CN115083744A - Iron core clamping frame for resin insulation dry type transformer - Google Patents
Iron core clamping frame for resin insulation dry type transformer Download PDFInfo
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- CN115083744A CN115083744A CN202210910366.7A CN202210910366A CN115083744A CN 115083744 A CN115083744 A CN 115083744A CN 202210910366 A CN202210910366 A CN 202210910366A CN 115083744 A CN115083744 A CN 115083744A
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- clamping
- clamping plate
- iron core
- outer walls
- type transformer
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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
- H01F27/24—Magnetic cores
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
- H01F27/263—Fastening parts of the core together
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Abstract
The invention discloses an iron core clamping frame for a resin insulation dry-type transformer, which comprises first clamping plates, wherein first screw rods are arranged on the inner walls of four first screw holes in an inserted mode, fixing rings are sleeved on the outer walls of one ends of the four first screw rods, the inner walls of the four fixing rings are respectively in threaded connection with the outer walls of the four first screw rods, supporting rods are arranged at four corners of one side of each first clamping plate in an inserted mode, fixing pieces are sleeved at the middle positions of the outer walls of the four supporting rods, and first springs are sleeved on the outer walls of one ends of the four supporting rods. According to the invention, after the magnetic flux iron core is clamped by the clamping ring and the first bolt, the fixing rings at the upper ends of the four first screws are screwed to shorten the distance between the first clamping plate and the second clamping plate, the first clamping plate slides on the supporting rod to press the first spring to deform so as to shorten the distance, so that the magnetic flux iron core is clamped, and the fixing rings are loosened at the later stage to loosen the clamping structure to maintain the magnetic flux iron core, so that the use convenience of the device is improved.
Description
Technical Field
The invention relates to the technical field of iron core clamping frames, in particular to an iron core clamping frame for a resin insulation dry type transformer.
Background
A conventional transformer is a device for changing an alternating voltage using the principle of electromagnetic induction, and main components are a primary coil, a secondary coil, and an iron core (magnetic core). The main functions are as follows: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer) and the like, wherein the transformer is basic equipment for power transmission and distribution and is widely applied to the fields of industry, agriculture, traffic, urban communities and the like. About 1700 thousands of transformers run in the network in China, and the total capacity is about 110 hundred million kilovolt-ampere. The transformer loss accounts for about 40% of the power loss of power transmission and distribution, and has a large energy-saving potential. In order to accelerate the popularization and application of the high-efficiency energy-saving transformer and improve the utilization efficiency of energy resources, when the transformer is used, the clamping frame at the upper end of the transformer mainly plays a role in clamping and fixing the iron core with the coil, so that the transformer can be more stable in working;
in view of the above, chinese patent No. CN102360774A provides an iron core clamping frame for a resin-insulated dry-type transformer, the iron core clamping frame has a simple structure, is convenient to use, has a good clamping effect, and avoids the loosening of an iron core, and meanwhile, a rubber insulating sleeve and an insulating sleeve are adopted, so that not only can noise be reduced in the subsequent use process, but also the surface of a product is not easily damaged, the stability and safety performance of the product are enhanced, the operation of the processing process is simple, the processing time is shortened, and the production efficiency and safety performance are improved.
Disclosure of Invention
The present invention is directed to a core clamping frame for a resin-insulated dry-type transformer, which solves the above-mentioned problems of the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: an iron core clamping frame for a resin insulation dry-type transformer comprises a first clamping plate, wherein two first screw holes are respectively formed in the edges of two ends of one side of the first clamping plate, first screw rods are respectively arranged on the inner walls of the four first screw holes in an inserting manner, fixing rings are respectively sleeved on the outer walls of one ends of the four first screw rods, the inner walls of the four fixing rings are respectively in threaded connection with the outer walls of the four first screw rods, supporting rods are respectively arranged at four corners of one side of the first clamping plate in an inserting manner, limiting pieces are respectively fixedly arranged at the top ends of the four supporting rods, fixing pieces are respectively sleeved at the middle positions of the outer walls of the four supporting rods, first springs are respectively sleeved on the outer walls of one ends of the four supporting rods, one ends of the first springs are respectively fixedly connected with one sides of the four fixing pieces, and the other ends of the four first springs are respectively in contact with four corners of one side of the first clamping plate, four the bottom of first screw rod all is fixed and is equipped with the second clamp plate, and the top of second clamp plate respectively with the bottom fixed connection of four first screw rods, the card hole has all been seted up at the both ends of first clamp plate one side and the both ends of second clamp plate one side.
Preferably, the connecting holes are formed in four corners of the top end of the first clamping plate and four corners of the top end of the second clamping plate, the outer walls of one ends of the four supporting rods are respectively and alternately connected with the inner walls of the four connecting holes, and the outer walls of the other ends of the four supporting rods are respectively and fixedly connected with the inner walls of the other four connecting holes.
Preferably, the inner wall of the first clamping plate and the inner wall of the second clamping plate are both provided with buffer grooves, and a plurality of clamping rings are fixedly arranged at the top end of the second clamping plate at equal intervals.
Preferably, every the both sides of snap ring inner wall all are fixed and are equipped with insulating pad, every the both ends of snap ring one side all alternate and are equipped with first bolt, and every first bolt respectively with the inner wall threaded connection of every snap ring one side.
Preferably, the two sides of the first clamping plate and the two sides of the second clamping plate are clamped with connecting strips, four connecting strips are fixedly arranged on one side of each connecting strip, and the outer wall of each clamping strip is clamped with the inner wall of each clamping hole.
Preferably, wherein two the both sides of connecting strip bottom all are fixed and are equipped with the connecting axle, and the outer wall of four connecting axles alternates with the inner wall of two other connecting strips respectively and be connected, four the edge of connecting strip one side all is fixed and is equipped with the stopper.
Preferably, one side of each limiting block is provided with a second bolt in a penetrating manner, and the outer walls of the two second bolts penetrate through the inner walls of the two limiting blocks and are in threaded connection with the inner walls of the other two limiting blocks.
Preferably, the both sides at second pinch plate bottom both ends are all fixed to be equipped with the fixed axle, wherein two one side of fixed axle is all fixed to be equipped with and to connect the axle, and two outer walls that connect axle one end alternate with the inner wall of two other fixed axles respectively and be connected, two the outer wall that connects the axle all overlaps and is equipped with the second spring, and the both ends of two second springs respectively with one side fixed connection of four fixed axles.
Preferably, the inner wall of snap ring all blocks and is equipped with the magnetic flow iron core, and the outer wall of every first bolt alternates with the inner wall of every magnetic flow iron core respectively and is connected, and the both sides of second clamp plate are all fixed and are equipped with the spacer, two a plurality of second screws have been seted up to one side impartial distance of spacer.
Preferably, the both sides on first clamp plate top are all fixed and are equipped with the second screw rod, two the bottom of second screw rod outer wall all is equipped with the rubber pad, two the upper end of second screw rod outer wall all is equipped with the connection cap, and two inner walls of connecting the cap respectively with the outer wall threaded connection of two second screw rods, two the third screw has all been seted up to one side of connecting the cap.
The invention has the technical effects and advantages that:
(1) according to the invention, the clamping frame structure convenient for adjusting the tightness is arranged on the device, and the structure mainly comprises the first clamping plate, the first screw hole, the first screw rod, the fixing ring, the supporting rod, the limiting piece, the fixing piece, the first spring, the second clamping plate, the clamping ring, the first bolt and the like, after the magnetic flux iron core is clamped through the clamping ring and the first bolt, the fixing ring at the upper ends of the four first screw rods is screwed to shorten the distance between the first clamping plate and the second clamping plate, the first clamping plate slides on the supporting rod to press the first spring to deform to shorten the distance, so that the magnetic flux iron core is clamped, and the clamping structure can be loosened to maintain the magnetic flux iron core after the fixing ring is loosened in the later stage, so that the convenience in use of the device is improved;
(2) according to the invention, the auxiliary reinforcing connecting structure is arranged on the device, and mainly comprises the clamping holes, the buckles, the connecting strips, the connecting shaft, the limiting blocks, the second bolt and the like, when the device is used, the buckles at the upper ends of the connecting strips are clamped in the clamping holes at the upper ends of the first clamping plate and the second clamping plate, so that the positioning and the fixing can be realized, the second bolt is screwed to contract the distance between the connecting strips at two ends, the connecting shaft is made to stretch out and draw back in the connecting strips, the clamping property of the clamping frame can be improved, the clamping frame can be more stable and is not easy to loosen, and the use stability of the device is improved;
(3) the buffer fixing structure is arranged on the device and mainly comprises the positioning piece, the second screw hole, the fixing shaft, the butt joint shaft, the second spring and the like, when the buffer fixing structure is used, the device is fixed through the positioning piece and the second screw hole at the upper end of the positioning piece and is required to face the impact of wind power when being installed at high altitude, and when the buffer fixing structure is impacted, the butt joint shaft at the upper end of the fixing shaft stretches on the inner wall of the butt joint shaft, extrudes the second spring to generate deformation, further generates buffer force, reduces the damage of airflow impact to the device, and accordingly improves the protection performance of the device in use.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a schematic structural view of the support rod and the first screw rod of the present invention with adjustable positions.
FIG. 3 is a schematic view of a positioning structure of the snap ring of the present invention.
Fig. 4 is a schematic structural view of auxiliary reinforcement of the connecting strip of the present invention.
FIG. 5 is a schematic view of the structure of the fixing shaft and the buffering shield of the docking shaft according to the present invention.
In the figure: 1. a first clamping plate; 2. a first screw hole; 3. a first screw; 4. a fixing ring; 5. a support bar; 6. a limiting sheet; 7. a fixing sheet; 8. a first spring; 9. clamping holes; 10. a second clamping plate; 11. connecting holes; 12. a buffer tank; 13. a snap ring; 14. an insulating pad; 15. a first bolt; 16. a connecting strip; 17. buckling; 18. a connecting shaft; 19. a limiting block; 20. a second bolt; 21. a fixed shaft; 22. a butt joint shaft; 23. a second spring; 24. a magnetic flux core; 25. positioning a sheet; 26. a second screw hole; 27. a rubber pad; 28. a second screw; 29. a connecting cap; 30. and a third screw hole.
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.
The invention provides an iron core clamping frame for a resin insulation dry-type transformer as shown in figures 1-5, which comprises a first clamping plate 1, wherein magnetic flux iron cores 24 are clamped on the inner walls of clamping rings 13, the outer wall of each first bolt 15 is respectively connected with the inner wall of each magnetic flux iron core 24 in an inserting manner, positioning plates 25 are fixedly arranged on two sides of a second clamping plate 10, a plurality of second screw holes 26 are arranged on one sides of the two positioning plates 25 at equal distances, second screw rods 28 are fixedly arranged on two sides of the top end of the first clamping plate 1, rubber pads 27 are sleeved on the bottoms of the outer walls of the two second screw rods 28, connecting caps 29 are sleeved on the upper ends of the outer walls of the two second screw rods 28, the inner walls of the two connecting caps 29 are respectively connected with the outer walls of the two second screw rods 28 in a threaded manner, and third screw holes 30 are arranged on one sides of the two connecting caps 29;
as shown in FIG. 2, two first screw holes 2 are respectively formed at the edges of two ends of one side of a first clamping plate 1, first screws 3 are respectively inserted into the inner walls of four first screw holes 2, fixing rings 4 are respectively sleeved on the outer walls of one ends of four first screws 3, the inner walls of four fixing rings 4 are respectively in threaded connection with the outer walls of four first screws 3, supporting rods 5 are respectively inserted into four corners of one side of the first clamping plate 1, limiting pieces 6 are respectively fixed at the top ends of the four supporting rods 5, fixing pieces 7 are respectively sleeved at the middle positions of the outer walls of the four supporting rods 5, first springs 8 are respectively sleeved on the outer walls of one ends of the four supporting rods 5, one ends of the first springs 8 are respectively fixedly connected with one sides of the four fixing pieces 7, the other ends of the four first springs 8 are respectively in contact with four corners of one side of the first clamping plate 1, second clamping plates 10 are respectively fixed at the bottoms of the four first screws 3, the top ends of the second clamping plates 10 are fixedly connected with the bottoms of the four first screws 3 respectively, and clamping holes 9 are formed in the two ends of one side of each first clamping plate 1 and the two ends of one side of each second clamping plate 10;
as shown in fig. 3, four corners of the top end of the first clamping plate 1 and four corners of the top end of the second clamping plate 10 are all provided with connecting holes 11, outer walls of one ends of four supporting rods 5 are respectively inserted into and connected with inner walls of four of the connecting holes 11, outer walls of the other ends of the four supporting rods 5 are respectively fixedly connected with inner walls of the other four connecting holes 11, inner walls of the first clamping plate 1 and inner walls of the second clamping plate 10 are both provided with buffer grooves 12, the top end of the second clamping plate 10 is fixedly provided with a plurality of clamping rings 13 at equal intervals, two sides of the inner wall of each clamping ring 13 are both fixedly provided with insulating pads 14, two ends of one side of each clamping ring 13 are both inserted with first bolts 15, and each first bolt 15 is respectively in threaded connection with the inner wall of one side of each clamping ring 13;
as shown in fig. 4, connecting strips 16 are respectively clamped on both sides of the first clamping plate 1 and both sides of the second clamping plate 10, a buckle 17 is fixedly arranged on one side of each of the four connecting strips 16, and the outer wall of each buckle 17 is respectively clamped and connected with the inner wall of each clamping hole 9, wherein connecting shafts 18 are fixedly arranged on both sides of the bottom of each of the two connecting strips 16, the outer walls of the four connecting shafts 18 are respectively inserted and connected with the inner walls of the other two connecting strips 16, limit blocks 19 are respectively fixedly arranged on the edges of one sides of the four connecting strips 16, second bolts 20 are respectively inserted and arranged on one sides of the two limit blocks 19, and the outer walls of the two second bolts 20 respectively penetrate through the inner walls of the two limit blocks 19 and are in threaded connection with the inner walls of the other two limit blocks 19;
as shown in fig. 5, the two sides of the two ends of the bottom of the second clamping plate 10 are both fixedly provided with fixing shafts 21, one side of each of the two fixing shafts 21 is fixedly provided with a butt joint shaft 22, the outer walls of one ends of the two butt joint shafts 22 are respectively inserted into the inner walls of the other two fixing shafts 21, the outer walls of the two butt joint shafts 22 are respectively sleeved with second springs 23, and the two ends of the two second springs 23 are respectively fixedly connected with one sides of the four fixing shafts 21.
The working principle of the invention is as follows: when the iron core clamping frame for the resin insulation dry type transformer in the design scheme is used, firstly, a first clamping plate 1 and a second clamping plate 10 at the upper end of the device are connected through a support rod 5 and a first screw rod 3, so that a magnetic flux iron core 24 with a coil is clamped and clamped between the two clamping plates, the normal use of the transformer is facilitated, in addition, the clamping frame structure which is composed of the first clamping plate 1, a first screw hole 2, the first screw rod 3, a fixing ring 4, the support rod 5, a limiting sheet 6, a fixing sheet 7, a first spring 8, the second clamping plate 10, a clamping ring 13, a first bolt 15 and the like and is convenient for adjusting the tightness is arranged in the design scheme, when in use, after the magnetic flux iron core 24 is clamped through the clamping ring 13 and the first bolt 15, the fixing rings 4 at the upper ends of the four first screw rods 3 are screwed, so that the distance between the first clamping plate 1 and the second clamping plate 10 is shortened, the first clamping plate 1 slides on the supporting rod 5 to press the first spring 8 to deform to shorten the distance, so that the magnetic flux iron core 24 is clamped, the clamping structure can be loosened to maintain the magnetic flux iron core after the fixing ring 4 is loosened, and the device is provided with an auxiliary reinforcing connecting structure consisting of a clamping hole 9, a buckle 17, a connecting strip 16, a connecting shaft 18, a limiting block 19, a second bolt 20 and the like When the buffering fixing structure is used, the device is fixed through the positioning piece 25 and the second screw hole 26 at the upper end of the buffering fixing structure, the buffering fixing structure is required to face the impact of wind power when the buffering fixing structure is installed at a high altitude, the butting shaft 22 at the upper end of the fixing shaft 21 stretches on the inner wall of the butting shaft to extrude the second spring 23 to deform, so that buffering force is generated, the damage of airflow impact to the device is reduced, and the using protection performance of the device is improved.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "mounted," "connected," and "secured" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integral to; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The standard parts used by the invention can be purchased from the market, and the special-shaped parts can be customized according to the description and the description of the attached drawings.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An iron core clamping frame for a resin insulation dry-type transformer comprises a first clamping plate (1), wherein two first screw holes (2) are formed in the edges of two ends of one side of the first clamping plate (1), first screw rods (3) are inserted into the inner walls of the four first screw holes (2), and fixing rings (4) are sleeved on the outer walls of one ends of the four first screw rods (3); the clamping device is characterized in that the inner walls of four fixing rings (4) are respectively in threaded connection with the outer walls of four first screw rods (3), supporting rods (5) are arranged at four corners of one side of a first clamping plate (1) in an alternating mode, limiting pieces (6) are fixedly arranged at the top ends of the four supporting rods (5), fixing pieces (7) are sleeved at the middle positions of the outer walls of the four supporting rods (5), first springs (8) are sleeved on the outer walls of one ends of the four supporting rods (5), one ends of the first springs (8) are respectively and fixedly connected with one sides of the four fixing pieces (7), the other ends of the four first springs (8) are respectively in contact with the four corners of one side of the first clamping plate (1), second clamping plates (10) are fixedly arranged at the bottoms of the four first screw rods (3), and the tops of the second clamping plates (10) are respectively and fixedly connected with the bottoms of the four first screw rods (3), the clamping holes (9) are formed in the two ends of one side of the first clamping plate (1) and the two ends of one side of the second clamping plate (10).
2. The iron core clamping frame for the resin insulation dry type transformer according to claim 1, wherein the four corners of the top end of the first clamping plate (1) and the four corners of the top end of the second clamping plate (10) are respectively provided with a connecting hole (11), the outer walls of one end of the four supporting rods (5) are respectively inserted and connected with the inner walls of four connecting holes (11), and the outer walls of the other end of the four supporting rods (5) are respectively fixedly connected with the inner walls of the other four connecting holes (11).
3. The iron core clamping frame for the resin insulation dry type transformer according to claim 1, wherein the inner wall of the first clamping plate (1) and the inner wall of the second clamping plate (10) are both provided with buffer grooves (12), and a plurality of clamping rings (13) are fixedly arranged at the top end of the second clamping plate (10) at equal intervals.
4. The iron core clamping frame for the resin-insulated dry-type transformer according to claim 3, wherein an insulating pad (14) is fixedly arranged on both sides of the inner wall of each snap ring (13), a first bolt (15) is inserted into both ends of one side of each snap ring (13), and each first bolt (15) is respectively in threaded connection with the inner wall of one side of each snap ring (13).
5. The iron core clamping frame for the resin-insulated dry-type transformer according to claim 1, wherein two sides of the first clamping plate (1) and two sides of the second clamping plate (10) are provided with connecting strips (16) in a clamping manner, one side of each of the four connecting strips (16) is fixedly provided with a snap-in buckle (17), and the outer wall of each snap-in buckle (17) is respectively connected with the inner wall of each snap-in hole (9) in a clamping manner.
6. The iron core clamping frame for the resin insulation dry type transformer according to claim 5, wherein the connecting shafts (18) are fixedly arranged on both sides of the bottom of two of the connecting strips (16), the outer walls of four connecting shafts (18) are respectively and alternately connected with the inner walls of the other two connecting strips (16), and the edges of one side of the four connecting strips (16) are respectively and fixedly provided with a limiting block (19).
7. The iron core clamping frame for the resin insulation dry type transformer according to claim 6, wherein one side of each of the two limiting blocks (19) is inserted with a second bolt (20), and the outer walls of the two second bolts (20) respectively penetrate through the inner walls of the two limiting blocks (19) to be in threaded connection with the inner walls of the other two limiting blocks (19).
8. The iron core clamping frame for the resin insulation dry type transformer according to claim 1, wherein the second clamping plate (10) is fixedly provided with a fixed shaft (21) at both sides of the bottom end, wherein one side of two fixed shafts (21) is fixedly provided with a butt joint shaft (22), the outer walls of one ends of the two butt joint shafts (22) are respectively and alternately connected with the inner walls of the other two fixed shafts (21), the outer walls of the two butt joint shafts (22) are respectively sleeved with a second spring (23), and both ends of the two second springs (23) are respectively and fixedly connected with one side of the four fixed shafts (21).
9. The iron core clamping frame for the resin insulation dry type transformer according to claim 3, wherein the magnetic flux iron core (24) is clamped on the inner wall of the clamping ring (13), the outer wall of each first bolt (15) is respectively inserted into and connected with the inner wall of each magnetic flux iron core (24), positioning pieces (25) are fixedly arranged on both sides of the second clamping plate (10), and a plurality of second screw holes (26) are formed in one side of each positioning piece (25) at equal distances.
10. The iron core clamping frame for the resin insulation dry type transformer according to claim 1, wherein the two sides of the top end of the first clamping plate (1) are respectively fixedly provided with a second screw (28), the bottoms of the outer walls of the two second screws (28) are respectively sleeved with a rubber pad (27), the upper ends of the outer walls of the two second screws (28) are respectively sleeved with a connecting cap (29), the inner walls of the two connecting caps (29) are respectively in threaded connection with the outer walls of the two second screws (28), and one side of each of the two connecting caps (29) is provided with a third screw hole (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210910366.7A CN115083744A (en) | 2022-07-29 | 2022-07-29 | Iron core clamping frame for resin insulation dry type transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210910366.7A CN115083744A (en) | 2022-07-29 | 2022-07-29 | Iron core clamping frame for resin insulation dry type transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115083744A true CN115083744A (en) | 2022-09-20 |
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ID=83242980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210910366.7A Pending CN115083744A (en) | 2022-07-29 | 2022-07-29 | Iron core clamping frame for resin insulation dry type transformer |
Country Status (1)
| Country | Link |
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| CN (1) | CN115083744A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115424820A (en) * | 2022-09-26 | 2022-12-02 | 江西亚珀电气有限公司 | Split type resin insulation dry-type transformer |
| CN115424820B (en) * | 2022-09-26 | 2024-05-31 | 江西亚珀电气有限公司 | Split type resin insulation dry-type transformer |
-
2022
- 2022-07-29 CN CN202210910366.7A patent/CN115083744A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115424820A (en) * | 2022-09-26 | 2022-12-02 | 江西亚珀电气有限公司 | Split type resin insulation dry-type transformer |
| CN115424820B (en) * | 2022-09-26 | 2024-05-31 | 江西亚珀电气有限公司 | Split type resin insulation dry-type transformer |
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