JP6918893B2 - Anomaly detection device - Google Patents

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 elements of the inner and outer rings of the rolling bearing of the motor move is damaged, the rolling element is damaged, and dust enters the rolling bearing. Or, there may be an abnormality such as insufficient lubrication due to insufficient grease of the rolling bearing. When these abnormalities occur, the bearing vibrates more than when there are no abnormalities.

Therefore, in order to determine the abnormality, there is known a technique of detecting the sound of the inspection target with an acoustic sensor and determining the abnormality of the detection target based on the detection result (see, for example, Patent Document 1). Further, there is also known a technique of detecting the vibration of a bearing with a vibration sensor and determining an abnormality of the bearing based on the detection result (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 7-12640 Japanese Unexamined Patent Publication No. 2003-148391

The technique of detecting vibration by the above-mentioned acoustic sensor or vibration sensor and determining an abnormality based on the detection result has the following problems. That is, in order to judge the abnormality of the bearing, the judgment value used for judging the abnormality of the bearing is determined by a test based on the detected value of the acoustic sensor or the vibration sensor, and this judgment value is compared with the detected value at the time of actual operation. There is a way to do it. However, the judgment value is determined by a test based on the detection value of the acoustic sensor or the vibration sensor in the factory where the water supply device is manufactured, and the water supply device is used as the detection value during actual operation to be compared with the judgment value. It is a detected value of an acoustic sensor or a vibration sensor at the installation site. Further, there is a problem that the accuracy of bearing abnormality determination is lowered because the installation conditions of the water supply device at the factory where the water supply device is manufactured and the installation conditions of the water supply device at the installation site where the water supply device is used are different.

That is, the installation site of the water supply device is, for example, various water supply sites such as condominiums, apartments, office buildings, factories, etc., and in each of them, for example, the support form of the piping on the suction side and the discharge side of each pump, and the vibration isolation of the pump. Anti-vibration stand for use, presence / absence of anchor placement, etc. are different. The installation conditions of the water supply device at these installation sites are also different from the installation conditions of the water supply device at the factory that manufactures the water supply device.

In this way, the difference in the installation conditions of the water supply device at the factory where the water supply device is manufactured and the installation conditions of the water supply device at the installation site where the water supply device is used affects the detection values of the acoustic sensor and the vibration sensor. As a result, it is not possible to accurately compare the values used for determining the abnormality of the bearing, which are calculated based on the detected values of the acoustic sensor and the vibration sensor, and as a result, the accuracy of determining the abnormality of the bearing may decrease.

Furthermore, since the motor is driven in the frequency band from the minimum rotation speed to the maximum rotation speed, many tests using an acoustic sensor or a vibration sensor from the minimum rotation speed to the maximum frequency of the motor are performed in order to judge the abnormality of the bearing. Judgment values are required, which complicates the process for determining abnormalities.

Therefore, an object of the present invention is to provide an abnormality detecting device capable of preventing the process of determining an abnormality of a bearing from becoming complicated and improving the accuracy of detecting an abnormality of a bearing of a rotating machine.

The abnormality detection device according to one aspect of the present invention is a detector that detects vibration or sound pressure of the bearing of a rotating machine including a rotating shaft and a bearing that supports the rotating shaft, and Fouriers the detection value of the detector. converted by calculating the amplitude spectrum, established the frequency of the amplitude spectrum is increased by abnormality of the bearing and the capable of storing the amplitude spectrum storage unit of a predetermined frequency band including multiple, the rotary machine installation site After that, the amplitude spectrum is obtained from the detection value of the detector at the time of initial driving of the rotating machine in each of a plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the rotating machine. It is stored in the storage unit as normal initial data, and the amplitude spectrum is obtained from the detection value of the detector at the time of driving the rotating machine after the initial stage in any of the plurality of rotation speed ranges, and the operation data is described as the operation data. It is stored in the storage unit, the initial data and the operation data are compared, and when the ratio of the operation data divided by the initial data is equal to or more than a certain threshold value, it is determined that the bearing has an abnormality. It is provided with a control unit for transmitting an alarm. The initial data and the operation data are the maximum peak values of the amplitude spectrum in the plurality of predetermined frequency bands obtained by Fourier transforming the detection values of the detector.

According to the present invention, it is possible to provide an abnormality detecting device capable of improving the accuracy of detecting an abnormality of a bearing of a rotating machine while preventing the process of determining an abnormality of the bearing from becoming complicated.

The front view which shows the structure of the water supply device which concerns on one Embodiment of this invention. A side view showing a partial cross-sectional view of the configuration of the water supply device. The side view which shows the structure of the detector of the abnormality detection device used for the water supply device and the vicinity thereof by a partial cross section. The cross-sectional view which shows the structure of the detector. The block diagram which shows the structure of the anomaly detection apparatus. An explanatory diagram showing initial data, operation data, and a threshold value of a predetermined frequency band used for determining a bearing abnormality stored in a storage unit used in the abnormality detection device. The graph which shows the relationship between the frequency and the amplitude spectrum in a predetermined frequency band obtained by Fourier transforming the detection value of the detector. The flow chart which shows an example of the judgment of the presence or absence of a bearing abnormality by the abnormality detection device. The explanatory view which shows the initial data of a predetermined frequency band used for determining the abnormality of the bearing stored in the storage part which concerns on the modification of the abnormality detection apparatus, and the threshold value. A graph showing the relationship between the frequency and the amplitude spectrum obtained by Fourier transforming the detection value of the detector, which is used to detect the rotation speed of the motor.

Hereinafter, the water supply device 10 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 8. 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 in a partial cross section. FIG. 3 is a side view showing a configuration of the detector 140 of the abnormality detection device 130 used in the water supply device 10 and its vicinity in a partial cross section. FIG. 5 is a block diagram showing the configuration of the abnormality detection device 130. FIG. 6 is an explanatory diagram showing initial data F, operation data C, and threshold value T of a predetermined frequency band used for determining an abnormality of the bearing 37 stored in the storage unit 150 used in the abnormality detection device 130. FIG. 7 is a graph showing the relationship between the frequency and the amplitude spectrum in a predetermined frequency band obtained by Fourier transforming the detection value of the detector 140. In FIG. 7, the horizontal axis represents the frequency (Hz) and the vertical axis represents the amplitude spectrum value (dB). FIG. 8 is a flow chart showing an example of determination of the presence or absence of bearing abnormality by the abnormality detection device 130.

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. The pipe 40, the plurality of check valves 50 provided in each discharge pipe 40, the plurality of on-off valves 60 provided in each discharge pipe 40, the connecting pipe 70 connecting the plurality of discharge pipes 40, and the connecting pipe 70. A connecting pipe 80 provided, a pressure accumulator 90 provided in the connecting pipe 80, a plurality of flow rate detectors 100 for detecting the flow rate on the secondary side of each pump device 30, and a pressure for detecting the pressure in the connecting pipe 70. It includes a detector 110 and a control device 120 that controls the operation of each pump device 30.

Further, 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 spindle 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 motor 31 is electrically connected to an inverter housed in a control board 122 of the 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.

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 tubular shape having an opening on the pump 32 side.
As shown in FIG. 3, the motor bracket 39 has a bracket main body 39a formed in a tubular shape 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 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. 3, 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. Further, the outer ring 37a is fixed to the motor bracket 39 by, for example, a pressing plate 37d. Specifically, the outer ring 37a is fixed in the axial direction of the rotating shaft 36 by the pressing plate 37d abutting 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 spindle 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. 1, 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. It 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 provided on the connecting pipe 70. 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 control device 120 includes a box 121 and a control board 122 housed in the box 121. 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. 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.

As shown in FIG. 5, the abnormality detection device 130 is used for determining the abnormality of the bearing and the detector 140 configured to be able to detect the vibration or sound pressure of the bearing of the rotating machine used in the water supply device 10. , A bearing abnormality is found based on a comparison between the storage unit 150 that stores a predetermined frequency band and threshold, the operation data calculated from the detection result of the detector 140, and the initial data stored in the storage unit 150. A control unit 160 for making a determination 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. The abnormality of the bearing 37 is caused by, for example, scratches on the raceway surface or the rolling element 37c, or foreign matter such as dust entering between the plurality of rolling elements 37c.

The bearing 37 vibrates significantly in the direction orthogonal to the axial direction of the rotating shaft 36 as compared with the normal state due to scratches on the raceway surface and the rolling element 37c. The bearing 37 vibrates significantly in the direction orthogonal 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. 3 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 141a or the like inside a case constituting the outer shell, and a hole 141b for propagating air vibration is formed in the diaphragm 141a in this case. The hole 141b is a so-called detection hole. The microphone 141 is mounted on the substrate 143 with the holes 141b facing the substrate 143 side. The microphone 141 detects the vibration of air by the vibration of the diaphragm 141a. The microphone 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. As shown in FIG. 3, a 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 141a through the hole of the microphone 141. The hole of the microphone 141 and the diaphragm 141a 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 surface of the substrate 143 opposite to the main surface on which the microphone 141 is mounted toward the 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 have the same diameter as or substantially the same diameter as the hole facing the diaphragm 141a 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 tubular 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 abuts on the other main surface of the substrate 143 with respect to one main surface 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 141a 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.

As shown in FIG. 2, 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. 3, 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. 3, 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. In the second part, the detector 140 is fixed. The detector 140 is fixed 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 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. It is configured so that initial data and operation data can be stored. Further, the storage unit 150 stores 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 and operation data stored based on the detection result of the detector 140 are obtained by calculating 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, cumulative values of the amplitude spectra 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 means that after the water supply device 10 is installed at the installation site, the motor 31 divides the motor 31 from the minimum rotation speed to the maximum rotation speed into a plurality of rotation speed ranges at the initial stage. It is a cumulative value of the amplitude spectrum of a predetermined frequency band obtained by Fourier transforming the detected value of the detector 140 when driven. 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 initial number of times of driving can be arbitrarily set once for the first time or a predetermined plurality of times.

For example, when the initial drive is set to one time, the detection value of the detector 140 at the time of the first drive in each of a plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the motor 31 is set. The cumulative value of the amplitude spectrum based on this is stored in the storage unit 150 as the initial data F.

When the initial drive is performed a plurality of times, for example, three times, it is based on the detection value of the detector 140 at the time of the first drive in each of a plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the motor 31. Cumulative value of amplitude spectrum The maximum value of the cumulative value of the amplitude spectrum based on the detection value of the detector 140 during the second drive and the cumulative value of the amplitude spectrum based on the detection value of the detector 140 during the third drive. Is stored as the initial data F. Alternatively, the cumulative value of the amplitude spectrum based on the detection value of the detector 140 at the time of the first drive in each of the plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the motor 31 is divided, and at the time of the second drive. The cumulative value of the amplitude spectrum based on the detection value of the detector 140 and the average value of the cumulative value of the amplitude spectrum based on the detection value of the detector 140 at the time of the third drive are stored as the initial data F.

The operation data C is the drive after the initial drive of the motor 31 in each of a plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the motor 31, that is, the motor 31 after the set number of times as the initial. It is the cumulative value of the amplitude spectrum based on the detection value of the detector 140 at the time of driving, and is updated in the storage unit 150. For example, when three times are initially set, the detector 140 at the time of the fourth driving of the motor 31 in each of a plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the motor 31 is divided. When the cumulative value of the amplitude spectrum based on the detected value is stored as the operation data C, and then the cumulative value of the amplitude spectrum based on the detected value of the detector 140 at the time of the fifth drive of the motor 31 is calculated, the operation data C is stored. It is updated to the storage unit 150.

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 FIG. 7, when an abnormality occurs in the bearing 37, the amplitude spectrum obtained by Fourier transforming the detected value of the detector 140 is obtained by the bearing 37 at a specific frequency regardless of the rotation speed of the motor 31. It tends to be larger than when it is normal. 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 singular or 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 band of 50 to 2500 Hz is a band used for human conversation, so it is not an unpleasant frequency 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 at any of the frequencies becomes large.

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.

The information and values stored in the storage unit 150 used for determining the abnormality of the bearing 37 are the information of a predetermined frequency band suitable for detecting the abnormality of the bearing 37 and the information of the predetermined frequency band suitable for detecting the abnormality of the bearing 37. The threshold T for comparison between the initial data F and the operation data C, the information indicating the order of determining the abnormality of the plurality of pump devices 30 included in the water supply device 10, the information of the detection timing by the detector 140, and the detector 140. The information of the time interval for detecting the information of the bearing 37 and the abnormal vibration counter.

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 threshold value T is used to determine the abnormality of the bearing 37. The abnormal state of the bearing 37 referred to here is, for example, a pre-alarm state which is a state of caution level. The pre-alarm state is an abnormal state that does not require replacement of the bearing 37. The threshold value T is a value for determining the magnitude of the ratio by comparing the initial data when the bearing 37 is normal with the operation data after the initial data acquisition.

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

For a predetermined frequency band set to 2500 to 3500 (Hz), for example, as shown in FIG. 6, a threshold value T of 2 is set in the rotation speed range 64 to 66 (Hz) of the motor 31. NS. The threshold value T is set to 2 in the rotation speed range 66 to 68 (Hz) of the motor 31. A threshold value T of 2 is set in the rotation speed range 68 to 70 (Hz) of the motor 31. A threshold value T of 2 is set in the rotation speed range of the motor 31 from 70 to 72 (Hz). A threshold value T of 3 is set in the rotation speed range 72 to 74 (Hz) of the motor 31. A threshold value T of 3 is set in the rotation speed range 74 to 75 (Hz) of the motor 31.

When a plurality of predetermined frequency bands are set, the threshold T is set for each of the plurality of predetermined frequency bands, and the information of the bearing 37 is set by the detector 140 set in each of the rotation speed ranges of the motor 31 as shown in FIG. The information on the timing of detecting the above is, for example, in the present embodiment, the control unit 160 is every 10 seconds. The information of the time interval 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.

The abnormal vibration counter is the number of times of abnormality determination required for the control unit 160 to transmit an alarm. In the present embodiment, the abnormal vibration counter stores, for example, 3 as an initial value.

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 driving pump device 30 from the control board 122. The information about the driving pump device 30 is the machine number indicating the driving pump device 30 and the rotation speed information of the motor 31 of the driving pump device 30.

Further, the control unit 160 calculates the initial data F and the operation data C from the detected values of the detector 140. For example, the cumulative amplitude spectrum of a predetermined frequency band obtained by AD (Analog Digital) conversion of the detection value for 3 seconds performed by the detector 140 at 10-second intervals during the initial drive of the motor 31 and then Fourier transform. The initial data F is obtained based on the value. When the motor 31 is driven after the initial stage, the cumulative value of the amplitude spectrum of a predetermined frequency band obtained by the Fourier transform after AD conversion of the detection value for, for example, 3 seconds performed by the detector 140 at intervals of 10 seconds, for example, is obtained. Let it be operation data C. Here, the time interval at which the detection is performed by the detector 140 is set to 10 seconds as an example, but this can be set arbitrarily. The time for detection by the detector 140 is set to 3 seconds as an example, but this can be set arbitrarily.

More specifically, the control unit 160 detects the detector 140 at the time of initial driving, that is, at the time of the first or a plurality of driving in each of the plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the motor 31. The cumulative value D of the amplitude spectrum of the predetermined frequency band obtained by Fourier transforming the values is stored in the storage unit 150 as the initial data F.

In the present embodiment, the initial data F is stored in each of the six divisions of the rotation speed range from the minimum rotation speed 64 (Hz) to the maximum rotation speed 75 (Hz) of the motor 31. 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, and 74 to 75 (Hz) rotation speed range. FIG. 6 shows an example of the initial data F.

Further, the control unit 160 is a detection value of the detector 140 at the time of the initial drive of each of the above-mentioned plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the motor 31, that is, the second or the second and subsequent drives. The cumulative value D of the amplitude spectrum of the predetermined frequency band obtained by Fourier transforming is stored in the storage unit 150 as operation data C and updated.

Further, the control unit 160 calculates the ratio R (R = C / F) of the operation data C to the initial data F. Then, the control unit 160 compares the ratio R with the threshold value T to determine whether or not there is an abnormality in the bearing 37. FIG. 6 shows an example of the operation data C.

Specifically, the control unit 160 determines that the bearing 37 has an abnormality when the ratio R is equal to or higher than the threshold value T. When the control unit 160 determines that the bearing 37 has an abnormality, it transmits an alarm to an external device. The external device referred to here is a device capable of notifying an operator or the like that an abnormality has occurred in the bearing 37, and is, for example, a monitor, a speaker, or the like. When these external devices receive an alarm from the control unit 160, they notify the surroundings by displaying or sounding. When the control unit 160 determines that the bearing 37 is abnormal, the control unit 160 continues to transmit an alarm.

Further, the control unit 160 is configured to be able to stop the alarm transmission when it receives a request from the outside to stop the alarm transmission in a state where it determines that the bearing 37 has an abnormality and transmits an alarm to the external device. .. Further, the control unit 160 is configured to be able to delete the initial data F stored in the storage unit 150.

An operation unit 180 for transmitting a signal requesting the stop of alarm transmission and a deletion signal requesting deletion of the initial data F stored in the storage unit 150 to the control unit 160 is provided in, for example, the box 121. May be good. The operation unit 180 is electrically connected to the control unit 160, and when operated, the operation unit 180 transmits a signal requesting the stop of alarm transmission or a deletion signal to the control unit 160.

The operation unit 180 may have a common configuration, for example, and transmits an alarm transmission stop signal or a deletion signal according to the operation. For example, in a configuration in which the operation unit 180 is a button, when the pushing operation of the operation unit 180 is a predetermined time or less, the operation unit 180 transmits a stop request signal for alarm transmission to the control unit 160. When the pushing operation of the operation unit 180 exceeds a predetermined time, the operation unit 180 transmits a deletion signal to the control unit 160. The operation unit for requesting the stop of alarm transmission and the operation unit for requesting deletion of the initial data F stored in the storage unit 150 may have different configurations.

Alternatively, a receiving unit for receiving the alarm transmission stop request signal and the deletion signal transmitted from an external device such as a remote controller 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 alarm transmission stop request signal from the operation unit or the external device, the control unit 160 stops the alarm transmission. Further, when the control unit 160 receives the deletion signal from the operation unit or the external device, 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 the number of times is the same as the initial number of times of the motor 31. The 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 at the time of driving, 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 in the same manner as when the water supply device 10 is installed at the installation site and then driven at the initial stage of the motor 31. F is obtained and stored in the storage unit 150.

Next, an example of the operation of the detector 140 will be described.
In this embodiment, the water supply device 10 drives a plurality of pump devices 30 by an alternating operation system. 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 141a of the microphone 141. The microphone 141 detects the vibration of air by detecting the vibration of the diaphragm 141a. The detector 140 transmits the detected value to the control unit 160.

As shown in FIG. 8, when the control unit 160 receives information about the pump device 30 being driven from the control board 122, the control unit 160 identifies the motor 31 being driven from this information and determines the rotation speed of the motor 31. Detect (step ST1).

Next, the control unit 160 determines whether or not the abnormal vibration flag is ON (step ST2). If the abnormality of the bearing 37 of the motor 31 has already been determined, the abnormal vibration flag is ON. When the abnormal vibration flag is OFF (NO in step ST2), the control unit 160 determines whether or not the initial data F is stored in the storage unit 150 (step ST3).

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 ST3), the control unit 160 calculates the cumulative value D based on the signal from the detector 140, and uses this as the initial data F. It is stored in the storage unit 150 (step ST4).

When the control unit 160 determines that the initial data F is stored in the storage unit 150 (YES in step ST3), the control unit 160 calculates the cumulative value D based on the signal from the detector 140 and uses the storage unit 160 as the operation data C. Store in 150 (step ST6). If the operation data C is already stored, the control unit 160 updates it. That is, the storage unit 150 stores the latest cumulative value D as operation data.

Next, the control unit 160 calculates the ratio R (R = C / F) of the initial data F to the operation data C (step ST7). Next, the control unit 160 compares the ratio R with the threshold value T stored in the storage unit 150 (step ST8). When the control unit 160 determines that the ratio R is equal to or higher than the threshold value T (YES in step ST8), the control unit 160 sets the value obtained by subtracting the abnormal vibration counter stored in the storage unit 150 by -1 as a new abnormal vibration counter in the storage unit 150. Remember (step ST9). As the abnormal vibration counter, for example, 3 is stored in the storage unit 150 as an initial value.

Next, the control unit 160 determines whether or not the abnormal vibration counter is 0 (step ST10). When the control unit 160 determines that the abnormal vibration counter is 0 (YES in step ST10), the control unit 160 transmits an alarm and turns on the abnormal vibration flag (step ST11). The fact that the abnormal vibration counter is 0 indicates that the determination that the ratio in step ST8 is equal to or higher than the threshold value T has been performed the same number of times as the initial value of the abnormal vibration counter. The control unit 160 then returns to step ST1.

Further, the control unit 160 stops the alarm transmission when the operation unit 180 is operated to receive the alarm transmission stop request signal while the alarm is being transmitted. Further, when the operation unit 180 is operated and the control unit 160 receives the deletion signal of the initial data F stored in the storage unit 150, the control unit 160 deletes the initial data F stored in the storage unit 150.

According to the detector 140 configured in this way, after the water supply device 10 was installed at the installation site, it was initially driven in each of a plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the motor 31. The cumulative value D of the amplitude spectrum of the predetermined frequency band obtained by the AD conversion of the detection value of the detector 140 at the time is subjected to the Fourier transform is stored in the storage unit 150 as the initial data F, and the next time or a plurality of times of driving is performed. The cumulative value D is stored in the storage unit 150 as the operation data C, and the ratio R is calculated from the initial data F and the operation data C. Then, when the ratio R is equal to or higher than the threshold value T, the control unit 160 determines that the bearing 37 has an abnormality and transmits an alarm.

In this way, the cumulative value D 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 is calculated, and the initial data F and the operation are performed. By storing the data 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, as the initial data F and the operation data C, the cumulative amplitude spectrum of a predetermined frequency band including the frequency at which the amplitude changes when an abnormality occurs in the bearing 37 in the relationship between the frequency obtained by Fourier transform and the amplitude. By using the value, the accuracy of detecting the abnormality of the bearing 37 can be improved.

That is, by setting the cumulative value in the predetermined frequency band, it is possible to suppress that the ratio of the change in amplitude due to the abnormality of the bearing 37 to the cumulative value becomes small. As a result, the accuracy of detecting the abnormality of the bearing 37 can be improved.

Further, since the initial data F and the operation data C are calculated by dividing the motor 31 from the minimum rotation speed to the maximum rotation speed into a plurality of rotation speed ranges, the initial data F and the operation of any of the rotation speed ranges are calculated. With the data C, it is possible to determine the abnormality of the bearing 37. As a result, it is possible to prevent the number of calculation steps of the control unit 160 required for determining the abnormality of the bearing 37 from increasing, and thus it is possible to prevent the process of determining the abnormality of the bearing 37 from becoming complicated.

Further, since the initial data F stored in the storage unit 150 can be deleted, for example, even when the motor 31 or the bearing 37 of the water supply device 10 is replaced, it depends on the bearing 37 of the pump device 30 after the replacement. The initial data F and the operation data C can be stored in the storage unit 150 again.

Further, since the control unit 160 stops the alarm transmission by receiving the signal of the alarm transmission stop request, for example, when the operator or the like determines that there is no abnormality in the bearing 37 after receiving the alarm. In addition, only the transmission of alarms can be stopped.

Further, the control unit 160 can obtain the rotation speed of the motor 31 by having a configuration in which information on the rotation speed of the driving motor 31 can be received from the control board 122 that controls the drive of the motor 31. It becomes.

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.

As described above, according to the water supply device 10 according to the embodiment of the present invention, the abnormality that can prevent the process of determining the abnormality of the bearing from becoming complicated and improve the detection accuracy of the abnormality of the bearing of the rotating machine. A detector can be provided.

The present invention is not limited to the above-mentioned example. In the above example, the storage unit 150 uses initial data F and operation data such as a threshold T, a predetermined frequency band, etc., which are used for determining an abnormality of the bearing 37 according to the bearing 37 of the motor 31 of one type of pump device 30. The configuration for storing the information of C has been described as an example, but the present invention is not limited to this. In another example, the storage unit 150 is configured to store information such as a threshold value corresponding to the bearing of a rotating machine such as a plurality of types of motors, a frequency band suitable for determining an abnormality of the bearing, and the like. It is possible to select the threshold value stored in the storage unit 150 and the frequency band and threshold information suitable for determining the abnormality of the bearing according to the rotating machine for which the abnormality is detected.

Further, in the above example, the cumulative value D of the amplitude spectrum of a single or a plurality of predetermined frequency bands suitable for detecting the abnormality of the bearing 37, which is obtained by performing the Fourier transform after the detection result of the detector 140 is AD-converted, is the initial value. The configuration used as the data F and the operation data C has been described as an example, but is not limited thereto. In another example, another example of initial data F and operation data C obtained based on the amplitude spectrum of a single or a plurality of predetermined frequency bands obtained by Fourier transforming the detection result of the detector 140 after AD conversion. As a result, the detection result of the detector 140 may be AD-transformed and then Fourier-transformed, and each maximum peak value of the amplitude spectrum in a single or a plurality of predetermined frequency bands may be used.

In this configuration, the control unit 160 is obtained by performing an AD conversion and then a Fourier transform on the detection result of the first detector 140 in each of the plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the motor 31. Each maximum peak value of the amplitude spectrum in a single or a plurality of predetermined frequency bands is stored in the storage unit 150 as initial data F. Then, the control unit 160 is obtained by AD conversion and then Fourier conversion of the detection values of the detector 140 for the next time or the plurality of times in each of the plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the motor 31. Each maximum peak value P of the amplitude spectrum in the predetermined frequency band is stored in the storage unit 150 as operation data C, and the maximum peak values P of the initial data F and the operation data C in the same predetermined frequency band are compared with each other. .. That is, the frequencies of the maximum peak value P of the initial data F and the operation data C are in the same predetermined frequency band, but may have different numerical values. Then, when the ratio R between the maximum peak values P of the initial data F and the operation data C is equal to or greater than the threshold value T in any of the predetermined frequency bands, the bearing 37 has an abnormality. Judge and send an alarm.

Further, in the above-mentioned example, the configuration in which one threshold value T to be compared with the ratio R is used has been described as an example, but the present invention is not limited to this. In another example, a plurality of thresholds may be used so that the degree of abnormality can be determined in a plurality of steps. As an example of this, as shown in FIG. 9, the storage unit 150 has a pre-alarm threshold value T1 for determining a pre-alarm state, which is a state of caution and an abnormal state that does not require replacement of the bearing 37, and a bearing. The alarm threshold value T2 for determining the alarm state, which is an abnormal state requiring replacement of 37, may be stored. The pre-alarm threshold value T1 referred to here is the same value as the above-mentioned threshold value T.

FIG. 9 shows, as an example, a pre-alarm threshold value T1 and an alarm threshold value T2 set for a frequency band of 2500 to 3500 (Hz) as a predetermined frequency band. Specifically, in the predetermined frequency band set to 2500 to 3500 (Hz), the alarm threshold value T2 is set to 4 in the rotation speed range 64 to 66 (Hz) of the motor 31. The alarm threshold value T2 is set to 4 in the rotation speed range 66 to 68 (Hz) of the motor 31. The alarm threshold value T2 is set to 4 in the rotation speed range 68 to 70 (Hz) of the motor 31. The alarm threshold value T2 is set to 6 in the rotation speed range 70 to 72 (Hz) of the motor 31. The alarm threshold value T2 is set to 6 in the rotation speed range 72 to 74 (Hz) of the motor 31. The alarm threshold value T2 is set to 6 in the rotation speed range 74 to 75 (Hz) of the motor 31. As a modification in the case where one threshold value T is used, the alarm threshold value T2 may be used instead of the pre-alarm threshold value T1.

If the ratio R is equal to or greater than the pre-alarm threshold T1 for determining the pre-alarm state and less than or equal to the alarm threshold T2 for determining the alarm state, the control unit 160 determines that the bearing 37 is in the pre-alarm state. .. Further, the control unit 160 determines that the bearing 37 is in the alarm state when the ratio R is equal to or higher than the alarm threshold value T2 for determining the abnormal state. Then, when the control unit 160 determines the pre-alarm state of the bearing 37, it transmits an alarm indicating that the bearing 37 is in the pre-alarm state, and when it determines the alarm state of the bearing 37, the control unit 160 determines that the bearing 37 is in the alarm state. Send an alarm to indicate.

In this way, by using a plurality of threshold values so that the degree of abnormality of the bearing 37 can be determined in a plurality of stages, it is necessary to replace the bearing 37, or it is only necessary to inspect the bearing 37. , The importance of the work on the bearing 37 can be determined.

Further, in the above example, the configuration in which the control unit 160 receives information on the driving motor 31 from the control board 122 of the water supply device 10 has been described as an example, but the present invention is not limited to this. In another example, the control unit 160 is configured to detect the rotation speed of the motor 31 from the frequency of the maximum peak value of the amplitude spectrum obtained by AD-converting the detection result of the detector 140 and then Fourier-transforming it. May be good.

Specifically, the control unit 160 detects the frequency of the maximum peak value of the amplitude spectrum of the rotation speed detection frequency band obtained by the AD conversion of the detection result of the detector 140 and then the Fourier transform, and sets the frequency to this frequency. Multiply the coefficient peculiar to the motor 31. The value obtained by multiplying the coefficients is treated as the rotation speed of the motor 31.

The rotation speed detection frequency band is a value corresponding to the minimum rotation speed and the maximum rotation speed of the rotating machine. That is, since the value obtained by dividing the rotation speed by a coefficient is the frequency at which the vibration intensity is the maximum in the relationship between the frequency of the maximum peak value of the amplitude spectrum obtained by the Fourier transformation and the vibration intensity, the rotation speed is detected. The minimum value of the frequency band for rotation speed is set to be less than or equal to the value obtained by dividing the minimum rotation speed of the rotating machine by a coefficient, and the maximum value of the frequency band for detecting the rotation speed is equal to or more than the value obtained by dividing the maximum rotation speed of the rotating machine by a coefficient. Set.

This example will be described with reference to FIG. FIG. 10 is a graph showing the distribution of the amplitude spectrum obtained by performing the Fourier transform after the detection result of the detector 140 is AD-transformed. In FIG. 10, the horizontal axis represents the frequency and the vertical axis represents the amplitude spectrum value. As shown in FIG. 10, the rotation speed detection frequency band set in the motor 31 is 0 to 1000 Hz as an example. The coefficient is a value peculiar to the motor 31, and is 1/9 as an example in the motor 31. The information and the coefficient of the rotation speed detection frequency band are stored in the storage unit 150.

When one pump device 30 is driven to receive a signal from the detector 140, the control unit 160 first receives a predetermined time from the start of receiving the signal from the detector 140 before detecting the initial data F or the operation data C. For example, the amplitude spectrum of the rotation speed detection frequency band is obtained by Fourier transforming the detection result of the detector 140 for 1 second. The predetermined time referred to here is the detection time by the detector 140, which is necessary for detecting the rotation speed. In the case of the motor 31, as shown in FIG. 10, the amplitude spectrum shows the maximum peak value at 675 Hz.
The control unit 160 obtains the rotation speed 75 (Hz) of the motor 31 by multiplying 675 by 1/9, in other words, dividing by 9. The coefficient can be obtained by, for example, a test.

Further, the above-mentioned abnormality detection device 130 has been described as an example of a configuration in which only an abnormality of the bearing 37 is determined, but the present invention is not limited to this. In another example, the abnormality detecting device 130 may be configured to detect water leakage from the shaft sealing device 34 of the water supply device 10, for example, in addition to determining the abnormality of the bearing 37. For example, as shown in FIG. 2, a sensor 170 for detecting water leakage from the shaft sealing device 34 is provided, the detection result of the sensor 170 is transmitted to the control unit 160, and the control unit 160 determines the water leakage. You may. The sensor 170 has two electrodes.

The control unit 160 applies a voltage to one of the two electrodes of the sensor 170. If there is water leakage from the shaft sealing device 34, these two electrodes are immersed in water and short-circuited. Therefore, the presence or absence of water leakage can be determined by measuring the voltage between these two electrodes. In this configuration, the control unit 160 determines whether or not there is a water leak in the shaft sealing device 34 of the driving pump device 30 based on the information of the driving pump device 30 received from the control board 122. If this is the case, water leakage can be determined efficiently.

Further, in the above example, since the detector 140 is configured to output an analog signal, the control unit 160 has been described as an example of a configuration in which the detection result of the detector 140 is AD-converted and then Fourier-transformed. Not limited to this. For example, when the detector 140 is configured to output a digital signal, the control unit 160 does not need to AD convert the detection result of the detector 140.

Further, in the above example, the configuration in which the control device 120 drives a plurality of pump devices 30 by alternating operation control has been described as an example, but the present invention is not limited to this. In another example, the control device 120 may control a plurality of pump devices 30 by parallel operation control in which two or more pump devices 30 are driven at the same time. Even in this case, the abnormality detection device 130 determines the abnormality of the bearing 37 when only one pump device 30 is driving, that is, when only one motor 31 is driving. Since it is not affected by the vibration and noise of other motors 31, bearing abnormalities can be detected with high accuracy, and since it is not necessary to provide a control unit 160 for each detector 140, the abnormality detection device 130 The manufacturing cost can be reduced.

Further, in the above example, the threshold value T is the ratio of the initial data F when the bearing 37 is normal and the operation data C after a long period of operation time elapses, and the threshold value T is the ratio R (operation data C). The configuration to be compared with the operation data C / initial data F), which is the value divided by the initial data F, has been described as an example, but the present invention is not limited to this.

In another example, the expression of the ratio is not the magnification but "dB", and the threshold value T is the difference between the initial data F when the bearing 37 is normal and the operation data C after a long operation time has elapsed. good. In this case, the difference between the operation data C and the initial data F is compared with the threshold value T (dB), and if the value of this difference is equal to or greater than the threshold value T (dB), it is determined that the bearing 37 has an abnormality. In particular, since the unit of the amplitude spectrum value of sound pressure is expressed in dB, it is easier to be familiar with the physical expression if the threshold value T is the difference in dB units.

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, in which 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 capable of storing the amplitude spectrum of a single or a plurality of predetermined frequency bands including a frequency in which the amplitude spectrum increases due to an abnormality of the bearing by Fourier transforming the detection value of the detector to calculate the amplitude spectrum.
After the rotary machine is installed at the installation site, the detector is detected at the initial drive of the rotary machine in each of a plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the rotary machine. The amplitude spectrum is obtained from the value and stored in the storage unit as normal initial data, and the amplitude is obtained from the detection value of the detector during the initial and subsequent driving of the rotating machine in any of the plurality of rotation speed ranges. The spectrum is obtained and stored as operation data in the storage unit, the initial data and the operation data are compared, and if the ratio is equal to or higher than a certain threshold value, it is determined that there is an abnormality in the bearing and an alarm is transmitted. Control unit and
Anomaly detection device comprising.
[2]
The abnormality detection device according to [1], wherein the initial data and the operation data are cumulative values of the amplitude spectra of the single or a plurality of predetermined frequency bands obtained by Fourier transforming the detection values of the detector.
[3]
The abnormality detection device according to [1], wherein the initial data and the operation data are maximum peak values of an amplitude spectrum in the single or a plurality of predetermined frequency bands obtained by Fourier transforming the detection values of the detector. ..
[4]
The storage unit stores information on a frequency band for detecting the rotation speed for detecting the rotation speed of the rotating machine, and a coefficient for obtaining the rotation speed of the rotating machine.
The control unit obtains the amplitude spectrum of the rotation speed detection frequency band by Fourier transforming the detection value of the detector, and determines the frequency of the maximum peak value of the amplitude spectrum in the rotation speed detection frequency band. The rotation speed of the rotating machine is obtained by multiplying the frequency of the maximum peak value by the coefficient.
The abnormality detection device according to [1].
[5]
The control unit receives information on the rotation speed of the rotary machine from the rotary machine control unit that controls the drive of the rotary machine.
The abnormality detection device according to [1].
[6]
The storage unit stores the single or a plurality of predetermined frequency bands and a plurality of the threshold values corresponding to each of the plurality of rotation speed ranges.
The control unit selects a plurality of rotation speed ranges from the plurality of threshold values and a threshold value corresponding to the predetermined frequency band.
The abnormality detection device according to [1].
[7]
The storage unit stores a plurality of the threshold values corresponding to the bearings of the plurality of types of rotary machines.
The control unit selects a threshold value corresponding to the bearing from the plurality of threshold values.
The abnormality detection device according to [1].
[8]
When the control unit receives the alarm stop signal, it stops transmitting the alarm, and when it receives the signal for deleting the initial data stored in the storage unit, the control unit deletes the initial data stored in the storage unit. After the deletion, the amplitude spectrum is obtained from the detection value of the detector at the same number of times of driving as the initial time in each of the plurality of rotation speed ranges of the rotating machine, and stored in the storage unit as the initial data. , [1].
[9]
A plurality of the rotary machines are provided,
The abnormality detection device according to [1], wherein the control unit determines whether or not there is an abnormality in the bearing when only one of the plurality of rotating machines is being driven.

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.

Claims (7)

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 capable of storing the amplitude spectrum in a plurality of predetermined frequency bands including frequencies in which the amplitude spectrum increases due to an abnormality of the bearing by Fourier transforming the detection value of the detector to calculate the amplitude spectrum.
After the rotary machine is installed at the installation site, the detector is detected at the initial drive of the rotary machine in each of a plurality of rotation speed ranges from the minimum rotation speed to the maximum rotation speed of the rotary machine. The amplitude spectrum is obtained from the value and stored in the storage unit as normal initial data, and the amplitude is obtained from the detection value of the detector during the initial and subsequent driving of the rotating machine in any of the plurality of rotation speed ranges. When the spectrum is obtained and stored as operation data in the storage unit, the initial data and the operation data are compared, and the ratio of the operation data divided by the initial data is equal to or more than a certain threshold value, the operation data is described. A control unit that determines that there is something wrong with the bearing and sends an alarm,
Equipped with
The initial data and the operation data are the maximum peak values of the amplitude spectrum in the plurality of predetermined frequency bands obtained by Fourier transforming the detection values of the detector.
Anomaly detection device. The storage unit stores information on a frequency band for detecting the rotation speed for detecting the rotation speed of the rotating machine, and a coefficient for obtaining the rotation speed of the rotating machine.
The control unit obtains the amplitude spectrum of the rotation speed detection frequency band by Fourier transforming the detection value of the detector, and determines the frequency of the maximum peak value of the amplitude spectrum in the rotation speed detection frequency band. The rotation speed of the rotating machine is obtained by multiplying the frequency of the maximum peak value by the coefficient, and the maximum peak value is obtained in the plurality of rotation speed ranges including the rotation speed obtained based on the coefficient. Store in one of the ranges of
The abnormality detection device according to claim 1. The control unit receives information on the rotation speed of the rotary machine from the rotary machine control unit that controls the drive of the rotary machine, and includes the maximum peak value received from the rotary machine control unit. Store in any of multiple rotation speed ranges,
The abnormality detection device according to claim 1. The storage unit stores the plurality of predetermined frequency bands and the plurality of threshold values corresponding to each of the plurality of rotation speed ranges.
The control unit selects the plurality of rotation speed ranges and the threshold value corresponding to the predetermined frequency band from the plurality of threshold values.
The abnormality detection device according to claim 1. The storage unit stores a plurality of the threshold values corresponding to the bearings of the plurality of types of rotary machines.
The control unit selects a threshold value corresponding to the bearing from the plurality of threshold values.
The abnormality detection device according to claim 1. When the control unit receives the alarm stop signal, it stops transmitting the alarm, and when it receives the signal for deleting the initial data stored in the storage unit, the control unit deletes the initial data stored in the storage unit. After the deletion, the amplitude spectrum is obtained from the detection value of the detector at the same number of times of driving as the initial time in each of the plurality of rotation speed ranges of the rotating machine, and stored in the storage unit as the initial data. , The abnormality detection device according to claim 1. A plurality of the rotary machines are provided,
The abnormality detection device according to claim 1, wherein the control unit determines whether or not there is an abnormality in the bearing when only one of the plurality of rotating machines is being driven.

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