Capacitor with protection function

Abstract

The utility model discloses a capacitor with a protection function, which comprises a metal shell and a capacitor inner core, the capacitor inner core is arranged in the metal shell, a pair of positive and negative electrode guide pins is symmetrically arranged on the upper surface of the capacitor inner core, the metal shell is of a cylindrical structure with an opening at the top, and a support cylinder is sleeved in the metal shell. Stamping the side surface of the supporting cylinder at equal intervals, bending leftover materials generated during stamping into the supporting cylinder to form elastic sheets, abutting the end parts of the elastic sheets against the side surface of the capacitor inner core, and forming heat dissipation holes in the side surface of the supporting cylinder in the bending process of the elastic sheets. The protective shell is made of a metal material, heat generated by the capacitor is dissipated by using high thermal conductivity of metal, and meanwhile, a plurality of heat dissipation holes are formed in the supporting cylinder used for stabilizing installation of the inner core of the capacitor, so that the heat can directly penetrate through the heat dissipation holes to be transmitted to the metal shell, the heat dissipation efficiency is further enhanced, and the service life of the capacitor is prolonged. And the elastic sheet is arranged in the supporting cylinder, so that the capacitor inner cores with different diameters can be placed in the supporting cylinder to be fixed.

Description

Technical Field

[0001] The utility model belongs to the field of electromagnetic induction, and specifically relates to a capacitor with a protection function. Background Art

[0002] Two conductors close to each other with a layer of non-conductive insulating medium in between form a capacitor. The existing capacitors have a single protection method during use. Usually, after covering the surface of the capacitor inner core with a metal shell, simple protection is carried out. In this way, the heat dissipation effect is poor, and at the same time, its protection ability is poor, and it is easy to leak capacitor liquid.

[0003] Chinese Patent CN114783779A discloses an aluminum electrolytic capacitor with a protection function. By setting a shell for placing the aluminum electrolytic capacitor inside the shell to protect and guard it as a whole. Through the cooperation of an insulating card board and an insulating card seat, the opening of the shell can be sealed and supported. After injecting insulating resin, the overall stability is improved, and the protection effect is enhanced. The structure inside the shell has the advantage of being easy to assemble during assembly. By setting a ring body located inside the shell to support the inner wall of the shell, the compressive resistance of the shell is improved, making the shell not easily deformed, and improving the protection effect on the capacitor inner core. By setting an insulating card seat to seal the top of the shell, the sealing performance of the capacitor is improved. At the same time, through the characteristics of PEEK resin, the purposes of acid and alkali resistance, high temperature resistance, insulation, and good waterproof performance can be achieved, improving the safety of the capacitor during use.

[0004] The improvements in the protection of capacitors in the prior art are too complex. The volume of capacitors is small, and for the protection of capacitors, in order to fit the capacitors, their volume will not be too large. Too complex a structure is likely to make manufacturing difficult and assembly inconvenient. Summary of the Invention

[0005] The purpose of this part is to outline some aspects of the embodiments of the present utility model and briefly introduce some preferred embodiments. Simplifications or omissions may be made in this part, as well as in the abstract of the specification and the name of the utility model of this application, to avoid obscuring the purpose of this part, the abstract of the specification, and the name of the utility model. However, such simplifications or omissions cannot be used to limit the scope of the present utility model.

[0006] To solve the above problems, the present utility model adopts the following technical solutions.

[0007] A capacitor with a protective function comprises a metal shell and a capacitor core, wherein the capacitor core is placed in the metal shell, a pair of positive and negative electrode guide pins are symmetrically arranged on the upper surface of the capacitor core, the metal shell is a cylindrical structure with an open top, a support tube is sleeved in the metal shell, the side surfaces of the support tube are punched at equal intervals, and the scraps produced during the punching are bent into the support tube to form spring pieces, the ends of the spring pieces abut against the side surfaces of the capacitor core, and heat dissipation holes are formed on the side surfaces of the support tube during the bending process of the spring pieces; when the capacitor core is placed in the support tube, the side surfaces abut against the spring pieces, and the rebound force of the spring pieces acts on the side surfaces of the capacitor core to form a clamping force, thereby ensuring the stability of the capacitor core in the metal shell.

[0008] Connecting holes are symmetrically opened on the side of the metal shell, and the connecting holes are composed of two through holes with different diameters inside and outside. The through hole with smaller diameter is opened outward from the inner wall of the metal shell, and a thread is engraved on the inner wall of the through hole with smaller diameter, and the hole with larger diameter is opened inward from the outer wall of the metal shell and connected with the hole with smaller diameter. A stud is inserted in the connecting hole, and the stud is threadedly connected to the connecting hole, and the end of the stud abuts against the side of the supporting tube, and a fitting sheet is sleeved on the front end of the stud, and the fitting sheet is fixed to the outer wall of the metal shell by screws to seal the connecting hole.

[0009] A filling hole is opened upward along the top of the through hole with a larger diameter in the connecting hole, and a blind hole is opened on the outer wall of the metal shell. The end of the blind hole is connected to the top of the filling hole. Thermal conductive silicone grease is injected into the blind hole to fill and seal the filling hole and the connecting hole.

[0010] A first embedding groove is provided on the upper surface of the metal shell, a second embedding groove is provided in the first embedding groove, a supporting sheet is covered on the second embedding groove, a sealing sheet is covered on the first embedding groove, and circular holes for exposing the positive and negative electrode guide pins are provided on the sealing sheet and the supporting sheet.

[0011] The thickness of the support sheet is smaller than the depth of the second embedding groove. When the support sheet covers the second embedding groove and the sealing sheet covers the first embedding groove, a sandwich is formed between the support sheet and the sealing sheet, and insulating resin is injected into the sandwich.

[0012] A plurality of screw holes are equidistantly arranged in a surrounding manner on the first embedding groove and the upper surface of the sealing sheet, screws are threadedly connected in the screw holes, and the sealing sheet is fixed to the first embedding groove by screws to form a whole with the metal shell.

[0013] Compared with the prior art, the utility model has the following beneficial effects.

[0014] The present application firstly uses metal material for the protective shell of the capacitor, and utilizes the high thermal conductivity of metal to dissipate the heat generated by the capacitor well. At the same time, a plurality of heat dissipation holes are provided on the support tube for stabilizing the installation of the inner core of the capacitor, so that the heat generated by the inner core of the capacitor can be directly transferred to the metal shell through the heat dissipation holes, thereby further enhancing the heat dissipation efficiency.

[0015] Furthermore, the support tube in the present application is provided with spring sheets inside, so that capacitor cores of different diameters can be placed in the support tube. The resistance and protection of the spring sheets form a relatively stable connection between the capacitor core and the support tube, which protects the capacitor core to a certain extent and prevents the capacitor core from being damaged due to shaking in the outer shell. The support tube and the metal outer shell are directly fixed by resistance through studs, so that the support tube is fixed in the metal outer shell, further enhancing the installation stability of the capacitor core.

[0016] In order to install the stud, a connecting hole connected to the inside is provided on the metal shell. In order to ensure the sealing, the present application provides a blind hole on the side wall of the metal shell, and at the same time, a filling hole is provided on the upper surface of the connecting hole. The filling hole is connected with the blind hole to form a right-angle hole. Thermal conductive silicone grease is injected into the right-angle hole to close the gap between the connecting hole and the stud to ensure its sealing. To a certain extent, the capacitor liquid inside the capacitor is prevented from leaking through the holes opened in the metal shell, and the factors affecting the capacitor, such as dust and moisture from the outside, can be prevented from entering the metal shell through the holes on the metal shell to affect the life of the capacitor.

[0017] Furthermore, the heat of the capacitor core is directly transferred to the support tube, and the support tube transfers the heat directly to the stud. Since the stud passes through the metal shell, its end is connected to the outside world, thus forming the function of a heat sink to a certain extent, and can also dissipate the heat generated by the capacitor to further protect the capacitor.

[0018] In order to facilitate the installation of the inner core of the capacitor, the metal shell in the present application is a cylindrical structure. Therefore, in order to ensure its sealing, a support plate and a sealing plate are arranged on the upper surface of the metal shell. The support plate and the sealing plate are connected by opening an interlocking groove on the upper surface of the metal shell. The design of the interlocking groove can play a positioning role to a certain extent. There is a certain interlayer cavity between the support plate and the sealing plate. Insulating resin can be injected into the interlayer cavity to ensure its sealing. The insulating resin is used to fill the gap between the support plate and the metal shell, and the insulating resin is protected by the sealing plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a three-dimensional structure diagram of a capacitor.

[0020] Figure 2 This is a partial cross-sectional structural diagram of the capacitor.

[0021] Figure 3 for Figure 2 A partial enlarged view of the sealing and fixing structure at point A in the middle.

[0022] Figure 4 This is a schematic diagram of the capacitor's disassembled structure.

[0023] Figure 5 It is a disassembled structure diagram of the capacitor inner core and the support cylinder.

[0024] Figure 6 It is a sectional view structure diagram of the support cylinder.

[0025] The corresponding relationship between the labels of each attached figure in the figure and the component names is as follows: 100, metal shell; 100a, blind hole; 100b, filling hole; 100c, connection hole; 100c-1, stud; 100c-2, fitting piece; 100d, first fitting groove; 100e, second fitting groove; 101, sealing piece; 102, support piece; 200, support cylinder; 201, heat dissipation hole; 201a, elastic piece; 300, capacitor inner core; 301, positive and negative lead pins. Detailed implementation manners

[0026] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the following will make a detailed description of the specific implementation manners of the present utility model with reference to the accompanying drawings of the specification.

[0027] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Those skilled in the art can make similar promotions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0028] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present utility model. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that excludes other embodiments. The present utility model provides the following embodiments.

[0029] Refer to Figure 1 and Figure 2The overall structure diagram of the capacitor with protection function of this embodiment includes a metal shell 100 and a capacitor core 300. The metal shell 100 is a cylindrical structure with an open top for facilitating the installation of the capacitor core 300. A support cylinder 200 is sleeved in the metal shell 100. The capacitor core 300 is inserted into the support cylinder 200 and then placed in the metal shell 100. The metal shell 100 is mass-produced, but the diameters of the capacitor cores 300 are different. Therefore, in order to enable the metal shell 100 to be assembled with the capacitor cores 300 of different diameters, this embodiment The support tube 200 is used as a filling structure to stabilize the installation of the support tube 200 in the metal shell 100, and the support tube 200 can also play a buffering and protective role for the capacitor core 300. Further, the metal shell 100 is used to protect the capacitor core 300, and the heat dissipated by the capacitor core 300 can be dissipated through the high thermal conductivity of the metal shell 100. A pair of positive and negative guide pins 301 are symmetrically provided on the upper surface of the capacitor core 300. The positive and negative guide pins 301 are two groups of pins of the capacitor core 300, which are used to connect to the circuit.

[0030] See also Figure 5 and Figure 6 This is a schematic diagram of the capacitor protection structure in this embodiment. In order to further ensure the protective effect of the support tube 200 on the capacitor core 300, and to ensure that the capacitor core 300 can form a relatively stable installation state with the metal shell 100 through the support tube 200, and to ensure that the capacitor cores 300 of different diameters will not shake in the metal shell 100, this embodiment equidistantly punches the side of the support tube 200, and the scraps generated during the punching are bent into the support tube 200 to form a spring piece 201a, and the end of the spring piece 201a abuts against On the side of the capacitor core 300, a heat dissipation hole 201 is formed on the side of the support tube 200 during the bending process of the spring piece 201a. When the capacitor core 300 is placed in the support tube 200, the side surface contacts the spring piece 201a. The rebound force of the spring piece 201a acts on the side of the capacitor core 300 to form a clamping force, thereby ensuring the stability of the capacitor core 300 in the metal shell 100. At the same time, the heat generated by the capacitor core 300 during operation will be dissipated outward through the heat dissipation hole 201, and the heat will be quickly dissipated when it contacts the metal shell 100.

[0031] See also Figure 4 and Figure 5This is the capacitance limit structure diagram in this embodiment. A support piece 102 is provided on the upper surface of the support cylinder 200 to seal the upper surface of the support cylinder 200. The lower surface of the support piece 102 is attached to the upper surface of the capacitance inner core 300, so that there is no space left in the support cylinder 200 to allow the capacitance inner core 300 to move up and down. Further, in order to ensure the sealing performance and fix the support piece 102 on the upper surface of the support cylinder 200, in this embodiment, a first fitting groove 100d is opened on the upper surface of the metal shell 100, and a second fitting groove 100e is opened in the first fitting groove 100d. The support piece 102 is placed in the second fitting groove 100e, and a sealing piece 101 is covered on the first fitting groove 100d. Circular holes for the positive and negative lead pins 301 to expose are opened on the sealing piece 101 and the support piece 102. The thickness of the support piece 102 is less than the depth of the second fitting groove 100e. When the support piece 102 covers the second fitting groove 100e and the sealing piece 101 covers the first fitting groove 100d, a sandwich layer is formed between the support piece 102 and the sealing piece 101. Insulating resin can be injected into the cavity of this sandwich layer to ensure its sealing performance, and the gap between the support piece 102 and the metal shell 100 is filled with the insulating resin, and the insulating resin is protected by the sealing piece 101. Further, a plurality of screw holes are provided at equal intervals in a circumferential manner on the upper surfaces of the first fitting groove 100d and the sealing piece 101, and screws are threadedly connected in the screw holes. The sealing piece 101 is fixed on the first fitting groove 100d by screws to form an integral body with the metal shell 100.

[0032] Refer to Figure 3 This is the schematic diagram of the fixing and sealing structure of the support cylinder in this embodiment. Considering that a gap will be formed when the support cylinder 200 is assembled in the metal shell 100, and the support cylinder 200 may shake or rotate due to the gap, so in this embodiment, a fixing component needs to be set to limit and fix the support cylinder 200. Specifically: connection holes 100c are symmetrically opened on the side surface of the metal shell 100, a stud 100c-1 is inserted into the connection holes 100c, the stud 100c-1 is fixedly connected with the connection holes 100c, and the end of the stud 100c-1 abuts against the side surface of the support cylinder 200. The support cylinder 200 and the metal shell 100 are directly fixed by abutting through the stud 100c-1, so that the support cylinder 200 is fixed in the metal shell 100, further strengthening the installation stability of the capacitance inner core 300. At the same time, in order to cover the connection holes 100c, a fitting piece 100c-2 is sleeved on the front end of the stud 100c-1, and the fitting piece 100c-2 is fixed to the outer wall of the metal shell 100 by screws to block the connection holes 100c.

[0033] It should be noted that to a certain extent, the stud 100c-1 can also support the support cylinder 200 to prevent the support cylinder 200 from being indented inward due to external force extrusion.

[0034] Furthermore, considering that opening the connection hole 100c will affect the sealing performance of the metal housing 100, another solution needs to be set for the connection hole 100c to fill and seal it. The specific method in this embodiment is as follows: The connection hole 100c is composed of two through holes with different diameters inside and outside. The through hole with a smaller diameter is opened from the inner wall of the metal housing 100 outwards, and threads are engraved on the inner wall of the through hole with a smaller diameter. The hole with a larger diameter is opened from the outer wall of the metal housing 100 inwards and communicated with the hole with a smaller diameter. The through hole with a smaller diameter provided with threads forms a threaded hole, and the threaded hole is threadedly connected with the stud 100c-1. Further, a filling hole 100b is opened upwards along the top of the through hole with a larger diameter in the connection hole 100c, and a blind hole 100a is opened on the outer wall of the metal housing 100. The end of the blind hole 100a is communicated with the top end of the filling hole 100b. Thermal grease is injected into the blind hole 100a to fill and seal the filling hole 100b and the connection hole 100c. Since the aperture at the front end of the connection hole 100c is larger, the thermal grease will well fill the connection hole 100c to seal the connection hole 100c. The function of setting a larger aperture is to effectively prevent the thermal grease from being injected incompletely and leaving dead corners.

[0035] It should be noted that the heat of the capacitor inner core 300 is directly transferred to the support cylinder 200, and the support cylinder 200 directly transfers the heat to the stud 100c-1. Since the stud 100c-1 penetrates the metal housing 100, its end is communicated with the outside, thus forming the function of a heat sink to a certain extent and being able to dissipate the heat generated by the capacitor to further protect the capacitor. The thermal grease can strengthen the heat transfer while playing the role of sealing to further improve the heat dissipation performance.

[0036] The above content further elaborates on the present utility model in combination with specific embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope determined by the claims submitted for the present utility model.

Claims

1. A capacitor with a protective function, comprising a metal shell (100) and a capacitor core (300), wherein the capacitor core (300) is placed in the metal shell (100), and a pair of positive and negative electrode guide pins (301) are symmetrically arranged on the upper surface of the capacitor core (300), characterized in that: The metal shell (100) is a cylindrical structure with an open top. A support tube (200) is sleeved inside the metal shell (100). The side of the support tube (200) is punched at equal intervals. The scraps generated during the punching are bent into the support tube (200) to form a spring sheet (201a). The end of the spring sheet (201a) abuts against the side of the capacitor core (300). During the bending process of the spring sheet (201a), a heat dissipation hole (201) is formed on the side of the support tube (200). When the capacitor core (300) is placed in the support tube (200), the side abuts against the spring sheet (201a). The rebound force of the spring sheet (201a) acts on the side of the capacitor core (300) to form a clamping force, thereby ensuring the stability of the capacitor core (300) in the metal shell (100).

2. The capacitor with protection function according to claim 1, characterized in that: A connection hole (100c) is symmetrically provided on the side of the metal shell (100), and the connection hole (100c) is composed of two inner and outer through holes of different diameters, wherein the through hole with a smaller diameter is opened outward from the inner wall of the metal shell (100), and a thread is engraved on the inner wall of the through hole with a smaller diameter, and the hole with a larger diameter is opened inward from the outer wall of the metal shell (100) and is connected to the hole with a smaller diameter, a stud (100c-1) is inserted into the connection hole (100c), the stud (100c-1) is threadedly connected to the connection hole (100c), and the end of the stud (100c-1) abuts against the side of the support tube (200), and a bonding sheet (100c-2) is sleeved on the front end of the stud (100c-1), and the bonding sheet (100c-2) is fixed to the outer wall of the metal shell (100) by screws to seal the connection hole (100c).

3. The capacitor with protection function according to claim 2, characterized in that: A filling hole (100b) is opened upward along the top of the through hole with a larger diameter in the connecting hole (100c), a blind hole (100a) is opened on the outer wall of the metal shell (100), the end of the blind hole (100a) is connected to the top of the filling hole (100b), and thermal conductive silicone grease is injected into the blind hole (100a) to fill and seal the filling hole (100b) and the connecting hole (100c).

4. The capacitor with protection function according to claim 1, characterized in that: A first fitting groove (100d) is provided on the upper surface of the metal housing (100), a second fitting groove (100e) is provided in the first fitting groove (100d), a support sheet (102) is covered on the second fitting groove (100e), a sealing sheet (101) is covered on the first fitting groove (100d), and circular holes for exposing the positive and negative electrode guide pins (301) are provided on the sealing sheet (101) and the support sheet (102).

5. The capacitor with protection function according to claim 4, characterized in that: The thickness of the support sheet (102) is less than the depth of the second engaging groove (100e), and when the support sheet (102) covers the second engaging groove (100e) and the sealing sheet (101) covers the first engaging groove (100d), a sandwich is formed between the support sheet (102) and the sealing sheet (101), and insulating resin is injected into the sandwich.

6. The capacitor with protection function according to claim 4, characterized in that: A plurality of screw holes are equidistantly arranged in a surrounding manner on the first fitting groove (100d) and the upper surface of the sealing sheet (101), screws are threadedly connected in the screw holes, and the sealing sheet (101) is fixed to the first fitting groove (100d) by means of screws to form a whole with the metal housing (100).

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