Reciprocating piston pump for conveying a medium

Abstract

A reciprocating piston pump includes a pump module, a drive, and an auxiliary piston. The pump module includes a cylinder head, a cylinder and a piston that form a conveying chamber. The piston converts a drive movement of the drive into conveying and suctioning stroke movements. The auxiliary piston is between the drive and the piston. The cylinder, the piston and the auxiliary piston convert the drive movement into auxiliary conveying and suctioning stroke movements, and convert the auxiliary conveying stroke movement into the conveying stroke movement of the piston via a lubricating medium in a lubricating chamber formed by the cylinder, the piston and the auxiliary piston head. A head surface of the auxiliary piston is smaller than a head surface of the piston, so that, during the auxiliary conveying stroke movement, a pressure in the lubricating chamber is greater than a pressure in the conveying chamber.

Claims

1. A reciprocating piston pump for conveying a medium, comprising: at least one pump module; a drive; and an auxiliary reciprocating piston; wherein the at least one pump module includes a cylinder head, a cylinder and a reciprocating piston; wherein the reciprocating piston has a reciprocating piston head with a reciprocating piston head surface; wherein the cylinder head, the cylinder and the reciprocating piston head form a conveying chamber; wherein the reciprocating piston is designed for converting a drive movement of the drive into a conveying stroke movement and into a suctioning stroke movement of the reciprocating piston in the cylinder along a longitudinal axis; wherein the cylinder head, the cylinder and the reciprocating piston are designed for converting the conveying stroke movement into a conveying of a medium out of the conveying chamber by making the conveying chamber smaller; wherein the auxiliary reciprocating piston is arranged between the drive and the reciprocating piston and has an auxiliary reciprocating piston head with an auxiliary reciprocating piston head surface; wherein the cylinder, the reciprocating piston and the auxiliary reciprocating piston head form a lubricating chamber for a lubricating medium for lubricating contact surfaces between the cylinder and the reciprocating piston and contact surfaces between the cylinder and the auxiliary reciprocating piston; wherein the cylinder, the reciprocating piston and the auxiliary reciprocating piston are designed for converting the drive movement into an auxiliary conveying stroke movement and into an auxiliary suctioning stroke movement of the auxiliary reciprocating piston in the cylinder along the longitudinal axis and for converting the auxiliary conveying stroke movement of the auxiliary reciprocating piston into the conveying stroke movement of the reciprocating piston via the lubricating medium in the lubricating chamber; and wherein the auxiliary reciprocating piston head surface is smaller than the reciprocating piston head surface, so that, during the auxiliary conveying stroke movement, a pressure of the lubricating medium in the lubricating chamber is greater than a pressure of a medium in the conveying chamber.

2. The reciprocating piston pump according to claim 1, wherein, the cylinder has a cylinder inner lateral surface concentric with the longitudinal axis and having a cylinder radius; wherein the reciprocating piston has a reciprocating piston outer lateral surface concentric with the longitudinal axis and having a reciprocating piston radius; wherein the auxiliary reciprocating piston has an auxiliary reciprocating piston outer lateral surface concentric with the longitudinal axis and having an auxiliary reciprocating piston radius; and wherein both the reciprocating piston radius and the auxiliary reciprocating piston radius match the cylinder radius and the reciprocating piston radius and the auxiliary reciprocating piston radius are the same.

3. The reciprocating piston pump according to claim 1, wherein the reciprocating piston has a relief reciprocating piston and the auxiliary reciprocating piston has a relief cylinder in the auxiliary reciprocating piston head matching the relief reciprocating piston; wherein the relief cylinder has a relief chamber and/or is connected to a relief chamber; and wherein the relief reciprocating piston is a shaft.

4. The reciprocating piston pump according to claim 3, wherein the relief reciprocating piston and the relief cylinder limit a piston distance between the reciprocating piston and the auxiliary reciprocating piston along the longitudinal axis to a maximum piston distance.

5. The reciprocating piston pump according to claim 1, wherein the reciprocating piston pump has a bearing; and wherein the bearing is arranged between the drive and the auxiliary reciprocating piston and is designed for converting the drive movement into the auxiliary conveying stroke movement and into the auxiliary suctioning stroke movement.

6. The reciprocating piston pump according to claim 5, wherein the drive has a drive shaft, wherein the drive shaft has a drive eccentric with an eccentric sliding surface; wherein the auxiliary reciprocating piston has an auxiliary reciprocating piston sliding surface; wherein the eccentric sliding surface and the auxiliary reciprocating piston sliding surface form the bearing; and wherein the drive shaft and the auxiliary reciprocating piston are designed for converting the drive movement of the drive shaft in the form of a rotation via the bearing into the auxiliary conveying stroke movement and into the auxiliary suctioning stroke movement.

7. The reciprocating piston pump according to claim 6, wherein the drive shaft has a drive lubrication line and a rotary slide valve for controlling the supply of the lubricating medium into the bearing; wherein the rotary slide valve has a drive shaft recess in the drive shaft over an angular range of rotation of the drive shaft, so that a supply of the lubricating medium to the bearing takes place only over the angular range; and wherein the drive lubrication line is a channel in the drive shaft and in the drive eccentric.

8. The reciprocating piston pump according to claim 7, wherein the drive lubrication line has at least one check valve.

9. The reciprocating piston pump according to claim 5, wherein the auxiliary reciprocating piston has an auxiliary reciprocating piston lubrication line; wherein the auxiliary reciprocating piston lubrication line connects the lubrication chamber and the auxiliary reciprocating piston sliding surface for supplying the bearing with the lubricating medium; and wherein the auxiliary reciprocating piston lubrication line is a channel in the auxiliary reciprocating piston.

10. The reciprocating piston pump according to claim 9, wherein the auxiliary reciprocating piston lubrication line has at least one check valve.

11. The reciprocating piston pump according to claim 1, wherein the reciprocating piston pump has a longitudinal slide valve for controlling the supply of the lubricating medium into the lubrication chamber; wherein the longitudinal slide valve has at least one cylinder opening in the cylinder for supplying the lubricating medium into the lubrication chamber; and wherein the at least one cylinder opening is a groove, pocket and/or bore.

12. The reciprocating piston pump according to claim 11, wherein the at least one cylinder opening releases a supply of the lubricating medium to the lubricating chamber when the reciprocating piston is in the region of a reversal point from the suctioning stroke movement towards the conveying stroke movement.

13. The reciprocating piston pump according to claim 11, wherein the reciprocating piston pump has a lubricating pump for supplying the at least one pump module and/or the drive with the lubricating medium; and wherein the reciprocating piston pump is designed for supplying the lubricating medium from the lubricating pump to the longitudinal slide valve and/or to a drive lubrication line.

14. The reciprocating piston pump according to claim 1, wherein the reciprocating piston has a shaft extending from the reciprocating piston head; and wherein the cylinder, the reciprocating piston head, the shaft, and the auxiliary reciprocating piston head form the lubricating chamber.

15. The reciprocating piston pump according to claim 14, wherein the shaft is a relief reciprocating piston; and wherein the auxiliary reciprocating piston has a relief cylinder in the auxiliary reciprocating piston head matching the relief reciprocating piston.

16. The reciprocating piston pump according to claim 15, wherein the relief cylinder has a relief chamber and/or is connected to a relief chamber.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In detail, a plurality of possibilities are provided for designing and further developing the reciprocating piston pump. For this, reference is made to the following description of embodiments in conjunction with the drawings.

(2) FIG. 1 illustrates an abstracted perspective sectional view of a first embodiment of a reciprocating pump.

(3) FIG. 2 illustrates an abstracted perspective view of a cylinder of the first embodiment.

(4) FIG. 3 illustrates an abstracted perspective view of a reciprocating piston of the first embodiment FIGS. 4a and 4b illustrate two different abstracted perspective views of an auxiliary reciprocating piston of the first embodiment.

(5) FIG. 5 illustrates an abstracted perspective sectional view of a second embodiment of a reciprocating pump.

(6) FIG. 6 illustrates a perspective view of a third embodiment of a reciprocating piston pump.

DETAILED DESCRIPTION

(7) FIG. 1 shows a first embodiment of a reciprocating pump 1 for pumping a medium. It has a pump module 2, a drive 3, a bearing 4 and a lubrication pump 5.

(8) The pump module 2 has a cylinder head 6, a cylinder 7, see also FIG. 2, a reciprocating piston 8, see also FIG. 3, and an auxiliary reciprocating piston 9, see also FIGS. 4a, 4b.

(9) The cylinder 7 has a cylinder inner lateral surface 11 concentric to a longitudinal axis 10 with a cylinder radius 12. The reciprocating piston 8 has a reciprocating piston bottom 13 with a reciprocating piston head surface 14 and a reciprocating piston outer lateral surface 15 concentric to the longitudinal axis 10 with a reciprocating piston radius 16. The auxiliary reciprocating piston 9 is disposed between the drive 3 and the reciprocating piston 8, has an auxiliary reciprocating piston head surface 17 with an auxiliary reciprocating piston head surface 18, an auxiliary reciprocating piston outer surface 19 concentric with the longitudinal axis with an auxiliary reciprocating piston radius 20, and an auxiliary reciprocating piston sliding surface 21. The reciprocating piston radius 16 and the auxiliary reciprocating piston radius 20 are the same and match the cylinder radius 12.

(10) The reciprocating piston 8 has a relief reciprocating piston 22, and the auxiliary reciprocating piston 9 has a relief cylinder 23 in the auxiliary reciprocating piston head 17 to match the relief reciprocating piston 22. The relief cylinder 23 is connected to the surroundings as a relief chamber via a relief line 24. In this embodiment, the relief reciprocating piston 22 is is a shaft.

(11) The relief stroke piston 22 and the relief cylinder 23 limit a piston distance between the reciprocating piston 8 and the auxiliary reciprocating pistons 9 along the longitudinal axis 10 to a maximum piston distance. For this purpose, the relief reciprocating piston 22 has a ring 26 and the relief cylinder 23 has a groove 27 matching the ring 26. The reciprocating piston 8 and the auxiliary reciprocating piston 9 are movable relative to each other along the longitudinal axis 10 in correspondence with the ring 26 and the groove 7.

(12) The drive 3 has a drive shaft 28 and the drive shaft 28 has a drive eccentric 29 with an eccentric sliding surface 30. The drive shaft 28 without a drive eccentric 29 is designed as a crankshaft with a crank pin 31, wherein the crank pin 31 is rotatably arranged in the drive eccentric 29. Rotational movement of the drive eccentric 29 is prevented by an eccentric shape of the eccentric sliding surface 30 in conjunction with the overlying auxiliary reciprocating piston sliding surface 21.

(13) The eccentric sliding surface 30 and the auxiliary reciprocating piston sliding surface 21 form the bearing 4. The bearing 4 is arranged between the drive 3 and the auxiliary reciprocating piston 9. The drive shaft 28 with the drive eccentric 29 and the auxiliary reciprocating piston 9 are designed for converting a drive movement 32 of the drive shaft 28 in the form of a rotation via the bearing 4 into an auxiliary conveying stroke movement 33 and into an auxiliary suctioning stroke movement 34 of the auxiliary reciprocating piston 9 in the cylinder 7 along the longitudinal axis 10. Thus, the bearing 4 is designed for converting the driving movement 32 into the auxiliary conveying stroke movement 33 and into the auxiliary suctioning stroke movement 34.

(14) The cylinder head 6, the cylinder 7 and the reciprocating piston head 9 form a conveying chamber 35. Further, the cylinder 7, the reciprocating piston 8 and the auxiliary reciprocating piston head 17 form a lubrication chamber 36 for a lubricating medium for lubricating contact surfaces between, on the one hand, the cylinder 7 and, on the other hand, the reciprocating piston 8 and the auxiliary reciprocating piston 9. In this embodiment, the contact surfaces are, on the one hand, the cylinder inner lateral surface 11 and the reciprocating piston outer lateral surface 15 and, on the other hand, the cylinder inner lateral surface 11 and the auxiliary reciprocating piston outer lateral surface 19.

(15) The cylinder 7, the reciprocating piston 8 and the auxiliary reciprocating piston 9 are designed for converting the driving movement 32 into the auxiliary conveying stroke movement 33 and the auxiliary suctioning stroke movement 34 of the auxiliary reciprocating piston 9 in the cylinder 7 along the longitudinal axis 10, and also for converting the auxiliary conveying stroke movement 33 of the auxiliary reciprocating piston 9 into a conveying stroke movement 37 of the reciprocating piston 8 in the cylinder 7 along the longitudinal axis 10 via a lubrication chamber 36. In the present embodiment, the cylinder 7, the reciprocating piston 8 and the auxiliary reciprocating piston 9 are further designed for converting the auxiliary suctioning stroke movement 34 of the auxiliary reciprocating piston 9 into a suctioning stroke movement 3 of the reciprocating piston 8 in the cylinder 7 along the longitudinal axis 10 via a lubrication chamber 36.

(16) In this respect, the reciprocating piston 8 is designed for converting the drive movement 32 of the drive 3 into the conveying stroke movement 37 and into the suctioning stroke movement 38 of the reciprocating piston 8 in the cylinder 7 along the longitudinal axis 10.

(17) The cylinder head 6, the cylinder 7 and the reciprocating piston 8 are designed for converting the conveying stroke movement 37 of the reciprocating piston 8 into a conveyance of a medium from the conveying chamber 35 by making the conveying chamber 35 smaller. For this, the cylinder head 6 has a cylinder head controller which ensures an inflow of a medium into the conveying chamber 35 during the suctioning stroke movement 38 and an outflow of a medium from the conveying chamber 35 during the conveying stroke movement 37. For this purpose, the cylinder head controller comprises an inflow valve and an outflow valve. Neither the cylinder head controller nor the inflow valve and the outflow valve are shown. In this embodiment, the cylinder head 6, the cylinder 7, and the reciprocating piston 8 are also designed for converting the suctioning stroke movement 38 into a suctioning of a medium into the conveying chamber 35 by increasing the conveying chamber 35.

(18) The auxiliary reciprocating piston head surface 18 is smaller than the reciprocating piston head surface 14 because the auxiliary reciprocating piston head surface 18, unlike the reciprocating piston head surface 14, lacks a cross-sectional area of the relief cylinder 23. As a result, during the auxiliary conveying stroke movement 33 of the auxiliary reciprocating piston 9, a pressure of a lubricant in the lubricating chamber 36 is greater than a pressure of a medium in the conveying chamber 35 resulting from the conveying stroke movement 37 of the reciprocating piston 8.

(19) The auxiliary reciprocating piston 9 has an auxiliary reciprocating piston lubrication line 39. The auxiliary reciprocating piston lubrication line 39 connects the lubrication chamber 36 and the auxiliary reciprocating piston sliding surface 21 to each other for supplying the bearing 4 with a lubricating medium. The auxiliary reciprocating piston lubrication line 39 is a channel in the auxiliary reciprocating piston 9. Preferably, the drive eccentric 29 has an auxiliary lubrication line connecting the eccentric sliding surface 30 to contact surfaces between the crank pin 31 and the drive eccentric 29 so that these contact surfaces are also supplied with a lubricating medium during operation. However, this auxiliary lubrication line is not shown here.

(20) The reciprocating pump 1 further comprises a longitudinal slide valve 40 for controlling the supply of a lubrication medium into the lubrication chamber 36. The longitudinal slide valve 40 has a cylinder opening 41 in the cylinder 7 for feeding a lubrication medium into the lubrication chamber 36. The cylinder opening 41 is a bore. The cylinder opening releases the supply of a lubrication medium into the lubrication chamber 36 when the reciprocating piston 8 is in the region of a reversal point from the suctioning stroke movement 38 to the conveying stroke movement 37.

(21) The lubrication pump 5 is designed for supplying a lubrication medium to the pump module 2 and the actuator 3, and the reciprocating piston pump 1 is designed for supplying a lubrication medium from the lubrication pump to the longitudinal slide valve 40. During operation of the reciprocating piston pump 1, the auxiliary reciprocating piston lubrication line 39 not only supplies the contact surfaces between, on the one hand, the cylinder 7 and, on the other hand, the reciprocating piston 8 and the auxiliary reciprocating piston 9, but also supplies the bearing 4 with a lubricating medium for lubrication. The bearing 4 is supplied from the lubrication chamber 36 via the auxiliary reciprocating piston lubrication line 39.

(22) FIG. 5 shows a second embodiment of a reciprocating piston pump 1 for supplying a medium. In the following, only the differences to the first embodiment are described. Otherwise, the explanations regarding the first apply analogously to the second embodiment.

(23) In contrast to the first embodiment, the reciprocating pump 1 does not have the described longitudinal slide valve 40 in the second embodiment. Instead, the drive shaft 28 has a drive lubrication line 42. Accordingly, the drive lubrication line 42 extends through the drive shaft 28 itself as well as through the drive eccentric 29. The part of the drive lubrication line 42 in the drive eccentric 29 thus corresponds to that of the auxiliary lubrication line in the first embodiment.

(24) Further, the drive shaft 28 has a rotary slide valve 43 for controlling the supply of a lubricating medium into the bearing 4. The rotary slide valve 43 has a drive shaft recess 44 in the drive shaft 28 over an angular range of a rotation of the drive shaft 28, whereby a supply of a lubricating medium into the bearing 4 occurs only over the angular range. In this embodiment, the drive lubrication line 42 is a channel in the drive shaft 28 and in the drive eccentric 29. The rotary slide valve 43 is formed by the drive shaft recess 44 and the drive lubrication line 42 in the eccentric 29. The rotary slide valve 43 also ensures a supply of lubricant to contact surfaces between the drive shaft 28 and the drive eccentric 29.

(25) The lubrication pump 5 is designed for supplying a lubricant to the pump module 2 and the drive 3, and the reciprocating pump 1 is designed for supplying a lubricant from the lubrication pump 5 to the drive lubrication line 42. Through the drive lubrication line 42 and the auxiliary reciprocating piston lubrication line 39, not only the bearing 4 but also the contact surfaces between on the one hand the cylinder 7 and on the other hand the reciprocating piston 8 and the auxiliary reciprocating piston 9 are supplied with a lubricating medium for lubrication during operation of the reciprocating pump 1. The supply of the contact surfaces between, on the one hand, the cylinder 7 and, on the other hand, the reciprocating piston 8 and the auxiliary reciprocating piston 9, and also the supply of the lubrication chamber 36 with a lubrication medium, take place in this case via the auxiliary reciprocating piston lubrication line 39 and via the bearing 4 from the drive lubrication line 42.

(26) FIG. 6 shows a third embodiment of a reciprocating piston pump 1. In contrast to the first and second embodiments, it has a plurality of pump modules 2. Otherwise, the reciprocating pump 1 is designed like the reciprocating pump described in the first or second embodiment.