| 摘要 |
A claw pump has: a housing forming a pump chamber; two rotating shafts arranged parallel to each other inside the housing; a pair of rotors secured respectively to the two rotating shafts inside the housing, hook-shaped pawls that mesh with each other without coming in contact being formed on the rotors; a rotational drive device for rotatably driving the pair of rotors; and an intake port and discharge port formed in the wall of the housing. The discharge port is configured from a first discharge port and a second discharge port, the first discharge port being formed in a position that, within a compression space formed by a first pocket and a second pocket merging together between the pair of rotors and the wall of the housing, is interconnected with an initial compression space formed in the initial state of a compression stroke, and the second discharge port being formed in a position that, within the compression space, is interconnected with a final compression space formed in the final stage of the compression stroke. The claw pump is provided with an opening/closing mechanism which opens the first discharge port when the pressure of the initial compression space reaches a threshold equal to or greater than atmospheric pressure, and closes the first discharge port when the pressure does not reach this threshold. |
