DUAL PNEUMO-HYDRAULIC PUMP UNIT

Abstract

The invention comprises a system containing a multipurpose hydraulic unit that can be used in machines and equipment, driven by low-pressure compressed air or other gases, comprising two hydraulic pumps that work together with a hydraulic pressure accumulator, where the main function of the hydraulic pumps is to pump oil to ensure that the hydraulic pressure accumulator (28) is always full, in which the pumping of oil begins with the supply of compressed air, which passes through the pneumatic directional valve (11) and is conveyed to the lower pneumatic chamber (22) or to the upper pneumatic chamber (4) to move the pneumatic cylinder and to push the hydraulic liners of the pumps, which pumps are assembled in parallel with the shaft of the pneumatic cylinder, each on one side, and as such, when the hydraulic chambers move, they exert a force on this volume of oil and force this stored oil out through the check valves to the hydraulic pressure accumulator, where it is kept under pressure and ready for use, and while this volume of oil is being pumped out of the hydraulic chamber, another volume of oil is being drawn into the hydraulic chamber opposite this hydraulic chamber, also to be pumped when the reverse movement of the pneumatic cylinder occurs, at which point said pneumatic cylinder begins pumping this new volume of oil, and so on until the pressure accumulator is full and pumping is stopped as a result of pressure equilibrium being reached, nonetheless maintaining the system under pressure, said system being restarted whenever oil is consumed as a result of the movement of any hydraulic actuator of the machine that is using this invention.

Claims

1-10. (canceled)

11. A dual pneumo-hydraulic pump unit characterized by comprising: hydraulic piston pumps comprising liners; a central pneumatic cylinder comprising a plunger; a set of hydraulic rods; a hydraulic pressure accumulator; hydraulic plungers; bearings; an oil reservoir; pneumatic directional valves; upper hydraulic holes; and upper hydraulic check valves; wherein the central pneumatic cylinder works in the center of the two hydraulic piston pumps; wherein the hydraulic piston pumps are mounted parallel to the plunger of the central pneumatic cylinder, positioned one on each side; and wherein the compressed air or other pressurized gases are used to move the central pneumatic cylinder, as a source of motor energy to pump oil under pressure to the hydraulic pressure accumulator for later activation of the hydraulic actuators.

12. The dual pneumo-hydraulic pump unit according to claim 11, characterized in that the pistons of the hydraulic pumps work inverted, where the set of hydraulic rods and the hydraulic plungers are static and fixed on bearings.

13. The dual pneumo-hydraulic pump unit according to claim 11, characterized in that the liners of the hydraulic pumps move to draw and pump the oil from the oil reservoir to the hydraulic pressure accumulator.

14. The dual pneumo-hydraulic pump unit according to claim 11, characterized in that the pumping process is initiated by a compressor passing through an air handling unit and feeding a pneumatic directional valve and two other pneumatic directional valves.

15. The dual pneumo-hydraulic pump unit according to claim 14, characterized in that the pneumatic directional valves act in the reversal of the central pneumatic cylinder.

16. The dual pneumo-hydraulic pump unit according to claim 11, characterized in that the storage of oil in the hydraulic pressure accumulator occurs through the opening of the upper hydraulic check valves that receive the oil from the upper hydraulic holes.

17. The dual pneumo-hydraulic pump unit according to claim 1, characterized by further comprising hydraulic chambers having communication holes, which are independent and do not communicate with each other.

18. The dual pneumo-hydraulic pump unit according to claim 11, characterized in that the lower hydraulic chambers are filled with oil drawn from the oil reservoir, forcing the opening of lower hydraulic check valves.

19. The dual pneumo-hydraulic pump unit according to claim 1, characterized by further comprising a hydraulic pressure outlet hole.

Description

DESCRIPTION OF THE DRAWINGS

[0029] Next, to enable visualization of the constructivity, application and working of the “DUAL PNEUMO-HYDRAULIC PUMP UNIT”, and to better clarify the technical report, explanations are provided with reference to the accompanying drawings, in which they are represented in an illustrative—not limitative—manner:

[0030] FIG. 1: Sectional drawing of the complete set;

[0031] FIG. 2: Enlarged detail of one of the pumps.

DETAILED DESCRIPTION OF THE INVENTION

[0032] The “DUAL PNEUMO-HYDRAULIC PUMP UNIT” consists of a central pneumatic cylinder (5) and two hydraulic piston pumps (20) and (39) which are mounted in parallel to the axis of the central pneumatic cylinder (5), and disposed one on each side.

[0033] In this invention, the hydraulic pumps (20) and (39) are pistons, work in reserve to conventional systems, that is, the hydraulic rods (8), (18), (27) and (36) and the plungers (15) and (31) are static and fixed on bearings, while what moves to perform the oil suction and pumping are the hydraulic liners (41) and (42) of the hydraulic pumps (20) and (39), which have the function of pumping pump the oil to the hydraulic pressure accumulator (28) and keeping it full and pressurized, always ready for use.

[0034] The pumping process beings with the air coming from a compressor (14), passing through an air handling unit (12) and feeding a pneumatic directional valve (11) and two other pneumatic directional valves (3) and (24), which are the valves responsible for reversing the central pneumatic cylinder (5).

[0035] When the pneumatic directional valve (11) is sending air to the lower pneumatic chamber (22), the upper pneumatic chamber (4) is open and discharging air into the atmosphere, causing the central pneumatic cylinder (5) to start to rise, taking together the two hydraulic liners (41) and (42) of the two hydraulic pumps (20) and (39), which are interconnected with each other by means of a part (40) that is fixed on the tip of the rod of the central pneumatic cylinder (5).

[0036] When the liners (41) and (42) of the hydraulic pumps (20) and (39) begin in rise, the oil in the lower hydraulic chambers (17) and (29) begins to be compressed and, with the force applied to that volume, it starts to be pushed out, passing through the lower hydraulic check valves (10) and (35), which open to allow the oil to be driven to the hydraulic pressure accumulator (28) and stored there.

[0037] While the oil from the lower hydraulic chambers (17) and (29) is pumped, the upper hydraulic chambers (9) and (33) are filled through suction performed by the upward displacement of the two liners (41) and (42) of the hydraulic pumps (20) and (39).

[0038] When the plunger (25) of the central pneumatic cylinder (5) reaches the end of the upward stroke, the upper pneumatic directional valve (3) will be activated and will pilot the pneumatic directional valve (11) which will change position, causing the pressurized air to be directed to the upper pneumatic chamber (4), while the air that was in the lower pneumatic chamber (22) is discharged into the atmosphere, causing the central pneumatic cylinder (5) to begin to descend, bringing with it the liners (41) and (42) of the hydraulic pumps (20) and (39), pushing the oil under pressure through the upper hydraulic holes (6) and (38) which conduct the oil to the upper hydraulic check valves (7) and (37), which are forced to open to allow the passage of oil that will be stored in the hydraulic pressure accumulator (28).

[0039] At the same time that the oil is being pumped into the hydraulic pressure accumulator (28), the lower hydraulic chambers (17) and (29) are being filled by the oil that is being drawn from the oil reservoir (1), forcing the opening of the lower check valves (10) and (35) and passing through the lower hydraulic holes (19) and (26) and led to the lower hydraulic chambers (17) and (29), until they are full and, at the end of the stroke of the plunger (25) of the central pneumatic cylinder (5), will activate the lower directional valve (24), which will pilot the pneumatic directional valve (11) causing it to change position and now start to direct the compressed air to the lower pneumatic chamber (22), passing through the air feed hole (21) of the lower chamber and, at the same time, the air which was compressed in the upper pneumatic chamber (4) begins to leave the air feed hole (23) of the upper chamber, passing through the pneumatic directional valve (11) and is discharged into the atmosphere, restarting the entire pumping process.

[0040] The hydraulic pumps (20) and (39) have a different operating principle, where we can see that the piston is static with the hydraulic rods (8), (18), (27) and (36) supported and fixed on bearings (2), thus providing a guarantee of alignment of the pumps.

[0041] With the displacement of the liners (41) and (42) of the hydraulic pumps (20) and (39), the oil is led into or out of the hydraulic chambers (9), (17), (29) and (33) through communication holes (13), (16), (30) and (32), which are independent and do not communicate with each other in any way, to allow the pumps to work with the suction and pressurization chambers independently.

[0042] When the pressure accumulator (28) is completely filled, the counter pressure generated by the balance of forces, will cause the pneumatic cylinder to stop and remain static, however, keeping the entire system pressurized, and only pumping oil again, automatically, when oil is used through the movement of any hydraulic actuator of the machine or equipment that is using this invention, and that is connected to the equipment through the hydraulic pressure outlet hole (34).