Empennage of cavity fan blade

Abstract

The utility model relates to a fan blade of an industrial fan, in particular to a cavity type fan blade. Supporting reinforcing ribs are arranged on the two sides in a cavity of the cavity fan blade, two slightly-protruding reinforcing ribs are arranged on each of the upper surface and the lower surface of a cavity between the two supporting reinforcing ribs, so that the cavity is divided into three spaces, the empennage is provided with three protruding reinforcing ribs, and the three protruding reinforcing ribs correspond to the three spaces of the cavity of the fan blade in position. The reinforcing ribs in the middle space are longer than the reinforcing ribs in the other two spaces, are inserted into the fan blades and are fixed by fixing bolts screwed from the tops of the fan blades; the section outer contour curve of the empennage is consistent with the curve type of the fan blade, and the outer side end of the empennage is provided with a windward streamline groove. The axial rigidity of the fan blade is improved, and the air resistance at the tail end of the fan blade is reduced.

Description

Technical Field

[0001] The utility model relates to a fan blade of an industrial fan, in particular to a cavity type fan blade. Background Art

[0002] Currently, many fan blades are extrusion-molded or injection-molded, and are cavity-type. When the fan blades are installed, the ends of the fan blades away from the center of rotation are open cavities. Open cavity fan blades affect the strength of the fan blades and also cause noise when rotating. Therefore, it is necessary to design a fan blade tail to seal one end of the fan blade. The existing tail wing only considers sealing the end of the fan blade to reduce noise, but due to the large size of industrial fans and the extremely high linear speed of the end of the fan blade, the existing tail wing design does not have a reasonable structure to reduce air resistance; in addition, because the fan blades are long, because of their hollow structure, the axial stiffness is poor, and it is easy to produce flexural deformation, causing the end of the fan blade to sag. Summary of the invention

[0003] The utility model aims to solve the above-mentioned defects of the prior art and provides a tail wing of a cavity fan blade. The utility model improves the axial rigidity of the fan blade and reduces the air resistance at the end of the fan blade.

[0004] The utility model discloses a tail wing of a hollow fan blade, a tail wing of a hollow fan blade, wherein support reinforcement ribs are arranged on both sides of the cavity of the hollow fan blade, and two slightly convex reinforcement ribs are respectively arranged on the upper and lower surfaces of the cavity between the two support reinforcement ribs, thereby dividing the cavity into three spaces, and the tail wing is provided with raised reinforcement ribs at three positions corresponding to the three spaces of the fan blade cavity, wherein the reinforcement rib of the middle space is longer than the reinforcement ribs of the other two spaces and is inserted into the fan blade and fixed by fixing bolts screwed in from the top of the fan blade; the outer contour curve of the tail wing cross section is consistent with the curve type of the fan blade, and a windward streamline groove is opened at the outer end of the tail wing.

[0005] The tail wing of the cavity fan blade, among the three raised reinforcing ribs, the middle one is a rectangular piece with a pair of supports in the middle, and the space between the supports is the bolt body accommodating space for the fixing bolt.

[0006] The tail wing of the cavity fan blade has polygonal raised reinforcement ribs on both sides of the tail wing, and the upper and lower ends are connected to the tail wing surface by support rods, and there are transversely arranged T-shaped supports on the sides.

[0007] The tail wing of the cavity fan blade is fastened with a nut after the fixing bolt penetrates the upper and lower surfaces of the fan blade.

[0008] The end of the fan blade of the utility model is inserted into the tail wing to a certain depth, and the tail wing mounting hole is also inserted into the fan blade cavity. The bolt passes through the upper surface of the fan blade, the tail wing mounting hole, and the connection method of the lower surface of the fan blade to fasten the tail wing. The outer contour curve of the tail wing section is consistent with the outer contour curve of the fan blade, and a streamline groove is opened on the outer end of the tail wing to reduce air resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The utility model is further described below in conjunction with the accompanying drawings:

[0010] Figure 1 This is an axonometric view of the utility model in the direction of connecting the blade end;

[0011] Figure 2 It is an axonometric view of the outer end direction of the utility model;

[0012] Figure 3 It is a front view of the practical connection direction of the fan blade end;

[0013] Figure 4 It is a schematic diagram of the utility model and the fan blade after assembly;

[0014] Figure 5 yes Figure 4 CC section view. DETAILED DESCRIPTION

[0015] See also Figure 1-Figure 4 The tail wing of the hollow fan blade of the utility model has support reinforcement ribs on both sides of the cavity of the hollow fan blade 1, and the upper and lower surfaces of the cavity between the two support reinforcement ribs are respectively provided with two slightly convex reinforcement ribs, thereby dividing the cavity into three spaces, and the tail wing 2 is provided with raised reinforcement ribs 4, 5, and 6 at three positions corresponding to the three spaces of the fan blade cavity, wherein the reinforcement rib 22 in the middle space is longer than the reinforcement ribs 4 and 6 in the other two spaces and is inserted into the fan blade and fixed by a fixing bolt 7 screwed in from the top of the fan blade; the outer contour curve of the tail wing cross section is consistent with the blade curve type, and the outer end of the tail wing is provided with a windward streamline groove 3, which greatly reduces the air resistance.

[0016] Example

[0017] The entire tail wing is made of plastic injection molding technology.

[0018] The inner cavity where the fan blade is installed is shaped according to the outer contour curve of the fan blade and maintains a certain clearance fit with the outer contour of the fan blade.

[0019] There is a mounting bolt hole 71 on the middle raised reinforcing rib, and the three raised reinforcing ribs can be inserted into the cavity part in the cross section of the fan blade. Among the three raised reinforcing ribs, the middle reinforcing rib 5 is a rectangular piece with a pair of supports 51 in the middle, and the space between the supports is the bolt body accommodating space of the fixing bolt. The raised reinforcing ribs 4 and 6 on both sides of the tail wing are polygonal, and the upper and lower ends are connected to the tail wing surface by support rods 41 and 61, and there are transversely arranged T-shaped supports 42 and 46 on the side. The shape of the raised reinforcing ribs 4 and 6 corresponds to the shape of the tail wing cavity where they are located.

[0020] Assembly

[0021] Insert the tail wing into the end of the fan blade and insert it to the bottom. Use bolts 7 to pass through the upper surface, the mounting hole 71 in the tail wing, and the lower surface of the fan blade to fasten them together with nuts.

Claims

1. The tail wing of the cavity fan blade, wherein the cavity of the cavity fan blade is provided with supporting reinforcing ribs on both sides, and the upper and lower surfaces of the cavity between the two supporting reinforcing ribs are respectively provided with two slightly convex reinforcing ribs, thereby dividing the cavity into three spaces, characterized in that: The tail wing is provided with raised reinforcing ribs at three positions corresponding to the three spaces of the fan blade chamber, wherein the reinforcing ribs in the middle space are longer than the reinforcing ribs in the other two spaces and are inserted into the fan blades and fixed by fixing bolts screwed in from the top of the fan blades; the outer contour curve of the tail wing cross section is consistent with the curve type of the fan blade, and a windward streamline groove is opened at the outer end of the tail wing.

2. The tail wing of the cavity fan blade according to claim 1, characterized in that: Among the three raised reinforcing ribs, the middle one is a rectangular piece with a pair of supports in the middle, and the space between the supports is the bolt body accommodating space of the fixing bolt.

3. The tail wing of the cavity fan blade according to claim 1, characterized in that: The raised reinforcing ribs on both sides of the tail wing are polygonal, and the upper and lower ends are connected to the surface of the tail wing by support rods, and the side surfaces are provided with transversely arranged T-shaped supports.

4. The tail wing of the cavity fan blade according to claim 1, characterized in that: The fixing bolts penetrate the upper and lower surfaces of the fan blades and are fastened with nuts.

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