Fan blade of steam turbine

Abstract

The fan blade comprises an annular ring, a plurality of rectangular holes are formed in the annular ring, rectangular blocks are arranged in the rectangular holes in an inserted mode, crescent holes are formed in the rectangular blocks, blades penetrate through the crescent holes, penetrating holes are formed in the rectangular blocks, penetrating grooves corresponding to the penetrating holes are formed in the blades, screws are arranged in the penetrating holes, and the screws penetrate into the penetrating grooves. Compared with the prior art, the utility model has the following advantages and effects: the original crescent hole is arranged on the rectangular block, and the blade is inserted into the crescent hole of the rectangular block, so that the blade with a crescent cross section can be effectively prevented from being welded, the requirement on the process is reduced, the cost is reduced, the working efficiency is accelerated, and the yield is improved.

Description

Technical Field

[0001] The utility model relates to a steam turbine, in particular to a fan blade of the steam turbine. Background Art

[0002] A steam turbine, also known as a steam turbine engine, is a rotary steam power device. High-temperature and high-pressure steam passes through a fixed nozzle and becomes an accelerated airflow, which is then sprayed onto the blades, causing the rotor with the blades to rotate and perform work externally. Steam turbines are the main equipment in modern thermal power plants and are also used in the metallurgical industry, chemical industry, and ship power devices.

[0003] Steam turbines require fan blades when in use. Traditional fan blades are made by cutting a crescent hole on an annular ring, inserting the curved blades into the crescent hole and welding them. However, since the blades are curved, the welding process has high requirements, which increases costs on the one hand and reduces work efficiency on the other. Utility Model Content

[0004] The utility model aims to provide a fan blade for a steam turbine.

[0005] The above technical purpose of the utility model is achieved through the following technical scheme: the fan blade of the steam turbine includes an annular ring, a plurality of rectangular holes are arranged on the annular ring, a rectangular block is inserted in the rectangular hole, a crescent hole is arranged on the rectangular block, the blade passes through the crescent hole, a through hole is arranged on the rectangular block, a through groove corresponding to the through hole is arranged on the blade, a screw is arranged in the through hole, and the screw penetrates into the through groove.

[0006] It is further configured as follows: a welding point is provided on the perforation.

[0007] It is further configured as follows: a semicircular groove is provided on the side wall of the annular ring, and the semicircular groove extends to and fits into the through hole.

[0008] It is further configured that: the upper end of the screw extends beyond the position of the through hole.

[0009] In summary, the utility model has the following beneficial effects: by setting the original crescent hole on the rectangular block and inserting the blade into the crescent hole of the rectangular block, it is possible to effectively avoid welding the blades with crescent-shaped cross-sections, thereby reducing the requirements for the process and reducing costs, while also speeding up work efficiency and increasing output. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is the overall structural diagram of the steam turbine fan blade;

[0011] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0012] In the figure: 1, annular ring; 2, rectangular hole; 3, rectangular block; 4, crescent hole; 5, blade; 6, through hole; 7, screw; 8, welding point; 9, semicircular groove. DETAILED DESCRIPTION

[0013] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0014] The fan blade of the steam turbine includes an annular ring 1, which is flat and has a rectangular hole 2. A rectangular block 3 is welded in the rectangular hole 2. The welding of the rectangular block 3 is more convenient and quicker than that of the traditional crescent-shaped one, which can effectively reduce the requirements for the process and improve the work efficiency.

[0015] A crescent hole 4 is horizontally arranged on the rectangular block 3, and the cross-section of the blade 5 is crescent-shaped. The blade 5 is inserted into the rectangular block 3. A through hole 6 is arranged on the rectangular block 3, and a through groove is correspondingly arranged on the blade 5. A screw 7 can pass through the through hole 6 and be fixed in the through groove, thereby fixing the blade 5 and the rectangular block 3.

[0016] Among them, a semicircular groove 9 is provided on the side wall of the annular ring 1, and the semicircular groove 9 extends to the through hole 6. The length of the screw 7 is longer than the sum of the depths of the through hole 6 and the through groove, that is, when the screw 7 is inserted into the through groove and fixed, the upper end of the screw 7 is still a certain distance from the surface of the rectangular block 3. A welding point 8 is provided at this position by welding, so as to fix the screw 7 to prevent the screw 7 from loosening. There is a smooth transition between the welding point 8 and the screw 7 to avoid increasing resistance during rotation.

[0017] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A fan blade of a steam turbine, comprising an annular ring, characterized in that: A plurality of rectangular holes are arranged on the annular ring, a rectangular block is inserted in the rectangular hole, a crescent hole is arranged on the rectangular block, the blade passes through the crescent hole, a through hole is arranged on the rectangular block, a through slot corresponding to the through hole is arranged on the blade, a screw is arranged in the through hole, and the screw goes deep into the through slot.

2. The fan blade of the steam turbine according to claim 1, characterized in that: A welding point is arranged on the perforation.

3. The fan blade of the steam turbine according to claim 1, characterized in that: A semicircular groove is arranged on the side wall of the annular ring, and the semicircular groove extends to and fits into the through hole.

4. The fan blade of the steam turbine according to claim 1, characterized in that: The upper end of the screw extends beyond the position of the through hole.

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