Polypropylene film capacitor

Abstract

According to the technical scheme, the polypropylene film capacitor is characterized in that the polypropylene film capacitor comprises a shell, and an end cover is arranged in the shell; the aluminum shell is fixedly mounted on the inner bottom surface of the outer shell; the capacitor roll core is arranged in the aluminum shell and is used for filtering and smoothing a circuit; the installation column is arranged on the inner bottom face of the aluminum shell, a reel is arranged on the top face of the installation column, and the capacitor roll core and the reel are movably arranged together in a sleeved mode; the two lead holes are formed in the top face of the end cover, a cathode piece and an anode piece are fixedly installed in the capacitor roll core, the fastening assemblies are arranged, the arc-shaped clamping blocks are distributed at the upper position, the middle position and the lower position of the clamping rod, the capacitor roll core can be effectively fastened, and the phenomenon that due to the fact that the viscosity of an insulating tape is reduced, the capacitor roll core is damaged is avoided. As a result, the displacement of the internal elements may cause poor contact between the electrodes, which affects the normal operation of the capacitor and even causes faults, thereby improving the electrical performance stability of the capacitor.

Description

Technical Field

[0001] The invention relates to the technical field of capacitors, and in particular to polypropylene film capacitors. Background Art

[0002] Two conductors close to each other with a layer of non-conductive insulating medium in between constitute a capacitor. When a voltage is applied between the two plates of the capacitor, the capacitor will store charge. The capacitance of the capacitor is numerically equal to the ratio of the charge on one conductive plate to the voltage between the two plates. Capacitance is also called "capacitance", which refers to the storage of free charge under a given potential difference, denoted by C, and the international unit is farad. Generally speaking, charges will move due to force in an electric field. When there is a medium between conductors, the movement of charges is hindered and the charges accumulate on the conductors, resulting in the accumulation and storage of charges. The amount of stored charge is called capacitance.

[0003] According to the Chinese patent application number: CN201821550520.X, a filter capacitor is disclosed, including a shell, an end cover is provided on the shell, a terminal is provided on the end cover, a sealing ring is provided between the terminal and the end cover, a filling port is provided on the end cover, an explosion-proof cover is provided inside the end cover, a connecting hole is provided under the explosion-proof cover, a fuse is provided in the connecting hole through the terminal, the fuse is connected to the capacitor core, the outside of the capacitor core is wrapped with electrolytic tape, the shell and the capacitor core are bonded by epoxy resin, the upper end of the inside of the shell is filled with nitrile rubber, the shell is covered with a polypropylene metallized film, and the polypropylene metallized film is coated with moisture-proof paint.

[0004] At present, there are still some shortcomings in a filter capacitor. For example, after the electrodes and polypropylene film are usually wound together in a stacked manner, electrolytic tape is usually used to bind the wound capacitor cores together. However, the capacitor will generate heat during use, and the heat will cause the adhesive on the electrolytic tape to melt and reduce its viscosity, thereby causing internal components to shift, resulting in poor contact between the electrodes, affecting the normal operation of the capacitor, and even causing failures. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a polypropylene film capacitor, which solves the problems mentioned in the background technology.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: Polypropylene film capacitors, including: An outer shell, wherein an end cover is disposed inside the outer shell; An aluminum shell, the aluminum shell is fixedly mounted on the inner bottom surface of the housing; a capacitor winding core is arranged inside the aluminum shell and is used for filtering and smoothing the circuit; A mounting column is arranged on the inner bottom surface of the aluminum shell, a reel is arranged on the top surface of the mounting column, the capacitor reel core and the reel are movably sleeved together, and two limit plates are fixedly installed on the outside of the reel; Two lead holes are opened on the top surface of the end cover, a cathode sheet and an anode sheet are fixedly installed inside the capacitor winding core, one end of the cathode sheet and the anode sheet is fixedly connected with a wire, and the wire passes through the lead holes and extends to the outside; A fastening assembly, which is arranged on both sides of the limit plate and is used to fasten the capacitor core; the outer circular wall surface of the limit plate is provided with two installation openings, a connecting box is fixedly installed on the inner side of the installation opening, a connecting rod is provided on the internal movable sleeve of the connecting box, two tension springs are fixedly installed on the inner side of the connecting box, the tension springs are fixedly connected to the connecting rod, a clamping rod is fixedly installed on one side of every two connecting rods, a plurality of bayonet holes are provided on one side of the clamping rod, and an arc-shaped clamping block is fixedly installed on the inner side of the bayonet hole.

[0007] Preferably, a telescopic rod is fixedly mounted on the top surface of the mounting column, the telescopic rod is movably sleeved with the reel, a limit block is fixedly mounted on the top surface of the telescopic rod, and a first spring is sleeved on the outside of the telescopic rod.

[0008] Preferably, the inner circular wall surface of the reel is provided with two clamping holes, the inner movable sleeve of the clamping hole is provided with a round head clamping block, the outer side of the round head clamping block is provided with a second spring, and the outer circular wall surface of the telescopic rod is provided with two fixing grooves, and the round head clamping block is movably engaged with the fixing groove.

[0009] Preferably, the outer circular wall surface of the end cover is provided with two slots, and the inner circular wall surface of the shell is fixedly provided with two buckles, and the buckles are movably engaged with the slots.

[0010] Preferably, an explosion-proof hole is provided on the top surface of the end cover, and an explosion-proof valve is fixedly installed on the inner circular wall surface of the explosion-proof hole.

[0011] Preferably, a connecting hole is opened on one side of the clamping rod, and a connecting bolt is threadedly connected to the interior of the connecting hole, and the connecting bolt is threadedly connected to the connecting rod.

[0012] Preferably, an insulating pad is fixedly adhered to one side of the arc-shaped clamping block.

[0013] Preferably, epoxy resin is filled between the outer shell and the aluminum shell.

[0014] Preferably, an anti-overflow ring is fixedly mounted on the inner circular wall surface of the shell.

[0015] Preferably, a mounting plate is fixedly mounted on the bottom surface of the housing.

[0016] In summary, the present invention mainly has the following beneficial effects: By setting an arc-shaped clamping block and a fastening component, the capacitor core is placed in an aluminum shell, and the aluminum shell is then wrapped by an outer shell. When in use, it is connected to the equipment to be used through the terminal connector on the wire. When the capacitor core is installed in the aluminum shell, it is sleeved on the reel, and the staff pulls the clamping rods on both sides. At this time, the tension spring is in an expanded state, and the capacitor core is limited by the upper and lower limit plates. After the capacitor core is installed, the clamping rods on both sides are loosened. At this time, the tension spring pulls the connecting rod, driving the clamping rod to move inward, so that the arc-shaped clamping block on the clamping rod moves to both sides of the capacitor core, and the two sides of the capacitor core are tightened to prevent loosening, through the internal tension spring. The clamping width between the clamping rods can be adjusted, which is suitable for capacitor cores of different sizes. The insulating pad on the arc-shaped clamping block plays a certain buffering role to prevent excessive clamping and squeeze damage to the capacitor core. At the same time, it effectively prevents accidental conduction of current between different components inside the capacitor and reduces the possibility of leakage, thereby ensuring the stability of the electrical performance of the capacitor. The arc-shaped clamping blocks are distributed in the upper, middle and lower positions of the clamping rod, which can effectively tighten the capacitor core, avoiding the displacement of internal components due to the decrease in viscosity of the insulating tape, which may cause poor contact between the electrodes, affect the normal operation of the capacitor, and even cause failures, thereby improving the stability of the electrical performance of the capacitor.

[0017] When it is necessary to maintain the inside of the capacitor, the staff squeezes the buckles on both sides to one side. After the buckles are stressed, the card ends stuck in the card slots shrink, so that the card ends of the buckles are separated from the card slots, thereby facilitating the staff to disassemble the end cover. Then the staff can pull the limit plate to pull the reel out of the aluminum shell. At this time, the first spring is in a compressed state, and the capacitor core is pulled out to the outside of the aluminum shell. During the process of the reel being pulled out to the outside of the aluminum shell, the second spring is in a compressed state. When the round-headed block in the bottom end of the reel passes through the fixed groove on the telescopic rod, the second spring bounces and drives the round-headed block to be stuck in the fixed groove, so that the pulled-out limit plate is fixed on the telescopic rod. When the capacitor core on the limit plate is overhauled, there is no need for the staff to continuously pull the limit plate. When the capacitor core is pulled out of the aluminum shell, the staff can remove the connecting bolts on both sides of the clamping rod. After removing the connecting bolts, the upper limit plate can be removed from the reel, thereby facilitating the staff to maintain the capacitor core. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the end cover split structure of the present invention; Figure 3 It is a schematic diagram of the aluminum shell split structure of the present invention; Figure 4 It is a schematic diagram of the mounting column structure of the present invention; Figure 5 Schematic diagram of the limiting plate structure of the present invention Figure 6 This is a schematic diagram of the arc clamping block structure of the present invention. Figure 7 This is a schematic diagram of the cross-sectional structure of the connection box of the present invention. Figure 8 It is a schematic plan view of the scroll of the present invention.

[0019] 1. Casing; 2. End cover; 3. Aluminum shell; 4. Mounting column; 5. Capacitor winding core; 6. Reel; 7. Lead hole; 8. Cathode sheet; 9. Anode sheet; 10. Wire; 11. Limiting plate; 12. Mounting port; 13. Connection box; 14. Connecting rod; 15. Clamping rod; 16. Bayonet; 17. Arc clamping block; 18. Tension spring; 19. Insulating pad; 20. Telescopic rod; 21. Limiting block; 22. First spring; 23. Clamping hole; 24. Fixing groove; 25. Round head clamping block; 26. Second spring; 27. Buckle; 28. Clamping groove; 29. ​​Explosion-proof hole; 30. Explosion-proof valve; 31. Mounting sheet; 32. Epoxy resin; 33. Anti-overflow ring; 34. Connecting hole; 35. Connecting bolt. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0021] refer to Figure 1-Figure 8 , a polypropylene film capacitor, comprising: a shell 1, an end cover 2 is arranged inside the shell 1; Aluminum shell 3, the aluminum shell 3 is fixedly mounted on the inner bottom surface of the housing 1. The aluminum shell 3 is light and corrosion-resistant, and has good electrical conductivity and heat dissipation performance, which helps to dissipate heat and prolong the service life of the capacitor; The capacitor winding core 5 is arranged inside the aluminum shell 3 and is used for filtering and smoothing the circuit; The mounting column 4 is arranged on the inner bottom surface of the aluminum shell 3, and the top surface of the mounting column 4 is provided with a reel 6, the capacitor reel 5 and the reel 6 are movably sleeved together, and two limit plates 11 are fixedly installed on the outside of the reel 6; Two lead holes 7 are opened on the top surface of the end cover 2. A cathode sheet 8 and an anode sheet 9 are fixedly installed inside the capacitor winding core 5. One end of the cathode sheet 8 and the anode sheet 9 is fixedly connected with a wire 10. The wire 10 passes through the lead holes 7 and extends to the outside. A fastening assembly is provided on both sides of the limiting plate 11 and is used to fasten the capacitor winding core 5; the outer circumferential wall surface of the limiting plate 11 is provided with two mounting openings 12, a connecting box 13 is fixedly installed on one side of the mounting opening 12, a connecting rod 14 is provided on the movable sleeve inside the connecting box 13, two tension springs 18 are fixedly installed on one side of the connecting box 13, the tension spring 18 is fixedly connected to the connecting rod 14, a clamping rod 15 is fixedly installed on one side of every two connecting rods 14, a plurality of bayonet openings 16 are provided on one side of the clamping rod 15, and an arc-shaped clamping block 17 is fixedly installed on one side of the bayonet opening 16; By setting a fastening component, the capacitor core 5 is placed in the aluminum shell 3, and the aluminum shell 3 is then wrapped by the outer shell 1. When in use, it is connected to the device to be used through the terminal connector on the wire 10. When the capacitor core 5 is installed in the aluminum shell 3, it is inserted into the reel 6. The staff pulls the clamping rods 14 on both sides. At this time, the tension spring 18 is in an expanded state. The capacitor core 5 is limited by the upper and lower limit plates 11. When the capacitor core 5 is installed, the clamping rods 15 on both sides are loosened. At this time, the tension spring 18 pulls the connecting rod 14, driving the clamping rod 15 to move inward, so that the clamping rod 1 The arc-shaped clamping blocks 17 on 5 are moved to both sides of the capacitor core 5 to tighten both sides of the capacitor core 5 to prevent loosening. The clamping width between the clamping rods 15 can be adjusted through the internal tension spring 18, which is suitable for capacitor cores 5 of different sizes. The arc-shaped clamping blocks 17 are distributed at the upper, middle and lower positions of the clamping rod 15, which can effectively tighten the capacitor core 5, avoiding the displacement of internal components due to the decrease in viscosity of the insulating tape, which may cause poor contact between electrodes, affect the normal operation of the capacitor, and even cause failures, thereby improving the electrical performance stability of the capacitor.

[0022] As a further solution of the present invention, a telescopic rod 20 is fixedly installed on the top surface of the mounting column 4, the telescopic rod 20 is movably sleeved with the reel 6, a limit block 21 is fixedly installed on the top surface of the telescopic rod 20, and a first spring 22 is sleeved on the outside of the telescopic rod 20; By setting the reel 6, when the capacitor is in use, the reel 6 presses the limit block 21 of the telescopic rod 20 through the first spring 22 to ensure the stability of the reel 6 and prevent it from shaking up and down during use, which affects the stability of the capacitor core 5. When the internal capacitor core 5 fails, the staff can remove the end cover 2 and pull the limit plate 11 to pull the reel 6 out of the aluminum shell 3. At this time, the first spring 22 is in a compressed state, so that the capacitor core 5 is pulled out to the outside of the aluminum shell 3, thereby facilitating the maintenance and repair of the capacitor core 5.

[0023] As a further solution of the present invention, the inner circumferential wall surface of the reel 6 is provided with two clamping holes 23, the inner circumferential wall surface of the clamping hole 23 is movably sleeved with a round clamping block 25, the outer circumferential clamping block 25 is provided with a second spring 26, and the outer circumferential wall surface of the telescopic rod 20 is provided with two fixing grooves 24, and the round clamping block 25 is movably engaged with the fixing groove 24; By providing the round-head block 25, when the reel 6 is pulled out to the outside of the aluminum shell 3, the second spring 26 is in a compressed state. When the round-head block 25 in the bottom end of the reel 6 passes through the fixed groove 24 on the telescopic rod 20, the second spring 26 bounces and drives the round-head block 25 to be clamped into the fixed groove 24, so that the pulled-out limit plate 11 is fixed on the telescopic rod 20. When the capacitor core 5 on the limit plate 11 is inspected and repaired, there is no need for the staff to continuously pull the limit plate 11.

[0024] As a further solution of the present invention, the outer circumferential wall surface of the end cover 2 is provided with two slots 28, and the inner circumferential wall surface of the housing 1 is fixedly provided with two buckles 27, and the buckles 27 are movably engaged with the slots 28; By setting the buckle 27, when maintenance is needed inside the capacitor, the staff squeezes the buckles 27 on both sides to one side. After the buckle 27 is subjected to force, the card end stuck in the card slot 28 shrinks, so that the card end of the buckle 27 is separated from the card slot 28, thereby facilitating the staff to disassemble the end cover 2.

[0025] As a further solution of the present invention, an explosion-proof hole 29 is opened on the top surface of the end cover 2, and an explosion-proof valve 30 is fixedly installed on the inner circular wall surface of the explosion-proof hole 29; By setting up the explosion-proof valve 30, during the operation of the capacitor, if the internal gas pressure increases sharply due to overheating, overpressure or internal failure, a pressure relief channel will be provided through the explosion-proof valve 30 to release the internal pressure, thereby preventing the capacitor casing 1 from bursting, and effectively reducing the destructiveness of the explosion.

[0026] As a further solution of the present invention, a connection hole 34 is opened on one side of the clamping rod 15, and a connection bolt 35 is threadedly connected to the inner thread of the connection hole 34, and the connection bolt 35 is threadedly connected to the connection rod 14; By providing the connecting bolts 35, when the capacitor core 5 is pulled out of the aluminum shell 3, the staff can remove the connecting bolts 35 on both sides of the clamping rod 15. After removing the connecting bolts 35, the upper limit plate 11 can be removed from the reel 6, thereby facilitating the staff to maintain the capacitor core 5.

[0027] As a further solution of the present invention, an insulating pad 19 is fixedly adhered to one side of the arc-shaped clamping block 17; By providing the insulating pad 19, when the arc-shaped clamping block 17 clamps and fixes the capacitor core 5, the insulating pad 19 on the arc-shaped clamping block 17 plays a certain buffering role to prevent excessive clamping and squeezing damage to the capacitor core 5. At the same time, it effectively prevents accidental conduction of current between different components inside the capacitor and reduces the possibility of leakage, thereby ensuring the stability of the electrical performance of the capacitor.

[0028] As a further solution of the present invention, epoxy resin 32 is filled between the housing 1 and the aluminum shell 3; By setting the epoxy resin 32, when the aluminum shell 3 is installed in the shell 1, the staff fills the epoxy resin 32 between the shell 1 and the aluminum shell 3. The epoxy resin 32 fixes the position of the aluminum shell 3 to prevent it from being displaced or loosened under mechanical vibration or impact. At the same time, it can effectively block the entry of water and moisture to prevent the internal components of the capacitor from getting damp.

[0029] As a further solution of the present invention, an anti-overflow ring 33 is fixedly installed on the inner circular wall surface of the housing 1; By setting the anti-overflow ring 33, when the outer shell 1 and the aluminum shell 3 are filled with epoxy resin 32, the anti-overflow ring 33 inside the outer shell 1 can prevent the epoxy resin 32 from overflowing into the aluminum shell 3 during the epoxy resin 32 filling process, resulting in the inability to replace the components inside the device during subsequent maintenance.

[0030] As a further solution of the present invention, a mounting piece 31 is fixedly mounted on the bottom surface of the housing 1; By setting the mounting plate 31, when the device is installed, the mounting plate 31 at the bottom of the shell 1 is installed on the mainboard of other devices, and the mounting plate 31 is snapped or inserted into the corresponding position. Since there is no need to align the threads and tighten the bolts, the use of the mounting plate 31 can significantly shorten the installation time and improve work efficiency.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Polypropylene film capacitor, characterized in that, include: A housing (1), wherein an end cover (2) is disposed inside the housing (1); An aluminum shell (3), the aluminum shell (3) being fixedly mounted on the inner bottom surface of the outer shell (1); The capacitor winding core (5) is arranged inside the aluminum shell (3) and is used for filtering and smoothing the circuit; A mounting column (4) is arranged on the inner bottom surface of the aluminum shell (3); a reel (6) is arranged on the top surface of the mounting column (4); the capacitor reel (5) and the reel (6) are movably sleeved together; and two limit plates (11) are fixedly mounted on the outside of the reel (6); Two lead holes (7) are formed on the top surface of the end cover (2); a cathode sheet (8) and an anode sheet (9) are fixedly mounted inside the capacitor winding core (5); one end of the cathode sheet (8) and the anode sheet (9) are fixedly connected to a wire (10); the wire (10) passes through the lead holes (7) and extends to the outside; A fastening assembly, the fastening assembly being arranged on both sides of a limit plate (11) and being used for fastening a capacitor winding core (5); the outer circumferential wall surface of the limit plate (11) is provided with two mounting openings (12); a connecting box (13) is fixedly mounted on one side of the mounting opening (12); a connecting rod (14) is provided in a movable sleeve inside the connecting box (13); two tension springs (18) are fixedly mounted on one side of the connecting box (13); the tension springs (18) are fixedly connected to the connecting rod (14); a clamping rod (15) is fixedly mounted on one side of every two connecting rods (14); a plurality of bayonet holes (16) are provided on one side of the clamping rod (15); an arc-shaped clamping block (17) is fixedly mounted on one side of the bayonet hole (16).

2. The polypropylene film capacitor according to claim 1, characterized in that: A telescopic rod (20) is fixedly mounted on the top surface of the mounting column (4); the telescopic rod (20) and the reel (6) are movably sleeved together; a limit block (21) is fixedly mounted on the top surface of the telescopic rod (20); and a first spring (22) is sleeved on the outside of the telescopic rod (20).

3. The polypropylene film capacitor according to claim 2, characterized in that: The inner circular wall surface of the reel (6) is provided with two clamping holes (23), the inner sleeve of the clamping hole (23) is provided with a round clamping block (25), the outer surface of the round clamping block (25) is provided with a second spring (26), and the outer circular wall surface of the telescopic rod (20) is provided with two fixing grooves (24), and the round clamping block (25) is movably clamped with the fixing groove (24).

4. The polypropylene film capacitor according to claim 3, characterized in that: The outer circular wall surface of the end cover (2) is provided with two clamping grooves (28), and the inner circular wall surface of the housing (1) is fixedly mounted with two clamping buckles (27), and the clamping buckles (27) are movably clamped with the clamping grooves (28).

5. The polypropylene film capacitor according to claim 1, characterized in that: An explosion-proof hole (29) is provided on the top surface of the end cover (2), and an explosion-proof valve (30) is fixedly mounted on the inner circular wall surface of the explosion-proof hole (29).

6. The polypropylene film capacitor according to claim 4, characterized in that: A connecting hole (34) is provided on one side of the clamping rod (15), a connecting bolt (35) is threadedly connected to the interior of the connecting hole (34), and the connecting bolt (35) is threadedly connected to the connecting rod (14).

7. The polypropylene film capacitor according to claim 1, characterized in that: An insulating pad (19) is fixedly adhered to one side of the arc-shaped clamping block (17).

8. The polypropylene film capacitor according to claim 1, characterized in that: Epoxy resin (32) is filled between the outer shell (1) and the aluminum shell (3).

9. The polypropylene film capacitor according to claim 8, characterized in that: An anti-overflow ring (33) is fixedly mounted on the inner circular wall surface of the housing (1).

10. The polypropylene film capacitor according to claim 1, characterized in that: A mounting plate (31) is fixedly mounted on the bottom surface of the housing (1).

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