CN201475038U

CN201475038U - Fully-mixed flow impeller

Info

Publication number: CN201475038U
Application number: CN200920209076XU
Authority: CN
Inventors: 张劲戈
Original assignee: Shanghai Nautilus General Equipment Manufacturing Co Ltd
Current assignee: Shanghai Nautilus General Equipment Manufacturing Co Ltd
Priority date: 2009-09-03
Filing date: 2009-09-03
Publication date: 2010-05-19
Anticipated expiration: 2019-09-03

Abstract

The utility model relates to a fully-mixed flow impeller, which is an important component of a mixed-flow fan and can be widely applied to industrial and civil projects, such as fire control and smoke discharge, common air supply and exhaust of high-rise buildings, strong air exhaust of high-rise tenements, underground garages, subways, smoke discharge of subways and tunnels, intensive air supply of air pipes and other occasions. The fully-mixed flow impeller is formed by fixing a front disk, a wheel hub and blades; the inner edges of the blades are fixed on the wheel hub along the circumferential direction and the outer edges of the blades are fixed inside the front disk so as to form a closed structure, wherein the front disk is a frustum-shaped front disk with a small front part and a large rear part. By the frustum-shaped front disk and straight-plate blades, the air current direction can be changed for two times; the frustum-shaped front disk can effectively lead air current and avoid air current loss to maximum extent; the size between the impeller and a side shell is reduced, so the loss caused by the change of the transmission direction of the air current can be avoided; and the protruded front disk and the impeller are precisely matched so as to shield part of pneumatic noise.

Description

The complete mixing flow impeller

Technical field

The utility model relates to a kind of complete mixing flow impeller, vitals for mixed flow fan, can be widely used in the industrial civilian project, as fire-fighting smoke evacuation, the common supply and exhaust of tall building, the powerful air draft of high-rise building, underground parking garage, the smoke evacuation in subway and tunnel, airduct are concentrated occasions such as air-supply.

Background technique

Mixed flow fan combines the feature of axial flow and centrifugal fan, although it seems more as traditional axial fan.Wind stress factor is than axial-flow blower height, and flow coefficient is bigger than centrifugal blower.Mainly be made of shell, collection air port, setting rotary blade in the enclosure, impeller is driven by power mechanism and driving mechanism.

Crooked plate vane is welded on the conical steel wheel hub.Change flow by the blade angle that changes in the inlet shell of impeller upstream.

Casing can have unlimited inlet, but more common situation is that it has the right-angle bending shape, makes motor can be placed on the pipeline outside.Drain shell and slowly expand, slowing down the speed of air or gas flow, and kinetic energy is converted to useful static pressure.

The function of rotary blade is to make air obtain energy; The function of shell is to collect air, and the dynamic pressure of air is converted into static pressure effectively.

Mixed flow fan generally is used for common supply and exhaust, the fire-fighting smoke evacuation of big air quantity, high static pressure, the occasion of double speed smoke evacuation, can horizontal base ground, abutment wall installation, lifting, air duct install, also can supporting use blast cap, filter screen replaces the roof ventilator supply and exhaust.

Present more common common flow-mixing blower fan be used for occasions such as fire-fighting smoke evacuation, but still there is shortcoming in it aspect structure, the efficient:

1, impeller directly links to each other with the noise reduction orifice plate, causes air intake to have some setbacks like this, and static pressure efficiency is on the low side;

2, the triangle zone at blade and orifice plate can produce turbulent flow, causes windage loss and noise;

3, impeller and avris shell sizes spacing are bigger than normal, the reverse transmission of air-flow meeting like this, shown in the air flow direction schematic representation of the generation eddy current of the common mixed flow impeller of Fig. 4, air-flow enters from collecting the air port, because of the impeller plate and avris shell sizes spacing bigger than normal, cause the reverse transmission of air-flow, produce eddy current, thereby cause windage loss.

Therefore, the efficient that above-mentioned common flow-mixing blower fan exists is not high in order to overcome, energy waste, noise shortcoming bigger than normal, specially proposes new technological scheme.

Summary of the invention

Technical problem to be solved in the utility model is: a kind of complete mixing flow impeller of new structure is provided, solves the shortcoming that the windage loss of conventional mixed flow form impeller is big, static pressure efficiency is low, noise is big.

The utility model solves the problems of the technologies described above the technological scheme of being taked: a kind of complete mixing flow impeller, interfix by shroud, wheel hub and blade and to form, the interior edge of described blade along the circumferential direction is fixed on the wheel hub, the outer is fixed on the inboard of shroud, constitute closed type structure, wherein, described shroud is pre-small post-large taper type shroud.

Adopted to the utility model innovation the taper type shroud, it can be come over and pledged allegiance to air-flow effectively, avoids windage loss, has reduced aerodynamic noise, improved static pressure efficiency and be difficult for overload, under identical rotating speed, reduce energy loss, improve axial-flow blower static pressure and centrifugal blower air quantity.Owing to adopt conical entrance, between the taper type shroud, form the closed area, need not to make extra baffle plate, economical with materials.

On the basis of such scheme, described blade is the straight-plate-type blade.

On the basis of such scheme, described shroud, wheel hub and blade be closely welding formation one mutually, the precision-fit of shroud and blade, the aerodynamic noise of maskable part.

On the basis of such scheme, described taper type shroud is through the integrated structure of prod cast drawing craft.

The beneficial effects of the utility model are:

By taper type shroud and straight-plate-type blade, gently change airflow direction twice, the taper type shroud is steering flow effectively, farthest avoid windage loss, and the size between impeller and avris shell reduces, avoid air-flow to change the direction transmission and cause damage, outstanding shroud and impeller precision-fit, the aerodynamic noise of maskable part.

Description of drawings

Fig. 1 is a main TV structure schematic representation of the present utility model.

Fig. 2 is a side-looking structural representation of the present utility model.

Fig. 3 is the utility model air flow direction schematic representation in the enclosure.

Fig. 4 is the air flow direction schematic representation that common mixed flow impeller produces eddy current.

Label declaration in the accompanying drawing

1-shroud 2-wheel hub 3-blade

Embodiment

Seeing also Fig. 1 is that main TV structure schematic representation of the present utility model and Fig. 2 are shown in the side-looking structural representation of the present utility model, a kind of complete mixing flow impeller, constitute one by the tight mutually welding of shroud 1, wheel hub 2 and blade 3, wherein, the interior edge of described blade 3 along the circumferential direction is fixed on the wheel hub 2, and the outer is fixed on the inboard of shroud 1, constitute closed type structure, wherein, described shroud 1 is pre-small post-large taper shroud 1, and described blade 2 is a straight-plate-type blade 2.

Described taper shroud 1 is the structure through prod cast drawing craft shaping one.

Working principle of the present utility model is:

1, seeing also Fig. 3 is air flow direction schematic representation of the present utility model, and air-flow enters from collecting the air port, discharges reposefully along the taper type shroud.

2, with the air flow direction schematic representation of the generation eddy current of the common mixed flow impeller of Fig. 4 relatively, size is little between hub disk of the present utility model and avris shell, avoids the reverse transmission of air-flow to produce eddy current, the raising static pressure efficiency.

3, taper type shroud and blade cooperate, and have shielded the noise that part produces owing to air motion.

Claims

1. complete mixing flow impeller, being interfixed by shroud, wheel hub and blade forms, and it is characterized in that: the interior edge of described blade along the circumferential direction is fixed on the wheel hub, the outer is fixed on the inboard of shroud, constitute closed type structure, wherein, described shroud is pre-small post-large taper type shroud.

2. complete mixing flow impeller according to claim 1 is characterized in that: described blade is the straight-plate-type blade.

3. complete mixing flow impeller according to claim 1 is characterized in that: described shroud, wheel hub and blade be closely welding formation one mutually.

4. according to claim 1 or 3 described complete mixing flow impellers, it is characterized in that: described taper type shroud is through the integrated structure of prod cast drawing craft.