JPH0618351A - Umbalance measuring device for water wheel runner - Google Patents

Abstract

PURPOSE:To obtain an umbalance measuring device which does not require a gap at the center part vacancy in water wheel, drastically reduces attaching and detaching work and measures the umbalance simply and automatically. CONSTITUTION:The spherical seat 7 of a spherical static pressure bearing 5 is connected to a crane 18 by way of a spherical seat fixing flange 11, a bolt B15, a hanging metal part 16 and a hook 19. A put body 6 of the spherical static pressure bearing 5 is connected to a measured object water wheel runner 1 by way of a mount fixing flange 9, bolt A4 and a water wheel runner fixing flange 3. An oil pressure pump 23 for sending oil to the oil groove 8 in the sperical static pressure bearing 5 is placed. On the water wheel runner fixing flange 3, an electron type inclinometer such as an electron type inclinometer A24 is put.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static unbalance measuring device for a water turbine runner.

[0002]

2. Description of the Related Art A typical example of a conventional unbalance measuring device for a water turbine runner is disclosed in Japanese Utility Model Laid-Open No. 3-6543. The upper end is fixed to the bottom surface of the spherical seat of the spherical hydrostatic bearing, the lower end is fixed to the floor surface, and the columns for mounting the spherical hydrostatic bearing are installed. The turbine runner to be measured is placed and the static unbalance measurement of the turbine runner is performed.

The turbine runner is mounted on the spherical hydrostatic bearing in the following manner. That is, the water turbine runner to be measured is hoisted above the spherical hydrostatic bearing using a wire rope or hoisting metal, and then gradually lowered. In this case, in order to allow the water turbine runner to descend without hitting the spherical hydrostatic bearing or the column on which the hydrostatic bearing is mounted, a hole-like void is provided in advance in the center of the water turbine runner. .

As the water turbine runner continues to descend, the water turbine runner mounting flange fixed to the main shaft mounting surface of the water turbine runner contacts the mounting body mounting flange fixed to the upper surface of the mounting body. In this way, the water turbine runner is mounted on the spherical hydrostatic bearing.

When measuring the unbalance amount of the water turbine runner, pressure oil is supplied to the spherical hydrostatic bearing to form an oil film between the spherical seat and the mounting body, and the mounting body is floated above the oil film. Let
A method of measuring the inclination angle of the water turbine runner that inclines with the mounting body with respect to the spherical seat, and a counter weight method of further determining the weight of the counter weight added to the water turbine runner so that this inclination angle becomes zero. is there.

Further, there is a rotary unbalance amount detecting method in which the water turbine runner is rotated at a speed of 100 rpm or more to measure the strain generated in the bearing portion and the unbalance amount of the water turbine runner is measured from the strain amount. .

[0007]

In the conventional unbalance measuring device, when the water turbine runner is mounted on the spherical hydrostatic bearing, as described above, the central portion of the water turbine runner is the spherical hydrostatic bearing and the spherical hydrostatic bearing. In order to pass through the pillar part where is installed,
It was necessary to remove the central part of the turbine runner that interferes with these, or to determine the outer diameter of the column according to the gap in the central part of the turbine runner.

That is, since the outer diameter of the prop is determined according to the weight of the turbine runner and the length of the prop, the imbalance measurement is limited to a turbine runner having a gap in the center through which the prop can pass. Was there.

Therefore, it has been impossible in the past to measure unbalance with a Kaplan runner or a Francis runner, which has a rotary cone shape and has no void in the central portion.

In addition, it is necessary to frequently attach and detach the wire rope and the hanging metal fittings to attach and detach the water turbine runner to and from the unbalance measuring device. There was a safety issue.

In addition, when the counterweight method is used, it is necessary to perform muscular work to attach the counterweight to the water turbine runner, and it is necessary to judge from the tilt angle of the watermill runner to determine which position and how much the counterweight is attached. It takes a lot of time to do this by trial and error.

On the other hand, the rotary unbalance amount detecting method requires a rotating device for the water turbine runner, but this equipment is expensive.

An object of the present invention is to provide an unbalance measuring device capable of simply and automatically measuring the unbalance amount of a water turbine runner.

[0014]

The above object can be achieved as follows.

(1) A spherical hydrostatic bearing composed of a spherical surface seat and a spherically shaped mounting body mounted on the spherical surface seat is used, and the surface is levitated with respect to the spherical surface seat. In an unbalance measuring device of a water turbine runner for measuring an unbalance amount, a spherical seat mounting flange is fixedly mounted on a lower surface of a spherical seat, and a connecting rod A is erected at both ends of the spherical seat mounting flange, and an upper end of the connecting rod A is installed. Part is fixed to the hanging metal fittings, and the hanging metal fittings are connected to the hooks hung on the crane.On the other hand, the mounting body mounting flange is fixed to the top flat surface of the mounting body, and both ends of the mounting body mounting flange are Lower the connecting rod B through the hole provided in the spherical seat mounting flange, and fix the lower end of the connecting rod B to the water turbine runner mounting flange fixed to the back surface of the water turbine runner.

(2) In (1), a pipe for supplying pressure oil to the oil groove engraved in the spherical seat and a pressure oil pump are provided, and an inclinometer is installed on the water turbine runner mounting flange.

[0017]

According to the unbalance measuring device for a water turbine runner of the present invention, when the water turbine runner is mounted on the unbalance measuring device and pressure oil is supplied to the spherical hydrostatic bearing, the mounting body mounting flange, connecting rod B, and The mounting body connected to the water turbine runner through the water turbine runner mounting flange floats with respect to the spherical seat connected to the crane through the spherical seat mounting flange, the connecting rod A and the hanging metal fitting.

Therefore, the turbine runner tilts in a stable direction and stands still due to the unbalance of the turbine runner itself, and the amount of unbalance is measured by the inclinometer installed on the turbine runner mounting flange. be able to.

Further, since the unbalance measuring device is provided on the main shaft side of the main shaft mounting surface of the water turbine runner, it is not necessary to provide a gap in the central portion of the water turbine runner, and only the operation of suspending and lifting the water turbine runner can be performed. Since the turbine runner can be attached to and removed from the unbalance measuring device, the unbalance of the turbine runner can be easily measured.

Further, the inclination of the water turbine runner due to the imbalance of the water turbine runner can be corrected by adding a counter weight, and the counter weight amount added for the correction is the inclination angle of the water turbine runner and the water turbine runner. It is determined by the weight / center of gravity position and the position where the counterweight is added. In this case, the tilt angle of the turbine runner is
Since it is measured by the inclinometer installed in the unbalance measuring device, the counter weight amount added for correction can be easily calculated and the calculation can be automated.

[0021]

EXAMPLE An example of the present invention will be described with reference to FIGS.

FIG. 1 is a vertical sectional view of an unbalance measuring device according to one embodiment, FIG. 2 is an explanatory view of an unbalance amount calculation according to one embodiment, and FIG. 3 is a vertical sectional view of a spherical hydrostatic bearing according to one embodiment. FIG. 4 is an explanatory view of hoisting a water turbine runner according to one embodiment, FIG. 5 is an explanatory view regarding inclination of a spherical hydrostatic bearing according to one embodiment, and FIGS. 7 to 9 are explanatory views regarding calculation of a counter weight according to one embodiment.
Reference numeral 0 is a flow chart for calculating an unbalance amount according to one embodiment, 1 is a turbine runner, 2 is a main shaft mounting surface, 3 is a turbine runner mounting flange, 4 is a bolt A, 5 is a spherical hydrostatic bearing,
6 is a mounting body, 7 is a spherical seat, 8 is an oil groove, 9 is a mounting body mounting flange, 10 is a distant piece A, 11 is a spherical seat mounting flange, 12 is hole A, 13 is hole B, 14 is Holes C and 15 are bolts B, 16 is a hanging fitting, 17 is a pin, 1
8 is a crane, 19 is a hook, 20 is a distant piece B, 21 is a pipe A, 22 is a pipe B, 23 is a pressure oil pump, 24 is an electronic inclinometer A, 25 is an electronic inclinometer B, 2
6 is a code A, 27 is an amplifier, 28 is a code B, 29 is an AD converter, 30 is a calculator, 31 is a central axis, 32 is a rotation center, 33 is a tilt angle of a water turbine runner, 34 is a center of gravity position, 3
5 is a counter weight addition position, 36 is a central axis direction distance from the rotation center to the center of gravity position, 37 is a center axis direction distance from the rotation center to the counter weight addition position, 38
Is the distance from the central axis to the additional position of the counterweight in the direction perpendicular to the central axis, 39 is the amount of deviation, 40 is the tilt angle of the turbine runner about the X axis, 41 is the tilt angle of the turbine runner about the Y axis, and 42 is the angle. Shows the balance direction.

In FIG. 1, a water turbine runner 1 to be measured has a spindle mounting surface 2 on its rear surface, and a turbine turbine runner mounting flange 3 is fixed to the spindle mounting surface 2 so that the turbine turbine runner mounting flange 3 has the same concentric circumference. The bolt A4 arranged above is erected on the water turbine runner mounting flange 3, and the upper portion of the bolt A4 is fixed to the mounting body mounting flange 9 fixed to the mounting body 6 of the spherical hydrostatic bearing 5.

Further, the distance piece A1 is provided between the water turbine runner mounting flange 3 and the mounting body mounting flange 9.
By setting 0, a constant interval is maintained.

On the other hand, the spherical seat mounting flange 11 fixed to the spherical seat 7 on which the mounting body 6 is mounted has the bolts 15B arranged concentrically and on the same circumference as the spherical seat mounting flange 11.
And the upper part of the bolt 15B is fixed to the hanging metal fitting 16.

The hanging fitting 16 is a hook 19 of the crane 18.
Is connected with a pin 17, and the spherical seat mounting flange 11
A constant gap is maintained between the hanger 16 and the hanging fitting 16 by a distant piece B20. Further, the spherical seat mounting flange 11 is provided with a hole A12 through which the bolt 4 penetrates.

Further, in the central portion of the spherical seat mounting flange 11, a hole B13 through which a pipe A21 for supplying oil to the oil groove 8 of the spherical seat 7 and a hole C through which a pipe B22 for collecting used oil is passed are provided.
14 are provided, and the pipe A21 and the pipe B22 are connected to the pressure oil pump 23.

An electronic inclinometer A24 is mounted on the upper surface of the water turbine runner mounting flange 3, but this is one of the two mounted.

That is, in FIG. 2, an electronic inclinometer A24 is installed on the water turbine runner mounting flange 3 in two directions at right angles.
And an electronic inclinometer B25 are installed, and these are code A2
6, the amplifier 27 is connected, and the amplifier 27 is connected to the A / D converter 29 and the computer 30 through the code B28.

Next, the operation of this embodiment configured as described above will be described with reference to FIGS.

In FIG. 3, the pressure oil pump 23 is driven,
Pressure oil is supplied to the spherical hydrostatic bearing 5 through the pipe A21, and an oil film is formed between the mounting body 6 and the spherical seat 7. In this state, as shown in FIG. 4, the crane 18 is driven to pull up the hook 19, and the water turbine runner 1 and the unbalance measuring device, which are indirectly connected to the hook 19, are lifted from the floor.

In FIG. 5, the friction coefficient between the mounting body 6 and the spherical seat 7 is close to zero due to the oil film, so that the water turbine runner 1
Due to its own imbalance, the central axis of the spherical surface of the mounting body 6 is the center of rotation 32, and the central axis 31 is inclined at a constant inclination angle 33 of the water turbine runner with respect to the vertical axis.

In FIG. 6, the center of gravity position 34 of the water turbine runner 1 is on the center axis 31 of the center axis direction distance 36 from the center of rotation 32 to the center of gravity position of the rotation, and gravity W at the center of gravity position 34. In the case where is acting, the position of the central axis direction distance 37 from the center of rotation to the additional position of the counterweight and the distance 38 from the central axis to the additional position of the counterweight in the direction perpendicular to the central axis, that is, the outer periphery of the water turbine runner 1. The relationship between the counter weight w and the tilt angle 33 of the water turbine runner when the counter weight w is added to the counter weight addition position 35, which is one position of the section, is shown. The tilt angle 33 of the water turbine runner is determined by an electronic inclinometer A24 installed on the upper surface of the water turbine runner mounting flange 3.
And an electronic inclinometer B25 (see FIG. 2) are used for the measurement. The signals output from these electronic inclinometers are amplified by the amplifier 27 (see FIG. 2), converted into digital signals by the A / D converter 29, and the unbalance amount is calculated in the computer 30.

Next, the concept of calculating the counterweight amount from the inclination angle 33 of the water turbine runner will be described with reference to FIGS.

FIG. 7 shows the center of gravity 34 of the water turbine runner 1.
Is usually not on the central axis 31 and is
In FIG. 8, a counterweight w is added to the counterweight addition position 35, which is one point on the outer circumference of the water turbine runner 1, as a moment equivalent to the moment caused by the state shown in FIG. 7. The desired state is shown.

That is, the unbalance amount of the water turbine runner 1 can be expressed by determining the equivalent position 35 of the counter weight and suspending the counter weight w at that position. Is asked for. That is,

[0037]

[Formula 1] w = W · l · sin θ / (R · cos θ−L · sin θ) (1) where w: counter weight (kgf) W: weight of turbine runner (kgf) l: rotation Distance from the center to the center of gravity in the direction of the central axis (mm) θ: Angle of inclination of the turbine runner (radian or degree) R: Distance from the central axis to the additional position of the counterweight in the direction perpendicular to the central axis (mm) L: Counter from the rotation center The distance (mm) in the central axis direction to the position where the weight is added. Although the formula (1) is accurately configured to include the bias amount 39, even if the bias amount 39 is excluded, the counter is highly accurate. The weight w is obtained.

FIG. 9 is an explanatory diagram for obtaining the tilt angle 33 of the water turbine runner. The tilt angle 33 of the water turbine runner is
The tilt angle 40 of the water turbine runner about the X axis and the tilt angle 41 of the water turbine runner about the Y axis can be used to obtain the value as follows.

[0039]

[Equation 2]

Where θx: inclination angle of the water turbine runner about the X axis (radian or degree) θy: inclination angle of the water turbine runner about the Y axis (radian or degree) θ: same as the above-mentioned symbol The direction (angle from the x-axis) 42 is obtained as follows.

[0041]

## EQU3 ## α = arctan (θx / θy) ………………………… (3) where α is the unbalance direction (angle from the x-axis) θx, θy: the above symbols That is, by setting the counterweight addition position 35 to the unbalance correction position (the position where the unbalance weight is corrected so that the unbalance weight is within the allowable value when the calculated unbalance weight exceeds the allowable value) The required correction machining instruction value can be easily calculated.

Further, FIG. 10 shows a processing flow for calculating the unbalance amount in the computer 30. In this case, the unbalance amount is calculated using the average value of the tilt angle data of the water turbine runner for 10 seconds, and a constant unbalance amount can be obtained without being affected by the vibration of the crane.

[0043]

According to the present invention, in an unbalance measuring device for a water turbine runner, the measuring device can be installed on the spindle side of the spindle mounting surface of the turbine runner, so that the prop of the measuring device is passed through the center of the turbine runner. Therefore, it is not necessary to provide a gap for this purpose, and it is possible to perform unbalance measurement work on the turbine runner including the center.

Further, since the rotational driving device of the water turbine runner is not required, the unbalance amount can be calculated automatically, and the equipment can be simplified and the work can be simplified, and the measurement work can be shortened.

Further, since the hanging fitting is attached to the unbalance measuring device, the unbalance measuring work of the water turbine runner can be performed by only lifting the water turbine runner once.
It eliminates the need to change the wire rope at high places, improving work safety.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an unbalance measuring device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an unbalance amount calculation according to an embodiment of the present invention.

FIG. 3 is a vertical sectional view of a spherical hydrostatic bearing according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram of hoisting a water turbine runner according to an embodiment of the present invention.

FIG. 5 is an explanatory diagram related to the inclination of the spherical hydrostatic bearing according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram related to the inclination of the water turbine runner according to the embodiment of the present invention.

FIG. 7 is an explanatory diagram related to calculation of a counter weight amount according to an embodiment of the present invention.

FIG. 8 is an explanatory diagram related to calculation of a counter weight amount according to an embodiment of the present invention.

FIG. 9 is an explanatory diagram related to calculation of a counter weight amount according to an embodiment of the present invention.

FIG. 10 is a flow chart of an unbalance amount calculation process according to an embodiment of the present invention.

[Explanation of symbols]

1 ... Turbine runner, 3 ... Turbine runner mounting flange, 4 ...
Bolts A, 5 ... Spherical hydrostatic bearing, 6 ... Mounting body, 7 ... Spherical seat, 8 ... Oil groove, 9 ... Mounting body mounting flange, 11 ... Spherical seat mounting flange, 12 ... Hole A, 15 ... Bolt B , 16
... hanging metal fittings, 18 ... crane, 19 ... hook, 21 ... piping A, 22 ... piping B, 23 ... hydraulic pump, 24 ... electronic inclinometer A, 25 ... electronic inclinometer B.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ikuo Kawabata 3-1-1, Saiwaicho, Hitachi-shi, Ibaraki Hitachi Ltd. Hitachi factory (72) Inventor Hiroshi Yamaguchi 3-chome, Saiwaicho, Hitachi-shi, Ibaraki No. 1 Hitachi Ltd. Hitachi factory

Claims (2)

[Claims] 1. A spherical hydrostatic bearing composed of a spherical surface seat and a spherically shaped mounting body mounted on the spherical surface seat is used. In an unbalance measuring device of a water turbine runner for measuring an unbalance amount, a spherical seat mounting flange is fixedly provided on a lower surface of the spherical seat, and a connecting rod A is provided at both ends of the spherical seat mounting flange.
Is erected, and the upper end of the connecting rod A is fixed to the hanging metal fitting,
The hanging metal fittings are connected to hooks hung on a crane, while the mounting body mounting flange is fixed to the flat surface of the upper surface of the mounting body, and the spherical seat mounting flange is attached from both ends of the mounting body mounting flange. An unbalance measuring device for a water turbine runner, characterized in that the connecting rod B is lowered through a hole provided in the water turbine runner, and the lower end portion of the connecting rod B is fixed to a water turbine runner mounting flange fixed to the back surface of the water turbine runner. 2. The water turbine runner according to claim 1, further comprising a pipe for supplying pressure oil to an oil groove formed in the spherical seat and a pressure oil pump, and an inclinometer installed on the water turbine runner mounting flange. Unbalance measuring device.