CN2105580U

CN2105580U - High-temp. axial-flow fan

Info

Publication number: CN2105580U
Application number: CN 91215661
Authority: CN
Inventors: 任世瑶; 徐灿根; 任勇; 罗建平
Original assignee: Shanghai Jiaotong University
Current assignee: Shanghai Jiaotong University
Priority date: 1991-07-06
Filing date: 1991-07-06
Publication date: 1992-05-27

Abstract

The utility model relates to a high-temp. axial-flow fan which belongs to the heating, ventilating and fume discharging device of the field of fluid machinery. The impeller of the utility model adopts an axial-flow type. An electrical machine is arranged in a small air cylinder which forms a cylinder shape. The inner wall of the small air cylinder is painted with high-temperature-resistant coating, and both ends of the small air cylinder are sealed with cover caps which can be welded with a cold air sucking pipe and a cold air discharging pipe. The external cold air can be sucked in from the cold air sucking pipe and can be discharged out of the casing of the high-temp. axial-flow fan after flowing through the inner cavity of the small air cylinder. Or the external cold air can flow to the sucking inlet of a main impeller through small holes of the cover cap place, and can pass the main impeller to flow out together with main air flow. The utility model has the advantages of compact structure, convenient installation, no transmission loss of belts and low manufacturing cost, and can normally run in the environment with high temperature, high humidity and strong corrosivity.

Description

High-temp. axial-flow fan

High-temperature axial flow fan is the heating ventilator fire-fighting smoke exhaust equipment that belongs in the field of fluid machinery.

The common shaft flow fan only is applicable to the normal temperature air of carrying cleaning clean both at home and abroad at present, its medium temperature generally should be lower than 45 ℃, to be blower fan only allow to move being not more than under 40 ℃ the ambient temperature with motor (E class B insulation) its main cause, otherwise can have a strong impact on electrical machinery life.As 8 meters blower fans of high temperature cooling tower original diameter, its motor is in tower, and electrical machinery life is just very short.In high temperature fire-fighting purging system, can't solve owing to the high temperature resistant problem of motor in the past, so there is not the axial flow smoke exhaust fan of compact dimensions always, in China's fire protection rule, have to the only accurate centrifugal fan that uses of regulation, adopt centrifugal fan (motor outside), make bulkyly, in tall building, can't install.And for example the mint is with the air bells exhauster on the dryer; its medium temperature is near 100 ℃; motor can only be contained in outside the blower fan air duct; use belt transmission,, adorn shielding can (whole chain cover on the similar bicycle) again in order to protect belt; so not only transmission loss is big; and runner is seriously blocked, influence fan efficiency, cause the waste of the material energy.Other because the medium temperature height also has to use centrifugal fan usually, perhaps uses the axial fan of motor beyond casing as other gas fan of oven and boiler induced-draft fan.

The purpose of this utility model is for the axial-flow blower that adopts E class B insulation motor normally being moved in high temperature, high pressure, corrosive medium, prolonging its working life.

Content of the present utility model is, draught fan impeller is an axial flow, the motor direct connection drives, motor is installed in the little air duct, but brushing high-temperature resistant coating on little air duct inwall, little air duct is cylindrical, two ends envelope has cover cap, be welded with cool air suction pipe and discharge tube near the cover cap of the left and right sides respectively, cool ambient air is by air intake pipe, by the cooling fan suction of motor left end, the little air duct inner chamber of flowing through, discharge outside the fan casing by the air discharge tube, or flow into axial flow fan vane wheel suction port place, then through impeller, flow out with main air flow, this fan motor is the conventional motor of E class B insulation.

Fig. 1 is the high rotating speed high-temperature axial flow fan first embodiment structure principle chart;

Fig. 2 is the high rotating speed high-temperature axial flow fan second embodiment structure principle chart;

Fig. 3 is a slow-speed of revolution low noise high-temperature axial flow fan structure principle chart.

1 is air intake pipe among the figure, the 2nd, and little air duct, the 3rd, main impeller, the 4th, cooling fan, the 5th, motor, the 6th, air discharge tube, the 7th, flow blower casing, the 8th, aperture.

In conjunction with the accompanying drawings, concrete enforcement of the present utility model is:

Blower fan main impeller 3 is an axial flow, and it and motor 5 direct connections drive, and motor 5 is installed in the little air duct 2, brushing high-temperature resistant coating on little air duct 2 inwalls, and little air duct is cylindrical, and two ends envelope has cover cap.

To high rotating speed high-temperature axial flow fan, can near little air duct 2 left cover caps, be welded with air intake pipe 1, near right cover cap, be welded with air discharge tube 6, cooling fan 4 is installed in the left end of motor 5.Normal temperature air can pass through air intake pipe 1, by cooling fan 4 suctions of motor 5 left ends, behind little air duct 2 inner chambers of flowing through, is discharged outside the fan casings 7 by air discharge tube 6.(see figure 1).This class formation blower fan, its motor 5 mounting points are unrestricted, can be installed in main impeller 3 suction sides, also can be contained in main impeller 3 exhaust ends.

To high rotating speed high-temperature axial flow fan, also air discharge tube 6 can be installed, and have several apertures 8 at right cover cap place, the air behind little air duct 2 inner chambers of flowing through enters the suction side of main impeller 3 by right cover cap place aperture 8, discharges (see figure 2) with main air flow then.

To the slow-speed of revolution, low noise high-temperature axial flow fan, because of rotating speed is low, small-sized cooling fan is difficult to the air quantity that provides required, can cancel cooling fan for this reason, and near left cover cap, be welded with a pair of cool air suction pipe 1, the place opens several apertures 8 at right cover cap, utilizes main impeller 3 suction pressures to be lower than atmospheric pressure, has the characteristics of pressure reduction, ambient air is flowed freely into, through too small air duct 2 inner chambers, enter the suction side of main impeller 3 by right cover cap place aperture 8, discharge (see figure 3) with main air flow then.

According to the use occasion requirement, main impeller 3 and fan casing 7 can spray fluorine and mould.

This high temperature modification axial-flow blower compact dimensions, easy for installation, floor space is little, utilizes the conventional motor of E class B insulation, can normally operation under the strong environment of high temperature, high humidity, corrosivity, cost is low, the life-span is long.This axial-flow blower is applied on the high temperature smoke exhaust fan, the centrifugal blower volume that regulation adopts on the blower fan volume ratio fire protection rule greatly reduces, no belt transmission loss, and air flow losses in blower fan are little, the pneumatic efficiency height, energy efficient, and motor is installed in the little air duct, electromagnetic noise is low, has tangible economic benefit and social benefit.

Claims

1, a kind of high temperature modification axial-flow blower that drives by main impeller 3 and motor 5 direct connections, it is characterized in that motor 5 is installed in the little air duct 2, little air duct 2 is cylindrical, little air duct 2 two ends envelope has cover cap, be welded with air intake pipe 1 near little air duct 2 left cover caps, be welded with air discharge tube 6 near right cover cap, cooling fan 4 is installed in motor 5 left ends, motor 5 can be installed in main impeller 3 suction sides, also can be contained in main impeller 3 exhaust ends.

2, by the described high temperature modification axial-flow blower of claim 1, it is characterized in that the place has several apertures 8 at right cover cap.

By the described high temperature modification axial-flow blower of claim 1, it is characterized in that 3, be welded with a pair of air intake pipe 1 near little air duct 2 left cover caps, the place has several apertures 8 at right cover cap.

4, by claim 1 or 2 or 3 described high-temperature axial flow fans, it is characterized in that, little air duct 2 inwall brushing high-temperature resistant coatings, main impeller 3 and fan casing 7 spraying fluorine are moulded.