| 主权项 |
1. A rotating pump comprising:
a drive shaft; a rotor assembly made up of an outer rotor and an inner rotor, the outer rotor having inner teeth formed on an inner periphery thereof, the inner rotor having outer teeth formed on an outer periphery thereof and being rotated by the drive shaft around an axis defined by the drive shaft, the outer teeth meshing with the inner teeth of the outer rotor to define a plurality of cavities; a casing in which the drive shaft is installed, the casing including a rotor chamber in which the rotor assembly is mounted to be rotatable with a gap formed between an inner peripheral surface of the casing which faces the outer rotor and an outer peripheral surface of the outer rotor, the casing having an inlet port from which fluid is sucked into the rotor assembly and an outlet port from which the fluid is discharged with rotation of the rotor assembly; a first and a second recess formed in the inner peripheral surface of the casing which is exposed to the gap; and a first and a second sealing member which are disposed in the first and second recesses, respectively, to define within the gap a low-pressure region leading to the inlet port and a high-pressure region leading to the outlet port, each of the first and second sealing members being made up of a seal functioning portion and an elastically pressing portion, the seal functioning portion being placed in contact with the outer periphery of the outer rotor and a low-pressure side surface that is a portion of an inner wall surface of a corresponding one of the first and second recesses which is closer to the low-pressure region than to the high-pressure region to establish a difference in pressure between the low-pressure region and the high-pressure region, the elastically pressing portion being located closer to a bottom of a corresponding one of the first and second recesses than the seal functioning portion is and working to press the seal functioning portion against the outer periphery of the outer rotor, the seal functioning portion including a resinous member and a deformation-suppressing member, the resinous member being placed in contact with the outer periphery of the outer rotor and the low-pressure side surface of the inner wall surface of a corresponding one of the first and second recesses to establish the difference in pressure between the low-pressure region and the high-pressure region, the deformation-suppressing member being made of material which is more rigid than that of the resinous member and located closer to the low-pressure region than the resinous member is, a boundary between a surface of the deformation-suppressing member which faces the low-pressure side surface and a surface of the resinous member which faces the low-pressure side surface being located inside a corresponding one of the recesses. |
