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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。

河道排水泵A襄樊河道排水泵圖片

The relevant parts may be replaced as appropriate to troubleshoot. And if the pump damage is very serious, there is no repair conditions on the way, you can put the pump into, outlet pipe directly on, in order to make full use of the natural circulation of hot and cold water temporarily so that the engine to maintain a normal temperature; or use an inner tube or bucket as a container to secure it firmly, and then draw two hoses from the container, One is connected to the inlet of the engine and the other to the outlet of the engine, and the other end of the two tubes is inserted into the container. Secondly, the hose should be fixed firmly. If only the pump shell produces cracks and leaks, the cracks can be treated clean, and then glued with adhesives. For emergency use, egg cleaning and cement can be mixed into sticky groups applied to the cracks, after a few minutes of solidification can be used. Also, the construction machinery driving or operation process, the water seal leakage of the pump is also a common thing. As long as there is no damage to the hydrosphere or swelling deformation, the spring force of the water seal is insufficient or broken and other faults.

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系列而設計的高節能產品。其性能指標均達到先進水平，省材節能效果顯著。延伸搜索：水環真空泵

（一）用途
HW型混流泵為臥式、單級、單吸、懸臂蝸殼式混流泵，適用于農田排灌、工業、城鎮給排水及船塢、碼頭引水等。延伸搜索：水環真空泵
（二）特點
體積小、重量輕、流量大、效率高，汽蝕性能好，區范圍寬廣而平坦，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
我廠生產的HW型系列混流泵均機（電）兩用，其轉動方式視各地區動力情況而定，訂貨時根據原動機的型號（功率、轉速）確定水泵的傳動方式，以定皮帶輪的大小或聯軸器的規格。延伸搜索：水環真空泵
（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）。

河道排水泵A襄樊河道排水泵圖片

Pipe caliber and so on. The third step: according to the above requirements to choose the pump, so it is more perfect. Of course, this is only a rough choice, a detailed selection method is still many, you can call our company. It is possible to encounter water pump leakage situation, if so, what should we do? Is there any good way to deal with this sudden situation? No hurry, Changsha pump-pump for you one by one way. First of all, the pump is operating when there is a leak, we must pay attention to a point, do not immediately stop the pump work, should keep it at the lowest stable speed, at the same time to the cooling system side to add water edge, so that the engine cooling, short time, slow driving, drive to the nearby hideout and then eliminate. In addition, when opening the lid of the water cover to add water, to put a cover above it, to prevent the water vapor that is coming out oh. When we were using the pump. If the sudden pump shell rupture and leakage, or the pump inside the machine damage and loss of pump water action.
使用說明