Principle of work of screw pneumatics engine reachs each systematic work principles to analyse.

One, lead plane / electric machinery system:

Machine of odd screw pneumatics calls worm pneumatics machine again, the clench the teeth of machine of odd screw pneumatics deputy by a 6 head screw and the star of 2 11 tine annulus form. Worm at the same time with clench the teeth of two astral annulus although worm suffers equilibrium, make discharge a quantity to increase one times again. The screw type compressor that we say normally points to compressor of double screw type commonly.

Odd screw

Double screw

Screw type (namely double screw) compressor is had a pair of mutual clench the teeth, contrary come back to the rotor of gyroidal tine. The rotor with its raised tooth flank calls in relief rotor, tooth flank is sunken the rotor below calls shade rotor. Be in as rotor the whirligig inside airframe, make work because cubage ages invade or come away and produce change ceaselessly, change rotor periodicly thereby every are right alveolar the cubage between, will achieve inspiratory, reduce the goal with exhaust.

Lead plane is the core component of screw machine, the screw machine of any brands structure of its lead plane and working mechanism are close.

(1) inspiratory process

When rotor rotates, a when a tine of in relief rotor breaks away from shade rotor continuously alveolar, the cubage between tine expands gradually, connect with inspiratory orifice, gas takes the dimension between tine via inspiratory orifice, when reaching maximum till the cubage between tine, disconnect with inspiratory orifice, by tine and inner casing body joint action closes the cubage between tine, inspiratory process ends. Notable is, right now in relief rotor is mixed the cubage between the tine of shade rotor each other do not connect.

(2)Reduce a process

Rotor continues to rotate, before the cubage between tine of shade, in relief rotor connects, the gas in the cubage between tine of in relief rotor, suffer what shade rotor ages to invade go ahead of the rest to compress; After classics some corner, the cubage between tine of shade, in relief rotor connects, form ” V ” the cubage between the tine of the glyph is right (base yuan cubage) , along with the mutual impact that two rotor age, base yuan cubage by gradually elapse, cubage also narrows gradually, the compression that realizes gas process. Reduce a process until base yuan when cubage and photograph of steam vent mouth connect till.

(3) exhaust process

Because rotor rotates time base yuan cubage is ceaseless and contractible, send vent-pipe the gas after compressing, this process continues to this cubage all the time most till the hour.

Rotate as rotor continuously, afore-mentioned inspiratory, compress, exhaust process undertakes circularly, each base yuan cubage is ordinal work in succession, the work that made compressor of screw type refrigeration circulates.

The analysis from above process is knowable, two rotor turn to a side that caters to each other, namely protruding ages with sunken tine each other cater to built-in a side, aeriform press press shrinks and form higher pressure, call high-pressured force area; Contrary, screw changes each other to a side that deviates from, namely protruding tine and sunken tine a side of each other come away, the cubage between tine is expanding form inferior pressure, call low-pressure force area. Have the aid of of this two area is separated at the osculatory line of housing, rotor, thinking the axes of two rotor is planar roughly is tall, the interface of low-pressure power division. Additional, the gyroidal channel that forms by the path of contact between rotor of yin and yang makes base yuan the edge is compressed to carry helix movement to exhaust by inspiratory end by the side of the gas inside cubage.

Screw type compressor regards circumgyrate type as a kind of compressor, the characteristic of centrifugal type compressor is had on the structure, the category of cubage type compressor is belonged to again on working principle.

Defect:

1.The treatment precision demand of the dimensional curved surface of gyroidal rotor is high;

2.The path of contact between rotor cannot achieve better step sealed and the restriction that accepts rotor stiffness to wait, at present screw type compressor still cannot achieve higher cease pressure;

3.Periodic high speed passes medium suck, steam vent mouth, wait for a reason through the leak of aperture, make compressor noise big, need adopts amortization to decrease measure of a confusion of voices;

4.As a result of above characteristic, screw type compressor applies at following operating mode commonly:

1.Discharge is not very tall

2.Need to grow cycle to move smoothly

3.Exhaust pressure is not high

Housing:

By airframe, inspiratory end carry a composition with exhaust, it is the main component of compressor. Airframe is join the central part of each component, it offers correct assembly for each component the position, make sure shade, in relief rotor is inside air cylinder clench the teeth, reliable ground has the job. Appearance of its end panel is ∞ form, of this and rotor of two clench the teeth outside columnar face posture suits, make rotor loads airframe accurately inside. The radial and inspiratory orifice that accords with rotor corner requirement is set in airframe wall face, make sure rotor realizes inspiratory process smoothly in rotate.

Suck, exhaust is carried it is to be located in airframe around the sealed join of two end, the end panel that it divides airframe is sealed outside, more important is to offer the bearing of shade, in relief rotor and bearing rotor to assemble the position.

Rotor:

Implement the main part that transfiguration type compresses, by composition of shade, in relief rotor. Rotor tooth form is the special machine tool that uses high accuracy, special cutting tool machine and become, it is one of crucial parts of compressor. Rotor molded lines often is unilateral asymmetrical cycloidal — circular arc molded lines. Shade, in relief rotor has on the structure the following two kinds of means:

1.In relief rotor and electromotor connection are active rotor, deliver torsion, at the same time, through clench the teeth the relation drives shade rotor (driven rotor) rotate.

2.Shade, in relief rotor passes the driving gear clench the teeth that respective driven gear and electric machinery drive, deliver torsion.

Bearing:

Bearing is bearing shade, in relief rotor, assure the spare parts that rotor high speed rotates. Among them electric machinery end uses roller bearing commonly, have the effect that prop up. Next, when rotor is rotating and compressing gas, can produce axial thrust, to overcome force of this kind of axial, the other one aspect of the matter of rotor uses inclined column bearing, overcome the axial force that rotor rotates already, still bear radial load.

Screw compressor majority adopts fuel injection type to lubricate. Through lube and cut down expense mix enter compressor, undertake lubricating mixing to the machine as the flow of medium sealed. Its advantage is as follows:

1) drops exhaust temperature.

2) reduces labour qualitative leak, improve sealed result.

What 3) enhances pair of component is lubricant, improve component life.

4) has to sound wave absorb and damp action, can reduce noise.

Impurity of machinery of 5) rinse out, decrease wear away.

But because fuel injection amount is larger, must add lubricant system so, compressor exit also must add oil gas segregator, this will increase the bulk of aircrew and complexity. In the meantime, the medium to allowing to pollute cannot use this kind of means. So, also having partial screw compressor is to not have inside machine oil-lubricated.

Use mix to the stiffness of the clearance of clench the teeth of rotor of yin and yang, rotor without oil-lubricated compressor the treatment quality of quality and whole set asks taller.

Electric machinery system:

Lead plane and electric machinery join – – – rigid

Transmission way – – – – – – gear

2, cooling / separate system:

Cooling system is one of very important parts in air compressor, much heat is released after be being compressed because of air, after these quantity of heat should rely on cooling system to make hot trade, take away. Leng Shihe of wind of cooling system cent is water-cooled two kinds big.

(1) system of refrigeration of wind cold pattern

System of refrigeration of wind cold pattern includes fan and condenser two large parts, condenser uses aluminium to make heat exchanger of board wing type, fan blows cold air compulsively to condenser, air been sheddinging condenser to come loose hot wing a short while, with compress air or lube to make hot trade, take away quantity of heat, achieve refrigeration to reduce the effect of air and cooling lube.

Use wind is cold model aircrew needs to notice:

1, the temperature of cold air (be equal basically at environmental temperature) very important, cannot exorbitant, the proposal does not exceed 40 ℃ .

2, condenser is exposed in air, wing piece on can touch dirt, if collect dust too much, can affect result of condenser heat exchange badly. Reason often should be used compress air general wing piece exterior dirt is blown clean. When be like a circumstance to cannot be blown badly clean, must clean with cleaner, when component of cleaning machine group, forbidden use combustible explode easily, easy volatilization clear lotion.

When cleanness, can ravel cover board of condenser bracket lateral, use hold wind gun to be blown up sweep.

(2) water-cooled cooling system

Introduce envelope type cooler. One uses refrigeration to compress air for hind condenser, another condenser that it is oil is used at the lube before cooling gush enters airframe. This kind of condenser is cloth of parallel in envelope platoon copper pipe of a lot of thin wall heat exchange, water walks along copper pipe inside, outside heating up oil or hot air to walk along copper pipe, after be being exchanged through heat, water takes away oil and airy quantity of heat.

Water-cooled condenser is right environmental temperature condition relatively not sensitive, and temperature of easier control exhaust. But if cooling water water quality is too poor, criterion condenser writtens guarantee easily dirty block, or be corroded, bring about safeguard cost to increase. Cause condenser to damage badly even and discard as useless. Proposal cooling water should achieve the following requirement at least:

Hydraulic: 32 OC of lukewarm ≤ of water of 0.5MPa of 0.2MPa needing ≥ , ≤ , entrance, water quantity differs according to type and differ.

Be in the area with better water quality, water quality emollient must be joined in circular water, change water regularly. If water is medium foreign matter is too much, must be in inlet tube of pneumatics machine cooling water adds the filter that install water on the road.

Water-cooled aircrew also can install a small-sized fan, be used within box medicinal powder hot.

Cooling system includes air condenser (aftercooler) with oily condenser (before condenser) , they cool through the fan that brings on electric machinery. Aftercooler characteristic: 1. Refrigeration compresses air from what open unit. 2. Make amount to the water content of 70% to come condensation separate out.

System of refrigeration of wind cold pattern:

Cooling system includes air condenser and oily condenser, they cool through the fan that brings on electric machinery. The condenser before oily condenser is is used at cooling oil, aftercooler is used at refrigeration to compress air.

Jacket of fuel injection system has, when oil lukewarm under 40 ℃ when, oil does not enter airframe directly via condenser. When oily Wen Chao crosses 55 ℃ , this a powerful person shuts main engine of the reentrance after making all oil cool through oily condenser.

Lukewarm charge a powerful person:

Oily filter:

Micron grade

Protect lead plane bearing

Maintain a system clean

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Lead plane improves refrigerant life

Stop oily electromagnetism a powerful person:

Action:

1, when unit operates

Ensure nod oiling for oil to each;

2, stop when aircrew whole oil path is cut off when machine

Lest refrigerant from compressor inspiratory mouth appears.

Stop go against a powerful person: Prevent to invert and stop oil of the refrigeration when machine to enter lead plane

Oily separate system:

1.Will compress air to come out from the depart in lube.

2.Ensure lube stays in the system.

3.Reduce the oil content in user air conduit.

Action:

1.Store refrigerant.

2.Primary and detached.

Composition:

1.Cylinder

2.Oily detached core (change 2 years 1 times)

3.Answer vitta

4.Valve of the least pressure

3, the regulating system that enrage a road:

Valve of the least pressure:

1.The setting is in the open when 4.0 Bar (4.2 kilograms)

2.Prevent segregator to suffer low-pressure concussion, maintain its pressure

3.Conduce to separate system

4.Prevent a canal to net pressure is uninstalled in aircrew or stop cooling system is entered when machine

4, control circuit system:

Take gas butterfly a powerful person:

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Protection system:

1.Lead plane high temperature is protected—Temperature switch

2.Shed protection too———Advocate electric machinery heats up relay 1OL

3.Fan electric machinery heats up relay 2OL(M37)

4.Pressure vessel protection—-Relief valve

Temperature switch:

1.Switch of temperature of exhaust of M250 lead plane (1ATS)—C of 119 °

2.Switch of temperature of bearing of M250 lead plane (5TS)—–C of 109 °

Care and maintenance:

1.Change on time oil filters core: For the first time 150 hours, later most 2000 hours.

2.Change on time refrigerant: Exceed cold most 8000 hour or 2 years.

Each systematic work principles analyse screw pneumatics machine