CN2299172Y - Gas/solid wear-resisting centrifugal fan - Google Patents

Abstract

The utility model relates to a gas and solid centrifugal fan mainly aiming at improving the wear-resistant performance of a vane wheel and extending the service life of a fan. The vane wheel of the fan is composed of a blade, a front disc and a rear disc. The utility model has the essential structure that the airflow direction on an inlet of the blade is possibly consistent with an installation angle of the blade, and the angle is normally between 0 DEG and 5 DEG; a line DC of the inlet end of the blade forms a circular arc shape; the load coefficient of a blade passage from the inlet to an outlet needs to adopt a distribution mode which is from a small size to a large size, and the mode is W/Wav (r) =C*(r/r= >O); the work surface of the blade is welded with a plurality of ribs. The fan is applied in the field, such as steel construction material, grain fodder, mechanical petrifaction, etc. to convey airflow containing grains.

Description

Gas-solid two-phase wear-resisting centrifugal fan

The utility model belongs to ventilation plant, relates to the centrifugal blower of gas-solid two-phase.

The Dual-Phrase Distribution of Gas olid blower fan is applied to fields conveyings such as iron and steel building materials, grain feed, mechanical petrochemical industry and contains the particle air-flow.They account for more than 25% of blower fan total amount blower fans such as at present existing steel-making, power generating equipment, cement kiln, waste incineration, industrial steam boiler, industrial dust discharge and conveying material, spread all over national economy all departments.This class blower fan exists efficient low for a long time, the problem that the life-span is short.Draught fan impeller is very easily caused production accident by solid grain wearing and tearing, and frequently ventilating fan stop work and production more causes economic loss.Highway cement factory atmosphere machine only can use 10 days through investigation Benxi, cement plant, Benxi blower fan 1 month, cement plant, Anshan 2 months, cement plant, Handan 3 months, Hangzhou Iron and Steel Factory 3 months, Inner Mongol Wu Da power plant 1 month or the like illustrates that present Dual-Phrase Distribution of Gas olid blower fan is short very outstanding working life, is that people want the problem that solves for a long time.Mainly be in the period of nearest 20 to the wear-resisting centrifugal fan Study on Technology abroad, wherein active with the research collective headed by the Tabakoff again, research contents comprises that the Dual-Phrase Distribution of Gas olid field is calculated, solid grain is in the mechanism of the collision of wall and bounce-back, fret wear.But in design that theoretical study results is used for product and exploitation, but be not reported, aspect the influence of solid grain motion and even erosion of wall, still lack research at nearly wall flow field characteristic.Some wear-resisting blower fan products of external import often are not suitable for domestic running environment and price height; Since the eighties, domestic also the beginning studied, and emphasis is placed upon the improvement of impeller material and the processing of impeller surface, sticks one deck magnetic sheet or plates one deck hard metal as impeller material boronising carburizing, surface.Because subsides, depositing process also do not reach a standard fully, so effect is not fully up to expectations, and this method is a cost to raise the cost; Also having a kind of way is at the blade surface rib of burn-oning, because the rib role is not understood, does not often not only prolong the working life of impeller, and causes the efficient of fan operation to reduce easily, as the blower fan of Inner Mongol Wu Da power plant use; Other has a kind of way is to add the impact energy of small leaf with the solid grain of absorption portion in the blade entrance location, this method is worthy of careful study to choosing very of small leaf angle and form, increased the complexity of technology during production, resleeve trouble more after small leaf grinds off, and not significantly effect of wearing and tearing to alleviating the blade exit position.

The purpose of this utility model is the problem that exists at prior art, under identical draught fan impeller material and blower fan operating conditions, significantly improve Dual-Phrase Distribution of Gas olid draught fan impeller wear-resisting property, prolong blower fan working life and make blower fan have greater efficiency and works fine performance.

Through testing and verification, find that following three aspects can prolong blower fan working life: (1) consumes solid grain impact energy, makes the damage in impeller amount not influence working life; (2) reduce impact number and the number of times of solid grain to impeller; Speed and the collision angle that changes solid when (3) reducing solid collision impeller wall.The position of Dual-Phrase Distribution of Gas olid centrifugal blower fan blade wheel serious wear mainly is following two positions: the import of (1) blade and the binding site of hub disk; (2) binding site of front side of vane outlet and hub disk.

According to a large amount of test practices and theoretical calculation, for realizing that the purpose of this utility model is as follows with reference to the description of drawings technological scheme:

The drawing explanation:

Fig. 1 is the schematic representation that concerns of airflow direction angle, blade inlet place and blade angle;

Fig. 2 is the structural relation schematic representation of blade and shroud and hub disk, 1 expression blade entrance point molded lines among the figure, 2 expression blade exit end molded lines, the 3rd, shroud, the 4th, hub disk;

Fig. 3 is a rib structure schematic representation on the front side of vane;

Fig. 4 is the rib schematic cross-section.

Technical solutions of the utility model as shown in Figure 1, the airflow direction A of blade inlet place is consistent with blade angle, generally controls angle of attack between 0 ° to 5 °, best angle of attack is at 0 °; As shown in Figure 2, change blade entrance point molded lines AB in the conventional design into AC, DC is a circular arc line, and AD is half of AB, and BC is 1/5 to 1/4 with the ratio of BE, the radius R of circular arc DC and impeller outer radius r _oIdentical; Pneumatic design should be taked by little and big distribution mode when determining that the loading coefficient of blade path from import to outlet distributes, and concrete form is: W/Wav (r)=C * (r/r _o) W is the poor of the front side of vane of same radial position and non-working surface overdraught relative velocity in the formula, Wav (r) is the air-flow relative velocity at radial position r place, r represents blade radial position, r _oBe the impeller outer radius, C is that constant gets 2.5～3; Weld rib on front side of vane, as shown in Figure 3, Figure 4, wherein H is required to be 1/50 to 1/45 with the ratio of impeller two blade average distance L, otherwise will reduce fan performance and raise the cost.5 is ribs among Fig. 3, and EF is about 3/4 with the ratio of EB, and EG is about 3/4 with the ratio of EI, and FJ is about 1/4 with the ratio of FK.

Advantage of the present utility model and effect:

(1) is zero because of angle of attack or produces less mill when making solid grain bump impeller near zero degree The damage amount; AB changes AC into because of blade entrance point molded lines, so neither affects fan performance, can increase again The bond strength of strong blade and hub disk, the life time that general impeller prolongs equals the AC line and is ground Become AB line required time. Above-mentioned measure can significantly alleviate blade import and hub disk binding site Wearing and tearing.

(2) owing to rationally determine the distribution of blade path from import to the outlet loading coefficient, energy Speed when reducing the number of times of solid grain collision impeller wall and reducing solid grain collision wall; At leaf The rib of burn-oning on the sheet working face also can reduce the number of times of solid grain collision impeller wall and reduce solid Speed during grain collision wall. Above-mentioned measure can alleviate the front side of vane outlet and be combined with hub disk The wearing and tearing at position.

Claims (5)

1. gas-solid two-phase wear-resisting centrifugal fan, impeller is made up of blade, shroud and hub disk, it is characterized in that the airflow direction A of blade inlet place is consistent with blade angle, gets angle of attack between 0 ° to 5 °: blade entrance point molded lines DC is a circular arc; Blade path is W/Wav (r)=C * (r/r from import to outlet loading coefficient distribution mode _o); On front side of vane, weld rib.

2. wear-resisting centrifugal fan according to claim 1 is characterized in that angle of attack is at 0 °.

3. wear-resisting centrifugal fan according to claim 1 is characterized in that radius R and the impeller outer radius r of circular arc line DC _oIdentical, AD is half of AB, and BC is 1/5 to 1/4 with the ratio of BE.

4. wear-resisting centrifugal fan according to claim 1 is characterized in that constant C gets 2.5～3.

5. wear-resisting centrifugal fan according to claim 1, the H value that it is characterized in that rib on the blade is 1/50 to 1/40 with the ratio of the average distance L of impeller two blades, and EF/EB is 3/4, and EG/EI is 3/4, and FJ/FK is 1/4.

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