Power generating lying energy recycling electric hydraulic pressure energy-saving balance beam type pumping machine

Abstract

An electro-hydraulic energy-saving beam type oil pump for reusing the energy under the condition of power generation is provided, which comprises a frame, a drive, a beam, a polish rod, a pre-drive head and an auxiliary hydraulic energy regenerator comprising a hydraulic system and an electric control unit. The hydraulic system comprises an auxiliary supporting truss, a hydraulic pump, a hydraulic cylinder, an accumulator, a hydraulic integration block, an auxiliary hydraulic oil tank and a movably contacting mechanism that is located on the beam and transmits the displacement of the beam to the piston rod of the hydraulic cylinder; the movably contacting mechanism is connected respectively with the piston rod and the auxiliary supporting truss; on the platform of the auxiliary supporting truss, the hydraulic cylinder and the accumulator are arranged parallelly; the hydraulic cylinder is connected with the accumulator through the hydraulic integration block; the base of the auxiliary supporting truss is connected with the hydraulic pump, which is respectively connected with the auxiliary oil tank and the hydraulic integration block. For the invention, the drive motor of the oil pump can be standby in a negative-power area and can recycle and reuse the residual energy of the negative power, so as to save power and energy without changing the structure and operation principle of the former beam type oil pump.

Description

technical field [0001] The invention relates to a beam pumping unit, in particular to an electro-hydraulic energy-saving beam pumping unit in which energy in a power generation state is reused. Background technique [0002] The beam pumping unit is currently a commonly used model in my country's oilfields. Due to the fluctuation of its load, the driven motor often works in a light-load state, and most of the motors still have the phenomenon of reverse power generation. low efficiency. The article "Development and Application of Intermittent Power Supply Device for Beam Pumping Units" (Petroleum Machinery, Volume 34, No. 5, 2006) describes the intermittent method of the motor of the pumping unit, but does not recover the intermittent mechanical residual energy . "The Design Principle of Power Recovery Type Hydraulic Pumping Unit" (Petroleum Machinery, Volume 23, No. 2, 1995) proposed the concept of power recovery, but it was limited to the beamless pumping unit. In Chinese ...

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Problems solved by technology

In Chinese Patent No. ZL94202553.9, it is described that the variable pump-motor drive is used in the hydraulic pumping unit to solve the problem of balance and power recovery. It will produce the self-consumption effect of the equipment, and at the same time affect the normal operation of the original pumping unit

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