Oxygen is an essential element in the normal operation of a hospital. The application of high-tech PSA medical molecular sieve oxygen generators has changed the traditional mode of oxygen being provided by oxygen plants in hospitals. Hospitals can now produce oxygen for clinical use. The working principle of PSA medical molecular sieve oxygen generators is to obtain medical oxygen from the air by utilizing the selectivity of molecular sieves (adsorbents) for nitrogen and oxygen adsorption. Through the application of PSA medical oxygen generators, some fault handling methods and management experience are discussed.
Common fault analysis and handling
1.1 Fault 1
(1) Fault phenomenon: The pressure of the oxygen storage tank is less than 275kPa (40psig), and the equipment cannot start automatically.
(2) Fault repair: PC board has problem (when in automatic mode, when the gas tank pressure is lower than 309kPa (45psig), the equipment should start automatically, and the PC board needs to be replaced.
1.2 Fault 2
(1) Fault phenomenon: the equipment is operating normally, the switch is in automatic mode, the gas tank is full, but the equipment cannot stop automatically, and the oxygen tank pressure exceeds 400kPa (58psig).
(2) Analysis and treatment: ① The oxygen production pressure adjustment controller is improperly set and should be readjusted; ② The oxygen production pressure adjustment controller has problem and needs to be replaced; ③ The wire of the PC board pressure controller is loose, repair or replace; ④ The automatic/manual switch has problem and the switch needs to be replaced; ⑤ The PC board has problem and needs to be replaced.
1.3 Fault 3
(1) Fault phenomenon: The equipment operates normally, but the pressure of the gas tank is still lower than 275kPa (40psig).
(2) Analysis and treatment: ① The air intake pressure is inappropriate. The determined air intake volume and pressure must meet the requirements. Check whether the pipeline is concave. The pipeline diameter should be larger than the size of the inlet end of this equipment. ② The system circulation pressure is inappropriate. Adjust the air intake pressure controller. ③ The flow rate at the oxygen output end is greater than the supply of this equipment. Check whether the oxygen usage is consistent with the production specifications. ④ Whether the gas tank or pipeline is leaking. Check whether there is a problem with the gas tank and pipeline.
1.4 Fault 4
(1) Fault phenomenon: The oxygen machine cannot circulate and the green light is not on.
(2) Analysis and treatment: ① The power cannot reach the requirements from the control parts. Confirm whether the socket and power cord have power. ② If the fuse is blown, replace the fuse.
③ There is a problem with the switch. The switch should be replaced.
1.5 Fault 5
(1) Fault phenomenon: When the automatic/manual switch is switched to manual, the yellow light does not light up.
(2) Analysis and treatment: ① The power cord from the PC board to the switch is loose, repair or replace the wire. ② There is a problem with the PC board, and the PC board needs to be replaced. ③ Low voltage, check whether the voltage meets the requirements.
1.6 Fault 6
(1) Fault phenomenon: The oxygen purity is only 50%~70%.
(2) Analysis and treatment: ① Before the equipment is started, the gas tank is already low purity. After the last shutdown, the gas tank and the pipeline are at low pressure. It should be restarted. ② There was a power outage during operation, and impure oxygen entered the tank. ③ Improper air intake, confirm whether the pipeline has ④ The solenoid valve fails to work properly, and each solenoid valve should be checked. ⑤ There are problems with the wires and PC boards, and the wires and PC boards should be replaced. ⑥ The diaphragm of the solenoid valve is broken and ineffective, and the damaged valve should be replaced. ⑦ The linear solenoid valve does not function properly. There are the following reasons: Check whether the wire connecting the coil to the valve is loose, whether the PC board has problems, and the valve cannot move, fails or wears out. The coil should be replaced, the wires should be inspected and replaced, or the PC board should be replaced.
1.7 Fault 7
(1) Fault phenomenon: The solenoid valve makes noise during operation.
(2) Analysis and processing: ① When the voltage is low, the voltage can be detected and adjusted. ② The PC board outputs low voltage, and the PC board can be replaced. ③ The valve is dirty, and the inside of the valve should be cleaned or replaced. ④ The core of the valve Worn out, need to be replaced.
⑤ EMI filter failed, need to be replaced.
1.8 Fault 8
(1) Fault phenomenon: oxygen purity is too low, only 21% to 50%.
(2) Analysis and treatment: ① Check valve failed, need to be cleaned or replaced. ② Molecular sieve failed, need to be replaced. ③ Equipment is not running properly, PC board can be replaced.
1.9 Fault 9
(1) Fault phenomenon: oxygen contains fine dust.
(2) Analysis and treatment: ① Inlet pressure is too high, can confirm that the intake pressure does not exceed 1035 kPa (150psig). ② Inlet pressure controller is set at 485 kPa (70psig), adjust the pressure controller range. ③ Molecular sieve is contaminated, replace the molecular sieve. ④ System is not running properly, wires or PC board should be replaced.
1.10 Fault 10
(1) Fault phenomenon: The air intake pressure controller is leaking.
(2) Analysis and treatment: ① The air intake pressure controller is leaking gas. Clean and lubricate the controller. ② The entire pressure controller including the base is defective and needs to be replaced.
1. 11 Fault 11
(1) Fault phenomenon: The oxygen machine's drain valve is always discharging.
(2) Analysis and treatment: ① The system pressure exceeds 485kPa (70psig). It should be adjusted. ② The air intake pressure controller is leaking gas. It should be cleaned and lubricated. ③ The air intake pressure controller is blocked by ice. Check whether the recent temperature is higher than 4℃. ④ The system pressure gauge is defective. Adjust the controller to determine whether the pressure gauge needs to be replaced. ⑤ The drain valve is defective and needs to be replaced.
1. 12 Fault 12
(1) Fault phenomenon: The filter drain valve cannot be opened, so it cannot be discharged.
( 2) Analysis and treatment: ①The manual drain button does not work and should be replaced. ②The PC board has a problem and should be replaced. ③The wire connected to the valve is loose, check or replace it. ④The valve coil fails and should be replaced. ⑤The valve core is stuck, and the drain valve can be replaced. ⑥The filter drain valve opens normally, but the discharge volume is very small. The analysis and treatment are as follows: The valve core is stuck and should be replaced; the drain valve is blocked or concave, and the pipeline should be cleaned or replaced.
Management experience
Providing continuous, stable pressure, and qualified medical oxygen is crucial to the hospital's rescue of critically ill patients, the smooth implementation of surgical anesthesia, and patients who need respiratory treatment. In order to better serve the clinic, in addition to the quality and performance of the equipment itself, effective scientific management is also an important factor.
2.1 Strict operating procedures to reduce equipment failure rate
The role of medical oxygen concentrator equipment in clinical treatment is extremely important. The responsibility of engineering and technical personnel is great, Only by deeply understanding the performance and principle of oxygen generator equipment, performing regular maintenance according to the operating procedures, and constantly summarizing maintenance experience can we ensure safe clinical oxygen use and extend the service life of the equipment to better protect people's health.
2.2 Scientific and complete handover records are the basis for equipment maintenance and repair
PSA medical oxygen generator equipment has a high degree of automation. Carefully make handover records, accumulate data on equipment operation, and periodically draw various operating parameter curves and oxygen consumption tables to provide reference for equipment maintenance and repair, and summarize the hospital's oxygen use in order to scientifically arrange oxygen production.
2.3 Combined with oxygen use, ensure that oxygen concentration meets the standard
Combined with the actual situation of oxygen use in our hospital, on the basis of ensuring oxygen concentration, 2 units can be operated during the peak period of oxygen use, and 1 unit can be operated during the low peak period of oxygen use. When the bus is in the normally open state, and its pressure is adjusted to 0.35MPa. When the pipeline pressure is lower than 0.35MPa, the bus automatically starts to supply oxygen to ensure constant pressure in the oxygen supply pipeline and uninterrupted oxygen supply.
2.4 The air source inlet of the oxygen generator should avoid pollution sources
When our hospital first installed the oxygen generator, nitrogen was directly discharged into the machine room. On the one hand, the exhaust nitrogen flow produced noise pollution. On the other hand, although there was ventilation equipment, the high nitrogen content in the air source affected the oxygen production efficiency of the oxygen generator. By installing a continuous U-shaped nitrogen exhaust pipeline, the nitrogen was discharged outside the oxygen generator room, which played a deceleration role, greatly reduced the noise, and avoided nitrogen pollution to the air source.
2.5 Implement humanized management and deal with abnormal situations in a timely manner
The oxygen generator is very noisy during operation. In order to In order to improve the working environment of managers and deal with abnormal situations in a timely manner, we applied a remote monitoring system, which enables managers to understand the real-time operating status of each device in the oxygen production unit while being away from the oxygen production site, and to issue control commands to ensure the normal operation of the equipment.
