Summary of technical points of mobile air compressor

Summary of technical points of mobile air compressor

The technical points of the mobile air compressor are summarized as follows:

What is the reason for the abnormal increase in the first-level suction temperature?

There are two reasons for 　

　: 　　The first-stage suction cutting is bad and the backflow is generated;

　　 Due to heating of the suction line.

elimination method:

　　 Replace bad suction cut;

　　 Remove the high temperature machine close to the inhaler;

　　 Strengthen the ventilation of the compressor room.

　　 What is the reason for the abnormal increase in the intermediate stage suction temperature?

　　 The backflow is generated due to the loud air cutting of this stage; the effect of the previous stage cooler is low.

elimination method:

　　 Replace the bad suction valve; ensure the cooling water quantity and clean the cooler.

　　 What is the reason for the abnormal increase in the first-stage exhaust temperature? How to exhaust?

　　Reverse flow due to poor first-stage suction cutting;

　　 Increased pressure due to poor secondary suction;

　　 Because of the large resistance of the first and second pole connecting pipes;

elimination method:

　　 1. Remove one-pole suction valve and replace with new parts;

　　 2. Remove the two-pole suction valve and replace with new parts;

　　 3. Check the pipe of the pole and clean it.

　　What is the reason for the abnormally low exhaust temperature in the intermediate stage?

　　 Due to the leakage of the second-stage suction to the outside of the machine, the exhaust pressure drops. (90% of practitioners have followed the WeChat public platform of Compressor Network)

elimination method:

　　 Check the leaking part and stop the leak.

　　What is the reason for the abnormally high exhaust temperature in the intermediate stage?

　　 Due to the low efficiency of the front cooler;

　　The pressure rises due to the low efficiency of this stage of cooler;

　　 Due to poor exhaust cutting, backflow occurs;

　　The exhaust pressure rises due to the poor suction cutting of the second stage;

　　 The resistance of connecting the secondary pipeline is large.

elimination method:

　　 1. Clean the cooler;

　　 2. Ensure the amount of cooling water;

　　 3. Overhaul or replace the gas cutting;

　　 4. Remove all the dirt in the smile.

　　 What is the reason for the abnormally low intermediate suction temperature?

　　Release logging and bypass logging are not tightly closed.

elimination method:

　　 To close the release logging and bypass logging.

　　What is the reason for the high secondary exhaust temperature?

　　Due to the poor ventilation conditions of the compressor working environment, the intake air temperature exceeds 40℃;

　　 The cylinder is severely worn;

　　The intercooler is too dirty;

　　The fan speed is low;

　　The cooling water flow is insufficient;

　　The clearance volume of the secondary cylinder is too small (too small air storage);

　　 The intake or exhaust flap is stuck.

elimination method:

　　Improve the working environment so that the intake air temperature does not exceed 40℃;

　　Check to find out the cause of the cylinder pull and repair;

　　 clean the cooler;

　　Adjust the tightness of the fan belt;

　　Adjust the clearance volume of cylinder and air valve;

　　 Check to rule out the phenomenon of gas cutting stuck.

　　What is the reason for the overheating or increasing temperature of the cylinder?

　　The continuous increase in cylinder overheating temperature is mainly related to cooling and lubrication. The main reasons are the following points:

　　The cooling water in the water jacket and cylinder head is insufficient or the cooling water is interrupted;

　　 The secondary cylinder is overheated, it may be that the intercooler lacks water, the compressed air discharged from the primary cylinder cannot be cooled, or the intercooler is not cooled well;

　　 Too much sediment in the water jacket (too dirty) attached to the cylinder wall to affect cooling, and the cooling pipe is blocked;

　　The deflection of the piston assembly increases friction and heat generation in the cylinder or the lack of oil in the cylinder causes dry friction;

　　 Cylinder clearance volume is too small, so that the compression ratio of the top and bottom dead center is too large or the cylinder clearance is too large, and there is too much high-pressure gas remaining in the cylinder, which causes the temperature in the cylinder to rise; 　　The suction temperature is too high;

　　 Gas leakage in the exhaust valve;

　　The piston rod in the motion mechanism bends, causing the piston to be out of verticality in the cylinder exceeding the stipulation, causing the piston and the cylinder to tilt, and the friction increases and high temperature is generated.

elimination method:

　　 When the cooling water supply is insufficient (the water temperature is higher at this time), it can be increased appropriately;

　　 After the cooling water is cut off, stop and check immediately, and start driving after the cylinder cools down;

　　Clean the cylinder and liner and cooler;

　　Check the lubrication system and adjust the oil supply appropriately;

　　 Adjust the top and bottom dead center gap of the cylinder to keep it within the specified standard;

　　 Adjust the piston assembly to be concentric with the cylinder, if the piston rod is bent, repair or replace;

　　 Lower the suction temperature;

　　 After determining which gas cutter should replace the gas cutter parts.

　　What is the reason for the overheating of the piston rod?

　　The clearance between the piston rod and the packing is too small;

　　 The piston rod and the packing are skewed during assembly;

　　 The surface of the piston rod is rough;

　　 The lubricating oil of the piston rod and the packing is dirty or insufficient lubricating oil causes dry friction;

　　 The gas and oil are mixed with impurities in the filler;

　　 The metal disc sealing ring in the stuffing box cannot be stuck and cannot move freely;

　　The stuffing box with cooling device is not cooled well;

　　 When the stuffing box is assembled on the fuselage, the bolts are not tightened properly, causing the piston rod to tilt. When the piston rod is running, the friction of the metal disc in the packing increases and heat is generated.

elimination method:

　　 Re-assemble the packing and adjust its fit gap appropriately;

　　 The piston rod shall not be deflected after reassembly;

　　 Accurately install the reground plug rod;

　　 Clean and change the oil, adjust the oil supply;

　　 make gas and oil clean;

　　 Try it during installation, move freely, and keep a certain gap as required;

　　 Check and adjust the cooling condition of the stuffing box;

　　 Check the stuffing box again and change its tilt.

　　What is the cause of bearing overheating?

　　 The possible reasons when the bearing exceeds the normal temperature during operation are:

　　The bearing and the journal fit unevenly or the contact surface is too small (the fit gap is too small), and the specific pressure per unit area is too large. Most of this happens after the new machine is commissioned or the bearing is replaced;

　　 Bearing deflection or crankshaft bending or twisting;

　　 The quality of the bearing bush is not good, the quality of the lubricating oil is inconsistent (low viscosity), or the oil circuit is blocked. The oil supply pressure of the gear oil pump is too low, and the oil supply is interrupted, causing the bearing bush to lack oil and produce dry friction;

　　 The bearing has debris or too much lubricant, or the lubricant is too dirty;

　　 The bearing bush has uneven and excessive wear;

　　 When the compressor is installed, the main shaft coupling of the main shaft and the electric motor (or diesel engine) is not aligned, and the error is too large, causing the two shafts to tilt. (90% of practitioners have paid attention to the WeChat public platform of Compressor Network)

elimination method:

　　Scrape and grind the bearing bush with a coloring method to make the contact surface meet the requirements and improve the specific pressure per unit area;

　　 Properly adjust the fit clearance, check the bending and twisting of the crankshaft, and replace or repair the crankshaft as appropriate;

　　Use bearing bushes that meet the quality, check the oil pipeline and gear oil pump, use lubricating oil that meets the quality requirements, check and adjust the oil pump to make the pressure meet the requirements;

　　 Clean and replace the new oil, adjust the oil pressure;

　　Replace the new bearing bush;

　　 The concentricity of the two machines should be correct, and the tolerance value of the leveling should conform to the value specified in the machine manual. Especially when the compressor and the motor are connected by rigid connection, more attention should be paid to alignment.