CN105655157A - High-pressure lifting impregnation equipment of capacitor and impregnation method - Google Patents
High-pressure lifting impregnation equipment of capacitor and impregnation method Download PDFInfo
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- CN105655157A CN105655157A CN201610162537.7A CN201610162537A CN105655157A CN 105655157 A CN105655157 A CN 105655157A CN 201610162537 A CN201610162537 A CN 201610162537A CN 105655157 A CN105655157 A CN 105655157A
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- impregnation
- pressure
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- capacitor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
- H01G13/04—Drying; Impregnating
Abstract
The invention discloses high-pressure lifting impregnation equipment of a capacitor. The equipment comprises an impregnation device and a liquid storage device which are communicated with each other through pipeline systems; the impregnation device is arranged on a rack and comprises two impregnation barrels which are arranged in the rack side by side, and each impregnation barrel is provided with an external shell; the liquid storage device comprises two liquid storage barrels which are arranged behind the rack side by side and correspond to the impregnation barrels one to one; each pipeline system comprises two liquid inlet pipelines and two liquid draining pipelines, and each impregnation barrel is communicated with the corresponding liquid storage barrel through the corresponding pipeline system; the impregnation barrels are jointly connected with a vacuumizing pipeline and a pressurizing pipeline which are inserted into the impregnation barrels through air pipelines; the rack is provided with external shell lifting mechanisms which are connected with the external shells of the impregnation barrels. The invention further discloses an impregnation method of the high-pressure lifting impregnation equipment of the capacitor.
Description
Technical field
The present invention relates to the technical field of capacitor impregnation equipment, be specifically related to a kind of capacitor high-pressure lifting impregnation equipment and impregnation method.
Background technology
Vacuum immersion apparatus is electron trade, one of indispensable equipment of vacuum immersion of capacitor class. Its quality will directly influence the parameter value of the certain physical characteristics aspect of capacitor, so the quality containing dipping machine will directly affect the quality of capacitor.
The purpose soaking electrolyte of capacitor is, the electrolytic paper being clipped between two-layer aluminium foil is made fully to adsorb electrolyte, both positive and negative polarity aluminium foil surface is made to be saturated with electrolyte, and soak the larger product of some specification at normal temperatures and pressures and there is the phenomenon that leaching is not saturating, market occurs the equipment of the vacuum immersion improved.
And existing vacuum immersion equipment there is problems in that
1, existing vacuum immersion equipment work space is little, and impregnation product quantity is few;
2, existing impregnation equipment often walks operation needs personnel to have been manually done, such as son of uncapping, enter to arrange electrolyte, the immersion time, circulate evacuation, pressurization, maintenance vacuum time, add malleation time etc., complex steps, the operating technology of staff is required height, the labor intensity of operator is big, and production efficiency is low, and product quality is uneven;
3, existing is the terminal being first impregnated with and riveting capacitor again containing soaking technology, have, under product (sub-prime) working environment being so impregnated with, the possibility being secondary polluted, sub-prime is long because of riveting work open-assembly time in atmosphere, steam in air can be absorbed on product again, affect capacitance characteristic, shorten the service life of finished product; And the product being impregnated with has volatilizable gas, making working environment be affected, discharge, by atmosphere pollution, affects the resident living environment of factory's periphery, field worker health is caused damage.
4, existing is the terminal being first impregnated with and riveting capacitor again containing soaking technology, and such auricle has electrolyte, and during riveted joint, contact resistance is poor, has hidden danger of quality.
The product demand of existing capacitance electronic class constantly increases, and the existing function containing soaking technology and impregnation equipment cannot meet the production requirement of existing capacitor function and parameter.
Summary of the invention
This invention is not enough for current art, it is provided that a kind of capacitor high-pressure lifting impregnation equipment.
The present invention also provides for the impregnation method of a kind of this equipment of application.
The present invention be the technical scheme is that for achieving the above object
A kind of capacitor high-pressure lifting impregnation equipment, it includes dipping device and device for storing liquid, described dipping device is connected by tubing with device for storing liquid, described dipping device is arranged in a frame, described dipping device includes two impregnation buckets being disposed side by side in frame, described impregnation bucket is provided with external shell, and described device for storing liquid includes two and is disposed side by side on frame rear, with impregnation bucket liquid storing barrel one to one;
Described tubing includes two water influent pipeline, two drain line, is connected by tubing between single described impregnation bucket and single described liquid storing barrel;
Two described impregnation buckets are jointly also connected with vacuum-pumping pipeline and pressure pipeline, described vacuum-pumping pipeline and pressure pipeline and are plugged in inside impregnation bucket by air line;
Described frame is provided with external shell elevating mechanism, and described external shell elevating mechanism is connected with the external shell of impregnation bucket.
Described external shell includes lamina rara externa and inner plating, and described inner plating is provided externally with heating board, is provided with insulation material between described lamina rara externa and inner plating, and the top of described impregnation bucket is provided with safety-valve.
Described impregnation bucket is additionally provided with internal work portion, and described internal work portion is provided with multiple impregnation dish load plate, discharge opeing linkage, plate draining valve and plate overflow mechanism, and multiple described impregnation dish load plate stacked on top of one another are arranged on inside impregnation bucket.
Described liquid storing barrel is provided with inner plating and outside plate, is provided with la m between described inner plating and outside plate, contains conduction oil, be provided with insulation material between la m and outside plate between la m and inner plating, and the bottom of liquid storing barrel is provided with heating element.
Described external shell elevating mechanism includes the fluctuating orbit and the power generating apparatus that are arranged on frame sidepiece, described frame sidepiece is additionally provided with power transmission chain, described fluctuating orbit is provided with elevating oil cylinder, and described elevating oil cylinder is connected by contiguous block and external shell are fixing;
Described power generating apparatus connects described power transmission chain, and described power transmission chain connects described elevating oil cylinder.
Described external shell elevating mechanism also includes track retainer, and described track retainer is arranged on the top of frame, connects and fixing described fluctuating orbit.
Described water influent pipeline is provided with filter, and this filter is arranged between liquid storing barrel and impregnation bucket.
Described capacitor high-pressure lifting impregnation equipment is additionally provided with vacuum equipment, and described vacuum equipment includes blowdown piping and valve, and this blowdown piping connects with air pipe line;
Described vacuum equipment also includes vacuum filter, and this vacuum filter is positioned close to liquid storing barrel side.
A kind of impregnation method implementing above-mentioned capacitor high-pressure lifting impregnation equipment, it is characterised in that it comprises the following steps:
(1) dry fuse is riveted cover plate, it is thus achieved that riveted the capacitor semi-finished product of end cap;
(2) the capacitor semi-finished product of step (1) are placed in capacitor high-pressure lifting impregnation equipment and soak electrolyte, overfall height according to fuse altitude mixture control plate overflow mechanism, and set impregnation parameter, in impregnation process, it is ensured that electrolyte is not dipped into cover plate.
Described step (2) is specifically further comprising the steps of:
(21) setting of described capacitor semi-finished product being placed in basket and arrange each capacitor semi-finished product is level, in the impregnation dish load plate put into after being dried by basket;
(22) the overfall height according to fuse altitude mixture control plate overflow mechanism, locking impregnation equipment machine cylinder cap, locking closure is evacuation just, reach first evacuation setting pressure and after the time, liquid feed valve is opened, negative pressure in impregnation bucket is utilized to suck electrolyte, electrolyte passes through the nethermost impregnation dish load plate of overfall runner from uppermost impregnation dish load plate, finally it is flowed into the bottom of impregnation bucket, when liquid level reaches bottom high position induction apparatus, represent that feed liquor completes, liquid feed valve is closed, air bleeding valve is opened, when after air pressure balance, pressurizing valve is opened, when impregnation bucket internal gas pressure reaches discharge opeing pressure, tapping valve is opened, normal pressure in bucket is utilized to carry out discharge opeing, when liquid level decline reaches low level induction apparatus action, tapping valve is closed, air bleeding valve is opened, after pressure reaches balance, vacuum pumping valve is opened, start to be impregnated with the evacuation of cycle stage, after reaching Preset Time, start to supplement containing immersion, fluid infusion is balanced pressure after completing, balance pressure starts pressurization and pressurize after completing, it is balanced pressure after reaching preheating setting time, next circulation is carried out after completing, after reaching set point number until cycle-index, carry out impregnation dish load plate discharge opeing and impregnation bucket discharge opeing, after discharge opeing completes, alarm has been impregnated with.
Beneficial effects of the present invention: the brand-new capacitor high-pressure lifting impregnation equipment of the present invention, for Full-automatic impregnation device, being programmed to, the liquid level entering to arrange electrolyte shows, enters discharge capacity, the number of times of impregnation and the size detection of pressure and controls all to be completed by Automatic Program. Abnormal conditions in work reflect in man machine interface, and maintenance conditions is very convenient.
This impregnation equipment is less demanding to the technology of operating personnel, and labor intensity is greatly lowered than ever, and volume of production increases, and quality is not determined by operator, it is ensured that the qualification rate of quality, and impregnation product quality increases substantially.
This impregnation equipment can use same set of impregnation bucket and impregnation dish load plate to be impregnated with the product of different size, and can be impregnated with the electrolyte of different requirement, it is achieved the function of a tractor serves several purposes, improves the utilization rate of equipment, reduces cost of investment.
The impregnation method of the present invention changes traditional technological process, impregnation method of the present invention is first by capacitor rivet connection end cap, then capacitor is placed in impregnation equipment and carries out soaking electrolyte, ensure that auricle does not have electrolyte in riveting process, contact resistance is fine, and in immersion process, ensure that end cap will not be dipped into containing immersion, ensure that product time in exposure air in the process of follow-up encapsulation is greatly shortened, reduce the steam absorbing air as far as possible, ensure that product is not secondary polluted, and improve the sitework environment of riveted joint packaging technology.
Below in conjunction with accompanying drawing and detailed description of the invention, the present invention is described in more detail.
Accompanying drawing explanation
Fig. 1 is the capacitor high-pressure lifting impregnation equipment plan structure schematic diagram of the present embodiment;
Fig. 2 is the main TV structure schematic diagram of capacitor high-pressure lifting impregnation equipment of the present embodiment;
Fig. 3 is the structural representation of the impregnation bucket of the present embodiment;
Fig. 4 is the structural representation of the liquid storing barrel of the present embodiment;
Fig. 5 is the external shell elevating mechanism structural representation of the present embodiment.
In figure: 1. dipping device, 11. impregnation bucket, 12 external shells, 121. lamina rara externa, 122 inner platings, 123 heating boards, 124 insulation materials, 125 safety-valves, 13 internal work portions, 131 impregnation dish load plates, 132 discharge opeing linkages, 133 plate draining valves, 134 plate overflow mechanisms, 2. device for storing liquid, 21 liquid storing barrels, 211 inner platings, 212 outside plates, 213 la ms, 214 heating elements, 3. tubing, 31 water influent pipeline, 32 drain line, 33 filters, 4. vacuum equipment, 41 vacuum-pumping pipeline, 42 pressure pipelines, 43 air lines, 44 blowdown piping 45 vacuum filters, 5 frames, 6 external shell elevating mechanisms, 61 fluctuating orbits, 62 power generating apparatus, 63 power transmission chains, 64 elevating oil cylinders, 65 track retainers.
Detailed description of the invention
Embodiment, referring to Fig. 1��Fig. 5, the capacitor high-pressure lifting impregnation equipment that the present embodiment provides, it includes dipping device 1 and device for storing liquid 2, described dipping device 1 is connected by tubing 3 with device for storing liquid 2, described dipping device 1 is arranged in a frame 5, described dipping device 1 includes two impregnation buckets 11 being disposed side by side in frame 5, described impregnation bucket 11 is provided with external shell 12 and internal work portion 13, described external shell 12 includes lamina rara externa 121 and inner plating 122, described inner plating 122 is provided externally with heating board 123, it is provided with insulation material 124 between described lamina rara externa 121 and inner plating 122, the top of described impregnation bucket 11 is provided with safety-valve 125,Described internal work portion 13 is provided with multiple impregnation dish load plate 131, discharge opeing linkage 132, plate draining valve 133 and plate overflow mechanism 134, and it is internal that multiple described impregnation dish load plate 131 stacked on top of one another are arranged on impregnation bucket 11;
Described device for storing liquid 2 includes two and is disposed side by side on frame 5 rear, with impregnation bucket 11 liquid storing barrel 21 one to one; Described liquid storing barrel 21 is provided with inner plating 211 and outside plate 212, it is provided with la m 213 between described inner plating 211 and outside plate 212, containing conduction oil between la m 213 and inner plating 211, be provided with insulation material between la m 213 and lamina rara externa 212, the bottom of liquid storing barrel is provided with heating element 214.
Described tubing 3 includes 31, two drain line 32 of two water influent pipeline, is connected by tubing 3 between single described impregnation bucket 11 with single described liquid storing barrel 21; Two described impregnation buckets 11 are jointly also connected with vacuum-pumping pipeline 41 and pressure pipeline 42, described vacuum-pumping pipeline 41 and pressure pipeline 42 and are plugged in impregnation bucket 11 inside by air line 43; Described water influent pipeline 31 is provided with filter 33, and this filter 33 is arranged between liquid storing barrel and impregnation bucket 11. Described vacuum equipment 4 also includes blowdown piping 44 and valve, and this blowdown piping 44 connects with air pipe line; Described vacuum equipment 4 also includes vacuum filter 45, and this vacuum filter 45 is positioned close to liquid storing barrel 21 side.
Described frame 5 is provided with external shell elevating mechanism 6, and described external shell elevating mechanism 6 is connected with the external shell 12 of impregnation bucket 11. Described external shell elevating mechanism 6 includes the fluctuating orbit 61 and the power generating apparatus 62 that are arranged on frame 5 sidepiece, described frame 5 sidepiece is additionally provided with power transmission chain 63, described fluctuating orbit is provided with elevating oil cylinder 64, and described elevating oil cylinder 64 is connected by contiguous block is fixing with external shell 12; Described power generating apparatus 62 connects described power transmission chain 63, and described power transmission chain 63 connects described elevating oil cylinder 64. Described external shell elevating mechanism 6 also includes track retainer 65, and described track retainer 65 is arranged on the top of frame 5, connects and fixing described fluctuating orbit 61.
The brand-new capacitor high-pressure lifting impregnation equipment of the present invention, for Full-automatic impregnation device, has been programmed to, and the liquid level entering to arrange electrolyte shows, enters discharge capacity, the number of times of impregnation and the size detection of pressure and controls all to be completed by Automatic Program. Abnormal conditions in work reflect in man machine interface, and maintenance conditions is very convenient.
This impregnation equipment is less demanding to the technology of operating personnel, and labor intensity is greatly lowered than ever, and volume of production increases, and quality is not determined by operator, it is ensured that the qualification rate of quality, and impregnation product quality increases substantially.
This impregnation equipment can use same set of impregnation bucket 11 and impregnation dish load plate 131 to be impregnated with the product of different size, and can be impregnated with the electrolyte of different requirement, it is achieved the function of a tractor serves several purposes, improves the utilization rate of equipment, reduces cost of investment.
What the present embodiment also provided for answers the impregnation method of electricity container high-pressure lifting impregnation equipment, and it comprises the following steps:
(1) dry fuse is riveted cover plate, it is thus achieved that riveted the capacitor semi-finished product of end cap;
(2) the capacitor semi-finished product of step (1) are placed in capacitor high-pressure lifting impregnation equipment and soak electrolyte, overfall height according to fuse altitude mixture control plate overflow mechanism, and set impregnation parameter, in impregnation process, it is ensured that electrolyte is not dipped into cover plate.
Described step (2) is specifically further comprising the steps of:
(21) setting of described capacitor semi-finished product being placed in basket and arrange each capacitor semi-finished product is level, in the impregnation dish load plate put into after being dried by basket;
(22) the overfall height according to fuse altitude mixture control plate overflow mechanism, locking impregnation equipment machine cylinder cap, locking closure is evacuation just, reach first evacuation setting pressure and after the time, liquid feed valve is opened, negative pressure in impregnation bucket is utilized to suck electrolyte, electrolyte passes through the nethermost impregnation dish load plate of overfall runner from uppermost impregnation dish load plate, finally it is flowed into the bottom of impregnation bucket, when liquid level reaches bottom high position induction apparatus, represent that feed liquor completes, liquid feed valve is closed, air bleeding valve is opened, when after air pressure balance, pressurizing valve is opened, when impregnation bucket internal gas pressure reaches discharge opeing pressure, tapping valve is opened, normal pressure in bucket is utilized to carry out discharge opeing, when liquid level decline reaches low level induction apparatus action, tapping valve is closed, air bleeding valve is opened, after pressure reaches balance, vacuum pumping valve is opened, start to be impregnated with the evacuation of cycle stage, after reaching Preset Time, start to supplement containing immersion, fluid infusion is balanced pressure after completing, balance pressure starts pressurization and pressurize after completing, it is balanced pressure after reaching preheating setting time, next circulation is carried out after completing, after reaching set point number until cycle-index, carry out impregnation dish load plate discharge opeing and impregnation bucket discharge opeing, after discharge opeing completes, alarm has been impregnated with
The impregnation method of the present invention changes traditional technological process, first dry for capacitor fuse is riveted end cap by impregnation method of the present invention, then capacitor is placed in impregnation equipment and carries out soaking electrolyte, and in immersion process, ensure that end cap will not be dipped into containing immersion, ensure that product is in the process of follow-up encapsulation, reduce the steam absorbing air, it is ensured that product is not secondary polluted, and improves the sitework environment of riveting process as far as possible.
The present invention is not limited to above-mentioned embodiment, adopts or approximation method identical with the above embodiment of the present invention or device, and other capacitor vacuum high-pressure impregnation equipment and impregnation methods of obtaining, all within protection scope of the present invention.
Claims (10)
1. a capacitor high-pressure lifting impregnation equipment, it is characterized in that, it includes dipping device and device for storing liquid, described dipping device is connected by tubing with device for storing liquid, described dipping device is arranged in a frame, and described dipping device includes two impregnation buckets being disposed side by side in frame, and described impregnation bucket is provided with external shell, described device for storing liquid includes two and is disposed side by side on frame rear, with impregnation bucket liquid storing barrel one to one;
Described tubing includes two water influent pipeline, two drain line, is connected by tubing between single described impregnation bucket and single described liquid storing barrel;
Two described impregnation buckets are jointly also connected with vacuum-pumping pipeline and pressure pipeline, described vacuum-pumping pipeline and pressure pipeline and are plugged in inside impregnation bucket by air line;
Described frame is provided with external shell elevating mechanism, and described external shell elevating mechanism is connected with the external shell of impregnation bucket.
2. capacitor high-pressure lifting impregnation equipment according to claim 1, it is characterized in that, described external shell includes lamina rara externa and inner plating, and described inner plating is provided externally with heating board, being provided with insulation material between described lamina rara externa and inner plating, the top of described impregnation bucket is provided with safety-valve.
3. capacitor high-pressure lifting impregnation equipment according to claim 2, it is characterized in that, described impregnation bucket is additionally provided with internal work portion, described internal work portion is provided with multiple impregnation dish load plate, discharge opeing linkage, plate draining valve and plate overflow mechanism, and multiple described impregnation dish load plate stacked on top of one another are arranged on inside impregnation bucket.
4. capacitor high-pressure lifting impregnation equipment according to claim 1, it is characterized in that, described liquid storing barrel is provided with inner plating and outside plate, it is provided with la m between described inner plating and outside plate, conduction oil is contained between la m and inner plating, being provided with insulation material between la m and outside plate, the bottom of liquid storing barrel is provided with heating element.
5. capacitor high-pressure lifting impregnation equipment according to claim 1, it is characterized in that, described external shell elevating mechanism includes the fluctuating orbit and the power generating apparatus that are arranged on frame sidepiece, described frame sidepiece is additionally provided with power transmission chain, described fluctuating orbit is provided with elevating oil cylinder, and described elevating oil cylinder is connected by contiguous block and external shell are fixing;
Described power generating apparatus connects described power transmission chain, and described power transmission chain connects described elevating oil cylinder.
6. capacitor high-pressure lifting impregnation equipment according to claim 1, it is characterised in that described external shell elevating mechanism also includes track retainer, described track retainer is arranged on the top of frame, connects and fixing described fluctuating orbit.
7. capacitor high-pressure lifting impregnation equipment according to claim 1, it is characterised in that described water influent pipeline is provided with filter, this filter is arranged between liquid storing barrel and impregnation bucket.
8. capacitor high-pressure lifting impregnation equipment according to claim 1, it is characterised in that it is additionally provided with vacuum equipment, and described vacuum equipment includes blowdown piping and valve, and this blowdown piping connects with air pipe line;
Described vacuum equipment also includes vacuum filter, and this vacuum filter is positioned close to liquid storing barrel side.
9. the impregnation method applying the described capacitor high-pressure lifting impregnation equipment of one of claim 1 to 8, it is characterised in that it comprises the following steps:
(1) dry fuse is riveted cover plate, it is thus achieved that riveted the capacitor semi-finished product of end cap;
(2) the capacitor semi-finished product of step (1) are placed in capacitor high-pressure lifting impregnation equipment and soak electrolyte, overfall height according to fuse altitude mixture control plate overflow mechanism, and set impregnation parameter, in impregnation process, it is ensured that electrolyte is not dipped into cover plate.
10. impregnation method according to claim 9, it is characterised in that described step (2) is specifically further comprising the steps of:
(21) setting of described capacitor semi-finished product being placed in basket and arrange each capacitor semi-finished product is level, in the impregnation dish load plate put into after being dried by basket;
(22) the overfall height according to fuse altitude mixture control plate overflow mechanism, locking impregnation equipment machine cylinder cap, locking closure is evacuation just, reach first evacuation setting pressure and after the time, liquid feed valve is opened, negative pressure in impregnation bucket is utilized to suck electrolyte, electrolyte passes through the nethermost impregnation dish load plate of overfall runner from uppermost impregnation dish load plate, finally it is flowed into the bottom of impregnation bucket, when liquid level reaches bottom high position induction apparatus, represent that feed liquor completes, liquid feed valve is closed, air bleeding valve is opened, when after air pressure balance, pressurizing valve is opened, when impregnation bucket internal gas pressure reaches discharge opeing pressure, tapping valve is opened, normal pressure in bucket is utilized to carry out discharge opeing, when liquid level decline reaches low level induction apparatus action, tapping valve is closed, air bleeding valve is opened, after pressure reaches balance, vacuum pumping valve is opened, start to be impregnated with the evacuation of cycle stage, after reaching Preset Time, start to supplement containing immersion, fluid infusion is balanced pressure after completing, balance pressure starts pressurization and pressurize after completing, it is balanced pressure after reaching preheating setting time, next circulation is carried out after completing, after reaching set point number until cycle-index, carry out impregnation dish load plate discharge opeing and impregnation bucket discharge opeing, after discharge opeing completes, alarm has been impregnated with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610162537.7A CN105655157B (en) | 2016-03-21 | 2016-03-21 | A kind of capacitor high-pressure lifting impregnation equipment and impregnation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610162537.7A CN105655157B (en) | 2016-03-21 | 2016-03-21 | A kind of capacitor high-pressure lifting impregnation equipment and impregnation method |
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| CN105655157A true CN105655157A (en) | 2016-06-08 |
| CN105655157B CN105655157B (en) | 2018-01-23 |
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| CN106229167A (en) * | 2016-09-14 | 2016-12-14 | 铜陵源丰电子有限责任公司 | A kind of sub-prime lifting type dipping device |
| CN107240512A (en) * | 2017-04-21 | 2017-10-10 | 南通星晨电子有限公司 | A kind of capacitor impregnation equipment |
| CN111564329A (en) * | 2020-04-28 | 2020-08-21 | 广东风华高新科技股份有限公司 | Capacitor impregnation method and capacitor impregnation device |
| CN113192770A (en) * | 2021-04-20 | 2021-07-30 | 贵阳立特精密机械有限公司 | Vacuum impregnation device |
| CN116013707A (en) * | 2022-12-20 | 2023-04-25 | 贵阳立特精密机械有限公司 | Automatic positive and negative pressure impregnation equipment and impregnation process |
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| CN116013707A (en) * | 2022-12-20 | 2023-04-25 | 贵阳立特精密机械有限公司 | Automatic positive and negative pressure impregnation equipment and impregnation process |
Also Published As
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|---|---|
| CN105655157B (en) | 2018-01-23 |
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