Low pressure centrifugal pump

1、 Product Introduction

Low pressure centrifugal pump is a centrifugal pump with a rated head of 1-100m (such as an irrigation pump). Compared to it, there are also medium pressure pumps, high pressure and ultra-high pressure pumps. According to relevant data reports, the total number of fans, water pumps, and air compressors in China is about 42 million, with an installed capacity of about 110 million kilowatts. But the actual operating efficiency of the system is only 30% to 40%, and its energy loss accounts for more than 38% of the total power generation. It can be seen from this that doing a good job in energy-saving of fans and pumps is of great significance to the development of the national economy.

2、 Application scope

In steel industry enterprises, production water can be recycled or reused after simple treatment. The process characteristics of a circulating water pump station are that the water pressure required by the water supply object is relatively stable, and the water volume also varies with the temperature changes of the season. However, the safety requirements for water supply are generally high, with a high backup rate of water pumps and a large number of water pumps. The main basis for selecting a water pump is the required flow rate, head, and their variation patterns, in order to choose a low-pressure pump.

3、 Product Features

(1) The motor has achieved soft start, and the starting current is limited within the rated current range of the motor. The starting process is very smooth, reducing the impact on the power grid; Complete protection functions;

(2) It can enhance personal and equipment safety; Eliminating mechanical vibration, extending the service life of equipment, and saving a lot of maintenance costs;

(3) Implement control and improve the level of process control; Reduce energy consumption and save operating costs;

(4) It has torque compensation function, which can automatically increase the V/f mode voltage according to the load situation to ensure the required torque. The value is automatically calculated by the frequency converter to ensure reliable operation and energy-saving effect;

(5) Communicate with the computer control system to implement remote control and real-time monitoring.

The use of variable frequency speed regulation can solve the problem of difficult control. Conventional adjustment methods such as PID or limit control can be used to regulate the system pressure and flow by adjusting the opening of the outlet valve, which cannot be well controlled for complex control objects. To achieve the effects of improving processes, reducing maintenance, lowering work intensity, and saving energy.

4、 Product function

With the rapid development of industrial production in our country, although the power industry has made significant progress, the waste of energy is quite alarming. According to relevant data reports, the total number of fans, water pumps, and air compressors in China is about 42 million, with an installed capacity of about 110 million kilowatts. But the actual operating efficiency of the system is only 30% to 40%, and its energy loss accounts for more than 38% of the total power generation. It can be seen from this that doing a good job in energy-saving of fans and pumps is of great significance to the development of the national economy.

5、 Precautions

① Do not operate without water, do not adjust the suction capacity to reduce the displacement, and do not operate at low flow rates!

② Monitor the operation process to prevent leakage of the packing box, and use new packing when replacing the packing box!

③ Ensure that the mechanical seal has sufficient flushing water flow, and excessive water flow is prohibited for water-cooled bearings!

④ Do not use too much lubricant!

⑤ Check according to the recommended cycle Establish operation records, including operating hours, adjustment and replacement of fillers, addition of lubricants, and other maintenance measures and time The suction and discharge pressure, flow rate, input power, temperature and vibration of the washing solution and bearings of the centrifugal pump should be measured and recorded regularly!

⑥ The main engine of a centrifugal pump relies on atmospheric pressure to pump water from low to high places, and atmospheric pressure can only support a water column of about 10.3 meters, so the main engine of the centrifugal pump cannot work when it is 12 meters away from the water surface!