JP6117519B2 - Rotating body wiring device - Google Patents

Description

  The present invention relates to a rotating body wiring device, and more particularly, to a rotating body wiring device used in a rotary machine such as a steam turbine for measuring vibration stress of a turbine blade constituting the rotating body.

  As a method for measuring vibration stress of a high-speed rotating body such as a turbine blade (moving blade) such as a steam turbine or a gas turbine, vibration stress measurement using an FM telemeter or a slip ring is performed. In this measurement method, a strain gauge is attached directly to the rotating body to be measured, and the lead wire of the strain gauge is connected to a telemeter transmitter or slip ring terminal, and then measured with a receiver or strain amplifier. . Then, several output signals from the receiver and the distortion amplifier are simultaneously measured by a recorder to acquire and analyze vibration data (see, for example, Patent Document 1).

  Here, with reference to FIG. 5, the wiring apparatus 100 used for the method of measuring the stress of the turbine blade 5 which comprises the rotary body 2 of a steam turbine is demonstrated as an example. In a steam turbine, a plurality of disks 4 are coupled in the axial direction to form a rotation shaft, and a turbine blade 5 that is a member to be assembled is fixed to each disk 4 to rotate around a central axis. 2 is constituted.

  The lead wire 12 of the strain gauge 10 is wired from the turbine blade 5 to the disk 4 side through the disk fitting portion 9 between the turbine blade 5 and the disk 4, and is wired using a high-temperature adhesive 13. ing. The lead wire 12 is a single wire, and the adhesive 13 is integrally applied from the turbine blade 5 to the disk 4.

  In the above-mentioned configuration, if any of the structures and mounting methods of each part attached to the rotating body such as strain gauge, telemeter transmitter, transmitting antenna, battery, etc. are incomplete, the measurement will not be possible and the part will be damaged. If splattered, it will harm the turbine product. Therefore, in the current measurement method, it is necessary to attach these measurement parts directly to the machine product such as turbine blades. Therefore, it is necessary to pay close attention to the structure, material, and construction method of the parts for design and construction. is there.

JP-A-8-210929

  However, in the conventional rotating body wiring device, even when a shim for preventing backlash is inserted into the disk fitting portion 9 or other backlash portion, there is a slight displacement between the turbine blade 5 and the disk 4. It has occurred and a wiring failure has occurred due to damage to the wiring.

  The present invention has been made in consideration of such circumstances, and its purpose is to perform wiring due to damage to the wiring even when a slight displacement occurs between the turbine blades to be assembled and the rotating shaft. An object of the present invention is to provide a wiring device for a rotating body that can prevent defects.

In order to achieve the above object, the present invention provides the following means.
A wiring device for a rotating body according to the present invention is disposed on a surface of a rotating body including a member to be assembled and a rotating shaft to which the member to be assembled is fixed, over the member to be assembled and the rotating shaft, and includes a plurality of single wires. A wire formed by twisting, a first adhesive part for adhering the wiring on the surface of the member to be assembled to the surface of the member to be assembled, and the rotary shaft arranged at a distance from the first adhesive part. A second adhesive part for adhering the wiring on the surface of the rotating shaft to the surface of the rotating shaft, and a first leg part and a second leg having one end fixed to the surface of the rotating body and the other end spaced from the surface of the rotating body A guide bridge having a leg part and a connecting part for connecting the first leg part and the second leg part, wherein the wiring is spirally wound around the guide bridge. To do.

According to the above configuration, the adhesive is not integrally applied from the member to be assembled to the rotating shaft, and the first member and the second member are disposed with a space therebetween, so that the member to be assembled Even when a minute displacement caused by slippage or backlash occurs between the rotating shaft and the rotating shaft, the adhesive can be prevented from cracking.
In addition, since the wiring is a stranded wire formed by twisting a plurality of single wires, it has a structure that can handle more minute displacement.

  According to the above configuration, the surface treatment of the concavo-convex portion cannot be sufficiently performed by installing the guide bridge in the portion where the concavo-convex portion on the surface of the rotating body is formed and fixing the wiring to the guide bridge. Even when it is difficult to temporarily fix the wiring, the wiring can be securely fixed.

  In the rotating body wiring device, the guide bridge is preferably formed by bending a metal tube.

According to the present invention, the adhesive is not integrally applied from the member to be assembled to the rotating shaft, and the first member and the second member are disposed at an interval, whereby the member to be assembled Even when a minute displacement caused by slippage or backlash occurs between the rotating shaft and the rotating shaft, the adhesive can be prevented from cracking.
In addition, since the wiring is a stranded wire formed by twisting a plurality of single wires, it has a structure that can handle more minute displacement.

It is a schematic block diagram of the wiring apparatus of the rotary body of 1st embodiment of this invention. It is a principal part enlarged view of FIG. It is (a) plane schematic block diagram and (b) side surface schematic block diagram of the wiring apparatus of the rotary body of 2nd embodiment of this invention. It is a figure which shows another form of the guide bridge of 2nd embodiment of this invention. It is a schematic block diagram of the wiring apparatus of the conventional rotary body.

(First embodiment)
As shown in FIG. 1, the rotating body wiring device 1 according to this embodiment is used in a measuring device that measures vibration stress and the like of turbine blades 5 of a rotary machine such as a steam turbine.

  In a steam turbine, which is an example of a rotating machine, a plurality of disks 4 are connected in the axial direction to form a rotor portion 3 (rotating shaft), and turbine blades 5 are fixed to the respective disks 4 as members to be assembled. The rotating body 2 is configured to rotate about the central axis.

  Specifically, a blade groove 7 is formed on the periphery of the disk 4, and a blade root 8 formed in a Christmas tree shape of the turbine blade 5 is fitted and integrated. A shim is appropriately inserted in the gap between the blade groove 7 and the blade root 8 to eliminate as much play as possible. A strain gauge 10 (strain gauge) is attached to the turbine blade 5.

  The strain gauge 10 is a sensor that detects a strain, which is a minute change generated on the surface of the turbine blade 5, as an electrical signal, and includes a main body portion 11 and a pair of lead wires 12 (wiring) extending from the main body portion 11. It is configured.

  As shown in FIG. 2, the lead wire 12 is a so-called stranded wire having a structure in which at least two single wires are twisted together. The lead wire 12 of this embodiment is formed by twisting seven single wires having a diameter of 0.08 mm.

  The lead wire 12 is connected to the lead terminal 14, and the lead terminal 14 is connected to the lead terminal portion 16 via the second lead wire 15. The lead terminal unit 16 is connected to the telemeter transmitter 18 via the third lead wire 17, and the detection data detected by the strain gauge 10 becomes radio information (such as radio waves) from the telemeter transmitter 18. Then, it is transmitted to the telemeter receiver 19 on the stationary side.

  The lead wire 12 on the surface of the main body 11 of the strain gauge 10 and the turbine blade 5 is bonded to the surface of the turbine blade 5 by the first bonding portion 13a. The first bonding portion 13 a is a lump formed by applying an adhesive, and is applied to a range including the main body portion 11 of the strain gauge 10 and a part of the lead wire 12 on the surface of the turbine blade 5. It is formed by an adhesive.

  Further, the lead wire 12 on the disk 4 is bonded onto the disk 4 by the second bonding portion 13b. The second adhesive portion 13b is a lump of adhesive formed by applying an adhesive, and is formed by an adhesive applied to a range including a part of the lead wire 12 on the surface of the disk 4. ing.

  The first adhesive portion 13a and the second adhesive portion 13b are separated via the disk fitting portion 9. That is, the first adhesive portion 13a and the second adhesive portion 13b are arranged with a space therebetween, and the disc fitting portion 9 is disposed at this space. In other words, the adhesive is divided and applied, and no adhesive is applied to the disk fitting portion 9.

  As the adhesive, for example, a normal temperature curable high temperature adhesive having a use temperature range of −30 ° C. to 300 ° C. is preferably used. As the high-temperature adhesive, for example, a two-component mixed adhesive whose main component is polyester can be employed.

According to the above-described embodiment, the adhesive is not applied integrally from the turbine blade 5 to the disk 4, but is divided and applied with the disk fitting portion 9 as a boundary. Thereby, even when a minute displacement due to slippage or backlash occurs between the turbine blade 5 and the disk 4, it is possible to prevent the adhesive from cracking.
Moreover, since the lead wire 12 is a stranded wire, it has a structure that can cope with more minute displacement.

(Second embodiment)
Next, a rotating body wiring device 1 according to a second embodiment of the present invention will be described with reference to the drawings. In the present embodiment, differences from the first embodiment described above will be mainly described, and description of similar parts will be omitted.

As shown in FIGS. 3A and 3B , a part of the lead wire 12 on the disk 4 of the present embodiment is fixed on the disk 4 via a guide bridge 21. In FIG. 2, one lead wire 12 is shown, but it is assumed that a pair of lead wires 12 extends from the main body 11 of the strain gauge 10 as in FIG. 1.

  On the disk 4, a labyrinth seal 22 (seal fin) that seals leaked steam is provided. That is, the surface of the disk 4 on which the lead wire 12 is applied is not flat, and a plurality of protrusions are formed so as to block the lead wire 12. Further, a space between the disks 4 connected in the axial direction (interstep portion 23) is a concave groove, and the interstep portion 23 is disposed so as to cross the lead wire 12.

  The guide bridge 21 is disposed so as to straddle the labyrinth seal 22 and the interstage part 23. The guide bridge 21 is formed by bending a part of a metal tube. As the metal tube, for example, a SUS (stainless steel) tube having a diameter of 1.0 mm to 1.6 mm can be employed.

  Specifically, the guide bridge 21 includes a first leg portion 25 and a second leg portion 26 that are fixed to the surface of the disk 4, and a connection portion 27 that connects the first leg portion 25 and the second leg portion 26. These are formed by bending a single metal tube.

  The first leg portion 25 is formed so that one end opposite to the connection portion 27 is fixed to the surface of the disk 4 and the other end connected to the connection portion 27 is separated from the surface of the disk 4. . Similarly to the first leg portion 25, the second leg portion 26 has one end opposite to the connection portion 27 fixed to the surface of the disk 4 and the other end connected to the connection portion 27 at the surface of the disk 4. It is formed so that it may be separated from.

  As an example of the guide bridge 21, a guide bridge 21A for bypassing the labyrinth seal 22 will be described with reference to FIG. One end of the first leg portion 25 and the second leg portion 26 of the guide bridge 21 </ b> A is bent and fixed on the disk 4, and the other end is bent so as to exceed the height of the labyrinth seal 22. The first leg portion 25 and the second leg portion 26 are fixed by spot-welding the foil plate 28 to the flat portion of the disk 4. Further, the lead wire 12 is wound around the guide bridge 21 in a spiral shape and then fixed by an adhesive.

  As another example of the guide bridge 21, a guide bridge 21B for bypassing the interstage portion 23 will be described with reference to FIG. One end of the first leg portion 25 and the second leg portion 26 of the guide bridge 21B is curved and fixed on the disk 4, and the connecting portion 27 is connected to the first leg portion 25 so as to exceed the interstage portion 23. The second leg portion 26 is connected. In addition, the connecting portion 27 is bent in a crank shape for the purpose of improving the strength of the guide bridge 21.

  According to the above-described embodiment, the guide bridge 21 is installed at a portion where the interstage portion 23 and the labyrinth seal 22 that are the uneven portions are continuous, and the lead wire 12 is fixed to the guide bridge 21. Even when the surface treatment cannot be sufficiently performed or the temporary fixing of the lead wire 12 is difficult, the lead wire 12 can be reliably fixed. That is, the lead wire 12 can be reliably fixed even when it is difficult to hang the paper for surface treatment of the concavo-convex portion or when the lead wire 12 is difficult to adhere to the concavo-convex portion.

  The guide bridge 21 is not limited to the shape as shown in FIG. 3, but may have a shape as shown in FIG. That is, the first leg portion 25 and the second leg portion 26 do not need to be curved, and the connecting portion 27 may be formed with a plurality of bent portions. By forming a plurality of bent portions, the strength of the guide bridge 21 can be improved, and the lead wire 12 can be fixed more reliably.

Moreover, in the said embodiment, although demonstrated using the example using the strain gauge 10, the wiring apparatus 1 of the rotary body of this invention is applicable also to the wiring apparatus using other sensors, such as a thermocouple.
Further, in the above embodiment, the example using the rotating body composed of the turbine blade 5 and the disk 4 of the steam turbine has been described. However, the present invention is not limited to this, and the present invention is not limited to this. The present invention can be applied to an impeller and a rotating shaft of a centrifugal compressor.

DESCRIPTION OF SYMBOLS 1 Rotating body wiring apparatus 2 Rotating body 3 Rotor part (rotating shaft)
4 disc 5 turbine blade (member to be assembled)
9 Disc fitting part 10 Strain gauge 11 Body part 12 Lead wire (wiring)
21 Guide Bridge 22 Labyrinth Seal 23 Interstage 25 First Leg 26 Second Leg 27 Connection

Claims (2)

A wiring formed by twisting a plurality of single wires, arranged on the surface of a rotating body composed of a member to be assembled and a rotating shaft to which the member to be assembled is fixed, across the member to be assembled and the rotating shaft;
A first bonding portion for bonding the wiring on the surface of the member to be assembled onto the surface of the member to be assembled;
A second adhesive portion that is disposed at a distance from the first adhesive portion and adheres the wiring on the surface of the rotary shaft onto the surface of the rotary shaft;
A first leg portion and a second leg portion whose one end is fixed to the surface of the rotating body and the other end is separated from the surface of the rotating body, and a connecting portion that connects the first leg portion and the second leg portion. A guide bridge having
The wiring device for a rotating body, wherein the wiring is spirally wound around the guide bridge . The wiring device for a rotating body according to claim 1 , wherein the guide bridge is formed by bending a metal tube.

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