Pump device

A pump device, comprising:

• a housing defining an insertion hole through which a rotation shaft that rotates around a predetermined axis is inserted, an inlet and an outlet for a fluid which open on one end side in an axial direction of the axis, and an internal passage through which the fluid passes;
• and
• a first pump element arranged near the one end side and a second pump element disposed adjacent to the first pump element so as to be rotationally driven by the rotation shaft within the housing,
• wherein the internal passage comprises a first suction passage communicating from the inlet to a first suction port facing a first end surface of the first pump element directed to the one end side, a first discharge passage communicating from a first discharge port facing the first end surface to the outlet, a second suction passage passing around the first pump element to communicate from the inlet to a second suction port facing a second end surface of the second pump element, and a second discharge passage passing around the first pump element to communicate from a second discharge port facing the second end surface to the outlet,
• wherein the housing comprises a passage member which defines the one end side and comprises the inlet and the outlet, a first housing member which is connected to the passage member to house the first pump element, and a second housing member which is connected to the first housing member to house the second pump element,
• wherein the passage member comprises an outer member that is joined to an applicable object, and an intervening member that is interposed between the outer member and the first housing member,
• wherein the outer member comprises the inlet, the outlet, a part of the first suction passage, a part of the first discharge passage, a part of the second suction passage, and a part of the second discharge passage,
• the intervening member comprises the first suction port, the first discharge port, a part of the second suction passage, and a part of the second discharge passage,
• the first housing member comprises the insertion hole, a blocking wall that blocks between the first pump element and the second pump element, a part of the second suction passage, and a part of the second discharge passage, and
• the second housing member comprises the insertion hole, the second suction port, the second discharge port, a part of the second suction passage, and a part of the second discharge passage.