JP5797508B2 - Adjustment control system and method for adjusting bearing wear monitoring device - Google Patents

Description

  The present invention detects the displacement in the longitudinal direction of the rotor and the displacement in the radial direction of the can motor by detection coils installed on both sides of the stator in the longitudinal direction, and detects axial and radial wear in the bearing. The present invention relates to an adjustment control system for adjusting a bearing wear monitoring device attached to a motor for monitoring, an adjustment method for the bearing wear monitoring device, and a bearing wear monitoring device.

  2. Description of the Related Art Conventionally, a canned motor pump in which a motor and a pump are integrated, a bearing portion, a rotor (rotor), and an impeller are accommodated in a handling liquid and a stator is installed outside the can is known. The motor has, from the inside, a double structure including a can (stator liner) that comes into contact with the liquid to be handled, and a terminal plate of a terminal flange to which the motor terminal is attached and a stator band that covers the outer periphery of the stator. The handling liquid is pressurized by the impeller and sent to the discharge side, and a part thereof is sent to the motor side to lubricate the bearing and cool the motor, and return to the suction side through a through hole provided in the shaft.

  Canned motor pumps are used in plants that require high reliability as pumps that have excellent quietness without liquid leaking to the outside. However, since the bearing of the canned motor is a fluid lubricated bearing using a handling liquid and the state of the bearing cannot be seen from the outside at all, a device for monitoring the wear of the bearing is indispensable.

  As a canned motor bearing wear monitoring apparatus, there is a canned motor bearing wear monitoring apparatus disclosed in Patent Document 1. This bearing wear monitoring device measures the change in the magnetic field that changes during rotation of the rotor with the detection coils installed at both ends of the stator in the longitudinal direction, thereby monitoring the wear of the bearings in which the rotor is displaced in the radial direction. In addition, the wear of a bearing worn so as to be displaced in the axial direction or in an inclined state is monitored. Although depending on the use situation of the canned motor, in general, the bearing needs to be replaced every two to three years due to wear. A circuit board composed of electronic components has a shorter life compared to a detection coil and a stator coil of a bearing wear monitoring device, and the circuit board needs to be replaced every five to six years due to deterioration of the electronic components.

  Conventionally, when replacing the circuit board in the bearing wear monitoring device, the mechanical center position (mechanical center) of the shaft of the canned motor and the center position (magnet center) by the magnetic field detection detected by the bearing wear monitoring device Since it is necessary to adjust the zero point so as to match, the bearing itself is often replaced with a new one in consideration of work efficiency. Further, since the bearing wear monitoring device detects the induced voltage due to the rotation of the canned motor, the zero point adjustment needs to be performed while rotating the motor.

  Patent Document 2 describes an axial zero point adjusting method in a bearing wear monitoring device for a canned motor. In Patent Document 2, after setting the axial center position (mechanical center) of the rotor and the stator, by adjusting the output signal of the detection coil to the same level in the mechanical center, the axial zero point of the bearing wear monitoring device An adjustment method for making the magnet center correspond to the mechanical center is disclosed.

Japanese Patent No. 3488578 Japanese Patent No. 3637553

  As described above, there is a case where there is no problem with the bearing itself, and even when only the bearing wear monitoring device fails, the bearing and the bearing wear monitoring device may be replaced. Further, the signal of the detection coil used for bearing wear monitoring differs depending on the canned motor due to mechanical tolerances at the time of manufacturing the stator. Furthermore, even if the setting state of the bearing wear monitoring device is set to a new bearing wear monitoring device and adjusted to match the detection coil signal, sufficient accuracy cannot be obtained. The applicant's investigation has revealed that the characteristics of the input circuit of the monitoring device may also have an effect. In particular, in areas where there are not enough adjustment devices, it is difficult to perform adjustment work, so the entire canned motor pump had to be sent to the factory and readjusted. This is also related to the variation in the characteristics of the input circuit of the bearing wear monitoring device and the need to rotate the canned motor in the handling liquid in order to make the sliding bearing by fluid lubrication provided in the canned motor pump function. Yes.

  Therefore, the adjustment control system, the method for adjusting the bearing wear monitoring device, and the bearing wear monitoring device according to the present invention can be adjusted locally without having to send the entire canned motor pump back to the factory when replacing the bearing wear monitoring device. An object of the present invention is to provide an adjustment control system that does not require bearing replacement, a method for adjusting a bearing wear monitoring device, and a bearing wear monitoring device.

To achieve the above object, the adjustment control system according to the present invention, a plurality of detection coils placed the position of the thrust direction or the radial direction of the rotor of the motor provided in canned motor pump stator detected by the detection signal detected by the detection coil, the adjustment control system to adjust the bearings wear monitoring equipment that converts the amount of wear of the bearing for rotatably supporting the rotor, the bearing wear monitoring device A zero point adjustment function for performing zero point adjustment based on the detection signal obtained from the detection coil when the motor is driven and the position of the rotor in the thrust direction and radial direction when the detection signal is obtained the has, the adjustment control system includes a communication means for communicating with the bearing wear monitoring device, instead of actually detected by the detection signal by the detection coil, the times The pseudo signal simulating a detection signal obtained when positions the child to a particular thrust direction position and radial position, has an output means for outputting to said bearing wear monitoring device via the communication means The zero point adjustment is executed by the bearing wear monitoring device based on the pseudo signal .

Further, in the adjustment control system according to the present invention, prior to shipment of the canned motor, from the detection coil when driving the said canned motor in a state of being positioned with the rotor to a particular thrust direction position and radial position It possesses a signal recording means for recording as a logging signal taken out a signal output, and management means for managing the recorded logging signal for each identification ID of the motor, the output means of the adjustment control system, recorded logging A signal is output to the bearing wear monitoring device as the pseudo signal . Such a function is particularly important in managing the motor characteristics at the time of factory shipment, and further, the bearing wear monitoring device can be adjusted by recording the detection signal of the detection coil.

In the adjustment control system according to the present invention , a reference waveform that is a standard waveform, and a gain that indicates an amplitude ratio between the reference waveform and a signal waveform that is actually output from the detection coil of the corresponding canned motor. A storage unit that stores a coefficient, and a unit that generates a pseudo signal corresponding to the bearing wear monitoring device to be adjusted based on the reference waveform stored in the storage unit and the gain coefficient. It is characterized by that. By using this function, it is possible to reduce the rate of increase by consolidating recorded signals, which increase with the increase in the number of motors produced, by motor structure . Rather than collecting the detection signal of each detection coil as a logging waveform and using it as it is, it records the waveform data with common characteristics from multiple collected logging waveforms as a reference waveform, and simulates the same characteristics as the logging waveform. to force out of the waveform. This is because of the compression of the storage capacity.

Method of adjusting bearing wear monitoring apparatus according to the present invention detects a plurality of detection coils installed respectively the position of the thrust direction or the radial direction of the rotor of the motor provided in canned motor in the thrust direction on both sides of the stator In the adjustment method for adjusting the bearing wear monitoring device that converts the detection signal detected by each detection coil into the wear amount of the bearing that pivotally supports the rotor , instead of the detection signal actually detected by the detection coil A pseudo signal imitating the detection signal obtained when the rotor is positioned at a specific thrust direction position and radial direction position to the bearing wear monitoring device; and , this having the said recorded signal with the particular thrust-direction position and radial position, a step of executing the zero point adjustment, the The features.

Further, in the adjustment method of the bearing wear monitoring apparatus according to the present invention, when the can motor is driven in a state where the rotor is positioned at a specific thrust direction position and a radial position before the can motor is shipped. a signal recording step of recording the log signal is taken out a signal output from the detection coil, seen including a management unit, the managing record logging signal for each identification ID of the canned motor pump, wherein the input step, The recorded logging signal is input to the bearing wear monitoring device as the pseudo signal .

  By using the adjustment control system and the adjustment method of the bearing wear monitoring device according to the present invention, the entire canned motor pump is sent back to the factory when the bearing wear monitoring device attached to the motor (canned motor) is replaced. In addition, there is an effect that the adjustment can be performed locally and the bearing replacement of the canned motor can be omitted. In addition, by using the adjustment control system according to the present invention, a bearing wear monitoring device suitable for a specific canned motor is manufactured at the factory, and then the detection signal of the detection coil is recorded, and recorded in advance on site. There is an effect that it can be completed including adjustment work by simply exchanging the failed bearing wear monitoring device and the new bearing wear monitoring device using the detection signal.

It is a block diagram of the adjustment control system which adjusts the bearing wear monitoring apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structure of the bearing wear monitoring apparatus which concerns on embodiment of this invention. It is a schematic diagram of the canned motor pump carrying the bearing wear monitoring device concerning this embodiment. It is explanatory drawing explaining the installation condition of the detection coil in the longitudinal cross-section of the canned motor of FIG. 3, and the moving direction of a rotor. FIG. 5 is an enlarged view of a plurality of detection coils and detection coils arranged in the stator of FIG. 4. It is explanatory drawing explaining the state which removed the volt | bolt which has fixed the terminal box of the canned motor of FIG. 3, and electrically connected the bearing wear monitoring apparatus and the adjustment control system. It is explanatory drawing explaining the outline | summary characteristic of the bearing wear monitoring apparatus which concerns on this embodiment. It is explanatory drawing explaining an example of the outline characteristic in the adjustment control system of FIG. It is explanatory drawing explaining the output voltage characteristic of the detection coil at the time of center position adjustment in this embodiment. It is explanatory drawing explaining the output voltage characteristic of the detection coil at the time of center position adjustment in this embodiment. It is a flowchart figure which shows the flow of the adjustment process of the bearing wear monitoring apparatus which concerns on this embodiment. It is a flowchart figure which shows the flow of the preparation process of the reference waveform which concerns on this embodiment. It is a flowchart figure which shows the flow of the process of radial adjustment which concerns on this embodiment. It is a flowchart figure which shows the flow of a process of the thrust adjustment which concerns on this embodiment. FIG. 15 is a characteristic diagram of the front, center, and rear in the flow of thrust adjustment processing of FIG. 14. It is explanatory drawing explaining an example of the LED display based on the characteristic view calculated in FIG. It is a table | surface of the Vrms value calculated | required with the bearing wear monitoring apparatus which concerns on this embodiment. It is a modification of the adjustment control system which adjusts a bearing wear monitoring apparatus.

  Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described with reference to the drawings.

  FIG. 1 shows the configuration of an adjustment control system 40 that adjusts the bearing wear monitoring apparatus 10, and the adjustment control system 40 is outlined with reference to FIG. Since the present applicant refers to the bearing wear monitoring device 10 as “Nikkiso E monitor” (registered trademark), the display unit of the bearing wear monitoring device 10 is referred to as an E monitor in this specification. Usually, the bearing wear monitoring device 10 is connected to a plurality of detection coils attached to the canned motor, calculates the wear amount of the bearing based on a signal detected by the detection coil, and sends the wear amount to the E monitor 30 as a display unit. Is displayed. The E monitor 30 is provided with a bar display of LEDs and a transmitting element 28 and a receiving element 29 for infrared communication in order to display the wear amount.

  The adjustment control system 40 uses the infrared communication of the E monitor 30 to perform digital communication with the bearing wear monitoring device, logging records for capturing signals from a plurality of detection coils attached to the canned motor, and temporarily It has a function of determining a reference waveform from a plurality of logging recorded waveforms, storing the reference waveform as a recorded signal, and reproducing the recorded signal as a pseudo waveform equivalent to logging recording. Here, the reference waveform is a waveform recorded when a newly designed canned motor is completed, and the adjustment control system 40 uses the gain and offset based on the logging waveform at the time of factory shipment of the same type of canned motor based on the reference waveform. Find the adjustment data. The pseudo waveform is adjusted based on the reference waveform and the adjustment data stored at the time of factory shipment, and becomes a waveform equivalent to the waveform at the time of factory shipment. The adjustment control system 40 can simulate the wear state of the bearing without operating the canned motor by outputting a pseudo waveform created from the recorded signal to the bearing wear monitoring device 10.

  In order to realize such a function, the adjustment control system 40 records a reference waveform and various information that are recorded signals necessary for adjustment of the bearing wear monitoring device 10 and a signal from the detection coil. Alternatively, the signal collection / signal generator 42 that outputs a pseudo waveform generated from the reference waveform to the bearing wear monitoring device 10 and the displacement due to the pseudo waveform are acquired from the bearing wear monitoring device and corrected with a known displacement. A correction means, an infrared communication device 41 that performs digital communication with the E monitor 30 of the bearing wear monitoring device 10, a control device 43 that controls these devices, and a user interface 45 that operates the control device 43. Yes. Here, the database 44 records the adjustment data and the waveform data of the reference waveform, and the adjustment data recorded are adjustment parameters at the time of adjustment, numerical data of each coil at the time of adjustment, and the like. These numerical data may be measured values using a function such as a voltmeter.

  The E monitor 30 is a display for displaying the wear in the thrust direction that is the axial direction of the canned motor and the wear in the radial direction that is the radial direction. The display device has three green lights, one yellow light, and one red light constituting the bar display, and a transmission for digital communication with the infrared communication device 41 of the adjustment control system 40 is provided in the vicinity of the bar display. An element 28 and a receiving element 29 are provided.

  Therefore, the adjustment control system 40 obtains the reference waveform from the database 44, creates a pseudo waveform from the reference waveform by the signal collection / signal generator 42, outputs it to the bearing wear monitoring device 10, and is displayed on the E monitor 30. By obtaining information and internal information through digital communication using infrared rays, various situations can be reproduced and the operation of the bearing wear monitoring device 10 can be evaluated. Next, the bearing wear monitoring device will be described in detail.

  FIG. 2 shows the configuration of the bearing wear monitoring apparatus 10. The bearing wear monitoring device 10 includes detection coils C2, C4, C6, and C8 that detect wear in the thrust direction (axial direction) of the bearing, and detection coils C1, C3, C5, and C7 that detect wear in the radial direction (radial direction). An amplifier group for separating a desired signal from a detection signal detected by the detection coil, a signal conversion means 24 for converting the signal into a DC signal by the filter 12, the rectifier circuit 13 and the integration circuit 14, and a signal conversion Center position adjusting means 25 for adjusting the gain and offset of the adjusted DC signal, wear amount converting means 26 for converting the adjusted signal into a wear amount, an LED display 31 for displaying the calculated wear amount, and a control device Accepting and receiving a reference waveform or a pseudo waveform, which is an AC signal of the detection coil, instead of the AC signal detected by the detection means and the communication means 27 for communication with the detection coil It has a 11, a.

  The bearing wear monitoring device 10 is roughly divided into three configurations. The first configuration is detection coils C1 to C8 attached to the stator in order to detect wear in the thrust direction and radial direction of the bearing. The second configuration is an analog circuit such as a filter 12, a rectifier circuit 13, an integration circuit 14, and a subtractor 15 disposed on the substrate of the E monitor 30. The third configuration is a digital circuit such as a CPU 21, RAM 21, ROM 23, and A / D converter 16 that is arranged on the substrate of the E monitor 30 and forms the control unit 20, an infrared transmitting element 28, a receiving element 29, and an LED. This is an interface circuit with the display 31. Next, functions along with the signal flow will be described.

  The signals detected by the detection coils C2, C4, C6, C8 (thrust detection) in the thrust direction and the detection coils C1, C3, C5, C7 (radial detection) in the radial direction are combined by a predetermined combination and received as a combined signal. 11 to the E monitor 30. The receiving means 11 allows the E monitor 30 to receive signals from the detection coils C1 to C8 and outputs the signals to the adjustment control system that records the signals of the detection coils C1 to C8 attached to the canned motor pump. In addition, it is possible to accept the logging records of the detection coils C1-C8 recorded in the adjustment control system. The receiving means 11 in the present embodiment is realized by changing the connector, but the E monitor 30 may be provided with a buffer circuit and a switching circuit so as to eliminate the connector change.

  The signals detected by the detection coils C1 to C8 include a main magnetic flux change (fundamental wave component) of the motor and a magnetic flux change of a rotor bar provided in the rotor (a higher harmonic component having a higher frequency than the fundamental wave component). For this reason, in this embodiment, the signals of the detection coils C1 to C8 are input to the filter 12 to extract the fundamental wave component and the stable harmonic component. The fundamental wave component extracted by the filter 12 is rectified by the rectifier circuit 13 and converted to direct current by the integrating circuit 14 at the subsequent stage.

  Next, the radial detection will be outlined. In the radial detection on the lower left side of FIG. 2, the E monitor 30 converts the analog signals of the detection coils C1 and C3 into digital signals by the A / D converter 16 of the control unit 20. When the rotor moves in the radial direction, the E monitor 30 can make a determination by increasing the difference in harmonic components. Further, since the detection coils C1 and C3 and the detection coils C5 and C7 are independent circuits, the E monitor 30 can detect the uneven wear by comparing the two.

  Next, the outline of thrust detection will be described. In the upper left thrust detection in FIG. 2, the E monitor 30 converts the analog signals of the detection coils C2 and C4 and the detection coils C6 and C8 into digital signals by the A / D converter 16 of the control unit 20. Next, the difference between the signals in the two thrust directions is obtained by the subtractor 15 and converted into a digital signal by the A / D converter 16. When the rotor moves in the thrust direction, the E monitor 30 increases the difference in the fundamental waveform from a state in which there is almost no difference in the fundamental component, and the output voltage rises accordingly, thereby causing wear in the thrust direction. Can be detected. Next, the structure of the canned motor pump will be outlined.

  FIG. 3 shows an outline of a canned motor pump 50 equipped with the bearing wear monitoring device 10. The canned motor pump 50 of FIG. 3 has a pump unit 52 and a motor unit 53 attached to a stand 69, and the pump unit 52 and the motor unit 53 are connected by an adapter 54. The pump part 52 has a suction pipe part 57 and a discharge pipe part 58 communicating with each other in a pump chamber 56 that houses the impeller 55, and the impeller 55 is attached to an extended end part of the shaft 59 of the motor part 53. The shaft 59 is provided with thrust washers 64 and 65 for restricting the movement of the shaft 59 in the front and rear directions. Further, a part of the handling liquid introduced from the discharge pipe portion 58 lubricates the bearings 62 and 63 and cools the motor portion 53, and then is discharged to the suction pipe portion 57.

  The motor unit 53 includes a rotor 66 and a stator 67, and a shaft 59 of the rotor 66 is rotatably supported by a front bearing 62 and a rear bearing 63. In addition, the stator 67 has motor windings 72 and detection coils (C1, C2) provided at both ends of the stator 67 for detecting displacement of the rotor due to bearing wear. The motor winding 72 is connected to a terminal box 71 provided at the end of the canned motor pump 50 through a terminal terminal 68, and a bearing for monitoring the wear state of the bearing and displaying the contents at the upper part of the terminal box 71. A wear monitoring device 10 and an E monitor 30 are attached.

  FIG. 4 shows the installation state of the detection coils C1, C3, C5, and C7 and the moving direction of the rotor 66 in the longitudinal section of the canned motor pump 50 of FIG. Here, the description of the configuration already described is omitted. As shown in FIG. 4, the detection coils C1, C3, C5, and C7 are arranged so as to face each other at both ends in the longitudinal direction of the stator 67 with an interval of 180 degrees. By combining (combining) these detection coils, the displacement in the front / rear direction can be detected as shown in the enlarged view on the right side of FIG. The detection coil does not directly detect the wear of the bearing. For example, as shown in the enlarged view on the left side of FIG. 4, the interval (L1) between the bearing 63 provided on the shaft 59 and the thrust washer 65 is widened by the wear. A displacement in the thrust direction is detected by a detection coil attached to the stator 67. Similarly, the detection coil detects a displacement in the radial direction due to an increase in the distance (L2) between the shaft sleeve 75 and the bearing 63 due to wear.

  FIG. 5 shows an enlarged view of a plurality of detection coils C1 to C8 and a predetermined detection coil C3 arranged in the stator 67 of FIG. As shown in the drawing, the displacement in the radial direction (radial direction) on the front side can be detected by the detection coils C1 and C3, and the displacement in the radial direction on the rear side can be similarly detected by the detection coils C5 and C7. . Further, the displacement in the thrust direction (axial direction) can be detected by the combination of the detection coils C4 and C2 and the detection coils C8 and C6. The detection coil C3 has a flat bobbin shape, and is fitted into a notch provided in the iron core tooth portion 61 at the end of the stator 67 as shown in the enlarged view of FIG.

  The shaft of the canned motor pump of this embodiment has a play of about ± 1 mm in the axial lateral thrust direction. Therefore, the control unit 20 receives the three types of position information of the center, the front, and the rear from the external controller through the communication unit 27, and executes the center position adjusting unit 25 based on the signals of the detection coils C1 to C8. The mechanical center and the magnet center can be matched. Thereafter, the control unit 20 obtains the wear in the radial direction and the wear in the thrust direction by the wear amount conversion means 26 based on the signal adjusted by the center position adjusting means 25, and displays the wear in each direction on the LED display 31. .

  FIG. 6 shows a state where the bolts fixing the terminal box 71 of the canned motor of FIG. 3 are removed and the bearing wear monitoring device 10 and the adjustment control system 40 are electrically connected. FIG. 6 is roughly divided into three parts. The first is a terminal box 71 that accommodates the terminal terminal 68 of the canned motor, the second is a casing 87 that is mounted on the terminal box 71 with bolts, and the third is a casing 87 that is mounted on the casing 87. The infrared communication device 41 and the control device 43. The housing 87 accommodates the bearing wear monitoring device 10 including a transformer 84 and a plurality of printed circuit boards 83, and the display plate 85 can be viewed from the glass window 86 at the top of the housing. An LED display 31 for displaying the wear state, a transmitting element 28 for communicating with the adjustment control system 40, and a receiving element 29 are attached to the display board 85.

  A stator coil terminal 73 and a detection coil terminal 74 are attached to a glass sealed terminal plate 81 on the terminal terminal 68, and a power cable 77 is connected to the stator coil terminal 73. Further, the power cable 77 extends outside the terminal box 71 through the wire insertion hole 82. On the other hand, a signal line 76 extending from the detection coil terminal 74 is connected to the printed board 83 of the bearing wear monitoring apparatus 10. The detection coil terminal 74 is connected to a probe 88 for recording a detection coil signal. The probe 88 incorporates a high impedance circuit in order to collect signals efficiently.

  FIG. 7 shows an outline characteristic of the bearing wear monitoring device, and shows an output with respect to a signal input by the adjustment control system. The adjustment control system acquires the detection signal (AC signal) of the detection coil at each thrust position of the front, center, and rear positions as a logging record by the receiving means of the bearing wear monitoring device. A standard waveform is recorded in the database as a detection coil signal file serving as a reference waveform. In the detection coil signal file, the thrust position and the signal waveform of the magnetic field due to the rotation detected by the detection coil are recorded. It is empirically known that the output level of this detection coil signal file varies depending on the characteristics of the motor, but falls within a predetermined range if the canned motor has the same type and type. Therefore, in the present embodiment, a detection coil signal file serving as a reference waveform is created, a difference in gain from logging recording is measured, and a “reference waveform” and a “gain coefficient” are combined. With this combination, instead of managing the recording waveforms such as the center position, front position, and rear position for each canned motor, the “reference waveform” and “adjustment data” are managed so that the data amount is reduced. In this embodiment, a “gain coefficient” indicating a gain difference from logging recording is applied based on the recording waveform of the center position, the front position, and the rear position that becomes the “reference waveform” for each type and type of the canned motor. Thus, a pseudo waveform is created from the reference waveform, and the database 44 is prevented from being enlarged due to an increase in the detection coil signal file such as logging recording.

  The factor to be adjusted by the adjustment control system is the amplifier characteristic of the bearing wear monitoring device. The detection coil characteristic recorded in the detection coil signal file is the detection coil output (vertical axis) with respect to the thrust position (horizontal axis), and the amplifier output (vertical axis) with respect to the detection coil output (horizontal axis) to correct the amplifier characteristics. ) Is created and written as correction information to the bearing wear monitoring device, and the bearing wear monitoring device can output the thrust position based on this correction information.

  In the bearing wear monitoring apparatus of the present embodiment, the fundamental wave component and the harmonic component detected by the detection coil in the signal conversion means are converted into a direct current rms value and A / D converted, thereby realizing a circuit cost reduction. ing. Since an analog circuit and a plurality of operational amplifiers are used for the signal conversion means of the bearing wear monitoring device, the characteristics are slightly different for each device due to these amplifier characteristics. Furthermore, since the detection signal of the detection coil also has different characteristics for each detection coil, it is necessary to correct the characteristics of the detection coil and the amplifier characteristics for each apparatus.

  FIG. 8 shows an example of the outline characteristics of the bearing wear monitoring device of FIG. 7, showing the thrust position corresponding to the detection coil characteristics and the output of the detection coil, and the combined characteristics of the detection coil and amplifier characteristics in solid lines. The corrected thrust position characteristic is indicated by a broken line. As shown in this figure, since the combined characteristics of the detection coil specification and the amplifier characteristics are affected, in order to obtain an accurate thrust position characteristic, correction is made in consideration of the characteristics of the detection coil and the amplifier characteristics of the E monitor. There is a need.

  In general, when replacing the bearing wear monitoring device, replace the bearing with a new one so that the canned motor is at the mechanical center position (mechanical center). It is necessary to perform zero point adjustment so that the center position (magnet center) by the detected magnetic field coincides. Therefore, in the bearing wear monitoring apparatus according to the present invention, the play of the new bearing is ± 50% from the mechanical center, the AC signal detected by each detection coil is recorded (logging recording), and the recorded AC signal (logging) We decided to correct the magnet center using (Record). By using such a method, it is only necessary to replace the bearing wear monitoring device, and the working efficiency is improved.

  9 and 10 show the detection coil output voltage characteristics when the center position is adjusted. Hereinafter, the center position adjustment using the reference waveform in the replacement of the bearing wear monitoring device will be outlined. FIG. 9 shows an example of the detection coil output voltage before center position adjustment, the solid line indicates the output of the detection coils C2 and C4, the broken line indicates the output of the detection coils C6 and C8, and the amplifier characteristics of the E monitor and the detection coil A state in which the mechanical center and the magnet center are displaced due to the combined characteristics with the detection coil characteristics is shown. As shown in FIG. 9, if the mechanical center and the magnet center are misaligned, the difference exceeds an adjustable allowable value. Therefore, in order to match the mechanical center and the magnet center, reference waveforms at the front, center, and rear positions are used. Use to adjust the center position. FIG. 10 shows a state in which the mechanical center and the magnet center are made to coincide by adjusting the center position, which will be described later. By matching the mechanical center and the magnet center, the difference can be adjusted and the wear monitoring accuracy can be maintained. The center position adjustment is a part of the adjustment process of the bearing wear monitoring device, and the adjustment process includes gain setting, threshold value adjustment and the like in addition to the center position adjustment. Next, the flow of adjustment processing will be described in detail.

  FIG. 11 shows the flow of adjustment processing (main routine) of the bearing wear monitoring device, and shows the processing of the adjustment control system of FIG. As shown in FIG. 11, adjustment processing includes reading adjustment data and waveforms (S10), using waveform at the center position (S12), radial adjustment at the center position (S14), using waveforms at the front, center, and rear positions (S16). ), Thrust adjustment at the front, center and rear positions (S18), verification test (S20), and memory storage (S22). The database 44 in FIG. 1 is a database relating to manufacturing and maintenance of a canned motor that records adjustment data and waveform data, and records adjustment parameters such as a canned motor type, operating voltage, pump lift amount, and gain setting at the time of manufacturing. doing. The processing flow will be described below using the main routine of FIG. 10 and the subroutines of FIGS.

  When the adjustment process (main routine) of FIG. 11 is started, the control device 43 receives a manufacturing number for identifying the individual bearing wear monitoring device (canned motor pump) to be replaced in step 10 from the operator. When the control device 43 receives the production number, a work area associated with the production number is secured. Next, the control device 43 executes a waveform data reading subroutine of step S11. As shown in FIG. 12, this process is a waveform reading (subroutine) for a reference waveform preparation process, reads adjustment data associated with a serial number, determines a reference waveform from the adjustment data, and accesses the database. In step S30, an inquiry is made as to whether or not the corresponding file exists. If there is such a file, the database is accessed in step S32, the reference waveform is read in step S36, and the reference waveform is stored in the memory in step S38.

  If the corresponding file is not found in step S30, the operator is notified that there is no corresponding file for the normal specification motor, and a step is performed to confirm whether the reference waveform of the equivalent product may be used. The process of reading from another medium in S34 is executed. Since the reference waveform of the special specification motor is different from the reference waveform of the normal specification motor, the data is not automatically downloaded, and the operator downloads it from another medium as necessary.

  The stored reference waveform is not a single waveform, but a plurality of waveforms necessary for center position adjustment are described in a predetermined wfs format. The wfs format has a plurality of fields such as the waveform data of the front detection coil and the rear detection coil at a position where the fluid is equilibrated during pump operation. The control device 43 stores the reference waveform in the memory, and when step S38 ends, the control device 43 returns to step S11 of the main routine of FIG. 11, and proceeds to step S12.

  Step S12 in FIG. 11 is confirmation processing related to waveform reading for performing radial adjustment using the reference waveform at the center position. The file name in the wfs format is created by combining information necessary for motor frame, voltage, frequency, and center position adjustment. After confirming the file to be used, the process proceeds to the radial adjustment (subroutine) in step S14.

  FIG. 13 shows the flow of the radial adjustment subroutine. Step S40 is a pseudo waveform generation process. The pseudo waveform is obtained by multiplying a reference waveform by a gain coefficient, and the gain coefficient is expressed by the following equation. The gain waveform is: gain coefficient = detection coil output voltage of adjustment data / detection coil voltage of reference waveform (Equation 1). From this, the pseudo waveform is pseudo waveform = gain coefficient * reference waveform (Equation 2), which is a waveform in which the reference waveform is close to the actual output voltage of the detection coil.

  FIG. 17 shows the voltage values (logging records) between the rear coil and the front coil in the thrust direction and radial direction at the rear, center, and front positions obtained by the bearing wear monitoring device. For example, when the detection coil output voltage of logging recording at the center position and radial direction rear coil in FIG. 17 is 0.04 Vrms, and the detection coil voltage of the reference waveform is 0.02 Vrms, the gain coefficient is expressed by the equation 1 to 0.04 / 0.02 = 2.0. Therefore, the pseudo waveform can generate the same waveform as the logging recording from the 2.0 * reference waveform. That is, only by calculating the reference waveform and the gain coefficient (2.0), it is not necessary to manage enormous logging records for each canned motor, and the storage capacity can be reduced. In other words, by storing a standard reference waveform and storing only adjustment data for each canned motor, a pseudo waveform close to logging recording can be created.

  When the generation of the pseudo waveform is completed in step S40 of FIG. 13, the pseudo waveform is output from the signal acquisition / signal generator 42 of FIG. 1 to the E monitor 30 (step S42). The E monitor 30 calculates an rms value from the acquired pseudo waveform (step S44). The E monitor 30 stores the rms value in the memory together with the center position information received by the digital communication by the infrared communication device 41 in step S46 (step S46), ends the subroutine, returns to step S14 in FIG. 11, and returns to step S16. Move on.

  Step S16 in FIG. 11 is a confirmation process related to waveform reading for performing radial adjustment using a reference waveform corresponding to logging recording of front, center, and rear positions for thrust adjustment. This confirmation process is a process for reading a necessary waveform from the database in the same manner as in step S12 described above. When the confirmation processing in step 16 is completed, the process proceeds to thrust adjustment (subroutine) in step S18.

  FIG. 14 shows the flow of front, center and rear position adjustment processing in the flow of thrust adjustment (subroutine). In the radial adjustment (subroutine) described above, since there is almost no difference in the detected coil voltage at the front and rear positions, processing is performed using the pseudo waveform at the center position shown in FIG. The difference is that whether the rear position is within a predetermined numerical range including the rms value is verified. Hereinafter, step S50 to step S60 in FIG. 13 will be described in detail.

  In step S50 of the thrust adjustment subroutine of FIG. 14, the control device 43 of FIG. 1 generates a pseudo waveform by applying a gain coefficient to the reference waveform in order to generate a pseudo waveform for each of the front, center, and rear positions. Here, although the value of the wfs format is used as the gain coefficient, a method for calculating the gain coefficient will be described.

  In the table of FIG. 17 (front position in the thrust direction), for example, since the detection coil voltage rms of the reference waveform is 0.9 Vrms, the gain coefficient of the rear coil is 0.97 / 0.9 = 1.07. The gain coefficient of the front coil is 0.92 / 0.9 = 1.02. The controller 43 uses these gain coefficients to generate a pseudo waveform from the rear side and front side reference waveforms. Next, in step S52, the control device 43 outputs the generated pseudo waveform from the signal collection / signal generator 42 to the E monitor 30, and proceeds to step S54. In step S54, the E monitor 30 calculates a rear coil rms-front coil rms value from the pseudo waveform and transmits it to the control device 43 by digital communication of an infrared communication device. The control device 43 receives each rms value and executes step S56.

  In step S56, each rms value at the front, center, and rear positions is play by a new bearing. Therefore, this distance is set to 50% of the moving distance at the time of wear, and the control device 43 sets the rms at the time of 100% wear. Calculate the value. Here, FIG. 15 shows the front, center, and rear characteristics in the thrust adjustment processing flow of FIG. 14, and the rms values shown in FIG. 17 are displayed at the front, center, and rear positions. The allowable error range at the front and rear positions in FIG. 15 is set within ± 5%, and the allowable error range at the center position is set within ± 3%. This is because the rms value at the time of 100% wear is calculated based on this value, and therefore, accurate wear monitoring is difficult if the allowable error is exceeded. Further, the rms value on the front side in FIG. 15 is displayed with the polarity reversed on the display. The reason for this is to reduce the display graph area and to realize space saving when displaying the graph on the user interface.

  FIG. 16 shows an example of LED display on the E monitor 30 based on the characteristic diagram calculated in FIG. In step S56 of FIG. 14, the rms value at the time of 100% wear is calculated based on the rms value at the position where the movement distance is 50%. Normally, one green light is always on when the moving distance is within 50%. Hereinafter, lighting conditions from 2 green lights to 1 red light will be described. Two green lights are lit when the travel distance exceeds 50% and less than 67%, three green lights are lit when the travel distance exceeds 67% and less than 88%, and one yellow light is lit when the travel distance is 88%. It lights when it exceeds 100% and becomes 100% or less, and one red light lights when the moving distance exceeds 100%. As described above, since the lighting condition is obtained as the rms value corresponding to the moving distance, the control device 43 stores each rms value in the memory of the E monitor by infrared communication in step S58 of FIG. In step S60, the control device 43 executes the above processing at the front, center, and rear positions, and repeats it until it is finished. When each process is completed, step S60 is ended, the process returns to step S18 of step S20 in FIG. 11, and the process proceeds to the verification subroutine of step S20.

  In step S20 of FIG. 11, the control device 43 notifies the operator that a series of setting processes has been completed, and a pseudo signal for sequentially lighting the LED displays of the E monitor 30 is output to the E monitor 30 for verification. Run the test. By this verification test, it is possible to easily determine whether or not the setting of the E monitor 30 has been normally executed. After completing the verification test in step S20, the control device 43 moves to step S22, stores the set information in the E monitor 30, and stores necessary information in the database 44 from the control device 43. With the above processing, the processing of the main routine ends.

  FIG. 18 shows a modified example of the adjustment control system for adjusting the bearing wear monitoring device (E monitor 30) of FIG. 1, and shows the state of the production line in the networked factory. In the adjustment control system 60, the database 44, the control device 43, and the signal reproduction / input devices (46, 47) are connected to each other through a LAN to improve the information transmission capacity. In the present embodiment, by using the signal regenerator / collector (46, 47) by an independent measuring instrument, it becomes possible to disperse the processing and to freely arrange in the factory. Unaffected by processing power. Further, in the bearing wear monitoring device (E monitor 30) according to the present embodiment, adjustment data of the detection coil at the time of manufacturing the canned motor pump is important, and the E monitor 30 that can hold various information related to the canned motor pump. In addition, it is possible to incorporate further quality improvement functions.

  As described above, by using the bearing wear monitoring device and the adjustment method of the bearing wear monitoring device according to the present embodiment, it is possible to separately perform the replacement of the bearing and the replacement of the bearing wear monitoring device. . Also, by using an adjustment control system, after manufacturing a bearing wear monitoring device suitable for a specific canned motor pump at the factory, it is possible to complete the adjustment work by simply replacing the failed bearing wear monitoring device at the site. This makes it possible to reduce the work man-hours and to perform a quick replacement work. In this embodiment, in order to realize effective management of recorded signals, logging recording, reference waveform, gain coefficient, pseudo waveform, and the like are used. However, the present invention is not limited to such an embodiment, and further, An effective management method may be adopted. In FIG. 1 of the present embodiment, the signal acquisition / signal generator 42 is used. However, when the reference waveform and the coefficient are recorded in the database 44, the signal acquisition function is omitted. Needless to say, it can be built with a single function.

  DESCRIPTION OF SYMBOLS 10 Bearing wear monitoring apparatus, 11 Acceptance means, 12 Filter, 13 Rectifier circuit, 14 Integration circuit, 15 Subtractor, 16 A / D converter, 20 Control part, 24 Signal conversion means, 25 Center position adjustment means, 26 Amount of wear Conversion means, 27 Communication means, 28 Transmitting element, 29 Receiving element, 30 Monitor, 31 Display, 40 Adjustment control system, 41 Infrared communication device, 42 Signal collection / signal generator, 43 Control device, 44 Database, 45 User interface , 46, 47 Signal regeneration / collector, 50 canned motor pump, 52 pump section, 53 motor section, 54 adapter, 55 impeller, 56 pump chamber, 57 suction pipe section, 58 discharge pipe section, 59 shaft, 60 adjustment control system 61 iron core teeth, 64, 65 thrust washers, 66 rotors, 67 Stator, 68 terminal terminal, 69 stand, 71 terminal box, 72 motor winding, 73 stator coil terminal, 74 detection coil terminal, 75 shaft sleeve, 76 signal line, 77 power cable, 81 glass sealed terminal plate, 82 wire insertion hole , 83 Printed circuit board, 84 transformer, 85 display board, 86 glass window, 87 housing, 88 probe, C1-C8 detection coil.

Claims (5)

The magnetic flux change corresponding to the mechanical positional change in the thrust direction or the radial direction of the motor rotor provided in canned motor pump detected by the plurality of detection coils installed in the stator, are output from the detection coil a detection signal indicative of the flux changes, the adjustment control system to adjust the bearings wear monitoring equipment that converts the amount of wear of the bearing for rotatably supporting said rotor,
The bearing wear monitoring device includes a detection signal indicating the magnetic flux change output from the detection coil when the motor is driven, and a thrust direction and a radial direction of the rotor when the detection signal indicating the magnetic flux change is obtained. It has a zero point adjustment function that adjusts the zero point according to the mechanical position in the direction.
The adjustment control system includes:
Communication means for communicating with the bearing wear monitoring device;
Detection indicating the magnetic flux change obtained when the mechanical position of the rotor is set to a specific thrust direction position and a radial position instead of a detection signal indicating the magnetic flux change actually detected by the detection coil. Output means for outputting a pseudo signal imitating a signal to the bearing wear monitoring device via the communication means ;
And causing the bearing wear monitoring device to perform the zero point adjustment based on the pseudo signal,
An adjustment control system characterized by that. The adjustment control system according to claim 1, further comprising:
The change in magnetic flux output from the detection coil when the canned motor pump is driven with the mechanical position of the rotor at a specific thrust direction position and radial position before shipment of the canned motor pump. A signal recording means for taking out a detection signal indicating and recording as a logging signal;
Management means for managing the recorded logging signal for each identification ID of the canned motor pump ;
I have a,
The adjustment control system, wherein the output means of the adjustment control system outputs the recorded logging signal as the pseudo signal to the bearing wear monitoring device . The adjustment control system according to claim 1, further comprising:
A reference waveform that is a standard waveform, and a gain coefficient that indicates an amplitude ratio between the signal waveform of the detection signal indicating the magnetic flux change actually output from the detection coil of the corresponding canned motor pump and the reference waveform. Storage means for storing;
Means for generating a pseudo signal corresponding to the bearing wear monitoring device to be adjusted based on the reference waveform stored in the storage means and the gain coefficient;
Adjustment control system comprising: a. Detected by the plurality of detection coils disposed magnetic flux change corresponding to the mechanical positional change in the thrust direction or the radial direction of the motor rotor provided in canned motor pump stator, and detected by the detection coil and the In an adjustment method for adjusting a bearing wear monitoring device that converts a detection signal indicating a magnetic flux change into a wear amount of a bearing that pivotally supports the rotor ,
Detection indicating the magnetic flux change obtained when the mechanical position of the rotor is set to a specific thrust direction position and a radial position instead of a detection signal indicating the magnetic flux change actually detected by the detection coil. An input step of inputting a pseudo signal imitating a signal to the bearing wear monitoring device;
Causing the bearing wear monitoring device to perform zero point adjustment based on the pseudo signal and the specific thrust direction position and radial direction position;
A method for adjusting a bearing wear monitoring apparatus, comprising: In the adjustment method of the bearing wear monitoring apparatus according to claim 4, further comprising:
Before shipping the canned motor pump, the magnetic flux change output from the detection coil when the canned motor pump is driven in a state where the mechanical position of the rotor is at a specific thrust direction position and radial position. A signal recording step of taking out the detection signal shown and recording it as a logging signal;
Management means for managing the recorded logging signal for each identification ID of the canned motor pump ;
Only including,
The method for adjusting a bearing wear monitoring apparatus, wherein the input step inputs the recorded logging signal as the pseudo signal to the bearing wear monitoring apparatus.

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