The visual inspection should be neat and tidy, the nameplate is intact, and the grounding wire is well connected.
Disassemble the wire connecting piece in the motor terminal box, and test the insulation resistance value of the phase and phase of the motor winding and the ground between the ground and the ground with a 500V megohmmeter to be not less than 0.5 megohm.
The three-phase wires and connecting pieces in the motor terminal box should be tight and tight.
Maintenance of valves, pipes and accessories related to Forever submersible pumps:
The switches of each valve should be flexible and reliable, with no leakage inside or outside.
The check valve should be flexible and there is no water leakage inside and outside the valve.
The pressure gauge is accurate and the dial is clear.
The appearance of the pipes and accessories is neat and beautiful, without cracks, and the paint should be intact without falling off.
Jog to determine if the pump steering is correct, if it is wrong, it should be corrected.
Pumping medium: similar to clean water, liquid with a solid content of not more than 0.02%
Medium temperature: 40°C for ordinary pump and 120°C for hot water pump
Media PH value: 3 to 10
Power requirements: frequency is 50Hz, 60Hz (can be customized), rated voltage 380V [660V, 1140V, 3000V, 10KV] ± 5%
Flow range: 5 to 650 cubic meters / hour
Lift range: 2 to 1500 meters
Power range: 3 to 410kW (secondary speed motor, customizable four or six motor)
Speed: 2900 rpm (secondary speed motor)
Optional material: HT200, 304, 316, 316L, tin bronze large flow submersible pump
For the use of submersible pumps, we are mainly drainage, then I believe that many of the control of the water output and water flow are not understood, and then explain the various adjustment methods of the water flow control of the submersible pump.
1. Variable speed adjustment. Changing the speed of the submersible pump can change the performance of the pump, thus changing the operating point of the pump. This method is called variable speed mediation.
2. Reducer adjustment. After the impeller is turned, the performance of the pump will change according to a certain law, so that the operating point of the pump changes. The method by which the turning impeller changes the operating point of the pump is called the variable diameter adjustment.
3. Variable angle adjustment. Changing the installation angle of the blade can change the performance of the pump to achieve the purpose of changing the operating point of the submersible pump. This way of changing the operating point is called the variable angle adjustment of the pump.
4. Throttling adjustment. For the water pump device in which the gate valve is installed in the outlet pipe, when the gate valve is closed for a small time and the local resistance is increased in the pipeline, the pipeline characteristic curve becomes steep, and the operating point moves to the upper left along the Q-H curve of the water pump. The smaller the gate valve is closed, the greater the increased resistance and the smaller the flow. This method of changing the operating point of the pump by closing the small gate valve is called throttle regulation or variable valve regulation.
When the small gate valve is closed, the local head loss of the pipeline increases, the pipeline system characteristic curve moves to the upper left, and the pump operating point also moves to the upper left. The smaller the gate valve is closed, the greater the local head loss and the smaller the flow rate. It can be seen that the throttling adjustment not only increases the local head loss, but also reduces the amount of water, which is uneconomical. However, due to its simplicity and ease of use, it is widely used in small water pump devices and pump performance tests.
Pumps are general-purpose mechanical products. China’s pump products have approximately 450 series and more than 5,000 specifications. They are widely used in agriculture and water conservancy, construction industry, petroleum industry, power industry, shipbuilding industry, mining, metallurgical industry and environmental protection industries. . In recent years, with the rapid growth of the domestic economy, the market’s demand for pump products has also grown rapidly. According to statistics from the Industrial Pump Research Institute of Zhejiang University of Technology, the sales revenue of the pump industry in China exceeded RMB 100 billion in 2009, and the industrial output value of the industry was around RMB 108 billion, with a balance between production and sales. The regional industrial output value of the industry is: 26 billion yuan in Wenling, Taizhou, 10 billion yuan in Wenzhou Yongjia, 5 billion in Hangzhou, 15 billion in Shanghai, 6 billion in Shandong, 8 billion in Shenyang, and Dalian 6 billion yuan, 5 billion yuan in Guangzhou, 3 billion yuan in Beijing Tianjin, 2.5 billion yuan in Shijiazhuang, and Changsha 25 In recent years, the pump industry has maintained a momentum of rapid growth. In 2007, the growth rate was 23.20%, but due to global finance Affected by the economic crisis, the growth rate of the industry in 2008 has dropped slightly, to 13.5%. With the rapid development of the pump industry and the fierce market competition, the growth rate of the pump industry will tend to be stable, and it is expected that the future.
The five-year industry development rate is between 13% and 17%. The industry’s development focus will shift from quantitative growth to quality improvement.