Introduction of deep well pump function

1.High lift pump for low lift pumping Many machine hand think that the lower the pump head, the smaller the motor load. In this misunderstanding of misunderstanding, the purchase of pumps, the pump will often choose a high lift. In fact, for centrifugal pumps, when the pump model is determined, the size of its power consumption is proportional to the actual flow of the pump. The pump flow will increase with the head decreases, so the higher the head, the smaller the flow, the smaller the power consumption. Conversely, the lower the head, the greater the flow, the greater the power consumption. Therefore, in order to prevent the motor overload, the general requirements of the actual use of pumps pumping head can not be less than 60% of the calibration head. Therefore, when the high head for low lift pumping, the motor overload and easy to heat, serious can burn the motor. If emergency use, it must be installed in the outlet pipe to adjust the amount of water out of the gate valve (or wood and other materials blocking the small outlet) to reduce the flow to prevent motor overload. Note that the motor temperature rise, if the motor overheating, should be promptly shut down a small outlet flow or shutdown. This is also prone to misunderstanding, some machine hand that plug the outlet, forced to reduce the flow, will increase the motor load. In fact, just the opposite, the regular high-power centrifugal pump irrigation and drainage units are equipped with a gate valve, in order to reduce the unit when the motor load, should first close the gate valve until the motor starts and then gradually open the gate valve is the truth.

2. Large diameter water pump with small water pumping

Many hands that this can improve the actual head, in fact, the actual pump head = total head ~ loss of head. When the pump model is determined, the total head is certain; the loss of head is mainly from the pipeline resistance, the smaller diameter is clearly the greater the resistance, and thus the greater the loss of head, so reduce the diameter, the pump can not increase the actual head not only , But will reduce, resulting in reduced pump efficiency. Similarly, when the small diameter water pump with a large pipe pumping, it will not reduce the pump's actual head, but will reduce the resistance of the pipeline to reduce the loss of head, so that the actual head has increased. But also organic hand that small diameter water pump with a large pipe pumping, it will greatly increase the motor load, they believe that the diameter increases, the water pipe in the water pump impeller pressure on the large, which will greatly increase the motor load. As everyone knows, the size of the liquid pressure only with the level of the head, and has nothing to do with the size of the water pipe cross-sectional area. As long as a certain lift, the pump impeller size the same, no matter how much diameter, the role of pressure on the impeller are certain. But the diameter increases, the water resistance will decrease, leaving the flow rate has increased, power consumption has also increased. But as long as the rated head range, regardless of how to increase the diameter of the pump can work, and can also reduce the pipeline losses, improve pump efficiency.

3. When installing the inlet line, the horizontal section is horizontal or upwards

Doing so will gather air in the inlet pipe, reducing the vacuum of water pipes and pumps, so that the pump suction head decreases, the water volume reduced. The correct approach is: the horizontal section should be slightly tilted to the direction of the water, should not be level, not to tilt upwards.

4. Inlet pipe with more elbows

If the inlet pipe with more elbows, will increase the local water resistance. And the elbow should be turned in the vertical direction, not allowed to turn in the horizontal direction, so as not to gather air.

5. Water pump inlet and elbow directly connected

This will make the water flow through the elbow into the impeller when the uneven distribution. When the inlet pipe diameter is greater than the pump inlet, eccentric reducer should be installed. Eccentric reducer to be installed in the plane part of the above, bevel part installed in the following. Or gather the air, the water is reduced or not pumping Sheung Shui, and a crash and so on. If the inlet pipe and water pump inlet diameter equal, should be in the pump inlet and elbow between the plus pipe, straight pipe length shall not be less than 2 to 3 times the diameter of the pipe.

6. The bottom section of the inlet pipe with the bottom valve is not vertical

If so installed, the valve can not be self-closing, resulting in water leakage. The correct method of installation is: the end of the inlet pipe is equipped with bottom valve, the most section is the best vertical. As a result of terrain conditions can not be installed vertically, the water pipe axis and the horizontal angle should be more than 60 °.

7. Intake pipe inlet location is wrong

(1) The water intake of the inlet pipe from the bottom of the pool and the water wall is less than the diameter of the inlet. If the bottom of the sediment and other dirt, the water inlet from the bottom of the distance is less than 1.5 times the diameter of the water will cause poor water or suction into the mud and debris, plug the inlet.
(2) into the water inlet into the water depth is not enough, this will cause a water pipe around the water whirlpool, affecting the water, reducing the amount of water. The correct installation method is: small and medium-sized pump into the water depth of not less than 300 ~ 600mm, large pumps shall not be less than 600 ~ 1000mm.

8. Outlet in the mouth of the normal water level above

If the outlet in the pool above the normal water level, although increasing the pump head, but reduces the flow. As a result of terrain conditions, the outlet must be higher than the water level of the pool, you should install the elbow pipe and short pipe, so that the water pipe into a siphon, reducing the height of the outlet

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Keywords:Deep well pump, wrong common sense, the right way