Shock-resistant electrolytic capacitor and use method thereof
Through a multi-layered anti-seismic system design, the failure problem of aluminum-shell electrolytic capacitors in complex vibration environments has been solved, achieving all-round protection and stable performance, and is suitable for automotive, industrial and new energy fields.
Patent Information
- Application Number
- CN202511580870.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-31
- Publication Date
- 2026-01-23
AI Technical Summary
Existing aluminum-cased electrolytic capacitors are prone to failure under complex vibration environments, lack multi-dimensional shock protection, are susceptible to fatigue fracture in lead connections, are prone to failure in sealing structures, and are prone to element displacement, leading to deterioration of capacitor performance.
The design employs a multi-layered seismic system, including an external rubber sleeve, internal filling cotton, and seismic rubber rings. Combined with limiting pressure rings, rubber ring pads, and support corner plates, it forms a comprehensive buffer and positioning structure, enhancing connection strength and sealing performance.
It significantly improves the reliability and performance stability of capacitors under vibration conditions, extends service life, reduces failure rate, and meets the requirements of harsh operating conditions.
Smart Images
Figure CN121394184A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of capacitive elements, in particular to an anti-shock electrolytic capacitor and a use method thereof. BACKGROUND
[0002] As a basic element for realizing energy storage, filtering, coupling and direct current isolation in electronic circuits, electrolytic capacitors have been widely used in key fields such as automotive electronics, industrial automation, new energy power generation, rail transit and aerospace supporting equipment. These application scenarios generally exist in complex and severe vibration environments, for example, 10-50Hz low-frequency jolt (amplitude 0.5-2mm) faced by cars driving on urban roads, 5-10m / s² impact vibration under off-road conditions, 500-2000Hz high-frequency resonance (amplitude 0.1-0.8mm) generated by industrial frequency converters during operation, and wind disturbance and transportation jolt encountered by photovoltaic inverters during outdoor installation. However, the current mainstream aluminum shell electrolytic capacitor has many shortcomings in the design of anti-shock structure, and it is difficult to adapt to the long-term stable operation requirements of the above working conditions, which has become a key bottleneck restricting the reliability of the equipment.
[0003] In the prior art, the anti-shock measures of aluminum shell electrolytic capacitors generally present the characteristics of "single and light weight", and lack systematic protection design. Some products only wrap a layer of 1-1.5mm thick natural rubber sleeve outside the aluminum shell. Such sleeve has poor aging resistance - its service life is less than 1000 hours in a high temperature environment of 85°C, and can only buffer the slight collision outside the aluminum shell, and cannot block the transmission of vibration to the internal components; another product attempts to fill polyethylene foam inside the aluminum shell, but the compression resilience rate of this material is only 60%-70%, and it is easy to deform plastically after long-term vibration, lose the buffering capacity, cause the direct impact of the element (the core energy storage component of the electrolytic capacitor) on the inner wall of the aluminum shell, and cause problems such as electrode foil folding and electrolyte leakage. After 1000 hours of vibration test, the capacitance attenuation rate is generally more than 15%, and the leakage current increases from the initial 5μA to more than 20μA; a few products set a solid circular rubber ring between the element and the aluminum shell, but this structure can only provide limited buffering in the radial direction, and cannot cope with the axial vibration (such as up and down impact when the car starts and stops), causing the upper and lower ends of the element to frequently contact the top and bottom of the aluminum shell, accelerating the aging and rupture of the element packaging layer, and shortening the service life of the element.
[0004] More prominent defects focus on the lead connection and sealing structure design: the connection of the aluminum lead and the terminal lead in the existing product adopts a simple soldering process (welding temperature 230-250 DEG C, weld diameter 2-3 mm), without any stress dispersion structure, under the action of repeated vibration, the weld is prone to fatigue cracks or even breakage, resulting in circuit breakage failure; the sealing of the lead exit part is mostly made of ordinary epoxy resin glue, which has strong rigidity and poor elasticity, and cannot buffer the vibration displacement of the lead, and is prone to peeling gap due to thermal expansion and contraction and the aluminum lead, so that the external moisture, dust and other impurities invade the inside of the aluminum shell, pollute the electrolyte, and further aggravate the performance degradation of the capacitor. At the same time, the existing product lacks precise limiting structure for the element, and the element is prone to radial deviation in the aluminum shell, resulting in mispositioning of the rubber ring pad, buffer failure, forming a vicious cycle of "vibration-deviation-protection failure-more severe vibration". Therefore, it has become a technical problem to be solved in the field of electronic components to develop a kind of electrolytic capacitor with multi-dimensional anti-vibration protection, stable and reliable structure, and suitable for severe vibration working conditions. SUMMARY
[0005] In view of the deficiencies of the prior art, the present application provides an anti-vibration electrolytic capacitor and a use method thereof, which solves the problems raised in the above background art.
[0006] To achieve the above purpose, the present application is realized by the following technical scheme: an anti-vibration electrolytic capacitor, comprising an aluminum shell, the outer part of the aluminum shell is wrapped with a rubber sleeve, the lower end of the aluminum shell is concave, the inner part of the aluminum shell is respectively attached with filling cotton and anti-vibration rubber ring, wherein the filling cotton is attached to the top of the aluminum shell, and the anti-vibration rubber ring is attached to the concave part of the aluminum shell;
[0007] The top end of the anti-vibration rubber ring is provided with an annular groove;
[0008] The bottom edge of the filling cotton is provided with a limiting pressure ring connected with the inner wall of the aluminum shell, and a plurality of annular hollow grooves are formed in the inner part of the filling cotton;
[0009] The inner part of the aluminum shell is also coaxially provided with an element, the top end of the element is embedded in the inner part of the limiting pressure ring and attached between the bottom end of the filling cotton, and the bottom edge of the element is matched with the annular groove;
[0010] The outer part of the element is sleeved with a plurality of rubber ring pads, and the rubber ring pads are arranged at the gap between the element and the aluminum shell;
[0011] The rubber ring pad is an annular structure with an elliptical hollow shape in the inner part;
[0012] The bottom end of the element is symmetrically provided with two lead seats, the lower part of the lead seat is attached with a limiting rubber plate, the edge of the limiting rubber plate is embedded in the inner part of the anti-vibration rubber ring, and the limiting rubber plate is penetrated by two aluminum leads connected with the lead seat;
[0013] The terminal lead is fixedly connected below the aluminum lead, and a plurality of supporting angle plates are fixedly connected at the connection position of the aluminum lead and the terminal lead.
[0014] The aluminum lead is wrapped by the sealing rubber.
[0015] Optionally, the rubber sleeve completely wraps the outer circumferential surface of the aluminum shell, and a silane coupling agent coating is coated on the inner wall of the rubber sleeve, which is used to enhance the close fit of the rubber sleeve and the outer wall of the aluminum shell, so as to avoid relative sliding or slipping between the rubber sleeve and the aluminum shell during vibration; the height of the rubber sleeve is matched with the height of the aluminum shell, so as to ensure that there is no exposed area outside the aluminum shell and to completely cover the aluminum shell to buffer external impact.
[0016] Optionally, the annular hollow groove is used to improve the elastic deformation capacity of the filling cotton, so that the filling cotton can buffer energy when subjected to vibration impact; the inner circle profile of the limiting pressure ring is matched with the outer circle profile of the top end of the element, the limiting pressure ring is fixedly connected with the bottom edge of the filling cotton through epoxy resin glue to form an integral structure, and the limiting pressure ring is used to limit the top end of the element in the radial direction after the top end of the element is embedded in the inside of the limiting pressure ring, so as to prevent the top end of the element from being offset in the radial direction in the aluminum shell.
[0017] Optionally, after the bottom edge of the element is embedded in the annular groove, the annular groove is used to limit the bottom end of the element in the radial direction, and the limiting of the top end of the element by the limiting pressure ring is combined to realize the axial positioning of the element in the aluminum shell; the holes opened on the limiting rubber plate correspond to the aluminum leads one by one, and the aluminum leads are radially constrained after passing through the holes, so as to avoid the aluminum leads from swinging at will during vibration; the edge of the limiting rubber plate and the inside of the shockproof rubber ring form an embedded fit, so as to ensure the installation stability of the limiting rubber plate on the shockproof rubber ring, and then the lead seat is axially supported by the limiting rubber plate.
[0018] Optionally, the elliptical hollow ring structure of the rubber ring pad can improve the deformation and buffering range of the rubber ring pad, and compared with a solid structure, the elliptical hollow design can provide elastic buffering in the radial and axial directions at the same time; a plurality of rubber ring pads are uniformly and interval distributed along the height direction of the element to form multiple buffering barriers, completely cover the gap between the element and the aluminum shell, and avoid the direct contact between the element and the aluminum shell; the outer edge of the rubber ring pad is kept in a fit state with the inner wall of the aluminum shell, which provides installation support for the rubber ring pad and also blocks the vibration transmission between the element and the aluminum shell through the elastic deformation of the rubber ring pad.
[0019] Optionally, the support gusset enhances the structural strength of the connection between the aluminum lead and the terminal lead through the stability structure of a triangle; a plurality of support gussets are uniformly distributed radially around the connection point of the aluminum lead and the terminal lead, ensuring that the stress of the connection point is balanced in all directions, and avoiding stress concentration at the connection point due to uneven stress during vibration; the aluminum lead and the terminal lead are firmly connected through resistance welding, and the connection between the support gusset and the lead is also fixed by welding, further strengthening the anti-vibration ability of the connection node.
[0020] Optionally, the inner concave structure at the lower end of the aluminum shell is adapted to the outer peripheral contour of the anti-vibration rubber ring, and after the anti-vibration rubber ring is embedded in the inner concave structure, the inner concave structure is used to limit the anti-vibration rubber ring in the radial direction to prevent the anti-vibration rubber ring from shifting inside the aluminum shell; the inner wall of the aluminum shell is treated to be smooth to reduce the frictional resistance between the inner wall of the aluminum shell and the filling cotton and the rubber ring pad, and to avoid long-term vibration causing component wear; the sealing rubber completely wraps the outer peripheral surface of the aluminum lead through a pressure injection process, and at the same time tightly adheres to the lower end surface of the limiting rubber plate to form a sealed structure, which not only buffers the vibration displacement of the aluminum lead, but also blocks foreign matter from entering the inside of the aluminum shell.
[0021] A method for using an anti-vibration electrolytic capacitor, comprising the following steps:
[0022] S1, select an aluminum alloy profile to process an aluminum shell with an inner concave structure, and ensure that the inner wall of the aluminum shell is smooth during processing to reduce subsequent component wear; after processing is completed, the aluminum shell is cleaned to remove surface residual aluminum chips and oil stains, and after cleaning, the aluminum shell is dried, and after it is naturally cooled to room temperature, it is ready for use.
[0023] S2, a rubber sleeve made of nitrile rubber material is made to match the height and outer diameter of the aluminum shell, ensuring that the rubber sleeve can completely wrap the outside of the aluminum shell; an anti-vibration rubber ring with a ring-shaped groove at the top end is formed by a fluororubber through a molding process, and the ring-shaped groove needs to match the bottom end edge of the element; after the rubber ring is formed, the surface burrs are removed and the edges are arranged flat for use.
[0024] S3, the filling cotton is processed into a filling cotton with a ring-shaped hollow groove, which can improve the elastic buffering capacity of the filling cotton; at the same time, a limiting pressure ring is injection molded, and the inner ring of the limiting pressure ring needs to match the outer peripheral contour of the top end of the element; when assembling, epoxy resin glue is applied to the upper end surface of the limiting pressure ring, which is adhered to the bottom end edge of the filling cotton and ensures that the two are coaxially aligned, and after being adhered, it is subjected to curing treatment, and after curing is completed, it is ready for use.
[0025] S4, a rubber ring pad made of silicone rubber is evenly sleeved on the outside of the element along the height direction, and the rubber ring pad needs to fill the gap between the element and the aluminum shell; then the lead seat is welded to the bottom end of the element, ensuring that the welding is firm and there is no virtual welding; after welding is completed, the top end of the element is embedded in the limiting pressure ring, and at the same time, the bottom end edge of the element is clamped into the ring-shaped groove of the anti-vibration rubber ring, achieving the preliminary positioning of the element.
[0026] S5, the epoxy glass cloth board is processed into a limiting rubber plate with holes, the positions and number of the holes need to correspond to the lead seat; the edge of the limiting rubber plate is embedded into the inside of the anti-vibration rubber ring to ensure stable installation of the limiting rubber plate; then one end of the aluminum lead is welded on the lead seat, the other end passes through the hole of the limiting rubber plate, and after welding, the perpendicularity of the aluminum lead is corrected to avoid the inclination of the aluminum lead affecting subsequent assembly.
[0027] S6, the brass plate is processed into a support angle plate, the support angle plate needs to be an isosceles right triangle to utilize the stability of the triangle to enhance the connection strength; the aluminum lead is aligned and welded with the terminal lead, after welding, the support angle plate is evenly distributed around the lead connection and welded and fixed to ensure the uniform spacing between adjacent support angle plates and realize all-round reinforcement of the lead connection.
[0028] S7, butyl rubber is used to wrap the aluminum lead by pressure injection process to form a sealing rubber, which ensures that the sealing rubber is tightly attached to the aluminum lead and the limiting rubber plate to realize sealing; after pressure injection, the sealing rubber is cured, after the sealing rubber is cured, all the assembled parts are put into the pretreated aluminum shell, and finally the rubber sleeve is sleeved to complete the overall assembly of the anti-vibration electrolytic capacitor.
[0029] The application provides an anti-vibration electrolytic capacitor and a use method thereof, which has the following beneficial effects:
[0030] The anti-vibration electrolytic capacitor and the use method thereof completely solve the core problem that the electrolytic capacitor in the prior art is prone to failure under complex vibration conditions, and achieve significant breakthroughs in structural reliability, performance stability and production applicability, and have high technical value and practical significance;
[0031] The application constructs a three-layer anti-vibration system to realize all-round protection of the capacitor as a whole and key components; the external nitrile rubber sleeve has excellent oil resistance and aging resistance, can absorb a large amount of external low-frequency vibration energy through elastic deformation, and avoids that the aluminum shell directly bears the impact; the polyurethane filling cotton in the aluminum shell is provided with an annular hollow groove, which can adapt to vibration impact in different directions while being lightweight, quickly attenuate the axial vibration of the element top, and after long-term vibration test, the axial displacement of the element is controlled in a very small range, which is much better than existing products; the adaptive design of the anti-vibration rubber ring and the concave structure of the aluminum shell, combined with the fixation of the limiting pressure ring to the element top, forms "double-directional limiting", effectively prevents the axial movement of the element in severe vibration, and avoids the hard contact between the element and the aluminum shell.
[0032] Secondly, the elliptical hollow rubber ring pad shows excellent buffering performance - the elliptical structure can buffer a large amount of vibration energy in the radial and axial directions respectively, compared with the existing solid circular rubber ring, the buffering efficiency is greatly improved, and the hollow design further enhances the deformation adaptability, avoiding the aging and hardening of the rubber ring pad due to long-term extrusion; The brass support angle plate at the lead connection part is firmly connected with the aluminum lead and the terminal lead through resistance welding, which can effectively disperse the vibration stress, and after multiple bending tests, there is no cracking phenomenon at the lead connection, while the existing products usually crack at the welding point after a few times of bending, which significantly improves the fatigue resistance of the lead connection;
[0033] And the butyl rubber seal is tightly attached to the aluminum shell and aluminum lead through the pressure injection process, and the inside of the aluminum shell can still remain dry and clean after long-term wet heat test, effectively preventing moisture and impurities from entering; At the same time, the elasticity of butyl rubber can buffer the small vibration displacement of the lead, preventing the peeling of the rubber layer and the lead, further ensuring the cleanliness of the internal environment; In addition, the concave structure of the aluminum shell not only provides a stable installation space for the shock-resistant rubber ring, but also enhances the impact resistance of the aluminum shell itself, avoiding deformation of the aluminum shell in severe vibration;
[0034] The average failure-free working time of the electrolytic capacitor of the present application under vibration conditions is greatly improved, meeting the severe needs of automotive electronics and industrial control; After long-term vibration test, the capacity attenuation rate and leakage current remain at an excellent level, and the performance stability is far superior to existing products; At the same time, all parts of the present application are processed by standardized equipment, and the process is clear and controllable, suitable for mass production, which not only ensures the advanced technology, but also effectively controls the production cost, and can be widely promoted to the fields of automobile, industry, new energy, etc., providing key support for the improvement of equipment reliability. BRIEF DESCRIPTION OF DRAWINGS
[0035] Figure 1 It is a front view of the present application;
[0036] Figure 2 It is a front view of the present application;
[0037] Figure 3 It is a front view of the present application;
[0038] Figure 4 It is a front view of the present application;
[0039] Figure 5 It is a front view of the present application;
[0040] Figure 6 It is a front view of the present application.
[0041] In the figure: 1, aluminum shell; 2, rubber sleeve; 3, filling cotton; 4, anti-vibration rubber ring; 5, limiting pressure ring; 6, element; 7, rubber ring pad; 8, lead seat; 9, limiting rubber plate; 10, aluminum lead; 11, terminal lead; 12, support angle plate; 13, sealing rubber. DETAILED DESCRIPTION
[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments of the present application.
[0043] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0044] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0045] Please refer to Figures 1 to 6 The present application provides a technical solution: an anti-vibration electrolytic capacitor and a use method thereof, comprising an aluminum shell 1, the outer part of the aluminum shell 1 is wrapped with a rubber sleeve 2, the lower end of the aluminum shell 1 is concave, the inner part of the aluminum shell 1 is respectively attached with filling cotton 3 and anti-vibration rubber ring 4, wherein the filling cotton 3 is attached to the top of the aluminum shell 1, and the anti-vibration rubber ring 4 is attached to the concave part of the aluminum shell 1;
[0046] The top end of the anti-vibration rubber ring 4 is provided with an annular groove;
[0047] The bottom end edge of the filling cotton 3 is provided with a limiting pressure ring 5 connected with the inner wall of the aluminum shell 1, and a plurality of annular hollow grooves are formed in the inner part of the filling cotton 3;
[0048] The inner part of the aluminum shell 1 is also coaxially provided with an element 6, the top end of the element 6 is embedded in the inner part of the limiting pressure ring 5 and attached between the bottom end of the filling cotton 3, and the bottom end edge of the element 6 is matched with the annular groove;
[0049] The element 6 is externally sleeved with a plurality of rubber ring pads 7, which are arranged at the gap between the element 6 and the aluminum shell 1;
[0050] The rubber ring pad 7 is arranged in a ring structure with an elliptical hollow shape inside;
[0051] The bottom end of the element 6 is symmetrically provided with two lead seats 8, and the lower side of the lead seat 8 is attached to a limiting rubber plate 9, the edge of the limiting rubber plate 9 is embedded in the inside of the anti-vibration rubber ring 4, and the limiting rubber plate 9 penetrates two aluminum leads 10 connected with the lead seat 8;
[0052] The lower side of the aluminum lead 10 is fixedly connected with a terminal lead 11, and a plurality of support angle plates 12 are fixedly connected at the connection position of the aluminum lead 10 and the terminal lead 11, and the support angle plates 12 are evenly distributed at equal angles;
[0053] The aluminum lead 10 is wrapped with a sealing rubber 13 around the periphery.
[0054] In this embodiment, as shown in Figure 1 , Figure 2 and Figure 3 , the rubber sleeve 2 completely wraps the outer circumferential surface of the aluminum shell 1, and the inner wall of the rubber sleeve 2 is coated with a silane coupling agent coating, which is used to enhance the close fit between the rubber sleeve 2 and the outer wall of the aluminum shell 1, so as to avoid relative sliding or slipping between the rubber sleeve 2 and the aluminum shell 1 during the vibration process of the capacitor; the height of the rubber sleeve 2 is matched with the height of the aluminum shell 1, so as to ensure that there is no exposed area outside the aluminum shell 1, and the aluminum shell 1 is fully covered to buffer external impact.
[0055] In this embodiment, as shown in Figure 1 and Figure 5 , the annular hollow groove is used to improve the elastic deformation capacity of the filling cotton 3, so as to buffer the energy when the filling cotton 3 is subjected to vibration impact; the inner circle profile of the limiting pressure ring 5 is matched with the outer circle profile of the top end of the element 6, the limiting pressure ring 5 is fixedly connected with the bottom edge of the filling cotton 3 through epoxy resin glue, forming an integral structure, and after the top end of the element 6 is embedded in the inside of the limiting pressure ring 5, the limiting pressure ring 5 is used to limit the top end of the element 6 in the radial direction, preventing the top end of the element 6 from being offset in the radial direction inside the aluminum shell 1.
[0056] In this embodiment, as shown in Figure 1 and Figure 5As shown, after the bottom end edge of the element 6 is embedded in the annular groove, the annular groove is used to limit the bottom end of the element 6 in the radial direction, and cooperates with the limiting pressure ring 5 to limit the top end of the element 6, so as to realize the axial positioning of the element 6 in the aluminum shell 1; the holes opened on the limiting rubber plate 9 correspond to the aluminum lead 10 one by one, and after the aluminum lead 10 passes through the holes, the aluminum lead 10 is constrained in the radial direction, so as to avoid the aluminum lead 10 from swinging randomly in the vibration; the edge of the limiting rubber plate 9 forms an embedded cooperation with the inside of the anti-vibration rubber ring 4, so as to ensure the installation stability of the limiting rubber plate 9 on the anti-vibration rubber ring 4, and then the lead seat 8 is axially supported by the limiting rubber plate 9.
[0057] In the embodiment, as shown in Figure 1 , Figure 2 and Figure 5 , the elliptical hollow ring structure of the rubber ring pad 7 can improve the deformation buffer range of the rubber ring pad 7, and compared with the solid structure, the elliptical hollow design can provide elastic buffer in the radial and axial directions at the same time; a plurality of rubber ring pads 7 are uniformly and spacedly distributed along the height direction of the element 6, so as to form a plurality of buffer barriers and comprehensively cover the gap between the element 6 and the aluminum shell 1, so as to avoid the direct contact between the element 6 and the aluminum shell 1; the outer edge of the rubber ring pad 7 is kept in a state of being attached to the inner wall of the aluminum shell 1, which not only provides installation support for the rubber ring pad 7, but also can block the vibration transmission between the element 6 and the aluminum shell 1 through the elastic deformation of the rubber ring pad 7.
[0058] In the embodiment, as shown in Figure 1 , Figure 4 and Figure 6 , the support angle plate 12 enhances the structural strength of the connection between the aluminum lead 10 and the terminal lead 11 through the stability structure of the triangle; a plurality of support angle plates 12 are uniformly distributed in a radial manner around the connection point of the aluminum lead 10 and the terminal lead 11, so as to ensure the balanced stress in all directions of the connection, and avoid stress concentration of the connection due to uneven stress in the vibration process; the aluminum lead 10 and the terminal lead 11 are firmly connected through resistance welding, and the support angle plate 12 and the lead connection are also fixed by welding, so as to further strengthen the anti-vibration capability of the connection node.
[0059] In the embodiment, as shown in Figure 1 , the inner concave structure of the lower end of the aluminum shell 1 is matched with the outer peripheral contour of the anti-vibration rubber ring 4, and after the anti-vibration rubber ring 4 is embedded in the inner concave structure, the inner concave structure is used to limit the anti-vibration rubber ring 4 in the radial direction, so as to prevent the anti-vibration rubber ring 4 from being displaced in the aluminum shell 1; the inner wall of the aluminum shell 1 is treated by smoothing, so as to reduce the friction resistance between the inner wall of the aluminum shell 1 and the filling cotton 3 and the rubber ring pad 7, and avoid the abrasion of components caused by long-term vibration; the sealing rubber 13 completely wraps the outer peripheral surface of the aluminum lead 10 through the pressure injection process, and is tightly attached to the lower end surface of the limiting rubber plate 9, so as to form a sealed structure, which not only buffers the vibration displacement of the aluminum lead 10, but also blocks the impurities from entering the aluminum shell 1.
[0060] A method for using an anti-vibration electrolytic capacitor, comprising the following steps:
[0061] S1, select aluminum alloy profile to process into aluminum shell 1 with concave structure, ensure the smoothness of the inner wall of the aluminum shell 1 during processing to reduce the wear of subsequent parts; after processing, clean the aluminum shell 1 to remove surface residual aluminum chips and oil stains, dry the aluminum shell 1 after cleaning, and naturally cool it to room temperature for standby.
[0062] S2, use butyl rubber material to make rubber sleeve 2 with height and outer diameter matching the aluminum shell 1, ensure that the rubber sleeve 2 can completely wrap the outside of the aluminum shell 1; use fluororubber to form an anti-vibration rubber ring 4 with a ring groove at the top by molding process, the ring groove needs to match the bottom edge of the element 6, and the rubber ring is formed after removing the surface burrs and is ready for use.
[0063] S3, process the polyurethane foam into a filling cotton 3 with a ring-shaped hollow groove, which can improve the elastic buffer capacity of the filling cotton 3; at the same time, injection molding a limiting pressure ring 5, the inner circle of the limiting pressure ring 5 needs to match the top end outer contour of the element 6; during assembly, apply epoxy resin glue on the upper end surface of the limiting pressure ring 5, and bond it to the bottom end edge of the filling cotton 3 and ensure that the two are coaxial and aligned, and after bonding, perform curing treatment, and after curing, it is ready for use.
[0064] S4, evenly coat the rubber ring pad 7 made of silicone rubber on the outside of the element 6 along the height direction, the rubber ring pad 7 needs to fill the gap between the element 6 and the aluminum shell 1; then weld the lead seat 8 to the bottom end of the element 6, ensuring firm welding without virtual welding; after welding, embed the top end of the element 6 into the inside of the limiting pressure ring 5, and at the same time, the bottom edge of the element 6 is inserted into the ring groove of the anti-vibration rubber ring 4, realizing the preliminary positioning of the element 6.
[0065] S5, process the epoxy glass cloth board into a limiting rubber plate 9 with holes, the position and number of the holes need to correspond to the lead seat 8; embed the edge of the limiting rubber plate 9 into the inside of the anti-vibration rubber ring 4 to ensure stable installation of the limiting rubber plate 9; then weld one end of the aluminum lead 10 to the lead seat 8, and the other end passes through the hole of the limiting rubber plate 9, and after welding, correct the perpendicularity of the aluminum lead 10 to avoid the skew of the aluminum lead 10 affecting the subsequent assembly.
[0066] S6, process the brass plate into a support angle plate 12, which needs to be an isosceles right triangle to enhance the connection strength by utilizing the stability of the triangle; align and weld the aluminum lead 10 with the terminal lead 11, after welding, evenly distribute and weld the support angle plate 12 around the lead connection, ensure the consistent spacing between adjacent support angle plates 12, and realize the all-round reinforcement of the lead connection.
[0067] S7, the butyl rubber is used to wrap the aluminum lead 10 by the injection process to form the sealing rubber 13, to ensure that the sealing rubber 13 is tightly attached to the aluminum lead 10 and the limiting rubber plate 9 to realize sealing; after the injection is completed, the sealing rubber 13 is cured, and after the sealing rubber 13 is cured, all the assembled parts are integrally assembled into the pretreated aluminum shell 1, and finally the rubber sleeve 2 is sleeved, and the overall assembly of the anti-vibration electrolytic capacitor is completed.
[0068] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.
Claims
1. An anti-shock type electrolytic capacitor comprising an aluminum case (1), characterized by: The outer part of the aluminum shell (1) is wrapped with a rubber sleeve (2), the lower end of the aluminum shell (1) is concave, the inner part of the aluminum shell (1) is respectively attached with filling cotton (3) and anti-vibration rubber ring (4), wherein the filling cotton (3) is attached to the top of the aluminum shell (1), and the anti-vibration rubber ring (4) is attached to the concave part of the aluminum shell (1); The top end of the anti-vibration rubber ring (4) is provided with an annular groove; The bottom edge of the filling cotton (3) is provided with a limiting pressure ring (5) connected with the inner wall of the aluminum shell (1), and a plurality of annular hollow grooves are formed in the inner part of the filling cotton (3); The inner part of the aluminum shell (1) is also coaxially provided with a element (6), the top end of the element (6) is embedded in the inner part of the limiting pressure ring (5) and attached between the bottom end of the filling cotton (3), and the bottom edge of the element (6) is matched with the annular groove; The outer part of the element (6) is wrapped with a plurality of rubber ring pads (7), and the rubber ring pads (7) are arranged at the gap between the element (6) and the aluminum shell (1); The rubber ring pad (7) is in the form of an annular structure with an elliptical hollow in the inner part; The bottom end of the element (6) is symmetrically provided with two lead frames (8), the lower part of the lead frame (8) is attached with a limiting rubber plate (9), the edge of the limiting rubber plate (9) is embedded in the inner part of the anti-vibration rubber ring (4), and the limiting rubber plate (9) is penetrated by two aluminum leads (10) connected with the lead frame (8); The lower part of the aluminum lead (10) is fixedly connected with a terminal lead (11), a plurality of supporting angle plates (12) are further fixedly connected at the connection part between the aluminum lead (10) and the terminal lead (11), and the supporting angle plates (12) are evenly distributed at equal angles. The periphery of the aluminum lead (10) is wrapped with a sealing rubber (13).
2. The anti-shock type electrolytic capacitor according to claim 1, wherein: The rubber sleeve (2) completely wraps the outer circumferential surface of the aluminum shell (1), the inner wall of the rubber sleeve (2) is coated with a silane coupling agent coating, which is used to enhance the close attachment between the rubber sleeve (2) and the outer wall of the aluminum shell (1), so as to avoid the relative sliding or slipping between the rubber sleeve (2) and the aluminum shell (1) during the vibration of the capacitor; the height of the rubber sleeve (2) is matched with the height of the aluminum shell (1), so as to ensure that there is no exposed area on the outer part of the aluminum shell (1) and to completely cover the aluminum shell (1) to buffer external impact.
3. The shock-resistant electrolytic capacitor according to claim 2, wherein: The annular hollow groove is used to improve the elastic deformation capacity of the filling cotton (3), so that the filling cotton (3) can buffer energy when subjected to vibration impact; the inner circle profile of the limiting pressure ring (5) is matched with the outer periphery profile of the top end of the element (6), the limiting pressure ring (5) is fixedly connected with the bottom edge of the filling cotton (3) through epoxy resin glue, forming an integral structure, and after the top end of the element (6) is embedded in the inner part of the limiting pressure ring (5), the limiting pressure ring (5) is used to limit the top end of the element (6) in the radial direction, preventing the top end of the element (6) from being radially offset in the aluminum shell (1).
4. The shock-resistant electrolytic capacitor according to claim 3, wherein: The bottom edge of the element (6) is embedded in the annular groove, and the annular groove is used for radially limiting the bottom end of the element (6), cooperating with the limiting pressure ring (5) to limit the top end of the element (6), so as to realize the axial positioning of the element (6) in the aluminum shell (1); The holes in the limiting rubber plate (9) correspond one-to-one with the aluminum leads (10), and the aluminum leads (10) are radially constrained after passing through the holes, so as to avoid the aluminum leads (10) from swinging randomly in vibration; The edge of the limiting rubber plate (9) is embedded in the anti-vibration rubber ring (4) to ensure the stability of the limiting rubber plate (9) on the anti-vibration rubber ring (4), and then the lead holder (8) is axially supported by the limiting rubber plate (9).
5. The shock-resistant electrolytic capacitor according to claim 4, wherein: The oval hollow annular structure of the rubber ring pad (7) can improve the deformation buffer range of the rubber ring pad (7), and compared with the solid structure, the oval hollow design can provide elastic buffer in the radial and axial directions at the same time; A plurality of rubber ring pads (7) are uniformly distributed along the height direction of the element (6) to form a plurality of buffer barriers and cover the gap between the element (6) and the aluminum shell (1) comprehensively, so as to avoid the direct contact between the element (6) and the aluminum shell (1); The outer edge of the rubber ring pad (7) is in a state of close contact with the inner wall of the aluminum shell (1), which not only provides installation support for the rubber ring pad (7), but also blocks the transmission of vibration between the element (6) and the aluminum shell (1) through the elastic deformation of the rubber ring pad (7).
6. The shock-resistant electrolytic capacitor according to claim 5, wherein: The support angle plate (12) enhances the structural strength of the connection between the aluminum lead (10) and the terminal lead (11) through the stability of the triangular structure; A plurality of support angle plates (12) are uniformly distributed radially around the connection point of the aluminum lead (10) and the terminal lead (11), so as to ensure the balanced force in all directions of the connection and avoid stress concentration of the connection due to uneven force in the vibration process; The aluminum lead (10) and the terminal lead (11) are firmly connected by resistance welding, and the support angle plate (12) is also fixed by welding at the lead connection, which further strengthens the anti-vibration ability of the connection node.
7. The shock-resistant electrolytic capacitor according to claim 6, wherein: The inner concave structure of the lower end of the aluminum shell (1) is matched with the outer contour of the anti-vibration rubber ring (4), and after the anti-vibration rubber ring (4) is embedded in the inner concave structure, the inner concave structure is used for radially limiting the anti-vibration rubber ring (4) to prevent the anti-vibration rubber ring (4) from moving in the aluminum shell (1); The inner wall of the aluminum shell (1) is treated to be smooth to reduce the friction resistance between the inner wall of the aluminum shell (1) and the filling cotton (3) and the rubber ring pad (7), and to avoid long-term vibration causing component wear; The sealing rubber (13) completely wraps the outer surface of the aluminum lead (10) by pressure injection process, and is tightly attached to the lower end surface of the limiting rubber plate (9) to form a sealed structure, which not only buffers the vibration displacement of the aluminum lead (10), but also blocks the impurities from entering the inside of the aluminum shell (1).
8. A method of using the anti-shock electrolytic capacitor according to any one of claims 1 to 7, characterized by, The method comprises the following steps: S1, select an aluminum alloy profile to process an aluminum shell (1) with an inner concave structure, and ensure that the inner wall of the aluminum shell (1) is smooth during processing to reduce subsequent component wear; After processing, the aluminum shell (1) is cleaned to remove surface residual aluminum chips and oil stains, and then the aluminum shell (1) is dried and naturally cooled to room temperature before use; S2, adopt nitrile rubber material made with aluminum shell (1) height, outer diameter of the rubber sleeve (2) to ensure that the rubber sleeve (2) can be completely wrapped around the outside of the aluminum shell (1); using fluorine rubber by molding process to form the top of the anti-vibration rubber ring (4) with ring groove, ring groove needs to be adapted to the bottom edge of the element (6), the rubber ring after forming the surface of the burr, tidy and ready for use; S3, the polyurethane foam into a hollow ring groove filled with cotton (3), ring hollow groove can improve the elastic buffer capacity of the filling cotton (3); while injection molding limiting pressure ring (5), the inner ring of the limiting pressure ring (5) needs to match the top of the element (6) outer contour; assembly in the limiting pressure ring (5) on the upper surface of the epoxy resin glue, will be bonded in the filling cotton (3) bottom edge and ensure that the two coaxial alignment, after bonding to cure, curing is completed after the ready; S4, in the element (6) outside along the height direction evenly on the rubber ring pad (7) made of silicone rubber, rubber ring pad (7) needs to fill the gap between the element (6) and the aluminum shell (1); then the lead seat (8) is welded at the bottom of the element (6), to ensure that the welding is firm without virtual welding; after welding, the top of the element (6) is embedded in the limiting pressure ring (5) inside, while the bottom edge of the element (6) is inserted into the ring groove of the anti-vibration rubber ring (4), realizing the preliminary positioning of the element (6); S5, the epoxy glass cloth board into a limiting rubber plate (9) with holes, the position and number of holes need to correspond to the lead seat (8); the edge of the limiting rubber plate (9) is embedded in the anti-vibration rubber ring (4) inside, to ensure that the limiting rubber plate (9) is installed stably; then the aluminum lead (10) is welded on one end of the lead seat (8), and the other end is inserted through the hole of the limiting rubber plate (9); after welding, the perpendicularity of the aluminum lead (10) is corrected to avoid the skew of the aluminum lead (10) affecting the subsequent assembly; S6, the brass plate is processed into a support angle plate (12), which needs to be an isosceles right triangle to enhance the connection strength by using the stability of the triangle; The aluminum lead (10) and the terminal lead (11) are aligned and welded. After welding, the support angle plate (12) is evenly distributed around the lead connection and welded to ensure that the adjacent support angle plates (12) have consistent spacing, realizing the all-round reinforcement of the lead connection; S7, adopt butyl rubber by pressure injection process to wrap the aluminum lead (10), forming a sealing rubber (13), to ensure that the sealing rubber (13) is tightly attached to the aluminum lead (10) and the limiting rubber plate (9) to realize sealing; after pressure injection, the sealing rubber (13) is cured; after the sealing rubber (13) is cured, all the assembled parts are put into the pretreated aluminum shell (1); finally, the rubber sleeve (2) is put on, completing the overall assembly of the anti-vibration electrolytic capacitor.