A flexible impeller pump designed for use in dispensing a flowable food product includes a cover, impeller assembly and a pump body that are assembled to create the pump without other separate components. The components can be permanently connected to each other to create a disposable pump or can be disassembled for cleaning and reuse. The impeller assembly includes an impeller shaft and a flexible impeller molded over the impeller shaft to prevent separation. The impeller assembly is received within the pump body and the cover is secured to the pump body. The cover includes a seal that is molded over the pump body to prevent separation of the seal from the cover. The impeller shaft extends through the pump body and is coupled to a drive shaft of an electric motor that is operable to drive the impeller pump.

A pump for conveying a medium having a suction-side inlet, a pressure-side outlet, a suction chamber, a conveyance housing. The conveyance housing having a pressure chamber in which there is a prevailing pressure chamber pressure, and a carrier shaft arranged in the conveyance housing on which a transport element is arranged for conveying the medium along a direction of conveyance from the suction chamber into the pressure chamber. A pressure disc is arranged in an axially fixed manner on the carrier shaft, wherein one side of the pressure disc is fluidly connected to the pressure chamber and exposed to a compressive force acting in the direction of conveyance.

A circulation pump mechanism of a mechanical seal device includes a rotor having mounting grooves formed therein, vanes provided in the mounting grooves, a plurality of biasing members provided in a space on a deep side with respect to the vane in each mounting groove and configured to bias each vane in a direction in which the vane is caused to project, a housing having an inner circumferential surface which is eccentric with respect to an outer circumferential surface of the rotor and on which a tip of each vane slides, a pump chamber demarcated on a leading side in a rotation direction of the rotor with respect to the tip of each vane between the outer circumferential surface of the rotor and the inner circumferential surface of the housing, and a communication flow path formed in the rotor and providing communication between the space and the pump chamber.

A mechanical seal device includes: a seal case surrounding a rotary shaft of a rotary machine and separating a machine inner area and a machine outer area of the rotary machine; a mechanical seal placed between the seal case and the rotary shaft; a sealing liquid chamber which is formed in the seal case and into which a sealing liquid for lubricating a sliding portion of the mechanical seal is introduced; and a circulation pump mechanism configured to circulate the sealing liquid in the sealing liquid chamber. The circulation pump mechanism includes: an annular rotor having a mounting groove open at an outer circumferential surface thereof; a vane provided in the mounting groove; a spring provided on a deep side with respect to the vane in the mounting groove; and a retaining member provided on the deep side with respect to the vane in the mounting groove.

A seal assembly for sealing a power input shaft of a progressive cavity pump can include a seal housing arranged around the power input shaft, the seal housing can include a mounted portion, mounted to the progressive cavity pump, a removable portion, removably coupled to the mounted portion, which can be configured to apply a compression force to a seal within the seal assembly, and a sealing element, which can be configured to seal an interface between the mounted portion and the removable portion. The seal housing can be configured so that a portion of the mounted portion can be in direct contact with a portion of the removable portion.

There is provided a scroll compressor capable of stopping breakage even when a rear bearing supporting a shaft has an outer diameter dimension larger than an outer diameter dimension of a shaft seal. The scroll compressor includes a rear bearing 18 press-fitted and fixed to the center casing 6 to support the shaft 14, and a shaft seal 58 disposed on the through hole 17 side of the rear bearing 18. A movable scroll 22 is revolved with respect to the fixed scroll 21. The rear bearing 18 has an outer diameter dimension larger than that of the shaft seal 58, and the shaft seal 58 has a separate structure from the rear bearing 18. Between the rear bearing 18 and the shaft seal 58, a shaft seal fixing plate 64 having a diameter larger than that of the shaft seal 58 is interposed.

A pump having a pumping module and a motor module. The motor module has an electric motor and a first rotatable shaft driven by the electric motor. The pumping module has a pump housing with an internal pumping chamber, a drive shaft opening, and inlet and outlet ports in flow communication with the pumping chamber. The pumping module also comprises a pumping mechanism disposed within the pumping chamber driven by a second rotatable shaft extending through the drive shaft opening and coupled to the first rotatable shaft by a polymeric coupler.

There is provided a scroll compressor capable of stopping breakage even when a rear bearing supporting a shaft has an outer diameter dimension larger than an outer diameter dimension of a shaft seal. The scroll compressor includes a rear bearing 18 press-fitted and fixed to the center casing 6 to support the shaft 14, and a shaft seal 58 disposed on the through hole 17 side of the rear bearing 18. A movable scroll 22 is revolved with respect to the fixed scroll 21. The rear bearing 18 has an outer diameter dimension larger than that of the shaft seal 58, and the shaft seal 58 has a separate structure from the rear bearing 18. Between the rear bearing 18 and the shaft seal 58, a shaft seal fixing plate 64 having a diameter larger than that of the shaft seal 58 is interposed.