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泵與風機,pump/fan
1)pump/fan泵與風機
1.The paper bases on performance and characteristics of pump/fan, analyzes the relationship between flow quantity, head, power and rotate speed.根據泵與風機在不同工況下運行的性能與特點,分析了變流量運行時,泵與風機流量、揚程(壓頭)、功率與轉速間的關系。
2.This article presents in theory reasons for the interrelationship between the energy saving benefit of variable speed control of pump/fan and the piping back pressure by analysing the change pattern of working parameters of variable speed control of pump/fan with changing piping back pressure.通過分析泵與風機的變速工況參數隨管路背壓的變化規律 ,從理論上指出了泵與風機變速調節的節能效益與管路背壓大小相關的原因。
3.Theoretically points out the reasons for the interrelation of the energy saving benefit of Variable speed control of pump/fan with the piping back pressure by analysing the regularity of change of the working parameters of variable speed control of pump/fan with piping back pressure.通過分析泵與風機的變速工況參數隨管路背壓的變化規律,從理論上指出了泵與風機變速調節的節能效益與管路背壓大小相關的原因。
英文短句/例句

1.Mood Choices for Starting Water Pump and Blower in Salt Making Industry制鹽工業水泵與風機起動方式的選擇
2.The Simulation Teaching System of Pump and Air Blower Based on 3dsmax and CAXA-solid基于3dsmax和CAXA-solid的泵與風機模擬教學系統
3.Saving Energy and Cleaning Production --On Setting Up the Selective Course of Technology of Energy Saving in Pumps and Fans;節約能源 清潔生產——論選修課《泵與風機節能技術》的開設
4.Create The National Excellent Courses of Distinct Vocational Features--To build " Pump Fan and Fluid Mechanics " courses as an example;打造職業特色鮮明的國家級精品課程——以建設“流體力學泵與風機”課程為例
5.Compare Between Air-cooled Heat Pump and Variable Refrigerant Flow Air-conditioning in the Use of School Office Building風冷熱泵與多聯機在學校辦公樓的應用比較
6.impeller for fans, gas pumps or compressors風扇、氣泵或壓縮機葉輪
7.Research and outlook on electric motor frequency and rotational speed control of fan and water pump風機、水泵類拖動系統電動機變頻調速研究與實踐
8.gas compressors and fans泵(液泵除外)、空氣或其它氣體壓縮機及鼓風機
9.Improvement on cooling-air duct of sluicing pump motor in ash pumphouse灰渣泵房沖洗水泵電動機冷卻風路的改進
10.Research on Energy Saving of Fan and Pump at 420t/h Boiler;420t/h鍋爐風機、水泵節能研究
11.Exploration on the teaching of hydrodynamic pump and fan for high vocational education;高職課程《流體力學泵和風機》教學探討
12.Application of Inverter in Fan and Water Motor Energy Saving Transformation變頻器在風機泵類節能改造中的應用
13.The spray pump should be interlocked with the supply fan.噴水泵應與送風箱相聯鎖。
14.Balance Point Choosing and Thermo Economic Optimization of Air-source Heat Pump;風冷熱泵平衡點選擇與熱經濟學優化
15.Code for construction and acceptance of compressor, fan and pump installation engineering壓縮機、風機、泵安裝工程施工及驗收規范
16.High Efficiency Energy Saving VVCF Method of Operation Motors of Load Fans or Water Pump;風機、水泵類負載電動機的高效節能運行方式
17.Trouble Analysis of the Main Oil Pump in DF4 Type Locomotive and Measures to Prevent東風4型機車主機油泵故障分析及措施
18.Demand of Concrete Pumping Capability and Supply Analysis of Pumping Capability of Concrete Pumps混凝土泵送能力需求與泵送機械的泵送能力供給分析
相關短句/例句

water pump and fan水泵與風機
3)fan and pump風機與水泵
4)pump and fan systems泵與風機系統
5)fluid mechanics & pump and fan流體力學.泵與風機
6)Pump Fan and Fluid Mechanics流體力學泵與風機
1.Create The National Excellent Courses of Distinct Vocational Features——To build " Pump Fan and Fluid Mechanics " courses as an example;打造職業特色鮮明的國家級精品課程——以建設“流體力學泵與風機”課程為例
延伸閱讀

風機泵類電控系統風機泵類電控系統electric drive control system for fan and pump 系統和大功率無換向器電動機拖動系統。 (1)變極對數調速拖動系統.這種系統的控制電路簡單、占地面積小、維護方便、價格低廉,但系有級調速,一般僅有2檔或3檔轉速。如果將此系統與定子調壓或電磁調速電動機結合起來,可以得到既減少轉差損耗,又在相當范圍內平滑調速的較高效率的拖動系統。 (2)串級調速拖動系統。這種系統適用于燒線轉子感應電動機。優點是變流設備容量(轉差功率)小,比其他無級調速方案經濟;缺點是必須使用繞線轉子感應電動機,功率因數低,增加電機損耗,最商轉速降低。現已開發出多種改善功率因數的線路.雙饋電機可克服一般申級調速的一些缺點,但變流和控制復雜、成本高。 (3)變頻調速拖動系統。這是一種理想的拖動系統,且可使用籠型感應電動機(或同步電動機),具有申級調速拖動系統效率高的優點。如采用脈寬調制(PWM)變頻調速,還可提高系統的功率因數和減小諳波。晶體管PWM電壓型交流一直流一交流變頻調速可用于100~200 kw設備,晶閘管電流型交流一直流一交流變頻調速可用于幾百千瓦至2000 kw大型設備。交流一交流直接變頻調速(600r/min以下)可用于幾千千瓦以上的特大型設備(同步電動機).這種拖動系統的控制電路復雜,總投資較高,甚至高達電磁調速電動機的4~5倍。 (4)大功率無換向器電動機拖動系統。大功率無換向器電動機(600r/min以上)也可用于幾千千瓦以上的特大型設備(同步電動機)。某些特大功率(幾萬千瓦)的風機和泵,雖不調速,但需變頗起動裝里,也可用大功率無換向器電動機拖動。 電控系統圖1為典型的雙閉環控制晶閘管串級調速的電控系統原理圖。如果對轉速變化率沒有特殊要求,可以采用開環控制系統,圖2為一泥砂泵的開環控制串級調速電控系統原理圖,電動機采用頻敏變阻器起動,起動后轉變至申級調速,調速由自整角機組成的移相器進行。由于所要求的調速比一般不大于2:1,故串級調速所采用的晶閘管申級裝里的容量一般為電動機功率的30%~50%。圖1閉環控制的串級調速電控系統原理圖圖3為TOSVERT一13oGI變頗調速電控系統原理圖。圖中包括主電路、各種保護配置、調速控制環節。該系統采用大功率晶體管組成的PWM型逆變器和微處理機編程的正弦波PWM控制,電壓和頻率同時在逆變器側加以控制,電流輸出波形近似為正弦波。變頻調速電控系統除上述PWM型外,還有電壓和頻率獨立控制的交流一直流一交流電壓型變頻系統和交流一直流一交流電流型變頻系統。
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