Patent ID: 7537441

Claim:
A gear pump for discharging fluid, the gear pump comprising: a housing defining an accommodation chamber including an opening, the fluid flowing into the accommodation chamber at a suction position and flows out of the accommodation chamber at a discharge position; a drive gear and a driven gear, arranged in the accommodation chamber, for transferring the fluid from the suction position to the discharge position when rotated, the drive gear and the driven gear each having a projection; a first sealing element, contacting at least part of the drive gear and the driven gear, closing the opening of the accommodation chamber, and preventing the fluid from flowing back to the suction position from the discharge position; and a second sealing element, arranged at an outer side of the first sealing element, for sealing the accommodation chamber in a hermetic state, wherein the first sealing element is positioned by contacting only with the projections of the drive gear and the driven gear and has no direct contact with the housing.