JP3581951B2 - Motor bearing wear monitoring device - Google Patents

Description

[0001]
[Industrial applications]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor bearing wear monitoring device for monitoring wear of a shaft bearing included in a motor, and more particularly to a motor bearing capable of remotely controlling a detection signal from the motor detected for monitoring the bearing. The present invention relates to a wear monitoring device.
[0002]
[Prior art]
Since canned motors as an example of motors are generally used in plants as pump motors and are required to have high reliability, a device that externally monitors the wear of the bearings that support the rotor is indispensable. ing. Conventionally, as this type of bearing wear monitoring device, for example, as shown in FIG. 6, a terminal box 102 provided in an upright state at an end of a canned motor main body 101 and an upper surface opening 102a of the terminal box 102 are provided. And a lid 103 to be closed.
[0003]
The terminal box 102 is formed in a substantially cylindrical shape, and a terminal plate 104 is provided therein. A plurality of terminals extending in the thickness direction (axial direction of the terminal box 102) are embedded in the terminal plate 104. ing. The other ends of the terminals of the terminal plate 104 are on the side of the canned motor main body 101, the other end of which is a motor coil (not shown), a thermostat for temperature detection, and a detection coil for detecting a wear state of a bearing in the canned motor main body 101. One end of the wire connected to the terminal box 102 is connected to the terminal box 102, and an external power line 108 (power cable) or the like drawn from the wire insertion hole 110 in the outer peripheral wall of the terminal box 102 is provided on the upper surface opening 102a side of the terminal box 102. It is connected.
[0004]
The lid 103 is provided with a printed circuit board on which a processing circuit for processing a signal corresponding to the wear state of the bearing is mounted, an indicator for displaying the wear state of the bearing processed by the printed board, and processed by the printed circuit board. An adjustment semi-fixed resistor or the like for performing gain adjustment such as signal zero setting is provided. Further, a glass window 106 is formed on the upper surface of the lid 103 so that the indicator can be visually recognized from the outside, so that an operator can visually check the wear state of the bearing.
In addition, the cover 103 was attached to the terminal box 102 by inserting bolts 105 into a plurality of bolt holes formed in the flange at the lower end of the cover 103 and screwing it into the upper end of the terminal box 102.
[0005]
[Problems to be solved by the invention]
However, in the above conventional device, since the terminal box 102 is sealed by the lid 103, in order to perform gain adjustment such as setting of a zero point of a signal processed on a printed circuit board, all bolts are removed and the lid 103 is removed. After removal, it was necessary to turn the adjustment semi-fixed resistor with a driver while energizing the motor and the bearing wear monitoring device. Furthermore, after the adjustment, it is necessary to attach the lid 103 to the terminal box 102 again with bolts, and the adjustment operation is extremely difficult and troublesome.
[0006]
Further, when the canned motor is installed in the exposure area, it is necessary to move the canned motor to the non-exposure area or remove explosive gas around the motor before the above-described series of operations. In this case, since a long time is required for the operation, there is a problem that it is necessary to consider an adjustment operation time.
In order to solve the above problems, the present invention provides a workability for adjusting a detection signal by remotely adjusting a gain of a detection signal from a motor detected for monitoring a bearing such as a zero point setting . It is an object of the present invention to provide a motor bearing wear monitoring device capable of improving motor wear.
[0007]
[Means for Solving the Problems]
The present invention is configured as follows to achieve the above object. That is, the invention according to claim 1 is a bearing wear monitoring means for monitoring the wear of the bearing by processing a detection signal from a motor having a bearing for rotatably supporting the shaft, and monitoring by the bearing wear monitoring means. display means for displaying the state of wear of the bearings which are, together may adjust the detection signal detected by the bearing wear monitoring means, and adjusting means for transmitting a signal adjusted to said display means, said bearing wear monitoring means , A display means, and an adjustment means, which are hermetically housed therein, and a protection cover in which a see-through window is formed partially so that the display means can be visually recognized. through said transparent window, characterized by comprising a remote control means for causing at remotely control the zeroing such gain adjustment of the detection signal by the adjustment means from.
According to such a configuration, with respect to the detection signal detected by the bearing wear monitoring means, for zero-setting, etc. gain adjustment by remote control by the remote control unit through the transparent window from the outside of the protective cover.
[0008]
The invention according to claim 2 is characterized in that the motor is a canned motor having a bearing rotatably supporting a shaft connected to an impeller.
According to this configuration, the wear of the bearing that rotatably supports the shaft connected to the impeller is monitored.
The invention according to claim 3 is characterized in that the remote control means has a light receiving element for receiving an optical signal emitted from outside the protective cover.
According to this configuration, a command signal for adjusting the detection signal is transmitted from the outside of the protective cover as an optical signal, and the optical signal is received by the light receiving element to adjust the detection signal.
The invention according to claim 4 is characterized in that the remote control means has a light emitting element for transmitting an optical signal to the outside of the protective cover.
According to this configuration, the detection signal and the set value detected by the bearing wear monitoring unit are transmitted to the outside of the protective cover by the light emitting element, and the detection signal and the set value can be confirmed from the optical signal.
[0009]
Embodiment
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, a configuration for monitoring the wear of the bearing in the motor will be described with reference to FIGS. 5 (a) and 5 (b).
In the canned motor applied in the present embodiment, the shaft 54 connected to the impeller of the pump section is supported at two places near the end points thereof, and forms the rotor 54 together with the rotor. Detection coils 52a and 52b are attached over the entire circumference in the longitudinal direction of each core tooth at a position 180 degrees opposite to the iron core of the stator 51 as a stator, and the outputs of the detection coils 52a and 52b are differential. In such a manner as to monitor the detection signal.
[0010]
The voltage induced in the detection coils 52a and 52b by the rotation of the rotor 54 is obtained by superimposing a harmonic voltage under the influence of the rotor groove 54a on a fundamental voltage synchronized with the power supply frequency, but at 180-degree intervals. Since the outputs of the installed detection coils 52a and 52b are connected so as to be differential, the fundamental wave voltage is eliminated and the difference between the instantaneous values of the harmonic voltage is displayed as a detection signal. Therefore, when the bearings wear and the distances d1 and d2 between the stator 51 and the rotor 54 change (that is, when the bearings wear and the rotor 54 moves in the radial direction), the harmonics of the detection coils 52a and 52b are increased. The voltage is transmitted as a differential output corresponding to the change to the bearing wear monitoring device and displayed.
[0011]
Further, although not shown, two detection coils 52a and 52b for detecting the radial direction and two detection coils for detecting the axial direction are respectively opposed to both ends in the longitudinal direction of the stator core teeth at intervals of 180 degrees. The detection coils installed at both ends are also differentially output-connected in the same manner as the detection coils 52a and 52b, so that even when the bearings are worn and the rotor 54 moves in the thrust direction, the movements can be dealt with. The detection signal is transmitted to the bearing wear monitoring device and displayed.
[0012]
Next, a bearing wear monitoring device according to the present embodiment will be described.
1 and 2, a bearing wear monitoring device 1 is detachably attached to a substantially cylindrical terminal box 2 (junction box) and four bolts 4 so as to close an upper opening 2 a of the terminal box 2. And a cover 3 which forms a protective cover. In the terminal box 2, a glass terminal plate 5 is fixed in the lower surface opening 2 b by four screws 6, and a plurality of terminals 7 are attached to the terminal plate 5, and upper and lower ends of the terminal plate 5 are connected to the terminal plate 5. The central portion is embedded in the terminal plate 5 so as to protrude from both surfaces in the thickness direction by a predetermined dimension.
[0013]
A wire insertion hole 8 having, for example, three screw portions communicating with the inside and outside of the terminal box 2 is provided at a predetermined location on the outer peripheral wall surface 2c of the terminal box 2. Grommets 9 made of an appropriate material capable of sealing the inside of the box 2 are screwed. An upper portion of the terminal flange 10 is fixed to the lower surface opening 2b of the terminal box 2, and a lower portion of the terminal flange 10 is fixed to the outer peripheral wall of the canned motor main body 11 by welding or the like. Are arranged upright on the canned motor main body 11.
[0014]
The terminal 7 in the terminal box 2 is formed in a bolt shape, and male screws 7a and 7b are formed at upper and lower ends thereof, and a pair of nuts 13 and 14 are respectively screwed into the male screws 7a and 7b. Have been combined. The male screw 7b on the lower end side of the terminal 7 has an internal lead wire 15a connected to a thermostat (not shown) inside the canned motor main body 11 and an internal power supply wire 16a connected to a coil (not shown). Multiple wires are connected. An external lead wire (not shown) drawn into the terminal box 2 from the electric wire insertion hole 8, an external power supply line 16 b (power supply cable), or the cover 3 is provided in the male screw 7 a on the upper end side of the terminal 7. Are connected to the signal line 17 and the like.
[0015]
The male screw 7a, 7b of the terminal 7 is connected to each wire by removing the nut 13 and inserting the hole of the crimp terminal 18 fixed to the end of each wire through the male screw 7a, 7b. This is performed by screwing the nut 13 into the nuts 7a and 7b and tightening the crimp terminal. The crimp terminal 18 is sandwiched and fixed between the pair of nuts 13 and 14 and is electrically connected to each terminal 7.
A lid locking pin 19 is embedded in an end surface 2d of the terminal box 2 on the side opposite to the electric wire insertion hole 8 of the upper surface opening 2a serving as a contact portion with the lid 3. The lid locking pin 19 is set to have a length that penetrates a through hole 20 of the lid 3 described later and protrudes upward by a predetermined length, and connects a male screw 19b at the lower end thereof to the upper opening 2a of the terminal box 2. Is screwed (or driven) into the screw hole 21 (or hole) provided in the first hole. A male screw 19a is formed on the upper part of the lid locking pin 19.
[0016]
Here, by providing the through hole 20 of the lid 3 to be engaged with the lid locking pin 19 on the end face 3 d on the outer peripheral wall surface 3 c side of the lid 3, the lid 3 is attached to the lid locking pin 19. When engaged, the lid 3 can be held in a state of being aligned with the outer peripheral wall surface 2c of the terminal box 2, so that the wiring of the signal line 17 at the time of maintenance work such as replacement of the printed circuit board 24 to be described later is performed. The rotation of the lid 3 is restricted within a predetermined range by the contact between the outer peripheral wall 3c of the lid 3 and the outer peripheral wall 2c of the terminal box 2, so that the holding state of the lid 3 can be improved. It is possible to stably improve the workability of wiring work.
[0017]
On the other hand, the box body 3 for closing the upper opening 2a of the terminal box 2 is formed in a substantially cylindrical shape, and serves as display means for displaying the wear state of the bearing in the canned motor main body 11 on the upper opening 3a side. A display panel 23 is provided. A plurality of LEDs (light emitting diodes) 31 that are turned on in response to the thrust and radial wear of the bearing are disposed below the display plate 23. The display plate 23 transmits light of the LEDs 31. And configured to indicate wear of the bearing. In addition, a glass window 30 made of tempered glass is formed on the upper surface of the lid 3 so that the wear state of the bearing displayed on the display plate 23 can be visually recognized.
[0018]
A printed board 24 is provided below the display board 23. The printed circuit board 24 is composed of an upper stage, a middle stage, and a lower stage as shown in the figure, and these three printed circuit boards 24 are electrically connected by connectors (not shown). On the printed circuit board 24, a processing circuit 36 (see FIG. 4) constituting a bearing wear monitoring means for monitoring bearing wear based on a detection signal from a detection coil of a canned motor, a transformer 25, and the like are mounted. The middle printed circuit board 24 is provided with a plurality of connectors 26 as input terminals.
The lower surface opening 3b of the lid 3 is closed by a plate 27 fixed by a screw (not shown), and a signal line insertion hole 28 is formed at an appropriate position of the plate 27 to communicate inside and outside. For example, a multi-core cable is used as the signal line 17, one end of which is connected to the connector 26 provided on the printed circuit board 24, and the other end of which is connected to the terminal 7 of the terminal box 2.
[0019]
The signal line insertion hole 28 of the plate 27 is filled with a resin 29 for hermetically sealing the inside of the lid 3 and preventing the signal line 17 from moving. The portion on the terminal box 2 side with respect to the plate body 27 is set to have a predetermined slack. The through hole 20 penetrating in the vertical direction is formed in an end face 3d of the outer peripheral portion of the lower surface opening 3b which is a contact portion of the lid 3 with the terminal box 2, and the through hole 20 is usually formed in the through hole 20. The protrusion of the stop pin 19 is inserted.
[0020]
Here, in the bearing wear monitoring device 1 according to the present invention, the remote control means for remotely adjusting the detection signal detected by the detection coil through the glass window 30 from the outside of the terminal box 2 and the cover 3. A light emitting element 32 and a light receiving element 33 are provided. The light emitting element 32 and the light receiving element 33 are disposed in the vicinity of the LED 31, and are received on the glass window 30 side by the light emitting element hole 32 a and the light receiving element hole 33 a formed in the display panel 23, as shown in FIG. It is arranged with the light emitting surfaces facing each other. The transmission window may be formed by covering the light emitting element hole 32a and the light receiving element hole 33a with a transmission material (transparent resin, glass, or the like).
Reference numerals 31a and 31b in the figure are a plurality of transmission windows through which the light of the LED 31 is transmitted, and reference numeral 31c is printed on the display panel 23 and indicates a wear level of the bearing. For example, by displaying the wear in the thrust direction of the bearing in the transmission window 31a and the wear in the radial direction of the bearing in the transmission window 31b, the wear state of the bearing in two directions can be displayed.
[0021]
As shown in FIG. 4, the light emitting element 32 and the light receiving element 33 are respectively connected to an IC 35 as an adjusting means in a processing circuit 36, and a memory and an LED 31 are connected to the IC 35. When an optical signal emitted from an external device 34 such as a personal computer is received by the light receiving element 33 through the glass window 30, the optical signal is converted into an electric signal and transmitted to the IC 35. The IC 35 adjusts the detection signal from the detection coil based on the transmitted signal, transmits the signal of the wear state of the bearing, for which the gain adjustment including the zero point adjustment has been performed, to the LED 31 and determines the signal by this adjustment. The set value is stored in the memory.
[0022]
Further, the setting value stored in the memory is transmitted as an electric signal to the IC 35 and the light emitting element 32. The light emitting element 32 converts the electric signal into an optical signal, and then transmits the optical signal to an external device 34 such as a personal computer. By receiving this optical signal by the external device 34 such as a personal computer through the glass window 30, information such as what kind of adjustment is made to the bearing wear monitoring device 1 and what set value is obtained is obtained. Can be.
According to the bearing wear monitoring device 1, since signals are transmitted and received between the external device 34 such as a personal computer and the light emitting element 32 and the light receiving element 33 through the glass window 30, the cover 3 is detached from the terminal box 2. In addition, the detection signal from the canned motor, which is detected for monitoring the bearing, can be adjusted by remote control, and the workability for adjusting the detection signal can be improved.
[0023]
Furthermore, since the adjustment work can be performed while checking the information stored in the memory of the bearing wear monitoring device 1, quick and accurate adjustment work can be performed.
The present embodiment has been described above, but the present invention is not limited to this. For example, only one of the light emitting element 32 and the light receiving element 33 may be provided in the bearing wear monitoring device 1. . Further, instead of transmitting and receiving optical signals by the light emitting element 32 or the light receiving element 33, remote control by transmission and reception of radio waves and the like may be performed. Further, the present embodiment is applied to a canned motor, but may be applied to other motors such as a wet motor, an induction motor, a DC motor, and a synchronous motor.
[0024]
【The invention's effect】
As described above, according to the present invention, since the adjustment is performed by remote control from the outside of the protective cover through the see-through window, gain adjustment such as setting of the zero point of the detection signal can be performed without removing the protective cover, thereby improving workability. can do.
According to the second aspect of the present invention, since the canned motor is applied as the motor, the motor can be installed in the exposure area, and the gain can be adjusted at the time of gain adjustment such as setting a zero point of a detection signal when the motor is installed in the exposure area. Inconvenience can be prevented. That is, there is no need to move the motor to the non-exposure-proof area or to remove explosive gas around the motor when adjusting the gain, such as setting the zero point of the detection signal, and the working time for adjusting the detection signal can be reduced. In addition, there is no need to consider the timing of the adjustment work.
[0025]
According to the third aspect of the invention, since the adjustment of the detection signal is remotely controlled by the light receiving element that receives the optical signal, the adjustment operation can be performed more accurately than the one that is remotely controlled by radio waves. In other words, the protective cover is generally made of metal in terms of rigidity requirements, but when transmitting and receiving signals by radio waves, the metal protective cover may interfere with the radio waves to generate noise. According to the present invention, such a problem can be prevented.
According to the fourth aspect of the present invention, since the light signal is transmitted to the outside of the protective cover by the light emitting element, the adjusted set value of the detection signal can be transmitted to an external device such as a personal computer. As a result, it is possible to obtain information such as what setting values are obtained, and it is possible to accurately adjust the detection signal.
If both the light emitting element and the light receiving element are provided, the detection signal detected by the bearing wear monitoring means can be adjusted while confirming the detection signal and the set value, so that the detection signal can be adjusted quickly and accurately. be able to.
[Brief description of the drawings]
1 is a sectional view showing a motor bearing wear monitoring device according to the present invention; FIG. 2 is a top view showing a motor bearing wear monitoring device according to the present invention; FIG. 3 is a motor bearing wear monitoring device according to the present invention; FIG. 4 is a block diagram showing a motor bearing wear monitoring device according to the present invention; FIG. 5 is a schematic diagram showing a canned motor bearing wear monitoring configuration applied to the present invention; A perspective view showing a conventional canned motor bearing wear monitoring device [Description of reference numerals]
1 Bearing wear monitoring device 2, 102 Terminal box (protective cover)
2a, 102a Upper surface opening 2b Lower surface opening 2c Outer peripheral wall surfaces 3, 103 Lid (protective cover)
3a upper surface opening 3b lower surface opening 3c outer peripheral wall surface 3d end surface 4, 105 bolt 5, 104 terminal plate 6 screw 7 terminal 7a, 7b male screw 8, 110 wire insertion hole 9 grommet 10 terminal flange 11, 101 canned motor body 13, 14 Nut 15a Internal lead wire 16b External power supply wire 17 Signal wire 18 Crimp terminal 19 Lid locking pin 19a, 19b Male screw 20 Through hole 21 Screw hole 23 Display plate (display means)
24 printed board 25 transformer 26 connector 27 plate 28 signal line insertion hole 29 resin 30 glass window (transparent window)
31 LED
32 light emitting element (remote control means)
33 light receiving element (remote control means)
34 External device such as personal computer 35 IC (adjustment means)
36 Processing circuit (bearing wear monitoring means)
51 Stator 52a, 52b Detection coil 54 Rotor 54a Rotor groove

Claims (4)

Bearing wear monitoring means for monitoring the wear of the bearing by processing a detection signal from a motor having a bearing rotatably supporting the shaft;
Display means for displaying the wear state of the bearing monitored by the bearing wear monitoring means;
Together may adjust the detection signal detected by the bearing wear monitoring means, and adjusting means for transmitting the conditioned signal to said display means,
The bearing wear monitoring means, the display means, and the adjustment means are hermetically housed therein, and a protective cover is formed in which a see-through window is formed to make the display means visible,
In the motor bearing wear monitoring device equipped with
Wherein through the transparent window from the outside of the protective cover, bearing wear monitoring apparatus for a motor, characterized in that it comprises a remote control means to perform the zero point setting such gain adjustment of the detection signal by said adjustment means by remote control. The motor bearing wear monitoring device according to claim 1, wherein the motor is a canned motor having a bearing that rotatably supports a shaft connected to an impeller. 3. The motor bearing wear monitoring device according to claim 1, wherein the remote control unit includes a light receiving element that receives an optical signal emitted from outside the protection cover. 4. The motor bearing wear monitoring device according to claim 1, wherein the remote control unit includes a light emitting element that transmits an optical signal to the outside of the protection cover. 5.

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