JP5485049B2 - Pressure tube mounting structure - Google Patents

Description

  The present invention relates to one end of a pressure tube that leads a working fluid in a casing (for example, compressed air when the casing constitutes a compressor and combustion gas when the casing constitutes a turbine) to a pressure sensor. The present invention relates to a mounting structure of a pressure tube to be attached to a surface.

  As a mounting structure of a pipe (pressure tube) for performing a pressure test such as a pressure test or a leak test of a pressure vessel, for example, a structure disclosed in Patent Document 1 is known.

JP 59-154394 A

  Further, the pressure sensor detects compressed air in a compressor casing constituting an aircraft gas turbine (for example, a turboshaft engine) or combustion gas in a turbine casing constituting an aircraft gas turbine (for example, a turboshaft engine). As a pressure tube mounting structure for mounting one end portion of the pressure tube led to the outer surface of the casing, for example, those shown in FIGS. 9 and 10 are known.

  A pressure tube mounting structure 90 shown in FIG. 9 includes a joint 92 having a tapered male screw portion 91 formed at the tip thereof, a casing (when the casing constitutes a compressor, the casing of the compressor, and the casing constitutes a turbine. In this case, one end of the pressure tube 95 is attached (fixed) to the outer surface of the casing 93 by screwing into a tapered female threaded portion 94 formed on the outer surface of the casing 93 of the turbine.

On the other hand, the pressure tube mounting structure 100 shown in FIG. 10 has an end portion of the pressure tube 101 as a casing (a casing of a compressor when the casing constitutes a compressor, and a casing of a turbine when the casing constitutes a turbine). It is inserted into a recess 103 formed on the outer surface of 102, and one end of the pressure tube 101 is attached (fixed) to the outer surface of the casing 102 by brazing (or TIG welding or adhesive).
In addition, the code | symbol 104 in FIG. 10 has shown the brazing part (or welding part or adhesive agent).

  However, the pressure tube mounting structure 90 shown in FIG. 9 and the pressure tube mounting structure 100 shown in FIG. 10 have a sufficient thickness of the casings 93 and 102, that is, a tapered female thread portion on the outer surface of the casing. 94 can be formed, the case where the casing does not deform due to heat generated during brazing (or TIG welding), or the depth of the recess for receiving one end of the pressure tube is sufficiently secured. And can be employed when one end of the pressure tube can be securely fixed with an adhesive, and the casing of the compressor constituting the aircraft gas turbine (e.g., turboshaft engine). And thin casings such as turbine casings that make up aircraft gas turbines (e.g., turboshaft engines). In the case of singing, that is, when the tapered female thread portion 94 cannot be formed on the outer surface of the casing, or when the casing is deformed by heat generated during brazing (or TIG welding), Alternatively, the depth of the recess that accepts one end of the pressure tube cannot be sufficiently secured, and cannot be employed when the one end of the pressure tube cannot be securely fixed with an adhesive. was there.

  The present invention has been made in view of such circumstances, and includes a compressor casing and an aircraft gas turbine (for example, a turboshaft engine) constituting an aircraft gas turbine (for example, a turboshaft engine). It is an object of the present invention to provide a pressure tube mounting structure that can be applied to a thin-walled casing such as a turbine casing.

The present invention employs the following means in order to solve the above problems.
The pressure tube mounting structure according to the present invention is a pressure tube mounting structure in which one end of a pressure tube that guides the working fluid in the casing to the pressure sensor is mounted on the outer surface of the casing, and gradually expands toward the one end. A pressure tube having a tapered portion provided at one end, a recess provided on the outer surface of the casing to receive the tapered portion, an inner peripheral surface of the recess, and an outer peripheral surface of the tapered portion; And an adhesive filled in the recess.

According to the pressure tube mounting structure of the present invention, a tapered portion that gradually increases in diameter toward one end is provided at one end portion of the pressure tube that is attached to the casing, and the tapered portion is formed on the outer surface of the casing. It is stored in the formed recess and is fixed to the outer surface of the casing by the adhesive filled in the recess. Moreover, by making one end part of a pressure tube into a taper part, the depth of a recessed part becomes small and the contact area of a taper part and an adhesive agent becomes large.
Thus, without providing a tapered female thread portion on the outer surface of the casing, and without deforming the casing by heat generated during brazing or TIG welding, the one end portion of the pressure tube is connected to an aircraft gas turbine. It can be securely fixed to the outer surface of a thin casing such as a compressor casing constituting a (for example, a turboshaft engine) or a turbine casing constituting an aircraft gas turbine (for example, a turboshaft engine).

  In the pressure tube mounting structure, a flange member whose bottom surface is in close contact with the outer surface of the casing and closes the opening of the recess is provided at one end of the pressure tube, and is attached to the outer surface of the casing. It is more preferable that they are fixed.

According to such a pressure tube mounting structure, one end of the pressure tube is fixed to the outer surface of the casing by the adhesive and the flange member.
Thereby, even when the performance of the adhesive is deteriorated due to aging or the like, it is possible to prevent the pressure tube from coming off by the flange member separately fixed to the casing, and it is possible to improve the reliability of the structure.

  In the pressure tube mounting structure, it is more preferable that the flange member is provided with at least one hole communicating with the recess.

According to such a pressure tube mounting structure, the hole provided in the flange member fills the recess with the adhesive with the peripheral edge (outer peripheral portion) of the flange member in close contact with the outer surface of the casing. Used as a hole for filling the adhesive when going, or as a hole for venting when filling the recess with the adhesive with the peripheral edge (outer peripheral part) of the eaves member raised (pulled up) It will be.
Thereby, the adhesive can be filled in the recess without any gap, and one end of the pressure tube can be reliably fixed to the outer surface of the casing.

  In the pressure tube mounting structure, the recess has an inner diameter formed to be the same as or slightly larger than the outer diameter of the tapered portion, and the tapered portion. It is more preferable to include a diameter-enlarged portion that receives the peripheral portion of the outer periphery and a reduced-diameter portion having an inner diameter formed to be slightly smaller than the outer diameter of the tapered portion.

According to such a pressure tube mounting structure, one end of the pressure tube is attached to the outer surface of the casing by fitting (engaging) the adhesive, the flange member, and the peripheral portion of the tapered portion with the enlarged diameter portion. It will be fixed.
As a result, even if the performance of the adhesive deteriorates due to aging or the like, the pressure tube can be removed by fitting (engaging) the flange member separately fixed to the casing and the peripheral portion of the tapered portion and the enlarged diameter portion. Can be prevented, and the reliability of the structure can be improved.
In addition, even if the performance of the adhesive is deteriorated due to aging or the like and the flange member is not fixed to the casing (when the fixing relationship between the casing and the flange member is released), the taper The fitting (engagement) between the peripheral edge portion of the portion and the enlarged diameter portion can prevent the pressure tube from coming off, and the reliability of the structure can be improved.

  An aircraft gas turbine according to the present invention includes any one of the above-described pressure tube mounting structures.

  According to the gas turbine for an aircraft according to the present invention, it is not necessary to secure the thickness of the casing conventionally required for attaching one end portion of the pressure tube, and the casing can be thinned. The overall weight can be reduced.

  According to the pressure tube mounting structure of the present invention, a compressor casing constituting an aircraft gas turbine (for example, a turboshaft engine) and a turbine casing constituting an aircraft gas turbine (for example, a turboshaft engine). The effect that it can be applied to a thin-walled casing is obtained.

It is a schematic block diagram of the gas turbine engine provided with the attachment structure of the pressure tube which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the attachment structure of the pressure tube which concerns on 1st Embodiment of this invention. It is a figure for demonstrating the attachment procedure of the pressure tube which concerns on 1st Embodiment of this invention, Comprising: (a) is a top view which shows the state which attached the collar member to the front-end | tip part of a pressure tube, (b) is a pressure It is a side view which shows the state which attached the collar member to the front-end | tip part of a tube. It is a figure for demonstrating the attachment procedure of the pressure tube which concerns on 1st Embodiment of this invention, Comprising: It is sectional drawing which shows the state which processed the recess for attachment in the thin casing. It is a figure for demonstrating the attachment procedure of the pressure tube which concerns on 1st Embodiment of this invention, Comprising: It is sectional drawing which shows the state which the attachment to a casing was completed. It is a figure which shows the attachment structure of the pressure tube which concerns on 2nd Embodiment of this invention, Comprising: (a) is a top view, (b) is sectional drawing. It is sectional drawing which shows the attachment structure of the pressure tube which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows the packing state or mounting state of the gas turbine engine which comprised the attachment structure of the pressure tube which concerns on this invention. It is sectional drawing for demonstrating the attachment structure of the conventional pressure tube. It is sectional drawing for demonstrating the attachment structure of the conventional pressure tube.

[First Embodiment]
Hereinafter, a pressure tube mounting structure according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 5.
FIG. 1 is a schematic configuration diagram of a gas turbine engine having a pressure tube mounting structure according to the present embodiment, FIG. 2 is a cross-sectional view showing the pressure tube mounting structure according to the present embodiment, and FIG. 3 is according to the present embodiment. It is a figure for demonstrating the attachment procedure of a pressure tube, Comprising: (a) is a top view which shows the state which attached the scissors member to the front-end | tip part of a pressure tube, (b) attaches a scissors member to the front-end | tip part of a pressure tube FIG. 4 is a view for explaining the attachment procedure of the pressure tube according to the present embodiment, and is a cross-sectional view showing a state in which a mounting recess is processed in a thin casing, FIG. These are the figures for demonstrating the attachment procedure of the pressure tube which concerns on this embodiment, Comprising: It is sectional drawing which shows the state which the attachment to a casing was completed.

A pressure tube mounting structure 10 according to the present embodiment includes, for example, an aircraft gas turbine (a turboshaft engine in the present embodiment) 1 including a compressor 2, a combustor 3, and a turbine 4 shown in FIG. The present invention is applied to the compressor 2 and / or the turbine 4.
As shown in FIG. 2, the pressure tube mounting structure 10 includes a pressure tube (pressure measurement tube: pressure derivation tube) 11 and a recess 12.

  The pressure tube 11 includes a fluid in the casing 13 guided through the recess 12 (more specifically, the recess 12 and the communication hole 15) (in the case where the casing 13 constitutes the compressor 2, compressed air, and the casing 13 When the turbine 4 is configured, it is a pipe for guiding combustion gas) to a pressure sensor (not shown), one end of which is attached (connected) to the casing 13 and the other end is attached (connected) to a pressure sensor (not shown). )ing. Further, a tapered portion 14 is provided (formed) at one end portion of the pressure tube 11 that gradually (increases) the diameter toward one end (tip) thereof.

  The recess 12 is formed so that the inner diameter thereof is the same as or slightly larger than the outer diameter of the tapered portion 14, and the depth thereof is deeper than the height of the tapered portion 14. The cylindrical recess is formed so that the bottom surface thereof is in contact with the entire (front) end surface of the tapered portion 14. In addition, the central portion of the bottom surface of the recess 12 and the inner surface of the casing 13 are formed so that the inner diameter thereof is smaller than the inner diameter of the tapered portion 14, and the communication hole penetrates the casing 13 in the plate thickness direction. 15 to communicate with each other.

One end portion of the pressure tube 11 has a rectangular shape in plan view, and a flange member 16 made of SUS (stainless steel) foil (for example, having a thickness of 0.2 mm) extends from the lower surface to the (front) end surface of the tapered portion 14. Is attached (fixed) by brazing (or TIG welding) so that the distance (length) to the depth of the recess 12 is (substantially) the same as the depth of the recess 12. In the recess 12 formed by the side surface, the outer peripheral surface (outer surface) of the tapered portion 14, and the lower surface of the flange member 16 (for high temperature) adhesive (for example, heat resistance manufactured by Muromachi Technos Co., Ltd.) An inorganic adhesive (Aron ceramic) 17 is filled.
Further, as shown in FIG. 5, the flange member 16 is attached (fixed) to the outer surface of the casing 13 by spot welding.

Next, a procedure for attaching (mounting) the pressure tube 11 to the casing 13 will be described with reference to FIGS. 3 to 5.
First, as shown in FIGS. 3 (a) and 3 (b), a flange member 16 is brazed (or TIG welded) to the same end portion of the pressure tube 11 in which a tapered portion 14 is previously formed at one end portion. Install (fix).
In addition, the code | symbol 18 in Fig.3 (a) and FIG.3 (b) has shown the brazing part (or welding part).

On the other hand, as shown in FIG. 4, the recess 12 is processed on the outer surface of a predetermined portion of the casing 13 (the portion where pressure in the casing 13 is to be derived (extracted)), and then the recess 12 The communication hole 15 is processed (drilled) in the center.
In addition, the communication hole 15 is processed (drilled) at a predetermined position (a position where the pressure in the casing 13 is to be derived (extracted)) of the casing 13, and the communication hole 15 is positioned at the center ( The recess 12 may be processed as described above.

Subsequently, as shown in FIG. 5, the entire (front) end surface of the taper portion 14 is inserted into the recess 12 so as to be in contact with the bottom surface of the recess 12, and the entire (front) end surface of the taper portion 14 is recessed. The adhesive 17 is uniformly filled into the recess 12 (for high temperature) in a state where it is in contact with the bottom surface of 12 and the peripheral portion (outer peripheral portion) of the flange member 16 is lifted (pulled up).
Filling of the adhesive 17 (for high temperature) into the recess 12 formed by the inner peripheral surface (inner surface) of the recess 12, the outer peripheral surface (outer surface) of the tapered portion 14, and the lower surface of the flange member 16. Is completed (finished), the peripheral edge (outer peripheral part) of the flange member 16 is spot welded along the radial direction and the peripheral direction of the pressure tube 11 to complete the mounting (attachment) of the pressure tube 11 to the casing 13. (finish.

According to the pressure tube mounting structure 10 according to the present embodiment, a tapered portion 14 that gradually increases in diameter toward one end is provided at one end portion of the pressure tube 11 that is attached to the casing 13. Is housed in the recess 12 formed on the outer surface of the casing 13 and is fixed to the outer surface of the casing 13 by the adhesive 17 filled in the recess 12. Moreover, by making the one end part of the pressure tube 11 into the taper part 14, the depth of the recess 12 becomes small and the contact area of the taper part 12 and the adhesive agent 17 becomes large.
Accordingly, one end of the pressure tube 11 can be connected to an aircraft without providing a tapered female screw portion on the outer surface of the casing 13 and without deforming the casing 13 by heat generated during brazing or TIG welding. Reliably on the outer surface of a thin casing such as a casing of a compressor 2 constituting a gas turbine (for example, a turboshaft engine) 1 and a casing of a turbine 4 constituting an aircraft gas turbine (for example, a turboshaft engine) 1 Can be fixed to.

Further, according to the pressure tube mounting structure 10 according to this embodiment, one end of the pressure tube 11 is fixed to the outer surface of the casing 13 by the adhesive 17 and the flange member 16.
As a result, even if the performance of the adhesive 17 is deteriorated due to aging or the like, the pressure tube 11 can be prevented from coming off by the flange member 16 separately fixed to the casing 13, and the reliability of the structure 10 is improved. Can be made.

[Second Embodiment]
A pressure tube mounting structure according to a second embodiment of the present invention will be described with reference to FIG. 6A and 6B are views showing a pressure tube mounting structure according to the present embodiment, in which FIG. 6A is a plan view and FIG.
As shown in FIG. 6, the pressure tube mounting structure 20 according to the present embodiment is different from that of the first embodiment described above in that a flange member 21 is provided instead of the flange member 16. The other components and the procedure for attaching (mounting) the pressure tube 11 to the casing 13 are the same as those in the first embodiment described above, and therefore the description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above.

  The flange member 21 is provided with at least one (one in this embodiment) hole 22 that penetrates the flange member 21 in the thickness direction and communicates the inside of the recess 12 with the outside of the casing 13 (in the atmosphere). Being (formed). The hole 22 is used for filling the adhesive when filling the recess 12 (for high temperature) with the adhesive 17 in a state where the peripheral edge (outer peripheral part) of the flange member 21 is in close contact with the outer surface of the casing 13. It is used as a hole or a hole for venting air when filling the adhesive 12 (for high temperature) into the recess 12 with the peripheral edge (outer peripheral part) of the flange member 21 raised (pulled up). .

According to the pressure tube mounting structure 20 according to the present embodiment, the hole 22 provided in the flange member 21 is recessed in a state where the peripheral portion (outer peripheral portion) of the flange member 21 is in close contact with the outer surface of the casing 13. The adhesive 17 is placed in the recess 12 as a hole for filling the adhesive 17 when the adhesive 17 is filled in the inner wall 12 or in a state where the peripheral edge (outer peripheral part) of the flange member 21 is lifted (pulled up). It will be used as a hole for venting when filling.
Thereby, the adhesive 17 can be filled in the recess 12 without a gap, and one end of the pressure tube 11 can be reliably fixed to the outer surface of the casing 13.
Other functions and effects are the same as those of the above-described first embodiment, and thus description thereof is omitted here.

[Third Embodiment]
A pressure tube mounting structure according to a third embodiment of the present invention will be described with reference to FIG. FIG. 7 is a cross-sectional view showing a pressure tube mounting structure according to this embodiment.
As shown in FIG. 7, the pressure tube mounting structure 30 according to this embodiment is different from that of the first embodiment described above in that a recess 31 is provided instead of the recess 12. Since other components are the same as those of the first embodiment described above, description of the other components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above.

  The recess 31 is formed so that the inner diameter thereof is the same as or slightly larger than the outer diameter of the tapered portion 14, and receives the peripheral portion (outer peripheral portion) of the tapered portion 14 ( An enlarged diameter portion 32 that fits with the peripheral edge (outer circumference) of the taper portion 14 and a reduced diameter portion 33 that has an inner diameter slightly smaller than the outer diameter of the taper portion 14 are provided. Further, the recess 31 is formed so as to be deeper than the height of the tapered portion 14, and the bottom surface thereof is formed so as to be in contact with the entire (front) end surface of the tapered portion 14.

According to the pressure tube mounting structure 30 according to the present embodiment, one end portion of the pressure tube 11 is fitted (engaged) with the adhesive 17, the flange member 16, and the peripheral portion of the tapered portion 14 and the enlarged diameter portion 32. ) To be fixed to the outer surface of the casing 13.
Thereby, even when the performance of the adhesive 17 is deteriorated due to aging or the like, the flange member 16 fixed to the casing 13 and the peripheral portion of the tapered portion 14 and the enlarged diameter portion 32 are engaged (engaged). Therefore, the pressure tube 11 can be prevented from coming off, and the reliability of the structure 30 can be improved.
Further, if the performance of the adhesive 17 is deteriorated due to deterioration over time and the flange member 16 is not fixed to the casing 13 (the fixed relationship between the casing 13 and the flange member 16 has been solved). However, the fitting (engagement) between the peripheral edge portion of the tapered portion 14 and the enlarged diameter portion 32 can prevent the pressure tube 11 from coming off, and the reliability of the structure 30 can be improved.
Other functions and effects are the same as those of the above-described first embodiment, and thus description thereof is omitted here.

  In addition, the performance tube before the product shipment is finished, and the pressure tube 11 when being put in a packing tool (conveyance tool) 80 such as a wooden box and shipped, or the performance test before the product shipment is required. The pressure tube 11 that is not required when mounted on (rotary wing aircraft in the present embodiment) is in the middle (more specifically, the casing 13) so that the cutting portion is located inside the packing tool 80 or the cowling 80. It is cut at the base part (one end part) close to, and the cut part is closed by the plug 81 or the like.

  Further, the present invention is not limited to the above-described embodiment, and can be appropriately modified and modified as necessary, for example, by combining the second embodiment and the third embodiment described above. .

DESCRIPTION OF SYMBOLS 1 Aircraft gas turbine 10 Pressure tube attachment structure 11 Pressure tube 12 Recess 13 Casing 14 Tapered part 16 Girder member 17 Adhesive 20 Pressure tube attachment structure 21 Girder member 22 Hole 30 Pressure tube attachment structure 31 Recess 32 Expansion Diameter part 33 Reduced diameter part

Claims (5)

A pressure tube mounting structure in which one end of a pressure tube that guides the working fluid in the casing to the pressure sensor is attached to the outer surface of the casing,
A pressure tube provided at one end with a tapered portion gradually expanding toward one end;
A recess provided on the outer surface of the casing to accommodate the tapered portion;
A pressure tube mounting structure comprising: an adhesive filled in the recess formed by an inner peripheral surface of the recess and an outer peripheral surface of the tapered portion.   A saddle member whose bottom surface is in close contact with the outer surface of the casing and closes the opening of the recess is provided at one end of the pressure tube and fixed to the outer surface of the casing. The pressure tube mounting structure according to claim 1.   The pressure tube mounting structure according to claim 1 or 2, wherein the flange member is provided with at least one hole communicating with the recess.   The recessed portion has an inner diameter formed so as to be the same as or slightly larger than the outer diameter of the tapered portion, and a diameter-enlarged portion that receives a peripheral portion of the tapered portion. And a reduced diameter portion having an inner diameter formed so as to be slightly smaller than the outer diameter of the tapered portion. 5. The pressure tube according to claim 1, Mounting structure.   An aircraft gas turbine comprising the pressure tube mounting structure according to any one of claims 1 to 4.

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