Rotating commutator disc for brushless exciter of steam turbine generator and assembling method thereof

Abstract

The application provides a rotating rectifying disc for a brushless exciter of a steam turbine generator and an assembling method thereof, and relates to the field of rotating rectifying discs for brushless exciters of steam turbine generators. The rotating rectifying disc comprises a rectifying ring, the rectifying ring is a whole forging structure, the edge of the rectifying ring is provided with a first mounting ring, the inner wall of the first mounting ring is uniformly provided with a radiator, the inside of the radiator is provided with a rotating diode, the axis of the rotating diode is parallel to the diameter of the rectifying ring, the rotating diode is electrically connected with a conductive row, the conductive row is arranged at the center position of the rectifying ring, the rectifying ring is detachably provided with a second mounting ring, and the inner wall of the second mounting ring is detachably provided with a protective resistor and a protective capacitor. The application can enhance the strength of the rectifying disc, is not prone to deformation in high-speed rotation, can prevent or reduce the deformation and falling of rectifying elements, and ensures the normal operation of the exciter.

Description

Technical Field

[0001] This invention relates to the field of rotating rectifier disks for brushless exciters of steam turbine generators, and particularly to a rotating rectifier disk for brushless exciters of steam turbine generators and its assembly method. Background Technology

[0002] A rotating rectifier disk is a device that converts the alternating current induced in the rotor windings of a brushless exciter into direct current. The rotating rectifier disk has rectifier components such as protective capacitors, protective resistors, and rotating diodes mounted on its end face. The maximum speed of a steam turbine generator's brushless exciter can reach 4800 r / min. The rotating rectifier disk rotates coaxially with the exciter. Such high speeds place higher demands on the structure of the rotating rectifier disk and the installation layout of the rectifier components. Existing rotating rectifier disks are multi-segment welded structures, which are prone to significant yielding and deformation under high-speed rotation. Simultaneously, the rectifier components are subjected to significant centrifugal force, making them susceptible to detachment and deformation, affecting the normal operation of the exciter. This not only increases installation and maintenance costs but can even lead to safety accidents involving the exciter. Therefore, existing rotating rectifier disks are not suitable for high-speed rotation alongside the steam turbine generator.

[0003] Therefore, given the current state of the existing technology, it is an urgent problem to develop a rotating rectifier disk for a brushless exciter of a steam turbine generator and its assembly method. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a rotating rectifier disk for a brushless exciter of a steam turbine generator and its assembly method, which can enhance the strength of the rectifier disk, prevent deformation during high-speed rotation, and prevent or reduce the deformation and detachment of rectifier components, thus helping to ensure the normal operation of the exciter.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a rotating rectifier disk for a brushless exciter of a steam turbine generator, comprising a rectifier ring, the rectifier ring being an integral forged structure, a first mounting ring being provided on the edge of the rectifier ring, a heat sink being uniformly provided on the inner wall of the first mounting ring, a rotating diode being provided inside the heat sink, the axis of the rotating diode being parallel to the diameter of the rectifier ring, the rotating diode being electrically connected to a conductive bus, the conductive bus being located at the center of the rectifier ring, a second mounting ring being detachably provided on the end face of the rectifier ring, and a protective resistor and a protective capacitor being detachably provided on the inner wall of the second mounting ring. By designing the rectifier ring as an integral structure, its strength is increased, making it less prone to deformation under high-speed rotation. Simultaneously, the first and second mounting rings allow the protective capacitor, protective resistor, and rotating diode to be mounted parallel to the direction of centrifugal force. Compared to the original direct mounting on the end face, this enhances the support for the protective capacitor, protective resistor, and rotating diode, preventing them from falling off. It also reduces the impact of centrifugal force on the deformation of the rectifier components. Overall, this rotating rectifier disk has a lower failure rate, which helps ensure the normal operation of the exciter.

[0006] Furthermore, a boss is provided at the end of the second mounting ring that connects to the rectifier ring, and a groove is provided at the corresponding position on the rectifier ring, with the boss and the groove fitting together with a clearance. The boss and groove improve installation accuracy and resist centrifugal force, preventing the second mounting ring from shifting under high-speed rotation.

[0007] Furthermore, the radiator is connected to the first mounting ring via countersunk bolts.

[0008] Furthermore, the first mounting ring is provided with ventilation holes, the axis of which is parallel to the axis of the rectifier ring. During rotation, the ventilation holes act as a cooling fan, eliminating the need for an additional welded blade fan. This simplifies manufacturing, significantly reduces the number of parts required, makes installation convenient and quick, and lowers subsequent maintenance costs.

[0009] Furthermore, an insulating layer is provided between the heat sink and the rectifier ring, and both the end of the heat sink in contact with the insulating layer and the insulating layer itself have an arc structure. This allows for better installation with the first mounting ring and provides better support and resistance to centrifugal forces.

[0010] Furthermore, the rotating diode is electrically connected to a busbar, which is provided with leads for electrically connecting to the exciter. Using a busbar instead of leads to connect to the rotating diode via bolts makes wiring more convenient.

[0011] Furthermore, three lead-out wires are provided, and these lead-out wires can be fixed to the motor shaft of the exciter with bolts. By reducing the number of lead-out wires and the use of bolts, the possibility of bolts flying out is reduced, thus lowering safety hazards.

[0012] Furthermore, both the protective resistor and the protective capacitor are provided with mounting bases. The mounting bases have an arc-shaped structure and can fit snugly against the inner wall of the second mounting ring. The mounting bases are installed on the second mounting ring using self-tapping screws. This allows for better installation with the second mounting ring, providing better support and resistance to centrifugal forces.

[0013] This invention also provides an assembly method for a rotating rectifier disk for a brushless exciter of a steam turbine generator. For the aforementioned rotating rectifier disk for a brushless exciter of a steam turbine generator, the method involves first installing the protective resistor and the protective capacitor on the second mounting ring, and then installing the second mounting ring on the rectifier ring. This method avoids omissions in the installation of the protective capacitor and the protective resistor, and facilitates integration, thereby improving assembly efficiency.

[0014] As can be seen from the above technical solutions, the present invention has the following advantages:

[0015] This solution provides a rotating rectifier disk and assembly method for a brushless exciter of a steam turbine generator. By setting the rectifier ring as an integral structure, the strength of the rectifier ring is increased, making it less prone to deformation under high-speed rotation. Simultaneously, the first and second mounting rings allow the protective capacitor, protective resistor, and rotating diode to be installed parallel to the direction of centrifugal force. Compared to the original method of directly mounting on the end face, this enhances the support for the protective capacitor, protective resistor, and rotating diode, preventing them from falling off, and reduces the impact of centrifugal force on the deformation of the rectifier components. Overall, this rotating rectifier disk has a lower failure rate, which is beneficial to ensuring the normal operation of the exciter. The bosses and grooves improve installation accuracy and resist centrifugal force in another direction, preventing the second mounting ring from shifting under high-speed rotation. During rotation, the ventilation holes act as a cooling fan, simplifying the overall structure. Wiring via the busbar is more convenient. The three lead wires reduce the use of bolts, lowering safety hazards. Attached Figure Description

[0016] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural diagram of a specific embodiment of the present invention. Figure 1 .

[0018] Figure 2 for Figure 1 Sectional view of AA.

[0019] Figure 3 This is a schematic diagram of the assembly structure of the rectifier ring, protection capacitor, and protection resistor in a specific embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the rectifier ring in a specific embodiment of the present invention.

[0021] In the diagram, 1 is the rectifier ring, 2 is the heat sink, 3 is the busbar, 4 is the rotating diode, 5 is the first mounting ring, 6 is the conductor bar, 7 is the second mounting ring, 8 is the protection capacitor, 9 is the protection resistor, 10 is the groove, 11 is the ventilation hole, and 12 is the countersunk hole. Detailed Implementation

[0022] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0023] like Figures 1 to 4As shown in the figure, this specific embodiment provides a rotating rectifier disk for a brushless exciter of a steam turbine generator, including a rectifier ring 1. The rectifier ring 1 is an integral forged structure. A first mounting ring 5 is provided on the edge of the rectifier ring 1. The inner wall of the first mounting ring 5 is provided with a countersunk hole 12. A radiator 2 is connected to the first mounting ring 5 by a countersunk bolt. An insulating layer is provided between the radiator 2 and the rectifier ring 1. Both the end of the radiator 2 in contact with the insulating layer and the insulating layer are arc-shaped structures. A rotating diode 4 is provided inside the radiator 2. The axis of the rotating diode 4 is parallel to the diameter of the rectifier ring 1. The rotating diode 4 is electrically connected to a conductive bus 6. The conductive bus 6 is installed at the center position of the rectifier ring 1 by bolts. A second mounting ring 7 is detachably provided on the end face of the rectifier ring 1 by bolts. The second mounting ring 7 has a boss at one end connected to the rectifier ring 1, and the rectifier ring 1 has a groove 10 at the corresponding position. The boss and the groove 10 are fitted with a clearance. A protective resistor 9 and a protective capacitor 8 are detachably installed on the inner wall of the second mounting ring 7. Both the protective resistor 9 and the protective capacitor 8 are provided with mounting seats. The mounting seats have an arc-shaped structure and can fit against the inner wall of the second mounting ring 7. The mounting seats are installed on the second mounting ring 7 by self-tapping screws. A ventilation hole 11 is provided on the first mounting ring 5. The axis of the ventilation hole 11 is parallel to the axis of the rectifier ring 1. The rotating diode is electrically connected to the busbar 3. The busbar 3 is electrically connected to the exciter through lead wires. There are three lead wires, which are fixed to the motor shaft of the exciter by bolts.

[0024] This specific embodiment also provides an assembly method for a rotating rectifier disk for a brushless exciter of a steam turbine generator. For the aforementioned rotating rectifier disk for a brushless exciter of a steam turbine generator, the protective resistor 9 and the protective capacitor 8 are first installed on the second mounting ring 7, and then the second mounting ring 7 is installed on the rectifier ring 1. This method can avoid omissions in the installation of the protective capacitor and the protective resistor, and is conducive to achieving integration and improving assembly efficiency.

[0025] As can be seen from the above specific embodiments, the present invention has the following beneficial effects:

[0026] 1. By setting the rectifier ring 1 as an integral structure, the strength of the rectifier ring 1 is increased, making it less prone to deformation under high-speed rotation. At the same time, through the first mounting ring 5 and the second mounting ring 7, the protective capacitor 8, the protective resistor 9, and the rotating diode 4 can be installed parallel to the direction of centrifugal force. Compared with the original form of directly mounting on the end face, this strengthens the support for the protective capacitor 8, the protective resistor 9, and the rotating diode 4, preventing them from falling off, and reduces the impact of centrifugal force on the deformation of the rectifier components. Overall, this rotating rectifier disk has a lower failure rate, which is conducive to ensuring the normal operation of the exciter. The boss and groove 10 improve the installation accuracy on the one hand, and resist centrifugal force in the other direction, preventing the second mounting ring 7 from shifting under high-speed rotation. During rotation, the ventilation hole 11 acts as a cooling fan, simplifying the overall structure.

[0027] 2. Wiring via busbar 3 is more convenient;

[0028] 3. Setting up three lead wires can reduce the use of bolts and reduce safety hazards.

[0029] The terms “upper,” “lower,” “outer,” “inner,” etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish relative positional relationships and are not necessarily qualitative. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion.

[0030] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rotating rectifier disk for a brushless exciter of a steam turbine generator, comprising a rectifier ring (1), characterized in that, The rectifier ring (1) is an integral forged structure. A first mounting ring (5) is provided on the edge of the rectifier ring (1). A heat sink (2) is uniformly provided on the inner wall of the first mounting ring (5). A rotating diode (4) is provided inside the heat sink (2). The axis of the rotating diode (4) is parallel to the diameter of the rectifier ring (1). The rotating diode (4) is electrically connected to a conductive bus (6). The conductive bus (6) is located at the center of the rectifier ring (1). A second mounting ring (7) is detachably provided on the end face of the rectifier ring (1). A protective resistor (9) is detachably provided on the inner wall of the second mounting ring (7). The second mounting ring (7) is provided with a boss at one end connected to the rectifier ring (1), and the rectifier ring (1) is provided with a groove (10) at the corresponding position, with the boss and the groove (10) in clearance fit; the first mounting ring (5) is provided with a ventilation hole (11), and the axis of the ventilation hole (11) is parallel to the diameter of the rectifier ring (1); the protection resistor (9) and the protection capacitor (8) are both provided with mounting seats, the mounting seats are arc-shaped structures, the mounting seats can fit against the inner wall of the second mounting ring (7), and the mounting seats are installed on the second mounting ring (7) by self-tapping screws.

2. The rotating rectifier disk for a brushless exciter of a steam turbine generator as described in claim 1, characterized in that, The radiator (2) is connected to the first mounting ring (5) by countersunk bolts.

3. The rotating rectifier disk for a brushless exciter of a steam turbine generator as described in claim 1, characterized in that, An insulating layer is provided between the heat sink (2) and the rectifier ring (1), and both the end of the heat sink (2) that contacts the insulating layer and the insulating layer are arc structures.

4. The rotating rectifier disk for a brushless exciter of a steam turbine generator as described in claim 1, characterized in that, The rotating diode is electrically connected to the bus (3), and the bus (3) is provided with a lead wire, which is used to electrically connect to the exciter.

5. The rotating rectifier disk for a brushless exciter of a steam turbine generator as described in claim 4, characterized in that, The lead wires are provided in three parts, and the lead wires can be fixed to the motor shaft of the exciter by bolts.

6. A method for assembling a rotating rectifier disk for a brushless exciter of a steam turbine generator, characterized in that, For a rotary rectifier disk for a brushless exciter of a steam turbine generator as described in any one of claims 1-5, the protective resistor (9) and the protective capacitor (8) are first installed on the second mounting ring (7), and then the second mounting ring (7) is installed on the rectifier ring (1).

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