Ultrastrong lightning stroke resistant aluminum electrolytic capacitor
By using double-layer high-density electrolytic paper and metallized polypropylene film as isolation layers in aluminum electrolytic capacitors, the problem of the degradation of conductivity and insulation performance of existing aluminum electrolytic capacitors after multiple voltages is solved, achieving higher lightning resistance and longer service life.
Patent Information
- Application Number
- CN202421015778.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-05-11
AI Technical Summary
After experiencing multiple voltages, high-density electrolytic paper will cause physical damage to the existing aluminum electrolytic capacitors, resulting in a decrease in conductivity and insulation performance, affecting the service life of the capacitor.
The metallized polypropylene film is used as the isolation layer. The metallized polypropylene film is cast from polytetrafluoroethylene and metal materials, which can be exposed to lightning strikes first and automatically restore the insulation capacity after breakdown.
It significantly improves the lightning resistance of the capacitor, extends the service life of the capacitor, and avoids breakdown and burst problems caused by overvoltage.
Smart Images
Figure CN222600758U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of aluminum electrolytic capacitors, in particular to an aluminum electrolytic capacitor capable of resisting ultra-strong lightning strikes. Background Art
[0002] Aluminum electrolytic capacitors are generally used in lighting or daily household appliances. When lightning strikes the transmission line due to sudden severe weather, there will be an instantaneous high-voltage surge in the residential transmission line, which will cause ordinary electrolytic capacitors in lighting appliances or household appliances to break down, explode or bulge due to overvoltage, causing abnormal performance of the appliance and even damage to the appliance. Electrolytic capacitors are one of the components used in large quantities in electronic equipment. They are widely used in circuits for DC isolation, AC passing, coupling, bypassing, filtering, tuning circuits, energy conversion, control, etc. However, ordinary aluminum electrolytic capacitors are usually rated for use at 400-500WV, and the instantaneous high voltage resistance will not exceed 3000V. When the instantaneous high voltage exceeds 3000V, the capacitor will be damaged and burst.
[0003] Existing aluminum electrolytic capacitors generally use high-density electrolytic paper to improve the lightning resistance of aluminum electrolytic capacitors. Although the effect is significant, the electrolytic paper will be physically damaged after experiencing multiple voltages, resulting in a decrease in its conductive and insulating properties, affecting the service life of the capacitor. Therefore, we propose an aluminum electrolytic capacitor that is resistant to super-strong lightning strikes in order to solve the above-mentioned problems. Utility Model Content
[0004] The purpose of the utility model is to provide an aluminum electrolytic capacitor resistant to super-strong lightning strikes, so as to solve the problem proposed in the above background technology that the existing aluminum electrolytic capacitors generally use high-density electrolytic paper to improve the lightning resistance of the aluminum electrolytic capacitor. Although the effect is significant, the electrolytic paper will be physically damaged after experiencing multiple voltages, resulting in a decrease in its conductive and insulating properties, which affects the service life of the capacitor.
[0005] To achieve the above object, the utility model provides the following technical solutions: an aluminum electrolytic capacitor resistant to ultra-strong lightning strikes, comprising an aluminum shell, an element is arranged inside the aluminum shell, and a rubber seal is installed on the upper end of the element;
[0006] Also includes:
[0007] The element is wound by an isolation layer, a positive aluminum foil and a negative aluminum foil. The positive aluminum foil is arranged on the outside of the negative aluminum foil. Two isolation layers are provided, and the two isolation layers are respectively arranged on the outer walls of the positive aluminum foil and the negative aluminum foil. A positive electrode guide needle is installed at one end of the positive aluminum foil, and a negative electrode guide needle is installed at one end of the negative aluminum foil.
[0008] Preferably, the isolation layer comprises a first high-density electrolytic paper, a second high-density electrolytic paper and a metallized polypropylene film, wherein the first high-density electrolytic paper is arranged on the outer wall of the second high-density electrolytic paper, and the metallized polypropylene film is arranged on the outer wall of the first high-density electrolytic paper and the inner wall of the second high-density electrolytic paper.
[0009] Preferably, the element is impregnated with electrolyte.
[0010] Preferably, a thin-wall explosion-proof layer is provided at the lower end of one side of the aluminum shell.
[0011] Preferably, a PVC insulating waterproof film is packaged on the outer wall of the aluminum shell.
[0012] Preferably, a pressure relief hole is provided at the lower end of one side of the PVC insulating waterproof film.
[0013] Compared with the prior art, the beneficial effects of the utility model are:
[0014] 1. The capacitor element of the utility model is wound by an isolation layer, a positive aluminum foil and a negative aluminum foil, wherein the isolation layer includes a double-layer high-density electrolytic paper and a metallized polypropylene film located on the inner and outer walls of the double-layer high-density electrolytic paper. When the voltage suddenly increases, the metallized polypropylene film located on the outer layer of the double-layer high-density electrolytic paper can be preferentially contacted with lightning strikes. The metallized polypropylene film is formed by casting polytetrafluoroethylene and metal materials, and has a high local discharge voltage. Due to its own high insulation strength, it has a very high lightning resistance effect in combination with the inner layer of high-density electrolytic paper. Once the film is broken down, the metallized electrode at the breakdown point can evaporate quickly and automatically restore the insulation capacity. The metallized polypropylene film with self-recovery function preferentially weakens the electric shock to reduce the lightning resistance pressure of the double-layer high-density electrolytic paper, thereby ensuring that the capacitor works reliably for a long time, solving the problem that the existing aluminum electrolytic capacitor generally uses high-density electrolytic paper to improve the lightning resistance of the aluminum electrolytic capacitor. Although the effect is significant, the electrolytic paper will be physically damaged after experiencing multiple voltages, resulting in a decrease in its conductive and insulating properties, affecting the service life of the capacitor.
[0015] 2. By setting a thin-wall explosion-proof layer at the lower end of one side of the aluminum shell, when corona, breakdown discharge and severe dissociation are generated inside the capacitor, the capacitor will produce a series of physical, chemical and electrical effects under the action of overvoltage, accelerating the aging and decomposition of insulation to produce gas, forming a vicious circle, so that the pressure of the aluminum shell increases. At this time, the thin-wall explosion-proof layer at the lower end of one side of the aluminum shell will rupture first under the action of pressure and release the internal gas to avoid the explosion of the capacitor. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0017] Figure 2 It is a schematic diagram of the internal structure of the utility model;
[0018] Figure 3 It is a partial enlarged view of point A of the utility model;
[0019] In the figure: 1. Aluminum shell; 2. Rubber head; 3. Positive electrode guide needle; 4. Negative electrode guide needle; 5. Element; 501. Isolation layer; 5011. First high-density electrolytic paper; 5012. Second high-density electrolytic paper; 5013. Metallized polypropylene film; 502. Positive electrode aluminum foil; 503. Negative electrode aluminum foil; 6. Thin-wall explosion-proof layer; 7. PVC insulating waterproof film; 8. Pressure relief hole. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0021] See also Figure 1-3 The utility model provides an embodiment: an aluminum electrolytic capacitor resistant to ultra-strong lightning strikes, comprising an aluminum shell 1, an element 5 is arranged inside the aluminum shell 1, and a rubber seal 2 is installed on the upper end of the element 5;
[0022] Also includes:
[0023] The element 5 is wound by an isolation layer 501, a positive aluminum foil 502 and a negative aluminum foil 503. The positive aluminum foil 502 is arranged on the outside of the negative aluminum foil 503. Two isolation layers 501 are provided, and the two isolation layers 501 are respectively arranged on the outer walls of the positive aluminum foil 502 and the negative aluminum foil 503. A positive electrode guide needle 3 is installed at one end of the positive aluminum foil 502, and a negative electrode guide needle 4 is installed at one end of the negative aluminum foil 503.
[0024] See also Figure 3 The isolation layer 501 includes a first high-density electrolytic paper 5011, a second high-density electrolytic paper 5012 and a metallized polypropylene film 5013. The first high-density electrolytic paper 5011 is arranged on the outer wall of the second high-density electrolytic paper 5012, and the metallized polypropylene film 5013 is arranged on the outer wall of the first high-density electrolytic paper 5011 and the inner wall of the second high-density electrolytic paper 5012. When the voltage suddenly increases, the metallized polypropylene film 5013 located on the outer layer of the double-layer high-density electrolytic paper can be contacted with lightning strikes first. The metallized polypropylene film 5013 is made of polytetrafluoroethylene and metal materials through casting, and has a high local discharge voltage. Due to its own high insulation strength, it has a very high lightning resistance effect in combination with the inner layer of high-density electrolytic paper. Once the film is broken down, the metallized electrode at the breakdown point can evaporate quickly and automatically restore the insulation capacity, thereby ensuring that the capacitor can work reliably for a long time.
[0025] See also Figure 2 Element 9 is immersed in an electrolyte, the solute of the electrolyte is mainly ammonium azelaic acid and dibutyl suberic acid, and the additives are mainly boric acid polyester glue and nitrobenzyl alcohol.
[0026] See also Figure 2 A thin-wall explosion-proof layer 6 is provided at the lower end of one side of the aluminum shell 1. When corona, breakdown discharge and severe ionization are generated inside the capacitor, the capacitor will produce a series of physical, chemical and electrical effects under the action of overvoltage, accelerating insulation aging and decomposition to produce gas, forming a vicious circle, so that the pressure of the aluminum shell 1 increases. At this time, the thin-wall explosion-proof layer 6 located at the lower end of one side of the aluminum shell 1 will be broken first under the action of pressure to release the internal gas to avoid the explosion of the capacitor.
[0027] See also Figure 2 A PVC insulating waterproof film 7 is encapsulated on the outer wall of the aluminum shell 1, and the PVC insulating waterproof film 7 improves the overall waterproof and moisture-proof performance of the capacitor.
[0028] See also Figure 2 A pressure relief hole 8 is provided at the lower end of one side of the PVC insulating waterproof film 7. The setting of the pressure relief hole 8 enables the gas to be released smoothly when the thin-wall explosion-proof layer 6 is broken.
[0029] Working principle: When in use, the outer wall of the capacitor aluminum shell 1 is encapsulated with a PVC insulating waterproof film 7, which improves the overall waterproof and moisture-proof performance of the capacitor. The internal element 5 is wound by an isolation layer 501, a positive aluminum foil 502 and a negative aluminum foil 503, wherein the isolation layer 501 includes a double-layer high-density electrolytic paper and a metallized polypropylene film 5013 located on the inner and outer walls of the double-layer high-density electrolytic paper. When the voltage suddenly increases, the metallized polypropylene film 5013 located on the outer layer of the double-layer high-density electrolytic paper can be contacted with lightning strikes first. The metallized polypropylene film 5013 is made of polytetrafluoroethylene and metal material by casting, and the local discharge voltage is relatively high. Due to its strong insulation The film has a large thickness and has a very high lightning resistance effect when combined with the inner layer of high-density electrolytic paper. Once the film is broken down, the metallized electrode at the breakdown point can evaporate quickly and automatically restore the insulation capacity, thereby ensuring that the capacitor can work reliably for a long time. A thin-walled explosion-proof layer 6 is provided at the lower end of one side of the aluminum shell 1. When corona, breakdown discharge and severe ionization are generated inside the capacitor, the capacitor will produce a series of physical, chemical and electrical effects under the action of overvoltage, accelerating the aging of the insulation, decomposing and producing gas, forming a vicious circle, so that the pressure of the aluminum shell 1 increases. At this time, the thin-walled explosion-proof layer 6 located at the lower end of one side of the aluminum shell 1 will be broken first under the action of pressure to release the internal gas to avoid the explosion of the capacitor.
[0030] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
Claims
1. An aluminum electrolytic capacitor resistant to ultra-strong lightning strikes, comprising an aluminum shell (1), an element (5) is arranged inside the aluminum shell (1), and a rubber seal (2) is installed at the upper end of the element (5); Features: Also includes: The element (5) is wound by an isolation layer (501), a positive aluminum foil (502) and a negative aluminum foil (503); the positive aluminum foil (502) is arranged on the outside of the negative aluminum foil (503); two isolation layers (501) are provided, and the two isolation layers (501) are respectively arranged on the outer walls of the positive aluminum foil (502) and the negative aluminum foil (503); one end of the positive aluminum foil (502) is installed with a positive electrode guide needle (3), and one end of the negative aluminum foil (503) is installed with a negative electrode guide needle (4).
2. The aluminum electrolytic capacitor resistant to ultra-strong lightning strikes according to claim 1 is characterized in that: The isolation layer (501) comprises a first high-density electrolytic paper (5011), a second high-density electrolytic paper (5012) and a metallized polypropylene film (5013), wherein the first high-density electrolytic paper (5011) is arranged on the outer wall of the second high-density electrolytic paper (5012), and the metallized polypropylene film (5013) is arranged on the outer wall of the first high-density electrolytic paper (5011) and the inner wall of the second high-density electrolytic paper (5012).
3. The aluminum electrolytic capacitor resistant to ultra-strong lightning strikes according to claim 1 is characterized in that: The element (5) is impregnated with electrolyte.
4. The aluminum electrolytic capacitor resistant to ultra-strong lightning strikes according to claim 1 is characterized in that: A thin-wall explosion-proof layer (6) is provided at the lower end of one side of the aluminum shell (1).
5. The aluminum electrolytic capacitor resistant to ultra-strong lightning strikes according to claim 1 is characterized in that: A PVC insulating waterproof film (7) is packaged on the outer wall of the aluminum shell (1).
6. The aluminum electrolytic capacitor resistant to ultra-strong lightning strikes according to claim 5, characterized in that: A pressure relief hole (8) is provided at the lower end of one side of the PVC insulating waterproof film (7).