JP2019120658A - Rotational machine and method for determining abrasion state - Google Patents

Abstract

To determine whether a predetermined abrasive state has generated in a bearing part without fail, reduce the resting period, and reduce the frequency of an inspection work.SOLUTION: A rotational machine 100 includes: a rotor 10: a housing 20 containing the rotor 10; a bearing unit 30 attached to the housing 20, the bearing unit supporting the rotor 10; a measurement unit 40 for measuring the distance from each reference position in the outer periphery of the housing 20 to the outer periphery surface 10a of the rotor 10; and a determination unit for determining whether a predetermined abrasive state has generated in the bearing part 30 according to the results of the measurement made by the measurement unit 40 in the plurality of reference positions, the results of measurement made in the plurality of reference positions including a first distance L1, measured in a first position P1 in the upper end immediately above the axis of rotation of the rotor 10, and a second distance L2, measured in a second position P2 different from the upper end.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rotary machine and a wear state determination method.

  Conventionally, for example, a rotary machine which mounts and rotates blades has a large diameter rotor (rotary shaft) and a large bearing portion for supporting the rotor. In order to confirm the wear state of the bearing portion, there is a case where the bearing pad itself is measured by opening the bearing stand and the bearing after stopping the rotary machine. To measure this bearing pad itself, in addition to the respective opening operations, reverse assembly operations and realignment operations are required, and it takes many steps and many hours. For this reason, for example, Patent Document 1 is known as a method of measuring the wear state of the bearing without opening the bearing stand and the bearing. Patent Document 1 discloses that a wear amount of a stern tube bearing is measured by inserting a gauge rod into a mounting hole provided in a casing of a propulsion shaft of a ship.

Patent No. 3806500 gazette

  However, in the method disclosed in Patent Document 1, the wear state of the bearing portion is measured only at a single position on the outer peripheral surface of the rotor. Therefore, when a measurement error occurs for some reason or when a factor other than wear of the bearing portion affects the measurement result, it is determined that the bearing portion is in a predetermined wear state. In this case, the rotating machine is stopped and the bearing is inspected even though the bearing is not worn down to a predetermined wear state, a large amount of inspection work occurs, and the stopping period of the rotating machine is long. There is a problem that it takes time.

  The present invention has been made in view of such circumstances, and reliably determines whether or not a predetermined wear state occurs in the bearing portion to reduce the frequency of inspection work and shorten the stop period. It is an object of the present invention to provide a rotary machine and a wear state determination method that can be performed.

In order to solve the above-mentioned subject, a rotary machine of the present invention adopts the following means.
A rotary machine according to one aspect of the present invention includes a rotary shaft, a housing for housing the rotary shaft therein, a bearing portion mounted on the housing and supporting the rotary shaft, and an outer periphery of the housing. Based on the measurement results of measuring the distance to the outer peripheral surface of the rotary shaft with respect to the plurality of reference positions provided, and the wear state of the bearing based on the measurement results at the plurality of reference positions of the measurement unit And a determination unit that determines whether or not a measurement has occurred, and the measurement results of the plurality of reference positions of the measurement unit are at least any one of a vertical upper end or a vertical lower end from the rotation axis of the rotary shaft. A first distance measured at a first position, and a second distance measured at a second position different from the vertical upper end and the vertical lower end.

  According to the rotating machine according to the aspect of the present invention, the distance from the plurality of reference positions provided on the outer periphery of the housing to the outer peripheral surface of the rotating shaft is either the vertical upper end or the vertical lower end from the rotational axis of the rotating shaft Based on the first distance measured at one first position and the second distance measured at a second position different from the first position, the determination unit determines whether or not a predetermined wear state has occurred in the bearing unit Do. If a predetermined wear state is determined based on only the first distance measured at the first position, a measurement error may occur due to some factor or a factor other than wear of the bearing may affect the measurement result. There is a possibility that it may be misjudged as being in a predetermined wear state. According to the rotary machine according to one aspect of the present invention, the predetermined wear state is determined in consideration of the second distance measured at the second position, so whether or not the predetermined wear state occurs in the bearing portion Can be determined with certainty. Therefore, the frequency of inspection work can be reduced and the stop period of the rotary machine can be shortened.

In the rotary machine according to one aspect of the present invention, the measurement results of the plurality of reference positions of the measurement unit are a first initial value which is the first distance at the time of starting management of the measurement results, and the second The determination unit determines a first gap between the bearing and the rotating shaft at the first position by subtracting the first initial value from the first distance. A gap is calculated, and the second initial value is subtracted from the second distance to calculate a second gap between the bearing and the rotating shaft at the second position, and Whether or not the predetermined wear state has occurred in the bearing portion may be determined based on the second gap distance.
The initial value is subtracted from the distance measured by the measuring unit to calculate the gap distance between the bearing and the rotating shaft at a plurality of locations including the first position and the second position, and based on these, the predetermined wear state is determined Since the determination unit makes the determination, it can be reliably determined based on the gap intervals at the plurality of positions whether or not a predetermined wear state has occurred in the bearing unit with the passage of time.

In the rotating machine according to one aspect of the present invention, the measuring unit causes the tip end of the rod-like member penetrating the housing to contact the outer peripheral surface of the rotating shaft while the rotation of the rotating shaft is stopped. Thereby, the distance from the reference position of the housing to the outer peripheral surface of the rotary shaft may be measured.
By doing this, the distance from the housing to the outer peripheral surface of the rotary shaft can be measured by a relatively simple structure in which the tip of the rod-like member is brought into contact with the outer peripheral surface of the rotary shaft. In addition, since the measurement is performed in a state where the rotation of the rotary shaft is stopped, there occurs a problem that the rotary shaft is rotated and the rotary shaft is damaged while the tip of the rod-like member is in contact with the outer peripheral surface There is nothing to do.

In the rotary machine according to one aspect of the present invention, the measuring unit is a non-contact distance measuring unit attached to a tip of a rod-like member penetrating the housing while the rotary shaft is rotating. The distance from the distance measuring unit to the outer peripheral surface of the rotary shaft may be measured.
Since the distance from the distance measuring unit to the outer peripheral surface of the rotating shaft is measured by the non-contact distance measuring unit, there is no need to stop the rotating machine even at the time of measurement by the measuring unit. It can be shortened. In addition, in order to measure the distance to the outer peripheral surface of the rotating shaft under the condition that the rotating shaft is supported by the bearing, measurement during operation reflecting the operating condition of the bearing and the oil level condition at the bearing As a result, reliable measurement can be performed, and it can be determined more reliably whether or not a predetermined wear state has occurred in the bearing portion.

In the rotary machine according to one aspect of the present invention, the determination result for the occurrence of the predetermined wear state determined by the determination unit, the measurement result of the measurement unit when the determination result is obtained, and the determination result A storage unit that stores wear management information that associates operation parameters of the rotating machine at the time of obtaining; and the bearing based on the wear management information stored in the storage unit and a measurement result by the measurement unit. And a prediction unit that predicts a replacement time of the unit.
In this way, it is possible to predict the replacement time of the bearing in consideration of not only the current measurement result measured by the measurement unit but also the wear management information associated with the determination result of the predetermined wear state in the past. Therefore, it is possible to predict an appropriate replacement time according to the past results, and to plan in advance the preparation of replacement parts requiring the time of maintenance work and the delivery date.

  A wear state determination method according to an aspect of the present invention includes a rotation shaft, a housing that houses the rotation shaft, and a bearing that is attached to the housing and supports the rotation shaft. A method of determining a wear state of a machine, comprising: measuring steps of measuring distances from an outer peripheral surface of the rotating shaft to a plurality of reference positions provided on an outer periphery of the housing; and a plurality of the reference positions of the measuring step And a determination step of determining whether or not a predetermined wear state has occurred in the bearing portion based on the measurement result in step b), and the measurement results of the plurality of reference positions in the measurement step are at least A first distance measured at a first position of either the vertical upper end or the vertical lower end of the rotating shaft, and a second distance measured at a second position different from the vertical upper end and the vertical lower end.

  According to the wear state determination method of one aspect of the present invention, the distances from the plurality of reference positions provided on the outer periphery of the housing to the outer peripheral surface of the rotary shaft are Determining whether or not a predetermined wear state has occurred in the bearing based on the first distance measured at one of the first positions and the second distance measured at the second position different from the first position Can be determined. If a predetermined wear state is determined based on only the first distance measured at the first position, a measurement error may occur due to some factor, or a factor other than wear of the bearing may affect the measurement result. Even if it is present, there is a possibility that it may be erroneously determined to be a predetermined wear state. According to the wear state determination method according to the aspect of the present invention, the predetermined wear state is determined in consideration of the second distance measured at the second position. Whether or not it can be determined with certainty. Therefore, the stop period of the rotary machine can be shortened and the frequency of the inspection work can be reduced by this wear state determination method.

  According to the present invention, it is possible to reliably determine whether or not a predetermined wear state occurs in the bearing portion, reduce the frequency of inspection work, and reduce the stop period, and a wear state determination method. Can be provided.

It is sectional drawing in the plane orthogonal to the rotor of the rotary machine of 1st Embodiment. It is II arrow sectional drawing of the rotary machine shown in FIG. It is the elements on larger scale of the rotary machine shown in FIG. It is a block diagram which shows the function structure of the rotary machine of 1st Embodiment. It is a flowchart which shows the process which a determination part performs. It is the elements on larger scale of the rotary machine of 2nd Embodiment. It is a block diagram which shows the function structure of the rotary machine of 3rd Embodiment.

First Embodiment
Hereinafter, a rotary machine 100 according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view in a plane orthogonal to the rotor (rotational shaft) 10 of the rotary machine 100 according to the first embodiment.
As shown in FIG. 1, the rotary machine 100 according to the present embodiment measures the rotor 10 having a circular cross-sectional view rotating around the rotation axis X, the housing 20 that accommodates the rotor 10 therein, the bearing portion 30, and And 40.
The rotary machine 100 of the present embodiment is, for example, a description of a rotor of a steam turbine used for geothermal power generation, thermal power generation or the like, but is not limited to the steam turbine. It may be another rotating machine having a bearing portion for rotatably supporting the rotating shaft, including a gas turbine, a blower and the like.

  As shown in FIG. 1, the housing 20 is formed in a cylindrical shape along the rotation axis X with the rotation axis X as a center, and the inner surface side thereof. A measuring member 21 is attached to the housing 20 for inserting the measuring unit 40 and setting it as a reference position of measurement. As shown in FIG. 1, the measurement member 21 moves to the left on the drawing sheet around the rotation axis X by an angle θ from the axis Y1 and the upper end position of the housing 20 through which the axis Y1 extending vertically upward from the rotation axis X passes. It is attached at three positions: a position through which the inclined axis Y2 passes, and a position through which an axis Y3 inclined to the right in the drawing about the rotational axis X from the axis Y1 by an angle θ. As shown in FIG. 2, the housing 20 is provided with a bearing stand 22 for mounting the bearing portion 30.

The bearing portion 30 is a member attached to the bearing stand 22 of the housing 20 and rotatably supporting the rotor 10. As shown in FIG. 1, in the present embodiment, the upper sleeve bearing 31 is disposed vertically above the rotor 10 and has an inner circumferential surface substantially the same diameter as the rotor 10, and vertically below the rotor 10. And a lower sleeve bearing 32 having an inner circumferential surface substantially the same diameter as the rotor 10. Lubricant oil is supplied to a gap between the inner peripheral surface of the bearing portion 30 and the outer peripheral surface of the rotor 10 by an oil supply nozzle (not shown).
In addition, although the bearing part 30 shown in FIG. 1 shall be two sleeve bearings arrange | positioned at the upper part and the lower part, another aspect may be sufficient and even if comprised from three pieces, four pieces, etc. Good. For example, it may be a tilting pad bearing in which bearing portions 30 are attached at a plurality of locations around the rotation axis X of the rotor 10 and can be swung at the position where they are attached.

  As shown in the enlarged view of FIG. 3, the measurement unit 40 includes a gauge rod 41, which is a rod-like member whose tip end contacts the rotor 10, and a dial gauge 42 attached to the base end of the gauge rod 41. The tip of the dial gauge 42 is movable along an axis Y1 along which the gauge rod 41 extends, and a scale is provided to indicate the distance from the tip of the dial gauge 42 to the tip of the gauge rod 41.

  As shown in FIG. 3, when the first distance L1 from the measurement member 21 provided on the outer periphery of the housing 20 to the outer peripheral surface 10 a of the rotor 10 is measured using the measurement unit 40, the worker measures the measurement unit 40. The gauge bar 41 is inserted into the insertion hole 21 a of the measuring member 21 attached to the vertical upper end position of the housing 20. Then, the operator tightens the dial gauge 42 in a state where there is a gap between the gauge rod 41 and the outer peripheral surface 10 a of the rotor 10, whereby the tip of the gauge rod 41 contacts the outer peripheral surface 10 a of the rotor 10. And, the tip of the dial gauge 42 is in contact with the measuring member 21. The operator measures the first distance L1 by reading the scale of the dial gauge 42 in this state. The first distance L1 is a distance along the axis Y1 between the measuring member 21 as the reference position of measurement and the outer peripheral surface of the rotor 10.

  Similarly, when measuring the second distance L2 from the measuring member 21 provided on the outer periphery of the housing 20 to the outer peripheral surface 10 a of the rotor 10 using the measuring unit 40, the operator uses the gauge rod 41 of the measuring unit 40. (For example, 30 to 60 degrees, preferably 45 degrees) from the axis Y1 inserted into the insertion hole 21a of the measuring member 21 attached at the position of the axis Y2 inclined to the left in the drawing about the rotational axis X Do. Then, the operator tightens the dial gauge 42 in a state where there is a gap between the gauge rod 41 and the outer peripheral surface of the rotor 10, whereby the tip of the gauge rod 41 contacts the outer peripheral surface 10a of the rotor 10, The tip of the dial gauge 42 is in contact with the measuring member 21. The operator measures the second distance L2 by reading the scale of the dial gauge 42 in this state. The second distance L2 is a distance along the axis Y2 between the measuring member 21 serving as a reference position for measurement and the outer peripheral surface of the rotor 10.

  Similarly, when the third distance L3 from the measuring member 21 provided on the outer periphery of the housing 20 to the outer peripheral surface 10a of the rotor 10 is measured using the measuring unit 40, the worker measures the gauge bar 41 of the measuring unit 40. (For example, 30 to 60 degrees, preferably 45 degrees) from the axis Y1 inserted into the insertion hole 21a of the measuring member 21 attached at the position of the axis Y3 inclined to the right in the drawing about the rotational axis X Do. Then, the operator tightens the dial gauge 42 in a state where there is a gap between the gauge rod 41 and the outer peripheral surface of the rotor 10, whereby the tip of the gauge rod 41 contacts the outer peripheral surface 10a of the rotor 10, The tip of the dial gauge 42 is in contact with the measuring member 21. The operator measures the third distance L3 by reading the scale of the dial gauge 42 in this state. The third distance L3 is a distance along the axis Y3 between the measuring member 21 as the reference position for measurement and the outer peripheral surface of the rotor 10.

  As described above, the measuring unit 40 sets the distance from the measuring member 21 provided on the outer periphery of the housing 20 to the outer peripheral surface 10 a of the rotor 10 to the first position P1 of the vertical upper end from the rotation axis X and the first position The measurement is performed at the second position P2 and the third position P3 which are inclined counterclockwise (to the left of the drawing) and clockwise (to the right of the drawing) around the rotation axis X from P1 by the angle θ.

  In the above description, although the first position P1 is to be measured from the measuring member 21 attached to the rotor 10 and the vertical upper end position of the housing 20, the first position P1 is perpendicular to the rotation axis X The measurement may be performed from the measurement member 21 attached to the lower end position. That is, the first position P1 can be either the vertical upper end or the vertical lower end of the rotation axis X. Even when the first position P1 is the lower end of the rotation axis X, the second position P2 and the third position P3 are inclined counterclockwise and clockwise by an angle θ around the rotation axis X from the first position P1. Position.

  When the measuring unit 40 measures the distance from the measuring member 21 provided on the outer periphery of the housing 20 to the outer peripheral surface 10 a of the rotor 10, the measuring unit 40 does not rotate the rotor 10. The tip is brought into contact with the outer peripheral surface 10 a of the rotor 10. This is effective to prevent the rotor 10 from being damaged by the rotation of the rotor 10 while the tip of the gauge rod 41 is in contact with the outer peripheral surface 10 a of the rotor 10.

  The measurement result of the distance from the measurement member 21 of the housing 20 by the measurement unit 40 to the outer peripheral surface 10a of the rotor 10 is measured by the operator reading the scale of the dial gauge 42, but the other It may be an aspect. For example, a signal corresponding to the numerical value of the scale of the dial gauge 42 may be output to the storage unit 60 described later.

Next, the functional configuration of the rotary machine 100 will be described with reference to FIG.
As shown in FIG. 4, the rotary machine 100 determines whether or not a predetermined wear state occurs in the bearing unit 30 based on the first distance L1, the second distance L2, and the third distance L3 measured by the measuring unit 40. And a storage unit 60 that stores the measurement result of the measurement unit 40.

  The determination unit 50 includes, for example, a central processing unit (CPU), a random access memory (RAM), a read only memory (ROM), a computer readable storage medium, and the like. Then, a series of processes for realizing various functions are stored in the form of a program, for example, in a storage medium or the like in the form of a program, and the CPU reads this program into a RAM or the like to execute information processing and arithmetic processing. Thus, various functions are realized.

When the operator reads the scale of the dial gauge 42 as the measurement result by the measurement unit 40, the numerical values of the first distance L1, the second distance L2, and the third distance L3 input by the operator via the input unit (not shown) Are stored in the storage unit 60.
On the other hand, when the measurement result by the measurement unit 40 is output as a signal, the numerical values of the first distance L1, the second distance L2, and the third distance L3 output from the measurement unit 40 are stored in the storage unit 60.

Next, a method of determining whether the predetermined wear state has occurred in the bearing unit 30 by the determination unit 50 will be described. FIG. 5 is a flowchart showing the process performed by the determination unit 50.
The measurement result by the measurement unit 40 is based on the point when management of the measurement result is started. When management of measurement results is started, a first initial value which is a first distance, a second initial value which is a second distance, and a third initial value which is a third distance are stored.

  In step S501, the measurement unit 40 stores the first distance L1 and stores the first distance L1 in the storage unit 60, and the determination unit 50 stores the first distance L1 stored in the storage unit 60. The first gap value G1 between the bearing portion 30 and the rotor 10 at the first position P1 is calculated by subtracting the first initial value from the first position value P1. In the present embodiment, the time when the measuring unit 40 measures at the first position P1 in the new state after replacement of the bearing unit 30 is used to set the time when management of the measurement result is started. The 1 distance L1 is a first initial value.

In addition, in step S501, the determination unit 50 subtracts the second initial value from the second distance L2 stored in the storage unit 60 to obtain the second gap between the bearing 30 and the rotor 10 at the second position P2. Calculate G2. Here, in the present embodiment, the second initial value is the second distance L2 measured at the second position P2 by the measuring unit 40 in a new state after replacement of the bearing unit 30.
In addition, in step S501, the determination unit 50 subtracts the third initial value from the third distance L3 stored in the storage unit 60 to obtain the third gap between the bearing unit 30 and the rotor 10 at the third position P3. Calculate G3. Here, in the present embodiment, the third initial value is the third distance L3 measured by the measuring unit 40 at the third position P3 in a new state after replacement of the bearing unit 30.

In step S502, the determination unit 50 calculates a fourth gap distance G4 from the second gap distance G2 and the third gap distance G3 calculated in step S501 using the following equation (1).
Here, the angle θ is an angle inclined from the axis line Y1 to the axis line Y2 and the axis line Y3 around the rotational axis X.
G4 = G2 · sin θ + G3 · sin θ (1)
The fourth gap G4 is an estimated value of the first gap G1 at the first position P1 calculated from the second gap G2 and the third gap G3.

  In step S503, the determination unit 50 determines whether the first gap distance G1 at the first position P1 calculated in step S501 exceeds the predetermined wear amount Gth. If YES, the process proceeds to step S504. If NO, the process proceeds to step S507.

  In step S504, the determination unit 50 determines whether the fourth gap G4 calculated in step S502 exceeds the predetermined wear amount Gth. If YES, the process proceeds to step S505, and NO is determined. The process proceeds to step S506.

When the determination unit 50 determines YES in step S504, the first gap interval G1 exceeds the predetermined wear amount Gth, and the fourth gap interval G4, which is an estimated value of the first gap interval G1, also exceeds the predetermined wear amount Gth. In order to indicate that, it means that the wear exceeding the predetermined wear amount Gth is surely generated in the bearing portion 30.
On the other hand, when the determination unit 50 determines NO in step S504, although the first gap distance G1 exceeds the predetermined wear amount Gth, the fourth gap distance G4, which is an estimated value of the first gap distance G1, is a predetermined wear amount Since it does not exceed Gth, it means that a failure different from the wear exceeding the predetermined wear amount Gth has occurred in the bearing portion 30. For example, in the case where the bearing unit 30 is a tilting pad bearing, it means that a failure or the like in which the bearing can not be rocked has occurred.

In step S505, since the determination unit 50 is generating wear that exceeds the predetermined wear amount Gth in the bearing unit 30, wear is generated in the bearing unit 30 of the rotary machine 100 and bearing wear occurs. Inform the worker that an inspection based on the premise is necessary.
On the other hand, in step S506, the determination unit 50 generates a failure in the bearing 30, which is different from the wear exceeding the predetermined wear amount Gth. The worker is notified that an inspection based on the premise that there is a failure other than wear is required.
When steps S505 and S506 end, the determination unit 50 ends the process of this flowchart.

  In step S507, the determination unit 50 determines whether the fourth gap G4 calculated in step S502 exceeds the predetermined wear amount Gth. If YES, the process proceeds to step S508, and NO is determined. The process advances to step S509.

When the determination unit 50 determines YES in step S507, although the first gap distance G1 does not exceed the predetermined wear amount Gth, the fourth gap distance G4, which is an estimated value of the first gap distance G1, does not exceed the predetermined wear amount Gth. In order to show that it exceeds, it means that the failure different from the wear which exceeds the predetermined amount of wear Gth has occurred in the bearing portion 30.
On the other hand, when the determination unit 50 determines NO in step S507, the first clearance G1 does not exceed the predetermined wear amount Gth, and the fourth clearance G4 which is an estimated value of the first clearance G1 is also predetermined. Since the wear amount Gth is not exceeded, it means that the wear exceeding the predetermined wear amount Gth has not occurred in the bearing portion 30.

  In step S508, since the failure that is different from the wear exceeding the predetermined wear amount Gth has occurred in the bearing unit 30, the determination unit 50 monitors the occurrence of the bearing failure and monitors the operation parameters of the rotary machine 100. Inform the worker that attention should be paid to recovery or deterioration such as a bearing failure condition in the bearing operation state. Here, the operating parameters are, for example, the vibration value of the rotary machine 100, the temperature of the bearing 30, the temperature of the lubricating oil that lubricates the bearing 30, and the like. The fact that the operation parameter should be monitored without notifying that the bearing portion 30 needs to be checked indicates that the first gap distance G1 does not exceed the predetermined wear amount Gth. This is because there is a high possibility that wear exceeding the predetermined wear amount Gth has not occurred in the bearing portion 30.

On the other hand, in step S509, since the determination unit 50 does not generate wear exceeding the predetermined wear amount Gth in the bearing unit 30, the bearing unit 30 is normal and inspection of the bearing unit 30 of the rotary machine 100 is unnecessary. Notify the worker to that effect.
When steps S508 and S509 end, the determination unit 50 ends the process of this flowchart.

  In addition, although each process shown in FIG. 5 demonstrated above shall be performed by the determination part 50 comprised from CPU etc., another aspect may be sufficient. For example, an operator operating the rotary machine 100 may perform each process illustrated in FIG. 5.

The operation and effects of the present embodiment described above will be described.
According to the rotary machine 100 according to one aspect of the present invention, the distance from the measuring member 21 provided on the outer periphery of the housing 20 to the outer peripheral surface 10a of the rotor 10 A first distance measured at one of the first positions P1 and a second distance measured at a second position P2 counterclockwise and clockwise about the rotational axis X by an angle θ from the first position P1 Based on the third distance measured at the third position P3, it is determined whether or not a predetermined wear state has occurred in the bearing portion 30. If a predetermined wear state is determined based on only the first distance L1 measured at the first position P1, a measurement error may occur due to any factor or a factor other than the wear of the bearing portion 30 may affect the measurement result. In some cases, it may be erroneously determined that the predetermined wear state is present. According to the rotary machine 100 according to the present embodiment, since the predetermined wear state is determined in consideration of the second distance L2 and the third distance L3 measured at the second position P2 and the third position P3, the bearing portion It is possible to reliably determine whether or not a predetermined wear state has occurred in 30, and to determine whether or not the bearing is in a failure state. Therefore, the necessity of the inspection work of the rotary machine 100 can be determined, the frequency of the inspection work of the rotary machine 100 can be reduced, and the stop period can be shortened.

In the rotary machine 100 according to the present embodiment, the determination unit 50 subtracts the first initial value from the first distance L1 to calculate the first gap distance G1 between the bearing portion 30 and the rotor 10 at the first position P1. Calculates the second gap distance G2 between the bearing 30 and the rotor 10 at the second position P2 by subtracting the second initial value from the second distance L2, and subtracts the third initial value from the third distance L3. Then, the third gap distance G3 between the bearing portion 30 and the rotor 10 at the third position P3 is calculated, and the bearing portion is calculated based on the first gap distance G1, the second gap distance G2 and the third gap distance G3. It is determined whether or not a predetermined wear state has occurred at 30.
The initial value is subtracted from the distance measured by the measurement unit 40 to calculate the gap distance between the bearing unit 30 and the rotor 10 at a plurality of locations of the first position P1, the second position P2, and the third position P3. Since the predetermined wear state is performed based on the above, whether or not the predetermined wear state occurs in the bearing portion 30 with the passage of time can be reliably determined based on the gap intervals at the plurality of positions.

In the rotary machine 100 according to the present embodiment, the measuring unit 40 brings the tip of the gauge rod 41 penetrating the housing 20 into contact with the outer peripheral surface 10 a of the rotor 10 in a state where the rotor 10 does not rotate. The distance to the outer peripheral surface 10a of the may be measured.
By doing this, the distance from the housing 20 to the outer peripheral surface 10a of the rotor 10 is made by a relatively simple structure in which the tip of the gauge rod 41 is brought into contact with the outer peripheral surface 10a of the rotor 10 by tightening the dial gauge 42. Can be measured. Further, since the measurement is performed in a state in which the rotor 10 does not rotate, the rotor 10 is not rotated while the tip of the gauge rod 41 is in contact with the outer peripheral surface 10 a of the rotor 10.

Second Embodiment
Next, a rotary machine 100A according to a second embodiment of the present invention will be described with reference to the drawings.
The present embodiment is a modification of the first embodiment, and is assumed to be the same as the first embodiment except in the case described below.
The measuring unit 40 according to the first embodiment brings the tip of the gauge rod 41 penetrating the housing 20 into contact with the outer peripheral surface 10 a of the rotor 10 in a state where the rotor 10 does not rotate. On the other hand, in the state where the rotor 10 rotates, the measuring unit 40A according to the present embodiment uses the non-contact distance measuring unit 43 attached to the tip of the gauge rod 41 penetrating the housing 20 to measure the distance from the distance measuring unit 43 The distance to the outer peripheral surface 10a of 10 is measured.

  As shown in the partial enlarged view of FIG. 6, the measuring unit 40A of this embodiment includes a gauge rod 41 which is a rod-like member, a dial gauge 42 attached to the base end of the gauge rod 41, and a tip end of the gauge rod 41. And a distance measuring unit 43 attached to the The tip of the dial gauge 42 is movable along the axis along which the gauge rod 41 extends, and a scale is provided to indicate the distance from the tip of the dial gauge 42 to the tip of the gauge rod 41. The distance measuring unit 43 is a noncontact sensor that measures the distance from the tip of the gauge rod 41 to the outer peripheral surface 10 a of the rotor 10 and outputs a signal corresponding to the measured distance.

  As shown in FIG. 6, the non-contact distance measuring unit 43 attached to the tip of the gauge rod 41 and the outer peripheral surface 10a of the rotor 10 are installed in a state where there is a gap distance without contacting. When measuring the first distance L1 from the measuring member 21 provided on the outer periphery of the housing 20 to the outer peripheral surface 10a of the rotor 10 using the measuring unit 40A, the operator rotates the gauge bar 41 of the measuring unit 40 It inserts in the insertion hole 21a of the member 21 for measurement attached to the perpendicular upper end position of the housing 20 from the center X. As shown in FIG.

  Then, the operator brings the tip end portion of the dial gauge 42 into contact with the measurement member 21 at the reference position. The operator measures the distance L11 from the measuring member 21 provided on the outer periphery of the housing 20 to the tip of the gauge bar 41 by reading the scale of the dial gauge 42 in this state. Further, the worker measures the distance L12 from the distance measurement unit 43 to the outer peripheral surface 10a of the rotor 10 by reading the signal output from the distance measurement unit 43, and adds it to the distance L11 to obtain the first distance L1. . Note that the measurement signal of the distance L12 output by the distance measurement unit 43 may be a signal indicating an average value of a plurality of measurement values or a maximum value of a plurality of measurement values.

  Similarly, when measuring the second distance L2 from the measuring member 21 provided on the outer periphery of the housing 20 to the outer peripheral surface 10a of the rotor 10 using the measuring unit 40A, the operator measures the gauge rod 41 of the measuring unit 40A. (For example, 30 to 60 degrees, preferably 45 degrees) from the axis Y1 inserted into the insertion hole 21a of the measuring member 21 attached at the position of the axis Y2 counterclockwise inclined around the rotation axis X Do. Then, the operator brings the tip end portion of the dial gauge 42 into contact with the measurement member 21 at the reference position.

  The operator reads the scale of the dial gauge 42 in this state to measure the distance L21 (not shown) from the measuring member 21 provided on the outer periphery of the housing 20 to the tip of the gauge rod 41. In addition, the worker measures the distance L22 (not shown) from the distance measurement unit 43 to the outer peripheral surface 10a of the rotor 10 by reading the signal output from the distance measurement unit 43, adds it to the distance L21, and The distance L2 is obtained.

  Similarly, when measuring the third distance L3 from the measuring member 21 provided on the outer periphery of the housing 20 to the outer peripheral surface 10a of the rotor 10 using the measuring unit 40A, the operator measures the gauge rod 41 of the measuring unit 40A. (E.g., 30 to 60 degrees, preferably 45 degrees) from the axis Y1 is inserted into the insertion hole 21a of the measuring member 21 attached at the position of the axis Y3 which is inclined clockwise about the rotation axis X. Then, the operator brings the tip of the dial gauge 42 into contact with the measuring member 21.

  The operator measures the distance L31 (not shown) from the measuring member 21 provided on the outer periphery of the housing 20 to the tip of the gauge bar 41 by reading the scale of the dial gauge 42 in this state. In addition, the worker measures the distance L32 (not shown) from the distance measurement unit 43 to the outer peripheral surface 10a of the rotor 10 by reading the signal output from the distance measurement unit 43, adds it to the distance L31, and The distance L3 is obtained.

  When the measuring unit 40A measures the distance from the measuring member 21 provided on the outer periphery of the housing 20 to the outer peripheral surface 10a of the rotor 10, the tip of the gauge bar 41 penetrating the housing 20 is rotated while the rotor 10 rotates. It can be inserted into the insertion hole 21a. This is because the distance measurement unit 43 is a noncontact sensor that outputs a signal according to the measured distance. The measurement by the measuring unit 40A is also possible in the state where the rotor 10 does not rotate.

  Further, the measurement result of the distance from the measurement member 21 provided on the outer periphery of the housing 20 by the measurement unit 40A to the tip end portion of the gauge rod 41 of the rotor 10 is measured by the operator reading the scale of the dial gauge 42 Although it shall be, it may be another aspect. For example, a signal corresponding to the numerical value of the scale of the dial gauge 42 may be output to the CPU or the like.

  According to the rotary machine 100A according to the present embodiment described above, since the distance from the distance measurement unit 43 to the outer peripheral surface 10a of the rotor 10 is measured by the non-contact distance measurement unit 43, There is no need to stop the rotary machine 100A even if it is present, it is possible to monitor the wear state, and the stop period of the rotary machine 100A can be shortened.

  Further, in order to measure the distance from the measuring member 21 provided on the outer periphery of the housing 20 to the outer peripheral surface 10 a of the rotor 10 in a state where the rotor 10 is supported by the bearing 30, the bearing operating state or bearing of the bearing 30 Since measurement during operation reflecting the oil level condition in part 30 is possible, reliable measurement is possible, and it is determined more reliably whether or not a predetermined wear state has occurred in bearing part 30. be able to.

Third Embodiment
Next, a rotary machine 100B according to a third embodiment of the present invention will be described with reference to the drawings.
The present embodiment is a modification of the first embodiment, and is assumed to be the same as the first embodiment except in the case described below.
The present embodiment predicts the replacement time of the bearing unit 30 in consideration of not only the current measurement result measured by the measurement unit 40 but also the wear management information associated with the determination result of the predetermined wear state in the past. It is.
FIG. 7 is a block diagram showing a functional configuration of the rotary machine 100B of the third embodiment. The functional configuration shown in FIG. 7 is obtained by adding a prediction unit 70 to the functional configuration shown in FIG.

  The storage unit 60 shown in FIG. 7 includes the determination result of the predetermined wear state determined by the determination unit 50 in the process shown in the flowchart of FIG. 5, the measurement result of the measuring unit 40 when the determination result is obtained, and the determination result The wear management information in which the operation parameters of the rotary machine 100B at the time of obtaining and the characteristic data of the rotary machine 100B are associated is stored. The storage unit 60 is a database storing a plurality of sets of wear management information corresponding to the determination results of the determination unit 50 a plurality of times.

  Here, the operating parameters of the rotary machine 100B include, for example, the vibration value of the rotary machine 100B, the temperature of the bearing 30, the temperature of the lubricating oil that lubricates the bearing 30, the rotational speed of the rotor 10, the fluctuation value of the rotational speed, etc. It is. Further, the characteristic data of the rotary machine 100B is data including the model of the rotary machine 100B and the model of the bearing unit 30.

  The prediction unit 70 predicts the replacement time of the bearing unit 30 based on the plurality of sets of wear management information stored in the storage unit 60 and the measurement result by the measurement unit 40. Specifically, the measuring unit 40 measures the distance from the measuring member 21 provided on the outer periphery of the housing 20 to the outer peripheral surface 10a of the rotor 10, and acquires the operation parameter of the rotary machine 100B.

  The plurality of sets of wear management information stored in the storage unit 60 correspond to the operation parameters of the rotary machine 100B with respect to temporal changes such as the first gap interval G1 and the fourth gap interval G4 according to the measurement result of the measurement unit 40. The data obtained by statistically processing the association are accumulated, and the bearing is referred to with reference to the correlation with the time until the first gap interval G1 or the fourth gap interval G4 exceeds the predetermined wear amount Gth by the measurement unit 40 Predict the replacement time of the part 30. Not only the current measurement result measured by the measurement unit 40 but also the wear management information associated with the determination result of the predetermined wear state in the past, the replacement time of the bearing unit 30 is predicted, so the past results It is possible to predict the appropriate replacement time according to the

10 rotor (rotary shaft)
DESCRIPTION OF SYMBOLS 10a Outer peripheral surface 20 Housing 21 Measurement member 22 Bearing stand 30 Bearing part 31 Upper sleeve bearing 32 Lower sleeve bearing 40, 40A Measurement part 41 Gauge rod (bar-like member)
42 dial gauge 43 distance measurement unit 50 determination unit 60 storage unit 70 prediction unit 100, 100A, 100B rotary machine X rotation axis Y1, Y2, Y3 axis

Claims (6)

A rotating shaft,
A housing for housing the rotary shaft therein;
A bearing unit attached to the housing and supporting the rotary shaft;
A measuring unit that measures distances to the outer peripheral surface of the rotary shaft with respect to a plurality of reference positions provided on the outer periphery of the housing;
And a determination unit that determines whether or not a predetermined wear state has occurred in the bearing based on measurement results at a plurality of the reference positions of the measurement unit.
The measurement results at the plurality of reference positions of the measurement unit are at least a first distance measured at a first position of either the vertical upper end or the vertical lower end from the rotation axis of the rotary shaft, the vertical upper end and And a second distance measured at a second position different from the vertical lower end. The measurement results of the plurality of reference positions of the measurement unit have a first initial value which is the first distance at the time of starting management of the measurement results, and a second initial value which is the second distance,
The determination unit subtracts the first initial value from the first distance to calculate a first gap distance between the bearing portion and the rotary shaft at the first position, and calculates the first gap distance from the second distance. A second initial value is subtracted to calculate a second gap distance between the bearing and the rotary shaft at the second position, and the first gap distance and the second gap distance are used to calculate the second gap distance. The rotating machine according to claim 1, wherein it is determined whether or not the predetermined wear state has occurred in the bearing portion.   The measurement unit causes the tip of a rod-shaped member penetrating the housing to contact the outer peripheral surface of the rotation shaft in a state where the rotation of the rotation shaft is stopped, thereby rotating the rotation from the reference position of the housing. The rotating machine according to claim 1, wherein a distance to an outer peripheral surface of the shaft is measured.   The measuring unit is a non-contact distance measuring unit attached to a tip of a rod-shaped member penetrating the housing in a state where the rotating shaft is rotating, and an outer peripheral surface of the rotating shaft from the distance measuring unit The rotary machine according to claim 1 or 2, wherein the distance to the end is measured. Corresponds to the determination result for the occurrence of the predetermined wear state determined by the determination unit, the measurement result of the measurement unit when the determination result is obtained, and the operation parameter of the rotary machine when the determination result is obtained A storage unit for storing the wear management information
The prediction part which predicts the replacement time of the said bearing part based on the said wear management information memorize | stored in the said memory | storage part, and the measurement result by the said measurement part is provided. The rotary machine described in. A method of determining a worn state of a rotary machine, comprising: a rotary shaft; a housing for housing the rotary shaft therein; and a bearing unit attached to the housing and supporting the rotary shaft;
A measuring step of measuring distances to the outer peripheral surface of the rotary shaft with respect to a plurality of reference positions provided on the outer periphery of the housing;
A determination step of determining whether or not a predetermined wear state has occurred in the bearing based on measurement results at a plurality of the reference positions of the measurement step;
The measurement results of the plurality of reference positions in the measurement step are at least a first distance measured at a first position of either the vertical upper end or the vertical lower end from the rotational axis of the rotary shaft, the vertical upper end and the vertical A wear state determination method comprising: a second distance measured at a second position different from the lower end.

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