JPH0894432A - Mounting device of detector for measurement of rotor vibration - Google Patents

Abstract

PURPOSE: To easily adjust the interval between a detector and a rotor regarding the mounting device of the detector used to measure the rotor vibration in a noncontact manner. CONSTITUTION: Rotational-signal-detector mounting plates 21a, 21b are attached to two split support rings 20a, 20b. A rotational-signal detector 10 and a noncontact displacement meter 11 are attached to the mounting plates 21a, 21b so as to keep a definite interval from a rotor. The support rings 20a, 20b are fixed to a foundation base board 23 via rail surface plates 35, sliding rails 32b and fitting parts. The mounting plates 21a, 21b are sandwiched between the support rings 20a, 20b from both sides by means of inclination adjusting bolts 22. The direction of a rotary shaft is adjusted on the sliding rails 32b, and its inclination is adjusted by beams of the inclination adjusting bolts 22 in such a way that an interval is adjusted. A change in the interval during a rotation can be measured by the displacement meter 11. As a result, a mounting device can be adjusted and measured easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration measuring detector mounting device for mounting a detector for measuring the vibration of rotors such as turbines, pumps and fans in a non-contact manner.

[0002]

2. Description of the Related Art FIG. 4 is a side view showing the relationship between a conventional rotor and a rotation signal detector. In the figure, a plurality of rotary blades 1 such as a turbine are arranged on a disk portion 2 of a rotary shaft 3 at equal intervals in the circumferential direction. In the rotor blade vibration measuring device that is the subject of the present invention, a large number of rotation signal detectors 10 such as electromagnetic rotor pulse detectors are installed in the circumferential direction on the stationary side facing the tip of the rotor blade 1.

FIG. 5 is a system diagram of this rotary blade vibration measuring device. The rotor blade vibration measuring device has an adjacent rotation signal detector 1
Using the output signals A ₁ and A ₂ of 0 as gate signals, the same number of circuits as the rotation signal detector 10 are provided to count the number of transmissions of the high frequency reference signal transmitter 4 of several hundred megahertz from several tens of megahertz. There is.

In the rotor blade vibration measuring device having such a configuration, the rotation signal detector 10 detects a rotation signal every time the rotor blade 1 passes in front of the rotation signal detector 10. From this rotation signal, it is possible to obtain the instantaneous speed of the rotor 1 by counting the time for the arbitrary rotor 1 to pass between the two adjacent rotation signal detectors 10 as the number of times of transmission of the reference signal transmitter 4. it can.

By attaching the rotation signal detectors 10 at equal intervals on one circumference and equipping the same number of counters 5 with each other, it is possible to obtain the instantaneous speed of the rotor 1 at all positions on the circumference. This instantaneous speed includes the same rotation speed as one rotation of the rotary shaft and the vibration speed due to the vibration of the rotor 1, and subtracts the rotation speed obtained as an average value to obtain the vibration component of the rotor 1. You can

[0006]

When an electromagnetic rotary pulse detector is used as a rotary signal detector in the conventional rotor blade vibration detection, the mounting gap with the rotary blade is 5 mm.
Less than about 0.5mm variation in mounting gap between each detector
It is necessary to hold down to a certain degree. In the case of the turbine blade 1, a large one has a diameter of 4 m to 5 m, which means that a ring-shaped rotation signal detector mounting jig is used. However, after installing the turbine and the mounting jig, the detectors 10 are mounted one by one. It is a place where workability is poor and it takes an enormous amount of work time.

During operation, the rotating shaft 3 thermally expands as the temperature rises, and contracts due to the rotating centrifugal force. The amount of expansion and contraction is a few mm, which causes a change in the gap between the rotation detector 10 and the rotary blade 1. If too close, there is a risk of contact and damage to the rotary blade 1 and rotation detector 10, and if too far away, detection There is a problem that signal reliability is reduced.

[0008]

In order to solve the above problems, the present invention adjusts the interval by sliding the surface of the stationary detector mounting plate facing the rotor blade in the axial direction of the rotor blade. Means, means for inclining the axis of the surface of the mounting plate facing the rotary blade, and means for measuring the distance between the surface of the plate with plate and the rotary blade are provided.

That is, according to the present invention, the rotor blade vibration is generated by a plurality of rotation signal detectors circumferentially arranged on a stationary-side detector mounting plate facing the rotor blade at a constant interval. A rotary blade vibration measuring detector mounting device for measuring, wherein a surface of the detector mounting plate facing the rotary blade is slid in a rotation axis direction of the rotary blade to adjust the interval, and the detector mounting A means for adjusting the inclination of the interval by inclining the axis of the plate with respect to the axial direction of the rotary blade; and means for measuring a gap between the detector mounting plate and the rotary blade. A detector mounting device for measuring the characteristic of a rotor blade vibration is provided.

[0010]

According to the present invention, the rotation signal detectors are arranged on the detector mounting plate at equal intervals on the circumference by such means, and the detection ends of all the detectors are equal to the end face of the detector mounting plate. Mount so that there is a distance. Such a detector mounting plate is installed on the foundation table on which the measurement is carried out with a certain distance from the rotor blades. For example, a support ring or the like may be installed in the upper half and the lower half.
If it is divided and incorporated, it can be easily installed on the base bed in the order of the lower half, the rotor, and the upper half. Next, slide the detector mounting plate by means of sliding means, for example, by installing a rail on the base table, and then provide a fitting part of this rail on the detector mounting plate, and slide the detector mounting plate on this rail. Then, slide the mounting plate in the direction of the rotation axis of the rotor blade to adjust the gap to the set value, and after adjustment, fix it to the foundation bed with bolts, etc. it can.

Further, the relative positional relationship between the detector mounting plate and the rotary blade is adjusted by the tilt adjusting means. This is because, for example, the detector mounting plate is provided with tilt adjusting bolts at various places on the circumference, and by rotating this bolt, the detector mounting plate is fixed so that the clearances between all the rotation signal detectors and the rotor blades become constant. It is possible by adjusting the inclination of.

When such adjustment is completed, the rotor is rotated to start the operation. During operation, the gap between the rotor and the rotor is constantly monitored by the measuring means attached to the detector mounting plate, for example, the displacement gauge. When the distance between the detector and the rotary blade changes due to thermal stress or the like, the adjustment can be performed immediately.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view of a detector mounting device for rotor blade vibration measurement according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is a detailed sectional view of a portion B in FIG. is there.

In FIG. 1, a support ring 20a, 20b and a rotation signal detector mounting plate 21a, 21b which are divided into two are attached to a base platform 23 installed on a driver's platform 24. Several sets of tilt adjusting bolts 22 are attached to the support rings 20a, 20b as means for adjusting the tilt of the rotation signal detector mounting plates 21a, 21b supported by the support rings 22.

The rotation signal detectors 10 are attached to the rotation signal detector mounting plates 21a and 21b at equal intervals around the circumference, and the non-contact displacement gauge 11 is attached to the upper half 21a and the lower half 21b of the mounting plates.
Installed on each.

FIG. 2 is a sectional view taken along the line AA of FIG.
a and the rotation signal detector mounting plate 21a have a fitting structure, and the peripheral position of the rotation signal detector mounting plate 21a is fixed to the support ring 2
It is supported from both sides by the tilt adjusting bolts 22a and 22b attached to 0a.

Around the rotation signal detector mounting plate 21a,
Rotation signal detectors 10 are installed at equal intervals so as to face the rotary blades 1, and non-contact displacement gauges 11 such as laser displacement gauges are attached.

FIG. 3 is an enlarged sectional view of the portion B of FIG.

The upper half portion 21a and the lower half portion 21b of the rotation signal detector mounting plate are connected at their flanges with bolts 30. The upper half portion 20a and the lower half portion 20b of the support ring are also connected by bolts 31 at their respective flange portions.

The base table 23 has a slide rail 32b as a slide adjusting means, a rail surface plate 35, and a slide rail fitting portion 32a provided on the surface plate 35, and is provided on the mounting surface of the lower half portion 20b of the support ring. Sliding rail fitting part 32
After aligning a and the sliding rail 32b, the foundation table 2 is fixed by the rail surface plate mounting bolt 33 and the rail surface plate plug 34.
Fixed to 3.

Next, in an embodiment having such a configuration,
From the end surface of the rotation signal detector mounting plate 21, the rotation signal detector 1
After the rotation signal detector 10 is mounted on the circumference such that the tips of 0 are equidistant, the entire mounting jig is installed on the cab base 24, and the sliding rail 32 and the rail surface plate 35 are used to rotate the rotor blades. 1 is determined in the axial direction, the tilt adjusting bolts 22a and 22b are rotated from both sides, and the gap between the rotation signal detector 10 and the rotary blade 1 is adjusted to a set value.

Further, after such adjustment, the rotary blade is rotated, and the gap between the rotary blade 1 and the rotating blade 1 can be constantly monitored by the non-contact displacement meter 11 by means of a display device (not shown) or the like. If the gap between the vessel and the rotor is abnormal, it can be corrected immediately.

To summarize the configuration of the embodiment described in detail above, in the rotation signal detector attachment jig of the rotor blade vibration measuring apparatus, the attachment plate 21 for attaching the rotation signal detector 10 and the support for supporting the attachment plate 21. And a support ring 20.
Is attached to the base table 23.

The mounting surfaces of the support ring 20 and the base table 23 are mounted on the base table 23 by a mechanism for sliding the support ring 20 in the axial direction of the rotary blade 1 along the sliding rails 32b on the base table 23. Support ring 20 and foundation base 2 by rail surface plate 35 of
It has a mechanism for fixing 3.

The rotation signal detector mounting plate 21 has a shape in which its outer periphery is fitted into the support ring 20 and is fixed from the support ring 20 by a pair of bolts 31.

Rotation signal detector mounting plate 21 and support ring 20
Both have a two-part structure of upper half portions 20a, 21a and lower half portions 20b, 21b. The rotation signal detector mounting plate 21 has a non-contact type displacement gauge 11 such as a laser displacement gauge on the upper half portion 20a and the lower half portion 20b, respectively. Is mounted at a position facing the rotor blade shroud portion.

According to the embodiment having such a configuration, the rotary blade 1
It is possible to significantly reduce the number of installation steps of the vibration measuring device. As a result, the overall assembly process can be significantly shortened.

Further, by constantly monitoring the gap between the rotating blade 1 and the rotation signal detector mounting plate 21 by the non-contact displacement gauge 11, the gap between the rotating blade 1 and the rotor blade 1 is changed by heat or rotary centrifugal force. Therefore, the rotation signal can be detected safely and accurately.

[0029]

As described above in detail, in the present invention, means for sliding the surface of the stationary detector mounting plate facing the rotary blade in the direction of the rotary axis of the rotary blade to adjust the interval. And a means for inclining the shaft of the mounting plate facing the rotary blade, and a means for measuring the distance between the surface of the detector mounting plate and the rotary blade, the following effects can be obtained. It is a thing.

(1) The number of man-hours for mounting the rotor blade vibration measuring device can be greatly reduced. As a result, the overall assembly process can be significantly shortened.

(2) By constantly monitoring the clearance between the rotating blade and the rotating blade with the clearance measuring means, it is possible to understand that the clearance between the rotating blade and the rotor changes due to heat or rotational centrifugal force. Can be detected.

[Brief description of drawings]

FIG. 1 is a front view of a rotor blade vibration measuring detector mounting device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is an enlarged cross-sectional view of a B part in FIG.

FIG. 4 is a side view showing a positional relationship between a conventional rotary blade and a rotation signal detector.

FIG. 5 is a general system diagram of a rotor blade vibration measuring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor 10 Rotation signal detector 11 Non-contact displacement meter 20 Support ring 21 Rotation signal detector mounting plate 22 Tilt adjustment bolt 23 Foundation bed 24 Driving bed 30 Bolt 31 Bolt 32 Sliding rail 33 Rail surface plate mounting bolt 35 Rail Surface plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryoichi Sonoda 1-1, Atsunouramachi, Nagasaki City Mitsubishi Heavy Industries Ltd. Nagasaki Shipyard (72) Inventor Yoji Morita 1-1, Atsunouracho Nagasaki City Mitsubishi Heavy Industries Ltd. Nagasaki Shipbuilding Co., Ltd. In-house

Claims (1)

[Claims] 1. A rotary blade which measures a rotary blade vibration by a plurality of rotation signal detectors circumferentially arranged on a stationary-side detector mounting plate facing the rotary blade with a constant interval. In the vibration measuring detector mounting device, a means for sliding the surface of the detector mounting plate facing the rotary blade in the rotational axis direction of the rotary blade to adjust the interval, and a shaft of the detector mounting plate. Rotation, comprising means for adjusting the inclination of the interval by inclining with respect to the axial direction of the rotary blade, and means for measuring a gap between the detector mounting plate and the rotary blade. Detector mounting device for blade vibration measurement.