Troubleshooting and Maintenance of Medical Hyperbaric Oxygen Chamber Air Compressor He Yangang (Department of Equipment, Heilongjiang Hegang Mining Group General Hospital, Hegang 154100, Heilongjiang)[]TH789[]B[Article ID]1002-2376 1 Cylinder failure 1.1 Fault phenomenon (1) The piston and the cylinder are improperly matched, the clearance is too large, and the air leakage is formed, which affects the displacement; (2) The cylinder head and the cylinder block are not tightly coupled, and the cylinder head gasket is broken or not tightly formed during assembly, which affects the displacement. (3) Cylinder wear or scratches exceed the maximum allowable limit, forming a leak, affecting the exhaust volume; (4) Poor cylinder cooling water supply (cooling water pipe blockage or gas water jacket excessive water), gas passing through the valve When the chamber enters the cylinder, it forms a preheating, which affects the displacement. 1.2 Troubleshooting method (1) After boring and milling the cylinder of the repaired compressor, it is necessary to assemble a suitable piston and piston ring; (2) scrape the joint surface of the cylinder head and the cylinder block or replace the new cylinder head gasket; (3) scraping or Re-milling the cylinder, grinding and repairing the worn and strained cylinder, and replacing the enlarged piston and piston ring; (4) ensuring proper cooling water, so that the cylinder does not exceed the specified temperature. 2 piston ring failure 2.1 failure phenomenon (1) piston ring due to excessive use of time has serious wear; (2) piston wear or cylinder wear, its conicality, ellipticity exceeds tolerance too much, resulting in air leakage; (3) Due to the poor quality of the lubricating oil or insufficient injection volume, the piston ring is too high in the cylinder to form a seizure phenomenon, which reduces the displacement and may cause the pressure to be redistributed in all stages. 2.2 Troubleshooting methods (2) Repair the cylinder and piston to the specified clearance, or replace the new cylinder, piston, piston ring and other components; (3) remove the piston to check the piston ring, and clean the groove on the piston, Reuse the cleaned piston ring for serious damage. Check the oiler and oil line to ensure good oil in the cylinder. 3 Safety valve leakage is serious 3.1 Failure phenomenon (1) There is impurity between the safety valve and the valve seat to make the valve surface contact not tight; (5) The bearing surface of the valve spring is not perpendicular to the spring center line, and is deflected after the spring is pressed. Causes the valve to be unevenly stressed, causing warpage and causing air leakage or oscillation. 3.2 Troubleshooting method Seat contact surface; (4) Check thread damage, keep tight during assembly; (5) Pay attention to assembly and maintenance, use springs that meet the requirements. 4 cylinder superheated exhaust gas temperature rise 4.1 failure phenomenon (1) the piston rod in the moving mechanism is bent, so that the piston does not perpendicular to the cylinder in the cylinder and the tilting friction between the piston and the veneer increases the high temperature; the wall affects the cooling; (4 The rear stage cylinder is overheated, it may be that the intercooler lacks water, the compressed air discharged from the front stage cylinder is not cooled, or the intercooler is not well cooled; (5) the cylinder clearance is too small, so that the upper and lower dead point compression ratio Excessively large, or the cylinder clearance is too large, too much high pressure gas remaining in the cylinder, causing the temperature inside the cylinder to rise; the failure of the Varian 2100C linear accelerator treatment bed can not be reduced Chen Xiao, Liu Xuhong (Yunnan Province Cancer Hospital, Kunming Medical College, Third Hospital Radiotherapy Center, Kunming, Yunnan 650118, China) Fault phenomenon: the treatment bed can not rise, the other movements of the machine are normal. Trouble shooting: use another normal working hand control box and bedside control box lifting bed, the fault remains, and the manual control box can be eliminated. Remove the movable dust cover of the bed, pull out the bed lift motor power supply plug J31, and measure the DC voltage between pins 1 and 2 of J31, with the polarity of 1 pin being positive and the polarity of 2 feet being negative, according to the manual control box When the bed speed up button is pressed, there is a change of 0~100V between the two feet. When pressing the speed control down button of the manual control box at the bedside, there should be a change of -100V~0V between the two legs. The measured voltage is 0V, which indicates that the power supply of the lift motor of the bed is not normal, and the motor fault can be eliminated. Observe the bed lift motor drive box A2 (part number; 78-100113) located at the upper left of the left side of STAND. When the bed down button is pressed, the sound of the relay is heard, indicating that the control circuit is basically normal, but the status indicator of A2 LED1 does not turn from red to green. Measure the voltage of pins A and P2 of the A2 output to the motor. Press the up button to have +70V normal. Press the down button 0V. It is abnormal. Normally it should be -70V. Check the voltage of each pin of the input plug P1. 11 feet of P1 INHIBIT Voltage, when pressing the down button, there is 3. 5V normal, P1's 4 pin + REFIN voltage, 0 is normal when the down button is pressed. The 6 and 7 feet of P1 are the speed feedback end and do not affect the lifting of the bed. The 5 feet 100V of the input power supply voltage P1 are measured. It is judged that the drive box A2 is malfunctioning. Power off, loosen the 5 screws of P2, and remove 5 wires and mark them. Pull out the plug P1. Remove 2 fixing screws and take out the drive box. Remove the cover, take out the 5 screws of the fixed circuit board, check the separate components of the circuit board, and find that the three legs of one of the four FETs IRFP250 have been broken down. After purchasing one replacement, the machine returns to normal. Summary: Check that the voltage at each input of the board is normal and the voltage at the output is abnormal. It can be judged that the circuit is faulty. Some boards with power amplification can be disassembled for maintenance. Common power amplifier tubes are broken down and can be bought in the electronics market. This can reduce downtime and save money. (6) Dry friction caused by failure of the piston or piston ring or lack of oil in the cylinder. 4.2 Troubleshooting method (1) Check the movement of the piston in the cylinder. If the running side of the cylinder is worn, the whole piston group should be pulled out to check whether the piston rod is bent. The bent piston rod should be repaired or replaced in time; (2) Check the cylinder water jacket and find that when the water accumulation is too much, the cylinder water jacket should be cleaned to remove water pollution; (3) Increase the flow of cooling water and adjust the cooling water. Inlet water temperature should not be too high, check the water supply pipeline, perform thorough cleaning when plugging; and clean the cooler; (5) adjust the upper and lower dead space of the cylinder to keep the gap within the specified standard; (6) check the piston and piston ring And the oil pump pumps the cylinder. 5 air compressor daily maintenance oil temperature gauge, etc.) and lubrication conditions (such as oiler, mailbox and lubrication points) and cooling water flow; (2) listening to the sound of the machine operation, can often listen to the listener (3) Diligently touch various parts, and observe the temperature change and vibration of the air compressor, such as the temperature of the drain after cooling, the temperature of the oil, the temperature and vibration of the machine during operation, so as to detect the abnormal temperature rise and the fastening of the machine early. (4) Pay special attention to the safety of the entire machine and equipment, and find out the problems in a timely manner; (6) Seriously do a good job in the safety and health of the machine room, keep the air compressor clean, and do a good job in the handover.
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