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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)。jdhuiquan717

(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(yùn)行。用戶應(yīng)按性能曲線圖選擇使用。

大口徑混流泵A臺州大口徑混流泵惠顧熱線

And the blockage of leaf rotation, etc., should be solved by corresponding measures. (2) pipe leakage or leakage, may be installed when the bolts are not tightened. If the leakage is not serious, you can apply cement slurry in a leaking or leaking place, tighten the nut with the plate hand, and if the leak is serious, reload it. (3) The pump is violently shaken, may be in the electric rotor imbalance, or the coupling combination is not bad, bearing wear, bending, may also be caused by the rotating parts loosening, rupture and pipe bracket is not tight. Adjustments, reinforcement, straightening or replacement should be made depending on the circumstances. In our daily life or in our work, we often use an industrial machinery, we call it a water pump. Many common pump structures are not very complex, but they may often be uncertain in pump selection, especially when we use the pump for the first time. Let's introduce the pump in the end how to choose not to let us time-consuming and laborious. The first step is to let us know the type of pump.

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

 *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(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(yáng)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)）。

大口徑混流泵A臺州大口徑混流泵惠顧熱線

High pressure liquid column because of the Russian power outage rapid pouring, impact on the pump outlet valve plate. Treatment b: The pump unreasonable discharge system of the pipeline, pipeline adjacent to the placement of the transbation. The valve of the outlet pipe is closed too fast. Treatment b: Gradually close the valve. According to its tectonic type, the mixed-flow pump can be divided into two kinds of volute shell type and guide vane type. The worm shell mixed-flow pump has two kinds of horizontal and vertical. Now the production and use of a wide range of horizontal, vertical mostly used for large pumps. The structure of the worm shell mixed-flow pump is similar to that of a single-stage single-suction centrifugal pump. But the shape of the impeller is not the same, the outlet edge of the mixed-flow pump blade is skewed, the number of blades is small, the flow channel is wide. The flow of water through the impeller is axial into, oblique out. In addition, the worm shell of the same caliber mixed-flow pump is larger than that of centrifugal pump. Divided into horizontal and vertical two kinds. Usually the mounting angle of the blade can be adjusted with the change of working conditions to maintain operation in the high efficiency zone. The technical requirements for the installation of agricultural pumps are very strict. First, the pump base should be firm.
使用說明