Capacitor

Abstract

The utility model provides a capacitor. The capacitor includes: an insulating housing; the core assembly is arranged in the insulating shell, the core assembly comprises a plurality of cores which are arranged at intervals in the length direction of the insulating shell, the lead ends of every two adjacent cores are electrically connected, each core comprises two epoxy resin plates and an epoxy resin rod which are oppositely arranged, the two ends of each epoxy resin rod are connected with the corresponding epoxy resin plate, and the epoxy resin plates are connected with the epoxy resin rods. The epoxy resin rod and the two epoxy resin plates are encircled to form a mounting space; the impregnant is positioned between the core component and the insulating shell; and the expander is arranged between one end of the core assembly and the inner surface of the insulating shell. According to the utility model, the problem that a plurality of cores of a capacitor in the prior art are easy to shift so that a core assembly is easy to incline is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage capacitors, and more specifically, to a capacitor. Background Art

[0002] At present, with the continuous development of the power industry, various types and varieties of power capacitors have been formed. Such as: high-voltage shunt capacitors, low-voltage shunt capacitors, self-healing low-voltage shunt capacitors, assembled shunt capacitors, series capacitors, high-voltage AC filter capacitors, AC motor capacitors, coupling capacitors and capacitive voltage dividers, circuit breaker capacitors, pulse capacitors and compressed gas standard capacitors, etc. Among them, capacitive voltage dividers, coupling capacitors, high-voltage capacitive voltage dividers for measurement, resonant capacitors in high-voltage series resonance test equipment, and circuit breaker grading capacitors all have a common feature in terms of structure, that is, their outer shells are insulating cylinder type, porcelain or silicone rubber composite outer sleeves, and the capacitor cores are all composed of dozens to hundreds of capacitor elements connected in series. And the series connection method and winding structure of the capacitor elements are related to the electrical performance of the product.

[0003] In the prior art, there are mainly the following several capacitor element winding structures and series connection methods:

[0004] The first one belongs to an earlier type, called "hidden foil type", which is formed by winding and flattening after arranging the insulating medium and aluminum foil in an alternating overlapping manner. The aluminum foil is indented by a certain size compared to the medium. The lead pieces are processed from copper foil with a thickness of about 0.1 mm. During the element winding process, one end of 2 lead pieces is inserted into the element in sequence, closely attached to 2 layers of aluminum foil electrodes respectively, and the other end is exposed outside the element. The lead pieces are isolated by insulating gaskets. Then a group of elements are stacked and pressed tightly, and the lead pieces are welded together in the way of element series connection to form a capacitor core. This structure has a high plate utilization rate and is simple to process. However, due to the large number of hundreds of elements, the welding workload is large, the production efficiency is low, and the burrs on the edges of the lead pieces may also damage the insulating medium.

[0005] The second type is an improvement based on the first type. Aluminum foil is used as the lead piece to replace the copper foil lead piece. The aluminum foil lead piece is slightly narrower than the width of the component, with a thickness of about 0.5 - 1.0 mm. During the winding process of the component, the aluminum foil lead piece is pre-placed in the component. The component winding still adopts the hidden foil structure. The lead-out ends can be led out from both ends of the component or, like the first type, from one end. Considering the convenience of the winding process, it is usually led out from one end of the component. The lead pieces are isolated by insulating gaskets. Before pressing, the lead-out ends of the two aluminum foils are folded from the end of the component, one up and one down, to the upper and lower large surfaces of the component, and then tangent and pressed tightly together with the lead-out ends of the aluminum foil lead pieces of the adjacent component, thus realizing the series connection between the capacitor components. The processing technology of the components and cores with this structure is simple and the connection is reliable. It avoids the quality defects that may be caused by the manual welding of the copper foil lead piece in the first method, improves the production efficiency, and reduces the material and processing costs. However, it does not fundamentally change the possible damage to the dielectric caused by the sharp corner burrs on the upper edge of the lead piece.

[0006] The third type is to remove the lead piece on the basis of the first and second types, adopt the protruding structure of the aluminum foil electrode plate, and directly weld the protruding aluminum foil electrodes of adjacent components together alternately left and right by soldering. This structure avoids the damage to the insulating dielectric caused by the lead piece connection structure and the influence of the edge effect and the pressing effect, and also simplifies the production process flow. However, this structure is prone to quality defects such as false soldering and damage during the series welding of components. Especially when the capacitance is small and the components are thin, it will cause difficulties in series welding.

[0007] The fourth type is proposed on the basis of overcoming the welding difficulties of the third type. The components are press-connected to achieve series connection, but still adopt the hidden foil structure for winding and no longer place lead pieces. After the components are wound, the ends of the two aluminum foil electrode plates at the end are respectively exposed on the upper and lower large surfaces of the component, and the adjacent components are pressed tightly against each other to achieve series connection. This structure greatly simplifies the production process and has a simple idea. However, after the components are wound, they need to be manually trimmed, with slow efficiency and potential quality hazards.

[0008] In summary, in the prior art, the components are connected in series by using the process of tin-coated welding wire or direct press connection between components. Due to the small size and large quantity of the components, the components are prone to displacement during pressing. Therefore, the prior art adopts the scheme of fixing with clamping plates around. However, the above fixing method is manual operation and the speed is slow. In addition, when the components are heavy, displacement will also be caused during handling. In order to avoid displacement, the clamping plate fixing will be very firm, which will damage the physical properties of the insulating dielectric to a certain extent, and the pressure of the upper component on the lower component always exists. Utility Model Content

[0009] The main purpose of the present utility model is to provide a capacitor, so as to solve the problem that the cores of the capacitor in the prior art are prone to shift among multiple cores, resulting in the core assembly being prone to tilt.

[0010] To achieve the above object, the present utility model provides a capacitor, comprising: an insulating housing; a core assembly disposed within the insulating housing, the core assembly including a plurality of cores spaced along the length direction of the insulating housing, and the lead ends between adjacent cores being electrically connected; each core including two epoxy resin plates and an epoxy resin rod disposed opposite to each other, the two ends of the epoxy resin rod being respectively connected to the epoxy resin plates, so that the epoxy resin rod and the two epoxy resin plates surround to form an installation space; an impregnating agent located between the core assembly and the insulating housing; and an expander disposed between one end of the core assembly and the inner surface of the insulating housing.

[0011] Further, the core assembly further includes: an insulating fastener, and adjacent cores are connected through the insulating fastener.

[0012] Further, the insulating housing includes an epoxy tube, a cover plate and a bottom plate, the cover plate and the bottom plate are respectively disposed at both ends of the epoxy tube, and the expander is connected to the cover plate; the cover plate includes a first flange and a first plate body, the first flange is sleeved on the first end of the epoxy tube, and the first plate body is connected to the first flange and seals the first end; and / or, the bottom plate includes a second flange and a second plate body, the second flange is sleeved on the second end of the epoxy tube, and the second plate body is connected to the second flange and seals the second end.

[0013] Further, the epoxy tube is a glass fiber epoxy tube; and / or, the wall thickness of the epoxy tube is greater than or equal to 10 mm and less than or equal to 20 mm.

[0014] Further, the cover plate has an oil injection hole; and / or, the first plate body has a first countersunk hole, and the first plate body and the first flange are connected by passing a fastener through the first countersunk hole and the first flange; and / or, the first plate body has a mounting hole, and at least a part of the expander extends into the mounting hole and is connected to the mounting hole.

[0015] Further, each core further includes: a core body located within the installation space, the core body including a plurality of mutually stacked capacitor elements, each capacitor element being wound by two sets of all-polypropylene films and two aluminum foil plates, and the two aluminum foil plates of each capacitor element have two electrodes extending from opposite edges of the all-polypropylene film.

[0016] Further, the epoxy resin plate is a circular plate, the outer diameter D of the circular plate is smaller than the inner diameter d of the epoxy tube, and the difference between the outer diameter D and the inner diameter d is greater than or equal to 8 mm and less than or equal to 12 mm; and / or, each core includes a plurality of epoxy resin rods, and the plurality of epoxy resin rods are spaced around the central axis of the core.

[0017] Further, at least one epoxy resin board has a wire passing hole for the lead end to pass through.

[0018] Further, the length of each electrode is greater than or equal to 15 mm.

[0019] Further, the expander is a metal bellows type expander; and / or, the impregnating agent is a benzyl toluene liquid insulating medium.

[0020] Applying the technical solution of the present utility model, the capacitor includes an insulating shell, a core assembly, an impregnating agent, and an expander. The core assembly is disposed inside the insulating shell. The core assembly includes a plurality of cores arranged at intervals along the length direction of the insulating shell. The lead ends between adjacent two cores are electrically connected. Each core includes two epoxy resin boards and an epoxy resin rod disposed opposite to each other. The two ends of the epoxy resin rod are respectively connected to the two epoxy resin boards so that the epoxy resin rod and the two epoxy resin boards surround to form an installation space. The impregnating agent is located between the core assembly and the insulating shell. The expander is disposed between one end of the core assembly and the inner surface of the insulating shell. Among them, the insulating shell includes an epoxy tube, a cover plate, and a bottom plate. The cover plate and the bottom plate are respectively disposed at both ends of the epoxy tube, and the expander is connected to the cover plate. In this way, the above-mentioned structure of the core not only realizes the segmented design of the core assembly, each core can be independently processed without mutual influence and is easy to operate, but also improves the overall structural stability of the core assembly. Even when subjected to external forces, it is not prone to tilt, thus solving the problem that the cores in the capacitor in the prior art are prone to shift and cause the core assembly to be prone to tilt. At the same time, each capacitor element is wound with an aluminum foil protruding structure instead of a concealed inserted lead piece structure, and a full film dielectric is used, so that the insulation strength of each capacitor element is greatly improved and the dielectric loss is greatly reduced, thereby simplifying the raw material procurement and manufacturing process. Description of the Drawings

[0021] The schematic diagrams of the specification that form a part of this application are used to provide a further understanding of the present utility model. The illustrative embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0022] Figure 1 Shows a cross-sectional view of an embodiment of a capacitor according to the present utility model;

[0023] Figure 2 Shows Figure 1 the structural schematic diagram of the insulating shell of the capacitor in

[0024] Figure 3 Shows Figure 2 the front view of the first plate body of the insulating shell in

[0025] Figure 4 Shows Figure 3Side view of the first plate body in

[0026] Figure 5 Shows Figure 2 Front view of the second plate body of the insulating housing in

[0027] Figure 6 Shows Figure 1 Schematic three-dimensional structure diagram of the core assembly of the capacitor in

[0028] Figure 7 Shows Figure 6 Schematic three-dimensional structure diagram of the core in

[0029] Figure 8 Shows Figure 7 Front view of the epoxy resin board of the core in

[0030] Figure 9 Shows Figure 7 Front view of the epoxy resin rod of the core in

[0031] Figure 10 Shows Figure 7 Front view of the core body of the core in

[0032] Figure 11 Shows Figure 10 Side view of the core body in

[0033] Figure 12 Shows Figure 10 Schematic winding diagram of the all-polypropylene film and aluminum foil electrode plates of the core body in

[0034] Figure 13 Shows Figure 1 Schematic structure diagram of the expander of the capacitor in

[0035] Among them, the above-mentioned drawings include the following reference numerals:

[0036] 10. Insulating housing; 11. Epoxy tube; 12. Cover plate; 121. First flange; 122. First plate body; 1221. First countersunk hole; 1222. Mounting hole; 1223. First base threaded hole; 1224. Lead wire threaded hole; 123. Oil filling hole; 13. Bottom plate; 131. Second flange; 132. Second plate body; 1321. Second countersunk hole; 1322. Second base threaded hole;

[0037] 20. Core assembly; 21. Core; 211. Epoxy resin board; 2111. Wire passing hole; 2112. Third countersunk hole; 212. Core body; 2121. All-polypropylene film; 2122. Aluminum foil electrode plate; 213. Epoxy resin rod; 2131. Connecting threaded hole; 214. Electrical cardboard; 215. Filling electrical cardboard; 216. Insulating gasket;

[0038] 30. Impregnant;

[0039] 40. Expander;

[0040] 50. Aluminum sheet. Specific embodiments

[0041] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0042] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0043] In the present utility model, unless otherwise stated, the orientation terms such as "upper, lower" are usually in the direction shown in the drawings, or in the vertical, perpendicular or gravitational direction; similarly, for the convenience of understanding and description, "left, right" are usually the left and right shown in the drawings; "inside, outside" refer to the inside and outside relative to the contour of each component itself, but the above orientation terms are not used to limit the present utility model.

[0044] In order to solve the problem that the cores of a capacitor in the prior art are prone to shift between multiple cores, resulting in the core assembly being prone to tilt, this application provides a capacitor.

[0045] As Figures 1 to 13 shown, the capacitor includes an insulating housing 10, a core assembly 20, an impregnant 30 and an expander 40. The core assembly 20 is disposed inside the insulating housing 10. The core assembly 20 includes a plurality of cores 21 spaced along the length direction of the insulating housing 10, and the lead ends between adjacent two cores 21 are electrically connected. Each core 21 includes two epoxy resin plates 211 and an epoxy resin rod 213 disposed opposite to each other. The two ends of the epoxy resin rod 213 are respectively connected to the epoxy resin plates 211, so that the epoxy resin rod 213 and the two epoxy resin plates 211 surround to form an installation space. The impregnant 30 is located between the core assembly 20 and the insulating housing 10. The expander 40 is disposed between one end of the core assembly 20 and the inner surface of the insulating housing 10.

[0046] Applying the technical solution of this embodiment, the above structural arrangement of the core not only realizes the segmented design of the core assembly, enables each core to be independently processed without mutual influence and is easy to operate, but also improves the overall structural stability of the core assembly, making it not prone to tilt even when subjected to external forces, thereby solving the problem in the prior art that the cores of a capacitor are prone to displacement and the core assembly is prone to tilt. At the same time, each capacitor element is wound with an aluminum foil protruding structure instead of a concealed inserted lead sheet structure, and a full-film dielectric is used to greatly improve the insulation strength and greatly reduce the dielectric loss of each capacitor element, so as to simplify the raw material procurement and manufacturing process.

[0047] In this embodiment, the core assembly 20 further includes an insulating fastener. Among them, two adjacent cores 21 are connected by the insulating fastener. In this way, the above arrangement realizes the insulating connection between two adjacent cores 21 on the one hand; on the other hand, it makes the disassembly and assembly of two adjacent cores 21 easier and simpler, reducing the disassembly and assembly difficulty of the core assembly 20.

[0048] Optionally, the insulating fastener is a screw or bolt made of an insulating material.

[0049] Optionally, the insulating housing 10 includes an epoxy tube 11, a cover plate 12 and a bottom plate 13. The cover plate 12 and the bottom plate 13 are respectively arranged at both ends of the epoxy tube 11, and the expander 40 is connected to the cover plate 12. The cover plate 12 includes a first flange 121 and a first plate body 122. The first flange 121 is sleeved on the first end of the epoxy tube 11, and the first plate body 122 is connected to the first flange 121 and seals the first end; and / or, the bottom plate 13 includes a second flange 131 and a second plate body 132. The second flange 131 is sleeved on the second end of the epoxy tube 11, and the second plate body 132 is connected to the second flange 131 and seals the second end. In this way, the above arrangement makes the structure of the cover plate 12 and / or the bottom plate 13 simpler, easier to process and realize, and reduces the processing cost of the cover plate 12 and / or the bottom plate 13.

[0050] In this embodiment, the cover plate 12 includes a first flange 121 and a first plate body 122. The first flange 121 is sleeved on the first end of the epoxy tube 11, and the first plate body 122 is connected to the first flange 121 and seals the first end. The bottom plate 13 includes a second flange 131 and a second plate body 132. The second flange 131 is sleeved on the second end of the epoxy tube 11, and the second plate body 132 is connected to the second flange 131 and seals the second end. Among them, the first flange 121 and the second flange 131 are in a cylindrical shape, and the first plate body 122 and the second plate body 132 respectively seal both ends of the epoxy tube 11 to form a sealed installation cavity with the epoxy tube 11.

[0051] Specifically, the epoxy tube 11, the first flange 121, and the second flange 131 are of cavity structure and are integrated by gluing. The first flange 121 and the first plate body 122, and the second flange 131 and the second plate body 132 are fixedly connected by a sealing ring and bolts to form a cavity seal.

[0052] Optionally, the epoxy tube 11 is a fiberglass epoxy tube; and / or, the wall thickness of the epoxy tube 11 is greater than or equal to 10 mm and less than or equal to 20 mm. In this way, the above settings make the selection of the thickness of the epoxy tube 11 more flexible to meet different usage requirements and working conditions, and also improve the processing flexibility of the staff.

[0053] In this embodiment, the epoxy tube 11 is a fiberglass epoxy tube, and the wall thickness of the epoxy tube 11 is 15 mm.

[0054] It should be noted that the selection of the wall thickness of the epoxy tube 11 is not limited to this and can be adjusted according to the working conditions and usage requirements. Optionally, the wall thickness of the epoxy tube 11 is 12 mm, or 14 mm, or 16 mm, or 18 mm.

[0055] Optionally, the cover plate 12 has an oil injection hole 123; and / or, the first plate body 122 has a first countersunk hole 1221, and the first plate body 122 and the first flange 121 are connected by passing a fastener through the first countersunk hole 1221 and the first flange 121; and / or, the first plate body 122 has a mounting hole 1222, and at least part of the expander 40 extends into the mounting hole 1222 and is connected to the mounting hole 1222. In this way, the above settings make the fasteners connecting the cover plate 12 and the bottom plate 13 located in the first countersunk hole 1221, avoiding the protrusion of the fasteners and affecting the connection stability between the two, and also being able to reduce the overall length of the capacitor after assembly. At the same time, the above settings of the mounting hole 1222 increase the connection area between the cover plate 12 and the expander 40, thereby improving the assembly stability between the two.

[0056] In this embodiment, the cover plate 12 has an oil injection hole 123, the first plate body 122 has a first countersunk hole 1221, and the first plate body 122 and the first flange 121 are connected by passing a fastener through the first countersunk hole 1221 and the first flange 121. The first plate body 122 has a mounting hole 1222, and at least part of the expander 40 extends into the mounting hole 1222 and is connected to the mounting hole 1222. Among them, after injecting oil through the oil injection hole 123, the oil injection hole 123 is sealed by an oil plug, and the sealing performance is enhanced by soldering.

[0057] As Figure 3 shown, the first plate body 122 has a first base threaded hole 1223 and a lead threaded hole 1224. The first base threaded hole 1223 is used for connecting to the base during on-site use, and the lead threaded hole 1224 is used for the lead of the core 21.

[0058] As Figure 5 shown, the second plate body 132 has a second countersunk hole 1321 and a second base threaded hole 1322. By passing a fastener through the second countersunk hole 1321 and the second flange 131, the second plate body 132 and the second flange 131 are connected. The second base threaded hole 1322 is used to connect to the base during on-site use.

[0059] As Figure 7 shown, each core 21 further includes a core body 212. Among them, the core body 212 is located in the installation space. The core body 212 includes a plurality of mutually stacked capacitor elements. Each capacitor element is wound by two sets of all-polypropylene films 2121 and two aluminum foil plates 2122. The two aluminum foil plates 2122 of each capacitor element have two electrodes extending from opposite edges of the all-polypropylene film 2121. In this way, the above settings ensure that each core 21 is straight and not inclined, facilitating loading into the insulating housing 10. At the same time, the above settings make the structure of each core 21 simpler, easier to process and implement, reducing the processing cost and difficulty of each core 21.

[0060] In this embodiment, the two epoxy resin plates 211 are arranged parallel to each other.

[0061] Optionally, there are a plurality of epoxy resin rods 213, and the plurality of epoxy resin rods 213 are arranged at intervals around the circumference of the core body 212. Among them, all the epoxy resin rods 213 are arranged parallel to each other.

[0062] Optionally, the epoxy resin plate 211 is a circular plate, the outer diameter D of the circular plate is smaller than the inner diameter d of the epoxy tube 11, and the difference between the outer diameter D and the inner diameter d is greater than or equal to 8 mm and less than or equal to 12 mm; and / or, each core 21 includes a plurality of epoxy resin rods 213, and the plurality of epoxy resin rods 213 are arranged at intervals around the central axis of the core 21. In this way, the above settings avoid structural interference between the epoxy resin plate 211 and the inner surface of the epoxy tube 11, which affects the disassembly and assembly difficulty of the two. On the premise of ensuring that there is no structural interference between the epoxy resin plate 211 and the epoxy tube 11, the above difference between the outer diameter D and the inner diameter d increases the occupied space of each core 21 in the epoxy tube 11, greatly improving the operating efficiency of the capacitor. At the same time, the above settings make the distribution of the plurality of epoxy resin rods 213 more compact, further improving the overall structural stability of the core assembly.

[0063] In this embodiment, the difference between the outer diameter D of the epoxy resin plate 211 and the inner diameter d of the epoxy tube 11 is 10 mm.

[0064] It should be noted that the value of the difference between the outer diameter D of the epoxy resin plate 211 and the inner diameter d of the epoxy resin tube 11 is not limited to this, and can be adjusted according to the working conditions and usage requirements. Optionally, the difference between the outer diameter D of the epoxy resin plate 211 and the inner diameter d of the epoxy resin tube 11 is 9 mm or 11 mm.

[0065] As Figure 7 shown, at least one epoxy resin plate 211 has a wire passing hole 2111 for the lead end to pass through. In this way, after series or parallel connection is completed between two adjacent cores 21, the lead end passes through the wire passing hole 2111, making the wiring inside the core assembly 20 neater.

[0066] Specifically, when several cores 21 are connected in series end to end, they are crimped with the twisted pair of the connector and then crimped and connected to the protruding part of the aluminum foil electrode plate 2122 of the core body 212, and the twisted wire passes through the wire passing hole 2111.

[0067] Optionally, the wire passing hole 2111 is a square hole.

[0068] In this embodiment, the length of each electrode is greater than or equal to 15 mm. In this way, the above setting is beneficial to the series connection of the aluminum foil electrode plate 2122 on the ultrasonic welding machine.

[0069] Optionally, the expander 40 is a metal bellows type expander; and / or, the impregnating agent 30 is a benzyltoluene liquid insulating medium. In this way, the above setting makes the expander 40 a volume compensator for compensating the volume change of the impregnating agent 30 inside the product due to temperature change, and it is a protection device for preventing the oil in such products from getting damp, aging, and deteriorating. At the same time, the benzyltoluene liquid insulating medium can be applied to extremely cold regions of -40°C.

[0070] As Figure 7 and Figure 8 shown, the epoxy resin plate 211 has a third counterbore 2112. By passing a fastener through the third counterbore 2112 of two adjacent cores 21, the two adjacent cores 21 are connected.

[0071] As Figure 9 shown, both ends of the epoxy resin rod 213 have connecting threaded holes 2131. By passing a fastener through the epoxy resin plate 211 and the connecting threaded holes 2131, the epoxy resin plate 211 and the epoxy resin rod 213 are connected.

[0072] As Figure 10 and Figure 11As shown, the core 212 further includes insulating cardboard 214, filled insulating cardboard 215, and insulating gasket 216. After the core 212 and the insulating gasket 216 are placed in sequence, they are connected in series by an aluminum sheet 50 on an ultrasonic welding machine, without damaging the components and with high efficiency. Then, the insulating cardboard 214 and the filled insulating cardboard 215 are packed in sequence on a packing machine.

[0073] As Figure 11 shown, after the components in the core 212 are connected in series, two lead wires L1 and L2 are led out from both ends respectively, serving as the two poles of the capacitor, and then connected to other cores 212.

[0074] Optionally, the diameter of the epoxy tube 11 ranges from about 160 to 450 mm, and the height ranges from 1500 to 6000 mm. The thickness and diameter of the first plate body 122 and the second plate body 132 change with the size of the epoxy tube 11, and the size and structure of the first flange 121 and the second flange 131 also change with the size of the epoxy tube 11.

[0075] Optionally, the first plate body 122 is made of aluminum alloy material or a plating treatment is applied to a common steel plate material.

[0076] Optionally, the second plate body 132 is made of aluminum alloy material or a plating treatment is applied to a common steel plate material.

[0077] Optionally, the first flange 121 is made of aluminum alloy material or a plating treatment is applied to a common steel plate material.

[0078] Optionally, the second flange 131 is made of aluminum alloy material or a plating treatment is applied to a common steel plate material.

[0079] Optionally, the surface of the epoxy tube 11 is spray-painted and printed with the product voltage rating and capacitance value.

[0080] In this embodiment, the specific processing steps of the capacitor are as follows:

[0081] Step 1: Use a fully polypropylene film 2121 and an aluminum foil electrode plate 2122 to wind on a winding machine according to design parameters, and measure the withstand voltage and capacitance of the components, and screen out unqualified components.

[0082] Step 2: The qualified components after screening and the insulating gasket 216 are placed and connected in series according to the drawing requirements, and then press-fitted and packed. Prepare an epoxy resin board 211 and an epoxy resin rod 213 to be connected by insulating bolts, place the component group after press-fitting and packing and with the two ends lead wires already connected on the epoxy resin board 211, fill the empty part between the component group and the epoxy resin board 211 with insulating cardboard 214, and then install the upper epoxy resin board 211. At this time, one core 21 is assembled.

[0083] Step 3: According to the method in Step 2, complete the assembly of the other cores 21.

[0084] Step 4: Use insulating bolts to sequentially connect the cores 21 completed in Step 2 and Step 3 into a whole. For the body assembly with a height less than 2m, all the cores can be assembled and then the insulating shell 10 can be installed. For those with a relatively high height, they need to be connected one by one and the shell needs to be installed step by step.

[0085] Step 5: After all the body assemblies are installed in the insulating shell 10, when installing the insulating shell 10, the bottom plate 13 and the cover plate 12 are both open. Finally, connect the lead wires at both ends and seal the bottom plate 13 and the cover plate 12.

[0086] Step 6: The capacitor is subjected to vacuum drying and impregnation treatment through the oil filling hole 123. Finally, install the expander 40 and apply a certain pressure according to the temperature curve, seal it to form a finished product, and then perform appearance treatment.

[0087] From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:

[0088] The capacitor includes an insulating shell, a core assembly, an impregnating agent, and an expander. The core assembly is arranged inside the insulating shell. The core assembly includes a plurality of cores arranged at intervals along the length direction of the insulating shell. The lead ends between adjacent two cores are electrically connected. Each core includes two epoxy resin plates and an epoxy resin rod arranged oppositely. The two ends of the epoxy resin rod are respectively connected to the epoxy resin plates, so that the epoxy resin rod and the two epoxy resin plates surround to form an installation space. The impregnating agent is located between the core assembly and the insulating shell. The expander is arranged between one end of the core assembly and the inner surface of the insulating shell. Among them, the insulating shell includes an epoxy tube, a cover plate, and a bottom plate. The cover plate and the bottom plate are respectively arranged at both ends of the epoxy tube, and the expander is connected to the cover plate. In this way, the above structural arrangement of the core not only realizes the segmented design of the core assembly, each core can be independently processed without affecting each other and is easy to operate, but also improves the overall structural stability of the core assembly. Even under external force, it is not easy to tilt, thus solving the problem that the cores in the capacitor in the prior art are prone to shift and cause the core assembly to be prone to tilt. At the same time, each capacitor element is wound with an aluminum foil protruding structure instead of a concealed inserted lead piece structure, and a full film dielectric is used, so that the insulation strength of each capacitor element is greatly improved and the dielectric loss is greatly reduced, so as to simplify the raw material procurement and manufacturing process.

[0089] Obviously, the above-described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0090] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0091] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order different from those illustrated or described herein.

[0092] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A capacitor, characterized in that, Comprising: An insulating housing (10); A core assembly (20) disposed within the insulating housing (10), the core assembly (20) including a plurality of cores (21) spaced along the length direction of the insulating housing (10), and the lead ends between adjacent cores (21) being electrically connected; each of the cores (21) includes two epoxy resin plates (211) and an epoxy resin rod (213) disposed opposite to each other, and both ends of the epoxy resin rod (213) are respectively connected to the epoxy resin plates (211), so that the epoxy resin rod (213) and the two epoxy resin plates (211) surround to form an installation space; An impregnating agent (30) located between the core assembly (20) and the insulating housing (10); An expander (40) disposed between one end of the core assembly (20) and the inner surface of the insulating housing (10).

2. The capacitor according to claim 1, characterized in that, The core assembly (20) further includes: Insulating fasteners, and adjacent cores (21) are connected by the insulating fasteners.

3. The capacitor according to claim 1, wherein, The insulating housing (10) includes an epoxy tube (11), a cover plate (12) and a bottom plate (13), the cover plate (12) and the bottom plate (13) are respectively disposed at both ends of the epoxy tube (11), and the expander (40) is connected to the cover plate (12); The cover plate (12) includes a first flange (121) and a first plate body (122), the first flange (121) is sleeved on the first end of the epoxy tube (11), and the first plate body (122) is connected to the first flange (121) and seals the first end; and / or, The bottom plate (13) includes a second flange (131) and a second plate body (132), the second flange (131) is sleeved on the second end of the epoxy tube (11), and the second plate body (132) is connected to the second flange (131) and seals the second end.

4. The capacitor according to claim 3, characterized in that, The epoxy tube (11) is a fiberglass epoxy tube; and / or, the wall thickness of the epoxy tube (11) is greater than or equal to 10 mm and less than or equal to 20 mm.

5. The capacitor according to claim 3, wherein The cover plate (12) has an oil injection hole (123); and / or, The first plate body (122) has a first countersunk hole (1221), and the first plate body (122) and the first flange (121) are connected by passing a fastener through the first countersunk hole (1221) and the first flange (121); and / or, The first plate body (122) has a mounting hole (1222), and at least a part of the expander (40) extends into the mounting hole (1222) and is connected to the mounting hole (1222).

6. The capacitor according to claim 1, wherein, Each of the cores (21) further includes: The core body (212) is located within the installation space. The core body (212) includes a plurality of capacitively coupled elements stacked on top of each other. Each capacitively coupled element is formed by winding two sets of all-polypropylene films (2121) and two aluminum foil plates (2122). The two aluminum foil plates (2122) of each capacitively coupled element have two electrodes extending from opposite edges of the all-polypropylene film (2121).

7. The capacitor according to claim 3, wherein the epoxy resin plate (211) is a circular plate, the outer diameter D of the circular plate is smaller than the inner diameter d of the epoxy tube (11), and the difference between the outer diameter D and the inner diameter d is greater than or equal to 8 mm and less than or equal to 12 mm; and / or each core (21) includes a plurality of epoxy resin rods (213), and the plurality of epoxy resin rods (213) are arranged at intervals around the central axis of the core (21).

8. The capacitor according to claim 1, wherein At least one of the epoxy resin plates (211) has a wire passing hole (2111) for allowing the lead end to pass through.

9. The capacitor according to claim 6, wherein The length of each electrode is greater than or equal to 15 mm.

10. The capacitor according to claim 1, characterized in that, The expander (40) is a metal bellows type expander; and / or the impregnating agent (30) is a benzyltoluene liquid insulating medium.

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