CN206439231U - A kind of new and effective backward centrifugal fan - Google Patents

Abstract

The utility model discloses the new and effective backward centrifugal fan of one kind, including casing, casing is provided with central shaft hole and air outlet, it is less than the central rotating shaft of central shaft hole in central shaft hole provided with diameter, central rotating shaft is connected with motor and impeller, impeller is located in casing and is connected with casing both sides, and snail tongue shape is V-shaped to be set, and impeller includes the blade set in distortion formula；The beneficial effects of the utility model are：It is reasonable in design, it is simple in construction, noise pollution can be effectively reduced, and also operating efficiency is higher, and service life is higher, and blade is single plate structure, and manufacturing cost simple in construction is low.

Description

A kind of new and effective backward centrifugal fan

Technical field

The utility model belongs to field of ventilation equipment, and in particular to be a kind of new and effective backward centrifugal fan.

Background technology

Ventilation blower is the mechanical energy by input, improves gas pressure and supplies gas side by side the machinery of body, it is a kind of driven Fluid machinery.

Ventilation blower is widely used in the ventilation of factory, mine, tunnel, cooling tower, vehicle, ship and building, dust discharge and cold But；The ventilation of boiler and industrial furnace and air inducing；Cooling and ventilation in the apparatus of air conditioning and domestic electric appliance；Cereal Dry and select and recommend；Inflation and propulsion of wind-tunnel wind regime and aircushion vehicle etc..

The operation principle of ventilation blower and turbocompressor are essentially identical, only because gas flow rate is relatively low, pressure change is not Greatly, the change typically without the concern for gas specific volume, i.e., handled using gas as incompressible fluid.

The relation of ventilation blower and blower fan：Blower fan is custom abbreviation of the China to gas compression and gas conveying machinery, generally Described blower fan includes ventilation blower, air blower, compressor and Roots blower, but not including that piston compressor isometric(al) formula Air blower and compressor.Ventilation blower is a kind of product type of blower fan, but people generally ventilation machine barrel for blower fan, both divulged information Machine is another call of blower fan.

And the nest tongue of existing ventilation blower is straight panel, cause that noise is larger, noise pollution is than more serious and existing Ventilation blower on blade be generally that straight panel or bent plate are set, when in use, blast is not high enough, so that less efficient.

Utility model content

The technical problems to be solved in the utility model is to provide a kind of being capable of noise-decreasing pollution, increase service life , carry efficient backward centrifugal fan.

To achieve the above object, the technical solution adopted in the utility model is, a kind of new and effective backward centrifugal fan, Its structural feature is, including casing, and casing is provided with central shaft hole and air outlet, central shaft hole is less than central shaft provided with diameter The central rotating shaft in hole, central rotating shaft is connected with motor and impeller, and impeller is located in casing and is connected with casing both sides, impeller and casing Both sides junction is snail tongue, and snail tongue shape is V-shaped to be set, and impeller includes the blade set in distortion formula.

As preferred scheme of the present utility model, impeller includes lobus sinister room and lobus dexter room, set between lobus sinister room and lobus dexter room There is demarcation strip.

As preferred scheme of the present utility model, the circle being coaxially disposed with central rotating shaft is equipped with lobus sinister room and lobus dexter room Ring, the diameter of annulus is less than the diameter of impeller.

As preferred scheme of the present utility model, blade is located on annulus, and the plane of blade and annulus is vertically arranged, blade With annulus only one of which intersection point.

As preferred scheme of the present utility model, blade is several, and several blades are set around annulus circular array.

As preferred scheme of the present utility model, blade and the connection end of lobus sinister room and lobus dexter room are provided with reinforcement.

As preferred scheme of the present utility model, blade is obliquely installed in obtuse angle with central rotating shaft.

The beneficial effects of the utility model are：It is reasonable in design, it is simple in construction, noise pollution can be effectively reduced, and Operating efficiency is higher, and service life is higher, so as to reduce use cost.

Brief description of the drawings

Fig. 1 is structural representation of the present utility model；

Wherein, 1- casings.2- central shaft holes, 3- goes out doorway, and 4- central rotating shafts, 5- motors, 6- impellers, 7- blades, 8- is left Leaf chamber, 9- lobus dexter room, 10- demarcation strips, 11- annulus.

Embodiment

Explanation is further explained to the utility model below in conjunction with the accompanying drawings, but does not limit protection model of the present utility model Enclose.

As shown in figure 1, a kind of new and effective backward centrifugal fan, including casing 1, casing 1 is provided with the He of central shaft hole 2 It is less than the central rotating shaft 4 of central shaft hole 2 in air outlet 3, central shaft hole 2 provided with diameter, central rotating shaft 4 is connected with motor 5 and leaf Wheel 6, impeller 6 is located in casing 1 and is connected with the both sides of casing 1, and impeller 6 is snail tongue with the both sides junction of casing 1, and snail tongue shape is in " V " shape is set, and impeller 6 includes the blade 7 set in torque arm formula.

Described impeller 6 includes lobus sinister room 8 and lobus dexter room 9, and demarcation strip 10 is provided between lobus sinister room 8 and lobus dexter room 9.

Be equipped with the annulus 11 being coaxially disposed with central rotating shaft 4 in described lobus sinister room 8 and lobus dexter room 9, annulus 11 it is straight Footpath is less than the diameter of impeller 6.

Described blade 7 is located on annulus 11, and the plane of blade 7 and annulus 11 is vertically arranged, and blade 7 only has with annulus 11 One intersection point.

Described blade 7 is several, and several blades 7 are set around the circular array of annulus 11.

Described blade 7 and the connection end of lobus sinister room 8 and lobus dexter room 9 are provided with reinforcement；Blade 7 can be made more firm.

Described blade 7 is obliquely installed in obtuse angle with central rotating shaft 4.

Impeller 6 is the critical piece of ventilation blower, and its geometry, size, lobe numbers and the accuracy of manufacture has to performance Very big influence.Impeller 6 just can guarantee that ventilation blower is smoothly rotated through static balance or dynamic balance calibration.Press the Way out of blade 7 Difference, 6 points of impeller is forward direction, radial direction and backward three kinds of patterns.The top of blade 7 of forward direction impeller is tilted to impeller direction of rotation； The top of blade 7 of radial impeller is, to radial direction, prismatic blade formula and shaped form blade to be divided again；And pass through technology of the present utility model The ventilation blower that scheme is obtained is backward centrifugal fan.

The utility model is not limited to above-mentioned preferred embodiment, it is every have with utility model it is same or similar as Technical scheme, belongs to protection domain of the present utility model.

Claims (7)

1. a kind of new and effective backward centrifugal fan, it is characterised in that：Including casing, casing is provided with central shaft hole and air-out Mouthful, it is less than the central rotating shaft of central shaft hole in central shaft hole provided with diameter, central rotating shaft is connected with motor and impeller, and impeller is located at It is connected in casing with casing both sides, impeller is snail tongue with casing both sides junction, snail tongue shape is V-shaped to be set, and impeller includes The blade set in distortion formula.

2. the new and effective backward centrifugal fan of one kind according to claim 1, it is characterised in that：Described impeller includes Lobus sinister room and lobus dexter room, are provided with demarcation strip between lobus sinister room and lobus dexter room.

3. the new and effective backward centrifugal fan of one kind according to claim 2, it is characterised in that：Described lobus sinister room and The annulus being coaxially disposed with central rotating shaft is equipped with lobus dexter room, the diameter of annulus is less than the diameter of impeller.

4. the new and effective backward centrifugal fan of one kind according to claim 1, it is characterised in that：Described blade is located at On annulus, the plane of blade and annulus is vertically arranged, blade and annulus only one of which intersection point.

5. the new and effective backward centrifugal fan of one kind according to claim 4, it is characterised in that：Described blade is number Individual, several blades are set around annulus circular array.

6. the new and effective backward centrifugal fan of one kind according to claim 1, it is characterised in that：Described blade and a left side The connection end of leaf chamber and lobus dexter room is provided with reinforcement.

7. the new and effective backward centrifugal fan of one kind according to claim 1, it is characterised in that：Described blade is with Heart rotating shaft is obliquely installed in obtuse angle.