How to increase the displacement of the compressor and the common problems of the compressor

How to increase the displacement of the compressor and the common problems of the compressor

1. How to increase the displacement of the compressor?

　　Answer: Increasing the compressor's displacement (air delivery) means increasing the output coefficient. The following methods are usually used:

　　 (1) Correctly choose the size of the clearance volume;

　　 (2) Maintain the tightness of the piston ring:

　　 (3) Maintain the tightness of the air cutting and stuffing box:

　　 (4) Maintain the sensitivity of inhalation and exhaust;

　　 (5) Reduce the resistance during gas inhalation;

　　 (6) Dryer and colder gas should be inhaled;

　　(7) Maintain the tightness of the output pipeline, gas valve, gas storage tank and cooler;

　　 (8) Increase the speed of the compressor appropriately;

　　(9) Adopt advanced cooling system;

　　 (10) When necessary, clean the cylinder and other parts.

　　 2. Why is the discharge temperature limit so strict in the compressor?

Answer: For compressors with lubricating oil, if the exhaust temperature is too high, the viscosity of the lubricating oil will decrease and the performance of the lubricating oil will deteriorate; the light fractions in the lubricating oil will evaporate quickly and cause "coking" phenomenon. Facts have proved that when the exhaust temperature exceeds 200°C, the "coking" is quite serious, which can block the passage of the exhaust valve seat and the spring seat (the valve file) and the exhaust pipe, and increase the channel's negative force; "It can make the piston ring stuck in the piston ring groove and lose the sealing effect; if the electrostatic action will also cause the "carbon deposit" to explode, the exhaust temperature of the power compressor water cooling does not exceed 160℃, and the air cooling The temperature does not exceed 180°C.

　　3. What are the reasons for the cracks in the machine? How to check?

　　 Answer: The common causes of cracks in mechanical parts are:

　　 (1) The cooling water is in the cylinder head of the machine body, and it freezes when the water is not released in time after parking in winter;

　　 (2) Due to the internal stress generated during casting, it gradually expands significantly after vibration in use;

　　(3) Caused by mechanical accidents, such as piston rupture, connecting rod screw breakage, causing the connecting rod to break and fall off, or the balance iron on the crankshaft fly out and damage the machine body or the parts in the gas fell to break the cylinder head.

　　The inspection methods are as follows:

(1) Kerosene penetration method: During inspection, first wipe the body and cylinder head with cotton yarn end soaked with kerosene, and then wipe off the suspected cracks with dry cotton yarn end Jiang kerosene, and immediately add white powder. At this time, Where there is a crack, the kerosene penetrates into the white powder, and the location and length of the crack are clearly displayed.

　　 (2) Water pressure method: The water pressure method uses a method to increase the pressure of the cooling water to check the cracks.

　　In a repair shop with better equipment, the water pressure check is carried out on a special equipment, a water pressure tester. In units with poor equipment conditions, some use ordinary hand-pressed water pumps to rebuild simple equipment. When checking, first try to block the water pipe joints of the body or cylinder head, and only connect one of the water pipe joints to the pump outlet with a rubber tube. The upper plane of the machine body should use a special cover plate of equivalent size to prevent the cooling water from overflowing. Then turn on the switch to press the water pump, and the room water enters the cooling water jacket. Turn off the switch after the water is discharged from the switch, continue to press the water pump, and stop the water supply when the pointer of the pressure gauge reaches 3-4 atmospheres.

　　 At this time, you can carefully check the body, whether there is water leakage or seepage phenomenon inside and outside the upper and lower cylinder head.