Power plants – Combustion products used as motive fluid – With safety device
Patent
1997-11-17
1999-09-21
Casaregola, Louis J.
Power plants
Combustion products used as motive fluid
With safety device
60734, F02C 926
Patent
active
059539011
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to a mechanical shut-off system in the fuel supply system of a gas turbine, having a shut-off valve body which, by means of a spring, can be brought into a position interrupting a fuel line. The system further has a mechanism which, in the normal operation of the gas turbine holds the shut-off valve body in a position releasing the fuel line and releases the shut-off valve body in the event of damage or breakage of a structural element of the gas turbine. Such a mechanically operated shut-off system which, for example, in the event of a breakage of a gas turbine shaft, abruptly interrupts the fuel supply system of the gas turbine, according to existing regulations, must be provided, for example, on a flight gas turbine, and is known from British Patent Document GB-A-903 945 or U.S. Patent Document U.S. Pat. No. 3,050,939.
It is sometimes difficult to arrange these known shut-off systems, such that on a gas turbine, in the event of all possible damage cases or breaks on important structural components of the gas turbine, a secure interruption of the fuel supply takes place. The reason is that the corresponding mechanism which releases the shut-off valve body in the event of damage must definitely be impacted by the broken or damaged component.
In view of the above, it is an object of the present invention to provide a simple and reliable mechanical shut-off system. For achieving this object, it is provided that the mechanism is constructed as a shear-type (scissor-type) mechanism acted upon by a spring, which shear-type mechanism comprises an arm which is constructed such that, in the event of damage or a break of a structural element of the gas turbine, it is acted upon so that it releases the shut-off valve body.
BRIEF DESCRIPTION OF THE DRAWING
The FIGURE is a schematic diagram of the mechanical shut-off system according to the present invention.
DETAILED DESCRIPTION OF THE DRAWING
Referring to the schematic diagram, reference number 1 indicates a housing in which a shut-off valve body 3 is guided in a longitudinally slidable manner according to the direction of the arrow 2. If this shut-off valve body 3 is in the illustrated position, a fuel line 4 which penetrates the housing 1 transversely to the direction of the arrow 2 is not interrupted whereas this fuel line 4 is interrupted when the shut-off valve body 3 has moved to the right and comes to rest with its center section 3' in the area of this fuel line 4-in this position, the shut-off valve body 3 is illustrated by thin lines. In the position of the shut-off valve body 3 illustrated by thick lines, fuel can therefore reach, by way of the fuel line 4, the combustion chamber of the gas turbine, which is not shown. In contrast, if the shut-off valve body 3 comes to rest farther on the right in the area of the fuel line 4, the fuel supply to the combustion chamber of the gas turbine is interrupted because the fuel line 4 will then be shut off.
By way of a traction rope 5' (cable) as well as an adjoining threaded rod 5, a pressure spring 6 (which is also supported on the housing 1) is applied to the shut-off valve body 3 and seeks to move the shut-off valve body 3 toward the right according to the direction of the arrow 2. In this case, the force of the pressure spring 6 can be preadjusted by using an adjusting nut 7 interacting with the threaded rod 5 so that, when there are no counterforces, the shut-off valve body 3 is brought into the position shutting-off/blocking the fuel line 4.
While the described pressure spring 6 is applied to the right side of the shut-off valve body 3, a shear-type mechanism is applied to the left side of the shut-off valve body 3. As a whole, the shear-type mechanism has the reference number 8. At first, the shear-type mechanism holds the shut-off valve body 3 in the position illustrated by thick lines. With respect to details, this shear-type mechanism 8 is formed by two arms 9a, 9b, in which case arm 9a is linked in a stationary manner and arm 9b can be
REFERENCES:
patent: 437877 (1890-10-01), Traux
patent: 2476635 (1949-07-01), Southwick
patent: 2930188 (1960-03-01), Haworth et al.
patent: 3050939 (1962-08-01), Morley
BMW Rolls-Royce GmbH
Casaregola Louis J.
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