HYDRAULIC SYSTEM FOR STABILIZER DRIVE

Abstract

The hydraulic system according to the invention is a hydraulic system for controlling a stabilizer drive, in particular for controlling an angle of attack and/or a pivoting out and in of a stabilizer wing, preferably for ships. The hydraulic system according to the invention has a rotary vane motor that changes the angle of attack of the stabilizer wing and/or a hydraulic cylinder for pivoting the stabilizer wing out and in, along with a first hydraulic circuit. The first hydraulic circuit furthermore comprises a low-pressure circuit and a high-pressure circuit, a device for providing an admission pressure of the low-pressure circuit, and two anti-cavitation valves which separate the first low-pressure circuit from the first high-pressure circuit. The hydraulic system according to the invention is furthermore characterized in that a first hydraulic pump driven by an electric motor and having two connections is integrated in the high-pressure circuit and is hydraulically connected to the rotary vane motor and/or the hydraulic cylinder.

Claims

1. Hydraulic system for controlling an angle of attack and/or a pivoting out and in of a stabilizer wing comprising: a rotary vane motor that changes the angle of attack of the stabilizer wing and/or a hydraulic cylinder for pivoting the stabilizer wing out and in; a first hydraulic circuit having: a low-pressure circuit and a high-pressure circuit; a device for providing an admission pressure of the low-pressure circuit; two anti-cavitation valves separating the low-pressure circuit from the high-pressure circuit; a first hydraulic pump driven by an electric motor and having two connections integrated in the high-pressure circuit and hydraulically connected to the rotary vane motor and/or the hydraulic cylinder; the two connections of the first hydraulic pump each fluidically connected to a first line, wherein the first line is fluidically connected to the rotary vane motor and/or the hydraulic cylinder; and the two connections of the first hydraulic pump each fluidically connected via a check valve to the first line.

2. Hydraulic system according to claim 1, wherein the electric motor is a variable-speed electric motor and the first hydraulic pump is a simple hydraulic pump, or the electric motor is a constant-speed electric motor and the first hydraulic pump is a variable-volume hydraulic pump.

3. Hydraulic system according to claim 1, wherein the device for providing an admission pressure is a pressure accumulator having a variable volume.

4. Hydraulic system according to claim 1, wherein the device for providing an admission pressure is a second hydraulic pump connected to a hydraulic fluid reservoir and driven by a second electric motor.

5. (canceled)

6. (canceled)

7. Hydraulic system according to claim 1, wherein the first hydraulic pump is hydraulically connected with the first line via a first and a second 4/3-way valve to the rotary vane motor and the hydraulic cylinder in each case.

8. Hydraulic system according to claim 7, wherein the rotary vane motor and the hydraulic cylinder are hydraulically connected with a depressurization line via the first or the second 4/3-way valve to the first low-pressure circuit of the first hydraulic circuit.

9. Hydraulic system according to claim 7, wherein the first and/or second 4/3-way valves are electrically controlled.

10. Hydraulic system according to claim 1, wherein the rotary vane motor is a cylinder or a cylinder arrangement.

11. Hydraulic system according to claim 1, wherein a flow cooler is arranged in the first low-pressure circuit for cooling a hydraulic fluid in the first low-pressure circuit.

12. Hydraulic system according to claim 1, wherein the hydraulic cylinder is a hydraulic cylinder having a first and a second chamber.

13. Hydraulic system according to claim 12, wherein the second 4/3-way valve is hydraulically connected with a first connecting line to the first chamber of the hydraulic cylinder and with a second connecting line to the second chamber of the hydraulic cylinder.

14. Hydraulic system according to claim 13, wherein a check valve in each case for the leak-free blocking of the hydraulic cylinder is arranged in the first and second connecting lines.

15. Hydraulic system according to claim 1 and having a second hydraulic circuit comprising: a second low-pressure circuit and a second high-pressure circuit; a second device for providing an admission pressure in the second low-pressure circuit; a third hydraulic pump driven by a third electric motor and having two connections, wherein the third hydraulic pump is arranged in the second high-pressure circuit and is hydraulically connected to the rotary vane motor and/or the hydraulic cylinder; two second anti-cavitation valves separating the second low-pressure circuit from the second high-pressure circuit; and the second hydraulic circuit fluidically connected to the first hydraulic circuit.

16. Hydraulic system according to claim 15, wherein the first low-pressure circuit and the second low-pressure circuit are fluidically connected.

17. Hydraulic system according to claim 15, wherein the third electric motor is a variable-speed electric motor and the third hydraulic pump is a simple hydraulic pump, or the third electric motor is a constant-speed electric motor and the third hydraulic pump is a variable-volume hydraulic pump.

18. Hydraulic system according to claim 15, wherein the second device for providing an admission pressure is a pressure accumulator having a variable volume.

19. Hydraulic system according to claim 15, wherein the second device for providing an admission pressure is a fourth hydraulic pump that is connected to a hydraulic fluid reservoir and driven by a fourth electric motor.

20. Hydraulic system according to claim 15, wherein both connections of the third hydraulic pump are each fluidically connected via a check valve to the first line.

21. Hydraulic system according to claim 15, wherein a second flow cooler is arranged on the second low-pressure circuit.

22. Hydraulic system according to claim 11, wherein a first flow cooler is arranged on the first low-pressure circuit and the first flow cooler and the second flow cooler are one.

23. Hydraulic system according to claim 15, wherein the rotary vane motor and the hydraulic cylinder are hydraulically connected with a depressurization line to the first low-pressure circuit of the first hydraulic circuit and the depressurization line is hydraulically connected to the second low-pressure circuit of the second hydraulic circuit.

24. Method for operating a hydraulic system according to claim 1, wherein the rotary vane motor and/or the hydraulic cylinder are controlled and/or regulated by means of the first hydraulic circuit.

25. Method for operating a hydraulic system according to claim 15, wherein the rotary vane motor and/or the hydraulic cylinder are controlled and/or regulated by means of the second hydraulic circuit.

26. Method for operating a hydraulic system according to claim 15, wherein the rotary vane motor and/or the hydraulic cylinder are controlled and/or regulated by means of the first and/or the second hydraulic circuit.

27. Method for operating a hydraulic system according to claim 26, wherein the hydraulic system is of redundant design by means of the first and second hydraulic circuits.

Description

[0064] The following are shown:

[0065] FIG. 1 an exemplary embodiment according to the invention of a hydraulic system 1 of non-redundant design;

[0066] FIG. 2 a section of an exemplary embodiment according to the invention of a hydraulic system of non-redundant design;

[0067] FIG. 3 a further section of the exemplary embodiment according to the invention of FIG. 2;

[0068] FIG. 4 a section of a further exemplary embodiment according to the invention of a hydraulic system of redundant design;

[0069] FIG. 5 a further section of the exemplary embodiment according to the invention of FIG. 4;

[0070] FIG. 1 shows an exemplary embodiment according to the invention of the hydraulic system 1.

[0071] The hydraulic system 1 has a first hydraulic circuit 2a, which in turn comprises a low-pressure circuit 8a and a high-pressure circuit 9a.

[0072] A hydraulic fluid reservoir and in particular a pressure accumulator 52 is hydraulically connected via a flow cooler 42 to the low-pressure circuit.

[0073] The low-pressure circuit 8a is separated from the high-pressure circuit 9a by two anti-cavitation valves, which are shown in this drawing as check valves 14a, 16a.

[0074] Furthermore, a first hydraulic pump 21a driven by an electric motor 20a and having two connections is integrated in the high-pressure circuit 9a. In particular, this electric motor is a variable-speed electric motor 20a.

[0075] The hydraulic pump 21a has two connections, which are hydraulically connected to an actuator 100 via a respective 2/2-way valve 24a, 26a having a locking position, wherein the actuator 100 can be either a rotary vane motor 5 or a hydraulic cylinder 22.

[0076] FIG. 2 shows a section of an exemplary embodiment according to the invention of the hydraulic system 1. FIG. 3 a further section of the exemplary embodiment according to the invention of FIG. 2;

[0077] The lines in FIG. 2 are connected to the lines of FIG. 3 at the respective arrows X1 and Y1, along with A and B. The hydraulic system 1 comprises the combination of both sections of FIGS. 2 and 3.

[0078] As shown in FIG. 2, the hydraulic system 1 has a first hydraulic circuit 2a, which in turn comprises a low-pressure circuit 8a and a high-pressure circuit 9a.

[0079] The low-pressure circuit 8a has a second hydraulic pump 11a, which is driven by an electric motor 10a and hydraulically connected to an open tank 50 and which removes hydraulic fluid therefrom and feeds it into the low-pressure circuit 8a. Furthermore, the low-pressure circuit 8a has a drain line 40a, which is hydraulically connected via a flow cooler 42 to the open tank 50 and through which hydraulic fluid can flow into the tank 50.

[0080] The hydraulic fluid in the low-pressure circuit 8a is charged via the second hydraulic pump 11a to an admission pressure of approximately 20 bar, while the hydraulic fluid in the high-pressure circuit 9a can have a pressure of approximately 200 bar or more.

[0081] Accordingly, the low-pressure circuit 8a is separated from the high-pressure circuit 9a by two anti-cavitation valves, which are shown in this drawing as check valves 14a, 16a.

[0082] A first variable-speed electric motor 20a, with which the first hydraulic pump 21a is operated, is arranged in the high-pressure circuit 9a. The first hydraulic pump 21a has two connections, which are hydraulically connected to a rotary vane motor 5 via a respective 2/2-way valve 24a, 26a having a locking position. Thus, the rotary vane motor 5, which serves to adjust an angle of attack of the stabilizer wing 4, is controlled via the 2/2-way valves by the hydraulic pump 21a.

[0083] The two connections of the first hydraulic pump 21a are furthermore each hydraulically connected via a check valve 34a, 36a to a first line 72 (see FIG. 3).

[0084] As can be seen in FIG. 3, the first line 72 is connected via a 4/3-way valve 60 to the rotary vane motor of FIG. 2 (see arrows A and B in FIGS. 2 and 3) and via a 4/3-way valve 62 to a hydraulic cylinder 22, which controls the pivoting in and out of the stabilizer wing 4.

[0085] The 4/3-way valves 60 and 62 have a locking center position and are electrically controllable.

[0086] The connections of the 4/3-way valve 62 are hydraulically connected with a respective connecting line via a respective check valve 64, 66 to a respective one of the chambers of the hydraulic cylinder 22 and serve for the leak-free blocking of the hydraulic cylinder 22.

[0087] As can be seen in FIG. 3, a depressurization line 76 is connected to the two 4/3-way valves so that the hydraulic fluid flowing out of one of the chambers of the hydraulic cylinder 22 or out of the rotary vane motor 5 can flow via the depressurization line 76 into the low-pressure circuit 8a of FIG. 2 and, where applicable, through the outlet line 42a into the open tank 50 (see arrow Y1).

[0088] A check valve 78a is arranged in this depressurization line 76 upstream of the connection to the low-pressure circuit 8a, in order to regulate the pressure difference.

[0089] In comparison to the system of FIG. 2, the hydraulic system 1 of FIG. 4 has a further hydraulic circuit 2b, which has a second low-pressure circuit 8b and a second high-pressure circuit 9b.

[0090] The design of the second low-pressure circuit 8b is identical to the design of the first low-pressure circuit 8a, wherein identical devices are indicated by the same reference signs and a “b”.

[0091] The outlet line 42b is hydraulically connected via the flow cooler 42 to the open tank 50. The low-pressure circuit 8b is separated from the high-pressure circuit 9b via two check valves 14b and 16b.

[0092] The design of the second high-pressure circuit 9b also corresponds to that of the first high-pressure circuit 9a, wherein identical devices are indicated by the same reference signs and a “b”. The two connections of the third hydraulic pump 21b are also fluidically connected via two 2/2-way valves 24b and 26b to the rotary vane motor 5. Furthermore, the two connections of the third hydraulic pump 21b are hydraulically connected via two further check valves 34b and 36b to the line 72 of FIG. 5 (see arrows X2 and Y2).

[0093] The lines in FIG. 4 are connected to the lines of FIG. 5 at the respective arrows X1, Y1, X2, Y2 along with A and B. The hydraulic system 1 comprises the combination of both sections of FIGS. 4 and 5.

[0094] FIG. 4, together with FIG. 5, accordingly shows an exemplary embodiment according to the invention of a hydraulic system 1 of redundant design, in which the first and/or the second hydraulic circuit 2a, 2b control the hydraulic system 1.

[0095] In accordance with an exemplary embodiment, the hydraulic system 1 of redundant design of FIGS. 4 and 5 can be operated as follows:

[0096] The 2/2-way valves 24a, 26a, 24b, 26b are blocked in order to pivot the stabilizer wing out of the hull of the ship. The first hydraulic pump 21a and/or the third hydraulic pump 21b each control the rotary vane motor 5 and the hydraulic cylinder 22 with the first line 72 and via the 4/3-way valve 60 and the further 4/3-way valve 62. In this case, the 4/3-way valves 60 and 62 are opened so that a pivoting out of the stabilizer wing 4 and the angle of attack of the pivoting-out stabilizer wing 4 can be controlled (see FIG. 5).

[0097] When the stabilizer wing 4 is completely pivoted out, the 4/3-way valves 60 and 62 are closed and the angle of attack is controlled by means of the hydraulic pumps 21a and/or 21b and via the 2/2-way valves 24a, 26a, 24b, 26b (see FIG. 4).

[0098] In order to pivot the stabilizer wing in, the 2/2-way valves are closed again, and the first hydraulic pump 21a and/or the third hydraulic pump 21b operate again via the 4/3-way valves 60 and 62.

TABLE-US-00001 List of reference signs 1 Hydraulic system 2b Second hydraulic circuit 2a First hydraulic circuit 4 Stabilizer wing 5 Rotary vane motor 64, 66 Check valves 8a First low-pressure circuit 72 First line 8b Second low-pressure circuit 76 Depressurization line 9a First high-pressure circuit 100 Actuator (rotary vane motor 5 or 9b Second high-pressure circuit hydraulic cylinder 22) 10a Second electric motor 10b Fourth electric motor 11a Second hydraulic pump 11b Fourth hydraulic pump 14a, 14b Anti-cavitation valves 16a, 16b Anti-cavitation valves 20a First electric motor 20b Third electric motor 21a First hydraulic pump 21b Third hydraulic pump 22 Hydraulic cylinder 24a, 24b 2/2-way valves 26a, 26b 2/2-way valves 34a, 34b Check valves 36a, 36b Check valves 40a First outlet line 40b Second outlet line 42 Flow cooler 50 Tank 52 Pressure accumulator 60, 62 4/3-way valves