JP3615950B2 - Rotating body wiring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotating body wiring apparatus for laying a cable used for measuring vibration stress generated in a rotor blade serving as a rotating body in a rotary machine such as a gas turbine.
[0002]
[Prior art]
Conventionally, when measuring the vibration stress generated on a moving blade in a rotating machine such as a gas turbine, a strain gauge is attached to the moving blade, and a rotation side signal is transmitted wirelessly to a stationary recording device using a telemeter. The vibration stress generated on the rotor blade is measured.
[0003]
A gas turbine, which is an example of a rotating machine, forms a rotor unit by connecting a plurality of disks in the axial direction, and configures a rotating unit that rotates around an axis center 19 by fixing a moving blade to each disk. Yes.
[0004]
That is, FIG. 7 shows the third and fourth paragraphs as the main part of the rotating part in the gas turbine. Here, the third stage disk 34 is provided with the third stage rotor blade 32 on the outer periphery thereof, and the fourth stage. The disk 44 is provided with a fourth stage blade 42, and a bridging portion 13 is formed between the third stage disk 34 and the fourth stage disk 44 so as to face each other.
[0005]
7 is a thermocouple, 8 is a strain gauge, and the thermocouple 7 and the strain gauge 8 are arranged at predetermined positions of the fourth stage blade 42 in order to measure the vibration stress generated in the fourth stage blade 42 of the gas turbine. The MI cable (Metal Insulate cable) 2 that is connected to the thermocouple 7 and the strain gauge 8 is fixed by spot welding 4 or the like, and this is routed along the fourth stage disk 44 and connected to the transmitter 9. ing.
[0006]
Similarly, thermocouples and strain gauges are attached to the third stage moving blade 32 and the preceding stage moving blade (not shown), and the MI cable 2 for transmitting signals from them is indicated by a broken line in the figure. The transmitter 9 is connected via a bridging portion 13 formed between the paragraphs.
[0007]
An output signal from the strain gauge 8 or the like guided to the transmitter 9 by the MI cable 2 is transmitted as a VHF radio wave from the rotating transmission antenna 10, and this radio wave is transmitted to the receiver (not shown) via the stationary receiving antenna 11. Demodulation and vibration stress are recorded by a data recorder (not shown).
[0008]
Here, when the MI cable 2 is wired from the strain gauge 8 or the thermocouple 7 to the transmitter 9, for example, as shown in FIG. 7, a part of the third stage disk 34 and a part of the fourth stage disk 44 face each other. Grooves 5 as shown in FIGS. 8 and 9 are formed on the upper surfaces of the protruding portions 35 and 45 formed by overhanging, and wiring is performed while the MI cable 2 is held in the grooves 5.
[0009]
[Problems to be solved by the invention]
In the conventional apparatus as described above, the bridging operation of the MI cable 2 between adjacent paragraphs is particularly important. For example, vibration, heat, or centrifugation is performed at the bridging portion 13 between the third stage disk 34 and the fourth stage disk 44. There is a possibility that the bridged MI cable 2 may be disconnected or scattered due to elongation due to force or the like.
[0010]
Therefore, the inventors conducted a verification test of bridging between disks using the MI cable 2 under the same operating conditions as the actual machine in order to confirm the state of disconnection or scattering in the conventional apparatus described above.
[0011]
First, as shown by a solid line in FIG. 8 (b), the MI cable 2 arranged at the bridging portion 13 between the disks is bent toward the disk inner surface side (center side, axial center side) to provide a slack-like margin. Both ends were fixed to the disk by spot welding 4 using the pressing plate 3.
[0012]
When the MI cable 2 is rotated at a speed equivalent to the actual machine in this state, the MI cable 2 is bent as shown by the broken line in FIG. 8 due to the centrifugal force, and is cut by contacting the seal fins 20 disposed near the outer periphery. did.
[0013]
Next, as shown in FIG. 9, the SUS guide tube 16 passed through the MI cable 2 is passed between the projections 35 and 45 of the third stage disk 34 and the fourth stage disk 44, and the third stage disk 34 side is pressed. The plate 3 is pressed and fixed to the third stage disk 34 by spot welding 4, while the fourth stage disk 44 side holds the guide tube 16 by spot welding with the holding plate 3 but is movable in the axial direction. As a free support 23, measures against elongation in the axial direction were taken.
[0014]
When rotating at a speed equivalent to the actual machine in this state, the holding plate 3 in the free support 23 peels 21 due to heat, circumferential twisting, and centrifugal force, and a two-dot chain line in FIG. In some cases, the guide tube 16 is lifted up to come into contact with the seal fin 20 and cut.
[0015]
The present invention was made in view of the results of these demonstration tests conducted based on the operating conditions of the actual machine, and provides a wiring device for a rotating body that is strong against thermal stress and centrifugal force and has high stability. It is to be an issue.
[0016]
[Means for Solving the Problems]
The present invention has been made to solve the above-described problems, and at the bridging position formed between the rotating members facing each other with a certain interval in the axial direction, each has a certain angle with respect to the axial direction. Each one end face of the pair of guide tubes facing each other and disposed on each rotating member, the guide tube has a space having a flat cross section and is formed by cutting the opposite end obliquely along the longitudinal direction, And the wiring apparatus of the rotary body which has arrange | positioned the cable so that it can move with a margin with respect to the said flat space in the guide tube is provided.
[0017]
That is, according to the present invention, at the bridging position between the rotating members, the pair of guide tubes are arranged at a fixed angle with respect to the axial direction with the end faces facing each other, and the guide tubes are flat in cross section. A wiring device for a rotating body by arranging a cable so that the opposite end is cut obliquely along the longitudinal direction, and a cable is movably disposed inside the flat space with a margin with respect to the flat space. As a result, the cable has a degree of freedom to allow a certain movement, protects the cable against the influence of thermal stress and centrifugal stress generated at the bridging position, and prevents the cable from being disconnected or scattered. This is intended to prevent the problem and ensure the safety and stability of the device.
[0018]
Further, the present invention provides an end face of each of the pair of guide tubes having a constant angle with respect to the axial direction at a bridging position formed between the rotating members facing each other with a constant interval in the axial direction. The guide tube is arranged in a straight line on each of the rotating members, and the guide tube has a space with a flat cross section and is formed by cutting the opposite end obliquely along the longitudinal direction, and in the guide tube The present invention provides a wiring device for a rotating body in which a cable is arranged so as to be movable with a margin with respect to the flat space.
[0019]
That is, according to the present invention, at the bridging position between the rotating members, the pair of guide tubes have a fixed angle with respect to the axial direction with the end faces facing each other, and the other is arranged on the extension line of one guide tube. The guide tube has a space with a flat cross section, the opposite end is notched obliquely along the longitudinal direction, and has a margin for the flat space inside. By arranging the cable so that it can be moved and configuring the rotating body wiring device, the cable has a degree of freedom to enable a certain movement, and is affected by the effects of thermal stress, centrifugal stress, etc. generated at the bridging position. On the other hand, the cable is protected and accidents such as disconnection and scattering of the cable are prevented in advance, and a highly safe and highly stable wiring device is obtained.
[0020]
Furthermore, the present invention provides a wiring device for a rotating body in which the rotating member is a disk constituting an adjacent paragraph in a rotating machine such as a gas turbine.
[0021]
That is, according to the present invention, in a rotating machine such as a gas turbine, by placing a guide tube and passing a cable at a bridging position formed between adjacent disks that are the rotating part, heat in the bridging part, In addition, the occurrence of accidents such as cable disconnection or scattering due to the influence of centrifugal force and the like is prevented, and safety is increased and stability is increased when wiring a rotating machine such as a gas turbine.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS.
In the present embodiment, the same parts as those in the conventional one are denoted by the same reference numerals in the drawing, and the characteristic configuration in the present embodiment will be described with emphasis and overlapped with the conventional one. The explanation to do is omitted as much as possible.
[0023]
In other words, the present embodiment is a wiring structure of the bridging portion 13 formed between the third and fourth paragraphs in a gas turbine that is an example of a rotating machine. As shown in FIG. The pair of guide tubes 1 that are slightly curved in the direction are provided with a foil-like pressing plate 3 in the groove 5 provided in the protruding portion 35 formed on the third-stage disk 34 and the protruding portion 45 formed on the fourth-stage disk 44, respectively. The presser plate 3 is positioned by spot welding 4.
[0024]
When the guide tube 1 positioned in this way is viewed in a plan view as shown in FIG. 1, it can be exaggerated to say that the Chinese numeral “eight” shape or the katakana “ha” character. The mold is shaped so that one end in the longitudinal direction faces each other.
[0025]
And the front-end | tip part of this guide tube 1 forms the notch part 6 which notched diagonally half of the lower side along the longitudinal direction of the guide tube 1 as shown to Fig.3 (a). doing.
[0026]
Further, the guide tube 1 has a flat shape over its entire length, and as shown in FIG. 3 (b), the space formed therein also has a flat cross-sectional shape, and the MI cable is included in this space. 2 is arranged so that it can move up and down and right and left with a margin.
[0027]
As an example of the dimensions of the MI cable 2 so that the MI cable 2 can move with sufficient margin in the inner space of the guide tube 1, the inner diameter of the guide tube 1 is about It is preferable that the length is 4 mm and the length is about 30 mm.
[0028]
Further, as shown in FIG. 1, when the guide tube 1 is attached to the groove 5 provided in each projecting portion 35, 45, an appropriate angle: θ (30) with respect to the axial direction of the rotating machine (gas turbine). The cutting plane (end face) facing on the bridge side is parallel and the mutual distance d is, for example, 1 to 2 mm, and the MI cable 2 is connected to the guide tube 1. It is fixed at both outer ends.
[0029]
In the present embodiment configured as described above, when the rotor of the gas turbine, that is, the third-stage disk 34 and the fourth-stage disk 44, etc. rotate, the heat and the centrifugal force extend, and the relative displacement between the disks. For example, a local load is applied to the MI cable 2 disposed in the bridging portion 13, and centrifugal stress and thermal stress are generated in the MI cable 2 in the vicinity of the bridging portion 13.
[0030]
The relationship between the distance (fixed interval): L between the pair of opposing MI cables 2 (fixed interval): L and the centrifugal stress and the thermal stress is as shown in FIG. 5, and when the fixed interval: L is short On the other hand, the thermal stress 25 is large, while the centrifugal stress 26 shows the opposite tendency.
[0031]
Therefore, from this figure, the optimum fixing interval L of the MI cable 2 for minimizing the thermal stress 25 and the centrifugal stress 26 or within an allowable range in consideration of the balance between the thermal stress 25 and the centrifugal stress 26: L Can be decided.
[0032]
As described above, the guide tube 1 has a flat cross section and has a sufficient space with respect to the outer diameter of the MI cable 2, and is a combination having a backlash, and the guide tube 1 itself. Since it is slightly curved in the longitudinal direction, the MI cable 2 can freely move in the guide tube 1.
[0033]
In addition, since the guide tube 1 is inclined at a predetermined angle: θ with respect to the axial direction of the disc, the axial displacement is absorbed by the movement of the MI cable 2 in the circumferential direction, and the radial displacement is absorbed by the guide tube 1. And the guide tube 1 fixed by the presser plate 3 and the spot weld 4 against the centrifugal force.
[0034]
In addition, as shown with an arrow in FIG. 3, when the third stage disk 34 is relatively displaced radially outward and the fourth stage disk 44 is oppositely displaced radially inward, a difference occurs. The MI cable 2 can be bent with a margin by utilizing the relief by the notch 6 cut out in the longitudinal direction from the opposite end of the guide tube 1 and is not damaged by the presence of the guide tube 1.
[0035]
Furthermore, as shown by an arrow in FIG. 4, when the third stage disk 34 and the fourth stage disk 44 are twisted in the rotational direction, the guide tube 1 has a flat cross-sectional shape, and Since there is a sufficient margin between the outer diameter of the MI cable 2, the MI cable 2 can move left and right in the guide tube 1, and damage can be avoided.
[0036]
As described above, in the present embodiment, in the bridging portion 13, the guide tube 1 that has passed the MI cable 2 is flattened and slightly curved, and is inclined in the longitudinal direction toward the bridging portion 13 side of the guide tube 1. Since the notched portion 6 is provided and is further installed at a predetermined angle: θ with respect to the axial direction of the third stage disk 34 and the fourth stage disk 44, thermal stress, centrifugal stress, etc. As a result, an accident that the MI cable 2 is disconnected and scattered can be prevented in advance, and the safety and stability of the apparatus can be secured and maintained.
[0037]
Next, a second embodiment of the present invention will be described with reference to FIG.
Also in the present embodiment, the same parts as those in the above-described conventional one and the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
[0038]
In the present embodiment, the pair of guide tubes 30 respectively installed on the protruding portions of the third stage disk 34 and the fourth stage disk 44 are arranged on the same straight line with the other arranged on the extension line of one. In this case, the third stage disk 34 and the fourth stage disk 44 are inclined at a predetermined angle: θ.
[0039]
Accordingly, each guide tube 30 extends linearly without being bent by itself, but has a flat shape as a whole, and a notch 6 is formed in the longitudinal direction on the lower surface side at the opposite end. doing.
[0040]
Each guide tube 30 is fixed to each of the third stage disk 34 and the fourth stage disk 44, and the position of the MI cable 2 is fixed by the holding plate 17 outside the end of the guide tube 30 on the isolation side. The MI cable 2 can move with a margin relative to the guide tube 30 in the guide tube 30 and at the opposite end.
In the present embodiment configured as described above, when the third stage disk 34, the fourth stage disk 44, and the like rotate, the displacement in the axial direction is such that the guide tube 30 is flattened and the axial direction is changed. Since it is installed at a predetermined angle: θ, the guide tube 30 can be flattened to absorb the movement in the axial direction with a margin, and the remaining effects are those of the first embodiment. It is the same.
[0041]
That is, according to the present embodiment, the linear guide tube 30 that has passed through the MI cable 2 is flattened, and the linear guide tube 30 that has the notch 6 obliquely along the longitudinal direction is the third guide tube 30. Accidents such as disconnection or scattering of the MI cable 2 due to the influence of heat, centrifugal force, etc. in the bridge portion 13 because the installation is performed at a predetermined angle: θ inclined with respect to the axial direction of the stage disk 34, the fourth stage disk 44, etc. It is possible to obtain a highly stable and highly stable wiring device.
[0042]
Although the present invention has been described with reference to the illustrated embodiment, the present invention is not limited to this embodiment, and it goes without saying that various modifications may be made to the specific structure within the scope of the present invention. Absent.
[0043]
For example, in the above-described embodiment, the bridging portion between the third and fourth paragraphs of the gas turbine has been described. However, the present invention is not limited to this, and can be applied to a bridging portion between other paragraphs. Is.
[0044]
Moreover, although the wiring of the MI cable of the rotating body has been described, it goes without saying that the present invention can also be applied to the wiring of cables that are constructed using general equipment other than the rotating body and ducts of equipment.
[0045]
【The invention's effect】
As described above, according to the present invention, a pair of guides each having a constant angle with respect to the axial direction at the bridging position formed between the rotating members facing each other with a constant spacing in the axial direction. Each one end face of the tube faces each other and is arranged on each rotating member. The guide tube has a space with a flat cross section and is formed by cutting the opposite end obliquely along the longitudinal direction. Since the cable is arranged in the tube so that it can move with a margin with respect to the flat space, the wiring device of the rotating body is configured. The cable is protected against the effects of thermal stress, centrifugal stress, etc. generated at the bridge position, preventing accidents such as disconnection and scattering of the cable, and improving the safety and stability of the device. Securing sex Those that could be achieved.
[0046]
According to the invention of claim 2, the pair of guide tubes having a constant angle with respect to the axial direction at a bridging position formed between the rotating members facing each other with a constant spacing in the axial direction. The guide tube has a space with a flat cross section and is formed by cutting the opposite end obliquely along the longitudinal direction, The cable is arranged in the guide tube so that it can move with a margin with respect to the flat space, so that the rotating device wiring device is configured. The cable is protected against the effects of thermal stress and centrifugal stress generated at the bridging position, preventing accidents such as disconnection and scattering of the cable, and is highly safe and stable. Get an excellent wiring device It is what could be.
[0047]
Furthermore, according to the invention of claim 3, since the rotating member is configured as a disk that constitutes an adjacent stage in a rotating machine such as a gas turbine, the rotating body wiring device is configured. By placing a guide tube at the bridging position formed between adjacent disks, which are the rotating parts, and passing the cable, accidents such as cable disconnection or scattering due to the effects of heat and centrifugal force at the bridging part This makes it possible to obtain a rotating machine such as a gas turbine that is highly practical and secures the stability of the apparatus by preventing the occurrence of the above, improving the safety when wiring the rotating machine such as a gas turbine.
[Brief description of the drawings]
FIG. 1 is a plan view showing a main part of a rotating body wiring device according to a first embodiment of the present invention;
FIG. 2 is a side view of that of FIG.
3A and 3B are diagrams illustrating a state during operation in the embodiment of FIG. 1, wherein FIG. 3A is an explanatory diagram illustrating a situation viewed from its side surface, and FIG. 3B is an explanatory diagram illustrating a cross-section taken along line III-III in FIG. is there.
FIG. 4 is an explanatory view showing another aspect during operation in the embodiment of FIG. 1;
FIG. 5 is an explanatory diagram showing a relationship between a cable fixing interval, thermal stress, and centrifugal stress in the embodiment of FIG. 1;
6A and 6B show a main part of a rotating body wiring device according to a second embodiment of the present invention, in which FIG. 6A is a plan view thereof, and FIG. 6B is an explanatory view showing an excerpt of the main part of FIG. is there.
FIG. 7 is an explanatory diagram showing a situation in which a main part of a rotating part of a conventional gas turbine is measured.
FIGS. 8A and 8B show an example of a bridging portion of an adjacent paragraph, which is a main part in FIG. 7, where FIG. 8A is a plan view and FIG. 8B is a side view of FIG.
9 shows another example of a bridging portion of an adjacent paragraph, which is a main part in FIG. 7, in which (a) is a plan view and (b) is a side view of (a).
[Explanation of symbols]
1 Guide tube 2 MI cable 3 Holding plate 4 Spot welding 5 Groove 6 Notch portion 7 Thermocouple 8 Strain gauge 9 Transmitter 10 Transmitting antenna 11 Receiving antenna 13 Bridge portion 16 Guide tube 17 Holding plate 18 Disk end 19 Axis center 20 Seal Fin 21 Separation 23 Free support 25 Thermal stress 26 Centrifugal stress 30 Guide tube 32 Third stage rotor blade 34 Third stage disk 35 Projection part 42 Fourth stage rotor blade 44 Fourth stage disk 45 Projection part

Claims (3)

In the bridging position formed between the rotating members facing each other with a certain interval in the axial direction, the one end surfaces of the pair of guide tubes each having a certain angle with respect to the axial direction are opposed to each other. The guide tube is disposed on each rotating member, and the guide tube has a flat cross-sectional space and is formed by notching the opposite end obliquely along the longitudinal direction. In addition, the rotating body wiring device is characterized in that the cables are arranged to be movable with a sufficient margin. At the bridging position formed between the rotating members facing each other with a certain interval in the axial direction, each of the end surfaces of the pair of guide tubes having a certain angle with respect to the axial direction is opposed to each other. The guide tube is linearly arranged on the rotating member, and the guide tube has a flat cross-sectional space and is formed by cutting the opposite end obliquely along the longitudinal direction, and the flat tube has the flat space in the guide tube. A wiring device for a rotating body, characterized in that a cable is arranged so as to be movable with a margin. 3. The rotating body wiring device according to claim 1, wherein the rotating member is a disk constituting an adjacent paragraph in a rotary machine such as a gas turbine.

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