By what is system of lubricant of centrifugal type compressor comprised partly? What does the characteristic of centrifugal type compressor have? What is the working principle of centrifugal type compressor?
1, by what is system of lubricant of centrifugal type compressor comprised partly?
Lubricant system is in charge of line and control valve and composition of measuring instrument place by lube station, exalted gasoline tank, intermediate join.
Lube stands to be comprised by all sorts of control valve of gasoline tank, oil pump, oily condenser, oil purifier, pressure, measuring instrument and vitta road and valve.
2, what is the action of exalted gasoline tank?
Exalted gasoline tank is one of aircrew safety safeguard, when aircrew moves normally, lube is entered from bottom, and from coping eduction direct oil sump tank, once produce power cut to stop machine accident, oil of auxiliary oil pump cannot be started in time for oil, the oil sump tank after the lube of exalted gasoline tank will flow to be nodded via lubricating individually along line of oil inlet pipe, ensure the indolent of aircrew takes the process need to lube.
3, what does the characteristic of centrifugal type compressor have?
Centrifugal type compressor is a kind of turbine type compressor, have processing gas to measure big, volume small, structure is simple, movement is smooth, maintenance is convenient and gas does not get oily pollution, adoptable drive form is more wait for a characteristic.
4, the working principle of centrifugal type compressor?
Generally speaking, the main goal that increases aeriform pressure increases the amount of element of the gas inside unit volume namely, shorten namely the distance between aeriform element and element, to achieve this one goal, use the method of the aerodynamics, use machine namely do work component (impeller of high speed revolving) , do work to gas, make gas gets rising in the pressure below the action of centrifugal type, at the same time kinetic energy also increases greatly, inside enlarge pressing flow path subsequently this part kinetic energy transforms again for static pressure can, and make aeriform pressure increases further, this is the working principle of centrifugal type compressor.
5, what does the prime mover with centrifugal type common compressor have?
The prime mover with centrifugal type common compressor has: Electromotor, turbine, light turbine to wait.
6, what does the subsidiary engine equipment of centrifugal type compressor have?
Of lead plane of centrifugal type compressor moving is the premise of normal motion act with subsidiary engine equipment, subsidiary engine includes the following fields:
(1) lubricant system.
(2) cooling system.
(3) condensate system.
(4) electric meter system controls a system namely.
(5) dry gas sealed system.
7, which a few sort does centrifugal type compressor divide by structural characteristic model?
Centrifugal type compressor can divide by structural characteristic for: Type of type of horizontal analyse cent, perpendicular analyse cent, isotherm reduces the kind such as type, combined-type.
8, by what is rotor comprised partly?
Rotor includes nut of main shaft, impeller, axle sleeve, axis, lie between set, evenly dish with thrust dish.
9, the asthma that what is centrifugal type compressor brace up?
Centrifugal type compressor is in manufacturing moving process, can produce intense vibration suddenly sometimes, the discharge of aeriform medium and pressure also appear substantially pulsatile, accompany have periodic tone of depressed “ call ” , and the strong noise that air current wave motion causes ” of puff and blow of ”“ of “ puff and blow in managing a network, the asthma that this kind of phenomenon calls centrifugal type compressor brace up operating mode. Compressor cannot be in asthma brace up operating mode falls to move for long, once compressor enters asthma brace up operating mode, operation personnel should be adopted instantly adjust measure, reduce outlet pressure, or increase an import, or exit discharge, make compressor breaks away from asthma quickly brace up area, the stability that realizes compressor moves.
10, breathe heavily brace up what is phenomenal feature?
Centrifugal type compresses accident to once appear,breathe heavily all right brace up phenomenon, criterion aircrew moves with what manage a network have the following feature:
(1) the outlet pressure of aeriform medium and entrance discharge change substantially, produce gas possibly still to flow backwards sometimes phenomenon. Aeriform medium turns to enter the mouth for flow direction by compressor eduction, this is dangerous operating mode.
(2) tubal net has periodic vibration, amplitude is big, frequency is low, accompany periodic “ roars ” sound.
(3) compressor airframe vibration is intense, housing, bearing all has intense vibration, give out strong periodic air current voice, because vibration is intense, bearing is lubricant the condition can be destroyed, plain bearing liner will be burned-out, even axis by twist off, rotor and stator can produce clash, collide, sealed component will be played havoc with.
11, how to undertake preventing breathing heavily brace up adjust?
Breathe heavily brace up the harm is great, but cannot give from the design up to now eliminate, can try to avoid unit motion to enter asthma all right in movement only brace up operating mode, prevent asthma brace up the principle is aimed at namely cause asthma brace up reason, in asthma brace up when will happening, try to increase the flow of compressor instantly, make aircrew moves break away from asthma brace up area. Prevent asthma brace up the means is specific have 3 kinds:
(1) partial gas puts empty way.
(2) law of partial gas circumfluence.
(3) change compressor runs rotate speed way.
12, what is the account that compressor entrance takes fluid?
(1) before the craft gas temperature that the system carries is high, aeriform unfinished is complete by condensation, gas carries conduit to grow too, the course contains a liquid in the gas after conduit condensation.
(2) machining complex temperature is high, the constituent with the inferior boiling point in aeriform medium is become by condensation liquid.
(3) segregator fluid exorbitant, generation enrages fluid carry secretly.
13, does compressor move under asthma brace up ultimate reason?
(1) exit back pressure is too high.
(2) valve of inlet tube line by reduce expenditure.
(3) exit cop valve by reduce expenditure.
(4) prevent asthma brace up valve has blemish to perhaps adjust incorrect.
14, does the operating mode of centrifugal type compressor adjust what does the method have?
Because produce parameter of art of go to work to be able to have change inevitably, often need to be opposite so compressor undertakes the hand is moved or self-adjusting, make compressor can get used to production to ask changing the operation below operating mode, in order to maintain the stability of manufacturing system.
The adjustment of centrifugal type compressor has two kinds commonly: It is to wait pressure adjust, move section discharge below the premise with constant back pressure namely; Another kind is to wait for discharge adjustment, the exhaust pressure that reduces section compressor in the circumstance that makes sure flow is constant namely, specific say to have the following 5 kinds adjust means:
(1) export discharge adjustment.
(2) import discharge adjustment.
(3) change rotate speed adjustment.
(4) roll imports guide vane adjustment.
(5) the part puts sky or circumfluence to adjust.
15, what is waiting for the pressure adjustment, meaning that waits for discharge adjustment and scale to adjust?
(1) waiting for pressure adjustment is to show the exhaust pressure that maintains compressor is constant, change the adjustment of aeriform discharge only.
(2) waiting for discharge adjustment is to show the flow that maintains compressor to carry aeriform medium is constant, just change the adjustment of discharge pressure.
(3) scale adjustment is to point to maintain pressure to compare changeless (if prevent asthma brace up adjust) , or the adjustment with the cubage discharge fixed percentage that holds medium of two kinds of gas.
16, what is tubal net? What is its compositive element?
Managing a network is the pipeline system that centrifugal type compressor implements aeriform medium to carry the mission, before be located in compressor to enter the mouth call inspiratory conduit, after be located in compressor to export call eduction conduit, inspiratory call tubal network normally for one whole pipeline system with eduction conduit the sum.
Be in charge of a net to all wait for 4 element composition by cop, pipe fitting, valve and equipment commonly.
17, what is the harm of axial force?
The rotor that high speed runs. From beginning to end action is worn the axial force that points to low-pressure end by high-pressured end. Rotor falls in the action of axial force, produce the way of edge axial force axial displacement, the axial displacement of rotor, what will make the generation between journal and plain bearing liner opposite is slip. Accordingly, pull journal or plain bearing liner likely, more serious is, as a result of rotor displacement, will cause rotor component and attrition of stator component generation, collision and even mechanical damage, as a result of the axial force of rotor, have cause works attrition, wear away, collision and even the harm that destroy a machine, so, should adopt significant step to give evenly, in order to raise the moving dependability of aircrew.
18, what balance method does axial force have?
The balance of axial force is the odd issue that terminal consideration needs when centrifugal type compressor designs multistage, current, adopt below in order to two kinds of methods more commonly:
(1) impeller contraposition is arranged (side of impeller high pressure and back of low-pressure side back are arranged)
The axial power that only course impeller produces, its direction points to impeller entrance, point to low-pressure side by high-pressured side namely, if multistage impeller presses sequential method to arrange, criterion total axial force is rotor the sum of force of various impeller axial, such apparent permutation can make rotor axial power very great. If multistage impeller uses contraposition to arrange, enter the mouth contrary impeller, produce the axial power with an opposite way, can get a balance each other, because this contraposition is arranged,be multistage the axial equilibrium method with centrifugal type the most commonly used compressor.
(2) the setting is balanced dish
Evenly dish it is multistage the axial equilibrium device with centrifugal type commonly used compressor, evenly dish install more commonly at high-pressured side, outside set between predestined relationship and cylinder labyrinthian and sealed, make high-pressured side and side of low pressure of compressor entrance connective keep certain thereby press difference, this pressing needs the axial power of generation, its direction and the axial power that impeller produces are contrary, because this balances the axial force because of impeller generation.
19, what is the purpose of rotor axial equilibrium?
The purpose that rotor balances, basically be to reduce axial thrust, reduce stop the negative charge that shifts bearing, usually the 70 ℅ of axial force are to carry a balance dish eliminate, the rest 30 ℅ are to have stop shift bearing responsibility, production carries out a proof, retain certain axial power, it is the significant step that raises rotor to move smoothly.
20, what is the reason that thrust covers with tiles temperature lifts?
(1) structural design is unreasonable, thrust tile bears the weight of the area is small, unit area bears bear exceeds bid.
(2) between class sealed invalidation, impeller of the one class after making utters before aeriform leak comes one step, increase impeller of two side press difference, formed bigger thrust.
(3) balance canal is blocked up, balance dish of deputy pressure that control speech cannot discharge is dropped, balance dish of action to cannot be developed normally.
(4) balance dish of sealed invalidation, working antrum pressure is irretentive normal, balance ability drops, drop partial load is passed to thrust tile to cause thrust to cover with tiles excess load moves.
(5) thrust bearing enters aperture of oily reduce expenditure small, cooling oily discharge is insufficient, the quantity of heat that attrition produces cannot be taken entirely.
(6) water is carried in lube or contain other foreign matter, thrust tile cannot form complete liquid to lubricate.
(7) bearing takes oily temperature exorbitant, environment of thrust made of baked clay work is undesirable.
21, if why handle thrust is made of baked clay temperature exorbitant?
(1) intensity of pressure of made of baked clay press press of school nucleus thrust, enlarge thrust tile to bear the weight of appropriately area, make thrust bears load is inside standard limits.
(2) between disintegrate examination class sealed, change between the class of attaint sealed spare parts.
(3) the examination balances a canal, eliminate jam content, counterbalance dish can seasonable discharge drops pair of pressure that controls speech, assure to balance dish of play that balances ability.
(4) change balance dish of sealing strip, improve a balance dish sealed function, poise the pressure of dish of job antrum, make axial thrust gets reasonable balance.
(5) the aperture that enlarges bearing to enter oily knothole, increase lube amount, the quantity of heat that makes attrition arises can be taken in time.
(6) change new eligible lubricating oil, hold the lubricant property of lube.
(7) leave to greatly condenser takes backwater a powerful person, increase cooling water amount, drop the temperature that offer oil.
22, if why handle compressor does if why handle compressor,the entrance take fluid?
(1) the system before connection, adjust technology operation.
(2) this system raises segregator to discharge fluid frequency appropriately.
(3) reduce segregator fluid height, prevent to enrage fluid carry secretly.
23, what does the reason that turbine drives compressor unit performance to drop have?
(1) between compressor class sealed and serious damage, sealed function is reduced, circumfluence of aeriform medium interior increases.
(2) impeller wears away serious, rotor function drops, aeriform medium cannot get enough kinetic energy.
(3) turbine vapour screen pack jams, vapour is current suffocate suffocate, flow is little, press difference big, affect the output power of turbine, reduced unit performance.
(4) vacuum is spent ask under index, turbine exhaust suffocate suffocate.
(5) parameter of vapour temperature, pressure under operation index, vapour internal energy is low, cannot satisfy aircrew to produce service requirement.
(6) produce asthma brace up operating mode.
24, what main performance data does centrifugal type compressor have?
The main performance data of centrifugal type compressor has: Discharge, outlet pressure or compression ratio, power, efficiency, rotate speed.
The main performance data of equipment is the basic data of the respect such as environment of capacity of characteristic of token facility construction, job, work, it is the equipment of user choose and buy, important directiveness material that makes a program.
25, what is the meaning of efficiency?
Efficiency is token centrifugal type compressor passes those who enrage body energy to use rate, use rate taller, the efficiency of compressor is taller.
Because gas is compressed,much transformation shrinks, heat insulation is compressed and isotherm reduces 3 kinds of processes, accordingly, the efficiency of compressor also is divided for changeful efficiency, adiabatic efficiency and isothermal efficiency.
26, what is the meaning of compression ratio?
The compression ratio that we say shows compressor discharges those who give aeriform pressure and inlet pressure to compare namely, also weigh pressure comparing or pressure ratio sometimes so.
27, sealed action?
Centrifugal type compressor wants to achieve favorable moving result, certain clearance must be withheld between rotor and stator, the attrition with avoiding meantime, wear away and the happening of the accident such as collision, attaint. At the same time the existence as a result of clearance, natural meeting causes the leak appearance that carries with the axis between class, leak reduced the work efficiency of compressor not only, and caused environmental pollution, produce explosive accident even. Because this leak is seemed now,cannot allow generation. Sealed below the case that there is suitable space between reservation rotor and stator namely, avoid the leak between compressor class and the significant step that the axis carries leak.
28, which a few kinds is seal unit by structural characteristic cent? What is choosing a principle?
According to the job of compressor gentle style medium has temperature, pressure to wait for a condition without the harm, sealed use different configuration, appellative it is seal unit.