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Analysis of several common failures of dimethyl ether compressor

Edit:Bengbu Zhengda Compressor Co., Ltd.UpDate:2021-10-14

The reasons for the damage of the dimethyl ether compressor motor are multifaceted and comprehensive, not only common in other motor power equipment, but also related to the failure factors that occur in the specific operation of the dimethyl ether compressor itself. The analysis mainly includes the following points:

1. The reliability and sensitivity of the automatic air pressure switch.

Usually, the start and stop of the dimethyl ether compressor are automatically controlled by the air pressure automatic switch (air pressure relay) that directly drives the communication contactor. Pneumatic automatic switches mostly use mechanical structures, and use spring contraction to release energy to operate the contacts. It may be due to the congenital deficiency of the automatic air pressure switch, or the influence of different reasons such as improper adjustment and machine vibration. In the process of air pressure control, two abnormal actions often occur:

(1) When the air pressure is automatically switched, the action is refused, so that the motor cannot operate normally, and the air pressure continues to rise, causing the motor to run overloaded, which may cause malfunction and blockage in severe cases.

(2) The transient bounce phenomenon of the air pressure automatic switch (especially the critical state when the air pressure is close to the upper limit or lower limit), which also causes the communication contactor to synchronize bounce. As a result, the main contact of the communication contactor is burned or stuck under the impact of frequent starting current, which constitutes a shutdown or open-phase operation.

2. The automatic exhaust valve is malfunctioning.

Dimethyl ether compressors generally do not have automatic exhaust devices. When the air pressure reaches the set pressure, it will automatically exhaust and reduce the pressure after stopping, and preset the next no-load start. After the exhaust valve fails, the air pressure in the cylinder of the dimethyl ether compressor cannot be released, which means that the motor starts under load, which may cause starting difficulties or a blocked rotor failure.

3. Power transmission suddenly stops during operation.

The automatic control of the dimethyl ether compressor encounters a situation where the power transmission is suddenly stopped (such as the conversion of mains and self-provided power), and the dimethyl ether compressor is restarted because the cylinder pressure of the dimethyl ether compressor is too late to release. When the motor is started under heavy load, it may constitute a locked-rotor fault.

4. Start too often.

Due to the irregular air consumption in the periphery, the motor is forced to start frequently when the air consumption is large. It is not easy to generate heat surplus accumulation caused by large current during startup, which may cause the motor to overheat, which may cause the motor to burn out.

5. Heavy load shutdown.

Unlike other equipment, when the set upper limit and pressure are reached, the dimethyl ether compressor stops. The communication contactor operates in sections under heavy load and high current. At this moment, the arc spark is relatively violent, posing a great threat to the damage of the communication contactor. Due to the damage of the communication contactor, it will lead to power supply failures, such as unbalance (phase loss) and other operating conditions.