混流泵

（二）泵蓋是泵與進(jìn)水管相連的零件，其端面與葉輪之間留有規(guī)定的軸向端面間隙（在消除軸承軸向活動間隙以后，保持規(guī)定的軸向間隙）。間隙過小產(chǎn)生磨擦，過大則會導(dǎo)致泵內(nèi)壓力水回流，使泵的效率降低，通過增減調(diào)整紙墊達(dá)到規(guī)定的間隙。

II.  Pump cover is

the part connected with water inlet pipe.There is an stated axial end face gap

between its end

face and

impeller(Keep the stated axail gap after removing the bearing axial movable

gap).Friction will be

produced if

the gap is too small, contrary, if the gap is too large, the pressure water in

pump will reflux which

makes the

feeiciency reduced.Adjust the paper washer and make the gap be stated one.

 4、耗用功率太大

 The power

 cumption is too large

 1、轉(zhuǎn)速太高

 2、傳動軸彎曲

 3、填料壓得太緊

 4、軸承磨損或損壞

 5、葉輪和前蓋摩擦

 6、皮帶太緊

 1.The rotate speed is too high

 2.The drive shaft is bend

 3.The padding is too tight

 4.The bearing is worn out

 5.Impeller clashes the front cover

 6.The belt is too tight

 1、降低轉(zhuǎn)速

 2、校直

 3、擰松壓蓋螺栓或?qū)⑻盍先〕龃虮庖恍?

 4、更換軸承

 5、調(diào)整葉輪端面軸向間隙

 6、適應(yīng)放松

 1.Reduce the rotate speed

 2.Straightening

 3.Loose the cap blot or take our the

 padding and make it more flat

 4.Change the bearing

 5.Ajust the end play of impeller end face

 6.Loose the belt to suitable degree

常用的農(nóng)用泵

離心泵

離心泵型號、品種規(guī)格及其變型產(chǎn)品在農(nóng)用泵中是多的。根據(jù)水流入葉輪的方式、葉輪多少、泵身能否自吸以及配套動力大小和動力品種等，離心泵有單級單吸離心泵、單級雙吸離心泵、多級離心泵、自吸離心泵、電動機(jī)泵和柴油機(jī)泵等。

2、軸流泵的一般特點(diǎn)

（1）水在軸流泵的流經(jīng)方向是沿葉輪的軸向吸入、軸向流出，因此稱軸流泵。

（2）揚(yáng)程低（1～13米）、流量大、效益高，適于平原、湖區(qū)、河區(qū)排灌。

（3）起動前不需灌 ，操作簡單。

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