Low-noise low-capacitance-failure thin-film capacitor and production process thereof

Abstract

The invention discloses a low-noise low-capacitance-failure thin-film capacitor and a production process thereof, and particularly relates to the field of thin-film capacitors, and the production process sequentially comprises the steps of film coating, slitting, winding, vacuum drying, metal spraying, vacuum wax dipping, centrifuging, welding, packaging, testing and packaging. Wherein a centrifugal device is adopted for centrifugation, the centrifugal device comprises a workbench, a mounting seat is arranged on the workbench, a clamping driving part is mounted on the mounting seat, two groups of mounting parts are mounted on the clamping driving part, and the clamping driving part is used for driving the two groups of mounting parts to get close to each other or get away from each other. The internal stress of the capacitor and the gaps between the dielectric film layers of the film capacitor are eliminated through vacuum drying treatment, the gaps inside the dielectric film layer I are filled and air is exhausted in a vacuum wax dipping mode, wax is insoluble in water and good in humidity resistance, and the production process can effectively reduce the noise of the capacitor and the capacitance attenuation rate.

Description

Technical Field

[0001] The present invention relates to the technical field of thin film capacitors. More specifically, the present invention relates to a low-noise and low-capacitance-decay thin film capacitor and its manufacturing process. Background Art

[0002] A thin film capacitor is a capacitor that uses a metal foil as an electrode and a plastic film such as polyester, polypropylene, polystyrene, or polycarbonate as a dielectric. Thin film capacitors have the characteristics of being non-polar, having low dielectric loss, long lifespan, excellent high-frequency and temperature characteristics.

[0003] The general manufacturing process flow of a common metallized thin film capacitor is: coating, slitting, winding, pre-pressing, hot pressing, drying, spraying gold, welding, encapsulation, testing, and packaging.

[0004] There are certain gaps between the dielectric film layers of a thin film capacitor. In some circuit applications, due to the applied voltage and distorted frequency waveform at both ends of the capacitor, a certain resonance is formed due to the Coulomb force between the two electrodes of the capacitor, resulting in a certain rumbling sound (noise).

[0005] Since there is a certain amount of air inside the wound thin film capacitor core and the air cannot be completely removed during the subsequent production process, the air inside the capacitor core causes ionization of the metal electrode evaporation coating over time, resulting in a reduction in the effective area of the metal electrode and ultimately leading to a decay in the capacitor capacitance. Summary of the Invention

[0006] A low-noise and low-capacitance-decay thin film capacitor and its manufacturing process provided by the present invention aim to solve the problems of noise generation and capacitance decay in thin film capacitors.

[0007] To achieve the above object, the present invention provides the following technical solution: A manufacturing process for a low-noise and low-capacitance-decay thin film capacitor, the manufacturing process sequentially includes coating, slitting, winding, vacuum drying, spraying gold, vacuum wax dipping, centrifugation, welding, encapsulation, testing, and packaging; wherein, centrifugation is performed using a centrifugation device, the centrifugation device includes a workbench, an installation seat is arranged on the workbench, a clamping and driving component is installed on the installation seat, two installation components are installed on the clamping and driving component, and the clamping and driving component is used to drive the two installation components to approach or move away from each other; wax delivery pipes are installed at the bottoms of the two installation components, when the two installation components approach each other, the two wax delivery pipes are used to clamp the two ends of the thin film capacitor, the centrifugation device further includes a wax heating and circulating component, the wax heating and circulating component is communicated with the two wax delivery pipes, and the two wax delivery pipes are communicated with the core space of the thin film capacitor, so that the wax heating and circulating component, the two wax delivery pipes, and the core space form a loop.

[0008] In a preferred embodiment, the temperature and time of vacuum drying are 85 degrees for 40 minutes, 110 degrees for 90 minutes, and 85 degrees for 40 minutes in sequence, and the vacuum degree is -0.1 Mpa; the vacuum wax dipping time is 8 to 10 hours.

[0009] In a preferred embodiment, the installation component includes a moving seat, a cylinder is installed on the moving seat, an installation head is installed at the output end of the cylinder, the cylinder is used to drive the installation head to move vertically, and the wax delivery pipe is installed on the installation head.

[0010] In a preferred embodiment, the wax delivery pipe is rotatably connected to the installation head, a second motor is installed at the output end of the cylinder, the second motor is used to drive the wax delivery pipe to rotate self, a heat preservation plug board is inserted at the front end of the wax delivery pipe, and the heat preservation plug board can move along the radial direction of the end of the wax delivery pipe to open or close the end of the wax delivery pipe.

[0011] In a preferred embodiment, the centrifugal device further includes a control component, the control component includes a control disk, the control disk is movably sleeved on the outside of the wax delivery pipe and fixedly connected to the output end of the cylinder, an inner ring channel and an outer ring channel located outside the inner ring channel are formed on the side surface of the control disk, and there is a communication port between the inner ring channel and the outer ring channel, and the communication port connects the inner ring channel and the outer ring channel.

[0012] In a preferred embodiment, an inner switching block is rotatably connected to the middle of the control disk, an inner limiting shaft one and an inner limiting shaft two are fixedly connected to the control disk and are respectively located on both sides of the inner switching block, the inner switching block swings between the inner limiting shaft one and the inner limiting shaft two, and the inner switching block is reset towards the direction of the inner limiting shaft one through an elastic component one; an outer switching block is rotatably connected to the edge of the control disk, an outer limiting shaft one and an outer limiting shaft two are fixedly connected to the control disk and are respectively located on both sides of the outer switching block, the outer switching block swings between the outer limiting shaft one and the outer limiting shaft two, and the outer switching block is reset towards the direction of the outer limiting shaft one through an elastic component two. The inner switching block and the outer switching block are respectively used to connect or disconnect the inner ring channel and the outer ring channel at the position of the communication port, and a guiding shaft is fixedly connected to the heat preservation plug board, and the guiding shaft slides inside the inner ring channel or the outer ring channel.

[0013] In a preferred embodiment, a pressure rod is fixedly connected to the upper end of the wax delivery pipe, an arc-shaped pressing plate is fixedly connected to the pressure rod, and a supporting component is installed on the workbench. The supporting component includes a supporting seat, U-shaped plates are fixedly installed on both sides of the supporting seat, and outer folding parts extending obliquely upward are provided on both sides of the upper end of the U-shaped plate.

[0014] In a preferred embodiment, the wax heating and circulating component includes a delivery pump and a heating tank respectively installed on two installation components. The input end of the delivery pump is connected to the heating tank through a third pipe, the output end of the delivery pump is connected to one end of one wax delivery pipe through a first pipe, and the other wax delivery pipe is connected to the inside of the heating tank through a second pipe.

[0015] In a preferred embodiment, the clamping drive component includes a fixing frame fixedly installed on the mounting base. A first motor is installed on the mounting base, and the output end of the first motor is provided with a bidirectional lead screw. The thread directions at both ends of the bidirectional lead screw are opposite, and two moving seats are respectively in threaded driving connection with both ends of the bidirectional lead screw.

[0016] In a preferred embodiment, a low-noise and low-capacitance-decay thin-film capacitor is processed by using the above-mentioned generation process. The thin-film capacitor sequentially includes a first dielectric thin-film layer, a first metal foil layer, a second dielectric thin-film layer, and a second metal foil layer. The first dielectric thin-film layer, the first metal foil layer, the second dielectric thin-film layer, and the second metal foil layer are wound into a roll. A core space is provided in the middle of the thin-film capacitor, wax is filled in the core space, metal pins are connected to the first metal foil layer and the second metal foil layer, and a protective layer is provided outside the thin-film capacitor.

[0017] Technical effects and advantages of the present invention: The present invention adopts vacuum drying treatment to eliminate the internal stress of the capacitor and the gaps between the dielectric thin-film layers of the thin-film capacitor, and uses the method of vacuum impregnation with wax to fill the gaps inside the first dielectric thin-film layer and remove air. Moreover, the wax is insoluble in water and has good moisture-proof performance. This production process can effectively reduce the noise and the rate of capacitance decay of the capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the partial structure of the present invention Figure 1 .

[0020] Figure 3 It is for the present invention Figure 2 A partial structural schematic diagram of the cross-sectional view.

[0021] Figure 4 It is a schematic diagram of the partial structure of the present invention Figure 2 .

[0022] Figure 5 It is a schematic diagram of the states of the internal switching block and the first internal limiting shaft of the present invention Figure 1 .

[0023] Figure 6 It is a schematic diagram of the states of the internal switching block and the first internal limiting shaft of the present invention Figure 2 .

[0024] Figure 7 It is a schematic diagram of the states of the internal switching block and the first internal limiting shaft of the present invention Figure 3 .

[0025] Figure 8 It is a schematic diagram of the structure of the support component of the present invention.

[0026] Figure 9 This is the process flow diagram for generating the thin film capacitor of the present invention.

[0027] Figure 10 This is the schematic structural diagram of the thin film capacitor of the present invention.

[0028] The reference numerals are: 1, workbench; 2, mounting seat; 3, clamping drive component; 31, fixing frame; 32, motor 1; 33, bidirectional lead screw; 4, mounting component; 41, moving seat; 42, cylinder; 43, mounting head; 5, wax delivery pipe; 6, wax heating and circulation component; 61, delivery pump; 62, pipe 1; 63, heating tank; 64, pipe 2; 65, pipe 3; 7, motor 2; 71, bevel gear set; 8, heat preservation plug board; 81, guide shaft; 9, control component; 90, control panel; 91, inner ring channel; 92, outer ring channel; 93, communication port; 94, inner switching block; 95, inner limiting shaft 1; 96, inner limiting shaft 2; 97, outer switching block; 98, outer limiting shaft 1; 99, outer limiting shaft 2; 100, pressure rod; 101, arc-shaped pressing plate; 200, support component; 201, support seat; 202, U-shaped plate; 203, outer folding part; 300, thin film capacitor; 301, dielectric film layer 1; 302, metal foil layer 1; 303, dielectric film layer 2; 304, metal foil layer 2; 305, core space. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Refer to the attached drawings of the specification Figures 1 - 10 , a process for generating a low-noise and low-capacitance-decay thin film capacitor, the generation process sequentially includes the following steps: Step 1, coating: Using vacuum evaporation technology, the metal is vaporized at high temperature and uniformly adheres to the surface of the thin film.

[0031] Step 2, slitting: Using a high-precision slitter to slit the wide-width coated thin film into the required width to match the capacitor size.

[0032] Step 3, winding: Using an automatic winding machine to wind the dielectric film layer 1 301, the metal foil layer 1 302, the dielectric film layer 2 303, and the metal foil layer 2 304 into a roll.

[0033] Step 4: Vacuum drying: Use a vacuum dryer for drying. The temperature and time for vacuum drying are 85°C for 40 minutes, 110°C for 90 minutes, and 85°C for 40 minutes in sequence, and the vacuum degree is -0.1 Mpa.

[0034] Step 5: Spraying gold: Spray molten metal on both end faces of the capacitor through arc or flame to form a conductive layer with a thickness of about 0.1 - 0.5 mm, connecting the internal metal foil layer.

[0035] Step 6: Vacuum wax dipping: Use a vacuum wax dipping machine for wax dipping. The vacuum wax dipping time is 8 to 10 hours.

[0036] Step 7: Centrifugation: Make the wax on the outer surface of the film capacitor 300 evenly distributed.

[0037] Step 8: Welding: Weld copper wires or metal terminals to the gold-sprayed end faces.

[0038] Step 9: Encapsulation: Install the capacitor into a plastic shell and fill it with epoxy resin.

[0039] Step 10: Testing: Conduct electrical performance tests, including capacitance, withstand voltage, and reliability.

[0040] Step 11: Packaging: Label, encapsulate with an anti-static bag, and add shock-proof materials to the outer box.

[0041] In Step 7, centrifugation is carried out using a centrifugation device. The centrifugation device includes a workbench 1. An installation seat 2 is arranged on the workbench 1. A clamping and driving component 3 is installed on the installation seat 2. Two installation components 4 are installed on the clamping and driving component 3. The clamping and driving component 3 is used to drive the two installation components 4 to approach or move away from each other. The bottoms of the two installation components 4 are both installed with wax delivery pipes 5. When the two installation components 4 approach each other, the two wax delivery pipes 5 are used to clamp both ends of the film capacitor 300. The centrifugation device further includes a wax heating and circulation component 6. The wax heating and circulation component 6 is communicated with the two wax delivery pipes 5, and the two wax delivery pipes 5 are communicated with the core space 305 of the film capacitor 300, so that the wax heating and circulation component 6, the two wax delivery pipes 5, and the core space 305 form a loop.

[0042] In the above technical solution, as Figure 1 、 Figure 2 and Figure 4 shown, the installation component 4 includes a moving seat 41. A cylinder 42 is installed on the moving seat 41. The output end of the cylinder 42 is installed with an installation head 43. The cylinder 42 is used to drive the installation head 43 to move vertically. The wax delivery pipe 5 is installed on the installation head 43.

[0043] In the above technical solution, as Figure 1 and Figure 2, the clamping drive component 3 includes a fixed frame 31 which is fixedly installed on the mounting base 2. A first motor 32 is installed on the mounting base 2, and an output end of the first motor 32 is installed with a bidirectional lead screw 33. Threads at two ends of the bidirectional lead screw 33 have opposite helix directions, and two moving seats 41 are respectively in threaded driving connection with two ends of the bidirectional lead screw 33.

[0044] It should be noted that, due to the opposite helix directions of the threads at two ends of the bidirectional lead screw 33, when the first motor 32 drives the bidirectional lead screw 33 to rotate, the bidirectional lead screw 33 can drive two mounting components 4 to approach or move away from each other, so as to facilitate clamping the film capacitor 300.

[0045] In the above technical solution, as Figures 1 - 3 , the wax heating and circulating component 6 includes a delivery pump 61 and a heating tank 63 which are respectively installed on two mounting components 4. An input end of the delivery pump 61 is communicated with the heating tank 63 through a third pipeline 65, an output end of the delivery pump 61 is communicated with one end of one wax delivery pipe 5 through a first pipeline 62, and the other wax delivery pipe 5 is communicated with the inside of the heating tank 63 through a second pipeline 64.

[0046] It should be noted that an electric heater is arranged inside the heating tank 63 for heating the wax to make it molten. The delivery pump 61 is used for delivering the molten wax so that the wax circulates in the delivery pump 61, the first pipeline 62, the wax delivery pipe 5, the core space 305, the wax delivery pipe 5, the second pipeline 64, and the heating tank 63 in sequence. Lower parts of the first pipeline 62 and the second pipeline 64 are both rigid pipes, the rigid pipe parts are fixed to the moving seat 41, and bottoms of the rigid pipes are rotationally connected and communicated with the wax delivery pipe 5. An upper part of the first pipeline 62 is a flexible pipe which is communicated with the delivery pump 61, an upper part of the second pipeline 64 is a flexible pipe which is communicated with the heating tank 63, and heat insulation layers are arranged outside the first pipeline 62 and the second pipeline 64.

[0047] In this embodiment, the implementation method is specifically as follows: Place the capacitor impregnated with wax in vacuum between two wax delivery pipes 5, and then drive two mounting components 4 to approach each other through the clamping drive component 3, so that the two wax delivery pipes 5 clamp two ends of the capacitor. It should be noted that, as Figure 1 and Figure 2 shown, when the film capacitor 300 is placed horizontally, since the wax at the core space 305 is in a molten state, a part of the wax is likely to flow out. When the wax solidifies and is re-sealed, there will be a part of air. Therefore, this problem needs to be avoided. After clamping the film capacitor 300, the wax is circulated through the delivery pump 61, then the wax and air located in the core space 305 will be circulated to the inside of the heating tank 63. The air is discharged into the heating tank 63 and discharged from holes on the heating tank 63, and the wax continues to participate in the circulation. When removing the wax, use tools to block two ends of the core space 305 to prevent it from flowing out, and wait for the wax to solidify.

[0048] The above technical solution adopts vacuum drying treatment to eliminate the internal stress of the capacitor and the gaps between the dielectric film layers of the thin film capacitor 300. The method of vacuum wax impregnation is used to fill the gaps inside the dielectric film layer 301 and remove air. Moreover, the wax is insoluble in water and has good moisture-proof performance. This production process can effectively reduce the capacitor noise and the rate of capacitance decay.

[0049] Refer to the attached instructions Figures 1 - 8 , the wax delivery pipe 5 is rotatably connected to the installation head 43. The output end of the air cylinder 42 is equipped with a second motor 7, and the second motor 7 is used to drive the wax delivery pipe 5 to rotate self - clockwise. The front end of the wax delivery pipe 5 is inserted with a heat - preservation plug 8, and the heat - preservation plug 8 can move along the radial direction of the end of the wax delivery pipe 5 to open or close the end of the wax delivery pipe 5.

[0050] It should be noted that, as Figures 1 - 3 shown, the second motor 7 drives the wax delivery pipe 5 to rotate through a bevel gear set 71, and the bevel gear set 71 is composed of two bevel gears.

[0051] Furthermore, the centrifugal device further includes a control component 9. The control component 9 includes a control disk 90. The control disk 90 is movably sleeved outside the wax delivery pipe 5 and fixedly connected to the output end of the air cylinder 42. An inner ring channel 91 and an outer ring channel 92 located outside the inner ring channel 91 are formed on the side surface of the control disk 90. There is a communication port 93 between the inner ring channel 91 and the outer ring channel 92, and the communication port 93 connects the inner ring channel 91 and the outer ring channel 92.

[0052] Still further, an inner switching block 94 is rotatably connected to the middle of the control disk 90. Inner limiting shafts 95 and 96 are fixedly connected to the control disk 90 on both sides of the inner switching block 94 respectively. The inner switching block 94 swings between the inner limiting shaft 95 and the inner limiting shaft 96, and the inner switching block 94 is reset in the direction of the inner limiting shaft 95 through an elastic member 1; an outer switching block 97 is rotatably connected to the edge of the control disk 90. Outer limiting shafts 98 and 99 are fixedly connected to the control disk 90 on both sides of the outer switching block 97 respectively. The outer switching block 97 swings between the outer limiting shaft 98 and the outer limiting shaft 99, and the outer switching block 97 is reset in the direction of the outer limiting shaft 98 through an elastic member 2. The inner switching block 94 and the outer switching block 97 are respectively used to connect or disconnect the inner ring channel 91 and the outer ring channel 92 at the position of the communication port 93. A guiding shaft 81 is fixedly connected to the heat - preservation plug 8, and the guiding shaft 81 slides inside the inner ring channel 91 or the outer ring channel 92.

[0053] It should be noted that both the elastic member 1 and the elastic member 2 are torsion springs. As Figure 5 shown, when the guiding shaft 81 moves inside the inner ring channel 91, and the heat - preservation plug 8 and the guiding shaft 81 rotate clockwise, when the guiding shaft 81 touches the inner switching block 94, the inner switching block 94 will rotate and abut against the inner limiting shaft 96. AsFigure 6 As shown, then, the guiding shaft 81 can enter the outer ring channel 92 from the position of the communication port 93. Then, the inner switching block 94 resets under the action of the torsion spring. When the guiding shaft 81 slides clockwise inside the outer ring channel 92, when it encounters the outer switching block 97, similarly, the outer switching block 97 will rotate and abut against the second outer limiting shaft 99, as Figure 7 shown. Then, the guiding shaft 81 can enter the inner ring channel 91 from the position of the communication port 93. Then, the outer switching block 97 resets under the action of the torsion spring.

[0054] Furthermore, the upper end of the wax delivery pipe 5 is fixedly connected with a pressure rod 100. An arc-shaped pressing plate 101 is fixedly connected to the pressure rod 100. A support member 200 is installed on the workbench 1. The support member 200 includes a support seat 201. U-shaped plates 202 are fixedly installed on both sides of the support seat 201. Outer folded portions 203 extending obliquely upward are provided on both sides of the upper end of the U-shaped plate 202.

[0055] It should be noted that the U-shaped plate 202 is used to support the thin film capacitor 300.

[0056] In this embodiment, the implementation method is specifically as follows: After centrifuging the thin film capacitor 300, when removing the wax, tools are used to block both ends of the core space 305 to prevent it from flowing out. The operation is difficult, and when removing the tools, some wax may be taken down, resulting in incomplete filling. Therefore, in this embodiment, after centrifugation is completed, the thin film capacitor 300 is fixed, the wax delivery pipe 5 and the core space 305 are isolated, and the wax delivery pipe 5 is rotated. In this way, after the wax in the core space 305 solidifies, the thin film capacitor 300 can be directly removed.

[0057] Specifically, before using the wax delivery pipe 5 to clamp the thin film capacitor 300, the heat preservation plug board 8 closes the end of the wax delivery pipe 5. After the two wax delivery pipes 5 clamp the thin film capacitor 300, the surface of the heat preservation plug board 8 fits and contacts the end of the thin film capacitor 300 to block the core space 305. The motor two 7 drives the wax delivery pipe 5, the heat preservation plug board 8 and the guiding shaft 81 to rotate clockwise ( Figure 5 viewed from the direction of ). The guiding shaft 81 enters the inside of the outer ring channel 92 from the position of the communication port 93. At this time, the guiding shaft 81 drives the heat preservation plug board 8 to move upward to open the wax delivery pipe 5, so that the wax delivery pipe 5 and the core space 305 are communicated. Then, the wax heating and circulating component 6 can circulate the wax to remove air. During this process, the motor two 7 and the bevel gear set 71 drive the wax delivery pipe 5 to rotate, and the two wax delivery pipes 5 drive the thin film capacitor 300 to rotate, so that centrifugation can be carried out. It should be noted that during centrifugation, the wax delivery pipe 5 rotates in a reciprocating manner, that is, it is necessary to ensure that the guiding shaft 81 moves inside the outer ring channel 92 and does not move to the position of the communication port 93 to prevent the guiding shaft 81 from entering the inner ring channel 91.

[0058] After the centrifugation is completed, the second motor 7 drives the wax delivery pipe 5, the heat preservation plug board 8 and the guide shaft 81 to rotate clockwise, so that the guide shaft 81 returns from the outer ring channel 92 to the inside of the inner ring channel 91. At this time, the guide shaft 81 drives the heat preservation plug board 8 to close the wax delivery pipe 5, and the surface of the heat preservation plug board 8 is in fitting contact with the end of the thin film capacitor 300 to block the core space 305; the moving seat 41 drives the thin film capacitor 300 to move downward, so that the thin film capacitor 300 is supported on the outer folding part 203, and the pressing rod 100 and the arc-shaped pressing plate 101 move together with the guide shaft 81, so that when moving downward, they can contact the upper surface of the thin film capacitor 300 to limit the upper end of the thin film capacitor 300. Then the second motor 7 drives the wax delivery pipe 5 to rotate again. At this time, since the thin film capacitor 300 is supported and restricted, it will not rotate. The clamping force can also be appropriately adjusted by the clamping drive component 3 so that the wax delivery pipe 5 and the thin film capacitor 300 can rotate relative to each other. During this process, the wax delivery pipe 5 also rotates in a reciprocating manner, that is, it is necessary to ensure that the guide shaft 81 moves within the inner ring channel 91 and does not move to the position of the communication port 93 to prevent the guide shaft 81 from entering the outer ring channel 92.

[0059] In the above technical solution, through the setting of the heat preservation plug board 8, after the wax delivery pipe 5 is blocked, the purpose of heat insulation can be achieved. When the wax delivery pipe 5 and the thin film capacitor 300 rotate relative to each other, on the one hand, the wax in the core space 305 can solidify, and on the other hand, there will be no adhesion between the heat preservation plug board 8 and the wax in the core space 305. In this way, when the thin film capacitor 300 is taken off, the wax in the core space 305 will not be taken out.

[0060] Refer to the attached Figures 1 - 10 A low-noise and low-capacitance-decay thin film capacitor is processed by using the above-mentioned production process. The thin film capacitor 300 successively includes a first dielectric film layer 301, a first metal foil layer 302, a second dielectric film layer 303 and a second metal foil layer 304. The first dielectric film layer 301, the first metal foil layer 302, the second dielectric film layer 303 and the second metal foil layer 304 are wound into a roll. The middle part of the thin film capacitor 300 has a core space 305 filled with wax. The first metal foil layer 302 and the second metal foil layer 304 are connected with metal pins, and the outside of the thin film capacitor 300 is a protective layer.

[0061] It should be noted that the materials of the first metal foil layer 302 and the second metal foil layer 304 are aluminum or copper, the materials of the first dielectric film layer 301 and the second dielectric film layer 303 are polyester or polypropylene or polystyrene or polycarbonate, the wax is paraffin wax, and the protective layer is epoxy resin.

[0062] Finally, the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A process for producing a low-noise and low-capacitance-decay film capacitor, characterized in that: The production process includes coating, slitting, winding, vacuum drying, gold spraying, vacuum wax dipping, centrifugation, welding, encapsulation, testing and packaging; The centrifuge adopts a centrifugal device, the centrifugal device comprising a workbench (1), the workbench (1) being provided with a mounting seat (2), the mounting seat (2) being provided with a clamping drive component (3), the clamping drive component (3) being provided with two groups of mounting components (4), the clamping drive component (3) being used to drive the two groups of mounting components (4) to move closer to or further away from each other; wax delivery pipes (5) are both installed at the bottom of the two groups of mounting components (4), when the two mounting components (4) move closer to each other, the two wax delivery pipes (5) are used to clamp at both ends of the film capacitor (300), the centrifugal device further comprising a wax heating circulation component (6), the wax heating circulation component (6) being connected to the two wax delivery pipes (5), and the two wax delivery pipes (5) being connected to the core space (305) of the film capacitor (300), so that the wax heating circulation component (6), the two wax delivery pipes (5) and the core space (305) form a loop.

2. A process for producing a low-noise and low-capacitance-decay film capacitor according to claim 1, characterized in that: The temperature and time of vacuum drying are 85 degrees for 40 minutes, 110 degrees for 90 minutes, and 85 degrees for 40 minutes, respectively, and the vacuum degree is -0.1Mpa; the vacuum wax dipping time is 8 to 10 hours.

3. A process for producing a low-noise and low-capacitance-decay film capacitor according to claim 1, characterized in that: The mounting component (4) comprises a movable seat (41), a cylinder (42) is mounted on the movable seat (41), a mounting head (43) is mounted on the output end of the cylinder (42), the cylinder (42) is used to drive the mounting head (43) to move vertically, and the wax delivery pipe (5) is mounted on the mounting head (43).

4. A process for producing a low-noise and low-capacitance-decay film capacitor according to claim 3, characterized in that: The wax delivery pipe (5) is rotatably connected to the mounting head (43); a second motor (7) is mounted on the output end of the cylinder (42); the second motor (7) is used to drive the wax delivery pipe (5) to rotate; a heat-insulating plug plate (8) is plugged into the front end of the wax delivery pipe (5); the heat-insulating plug plate (8) is movable along the radial direction of the end of the wax delivery pipe (5) to open or close the end of the wax delivery pipe (5).

5. A process for producing a low-noise and low-capacitance-decay film capacitor according to claim 4, characterized in that: The centrifugal device further comprises a control component (9), wherein the control component (9) comprises a control disk (90), wherein the control disk (90) is movably sleeved on the outside of the wax delivery pipe (5) and fixedly connected to the output end of the cylinder (42), wherein the side of the control disk (90) is provided with an inner ring channel (91) and an outer ring channel (92) located outside the inner ring channel (91), wherein a connecting port (93) is provided between the inner ring channel (91) and the outer ring channel (92), wherein the connecting port (93) connects the inner ring channel (91) with the outer ring channel (92).

6. A process for producing a low-noise and low-capacitance-decay film capacitor according to claim 5, characterized in that: The middle of the control disk (90) is rotatably connected to an inner switching block (94); the control disk (90) is fixedly connected to an inner limit shaft (95) and an inner limit shaft (96) located on both sides of the inner switching block (94); the inner switching block (94) swings between the inner limit shaft (95) and the inner limit shaft (96); and the inner switching block (94) is reset in the direction of the inner limit shaft (95) by means of an elastic component (1); the edge of the control disk (90) is rotatably connected to an outer switching block (97); the control disk (90) is fixedly connected to inner limit shafts (95) and inner limit shafts (96) located on both sides of the outer switching block (97). The outer limit shaft (98) and the outer limit shaft (99) are respectively connected to each other, the outer switching block (97) swings between the outer limit shaft (98) and the outer limit shaft (99), and the outer switching block (97) is reset in the direction of the outer limit shaft (98) through the elastic component (94), the inner switching block (94) and the outer switching block (97) are respectively used to connect or disconnect the inner ring road (91) and the outer ring road (92) at the position of the connecting port (93), and the guide shaft (81) is fixedly connected to the heat preservation plug plate (8), and the guide shaft (81) slides inside the inner ring road (91) or the outer ring road (92).

7. A process for producing a low-noise and low-capacitance-decay film capacitor according to claim 6, characterized in that: The upper end of the wax delivery pipe (5) is fixedly connected to a pressure rod (100), and an arc-shaped pressure plate (101) is fixedly connected to the pressure rod (100). A support component (200) is installed on the workbench (1), and the support component (200) comprises a support seat (201), and U-shaped plates (202) are fixedly installed on both sides of the support seat (201), and both sides of the upper end of the U-shaped plate (202) have outer folding portions (203) extending obliquely upward.

8. The process for producing a low-noise and low-capacitance-decay film capacitor according to claim 1, characterized in that: The wax heating circulation component (6) comprises a delivery pump (61) and a heating tank (63) respectively mounted on two mounting components (4); an input end of the delivery pump (61) is connected to the heating tank (63) via a third pipe (65); an output end of the delivery pump (61) is connected to one end of one of the wax delivery pipes (5) via a first pipe (62); and the other wax delivery pipe (5) is connected to the interior of the heating tank (63) via a second pipe (64).

9. The process for producing a low-noise and low-capacitance-decay film capacitor according to claim 3, characterized in that: The clamping drive component (3) comprises a fixing frame (31), the fixing frame (31) being fixedly mounted on a mounting seat (2), a motor 1 (32) being mounted on the mounting seat (2), a bidirectional screw rod (33) being mounted at an output end of the motor 1 (32), the threads at both ends of the bidirectional screw rod (33) being rotated in opposite directions, and the two movable seats (41) are respectively threadedly connected to the two ends of the bidirectional screw rod (33).

10. A low-noise and low-capacitance-loss film capacitor, manufactured using the production process according to any one of claims 1 to 9, characterized in that: The film capacitor (300) comprises a dielectric film layer 1 (301), a metal foil layer 1 (302), a dielectric film layer 2 (303) and a metal foil layer 2 (304) in sequence; the dielectric film layer 1 (301), the metal foil layer 1 (302), the dielectric film layer 2 (303) and the metal foil layer 2 (304) are wound into a roll; a core space (305) is provided in the middle of the film capacitor (300); the core space (305) is filled with wax; the metal foil layer 1 (302) and the metal foil layer 2 (304) are connected by metal pins; and the outside of the film capacitor (300) is a protective layer.

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