CN2115419U

CN2115419U - S-shape vane centrifugal ventilator

Info

Publication number: CN2115419U
Application number: CN 91226133
Authority: CN
Inventors: 陈德洪
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-10-03
Filing date: 1991-10-03
Publication date: 1992-09-09

Abstract

The utility model provides an S-shaped vane centrifugal ventilator which is reformed on the basis of the existing ventilator. The utility model is characterized in that the vane of an impeller forms an S shape, namely that the vane of the inlet part of a vane channel is bent backwards and the vane of the outlet part of the vane channel is bent forwards. The utility model has the advantages of high wind pressure output by the ventilator, high internal efficiency and power saving.

Description

S-shape vane centrifugal ventilator

The utility model relates to dust discharge, the centrifugal fan of ventilation usefulness.

Existing centrifugal fan mainly contains intake grill, impeller, worm gear, retainer and motor and forms.And impeller mainly is made of the multi-disc blade of shroud, hub disk and welding therebetween.According to the difference of blade exit setting angle, mainly divide forward direction impeller and back to impeller.

Fig. 1, a are the structural representations of forward direction impeller, and the exit installation angle degree β of the blade of this impeller is greater than 90 °.Because blade is antecurvature, and is big to the energy of gas effect, so the blast height of forward direction fan impeller output., as the Ye Daoshi of gas flow path forward direction impeller, be not easy to be consistent because air-flow enters the established angle of the blade inlet at the direction angle of relative velocity in leaf road and this place, boundary layer separation takes place through the leaf road in gas stream easily, produces eddy current; Cause the gas flow drag losses big therefrom, therefore, the internal efficiency of forward direction fan impeller is low, takes.Fig. 1, b are the structural representation of back to impeller.The exit installation angle β of the blade of this impeller is less than 90 °.Because the blade palintrope is less relatively to the energy of gas effect, therefore, the back is lower to the blast of fan impeller output.But, when gas stream through after to the Ye Daoshi of impeller be consistent easily because air-flow enters direction angle and this place's blade inlet established angle of the relative velocity in leaf road, therefore, gas stream is not easy to take place boundary layer separation through this leaf road, be not easy to produce eddy current, the gas flow drag losses is little; Therefore, the back is to internal efficiency height, the power saving of fan impeller.And in the engineering, usually require the blast height of blower fan output, require the internal efficiency height of blower fan, power saving again.

The purpose of this utility model is that a kind of S type blade centrifugal blower will be provided, and it can guarantee both discharge pressure of fan height of blower fan, internal efficiency height again, power saving.

The purpose of this utility model is to realize like this.On the basis of existing centrifugal blower structure, only change the blade shape of impeller.The blade shape of leaf road intake section is similar to the blade of impeller with the back, i.e. the blade palintrope.And it is similar, promptly antecurvature in the shape of the leaf road of the blade shape of leaf road exit portion and forward direction impeller outlet blade.Whole blade is similar to " S " type.

The utility model is on the basis of existing centrifugal fan, only changes blade shape and realizes, and is therefore simple in structure, do not increase manufacture difficulty.As the Ye Daoshi of gas stream through this S type blade impeller, gas enters the direction angle of relative velocity in leaf road and the inlet established angle of this place's blade is consistent easily, and gas stream is not easy to take place boundary layer separation through the leaf road, promptly be not easy to produce eddy current, mobile drag losses is little; Therefore, the internal efficiency height of this S type blade centrifugal blower, power saving.In addition, the leaf road exit portion of S type blade impeller, blade is antecurvature shape, and is big to the energy of gas effect, therefore the blast height of output.

Fig. 2 is blade wheel structure figure of the present utility model.

S type blade centrifugal blower includes intake grill, impeller, spiral case, retainer, motor composition.Blade 1 is welded between shroud 2 and the hub disk 3, and each blade is pressed the circumference of hub disk 3 by number of blade five equilibrium, evenly arranges.Reel 5 and hub disk 3 usefulness rivets 4 are riveted into one.Form leaf road 6 between per two blades, air-flow is by flowing outside the garden along the leaf road in the circle.

Feature of the present utility model is, by in the circle to circumference, convex arc R1 on the 3/4L of length of blade L length is, this section arc is the palintrope shape with respect to the sense of rotation of impeller.Beginning exit point A to blade from the flex point B of the 3/4L length of blade arc of blade, is concave arc R2 down, and this section arc is antecurvature shape with respect to the impeller sense of rotation.The tangent line of ordering at A in tangent line that arc R2 is ordered at A and impeller outer garden, the blade exit of the impeller that intersects is installed β.The angle value of its β, with more than or equal to 55 °, the scope that is less than or equal to 90 ° is advisable, and helps improving the blast of output.

Claims

1, the S type blade centrifugal blower that provides of the utility model includes: intake grill, impeller, spiral case, retainer, motor are formed.The blade 1 of impeller is welded between shroud 2 and the hub disk 3, and each blade is pressed the garden week of hub disk 3 by number of blade five equilibrium, evenly arranges;

Feature of the present utility model is: interior outside circle by circle, in the 3/4L of length of blade L length is the lonely R1 of epirelief, the sense of rotation of the relative impeller of this section orphan is the palintrope shape, flex point B from the 3/4L length of blade orphan of blade, exit point A to blade is recessed lonely R2, this section orphan is antecurvature shape with respect to the impeller sense of rotation, the tangent line that tangent line that lonely R2 is ordered at A and impeller cylindrical are ordered at A, the exit installation angle β of the impeller blade that intersects, the angle value of its β, more than or equal to 55 °, be less than or equal to 90 ° scope.