Oil-free air compressor common fault repair and maintenance

The air compressor keeps working, but the air supply is still insufficient. The air compressor works to stop the gas tank when there is a little pressure. Listen to the external pipes of the air compressor, the air supply pipe of the air compressor on the air tank, and the one-way valve. Safety valve, pressure switch and other joints are leaking sound.

If the above problems are eliminated, it may be that the head cup is worn or one air compressor has multiple treatment tables. It's overloaded. As for the damage of the leather bowl, you have to change the leather bowl. Generally, the life of the leather bowl is about 3 years.

The air compressor works intermittently and the air supply is insufficient. The cause of this failure is:

A voltage is insufficient. There is a buzzing sound at the start. If the operating current is greater than 5 A at this time, (the normal operating currents of the common 520W and 840W oil-free air compressor heads are 2.8A and 3.8A respectively). The minimum working voltage of the oil-free head is 198V, below which the head is difficult to start, and frequent starting will cause the head temperature to rise. Final circuit protection shutdown. Until the temperature drops and turns on again. It is recommended to buy a small voltmeter installed at the power supply to facilitate monitoring. (small voltmeter only 5 yuan a.) If the problem of low voltage is equipped with automatic voltage regulator.

B start capacitor leakage. When the capacitor leaks, the compressor head can still be started, but the speed is slow and the current is large. Due to the large current, the head heats up quickly, and the head will be protected and shut down soon. This problem can be replaced by a new one, but it should be noted that UF numbers should be the same, too large or too small is not good.

Every time the air compressor works, the air pressure of the gas cylinder must be set to zero pressure before starting the work. Otherwise, it cannot be started. When the power is turned on, you can see that the nose is turning very slowly and there is a buzzing sound. The current is also large. This is because a fitting called a one-way valve is stuck with dirty things, and one end of it is connected to the head outlet pipe (or high-pressure pipe) and the other end is connected to the gas cylinder.

It is generally a copper piece, some factories have iron pieces, there are three exports. Its function is to make the gas from the nose can only enter the gas cylinder but the gas from the gas cylinder cannot come out. Inside it is a spring and a film. If dirt sticks to the film, it will cause reverse air leakage, then the second start of the machine head will be pressed by high pressure and unable to start.

The solution is to use the wrench to open the valve cover behind the one-way valve, please wash it back as it is.

The air compressor can work, but the noise is obviously larger than the original. This phenomenon is to check whether the running current is normal after eliminating whether the accessories on the machine are loose.

If it is normal, the machine has been in use for some years. The oil-free air compressor should be placed in a dusty place as far as possible. After regularly unplugging the power supply, high-pressure air should be used to blow off the dust on the surface and in the two fan blades. Excessive noise is due to the wear of the four motor bearings by dust, and the corresponding leather bowls (Shanghai granklin group, which has the largest sales volume of water-lubricated air compressor in China) will also be affected. Replace tools and accessories that require a dedicated oil-free air compressor.

On the oil-free air compressor common failure causes and solutions to do a summary:

1. oil free air compressor current is too high:

the common causes of this failure are mainly the following:

1. The host fails.

2, the exhaust pressure is too high.

3. The voltage is too low: Generally, the power of the oil-free air compressor is rated. Therefore, according to the formula, too low voltage will definitely lead to too high current. This is well understood.

2. oil-free air compressor keeps working, but the gas supply is still insufficient:

common causes of this failure are:

1. Air leakage: The judgment method is to listen to the external pipes of the air compressor, the air supply pipe of the air compressor on the air storage tank, the one-way valve, safety valve, pressure switch and other joints for air leakage. If so, it must be dealt.

2, the head of the leather bowl wear: the service life of the general leather bowl is about 3 years, overdue must be replaced.

3, more than the rated flow.

4, the machine overload work.

3. oil-free air compressor works intermittently and the air supply is insufficient:

the causes of this failure are:

question

1. Start capacitor leakage. When leakage occurs, the compressor head can still be started, but the speed is slow and the current is large. Due to the large current, the head heats up quickly, and the head will be protected and shut down soon. This can be replaced by a new one, but it should be noted that the UF number should be the same, too large or too small is not good.

2. Insufficient voltage. There is a buzzing sound at the start. If the operating current is too large at this time. The minimum working voltage of the oil-free head is 200V, below which the head is difficult to start, and frequent starting will cause the head temperature to rise. Final circuit protection shutdown. Until the temperature drops and turns on again. For areas with frequent voltage fluctuations, it is recommended to install an automatic voltage regulator.