執(zhí)行器IC20-30W3T芯科技，芯創(chuàng)新；72701210
當(dāng)負(fù)荷減至1.5Q，將調(diào)速泵轉(zhuǎn)速降低，泵特性曲線變?yōu)閍2，以使給水泵組總揚(yáng)程曲線至a2′。同時(shí)改變給水調(diào)節(jié)閥開度，使管阻特性曲線至b′。此時(shí)運(yùn)行工況點(diǎn)為A，定速泵仍運(yùn)行在B點(diǎn)（即泵的額定運(yùn)行工況點(diǎn)），調(diào)速泵則運(yùn)行于B點(diǎn)，流量為.5Q，壓頭仍為H，這樣在1.5Q的流量下，比前面所說的純定速泵系統(tǒng)節(jié)省了H1－H壓頭差的能耗。假如此時(shí)不調(diào)節(jié)管阻特性曲線，可將原管阻特性曲線向下延長與原單臺(tái)定速泵的特性曲線相交，會(huì)發(fā)現(xiàn)定速泵的負(fù)荷過高，調(diào)速泵只能帶較少的負(fù)荷，這將導(dǎo)致定速泵過負(fù)荷和調(diào)速泵負(fù)荷過小而發(fā)熱、振動(dòng)甚至汽化的不良現(xiàn)象，故當(dāng)有調(diào)速泵時(shí)應(yīng)采取同時(shí)調(diào)節(jié)給水泵特性曲線和管阻特性曲線的方法來達(dá)到調(diào)節(jié)流量的目的。2.32臺(tái)調(diào)速泵并聯(lián)運(yùn)行調(diào)速泵并聯(lián)運(yùn)行時(shí)靠改變調(diào)速泵的轉(zhuǎn)速使揚(yáng)程與流量均滿足鍋爐的要求，這樣既避免了2臺(tái)定速泵并聯(lián)時(shí)，泵在較低流量（額定流量以下）運(yùn)行時(shí)，高揚(yáng)程所帶來的浪費(fèi)；又克服了當(dāng)1臺(tái)鍋爐帶滿負(fù)荷另一臺(tái)鍋爐點(diǎn)火或帶小負(fù)荷時(shí)，1定1調(diào)并列運(yùn)行使定速泵過負(fù)荷，調(diào)速泵負(fù)荷過小對(duì)泵的損傷。保證了機(jī)組的經(jīng)濟(jì)性和安全性。論綜上所述，調(diào)速泵、定速泵并聯(lián)的系統(tǒng)比全為調(diào)速泵的系統(tǒng)節(jié)省了初投資，與全為定速泵的系統(tǒng)相比降低了給水單耗，特別作為供熱機(jī)組，在河北熱電有限責(zé)任公司八期技改工程給水系統(tǒng)中設(shè)置2臺(tái)調(diào)速泵的技術(shù)經(jīng)濟(jì)性較好，以1臺(tái)定速泵作為備用是比較合理的。
ALLEN BRADLEY觸摸屏 2711NL5
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BALLUFF INDUCTIVE SENSOR RPTA 1803-PU-03 *NEW IN BAG*
BALLUFF PROXIMITY SENSOR BES516-3017 BES5163017 E4-C-PU 10-30 V DC 150mA
BALLUFF PROXIMITY SENSOR BES516-3017 BES5163017 E4-C-PU 10-30 V DC 150mA
Balluff Photoelectric Emitter BLS 65K-1-G50-1
Balluff BTL5-M-2814-1S Transducer BTL5M28141S
alluff BTL5-M-2814-1S Transducer BTL5M28141S
Balluff BCSM18KM3-PSC80G-S04G Cap Active 24Vdc Proximity Switch BCSM18KM3 - USED
Balluff BCSM18KM3-PSC80G-S04G Cap Active 24Vdc Proximity Switch BCSM18KM3 - USED
BALLUFF INDUKTIVSENSOR BES 516-370-G-ES-Y-S49 OVP
BALLUFF BES 516-324-G-E4-C-PU-03, INDUCTIVE SENSOR, SENSING RANGE: 2MM, #233488
1 NIB BALLUFF BLS-18K-XX-1J-B1-L2 BLS18KXX1JB1L2 PROXIMITY SWITCH
BALLUFF P/n BES M12EG1-PSC60Z-S04G-S11
Balluff BES 5-6-3008-G-E4-C-PU-05 1.5mm N.O. Inductive Proximity Sensor
BALLUFF BESM12MD1-NSC60B-S04G PROXIMITY SENSOR *NEW IN FACTORY BAG*
BALLUFF BOS 18M-WO-7RB-BO-L PHOTOELECTRIC SENSOR 20-50VAC 45-65HZ
BALLUFF M12 2MM PROXIMITY SENSOR, RXT-1202-PU1 *NEW*
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BALLUFF BES 516-324-G-E4-C-S49-00,2 INDUCTIVE SENSOR 10-30VDC 200MA, NEW #165298
BALLUFF 779685, BNS 542-B02-D12-72-10-FD-L2, Positionsschalter - NEU
BALLUFF BES 516 343-G-E5-C-S49 BES00TY *NEW* PROXIMITY SWITCH 10-30V DC
Balluff BES-516-209-S21-E Sensors
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R900358832 4 WEH 10 D2X/6AG12NETD/5
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R900357750 4 WEH 10 D2X/6AG24N9ETK4/T06
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R900345018 4 WEH 10 D2X/6AG24N9ETZ4
R900387332 4 WEH 10 D2X/6AG24N9ETZ4/11
R900385199 4 WEH 10 D2X/6AG24N9ETZ4/B08
R900337664 4 WEH 10 D2X/6AG24N9ETZ5L
有些零件在工件時(shí)在受扭轉(zhuǎn)和彎曲等交變負(fù)荷、沖擊負(fù)荷的作用下，它的表面層承受著比心部更高的應(yīng)力。在受摩擦的場(chǎng)合，表面層還不斷地被磨損，因此對(duì)一些零件表面層提出高強(qiáng)度、高硬度、高耐磨性和高疲勞極限等要求，只有表面強(qiáng)化才能滿足上述要求。由于表面淬火具有變形小、生產(chǎn)率高等優(yōu)點(diǎn)，因此在生產(chǎn)中應(yīng)用極為廣泛。根據(jù)供熱方式不同，表面淬火主要有感應(yīng)加熱表面淬火、火焰加熱表面淬火、電接觸加熱表面淬火等。感應(yīng)加熱表面淬火感應(yīng)加熱就是利用電磁感應(yīng)在工件內(nèi)產(chǎn)生渦流而將工件進(jìn)行加熱。
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