關(guān)于影響泵機械密封的外部條件的研究外文文獻翻譯、中英文翻譯

1、IIThe external condition research of affecting pumps using machinery sealAbstract: Through to pumps with the mechanical seal practical application and the theoretical analysis, proposed the mechanical seal actual seal effect not only with the mechanical seal own performance related, the condition wh

2、ich with other spare parts also which provides the condition as well as the seal servosystem provides to have the important relations, therefore pumps the unit product when the design, must for the mechanical seal use provide a good external condition.Key words: Pumps Mechanical seal MeasuresAt pres

3、ent the mechanical seal in pumps in a kind of product the application extremely widespread, but and will save the energy along with the product technical level enhancement the request, the mechanical seal application prospect is more widespread. The mechanical seal seal effect directly will affect t

4、he entire machine movement, in particular in petroleum chemical industry domain, because will exist flammable, explosive, is easy to volatilize, to be violently poisonous and so on the medium. The mechanical seal appears will divulge, seriously will affect the production normally to carry on, is ser

5、ious also appears the significant security accident. People when analysis quality breakdown reason, often is familiar with in the mechanical seal own aspect searches the reason, for example: Mechanical seal shaping whether appropriate, choice of material whether correct, the packing surface compared

6、 to presses whether correctly, rubs the vice- choice is whether reasonable and so on. But is short very much in the mechanical seal external condition aspect searches the reason, for example: Pumps for the mechanical seal creation condition whether appropriate, the servosystem disposition is whether

7、 appropriate, but these aspects reasons often are count for much. This article author from pumped has analyzed the reasonable measure with the mechanical seal external condition angle which the influence seal effect several kind of factors and should adopt.1 Principle and request that machinery seal

8、s off: The mechanical seal is depends on a pair of relative motion link end surface A (fixed, another revolves together with axis) the mutual fitting forms the small axial play plays the seal role, this kind of equipment is called the mechanical seal. The mechanical seal usually by moves the link, t

9、he static link, contracts the part and the seal part is composed. Moves the link and the static link end surface composes a pair to rub, moves the link to depend on in the sealed chamber the liquid pressure to cause its shoulder up on the static link end surface, and produces on two links end surfac

10、es suitable compared to presses and maintains an extremely thin liquid membrane to achieve the seal the goal. Contracts the part pressurize, may cause to pump under the operating condition, also maintains the end surface fitting, guaranteed the seal medium nothing more than leaks, and prevented the

11、impurity enters seals the end surface. Seals the part to play the seal to move the link and axis gap B, the static link and the gland gap C role, simultaneously to the vibration which pumps, attacks the cushioning effect. The mechanical seal in the actual movement is not an isolated part, it is with

12、 other spare parts which pumps combines the movement together, simultaneously may see through its basic principle, the mechanical seal normal operation has the condition, for instance: Otherwise fleeing measures a pump spindles being not able to very big, friction subsidiary end face can not form th

13、e ratio pressure demanding regularly; The pump spindle that machinery hermetic sealing gets along can not have boundary very big deflection , end face waits a minute otherwise than pressure will be uneven. Besides only when satisfying similar such external condition, fine machinery seals off oneself

14、 function, ability reaches ideal hermetic sealing effect.2 Analysis of causes that external condition affects:2.1 Pump spindle axial to fleeing is measured big:The hermetic sealing that machinery seals off needs to have certain ratio pressure face to face, such ability plays arrive at hermetic seali

15、ng role, be requiring that spring that machinery seals off needs to have certain compression amounts right now, give a propulsive force sealing off end face, rotating makes hermetic sealing produce the pressure sealing off the what be demanded ratio face to face. For ensuring that this one is compar

16、ed to pressure, the amounts machinery is sealed off requiring that the pump spindle can not have very big fleeing, need to ensure that within 0.5 mm in general. Design but middle in reality, unreasonable because of design, that sometimes, very big fleeing of pump spindle creation measure , seal off

17、to machinery sigmatism is very disadvantageous. This phenomenon sometimes appears in multi-level centrifugal pump, Especially in the process of pump starting, flee amounts are comparatively big.The automation changes the b balancing a set and balancing the axial gap between the ring when balance pla

18、te works , changes the difference balancing the pressure checking front and back two flanks thereby , produces one and comes to balance the axial force axial contrary force direction acting force. The inertia effect moving since the rotator flees and transient pump working condition fluctuation, the

19、 rotator moving round will not be motionless in some one axial balance location.Balance the state fleeing all the time in retinue to move. But the amounts balancing axial to fleeing in checking in regular job only have 0105 011 mm , satisfy permission axial to fleeing that machinery seals off measur

20、ing 015 mm requests, allowable machinery hermetic sealing axial to fleeing balancing axial to fleeing to measure possibility getting it in gear, when stopping machine , working condition great change in pump making rings round expects that.After pumps passes through the long time movement, the frict

21、ion balancing a set and balancing a ring wears away , gap b enhances subsequently, the amounts sealing off axial to fleeing increase machinery unceasingly. Effect because of axial force, hermetic sealing compacting soft and floury sucking oblique tones in increases by strenuously , hermetic sealing

22、wears the effect aggravating , sealing up completely until hermetic sealing damages , loses face to face away face to face.The machinery spitting out oblique tones is sealed off , is wear away with balancing plates, rotator component axial to fleeing measures the amounts sealing off axial to fleeing

23、 demanding greater than , the force sealing off compacting soft and floury is diminished , cannot reach the effect sealing off a request , making the machinery hermetic sealing on both side of the pump all ultimately losing hermetic sealing.2.2 The axial force is prejudiced big:Machinery hermetic se

24、aling can bear the axial forces in the process of usage, if the effect that existence seals off axial the force , to machinery is grave. Since pump axial the aspect cause such as rational and making , assembling , being put into use that dynamic balance organization designs, brings about the axial f

25、orce be not balanced away sometimes.Machinery hermetic sealing bears a axial force , the seal gland temperature will be partial to height when moving round, to the medium that polypropylene is similar to, before the high temperature be able to be molten down, the pump starts the queen therefore losi

26、ng hermetic sealing effect very quickly right away , discontinuous gushing sealing off end face then appearing leaves out phenomenon when the pump is motionless.2.3 pump spindles deflections are slanting big:That machinery hermetic sealing calls end face hermetic sealing, is that one kind of axis of

27、 rotation to contact-type moves hermetic sealing , it is under fluid medium and elasticity component effect , two perpendicularities reach hermetic sealing effect thereby in stick the small side door , relative rapid and intense axle centre line hermetic sealing end face revolution, demands to need

28、to accept a force homogeneously between two hermetic sealing therefore.The machinery spitting out oblique tones is sealed off , is wear away with balancing plates, rotator component axial to fleeing measures the amounts sealing off axial to fleeing demanding greater than , the force sealing off comp

29、acting soft and floury is diminished , cannot reach the effect sealing off a request , making the machinery hermetic sealing on both side of the pump all ultimately losing hermetic sealing.2.4 not assisting irrigation system or assists irrigation system to interpose block of wood reasonableness: Tha

30、t assisting that machinery seals off washes system is very important , it can protect effects such as sealing off face , getting to the cooling , lubrication , washing away varia effectively. Design that allocation assists irrigation system, to be unable to reach hermetic sealing effect not rational

31、ly sometimes;Have foreign substance sometimes although designing that the personnel has designed auxiliary system, since in washing liquid, rate of flow , pressure washing liquid are insufficient , wash mouth location designing that wait for cause unreasonable , also same being unable to reach herme

32、tic sealing effect.2.5 vibration is slanting big:Machinery seals off vibration insisting to lead to big , ultimate losing hermetic sealing effect. That machinery seals off big slanting vibration cause sometimes is not that machinery seals off self cause but , other pump component and part is to prod

33、uce the origin vibrating , waits for cause if the pump spindle designs that cause , axle bearing accuracy unreasonable , processing are insufficient , shaft coupling degree difference , radial force of equal rank are big.2.6 Cause that the pump vapor erodes:The function is not good , the pump rotati

34、on rate is partial to height since device system operation is unreasonable and the pump entrance vapor erodes, that the vapor erodes , the vapor erodes the entry occurrence part in the pump the day afer tomorrow happened , is able to have air bubble in the water, that it may pound machinery on one h

35、and seals off the outside surface soft and floury , makes its surface damage appear on; That another aspect may make fitting that astiring sound is encircled by also contain air bubble in flow soft and floury film, can not form the stable flow film , brings about the trunk friction that fitting that

36、 astiring sound is encircled by face , makes machinery seal damage.2.7 Machine work accuracy is insufficient:Machine work accuracy is insufficient , cause has many, the treating accuracy having plenty of machinery sealing self off is insufficient , this aspect cause finds also easy to pay attention

37、to easy to arouse people. But the sometimes is a pump other component treating accuracy lack , this aspect cause, do not pay attention to easy to arouse people. For instance: Cause such as pump spindle , axle sleeve , the pump body , the accuracy lack sealing off enlarging of the cavity body. The he

38、rmetic sealing effect that these cause existence seals off to machinery is very disadvantageous.3 responds to the measure adopting:3.1Remove a pump spindle fleeing to measure big measure:Amounts designing that axial force balance is equipped with , removes axial to fleeing rationally. For satisfying

39、 this one request,have two to the multi-level centrifugal pump , the comparatively ideal design plan: One is that balance plate adds axial to stopping push axle bearing , balance the axial force from balance plate , carry out axial on the pump spindle from axial to stopping pushing axle bearing posi

40、tion-limit; Another is that the balance drum adds axial to stopping push axle bearing, axial force balancing away major part from the balance drum, axial surplus force bears from stopping pushing axle bearing , axial to stopping pushing axle bearing carries out axial on the pump spindle at the same

41、time position-limit. Second kinds schemes key is to design the balance drum rationally, makes that be able to balance away the most axial force really. Wait for a product to opening a pump in other single stage pump,within amounts range sealing off range demanded by in machinery designing fleeing ad

42、opting a few measure guarantee pump spindles now and then.3.2 Remove big axial strenuously prejudiced measure:The organization designing axial dynamic balance rationally, makes that be able to balance away the axial force really sufficiently , being sealed up completely by machinery creates a favora

43、ble condition. Must achieve testing detecting and discovering problem and solve a problem before the product , unfinished products leave the factory to importance that fields such as a little electric power plant , petrochemical industry, applies. Some important pumps can design a axial to measuring

44、 the force ring on the rotator , monitor at any time to being on the march toward the force size scroll, discover a problem in time solve.3.3 Remove big prejudiced pump spindle deflection measure:Existence is in this phenomenon mostly in multi-level centrifugal pump of horizontal type, adopting the

45、following measure time design: (1) cuts down both ends distance between axle bearing. The pump impeller progression is not very more than , under the general pump lift request is comparatively good situation, try ones best to improve every level impeller lift, cuts down progression;(2) increases the

46、 pump spindle diameter. During the period of the diameter designing a pump spindle, consider the size transferring power simplely only, do not but want the inertia factors such as load , radial force thinking that machinery seals off ,the axis deflection, starts method and being connected with. Much

47、 one point designing that not sufficient cognition arrives at this; (3) improves pump spindle material grade; (4) pump spindles are designed after being completed, the deflection to the pump spindle asks the checkout carrying out the core of school to secretly scheme against.3.4 Increases by assisti

48、ng irrigation system: Under the situation that condition allows, system designing auxiliary irrigation to the full. Wash pressure general requirements overtoping 0107 011 MPa sealing off cavity pressure, if transportation medium belongs to easy vaporization, respond to 01175 012 MPa higher than vapo

49、rization pressure then. The pressure sealing off a cavity is going to secretly scheme against according to every kind of pump structure during the past factors such as pattern , system pressure.Or when shaft seal accent pressure is very high when pressure uses almost approximation should seal up com

50、pletely the maximal limit, fever of also may make shaft seal liquid be on the move from the area sealing off a cavity attracting liquid till low pressure, to take away friction. If the irrigation amounts being recommended by administering medicine to bring out the cold be what 1 shows.According to e

51、ach kind of pump operation condition,deploy the pipeline and accessories rationally. If the chiller , pore plate , filter , valve , rate of flow indicator , piezometer , the temperature wait. Reliability and life-span sealing up completely in fact, depend on the allocation sealing off auxiliary syst

52、ems to a great extent.3.5 Remove the measure that the pump entrance vapor erodes:(1) The vapor eclipse function raising a pump is horizontal , the vapor satisfying the scene device erodes the function request;(2) Scene tester request needs and the pump vapor erodes function level matching;(3) That s

53、cene installation and working condition adjustment need to give a pump creates advantageous condition.3.6 Remove the measure that the pump shakes:(1) The product is hit by a pump in designing process , is is going to analyse the source vibrating sufficiently, to eliminate shaking a source. ;(2) Pump

54、 product fabrication assembles process middle , directive rules goes and carrying out , eliminates shaking a source strictly according to the standard and operation;(3) Pump , electric motor , assist equipment to be going to guard the pass , eliminate strictly to shake a source during the period of

55、scene installation such as base , scene pipeline,;(4) Guard the pass , eliminate when producing , handling , keeping a scene in repair , adjusting, strictly to shake a source.3.7 Execute to the letter design criterion:The design sealing off a products asks pump product design and machinery to carry

56、out the pertinent home and abroad standard , design that should carry out a standard carefully in the process of the product design,among deep every strip content concrete significance understanding a standard , the process the standard content request implementation is designed to the product.By no

57、w, actual import having many standards designing that not understand that , go and carrying out the new standard, not but being to copy the experience designing according to the set of old drawing sheet and old people blind strictly. That this resorts to magic arts to improving our country product e

58、ngineering level and entering international market is very disadvantageous. Improve the standardizing cognition , be that machinery industry designs that need the problem solving urgently at present.4 Concluding remark: Pumps when the design with the mechanical seal, not only must consider the mecha

59、nical seal itself influence factor, moreover must consider exterior the mechanical seal each kind of influence factor. Must pay attention to following several questions in the practical work:(1) in pumps the product in the design process to have fully to consider pumps other spare parts as well as the scene other equipment to the mechanical seal use effect influence, creates a good external condition for the mechanical seal;(2) increases to the mecha