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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比，也可選用不同轉(zhuǎn)速的動力機(jī)。

(3)水泵轉(zhuǎn)速改變后，其流量(Q)、揚程(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、揚程和功率。 Q、H、N分別代表規(guī)定轉(zhuǎn)速下的流量、揚程和功率。

(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。過分提高轉(zhuǎn)速會發(fā)生其它事故，故應(yīng)慎用。

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

農(nóng)用混流泵@新市農(nóng)用混流泵@250HW-7農(nóng)用混流泵當(dāng)天發(fā)貨

混流泵是介于離心泵和軸流泵之間的泵型需要把壓水室規(guī)劃成徑導(dǎo)游葉(正導(dǎo)葉)加上類球形泵殼的構(gòu)造型式是葉輪內(nèi)安穩(wěn)的相對運動的條件。為此，請求在導(dǎo)葉中的螺旋線有些的液體，不受任何外力的效果。

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@新市農(nóng)用混流泵@250HW-7農(nóng)用混流泵當(dāng)天發(fā)貨

 *特征描述

HW 型蝸殼式混流泵是按國家標(biāo)準(zhǔn)系列而設(shè)計的高節(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、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
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)簡單，使用管理方法，維修容易。延伸搜索：水環(huán)真空泵
（三）型號說明
以250HW—8為例：
250—泵進(jìn)（出）水口直徑為250毫米。
8—泵總揚長為8米。

（四）水泵的傳動方式
我廠生產(chǎn)的HW型系列混流泵均機(jī)（電）兩用，其轉(zhuǎn)動方式視各地區(qū)動力情況而定，訂貨時根據(jù)原動機(jī)的型號（功率、轉(zhuǎn)速）確定水泵的傳動方式，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)水口看葉輪為逆時針方向旋轉(zhuǎn)（即箭頭所示的方向旋轉(zhuǎn)）。

農(nóng)用混流泵@新市農(nóng)用混流泵@250HW-7農(nóng)用混流泵當(dāng)天發(fā)貨

軸承發(fā)熱，軸封發(fā)熱，轉(zhuǎn)子竄動大，發(fā)生水擊一，泵不能發(fā)動或發(fā)動負(fù)荷大要素及處理辦法如下。原動機(jī)或電源不正常。處理辦法：查看電源和原動機(jī)狀況。泵卡住。處理辦法：用手盤動聯(lián)軸器查看，必要時崩潰查看，消除動靜有些毛病。填料壓得太緊。處理辦法：放松填料。排出閥未關(guān)。處理辦法：封閉排出閥，從頭發(fā)動。平衡管不曉暢。處理辦法：疏通平衡管。

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.