CN102494135A - Cork and rubber mixed sealing ring for oil-immersed power transformer - Google Patents
Cork and rubber mixed sealing ring for oil-immersed power transformer Download PDFInfo
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- CN102494135A CN102494135A CN2011104221527A CN201110422152A CN102494135A CN 102494135 A CN102494135 A CN 102494135A CN 2011104221527 A CN2011104221527 A CN 2011104221527A CN 201110422152 A CN201110422152 A CN 201110422152A CN 102494135 A CN102494135 A CN 102494135A
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- rubber
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Abstract
Disclosed is a cork and rubber mixed sealing ring for an oil-immersed power transformer. Granulated cork is mixed in acrylonitrile-butadiene rubber forming a ring body of the sealing ring, the number of meshes of the granulated cork ranges from 20 to 40, the grain size of the granulated cork ranges from 0.5mm to 1.5mm, the outer diameter of the ring body of the sealing ring ranges from 34mm to 85mm, the inner diameter of the ring body of the sealing ring ranges from 19mm to 58mm, and the thickness of the ring body of the sealing ring ranges from 6mm to 15mm. The cork and rubber mixed sealing ring for the oil-immersed power transformer is high in compressibility, good in compression recovery performance, high in hardness and tensile strength and large in deformation adaptability and hardness adjustment range, and can be used for a long time while performances of the cork and rubber mixed sealing ring are not changed, and ageing resistance and an insulating property are good.
Description
Technical field
The present invention relates to a kind of general component of transformer; Relating in particular to a kind of expansion chamber, oil conservator, air chamber, iron core group and high low pressure sleeve pipe etc. that are applied to oil-immersed power transformer locates; Be used for sealing or be filled in this place, in order to keep clean, the special sealing ring of drying.
Background technique
At present; Along with since country greatly develops infrastructure construction, wherein, be in important status to one of Infrastructure-urban and rural power grids construction and improvement project always; And in power grid construction and transformation process; The use of transformer then occupies indispensable status, and under the existing technology the kind of the transformer that often uses, be divided into two kinds by its type of cooling; Be respectively dry-type transformer and oil immersed transformer, and factors such as power department associativity price ratio are selected oil-immersed power transformer mostly for use.
And at oil-immersed power transformer, so the name meaning can use a kind of transformer oil as filling, cooling medium; It can play effects such as insulation, heat radiation, extinguishing arc, though this transformer oil has no problem when just installing, and along with the use of transformer; Aging seepage slowly appears in reasons such as weather reason, installing and locating gimmick and regular maintenance, equipment, and is more general on some operation time limits transformer for a long time especially; The phenomenon of transformer seepage transformer oil happens occasionally, in case and the transformer oil seepage, slight leakage pollution can cause the appearance of potential device to dye and the transformer ambient contamination; Heavy then reduction can make that the pasta in the transformer is low excessively, has directly caused sleeve pipe lead-in wire and shunting switch to be exposed in the air, and its dielectric level will reduce greatly; Not only reduced the working life of transformer; And be prone to cause disruptive discharge, and cause the damage of equipment, cause accidents such as large size outage; Electric power system and user are caused great harm and influence, can not satisfy the requirement of current first-class business equipment serviceability rate.More can cause security incidents such as fire when serious, cause the loss of personnel's property.
And through practice and exploring; We add up and investigate the back discovery to the distribution transformer (electric pressure is 10KV and following) that seepage oil situation takes place for all; The main cause that causes transformer seepage transformer oil is that the aging generation of cracks of the seal ring of rubber system causes transformer oil to ooze out; And in the transformer running, have following factor to cause the aging of seal ring, they are respectively:
1. transformer oil
Transformer oil is in operation at oil-immersed power transformer; The upper strata of transformer oil oil temperature can reach usually 80 ℃ or more than, and existing seal ring long-term contact with high temperature oil can accelerated material wear out, cause seal ring to compress bounce-back rate variation; And when oily temperature drop is low; Seal ring can't return to original shape, thereby transformer seepage oil situation appears in the generation of cracks phenomenon.
2. ozone
At range transformer, switch, capacitor and bus equipment, it owing to reasons such as weather, mounting points, touches materials such as malaria, dust through regular meeting in running; More or less all can produce electric discharge phenomena not of uniform size, just have ozone generating as long as electric phenomenon takes place, and in the said apparatus; It is more lasting that oil-immersed power transformer receives the influence of ozone; Ozonization is the one of the main reasons that causes rubber product aging, owing to contain carbon-carbon double bond in the rubber product, and ozone can make the carbochain fracture with the rubber reaction; Cause rubber to follow the string, aging and generation of cracks.
3. ultraviolet ray
For the outdoor box power distribution station, the oil-immersed power transformer of its outfit also can receive the ultraviolet direct irradiation infringement of sunlight except meeting receives the pollution of ozone.Because transformer receives solar radiation for a long time, the ultraviolet ray in the sunlight but can not be absorbed by rubber, so can directly damage seal ring, causes the seal ring accelerated ageing to produce be full of cracks.
And in recent years; Domestic a lot of power department and transformer manufactory all pay special attention to the development and the selection of rubber seal products; And each rubber seal products manufacturer has also all developed the rubber seal products of various series in succession for adapting to the transformer development need.According to research experience for many years, use checking and technological achievement, the rubber clone that transformer manufacturing firm can select to be used in the transformer sealing has: nitrile butadiene rubber, ACM, neoprene, fluorine rubber, ethylene propylene diene rubber, silicone rubber or the like.Rubber differs from one another because of structure of molecule is different, the polymerization different table reveals anisotropy.
In above many glue kinds, fluorine rubber is that each item performance is best, but because of its price is more expensive, seldom at transformer, uses on the mutual inductor, generally on switch, adopts.Nitrile butadiene rubber is used for distribution transformer because of its moderate cost by most transformer factory.But because of the nitrile butadiene rubber self attributes has determined that its ozone-resistant aging property is relatively poor.The oil resistance of neoprene is poor than nitrile butadiene rubber, and compression set is bigger.It has irresistible shortcoming to ACM because of its structure of molecule determinism, and promptly the rubber cross degree is low, and when causing rubber at high temperature to bear elongation or compressive strain, stress relaxation and metaboly are remarkable.This glue kind price is more expensive in addition, does not possess optimum price performance.
Though in the above-mentioned material; Though comparing other rubber, nitrile butadiene rubber has the highest cost performance; But its oil resistance; Compressing not permanent deformation performance, heat resistance, winter hardiness, ozone resistance, sun-resistant degree, is not optimal sealing material, therefore is the main cause that causes transformer seepage oil.And other neoprene and fluorine rubber have certain ozone resistance; But ozone is the natural enemy of rubber after all, no matter uses which kind of rubber, and no matter how performance is improved; It not optimal sealing material; Ozone still has certain corrosivity to rubber, can quicken the aging of rubber material, so the problem of material itself is the main cause that causes transformer seepage oil.
In sum, the various seal rings under the existing technology all can't satisfy the demand of residing working environment of existing oil-immersed power transformer and state fully so long as rubber is made, have caused sealing effect not good, leakiness wet goods defective.
And must have following characteristics in order to address the above problem required new material:
1. suitable hardness and less compression set performance, thus guarantee that seal ring has elasticity and permanent sealing effect.
2. high-and low-temperature resistance performance and weather-resistant performance preferably, thus working life of seal ring guaranteed.
3. ozone-resistant aging property is good, should have stronger prevention crack propagation ability especially, thereby guarantees the working life of seal ring.
4. good oil resistance, the immersion of high temperature oil in the time of resisting the transformer operation guarantees that volume, the weight rate of seal ring is little.Just the oil resistant sealing effect of seal ring will keep permanent.
5. anti-anti-ultraviolet property will be got well, and can resist the invasion and attack of the ultraviolet ray (270～400 mu m waveband) under the daylight, makes seal ring not produce be full of cracks, guarantees effective seal.
Summary of the invention
In order to solve the Sealing poor effect of the oil-immersed power transformer under the existing technology; Cause transformer oil to leak; And adopt traditional nitrile butadiene rubber to satisfy not the problem that requires; The invention provides a kind of oil-immersed power transformer with cork-rubber mixing seal ring, its concrete structure is described below:
A kind of oil-immersed power transformer comprises the nitrile butadiene rubber that constitutes seal ring coil with cork-rubber mixing seal ring, it is characterized in that:
In the nitrile butadiene rubber of described formation seal ring coil, be doped with granulated cork.
A kind of oil-immersed power transformer according to the present invention is characterized in that with cork-rubber mixing seal ring described granulated cork is distributed in the nitrile butadiene rubber, and the ratio of nitrile butadiene rubber and granulated cork is 1: 1～1: 0.85.
A kind of oil-immersed power transformer according to the present invention is characterized in that with cork-rubber mixing seal ring the order number of said granulated cork is 20 orders～40 orders.
A kind of oil-immersed power transformer according to the present invention is characterized in that with cork-rubber mixing seal ring the size of grain of said granulated cork is 0.5～1.5mm.
A kind of oil-immersed power transformer according to the present invention is characterized in that with cork-rubber mixing seal ring described seal ring coil, its external diameter are 34mm～85mm, and internal diameter is 19mm～58mm, and thickness is 6mm～15mm.
A kind of oil-immersed power transformer according to the present invention is with cork-rubber mixing seal ring; It is characterized in that; Said oil-immersed power transformer is with the tensile strength＞2.4MPa of cork-rubber mixing seal ring, elongation at break＜70%, compression set rate＜50%; Tensile strength change＞58%, and make transformer oil medium consumption factor variance ratio＜50%.
Use a kind of oil-immersed power transformer of the present invention to obtain following beneficial effect with cork-rubber mixing seal ring:
1. the present invention is through the characteristics of its rubbery cork particle composite material mixed itself; Make that the oil-immersed power transformer process is big with the compressibility of cork-rubber mixings seal ring, good, the existing higher hardness of compression recovery property, tensile strength have again higher, distortion adaptability is bigger, the hardness regulation range is also big, can keep the long term use and do not change its performance and have good good insulation performance performance.
2. the material price of composite of the present invention is lower than the average price of rubber; Especially well below the fluorine rubber of better performances; Greatly reduce cost the distribution transformer in many power distribution stations and box-type substation (electric pressure is at 10KV and following), and the present invention can improve the quality of sealing material, when prolonging the working life of sealing material; Ride quality that can also stabilizing transformer improves the power supply reliability of electrical network greatly.
3. though the sealing material that rubbery cork particle composite material mixed of the present invention is processed is to design to the transformer operating conditions; But the operating conditions of many electrical equipments such as rheology, switch etc. and the operating conditions of transformer are approximate; So the sealing material that this composite material is processed not only can be used on the transformer, can also on a lot of electrical equipments, use, promptly reduced the price of sealing material; Can improve its sealability again; The status of instead of rubber in electrical equipment progressively becomes the main sealing material of transformer ' s type and electric type equipment, and its application surface very extensively.
Description of drawings
Fig. 1 is that a kind of oil-immersed power transformer of the present invention is with cork-rubber mixing seal ring concrete structure plan view;
Fig. 2 is that a kind of oil-immersed power transformer of the present invention is with cork-rubber mixing seal ring concrete structure side view
Fig. 3 is the sectional drawing of a kind of oil-immersed power transformer of the present invention with cork-rubber mixing seal ring concrete structure side-looking face;
Fig. 4 is the preparation process flow chart of a kind of oil-immersed power transformer of the present invention with cork-rubber mixing seal ring;
Fig. 5 is the concrete mounting point schematic representation of a kind of oil-immersed power transformer of the present invention with cork-rubber mixing seal ring.
Among the figure: A-seal ring coil, B-granulated cork, 1-oil discharging valve, 2-fuel tank, 3-shunting switch, 4-low-tension bushing, 5-bushing, 6-gas relay, 7-pressure-relief vent, 8-oil meter, 9-oil conservater, 10-dehydrating breather, 11-probe.
Embodiment
To shown in Figure 3, a kind of oil-immersed power transformer of the present invention is with cork-rubber mixing seal ring like Fig. 1, and it focuses on granulated cork B doping is uniformly distributed with to nitrile butadiene rubber; With its seal ring coil A that is mixed and made into, overcome the General Purpose Rubber seal ring under the existing technology, yielding; Be prone to shortcomings such as leakage, wherein, granulated cork is selected from the cork of cork oak; Cork oak is commonly called as the cork oak, and the cork of this kind seeds is called cork again, is to peel next bark from the cork robur; Because the phellem layer of this bark is flourishing especially, claim cork.With the product that cork is processed into, the common name cork article.And select the crust products of the very flourishing seeds of cork-kind of plant phellem layer as green material why, and be the surface protection tissue after stem and the root diameter increment, the reasons are as follows of this material:
1. cork is made up of the pinacocyte of many radiation arrangements.Often contain resin and tannin compound in the cell cavity, be full of air in the cell cavity, thereby the cork quality is light and soft, high resilience, waterproof, be not subject to the effect of chemicals, and be the poor conductor of electricity, hot harmony.This structure makes the cork leatherware that extraordinary elasticity, sealing, thermal insulation, sound insulation property, electrical insulating property and rub resistance arranged, add nontoxic, tasteless, proportion is little, advantage such as soft, does not still have artificial product to match in excellence or beauty with it so far.The anti-ozone of cork, rotten, the resistance to chemical attack of corrosion resistant do not chemically react to water, grease, gasoline, organic acid, salt, ester class etc.
2. therefore cork cells fill air has the one-way of compressive strain-----promptly when the compression pressurized, only deforms at compression direction, laterally and direction less deformed then.After pressure solutions was removed, compressed air expansion will make compressed caliper recovery.
Below in conjunction with accompanying drawing and embodiment a kind of oil-immersed power transformer of the present invention is done further description with cork-rubber mixing seal ring.
Embodiment
A kind of oil-immersed power transformer of the present invention is with cork-rubber mixing seal ring, and its preparation process is as shown in Figure 4:
At first rubber (being nitrile butadiene rubber) is plasticated, and then carry out rubber and refining with the plastics (promptly plastifying sizing material) after plasticizing, then (nitrile butadiene rubber is 1: 1～1: 0.85 with the ratio of granulated cork) interpolation chemical industry auxiliary material and treated granulated cork (promptly being decomposed into the granular granulated cork that is of a size of 0.5～1.5mm) carry out mixing in proportion; The order number that should note granulated cork here should be 20 orders～40 orders; Mixing end confirms that (external diameter of seal ring coil is 34mm～85mm to size, and the internal diameter of seal ring coil is 19mm～58mm, and the thickness of seal ring coil is that 6mm～15mm) the blank sheet is accomplished in the back after overaging is handled to reach; Add vulcanzing agent this moment again; Carry out cross-linking vulcanizedly with the blank sheet, behind the sulfidization molding, do preliminary test; Then pack warehouse-in like no problem, to be used.
Oil-immersed power transformer after completing distributes like Fig. 1～shown in Figure 3 with cork-rubber mixing seal ring concrete structure-seal ring coil A and granulated cork B, then with oil-immersed power transformer of the present invention with cork-rubber mixing seal ring, choose different sizes each oil-immersed power transformer be assembled to the oil discharging valve 1 among Fig. 5 with cork-rubber mixing seal ring; Fuel tank 2, shunting switch 3, low-tension bushing 4; Bushing 5, gas relay 6, pressure-relief vent 7; Oil meter 8; Oil conservater 9, dehydrating breather 10 and probe 11 places can use.
Table 1 oil-immersed power transformer of the present invention is with cork-rubber mixing seal ring parameters index
Shown in above-mentioned table 1; Oil-immersed power transformer of the present invention is with the granulated cork that is adopted of cork-rubber mixing seal ring and the nitrile butadiene rubber rubbery cork particle composite material mixed processed of other compounds in addition; Compare with the common rubber system seal ring under the existing technology; The major advantage that had both kept rubber can solve the unconquerable shortcoming of General Purpose Rubber again.
Oil-immersed power transformer of the present invention is applicable to various oil immersed transformers field with cork-rubber mixing seal ring; Change its operating conditions; Both reduced the price of sealing material, can improve its sealability again, progressively the status of instead of rubber in electrical equipment; Become the main sealing material of transformer ' s type and electric type equipment, its application surface very extensively.
Claims (6)
1. an oil-immersed power transformer comprises the nitrile butadiene rubber that constitutes seal ring coil (A) with cork-rubber mixing seal ring, it is characterized in that:
In the nitrile butadiene rubber of described formation seal ring coil (A), be doped with granulated cork (B).
2. a kind of oil-immersed power transformer as claimed in claim 1 is characterized in that with cork-rubber mixing seal ring described granulated cork (B) is distributed in the nitrile butadiene rubber, and the ratio of nitrile butadiene rubber and granulated cork is 1: 1～1: 0.85.
3. a kind of oil-immersed power transformer as claimed in claim 1 is characterized in that with cork-rubber mixing seal ring the order number of said granulated cork (B) is 20 orders～40 orders.
4. a kind of oil-immersed power transformer as claimed in claim 1 is characterized in that with cork-rubber mixing seal ring the size of grain of said granulated cork (B) is 0.5～1.5mm.
5. a kind of oil-immersed power transformer as claimed in claim 1 is characterized in that with cork-rubber mixing seal ring described seal ring coil (A), its external diameter are 34mm～85mm, and internal diameter is 19mm～58mm, and thickness is 6mm～15mm.
6. a kind of oil-immersed power transformer as claimed in claim 1 is with cork-rubber mixing seal ring; It is characterized in that; Said oil-immersed power transformer is with the tensile strength＞2.4MPa of cork-rubber mixing seal ring, elongation at break＜70%, compression set rate＜50%; Tensile strength change＞58%, and make transformer oil medium consumption factor variance ratio＜50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104221527A CN102494135A (en) | 2011-12-15 | 2011-12-15 | Cork and rubber mixed sealing ring for oil-immersed power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104221527A CN102494135A (en) | 2011-12-15 | 2011-12-15 | Cork and rubber mixed sealing ring for oil-immersed power transformer |
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| Publication Number | Publication Date |
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| CN102494135A true CN102494135A (en) | 2012-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104221527A Pending CN102494135A (en) | 2011-12-15 | 2011-12-15 | Cork and rubber mixed sealing ring for oil-immersed power transformer |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2580474B2 (en) * | 1993-09-02 | 1997-02-12 | ダイナガ株式会社 | Cork sheet for gasket |
| CN1049234C (en) * | 1994-12-28 | 2000-02-09 | 华东理工大学 | Fibre-reinforced cork rubber sealing material and preparation technology thereof |
| JP2005201302A (en) * | 2004-01-13 | 2005-07-28 | Toyoda Gosei Co Ltd | Cork containing rubber gasket |
| CN101134889A (en) * | 2007-08-15 | 2008-03-05 | 安阳市鑫河科技研究院有限责任公司 | Modified acrylonitrile butadiene packing material and preparation method thereof |
| CN101384666A (en) * | 2006-02-13 | 2009-03-11 | 瓦克聚合***两合公司 | Process for producing mouldings from cork particles |
-
2011
- 2011-12-15 CN CN2011104221527A patent/CN102494135A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2580474B2 (en) * | 1993-09-02 | 1997-02-12 | ダイナガ株式会社 | Cork sheet for gasket |
| CN1049234C (en) * | 1994-12-28 | 2000-02-09 | 华东理工大学 | Fibre-reinforced cork rubber sealing material and preparation technology thereof |
| JP2005201302A (en) * | 2004-01-13 | 2005-07-28 | Toyoda Gosei Co Ltd | Cork containing rubber gasket |
| CN101384666A (en) * | 2006-02-13 | 2009-03-11 | 瓦克聚合***两合公司 | Process for producing mouldings from cork particles |
| CN101134889A (en) * | 2007-08-15 | 2008-03-05 | 安阳市鑫河科技研究院有限责任公司 | Modified acrylonitrile butadiene packing material and preparation method thereof |
Non-Patent Citations (6)
| Title |
|---|
| 李卿: ""软木橡胶"", 《机车电传动》 * |
| 王新剑: ""软木橡胶制品"", 《机车电传动》 * |
| 祝振鹏等: "变压器用软木橡胶密封制品的研制", 《特种橡胶制品》 * |
| 祝景仲: ""一种新型密封材料"", 《吉林电力技术》 * |
| 谢苏江等: "软木橡胶密封材料的研制", 《橡胶工业》 * |
| 谢苏红等: "纤维增强软木橡胶密封材料的研制", 《特种橡胶制品》 * |
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Owner name: STATE ELECTRIC NET CROP. Effective date: 20121015 |
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Effective date of registration: 20121015 Address after: 200122 Shanghai City, Pudong New Area source deep road, No. 1122 Applicant after: Shanghai Electric Power Corporation Applicant after: State Grid Corporation of China Address before: 200122 Shanghai City, Pudong New Area source deep road, No. 1122 Applicant before: Shanghai Electric Power Corporation |
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Application publication date: 20120613 |