Abstract: An apparatus for controlling performance of a fluid machinery by controlling rotational speed of the fluid machinery. A performance regulating device for the fluid machinery includes a frequency converter, a casing for housing the frequency converter so as to ensure being airtight against an atmosphere, an input, and an output connected to the casing so as to ensure being airtight against the atmosphere.

Abstract: The present invention relates to a pump for delivering under pressure various liquids including water. The temperature of the handled liquid in a pump casing (1) is detected by a thermistor (51). If an increase in the temperature per time of the handled liquid is greater than a predetermined value, then the pump is shut down, or the flow rate or pressure of the liquid is changed depending on the temperature of the handled liquid detected by the thermistor based on a predetermined control program.

Abstract: A fluid machinery for generating a pressure by rotating an impeller with a motor has a frequency converter (F) for supplying electric power to the motor, a detector for detecting a frequency and a current value, and a program for specifying in advance the relationship between the frequency and the current value. A frequency and a current value in an actual operation are compared with the specified program, and the frequency generated by the frequency converter (F) is varied so that an operating point of the fluid machinery approaches the specified program.

Abstract: The present invention relates to a fluid machinery for generating a pressure by rotating an impeller with a motor. The fluid machinery has a frequency converter (F) for supplying electric power to the motor, a detector for detecting a frequency and a current value, and a program for specifying in advance the relationship between the frequency and the current value. A frequency and a current value in an actual operation are compared with the specified program, and the frequency generated by the frequency converter (F) is varied so that an operating point of the fluid machinery approaches the specified program.

Abstract: A bearing device for use in a pump which has a bearing member composed of a hard and brittle material made of ceramic such as silicon carbide (SiC). The bearing device has a bearing housing, a ceramic bearing member housed in the bearing housing and supporting a shaft, an elastic material around the ceramic bearing member for preventing the ceramic bearing member from being broken, and a thrust collar for preventing fragments of the ceramic bearing member from being scattered when the ceramic bearing member is broken.

Abstract: A pump having an improved fluid passage has an inner casing which houses at least one impeller and an outer casing which houses the inner casing. The pump also has a communicating pipe disposed outside of the outer casing for guiding a main flow of a fluid being handled from a space defined in the outer casing into another space defined in the outer casing.

Abstract: A full-circumferential flow pump includes an outer cylinder and a motor housed in the outer cylinder. The motor has a motor frame, a stator disposed in the motor frame, a main shaft, a rotor mounted on the main shaft and rotatably disposed in the stator. The outer cylinder defines an annular space defined around the motor frame, the outer cylinder having a pump suction port defined therein for introducing a fluid therethrough into the annular space. A pump unit is mounted on an end of the main shaft, and the outer cylinder has a discharge window defined therein for discharging a fluid from the pump unit. A discharge case is mounted on an outer circumferential surface of the outer cylinder in communication with the discharge window, the discharge case having a pump discharge port.

Abstract: A group of full-circumferential-flow pumps has a group of motors each comprising a main shaft, a rotor mounted on the main shaft, a stator disposed around the rotor, a cylindrical outer motor frame fitted over the stator, and an outer cylinder disposed around the cylindrical outer motor frame with an annular space defined therebetween, a group of pump parts oriented in opposite directions to meet different directions in which the main shafts of the motors rotate, and a group of frequency converters for energizing the motors to rotate at high speeds.

Abstract: A full circumferential flow double suction pump has a pair of pump assemblies mounted on respective opposite ends of the rotor shaft of the motor mounted within an outer frame casing. The motor is positioned within an outer cylinder such that an annular space is defined between the outer frame casing and the outer cylinder. A discharge port connects with the annular space. A pair of cylindrical cup-shaped pump casings are connected to respective opposite ends of the outer cylinder for housing the pump assemblies. A header pipe connects the suction nozzles of the cylindrical cup-shaped pump casings to each other and has a suction port defined therein for introducing a fluid therethrough and through the suction nozzles into the pump assemblies.

Abstract: A canned motor pump has relative small size and low output power for use in, for example, circulating warm water. The canned motor pump comprises a motor stator, a stator can disposed radially inwardly of the motor stator and in which a fluid passage of a main flow of a pumped fluid is defined, a rotatable shaft, a motor rotor fixedly supported on an end of the rotatable shaft and disposed radially inwardly of the stator can, a pump impeller mounted on an opposite end of the rotatable shaft, and all radial bearings for supporting the rotatable shaft disposed between the motor rotor and the pump impeller.

Abstract: A full-circumferential flow pump includes a motor having a stator, a shaft rotatably disposed in the stator, and a rotor mounted on the shaft for rotation relative to the stator, an outer frame barrel disposed around the stator, an outer cylindrical pump casing disposed around the outer frame barrel with an annular space defined therebetween, and a pump assembly mounted on an end of the shaft for pumping a fluid into the annular space or pumping a fluid introduced from the annular space. The full-circumferential flow pump further includes an inner casing provided in the outer cylindrical pump casing for accommodating the impeller and a resilient seal disposed between the outer cylindrical pump casing and the inner casing for preventing a pumped fluid in the outer cylindrical pump casing from leaking towards a suction side of the impeller.

Abstract: A pump control system has a pump unit composed of a turbo pump, a motor for operating the turbo pump, and a frequency/voltage converter for generating a frequency and a voltage to energize the motor. The rotational speed of the turbo pump is varied in order to equalize the current of the motor to a constant current irrespective of the head of the pump. The pump can be operated to take fully advantage of the current capacity of the motor.

Abstract: A full-circumferential flow pump includes a motor having a stator, a shaft rotatably disposed in the stator, and a rotor mounted on the shaft for rotation relative to the stator, an outer frame casing disposed around the stator, an outer cylindrical pump casing disposed around the outer frame casing with an annular space defined therebetween, and a pump assembly mounted on an end of the shaft for pumping a fluid into the annular space. The outer cylindrical pump casing has a suction window for introducing a fluid therethrough. A suction case is mounted on the outer cylindrical pump casing for introducing a fluid therethrough and through the suction window into the pump assembly, the suction casing having a suction port defined therein.