DE19806121C2 - Device for determining various pressure values in a rotating system - Google Patents

Description

The invention relates to a device for determining various pressures values on a rotor of a gas turbine, with several pressure transducers, continuously transfer their measured values to a stationary evaluation system be. The known prior art is based on the DE 38 44 565 A1 referenced.

High demands are made on pressure measurement technology, for example in gas turbines changes, especially if in the course of development work a large number of pressure values measured in or on the rotor of the gas turbine Need to become. As pure as possible and exactly then a lot must be number of different pressure values continuously over a longer period from the rotating system to a station provided in a test bench res evaluation system.

Since the known systems usually require a lot of instrumentation represent and mostly not suitable for high rotational speeds  are, the invention has set itself the task of a reliable simple Measuring system or a device for determining various pressure values according to claim 1.

The solution to this problem is characterized by the combination of the following features:

• Integrated multi-plexed pressure transducers are used,
• - An address provided on the rotor and thus in the rotating system siermodul controls the pressure transducers,
• - Between the rotor and thus the rotating system and the sta tional evaluation system both the respective signals as also transmit the required energy via telemetry,
• - To compensate for temperature effects, the temperature of the Pressure transducer measured and transmitted telemetrically,
• - The pressure sensors determine a differential pressure against one known reference pressure, and are therefore as exactly working Diff differential pressure transducer,
• - The pressure transducers sit in or near the axis of rotation of the Ro tors (i.e. the rotating system R).

For a more detailed explanation of the invention, reference is made to the attached schematic diagram referenced the individual elements of a Vorrich invention tung shows abstract.

To the left of the dividing line designated by reference number 1 is the so-called rotating system R, which can in particular be a rotor of a gas turbine. To the right of this dividing line 1 is the stationary evaluation system S. The latter consists of an evaluation station 2 and a stationary telemetry coil system 3 a, which in addition to an energy supply unit (“power supply”) 4, two signal receivers (“receivers”) 5 contains.

A with the stationary telemetry coil system 3 a corresponding rotating telemetry coil system 3 b is seen in the rotating system R. This rotating telemetry coil system 3 b can be flanged directly onto the rotor of the gas turbine, for example. The energy supply unit 4 a of the stationary system 3 a is assigned an energy supply unit 4 b (also called “power supply”) in the rotating telemetry coil system 3 b. In the same way, the two signal receivers 5 a in the stationary system 3 a are assigned two signal transmitters 5 b, the first of which is referred to as a "temp. Measurement module" and the second as a "strain gage module" is.

In the rotating system R there is a large number of pressure sensors ("scanners") 6 , to which the pressures recorded at pressure measuring points (not shown) are fed via pressure measuring lines 7 . In this one integrated pressure transducers 6 (scanner) is a pressure measuring 7 a reference pressure "Ref." initiated so that the individual Druckauf participants 6 can be designed as a precisely working differential pressure transducer.

The pressure transducers 6 are multiplexed in order to be able to transmit their measurement signals, as will be explained briefly later, to the evaluation station 2 by telemetry. For this purpose, the pressure transducers 6 are controlled accordingly by an addressing module 8 . For this purpose, this addressing module 8 receives correspondingly triggered signals from the energy supply unit 4 b of the rotating telemetry coil system 3 b. Also from this energy supply unit 4 b, the pressure transducers 6 are supplied with the required energy via a voltage converter 9 '.

About a further voltage converter ("Voltage Converter") 9 ", the measurement signals of the pressure transducers - these are designated with" Vout "- the signal transmitter 5 b (" Strain Gage Module ") in the rotating telemetry coil system 3 b The current temperature is determined by means of a temperature sensor (not shown) in the area of the pressure transducer 6 in order to be able to compensate for any temperature effects that may occur.This temperature measured value is fed to the second signal transmitter 5 b referred to as the “temp.

As already mentioned, the two signal transmitters 5 b are used to transmit the signals or data by telemetry into the stationary telemetry coil system 3 a or into the corresponding signal receiver 5 a thereof. From here, these data are forwarded to the evaluation station 2 , which, in the rest, triggers the energy supply unit 4 a in accordance with the requirements in order to have the respective measured values successively transmitted as desired.

In summary, pressure transducers 6 with a multi-plexed output are used to determine various pressure values in a rotating system. For example, three 16-channel recorders can be used, ie 16 pressure signals are each multiplexed on an analog output. This multi-plexed output is transmitted via telemetry. To control the multiplexer, special control signals are transmitted to the rotating system R via the telemetry coil system 3 a, 3 b. A special addressing module 8 converts the control signals into address codes, which are supplied to the pressure transducers 6 as analog voltages. As a result, the possible number of print parameters to be transmitted is very large (as mentioned here, there are 48 parameters). Telemetry ensures reliable signal transmission.

The pressure transducers are preferably in the rotating system R or in the Integrated rotor shaft of the same that the associated pressure membranes na so lie in the central axis of the rotor (not shown). This can disruptive centrifugal effects are minimized. Furthermore, there is a high one  Measuring accuracy through the described differential pressure measurement over the Reference pressure "Ref.", Which is based on the pressure level to be measured can be fitted.

Reference list

1

parting line

2nd

Evaluation station

3rd

a stationary telemetry coil system

3rd

b rotating telemetry coil system

4

a power supply unit

4

b Power supply unit

5

a Signal receiver ("Receiver")

5

b Signal transmitter

6

Pressure sensor ("scanner")

7

Pressure measuring line

8th

Addressing module

9

',

9

"Voltage Converter"
R rotating system
S stationary evaluation system
Ref. Reference pressure

Claims (1)

1.Device for determining various pressure values on a rotor (rotating system R) of a gas turbine, with several pressure transducers ( 6 ), the measured values of which are continuously transferred to a stationary evaluation system (S), characterized by the combination of the following features:

• integrated multi-plexed pressure transducers ( 6 ) are used,
• - An address module ( 8 ) provided on the rotor and thus in the rotating system (R) controls the pressure transducers ( 6 ),
• - Between the rotor and thus the rotating system (R) and the stationary evaluation system (S), both the respective signals and the required energy are transmitted by telemetry,
• - To compensate for temperature effects, the temperature of the pressure transducers ( 6 ) is measured and transmitted telemetrically,
• - The pressure transducers ( 6 ) determine a differential pressure compared to a known reference pressure (Ref.), and are thus designed as a precisely working differential pressure transducer,
• - The pressure transducers ( 6 ) sit in or near the axis of rotation of the rotor (rotating system R).