Measuring instrument of the pressure in a combustor

• US 20030051553A1
• Filed: 08/08/2002
• Published: 03/20/2003
• Est. Priority Date: 08/27/2001
• Status: Active Grant

• Current Assignee: Mitsubishi Heavy Industries, Ltd.
• Original Assignee: Mitsubishi Heavy Industries, Ltd.
• Inventors: Matsuyama, Keisuke, Tanaka, Katsunori
• Granted Patent: US 6,880,391 B2
• Time in Patent Office: Days
• US Class Current: 73/708
• CPC Class Codes: F01D 17/08 responsive to condition of working-fluid, e.g. pressure
• CPC Class Codes: G01L 19/0007 Fluidic connecting means
• CPC Class Codes: G01L 19/0609 Pressure pulsation damping arrangements

Abstract

The present invention aims, in a measuring instrument of the pressure in a combustor using a pressure conduit and damping tube and being composed so that a pressure sensor is provided at a location with some distance from the combustion gas in the combustor by way of the pressure conduit, to prevent condensation of the moisture in the damping tube and make it possible to measure the pressure in the combustor always accurately.

For the purpose, the invention proposes an instrument for measuring the pressure in a combustor having a pressure conduit inserted into the combustor; a pressure sensor for measuring the pressure in the combustor, the sensor being provided at the base end side of the pressure conduit; and a damping tube for absorbing the resonance produced in the pressure conduit in accordance with the acoustic eigenvalue of the pressure conduit, the damping tube also being provided at the base end side of the conduit; in which said pressure sensor is located at a position where the temperature is elevated by the heat from the combustor to a temperature equal to or above the boiling point of water at the concerned gas pressure, said damping tube is wound around said pressure sensor or pressure conduit (including the outer and inner surface of the conduit) for preventing condensation of the moisture in the damping tube, and further heat-resisting, sound-absorbing material is provided in the pressure conduit.

Claims

1. A measuring instrument of the pressure in a combustor, the instrument having a pressure conduit inserted into the combustor, a pressure sensor mounted to the base end side of the pressure conduit for measuring by way of the pressure conduit the gas pressure in the combustor, and a damping tube mounted to the base end side of the pressure conduit for absorbing the resonance produced in accordance with the acoustic eigenvalue of the pressure conduit, wherein

said pressure sensor is located at the position where the temperature is elevated by the heat from the combustor to equal to or above that of the boiling point of water at the pressure of the gas from the combustor, and

said damping tube is provided extending around or in the direction of axis of at least one of said pressure sensor and/or pressure conduit contacting with the surface thereof to prevent condensation of moisture in the damping tube.

2. A measuring instrument of the pressure in a combustor according to claim 1, wherein said damping tube is wound inside or outside of at least one of the pressure sensor and/or the pressure conduit.

3. A measuring instrument of the pressure in a combustor according to claim 1 or 2, wherein a sound-absorbing material is provided in the pressure conduit for absorbing the resonance produced in accordance with the acoustic eigenvalue of the pressure conduit.

4. A measuring instrument of the pressure in a combustor according to claim 1 or 2, wherein a plurality of sound-absorbing materials each having the property of absorbing different frequency level are provided in the pressure conduit for absorbing the resonance produced in accordance with the acoustic eigenvalue of the pressure conduit.

5. A measuring instrument of the pressure in a combustor according to claim 1 or 2, wherein a drain valve is provided at the free end of the damping tube for making it possible to drain the water condensed in the damping tube.

6. A measuring instrument of the pressure in a combustor according to claim 1 or 2, wherein said damping tube is composed of a plurality of narrow tubes bundled together and inserted into the pressure conduit to prevent condensation of the moisture in the damping tube.

7. A measuring instrument of the pressure in a combustor, the instrument having a pressure conduit inserted into the combustor, and a pressure sensor mounted to the base end side of the pressure conduit for measuring the gas pressure in the combustor, wherein

said pressure conduit is composed of narrow pressure tubes bundled together to allow the pressure conduit itself to have a damping effect.