How to improve the efficiency of entering and leaving the pool

The long-term operation of the pump causes the parts to wear out, or the engineering benefits are attenuated, the energy consumption is increased, and the water supply and drainage costs are increased due to poor quality and old pump type. Therefore, the renovation and modification of existing water pump equipment is an urgent problem to be solved.

vacuum coating machine,pvd coating machine,pvd vacuum machine,vacuum ion coating machine,multi-arc ion coating machine

The efficiency of the water pump entering and leaving the pool is the percentage of the pump head lift to the lift of the device. The flow conditions of the pumping station into and out of the pool are not only related to the efficiency of the pump entering and leaving the pool, but also affecting the efficiency of the pumping station. Poor water inlet conditions have a certain impact on pump operating efficiency, which is particularly noticeable in small vertical pumping units. In order to improve the efficiency of the water pump entering and leaving the pool, the following measures can be taken during the transformation.

In order to improve the inflow and outflow state and reduce the hydraulic loss, the necessary diversion facilities can be set according to the specific conditions. For example, the lateral inflow pre-pool can be provided with a diversion pier to improve the flow regime.

When the floating matter such as weeds entering the pool is sucked into the pump body, the pump efficiency is lowered and even the blades are crushed. Set the trash rack well to clear the dirt in time to make the water flow smooth, which can improve the efficiency of the pump station. The pumping station is generally equipped with a trash rack before entering the pool to prevent weeds and debris from entering the pump and ensuring the safe operation of the pump. There are two methods for removing water and grass debris by manual and mechanical automatic cleaning. Large and medium pumping stations should use mechanical cleaning, and small pumping stations should be cleaned manually.

vacuum coating machine,pvd coating machine,pvd vacuum machine,vacuum ion coating machine,multi-arc ion coating machine

The shape and size of the trash rack not only affects engineering investment. And has a greater impact on the energy consumption of the pumping station. Most of the trash racks of large pumping stations in China are vertically installed at the inlet of the inlet flow channel. And the use of the pier of the inlet flow channel for support, thereby saving engineering investment. However, this type of structure increases the difficulty of cleaning up. Because the pump station is in the running season, there are a lot of water and grass debris, and it is necessary to manually row a boat to salvage near the trash rack, and the workload is particularly large. It is often difficult to remove water and debris in time. The current pumping station sets the trash rack at the inlet of the inlet pool at the end of the channel and makes a stepped type, which brings a lot of convenience to the cleaning. If debris accumulates in front of the trash rack and cannot be removed in time, it will block the trash rack and affect the normal flow of water into the pump. In this way, on the one hand, the head loss of the trash rack is increased, and the efficiency of the water pool is reduced; on the other hand, the flow velocity distribution in the inlet water channel is uneven, which affects the performance of the water pump. Reduce pump efficiency. Therefore, the form of the trash rack has an impact on the efficiency of the pumping station and the energy consumption of the pumping station. According to the relevant information, after some debris is accumulated in the trash rack, the water level difference before and after the trash rack is more than 1.0, and the energy loss is quite large.

The sludge in the pool will change the flow pattern of the inlet water and affect the efficiency of the pump.Timely dredging, so that the water flow is smooth, the flow state is uniform, and the efficiency of the pumping station can be improved.

Improperly designed and constructed pumping stations, such as the front pool and the inlet and outlet pools, cause vortexes and backflow in the pool. It has an adverse effect on the operation of the pump. For the lateral inlet pool built by the influence of terrain and other factors, during the operation, the front pool water flow changes direction outside the entrance of the inlet pool, and the return and dead water areas are generated on the opposite corner of the inlet pool. The water flow in the inlet pool becomes a smooth (reverse) hour hand rotation around the water pump, and the flow velocity distribution in any part cannot be uniform. When the front pool is running at a low water level, surface vortexes appear in the pool. The flow pattern in the front pool also deteriorates as the number of units turned on increases. The number of power-on units also affects the operating conditions of the pump as the pumping flow rate.

vacuum coating machine,pvd coating machine,pvd vacuum machine,vacuum ion coating machine,multi-arc ion coating machine

Before each pump is operated separately, the efficiency of the device at the first end of the front pool is higher than that at the end. As the number of units increases, the efficiency of each pump decreases, the drop of the first end pump is large, and the drop of the end pump is small. . At this time, the adverse effects can be eliminated by adding a diversion wall and a bottom sill. Generally, the height of the bottom ridge is preferably 0.3 to 0.375 (for the depth of the front pool). For the front inlet tank, if the diffusion angle is too large, the length of the front pool may be extended or the front pool may be changed into a line shape or a curved shape. If the design of the inlet pool is unreasonable, a circulation, an inlet vortex or a vortex belt is generated around the inlet, and measures for eliminating the vortex can be taken. Eliminate the surface vortex to add a cover or cover box: eliminate the bottom wave vortex can be set at the bottom of the pool to guide the water cone; eliminate the wall vortex can be placed between the water inlet to the back wall partition.