Single rib hollow blade tail

Abstract

The utility model relates to the blades of an industrial fan, and more particularly to a tail wing of a cavity blade. The tail wing of a single-rib cavity blade has two raised ribs in the tail wing, one of which is an "I-shaped rib and the other is a triangular rib. The tail wing is inserted into the end of the blade, and the rib of the blade is inserted between the two raised ribs. The tail wing also includes a square nut located in the I-shaped rib, and a bolt fixed to the square nut is screwed into the top of the blade to connect the blade and the tail wing together. The utility model eliminates the noise caused by the blade cavity, improves the installation efficiency of the blade tail wing, and improves the reliability of the installation and fixation of the blade and the tail wing.

Description

Technical Field

[0001] The utility model relates to a fan blade of an industrial fan, in particular to a tail wing of a cavity 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 end of the fan blades away from the rotation center is an open cavity. The open cavity fan blades affect the strength of the fan blades and also cause noise when rotating. For this reason, it is necessary to design a fan blade tail to seal one end of the fan blade. Since the fan blade is a cavity structure, the installation and fixation of the tail structure is a difficult point, especially for fan blades with a single reinforcement rib. The connection between the tail and the fan blade is even more difficult. 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 single-rib hollow fan blade. The utility model eliminates the noise caused by the fan blade cavity, improves the installation efficiency of the fan blade tail wing, and improves the reliability of the installation and fixation of the fan blade and the tail wing.

[0004] The utility model discloses a tail wing of a single-rib type hollow blade fan, wherein two raised reinforcement ribs are arranged inside the tail wing, wherein one is an I-shaped reinforcement rib and the other is a triangular reinforcement rib, the tail wing is inserted into the end of the fan blade, and the reinforcement rib of the fan blade is just inserted between the two raised reinforcement ribs, the tail wing also includes a square nut located inside the I-shaped reinforcement rib, and a bolt fixed to the square nut is screwed into the top of the fan blade to connect the fan blade and the tail wing together.

[0005] The tail wing of the single-rib hollow fan blade, the upper and lower flange ends of the I-shaped reinforcement rib are bent toward each other, and the web length is smaller than the flange length to leave space for accommodating the square nut and to limit it. When the square nut is against the web, its screw hole coincides with the center of the bolt hole on the tail wing and the fan blade.

[0006] The tail wing of the single-rib hollow blade fan has blade insertion depth limiting ribs distributed on the inner wall of the tail wing.

[0007] For the tail wing of the single-rib hollow blade, the bolt only penetrates the upper surface of the blade.

[0008] The fan blade cross section of the utility model has only one through reinforcing rib, and the two raised reinforcing ribs in the inner cavity of the tail wing are one I-shaped and the other triangular. When installed, the only reinforcing rib in the fan blade cross section is just stuck in the gap between the I-shaped reinforcing rib and the triangular reinforcing rib, which plays a positioning role. In the inner cavity of the tail wing, there are reinforcing ribs that limit the insertion depth of the fan blades, which not only improve the strength of the tail wing, but also limit the insertion depth of the fan blades. When the fan blades are inserted into the bottom of the tail wing, the fixed installation holes of the fan blades are just aligned and concentric with the fixed installation holes of the tail wing; in the I-shaped reinforcing ribs, there are square nut installation grooves and square nut limiting reinforcing ribs. When the square nut is inserted into the square nut installation groove, the square nut limiting reinforcing ribs constrain the insertion depth of the nut and ensure the alignment and concentricity of the square threaded hole and the installation hole. In this way, not only the noise caused by the fan blade cavity is eliminated, but also the efficiency of the fan blade installation is improved, and the reliability of the installation and fixation of the fan blades and the tail wing is improved. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0010] Figure 1 This is the front view of the utility model;

[0011] Figure 2 It is the appearance diagram of the utility model;

[0012] Figure 3 is an outline diagram of the fan blades and tail wing after assembly;

[0013] Figure 4 yes Figure 3 The BB section view;

[0014] Figure 5 yes Figure 3 The CC section view;

[0015] Figure 6 yes Figure 3 EE cross-sectional view. DETAILED DESCRIPTION

[0016] See also Figure 1-Figure 6 The tail wing of the single-rib hollow blade of the utility model is:

[0017] (1) The whole is made of plastic injection molding technology.

[0018] (2) The inner cavity of the tail wing 1 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] (3) There is only one through reinforcing rib 21 in the cross section of the fan blade 2, and there are two raised reinforcing ribs in the inner cavity of the tail wing. In the figure, the raised reinforcing rib 11 is in the shape of an I, and the raised reinforcing rib 12 is in the shape of a triangle. During installation, the only reinforcing rib 21 in the cross section of the fan blade is just stuck in the gap between the I-shaped reinforcing rib and the triangular reinforcing rib, which plays a positioning role.

[0020] (4) There are blade insertion depth limiting reinforcing ribs in the inner cavity of the tail wing, which not only improve the strength of the tail wing, but also limit the blade insertion depth. When the blade is inserted to the bottom of the tail wing, the blade's fixing hole is aligned and concentric with the tail wing's fixing hole.

[0021] (5) In the inner cavity of the tail wing, there is a square nut installation position in the I-shaped reinforcement rib 11, and the web serves as a square nut limiting reinforcement rib. When the square nut is inserted into the square nut installation groove, the square nut limiting reinforcement rib constrains the insertion depth of the nut and ensures that the square threaded hole is aligned and concentric with the installation hole.

[0022] 2. Assembly method

[0023] Insert the tail wing into the end of the fan blade and insert it to the bottom, and then use bolt 4 to pass through the upper surface, the mounting hole in the tail wing, and the upper surface of the fan blade to fasten them together.

[0024] The fan blades are of high strength after assembly, and the connection between the fan blades and the tail wing is reliable.

Claims

1. The tail wing of a single-rib hollow blade is characterized in that: Two raised reinforcing ribs are provided in the tail wing, one of which is an I-shaped reinforcing rib and the other is a triangular reinforcing rib. The tail wing is inserted into the end of the fan blade, and the reinforcing rib of the fan blade is inserted between the two raised reinforcing ribs. The tail wing also includes a square nut located in the I-shaped reinforcing rib. A bolt fixed to the square nut is screwed into the top of the fan blade to connect the fan blade and the tail wing together.

2. The tail wing of the single-rib hollow blade according to claim 1, characterized in that: The upper and lower flange ends of the I-shaped reinforcement rib are bent toward each other, and the web length is smaller than the flange length to leave space for accommodating the square nut and to limit it. When the square nut rests against the web, its screw hole coincides with the center of the bolt hole on the tail wing and the fan blade.

3. The tail wing of the single-rib hollow blade according to claim 1, characterized in that: The inner wall of the tail wing is provided with blade insertion depth limiting reinforcing ribs.

4. The tail wing of the single-rib hollow blade according to claim 1, characterized in that: The bolts only penetrate the upper surface of the blade.

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