A pump e.g. a screw pump, includes a main pumping element and a generally parallel auxiliary pumping element, and a pump housing, the main and auxiliary pumping elements interacting with each other and with an internal wall of an elongate pumping chamber of the housing as they relatively rotate to pump fluid from a first axial inlet end of the elongate chamber towards a second axial outlet end of the elongate chamber, and wherein the internal wall of the elongate pumping chamber includes at leas...

A conduit elbow having first opening and a second opening and housing a pump assembly for use in an air conditioning system, the pump assembly including a pump having a pump inlet and a pump outlet, and wherein the pump inlet is a fluid communication with a reservoir. The reservoir is formed integrally with the pump assembly and has an inlet fluid communication with a first fluid-carrying pipe of an air-conditioning installation and wherein the pump outlet of an air fluid communication with a se...

A pump system is provided where low pressure (4) and high pressure (6) pumps are coaxially mounted to receive motive power from a shared drive (300). The drive shafts are arranged such that one extends within a void in the other and both have shear regions such that, in the event of torque overload, either shaft can shear so as to disconnect the drive to it's associated pump while the other pump and shaft can continue to work.

A turbo-molecular pump has stator discs 2 separated from one another by spacer rings 3 constructed in such a manner that gases streaming back can re-enter the suction space 8 through reduced portions 5 at the outer diameter and through radial recesses 6. Inner reduced portions 7 serve for the additional location of the stator discs 2.

A fluid pump (10) has a body housing (14) a fluid pumping chamber having a rotatable pumping member (16), a drive shaft (12) which passes through an aperture in the body into the pumping chamber to effect rotation of the pumping member in use, a seal (18) between the pump body and drive shaft to inhibit fluid moving along the shaft out of the pumping chamber, and a dividing shroud (32) operably located between the seal and the rotatable pumping member to divide the fluid pumping chamber (30) bet...

A regenerative pump comprises a housing (1), an impeller (5) within the housing (1) having a plurality of vanes (13) spaced angularly around the axis of rotation of the impeller (5) and accommodated within a flow channel (4) within the housing (1) extending between an inlet (19) and an outlet (20), a flow stripper (17) located between the inlet (19) and outlet (20) and through which the vanes (13) pass, a fluid flow loop (27) in the stripper (17) which intersects the path of rotation of the vane...

The invention provides a pump adapted inter alia for the intake and delivery of liquid such as water in wells or relatively deep bodies of water. The pump comprises a rigid-walled chamber, adapted to be immersed in the liquid to be sucked in. The rigid-walled chamber has an intake valve and a delivery valve interposed between the rigid-walled chamber and a delivery tube. The pump is characterized in that it comprises, accommodated in the rigid-walled chamber, a resiliently deformable chamber ass...

A pump suitable for food products containing solid pieces has a rotary turret (11) incorporating four piston and cylinder pumping units (15) spaced uniformly around the rotation axis. The pistons are reciprocated by a stationary cam (8) and have associated with them rolling diaphragms (35) which separate pumping chamber (40) from chamber (41) which are connected to a vacuum source. The cylinders are closed by a rotor end member (50) journalled on a manifold member (60) and provided with fluid po...

A screw displacement pump (10) for comingled material has a body (11) defining a chamber (12'). Inlets are provided for the admission of fluid to the chamber and an outlet is provided for discharge of fluid from the chamber (12') intermeshing screw members (40) are mounted for rotation within the chamber (12') for transporting comingled material from the inlet to the outlet, the threads (41,42) of the intermeshing screw members (40) being of opposite hand. The pitch of the screws (40) at the out...

In a blood pump a fluid pressure circuit is provided which is operative to feed a variable frequency pulsating flow of water to one side of a flexible diaphragm. The other side of the flexible diaphragm is connected into a patient's bloodstream and thus flexure of the diaphragm results in a pulsatile flow of blood on said other side of the diaphragm. The specification describes a number of devices for alternately applying suction and pressure to the water in said fluid pressure circuit and there...