風機選型的基本知識:
1、標準狀態(tài):指風機的進口處空氣的壓力P=101325Pa,溫度t=20℃,相對濕度φ=50%的氣體狀態(tài)。
2、指定狀態(tài):指風機特指的進氣狀況。其中包括當?shù)卮髿鈮毫虍數(shù)氐暮0胃叨?,進口氣體的壓力、進口氣體的溫度以及進口氣體的成份和體積百分比濃度。
3、風機流量及流量系數(shù)
3.1、流量:是指單位時間內(nèi)流過風機進口處的氣體容積。 用Q表示,通常單位:m3/h或m3/min。
3.2、流量系數(shù):φ=Q/(900πD22×U2) 式中:φ:流量系數(shù) Q:流量,m3/h D2:葉輪直徑,m U2:葉輪外緣線速度,m/s(u2=πD2n/60)
4、風機全壓及全壓系數(shù):
4.1、風機全壓:風機出口截面上的總壓與進口截面上的總壓之差。用PtF表示,常用單位:Pa
4.2、全壓系數(shù):ψt=KpPtF/ρU22 式中, ψt:全壓系數(shù) Kp:壓縮性修正系數(shù) PtF:風機全壓,Pa ρ:風機進口氣體密度,Kg/m^3 u2:葉輪外緣線速度,m/s
5、風機動壓:風機出口截面上氣體的動能所表征的壓力,用Pd表示。常用單位:Pa
6、風機靜壓:風機的全壓減去風機的動壓,用Pj表示。常用單位:Pa
7、風機全壓、靜壓、動壓間的關系: 風機的全壓(PtF)=風機的靜壓(Pj)+風機的動壓(Pd)
8、風機進口處氣體的密度:氣體的密度是指單位容積氣體的質(zhì)量,用ρ表示,常用單位:Kg/m3
9、風機進口處氣體的密度計算式: ρ=P/RT 式中:P:進口處絕對壓力,Pa R:氣體常數(shù),J/Kg·K。與氣體的種類及氣體的組成成份有關。 T:進口氣體的開氏溫度,K。與攝氏溫度之間的關系:T=273+t
10、標準狀態(tài)與指定狀態(tài)主要參數(shù)間換算:
10.1、流量:ρQ=ρ0Q0 10.2、全壓:PtF/ρ= PtF0/ρ0 10.3、內(nèi)功率:Ni/ρ= Ni0/ρ0 注:式中帶底標“0”的為標準狀態(tài)下的參數(shù),不帶底標的為指定狀態(tài)下的參數(shù)。
11、風機比轉(zhuǎn)速計算式: Ns=5.54 n Q01/2/(KpPtF0)3/4 式中: Ns:風機的比轉(zhuǎn)速,重要的設計參數(shù),相似風機的比轉(zhuǎn)速均相同。 n:風機主軸轉(zhuǎn)速,r/min Q0:標準狀態(tài)下風機進口處的流量,m3/s Kp: 壓縮性修正系數(shù) PtF0: 標準狀態(tài)下風機全壓,Pa
12、壓縮性修正系數(shù)的計算式: Kp=k/(k-1)×[(1+p/P)(k-1)/k-1]×(PtF/P)-1 式中:PtF:指定狀態(tài)下風機進口處的絕對壓力,Pa k:氣體指數(shù),對于空氣,K=1.4
13、風機葉輪直徑計算式: D2=(27/n)×[KpPtF0/(2ρ0ψt )]1/2 式中:D2:葉輪外緣直徑,m n:主軸轉(zhuǎn)速:r/min Kp:壓縮性修正系數(shù) PtF0:標準狀態(tài)下風機全壓,單位:Pa ρ0:標準狀態(tài)下風機進口處氣體的密度:Kg/m3 ψt:風機的全壓系數(shù)
14、管網(wǎng):是指與風機聯(lián)接在一起的,氣流流經(jīng)的通風管道以及管道上所有附件的總稱。
15、管網(wǎng)阻力的計算式:Rj=KQ2 式中: Rj:管網(wǎng)靜阻力,Pa K:管網(wǎng)特性系數(shù)與管道長度、附件種類、多少等因素有關,確定其值的方法通常采用:計算法,類比法和實際測定法。 Q:風機的流量,m3/s
16、常見壓力單位間的換算關系: 1毫米水柱(mmH2O)=9.807帕(Pa)
17、大氣壓力與海撥高度間近似關系: P=101325-(9.4~11.2)H 式中:P:大氣壓力Pa H:海撥高度:m
風機型號大全:
LG4-12 LY4-12 W4-57 4-68 4-68 4-68 4-68 4-68 4-68 4-68 4-68 4-68 4-68 4-68 4-68 4-68 B4-68 G4-68 G4-68 G4-68 G4-68 G4-68 G4-68 G4-68 Y4-68 Y4-68 Y4-68 Y4-68 Y4-68 Y4-68 Y4-68 Y4-68 Y4-68 Y4-68 4-72 4-72 4-72 4-72 4-72 4-72 4-72 4-72 4-72 4-72 4-72 4-72 4-72 4-72 4-72 B4-72 B4-72 B4-72 B4-72 B4-72 B4-72 B4-72 B4-72 B4-72 B4-72 B4-72 B4-72 B4-72 B4-72 F4-72 F4-72 F4-72 F4-72 F4-72 F4-72 F4-72 F4-72 F4-72 F4-72 6nbsp; 4-72 4-72 4-72 4-72 4-72 B4-72 B4-72 B4-72 B4-72 B4-72 B4-72 B4-72 B4-72 B4-72 B4-72 B4-72 B4-72 B4-72 B4-72 F4-72 F4-72 F4-72 F4-72 F4-72 F4-72 F4-72 F4-72 F4-72 F4-72 F4-72 T4-72 T4-72 T4-72 T4-72 C4-73 C4-73 C4-73 G4-73 G4-73 G4-73 G4-73 G4-73 G4-73 G4-73 G4-73 G4-73 G4-73 G4-73 G4-73 G4-73 W4-73 W4-73 W4-73 Y4-73 Y4-73 Y4-73 Y4-73 Y4-73 Y4-73 Y4-73 Y4-73 Y4-73 Y4-73 Y4-73 Y4-73 Y4-73 Y4-73 Y4-73 Y4-73 Y4-73 B4-73 Y4-73-14 4-79 4-79 4-2*79 5-29 5-29 5-29 5-29 MQ5-54 MQ5-54 MQ5-54 MQ5-54 Y5-47 Y5-47 Y5-47 Y5-47 Y5-47 Y5-47 Y5-47 Y5-47 Y5-47 Y5-47 Y5-47 Y5-47 Y5-47 Y5-47 Y5-48 Y5-48 Y5-48 Y5-48 Y5-48 Y5-48 Y5-48 Y5-48 Y5-48 Y5-48 Y5-48 Y5-48 5-48 G5-50 G5-50 G5-50 G5-50 G5-50 G5-50 G5-50 Y5-50 Y5-50 Y5-50 Y5-50 Y5-50 Y5-50 5-51 5-51 LG6-12 LY6-12 6-23 6-27 6-30 6-30 6-30 6-30 6-30 6-30 6-30 6-30 Y6-30 F6-30 G6-41 G6-41 G6-41 G6-41 G6-41 Y6-41 Y6-41 Y6-41 Y6-41 Y6-41 Y6-41 Y6-41 Y6-41 Y6-41 Y6-41 G6-45 YS6-45 6-46 6-46 6-46 6-46 6-46 6-46 6-46 6-46 6-46-13 C6-48 C6-48 C6-48 C6-48 C6-48 C6-48 G6-48 Y6-48 Y6-48 G6-51 Y6-51 Y6-51 Y6-51 LY7-12(LY10-12) M7-29 M7-29 M7-29 G7-36 Y7-36 Y7-36 Y7-36 Y7-36 Y7-36 Y7-36 Y7-36 8-09 9-12 9-12 9-12 9-12 9-19 9-19 9-19 9-19 9-19 9-19 9-19 9-19-11 9-19-11 9-19-11 9-19-11 9-19-11 9-19-11 9-19-11 9-19-11 9-19-11 9-19-11 9-19-11 9-19-11 9-19-11 9-19-11 9-16 9-16 9-16 9-19-12 9-19-12 B9-19 B9-19 B9-19 B9-19 B9-19 B9-19 B9-19 B9-19 B9-19 B9-19 B9-19 B9-19 B9-19 Y9-19 Y9-19 9-26 9-26-11 9-26-11 9-26-11 9-26-11 9-26-11 9-26-11 9-26-11 9-26-11 9-26-11 9-26-11 9-26-11 9-26-11 9-26-11 9-26-11 9-26-11 9-26-11 9-26-11 9-26-12 9-26-12 B9-26 B9-26 B9-26 B9-26 B9-26 B9-26 B9-26 B9-26 B9-26 M9-26 M9-26 M9-26 M9-26 M9-26 M9-26 Y9-26 9-28-11 9-28-11 9-28-11 9-28-11 9-28-11 9-28-11 9-28-11 9-28-11 9-28-11 9-28-11 9-28-11 9-28-11 9-28-11 9-28-11 9-28-11 9-28-11 9-28-12 9-35 9-35 Y9-35 Y9-35 YX9-35 YX9-35 9-38 Y9-38(Y8-39) Y9-38(Y8-39) Y9-38(Y8-39) Y9-38(Y8-39) Y9-38(Y8-39) Y9-38(Y8-39) Y9-38(Y8-39) Y9-38(Y8-39) Y9-38(Y8-39) Y9-38(Y8-39) Y9-38(Y8-39) Y9-38(Y8-39) Y9-38(Y8-39) LG10-12 LG10-13 Y10-19 Y10-21 Y10-21 Y10-24 Y10-24 LG15-12 LY15-12 LY15-14 LG20-12 LY20-12 LY25-12 LG25-12 LG35-12 LG40-12 LY40-12 YG4 YG6 LG75 LY75 LY75 LY75 LG75 LG75 LG75 LG75 LG75 SNL-11 SNL-11 SNL-11 SNL-11
糧食專用: 4-72-13 AI MQ100-1100 ZHY726-0600 ZHY726-0600 RC RC DZ DZ DZ DZ T30-11 T30-11 T30-11 T30-11 T30-11 T30-11 T30-11 T30-11 BT30-11 BT30-11 BT30-11 BT30-11 BT30-11 BT30-11 BT30-11 BT30-11 BT301 BT301 BT301 BT301 BT301 BT301 BT301 T301 T301 T301 T301 T301 T301 T301 T301 T301 T301 T301 T301 T301-12 T35-11 T35-11 T35-11 T35-11 T35-11 T35-11 T35-11 T35-11 T35-11 T35-11 T35-11 T35-11 T35-11 BT35-11 BT35-11 BT35-11 BT35-11 BT35-11 BT35-11 BT35-11 BT35-11 BT35-11 BT35-11 BT35-11 BT35-11 T40 T40 T40 T40 T40 T40 T40 T40 BT40 BT40 BT40 BT40 BT40 BT40 BT40 BT40
干燥通風風機: 30 E2 038-12 038-11 SWF-1 FZ40-11 FZ40-11 XQI XQI BWQ BDW87-3 BDW87-3 BDW87-3 BDW87-3 BDW87-3 BDW87-3 BDW87-3 BDW87-3 BDW87-3 BDW87-3 BDW87-3 WS85-6 WS85-6 WS85-6 WS85-6 WS85-6 WS85-6 WS85-6 FT301 FT301 FT301 FT301 FT301 FT35 FT35 FT35 FT35 FT35 FT35 FT35 FT35 FT35 FT35 FT35 FT35 FT35 LYT40-14 LYT40-14 LYT40-14 LYT40-14 LYT40-14 LYT40-14 LYT40-14 LYT40-14 LYT40-14
羅茨鼓風機: D22*21 D22*32 D36*35 D36*60 R60*48 R60*63 R60*78 R60*90 L41 L42 L43 L51 L52 L53 L54 L61 L62 L63 L73 L81 L82 L83 L84 L93 L94 HTL3-2A HTL3-2A HTL3-2A LZSR-50 LZSR-65 LZSR-80 LZSR-100 &n
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