Vane pump is also called a vane pump, which is a type of positive displacement pump. It depends on the periodic changes of the volume (called the elementary volume) formed between the pump body, the pump cover, the eccentric rotor and the vane Suction, drainage liquid pump. So what are the special problems of the pump? Vane pump special problems (1) Vane pump high pressure chamber and low pressure chamber seal seat AB seal. Therefore, the angle between the seal boss should be greater than the angle between the two slides. The radial end of the vane should be close to the cylinder wall, to this end, the high-pressure fluid can pass into the vane root space to achieve self-tight seal. In this way, when the vane is in the liquid absorption zone, the pressure on the AC segment of the pump body is large due to the small pressure in the liquid medium and the large root pressure, and the working face of the pump body is easy to wear. (2) As the pressure difference between the suction area and the hydraulic area, the shaft and the bearing are subjected to the unbalanced radial force. Only double acting vane pump radial force is balanced. In addition, the force is not equal on both sides of the vane, especially when the vane enters the high pressure area from the low pressure area, the high pressure (discharge pressure) and the low pressure (suction pressure) are on one side of the vane. Therefore, the slider should have sufficient strength, the thickness should not be too thin, stretching can not be too large. Under the action of the radial pressure, the vane generates a local high temperature at the contact of the vane with the pump cylinder, which may cause local annealing, resulting in rapid wear of the vane. Therefore, the vane is generally made of high-speed steel, there is still some hardness at high temperatures. Pump cylinder easy to wear in the low pressure area, overhaul the cylinder can be inverted, so that part of the original high pressure area to the low pressure area position to extend the service life. (3) vane pump also exists in the dead volume, there are also trapped oil problems, AB section in the pump can be opened to open the groove side solution. (4) The difference (R-r) between vane pump pump cylinder radius R and rotor radius r is generally 40% of the vane length. Rr difference is too large, the vane extends out of the rotor distance increases, the vane easily wedged; Rr difference is too small, the vane stretching distance decreases, the pump flow decreases, the relative mass of the pump increases. To prevent vanes from wedging, slide the vanes forward 6 ° -13 ° in a one-way vane pump. The above is a special issue vane pump, these are for your reference only. Read more: China Building Water Exhibition Pump Valve Tube Fittings Exhibition Water Expo Xiamen Maritime Exhibition Internet + Forum Yiwu Expo Industry Interconnection (Xiamen) Technology Co., Ltd. Asia Pump Network Editor: He Duanhui (QQ / WeChat:) http://beng.liuti.cn/ (service hotline:)
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