安徽快3开奖结果

全国服务热线:18631165157
网站公告:
诚信换来金招牌 服务赢得天下客...
联系我们
18631165157
地址:
安国市南阳工业区
邮箱:
415130881@qq.com
电话:
18631165157
传真:
0312-3427286
手机:
18631165157
安徽快3开奖结果 News
渣浆泵比转速在泵的分类
添加时间:2020.02.11

渣浆泵比转速在泵的分类、相似设计和产品系列化方面具有重要用途。

(1)用比转速对泵进行分类。离心泵的比转速大小与输送液体的性质无关,而与叶轮形状及泵的特性曲线有密切关系,可以根据比转速的大小,将泵分成低比转速、中比转速和高比转速的离心泵,以及比转速更高的混流泵和轴流泵,见表1-7。同时,表1-7还表示了比转速与叶轮形状及特性曲线形状的关系。可以看出,低比转速泵主要指高扬程、小流量,高比转速则代表低扬程、大流量;低比转速泵叶轮外形窄而长.高比转速泵叶轮宽而短;低比转速泵特性曲线,零流量时轴功率小,应关闭出口阀门启动反之高比转速泵零流量时轴功率大,应在出口阀门打开时启动;低比转速泵高效区比较宽高比转速泵商效率区比较窄;低比转速泵由于叶轮狭窄,叶轮中流动损失较大,效率较低,反之高比转速深效宰相对比较高。

(2)用比转速进行相似设计。在离心泵的相似设计中,可以根据比转速相等的原则。从现有的经过实践证明性能良好的泵中选取模型泵然后利用相似定律把模型泵的性能参数和何参数换算成原型泵的性能参数和结构尺寸。当根据工作需要的QHn计算出n、值小于30时,一般采用容积式泵;当比转速n.>30时,则采用离心泵、混流泵或轴流泵等。渣浆泵厂家

(3)用比转速编制离心泵系列。在编制离心泵系列时,只要适当地选择流量、扬程和转速的组合, 就可以将反映同一.类型泵的性能和结构的综合性参数n。绘在同一张坐标图上,即型谱图,并使n。在型谱图上均匀地分布。这样就大为减少水力模型的数目,对设计制造部门来说,就能节约大量人力、物力

The specific speed of slurry pump has an important use in pump classification, similar design and product serialization。

(1) Pumps are classified by specific speed。 The specific speed of centrifugal pump has nothing to do with the nature of liquid delivered, but has a close relationship with the shape of impeller and the characteristic curve of pump。 According to the specific speed, the pump can be divided into low specific speed, medium specific speed and high specific speed centrifugal pump, and mixed flow pump and axial flow pump with higher specific speed。 See table 1-7。 At the same time, table 1-7 also shows the relationship between specific speed and impeller shape and characteristic curve shape。 It can be seen that the low specific speed pump mainly refers to the high head and small flow, while the high specific speed pump represents the low head and large flow; the impeller shape of the low specific speed pump is narrow and long, and the impeller of the high specific speed pump is wide and short; the characteristic curve of the low specific speed pump is that the shaft power is small when the flow is zero, and the outlet valve should be closed to start; on the contrary, the shaft power is large when the flow of the high specific speed pump is zero, and it should be started when the outlet valve is open; the low specific speed pump The high efficiency area is wider than that of high specific speed pump, and the efficiency area is narrower; because the impeller of low specific speed pump is narrow, the flow loss in the impeller is larger, and the efficiency is lower, on the contrary, the high specific speed and deep efficiency are relatively high。

安徽快3开奖结果(2) Similar design with specific speed。 In the similar design of centrifugal pump, according to the principle of equal specific speed, the model pump can be selected from the existing pumps with good performance, and then the performance parameters and geometric parameters of the model pump can be converted into the performance parameters and structural dimensions of the prototype pump by using the similarity law。 When the value of N calculated by Q, h and N is less than 30, the positive displacement pump is generally used; when the specific speed is more than 30, the centrifugal pump, mixed flow pump or axial flow pump are used。 Slurry pump manufacturer

(3) The centrifugal pump series is designed with specific speed. In the design of centrifugal pump series, as long as the combination of flow, head and speed is properly selected, the comprehensive parameter n reflecting the performance and structure of the same type pump can be obtained. It is drawn on the same coordinate map, i.e. type spectrum, and n. It is evenly distributed on the type spectrum. In this way, the number of hydraulic models can be greatly reduced, and a lot of manpower and material resources can be saved for the design and manufacturing department





安徽快3开奖结果 澳客彩票APP下载 湖北快3走势图 博旺彩票APP下载 湖北快3开奖结果 百盈彩票APP下载 安徽快3开奖结果 百万彩票APP下载 博美彩票官网 百赢彩票APP下载