With the growth of population and the development of economy, energy problem has been paid more and more attention, especially in China, energy conservation has become more and more important. In order to strengthen the energy-saving concept of enterprises, China is likely to launch a more stringent price lever for power consumption in production. Therefore, energy conservation has become an important direction for the development of gear pumps.
As a main type of pump, gear pump has undergone many important developments and changes. The early gear pumps were all hydraulic. Due to the needs of environmental protection and energy saving, as well as the mature application of servo motors and the substantial decline in prices, there have been more and more all electric precision gear pumps in recent years. In order to analyze this development trend, I have listed the comparative characteristics among them:
The all electric gear pump has a series of advantages, especially in environmental protection and energy saving. It is reported that by the end of December 2014, the power saving of the more advanced all electric gear pump could reach 70%. In addition, the servo motor injection control accuracy is high, the speed is stable, and it can be adjusted at multiple levels. However, the service life of the fully electric gear pump is not as good as that of the fully hydraulic gear pump. To ensure the accuracy of the fully hydraulic gear pump, the servo valve with closed-loop control must be used, and the servo valve is expensive, resulting in an increase in cost.
The full hydraulic gear pump has many unique advantages in forming precision and complex products. It has developed from the traditional single cylinder liquid filling type and multi cylinder liquid filling type to the two plate direct pressure type, of which the two plate direct pressure type is the most representative, but its control technology is difficult, the machining precision is high, and the hydraulic technology is difficult to master.
Electric hydraulic gear pump is a new type of gear pump integrating hydraulic and electric drive. It combines the high performance of all hydraulic gear pump and the energy-saving advantages of all electric gear pump. This composite gear pump combining electric and hydraulic has become the development direction of gear pump technology.
