CN112201462A - Special tool for multipoint vacuum pumping of super-huge transformer - Google Patents
Special tool for multipoint vacuum pumping of super-huge transformer Download PDFInfo
- Publication number
- CN112201462A CN112201462A CN202010894398.3A CN202010894398A CN112201462A CN 112201462 A CN112201462 A CN 112201462A CN 202010894398 A CN202010894398 A CN 202010894398A CN 112201462 A CN112201462 A CN 112201462A
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- chamber cavity
- protective shell
- air chamber
- box cover
- pipe
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
The multipoint vacuumizing special tool for the extra-large transformer comprises a gas chamber cavity, wherein a plurality of vacuumizing pipes are arranged on the upper part of the gas chamber cavity, and the multipoint vacuumizing special tool is characterized in that: the protection shell is additionally arranged outside the air chamber cavity, on one hand, the protection shell can facilitate the air chamber cavity to enter the protection shell through the through groove, on the other hand, the protection shell can play a protection role for the air chamber cavity, the air chamber cavity is prevented from being directly impacted by the outside, and the stability of the air chamber cavity is prevented from being influenced by the depression of the air chamber cavity caused by impact.
Description
Technical Field
The invention relates to a special tool, in particular to a special tool for multipoint vacuum pumping of an extra-large transformer.
Background
Publication No.: CN204242752U discloses an air chamber for converter transformer vacuum pumping, and we find in application that, in the use process of the air chamber for converter transformer vacuum pumping, when the air chamber cavity is impacted by external force, depressions are generated on the surface, and after vacuum pumping, the depressions may affect the stability of the whole air chamber cavity, and may seriously cause the damage of the air chamber cavity under the vacuum action.
Disclosure of Invention
The invention aims to provide a special tool for multipoint vacuum pumping of an extra-large transformer, which can play a role in protecting a gas chamber cavity, prevent the gas chamber cavity from being directly impacted by the outside and prevent the stability of the gas chamber cavity from being influenced by depression generated by impact on the gas chamber cavity.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the multipoint vacuumizing special tool for the extra-large transformer comprises a gas chamber cavity, wherein a plurality of vacuumizing pipes are arranged on the upper part of the gas chamber cavity, and the multipoint vacuumizing special tool is characterized in that: the protective casing is arranged on the air chamber cavity, the protective casing is a cylindrical casing with an opening in the bottom surface, a plurality of supports are connected to the bottom of the inner side of the protective casing, the air chamber cavity is arranged inside the protective casing, the bottom of the air chamber cavity is matched with the supports, a through groove is formed in the upper portion of the protective casing, the vacuumizing pipe can penetrate through the through groove, a case cover is arranged at the opening portion of the protective casing, and the case cover can seal the opening of the protective casing.
In order to further realize the purpose of the invention, the following technical scheme can be adopted: the upper part of the protective shell is provided with a vacuum tube locking device, the vacuum tube locking device comprises a guide rod, two ends of the guide rod are connected with the outer side of the upper part of the protective shell, a plurality of sliding locking devices are arranged on the guide rod, the sliding locking device comprises a sliding pipe, the sliding pipe is sleeved on the guide rod and can slide on the guide rod, a screw hole is formed in one side of the sliding pipe, the sliding pipe is connected with a first bolt through screw threads, the guide rod and the sliding pipe can be locked through the first bolt, the extension rod is connected to the other side of the sliding pipe, a spring clamp is connected to one side of the extension rod and is of a U-shaped plate-shaped structure, the spring clamp can clamp the vacuumizing pipe through elastic force, a screw hole is formed in one side of the spring clamp, the spring clamp is connected with a second bolt through screw threads, and the end portion of a lead screw of the second bolt can be matched with the vacuumizing pipe.
The upper portion of support is seted up the arc wall, and the direction of arc wall arc is downward, connects third foaming latex pad on the arc wall, and third foaming latex pad cooperates with the bottom of air chamber cavity.
The bottom of the protective shell is connected with the base.
The box cover is of a tubular structure with one end sealed, internal threads are formed on the side circumference of the inner wall of the box cover, external threads are formed on the outer side of the protective shell, and the box cover is connected with the protective shell through threads.
The protection casing is characterized in that one side of the inside of the protection casing is connected with a first foamed latex pad, one side of the inside of the case cover is connected with a second foamed latex pad, and the first foamed latex pad and the second foamed latex pad can be matched to clamp the air chamber cavity.
The invention has the advantages that: according to the invention, the protective shell is additionally arranged outside the air chamber cavity, so that the air chamber cavity can conveniently enter the protective shell through the through groove on one hand, and the protective shell can play a protective role for the air chamber cavity on the other hand, the air chamber cavity is prevented from being directly impacted by the outside, and the stability of the air chamber cavity is prevented from being influenced by the depression of the air chamber cavity caused by impact. The box cover and the protective shell can form a surrounding structure for the air chamber cavity, so that the protective performance for the air chamber cavity is improved. When the air chamber cavity is installed and enters the protective shell, the through groove can facilitate the insertion and matching of the vacuumizing pipe and the through groove, so that the air chamber cavity can conveniently enter the protective shell.
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 structural view of the present invention;
FIG. 2 is an enlarged view of the structure of FIG. 1 from direction A;
fig. 3 is a schematic view of an enlarged structure in the direction B of fig. 1.
Labeling components: 1 vacuum tube 2, first foam latex pad 3, air chamber cavity 4, support 5, protective shell 6, base 7, guide rod 8, spring clamp 9, through groove 10, second foam latex pad 11, cover 12, first bolt 13, sliding tube 14, extension rod 15, second bolt 16, arc groove 17 and third foam latex pad.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
Example 1:
the multipoint vacuum-pumping special tool for the super-huge type transformer is shown in figures 1-3 and comprises a gas chamber cavity 3, wherein a plurality of vacuum-pumping pipes 1 are arranged on the upper part of the gas chamber cavity 3, and the multipoint vacuum-pumping special tool is characterized in that: the air chamber cavity 3 is provided with a protective shell 5, the protective shell 5 is a cylindrical shell with an opening on the bottom surface, the bottom of the inner side of the protective shell 5 is connected with a plurality of supports 4, the air chamber cavity 3 is arranged inside the protective shell 5, the bottom of the air chamber cavity 3 is matched with the supports 4, the upper portion of the protective shell 5 is provided with a through groove 9, the vacuum tube 1 can penetrate through the through groove 9, the opening portion of the protective shell 5 is provided with a box cover 11, and the box cover 11 can seal the opening of the protective shell 5.
According to the invention, the protective shell 5 is additionally arranged outside the air chamber cavity 3, on one hand, the protective shell 5 can facilitate the air chamber cavity 3 to enter the protective shell 5 through the through groove 9, on the other hand, the protective shell can play a protective role for the air chamber cavity 3, the air chamber cavity 3 is prevented from being directly impacted by the outside, and the air chamber cavity 3 is prevented from being influenced by the depression generated by the impact on the air chamber cavity 3. The box cover 11 of the invention and the protective shell 5 can form a surrounding structure for the air chamber cavity 3, thereby improving the protective performance for the air chamber cavity 3. The through groove 9 can facilitate the insertion and matching of the vacuumizing tube 1 and the through groove 9 when the air chamber cavity 3 is installed and enters the protective shell 5, so that the air chamber cavity 3 can conveniently enter the protective shell 5.
Material selection and feasibility analysis of specific implementation of application range: the practical manufactured sample is implemented by taking the specification attached drawing as a drawing according to the proportion and the matching mode of each part in the specification attached drawing, the connection is a common connection mode such as a connection of a strong adhesive, a welding, riveting and a flange connection and an integral forming type connection, and the thickness and the strength of a corresponding connection mode connection point can be selected without creativity according to the requirement of practical connection strength during practical manufacturing. When entering into protective housing 5's inside with the installation of air chamber cavity 3, the user can hand evacuation pipe 1 and then air chamber cavity 3 perhaps utilizes the bandage to bind air chamber cavity 3, hand bandage drive air chamber cavity 3 enter into protective housing 5's inside, it is higher than support 4 to keep air chamber cavity 3, make things convenient for the oil drain valve of air chamber cavity 3 bottom to pass through the upper portion of support 4, after air chamber cavity 3 arrived the target mounting position, the user can put air chamber cavity 3 on support 4, then utilize case lid 11 to seal one side opening of protective housing 5. A through hole can be formed in the position corresponding to the oil drain valve in order that the oil drain valve at the bottom of the air chamber cavity 3 is connected with the bottom of the external pipeline protection shell 5, and after the air chamber cavity 3 is installed, an external pipeline penetrates through the through hole to be communicated with an outlet of the oil drain valve. The air chamber cavity 3 can adopt the published number: CN204242752U air chamber for converter transformer vacuum pumping, publication no: the CN204242752U air chamber for vacuumizing the converter transformer further comprises an air chamber cavity; a converter transformer vacuum tube; vacuumizing a tube; a valve; an oil discharge pipe; an oil discharge valve; an oil level gauge; a channel steel bar; a base.
Example 2:
the multipoint vacuum-pumping special tool for the super-huge type transformer is shown in figures 1-3 and comprises a gas chamber cavity 3, wherein a plurality of vacuum-pumping pipes 1 are arranged on the upper part of the gas chamber cavity 3, and the multipoint vacuum-pumping special tool is characterized in that: the air chamber cavity 3 is provided with a protective shell 5, the protective shell 5 is a cylindrical shell with an opening on the bottom surface, the bottom of the inner side of the protective shell 5 is connected with a plurality of supports 4, the air chamber cavity 3 is arranged inside the protective shell 5, the bottom of the air chamber cavity 3 is matched with the supports 4, the upper portion of the protective shell 5 is provided with a through groove 9, the vacuum tube 1 can penetrate through the through groove 9, the opening portion of the protective shell 5 is provided with a box cover 11, and the box cover 11 can seal the opening of the protective shell 5. A vacuum tube locking device is arranged at the upper part of the protective shell 5, the vacuum tube locking device comprises a guide rod 7, both ends of the guide rod 7 are connected with the outer side of the upper part of the protective shell 5, a plurality of sliding locking devices are arranged on the guide rod 7, the sliding locking device comprises a sliding pipe 13, the sliding pipe 13 is sleeved on the guide rod 7, the sliding pipe 13 can slide on the guide rod 7, a screw hole is formed in one side of the sliding pipe 13, the sliding pipe 13 is connected with a first bolt 12 through screw threads, the guide rod 7 and the sliding pipe 13 can be locked by the first bolt 12, the extension rod 14 is connected to the other side of the sliding pipe 13, a spring clamp 8 is connected to one side of the extension rod 14, the spring clamp 8 is of a U-shaped plate structure, the spring clamp 8 can clamp the vacuumizing pipe 1 through elastic force, the screw hole is formed in one side of the spring clamp 8, the spring clamp 8 is connected with a second bolt 15 through screw threads, and the end portion of a screw rod of the second bolt 15 can be matched with the vacuumizing pipe 1.
According to the vacuum tube locking device, after the air chamber cavity 3 is installed and enters the protective shell 5, the spring clamp 8 is manually controlled to clamp the vacuum tube 1 at the corresponding position, and the second bolt 15 is used for forcibly locking the vacuum tube 1 and the spring clamp 8, so that the relative position between the vacuum tube 1 and the protective shell 5 is prevented from being easily changed, and the stability of the air chamber cavity 3 is improved. During specific use, the sliding pipe 13 horizontally slides on the guide rod 7, after the vacuumizing pipe 1 and the air chamber cavity 3 reach the installation position, the sliding pipe 13, the extension rod 14 and the spring clamp 8 can slide to the right side of the target vacuumizing pipe 1, then the sliding pipe 13 is rotated to enable the extension rod 14 and the spring clamp 8 to penetrate through the gap between every two adjacent vacuumizing pipes 1, after the spring clamp 8 reaches the right side of the vacuumizing pipe 1, a user can push the sliding pipe 13 to slide on the left side, the spring clamp 8 is sleeved on the vacuumizing pipe 1, then the second bolt 15 is used for accident announcement of locking of the spring clamp 8 and the vacuumizing pipe 1, and then the first bolt 12 is screwed down.
Example 3:
the multipoint vacuum-pumping special tool for the super-huge type transformer is shown in figures 1-3 and comprises a gas chamber cavity 3, wherein a plurality of vacuum-pumping pipes 1 are arranged on the upper part of the gas chamber cavity 3, and the multipoint vacuum-pumping special tool is characterized in that: the air chamber cavity 3 is provided with a protective shell 5, the protective shell 5 is a cylindrical shell with an opening on the bottom surface, the bottom of the inner side of the protective shell 5 is connected with a plurality of supports 4, the air chamber cavity 3 is arranged inside the protective shell 5, the bottom of the air chamber cavity 3 is matched with the supports 4, the upper portion of the protective shell 5 is provided with a through groove 9, the vacuum tube 1 can penetrate through the through groove 9, the opening portion of the protective shell 5 is provided with a box cover 11, and the box cover 11 can seal the opening of the protective shell 5. An arc-shaped groove 16 is formed in the upper portion of the support 4, the arc direction of the arc-shaped groove 16 is downward, a third foam latex cushion 17 is connected to the arc-shaped groove 16, and the third foam latex cushion 17 is matched with the bottom of the air chamber cavity 3.
The arc-shaped groove 16 of the invention can be attached to the bottom contour of the air chamber cavity 3, and the air chamber cavity 3 is prevented from easily shaking on the bracket 4. The third foam latex pad 17 of the invention can buffer the air chamber cavity 3 and the bracket 4, and avoid the bracket 4 and the spring clamp 8 from generating rigid collision easily.
Example 4:
the multipoint vacuum-pumping special tool for the super-huge type transformer is shown in figures 1-3 and comprises a gas chamber cavity 3, wherein a plurality of vacuum-pumping pipes 1 are arranged on the upper part of the gas chamber cavity 3, and the multipoint vacuum-pumping special tool is characterized in that: the air chamber cavity 3 is provided with a protective shell 5, the protective shell 5 is a cylindrical shell with an opening on the bottom surface, the bottom of the inner side of the protective shell 5 is connected with a plurality of supports 4, the air chamber cavity 3 is arranged inside the protective shell 5, the bottom of the air chamber cavity 3 is matched with the supports 4, the upper portion of the protective shell 5 is provided with a through groove 9, the vacuum tube 1 can penetrate through the through groove 9, the opening portion of the protective shell 5 is provided with a box cover 11, and the box cover 11 can seal the opening of the protective shell 5. The bottom of the protective shell 5 is connected with a base 6.
The base 6 of the present invention can improve the stability of the protective housing 5.
Example 5:
the multipoint vacuum-pumping special tool for the super-huge type transformer is shown in figures 1-3 and comprises a gas chamber cavity 3, wherein a plurality of vacuum-pumping pipes 1 are arranged on the upper part of the gas chamber cavity 3, and the multipoint vacuum-pumping special tool is characterized in that: the air chamber cavity 3 is provided with a protective shell 5, the protective shell 5 is a cylindrical shell with an opening on the bottom surface, the bottom of the inner side of the protective shell 5 is connected with a plurality of supports 4, the air chamber cavity 3 is arranged inside the protective shell 5, the bottom of the air chamber cavity 3 is matched with the supports 4, the upper portion of the protective shell 5 is provided with a through groove 9, the vacuum tube 1 can penetrate through the through groove 9, the opening portion of the protective shell 5 is provided with a box cover 11, and the box cover 11 can seal the opening of the protective shell 5. The box cover 11 is of a tubular structure with one end sealed, internal threads are formed on the side circumference of the inner wall of the box cover 11, external threads are formed on the outer side of the protective shell 5, and the box cover 11 is connected with the protective shell 5 through threads.
The box cover 11 of the present invention is screwed to the protective case 5 to improve the stability of the box cover 11 and the protective case 5.
Example 6:
the multipoint vacuum-pumping special tool for the super-huge type transformer is shown in figures 1-3 and comprises a gas chamber cavity 3, wherein a plurality of vacuum-pumping pipes 1 are arranged on the upper part of the gas chamber cavity 3, and the multipoint vacuum-pumping special tool is characterized in that: the air chamber cavity 3 is provided with a protective shell 5, the protective shell 5 is a cylindrical shell with an opening on the bottom surface, the bottom of the inner side of the protective shell 5 is connected with a plurality of supports 4, the air chamber cavity 3 is arranged inside the protective shell 5, the bottom of the air chamber cavity 3 is matched with the supports 4, the upper portion of the protective shell 5 is provided with a through groove 9, the vacuum tube 1 can penetrate through the through groove 9, the opening portion of the protective shell 5 is provided with a box cover 11, and the box cover 11 can seal the opening of the protective shell 5. First foaming latex pad 2 is connected to inside one side of protection casing 5, and second foaming latex pad 10 is connected to inside one side of case lid 11, and air chamber cavity 3 can be cliied in the cooperation of first foaming latex pad 2 and second foaming latex pad 10.
The first foamed latex cushion 2 and the second foamed latex cushion 10 can be matched with each other to clamp the air chamber cavity 3, so that the air chamber cavity 3 is prevented from horizontal shaking easily, and the stability of the air chamber cavity 3 is further improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention.
Claims (4)
1. Super-huge transformer multiple spot evacuation specialized tool, including air chamber cavity (3), several evacuation pipe (1) of air chamber cavity (3) upper portion installation, its characterized in that: the vacuum tube locking device is characterized in that a protective shell (5) is arranged on the air chamber cavity (3), the protective shell (5) is a cylindrical shell with an opening in the bottom surface, a plurality of supports (4) are connected to the bottom of the inner side of the protective shell (5), the air chamber cavity (3) is arranged inside the protective shell (5), the bottom of the air chamber cavity (3) is matched with the supports (4), a through groove (9) is formed in the upper portion of the protective shell (5), a vacuum tube (1) can penetrate through the through groove (9), a box cover (11) is arranged at the opening portion of the protective shell (5), the box cover (11) can seal the opening of the protective shell (5), a vacuum tube locking device is arranged on the upper portion of the protective shell (5) and comprises a guide rod (7), two ends of the guide rod (7) are connected with the outer side of the upper portion of the protective shell (5), and a plurality of sliding locking devices are arranged, the sliding locking device comprises a sliding pipe (13), the sliding pipe (13) is sleeved on a guide rod (7), the sliding pipe (13) can slide on the guide rod (7), one side of the sliding pipe (13) is provided with a screw hole, the sliding pipe (13) is in threaded connection with a first bolt (12) through the screw hole, the guide rod (7) and the sliding pipe (13) can be locked by the first bolt (12), the other side of the sliding pipe (13) is connected with an extension rod (14), one side of the extension rod (14) is connected with a spring clamp (8), the spring clamp (8) is in a U-shaped plate structure, the spring clamp (8) can clamp the vacuumizing pipe (1) through elasticity, one side of the spring clamp (8) is provided with the screw hole, the spring clamp (8) is in threaded connection with a second bolt (15) through the screw hole, the end part of a screw rod of the second bolt (15) can be matched with the vacuumizing pipe (1), the upper part of the support (4), the arc direction of the arc-shaped groove (16) is downward, a third foaming latex pad (17) is connected to the arc-shaped groove (16), and the third foaming latex pad (17) is matched with the bottom of the air chamber cavity (3).
2. The special tool for multipoint vacuum pumping of the oversize transformer in claim 1, wherein: the bottom of the protective shell (5) is connected with a base (6).
3. The special tool for multipoint vacuum pumping of the oversize transformer in claim 1, wherein: the box cover (11) is of a tubular structure with one end sealed, internal threads are formed on the side circumference of the inner wall of the box cover (11), external threads are formed on the outer side of the protective shell (5), and the box cover (11) is connected with the protective shell (5) through threads.
4. The special tool for multipoint vacuum pumping of the oversize transformer in claim 1, wherein: first foaming latex pad (2) is connected to inside one side of protective housing (5), and second foaming latex pad (10) is connected to inside one side of case lid (11), and air chamber cavity (3) can be cliied in cooperation in first foaming latex pad (2) and second foaming latex pad (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010894398.3A CN112201462B (en) | 2020-08-31 | 2020-08-31 | Special tool for multipoint vacuum pumping of super-huge transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010894398.3A CN112201462B (en) | 2020-08-31 | 2020-08-31 | Special tool for multipoint vacuum pumping of super-huge transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112201462A true CN112201462A (en) | 2021-01-08 |
| CN112201462B CN112201462B (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010894398.3A Active CN112201462B (en) | 2020-08-31 | 2020-08-31 | Special tool for multipoint vacuum pumping of super-huge transformer |
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| Country | Link |
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| CN (1) | CN112201462B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06215956A (en) * | 1993-01-18 | 1994-08-05 | Mitsubishi Electric Corp | Oil tank |
| JPH09266117A (en) * | 1996-03-28 | 1997-10-07 | Toshiba Fa Syst Eng Kk | Oil-immersed electric machine and oiling method for oil-immersed electric machine |
| CN2893883Y (en) * | 2006-04-03 | 2007-04-25 | 卧龙电气集团股份有限公司 | Capsule-in-capsule type capsule oil conservator |
| CN201437451U (en) * | 2009-07-06 | 2010-04-14 | 保定变压器配件有限公司 | Horizontal-type vacuum capsule oil-storage tank |
| CN204242752U (en) * | 2014-10-10 | 2015-04-01 | 中国南方电网有限责任公司超高压输电公司 | For the air chamber that converter transformer vacuumizes |
| CN105047377A (en) * | 2015-09-02 | 2015-11-11 | 国网福建省电力有限公司 | Power-transformer overall vacuumizing device |
| CN209045299U (en) * | 2018-11-09 | 2019-06-28 | 抚州市双菱磁性材料有限公司 | A kind of miniature transformer with protection effect |
-
2020
- 2020-08-31 CN CN202010894398.3A patent/CN112201462B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06215956A (en) * | 1993-01-18 | 1994-08-05 | Mitsubishi Electric Corp | Oil tank |
| JPH09266117A (en) * | 1996-03-28 | 1997-10-07 | Toshiba Fa Syst Eng Kk | Oil-immersed electric machine and oiling method for oil-immersed electric machine |
| CN2893883Y (en) * | 2006-04-03 | 2007-04-25 | 卧龙电气集团股份有限公司 | Capsule-in-capsule type capsule oil conservator |
| CN201437451U (en) * | 2009-07-06 | 2010-04-14 | 保定变压器配件有限公司 | Horizontal-type vacuum capsule oil-storage tank |
| CN204242752U (en) * | 2014-10-10 | 2015-04-01 | 中国南方电网有限责任公司超高压输电公司 | For the air chamber that converter transformer vacuumizes |
| CN105047377A (en) * | 2015-09-02 | 2015-11-11 | 国网福建省电力有限公司 | Power-transformer overall vacuumizing device |
| CN209045299U (en) * | 2018-11-09 | 2019-06-28 | 抚州市双菱磁性材料有限公司 | A kind of miniature transformer with protection effect |
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| Publication number | Publication date |
|---|---|
| CN112201462B (en) | 2022-03-18 |
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