Driving arrangement for a pump or compressor

A driving arrangement for a pump, compressor or similar, that provides alternating pressure in at least two chambers, such as chambers of the pump or the compressor, as a result of a reciprocating movement of a bar element, the bar element at its respective ends is connected to a movable pressure chamber face, the movable pressure chamber face is a piston or plunger, the bar element is reciprocally supported in a housing and wherein the driving arrangement further comprises an electric motor that provides the reciprocating movement of the bar element;

• wherein the electric motor is an electric permanent magnet rotary motor;
• wherein the bar element extends through the rotor of the electric motor and a rotational to linear transformation means is functionally connected between the bar element and the rotor of the motor in such way that rotation of the rotor results in linear movement of the bar element;
• wherein a linear guide is functionally connected between the bar element and the housing in such way as to prevent rotation of the bar element with respect to the housing;
• wherein the driving arrangement further comprises a release mechanism having a first clutch part connected to the linear guide and a second clutch part connected to the housing;
• and
• wherein at excessive rotational force between the first and second clutch parts the rotational connection between the first and second clutch parts will slip letting the piston rod rotate along with the rotor of the motor and halting its linear movement.

A driving arrangement for a pump, compressor or similar, that provides alternating pressure in at least two chambers, such as chambers of the pump or the compressor, as a result of a reciprocating movement of a bar element, the bar element at its respective ends is connected to a piston or plunger being a movable pressure chamber face of a first and second function chambers, the bar element is reciprocally supported in a housing, and wherein the driving arrangement further comprises an electric motor which is adapted to provide the reciprocating movement of the bar element;

• wherein the electric motor is an electric permanent magnet rotary motor;
• wherein the bar element extends through the rotor of the electric motor and a rotational to linear transformation means is functionally connected between the bar element and the rotor of the motor in such way that rotation of the rotor results in linear movement of the bar element;
• wherein a linear guide is functionally connected between the bar element and the housing as to prevent rotation of the bar element with respect to the housing;
• and
• wherein the driving arrangement further comprises a closable fluid connection between the first function chamber and the second function chamber.

A pump assembly comprising:

• two driving arrangements, wherein each driving arrangement is separately connected to two pumps or compressors;
• wherein each of the two driving arrangements provides alternating pressure in chambers of said separately connected two pumps or compressors as result of a reciprocating movement of a respective bar element in each driving arrangement;
• wherein the bar elements are reciprocally supported in a housing of the two driving arrangements and wherein each driving arrangement further comprises an electric motor that provides the reciprocating movement of the bar element;
• wherein the electric motor is an electric permanent magnet rotary motor;
• wherein the bar elements extend through the rotor of the respective electric motor and a rotational to linear transformation means is functionally connected between the bar element and the rotor of the motor in such way that rotation of the rotor results in linear movement of the bar element;
• wherein the bar elements are each connected to a pair of pistons or plungers, which pistons or plungers provide said alternating pressure;
• and
• wherein the two pumps or compressors are of a type adapted for pumping or compressing a fluid when driven by said alternating pressure.

A driving arrangement for a pump, compressor or similar, that provides alternating pressure in at least two chambers, such as chambers of a pump or compressor, as a result of a reciprocating movement of a bar element, wherein bar element at its respective ends is connected to a movable pressure chamber face being pistons, wherein the bar element is reciprocally supported in a housing, and wherein the driving arrangement further comprises an electric motor that provides the reciprocating movement of the bar element;

• wherein the electric motor is an electric rotary motor;
• wherein the bar element extends through the rotor of the electric motor and that a rotational to linear transformation means is functionally connected between the bar element and the rotor of the motor, in such way that rotation of the rotor results in linear movement of the bar element;
• wherein the rotor of the electric motor and the rotational to linear transformation means are arranged in a fluid chamber which is confined by at least said housing and said pistons and that the fluid chamber is filled with a liquid;
• and
• wherein liquid is flowed past the rotor of the motor when the bar element reciprocates.

A pump assembly having a first and a second pump driving arrangement of which the first is functionally connected to a first pair of pumps and the second is functionally connected to a second pair of pumps, wherein:

• the first and second pump driving arrangement each comprises a housing within which a bar element with a piston arranged at each of its ends is arranged and reciprocates, each of the pistons being functionally connected to a first and second function chamber, respectively, so that a reciprocating movement of the bar element results in pressure alteration in said first and second function chambers;
• the first and second pump driving arrangement comprises an electrical permanent magnet rotary motor, wherein the bar member extends through a rotor of the magnet rotary motor;
• a rotational to linear transformation means is functionally connected between the bar element and the rotor of the magnet rotary motor in such way that rotation of the rotor results in linear movement of the bar element;
• a linear guide is functionally connected between the bar element and the housing in such way as to prevent rotation of the bar element with respect to the housing;
• wherein the pump assembly further comprises said first and second pair of pumps, of which each of the four pumps comprises:
• a pump chamber which is functionally connected to one of the two function chambers of the pump driving arrangement to which the pump is connected;
• a one way intake valve that opens for fluid inflow to the pump chamber at a negative pressure in the pump chamber;
• and
• a one way outlet valve that opens for fluid outflow of the pump chamber at a positive pressure in the pump chamber.