An apparatus and system for sealing an electrical submersible pump (ESP) assembly are described. An ESP system includes a top portion of a seal section including a sand barrier portion defined by a sand barrier stop secured between the ESP intake and an adapter portion, the sand barrier portion including a sand barrier wedged between the sand barrier stop and the adapter portion, the adapter portion encasing a mechanical seal and secured between the sand barrier portion and a head portion, the head portion secured between the adapter portion and a seal section housing, the head portion including a thrust bearing and a thrust runner, wherein each of the thrust bearing and the thrust runner includes at least one pad having a diamond-like carbon (DLC) layer on an outer surface.

Methods and modules for protecting pumps are provided, the modules having a sensor for detecting leaks of the pump seal, a sensor for detecting rain and/or a sensor for detecting that the pump is running dry and thus is overheated. Each sensor communicates with a circuitry configured to shut down the pump until the problem is resolved and to send a notice or alarm to a person or a system. A reset button may be provided to override the shutdown of the pump by the circuitry. Methods of using the modules are also provided.

An electrical submersible pump for use in an electrical submersible pumping (ESP) system includes one or more pump stages, a thrust chamber having a thrust bearing for countering a thrust force generated by the one or more pump stages, and a unitary housing which encloses the pump stages and the thrust chamber so that the thrust mechanism and the pump stages are housed together.

A pump assembly includes an electrical drive motor (2) and an impeller which is connected to the drive motor (2) via a shaft (14). The shaft extends between the drive motor (2) and the impeller, through a seal arrangement with a fluid reservoir (22). A method is provided for detecting a concentration change in a fluid reservoir in the seal arrangement in the pump assembly. A concentration sensor (30) detects a concentration change in the fluid reservoir (22), and a second sensor (32) detects at least one further parameter of the fluid reservoir (22). The sensors are arranged on the fluid reservoir (22). The sensors are connected to an evaluation device (22). The evaluation device (34) is configured to carry out an evaluation of at least one reading of the concentration sensor (30), taking into account at least one reading which is detected by the second sensor (32).

A pump is provided with a pump housing defining a volute chamber positioned between a central inlet and an impeller face, with the housing defining a recess intersecting the face and surrounding an aperture, and the housing defining sequentially first and second ramps, a wall section, and a protrusion extending into the recess. An impeller is positioned within the chamber adjacent to the face, with the impeller connected to a drive shaft extending through the aperture. A method is provided for cooling a drive shaft sealing member by controlling fluid flow through the pump.

There is provided a centrifugal pump comprising a pumping chamber (106). The pumping chamber (106) has an inner surface (108) defining a pump cavity (110); a pump inlet (112) defined in a first side of the pumping chamber (106); a shaft opening (116) defined substantially centrally in a second side of the pumping chamber (106), the second side substantially opposing the first side and arranged to be above the first side, in use; and a pump outlet (114). The centrifugal pump further comprises an impeller (120) retained within the pump cavity (110); and a shaft member (140) mechanically connected to the impeller (120) through the shaft opening (116), whereby rotation of the shaft member (140) causes rotation of the impeller (120) about a shaft axis (157) passing through the shaft opening (116) and movement of a pumping liquid from the pump inlet (112) towards the pump outlet (114). The centrifugal pump further comprises a flow modifier (150) provided adjacent to an outer surface (107) of the pumping chamber (106) at the shaft opening (116) to substantially prevent ingress of air into the pump cavity (110) through the shaft opening (116) during operation of the pump even when a water level in a liquid tank (104) surrounding the pumping chamber (106) drops below a level of the shaft opening (116). The flow modifier (150) comprises an annular portion (152) having defined therein a further shaft opening (156) spaced from the shaft opening (116) and having the shaft member (140) passing therethrough. The centrifugal pump comprises a spacing member (154) spacing the annular portion (152) from the outer surface (107). The flow modifier (150) defines a liquid overflow outlet (164) for liquid flow from the shaft opening (116) in a direction substantially transverse to the shaft axis (157). In one example, the liquid overflow outlet (164) is sized to substantially prevent the ingress of air into the pump cavity (110) through the shaft opening (116) during operation of the pump, even when the water level in the liquid tank (104) surrounding the pumping chamber (106) drops below the level of the shaft opening (116). In the same or an alternative example, the annular portion (152) comprises a first portion (158) having defined therein the further shaft opening (156) and a second portion (160) extending towards the outer

The fluid pump according to the present invention has water storage means that is formed so as to communicate with a shaft hole in a pump case and stores fluid leaking from a mechanical seal. An electromagnetic clutch establishes or blocks the transmission of power to a drive shaft by switching between supply and non-supply of electricity to an excitation coil. The water storage means has a weep chamber that communicates with the shaft hole between the mechanical seal and a bearing and is opened to an end portion in the axial direction. An attachment member for attaching a core of the electromagnetic clutch to the pump case seals the opening of the weep chamber.

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.

Modules for protecting pumps are provided having a sensor detecting leaks of the pump seal, a sensor detecting rain and/or a sensor detecting that the pump is running dry and thus is overheated. Each sensor communicates with a circuitry configured to shut down the pump until the problem is resolved and to send a notice or alarm to a person or a system. A reset button may be provided to override the shutdown of the pump by the circuitry. Methods of using the modules are also provided.

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.