(2)改变转速的方法：改变皮带轮外径或改变齿轮减速器传动比，也可选用不同转速的动力机。

(3)水泵转速改变后，其流量(Q)、扬程(H)和功率(N)的变化关系如下式所示： Q1=Q*n1/n   H1=H*(n1/n)2    N1=N*(n1/n)3

 式中：Q1、H1、N．分别代表转速改变后的流量、扬程和功率。 Q、H、N分别代表规定转速下的流量、扬程和功率。

(4)水泵转速提高后，耗用功率增加，吸上真空度降低，寿命缩短。过分提高转速会发生其它事故，故应慎用。

(5)水泵转速过分降低时，泵的使用效益低，为此，应尽量避免泵在过低转速下运行。用户应按性能曲线图选择使用。

灌溉混流泵@若羌灌溉混流泵@350HW-8灌溉混流泵厂家直营

潜水轴流泵研究计划与数值模子，CFD阐发利用在潜水混流泵水力计划中能够低落计划周期本钱，可经由过程摹拟流态和数据阐发挑选良好的水力模子。)潜水混流泵叶片数越多，到达计划点流量、扬程越高，叶轮出口速率增大，水力丧失增大，服从降低。依照2种叶轮和4种导叶计划计划进行组合获得8种水力计划计划。

2、允许吸上真空度[Hs]与必需汽蚀余量[NPSH]r的换算关系：

 [Hs]≈10-[HPSH]c

 [NPSH]r≈[NPSH]C+0.3

 式中：[Hs]-允许吸上真空度   米

 [NPSH]C-临界汽蚀余量   米

 [NPSH]r-必需汽蚀余量   米

灌溉混流泵@若羌灌溉混流泵@350HW-8灌溉混流泵厂家直营

 *特征描述

HW 型蜗壳式混流泵是按国家标准系列而设计的高节能产品。其性能指标均达到先进水平，省材节能效果显着。延伸搜索：水环真空泵

（一）用途
HW型混流泵为卧式、单级、单吸、悬臂蜗壳式混流泵，适用于农田排灌、工业、城镇给排水及船坞、码头引水等。延伸搜索：水环真空泵
（二）特点
体积小、重量轻、流量大、效率高，汽蚀性能好，区范围宽广而平坦，结构简单，使用管理方法，维修容易。延伸搜索：水环真空泵
（三）型号说明
以250HW—8为例：
250—泵进（出）水口直径为250毫米。
8—泵总扬长为8米。

（四）水泵的传动方式
我厂生产的HW型系列混流泵均机（电）两用，其转动方式视各地区动力情况而定，订货时根据原动机的型号（功率、转速）确定水泵的传动方式，以定皮带轮的大小或联轴器的规格。延伸搜索：水环真空泵
（五）水泵转向：
从水泵进水口看叶轮为逆时针方向旋转（即箭头所示的方向旋转）。

灌溉混流泵@若羌灌溉混流泵@350HW-8灌溉混流泵厂家直营

密封，支座或根底共振，管路，机器共振，齿轮啮合不良或磨损。处理办法：同4，加固根底或管路。振荡频率非常高。密封，轴承，齿轮不精细，轴承颤动，不良的收缩合作等。处理办法：同4。轴承发热要素及处理办法如下：1，轴承瓦块刮研不合请求。处理办法：从头修补轴承瓦块或替换。轴承空隙过小。处理办法：从头调整轴承空隙或刮研。光滑油量缺乏，油质不良。处理办法：添加油量或替换光滑油。轴承安装不良。处理办法：按请求查看轴承安装状况，消除不合请求要素。冷却水断路。处理办法：查看，修补。轴承磨损或松动。处理办法：修补轴承或作废。若松动，复紧有关螺栓。泵轴曲折。处理办法：纠正泵轴。甩油环变形。甩油环不能滚动，带不上油。处理办法：更新甩油环。

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 clearance 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.