JPH05346227A - Flame monitoring probe - Google Patents

Abstract

(57) [Abstract] [Purpose] To effectively suppress the temperature rise of the borescope that constitutes the flame monitoring probe. An air supply channel 27 formed between a borescope 4 and an internal protection tube 19 including the borescope 4.
Cooling air is continuously circulated through the cooling water supply passage 24, and a cooling water supply passage 24 and a cooling water communication passage 2 are formed between the inner protection pipe 19 and the outer protection pipe 18 including the inner protection pipe 19.
6. The cooling water is continuously circulated in the cooling water recovery passage 25 to effectively suppress the temperature rise of the borescope 4. Further, the air supplied to the air supply channel 27 is
Since it is blown from the groove 33 to the surface of the observation window body 32 through the air communication hole 28, the chamber 35, and the air injection hole 34, the observation window body 32 is effectively cooled, and
The substance generated by the generation of the flame does not adhere to the surface of the observation window body 32, and the light transmittance does not decrease.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to flame monitoring probes.

[0002]

2. Description of the Related Art FIGS. 6 and 7 show Japanese Patent Laid-Open No. 63-15063.
4 shows a flame monitoring probe used in the gas turbine combustor flame monitoring device disclosed in Japanese Patent Publication No.
Side is closed and the other end B is open, and a substantially cylindrical fiberscope fixed tube 2 is the other end B of the fiberscope fixed tube 1.
The fiberscope 3 inserted and locked from the side opening into the inside of the fiberscope fixing tube 1 is an observation hole formed in the vicinity of one end A side of the fiberscope fixing tube 1.
The fiberscope fixing tube 1 and the fiberscope 2 constitute a borescope 4.

Reference numeral 10 denotes an air-cooling pipe having a double structure. The air-cooling pipe 10 has a substantially cylindrical external protection pipe 5 having one end A side closed and the other end B side opened, and one end A side closed and the other end B side closed. The external protection tube 5 is opened and opened from the opening on the other end B side of the external protection tube 5.
It is constituted by an inner protective tube 7 which is loosely fitted and locked inside.

Reference numeral 6 denotes a window fixing pipe mounting hole which is provided in the vicinity of one end A side of the external protection pipe 5 and opens laterally from the inside of the external protection pipe 5, and 8 is provided in the vicinity of one end A side of the internal protection pipe 7. From the inside of the internal protection tube 7 to the side, the window fixing tube mounting hole 6
A window fixing pipe mounting hole that is open substantially concentrically with 9 is an air flow passage formed between the inner portion of the outer protective pipe 5 and the outer portion of the inner protective pipe 7.

The borescope 4 is inserted into the inner protective tube 7 so that the lens portion 36 faces the center of the window fixing tube mounting hole 8.

Reference numeral 11 is a substantially annular window fixing tube inserted and locked in the window fixing tube mounting holes 6 and 8, and 12 is the window fixing tube 11
The observation window main body 13 made of heat-resistant glass fitted in is fixed to the window fixing tube 11 and fixed to the window fixing tube 11 to fix the observation window main body 12 to the window fixing tube 11.

Reference numeral 14 denotes an air circulation hole that penetrates the window fixing pipe 11 in the radial direction and communicates with the air flow passage 9. Reference numeral 15 denotes the push screw fitting 13 in the radial direction from the air circulation hole 14 to the observation window body 12. Reference numeral 16 denotes an air injection hole penetrating to the surface side of the push screw fitting 13 and is a groove provided in the push screw fitting 13 for screwing the push screw fitting 13 into the window fixing pipe 11 by a dedicated screwdriver.

FIG. 8 shows a state in which flame monitoring of the gas turbine combustor 37 is carried out by the flame monitoring probe (shown by P in FIG. 8) having the above-mentioned configuration, in which 38 is a combustor casing and 39 is a combustor. A mixer disposed in the casing 38 for mixing the air flow S and the fuel F, the combustor casing 38 being disposed at a rear side of the mixer 39.
It is a flame stabilizer placed inside.

When the flame monitoring probe P is used to monitor the flame of the gas turbine combustor 37, the tip of the flame monitoring probe P is inserted into the combustor casing 38, and the fiberscope 2 is connected to the fiber cable 41. A television camera 42 installed outside the combustor casing 38 is connected to the television camera 42. A television monitor 43 is connected to the television camera 42, and cooling air is continuously supplied to the air passage 9.

The air supplied to the air passage 9 is blown onto the surface of the observation window body 12 from the air injection hole 15 through the air circulation hole 14.

In this state, a flame H is generated in the combustor casing 38, and the brightness, hue,
Shapes such as fiberscope 2 and fiber cable 4
1. The image is displayed on the TV monitor 43 via the TV camera 42, and the flame H is visually observed outside the combustor casing 38.

At this time, since the cooling air is continuously circulated in the air passage 9, the heat of the flame is difficult to be transmitted to the borescope 4, so that the borescope 4 is not adversely affected by the heat. .

Further, as described above, since the cooling air is continuously blown to the surface of the observation window main body 12, the observation window main body 12 is effectively cooled and the surface of the observation window main body 12 is flamed. The substance generated due to the occurrence of is not attached, and the light transmittance does not decrease.

[0014]

However, when observing the flame of the afterburner used in the gas turbine engine for an aircraft, the temperature of the flame reaches 1800 ° C. and the turbulence is generated in the flame. Temperature is 200
Since the temperature rises to about 0 ° C., the flame monitoring probe shown in FIGS. 6 and 7 lacks cooling capacity, and the borescope 4 is adversely affected by heat.

The present invention has been made in view of the above situation, and an object thereof is to effectively suppress the temperature rise of the borescope constituting the flame monitoring probe.

[0016]

In order to achieve the above object, in a flame monitoring probe of the present invention, a borescope having a fiberscope incorporated therein and an observation hole provided so as to face the lens portion of the fiberscope. And an inner protection tube that includes the borescope and forms an air supply flow path between the borescope and the borescope, and includes a portion other than the vicinity of the observation hole of the inner protection tube and near the observation hole of the inner protection tube An external protection tube having a cooling water flow passage formed between the observation window body and a portion other than the above, an observation window main body made of a heat-resistant transparent member provided in the observation hole, and from the air supply channel to the vicinity of the surface peripheral portion of the observation window main body And an air flow passage extending therethrough.

[0017]

When performing flame monitoring, cooling water is continuously circulated in the cooling water flow passage, and cooling air is continuously supplied to the air supply passage.

The air supplied to the air supply passage is blown onto the surface of the observation window body through the air flow passage.

In this state, the tip of the flame monitoring probe is inserted into the casing of a combustor such as an afterburner to generate a flame, and the brightness, hue, shape, etc. of the flame are observed with a borescope.

In the flame monitoring probe of the present invention, the cooling water is continuously circulated in the cooling water flow passage, and at the same time,
Since the cooling air is continuously circulated in the air supply passage, the temperature rise of the borescope can be effectively suppressed, and the borescope may be adversely affected by heat due to insufficient cooling capacity. Absent.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 5 show an embodiment of the flame monitoring probe of the present invention. In the drawings, the parts designated by the same reference numerals as those in FIGS. 6 and 7 represent the same parts.

Reference numeral 4 denotes a borescope composed of a fiberscope fixed tube 1 and a fiberscope 2, and 17
The external protective tube 18 has a hollow structure in which one end A side is closed and the other end B side is opened.
This is a cooling pipe having a double pipe structure constituted by a hollow internal protection tube 19 loosely fitted and locked inside, and the outer protection tube 18 and the internal protection tube 19 have a planar shape of forward C at the tip. The side surface is formed to be substantially flat, and the other portions are formed to be substantially circular.

Reference numeral 20 denotes a cap mounting hole which is provided near the one end A side of the outer protective tube 18 and which opens laterally from the inside of the outer protective tube 18, and 21 denotes a cap mounting side from the inner side of the inner protective tube 19. An observation hole that opens approximately concentrically with the hole 20,
Reference numeral 22 denotes a substantially annular protrusion that protrudes from the peripheral edge of the cap mounting hole 20 toward the inside of the outer protective tube 18 and contacts the outer side of the inner protective tube 19, and the inner peripheral portion of the cap mounting hole 20. Is provided with a female screw.

The borescope 4 is loosely fitted in the internal protection tube 19 which constitutes the cooling tube 17 so that the lens portion 36 faces substantially the center of the observation hole 21.

Reference numeral 27 denotes an air supply passage formed between the outer portion of the borescope 4 and the inner portion of the inner protective tube 19, 28
The inner protection tube 1 so that it is located inside the protrusion 22.
9 is an air communication hole that opens from the inside to the side, and a plurality of air communication holes 28 are provided along the inner side of the protrusion 22.

23 extends along the outer surface of the inner protection tube 19 from one end A side end to the other end B side end, and extends in the space between the inner portion of the outer protection tube 18 and the outer portion of the inner protection tube 19 back and forth. A partition plate, which is divided into two parts, and 24 is an inner part of the external protection tube 18,
The outer side of the inner protection tube 19, the protrusion 22, and the partition plate 23
And a surface on the front C side of the cooling water supply channel, 2
Reference numeral 5 denotes a cooling water recovery channel formed by the inner portion of the outer protective tube 18, the outer portion of the inner protective tube 19, and the rear D-side surface of the partition plate 23, and 26 denotes the inner portion of the outer protective tube 18. A cooling water communication channel formed by a bottom portion and an outer bottom portion of the internal protection pipe 19 and connecting the cooling water supply channel 24 and the cooling water recovery channel 25 to the end A side.

29 is a substantially annular screwing portion 30 having a male screw on the outer peripheral portion formed on the front C side, and has the cap mounting hole 20.
The observation window main body 32 made of heat-resistant glass is fitted in a substantially annular holding portion 31 that is screwed to the female screw of The cap 35 is formed by the front C-side surface of the internal protective tube 19, the inner peripheral portion of the protrusion 22, the rear D-side surface of the screwing portion 30, and the outer peripheral portion of the holding portion 31. The chamber 35 is a substantially annular chamber, and the chamber 35 communicates with the air supply passage 27 through the air communication hole 28, and the rear D side surface of the observation window body 32 is the front C side of the internal protective tube 19. Is in close contact with the surface.

Reference numeral 33 denotes a plurality of grooves extending in the radial direction of the screwing portion 30 formed in a portion of the surface of the screwing portion 30 on the rear D side surrounded by the holding portion 31, and 34 denotes a diameter of the holding portion 31. And a plurality of air injection holes that penetrate the chamber 35 and the groove 33 to communicate with each other.

When the flame monitoring probe having the above-described structure is used to monitor the flame, the tip of the flame monitoring probe is inserted into the casing of the combustor such as an afterburner, and the cooling water is supplied to the cooling water supply passage 24. Further, cooling air is continuously supplied to the air supply passage 27.

The cooling water supplied to the cooling water supply flow path 24 flows into the cooling water recovery flow path 25 via the cooling water communication flow path 26, and further through the cooling water recovery flow path 25 to the outside of the cooling pipe 17. Outflow to.

On the other hand, the air supplied to the air supply passage 27 is blown from the groove 33 to the surface of the observation window body 32 through the air communication hole 28, the chamber 35 and the air injection hole 34.

In this state, a flame is generated in the casing of the combustor such as the afterburner, and the brightness of the flame,
The hue, shape, etc. are observed by the borescope 4.

At this time, in the flame monitoring probe of this embodiment, the cooling water supply passage 24, the cooling water communication passage 26,
Since the cooling water continuously flows through the cooling water recovery passage 25 and the cooling air continuously flows through the air supply passage 27, the temperature rise of the borescope 4 can be effectively increased. Therefore, the borescope 4 is not adversely affected by heat due to insufficient cooling capacity.

Further, like the conventional flame monitoring probe,
Since cooling air is continuously blown to the surface of the observation window body 32, the observation window body 32 is effectively cooled, and at the same time, the substances generated by the generation of the flame on the surface of the observation window body 32 are It does not adhere and the light transmittance does not decrease.

The flame monitoring probe of the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0037]

As described above, the flame monitoring probe of the present invention can exhibit various excellent effects as described below.

(1) Cooling air is circulated in an air supply passage between the borescope and the internal protection pipe, and cooling water is circulated in a cooling water flow passage between the internal protection pipe and the external protection pipe. Therefore, the temperature rise of the borescope can be effectively suppressed, and the borescope is not adversely affected by heat due to insufficient cooling capacity.

(2) Since the temperature rise of the borescope is effectively suppressed, it becomes possible to directly insert the flame monitoring probe into the afterburner duct used for the gas turbine engine for aviation, and to observe and monitor the flame in the afterburner. Can be done easily.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a flame monitoring probe of the present invention.

2 is a view taken along the line II-II of FIG.

FIG. 3 is a view on arrow III-III in FIG.

FIG. 4 is a front view of the cap shown in FIG.

5 is a rear view of the cap shown in FIG. 1. FIG.

FIG. 6 is a cross-sectional view showing an example of a conventional flame monitoring probe.

FIG. 7 is a front view showing an example of a conventional flame monitoring probe.

FIG. 8 is a conceptual diagram showing a state in which flame monitoring of a gas turbine combustor is performed by a conventional flame monitoring probe.

[Explanation of symbols]

 2 Fiberscope 4 Borescope 18 External protection tube 19 Internal protection tube 21 Observation hole 24 Cooling water supply flow path (cooling water flow passage) 25 Cooling water recovery flow path (cooling water flow path) 26 Cooling water communication flow path (cooling water flow path) 27 Air Supply Flow Path 28 Air Communication Hole (Air Flow Path) 32 Observation Window Main Body 33 Groove (Air Flow Path) 34 Air Injection Hole (Air Flow Path) 35 Chamber (Air Flow Path) 36 Lens Part

Claims (1)

[Claims] 1. An air supply flow path including a borescope having a fiberscope therein and an observation hole provided so as to face a lens portion of the fiberscope, and including the borescope and between the borescope and the borescope. And an external protection tube that includes a portion other than the vicinity of the observation hole of the internal protection tube and forms a cooling water flow path between the internal protection tube and a portion of the internal protection tube other than near the observation hole, and the observation. A flame monitoring probe comprising: an observation window main body made of a heat-resistant transparent member provided in a hole; and an air flow passage extending from the air supply flow path to a vicinity of a peripheral portion of a surface of the observation window main body.