CN103712547A - Bearing monitor - Google Patents

Bearing monitor Download PDF

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Publication number
CN103712547A
CN103712547A CN201410008890.0A CN201410008890A CN103712547A CN 103712547 A CN103712547 A CN 103712547A CN 201410008890 A CN201410008890 A CN 201410008890A CN 103712547 A CN103712547 A CN 103712547A
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circuit
lvdt
sensing coil
signal
displacement
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CN201410008890.0A
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CN103712547B (en
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王允学
邹立莉
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Abstract

The invention discloses a bearing monitor. The bearing monitor comprises a shell, a displacement sensing part, a displacement circuit displaying part and an end cover. The shell is fixedly connected to a body of a canned motor pump to be monitored through a canned motor pump sealing flange type shell cover. The canned motor pump sealing flange type shell cover and a sealing distance sleeve are welded into an integrated combined flange type distance sleeve structure, wherein the sealing distance sleeve is provided with a semi-closed cavity structure. The displacement sensing part comprises a measuring rod, an iron core, an LVDT sensing coil and an LVDT sensing coil framework; one end of the measuring rod is connected with a canned motor pump drive shaft through a connector; the iron core is arranged at the other end of the measuring rod; the LVDT sensing coil framework is fixedly arranged on the outer wall of the sealing distance sleeve in a sleeved mode, and the LVDT sensing coil is arranged on the LVDT sensing coil framework; the displacement circuit displaying part comprises a displacement circuit displaying main shell and a displaying circuit. The bearing monitor can detect corresponding displacement of a pump shaft in time, display displacement data on site, and effectively prolong the service life of the canned motor pump due to the adoption of an isolating and sealing structure.

Description

Bearing monitoring instrument
Technical field
The present invention relates to a kind of monitoring device, relate to specifically a kind of bearing monitoring instrument that is applicable to monitor the axial displacement of the no-leakage pump series products such as canned motor pump.
Background technology
Along with the enhancing of whole society's environmental consciousness, canned motor pump etc. are all widely applied in numerous industries without revealing pump.The character of canned motor pump has determined to use the necessity of sliding bearing, and a gordian technique is wherein exactly to accomplish the axial force balance of canned motor pump drive disk assembly, but canned motor pump in use, its sliding bearing is along with the lengthening of service time, and wearing and tearing gradually, once wear extent reaches capacity, axial force is out of trim immediately, cause canned motor pump to damage rapidly, for chemical enterprise, can cause very large economic loss.In view of canned motor pump belongs to the characteristic of static pressure container, and existing axial detecting instrument can only adopt the metering system of contact, this just causes existing axial detecting instrument can not directly apply to the axial force measuration of canned motor pump drive disk assembly, and then cannot realize the detection of canned motor pump drive disk assembly axial displacement, extend the serviceable life of canned motor pump.
Summary of the invention
Defect in view of prior art existence, the object of the invention is to provide a kind of for monitoring the monitor of canned motor pump axial displacement, when this monitor can change in the axial force of canned motor pump, detect in time the corresponding displacement of pump shaft, the on-the-spot displacement data that shows.
To achieve these goals, technical scheme of the present invention:
Bearing monitoring instrument, comprise housing, be arranged at enclosure interior displacement sensing part, be arranged at shift circuit display section and end cap on housing, it is characterized in that:
Described housing is fixedly connected on canned motor pump body to be monitored by canned motor pump seal flange formula casing cover, the seal isolation cover that described canned motor pump seal flange formula casing cover and has the semi-enclosed cavity structure formula structure that is welded as a whole, forms flange form spacer sleeve structure;
Described displacement sensing partly comprises sounding rod, iron core, LVDT sensing coil, LVDT sensing coil skeleton, wherein, described sounding rod one end is connected with canned motor pump transmission shaft by connector, other end end arranges iron core, described LVDT sensing coil skeleton fixed cover is at described seal isolation cover outer wall, and on described LVDT sensing coil skeleton, LVDT sensing coil is set, forms LVDT sensing arrangement;
Described shift circuit display section comprises that shift circuit shows main casing and display circuit, wherein, described shift circuit shows that main casing comprises upper shell, upper end cover, sight glass and glass pressure ring, described upper shell is fixedly connected on described housing, and form the shell structure with cavity of shift circuit display section with upper end cover, and on described upper end cover, have for holding the groove of sight glass, described display circuit comprises sensing coil testing circuit, main control circuit, LED display circuit, LVDT voltage conversion circuit, connection terminal circuit, described sensing coil testing circuit is delivered to LVDT voltage conversion circuit after converting the iron core mechanical displacement signal detecting to inductance signal, described LVDT voltage conversion circuit converts inductance signal to voltage signal and delivers to main control circuit, described main control circuit carries out exporting after calculation process the digital signal of two-way displacement signal, one railway digital signal is delivered to LED display circuit, for the corresponding displacement monitoring signal data of on-the-spot demonstration, one railway digital signal is delivered to connection terminal circuit after main control circuit converts simulating signal to, for user DCS, control, above-mentioned each circuit is realized and being connected by interconnector connector.
Described main control circuit comprises Voltage stabilizing module and serial data sending module in central processing unit, A/D modular converter, D/A modular converter, sheet, wherein, described A/D modular converter converts analog quantity to digital signal after receiving the voltage signal of described LVDT voltage conversion circuit output, delivers to central processing unit and carries out calculation process; Described central processing unit output two ways of digital signals, a railway digital signal is delivered to LED display circuit by serial data sending module, for scene, shows corresponding detecting position shifting signal data; Another railway digital signal is delivered to connection terminal circuit after converting digital signal to simulating signal by D/A modular converter, for user DCS, controls.
Described main control circuit also comprises switching input module, and described switching input module connects hall sensing key-press module, for for the on-the-spot input control data of user, monitor is carried out to adjusting operation.
Described main control circuit also comprises switch power module, and described switch power module is when providing excitation power supply for described LVDT sensing arrangement; Be connected with Voltage stabilizing module in the sheet of described main control circuit, for main control circuit provides stabilized voltage supply.
On described housing, be also provided with a Golan joint design, described Golan joint design comprises the Golan seat being connected to one with described housing and is arranged on Zuo Shang Golan, described Golan head, adopts Golan sealing gasket sealing between the head of Zuo Yu Golan, described Golan.
Insulated enclosure between described LVDT sensing coil and LVDT sensing coil skeleton is realized by infusion epoxy resin casting glue.
Between described housing and described end cap, end cap seal circle is set; End cap seal circle is set between described upper shell, upper end cover.
Measuring principle of the present invention:
The transmission shaft of canned motor pump links together sounding rod by connector, when shield electric machine drives transmission shaft work, transmission shaft, connector, sounding rod is rotated together, and then makes sounding rod follow transmission shafts to move left and right; Singularity in view of canned motor pump job specification, it is in fact a kind of pressure restraining element, inside has pressure, in order to guarantee that not affecting canned motor pump work realizes real-time monitoring drive shaft displacement simultaneously, design adopts the seal isolation cover that canned motor pump seal flange formula casing cover and is had to the semi-enclosed cavity structure formula structure that is welded as a whole, form flange form spacer sleeve structure, canned motor pump seal flange formula casing cover is fixed on canned motor pump body, guaranteed sealing without leakage; By semibridge system telefault and skeleton, be enclosed within the outer wall of spacer sleeve structure, and sounding rod other end end arranges iron core, described iron core and sounding rod one end are arranged in spacer sleeve, have formed isolating seal formula non-contact type shaft position sensor simultaneously; When sounding rod carries out axially-movable, between the iron core of its end and coil, can form the inductance being directly proportional to iron core displacement, by corresponding detection display circuit, can realize the real-time monitoring of axial displacement.
Compared with prior art, beneficial effect of the present invention: the present invention is for monitoring a kind of special device of canned motor pump axial displacement, when the axial force of canned motor pump changes, can detect in time the corresponding displacement of pump shaft, the on-the-spot displacement data that shows, export corresponding current signal, for reporting to the police and controlling simultaneously; Simultaneously it adopts isolating seal structure, can effectively extend canned motor pump serviceable life, monitors in time axial displacement, and transfinite and report to the police immediately, the termination of pumping of seriously transfiniting, anti-skidding bearing damage, avoids accident to occur; Save and periodically tear pump maintenance open, saving of labor, laborsaving, improve the economic benefit of enterprise; And adjustment and installation simple and fast, is applicable to inflammable, explosive operating mode and uses.
Accompanying drawing explanation
Fig. 1 is bearing monitoring instrument embodiment of the present invention 1 cross-sectional view;
Fig. 2 is control circuit schematic diagram of the present invention;
Fig. 3 is bearing monitoring instrument embodiment of the present invention 2 structural representations.
In figure: 1, housing, 2, upper shell, 3, upper end cover, 4, end cap, 5, Golan seat, 6, sight glass, 7, glass pressure ring, 8, end cap seal cushion rubber, 9, end cap seal cushion rubber, 10, a Golan sealing gasket, 11, Golan head, 12, LVDT sensing coil, 13, LVDT sensing coil skeleton, 14, epoxy resin embedding adhesive, 15, button and demonstration film pcb board, 16, LED shows pcb board, 17, main control pcb board, 18, interconnector connector, 19, sensing coil pcb board, 20, LVDT voltage transitions pcb board, 21, connection terminal pcb board, 22, connection terminal, 23, canned motor pump seal flange formula casing cover, 24, seal isolation cover, 25, sounding rod, 26, connector, 27, canned motor pump transmission shaft, 28, canned motor pump sliding bearing, 29, canned motor pump body, 30, iron core, 31, displacement display instrument.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, further illustrate technical scheme of the present invention:
Displacement measurement principle of the present invention is used for reference and is adopted LVDT sensor design principle, and LVDT is a kind of pickoff, and its input quantity is the mechanical shift in telefault center iron core, and its output quantity is and the proportional alternating voltage of iron core displacement.Semibridge system LVDT only has a coil, and there is individual tap at center, resembles autotransformer and works, and driving voltage provides by coil, and centre tapped voltage and iron core displacement are proportional.
Concrete, this bearing monitoring instrument is comprised of physical construction part and two major parts of detection control circuit.
Its physical construction part embodiment 1 as shown in Figure 1, the isolating seal formula non-contact type shaft position sensor structure, the shift circuit that mainly comprise housing 1, sounding rod 25, are arranged at housing 1 inside show main casing, Golan connector structure and end cap 4.
Concrete described housing 1 is fixed on canned motor pump body 29 to be monitored by canned motor pump seal flange formula casing cover 23, the seal isolation cover 24 that described canned motor pump seal flange formula casing cover 23 and has the semi-enclosed cavity structure formula structure that is welded as a whole, forms flange form spacer sleeve structure, one end of described sounding rod 25 is connected with canned motor pump transmission shaft 27 by connector 26, the other end is sheathed on flange form spacer sleeve inside configuration, described sounding rod 25 front end tip position places arrange iron core 30, described LVDT sensing coil skeleton 13 is admittedly placed on described seal isolation and overlaps 24 outer walls, on described LVDT sensing coil skeleton 13, LVDT sensing coil 12 is set, and the insulated enclosure that uses infusion epoxy resin casting glue 14 to realize between described LVDT sensing coil and LVDT sensing coil skeleton, form described isolating seal formula non-contact type shaft position sensor structure, refer to Fig. 1, described shift circuit shows that the upper shell 2 of main casing is fixed on described housing 1, and form the shell structure with cavity of shift circuit display sections with upper end cover 3, and on described upper end cover 3, have for holding the groove of sight glass 6, sight glass 6 is compressed by glass pressure ring 7, in order to adapt to inflammable, explosive operating mode user demand, a Golan hermetically-sealed construction is set to be connected with a Golan sealing end pothead with explosion-proof electric apparatus, be on described housing 1, to be also provided with a Golan joint design, described Golan joint design comprises the Golan seat being fixed with one with described housing 1 and is arranged on Zuo Shang Golan, described Golan head, between the head of Zuo Yu Golan, described Golan, adopt Golan sealing gasket sealing, and between described housing 1 and described end cap 4, end cap seal circle 9 is set, described upper shell 2, upper end cover 3 arrange end cap seal circle 8.
This bearing monitoring instrument detects control circuit by some pcb boards being set at physical construction partial interior, at pcb board, lay the monitoring demonstration that related circuit is realized axial displacement, it arranges layout can as shown in Figure 1, also can carry out layout according to actual user demand.
Case study on implementation as described in Figure 1 comprises button and shows that film pcb board 15, LED show pcb board 16, main control pcb board 17, sensing coil pcb board 19, LVDT voltage transitions pcb board 20 and connection terminal pcb board 21, on button and demonstration film pcb board 15, is laid with hall sensing key-press module circuit; At LED, show that pcb board 16 is laid with for showing the LED display circuit of the LED display circuit of displacement monitoring data; On main control pcb board 17, be laid with the main control circuit for analytical calculation; At described sensing coil pcb board 19, be laid with the observation circuit for detection of drive shaft displacement signal, at described LVDT voltage transitions pcb board 20, be laid with for differential inductance signal being become to the LVDT voltage conversion circuit of voltage signal, at described connection terminal pcb board, be laid with corresponding connection terminal circuit.
Described display circuit comprises sensing coil testing circuit, main control circuit, LED display circuit, LVDT voltage conversion circuit, connection terminal circuit, described sensing coil testing circuit is delivered to LVDT voltage conversion circuit by the iron core mechanical displacement signal monitoring, described LVDT voltage conversion circuit converts inductance signal to voltage signal and delivers to main control circuit, main control circuit carries out exporting after calculation process the digital signal of two-way corresponding positions shifting signal, one railway digital signal is delivered to LED display circuit, for the corresponding displacement monitoring signal data of on-the-spot demonstration, one railway digital signal is delivered to connection terminal circuit after main control circuit converts simulating signal to, for user DCS, control, above-mentioned each circuit is realized and being electrically connected to by interconnector connector 18.
Described main control circuit comprises Voltage stabilizing module, switching input module and serial data sending module in central processing unit, A/D modular converter, D/A modular converter, sheet, wherein, described A/D modular converter converts analog quantity to digital signal after receiving the voltage signal of described differential amplifier output, delivers to central processing unit and carries out calculation process; Described central processing unit output two ways of digital signals, a railway digital signal is delivered to LED display circuit by serial data sending module, for scene, shows corresponding displacement monitoring signal data; Another railway digital signal is converted to digital signal after simulating signal and delivers to after LVDT voltage conversion circuit converts corresponding current signal to and deliver to connection terminal circuit by D/A modular converter, for user DCS, controls.
Described display circuit also comprises a switch power module, and described switch power module is when providing excitation power supply for described LVDT sensing arrangement; Be connected with Voltage stabilizing module in the sheet of described main control circuit, for main control circuit provides stabilized voltage supply.
Its display circuit part mainly comprises sensing coil testing circuit, main control circuit, LED display circuit, LVDT voltage conversion circuit, connection terminal circuit.
Specific embodiment circuit as shown in Figure 2, sensing coil testing circuit in this example and LVDT voltage conversion circuit adopt the disposal system based on AD698 chip, AD698 is a kind of perfect, single chip integrated differential transformer type signal processing subsystem, with in conjunction with LVDT, use, can sensor mechanical location be converted to unipolarity or bipolarity DC voltage with degree of precision and repeatability, the low-distortion sine wave driving voltage that it produces is added to 1 of coil, 3 ends, at 2 of coil, between 3, obtain one and the proportional ac voltage VL of corresponding inductance value, and this ac voltage just with sensor in the proportional relation of displacement of iron core, VL is through demodulation and the filtering of AD698 inside, export a direct current non-linear voltage VD, after differential direct current amplifier suppressed zero VD-VZ=VA, the voltage signal VA of differential amplifier output is delivered to (being the single-chip microcomputer shown in Fig. 2) analog voltage input pin of main control circuit, the A/D modular converter of main control circuit converts analog quantity to digital signal, central processing unit carries out these data calculation process and exports two ways of digital signals, wherein, first via digital signal is delivered to LED display circuit by serial data sending module, after MAX7219 carries out code conversion, directly drive charactron to carry out field digital demonstration and the demonstration of light beam analog position, two paths of digital signals is delivered to the D/A modular converter of main control circuit, convert digital signal to analog voltage signal, export V/I modular converter (this example adopts AD694) to, convert voltage signal to 4~20mA current signal, deliver to connection terminal, for user DCS.
Described display circuit also comprises a switch power module, and described switch power module is when providing excitation power supply for described differential transformer type signal processing subsystem; Be connected with Voltage stabilizing module in the sheet of described main control circuit, for main control circuit provides stabilized voltage supply.
Described hall sensing key-press module at least arranges three data entry keys (SET, increase ▲, reduce ▼ as Fig. 3), for on-the-spot handling safety is all used magnetic pen, on pen, magnetic field senses on Hall switching element AH543 through implosion guard, the switching value signal of AH543 is delivered to the I/O interface of single-chip microcomputer, MCU is according to the state of interface, process the data of input, during for instrument actual motion.
Topology layout of the present invention and contour structures also can as embodiment 2(as shown in Figure 3), its principle is consistent with embodiment 1.
The above; it is only preferably embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; according to technical scheme of the present invention and inventive concept thereof, be equal to replacement or changed, within all should being encompassed in protection scope of the present invention.

Claims (7)

1. bearing monitoring instrument, comprises housing (1), end cap (4), is arranged at the displacement sensing part of enclosure interior and is arranged at the shift circuit display section on housing, it is characterized in that:
Described housing (1) is fixedly connected on canned motor pump body to be monitored (29) by canned motor pump seal flange formula casing cover (23), the seal isolation cover (24) that described canned motor pump seal flange formula casing cover (23) and has the semi-enclosed cavity structure formula structure that is welded as a whole, forms flange form spacer sleeve structure;
Described displacement sensing partly comprises sounding rod (25), iron core (30), LVDT sensing coil (12), LVDT sensing coil skeleton (13), wherein, described sounding rod (25) one end is connected with canned motor pump transmission shaft (27) by connector (26), other end end arranges iron core (30), described LVDT sensing coil skeleton (13) fixed cover is located at described seal isolation cover (24) outer wall, and LVDT sensing coil (12) is set on described LVDT sensing coil skeleton (13), forms LVDT sensing arrangement;
Described shift circuit display section comprises that shift circuit shows main casing and display circuit, wherein, described shift circuit shows that main casing comprises upper shell (2), upper end cover (3), sight glass (6) and glass pressure ring (7), described upper shell (2) is fixedly connected on described housing (1), and form the shell structure with cavity of shift circuit display section with upper end cover (3), and on described upper end cover (3), have for holding the groove of sight glass (6), described display circuit comprises sensing coil testing circuit, main control circuit, LED display circuit, LVDT voltage conversion circuit, connection terminal circuit, described sensing coil testing circuit is delivered to LVDT voltage conversion circuit after converting the iron core mechanical displacement signal detecting to inductance signal, described LVDT voltage conversion circuit converts inductance signal to voltage signal and delivers to main control circuit, described main control circuit carries out exporting after calculation process the digital signal of two-way displacement signal, one railway digital signal is delivered to LED display circuit, for the corresponding detecting position shifting signal data of on-the-spot demonstration, one railway digital signal is delivered to connection terminal circuit after main control circuit converts simulating signal to, for user DCS, control, above-mentioned each circuit is realized and being connected by interconnector connector (18).
2. bearing monitoring instrument according to claim 1, it is characterized in that: described main control circuit comprises Voltage stabilizing module and serial data sending module in central processing unit, A/D modular converter, D/A modular converter, sheet, wherein, described A/D modular converter converts analog quantity to digital signal after receiving the voltage signal of described LVDT voltage conversion circuit output, delivers to central processing unit and carries out calculation process; Described central processing unit output two ways of digital signals, a railway digital signal is delivered to LED display circuit by serial data sending module, for scene, shows corresponding detecting position shifting signal data; Another railway digital signal is delivered to connection terminal circuit after converting digital signal to simulating signal by D/A modular converter, for user DCS, controls.
3. bearing monitoring instrument according to claim 2, it is characterized in that: described main control circuit also comprises switching input module, described switching input module connects hall sensing key-press module, for for the on-the-spot input control data of user, monitor is carried out to adjusting operation.
4. bearing monitoring instrument according to claim 2, is characterized in that: described main control circuit also comprises switch power module, and described switch power module is when providing excitation power supply for described LVDT sensing arrangement; Be connected with Voltage stabilizing module in the sheet of described main control circuit, for main control circuit provides stabilized voltage supply.
5. bearing monitoring instrument according to claim 1, it is characterized in that: on described housing (1), be also provided with a Golan joint design, described Golan joint design comprises the Golan seat (6) being connected to one with described housing (1) and is arranged on described Golan seat that (the Golan head (11) on 6 adopts Golan sealing gasket (10) sealing between described Golan seat (6) and Golan head (11).
6. bearing monitoring instrument according to claim 1, is characterized in that: the insulated enclosure between described LVDT sensing coil (12) and LVDT sensing coil skeleton (13) is realized by infusion epoxy resin casting glue (14).
7. bearing monitoring instrument according to claim 1, is characterized in that: between described housing (1) and described end cap (4), end cap seal circle (9) is set; Between described upper shell (2), upper end cover (3), end cap seal circle (8) is set.
CN201410008890.0A 2014-01-07 2014-01-07 Bearing monitoring instrument Active CN103712547B (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104090512A (en) * 2014-07-04 2014-10-08 大连帝国屏蔽电泵有限公司 Shield electric pump all-item intelligent monitoring instrument
CN104500413A (en) * 2014-11-21 2015-04-08 江苏大学 Measuring unit for measuring axial force of submerged pump
CN111980939A (en) * 2020-08-31 2020-11-24 合肥工业大学 Non-contact type measuring device and method for measuring axial play amount of main shaft of shield pump
CN112461544A (en) * 2020-11-17 2021-03-09 王允学 Axial position detector
CN116576765A (en) * 2023-07-11 2023-08-11 武汉市海益高端装备结构设计有限公司 Wear monitoring device for ship stern shaft water lubrication bearing
CN117532140A (en) * 2024-01-09 2024-02-09 广东隆信激光智能装备有限公司 Device and process for detecting laser cutting error of superfine tube
WO2024046191A1 (en) * 2022-08-30 2024-03-07 东方电气集团东方电机有限公司 Shielding motor rotor axial displacement monitoring apparatus

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CN1825066A (en) * 2006-03-28 2006-08-30 王允学 Isolative linear displacement transmitter
CN202350728U (en) * 2011-10-21 2012-07-25 无锡市厚德自动化仪表有限公司 Monitor for axial displacement

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JPH11351185A (en) * 1998-06-09 1999-12-21 Ebara Corp Canned motor pump
CN1825066A (en) * 2006-03-28 2006-08-30 王允学 Isolative linear displacement transmitter
CN202350728U (en) * 2011-10-21 2012-07-25 无锡市厚德自动化仪表有限公司 Monitor for axial displacement

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104090512A (en) * 2014-07-04 2014-10-08 大连帝国屏蔽电泵有限公司 Shield electric pump all-item intelligent monitoring instrument
CN104090512B (en) * 2014-07-04 2016-08-31 大连帝国屏蔽电泵有限公司 Shielded electric pump full item intelligent controller
CN104500413A (en) * 2014-11-21 2015-04-08 江苏大学 Measuring unit for measuring axial force of submerged pump
CN104500413B (en) * 2014-11-21 2017-01-11 江苏大学 Measuring unit for measuring axial force of submerged pump
CN111980939A (en) * 2020-08-31 2020-11-24 合肥工业大学 Non-contact type measuring device and method for measuring axial play amount of main shaft of shield pump
CN112461544A (en) * 2020-11-17 2021-03-09 王允学 Axial position detector
WO2024046191A1 (en) * 2022-08-30 2024-03-07 东方电气集团东方电机有限公司 Shielding motor rotor axial displacement monitoring apparatus
CN116576765A (en) * 2023-07-11 2023-08-11 武汉市海益高端装备结构设计有限公司 Wear monitoring device for ship stern shaft water lubrication bearing
CN117532140A (en) * 2024-01-09 2024-02-09 广东隆信激光智能装备有限公司 Device and process for detecting laser cutting error of superfine tube

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