Common fault repair and maintenance of oil-free air compressors:

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The air compressor keeps running, but the air supply is still insufficient. The compressor operates until the air tank reaches a certain pressure level, after which it stops. Use your ear to check the various external pipes of the air compressor, as well as the connections on the air supply pipe leading to the air tank, including one-way valves, safety valves, pressure switches, etc., to see if there are any signs of air leakage. If the above issues are ruled out, it could be wear and tear on the machine’s bowl, or one air compressor powering multiple treatment tables. It’s overloaded. As for a damaged rubber gasket, it needs to be replaced; the typical lifespan of such gaskets is around 3 years. The air compressor operates intermittently, resulting in insufficient air supply. The cause of this fault is: insufficient voltage at A. There is a buzzing sound when it starts up. If it is observed that the operating current at this time is greater than 5 amps, (the normal operating currents for common 520-watt and 840-watt oil-free dental air compressors are 2.8A and 3.8A respectively). The minimum operating voltage for the oil-free head is 198V; below this voltage, it is difficult to start the head, and frequent starting will cause the head’s temperature to rise. Ultimately, the circuit protection shuts down the system. Turn it on again once the temperature drops. It is recommended to buy a small voltmeter and install it at the power source for easy monitoring. (A small voltmeter costs only 5 yuan each.) ) Install an automatic voltage stabilizer in case of low voltage issues. B start capacitor is leaking. When there is capacitance leakage, the compressor head can still start up, but the speed is reduced and the current increases. Due to this higher current, the head heats up rapidly, and it stops operating as a result of protection mechanisms. For this issue, just use a new one, but make sure the UF value is the same; either too high or too low is not good. Every time the air compressor operates, it must reduce the pressure in the air tank to zero before it can start working. Otherwise, it cannot be started; when powered on, the head rotates very slowly and there is a humming sound. The current is also high. This is because a component called a check valve has been clogged with dirt; it is connected at one end to the exhaust pipe of the machine (or the high-pressure pipe) and at the other end to the air tank. It is usually made of copper; some manufacturers use iron for it, and it has three outlets. Its function is to ensure that the gas emitted by the nozzle flows only into the gas cylinder, while preventing the gas from the cylinder from escaping; it contains a spring and a rubber strip inside. If dirt gets stuck in the film, it causes reverse air leakage, and attempting to restart the machine will result in high pressure preventing it from starting. The solution is to use a wrench to open the valve cover behind the check valve, clean it, and then reinstall it as it was. ＜4＞The air compressor can operate, but the noise level is significantly higher than before. For this phenomenon, after checking whether the components on the machine are loose, verify whether the operating current is normal. Under normal circumstances, this is usually due to the machine having been in use for some time. An oil-free air compressor should be placed in an environment free from dust; regularly unplug it and use high-pressure air to blow away the dust from its surface as well as from the blades at both ends. Excessive noise is caused by the dust wearing down the bearings of the four motors – the Guangshun factory, which sells the largest quantity of such compressors in China, uses Japanese NSK bearings of good quality – and the rubber seals are also affected as a result. Tools and accessories that require replacement use specialized oil-free air compressors.