2results about How to "Design calculation is simple" patented technology

The application provides a design method for a streamlined space guide vane of a multistage centrifugal pump, and belongs to the technical field of hydraulic machinery. The design method for the streamlined space guide vane of the multistage centrifugal pump directly controls the guide vane profile according to a curve equation, can adapt to various change conditions, significantly improves the guide vane design efficiency under the condition of controlling the direction of the inlet and outlet flow passages, and has extremely important role and value for improving the hydraulic performance of the space guide vane. The positive and negative guide vanes of the design method for the streamlined space guide vane of the multistage centrifugal pump are an integral streamline, have obvious optimization effect, are simple in design calculation, and are high in adaptability.

The invention discloses a terrace system for reducing settlement of a first floor building terrace, which is characterized in that the terrace system comprises a floor slab, a cushion layer, a ring beam, a constructional column, a bearing wall and a foundation beam, the floor slab is arranged at the lower part of the first floor, and the cushion layer is arranged below the floor slab; the ring beams are arranged on the periphery of the floor slab, and constructional columns are further arranged at the corners, the ends and the large-span middle position of the floor slab. The bearing wall is arranged on the lower portion of the ring beam, and a foundation beam is arranged below the bearing wall. Compared with the prior art, the rigid floor slab is arranged, the load of the rigid floor slab is directly transmitted to the pile foundation through the bearing wall and the foundation beam, and a backfill soil layer is completely bypassed. The settlement of the fill stratum has no influence on the surface of the floor (terrace), the problems of terrace settlement and cracking are fundamentally solved, the terrace system is independent, the design is simplified, and the terrace system is a self-contained system, is separated from a main body frame of a building and does not depend on the main body frame of the building. The influence on the design of the main body frame is avoided, and the design calculation of the floor structure is simplified. According to the terrace system, the ring beams and the constructional columns are arranged, so that differential settlement and temperature stress are effectively resisted, the terrace structure is higher in integrity, and the service life is longer.