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(2)改變轉速的方法：改變皮帶輪外徑或改變齒輪減速器傳動比，也可選用不同轉速的動力機。jdhuiquan717

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

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

(4)水泵轉速提高后，耗用功率增加，吸上真空度降低，壽命縮短。過分提高轉速會發(fā)生其它事故，故應慎用。

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

化工混流泵A運河化工混流泵200HW-5

（1）QJ型性能范圍流量2～500米3/時，揚程14～336米，配套功率0.55～160千瓦，適用井徑100～400毫米，共8種，有83個YQS型潛水異步電動機的規(guī)格，組成QJ型潛水電泵系列共338個系列型號。（2）使用條件電源為50赫茲、380伏的三相交流電源；水溫不超過20°C；井水含砂量9重量比）不超過0.01%；井水酸堿PH值為6.5～8.5；電機和泵應全部浸入水中運行。（3）結構特點水泵位于電泵上端，為離心式或混流式，采用水潤滑軸承，與電機軸用聯(lián)軸器剛性聯(lián)接。上端設有逆止閥體，以泵停機時倒流引起的超速反轉。電機位于電泵下端，為密封式充水濕式結構。定子繞組采用耐水的聚乙烯絕緣的尼龍護套多層結構電磁線。

2、允許吸上真空度[Hs]與必需汽蝕余量[NPSH]r的換算關系：

 [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

 *特征描述

HW 型蝸殼式混流泵是按國家標準最新系列而設計的高節(jié)能產(chǎn)品。其性能指標均達到國際先進水平，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，高效區(qū)范圍寬廣而平坦，結構簡單，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（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（電）兩用，其轉動方式視各地區(qū)動力情況而定，訂貨時根據(jù)原動機的型號（功率、轉速）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）水泵轉向：
從水泵進水口看葉輪為逆時針方向旋轉（即箭頭所示的方向旋轉）。

化工混流泵A運河化工混流泵200HW-5

The output shaft is connected at the top of the guanting, which can drive the generator to generate electricity or drive other machinery such as agricultural and sideline products processing machinery.

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.