Power capacitor

Abstract

The invention is applied to the technical field of capacitors, and discloses a power capacitor which comprises a base, a shell is arranged on the upper surface of the base, a core bag is arranged in the shell, the upper end of the core bag penetrates through the upper surface of the shell and is fixedly provided with a terminal, and an emergency cooling mechanism is arranged in the shell. And when the capacitor is overheated, the capacitor is rapidly and emergently cooled in an automatic triggering manner, so that the capacitor is prevented from being overheated and burnt. According to the power capacitor, when the capacitor is overheated, ammonium salt in the filling cavity is mixed with water in the storage plate to absorb heat of the surrounding environment, so that the effect of reducing the temperature is achieved, and the heat is conducted into the pressure cavity through the heat conduction rod to enable gas to expand; the expanded gas can enable the overflow hole to be aligned with the end part conduction hole and enable the central conduction hole to be aligned with the upper end of the overflow pipe in a manner of pushing the piston rod to slide, so that water can be automatically discharged to realize mixed reaction with ammonium salt.

Description

Technical Field

[0001] The present invention relates to the technical field of capacitors, in particular to a power capacitor. Background Art

[0002] Power capacitors play an extremely important role in power systems. For example, they are used for power factor compensation, filtering and other functions to improve the stability and efficiency of power systems. However, during the operation of power capacitors, they face a serious problem, namely overheating. When power capacitors are running for a long time or under special working conditions such as high load, a large amount of heat will be generated inside them. If the heat cannot be dissipated in time and effectively, the accumulation of heat will cause the temperature inside the capacitor to rise sharply. Excessive temperature will cause serious damage to key components such as the core package of the capacitor, such as accelerating the aging of the insulation material and reducing its insulation performance, thereby increasing the risk of breakdown failure, and eventually may cause the capacitor to overheat and burn. This failure will not only damage the capacitor itself, but also make it impossible to properly Normal operation may also cause local failures in the power system, affecting the stability and reliability of the power supply, bringing many inconveniences to industrial production and residents' lives, and may even cause significant economic losses. The traditional heat dissipation methods of power capacitors are often relatively simple, mainly relying on natural heat dissipation or simple heat sink structures. Their heat dissipation efficiency is limited, and it is difficult to meet the demand for rapid cooling of capacitors under some complex working conditions. Especially when abnormal conditions such as sudden overloads cause a large amount of heat to be generated instantly, traditional heat dissipation methods cannot respond in time and effectively reduce the temperature. At the same time, when the capacitor is in a special state, such as when the internal pressure changes due to changes in the cooling medium, once an erroneous operation occurs, the base will be removed before the pressure relief is completed, causing a dangerous situation. Summary of the Invention

[0003] The object of the present invention is to provide a power capacitor to solve the problem that the cooling method proposed in the above background technology cannot meet the working conditions of rapid temperature increase in a short period of time and that removing the base before pressure relief is completed may easily cause dangerous situations.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a power capacitor comprising a base, an outer shell provided on the upper surface of the base, a core package provided inside the outer shell, and a terminal fixedly mounted on the upper end of the core package passing through the upper surface of the outer shell, and an emergency cooling mechanism provided inside the outer shell, which automatically triggers the capacitor to quickly and urgently cool the capacitor when it overheats, thereby preventing the capacitor from overheating and burning;

[0005] The emergency cooling mechanism includes a filling cavity, which is opened inside the side surface of the shell, and a storage plate is placed inside the filling cavity, and a pressure cavity is opened inside the side surface of the shell, and one end of the heat-conducting rod is fixedly connected to the inner side surface of the filling cavity, and overflow holes are opened on the upper surfaces of both ends of the heat-conducting rod, and an overflow pipe is fixedly set on the lower surface of the middle section of the heat-conducting rod, a sliding piston rod is installed inside the heat-conducting rod, and end conduction holes are opened on the upper surfaces of both ends of the piston rod, and a center conduction hole is opened on the lower surface of the middle section of the piston rod, and a balance pipe is opened inside the side surface of the shell facing the heat-conducting rod, and the balance pipe The upper end of the channel passes through the upper surface of the shell, and a pressure pipe is fixedly provided on the upper end of the shell, and the upper end of the pressure pipe passes through the upper surface of the shell, and the lower end of the pressure pipe passes through the filling cavity and the outer surface of the storage plate, and the pressure pipe is located on the outer surface of the storage plate and has an injection hole, and a pressure cylinder is fixedly provided on the upper surface of the shell, and a sliding piston plate is provided inside the pressure cylinder, a pressure cover is installed on the upper end of the pressure cylinder, and a sliding extrusion plate is installed on the inner surface of the lower end of the pressure cover, the outer surface of the middle section of the pressure cylinder is connected to the upper end of the pressure relief pipe, and the lower end of the pressure relief pipe passes through the inner top surface of the filling cavity.

[0006] Preferably, the storage plate is designed to be continuous in a Z-shape, and the interior of the storage plate is designed to be hollow, and the hollow parts of the upper and lower adjacent storage plates are not connected to each other.

[0007] By adopting the above technical solution, the hollow and non-connected design allows the cooling medium to be stored and acted independently in each storage plate.

[0008] Preferably, the heat-conducting rod and the piston rod are connected by sliding friction, and a spring is connected between the piston rod and the inner surface of the pressure chamber, the overflow hole and the end conduction hole are staggered, the center conduction hole and the upper end of the overflow pipe are staggered, and the lower end of the overflow pipe is located at the lower end of the hollow part of the storage plate, and the end of the heat-conducting rod facing the balance pipe is connected to the balance pipe.

[0009] By adopting the above technical solution, at normal temperature, the staggered setting is used to prevent leakage of the cooling medium. When the temperature rises, the heat conducting rod expands and pushes the piston rod to move so that the holes are gradually aligned to realize the conduction and flow of the cooling medium.

[0010] Preferably, the pressure cylinder and the piston plate are connected by sliding friction, and the outer surface of the piston plate is in contact with the upper end of the pressure relief pipe. A hole is provided at the upper end of the pressure cover, and a spring is connected between the pressure cover and the extrusion plate, and the lower surface of the extrusion plate is in contact with the upper end of the piston plate.

[0011] By adopting the above technical solution, the piston plate is pushed by the extrusion plate under the action of the spring in the pressure cover, so that the pressure cylinder can be pressurized when needed.

[0012] Preferably, a pressure anti-disassembly mechanism is provided at the connection between the base and the shell, which prevents the base from being disassembled before pressure relief is completed by locking the connection between the base and the shell when the pressure inside the filling chamber is high.

[0013] The above technical solution can prevent safety accidents caused by removing the base when there is still high-pressure cooling medium inside the capacitor, thereby ensuring the safety of equipment and personnel.

[0014] Preferably, the pressure anti-disassembly mechanism includes: a locking bolt, the upper end of the locking bolt passes through the upper surface of the base, and the upper end of the locking bolt is threadedly connected to the lower end of the shell, the lower end of the shell is provided with a detection cavity, and the end of the shell facing the base is provided with a connecting pipe, a sliding detection plate is installed inside the detection cavity, and a locking column is fixedly provided at the lower end of the detection plate, and a locking groove is provided inside the upper end of the locking bolt.

[0015] By adopting the above technical solution, the pressure of the filling chamber is transmitted to the detection chamber through a connecting pipe, so that the detection plate drives the locking column and the locking groove of the locking bolt to cooperate or separate according to the pressure change, thereby realizing the locking and unlocking of the connection between the base and the shell.

[0016] Preferably, the detection cavity and the detection plate are connected by sliding friction, and a spring is connected between the detection plate and the detection cavity.

[0017] By adopting the above technical solution, the detection plate has stable sliding and reset functions when the pressure changes. The spring can return the detection plate to its original position after the pressure disappears, which is convenient for next use and equipment maintenance.

[0018] Preferably, the upper end of the communicating tube passes through the inner surface of the upper end of the detection cavity, and the lower end of the communicating tube is connected to the filling cavity, and one end of the communicating tube passing through the detection cavity is located above the detection plate.

[0019] The above technical solution ensures that the pressure of the filling cavity can accurately act on the detection plate, so that the detection plate can accurately perform corresponding locking or unlocking actions according to the pressure change.

[0020] Preferably, the detection plate and the locking column are concentrically designed, and the cross section of the locking column is hexagonal.

[0021] The above technical solution ensures that the locking column can accurately cooperate with the locking groove when driven by the detection plate. The hexagonal design can enhance the stability of the lock and prevent loosening and misoperation.

[0022] Preferably, the locking groove is arranged opposite to the locking column, and the cross section of the locking groove is hexagonal in design.

[0023] By adopting the above technical solution, the locking column and the locking groove can be perfectly matched to achieve a reliable locking function.

[0024] Compared with the prior art, the present invention has the following beneficial effects: the power capacitor:

[0025] 1. When the capacitor is overheated, the ammonium salt in the filling cavity is mixed with the water in the storage plate. When the ammonium salt dissolves in water, an endothermic reaction occurs, absorbing the heat from the surrounding environment, thereby achieving the effect of lowering the temperature. The heat generated by the core package can be quickly absorbed, achieving a more rapid and efficient heat dissipation effect.

[0026] Furthermore, the heat is conducted to the pressure chamber by the heat conducting rod, causing the gas to expand. The expanded gas can push the piston rod to slide, aligning the overflow hole with the end conduction hole and aligning the center conduction hole with the upper end of the overflow pipe. As a result, the water stored in the storage plate can be automatically discharged when the core pack is overheated to achieve a mixing reaction with the ammonium salt.

[0027] Furthermore, by pre-screwing the pressure cap into the pressure cylinder to apply pre-pressure to the piston plate, when the core package is overheated, the water inside the storage plate can be pressed out by the pre-applied pressure, thereby achieving the purpose of mixing water and ammonium salt;

[0028] 2. When the pressure inside the filling chamber increases, the pressure is transmitted to the inside of the detection chamber through the connecting pipe. When the pressure inside the filling chamber is high, the locking bolt will be limited by the sliding locking column and cannot be rotated, thereby avoiding the dangerous situation caused by disassembling the base before the pressure is completely released. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the three-dimensional structure of the connection between the base and the shell of the present invention;

[0031] Figure 3 This is a schematic diagram of the three-dimensional structure of the connection section of the base, shell and core package of the present invention;

[0032] Figure 4 This is a schematic diagram of the three-dimensional structure of the connection section of the detection cavity, the detection plate and the locking column of the present invention;

[0033] Figure 5 This is a schematic diagram of the three-dimensional structure of the cross-section surface connecting the housing and the storage plate of the present invention;

[0034] Figure 6 This is a schematic diagram of the three-dimensional structure of the cross-section connecting the housing and the pressure chamber of the present invention;

[0035] Figure 7 This is a schematic diagram of the three-dimensional structure of the connection section of the pressure cylinder, piston plate and pressure cover of the present invention;

[0036] Figure 8 It is a schematic diagram of the three-dimensional structure of the cross-section of the connection between the heat-conducting rod and the piston rod of the present invention.

[0037] In the figure: 1. Base; 2. Shell; 3. Core package; 4. Terminal; 5. Filling chamber; 6. Storage plate; 7. Pressure chamber; 8. Heat conduction rod; 9. Overflow hole; 10. Overflow pipe; 11. Piston rod; 12. End conduction hole; 13. Center conduction hole; 14. Balance pipe; 15. Pressurized pipe; 16. Injection hole; 17. Pressurized cylinder; 18. Piston plate; 19. Pressurized cover; 20. Extrusion plate; 21. Pressure relief pipe; 22. Locking bolt; 23. Detection chamber; 24. Connecting pipe; 25. Detection plate; 26. Locking column; 27. Locking groove. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] See also Figures 1-8 , the present invention provides a technical solution: a power capacitor.

[0040] Example 1: This example discloses a base 1, with a housing 2 provided on the upper surface of the base 1, and a core package 3 provided inside the housing 2. The upper end of the core package 3 penetrates the upper surface of the housing 2 and is fixedly mounted with a terminal 4. An emergency cooling mechanism is provided inside the housing 2. When the capacitor overheats, it is automatically triggered to quickly and urgently cool the capacitor to ensure that the capacitor does not overheat and burn.

[0041] The emergency cooling mechanism includes a filling chamber 5, which is opened inside the side surface of the shell 2, and a storage plate 6 is placed inside the filling chamber 5, and a pressure chamber 7 is opened inside the side surface of the shell 2, and one end of a heat-conducting rod 8 is fixedly connected to the inner surface of the filling chamber 5, and overflow holes 9 are opened on the upper surfaces of both ends of the heat-conducting rod 8, and an overflow pipe 10 is fixedly set on the lower surface of the middle section of the heat-conducting rod 8, a sliding piston rod 11 is installed inside the heat-conducting rod 8, and end conduction holes 12 are opened on the upper surfaces of both ends of the piston rod 11, and a center conduction hole 13 is opened on the lower surface of the middle section of the piston rod 11, and a balance pipe 14 is opened inside the side surface of the shell 2 facing the heat-conducting rod 8, and the upper surface of the balance pipe 14 is fixed with an overflow pipe 10, and ... the upper surface of the balance pipe 14 is fixed with an overflow pipe 10, and the upper surface of the balance pipe 14 is fixed with an overflow pipe 10, and the upper surface of the balance pipe 14 is fixed with an overflow pipe 10, and the upper surface of the balance pipe 14 is fixed with an overflow pipe 10, and the upper surface of the balance pipe 14 is fixed with an overflow pipe 10, and the upper surface of the balance pipe 14 is fixed with an overflow pipe 10, The end passes through the upper surface of the shell 2, and a pressure pipe 15 is fixedly provided on the upper end of the shell 2, and the upper end of the pressure pipe 15 passes through the upper surface of the shell 2, and the lower end of the pressure pipe 15 passes through the outer surface of the filling cavity 5 and the storage plate 6, and the pressure pipe 15 is located on the outer surface of the storage plate 6. An injection hole 16 is provided on the outer surface of the storage plate 6, and a pressure cylinder 17 is fixedly provided on the upper surface of the shell 2, and a sliding piston plate 18 is provided inside the pressure cylinder 17. A pressure cover 19 is installed on the upper end of the pressure cylinder 17, and a sliding extrusion plate 20 is installed on the inner surface of the lower end of the pressure cover 19. The outer surface of the middle section of the pressure cylinder 17 is connected to the upper end of the pressure relief pipe 21, and the lower end of the pressure relief pipe 21 passes through the inner top surface of the filling cavity 5;

[0042] The storage plate 6 is designed in a continuous Z-shape, and the interior of the storage plate 6 is designed to be hollow, and the hollow parts of the upper and lower adjacent storage plates 6 are not connected to each other;

[0043] The heat conducting rod 8 and the piston rod 11 are connected by sliding friction, and a spring is connected between the piston rod 11 and the inner surface of the pressure chamber 7. The overflow hole 9 and the end conduction hole 12 are offset. The central conduction hole 13 and the upper end of the overflow pipe 10 are offset. The lower end of the overflow pipe 10 is located at the lower end of the hollow portion of the storage plate 6. The end of the heat conducting rod 8 facing the balance pipe 14 is connected to the balance pipe 14.

[0044] The pressure cylinder 17 and the piston plate 18 are connected by sliding friction, and the outer surface of the piston plate 18 is in contact with the upper end of the pressure relief pipe 21. A hole is opened at the upper end of the pressure cover 19, and a spring is connected between the pressure cover 19 and the extrusion plate 20, and the lower surface of the extrusion plate 20 is in contact with the upper end of the piston plate 18.

[0045] During normal use, first inject sufficient water into the storage plate 6, then put sufficient ammonium salt into the filling cavity 5, and then fix the base 1 and the shell 2 with the terminal 4 facing upward for easy use. When the temperature of the capacitor rises sharply during use, the temperature generated by the core package 3 is transferred to the inside of the pressure chamber 7 through the heat-conducting rod 8. At this time, the air inside the pressure chamber 7 expands and pushes the piston rod 11 inside the heat-conducting rod 8. When the piston rod 11 slides into place and cannot slide further, the overflow hole 9 is facing the end conduction hole 12 and the center conduction hole 13 is facing the overflow pipe 10. At this time, the pressure inside the pressure cover 19 The extrusion plate 20 slides under the support of the spring, driving the piston plate 18 downward. The piston plate 18 descends, injecting the air in the pressurizing cylinder 17 downward through the pressurizing pipe 15 and the injection hole 16 into different storage plates 6. At this time, the pressure in the storage plate 6 increases, causing the water at the lower end of the storage plate 6 to overflow upward through the overflow pipe 10, and finally overflow into the filling chamber 5 through the overlapping overflow hole 9 and the end conduction hole 12 to react with the ammonium salt to produce an endothermic reaction, thereby achieving rapid absorption of the heat generated by the core package 3. During the sliding process of the piston rod 11, the balancing pipe 14 plays a role in balancing the pressure inside the heat-conducting rod 8;

[0046] After the piston plate 18 slides down, the upper end of the pressure relief pipe 21 is released, so that even if a small amount of gas is generated inside the filling chamber 5, it can be gradually decompressed through the pressure relief pipe 21 without explosion.

[0047] Example 2: Based on Example 1, this example discloses that a pressure-preventive disassembly mechanism is provided at the connection between the base 1 and the housing 2. By locking the connection between the base 1 and the housing 2 when the pressure inside the filling chamber 5 is high, it is prevented from being disassembled before the pressure is completely released.

[0048] The pressure anti-tamper mechanism includes: a locking bolt 22, the upper end of which passes through the upper surface of the base 1 and is threadedly connected to the lower end of the housing 2. The lower end of the housing 2 defines a detection chamber 23, and the end of the housing 2 facing the base 1 defines a connecting pipe 24. A sliding detection plate 25 is installed within the detection chamber 23, and a locking column 26 is fixedly provided at the lower end of the detection plate 25. A locking groove 27 is defined within the upper end of the locking bolt 22.

[0049] The detection cavity 23 and the detection plate 25 are connected by sliding friction, and a spring is connected between the detection plate 25 and the detection cavity 23;

[0050] The upper end of the connecting tube 24 passes through the inner surface of the upper end of the detection cavity 23, and the lower end of the connecting tube 24 is connected to the filling cavity 5. One end of the connecting tube 24 passing through the detection cavity 23 is located above the detection plate 25.

[0051] The detection plate 25 and the locking column 26 are concentrically designed, and the cross section of the locking column 26 is a hexagonal design;

[0052] The locking groove 27 is arranged opposite to the locking column 26, and the cross section of the locking groove 27 is a hexagonal design;

[0053] When the pressure inside the filling chamber 5 increases due to the generation of gas and is not relieved in time, the pressure is transmitted to the inside of the detection chamber 23 through the connecting tube 24. The detection chamber 23 pushes the detection plate 25 to slide due to the pressure, and the detection plate 25 drives the locking column 26 to slide downward. When the locking column 26 is inserted into the locking groove 27, the locking bolt 22 cannot be rotated. When the locking column 26 fails to be inserted into the locking groove 27, when the locking bolt 22 is rotated, the locking column 26 continues to slide into the locking groove 27 under the action of pressure, ensuring that when the pressure inside the filling chamber 5 is high, the locking bolt 22 cannot be directly removed to separate the base 1 and the shell 2.

[0054] The above specific embodiments further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A power capacitor, comprising a base (1), wherein the upper surface of the base (1) is provided with a shell (2), and a core package (3) is provided inside the shell (2), and the upper end of the core package (3) penetrates the upper surface of the shell (2) and is fixedly mounted with a terminal (4), characterized in that: An emergency cooling mechanism is provided inside the housing (2), which is automatically triggered to quickly cool the capacitor when the capacitor is overheated, thereby ensuring that the capacitor will not overheat and burn; The emergency cooling mechanism includes a filling chamber (5), the filling chamber (5) is opened inside the side surface of the shell (2), and a storage plate (6) is placed inside the filling chamber (5), and a pressure chamber (7) is opened inside the side surface of the shell (2), one end of a heat-conducting rod (8) is fixedly connected to the inner side surface of the filling chamber (5), and overflow holes (9) are opened on the upper surfaces of both ends of the heat-conducting rod (8), and an overflow pipe (10) is fixedly set on the lower surface of the middle section of the heat-conducting rod (8), a sliding piston rod (11) is installed inside the heat-conducting rod (8), and end conduction holes (12) are opened on the upper surfaces of both ends of the piston rod (11), and a center conduction hole (13) is opened on the lower surface of the middle section of the piston rod (11), and a balance pipe (14) is opened inside the side surface of the shell (2) facing the heat-conducting rod (8), and the upper surface of the balance pipe (14) is fixedly provided with an overflow pipe (10). The end of the pressure pipe (15) passes through the upper surface of the shell (2), the upper end of the shell (2) is fixedly provided with a pressure pipe (15), and the upper end of the pressure pipe (15) passes through the upper surface of the shell (2), and the lower end of the pressure pipe (15) passes through the outer surface of the filling cavity (5) and the storage plate (6), the outer surface of the pressure pipe (15) located inside the storage plate (6) is provided with an injection hole (16), the upper surface of the shell (2) is fixedly provided with a pressure cylinder (17), and the interior of the pressure cylinder (17) is provided with a sliding piston plate (18), the upper end of the pressure cylinder (17) is installed with a pressure cover (19), and the inner surface of the lower end of the pressure cover (19) is installed with a sliding extrusion plate (20), the outer surface of the middle section of the pressure cylinder (17) is connected to the upper end of the pressure relief pipe (21), and the lower end of the pressure relief pipe (21) passes through the inner top surface of the filling cavity (5).

2. A power capacitor according to claim 1, characterized in that: The storage plate (6) is designed to be continuous in a Z-shape, and the interior of the storage plate (6) is designed to be hollow, and the hollow parts of the upper and lower adjacent storage plates (6) are not connected to each other.

3. A power capacitor according to claim 1, characterized in that: The heat-conducting rod (8) and the piston rod (11) are connected by sliding friction, and a spring is connected between the piston rod (11) and the inner surface of the pressure chamber (7). The overflow hole (9) and the end conduction hole (12) are staggered. The central conduction hole (13) and the upper end of the overflow pipe (10) are staggered, and the lower end of the overflow pipe (10) is located at the lower end of the hollow part of the storage plate (6). One end of the heat-conducting rod (8) facing the balance pipe (14) is connected to the balance pipe (14).

4. A power capacitor according to claim 1, characterized in that: The pressurizing cylinder (17) and the piston plate (18) are connected by sliding friction, and the outer surface of the piston plate (18) is in contact with the upper end of the pressure relief pipe (21). A hole is provided at the upper end of the pressurizing cover (19), and a spring is connected between the pressurizing cover (19) and the extrusion plate (20), and the lower surface of the extrusion plate (20) is in contact with the upper end of the piston plate (18).

5. A power capacitor according to claim 1, characterized in that: A pressure anti-disassembly mechanism is provided at the connection between the base (1) and the shell (2), which prevents the base (1) from being disassembled before pressure relief is completed by locking the connection between the base (1) and the shell (2) when the internal pressure of the filling chamber (5) is high.

6. A power capacitor according to claim 5, characterized in that: The pressure anti-disassembly mechanism comprises: a locking bolt (22), the upper end of the locking bolt (22) passes through the upper surface of the base (1), and the upper end of the locking bolt (22) is threadedly connected to the lower end of the shell (2), the lower end of the shell (2) is provided with a detection cavity (23), and the end of the shell (2) facing the base (1) is provided with a connecting pipe (24), a sliding detection plate (25) is installed inside the detection cavity (23), and a locking column (26) is fixedly provided at the lower end of the detection plate (25), and a locking groove (27) is provided inside the upper end of the locking bolt (22).

7. A power capacitor according to claim 6, characterized in that: The detection cavity (23) and the detection plate (25) are connected by sliding friction, and a spring is connected between the detection plate (25) and the detection cavity (23).

8. A power capacitor according to claim 6, characterized in that: The upper end of the connecting tube (24) passes through the inner surface of the upper end of the detection cavity (23), and the lower end of the connecting tube (24) is connected to the filling cavity (5). One end of the connecting tube (24) passing through the detection cavity (23) is located above the detection plate (25).

9. A power capacitor according to claim 6, characterized in that: The detection plate (25) and the locking column (26) are concentrically designed, and the cross section of the locking column (26) is hexagonal.

10. A power capacitor according to claim 6, characterized in that: The locking groove (27) is arranged opposite to the locking column (26), and the cross section of the locking groove (27) is hexagonal in design.

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