I. Current status and characteristics of automatic water supply equipment At present, the automatic pressure water supply device for pressure tanks used in micro sprinkler irrigation water supply systems generally uses self-priming centrifugal pumps, deep well pumps and submersible pumps. The self-priming centrifugal pump is characterized by compact structure and simple operation, but the manufacturing process is complicated, the self-priming time is long, the efficiency is low, and the running cost is high; although the deep well pump and the submersible pump have a certain lift, the effluent flow rate is small, especially The deep well pump adopts a long drive shaft, which consumes more steel, is expensive, and is difficult to install and repair. The automatic water supply device for centrifugal pump involved in this paper is to solve the shortcomings of the above pump type in the automatic water supply system. It is characterized by low investment, high efficiency, quick start, high flow and high flow, low operating cost, and easy mechanical maintenance and repair.
Second, the working principle
The working principle of the ordinary centrifugal pump is to use the principle of centrifugal force to work, that is, to fill the pump and the inlet pipe with water before starting, or to start with the vacuum pump. The working principle of the automatic water supply device of the ordinary centrifugal pump is: using the hand pressure well to discharge the air in the water pump and the water pump suction pipe at one time, and the water pump and the pump suction pipe are always filled with water through the facilities such as the check valve and the gate valve, at any time. Can be started.
Third, the installation process and technical requirements
1. Installation process
On the well pipe on the ground, first install the bottom valve to connect the well pipe tee, install the valve and the hand pressure well head above the well pipe; secondly connect the pump and the check valve; thirdly connect the water supply pipe 9 and the water supply valve Install an electric node pressure gauge on the pressure tank and install the power distribution facility on the ground.
2. Technical requirements
(1) The bottom valve of the well pipe is installed on the ground.
(2) Pressure tank outlet pipe elevation - pump outlet pipe elevation ≥ 0.5 m.
(3) The water level in the pressure tank before the first water supply is higher than the water level of the pump outlet pipe.
Fourth, technical analysis and benefit analysis
Technically,
(1) Compared with the ordinary centrifugal pump, the device solves the problem that the centrifugal pump starts the irrigation every time or uses the vacuum pump to pump the air;
(2) It can be started frequently to facilitate the implementation of automation;
(3) There is no self-priming process, which is quick to start and reduce the mechanical loss of the self-priming process;
(4) Compared with the self-priming centrifugal pump, the advantages of high efficiency of the ordinary centrifugal pump are utilized;
(5) Compared with the deep well pump and the submersible pump, the flow rate is large and the lift is high.
In terms of efficiency,
(1) The device solves the investment of manual or purchasing vacuum pump for the conventional centrifugal pump to start watering multiple times;
(2) Reduce the operating costs of investment in water source projects and other ancillary facilities;
(3) Easy to repair and install.
Five, the scope of application
For water-saving irrigation districts with a certain scale, ordinary centrifugal pump automatic water supply devices can be applied to rural tap water, urban tap water projects and industrial water districts. In areas where groundwater is used for irrigation, the depth of underground water pipes should not exceed 10 meters (including the depth of the pumping room).
Conclusion
Improve the performance of ordinary centrifugal pumps and broaden the scope of application.
Second, the working principle
The working principle of the ordinary centrifugal pump is to use the principle of centrifugal force to work, that is, to fill the pump and the inlet pipe with water before starting, or to start with the vacuum pump. The working principle of the automatic water supply device of the ordinary centrifugal pump is: using the hand pressure well to discharge the air in the water pump and the water pump suction pipe at one time, and the water pump and the pump suction pipe are always filled with water through the facilities such as the check valve and the gate valve, at any time. Can be started.
Third, the installation process and technical requirements
1. Installation process
On the well pipe on the ground, first install the bottom valve to connect the well pipe tee, install the valve and the hand pressure well head above the well pipe; secondly connect the pump and the check valve; thirdly connect the water supply pipe 9 and the water supply valve Install an electric node pressure gauge on the pressure tank and install the power distribution facility on the ground.
2. Technical requirements
(1) The bottom valve of the well pipe is installed on the ground.
(2) Pressure tank outlet pipe elevation - pump outlet pipe elevation ≥ 0.5 m.
(3) The water level in the pressure tank before the first water supply is higher than the water level of the pump outlet pipe.
Fourth, technical analysis and benefit analysis
Technically,
(1) Compared with the ordinary centrifugal pump, the device solves the problem that the centrifugal pump starts the irrigation every time or uses the vacuum pump to pump the air;
(2) It can be started frequently to facilitate the implementation of automation;
(3) There is no self-priming process, which is quick to start and reduce the mechanical loss of the self-priming process;
(4) Compared with the self-priming centrifugal pump, the advantages of high efficiency of the ordinary centrifugal pump are utilized;
(5) Compared with the deep well pump and the submersible pump, the flow rate is large and the lift is high.
In terms of efficiency,
(1) The device solves the investment of manual or purchasing vacuum pump for the conventional centrifugal pump to start watering multiple times;
(2) Reduce the operating costs of investment in water source projects and other ancillary facilities;
(3) Easy to repair and install.
Five, the scope of application
For water-saving irrigation districts with a certain scale, ordinary centrifugal pump automatic water supply devices can be applied to rural tap water, urban tap water projects and industrial water districts. In areas where groundwater is used for irrigation, the depth of underground water pipes should not exceed 10 meters (including the depth of the pumping room).
Conclusion
Improve the performance of ordinary centrifugal pumps and broaden the scope of application.
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