Water ring vacuum pump selection considerations

First, determine the type of water ring vacuum pump The type of water ring vacuum pump is mainly required by the work of gas, vacuum or exhaust pressure may be. Water ring vacuum pump work, you need to pay attention to the following two aspects: 1. As far as possible in the high-performance area, that is, critical vacuum or critical discharge pressure in the region. 2. Avoid operating near maximum vacuum or maximum exhaust pressure. Operating in this area is not only inefficient but also unstable and prone to vibration and noise. Cavitation occurs frequently in vacuum applications where the vacuum is high, and the obvious hallmark of this phenomenon is noise and vibration in the pump. Cavitation can cause damage to the pump body, impeller and other parts, so that the pump can not work. According to the above principle, when the pump required vacuum or gas pressure is not high, priority can be selected in the single-stage pump. If the vacuum or exhaust pressure is high, the single-stage pump often can not meet, or require the pump at higher vacuum conditions still have a larger amount of air, which requires the performance curve at a higher degree of vacuum is flatter, the choice of two Pump. If the degree of vacuum required in -710mmHg above, the optional water ring - air pump or water ring - Roots vacuum unit as a vacuum device. If only for the vacuum pump, the single-use pump is better. Because the single-action pump is simple in construction, easy to manufacture and maintain, and has good resistance to cavitation under high vacuum conditions. If only for larger compressor use, then the choice of double-acting pump more appropriate. Because the dual-acting pump has the advantages of large gas volume, small size and light weight, the radial force can be automatically balanced, the shaft is not prone to fatigue fracture, and the pump has a longer service life. Second, according to the amount of gas required for system selection Water ring vacuum pump After the initial selection of the type of water ring vacuum pump, for the vacuum pump, but also according to the amount of gas the system to choose the pump model. About pumping speed selection and pumping time calculation can refer to: vacuum calculation formula.

Art Paint Brush Set

Art Oil Paint Brush: it is a special painting tool for oil painting. Generally, the pen holder is mostly wooden, the pen hair is bristle, and there are also a few Langhao and chemical fiber. According to the shape of the pen head, it is divided into round head pen, flat head pen, fan-shaped pen and row pen. According to the size, it is divided into 12 models, ranging from small to large 1#- 12#. In addition, there are some large models. Oil painting pen plays the most basic function in the process of oil painting. A handy brush can bring interest to the artist's work. The choice of oil painting pen depends on the painting technique. The functions of brushes with different textures, shapes and models are also different.

Art Paint Brush Set,Artist Paint Brush Set,Gouache Paint Brushes,Watercolor Paint Brush Set

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