4results about How to "Reduce volume loss" patented technology

This invention belongs to the field of variable wing technology and discloses a lightweight integrated aerodynamic drive system and a deformable wing. The aerodynamic drive system includes: a double-acting cylinder integrated with the valve bodies of a normally open and normally closed electromagnetic directional valve via a cylinder head; a combined valve comprising an inflation valve and a pressure reducing valve; the inflation valve is located above the pressure reducing valve, with its valve body integrated with the pressure reducing valve's valve body, and its outlet flow channel directly connected to the pressure reducing valve's inlet flow channel; the pressure reducing valve is located on the top of the front cylinder head of the double-acting cylinder, and is connected to the normally open electromagnetic directional valve via a gas-sealed connection, directly docking with a gas cylinder. This system combines optimized gas path design and hardware integration, integrating energy and drive functions, resulting in a compact and lightweight structure. It can adapt well to the requirements of limited installation space, significantly improving the system's adaptability to various operating conditions, thereby enhancing the aircraft's flight performance.

The utility model discloses a dry shaft type submerged pump which comprises a pump body, an impeller is installed in a cavity in the pump body, a protective sleeve is connected to the periphery of the top end of the impeller, the top end of the protective sleeve extends into a cavity of an installation plate, a main force pipe is installed at the position, located on the outer side of the protective sleeve, of the bottom end of the installation plate, and a motor is installed at the top end of the installation plate. A power output shaft of the motor penetrates through the protective sleeve to be connected with the impeller, a wear-resisting ring is installed on the portion, matched with the protective sleeve, in the installation plate, and a wear-resisting ring gland is installed on the outer side of the wear-resisting ring. The utility model has the beneficial effects that the sheath and the impeller are designed into an integrated structure, and the transmission shaft of the motor is completely included in the sheath on the impeller, so that the transmission shaft of the motor is completely isolated from a conveying medium, and the problem of sealing failure at the transmission shaft of the motor is completely solved; meanwhile, the dry sealing ring can prevent the conveyed medium from volatilizing to the outside, and the pressure relief groove is formed in the pump body, so that the volume loss of the pump can be reduced, and the efficiency of the pump is improved.

The application discloses an impact-resistant and wear-resistant epoxy resin modified mortar and a preparation method thereof, and relates to the technical field of mortar.The application comprises the following raw materials in mass parts: deionized water 170-190 parts, modified boron nitride synergist 13.13-14.38 parts, water reducing agent 0.8-1.2 parts, tributyl phosphate 0.6-0.8 parts, composite modified porous polysiloxane microspheres 26.25-28.75 parts, water-based epoxy resin 21-23 parts, Portland cement 420-460 parts, sulphoaluminate cement 105-115 parts, concrete expansive agent 15.75-17.25 parts, river sand 1050-1150 parts, water-based epoxy curing agent 27.3-29.9 parts.The introduction of the modified boron nitride synergist and other raw materials in the application simultaneously improves the compressive strength, the bending strength, the impact strength, the wear resistance, the anti-cavitation ability, the aging resistance and the alkali corrosion resistance.

The utility model discloses a cold chain equipment evaporative fan centrifugal impeller, including impeller base, a plurality of impeller blades are annular equidistance and set up on the impeller base, the ring cover is set between a plurality of impeller blades, the utility model is equipped with the ring cover between a plurality of impeller blades, is set up the ring cover at centrifugal impeller open end, when the air inlet comes from the air of impeller blade end face, the wind does work through the trajectory of impeller blade, accelerates through the blade trajectory of impeller blade, and the ring cover can reduce the interference of the flow along the radial direction of impeller end face, and provide the kinetic energy of wind force, reduce the volume loss of impeller blade, thereby promote the air volume and the wind pressure of centrifugal impeller, improve the performance of cold chain equipment evaporative fan centrifugal impeller.