Power capacitor

Abstract

The utility model discloses a power capacitor, and belongs to the technical field of capacitors, and the key points of the technical scheme are that the power capacitor comprises a housing, and the housing comprises a fireproof device which comprises a fireproof plate and a limiting block; the pressure relief device comprises a pressure sensor and a sucking pump; the capacitor body is arranged in the shell; the wire outlet sleeve is connected with the shell; wherein the fireproof plate is rotatably connected with the shell, the limiting block is installed on the shell, the fireproof plate is fixed on the shell through the limiting block, the pressure sensor is arranged in the shell, and the pressure sensor is connected with the air extracting pump. According to the power capacitor provided by the invention, the power capacitor can be effectively prevented from burning, the power capacitor has a pressure relief function, the probability of capacitor explosion is reduced, and the service life of the power capacitor is prolonged at the same time.

Description

Technical Field

[0001] This application belongs to the technical field of capacitors, and particularly relates to a power capacitor. Background Art

[0002] A power capacitor is a capacitor used in a power system and electrical equipment. Any two metal conductors separated by an insulating medium in the middle form a capacitor. The capacitance of a capacitor is determined by its geometric dimensions and the characteristics of the insulating medium between the two plates.

[0003] The existing Chinese patent with the publication number CN216133766U discloses a fireproof power capacitor, including a protective shell. A product label is provided on the front end face of the protective shell. Three terminals are provided on the upper end face of the protective shell. A connector is provided on the upper end face of the protective shell. A fireproof shell is provided on the upper end face of the protective shell. A circular through hole corresponding to the size of the terminals and the connector is provided in the middle of the bottom end face of the fireproof shell. Clamps are fixedly installed on both side faces of the fireproof shell. A card slot is provided in the middle of the upper end face of the fireproof shell. A transparent window is provided at a position close to one side edge of the upper end face of the fireproof shell. Openings are provided at positions on both sides of the card slot on the upper end face of the fireproof shell, and sealing covers are clamped in the openings.

[0004] The above power capacitor is provided with a fireproof shell. The fireproof shell can explode when a danger occurs in the protective shell, thereby protecting the protective shell and enhancing the fireproof function of the capacitor. However, after the fireproof shell of the capacitor explodes, it cannot ensure that the fire extinguishing powder inside the fireproof shell completely covers the capacitor, and it cannot ensure that it can completely extinguish the fire. The fireproof function is unstable, and it does not have a pressure relief function. The capacitor is prone to explosion when the internal air pressure is too high, increasing the probability of a fire. Summary of the Utility Model

[0005] The purpose of this application is to provide a power capacitor aiming at the above existing technical problems, which can effectively avoid the combustion of the power capacitor, has a pressure relief function, reduces the probability of capacitor explosion, and prolongs the service life of the power capacitor.

[0006] This application provides a power capacitor, including a housing, and the housing includes:

[0007] A fireproof device, including a fireproof board and a limiting block;

[0008] A pressure relief device, including a pressure sensor and an air extraction pump;

[0009] A capacitor body, which is placed inside the housing;

[0010] An outgoing line bushing, which is connected to the housing;

[0011] Among them, the fireproof board is rotatably connected to the housing, the limit block is installed on the housing, the fireproof board is fixed on the housing through the limit block, the pressure sensor is placed inside the housing, and the pressure sensor is connected to the air extraction pump.

[0012] In this technical solution, by setting a fireproof device and a pressure relief device on the housing, the fireproof device is provided with a fireproof board and a limit block. The fireproof board is rotatably connected to the housing, and the fireproof board is fixed on the housing through the limit block. When the capacitor body inside the housing accidentally catches fire due to temperature rise, the limit block is triggered to displace, and the limit block pushes the fireproof board to flip to cover the housing, thereby preventing the fire from spreading further and improving the fireproof performance of the power capacitor. The pressure relief device is provided with a pressure sensor and an air extraction pump. The pressure sensor is placed inside the housing, and the pressure sensor is connected to the air extraction pump. After the insulating oil inside the capacitor is used for a period of time, it will be converted into harmful gases and soot, and the air pressure inside the housing will continue to increase. The pressure sensor is used to detect the air pressure inside the housing. When the air pressure inside the housing is relatively large, the pressure sensor triggers the air extraction pump to work, and the air extraction pump extracts the harmful gases and soot inside the housing, thereby reducing the air pressure inside the housing, reducing the probability of explosion of the power capacitor, and at the same time, the housing will not be deformed due to the influence of air pressure, extending the service life of the housing. An outlet bushing is also provided on the housing to facilitate the wiring of the power capacitor.

[0013] Further, the fireproof device includes:

[0014] A torsion spring;

[0015] An electromagnet, including a return spring;

[0016] A permanent magnet, which is installed on the housing;

[0017] A fuse, which is connected to the electromagnet;

[0018] A limit hole, which is placed inside the permanent magnet;

[0019] Among them, the fireproof board is rotatably connected to the housing through the torsion spring, the electromagnet is installed on the limit block, the limit block is matched with the limit hole, the electromagnet is connected to the permanent magnet after being energized, and the fuse is connected to the electromagnet.

[0020] In this technical solution, a torsion spring is provided in the fire protection device. The fire protection board is rotatably connected to the housing through the torsion spring, a permanent magnet is installed on the housing, and an electromagnet is installed on the limit block. After the electromagnet is energized, it is connected to the permanent magnet. When the capacitor body burns due to excessive temperature, the fuse is blown, and at the same time the fuse controls the electromagnet to be energized. After the electromagnet is energized, it is connected to the permanent magnet, so that the limit block and the limit hole cooperate. At this time, the fire protection board is not restricted by the limit block, and the fire protection board is reset and flipped through the torsion spring, covering the housing, thereby avoiding the spread of fire and ensuring the fire protection performance of the power capacitor. A return spring is also provided on the electromagnet, and the limit block can stably fix the fire protection board through the return spring, avoiding the fire protection board from affecting the normal operation of the power capacitor, thereby improving the stability of the power capacitor.

[0021] Further, the fire protection board includes:

[0022] Concave holes, including dry powder;

[0023] Sealing plate, including a through groove and a rack;

[0024] Gear, which is fixedly connected to the fire protection board;

[0025] Among them, the sealing plate is slidably connected to the fire protection board, and the rack is meshed with the gear.

[0026] In this technical solution, by providing concave holes, a sealing plate and a gear on the fire protection board, the gear is fixedly connected to the fire protection board, and the gear is meshed with the rack on the sealing plate. Dry powder is provided in the concave holes, and the sealing plate is slidably connected to the fire protection board. When the capacitor body accidentally catches fire, the fire protection board is flipped under the influence of the torsion spring and drives the gear to rotate. The gear drives the rack to displace, and the rack displacement drives the sealing plate to slide on the fire protection board. At this time, the through groove on the sealing plate is opposite to the concave hole on the fire protection board, and the fire protection board vibrates under the influence of the torsion spring. The dry powder in the concave hole is scattered onto the housing through the through groove. The fire extinguishing effect of the dry powder is good, which can effectively prevent the contact between air and the power capacitor, so that the power capacitor can automatically extinguish fire and has high safety.

[0027] Further, the pressure relief device includes:

[0028] Exhaust gas treatment box, which is connected to the air extraction pump;

[0029] Insulating oil tank, which is connected to the capacitor body;

[0030] Liquid extraction pump, which is connected to the insulating oil tank;

[0031] Among them, the pressure sensor is connected to the liquid extraction pump.

[0032] In this technical solution, an exhaust gas treatment box, an insulating oil tank and a liquid extraction pump are arranged in the pressure relief device. The exhaust gas treatment box is connected to the air extraction pump. The air extraction pump transports the extracted exhaust gas and soot to the exhaust gas treatment box to prevent the exhaust gas and soot from diffusing into the air and polluting the surrounding air environment. The insulating oil tank is connected to the capacitor body. The capacitor body needs to use insulating oil to work properly. The liquid extraction pump on the insulating oil tank is connected to the pressure sensor. When the air extraction pump operates, the pressure sensor triggers the liquid extraction pump to operate simultaneously. The liquid extraction pump is used to extract the insulating oil inside the insulating oil tank so that the insulating oil can be replenished into the capacitor body in time without manual replenishment, reducing the labor cost and enhancing the practicability of this power capacitor.

[0033] Further, a solid adsorbent is arranged in the exhaust gas treatment box;

[0034] Among them, the insulating oil tank is transparent.

[0035] In this technical solution, by arranging a solid adsorbent in the exhaust gas treatment box, after the insulating oil inside the shell decomposes into harmful gases and soot, it is transported to the exhaust gas treatment box by the air extraction pump and adsorbed by the solid adsorbent inside the exhaust gas treatment box to prevent the harmful gases and soot from diffusing into the air, thereby preventing the air around the working environment from being polluted and protecting the physical health of the staff. At the same time, the insulating oil tank is set to be transparent so that the staff can clearly see the insulating oil inside the insulating oil tank. When the insulating oil inside the insulating oil tank is less, it is convenient for the staff to replenish the insulating oil in time, thereby ensuring the stable operation of this power capacitor.

[0036] Further, a flame retardant is sprayed on the outer surface of the capacitor body.

[0037] In this technical solution, by spraying a flame retardant on the outer surface of the capacitor body, the flame retardant can further prevent the contact between the air and the capacitor body, thereby further reducing the probability of the capacitor body catching fire and improving the fire prevention performance of this power capacitor.

[0038] The beneficial effects of this application are:

[0039] 1. When the capacitor body accidentally catches fire, the fireproof board is triggered to flip to cover the shell, thereby preventing the spread of the fire and improving the fire prevention performance. When the air pressure inside the shell is relatively high, the pressure sensor triggers the air extraction pump to operate to extract the harmful gases and soot inside the shell, thereby reducing the air pressure inside the shell and reducing the probability of the power capacitor exploding.

[0040] 2. When the capacitor body catches fire accidentally, the fuse is burned out. At the same time, the electromagnetic body of the fuse is energized. After the electromagnetic body is energized, it is connected to the permanent magnet, enabling the cooperation between the limit block and the limit hole. At this time, the fireproof board flips under the influence of the torsion spring, causing the sealing plate to slide on the fireproof board. The through groove on the sealing plate aligns with the concave hole on the fireproof board. When the fireproof board resets, it vibrates, facilitating the dry powder in the concave hole to be scattered towards the housing, thereby preventing the spread of the fire.

[0041] 3. The air extraction pump transports the extracted waste gas and soot to the waste gas treatment box, where they are adsorbed by the solid adsorbent to prevent the waste gas and soot from diffusing into the air. The liquid extraction pump is used to extract the insulating oil inside the insulating oil tank so that the insulating oil can be timely replenished into the capacitor body, thus ensuring the stable operation of this power capacitor. Description of the Drawings

[0042] Figure 1 is a schematic structural diagram of a power capacitor of this application;

[0043] Figure 2 is a schematic structural diagram inside a power capacitor of this application;

[0044] Figure 3 is Figure 2 an enlarged view of part A;

[0045] Figure 4 is a schematic structural diagram of the fire prevention device during operation;

[0046] In the figure, the reference numerals are as follows: 100, housing; 110, capacitor body; 120, outgoing line bushing; 200, fire prevention device; 210, fireproof board; 211, concave hole; 212, sealing plate; 213, gear; 214, dry powder; 215, through groove; 216, rack; 220, limit block; 230, torsion spring; 240, electromagnetic body; 241, return spring; 250, permanent magnet; 260, fuse; 270, limit hole; 300, pressure relief device; 310, pressure sensor; 320, air extraction pump; 330, waste gas treatment box; 340, insulating oil tank; 350, liquid extraction pump. Detailed Embodiments

[0047] Next, the technical solutions in the embodiments of this application will be clearly described in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of this application.

[0048] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0049] The following provides a detailed description of the embodiments of the present application through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0050] Embodiment 1:

[0051] like Figures 1-4 As shown, the embodiment of the present application provides a power capacitor, including a housing 100, wherein the housing 100 includes:

[0052] The fire protection device 200 includes a fire protection board 210 and a limit block 220;

[0053] The pressure relief device 300 includes a pressure sensor 310 and an air pump 320;

[0054] The capacitor body 110 is disposed in the housing 100;

[0055] An outlet bushing 120 connected to the housing 100;

[0056] Among them, the fireproof plate 210 is rotatably connected to the shell 100, the limit block 220 is installed on the shell 100, the fireproof plate 210 is fixed on the shell 100 through the limit block 220, the pressure sensor 310 is placed in the shell 100, and the pressure sensor 310 is connected to the vacuum pump 320.

[0057] By arranging a fire prevention device 200 and a pressure relief device 300 on the housing 100, there is a fire prevention board 210 and a limit block 220 on the fire prevention device 200. The fire prevention board 210 is rotatably connected to the housing 100, and the fire prevention board 210 is fixed on the housing 100 through the limit block 220. When the capacitor body 110 inside the housing 100 accidentally catches fire due to temperature rise, it triggers the displacement of the limit block 220. The limit block 220 pushes the fire prevention board 210 to flip so as to cover the housing 100, thereby preventing the fire from further spreading and enhancing the fire prevention performance of the power capacitor. There is a pressure sensor 310 and an air extraction pump 320 on the pressure relief device 300. The pressure sensor 310 is placed inside the housing 100 and is connected to the air extraction pump 320. After the insulating oil inside the capacitor is used for a period of time, it will be converted into harmful gases and soot, and the air pressure inside the housing 100 will continuously increase. The pressure sensor 310 is used to detect the air pressure inside the housing 100. When the air pressure inside the housing 100 is relatively large, the pressure sensor 310 triggers the air extraction pump 320 to work. The air extraction pump 320 extracts the harmful gases and soot inside the housing 100, thereby reducing the air pressure inside the housing 100, reducing the probability of the power capacitor explosion, and at the same time, the housing 100 will not be deformed due to the influence of air pressure, extending the service life of the housing 100. There is also an outlet bushing 120 on the housing 100 to facilitate the wiring of the power capacitor.

[0058] Further, the fire prevention device 200 includes:

[0059] A torsion spring 230;

[0060] An electromagnet 240, including a return spring 241;

[0061] A permanent magnet 250, which is installed on the housing 100;

[0062] A fuse 260, which is connected to the electromagnet 240;

[0063] A limit hole 270, which is placed inside the permanent magnet 250;

[0064] Wherein, the fire prevention board 210 is rotatably connected to the housing 100 through the torsion spring 230. The electromagnet 240 is installed on the limit block 220. The limit block 220 cooperates with the limit hole 270. After the electromagnet 240 is powered on, it is connected to the permanent magnet 250. The fuse 260 is connected to the electromagnet 240.

[0065] By arranging a torsion spring 230 in the fire prevention device 200, the fire prevention board 210 is rotationally connected to the housing 100 through the torsion spring 230, a permanent magnet 250 is installed on the housing 100, and an electromagnet 240 is installed on the limit block 220. After the electromagnet 240 is energized, it is connected to the permanent magnet 250. When the capacitor body 110 burns due to excessive temperature, the fuse 260 is blown, and at the same time, the fuse 260 controls the electromagnet 240 to be energized. After the electromagnet 240 is energized, it is connected to the permanent magnet 250, so that the limit block 220 is engaged with the limit hole 270. At this time, the fire prevention board 210 is not restricted by the limit block 220, and the fire prevention board 210 is reset and flipped through the torsion spring 230 to cover the housing 100, thereby avoiding the spread of fire and ensuring the fire prevention performance of the power capacitor. A return spring 241 is also arranged on the electromagnet 240, and the limit block 220 can stably fix the fire prevention board 210 through the return spring 241, preventing the fire prevention board 210 from affecting the normal operation of the power capacitor usually, thereby improving the stability of the power capacitor.

[0066] Further, the fire prevention board 210 includes:

[0067] A concave hole 211, including dry powder 214;

[0068] A sealing plate 212, including a through groove 215 and a rack 216;

[0069] A gear 213, which is fixedly connected to the fire prevention board 210;

[0070] Wherein, the sealing plate 212 is slidably connected to the fire prevention board 210, and the rack 216 is meshed with the gear 213.

[0071] By arranging a concave hole 211, a sealing plate 212 and a gear 213 on the fire prevention board 210, the gear 213 is fixedly connected to the fire prevention board 210, and the gear 213 is meshed with the rack 216 on the sealing plate 212. Dry powder 214 is arranged in the concave hole 211, and the sealing plate 212 is slidably connected to the fire prevention board 210. When the capacitor body 110 catches fire accidentally, the fire prevention board 210 is flipped under the influence of the torsion spring 230 and drives the gear 213 to rotate. The gear 213 then drives the rack 216 to displace, and the displacement of the rack 216 drives the sealing plate 212 to slide on the fire prevention board 210. At this time, the through groove 215 on the sealing plate 212 is opposite to the concave hole 211 on the fire prevention board 210, and the fire prevention board 210 vibrates under the influence of the torsion spring 230, and the dry powder 214 in the concave hole 211 is scattered onto the housing 100 through the through groove 215. The fire extinguishing effect of the dry powder 214 is good, which can effectively prevent the contact between the air and the power capacitor, so that the power capacitor can automatically extinguish the fire and has high safety.

[0072] Embodiment 2:

[0073] AsFigures 1-4 As shown in Figures 1-4 , the embodiment of the present application provides a power capacitor. In addition to including the technical solutions of the above embodiments, it also has the following technical features. The pressure relief device 300 includes:

[0074] An exhaust gas treatment tank 330, which is connected to the air extraction pump 320;

[0075] An insulating oil tank 340, which is connected to the capacitor body 110;

[0076] A liquid extraction pump 350, which is connected to the insulating oil tank 340;

[0077] Wherein, the pressure sensor 310 is connected to the liquid extraction pump 350.

[0078] By arranging an exhaust gas treatment tank 330, an insulating oil tank 340 and a liquid extraction pump 350 in the pressure relief device 300, with the exhaust gas treatment tank 330 connected to the air extraction pump 320, the air extraction pump 320 transports the extracted exhaust gas and soot to the exhaust gas treatment tank 330 to prevent the exhaust gas and soot from diffusing into the air and polluting the surrounding air environment. The insulating oil tank 340 is connected to the capacitor body 110. The capacitor body 110 needs to use insulating oil for normal operation. The liquid extraction pump 350 on the insulating oil tank 340 is connected to the pressure sensor 310. When the air extraction pump 320 operates, the pressure sensor 310 simultaneously triggers the liquid extraction pump 350 to operate. The liquid extraction pump 350 is used to extract the insulating oil inside the insulating oil tank 340 so that the insulating oil can be timely replenished into the capacitor body 110 without manual replenishment, reducing labor costs and enhancing the practicability of this power capacitor.

[0079] Further, a solid adsorbent is arranged in the exhaust gas treatment tank 330;

[0080] Wherein, the insulating oil tank 340 is transparent.

[0081] By arranging a solid adsorbent in the exhaust gas treatment tank 330, after the insulating oil inside the housing 100 decomposes into harmful gases and soot, it is transported to the exhaust gas treatment tank 330 by the air extraction pump 320 and adsorbed by the solid adsorbent inside the exhaust gas treatment tank 330 to prevent the harmful gases and soot from diffusing into the air, thereby preventing the air around the working environment from being polluted and protecting the physical health of the staff. At the same time, the insulating oil tank 340 is set to be transparent so that the staff can clearly see the insulating oil inside the insulating oil tank 340. When the insulating oil inside the insulating oil tank 340 is less, it is convenient for the staff to replenish the insulating oil in time, thus ensuring the stable operation of this power capacitor.

[0082] Further, a flame retardant is sprayed on the outer surface of the capacitor body 110.

[0083] By spraying a flame retardant on the outer surface of the capacitor body 110, the flame retardant can further prevent contact between air and the capacitor body 110, thereby further reducing the probability of a fire occurring in the capacitor body 110 and enhancing the fire prevention performance of this power capacitor.

[0084] It should be noted that in this article, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article or device. Without further limitations, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0085] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. A power capacitor, comprising a housing (100), characterized in that, The housing (100) includes: A fire protection device (200), including a fireproof board (210) and a limit block (220); A pressure relief device (300), including a pressure sensor (310) and an air extraction pump (320); A capacitor body (110), which is placed inside the housing (100); An outlet bushing (120), which is connected to the housing (100); Wherein, the fireproof board (210) is rotatably connected to the housing (100), the limit block (220) is installed on the housing (100), the fireproof board (210) is fixed on the housing (100) through the limit block (220), the pressure sensor (310) is placed inside the housing (100), and the pressure sensor (310) is connected to the air extraction pump (320).

2. The power capacitor according to claim 1, characterized in that, The fire protection device (200) includes: A torsion spring (230); An electromagnet (240), including a return spring (241); A permanent magnet (250), which is installed on the housing (100); A fuse (260), which is connected to the electromagnet (240); A limit hole (270), which is placed inside the permanent magnet (250); Wherein, the fireproof board (210) is rotatably connected to the housing (100) through the torsion spring (230), the electromagnet (240) is installed on the limit block (220), the limit block (220) cooperates with the limit hole (270), the electromagnet (240) is connected to the permanent magnet (250) after being powered on, and the fuse (260) is connected to the electromagnet (240).

3. The power capacitor according to claim 2, characterized in that, The fireproof board (210) includes: A concave hole (211), including dry powder (214); A sealing plate (212), including a through groove (215) and a rack (216); A gear (213), which is fixedly connected to the fireproof board (210); Wherein, the sealing plate (212) is slidably connected to the fireproof board (210), and the rack (216) meshes with the gear (213).

4. A power capacitor according to claim 3, characterized in that, The pressure relief device (300) includes: An exhaust gas treatment box (330), which is connected to the air extraction pump (320); An insulating oil tank (340), which is connected to the capacitor body (110); A liquid extraction pump (350), which is connected to the insulating oil tank (340); Wherein, the pressure sensor (310) is connected to the liquid extraction pump (350).

5. A power capacitor according to claim 4, characterized in that, Solid adsorbents are provided inside the exhaust gas treatment box (330); Wherein, the insulating oil tank (340) is transparent.

6. A power capacitor according to claim 5, characterized in that, The outer surface of the capacitor body (110) is sprayed with a flame retardant.

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