Bracket air duct assembly of fan

Abstract

The utility model relates to the technical field of fans, in particular to a support and air duct assembly of a fan, which solves the problems that an outer ring of an impeller and the inner wall of an air duct cannot be provided with a smaller gap in the structure of an existing fan and the rigidity of a support of the fan is insufficient, and is provided with a support and an air duct, the inner ends of the connecting ribs are fixed to the motor fixing disc, the outer ends of the connecting ribs are fixed to the air cylinder, the air cylinder and the motor fixing disc are steel plate forming parts, the connecting ribs are steel plate forming parts, the inner ends and the outer ends of the connecting ribs are welded to the motor fixing disc and the air cylinder respectively, and the connecting ribs are provided with air inlet folded edges close to the impeller and air outlet folded edges far away from the impeller. An included angle is formed between the air inlet folded edge and the air outlet folded edge, the air outlet folded edge is parallel to the axis of the air duct, the outer end of the connecting rib is provided with a welding folded edge attached to the inner wall of the air duct, the air outlet of the air duct is a horn mouth with a large opening outside, and the welding folded edge is attached to the inner wall of the horn mouth.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine technology, and in particular to a wind turbine support duct assembly. Background Technology

[0002] Axial flow fans with ducts can effectively reduce noise and improve ventilation efficiency. These fans mainly consist of a duct, motor, impeller, and grille. The motor is fixed inside the duct by a bracket. Flanges on the duct are used to secure the fan to external devices or facilities. The duct is generally a stretched cylindrical shape designed to maintain a high degree of roundness, as illustrated in Chinese Patent Publication No. CN218817094U, "An Inverted Axial Flow Fan." Figure 2 This paper illustrates a support structure and its installation on a ventilation duct. The support has a motor mounting plate, and several circumferentially distributed connecting ribs have their inner ends fixed to the motor mounting plate and their outer ends welded with fixing ears. The fixing ears are then bolted to the flange of the ventilation duct. This structure is relatively convenient in terms of manufacturing and installation, but it also has the following drawbacks: First, the bolted connection between the fixing ears and the ventilation duct causes a misalignment between the motor axis and the ventilation duct axis. The gap in the bolt holes makes it impossible to guarantee the roundness of the ventilation duct supported radially by the connecting ribs. To address this misalignment, a large gap needs to be left between the outer ring of the impeller and the inner wall of the ventilation duct, which reduces ventilation efficiency. Second, the connecting ribs of the support are flat, so flat steel is typically used and set at an angle to provide support and airflow. This results in slightly insufficient rigidity. Furthermore, it is difficult to ensure that the flat steel profile and the plate-formed fixing ears are made of the same material, and their welding performance is also insufficient. Similarly, the connecting ribs and the inner plate-formed motor mounting plate also have poor welding performance. The strength of these two welded connections directly affects the support rigidity and usability of the support. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a fan support and duct assembly that overcomes the problems of existing fans not being able to make the impeller outer ring and the inner wall of the duct have a small gap and the fan support is not rigid enough.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a fan support and duct assembly, comprising a support and a duct, wherein the support includes a motor fixing plate and a plurality of circumferentially distributed connecting ribs, the inner end of the connecting ribs being fixed to the motor fixing plate and the outer end being fixed to the duct, the duct and the motor fixing plate being steel plate forming parts, the connecting ribs being steel plate forming parts, the inner end and the outer end of the connecting ribs being welded to the motor fixing plate and the duct respectively, the connecting ribs having an air inlet flange similar to the impeller and an air outlet flange distant from the impeller, the air inlet flange and the air outlet flange being set at an included angle, and the air outlet flange being parallel to the axis of the duct.

[0005] Specifically, in order to increase the length of the welding line and improve the welding strength, the outer end of the connecting rib has a welding flange that fits against the inner wall of the air duct, and the connecting rib and the air duct are welded together at the edge of the welding flange.

[0006] Specifically, in order to ensure the roundness of the air duct by the welded bracket, the air outlet of the air duct is a flared mouth with the larger opening facing outwards, and the welded folded edge is attached to the inner wall of the flared mouth.

[0007] Specifically, in order for the connecting rib to function as a stationary blade, the inner angle between the air inlet fold and the air outlet fold is complementary to the torsion angle of the impeller used in the fan.

[0008] Specifically, the number of connecting ribs is 8 to 12.

[0009] Specifically, the outer contour of the motor mounting plate is polygonal, and each side of the outer ring of the motor mounting plate has a reinforcing folded edge perpendicular to the plate surface. The number of sides of the polygonal motor mounting plate is equal to the number of connecting ribs, and the connecting ribs welded to the motor mounting plate are located between two adjacent reinforcing folded edges.

[0010] The beneficial effects of this utility model are:

[0011] I. This utility model welds the support frame and the air duct into one piece, ensuring that the air duct never becomes out of round and also ensuring the consistency between the motor shaft and the air duct shaft. This allows for a smaller gap between the impeller and the air duct, which can improve the ventilation efficiency of the fan.

[0012] 2. The connecting ribs of the bracket, the motor mounting plate of the bracket, and the air duct can be made of the same steel plate forming parts, which have good weldability. After the connecting ribs are formed, they become air guide vanes on the one hand, and the bending structure of the air inlet fold and air outlet fold improves the rigidity of the bracket on the other hand, and the welding fold improves the welding firmness. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a three-dimensional representation of the present invention. Figure 1 ;

[0015] Figure 2 yes Figure 1 Enlarged view of point A;

[0016] Figure 3 This is a three-dimensional representation of the present invention. Figure 2 ;

[0017] Figure 4 This is a cross-sectional view of the connecting rib in this utility model.

[0018] In the diagram: 1. Bracket, 1-1. Motor mounting plate, 1-1-1. Reinforcing fold, 1-2. Connecting rib, 1-2-1. Air inlet fold, 1-2-2. Air outlet fold, 1-2-3. Welding fold, 2. Air duct, 2-1. Trumpet mouth. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0020] As attached Figure 1 The fan support and duct assembly comprises a support 1 and a duct 2. The support 1 includes a motor mounting plate 1-1 and eight circumferentially distributed connecting ribs 1-2. The inner ends of the connecting ribs 1-2 are fixed to the motor mounting plate 1-1, and the outer ends are fixed to the duct 2. The duct 2 and the motor mounting plate 1-1 are formed steel plate components, and the connecting ribs 1-2 are also formed steel plate components. Figure 3 The inner and outer ends of the connecting rib 1-2 are welded to the motor mounting plate 1-1 and the air duct 2, respectively. The connecting rib 1-2 has an air inlet flange 1-2-1 that is similar to the impeller and an air outlet flange 1-2-2 that is far from the impeller. The air inlet flange 1-2-1 and the air outlet flange 1-2-2 are set at an angle, and the air outlet flange 1-2-2 is parallel to the axis of the air duct 2.

[0021] The outer end of the connecting rib 1-2 has a welded flange 1-2-3 that fits against the inner wall of the air duct 2. The connecting rib 1-2 and the air duct 2 are welded together at the edge of the welded flange 1-2-3, as shown in the attached figure. Figure 2 As shown, the welded fold 1-2-3 is rectangular. The edges at the bends of the welded fold 1-2-3 are not welded to avoid damaging the bend structure during welding. The welds are set on the other three edges. The weld scars are not shown in the attached drawing.

[0022] Still see Figure 1 and Figure 2 The air outlet of the air duct 2 is a flared mouth 2-1 with the larger opening facing outwards, and the welded folded edge 1-2-3 is attached to the inner wall of the flared mouth 2-1.

[0023] The inner angle α between the air inlet fold 1-2-1 and the air outlet fold 1-2-2 is complementary to the torsion angle of the impeller used in the fan. The connecting rib 1-2 guides the airflow to be consistent with the fan axis by the air outlet fold 1-2-2.

[0024] like Figure 3The outer contour of the motor fixing plate 1-1 is octagonal. Each side of the outer ring of the motor fixing plate 1-1 has a reinforcing folded edge 1-1-1 perpendicular to the plate surface. The connecting rib 1-2 welded to the motor fixing plate 1-1 is located between two adjacent reinforcing folded edges 1-1-1. The gap between the adjacent reinforcing folded edges 1-1-1 forms a positioning clamp for the air outlet folded edge 1-2-2 of the connecting rib 1-2.

[0025] The above description is only a specific embodiment of the present utility model. Various examples and illustrations do not constitute a limitation on the substantive content of the present utility model. Those skilled in the art can make modifications or variations to the above-described specific embodiments after reading the description without departing from the essence and scope of the utility model.

Claims

1. A fan support and duct assembly, comprising a support (1) and a duct (2), wherein the support (1) includes a motor mounting plate (1-1) and a plurality of circumferentially distributed connecting ribs (1-2), the inner ends of the connecting ribs (1-2) being fixed to the motor mounting plate (1-1) and the outer ends being fixed to the duct (2), and the duct (2) and the motor mounting plate (1-1) being steel plate forming parts, characterized in that: The connecting rib (1-2) is a steel plate forming part. The inner end and outer end of the connecting rib (1-2) are welded to the motor fixing plate (1-1) and the air duct (2) respectively. The connecting rib (1-2) has an air inlet flange (1-2-1) similar to the impeller and an air outlet flange (1-2-2) far from the impeller. The air inlet flange (1-2-1) and the air outlet flange (1-2-2) are set at an included angle. The air outlet flange (1-2-2) is parallel to the axis of the air duct (2).

2. The fan support and duct assembly according to claim 1, characterized in that: The outer end of the connecting rib (1-2) has a welded flange (1-2-3) that fits into the inner wall of the air duct (2), and the connecting rib (1-2) and the air duct (2) are welded together at the edge of the welded flange (1-2-3).

3. The fan support and duct assembly according to claim 2, characterized in that: The air outlet of the air duct (2) is a flared mouth (2-1) with the larger opening facing outwards, and the welded folded edge (1-2-3) is attached to the inner wall of the flared mouth (2-1).

4. The fan support and duct assembly according to claim 1, characterized in that: The inner angle between the air inlet fold (1-2-1) and the air outlet fold (1-2-2) is complementary to the torsion angle of the impeller used in the fan.

5. The fan support and duct assembly according to claim 1, characterized in that: The number of connecting ribs (1-2) is 8 to 12.

6. The fan support and duct assembly according to claim 5, characterized in that: The outer contour of the motor fixing plate (1-1) is polygonal. Each side of the outer ring of the motor fixing plate (1-1) has a reinforcing fold (1-1-1) perpendicular to the plate surface. The number of sides of the polygonal motor fixing plate (1-1) is equal to the number of the connecting ribs (1-2). The connecting ribs (1-2) welded to the motor fixing plate (1-1) are located between two adjacent reinforcing folds (1-1-1).

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