Structure for reducing tensile stress of blade

Abstract

The utility model discloses a structure for reducing tensile stress of blades, which comprises a hub, a first blade and a second blade fixedly connected with the hub are arranged in the hub, and bent plates fixedly connected with the first blade, the second blade and the front end of the hub are arranged at the first blade, the second blade and the front end of the hub. The impeller has the advantages that the phenomenon that tensile stress of the blades is reduced under the condition that the impeller runs and is used at high temperature and high speed for a long time is avoided, the front end faces, making contact with a cast hub, of the blades are not subjected to unsoldering and tension cracking, the strength of the whole impeller is enhanced, the service life of the impeller can be greatly prolonged, and the requirements of customers are met.

Description

Technical Field

[0001] The utility model relates to the technical field of bell-type annealing furnaces, in particular to a structure for reducing the tensile stress of blades. Background Art

[0002] With the continuous update and development of the hood annealing furnace industry, the strength and service life requirements of the hood furnace impeller are further improved. Since the hood annealing furnace is used to heat, insulate and cool the steel plate coils placed on the furnace table and protected by the inner cover, the circulating fan is one of the most important and critical equipment of the hood furnace in this process. The strength of the fan impeller also directly affects the output and quality of the annealed products. The impeller plays a vital core role. The traditional large-volume hood furnace impeller has a large inner diameter of the front disk air inlet, and the blades are only welded to the casting hub. When the impeller is used at high temperature and high speed, the contact end surface of the blade and the casting hub is prone to desoldering and cracking. Utility Model Content

[0003] The purpose of the utility model is to provide a structure for reducing the tensile stress of blades, so as to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a structure for reducing the tensile stress of blades, comprising a hub and a front disk, wherein the hub is provided with a first blade and a second blade fixedly connected thereto, and the first blade, the second blade and the front end of the hub are provided with a bending plate fixedly connected thereto.

[0005] Further optimized, the thicknesses of the first blade and the second blade are 4 mm and 6 mm respectively.

[0006] Further optimized, the first blade is welded to the second blade to form an integrated structure, and is welded to the hub.

[0007] Further optimized, the bending plate is made of steel material, and its size is 120x60x4mm, and the bending plate is welded to the second blade and the front end of the hub respectively.

[0008] For further optimization, the first blade and the second blade are of different sizes and are welded into one at different angles.

[0009] For further optimization, there is a certain gap between the bending plate and the inner wall of the hub.

[0010] Further optimized, the wheel hub is an integrally formed steel structure.

[0011] In a further optimization, the front disk and the first blade tip are welded to each other.

[0012] Beneficial Effects

[0013] The structure for reducing the tensile stress of the blades provided by the utility model avoids the tensile stress of the blades when the impeller is used at high temperature and high speed for a long time, so that the front end surface where the blade contacts the casting hub will not produce desoldering and cracking, thereby enhancing the strength of the entire impeller and greatly extending the service life of the impeller, thereby meeting the requirements of customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic cross-sectional view of the overall structure of the utility model.

[0015] Reference numerals

[0016] 1-bending plate, 2-front disc, 3-first blade, 4-second blade, 5-hub. DETAILED DESCRIPTION

[0017] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0018] Example

[0019] like Figure 1 As shown, a structure for reducing blade tensile stress is characterized in that it includes a hub 5 and a front disk 2, the hub 5 is provided with a first blade 3 and a second blade 4 fixedly connected thereto, and the first blade 3, the second blade 4 and the hub 5 are provided with a bending plate 1 fixedly connected thereto at the front end.

[0020] In this embodiment, the thickness of the first blade 3 and the second blade 4 are 4 mm and 6 mm respectively. The first blade 3 and the second blade 4 are welded to form an integrated structure and are welded to the hub 5. The impeller with an integrated structure meets the strength requirements and has a better effect during use.

[0021] The bending plate 1 is made of steel and has a size of 120x60x4mm. The bending plate 1 is welded to the front ends of the second blade 4 and the hub 5 respectively.

[0022] The first blade 3 and the second blade 4 are of different sizes and are welded together at different angles. After the two blades of different sizes are welded together, the undesirable phenomenon of desoldering or cracking of the contact end surface between the blade and the hub 5 caused by the large inner diameter of the air outlet of the front disk 2 can be prevented.

[0023] There is a certain gap between the bending plate 1 and the inner wall of the hub 5. The welding surface of the bending plate 1 contacts the front end of the hub 5 and does not occupy the internal space of the hub 5. This not only strengthens the impeller strength but also does not affect the air intake. The hub 5 is an integrally formed steel structure and is suitable for high temperature and high speed environments.

[0024] The front disk 2 and the ends of the first blades 3 are welded to each other.

[0025] First, the original blades are divided into 4mm thick blades and 6mm thick blades, and combined into one for grinding and welding, and then welded and assembled with the casting hub. After the welding of the entire impeller is completed, the bent steel plate is welded to the combined blades and the front end surface of the casting hub. This not only avoids the reduction of tensile stress on the blades when the impeller is used at high temperature and high speed for a long time, but also prevents desoldering and cracking at the front end surface where the blade contacts the casting hub, thereby enhancing the strength of the entire impeller, and can greatly extend the service life of the impeller and meet customer requirements.

[0026] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the utility model content within the protection scope of the utility model.

Claims

1. A structure for reducing blade tensile stress, characterized in that: The invention comprises a wheel hub (5) and a front disc (2); a first blade (3) and a second blade (4) fixedly connected to the wheel hub (5) are provided inside the wheel hub (5); and a bending plate (1) fixedly connected to the first blade (3), the second blade (4) and the front end of the wheel hub (5) are provided.

2. The structure for reducing blade tensile stress according to claim 1, characterized in that: The thickness of the first blade (3) and the second blade (4) are 4 mm and 6 mm respectively.

3. The structure for reducing blade tensile stress according to claim 2, characterized in that: The first blade (3) and the second blade (4) are welded together to form an integrated structure, and are also welded together to the hub (5).

4. The structure for reducing blade tensile stress according to claim 1, characterized in that: The bending plate (1) is made of steel and has a size of 120x60x4mm. The bending plate (1) is welded to the second blade (4) and the front end of the hub (5) respectively.

5. The structure for reducing blade tensile stress according to claim 1, characterized in that: The first blade (3) and the second blade (4) are of different sizes and are welded together at different angles.

6. The structure for reducing blade tensile stress according to claim 1, characterized in that: There is a certain gap between the bending plate (1) and the inner wall of the hub (5).

7. The structure for reducing blade tensile stress according to claim 1, characterized in that: The wheel hub (5) is an integrally formed steel structure.

8. The structure for reducing blade tensile stress according to claim 1, characterized in that: The front disc (2) and the ends of the first blades (3) are welded to each other.

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