Hydraulic adjusting device

Patent metadata

Field	Value
Publication number	US-9803657-B2
Application number	US-201314409580-A
Country	US
Kind code	B2
Filing date	May 31, 2013
Priority date	Jun 20, 2012
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A hydraulic adjusting device, in particular for use in a power plant and/or a wind power plant, includes a double-acting adjusting cylinder that has an adjusting function for a working operation and for a special operation. The double-acting adjusting cylinder is configured to be pressurized with a working pressure medium. In order to satisfy the adjusting function in the special operation, the double-acting adjusting cylinder is further configured to be connected to a pressure medium reservoir that has a pressurized gas isolated from the working pressure medium. The adjusting cylinder has a working chamber configured for the adjusting function of the special operation, the piston area of which is coupled to a piston arrangement of the adjusting cylinder that is configured for the working operation or is configured to be coupled to the piston arrangement.

First claim

The invention claimed is:

1. A hydraulic adjusting device for use in an energy or process engineering installation, comprising:
an adjusting cylinder having a piston arrangement with two piston surfaces that are effective in opposite directions, wherein a first working space is delimited via a first of the two piston surfaces and a second working space is delimited via a second of the two piston surfaces, and wherein the two working spaces are acted upon with a working pressure medium;
a pressure medium accumulator that is connectable to the adjusting cylinder and contains a compressed gas that is separate from the working pressure medium; and
a compressor device arranged partially in the adjusting cylinder or arranged outside the adjusting cylinder,
wherein the adjusting cylinder has a third working space that is delimited via a third piston surface and is configured to be acted upon with the compressed gas, and
wherein the third piston surface is configured to be coupled to the piston arrangement.

2. The adjusting device as claimed in claim 1 , wherein the third working space is configured to be acted upon with the compressed gas as a function of a control signal or a measuring signal.

3. The adjusting device as claimed in claim 1 , further comprising a hydraulic machine having a first pressure medium connection and a second pressure medium connection, wherein the first working space is connectable to the first pressure medium connection and the second working space is connectable to the second pressure medium connection.

4. The adjusting device as claimed in claim 3 , further comprising an electric motor operatively coupled to the hydraulic machine.

5. The adjusting device as claimed in claim 3 , further comprising a bypass directional control valve that has at least one actuated position and a non-actuated position, wherein, in the non-actuated position, the bypass directional control valve connects the first working space to the second working space, bypassing the hydraulic machine.

6. The adjusting device as claimed in claim 3 , wherein the compressor device is arranged partially in the adjusting cylinder and has an auxiliary piston on which the couplable third piston surface is arranged.

7. The adjusting device as claimed in claim 6 , wherein a fourth piston surface that is effective in the opposite direction to the third piston surface is arranged on the auxiliary piston, wherein a fourth working space of the adjusting cylinder is delimited at least in sections via the auxiliary piston, the fourth working space being connectable to one or more of one of the pressure medium connections of the hydraulic machine and a hydraulic accumulator containing the working pressure medium.

8. The adjusting device as claimed in claim 1 , further comprising a shutoff valve that has at least one actuated locking position and a non-actuated position, wherein, in the non-actuated position, the shutoff valve connects the pressure medium accumulator to the third working space.

9. The adjusting device as claimed in claim 1 , wherein the first piston surface and the second piston surface are approximately identical in size.

10. The adjusting device as claimed in claim 1 , wherein the first working space and the second working space are arranged in tandem in a longitudinal direction of the adjusting cylinder.

11. The adjusting device as claimed in claim 1 , wherein the first piston surface and the second piston surface are arranged facing away from each other.

12. The adjusting device as claimed in claim 1 , wherein the third piston surface is formed on a piston rod of the piston arrangement.

13. The adjusting device as claimed in claim 1 , wherein each of the first, second, and third working spaces is delimited radially at least partially via a housing of the adjusting cylinder.

14. The adjusting device as claimed in claim 1 , wherein the first working space is arranged concentrically with respect to the second working space.

Assignees

• Bosch Gmbh Robert

Inventors

• Froehlich Udo
• Krug Sebastian
• Doertoluk Ibrahim

Classifications

• F15B2211/8752

  Emergency operation mode, e.g. fail-safe operation mode · CPC title

• F15B2211/7054

  Having equal piston areas · CPC title

• F15B2211/7055

  having more than two chambers · CPC title

• F15B20/002

  Electrical failure · CPC title

• F15B11/072 Primary

  Combined pneumatic-hydraulic systems (F15B11/032 takes precedence) · CPC title