CN2119511U

CN2119511U - Swashplate-conical plunger-type coaxial pump

Info

Publication number: CN2119511U
Application number: CN 91203656
Authority: CN
Inventors: 毛开友; 冯小军; 左永红
Original assignee: XI AN MINING COLLEGE
Current assignee: XI AN MINING COLLEGE
Priority date: 1991-03-09
Filing date: 1991-03-09
Publication date: 1992-10-21

Abstract

The utility model discloses a swash-plate-conical plunger-typed coaxial pump which substitutes the easy wearing port plate and the crawler shoe of axial plunger-typed straight-axis pumps by using a swash-plate-conical plunger driving mode, and improves sealing performance for using a valve-typed flow distribution and an elastic piston ring. The working conditions of environment pollution and large external applied load change is adapted. The utility model can use general hydraulic oil and use high-water-base hydraulic oil and water as a working medium. The utility model has the advantages of simple variable mechanism, small plunger lateral force in despite of a straight-axis pump, good impacting-resistant performance, and good abrasion-resistant performance. The universality and the reliability of oil pumps are improved fundamentally. The utility model has wide development prospects.

Description

Swashplate-conical plunger-type coaxial pump

The utility model belongs to liquid variable capacity axial piston pump.The existing oil pump that drives with oil distribution casing and crawler shoe, though be applied in widely in the engineering machinery, when being used in the mine excavation machinery, because load variations is big, fluid easily pollutes, and the oil temperature is higher, adds that used oil pump is the high-pressure high-flow pump, rotating speed is higher, the PV value of pump is higher, makes between the thrust plate and cylinder body that movement velocity is high, the oil film destructible between crawler shoe and the swash plate, and fastness is easy to wear, and make the life-span of pump shorter, be difficult to adapt to the bad working environments in mine.As introduce the main pump of the AM-500 type coal winning machine of Britain, be generally about two months in the working life in colliery, Datong District.

In recent years, begun in the mining machinery to adopt electricity to get for hydraulic haulage, its main cause is that the reliability of hydraulic system and element is relatively poor, therefore must improve the functional reliability of conventional hydraulic pumps, is current hydraulic Design person's urgent task.

The high water base fluid pressing system is one of direction of present hydraulics development.If hydraulic-pressure pump still adopts thrust plate and crawler shoe system, when adopting high water base fluid to press oil, pressure fuel pump will obviously descend, as Britain HD axial piston pump, pressure is 280bar when using general hydraulic oil, if pressure then is 135bar when adopting the high water base fluid of 95:5 to press oil.At present, high water base pump and water pump all adopt valve formula flow, but valve flow pump nearly all is a metering pump, if when the variable displacement pump, its stroking mechanism complexity has limited using scope.

For a long time, the in-line arrangement pump (three turn pump) that the high overwhelming majority water base or water pump is three plungers, this is a kind of ancient backward pump; The water pump that axial piston is also arranged, but crawler shoe still kept, and pressure is low can not to be extensive use of.

In view of the foregoing, the purpose of this utility model is: 1. improve the ability that oil pump adapts to the mine excavation bad working environments.2. improve the universal performance of oil pump, make it can not only use general hydraulic oil, and can also press oil and water as working medium with high water base fluid.3. make the coaxial pump of valve formula flow can variable, to enlarge using scope.

The utility model is realized as follows: it is the thrust plate of traditional liquid transfiguration axial piston pump and crawler shoe cancellation, balance-cone-shaped plunger formula transmission and valve formula flow have been adopted, be to improve the pressure of pump, between plunger and balance, adopted sphere to contact.Its conventional principle is as shown in Figure 1: drive swash plate 2 by main shaft 1 and rotate, promote balance 3 swings by the bearing on the swash plate 2, make plunger 4 to-and-fro motion in fixed cylinder body 5, and carry out suction oil with oil sucting valve 6 and draining valve 7.Its servo variable displacement control mechanism is: when operation servovalve 9, variable piston 10,11 is moved to right, by variable frame 8 balance 3 inclination angles are increased, with the flow of increase oil pump, when reducing flow as need, then can be by the action of servovalve, make the pressure oil oil return pond in the variable oil cylinder, balance reduces the inclination angle under the promotion of oil pump self pressure, is zero until flow.

The utility model has the advantages that: 1.. the functional reliability height can adapt to the bad working environments of mining machinery, especially if it is higher to be used for its reliability of conventional machinery.2.. can use general hydraulic oil, high water base oil and water are as working medium.3.. energy is variable reliably, and stroking mechanism is simple, and changing in the past, valve pump nearly all is the defective of metering pump.4.. though it is very little to belong to d-axis pump pump plunger lateral force, thereby has improved shock-resistant, anti abrasive ability.

Fig. 1 is the utility model first embodiment's a structural representation.

Fig. 2 is the plan view of the utility model first example structure schematic representation.

Fig. 3 is the left view of the utility model first example structure schematic representation.

Fig. 4 is the utility model second embodiment's a structural representation.

The utility model is described in further detail below in conjunction with accompanying drawing:

Referring to Fig. 1-Fig. 3: when 1 rotation of motor drives main shaft, drive swash plates 2 rotations by the pin on the axle 12, it is the center swing with the pin that swash plate promotes balance 3, thereby can drive plunger 4 and move back and forth, carry out suction oil by oil sucting valve 6 draining valves 7, cylinder body 5 is fixed.When the needs augmented flow, can operate servovalve 9, make the bottom oil-feed of variable piston 10,11, promote piston and move to right, by with the moving to right of the hinged variable frame 8 of swash plate 2, make swash plate assembly (comprising balance) increase the inclination angle, reach the purpose of augmented flow.Reduce flow as need, still operate the logical oil sump in bottom that servovalve 9 makes piston 10,11, rely on the Driving force of oil pump high pressure side plunger, the inclination angle of swash plate is reduced, cause flow to reduce until being zero.The utility model has also adopted spheric roller bearing, and bearing capacity is increased, and generally is that the 2-3 of steel-angle bearing doubly can make the working pressure of pump reach 320bar like this.Though the limit speed of spheric roller bearing is not really high, is roughly 2000-3000rpm, valve formula balance revolution speed is generally 1500-2500rpm, thereby uses this bearing can satisfy performance requirement of the present utility model.

Referring to Fig. 4: this figure is second embodiment's schematic representation of the present utility model, it is that with the difference of Fig. 1 the bearing on balance 3 and the variable frame 8 is different, this example has adopted steel-angle bearing, it is compared with first embodiment, bearing capacity is less, only be applicable to working pressure P＜210bar in, low-capacity pump.

Find out that from above two embodiments the utility model is that the cone-shaped plunger (the eighties new structure) that adopted the clino-axis type pump and the characteristics of motion of balance pump are carried out ingenious combination, both guaranteed that the sphere knot touched, the relative displacement and the speed of friction pair one balance and plunger ball have been reduced again greatly, according to the tangential relative shift that calculates balance and plunger ball only is about 2.2mm, has reduced 105 times than the tangential displacement 230.8mm of crawler shoe on swash plate of similar pump.

Claims

1, a kind of balance-cone-shaped plunger formula coaxial pump, it is characterized in that having cancelled original oil distribution casing and crawler shoe, balance-cone-shaped plunger transmission and valve formula flow have been adopted, drive swash plate 2 by main shaft 1 by pin 12, and the plunger 4 in the promotion balance 3 drive cylinder bodies 5, and be furnished with oil sucting valve 6 and draining valve 7, also be furnished with servovalve 9, the variable piston 10,11 of regulating pump duty in addition and be hinged on variable frame 8 on the swash plate 2.

2,, it is characterized in that contacting for sphere between plunger 4 and the balance 3 according to right 1 described balance-cone-shaped plunger formula coaxial pump.