Deflector ring for exhaust hood of turbine

Abstract

The invention discloses a deflector ring for an exhaust hood of a turbine. The deflector ring comprises a flange assembly and a ring plate assembly fixedly connected with the flange assembly. A mounting and fixing spigot connected with the ring plate assembly is formed in the upper surface of the flange assembly, and a steam sealing mounting groove is formed in the inner wall of the flange assembly. The ring plate assembly comprises a skew line ring plate segment, an arc ring plate segment and an orthogonal straight line ring plate segment which are arranged to be of an integral structure. A plurality of supporting rib plates are fixedly connected between the upper surface of the flange assembly and the outer surface of the ring plate assembly, and lifting holes and water tube locating grooves for fixing a water spraying tube are formed in the supporting rib plates. The ring plate assembly is changed to a three-segment type structure with the skew line ring plate segment, the arc ring plate segment and the orthogonal straight line ring plate segment from an original full straight line type structure, so that the stability of a flow field in the diffusion process is guaranteed, and no obvious flow separation or vortex is generated; and the diffusion capacity is improved, and flow losses are reduced.

Description

technical field [0001] The invention belongs to the technical field of steam turbines, and in particular relates to a guide ring used for exhaust cylinders of steam turbines. Background technique [0002] In the flow inside the exhaust cylinder, the vortex motion is the main cause of the pressure loss in the exhaust cylinder. The aerodynamic performance of the exhaust cylinder is affected by many aspects such as the exhaust volute, the geometry of the diffuser, the arrangement of the reinforcement, and the state of the incoming flow. The shape of the diffuser is very important to the fluidity of the entire exhaust cylinder, and directly affects the aerodynamic performance of the exhaust cylinder. [0003] The quality of the guide ring determines the performance of the diffuser. The inner wall of the original diversion ring is linear, the expansion ratio of the diffuser tube is small, the expansion capacity of the exhaust cylinder is low, the static pressure at the inlet is...

AI Technical Summary

Problems solved by technology

The inner wall of the original diversion ring is linear, the expansion ratio of the diffuser tube is small, the expansion capacity of the exhaust cylinder is low, the static pressure at the inlet is higher than the static pressure at the outlet, the vortex of the steam flow in the exhaust cylinder is very serious, and the streamline at the outlet The distribution is extremely uneven, which indirectly leads to a large total pressure loss in the exhaust cylinder

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