Cavity type fan blade clamping and fixing lining plug-in

Abstract

The utility model relates to a fan blade of an industrial fan, in particular to a cavity type fan blade clamping and fixing lining plug-in. A cavity type fan blade clamping and fixing lining plug-in comprises an outer plug-in, one end of the outer plug-in is forked to clamp the root of a fan blade, the other end of the outer plug-in is fixed on a fan rotating disc, the cavity type fan blade clamping and fixing lining plug-in further comprises a lining plug-in, the lining plug-in is inserted into a cavity of the root of the fan blade, and the upper surface and the lower surface of the lining plug-in are matched with the inner surface of a cavity of the fan blade in shape and size. And the surface contact and clearance fit are formed, and fixing bolts which penetrate through the upper part of the outer inserting piece from bottom to top and penetrate out of the upper part of the outer inserting piece are used for fixing. The contact surface between the clamping piece and the fan blade is increased, stress concentration is reduced, and the service life of the fan blade is prolonged.

Description

Technical Field

[0001] The utility model relates to a blade of an industrial fan, in particular to a cavity type blade clamping and fixing lining plug-in. Background Art

[0002] Industrial fans have large dimensions, especially long blades and heavy weight. Therefore, on the one hand, they need to reduce weight and inertia, and on the other hand, they need to have considerable strength to ensure safety. In order to reduce weight, cavity-type blades can be used to reduce weight, and the strength of the blades can be ensured by selecting appropriate materials. However, according to analysis by industry insiders, the connection between the blades and the fan turntable is the stress concentration area. Therefore, a connector with a fork at one end is used, and the unforked end is connected to the fan turntable. The root of the blade is inserted into the fork end and fixed with bolts in the vertical direction. This method solves the above problems to a certain extent. However, in order to ensure that the fixing bolts have a certain prestress, a large force will be used during installation. At this time, the bolt hole position of the blade will be damaged to a certain extent, which becomes a weak link in the working state of the blade, and is prone to deformation and damage. Summary of the invention

[0003] The utility model aims to solve the above-mentioned defects of the prior art and provides a cavity-type fan blade clamping and fixing lining plug-in. The utility model increases the contact surface between the clamping part and the fan blade, reduces stress concentration, and prolongs the life of the fan blade.

[0004] The utility model discloses a cavity type fan blade clamping and fixing lining plug-in, which comprises an outer plug-in, one end of which is forked to clamp the root of the fan blade, and the other end is fixed on the fan turntable, and also comprises an inner lining plug-in, which is inserted into the cavity at the root of the fan blade, and the shapes and sizes of the upper and lower surfaces of which are matched with the inner surface of the fan blade cavity to form surface contact and clearance fit, and is fixed by fixing bolts which pass through the upper part of the outer plug-in from bottom to top and penetrate out of the upper part of the outer plug-in.

[0005] The cavity-type blade clamping and fixing liner plug-in has three fixing bolts arranged in a row along the outward extension direction of the blade.

[0006] The described cavity-type fan blade clamping and fixing lining plug-in, two of the three fixing bolts close to the center of the fan fix the fan blade outer plug-in, the fan blade cavity wall and the lining plug-in together, and the outermost fixing bolt fixes the fan blade cavity wall and the lining plug-in together.

[0007] The described cavity-type fan blade clamping and fixing liner plug-in, the described fixing bolt also includes a fixing nut and a gasket after being penetrated.

[0008] The described cavity-type fan blade clamping and fixing lining plug-in has reinforcing ribs on both sides of the lining plug-in in the fan blade cavity as limiting baffles of the lining plug-in.

[0009] The cavity-type fan blade clamping and fixing lining plug-in has a surface covered with a rubber layer.

[0010] The hollow blade clamping and fixing lining plug-in is provided with a limiting boss near the root end of the blade.

[0011] The described cavity-type fan blade clamping and fixing lining plug-in has an upper surface of a limiting boss of the lining plug-in provided with notches for marking the upper and lower surfaces of the lining plug-in.

[0012] The cavity-type fan blade clamping and fixing lining plug-in described herein has another section of the lining plug-in and four side surfaces transitioned by circular arcs.

[0013] The utility model adds an inner lining plug-in. The inner lining plug-in and the contact surface of the fan blade adopt a completely matching surface, a clearance fit, and a surface contact. The fixing bolt needs to penetrate the inner lining plug-in. When tightening the fixing bolt, the inner lining plug-in provides a certain support to ensure that the fan blade is not deformed, thereby extending the life of the fan blade. The surface of the inner lining plug-in is coated with a rubber layer, which can not only reduce the wear between the workpieces, but also play the role of a gasket, which is beneficial to the tightening of the fixing bolt. The notch on the limiting boss facilitates the positioning of the corresponding surfaces of the inner lining plug-in and the inner surface of the fan blade cavity during installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings:

[0015] Figure 1 This is a schematic diagram of the assembly of the utility model;

[0016] Figure 2 is an assembly drawing of the outer clamp and the inner liner insert;

[0017] Figure 3 is a cross-sectional view of the part where the fan blade is clamped;

[0018] Figure 4 It is a structural schematic diagram of the liner plug-in in the preferred embodiment of the utility model. DETAILED DESCRIPTION

[0019] See also Figure 1-Figure 3A cavity-type blade clamping and fixing lining plug-in comprises an outer plug-in 2, one end of which is forked to clamp the root of the blade 1, and the other end is fixed to the fan turntable (not clearly shown in the figure), and it also comprises an inner lining plug-in 3, which is inserted into the cavity at the root of the blade, and the shapes and sizes of the upper and lower surfaces thereof match the inner surface of the blade cavity to form a surface contact and clearance fit, and is fixed by a fixing bolt 5 which passes from the upper part of the outer plug-in from bottom to top and penetrates out of the upper part of the outer plug-in.

[0020] The cavity-type blade clamping and fixing liner plug-in has three fixing bolts arranged in a row along the outward extension direction of the blade.

[0021] The described cavity-type fan blade clamps and fixes the lining plug-in. Among the three fixing bolts, two bolts close to the center of the fan fix the fan blade outer plug-in, the fan blade cavity wall and the lining plug-in together, and the outermost fixing bolt fixes the fan blade cavity wall and the lining plug-in together.

[0022] The described cavity-type fan blade clamping and fixing liner plug-in, the described fixing bolt also includes a fixing nut 4 and a gasket after being penetrated.

[0023] The described cavity-type fan blade clamping and fixing lining plug-in, the lining plug-in in the fan blade cavity is provided with reinforcing ribs on both sides as the limiting stopper of the lining plug-in (see Figure 2 ).

[0024] As a preferred embodiment of the present invention, please see Figure 4 The surface of the lining plug 3 is coated with a rubber layer 31 to reduce the wear between the workpieces. At the same time, the rubber layer can also act as a gasket to improve the fastening force of the fixing bolts. The lining plug is provided with a limiting boss 32 near the root end of the fan blade to prevent the lining plug from extending too far into the fan blade cavity. Since the shape of the lining plug is matched with the fan blade cavity, the upper surface of the limiting boss of the lining plug is provided with a notch 33 for marking the upper and lower surfaces of the lining plug to facilitate identification and installation. The other section of the lining plug and the four side surfaces are transitioned by an arc 34.

Claims

1. A cavity-type blade clamping and fixing liner plug-in, which includes an outer plug-in, one end of which is forked to clamp the root of the blade, and the other end is fixed to the fan turntable, characterized in that: It also includes an inner lining plug-in, which is inserted into the cavity at the root of the fan blade. The shapes and sizes of its upper and lower surfaces match the inner surface of the fan blade cavity to form surface contact and clearance fit, and is fixed by fixing bolts that pass from bottom to top from the upper part of the outer plug-in and penetrate out of the upper part of the outer plug-in.

2. A cavity-type blade clamping and fixing liner insert according to claim 1, characterized in that: There are three fixing bolts arranged in a row along the outward extending direction of the fan blades.

3. The cavity-type blade clamping and fixing liner insert according to claim 2, characterized in that: The two fixing bolts close to the center of the fan fix the outer insert of the fan blade, the cavity wall of the fan blade and the lining insert together, and the outermost fixing bolt fixes the cavity wall of the fan blade and the lining insert together.

4. A cavity-type blade clamping and fixing liner insert according to claim 1, 2 or 3, characterized in that: The fixing bolt also includes a fixing nut and a gasket after being penetrated.

5. The cavity-type blade clamping and fixing liner insert according to claim 1, characterized in that: Reinforcing ribs are provided on both sides of the lining insert in the fan blade cavity as limiting baffles of the lining insert.

6. The cavity-type blade clamping and fixing liner insert according to claim 1, characterized in that: The surface of the lining plug-in is covered with a glue layer.

7. The cavity-type blade clamping and fixing liner insert according to claim 6, characterized in that: The lining plug-in is provided with a limiting boss near the root end of the blade.

8. The cavity-type blade clamping and fixing liner insert according to claim 6, characterized in that: The upper surface of the limiting boss of the lining plug-in is provided with notches for marking the upper and lower surfaces of the lining plug-in.

9. The cavity-type blade clamping and fixing liner insert according to claim 6, characterized in that: Another section of the lining insert and the four side surfaces are transitioned by arcs.

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