Double suction pump with high suction pressure

The utility model discloses a double suction pump with a high suction pressure. The double suction pump comprises a pump shaft, a first bearing pressure cover, a bearing box body, a second bearing pressure cover, a pump body, a throat bushing, a first impeller spacer sleeve, an impeller, an inter-stage shaft sleeve, a second impeller spacer sleeve, a first pump cover, another throat bushing, a first adjustment spacer sleeve, a first bearing, a third bearing pressure cover, a second adjustment spacer sleeve, a second bearing, a first inner ring spacer sleeve, a second inner ring spacer sleeve and a second pump cover, wherein the impeller is mounted on the pump shaft and positioned through the inter-stage shaft sleeve, the first impeller spacer sleeve and the second impeller spacer sleeve; the throat bushings and the inter-stage shaft sleeve are mounted on the pump body respectively; the bearing box body is connected with the first pump cover and the second pump cover; and the first pump cover and the second pu