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Moving blade regulating device for axial flow fan

A technology of axial flow fan and regulating device, which is applied to components of pumping devices for elastic fluids, machines/engines, mechanical equipment, etc., which can solve the problems of low control precision of the rotation angle of moving blades, and achieve simple and reliable operation , Rescue mine safety and ensure the effect of mine safety

Inactive Publication Date: 2012-06-13
ANSHAN FAN GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this structure is that the control accuracy of the blade rotation angle is low

Method used

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  • Moving blade regulating device for axial flow fan
  • Moving blade regulating device for axial flow fan
  • Moving blade regulating device for axial flow fan

Examples

Experimental program
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Embodiment Construction

[0016] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0017] See figure 1 , is a structural schematic diagram of an embodiment of an axial flow ventilation rotor blade adjustment device according to the present invention. This is a single-stage fan rotor blade adjustment device, including a worm wheel 1, a worm screw 2, a lead screw 3, a nut shaft 4, a coupling disc 5 and a gear Bar 6, one end of the nut shaft 4 is coaxially connected with the coupling plate 5 through a nut 11, the other end of the nut shaft 4 is provided with a threaded hole 7 to connect with one end of the lead screw 3, the other end of the lead screw 3 is connected coaxially with the worm wheel 4, and the worm wheel 1 and The worms 2 mesh with each other, and the racks 6 are uniformly arranged on the side of the coupling disc 5. The number of racks 6 is consistent with the number of fan blades 10. The central circle where the rack...

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Abstract

The invention relates to the field of axial flow fans for mines, in particular to a moving blade regulating device for an axial flow fan. The moving blade regulating device for the axial flow fan is characterized by comprising a worm gear, a worm, a screw, a nut shaft, a connecting disc and racks, wherein one end of the nut shaft is coaxially connected with the connecting disc and the other end of the nut shaft has a threaded hole which is connected with one end of the screw; the other end of the screw is coaxially connected with the worm gear; the worm gear is engaged with the worm; the racks are uniformly arranged on the edge of the connecting disc; a central circle where the racks are positioned is coaxial with the connecting disc; a gear is engaged with the racks; and a blade shaft provided with blades is connected with the gear. The effective engaged thread length of the screw and the threaded hole is not less than one half of the circumference of a reference circle of the gear. Compared with the prior art, the device has the advantages that: installation angles of all the blades can be synchronously turned 180 degrees at one time after the fan is shut down, so that the negative air volume of the fan reaches 100 percent of the positive air volume; the device can be simply, conveniently and reliably operated; and the angles can keep stable after the blades are adjusted due to the self-locking characteristics of the worm and the screw, so that the mine safety is reliably guaranteed.

Description

technical field [0001] The invention relates to the field of axial flow fans for mines, in particular to an axial flow ventilation motor blade adjustment device. Background technique [0002] Due to the importance of mine ventilation to safety, my country's coal industry safety regulations stipulate that the reverse air volume of the mine main fan should be greater than 60% of the positive air volume, and the larger the better, but the mine main fans currently produced in my country are all direct Reverse and anti-wind (the fan turns forward and stops immediately and reverses), and it is difficult to meet the requirement that the anti-air volume is not less than 60% of the positive air volume. [0003] In order to improve the anti-air volume of the axial flow fan used in the mine, the existing technologies of the axial flow fan used in the mine mainly include: [0004] 1) Patent Publication No. CN1693717A discloses a fully reversible axial flow fan with a single impeller tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/36F04D29/00
Inventor 李成林
Owner ANSHAN FAN GROUP
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