A pump has a pump body and at least first and second pumping elements, each pumping element including a piston defining a head-end and a rod-end. The pump receives a pressurized fluid at an inlet, and returns fluid through a drain outlet. A hydraulic distributor operates to fluidly connect the head
A pump has a pump body and at least first and second pumping elements, each pumping element including a piston defining a head-end and a rod-end. The pump receives a pressurized fluid at an inlet, and returns fluid through a drain outlet. A hydraulic distributor operates to fluidly connect the head end of an extending piston to the pressurized fluid, and the rod end of the extending piston to the drain outlet. The hydraulic distributor further connects the rod-end of a retracting piston to the drain outlet, and the rod-end of one or more retracting pistons to the drain or to a return pressure, which is lower than an extending pressure.
대표청구항▼
1. A pump, comprising: a pump body;a first pumping element and a second pumping element, each of the first and second pumping elements being independently actuatable to perform a pumping stroke that delivers a pumped amount of fluid at a pump discharge, wherein each of the first and second pumping e
1. A pump, comprising: a pump body;a first pumping element and a second pumping element, each of the first and second pumping elements being independently actuatable to perform a pumping stroke that delivers a pumped amount of fluid at a pump discharge, wherein each of the first and second pumping elements includes a piston slidably disposed to reciprocate within a cylinder and defining a head-end volume and a rod-end volume on either side of the piston within the pump body;a spring disposed to push the piston in a retracting direction in which the head-end volume decreases and the rod-end volume increases;a first head-end passage formed in the pump body and fluidly connected with the head-end volume of the piston of the first pumping element, the first head-end passage forming a first head-end opening;a second head-end passage formed in the pump body and fluidly connected with the head-end volume of the piston of the second pumping element, the second head-end passage forming a second head-end opening;a first rod-end passage formed in the pump body and fluidly connected with the rod-end volume of the piston of the first pumping element, the first rod-end passage forming a first rod-end opening;a second rod-end passage formed in the pump body and fluidly connected with the rod-end volume of the piston of the second pumping element, the second rod-end passage forming a second rod-end opening;a high-pressure fluid inlet formed in the pump body, the high-pressure fluid inlet forming a high-pressure inlet opening;a drain outlet formed in the pump body, the drain outlet forming a drain opening; anda rotor rotatably disposed within the pump body and being fluidly exposed to the high-pressure inlet opening on a first side and to the drain opening on a second side, the rotor forming a radially extending passage that is fluidly open to the drain opening, the rotor further forming a fill opening extending through the rotor between the first side and the second side, the fill opening being surrounded by a seat that fluidly isolates the fill opening from the drain opening;wherein, as the rotor is rotating within the pump body, it assumes at least a first orientation and a second orientation with respect to the pump body; andwherein, in the first orientation, the fill opening is aligned with the first head-end passage to place the first head-end passage in fluid communication with the high-pressure inlet opening, and the radially extending passage overlaps the first rod-end passage to place the first rod-end passage in fluid communication with the drain opening and wherein, in the first orientation, the second head-end passage and the second rod-end passage are fluidly connected to one another and to the drain opening through the radially extending passage. 2. The pump of claim 1, wherein, in the first orientation, the second head-end passage is placed in fluid communication with the drain opening through the radially extending passage. 3. The pump of claim 1, wherein, in the second orientation, the fill opening is aligned with the second head-end passage to place the second head-end passage in fluid communication with the high-pressure inlet opening, and the radially extending passage overlaps the second rod-end passage to place the first rod-end passage in fluid communication with the drain opening. 4. The pump of claim 1, further comprising: a low-pressure fluid inlet formed in the pump body, the low-pressure fluid inlet forming a low-pressure inlet opening that fluidly connects with an annular channel formed in the pump body; anda slot formed in the rotor, the slot being aligned with the annular channel and extending peripherally around the rotor along a chord length of a periphery of the rotor that does not include a chord length occupied by the radially extending passage, wherein the slot extends from the first side to the second side of the rotor. 5. The pump of claim 4, wherein, in the first orientation, the second head-end passage is placed in fluid communication with the drain opening through the radially extending passage and the second rod-end passage is placed in fluid communication with the low-pressure inlet opening through the slot. 6. The pump of claim 4, wherein, in the second orientation, the fill opening is aligned with the second head-end passage and is fluidly isolated from the first head-end passage to place the second head-end passage in fluid communication with the high-pressure inlet opening, and the radially extending passage overlaps the second rod-end passage to place the second rod-end passage in fluid communication with the drain opening. 7. The pump of claim 4, wherein, the second orientation, the first head-end passage is placed in fluid communication with the drain opening through the radially extending passage and the first rod-end passage is placed in fluid communication with the low-pressure inlet opening through the slot. 8. The pump of claim 1, further comprising: a third pumping element that is independently actuatable from the first and second pumping elements, the third pumping element including the piston slidably disposed to reciprocate within a cylinder and defining the head-end volume and the rod-end volume on either side of the piston of the third pumping element within the pump body;a third head-end passage formed in the pump body and fluidly connected with the head-end volume of the piston of the third pumping element, the third head-end passage forming a third head-end opening;a third rod-end passage formed in the pump body and fluidly connected with the rod-end volume of the piston of the third pumping element, the third rod-end passage forming a third rod-end opening;wherein, in the first orientation, the radially extending passage overlaps and fluidly interconnects the first rod-end passage, the second head-end passage, and the third head-end passage to place them in fluid communication with the drain opening. 9. The pump of claim 8, further comprising: a low-pressure fluid inlet formed in the pump body, the low-pressure fluid inlet forming a low-pressure inlet opening that fluidly connects with an annular channel formed in the pump body; anda slot formed in the rotor, the slot being aligned with the annular channel and extending peripherally around the rotor along a chord length of a periphery of the rotor that does not include a chord length occupied by the radially extending passage, wherein the slot extends from the first side to the second side of the rotor. 10. The pump of claim 9, wherein, in the first orientation, the second head-end passage and the third head-end passage are placed in fluid communication with the drain opening through the radially extending passage, and the second rod-end passage and the third rod-end passage are placed in fluid communication with the low-pressure inlet opening through the slot. 11. The pump of claim 10, wherein an extension speed of the first pumping element is faster than a retraction speed of the second and third pumping elements when the rotor is in the first orientation. 12. The pump of claim 9, wherein, in the second orientation, the fill opening is aligned with the second head-end passage and is fluidly isolated from the first head-end passage and the third head-end passage to place the second head-end passage in fluid communication with the high-pressure inlet opening, and the radially extending passage overlaps the second rod-end passage, the first head-end passage, and the third head-end passage to place in fluid communication with one another and with the drain opening. 13. The pump of claim 9, wherein, the second orientation, the first head-end passage is placed in fluid communication with the drain opening through the radially extending passage and the first rod-end passage is placed in fluid communication with the low-pressure inlet opening through the slot. 14. The pump of claim 9, wherein, in a third orientation of the rotor with respect to the pump body, the radially extending passage overlaps and fluidly interconnects the third rod-end passage, the first head-end passage, and the second head-end passage to place them in fluid communication with the drain opening. 15. The pump of claim 14, wherein, in the third orientation, the first head-end passage and the second head-end passage are placed in fluid communication with the drain opening through the radially extending passage, and the first rod-end passage and the second rod-end passage are placed in fluid communication with the low-pressure inlet opening through the slot. 16. The pump of claim 1, wherein each of the first and second pumping elements includes a respective pushrod connected to a rod-end of the piston at one end of the pushrod, and to a plunger reciprocably disposed in a sleeve at another end of the pushrod such that a reciprocal motion of the piston is transferred to the plunger through the pushrod for pumping a fluid in a variable volume created between the plunger and the sleeve.
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