JP7009222B2 - Rotating machine and wear condition judgment method - Google Patents

Description

The present invention relates to a rotating machine and a method for determining a wear state.

Conventionally, for example, a rotary machine to which a blade is attached and rotates is provided with a rotor (rotary shaft body) having a large diameter and a large bearing portion for supporting the rotor. In checking the wear state of the bearing portion, after stopping the rotating machine, the bearing base and the bearing may be opened to measure the bearing pad itself. In order to measure the bearing pad itself, in addition to each opening work, reverse assembly work and realignment work are required, which requires many steps and many hours. Therefore, for example, Patent Document 1 is known as a method for measuring a wear state of a bearing portion without opening a bearing base and a bearing. Patent Document 1 discloses that the amount of wear 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.

Japanese Patent No. 3806500

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 the 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, even though the bearing part is not worn to a predetermined state, the rotating machine is stopped and the bearing part is inspected, which requires a large amount of inspection work and the stopping period of the rotating machine is long. There is a problem that time is required.

The present invention has been made in view of such circumstances, and it is surely determined whether or not a predetermined wear state has occurred in the bearing portion, the frequency of inspection work is reduced, and the stop period is shortened. It is an object of the present invention to provide a rotating machine capable of determining a wear state and a method for determining a wear state.

In order to solve the above problems, the rotary machine of the present invention employs the following means.
The rotary machine according to one aspect of the present invention includes a rotary shaft body, a housing for accommodating the rotary shaft body, a bearing portion attached to the housing and supporting the rotary shaft body, and an outer periphery of the housing. Based on the measurement unit that measures the distance to the outer peripheral surface of the rotating shaft body with respect to the plurality of provided reference positions and the measurement results at the plurality of reference positions of the measurement unit, the bearing portion is in a predetermined wear state. The measurement result is measured at least at the first position of either the vertical upper end or the vertical lower end from the rotation axis center of the rotation axis body. It includes one distance and a second distance measured at a second position different from the vertical upper end and the vertical lower end.

According to the rotary machine according to one aspect of the present invention, the distance from a plurality of reference positions provided on the outer peripheral surface of the housing to the outer peripheral surface of the rotary shaft body is set to either the vertical upper end or the vertical lower end from the rotation axis center of the rotary shaft body. Based on the first distance measured at one of the first positions 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 portion. do. If a predetermined wear state is determined based only on the first distance measured at the first position, a measurement error may occur for some reason, or a factor other than the wear of the bearing may affect the measurement result. There is a possibility that it will be erroneously determined to be in a predetermined wear state. According to the rotary machine according to one aspect of the present invention, since the predetermined wear state is determined in consideration of the second distance measured at the second position, whether or not the predetermined wear state has occurred in the bearing portion. Can be reliably determined. Therefore, the frequency of inspection work can be reduced and the stop period of the rotating machine can be shortened.

In the rotary machine according to one aspect of the present invention, the measurement results are the first initial value which is the first distance at the time when the management of the measurement result is started and the second initial value which is the second distance. The determination unit subtracts the first initial value from the first distance to calculate the first gap distance between the bearing unit and the rotating shaft body at the first position, and calculates the first clearance. The second initial value is subtracted from the two distances to calculate the second clearance between the bearing and the rotating shaft at the second position, and the first clearance is estimated from the second clearance. The value is calculated, and when both the estimated value of the first gap interval and the estimated value of the first gap interval exceed the predetermined wear amount, it is determined that the wear exceeding the predetermined wear amount has occurred in the bearing portion.
The initial value is subtracted from the distance measured by the measuring unit to calculate the clearance between the bearing and the rotating shaft at multiple locations including the first and second positions, and the gap between the second and the first gap is calculated. Since the determination unit determines whether or not wear exceeding the predetermined amount of wear has occurred based on the estimated values of, it is determined whether or not wear exceeding the predetermined amount of wear has occurred in the bearing unit over time. It is possible to make a reliable determination based on the gap spacing at a plurality of positions.

In the rotating machine according to one aspect of the present invention, the measuring unit brings the tip of a rod-shaped member penetrating the housing into contact with 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 rotating shaft body may be measured.
By doing so, the distance from the housing to the outer peripheral surface of the rotating shaft body can be measured by a relatively simple structure in which the tip of the rod-shaped member is brought into contact with the outer peripheral surface of the rotating shaft body. In addition, since the measurement is performed while the rotation of the rotating shaft is stopped, the rotating shaft rotates while the tip of the rod-shaped member is in contact with the outer peripheral surface of the rotating shaft, causing a problem that the rotating shaft is damaged. 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 the tip of a rod-shaped member penetrating the housing while the rotating shaft is rotating. The distance from the distance measuring unit to the outer peripheral surface of the rotating 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 type distance measuring unit, it is not necessary to stop the rotating machine even when measuring by the measuring unit, and the stop period of the rotating machine can be set. Can be shortened. In addition, in order to measure the distance to the outer peripheral surface of the rotating shaft while the rotating shaft is supported by the bearing, measurement during operation that reflects the operating status of the bearing and the oil level at the bearing. Therefore, highly reliable measurement is possible, and it is possible to more reliably determine 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. Based on the storage unit that stores the wear management information associated with the operation parameters of the rotary machine at the time of obtaining, the wear management information stored in the storage unit, and the measurement result by the measurement unit. It may be provided with a prediction unit that predicts the replacement time of the bearing unit.
By doing so, the replacement time of the bearing part is predicted in consideration of not only the current measurement result measured by the measuring 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 past results, and it is possible to plan in advance the timing of maintenance work and the preparation of replacement parts that require delivery time.

The wear state determination method according to one aspect of the present invention includes a rotary shaft, a housing for accommodating the rotary shaft, and a bearing portion attached to the housing and supporting the rotary shaft. A method for determining a wear state of a machine, which is a measurement step of measuring a distance to an 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 plurality of reference positions of the measurement step. A determination step of determining whether or not a predetermined wear state has occurred in the bearing portion based on the measurement result in the above is provided, and the measurement result is at least the vertical upper end of the rotating shaft body. Alternatively, the first distance measured at the first position of either one of the vertical lower ends and the second distance measured at the second position different from the vertical upper end and the vertical lower end are provided , and a plurality of the reference points of the measuring process. The position measurement result has a first initial value which is the first distance at the time when the management of the measurement result is started and a second initial value which is the second distance, and the determination step is the first. The first initial value is subtracted from the distance to calculate the first gap distance between the bearing portion and the rotating shaft body at the first position, and the second initial value is subtracted from the second distance. The second gap interval between the bearing portion and the rotating shaft body at the second position is calculated, the estimated value of the first gap interval is calculated from the second gap interval, and the first gap interval and the said. When both of the estimated values of the first gap spacing exceed the predetermined wear amount, it is determined that the wear exceeding the predetermined wear amount has occurred in the bearing portion .

According to the wear state determination method according to one aspect of the present invention, the distance from a plurality of reference positions provided on the outer peripheral surface of the housing to the outer peripheral surface of the rotating shaft body is set to the vertical upper end or the vertical lower end from the rotation axis center of the rotating shaft body. A determination step of determining whether or not a predetermined wear state has occurred in the bearing portion based on the first distance measured at one of the first positions and the second distance measured at a second position different from the first position. Can be determined. If a predetermined wear state is determined based only on the first distance measured at the first position, a measurement error may occur for some reason, or a factor other than the wear of the bearing may affect the measurement result. Even if there is, there is a possibility that it will be erroneously determined that it is in a predetermined wear state. According to the wear state determination method according to one aspect of the present invention, since the predetermined wear state is determined in consideration of the second distance measured at the second position, is the predetermined wear state generated in the bearing portion? Whether or not it can be reliably determined. Therefore, by this wear state determination method, the stop period of the rotating machine can be shortened and the frequency of inspection work can be reduced.

According to the present invention, there is a rotating machine and a wear state determination method capable of reliably determining whether or not a predetermined wear state has occurred in a bearing portion, reducing the frequency of inspection work, and shortening the stop period. Can be provided.

It is sectional drawing in the plane orthogonal to the rotor of the rotary machine of 1st Embodiment. FIG. 3 is a cross-sectional view taken along the line I-I of the rotary machine shown in FIG. It is a partially enlarged view of the rotary machine shown in FIG. It is a block diagram which shows the functional structure of the rotary machine of 1st Embodiment. It is a flowchart which shows the process which a determination part executes. It is a partially enlarged view of the rotary machine of the 2nd Embodiment. It is a block diagram which shows the functional structure of the rotary machine of 3rd Embodiment.

[First Embodiment]
Hereinafter, the rotary machine 100 according to the first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of the rotary machine 100 of the first embodiment in a plane orthogonal to the rotor (rotary axis) 10.
As shown in FIG. 1, in the rotary machine 100 of the present embodiment, a rotor 10 having a circular cross-sectional view that rotates around the rotation axis X, a housing 20 that houses the rotor 10 inside, and a bearing portion 30 are measured. A unit 40 is provided.
The rotary machine 100 of the present embodiment is described for, for example, 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 rotary machine having a bearing portion that rotationally supports the rotary shaft, including a gas turbine and a blower.

As shown in FIG. 1, the housing 20 is formed in a cylindrical shape on the inner surface side thereof along the rotation axis X with the rotation axis X as the center. A measurement member 21 for inserting the measurement unit 40 and setting it as a reference position for measurement is attached to the housing 20. As shown in FIG. 1, the measuring member 21 is left on the paper surface around the rotation axis X by an angle θ with 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 where the inclined axis Y2 passes and a position where the axis Y3 inclined to the right of the paper surface around the rotation axis X by an angle θ from the axis Y1 passes. As shown in FIG. 2, the housing 20 is provided with a bearing base 22 for mounting the bearing portion 30.

The bearing portion 30 is a member that is attached to the bearing base 22 of the housing 20 and rotationally supports the rotor 10. As shown in FIG. 1, in the present embodiment, the bearing portion 30 is arranged vertically above the rotor 10 and has an inner peripheral surface having an inner peripheral surface having substantially the same diameter as the rotor 10, and the bearing portion 30 is vertically below the rotor 10. A lower sleeve bearing 32 having an inner peripheral surface having substantially the same diameter as the rotor 10 is provided. Lubricating oil is supplied to the gap between the inner peripheral surface of the bearing portion 30 and the outer peripheral surface of the rotor 10 by a lubrication nozzle (not shown).
The bearing portion 30 shown in FIG. 1 is assumed to be two sleeve bearings arranged at the upper part and the lower part, but may have other embodiments or may be composed of three, four or the like. good. For example, a tilting pad bearing may be a tilting pad bearing in which bearing portions 30 are attached to a plurality of locations around the rotation axis X of the rotor 10 and can swing at the positions where the bearing portions 30 are attached.

As shown in the enlarged view of FIG. 3, the measuring unit 40 includes a gauge rod 41, which is a rod-shaped member whose tip is in contact with 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 the axis Y1 on which the gauge bar 41 extends, and a scale is provided to display the distance from the tip of the dial gauge 42 to the tip of the gauge bar 41.

As shown in FIG. 3, when 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 is measured by using the measuring unit 40, the operator is the measuring unit 40. The gauge rod 41 of the above is inserted into the insertion hole 21a of the measuring member 21 attached to the vertical upper end position of the housing 20. Then, the operator tightens the dial gauge 42 with the gauge rod 41 in a state where there is a gap between the gauge rod 41 and the outer peripheral surface 10a of the rotor 10, so that the tip end portion of the gauge rod 41 comes into contact with the outer peripheral surface 10a of the rotor 10. In addition, 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 measurement member 21 which is the reference position for measurement and the outer peripheral surface of the rotor 10.

Similarly, when 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 is measured by using the measuring unit 40, the operator is the gauge rod 41 of the measuring unit 40. Is inserted into the insertion hole 21a of the measuring member 21 attached at the position of the axis Y2 inclined to the left of the paper surface around the rotation axis X by an angle θ (for example, 30 degrees to 60 degrees, preferably 45 degrees) from the axis Y1. do. Then, the operator tightens the dial gauge 42 with the gauge rod 41 in a state where there is a gap between the gauge rod 41 and the outer peripheral surface of the rotor 10, so that the tip end portion of the gauge rod 41 comes into contact with the outer peripheral surface 10a of the rotor 10 and 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 measurement member 21 which is the 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 by using the measuring unit 40, the operator is the gauge rod 41 of the measuring unit 40. Is inserted into the insertion hole 21a of the measuring member 21 attached at the position of the axis Y3 inclined to the right of the paper surface around the rotation axis X by an angle θ (for example, 30 degrees to 60 degrees, preferably 45 degrees) from the axis Y1. do. Then, the operator tightens the dial gauge 42 with the gauge rod 41 in a state where there is a gap between the gauge rod 41 and the outer peripheral surface of the rotor 10, so that the tip end portion of the gauge rod 41 comes into contact with the outer peripheral surface 10a of the rotor 10 and 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 measurement member 21 which is 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 10a of the rotor 10 at the first position P1 at the upper end vertically from the rotation axis X and the first position. Measurement is performed at the second position P2 and the third position P3 tilted counterclockwise (to the left of the paper) and clockwise (to the right of the paper) by an angle θ from P1 about the axis of rotation X.

In the above description, the first position P1 is measured from the measuring member 21 attached to the rotor 10 and the vertical upper end position of the housing 20, but the first position P1 is vertical from the rotation axis X. 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 vertical 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 from the first position P1 around the rotation axis X. It becomes the position that was done.

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 10a of the rotor 10, the gauge rod 41 penetrating the housing 20 in a state where the rotor 10 does not rotate. The tip is brought into contact with the outer peripheral surface 10a of the rotor 10. This is effective in preventing a problem that the rotor 10 is rotated while the tip of the gauge rod 41 is in contact with the outer peripheral surface 10a of the rotor 10 and the rotor 10 is damaged.

Further, the measurement result of the distance from the measuring member 21 of the housing 20 to the outer peripheral surface 10a of the rotor 10 by the measuring unit 40 is measured by the operator reading the scale of the dial gauge 42, but other It may be an embodiment. For example, a signal corresponding to the numerical value on 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, in the rotary machine 100, whether or not a predetermined wear state has occurred in the bearing portion 30 based on the first distance L1, the second distance L2, and the third distance L3 measured by the measuring unit 40. It is provided with a determination unit 50 for determining whether or not, and a storage unit 60 for storing the measurement result by the measurement unit 40.

The determination unit 50 is composed of, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a computer-readable storage medium, and the like. As an example, a series of processes for realizing various functions are stored 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 / arithmetic processing. As a result, various functions are realized.

When the operator reads the scale of the dial gauge 42 from the measurement result by the measuring 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). Is stored in the storage unit 60.
On the other hand, when the measurement result by the measuring 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 measuring unit 40 are stored in the storage unit 60.

Next, a method of determining whether or not a predetermined wear state has occurred in the bearing portion 30 by the determination unit 50 will be described. FIG. 5 is a flowchart showing a process executed by the determination unit 50.
The measurement result by the measurement unit 40 is based on the time when the management of the measurement result is started. When the management of the measurement result is started, the first initial value which is the first distance, the second initial value which is the second distance, and the third initial value which is the third distance are stored.

With respect to the measurement result by the measurement unit 40 this time, in step S501, the measurement unit 40 stores the first distance L1 and stores it in the storage unit 60, and the determination unit 50 stores the first distance L1 stored in the storage unit 60. The first initial value is subtracted from the above to calculate the first clearance G1 between the bearing portion 30 and the rotor 10 at the first position P1. In the present embodiment, when the time when the management of the measurement result is started is used as a reference, the time when the measurement unit 40 measures at the first position P1 in the new state after the replacement of the bearing unit 30 is used. One distance L1 is the first initial value.

Further, in step S501, the determination unit 50 subtracts the second initial value from the second distance L2 stored in the storage unit 60, and the second gap distance between the bearing unit 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 by the measuring unit 40 at the second position P2 in a new state after the replacement of the bearing unit 30.
Further, in step S501, the determination unit 50 subtracts the third initial value from the third distance L3 stored in the storage unit 60, and the third gap distance 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 the replacement of the bearing unit 30.

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

In step S503, the determination unit 50 determines whether or not the first gap interval G1 at the first position P1 calculated in step S501 exceeds the predetermined wear amount Gth, and if YES, proceeds to step S504. If it is determined as NO, the process proceeds to step S507.

In step S504, the determination unit 50 determines whether or not the fourth gap interval G4 calculated in step S502 exceeds the predetermined wear amount Gth, and if it is determined to be YES, the process proceeds to step S505, and if it is determined to be NO. Proceeds to step S506.

When the determination unit 50 determines YES in step S504, the first gap gap G1 exceeds the predetermined wear amount Gth, and the fourth gap gap G4, which is an estimated value of the first gap gap G1, also exceeds the predetermined wear amount Gth. In order to show that the bearing portion 30 is worn, it means that the bearing portion 30 is surely worn in excess of the predetermined wear amount Gth.
On the other hand, when the determination unit 50 determines NO in step S504, although the first gap gap G1 exceeds the predetermined wear amount Gth, the fourth gap gap G4, which is an estimated value of the first gap gap G1, is the predetermined wear amount. Since it does not exceed Gth, it means that the bearing portion 30 has a failure different from the wear exceeding the predetermined wear amount Gth. For example, when the bearing portion 30 is a tilting pad bearing, it means that the bearing has a defect that makes it impossible to swing.

In step S505, since the bearing portion 30 is worn in excess of the predetermined wear amount Gth, the bearing portion 50 is in bearing wear, and the bearing portion 30 of the rotary machine 100 is worn. Notify the operator that the inspection is necessary on the premise that the bearing is present.
On the other hand, in step S506, since the bearing portion 30 has a failure different from the wear exceeding the predetermined wear amount Gth, the bearing failure has occurred and the bearing portion 30 of the rotary machine 100 has a failure. Notify the operator that an inspection is required on the premise that a failure other than wear has occurred.
When the steps S505 and S506 are completed, the determination unit 50 ends the processing of this flowchart.

In step S507, the determination unit 50 determines whether or not the fourth gap interval G4 calculated in step S502 exceeds the predetermined wear amount Gth, and if it is determined to be YES, the process proceeds to step S508, and if it is determined to be NO. Proceeds to step S509.

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

In step S508, the determination unit 50 monitors the bearing failure and the operating parameters of the rotary machine 100 because the bearing section 30 has a failure different from the wear exceeding the predetermined wear amount Gth. , Notify the operator that attention should be paid to recovery or deterioration of the bearing failure situation in the bearing operating state. Here, the operating parameters are, for example, the vibration value of the rotary machine 100, the temperature of the bearing portion 30, the temperature of the lubricating oil for lubricating the bearing portion 30, and the like. Notifying that the operating parameters should be monitored without notifying that the bearing portion 30 needs to be inspected indicates that the first clearance gap G1 does not exceed the predetermined wear amount Gth. Therefore, there is a high possibility that the bearing portion 30 is not worn in excess of the predetermined wear amount Gth.

On the other hand, in step S509, since the bearing portion 30 is not worn in excess of the predetermined wear amount Gth, the bearing portion 30 is normal and the bearing portion 30 of the rotary machine 100 does not need to be inspected. Notify the worker to that effect.
When the steps S508 and S509 are completed, the determination unit 50 ends the processing of this flowchart.

Although each process shown in FIG. 5 described above is executed by the determination unit 50 composed of a CPU or the like, other modes may be used. For example, each process shown in FIG. 5 may be performed by a worker who operates the rotary machine 100.

The operation and effect 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 is set to the vertical upper end or the vertical lower end of the rotor 10 from the rotation axis X. The first distance measured at the first position P1 of any one of the above, and the second distance measured at the second position P2 inclined counterclockwise and clockwise by the angle θ from the first position P1. And, 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. When a predetermined wear state is determined based only on the first distance L1 measured at the first position P1, if a measurement error occurs for some reason or a factor other than the wear of the bearing portion 30 affects the measurement result. There is a possibility that it will be erroneously determined to be in a predetermined wear state. 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 further determine whether or not the bearing is in a defective state. Therefore, it is possible to determine whether or not the inspection work of the rotary machine 100 is necessary, 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 clearance G1 between the bearing unit 30 and the rotor 10 at the first position P1. Then, the second initial value is subtracted from the second distance L2 to calculate the second gap gap G2 between the bearing portion 30 and the rotor 10 at the second position P2, and the third initial value is subtracted from the third distance L3. Then, the third gap gap G3 between the bearing portion 30 and the rotor 10 at the third position P3 is calculated, and the bearing portion is based on the first gap gap G1, the second gap gap G2, and the third gap gap G3. It is determined whether or not a predetermined wear state has occurred in 30.
The initial value is subtracted from the distance measured by the measuring unit 40 to calculate the clearance 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 formed based on the above, it is possible to reliably determine whether or not the predetermined wear state has occurred in the bearing portion 30 over time based on the gap spacing 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 10a of the rotor 10 from the housing 20 to the rotor 10 in a state where the rotor 10 does not rotate. The distance to the outer peripheral surface 10a may be measured.
By doing so, the distance from the housing 20 to the outer peripheral surface 10a of the rotor 10 is provided 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 where the rotor 10 does not rotate, the rotor 10 does not rotate while the tip of the gauge rod 41 is in contact with the outer peripheral surface 10a of the rotor 10, and the rotor 10 is not damaged.

[Second Embodiment]
Next, the rotary machine 100A according to the second embodiment of the present invention will be described with reference to the drawings.
This embodiment is a modification of the first embodiment, and is the same as the first embodiment except for the cases described below.
In the measuring unit 40 of the first embodiment, the tip of the gauge rod 41 penetrating the housing 20 is brought into contact with the outer peripheral surface 10a of the rotor 10 in a state where the rotor 10 does not rotate. On the other hand, in the measuring unit 40A of the present embodiment, when the rotor 10 is rotating, the distance measuring unit 43 is connected to the rotor by the non-contact type distance measuring unit 43 attached to the tip of the gauge rod 41 penetrating the housing 20. The distance to the outer peripheral surface 10a of 10 is measured.

As shown in the partially enlarged view of FIG. 6, the measuring unit 40A of the present embodiment includes a gauge rod 41 which is a rod-shaped member, a dial gauge 42 attached to a base end portion of the gauge rod 41, and a tip portion of the gauge rod 41. It is provided with a distance measuring unit 43 attached to the above. The tip of the dial gauge 42 is movable along the axis on which the gauge bar 41 extends, and a scale is provided to display the distance from the tip of the dial gauge 42 to the tip of the gauge bar 41. The distance measuring unit 43 is a non-contact type sensor that measures the distance from the tip end portion of the gauge rod 41 to the outer peripheral surface 10a of the rotor 10 and outputs a signal corresponding to the measured distance.

As shown in FIG. 6, the non-contact type 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 contact. When 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 is measured by using the measuring unit 40A, the operator rotates the gauge rod 41 of the measuring unit 40 as a rotating shaft. It is inserted from the center X into the insertion hole 21a of the measuring member 21 attached to the vertical upper end position of the housing 20.

Then, the operator makes the tip of the dial gauge 42 in contact with the measuring member 21 at the reference position. By reading the scale of the dial gauge 42 in this state, 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 rod 41. Further, the operator measures the distance L12 from the distance measuring unit 43 to the outer peripheral surface 10a of the rotor 10 by reading the signal output by the distance measuring unit 43, and adds it to the distance L11 to obtain the first distance L1. .. The measurement signal of the distance L12 output by the distance measuring unit 43 may be a signal indicating an average value of a plurality of measured values or a maximum value of a plurality of measured values.

Similarly, when 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 is measured by using the measuring unit 40A, the operator is the gauge rod 41 of the measuring unit 40A. Is inserted into the insertion hole 21a of the measuring member 21 attached at the position of the axis Y2 tilted counterclockwise around the axis of rotation X by an angle θ (for example, 30 degrees to 60 degrees, preferably 45 degrees) from the axis Y1. do. Then, the operator makes the tip of the dial gauge 42 in contact with the measuring member 21 at the reference position.

By reading the scale of the dial gauge 42 in this state, the operator measures 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. Further, the operator measures the distance L22 (not shown) from the distance measuring unit 43 to the outer peripheral surface 10a of the rotor 10 by reading the signal output by the distance measuring unit 43, and adds the distance L22 to the second distance L21. Obtain the distance L2.

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 by using the measuring unit 40A, the operator is the gauge rod 41 of the measuring unit 40A. 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 by an angle θ (for example, 30 degrees to 60 degrees, preferably 45 degrees) from the axis Y1. Then, the operator makes the tip of the dial gauge 42 in contact with the measuring member 21.

By reading the scale of the dial gauge 42 in this state, 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 rod 41. Further, the operator measures the distance L32 (not shown) from the distance measuring unit 43 to the outer peripheral surface 10a of the rotor 10 by reading the signal output by the distance measuring unit 43, and adds it to the distance L31 to obtain a third. Obtain the distance L3.

When measuring 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 measuring unit 40A presses the tip of the gauge rod 41 penetrating the housing 20 while the rotor 10 is rotating. It can be inserted into the insertion hole 21a. This is because the distance measuring unit 43 is a non-contact type sensor that outputs a signal corresponding to the measured distance. The measurement by the measuring unit 40A is possible even when the rotor 10 does not rotate.

Further, the measurement result of the distance from the measuring member 21 provided on the outer periphery of the housing 20 by the measuring unit 40A to the tip of the gauge rod 41 of the rotor 10 is measured by the operator reading the scale of the dial gauge 42. However, other embodiments may be used. For example, a signal corresponding to the numerical value on 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 measuring unit 43 to the outer peripheral surface 10a of the rotor 10 is measured by the non-contact type distance measuring unit 43, the measurement by the measuring unit 40A is performed. Even if there is, it is not necessary to stop the rotary machine 100A, the wear state can be monitored, 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 10a of the rotor 10 in the situation where the rotor 10 is supported by the bearing portion 30, the bearing operating state of the bearing portion 30 and the bearing are measured. Since it is possible to perform measurement during operation that reflects the oil level condition in the portion 30, highly reliable measurement is possible, and it is more reliably determined whether or not a predetermined wear state has occurred in the bearing portion 30. be able to.

[Third Embodiment]
Next, the rotary machine 100B according to the third embodiment of the present invention will be described with reference to the drawings.
This embodiment is a modification of the first embodiment, and is the same as the first embodiment except for the cases described below.
In this embodiment, not only the current measurement result measured by the measuring unit 40 but also the wear management information associated with the determination result of the predetermined wear state in the past is taken into consideration to predict the replacement time of the bearing unit 30. 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 the prediction unit 70 to the functional configuration shown in FIG.

The storage unit 60 shown in FIG. 7 has a determination result of a predetermined wear state determined by the determination unit 50 in the process shown in the flowchart of FIG. 5, a measurement result of the measurement unit 40 when the determination result is obtained, and a determination result. The wear management information in which the operation parameter of the rotary machine 100B and the characteristic data of the rotary machine 100B are associated with each other is stored. The storage unit 60 is a database that stores a plurality of sets of wear management information corresponding to a plurality of determination results by the determination unit 50.

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 portion 30, the temperature of the lubricating oil that lubricates the bearing portion 30, the rotation speed of the rotor 10, and the fluctuation value of the rotation speed. 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 portion 30.

The prediction unit 70 predicts the replacement time of the bearing unit 30 based on a 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 operating parameters of the rotary machine 100B.

The plurality of sets of wear management information stored in the storage unit 60 are the operation parameters of the rotary machine 100B with respect to changes over time such as the first gap interval G1 and the fourth gap interval G4 according to the measurement result of the measurement unit 40. Data that has been statistically processed for the relationship between Predict the replacement time of the part 30. Since the replacement time of the bearing unit 30 is predicted in consideration of not only the current measurement result measured by the measuring unit 40 but also the wear management information associated with the determination result of the predetermined wear state in the past, the past results. It is possible to predict the appropriate replacement time according to the situation.

10 Rotor (rotary shaft)
10a Outer peripheral surface 20 Housing 21 Measuring member 22 Bearing base 30 Bearing part 31 Upper sleeve bearing 32 Lower sleeve bearing 40, 40A Measuring part 41 Gauge rod (rod-shaped member)
42 Dial gauge 43 Distance measurement unit 50 Judgment unit 60 Storage unit 70 Prediction unit 100, 100A, 100B Rotating machine X Rotating axis Y1, Y2, Y3 Axis line

Claims (7)

Rotating shaft and
A housing for accommodating the rotating shaft body inside, and
A bearing portion that is attached to the housing and supports the rotating shaft body,
A measuring unit that measures the distance to the outer peripheral surface of the rotating shaft body with respect to a plurality of reference positions provided on the outer peripheral surface of the housing.
A determination unit for determining whether or not a predetermined wear state has occurred in the bearing unit based on the measurement results of the plurality of measurement units at the reference position is provided.
The measurement results are obtained at least at the first distance measured at the first position of either the vertical upper end or the vertical lower end from the rotation axis center of the rotary shaft body, and at the second position different from the vertical upper end and the vertical lower end. Equipped with the measured second distance
The measurement result has a first initial value which is the first distance at the time when the management of the measurement result is started, and a second initial value which is the second distance.
The determination unit
The first gap distance between the bearing portion and the rotating shaft body at the first position is calculated by subtracting the first initial value from the first distance.
The second initial value is subtracted from the second distance to calculate the second gap distance between the bearing portion and the rotating shaft body at the second position.
An estimated value of the first gap interval is calculated from the second gap interval, and the estimated value is calculated.
A rotary machine that determines that wear exceeding the predetermined wear amount has occurred in the bearing portion when both the first gap interval and the estimated value of the first gap interval exceed the predetermined wear amount. In the determination unit, when the first gap interval exceeds the predetermined wear amount, but the estimated value of the first gap interval does not exceed the predetermined wear amount, the bearing portion is subjected to wear exceeding the predetermined wear amount. The rotary machine according to claim 1, wherein it is determined that a different failure has occurred. The measuring unit rotates from the reference position of the housing by bringing the tip of the rod-shaped member penetrating the housing into contact with the outer peripheral surface of the rotating shaft while the rotation of the rotating shaft is stopped. The rotary machine according to claim 1 or 2, wherein the distance to the outer peripheral surface of the shaft body is measured. In a state where the rotating shaft body is rotating, the measuring unit is a non-contact type distance measuring unit attached to the tip of a rod-shaped member penetrating the housing, from the distance measuring unit to the outer peripheral surface of the rotating shaft body. The rotary machine according to claim 1 or 2, wherein the distance to the machine is measured. 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 that stores the corresponding wear management information,
Any one of claims 1 to 4, comprising a prediction unit that predicts the replacement time of the bearing unit based on the wear management information stored in the storage unit and the measurement result by the measurement unit. Rotating machine as described in the section. A method for determining a wear state of a rotating machine including a rotating shaft body, a housing that houses the rotating shaft body, and a bearing portion that is attached to the housing and supports the rotating shaft body.
A measurement step of measuring the distance to the outer peripheral surface of the rotating shaft body with respect to a plurality of reference positions provided on the outer peripheral surface of the housing, and a measurement step.
A determination step of determining whether or not a predetermined wear state has occurred in the bearing portion based on the measurement results of the plurality of measurement steps at the reference position is provided.
The measurement result is the first distance measured at least at the first position of either the vertical upper end or the vertical lower end from the rotation axis center of the rotary shaft body, and the second vertical upper end and the vertical lower end are different from each other. Equipped with a second distance measured at the position ,
The measurement result has a first initial value which is the first distance at the time when the management of the measurement result is started, and a second initial value which is the second distance.
The determination step is
The first gap distance between the bearing portion and the rotating shaft body at the first position is calculated by subtracting the first initial value from the first distance.
The second initial value is subtracted from the second distance to calculate the second gap distance between the bearing portion and the rotating shaft body at the second position.
An estimated value of the first gap interval is calculated from the second gap interval, and the estimated value is calculated.
A wear state determination method for determining that wear exceeding the predetermined wear amount has occurred in the bearing portion when both the first gap interval and the estimated value of the first gap interval exceed the predetermined wear amount . In the determination step, when the first gap interval exceeds the predetermined wear amount, but the estimated value of the first gap interval does not exceed the predetermined wear amount, the bearing portion is subjected to the wear exceeding the predetermined wear amount. Is the wear state determination method according to claim 6, wherein it is determined that a different failure has occurred.

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