High-voltage pulse capacitor

Abstract

The utility model discloses a high-voltage pulse capacitor, which comprises a shell, a capacitor inner core assembled in the shell, a pair of guide pins arranged on the upper surface of the capacitor inner core, an installation groove arranged on the upper surface of the shell, an end cover arranged on the upper surface of the installation groove, and a capacitor inner core arranged on the upper surface of the end cover, through holes for exposing the guide pins are symmetrically formed in the end cover, a filling sleeve is integrally connected with the upper surface of the end cover around the through holes, a sealing piece covers the upper surface of the filling sleeve, and the sealing piece is connected with the filling sleeve through a screw. The heat-conducting silicone grease is used for sealing the end gap, the stability of the heat-conducting silicone grease is better than that of epoxy resin, the sealing performance can be guaranteed to a certain degree, the lantern ring is embedded in the heat-conducting silicone grease, the lantern ring is externally connected with the cooling fins, and the lantern ring is embedded in the heat-conducting silicone grease; the heat generated by the heat-conducting silicone grease can be dissipated to the outside of the filling sleeve through the radiating fins, so that the heat-conducting silicone grease is ensured to be in a relatively balanced temperature.

Description

Technical Field

[0001] The utility model belongs to the field of electromagnetic induction, and particularly relates to a high-voltage pulse capacitor. Background Art

[0002] A pulse capacitor can store the charging energy of a small-power power supply in a capacitor over a long time interval, and release the stored energy instantaneously within a very short time interval to form a powerful impact current and a powerful impact power. Existing high-voltage pulse capacitors have oil leakage at the electrodes and poor sealing of the outer shell, resulting in a limited product qualification rate; if epoxy resin is used instead of insulating oil to encapsulate the capacitor core group, although there is no oil leakage phenomenon, due to the high viscosity and poor wettability of epoxy resin, the epoxy resin cannot fill the tiny gaps in the capacitor core group. Compared with capacitors using insulating oil, the voltage withstand and breakdown resistance of capacitors encapsulated with epoxy resin are significantly reduced.

[0003] A high-voltage pulse capacitor disclosed in Chinese Patent CN106298241B includes an outer shell, a capacitor core group and electrodes. Inside the outer shell, a lower epoxy resin layer, an insulating layer that completely covers the capacitor core group, a fixing sleeve and an upper epoxy resin layer are sequentially arranged from bottom to top. The insulating layer is made of insulating heat-conducting oil, and the insulating heat-conducting oil is composed of castor oil, silicone oil, silicon nitride powder and silane coupling agent. By adding silicone oil, silicon nitride powder and silane coupling agent into a high-shear emulsifying machine according to the proportion, on the premise of ensuring the voltage withstand and breakdown resistance of the capacitor, the sealing performance of the outer shell is significantly improved, the sealing cost is low, and the safety is good. The high-voltage pulse capacitor has good heat dissipation performance, can timely dissipate the heat generated by the capacitor core group to the outside through the insulating layer, avoid the influence of high temperature on the sealing performance of the seal, and has good implementation effect and high application value.

[0004] Existing pulse capacitors mostly use epoxy resin for encapsulation for their sealing performance. However, for capacitors sealed with epoxy resin, the sealing performance of the seal will deteriorate at high temperatures, affecting the use of the capacitor. Summary of the Invention

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

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

[0007] A high-voltage pulse capacitor includes a housing, in which a capacitor inner core is assembled. A pair of guide pins are provided on the upper surface of the capacitor inner core. One guide pin serves as an anode contact, and the other guide pin serves as a cathode contact. An installation groove is formed on the upper surface of the housing, and an end cover is provided on the upper surface of the installation groove. Through holes for the guide pins to expose are symmetrically formed on the end cover. A filling sleeve is integrally connected to the upper surface of the end cover around the through holes. A sealing sheet covers the upper surface of the filling sleeve, and the sealing sheet is connected to the filling sleeve by screws; when the capacitor inner core is placed inside the housing, the end cover is hermetically connected to the installation groove, and the guide pins extend outside the filling sleeve through the through holes. Thermal conductive silicone grease is injected into the filling sleeve to seal the connection gap between the guide pins and the filling sleeve, and the sealing sheet covers the thermal conductive silicone grease to play a protective role.

[0008] A collar is arranged in the filling sleeve, and the inner diameter of the collar is larger than the diameter of the guide pin. The collar is sleeved on the guide pin, and the collar is concentric with the guide pin. A plurality of heat dissipation fins are equidistantly connected to the side surface of the collar.

[0009] A plurality of connection holes are formed in a circumferential and equidistant manner on the side surface of the filling sleeve. The number of the formed connection holes is the same as the number of the heat dissipation fins, and the heat dissipation fins extend outside the filling sleeve through the connection holes.

[0010] Fixing pieces are integrally connected to the inner wall of the housing in a circumferential and equidistant manner, and the number of the fixing pieces is an even number. The ends of the fixing pieces are cut into inclined surface structures, and the capacitor inner core is placed between the fixing pieces.

[0011] A plurality of fitting grooves are equidistantly formed in the fixing pieces, and ceramic rings are clamped in the fixing pieces by the fitting grooves. The inner diameter of the ceramic rings is equal to the outer diameter of the capacitor inner core, and when the capacitor inner core is placed inside the housing, it is closely attached to the ceramic rings.

[0012] The ceramic rings are of arc-shaped structures, and the ceramic rings are symmetrically installed in the fitting grooves at the same height, and the pair of symmetrically installed ceramic rings do not contact each other.

[0013] The ceramic rings protrude from the fixing pieces. When the capacitor inner core is sleeved with the ceramic rings, a cavity is formed between the capacitor inner core and the fixing pieces.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows: (1) In this application, the capacitor inner core is placed inside the housing, and the end cover is welded to the upper surface of the housing for sealing. Since the housing and the end cover are welded, the sealing performance can be guaranteed, and the oil injected inside the housing can be prevented from leaking out.

[0015] (2) At the same time, since there are electrodes on the inner core of the capacitor, in order to facilitate the extension of the electrodes, holes are provided on the end cover in this application. The guide pins of the electrodes extend out from the holes. Therefore, this hole is an area prone to oil leakage. Thus, in this application, a filling sleeve is welded on this hole, and the guide pins extend out from the filling sleeve. Meanwhile, thermal conductive silicone grease is injected into the filling sleeve. On the one hand, the thermal conductive silicone grease can seal the gap of the end cover hole. On the other hand, it can isolate the contact between the guide pins and the end cover. Since the outer shell and the end cover are integrally connected by welding, the end cover is also a metal structure. And the contact between the guide pins and the end cover is likely to cause discharge or leakage. Through the thermal conductive silicone grease, the gap between the guide pins and the holes provided on the end cover can be isolated to prevent the guide pins from contacting the hole walls. At the same time, the thermal conductive silicone grease also has a heat dissipation function. Thus, when the high-voltage pulse capacitor is in use, the heat accumulated on the guide pins can be dissipated to ensure its stability.

[0016] (3) Further, when using the thermal conductive silicone grease for sealing, in order to prevent potential problems such as the change similar to that of epoxy resin at high temperature after the thermal conductive silicone grease absorbs heat, which may lead to poor sealing performance, this application provides another solution. Epoxy resin is prone to thermal expansion and contraction at normal and high temperatures, resulting in poor sealing performance at the connection. The thermal conductive silicone grease in this application itself has better stability compared to epoxy resin and can ensure the sealing performance to a certain extent. Meanwhile, as a precaution, a collar is buried in the thermal conductive silicone grease, and a heat sink is connected to the outside of the collar. The collar is buried in the thermal conductive silicone grease, and the heat generated by the thermal conductive silicone grease can be dissipated to the outside of the filling sleeve through the heat sink, so as to ensure that the thermal conductive silicone grease is at a relatively balanced temperature, and to a certain extent, reduce the volume change caused by its thermal expansion and contraction to ensure its sealing performance. Since the collar and the heat sink are made of metal, their heat dissipation efficiency is better. Therefore, the collar is sleeved on the guide pin without contacting the guide pin to prevent the current on the guide pin from being introduced. Description of the Drawings

[0017] Figure 1 It is a three-dimensional structure diagram of the capacitor.

[0018] Figure 2 It is a partial cross-sectional structure diagram of the capacitor.

[0019] Figure 3 It is Figure 2 A partial enlarged view of the capacitor sealing structure at position A in

[0020] Figure 4 It is a three-dimensional structure diagram of the outer shell.

[0021] Figure 5 It is a disassembled structure diagram of the capacitor.

[0022] The corresponding relationships between the reference numerals in the figures and the component names are as follows: 100, housing; 100a, mounting groove; 101, end cap; 101a, filling sleeve; 101a-1, sealing piece; 101b, collar; 101b-1, heat sink; 102, fixing piece; 102a, ceramic ring; 200, capacitor core; 200a, guide pin. Detailed implementation manners

[0023] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the following provides a detailed description of the specific implementation manners of the present utility model with reference to the accompanying drawings of the specification.

[0024] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model may also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0025] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that may be included in at least one implementation manner of the present utility model. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they separate or alternative embodiments that exclude each other from other embodiments. The present utility model provides the following embodiments.

[0026] Refer to Figure 1 and Figure 2This is the overall structure diagram of the high-voltage pulse capacitor in this embodiment. The high-voltage pulse capacitor in this embodiment includes a housing 100. A capacitor core 200 is assembled inside the housing. An installation groove 100a is formed on the upper surface of the housing 100. A end cap 101 is arranged on the upper surface of the installation groove 100a. The housing 100 and the end cap 101 are welded, so as to form a sealed cavity inside the housing 100. The capacitor core 200 is sealed and protected by using this sealed cavity. Oil can be injected into the sealed cavity to immerse the capacitor core 200, and the sealed cavity can effectively prevent oil leakage. Further, a pair of guide pins 200a are arranged on the upper surface of the capacitor core 200. One of the guide pins 200a serves as an anode contact, and the other guide pin 200a serves as a cathode contact. Through holes for the guide pins 200a to expose are symmetrically formed on the end cap 101. The guide pins 200a serving as electrodes extend out from the through holes. The through holes are areas prone to oil leakage. Therefore, in this embodiment, a filling sleeve 101a is integrally connected to the upper surface of the end cap 101 around the through holes. When the capacitor core 200 is placed inside the housing 100, the guide pins 200a extend to the outside of the filling sleeve 101a through the through holes. Thermal conductive silicone grease is injected into the filling sleeve 101a. The connection gap between the guide pins 200a and the filling sleeve 101a is sealed by using the thermal conductive silicone grease. A sealing sheet 101a-1 is covered on the upper surface of the filling sleeve 101a. The sealing sheet 101a-1 is connected to the filling sleeve 101a by screws. The sealing sheet 101a-1 covers the thermal conductive silicone grease to play a protective role.

[0027] Refer to Figure 3This is a schematic diagram of the capacitor sealing structure in this embodiment. When using thermal conductive silicone grease for sealing, in order to prevent potential problems such as deterioration of the sealing performance caused by changes similar to those of epoxy resin at high temperatures after the thermal conductive silicone grease absorbs heat, a collar 101b is arranged in the filling sleeve 101a in this embodiment. The collar 101b is used to transfer the heat of the thermal conductive silicone grease. Further, a plurality of heat sinks 101b-1 are equidistantly connected to the side surface of the collar 101b, and the heat absorbed from the thermal conductive silicone grease can be dissipated outward through the heat sinks 101b-1, thereby ensuring that the thermal conductive silicone grease is at a relatively balanced temperature, and reducing its volume change caused by thermal expansion and contraction to a certain extent to ensure its sealing performance. For the convenience of assembling the collar 101b, the collar 101b is sleeved on the guide pin 200a in this embodiment. Further, since the collar 101b and the heat sinks 101b-1 are heat dissipation components, a metal structure is adopted to make their heat dissipation efficiency better. To prevent the collar 101b from contacting the guide pin 200a and causing electric leakage, the inner diameter of the collar 101b is made larger than the diameter of the guide pin 200a in this embodiment, and the collar 101b is concentric with the guide pin 200a, so that the collar 101b does not contact the guide pin 200a. At the same time, the collar 101b is fixed under the filling of the thermal conductive silicone grease to ensure that a certain distance is reserved between the collar 101b and the guide pin 200a. Further, a plurality of connection holes are equidistantly arranged in a circumferential manner on the side surface of the filling sleeve 101a, and the number of the connection holes is the same as the number of the heat sinks 101b-1. The heat sinks 101b-1 extend outside the filling sleeve 101a through the connection holes.

[0028] Refer to Figure 4 and Figure 51 is a diagram of the assembly structure of the capacitor in this embodiment. In order to ensure the stability of the high-voltage pulse capacitor, the inner wall of the shell 100 of this embodiment is connected with a fixing sheet 102 in a surrounding manner and at equal intervals. In order to prevent the capacitor core 200 from being interfered by the end of the fixing sheet 102 when placed in the shell 100, the end of the fixing sheet 102 is cut into an inclined structure in this embodiment, so as to facilitate the insertion of the capacitor core 200 so that the capacitor core 200 is placed between the fixing sheets 102; further, a plurality of equidistant embedding grooves are provided on the fixing sheet 102, and the fixing sheet 102 is clamped with a ceramic ring 102a by the embedding groove. The high heat resistance of the ceramic ring 102a prolongs the life of the capacitor, and the moisture resistance of the ceramic capacitor composed of the ceramic ring 102a and the capacitor core 200 is better than that of other types of capacitors. Therefore, the use range of ceramic capacitors is wider and can be used in some humid environments. The dielectric loss of ceramic capacitors is relatively small. In order to ensure the ceramic ring 102 In order to improve the assembly firmness of the ceramic ring 102a and the capacitor core 200, the inner diameter of the ceramic ring 102a is equal to the outer diameter of the capacitor core 200. When the capacitor core 200 is placed in the housing 100, it is tightly fitted with the ceramic ring 102a. Furthermore, the ceramic ring 102a is an arc-shaped structure, and the ceramic rings 102a are symmetrically installed in the fitting grooves at the same height to form a ring structure. At the same time, in order to increase the electrical breakdown resistance of the ceramic ring 102a, there is no gap between the pair of symmetrically installed ceramic rings 102a in this embodiment. The inner core 200 of the capacitor and the ceramic ring 102a are in contact with each other to form two individuals, which indirectly increases the number of ceramic rings 102a in the outer shell 100. It should be noted that in order to facilitate the installation of the ceramic rings 102a, the number of fixing plates 102 in this embodiment is designed to be an even number so as to facilitate the connection of symmetrical ceramic rings 102a. The ceramic rings 102a protrude from the fixing plates 102. When the capacitor core 200 is sleeved with the ceramic rings 102a, a cavity is formed between the capacitor core 200 and the fixing plates 102, which can effectively prevent the current from contacting the outer shell 100.

[0029] The above content is a further detailed description of the utility model in combination with specific implementation methods. It cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, they can also make several simple deductions or substitutions, which should be regarded as belonging to the scope of protection determined by the claims submitted for the utility model.

Claims

1. A high-voltage pulse capacitor includes a capacitor core (200) assembled inside a housing (100). A pair of guide pins (200a) are provided on the upper surface of the capacitor core (200), with one guide pin (200a) serving as an anode contact and the other guide pin (200a) serving as a cathode contact. It is characterized in that: An installation groove (100a) is formed on the upper surface of the housing (100). An end cap (101) is provided on the upper surface of the installation groove (100a). Through holes for the guide pins (200a) to expose are symmetrically formed on the end cap (101). A filling sleeve (101a) is integrally connected to the upper surface of the end cap (101) around the through holes. A sealing sheet (101a-1) covers the upper surface of the filling sleeve (101a), and the sealing sheet (101a-1) is connected to the filling sleeve (101a) by screws. When the capacitor core (200) is placed inside the housing (100), the end cap (101) is hermetically connected to the installation groove (100a). The guide pins (200a) extend through the through holes to the outside of the filling sleeve (101a). Thermal conductive silicone grease is injected into the filling sleeve (101a) to seal the connection gap between the guide pins (200a) and the filling sleeve (101a), and the sealing sheet (101a-1) covers the thermal conductive silicone grease to play a protective role.

2. The high-voltage pulse capacitor according to claim 1, wherein: A collar (101b) is arranged inside the filling sleeve (101a), and the inner diameter of the collar (101b) is larger than the diameter of the guide pin (200a). The collar (101b) is sleeved on the guide pin (200a), and the collar (101b) is concentric with the guide pin (200a). A plurality of heat dissipation fins (101b-1) are equidistantly connected to the side surface of the collar (101b).

3. The high-voltage pulse capacitor according to claim 2, wherein: A plurality of connection holes are formed in a circumferential and equidistant manner on the side surface of the filling sleeve (101a). The number of the formed connection holes is the same as the number of the heat dissipation fins (101b-1), and the heat dissipation fins (101b-1) extend to the outside of the filling sleeve (101a) through the connection holes.

4. The high-voltage pulse capacitor according to claim 1, wherein: Fixing pieces (102) are integrally connected to the inner wall of the housing (100) in a circumferential and equidistant manner, and the number of the fixing pieces (102) is even. The ends of the fixing pieces (102) are cut into inclined surface structures, and the capacitor core (200) is placed between the fixing pieces (102).

5. The high-voltage pulse capacitor according to claim 4, characterized in that: A plurality of fitting grooves are formed at equal intervals on the fixing pieces (102), and ceramic rings (102a) are clamped to the fixing pieces (102) by the fitting grooves. The inner diameter of the ceramic rings (102a) is equal to the outer diameter of the capacitor core (200), and when the capacitor core (200) is placed inside the housing (100), it is in close contact with the ceramic rings (102a).

6. The high-voltage pulse capacitor according to claim 5, wherein: The ceramic rings (102a) are of arc structures, and the ceramic rings (102a) are symmetrically installed in the fitting grooves at the same height, and the pair of symmetrically installed ceramic rings (102a) do not contact each other.

7. The high-voltage pulse capacitor according to claim 6, characterized in that: The ceramic rings (102a) protrude from the fixing pieces (102). When the capacitor core (200) is sleeved with the ceramic rings (102a), a cavity is formed between the capacitor core (200) and the fixing pieces (102).

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