Long-life low-voltage parallel capacitor

Abstract

The utility model relates to the field of low-voltage parallel capacitors, and discloses a long-service-life low-voltage parallel capacitor which comprises a shell, an upper cover is fixed to the upper end of the shell, a capacitor element is installed in the shell, the long-service-life low-voltage parallel capacitor further comprises a wiring mechanism, the wiring mechanism comprises a wiring seat, and the wiring seat is installed at the top of the upper cover; a wiring terminal and a discharging resistor are installed in the wiring seat, one end of the discharging resistor is electrically connected with the wiring terminal, the other end of the discharging resistor is electrically connected with the capacitor element, the discharging resistor and the wiring terminal are both located outside the shell, and a large amount of heat generated in the operation process of the discharging resistor is directly dissipated to the outside. The temperature rise generated in the operation process of the capacitor is reduced, so that the temperature rise is prevented from gathering in the shell to accelerate the aging of capacitor elements in the shell, and the service life of the capacitor is greatly prolonged.

Description

TECHNICAL FIELD

[0001] The application relates to the field of low-voltage shunt capacitors, in particular to a long-service-life low-voltage shunt capacitor. BACKGROUND

[0002] In a power system, as a key device for reactive power compensation, the stability and reliability of a low-voltage shunt power capacitor directly relate to the power quality, power factor and economic operation of the power grid.

[0003] During the working process of the low-voltage shunt capacitor, when the low-voltage shunt capacitor is disconnected from the circuit, residual charges are still left in the low-voltage shunt capacitor, so the external wire end of the low-voltage shunt capacitor is still electrified. Since the self-discharge process is very slow, the capacitor is electrified for a long time. Therefore, in the prior art, a discharge resistor is often connected to one end of the capacitor, and the discharge resistor can automatically and quickly discharge after the capacitor is disconnected from the circuit.

[0004] However, in actual use, the resistance value of the discharge resistor is large, and in the case that the capacitor capacity is large or the discharge is frequent, the discharge resistor generates a large amount of heat during the working process, thereby increasing the temperature rise in the capacitor. The temperature rise gathered in the shell interior accelerates the aging of the electrical elements in the shell interior, affecting the service life of the capacitor. CONTENT OF THE INVENTION

[0005] In order to avoid the increase of the temperature rise in the capacitor caused by the discharge resistor, a long-service-life low-voltage shunt capacitor is provided.

[0006] The above application purpose of the application is achieved by the following technical scheme:

[0007] The long-service-life low-voltage shunt capacitor comprises a shell, an upper end of the shell is fixed with an upper cover, a capacitor element is installed in the shell, and a wiring mechanism is further included. The wiring mechanism comprises a wiring seat, the wiring seat is installed on the top of the upper cover, a wiring terminal and a discharge resistor are installed in the wiring seat, one end of the discharge resistor is electrically connected with the wiring terminal, and the other end of the discharge resistor is electrically connected with the capacitor element.

[0008] By adopting the above technical scheme, the discharge resistor and the wiring terminal are both located outside the shell, and a large amount of heat generated by the discharge resistor during the operation process is directly dissipated to the outside, thereby reducing the temperature rise generated by the capacitor during the operation process, and avoiding the temperature rise gathered in the shell interior to accelerate the aging of the capacitor element in the shell interior, so that the service life of the capacitor is greatly prolonged.

[0009] Optionally, a limiting groove is formed on the top of the upper cover, a plurality of buckles are fixed on the circumferential sidewall of the bottom of the wiring seat, the bottom of the wiring seat passes through the limiting groove, and the buckles on the circumferential sidewall of the bottom of the wiring seat are clamped with the upper cover.

[0010] By adopting the technical scheme, the buckle design can ensure the close connection between the terminal seat and the capacitor upper cover, effectively prevent the loosening or falling phenomenon caused by external factors such as vibration and impact, and reduce the failure caused by connection problems.

[0011] Optionally, the terminal mechanism comprises a fixing member and a limiting member, one end of the fixing member is fixedly connected with the top of the upper cover, the other end is fixedly connected with the limiting member, the limiting member is located above the upper cover, and the limiting member is perpendicular to the upper cover, the limiting member comprises a limiting part and an adjusting part, the limiting part is clamped with the terminal seat, and the fixing member and the adjusting part form an adjusting cavity.

[0012] By adopting the technical scheme, the limiting part is clamped with the terminal seat, ensuring the close connection between the terminal seat and the upper cover, and the adjusting part is pressed to move in the direction of the adjusting cavity, the adjusting part drives the limiting part to unlock the clamping of the limiting part and the terminal seat, and the limiting part is moved away from the terminal seat, so that the operator can complete the disassembly of the terminal seat by simply operating the limiting member when replacing or repairing the capacitor, greatly improving the work efficiency of the terminal seat disassembly.

[0013] Optionally, the number of the fixing member and the limiting member is multiple, and they are respectively located on the outer side wall of the terminal seat.

[0014] By adopting the technical scheme, the terminal seat is limited from all directions, improving the close connection between the terminal seat and the upper cover of the capacitor, and reducing the risk of movement of the terminal seat on the upper cover.

[0015] Optionally, the distance between the fixing member and the adjusting part is less than the distance between the terminal seat and the adjusting part.

[0016] By adopting the technical scheme, when the terminal seat is inserted towards the upper cover, the risk of contact between the fixing member and the side wall of the terminal seat is reduced, and the insertion of the terminal seat and the upper cover is avoided.

[0017] Optionally, a fixing hole is formed in the outer peripheral side wall of the upper cover, and the terminal mechanism further comprises a limiting column, the limiting column slides in the fixing hole, and in the axial direction, the limiting column abuts against the adjusting part.

[0018] By adopting the technical scheme, since the space occupied by the terminal seat on the upper cover is large, it is inconvenient for the operator to move the limiting part by pressing the adjusting part, therefore, the limiting column is additionally arranged, and the operator can drive the adjusting part to move the limiting part by pressing the limiting column, thereby improving the efficiency of disassembly of the terminal seat and the limiting member.

[0019] Optionally, a spring is installed between the adjusting part and the limiting column.

[0020] By adopting the technical scheme, when the limiting column is pressed to drive the adjusting part to move towards the adjusting cavity, the spring automatically resets the limiting column without manual reset, reduces the additional steps, and improves the efficiency.

[0021] Optionally, the length of the limiting column in the axial direction is greater than the distance from the adjusting part to the outer peripheral sidewall of the upper cover.

[0022] By adopting the technical scheme, the end of the limiting column does not pass through the fixing hole in the pressed state, the fixing hole can limit the limiting column, and when the pressing on the limiting column is released, the spring drives the limiting column to automatically reset in the fixing hole, reducing the risk that the limiting column cannot automatically reset due to abutting against the upper cover.

[0023] Optionally, the number of the terminal is three, and the three terminals are uniformly spaced and parallelly distributed.

[0024] By adopting the technical scheme, the uniformly spaced terminals help to ensure that the electrical performance of each phase of the capacitor is balanced when the capacitor is connected to the circuit, avoiding current imbalance caused by uneven wiring; and the parallelly distributed terminals make the capacitor more convenient to install and maintain.

[0025] In summary, the present application has at least the following beneficial effects:

[0026] 1. A large amount of heat generated by the discharge resistor during operation is directly dissipated to the outside, reducing the temperature rise of the capacitor during operation, thereby avoiding accelerated aging of the capacitor elements inside the capacitor housing, and greatly prolonging the service life of the capacitor.

[0027] 2. The limiting piece limits the terminal seat, ensuring the tight connection between the terminal seat and the upper cover, and the spring is driven by pressing the limiting column to press the adjusting part to move towards the adjusting cavity, and the adjusting part drives the limiting part to unlock the clamping of the limiting part and the terminal seat. When the capacitor needs to be replaced or repaired, the operator only needs to press the limiting column to complete the disassembly and assembly of the terminal seat, greatly improving the work efficiency of the disassembly and assembly of the terminal seat. DETAILED DESCRIPTION

[0028] Figure 1 is a structural schematic view of a high-life low-voltage parallel capacitor embodiment one;

[0029] Figure 2 is a sectional view of a high-life low-voltage parallel capacitor embodiment one;

[0030] Figure 3 is a structural schematic view of a high-life low-voltage parallel capacitor embodiment two;

[0031] Figure 4 This is a cross-sectional view of a second embodiment of a high-life, low-voltage parallel capacitor.

[0032] Reference numerals: 1. Outer shell; 11. Core shaft; 12. Mounting post; 2. Capacitor element; 21. Capacitor core; 22. Metallized film; 23. Insulating paper; 24. Dielectric filling layer; 3. Top cover; 31. Limiting groove; 32. Fixing hole; 4. Wiring mechanism; 41. Terminal block; 411. Buckle; 42. Terminal; 43. Discharge resistor; 44. Fixing component; 441. First fixing plate; 442. Second fixing plate; 45. Limiting component; 451. Limiting part; 452. Adjusting part; 46. Adjusting cavity; 47. Limiting post; 48. Spring; 5. Protector. Detailed implementation method:

[0033] The following section provides a more detailed description, in conjunction with the accompanying diagrams:

[0034] Example 1:

[0035] As attached Figure 1 and attached Figure 2 As shown, a high-life, low-voltage parallel capacitor includes a housing 1, a capacitor element 2, a top cover 3, and a wiring mechanism 4.

[0036] The outer shell 1 is cylindrical in shape, and a spindle 11 coaxial with the outer shell 1 is provided inside the outer shell 1. The spindle 11 is cylindrical in shape, one end of the spindle 11 is fixedly connected to the bottom of the outer shell 1, and the other end extends upward.

[0037] The capacitor element 2 is located inside the housing 1 and on the outer periphery of the spindle 11. The capacitor element 2 includes three capacitor cores 21, which are vertically distributed on the outer periphery of the spindle 11. Three metallized films 22 are installed on the outer periphery of the three capacitor cores 21, and the three metallized films 22 are evenly spaced from each other. The outer side of the three metallized films 22 is covered with insulating paper 23. A dielectric filling layer 24 is provided between the insulating paper 23 and the inner wall of the housing 1. The insulating paper 23 can help the capacitor element 2 dissipate heat better.

[0038] The top cover 3 is located on the top of the outer shell 1. The top cover 3 has a limiting groove 31 that connects the inside of the outer shell 1 with the outside. The top cover 3 is annular in shape, and the outer edge of the top cover 3 is fixedly connected to the upper edge of the outer shell 1.

[0039] A protector 5 is also installed between the top cover 3 and the capacitor element 2. The wiring output terminal of the protector 5 is electrically connected to the capacitor element 2. The protector 5 is a prior art product in this field and will not be described in detail here.

[0040] The wiring mechanism 4 includes a terminal block 41, a terminal block 42, and a discharge resistor 43.

[0041] The wire seat 41 is located on the top of the upper cover 3, the bottom of the wire seat 41 is provided with buckles 411, the number of the buckles 411 is four, and the buckles 411 are fixed on the four side walls of the wire seat 41 respectively, the bottom of the wire seat 41 passes through the limiting groove 31, and the four buckles 411 are clamped with the upper cover 3, so that the tight connection between the wire seat 41 and the upper cover 3 is ensured.

[0042] The wire terminal 42 and the discharge resistor 43 are both installed in the wire seat 41, the number of the wire terminal 42 and the discharge resistor 43 is three, the three wire terminals 42 are uniformly spaced and parallel, one end of the discharge resistor 43 is electrically connected with the wire terminal 42, and the other end is electrically connected with the wire input end of the protector 5.

[0043] The bottom of the shell 1 is provided with a mounting column 12, and the mounting column 12 is provided with a fixing nut, so that the low-voltage parallel capacitor can be fixed.

[0044] The advantage of the embodiment one is that the wire seat 41 with the discharge resistor 43 is installed outside the upper cover 3, a large amount of heat generated by the discharge resistor 43 during operation is directly dissipated to the outside, the temperature rise of the capacitor during operation is reduced, and the accelerated aging of the capacitor element 2 in the shell 1 of the capacitor is avoided.

[0045] Embodiment two:

[0046] As shown in the accompanying drawings Figure 3 and the accompanying drawings Figure 4 , the embodiment two is an improvement on the wire mechanism 4 on the basis of the embodiment one.

[0047] The wire mechanism 4 includes a fixing part 44 and a limiting part 45, the fixing part 44 includes a first fixing plate 441 and a second fixing plate 442, the first fixing plate 441 is fixedly connected with the second fixing plate 442 perpendicularly, the first fixing plate 441 is perpendicular to the upper cover 3, the second fixing plate 442 is parallel to the upper cover 3, the number of the fixing part 44 is two, and the fixing part 44 is located on the two opposite outer side walls of the wire seat 41 respectively.

[0048] The limiting part 45 is in the shape of a long plate, the limiting part 45 is located above the upper cover 3, the limiting part 45 is perpendicular to the upper cover 3, the number of the limiting part 45 is two, and the middle parts of the two limiting parts 45 are fixedly connected with the two second fixing plates 442 respectively, and the limiting part 45 includes a limiting part 451 and an adjusting part 452.

[0049] The adjusting part 452 is fixedly connected with the limiting part 451, the adjusting part 452 is located below, the limiting part 451 is located above, the distance between the adjusting part 452 and the first fixed plate 441 is smaller than the distance between the adjusting part 452 and the wire holder 41, which reduces the risk of contact between the fixing part 44 and the side wall of the wire holder 41, and the adjusting part 452, the first fixed plate 441 and the second fixed plate 442 form an adjusting cavity 46 for the adjusting part 452 to press.

[0050] The end of the limiting part 451 extends towards the wire holder 41, and the two limiting parts 451 are respectively connected with the two opposite outer side walls of the bottom of the wire holder 41.

[0051] The outer peripheral side wall of the upper cover 3 is provided with two fixing holes 32, and the axial directions of the two fixing holes 32 are respectively aligned with the two limiting parts 451.

[0052] The wire connection mechanism 4 further comprises a spring 48 and a limiting column 47.

[0053] The limiting column 47 is in a cylindrical shape, there are two limiting columns 47, the two limiting columns 47 are respectively slid in the two fixing holes 32, the outer peripheral side walls of the two limiting columns 47 are respectively in abutment with the slot walls in the two fixing holes 32, and the length of the limiting column 47 in the axial direction is greater than the distance from the fixed part to the outer peripheral side wall of the upper cover 3.

[0054] One end of the spring 48 is fixedly connected with the limiting column 47, and the other end is fixedly connected with the adjusting part 452, when the limiting column 47 is pressed to drive the adjusting part 452 to move towards the direction of the adjusting cavity 46, and then the pressing on the limiting column 47 is released, the stretching force of the spring 48 will drive the limiting column 47 to automatically reset in the fixing hole 32.

[0055] The advantage of the second embodiment is that the two limiting parts 45 limit the wire holder 41, the limiting column 47 is pressed to extrude the spring 48 to drive the adjusting part 452 to move towards the direction of the adjusting cavity 46, the adjusting part 452 will unlock the abutment between the limiting part 451 and the wire holder 41, when the capacitor needs to be replaced or repaired, the operator only needs to press the limiting column 47 to complete the disassembly of the wire holder 41; after the pressing on the limiting column 47 is released, the stretching force of the spring 48 will drive the limiting column 47 to automatically reset in the fixing hole 32, which can complete the fixation of the wire holder 41, and greatly improves the working efficiency of the disassembly and assembly of the wire holder 41.

[0056] In summary: the wire holder 41 with the discharge resistor 43 is externally provided, which can avoid the heat generated by the discharge resistor 43 from accelerating the aging of the capacitor element 2 inside the shell 1; the limiting part 45 can ensure the close connection between the wire holder 41 and the upper cover 3, and the structure of the limiting column 47 and the spring 48 can quickly realize the disassembly and assembly of the wire holder 41, which improves the working efficiency of the disassembly and assembly of the wire holder 41.

[0057] The embodiments are only illustrative of the present application, and are not intended to limit the present application. Those skilled in the art can make modifications to the embodiments according to the present application without creative contribution, and the modifications are protected by the patent law as long as they are within the scope of the present application.

Claims

1. A long-life low-voltage shunt capacitor comprising a housing (1), an upper end of the housing (1) being fixed with an upper cover (3), a capacitor element (2) being installed in the housing (1), characterized in that, The connecting mechanism (4) comprises a connecting seat (41) installed on the top of the upper cover (3), a connecting terminal (42) and a discharge resistor (43) are installed in the connecting seat (41), one end of the discharge resistor (43) is electrically connected with the connecting terminal (42), and the other end is electrically connected with the capacitor element (2).

2. A long life low voltage parallel capacitor according to claim 1, wherein A limiting slot (31) is formed on the top of the upper cover (3), a plurality of buckles (411) are fixed on the side wall around the bottom of the connecting seat (41), the bottom of the connecting seat (41) passes through the limiting slot (31), and the buckles (411) on the side wall around the bottom are clamped with the upper cover (3).

3. A long life low voltage parallel capacitor according to claim 1, wherein The connecting mechanism (4) comprises a fixing piece (44) and a limiting piece (45), one end of the fixing piece (44) is fixedly connected with the top of the upper cover (3), the other end is fixedly connected with the limiting piece (45), the limiting piece (45) is located above the upper cover (3) and is perpendicular to the upper cover (3), the limiting piece (45) comprises a limiting portion (451) and an adjusting portion (452), the limiting portion (451) is clamped with the connecting seat (41), and the fixing piece (44) and the adjusting portion (452) form an adjusting cavity (46).

4. A long life low voltage parallel capacitor according to claim 3, wherein The number of the fixing piece (44) and the limiting piece (45) is multiple, and they are respectively located on the outer side wall of the connecting seat (41).

5. A long life low voltage parallel capacitor as claimed in claim 3, wherein, The distance between the fixing piece (44) and the adjusting portion (452) is smaller than the distance between the connecting seat (41) and the adjusting portion (452).

6. A long life low voltage parallel capacitor according to claim 3, wherein A fixing hole (32) is formed on the outer side wall of the upper cover (3), the connecting mechanism (4) further comprises a limiting column (47), the limiting column (47) slides in the fixing hole (32) and abuts against the adjusting portion (452) in the axial direction.

7. A long life low voltage parallel capacitor according to claim 6, wherein A spring (48) is installed between the adjusting portion (452) and the limiting column (47).

8. A long life low voltage parallel capacitor according to claim 7, wherein The length of the limiting column (47) in the axial direction is greater than the distance from the adjusting portion (452) to the outer side wall of the upper cover (3).

9. The long life low voltage parallel capacitor of claim 1 wherein, The number of the connecting terminal (42) is three, and the three connecting terminals (42) are uniformly spaced and parallel.

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