Centrifugal pump and pump cover

Abstract

The invention relates to a centrifugal pump and a pump cover correspondingly. The centrifugal pump is provided with a separating impeller arranged between a main impeller and a vacuum impeller. A plurality of separating impeller guiding rib strips outwards sending out in the radial direction from a separating impeller annular rib strip surrounding a center hole of the separating impeller are arranged on the side, facing a baffle, of the separating impeller. The centrifugal pump is further provided with the pump cover, the pump cover is fixed to a pump body, and a pump cover center opening is formed in the center of the pump cover. A pump cover annular rib strip which concentrically surrounds the pump cover center opening and a plurality of pump cover guiding rib strips are arranged on the side, back to a pump inlet and facing the separating impeller, of the pump cover. All the pump cover guiding rib strips extend towards the direction of the pump cover center opening from the pump cover annular rib strip correspondingly. Connecting lines of the two radial ends of all the pump cover guiding rib strips have radians forwards protruding in the rotating direction of a main shaft.

Description

technical field [0001] The invention relates to a centrifugal pump device for pumping gas-containing medium, in particular to a centrifugal pump device with a built-in liquid ring vacuum pump. The invention also relates to a pump cover for use in said centrifugal pump. Background technique [0002] Under the prior art, the centrifugal pump sends water out by the action of centrifugal force, and the impeller throws the water outward to form a vacuum in the center. If the pump is infiltrated with gas during operation, because the density of the gas is lower than that of the liquid, the centrifugal force generated is small, so the gas cannot be thrown out, but accumulates in the center of the impeller, which causes the vacuum formed in the center of the impeller to be insufficient to suck the liquid inside the pump. In this way, although the impeller is constantly rotating at this time, the centrifugal pump cannot transport liquid because it loses its self-priming ability. Th...

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Problems solved by technology

The more gas that is removed, the better the pumping performance of the pump, otherwise gas trapping will seriously reduce the performance of the pump and in extreme cases may cause the pump to fail to operate

[0004]At present, the traditional methods of pumping medium with high gas content include: one is to remove the gas before the gas-liquid mixed medium enters the pump, which requires additional equipment; the other is Ordinary self-priming pumps are used as degassing pumps, but ordinary self-priming pumps do not have a separation device. During the degassing process, because the liquid ring vacuum pump is working, the pumped medium will be continuously sucked into the vacuum pump, and then discharged by the vacuum exhaust pipe, resulting in The waste of pumping medium also increases the energy consumption of the vacuum pump. If there are hard particles entering the vacuum pump, it will also cause wear and damage to the vacuum impeller.

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