When the water pump is pumped from the water tank, if the self-irrigation water-absorbing method is adopted, the water-absorbing pipe can be filled with water all the time. When the water pump is started, the time for irrigation and exhausting can be saved, and the pump can be put into operation quickly, which improves the automation and reliability of the pump start-up. degree.
The commonly used self-irrigation method is to make the elevation of the water pump axis lower than the working water level of the pool. This method is often used in buildings with a basement. When it is deployed, the pump room is located in the basement, and the pool is located next to the basement pump room or outdoors. In this method of water absorption, the working water level of the pool is higher than the elevation of the water pump axis, so that the water suction pipe is always filled with water, and the water pump can be automatically and quickly started.
For buildings without a basement, it is difficult to use the self-irrigation method described above. Because of this type of construction, the pump room is generally located on the ground floor. If a pool is installed next to the pump room on the ground floor, especially a large-scale fire tank, it will occupy a large amount of ground floor use area, and construction units will generally not agree.
In this case, the pool is generally set outside the building and buried under the ground. As a result, the working water level of the pool is lower than the elevation of the water pump axis, and the water pump cannot achieve self-irrigation. In this case, the following methods can be used to solve this problem.
The first method is to install a suction bottom valve at the end of the suction pipe of the pump. The suction bottom valve is actually a kind of check valve, which ensures that the water flow can only enter the suction pipe and not backflow. Therefore, if the suction pipe is filled with water, although the water pump axis elevation is higher than the working water level of the pool, it is due to the absorption of water. The role of the valve, the water inside the suction pipe will not flow into the pool, so that the suction pipe is always filled with water to ensure that the pump can automatically start quickly. The reliability of this water-absorbing method is affected by the quality of the water-absorbing bottom valve. For example, if the valve is not closed tightly and water leaks, the water in the suction pipe will slowly flow into the pool. After a long time, there will be no water in the suction pipe, causing the pump to start. Artificial irrigation is required.
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