Buffer power capacitor
By using aluminum foil electrodes and polypropylene film insulating layer, combined with diarylethane PXE insulating oil, the problem of insufficient ability of buffer capacitors to withstand large currents in the prior art is solved, voltage spike limit and stable current supply are achieved, and the Capacity stability and voltage resistance.
Patent Information
- Application Number
- CN202420504142.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-14
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-03-14
AI Technical Summary
Existing buffer capacitors use metallized films as dielectrics, which have poor ability to withstand large currents and weak ability to carry large currents, resulting in the loss of capacity and reduced capacity under long-term working conditions.
Aluminum foil is used as electrodes, and the core is formed by disassembly stacking and winding, and polypropylene film and capacitor paper are used as insulating layers, combined with diarylethane PXE insulating oil to enhance insulation ability and voltage resistance.
Effectively limit circuit voltage spikes, store excess charge, provide stable current supply, improve the capacity stability and voltage resistance of the capacitor, and enhance insulation and heat dissipation effect.
Smart Images
Figure CN222281784U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of capacitors, in particular to a buffer power capacitor. Background Art
[0002] Buffer capacitors protect circuit components by limiting the speed at which voltage rises. Buffer capacitors generally use metallized film as a medium. Because the thickness of the metallized film layer is relatively thin, the ability to withstand large currents is relatively poor, and the ability to carry large currents is relatively weak. The volume after winding is also much smaller than that of metal foil capacitors. However, the capacitance stability of capacitors using metallized film layers is poor. Metallized capacitors are prone to capacity loss under long-term working conditions, and their capacity can be reduced after self-healing. In view of this, this application is specially proposed. Utility Model Content
[0003] This application proposes a buffer power capacitor to solve the technical problems that the buffer general capacitor products in the prior art use metallized film as the medium, have poor high current tolerance and weak high current carrying capacity, and the volume after winding is much smaller than that of metal foil capacitors, and metallized capacitors are prone to capacity loss under long-term working conditions and can lead to capacity reduction after self-healing. The above technical objectives of the utility model are achieved through the following technical solutions:
[0004] A buffer power capacitor comprises an aluminum shell, insulating oil, a core, a lead sheet, an outer wrapping paper, a solder layer insulating seat, a flat quick-connect plug, a sealing pad, a cover, an insulating paperboard and rivets.
[0005] The core is arranged in the aluminum shell, the lead-out pieces are arranged on both end surfaces of the core respectively, the outer wrapping paper is divided into two layers, the upper and lower layers of the outer wrapping paper are arranged on both sides of the core respectively, the insulating oil is arranged in the aluminum shell, the insulating seat is arranged on the top of the cover structure, and the flat quick-connect plug is arranged in the insulating seat; the rivet head is connected to the core, the cover is arranged on the aluminum shell, the rivet passes through the cover, the insulating paperboard is arranged between the rivet and the cover, the sealing gasket is arranged on the top of the cover, and the rivet passes through the insulating paperboard and the sealing gasket in sequence to be connected to the lower side of the flat quick-connect plug;
[0006] The core comprises an insulating layer and an aluminum foil, wherein the insulating layer and the aluminum foil are stacked and wound in staggered layers, respectively; the insulating layer comprises two film layers and a capacitor paper layer, and the capacitor paper is located between the two film layers.
[0007] Preferably, the bottom and top ends of the core are both provided with solder layers, and the lead-out pieces are arranged on the solder layers.
[0008] Preferably, the film is a polypropylene film.
[0009] Preferably, the distance between the flat quick-connect plug terminals is 40 mm.
[0010] Preferably, the insulating oil is diarylethane PXE.
[0011] Preferably, the solder layers are arranged on half of the end surface of the core.
[0012] Compared with the prior art, the beneficial effects of the utility model include: by setting aluminum foil as an electrode, the upper and lower layers of aluminum foil are respectively moved outward a certain distance along the top and bottom of the insulating layer, and then wound to form a core, the voltage spike on the circuit can be limited to a safe level through the buffer capacitor, and excess charge can be stored. These charges can be released when needed, so that the current in the circuit is stably supplied, which can be suitable for circuits with high requirements for capacity stability; the insulating layer adopts two layers of film layers and one layer of capacitor paper. By using thicker insulating materials, the insulation capacity between the two poles is enhanced, and the core has a larger volume after winding, and there is more space in the aluminum shell to inject insulating oil, so that the voltage resistance performance of the two poles in the capacitor is improved, and the insulation between the electrodes inside the capacitor and the shell can be strengthened. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of the utility model;
[0014] Figure 2 It is a structural schematic diagram of the core end face of the utility model;
[0015] Figure 3 It is a schematic diagram of the structure of the insulating layer of the utility model;
[0016] In the figure: 1. Aluminum shell; 2. Insulating oil; 3. Core; 4. Lead sheet; 5. Outer paper; 6. Solder layer; 7. Insulating seat; 8. Flat quick-connect plug; 9. Sealing gasket; 10. Cover; 11. Insulating cardboard; 12. Rivet; 13. Aluminum foil; 14. Film layer; 15. Capacitor paper. DETAILED DESCRIPTION
[0017] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the 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 present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0019] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.
[0020] Please see attached Figure 1-3 A buffer power capacitor comprises an aluminum shell 1, insulating oil 2, a core 3, a lead sheet 4, an outer paper 5, an insulating seat 7, a flat quick-connect plug 8, a sealing gasket 9, a cover 10, an insulating paperboard 11 and a rivet 12.
[0021] The core 3 is arranged in the aluminum shell 1, the lead-out pieces 4 are arranged on both end surfaces of the core 3, the outer wrapping paper 5 is divided into an upper and a lower layer, and the upper and lower layers of the outer wrapping paper 5 are arranged on both sides of the core 3, respectively. The insulating oil 2 is arranged in the aluminum shell 1, the insulating seat 7 is arranged on the top of the cover 10 structure, and the flat quick-connect plug 8 is arranged in the insulating seat 7; the head of the rivet 12 is connected to the core 3, the cover 10 is arranged on the aluminum shell 1, the rivet 12 passes through the cover 10, the insulating paperboard 11 is arranged between the rivet 12 and the cover 10, the sealing gasket 9 is arranged on the top of the cover 10, and the rivet 12 passes through the insulating paperboard 11 and the sealing gasket 9 in sequence to connect with the lower side of the flat quick-connect plug 8;
[0022] The core 3 includes an insulating layer and an aluminum foil 13 , which are stacked and wound in staggered layers. The insulating layer includes two film layers 14 and a capacitor paper 15 . The film is a polypropylene film. The capacitor paper 15 is located between the two film layers 14 .
[0023] The above technical scheme is adopted, a composite structure of polypropylene film and capacitor paper 15 is used as an insulating medium, and aluminum foil 13 is used as an electrode, and is made by a winding process. Since some noise pulse signals are often encountered in the control circuit, and their peak voltage and current are very high, the voltage spikes on the circuit can be limited to a safe level through a buffer capacitor, and excess charges can be stored. These charges can be released when needed, so that the current in the circuit is stably supplied; aluminum foil 13 is used as an electrode, which is suitable for circuits with high requirements for capacity stability. The upper and lower layers of aluminum foil 13 are respectively moved outward along the top and bottom of the insulating layer for a certain distance, and then wound to form a core 3. The core 3 adopts non-inductive winding. On the aluminum foil 13 at the top and bottom of the core 3 that exceeds the film position, a half solder layer 6 is welded. This capacitor can withstand high voltage and high pulses under high frequency conditions;
[0024] Since the aluminum foil 13 has a certain thickness, and the insulating layer uses two film layers 14 and a capacitor paper layer 15, the insulation capacity between the two poles is enhanced by using a thicker insulating material, and the core 3 has a larger volume after winding, and there is more space in the aluminum shell 1 to inject the insulating oil 2, so that the voltage resistance performance of the two poles in the capacitor is improved, and the insulation between the electrodes inside the capacitor and the shell is also strengthened.
[0025] In some embodiments, solder layers 6 are provided at the bottom and top of the core 3 , the lead-out pieces 4 are provided on the solder layers 6 , and the solder layers 6 are provided at half of the end surface of the core 3 .
[0026] With the above technical solution, since the core 3 is wound without inductance, by providing the solder layer 6 at the top and half of the bottom of the core 3, the capacitor can withstand high voltage and high pulse under high frequency conditions.
[0027] In some embodiments, the distance between the terminals of the flat quick connect plug 8 is 40 mm.
[0028] By adopting the above technical solution, the center distance between the two flat quick-connect plugs 8 terminals is expanded to 40mm, which increases the creepage distance between the two terminals and ensures the insulation performance of the capacitor.
[0029] In some embodiments, the insulating oil 2 is diarylethane PXE.
[0030] By adopting the above technical scheme, the average breakdown voltage of diarylethane PXE insulating oil 2 can reach ≥60KV / 2.5mm. This dielectric strength is very high. When immersed in the capacitor, it can not only improve the voltage resistance of the two poles in the capacitor, but also strengthen the insulation between the electrodes inside the capacitor and the shell. In addition, the insulating oil 2 has a good heat dissipation effect. The capacitor will generate heat during operation. This heat generation is actually a normal phenomenon, but abnormal temperature rise and excessive heat generation will accelerate the aging of the internal insulation of the capacitor, affecting the performance and life of the capacitor. Even worse, it will cause thermal breakdown, bulging, explosion, etc. Therefore, the heat dissipation of the capacitor also needs to be considered, and the insulating oil 2 can give full play to its advantages of good heat dissipation to ensure that the capacitor can cool down quickly.
[0031] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation on the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the claims attached to the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims, or the equivalent forms of such scope and boundaries.
Claims
1. A buffer power capacitor, characterized in that: It comprises an aluminum shell (1), insulating oil (2), a core (3), a lead sheet (4), an outer paper (5), an insulating seat (7), a flat quick-connect plug (8), a sealing gasket (9), a cover (10), an insulating paperboard (11) and a rivet (12). The core (3) is arranged in the aluminum shell (1), the lead-out plates (4) are respectively arranged on both end surfaces of the core (3), the outer wrapping paper (5) is divided into an upper and a lower layer, and the upper and lower layers of the outer wrapping paper (5) are respectively arranged on both sides of the core (3), the insulating oil (2) is arranged in the aluminum shell (1), the insulating seat (7) is arranged on the top of the cover (10) structure, and the flat quick-connect plug (8) is arranged in the insulating seat (7); the head of the rivet (12) is connected to the core (3), the cover (10) is arranged on the aluminum shell (1), the rivet (12) passes through the cover (10), the insulating paperboard (11) is arranged between the rivet (12) and the cover (10), the sealing gasket (9) is arranged on the top of the cover (10), and the rivet (12) passes through the insulating paperboard (11) and the sealing gasket (9) in sequence to be connected to the lower side of the flat quick-connect plug (8); The core (3) comprises an insulating layer and an aluminum foil (13), wherein the insulating layer and the aluminum foil (13) are respectively stacked and wound in staggered layers, and the insulating layer comprises two thin film layers (14) and a capacitor paper (15), wherein the capacitor paper (15) is located between the two thin film layers (14).
2. A buffer power capacitor according to claim 1, characterized in that: The bottom and top ends of the core (3) are both provided with a solder layer (6), and the lead-out piece (4) is arranged on the solder layer (6).
3. A buffer power capacitor according to claim 1, characterized in that: The film is a polypropylene film.
4. A buffer power capacitor according to claim 1, characterized in that: The distance between the terminals of the flat quick-connect plug piece (8) is 40 mm.
5. A buffer power capacitor according to claim 1, characterized in that: The insulating oil (2) is diarylethane PXE.
6. A buffer power capacitor according to claim 2, characterized in that: The solder layers (6) are all arranged at half of the end surface of the core (3).