5 results about "Reverse effect" patented technology

The shield tunneling machine dual-slurry injection anti-reverse structure provided by this invention includes a diversion block fixed inside the rear shield shell plate. The diversion block has a flow channel connecting liquid hole A and liquid pipe B. By making the flow channel pass through both ends of the diversion block along its length, the flow channel includes coaxially arranged inlet and outlet sections, as well as multiple annular flow channels connected in series between the inlet and outlet sections. Each annular flow channel includes an inclined section and a semi-annular section bypassing both ends of the inclined section. The inclined sections of adjacent annular flow channels have opposite inclination directions, and the semi-annular sections of adjacent annular flow channels are located on both sides of the axis of the inlet section, making the semi-annular sections teardrop-shaped. This allows the flow channel to form a Tesla flow channel with anti-reverse function, thus taking into account both diversion and anti-reverse functions. The structure is simple, has low manufacturing cost, high structural strength, can resist the impact of propulsion cylinder support shoes, is easy to disassemble and assemble, and has stronger buffering effect of anti-reverse effect, which can reduce the probability of blockage. After blockage, multiple methods can be used to clear it, and the handling flexibility is better.

The present invention discloses a piezoelectric forward and reverse effect coupled power amplification device for a wind turbine blade. The device comprises an upper flexible piezoelectric material, a lower flexible piezoelectric material, a housing, a converter, an energy storage device, and a controller. The lower flexible piezoelectric material is mounted on the lower portion of the housing, which is fixed to the wind turbine blade. The strain energy generated by the wind turbine blade drives the deformation of the lower flexible piezoelectric material, thereby causing the lower flexible piezoelectric material to generate a current signal. This current signal is stored in the energy storage device after passing through the converter. At the same time, the controller detects the current signal and, when the current signal strength meets a predetermined value, controls the energy storage device to energize the upper flexible piezoelectric material. This causes the upper flexible piezoelectric material to deform through the reverse piezoelectric effect, disturbing the flow field outside the boundary layer of the wind turbine blade and suppressing boundary layer separation. The present invention can effectively improve the aerodynamic efficiency of the wind turbine blade root while being safe and reliable, having a simple structure, and being easy for construction personnel to operate.

The invention discloses an anti-backflow infusion device for intravenous therapy, and relates to the technical field of intravenous therapy. A connecting assembly is arranged at the bottom of the body assembly, a guiding assembly is arranged at the bottom of the connecting assembly, a first anti-reverse assembly is arranged in the guiding assembly, a medicine adding assembly is arranged on the side face of the body assembly, and a mounting assembly is arranged at one end of the medicine adding assembly. A second anti-reversing assembly is arranged in the mounting assembly; the body assembly comprises an infusion tube, a bottle plug puncture needle and an injection needle, the first anti-reverse assembly is arranged close to the bottle plug puncture needle, liquid medicine in the infusion tube is prevented from flowing back into a bottle to pollute the bottle, the second anti-reverse assembly is installed at the position close to the injection needle, stable and timely flow blocking is carried out during backflow, and the anti-reverse effect is achieved. And unpowered flow choking is arranged, so that the cost is lower while stable backflow prevention is guaranteed, the poor backflow prevention effect caused by shaking and other external factors is avoided, and the backflow prevention process can be more stable.

The application discloses a kind of with anti-reverse H bridge drive circuit, including power supply positive pole VDD and power supply negative pole GND, anti-reverse, control level conversion and dead zone control circuit, transistor NM5 and H bridge drive circuit, power supply positive pole VDD directly to anti-reverse, control level conversion and dead zone control circuit power supply, and it is powered to H bridge drive circuit by the transistor NM5 of anti-reverse effect, can prevent power voltage reverse connection, avoid reverse connection misoperation burn chip, while anti-reverse circuit is realized using N type MOS tube, compared with P type MOS tube realization has smaller on-resistance, also saves chip area.

The utility model relates to a kind of anti-reverse impeller, including impeller connecting part, flow limiting panel and more than one arc-shaped guiding water leaf panel. Impeller connecting part has mounting hole, can be installed on arbitrary shaft;Flow limiting panel is set on impeller connecting part;Arc-shaped guiding water leaf panel is vertically installed on flow limiting panel, and it is circumferentially distributed. Flow limiting panel is respectively provided with notch on the two sides of each arc-shaped guiding water leaf panel, to improve the elasticity of flow limiting panel. Compared with prior art, the utility model optimizes notch position, retains the connecting structure of the bottom of guide vane, improves the overall strength and impact resistance of guide vane, thereby improves anti-reverse effect and service life.