An electric submersible pump (ESP) assembly. The ESP assembly comprises an electric motor, a centrifugal pump, and a hybrid magnetic radial bearing, wherein the hybrid magnetic radial bearing is disposed inside the electric motor or disposed inside the centrifugal pump.

A pump out system removes a liquid from a worksite and includes a pump, a power source, a rigid spacer, a coupling, and a flexible discharge hose. The pump moves the liquid from an intake of the pump to an output of the pump in response to receiving power. The power source selectively connects to the pump to provide power to the pump. The rigid spacer connects the power source to the pump and spaces the power source from the submersible pump. The coupling sealingly secures the rigid spacer to the pump and prevents ingress of the liquid into the rigid spacer and a cavity defined by the coupling and the pump. The flexible discharge hose connects to the output of the pump and communicates the liquid from the output of the pump away from the worksite.

A pump out system removes a liquid from a worksite and includes a pump, a power source, a rigid spacer, a coupling, and a flexible discharge hose. The pump moves the liquid from an intake of the pump to an output of the pump in response to receiving power. The power source selectively connects to the pump to provide power to the pump. The rigid spacer connects the power source to the pump and spaces the power source from the submersible pump. The coupling sealingly secures the rigid spacer to the pump and prevents ingress of the liquid into the rigid spacer and a cavity defined by the coupling and the pump. The flexible discharge hose connects to the output of the pump and communicates the liquid from the output of the pump away from the worksite.

A liquid pump includes a pump house with an electric motor housed therein, a pump cover connected to the pump house, an impeller housed in the pump cover and driven by the motor, and a sleeve disposed between the pump cover and the pump house. Two of the pump cover, the pump house, and the sleeve are respectively provided with an outer binding segment and an inner binding segment, the outer binding segment is made of polyphenylene sulfide mixed with glass fiber, and permeable to a laser light, the inner binding segment is cable of absorbing the laser light.

A liquid pump includes a pump house with an electric motor housed therein, a pump cover connected to the pump house, an impeller housed in the pump cover and driven by the motor, and a sleeve disposed between the pump cover and the pump house. Two of the pump cover, the pump house, and the sleeve are respectively provided with an outer binding segment and an inner binding segment, the outer binding segment is made of polyphenylene sulfide mixed with glass fiber, and permeable to a laser light, the inner binding segment is cable of absorbing the laser light.

A plug-in electronic expansion module for pump electronics of a centrifugal pump for expanding the pump electronics with at least one additional function has a housing having a lower face and connecting formations thereon for attachment to a pump housing of the pump electronics. Electronics in the module housing provide the additional function. A base is provided on the lower face, and an electrical interface connected to the pump electronics includes a flat support projecting tongue-like from the base on the lower face of the module housing through an opening in the pump housing and carrying contact-forming electrical traces.

A plug-in electronic expansion module for pump electronics of a centrifugal pump for expanding the pump electronics with at least one additional function has a housing having a lower face and connecting formations thereon for attachment to a pump housing of the pump electronics. Electronics in the module housing provide the additional function. A base is provided on the lower face, and an electrical interface connected to the pump electronics includes a flat support projecting tongue-like from the base on the lower face of the module housing through an opening in the pump housing and carrying contact-forming electrical traces.

Embodiments of the present disclosure provide a flow control valve, an oil pump assembly having the flow control valve, and a scroll compressor. The flow control valve includes: a valve body having an inlet configured for a fluid to flow into the valve body and an outlet configured for the fluid to flow out of the valve body; a passage provided between the inlet and the outlet and extending in a predetermined direction, an area of a cross section of the passage perpendicular to the predetermined direction being negatively correlated with a distance from the cross section to the inlet; a valve element slidably provided in the passage, a flow area between the valve element and an inner wall of the passage is negatively correlated with the distance from the valve element to the inlet; and an elastic member provided in the valve body to apply an elastic force on the valve element so as to move the valve element in a direction toward the inlet. Thereby, for example, lubrication of the scroll compressor is improved.

Embodiments of the present disclosure provide a flow control valve, an oil pump assembly having the flow control valve, and a scroll compressor. The flow control valve includes: a valve body having an inlet configured for a fluid to flow into the valve body and an outlet configured for the fluid to flow out of the valve body; a passage provided between the inlet and the outlet and extending in a predetermined direction, an area of a cross section of the passage perpendicular to the predetermined direction being negatively correlated with a distance from the cross section to the inlet; a valve element slidably provided in the passage, a flow area between the valve element and an inner wall of the passage is negatively correlated with the distance from the valve element to the inlet; and an elastic member provided in the valve body to apply an elastic force on the valve element so as to move the valve element in a direction toward the inlet. Thereby, for example, lubrication of the scroll compressor is improved.

Provided in one example is a centrifugal pump. The centrifugal pump, according to this example, includes a shaft having an axial keyway located therein, as well as an axial key positioned within the axial keyway, the axial key having a recess located in a radial exterior surface thereof. The centrifugal pump according to this example additionally includes an impeller positioned on the shaft about the axial key, and a retaining ring positioned on the shaft about the axial key, a portion of the retaining ring extending into the recess for axially fixing the retaining ring relative to the axial key. The centrifugal pump according to this example further includes one or more fasteners attaching the retaining ring to the impeller, and a diffuser coupled about the shaft and proximate the impeller.