JP3117388B2 - Rotational vibration stress measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention, a steam turbine, gas turbine, the rotational vibration stress measuring device applied to the measurement of the vibration stress generated in the rotor blade of a rotary machine such as a pump, particularly,
Caused by drain attacks generated by these rotating machines
In addition to easy separation of strain gauges, insulation due to inflow of drain
Prevents defects and sends output signals due to loose screws, etc.
Rotational vibration stress measurement device that does not interfere with reception
About the installation .

[0002]

2. Description of the Related Art Conventionally, when measuring vibration stress generated on a moving blade of a steam turbine, a gas turbine, a pump, or the like, a strain gauge is attached to the moving blade, and a signal on a rotating side is transmitted to a stationary side using a telemeter. To measure the vibration stress generated on the rotor blade.

FIGS. 5 to 7 show these conventional measuring devices. FIG. 5 shows a rotary machine, that is, a strain gauge attached to a moving blade portion of a steam turbine, and FIG. Perspective view, (b) is a side sectional view near the transmitter capsule,
FIG. 6 is an enlarged view of the strain gauge protection plate 1 of FIG. 5A, and FIG. 7 is a side sectional view of the transmitter capsule 6 of FIG. 5B.

That is, a strain gauge 2 protected by a strain gauge protection plate 1 is attached to the moving blade 11 in order to measure the vibration stress generated in the moving blade 11 of the steam turbine, and the lead wire 3 is connected to the moving blade 11 by the lead wire 3. It is laid on the disk 13 and connected to the transmitter capsule 6 shown in FIG. Further, an output signal of the strain gauge 2 guided to the transmitter capsule 6 by the lead wire 3 is transmitted as a radio wave in the VHF band from the transmitting antenna 7 on the rotating side, and the radio wave is transmitted via the receiving antenna 12 on the stationary side to the receiver (shown in the drawing). (Not shown) and the vibration stress is recorded by a data recorder (not shown).

[0005]

The conventional rotary vibration stress measuring apparatus has the following problems to be solved. In other words, in a conventional vibration stress measuring device for a rotating machine, a high-speed rotation such as a steam turbine, a gas turbine, and the like, in order to measure the vibration stress and the like of the moving blade under a set steam condition,
Strain gauge protection plate 1 fixed by spot welding 4 as shown in FIG.
In this case, there is a problem in that water droplets, steam, and the like flow into the inside, impact the strain gauge 2 to generate a very intense drain attack 14, and the strain gauge 2 is liable to peel off or cause insulation failure.

[0007] As shown in FIG. 7, water droplets, steam, and the like similarly enter the transmitter capsule 6.
And, Rutotomoni rotation occurs drain attack 14, the rotor blades or the like, screw loosening, there is also a problem that the transmission of the output signal from the strain gauges 2 may interfere.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has been stable at a high speed for a long period of time without peeling of a strain gauge or insulation failure even under a tight steam condition. It is an object of the present invention to provide a rotational vibration stress measurement device that prevents drain attack for measurement.

[0008]

SUMMARY OF THE INVENTION The present invention seeks to provide a rotational vibration stress measuring device as means for solving the above-described problem, then according.

[0009] A strain gauge is attached to a measurement target portion inside the rotating machine rotating with high-pressure steam in a watertight manner by covering with a strain gauge protection plate, and a lead wire is drawn out from the strain gauge and semi-buried in another portion of the rotating machine. In the rotational vibration stress measuring device connected to the transmitter in the transmitter capsule and transmitting the strain signal from the strain gauge from the transmitter and receiving by another receiver to measure the rotational vibration stress, the transmitter capsule and the transmitter capsule are semi-embedded. An L-shaped waterproof plate that surrounds the boundary with the rotating machine and is seam-welded to a joint surface including each end face of the transmitter capsule side and the rotating machine side so as to be watertight, and a housing section for the transmitter capsule and the transmitter. A rotation comprising an O-ring interposed in a watertight manner at a boundary with the lid to be covered. Dynamic stress measurement device.

[0010]

The present invention is configured as described above and has the following effects.

[0011] In the above configuration, the boundary between the transmitter capsule and the rotary machine half-buried with the transmitter capsule is surrounded , and the joint surface including each end face between the transmitter capsule side and the rotary machine side is made watertight. Since a waterproof plate with an L-shaped cross section is seam-welded, the outer periphery of the transmitter capsule is entirely surrounded by seam welding of the L-shaped waterproof plate, and water droplets, steam, etc., flow between the transmitter capsule and the rotating machine. Without the transmitter capsule, and therefore the transmitter, there is no drain attack.

Further, since an O-ring is provided at the boundary between the transmitter capsule and the lid covering the housing of the transmitter, the O-ring is provided in a watertight manner, so that water droplets, steam, etc. do not flow into the housing of the transmitter. There is no drain attack.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows the vibration of a measurement symmetrical portion inside a rotating machine .
The dynamic stress is measured, this embodiment of times a distortion signal corresponding thereto
Cover the strain gauge 2 output to the rolling vibration stress measuring device
Digit strain gauge protective plate enlarged perspective view of such 1, 2 is an enlarged perspective view of such a transmitter capsule 6 according to the present embodiment (however, shown in longitudinal) side such as a transmitter capsule 6 shown in FIG. 3 FIG. 2 FIG. 4 is a sectional view, and FIG. 4 is a lead wire 3 connecting between the strain gauge 2 of FIG. 1 and the transmitter 9 shown in FIG.
FIG. 6 is a partial perspective view of a state in which the holding member 16 is held at a required position on the rotating machine side by a holding metal fitting 16. A schematic diagram of the entire embodiment is almost the same as FIG.

The same components as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted unless necessary.

In FIG. 1, reference numeral 5 denotes seam welding in which the outer periphery of the strain gauge protection plate 1 fixed to the moving blade 11 of the rotary machine by spot welding 4 is further welded to the moving blade 11 in a watertight manner. Other configurations are the same as those in FIG. 6 of the conventional example as far as FIG. 1 is concerned.

Next, the operation of the above configuration will be described.

[0018] In FIG. 1, is mounted on the rotor blade 11, moving blade
A strain gauge 2 for detecting a strain generated in the strain gauge 11 is hardened with an adhesive and covered with a stainless steel strain gauge protection plate 1 having a thickness of 0.1 to 0.2 mm. 4 and the periphery thereof is fixed to the rotor blades 11 by seam welding 5. In the seam welding 5, a small amount of build-up weld is formed by applying a current to the welding agent inserted into the weld, and the strain gauge protection plate 1 has little thermal deformation and has no influence on the base material. Further, by performing continuous welding, it is possible to prevent moisture from entering the strain gauge protection plate 1 and also prevent the drain attack 14.

2 and 3, reference numeral 8 surrounds the boundary between the transmitter capsule 6 and the rotating machine, that is, the disk 13 at the base of the rotor blade 11, and includes a joint including each end face of the transmitter capsule 6 and the disk 13. An L-shaped waterproof plate 17 whose surface is water-tightly fixed by seam welding 5 is an O-ring 17 water-tightly interposed at the boundary between the transmitter capsule 6 and the lid 6 a covering the housing of the transmitter 9.

Reference numeral 10 denotes a transmitter capsule 6
Is fixed by L-shaped waterproof plate 8 and seam welding 5,
In consideration of vibration, a set screw provided to generate a press-contact 15 between the male screw of the transmitter capsule 6 and the female screw of the disk 13 to prevent looseness between them,
It is not used when (the main body of) the transmitter capsule 6 is assembled and attached in advance together with the lid 6a.

Next, the operation of the above configuration will be described.

The transmitter 9 is mounted in the transmitter capsule 6 and this capsule is
Screwed into. Measurement of rotating machinery is performed at high speed,
In addition, since the blade vibration stress is measured under the tightening steam condition, as shown in FIG. 3, a press-contact 15 is generated in the screw groove by the set screw 10 to further completely prevent the vibration. Further, the portion where the transmitter capsule 6 is exposed from the disc 13
As described above, for example, a stainless steel L-shaped waterproof plate 8 having a thickness of 0.1 to 0.2 mm is circumferentially wound,
, And further sealed by the O-ring 17, so that moisture does not enter between the transmitter capsule 6 and the disk 13 or into the transmitter capsule 6, thereby preventing a drain attack.

FIG. 4 shows an example in which spot welding 4 is applied to the presser fitting 16 for protecting the lead wire 3 and then seam welding 5 is applied. Is done.

As described above, according to the present embodiment , the boundary between the transmitter capsule 6 and the disk 13 is surrounded by the L-shaped waterproof plate 8, the seam welding 5 is performed, and the transmitter capsule 6 (specifically, its main body) The O-ring 17 is interposed at the boundary between the transmitter capsule 6 and the lid 6a.
There is an advantage that the transmitter 9 always operates normally because water droplets and vapor do not flow between the disk 9 and the disk 13 or into the transmitter 9 accommodating portion, so that drain attack does not occur.

The main body of the transmitter capsule 6 is first set (screwed) on the disk 13 and the set screw 1 is set.
0, when the screw portion of the disk 13 and the transmitter capsule 6 is relatively moved in the axial direction, a pressure contact 15 is generated and the transmitter capsule 6 (therefore, the transmitter 9) is pressed.
Has the advantage that vibrations are even more completely suppressed.

[0026]

The present invention has the following effects because it is configured as described above.

That is, according to the present invention, the boundary between the transmitter capsule and the rotary machine is wound with an L-shaped waterproof plate, seam welded, and the O-ring is interposed at the boundary between the transmitter capsule and the lid. It is protected from attack, and the strain gauge protection plate does not peel or the strain gauge is not damaged. Further, since moisture does not enter the inside of the transmitter capsule, the output signal of the vibration stress can be transmitted stably for a long time.

[Brief description of the drawings]

Fig. 1 Detects rotor blade distortion and sends distortion signal to transmitter
An enlarged perspective view of a strain gauge protection plate or the like in which the output strain gauge is coated in a watertight manner ,

FIG. 2 shows an embodiment of a rotational vibration stress measuring apparatus according to the present invention .
Cross-sectional perspective view of a transmitter capsule Te,

FIG. 3 is a side sectional view of the transmitter capsule of FIG. 2;

FIG. 4 is a perspective view of a holding member for a lead wire according to the embodiment.

5 (a) is a perspective view of the entire main part, FIG. 5 (b) is a side sectional view of the main part, and FIG.

FIG. 6 is a perspective view of a conventional strain gauge protection plate 1 and the like;

FIG. 7 is a side sectional view of a conventional transmitter capsule.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Strain gauge protection plate 2 Strain gauge 3 Lead wire 4 point welding 5 Seam welding 6 Transmitter capsule 6a Lid 7 Transmitting antenna 8 L-shaped waterproof plate 9 Transmitter 10 Set screw 11 Rotating blade 12 Receiving antenna 13 Disk 16 Holder 17 O-ring

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ identification code FI G08C 17/02 G08C 17/00 B (58) Field surveyed (Int.Cl. ⁷ , DB name) G01L 1/00 F01D 25 / 00 F02C 7/00 G01H 17/00 G01L 5/00 G08C 17/02 G01M 19/00

Claims (1)

(57) [Claims] 1. A strain gauge is attached to a measurement target portion inside a rotating machine rotating with high-pressure steam in a watertight manner with a strain gauge protection plate, and a lead wire is drawn out from the strain gauge to form a rotating machine.
The transmitter inside the transmitter capsule half-buried in another part
Connected to a transmitter to transmit the strain signal from the strain gauge.
In a rotational vibration stress measuring device for transmitting from a transmitter and receiving by another receiver to measure rotational vibration stress, the transformer
Semi-embedded transmitter capsule and transmitter capsule
Around the boundary with the rotating machine
Includes the end faces of the transmitter capsule side and the rotating machine.
The seam-welded section of the joint surface is L-shaped
Waterproof plate, the transmitter capsule and the transformer
Watertightly interposed between the lid and the cover that covers the housing of the transmitter
A rotational vibration stress measuring device comprising: an O-ring .