Explosion-proof capacitor

Abstract

The utility model provides an explosion-proof capacitor, which comprises a cylindrical aluminum metal shell, a shell pressing edge, a metal shell, a metal shell, a metal shell, a metal shell, a metal shell, a metal shell, a metal shell, a metal shell, a metal shell and a metal shell, and is characterized in that a cavity is formed in the shell; a plurality of independent MKP windings, wherein the plurality of independent MKP windings are fixedly arranged in the cavity; the plurality of independent MKP windings are arranged in the cavity, the metal lead is connected with the plurality of independent MKP windings and extends out of the shell to form a wiring terminal, the metal lead is in a tightened state in the cavity, and at least one breakpoint is arranged on the metal lead. According to the capacitor, a plurality of independent MKP windings are adopted to replace a traditional capacitor core, the internal structure of the capacitor is simplified, the breakpoint design on the metal wire enables the current to be cut off in time when the capacitor breaks down and is about to explode, so that explosion accidents are effectively prevented, and the safety performance of the capacitor is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electrical equipment, especially an explosion -proof capacitor. BACKGROUND

[0002] In industrial production, capacitors as important electrical components are widely used in power systems, electronic devices and automation control fields. However, in some special environments, such as oil, chemical industry, mine and other flammable and explosive places, ordinary capacitors have safety hazards due to the limitation of their internal structure and materials, which can easily cause explosion accidents.

[0003] The prior art patent file with the application number CN202210050240.7 provides a kind of temperature output signal explosion -proof low voltage power compensation capacitor, including aluminum shell, capacitor core and insulating cover, the capacitor core is fixedly installed in the inside of aluminum shell, the insulating cover is fixedly installed at the upper end of aluminum shell, characterized in that, the inside of aluminum shell is located at the upper part of capacitor core and is equipped with upper fixed sleeve, the inside of aluminum shell is located at the lower part of capacitor core and is equipped with lower fixed sleeve, the upper end of insulating cover movably installs terminal, and terminal is connected between insulating cover and terminal positioning sleeve, the side surface outer surface of terminal movably installs mobile sleeve for fixing wire, and the inside of terminal is penetrated and is equipped with threading groove for wiring;Terminal and mobile sleeve are connected through limit clasp, and the side surface outer surface lower part position of terminal movably installs limit ring.

[0004] The explosion -proof principle of the above -mentioned capacitor is to use flame -retardant material as the outer package of capacitor core, and at the same time, wrap green shell paper as insulating material, and then install temperature sensor in the inside of capacitor. When capacitor is damaged or temperature reaches corresponding critical point, temperature sensor will give a corresponding electric signal to the outside world, so that the system gives action in advance.

[0005] However, although the above-mentioned capacitor can prevent explosion, its structure is complex, and the maintenance cost is high. In addition, although the introduction of temperature sensor increases the safety monitoring function, it also increases the volume and cost of capacitor. Therefore, the utility model provides a new type of explosion -proof capacitor, which aims to simplify the structure, reduce the cost, and improve the safety performance in extreme environment. UTILITY MODEL CONTENTS

[0006] In view of the above problems, the present application provides an explosion -proof capacitor, which comprises:

[0007] The cylindrical aluminum metal shell is formed with a cavity in the inside of the shell, and the shell is formed with a shell pressing edge recessed into the inside of the cavity;

[0008] A plurality of independent MKP windings are fixedly installed in the cavity.

[0009] Metal wires connect the plurality of independent MKP windings and extend out of the shell to form a terminal, and at least one breaking point is arranged on the metal wires.

[0010] Further, a plurality of fixing pieces are arranged between the plurality of independent MKP windings, the fixing pieces are made of insulating material, the fixing pieces are fixedly connected with the shell, the fixing pieces include upper fixing pieces and lower fixing pieces, the upper fixing pieces and the lower fixing pieces are provided with threading holes, and the metal wires pass through the threading holes to sequentially connect the plurality of independent MKP windings.

[0011] The plurality of independent MKP windings and the shell are filled with insulating material.

[0012] Further, the cavity is filled with inert insulating material gas.

[0013] Further, the MKP capacitor winding includes a conductive layer composed of a metalized polypropylene film, edges of the conductive layer are corrugated, and thicknesses of the edges of the conductive layer are greater than thicknesses of other parts of the conductive layer.

[0014] The MKP capacitor winding further includes a hollow shaft, and the conductive layer is wound on the hollow shaft.

[0015] Further, a grounding bolt is formed at a bottom end of the shell.

[0016] Further, the explosion-proof capacitor further includes a wiring assembly, the wiring assembly is arranged at a top end of the explosion-proof capacitor and is fixedly connected with the terminal, and the wiring assembly includes an insulating base, a wire fixing screw rod fixedly connected with the insulating base, a wire fixing nut sleeved on the wire fixing screw rod, and a flat washer.

[0017] Compared with the prior art, the application has the following beneficial technical effects:

[0018] By using a plurality of independent MKP windings instead of a traditional capacitor core, the internal structure of the capacitor is simplified, and the breaking point on the metal wire is designed, so that the current is cut off in time when the capacitor fails and is about to explode, thereby effectively preventing explosion accidents and improving the safety performance of the capacitor. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 : the overall structure of the explosion-proof capacitor of the application;

[0020] Figure 2 : the structure of the fixing piece of the explosion-proof capacitor of the application;

[0021] Figure 3 MKP winding structure diagram of the explosion-proof capacitor of the present application;

[0022] Figure 4 Wiring assembly structure diagram of the explosion-proof capacitor of the present application; DETAILED DESCRIPTION

[0023] The following examples further illustrate the content of the present application, but should not be understood as limiting the present application. Modifications or replacements of the method, steps or conditions of the present application, without departing from the spirit and essence of the present application, all belong to the scope of the present application. An explosion-proof capacitor comprises:

[0024] A cylindrical aluminum metal shell 1 forms a cavity 101 inside the shell, and a shell pressing edge 102 is formed on the shell and recessed into the cavity;

[0025] A plurality of independent MKP windings 2 are fixedly installed in the cavity 101;

[0026] By setting multiple independent windings, multiple protection can be achieved inside the capacitor, reducing the risk of single point failure. When a fault occurs in one of the windings, due to the independence of the windings, the fault point can be effectively isolated to prevent the fault from spreading to the entire capacitor, thereby improving the overall safety and reliability. In addition, gaps are provided between the independent windings, which help to reduce the accumulation of heat inside the capacitor and avoid performance degradation or damage due to excessive temperature. The aluminum material used for the shell has good heat dissipation performance, which helps to quickly dissipate the heat generated inside, further ensuring the stable operation of the capacitor.

[0027] Metal wires 3 connect the plurality of independent MKP windings 2 and extend to the outside of the shell to form a wiring terminal 301, the metal wires 3 are in a taut state in the cavity, and at least one breaking point 302 is provided on the metal wires 301.

[0028] The breaking point on the metal wire refers to a weak link pre-set on the metal wire 301, when an abnormally high voltage or current occurs inside the capacitor, these breaking points will first break under tension, thereby cutting off the current and preventing further damage inside the capacitor.

[0029] The explosion-proof principle of the explosion-proof capacitor of the present application is as follows: when the internal pressure in the cavity in the cylindrical aluminum metal shell abnormally rises, the shell pressing edge 102 that is concave inward will expand outward under the action of the internal pressure, thus stretching the length of the cylindrical aluminum metal shell, since the metal wires are in a tight state in the cavity, the wire terminals of the metal wires are fixed on the shell, and the metal wires will also be stretched along with the shell, thus causing the metal wires at the breaking point 302 to break, achieving the cutting off of the circuit in the capacitor and preventing the explosion caused by the further expansion of the gas in the capacitor. The overall rupture of the shell is prevented, thus achieving the purpose of explosion-proof.

[0030] In some embodiments, as shown in FIG. 2, a plurality of independent MKP windings 2 are provided with fixing sheets 103 made of insulating materials such as polyimide film. The fixing sheets 103 are fixedly connected with the shell 1, and the fixing sheets 103 include upper fixing sheets 1031 and lower fixing sheets 1032, which are provided with threading holes, through which the metal wires are connected with the plurality of independent MKP windings in sequence. Figure 2

[0031] The function of the fixing sheets 103 is to ensure that the windings 2 maintain appropriate spacing and provide additional mechanical support to prevent displacement or deformation of the windings during transportation or use. In addition, the insulating properties of the fixing sheets 103 can prevent short circuits between the windings, thus improving the electrical performance and safety of the capacitor. The fixing sheets and the metal shell are fixed by gluing or bonding, ensuring that there is no relative displacement between the fixing sheets and the shell in high or low temperature environments, thus ensuring the stability and reliability of the capacitor. In some specific embodiments, the threading holes of the fixing sheets 103 are designed to be non-circular, such as oval or rectangular, which can further limit the movement range of the metal wires in the holes and reduce the wear of the wires caused by vibration or impact. In addition, the edges of the fixing sheets 103 can be designed with smooth transitions to avoid stress concentration when the wires pass through, thus reducing the risk of wire breakage.

[0032] In some embodiments, the plurality of independent MKP windings and the shell are filled with insulating materials.

[0033] ​This insulating material can be epoxy resin or other materials with high insulating properties, and its function is to isolate the windings from the casing. After filling with insulating material, the capacitor can also effectively absorb internal vibrations and shocks, extending the capacitor's service life. In addition, the filling with insulating material also helps maintain the stability of the capacitor's internal temperature, avoiding performance degradation caused by excessive temperature fluctuations. In terms of design, the filling method and amount of insulating material can be optimized according to the specific application and operating environment of the capacitor to achieve the best electrical and mechanical performance.

[0034] In some embodiments, the cavity is filled with an inert insulating gas. The inert insulating gas can be nitrogen or other inert gases, and its function is to further improve the insulation performance inside the capacitor and reduce arcing and sparking that may occur during operation. The use of inert gas can effectively reduce oxidation reactions inside the capacitor, thereby extending its service life. Furthermore, filling with inert gas helps to create a stable environment inside the capacitor, reducing performance fluctuations caused by environmental changes. In certain specific applications, such as in flammable and explosive environments, filling with inert gas is of great significance for improving the safety of the capacitor. In terms of design, the type and amount of inert gas can be adjusted according to the specific requirements of the capacitor and the operating environment to ensure the stability and reliability of the capacitor under various conditions.

[0035] In some embodiments, such as Figure 3 As shown, the MKP capacitor winding 2 includes a conductive layer 201 composed of a metallized polypropylene film. The edge of the conductive layer is corrugated, and the thickness of the edge of the conductive layer is greater than the thickness of the other parts of the conductive layer.

[0036] Metallized polypropylene film refers to coating a polypropylene film with metal to form an extremely thin metal layer. This metallization process not only improves the film's conductivity but also allows for self-healing mechanisms to repair minor defects in the event of a capacitor failure, thereby enhancing the capacitor's reliability and safety. The corrugated edge design of the conductive layer increases the capacitor's voltage withstand capability by dispersing the electric field intensity and reducing partial discharge by increasing the discharge path length. Furthermore, the increased edge thickness provides additional protection against overvoltage surges, preventing the generation and propagation of electric arcs. This design allows MKP capacitor windings to maintain high capacitance while also possessing excellent durability and stability. The capacitor employs thick-edge reinforcement technology to improve the reliable connection between the metal layer and the metal conductors. The polypropylene film uses a combination of corrugated and smooth cutting methods to maximize the effective surface area between the polypropylene film and the metal coating, improving surge current suppression capabilities.

[0037] The metalized polypropylene film is wound on the hollow shaft 202, and the material of the hollow shaft 202 is usually selected to have high mechanical strength and good insulation performance, such as polyester or polypropylene. This design can ensure that the hollow shaft can withstand the internal pressure and temperature changes generated during the operation of the capacitor, while maintaining good insulation performance, avoiding short circuit and leakage phenomena. The diameter and length of the hollow shaft are selected according to the capacity of the capacitor and the application requirements to ensure that the capacitor has sufficient capacitance value and good heat management capability.

[0038] In some embodiments, the explosion-proof capacitor further comprises a wiring assembly 4, which is fixedly connected to the wiring terminal 301 at the top end of the explosion-proof capacitor. The wiring assembly comprises an insulating base 401, a wire fixing screw 402 fixedly connected to the insulating base, and a wire fixing nut 403 and a flat gasket sleeved on the wire fixing screw.

[0039] In use, the wire is wound around the wire fixing screw 402, and then the wire fixing nut 403 is tightened to apply pressure to the wire through the flat gasket, ensuring good contact and fixation between the wire and the wire fixing screw 402. The design of the insulating base 401 can effectively isolate the current and prevent the current from flowing through unintended paths, thereby improving the safety performance of the entire capacitor. In addition, the material of the insulating base 401 needs to have good insulation performance and high temperature resistance to adapt to the high temperature environment that may be generated during the operation of the capacitor. The structural design of the wiring assembly 4 not only ensures the stability of the wiring, but also facilitates the maintenance and replacement of the wire, improving the convenience and reliability of the capacitor.

[0040] Although the utility model has been described in detail above with general description, specific implementation and experiments, some modifications or improvements can be made on the basis of the utility model, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the utility model belong to the scope of protection required by the utility model.

Claims

1. An explosion-proof capacitor, characterized by comprising: The explosion-proof capacitor comprises: a cylindrical aluminum metal shell (1), wherein a cavity (101) is formed inside the shell (1), and a shell pressing edge (102) is formed on the shell (1) and recessed into the cavity (101); a plurality of independent MKP windings (2), wherein the plurality of independent MKP windings (2) are fixedly installed in the cavity (101); metal wires (3), wherein the metal wires (3) are connected to the plurality of independent MKP windings (2) and extend to the outside of the shell (1) to form a terminal (301), the metal wires (3) are in a taut state in the cavity, and at least one breaking point (302) is arranged on the metal wires (3).

2. The explosion-proof capacitor of claim 1, wherein A fixing sheet (103) is arranged between the plurality of independent MKP windings (2), the fixing sheet (103) is made of an insulating material, the fixing sheet (103) is fixedly connected to the shell (1), the fixing sheet (103) comprises an upper fixing sheet (1031) and a lower fixing sheet (1032), the upper fixing sheet (1031) and the lower fixing sheet (1032) are provided with wire holes, and the metal wires pass through the wire holes and are sequentially connected to the plurality of independent MKP windings.

3. The explosion-proof capacitor of claim 1, wherein An insulating material is filled between the plurality of independent MKP windings (2) and the shell (1).

4. The explosion-proof capacitor of claim 1, wherein An inert insulating material gas is injected into the cavity (101).

5. The explosion-proof capacitor of claim 1, wherein The plurality of independent MKP windings (2) comprise a conductive layer (201) composed of a metalized polypropylene film, the edges of the conductive layer (201) are corrugated, and the edge thickness of the conductive layer (201) is greater than the thickness of other parts of the conductive layer.

6. The explosion-proof capacitor of claim 5, wherein The plurality of independent MKP windings (2) further comprise a hollow shaft (202), and the conductive layer is wound on the hollow shaft (202).

7. The explosion-proof capacitor of claim 1, wherein A grounding bolt is formed at the bottom end of the shell.

8. The explosion-proof capacitor of claim 1, wherein The explosion-proof capacitor further comprises a wiring assembly (4), the wiring assembly (4) is arranged at the top end of the explosion-proof capacitor and is fixedly connected to the terminal (301), and the wiring assembly (4) comprises an insulating base (401), a wire fixing screw (402) fixedly connected to the insulating base (401), a wire fixing nut (403) and a flat washer sleeved on the wire fixing screw (402).

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