A cavitation boiler segment includes a rotor to be coupled with a rotating inner drum and a stator surrounding the rotor segment. The rotor and the stator each include drums with two banks of annular apertures, which overlap to define two cavitation regions. The rotor includes a web bifurcating the rotor between the apertures into an upstream side and a downstream side, each forming a separate fluid passage between a face of the rotor and a bank of apertures. The stator includes a casing enclosing the stator apertures in a fluid passageway. In operation, fluid flows into a first side of the rotor, across a first cavitation region and into the stator, then back across the second cavitation region and into the second side of the rotor where the fluid may flow into a first side of an adjacent segment.

The present invention relates to a motor pump, a pump unit, and a method of balancing an impeller of the motor pump. The motor pump includes an impeller (1), a rotor (2), a stator (3), and a bearing (5). The rotor (2) and the bearing (5) are arranged in a suction side region (Ra) of the impeller (1).

A vertical pump includes: a rotary shaft; multi-stage impellers; a casing accommodating the multi-stage impellers; a mechanical seal provided in a penetration part of the casing for the rotary shaft; a balance sleeve, the balance sleeve being positioned between a final stage impeller of the multi-stage impellers and the mechanical seal in the penetration part for the rotary shaft; an intermediate chamber provided between the rotary shaft and the casing and provided on an opposite side of the multi-stage impellers across the balance sleeve in an axial direction of the rotary shaft, the intermediate chamber communicating with an intermediate stage impeller among the multi-stage impellers; a low pressure chamber provided between the rotary shaft and the casing, the low pressure chamber communicating with a low pressure side compared to the intermediate chamber; and a partition wall part dividing the intermediate chamber and the low pressure chamber.

A pump assembly includes a plurality of pumps. Each of the pumps includes a pump body, a first opening, a second opening, a first connecting member and a second connecting member. The first opening and the second opening are located at a periphery of the pump body. The first connecting member is disposed on the first opening and the second connecting member is disposed on the second opening. The first connecting member of one of the pumps is detachably connected to the second connecting member of another of the pumps, such that each of the pumps can be connected to any of the pumps.

A coaxial pump or turbine module directs working fluid past a rotor and through a flow path symmetrically distributed within an annulus formed between an outer module housing and an inner motor or generator coil housing. The inner housing can be cooled by working fluid in the flow path, or by a cooling fluid flowing between passages of the flow path. The flow path can extend over substantially a full length and rear surface of the inner housing. The rotor can be fixed to a rotating shaft, or rotate about a fixed shaft, which can be threaded into the motor and/or module housing. A plurality of the modules can be combined into a multi-stage apparatus, with rotor speeds independently controlled by corresponding variable frequency drives. The motor or generator can include radial or axial permanent magnets and/or induction coils. Embodiments include guide vanes and/or diffusers.

An integral motor pump module directs at least 90% of its rotor discharge over at least 50% of its motor housing surface, thereby cooling the motor with little or no need for a separate flow path. The discharge can flow through an annulus formed between the motor and pump housings, and can extend over substantially all of the sides and rear of the motor housing. The rotor can be fixed to a rotating shaft, or rotate about a fixed shaft, which can be threaded into the motor and/or module housing. A plurality of the modules can be combined into a multi-stage pump, with rotor speeds independently controlled by corresponding variable frequency drives. The motor can be a radial or axial permanent magnet or induction motor. A separate cooling flow can provide additional cooling e.g. when pumping heated process fluids. Embodiments include guide vanes and/or diffusers.

A centrifugal pump (1) includes at least one pump stage (2) and a first housing part (3) having a suction connection (5). A second housing part (6) has a pressure connection (7). At least one intermediate housing part (10) at least in sections delimits a channel (11) leading to a pressure side of the at least one pump stage (2). The pump further includes a third housing part (20). The second housing part (6) and the at least one intermediate housing part (10) are arranged between the first and the third housing part (3, 20). The at least one intermediate housing part (10) and the second housing part (6) are configured to be arranged in at least two different positions with respect to the first and the third housing (3, 20).

A housing-less wellbore pump assembly is described. The pump assembly includes multiple pump stages connected end-to-end axially to pump well fluid in an uphole direction. Each pump stage includes a rotating impeller to rotate to provide kinetic energy to flow fluid through the wellbore pump assembly and a stationary diffuser within which the rotating impeller is positioned. The stationary diffuser converts the kinetic energy received from the rotating impeller to head to flow the fluid through the wellbore pump assembly. The stationary diffuser includes an uphole threaded end and a downhole threaded end to threadedly couple with another, uphole-positioned pump stage and with another, downhole-positioned pump stage, respectively. Threads of the uphole threaded end and the downhole threaded end are formed in directions opposite to a rotational direction of the impeller.

A centrifugal compressor includes a rotor with a plurality of impellers and a stator with at least a first diaphragm, a second diaphragm, a diffuser, and a plurality of diffuser blades inside the diffuser; each diffuser blade has a tip portion, a base portion and an airfoil portion; and are located between the downstream portion of the first diaphragm and the upstream portion of the second diaphragm; the base portion of the diffuser blades is integrated in or mounted to the upstream portion of the second diaphragm, and the tip portion of the diffuser blades abuts against the downstream portion of the first diaphragm; alternatively, the base portion of the diffuser blades is integrated in or mounted to the downstream portion of the first diaphragm, and the tip portion of the diffuser blades abuts against the upstream portion of the second diaphragm.

A multistage centrifugal pump with a foot part (2) and with a head part (9), between which pump stages are integrated. The head part (9) and the foot part (2) are connected via tie-rods (11) which with one end are fastened on the head part (9) and with the other end are fastened on the foot part (2). The tie-rods (11) at one end comprise a thread (14), with which they are tightened on the head part (9). The tie-rods (11) are formed from sheet metal and at the other end comprise a recess (16), with which recess they are positively fixed on the foot part (2), at least one the tensile direction 22