Wheel hub locking protection device of axial flow fan with adjustable movable blades

Abstract

A hub locking and protecting device of an axial flow fan with an adjustable moving blade is composed of a hub (1), a bearing box shaft head (2), a protecting cover (3) and a locking nut (4) and is characterized in that the hub (1) is arranged on the bearing box shaft head (2) in a sleeved mode, the locking nut (4) and the bearing box shaft head (2) are screwed in a threaded mode to press and fix the hub (1), and the protecting cover (3) is fixed to the hub (1) through a connecting bolt (6) and provided with an anti-loose gasket (7). The protective cover (3) and the bearing box shaft head (2) are connected through a high-strength bolt (8) by adopting on-site machining and are provided with a self-locking gasket (9); and the square-head set screw (5) is arranged on the protective cover (3) to abut against the locking nut (4). The hub locking protection device of the axial flow fan with the adjustable moving blades is simple in structure and convenient to disassemble and assemble.

Description

Technical Field

[0001] The utility model relates to the field of axial flow fans with adjustable moving blades, and is particularly suitable for conveying highly corrosive gas media. Background Art

[0002] Axial flow fans with adjustable moving blades are used in the flue gas desulfurization and denitrification systems of steel plants. Since the flue gas medium contains more complex corrosive gases, the fan components are severely corroded, especially the main shaft locking components of the axial flow fan. As a result, they cannot be disassembled for maintenance, which seriously affects the maintenance time. Currently, a rotating seal structure is set at the center of the impeller, but the seal wears out after long-term operation, and the main shaft locking components are still corroded. Utility Model Content

[0003] The utility model aims to overcome the above technical defects and provide a hub locking protection device for an axial flow fan with adjustable moving blades which has a simple structure and is easy to assemble and disassemble.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is: composed of a wheel hub (1), a bearing box shaft head (2), a protective cover (3), and a locking nut (4), characterized in that the wheel hub (1) is sleeved on the bearing box shaft head (2), the locking nut (4) is screwed together with the bearing box shaft head (2) to press and fix the wheel hub (1), the protective cover (3) is fixed to the wheel hub (1) by connecting bolts (6), and a locking gasket (7) is provided; the protective cover (3) and the bearing box shaft head (2) are connected by existing processing, and are connected by high-strength bolts (8), and a self-locking gasket (9) is provided; the square head set screw (5) is installed on the protective cover (3) to tighten the locking nut (4).

[0005] By adopting the above technical solution, the shaft head locking component of the bearing box of the axial flow fan with adjustable moving blades is placed in a sealed space to prevent corrosive gas from entering, thereby playing a good protective role for the main shaft locking component of the axial flow fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is a schematic diagram of the structure of the hub locking protection device of the utility model of an axial flow fan with adjustable moving blades;

[0007] In the figure: 1. wheel hub; 2. bearing box shaft head; 3. protective cover; 4. locking nut; 4a. anti-loosening positioning hole; 5. square head set screw; 6. connecting bolt; 7. anti-loosening gasket; 8. high-strength bolt; 9. self-locking gasket. DETAILED DESCRIPTION

[0008] The present invention is further described below in conjunction with the accompanying drawings, which is not intended to limit the scope of protection thereof.

[0009] The hub locking and protection device for a variable-pitch axial-flow fan is composed of a hub (1), a shaft head of the bearing box (2), a protective cover (3), and a locking nut (4). It is characterized in that the hub (1) is sleeved on the shaft head of the bearing box (2), and the locking nut (4) presses and fixes the hub (1) by screwing tightly with the shaft head of the bearing box (2). The protective cover (3) is fixed on the hub (1) through connecting bolts (6), and a lock washer (7) is provided; the connection between the protective cover (3) and the shaft head of the bearing box (2) is processed by on-site matching, and then connected by high-strength bolts (8), and a self-locking washer (9) is provided; a square head set screw (5) is installed on the protective cover (3) to press against the locking nut (4). Adopting this solution is simpler in terms of anti-corrosion compared to setting a rotary seal structure at the center position of the impeller, and the installation and disassembly are also very convenient. In this solution, the locking components of the shaft head of the bearing box of the variable-pitch axial-flow fan are in a sealed space through the protective cover (3), which plays a very good role in protecting the locking components of the main shaft of the axial-flow fan. To prevent the loosening of the shaft head locking components during the rotation of the impeller of the variable-pitch axial-flow fan, lock washers (7) are provided on the connecting bolts (6); self-locking washers (9) are provided on the high-strength bolts (8); since there is no keyway on the shaft head of the bearing box of the variable-pitch axial-flow fan, it is impossible to set a lock washer on the locking nut (4) for anti-loosening. To overcome the loosening problem of the locking nut (4), in this solution, a square head set screw (5) is installed on the protective cover (3) to press against the locking nut (4), and at the same time, an anti-loosening positioning hole (4a) is provided on the locking nut (4), which plays a very good anti-loosening role.

[0010] Therefore, the utility model is a hub locking and protection device for a variable-pitch axial-flow fan with a simple structure and convenient disassembly and assembly.

Claims

1. A hub locking protection device for an axial flow fan with adjustable moving blades is composed of a hub (1), a bearing box shaft head (2), a protection cover (3), and a locking nut (4), and is characterized in that The wheel hub (1) is mounted on the shaft head (2) of the bearing box, and the locking nut (4) is screwed on the shaft head (2) of the bearing box to press and fix the wheel hub (1). The protective cover (3) is fixed on the wheel hub (1) by connecting bolts (6), and a locking gasket (7) is provided. The protective cover (3) and the shaft head (2) of the bearing box are connected by off-the-shelf processing, and are connected by high-strength bolts (8), and a self-locking gasket (9) is provided. The square head set screw (5) is installed on the protective cover (3) to tighten the locking nut (4).

2. The hub locking protection device for an axial flow fan with adjustable moving blades according to claim 1 is characterized in that An anti-loosening positioning hole (4a) is provided on the locking nut (4).

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