Linear positive displacement pump with rotary to reciprocating drive

Claim 2

An improved reciprocating pump for increasing the energy of a fluid comprising: a. a bank having at least one piston and cylinder, the piston being translationally received in the cylinder; b. fluid inlet means to the cylinder for the admission of a fluid thereinto; c. fluid outlet means from the cylinder for discharging fluid therefrom; d. a drive for reciprocating the piston within the cylinder and increasing thereby the energy of the fluid, the drive comprising a first and a second pair of nuts and screws with the nut of each pair being threadably received on its associated screw, the second pair being threaded opposite to the first, of each nut and screw pair one being a drive member and one being a driven member; e. low friction means between the threads of each nut and the threads of its associated screw for reducing friction losses; f. means for driving the drive members in rotation; g. means for preventing linear translation of each of the drive members with respect to its driven member; h. means for alternately producing rotation of each of the drive members with respect to its driven member to produce linear motion of its driven member; i. means for coupling the driven members together for reciprocation togEther; and j. means for coupling the driven members to the piston for reciprocation of the piston with the driven members.

Claim 3

The improved reciprocating pump for increasing the energy of a fluid claimed in claim 1 wherein in each nut and screw pair the nut is the drive member and the screw is the driven member.

Claim 4

The improved reciprocating pump for increasing the energy of a fluid claimed in claim 2 wherein the low friction means for each nut and screw pair includes recirculating balls in the threads between each nut and screw.

Claim 5

An improved reciprocating pump for increasing the energy of a fluid comprising: a. a first bank having at least one piston and one cylinder, the piston being translationally received in the cylinder, fluid inlet means to the cylinder for the admission of a fluid thereinto, and fluid outlet means from the cylinder for discharging fluid therefrom; b. a second bank having at least one piston and cylinder, the piston being translationally received in the cylinder, fluid inlet means to the cylinder for the admission of a fluid thereinto, fluid outlet means from the cylinder for discharging fluid therefrom; c. a first screw and a first nut, the first nut being threadably received by the first screw; d. low friction means between the threads of the first nut and the threads of the first screw; e. a second screw and a second nut, the second nut being threadably received in the second screw and the second nut being oppositely threaded from the first screw and the first nut; f. low friction means between the threads of the second nut and the threads of the second screw; g. means coupling the first and the second screws together for linear movement together; h. means coupling the first screw to the first piston for linear movement together; i. means coupling the second screw to the second piston for linear movement together; j. means to effect relative rotation between the first nut and the first screw to produce linear movement of the first screw with respect to the first nut in a first linear direction along the axis of the first screw; k. means to effect relative rotation between the second nut and the second screw to produce linear movement of the second screw with respect to the second nut in a second linear direction along the axis of the second screw opposite the first direction; l. means for alternately effecting the relative rotations between the first nut and the screw and the second nut and the screw to produce reciprocation of the first and second screws and thereby reciprocation of the first and second pistons; and m. means to rotate the nuts and screws.

Claim 6

An improved reciprocating pump for increasing the energy of a fluid comprising: a. a first bank having at least one piston and one cylinder, the piston being translationally received in the cylinder, fluid inlet means to the cylinder for the admission of a fluid thereinto, and fluid outlet means from the cylinder for discharging fluid therefrom; b. a second bank having at least one piston and cylinder, the piston being translationally received in the cylinder, fluid inlet means to the cylinder for the admission of a fluid thereinto, fluid outlet means from the cylinder for discharging fluid therefrom; c. a first screw and a first nut, the first nut being threadably received by the first screw; d. low friction means between the threads of the first nut and the threads of the first screw; e. a second screw and a second nut, the second nut being threadably received in the second screw and the second nut being oppositely threaded from the first screw and the first nut; f. low friction means between the threads of the second nut and the threads of the second screw; g. means coupling the first and the second screws together for linear movement together; h. means coupling the first screw to the first piston for linear movement together; i. means coupling the second screw to the second piston for linear movement together; j. means to effect relative rotation between the first nut and the first screw to produce linear movement of the first screw with respect to the first nut in a first linear direction along the axis of the first screw; k. means to effect relative rotation between the second nut and the second screw to produce linear movement of the second screw with respect to the second nut in a second linear direction along the axis of the second screw opposite the first direction; l. means for alternately effecting the relative rotations between the first nut and the screw and the second nut and the screw to produce reciprocation of the first and second screws and thereby reciprocation of the first and second pistons; and m. means to rotate the nuts and screws.

Claim 7

The improved reciprocating pump for increasing the energy of a fluid claimed in claim 4 wherein the means to rotate the nuts is capable of rotating the nuts in one direction at a constant speed.

Claim 8

The improved reciprocating pump for increasing the energy of a fluid claimed in claim 5 wherein the low friction means for the first and the second nuts and screws comprises recirculating balls in the threads between each nut and screw.

Claim 9

The improved reciprocating pump for increasing the energy of a fluid claimed in claim 6 wherein the inlet and outlet means to the cylinders comprise inlet and outlet check valves for each cylinder, the check valves having a valving element which is normally closed but responding respectively to a predetermined inlet pressure and a predetermined outlet pressure.

Claim 10

The improved reciprocating pump for increasing the energy of a fluid claimed in claim 7 including means for varying the limits between the extremes of reciprocation of each of the pistons.

Claim 11

An improved reciprocating pump for increasing the energy of a fluid comprising: a. a first bank having a plurality of stages with each stage having a piston and a cylinder, the piston of each stage being translationally received in its associated cylinder, fluid inlet means to each of the cylinders for admissioN of a fluid thereinto at a predetermined inlet pressure, and fluid outlet means from each of the cylinders for discharging fluid therefrom at a predetermined outlet pressure; b. a second bank having a plurality of stages corresponding in number to the number of stages of the first bank with each stage of the second bank having a piston and a cylinder, the piston of each stage being translationally received in its associated cylinder, fluid inlet means to each of the cylinders for the admission of a fluid thereinto at a predetermined inlet pressure, and fluid outlet means from each of the cylinders for discharging fluid therefrom at a predetermined outlet pressure; c. a first nut and a first screw, with the first nut being threadably received in the first screw, and low friction means between the threads of the first nut and the threads of the first screw; d. a second screw and a second nut, the second nut being threadably received in the second screw and the second screw and the second nut being oppositely threaded from the first screw and the first nut, and low friction means between the threads of the second nut and the threads of the second screw; e. means coupling the first and the second screws together for linear movement together; f. means coupling the first and second screws to the pistons of the first and second banks for linear movement together; g. means to effect relative rotation between the first nut and the first screw to produce linear movement of the first screw with respect to the first nut in the first linear direction along the axis of the first screw; h. means to effect relative rotation between the second nut and the second screw to produce linear movement of the second screw with respect to the second nut in a second linear direction along the axis of the second screw opposite the first direction; i. means for alternately effecting the relative rotation between the first nut and screw and the second nut and screw to produce reciprocation of the first and second screws; and j. means to rotate the nuts and screws.

Claim 12

An improved reciprocating pump for increasing the energy of a fluid comprising: a. a first bank having a plurality of stages with each stage having a piston and a cylinder, the piston of each stage being translationally received in its associated cylinder, fluid inlet means to each of the cylinders for admissioN of a fluid thereinto at a predetermined inlet pressure, and fluid outlet means from each of the cylinders for discharging fluid therefrom at a predetermined outlet pressure; b. a second bank having a plurality of stages corresponding in number to the number of stages of the first bank with each stage of the second bank having a piston and a cylinder, the piston of each stage being translationally received in its associated cylinder, fluid inlet means to each of the cylinders for the admission of a fluid thereinto at a predetermined inlet pressure, and fluid outlet means from each of the cylinders for discharging fluid therefrom at a predetermined outlet pressure; c. a first nut and a first screw, with the first nut being threadably received in the first screw, and low friction means between the threads of the first nut and the threads of the first screw; d. a second screw and a second nut, the second nut being threadably received in the second screw and the second screw and the second nut being oppositely threaded from the first screw and the first nut, and low friction means between the threads of the second nut and the threads of the second screw; e. means coupling the first and the second screws together for linear movement together; f. means coupling the first and second screws to the pistons of the first and second banks for linear movement together; g. means to effect relative rotation between the first nut and the first screw to produce linear movement of the first screw with respect to the first nut in the first linear direction along the axis of the first screw; h. means to effect relative rotation between the second nut and the second screw to produce linear movement of the second screw with respect to the second nut in a second linear direction along the axis of the second screw opposite the first direction; i. means for alternately effecting the relative rotation between the first nut and screw and the second nut and screw to produce reciprocation of the first and second screws; and j. means to rotate the nuts and screws.

Claim 13

The improved reciprocating pump for increasing the energy of a fluid claimed in claim 9 wherein the means for coupling the pistons of each bank to the screws includes a first and a second pilot plate secured respectively to the first and second screws and to the pistons of the first and second banks.

Claim 14

The improved reciprocating pump for increasing the energy of a fluid claimed in claim 9 wherein the stages in each bank increase progressively from a low pressure stage to a high pressure stage, and wherein the outlet of each stage except for the high pressure stage is the inlet to the next higher pressure stage in the opposite bank.

Claim 15

The improved reciprocating pump for increasing the energy of a fluid claimed in claim 9 wherein the stages in each bank progress from a low pressure stage to a high pressure stage and means is provided for connecting the outlet means of a lower stage cylinder to the inlet means of the next higher stage cylinder in the opposite bank.

Claim 16

The improved reciprocating pump for increasing the energy of a fluid claimed in claim 9 wherein means is provided to vary the length of reciprocation.

Claim 17

The improved reciprocating pump for increasing the energy of a fluid claimed in claim 9 including Teflon seals between each of the pistons and its cylinder to prevent fluid from passing along the interface between the two.

Claim 18

The improved reciprocating pump claimed in claim 9 wherein means is provided for each bank for enclosing the cylinders to define a closed space common to all the cylinders in the bank.

Claim 19

An improved reciprocating pump for increasing the energy of a fluid comprising: a. a base; b. first and second parallel medial plates secured to the base; c. first and second parallel lateral plates secured to the base with the medial plates between them; d. a central axis passing through each of the plates; e. a first and a second plurality of piston and cylinder combinations mounted periaxially to the central axis between the first medial and first lateral plates and the second medial and second lateral plates, respectively, the first plurality equaling the second plurality, each piston and cylinder in the first plurality having a corresponding piston and cylinder in the second plurality, fluid inlet means into each cylinder for admitting fluid thereinto at a predetermined inlet pressure for the cylinder, and fluid outlet means for each cylinder for discharging fluid therefrom at a predetermined outlet pressure for the cylinder; f. first and second oppositely threaded screws translationally disposed coaxially with the central axis in the first medial and first lateral plates and the second medial and second lateral plates, respectively; g. first and second nuts received on the threads of the first and second screws, respectively, and rotatably mounted between the medial plates against translation; h. first and second low friction means between the threads of the first nut and screw and the threads of the second nut and screw, respectively; i. first and second pilot plates secured to the first and second screws, respectively, outwardly of the lateral plates; j. means securing the pilot plates together for translation together; k. first and second brake means for selectively preventing rotation of the first and second screws, respectively, with respect to their associated nuts; l. means for rotating the nuts; and m. means for alternately activating the brake means to reciprocate the pistons.

Claim 20

An improved reciprocating pump for increasing the energy of a fluid comprising: a. a base; b. first and second parallel medial plates secured to the base; c. first and second parallel lateral plates secured to the base with the medial plates between them; d. a central axis passing through each of the plates; e. a first and a second plurality of piston and cylinder combinations mounted periaxially to the central axis between the first medial and first lateral plates and the second medial and second lateral plates, respectively, the first plurality equaling the second plurality, each piston and cylinder in the first plurality having a corresponding piston and cylinder in the second plurality, fluid inlet means into each cylinder for admitting fluid thereinto at a predetermined inlet pressure for the cylinder, and fluid outlet means for each cylinder for discharging fluid therefrom at a predetermined outlet pressure for the cylinder; f. first and second oppositely threaded screws translationally disposed coaxially with the central axis in the first medial and first lateral plates and the second medial and second lateral plates, respectively; g. first and second nuts received on the threads of the first and second screws, respectively, and rotatably mounted between the medial plates against translation; h. first and second low friction means between the threads of the first nut and screw and the threads of the second nut and screw, respectively; i. first and second pilot plates secured to the first and second screws, respectively, outwardly of the lateral plates; j. means securing the pilot plates together for translation together; k. first and second brake means for selectively preventing rotation of the first and second screws, respectively, with respect to their associated nuts; l. means for rotating the nuts; and m. means for alternately activating the brake means to reciprocate the pistons.

Claim 21

The improved reciprocating pump claimed in claim 16 wherein each of the first and second piston and cylinder combinations increases progressively from a low pressure piston and cylinder to a high pressure piston and cylinder, and means is proivded for connecting the outlet means of a lower pressure cylinder to the inlet means of the next higher pressure cylinder in the opposite piston and cylinder combination.

Claim 22

The improved reciprocating pump claimed in claim 17 wherein an inner and an outer shell between each medial plate and lateral plate enclose the first and second piston and cylinder combinations.

Claim 23

The improved reciprocating pump claimed in claim 18 wherein the inlet and outlet means to each cylinder comprises check valves.

Claim 24

The improved reciprocating pump claimed in claim 18 including means from each cylinder to discharge blow-by fluid into the space between the shells.

Claim 25

The improved reciprocating pump claimed in claim 20 including means to introduce blow-by fluids from the shells into in inlets of the cylinders.