KR20190054737A - Bucket vibration damping device and turbine machine comprising same - Google Patents

Abstract

The present invention relates to a bucket vibration damping device, and more specifically, to a bucket vibration damping device which damps vibration generated at a bucket by applying a magnetic force to the bucket, thereby changing a unique frequency of the bucket. The bucket vibration damping device according to an embodiment of the present invention comprises: a tip timing probe measuring vibration of the bucket; an oscillator generating a magnetic force so as to apply the magnetic force to the bucket; and a control unit controlling the magnetic force applied by the oscillator to the bucket based on the vibration of the bucket measured by the tip timing probe.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bucket vibration damping device and a turbomachine including the bucket vibration damping device and turbine machine,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bucket vibration damping device and a turbo machine including the bucket vibration damping device. More particularly, the present invention relates to a bucket vibration damping device for damping vibration generated in a bucket by applying a magnetic force to the bucket, Machine.

In general, turbine buckets are a key component in converting the thermodynamic energy of steam or flue gas into mechanical energy to produce power. If a turbine bucket is damaged, it can cause serious accidents throughout the turbine and other power generation facilities. A typical cause of damage to a turbine bucket is vibration. If the external force generated by the turbine bucket is equal to the natural frequency of the turbine bucket, resonance occurs in the turbine bucket, which can damage the turbine bucket. Therefore, in order to prevent damage to the turbine bucket, a device for monitoring vibration occurring in the bucket during operation of the turbine is indispensable. Furthermore, a device is needed to prevent damage to the turbine bucket when resonance occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bucket vibration damping device for changing the natural frequency of a bucket by applying a magnetic force to the bucket when resonance occurs in the bucket, and a turbo machine including the bucket vibration damping device.

It is another object of the present invention to provide a bucket vibration damping device for damping vibrations generated in a bucket by changing the natural frequency of the bucket so that the frequency of vibration externally applied does not coincide with the natural frequency of the bucket, do.

Other features and advantages of the invention will be set forth in the description which follows, or may be obvious to those skilled in the art from the description and the claims.

In order to achieve the above object, a bucket vibration damping device according to an embodiment of the present invention includes a tip timing probe for measuring vibrations of a bucket, a vibrator for generating magnetic force to apply a magnetic force to the bucket, And a control unit for controlling the magnetic force applied by the exciter to the bucket based on the vibration of the bucket.

Here, the tip timing probe measures the frequency and oscillation period of the bucket.

Further, the control unit controls the intensity of the magnetic force so that the natural frequency of the bucket changes when resonance occurs in the bucket.

Further, the shape of the bucket is temporarily changed by the magnetic force.

Further, the shape of the bucket is changed, and the natural frequency of the bucket is changed, so that the vibration generated in the bucket is attenuated.

Further, the bucket is formed of a metal that reacts by magnetic force.

Further, the tip timing probe is installed in a casing arranged to surround the tip portion of the bucket.

The exciter is disposed in a casing arranged to surround a tip portion of the bucket, and is disposed in a direction in which the side surface of the bucket is viewed to apply a magnetic force to a side surface of the bucket.

In addition, the exciter is coupled to the rotor to apply a magnetic force to the side surface of the rotating bucket, and when the bucket and the exciter are adjacent to each other, attraction is generated between the bucket and the exciter.

Further, the apparatus further includes a connecting portion connecting adjacent buckets, and the connecting portion is formed of metal reacting by a magnetic force.

According to an aspect of the present invention, there is provided a turbomachine including a rotor rotating at a high speed using steam to produce electric power, a bucket coupled to an outer circumferential surface of the rotor, a casing disposed to surround a tip portion of the bucket, A tip timing probe for measuring the vibration of the bucket, a vibrator for generating magnetic force to apply a magnetic force to the bucket, and a controller for controlling the magnetic force applied to the bucket by the vibrator based on the vibration of the bucket measured by the tip timing probe .

The controller may further include an interface unit for transmitting the vibration of the bucket measured by the tip timing probe to the control unit and transmitting the vibration to a machine having a signal for controlling the magnetic force received by the control unit.

Further, the control unit controls the intensity of the magnetic force so that the natural frequency of the bucket changes when resonance occurs in the bucket.

Further, the shape of the bucket is temporarily changed by the magnetic force.

The tip timing probe and the exciter are disposed on the casing. The tip timing probe is disposed so as to face the tip portion in a direction perpendicular to the rotation axis of the rotor. The exciter is disposed in a direction in which the side of the bucket is viewed, .

In addition, the exciter is coupled to the rotor to apply a magnetic force to the side surface of the rotating bucket, and when the bucket and the exciter are adjacent to each other, attraction is generated between the bucket and the exciter.

The bucket vibration damping device and the turbo machine including the bucket vibration damping device according to the embodiment of the present invention can measure the vibration frequency and vibration period of the vibration generated in the bucket through the tip timing probe.

In addition, it is possible to change the natural frequency of the bucket by changing the shape of the bucket.

In addition, it is possible to prevent damage to the bucket by damping vibration generated in the bucket by changing the natural frequency of the bucket.

Also, it is possible to prevent the turbine from being disassembled to replace or repair the bucket due to the damage of the bucket, thereby saving the cost.

In addition, other features and advantages of the present invention may be newly understood through embodiments of the present invention.

1 is a view showing a bucket vibration damping device according to an embodiment of the present invention.
Fig. 2 is an enlarged view of a portion of Fig.
3 is a view showing a shape change of a bucket according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as " comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

If any part is referred to as being " on " another part, it may be directly on the other part or may be accompanied by another part therebetween. In contrast, when a section is referred to as being " directly above " another section, no other section is involved.

The terms first, second and third, etc. are used to describe various portions, components, regions, layers and / or sections, but are not limited thereto. These terms are only used to distinguish any moiety, element, region, layer or section from another moiety, moiety, region, layer or section. Thus, a first portion, component, region, layer or section described below may be referred to as a second portion, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified and that the presence or absence of other features, regions, integers, steps, operations, elements, and / It does not exclude addition.

Terms indicating relative space such as " below ", " above ", and the like may be used to more easily describe the relationship to other portions of a portion shown in the figures. These terms are intended to include other meanings or acts of the apparatus in use, as well as intended meanings in the drawings. For example, when inverting a device in the figures, certain portions that are described as being " below " other portions are described as being " above " other portions. Thus, an exemplary term " below " includes both up and down directions. The device can be rotated by 90 degrees or rotated at different angles, and terms indicating relative space are interpreted accordingly.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

1 is a view showing a bucket vibration damping device according to an embodiment of the present invention.

Referring to FIG. 1, a bucket vibration damping apparatus 200 according to an embodiment of the present invention includes a bucket 210, a tip timing probe 220, a vibrator 230, an interface unit 240, a controller 250, And a connection portion 260. The bucket vibration damping device 200 may be applied to a steam turbine and a gas turbine.

The bucket 210 is coupled to the outer circumferential surface of the rotor 120 to convert the flow of the steam into rotational motion. A plurality of buckets 210 may be provided in a direction perpendicular to the rotational axis of the rotor 120. Here, the rotor 120 is a device that produces high-speed rotating electric power using high-temperature high-pressure steam obtained by combustion of raw materials, and can extract energy from the steam flow. The bucket 210 vibrates and rotates together with the rotor 120 during the operation of the rotor 120. The bucket 210 receives the energy due to the air flow during the vibration and flutter phenomenon in which the bucket 210 is severely vibrated may occur . That is, each bucket 210 has a specific frequency, and vibrations corresponding to natural frequencies of the bucket 210 are applied to the bucket 210 by the air flow, so that the bucket 210 may be severely vibrated.

The tip timing probe 220 can measure the vibration of the bucket. Specifically, the tip timing probe 220 is installed in a non-contact manner with the bucket 210, and may be attached to the diaphragm or the casing 20 mainly. The tip timing probe 220 can measure the time that the bucket 210 passes through the tip timing probe 220 and thereby measure the frequency and oscillation period occurring in the bucket 210.

The exciter 230 generates a magnetic force to apply a magnetic force to the bucket 210. The exciter 230 generates a magnetic force using an electromagnet, and the shape of the bucket 210 can be temporarily changed by the magnetic force. Here, when the energy received by the air flow during the rotation of the bucket 210 matches the natural frequency of the bucket 210, the bucket 210 is subjected to severe vibration. At this time, if the shape of the bucket 210 is changed by the magnetic force applied by the vibrator 111, the natural frequency of the bucket 210 is changed, and thus the energy received by the airflow is changed to the natural frequency of the bucket 210 The vibration generated in the bucket 210 can be attenuated. Therefore, by changing the shape of the bucket 210 so that the energy received by the air flow does not match the natural frequency of the bucket 210, the vibration generated in the bucket 210 can be attenuated. Here, the bucket 210 may be formed of metal so that the shape of the bucket 210 is changed by a magnetic force applied by the vibrator 230. At this time, the bucket 210 may be a metal such as a titanium alloy reacting with a magnetic force.

The interface unit 240 may transmit information about the vibration of the bucket 210 measured by the tip taming sensor 220 to the controller 250. The interface unit 240 may be a component of the tip timing sensor 220 and may be installed outside the bucket 110 in a configuration separate from the tip timing sensor 220. The interface unit 240 may transmit the signal to the controller 230 having a signal for controlling the magnetic force of the vibrator 230 received by the controller 250.

The control unit 250 controls the magnetic force applied by the exciter 230 to the bucket 210 based on the vibration of the bucket 210 measured by the tip timing probe 220. The control unit 250 may control the exciter 230 to generate a magnetic force when it is determined that the vibration of the bucket 210 measured by the tip timing probe 220 is greater than a predetermined reference. At this time, the control unit 250 can control the magnetic force so that the natural frequency of the bucket 210 and the energy received by the air flow are different. That is, the control unit 250 controls the intensity of the magnetic force applied by the exciter 230 to the bucket 210 to change the shape of the bucket 210.

The communication unit 251 may include a communication unit 251, a determination unit 252 and a calculation unit 253. The communication unit 251 may include a communication unit 251, a determination unit 252, Can be transmitted. The communication unit 251 can receive the signal for controlling the magnetic force applied to the bucket 210 by the vibrator 230 to the interface unit 240. [

The determination unit 252 can determine the vibration generated in the bucket 210 through the information about the vibration of the bucket 210 received by the communication unit 251. [ That is, the determination unit 252 can determine the vibration frequency and the vibration period of the vibration generated in the bucket 210.

The calculator 253 can calculate the intensity of the magnetic force to be applied to the bucket 210 through the frequency and the oscillation period determined by the determiner 252 to control the magnetic force generated in the exciter 230. [ For example, the calculator 253 may cause the exciter 230 to generate magnetic force when the vibrations generated in the bucket 210 are greater than a certain standard. In other words, when the magnitude of the vibration generated in the bucket 210 is small, the calculator 253 controls the vibrator 230 to generate a magnetic force of weak intensity, and the magnitude of the vibration generated in the bucket 210 is It is possible to control so that the large exciter 230 generates a magnetic force of a strong intensity. The intensity of the magnetic force calculated by the calculation unit 253 is transmitted to the interface unit 240 through the communication unit 251 and the interface unit 240 receives the intensity of the magnetic force calculated by the calculation unit 253 230).

The connecting portion 260 can connect adjacent buckets 210. The connecting portion 260 may be formed of a metal reacting by a magnetic force, and the shape of the connecting portion 260 may be temporarily changed by a magnetic force applied by the exciter 230. At this time, since the connecting portion 260 is connected to the plurality of buckets 210, the shape of the connecting portion 260 may be changed and the shape of the bucket 210 may be changed. By changing the shape of the bucket 210, the natural frequency of the bucket 210 is changed, so that the vibration generated in the bucket 210 can be attenuated. Here, the connection portion 260 may be included in the bucket 210 or may be a separate structure.

The bucket vibration damping device 200 according to the embodiment of the present invention can change the natural frequency of the bucket 210 by temporarily changing the shape of the bucket 210 by the vibrator 230. [ A change in the path of the steam passing between the plurality of buckets 210 occurs in accordance with the change of the natural frequency of the bucket 210 and thus the vibration generated in the buckets 210 can be canceled. The frequency and the oscillation period of the bucket 210 measured by the tip timing probe 220 are calculated by the controller 240 and influence the magnetic force generated by the oscillator 230. In addition, the control unit 240 can control the magnetic force generated by the exciter 230 in consideration of changes in the steam path and natural frequency of the bucket 210 due to the magnetic force. The vibration of the bucket 210 can be measured by the bucket vibration damping device 200 and the vibrations of the bucket 210 can be attenuated when the bucket 210 is severely vibrated. It is possible to prevent the occurrence of damage to the substrate. Therefore, it is possible to prevent the turbine from being disassembled due to the damage of the bucket 210 and to replace or repair the bucket 210, thereby saving the cost.

Fig. 2 is an enlarged view of a portion of Fig.

Referring to FIGS. 1 and 2, the bucket 210 is connected to the rotor 120 so that the rotor 120 can rotate as the rotor 120 rotates. When the energy applied to the bucket 210 by the air flow is equal to the natural frequency of the bucket 210, the bucket 210 is subjected to a severe vibration Can occur. In this case, the bucket 210 may be damaged or even affect the turbine. Accordingly, the bucket vibration damping device 200 can attenuate the vibration of the bucket 210 by making the energy applied to the bucket 210 by the air flow not coincide with the natural frequency of the bucket 210.

Here, the tip timing probe 220 and the exciter 230 may be installed in the casing 20. [ The casing 20 is formed so as to surround the tip 212 of the bucket and may be formed to correspond to the rotor 120 so as to face the tip 212 of the bucket in a direction perpendicular to the rotational axis of the rotor 120 As shown in FIG. That is, it may be formed so as to enclose the tip 212 of the bucket both on the upper side and on the side. The tip timing probe 220 may be installed in the casing 20 in a direction corresponding to the rotor 120 and installed in the direction toward the bucket 210 to measure the frequency and vibration period of the bucket 210 . The exciter 230 may be installed in the direction of the side of the bucket 210 and may apply a magnetic force toward the side of the bucket 210. Here, the exciter 230 is coupled to the rotor 120 to apply a magnetic force to the side surface of the rotating bucket 210. When the exciter 230 and the bucket 210 are adjacent to each other, So that a force can be generated between the base and the base.

The connection unit 250 connects the adjacent buckets 210 and may be connected to the tips 212 of adjacent buckets. Here, the connection unit 250 may be included in the bucket 210 or may be a separate configuration.

3 is a view showing a shape change of a bucket according to an embodiment of the present invention.

Referring to FIGS. 1 and 3, the tip timing probe 220 can measure a frequency and a vibration period of the bucket 210. The control unit 240 can control the intensity of the magnetic force applied to the bucket 210 by the exciter 230 based on the frequency and vibration period measured by the tip timing probe 220. [ The control unit 240 controls the vibrator 230 when it is determined that the frequency of the natural frequency of the bucket 210 is equal to the frequency of the energy applied by the airflow and the vibrator 230 controls the control unit 240 So that the magnetic force can be applied to the bucket 210 with a certain strength. If the vibrator 230 applies a magnetic force to the vibrator 230 and the bucket 210 are adjacent to each other, a force is generated between the bucket 210 and the vibrator 230, . ≪ / RTI >

That is, the bucket 210 rotates to the first shape 210a, and based on the determination of the controller 240, the exciter 230 can apply a magnetic force toward the bucket 210. At this time, when the bucket 210 is positioned within the magnetic force range of the exciter 230, the bucket 210 may be influenced by the magnetic force, and the bucket 210 may be formed of metal to be influenced by the magnetic force. The bucket 210 may be pulled by the magnetic force in the direction of the exciter 230 to be changed into the second shape 210b and the natural frequency of the bucket 210 may be changed. When the bucket 210 continues to rotate and thus exceeds the range of the magnetic force of the exciter 230, the bucket 210 can be changed again to the first shape 210a. Here, the magnetic force is not limited to pulling the bucket 210, but may be a pushing out of the bucket 210.

According to the embodiment of the present invention, it is possible to implement a bucket vibration damping device that applies magnetic force to the bucket to change the natural frequency of the bucket to damp vibrations occurring in the bucket.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. Only. It is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. .

210: Bucket
212: Tip of the bucket
220: Tip Timing Probe
230: Exciter
240:
250:
260: Connection
20: casing

Claims (16)

A tip timing probe for measuring vibration of the bucket;
A vibrator for generating magnetic force to apply the magnetic force to the bucket; And
And a control unit for controlling a magnetic force applied to the bucket by the vibrator based on vibrations of the bucket measured by the tip timing probe. The tip timing probe according to claim 1,
And measures the frequency and vibration period of the bucket. The apparatus of claim 1,
And controls the intensity of the magnetic force so that a natural frequency of the bucket is changed when resonance occurs in the bucket. The method according to claim 1,
Wherein the shape of the bucket is temporarily changed by the magnetic force. 5. The method of claim 4,
Wherein the bucket is deformed to change a natural frequency of the bucket so that vibration generated in the bucket is attenuated. The method according to claim 1,
Wherein the bucket is formed of a metal that reacts by the magnetic force. The tip timing probe according to claim 1,
And a casing disposed to surround a tip portion of the bucket. The exciter as claimed in claim 1,
The bucket vibration damping device as set forth in claim 1, wherein the bucket is provided with a casing which is disposed so as to surround a tip portion of the bucket. 9. The method of claim 8,
Wherein the exciter is coupled to a rotor and applies the magnetic force to a side surface of the bucket rotating to apply attraction force between the bucket and the vibrator when the bucket and the vibrator are adjacent to each other. The method according to claim 1,
Further comprising: a connecting portion connecting the adjacent buckets,
Wherein the connecting portion is formed of a metal that reacts by the magnetic force. A rotor rotating at a high speed using steam to produce electric power;
A bucket coupled to an outer circumferential surface of the rotor;
A casing disposed to surround a tip portion of the bucket;
A tip timing probe for measuring vibration of the bucket;
A vibrator for generating magnetic force to apply the magnetic force to the bucket; And
And a control unit for controlling a magnetic force applied to the bucket by the vibrator based on vibrations of the bucket measured by the tip timing probe. 12. The method of claim 11,
Further comprising an interface unit for transmitting the vibration of the bucket measured by the tip timing probe to the control unit and transmitting a signal for controlling the magnetic force received by the control unit to the vibrator. 12. The apparatus according to claim 11,
And controlling the intensity of the magnetic force so that a natural frequency of the bucket is changed when resonance occurs in the bucket. 12. The method of claim 11,
Wherein the shape of the bucket is temporarily changed by the magnetic force. 15. The method of claim 14,
The tip timing probe and the exciter being installed in the casing,
Wherein the tip timing probe is disposed so as to face the tip portion in a direction perpendicular to the rotation axis of the rotor,
Wherein the exciter is disposed in a direction in which the side surface of the bucket is viewed and applies the magnetic force to a side surface of the bucket. 12. The method of claim 11,
Wherein the exciter is coupled to a rotor and applies the magnetic force to a side surface of the rotating bucket so that attraction is generated between the bucket and the exciter when the bucket and the exciter are adjacent to each other.

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