High-speed large-voltage rotary rectifying element for 3,000-kilowatt brushless exciter

Abstract

The utility model discloses a high-speed large-voltage rotary rectifying element for a 3,000-kilowatt brushless exciter, which comprises a base, a ceramic ring is fixedly connected to the top of the base, an upper cover body is fixedly connected to the top of the ceramic ring, a positioning ring is mounted at the inner bottom of the base, a tube core is arranged in the positioning ring, and the upper cover body is fixedly connected to the inner bottom of the base. An electrode column is arranged on the upper end face of the tube core, a nut is in threaded connection with the outer surface of the electrode column, and a second flat gasket, a mica sheet, a first flat gasket, a belleville spring and a pressing pad are arranged in the base. According to the utility model, the insulating upper cover, the electrode column and the upper cover body are poured into a whole, so that when a lead is wound at the upper end of the insulating column and is fastened by another nut, the electrode column cannot rotate, thereby ensuring that the electrode column and a tube core cannot fall off due to excessive force when an external copper bar is connected; and therefore, the reliability of the part capable of bearing high centrifugal force at high rotating speed is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of rectifier elements, in particular to a high-speed and high-voltage rotating rectifier element for a 30,000-kilowatt brushless exciter. Background Art

[0002] The rotating rectifier element is mainly used in the rotating rectifier circuit of the synchronous generator exciter. Its main function is to convert the three-phase AC excitation current output by the AC exciter armature into DC current through the diode on the rectifier, and supply it to the rotor winding as the power supply for the excitation current. It is precisely because of the application of the rotating rectifier element that the AC synchronous generator has been freed from the shackles of brushes, and there is no longer the trouble of frequent maintenance and replacement of parts, which also makes the application of AC synchronous generators more extensive.

[0003] The existing rotating rectifier components are directly fixed and packaged in a split manner by using nuts to compress the insulating upper cover. If the nuts are tightened too much, the chip at the lower end of the electrode column base will fall off, which can easily cause the rotating rectifier component to fail. Secondly, since the components are set separately, they are not suitable for high-speed rotation conditions and cannot withstand higher centrifugal forces, so their service life is short. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a high-speed and high-voltage rotating rectifier element for a 30,000-kilowatt brushless exciter.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a high-speed and high-voltage rotating rectifier element for a 30,000-kilowatt brushless exciter, comprising a base, a ceramic ring is fixedly connected to the top of the base, an upper cover is fixedly connected to the top of the ceramic ring, a positioning ring is installed at the inner bottom of the base, a tube core is arranged inside the positioning ring, an electrode column is arranged on the upper end surface of the tube core, a nut is threadedly connected to the outer surface of the electrode column, and a second flat gasket, a mica sheet, a first flat gasket, a butterfly spring and a pressure pad are arranged inside the base.

[0006] As a further description of the above technical solution:

[0007] The second flat washer, the mica sheet, the first flat washer, the butterfly spring and the pressure washer are arranged in sequence from bottom to top, and the second flat washer, the mica sheet and the first flat washer are all sleeved on the outer surface of the electrode column.

[0008] As a further description of the above technical solution:

[0009] The electrode column is arranged in an inverted "T" shape, the lower surface of the cap body of the electrode column is fitted with the upper end surface of the tube core, and the lower surface of the second flat gasket is fitted with the upper surface of the cap body of the electrode column.

[0010] As a further description of the above technical solution:

[0011] The pressure pad is threadedly connected to the inner wall of the base, and the outer surface of the pressure pad is provided with an external thread matched with the inner wall of the base.

[0012] As a further description of the above technical solution:

[0013] The outer surface of the upper end of the electrode column is provided with an external thread matched with the nut.

[0014] As a further description of the above technical solution:

[0015] An insulating upper cover is cast on the outer sides of the upper cover body, the electrode column and the nut, and the nut is half-sunk on the upper surface of the insulating upper cover.

[0016] The utility model has the following beneficial effects:

[0017] 1. Compared with the existing technology, the 30,000-kilowatt brushless exciter uses a high-speed, high-voltage rotating rectifier element. The insulating upper cover, electrode column, and upper cover body are cast in one piece. In this way, when the lead is wrapped around the upper end of the insulating column and the lead is tightened with another nut, the electrode column will not rotate. This ensures that the electrode column and the tube core will not fall off due to excessive force when the copper bus is connected externally, thereby ensuring the reliability of the components being able to withstand high centrifugal forces at high speeds.

[0018] 2. Compared with the prior art, the 30,000-kilowatt brushless exciter uses a high-speed, high-voltage rotating rectifier element. By using a pressure pad, a butterfly spring, a first flat gasket, a mica sheet, and a second flat gasket to press on the upper surface of the cap body of the electrode column, and the lower surface of the cap body presses the tube core, the upward movement of the electrode column is further limited; the ceramic ring and the base, and the ceramic ring and the upper cover are respectively welded together by laser welding, which can further withstand the reliability of high centrifugal force. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view of the high-speed and high-voltage rotating rectifier element for the 30,000-kilowatt brushless exciter proposed by the utility model;

[0020] Figure 2 A cross-sectional view of a high-speed, high-voltage rotating rectifier element for a 30,000-kilowatt brushless exciter proposed in the utility model;

[0021] Figure 3 This is an exploded view of the high-speed and high-voltage rotating rectifier element for the 30,000-kilowatt brushless exciter proposed in the utility model.

[0022] Legend:

[0023] 1. Base; 2. Ceramic ring; 3. Upper cover; 4. Electrode column; 5. Pressure pad; 6. First flat gasket; 7. Second flat gasket; 8. Insulating upper cover; 9. Positioning ring; 10. Mica sheet; 11. Butterfly spring; 12. Tube core; 13. Nut. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Reference Figures 1 to 3 The utility model provides a high-speed and high-voltage rotating rectifier element for a 30,000-kilowatt brushless exciter: comprising a base 1, a ceramic ring 2 is fixedly connected to the top of the base 1, an upper cover 3 is fixedly connected to the top of the ceramic ring 2, a positioning ring 9 is installed on the inner bottom of the base 1, a tube core 12 is arranged inside the positioning ring 9, an electrode column 4 is arranged on the upper end surface of the tube core 12, a nut 13 is threadedly connected to the outer surface of the electrode column 4, the electrode column 4 is arranged in an inverted "T" shape, the lower surface of the cap body of the electrode column 4 is fitted with the upper end surface of the tube core 12, the lower surface of the second flat gasket 7 is fitted with the upper surface of the cap body of the electrode column 4, and the upper outer surface of the electrode column 4 is provided with an external thread matched with the nut 13;

[0026] The interior of the base 1 is provided with a second flat gasket 7, a mica sheet 10, a first flat gasket 6, a butterfly spring 11 and a pressure pad 5. The second flat gasket 7, the mica sheet 10, the first flat gasket 6, the butterfly spring 11 and the pressure pad 5 are arranged in sequence from bottom to top. The second flat gasket 7, the mica sheet 10 and the first flat gasket 6 are all sleeved on the outer surface of the electrode column 4. The pressure pad 5 is threadedly connected to the inner wall of the base 1. The outer surface of the pressure pad 5 is provided with an external thread adapted to the inner wall of the base 1. The electrode column 4 is pressed on the tube core 12. By using the pressure pad 5, the butterfly spring 11, the first flat gasket 6, the mica sheet 10 and the second flat gasket 7 to press on the upper surface of the cap body of the electrode column 4, the lower surface of the cap body presses the tube core 12, so that the upward movement of the electrode column 4 is further limited; the ceramic ring 2 and the base 1, the ceramic ring 2 and the upper cover 3 are respectively welded together by laser welding, and the reliability of being able to withstand high centrifugal force is further improved;

[0027] Reference Figure 2An insulating upper cover 8 is cast on the outer side of the upper cover body 3, the electrode column 4 and the nut 13. The nut 13 is half-sunk on the upper surface of the insulating upper cover 8. The insulating upper cover 8, the electrode column 4, the nut 13 and the upper cover body 3 are cast as one body. After casting, the nut 13 is half-sunk in the insulating upper cover 8. At the same time, the insulating upper cover 8, the electrode column 4 and the upper cover body 3 are cast as one body. In this way, when the lead wire is wound around the upper end of the insulating column and the lead wire is tightened with another nut, the electrode column 4 will not rotate.

[0028] Working principle:

[0029] When in use, the insulating upper cover 8, the electrode column 4, the nut 13 and the upper cover body 3 are cast together. After casting, the nut 13 is half-sunk in the insulating upper cover 8. At the same time, the insulating upper cover 8, the electrode column 4 and the upper cover body 3 are cast together. In this way, when the lead wire is wound around the upper end of the insulating column and the lead wire is fastened with another nut, the electrode column 4 will not rotate. In this way, it can be ensured that the electrode column 4 and the tube core 12 will not fall off due to excessive force when the copper bus is externally connected, thereby ensuring the reliability of the component being able to withstand high centrifugal force at high speed;

[0030] The interior of the ceramic ring 2 is filled with insulating silicone rubber, which is the same material as the insulating upper cover 8, to form an insulating spacer; the insulating spacer and the electrode column 4 are cast together again; the electrode column 4 is pressed on the tube core 12, and by using the pressure pad 5, the butterfly spring 11, the first flat gasket 6, the mica sheet 10, and the second flat gasket 7 to press on the upper surface of the cap body of the electrode column 4, and the lower surface of the cap body presses the tube core 12, which further limits the upward movement of the electrode column 4; the ceramic ring 2 and the base 1, the ceramic ring 2 and the upper cover 3 are respectively welded together by laser welding, which can further withstand the reliability of high centrifugal force.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

A high-speed, high-voltage rotating rectifier element for a 13,000-kW brushless exciter comprises a base (1) and is characterized in that: A ceramic ring (2) is fixedly connected to the top of the base (1), an upper cover (3) is fixedly connected to the top of the ceramic ring (2), a positioning ring (9) is installed on the inner bottom of the base (1), a tube core (12) is arranged inside the positioning ring (9), an electrode column (4) is arranged on the upper end surface of the tube core (12), a nut (13) is threadedly connected to the outer surface of the electrode column (4), and a second flat gasket (7), a mica sheet (10), a first flat gasket (6), a butterfly spring (11) and a pressure pad (5) are arranged inside the base (1).

2. The high-speed, high-voltage rotating rectifier element for a 30,000-kilowatt brushless exciter according to claim 1 is characterized in that: The second flat washer (7), the mica sheet (10), the first flat washer (6), the butterfly spring (11) and the pressure pad (5) are arranged in sequence from bottom to top, and the second flat washer (7), the mica sheet (10) and the first flat washer (6) are all sleeved on the outer surface of the electrode column (4).

3. The high-speed, high-voltage rotating rectifier element for a 30,000-kilowatt brushless exciter according to claim 1 is characterized in that: The electrode column (4) is arranged in an inverted "T" shape, the lower surface of the cap body of the electrode column (4) is in contact with the upper end surface of the tube core (12), and the lower surface of the second flat gasket (7) is in contact with the upper surface of the cap body of the electrode column (4).

4. The high-speed, high-voltage rotating rectifier element for a 30,000-kilowatt brushless exciter according to claim 1 is characterized in that: The pressure pad (5) is threadedly connected to the inner wall of the base (1); the outer surface of the pressure pad (5) is provided with an external thread that matches the inner wall of the base (1).

5. The high-speed, high-voltage rotating rectifier element for a 30,000-kilowatt brushless exciter according to claim 1 is characterized in that: The outer surface of the upper end of the electrode column (4) is provided with an external thread that matches the nut (13).

6. The high-speed, high-voltage rotating rectifier element for a 30,000-kilowatt brushless exciter according to claim 1 is characterized in that: An insulating upper cover (8) is cast and arranged outside the upper cover body (3), the electrode column (4) and the nut (13), and the nut (13) is semi-sunk on the upper surface of the insulating upper cover (8).

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