A circulation system is provided to move a coolant liquid in a coolant chamber (44) formed between a housing (40) and a motor shroud (42) of a pump (10) for a fluid being worked upon. The circulation system has a coolant impeller (54) in a coolant impeller chamber (56). The coolant impeller is driven by a drive shaft (20) that also drives a primary impeller (24) that moves the fluid being worked on. The coolant impeller is positioned along the drive shaft between the motor and the primary impeller. The coolant impeller has a wide inner portion (74) and a peripheral base disk (76) that define a radially-offset suction eye (72) and support a plurality of impeller blades (70). A seal spring (86) compressively acts on the inner portion, providing a mechanical seal.

A motor driven pump with a waterproof structure is provided. The pump includes a motor, a pump body, a pump shaft, a shaft seal, and a first blocking member. The motor includes a motor housing. The pump body includes an impeller and a first drainage chamber having a first drainage outlet. The pump shaft includes a first end and a second end located opposite to the first end, wherein the first end is connected to the motor and the second end is connected to the impeller. The shaft seal forms a fluid seal with the pump body to prevent a fluid in the pump body from leaking into the motor. The first blocking member is located between the motor and the shaft seal and is connected in a sealed and a fixed manner to the pump shaft for conjoint rotation. The first blocking member is positioned to block fluid leaking from the shaft seal.

A multi-stage centrifugal pump includes a pump casing, in which a shaft (8) carrying an impeller is rotatably arranged. The pump casing has a pump casing foot part (2) that includes a reversibly closable maintenance opening (60), via which a bearing and/or seal (20, 25), which is arranged at a shaft end within the pump casing, is accessible and exchangeable.

A sliding bearing having a sealing arrangement for water pumps, configured to radially mount and seal a shaft in a housing between a wet side and a dry side. The sliding bearing and the sealing arrangement include a sliding bearing bushing made of a sintering material for radial mounting of the shaft, and a dry-side shaft seal arranged between the sliding bearing bushing and the dry side. A wet-side shaft seal is arranged between the wet side and the sliding bearing bushing and a lubricant reservoir with a substrate, made of a non-sintered material, which is porous in at least some sections, is arranged at least between the wet-side shaft seal and the sliding bearing bushing. The lubricant reservoir includes, in pores of the substrate, a lubricant insoluble in water. A volume of the lubricant reservoir and a volume of a lubricant filling take up a total volume of spaces between the wet-side shaft seal and the dry-side shaft seal.

A vertical pump structure is adapted to be mounted on a water cooling tank. The vertical pump structure comprises a pump casing, an upper shaft seal, a shaft and a lower shaft seal assembly. An upper annular flange and a lower annular flange are formed on an inner surface of the pump casing. A drain space is formed between the two annular flanges. A drain hole communicates with the draining space and an internal space of the water cooling tank. The shaft is inserted through the two annular flanges. Two gaps, which are formed between the shaft and the two annular flanges, are respectively sealed by the upper shaft seal and the lower shaft seal assembly. Therefore, even if the lower shaft seal assembly fails, the upper shaft seal can still prevent leaking fluid from polluting the work place.

Disclosed is a permanent magnet direct-drive slurry pump based on gas film drag reduction, which includes a permanent magnet motor, a main shaft, an impeller, and a valve block. The permanent magnet motor includes a housing, a stator core, stator windings, a rotor core, and a permanent magnet. The rotor core and the impeller share the main shaft, and an airflow channel is provided inside the main shaft. The impeller includes a front cover plate, a back cover plate, and blades. The blades are modularly manufactured, and blade gas jet holes and hemispherical pits are provided on the pressure surface. The airflow channel in the main shaft is communicated with the blade gas-jet holes. The valve block is disposed at the tail end of the main shaft so as to control gas exhaust and prevent liquid from entering the shaft. The present invention has such advantages as a small size, high efficiency, and strong wear resistance.

An electrical submersible pump assembly has a seal section housing for coupling between a motor and a pump of the assembly. A bladder has an opening sized to slide over an adapter in the seal section housing. A clamp ring is formed of a shape memory alloy selected to create an expanded condition inner diameter when at a room temperature, enabling the clamp ring to be inserted over the bladder opening during assembly. When heated to a selected elevated temperature, the clamp ring contracts and tightly secures the opening around the adapter. The shape memory alloy of the clamp ring also causes the contracted condition inner diameter to expand when chilled to a selected low temperature. Maximum and minimum diameters of the contracted ring are based on an amount of bladder compression that achieves sealing without damage to the bladder.

An electric coolant pump system is presented including a housing having a main body and an end cap. The main body having a hollow interior and an open end. The end cap is operably connected to the main body and closes the open end of the main body. The system includes a rotor shaft operably connected to the housing. The system includes a rotor operably connected to the rotor shaft and positioned within the hollow interior. The system includes an impeller operably connected to the rotor. The system includes a stator configured to generate a rotating electromagnetic field during operation. The rotor is configured to rotate the impeller in response to the rotating electromagnetic field. The impeller is configured to pump a coolant when rotated. One or more components of the electric coolant pump system thermally expand and contract as the coolant is heated and cooled.

A water pump includes a support portion provided with a bearing hole, and a pulley which is provided at one end of a rotation shaft and which is formed in a cylindrical shape with a bottom. The support portion includes an annular small-diameter portion provided with the bearing hole at the center, and an annular large-diameter portion. At least a part of the small-diameter portion is located at the pulley side relative to the large-diameter portion. An annular first clearance is formed between the cylindrical portion of the pulley and the large-diameter portion. A second cylindrical portion is provided on the bottom portion of the pulley. An annular second clearance is formed between the second cylindrical portion and the small-diameter portion.

An electrical submersible pump (ESP) isolates its motor lubricant from pumped product without requiring a bellows, diaphragm, bladder, or external lubricant pressurizing system. A pair of nested isolation chambers below the motor housing are filled with a barrier fluid that is non-reactive, non-miscible, and higher in density than the pumped product and the motor lubricant. As the motor lubricant expands and contracts after pump start-up and shut-down, motor lubricant and barrier fluid are exchanged between the motor housing and the isolation chambers via three interconnections, while pumped product is exchanged with the inner barrier chamber, while being isolated from the motor housing. The interconnections extend between the bottom of the motor housing and the bottom of the outer barrier chamber, between the top of the outer barrier chamber and the bottom of the inner barrier chamber, and between the top of the inner barrier chamber and the pumped product.