Structure safety-based welding orifice plate flowmeter for power plant

The utility model relates to a flow meter, the power plant welding orifice plate flowmeter comprises a flowmeter shell and an orifice plate, the flowmeter shell is provided with an annular gap with across-shaped section, the orifice plate is arranged in the annular gap, and chamfers which are matched with each other are arranged at the joint of the adjacent inner walls of the outer edge of the annular gap and the joint of the adjacent wall faces of the outer edge of the orifice plate. According to the utility model, the chamfers are arranged on the inner wall adjacent to the outer edge of theannular space, so that cracks caused by local position stress concentration in the use process of the high-temperature and high-pressure flow meter shell are reduced; in addition, the trapezoidal bosses with the chamfers are arranged on the outer side walls of the pore plates, so that excessive welding residual stress caused by inconsistent thermal expansion coefficients in the welding process can be effectively avoided,