Capacitor

Abstract

The invention discloses a capacitor, and relates to the technical field of capacitors, and the capacitor comprises a housing, a supporting seat, and a capacitor core. The shell is provided with a containing cavity, and the bottom wall of the shell is provided with an outlet pipe communicated with the containing cavity. The supporting seat is installed in the containing cavity and comprises a bottom support and a ventilation pipe which are connected, the bottom support is located on the side, close to the outlet pipe, in the containing cavity, and the ventilation pipe is communicated with the outlet pipe. The capacitor core comprises a core shaft, a through hole is formed in the core shaft in the axial direction, the capacitor core is installed on the bottom support, and the ventilation pipe is arranged in the through hole in a penetrating mode and extends to the side, away from the side where the outlet pipe is arranged, of the shell. According to the capacitor provided by the invention, the heat dissipation efficiency of the capacitor can be improved, and the risk of deformation or explosion of the capacitor core due to too high temperature is reduced.

Description

Technical Field

[0001] This application relates to the field of capacitor technology, specifically to a capacitor. Background Technology

[0002] Existing DC-supported capacitors continuously generate Joule heat during the operation of energy storage and transmission. Over time, the temperature continues to rise, and the capacitor core will generate internal stress due to thermal expansion. On the one hand, this will accelerate the aging of the capacitor core dielectric and shorten the service life of the capacitor. On the other hand, it will easily cause the capacitor to deform or explode, seriously affecting the safety of the capacitor.

[0003] Existing technologies employ heat-conducting or auxiliary heat-dissipating structures located inside or outside the capacitor casing to transfer heat from around the capacitor core to the outside of the casing, thereby reducing the temperature of the capacitor core. However, the heat dissipation path of this method is relatively long, and the temperature at the center of the capacitor core is difficult to dissipate in time, resulting in low heat dissipation efficiency.

[0004] Therefore, there is an urgent need to propose a capacitor to solve the problems existing in the current technology. Summary of the Invention

[0005] The purpose of this application is to provide a capacitor that can improve the heat dissipation efficiency of the capacitor and reduce the risk of the capacitor core deforming or bursting due to excessive temperature.

[0006] This application provides a capacitor, including a housing, a support, and a capacitor core. The housing has a receiving cavity, and the bottom wall of the housing has a lead-out tube communicating with the receiving cavity. The support is installed in the receiving cavity and includes a base and a ventilation tube connected to it. The base is located in the receiving cavity on the side near the lead-out tube, and the ventilation tube communicates with the lead-out tube. The capacitor core includes a spindle with a through hole along its axial direction. The capacitor core is installed on the base, and the ventilation tube passes through the through hole and extends to the side of the housing away from where the lead-out tube is located.

[0007] By incorporating interconnected lead-out pipes, ventilation pipes, and through holes, an independent, axially continuous heat dissipation channel can be formed inside the capacitor. This channel, located along the central axis of the capacitor core, facilitates rapid heat dissipation from the core's center, reducing the risk of deformation or cracking due to excessive internal temperature and improving the capacitor's safety. Simultaneously, the ventilation pipes on the support base also help position the capacitor core, improving assembly stability and ensuring reliable capacitor operation while enhancing heat dissipation efficiency.

[0008] In some examples, the capacitor also includes a cover located on the side of the housing away from the lead tube. The cover has a positioning hole, and the positioning hole, through hole, ventilation tube, and lead tube are coaxially arranged on the central axis of the capacitor core. The end of the ventilation tube away from the base is inserted into the positioning hole.

[0009] By setting positioning holes on the cover, the end of the ventilation pipe away from the base can be inserted into the positioning holes to fix the ventilation pipe in the axial and radial directions. This not only helps to improve the assembly stability of the support base but also allows the ventilation pipe to connect to the external environment at both ends for ventilation and heat dissipation.

[0010] In some examples, an assembly gap is formed between the outer peripheral wall of the ventilation duct and the wall of the through hole.

[0011] The ventilation duct and the through hole of the mandrel are fitted with a clearance fit, which makes it easy for the ventilation duct to pass through the through hole during the assembly process. This avoids damage to the ventilation duct, mandrel or capacitor core caused by an overly tight fit between the ventilation duct and the mandrel. It helps to maintain the structural stability of each component without affecting ventilation and heat dissipation.

[0012] In some examples, the cover includes a mounting part and a terminal block. The sidewall of the mounting part has a raised edge, and the two opposite sides of the raised edge have first ears with first snap-fit ​​structures. The two opposite sides of the terminal block have second ears with second snap-fit ​​structures. The first snap-fit ​​structures and the second snap-fit ​​structures are snapped together along the axial direction of the capacitor.

[0013] The mounting section and the terminal block are axially snapped together using a first and a second snap-fit ​​structure. This allows for quick alignment and fixation of the terminal block with the mounting section after wiring, eliminating the complex operations of rotation or threaded tightening in traditional solutions and improving assembly efficiency. Simultaneously, the axial snap-fit ​​fixing method helps maintain the axial alignment of the positioning holes with the ventilation duct, facilitating assembly without interfering with the heat dissipation path.

[0014] In some examples, the capacitor also includes an insulating element comprising an integrally formed connector and a baffle, the connector being inserted into a through hole and the baffle covering a portion of the first electrode of the capacitor core.

[0015] The inclusion of insulating components effectively prevents short circuits between electrodes, improving the safety of capacitor use. The insulating components are installed on the capacitor core via connectors inserted into the through-holes, simplifying assembly without affecting heat dissipation from the through-holes and ventilation pipes.

[0016] In some examples, the capacitor further includes a first conductive element and a second conductive element. The cover has a first nut and a second nut spaced apart from each other. The first conductive element is connected between the first electrode of the capacitor core and the first nut. The first end of the second conductive element is electrically connected to the second electrode of the capacitor core, and the second end of the second conductive element extends to the side of the baffle away from the first electrode of the capacitor core and is connected to the second nut.

[0017] The insulating component can block the connection between the second conductive component and the first electrode of the capacitor core, effectively improving the electrical insulation performance between the second conductive component and the first electrode, reducing the risk of short circuits, and ensuring the safe use of the capacitor.

[0018] In some examples, the insertion tube and the through hole are coaxially arranged, the through hole is a polygonal hole, the insertion tube is a polygonal tube adapted to the through hole, and the polygonal tube and the polygonal hole are circumferentially snapped together.

[0019] The position of the insulating component is fixed by using polygonal through holes and polygonal plug tubes for circumferential snap-fit. Without affecting the ventilation and heat dissipation path, this structure has high assembly stability and is not prone to limit failure. Moreover, it does not require additional structures for fixing the insulating component, which helps to simplify the internal structure of the capacitor and improve assembly efficiency.

[0020] In some examples, the baffle has an extension at the edge away from the connector, the extension extending axially along the capacitor core, and the extension blocking the second conductive element between the second conductive element and the outer peripheral wall of the capacitor core.

[0021] The extension section on the baffle can expand the insulation coverage of the insulating component, forming a reliable insulation barrier between the second conductive component and the outer peripheral wall of the capacitor core, effectively preventing inter-electrode creepage, further reducing the risk of short circuits, and improving the electrical safety of capacitor operation.

[0022] In some examples, the inner wall of the receiving cavity is provided with a fixing groove, and the receiving cavity is filled with potting compound, which can enter the fixing groove and cure to form a fastening structure.

[0023] The fixed groove allows the potting compound injected into the receiving cavity to fill it during the assembly process. After the assembly is completed, the potting compound solidifies, thus achieving a fixed assembly between the outer shell and the capacitor core. This ensures that the capacitor core does not easily shake within the receiving cavity of the outer shell, while eliminating the need for additional fixed connection structures. It simplifies the assembly structure and assembly operation.

[0024] In some examples, the cover includes an insertion section that is inserted into the receiving cavity, and the peripheral sidewall of the insertion section is fitted against the inner wall of the receiving cavity. The peripheral sidewall of the insertion section is provided with a fixing hole, into which potting compound can enter and cure to form a fastening structure.

[0025] The insertion section on the cover can achieve a tight connection with the outer shell by being inserted into it, or it can form a fixing form similar to the fixing groove and the potting compound by using fixing holes and potting compound, thereby further improving the reliability of the fixed connection between the cover and the outer shell. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of the capacitor provided in an embodiment of this application.

[0028] Figure 2 An exploded view of a capacitor provided in an embodiment of this application.

[0029] Figure 3 Provided for the embodiments of this application Figure 2 Another perspective.

[0030] Figure 4 This is a schematic diagram of the support base and capacitor core provided in the embodiments of this application.

[0031] Figure 5 This is a schematic diagram of the capacitor core and insulating components provided in an embodiment of this application.

[0032] Figure 6 A top view of a capacitor provided in an embodiment of this application.

[0033] Figure 7 Provided for the embodiments of this application Figure 6 Sectional view at point AA.

[0034] Figure 8 Provided for the embodiments of this application Figure 7 Enlarged view of section B in the middle.

[0035] Figure 9 This is a schematic diagram of the structure of the cover provided in an embodiment of this application.

[0036] Figure 10 Provided for the embodiments of this application Figure 9 Enlarged view of point C in the middle.

[0037] Explanation of reference numerals in the attached drawings: 1. Outer shell; 11. Receiving cavity; 111. Fixing groove; 12. Bottom wall; 13. Lead-out tube; 2. Support base; 21. Base support; 211. Enclosure; 22. Ventilation tube; 3. Capacitor core; 31. Core shaft; 311. Through hole; 4. Cover; 41. Positioning hole; 42. Mounting part; 421. Protruding edge; 422. First ear; 423. First snap-fit ​​structure; 43. Terminal block; 431. Second ear; 432. Second snap-fit ​​structure; 44. Insertion section; 441. Fixing hole; 5. Insulating component; 51. Insertion tube; 52. Baffle; 521. Extension section; 6. First conductive component; 7. Second conductive component; 8. First nut; 9. Second nut. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] During operation, the internal capacitor core of a DC-supported capacitor generates heat. Under prolonged operation, the temperature of the capacitor core continues to rise, and the capacitor core will generate internal stress due to thermal expansion. On the one hand, this will accelerate the aging of the capacitor core and affect the service life of the capacitor. On the other hand, it can easily lead to the deformation or cracking of the capacitor, affecting the safety of the capacitor's use.

[0044] Existing technologies utilize heat-conducting or auxiliary heat-dissipating structures inside or outside the capacitor casing to transfer heat from the capacitor core to the outside and dissipate it, thereby reducing the temperature of the capacitor core. However, the heat dissipation path is relatively long, and the temperature at the center of the capacitor core is difficult to dissipate in time, resulting in low heat dissipation efficiency.

[0045] Based on this, the present application provides a capacitor that can improve the heat dissipation efficiency of the capacitor and reduce the risk of the capacitor core deforming or cracking due to excessive temperature.

[0046] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0047] Reference Figures 1 to 7 This embodiment provides a capacitor, including a housing 1, a support base 2, and a capacitor core 3. The housing 1 has a receiving cavity 11, and the bottom wall 12 of the housing 1 has a lead-out tube 13 communicating with the receiving cavity 11. The support base 2 is installed in the receiving cavity 11 and includes a bottom support 21 and a ventilation tube 22 connected to each other. The bottom support 21 is located in the receiving cavity 11 on the side near the lead-out tube 13, and the ventilation tube 22 communicates with the lead-out tube 13. The capacitor core 3 includes a spindle 31, and the spindle 31 has a through hole 311 along the axial direction. The capacitor core 3 is installed on the bottom support 21, and the ventilation tube 22 passes through the through hole 311 and extends to the side of the housing 1 away from where the lead-out tube 13 is located.

[0048] By setting up interconnected lead-out pipes 13, ventilation pipes 22, and through holes 311, an independent heat dissipation channel running axially through the capacitor can be formed inside the capacitor. This heat dissipation channel is located on the central axis of the capacitor core 3, which facilitates rapid heat dissipation from the center of the capacitor core 3. This reduces the risk of deformation or cracking of the capacitor core 3 due to excessive internal temperature, thus improving the safety of the capacitor. Simultaneously, the ventilation pipes 22 on the support base 2 also serve to position the capacitor core 3, improving its assembly stability and ensuring reliable operation of the capacitor while enhancing heat dissipation efficiency.

[0049] Among them, reference Figures 1 to 3 The outer shell 1 serves as the external protection and mounting base for the capacitor. In this embodiment, the outer shell 1 is a cylindrical structure. The interior of the outer shell 1 forms a unidirectional opening cavity 11. Specifically, a circular opening is provided at one end of the cylinder, thereby forming a cylindrical cavity 11. The support base 2 and the capacitor core 3 are installed inside the cavity 11. With the cover 4 provided at the opening of the cavity 11, external dust, water vapor and other environmental factors can be isolated from interference.

[0050] The bottom wall 12 of the outer shell 1 is located on the side of the outer shell 1 away from the opening of the receiving cavity 11. The bottom wall 12 of the outer shell 1 is provided with an outlet pipe 13. The axis of the outlet pipe 13 coincides with the central axis of the cylindrical outer shell 1. The outlet pipe 13 connects the receiving cavity 11 with the external space. The heat in the receiving cavity 11 can be discharged from the receiving cavity 11 through the outlet pipe 13, which helps to reduce the accumulation of heat in the receiving cavity 11.

[0051] Reference Figures 2 to 4 The support base 2 is installed inside the receiving cavity 11. The support base 2 includes a base 21 and a ventilation pipe 22. The base 21 and the ventilation pipe 22 can be integrally formed or connected by bonding or welding, etc., to form a whole. It has high structural strength and stability and is not easily deformed due to excessive temperature. Specifically, the ventilation pipe 22 is located at the center of the base 21. One end of the ventilation pipe 22 is connected to the base 21 and the axis of the ventilation pipe 22 is perpendicular to the base 21. The end of the ventilation pipe 22 connected to the base 21 is connected to the side of the base 21 away from the side connected to the ventilation pipe 22, thereby forming a connection effect of the ventilation pipe 22.

[0052] In this embodiment, the base 21 is circular, and the diameter of the base 21 matches the inner diameter of the receiving cavity 11. The side of the base 21 facing away from the connecting ventilation pipe 22 is attached to the side of the receiving cavity 11 near the bottom wall 12. A ring of baffles 211 is also provided around the base 21, and the outer side of the baffles 211 is attached to the inner wall of the receiving cavity 11. The capacitor core 3 is installed on the base 21, and the base 21 can provide stable support and insulation for the capacitor core 3.

[0053] Meanwhile, the base 21 can also play a positioning role in the receiving cavity 11, which not only restricts the installation position of the capacitor core 3, keeps the capacitor core 3 and the outer shell 1 in a stable gap, and improves the insulation performance, but also keeps the ventilation pipe 22 and the lead pipe 13 connected, thereby forming a heat dissipation path connecting the two ends of the capacitor.

[0054] Reference Figures 3 to 7 As the core energy storage component of the capacitor, the capacitor core 3 has a spindle 31 set on the central axis of the capacitor core 3. A through hole 311 is opened on the spindle 31 along the axial direction, which helps to reduce the risk of excessive heat accumulation in the center of the capacitor core 3.

[0055] The radial dimension of the through hole 311 on the spindle 31 is larger than the radial dimension of the ventilation tube 22. The capacitor core 3 is mounted on the base 21 and the ventilation tube 22 passes through the through hole 311, so that the ventilation tube 22 and the capacitor core 3 are arranged coaxially. This not only achieves radial positioning of the capacitor core 3 to prevent the capacitor core 3 from shifting or shaking, but also allows the heat generated inside the capacitor core 3 to be quickly discharged axially through the ventilation tube 22, solving the problem of internal heat accumulation from the source and greatly improving the heat dissipation capacity and working stability of the capacitor.

[0056] Compared to the traditional approach of setting a heat-conducting structure on the capacitor core 3, this embodiment can provide reliable positioning and support for the capacitor core 3 through the capacitor shell 1 and support base 2, and can also effectively dissipate the temperature at the center of the capacitor core 3. It has the characteristics of simple structure and efficient heat dissipation.

[0057] Reference Figures 1 to 3 In some examples, the capacitor also includes a cover 4, which is located on the side of the outer casing 1 away from the lead tube 13. The cover 4 is provided with a positioning hole 41. The positioning hole 41, the through hole 311, the ventilation tube 22 and the lead tube 13 are coaxially arranged on the central axis of the capacitor core 3. The end of the ventilation tube 22 away from the base 21 is inserted into the positioning hole 41.

[0058] By setting a positioning hole 41 on the cover 4, the end of the ventilation pipe 22 away from the base 21 can be inserted into the positioning hole 41 to fix the ventilation pipe 22 in the axial and radial directions. This not only helps to improve the assembly stability of the support base 2 but also allows the ventilation pipe 22 to connect to the external environment at both ends for ventilation and heat dissipation.

[0059] The cover 4 is placed on the side of the outer shell 1 away from the outlet tube 13. The cover 4 is designed to be circular and its diameter is adapted to the diameter of the outer shell 1. The cover 4 and the cylindrical outer shell 1 cooperate to provide comprehensive protection for the components installed in the receiving cavity 11.

[0060] Specifically, refer to Figures 1 to 3The positioning hole 41 is designed as a through hole and is located at the center of the upper surface of the cover 4. The upper surface of the cover 4 is the side of the cover 4 away from the capacitor core 3. The positioning hole 41 is coaxially arranged with the ventilation pipe 22, the through hole 311 and the lead-out pipe 13, thereby forming a ventilation and heat dissipation path on the central axis of the capacitor, in which the positioning hole 41, the ventilation pipe 22 and the lead-out pipe 13 are connected in sequence. This ventilation and heat dissipation path passes through the core shaft 31 of the capacitor core 3, and the heat dissipation path is without bends or obstructions, which can greatly reduce airflow resistance so that the heat in the center of the capacitor core 3 can be quickly discharged to the outside, instead of the traditional solution where the heat is first conducted to the surface of the capacitor core 3 and then discharged. This embodiment fundamentally alleviates the problem of heat accumulation in the center of the capacitor core 3.

[0061] The ventilation pipe 22 and the positioning hole 41 can be connected by an interference fit, which achieves stable assembly while also being simple in structure and easy to assemble. In addition, in this embodiment, the farthest end of the ventilation pipe 22 away from the base 21 is flush with the upper surface of the cover 4. This ensures the stable installation of the ventilation pipe 22 in the positioning hole 41 and also avoids the ventilation pipe 22 extending too far out of the cover 4, which could cause interference or collision, thus reducing the risk of damage to the capacitor.

[0062] Reference Figure 7 and Figure 8 In some examples, an assembly gap is formed between the outer peripheral wall of the ventilation duct 22 and the wall of the through hole 311.

[0063] The ventilation duct 22 and the through hole 311 of the spindle 31 are fitted with a clearance fit, which makes it easy for the ventilation duct 22 to pass smoothly through the through hole 311 during the assembly process. This avoids damage to the ventilation duct 22, the spindle 31 or the capacitor core 3 caused by an overly tight fit between the ventilation duct 22 and the spindle 31. This helps to maintain the structural stability of each component without affecting ventilation and heat dissipation.

[0064] Specifically, refer to Figure 7 and Figure 8 The ventilation duct 22 is inserted into the through hole 311. A small gap is maintained between the outer peripheral wall of the ventilation duct 22 and the hole wall of the through hole 311. Since there is a heat dissipation airflow in the ventilation duct 22, the temperature of the ventilation duct 22 is lower than the temperature of the center of the capacitor core 3 and the core shaft 31. The heat generated by the capacitor core 3 in the working state will be transferred to the ventilation duct 22 through the core shaft 31 and the air in the gap between the core shaft 31 and the ventilation duct 22, and finally the heat dissipation airflow will be used to quickly dissipate the heat at the center of the capacitor core 3.

[0065] Furthermore, when the capacitor core 3 generates high heat, it undergoes thermal expansion and contraction. The clearance fit between the ventilation duct 22 and the through hole 311 of the spindle 31 prevents interference with the thermal expansion and contraction process of the capacitor core 3, reducing the risk of it bursting. Simultaneously, during the thermal expansion and contraction of the capacitor core 3, the spindle 31 can deform and come into contact with the ventilation duct 22, which helps accelerate heat dissipation.

[0066] Reference Figure 9 and Figure 10 In some examples, the cover 4 includes a mounting part 42 and a terminal block 43. The side wall of the mounting part 42 is provided with a protruding edge 421. The protruding edge 421 has a first ear 422 on opposite sides. The first ear 422 has a first snap-fit ​​structure 423. The terminal block 43 has a second ear 431 on opposite sides. The second ear 431 has a second snap-fit ​​structure 432. The first snap-fit ​​structure 423 and the second snap-fit ​​structure 432 are snapped together along the axial direction of the capacitor.

[0067] The mounting section 42 and the terminal block 43 are axially snapped together using a first snap-fit ​​structure 423 and a second snap-fit ​​structure 432. This allows for quick alignment and fixation of the terminal block 43 with the mounting section 42 after wiring, eliminating the complex operations of rotation or threaded fastening in traditional solutions and improving assembly efficiency. Simultaneously, the axial snap-fit ​​fixing method helps maintain the axial alignment of the positioning hole 41 with the ventilation pipe 22, facilitating assembly without interfering with the heat dissipation path.

[0068] Combination Figures 1 to 3 The mounting part 42 is used for the fixed connection between the cover 4 and the outer shell 1. The mounting part 42 is a ring structure. The outer diameter of the ring mounting part 42 matches the diameter of the cylindrical outer shell 1. The mounting part 42 and the outer shell 1 can be fixed to each other by snap-fit ​​connection or interference fit connection, thereby forming a complete external protection for the capacitor.

[0069] Reference Figure 9 and Figure 10 The protruding edge 421 is provided on the inner wall of the annular mounting part 42. The protruding edge 421 protrudes from the inner wall toward the center of the mounting part 42. In this embodiment, there are two protruding edges 421. The two protruding edges 421 are provided at opposite positions on the inner wall of the annular mounting part 42. The two protruding edges 421 form a support structure in the axial direction of the capacitor.

[0070] The terminal block 43 has a flat plate structure. The terminal block 43 is used to connect the internal circuit and external circuit of the capacitor. The length of the terminal block 43 is the same as the diameter of the annular inner wall of the mounting part 42. When the terminal block 43 is installed in the mounting part 42, the two ends of the terminal block 43 near the capacitor core 3 abut against the two protruding edges 421, thereby providing support for the terminal block 43 in the axial direction of the capacitor.

[0071] The two sides of the raised edge 421 are provided with first ears 422, which are parallel to each other and extend along the axial direction of the capacitor towards the capacitor core 3. Correspondingly, the two sides of the terminal block 43 at the position where it abuts against the raised edge 421 are provided with second ears 431 that cooperate with the first ears 422. The two second ears 431 are parallel to and abut against the two first ears 422. Specifically, the second ears 431 abut against the outer side of the first ears 422, that is, one of the first ears 422 is on the side away from the other first ear 422.

[0072] The terminal block 43 can be clamped and fixed on the flange 421 by two second ears 431. The flange 421 not only limits the terminal block 43 along the capacitor axis, but also limits the terminal block 43 radially. This ensures that the terminal block 43 can be quickly aligned and installed in place along the capacitor axis during the installation process to the mounting part 42, without having to rotate it to a fixed position and then fix it as in the traditional solution, which helps to simplify the assembly operation.

[0073] Furthermore, referring to Figure 10 The first ear portion 422 is provided with a first snap-fit ​​structure 423, and the second ear portion 431 is provided with a second snap-fit ​​structure 432. In this embodiment, the first snap-fit ​​structure 423 can be configured as a snap-fit ​​boss, and the second snap-fit ​​structure 432 can be configured as a snap-fit ​​hole. During the process of axially positioning and installing the terminal block 43 onto the protrusion 421, the second ear portion 431 and the first ear portion 422 can contact and slide relative to each other. When the second ear portion 431 contacts the snap-fit ​​boss, it only needs a little force to pass over the snap-fit ​​boss, so that the snap-fit ​​boss is snapped into the snap-fit ​​hole, thereby fixing the terminal block 43 in the axial direction of the capacitor and preventing the terminal block 43 from detaching from the mounting portion 42.

[0074] In addition, a guide slope is provided on the side of the snap-fit ​​boss that first contacts the second ear 431. The guide slope can guide the second ear 431 and prevent the second ear 431 from getting stuck on the snap-fit ​​boss side during the relative sliding process with the first ear 422. This makes it easier for the second ear 431 to move to the position where the snap-fit ​​hole engages with the snap-fit ​​boss during the assembly process.

[0075] In another embodiment, the first snap-fit ​​structure 423 can be configured as a snap-fit ​​hole, and the second snap-fit ​​structure 432 can be configured as a snap-fit ​​boss. The same technical effect as described above can still be achieved by swapping the two structures.

[0076] Optionally, the two first ears 422 can be set on the inner wall of the annular mounting portion 42, just like the protruding edge 421, and located on opposite sides of the protruding edge 421. The first snap-fit ​​structure 423 is set on the side of the first ears 422 facing the protruding edge 421 located in the middle. The structure of the terminal block 43 remains unchanged. This can form an assembly form in which the protruding edge 421 supports the terminal block 43 and the two first ears 422 clamp the terminal block 43. This has the same technical effect as the aforementioned embodiment, and will not be described again here.

[0077] Reference Figure 4 and Figure 5 In some examples, the capacitor also includes an insulating element 5, which includes an integrally formed connector 51 and a baffle 52. The connector 51 is inserted into the through hole 311, and the baffle 52 covers a portion of the first pole of the capacitor core 3.

[0078] The insulating component 5 effectively prevents short circuits between electrodes, improving the safety of the capacitor. The insulating component 5 is installed on the capacitor core 3 by inserting the connector 51 into the through hole 311. This method is simple to assemble without affecting the heat dissipation of the through hole 311 and the ventilation pipe 22.

[0079] The insulating component 5 is made of insulating material and includes an integrally formed insertion tube 51 and a baffle 52, possessing high structural strength. (Refer to...) Figure 4 and Figure 5 The insertion tube 51 is inserted into the through hole 311. The shape of the insertion tube 51 can be the same as that of the through hole 311. The radial dimension of the insertion tube 51 is larger than that of the ventilation tube 22 and smaller than that of the through hole 311. This allows the insertion tube 51 to be clamped between the ventilation tube 22 and the spindle 31, which eliminates the need for an additional fixing structure for fixing the insulating component 5. While ensuring the installation position and stability of the insulating component 5, it also avoids the installation of the insulating component 5 from interfering with the ventilation and heat dissipation path, which is conducive to improving the structural compactness of the capacitor.

[0080] The baffle 52 has a sheet-like structure, and the insertion tube 51 is located on one side of the baffle 52. The plane of the baffle 52 is perpendicular to the axis of the insertion tube 51. After the insertion tube 51 is inserted into the through hole 311, the baffle 52 is parallel to and covers the upper surface of the capacitor core 3. The upper surface of the capacitor core 3 is the first electrode of the capacitor core 3. Optionally, the coverage area of ​​the baffle 52 on the first electrode of the capacitor core 3 can be adjusted according to actual usage requirements, and it can fully cover or partially cover the first electrode area.

[0081] Reference Figures 3 to 5In some examples, the capacitor further includes a first conductive element 6 and a second conductive element 7. The cover 4 is provided with a first nut 8 and a second nut 9 spaced apart from each other. The first conductive element 6 is connected between the first pole of the capacitor core 3 and the first nut 8. The first end of the second conductive element 7 is electrically connected to the second pole of the capacitor core 3, and the second end of the second conductive element 7 extends to the side of the baffle 52 away from the first pole of the capacitor core 3 and is connected to the second nut 9.

[0082] The insulating component 5 can block the second conductive component 7 from the first pole of the capacitor core 3, effectively improving the electrical insulation performance between the second conductive component 7 and the first pole, reducing the risk of short circuit, and ensuring the safe use of the capacitor.

[0083] Specifically, refer to Figures 3 to 5 The first conductive element 6 is used to electrically connect the first pole of the capacitor core 3 to the first nut 8 on the terminal block 43, and the second conductive element 7 is used to electrically connect the second pole of the capacitor core 3 to the second nut 9 on the terminal block 43. Specifically, the first end of the first conductive element 6 is electrically connected to the position of the first pole of the capacitor core 3 that is not covered by the insulating element 5, and the second end of the first conductive element 6 is directly electrically connected to the first nut 8.

[0084] The first end of the second conductive element 7 extends to the side of the capacitor core 3 near the bottom wall 12 of the outer casing 1 and is electrically connected to the second pole of the capacitor core 3 located on that side. The second end of the second conductive element 7 extends to the side of the capacitor core 3 near the cover 4 and is located on the side of the insulating element 5 away from the first pole of the capacitor core 3. Thus, the baffle 52 of the insulating element 5 effectively isolates the first pole from the second conductive element 7 and prevents a short circuit between the second conductive element 7 and the first pole.

[0085] Reference Figure 5 In some examples, the insertion tube 51 is coaxially arranged with the through hole 311, the through hole 311 is a polygonal hole, the insertion tube 51 is a polygonal tube adapted to the through hole 311, and the polygonal tube is circumferentially snapped into the polygonal hole.

[0086] The position of the insulating component 5 is fixed by using a polygonal through hole 311 and a polygonal plug tube 51 for circumferential snap-fit. Without affecting the ventilation and heat dissipation path, the assembly stability of this structure is high and it is not easy to fail due to limit failure. Moreover, there is no need to set up an additional structure for fixing the insulating component 5, which helps to simplify the internal structure of the capacitor and improve assembly efficiency.

[0087] In this embodiment, the through hole 311 is a hexagonal hole, and the insertion tube 51 is correspondingly set as a hexagonal tube. The hexagonal tube is aligned and inserted into the hexagonal hole. The corners of the hexagon can achieve stable positioning and prevent the insertion tube 51 from rotating in the through hole 311, thereby locking the position of the baffle 52 on the first pole and ensuring that the capacitor maintains reliable insulation performance for a long time.

[0088] In an alternative embodiment, the through hole 311 and the insertion tube 51 can also be configured as three-sided, four-sided, or five-sided, etc., all of which can achieve the same technical effect as described above.

[0089] Reference Figure 5 In some examples, the baffle 52 has an extension 521 at the edge away from the connector 51. The extension 521 extends along the axial direction of the capacitor core 3 and blocks the second conductive member 7 between the outer peripheral wall of the capacitor core 3.

[0090] The extension section 521 provided on the baffle 52 can expand the insulation coverage of the insulating member 5, forming a reliable insulation barrier between the second conductive member 7 and the outer peripheral wall of the capacitor core 3, effectively preventing inter-electrode creepage, further reducing the risk of short circuit, and improving the electrical safety of capacitor operation.

[0091] Reference Figure 5 In this embodiment, the baffle 52 is fan-shaped to fit the cylindrical capacitor core 3. The center of the fan-shaped baffle 52 is located on the axis of the connector 51, and the radius of the fan-shaped baffle 52 is slightly larger than the radius of the capacitor core 3, so that the side of the baffle 52 away from the connector 51 can extend to the outside of the capacitor core 3. The extension section 521 is provided at the edge of the fan-shaped baffle 52 away from the connector 51 and extends along the axial direction of the capacitor core 3, forming a wrap around the corners of the capacitor core 3 and covering part of the peripheral sidewall of the capacitor core 3, effectively increasing the insulation protection area of ​​the insulating component 5.

[0092] The second conductive element 7 extends from the second pole of the capacitor core 3 through the peripheral wall of the capacitor core 3 to the first pole. The extension section 521 on the baffle 52 can block the second conductive element 7 from the peripheral wall of the capacitor core 3. Together with the baffle 52, the electrical isolation effect between the two poles inside the capacitor is further enhanced, reducing the risk of short circuit or electrical accident inside the capacitor.

[0093] Furthermore, the extension 521 based on the baffle 52 does not need to be too long, only less than one-third of the axial length of the capacitor core 3. This reduces the risk of creepage between the second conductive element 7 and the first electrode of the capacitor core 3, while also reducing space occupation and material usage.

[0094] Reference Figure 3 and Figure 7 In some examples, the inner wall of the receiving cavity 11 is provided with a fixing groove 111, and the receiving cavity 11 is filled with potting compound, which can enter the fixing groove 111 and cure to form a fastening structure.

[0095] The fixed groove 111 allows the potting compound injected into the receiving cavity 11 to fill it during the assembly process. After the assembly is completed, the potting compound solidifies, thus achieving a fixed assembly between the outer shell 1 and the capacitor core 3. This ensures that the capacitor core 3 does not easily shake within the receiving cavity 11 of the outer shell 1, and eliminates the need for additional fixed connection structures, thus simplifying the assembly structure and assembly operation.

[0096] In this embodiment, the fixing groove 111 is formed on the inner wall of the receiving cavity 11. The fixing groove 111 is spiral in shape, and the central axis of the spiral fixing groove 111 coincides with the central axis of the cylindrical outer shell 1. The spiral fixing groove 111 can significantly increase the contact area of ​​the potting compound on the inner wall of the receiving cavity 11, significantly improve the fixing effect of the potting compound on the outer shell 1 after solidification, and help maintain the stability of the capacitor structure.

[0097] In one alternative embodiment, multiple fixing grooves 111 can be provided, and the multiple fixing grooves 111 can be spaced apart on the inner wall of the receiving cavity 11. The shape of the fixing grooves 111 can be set in various forms, as long as the potting compound can enter and, after solidification, can play the role of fixing the capacitor core 3 and the outer shell 1.

[0098] Reference Figure 3 and Figure 7 In some examples, the cover 4 includes an insertion section 44 that is inserted into the receiving cavity 11, and the peripheral sidewall of the insertion section 44 is in contact with the inner wall of the receiving cavity 11. The peripheral sidewall of the insertion section 44 is provided with a fixing hole 441, and the potting compound can enter the fixing hole 441 and cure to form a fastening structure.

[0099] The insertion section 44 on the cover 4 can achieve a tight connection with the outer shell 1 by inserting it into the outer shell 1, and can also form a fixing form similar to the fixing groove 111 and the potting compound by using the fixing hole 441 and potting compound, thereby further improving the reliability of the fixed connection between the cover 4 and the outer shell 1.

[0100] The insertion section 44 of the cover 4 is annular, and the outer diameter of the insertion section 44 is slightly smaller than the inner diameter of the cavity 11 of the outer shell 1. The insertion section 44 can be inserted into the cavity 11 to form an interference fit with the inner wall of the cavity 11, so that reliable installation can be achieved without setting other fixed connection structures.

[0101] Furthermore, a fixing hole 441 is provided on the insertion section 44, and the potting compound can also enter the fixing hole 441. After solidification, it serves to fix the insertion section 44. Similar to the cooperation between the fixing groove 111 on the inner wall of the receiving cavity 11 and the potting compound, it not only eliminates the need for a fixed connection structure, but also ensures reliable installation.

[0102] In addition, multiple fixing holes 441 can be provided. In this embodiment, four fixing holes 441 are provided. The four fixing holes 441 are symmetrically arranged to cooperate with the potting compound to form a uniform force fixation in all directions, reducing the risk of the cover 4 detaching from the outer shell 1.

[0103] Of course, a spiral groove can also be provided on the insertion section 44, which can achieve the same technical effect as the fixing groove 111 in the receiving cavity 11, and will not be described in detail here.

[0104] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A capacitor, characterized in that, include: The outer shell has a receiving cavity, and the bottom wall of the outer shell has an outlet pipe communicating with the receiving cavity; A support base is installed inside the receiving cavity. The support base includes a base and a ventilation pipe connected to each other. The base is located inside the receiving cavity on the side close to the outlet pipe, and the ventilation pipe is connected to the outlet pipe. A capacitor core includes a spindle with a through hole along the axial direction. The capacitor core is mounted on the base. A ventilation tube passes through the through hole and extends to the outer casing on the side away from where the lead-out tube is located.

2. The capacitor according to claim 1, characterized in that, It also includes a cover, which is located on the side of the outer shell away from the lead-out tube. The cover has a positioning hole. The positioning hole, the through hole, the ventilation tube, and the lead-out tube are coaxially arranged on the central axis of the capacitor core. The end of the ventilation tube away from the base is inserted into the positioning hole.

3. The capacitor according to claim 2, characterized in that, An assembly gap is formed between the outer peripheral wall of the ventilation duct and the wall of the through hole.

4. The capacitor according to claim 2, characterized in that, The cover includes a mounting part and a wiring plate. The side wall of the mounting part is provided with a protruding edge. The two opposite sides of the protruding edge are provided with first ears. The first ears are provided with a first snap-fit ​​structure. The two opposite sides of the wiring plate are provided with second ears. The second ears are provided with a second snap-fit ​​structure. The first snap-fit ​​structure and the second snap-fit ​​structure are snapped together along the axial direction of the capacitor.

5. The capacitor according to any one of claims 2-4, characterized in that, The capacitor also includes an insulating component, which includes an integrally formed connector and a baffle. The connector is inserted into the through hole, and the baffle covers a portion of the first electrode of the capacitor core.

6. The capacitor according to claim 5, characterized in that, The insertion tube is coaxially arranged with the through hole, the through hole is a polygonal hole, the insertion tube is a polygonal tube adapted to the through hole, and the polygonal tube is circumferentially engaged with the polygonal hole.

7. The capacitor according to claim 5, characterized in that, The capacitor further includes a first conductive element and a second conductive element, and the cover is provided with a first nut and a second nut spaced apart from each other. The first conductive element is connected between the first pole of the capacitor core and the first nut. The first end of the second conductive element is electrically connected to the second pole of the capacitor core, and the second end of the second conductive element extends to the side of the baffle away from the first pole of the capacitor core and is connected to the second nut.

8. The capacitor according to claim 7, characterized in that, The baffle has an extension section at the edge away from the connector, the extension section extends along the axial direction of the capacitor core, and the extension section blocks the space between the second conductive element and the outer peripheral wall of the capacitor core.

9. The capacitor according to any one of claims 2-4, characterized in that, The inner wall of the receiving cavity is provided with a fixing groove, and the receiving cavity is filled with potting compound. The potting compound can enter the fixing groove and cure to form a fastening structure.

10. The capacitor according to claim 9, characterized in that, The cover includes an insertion section that is inserted into the receiving cavity, and the peripheral sidewall of the insertion section is in contact with the inner wall of the receiving cavity. The peripheral sidewall of the insertion section is provided with a fixing hole, and the potting compound can enter the fixing hole and cure to form a fastening structure.

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