Steam filter screen

Abstract

The utility model provides a steam filter screen, which belongs to the technical field of steam turbines, overcomes the defects of low overall quality and high cost of the existing steam filter screen, comprises a filter screen, and is characterized in that the filter screen is cylindrical and is formed by winding plate-shaped steel, filter screen holes which are integrally and uniformly distributed are formed in the filter screen, and the filter screen holes are uniformly distributed in the filter screen. An upper cover ring exceeding the inner wall and the outer wall of the filter screen is arranged at the upper top of the filter screen, a bottom ring exceeding the inner wall and the outer wall of the filter screen is arranged at the upper bottom of the filter screen, and a middle ring with a triangular section cutting plane is further arranged in the middle of the interior of the filter screen. The overall strength is improved; the upper cover ring, the bottom ring and the middle ring are connected with the filter screen into a whole through welding, so that the overall quality and rigidity of the product are ensured; and the filter screen is positioned and assembled through the bayonet, so that the cylindricity quality of the whole filter screen is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam turbines, and particularly relates to a steam filter screen. Background Art

[0002] In the prior art, quick closing valves are known in different design solutions. The quick closing valve is used to suddenly interrupt the pipe flow. In addition, it is known that the quick closing valve is provided with a steam filter screen. The steam filter screen is used to protect the valve and the components arranged downstream of the valve from foreign matters carried in the flow.

[0003] Due to the prevailing operating conditions in the steam turbine, especially in the form of vibration loads and / or temperature fluctuations, the steam filter screen suffers from high wear. Since conventional steam filter screens are only very limitedly suitable for maintenance, the steam filter screens are accordingly replaced by new steam filter screens during regular maintenance cycles, which is accompanied by high costs.

[0004] Another problem with conventional steam filter screens is that the pipe flow is negatively affected by the steam filter screen. In this regard, it is desirable to reduce the negative impact of the steam filter screen on the pipe flow.

[0005] In the Chinese patent literature, there is a patent application with the publication number CN 110944730A and the name of steam filter screen, which solves the above problems. The steam filter screen has two support rings (2) arranged at intervals from each other in the longitudinal direction (L) and a plurality of filter elements (4) arranged adjacent to each other in an annular section shape and having a plurality of through holes (3). The filter elements are respectively detachably fastened to the support rings (2) and extend between the support rings to form an outer side surface, wherein the side edges of the directly adjacent filter elements (4) are in contact with each other. However, the parts of this patent application are relatively numerous, the manufacturing processes are many, the filter net is assembled in multiple pieces, and it is difficult to ensure the cylindricity, and the processing cost remains high.

[0006] How to improve the strength of the overall filter screen, improve the overall quality, and at the same time ensure that the manufacturing cost is controlled within a certain range is the technical problem that we urgently need to solve at present. Summary of the Utility Model

[0007] The purpose of the utility model is to provide a steam filter screen to solve the above technical problems existing in the prior art.

[0008] For the above purpose, the technical solution of the present utility model is: A steam filter screen, including a filter net, characterized in that: the filter net is cylindrical, wound by plate-shaped steel, the filter net is provided with uniformly arranged filter net holes, the top of the filter net is provided with an upper cover ring exceeding the inner and outer walls of the filter net, the bottom of the filter net is provided with a bottom ring exceeding the inner and outer walls of the filter net, and a middle ring with a triangular cross-section is also provided in the middle of the interior of the filter net.

[0009] Further, the upper cover ring, the bottom ring and the middle ring are connected to the filter net as a whole by welding.

[0010] More specifically, the upper cover ring and the bottom ring are provided with clamping openings smaller than the inner wall of the filter net, and the upper cover ring and the bottom ring are clamped together with the upper and lower ports of the filter net through the clamping openings.

[0011] More specifically, the outer walls of the upper cover ring and the bottom ring are provided with chamfered surfaces that are smoothly connected to the outer wall of the filter net.

[0012] Further, paired threaded holes are provided on the upper and lower surfaces of the bottom ring.

[0013] Further, the filter net holes are round or polygonal.

[0014] Further, the unilateral cross-section of the upper cover ring is in an "L" shape.

[0015] Further, the upper cover ring, the bottom ring and the middle ring are arranged in parallel and perpendicular to the inner and outer cylindrical surfaces of the filter net.

[0016] Compared with the prior art, the advantages and beneficial effects of the present utility model are:

[0017] 1. The filter net of the product of the present utility model is cylindrical and wound by plate-shaped steel, reducing the manufacturing process and improving the overall strength;

[0018] 2. The upper cover ring, the bottom ring and the middle ring of the product of the present utility model are connected to the filter net as a whole by welding, ensuring the overall quality and rigidity of the product;

[0019] 3. The upper cover ring and the bottom ring of the product of the present utility model are provided with clamping openings smaller than the inner wall of the filter net. Through positioning, the assembly quality is ensured, and the cylindricity quality of the overall filter net is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional structural schematic diagram of the product of the present utility model;

[0021] Figure 2 is a front view structural schematic diagram of the product of the present utility model;

[0022] Figure 3 isFigure 2 Schematic diagram of the upward view structure;

[0023] Figure 4 is Figure 3 Schematic diagram of the A-A sectional view structure;

[0024] In the figure: 1. Upper cover ring; 2. Filter screen; 3. Bottom ring; 4. Middle ring; 5. Filter screen holes; 6. Threaded holes; 7. Bayonet; 8. Chamfered surface. Specific implementation manner

[0025] Combined with Figure 1 , it is a schematic diagram of the principle structure of an embodiment of a steam filter screen of the present utility model. The steam filter screen includes a filter screen 2. The filter screen 2 is cylindrical and is wound by plate-shaped steel. After winding, it is welded into a cylindrical shape. The filter screen 2 is provided with filter screen holes 5 that are evenly arranged as a whole. The filter screen holes 5 can be formed by punching or by winding a plate with formed filter screen holes 5; an upper cover ring 1 that exceeds the inner and outer walls of the filter screen 2 is provided at the top of the filter screen 2, a bottom ring 3 that exceeds the inner and outer walls of the filter screen 2 is provided at the bottom of the filter screen 2, and a middle ring 4 with a triangular cross-section is further provided in the middle of the inside of the filter screen 2.

[0026] Preferably, the upper cover ring 1, the bottom ring 3 and the middle ring 4 are connected to the filter screen 2 as a whole by welding.

[0027] Further preferably, in order to play a role in connecting and positioning before welding and prevent skew during assembly, bayonets 7 smaller than the inner wall of the filter screen 2 are provided on the upper cover ring 1 and the bottom ring 3, and the upper cover ring 1 and the bottom ring 3 are clamped together with the upper and lower ports of the filter screen 2 through the bayonets 7.

[0028] Further preferably, in order to facilitate welding and save materials, chamfered surfaces 8 that are smoothly connected to the outer wall of the filter screen 2 are provided on the outer walls of the upper cover ring 1 and the bottom ring 3.

[0029] Preferably, paired threaded holes 6 are provided on the upper and lower surfaces of the bottom ring 3, which is convenient for hoisting during assembly.

[0030] Preferably, the filter screen holes 5 are round holes or polygonal shapes.

[0031] Preferably, the unilateral sectional view of the upper cover ring 1 is in an "L" shape.

[0032] Preferably, the upper cover ring 1, the bottom ring 3 and the middle ring 4 are arranged in parallel and are perpendicular to the inner and outer cylindrical surfaces of the filter screen 2.

[0033] During assembly, first wind the plate-shaped steel into a cylindrical shape, then shape it, weld it, and polish the surface to form a hollow cylinder. Then punch the filter holes 5 on a punching device to form the filter net 2, or it can also be formed by winding a plate with formed filter holes 5; respectively process the upper cover ring 1, the bottom ring 3, and the middle ring 4 on a machining device, and polish the burrs for standby; press the middle ring 4 into the appropriate position inside the filter net 2 to ensure that the upper and lower end faces of the middle ring 4 are parallel to the filter net 2, and then weld the upper and lower sides of the middle ring 4 and the filter net 2 into one body; then press the upper cover ring 1 and the bottom ring 3 into both ends of the filter net 2 to ensure that the upper cover ring 1 and the bottom ring 3 are pressed in place, that is, the upper cover ring 1 and the bottom ring 3 are parallel to each other and perpendicular to the overall cylinder of the filter net; then weld it in place on a welding device and polish the welding part to ensure that there are no burrs and holes in the welding.

[0034] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0035] Although the terms such as 1. upper cover ring; 2. filter net; 3. bottom ring; 4. middle ring; 5. filter hole; 6. threaded hole; 7. bayonet; 8. chamfered surface are used more in this article, the possibility of using other terms is not excluded. The use of these terms is only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

[0036] The above introduces the steam filter provided by the present invention. In this introduction, specific preferred embodiments are used to elaborate on the principle and implementation manner of the present invention. These embodiments are only used to help understand the principle and core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the design idea of the present invention, the implementation schemes in the above embodiments can be further combined or replaced, and several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A steam filter, comprising a filter (2), characterized in that: The filter screen (2) is cylindrical and is formed by winding a plate-shaped steel material. The filter screen (2) is provided with filter screen holes (5) that are evenly arranged as a whole. The top of the filter screen (2) is provided with an upper cover ring (1) that exceeds the inner and outer walls of the filter screen (2). The bottom of the filter screen (2) is provided with a bottom ring (3) that exceeds the inner and outer walls of the filter screen (2). A middle ring (4) with a triangular cross-section is also provided in the middle of the filter screen (2).

2. The steam filter according to claim 1, characterized in that: The upper cover ring (1), the bottom ring (3) and the middle ring (4) are connected to the filter screen (2) as a whole through welding.

3. The steam filter according to claim 1 or 2, characterized in that: The upper cover ring (1) and the bottom ring (3) are provided with a bayonet (7) smaller than the inner wall of the filter screen (2); the upper cover ring (1) and the bottom ring (3) are engaged with the upper and lower ports of the filter screen (2) via the bayonet (7).

4. The steam filter according to claim 1 or 2, characterized in that: The outer walls of the upper cover ring (1) and the bottom ring (3) are provided with chamfered surfaces (8) which are smoothly connected to the outer wall of the filter screen (2).

5. The steam filter according to claim 1, characterized in that: A pair of threaded holes (6) are provided on the upper and lower surfaces of the bottom ring (3).

6. The steam filter according to claim 1, characterized in that: The filter mesh holes (5) are circular holes or polygonal holes.

7. The steam filter according to claim 1, characterized in that: The single-side cross-section of the upper cover ring (1) is in an "L" shape.

8. The steam filter according to claim 1, characterized in that: The upper cover ring (1), the bottom ring (3) and the middle ring (4) are arranged in parallel and perpendicular to the inner and outer cylindrical surfaces of the filter screen (2).

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