CN104989827A - Mechanical sealing device for pump - Google Patents
Mechanical sealing device for pump Download PDFInfo
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- CN104989827A CN104989827A CN201510336370.7A CN201510336370A CN104989827A CN 104989827 A CN104989827 A CN 104989827A CN 201510336370 A CN201510336370 A CN 201510336370A CN 104989827 A CN104989827 A CN 104989827A
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- Prior art keywords
- ring
- rotating
- sealing device
- silicon carbide
- mechanical sealing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3436—Pressing means
- F16J15/3452—Pressing means the pressing force resulting from the action of a spring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Sealing (AREA)
Abstract
The invention provides a mechanical sealing device for a pump. The mechanical sealing device comprises a rotary shaft, wherein a static ring and a dynamic ring are arranged on the rotary shaft; one end of the dynamic ring is resisted against the static ring; a dynamic ring base and a transmission ring are further arranged on the rotary shaft; the transmission ring is fixedly connected with the rotary shaft; the front end of the dynamic ring base is connected with the dynamic ring; a first ring-shaped pit is formed in the rear end of the dynamic ring base; a spring is arranged on the outer surface of the rotary shaft is a surrounding mode; the spring is positioned in the first ring-shaped pit; one end of the spring is resisted against the first ring-shaped pit; the other end of the spring is resisted against the transmission ring; a tightening plate is axially arranged at one side of the transmission ring; the tightening plate is resisted against the dynamic ring base; a tightening bolt is arranged on the tightening plate; and the tightening bolt penetrates through the tightening plate and the transmission ring and then is resisted against the rotary shaft. The mechanical sealing device is optimized in structure, relatively convenient to dismount due to reduction of parts, and low in processing precision requirement. Moreover, the dynamic ring is made of a hard material and the static ring is made of a hard or soft material, so that fitting-up effect between the dynamic ring and the static ring is improved, the sealing reliability is guaranteed, and the service lives of the dynamic ring and the static ring are prolonged.
Description
Technical field
The invention belongs to sealing system technical field, relate to a kind of mechanical sealing device used for pump.
Background technique
Mechanical seal for pump belongs to one of accurate, that structure is comparatively complicated machine foundation element, is the critical component of pump machines.Its sealability and working life depend on many factors, as precision, correct the installing and using of type selecting, machine.Mechanical seal for pump is of a great variety, and model is different, and its maintenance is also difficult to debate not and judges.
Traditional mechanical sealing device used for pump, a kind of pump light container type mechanical sealing as disclosure of the invention that Authorization Notice No. is CN 2014696339U, comprise the sealing axle sleeve be directly set on bearing, sealing axle sleeve is provided with rotating ring abrading block and stationary ring abrading block, the front end of rotating ring abrading block contacts with the rear end of stationary ring abrading block, rotating ring abrading block rear end is connected with rotating ring bellows, rotating ring skeleton is provided with outside rotating ring bellows, rotating ring skeleton all breaks and is provided with spring attachment, described stationary ring abrading block front end is provided with stationary ring rubber skeleton, described stationary ring rubber skeleton is arranged on sealing axle sleeve, there are following problems in this mechanical seal device, 1, mechanical seal for pump is due to the defect of its severe working environment and machine self, its component loss is larger, fragile, and this mechanical seal component are more, structure is more complicated, dismounting comparatively bothers, the replacing of component and maintenance are all inconvenient, 2, due to complex structure, the required precision of each component when producing and install of mechanical seal is higher, in order to reduce the generation of substandard product, needing to use more high-precision process equipment, causing processing cost to increase, 3, because component are more, it is produced and fabricating cost increases greatly, and the replacing of component and maintenance too increase its follow-up cost, and its manufacturing efficiency is also lower.
In sum, in order to solve the technical problem that above-mentioned mechanical seal exists, need to design the mechanical sealing device used for pump that a kind of structure is simple, easy to assemble, requirement on machining accuracy is lower, cost of production is lower.
Summary of the invention
The object of the invention is the problems referred to above existed for prior art, propose the mechanical sealing device used for pump that a kind of structure is simple, easy to assemble, requirement on machining accuracy is lower, cost of production is lower.
Object of the present invention realizes by following technical proposal: a kind of mechanical sealing device used for pump, comprise rotating shaft, rotating shaft is provided with stationary ring and rotating ring, rotating ring one end is against on stationary ring, rotating shaft is also provided with rotating seat and transmission circle, transmission circle and rotating shaft are connected, rotating seat front end is connected with rotating ring, rear end offers the first circular pit, its outer surface is provided with spring in rotating shaft and spring is positioned at the first annular concave platform hole, spring one end is against on the first circular pit, the other end is against on transmission circle, axially tightening plate is provided with in transmission circle side, tightening plate is against on rotating seat, tightening plate is provided with Cock screw, Cock screw runs through tightening plate and transmission circle and is against in rotating shaft.
In above-mentioned a kind of mechanical sealing device used for pump, rotating ring adopts hard material to make, and stationary ring adopts hard material or soft material to make; Hard material is normal pressure-sintered silicon carbide ceramics material, and soft material is carbon graphite material.
Because pump mostly is conveying flowing medium, there is the features such as level installation, high rotating speed, high pressure, band solid particle, corrosivity is strong.So mechanical sealing device used for pump main material often need to resist solid particle wash away shock, the impact of the unfavorable factor such as seal parameters that sealing surface high temperature abrasion that high rotating speed brings, high pressure are brought is unstable, base structure part is corroded, require higher to mechanical seal seal arrangement.And rotating ring and stationary ring are two vitals ensureing sealing effect in mechanical seal device, but rotating ring rotates with rotating shaft, the end face contacted with stationary ring is easily become the leak point of mechanical seal device by fretting wear, affect sealing effect, therefore, change with regard to needs, not only affect working efficiency and also add maintenance cost.
Therefore, the material of the further optimized fabrication rotating ring of the present invention and stationary ring, the degree that the end face contacted with stationary ring when reduction rotating ring rotates with rotating shaft is worn, ensures the sealing effect between rotating ring and stationary ring, and extends the working life of rotating ring and stationary ring.Rotating ring of the present invention adopts hard material to make, and the cost of soft material is lower, so stationary ring generally adopts soft material to make.But when transport pump flowing medium containing particle or very easily vaporize, crystallization time, in order to the reliability of sealing effect, stationary ring of the present invention further preferably adopt hard material make.
Hard material of the present invention is preferably normal pressure-sintered silicon carbide ceramics material, because thyrite is the best friction pair material found so far, forming a team property is good, not only lightweight (being only 1/5 of tungsten carbide ceramics), ambient temperature mechanical properties, oxidative stability, corrosion resistance and resistance to wear better, friction factor is low, and its mechanical behavior under high temperature (intensity, creep resistance etc.) can be maintained to 1600 DEG C, is hot strength best material in stupalith.
Soft material of the present invention is preferably carbon graphite material, and on the one hand, carbon graphite material is the friction pair material that mechanical seal industry Applicable scope is the widest, and better with the forming a team property of normal pressure-sintered silicon carbide ceramics material of the present invention.On the other hand, the thermal conductivity of carbon graphite material is good (thermal conductivity of carbon is 20-40W/mk, and the thermal conductivity of graphite is 40-128W/mk), is nonmetal middle heat conduction best material, is only second to silver, copper, aluminium; Low (2-6 × 10 of linear expansion coeffcient
-6/ DEG C), be the 1/2-1/4 of metal; Corrosion resistance is good, in atmosphere 400 DEG C below stable, except strong oxidizing property medium (as chloroazotic acid, chromic acid, the concentrated sulphuric scid and halogen), can other acid resistance to, alkali, salt and all organic compounds corrosion; Self lubricity is fabulous, when carbon graphite material and normal pressure-sintered silicon carbide ceramics material group pair, graphite transfers to normal pressure-sintered silicon carbide ceramics material surface, formation graphite and graphite-phase are to the sassafras that rubs, and the sassafras coefficient that rubs is low, graphite and the metal sassafras coefficient that rubs is 0.04-0.05, and under full liquid lubricating condition, friction factor is only 0.008-0.01.Therefore, fabulous to performance with the group of normal pressure-sintered silicon carbide ceramics material.
In above-mentioned a kind of mechanical sealing device used for pump, normal pressure-sintered silicon carbide ceramics material forms primarily of following composition (with weight parts): silicon carbide powder: 100 parts, reinforcing fiber: 20-30 part, sintering aid: 3-5 part.
Due to silicon carbide ceramics of the prior art in fracture process except producing new break surface sorbent surface energy, do not have other endergonic mechanism, therefore, the fracture toughness of silicon carbide ceramics of the prior art is lower.In order to change this present situation, the present invention with the addition of reinforcing fiber and carries out modification in silicon carbide ceramics, silicon carbide ceramics is made to carry out consumed energy by toughening mechanisms such as spike protein gene, fiber-bridged, crack deflection in fracture process, material is made to show as non-brittle fracture, improve the fracture toughness of silicon carbide ceramics, and also strengthen the mechanical properties such as the intensity of silicon carbide ceramics by the strong mechanical performance of reinforcing fiber.
In above-mentioned a kind of mechanical sealing device used for pump, reinforcing fiber is the blend fiber of the arbitrary and composition of silicon carbide fiber in carbon fiber and glass fibre, and silicon carbide fiber accounts for the 50-60% of blend fiber gross mass.
In the reinforcing fiber that the present invention uses, heat resistance and the oxidative resistance of silicon carbide fiber are all better than carbon fiber, and intensity reaches 1960-4410MPa, and strength retention is more than 80% under maximum operation (service) temperature, and modulus is 176.4-294GPa, and chemical stability might as well.And carbon fiber and glass fibre specific strength, specific modulus are higher, it is conventional reinforcing fiber.Therefore, the present invention adopts the arbitrary and silicon carbide fiber in carbon fiber and glass fibre to form blend fiber to carry out modification to silicon carbide ceramics, to obtain preferably mechanical property.Further preferably, when reinforcing fiber adopts carbon fiber and silicon carbide fiber by weight when mixing for 1:1.5, the mechanical property of the silicon carbide ceramics of acquisition is optimum.
In above-mentioned a kind of mechanical sealing device used for pump, sintering aid is one or both in B, C.Commonly use in sintered silicon carbide ceramics in the present invention and add a small amount of sintering aid, have significant promoting effect to the consistency of silicon carbide ceramics.In the present invention, the preferred sintering aid adding B and C mixing composition further, and preferred B accounts for the 8-15% of sintering aid further, in preferable range of the present invention, the consistency of silicon carbide ceramics can be made up to more than 98%, intensity improves more than 5%.
In above-mentioned a kind of mechanical sealing device used for pump, carbon graphite material is middle hardness carbon graphite material.Carbon graphite material is based on carbon, adds quantitative graphite bonding calcining and forms.And according to adding the number of graphite, can be divided into soft, in, hard three kinds of carbon graphite materials.When current selection, ubiquity a kind of tendency, and namely no matter which kind of operating mode adopts hard carbon graphite without exception, thinks that hardness is more high more wear-resisting.But, really not so under some operating mode.When material of forming a team is for pottery, be advisable to select medium-hard carbon graphite material.If when in medium, solid content is more than 5wt%, carbon graphite material then should not as the material of forming a team of mechanical single seal, and Sealing there will be high wear phenomenon and causes leakage.
Because the porosity of graphite is large, generally at 18%-22%.Therefore, the graphite in carbon graphite material of the present invention, before calcination all through immersion treatment, to block pore, improves sealing.And graphite is after impregnating agent immersion treatment of the present invention, becomes airtight goods, has no significant effect thermal conductivity, but intensity, hardness improve a lot.Impregnating agent of the present invention is preferably: the one in epoxy resin, furan, phenolic resin, Babbitt solution, aluminium alloy solution, copper alloy solution, antimony alloy solution, silver alloy solution, glass solution.
In above-mentioned a kind of mechanical sealing device used for pump, preparation process when rotating ring and stationary ring adopt normal pressure-sintered silicon carbide ceramics material to prepare mainly comprises the following steps:
S1, undertaken preparing burden and being mixed to get slip by the constituent of above-mentioned thyrite and parts by weight thereof;
S2, above-mentioned slip is carried out spraying dry make particle, then particle is pressed into base substrate, under inert gas shielding, at 2000-2500 DEG C, finally carries out high temperature sintering obtain rotating ring or stationary ring.
When the present invention adopts normal pressure-sintered silicon carbide ceramics material to prepare rotating ring and stationary ring, the particle diameter of the silicon carbide powder chosen during batching is 0.1-1 μm, and carries out chemical purification, removes silicon and silica.Before adding reinforcing fiber, need to carry out surface modification to reinforcing fiber, because the poor compatibility of reinforcing fiber and silicon carbide powder, have a strong impact on the mechanical property of product without surface treatment.And reinforcing fiber is without surface treatment, and its specific surface area active is little, and surface energy is low, the performance of restriction reinforcing fiber performance.The present invention is to the surface modification treatment preferred surface oxidation processes of reinforcing fiber, simple to operate.After surface modification, improve the surface activity of reinforcing fiber, improve the binding ability of reinforcing fiber and silicon carbide powder, thus improve the combination property of product.
In step S2 of the present invention, spraying dry makes the preferred 80-100 order of grain diameter.
In above-mentioned a kind of mechanical sealing device used for pump, rotating seat comprises the annular seat board vertical with rotating shaft and the fixing lasso with shaft parallel, rotating ring is provided with the first annular boss, rotating ring is against on annular seat board, and fixing lasso and rotating ring outer surface are adjacent to and fixing lasso is against on the first annular boss.
In above-mentioned a kind of mechanical sealing device used for pump, one end adjacent with rotating seat at rotating ring offers the second circular pit, between the second circular pit and rotating shaft, be formed with circular groove, is provided with the dynamic seal ring of twisted rotary shaft in circular groove.
In above-mentioned a kind of mechanical sealing device used for pump, this device also comprises housing, and housing and stationary ring are connected, and stationary ring offers the second annular boss, the second annular boss is provided with static sealing ring and static sealing ring is against on housing.
Compared with prior art, beneficial effect of the present invention is:
1, this mechanical seal device is primarily of the several component composition of rotating shaft, stationary ring, rotating ring, rotating seat and transmission circle, compare existing mechanical seal for pump, it is structurally optimized, overall cooperation is also compacter, the minimizing of component makes dismounting also more convenient, replacing and maintenance are more prone to, and save the plenty of time.
2, because component are less, the requirement on machining accuracy of component is lower, and the quality of fit between component requires also low, therefore, cost of production is lower, simultaneously, the production precision of component easily controls, and the low precision between each component is less, and the precision of mechanical seal entirety is higher.
3, because structure is simple, the production of each component and the cost of assembling less, the user cost of mechanical seal and follow-up maintenance cost are also relatively little.
4, rotating ring of the present invention adopts hard material to make, and stationary ring generally adopts soft material to make, but when transport pump flowing medium containing particle or very easily vaporize, crystallization time, stationary ring also adopts hard material to make, the reliability of raising sealing effect.
5, the formula of the material of the further optimized fabrication rotating ring of the present invention and stationary ring, improve rotating ring and stationary ring mechanical property and between effect of forming a team, not only ensure the reliability sealed, also extend the working life of rotating ring and stationary ring.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view of a preferred embodiment of the present invention.
Fig. 2 is the sectional drawing of rotating seat in a preferred embodiment of the present invention.
Fig. 3 is the sectional drawing of rotating ring in a preferred embodiment of the present invention.
In figure, 100, rotating shaft; 200, stationary ring; 210, the second annular boss; 211, static sealing ring; 300, rotating ring; 310, the first annular boss; 320, the second circular pit; 330, circular groove; 331, dynamic seal ring; 400, rotating seat; 410, annular seat board; 420, fixing lasso; 421, the first circular pit; 500, transmission circle; 510, tightening plate; 511, Cock screw; 600, spring; 700, housing; 710, fixed block.
Embodiment
Be below specific embodiments of the invention and by reference to the accompanying drawings, technological scheme of the present invention is further described, but the present invention be not limited to these embodiments.
As shown in Figure 1, a kind of mechanical sealing device used for pump, comprise rotating shaft 100, rotating shaft 100 is provided with stationary ring 210 and rotating ring 300, rotating ring 300 one end is against on stationary ring 210, rotating shaft 100 is also provided with rotating seat 400 and transmission circle 500, transmission circle 500 and rotating shaft 100 are connected, as shown in Figure 2, rotating seat 400 comprises the annular seat board 410 vertical with rotating shaft 100 and the fixing lasso 420 parallel with rotating shaft 100, fixing lasso 420 front end is connected with rotating ring 300 and rotating ring 300 is against on annular seat board 410 front-end face, fixing lasso 420 rear end offers the first circular pit 421, its outer surface is provided with spring 600 in described rotating shaft 100 and spring 600 is positioned at the first annular concave platform hole, spring 600 one end is against on the first circular pit 421, the other end is against on transmission circle 500, axially tightening plate 510 is provided with in transmission circle 500 side, tightening plate 510 is against on rotating seat 400, tightening plate 510 is provided with Cock screw 511, Cock screw 511 runs through tightening plate 510 and is against in rotating shaft 100 with transmission circle 500, contacted with rotating seat 400 by tightening plate 510, when transmission circle 500 rotates with rotating shaft 100, rotating seat 400 can be made with transmission circle 500 synchronous axial system.
Comparing traditional mechanical seal adopts 600, spring to fix spring 600, herein, spring 600 to be directly installed in the first circular pit 421 and to be against on transmission circle 500, and component reduce to some extent, and installation coordinates simpler, but play due connection effect, meanwhile, traditional retainer compared by transmission circle 500, its structure is also simpler, on the whole, the structure of whole mechanical seal is optimized more, compact.
By the improvement to structure, the requirement on machining accuracy of each component of mechanical seal is decreased, therefore also low to the requirement of process equipment, cost of production obtains corresponding control.
As shown in Figure 1, Figure 3, rotating ring 300 is provided with the first annular boss 310, described fixing lasso 420 is adjacent to rotating ring 300 outer surface and fixing lasso 420 is against on the first annular boss 310, be adjacent to rotating ring 300 outer surface by fixing lasso 420, rotating seat 400 is connected closely with rotating ring 300, rotating ring 300 can servo-actuated ring seat 400 be rotated, realize the fundamental function of mechanical seal, and fixing lasso 420 is directly enclosed within rotating ring 300 outer surface, its Placement is simple, convenient, achieve the optimization of structure to greatest extent.
As improvement, the second circular pit 320 is offered in one end that rotating ring 300 is adjacent with rotating seat 400, circular groove 330 is formed between the second circular pit 320 and rotating shaft 100, the dynamic seal ring 331 of twisted rotary shaft 100 is provided with in circular groove 330, rotating ring 300 is against on annular seat board 410, circular groove 330 seals by this annular seat board 410, by installing dynamic seal ring 331, achieve sealing good between rotating ring 300 and rotating shaft 100, under the effect of spring 600, rotating ring 300 is against on the annular seat board 410 of rotating seat 400 all the time, ensure that the normal rotation of rotating ring 300, under the stop of annular seat board 410, dynamic seal ring 331 is avoided to leap up out circular groove 330.
As shown in Figure 1, this device also comprises housing 700, housing 700 and stationary ring 210 are connected by fixed block 710, stationary ring 200 offers the second annular boss 210, second annular boss 210 is provided with static sealing ring 211 and static sealing ring 211 is against on housing 700, the present invention is compared with traditional mechanical seal, eliminate stationary ring 210, directly the housing 700 of stationary ring 210 with pump is fixedly linked, achieve the optimization of structure equally, simultaneously, by offering the second annular boss 210 on stationary ring 210, static sealing ring 211 is arranged on the second annular boss 210, by the connection of stationary ring 210 with housing 700, static sealing ring 211 is pushed down, ensure that sealing good between stationary ring 210 and housing 700.
As improvement, above-mentioned rotating ring 300 adopts hard material to make, hard material is normal pressure-sintered silicon carbide ceramics material, normal pressure-sintered silicon carbide ceramics material forms primarily of following composition (with weight parts): silicon carbide powder: 100 parts, reinforcing fiber: 20-30 part, sintering aid: 3-5 part.
As improvement, above-mentioned stationary ring 200 adopts hard material or soft material to make.When adopting soft material to prepare, soft material is middle hardness carbon graphite material.When adopting hard material to prepare, hard material is normal pressure-sintered silicon carbide ceramics material, normal pressure-sintered silicon carbide ceramics material forms primarily of following composition (with weight parts): silicon carbide powder: 100 parts, reinforcing fiber: 20-30 part, sintering aid: 3-5 part.
Embodiment 1:
When dielectric solid granule content is less than 5wt%, rotating ring adopts hard material to make, and stationary ring adopts soft material to make.
The preparation process of rotating ring is: take the silicon carbide powder 100 parts that particle diameter is 0.1-0.3 μm by weight, the reinforcing fiber that 8 parts of carbon fibers and 12 parts of silicon carbide fibers mix, and the sintering aid 3 parts of B and C composition, wherein B accounts for 10%.First silicon carbide powder is carried out chemical purification, remove silicon and silica.Meanwhile, reinforcing fiber is carried out surface oxidation treatment.Then raw material is mixed, other processing aid can be added by prior art during mixing, obtain slip.Then slip is carried out spraying dry and make 80-100 object particle, then particle is pressed into base substrate, finally under the protection of inert gas argon gas, at 2000 DEG C, carries out high temperature sintering and obtain rotating ring.
During stationary ring adopts, hardness carbon graphite material is made, and the graphite in middle hardness carbon graphite material is before calcination through epoxy resin impregnated process.
Embodiment 2:
When dielectric solid granule content is less than 5%, rotating ring adopts hard material to make, and stationary ring adopts soft material to make.
The preparation process of rotating ring is: take the silicon carbide powder 100 parts that particle diameter is 0.3-0.5 μm by weight, the reinforcing fiber that 10 parts of carbon fibers and 15 parts of silicon carbide fibers mix, and the sintering aid 4 parts of B and C composition, wherein B accounts for 10%.First silicon carbide powder is carried out chemical purification, remove silicon and silica.Meanwhile, reinforcing fiber is carried out surface oxidation treatment.Then raw material is mixed, other processing aid can be added by prior art during mixing, obtain slip.Then slip is carried out spraying dry and make 80-100 object particle, then particle is pressed into base substrate, finally under the protection of inert gas argon gas, at 2200 DEG C, carries out high temperature sintering and obtain rotating ring.
During stationary ring adopts, hardness carbon graphite material is made, and the graphite in middle hardness carbon graphite material is before calcination through epoxy resin impregnated process.
Embodiment 3:
When dielectric solid granule content is less than 5%, rotating ring adopts hard material to make, and stationary ring adopts soft material to make.
The preparation process of rotating ring is: take the silicon carbide powder 100 parts that particle diameter is 0.5-0.8 μm by weight, the reinforcing fiber that 11.2 parts of carbon fibers and 16.8 parts of silicon carbide fibers mix, and the sintering aid 3.5 parts of B and C composition, wherein B accounts for 10%.First silicon carbide powder is carried out chemical purification, remove silicon and silica.Meanwhile, reinforcing fiber is carried out surface oxidation treatment.Then raw material is mixed, other processing aid can be added by prior art during mixing, obtain slip.Then slip is carried out spraying dry and make 80-100 object particle, then particle is pressed into base substrate, finally under the protection of inert gas argon gas, at 2300 DEG C, carries out high temperature sintering and obtain rotating ring.
During stationary ring adopts, hardness carbon graphite material is made, and the graphite in middle hardness carbon graphite material is before calcination through epoxy resin impregnated process.
Embodiment 4:
When dielectric solid granule content is less than 5%, rotating ring adopts hard material to make, and stationary ring adopts soft material to make.
The preparation process of rotating ring is: take the silicon carbide powder 100 parts that particle diameter is 0.8-1 μm by weight, the reinforcing fiber that 12 parts of carbon fibers and 18 parts of silicon carbide fibers mix, and the sintering aid 5 parts of B and C composition, wherein B accounts for 10%.First silicon carbide powder is carried out chemical purification, remove silicon and silica.Meanwhile, reinforcing fiber is carried out surface oxidation treatment.Then raw material is mixed, other processing aid can be added by prior art during mixing, obtain slip.Then slip is carried out spraying dry and make 80-100 object particle, then particle is pressed into base substrate, finally under the protection of inert gas argon gas, at 2500 DEG C, carries out high temperature sintering and obtain rotating ring.
During stationary ring adopts, hardness carbon graphite material is made, and the graphite in middle hardness carbon graphite material is before calcination through epoxy resin impregnated process.
Comparative example 1: rotating ring adopts commercially available common silicon carbide ceramics to make, stationary ring adopts high hardness carbon graphite material to make.
Comparative example 2 is only with the difference of embodiment 2, and the carbon fiber in reinforcing fiber is replaced by equivalent silicon carbide fiber.
Comparative example 3 is only with the difference of embodiment 2, and the silicon carbide fiber in reinforcing fiber is replaced by equivalent carbon fiber.
Comparative example 4 is only with the difference of embodiment 2, and the carbon fiber in reinforcing fiber and silicon carbide fiber are replaced by equivalent glass fibre.
Comparative example 5 is only with the difference of embodiment 2, adds 8 component sintering additives.
Comparative example 6 is only with the difference of embodiment 2, and in sintering aid, B accounts for 20%.
The rotating ring that embodiment 1-4 and comparative example 1-6 is obtained carries out testing property, and test result as shown in Table 1 and Table 2.
The performance test results of the rotating ring that table 1: embodiment of the present invention 1-4 obtains
Table 2: the performance test results of the rotating ring that comparative example 1-6 of the present invention obtains
Contrast from table 1 and table 2, the performance of the rotating ring that the performance of the rotating ring that the constant pressure sintering silicon carbide material after the present invention adopts adjustment of formula is made is made higher than prior art constant pressure sintering silicon carbide material.And, can also draw from comparative example, the reinforcing fiber in constant pressure sintering silicon carbide material of the present invention and the compatibility of sintering aid more reasonable, rigorous, so the final performance obtained is better.
Meanwhile, the rotating ring obtained by embodiment of the present invention 1-4 and comparative example 1-6 and stationary ring are formed a team, and carry out frictional experiment.Draw, under same media and environment, the wear rate of the rotating ring that the embodiment of the present invention obtains and stationary ring is about the 45-55% of the wear rate of rotating ring that comparative example obtains and stationary ring, in the larger working life that improve rotating ring of the present invention and stationary ring, reduces maintenance cost.
The difference of embodiment 5-8 and embodiment 1-4 is only, when dielectric solid granule content be greater than 5wt% or very easily vaporize, crystallization time, rotating ring and stationary ring all adopt hard material to make.
Comparative example 7 is only with the difference of embodiment 6, and during stationary ring still adopts, hardness carbon graphite material is made, and the graphite in middle hardness carbon graphite material is before calcination through epoxy resin impregnated process.
Comparative example 8 is only with the difference of embodiment 6, and rotating ring all adopts commercially available common silicon carbide ceramics to make.
Embodiment 5-8 and comparative example 7 and the obtained rotating ring of comparative example 8 and stationary ring are formed a team under solid content is greater than the medium of 5wt%, and carries out frictional experiment.Draw, under same media and environment, the wear rate of the rotating ring that the embodiment of the present invention obtains and stationary ring is about the 10-15% of the wear rate of the obtained rotating ring of comparative example 7 and stationary ring, be about the 40-45% of the wear rate of the obtained rotating ring of comparative example 8 and stationary ring, in the working life that improve rotating ring of the present invention and stationary ring larger equally, reduce maintenance cost.
The difference of embodiment 9-12 and embodiment 1-4 is only that graphite in middle hardness carbon graphite material is before calcination through furan immersion treatment.
The difference of embodiment 13-16 and embodiment 1-4 is only that graphite in middle hardness carbon graphite material is before calcination through resin impregnating process.
The difference of embodiment 17-20 and embodiment 1-4 is only that graphite in middle hardness carbon graphite material is before calcination through the process of Babbitt solution impregnation.
The difference of embodiment 21-24 and embodiment 1-4 is only that graphite in middle hardness carbon graphite material is before calcination through aluminium alloy solution immersion treatment.
The difference of embodiment 25-28 and embodiment 1-4 is only that graphite in middle hardness carbon graphite material is before calcination through copper alloy solution immersion treatment.
The difference of embodiment 29-32 and embodiment 1-4 is only that graphite in middle hardness carbon graphite material is before calcination through the process of antimony alloy solution impregnation.
The difference of embodiment 33-36 and embodiment 1-4 is only that graphite in middle hardness carbon graphite material is before calcination through the process of silver alloy solution impregnation.
The difference of embodiment 37-40 and embodiment 1-4 is only that graphite in middle hardness carbon graphite material is before calcination through glass solution immersion treatment.
The difference of embodiment 41-80 and embodiment 1-40 is only that the carbon fiber in reinforcing fiber is replaced by equivalent glass fibre.
The difference of embodiment 81-160 and embodiment 1-80 is only that silicon carbide fiber accounts for 50% of blend fiber.
The difference of embodiment 161-240 and embodiment 1-80 is only that silicon carbide fiber accounts for 55% of blend fiber.
The difference of embodiment 241-320 and embodiment 1-80 is only that silicon carbide fiber accounts for 58% of blend fiber.
The difference of embodiment 321-400 and embodiment 1-80 is only that in sintering aid, B accounts for 8%.
The difference of embodiment 401-480 and embodiment 1-80 is only that in sintering aid, B accounts for 12%.
The difference of embodiment 481-560 and embodiment 1-80 is only that in sintering aid, B accounts for 15%.
The difference of embodiment 561-640 and embodiment 1-80 is only that sintering aid is B.
The difference of embodiment 641-720 and embodiment 1-80 is only that sintering aid is C.
In view of the present invention program embodiment is numerous, each embodiment's laboratory data is huge numerous, be not suitable for particularize explanation herein, but the content of the required checking of each embodiment is all close with the final conclusion obtained, so do not illustrate one by one the checking content of each embodiment, only with embodiment 1-8, the excellent part of the present patent application is representatively described herein.
The non-limit part of technical scope midrange that this place embodiment protects application claims, equally all in the scope of protection of present invention.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (10)
1. a mechanical sealing device used for pump, comprise rotating shaft, it is characterized in that, rotating shaft is provided with stationary ring and rotating ring, described rotating ring one end is against on stationary ring, rotating shaft is also provided with rotating seat and transmission circle, described transmission circle and rotating shaft are connected, described rotating seat front end is connected with rotating ring, rear end offers the first circular pit, its outer surface is provided with spring in described rotating shaft and spring is positioned at the first annular concave platform hole, described spring one end is against on the first circular pit, the other end is against on transmission circle, axially tightening plate is provided with in transmission circle side, described tightening plate is against on rotating seat, tightening plate is provided with Cock screw, described Cock screw runs through tightening plate and transmission circle and is against in rotating shaft.
2. a kind of mechanical sealing device used for pump according to claim 1, is characterized in that, described rotating ring adopts hard material to make, and described stationary ring adopts hard material or soft material to make; Described hard material is normal pressure-sintered silicon carbide ceramics material, and described soft material is carbon graphite material.
3. a kind of mechanical sealing device used for pump according to claim 2, it is characterized in that, described normal pressure-sintered silicon carbide ceramics material forms primarily of following composition (with weight parts): silicon carbide powder: 100 parts, reinforcing fiber: 20-30 part, sintering aid: 3-5 part.
4. a kind of mechanical sealing device used for pump according to claim 3, it is characterized in that, described reinforcing fiber is the blend fiber of the arbitrary and composition of silicon carbide fiber in carbon fiber and glass fibre, and described silicon carbide fiber accounts for the 50-60% of blend fiber gross mass.
5. a kind of mechanical sealing device used for pump according to claim 3, is characterized in that, described sintering aid is one or both in B, C.
6. a kind of mechanical sealing device used for pump according to claim 2, is characterized in that, described carbon graphite material is middle hardness carbon graphite material.
7. a kind of mechanical sealing device used for pump according to claim 3, is characterized in that, preparation process when described rotating ring and stationary ring adopt normal pressure-sintered silicon carbide ceramics material to prepare mainly comprises the following steps:
S1, undertaken preparing burden and being mixed to get slip by the constituent of thyrite described in claim 3 and parts by weight thereof;
S2, above-mentioned slip is carried out spraying dry make particle, then particle is pressed into base substrate, under inert gas shielding, at 2000-2500 DEG C, finally carries out high temperature sintering obtain rotating ring or stationary ring.
8. a kind of mechanical sealing device used for pump according to claim 1, it is characterized in that, described rotating seat comprises the annular seat board vertical with rotating shaft and the fixing lasso with shaft parallel, rotating ring is provided with the first annular boss, described rotating ring is against on annular seat board, and described fixing lasso and rotating ring outer surface are adjacent to and fixing lasso is against on the first annular boss.
9. a kind of mechanical sealing device used for pump according to claim 1, it is characterized in that, described one end adjacent with rotating seat at rotating ring offers the second circular pit, is formed with circular groove, is provided with the dynamic seal ring of twisted rotary shaft in circular groove between the second circular pit and rotating shaft.
10. a kind of mechanical sealing device used for pump according to claim 1, it is characterized in that, described device also comprises housing, and described housing and stationary ring are connected, stationary ring offers the second annular boss, the second annular boss is provided with static sealing ring and static sealing ring is against on housing.
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| CN201510336370.7A CN104989827A (en) | 2015-06-17 | 2015-06-17 | Mechanical sealing device for pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510336370.7A CN104989827A (en) | 2015-06-17 | 2015-06-17 | Mechanical sealing device for pump |
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| CN104989827A true CN104989827A (en) | 2015-10-21 |
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| CN201510336370.7A Pending CN104989827A (en) | 2015-06-17 | 2015-06-17 | Mechanical sealing device for pump |
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| CN108815981A (en) * | 2018-08-30 | 2018-11-16 | 大连惠川环保科技有限公司 | A kind of elevated-temperature seal distributing device |
| CN108869382A (en) * | 2018-06-13 | 2018-11-23 | 大连理工大学 | A kind of secondary sealing structure of the core main pump mechanical seal of wear resistant friction reducing radiation aging resistant |
| CN108869748A (en) * | 2018-07-13 | 2018-11-23 | 侯玉琼 | A kind of sealing element |
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Application publication date: 20151021 |