JP2003042745A - Rotor blade life evaluating device and method and axial blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To predict the life of each rotor blade by measuring the distance between each rotor blade of rotating equipment with the rotor blades such as an axial blower, etc., and a casing, a wall surface, or the like in real time and obtaining the amount of creep of each rotor blade on the basis of the measured value. SOLUTION: In the axial blower with a wheel chamber including a plurality of the rotor blades 2 mounted to an impeller on a rotating shaft, this rotor blade life evaluating device is provided with both a clearance sensor 8 arranged in a casing of the wheel chamber for measuring a clearance between the rotor blades 2 with a metal or magnetic part 7 at the tip of at least one rotor blade 2 and the wheel chamber 5-1; and a control unit 10 for computing the lengths of the rotor blades 2 on the basis of the results of the clearance measurement, the clearance initial value, and the initial lengths of the rotor blades 2, and evaluating the lives of the rotor blades 2 on the basis of changes with time in total distortion computed on the basis of the lengths of the rotor blades 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for evaluating life evaluation of a moving blade.

[0002]

2. Description of the Related Art At present, the blades of an axial blower are made of metal. This is a lightweight fiber reinforced plastic (Fiberglass Reinforced Pl)
It is possible to reduce the weight of the moving blade by making it from ASIC (FRP). As a result, the load is reduced corresponding to the reduction of the centrifugal force of the moving blade, so that the life of the moving blade supporting bearing component and the sliding component can be expected to be extended. At the same time, it can be expected to reduce the material cost and maintenance cost associated with the extension of the service life of those parts. Also, Plasti
Depending on the type of c, there are some that have a strong resistance to corrosion.

The FRP rotor blades creep with operating time. FIG. 18 shows the relationship (creep curve) between the total strain of the FRP blade under constant stress and the operating time. The horizontal axis is the operating time t expressed in logarithm, and the vertical axis is the total strain ε.
Is. Referring to the curve A, the total strain ε at the beginning of the operation
Rises sharply. However, it stabilizes for a while after that. Then, when the fracture is approached, the total strain ε sharply rises again and eventually reaches the fracture (point P1). Therefore, it is necessary to periodically measure the creep amount of the FRP moving blade and take appropriate measures such as repairing or replacing the moving blade before it breaks.

The state of creep also changes depending on the magnitude of the thermal load applied to the FRP blade. If the creep curve of the normal operating temperature is referred to as the curve A with reference to the curves A and B of FIG. 18, when the operating temperature is higher than usual,
The creep curve looks like curve B. That is, the break occurs at the point P2, and the time until the break is shortened.

On the other hand, no trouble occurs in the plant.
As far as possible, it will be operated continuously for nearly two years. But every two years
18 FRP moving blade creep check₀
(Ε ₀, T₀) It is difficult to predict when to reach the point
Is. Also, just to measure the amount of creep,
The wind blower cannot be stopped. In addition, the FRP blade
If you do not know the surface temperature, the creep of temperature
It is difficult to determine if promotion is occurring. Is this the reason
Measure the total strain ε and surface temperature without stopping the blower
Then, estimate the creep amount and evaluate the life of the FRP.
There is a demand for the technique to be performed.

[0006]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a rotor blade life evaluation device capable of measuring in real time the distance between each rotor blade of a rotating machine having rotor blades and a casing or a wall surface. Is to provide.

Another object of the present invention is to measure in real time the distance between each rotor blade of a rotating machine having rotor blades and the casing or wall surface, and to determine the creep amount of each rotor blade based on the measured value. It is to provide a moving blade life evaluation device that can be obtained.

Another object of the present invention is to provide a rotor blade life evaluation device capable of measuring the surface temperature of each rotor blade of a rotating machine having rotor blades in real time.

Still another object of the present invention is to measure the distance between each rotor blade of a rotating machine having rotor blades and the casing or wall surface in real time, and predict the life of each rotor blade based on the measured value. A blade life evaluation device capable of performing

Another object of the present invention is to measure in real time the distance between each rotor blade of a rotating machine having rotor blades and the casing or wall surface and the surface temperature of each rotor blade, and based on those values. It is an object of the present invention to provide a blade life evaluation device capable of predicting the life of each blade.

Another object of the present invention is to measure the distance between each blade and the casing or the wall surface and the surface temperature of each blade in real time, and predict the life of each blade based on these values. It is to provide an axial blower capable of

[0012]

[Means for Solving the Problems] Means for solving the problems will be described below by using the numbers and symbols used in the embodiments of the present invention. These numbers and signs are added to clarify the correspondence between the description of [Claims] and the [Embodiment of the Invention]. However, those numbers and signs should not be used for the interpretation of the technical scope of the invention described in [Claims].

Therefore, in order to solve the above-mentioned problems, the moving blade life evaluation apparatus of the present invention is provided with an impeller (3) on a rotating shaft (4).
In an axial blower having a casing (5) including a plurality of moving blades (2) attached to a casing, the casing is installed in the casing (5), and at least one of the moving blades (2) has a metal tip. Alternatively, a clearance sensor (8, 12) for measuring the clearance between the moving blade (2) having the magnetic body portion (7) and the vehicle compartment (5), the clearance measurement result, the initial value of the clearance, and the motion. A control unit (1) for calculating the length of the moving blade (2) based on the initial length of the blade.
0) and.

Further, in the rotor blade life evaluation apparatus of the present invention, the control unit (10) further determines the rotor blade (2) based on the change with time of the total strain based on the length of the rotor blade (2). Evaluate the life of.

Further, in the rotor blade life evaluation device of the present invention, the clearance sensor (8) is an electromagnetic rotation sensor.

Further, in the blade life evaluation apparatus of the present invention, the clearance sensor (12) is a capacitance type sensor.

Further, the moving blade life evaluating apparatus of the present invention has an axial blower having a casing (5) including a plurality of moving blades (2) mounted on an impeller (3) on a rotating shaft (4). At
A clearance sensor (14, 17) installed in a casing of the vehicle compartment (5) for measuring a clearance between the moving blade (2) and the vehicle compartment (5), the clearance measurement result and an initial value of the clearance. And a control unit (10) for calculating the length of the moving blade (2) based on the initial length of the moving blade.

Further, in the rotor blade life evaluation apparatus of the present invention, the control unit (2) further evaluates the rotor blade life based on the change over time of the total strain based on the length of the rotor blade.

Further, in the rotor blade life evaluation device of the present invention, the clearance sensor (14) is a laser displacement sensor.

Further, in the rotor blade life evaluation device of the present invention, the clearance sensor (15) is a pressure sensor.

Further, the moving blade life evaluation apparatus of the present invention further comprises a moving blade surface temperature measuring unit (26) for measuring the surface temperature of the moving blade (2), and the control unit (10) The life of the moving blade (2) is evaluated based on the time-dependent change in total strain and the measurement result of the moving blade surface temperature.

An axial blower for solving the above problems is
Based on the clearance between the rotor blade (2) and the passenger compartment (5),
A blade life evaluation device capable of evaluating the blade life in real time is provided.

Further, in the axial flow fan of the present invention, the moving blade life evaluation device is the moving blade life evaluation device described in any one of the above.

A moving blade life evaluation method for solving the above-mentioned problems includes a step of measuring a clearance between a casing of a casing (5) and a moving blade (2), a result of the clearance measurement and an initial value of the clearance. The step of calculating the length of the moving blade (2) based on the initial length of the moving blade, and the life of the moving blade (2) based on the change over time of the length of the moving blade (2). And the step of evaluating.

Further, the moving blade life evaluation method of the present invention further comprises the step of measuring the surface temperature of the moving blade (2), and the step of evaluating the life of the moving blade (2) comprises the moving blade. In addition to the change over time in the length of (2), the life of the moving blade is evaluated from the result of measuring the surface temperature of the moving blade.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a rotor blade life evaluation device, an axial flow fan and a rotor blade life evaluation method according to the present invention will be described below with reference to the accompanying drawings. In the present embodiment, a blade life evaluation device used for an axial blower will be described as an example, but the distance between the blade and the casing and the surface temperature of the blade are measured in a device having other rotor blades. The present invention is also applicable to cases such as evaluation of life and control of operation based on the results.

Now, an embodiment of a moving blade life evaluation device according to the present invention will be described with reference to the accompanying drawings. First, referring to FIG. 1, FIG. 1 is a diagram showing a configuration of an embodiment of a moving blade life evaluation device according to the present invention. It is provided with a moving blade 2 of the axial blower, a vehicle interior sensor section 5-1, a conductor section 7, a clearance sensor 8, a sensor mounting cover 11, a cable A9, and a control section 10.

Further, referring to FIG. 2, FIG. 2 is a diagram showing a schematic configuration of an axial flow fan having a moving blade life evaluation device of the present invention. It includes a moving blade 2, an impeller 3, a rotary shaft 4, a casing 5 and a casing sensor section 5-1 belonging to the casing 5, a bearing 6 and a casing 24. Here, FIG. 1 illustrates a portion A of FIG. 2 (a portion including the vehicle interior sensor portion 5-1 surrounded by a broken line). The section B (the end of the impeller casing 24 surrounded by the broken line) will be described later. In addition, in FIG.
The components such as coupling and motor are omitted.

In the present invention, the clearance between the moving blade 2 of the axial blower and its casing 5 is measured from outside the casing. The sensors installed in the vehicle interior sensor unit 5-1 are used to measure in real time. Next, the total strain ε of the moving blade is calculated based on the measured clearance value. Then, finally, the life of the moving blade is calculated from the relationship shown in FIG. The clearance can be constantly measured, and the value of the total strain ε of the moving blade can be accurately grasped based on the value. That is, the creep curve can be obtained without stopping the axial blower, and accurate life evaluation can be performed.

Next, the configuration of each part will be described in detail. With reference to FIG. 2, the moving blade 2 is a moving blade of an axial blower. It is a thin twisted trapezoidal structure. Impeller 3
It is radially attached to the outer peripheral surface (described later) from the central axis of the impeller 3. In the axial blower of this embodiment, there are 10 moving blades 2. Further, it is made of fiber reinforced composite material, and in this embodiment, fiber reinforced plastic (Fibreglas) is used.
s Reinforced Plastic (FRP)
It is made. Further, a conductor portion 7 (described later) is provided at the position of the tip (top or top) of the moving blade 2, which is the position closest to the sensor mounting cover 11 of the vehicle interior sensor portion 5-1.

The impeller 3 is a ring-shaped rotating member that is coaxial with a rotating shaft 4 (described later). A ring portion having a ring-shaped thin plate structure that is perpendicular to the rotation axis 4, a fixed portion that extends perpendicularly to the ring portion (parallel to the rotation axis) on the inner peripheral portion of the ring portion, and a substantially parallel portion to the fixed portion on the outer peripheral portion of the ring portion. And a disk portion extending in the same direction. It is fixed to the rotary shaft 4 at the fixed portion. A predetermined number of moving blades 2 are fixed to the disk portion. The rotating blade 4 is rotated by the rotation of the rotating shaft 4. Further, the pitch angle of this moving blade may change depending on the gas flow rate.

The rotary shaft 4 is a shaft for holding the impeller 3 which is rotationally driven by a motor (not shown). The impeller 3 is fixed, and bearings 6 (described later) support both sides slightly separated from the impeller 3. The motor is located on one outer side of the bearing 6 (on the side away from the impeller 3). The rotation of the motor is transmitted to the impeller 3.

The bearing 6 is a bearing for the rotary shaft 4, which is installed at substantially equal distances with the impeller 3 fixed to the rotary shaft 4 interposed therebetween. The rotating shaft 4 is held so as to receive a radial load and an axial load and prevent the shaft from moving and allow smooth rotation.

The casing 5 is installed so as to surround the entire region including the moving blades 2 and the impeller 3 of the axial blower. And the flow path of the gas 1 is formed and the blowing is guided. The gas 1 flows from the upper right portion of the passenger compartment 5 in FIG. 2 as indicated by the arrow, and reaches the axial blower. Then, the moving blade 2 sends the moving blade 2 from the right side to the left side. After that, gas 1
It is sent to the upper left part of the passenger compartment 5.

The impeller casing 24 is a casing provided so as to cover the rotating shaft 4 and the impeller 3. The rotating shaft 4 and the impeller 3 should not be exposed to the gas 1. At the same time, a flow path is formed so that the gas 1 flows smoothly.

The rotation shaft 4 is rotated by the rotation of the motor. Then, the rotation causes the impeller 3 to rotate, thereby rotating the moving blade 2. Due to the rotation of the rotor blade 2, the gas 1 is sucked from the right side direction of the rotor blade 2 in FIG. 2 toward the rotating shaft 4 and is sent out to the left side direction of the rotor blade 2. By the movement of this axial blower,
The gas 1 forms a unidirectional flow.

Next, referring to FIG. 1, the passenger compartment sensor section 5-
Reference numeral 1 denotes a clearance sensor 8 of a moving blade life evaluation device according to the present invention in a vehicle compartment 5 that forms a vehicle compartment that guides air blowing.
It is a wall surface of a vehicle compartment in the vicinity where (described later) is attached. A hole for mounting the clearance sensor 8 is opened.

The sensor mounting cover 11 is a cover welded so as to close the hole formed in the passenger compartment sensor 5-1. A clearance sensor is attached to the center of the clearance sensor.

The conductor portion 7 exists near the center of the tip of the moving blade 2, which is the position closest to the sensor mounting cover 11 of the passenger compartment sensor portion 5-1. The shape is not limited, but is a size that can be detected by a clearance sensor 8 described later. In this embodiment, it has a rectangular parallelepiped metal (magnetic material) plate and its peripheral members. The clearance sensor 8 (which will be described later) interacts with the conductor portion 7 so that the rotor blade 2 (the tip portion thereof)
The clearance between the vehicle compartment sensor unit 5-1 and (the wall surface thereof) is measured. If the moving blade is made of metal, the moving body portion 7 is not necessary.

The conductor portion 7 will be described in detail with reference to FIGS. 4 and 5. FIG. 4A is a front view of the moving blade 2 with the moving blade 2 removed from the impeller 3. It has a mounting flange at the bottom and a conductor portion 7 at the top. The mounting flange is a flange for fixing the moving blade 2 to the impeller 3 at the bottom of the moving blade 2. The moving blade 2 is fixed by a bolt with a mounting flange. In addition, the conductor portion 7 has a top portion (tip of the moving blade 2: C surrounded by a broken line) opposite to the bottom mounting flange.
Department).

FIG. 4B is an enlarged sectional view of the moving blade 2 and the conductor portion 7 in the vicinity of the conductor portion 7 of the portion C of FIG. 4A. The conductor portion 7 has a metal body 7-2, a bolt 7-1 and an adhesive resin 7-3. The conductor portion 7 is installed inside a groove having the same area of the rotor blade 2 and a depth slightly larger than the thickness of the conductor portion 7.

The metal body 7-2 is a rectangular parallelepiped magnetic body. In this embodiment, it is an iron piece. And the bolt 7-1
Two holes for passing through are opened. Bolt 7-1
Two bolts for attaching the metal body 7-2 to the moving blade 2. The adhesive resin 7-3 is a resin that embeds the metal body 7-2 fixed to the rotor blade 2 with the bolt 7-1 and integrates it with the rotor blade 2. The metal body 7-2 has the bolt 7 in the groove.
It is fixed by -1, and the upper and lower sides thereof are filled with the adhesive resin 7-3 without any gap. Then, the top side of the moving blade 2 of the conductor portion 7 is integrated with the curve of the top of the moving blade 2 and is finished smoothly so as not to generate extra resistance to the air flow. Here, as the bolt 7-1, a non-magnetic shrub screw represented by austenitic stainless steel is used. Bolt 7-1
Since it is a non-magnetic material, the clearance sensor 8 can accurately measure the clearance with the conductor portion 7 without sensing the bolt top.

FIGS. 5 (a) and 5 (b) are a plan view and a magnified view of a portion C in a state in which the moving blade 2 is removed from the impeller 3. The description of each part is the same as in FIG. Conductor part 7
Is installed near the center of the top (tip) of the moving blade 2. Then, the side surface side of the moving blade 2 of the conductor portion 7 is integrated with the curved surface of the side surface of the moving blade 2, and is finished smoothly so as not to generate extra resistance to the air flow.

Subsequently, referring to FIG. 1, the clearance sensor 8 is mounted on the sensor mounting cover 11 with the sensor facing the moving blade 2. The clearance between the moving blade 2 and the passenger compartment sensor section 5-1 is measured. In this embodiment, an electromagnetic rotation sensor (described later) is used.

The electromagnetic rotation sensor which is the clearance sensor 8 will be described in detail with reference to FIG. The clearance sensor 8 includes a yoke 8-1 and a sensor casing 8
-2, signal line extraction part 8-3, permanent magnet 8-4, detection line 8
-5 and a detection coil 8-6.

The sensor casing 8-2 is a casing in which each part of the clearance sensor 8 is housed. An end of a yoke 8-1 (described later) projects from one end. A signal line extraction portion 8-3 projects from the other end portion. The signal line outlet 8-3 (described later) is connected to the cable A9.
(See below).

The permanent magnet 8-4 is connected to the sensor casing 8-
2 and has one end connected to a yoke 8-1 (described later). It is a cylindrical permanent magnet that emits magnetic flux for magnetically affecting the conductor portion 7. The magnetic field is the yoke 8
It goes out from the tip of -1 toward the moving blade 2.

The yoke 8-1 is a sensor casing 8-2.
Inside, it is a magnetic piece on a cylinder or a rod of metal. One end thereof is joined to the permanent magnet 8-4, and the detection coil 8-2 is wound around the middle portion thereof. The other end projects slightly from one end of the sensor casing 8-2 (described later). Magnetic flux from the permanent magnet 8-4 is emitted from the tip of the yoke 8-1.

The detection coil 8-6 is a sensor casing 8
-2, the coil is wound around the yoke 8-1 passing through the central axis. The magnetic flux passes through the inside of the detection coil 8-6 via the yoke 8-1. When the conductor portion 7 which is a magnetic body approaches there, the magnetic flux thereof changes. The rotation is detected by detecting the change.

The detection line 8-5 is connected to the sensor casing 8-2.
Inside, the one end is connected to the detection coil 8-6, and the other end is connected to the signal extraction part 8-3. The induced electromotive force generated in the detection coil (described later) is taken out and sent to the signal taking-out section 8-3.

The signal extracting section 8-3 bundles a plurality of wires into one and sends it to the cable A9.

Here, the measurement principle will be described. When the conductor portion 7 which is a magnetic body approaches the vicinity of the yoke 8-1 of the clearance sensor 8, the magnetic flux passing through the detection coil 8-6 changes. Along with this, an induced electromotive force having a frequency proportional to the amount of change in magnetic flux is generated in the detection coil 8-6. Magnetic flux is
Pulsation of f = number of rotations (rpm) × number of blades / 60 (Hz) Therefore, it is output as the rotation signal of the clearance sensor 8. Since the magnitude of the induced electromotive force in the detection coil 8-6 changes depending on the distance, the detection coil 8-6
The induced electromotive force generated inside also changes with distance. Therefore, the distance between the yoke 8-1 and the conductor portion 7, that is, the clearance between the moving blade 2 and the passenger compartment sensor portion 5-1 can be measured by the magnitude of the induced electromotive force.

Further, it is also possible to measure by the principle of the following inductive displacement meter. That is, when the conductor portion 7 passes through the magnetic flux from the yoke 8-1 of the clearance sensor 8, an eddy current is generated on the conductor portion 7. This eddy current changes depending on the distance between the yoke 8-1 and the conductor portion 7. The magnetic field lines generated by the eddy current cause the detection coil 8-
6 (yoke 8-1) changes the lines of magnetic force, and the detection coil 8
Induced electromotive force is generated during -6. Since the magnitude of the eddy current changes with the distance, the induced electromotive force generated in the detection coil 8-6 also changes with the distance. Therefore, depending on the magnitude of the induced electromotive force, the distance between the yoke 8-1 and the conductor portion 7,
That is, the clearance between the moving blade 2 and the vehicle interior sensor unit 5-1 can be measured.

A high-frequency current is made to flow in the detection coil 8-6, and a current change due to an induced current generated in the detection coil 8-6 due to the interaction between the high-frequency magnetic field generated by the detection coil 8-6 and the conductor portion 7. It is also possible to use a method of detecting

Subsequently, referring to FIG. 1, the cable A9 is
It is a cable connected to the clearance sensor 8 and the control unit 10. The control unit 10 outputs a clearance signal, which is a signal related to the clearance detected by the clearance sensor 8.
Communicate to. It is an assembly of a plurality of cables.

The controller 10 receives the clearance signal from the cable A9 and amplifies it as necessary. Then, the clearance (here, g _n ) is calculated based on the signal and the calibration curve (FIG. 9: relationship between clearance signal and actual clearance, held in storage unit not shown).

Next, the current length of each moving blade 2 (here, L _n ) is calculated from the clearance g _n . That is, the length of the initial blades 2 (the _{L 0)} as the initial clearance (and _{g 0)} sum of _{(L 0} + _g 0),
Subtracting the clearance g _n measured immediately before gives the current length L _n of the moving blade 2. L _n = (L ₀ + g ₀ ) −g _n . The initial length L ₀ of the moving blade 2 and the initial clearance g ₀ are held in a storage unit (not shown).

Then, from the current length L _n of the moving blade 2 and the initial length L ₀ of the moving blade 2, the total strain ε of the moving blade 2 is ε =
To calculate the _{(L n -L 0) / L} 0. Then, the creep condition and the life of each rotor blade 2 are determined from the relationship between the total strain ε at each time point up to the present time and the running time up to the present time (change of total strain of the rotor blade 2 with time, see FIG. 18). To do. The correspondence between the clearance signal and each rotor blade 2 is determined by the rotation sensor 21.
This is performed by receiving a rotation detection signal from a rotation detection unit 22 (described later) based on an output from (described later) from a cable B23 (described later).

At that time, referring to the information of the surface temperature of the moving blade 2 measured by the moving blade surface temperature measuring unit 26 described later,
It is also possible to judge the state of creep and the life of each rotor blade 2.

Next, with reference to FIGS. 6 and 7, a method of associating the relationship between the clearance signal which is the signal detected by the clearance sensor 8 and each moving blade 2 will be described.

FIG. 6 is a diagram showing a configuration in which the relationship between the clearance signal detected by the clearance sensor 8 and each moving blade 2 is associated with each other. It includes a moving blade 2, a conductor portion 7, a clearance sensor 8, a cable A9, a rotating shaft 4, a reflecting portion 20, a rotation sensor 21, a cable B23, and a control portion 10. The control unit 10 also includes a rotation detection unit 22, a peak hold unit 18, a waveform output unit 19, and an evaluation analysis unit 13.

Since the moving blade 2, the conductor portion 7, the clearance sensor 8 and the cable A9 are as described above, the description thereof will be omitted.

The reflector 20 is attached to a part of the outer peripheral surface of the rotary shaft 4 and is like a reflector or a reflector for reflecting the light emitted from the rotary sensor 21 (described later) toward the rotary sensor 21. Is. Only one is installed on the rotary shaft 4 corresponding to the position of one of the plurality of moving blades 2 on the impeller 3 attached to the rotary shaft 4. The installation position in the longitudinal direction on the rotary shaft 4 is arbitrary as long as it does not cause a measurement problem.

The rotation sensor 21 is slightly separated from the rotation shaft 4 so as to emit light perpendicularly to the outer peripheral surface of the rotation shaft 4.
Moreover, it is fixed so as not to rotate. 1 of rotation axis 4
It is a position where the rotation sensor 21 and the reflecting portion 20 face each other once per circumference. The light emitting portion (L
The rotary shaft 4 is irradiated with light from an ED or laser emission). Then, the reflected light from the rotating shaft 4 is converted into an electric signal and output. The reflected light is emitted very strongly only when the rotation of the rotating shaft 4 causes the reflecting portion 20 to reach the position facing the rotation sensor 21.

The cable B23 is a cable for connecting the rotation sensor 21 and the control unit 10. The output of the signal of the rotation sensor 21 is transmitted to the control unit 10.

The rotation detection unit 22 is provided in the control unit 10, and based on the intensity of the signal based on the reflected light from the rotation sensor 21, when the signal intensity exceeds a preset value, the rotation axis 4 (or It is determined that the impeller 3) has rotated once, and a rotation detection signal which is a pulse signal is output. Thereby, the phase of rotation can be determined.

The peak hold 18 is in the control unit 10 and is a signal (voltage) output from the clearance sensor 8.
A peak hold signal, which is the peak hold value of the voltage waveform, is output according to. Then, the value is maintained until the next input. Since the signal (voltage) output from the clearance sensor 8 is based on the clearance, the peak hold value is constant if all the blades 2 have the same clearance.

The waveform output section 19 is provided in the control section 10, receives the signals output from the rotation detection section 22, the clearance sensor section 8 and the peak hold section 18, amplifies them as necessary, and sends them to the evaluation analysis section 13. Send.

The evaluation analysis unit 13 receives the clearance signal, the peak hold signal, and the rotation detection signal from the waveform output unit 19. Then, the correspondence between the clearance signal and each moving blade 2 is determined from the rotation detection signal. Further, the clearance g, the length of the moving blade 2 and the total strain ε are obtained from the clearance signal, and each moving blade 2 is calculated based on the change with time of the total strain ε.
Determine the creep status and life of the. Then, the difference in creep of each rotor blade 2 is detected from the peak hold signal.

Referring to FIG. 7, (a) is a rotation detection signal,
(B) is a clearance signal, (c) is a peak hold signal. 7 (a) to 7 are indicated by dotted lines in the figure.
The correspondence of the time between (c) is shown.

In FIG. 7A, one pulse of the rotation detection signal indicates that the light from the rotation sensor 21 is reflected by the reflecting section 20. That is, the rotating shaft 4 makes one rotation between one pulse and the next pulse. Then, the rotation cycle (or rotation speed) can be confirmed by the pulse generation interval.

Next, in FIG. 7B, one pulse of the clearance signal indicates that the conductor portion 7 of the moving blade 2 has passed near the clearance sensor 8. That is, while the rotating shaft 4 makes one rotation, pulses are generated by the number of the moving blades 2. By checking the interval between the pulses, the tip of each rotor blade 2 (around where the conductor 7 is installed)
The interval between can be monitored. Further, by examining the pulse amplitude (Vx in the figure), the size of the clearance in each rotor blade 2 can be known.

Subsequently, in FIG. 7 (c), the signal of the peak hold signal shows the magnitude of one pulse of the clearance signal of FIG. 7 (b), and its position is maintained until the next pulse is input. . The change in the clearance for each rotor blade 2, that is, the difference in the clearance between the rotor blades 2 is shown.

Next, calibration for making the magnitude of the clearance signal from the clearance sensor 8 correspond to the actual clearance will be described. The clearance signal is a voltage signal that requires calibration to convert it to distance (length).

Referring to FIG. 8, a detailed structure of the clearance sensor 8 and its surroundings is shown. FIG. 8A is a side view (however, the clearance sensor 8 and the sensor mounting cover 1
1 and a passenger compartment sensor 5-1 show cross sections), and FIG. 8B is a front view.

The moving blade 2, the passenger compartment sensor portion 5-1, the clearance sensor 8, the sensor mounting cover 11, the spacer A27,
Pointer 28, spacer B29, double nut A30, double nut B31, screw A32, screw B33, and scale plate 3
It consists of 4.

Since the moving blade 2, the vehicle interior sensor portion 5-1, the clearance sensor 8 and the sensor mounting cover 11 are as described above, their explanations are omitted.

The spacer A27 and the spacer B29 are jigs for fixing the pointer 28 (described later) on the clearance sensor 8. The pointer 28 is fixed to the clearance sensor 8 and moves in the same manner as the clearance sensor 8. Double nut A30 and double nut B
Reference numeral 31 is a nut for moving the clearance sensor 8 up and down. The screw A 32 and the screw B 33 are screws for attaching a scale plate 34 (described later) to the sensor attachment cover 11. The scale plate 34 is a plate that displays a scale for indicating the position of the clearance sensor 8 with the pointer 28.

The clearance sensor 8 is a double nut A.
It can be moved up and down by moving 30 and the double nut B31. The position at that time is the pointer 2 on the scale plate 34.
It can be grasped at the position indicated by 8. Further, since the clearance sensor 8 is installed outside the vehicle interior 5, the moving blade 2
It is possible to change the position of the clearance sensor 8 without stopping the rotation of the.

In order to obtain the clearance from the signal of the clearance sensor 8, calibration is performed beforehand so that the magnitude of the clearance signal corresponds to the actual clearance. Therefore, the distance (clearance) between the tip of the yoke 8-1 of the clearance sensor 8 and the top of the moving blade 2 (conductor portion 7) is measured in the initial state during the test operation, and the voltage amplitude of the clearance signal is obtained from the measurement. . Then, by changing the position of the clearance sensor 8 without stopping the operation,
The relationship between the clearance and the voltage amplitude is measured to obtain a calibration curve as shown in FIG. This operation made it possible to convert the voltage amplitude (output voltage) of the clearance sensor during actual operation into the size of the clearance.

Next, the structure for measuring the surface temperature of the moving blade 2 will be described. FIG. 17 is a diagram showing a blade surface temperature measuring unit and its peripheral portion. The moving blade 2, the impeller 3, the impeller casing 24, the cable C25, and the moving blade surface temperature measuring unit 26. FIG. 17 is an enlarged view of part B in FIG. Since the rotor blade 2, the impeller 3, and the impeller casing 24 are as described above, the description thereof will be omitted.

The cable C25 is used for the rotor blade surface temperature measuring unit 2
6 and the control unit 10. It is a cable for transmitting the signal of the rotor blade surface temperature measuring unit 26 to the control unit 10.

The moving blade surface temperature measuring unit 26 measures the surface temperature of the moving blade 2 and outputs the temperature signal to the control unit 10.
The control unit also uses the surface temperature information to determine the creep condition of the moving blade 2 and determine the life.

The gas 1 is the exhaust gas from another facility having a temperature of about 120 ° C.

Next, the operation of the embodiment of the rotor blade life evaluation device according to the present invention will be described with reference to the accompanying drawings.

Referring to FIG. 2, in the axial flow fan, the rotating shaft 4 is rotated by the rotation of a motor (not shown). The rotation causes the impeller 3 to rotate, and the moving blades 2 on the impeller 3 rotate about the rotation axis 4. Due to the rotation of the rotor blades 2, the gas 1 is sucked from the upper right inside the vehicle compartment 5 in the figure, and the gas 1 travels along the rotary shaft 4 in the axial blower. Then, the gas 1 is sent from the right side to the left side of the moving blade 2 in the figure by the rotation of the moving blade 2, and finally sent out from the vehicle interior 5 to the outside.

Next, the measurement of the clearance g when the rotor blade is rotated twice will be described. First, referring to FIGS. 8 and 9, prior to the operation of the axial blower, the clearance signal from the clearance sensor 8 is calibrated using the device having the configuration of FIG. Then, the relationship between the clearance signal and the clearance g as shown in FIG. 9 is obtained. That is, at the time of test operation of the axial blower, the rotation speed v of the blade 2 is fixed, and the distance (clearance g) between the tip of the yoke 8-1 of the clearance sensor 8 and the top portion (conductor portion 7) of the moving blade 2 is measured. Then
The voltage V of the clearance signal is obtained from the measurement. this,
The clearance g is changed, and the calibration curve as shown in FIG. Then, a calibration curve as shown in FIG. 9 is obtained at various rotation speeds v of the moving blades 2. Those data are stored in a database (not shown) in the control unit 10.

Next, the clearance g is measured by the rotor blade life evaluation device shown in FIGS. 1, 3 and 6 while the rotor 2 is rotating during operation of the axial blower. 1 per rotation of the rotating shaft 4 (and the impeller 3 and the rotor blade 2) as the rotating shaft 4 rotates.
The reflector 20 comes to a position facing the rotation sensor 21. The rotation sensor 21 always receives the reflected light of the light emitted toward the rotation axis 4 itself. Then, a signal (voltage) corresponding to the intensity of the received light is output. Reflector 2
When 0 comes to the position facing the rotation sensor 21, the reflected light becomes very strong, so the voltage output from the rotation sensor 21 becomes larger than before and after that.

At the time when the voltage becomes extremely large, the rotation detecting section 22 judges that the reflecting section 20 has come to the position facing the rotation sensor 21 from the magnitude of the voltage = the rotation shaft 4 has made one rotation. . Then, the pulse of the rotation detection signal (see FIG.
(A)) is generated. The signal is sent to the evaluation analysis unit 13 via the waveform detection unit 19. The rotating shaft 4 makes one rotation between one pulse and the next pulse of the rotation detection signal. Then, the rotation cycle (or rotation speed) can be confirmed by the pulse generation interval.

On the other hand, the clearance sensor 8 emits a clearance signal shown in FIG. 7 (b) as the conductor 7 accompanying the rotation of the moving blade 2 passes near the clearance sensor 8. One pulse of the clearance signal indicates that the conductor portion 7 of one moving blade 2 has passed. That is, while the rotating shaft 4 makes one rotation, pulses are generated by the number of the moving blades 2. The signal is sent to the peak hold unit 18 and the waveform detection unit 19, and further to the evaluation analysis unit 13 via the waveform detection unit 19.

In this embodiment, ten moving blades 2 are used. No. shown in FIG. 1-No. 10 is
This is a clearance signal corresponding to each of the 10 blades 2.
Each signal is emitted at times t _{1 to} t ₁₀ .
In correspondence with the above-mentioned rotation detection signal, which N
o. It is possible to grasp whether or not the signal is from the moving blade 2.

By checking the interval between the pulses, the top of each rotor blade 2 (in the vicinity where the conductor 7 is installed)
The interval between can be monitored. That is, the distortion in the rotating direction of the moving blade 2 can be grasped. Further, by examining the pulse amplitude (Vx in the figure), the size of the clearance in each rotor blade 2 can be known. Then, the creep curve as shown in FIG. 18 can be obtained by following the change with time of the clearance based on the clearance signal of each moving blade 2.

The clearance signal sent from the clearance sensor 8 to the peak hold unit 18 is converted into a peak hold signal. In FIG. 7C, the peak hold signal indicates the magnitude of one pulse (Vx in FIG. 7B) of the clearance signal in FIG. 7B, and the magnitude until the next pulse is input. Keep it. The peak hold signal is sent to the evaluation analysis unit 13 via the waveform detection unit 19.

The peak hold signal indicates a change in clearance with respect to each moving blade 2, that is, a difference in clearance between each moving blade 2. Further, if there is an eccentricity in the rotary shaft 4 or the impeller 3 from this curve, it is possible to grasp it.

The control unit 10 (the evaluation analysis unit 13 thereof) receives the clearance signal from the cable A9 and amplifies it as necessary. Further, the rotation detection signal from the rotation detection unit 22 based on the output from the rotation sensor 21 is received from the cable B23. Then, the rotation detection signal from the rotation detection unit 22 determines which moving blade 2 each clearance signal is data of. At the same time, the clearance g _n is calculated for each moving blade 2 based on the clearance signal and the calibration information (relationship between the clearance signal measured in advance during the test operation and the actual clearance) stored in the storage unit (not shown).

Next, the current length L _n of each moving blade 2 is calculated from the clearance g _n . That is, the initial rotor blade 2
Of the length L ₀ and the initial clearance g ₀ (L ₀ +
Subtracting the clearance g _n measured immediately before from g ₀ ) gives the current length L _n of the moving blade 2. L _n = (L ₀ + g
₀ ) -g _n . The initial length L ₀ of the moving blade 2 and the initial clearance g ₀ are held in a storage unit (not shown). Similarly, the newly calculated clearances g _n and L _n are also stored in the storage unit (not shown).

The clearance g_nFrom each current blade
2 length L_nThe following method can be used to calculate
is there. That is, a clear run of past measurements that is not the initial
G _mAnd the length L of the rotor blade 2 at that time_mUsing L_n=
(L_m+ G_m) -G_n  It is also possible to ask.

Next, from the current length L _n of the moving blade 2 and the initial length L ₀ of the moving blade 2, the total strain ε = (L
Calculate _n −L ₀ ) / L ₀ . Then, from the relationship between the total strain ε at each time point up to the present time and the operating time up to the present time (change in total strain of the moving blade 2 with time, see FIG. 18), the creep condition of each moving blade 2 is determined. The curve can be calculated. And determine the life.

For the calculation of the creep curve, the fitting curve formula of the creep curve is determined in advance, and the parameters of the fitting curve are calculated by the least squares method based on the total strain ε and the operating time which have been measured and calculated so far. Obtain by making a decision. Then, P ₀ shown in FIG.
The point is judged (predicted) and the life is reached. The determination of P ₀ can also be performed by changing the curvature of the curve (which sharply rises in the final stage).

With the above operation, the creep state (relationship between total strain ε and operating time) of each rotor blade 2 can be always grasped in real time without stopping the axial blower. Then, it is possible to accurately grasp the life of each moving blade 2 without stopping the axial blower.

On the other hand, the surface temperature of each moving blade 2 can be used to grasp the state of creep. The output of the rotor blade surface temperature measurement unit 26 is sent to the control unit 10, and the surface temperature of each rotor blade 2 is recorded from the relationship with the rotation detection signal described above. Then, each blade 2 has a preset temperature (for example, 200
If it exceeds (° C), the life is judged to be shorter than the life in the normal case (life when the surface temperature is not taken into consideration).

For example, the time in which the temperature exceeds a preset temperature is accumulated, and the life is varied by 5% and 10% based on the accumulated time. The relationship between the cumulative time and the rate of shortening the life is determined in advance and stored in a storage unit (not shown).

By adding the operation of always grasping the surface temperature of the moving blade 2 in real time, the creep state of each moving blade 2 can be always grasped more accurately in real time without stopping the axial blower. Then, the life of each blade 2 can be more accurately grasped without stopping the axial blower.

10 to 12 show the test results using the model rotor blade. FIG. 10 shows the relationship between the peripheral speed V _f and the output voltage V. The vertical axis represents the output voltage V (Peak to Peak Voltage V) of the clearance signal.
^P-P ; Vx in FIG. 7B). The horizontal axis is the peripheral speed V
_f (rotational peripheral velocity at the top of the rotor blade 2 (conductor portion 7)). In theoretical calculation, the output voltage V of the clearance signal is
It is proportional to the peripheral speed V _f . In FIG. 10, the output voltage V tends to drop slightly in the high peripheral speed range, but the output voltage V is certainly
It is approximately proportional to the peripheral speed V _f .

Further, FIG. 11 shows the relationship between the clearance g and the output voltage V of the clearance signal (normalized by the peripheral speed V _f ). The vertical axis represents output voltage V / peripheral speed V _f , and the horizontal axis represents clearance g. In theoretical calculation, the output voltage V
/ The peripheral speed V _f is inversely proportional to the square of the clearance g. In FIG. 11, it can be seen that the measurement point is clearly on the curve inversely proportional to the square of the clearance g shown by the broken line in the figure.

FIG. 12 shows the relation between the clearance signal output voltage V and the clearance g when the peripheral speed V _{f is} constant. The vertical axis is the clearance g, and the horizontal axis is the output voltage V
Is. Also in this case, in theoretical calculation, the output voltage V is inversely proportional to the square of the clearance g. In FIG. 12, it can be seen that it is inversely proportional to the square of the clearance g shown by the broken line in the figure.

According to the present invention, in an axial blower having a casing having moving blades attached to an impeller on a rotating shaft,
It becomes possible to measure the distance (clearance) between the moving blade and the casing or the wall surface in real time using a clearance sensor. Depending on the type of clearance sensor, a metal piece is installed or magnetic powder or metal powder is applied to the tip of the rotor blade. It may not be necessary depending on the type of clearance sensor.

Further, according to the present invention, the elongation and the total strain of the moving blade are calculated based on the clearance obtained by the above method.
It is possible to obtain in real time. Then, the creep amount of each moving blade can be obtained based on the value. Also, the displacement between the moving blades (the displacement of the tip in the circumferential direction)
It is also possible to grasp.

Furthermore, the surface temperature of each moving blade can be measured in real time. Then, based on the result, it is possible to obtain information (deterioration of creep, etc.) regarding deterioration of the moving blade.

It is possible to predict the life of each moving blade based on the creep amount. Furthermore, it is possible to incorporate the surface temperature into the prediction and perform life evaluation.

In this embodiment, the conductor portion 7 is provided on the top of the moving blade 2. This is done by cutting a part of the moving blade 2, embedding the metal body 7-2, fixing it with mounting bolts,
The shape is fixed by -3. However, moving blade 2
It is also possible to substitute by simply applying a magnetic material to the top of the.

FIG. 13 is a diagram showing another configuration of the embodiment of the moving blade life evaluation apparatus according to the present invention. FIG. 13 (a)
And FIG. 13B is a front view and a plan view of the state where the moving blade 2 is removed from the impeller 3. A conductor portion 7'coated with a magnetic material is formed on the top of the rotor blade 2. If necessary, a protective film such as ceramics is applied. in this way,
Even if only the magnetic material is applied, the same effect as when the metal body 7-2 is embedded can be obtained. It has the advantage of being easy to install. On the other hand, since it is only applied, it is desirable to use it for a short period of time and it is desirable that the substance is not affected by the gas 1.

In this embodiment, the clearance sensor 8
As the electromagnetic rotation sensor (8-1 to 8-6) was used. However, it is also possible to use other sensors capable of measuring the clearance g.

FIG. 14 is a diagram showing another configuration of the embodiment of the moving blade life evaluation apparatus of the present invention. It is provided with a moving blade 2 of an axial blower, a vehicle interior sensor section 5-1, a conductor section 7, a clearance sensor 12, a sensor mounting cover 11, a cable A9, and a control section 10. In this case, providing the conductor portion 7 on the moving blade 2 is the same. However, this is different from the above example in that the clearance sensor 12, that is, the capacitance sensor is used as another sensor capable of measuring the clearance g.

The measurement is performed according to the following measurement principle. A capacitor is formed by arranging two electrodes so as to face each other.
The capacitance is proportional to the area of the electrodes and the dielectric constant between the electrodes and inversely proportional to the distance. If the conductor portion 7 is used as one electrode and the conductor in the clearance sensor 12 is used as the other electrode, the distance can be obtained by measuring the change in the capacitance of the capacitor. By measuring the relationship between the capacitor capacity and the clearance g in advance and performing calibration, the clearance g can be measured by measuring the capacitor capacity.

In the case of the clearance sensor 12, that is, the capacitance type sensor, it is possible to deal with it by applying a metal material to the top of the moving blade 2, as in the example shown in FIG.

FIG. 15 is a diagram showing still another configuration of the embodiment of the moving blade life evaluation device of the present invention with reference to FIG. The moving blade 2 of the axial blower, the vehicle interior sensor unit 5-1, the clearance sensor 14, the heat resistant glass 15, the sensor mounting cover 16, the cable A9, and the control unit 10 are provided. In this case, the blade 2 is not specially processed, and the clearance sensor 14, that is, the laser displacement sensor is used as another sensor capable of measuring the clearance g, which is different from the above example. Along with this, the heat-resistant glass 15 is attached to the sensor attachment cover 16 so that laser light can enter and exit.

The measurement principle is to measure the time required for the output pulse of the laser beam to be reflected back to the top of the moving blade 2 and to return the distance. Alternatively, the light intensity of the reflected light is measured and the light is attenuated in proportion to the square of the optical path length. By previously measuring the relationship between the pulse return time or the light intensity and the clearance g and performing calibration, the clearance g can be measured by these measurements. On the same principle,
Ultrasound can also be used.

FIG. 16 is a diagram showing still another configuration of the embodiment of the moving blade life evaluation device of the present invention with reference to FIG. It is provided with a moving blade 2 of the axial blower, a vehicle interior sensor section 5-1, a clearance sensor 17, a sensor mounting cover 11, a cable A9, and a control section 10. Also in this case, the moving blade 2
This is different from the above-mentioned example in that the clearance sensor 17, that is, the pressure sensor is used as another sensor capable of measuring the clearance g without performing any special processing.

The measurement principle utilizes the phenomenon that the pressure in the vicinity of the clearance sensor 17 becomes high at the moment when the moving blade 2 approaches the clearance sensor 17 and passes in front of the clearance sensor 8. By measuring the relationship between the pressure and the clearance g in advance and performing calibration, the clearance g can be measured by measuring the pressure.

[0121]

According to the present invention, the distance between each moving blade of a rotating device having a moving blade such as an axial blower and the casing or the wall surface is measured in real time, and the creep of each moving blade is measured based on the measured value. It is possible to obtain the quantity and predict the life of each blade.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a moving blade life evaluation device according to the present invention.

FIG. 2 is a diagram showing a schematic configuration of an axial flow blower having a moving blade life evaluation device according to the present invention.

FIG. 3 is a diagram showing details of the clearance sensor 8 of the configuration of the embodiment of the rotor blade life evaluation device according to the present invention.

FIG. 4 (a) is a front view of the moving blade removed from the impeller 3. (B) It is sectional drawing of the moving blade and the conductor part which expanded the C section of Fig.4 (a).

FIG. 5 (a) is a plan view showing a state where the moving blade is removed from the impeller. (B) It is a plane of the moving blade and the conductor part which expanded C section of Fig.5 (a).

FIG. 6 is a diagram showing a configuration in which a relationship between a signal detected by a clearance sensor and each moving blade in the embodiment of the moving blade life evaluation apparatus according to the present invention is associated with each other.

FIG. 7A is a diagram showing a change with time of a rotation detection signal. (B) It is a figure which shows the time change of a clearance signal. (C) It is a figure which shows the time change of a peak hold signal.

FIG. 8 (a) is a side view showing a detailed configuration of the clearance sensor and its surroundings in the configuration of the embodiment of the moving blade life evaluation apparatus of the present invention. (B) It is a front view which shows the detailed structure of the clearance sensor of the structure of embodiment of the moving-blade life evaluation apparatus which is this invention, and its periphery.

FIG. 9 is a diagram showing a calibration curve of a clearance signal and a clearance g.

FIG. 10 is a diagram showing a relationship between a peripheral speed V _f and an output voltage V.

FIG. 11 is a diagram showing a relationship between a clearance g and an output voltage V of a clearance signal (normalized with a peripheral speed V _f ).

FIG. 12 is a diagram showing a relationship between an output voltage V of a clearance signal and a clearance g (constant peripheral speed V _f ).

FIG. 13 (a) is a front view of a rotor blade showing another configuration of the embodiment of the rotor blade life evaluation device of the present invention. (B) A plan view of a moving blade showing another configuration of the embodiment of the moving blade life evaluation device of the present invention.

FIG. 14 is a diagram showing another configuration of the embodiment of the rotor blade life evaluation device of the present invention.

FIG. 15 is a diagram showing still another configuration of the embodiment of the rotor blade life evaluation device according to the present invention.

FIG. 16 is a diagram showing still another configuration of the embodiment of the rotor blade life evaluation device according to the present invention.

FIG. 17 is a diagram showing a configuration of a rotor blade surface temperature measurement unit and its peripheral portion in an embodiment of the rotor blade life evaluation device according to the present invention.

FIG. 18 shows the relationship (creep curve) between total strain and operating time of a FRP blade under constant stress.

[Explanation of symbols]

1 gas 2 moving blades 3 wheels 4 rotation axes 5 passenger compartment 5-1 Vehicle compartment sensor 6 bearings 7 conductor 7-1 Mounting bolt 7-2 Metal body 7-3 Adhesive resin 7'conductor part 8 Clearance sensor 8-1 York 8-2 Sensor casing 8-3 Signal line extraction part 8-4 Permanent magnet 8-5 Detection line 8-6 Detection coil 9 Cable A 10 Control unit 11 Sensor mounting cover 12 Clearance sensor 13 Evaluation and analysis section 14 Clearance sensor 15 Heat-resistant glass 16 Sensor mounting cover 17 Clearance sensor 18 Peak hold part 19 Waveform output section 20 Reflector 21 Rotation sensor 22 Rotation detector 23 Cable B 24 impeller casing 25 cable C 26 Rotor blade surface temperature measurement unit 27 Spacer A 28 guidelines 29 Spacer B 30 Double nut A 31 Double Nut B 32 screw A 33 screw B 34 scale plate

Continued front page    (72) Inventor Nozomi Kawabushi             3-5-1, 717-1, Fukahori-cho, Nagasaki-shi, Nagasaki             Hishi Heavy Industries Ltd. Nagasaki Research Center (72) Inventor Katahiko Katahiko             3-5-1, 717-1, Fukahori-cho, Nagasaki-shi, Nagasaki             Hishi Heavy Industries Ltd. Nagasaki Research Center (72) Inventor Mitsuru Goto             1-1 Satinoura Town, Nagasaki City, Nagasaki Prefecture Mitsubishi Heavy Industries             Nagasaki Shipyard Co., Ltd. (72) Inventor Masanori Koga             1-1 Satinoura Town, Nagasaki City, Nagasaki Prefecture Mitsubishi Heavy Industries             Nagasaki Shipyard Co., Ltd. F term (reference) 2F063 AA23 BA30 BB03 BB05 BB08                       BC10 BD01 BD16 CA11 CA13                       CA40 DA01 DA05 DA08 DA23                       DB07 DD02 DD08 EA20 EB07                       EB24 EC00 GA07 GA08 GA29                       GA33 GA36 GA45 GA61 HA04                       HA05 JA04 JA08 JA09 KA02                       LA23 LA25 LA29 PA01 PA06                       ZA01                 2F069 AA44 BB30 BB40 DD15 DD30                       FF01 GG04 GG06 GG07 GG16                       GG17 GG52 GG59 GG62 GG63                       GG72 HH09 HH30 JJ02 JJ17                       JJ23 KK08 KK10 MM04 NN00                       NN09 NN17                 3H033 AA02 AA16 BB03 BB08 BB18                       BB19 CC01 DD24 EE00

Claims (13)

[Claims] 1. An axial blower having a casing including a plurality of moving blades attached to an impeller on a rotating shaft, wherein the axial flow blower is installed in a casing of the casing and has at least one of the moving blades made of metal or A clearance sensor that measures the clearance between the moving blade having a magnetic body portion and the vehicle interior, and the length of the moving blade based on the clearance measurement result, the initial value of the clearance, and the initial length of the moving blade. A moving blade life evaluation device comprising: 2. The moving blade life evaluation device according to claim 1, wherein the control unit further evaluates the life of the moving blade based on a temporal change in total strain based on the length of the moving blade. 3. The rotor blade life evaluation device according to claim 1, wherein the clearance sensor is an electromagnetic rotation sensor. 4. The moving blade life evaluation device according to claim 1, wherein the clearance sensor is a capacitance type sensor. 5. An axial blower having a casing including a plurality of moving blades attached to an impeller on a rotating shaft, wherein the axial blower is installed in a casing of the casing, and a clearance between the moving blade and the casing is provided. A blade life evaluation device comprising: a clearance sensor for measuring; and a control unit for calculating the length of the blade based on the clearance measurement result, the initial value of the clearance, and the initial length of the blade. 6. The blade life evaluation device according to claim 5, wherein the control unit further evaluates the life of the blade based on a temporal change in total strain based on the length of the blade. 7. The rotor blade life evaluation device according to claim 1, wherein the clearance sensor is a laser displacement sensor. 8. The rotor blade life evaluation device according to claim 1, wherein the clearance sensor is a pressure sensor. 9. A rotor blade surface temperature measuring unit for measuring a rotor blade surface temperature is further provided, and the controller controls the rotor blade surface temperature based on a change with time of the total strain and the rotor blade surface temperature measurement result. The moving blade life evaluation device according to claim 2, wherein the blade life is evaluated. 10. An axial flow blower comprising a moving blade life evaluation device capable of evaluating the moving blade life in real time based on the clearance between the moving blade and the vehicle interior. 11. The axial blower according to claim 10, wherein the blade life evaluation device is the blade life evaluation device according to any one of claims 1 to 9. 12. A step of measuring a clearance between a casing of a vehicle compartment and a moving blade, the length of the moving blade based on a result of the clearance measurement, an initial value of the clearance and an initial length of the moving blade. A moving blade life evaluation method comprising: a step of calculating; and a step of evaluating a life of the moving blade based on a change with time of the length of the moving blade. 13. A step of measuring the surface temperature of the moving blade, wherein the step of evaluating the life of the moving blade includes the step of measuring the surface temperature of the moving blade in addition to the change with time of the length of the moving blade. The blade life evaluation method according to claim 12, wherein the blade life is evaluated from the result.