A double-layer stable air inlet device for fan impeller front disc and air inlet

Abstract

The utility model belongs to fan technical field, concretely relates to a fan impeller front disc and double -deck stable air inlet device of air inlet, including air inlet and impeller, the front disc of impeller is encased in the outside of air inlet inner end, is equipped with gap between both, is equipped with the reducing section in the inner end place close to air inlet, the side wall section of reducing section is circular arc, its characterized in that the outer side of air inlet inner end encases the cylindrical fairing, and the fairing completely covers reducing section. The utility model has the advantages of reasonable structure, low in cost, the gap size stability between impeller front disc and air inlet. Use the utility model, and the gap between impeller front disc and air inlet is stable and is not affected by the axial installation accuracy of impeller front disc and air inlet, and the assembly difficulty of both is greatly reduced.

Description

Technical Field

[0001] This utility model belongs to the field of wind turbine technology, specifically relating to a double-layer stable air intake device for a wind turbine impeller front disc and air inlet. Background Technology

[0002] A fan is a common abbreviation for gas compression and gas conveying machinery. The term "fan" typically includes ventilators, blowers, and wind turbines. Fans are widely used for ventilation, dust removal, and cooling in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings; ventilation and induced draft in boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances; grain drying and conveying; wind tunnel air sources; and inflation and propulsion for hovercraft.

[0003] Existing fan technology requires a certain gap between the impeller front disc and the air inlet to ensure impeller rotation. This gap has a significant impact on fan performance, and it should be minimized. For example, the utility model patent technology entitled "Anti-Leakage Device for Fan Air Inlet" authorized by the Chinese Patent Office on May 18, 2016, with announcement number CN205243924U, includes an impeller body composed of an impeller rear disc, impeller blades, an impeller front disc, and an air inlet welding ring (i.e., the air inlet). The impeller blades are evenly distributed on the impeller rear disc, and the impeller front disc is welded to the front end of the impeller blades. A trumpet-shaped air inlet welding ring is connected to the front end of the impeller front disc.

[0004] Although the air inlet of the aforementioned fan inlet anti-leakage device is generally shaped like a large horn with a larger left side and a smaller right side, its inner end (right end) is also shaped like a small horn with a smaller left side and a larger right side. The connection between the large and small horns is a variable diameter section, and the side wall of the variable diameter section is arc-shaped. Due to installation and manufacturing errors, the axial fit accuracy between the impeller front disc and the air inlet is difficult to guarantee. If the air inlet is offset to the left or right relative to the impeller front disc, the gap between the impeller front disc and the air inlet will change, which can easily cause the gap to be too large or too small. If the gap is too large, it will affect the performance of the fan; if the gap is too small, it will affect the rotation of the impeller front disc. Utility Model Content

[0005] The purpose of this utility model is to provide a double-layer stable air intake device for a fan impeller front disc and an air inlet. A cylindrical rectifier ring is set on the outer side of the inner end of the air inlet, and the inner end of the air inlet is transformed into a cylindrical structure with a uniform outer diameter, so that the gap between the impeller front disc and the air inlet is stable and is not affected by the axial installation accuracy of the air inlet and the impeller front disc.

[0006] This utility model is achieved through the following technical solution: A dual-layer stabilizing air intake device for a fan impeller front disc and an air inlet includes an air inlet and an impeller. The front disc of the impeller is fitted on the outer side of the inner end of the air inlet, with a gap between them. A variable diameter section is provided near the inner end of the air inlet, and the side wall cross-section of the variable diameter section is arc-shaped. The device is characterized in that a cylindrical rectifier ring is fitted on the outer side of the inner end of the air inlet, and the rectifier ring completely covers the variable diameter section.

[0007] The principle of this utility model is as follows: By fitting a rectifier ring that completely covers the variable diameter section on the outer side of the inner end of the air inlet, it is equivalent to transforming the inner end of the air inlet from a horn-shaped structure with a smaller left side and a larger right side into a cylindrical structure with a constant outer diameter. When assembling the impeller front disc and the air inlet, it is only necessary to ensure that the two are coaxial. Whether the air inlet is offset to the left or right relative to the impeller front disc will not change the size of the gap between the two. Under the premise of ensuring a stable gap, the assembly difficulty of the impeller front disc and the air inlet is greatly reduced.

[0008] This invention features a rectifier ring fitted on the outer side of the inner end of the air inlet, forming a double-layer stable structure at the inner end of the air inlet, making it less prone to collision and deformation during disassembly and assembly.

[0009] Furthermore, the inner end of the rectifier ring of this invention is flush with the inner end of the air inlet or protrudes outward from the inner end of the air inlet.

[0010] Furthermore, the rectifier ring of this invention is welded to the outer side of the inner end of the air inlet.

[0011] This invention has the advantages of reasonable structure, low cost, and stable gap between the impeller front disc and the air inlet. Using this invention, the gap between the impeller front disc and the air inlet is stable and unaffected by the axial installation accuracy of the impeller front disc and the air inlet, greatly reducing the assembly difficulty. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the installation structure of the air inlet and impeller front plate in existing technology. Figure 2 This is a schematic diagram of the structure of this utility model.

[0013] As shown in the figure: 1. Air inlet; 2. Variable diameter section; 3. Clearance; 4. Impeller front plate; 5. Rectifier ring. Detailed Implementation

[0014] The embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present utility model and are not intended to limit its scope of protection. It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which this utility model pertains.

[0015] like Figure 1 As shown, the air inlet 1 of the existing technology fan is generally shaped like a large horn with a larger left side and a smaller right side. However, its inner end (right end) is also shaped like a small horn with a smaller left side and a larger right side. The connection between the large and small horns is a variable diameter section 2. The side wall cross-section of the variable diameter section 2 is arc-shaped. Due to installation and manufacturing errors, the axial fit accuracy between the impeller front plate 4 and the air inlet 1 is difficult to guarantee. If the air inlet 1 is offset to the left or right relative to the impeller front plate 4, the gap 3 between the impeller front plate 4 and the air inlet 1 will change. This can easily cause the gap 3 to be too large or too small. If the gap 3 is too large, it will affect the performance of the fan. If the gap 3 is too small, it will affect the rotation of the impeller front plate 4.

[0016] like Figure 2 As shown: The inner end of the air inlet 1 of this utility model is fitted with a cylindrical rectifier ring 5 welded on the outer side. The rectifier ring 5 completely covers the variable diameter section 2, and the inner end of the rectifier ring 5 is flush with the inner end of the air inlet 1.

[0017] The rectifier ring 5 transforms the inner end of the air inlet 1 from a flared structure with a smaller left side and a larger right side into a cylindrical structure with a constant outer diameter. When assembling the impeller front plate 4 and the air inlet 1, it is only necessary to ensure that the two are coaxial. If the air inlet 1 is offset to the left or right relative to the impeller front plate 4, it will not change the size of the gap 3 between the two. Under the premise of ensuring the stability of the gap 3, the assembly difficulty of the impeller front plate and the air inlet is greatly reduced.

[0018] A rectifier ring 5 is fitted on the outer side of the inner end of the air inlet 1, so that the inner end of the air inlet 1 forms a double-layer stable structure, making the inner end of the air inlet 1 less prone to collision and deformation during disassembly and assembly.

[0019] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A double-layer stabilizing air intake device for a fan impeller front disc and an air inlet, comprising an air inlet and an impeller, wherein the front disc of the impeller is fitted onto the outer side of the inner end of the air inlet, with a gap between them, and a variable diameter section is provided near the inner end of the air inlet, the sidewall cross-section of the variable diameter section being arc-shaped, characterized in that... A cylindrical rectifier ring is fitted on the outer side of the inner end of the air inlet, and the rectifier ring completely covers the variable diameter section.

2. The double-layer stable air intake device for a fan impeller front disc and air inlet according to claim 1, characterized in that... The inner end of the rectifier ring is flush with the inner end of the air inlet or protrudes outward from the inner end of the air inlet.

3. A double-layer stable air intake device for a fan impeller front disc and an air inlet according to claim 1 or 2, characterized in that... The rectifier ring is welded to the outer side of the inner end of the air inlet.

Images