CN112065783A

CN112065783A - Ultra-low noise meridian acceleration axial flow fan

Info

Publication number: CN112065783A
Application number: CN202011095734.4A
Authority: CN
Inventors: 丁亮; 李卉; 周翔; 郑楠帧
Original assignee: 704th Research Institute of CSIC
Current assignee: 704th Research Institute of CSIC
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2020-12-11

Abstract

The invention relates to an ultra-low noise meridian acceleration axial flow fan, which comprises a diffusion cylinder provided with blades and a current collector provided with guide vanes, wherein the front of the current collector is connected with the diffusion cylinder, the current collector and the diffusion cylinder adopt a trapezoidal shell structure capable of pumping leakage flow at the tops of the blades, and the inner diameter of the diffusion cylinder in the trapezoidal shell structure is larger than that of the current collector. The rear part of the current collector is internally provided with a built-in motor through a motor shell, a guide vane is arranged outside the motor shell, and a shaft of the built-in motor is connected with the blade and the fairing through a hub. The invention adopts the trapezoidal casing structure to suck the leakage flow at the blade top, can effectively reduce the negative influence of airflow blocking clusters in the area at the blade top, further enlarge the stall margin of the fan and reduce the noise. The motor structure can obviously reduce noise and has obvious noise reduction effect.

Description

Ultra-low noise meridian acceleration axial flow fan

Technical Field

The invention relates to an axial flow fan, in particular to an axial flow fan capable of accelerating at noon.

Background

In the current ship field, the ventilator plays a great role in the aspects of ventilation, air exchange, dust removal, heating, conveying flammable and explosive gases and the like, and is one of important devices of a ship auxiliary guarantee system. However, the existing marine ventilator generally has the problems of old structure, low efficiency and the like, particularly, the centrifugal ventilator has a large volume ratio, and except the noise generated by the centrifugal ventilator, the marine ventilator interacts and interferes with various surrounding marine parts in the case of a marine field with a small space, so that the noise generation is intensified. This can be a major detriment to the stability of the ventilator apparatus and the health of the field worker. At present, a silencer and some sound insulation means are commonly added in a common noise reduction method, but extra equipment of a ventilator is increased and economic investment is increased, so that the structural improvement of the ventilator to achieve the purpose of noise reduction is very important.

The existing axial flow fan end wall area causes the blade tip leakage and generates leakage vortex due to the gap between the blade tip and the casing surface, and the leakage vortex reduces the fan performance on one hand, and simultaneously greatly increases the noise due to the gap between the blade tip and the casing surface.

Disclosure of Invention

The invention aims to provide an ultra-low noise meridian acceleration axial flow fan aiming at the defects of the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides an axial fan is accelerated to ultralow noise midnight-noon, is including the diffusion section of thick bamboo that is equipped with the blade and the collector that is equipped with the stator, the preceding connection of collector expands a section of thick bamboo, but collector and diffusion section of thick bamboo adopt the trapezoidal shell structure of suction tip leakage flow, diffusion section of thick bamboo internal diameter is greater than in the trapezoidal shell structure the internal diameter of collector.

Furthermore, a built-in motor is installed in the rear portion of the current collector through a motor shell, guide vanes are arranged outside the motor shell, and a shaft of the built-in motor is connected with the blades and the fairing through a hub.

Further, a motor rear cover connected with the motor shell is arranged at the rear end of the built-in motor.

Further, the ultra-low noise meridian acceleration axial flow fan is connected with the rear support through the rear end of the current collector.

The invention has the beneficial effects that:

compared with similar products, the product provided by the invention has the advantages that the sound level is ultralow than that of A, the rated design point is 18, the sound level is far lower than that of an axial flow series fan, and the sound level of the similar products is usually more than 30.

Drawings

FIG. 1 is a schematic view of an ultra-low noise meridian acceleration axial flow fan of the present invention;

fig. 2 is a partial enlarged view of fig. 1 at I.

Detailed Description

The invention is further described with reference to the following figures and examples.

As shown in fig. 1 and 2, the meridional acceleration axial flow fan of the present invention includes: the device comprises a fairing 1, blades 2, guide vanes 3, a built-in motor 4, a rear support 5, a motor rear cover 6, a motor shell 7, a diffuser 8, a current collector 9 and a hub 10. The front of the current collector 9 is provided with a pressure expansion cylinder 8, the rear part of the current collector 9 is internally provided with a built-in motor 4 through a motor shell 7, the rear end of the built-in motor 4 is provided with a motor rear cover 6 connected with the motor shell 7, a guide vane 3 is arranged outside the motor shell 7, and the shaft of the built-in motor 4 is connected with a blade 2 and a fairing 1 through a hub 10. The whole ultra-low noise meridian acceleration axial flow fan is connected with the rear support 5 through the rear end of the current collector 9.

(1) The invention adopts a trapezoidal casing structure between the collector 9 and the diffuser 8, as shown in fig. 1 and 2. The end wall area of the axial flow fan is provided with a gap between the blade top and the casing surface, so that a part of air flow crosses the gap between the blade top to cause blade top leakage and generate leakage vortex under the action of pressure difference between the pressure surface and the suction surface of the blade, the vortex reduces the performance of the fan on one hand, and simultaneously, the existence of the gap between the blade top greatly increases noise. The adoption of the trapezoidal casing structure can suck the leakage flow at the top of the blade, effectively reduce the negative influence of airflow blocking clusters in the area at the top of the blade, further enlarge the stall margin of the fan and reduce the noise.

(2) The other structural characteristic of the invention lies in that the motor is arranged in the rear-mounted mode, and the motor is sleeved in the rear diversion cone when the motor is arranged in the front-mounted mode or the rear-mounted mode is adopted by a common fan, so that the adverse effect caused by the structure is that the motor is sleeved in the diversion cone and is not beneficial to the heat dissipation of the motor, and the electromagnetic noise generated by the motor interacts with the inner wall of the rear diversion cone to aggravate the noise generation, so that the noise reduction difficulty of the fan is further increased. The motor structure can obviously reduce noise and has obvious noise reduction effect.

(3) The structure of the rear guide cone has certain influence on the noise of the fan, the reasonable guide cone structure can effectively improve the vortex structure of the tail flow field of the diagonal fan, reduce tail backflow and flow loss, and the fan performance can be obviously improved by verifying the flat-top rear guide cone, so that the noise is reduced.

Claims

1. The utility model provides an axial fan is accelerated to ultralow noise midnight-noon, is including the current collector that is equipped with the diffusion section of thick bamboo of blade and is equipped with the stator, the preceding diffusion section of thick bamboo of connecting in current collector, its characterized in that: the collector and the diffusion cylinder adopt a trapezoidal casing structure capable of pumping leakage flow at the blade top, and the inner diameter of the diffusion cylinder in the trapezoidal casing structure is larger than that of the collector.

2. The ultra-low noise meridional acceleration axial fan of claim 1, wherein: the rear part of the current collector is internally provided with a built-in motor through a motor shell, a guide vane is arranged outside the motor shell, and a shaft of the built-in motor is connected with the blade and the fairing through a hub.

3. The ultra-low noise meridional acceleration axial fan of claim 2, wherein: and the rear end of the built-in motor is provided with a motor rear cover connected with the motor shell.

4. The ultra-low noise meridional acceleration axial fan of claim 1, wherein: the ultra-low noise meridian acceleration axial flow fan is connected with the rear support through the rear end of the current collector.