; 18-lower ring plate waist-shaped leveling; 19-lifting hole for collector ring; 20-long blade welding hole; 21-short blade welding hole 22-ring groove; 23-threaded groove. DETAILED DESCRIPTION

[0030] In the description of the present invention, it should be understood that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only simplified descriptions for the convenience of describing the present invention, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0031] like Figure 1As shown, the active air seal collector device of the impulse turbine generator is composed of a collector ring bracket 1, a collector ring 2, an insulating screw 3, an insulating block 4, a discrete right-angle fan 5, an annular insulating wind shield 6, an inter-ring isolation plate 7, and a locking device 8. The collector ring 2, the annular insulating wind shield 6, and the inter-ring isolation plate 7 are fixed to the collector ring bracket 1 by the insulating screw 3. The locking device 8 cooperates with the collector ring bracket 1 to lock the insulating screw 3. The inter-ring isolation plate 7 is stuck in the groove of the collector ring. Figure 5 The discrete right-angle fan 5 shown is mechanically locked to the upper surface of the collector ring 2 by fixing fasteners. The upper end of the collector ring bracket 1 is connected to the collector ring, and the lower end is fixed to the top shaft.

[0032] like Figure 2 and Figure 3 As shown, the collector ring support 1 is composed of an upper ring plate 9, a collector ring support wall 10, a lower ring plate 11, long blades 12, and short blades 13. The upper ring plate 9 and the lower ring plate 11 are welded together through the collector ring support wall 10. The long blades 12 evenly distributed therebetween connect the upper and lower ring plates and the collector ring support wall, and the short blades 13 evenly distributed in an alternating manner connect the upper ring plate and the collector ring support wall. The two blades also serve as reinforcing ribs.

[0033] like Figure 4 As shown, the upper and lower surfaces of the collector ring 2 have ring grooves 22 for limiting and fixing the inter-ring isolation plate 7, and the side has a threaded groove structure 23, which is conducive to the formation of an air cushion effect between the contact surface carbon brush and the collector ring. The main body has a local circumferential hole for the passage and fixation of the insulating screw 3, and the upper surface is provided with a connection hole for fixing the discrete right-angle fan 5.

[0034] Specifically, this invention has a right-angle fan that can rotate with the unit during power generation to generate active cooling wind. The wind path is planned and guided by the annular insulating wind shield, so that the cooling wind passes through the upper and lower collector rings to take away the heat generated by the current, achieve a balance between heat generation and heat dissipation, and improve the unit's operating environment.

[0035] The collector ring support of the present invention is provided with vertical ribs that function as long and short blades, which speed up the air flow outside the collector device while ensuring the structural rigidity, so that the heat of the collector part is integrated into the large circulation, and the heat dissipation of the collector system is further enhanced. The radial and axial cooling winds generated by the long and short blades also have a certain cooling effect on the rotor part, improving the wind path system of the entire rotor.

[0036] The collector ring surface of the present invention is provided with spiral grooves, which ensure the contact area of ​​the brush and the formation of the air cushion effect on the contact surface, and can effectively reduce the mechanical and electrical heat generation of the carbon brush in operation, which is conducive to the stable operation of the collector system. In addition, the spiral groove structure can effectively remove the carbon powder generated by the friction of the brush as the unit runs, preventing dust from adhering to the collector ring and the surface of nearby components, reducing the risk of abnormal operation and accidents.

[0037] The collector ring assembly of the present invention is directly installed on the upper end of the top shaft and is not connected to the sliding rotor, so that the vibration of the brush holder and the collector ring is isolated from the vibration of the sliding rotor and the upper guide shoe, and they are not superimposed and affected by each other. The influence of the upper guide vibration when the brush and the collector ring are connected in the traditional structure is greatly reduced, and the problem of unstable contact resistance and uneven brush current caused by the unbalanced running state caused by the oscillation here is also reduced.

[0038] The present invention solves the problems that have been plaguing the turbine generator set, such as high temperature of the collector device, sparking on the contact surface between the brush and the collector ring, etc. The present invention utilizes the space, rotation speed and other resources of the unit itself from the perspective of heat dissipation, and solves the problems of narrow space and poor air path caused by reducing electrical density and increasing the number of brushes. The present invention has a stable structure, which is conducive to reducing the influence of the upper conduction vibration on the collector part, overcomes the problems of unstable contact resistance and uneven brush current caused by the unbalanced operating state caused by the oscillation, and improves the stability of the unit operation; the impulse turbine generator active air seal collector optimizes the cooling air path inside the turbine generator set, so that the overall cooling system of the turbine generator set is improved; and the spiral groove structure can effectively remove the carbon powder generated by the friction of the brush as the unit runs, prevent dust from adhering to the collector ring and the surface of nearby components, and reduce the risk of abnormal operation and accidents; the present invention has a flexible structure and has a wide range of engineering applications and promotion value.

[0039] Finally, the protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope and spirit of the present invention. If these changes and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these changes and modifications.

Claims

1. An active air-sealed current collector for an impulse turbine generator, characterized in that: The utility model comprises a collector ring support (1), a collector ring (2), an insulating screw (3), an insulating block (4), a discrete right-angle fan (5), an annular insulating wind shield (6), an inter-ring isolation plate (7), and a locking device (8). The insulating screw (3) fixes the collector ring (2), the annular insulating wind shield (6) and the inter-ring isolation plate (7) on the collector ring support (1). The locking device (8) cooperates with the collector ring support (1) to lock the insulating screw (3). The inter-ring isolation plate (7) is stuck in the groove of the collector ring. The discrete right-angle fan (5) is mechanically locked on the upper surface of the collector ring (2) by fixing fasteners. The upper end of the collector ring support (1) is connected to the collector ring, and the lower end is fixed on the top shaft.

2. The active air seal collector device for a Pelton turbine generator according to claim 1, characterized in that: The collector ring support (1) is composed of an upper ring plate (9), a collector ring support wall (10), a lower ring plate (11), long blades (12), and short blades (13); the upper ring plate (9) and the lower ring plate (11) are welded together through the collector ring support wall (10); the long blades (12) evenly distributed therebetween connect the upper and lower ring plates and the collector ring support wall; and the short blades (13) evenly distributed in an alternating manner connect the upper ring plate and the collector ring support wall.

3. The active air seal collector of a Pelton turbine generator according to claim 2, characterized in that: The lower surface of the upper ring plate (9) is provided with circumferentially evenly distributed connecting levelings (14) cooperating with the locking device (8), the upper surface of the upper ring plate (9) is provided with an annular groove (15) for limiting and fixing the inter-ring isolation plate (7), and the upper surface of the upper ring plate (9) is provided with circumferentially evenly distributed threaded holes (16) for fixing the cover plate and the rotor lead support block.

4. The active air seal collector of a Pelton turbine generator according to claim 2, characterized in that: The lower ring plate (11) is provided with circumferentially evenly distributed light holes (17) for connecting top shaft bolts, and the upper surface of the lower ring plate (11) is provided with circumferentially evenly distributed waist-shaped flattened surfaces (18) for locking with fixing bolt washers corresponding to the connecting light holes.

5. The active air seal collector device for a Pelton turbine generator according to claim 2, characterized in that: The long blade (12) is provided with a lifting hole (19) for lifting the collector ring, and a welding hole (20) is provided at the welding side of the collector ring support wall (10).

6. The active air-sealed current collector of an impulse turbine generator according to claim 2, characterized in that: A welding hole (21) is formed at the position where the short blade (13) is welded to the collector ring support wall (10).

7. The active air seal current collector of an impulse turbine generator according to claim 1, characterized in that: The upper and lower surfaces of the collector ring (2) are provided with annular grooves (22) for limiting and fixing the inter-ring isolation plate (7), the side surface is provided with a threaded groove structure (23), and the upper surface of the collector ring is provided with a connection hole for fixing a discrete right-angle fan (5).

8. The active air seal current collector of a Pelton turbine generator according to claim 1, characterized in that: The discrete right-angle fans (5) are evenly distributed around the circumference of the upper end of the upper collector ring and are fixed by fasteners.

9. The active air-sealed current collector of an impulse turbine generator according to claim 1, characterized in that: The annular insulating wind shield (6) is fixed to the upper end of the collector ring via an insulating screw (3) and an insulating block (4).

10. The active air seal current collector of an impulse turbine generator according to claim 1, characterized in that: The locking device (8) is welded integrally with the upper ring plate (9) of the collector ring bracket and the connecting leveling (14), and its lower surface supports a fastener to fix the insulating screw (3).

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