Pump impeller with novel attached blades

Abstract

The invention discloses a pump impeller with novel attached blades, which comprises blades, impellers, a wheel disk, a rear protective board, a pump cover, and a shaft seal, wherein two-step attached blades are arranged at the rear of the wheel disk, and the rear end of the wheel disk is sequentially provided with the rear protective board, the pump cover connected on a pump shaft and the shaft seal. Additional centrifugal force generated in the rotation of the novel attached blades impeller is used for generating reverse pressure, so that the difference of the pressure at two sides of the impeller can be reduced, and the axial force of the impeller is reduced, the differential pressure at two sides of a sealing part is reduced, leakage rate is reduced, the efficiency of the impeller is improved at a certain extent, the problem that a high pressure single suction pump generates larger axial force due to high pressure is solved, the service life of a bearing is prolonged, and cost is saved for a user; the reduction of positive pressure at the shaft seal helps to prevent a slurry medium from leaking, a stock pump is improved in operation reliability and use tightness on the whole, and environment protection and energy conservation requirements are met. The pump impeller with the novel attached blades has strong commonality, and can be applied to fully opened, half opened or closed impellers.

Description

technical field [0001] The invention relates to the technical field of pump impeller structures, and can be widely used in the technical field of single-stage centrifugal pumps such as multi-medium water pumps, slurry pumps, and chemical pumps. Background technique [0002] The structural type of the centrifugal pump is that the inlet pipe of the pump is along the direction of the impeller shaft, and the outlet pipe is at a 90-degree angle to the impeller shaft. When the impeller rotates and transports the medium, the speed and direction of the medium’s inlet and outlet are changed, especially The axial speed becomes 0. According to the principle of momentum conservation, the medium will exert a large axial force on the runner, and the axial force will be transmitted to the bearing and sealing system through the main shaft. Excessive axial force will cause the bearing and seal Severe wear and tear greatly shortens the service life of the pump. The general pump impeller redu...

AI Technical Summary

Problems solved by technology

[0002] The structural type of the centrifugal pump is that the inlet pipe of the pump is along the direction of the impeller shaft, and the outlet pipe is at a 90-degree angle to the impeller shaft. When the impeller rotates and transports the medium, the speed and direction of the medium’s inlet and outlet are changed, especially The axial speed becomes 0. According to the principle of momentum conservation, the medium will exert a large axial force on the runner, and the axial force will be transmitted to the bearing and sealing system through the main shaft. Excessive axial force will cause the bearing and seal Severe wear and tear, greatly shortening the service life of the pump

The general pump impeller reduces the axial force by processing multiple decompression holes on the impeller disc. If the decompression holes are too large, it will cause a large amount of leakage of the medium, which will significantly reduce the efficiency of the impeller. If the decompression holes are too small, The axial force on the impeller will still be large

The axial force can also be reduced by installing additional blades at the bottom of the wheel. When the impeller rotates, the attached blades generate a certain centrifugal force, thereby generating reverse pressure behind the impeller, which can reduce the pressure difference on both sides of the impeller, so It will also reduce the axial force of the impeller, but the existence of the attached blade will increase the volume loss and disc loss of the impeller, and significantly reduce the impeller efficiency

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