110results about How to "Reduce cyclical fluctuations" patented technology

The invention discloses a single-rotor compressor rotating speed control method. The single-rotor compressor rotating speed control method comprises the process of controlling a compressor according to the real-time angular speed and moment; the process of controlling the compressor according to the real-time angular speed comprises the steps of carrying out filtering on an axis error, and obtaining the angular speed compensation amount; compensating the angular speed compensation amount into the output angular speed of a phase-locked loop adjuster, and obtaining the compensated angular speedoutput amount; according to the compensated angular speed output amount, correcting the real-time angular speed, and according to the corrected real-time angular speed, controlling the compressor; the process of controlling the compressor according to the moment comprises the steps of calculating the difference between the target angular speed fluctuation amount and the compensated angular speedoutput amount, obtaining a first angular speed difference value; carrying out filtering on the first angular speed difference value, and obtaining a filtering angular speed; inputting the filtering angular speed into a velocity loop adjuster, and obtaining output torque; and according to the output torque, controlling the compressor. The compressor rotating speed fluctuation inhibition effectiveness can be improved.

The purpose of the present invention is to provide an elbow with inner spiral fins near the wall, which is suitable for the transportation of gas-liquid two-phase fluids and fluids containing volatile media, and eliminates the change of the flow direction of the elbow and the change of the wall surface of the pipeline. The boundary layer separation and secondary eddy current caused by the uncoordinated inner and outer curvatures reduce the corrosion degree of the inner and outer walls of the elbow and improve the service life of the fluid conveying pipeline. The technical scheme adopted in the present invention is as follows: an elbow with inner spiral fins on the near wall surface, comprising an elbow body, an inlet nozzle flange and an outlet nozzle flange at both ends of the elbow body, 2 to 6 groups of Inner helical fins, the inner helical fins extend along the inner wall of the elbow pipe from the inlet to the outlet inside the elbow, the inner helical fins are variable pitch fins, and the pitch decreases first along the flow direction increasing trend later.

The invention discloses a method for controlling the rotation speed fluctuation of an air conditioner compressor, which includes the process of controlling the compressor according to the real-time angular velocity and torque; the process of controlling the compressor according to the real-time angular velocity includes: filtering the shaft error to obtain the angular velocity compensation amount; The angular velocity compensation amount obtains the compensated angular velocity output; corrects the real-time angular velocity and controls the compressor according to the compensated angular velocity output; the process of controlling the compressor according to the torque includes: calculating the difference between the target angular velocity fluctuation and the feedback angular velocity, and obtaining The first angular velocity difference; input the first angular velocity difference to the speed loop regulator to obtain the output torque; obtain the torque compensation amount according to the first angular velocity difference; obtain the compensation according to the torque compensation amount and the output torque output torque and control the compressor. By applying the present invention, the effectiveness of suppressing the fluctuation of the rotational speed of the compressor can be improved.

The invention discloses a method for controlling the rotation speed fluctuation of a single-rotor compressor, including the process of controlling the compressor according to the real-time angular velocity and torque; the process of controlling the compressor according to the real-time angular velocity includes: filtering the shaft error to obtain angular velocity compensation amount; compensate the angular velocity compensation amount to the output angular velocity of the phase-locked loop regulator to obtain the compensated angular velocity output; correct the real-time angular velocity according to the compensated angular velocity output, and control the compressor according to the corrected real-time angular velocity The process of controlling the compressor according to the torque includes: calculating the difference between the target angular velocity fluctuation and the feedback angular velocity to obtain the first angular velocity difference; filtering the first angular velocity difference to obtain the filtered angular velocity; Input to the speed loop regulator to obtain the output torque; control the compressor according to the output torque. By applying the present invention, the effectiveness of suppressing the fluctuation of the rotational speed of the compressor can be improved.

The invention discloses a method and device for controlling the rotational speed of a compressor. The method includes: obtaining an axis error reflecting the deviation between the actual position and the estimated position of the compressor rotor; filtering the axis error to obtain at least filtered The shaft error compensation amount after part of the shaft error fluctuation; the shaft error compensation amount is input to the phase-locked loop regulator in the compressor control phase-locked loop as the input amount, and the output angular velocity of the phase-locked loop regulator is obtained; The output angular velocity of the phase-locked loop regulator is input to the speed loop regulator in the compressor control speed loop as an input to obtain the output torque of the speed loop regulator; using the output of the phase-locked loop regulator The angular velocity corrects the real-time angular velocity used for compressor control, and controls the compressor according to the corrected real-time angular velocity and the output torque of the speed loop regulator. By applying the present invention, the effectiveness of suppressing the fluctuation of the rotational speed of the compressor can be improved.