Singe-stage double-suction split case pump with good sealing performance

Abstract

The invention relates to the field of split case pumps, in particular to a single-stage double-suction split case pump with the good sealing performance. The single-stage double-suction split case pump comprises a front bearing seat, a rear bearing seat and a pump shaft penetrating the front bearing seat and the rear bearing seat. The pump shaft is sleeved with a shaft sleeve. The middle portion of the pump shaft is sleeved with an impeller and a pump body matched with the impeller. The pump body is connected with the front bearing seat and the rear bearing seat through fastening pieces. A sealing component is arranged between the pump body and the impeller. Pump covers are arranged on the two sides of the pump body. The pump covers on the two sides are matched with a padding sealing device and a mechanical sealing device correspondingly. The invention aims at providing the single-stage double-suction split case pump with the good sealing performance, through the specific padding sealing device and the impeller sealing component, the good sealing effect is achieved, meanwhile the bearing span can be lowered, an impeller sealing ring is prevented from falling off, and normal operation of the pump is guaranteed.

Description

Technical field [0001] The invention relates to the field of split pumps, in particular to a single-stage double-suction split pump with good sealing performance. Background technique [0002] The split pump is a hydraulic component that converts low-pressure medium into high-pressure medium. Therefore, it needs good sealing performance, and the seal of the pump body is an important part of the seal of the split pump. [0003] Existing split pumps generally purchase S and SH split pump structures. Due to the special hydraulic model of split pumps, water flows into the impeller at the same time from both sides of the impeller, resulting in a wider suction chamber, resulting in a larger bearing span. When the distance is large, the radial force generated by the impeller will act on the shaft when the pump is running, forming a large deflection. The larger the bearing span, the greater the deflection; after the shaft is deformed due to the deflection, mechanical fatigue is likely to o...

AI Technical Summary

Problems solved by technology

[0003] The existing split pumps generally purchase S and SH type split pump structures. Due to the special hydraulic model of the split pump, the water flow is sucked into the impeller from both sides of the impeller at the same time, so the suction chamber is wider, resulting in a larger bearing span. When the bearing span When the distance is large, the radial force generated by the impeller will act on the shaft when the pump is running, forming a large deflection. The larger the bearing span, the greater the deflection; the shaft is prone to mechanical fatigue after deformation due to deflection ;The bearing will also be in an abnormal stress state due to the deflection generated by the shaft, so the bearing is prone to heat, the bearing life is shortened, and even serious product quality problems such as broken shaft occur.

[0004] At the same time, in the traditional design, the positioning method of the impeller seal ring is fastened by the seam screw. The seam screw hole needs to be equipped with a hole in the gap between the impeller and the impeller seal ring. Due to the difference in material between the impeller and the impeller seal ring, This drilling is difficult to operate; after tightening with the seam screw, due to the pressure difference and centrifugal force on both sides of the impeller seal ring during the operation of the pump, the seam screw is easy to fall off, resulting in the impeller seal ring coming out and damaging the pump

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