Protection ring for main valve rod of steam turbine

Abstract

The utility model provides a protecting ring for a main steam valve rod of a steam turbine, which belongs to the technical field of steam turbines, overcomes the defect that the main steam valve rod of the existing steam turbine is easy to damage, comprises a body, and is characterized in that the body is in a hollow cylinder shape, and one end of the hollow cylinder body is connected with a cone which is gradually reduced inwards; a conical surface is arranged on the outer surface of the cone, a plurality of steps which are gradually reduced upwards are arranged on the inner side of the cone, a protruding column is arranged on the conical surface, and the protruding column, the cone and the body are integrated. Raw materials are saved; the convex column is arranged on the conical surface of the product, airflow rotation is facilitated, the smooth R angle is arranged at the joint of the convex column and the cone, the connection rigidity of the convex column and the cone is improved, and the product quality is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam turbines, in particular to a main steam valve stem protection ring of a steam turbine. Background Art

[0002] In conventional steam turbine main valves, the valve stem is installed in the valve body and valve cover. How to protect the valve stem and limit its position without affecting its normal operation, optimize the installation and connection of the valve stem protection body in the valve cover, and improve the overall quality are technical problems that we urgently need to solve. Utility Model Content

[0003] The purpose of the utility model is to provide a main steam valve stem protection ring for a steam turbine to solve the above technical problems existing in the prior art.

[0004] According to the above purpose, the technical solution of the utility model is: a turbine main steam valve stem protection ring, including a body, characterized in that: the body is hollow cylindrical, one end of the hollow cylindrical body is connected to a cone that gradually decreases inward, the outer surface of the cone is provided with a conical surface, the inner side of the cone is provided with a plurality of steps that gradually decrease upward, the conical surface is provided with a convex column, and the convex column is integrated with the cone and the body.

[0005] Furthermore, the top view cross section of the convex column is a combination of a trapezoid and a semicircle.

[0006] Furthermore, the upper surface of the boss is provided with a sloped surface which is higher inside and lower outside.

[0007] More specifically, the protrusions are evenly distributed on four circles, the inner sides of which do not exceed the inner diameter of the cone, and the outer sides of which do not exceed the outer diameter of the body.

[0008] More specifically, a smooth R angle is provided at the connection between the protruding column and the conical surface.

[0009] Furthermore, the inner ends of the main body and the cone are chamfered.

[0010] Compared with the prior art, the advantages and beneficial effects of this utility model are:

[0011] 1. The hollow cylinder of the utility model is provided with a cone, and a stepped hole is provided in the cone, which is not only convenient for connection with the valve stem, but also makes full use of space and saves raw materials;

[0012] 2. The utility model is provided with a convex column on the conical surface, which can generate airflow rotation under the action of airflow, with small size and great effect;

[0013] 3. The connection between the convex column and the conical surface of the utility model product is provided with a smooth R angle, which improves the connection rigidity between the convex column and the cone and improves the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the three-dimensional structure of the product of the utility model;

[0015] Figure 2 This is a front view structural diagram of the utility model product;

[0016] Figure 3 This is a schematic diagram of the top view of the structure of the utility model product;

[0017] Figure 4 This is a bottom-up structural diagram of the product of the utility model;

[0018] Figure 5 for Figure 3 AA cross-sectional structural diagram;

[0019] In the figure: 1. Main body; 2. Conical surface; 3. Boss; 4. Sloped surface; 5. Step; 6. Chamfer; 7. R angle. DETAILED DESCRIPTION

[0020] Combine Figure 1-Figure 5 , is a schematic diagram of the principle structure of an embodiment of a main steam valve stem protection ring of a steam turbine according to the present invention, the main steam valve stem protection ring of the steam turbine comprises a body 1, the body 1 is a hollow cylinder, the upper end of the hollow cylindrical body 1 is connected to a cone that gradually decreases in diameter inwardly, the outer surface of the cone is provided with a conical surface 2, the inner side of the cone is provided with two steps 5 that gradually decrease upward, the first step is connected to the inner hole of the cylinder by an inclined surface, the conical surface 2 is provided with four evenly distributed protrusions 3, the inner side of which does not exceed the inner diameter of the cone, and the outer side does not exceed the outer diameter of the body 1, the protrusion 3 is formed as a whole with the cone and the body 1, the horizontal cross-section of the protrusion 3 in a top view is a combination of a trapezoid and a semicircle, the outer side is large and the inner side is small, the upper surface of the protrusion 3 is provided with a slope surface 4 that is high inside and low outside to avoid interference with the inner surface of the valve cover.

[0021] Preferably, in order to improve the connection strength of the boss 3, a smooth R angle 7 is provided at the connection between the boss 3 and the conical surface 2. During manufacturing, the excess part can be milled off by a milling machine to retain the boss 3. In order to reduce processing costs, the boss 3 can also be separated and processed separately and then connected to the cone as a whole by welding, and then the surface can be turned into a smooth connection surface by grinding.

[0022] Preferably, in order to reduce the formation of burrs and reduce the deformation caused by collision during assembly, the inner end of the main body 1 and the cone is provided with a chamfer 6, and an asymmetric chamfer is used, for example, Figure 5 As shown, the chamfer 6 may be 30 degrees and 2 mm wide.

[0023] During manufacturing, in order to reduce costs, an integral blank is usually formed by casting, and then the required shape and glossiness are processed on a lathe. The prefabricated boss 3 is then welded to the outer conical surface of the cone through a welding mold, and then the required glossiness is achieved by grinding and sanding.

[0024] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0025] Although this document frequently uses the following terms: 1. body; 2. conical surface; 3. boss; 4. sloped surface; 5. step; 6. chamfer; 7. rounded corner, the use of other terms is not excluded. These terms are used solely to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

[0026] The above is an introduction to the turbine main steam valve stem protection ring provided by the present invention. The introduction uses specific preferred embodiments to illustrate the principles and implementation methods of the present invention. These embodiments are only used to help understand the principles and core ideas of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the design ideas of the present invention, the implementation plans in the above embodiments can be further combined or replaced, and the present invention can be improved and modified in several ways. These improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A steam turbine main steam valve stem protection ring, comprising a body (1), characterized in that: The body (1) is in the shape of a hollow cylinder. One end of the hollow cylindrical body (1) is connected to a cone whose diameter gradually decreases inwards. The outer surface of the cone is provided with a conical surface (2). The inner side of the cone is provided with a plurality of steps (5) that gradually decrease upwards. A convex column (3) is provided on the conical surface (2). The convex column (3) is integrated with the cone and the body (1).

2. The steam turbine main steam valve stem protection ring according to claim 1, characterized in that: The top view cross section of the convex column (3) is a combination of a trapezoid and a semicircle.

3. The steam turbine main steam valve stem protection ring according to claim 1 or 2, characterized in that: The upper surface of the convex column (3) is provided with a slope surface (4) that is higher inside and lower outside.

4. The steam turbine main steam valve stem protection ring according to claim 3, characterized in that: The convex columns (3) are evenly distributed on four circumferences, the inner sides of which do not exceed the inner diameter of the cone, and the outer sides of which do not exceed the outer diameter of the body (1).

5. The steam turbine main steam valve stem protection ring according to claim 3, characterized in that: A smooth R angle (7) is provided at the connection between the convex column (3) and the conical surface (2).

6. The steam turbine main steam valve stem protection ring according to claim 1, characterized in that: The inner end of the body (1) and the cone is provided with a chamfer (6).

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