JP2021165696A - Abnormality detection device - Google Patents

Abstract

To provide an abnormality detection device capable of providing information to be used to determine bearing abnormality.SOLUTION: A control part 160 of an abnormality detection device 130 performs Fourier transformation of a detection value of a detector 140 during initial driving of motors 31 within a prescribed rotational speed range among a plurality of rotational speed ranges obtained by dividing the speed of the motors 31 from the minimum rotational speed to the maximum rotational speed after a water supply device 10 is established at an installation site, calculates an amplitude spectrum of a prescribed frequency band to store initial data F based on the amplitude spectrum in a storage part 150, performs Fourier transformation of a detection value of the detector 140 during driving after an initial stage to calculate an amplitude spectrum of the prescribed frequency band, stores operation data C based on the amplitude spectrum in the storage part 150, operates the ratio of the operation data C to the initial data F, and transmits information of the amplitude spectrum obtained by performing Fourier transformation of the detection value of the detector 140 within the prescribed rotational speed range to an external device 156 through a communication part 155 when a bearing 37 is determined to be normal on the basis of the ratio and thresholds T1, T2.SELECTED DRAWING: Figure 1

Description

The present invention relates to, for example, an abnormality detecting device capable of detecting an abnormality in a bearing of a rotating machine.

Conventionally, a configuration including a pump and a motor for driving the pump has been known as a water supply device for supplying water to a water supply destination such as a building. In such a water supply device, for example, due to long-term operation, the raceway surface on which the rolling element moves is damaged on both the inner ring and the outer ring of the rolling bearing of the motor, the rolling element is damaged, and dust is generated on the rolling bearing. Abnormalities such as infiltration or insufficient lubrication due to insufficient grease in rolling bearings may occur.

Therefore, conventionally, it is known that when an abnormality such as a bearing of a motor is detected, a failure is displayed on the control panel of the water supply device and an alarm signal is issued to the management destination of the water supply device. When the management destination receives the alarm, it prepares the necessary preparations for repairing the parts that have detected the abnormality, and when the preparations are completed, the worker goes to the water supply device to perform the repair work.

Further, there is also known a technique of acquiring operation information from a control panel that controls the operation of a water supply device by a communication device and periodically transmitting it to a remote control center (see, for example, Patent Document 1). The operation information includes a setting item which is a target value of the discharge pressure and a starting pressure of the pump, and an operation item which is an actual discharge pressure and a current value supplied to the motor.

Japanese Unexamined Patent Publication No. 2008-19763

In the above-described configuration in which setting items and operation items are acquired as operation information from the control panel by a communication device and operation information is periodically transmitted, the obtained information is the setting items and operation items, such as pump bearings and the like. It is not information used to judge abnormalities.

Therefore, an object of the present invention is to provide an abnormality detecting device capable of providing information used for determining an abnormality of a bearing.

The abnormality detection device according to the embodiment of the present invention includes a detector for detecting vibration or sound pressure of the bearing of a rotating machine including a rotating shaft and a bearing supporting the rotating shaft, and a threshold for determining an abnormality. After the rotating machine is installed at the installation site, the storage unit that stores the above, the communication unit that communicates with the external device, and the rotation speed range from the minimum rotation speed to the maximum rotation speed of the rotation machine are divided into a plurality of rotation speed ranges. The detection value of the detector at the time of initial driving in a predetermined rotation speed range is Fourier-transformed to obtain an amplitude spectrum in a predetermined frequency band, and initial data based on this amplitude spectrum is stored in the storage unit. The detection value of the detector at the time of driving the rotating machine after the initial stage in the predetermined rotation speed range is Fourier-converted to obtain the amplitude spectrum of the predetermined frequency band, and the operation data based on the amplitude spectrum is stored in the storage unit. When the ratio of the operation data to the initial data is calculated and the bearing is determined to be normal based on the ratio and the threshold value, the external device is provided with the predetermined rotation speed range via the communication unit. A control unit for transmitting information on an amplitude spectrum obtained by Fourier transforming the detection value of the detector in the above.

According to the present invention, it is possible to provide an abnormality detecting device capable of providing information used for determining an abnormality of a bearing.

The front view which shows the structure of the water supply device which includes the abnormality detection device which concerns on one Embodiment of this invention. The side view which shows the structure of the water supply device. The block diagram which shows the structure of the pressure detector, the flow rate detector, the abnormality detection device, and the pump control device used in the water supply device. The cross-sectional view which shows the main part of the pump device used for the water supply device, and the configuration of the abnormality detection device. The cross-sectional view which shows the structure of the abnormality detection apparatus. An explanatory diagram showing initial data and a threshold value stored in a storage unit used in the abnormality detection device. The flow chart which shows an example of the operation of the abnormality detection device. The graph which shows the relationship between the frequency and the amplitude spectrum in the predetermined frequency band obtained by Fourier transforming the detection value of the detector used in the anomaly detection apparatus. The graph which shows the relationship between the frequency and the amplitude spectrum in the predetermined frequency band obtained by Fourier transforming the detection value of the detector used in the anomaly detection apparatus. The graph which shows the relationship between the frequency and the amplitude spectrum in the predetermined frequency band obtained by Fourier transforming the detection value of the detector used in the anomaly detection apparatus. The explanatory view which shows the information transmitted from the communication part of the abnormality detection device to an external device.

Hereinafter, the water supply device 10 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 11.

FIG. 1 is a front view showing the configuration of the water supply device 10. FIG. 2 is a side view showing the configuration of the water supply device 10. FIG. 3 is a block diagram showing the configurations of the flow rate detector 100, the pressure detector 110, the abnormality detection device 130, and the pump control device 120 used in the water supply device 10.

FIG. 4 is a cross-sectional view showing a main part of the pump device 30 used in the water supply device 10 and a configuration of the abnormality detection device 130. FIG. 5 is a cross-sectional view showing the configuration of the abnormality detection device 130.

FIG. 6 is an explanatory diagram showing initial data F and threshold value T stored in the storage unit 150 used in the abnormality detection device 130. FIG. 7 is a flow chart showing an example of the operation of the abnormality detection device 130.

FIG. 8 is a graph showing the relationship between the frequency and the amplitude spectrum in the predetermined frequency band 2500 to 3500 (Hz) obtained by Fourier transforming the detection value of the detector 140 used in the abnormality detection device 130. FIG. 9 is a graph showing the relationship between the frequency and the amplitude spectrum in the predetermined frequency band 3,000 to 6000 (Hz) obtained by Fourier transforming the detection value of the detector 140 used in the abnormality detection device 130. FIG. 10 is a graph showing the relationship between the frequency and the amplitude spectrum in the predetermined frequency band 6000 to 8500 (Hz) obtained by Fourier transforming the detection value of the detector 140 used in the abnormality detection device 130. FIG. 11 is an explanatory diagram showing information transmitted from the communication unit 155 of the abnormality detection device 130 to the external device 156.

As shown in FIGS. 1 and 2, the water supply device 10 includes a base 20, a plurality of pump devices 30 arranged on the base 20, and a plurality of discharges connected to the secondary side of the plurality of pump devices 30, respectively. A pipe 40, a check valve 50 provided in each discharge pipe 40, an on-off valve 60 provided in each discharge pipe 40, a connecting pipe 70 for connecting a plurality of discharge pipes 40, and a connecting pipe provided in the connecting pipe 70. Controls the operation of the 80, the pressure accumulator 90 provided in the connecting pipe 80, the flow rate detector 100 provided in each discharge pipe 40, the pressure detector 110 for detecting the pressure in the connecting pipe 70, and each pump device 30. The pump control device 120 is provided.

Further, as shown in FIG. 3, the water supply device 10 includes an abnormality detection device 130 for detecting an abnormality in the bearing of the rotating machine used in the water supply device 10. A rotating machine is a machine including a rotating shaft and bearings that support the rotating shaft. The rotating machine used in the water supply device 10 is, for example, the motor 31 and the pump 32 used in the pump device 30. The water supply device 10 pumps the water from the water source by the pump device 30 and supplies the water to the water supply destination via the discharge pipe 40 and the connecting pipe 70.

The pump device 30 includes a motor 31, a pump 32, a spindle 33 connecting the motor 31 and the pump 32, and a shaft sealing device 34. The primary side of the pump device 30 is connected to a water source such as a water receiving tank. The pump device 30 is, for example, a so-called vertical multi-stage turbine pump in which a main shaft 33 is extended along the direction of gravity and a motor 31 is arranged above the pump 32. For example, three pump devices 30 are provided. The three pumping devices 30 are arranged on the base 20 side by side, for example, in one direction.

The motor 31 is electrically connected to an inverter housed in a control board 122 of the pump control device 120, which will be described later. The motor 31 includes, for example, a motor frame 35, a stator, a rotor, a rotating shaft 36, a bearing 37 on the pump 32 side, and a bearing on the opposite side of the pump 32.

The motor frame 35 is fixed to, for example, a frame body 38 that houses a stator and a rotor inside and a pump 32 side of the frame body 38, a bearing 37 on the pump 32 side is fixed, and is fixed to the upper part of the pump 32. The motor bracket 39 is provided.

The frame body 38 is formed in a cylindrical shape having an opening on the pump 32 side.
As shown in FIG. 4, the motor bracket 39 has a cylindrical bracket main body 39a and a bottom wall portion 39b provided at one end of the bracket main body 39a.

The bracket body 39a is formed, for example, in a cylindrical shape. The inner peripheral surface of the bracket body 39a is formed so that the bearing 37 can be fixed, for example, by fitting. The bracket body 39a has, for example, a flange 39c. As shown in FIGS. 1 and 2, the flange 39c is fixed to the frame body 38 by a fixing member 39d such as a bolt. The bottom wall portion 39b is formed with a hole for arranging a part of the rotating shaft 36. The stator and the rotor are housed in the frame main body 38.
The rotating shaft 36 is fixed to the rotor. The rotating shaft 36 is connected to the main shaft 33.

As shown in FIG. 4, the bearing 37 is a rolling bearing. The bearing 37 includes an outer ring 37a, an inner ring 37b, and a plurality of rolling elements 37c such as balls.

The outer ring 37a is fixed to the inner peripheral surface of the motor bracket 39 by fitting, for example. Further, the outer ring 37a is fixed to the motor bracket 39 by, for example, the holding plate 37d. Specifically, the outer ring 37a is fixed in the axial direction of the rotating shaft 36 by abutting the pressing plate 37d in the axial direction of the rotating shaft 36. The presser plate 37d is fixed to the motor bracket 39 by a fixing member 37e such as a bolt. On the inner peripheral surface of the outer ring 37a, a raceway surface on which the rolling element 37c moves is formed.

The inner ring 37b is fixed to the rotating shaft 36 by inserting the rotating shaft 36 inside. On the outer peripheral surface of the inner ring 37b, a raceway surface on which the rolling element 37c moves is formed. The plurality of rolling elements 37c are installed between the raceway surface of the outer ring 37a and the raceway surface of the inner ring 37b, and are held by the outer ring 37a and the inner ring 37b.

As shown in FIGS. 1 and 2, the pump 32 has, for example, a suction port 32a and a discharge port 32b on the lower end side. In the pump 32, the suction port 32a is fluidly connected to a water source such as a water receiving tank, and the discharge port 32b is connected to the discharge pipe 40.

The pump 32 is contained in, for example, a casing 32c constituting a suction port 32a and a discharge port 32b, a plurality of intermediate casings arranged on the casing 32c, a casing cover 32d arranged on the intermediate casing, and a plurality of intermediate casings. It includes a plurality of impellers arranged and fixed to the main shaft 33, and a pipe casing 32e provided on the casing cover 32d and covering the plurality of intermediate casings.

The casing cover 32d covers the upper surface of the pump 32, and the motor bracket 39 of the motor 31 is fixed via, for example, a fixing member 32f such as a bolt. Specifically, the motor bracket 39 is placed on the casing cover 32d. The fixing member 32f fixes, for example, the upper part of the casing cover 32d and the lower part of the motor 31.

The pipe casing 32e is provided between the casing 32c and the casing cover, and forms a flow path from the casing cover 32d to the discharge port 32b of the casing 32c between the inner peripheral surface and the outer peripheral surfaces of the plurality of pump casings.

The main shaft 33 is connected to the rotating shaft 36 of the motor 31 via, for example, a shaft joint 33a or the like.
The shaft sealing device 34 shaft seals between the casing cover 32d and the spindle 33. The shaft sealing device 34 is, for example, a mechanical seal.

As shown in FIG. 2, one end of the discharge pipe 40 is connected to the discharge port 32b of each pump 32, and the other end is connected to the connecting pipe 70. The discharge pipe 40 is, for example, at least partially extended along the direction of gravity.

The check valve 50 is provided on the secondary side of the pump 32 and on the primary side of the connecting pipe 70, for example, in each discharge pipe 40. The check valve 50 prevents backflow of water toward the pump 32 in the discharge pipe 40.

The on-off valve 60 is provided, for example, at a position adjacent to the connecting portion between the discharge pipe 40 and the connecting pipe 70. The on-off valve 60 opens or closes a flow path continuous from the discharge pipe 40 to the connecting pipe 70.
As shown in FIGS. 1 and 2, the connecting pipe 70 connects the other ends of the plurality of discharge pipes 40. Further, the connecting pipe 70 is connected to a pipe that communicates with the water supply destination. The connecting pipe 70 merges the water that has passed through each discharge pipe 40 and forms a flow path to the secondary side that communicates with the connected pipe.
As shown in FIG. 1, a plurality of accumulators 90 are provided in the connecting pipe 80, for example. The accumulator 90 is fluidly continuous with the connecting pipe 70 via the connecting pipe 80.

The flow rate detector 100 is provided in each discharge pipe 40, for example, so as to be able to detect the flow rate on the secondary side of each pump 32. The flow rate detector 100 is configured to be able to detect the stop flow rate at which the driving of the pump device 30 is stopped. The flow rate detector 100 is, for example, an impeller type flow rate detector that outputs a signal according to the flow rate. The flow rate detector 100 is electrically connected to the control board 122 via a signal line or the like. The flow rate detector 100 transmits a signal to the control board 122.

The pressure detector 110 is configured to be able to detect the pressure in the connecting pipe 70. The pressure detector 110 is electrically connected to the control board 122 via a signal line or the like. The pressure detector 110 converts the detected pressure into a signal and transmits the signal to the control board 122.

The pump control device 120 includes a box 121, a storage unit 123 housed in the box 121, and a control board 122 which is an example of a control unit housed in the box 121.

The storage unit 123 stores the stop flow rate, the drive pressure, and the program for driving the motor 31.

In the control board 122, the flow rate detector 100 and the pressure detector 110 are electrically connected. The control board 122 controls the pump device 30 based on the detection results of the flow rate detector 100 and the pressure detector 110. For example, when the control board 122 detects the drive pressure by the pressure detector 110, the motor 31 is driven according to the program stored in the storage unit 123, and when the flow rate detector 100 detects the stop flow rate, the drive of the motor 31 is stopped. do. The control board 122 controls, for example, the alternate operation of the plurality of pump devices 30. The alternating operation control is a control in which a plurality of pump devices 30 are driven one by one in order.

Further, the control board 122 is provided with information indicating the operating pump device 30 among the plurality of pump devices 30 and the motor 31 of the operating pump device 30 in the control unit 160 described later of the abnormality detection device 130. Send the rotation speed. Information indicating the operating pump device 30 will be described. Each of the plurality of pump devices 30 is numbered, for example. In this embodiment, three pump devices 30 are used as an example, one pump device 30 is the first machine, the other one pump device 30 is the second machine, and the remaining one pump device 30 is the third machine. Set. In the present embodiment, the information indicating the operating pump device 30 is the unit set in the operating pump device 30.

Further, the control board 122 stores in the storage unit 123 the number of activations and the integrated operation time of each of the plurality of pump 30 devices. Further, the control board 122 transmits to the control unit 160 the number of times the pump device 30 that is operating among the plurality of pump devices 30 is started and the integrated operation time.

As shown in FIG. 3, the abnormality detecting device 130 is a detector 140 configured to be able to detect the vibration of the bearing of the rotating machine used in the water supply device 10 or the sound pressure of the bearing of the rotating machine used in the water supply device 10. The operation data C calculated from the detection results of the storage unit 150, the communication unit 155, and the detector 140 for storing a predetermined predetermined frequency band and threshold value for use in determining the abnormality of the bearing 37, and the initial stage. A control unit 160 for determining an abnormality of the bearing 37 based on a comparison of data F is provided. The abnormality detection device 130 detects, for example, an abnormality in the bearing 37 of the motor 31 included in the pump device 30 which is an example of a rotating machine.

When an abnormality occurs, the bearing 37 vibrates significantly as compared with the normal state. Abnormalities in the bearing 37 include, for example, scratches on the raceway surface of the outer ring 37a, the raceway surface of the inner ring 37b, and at least one of the rolling elements 37c, and foreign matter such as dust invading between the plurality of rolling elements 37c. It is caused by.

The bearing 37 has a scratch on the raceway surface of the outer ring 37a, the raceway surface of the inner ring 37b, and at least one of the rolling elements 37c. It vibrates greatly. The bearing 37 vibrates significantly in the direction parallel to the axial direction of the rotating shaft 36 as compared with the normal state due to the intrusion of foreign matter such as dust between the plurality of rolling elements 37c. The vibration of the bearing 37 is transmitted to the motor bracket 39 to which the bearing 37 is fixed, causing the motor bracket 39 to vibrate.

The vibration of the bearing 37 can be detected directly or indirectly. Directly detecting the vibration of the bearing 37 means detecting the vibration of, for example, the outer ring 37a of the bearing 37. Indirectly detecting the vibration of the bearing 37 means detecting the vibration of a member, for example, the motor bracket 39, in which the vibration of the bearing 37 propagates and vibrates.

To detect the sound pressure of the bearing 37 is to directly or indirectly detect the vibration of air generated by the vibration of the bearing 37. Indirectly detecting the vibration of air generated by the vibration of the bearing 37 means detecting the vibration of air generated by the vibration of other members caused by the vibration of the bearing 37.

In the present embodiment, an example is the configuration in which the detector 140 indirectly detects the vibration of the air due to the vibration of the bearing 37 by detecting the vibration of the air due to the vibration of the motor bracket 39 to which the vibration of the bearing 37 propagates. Used as.

As shown in FIGS. 4 and 5, the detector 140 includes a microphone 141, a substrate 143, a case 142 accommodating the microphone 141 and the substrate 143, and a sealing cover 148 provided on the case 142. The detector 140 outputs the detected value as, for example, an analog signal.

The microphone 141 is configured to be capable of detecting the vibration of air. In the present embodiment, the microphone 141 is configured as a chip as an example, and is mounted on the substrate 143. The microphone 141 has a diaphragm 141b and the like inside the case 141a that constitutes the outer shell. In this case 141a, a hole 141c for propagating the vibration of air is formed in the diaphragm 141b. Hole 141c is a so-called detection hole. The microphone 141 is mounted on the substrate 143 with the holes 141c facing the substrate 143 side. The microphone 141 detects the vibration of air by the vibration of the diaphragm 141b. The microphone 141 outputs a signal according to the detection result.

The substrate 143 is provided with, for example, a capacitor for countermeasures against power supply noise and an amplifier circuit for amplifying the detection result of the microphone 141. The signal line 143b is connected to the substrate 143. Further, the substrate 143 outputs a signal corresponding to the detection result of the microphone 141 via the signal line 143b.

Further, a hole 143a is formed in a portion of the substrate 143 facing the microphone 141. The hole 143a penetrates the substrate 143. The hole 143a faces the diaphragm 141b via the hole 141c of the microphone 141. The hole 141c and the diaphragm 141b of the microphone 141 are arranged, for example, on the axis of the hole 143a. The holes 143a are formed, for example, in holes whose diameter is reduced from the main surface of the substrate 143 opposite to the main surface on which the microphone 141 is mounted toward the main surface on which the microphone 141 is mounted. The inner diameter of one end of the hole 143a on the microphone 141 side is formed to be, for example, the same diameter as or substantially the same diameter as the hole 141c facing the diaphragm 141b in the case of the microphone 141.

The case 142 is fixed at a position in contact with the outer peripheral surface of the motor bracket 39 by, for example, a mounting bracket 144.

The case 142 has a storage space S for accommodating the microphone 141 and the substrate 143 inside. The case 142 includes, for example, a case body 146 and a case cover 147.

The case body 146 forms a storage space S between the case body 146 and the case cover 147. The case body 146 is formed, for example, in the shape of a rectangular box having one side open. For example, a rib 146a is formed on the inner surface of the case body 146. The rib 146a fixes the substrate 143 to the case 142 by sandwiching the substrate 143 between the rib 146a and the case cover 147.

The case cover 147 is provided on the open end surface of the case body 146. The case cover 147 seals between the case cover 147 and the case body 146. The case cover 147 is fixed to the case cover 147 by, for example, a fixing member 147a such as a screw. The case cover 147 is formed with a hole 147b for arranging a part of the sealing cover 148. The hole 147b penetrates the case cover 147 and communicates with the accommodation space S. Further, the holes 147b are aligned with the holes 143a of the substrate 143 in the axial direction thereof.

The sealing cover 148 is provided on the case cover 147. The sealing cover 148 is formed of an elastic body that can be in close contact with a contact object such as the outer peripheral surface of the motor bracket 39. The sealing cover 148 is made of, for example, rubber.

The sealing cover 148 has, for example, a cylindrical main body 148a, which is partially arranged in the hole 147b of the case cover 147, and a flange portion 148b provided in a portion protruding from the hole 147b of the main body 148a to the outside of the case 142.

The main body 148a seals with the inner surface of the hole 147b. The end surface of the main body 148a on the substrate 143 side comes into contact with the other main surface of the substrate 143 on which the microphone 141 is mounted. The main body 148a is formed in a cylindrical shape, for example. The inner diameter of the main body 148a is gradually reduced toward the substrate 143 side.

The main body 148a is arranged coaxially with the hole 143a of the substrate 143. The inner diameter of one end of the main body 148a on the substrate 143 side is formed to be the same diameter as or substantially the same as the inner diameter of the sealing cover 148 side of the hole 143a. In this way, the holes 148d of the main body 148a and the holes 143a of the substrate 143 are continuous with each other.

The flange portion 148b is formed, for example, in an annular shape. The flange portion 148b seals between the flange portion 148b and the case cover 147.

The end surface 148c of the main body 148a and the flange portion 148b on the motor bracket 39 side is configured to be in close contact with the bearing 37 or a member that vibrates in response to the vibration of the bearing 37. In the present embodiment, the end surface 148c is configured as an example of a surface that is in close contact with the outer peripheral surface of the motor bracket 39. When the end surface 148c is pressed against the outer peripheral surface of the motor bracket 39, for example, the end surface 148c is deformed following the outer peripheral surface of the motor bracket 39 and comes into close contact with the outer peripheral surface of the motor bracket 39. The end surface 148c may be formed on a curved surface that follows the contact target, such as the outer peripheral surface of the motor bracket 39.

As described above, in the present embodiment, the holes 148d and the holes 143a form holes extending from the end surface 148c in close contact with the outer peripheral surface of the motor bracket 39 of the sealing cover 148 to the inside of the case 142.

The detector 140 configured in this way extends from the outer peripheral surface of the motor bracket 39 to the diaphragm 141b of the microphone 141 in a state where the end surface 148c of the sealing cover 148 is installed at a position where it is in close contact with the outer peripheral surface of the motor bracket 39. The distance is configured to be less than half the wavelength of the highest response frequency of the microphone 141.

The detector 140 configured in this way is fixed to, for example, the motor bracket 39 by the mounting bracket 144. The motor bracket 39 is an example of the bearing 37 side on the pump 32 side to which the detector 140 is fixed.

As shown in FIG. 5, the mounting bracket 144 is fixed to the motor 31 side to seal the detector 140 in a posture in which the axial directions of the holes 148d and 143a are parallel to the direction orthogonal to the rotation axis 36. The end surface 148c of the cover 148 is brought into close contact with the outer peripheral surface of the motor bracket 39.

As shown in FIG. 4, the mounting bracket 144 is fixed to the casing cover 32d by, for example, a fixing member 32f that fixes the casing cover 32d of the pump 32 to the motor 31. The casing cover 32d is an example on the motor 31 side. The motor 31 side is not limited to the motor 31, and includes a configuration around the motor 31.

The mounting bracket 144 is formed, for example, in an L shape when viewed from the side. Specifically, the mounting bracket 144 has a first portion 144a and a second portion 144b.

The first portion 144a is formed with a hole 144c through which the fixing member 32f is inserted. The detector 140 is fixed to the second portion 144b. As shown in FIG. 5, the detector 140 is fixed to the second portion 144b by, for example, a fixing member 144d such as a screw.

The storage unit 150 is mounted on the same substrate as the control unit 160, and is housed in the box 121, for example. The same board as the control unit 160 is, for example, a board on which the control unit 160 is mounted.

The storage unit 150 is a value used for determining the presence or absence of an abnormality in the bearing 37 in addition to a predetermined frequency band and threshold value determined in advance, and is based on an amplitude spectrum obtained by Fourier transforming the detected value of the detector 140. The initial data F and the operation data C can be stored. Further, the storage unit 150 is configured to be able to store information and values for determining an abnormality of the bearing 37.

Further, the storage unit 150 has a plurality of data tables corresponding to each of the plurality of pump devices 30 of the water supply device 10. In the present embodiment, the storage unit 150 has a first data table corresponding to one of the three pump devices 30, a second data table corresponding to the other one pump device 30, and the remaining one. It has a data table corresponding to the pump device 30.

The initial data F and the operation data C stored based on the detection result of the detector 140 are obtained based on the amplitude spectrum of a predetermined frequency band obtained by Fourier transforming the detection value of the detector 140.

The initial data F and the operation data C are, for example, the maximum peak values of the amplitude spectrum of a predetermined frequency band obtained by Fourier transforming the detected values of the detector 140. The initial data F and the operation data C are calculated by the control unit 160 and stored in the storage unit 150 by the control unit 160. Then, the initial data F and the operation data C are linked to the first data table, the second data table, and the third data table according to the pump device 30 provided with the detector 140.

The initial data F referred to here is a predetermined value among a plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the motor 31 after the water supply device 10 is installed at the installation site. It is the maximum peak value of the amplitude spectrum of a predetermined frequency band obtained by Fourier transforming the detection value of the detector 140 when it is initially driven in the rotation speed range. The initial drive referred to here is, for example, a predetermined first drive after the water supply device 10 is installed at the installation site, or a predetermined plurality of times including the first drive after the water supply device 10 is installed. The predetermined plurality of times referred to here is, for example, two times or three times, and can be arbitrarily determined.

The predetermined rotation speed range may be one or more. The initial data F and the operation data C are stored for each rotation speed range.

For example, when the initial drive is set to one drive, that is, the first drive, the first drive in a predetermined rotation speed range is divided into a plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the motor 31. The maximum peak value of the amplitude spectrum of a predetermined frequency band based on the detection value of the detector 140 at the time of driving is stored in the storage unit 150 as the initial data F.

When a plurality of drives are set as the initial drive, the initial data F compares, for example, the maximum peak values at the time of each of the plurality of initially set drives in a predetermined rotation speed range. This is the largest value obtained. Specifically, when the initial drive is performed a plurality of times, for example, three times including the first time, a predetermined rotation speed range obtained by dividing the motor 31 from the minimum rotation speed to the maximum rotation speed into a plurality of rotation speed ranges. Maximum peak value of the amplitude spectrum of the predetermined frequency band based on the detection value of the detector 140 at the time of the first driving in, and the predetermined frequency band based on the detection value of the detector 140 at the time of the second driving in the predetermined rotation speed range. The maximum peak value of the amplitude spectrum of the predetermined frequency band based on the maximum peak value of the amplitude spectrum of The largest value among the value, the second maximum peak value, and the third maximum peak value is stored in the storage unit 150 as the initial data F.

The operation data C is the drive after the initial drive of the motor 31 in a predetermined rotation speed range among a plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the motor 31, that is, a predetermined rotation speed. It is the maximum peak value of the amplitude spectrum of a predetermined frequency band based on the detection value of the detector 140 when the motor 31 is driven after the initial time in the range and the set number of times, and is updated in the storage unit 150.

For example, when three drives are set as the initial drive, the motor 31 in a predetermined rotation speed range obtained by dividing the motor 31 from the minimum rotation speed to the maximum rotation speed into a plurality of rotation speed ranges. The maximum peak value of the amplitude spectrum in a predetermined frequency band based on the detection value of the detector 140 at the time of the fourth drive is stored as the operation data C. Then, after that, the maximum peak value of the amplitude spectrum in the predetermined frequency band based on the detection value of the detector 140 at the time of the fifth driving in the predetermined rotation speed range of the motor 31 is updated in the storage unit 150 as the operation data C. NS.

The predetermined frequency band referred to here will be described. The predetermined frequency band is a frequency band suitable for detecting an abnormality in the bearing 37. As shown in FIGS. 8 to 10, when an abnormality occurs in the bearing 37, the amplitude spectrum obtained by Fourier transforming the detection value of the detector 140 is compared when the bearing 37 is normal at a specific frequency. It tends to grow larger. As described above, the frequency band suitable for detecting the abnormality of the bearing 37 is the frequency band including the frequency in which the amplitude spectrum becomes large due to the occurrence of the abnormality in the bearing 37. A singular or a plurality of predetermined frequency bands are set. The width of a predetermined frequency band can be arbitrarily set.

When a single frequency band, that is, one frequency band is set as a predetermined frequency band, the predetermined frequency band is, for example, 2500 to 3500 (Hz) in this embodiment.

An example of setting a plurality of predetermined frequency bands will be described. The human audible frequency band is generally 50 to 20 kHz, and the 50 to 2500 Hz band is a band used for human conversation, so it is not so unpleasant for humans. Therefore, as an example of setting a plurality of predetermined frequency bands, a frequency band that is unpleasant for humans is divided into a plurality of frequency bands, and each of these plurality of frequency bands is set as a predetermined frequency band. As a specific example, 2500 to 10 kHz is divided into a plurality of frequency bands, and each frequency band is set as a predetermined frequency band. In each of these plurality of frequency bands, an abnormality occurs in the bearing 37, so that the amplitude spectrum obtained by Fourier transforming the detection of the detector 140 is increased in any of the frequency bands.

Examples of the plurality of frequency bands are a frequency band of 2500 to 3500 (Hz), a frequency band of 3500 to 6000 (Hz), and a frequency band of 6000 to 8500 (Hz). In the present embodiment, a frequency band of 2500 to 3500 (Hz), a frequency band of 3500 to 6000 (Hz), and a frequency band of 6000 to 8500 (Hz) are used as predetermined frequency bands.

Further, an example of dividing the motor 31 from the minimum rotation speed to the maximum rotation speed into a plurality of rotation speed ranges will be described. In the present embodiment, the minimum rotation speed of the motor 31 is, for example, 64 (Hz), and the maximum rotation speed is 75 (Hz). In the present embodiment, as a plurality of rotation speed ranges, as shown in FIG. 6 as an example, the rotation speed range 64 to 66 (Hz), the rotation speed range 66 to 68 (Hz), and the rotation speed range 68 to 70 ( Hz), a rotation speed range of 70 to 72 (Hz), a rotation speed range of 72 to 74 (Hz), and a rotation speed range of 74 to 75 (Hz) are set.

Further, in the present embodiment, these plurality of rotation speed ranges are set as predetermined rotation speed ranges among the plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the motor 31 shown in FIG. That is, as predetermined rotation speed ranges, the rotation speed range 64 to 66 (Hz), the rotation speed range 66 to 68 (Hz), the rotation speed range 68 to 70 (Hz), and the rotation speed range 70 to 72 (Hz). , The rotation speed range 72 to 74 (Hz), and the rotation speed range 74 to 75 (Hz) are set.

The information and values stored in the storage unit 150 used for determining the abnormality of the bearing 37 are used, for example, in a predetermined frequency band suitable for detecting the abnormality of the bearing 37 and for detecting the abnormality of the bearing 37. The threshold value T and the time for detecting the information of the bearing 37 by the detector 140.

The frequency band suitable for detecting the abnormality of the bearing 37 is linked to the data table corresponding to the pump device 30 provided with the detector 140. The frequency bands suitable for detecting the abnormality of the bearing 37 are, for example, a frequency band of 2500 to 3500 (Hz), a frequency band of 3500 to 6000 (Hz), and a frequency band of 6000 to 8500 (Hz). Is.

The threshold value T is used to determine the abnormality of the bearing 37. The abnormal state of the bearing 37 referred to here includes, for example, a pre-alarm state which is a caution level state and an alarm state which requires the drive of the pump device 30 to be stopped. The pre-alarm state is an abnormal state that does not require replacement of the bearing 37. The threshold value T is a value to be compared with the ratio of the operation data C to the initial data F. The threshold value T includes a pre-alarm threshold value T1 for determining the pre-alarm state and an alarm threshold value T2 for determining the alarm state.

The threshold value T is set according to, for example, a predetermined frequency band and a rotation speed range of the motor 31.

For example, for a predetermined frequency band set to 2500 to 3500 (Hz) as a predetermined frequency band, for example, as shown in FIG. 6, a pre-alarm is set in the rotation speed range of 64 to 66 (Hz) of the motor 31. The threshold T1 for alarm is set to 2, and the threshold T2 for alarm is set to 4. In the rotation speed range 66 to 68 (Hz) of the motor 31, the pre-alarm threshold value T1 is set to 2, and the alarm threshold value T2 is set to 4. In the rotation speed range 68 to 70 (Hz) of the motor 31, the pre-alarm threshold value T1 is set to 2, and the alarm threshold value T2 is set to 4. In the rotation speed range 70 to 72 (Hz) of the motor 31, the pre-alarm threshold value T1 is set to 2, and the alarm threshold value T2 is set to 4. In the rotation speed range 72 to 74 (Hz) of the motor 31, the pre-alarm threshold value T1 is set to 3, and the alarm threshold value T2 is set to 6. In the rotation speed range 74 to 75 (Hz) of the motor 31, the pre-alarm threshold value T1 is set to 3, and the alarm threshold value T2 is set to 6.

When a plurality of predetermined frequency bands are set, the threshold value T is set for each of the plurality of predetermined frequency bands in the rotation speed range of the motor 31 as shown in FIG. That is, in the predetermined frequency band set to 3500 to 6000 (Hz), as shown in FIG. 6, the pre-alarm threshold T1 and the alarm threshold T2 suitable for 3500 to 6000 (Hz) are in the rotation speed range of the motor 31. It is set according to. In the predetermined frequency band set to 6000 to 8500 (Hz), as shown in FIG. 6, the pre-alarm threshold T1 and the alarm threshold T2 suitable for 6000 to 8500 (Hz) correspond to the rotation speed range of the motor 31. Is set.

The value of the time for detecting the information of the bearing 37 by the detector 140 is, for example, 3 seconds. That is, when the motor 31 is driven in a predetermined rotation speed range, the detector 140 detects the vibration of the bearing 37 for 3 seconds.

The storage unit 150 configured in this way may have the same configuration as the storage unit included in the pump control device 120 of the pump device 30, for example.

The communication unit 155 is configured to be able to communicate with the pump control device 120 of the pump device 30. Further, the communication unit 155 is configured to be able to communicate with the external device 156. Here, the external device 156 is a device other than the pump device 30. The external device 156 is, for example, a water supply device management server that manages the water supply device 10.

The control unit 160 is housed in, for example, the box 121. The control unit 160 transmits the detection value of the microphone 141 via the signal line 143b. Further, the control unit 160 receives information about the pump device 30 being driven from the control board 122 via the communication unit 155. The information about the driving pump device 30 is the machine number indicating the driving pump device 30 and the rotation speed of the motor 31 of the driving pump device 30.

Further, the control unit 160 receives from the control board 122 via the communication unit 155 the number of times the pump device 30 in operation is started and the integrated operation time of the pump device 30 in operation.

The control unit 160 stores the unit number of the pump device 30 in operation, the rotation speed of the motor 31, the number of starts, and the integrated operation time received from the control board 122 in association with the data table of the pump device 30. Store in unit 150.

Further, the control unit 160 calculates the initial data F and the operation data C from the detected values of the detector 140.

Specifically, the control unit 160 is based on the unit number of the operating pump device 30 transmitted from the pump control device 120 via the communication unit 155 and the rotation speed of the motor 31 of the operating pump device 30. The maximum peak value of the amplitude spectrum of the predetermined frequency band obtained by AD conversion of the detection value for 3 seconds performed by the detector 140 during the initial drive of the motor 31 in the predetermined rotation speed range and then Fourier conversion. The initial data F is obtained based on. Then, the obtained initial data F is stored in the storage unit 150.

Further, the control unit 160 obtains a predetermined value obtained by AD conversion of, for example, a detection value for 3 seconds, which is executed by the detector 140, and then Fourier transform, when the motor 31 is driven in a predetermined rotation speed range after the initial stage. The operation data C is obtained based on the maximum peak value of the amplitude spectrum of the frequency band. Then, the obtained operation data C is stored in the storage unit 150 or updated in the storage unit 150.

Explaining the initial data F, in the present embodiment, the control unit 160 divides the rotation speed range from the minimum rotation speed 64 (Hz) to the maximum rotation speed 75 (Hz) of the motor 31 into six parts. The initial data F of the above is obtained and stored in the storage unit 150.

Specifically, as shown in FIG. 6, the rotation speed range of the motor 31 is 64 to 66 (Hz), the rotation speed range of 66 to 68 (Hz), and the rotation speed range of 68 to 70 (Hz). , 70 to 72 (Hz) rotation speed range, 72 to 74 (Hz) rotation speed range, 74 to 75 (Hz) rotation speed range, each of which is a predetermined frequency band, 2500 to The initial data F of each of 3500 (Hz), 3500 to 6000 (Hz), and 6000 to 8500 (Hz) is obtained and stored in the storage unit 150.

FIG. 6 shows the initial data F in each operating speed range from 2500 to 3000 (Hz). Further, in FIG. 8, for example, the detection result of the detector 140 at the time of initial driving in the rotation speed range of 64 to 66 (Hz) of the motor 31 used for calculating the initial data F is Fourier transformed. The amplitude spectrum of the predetermined frequency band 2500 to 3500 (Hz) obtained is shown. In FIG. 9, for example, the detection result of the detector 140 at the time of initial driving in the rotation speed range of 64 to 66 (Hz) of the motor 31 used for calculating the initial data F is obtained by Fourier transform. An amplitude spectrum of a predetermined frequency band of 3500 to 6000 (Hz) is shown. In FIG. 10, for example, the detection result of the detector 140 at the time of initial driving in the rotation speed range of 64 to 66 (Hz) of the motor 31 used for calculating the initial data F is obtained by Fourier transform. An amplitude spectrum of a predetermined frequency band of 6000 to 8500 (Hz) is shown.

Explaining the operation data C, the control unit 160 divides the rotation speed range from the minimum rotation speed 62 (Hz) to the maximum rotation speed 75 (Hz) of the motor 31 into six parts, and outputs the operation data C in each rotation speed range. It is sought and stored in the storage unit 150.

Specifically, the motor 31 has a rotation speed range of 64 to 66 (Hz), a rotation speed range of 66 to 68 (Hz), a rotation speed range of 68 to 70 (Hz), and a rotation speed range of 70 to 72 (Hz). 2500 to 3500 (Hz), 3500 to 3500 (Hz), which are predetermined frequency bands for each of the rotation speed range of 72 to 74 (Hz) and the rotation speed range of 74 to 75 (Hz). The operation data C of 6000 (Hz) and 6000 to 8500 (Hz) is obtained and stored in the storage unit 150, or updated.

In FIG. 8, for example, the detection result of the detector 140 at the time of driving after the initial stage in the rotation speed range of 64 to 66 (Hz) of the motor 31 used for calculating the operation data C is Fourier transformed. The amplitude spectrum of the obtained predetermined frequency band 2500 to 3500 (Hz) is shown. In FIG. 9, for example, the detection result of the detector 140 at the time of driving after the initial stage in the rotation speed range of 64 to 66 (Hz) of the motor 31 used for calculating the operation data C is Fourier transformed. The amplitude spectrum of the obtained predetermined frequency band 3500 to 6000 (Hz) is shown. In FIG. 10, for example, the detection result of the detector 140 at the time of driving after the initial stage in the rotation speed range of 64 to 66 (Hz) of the motor 31 used for calculating the operation data C is Fourier transformed. The amplitude spectrum of the obtained predetermined frequency band 6000 to 8500 (Hz) is shown.

Further, the control unit 160 is a detector 140 when the motor 31 is driven after the initial stage in each of the rotation speed ranges obtained by dividing the rotation speed range from the minimum rotation speed 64 (Hz) to the maximum rotation speed 75 (Hz) into six. The amplitude spectrum of 2000 to 8500 (Hz), which is an example of the second predetermined frequency band obtained by Fourier transforming the detected value of, is stored or updated in the storage unit 150.

That is, when the control unit 160 obtains the operation data C, first, the detection value of the detector 140 is Fourier transformed to obtain the vibration spectrum of the second predetermined frequency band. The second predetermined frequency band is the same frequency band as the predetermined frequency band. In the present embodiment, a plurality of frequency bands are set as predetermined frequency bands, and as specific examples, frequency bands of 2000 to 35000 (Hz), 3500 to 6000 (Hz), and 6500 to 8000 (Hz) are set. It is set.

The control unit 160 obtains the amplitude spectrum of the second predetermined frequency band obtained by Fourier transforming the detection value of the detector 140, and from this, obtains the amplitude spectrum of the predetermined frequency band included in the second predetermined frequency band. ..

Further, the control unit 160 calculates the ratio R (R = C / F) of the operation data C to the initial data F by using the initial data F and the operation data C in the predetermined frequency band in the predetermined rotation speed range. Then, the control unit 160 compares the ratio R with the threshold value T to determine the abnormality of the bearing 37.

Specifically, the control unit 160 determines that the bearing 37 of the motor 31 is normal when the ratio R is less than the pre-alarm threshold value T1. When the ratio R is equal to or greater than the pre-alarm threshold value T1 and less than or equal to the alarm threshold value T2, the control unit 160 determines that the bearing 37 is in the pre-alarm state. When the ratio R is equal to or higher than the alarm threshold value T2, the control unit 160 determines that the bearing 37 is in the alarm state.

When the control unit 160 has a plurality of predetermined frequency bands, the control unit 160 determines that the ratio R is equal to or more than the pre-alarm threshold value T1 and less than the alarm threshold value T2 in at least one of these plurality of predetermined frequency bands. , It is determined that the bearing 37 is in the pre-alarm state. Further, when the control unit 160 has a plurality of predetermined frequency bands, the bearing 37 is in the alarm state when the ratio R is equal to or higher than the alarm threshold value T2 in at least one of these plurality of predetermined frequency bands. Judge.

When the control unit 160 determines that the bearing 37 is normal, the control unit 160 stores the first information to the fifth information in the storage unit 150, and stores the first to fifth information in the external device 156 via the communication unit 155. Send to.

The first information is the unit number of the pump device 30 including the bearing 37 determined to be normal.
The second information is the operation data C of each predetermined frequency band in the rotation speed range determined to be normal. Here, the operation data C is the strength (dB) of the amplitude spectrum. In the present embodiment, the operation data C is 2500 to 3500 (Hz), the operation data C is 3500 to 6000 (Hz), and the operation data C is 6000 to 8500 (Hz).

The third information is the amplitude spectrum when it is determined to be normal.
The fourth information is the initial data F of each predetermined frequency band in a predetermined rotation speed range determined to be normal. Here, the initial data F is the strength (dB).

Further, when the control unit 160 determines the abnormality of the bearing 37, the control unit 160 transmits the fifth to twelfth information to the external device 156 via the communication unit 155.

The fifth information is the unit number of the pump device 30 having the bearing 37 determined to be abnormal.
The sixth information is the time when the abnormality is determined.
The seventh information is the number of times the motor 31 having the bearing 37 that has determined the abnormality is started.
The eighth information is the integrated operation time of the motor 31 having the bearing 37 that has detected the abnormality.

The ninth information is an amplitude spectrum in a second predetermined frequency band obtained by Fourier transforming the detection value of the detector 140 that has detected the sound pressure of the bearing 37 that has determined the abnormality.

The tenth information is the number of starts of the motor 31 having another normal bearing 37.

The eleventh information is the integrated operation time of the motor 31 having another normal bearing 37.

The twelfth information is an amplitude spectrum for a motor 31 having another normal bearing 37.

Further, when the control unit 160 determines the pre-alarm state, the control unit 160 transmits the fifth to twelfth information to the external device 156 via the communication unit 155 at a predetermined time set in advance. The predetermined time is any time within the working hours of the company or the like in which the external device 156 is installed.

Further, when the control unit 160 determines the alarm state, the control unit 160 immediately transmits the fifth to twelfth information to the external device 156 via the communication unit 155 even if it is outside the above-mentioned predetermined time.

Further, when the control unit 160 determines the alarm state, the control unit 160 stops the drive of the pump device 30 including the motor 31 having the bearing 37 which has determined the abnormality, and further limits the drive to the motor 31. Here, the limitation of driving is to prevent driving. Specifically, the control unit 160 transmits a signal to the control board 122 via the communication unit 155. This signal is a signal that causes the pump control device 120 to stop the motor 31 having the bearing 37 determined to be in the alarm state, and to prevent the motor 31 from driving thereafter. Upon receiving this signal, the control board 122 stops driving the motor 31 including the bearing 37 determined to be in the alarm state, and further prevents the motor 31 from being driven thereafter.

Further, when the control unit 160 determines that the bearing 37 is abnormal, the number of times the motor 31 having the other normal bearing 37 is started, the integrated operating time of the motor 31 having the other normal bearing 37, and the other normal operation time are determined. 6 is an amplitude spectrum of a motor 31 having a bearing 37 in a second predetermined frequency band. The amplitude spectrum for the motor 31 with the other normal bearing 37 is, i.e., the third piece of information.

Further, when the control unit 160 receives the reset signal, the control unit 160 releases the restriction on the motor 31 of the pump device 30 for which the drive is restricted. Specifically, when the control unit 160 receives the reset signal, it transmits a signal for releasing the restriction to the control board 122 via the communication unit 155. When the control board 122 receives a signal from the control unit 160, the control board 122 releases the restriction of the motor 31 whose drive is restricted. The motor 31 whose restriction has been released can be driven.

The reset signal is set for each motor 31, for example. That is, when the control unit 160 receives the reset signal for the pump device 30 of the first unit, it transmits a signal for releasing the restriction on the driving of the motor 31 of the pump device 30 of the first unit. When the control unit 160 receives the reset signal for the pump device 30 of the second unit, the control unit 160 transmits a signal for releasing the restriction on the driving of the motor 31 of the pump device 30 of the second unit.

Further, when the control unit 160 receives the signal for deleting the initial data, the control unit 160 deletes the initial data F of the bearing 37 from the storage unit 150.

The signal for deleting the initial data F is set for each motor 31. That is, when the control unit 160 receives the signal for deleting the initial data F of the bearing 37 of the pump device 30 of the first unit, the control unit 160 deletes the initial data F of the bearing 37 of the pump device 30 of the first unit from the storage unit 150. When the control unit 160 receives the signal for deleting the initial data F of the bearing 37 of the pump device 30 of the second unit, the control unit 160 deletes the initial data F of the bearing 37 of the pump device 30 of the second unit from the storage unit 150.

The control unit 160 may be provided with an operation unit 180 for transmitting a reset signal and a deletion signal of the initial data F. The operation unit 180 may be provided in the box 121, for example. The operation unit 180 is electrically connected to the control unit 160, and when operated, the operation unit 180 transmits a reset signal and a deletion signal of the initial data F to the control unit 160. Specifically, the operation unit 180 includes an operation unit for transmitting a reset signal and an operation unit for transmitting a signal for deleting the initial data F provided for each pump device 30.

Alternatively, a receiving unit for receiving the reset signal and the deletion signal transmitted from an external device such as a remote controller may be provided. This receiving unit may be provided in the box 121, for example. The receiving unit referred to here may be configured to receive a signal transmitted wirelessly, or may be a connecting unit to which a signal line of an external device is connected. When the control unit 160 receives the reset signal from the operation unit 180 or an external device such as a remote controller, the control unit 160 transmits a release signal to the control board 122 via the communication unit 155. Further, when the control unit 160 receives the deletion signal from the operation unit 180 or an external device such as a remote controller, the control unit 160 deletes the initial data F stored in the storage unit 150.

After deleting the initial data F stored in the storage unit 150, the control unit 160 divides the motor 31 from the minimum rotation speed to the maximum rotation speed into a plurality of rotation speed ranges, and in a predetermined rotation speed range, the motor Initial data F is obtained based on the amplitude spectrum of a predetermined frequency band obtained by Fourier transforming the detection value of the detector 140 when the detector 140 is driven the same number of times as the initial stage of 31, and is stored in the storage unit 150.

That is, after the initial data F is deleted, the control unit 160 obtains the initial data F when the water supply device 10 is installed at the installation site and then driven at the initial stage of the motor 31. The data F is obtained and stored in the storage unit 150.

Further, when the control unit 160 determines an abnormality in the bearing 37 of the motor 31 of any of the plurality of pump devices 30, the control unit 160 detects the sound pressure of the bearing 37 of the motor 31 of the other pump device 30 based on the detector 140. The fifth to twelfth information is transmitted to the external device 156 via the communication unit 155.

Next, an example of the operation of the abnormality detection device 130 will be described with reference to FIG. 7.
In the present embodiment, as an example, the water supply device 10 drives a plurality of pump devices 30 by alternating operations. When the bearing 37 vibrates due to the drive of the motor 31, the vibration of the bearing 37 is transmitted to the motor bracket 39. The vibration of the motor bracket 39 vibrates the air in the hole 148d of the case 142 of the detector 140 and the hole 143a of the substrate 143. The vibration of the air in the holes 148d and 143a is transmitted to the diaphragm 141b of the microphone 141. The microphone 141 detects the vibration of air by detecting the vibration of the diaphragm 141b. The detector 140 transmits the detected value to the control unit 160.

As shown in FIG. 7, the control unit 160 acquires information about the pump device 30 driven from the control board 122 (step ST1). The information of the pump device 30 is the machine number of the pump device 30, the rotation speed of the motor 31, the number of times the motor 31 is started, and the integrated operation time of the motor 31. The control unit 160 stores the acquired information in the storage unit 150.

Next, based on the acquired information, the control unit 160 stores in the storage unit 150 the initial data F of the operating motor 31 in a predetermined rotation speed range including the rotation speed of the motor 31. It is determined whether or not (step ST2).

When the motor 31 is first driven in each of a plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed, the initial data F is not stored in the storage unit 150. When the control unit 160 determines that the initial data F is not stored in the storage unit 150 (NO in step ST2), the control unit 160 calculates the initial data F based on the signal from the detector 140 (step ST3), and operates. It is linked to the data table of the pump device 30 and stored in the storage unit 150 (step ST4). When the control unit 160 stores the initial data F in the storage unit 150, the control unit 160 returns to step ST1.

When the control unit 160 determines that the initial data F is stored in the storage unit 150 (YES in step ST2), the control unit 160 calculates the operation data C based on the signal from the detector 140 (step ST5), and stores the storage unit 160. Store in 150 (step ST6). If the operation data C is already stored, the control unit 160 updates it. Further, the control unit 160 stores the first to fourth information in the storage unit 150.

Next, the control unit 160 calculates the ratio R (R = C / F) of the operation data C to the initial data F, and compares the ratio R with the threshold value T. Specifically, the control unit 160 determines whether or not the ratio R is less than the pre-alarm threshold value T1 (step ST7). When the control unit 160 determines that the ratio R is less than the pre-alarm threshold value T1 (YES in step ST7), the control unit 160 transmits the first to fourth information stored in the storage unit 150 to the external device via the communication unit 155. It is transmitted to 156 (step ST8). When the control unit 160 transmits the first to fourth information, the control unit 160 returns to step ST1. FIG. 11 shows, for example, the first to fourth information of the pump device 30 set in the first unit as the operation unit.

The control unit 160 determines that the ratio R is equal to or greater than the pre-alarm threshold T1 (NO in step ST7), and then determines whether or not the ratio R is less than or equal to the alarm threshold T2 (step ST9). When the ratio R is less than the alarm threshold value T2 (YES in step ST9), the control unit 160 determines that the motor 31 is in the pre-alarm state (step ST10). When the control unit 160 determines that it is in the pre-alarm state, it transmits the fourth to twelfth information to the external device 156 via the communication unit 155 at a predetermined time (step ST11).

When the ratio R is equal to or higher than the alarm threshold value T2 (NO in step ST9), the control unit 160 determines that the motor 31 is in the alarm state (step ST12). When the control unit 160 determines that the motor 31 is in the alarm state, the control unit 160 then transmits a signal for stopping the motor 31 determined to be in the alarm state to the control board 122 via the communication unit 155, and the motor 31 To stop. Further, the control unit 160 transmits a signal to the control board 122 via the communication unit 155 so that the motor 31 determined to be in the alarm state is not driven after the determination (step ST13).

Next, the control unit 160 transmits the fifth to twelfth information to the external device 156 via the communication unit 155 (step ST14). When the control unit 160 transmits the fifth to twelfth information, the control unit 160 returns to step ST1.

Further, when the control unit 160 receives the reset signal, the control unit 160 releases the drive restriction on the motor 31. Specifically, when the control unit 160 receives the reset signal set for each motor 31, the control unit 160 transmits a signal for releasing the restriction of the motor 31 corresponding to the received signal to the control board 122 via the communication unit 155. do.

Further, when the control unit 160 receives the signal for deleting the initial data, the control unit 160 deletes the initial data F of the bearing 37 from the storage unit 150. Specifically, when the control unit 160 receives a signal for deleting the initial data set for each motor 31, the control unit 160 deletes the initial data of the motor 31 with respect to the received signal.

According to the detector 140 configured in this way, after the water supply device 10 is installed at the installation site, a predetermined rotation within a plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the motor 31 is divided. The maximum spectrum value of the amplitude spectrum of a predetermined frequency band obtained by AD conversion and then Fourier transform of the detection value of the detector 140 when initially driven in each of the speed ranges is stored in the storage unit 150 as initial data F. , The maximum spectrum value at the time of driving after the initial stage is stored in the storage unit 150 as the operation data C, and the ratio R of the operation data C to the initial data F is calculated. Then, when the ratio R is equal to or less than the pre-alarm threshold value T1, the control unit 160 determines that the pump device 30 is normal. Then, when the control unit 160 determines that the pump device 30 is normal, the control unit 160 transmits the first to fourth information to the pump control device 120 via the communication unit 155.

In this way, the initial data F and the operation data are based on the maximum spectrum value of the amplitude spectrum of the predetermined frequency band obtained by Fourier transforming the value detected by the detector 140 when the water supply device 10 is installed at the installation site. By obtaining and storing C, the installation conditions of the water supply device 10 when the initial data F is stored in the storage unit 150 and the installation conditions of the water supply device 10 when the operation data C is stored in the storage unit 150 are the same. Therefore, the installation conditions of the water supply device 10 do not affect the determination of the abnormality of the bearing 37. Therefore, the accuracy of abnormality determination of the bearing 37 can be improved.

Further, by using the maximum peak value of the amplitude spectrum of the predetermined frequency band including the frequency at which the amplitude changes when the bearing 37 has an abnormality as the initial data F and the operation data C, the abnormality of the bearing 37 can be detected. The accuracy can be improved.

Further, when the control unit 160 determines that the pump device 30 is normal, the first is based on the amplitude spectrum obtained by Fourier transforming the detection value of the detector 140 in the predetermined rotation speed range when the pump device 30 is determined to be normal. The first to fourth information is transmitted to the external device 156 via the communication unit 155.

Therefore, it is possible to periodically obtain the first to fourth information of the bearing 37 of the pump device 30. As a result, the periodic inspection work of the bearing 37 by the worker becomes unnecessary. Further, the first to fifth information can be used as information to be described in various reports concerning the water supply device 10, for example.

Further, when the control unit 160 determines the abnormality of the bearing 37, the control unit 160 transmits the fifth to twelfth information to the external device 156 via the communication unit 155. Therefore, the management destination that manages the water supply device 10 can grasp the abnormality of the bearing 37. Furthermore, it becomes possible to obtain information on other normal bearings 37. By simultaneously obtaining information on a normal bearing 37, for example, it is possible to detect a bearing 37 that is likely to be in a pre-alarm state in the near future even if it is normal. If there is a bearing 37 that is likely to be in the pre-alarm state in the near future, the bearing 37 that is determined to be abnormal can be replaced at the same time, and the bearing 37 that is likely to be in the pre-alarm state in the near future can be replaced. It is possible to reduce the number of replacement operations of 37.

Further, when the control unit 160 determines the pre-ram state as an abnormality of the pump device 30, the control unit 160 transmits the fifth to twelfth information to the external device 156 via the communication unit 155. In this way, since the sixth to tenth information can be obtained in the pre-alarm state, the worker should secure sufficient time for preparation for the alarm state that is expected to occur thereafter. Is possible.

Further, when the control unit 160 determines the abnormality, the control unit 160 transmits the fifth to twelfth information to the external device 156 via the communication unit 155 during the working hours of the company or the like in which the external device 156 is installed. Therefore, the person in charge of the company or the like in which the external device 156 is installed can confirm the fifth to twelfth information transmitted from the communication unit 155 during working hours. If the company or the like where the external device 156 is installed is different from the company or the like which manages the water supply device 10, the person in charge of the company or the like where the external device 156 is installed manages the water supply device 10 during working hours. It is possible to report that an abnormality has occurred in the bearing 37 to the company or the like.

Further, when the control unit 160 determines the alarm state as an abnormality of the bearing 37, the control unit 160 limits the driving of the pump device 30 having the bearing 37 determined to be in the alarm state. Therefore, it is possible to prevent the water supply device 10 from failing.

Further, the control unit 160 releases the drive restriction on the motor 31 by receiving the reset signal. Therefore, when vibration or sound pressure is reconfirmed with respect to the pump device 30 determined to be in the alarm state, the confirmation can be performed by transmitting a reset signal.

Further, when the control unit 160 receives the deletion signal of the initial data, the control unit 160 deletes the initial data F stored in the storage unit 150. Therefore, for example, even when the motor 31 and the bearing 37 of the water supply device 10 are replaced, the initial data F and the operation data C corresponding to the bearing 37 of the pump device 30 after the replacement are stored in the storage unit 150 again. It becomes possible to memorize.

Further, when the control unit 160 determines the alarm state as an abnormality of the bearing 37, the control unit 160 immediately transmits the first to fourth information to the external device 156 via the communication unit 155.

Therefore, the person in charge of the company or the like in which the external device 156 is installed can grasp the abnormality requiring the stop of the drive of the pump device 30 immediately after the occurrence of the abnormality.

Further, when the control unit 160 determines an abnormality in the bearing 37 of the pump device 30 among the plurality of pump devices 30, the storage unit 150 of the bearing 37 included in the pump device 30 other than the one for which the abnormality is determined is determined. The tenth to twelfth information stored in the above is transmitted to the external device 156 via the communication unit 155. Therefore, the management destination of the water supply device 10 can grasp the state of the bearing 37 from the tenth to twelfth information even for the pump device 30 including the bearing 37 which is normal. Therefore, for example, even if the bearing 37 is still normal, if it can be determined that it will be in the pre-alarm state or the alarm state, it is possible to perform the repair work at the same time, and the repair work of the water supply device 10 can be performed. It is possible to reduce the number of times.

Further, a threshold value T corresponding to the rotation speed range of the motor 31 and a predetermined frequency band is used. Specifically, when the rotation speed range of the motor 31 is 64 to 72 (Hz), the threshold value T is 1.4, and when the rotation speed range of the motor 31 is 72 to 75, the threshold value T is 2. By using the threshold value T according to the rotation speed range of the motor 31 in this way, the accuracy of determining the abnormality of the bearing 37 can be improved.

Further, the control unit 160 detects the vibration of the bearing 37 of the driving motor 31 when only one of the motors 31 of the plurality of pumping devices 30 included in the water supply device 10 is being driven. Since it is not necessary to provide the control unit 160 for each of the plurality of detectors 140 by determining the abnormality of the bearing 37 from the detection value of 140, the manufacturing cost of the abnormality detection device 130 can be reduced. Note that the fact that only one motor 31 is driven means that the motors are operating independently.

Further, the control unit 160 sets the range from the minimum rotation speed to the maximum rotation speed of the motor 31 into a plurality of rotation speed ranges as a predetermined rotation speed range, and the detector 140 in each of the plurality of rotation speed ranges. Initial data F and operation data C were obtained based on the detection result of. That is, the control unit 160 also determined the abnormality based on the detection result of the detector 140 at the rotation speed near the minimum rotation speed, which is the rotation speed at which the flow rate detector 100 detects the stop flow rate. In other words, the control unit 160 detects the sound pressure by the detector 140 when the flow rate reaches the stop flow rate. At a rotation speed near the minimum rotation speed, which is the rotation speed at which the flow rate detector 100 detects the stopped flow rate, the operating noise of the motor 31 becomes relatively quiet, so that it becomes easy to determine an abnormality in the bearing 37.

Therefore, by determining the abnormality of the bearing 37 based on the detection result of the detector 140 when the stop flow rate is detected, the accuracy of determining the abnormality of the bearing 37 can be improved.

As described above, according to the water supply device 10 according to the embodiment of the present invention, it is possible to provide an abnormality detection device that can provide information used for determining an abnormality of a bearing.

In the above example, the configuration in which the abnormality detection device 130 detects the sound pressure of the bearing 37 by the detector 140 has been described as an example, but the present invention is not limited to this. In another example, the configuration may be such that the vibration of the bearing 37 is detected. In this case, the abnormality detection device 130 uses a detector that detects the vibration of the bearing 37 instead of the detector 140.

Further, in the above example, a configuration in which the water supply device 10 includes three pump devices 30 as an example of a plurality of units and the pump control device 120 operates the plurality of pump devices 30 by alternating operation control has been described as an example. However, it is not limited to this. In another example, the pump control device 120 may control a plurality of pump devices 30 by parallel operation control in which two or more pump devices 30 are simultaneously driven. The abnormality detection device 130 determines the abnormality of the bearing 37 in a state where only one pump device 30 is driven, and is not affected by the vibration and noise of other motors 31. Therefore, the bearing is accurately detected. Further, since it is not necessary to provide the control unit 160 for each detector 140, the manufacturing cost of the abnormality detection device 130 can be reduced.

Alternatively, in the case where the pump control device 120 controls a plurality of pump devices 30 by parallel operation control, the abnormality detection device 130 operates at the highest frequency among the plurality of pump devices 30 operating at the same time. Based on the detection result of the detector 140 provided in the pump device 30, the abnormality of the bearing 37 may be determined.

The parallel operation referred to here is an operation in which at least one of the plurality of pump devices 30 performs a constant speed operation at the highest frequency, and the other one performs a speed change operation. Further, the operation having the highest frequency referred to here means that the frequency of the AC voltage supplied to the motor 31 is the highest frequency.

Further, in the above example, the range from the minimum rotation speed to the maximum rotation speed of the motor 31 is divided into a plurality of rotation speed ranges, and the detector 140 in each of the plurality of rotation speed ranges is set as a predetermined rotation speed range. The configuration for obtaining the initial data F and the operation data C based on the detection result of is described as an example, but the present invention is not limited to this. In another example, as the predetermined rotation speed range, a rotation speed range in which an abnormality of the bearing 37 can be easily determined may be used. An example of this predetermined rotation speed range is a rotation speed range including a rotation speed near the minimum rotation speed, which is a stop flow rate.

Further, in the above example, once for each drive of the pump device 30, detection is performed by the detector 140 for a preset time, for example, 3 seconds, and the detection result is Fourier transformed to obtain initial data F or operation data C. However, it is not limited to this. In another example, for example, the initial data F and the operation data C may be obtained by detecting the pump device 30 a plurality of times each time the pump device 30 is driven and using the maximum peak value obtained from each detection result. ..

That is, the control unit 160 detects a plurality of maximum peak values at each predetermined number of times of driving set as the initial time, compares all the maximum peak values obtained by the predetermined number of times of driving, and compares the maximum maximum values. The peak value is stored as the initial data F.

Similarly, a plurality of maximum peak values may be detected for each drive time after the initial stage, and the largest maximum peak value among these maximum peaks may be stored as operation data C.

In the case of this configuration, the storage unit 150 stores the timing of detection by the detector 140, the time for detecting the information of the bearing 37 by the detector 140, and the number of times of detection in one drive. The timing of detection by the detector 140 is, for example, every 10 seconds. The time for detecting the information of the bearing 37 by the detector 140 is, for example, 3 seconds. That is, the detector 140 detects the vibration of the bearing 37 every 10 seconds for 3 seconds, and detects a total of a plurality of preset times.

For example, when the number of detections for each drive is set to 2 times as an example of a plurality of times and 2 times is set as the initial drive, the first predetermined rotation speed range as the initial drive of the motor 31 Is driven, the detector 140 first detects for 3 seconds, the detection result is Fourier transformed to obtain the maximum peak value in a predetermined frequency band, and the second detection is performed by the detector 140 10 seconds after the previous detection. Then, the detection result is Fourier transformed to obtain the maximum peak value in a predetermined frequency band. Then, the maximum peak value obtained by the first detection in the predetermined frequency band and the two maximum peak values obtained by the second detection are compared, and a larger maximum peak value is driven by the first initial drive of the motor 31. The maximum peak value of the hour.

Similarly, during the second drive in the predetermined speed range as the initial drive of the motor 31, two maximum peak values are detected, these two maximum peak values are compared, and a larger maximum peak value is obtained by the motor. It is set to the maximum peak value at the time of the second initial drive of 31.

Then, the maximum peak value at the initial stage of the first time and the maximum peak value at the initial stage of the second time are compared, and a larger maximum peak value is stored as the initial data F.

Further, the control unit 160 detects the sound pressure by one of the plurality of detectors 140 while all the operations of the plurality of pump devices 30 are stopped, and the amplitude of the predetermined frequency band. The spectrum is obtained, and the background noise data based on this amplitude spectrum is obtained.

Here, the predetermined frequency band is the predetermined frequency band used to detect the initial data F and the operation data C. The background noise data is, for example, the maximum peak value in a predetermined frequency band. That is, the background noise data is a value detected in the same manner as the operation data C. Further, one detector 140 for obtaining background noise data is determined in advance, for example. In addition, one detector 140 for obtaining background noise data may be appropriately determined.

The control unit 160 compares the background noise data with the initial data F. Here, the pump device 30 having the initial data F to be compared with the background noise data is, for example, the pump device 30 having the detector 140 that has detected the background noise data. Further, the initial data F to be compared with the background noise data is the smallest initial data F among the initial data Fs in the predetermined rotation speed range of the motor 31 of the pump device 30 including the detector 140 that detects the background noise data. It is F. Here, the predetermined rotation speed range is a predetermined rotation speed range used when detecting the initial data F and the operation data C. In the present embodiment, the rotation speed range from the minimum rotation speed to the maximum rotation speed of the motor 31 is the entire rotation speed range among the plurality of rotation speed ranges.

The control unit 160 compares the background noise data with the smallest value of the initial data F of each initial data F in the predetermined rotation speed range of the motor 31 of the pump device 30 having the detector 140 that detects the background noise data. It is determined whether or not the noise data is lower than the initial data F by a predetermined constant value or more. That is, the control unit 160 determines whether or not the value of the difference obtained by subtracting the background noise data from the initial data F is equal to or higher than a predetermined constant value.

If the value of the difference obtained by subtracting the background noise data from the initial data F is equal to or more than a predetermined constant value, the control unit 160 does not detect the sound pressure thereafter. That is, the detection of sound pressure is stopped. Here, the predetermined constant value is a value at which it can be determined that the background noise does not affect the determination of the abnormality of the plurality of pump devices 30, and is determined in advance. For example, a predetermined constant value may be set as a threshold value capable of determining whether or not a rotating machine other than the pump device 30 is driven. In this case, the control unit 160 can determine that the rotating machine other than the pump device 30 is not driven when the value of the difference obtained by subtracting the background noise data from the initial data F is a predetermined constant value or more. Further, if the subsequent sound pressure is not detected, the detector 140 does not detect the sound pressure of the driving pump device 30 while any of the plurality of pump devices 30 is being driven. That's what it means.

Further, the control unit 160 determines that the value of the difference obtained by subtracting the background noise data from the initial data F is equal to or more than a predetermined constant value and does not detect the sound pressure of the pump device 30 thereafter. When all the operations of the plurality of pump devices 30 are stopped, background noise data is detected again. Then, this background noise data is compared with the smallest value of each initial data F in a predetermined rotation speed range. Then, when the value of the difference obtained by subtracting the background noise data from the initial data F is less than a predetermined constant value, the control unit 160 restarts the subsequent detection of the sound pressure. If the value of the difference obtained by subtracting the background noise data from the initial data F is equal to or more than a predetermined constant value, the control unit 160 does not detect the sound pressure thereafter.

That is, when sound pressure is detected by the detector 140 while another rotating machine, for example, a compressor, is operating in the machine room in which a plurality of pump devices 30 are installed, the operating sound of the other rotating machine is detected. Becomes external noise. Therefore, while all the pump devices 30 are stopped, the external noise is measured by one of the detectors 140 to detect the background noise data, and the background noise data is the initial data of each of the predetermined rotation speed ranges. When the sound pressure does not fall below a predetermined constant value, for example, 10 dB or more from F, it is decided not to perform the subsequent sound pressure detection, and the operation number and the rotation speed value are not transmitted.

That is, the control unit 160 determines that the value of the difference obtained by subtracting the background noise data from the initial data F is equal to or higher than a predetermined constant value, and thus the external noise affects the determination of the abnormality of the motor 31. , The subsequent sound pressure is not detected.

This makes it possible to detect abnormalities in the bearing without being affected by external noise. For example, if a predetermined constant value is set to a value that can determine whether or not a rotating machine other than the pump device 30 is driven, the detector 140 detects the sound pressure during a time when the other rotating machines are not operating. As a result, it is possible to detect abnormalities in the bearing without being affected by external noise.

For 10 dB, which is an example of the above-mentioned predetermined constant value, the maximum peak value of background noise is the peak of the initial data according to "Correction of the influence of background noise" of JIS Z 8731 "Display / measurement method of environmental noise". If it is 10 dB or more lower than the value, it is based on the judgment that the operation data is not affected by background noise. The predetermined constant value is not limited to 10 dB. The predetermined constant value can be appropriately set according to the environment of the installation site where the plurality of pump devices 30 are installed.

Further, in the above example, all of the plurality of rotation speed ranges are set as an example of a predetermined rotation speed range in which the minimum rotation speed to the maximum rotation speed of the rotating machine is divided into a plurality of rotation speed ranges. Specifically, as predetermined rotation speed ranges, a rotation speed range of 64 to 66 (Hz), a rotation speed range of 66 to 68 (Hz), a rotation speed range of 68 to 70 (Hz), and a rotation speed range of 70 to 70 to 72 (Hz), a rotation speed range 72 to 74 (Hz), and a rotation speed range 74 to 75 (Hz) were set.

However, it is not limited to this. A part of a plurality of rotation speed ranges may be set as a predetermined rotation speed range.

The present invention is not limited to the above embodiment, and can be variously modified at the implementation stage without departing from the gist thereof. In addition, each embodiment may be carried out in combination as appropriate, and in that case, the combined effect can be obtained. Further, the above-described embodiment includes various inventions, and various inventions can be extracted by a combination selected from a plurality of disclosed constituent requirements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the problem can be solved and the effect is obtained, the configuration in which the constituent requirements are deleted can be extracted as an invention.

10 ... Water supply device, 30 ... Pump device, 31 ... Motor, 32 ... Pump, 36 ... Rotating shaft, 37 ... Bearing, 37a ... Outer ring, 37b ... Inner ring, 37c ... Rolling element, 130 ... Abnormality detector, 140 ... Detector , 150 ... storage unit, 160 ... control unit, 170 ... sensor.

The abnormality detection device according to the embodiment of the present invention includes a detector for detecting vibration or sound pressure of the bearing of a rotating machine including a rotating shaft and a bearing supporting the rotating shaft, and a threshold for determining an abnormality. After the rotating machine is installed at the installation site, the storage unit that stores the above, the communication unit that communicates with the external device, and the rotation speed range from the minimum rotation speed to the maximum rotation speed of the rotation machine are divided into a plurality of rotation speed ranges. The detection value of the detector at the time of initial driving in a predetermined rotation speed range is Fourier-transformed to obtain an amplitude spectrum in a predetermined frequency band, and initial data based on this amplitude spectrum is stored in the storage unit. The detection value of the detector at the time of driving the rotating machine after the initial stage in the predetermined rotation speed range is Fourier-converted to obtain the amplitude spectrum of the predetermined frequency band, and the operation data based on the amplitude spectrum is stored in the storage unit. When the ratio of the operation data to the initial data is calculated and the bearing is determined to be normal based on the ratio and the threshold value, the external device is provided with the predetermined rotation speed range via the communication unit. A control unit for transmitting information on an amplitude spectrum obtained by Fourier transforming the detection value of the detector in the above. The control unit obtains the amplitude spectrum a plurality of times for each predetermined number of times of driving set as the initial stage, compares the maximum peak values of the plurality of amplitude spectra obtained at the predetermined number of times, and obtains the largest value. It is stored in the storage unit as initial data, the amplitude spectrum is obtained for each drive after the initial stage, and the maximum peak value of the obtained amplitude spectrum value is stored in the storage unit as the operation data.

Control unit 160, the value of the difference obtained by subtracting the background noise data from the initial data F is, if it is a predetermined constant value or more, to detect a subsequent sound pressure. That is, the detection of sound pressure is not stopped. Here, the predetermined constant value is a value at which it can be determined that the background noise does not affect the determination of the abnormality of the plurality of pump devices 30, and is determined in advance. For example, a predetermined constant value may be set as a threshold value capable of determining whether or not a rotating machine other than the pump device 30 is driven. In this case, the control unit 160 can determine that the rotating machine other than the pump device 30 is not driven when the value of the difference obtained by subtracting the background noise data from the initial data F is a predetermined constant value or more. Further, if the subsequent sound pressure is not detected, the detector 140 does not detect the sound pressure of the driving pump device 30 while any of the plurality of pump devices 30 is being driven. That's what it means.

The control unit 160, the value of the difference obtained by subtracting the background noise data from the initial data F is is a predetermined constant value or more, since it is determined that the detection of the sound pressure of the subsequent pump device 30, then When all the operations of the plurality of pump devices 30 are stopped, background noise data is detected again. Then, this background noise data is compared with the smallest value of each initial data F in a predetermined rotation speed range. Then, if the value of the difference obtained by subtracting the background noise data from the initial data F is less than a predetermined constant value, the control unit 160 does not restart the detection of the sound pressure after that. Control unit 160, the value of the difference obtained by subtracting the background noise data from the initial data F is, if it is a predetermined constant value or more, to detect a subsequent sound pressure.

That is, the control unit 160 determines that the value of the difference obtained by subtracting the background noise data from the initial data F is equal to or greater than a predetermined constant value, so that the external noise does not affect the determination of the abnormality of the motor 31. Te, the detection of the subsequent sound pressure.

The present invention is not limited to the above embodiment, and can be variously modified at the implementation stage without departing from the gist thereof. In addition, each embodiment may be carried out in combination as appropriate, and in that case, the combined effect can be obtained. Further, the above-described embodiment includes various inventions, and various inventions can be extracted by a combination selected from a plurality of disclosed constituent requirements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the problem can be solved and the effect is obtained, the configuration in which the constituent requirements are deleted can be extracted as an invention.
The following is a description equivalent to the invention described in the claims of the original application of the present application.
[1]
A detector that detects vibration or sound pressure of a rotating shaft and a bearing that supports the rotating shaft of a rotating machine.
A storage unit that stores a threshold value for determining an abnormality,
Communication unit that communicates with external devices
After the rotating machine is installed at the installation site, the detection at the time of initial driving in a predetermined rotation speed range among a plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the rotating machine. The detection value of the device is Fourier transformed to obtain an amplitude spectrum in a predetermined frequency band, initial data based on this amplitude spectrum is stored in the storage unit, and the rotating machine is driven in the predetermined rotation speed range after the initial stage. The detection value of the detector at the time is Fourier transformed to obtain the amplitude spectrum of the predetermined frequency band, the operation data based on the amplitude spectrum is stored in the storage unit, and the ratio of the operation data to the initial data is calculated. When it is determined that the bearing is normal based on the ratio and the threshold value, the amplitude obtained by Fourier transforming the detection value of the detector in the predetermined rotational speed range to the external device via the communication unit. A control unit that transmits spectrum information and
Anomaly detection device comprising.
[2]
The control unit obtains the amplitude spectrum a plurality of times for each predetermined number of times of driving set as the initial stage, compares the maximum peak values of the plurality of amplitude spectra obtained at the predetermined number of times, and obtains the largest value. The storage unit is stored as initial data, and the amplitude spectrum is obtained for each drive after the initial stage, and the maximum peak value of the obtained amplitude spectrum value is stored in the storage unit as the operation data, according to [1]. Abnormality detection device.
[3]
When the control unit determines that an abnormality has occurred in the bearing based on the ratio and the threshold value, the control unit determines the time at which the abnormality is determined, the number of times the rotating machine is started, the integrated operation time of the rotating machine, and the abnormality. The abnormality detection device according to [1], wherein the information of the amplitude spectrum obtained by Fourier transforming the detection value of the detector in a predetermined rotation speed range is transmitted to the external device by the communication unit.
[4]
The control unit tells the external device by the communication unit that the time when the abnormality is determined, the number of times the rotating machine is started, the integrated operation time of the rotating machine, and the predetermined rotation speed range in which the abnormality is determined. The abnormality detection device according to [3], which transmits the information of the amplitude spectrum obtained by Fourier transforming the detection value of the detector at a predetermined time set in advance.
[5]
The abnormality is an abnormality that requires the rotating machine to be stopped.
When the control unit determines an abnormality, the control unit limits the drive of the rotating machine.
The abnormality detection device according to [3].
[6]
The abnormality includes a first abnormality capable of continuing the operation of the rotating machine and a second abnormality requiring the rotating machine to be stopped.
The threshold value includes a first threshold value for determining the first abnormality and a second threshold value for determining the second abnormality.
The control unit determines that the ratio of the operation data to the initial data is less than the first threshold value, and determines that the ratio of the operation data to the initial data is equal to or more than the first threshold value and the first threshold value or more. If it is less than the threshold value of 2, it is determined as the first abnormality, and if the ratio of the operation data to the initial data is equal to or more than the second threshold value, it is determined as the second abnormality and the rotating machine is driven. When the restriction is applied and the reset signal is received, the restriction of the rotating machine is released, and when the request signal for deleting the initial data is received, the initial data stored in the storage unit is deleted. The described anomaly detector.
[7]
A plurality of the rotary machines are provided.
A plurality of the detectors are provided to detect the vibration or sound pressure of the bearing of each of the plurality of rotating machines.
When the control unit determines an abnormality in any of the bearings of the plurality of bearings based on the detection results of the plurality of detectors, the number of times the other rotating machine is started, the number of times the other rotary machine is started, and the like, which are stored in the storage unit. The communication unit transfers the integrated operating time of the rotating machine and the amplitude spectrum obtained by Fourier transforming the detection values of the detector in the predetermined rotation speed range of the rotating machine to the external device. Send,
The abnormality detection device according to [1].
[8]
A plurality of the detectors are provided to detect the vibration or sound pressure of the bearing of each of the plurality of rotating machines.
The control unit detects vibration or sound pressure of the bearing of the rotating machine that is operating independently among the plurality of rotating machines.
The abnormality detection device according to [1].
[9]
The rotating machine is a motor that drives a pump.
A plurality of the detectors are provided to detect vibration or sound pressure of the bearing of each of the plurality of motors.
The control unit detects vibration or sound pressure of the bearing of the motor that drives the pump operating at a constant speed at the highest frequency among the pumps operating in parallel by the detector.
The abnormality detection device according to [1].
[10]
The rotating machine is a motor that drives a pump.
When the discharge flow rate of the pump reaches the stop flow rate, the control unit detects the vibration or sound pressure of the bearing of the motor that drives the pump by the detector.
The abnormality detection device according to [1].
[11]
A plurality of the rotary machines are provided.
A plurality of the detectors are provided to detect the sound pressure of each bearing of the plurality of rotary machines.
The control unit detects the sound pressure with one of the plurality of detectors in a state where all the operations of the plurality of rotating machines are stopped, obtains the amplitude spectrum of the predetermined frequency band, and obtains this amplitude spectrum. Based on the operation data, the operation data and the initial data are compared, and if the difference between the initial data and the operation data is not equal to or more than a predetermined constant value, the sound pressure detection is stopped.
The abnormality detection device according to [1].

Claims (11)

A detector that detects vibration or sound pressure of a rotating shaft and a bearing that supports the rotating shaft of a rotating machine.
A storage unit that stores a threshold value for determining an abnormality,
Communication unit that communicates with external devices
After the rotating machine is installed at the installation site, the detection at the time of initial driving in a predetermined rotation speed range among a plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the rotating machine. The detection value of the device is Fourier transformed to obtain an amplitude spectrum in a predetermined frequency band, initial data based on this amplitude spectrum is stored in the storage unit, and the rotating machine is driven in the predetermined rotation speed range after the initial stage. The detection value of the detector at the time is Fourier transformed to obtain the amplitude spectrum of the predetermined frequency band, the operation data based on the amplitude spectrum is stored in the storage unit, and the ratio of the operation data to the initial data is calculated. When it is determined that the bearing is normal based on the ratio and the threshold value, the amplitude obtained by Fourier transforming the detection value of the detector in the predetermined rotational speed range to the external device via the communication unit. A control unit that transmits spectrum information and
Anomaly detection device comprising. The control unit obtains the amplitude spectrum a plurality of times for each predetermined number of times of driving set as the initial stage, compares the maximum peak values of the plurality of amplitude spectra obtained at the predetermined number of times, and obtains the largest value. The first aspect of claim 1, wherein the storage unit stores the initial data as the initial data, obtains the amplitude spectrum for each drive after the initial stage, and stores the maximum peak value of the obtained amplitude spectrum value as the operation data in the storage unit. Abnormality detection device. When the control unit determines that an abnormality has occurred in the bearing based on the ratio and the threshold value, the control unit determines the time at which the abnormality is determined, the number of times the rotating machine is started, the integrated operation time of the rotating machine, and the abnormality. The abnormality detection device according to claim 1, wherein the communication unit transmits the information of the amplitude spectrum obtained by Fourier transforming the detection value of the detector in a predetermined rotation speed range to the external device. The control unit tells the external device by the communication unit that the time when the abnormality is determined, the number of times the rotating machine is started, the integrated operation time of the rotating machine, and the predetermined rotation speed range in which the abnormality is determined. The abnormality detection device according to claim 3, wherein the information of the amplitude spectrum obtained by Fourier transforming the detection value of the detector is transmitted at a predetermined time set in advance. The abnormality is an abnormality that requires the rotating machine to be stopped.
When the control unit determines an abnormality, the control unit limits the drive of the rotating machine.
The abnormality detection device according to claim 3. The abnormality includes a first abnormality capable of continuing the operation of the rotating machine and a second abnormality requiring the rotating machine to be stopped.
The threshold value includes a first threshold value for determining the first abnormality and a second threshold value for determining the second abnormality.
The control unit determines that the ratio of the operation data to the initial data is less than the first threshold value, and determines that the ratio of the operation data to the initial data is equal to or more than the first threshold value and the first threshold value or more. If it is less than the threshold value of 2, it is determined as the first abnormality, and if the ratio of the operation data to the initial data is equal to or more than the second threshold value, it is determined as the second abnormality and the rotating machine is driven. The first aspect of claim 1, wherein when a limit is applied and a reset signal is received, the restriction of the rotating machine is released, and when a request signal for deleting the initial data is received, the initial data stored in the storage unit is deleted. The described anomaly detector. A plurality of the rotary machines are provided.
A plurality of the detectors are provided to detect the vibration or sound pressure of the bearing of each of the plurality of rotating machines.
When the control unit determines an abnormality in any of the bearings of the plurality of bearings based on the detection results of the plurality of detectors, the number of times the other rotating machine is started, the number of times the other rotary machine is started, and the like, which are stored in the storage unit. The communication unit transfers the integrated operating time of the rotating machine and the amplitude spectrum obtained by Fourier transforming the detection values of the detector in the predetermined rotation speed range of the rotating machine to the external device. Send,
The abnormality detection device according to claim 1. A plurality of the detectors are provided to detect the vibration or sound pressure of the bearing of each of the plurality of rotating machines.
The control unit detects vibration or sound pressure of the bearing of the rotating machine that is operating independently among the plurality of rotating machines.
The abnormality detection device according to claim 1. The rotating machine is a motor that drives a pump.
A plurality of the detectors are provided to detect vibration or sound pressure of the bearing of each of the plurality of motors.
The control unit detects vibration or sound pressure of the bearing of the motor that drives the pump operating at a constant speed at the highest frequency among the pumps operating in parallel by the detector.
The abnormality detection device according to claim 1. The rotating machine is a motor that drives a pump.
When the discharge flow rate of the pump reaches the stop flow rate, the control unit detects the vibration or sound pressure of the bearing of the motor that drives the pump by the detector.
The abnormality detection device according to claim 1. A plurality of the rotary machines are provided.
A plurality of the detectors are provided to detect the sound pressure of each bearing of the plurality of rotary machines.
The control unit detects the sound pressure with one of the plurality of detectors in a state where all the operations of the plurality of rotating machines are stopped, obtains the amplitude spectrum of the predetermined frequency band, and obtains this amplitude spectrum. Based on the operation data, the operation data and the initial data are compared, and if the difference between the initial data and the operation data is not equal to or more than a predetermined constant value, the sound pressure detection is stopped.
The abnormality detection device according to claim 1.

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