CN1508485A - Induced fan - Google Patents

Abstract

The invention discloses a kind of guiding fan for ventilation in large location, the structure comprises chassis, snoot with variable angles, there sets electricity machine and cross-flow blade wheel connecting to the output shaft at the side of the chassis, its shaft direction corresponds to the shaft of the snoot. There has a guiding volute on the inner wall of chassis back of the blade wheel, there has a countercurrent resisting volute tongue, when the electricity machine drives the blade wheel to rotate, the air enters form the back of the chassis, through guiding volute, countercurrent resisting volute tongue and snoot, it uses high speed air to guide air to the fixed direction and region.

Description

Induced fan

One, technical field

The present invention relates to a kind of blower fan, especially a kind of Induced fan when being used for parking lot, gymnasium, hall, workshop and other large-scale place ventilation and air conditioning.

Two, background technology

Spraying the induced draught air exchange system is made up of pressure fan, Induced fan, exhaust blower, measuring and controlling equipment four parts.Wherein pressure fan is to be used for supplying with outdoor fresh air, and several the Induced fans of Pai Lieing are induced into the fresh air tissue in the garage through the relay of one-level one-level at regular intervals, stirs, and simultaneously the waste gas tissue is induced to the exhaust blower place and discharges; Measuring and controlling equipment then is that the said equipment is also opened or close to exhaust gas concentration automatically in the sensing storehouse.

Power supply and operation control: every Induced fan all has power wiring seat and indicator lamp; The control mode that can take has: the automatic control of CO sensing, the time programming automatic control is with fire prevention zone interlock control, kinds such as hand switch control.Carry out with give, the exhaust blower coordinated operation.

Spray shown in inductive ventilation system scavenging way plane, the elevational schematic view as Fig. 4 and Fig. 5, in the parking lot as arrow direction air-supply and air draft, W is the automobile Vomitory.

A) ventilation in parking lot

The parking lot is semi-enclosed place, there is harmful pollutant, as the vehicle exhaust of dust, stagnation and oil vapour etc., the purpose of ventilation is that pernicious gas (CO, NOx gas, contain formaldehyde and plumbous gas, be main object with carbon monoxide CO gas generally) will be diluted to below the permissible value by design.

The State Bureau of Technical Supervision and the Ministry of Construction unite issue " garage, freight car temporary repairing shed, parking lot design fire safety rules " GB50067-97, and standard code: garage such as improper ventilation gather oil vapour easily and set off an explosion.

The CO gas that produces when vehicle motor startup, idling influences the health of staff in the storehouse, and hygiene department's regulation garage rate of ventilation is per hour 6-10 time.

B) the straight injection stream inductive ventilation system in parking lot

The parking lot utilizes installs several injection Induced fans through multistage relay, arrive the direction and zone of appointment with a large amount of air of Gas Jet inducing peripheral that penetrate at a high speed, need not use airduct, various pernicious gases and oil vapour can be discharged, simultaneously fresh air be delivered to interior each place.

C) accessory system of heating and air-conditioning

Workshop, gymnasium, hall etc. have tall and big ceiling to hinder air circulation, make evenly to heat or to be cooled to optimum temperature very difficult.Straight injection stream Induced fan can pass through induced orientation transporting cold wind, hot blast, deliver to the zone of appointment as required, and form organized indoor air flows, and make indoor temperature distribution even, air quality improves, especially during winter heating, the energy consumption that large space exists is excessive, heats up slowly low top, building temperature bottom height, after straight injection stream Induced fan was induced stirring, above-mentioned problems can obtain fine solution.

The blower fan of above-mentioned ventilation usefulness adopts the plain edition Induced fan usually, though better action is arranged, its structure is the blower fan of front multi-wing centrifugal impeller, thereby its overall structure height is bigger, and the plain edition Induced fan has the advantages that static pressure is big, flow is little.The static pressure that ventilation blower produces mainly is to be used for overcoming resistance of pipe system to carry air, and the characteristics of Induced fan and use occasion are no pipelines, therefore the static pressure of its generation just becomes loss in efficiency, its flow is little, and mainly to embody air stream outlet speed low, range is near, and therefore the air amount of inducing that produces is also little.

Three, utility model content

The objective of the invention is to provide a kind of improved Induced fan,, dwindle its structure height, improve dynamic pressure and produce the bigger air amount of inducing to overcome the deficiency of above-mentioned common Induced fan.

For achieving the above object, solution of the present invention is: a kind of Induced fan, comprise cabinet, it is characterized in that: the front end of described cabinet is fixed with the nozzle that can adjust various spray angles, be fixed with motor and direct connection in the side of cabinet on its output shaft and the cross-flow type impeller that in cabinet, extends, its axis direction is perpendicular to the axis of nozzle, the back side of this cross-flow type impeller is provided with the water conservancy diversion spiral case that is fixed on the cabinet inwall, and the front side of this cross-flow type impeller is provided with the anti-adverse current snail tongue that is fixed on the cabinet inwall; The described nozzle that is fixed on the cabinet front end is provided with more than one.

After adopting such scheme, the present invention compared with prior art has following beneficial effect: Induced fan of the present invention is to adopt the cross-flow type impeller, claim it is tubular impeller again, and common Induced fan is to adopt the forward multiple wing centrifugal impeller, because this structural difference, Induced fan of the present invention is thinner, than existing various types of Induced fan height less than the 50-100 millimeter.Therefore be used in the same building design, building room height can reduce the 50-100 millimeter, and saves the building cost of corresponding floor height.

Induced fan of the present invention is compared with common Induced fan, owing to adopt the cross-flow type blade wheel structure, its maximum characteristics are that dynamic pressure is higher, and air-flow disorderly, can obtain the high velocity air than high thrust, and the air-flow reach is not longer.The air amount of inducing that is produced is also big, can reduce the platform number when selecting for use with area, economizes on resources.

The air-flow of Induced fan of the present invention can be ejected by the circular spout of the nozzle of particular design by nozzle, and the gas tissue can be organized into comparatively ideal state behind anterior diffusion current stabilization, is convenient in design is used more accurate type selecting and determines requirement.

Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.

Four, description of drawings

Fig. 1 is the structural representation of Induced fan of the present invention;

Fig. 2 is that the A of Fig. 1 is to view;

Fig. 3 is an Induced fan operation principle schematic diagram of the present invention;

Fig. 4 sprays inductive ventilation system scavenging way floor map;

Fig. 5 sprays inductive ventilation system scavenging way elevational schematic view.

Five, the specific embodiment

As depicted in figs. 1 and 2, the structure of the new Induced fan of this practicality comprises cabinet 5, front end at cabinet 5 is fixed with the nozzle 1 that can adjust various spray angles, be fixed with motor 6 and direct connection in the side of cabinet 5 in the cross-flow type impeller that extends on its output shaft and in cabinet 5, its axis direction is perpendicular to the axis of nozzle 1, and the axis of this nozzle 1 is the direction of air-flow ejection, and nozzle 1 is set to more than one, can form by single or multiple, can adjust multiple spray angle as required.This cross-flow type impeller 3 claims tubular impeller again, and the side is provided with the water conservancy diversion spiral case 4 that is fixed on cabinet 5 inwalls thereafter.The front side side of this cross-flow type impeller 3 is provided with the anti-adverse current snail tongue 2 that is fixed on cabinet 5 inwalls.Above-mentioned motor 6 can adopt single-phase 220V motor or three-phase 380V motor, in order to cross-flow type impeller 3 rotations of drive with its direct connection, air is sucked by cabinet 5 back square channels, and at water conservancy diversion spiral case 4 water conservancy diversion, under the anti-adverse current effect of anti-adverse current snail tongue 2, twice by cross-flow type impeller 3, behind cabinet 5 anterior diffusion current stabilizations, from being fixed on the single or multiple nozzles 1 that can adjust various spray angles of cabinet 5 fronts, with certain flow, the direction and zone of appointment are arrived in thrust output with a large amount of air of Gas Jet inducing peripheral that penetrate at a high speed.

The operation principle of Induced fan of the present invention is:

Machine was when being applied to parking lot, gymnasium, hall, workshop and other large-scale place ventilation and air conditioning in this was induced, basic functional principle is that isothermal is freely justified turbulent jet theory and the theoretical principle of combined action of turbulent flow wall attachment jet, and follows principle of conservation of momentum.

The Induced fan characteristic as shown in Figure 3, the angle β 0 between the center line of nozzle 1 and ceiling 10 planes is called established angle.Air is after nozzle 1 penetrates, and under the effect of thrust that blower fan produces and inertia force, jet will remain original flow direction, travel forward.Because momentum-exchange, jet exit velocity begins to reduce gradually to the axle center from the boundary layer, and jet axis speed keeps that constant section of muzzle velocity V0, is called The initial segment, and conical section ADE is a jet core; The cross section BAC that jet core disappears is transition face, and P is called main paragraph afterwards.Because the turbulent mixing of jet and entrainment effect, make air and surrounding air generation momentum-exchange on the boundary line of jet, static on every side air constantly is involved in jet, and the scope of jet and flow are constantly increased along with the prolongation of range.The steam flow bundle of jet exit ejection, outside and surrounding air friction, the speed that makes reduces, and simultaneously continuous inducing peripheral air movement enters air flow stream inside, and the air flow stream internal speed also reduces gradually.The speed of jet-stream wind reduces gradually like this, induced by air-flow and the air capacity of moving is increasing, plays the air-guiding direction and stirs the effect of surrounding air.

The line m of the null point of effluxvelocity cries the boundary line of jet.Space shape such as cone that the boundary line m of jet surrounds.The semiapex angle α of circular cone is called polar angle.

When the interior space of building is enough big, and when not having obstacle to stop, the air-flow bottom of nozzle ejection belongs to isothermal jet, and top belongs to wall attachment jet because of the reason part f of ceiling 10, is suitable for principle of conservation of momentum.Can simply be stated as: motion air momentum conservation on the section parallel with jet.

Be the constant ρ Q0V0=of the product ρ Q1V1 of air quantity and speed.

Claims (4)

1, a kind of Induced fan, comprise cabinet (5), it is characterized in that: the front end of described cabinet (5) is fixed with the nozzle (1) that can adjust various spray angles, be fixed with motor (6) and direct connection in the side of cabinet (5) in the cross-flow type impeller (3) that extends on its output shaft and in cabinet (5), its axis direction is perpendicular to the axis of nozzle (1), the back side of this cross-flow type impeller (3) is provided with the water conservancy diversion spiral case (4) that is fixed on cabinet (5) inwall, and the front side of this cross-flow type impeller (3) is provided with the anti-adverse current snail tongue (2) that is fixed on cabinet (5) inwall.

2, a kind of Induced fan according to claim 1 is characterized in that: the described nozzle (1) that is fixed on cabinet (5) front end is provided with more than one.

3, a kind of Induced fan according to claim 1 is characterized in that: described motor (6) is single-phase 220V motor.

4, a kind of Induced fan according to claim 1 is characterized in that: described motor (6) is a three-phase 380V motor.

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