4results about How to "Reduce peripheral speed" patented technology

According to the draft tube flow guide structure for the water turbine, a triangular flow guide grid is arranged at an inlet of a draft tube, a circular flow guide grid is further arranged in the triangular flow guide grid, and a plurality of flow guide plates are further evenly arranged on the inner wall of the rear half section of a straight cone section of the draft tube in the circumferential direction. According to the draft tube flow guide structure for the water turbine, the problem that in the prior art, the efficiency of a water turbine set is reduced due to increased pressure oscillation and draft tube loss caused by a vortex band is solved.

The present invention discloses a high-speed lightweight impeller and rotor, belonging to the technical field of impeller machinery. It includes a first split body and a second split body, the first split body includes a first hub, a first wheel disc and a first blade, the second split body includes a second hub, a second wheel disc and a second blade, the first wheel disc and the second wheel disc have a top end face and a bottom end face along the axial direction respectively, the radius of the top end face is smaller than the bottom end face, the top end face of the first wheel disc is consistent with the outer diameter of the bottom end face of the second wheel disc, and the first blade at the top end face of the first wheel disc is correspondingly connected with the second blade at the bottom end face of the second wheel disc. The present invention has the advantages of improving the stress concentration of the impeller, satisfying the rotor dynamics, and realizing its high-speed operation in a high-temperature environment.

A skein conveying device includes a skein conveying member (27) guided along a predetermined movement path via one end (27d) and a drive unit (50) having a drive section (56). The drive section is kinetically connected to the one end (27d) of the skein conveying member (27) in such a way that the drive section (56) engages with a first transmission member (51), which is kinetically connected to another transmission member (52) via a speed-changing transmission mechanism (53-55). The other transmission member engages either with the one end (27d) of the skein conveying member (27) or with a follower member (57) connected thereto. The drive unit (50) is designed to move the drive section (56) such that the skein conveying member (27) moves along the movement path via the one end (27d). The transmission mechanism (53-55) is designed such that the extension of the drive element (50) along the movement path by means of the transmission mechanism (53-55) is less than or equal to twice the maximum possible diameter of the sliver can for the sliver can pushing device. The sliver can changer is configured to stack the incoming fiber sliver in the spinning sliver can (6) in a predetermined shape at the filling position (20), and includes a sliver can pushing device configured to move the empty sliver can (6) from the insertion position to the filling position (20) in a predetermined direction as the sliver can pushing member (27) moves. The spinning machine (1) has such a sliver can changer.

The invention belongs to the technical field of mechanical energy storage and hydroelectric generation, and discloses a wing-shaped flow guide component for controlling the hydraulic instability of a pump turbine. The pump turbine can stably work under the working condition of turbine power generation and the working condition of water pump water pumping through the wing-shaped flow guide component installed in the draft tube, and spiral vortex strips and pressure pulsation in the draft tube are relieved. The wing-shaped flow guide component in the middle of the straight cone section of the draft tube is connected with the wall face of the draft tube through an anchor chain. The spiral vortex strip enters the flow guide component, firstly, the vortex strip cannot move in the radial direction due to limitation of the wall face, the vortex strip is broken into a large number of small vortex structures after impacting the wall face, secondly, the device separates a dead water area from a main flow area, the vortex strip cannot obtain speed compensation of the main flow area, and therefore the circumferential speed is reduced, and the eccentric distance is reduced. The method can relieve the hydraulic instability of the pump turbine in the power generation working condition and the water pumping working condition at the same time.