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Q & a series of technical problems of air compressor (eight)
Author: 志和      Release Date:2014/5/8      View Count:2010
 

"Q & a series of technical problems of air compressor (seven)" refer to: http://www.dg-zhihe.com/cn/newsshow.asp? Id=427

Small make up: at present a lot of used chrome, high frequency quenching, surfacenitridation method to improve the surface hardness of the piston rod

, but why piston type air compressor for processing the surface of the piston rod?What effect is there?

Chi and Technology Master: sealing surface of the piston rod should be to ensure that the minimum wear under the long-term work, the cylinder pressure is large, thering on the pressure seal to the piston rod of the sealing pressure. Therefore, the working surface in contact with piston rod reciprocating stroke gas sealing element,should have a higher wear resistance hardness and smoothness, to ensure the sealing action necessary to prevent wear, leakage.

Small make up: why piston type air compressor packing abnormal wear, burn?

Chi and Technology Master: packing abnormal wear, burn for several reasons:

1, packing axial clearance is too small, the axial clearance standard assembly;

2, the deflexion of the piston rod and the stuffing box assembly, electric new accurate assembly:

3, the piston rod surface roughness, re grinding or replacement bar;

4, the piston rod and the stuffing of bad, to research;

5, insufficient oil supply, oil volume at;

One inclusion mix 6, gas and oil, to carry out cleaning, keep clean gas and oil.

Small make up: piston compressor why packing leak too much?

Chi and Technology Master: cause of packing leakage can exist in the following aspects:

1, the oil flow is not sufficient, should be appropriate to increase the amount of oil feeding;

2, packing box assembly sequence is not reasonable, should be in accordance with the procedure assembly;

3, packing of bad, should be re research;

4, the surface of the piston rod scratch (Gou Hen), to repair or replacement(grinding);

5, packing box of undesirable (bad contact), deal with the contact plane re scraping;

6, packing box not fastening is not complete, should be fully tighten packing gland;

7, the piston rod movement and center lines are not parallel, should adjust the center;

8, the piston rod to sink, replacing the pillow;

9, spring does not hold, should be properly adjusted;

10, packing axial clearance is too large, should be adjusted according to the provisions of the standard axial clearance.

Small make up: connecting rod bolts need to be replaced under what circumstances?Or do you know what time to replace connecting rod bolts?

Chi and Technology Master: connecting rod bolts in the maintenance, the use of the process found one of the following situations, then it needs to be replaced: damage thread connecting rod bolt; crack connecting rod bolts; the connecting rod bolts andshe had large deformation.

Small make up: safe use period of connecting rod is generally how much time?

Chi and Technology Master: connecting rod use shall generally not exceed25000000xl/n hours (n for speed, unit: r/min).

Even the last bolt elongation is not allowed to exceed the original long 1/1000.

Small make up: how to adjust the clearance between the piston type air compressorcrosshead slipper and body slide

Chi and Technology Master: crosshead slide clearance between the shoe and theslide, is for the expansion of the metal and a lubricating oil with. The gap is too small,will cause the frictional heating; the gap is too large, will cause the impact sound,Jiong accompanied by abnormal heating phenomenon. So we must select the appropriate clearance value. General experience numerical cross head slide<, SPAN space="0| " right-pos="279|9" left-pos="2932|9">clearance for: (0.5/1000) D, D as the crosshead sliding surface diameter, (mm).Contact and joint crosshead slipper and the body condition of slideway availablechecked, contact product uniformity, and shall not be less than 70%, glide shoe andglide path should be tightly, there are not allowed layout clearance, and slipper gapshould be evenly distributed, when the cross head according to the working stroke tocomplex dynamic when, before, in, behind each position with the feeler from every direction slide insert, gap value detected should be equal.

Small make up: why piston ring at work after a period of time will be ground into theside of the thin one thick?

Chi and Technology Master: after used for a period of time will grind again thin one thick has the following several reasons of piston ring:

1, the piston and cylinder is not in a central location. Because in the piston groovefreely to the cylinder wall expansion piston ring, piston ring against the cylinder wall, to close the gas compression. But because of the piston and cylinder is not in a central location, is bound to make the piston and cylinder week gap side clearance and the other side clearance. The large gap in the side, piston ring piston groove sideexposed part of the force, in the compression process is large, the radial resistance,friction.

2, elliptic cylinder is too large, not only can not make the piston ring cylinder attached to the local elliptic degree, but also have a large gap, so that gas passes through thisgap in compression, the piston ring into the side, so that speed up the wear and tear.

The side gap 3, the piston in the piston groove is too small, so that the piston ring due to thermal expansion card in the slot, not free to find the center and lose the outward elastic force and the wear accelerated.

4, the piston ring material itself is not good, outward expansion force is not uniform.So the piston ring in the outward elastic force of the site, causing serious wear.

Reminder.

Chronicles and the electromechanical device limited company to recommend air compressor, water heater, air compressor heat recovery equipment, as long as youhave the air compressor factory, can 0 operation cost of producing hot water andheating.

See details > >

(this paper mainly analyzes the series of technical problems of air compressor quiz,but in actual in the problem solving process is for reference only.)

 
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