A blocking device for a pump having a rotor that is rotatable about a rotation axis in a pump duct and comprises a rotor hub and a rotor collar that extends from the rotor hub in the radial direction and encircles it in an undulating manner, wherein the blocking device comprises a plurality of blocking elements which are configured to block the pump duct in the axial direction on both sides of the rotor collar, wherein each of the plurality of blocking elements has a slot with a U-shaped sealing profile for abutting against the rotor collar, a sealing face for abutting against the rotor hub, and two contacting faces for abutting against a seat of the pump duct and/or against a contacting face of another blocking element of the plurality of blocking elements, and to a pump having a corresponding blocking device.

A pump includes a rotor and a pump housing. The rotor is rotatable about a rotation axis and comprises a rotor hub and a rotor collar. The rotor collar extends from the rotor hub in the radial direction and encircles the rotor hub in an undulating manner. The pump housing comprises a first axial housing component, a central annular housing component, and a second axial housing component. A pump duct is formed (i) in the axial direction by the first and second housing components and (ii) in the radial direction by the central annular housing component and the rotor.

A pump includes a rotor, a pump housing, and a blocking device. The rotor is rotatable about a rotation axis and comprises a rotor hub and a rotor collar that extends from the rotor hub in a radial direction and encircles the rotor hub in an undulating manner. The pump housing forms a pump duct with the rotor. The pump duct connects a first inlet/outlet space to a second inlet/outlet space. The blocking device is arranged between the first and second inlet/outlet spaces and comprises a blocking element that blocks the pump duct in an axial direction on both sides of the rotor collar. The blocking device has first and second seats for the blocking element. A spacing between the first and second seats in a circumferential direction is greater than the spacing between first and second contacting faces of the blocking element in the circumferential direction.

The present disclosure relates to a variable displacement vane pump, in particular for oil, comprising a body having a cavity wherein a movable ring slides in the longitudinal direction over the rotor which rotates around an axis and which is provided with vanes which are radially supported on the inner surface of the fixed ring of fixed eccentricity relative to the rotation axis of the rotor, and with movement means in the longitudinal direction of the movable ring according to a pilot pressure between a position corresponding to the maximum volume of the plurality of chambers, the return elastic spring being in this position at its maximum length, and a predetermined end position corresponding to the minimum volume of the plurality of chambers, the return elastic spring being in this position at its minimum length by action of the displacement in the longitudinal direction of the movable wall which occurs simultaneously to the longitudinal displacement of the plurality of vanes and of the movable ring.

A pump having a rotor that is rotatable about a rotation axis and comprises a rotor hub and a rotor collar that extends from the rotor hub in the radial direction and encircles it in an undulating manner, and a pump housing which comprises a first axial housing component, a central annular housing component and a second axial housing component, wherein a pump duct is formed in the axial direction by the first and second housing components and in the radial direction by the central annular housing component and the rotor, and also a pump in which the annular pump duct has a constant cross section and connects a first radially external inlet/outlet space to a second radially external inlet/outlet space, and the pump may include a blocking device which is arranged between the first radially external inlet/outlet space and the second radially external inlet/outlet space and which comprises a blocking element which blocks the pump duct in the axial direction on both sides of the rotor collar.

A pump having a rotor that is rotatable about a rotation axis and comprises a rotor hub and a rotor collar that extends from the rotor hub in the radial direction and encircles it in an undulating manner, a pump housing which forms a pump duct with the rotor, said pump duct connecting a first inlet/outlet space to a second inlet/outlet space and a blocking device which is arranged between the first inlet/outlet space and the second inlet/outlet space and which comprises a blocking element which blocks the pump duct in the axial direction on both sides of the rotor collar. The blocking device has a first seat and a second seat for the blocking element, wherein the spacing between the first seat and the second seat in the circumferential direction is greater than the spacing between a first contacting face and a second contacting face of the blocking element in the circumferential direction. The invention also relates to a pump having a blocking device which includes a chamber formed in the pump housing, wherein the chamber and the blocking element are configured such that an exchange duct is formed in the axial direction between an axially front fluid chamber and an axially rear fluid chamber on the opposite side of the rotor collar, and to a corresponding blocking element.

A blocking device for a pump having a rotor that is rotatable about a rotation axis in a pump duct and comprises a rotor hub and a rotor collar that extends from the rotor hub in the radial direction and encircles it in an undulating manner, wherein the blocking device comprises a plurality of blocking elements which are configured to block the pump duct in the axial direction on both sides of the rotor collar, wherein each of the plurality of blocking elements has a slot with a U-shaped sealing profile for abutting against the rotor collar, a sealing face for abutting against the rotor hub, and two contacting faces for abutting against a seat of the pump duct and/or against a contacting face of another blocking element of the plurality of blocking elements, and to a pump having a corresponding blocking device.

An apparatus for driving fluid includes a housing having an interior chamber in communication with a fluid inlet for receiving the fluid and a fluid outlet for expelling the fluid, a cam rotatably mounted within the interior chamber, the cam configured to drive fluid to flow, the cam having an annular channel formed therein, a working vane extending into the annular channel for sliding therein as the cam rotates, wherein the working vane divides the annular channel into an inlet chamber and an outlet chamber such that, as the cam rotates, the inlet chamber expands and the outlet chamber contracts, a follower vane extending into the annular channel for sliding therein as the cam rotates, wherein the follower vane allows fluid to pass in the annular channel, and a rocker arm for providing dependent motion between the working vane and the follower vane.

An apparatus for compressing or pumping fluid includes a housing having an interior chamber. A rotating cam is rotatably mounted within an interior chamber and includes a reversible cam body configured to enable fluid to flow in a foreword direction and a reverse direction. The reversible cam body has a first sloped annular channel formed therein. The first end of the reversible cam body includes a ramp up portion, a ramp down portion, and inner and outer circumferential sidewalls that circumscribe the ramp to define the first sloped annular channel. The apparatus may include a circumferential cam gear located on the outer circumferential sidewall and a secondary drive shaft with a pinion gear to rotate the circumferential cam gear.

An apparatus for driving fluid includes a housing having an interior chamber in communication with a fluid inlet for receiving the fluid and a fluid outlet for expelling the fluid, a cam rotatably mounted within the interior chamber, the cam configured to drive fluid to flow, the cam having an annular channel formed therein, a working vane extending into the annular channel for sliding therein as the cam rotates, wherein the working vane divides the annular channel into an inlet chamber and an outlet chamber such that, as the cam rotates, the inlet chamber expands and the outlet chamber contracts, a follower vane extending into the annular channel for sliding therein as the cam rotates, wherein the follower vane allows fluid to pass in he annular channel, and a rocker arm for providing dependent motion between the working vane and the follower vane.