CN112474039A - Magnetic filtering device for transformer oil purification - Google Patents
Magnetic filtering device for transformer oil purification Download PDFInfo
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- CN112474039A CN112474039A CN202011204735.8A CN202011204735A CN112474039A CN 112474039 A CN112474039 A CN 112474039A CN 202011204735 A CN202011204735 A CN 202011204735A CN 112474039 A CN112474039 A CN 112474039A
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- shell
- transformer
- pipe
- filtering device
- extrusion ball
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
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Abstract
The invention discloses a magnetic filtering device for purifying transformer oil, which comprises a transformer shell and is characterized in that: an iron core is arranged in the transformer shell, a scraping and supplying device is arranged outside the iron core in a sliding manner, one side of the transformer shell is provided with a filtering device which comprises a filtering shell, an annular fixing frame is correspondingly arranged inside the filtering shell, the interior of the annular fixed frame is movably connected with a separation sieve plate fixed plate through a bearing, a separation sieve plate is embedded in the separation sieve plate fixed plate, sieve pores are arranged inside the separation sieve plate, the inner wall of each sieve pore is made of magnetic material, a gas dissolving pipe is arranged at the top of the filter shell in a penetrating way, the mouth of the air dissolving pipe is in a horn shape, the mouth of the air dissolving pipe is provided with an upper extrusion ball, the upper extrusion ball is contacted with the separation sieve plate fixing plate, one end of the gas dissolving pipe is connected with a pressure gas dissolving tank.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a magnetic filtering device for purifying transformer oil.
Background
The transformer oil and the oil-impregnated paper thereof are main insulating materials in the transformer, and play double roles of insulating and heat conducting. Therefore, the transformer oil needs to have high insulation strength in addition to good thermal conductivity. The iron core of the oil immersed transformer is formed by laminating silicon steel sheets with good magnetic conductivity, and forms a closed magnetic flow path.
In the daily use process of the transformer, the silicon steel sheet is soaked in oil for a long time, and with repeated power-on and power-off and daily use of the coil, a trace amount of the silicon steel sheet can be separated out and soaked in the oil in a particle state, because the outer layer of the steel sheet contains less silicon, the particle residues of the silicon steel sheet are easy to magnetize after the coil is electrified and keep the magnetism for a long time not to disappear, magnetic impurities can be suspended in the oil to influence the insulation effect of the silicon steel sheet, a small amount of the magnetic impurities can be easily adsorbed on the side wall of an element of the transformer to cause magnetic flux disorder, and can not be easily absorbed by an oil purifier, but the blockage of the pipe orifice of;
in addition, because complete air isolation cannot be achieved in the transformer, the surface silicon steel sheets and the micro water vapor in the air can be ionized under a high-pressure environment, so that the pit defect on the surface of the air end is caused, a slight disturbance phenomenon occasionally occurs during voltage transformation, and the voltage transformation effect of the transformer can be influenced.
Therefore, it is necessary to design a magnetic filtering device for purifying transformer oil with strong practicability and high transformation stability.
Disclosure of Invention
The invention aims to provide a magnetic filtering device for purifying transformer oil, which is used for solving the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: the utility model provides a transformer oil purification uses magnetic filter equipment, includes transformer housing, its characterized in that: the transformer comprises a transformer shell and is characterized in that an iron core is arranged inside the transformer shell, a scraping and supplying device is arranged outside the iron core in a sliding mode, and a filtering device is arranged on one side of the transformer shell.
According to the technical scheme, filter equipment is including filtering the shell, the inside correspondence of filtering the shell is provided with the fixed frame of annular, there is separation sieve fixed plate inside of the fixed frame of annular through bearing swing joint, the inside embedding of separation sieve fixed plate has the separation sieve, the sieve mesh has been seted up to the inside of separation sieve, the inner wall of sieve mesh is the magnetism material.
According to the technical scheme, the top of filtering the shell is run through and is provided with the dissolved air pipe, the mouth of pipe of dissolved air pipe is loudspeaker form, the mouth of pipe of dissolved air pipe is provided with the extrusion ball, go up the extrusion ball and contact with separation sieve fixed plate, the one end of dissolved air pipe is connected with pressure dissolved air tank, be provided with pressure transmitter and governing valve on the dissolved air pipe.
According to the technical scheme, the bottom of the filter shell is correspondingly provided with a flocculant pipe in a penetrating mode, the pipe opening of the flocculant pipe is in a horn shape, a lower extrusion ball is arranged at the pipe opening of the flocculant pipe, the two sides of the separation sieve plate fixing plate are fixed with cross bars in an annular welding mode, the cross bars are in contact with the lower extrusion ball, one end of the flocculant pipe is in through connection with a meshed flocculant tank, a hydraulic driving plate is arranged on the flocculant pipe in a rotating mode, the middle of the hydraulic driving plate is connected with a rotating shaft, Roots blades are sleeved outside the rotating shaft, a pump shell is arranged outside the Roots blades, and the pump shell is in through connection with the meshed flocculant tank.
According to the technical scheme, the hydraulic drive plate is composed of a first drive plate and a second drive plate, the first drive plate is flush with the right end of the separation sieve plate fixing plate, and the second drive plate is flush with the left end of the separation sieve plate fixing plate.
According to the technical scheme, hydraulic oil is filled in the transformer shell, the density of the upper extrusion ball is smaller than that of the hydraulic oil, and the density of the lower extrusion ball is larger than that of the hydraulic oil.
According to the technical scheme, strike off replenishing device and include that a plurality of is the fan-shaped liquid bag that the circumference form distributes, the one end of fan-shaped liquid bag is inwards sunken to be provided with the internal contraction angle, soft magnet has been laid on average on the surface of fan-shaped liquid bag, one side of fan-shaped liquid bag is provided with the liquid bag, the inside sliding connection of liquid bag has gas baffle, gas baffle's middle part is provided with the pars contractilis, the both sides correspondence of liquid bag is provided with the gyro wheel, the outside winding of gyro wheel has the spiral spring, the one end of spiral spring is connected with gas baffle, the one end of liquid bag is connected with the valve.
According to the technical scheme, square grooves are formed in two sides of the fan-shaped liquid bag, contact wheels are evenly connected to the inner portions of the square grooves through bearings, and the contact wheels are in contact with the iron core.
According to the technical scheme, the fluted disc is arranged outside the filter shell, the motor is installed on one side of the transformer shell, and the gear shaft of the motor is meshed with the fluted disc.
According to the technical scheme, the surfaces of the upper extrusion ball and the lower extrusion ball are made of rubber, and the pipe orifices of the gas dissolving pipe and the flocculating agent pipe are provided with anti-skid grains.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the scraping and supplying device is arranged, so that the separated part of the silicon-containing iron core can be scraped, the incomplete part of the silicon-containing iron core is supplemented, the iron core is always in a regular shape, and the stability of voltage transformation is maintained; through being provided with filter equipment, adsorb the filtration to magnetic impurities in normal time, add the flocculating agent when blockking up and get rid of magnetic impurities, let in pressure when needs carry out big washing to oil and dissolve gas, three kinds of forms filter transformer oil, have played better filter effect.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the scraping replenishment device of the present invention;
FIG. 3 is a schematic view of the installation of the fluid infusion bag and the fan-shaped fluid bag of the present invention;
FIG. 4 is a schematic view of a partial structure of the filter device of the present invention;
FIG. 5 is a schematic diagram of the flocculation state principle of the filter shell of the present invention;
FIG. 6 is a schematic diagram of the filter housing of the present invention in a centrifugal state;
FIG. 7 is a schematic view of the filter housing of the present invention in a filtration state;
in the figure: 1. a transformer housing; 2. an iron core; 3. a scraping and supplying device; 4. a filtration device; 31. a fan-shaped liquid sac; 32. a fluid infusion bag; 311. a square groove; 312. a contact wheel; 313. the angle is retracted; 321. a gas baffle; 322. a telescopic part; 323. a valve; 324. a roller; 325. a volute spiral spring; 41. a pressure dissolved air tank; 42. a mesh flocculant tank; 43. a gas dissolving pipe; 431. an upper extrusion ball; 432. adjusting a valve; 433. a pressure transmitter; 44. a flocculant pipe; 441. a lower extrusion ball; 45. an annular fixed frame; 451. a rail bar; 452. separating the sieve plate fixing plate; 453. separating the sieve plate; 46. a filter shell; 47. a hydraulic drive plate; 48. roots leaves; 481. a pump housing.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-7, the present invention provides the following technical solutions: the utility model provides a transformer oil purification uses magnetic filter equipment, includes transformer housing 1, its characterized in that: an iron core 2 is installed inside a transformer shell 1, a scraping and supplying device 3 is slidably arranged outside the iron core 2, a filtering device 4 is arranged on one side of the transformer shell 1, the filtering device 4 is used for filtering pressure oil in the transformer shell 1 and keeping the interior of the transformer clean, the transformer does not need to be manually opened to pump out all the oil for cleaning, manpower is saved, the scraping and supplying device 3 is used for scraping magnetized micro silicon steel sheet impurities on the surface of the iron core 2 and supplying pit defects after ionization, and stability of voltage transformation is maintained;
the filtering device 4 comprises a filtering shell 46, an annular fixing frame 45 is correspondingly arranged inside the filtering shell 46, a separating sieve plate fixing plate 452 is movably connected inside the annular fixing frame 45 through a bearing, a separating sieve plate 453 is embedded inside the separating sieve plate fixing plate 452, sieve holes are formed inside the separating sieve plate 453, the inner walls of the sieve holes are made of magnetic materials, when filtering is started, firstly, oil in the transformer shell 1 is introduced into the filtering shell 46, the oil can continuously leak out of the sieve holes when passing through the separating sieve plate 453, and meanwhile, magnetic impurities and other granular or blocky impurities can be throttled inside the sieve holes so as to filter the transformer oil, so that the purity of the transformer oil is maintained;
the top of the filtering shell 46 is provided with a dissolved air pipe 43 in a penetrating way, the mouth of the dissolved air pipe 43 is in a horn shape, the mouth of the dissolved air pipe 43 is provided with an upper extrusion ball 431, the upper extrusion ball 431 is in contact with the separating sieve plate fixing plate 451, one end of the dissolved air pipe 43 is connected with a pressure dissolved air tank 41, the dissolved air pipe 43 is provided with a pressure transmitter 433 and a regulating valve 432, the pressure dissolved air tank 41 continuously introduces pressure dissolved air into the dissolved air pipe 43 under normal conditions, the dissolved air diffuses and adsorbs small particle impurities which can pass through sieve holes and drive the pressure oil upwards due to the smaller pressure intensity in the filtering shell 46, the top of the filtering shell 46 is preferably provided with an exhaust pipe for absorbing bubbles carrying impurities, when the impurities accumulated on the separating sieve plate accumulate to a certain degree, the sieve holes are blocked, and the friction force formed by the upper extrusion ball 431 and the dissolved air pipe 43 is overcome and pushes the separating sieve plate fixing plate 452 to rotate to a position of 90 degrees due, when the separation sieve plate fixing plate 452 is inclined, the upper extrusion balls 431 lose blocking force, a large amount of dissolved gas can be sprayed downwards, the separation sieve plate 453 is vibrated violently, magnetic impurities which are not contained in sieve holes are shaken off and taken away upwards, the magnetic impurities are still adsorbed inside the sieve holes, separation of the magnetic impurities and non-magnetic impurities is facilitated, the separation sieve plate 453 gradually returns to the original position along with the recovery of the sieve holes, meanwhile, the pressure transmitter 433 senses reduction of pressure, the regulating valve 432 is driven to reduce the opening degree of the separation sieve plate, the upper extrusion balls 431 float upwards, the upper extrusion balls 431 are extruded upwards, the amount of gas sprayed out of the pipe opening of the gas dissolving pipe 43 is reduced, switching between two working modes is facilitated, and the intake of the dissolved gas is saved;
the bottom of the filter shell 46 is correspondingly provided with a flocculant pipe 44 in a penetrating way, the pipe orifice of the flocculant pipe 44 is in a horn shape, the pipe orifice of the flocculant pipe 44 is provided with a lower extrusion ball 441, two sides of a separation sieve plate fixing plate 452 are fixedly welded with crosspieces 451 in an annular shape, the crosspieces 451 are in contact with the lower extrusion ball 441, one end of the flocculant pipe 44 is in a penetrating way connected with a reticular flocculant tank 42, the flocculant pipe 44 is rotatably provided with a hydraulic drive plate 47, the middle part of the hydraulic drive plate 47 is connected with a rotating shaft, the outer part of the rotating shaft is sleeved with Roots blades 48, the outer part of the Roots blades 48 is provided with a pump shell 481, the pump shell 481 is in a penetrating way connected with the reticular flocculant tank 42, when the flocculant is accumulated to a certain degree, the separation sieve plate 453 deflects, the lower extrusion ball 441 is in contact with the crosspiec, the rotating shaft rotates and extrudes the reticular flocculant upwards until the meshes of the separation sieve plate 453, and the magnetic impurities are separated from the inner walls of the meshes by the viscosity of the flocculant, so that the magnetic impurities are completely recovered;
the hydraulic drive plate 47 is composed of a first drive plate and a second drive plate, the first drive plate is flush with the right end of the separation sieve plate fixing plate 452, the second drive plate is flush with the left end of the separation sieve plate fixing plate 452, the first drive plate is driven by hydraulic power to rotate clockwise when the first drive plate starts to rotate, forward pumping is started, the second drive plate can rotate to 135 degrees when the second drive plate finishes clearing, at the moment, the lower extrusion ball 441 is clamped with the crosspiece 451 again, the second drive plate is driven by hydraulic power to rotate in the reverse direction, and the Roots blades 48 rotate in the reverse direction, so that the flocculant is sucked back to the original position;
the transformer casing 1 is filled with hydraulic oil, the density of the upper extrusion ball 431 is smaller than that of the hydraulic oil, the density of the lower extrusion ball 441 is larger than that of the hydraulic oil, the upper extrusion ball 431 moves upwards to be attached to the top of the upper extrusion ball 431 when liquid pumping is finished, leakage of the transformer oil is prevented, and the lower extrusion ball 441 also prevents the hydraulic oil from leaking in when a flocculating agent does not overflow;
the scraping and supplying device 3 comprises a plurality of fan-shaped liquid bags 31 distributed in a circumferential shape, one end of each fan-shaped liquid bag 31 is inwards recessed to form an inward-shrinking angle 313, soft magnets are evenly paved on the surface of each fan-shaped liquid bag 31, one side of each fan-shaped liquid bag 31 is provided with a liquid supplementing bag 32, the inside of each liquid supplementing bag 32 is connected with a gas baffle 321 in a sliding manner, the middle of each gas baffle 321 is provided with a telescopic part 322, two sides of each liquid supplementing bag 32 are correspondingly provided with rollers 324, a scroll spring 325 is wound outside each roller 324, one end of each scroll spring 325 is connected with the corresponding gas baffle 321, one end of each liquid supplementing bag 32 is connected with a valve 323, when the iron core 2 needs to be supplied, a ball screw lifting platform is preferably arranged at the position of each fan-shaped liquid bag 31, the upward and downward lifting can be realized, the whole iron core 2 is convenient to be treated, when the iron core is scraped, the, scraping is carried out, meanwhile, impurities are brought into pits when the surface of the fan-shaped liquid bag 31 and the surface of the iron core 2 rub to form filling of the pits on the surface, and because the valve 323 can bring a small amount of iron core 2 particles into the surface of the retracted angle 313 when liquid is pumped to the fan-shaped liquid bag 31, the iron core 2 particles separated from the transformer oil can be collected, when the radius of the iron core 2 in the length direction is not constant due to the fact that the voltage transformation needs to be changed, the extended length of the retracted angle 313 can be changed by pumping the liquid, the scroll spring 325 is more suitable for occasions with different diameters, and the fan-shaped liquid bag 31 can be in contact with the iron core 2 all the time to form extrusion force;
a fluted disc is arranged outside the filter shell 46, a motor is arranged on one side of the transformer shell 1, a gear shaft of the motor is meshed with the fluted disc, when impurities in the filter shell 46 need to be centrifugally separated, the motor is started, an output shaft of the motor drives the fluted disc to rotate, then the filter shell 46 rotates and centrifuges hydraulic oil, the impurities are thrown to the centers of the two separation sieve plates 453, a large amount of pump liquid is carried out on a pipeline at the moment, the impurities are extruded by a middle seam of the two separation sieve plates 453 to form blocky precipitates which are deposited below, and an accommodating groove is preferably formed at the bottom of the filter shell 46 and used for accommodating the impurities;
the surfaces of the upper extrusion ball 431 and the lower extrusion ball 441 are made of rubber, and the pipe openings of the gas dissolving pipe 43 and the flocculant pipe 44 are provided with anti-slip lines which are used for preventing the upper extrusion ball 431 and the lower extrusion ball 441 from sliding with the inner walls of the gas dissolving pipe 43 and the flocculant pipe 44 and preventing gas or flocculant from leaking in an unused state.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a transformer oil purification uses magnetic filter equipment, includes transformer housing (1), its characterized in that: the transformer comprises a transformer shell (1) and is characterized in that an iron core (2) is installed inside the transformer shell (1), a scraping and supplying device (3) is arranged outside the iron core (2) in a sliding mode, and a filtering device (4) is arranged on one side of the transformer shell (1).
2. The magnetic filtering device for purifying transformer oil according to claim 1, wherein: filter equipment (4) are including filtering shell (46), the inside correspondence of filtering shell (46) is provided with the fixed frame of annular (45), there is separation sieve fixed plate (452) inside of the fixed frame of annular (45) through bearing swing joint, the inside embedding of separation sieve fixed plate (452) has separation sieve (453), the sieve mesh has been seted up to the inside of separation sieve (453), the inner wall of sieve mesh is the magnetism material.
3. The magnetic filtering device for purifying transformer oil according to claim 2, wherein: the top of crossing of filter shell (46) is provided with dissolved air pipe (43), the mouth of pipe of dissolved air pipe (43) is loudspeaker form, the mouth of pipe of dissolved air pipe (43) is provided with extrusion ball (431), it contacts with separation sieve fixed plate (451) to go up extrusion ball (431), the one end of dissolved air pipe (43) is connected with pressure dissolved air tank (41), be provided with pressure transmitter (433) and governing valve (432) on dissolved air pipe (43).
4. The magnetic filtering device for purifying transformer oil according to claim 3, wherein: the bottom of the filter shell (46) is correspondingly provided with a flocculant pipe (44) in a penetrating mode, the pipe orifice of the flocculant pipe (44) is in a horn shape, a lower extrusion ball (441) is arranged at the pipe orifice of the flocculant pipe (44), transverse bars (451) are welded and fixed on two sides of the separation sieve plate fixing plate (452) in an annular mode, the transverse bars (451) are in contact with the lower extrusion ball (441), one end of the flocculant pipe (44) is in through connection with a meshed flocculant tank (42), a hydraulic drive plate (47) is arranged on the flocculant pipe (44) in a rotating mode, the middle of the hydraulic drive plate (47) is connected with a rotating shaft, a Roots blade (48) is sleeved outside the rotating shaft, a pump shell (481) is arranged outside the Roots blade (48), and the pump shell (481) is in through connection with the meshed flocculant tank (.
5. The magnetic filtering device for purifying transformer oil according to claim 4, wherein: the hydraulic drive plate (47) is composed of a first drive plate and a second drive plate, the first drive plate is flush with the right end of the separation sieve plate fixing plate (452), and the second drive plate is flush with the left end of the separation sieve plate fixing plate (452).
6. The magnetic filtering device for purifying transformer oil of claim 5, wherein: the transformer comprises a transformer shell (1), and is characterized in that hydraulic oil is filled in the transformer shell (1), the density of an upper extrusion ball (431) is smaller than that of the hydraulic oil, and the density of a lower extrusion ball (441) is larger than that of the hydraulic oil.
7. The magnetic filtering device for purifying transformer oil of claim 6, wherein: strike off replenishing device (3) and be fan-shaped liquid bag (31) that the circumference form distributes including a plurality of, the one end of fan-shaped liquid bag (31) is inwards sunken to be provided with interior reentrant angle (313), soft magnet has been laid on average on the surface of fan-shaped liquid bag (31), one side of fan-shaped liquid bag (31) is provided with fluid infusion bag (32), the inside sliding connection of fluid infusion bag (32) has gas baffle (321), the middle part of gas baffle (321) is provided with pars contractilis (322), the both sides correspondence of fluid infusion bag (32) is provided with gyro wheel (324), the outside winding of gyro wheel (324) has scroll spring (325), the one end of scroll spring (325) is connected with gas baffle (321), the one end of fluid infusion bag (32) is connected with valve (323).
8. The magnetic filtering device for purifying transformer oil according to claim 7, wherein: the two sides of the fan-shaped liquid bag (31) are provided with square grooves (311), the inside of each square groove (311) is evenly connected with a contact wheel (312) through a bearing, and the contact wheels (312) are in contact with the iron core (2).
9. The magnetic filtering device for purifying transformer oil according to claim 8, wherein: the outside of crossing filter shell (46) is provided with the fluted disc, the motor is installed to one side of transformer casing (1), the gear shaft and the fluted disc mesh of motor mutually.
10. The magnetic filtering device for purifying transformer oil of claim 9, wherein: the surfaces of the upper extrusion ball (431) and the lower extrusion ball (441) are made of rubber, and the openings of the gas dissolving pipe (43) and the flocculating agent pipe (44) are provided with anti-skid grains.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011204735.8A CN112474039B (en) | 2020-11-02 | 2020-11-02 | Magnetic filtering device for purifying transformer oil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011204735.8A CN112474039B (en) | 2020-11-02 | 2020-11-02 | Magnetic filtering device for purifying transformer oil |
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| CN112474039A true CN112474039A (en) | 2021-03-12 |
| CN112474039B CN112474039B (en) | 2022-10-28 |
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| CN113446281A (en) * | 2021-07-22 | 2021-09-28 | 山东弘宇农机股份有限公司 | Lifter distributor for tractor |
| CN116864278A (en) * | 2023-06-27 | 2023-10-10 | 国网湖北省电力有限公司电力科学研究院 | On-load capacity-regulating voltage-regulating tap switch of transformer |
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