混流泵

（一） 型号说明：

以250HW-8为例：

250―泵进（出）水口直径为250毫米。

8―泵总扬程为8米。

III. Type Instruction:

Take 250HW-8 for an example:

250-The diameter of inlet /outlet of pump is 250mm.

8-The total head of pump is 8m.

开车顺序：

1、关闭出口闸阀

2、将水注入水泵，以排除进水管及泵内空气，可从泵体顶端引水杯注入清水，也可用真空泵注水（开动真空泵，排除水泵及管内气体在水充满水泵的同时，起动水泵，打开闸阀，停止真空泵）。

3、开启电动机（注意水泵的旋转方向）。

4、当电动机正常运转后，逐步开大闸阀，达到所要求的工况后，调节填料松紧。若水泵运转，轴承温度等都正常，则可继续运行。

III. Starting

Sequence

1.Close the oulet

sluice valve.

2. Inject

water into pump to remove the air in water-in pipe and pump which can realized

by injecting clear water from the water diversion cup of the pump body end or

by vacuum pump(start the vacuum pump, remove the air from pump and pipes, start

the water pump when the pump is full of water, open the sluice valve, stop the

vacuum pump).

3. Start the

motor(pay more attention on the rotation direction of pump)

4. When the motor runs normally, turn up the

sluice valve gradually, adjust the tightness of padding when gettng to the

required working condition.If the pump runs well, the temperature of bearing is

normal, and it can run sequentially.

Failure Casues and Resolving Methods

故障现象

Failures

原 因

Reas

消 除

方 法

Methods

1、水泵不出水

No water are

runing out

1、引水不够真空泵抽吸空气不尽

2、进水管路进气

3、水泵转速太低

4、吸程太高

5、水泵转向不对

6、输水高度超过规定

1.The diversion is not engouth or the

vacuum pump does not remove all air

2.Air suction for inlet pipes

3.The rotate speed of pump is too low

4.Suction head is too high

5.The turnning direction is not right

6.Water delivery height exceeds stated

one.

1、继续加灌或抽气

2、检查并堵塞之

3、用转速表检查予以调整

4、降低安装位置减少吸程

5、改变旋转方向

6、减少输水高度

1.Continue filling or removing air

2.Check and seal it

3.Check by tachometer and adjust it

4.Reduce the installation po ition,

reduce the suction head

5.Change the turnning direction

6. Reduce water delivery height

4、叶轮表面的气蚀。由于叶片背水面运行时产生负压，当压力Pklt;Pva时，产生汽穴和蜂窝表面后，在电化学腐蚀作用下，使泵叶汽蚀。

5、容积损失和机械损失。由于泵使用时间长，机械磨损产生漏失和阻力增大，使容积效率和机械效率降低。

以上原因，使水泵性能变差。运行效率降低2～5%，严重的可以使水泵效率降低10%以上。