External primary whole adjustment device for axial flow fan blade angle

Abstract

The invention discloses an external primary whole adjustment device for an axial flow fan blade angle. The external primary whole adjustment device for the axial flow fan blade angle mainly comprisesa cylinder ring, blade assemblies, crank sliding block assemblies, an impeller hub, a transmission case part, a pushing plate part, a cover plate and an adjusting hand wheel part, wherein the transmission case part comprises a worm wheel, a worm rod and a bearing; the worm wheel meshes with a screw rod fixedly connected with the pushing plate part; a toroidal sliding chute is formed in the edge ofthe pushing plate part; the multiple crank sliding block assemblies are correspondingly connected with the multiple blade assembles; sliding blocks of the crank sliding block assemblies are uniformlydistributed in the toroidal sliding chute and are matched with shaft necks at one ends of crank connecting rods of the crank sliding block assemblies; the other ends of the crank connecting rods areconnected with shaft necks at the end parts of blade handles of the blade assemblies through key pins; shaft necks in the middles of the blade handles are matched with sliding bearings in blade handlesleeves of the blade assemblies; and the end part of the worm rod is connected with the adjusting hand wheel part. The external primary whole adjustment device for the axial flow fan blade angle provided by the invention is simple in structure, light in weight, low in processing accuracy requirement, and easy to install and maintain.

Description

technical field [0001] The invention belongs to an axial flow fan blade angle adjustment device, in particular to an axial flow fan blade angle adjustment device external to a primary integral adjustment device. Background technique [0002] At present, axial flow fans are widely used in mine ventilation systems. 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, and the performance value of the axial flow fan is required to continuously adapt to the changes in the working conditions. 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; the other is to adjust the angle of the blades to appropriately change the flow and pressure of the fan. The first method is rarely used because of the large investment, and the vast majority of mining axial flow ...

AI Technical Summary

Problems solved by technology

[0005] (1) The worm gear box for transmission has a large volume and weight, which has a great influence on the overall quality of the impeller;

[0006] (2) The axial movement of the push plate is realized by setting guide keys on the outer circle of the shaft plate, and this sliding fit is difficult to guarantee due to machining errors;

[0007] (3) The installation of the crank-link mechanism is difficult, and the adjustment is also inconvenient;

[0008] (4) Since the worm wheel is fixed by a sliding bearing, the resistance during movement is relatively large, and the operating force of the rotating handwheel is relatively large;

[0009] (5) The tightness of the worm gear box and the whole device is not high. During operation, the dust and water mist in the flow channel of the fan can easily enter the transmission mechanism. After a long time, it is easy to cause jamming, and even the blades cannot be adjusted;

[0010] (6) When adjusting, the operating handwheel should be inserted into the worm end of the transmission box. The inserted rod has a long depth and poor alignment

[0011] (7) Since the worm gear box is set on the impeller shaft disk, and the fan impellers of different specifications have different shaft disk sizes, therefore, the specifications and models of the worm gear box have poor versatility

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