Alloy steel inertia energy storage flywheel with large variable cross-section keyless connection

Abstract

The invention relates to a large alloy steel inertial energy storage flywheel with variable cross-section and keyless connection, including a flywheel and a mandrel. The flywheel is an axisymmetric alloy steel flywheel. The left and right sides of the symmetrical axis are H-shaped sections. The radius of the inner lower cylindrical hole is significantly smaller than the radius of the upper cylindrical hole. The left and right sides of the hub are spokes and rims from the inside to the outside; the mandrel is a stepped shaft, which is the first round shaft, the second round shaft, The third round shaft and the fourth round shaft, and the radii decrease in turn; the flywheel and the mandrel are vertical shafts, which are matched by a keyless connection. The first round shaft is partially interference fit with the upper cylindrical hole of the flywheel, and the third The circular shaft and the lower cylindrical hole of the flywheel are partially interference fit, the flywheel and the mandrel are axially connected by bolts, and the torque is transmitted by cylindrical pins. The outer diameter of the energy storage flywheel of the invention is 1000-2000mm, the rated speed is 2400-4800r / min, and the energy storage is 20-160MJ.

Description

technical field [0001] The invention belongs to the technical field of energy storage flywheels, in particular to an alloy steel inertial energy storage flywheel with large variable cross-section and keyless connection. Background technique [0002] Flywheel energy storage technology is a new long-life energy storage technology that can be quickly charged and discharged. The basic principle of flywheel energy storage is to first convert electrical energy into mechanical energy of a rotating object, and then store energy. It uses the motor to drive the flywheel to increase or decrease speed. In the energy storage stage, the flywheel is driven by the motor to accelerate the flywheel body to a certain speed, and the electric energy is converted into mechanical energy; in the energy release stage, the motor acts as a generator to decelerate the flywheel , to convert mechanical energy into electrical energy, especially suitable for peak regulation of independent power systems tha...

AI Technical Summary

Problems solved by technology

In industrial applications, alloy steel flywheels (200-300m / s) and fiber reinforced composite flywheels (500-600m / s) are practical. Metal flywheels have high density, small size, heavy weight, stable performance, low cost, and Constrained by material strength and density, metal flywheels are difficult to achieve high energy storage density; composite flywheels are light in weight, but expensive; glass fiber and carbon fiber have been widely used in the manufacture of flywheel rotors; however, fiber-wound composite flywheels are Anisotropic, the hoop direction is consistent with the fiber direction, so the strength is very high, which can reach more than 1000MPa; while the radial (transverse direction perpendicular to the fiber direction) strength is mainly provided by the epoxy resin and fiber / resin interface, usually lower than 100MPa, so encountered the problem of radial delamination

[0005] In addition, the solid connection between the alloy steel flywheel and the motor shaft is an important issue in the design of the flywheel motor shaft system. The design of the sleeve structure between the wheel disc and the shaft of general rotating machinery is not suitable because the inner cylindrical surface of the flywheel rotates at high speed. Large deformation will cause loosening between the wheel and the shaft. If a key connection is used, the high stress level at the keyway of the flywheel will significantly reduce the safety factor of the flywheel structural strength. The use of interference transfer between the wheel and shaft can prevent loosening, but rely on Interference ratio transfer of torque between the axles will greatly increase the stress level of the flywheel structure at operating speed, and increase the difficulty of assembly

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