Vibration-resistant ox horn capacitor

Abstract

The invention discloses a vibration-resistant ox horn capacitor, and relates to the technical field of capacitors. The device comprises a sleeve, an aluminum pipe is sleeved with the sleeve, a bottom pad is fixedly connected to the bottom of the aluminum pipe, a sealing plug is installed in the aluminum pipe, a cover plate is fixedly connected to the top end of the aluminum pipe, and a limiting sleeve is arranged at the top end of the bottom pad and made of rubber; the capacitor core is installed in the limiting sleeve in a limiting mode, the two sides of the top end of the capacitor core are both provided with leading-out strips, the two sides of the sealing plug are provided with aluminum stems matched with the leading-out strips, the two sides of the cover plate are both provided with buffering openings, rubber pads are installed in the buffering openings, welding pins are installed between the cover plate and the rubber pads, and the rubber pads are used for blocking vibration of the welding pins. The internal structure of an existing capacitor is changed in a small range, the vibration resistance of the capacitor is improved, meanwhile, the connecting tightness of the welding pins and the capacitor body is blocked, and the service life of the welding points of the capacitor is longer.

Description

Technical Field

[0001] The invention relates to the technical field of capacitors, and in particular to a vibration-resistant horn capacitor. Background Art

[0002] Horn-type electrolytic capacitors are named for their unique appearance. Their structure is usually cylindrical or similar, and both ends are welded with welding pins that resemble curved horns. This structure enables the capacitor to be firmly mounted on the circuit board in a self-supporting form. It is suitable for applications that need to withstand large currents and high voltages. Electrical appliances with large currents and high voltages are usually accompanied by certain vibrations during use. Long-term vibrations can cause excessive fatigue at the welding points between the welding pins and the circuit board, thereby reducing the connection strength of the welding points. That is, horn capacitors often require earthquake resistance when used.

[0003] The patent specification with the announcement number CN220569548U discloses a novel vibration-resistant horn capacitor, including a protective shell, a fixing ring is arranged on the outer side of the protective shell near the top of the protective shell, two groups of L-shaped fixing plates are arranged on the upper end of the fixing ring, lead wires are passed through one end of the two groups of L-shaped fixing plates, the ends of the lead wires are connected to the inner core, a heat sink is arranged at the bottom of the inner core, a plurality of buffer springs are connected to the end of the heat sink away from the inner core, and a heat sink is fixedly installed at the bottom of the protective shell; The vibration-proof structure of the existing bullhorn capacitors is a spring assembly for shock absorption arranged in the aluminum shell of the capacitor as in the above-mentioned technical solution. However, the disadvantage is that the bullhorn capacitors are mass-produced assembly line products and are conventionally small in size. The internal space cannot be used to install a vibration-proof spring structure with a complex transmission form. Moreover, the spring, as a metal product, will also affect the normal electrolysis process of the internal electrolyte. Although the core package of the existing conventional bullhorn capacitors is converged, since storage space is needed for the electrolyte, there are a large number of gaps in its internal structure, which makes it easy to cause resonance when vibration occurs, affecting the structural strength of the welding pin connection. Summary of the invention

[0004] The purpose of the present invention is to provide a vibration-resistant horn capacitor, and the technical problems to be solved are as follows: the vibration-proof structure of the existing horn capacitor cannot effectively avoid the resonance problem, and the structural changes are relatively large, and it is no longer suitable for assembly line production.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A vibration-resistant horn capacitor comprises a sleeve, an aluminum tube is sleeved inside the sleeve, a bottom pad is fixedly connected to the bottom of the aluminum tube, a sealing plug is installed inside the aluminum tube, and a cover plate is fixedly connected to the top, a limiting sleeve is arranged on the top of the bottom pad, and the limiting sleeve is made of rubber; a capacitor core is installed in a limited position inside the limiting sleeve, lead strips are arranged on both sides of the top of the capacitor core, aluminum stems are installed on both sides of the sealing plug to adapt to the lead strips, buffer ports are opened on both sides of the cover plate, rubber pads are installed inside the buffer ports, a welding pin is installed between the cover plate and the rubber pad, and the rubber pad is used to block the vibration of the welding pin.

[0006] As a further solution of the present invention: the sleeve is made of rubber and fits with the outer side of the aluminum tube, a closing ring is provided on the outer side of the aluminum tube, and the sealing plug is provided with a groove along the circumferential side and is embedded with the inner side of the closing ring.

[0007] As a further solution of the present invention: a shrinking tape is sleeved on the outer side of the capacitor core, the outer side of the shrinking tape abuts against the inner side of the limiting sleeve, liquid passage openings are evenly arranged on the circumferential side of the shrinking tape, and a liquid storage cavity is arranged between the liquid passage opening and the limiting sleeve.

[0008] As a further solution of the present invention: the bottom surface of the sealing plug abuts against the adjacent side of the limiting sleeve, a limiting ring is provided on the side of the limiting sleeve away from the bottom pad, and the limiting ring abuts against the adjacent side of the capacitor core.

[0009] As a further solution of the present invention: the lead-out strip is fixedly connected to the aluminum stem on the adjacent side, the aluminum stem passes through the sealing plug and is fixedly connected to a lead strip on the side away from the capacitor core, and the rubber pad is inserted into the buffer port.

[0010] As a further solution of the present invention: a fastening nail is installed in the middle of the rubber pad, the welding pin is crimped between the fastening nail and the rubber pad, a sealing ring is fitted between the inner side of the cover plate and the rubber pad, a gasket is provided on one side of the sealing ring, and the lead strip is crimped between the gasket and the fastening nail.

[0011] As a further solution of the present invention: the bottom surface of the welding pin is in contact with the rubber pad on the adjacent side and is separated from the cover plate on the adjacent side.

[0012] As a further solution of the present invention: the sealing ring is made of rubber, and the bottom area is larger than the bottom area of ​​the buffer port.

[0013] Beneficial effects of the present invention: 1. In the present invention, by installing a limiting sleeve inside the capacitor, the top of the limiting sleeve is abutted against the sealing plug to form a limit to the limiting sleeve, and the capacitor core is limitedly installed in the limiting sleeve, thereby realizing the limit of the capacitor core, the capacitor as a whole is more stable, and its purpose is to realize the determination of the natural frequency of the capacitor, so as to avoid resonance with the vibration due to the volatility of its own natural frequency during the vibration process, thereby achieving the purpose of improving the vibration resistance of the capacitor; On the other hand, the limit sleeve is made of rubber, and cooperates with the sleeve outside the capacitor and the rubber pad and sealing ring installed on the top, so that the whole contains a lot of materials that are very different from the circuit board material at the connection of the capacitor, which is intended to avoid resonance when connecting with the circuit board by using different materials; In addition, the limit sleeve, sleeve, rubber pad and sealing ring are all made of flexible materials, which will absorb part of the vibration energy during vibration, thereby reducing the vibration amplitude and further improving the vibration resistance; 2. In the present invention, a buffer port is provided at the cover plate, a rubber pad is installed in the buffer port, and a sealing ring that fits the rubber pad is provided on the inner side of the cover plate, and then the welding pin is installed between the rubber pad and the sealing ring. When the capacitor vibrates, part of its vibration energy is absorbed by the rubber pad and the sealing ring, which is intended to avoid the rigid connection between the welding pin and the main structure of the capacitor. When the main body of the capacitor vibrates with a large mass, its inertial vibration will be partially blocked when it is transmitted to the welding pin, thereby avoiding the welding pin from exceeding the fatigue limit of the welding point during frequent vibration, and effectively avoiding the influence of vibration on the service life of the capacitor; 3. In the present invention, since the installation of the limit sleeve and the rubber pad is based on the existing capacitor structure, the changes compared to the existing structure are relatively small and will not have a significant impact on the assembly line production. On the basis of improving the capacitor's anti-seismic ability, the inertial vibration effect of the capacitor body vibration on the welding point of the welding pin is partially blocked, so that the capacitor has the advantages of easy production, vibration resistance and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the accompanying drawings.

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a partial cross-sectional view of the present invention; Figure 3 It is a half-section structure schematic diagram of the present invention; Figure 4 The present invention Figure 3 A magnified detail of the center point A; Figure 5 It is a partial exploded view of the welding pin of the present invention.

[0016] In the figure: 1. sleeve; 2. aluminum tube; 3. bottom pad; 4. limiting sleeve; 5. capacitor core; 6. sealing plug; 7. lead strip; 8. aluminum stem; 9. cover plate; 10. buffer port; 11. rubber pad; 12. welding needle; 13. closing ring; 14. constricting tape; 15. liquid strip port; 16. liquid storage chamber; 17. limiting ring; 18. lead strip; 19. fastening nail; 20. sealing ring; 21. gasket. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figures 1 to 5 As shown, a vibration-resistant horn capacitor comprises a sleeve 1, an aluminum tube 2 is sleeved inside the sleeve 1, a bottom pad 3 is fixedly connected to the bottom side of the aluminum tube 2, a limiting sleeve 4 is inserted at the top of the bottom pad 3, a capacitor core 5 is limitedly installed inside the limiting sleeve 4, a sealing plug 6 is embedded inside the aluminum tube 2, the bottom surface of the sealing plug 6 is against the top of the limiting sleeve 4, lead strips 7 are arranged on both sides of the top of the capacitor core 5, two aluminum stems 8 are installed on both sides of the sealing plug 6 to adapt to the two lead strips 7, a cover plate 9 is fixedly connected to the top of the aluminum tube 2, buffer ports 10 are provided on both sides of the cover plate 9, a rubber pad 11 is installed inside the buffer port 10, a welding pin 12 is installed between the cover plate 9 and the rubber pad 11, and the rubber pad 11 is used to block the vibration of the welding pin 12; It should be noted that the sleeve 1 is a rubber hose as a whole, which fits the external shape of the aluminum tube 2; the bottom pad 3 and the cover plate 9 are respectively arranged at both ends of the aluminum tube 2, and the fixing method is welding; a closing ring 13 is arranged on the outside of the aluminum tube 2, and the sealing plug 6 is installed on the inner side of the closing ring 13, and a groove is arranged along the circumferential side surface for fitting with the inner side of the closing ring 13, thereby achieving a sealing effect on the bottom capacitor core 5, effectively preventing the internal electrolyte from entering one side of the welding needle 12, and avoiding leakage of the internal electrolyte.

[0019] like Figure 3 and Figure 4 As shown, the outer side of the capacitor core 5 is sleeved with a shrinking tape 14, the outer side of the shrinking tape 14 is against the inner side of the limiting sleeve 4, and liquid strip openings 15 are evenly arranged on the side of the shrinking tape 14. A liquid storage cavity 16 is arranged between the liquid strip opening 15 and the limiting sleeve 4. A limiting ring 17 is arranged on the side of the limiting sleeve 4 away from the bottom pad 3, and the limiting ring 17 is against the capacitor core 5 on the adjacent side. The limiting sleeve 4 is made of rubber; It should be noted that the capacitor core 5 inside the horn capacitor is composed of two electrolytic papers and two pole foils, which are wound from the outside to the inside by arranging the paper foils alternately. One pole foil is the cathode and the other pole foil is the anode. Since the composition structure of the rolled-up form is unstable, a shrinking tape 14 is sleeved on the outside of the roll-up. During the manufacturing process of the capacitor, the cavity between the bottom side of the sealing plug 6 and the top of the bottom pad 3 is injected with electrolyte so that the two pole foils can undergo electrolytic reaction. The shrinking tape 14 is used to shrink the pole foil. The sub-rolls of the capacitor core 5 are tightened to improve the stability of the capacitor core 5 as a whole structure. However, the capacitor core 5 of the capacitor is limited by the limiting sleeve 4 as a whole. In order to prevent the electrolyte from infiltrating the surrounding structure of the capacitor core 5, a liquid storage cavity 16 is provided between the limiting sleeve 4 and the shrinking tape 14, and liquid passage openings 15 are evenly provided on the surrounding side of the shrinking tape 14. The purpose is to ensure that the capacitor core 5 is stably limited, and the electrolyte is fully infiltrated to maintain the normal electrolysis work; Furthermore, since the top of the limiting sleeve 4 abuts against the bottom surface of the sealing plug 6, the outer side of the shrinking tape 14 abuts against the inner side of the limiting sleeve 4, the limiting ring 17 abuts against the capacitor core 5 on the adjacent side, and the sealing plug 6 is limited by the closing ring 13, the position of the limiting sleeve 4 is limited by the sealing plug 6, and the position of the capacitor core 5 is limited by the limiting sleeve 4, so as to achieve the stable limiting function of the capacitor core 5 inside the capacitor; Furthermore, when the rubber limiting sleeve 4 limits the capacitor core 5, when the outside of the capacitor is in a vibrating environment, the vibration can be effectively alleviated. There are three reasons for this. First, the limiting sleeve 4 on the capacitor core 5 will limit the natural frequency of the entire capacitor to a smaller range. The vibration reduction of the capacitor is essentially to reduce the resonance between it and the circuit board when it is installed on the circuit board, and the generation of the resonance phenomenon is related to the natural frequency of the capacitor itself. When the overall structure of the capacitor is in a stable state, its mass distribution will be determined, resulting in its resonant frequency being limited to a smaller range. Most of the frequencies of external vibrations cannot be in common with this frequency, and resonance cannot be formed, thereby achieving the purpose of reducing its vibration. On the contrary, when the capacitor core 5 inside the capacitor is in a shaking state, due to its uncertain mass distribution , its natural frequency is not fixed, so in a frequent vibration environment, its natural frequency will eventually be vibrated to the same frequency as the ambient vibration frequency, making it difficult to avoid resonance; secondly, different materials will increase the difference in resonance frequency, and the same or similar materials will have similar vibration frequencies, and are more likely to produce resonance. The rubber material of the limit sleeve 4 is quite different from the material of the circuit board at the capacitor installation position. When the circuit board vibrates, since the sleeve 1 and the limit sleeve 4 are respectively arranged inside and outside the capacitor, the overall vibration frequency is quite different from the vibration frequency of the circuit board, thereby effectively reducing the vibration phenomenon of the capacitor; thirdly, the limit sleeve 4 is a flexible material, which will absorb part of the vibration energy and weaken the vibration propagation, and part of the absorbed vibration energy will be dissipated in the form of heat energy; In addition, since the limiting sleeve 4 is a flexible material made of rubber, during the process of producing capacitors on the assembly line, the capacitor core 5 can be installed by pressing the capacitor core 5 into the limiting sleeve 4. During the pressing process, the limiting ring 17 deforms to adapt to the installation of the capacitor core 5, thereby effectively improving the vibration resistance of the capacitor without affecting the existing assembly line production.

[0020] like Figure 3 and Figure 5 As shown, the lead strip 7 is fixedly connected to the adjacent aluminum stem 8, the aluminum stem 8 passes through the sealing plug 6 and is fixedly connected to the lead strip 18 on the side away from the capacitor core 5, the rubber pad 11 is inserted into the buffer port 10, a fastening nail 19 is installed in the middle of the rubber pad 11, the welding pin 12 is crimped between the fastening nail 19 and the top of the rubber pad 11, a sealing ring 20 is attached between the inner side of the cover plate 9 and the rubber pad 11, a gasket 21 is arranged at the bottom of the sealing ring 20, and the lead strip 18 is crimped between the gasket 21 and the fastening nail 19; The side cross-section of the rubber pad 11 is T-shaped, and the bottom surface of the welding pin 12 is in contact with the rubber pad 11 on the adjacent side and is separated from the cover plate 9 on the adjacent side; It should be noted that the two lead-out bars 7 are respectively connected to the two pole foils of the capacitor core 5, and the two pole foils are respectively the cathode foil and the anode foil. The lead-out bars 7 are connected to the fastening nails 19 through the electrolyte environment inside the capacitor by welding the aluminum stems 8 and the lead strips 18, and the outer side of the fastening nails 19 is connected to the welding pins 12, thereby forming an electric circuit. On this basis, the rubber pads 11 installed on the cover plate 9 are used to block the vibration transmission of the capacitor to the welding pins 12; Specifically, the sealing ring 20 is made of rubber, and its outer peripheral side area is larger than the bottom surface area of ​​the buffer port 10, so that the buffer port 10 can be effectively covered, that is, the sealing of the capacitor is ensured. Furthermore, since the lead strip 18 is an aluminum strip, which is relatively soft, the two sides of the buffer port 10 where the welding pin 12 is installed are respectively a flexible rubber pad 11 and a sealing ring 20. When the capacitor is vibrated, its vibration energy is absorbed by the sealing ring 20 and the rubber pad 11 before being transmitted to the welding pin 12, so that its vibration energy is weakened when it is transmitted to the welding pin 12, thereby reducing the vibration amplitude of the welding pin 12. Compared with the prior art in which the welding pin 12 is directly rigidly connected to the main part of the capacitor, the sealing ring 20 is more convenient to use. When the capacitor is vibrated, the large-mass swing will be directly transmitted to the soldering pin 12, and the frequent large-mass inertial swing will quickly exceed the fatigue limit of the soldering point between the soldering pin 12 and the circuit board. On the other hand, the present invention, under the premise of ensuring the sealing and normal passage, absorbs the influence of the capacitor body vibration on the soldering pin 12 through the deformation of the sealing ring 20 and the rubber pad 11, so that the soldering pin 12 is separated from the vibrating body of the capacitor to a certain extent, avoiding the large-mass inertial shaking during rigid connection, thereby effectively extending the service life of the soldering point. The purpose of reducing the vibration of the capacitor is to extend the service life of the soldering point, which is beneficial to obtain vibration reduction benefits.

[0021] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A vibration-resistant horn capacitor, comprising a sleeve (1), an aluminum tube (2) being sleeved inside the sleeve (1), a bottom pad (3) being fixedly connected to the bottom of the aluminum tube (2), a sealing plug (6) being installed inside the aluminum tube (2), and a cover plate (9) being fixedly connected to the top, characterized in that: A limiting sleeve (4) is arranged at the top of the base pad (3), and the limiting sleeve (4) is made of rubber; a capacitor core (5) is installed inside the limiting sleeve (4) for limiting position, and lead strips (7) are arranged on both sides of the top of the capacitor core (5); aluminum stems (8) are installed on both sides of the sealing plug (6) to match the lead strips (7); buffer openings (10) are opened on both sides of the cover plate (9), and a rubber pad (11) is installed inside the buffer opening (10); a welding pin (12) is installed between the cover plate (9) and the rubber pad (11), and the rubber pad (11) is used to block the vibration of the welding pin (12).

2. A vibration-resistant horn capacitor according to claim 1, characterized in that: The sleeve (1) is made of rubber and fits with the outer side of the aluminum tube (2). A closing ring (13) is provided on the outer side of the aluminum tube (2). The sealing plug (6) is provided with a groove along the circumferential side and is embedded with the inner side of the closing ring (13).

3. A vibration-resistant horn capacitor according to claim 1, characterized in that: The outer side of the capacitor core (5) is sleeved with a contraction tape (14), the outer side of the contraction tape (14) abuts against the inner side of the limiting sleeve (4), the side surface of the contraction tape (14) is evenly provided with liquid passage openings (15), and a liquid storage cavity (16) is provided between the liquid passage opening (15) and the limiting sleeve (4).

4. A vibration-resistant horn capacitor according to claim 3, characterized in that: The bottom surface of the sealing plug (6) abuts against the adjacent side of the limiting sleeve (4); a limiting ring (17) is provided on the side of the limiting sleeve (4) away from the bottom pad (3); and the limiting ring (17) abuts against the adjacent side of the capacitor core (5).

5. A vibration-resistant horn capacitor according to claim 1, characterized in that: The lead strip (7) is fixedly connected to the aluminum stem (8) on the adjacent side, the aluminum stem (8) passes through the sealing plug (6) and is fixedly connected to a lead strip (18) on the side away from the capacitor core (5), and the rubber pad (11) is inserted into the buffer port (10).

6. A vibration-resistant horn capacitor according to claim 5, characterized in that: A fastening pin (19) is installed in the middle of the rubber pad (11), the welding pin (12) is crimped between the fastening pin (19) and the rubber pad (11), a sealing ring (20) is attached between the inner side of the cover plate (9) and the rubber pad (11), a gasket (21) is provided on one side of the sealing ring (20), and the lead strip (18) is crimped between the gasket (21) and the fastening pin (19).

7. A vibration-resistant horn capacitor according to claim 1, characterized in that: The bottom surface of the welding pin (12) is in contact with the rubber pad (11) on the adjacent side, and is separated from the cover plate (9) on the adjacent side.

8. A vibration-resistant horn capacitor according to claim 6, characterized in that: The sealing ring (20) is made of rubber, and has a bottom surface area that is larger than a bottom surface area of ​​the buffer port (10).

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