Graph Wen Bingmao | Clearance of screw compressor rotor adjusts method and measure
Screw compressor (what the article basically discusses is craft screw compressor and dry type compressor of the screw that do not have oil) bearing, axis seals the overhaul that waits for component and centrifugal type compressor roughly identical, its overhaul core point to depend on realizing rate of clearance of clench the teeth of pair of shade, in relief rotor to adjust through synchronous gear with control. Screw compressor is shade, in relief the helical gear that rotor is a pair of mutual clench the teeth actually, accordingly, will synchronous gear and screw rotor serve as part of a whole to have a consideration, clutch theory of gear clench the teeth to be a foundation with positive drive the Communist Party of China, through changing the starting phase character between shade, in relief rotor, realize the adjustment of rate of clearance of clench the teeth of screw compressor rotor thereby.
Clearance design
When screw compressor works, high speed of rotor of electric machinery drive is rotational, and two end panel of compressor housing are dormant, certain end panel clearance exists necessarily between them, and the end panel clearance that needs to adjust as the accretion of screw compressor power also can increase. The very important one step when screw compressor rotor is being assembled adjusts clearance of exhaust end panel namely, tone congress reduces compressor capacity, shift is little bring about rotor and exhaust end panel easily to produce clash. So, size of space of end panel of screw compressor exhaust is an architect according to the project practical experience decides.
The element such as the material that clearance of end panel of exhaust of general screw compressor is the size according to compressor power, operating conditions, rotor and its cylinder body decides integratedly. Want to assure clearance of end panel of screw compressor exhaust to change inside certain limits only, can make sure compressor moves normally.
Rotor runs a characteristic
Tooth flank of screw compressor rotor basically is used at compressing gas, by shade, this world the alveolar and mutual clench the teeth of two rotor makes many jobs pitch. Do not have oily screw compressor to craft screw compressor and dry type, not straight contact is felt in process of job of among them shade, in relief rotor, the motivation between two rotor is delivered undertake through synchronous gear. Tooth form of screw rotor end panel is mixed except contented conjugate clench the teeth outside facilitating treatment, still must have small leak triangle and bigger area utilization factor and taller cubage efficiency to wait. So, the rotor molded lines of screw compressor basically reachs parabola to wait by linear, cycloidal, circular arc, ellipse multistage curvilinear from beginning to end is tangent composition. Screw compressor is the most important is molded lines of rotor end panel, the stand or fall of rotor molded lines decided the actor bad of screw compressor function.
Academic basis
Craft screw compressor and dry type rely on synchronous gear to undertake controlling without clearance of clench the teeth of oily screw compressor. The active, driven gear of synchronous gear is rotor of in relief, shade correspondingly to have same pitch circle with its. Because driving gear and in relief rotor are connective relying on key, can regard them gear of a whole. However driven advocate circle of unoccupied place tine of tine circle and back is covered go up in hub, after joining through key when hub and shade rotor, appearance of two tine group is adjustable to reaching shade rotor to still be had at hub quality.
Deputy to a pair of specific gear, when it is certain that the center is apart from, by gear oneself character parameter decides backlash of gear deputy clench the teeth. Same, clench the teeth of shade, in relief to screw compressor rotor, in oversight bearing windage the circumstance of little impact issues the span in be opposite, total space of screw rotor clench the teeth also is calm value. In maintaining a course, when undertaking adjustment to clearance of screw compressor clench the teeth, maintain shade rotor to be not moved, fine tuning driven gear is encircled, namely the position that through altering the fixed position between the hub on the driven gear circle of synchronous gear and shade screw rotor sells, make fit of horn of starting phase of clench the teeth of rotor of shade, in relief screw alters pettily, the pursuant face clearance that completes pair of screw rotor node to go up then and blame chase face space to undertake repartition.
Executive measure
Circle of loose driven gear and annulus firm the close solid bolt between and fixed position are sold, make its agile and movable. Make through turning shade, in relief rotor is contacted cheek by jowl, accurate the total space that measures clench the teeth of a shade, in relief rotor. The difference that chases face clearance with the clearance value of the hope and total space cipher out is worth, be worth through turning general and difference of the clearance that pursue a range next equal or between the pursuant face region of engagement that the feet of a place of strategic importance of close places in shade, in relief rotor. The screw on gear of synchronism of marvellous stroke of usable when adjust copper, be stopped by impaction till feet of a place of strategic importance.
driven gear the circle turns with driving gear just the position of clench the teeth, if the attention is necessary can set gear backlash a side that ages in clench the teeth thoroughly, screw the close solid bolt between driven gear circle and hub. Take out the feet of a place of strategic importance between shade, in relief rotor, right now clearance is clearance of clench the teeth of tooth flank of shade, in relief rotor namely, but for reliable case, need at the same time turning is examined with one by one of feet of a place of strategic importance at the same time, attentive measure rotor the clearance of clench the teeth of each place.
Total gap of clench the teeth of the shade of screw compressor, in relief rotor is bigger, so of rate of its device clearance adjustable range is big. Generally speaking, rate of screw compressor clearance should be controlled in 0.8 ～ 1.2 between. Actually, when screw compressor high speed is rotational, because dentiform heat is out of shape,reach gear tooth flank wear away wait for an element, incline to of the clearance that pursue a range at reducing, be not incline to of the clearance that pursue a range at increasing. Run reliably to ensure compressor is long, move the space that pursue a range when maintenance a bit bigger, be not the space that pursue a range shift is a bit less, the ratio that makes the clearance that pursue a range and blame seek face clearance in 1 ～ 1.2 between more reasonable.
The adjustment of clearance of screw compressor clench the teeth, it is the most crucial one step in whole maintenance, matter to screw to compress function to deny normal movement directly, it is the operation with a bigger difficulty, need to adjust ability to accord with a requirement repeatedly sometimes. Afore-mentioned is different from traditional thinking, introduce converse idea, give the starting phase of rotor beforehand, adjust driven gear to circle and active tine encircle clearance of clench the teeth and be secured with close solid bolt next. Below normal circumstance, this kind of method can get according with the clearance of screw compressor clench the teeth of the requirement directly, decreased to repeat measure clearance and the time that adjust driven tine circle, shortened effectively maintenance is periodic.
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