CN203239571U - Rigid compensation screw pump - Google Patents

Abstract

The utility model discloses a rigid compensation screw pump which comprises a shell (8), a front end cover (5) and a rear end cover (1) which are in sealing connection with two ends of the shell, wherein a drive shaft (6) and a driven shaft (4) are arranged in the shell, a right screw gear (9) and a left screw gear (2) which can be meshed are respectively arranged on the drive shaft and the driven shaft, shaft bushings (3) fixed on the shell are arranged on the drive shaft and the driven shaft, an oil inlet (14) and an oil outlet (7) are respectively formed in the shell, a lower oil distributing hole (13) and an upper oil distributing hole (15) which are communicated with the oil inlet and the oil outlet are respectively formed in the shell, and oil grooves (12) are formed in the front end cover and the rear end cover. According to the rigid compensation screw pump, the friction force between the shaft bushings of the end faces of the gears can be completely eliminated, the internal leakage and the sealing failure of the screw pumps are effectively prevented, and the volume efficiency of an oil pump is ensured; the rigid compensation screw pump is compact and simple in structure, convenient to manufacture and install, good in sealing property, stable in flow, high in output pressure and free from noise.

Description

The rigid compensation volute pump

Technical field

The utility model relates to volute pump, especially relate to have stability of flow, pressure pulsation is little, volumetric efficiency is high, the rigid compensation volute pump that noise is little.

Background technique

At present the rotor in the volute pump mostly adopts Novikov gears with double circular arc tooth profiles, compare with the straight-tooth gear oil pump, it be a kind ofly have that fluid flow is stable, the delivery pressure pulsation is little, without pocketed oil, volumetric efficiency is high and noise is little volute pump.But volute pump is when work, can produce an axial thrust load at circular tooth gear, this axial thrust load acts directly on end face of shaft bush, make and produce a frictional force between circular tooth gear end face and the end face of shaft bush, operating time one is long, can make end face of shaft bush produce wearing and tearing, increases the axial clearance of oil pump, make in the oil pump generation and let out, reduce the volumetric efficiency of oil pump.The problem that increases for solving oil pump axial clearance, people have carried out flexible improvement at oil pump structure, the measure of the first architecture advances is: offer one between end cap and the axle sleeve and the oil groove that communicates with oil outlet (high pressure side) at oil pump end cap, when axle sleeve contacts end face and increases because the gap appears in friction with circular tooth gear, oil groove pressure is pushed axle sleeve to circular tooth gear, gap between circular tooth gear and the axle sleeve is reduced, let out in preventing thereby reach, improve the purpose of oil pump volumetric efficiency, but oil groove pressure has also increased the positive pressure of the product of circular tooth gear and axle sleeve simultaneously, increased the frictional force between axle sleeve and the circular tooth gear, when axial clearance is excessive, can make the seal fails on the end cap; The measure of the second architecture advances is: at the end cap that faces the circular tooth gear end face hole that communicates with oil outlet (high pressure side) is set, a floating pearl is set in the hole, oil pressure applies a thrust opposite with the circular tooth gear axial force by floating pearl to the circular tooth gear axial end, because the factor affecting such as oil pressure and engaging force, when rotation speed change larger, this thrust always lags behind the gear axial force, cause the circular tooth gear axial force can become to impact shape and act on end face of shaft bush, make the frictional force of circular tooth gear and end face of shaft bush become more complicated, the frictional force of gear and axle sleeve also can't be eliminated, and can not effectively eliminate in the oil pump and let out.The oil pump of above-mentioned improvement structure is let out even more serious in the injection machine hydraulic system of servo-drive in the seal failure that causes and the oil pump.

The model utility content

For the existing problem of volute pump in the above-mentioned prior art, the utility model provide a kind of not only compact structure simple, make easy for installation, and sealing can be good, let out in can not producing, flow pressure is stable, noise free, the rigid compensation volute pump that volumetric efficiency is high.

The technological scheme that the technical problems to be solved in the utility model is taked is: described rigid compensation volute pump comprise housing with the sealed at both ends front cover that links to each other of housing and rear end cover, in housing, be provided with driving shaft and driven shaft, being respectively arranged with on described driving shaft and the driven shaft can intermeshing right-hand screw gear and left hand screw gear, be provided with the axle sleeve that is fixed on the housing on described driving shaft and the driven shaft, described axle sleeve and driving shaft, driven shaft and spiral gear end face are Spielpassung, described driving shaft one end stretches out outside the housing and with motor and links to each other, the described driving shaft the other end links to each other with bearing fit with the driven shaft two ends, be respectively arranged with filler opening and oil outlet at housing, be respectively arranged with the lower minute oilhole that communicates with filler opening and oil outlet and divide oilhole at housing, be provided with bearing hole and oil groove at front cover and rear end cover, described oil groove one end communicates with bearing hole, and the other end communicates with a lower minute oilhole.

When oil pump is assembled, first axle sleeve is contained on driving shaft and the driven shaft, again bearing is fitted in driving shaft one end and driven shaft two ends with spiral gear, again driving shaft and driven shaft are packed into together in the housing, bearing is fixedly installed in the bearing hole, covers front cover, finish assembling.In oil pump, axle sleeve no longer with the spiral gear end contact, axial force all acts on the bearing of axle head, because axle sleeve is not subject to responsive to axial force, can not produce frictional force between axle sleeve and the spiral gear end face, gap between axle sleeve and the spiral gear end face can not increase, and oil pump is not let out and seal failure in can not occuring, thereby is the volumetric efficiency that can not reduce oil pump.

The utility model adopts the rigid compensation structure, can eliminate the frictional force between the existing axle sleeve of gear face fully, effectively prevent from letting out in the volute pump and seal failure, guaranteed the volumetric efficiency of oil pump, not only compact structure is simple for it, manufacturing is easy for installation, and good, the stability of flow of sealing energy, delivery pressure is high, and noise free.

Description of drawings

Fig. 1 is structural representation of the present utility model,

Fig. 2 is the A-A sectional structure schematic diagram of Fig. 1,

Fig. 3 is that the B-B of Fig. 1 analyses and observe the rotational structure schematic diagram.

In the drawings, 1, rear end cover 2, left hand screw gear 3, axle sleeve 4, driven shaft 5, front cover 6, driving shaft 7, oil outlet 8, housing 9, right-hand screw gear 10, bearing 11, bearing hole 12, oil groove 13, down divide oilhole 14, filler opening 15, on divide oilhole 16, low voltage side oil groove 17, high pressure side closed hole.

Embodiment

At Fig. 1, among Fig. 2 and Fig. 3, described rigid compensation volute pump comprises housing 8, front cover 5 and rear end cover 1, front cover and rear end cover and housing are sealed at both ends to be fixedly linked, in housing, be provided with driving shaft 6 and driven shaft 4, being respectively arranged with on described driving shaft and the driven shaft can intermeshing right-hand screw gear 9 and left hand screw gear 2, described driving shaft one end sealing is stretched out outside the housing and with motor (not shown in FIG.) and is linked to each other, be fixedly installed axle sleeve 3 at housing, described axle sleeve is distributed on the driving shaft and driven shaft at spiral gear two ends, described inner hole of shaft sleeve and driving shaft and driven shaft are Spielpassung, end face of shaft bush and spiral gear end face are Spielpassung, be provided with a bearing hole 11 at front cover, be provided with two bearing holes 11 at rear end cover, be fixedly installed bearing 10 in the described bearing hole, described bearing is preferably thrust ball bearing, the driving shaft the other end is connected with the bearing secure fit with the driven shaft two ends, facing a left side, the housing upper and lower in right-hand screw gear neutral position is respectively arranged with the low voltage side with filler opening 14() and oil outlet 7(high pressure side), be provided with the upper minute oilhole 15 (triangular in shape) that communicates with oil outlet on housing top, be provided with the lower minute oilhole 13(that communicates with filler opening in lower housing portion triangular in shape), be provided with oil groove 12 at front cover and rear end cover, described oil groove one end communicates with bearing hole, the other end is connected with a lower minute oilhole, and oil groove can make bearing obtain good lubricating; Also can be provided with low voltage side oil groove 16 at front cover and rear end cover simultaneously, described lower minute oilhole is connected with the low voltage side oil groove, the low voltage side oil groove is connected with filler opening again, described front and rear cover is provided with high pressure side closed hole 17, on divide that oilhole one end links to each other with oil outlet, the other end links to each other with the high pressure side closed hole.

Claims (2)

1. rigid compensation volute pump, it comprise housing (8) with the sealed at both ends front cover that links to each other of housing (5) and rear end cover (1), in housing, be provided with driving shaft (6) and driven shaft (4), being respectively arranged with on described driving shaft and the driven shaft can intermeshing right-hand screw gear (9) and left hand screw gear (2), be provided with the axle sleeve (3) that is fixed on the housing at driving shaft and driven shaft, described axle sleeve and driving shaft, driven shaft and spiral gear end face are Spielpassung, described driving shaft one end stretches out outside the housing and with motor and links to each other, the described driving shaft the other end cooperates with bearing (10) with the driven shaft two ends and links to each other, be respectively arranged with filler opening (14) and oil outlet (7) at housing, it is characterized in that: be respectively arranged with lower minute oilhole (13) communicating with filler opening and oil outlet and upper minute oilhole (15) at housing, be provided with bearing hole (11) and oil groove (12) at front cover and rear end cover, described oil groove one end communicates with bearing hole, and the other end communicates with a lower minute oilhole.

2. rigid compensation volute pump according to claim 1, it is characterized in that: described bearing (10) is thrust ball bearing.

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