Steam inlet flow guide rib structure of anti-impact valve rod

By installing the flow guide ribs arranged longitudinally in the steam inlet passage of the turbine, high-pressure and high-speed steam is prevented from directly impacting the regulating valve stem, the vibration, deformation and cracks caused by the airflow impact of the valve stem in the prior art are solved, and the stability and safety and reliability of the turbine are improved.

CN119712246AActive Publication Date: 2025-03-28NO 703 RES INST OF CHINA SHIPBUILDING IND CORP
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Patent Information

Application Number
CN202411924721.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-25
Publication Date
2025-03-28
Estimated Expiration
2044-12-25

AI Technical Summary

Technical Problem

The existing valve stems are prone to vibration, deformation and cracks under high-parameter steam impact, resulting in safety hazards. In order to overcome these problems, it is usually necessary to increase the valve stem diameter to increase the safety factor, but this will increase the air leakage.

Method used

A steam inlet guide rib structure for anti-impact valve stem is designed. By installing the steam inlet guide ribs arranged in the steam inlet channel of the turbine, the flow inlet ribs are arranged in the longitudinal centerline position of the steam inlet channel, and the passage is divided into a left-right and symmetrical air flow port to prevent high-pressure and high-speed steam from directly impacting the regulating valve stem.

Benefits of technology

It effectively avoids direct impact of the regulating valve stem of the inlet steam, solves the hidden dangers of vibration, deformation and cracks caused by airflow impact, thereby improving the stability and safety and reliability of the turbine.

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Abstract

The invention discloses a steam inlet flow guide rib structure of an anti-impact valve rod. Relates to the field of turbine valve rods. In the design of the diameter of an existing adjusting valve rod, a large safety coefficient needs to be adopted, the increase of the diameter of the valve rod is limited by design conditions, and the air leakage of the valve rod is correspondingly increased, so that the steam inlet flow guide rib structure for preventing the impact of the valve rod is provided. The adjusting valve comprises a steam turbine steam inlet channel, an adjusting valve rod and an adjusting valve steam chamber, the steam turbine steam inlet channel is connected with the adjusting valve steam chamber, the adjusting valve rod is installed in the adjusting valve steam chamber, and flow guide ribs are longitudinally arranged in the steam turbine steam inlet channel in a uniform-section mode and arranged at the longitudinal center line position of the steam turbine steam inlet channel. A flow guide rib in the steam inlet channel of the steam turbine divides the steam inlet channel of the steam turbine into two airflow ports which are bilaterally symmetrical, the flow guide rib is integrally connected with an inner pipe of the steam inlet channel of the steam turbine, and airflow in the steam inlet channel of the steam turbine is prevented from directly impacting a valve rod in the valve adjusting steam chamber through the flow guide rib. The invention is applied to the field of steam turbine valve rods.
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