Filtering assembly for electron accelerator
By designing a filter unit with a gap structure in the filter component, insulation failure and excessive concentration of electric field are avoided, the insulation and voltage breakdown problems of traditional high-voltage capacitor filters are solved, and the withstand voltage value and service life are improved.
Patent Information
- Application Number
- CN202323602835.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-28
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2033-12-28
AI Technical Summary
Traditional high-voltage capacitor filters are prone to insulating failure and electric field being too concentrated in high voltage operation, resulting in shell swelling, oil leakage, voltage breakdown, and damage.
The filtering component design includes a bottom plate and a top plate. The filtering unit contains a parallel capacitor group and resistor on the printed circuit board, the shielding electrode is connected to the screws and nuts, and the gap design avoids insulation and electric field concentration.
The insulation and heat dissipation effect are achieved through the gap design, which avoids insulation failure and voltage breakdown, increases the withstand voltage value, and extends the service life of the high-voltage capacitor filter.
Smart Images
Figure CN222339663U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a filter assembly, specifically, a filter assembly for a high-voltage capacitor filter, and is particularly suitable for a filter in an electron accelerator power supply. Background Art
[0002] It is well known in the field of high-voltage capacitor filter production that the high-voltage capacitors of traditional high-voltage capacitor filters are mainly of the following two types: one is formed by winding a thin film dielectric and then placing it in a shell, and then injecting capacitor oil to encapsulate it. Because the high-voltage capacitor will generate heat itself under high-voltage operation, the pressure inside the shell increases. As the pressure increases, the shell is prone to bursting and leaking oil, and the insulation fails; the other is also wound with a thin film dielectric and then placed in the shell, but the insulation is cast with epoxy resin. Although epoxy resin casting can play an insulating role, the heat dissipation effect is poor. As the temperature rises, epoxy resin is easy to expand and easily cause insulation failure. In addition, since the above two types of high-voltage capacitors are wound with multiple layers of thin film dielectrics, when working, it is easy to cause the electric field to be too concentrated, resulting in voltage breakdown and damage to the high-voltage capacitor filter. Utility Model Content
[0003] The problem to be solved by the utility model is to overcome the above-mentioned shortcomings and provide a filter assembly for an electron accelerator. The utility model can avoid insulation failure and damage to the high-voltage capacitor filter.
[0004] The above-mentioned problems to be solved by the utility model are achieved by the following technical solutions:
[0005] The filter assembly for electron accelerator of the utility model is characterized in that it comprises a bottom plate and a top plate, and at least two filter units are arranged between the bottom plate and the top plate. The filter units all contain a printed circuit board, and the printed circuit board has two capacitor groups. The capacitor groups are all formed by a resistor and at least two capacitors connected in parallel, and one end of the capacitor groups is connected together. A pair of opposite sides of the printed circuit board are connected with shielding electrodes, and the two shielding electrodes are respectively connected with the other ends of the two capacitor groups. The shielding electrodes are connected with screws and nuts. A pair of corresponding shielding electrodes between adjacent filter units are connected together in an alternating manner from bottom to top. The printed circuit boards of adjacent filter units are connected with a padding column, so that a first gap is left between the shielding electrodes of adjacent filter units. The printed circuit board has a central hole, and a pillar is inserted into the central hole. The upper and lower ends of the pillar are respectively connected with the top plate and the bottom plate.
[0006] The shielding electrodes are all arc-shaped, formed by bending metal strips, and their arc openings are arranged opposite to each other with a second gap between them.
[0007] The shielding electrode may also be a pentagon formed by bending a metal strip, which has three equal-length portions and two side portions, and the lengths of the side portions are all smaller than the equal-length portions. The arc openings of the shielding electrode are arranged opposite to each other and a second gap is left between the arc openings.
[0008] It can be seen from the above scheme that since the utility model includes a bottom plate and a top plate, there are at least two filter units between the bottom plate and the top plate. The filter units all contain a printed circuit board, and there are two capacitor groups on the printed circuit board. The capacitor groups are all formed by a resistor and at least two capacitors in parallel, and one end of them is connected together. A pair of opposite sides of the printed circuit board are connected with shielding electrodes, and the two shielding electrodes are respectively connected with the other ends of the two capacitor groups. The shielding electrodes are connected with screws and nuts. A pair of corresponding shielding electrodes between adjacent filter units are connected together in an alternating shape from bottom to top. A padding column is connected between the printed circuit boards of adjacent filter units, so that a first gap is left between the shielding electrodes of adjacent filter units. The printed circuit boards all have a central hole, and a pillar is inserted into the central hole. The upper and lower ends of the pillar are connected to the top plate and the bottom plate respectively. With the above structure, gaps can be left between the bottom plate and the top plate and adjacent filter units, between adjacent filter units, between resistors and capacitors, between capacitors, and between capacitor groups and shielding electrodes. Compared with the background technology, neither transformer oil nor epoxy resin packaging and insulation are needed. The gaps between the bottom plate and the top plate and the adjacent filter units, between the adjacent filter units, between the resistors and the capacitors, between the capacitors, and between the capacitor group and the shielding electrode are used to achieve insulation, thereby avoiding the occurrence of insulation failure. In addition, because gaps are left between the bottom plate and the top plate and the adjacent filter units, between the adjacent filter units, between the resistors and the capacitors, between the capacitors, and between the capacitor group and the shielding electrode, compared with the background technology, epoxy resin packaging is not needed, thereby avoiding the occurrence of excessive concentration of electric fields, voltage breakdown, and damage to high-voltage capacitor filters. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a filter component for an electron accelerator of the utility model;
[0010] Figure 2 yes Figure 1 A right side schematic diagram of
[0011] Figure 3 yes Figure 1 Schematic diagram of a top view of the filter unit;
[0012] Figure 4 yes Figure 3 Schematic diagram of the top view. DETAILED DESCRIPTION
[0013] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the filter assembly for electron accelerator of the utility model comprises a bottom plate 1 and a top plate 7, and a plurality of filter units 5 are arranged between the bottom plate 1 and the top plate 7. The number of the filter units 5 depends on the voltage of the high-voltage capacitor filter. In this embodiment, there are eight filter units.
[0014] The filter units 5 each include a printed circuit board, and the printed circuit board includes an insulating plate 21. The insulating plate 21 is circular, and a frame-shaped conductive film strip 19 is printed in the middle of its lower surface. The frame-shaped conductive film strip 19 is a rectangular frame, and eight small holes are evenly distributed on its two long film strips 191. Strip-shaped conductive film strips 20 are printed outside the two long film strips 191. The two strip-shaped conductive film strips 20 are evenly processed with eight small holes, and the eight small holes correspond to the eight small holes on the two long film strips 191 on the frame-shaped conductive film strip 19.
[0015] Two capacitor groups are arranged on the printed circuit board. Both capacitor groups are formed by a resistor and seven capacitors connected in parallel. Among them, one end of the resistor 15 and seven capacitors 16 in one capacitor group passes through eight small holes on a long film strip 191 of the frame-shaped conductive film strip 19 and is welded on a long film strip 191 of the frame-shaped conductive film strip 19, and the other ends thereof pass through eight small holes on an adjacent strip-shaped conductive film strip 20 and are welded on the corresponding strip-shaped conductive film strip 20. One end of the resistor 15 and seven capacitors 16 in another capacitor group passes through eight small holes on another long film strip 191 of the frame-shaped conductive film strip 19 and is welded on another long film strip 191 of the frame-shaped conductive film strip 19, and the other ends thereof pass through eight small holes on an adjacent strip-shaped conductive film strip 20 and are welded on the strip-shaped conductive film strip 20. Thus, the seven capacitors 16 and one resistor 15 in the two capacitor groups are connected in parallel first and then in series.
[0016] Shielding electrodes are connected to a pair of opposite sides of the printed circuit board, and connecting blocks 17 are arranged between the two shielding electrodes and the corresponding sides of the printed circuit board; nail holes are processed on the shielding electrodes, and screws 13 and nuts 4 are arranged in the nail holes. The connecting block 17 is an L-shaped plate, and its vertical part is connected to the corresponding shielding electrode through screws 13 and nuts 4, and its horizontal part is connected to the corresponding strip-shaped conductive film strip 20 through screws 13 and nuts 4.
[0017] The shielding electrodes may be arc-shaped, and are formed by bending metal strips, with their arc openings arranged opposite to each other and a second gap 6 left between them.
[0018] The shielding electrode may also be a pentagon formed by bending a metal strip, which includes three equal-length portions 2 and two side portions 3, wherein the length of the side portion 3 is half of the equal-length portion 2. The arc openings of the shielding electrode are arranged opposite to each other with a second gap 6 therebetween.
[0019] Counting upward from the bottom filter unit 5 , a pair of corresponding shielding electrodes between the first filter unit 5 and the second filter unit 5 are connected together by means of screws 13 , nuts 4 and connecting sheets 14 .
[0020] The shielding electrode of the second filter unit 5 that is not connected to the first filter unit 5 is also connected to the corresponding shielding electrode of the third filter unit 5 by means of the screw 13, the nut 4 and the connecting piece 14. After that, by analogy, a pair of corresponding shielding electrodes of two adjacent filter units 5 are connected alternately from bottom to top, and finally all the filter units 5 are connected in series, which greatly improves the withstand voltage value of the utility model.
[0021] A heightening column is provided between the printed circuit boards between adjacent filter units 5, and both ends of the heightening column are connected to the printed circuit boards of the adjacent filter units 5 by means of screws, so that a first gap 9 is left between the adjacent filter units 5. In order to achieve the fixation and positioning between the filter units 5, the printed circuit boards are processed with center holes, and the center holes are penetrated with pillars 11. The upper and lower ends of the pillars 11 are connected to the top plate 7 and the bottom plate 1 respectively by means of screws.
Claims
1. A filter assembly for an electron accelerator, characterized in that: The invention comprises a bottom plate (1) and a top plate (7), wherein at least two filter units (5) are arranged between the bottom plate (1) and the top plate (7); each of the filter units (5) comprises a printed circuit board, and the printed circuit board has two capacitor groups; each of the capacitor groups is formed by a resistor (15) and at least two capacitors (16) connected in parallel, and one end of each of the capacitor groups is connected together; each of a pair of opposite sides of the printed circuit board is connected with shielding electrodes, and the two shielding electrodes are respectively connected with the other ends of the two capacitor groups; each of the shielding electrodes is connected with a screw (13) and a nut (4); a pair of corresponding shielding electrodes between adjacent filter units (5) are connected together in an alternating manner from bottom to top; each of the printed circuit boards of adjacent filter units (5) is connected with a heightening column (10), so that a first gap (9) is left between the shielding electrodes of adjacent filter units (5); each of the printed circuit boards has a central hole, and a pillar (11) is inserted into the central hole; and the upper and lower ends of the pillar (11) are respectively connected with the top plate (7) and the bottom plate (1).
2. The filter assembly for electron accelerator according to claim 1, characterized in that: The shielding electrodes are all arc-shaped and are formed by bending metal strips. Their arc openings are arranged opposite to each other and a second gap (6) is left between them.
3. The filter assembly for electron accelerator according to claim 1, characterized in that: The shielding electrode is a pentagon formed by bending a metal strip, comprising three equal-length portions (2) and two side portions (3), wherein the lengths of the side portions (3) are all smaller than the equal-length portions (2); the arc openings of the shielding electrode are arranged relative to each other and a second gap (6) is left between the two.