CN214705691U

CN214705691U - Low-noise dry-type transformer structure

Info

Publication number: CN214705691U
Application number: CN202120456645.1U
Authority: CN
Inventors: 黄宁宇; 张太平
Original assignee: Shanghai Youbian Power Technology Co ltd
Current assignee: Shanghai Youbian Power Technology Co ltd
Priority date: 2021-03-03
Filing date: 2021-03-03
Publication date: 2021-11-12
Anticipated expiration: 2031-03-03

Abstract

The utility model discloses a dry-type transformer structure of low noise, it relates to transformer technical field. The iron core is sleeved with a low-voltage coil, a glass fiber supporting plate is installed between the low-voltage coil and the iron core, a high-voltage coil is sleeved on the outer side of the low-voltage coil, a composite insulating cylinder is placed between the high-voltage coil and the low-voltage coil, the lower ends of the high-voltage coil, the composite insulating cylinder and the low-voltage coil are supported and fixed on a lower clamping piece through a lower pressing block, the lower pressing block is installed on a base, the upper ends of the high-voltage coil, the composite insulating cylinder and the low-voltage coil are in compression joint on an upper clamping piece through an upper pressing block, the upper pressing block is fixedly connected with the upper clamping piece through a pressing nail, and the upper clamping piece and the lower clamping piece are connected into a whole through a pulling plate. The utility model discloses effectively reduce the no-load noise and the load noise of transformer, noise abatement pollutes, and easily preparation, with low costs, has better economic benefits, and application prospect is wide.

Description

Low-noise dry-type transformer structure

Technical Field

The utility model relates to a transformer technical field, concretely relates to dry-type transformer structure of low noise.

Background

The dry-type transformer has good fireproof and explosion-proof performance, and is widely applied to districts, high-rise buildings, markets, airports and other places. The dry-type transformer is generally used for a power distribution network terminal, provides required electric energy for users, goes deep into a load center, and is concerned about noise pollution along with the continuous development of technology and the improvement of living standard of people, so that the requirements of a power grid company on product performance and reliability are improved, and the requirements on transformer operation noise control are higher and higher. At present, the transformer noise is examined mainly by the no-load operation noise index in the industry, the no-load noise is mainly generated by an iron core, the condition is suitable for small-capacity distribution transformation, when the transformer capacity reaches a certain degree, the load noise cannot be ignored due to the large load current of the transformer, even exceeds the no-load noise to become main noise pollution, the load is low-frequency noise, the propagation distance and the seepage force of the transformer far exceed the influence of the no-load noise, and serious noise pollution is generated around the transformer.

In order to solve the above problems, it is particularly necessary to design a new type of low noise dry-type transformer structure.

Disclosure of Invention

The utility model aims at providing a dry-type transformer structure of low noise, simple structure, reasonable in design, mechanical stability is good, can effective noise reduction, noise abatement pollutes, easily preparation, with low costs, and the practicality is strong, easily uses widely.

In order to achieve the above purpose, the present invention is realized by the following technical solution: the utility model provides a dry-type transformer structure of low noise, includes iron core, high-voltage coil, compound insulating cylinder, low-voltage coil, fine fagging of glass, arm-tie, briquetting, base down, goes up the briquetting, lower folder, goes up folder and pressure nail down, has cup jointed low-voltage coil on the iron core, installs fine fagging of glass between low-voltage coil and the iron core, and low-voltage coil outside cover is equipped with high-voltage coil, has placed compound insulating cylinder between high-voltage coil and the low-voltage coil, high-voltage coil, compound insulating cylinder, low-voltage coil's lower extreme support through briquetting down and fix under on folder, lower briquetting is installed on the base, high-voltage coil, compound insulating cylinder, low-voltage coil's upper end through last briquetting crimping on last folder, go up the briquetting through pressing nail and last folder fixed connection, last folder and lower folder between be connected as a whole through the arm-tie embedding.

Preferably, a piece of polyester film with the thickness of 1.1mm is laid between the upper clamping piece, the lower clamping piece, the pulling plate and the iron core.

Preferably, the composite insulating cylinder is placed between the high-voltage coil and the low-voltage coil in the center; the composite insulating cylinder is formed by rolling a 1.1mm composite film.

Preferably, the glass fiber supporting plates are provided with a plurality of glass fiber supporting plates, the glass fiber supporting plates are formed by molding short glass fibers, the heads of the glass fiber supporting plates are wedge-shaped, two sides of one surface of each glass fiber supporting plate are chamfers, the chamfers face the low-voltage coil to be placed, and the glass fiber supporting plates are placed between the low-voltage coil and the iron core, and two ends of each side of each glass fiber supporting plate are close to the air channel rod.

Preferably, the upper pressing block and the lower pressing block are both made of unsaturated polyester glass fiber reinforced molding compound.

Preferably, the iron core adopts a multi-stage fully-inclined seam three-phase three-column silicon steel sheet structure, the section of a core column is in an oblong shape, and the core column and the lower iron yoke are coated with polyurethane paint and fixed by a binding band.

Preferably, the high-voltage coil is of a four-section long round structure, and is formed by winding a copper wire and a glass fiber mesh fabric, then pouring epoxy resin in a special pouring mold under a vacuum condition, and heating and curing; the low-voltage coil is of a long round structure formed by winding a copper foil and a presoaked DMD film, and an air channel rod is arranged in the low-voltage coil.

The utility model has the advantages that: the device effectively reduces the loss of the iron core and the exciting current, reduces the no-load noise and the load noise of the transformer, reduces noise pollution, is easy to manufacture, has low cost, has better economic benefit and has wide application prospect.

Drawings

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments;

fig. 1 is a schematic structural view of the present invention;

fig. 2 is an installation schematic diagram of the iron core and the coil of the present invention.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.

Referring to fig. 1-2, the following technical solutions are adopted in the present embodiment: a low-noise dry-type transformer structure comprises an iron core 1, a high-voltage coil 2, a composite insulating cylinder 3, a low-voltage coil 4, a glass fiber supporting plate 5, a pulling plate 6, a lower pressing block 7, a base 8, an upper pressing block 9, a lower clamping piece 10, an upper clamping piece 11 and a pressing nail 12, wherein the iron core 1 is sleeved with the low-voltage coil 4, the glass fiber supporting plate 5 is installed between the low-voltage coil 4 and the iron core 1, the high-voltage coil 2 is sleeved outside the low-voltage coil 4, the composite insulating cylinder 3 is placed between the high-voltage coil 2 and the low-voltage coil 4, the lower ends of the high-voltage coil 2, the composite insulating cylinder 3 and the low-voltage coil 4 are supported and fixed on the lower clamping piece 10 through the lower pressing block 7, the lower pressing block 7 is installed on the base 8, the upper ends of the high-voltage coil 2, the composite insulating cylinder 3 and the low-voltage coil 4 are pressed and connected on the upper clamping piece 11 through the upper pressing block 9, the upper pressing nail 12 is fixedly connected with the upper clamping piece 11, the upper clamping piece 11 and the lower clamping piece 10 are connected into a whole through the pulling plate 6 in an embedded mode.

Notably, the composite insulating cylinder 3 is placed centrally between the high voltage coil 2 and the low voltage coil 4; the composite insulating cylinder 3 is formed by rolling a 1.1mm composite film.

It should be noted that the glass fiber supporting plate 5 is provided with a plurality of glass fiber supporting plates 5, the glass fiber supporting plate 5 is formed by molding short glass fibers, the head part of the glass fiber supporting plate is wedge-shaped, two side parts of one side of the glass fiber supporting plate are chamfered, the chamfered side faces the low-voltage coil 4, and the glass fiber supporting plate 5 is arranged between the low-voltage coil 4 and the iron core 1, and two side ends of each side of the glass fiber supporting plate are close to the air passage rod.

In addition, the pulling plate 6, the lower clamping piece 10, the base 8 and the upper clamping piece 11 are all made of steel plates, the upper pressing block 9 and the lower pressing block 7 are both made of unsaturated polyester glass fiber reinforced molding plastics, and the pressing nail 12 is a high-strength bolt.

The iron core 1 of the embodiment adopts a multi-stage fully-inclined joint three-phase three-column silicon steel sheet structure by silicon steel sheets, the cross section of a core column is in an oblong shape, the core column and a lower yoke are coated with polyurethane paint and are fixed by a binding band, the upper yoke and the lower yoke are bent by steel plates to be made into clamping pieces to be clamped and fixed, an upper clamping piece 11 and a lower clamping piece 10 are connected into a whole to be fastened and limited by a pull plate 6 embedded into the clamping pieces, and meanwhile, a polyester film with the thickness of 1.1mm is laid between the upper clamping piece 11, the lower clamping piece 10 and the pull plate 6 and the iron core 1 for insulation. The high-voltage coil 2 adopts a four-section long round structure, is formed by winding a copper wire and glass fiber mesh cloth, then performing epoxy resin casting under a vacuum condition through a special casting mold, and performing heating curing according to a special epoxy resin temperature curing curve; the low-voltage coil 4 is a long round structure with an air channel rod inside, and is formed by rolling copper foil or aluminum foil, a pre-soaked DMD film and the air channel rod through special equipment, keeping constant pressure through a special pressing tool and heating and curing at 110 +/-5 ℃. The high-voltage coil 2 is sleeved outside the low-voltage coil 4, the low-voltage coil 4 is sleeved on the iron core 1, 1-2 glass fiber supporting plates 5 are propped into the space between the long shafts on two sides of the low-voltage coil 4 and the main stage of the iron core column along the axial direction of the coil, the glass fiber supporting plates 5 are tightly attached to air passage strips at corresponding positions of the low-voltage coil 4, a certain interference magnitude is guaranteed when the glass fiber supporting plates are propped, the high-voltage coil 2 and the low-voltage coil 4 are connected and firmly pressed with the upper clamping piece 11 and the lower clamping piece 10 through the upper pressing block 9 and the lower pressing block 7 respectively, and the pressing force and the tightness of the upper pressing block 9 and the coil 4 are adjusted through the fastening pressing nail 12.

The technical advantages of this embodiment are: (1) the iron core adopts a multi-stage fully-inclined seam structure, so that seam magnetic leakage can be reduced, and the loss and noise of the iron core are reduced;

(2) the high-voltage coil can reduce the local discharge amount by sectional vacuum pouring, and the coil has higher mechanical stability;

(3) the low-voltage coil is presoaked with DMD and is heated and cured at constant pressure, so that the coil can be fully fused and bonded into a whole after being heated at high temperature, the rigidity of the coil is increased, and the noise caused by vibration and collision among layers is reduced;

(4) the coil and the iron core are both in long circular structures, compared with the traditional circular structure, the center distance of the iron core is shortened, the magnetic path distance is shortened, the iron core loss and the exciting current can be effectively reduced, the no-load noise is reduced, the iron core consumption is reduced, and the economic benefit is better;

(5) the transformer load noise is mainly generated by radial vibration of the low-voltage coil under the action of large-current electrodynamic force, and the glass fiber supporting plates are arranged between the long axes on the two sides of the low-voltage coil and the main stage of the iron core column, so that the radial vibration of the low-voltage coil can be effectively reduced, the load noise of the transformer is further reduced, and hysteresis loss and noise rise caused by extrusion and distortion of the iron core sheet due to the fact that the supporting plates are supported in the short axis direction are avoided;

the structure has excellent mechanical stability, can fully offset the noise generated by vibration of the coil and the structural member caused by load current, can reduce the load noise by 5-7dB, is suitable for dry-type transformers with the voltage level of 35kV or below, has high reliability and has wide market application prospect.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A low-noise dry-type transformer structure is characterized by comprising an iron core (1), a high-voltage coil (2), a composite insulating cylinder (3), a low-voltage coil (4), a glass fiber supporting plate (5), a pulling plate (6), a lower pressing block (7), a base (8), an upper pressing block (9), a lower clamping piece (10), an upper clamping piece (11) and pressing nails (12), wherein the iron core (1) is sleeved with the low-voltage coil (4), the glass fiber supporting plate (5) is installed between the low-voltage coil (4) and the iron core (1), the high-voltage coil (2) is sleeved outside the low-voltage coil (4), the composite insulating cylinder (3) is placed between the high-voltage coil (2) and the low-voltage coil (4), the lower ends of the high-voltage coil (2), the composite insulating cylinder (3) and the low-voltage coil (4) are supported and fixed on the lower clamping piece (10) through the lower pressing block (7), the lower pressing block (7) is installed on the base (8), the upper ends of the high-voltage coil (2), the composite insulating cylinder (3) and the low-voltage coil (4) are in compression joint with an upper clamping piece (11) through an upper pressing block (9), the upper pressing block (9) is fixedly connected with the upper clamping piece (11) through a pressing nail (12), and the upper clamping piece (11) and a lower clamping piece (10) are connected into a whole through a pulling plate (6) in an embedded mode.

2. A low noise dry transformer structure as claimed in claim 1, wherein a mylar is laid between said upper clamp (11), said lower clamp (10) and said pulling plate (6) and said iron core (1), said mylar having a thickness of 1.1 mm.

3. A low noise dry transformer structure as claimed in claim 1, characterized in that said composite insulating cylinder (3) is placed centrally between the high voltage coil (2) and the low voltage coil (4).

4. A low noise dry transformer structure as claimed in claim 1, wherein said composite insulating cylinder (3) is made by winding 1.1mm composite film.

5. A low noise dry transformer structure as claimed in claim 1, wherein said glass fiber support plates (5) are provided in a plurality, and the glass fiber support plates (5) are placed between the low voltage coil (4) and the core (1) at positions close to the air passage bars at both ends of each side of the side axis.

6. A low noise dry transformer structure as claimed in claim 1, wherein the glass fiber support plate (5) is a glass fiber molded support plate, the head is wedge-shaped, and two edges of one surface of the glass fiber support plate (5) are chamfered, and the chamfered surface is disposed toward the low voltage coil (4).

7. A low noise dry transformer structure as claimed in claim 1, wherein said upper and lower pressing blocks (9, 7) are made of unsaturated polyester glass fiber reinforced molding plastic pressing blocks.

8. A low noise dry transformer structure as claimed in claim 1, wherein said iron core (1) is made of multi-stage full-angle joint three-phase three-column silicon steel sheet structure, the section of the column is oblong, and the column and the lower yoke are coated with polyurethane paint.

9. A low noise dry transformer structure as claimed in claim 1, wherein said low voltage coil (4) is an oblong structure made by winding copper foil and pre-impregnated DMD film.