混(hun)(hun)流(liu)泵(beng)(beng)(beng)從外形、結構都是介(jie)于(yu)(yu)離心泵(beng)(beng)(beng)和軸(zhou)(zhou)流(liu)泵(beng)(beng)(beng)之間;混(hun)(hun)流(liu)泵(beng)(beng)(beng)的抽(chou)(chou)水(shui)原理,葉(xie)輪(lun)的高速旋轉,既產(chan)生離心泵(beng)(beng)(beng)的離心力,又具有軸(zhou)(zhou)流(liu)泵(beng)(beng)(beng)的推(tui)升力,混(hun)(hun)流(liu)泵(beng)(beng)(beng)靠這兩種力的混(hun)(hun)合作用而(er)抽(chou)(chou)水(shui)。混(hun)(hun)流(liu)泵(beng)(beng)(beng)的使用性能也是介(jie)乎于(yu)(yu)離心泵(beng)(beng)(beng)和軸(zhou)(zhou)流(liu)泵(beng)(beng)(beng)之間,它和離心泵(beng)(beng)(beng)比(bi)較,揚(yang)程低一些,而(er)流(liu)量(liang)(liang)大一些;它與軸(zhou)(zhou)流(liu)泵(beng)(beng)(beng)比(bi)較,揚(yang)程高一些,但(dan)流(liu)量(liang)(liang)又小(xiao)一些。這對于(yu)(yu)我國幅(fu)員遼(liao)闊,地形復雜,多(duo)了一種泵(beng)(beng)(beng)型因地制宜的選用。
混流(liu)泵(beng)(beng)(beng)的使(shi)用(yong)(yong)性(xing)能(neng)以(yi)工作(zuo)參數(shu)來(lai)表示(shi)。例如(ru)流(liu)量(liang)(liang)(liang)、揚程(cheng)、功(gong)率(lv)(lv)(lv)、效率(lv)(lv)(lv)、轉速(su)等。在(zai)(zai)(zai)一定轉速(su)下,以(yi)流(liu)量(liang)(liang)(liang)為變(bian)(bian)(bian)(bian)量(liang)(liang)(liang),也(ye)就(jiu)是(shi)(shi)如(ru)果改變(bian)(bian)(bian)(bian)水泵(beng)(beng)(beng)的流(liu)量(liang)(liang)(liang),則水泵(beng)(beng)(beng)的揚程(cheng)、功(gong)率(lv)(lv)(lv)和效率(lv)(lv)(lv)等都(dou)隨(sui)之(zhi)(zhi)而變(bian)(bian)(bian)(bian)化。把這(zhe)(zhe)種相互關系的變(bian)(bian)(bian)(bian)化規律(lv),綜(zong)合繪制成幾條曲(qu)(qu)線來(lai)表示(shi),這(zhe)(zhe)就(jiu)是(shi)(shi)水泵(beng)(beng)(beng)性(xing)能(neng)曲(qu)(qu)線。混流(liu)泵(beng)(beng)(beng)的性(xing)能(neng)曲(qu)(qu)線形狀也(ye)是(shi)(shi)介于(yu)離心泵(beng)(beng)(beng)和軸流(liu)泵(beng)(beng)(beng)之(zhi)(zhi)間,對(dui)于(yu)高揚程(cheng)混流(liu)泵(beng)(beng)(beng),其(qi)流(liu)量(liang)(liang)(liang)與揚程(cheng)、流(liu)量(liang)(liang)(liang)與功(gong)率(lv)(lv)(lv)的相互關系變(bian)(bian)(bian)(bian)化規律(lv)接近于(yu)離心泵(beng)(beng)(beng),在(zai)(zai)(zai)使(shi)用(yong)(yong)上(shang),可采用(yong)(yong)關閉閥(fa)(fa)門(men)啟(qi)動,這(zhe)(zhe)時功(gong)率(lv)(lv)(lv)小,動力機安全。對(dui)于(yu)低(di)揚程(cheng)混流(liu)泵(beng)(beng)(beng),性(xing)能(neng)參數(shu)之(zhi)(zhi)間的變(bian)(bian)(bian)(bian)化規律(lv)接近于(yu)軸流(liu)泵(beng)(beng)(beng),在(zai)(zai)(zai)使(shi)用(yong)(yong)上(shang),不宜采用(yong)(yong)關閥(fa)(fa)啟(qi)動,而應該開閥(fa)(fa)啟(qi)動,這(zhe)(zhe)時功(gong)率(lv)(lv)(lv)比較小,電動機不容易(yi)被(bei)燒毀(hui)。 |