Shutdown braking system and method for screw pump
A technology of stop braking and screw pump, applied in pump control, machine/engine, mechanical equipment, etc., can solve the problems of difficult screw energy storage and complex structure, and achieve the effect of reducing system cost and improving reliability.
Active Publication Date: 2014-12-24
SUZHOU INOVANCE TECH CO LTD
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Problems solved by technology
[0008] The technical problem to be solved by the present invention is to provide a braking system and method for shutting down the screw pump in view of the problems of complex structure and difficult release of screw energy storage in the above screw pump braking method
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Embodiment Construction
[0025] The invention relies on the motor driver to control the actual output torque of the motor, so that the common frequency converter or the hardware platform of the servo driver can brake the screw pump and gradually release the mechanical energy stored in the screw.
[0026] Such as figure 2 Shown is a schematic diagram of an embodiment of the screw pump shutdown braking system of the present invention. In this embodiment, the screw pump is driven to rotate by a motor, and the braking system includes a motor drive unit 21 , a motor speed detection unit 23 and a control unit 22 . The braking system can be realized on the hardware platform of common frequency converter or servo drive, wherein the control unit 22 can be the main control CPU of the frequency converter or servo drive.
[0027] The motor drive unit 21 is used to output torque to the motor, so as to control the operation of the motor. The motor detection unit 23 is used to detect the motor speed in real time....
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The invention relates to a shutdown braking system of a screw pump. The screw pump is operated under the drive of a motor and comprises a motor driving unit, a motor rotation speed detecting unit and a controlling unit, wherein the motor driving unit is used for outputting torque to the motor; the motor rotation speed detecting unit is used for detecting the rotation speed of the motor in real time; and the controlling unit is used for setting the output torque of the motor driving unit to be a minimum value when a shutdown command is received and the rotation speed of the motor is decreased to a first threshold value, as well as regulating the output torque of the motor driving unit to increase the output torque along with the increase of the reverse rotation speed and decrease the output torque along with the decrease of the reverse rotation speed when the motor is dragged by a screw rod to rotate reversely and has the rotation speed reaching a second threshold value. The invention further provides a corresponding shutdown braking method of the screw pump. According to the invention, the braking of the screw pump is realized through controlling the output torque, so that the system cost is obviously reduced, meanwhile, the reliability of the braking is increased.
Description
technical field [0001] The invention relates to the field of screw pump control, and more specifically, relates to a stopping braking system and method of a screw pump. Background technique [0002] The direct-drive screw pump oil production technology can meet the requirements of different working conditions of the oil well, not only can achieve the effect of high efficiency and energy saving, but also can effectively prevent mechanical accidents such as pump rod breakage, increase the working time of oil production, and reduce the labor intensity of workers. [0003] Because the screw is very long and the mechanical energy storage is large, if the motor cannot be braked when the machine is stopped or the system fails, it is easy to cause the motor to be dragged and reversed at a high speed. At present, the braking methods of screw pumps are: (1) fixed torque mechanical braking; (2) adjustable torque mechanical braking; (3) resistor series braking. [0004] When the fixed ...
Claims
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IPC IPC(8): F04C14/06
Inventor 陈小猛
Owner SUZHOU INOVANCE TECH CO LTD