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Axial fan blade angle adjustment device outside the machine

A technology of blade angle and axial flow fan, which is applied to the components of the pumping device for elastic fluid, machines/engines, mechanical equipment, etc., to achieve the effects of quick adjustment, reduced labor intensity, and saved working time

Active Publication Date: 2016-04-20
PINGAN ELECTRICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at a series of problems existing in the blade angle adjustment process of the existing axial flow fan, the purpose of the present invention is to provide a relatively simple structure and reliable operation, without disassembling the fan casing and blades, and without disassembling or moving the fan. position, the blade angle of the axial flow fan can be changed outside the machine

Method used

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  • Axial fan blade angle adjustment device outside the machine
  • Axial fan blade angle adjustment device outside the machine
  • Axial fan blade angle adjustment device outside the machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1, the present invention comprises worm gear case 8, connecting rod 12, push plate 18, push plate 27, wheel hub 19, adjustment handle 20, wheel hub 11 and shaft plate 5; The incomplete flange ear plate structure is fixed on the impeller web plate through bolt components; the two ends of the worm 25 are square in cross-section and match with the inner square head of the adjustment handle 20; the worm gear 24 shaft hole The inner thread of the inner thread cooperates with the push plate 18 of the external thread structure; the disc at one end of the push plate 18 is welded with several bushes corresponding to the number of blades 2, and one end of the connecting rod 12 is hinged on the bush with a pin 14; The other end of connecting rod 12 and blade 2 petiole afterbody, are fixed by key pin. When the angle of the blade 2 needs to be adjusted, the adjusting handle 20 is inserted into the square head at the end of the adjusting device worm 25, and the worm 25 is ...

Embodiment 2

[0032] Embodiment 2, the structure that worm 25 is installed on the worm gear case 8 body and two axle ends of worm 25 are left and right symmetrical with respect to the center line of worm gear 8, for reducing the weight that worm 25 and installation structure increase have to impeller rotating motion Due to the impact of balance, the 8 bodies of the worm gear box can be made into a symmetrical structure up and down along the center. However, only one pair of structural parts for mounting the worm 25 is machined. The worm 25 is supported on the box by tapered roller bearings. The outside of the bearing gland 30 is designed as a sleeve structure. On the one hand, the end of the worm 25 is protected, and on the other hand, the insertion of the adjustment handle 20 is facilitated. refer to Figure 1 to Figure 15 , all the other are with embodiment 1.

Embodiment 3

[0033] In Embodiment 3, the geometric center of the worm wheel 24 and the worm gear case 8 coincides with the geometric center of the hub 19 ; it also coincides with the geometric center of the push plate 18 . The worm gear 24 is supported by two sliding bearings 23, one of which is mounted on the worm gear case 8, and the other sliding bearing is mounted on the worm gear case cover plate 22, and the worm gear case cover plate 22 is positioned in cooperation with the worm gear case 8 through a flange; see Figure 1 to Figure 15 , all the other are with embodiment 1.

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PUM

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Abstract

The invention relates to an external primary adjusting device for blade angles of an axial flow fan, which mainly aims to solve the technical problems that the conventional blade angles of the axial flow fan are difficult to adjust, the conventional adjusting device is complicated in structure and high in cost and the like. The external primary adjusting device has the technical main points that the external primary adjusting device comprises a worm gear case (8), a connecting rod (12), a pin shaft (14), a driving plate (18), a driven plate (27), a wheel hub (19), an adjusting handle (20) and the like. The external primary adjusting device has the characteristics that the external primary adjusting device is igneous in design, novel in structure and low in manufacturing cost, can quickly, accurately and conveniently adjust and can be reliably operated and the like. The external primary adjusting device is mainly applied to large and medium-sized axial flow fans, fan shells are not required to be removed, and the angles of blades (2) can be adjusted externally by means of the adjusting handle (20) and a transmission mechanism, so that the aims of changing performance values of the fans and meeting the requirements of different working conditions are fulfilled.

Description

technical field [0001] The invention relates to an adjusting device, in particular to a blade adjusting device for an axial flow fan. Background technique [0002] Due to the characteristics of large flow, small volume and low pressure head, axial fans are widely used in various ventilation systems that require large flow. It is more common to increase the pressure through multi-stage combination and apply it to the mine ventilation system. In mine ventilation, due to the continuous extension of the roadway and the continuous increase of the excavation face, the working conditions are constantly changing, which requires the performance value of the axial flow fan to continuously adapt to this working condition. There are currently two basic ways to change the performance value of the fan. One is to change the speed of the fan through frequency conversion and speed regulation, and the other is to adjust the angle of the blades to appropriately change the flow and pressure of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/36F04D29/64
Inventor 肖务里贺习平汤武军谢星明陈春平
Owner PINGAN ELECTRICAL