CN101761514A

CN101761514A - Dynamic balance method of boiler fan

Info

Publication number: CN101761514A
Application number: CN200810306529A
Authority: CN
Inventors: 王荣; 曾桂庆; 杨帆
Original assignee: Aluminum Corp of China Ltd
Current assignee: Aluminum Corp of China Ltd
Priority date: 2008-12-25
Filing date: 2008-12-25
Publication date: 2010-06-30

Abstract

The invention discloses a dynamic balance method of a boiler fan, comprising the following steps: firstly, trying to find counterweight positioning and drilling by a vane impeller, namely, positioning three points in an angle of 120 degrees with each other at the circumferential edge of the vane impeller in the positions, respectively marking as points A, B and C, and respectively drilling a hole of Phi 12mm; secondly, preparing three assembling screws of Phi 10, weighing the weight thereof and recording; thirdly, assembling a screw on the points A, B and C for three times according to the sequence of A-C, wherein one screw is assembled for each time, respectively starting the fan for three times to obtain three groups of vibration values in the horizontal and vertical directions; fourthly, utilizing CAD to construct, obtaining the position needing to add counterweight; and fifthly, welding the counterweight firmly according to the obtained results for trial run. The invention has the following advantages: 1, the welding times and labor intensity of fitters are reduced in the dynamic balance process; 2,the working is more standardized and the operational practicability is strong; and 3, the time is greatly shortened.

Description

Dynamic balance method of boiler fan

Technical field

The present invention relates to a kind of boiler fan impeller dynamic balance method.

Background technique

In recent years, Chalco Guizhou branch company thermoelectricity plant was along with the expand production needs of increase-volume of aluminium oxide, and boiler accessory machinery is more and more, and fan vibration in service is handled also frequent all the more, and dynamic balancing day by day increases as a kind of effective means utilization of handling vibration.According to the statistics in 08 year 1～May, handled fan vibration 4～6 times in every month substantially.Traditional dynamic balancing is effective really, but needs the time longer, and general each processing needs 2～3 hours, and this transmission or not therebetween will delay the plenty of time, and for continuous production process, production loss is great.

The technical problem to be solved in the present invention is: a kind of boiler fan impeller dynamic balance method is provided, and this method can reduce staff labor intensity, shorten the time that dynamic balancing is handled, to overcome the deficiency that prior art exists.

The present invention takes following technological scheme: according to the dynamically balanced principle of blower fan, at first, impeller examination looks for counterweight location and boring.At the circumferential edges of impeller, the direction that is mutually 120 ° is located 3 points, and we are labeled as A, B, C point to them respectively, and each bores the hole of Ф 12mm, prepares three couplings and looks for dynamically balanced Ф 10 assembling screws to get final product.Secondly, weigh up the weight of a Ф 10 assembling screws, perform record; Three, according to the order of A～C on A, B, C point minutes three times, assemble a screw at a point at every turn, start the tertiary air machine respectively, draw the vibration values (vibration velocity, amplitude all can) of three groups of levels, Vertical direction, perform record; Four, required counterweight and position (angle, the orientation) of adding can be fast obtained in utilization CAD mapping; The 5th, weld the counterweight test run according to the calculation result and get final product.

The present invention compared with prior art has following advantage: 1. reduce the welding times in the dynamic balancing process and the labor intensity of pincers worker.Weldering in the past four times only needs weldering 1 time now; Pincers worker only need be assembled bolt three times, locatees simple to operate saving time at last.2. operation standardization more can be operated practical.The counterweight standardization is looked in examination, because Ф 10 assembling screws are standard piece, counterweight is fixed; 3 examinations look for balance position to fix, and are difficult for makeing mistakes; 3. the time shortens greatly.Looked for the dynamically balanced time in the past about 3 hours at every turn, wherein have time of 2/3 be consume blower fan stop sending on the electricity, the present invention only needs get final product at blower fan manhole door place assembling screw, so first three time need not to cut off the power supply, save the link of in the past stopping to send electricity greatly, thereby saved time.

Description of drawings

Fig. 1 looks for counterweight reconnaissance schematic representation for draught fan impeller dynamic balancing examination of the present invention.

Fig. 2 implements dynamic balancing, uses CAD to ask calculation counterweight and position view the 5# induced draught fan for utilizing the present invention.Among the figure: Ф 18, φ 25, φ 35 are respectively assembling and focus on three test run vibration values (seeing embodiment's table 1); Determine the center 01 of equilateral triangle: cross three circles and make equilateral triangle, make two vertical lines again and promptly determine the center, purpose is to determine that institute adds the position and the calculating counterweight of counterweight; Add the position of counterweight and calculate counterweight: angle is the B point to C point deviation angle for 40 °; Institute adds counterweight M=12.33/5.35*0.315=0.725kg;

Fig. 3 implements dynamically balanced draught fan impeller bore position schematic representation for utilizing the present invention to the 5# induced draught fan.

Embodiment

Embodiments of the invention: on May 5th, 2008 the 5# induced draught fan is implemented dynamic balancing is example.It comprises following process: at first, and location and boring.According to the dynamically balanced principle of blower fan, at the circumferential edges of impeller, the direction that is mutually 120 ° is located 3 points, sees shown in Figure 1ly, and 3 are labeled as A, B, C point respectively, and each bores the hole of Ф 12mm, prepares three couplings and looks for dynamically balanced Ф 10 assembling screws.Secondly, weigh up the weight of a Ф 10 assembling screws, comprise screw rod, nut and all be weighed as 0.315kg (kilogram), perform record, look for the counterweight calculated value as examination; Three, according to the order of A～C on A, B, C point minutes three times, assemble a screw at a point at every turn, start the tertiary air machine respectively, draw the vibration values (vibration velocity, amplitude all can) of three groups of levels, Vertical direction, see Table 1, perform record; Four, required counterweight and position (angle, the orientation) of adding can be fast obtained in utilization CAD mapping, sees Fig. 2, Fig. 3.This example obtain be first point (A point) to inclined to one side 40 ° of second point (B point), counterweight is tried to achieve 0.725kg (4.5kg cuts off the counterweight of looking for static balancing to draw on the original impeller among Fig. 3 after 4 counterweights); Final dynamic balancing adds counterweight 0.725kg (M=12.33/5.35*0.315=0.725kg); The 5th, weld the counterweight test run according to the calculation result and get final product, the test run value is qualified, and its level, vertical amplitude vibration values are respectively 0.03mm, 0.02mm.

The table 1 5# draught fan impeller dynamic balancing vibration values time: on May 5th, 08

Put	Horizontal vibration amplitude (mm)	Vertical amplitude (mm)
Put	Horizontal vibration amplitude (mm)	Vertical amplitude (mm)	??A	??9	??/
??B	??12.5	??/	??A	??9	??/
??B	??12.5	??/	??C	??17.5	??/

Utilization CAD mapping asks required method or the step that adds counterweight and position as follows:

1, sees Fig. 2 according to table 1 three concentric circles that draw;

2, determine the position of counterweight: determine the equilateral triangle center earlier: cross three circles and make equilateral triangle, and make two vertical lines and determine the center of equilateral triangle (some O ₁), connect the center of circle (some O) and get line OO ₁, at CAD acceptance of the bid outlet OO ₁With three summits to the center the distance (O ₁A) and line O ₁A and OO ₁40 ° of angles, this angle is the required angle (being the B point toward inclined to one side 40 ° of C point) that adds counterweight;

3, calculate institute according to figure two and add counterweight M=12.33 (line OO ₁Distance) ÷ 5.35 (distance of OA) * 0.315 (looking for the bolt weight of counterweight)=0.725kg.

4,4.5kg is looked for added counterweight after the static balancing after four of the counterweights among Fig. 2 by impeller dynamic balancing before cutting off adds.

Claims

1. boiler fan impeller dynamic balance method, it is characterized in that: it comprises following process: at first, counterweight location and boring are looked in impeller examination, promptly locate 3 points in the circumferential edges of impeller, the direction that is mutually 120 °, be labeled as A, B, C point respectively, each bores the hole of Φ 12mm; Secondly, prepare three Φ, 10 assembling screws, and weighed amount, perform record; The 3rd, according to the order of A～C on A, B, C point minutes three times, assemble a screw at a point at every turn, start the tertiary air machine respectively, draw the vibration values of three groups of levels, Vertical direction, perform record; Four, required counterweight and the position of adding obtained in utilization CAD mapping; The 5th, according to the result who is obtained counterweight is welded and to get final product test run.

2. boiler fan impeller dynamic balance method according to claim 1 is characterized in that: utilization CAD mapping asks the method for required counterweight and position as follows: at first, draw level, vertical vibration amplitude three concentric circles that draw according to three test runs; Secondly, determine the position of counterweight, cross equilateral triangle summit of three concentric circles works and be labeled as E, F, G respectively, and draw, determine the mid point O1 of equilateral triangle; The 3rd, the mid point O1 and the concentrically ringed mid point O of connection equilateral triangle; Mark the promptly minimum interior round round dot place, equilateral triangle summit and the angle of two mid point lines again, this angle is the required angle that adds counterweight; This sentences smallest point is reference point.