A kind of internally-geared low-pulsation gear pump
The present invention relates to a kind of crescent gear pump, a kind of specifically internally-geared low-pulsation gear pump is applicable to mineral oil, emulsified liquid or water to be the system of working medium, is to have the low pulsation of flow, and the characteristics of low noise belong to the fluid transmission field.
In the Fluid Transmission and Control technology, mostly the oil hydraulic pump of use is full depth tooth wheel pump, vane pump and plunger pump, and such pump is when high-pressure large-displacement; Flow and pressure pulsation are big; Noise is big, and the life-span is short, and wherein gear pump occupies and consequence always; It is widely used in the hydraulic system of lathe, automobile, building machinery, injection machine and oilfield machinery, but the pulsation of high-pressure gear pump and noise are that problem to be solved is arranged always.
Summary of the invention
In order to overcome above deficiency, the object of the present invention is to provide a kind of middle and high pressure gear pump of internally-geared low-pulsation.
This research and design the middle and high pressure gear pump of a kind of internally-geared low-pulsation, propose a kind of new by many middle and high pressure gear pumps of internally-geared low-pulsation that crescent gear pump is formed after staggered superposition, except that general advantage with common crescent gear pump; It is in a basic balance also to have radial hydraulic pressure, and flow pulsation is low, the advantage that noise is little; Let the flow of three pairs of inside engaged gears realize staggered superposition; It is original 1/9 that flow pulsation has only, and is lower than 0.5%, and flow increases three times.
The technological scheme that the present invention solves its technical problem employing is: a kind of characteristic of internally-geared low-pulsation gear pump is: motor drives axle 10 rotates; Driving gear 15 connects through spline and axle 10; Engagement drives internal gear 4 and rotates, several pinion in mesh with it 5 that evenly distribute in the ring gear 4 that floats, and the number of small gear 5 can be 2 to 4 and not wait; With retainer 8, support by pintle.Front cover 1, rear end cover 9, intermediate 3, internal gear 4, small gear 5, pintle 7, retainer 8, driving gear 15 constitutes three airtight imbibition chambeies 21, three exhaust chambers 22.Be furnished with filler opening 17 on the front cover 1, be furnished with oil outlet 18 on the rear end cover 9.Intermediate 3 is fixed together through bolt 13 with front cover 1 and rear end cover 9.
A kind of structure of internally-geared low-pulsation gear pump is an example with three small gears that are uniformly distributed with, shown in Figure of description 1, accompanying drawing 2, accompanying drawing 3, accompanying drawing 4, accompanying drawing 5, accompanying drawing 6 and accompanying drawing 7; Internal gear and three small gear dislocation engagements that are uniformly distributed with, the impact and the noise that had been produced in the time of so both can having avoided list to gear engagement can make the flow pulsation of this oil hydraulic pump reduce greatly again.
The present invention compares with background technique, and the beneficial effect that has is:
1. owing to the invention belongs to crescent gear pump, its three pairs of small gears and internal gear dislocation engagement realize that low discharge pulses, and its flow pulsation can be lower than 1%, delivery quality be improved significantly.
2. compare with common crescent gear pump, suffered radial hydraulic pressure is a balance on its internal gear.
So the present invention has simple in structure, pressure and flow pulsation is little, operate steadily, low noise advantages can be used as mesohigh high-volume hydraulic pump and uses.
Description of drawings
Below in conjunction with accompanying drawing and instance the present invention is further specified.
Fig. 1 is a structure principle chart of the present invention.
Fig. 2 is a structure exploded perspective view of the present invention.
Fig. 3 is the structural principle schematic representation of Fig. 1 of the present invention.
Fig. 4 is the retainer structural representation of Fig. 1 of the present invention.
Fig. 5 is the A-A sectional drawing of the retainer of Fig. 1 of the present invention.
Fig. 6 is the pintle schematic representation of Fig. 1 of the present invention.
Fig. 7 is that the B-B of the pintle of Fig. 1 of the present invention cuts open and shows schematic representation.
1. front covers among the figure, 2. housing seal circle, 3. intermediate, 4. internal gear, 5. small gear, 6. small sealing ring; 7 pintles, 8. retainer, 9. rear end cover, 10. transmission shaft, 11. bearing caps, 12. bearings; 13. the housing connecting bolt, 14. bearing cap stove bolts, 15.. driving gear, 16. nuts, 17. filler openings; 18. oil outlet, 19. filler opening ring shaped slots, 20. oil outlet ring shaped slots, 21. imbibition chambeies, 22. exhaust chambers
Like Fig. 1,2,3,4,5,6, shown in 7, driving gear 15 connects with axle 10 through spline, drive internal gear 4 and rotate, in the internal gear 4 evenly 3 of distributions pinion in mesh 5 and retainer 8 are supported by pintle 7 together with it.Front cover 1, rear end cover 9 be with internal gear 4, three small gears 5, retainer 8 and pintles 7, constitutes three airtight imbibition chambeies 21, three exhaust chambers 22, is furnished with filler opening 17 on the front cover 1, is furnished with oil outlet 18 on the rear end cover 9.Front cover 1, rear end cover 9 among intermediate and Fig. 2 are fixed together; 3 in front cover 1, rear end cover 9 and intermediate are with seal ring 2 sealings; Connect with bolt 13, have retainer filler opening ring shaped slot 19 and retainer oil outlet ring shaped slot 20 on the retainer 8, with small sealing ring 6 sealings.
During this invention work; 10 rotations of motor drives axle, driving gear rotates through spline and axle synchronously, drives internal gear 4 rotations; Three small gears 5 rotate with retainer 8 simultaneously; Pressured fluid gets into three pairs of internal gear low pressure seal chambeies by liquid entering hole 17 through pintle 7, inside hydraulic fluid port in retainer filler opening ring shaped slot 19, retainer 8, and liquid is discharged by liquid outlet 18 through retainer oil outlet ring shaped slot 20, pintle 7 then.
This invention since internal gear 4 simultaneously and the 5 dislocation engagements of three small gears, both cocoa significantly reduced its flow pulsation, had avoided single impact and noise that is produced during to gear engagement again, flow pulsation is lower than 0.5%.