Background technique
When existing structure plunger was finished the fluid pressurization and injected the work of pump cover hyperbaric chamber in cylinder inner bore, plunger endoporus high-voltage oil liquid was not all to enter the pump cover hyperbaric chamber, still residual high pressure oil.When plunger moment entered the oil suction district, plunger internal high pressure fluid compression shock of forming of release of pressure suddenly in oil sucting cavity can produce flow pulsation, increases the operating noise of axial deflection plunger.
See Fig. 2, existing oil distribution casing has adopted triangular groove design to reduce flow pulsation mostly, reduces noise.The triangular groove that is 6 ° of angles of inclination with the plane has been adopted in low pressure oil distribution port end, and the triangular groove that is 7 ° of angles of inclination with the plane has been adopted in high pressure oil distribution port end; The groove point of triangular groove is to the back gauge of oil distribution port, less than plunger endoporus 0.3mm; Triangular groove cross section angle is 60 °.
The problem that this design exists: the triangular groove channels designs is too little, and between oil-feed district to oil extraction district, cylinder body inner fluid pre-compression pressure is too big, between oil extraction district to oil-feed district, the residual high pressure oil liquid pressure discharges deficiency in the plunger hole, and big to the flow pulsation of variation in pressure, noise can be too high.
Summary of the invention
The utility model is adjusted the angle design of original oil distribution casing triangular groove by testing repeatedly at above-mentioned deficiency, has reached the purpose that reduces noise.
Axial variable plunger pump oil distribution casing device comprises swash plate, oil distribution casing between pump cover and cylinder body, and oil distribution casing high and low pressure oil distribution port goes out oil pocket with pump cover respectively, oil suction chamber is connected; Bottom, cylinder body 9 holes is a kidney slot, width is consistent with 9 bore dias, plunger is set in the cylinder body, oil distribution casing cooperates on the plane with cylinder body, from low pressure oil distribution port end the triangular groove that is 10 ° ± 15 ' angle of inclination with the plane is set, the triangular groove that is 11 ° ± 15 ' angle of inclination with the plane is set from high pressure oil distribution port end.
For better effect: 10 ° ± 15 ', the groove point of 11 ° ± 15 ' triangular groove is to the back gauge of oil distribution casing high and low pressure oil distribution port, less than cylinder body kidney slot width 2 ± 0.2mm.
Triangular groove cross section angle is 80 ° ± 15 ', root is designed to ¢ 4mm * 0.5mm semicircle orifice, as the pressure transition district of triangular groove and oil distribution casing oil duct.
Axial variable plunger pump oil distribution casing device materials is an alloyed copper.
The triangular groove that is 10 ° ± 15 ' angle of inclination with the plane has been adopted in low pressure oil distribution port end, because pump is to the self-priming effect of fluid, along with reducing gradually of volume, fluid in the interior cavity of plunger and cylinder body formation has been played the precompression effect, change 10 ° of angles of inclination, strengthened pre compressed magnitude.
After the high-voltage oil liquid that forms after the plunger compression work outputed to out oil pocket, plunger had endoporus, and plunger is not the cylinder base of working fully when work simultaneously, because high-voltage oil liquid is not discharged fully, remnants have high-voltage oil liquid in the plunger endoporus.The triangular groove that is 11 ° ± 15 ' angle of inclination with the plane has been adopted in high pressure oil distribution port end, make plunger turn to lower compression upwards pull up oil suction in, form with oil outlet and to be connected, pressure release is carried out in inside, avoided the generation of pressure surge.
The groove point of triangular groove is to the back gauge of oil distribution port, less than cylinder body kidney slot width 2 ± 0.2mm.Triangular groove cross section angle is 80 ° ± 15 ', root has been processed ¢ 4mm * 0.5mm semicircle orifice, as the pressure transition district of triangular groove and oil distribution casing oil duct.Make plunger turn to lower compression upwards pull up oil suction in, the plunger endoporus does not form the region of no pressure with turnover oil pocket road, the flow pulsation that has formed when having avoided moment to enter turnover oil pocket road.
Through experiment showed, above-mentioned parameter adjustment, the level of noise that flow pulsation is caused has tangible change.
Survey report
Inspection content: oil distribution casing triangular groove angle is to the influence of noise
Inspection equipment:
Oil hydraulic pump speed change test bench: 75KW ISO B level
Noise level monitor 7ES 1350A
Resistance strain type pressure sensor CY-YB-03
1.5 grades of 0-400bar of pressure gauge Y150-40
Turbine flux transmitter CL-15
0~100 ° of digital thermometer
Oil distribution casing triangular groove angle is to the data logger that influences of noise:: unit: dB (A)
Embodiment
See Fig. 1, the oil effect of joining of axial variable plunger pump oil distribution casing: pump cover 1, oil distribution casing 2, cylinder body 3, plunger 4, swash plate 5.Oil distribution casing 2 is between pump cover 1 and cylinder body 3, and oil distribution casing 2 high and low pressure oil distributing zones go out oil pocket with pump cover 1 respectively, oil suction chamber is connected; Plunger 4 to-and-fro motion in cylinder body 3 is finished oil suction and is pressed oil work, and the fluid in the pump cover oil suction chamber enters in the cylinder body 3 through oil distribution casing 2 low pressure oil distributing zones; Cylinder body 3 Rotate 180s °, because the effect of swash plate 5, plunger 4 is finished compression work in cylinder body 3, produced simultaneously high pressure oil enters pump cover 1 through oil distribution casing 2 high pressure oil distributing zones and goes out oil pocket.
See Fig. 3, low pressure oil distribution port end adopted with the plane be the triangular groove that A-A is 10 ° ± 15 ' angle of inclination, high pressure oil distribution port end adopted with the plane be the triangular groove that B-B is 11 ° ± 15 ' angle of inclination; The groove point of triangular groove is to the back gauge of oil distribution port, less than cylinder body kidney slot width 2 ± 0.2mm.The triangular groove cross section be the C-C angle be 80 ° ± 15 ', root has been processed ¢ 4mm * 0.5mm semicircle orifice, as the pressure transition district of triangular groove and oil distribution casing oil duct.