Direct-current filter capacitor applied to aviation field

Abstract

The invention discloses a direct-current filter capacitor applied to the aviation field, and the capacitor upper and lower cover conductive copper bar group adopts a composite copper bar structure of which the upper and lower covers are mutually closed, and the capacitor upper cover conductive copper bar group is provided with an upper cover conductive copper bar group and a copper upper cover structure which is downwards and vertically turned over; the capacitor lower cover conductive copper bar group is provided with a lower cover conductive copper bar group and a copper lower cover structure which is upwards and vertically turned over, the capacitor packaging shell is provided with a bottom shell and a shell side wall structure which is upwards and vertically turned over from the periphery of the bottom shell, and the capacitor inner core group is distributed in a closed cover cavity which is formed after the upper part and the lower part of the closed cover cavity are mutually closed; the whole interior of the closed cover cavity is of a cylindrical cavity structure, the closed capacitor upper cover conductive copper bar set and the closed capacitor lower cover conductive copper bar set are provided with capacitor leading-out positive and negative electrode conductive copper bar sets which are led out upwards, and capacitor positive and negative electrode leading-out end insulation blocks are arranged outside a bottom shell of the capacitor packaging shell. The special strict requirements of high stability and reliability of electric work, long service life, low aging rate and the like are better met, and the service life safety is improved.

Description

Technical Field

[0001] The present invention relates to a filter capacitor, and in particular to an aviation direct current filter capacitor used in the aviation and aerospace fields. Background Art

[0002] Filter capacitors are widely used in various product equipment technologies. Similarly, in the aviation field, such as aircraft engine ignition systems, power systems, and aircraft airborne electronic equipment, there is a need to use filter capacitors in avionics technology applications. The aviation application field itself has special and strict requirements. When used in avionics technology, if one of the components fails, the entire device or system will also fail. Similarly, as filter capacitors used in many electronic devices in aviation applications, the filter capacitors themselves are also required to meet special and strict requirements such as stable and reliable operation, long service life, and low aging rate. Patent No. ZL 201710764707.3, published on November 21, 2017, discloses a supercapacitor core reinforcement structure, including a capacitor core [1], a capacitor shell and a core support [3]; the capacitor shell includes a cylindrical side wall and a cylindrical bottom surface; it belongs to the field of avionics technology, especially to aircraft-borne electronic equipment used in strong vibration environments. The present invention adds a support frame to the bottom of the supercapacitor shell to prevent the aluminum shell from deforming under severe temperature shocks, and to continuously tighten the internal core to avoid the shaking of the internal core under long-term strong vibrations, resulting in the breakage of the electrode connecting piece. This solution mechanically reinforces the single-core single-electrode structure of the capacitor core, but this solution does not make improvements to meet special and strict requirements such as high electrical working stability and reliability, long service life and low aging rate. Summary of the invention

[0003] The present invention aims to solve the problem that the existing filter capacitors used in the aviation field have special and strict requirements. Once a fault occurs, the entire device or system will also fail, resulting in potential safety hazards. The present invention provides a DC filter capacitor used in the aviation field that can better meet the special and strict requirements of high electrical working stability and reliability, long service life and low aging rate, and improve service life safety.

[0004] The specific technical solution adopted by the present invention to solve the above technical problems is: a DC filter capacitor used in the aviation field, characterized in that: it includes a capacitor upper cover conductive copper bar group, a capacitor lower cover conductive copper bar group, a capacitor inner core group and a capacitor packaging shell, the capacitor upper cover conductive copper bar group and the capacitor lower cover conductive copper bar group adopt a composite copper bar structure that covers each other from top to bottom, the capacitor upper cover conductive copper bar group has an upper cover conductive copper bar group and a copper upper cover structure that is folded vertically downward, the upper cover conductive copper bar group connection end is distributed at the outer periphery of the copper upper cover, the capacitor lower cover conductive copper bar group has a lower cover conductive copper bar group and a copper lower cover structure that is folded vertically upward, and the lower cover conductive copper bar group Arranged at the periphery of the copper lower cover, the capacitor packaging shell has a bottom shell and a shell side wall structure vertically folded upward from the periphery of the bottom shell, the capacitor core group is distributed inside the combined cover cavity of the capacitor upper cover conductive copper bar group and the capacitor lower cover conductive copper bar group after the upper and lower covers are closed to each other, the interior of the closed cavity is a cylindrical cavity structure as a whole, the capacitor upper cover conductive copper bar group and the capacitor lower cover conductive copper bar group after the covers are closed have a capacitor lead-out positive and negative conductive copper bar group leading upward, the outside of the bottom shell of the capacitor packaging shell is provided with capacitor positive and negative lead-out terminal insulating blocks, and the capacitor positive and negative lead-out terminal insulating blocks are respectively arranged and distributed with a plurality of capacitor positive and negative terminals electrically connected from the bottom shell. By configuring the filter capacitor with a composite copper busbar structure that covers each other from top to bottom, the inner core group of the capacitor can be safely and effectively positioned and fixed to form a capacitor core group to achieve more continuous tightness of the internal core, thereby improving the seismic stability, reliability and effectiveness of the internal core of the capacitor; and a composite conductive heat dissipation copper busbar structure is formed by the capacitor upper cover conductive copper busbar group and the capacitor lower cover conductive copper busbar group, providing the filter capacitor with stable, reliable and effective working electrode lead-out and heat dissipation reliability and effectiveness, which can better meet the special and strict requirements of the filtrate capacitor in the field of aviation applications, such as high electrical stability and reliability, long service life and low aging rate, thereby improving service life safety.

[0005] Preferably, the capacitor upper cover conductive copper bar group comprises a first upper cover conductive copper bar group, a second upper cover conductive copper bar group, a copper upper cover and an upper cover vertical wall extending from the outer periphery of the copper upper cover and folded downward vertically, wherein the first upper cover conductive sheet group adopts a plurality of upper cover conductive copper bars arranged at intervals and distributed on the outer side of the upper cover vertical wall, and the upper end of the conductive copper bar of the first upper cover conductive copper bar group is higher than the height position of the copper upper cover and the height position of the epoxy packaging surface of the capacitor; the number of conductive sheets of the second upper cover conductive copper bar group is less than the number of conductive sheets of the first upper cover conductive copper bar group , the second upper cover conductive copper bar group includes a first conductive connection segment, a second conductive connection segment and a third conductive connection segment which are sequentially extended and connected, wherein the end of the first conductive connection segment is connected to the outer peripheral edge of the copper upper cover, the second conductive connection segment is vertically folded downward from the first conductive connection segment and extends to the position below the bottom end of the upper cover vertical wall, the third conductive connection segment is folded inward from the second conductive connection segment and extends to the bottom of the copper upper cover, and the third conductive connection segment is parallel to the copper upper cover surface, and the copper upper cover as a whole is a circular or polygonal structure close to a circular shape. Improving the capacitor upper cover conductive copper bar group provides stable and reliable effectiveness and reliable effectiveness of working electrode extraction and heat dissipation for the filter capacitor, improving the tightness and heat dissipation effectiveness of the internal core of the capacitor, and can better meet the special and strict requirements of the filtrate capacitor in the field of aviation applications, such as high electrical stability and reliability, long service life and low aging rate, and improve service life safety. Compounding the magnetic field as much as possible, reducing stray inductance, reducing the use of absorption capacitors, and improving the working quality of the filter capacitor.

[0006] Preferably, the capacitor lower cover conductive copper bar group comprises a first lower cover conductive copper bar group, a second lower cover conductive copper bar and a copper lower cover, one end of the first lower cover conductive copper bar group is connected and fixed to the copper lower cover, the copper lower cover has a groove notch recessed from the outer periphery of the lower cover to the center, the second lower cover conductive copper bar has an L-shaped structure as a whole, wherein the end head of the long conductive copper bar segment of the L-shaped structure is connected and fixed to the inner end cover body of the notch of the groove notch, the short conductive copper bar segment of the L-shaped structure is vertically folded upward to form a lower conductive copper bar group that is distributed and connected with the first lower cover conductive sheet group and arranged on the outer periphery of the copper lower cover, and the copper lower cover is a circular or polygonal structure close to a circular shape. Improving the capacitor lower cover conductive copper bar group provides stable and reliable effectiveness and reliable effectiveness of heat dissipation for the working electrode lead-out of the filter capacitor, improving the tightness and heat dissipation effectiveness of the internal core of the capacitor, can better meet the special and strict requirements of the filtrate capacitor in the field of aviation applications, such as high electrical stability and reliability, long service life and low aging rate, and improve service life safety. The magnetic field is compounded as much as possible, the stray inductance is reduced, the use of absorption capacitance is reduced, and the working quality of the filter capacitor is improved.

[0007] Preferably, the capacitor packaging shell comprises a shell bottom and a shell wall, the shell bottom is circular in shape, the shell wall is vertically folded and extended upward from the outer periphery of the shell bottom to form a packaging shell structure with an open shell top opening, the shell wall adopts a multi-section concave-convex wall structure, the shell wall is annularly connected and arranged at the outer periphery of the shell bottom, and the multi-section concave-convex wall structure is a vertical concave-convex groove body structure, that is, the shell wall is also a vertical concave-convex groove body structure; the shell bottom is provided with two capacitor lead-out electrode lead-out through holes separated by a safe distance, and the two capacitor lead-out electrode lead-out through holes are used as the positive and negative lead-out through holes of the capacitor shell bottom. It can effectively enhance the overall anti-seismic strength of the capacitor packaging shell, effectively improve the protection strength of the internal capacitor core group against external force impact, improve the stability and reliability of the capacitor core group, and effectively increase the overall heat dissipation area of ​​the filter capacitor, improve the stability and reliability of the filter capacitor, and reduce the potting amount of epoxy resin inside the packaging shell, indirectly reducing the weight of the product.

[0008] Preferably, the housing wall has capacitor installation positioning holes at the bottom ends of several raised outer walls in the concave-convex wall structure, thereby improving the reliability and effectiveness of capacitor installation positioning and reducing the vibration influence on the capacitor.

[0009] Preferably, the copper upper cover is provided with a plurality of first through holes, a plurality of second through holes and a plurality of capacitor core welding positioning through holes on the upper cover plate, and the through hole size of the plurality of first through holes is larger than the through hole size of the plurality of second through holes. This improves the convenience and effectiveness of epoxy encapsulation pouring of the filter capacitor, improves the elimination of epoxy bubbles during pouring and curing, improves the quality of epoxy encapsulation, and improves the reliability and effectiveness of capacitor core welding positioning.

[0010] Preferably, the copper lower cover is provided with a plurality of first lower cover through holes and a plurality of capacitor core welding lower positioning through holes on the lower cover plate, so as to improve the epoxy bubble elimination performance during pouring and curing, improve the epoxy packaging quality, and improve the reliability and effectiveness of capacitor core welding positioning.

[0011] Preferably, the two capacitor lead-out electrode lead-out through holes are long hole-shaped, and the two capacitor lead-out electrode lead-out through holes form a three-equal structure along the radial center line of the copper lower cover in the length direction, thereby increasing the safe and effective creepage distance between the positive and negative terminals of the capacitor.

[0012] Preferably, each first upper cover conductive copper bar monomer in the first upper cover conductive copper bar group comprises a copper bar lower section, a first copper bar upper section and a second copper bar upper section, the copper bar lower section is connected and fixed to the outer side of the copper upper cover vertical wall, wherein the first copper bar upper section and the second copper bar upper section adopt a copper bar upper section structure with adjacent intervals and a height difference, the first copper bar upper section and the second copper bar upper section have a vertical vertical offset difference structure, and the roots of the first copper bar upper section and the second copper bar upper section are respectively extended and connected to the top of the copper bar lower section to form an integrated first upper cover conductive copper bar monomer; the second upper cover conductive copper bar group is provided with a second upper cover conductive sub-copper bar that is vertically folded upward, and the second upper cover conductive sub-copper bar adopts an L-shaped structure, one side of the L-shaped structure is connected to the outer peripheral edge of the copper upper cover, and the other side of the L-shaped structure is vertically folded upward to form a second upper cover conductive sub-copper bar with an upward vertical direction. The first upper cover conductive copper bar group and the second upper cover conductive copper bar group are improved to form a composite conductive copper bar structure, which can compound the magnetic field as much as possible, reduce stray inductance, reduce the use of absorption capacitance, and improve the working quality of the filter capacitor; improving the use of the first upper cover conductive copper bar group in epoxy packaging to enhance stability, reliability and effectiveness.

[0013] Preferably, each first lower cover conductive copper bar monomer in the first lower cover conductive copper bar group has a copper bar lower connection part, a first lower cover conductive copper bar division and a second lower cover conductive copper bar division. The copper bar lower connection part is folded horizontally from the first lower cover conductive copper bar division and connected and fixed to the bottom of the outer periphery of the copper lower cover. The second lower cover conductive copper bar division is connected and arranged at the side of the first lower cover conductive copper bar division. There is a height separation distance between the bottom end of the second lower cover conductive copper bar division and the copper lower cover. The bottom end of the second lower cover conductive copper bar division is located in the space above the copper lower cover. The top height of the second lower cover conductive copper bar division is lower than the top height of the first lower cover conductive copper bar division. The first upper cover conductive copper bar group and the second upper cover conductive copper bar group are improved to form a composite conductive copper bar structure, which can compound the magnetic field as much as possible, reduce stray inductance, reduce the use of absorption capacitors, and improve the working quality of filter capacitors; improve the use of the first lower cover conductive copper bar group in epoxy packaging to enhance stability, reliability and effectiveness.

[0014] The beneficial effects of the present invention are as follows: by configuring the filter capacitor with a composite copper bar structure that covers each other from top to bottom, the capacitor core group is safely and effectively positioned and fixed to form a capacitor core group to achieve more continuous tightness of the internal core, and improve the stability, reliability and effectiveness of the internal core of the capacitor; the magnetic field is compounded as much as possible, the stray inductance is reduced, the use of absorption capacitance is reduced, the working quality of the filter capacitor is improved, the cost is effectively reduced, and the weight of the product can be reduced; and a composite conductive heat dissipation copper bar structure is formed by the capacitor upper cover conductive copper bar group and the capacitor lower cover conductive copper bar group, providing the filter capacitor with stable, reliable and effective working electrode lead-out and reliable heat dissipation, which can better meet the special strict requirements of the filtrate capacitor in the field of aviation applications, such as high electrical stability and reliability, long service life and low aging rate, and improve the safety of service life. It provides high reliability and high sealing for aviation and aerospace systems. The capacitor has a capacitance of 245μF (±5%) and can work well within the voltage range of 1200V.DC. The rated current reaches 360A, and can reach 450A in a short time. When the aluminum shell is deformed under severe temperature shock, the internal core can be continuously tightened to avoid the shaking of the internal core under long-term strong vibration, which may cause the electrode connecting piece to break. BRIEF DESCRIPTION OF THE DRAWINGS The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Figure 1 The present invention is a schematic structural diagram of a conductive copper bar group on a capacitor cover in a DC filter capacitor used in the aviation field.

[0017] Figure 2 The present invention is a schematic structural diagram of a conductive copper bar group on a capacitor cover in a DC filter capacitor used in the aviation field, as viewed from the bottom side.

[0018] Figure 3 The present invention is a schematic structural diagram of a conductive copper bar group under a capacitor cover in a DC filter capacitor used in the aviation field.

[0019] Figure 4 The present invention is a schematic structural diagram of a conductive copper bar group under a capacitor cover in a DC filter capacitor used in the aviation field, as viewed from the bottom side.

[0020] Figure 5 It is a structural schematic diagram of a capacitor packaging shell in a DC filter capacitor used in the aviation field of the present invention.

[0021] Figure 6 It is a structural schematic diagram of a capacitor packaging shell in a DC filter capacitor used in the aviation field of the present invention observed from the bottom side.

[0022] Figure 7The present invention is a structural schematic diagram of a DC filter capacitor used in the aviation field in which a capacitor lower cover conductive copper bar group is provided in combination with a capacitor inner core group.

[0023] Figure 8 The present invention is a schematic structural diagram of a DC filter capacitor used in the aviation field, wherein a capacitor lower cover conductive copper bar group is provided in combination with a capacitor inner core group when viewed from the bottom side.

[0024] Fig. 9 It is a schematic diagram of the structure of the DC filter capacitor used in the aviation field after epoxy packaging of the present invention.

[0025] Fig.10 It is a schematic structural diagram of a DC filter capacitor used in the aviation field of the present invention observed from the bottom side after epoxy encapsulation.

[0026] Fig.11 It is a schematic diagram of the epoxy packaging structure of the DC filter capacitor used in the aviation field of the present invention. DETAILED DESCRIPTION

[0027] Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 In the embodiment shown, a DC filter capacitor used in the aviation field includes a capacitor upper cover conductive copper bar group 10 (see Figure 1 , Figure 2 )、Capacitor lower cover conductive copper bar group 20 (see Figure 3 , Figure 4 )、Capacitor core group 40 (see Figure 7 , Figure 8 ) and capacitor housing (see Figure 5 , Figure 6), the capacitor upper cover conductive copper bar group 10 and the capacitor lower cover conductive copper bar group 20 adopt a composite copper bar structure that covers each other from top to bottom. The capacitor upper cover conductive copper bar group 10 has an upper cover conductive copper bar group and a copper upper cover structure that is folded vertically downward. The upper cover conductive copper bar group connection end is distributed, connected and fixedly arranged at the outer periphery of the copper upper cover. The capacitor lower cover conductive copper bar group 20 has a lower cover conductive copper bar group and a copper lower cover structure that is folded vertically upward. The lower cover conductive copper bar group is distributed, connected and fixedly arranged at the outer periphery of the copper lower cover. The capacitor packaging shell 3 0 has a bottom shell 36 and a shell side wall structure that is vertically folded upward from the outer periphery of the bottom shell 36, and the capacitor core group 40 is distributed and fixedly arranged inside the closed cavity of the capacitor upper cover conductive copper bar group 10 and the capacitor lower cover conductive copper bar group 20 after the upper and lower covers are closed to each other. The inside of the closed cavity is a cylindrical cavity structure as a whole, and the capacitor packaging shell is a cylindrical structure with an opening on the shell top as a whole; the closed capacitor upper cover conductive copper bar group 10 and the capacitor lower cover conductive copper bar group 20 have a capacitor lead positive and negative conductive copper bar group (see Fig. 9 The positive and negative conductive copper bars are exposed on the epoxy packaging surface as shown in FIG. 1 ). The bottom shell of the capacitor packaging shell is provided with a capacitor positive and negative lead-out insulation block 60 (see FIG. 1 ). Figure 8 , Fig.10 ), the capacitor positive and negative lead-out terminal insulating block 60 is respectively arranged and distributed with a plurality of capacitor positive and negative terminals 16 (see FIG. 1 ) electrically connected and led out from the bottom shell. Fig.10 ), the inner ends of the positive and negative terminals 16 of the multiple capacitors are respectively connected to the ends of the second lower cover conductive copper bar 24 and the second upper cover conductive copper bar group (see Figure 1 , Figure 2 The terminals (marked 13 and 15) are conductively connected and fixed. The capacitor encapsulation shell adopts an aluminum alloy shell, which is lightweight and has high mechanical strength. The capacitor core group 40 adopts a pure aluminum two-inner string structure with high voltage resistance and high current carrying capacity. The insulating blocks of the positive and negative lead-out ends of the capacitor and the multiple positive and negative terminals of the capacitor electrically connected from the bottom shell can effectively maintain a safe and effective safety creepage distance between the capacitor encapsulation shell and the positive and negative terminals of the capacitor, thereby improving the safe service life of the filter capacitor and its corresponding application products. The capacitor core group 40 is arranged and distributed in a circular matrix structure inside the closed cavity of the cylindrical cavity structure (see Figure 5 , Figure 6 ), effectively improving the overall structural stability, reliability and strength protection of the capacitor core group, and also effectively improving the rationality of the overall spatial distribution of the filter capacitor, so that the outer capacitor core group is as close to the capacitor packaging shell as possible, improving the overall heat dissipation effectiveness of the filter capacitor, and extending the product life.

[0028] The capacitor upper cover conductive copper bar group 10 comprises a first upper cover conductive copper bar group, a second upper cover conductive copper bar group, a copper upper cover 11 and an upper cover vertical wall 11A extending from the outer periphery of the copper upper cover and folded downward vertically, wherein the first upper cover conductive sheet group adopts a plurality of upper cover conductive copper bars arranged at intervals and distributed on the outer side of the upper cover vertical wall 11A, and the upper end of the conductive copper bar of the first upper cover conductive copper bar group is higher than the height position of the copper upper cover and the height position of the epoxy package 50 surface of the capacitor; the number of conductive sheets of the second upper cover conductive copper bar group is less than the number of conductive sheets of the first upper cover conductive copper bar group, and the second upper cover conductive copper bar group (see Figure 1 , Figure 2 The marks 13 and 14 shown in the figure include a first conductive connection segment, a second conductive connection segment and a third conductive connection segment which are sequentially extended and connected, wherein the end of the first conductive connection segment is connected to the outer peripheral edge of the copper upper cover, the second conductive connection segment is vertically folded downward from the first conductive connection segment and extends to a position below the bottom end of the upper cover vertical wall, the third conductive connection segment is folded inward from the second conductive connection segment and extends to the bottom of the copper upper cover, and the third conductive connection segment is parallel to the copper upper cover surface, and the specific second upper cover conductive copper bar group includes three second upper cover conductive copper bar monomers folded downward to the bottom of the copper upper cover (see Figure 1 , Figure 2As shown in the figure, there is a second upper cover conductive copper bar 15 which is folded upward vertically, and the second upper cover conductive copper bar 15 and the second lower cover conductive copper bar 24 in the capacitor lower cover conductive copper bar group 20 form a group of positive and negative conductive copper bar groups which lead out epoxy packaging glue upward after the capacitor upper cover conductive copper bar group 10 and the capacitor lower cover conductive copper bar group 20 are covered together; the copper upper cover as a whole is a circular or polygonal structure close to a circular shape. The copper upper cover 11 is provided with a plurality of first through holes 11C, a plurality of second through holes 11D and a plurality of capacitor core welding positioning through holes or positioning parts 11E. When the capacitor core is welded with the positioning part 11E, the capacitor core is welded with the positioning part 11E. When the capacitor core is welded with the positioning part 11E, a welding positioning structure with a U-shaped protrusion or groove is adopted; the through hole size of the plurality of first through holes 11C is larger than the through hole size of the plurality of second through holes 11D. The plurality of first through holes 11C are used for epoxy pouring inlet and epoxy bubble permeability elimination and removal outlet during epoxy encapsulation, so as to improve the epoxy bubble elimination performance during the pouring and curing process of the capacitor core group, improve the epoxy encapsulation quality, and improve the terminal application quality of the DC filter capacitor product used in the aviation field. Among them, the first through hole 11C is a circular through hole as a whole with four axial notches extending inward along the outer periphery of the cross-axis to the axis, so as to improve the epoxy bubble elimination performance during the pouring and curing process of the capacitor core group, improve the epoxy encapsulation quality, and improve the terminal application quality of the DC filter capacitor product used in the aviation field. The second through hole 11D is a circular through hole or a polygonal through hole or an elliptical through hole, which improves the elimination of epoxy bubbles during the pouring and curing of the capacitor core group, improves the quality of epoxy packaging, and improves the terminal application quality of DC filter capacitor products used in the aviation field. The upper positioning through holes 11E for welding multiple capacitor cores adopt a welding positioning structure with a U-shaped protrusion or groove, which improves the stability, reliability and effectiveness of welding positioning. Each first upper cover conductive copper bar monomer in the first upper cover conductive copper bar group has a copper bar lower section 12, a first copper bar upper section 12A and a second copper bar upper section 12B. The copper bar lower section 12 is connected and fixed to the outer side of the copper upper cover wall 11A, wherein the first copper bar upper section 12A and the second copper bar upper section 12B adopt a copper bar upper section structure with adjacent spacing and a height difference (see Figure 1 , Figure 2 ), the first copper bar upper section 12A and the second copper bar upper section 12B have a vertical elevation misalignment difference structure, the roots of the first copper bar upper section 12A and the second copper bar upper section 12B are respectively extended and connected with the top of the copper bar lower section 12 to form an integrated first upper cover conductive copper bar monomer; the second upper cover conductive copper bar group is provided with a second upper cover conductive sub-copper bar 15 that is folded upward vertically, and the second upper cover conductive sub-copper bar adopts an L-shaped structure, one side of the L-shaped structure is connected to the outer peripheral edge of the copper upper cover 11, and the other side of the L-shaped structure is folded upward vertically to form a second upper cover conductive sub-copper bar 15 with an upward vertical direction.

[0029] The capacitor lower cover conductive copper bar group 20 includes a first lower cover conductive copper bar group, a second lower cover conductive copper bar and a copper lower cover. One end of the first lower cover conductive copper bar group is connected and fixed to the copper lower cover 21. The copper lower cover 21 has a groove notch 23 recessed from the outer periphery of the lower cover to the center. The second lower cover conductive copper bar 24 has an L-shaped structure as a whole, wherein the end of the long conductive copper bar segment of the L-shaped structure is connected and fixed to the inner end cover body of the notch of the groove notch 23, and the short conductive copper bar segment of the L-shaped structure is vertically folded upward to form a lower conductive copper bar group that is distributed and connected with the first lower cover conductive sheet group and arranged on the outer periphery of the copper lower cover. The copper lower cover 21 is a nearly circular structure in a circular or polygonal shape. The copper lower cover 21 is provided with a plurality of first lower cover through holes 21A and a plurality of capacitor core welding lower positioning through holes or positioning parts 21B distributed on the lower cover plate. The first lower cover through hole 21A is a circular through hole as a whole and has four axial notches extending inward along the outer periphery of the cross-axis along the axis. When the capacitor core is welded to the lower positioning portion 21B, the multiple capacitor core welding lower positioning through holes 21B adopt a U-shaped protrusion or groove welding positioning structure to improve the stability, reliability and effectiveness of welding positioning. The two capacitor lead-out electrode lead-out through holes 34 are long hole-shaped, and the two capacitor lead-out electrode lead-out through holes 34 form a three-equal structure state along the radial center line of the copper lower cover in the length direction. Each first lower cover conductive copper bar monomer in the first lower cover conductive copper bar group comprises a copper bar lower connection portion 22C, a first lower cover conductive copper bar division 22 and a second lower cover conductive copper bar division 22A. The copper bar lower connection portion 22C is folded laterally from the first lower cover conductive copper bar division and is connected and fixed to the bottom of the outer periphery of the copper lower cover 21. The second lower cover conductive copper bar division 22A is extended and connected to the side of the first lower cover conductive copper bar division 22, and there is a height separation distance between the bottom end of the second lower cover conductive copper bar division 22A and the copper lower cover 21. The bottom end of the second lower cover conductive copper bar division 22A is located in the space above the copper lower cover. The top height of the second lower cover conductive copper bar division 22A is lower than the top height of the first lower cover conductive copper bar division 22. A lower cover copper bar through hole 22B is provided at the top of the first lower cover conductive copper bar division 22.

[0030] The capacitor packaging shell 30 includes a shell bottom 36 and a shell wall 31. The shell bottom 36 is generally circular in shape. The shell wall is vertically folded from the outer periphery of the shell bottom and extends upward to form a packaging shell structure with an open shell top opening. The shell wall adopts a multi-stage concave-convex wall structure. The shell wall is annularly connected and arranged at the outer periphery of the shell bottom 36. The multi-stage concave-convex wall structure is a vertical concave-convex groove body structure, that is, the shell wall is also a vertical concave-convex groove body structure (see Figure 5The shell bottom 36 is provided with two capacitor lead-out electrode lead-out holes 34 separated by a safe distance, and the two capacitor lead-out electrode lead-out holes 34 are used as the positive and negative lead-out holes of the bottom of the capacitor shell. The shell wall is provided with capacitor mounting positioning holes 33 at the bottom ends of several raised outer walls in the concave-convex wall structure. Specifically, the shell wall with the capacitor mounting positioning holes 33 is arranged at the bottom end of the raised inner groove 31. The bottom end of the shell wall with the raised inner groove 31 is lower than the bottom end of other shell walls without the capacitor mounting positioning holes 33. The capacitor packaging shell 30 with multiple sections of concave-convex wall structure can effectively enhance the overall anti-seismic strength of the capacitor packaging shell, effectively improve the protection strength of the internal capacitor core group against external force impact, improve the stability and reliability of the use of the capacitor core group, and effectively increase the overall heat dissipation area of ​​the filter capacitor, improve the working stability and reliability of the filter capacitor, and reduce the potting amount of epoxy resin inside the packaging shell, indirectly reducing the weight of the product.

[0031] Fig.11 In the schematic diagram of the epoxy packaging structure shown, the circular ring on the inner side of the concave-convex epoxy packaging side surface 53 on the epoxy packaging 50 surface has a plurality of first epoxy packaging positions 521 and second epoxy packaging positions 52 corresponding to the first copper bar upper section 12A and the second copper bar upper section 12B of the first upper cover conductive copper bar group in the capacitor upper cover conductive copper bar group, respectively; and a plurality of third epoxy packaging positions 51 corresponding to the first lower cover conductive copper bar section 22 and the second lower cover conductive copper bar section 22A of the first lower cover conductive copper bar group in the capacitor lower cover conductive copper bar group, which effectively improves the packaging positioning, fixing, stability, reliability and effectiveness of the upper cover conductive copper bar group and the lower cover conductive copper bar group of the capacitor after epoxy packaging and the copper bar ends exposed above the epoxy packaging surface; the capacitor potting epoxy adopts low-density, high thermal conductivity epoxy resin and vacuum potting process, which ensures the product's resistance to high temperature wave current on the one hand and reduces the product weight on the other hand.

[0032] In the description of the positional relationship of the present invention, terms such as "inside", "outside", "up", "down", "left", "right", "bottom", "top", etc. that indicate orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing the embodiments and simplifying the description. They do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] The above content and structure describe the basic principle, main features and advantages of the product of the present invention, which should be understood by those skilled in the art. The above examples and descriptions are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A DC filter capacitor for aviation applications, characterized by: The invention comprises a capacitor upper cover conductive copper bar group, a capacitor lower cover conductive copper bar group, a capacitor inner core group and a capacitor packaging shell. The capacitor upper cover conductive copper bar group and the capacitor lower cover conductive copper bar group adopt a composite copper bar structure with upper and lower covers covering each other. The capacitor upper cover conductive copper bar group comprises an upper cover conductive copper bar group and a copper upper cover structure folded vertically downward. The upper cover conductive copper bar group connection end is distributed at the outer periphery of the copper upper cover. The capacitor lower cover conductive copper bar group comprises a lower cover conductive copper bar group and a copper lower cover structure folded vertically upward. The lower cover conductive copper bar group is distributed at the outer periphery of the copper lower cover. The capacitor packaging shell comprises a bottom shell and The shell side wall structure is vertically folded upward from the outer periphery of the bottom shell, and the capacitor core group is distributed inside the combined cover cavity of the capacitor upper cover conductive copper bar group and the capacitor lower cover conductive copper bar group after the upper and lower covers are closed to each other. The interior of the closed cavity is a cylindrical cavity structure as a whole. The capacitor upper cover conductive copper bar group and the capacitor lower cover conductive copper bar group after the covers are closed have capacitor lead-out positive and negative conductive copper bar groups leading out upward, and the outside of the bottom shell of the capacitor packaging shell is provided with capacitor positive and negative lead-out terminal insulating blocks, and a plurality of capacitor positive and negative terminals electrically connected from the bottom shell are respectively arranged and distributed.

2. The DC filter capacitor for aviation application according to claim 1, characterized in that: The capacitor upper cover conductive copper bar group comprises a first upper cover conductive copper bar group, a second upper cover conductive copper bar group, a copper upper cover and an upper cover vertical wall extending from the outer periphery of the copper upper cover and folded downward vertically, wherein the first upper cover conductive sheet group adopts a plurality of upper cover conductive copper bars arranged at intervals and distributed on the outer side of the upper cover vertical wall, and the upper end of the conductive copper bar of the first upper cover conductive copper bar group is higher than the height position of the copper upper cover and the height position of the epoxy packaging surface of the capacitor; the number of conductive sheets of the second upper cover conductive copper bar group is less than the number of conductive sheets of the first upper cover conductive copper bar group, and the number of conductive sheets of the second upper cover conductive copper bar group is less than the number of conductive sheets of the first upper cover conductive copper bar group. The two upper cover conductive copper bar groups include a first conductive connection segment, a second conductive connection segment and a third conductive connection segment which are sequentially extended and connected, wherein the end of the first conductive connection segment is connected to the outer peripheral edge of the copper upper cover, the second conductive connection segment is vertically folded downward from the first conductive connection segment and extends to a position below the bottom end of the upper cover vertical wall, the third conductive connection segment is folded inward from the second conductive connection segment and extends to below the copper upper cover, and the third conductive connection segment is parallel to the cover surface of the copper upper cover, and the copper upper cover as a whole is a circular or polygonal structure close to a circular shape.

3. The DC filter capacitor for aviation application according to claim 1, characterized in that: The capacitor lower cover conductive copper bar group comprises a first lower cover conductive copper bar group, a second lower cover conductive copper bar and a copper lower cover, one end of the first lower cover conductive copper bar group is connected and fixed to the copper lower cover, the copper lower cover has a groove notch recessed from the outer circumference of the lower cover to the center, the second lower cover conductive copper bar has an L-shaped structure as a whole, wherein the end head of the long conductive copper bar segment of the L-shaped structure is connected and fixed to the inner end cover body of the notch of the groove notch, the short conductive copper bar segment of the L-shaped structure is vertically folded upward to form a lower conductive copper bar group distributed and connected with the first lower cover conductive sheet group and arranged on the outer circumference of the copper lower cover, and the copper lower cover as a whole is a circular or polygonal structure close to a circular shape.

4. The DC filter capacitor for aviation application according to claim 1, characterized in that: The capacitor packaging shell comprises a shell bottom and a shell vertical wall. The shell bottom is generally circular in shape. The shell vertical wall is vertically folded from the outer periphery of the shell bottom and extends upward to form a packaging shell structure with an open shell top opening. The shell vertical wall adopts a multi-section concave-convex vertical wall structure. The shell vertical wall is annularly connected and arranged at the outer periphery of the shell bottom. The multi-section concave-convex vertical wall structure is a vertical concave-convex groove body structure, that is, the shell vertical wall is also a vertical concave-convex groove body structure; the shell bottom is provided with two capacitor lead-out electrode lead-out through holes separated by a safety distance, and the two capacitor lead-out electrode lead-out through holes are used as the positive and negative lead-out through holes of the capacitor shell bottom.

5. The DC filter capacitor for aviation application according to claim 4, characterized in that: The housing vertical wall is provided with capacitor installation positioning holes at the bottom ends of several raised outer vertical walls in the concave-convex vertical wall structure.

6. The DC filter capacitor for aviation application according to claim 2, characterized in that: The copper upper cover is provided with a plurality of first through holes, a plurality of second through holes and a plurality of positioning through holes or positioning parts welded on the capacitor core on the upper cover plate, and the through hole size of the plurality of first through holes is larger than the through hole size of the plurality of second through holes.

7. The DC filter capacitor for aviation application according to claim 3, characterized in that: The copper lower cover is provided with a plurality of first lower cover through holes and a plurality of capacitor core welding lower positioning through holes or positioning parts distributed on the lower cover plate.

8. The DC filter capacitor for aviation application according to claim 4, characterized in that: The two capacitor lead-out electrode lead-out through holes are in the shape of long holes, and the two capacitor lead-out electrode lead-out through holes form a three-equally divided structure along the radial center line of the copper lower cover in the length direction.

9. The DC filter capacitor for aviation application according to claim 2, characterized in that: Each first upper cover conductive copper bar monomer in the first upper cover conductive copper bar group comprises a copper bar lower section, a first copper bar upper section and a second copper bar upper section, the copper bar lower section is connected and fixed to the outer side of the copper upper cover vertical wall, wherein the first copper bar upper section and the second copper bar upper section adopt a copper bar upper section structure with adjacent intervals and a height difference, the first copper bar upper section and the second copper bar upper section have a vertical vertical surface misalignment difference structure, the roots of the first copper bar upper section and the second copper bar upper section are respectively extended and connected with the top of the copper bar lower section to form an integrated first upper cover conductive copper bar monomer; the second upper cover conductive copper bar group is provided with a second upper cover conductive sub-copper bar that is vertically folded upward, the second upper cover conductive sub-copper bar adopts an L-shaped structure, one side of the L-shaped structure is connected to the outer peripheral edge of the copper upper cover, and the other side of the L-shaped structure is vertically folded upward to form a second upper cover conductive sub-copper bar with an upward vertical direction.

10. The DC filter capacitor for aviation application according to claim 3, characterized in that: Each first lower cover conductive copper bar monomer in the first lower cover conductive copper bar group comprises a copper bar lower connecting portion, a first lower cover conductive copper bar division and a second lower cover conductive copper bar division. The copper bar lower connecting portion is laterally folded from the first lower cover conductive copper bar division and is connected and fixed to the bottom of the outer periphery of the copper lower cover. The second lower cover conductive copper bar division is connected and arranged at the side of the first lower cover conductive copper bar division, and a height separation distance is provided between the bottom end of the second lower cover conductive copper bar division and the copper lower cover. The bottom end of the second lower cover conductive copper bar division is located in the space above the copper lower cover, and the top end height of the second lower cover conductive copper bar division is lower than the top end height of the first lower cover conductive copper bar division.

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