Fault diagnosis of miniature electric self-priming pump
1. Introduction
Miniature electric self-priming pump is a kind of self-priming centrifugal pump with oil-filled motor. It is composed of water pump and motor. It can carry out self-priming water absorption action in a short time, which is widely used in household water supply, building water supply, garden irrigation and other places. This article mainly introduces the common faults and maintenance of miniature electric self-priming pumps.
2. Common faults and troubleshooting
2.1 abnormal sound
When the mini electric self-priming pump is abnormal in action, if there is the abnormal sound, generally the following causes can be checked first:
(1) the reducer or motor bearing damage or loose;
(2) The connecting bolt of pump casing is loose;
(3) The metal foreign matter intrusion pump internal;
(4) The external thread of the pipe is blocked.
Troubleshooting method: (1) Replace damaged parts such as reducer and motor bearing; (2) Increase the connecting bolts of the pump casing; (3) Remove the metal foreign body; (4) Clean the external thread of the pipe.
2.2 Insufficient speed and low power
Insufficient speed and low power usually occur due to the following problems:
(1) Malfunction of the motor winding;
(2) Improper wattage / voltage;
(3) Poor contact of the motor terminal;
(4) The position of the power switch is incorrect.
Troubleshooting method: (1) Check and repair the motor winding; (2) Restore the appropriate wattage / voltage; (3) Confirm and connect the motor terminal; (4) Set the power switch to the required position.
2.3 Unstable outlet pressure
Unstable outlet pressure is often caused by the following conditions:
(1) The pump is stuck;
(2) The shutting valve is not flexible;
(3) Inlet pressure is too low.
Troubleshooting method: (1) Clear the opening part of the pump; (2) Replace or maintain the shut-off valve; (3) Increase the pressure of the inlet.
3. Maintenance
3.1 The abnormal sound phenomenon should be eliminated in the production and maintenance process. When replacing parts, the reducer, Motor bearing, etc. must be replaced with qualified parts. The connecting bolt of the pump casing must be tightened firmly.
3.2 When replacing the motor winding, pay attention to the design parameters such as wattage / voltage, and confirm the contact of the motor terminal.
3.3 It should be noted that the power switch should be set in the appropriate position during installation, or the wrong position may cause the motor to start in a rush, which will reduce the motor life.
3.4 Regularly check and clean the inlet, shut-off valve and external thread of pipe, or the blockage can cause unstable pressure and leakage.
4 Conclusion
Above is about the common fault status and maintenance of miniature electric self-priming pump. It is hoped that this article can give people some references when they encounter similar failures. At the same time, quantitative monitoring of voltage and current should be carried out in the actual operation, in order to better understand the working condition of the mini electric self-priming pump, and to prevent failure in advance.
