执行器的原理。
电动执行器的工作原理:执行器由伺服电机、机械减速和位置发送器三部分组成。执行器接受伺服放大器或电动操作器的输出信号,控制伺服电机的正反转,经机械减速器后变成输出力矩去推动调节机构动作。与此同时,位置发送器将调节机构的角位移转换成相对应的4-20mADC信号,作为阀位指示,并反馈到前置磁放大器的输入端作为位置反馈信号以平衡输入信号。
气动执行器的工作原理:气动执行机构接受气动调节器或阀门定位器输出的气压信号,并将其转换成相应的推杆直线位移,以推动调节机构动作。二、执行器的分类及特点。
执行器按其使用的能源形式可以分为气动、电动和液动三大类。
以气动执行机构操作的执行器称为气动执行器或气动调节阀;
以电动执行机构操作的执行器称为电动执行器或电动调节阀;
以液动执行机构操作的执行器称为液动执行器或液动调节阀;
特点:气动执行器具有结构简单、动作可靠稳定、输出力大、安装维修方便、价格便宜和防火防爆等优点,广泛应用于石油、化工、冶金、电力等部门。缺点是滞后大,不适合远传,(传输距离限制在150米以内)。为了克服此缺点可采用电/气转换器或电/气阀门定位器,使传送信号为电信号,现场操作为气动。
电动执行器具有动作快、特别适用于远距离的信号传送、便于和电子计算机配合使用等优点。一般来说,电动执行器不适用于防火防爆的场合。但如果采用防爆结构,也可以达到防火防爆的目的。
Quanta CG Character Generator QCG-304 & QuantaFont
Heller 715A Electronic Component Axial Lead Former
Adtran TSU 600e Modular 1/FT1 Multiplexer PN: 1202076L1
Omron 3G8B2-Z8040 MA010 CS001 NI021 NO020 PS000 PLC Rac
Lightwave Comm / Lantronix VDE / 200 RX 200.00.1100
Insite IG Model 2000 Dual Channel Mixed Liquor Analyzer
Motorola MVME 2600-1 VME Mainframe Processor Board
Ironics IV-1620 VMEbus VME Single Board Computer
Ironics IV-1602 VMEbus VME Single Board Computer
Zenith ATSC Professional Demodulator System DTVDEMOD-S
Severn Trent Capital Control Aztec F1000 Water Monitor
IEC Thermo Electron Model K Heavy Duty Centrifuge
Roldex Industries STF 2 Automatic Cassette Imprinter
VARIAN 3400 GAS CHROMATOGRAPH GC
HEWLETT PACKARD 5995B GC / MS GAS CHROMATOGRAPH
MBM Corp. Fast Fold 22 Jet-Speed Folder FastFold
Precision Filter VMF08 VMF08-F0822-LP1 Octal Filter VME
Precision Filter VMF08 VMF08-F8010/F8100-HP1-M105 VME
Precision Filter VMF08 VMF08-F8011-TD6B Octal Filter
Precision Filter VMF08 VMF08-F8357-TD6B Octal Filter
Precision Filter VMF08 VMF08-F8705-LP1 Octal Filter VME
Ironics IV-3272 PIO Parallel Interface DMA High Speed
VMIC VMIVME-5530S Fiber Optic Slave VMI VMEbus VME5530S
Motorola MVME 147-023 MVME147-023 Single VME Board
Proxima DP2810 True-Color Multimedia Desktop Projector
Adtran HSU600 Modular Multiplexer Dual NX56/64 Module
FISHER SCIENTIFIC 9110 ISOPTEMP CIRCULATOR BATH
Heller 715A Electronic Component Axial Lead Former
Adtran TSU 600e Modular 1/FT1 Multiplexer PN: 1202076L1
Omron 3G8B2-Z8040 MA010 CS001 NI021 NO020 PS000 PLC Rac
Lightwave Comm / Lantronix VDE / 200 RX 200.00.1100
Insite IG Model 2000 Dual Channel Mixed Liquor Analyzer
Motorola MVME 2600-1 VME Mainframe Processor Board
Ironics IV-1620 VMEbus VME Single Board Computer
Ironics IV-1602 VMEbus VME Single Board Computer
Zenith ATSC Professional Demodulator System DTVDEMOD-S
Severn Trent Capital Control Aztec F1000 Water Monitor
IEC Thermo Electron Model K Heavy Duty Centrifuge
Roldex Industries STF 2 Automatic Cassette Imprinter
VARIAN 3400 GAS CHROMATOGRAPH GC
HEWLETT PACKARD 5995B GC / MS GAS CHROMATOGRAPH
MBM Corp. Fast Fold 22 Jet-Speed Folder FastFold
Precision Filter VMF08 VMF08-F0822-LP1 Octal Filter VME
Precision Filter VMF08 VMF08-F8010/F8100-HP1-M105 VME
Precision Filter VMF08 VMF08-F8011-TD6B Octal Filter
Precision Filter VMF08 VMF08-F8357-TD6B Octal Filter
Precision Filter VMF08 VMF08-F8705-LP1 Octal Filter VME
Ironics IV-3272 PIO Parallel Interface DMA High Speed
VMIC VMIVME-5530S Fiber Optic Slave VMI VMEbus VME5530S
Motorola MVME 147-023 MVME147-023 Single VME Board
Proxima DP2810 True-Color Multimedia Desktop Projector
Adtran HSU600 Modular Multiplexer Dual NX56/64 Module
FISHER SCIENTIFIC 9110 ISOPTEMP CIRCULATOR BATH
SORVALL/DUPONT RT6000 REFRIGERATED CENTRIFUGE DU PONT
Cubix Server Subsystem with Cables
VMIC VMIVME-6015 5-CH Multifunction Input/Output Board
Hepco C7600-ACT Dip Lead Cutter
Buehler Phoenix Beta Tabletop 1-Platen Polish Grinder
ASI Astrosystems Durapot HDC34-1/36-24 Transducer
Perkin Elmer Geneamp 2400 PCR System 24-Well ABI GeneAm