The diameter of horizontal multistage centrifugal pump pipe is reasonably determined
The diameter of the pipeline affects the efficiency of the pump station. It has been proved that too large or small diameter is not economical. When the pipe length and the flow rate are certain, the diameter of the tube is large, the flow rate is small, the head loss is small, and the energy consumption is small, but the pipeline investment is high. If the diameter of the tube is small, the situation is the opposite. In order to reduce pipeline loss, the horizontal multistage centrifugal pump should be reasonable to determine the diameter of pipe. If the diameter of the tube is too small, the head loss will be increased, in order to improve pipeline efficiency, the pipeline should be replaced by economic pipe.
Shorten the length of horizontal multi-stage centrifugal pump tube
The length of the outlet pipe should be shortened maximum. But when the terrain between the water and the sink is flat. Shortening the pipeline will inevitably increase the drainage of the channel, the pool and the pump room, or the filling of the pool and the canal. The small pump station should be installed in a flat recliner, or the pump should be well down and half well installed, the line layout of is changed, and it can save elbow and reduce head loss. According to the condition, the inner wall of the pipeline can be improved to reduce the loss of pipeline resistance. Generally the high lift centrifugal pump pumping unit should be used to reduce the main drag resistance.
Reducing the pipe fittings
The local resistance coefficient of pipeline accessories is very large, which will cause a large loss of water head, which must consume a lot of energy during operation. Therefore, it is necessary to minimize unnecessary internal pipe fittings. The bottom valve has the maximum drag coefficient in the pipeline accessories and should be replaced with other water filling equipment and cut-off facilities. According to the relevant information, the energy loss of the bottom valve accounts for 50% ~ 70% of the total energy loss of the water pipe, and accounts for 10% ~ 50% of total energy loss of water pipe. The lower the head of the pump station, the larger the power loss of the bottom valve. In addition, the existence of the bottom valve also causes a lot of trouble to the operation management, so it is very early to call the end valve. Now some pump stations have cancelled the bottom valve, and the vacuum pump has been used to fill the water, which has achieved better energy saving effect. But in small pumping devices, the bottom valve is still ubiquitous, which is one of the reasons for its low efficiency.
In order to reduce the loss of water head of pipe inlet and outlet, it can be added in the pipeline inlet. For the inclined pipe line, it can be used to install the flat or special speaker tube in the inlet and the outlet of the pipe is used for the diffusion tube, and the energy saving effect is obvious.
Eliminate "antiaircraft gun" type outflow
The so-called "anti-aircraft gun" type flow is a horizontal multi-stage centrifugal pump that pumps out the outlet of the water above the water surface of the sink. This kind of flow method artificially elevates the actual lift of the pump station, the operating point of the pump moves to the left, the flow of water pump decreases and the efficiency decreases. At the same time, due to the turbulence of water flow in the pool, the head loss and the length of the water head loss and the building (or structure) are increased. In order to increase the amount of water, improve the efficiency of the water pump and reduce the energy consumption, the outlet of the water pump should be installed below the surface of the water outlet building (or structure).
The established "anti-aircraft gun" pump station can be converted into siphon flow. In order to prevent the water flow in the water during the shutdown, there is a facility to destroy the siphon vacuum. The small pump station can be located in the rise section of the siphon, corresponding to the design of the water level at the height of the water tank to install a windpipe. When it is down, the water is rapidly leaking under the force of gravity, which creates a vacuum in which the air is sucked in and the siphon is destroyed. The area of the vent pipe is generally 5 ~ 8% of the total area of the water pipe.
