Chemical centrifugal pump with balanced axial force and high inlet pressure

Abstract

The invention relates to a chemical centrifugal pump with balanced axial force and high inlet pressure. The chemical centrifugal pump comprises a pump body, a pump shaft, an impeller and a pump cover, wherein a water inlet is formed in one end of the pump body; a water outlet is formed in the pump body; the pump shaft is in penetrating connection with a bearing support; and the pump cover for encapsulating the other end of the pump body extends into the pump body and is connected with the impeller. The chemical centrifugal pump is characterized in that a returned water outer pipeline is guided out from the water outlet, wherein an overflow valve is arranged on the returned water outer pipeline; and the returned water outer pipeline communicates to a pump cover high-pressure area between the pump cover and the impeller through the pump cover. The chemical centrifugal pump is simple and compact in structure, can effectively ensure that axial force of the centrifugal pump is balanced, and is convenient and stable in control.

Description

technical field [0001] The invention relates to a centrifugal pump, in particular to an axial force balanced high inlet pressure chemical centrifugal pump. Background technique [0002] The axial force balance design of a single-stage centrifugal pump is based on the balance under high pressure conditions. When the inlet is not pressurized or the pressurized pressure does not reach the design pressure, the axial force of the impeller is unbalanced. Generally, the axial force balance of centrifugal pumps with low inlet pressure is mainly through the design of the balance ring + balance hole, or the design of the back blade, or the design of the back impeller. Satisfying, even counterproductive. The imbalance of axial force will directly affect the service life of the bearing, including the excessive temperature rise of the bearing, which in turn will affect the service life of the pump bearing, as well as the vibration and stability of the pump. Contents of the invention ...

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Problems solved by technology

Generally, the axial force balance of centrifugal pumps with low inlet pressure is mainly through the design of the balance ring + balance hole, or the design of the back blade, or the design of the back impeller, etc., but such a design is not suitable for the axial force balance design under the condition of high inlet pressure satisfying, even counterproductive

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