Patents by Inventor Zhengzhong Lei

Zhengzhong Lei has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Power unit of hydraulic pumping unit and corresponding hydraulic pumping unit
    Patent number: 10260497
    Abstract: Disclosed is a power unit of a hydraulic pumping unit, which comprises a motor; a pumping rod driving device for driving reciprocating movement of a pumping rod; a variable pump driven by the motor, the variable pump hydraulically connected to the pumping rod driving device; a secondary hydraulic control unit hydraulically connected to the pumping rod driving device; an energy accumulator being in transmission connection with the secondary hydraulic control unit; a sensor for setting a stroke of the pumping rod; a first control device adapted to, based on the signals from the sensor, set the discharge capacity of the variable pump to be zero during the declining process of the pumping rod and to be positive during the ascending process of the pumping rod to drive the pumping rod driving device; and a second control device adapted to based on the signals from the sensor, set the secondary hydraulic control unit to function as a motor for driving the energy accumulator to accumulate energy during the descending
    Type: Grant
    Filed: May 8, 2014
    Date of Patent: April 16, 2019
    Assignee: Robert Bosch GmbH
    Inventors: Zhengzhong Lei, Pei Sun, Yongbo Chen
  • Power Unit of Hydraulic Pumping Unit and Corresponding Hydraulic Pumping Unit
    Publication number: 20160131130
    Abstract: Disclosed is a power unit of a hydraulic pumping unit, which comprises a motor; a pumping rod driving device for driving reciprocating movement of a pumping rod; a variable pump driven by the motor, the variable pump hydraulically connected to the pumping rod driving device; a secondary hydraulic control unit hydraulically connected to the pumping rod driving device; an energy accumulator being in transmission connection with the secondary hydraulic control unit; a sensor for setting a stroke of the pumping rod; a first control device adapted to, based on the signals from the sensor, set the discharge capacity of the variable pump to be zero during the declining process of the pumping rod and to be positive during the ascending process of the pumping rod to drive the pumping rod driving device; and a second control device adapted to based on the signals from the sensor, set the secondary hydraulic control unit to function as a motor for driving the energy accumulator to accumulate energy during the descending
    Type: Application
    Filed: May 8, 2014
    Publication date: May 12, 2016
    Inventors: Zhengzhong Lei, Pei Sun, Yongbo Chen