Abstract
Presented is a piston pump comprising: a frame, a control element mounted in a rotatable manner about a central axis with at least one control surface, a plurality of cylinders having pistons displaceable therein, a suction connection for inflow of a fluid into the cylinders, a pressure connection for outflow of the fluid out of the cylinders. The cylinders are connected by lines to the suction and pressure connection. The cylinders, the pistons, and the control element are configured such that the position of the pistons in the cylinders can change by movement of the control element. The cylinders and the pistons are mounted so that they do not rotate completely about the central axis when the control element rotates. So that the piston pump can be operated with low maintenance, it is proposed that the cylinders or the pistons are connected respectively to a rotatably mounted roller.
Claims
1. A piston pump comprising: a frame; a control element mounted in a rotatable manner about a central axis having at least one control surface; a plurality of cylinders, each having pistons displaceable therein; a suction connection for an inflow of a fluid into the plurality of cylinders of the piston pump; and a pressure connection for an outflow of the fluid out of the plurality of cylinders of the piston pump, the plurality of cylinders being connected by lines to the suction connection and to the pressure connection, the plurality of cylinders, the pistons, and the control element being configured in such a way that the position of the pistons in the plurality of cylinders can be changed by movement of the control element, the plurality of cylinders and the pistons being mounted in such a way that the plurality of cylinders and the pistons do not rotate completely about the central axis when the control element rotates, and the plurality of cylinders or the pistons are connected respectively to a rotatably mounted roller, wherein the contact region between the rotatably mounted rollers and the control surface of the control element is lubricant-free.
2. The piston pump according to claim 1, wherein the plurality of cylinders or the pistons are arranged statically and/or tiltably relative to the frame.
3. The piston pump according to claim 1, wherein the frame has a front wall and a rear wall for mounting of the plurality of cylinders.
4. The piston pump according to claim 1, wherein cylinder axes and piston axes extend coaxially.
5. The piston pump according to claim 1, wherein the at least one control surface of the control element is configured in such a way that a plurality of strokes is executed per revolution.
6. The piston pump according to claim 1, wherein the pistons have a spring for retraction of the pistons from the plurality of cylinders.
7. (canceled)
8. The piston pump according to claim 1, wherein the cylinder axes and the piston axes extend parallel to the central axis.
9. The piston pump according to claim 1, wherein a first group of at least one cylinder having a piston movable therein, and a second group of at least one cylinder having a piston movable therein.
10. The piston pump according to claim 9, wherein the first group of at least one cylinder with their pistons and the second group of at least one cylinder with their pistons are arranged on different sides of the control element in an axial direction.
11. The piston pump according to claim 8, wherein the at least one control surface of the control element is directed in an axial direction, and the at least one control surface's axial distance from the plurality of cylinders can be modified by rotation of the control element about the central axis.
12. The piston pump according to claim 4, wherein the cylinder axes and the piston axes extend radially with respect to the central axis.
13. The piston pump according to claim 12, wherein the control element is arranged outside the plurality of cylinders and the pistons in a radial direction and annularly encloses them.
14. The piston pump according to claim 12, wherein the at least one control surface of the control element is directed in a radial direction with respect to the central axis, and a radial distance of the at least one control surface from the cylinders can be modified by rotation of the control element about the central axis.
15. The piston pump according to claim 12, further comprising trailing arms for guiding the rotatably mounted rollers, wherein each rotatably mounted roller is assigned a trailing arm.
16. The piston pump according to claim 15, wherein the trailing arms are mounted rotatably about a static support ring.
17. The piston pump according to claim 1, wherein the piston pump is configured for use in a wind turbine and comprises a pump medium that is water.
18. The piston pump according to claim 17, wherein the wind turbine has a tower with a gondola and a rotor, the piston pump and the turbine, the rotor being mechanically connected to the piston pump, and the piston pump and the turbine being connected to one another by fluid lines.
19. The piston pump according to claim 18, wherein the piston pump is arranged in the gondola, and the turbine is arranged outside the gondola and outside the tower.
20. The piston pump according to claim 18, wherein the wind turbine has an electrical generator and an electrical transformer, which are arranged outside the gondola and outside the tower.
21. (canceled)
22. The piston pump according to claim 17, wherein the wind turbine has a supply pump.
Description
[0042] The invention will be explained in more detail below with the aid of a drawing which merely represents a preferred exemplary embodiment. In the drawing:
[0043] FIG. 1 shows an axial piston pump according to the invention in perspective view,
[0044] FIG. 2 shows the axial piston pump of FIG. 1 in a rear view,
[0045] FIG. 3 shows the axial piston pump of FIG. 1 in a side view,
[0046] FIG. 4 shows the axial piston pump of FIG. 1 in a plan view,
[0047] FIG. 5 shows the axial piston pump of FIG. 1 in a sectional view along the section plane V-V indicated in FIG. 4,
[0048] FIG. 6 shows the use of the axial piston pump of FIG. 1 in an offshore wind turbine in a schematic representation,
[0049] FIG. 7A shows a radial piston pump according to the invention in perspective view from the front side,
[0050] FIG. 7B shows the radial piston pump of FIG. 7A in perspective view from the rear side,
[0051] FIG. 8 shows the radial piston pump of FIG. 7A in a front view,
[0052] FIG. 9 shows the radial piston pump of FIG. 7A in a side view,
[0053] FIG. 10 shows the radial piston pump of FIG. 7A in a plan view, and
[0054] FIG. 11 shows the use of the radial piston pump of FIG. 7A in an offshore wind turbine in a schematic representation.
[0055] FIG. 1 shows an axial piston pump 1 according to the invention in a perspective view. The axial piston pump 1 has a frame 2, which comprises two base stands 3, a front wall 4 and a rear wall 5. The front wall 4 and the rear wall 5 are approximately round and are separated from one another by a plurality of spacer rods 6 distributed over the circumference, in such a way that the front wall 4 and the rear wall 5 are arranged in parallel planes. Rotatably mounted in the frame 2 there is a driveshaft 7, at the end of which a flange 8 is provided. A rotor shaft (not shown in FIG. 1) of a wind turbine may for example be connected to the flange 8. The driveshaft 7 is arranged on a central axis M extending centrally through the axial piston pump 1. The driveshaft 7 is mounted rotatably in the housing 2 by two bearings 9, one bearing 9 being arranged in the front wall 4 and the other bearing 9 being arranged in the rear wall 5.
[0056] The axial piston pump 1 shown in FIG. 1 furthermore has an annular control element 10, which is connected, while being fixed non-rotatably, by a plurality of spokes 11 to the driveshaft 7. A rotational movement of the driveshaft 7 therefore leads to a rotational movement of the control element 10. The control element 10 has two opposing control surfaces 12, 12, each of which is directed in the axial direction and is configured with a wave-shape. Furthermore, the axial piston pump 1 shown in FIG. 1 has ten cylinders 13, 13 and ten pistons 14, 14 assigned to these ten cylinders.
[0057] The cylinders 13 and the pistons 14 of the axial piston pump 1 shown in FIG. 1 may be divided into two groups: the five front cylinders 13 are affixed on the front wall 4, the five front cylinders 13 being arranged circularly around the central axis M and oriented in the axial directioni.e. coaxially with the central axis M. The five front pistons 14 are mounted movably in the axial direction in the five front cylinders 13, and therefore likewise arranged circularly around the central axis M and oriented in the axial directioni.e. coaxially with this central axis M. The five rear cylinders 13, on the other hand are affixed on the rear wall 5, the five rear cylinders 13 being arranged circularly around the central axis M and oriented in the axial directioni.e. coaxially with the central axis M. The five rear pistons 14 are mounted movably in the axial direction in the five rear cylinders 13, and are therefore likewise arranged circularly around the central axis M and oriented in the axial directioni.e. coaxially with this central axis M.
[0058] In the axial piston pump shown in FIG. 1, the pistons 14, 14 are connectedfor example by means of piston rodsto rotatably mounted rollers 15. The rollers 15 may also be divided into two groups: front rollers 15 are mounted rotatably on the front pistons 14, and rear rollers 15 are mounted rotatably on the rear pistons 14. The rollers 15 are arranged in such a way that they roll on the control surfaces 12 of the control element 10, the front rollers 15 rolling on the front control surface 12 and the rear rollers 15 rolling on the rear control surface 12. Because of the wave-shaped configuration of the control surfaces 12, the position of the control surfaces 12 in the axial direction varies during rotation of the control element 10. The effect of this is that, when there is an increased axial width of the control element 10 (greater axial distance between the two control surfaces 12, 12) the two rollers 15, 15 are pushed in the axial direction outwards (i.e. in the direction of the front wall 4 and the rear wall 5). The result of this is that the pistons 14, 14 connected to the rollers 15, 15 are pushed into the cylinders 13, 13 assigned to them, and in doing so displace the fluid located in the cylinders 13, 13. On the other hand, a reduced axial width of the control element 10 (smaller axial distance between the two control surfaces 12, 12) has the effect that the rollers 15, 15 are moved inwards in the axial direction (i.e. in the direction of the control element 10). To this end, the axial piston pump 1 has ten springs 16, which are arranged in such a way that they push the pistons 14, 14 out of the cylinders 13, 13. For example, a helical spring 16 is wound around each piston 14, 14. The effect of the spring forces is that the rollers 15, 15 always follow the contour of the control surfaces 12, 12, and the pistons 14, 14 connected to the rollers 15, 15 are withdrawn again from the cylinders 13, 13 assigned to them; the cylinder volume increasing again. The rollers 15, 15 are thus mounted in such a way that they roll on the control surfaces 12, 12 of the control element 10.
[0059] In the axial piston pump 1 shown in FIG. 1, the volume in the cylinders 13, 13 can thus be cyclically varied by rotation of the driveshaft 7. In order to be able to use the cyclic variation of the cylinder volumes for the delivery of a fluid, each cylinder 13, 13 has an inlet 17, 17 with an inlet line 18, 18 and an outlet 19, 19 with an outlet line 20, 20. In addition, each cylinder 13 has two non-return valves (not shown in FIG. 1). The inlet lines 18, 18 of all the cylinders 13, 13 are brought together at a common suction connection 21. In a similar way, the outlet lines 20 of the front cylinders 13 are brought together at a common front pressure connection 22 and the outlet lines 20 of the rear cylinders 13 are brought together at a common rear pressure connection 22. The two pressure connections 22, 22 may be brought together at a common pressure connection (not shown in FIG. 1).
[0060] In FIG. 2, the axial piston pump 1 of FIG. 1 is represented in a rear view. Those regions of the axial piston pump 1 which have already been described in connection with FIG. 1 are provided in FIG. 2and in all further figureswith corresponding references. The rear view makes it possible to look at the rear wall 5 of the axial piston pump 1 and at the inlet lines 18 and the outlet lines 20 of the rear cylinders 13 affixed on the rear wall 5. The central axis M and the driveshaft 7 extending along this central axis M can also be seen clearly. In addition, the suction connection 21 and the rear pressure connection 22 can also be seen in the lower region.
[0061] FIG. 3 shows the axial piston pump of FIG. 1 in a side view. In FIG. 3 those regions of the axial piston pump 1 which have already been described in connection with FIG. 1 or FIG. 2 are provided with corresponding references. In the side view, the arrangement of the cylinders 13 and of the pistons 14, which is symmetrical in relation to a symmetry plane S, can be seen particularly well: in each case, a front cylinder 13 (with a front piston 14) and a rear cylinder 13 (with a rear piston 14) lie on a cylinder axis Z which is arranged parallel to the central axis Mand therefore likewise axially. The cylinder axis Z coincides with a piston axis K, the two axes Z, K thus being colinear. It is therefore an axial piston pump 1 in which the front pistons 14 and the rear pistons 14 move counter to one another and are mirror-invertedly always in the same position (as in the case of a piston engine in boxer engine design).
[0062] In FIG. 4, the axial piston pump 1 of FIG. 1 is represented in a plan view. In FIG. 4 as well, those regions of the axial piston pump 1 which have already been described in connection with FIG. 1 to FIG. 3 are provided with corresponding references. The symmetrical arrangement of many components in relation to the symmetry plane S can also be seen well in the plan view: besides the cylinders 13 and the pistons 14, the front wall 4 and the rear wall 5 are also arranged symmetrically in relation to the symmetry plane S. The internal construction of the axial piston pump 1 will be explained in more detail below in connection with FIG. 5 with the aid of the section plane V-V indicated in FIG. 4.
[0063] FIG. 5 shows the axial piston pump 1 of FIG. 4 in a sectional view along the section plane V-V indicated in FIG. 4. In FIG. 5 as well, those regions of the axial piston pump 1 which have already been described in connection with FIG. 1 to FIG. 4 are provided with corresponding references. In the sectional view, it can be seen clearly that the driveshaft 7 is configured as a hollow shaft. Furthermore, the configuration of the non-rotatable connection between the control element 10, its spokes 11 and the driveshaft 7 can be seen: the spokes 11 of the control element 10 are connected at their radially inner ends to a hub 23, which is connected in a non-rotatable fashionfor example by means of a press-fit connectionto the driveshaft 7.
[0064] An enlarged region of a rear cylinder 13 is also represented in FIG. 5. In the enlarged view, it can be seen that the cylinder 13 is connected to the rear wall 5. The piston 14, which can be slid into and out of the cylinder 13, is guided through an opening 24 provided in the rear wall 5. At its free end, the piston 14 is connected to the roller 15, which is mounted on both sides by means of a fork 25. The spring 16 is configured as a helical spring, which is wound around the piston 14. Externally, the spring 16 is supported on the inner side of the rear wall 5, and internally the spring 16 is supported on the outer side of the fork 25. The cylinder 13 has a cylindrical internal space 26, the volume of which varies depending on the setting of the piston 14. The cylinder 13 has an inlet 17 and an outlet 19, an inlet line 18 being connected to the inlet 17 and an outlet line 20 being connected to the outlet 19. In order to achieve flow through the cylinder 13 in the direction of the arrows indicated, the cylinder 13 has two valves 27A, 27B, which may for example be configured as disc non-return valves with a spring. The first valve 27A is arranged at the inlet 17 of the cylinder 13, and the second valve 27B is arranged at the outlet 19 of the cylinder 13. During a movement of the piston 14 out of the cylinder 13 (towards the right in FIG. 5), the first valve 27A is open so that fluid can flow through the inlet line 18 and the inlet 17 into the internal space 26 of the cylinder 13, while the second valve 27B is closed so that no return flow can take place from the outlet line 20. This step is also referred to as suction. During a movement of the piston 14 into the cylinder 13 (towards the left in FIG. 5), on the other hand, the settings of the valves 27A, 27B are reversed: the first valve 27A is closed so that no return flow can take place into the inlet line 18, and the second valve 27B is open so that the fluid can be expelled by the piston 14 from the internal space 26 of the cylinder 13 through the outlet 19 and the outlet line 20. This step is also referred to as displacement.
[0065] The construction described above, and the functionality explained in more detail above relate not only to the rear cylinders 13 shown in FIG. 5 but to all five rear cylinders 13 andin a corresponding wayall five front cylinders 13 of the axial piston pump 1.
[0066] The axial piston pump 1 presented above is designed in such a way that, with a power of about 3300 kW, a pressure of about 200 bar and a rotational speed of about 10 rpm, it has a delivery power of about 8900 l/min.
[0067] FIG. 6 shows the use of the axial piston pump 1 of FIG. 1 in an offshore wind turbine in a schematic representation. The wind turbine 28 shown in FIG. 6 comprises two towers standing on the bottom of a body of water, on each of which a gondola 30 is affixed. A rotatable rotor 31, respectively with three rotor blades 32, is provided on each gondola 30. Arranged in the two gondolas 30 is a pump, which may be the axial piston pump 1 described above. The wind turbine 28 additionally comprises a platform 33, likewise standing on the bottom of the body of water, on which a supply pump 34, a turbine 35, an electrical generator 36 and an electrical transformer 37 are arranged.
[0068] The wind turbine shown in FIG. 6 has two liquid circuits, the liquid preferably being water, in particular seawater or saltwater. Starting from the supply pump 34, the water is pumped through a supply line 38, which is divided into two low-pressure lines 39. The low-pressure lines 39 convey the water to the two towers 29 and to the two axial piston pumps 1 arranged in the gondolas 30. There, the low-pressure lines 39 are connected to the suction connections 21, already described above, of the axial piston pumps 1. The rotors 31 are connected by means of the flanges 8 directly to the driveshafts 7 of the axial piston pumps 1, so that rotation of the rotors 31 leads to rotation of the driveshafts 7. If required, gearing may be provided between the rotors 31 and the driveshafts 7; preferably, however, the rotors 31 are connected directly to the driveshafts 7 of the axial piston pumps 1, so that no conversion of the rotational speeds and torques takes place. In the axial piston pumps 1, a significant increase takes place in the pressure of the water, which leaves the axial piston pumps 1 through the pressure connections 22, 22 and is pumped from there through high-pressure lines 40 to the turbine 35 arranged on the platform 33. The water flows through the turbine 35, the water pressure being reduced, and subsequently flows back to the supply pump 34, so that the circuit is a closed circuit.
[0069] The pressure difference between the entry and exit of the turbine 35 leads to conversion of potential and kinetic energy of the water into rotational energy, which leads to rotation of the turbine shaft. The turbine shaft transmits the rotational energy to the electrical generator 36, which generates an AC electrical voltage. In the wind turbine 28, the generation of electrical energy has thus been relocated from the gondola 30 into the platform 33. Further components, for example brakes, couplings and gearing, may be provided between the turbine 35 and the electrical generator 36. The AC voltage may subsequently be converted in an electrical transformer 37. The electrical transformer may, for example, be a converter (change of frequency and amplitude of the AC voltage) or a rectifier (conversion of AC voltage into DC voltage). The output of the electrical transformer 37 is connected to a high-voltage line 41, by which the electrical energy generated can be fed into the grid.
[0070] For reasons of simpler representability, the wind turbine 28 shown in FIG. 6 has a platform 33 to which two towers 29 are connected. As an alternative, it would also be possible to connect a larger number of towers 29 to the platform 33, for example parts of an offshore wind farm.
[0071] FIG. 7A shows a radial piston pump 42 according to the invention in perspective view from the front side and FIG. 7B shows the same radial piston pump 42 in perspective view from the rear side. The radial piston pump 42 has a frame 2, which is configured in the shape of a ring and comprises a front wall 4 and a rear wall 5. The front wall 4 and the rear wall 5 are approximately round and are separated from one another by a plurality of spacer rods 6 distributed over the circumference, in such a way that the front wall 4 and the rear wall 5 are arranged in parallel planes.
[0072] The radial piston pump 42 shown in FIG. 7A and FIG. 7B additionally has an annular control element 10, which may for example be connected to a rotor shaft (not shown in FIG. 7A and FIG. 7B) of a wind turbine and therefore be driven by the rotor shaft. A rotational movement of the rotor shaft therefore leads to a rotational movement of the control element 10. The control element 10 has a control surface 12 directed radially inwards, which is configured with a wave-shape. Furthermore, the radial piston pump 42 shown in FIG. 7A and FIG. 7B has twelve cylinders 13 and twelve pistons 14 assigned to these cylinders.
[0073] The cylinders 13 and the pistons 14 of the radial piston pump 42 shown in FIG. 7A and FIG. 7B are mounted tiltably on the frame 2, to which end bearings 43 are provided in the front wall 4 and in the rear wall 5. By the tiltable mounting, the cylinders 13 and the pistons 14 can be rotated about the bearing 43, although this takes place only to a very small extent (less than 5) during operation. The cylinders 13 and the pistons 14 are arranged circularly around a central axis M and are oriented in the radial directioni.e. radially with respect to the central axis M.
[0074] In the radial piston pump 42 shown in FIG. 7A and FIG. 7B, the pistons 14 are connectedfor example by means of piston rodsto rotatably mounted rollers 15. The rollers 15 are arranged in such a way that they roll on the radially inwardly directed control surface 12 of the control element 10. Because of the wave-shaped configuration of the control surface 12, the position of the control surface 12 in the radial direction varies during rotation of the control element 10. The effect of this is that, when there is an increased axial width of the control element 10 (smaller radial distance between the control surface 12 and the central axis M) the rollers 15 are pushed inwards in the radial direction (i.e. in the direction of the central axis M). The result of this is that the pistons 14 connected to the rollers 15 are pushed into the cylinders 13 assigned to them, and in doing so displace the fluid located in the cylinders 13. On the other hand, a reduced axial width of the control element 10 (larger radial distance between the control surface 12 and the central axis M) has the effect that the rollers 15 can be moved outwards in the radial direction (i.e. away from the central axis M). To this end, the radial piston pump 42 has twelve springs 16 which push the pistons 14 out of the cylinders 13. For example, a helical spring 16 is wound around each piston 14. The effect of the spring forces is that the rollers 15 always follow the contour of the control surface 12, and the pistons 14 connected to the rollers 15 are withdrawn again from the cylinders 13 assigned to them, the cylinder volume increasing again. The rollers 15 are thus mounted in such a way that they roll on the control surface 12 of the control element 10.
[0075] In the radial piston pump 42 shown in FIG. 7A and FIG. 7B, the volume in the cylinders 13 can thus be cyclically varied by rotation of the control element 10. In order to be able to use the cyclic variation of the cylinder volumes for the delivery of a fluid, each cylinder 13 has an inlet 17 with an inlet line 18 and an outlet 19 with an outlet line 20. The inlet lines 18 of all the cylinders 13 are brought together at a common suction connection 21. In a similar way, the outlet lines 20 of the cylinders 13 are brought together at a common pressure connection 22.
[0076] The radial piston pump 42 shown in FIG. 7A and FIG. 7B has a non-rotatable support ring 44, which is for example connected to the frame 2. Trailing arms 45 are rotatably mounted on the support ring 44 and are likewise connected to the rollers 15 in a rotatably mounted fashion. Preferably, each roller 15 is assigned its own trailing arm 45, so that the number of trailing arms 45 may correspond to the number of rollers 15. The trailing arms 45 are used for the purpose of absorbing forces extending in the circumferential direction and keeping the pistons 14 substantially free of transverse forces. The support ring 44 and be seen clearly in FIG. 7A and the trailing arms 45 can be seen clearly in FIG. 7A.
[0077] The radial piston pump 42 of FIG. 7A is represented in a perspective view in FIG. 8. Those regions of the radial piston pump 42 which have already been described in connection with FIG. 7A and FIG. 7B are provided in FIG. 8and in all further figureswith corresponding references. The front view makes it possible to look at the trailing arms 45: each trailing arm 45 is rotatably connected to the support ring 44 by means of an articulation point 46. The effect of this is that the rollers 15 mounted rotatably at the other end of the trailing arms 45 can move only along a circular path B (schematically represented in FIG. 8). The result of this is that the pump elements (i.e. the units consisting of cylinders 13 and pistons 14) can be tilted slightly in the circumferential direction and counter to the circumferential direction when the rollers 15 roll on the control surface 12 of the control element 10. The tiltability of the pump elements is made possible by the fact that the cylinders 13 are connected tiltably to the frame 2 by the bearings 43. The pump elements are thus not exactly arranged radially in every setting; since the deviations are minimal, however, the term radial piston pump may nevertheless be used.
[0078] FIG. 9 shows the radial piston pump 42 of FIG. 7A in a side view. In FIG. 9 is well, those regions of the radial piston pump 42 which have already been described in connection with FIG. 7A to FIG. 7B are provided with corresponding references. In the side view, the particularly narrow design of the radial piston pump 42 in the axial direction can be seen. In addition, the suction connections 21 and the pressure connection 22 on the rear side of the radial piston pump 42 can be seen. The side view furthermore shows that the trailing arms 45 may be configured with a fork shape (or Y-shape) and may therefore enclose the rollers 15 on both sides and reliably guide them.
[0079] FIG. 10 shows the radial piston pump 42 of FIG. 7A in a plan view. In FIG. 10 is well, those regions of the radial piston pump 42 which have already been described in connection with FIG. 7A to FIG. 7B are provided with corresponding references. In the plan view as well, the very slender design of the radial piston pump 42 in the direction of the central axis M can be seen clearly. Likewise, the connections (suction connection 21, pressure connections 22) provided on the side can be seen clearly.
[0080] Lastly, FIG. 11 shows the use of the radial piston pump 42 of FIG. 7A in an offshore wind turbine 28 in a schematic representation. As a supplement to the schematic overall construction shown in FIG. 6, FIG. 11 is intended to make it possible to look into the interior of the gondola 30 of the wind turbine. In FIG. 11 is well, those regions of the radial piston pump 42 which have already been described above are provided with corresponding references. The low-pressure line 39 already described in connection with FIG. 6 conveys water to the tower 29 and to the radial piston pump 42 arranged in the gondola 30. There, the low-pressure line 39 is connected to the suction connections 21, already described above, of the radial piston pump 42. The rotor 31 is directly connected to the control element 10 of the radial piston pump 42, so that rotation of the rotor 31 leads to rotation of the control element 10. Preferably, the rotor 31 is connected directly to the control element 10 of the radial piston pump 42, so that no conversion of the rotational speeds and torques takes place. In the radial piston pump 42, a significant increase takes place in the pressure of the water, which leaves the radial piston pump 42 through the pressure connection 22 and is pumped from there through high-pressure line 40 to a turbine 35 (not represented in FIG. 11).
LIST OF REFERENCES
[0081] 1: axial piston pump [0082] 2, 2: frame [0083] 3: base stand [0084] 4, 4: front wall [0085] 5, 5: rear wall [0086] 6, 6: spacer rod [0087] 7: driveshaft [0088] 8: flange [0089] 9: bearing [0090] 10, 10: control element [0091] 11: spoke [0092] 12, 12, 12: control surface [0093] 13, 13, 13: cylinder [0094] 14, 14, 14: piston [0095] 15, 15, 15: roller [0096] 16: spring [0097] 17, 17, 17: inlet [0098] 18, 18, 18: inlet line [0099] 19, 19, 19: outlet [0100] 20, 20, 20: outlet line [0101] 21, 21: suction connection [0102] 22, 22, 22: pressure connection [0103] 23: hub [0104] 24: opening [0105] 25: fork [0106] 26: internal space [0107] 27A, 27B: valve [0108] 28: wind turbine [0109] 29: tower [0110] 30: gondola [0111] 31: rotor [0112] 32: rotor blade [0113] 33: platform [0114] 34: supply pump [0115] 35: turbine [0116] 36: electrical generator [0117] 37: electrical transformer [0118] 38: supply line [0119] 39: low-pressure line [0120] 40: high-pressure line [0121] 41: high-voltage line [0122] 42: radial piston pump [0123] 43: bearing [0124] 44: support ring [0125] 45: trailing arm [0126] 46: articulation point [0127] B: path [0128] K: piston axis [0129] M: central axis [0130] S: symmetry plane [0131] Z: cylinder axis
