Rotor bracket structure of multi-phase outer pivot brushless exciter for nuclear power

Abstract

The invention discloses a multi-phase outer pivot brushless exciter rotor support structure for nuclear power, which belongs to the field of brushless exciters and is composed of a rotor support body, a connecting plate and a radial support ring. The invention aims to solve the problems of large deformation, large rotation vibration, poor strength performance, poor sealing performance and the like caused by the fact that only one end of a cantilever type rotor bracket of a conventional external pivot brushless exciter for nuclear power is used for supporting. The rotor support structure has the advantages of being high in bearing capacity, good in stability, simple and firm in structure, good in ventilation effect, good in sealing performance and the like.

Description

Technical Field

[0001] The invention relates to the field of brushless exciters, and in particular to a rotor support structure of a multi-phase external pivot brushless exciter for nuclear power. Background Art

[0002] The excitation system is an indispensable part of the auxiliary equipment of the generator. An excitation system with excellent performance can not only ensure the constant voltage at the machine end, but also improve the stability of the generator and the power system. The brushless excitation system composed of an AC exciter and a rotating rectifier has the advantages of fast excitation regulation speed and voltage rise speed, and has no brush device, which avoids the pollution of stator and rotor coils by carbon powder. It is the most widely used excitation method in the existing excitation system. The external pivot brushless exciter has the characteristics of a brushless excitation system and also has the advantages of high power density, high torque, and high efficiency. With the continuous increase in the capacity of generators, especially in nuclear power million-kilowatt steam turbine generators, the capacity of the external pivot brushless exciter is getting larger and larger, and the requirements for the rotor bracket of the external pivot brushless exciter are getting higher and higher. The end face of one side of the traditional cantilever rotor bracket is connected to the main shaft of the generator. Since the cantilever rotor bracket needs to be equipped with a rotating rectifier and an AC exciter, the axial length of the cantilever rotor bracket increases, the deflection of the shaft system increases, resulting in poor vibration stability, poor sealing under high temperature and high speed conditions, and the resulting external pivot brushless exciter produces abnormal vibration, noise and accelerated wear of seals during operation. Frequent shutdowns for maintenance can increase maintenance costs and affect production progress and economic benefits. Summary of the invention

[0003] In view of this, the present invention discloses a rotor bracket structure of a multi-phase external pivot brushless exciter for nuclear power. This rotor bracket structure is based on the traditional cantilever rotor bracket structure, and a circular support ring plate, a radial support ring plate and rectangular ribs are added inside the rotor bracket, which greatly improves the strength and stability of the rotor bracket, thereby ensuring the normal operation and long-term use of the excitation equipment.

[0004] The technical solution of the present invention is as follows: the rotor support structure consists of a rotor support body, a connecting plate and a radial support ring; the rotor support body is assembled into a whole with the connecting plate and the radial support ring respectively by bolts; the entire rotor support is assembled with the rotating shaft of the nuclear power host by the connecting plate; the rotating rectifier is fastened to the rotor support body by a pair of short flat keys; the radial support ring is fastened to the rotor support body by bolts; and the AC exciter is fastened to the rotor support body by a pair of long flat keys.

[0005] In the above-mentioned rotor bracket structure of the multi-phase external pivot brushless exciter for nuclear power, a circular support ring plate is arranged near the middle of the inner side of the rotor bracket body. In order to meet the installation and cooling requirements, a large circular hole is opened in the middle of the circular support ring plate. In order to meet the cooling requirements, multiple axial ventilation circular holes are opened outside the large circular hole in the middle of the circular support ring plate. In order to meet the wiring requirements, multiple square holes are opened outside the axial ventilation circular holes of the circular support ring plate. The rotor bracket body is bounded by the circular support ring plate. A pair of short flat keys are installed on one side to cooperate with the rotating rectifier, and multiple groups of rectangular grooves and threaded holes on the grooves are opened. A pair of long flat keys are opened on the other side to cooperate with the AC exciter. A large counterweight groove for placing a balancing block and a double-layer wind shield boss arranged near the end are opened near the middle of the outer side of the rotor bracket body. A screw hole engaged with the connecting plate is opened on one end face of the rotor bracket body, and a small counterweight groove for placing a balancing block is opened on the other end face.

[0006] In the above-mentioned rotor bracket structure of the multi-phase external pivot brushless exciter for nuclear power, a large circular hole is opened in the middle of the radial support ring plate to meet the installation and cooling requirements, and multiple groups of rectangular bosses are radially arranged to cooperate with the rectangular grooves on the rotor bracket body. In order to meet the cooling requirements, a rectangular square hole is opened in the middle part of the rectangular boss, and a screw hole with a certain depth is opened on the outer edge of the rectangular boss for use when assembling with the rotor bracket body.

[0007] In the above-mentioned multi-phase external armature brushless exciter rotor bracket structure for nuclear power, the armature winding lead wire of the AC exciter passes through the square hole on the circular support ring plate in the middle of the rotor bracket body and is connected to the rectifier connecting block located below the radial support ring. The rectifier connecting block is connected to the input terminal of the rotating rectifier through a connecting plate, and the positive and negative conductive plates at the output end of the rotating rectifier are connected to the positive and negative conductive rods in the nuclear power main engine shaft.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] 1. The present invention is composed of a rotor support body, a connecting plate and a radial support ring plate. The circular support ring near the middle of the inner side of the rotor support body is provided with a radial support ring plate on one side and multiple groups of rectangular ribs on the other side as support, which can effectively control the deformation of the rotor support and improve the strength of the rotor support.

[0010] 2. A circular ventilation hole and a square threading hole are provided on the circular support ring plate near the middle of the inner side of the rotor bracket body. The large circular hole in the middle of the circular support ring plate can meet the requirements of installation and axial ventilation. The axial ventilation circular holes provided on the circular support ring plate can meet the requirements of axially taking away the inner surface loss of the AC exciter and the rotating rectifier at a close distance. The square holes on the circular support ring plate can effectively support the lead-out wires of the armature winding of the AC exciter, protecting it from damage and breakage under high-speed rotation.

[0011] 3. The large counterweight slot on the outside of the rotor support body and the small counterweight slot on one end can meet the requirements of multi-position counterweights at different distances and angles of the rotor. The double-layer windshield boss near the end of the rotor support body can effectively control the flow direction of the wind, reduce wind resistance, and improve the utilization rate of cooling air.

[0012] 4. The outer surface of the rectifier connecting block is tightly attached to the inner circle of the radial support ring plate. When the entire rotor rotates at high speed, the rectifier connecting block will be subjected to radial force on the radial support ring plate under the action of centrifugal force. The radial support ring plate and the rotor bracket body are fastened into a whole, which can effectively protect the rectifier connecting block from radial displacement and damage and fracture. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a cross-sectional view of the rotor assembly using a rotor bracket structure.

[0014] Figure 2 AA cross-sectional view of the rotor assembly using the rotor bracket structure.

[0015] Figure 3 This is a three-dimensional diagram of the rotor bracket structure of a multi-phase external armature brushless exciter for nuclear power.

[0016] Figure 4 This is a two-dimensional cross-sectional view of the rotor bracket structure of a multi-phase external armature brushless exciter for nuclear power.

[0017] Figure 5 This is a cross-sectional view of the rotor support body.

[0018] Figure 6 This is a two-dimensional diagram of the connecting plate.

[0019] Figure 7 It is a two-dimensional diagram of the radial support ring plate.

[0020] Markings in the figure: 1-rotor bracket body; 2-connecting plate; 3-radial support ring plate; 4-rotating shaft; 5-rotating rectifier; 6-short flat key; 7-AC exciter; 8-long flat key; 9-circular support ring plate; 10-axial ventilation circular hole; 11-armature winding lead wire; 12-square hole; 13-rectangular rib; 14-rectangular groove; 15-large counterweight groove; 16-double-layer wind shield boss; 17-multiple sets of screw holes; 18-rectangular boss; 19-rectangular square hole; 20-light hole; 21-screw hole; 22-small counterweight groove; 23-rectifier connection block; 24-connecting piece; 25-input terminal; 26-positive and negative conductive plates; 27-positive and negative conductive rods. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figure 1 to Figure 7 As shown, a rotor support structure of a multi-phase external pivot brushless exciter for nuclear power is composed of a rotor support body 1, a connecting plate 2 and a radial support ring 3. The rotor support body 1 is fixed to the connecting plate 2 and the radial support ring 3 as a whole through bolts, and the entire rotor support is fixed to the rotating shaft 4 of the nuclear power host through the connecting plate 2. The rotating rectifier 5 is fastened to the rotor support body 1 as a whole through a pair of short flat keys 6, the radial support ring 3 is fastened to the rotor support body 1 as a whole through bolts, and the AC exciter 7 is fastened to the rotor support body 1 as a whole through a pair of long flat keys 8.

[0023] like Figure 1 , Figure 2 , Figure 4 As shown, a circular support ring plate 9 is provided near the middle of the inner side of the rotor support body 1. In order to meet the installation and cooling requirements, a large circular hole is opened in the middle of the circular support ring plate 9. In order to meet the cooling requirements, an axial ventilation circular hole 10 is opened outside the large circular hole in the middle of the circular support ring plate 9. In order to meet the wiring requirements, a square hole 12 is opened outside the axial ventilation circular hole 10 of the circular support ring plate 9. The rotor support body 1 is bounded by the circular support ring plate 9. A pair of short flat keys 6 are installed on one side to cooperate with the rotating rectifier 5. A plurality of groups of rectangular grooves 14 and a plurality of groups of screw holes 17 on the grooves are also provided. A pair of long flat keys 8 are provided on the other side to cooperate with the AC exciter 7. A large counterweight groove 15 for placing a balancing block and a double-layer windshield boss 16 arranged near the end are provided near the middle of the outer side of the rotor support body 1. A screw hole 21 engaged with the connecting plate is provided on one end surface of the rotor support body 1, and a small counterweight groove 22 for placing a balancing block is provided on the other end surface.

[0024] like Figure 1 , Figure 2 , Figure 7 As shown, a large circular hole is opened in the middle of the radial support ring plate 3, and multiple groups of rectangular bosses 18 are radially arranged to cooperate with the rectangular grooves 14 on the rotor support body 1. In order to meet the cooling requirements, a rectangular square hole 19 is opened in the middle part of the rectangular boss 18, and a screw hole with a certain depth is opened on the outer edge of the rectangular boss 18 for use when assembling with the rotor support body 1.

[0025] like Figure 1 , Figure 2As shown, the armature winding lead wire 11 of the AC exciter 7 passes through the square hole 12 on the circular support ring plate 9 in the middle of the rotor bracket body 1 and is connected to the rectifier connecting block 23 located below the radial support ring 3. The rectifier connecting block 23 is connected to the input terminal 25 of the rotating rectifier 5 through the connecting piece 24, and the positive and negative conductive plates 26 at the output end of the rotating rectifier 5 are connected to the positive and negative conductive rods 27 in the nuclear power host shaft 4.

[0026] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, it should be clear to those skilled in the art that the technical solutions described in the above embodiments may be modified, or some or all of the technical features therein may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-phase external armature brushless exciter rotor support structure for nuclear power, characterized by: The invention is composed of a rotor support body (1), a connecting plate (2) and a radial support ring (3); the rotor support body (1) is fixed to the connecting plate (2) and the radial support ring (3) by bolts to form a whole; the entire rotor support is fixed to the rotating shaft (4) of the nuclear power host by the connecting plate (2); the rotating rectifier (5) is fastened to the rotor support body (1) by a pair of short flat keys (6); the radial support ring (3) is fastened to the rotor support body (1) by bolts; and the AC exciter (7) is fastened to the rotor support body (1) by a pair of long flat keys (8).

2. The rotor support structure of a multi-phase external armature brushless exciter for nuclear power according to claim 1 is characterized by: A circular support ring plate (9) is arranged near the center of the inner side of the rotor support body (1), axial ventilation holes (10) are evenly distributed on the circular support ring plate (9) in the circumferential direction, and square holes (12) are evenly distributed on the outer side of the axial ventilation holes (10). A plurality of rectangular ribs (13) are evenly distributed on the circumference of the inner side of the rotor support body (1) close to the AC exciter (7), and a plurality of rectangular grooves (14) are evenly distributed on the circumference of the inner side of the rotor support body (1) close to the rotating rectifier (5). A large counterweight groove (15) is provided along the circumferential direction and a plurality of groups of screw holes (17) are evenly distributed along the circumference near the center of the outer side of the rotor support body (1). A double-layer windshield boss (16) is arranged near the outer end of the rotor support body (1). A screw hole (21) for fixing with the connecting plate (2) is provided at one end of the rotor support body (1), and a small counterweight groove (22) is provided on the other end surface.

3. The rotor support structure of a multi-phase external armature brushless exciter for nuclear power according to claim 1 is characterized by: The radial support ring (3) has multiple groups of rectangular bosses (18) evenly distributed in the circumferential direction, each rectangular boss (18) has a rectangular square hole (19) in the middle, and each rectangular boss (18) has four parallel light holes (20) on the outer edge.

4. The rotor support structure of a multi-phase external armature brushless exciter for nuclear power according to claim 1 is characterized by: The armature winding lead wire (11) of the AC exciter (7) passes through the square hole (12) on the circular support ring plate (9) and is connected to the rectifier connection block (23) located below the radial support ring (3); the rectifier connection block (23) is connected to the input terminal (25) of the rotating rectifier (5) through a connecting piece (24); and the positive and negative conductive plates (26) at the output end of the rotating rectifier (5) are connected to the positive and negative conductive rods (27) in the nuclear power host shaft.

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