CN105276192A - Manufacturing method for carbon-graphite floating ring - Google Patents
Manufacturing method for carbon-graphite floating ring Download PDFInfo
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- CN105276192A CN105276192A CN201410546527.4A CN201410546527A CN105276192A CN 105276192 A CN105276192 A CN 105276192A CN 201410546527 A CN201410546527 A CN 201410546527A CN 105276192 A CN105276192 A CN 105276192A
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Abstract
The invention discloses a manufacturing method for a carbon-graphite floating ring. According to the manufacturing method, combination surfaces of a graphite ring and a peripheral metal inlaid ring are combined reliably, thermal conductivity and electrical conductivity are good, and no blister scar is generated. According to the technical scheme for implementing the manufacturing method, the carbon-graphite ring and the metal inlaid ring which have working allowances are processed firstly, and the carbon-graphite ring is in interference fit with the metal inlaid ring; then the metal inlaid ring is heated to 280-320 DEG C in a heating furnace, the carbon-graphite ring is rapidly arranged in the metal inlaid ring in the interference fit mode, and the carbon-graphite ring and the metal inlaid ring are cooled naturally; afterwards, a floating ring assembly formed after inlaying is placed in a vacuum reaction kettle, thermosetting resin is added, micro gaps between the carbon-graphite ring and the metal ring are fully filled with the thermosetting resin, and the thermosetting resin is sintered at a high temperature to be completely carbonized; and finally finish machining is carried out, and the finished floating ring is obtained. Through the manufacturing method, the problems that according to a traditional process, the carbon-graphite ring and the metal inlaid ring are combined through high-temperature adhesive, a great number of gaps are formed between combination surfaces, and leakage occurs to the combination position under high pressure are solved.
Description
Technical field
The present invention relates to a kind of preparation method of carbon graphite floating ring floating ring.
Background technique
Along with the raising of equipment parameters, now adopt the hard seal ring be made up of carbon-graphite antifriction material in a large number, reliably work in unlubricated dose and high-speed and high-temperature or Korrosionsmedium with guarantee equipment. at steam turbine gas turbine, piston type or turbo-compressor, steamer, pump, gas compressor, submersible pump, clean waterpump, core two pole pump, boiler feed pump, dryer, textile printing and dyeing machine, water pump, heat setting machine, canned motorpump separator, deduster, steam flow meter, high-temperature hot oil pump, airplane engine, fuel tank, starting electrical machinery, cigarette machine, blower fan, clutch device, steam turbine, soda ash calcining machine stove, centrifugal pump, compressor, vacuum pump, fermenting tub water turbine, printing machinery vacuum pressed air pump gas compressor, in rotary engine and various chemical industry equipment, carbon graphite seal ring is used widely.General graphite material has the advantages such as good self lubricity, wear resistance, thermal conductivity, temperature tolerance, but also has the defects such as mechanical strength is low.When therefore using under the environment of high temperature, high pressure, generally also to do some technologic enhancement process to independent carbon graphite floating ring, as inlayed ring 1 in the outside of carbon graphite floating ring parcel layer of metal, the carbon graphite floating-ring seal of this structural type, is referred to as floating-ring seal.Floating-ring seal belongs to the contactless motive sealing of flow resistance type, is rely on the fluid resistance effect in seal clearance and reach Drain Resistance object.Owing to there is gap, avoid solid friction, be applicable to high-speed case, can shutoff liquid, also can shutoff gas, but amount of leakage is comparatively large, also must configure the sealing auxiliary system of more complicated in some cases.Float ring seal is called for short floating-ring seal, for shaft seals such as centrifugal compressor, hydrogen-cooled turbo-generator, centrifugal pumps.Floating seal is salable liquid both, also salable gas.Liquid film floating-ring seal is called in order to what stop fluid leakage; Dry type floating-ring seal is called, because floating ring is usually by solid self lubricant material manufactures such as graphite, therefore also known as graphite floating-ring seal for what stop gas leakage.Graphite floating-ring seal: the elastic force of corrugated sheet spring and gas pressure make each floating ring end face fit tightly with an end face of each isolating ring respectively, group stops gas radially to be revealed, and rotate through a small amount of gas that float ring seal spills vertically by arranging blank discharge by the anti-stop ring of frictional force of end face, or cause the gas inlet of main frame.The working clearance of graphite floating-ring seal is not definite value, but with frictional heating situation from Row sum-equal matrix, therefore have the title of " hot self-regulated clearance seal ".Graphite anti-corrosion, heat-resisting, but it is too crisp, easy-rupturing under Radial Loads.In centrifugal compressor, have employed graphite and make floating ring, in order to prevent fracture, the periphery of graphite annulus of being everlasting studs with metal edge ring 1. floating ring can multiple use arranged side by side, and composition multilayer floating ring, effectively can seal the high pressure of more than 10MPa.Can be used for the High Rotation Speed fluid machinery of 10000 ~ 20000r/min, especially be used in gas compressor, its speed allowable is up to more than 100m/s, and this is that other sealings can not be compared.The shortcoming of floating-ring seal: the accuracy of manufacturing of Sealing requires high, there is obvious impact on the nonconcentricity of ring and the non-perpendicularity of end face and surface not roughness on sealability.Its broad form of floating ring has: smooth ring and trip ring.Smooth ring and trip ring.The endoporus of smooth ring is smooth; The endoporus total length fluting of slotted ring or part fluting.Because in the gap on smooth ring and axle surface, hydraulic friction is less, in using, return back out existing larger amount of leakage.The endoporus of slotted ring is processed with many roads circular groove, comparatively large with hydraulic friction in the gap of axle, under same pressure reduction and same width, amount of leakage is less than smooth ring, particularly can accomplish at high speed and not leak completely, liquid film forming is also very stable, effectively can play seal action.So for high speed rotating shaft, slotted ring is better than smooth ring, as smooth floating-ring seal and mechanical seal made comparisons, when low speed, the amount of leakage of mechanical seal is less, and at a high speed, then smooth ring is less, and therefore, high speed rotating sealing should use light slip ring.But when speed is too high, due to the viscosity retardation of sealing oil, sealing oil can be generated heat.In order to dispel the heat, usually have a mind to keep certain amount of leakage.And amount of leakage is except outside the Pass having with the form of ring, also relevant with the characteristic of movement velocity, oil, entrance oil temperature and atmospheric temperature etc.
Traditional floating ring processing method first processes carbon graphite floating ring and metal edge ring 1 (all leaving machining allowance) respectively, Spielpassung is adopted between carbon graphite floating ring and steel part, then by high-temp glue, two-part are combined, after glue fully solidifies, then fine finishing assembly parts.The deficiency of tratitional technology is, combined by high-temp glue between carbon graphite floating ring and metal edge ring 1, have a lot of gap between junction plane, under high-pressure situations, junction can be leaked.In addition, due to carbon graphite floating ring initial operating stage, sealing air film is not also formed, a large amount of heats can be produced because of friction between carbon graphite floating ring and axle, rubbing surface local pyrexia phenomenon, local temperature is at 200-310 DEG C, and the carbocyclic ring combined by high-temp glue and metal edge ring 1, because be Spielpassung, carbon graphite floating ring and metal edge ring 1 are each other just by there being the point cantact in the place of high-temp glue, and high-temp glue not heat conduction, non-conductive, under this temperature conditions, thermosetting resin in graphite-seal ring will react, discharge a large amount of gas, thermosetting resin volume starts to shrink and forms multiple spot pit, thus there is blister scar phenomenon.Blister scar phenomenon is the modal failure mode of carbon graphite floating-ring seal, and its Crack cause is more, but searches to the bottom or the heat of rubbing surface does not in time derive and goes.Thermal expansion coefficient again due to carbon, graphite material is less, and the thermal expansion coefficient of metal edge ring 1 material is larger, Spielpassung is put into carbon, graphite annulus and metal edge ring 1 by high-temp glue and is sticked together by tratitional technology, there is gap each other, when serviceability temperature is higher, because both thermal expansion coefficient are inconsistent, probably form new gap, in addition itself original gap, the leakage rate of meeting larger production, even occur loosening between carbon, graphite annulus and metal edge ring, come off, thus make seal failure.
Summary of the invention
The present invention seeks to the deficiency existed for above-mentioned prior art, provide a kind of graphite annulus and periphery metal to inlay between ring 1 junction plane and combine reliably, heat conduction, good conductivity, and the preparation method that can not produce the carbon graphite floating ring of blister scar.
Above-mentioned purpose of the present invention can be reached by following measures, a kind of preparation method of carbon graphite floating ring, it is characterized in that comprising the steps: first to process the carbon graphite floating ring 2 and metal edge ring 1 that leave machining allowance, interference fit is adopted between carbon graphite floating ring and metal edge ring 1, then metal is inlayed ring 1 in oven and be heated to 280-320 degree, and fast carbon graphite floating ring is interference fitted in metal edge ring 1, it is allowed naturally to cool, again the floating ring assembly formed after insert is put into vacuum reaction still, add thermosetting resin, allow its fully fill carbon graphite floating ring 2 and metal edge ring 1 between microscopic gaps, and high temperature sintering, allow its carbonization, last fine finishing again, obtain the finished product of floating ring.
The present invention has following useful outstanding effect compared to prior art:
1, tightness is good.Through interference fit between metal edge ring 1 of the present invention and carbon graphite floating ring, and carry out thermosetting resin filling, carbonization treatment in a kettle. after insert, after the micro-pore between surface of contact is filled, ensure that the overall impermeability of part.Thus solve in tratitional technology, and combined by high-temp glue between carbon graphite floating ring and metal edge ring 1, between junction plane, have a lot of gap, under high-pressure situations, the problem that junction can be leaked.
2, heat conduction, good conductivity.Carbon graphite floating ring of the present invention fully contacts through interference fit with metal edge ring 1, the heat that rubbing surface produces can be passed by metal edge ring 1 very soon, blister scar phenomenon can not be produced because of localized hyperthermia, overcome between carbon graphite floating ring and axle because friction produces a large amount of heats, rubbing surface local pyrexia, in graphite-seal ring, thermosetting resin reacts and discharges a large amount of gas, and thermosetting resin volume shrinkage forms the blister scar phenomenon of multiple spot pit, thus improves heat conduction, the electric conductivity of floating ring.
3, Thermal Synthetic expansion coefficient is good.The carbon graphite floating ring that the present invention adopts interference fit to link together and metal edge ring 1, after filling the technique such as gap, carbonization treatment packing, very close to each other between carbon, graphite annulus and metal edge ring 1, stick together each other, when using in high temperature environments, due to mutually pining down between the two, define the thermal expansion coefficient of a comprehensive bi-material, its value is larger than the Coefficient of Thermal Expansion value of carbon graphite material, less than the Coefficient of Thermal Expansion value of metal edge ring 1.This just well decreases product leakage, and assembly loosens mutually, the appearance of obscission, can the more effective effect playing sealing.
Accompanying drawing explanation
Fig. 1 is the organigram of carbon graphite floating ring 2 of the present invention.
Fig. 2 is that the I of figure is to close-up schematic view.
Embodiment
Consult Fig. 1, Fig. 2.Carbon graphite floating ring 2 is made up of two-part, and at the outside of carbon graphite floating ring parcel layer of metal edge ring 1, inside is carbon graphite seal ring, and outside is rustless metal edge ring 1.In order to form air film as early as possible in the process of running, better playing sealing effect, in carbon graphite floating ring 2, annular sulculus or multiple thread can be shaped with.First process the carbon graphite floating ring and metal edge ring 1 that leave machining allowance, interference fit is adopted between carbon graphite floating ring and metal edge ring 1, the large I of magnitude of interference adjusts according to the size of carbon graphite floating ring 2 product and serviceability temperature, size as carbon graphite floating ring 2 is larger, magnitude of interference is also larger, final serviceability temperature is higher, and the heating-up temperature of metal edge ring 1 in oven is higher.Then metal is inlayed ring 1 in oven and be heated to 280 DEG C-320 DEG C, and fast carbon graphite floating ring is interference fitted in metal edge ring 1, allow it naturally cool, then after fully cooling, vacuum reaction still put into by the floating ring assembly formed after insert, add thermosetting resin, allow it fully fill microscopic gaps between carbon graphite floating ring and metal edge ring 1, and high temperature sintering, allow its carbonization, last fine finishing again, obtains the finished product of floating ring.
Owing to have passed through a series of high temperature processing, must carry out to assembly the crash handling eliminating internal stress, finally fine finishing again, obtains the finished product of floating ring.
Claims (3)
1. the preparation method of a carbon graphite floating ring, it is characterized in that comprising the steps: first to process the carbon graphite floating ring (2) and metal edge ring (1) that leave machining allowance, interference fit is adopted between carbon graphite floating ring and metal edge ring (1), then metal is inlayed ring (1) in oven and be heated to 280-320 degree, and fast carbon graphite floating ring is interference fitted in metal edge ring (1), it is allowed naturally to cool, again the floating ring assembly formed after insert is put into vacuum reaction still, add thermosetting resin, it is allowed fully to fill microscopic gaps between carbon graphite floating ring and metal edge ring (1), and high temperature sintering, allow its carbonization, last fine finishing again, obtain the finished product of floating ring.
2. the preparation method of carbon graphite floating ring as claimed in claim 1, is characterized in that: the size of magnitude of interference adjusts according to the size of carbon graphite floating ring (2) product and serviceability temperature.
3. the preparation method of carbon graphite floating ring as claimed in claim 1, is characterized in that: the size of carbon graphite floating ring (2) is larger, and magnitude of interference is also larger, and metal edge ring (1) heating-up temperature in oven is higher.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410546527.4A CN105276192A (en) | 2014-10-16 | 2014-10-16 | Manufacturing method for carbon-graphite floating ring |
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| CN201410546527.4A CN105276192A (en) | 2014-10-16 | 2014-10-16 | Manufacturing method for carbon-graphite floating ring |
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| CN105276192A true CN105276192A (en) | 2016-01-27 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107327571A (en) * | 2017-06-15 | 2017-11-07 | 中国科学院工程热物理研究所 | Floating-ring seal component with skewed slot |
| US10385713B2 (en) | 2017-08-24 | 2019-08-20 | United Technologies Corporation | Seal assembly for gas turbine engines |
| CN110555288A (en) * | 2019-09-25 | 2019-12-10 | 中国石油大学(华东) | Method and system for determining axial load of graphite packing ring for static coupling seal |
| US11248492B2 (en) | 2019-03-18 | 2022-02-15 | Raytheon Technologies Corporation | Seal assembly for a gas turbine engine |
| CN114310158A (en) * | 2021-12-02 | 2022-04-12 | 美尔森先进石墨（昆山）有限公司 | Graphite and metal composite sealing ring and manufacturing process thereof |
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| CN86209556U (en) * | 1986-11-25 | 1988-03-16 | 中国科学院山西煤炭化学研究所 | High-temp and high-pressure flexible graphite sealing ring |
| CN1076468A (en) * | 1992-03-14 | 1993-09-22 | 隋作训 | Graphite-metal base composite sealing material and manufacture craft |
| CN2204358Y (en) * | 1994-04-06 | 1995-08-02 | 丹东市波纹管机械密封厂 | Bellows mechanical sealing for petro-chemical pump |
| CN101251189A (en) * | 2007-12-21 | 2008-08-27 | 浙江国泰密封材料股份有限公司 | Netted metallic reinforced sealing plate and producing method thereof |
| CN201891742U (en) * | 2010-08-05 | 2011-07-06 | 钱尉兵 | Bearing sealing sleeve made of graphite |
| CN202402644U (en) * | 2011-12-31 | 2012-08-29 | 中国燃气涡轮研究院 | Floating ring sealing device |
| CN102996806A (en) * | 2012-12-07 | 2013-03-27 | 辽宁天泽产业集团机械制造有限公司 | Brittle-fracture-resistant large-diameter graphite stationary ring for mechanical seal and manufacturing method of graphite stationary ring |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN86209556U (en) * | 1986-11-25 | 1988-03-16 | 中国科学院山西煤炭化学研究所 | High-temp and high-pressure flexible graphite sealing ring |
| CN1076468A (en) * | 1992-03-14 | 1993-09-22 | 隋作训 | Graphite-metal base composite sealing material and manufacture craft |
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| CN102996806A (en) * | 2012-12-07 | 2013-03-27 | 辽宁天泽产业集团机械制造有限公司 | Brittle-fracture-resistant large-diameter graphite stationary ring for mechanical seal and manufacturing method of graphite stationary ring |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107327571A (en) * | 2017-06-15 | 2017-11-07 | 中国科学院工程热物理研究所 | Floating-ring seal component with skewed slot |
| CN107327571B (en) * | 2017-06-15 | 2018-09-11 | 中国科学院工程热物理研究所 | Floating-ring seal component with skewed slot |
| US10385713B2 (en) | 2017-08-24 | 2019-08-20 | United Technologies Corporation | Seal assembly for gas turbine engines |
| US11248492B2 (en) | 2019-03-18 | 2022-02-15 | Raytheon Technologies Corporation | Seal assembly for a gas turbine engine |
| CN110555288A (en) * | 2019-09-25 | 2019-12-10 | 中国石油大学(华东) | Method and system for determining axial load of graphite packing ring for static coupling seal |
| CN110555288B (en) * | 2019-09-25 | 2023-04-18 | 中国石油大学(华东) | Method and system for determining axial load of graphite packing ring for static coupling seal |
| CN114310158A (en) * | 2021-12-02 | 2022-04-12 | 美尔森先进石墨（昆山）有限公司 | Graphite and metal composite sealing ring and manufacturing process thereof |
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Application publication date: 20160127 |