SU1652648A1 - Drive of variable capacity positive-displacement pump - Google Patents

Description

The invention relates to a nesostroenie technique and can be used, in particular, in driving dosing pumps.

The purpose of the invention is to provide a linear law for regulating the stroke of the pusher at a constant position of its front extreme point of movement.

Fig. 1 shows a kinematic diagram of the drive device of the variable displacement pump, side view; Fig. 2 is a kinematic diagram of a pump drive device, an axonometric view; on fig.Z - rotary unit of the drive device, made in the form of a cylinder; figure 4 - section a - a in fig.Z; FIG. 5 shows a drive unit for a volumetric pump with two planetary-crank mechanisms.

The drive device of the variable displacement pump contains a crank-planetary mechanism, which has a carrier 1 with 2 satellite 3 located inside the central wheel with a gear crown 4, kinematically connected through gear 5 with an engine (not shown) and through satellite 3 with a gear crown 6 central wheel 2i with a pusher pump 7. The mechanism 8 for adjusting the stroke of the pusher 7 is connected to the central wheel 2 of the crank-planetary mechanism so that it can be rotated while adjusting the stroke of the pusher 7. The satellite 3 is equipped with a crank 9 rigidly connected to it, for example, with a slide 10, while the satellite 3 can be for example, it is kinematically connected with the pusher 7 through the crank 9 with the possibility of longitudinal movement of the crank 9 9 pivotally mounted in the pusher of the slider 10.

The ratio of the diameters of the initial circles of the gear rims 4 and 6, respectively, of the satellite 3 and the central wheel 2, and the crank-planetary mechanism is made in the form of a single unit 11 (figure 2) with the possibility of rotation when adjusting the stroke of the pusher 7 around the axis. coinciding with the axis 10 of the crank 9 at its maximum distance from the axis of the carrier 1.

The radius of the crank 9 of the satellite 3 can be made equal to the radius of the initial circle of the ring gear 4 of the satellite 3.

The rotary unit 11 of the drive device can be made in the form of a cylinder 12 (FIGS. 3 and 4), the longitudinal axis 13 of which coincides with the axis of rotation of the block 11 while adjusting the stroke length of the pusher 7.

For the purpose of unloading the satellite 3, the rotary unit 11 can also be equipped with an additional crank but-pa l and tactile mechanism (FIG. 5), which is connected to the engine (not shown) and has a general view with the main crank-planetary satellite mechanism 3. as a single-shaft shaft with two gear rims 4 and 14. Rotation from the engine to the additional crank-n l and to the tilt-free mechanism is transmitted from the drive shaft

15 through a gear 16, a synchronizing shaft 17 and a gear 18.

The output link 19 of the adjustment mechanism 8 is associated with the housing 20 of the rotary

block 11 through axis 21

The transmission of torque from the drive shaft 15 to the carrier 1 in the drive device (in FIG. 3) is carried out using the intermediate gear 22.

0Drive drive gear pump

works as follows

The torque delivered to the drive shaft 15 is transmitted from the engine via a gear to the carrier 1. When the carrier 1 rotates, the satellite 3 moves along the diameter of the initial circumference of the gear ring of the central wheel 2.

In the position of the crank-planetary mechanism shown in FIG. 1 by solid lines, the slider 10 moves in the groove of the pusher 7 without moving it (zero stroke position). When the rotary block 11 is rotated around the axis 13 at a certain angle (the position of the crank-planetary mechanism is shown by dashed lines), the slider 10 moves in the groove of the pusher 7, giving it a reciprocating motion with the move y.

Design Example

0 of the drive unit shown in Figs. 3 and 4 is different in that. that the rotary block 11 is made in the form of a cylinder, the longitudinal geometric axis of which coincides with the axis 13 of the rotation of block 11 when

5 adjusting the stroke of the pusher 7 This simplifies the design, expands the possibility of assembling the mechanism 8 for adjusting the stroke length of the pusher 7, and expands the choice of the location of the axis 21. In this version

0, the transmission of torque from the drive shaft 15 to the carrier 1 is carried out through gear 5 with the intermediate gear 22. The remaining kinematic connections remain unchanged and the principle of operation

5, the drive device is the same as that of the above-described drive device of FIGS. 1 and 2.

An example embodiment of the drive device shown in

0 figure 5. is different in that. that in the housing 20 of the rotary unit 11 there are two cranking-planetary mechanisms consisting of two carriers 1. having a common satellite 3, made in the form of a single-knee shaft with two gear rims 4 and 14. The supply of torque from the driving shaft 15 to the carrier 1 is carried out through a gear 16. The synchronizing shaft 17 and the gear 18. The remaining kinematic connections remain

and the principle of operation of the drive device is the same as that of the above described drive devices of FIG. 14.

From the kinematic scheme of the drive device shown in Fig. 1, it can be seen that the position of the extreme dead center of the pusher movement does not depend on the angle

and the tilt of the rotary unit 11. The linear law of adjustment of the stroke of the pusher 7 is ensured as a result of the direct proportional dependence of the length of the stroke of the pusher 7 on the length x of movement of the output link 19 of the mechanism 8 of adjustment of the stroke of the pusher 7.

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Claims (4)

(54X57) 1. DRIVING DEVICE FOR REGULATED VOLUME PUMP, in particular, a metering pump containing a crank-planetary mechanism, which has a carrier with a satellite with gear ring located inside the central wheel, kinematically connected to the engine and, through the satellite, with a ring gear of the vertical wheel and with a pump follower, a length adjustment mechanism the stroke of the pusher, which is connected to the central wheel of the planetary-crank mechanism with the possibility of its rotation when adjusting the stroke length of the pusher, moreover, in order to ensure a linear law of control of the stroke length of the pusher with the front extreme point of displacement unchanged, the satellite is equipped with a crank rigidly connected to it, while the satellite is kinematically connected to the pusher through the crank with the possibility of converting the rotational movement of the crank into a return - translational movement of the pusher, the ratio of the diameters of the initial circumferences of the gear rims of the satellite and the central wheel is 1: 2. and the planetary-crank mechanism is made in the form of a single unit with the possibility of its rotation when adjusting the stroke length of the pusher around an axis that coincides with the extreme point of the crank at its maximum distance from the carrier axis. 2 Device by π. 1, with the exception of those. that the radius of the crank of the satellite is made equal to the radius of the initial circumference of the gear ring of the satellite. 3 The device according to PP. 1 and 2, on the basis of which, in order to simplify the design, the rotary block is made in the form of a cylinder, the longitudinal axis of which coincides with the axis of rotation of the block when adjusting the stroke length of the pusher. 4. The device according to claims 1 to 3, characterized in that, for the purpose of unloading the satellite, the rotary unit is equipped with an additional planetary-crank mechanism, which is connected to the engine and has a satellite in common with the main crank-planetary mechanism, made in the form of a single-track shaft with two gear rims. 1652648 A1