Diagnostic Systems

Abstract

To diagnose an apparatus properly.SOLUTION: The detector includes: a vibration sensor for detecting vibrations of an apparatus; an operation unit for FFT-analyzing detection data of the vibration sensor, dividing a specific range of the frequency into a plurality of frequency ranges, calculating a partial overall value for each of the frequency ranges; and a radio communication machine for sending the partial overall value.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a detection device and a diagnostic system.

Background Art

[0002] In order to diagnose equipment, a technique for detecting vibrations generated during the operation of the equipment with a vibration sensor is known. Patent Document 1 discloses a technique for estimating whether abnormal noises occur in an in-vehicle vibration isolation device based on the partial overall value in a specific section including the frequency of abnormal noises generated in the vehicle interior.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the prior art, the partial overall value is calculated for a partial range of the frequencies detected by the vibration sensor. When the partial overall value is calculated for a partial range, it may be difficult to properly diagnose the equipment.

[0005] The present disclosure aims to properly diagnose equipment.

Means for Solving the Problems

[0006] According to the present disclosure, there is provided a detection device including a vibration sensor that detects vibrations of equipment, an arithmetic unit that performs FFT analysis on the detection data of the vibration sensor, divides a specific range of frequencies into a plurality of frequency ranges, and calculates a partial overall value for each of the plurality of frequency ranges, and a wireless communication device that transmits the partial overall value.

Effects of the Invention

[0007] According to the present disclosure, the equipment can be properly diagnosed.

Brief Description of the Drawings

[0008] [Figure 1] Figure 1 is a schematic cross-sectional view showing a detection device according to an embodiment. [Figure 2] Figure 2 is a schematic perspective view showing a thermoelectric power generation module according to an embodiment. [Figure 3] Figure 3 is a block diagram showing a diagnostic system according to an embodiment. [Figure 4] Figure 4 shows the detection data of the vibration sensor according to the embodiment. [Figure 5] Figure 5 shows the partial overall values ​​according to the embodiment. [Figure 6] Figure 6 is a schematic diagram showing a diagnostic system according to an embodiment. [Figure 7] Figure 7 is a flowchart showing the diagnostic method according to an embodiment. [Modes for carrying out the invention]

[0009] The embodiments described below will be explained with reference to the drawings, but the disclosure is not limited thereto. The components of the embodiments described below can be combined as appropriate. In addition, some components may not be used.

[0010] In this embodiment, an XYZ Cartesian coordinate system is established, and the positional relationships of each part are described with reference to this XYZ Cartesian coordinate system. The direction parallel to the X-axis within a predetermined plane is defined as the X-axis direction, the direction parallel to the Y-axis perpendicular to the X-axis within the predetermined plane is defined as the Y-axis direction, and the direction parallel to the Z-axis perpendicular to the predetermined plane is defined as the Z-axis direction. The XY plane, which includes the X-axis and Y-axis, is parallel to the predetermined plane.

[0011] [Detection device] Figure 1 is a schematic cross-sectional view showing a detection device 1 according to an embodiment. The detection device 1 is installed in equipment B. Equipment B is installed in an industrial facility such as a factory. Rotating machinery is an example of equipment B. A motor that operates a pump is an example of rotating machinery.

[0012] As shown in Figure 1, the detection device 1 comprises a heat receiving section 2, a heat dissipation section 3, a peripheral wall section 4, a thermoelectric power generation module 5, a switching section 14, a power storage section 15, a vibration sensor 6, a microcomputer 8, a wireless communication device 9, a heat transfer member 10, and a substrate 11.

[0013] The heat receiving section 2 is installed on equipment B. The heat receiving section 2 is a plate-shaped component. The heat receiving section 2 is made of a metallic material such as aluminum or copper. The heat receiving section 2 receives heat from equipment B. The heat from the heat receiving section 2 is transferred to the thermoelectric power generation module 5 via the heat transfer member 10.

[0014] The heat dissipation section 3 faces the heat receiving section 2 through a gap. The heat dissipation section 3 is a plate-shaped member. The heat dissipation section 3 is made of a metallic material such as aluminum or copper. The heat dissipation section 3 receives heat from the thermoelectric power generation module 5. The heat from the heat dissipation section 3 is released into the atmospheric space surrounding the detection device 1.

[0015] The heat receiving section 2 has a heat receiving surface 2A facing the surface of the device B, and an inner surface 2B facing the opposite direction from the heat receiving surface 2A. The heat receiving surface 2A faces the -Z direction. The inner surface 2B faces the +Z direction. Both the heat receiving surface 2A and the inner surface 2B are flat. Both the heat receiving surface 2A and the inner surface 2B are parallel to the XY plane. In the XY plane, the outer shape of the heat receiving section 2 is substantially rectangular. However, the outer shape of the heat receiving section 2 does not have to be rectangular. The outer shape of the heat receiving section 2 may be circular, elliptical, or any polygon.

[0016] The heat radiating part 3 has a heat radiating surface 3A facing the atmospheric space and an inner surface 3B facing the opposite direction of the heat radiating surface 3A. The heat radiating surface 3A faces the +Z direction. The inner surface 3B faces the -Z direction. Each of the heat radiating surface 3A and the inner surface 3B is flat. Each of the heat radiating surface 3A and the inner surface 3B is parallel to the XY plane. In the XY plane, the outer shape of the heat radiating part 3 is substantially rectangular. Note that the outer shape of the heat radiating part 3 does not have to be rectangular. The outer shape of the heat radiating part 3 may be circular, elliptical, or any polygon.

[0017] In the XY plane, the outer shape and dimensions of the heat receiving part 2 and the outer shape and dimensions of the heat radiating part 3 are substantially equal. Note that the outer shape and dimensions of the heat receiving part 2 and the outer shape and dimensions of the heat radiating part 3 may be different.

[0018] The peripheral wall part 4 is arranged between the peripheral edge of the inner surface 2B of the heat receiving part 2 and the peripheral edge of the inner surface 3B of the heat radiating part 3. The peripheral wall part 4 connects the heat receiving part 2 and the heat radiating part 3. The peripheral wall part 4 is formed of synthetic resin.

[0019] In the XY plane, the peripheral wall part 4 is annular. In the XY plane, the outer shape of the peripheral wall part 4 is substantially rectangular. The heat receiving part 2, the heat radiating part 3, and the peripheral wall part 4 define the internal space 12 of the detection device 1. The peripheral wall part 4 has an inner surface 4B facing the internal space 12. The inner surface 2B of the heat receiving part 2 faces the internal space 12. The inner surface 3B of the heat radiating part 3 faces the internal space 12. The external space of the detection device 1 is the atmospheric space around the detection device 1.

[0020] The heat receiving part 2, the heat radiating part 3, and the peripheral wall part 4 function as the housing of the detection device 1 that defines the internal space 12. In the following description, the heat receiving part 2, the heat radiating part 3, and the peripheral wall part 4 are collectively referred to as the housing 20 as appropriate.

[0021] A sealing member 13A is positioned between the peripheral edge of the inner surface 2B of the heat receiving section 2 and the -Z side end face of the peripheral wall section 4. A sealing member 13B is positioned between the peripheral edge of the inner surface 3B of the heat dissipation section 3 and the +Z side end face of the peripheral wall section 4. Each of the sealing members 13A and 13B includes, for example, an O-ring. The sealing member 13A is positioned in a recess provided on the peripheral edge of the inner surface 2B. The sealing member 13B is positioned in a recess provided on the peripheral edge of the inner surface 3B. The sealing members 13A and 13B prevent foreign matter from the external space of the detection device 1 from entering the internal space 12.

[0022] The thermoelectric power generation module 5 generates electricity using the Seebeck effect. Equipment B functions as a heat source for the thermoelectric power generation module 5. The thermoelectric power generation module 5 is placed between the heat receiving section 2 and the heat dissipation section 3. The thermoelectric power generation module 5 generates electricity when the -Z end face 51 of the thermoelectric power generation module 5 is heated and a temperature difference is created between the -Z end face 51 and the +Z end face 52 of the thermoelectric power generation module 5.

[0023] End face 51 faces in the -Z direction. End face 52 faces in the +Z direction. Both end face 51 and end face 52 are flat. Both end face 51 and end face 52 are parallel to the XY plane. Within the XY plane, the outer shape of the thermoelectric power generation module 5 is substantially rectangular.

[0024] The end face 52 faces the inner surface 3B of the heat dissipation section 3. The thermoelectric power generation module 5 is fixed to the heat dissipation section 3. The heat dissipation section 3 and the thermoelectric power generation module 5 are bonded together, for example, with an adhesive.

[0025] In the example shown in Figure 1, the thermoelectric power generation module 5 is in contact with the heat dissipation section 3, but it may also be in contact with the heat receiving section 2.

[0026] The energy storage unit 15 stores the electricity generated by the thermoelectric power generation module 5. Examples of the energy storage unit 15 include a capacitor or a secondary battery.

[0027] The switching unit 14 operates to switch between a storage state in which the power generated by the thermoelectric power generation module 5 is supplied to the power storage unit 15, and a supply state in which the power stored in the power storage unit 15 is supplied to the vibration sensor 6, the microcomputer 8, and the wireless communication device 9, respectively. A DC / DC converter is an example of the switching unit 14.

[0028] The vibration sensor 6 detects vibrations of equipment B. The vibration sensor 6 is driven by the power generated by the thermoelectric power generation module 5. The vibration sensor 6 is located in the internal space 12. In this embodiment, the vibration sensor 6 is supported on the inner surface 2B of the heat receiving section 2.

[0029] An acceleration sensor is given as an example of the vibration sensor 6. The vibration sensor 6 may also be a velocity sensor or a displacement sensor. In this embodiment, the vibration sensor 6 can detect vibrations of the device B in three directions: the X-axis direction, the Y-axis direction, and the Z-axis direction.

[0030] The microcomputer 8 controls the detection device 1. The microcomputer 8 is powered by the electricity generated by the thermoelectric power generation module 5. The microcomputer 8 is located in the internal space 12. In this embodiment, the microcomputer 8 is supported on the substrate 11.

[0031] The wireless communication device 9 communicates with a management computer 100 located outside the detection device 1. The wireless communication device 9 is powered by electricity generated by the thermoelectric power generation module 5. The wireless communication device 9 is located in the internal space 12. In this embodiment, the wireless communication device 9 is supported by a substrate 11.

[0032] The heat transfer member 10 connects the heat receiving section 2 and the thermoelectric power generation module 5. The heat transfer member 10 transfers heat from the heat receiving section 2 to the thermoelectric power generation module 5. The heat transfer member 10 is made of a metallic material such as aluminum or copper. The heat transfer member 10 is a rod-shaped member that is long in the Z-axis direction. The heat transfer member 10 is placed in the internal space 12.

[0033] The substrate 11 includes a control board. The substrate 11 is placed in the internal space 12. The substrate 11 is connected to the heat receiving section 2 via a support member 11A. The substrate 11 is connected to the heat dissipation section 3 via a support member 11B. The substrate 11 is supported by the support members 11A and 11B so as to be away from the heat receiving section 2 and the heat dissipation section 3, respectively.

[0034] [Thermoelectric power generation module] Figure 2 is a schematic perspective view showing a thermoelectric power generation module 5 according to an embodiment. The thermoelectric power generation module 5 includes a p-type thermoelectric semiconductor element 5P, an n-type thermoelectric semiconductor element 5N, a first electrode 53, a second electrode 54, a first substrate 51S, and a second substrate 52S. In the XY plane, the p-type thermoelectric semiconductor element 5P and the n-type thermoelectric semiconductor element 5N are arranged alternately. The first electrode 53 is connected to the p-type thermoelectric semiconductor element 5P and the n-type thermoelectric semiconductor element 5N, respectively. The second electrode 54 is connected to the p-type thermoelectric semiconductor element 5P and the n-type thermoelectric semiconductor element 5N, respectively. The lower surface of the p-type thermoelectric semiconductor element 5P and the lower surface of the n-type thermoelectric semiconductor element 5N are connected to the first electrode 53. The upper surface of the p-type thermoelectric semiconductor element 5P and the upper surface of the n-type thermoelectric semiconductor element 5N are connected to the second electrode 54. The first electrode 53 is connected to the first substrate 51S. The second electrode 54 is connected to the second substrate 52S.

[0035] Each of the p-type thermoelectric semiconductor element 5P and the n-type thermoelectric semiconductor element 5N includes, for example, a BiTe-based thermoelectric material. Each of the first substrate 51S and the second substrate 52S is formed from an electrically insulating material such as ceramics or polyimide.

[0036] The first substrate 51S has an end face 51. The second substrate 52S has an end face 52. When the first substrate 51S is heated, a temperature difference is created between the +Z side end and the -Z side end of the p-type thermoelectric semiconductor element 5P and the n-type thermoelectric semiconductor element 5N, respectively. When a temperature difference is created between the +Z side end and the -Z side end of the p-type thermoelectric semiconductor element 5P, holes move in the p-type thermoelectric semiconductor element 5P. When a temperature difference is created between the +Z side end and the -Z side end of the n-type thermoelectric semiconductor element 5N, electrons move in the n-type thermoelectric semiconductor element 5N. The p-type thermoelectric semiconductor element 5P and the n-type thermoelectric semiconductor element 5N are connected via a first electrode 53 and a second electrode 54. A potential difference is created between the first electrode 53 and the second electrode 54 by the holes and electrons. The thermoelectric power generation module 5 generates power due to the potential difference created between the first electrode 53 and the second electrode 54. A lead wire 55 is connected to the first electrode 53. The thermoelectric power generation module 5 outputs power via lead wires 55.

[0037] [Diagnostic System] Figure 3 is a block diagram showing a diagnostic system 200 according to an embodiment. The diagnostic system 200 comprises a detection device 1 and a management computer 100 located outside the detection device 1. The detection device 1 includes a thermoelectric power generation module 5, a switching unit 14, a power storage unit 15, a vibration sensor 6, a microcomputer 8, and a wireless communication device 9. The thermoelectric power generation module 5, the switching unit 14, the power storage unit 15, the vibration sensor 6, the microcomputer 8, and the wireless communication device 9 are housed in a single housing 20.

[0038] The microcomputer 8 includes a sensor data acquisition unit 81, a calculation unit 82, a power supply control unit 83, and a communication control unit 84.

[0039] The sensor data acquisition unit 81 acquires detection data from the vibration sensor 6. The detection data from the vibration sensor 6 includes the vibration waveform.

[0040] The calculation unit 82 performs calculation processing based on the detection data of the vibration sensor 6 acquired by the sensor data acquisition unit 81. In the embodiment, the calculation unit 82 performs Fast Fourier Transform (FFT) analysis on the detection data of the vibration sensor 6, divides a specific range of frequencies in the spectrum obtained by the FFT analysis into multiple frequency ranges, and calculates a Partial Overall Value for each of the multiple frequency ranges. In the embodiment, the calculation unit 82 divides the entire range of vibration frequencies detected by the vibration sensor 6 into multiple frequency ranges and calculates a Partial Overall Value for each of the multiple frequency ranges.

[0041] In this embodiment, the calculation unit 82 can calculate the overall value of the detection data from the vibration sensor 6. The calculation unit 82 can calculate the overall value of the entire range of the vibration waveform detected by the vibration sensor 6.

[0042] The overall value refers to the sum of the power spectrum over the entire frequency range targeted by the Fast Fourier Transform (FFT) analysis. The partial overall value refers to the overall value calculated for a limited frequency range.

[0043] In this embodiment, the calculation unit 82 can calculate the Root Mean Square Value (RMS) of the data detected by the vibration sensor 6. The calculation unit 82 can also divide the entire range of the vibration waveform detected by the vibration sensor 6 into multiple frequency ranges and calculate the RMS value for each of the multiple frequency ranges. The RMS value of the vibration may be the RMS value of acceleration, the RMS value of velocity, or the RMS value of displacement.

[0044] The calculation unit 82 may also calculate the peak value of the detection data from the vibration sensor 6. The peak value of vibration includes the maximum and minimum values ​​of vibration. The peak value of vibration may be the peak value over the entire range of the vibration waveform, or it may be the peak value in each of multiple frequency ranges. The peak value of vibration may be the peak value of acceleration, the peak value of velocity, or the peak value of displacement.

[0045] The power control unit 83 controls the switching unit 14 so that the power supply state and the power storage state are switched. The power control unit 83 monitors the amount of power stored in the power storage unit 15, and when the amount of power stored in the power storage unit 15 reaches a specified value, it controls the switching unit 14 to switch from the power storage state to the power supply state.

[0046] The electricity generated by the thermoelectric power generation module 5 is boosted by a booster unit (not shown) and then supplied to the switching unit 14. If the amount of electricity stored in the energy storage unit 15 has not reached a specified value, the power control unit 83 controls the switching unit 14 so that the electricity generated by the thermoelectric power generation module 5 is supplied to the energy storage unit 15. The energy storage unit 15 stores the electricity generated by the thermoelectric power generation module 5.

[0047] When the amount of charge stored in the power storage unit 15 exceeds a specified value, power is released from the power storage unit 15. The power control unit 83 controls the switching unit 14 so that the power released from the power storage unit 15 is supplied to the vibration sensor 6, the microcomputer 8, and the wireless communication device 9, respectively. The vibration sensor 6, the microcomputer 8, and the wireless communication device 9 each consume the power supplied from the power storage unit 15.

[0048] After power is released from the energy storage unit 15, the power control unit 83 controls the switching unit 14 so that the power generated by the thermoelectric power generation module 5 is supplied to the energy storage unit 15. The energy storage unit 15 then stores the power generated by the thermoelectric power generation module 5 again.

[0049] When the amount of charge stored in the power storage unit 15 exceeds a specified value, power is released from the power storage unit 15. The power control unit 83 controls the switching unit 14 so that the power released from the power storage unit 15 is supplied again to the vibration sensor 6, the microcomputer 8, and the wireless communication device 9. Each of the vibration sensor 6, the microcomputer 8, and the wireless communication device 9 consumes the power supplied from the power storage unit 15.

[0050] In this manner, the system alternates between a state where the power generated by the thermoelectric power generation module 5 is supplied to the power storage unit 15, and a state where the power stored in the power storage unit 15 is supplied to the vibration sensor 6, microcomputer 8, and wireless communication device 9, respectively. Power storage in the power storage unit 15 is performed intermittently. Power is also supplied to the vibration sensor 6, microcomputer 8, and wireless communication device 9, respectively, intermittently.

[0051] The communication control unit 84 controls the wireless communication device 9 so that multiple partial overall values ​​calculated by the calculation unit 82 are transmitted to the management computer 100. The wireless communication device 9 transmits multiple partial overall values ​​calculated by the calculation unit 82 to the management computer 100.

[0052] In this embodiment, when the calculation unit 82 calculates an overall value, an effective value, or a peak value, the communication control unit 84 controls the wireless communication device 9 so that the overall value, effective value, or peak value is transmitted to the management computer 100. The wireless communication device 9 transmits the overall value, effective value, or peak value calculated by the calculation unit 82 to the management computer 100.

[0053] The management computer 100 receives the partial overall value transmitted from the detection device 1 and diagnoses whether or not there is an abnormality in device B.

[0054] [Operation] Figure 4 shows the detection data of the vibration sensor 6 according to the embodiment. Figure 5 shows the partial overall value according to the embodiment.

[0055] In the examples shown in Figures 4 and 5, the equipment B on which the detection device 1 is installed is a motor, which is a type of rotating machine. The motor operates a pump. Figure 4(A) shows the detection data of the vibration sensor 6 when the motor bearing is in a normal state. Figure 4(B) shows the detection data of the vibration sensor 6 when the motor bearing is in an abnormal state. Figure 4(A) shows the detection data when the bearing is not damaged, and Figure 4(B) shows the detection data when the bearing has been intentionally damaged. Figure 5(A) shows the partial overall value calculated from the detection data shown in Figure 4(A). Figure 5(B) shows the partial overall value calculated from the detection data shown in Figure 4(B).

[0056] The vertical axis in Figure 4 represents the power spectral density of device B detected by the vibration sensor 6 [(m / s²). 2 ) 2 The horizontal axis shows the frequency [Hz]. The vertical axis of Figure 5 shows the overall value [(m / s 2 ) 2 The horizontal axis shows the frequency ranges divided to calculate the partial overall value.

[0057] In this embodiment, the vibration sensor 6 can detect vibration waveforms. The overall value is the sum of the power spectrum (power spectral density) over the entire range obtained from the FFT analysis. The partial overall value is an overall value obtained by limiting the frequency range over which the sum of the power spectrum (power spectral density) is calculated.

[0058] As shown in Figure 4(B), when the bearing is in an abnormal state, the acceleration increases at a specific frequency.

[0059] As shown in Figure 5, the calculation unit 82 divides the entire frequency range of the spectrum obtained by performing FFT analysis on the detection data of the vibration sensor 6 (100 Hz to 2600 Hz) into multiple frequency ranges. In this embodiment, the calculation unit 82 divides the entire frequency range detected by the vibration sensor 6 (100 Hz to 2600 Hz) into a first frequency range to an eleventh frequency range. Each frequency range is approximately 250 Hz.

[0060] In an embodiment, the first frequency range is 100 Hz to 250 Hz. The second frequency range is 251 Hz to 500 Hz. The third frequency range is 501 Hz to 750 Hz. The fourth frequency range is 751 Hz to 1000 Hz. The fifth frequency range is 1001 Hz to 1250 Hz. The sixth frequency range is 1251 Hz to 1500 Hz. The seventh frequency range is 1501 Hz to 1750 Hz. The eighth frequency range is 1751 Hz to 2000 Hz. The ninth frequency range is 2001 Hz to 2250 Hz. The tenth frequency range is 2251 Hz to 2500 Hz. The 11th frequency range is the range between 2501 Hz and 2600 Hz.

[0061] The calculation unit 82 calculates partial overall values ​​for each of the multiple frequency ranges. Specifically, the calculation unit 82 calculates a first partial overall value POA1 for the first frequency range and a second partial overall value POA2 for the second frequency range. Similarly, the calculation unit 82 calculates the third partial overall value POA3 to the eleventh partial overall value POA11 for each of the third to eleventh frequency ranges. In this way, the calculation unit 82 calculates partial overall values ​​for all of the multiple frequency ranges. The number of partial overall values ​​calculated is the same as the number of divisions in the frequency range. In the example shown in Figure 5, the number of frequency divisions is 11. The calculation unit 82 calculates 11 partial overall values.

[0062] In the example shown in Figure 5, there are multiple frequencies at which the overall value is large. For these multiple frequencies at which the overall value is large, an integer multiple relationship holds.

[0063] In the example shown in Figure 5, the entire spectrum detected by the vibration sensor 6 and obtained through calculation is divided into 11 frequency ranges. The number of divisions in the frequency range is not limited to 11; it is sufficient for the number of divisions to be 2 or more. Also, in the example shown in Figure 5, one frequency range is assumed to be approximately 250 Hz. One frequency range is not limited to 250 Hz. The frequency range and the number of divisions are determined based on the characteristics of equipment B. For example, if equipment B is a gear, which is a type of rotating machine, and the gear is in an abnormal state, the frequencies at which the overall value is large can be generally identified based on the number of teeth or rotational speed. Furthermore, an integer multiple relationship holds for multiple frequencies at which the overall value is large. The calculation unit 82 can set the frequency range and the number of divisions based on the known data of equipment B's characteristics so that the frequencies at which the overall value is large are included in one frequency range.

[0064] [Diagnosis Method] Figure 6 is a schematic diagram showing the diagnostic system 200 according to the embodiment. Figure 7 is a flowchart showing the diagnostic method according to the embodiment.

[0065] As shown in Figure 6, the diagnostic system 200 comprises multiple detection devices 1 installed on equipment B. Multiple equipment B are installed in an industrial facility. In the example shown in Figure 6, multiple detection devices 1 are installed on one piece of equipment B. As mentioned above, a motor that operates a pump is an example of equipment B. Equipment B may be installed underground. When equipment B operates, equipment B generates heat. Equipment B functions as a heat source for the thermoelectric power generation module 5.

[0066] When device B operates and generates heat, a temperature difference is created between the heat receiving section 2 and the heat dissipation section 3. The thermoelectric power generation module 5 generates electricity based on the temperature difference between the heat receiving section 2 and the heat dissipation section 3. The electricity generated by the thermoelectric power generation module 5 is stored in the energy storage section 15.

[0067] The power control unit 83 monitors the amount of energy stored in the energy storage unit 15. The power control unit 83 determines whether the amount of energy stored in the energy storage unit 15 is equal to or greater than a specified value (step S1).

[0068] In step S1, if it is determined that the amount of charge stored in the energy storage unit 15 is equal to or greater than a specified value (step S1: Yes), the power control unit 83 controls the switching unit 14 to switch from the energy storage state to the energy supply state. The energy storage unit 15 discharges (step S2).

[0069] The power control unit 83 controls the switching unit 14 so that the power released from the energy storage unit 15 is supplied to the vibration sensor 6, the microcomputer 8, and the wireless communication device 9, respectively. The vibration sensor 6, the microcomputer 8, and the wireless communication device 9 are each driven by the power supplied from the energy storage unit 15.

[0070] The vibration sensor 6 detects vibrations from equipment B. The sensor data acquisition unit 81 acquires the detection data from the vibration sensor 6 (step S3).

[0071] The calculation unit 82 performs an FFT analysis on the detection data from the vibration sensor 6 acquired by the sensor data acquisition unit 81 (step S4).

[0072] The calculation unit 82 divides the entire frequency range of the spectrum obtained in step S4 into multiple frequency ranges. As described with reference to Figure 5, in this embodiment, the calculation unit 82 divides the entire frequency range of the spectrum obtained in step S4 into 11 frequency ranges. The calculation unit 82 calculates a partial overall value for each of the multiple frequency ranges. That is, the calculation unit 82 calculates the first partial overall value POA1 for the first frequency range to the 11th partial overall value for the 11th frequency range (step S5).

[0073] The communication control unit 84 causes the wireless communication device 9 to transmit the multiple partial overall values ​​(from the first partial overall value POA1 to the eleventh partial overall value POA11) calculated in step S5. The wireless communication device 9 transmits the multiple partial overall values ​​to the management computer 100 (step S6).

[0074] As shown in Figure 6, the diagnostic system 200 includes a communication device 210 and a plurality of repeaters 220.

[0075] The repeater 220 relays signals between the detection device 1 and the communication device 210. The repeater 220 and the communication device 210 communicate wirelessly. The partial overall value from the wireless communication device 9 is transmitted to the communication device 210 via the repeater 220. The communication device 210 receives partial overall values ​​from each of the multiple detection devices 1.

[0076] The communication device 210 receives partial overall values ​​transmitted from each of the multiple detection devices 1 via the repeater 220 and transmits them to the management computer 100. The communication device 210 processes the partial overall values ​​transmitted from each of the multiple detection devices 1 into a predetermined format and then transmits them to the management computer 100. The partial overall values ​​from each of the multiple detection devices 1 are aggregated by the communication device 210 and then transmitted to the management computer 100. The communication device 210 and the management computer 100 may communicate wirelessly or via wired communication.

[0077] The management computer 100 can monitor and manage the status of multiple devices B based on the partial overall values ​​transmitted from each of the multiple detection devices 1. The management computer 100 can diagnose whether or not there is an abnormality in the devices B based on the partial overall values ​​transmitted from each of the multiple detection devices 1.

[0078] In this embodiment, multiple detection devices 1 can independently transmit partial overall values. That is, a detection device 1 can transmit partial overall values ​​without being affected by other detection devices 1.

[0079] For example, if equipment B and detection device 1 are located underground, and the communication device 210 and management computer 100 are located above ground, the relay device 220 ensures that the partial overall value transmitted from detection device 1 is smoothly transmitted to the management computer 100.

[0080] In step S1, if it is determined that the amount of charge stored in the energy storage unit 15 is not equal to or greater than a specified value (step S1: No), the power control unit 83 controls the switching unit 14 so that the energy storage state continues. The energy storage unit 15 stores energy (step S7).

[0081] In this embodiment, power is supplied intermittently to the vibration sensor 6, the microcomputer 8, and the wireless communication device 9. When the amount of charge stored in the power storage unit 15 exceeds a specified value, the wireless communication device 9 transmits a partial overall value.

[0082] The greater the temperature difference between the heat receiving section 2 and the heat dissipation section 3, the greater the power generated by the thermoelectric power generation module 5. In other words, the greater the temperature difference between the heat receiving section 2 and the heat dissipation section 3, the faster the power generated by the thermoelectric power generation module 5 can be stored in the energy storage section 15. Therefore, the greater the temperature difference between the heat receiving section 2 and the heat dissipation section 3, the shorter the period during which the wireless communication device 9 transmits the partial overall value. If an abnormality occurs in equipment B, the amount of heat generated by equipment B is likely to increase. In other words, if an abnormality occurs in equipment B, the temperature difference between the heat receiving section 2 and the heat dissipation section 3 is likely to increase. Therefore, if an abnormality occurs in equipment B, the period during which the wireless communication device 9 transmits the partial overall value becomes shorter. If an abnormality occurs in equipment B, the amount of partial overall value data transmitted from the detection device 1 to the management computer 100 increases, allowing the management computer 100 to efficiently analyze whether or not an abnormality has occurred in equipment B.

[0083] [effect] As described above, according to the embodiment, the vibration sensor 6 is installed in the device B. The detection data from the vibration sensor 6 is output to the microcomputer 8. The calculation unit 82 of the microcomputer 8 performs an FFT analysis on the detection data from the vibration sensor 6, divides a specific range of frequencies in the spectrum obtained by the FFT analysis into multiple frequency ranges, and calculates a partial overall value for each of the multiple frequency ranges. The partial overall value is calculated not for a portion of the frequency range detected by the vibration sensor 6, but for all of the multiple frequency ranges. The multiple partial overall values ​​calculated by the calculation unit 82 are transmitted from the wireless communication device 9 to the management computer 100. Therefore, the management computer 100 can properly diagnose the device B based on the multiple partial overall values.

[0084] The wireless communication device 9 transmits the partial overall value calculated by the calculation unit 82. The amount of data for the partial overall value is smaller than the amount of data for the detection data acquired by the sensor data acquisition unit 81. Therefore, even if the data communication capability of the communication line is poor, for example, the wireless communication device 9 can smoothly transmit the partial overall value, which has a small amount of data, to the management computer 100.

[0085] In this embodiment, the calculation unit 82 can calculate the overall value of the vibration waveform detected by the vibration sensor 6. The overall value calculated by the calculation unit 82 is transmitted from the wireless communication device 9 to the management computer 100, allowing the management computer 100 to more accurately diagnose the device B based on multiple partial overall values ​​and overall values.

[0086] In this embodiment, the calculation unit 82 can calculate the effective value or peak value of the detection data from the vibration sensor 6. The effective value or peak value calculated by the calculation unit 82 is transmitted from the wireless communication device 9 to the management computer 100, allowing the management computer 100 to more accurately diagnose the device B based on multiple partial overall values, effective values, or peak values.

[0087] In this embodiment, the detection device 1 includes a thermoelectric power generation module 5 that functions as a power source for the vibration sensor 6, the microcomputer 8, and the wireless communication device 9. The thermoelectric power generation module 5 can generate electricity from the temperature difference between the heat receiving section 2 and the heat dissipation section 3. The vibration sensor 6 is driven by the power generated by the thermoelectric power generation module 5. The wireless communication device 9 is driven by the power generated by the thermoelectric power generation module 5 and transmits the partial overall value. This allows the vibration sensor 6 and the wireless communication device 9 to be driven without using a cable to connect the vibration sensor 6 to a battery or commercial power supply. By simply installing the detection device 1 on equipment B, the partial overall value is transmitted to the management computer 100. Based on the partial overall value, the management computer 100 can efficiently diagnose whether or not there is an abnormality in equipment B. Even if there are multiple pieces of equipment B in an industrial facility, by simply installing the detection device 1 on each of the multiple pieces of equipment B, the management computer 100 can efficiently diagnose whether or not there is an abnormality in each of the multiple pieces of equipment B.

[0088] The thermoelectric power generation module 5, vibration sensor 6, microcomputer 8, and wireless communication device 9 are housed in a single housing 20. This reduces the impact of noise on the detection data of, for example, the vibration sensor 6.

[0089] The diagnostic system 200 comprises multiple detection devices 1 installed on each of the multiple pieces of equipment B, and a communication device 210 that receives partial overall values ​​transmitted from each of the multiple detection devices 1 and transmits them to the management computer 100. Therefore, the management computer 100 can monitor and manage the status of the multiple pieces of equipment B and diagnose whether or not there are any abnormalities in the multiple pieces of equipment B. Furthermore, since the thermoelectric power generation module 5 functions as a power source and the wireless communication device 9 wirelessly transmits the partial overall values, partial overall values ​​can be easily collected simply by installing the detection devices 1 on the pieces of equipment B, for example, without having to lay cables in an industrial facility.

[0090] [Other embodiments] In the above-described embodiment, the management computer 100 may consist of one computer or multiple computers.

[0091] In the above-described embodiment, a thermoelectric power generation module 5, a vibration sensor 6, a microcomputer 8, and a wireless communication device 9 are housed in one housing 20. The thermoelectric power generation module 5 may be housed in a first housing, and the vibration sensor 6, microcomputer 8, and wireless communication device 9 may be housed in a second housing. The first housing and the second housing are separate housings. The energy storage unit 15 may be located between the first housing and the second housing.

[0092] In the above-described embodiment, the functions of the calculation unit 82 may be provided in the management computer 100. The detection data from the vibration sensor 6 may be transmitted to the management computer 100 via the wireless communication device 9, and the management computer 100 may calculate the partial overall value. Alternatively, the functions of the management computer 100 may be provided in the microcomputer 8. For example, the calculation unit 82 may diagnose whether or not there is an abnormality. [Explanation of Symbols]

[0093] 1...Detection device, 2...Heat receiving section, 2A...Heat receiving surface, 2B...Inner surface, 3...Heat dissipation section, 3A...Heat dissipation surface, 3B...Inner surface, 4...Peripheral wall section, 4B...Inner surface, 5...Thermoelectric power generation module, 5N...n-type thermoelectric semiconductor element, 5P...p-type thermoelectric semiconductor element, 6...Vibration sensor, 8...Microcomputer, 9...Wireless communication device, 10...Heat transfer member, 11...Substrate, 11A...Support member, 11B...Support member, 12...Internal space, 13A...Seal section Material, 13B...Sealing member, 14...Switching unit, 15...Energy storage unit, 20...Housing, 51...End face, 51S...First substrate, 52...End face, 52S...Second substrate, 53...First electrode, 54...Second electrode, 55...Lead wire, 81...Sensor data acquisition unit, 82...Calculation unit, 83...Power supply control unit, 84...Communication control unit, 100...Management computer, 200...Diagnostic system, 210...Communication device, 220...Repeater, B...Equipment.

Claims

1. a vibration sensor that detects vibrations of the device; a calculation unit that performs FFT analysis on the detection data of the vibration sensor, divides a specific frequency range into a plurality of frequency ranges, and calculates a partial overall value for each of the plurality of frequency ranges; a wireless communication device that transmits the partial overall value. Detection device.

2. the calculation unit calculates an overall value, an effective value, or a peak value of the detection data, the wireless communication device transmits the overall value, the effective value, or the peak value. The detection device according to claim 1.

3. Equipped with a thermoelectric power generation module, the vibration sensor is driven by the power generated by the thermoelectric power generation module.

3. The detection device according to claim 1 or claim 2.

4. the thermoelectric power generation module, the vibration sensor, and the wireless communication device are accommodated in a single housing. The detection device according to claim 3.

5. A detection device according to any one of claims 1 to 4; a management computer that receives the partial overall value transmitted from the detection device and diagnoses the equipment, Diagnostic system.

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