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The advantages of gear pumps and operating precautions

2020-09-15

The advantages of gear pumps and operating precautions:
advantage:
Compared with centrifugal pumps that use mechanical seals or packing seals, gear pumps have the following advantages.
1. The pump shaft changes from a dynamic seal to a closed static seal, completely avoiding medium leakage.
2. There is no need for independent lubrication and cooling water, which reduces energy consumption.
3. From coupling transmission to synchronous drag, there is no contact and friction. It has low power consumption, high efficiency, and has a damping and vibration reduction effect, which reduces the impact of motor vibration on the pump and the impact on the motor when the pump occurs cavitation vibration.
4. When overloaded, the inner and outer magnetic rotors will slip relatively, which will protect the motor and pump.
Precautions:
1. Prevent particles from entering
(1) Ferromagnetic impurities and particles are not allowed to enter the magnetic drive and bearing friction pairs.
(2) After transporting the medium that is easy to crystallize or precipitate, flush it in time (pour clean water into the pump cavity after stopping the pump, and drain it after 1 minute of operation) to ensure the service life of the sliding bearing.
(3) When transporting media containing solid particles, filter at the inlet of the pump flow pipe.
2. Prevent demagnetization
(1) The magnetic torque cannot be designed too small.
(2) It should be operated under the specified temperature conditions, and the medium temperature is strictly prohibited from exceeding the standard. A platinum resistance temperature sensor can be installed on the outer surface of the gear pump isolating sleeve to detect the temperature rise in the annulus area, so as to alarm or shut down when the temperature exceeds the limit.
3. Prevent dry friction
(1) Idling is strictly prohibited.
(2) It is strictly forbidden to evacuate the medium.
(3) When the outlet valve is closed, the continuous operation time of the pump shall not exceed 2 minutes to prevent the magnetic actuator from overheating and failing.
Gear pumps are used in key dangerous areas of multiple installations in refineries and ethylene plants with good results.

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