Patents by Inventor Hengli Cong

Hengli Cong 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).

  • Surface motor direct-drive sucker-rod screw pump device
    Patent number: 9059606
    Abstract: A surface motor direct-drive sucker-rod screw pump device is driven by a vertical three-phase permanent magnet brush-less DC motor, and comprises a motor controller (6), a rectifying circuit, an inversion circuit, a CPU and a driving circuit. The motor controller (6) is used to adjust the voltage and frequency of the motor by the rectifying circuit, the inversion circuit, the CPU and the driving circuit. Thus, the speed of the motor can vary from zero to the maximum. The device is easy to operate and has a higher efficiency.
    Type: Grant
    Filed: March 7, 2014
    Date of Patent: June 16, 2015
    Assignee: Millennium Oiflow Systems & Technology Inc.
    Inventors: Jun Liu, Songbo Gou, Yongjian Tang, Hengli Cong
  • SURFACE MOTOR DIRECT-DRIVE SUCKER-ROD SCREW PUMP DEVICE
    Publication number: 20140197767
    Abstract: A surface motor direct-drive sucker-rod screw pump device is driven by a vertical three-phase permanent magnet brush-less DC motor, and comprises a motor controller (6), a rectifying circuit, an inversion circuit, a CPU and a driving circuit. The motor controller (6) is used to adjust the voltage and frequency of the motor by the rectifying circuit, the inversion circuit, the CPU and the driving circuit. Thus, the speed of the motor can vary from zero to the maximum. The device is easy to operate and has a higher efficiency.
    Type: Application
    Filed: March 7, 2014
    Publication date: July 17, 2014
    Applicant: Millennium Oilflow Systems & Technology Inc.
    Inventors: Jun Liu, Songbo Gou, Youngjian Tang, Hengli Cong
  • Surface motor direct-drive sucker-rod screw pump device
    Patent number: 8702400
    Abstract: A surface motor direct-drive sucker-rod screw pump device is driven by a vertical three-phase permanent magnet brush-less DC motor, and comprises a motor controller (6), a rectifying circuit, an inversion circuit, a CPU and a driving circuit. The motor controller (6) is used to adjust the voltage and frequency of the motor by the rectifying circuit, the inversion circuit, the CPU and the driving circuit. Thus, the speed of the motor can vary from zero to the maximum. The device is easy to operate and has a higher efficiency.
    Type: Grant
    Filed: August 4, 2006
    Date of Patent: April 22, 2014
    Assignee: Millennium Oilflow Systems & Technology Inc.
    Inventors: Jun Liu, Songbo Gou, Yongjian Tang, Hengli Cong
  • Braking controller of a three-phase permanent magnetic brushless DC motor for directly driving a screw pump
    Patent number: 8283879
    Abstract: A braking controller of a three-phase permanent magnetic brushless DC motor for directly driving a screw pump includes a detection circuit for detecting power supply states of the three-phase permanent magnetic brushless DC motor and a braking circuit for controlling the braking startup according to the power supply states of the three-phase permanent magnetic brushless DC motor. When the motor is supplied with power, the braking circuit is cut off. When the motor is not supplied with power and the screw pump drives the motor to reverse, the braking circuit starts up.
    Type: Grant
    Filed: August 4, 2006
    Date of Patent: October 9, 2012
    Assignee: Millennium Oilflow systems & Technology Inc.
    Inventors: Jun Liu, Yongjian Tang, Hengli Cong
  • Braking Controller of a Three-Phase Permanent Magnetic Brushless DC Motor for Directly Driving a Screw Pump
    Publication number: 20100166572
    Abstract: A braking controller of a three-phase permanent magnetic brushless DC motor for directly driving a screw pump includes a detection circuit for detecting power supply states of the three-phase permanent magnetic brushless DC motor and a braking circuit for controlling the braking startup according to the power supply states of the three-phase permanent magnetic brushless DC motor. When the motor is supplied with power, the braking circuit is cut off. When the motor is not supplied with power and the screw pump drives the motor to reverse, the braking circuit starts up.
    Type: Application
    Filed: August 4, 2006
    Publication date: July 1, 2010
    Inventors: Jun Liu, Yongjian Tang, Hengli Cong