Energy-saving oil-immersed pump and energy-saving control method thereof

Abstract

The invention relates to an energy-saving oil-immersed pump and an energy-saving control method thereof. The energy-saving oil-immersed pump comprises a group of interface devices, wherein the interface devices are communicated with oil ways of oil guns, a processing unit of a control circuit of the oil-immersed pump is connected to the control end of a direct-current brushless motor through an optical-coupler isolation circuit and an MOS tube driving circuit or an IGBT driving circuit, multiple switching volume sensors for detecting the states of the oil guns are connected to the processing unit, a position sensor installed on a rotor shaft of the direct-current brushless motor is connected to the processing unit, and the processing unit obtains the number of the oil guns in the working state at present through the switching volume sensors. The processing unit controls the rotating speeds of the direct-current brushless motor through the MOS tube driving circuit or the IGBT driving circuit according to the number of the oil guns. The energy-saving oil-immersed pump and the energy-saving control method have the advantages of being good in energy saving effect.

Description

technical field [0001] The invention relates to an energy-saving submersible pump and a control method thereof, in particular to an oiler in the form of a submersible oil pump using a DC brushless motor as a power source and an energy-saving control method thereof, belonging to the technical field of oiler machines. Background technique [0002] At present, conventional submersible pumps use an AC asynchronous motor to drive the oil pump for oil pumping operations. When the AC asynchronous motor is used, there are only two states: start and stop, which means that when the operator lifts the gun, the AC asynchronous motor That is to say, the power operation is started, and the pumped oil has not been filled into the vehicle, and it flows back through the overflow channel, wasting a lot of electric energy; and, when this method is applied to multiple fueling guns, whether it is a fueling gun Action, or multiple refueling guns operate at the same time, the AC asynchronous motor...

AI Technical Summary

Problems solved by technology

[0002] At present, conventional submersible pumps use an AC asynchronous motor to drive the oil pump for oil pumping operations. When the AC asynchronous motor is used, there are only two states: start and stop, which means that when the operator lifts the gun, the AC asynchronous motor That is to say, the power operation is started, and the pumped oil has not been filled into the vehicle, and it flows back through the overflow channel, wasting a lot of electric energy; and, when this method is applied to multiple fueling guns, whether it is a fueling gun Action, or multiple refueling guns operate at the same time, the AC asynchronous motor operates at full power, lacks the corresponding power adjustment capability, and wastes a lot of electric energy during the entire refueling process;

[0003] At the same time, the conventional AC asynchronous motor needs to process the cooling flow channel for the rotor shaft (submersible pump working form), and use oil to cool it, but the electromagnetic force generated by the conventional AC asynchronous motor will affect the iron filings and other metals in the oil. Impurities are adsorbed, causing them to settle in the cooling channel, which affects the service life of the AC asynchronous motor;

[0004] Moreover, since the power of the AC asynchronous motor cannot be adjusted, it is impossible to select an AC asynchronous motor with matching power according to the local conditions (such as oil pressure, volume, number of refueling guns, etc.) during installation. For this reason, it is necessary for submersible pump manufacturers The production of submersible pumps of various specifications increases capital and inventory pressure; for oil sales companies, it also increases the cost of use and installation and commissioning;

[0005] In addition: the conventional AC asynchronous motor only has two states of start and stop. When the oil gun is frequently operated, there is no corresponding protection for the overcurrent state generated by the frequent start and stop of the AC asynchronous motor. Not only is it easy to damage the AC asynchronous motor, but also have certain security risks;

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