Control method of variable-frequency hydraulic oil pump
A technology of hydraulic oil pump and control method, applied in pump control, liquid variable capacity machinery, machine/engine, etc., can solve problems such as waste and low motor efficiency
Active Publication Date: 2010-12-15
XINXING ENERGY EQUIP
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Problems solved by technology
[0004] The object of the present invention is to provide a control method of a variable frequency hydraulic oil pump, which solves the problem that the excess hydraulic oil overflows back into the oil tank of the substation, the efficiency of the motor is low, and waste is generated; and with the development of frequency conversion technology and frequency converter It is widely used to investigate the relationship between the flow rates of the main hydraulic oil pump required by different working conditions. For the hydraulic natural gas vehicle filling sub-station, the invention can provide uniform exhaust volume within the range of changing natural gas flow rates, and improve the performance of the motor. efficiency, energy saving
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[0016] The frequency conversion type hydraulic natural gas vehicle refueling substation of the present invention includes: a substation trailer, a substation skid body, a main hydraulic oil pump, a hydraulic oil pump motor, a PLC control cabinet, a frequency conversion control cabinet, and air source equipment. The control method is as follows:
[0017] First, the PLC control cabinet processes the pressure signal of the natural gas pressure in the trailer of the substation, and calculates the instantaneous pressure of the natural gas pressure in the trailer of the substation within 1 second. Through the change rate of the instantaneous pressure value, the main hydraulic pressure of the substation The working mode of the pump is divided into four different operating ranges:
[0018] Full power operation, the rate of change of natural gas pressure in the trailer of the substation is ≥1Mpa / s. At this time, the main hydraulic pump needs to work in the rated state, that is, the mot...
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The invention relates to a control method of a variable-frequency hydraulic oil pump, belonging to the technical field of automobile gas filling stations. A variable-frequency hydraulic natural gas automobile gas secondary filling station comprises a secondary station trailer, a secondary station prying body, a main hydraulic oil pump, a hydraulic oil pump motor, a PLC (Programmable Logic Controller) control cabinet, a variable-frequency control cabinet and gas source equipment. Firstly, the PLC control cabinet processes the pressure signals of natural gas in the secondary station trailer, and the instantaneous pressure of the natural gas in the secondary station trailer within one second is obtained through calculation. Through the change rate of the instantaneous pressure value, the operating mode of the secondary station main hydraulic oil pump is divided into four different operating sections: full power operation, 4 / 5 power operation, 3 / 5 power operation and zero power operation.The invention solves the problems of low motor efficiency and waste production because of the excessive hydraulic oil overflows back to an oil tank of the secondary station; uniform gas displacement can be provided within the varying natural gas flow range, the efficiency of the motor is improved, and the electric energy is saved.
Description
technical field [0001] The invention belongs to the technical field of automobile gas filling stations, and in particular provides a control method of a variable frequency hydraulic oil pump, which changes the output flow of the hydraulic oil pump according to demand, and is suitable for controlling the main hydraulic oil pump of a hydraulic natural gas vehicle gas filling substation. Background technique [0002] Natural gas is a colorless, odorless, non-toxic, high-calorific value, stable combustion, clean and environmentally friendly high-quality energy. Compressed natural gas (CNG), as an alternative fuel for urban buses, taxis, and short-distance transportation, has many advantages such as low price and no pollution, and has been used more and more in the country. Set up a mother station at the source of natural gas, compress the natural gas to 20MPa, and then transfer it to the sub-station in the city by the trailer of the sub-station. The hydraulic sub-station for na...
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Login to View More IPC IPC(8): F04B49/06
Inventor 杨杰姚振龙王汝通韩红娟
Owner XINXING ENERGY EQUIP