One, the troubleshooting of air compressor
Common failures of air compressor
1. Fault phenomenon: the exhaust temperature of the unit is high (over 100 degrees C)
The coolant level of the unit is too low (it should be seen from the oil peep, but not more than half).
Oil cooler oil dirty; filter clogging; temperature control valve fault (element bad); solenoid valve without damage or electric coil; solenoid valve diaphragm rupture or aging; fan motor fault; cooling fan is damaged; the exhaust pipe is not smooth or exhaust resistance (back pressure); environmental temperature exceeds the range of the provisions of (38 or 46 DEG C); temperature sensor fault (Intellisys control unit); pressure gauge (fault relay control unit).
2. Failure phenomenon: large oil consumption of the unit or large oil content in compressed air
Cooling dose too much, the correct position should be observed in the unit load, the oil level should be less than half; return pipe plug; return pipe installation (the bottom of the core and the distance separating oil) does not meet the requirements of the unit operation; the exhaust pressure is too low; oil separation core rupture; separating cylinder body diaphragm damage unit; there is leakage of coolant; deterioration or extended use.
3. Failure phenomenon: low pressure of unit
The actual value is greater than the unit output volume; valve fault (not closed loading); intake valve fault; hydraulic cylinder fault; load solenoid valve (1SV) fault minimum pressure valve stuck; user pipeline leakage; the pressure setting is too low; the pressure sensor fault (Intellisys control unit); pressure gauge (fault relay control unit); pressure switch fault (relay control unit); pressure sensor or a pressure gauge input tube leakage;
4, failure phenomenon: the exhaust pressure of the unit is too high
Failure of intake valve, hydraulic cylinder failure, load electromagnetic valve (1SV) fault, pressure setting too high, pressure sensor fault (Intellisys control unit), pressure gauge fault (relay control unit), pressure switch failure (relay control unit).
Two. Judgment and elimination of oil leakage fault in air compressor
(1) the air compressor oil leakage, should pay attention to the oil seal position, check whether the oil seal is cracked, the inner lip is cracked or flanged. One of the above cases should be replaced; check whether there is a scratch and defect on the combination surface of the oil seal and the main shaft, and the replacement should be given to the defects and scratches. Check whether the oil return is smooth, the oil return is not smooth, the pressure of the crankcase is too high, resulting in the oil leakage or falling off. The minimum diameter of the return pipe must be ensured, and it will not be twisted or bent, and the oil will return smoothly. Check oil seal, box with the size, do not meet the standard to be replaced.
(2) to move the spindle to check whether the neck is too large and the gap is too large to replace the Bush and oil seal at the same time.
(3) check the sealing condition of each joint seal, repair or replace the sealing pad, check the screw and screw of the inlet, back oil joint and box and tighten it.
(4) the air compressor leak check and adjust the tightness of the belt, the thumb press 10 millimeter is suitable.
(5) the air compressor oil leakage, the need to check the box casting or processing defects, repair or replace the defective parts.
Analysis of overheating faults
In the day-to-day operation of air compressor, the overheating failure of air compressor will occur because of the long time overload operation of the air compressor.
Overheating failure of air compressor:
(1) the exhaust temperature of the air compressor is too high.
(2) perm at the operating position.
Three. Analysis of causes of cracks in air compressor machine parts and inspection and maintenance methods
The common causes of cracks in air compressor machine parts are:
(1) the cooling water is in the head of the cylinder of the body, and the water is not frozen in time after the parking in winter.
(2) the internal stress produced in casting casting is gradually enlarged after the use of the casting.
(3) as a result of mechanical accidents, such as piston rupture and connecting rod screw breaking, the connecting rod will break off and fall off, or the balance iron on the crankshaft will fly out and destroy the body, or the parts will fall off in the air cutting, and the top of the cylinder will fail.
The inspection and maintenance methods for the occurrence of cracks are as follows:
(1) penetration of kerosene method: check process is the first wipe with cotton soaked in kerosene head body, cylinder head, and then dry the cotton waste kerosene to clean Jiang may crack place, and these places on the map immediately in white, at this point in the crack place, kerosene can seep into the white powder on the site, and the length of the crack is clearly displayed.
(2) water pressure method: water pressure method is used to increase the pressure of cooling water to check the part of the crack. The water pressure inspection is carried out on a special equipment, a water pressure tester. In the enterprises with poor equipment environment conditions, some simple equipment can also be checked with ordinary hand pump. That is to say, first try to block up the water pipe joints of the engine block or cylinder head. Only connect one of the water pipe joints with the rubber pipe and the outlet of the pump. The flat surface should be selected with a special size cover, so that the cooling water can not overflow. Then switch on the switch and press the pump, and the room water goes into the cooling water jacket. When the switch is out of water, the switch is closed and the pump continues to press, so that the water supply is stopped when the pressure meter pointer reaches 3-4 atmospheric pressure. At this time, the existence of cracks can be judged by checking the phenomenon of leakage or water leakage between the upper and the bottom of the body and the head of the cylinder.