G single screw pump stator explain

G single screw pump key components rotor, stator, stator wear resistance is directly related to the life of the pump, and the stator material is rubber, the design must consider the stator tooth curve accuracy and material selection is correct Whether or not, this directly determines the length of the stator life. The choice of rubber material formula must take into account the delivery of the medium (medium composition and medium corrosive, etc.) and the temperature of the medium, as well as the hardness of rubber, rubber in the medium expansion rate and tear strength. After the performance of rubber injection, not only can determine the life of the stator, and even affect the normal operation of the pump, for example: the transmission of oil media must choose NBR, because many rubber-resistant oil media; Rubber and so on.

Hardness is an extremely important indicator of the performance of the stator rubber: it is quantified by the degree of resistance to force when the elastic surface is subjected to a quantitative load in the vertical direction. China is the most commonly used Shore (A) hardness (measured standards GB / T 531-1983).

Usually choose the hardness of the rubber stator should be considered: medium containing particles should be taken lower, pure and neat media is desirable for higher hardness; medium viscosity, hardness may be appropriate Higher:

G single screw pump in use due to improper use or due to corrosion, wear and other reasons caused damage to the screw pump stator rubber sleeve, there is no hydraulic pressure and flow were significantly decreased phenomenon, then you need to replace the new Screw pump stator.

According to different working conditions, different media characteristics, operating conditions, the stator material and so decided, in normal use, determined by the media characteristics, usually within 1 to 2 years need to be replaced.

Stator material is affected by many factors, such as temperature, aromatics, H, S, etc. Therefore, in-depth study of stator liner materials under different environmental conditions is the key to improve the performance and working life of single screw pump. At present, four kinds of rubber materials have been developed mainly as materials for single-screw pump stator bushing, namely, Dingla rubber, super high propylene rubber content, hydrogenated nylons rubber and fluorine rubber. At present, the high content of acrylonitrile rubber developed in foreign countries can be successfully used in the oil with the temperature of 40 ℃ and the aromatic content up to 11%. The hydrogenated nBR rubber developed can adapt to the environment of carbon dioxide, hydrogen sulfide and methane (CO,. H, S content of up to 2%), and to maintain good mechanical properties, this rubber has been successfully used in high temperature 250 ℃ and the oil, fluorine rubber can adapt to higher temperatures, but Mechanical properties are not good enough so the working life is not long.

The addition of additives to the stator rubber can be very beneficial in reducing the friction between the bushes, especially in high water and gas. At present, the main use of NBR rubber as a single screw pump stator bushing material, it is difficult to adapt to a variety of oil and the environment, greatly affecting the pump range. It is suggested that different stator rubber materials be used under different working conditions, which is the fundamental way to improve the service life of single screw pump.

Select the stator rubber formulations for dynamic test can get a reliable basis, because even if the hardness close to conventional physical properties similar to the formula, the dynamic test results are still a big gap.

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