JP2006242586A - Stress measuring apparatus and strain gauge mounting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a strain gauge mounting method capable of avoiding the occurrence of failures such as the peeling of a stress gauge and the breakage of wires and improving reliability in stress measurement even at high rotations and at high temperatures and facilitating a pasting operation at a low price and provide a stress measuring apparatus of a compact structure capable of safe and accurate transmission without causing damage in a transmission member. <P>SOLUTION: In the stress measuring apparatus for detecting stress acting on a structure by the stress gauge, the stress gauge is fixed to a metal foil containing a stainless foil by spot-welding, and an output end of the stress gauge is connected to an end part of a sheathed wire for output of the stress gauge by brazing including silver brazing. The connection part is fixed to the metal foil by an adhesive, and the metal foil containing the stainless foil is made to cover the adhesive. Each member is provided with a stress gauge unit fixed and integrated onto the metal foil. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is applied to, for example, stress measurement of a turbo blade for a turbocharger, detects a stress acting on a structure including the turbine blade by a strain gauge constituting the stress detection body, and includes the rotating body. The present invention relates to a stress measurement device configured to easily extract detection data from the stress detection body to the outside in a structure, and a method of attaching a strain gauge as the stress detection body.

  A strain gauge is used as a stress detector for stress measurement of turbine blades of an exhaust turbocharger (hereinafter referred to as a turbocharger), but since the turbine blades rotate at high speed, the vicinity of the strain gauge attachment portion The gravitational acceleration of the turbine blade is as large as about 100,000 G, and the gas temperature around the turbine blade is a high temperature that rises to about 500 ° C. Therefore, the strain gauge is peeled off from the turbine blade and the output wire from the strain gauge is The environment is prone to problems such as disconnection.

A technique provided in Patent Document 1 (Japanese Utility Model Laid-Open No. 57-103596) is one of techniques for detecting the stress of a moving blade (turbine blade) of a steam turbine using a strain gauge as a stress detector. is there.
In such a technique, a transmission antenna attached to a side surface of a disk part of a turbine rotor is connected to a strain gauge attached to a turbine blade of a low-pressure stage of a steam turbine, and a receiving antenna is attached to a case side. The stress detection signal from the strain gauge oscillated from the transmitting antenna attached to the transmitter is transmitted to the receiving antenna attached to the stationary member.

Japanese Utility Model Publication No. 57-103596

In the case of using a strain gauge as a stress detector for stress measurement of a turbo blade of a turbocharger, as described above, the turbine blade is operated at a high speed under high temperature. It is in a condition where defects such as peeling and disconnection of the output conductor from the strain gauge are likely to occur.
As means for avoiding the occurrence of such a problem, means for attaching a strain gauge to a turbine blade by thermal spraying is provided, but a strain gauge compatible with thermal spraying is expensive, and the application of strain gauge by thermal spraying requires a work period. There is a problem of becoming longer.
Further, in Patent Document 1 (Japanese Utility Model Publication No. 57-103596), since the stress measurement is performed on the turbine blade of the low-pressure stage of the steam turbine at a low temperature, means for avoiding the occurrence of the above-described problem is disclosed. Is not taken.

  In transmitting the stress detection data of the turbine blade from the rotating portion including the turbine blade and the turbine rotor to the stationary portion that performs data processing, in Patent Document 1, the transmission attached to the side surface of the disk portion of the turbine rotor. Since the stress detection data is transmitted from the antenna to the receiving antenna on the case side, the transmitting antenna is exposed to the gas, and if the gas is a high-temperature gas, the transmitting antenna may be melted or damaged. Is produced and lacks compactness.

In view of the problems of the prior art, the present invention is free from the occurrence of defects such as peeling from a bonded structure such as a turbine blade of a strain gauge or disconnection of an output lead wire from the strain gauge even under high temperature and high rotation. A first object of the present invention is to provide a strain gauge mounting method that can be avoided and improve the reliability of stress measurement, and that can be easily applied to a structure to be bonded at a low cost in a short time.
In addition, the second object of the present invention is to provide a small and compact structure that can safely transfer stress detection data from a rotating body such as a turbine rotor without damaging a transmission member such as a transmission antenna. It is another object of the present invention to provide a stress measuring apparatus that can transmit accurately.

The present invention achieves such an object, and in a stress measuring device for detecting stress acting on a structure by a strain gauge, the strain gauge is fixed on a metal foil including a stainless steel foil by spot welding, and the strain gauge The output end of the strain gage and the end of the sheath wire for output of the strain gauge are connected by brazing including silver brazing, and the connecting portion is fixed onto the metal foil by an adhesive, and the stainless steel is placed on the adhesive. The present invention is characterized by comprising a strain gauge unit which is configured to be covered with a metal foil including a foil and in which each member is fixed and integrated on the metal foil.
In this invention, preferably, the output end of the strain gauge and the sheath wire are connected with a certain amount of slack at the connection portion, and the sheath wire is connected to the metal via a pressing foil including a stainless steel foil. It is fixed on the foil by spot welding.

  Further, the invention of the strain gauge mounting method includes connecting the output end of the strain gauge to the end of the output sheath wire of the strain gauge by brazing including silver brazing, and including the stainless steel foil in the connecting portion. The metal foil is fixed on the metal foil with an adhesive, and the adhesive is covered with a metal foil including a stainless steel foil. The strain gauge is fixed on the metal foil by spot welding, and the end portion of the sheath wire is stainless steel foil. It fixes by the point welding on the said metal foil through the foil for pressers containing.

  Further, in the invention in which the strain gauge is applied to a stress detection body of a rotating body including a turbine blade, the strain gauge is fixed on a metal foil including a stainless steel foil by spot welding, and the output end of the strain gauge and the strain The end of the sheath wire for output of the gauge is connected by brazing including silver brazing, and the connecting portion is fixed onto the metal foil with an adhesive, and the adhesive is covered with a metal foil including stainless steel foil. The strain gauge unit is configured to be covered and fixed on the metal foil and integrated, and the metal foil is fixed to the surface of the rotating body by spot welding.

According to this invention, the output end of the strain gauge is connected from the strain gauge to the end of the sheath wire for outputting stress detection data, preferably by brazing with silver brazing, and this connection is preferably made of stainless steel foil. The metal foil is preferably fixed with an adhesive made of a ceramic adhesive, and the adhesive is covered with a metal foil preferably made of stainless steel foil.
Next, the strain gauge connected to the end portion of the sheath wire as described above is fixed onto the metal foil by spot welding, and the end portion of the sheath wire is preferably inserted through a presser foil including a stainless steel foil. It fixes on the said metal foil by spot welding.

  Through the above steps, the strain gauge is preferably fixed by spot welding on the metal foil made of stainless steel foil, and the connection portion between the output end of the strain gauge and the end of the sheath wire covers the surface with the metal foil. In this way, a strain gauge unit is obtained, which is fixed by an adhesive in the form and the end of the sheath wire is fixed by spot welding through the metal foil, so that the strain gauge and the sheath wire are formed on one metal foil. The end portion is fixed by spot welding and the connection portion between the output end of the strain gauge and the end portion of the sheath wire is covered with a metal foil and fixed with an adhesive material, thereby forming a strain gauge unit having a strong structure. Even when affixed to a structure that rotates at a high temperature, such as a wing, it is possible to prevent the strain gauge from peeling off from the structure, and to disconnect the sheath wire connected to the strain gauge or to connect the strain gauge to the sheath. With the end of the line It is possible to prevent the occurrence of peeling of the connection portion, stress reliability have been improved measuring device is obtained.

  In addition, the strain gauge and the end of the sheath wire are fixed on one metal foil by spot welding, and the connecting portion between the output end of the strain gauge and the end of the sheath wire is covered with the metal foil. A strain gauge unit fixed by an adhesive is fixed to a structure such as a rotating body including turbine blades, and a metal foil as a base of the strain gauge unit is fixed to the surface of the structure (rotating body) by spot welding. As a result, the strain gauge unit can be constructed at a lower cost and the structure of the strain gauge unit is lower than the means for attaching the strain gauge according to the prior art to the structure (turbine blade) by thermal spraying. The sticking work to the body (rotating body) can be easily performed in a short time.

  The present invention also provides a stress detection lead wire connected to an output end of a stress detection body that is attached to a rotary body including turbine blades and detects a stress acting on the rotary body, through the shaft portion of the rotary body. In a stress measuring device for a rotating body configured to be taken out, a transmission capsule in which a transmitter and a power source for driving a transmitter are housed in a cylindrical capsule case and integrated in a capsule shape, and a transmitter of the transmission capsule A transmitting antenna that is connected and transmits stress detection data transmitted from the stress detecting body to the transmitter to a receiving antenna installed outside the rotating body is attached to an end of the rotating body. .

  According to this invention, the transmitter and the power source for driving the transmitter are housed in a cylindrical capsule case and integrated in a capsule shape, and transmitted from the stress detector to the transmitter of the transmission capsule Since the transmitting antenna that transmits the stress detection data to the receiving antenna installed outside the rotating body is installed using the space at the end of the rotating body, the stress detection data transmitting equipment from the stress detecting body is small. In addition to being compact, as in the prior art provided in Patent Document 1, stress detection data transmission equipment including a transmission antenna is exposed to high-temperature gas and the transmission antenna is melted or damaged. Therefore, the durability and reliability of the stress detection data transmission facility are remarkably improved.

Preferably, in the invention, the power source is composed of a plurality of lithium button batteries, and the same number of transmitters as the lithium button batteries are provided, and the lithium button batteries and the transmitters are connected to each other by conductive wires. Are arranged in the circumferential direction in the capsule case, and both are molded into the capsule case.
With this configuration, since a small and inexpensive lithium button battery is used as the power source of the transmitter in the transmission capsule, the power source of the transmitter can be reduced in cost compared to a commercially available battery, etc. Since the lithium button battery and each transmitter are connected by conducting wires and arranged in the circumferential direction in the capsule case and molded in the capsule case, the transmission capsule can be reduced in size, and as a result, the stress detection data transmission facility is further provided. Small and compact.

In this invention, preferably, a cooling water conduit for circulating cooling water that cools the periphery of the transmission capsule is provided outside the mounting portion of the transmission capsule, and a cooling air outlet that blows cooling air to the transmission capsule The cooling capsule is provided so that the transmission capsule is indirectly cooled by the cooling water in the cooling water pipe, and the transmission capsule is directly cooled by blowing the cooling air.
According to this structure, means for lowering the ambient temperature around the transmission capsule by indirectly cooling the periphery of the transmission capsule with the cooling water circulating in the cooling water pipe, and the transmission capsule by blowing the cooling air By using together with the means for directly cooling the transmission capsule, the cooling effect of the transmission capsule is increased, and the transmission capsule can be always kept below the allowable temperature.

According to the present invention, the ends of the strain gauge and the sheath wire are fixed on one metal foil preferably made of stainless steel foil by spot welding, and the output end of the strain gauge and the end of the sheath wire are fixed. It becomes a strain gauge unit with a strong structure in which the connection part is covered with metal foil and fixed with an adhesive, and even if it is attached to a structure that rotates at high speeds such as turbine blades at high temperatures, the strain gauge structure Stress that can prevent the occurrence of delamination from the wire and can prevent the breakage of the sheath wire connected to the strain gauge and the separation of the connection portion between the strain gauge and the end of the sheath wire. A measuring device is obtained.
Also, the strain gauge unit configured as described above is applied to a structure such as a rotating body including turbine blades, and a metal foil that is a base of the strain gauge unit is spot-welded to the surface of the structure (rotating body). Since it can be attached to the structure simply by fixing it, the strain gauge unit can be constructed at a lower price than the means for attaching the strain gauge according to the prior art to the structure (turbine blade) by thermal spraying. The sticking work to the structure (rotating body) can be easily performed in a short time.

  According to the present invention, a transmission capsule in which a transmitter and a power source for driving a transmitter are housed in a cylindrical capsule case and integrated in a capsule shape, and a transmission antenna for transmitting stress detection data from the stress detection body Is installed by effectively utilizing the space at the end of the rotating body, so that the stress detection data transmission equipment becomes compact and compact, and the stress detection data transmission equipment including the transmission antenna is exposed to high-temperature gas to transmit the stress detection data transmission equipment. The antenna is not damaged or damaged, and the durability and reliability of the stress detection data transmission equipment are remarkably improved.

Further, according to the present invention, by using a small and inexpensive lithium button battery as a power supply for the transmitter in the transmission capsule, the power supply of the transmitter can be reduced, and a plurality of the lithium button batteries and each transmitter can be reduced. Are connected in the circumferential direction in the capsule case and molded in the capsule case, whereby the transmission capsule can be reduced in size, and as a result, the stress detection data transmission facility can be further reduced in size and size.
Further, according to the present invention, means for lowering the ambient temperature around the transmission capsule by indirectly cooling the periphery of the transmission capsule with cooling water circulating in the cooling water pipe, and the transmission capsule by blowing the cooling air By using together with the means for directly cooling, the cooling effect of the transmission capsule is increased, and the transmission capsule can always be kept below the allowable temperature.

  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.

1A and 1B show a strain gauge unit according to a first embodiment of the present invention, in which FIG. 1A is a side view and FIG. 1B is a plan view. FIG. 2 shows the strain gauge unit mounting structure of the turbocharger turbine blade according to the first embodiment, (A) is a schematic front view of the turbine rotor of the turbocharger, and (B) is a view of the turbine blade. It is a side view which shows a strain gauge unit attachment structure.
In FIG. 1, reference numeral 10 denotes a strain gauge unit, which is configured as follows.
1 is a strain gauge for stress detection (strain detection), 2 is a stainless steel foil, and the strain gauge 1 can be a commercially available product such as SKW-10230 type strain gauge, and is spot welded to the upper surface of the stainless steel foil 2 ( It is fixed by spot welding). Reference numeral 8 denotes a spot weld.

A sheath wire 6 transmits stress detection data from the strain gauge 1. The input end 6a of the sheath wire 6 and the output end 1a of the strain gauge 1 are connected by silver brazing 7 (may be brazing other than silver brazing), and the connecting portion is connected by the ceramic adhesive 5 The ceramic adhesive 5 is fixed on the stainless steel foil 2 and covered with the stainless steel foil 3 for pressing.
The output end 1a of the strain gauge 1 and the input side end 6a of the sheath wire 6 are connected to each other with a certain amount of slackness at the connection portion by the silver brazing 7 and fixed by the ceramic adhesive 5. The sheath wire 6 is pressed by a presser foil 4 made of stainless steel foil and fixed onto the stainless steel foil 2 by spot welding (8 indicates a spot welded portion).
In this way, the output end 1 a of the strain gauge 1 and the input side end 6 a of the sheath wire 6 are connected with a certain amount of slack at the connection portion by the silver brazing 7 and fixed by the ceramic adhesive 5. By doing so, it is possible to prevent the strain gauge 1 from peeling off or the sheath wire 6 from being broken when an unexpected force is applied between the strain gauge 1 and the sheath wire 6.
In place of the stainless steel foil, other metal foils can be used depending on temperature conditions and rotation speed conditions.

When the strain gauge unit 10 as described above is manufactured and attached to the turbine blade for detecting the stress of the turbine blade of the exhaust turbocharger, the following procedure is performed.
That is, first, the output end 1a of the strain gauge 1 is connected to the input side end portion 6a of the sheath wire 6 by silver brazing 7, and this connection portion is fixed on the stainless steel foil 2 by a certain amount as described above. The ceramic adhesive 5 is fixed and covered with the presser stainless steel foil 3.
Next, the strain gauge 1 connected to the input side end portion 6a of the sheath wire 6 as described above is fixed on the stainless steel foil 2 by spot welding 8, and the end portion of the sheath wire 6 is made of stainless steel foil. It is pressed by the presser foil 4 and fixed on the stainless steel foil 2 by spot welding 8.

  The strain gauge unit 10 manufactured as described above is attached to the stress detection site of the turbine blade 11 that is implanted in the outer periphery of the turbine rotor 12 as shown in FIGS. 2 (A) and 2 (B). In the sticking, the strain gauge unit 10 is fixed by spot welding the stainless steel foil 2 which is the base of the strain gauge unit 10 to the surface of the turbine blade 11. Then, the sheath wire 6 from the strain gauge unit 10 is spot-welded to the turbine blade 11 with a pressing foil 012 made of stainless steel foil. (D) is CC sectional drawing of FIG. 2 (B). The sheath wire 6 is spot welded 8 to the surface of the turbine blade 11 with a pressing foil 012 made of stainless steel foil, and is stuck. In this example, the case where the strain gauge units 10 are attached to the four turbine blades 11 is shown, but the number of the turbine blades 11 to which the strain gauge units 10 are attached is arbitrary.

  According to the first embodiment, the output end 1a of the strain gauge 1 is connected to the input side end 6a of the sheath wire 6 for outputting stress detection data from the strain gauge 1 by the silver brazing 7, and this connection portion. Is fixed on the stainless steel foil 2 with a ceramic adhesive 5, and the adhesive 5 is covered with a presser stainless steel foil 3, and the strain gauge 1 connected to the input side end 6a of the sheath wire 6 is connected to the stainless steel foil. It is fixed on the foil 2 by spot welding 8, and further, the end of the sheath wire 6 is pressed by a pressing foil 4 such as stainless steel foil and fixed on the stainless steel foil 2 by spot welding 8. The strain gauge unit 10 can be manufactured.

  Through the steps as described above, the strain gauge 1 is fixed on the base stainless steel foil 2 by spot welding 8, and the connection portion between the output end 1a of the strain gauge 1 and the input side end portion 6a of the sheath wire 6 is secured. The strain gauge unit 10 is obtained in which the surface is fixed by the ceramic adhesive 5 in a form covered with the pressing stainless steel foil 3 and the end of the sheath wire 6 is fixed by the spot welding 8 via the pressing foil. Therefore, the strain gauge 1 and the input side end 6a of the sheath wire 6 are fixed on the single stainless steel foil 2 by spot welding 8, and the output end 1a of the strain gauge 1 and the input side end of the sheath wire 6 are fixed. The strain gauge unit 10 has a strong structure in which the connection portion with the pressing stainless steel foil 3 is covered with the ceramic adhesive material 5 in a form covered with the presser stainless steel foil 3. Even if worn, it is possible to prevent the strain gauge 1 from being peeled off from the turbine blade 11 and to disconnect the sheath wire 6 connected to the strain gauge 1 or to connect the strain gauge 1 to the end of the sheath wire 6. Occurrence of peeling of the part can be prevented, and a stress meter device with improved reliability can be obtained.

  Further, the ends of the strain gauge 1 and the sheath wire 6 are fixed on the single stainless steel foil 2 by spot welding 8, and the output end 1a of the strain gauge 1 and the input side end 6a of the sheath wire 6 are connected. The strain gauge unit 10 is fixed to the turbine blade 11 with the connecting portion of the stainless steel foil 3 covered with the presser stainless steel foil 3, and the stainless steel foil 2 that is the base of the strain gauge unit 10 is attached to the turbine blade 11. The strain gauge unit 10 can be constructed at a lower cost than the means for attaching the strain gauge according to the prior art to the turbine blade 11 by thermal spraying because it can be attached to the turbine blade 11 simply by fixing it to the surface of the blade by spot welding 8. In addition, the operation of attaching the strain gauge unit 10 to the turbine blade 11 can be easily performed in a short time.

FIG. 3 is a longitudinal sectional view showing a structure for mounting a stress detection data transmission facility equipped with a transmission capsule according to a second embodiment of the present invention to the end of a turbocharger turbine rotor. FIG. 4 shows the transmission capsule in the second embodiment, (A) is a front view (sectional view), (B) is a cross-sectional view taken along line AA in (A), and (C) is B in (A). FIG. FIG. 5 is a side view of the lithium button battery in the second embodiment.
In FIG. 3, 12 is a turbine rotor, 11 is a turbine blade, 10 is a strain gauge unit affixed to the turbine blade 11, and 60 is a conductor for detecting stress from the strain gauge unit 10. The strain gauge unit 10 is attached to four turbine blades 11 as in the first embodiment of FIG. Reference numeral 12 a denotes a rotational axis of the turbine rotor 12.

Reference numeral 30 denotes a transmission capsule configured as described later. Reference numeral 35 denotes a cylindrical housing fixed to the shaft end surface of the turbine rotor 12 by a plurality of bolts 350. The transmission capsule 30 is housed and fixed inside the housing 35. Has been. Reference numeral 41 denotes a cover of the housing 35, and 36 denotes a transmission antenna. The transmission antenna 36 is fixed to the rear end surface of the housing 35 by a plurality of bolts 410 together with the cover 41. These constitute the transmission unit 300.
Reference numeral 37 denotes a receiving antenna that receives a stress detection signal from the transmitting antenna 36, and a plurality of brackets 40 that support a cooling water inlet pipe 50, a cooling water outlet pipe 51, and a cooling air pipe 52, which will be described later, are provided via a support ring 38. It is fixed with bolts. A receiving cable 370 is connected to the receiving antenna 37 through the through hole 40a of the bracket 40.

  Next, in FIGS. 4A, 4B, and 4C showing the details of the transmission capsule 30, 33 is a capsule case formed in a cylindrical shape, and four capsules ( 32 and four lithium button batteries 31 that are power sources for driving the transmitter 32 are housed and integrated in a capsule shape. The lithium button batteries 31 and the transmitters 32 are connected to each other by conducting wires 311 and 312 and are arranged in the capsule case 33 at equal intervals in the circumferential direction. The lithium button batteries 31 and the transmitters 32 are connected to the capsule case. 33 is fixed by a mold.

Further, as shown in FIG. 3, the four transmitters 32 are connected to the stress detection conductors 60 from the four strain gauge units 10 and input stress detection signals from the strain gauge units 10. Is done. The output end of each transmitter 32 is connected to the receiving cable 370, and a stress detection signal is transmitted to a stress calculating means (not shown) via the receiving cable 370.
In FIG. 5 showing the details of the lithium button battery 31, the negative side 312 of the conductive wire connecting the lithium button battery 31 and the transmitter 32 is connected to the electrode, and the positive side 311 is soldered to the lithium button battery 31 ( 31c is a soldering part).

  According to the second embodiment, a transmitter 32 and a lithium button battery 31 as a power source for driving the transmitter 32 are housed in a cylindrical capsule case 33, and the transmission capsule 30 is integrated in a capsule shape. A transmitting antenna 36 for transmitting the stress detection data transmitted from the strain gauge unit 10 to the transmitter 32 of the transmitting capsule 30 to a receiving antenna 37 installed outside the turbine rotor 12, at the end of the turbine rotor 12. Since the space is effectively used, the stress detection data transmission equipment from the strain gauge unit 10 becomes small and compact, and the stress detection including the transmission antenna 36 as in the prior art provided in Patent Document 1 above. Data transmission equipment is exposed to high-temperature gas, and the transmission antenna is melted or damaged. DOO without, durability of the stress detecting data transmission equipment, is greatly improved reliability.

  The power supply body of the transmitter 32 is composed of a plurality of lithium button batteries 31, and the same number of transmitters 32 as the lithium button batteries 31 are provided so that the lithium button batteries 31 and the transmitters 32 are connected to each other. 311 and 312 are connected in the circumferential direction in the capsule case 33 and both are molded in the capsule case 33. Thus, in the transmission capsule 30, a small and inexpensive lithium button battery 31 is connected to the transmitter 32. As a power source for the battery, the cost of the power source of the transmitter 32 can be reduced as compared with a commercially available battery, etc. Arranged in the circumferential direction in the capsule case 33, By the mold Puserukesu 33, the transmission capsule 30 can be miniaturized, can be further downsizing the stress detecting data transmission equipment as a result.

FIG. 6 is a longitudinal sectional view showing a cooling structure around the transmission capsule according to the third embodiment of the present invention.
In the third embodiment, a cooling means for the transmission capsule is additionally provided in the second embodiment (FIGS. 3 to 5), and the outside of the mounting portion of the transmission unit 300 in which the transmission capsule 30 is accommodated. The cooling water inlet pipe 50 and the cooling water outlet pipe 51 constituting the cooling water pipe through which the cooling water for cooling the periphery of the transmission capsule 30 circulates, and the annular connection connecting the cooling water inlet pipe 50 and the cooling water outlet pipe 51. A passage 53 is provided, and a cooling air pipe 52 provided with a cooling air outlet 52 a for blowing cooling air to the transmission capsule 30 along the rotational axis 12 a of the turbine rotor 12 is provided.

Accordingly, in the third embodiment, the transmission capsule 30 is indirectly cooled by the cooling water flowing from the cooling water inlet pipe 50 through the annular passage 53 to the cooling water outlet pipe 51, and from the cooling air jet 52a. The transmission capsule 30 is directly cooled by blowing cooling air.
According to the third embodiment, means for lowering the ambient temperature around the transmission capsule 30 by indirectly cooling the periphery of the transmission capsule 30 with the cooling water circulating in the cooling water pipes 50, 51, 52. The cooling effect of the transmission capsule 30 is increased by using together with a means for directly cooling the transmission capsule 30 by blowing cooling air from the cooling air outlet 52a, so that the transmission capsule 30 is always kept below the allowable temperature. Can hold.

  According to the present invention, stress measurement is possible by avoiding the occurrence of defects such as peeling from a bonded structure such as a turbine blade of a strain gauge and disconnection of an output conductor from the strain gauge even under high temperature and high rotation. In addition to improving the reliability of the strain gauge, it is possible to provide a strain gage mounting method that can be applied to the adherend structure at a low cost and in a short time, and the stress detection data can be obtained with a compact and compact structure. Thus, it is possible to provide a stress measurement device that can transmit stress detection data from a rotating body such as a turbine rotor safely and accurately without causing damage to the transmission member.

The strain gauge unit which concerns on 1st Example of this invention is shown, (A) is a side view, (B) is a top view. 1 shows a turbocharger turbine blade strain gauge unit mounting structure according to a first embodiment of the present invention, (A) is a schematic front view of a turbine rotor of the turbocharger, and (B) is a strain gauge unit for the turbine blade. The side view which shows an attachment structure, (C) is ZZ sectional drawing in (B). The longitudinal cross-sectional view which shows the attachment structure to the turbine rotor end part of the stress detection data transmission equipment provided with the transmission capsule which concerns on 2nd Example of this invention, (D) is CC sectional drawing in (B). The transmission capsule in the said 2nd Example is shown, (A) is a front view (sectional display), (B) is the sectional view on the AA line in (A), (C) is the sectional view on the BB line in (A). FIG. It is a side view of the lithium button battery in the second embodiment. It is a longitudinal cross-sectional view which shows the cooling structure around the transmission capsule which concerns on 3rd Example of this invention.

Explanation of symbols

1 Strain gauge 1a Output end 2 Stainless steel foil
3 Stainless steel foil for presser 4 Foil for presser 5 Ceramic adhesive 6 Sheath wire 6a Input side end 6a
7 Silver brazing 8 Point weld 10 Strain gauge unit 11 Turbine blade 12 Turbine rotor 30 Transmission capsule 31 Lithium button battery 32 Transmitter 33 Capsule case 35 Housing 36 Transmission antenna 37 Reception antenna 50 Cooling water inlet pipe 51 Cooling water outlet pipe 52 Cooling Air pipe 53 Annular passage 60 Conductor 300 Transmitting unit

Claims (7)

  In a stress measuring device for detecting stress acting on a structure by a strain gauge, the strain gauge is fixed on a metal foil including a stainless steel foil by spot welding, and an output end of the strain gauge and an output for the strain gauge are used. The end of the sheath wire is connected by brazing including silver brazing, the connecting portion is fixed on the metal foil with an adhesive, and the adhesive is covered with a metal foil including stainless steel foil. A stress measuring device comprising a strain gauge unit in which each member is fixed and integrated on the metal foil.   In the connecting portion, the output end of the strain gauge and the sheath wire are connected with a certain amount of slackness, and the sheath wire is spot-welded onto the metal foil via a pressing foil including a stainless steel foil. The stress measuring device according to claim 1, wherein the stress measuring device is fixed.   In a stress measuring apparatus for a rotating body that detects stress acting on a rotating body including a turbine blade by a strain gauge, the strain gauge is fixed on a metal foil including a stainless steel foil by spot welding, and an output end of the strain gauge An end of a sheath wire for output of the strain gauge is connected by brazing including silver brazing, and the connecting portion is fixed on the metal foil with an adhesive, and the metal including stainless steel foil on the adhesive The strain gauge unit is formed by covering with a foil, and each member is fixed and integrated on the metal foil, and the metal foil is fixed to the surface of the rotating body by spot welding. Stress measuring device.   In the method of attaching a strain gauge for detecting stress acting on a structure, the output end of the strain gauge is connected to the end of a sheath wire for output of the strain gauge by brazing including silver brazing, Is fixed on a metal foil containing a stainless steel foil with an adhesive, the adhesive is covered with a metal foil containing a stainless steel foil, the strain gauge is fixed on the metal foil by spot welding, and the sheath wire A method for attaching a strain gauge, characterized in that an end is fixed on the metal foil by spot welding via a presser foil including a stainless steel foil.   A stress detecting lead connected to an output end of a stress detecting body that is attached to a rotating body including a turbine blade and detects a stress acting on the rotating body is configured to be taken out through a shaft portion of the rotating body. In a stress measuring apparatus for a rotating body, a transmitter capsule in which a transmitter and a power source for driving a transmitter are housed in a cylindrical capsule case and integrated in a capsule shape, and connected to the transmitter of the transmission capsule to detect the stress A stress measuring device, wherein a transmitting antenna for transmitting stress detection data transmitted from a body to the transmitter to a receiving antenna installed outside the rotating body is attached to an end of the rotating body.   The power source is composed of a plurality of lithium button batteries and the same number of transmitters as the lithium button batteries are provided, and the lithium button batteries and the transmitters are connected to each other by conducting wires, respectively, in the circumferential direction in the capsule case The stress measuring device according to claim 5, wherein both are molded in the capsule case.   Provided on the outside of the transmission capsule mounting portion is a cooling water pipe through which cooling water for cooling the periphery of the transmission capsule circulates, and a cooling air pipe provided with a cooling air outlet for blowing cooling air to the transmission capsule. 6. The stress measuring device according to claim 5, wherein the transmission capsule is indirectly cooled by cooling water in the cooling water pipe and the transmission capsule is directly cooled by blowing the cooling air.

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