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(2)改變轉(zhuǎn)速的方法：改變皮帶輪外徑或改變齒輪減速器傳動(dòng)比，也可選用不同轉(zhuǎn)速的動(dòng)力機(jī)。

(3)水泵轉(zhuǎn)速改變后，其流量(Q)、揚(yáng)程(H)和功率(N)的變化關(guān)系如下式所示： Q1=Q*n1/n   H1=H*(n1/n)2    N1=N*(n1/n)3

 式中：Q1、H1、N．分別代表轉(zhuǎn)速改變后的流量、揚(yáng)程和功率。 Q、H、N分別代表規(guī)定轉(zhuǎn)速下的流量、揚(yáng)程和功率。

(4)水泵轉(zhuǎn)速提高后，耗用功率增加，吸上真空度降低，壽命縮短。過(guò)分提高轉(zhuǎn)速會(huì)發(fā)生其它事故，故應(yīng)慎用。

(5)水泵轉(zhuǎn)速過(guò)分降低時(shí)，泵的使用效益低，為此，應(yīng)盡量避免泵在過(guò)低轉(zhuǎn)速下運(yùn)行。用戶應(yīng)按性能曲線圖選擇使用。

農(nóng)用混流泵@尉犁農(nóng)用混流泵@300HW-7農(nóng)用混流泵相信會(huì)泉

潛水軸流泵研究計(jì)劃與數(shù)值模子，CFD闡發(fā)利用在潛水混流泵水力計(jì)劃中能夠低落計(jì)劃周期本錢，可經(jīng)由過(guò)程摹擬流態(tài)和數(shù)據(jù)闡發(fā)挑選良好的水力模子。)潛水混流泵葉片數(shù)越多，到達(dá)計(jì)劃點(diǎn)流量、揚(yáng)程越高，葉輪出口速率增大，水力喪失增大，服從降低。依照2種葉輪和4種導(dǎo)葉計(jì)劃計(jì)劃進(jìn)行組合獲得8種水力計(jì)劃計(jì)劃。

2、允許吸上真空度[Hs]與必需汽蝕余量[NPSH]r的換算關(guān)系：

 [Hs]≈10-[HPSH]c

 [NPSH]r≈[NPSH]C+0.3

 式中：[Hs]-允許吸上真空度   米

 [NPSH]C-臨界汽蝕余量   米

 [NPSH]r-必需汽蝕余量   米

農(nóng)用混流泵@尉犁農(nóng)用混流泵@300HW-7農(nóng)用混流泵相信會(huì)泉

 *特征描述

HW 型蝸殼式混流泵是按國(guó)家標(biāo)準(zhǔn)系列而設(shè)計(jì)的高節(jié)能產(chǎn)品。其性能指標(biāo)均達(dá)到先進(jìn)水平，省材節(jié)能效果顯著。延伸搜索：水環(huán)真空泵

（一）用途
HW型混流泵為臥式、單級(jí)、單吸、懸臂蝸殼式混流泵，適用于農(nóng)田排灌、工業(yè)、城鎮(zhèn)給排水及船塢、碼頭引水等。延伸搜索：水環(huán)真空泵
（二）特點(diǎn)
體積小、重量輕、流量大、效率高，汽蝕性能好，區(qū)范圍寬廣而平坦，結(jié)構(gòu)簡(jiǎn)單，使用管理方法，維修容易。延伸搜索：水環(huán)真空泵
（三）型號(hào)說(shuō)明
以250HW—8為例：
250—泵進(jìn)（出）水口直徑為250毫米。
8—泵總揚(yáng)長(zhǎng)為8米。

（四）水泵的傳動(dòng)方式
我廠生產(chǎn)的HW型系列混流泵均機(jī)（電）兩用，其轉(zhuǎn)動(dòng)方式視各地區(qū)動(dòng)力情況而定，訂貨時(shí)根據(jù)原動(dòng)機(jī)的型號(hào)（功率、轉(zhuǎn)速）確定水泵的傳動(dòng)方式，以定皮帶輪的大小或聯(lián)軸器的規(guī)格。延伸搜索：水環(huán)真空泵
（五）水泵轉(zhuǎn)向：
從水泵進(jìn)水口看葉輪為逆時(shí)針?lè)较蛐D(zhuǎn)（即箭頭所示的方向旋轉(zhuǎn)）。

農(nóng)用混流泵@尉犁農(nóng)用混流泵@300HW-7農(nóng)用混流泵相信會(huì)泉

揚(yáng)程h為?；炝鞅梦宕蟪Ｒ?jiàn)問(wèn)題及解決辦法:1，傳動(dòng)軸或電機(jī)軸承過(guò)熱產(chǎn)生原因：缺少潤(rùn)滑油或軸承破裂等。解決辦法：加注潤(rùn)滑油或更換軸承2，混流泵不出水產(chǎn)生原因：泵體和吸水管沒(méi)灌滿引水；動(dòng)水位低于水泵濾水管；吸水管破裂等。解決辦法：排除底閥故障，灌滿引水；降低水泵的安裝位置，使濾水管在動(dòng)水位之下，或等動(dòng)水位升過(guò)濾水管再抽水；修補(bǔ)或更換吸水管。混流泵功率消耗過(guò)大產(chǎn)生原因：水泵轉(zhuǎn)速太高；水泵主軸彎曲或水泵主軸與電機(jī)主軸不同心或不平行；選用水泵揚(yáng)程不合適；水泵泥沙或有堵塞物；電機(jī)滾珠軸承損壞等。解決辦法：檢查電路電壓，降低水泵轉(zhuǎn)速；水泵主軸或調(diào)整水泵與電機(jī)的相對(duì)位置；選用合適揚(yáng)程的水泵；清理泥沙或堵塞物；更換電機(jī)的滾珠軸承。

Instructions for use (i) the HW mixed-flow pump is composed of main parts such as pump body, pump cover, impeller, pump shaft and bearing body. (Ii) The pump cover is a part of the pump connected to the inlet pipe, with a specified axial end gap between the end surface and the impeller (maintaining the specified axial bance after eliminating the axial activity gap of the bearing). The gap is too small to produce friction, too large will lead to the pump pressure water reflux, so that the pump efficiency is reduced, through the increase or decrease adjustment paper pad to meet the required requirements of the gap. Extended search: Water ring Vacuum Pump (iii) The sealing device is composed of a filler letter, a water seal letter, a filler cover and a lead powder (or oil immersion) asbestos root. Its role is: 1, in the tea to prevent air inhalation pump, play a sealing role. 2. When pumping, prevent water from flowing out of the pump too much along the shaft. (Iv) Shaft application to protect the shaft does not make it directly friction with the filler, if long-term use found that the bushing wear too much, can change the bushing. (V) The two supports of the pump shaft are bearings in the bearing body, and the bearing has an appropriate amount of grease in its body to lubricate the bearings. (Vi) The baffle on the shaft prevents water from flowing into the bearing body along the pump, thus protecting the bearing and extending its service life.