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Transmission principle of multistage pump Multistage pump is a kind of centrifugal pump, which depends on the rotation of the impeller to obtain centrifugal force. When the gas density reaches the working range of the mechanical vacuum pump and is extracted, high vacuum is gradually obtained. The multistage pump body is equipped with appropriate amount of water as the working fluid. When the impeller rotates in a clockwise direction, the water is thrown around by the impeller. Due to the centrifugal force, the water forms a closed ring of approximately equal thickness depending on the shape of the pump cavity. The inner surface of the lower part of the water ring is just tangent to the hub of the impeller, and the inner surface of the upper part of the water ring is just in contact with the tip of the blade (actually the blade has a certain insertion depth within the water ring). At this time, a crescent space is formed between the impeller hub and the water ring, and this space is divided into several small cavities equal to the number of blades by the impeller. If the lower part of the impeller 0° as a starting point, then the impeller in the rotation of 180° before the volume of the small chamber from small to large, and the end of the suction mouth is connected, at this time the gas is inhaled, when the end of the inhalation chamber and inhalation mouth isolation; When the impeller continues to rotate, the small cavity from large to small, so that the gas is compressed; When the small cavity and the outlet is connected, the gas will be discharged out of the pump. To sum up, the multistage pump is dependent on the change of pump chamber volume to achieve suction, soft shaft pump compression and exhaust, so it is a variable volume of the centrifugal pump. Related products:

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