CN204330201U - Based on the mechanical seal face friction torque measurement mechanism of self-powered and Wireless Data Transmission - Google Patents

Abstract

This technology provides a kind of moment of torsion that can realize mechanical seal to be measured in mechanical sealing performance tester accurately to measure, based on the mechanical seal face friction torque measurement mechanism of self-powered and Wireless Data Transmission, it comprises axle sleeve, trundle, force snesor, signal processor, wireless transmitter module, wireless receiving module, self-powered module; Main shaft is through axle sleeve, and the mechanical seal of end face friction torque to be measured is set on axle sleeve, and rotating ring is connected on axle sleeve, and stationary ring is fixed on annular seal space; The moment of torsion that the dynamic and static ring of described mechanical seal produces due to end-face friction, the moment of torsion passing to axle sleeve by trundle with main shaft balances each other; The product of the arm of force of the peripheral force that this moment of torsion is recorded by the force snesor pasted on trundle and force-detecting position determines, the peripheral force surveyed is by signal processor processes and transfer to wireless receiving module by wireless transmitter module; Utilize main shaft or axle sleeve to rotate the electric energy produced to be powered to signal processor and wireless transmitter module by self-powered module.

Description

Based on the mechanical seal face friction torque measurement mechanism of self-powered and Wireless Data Transmission

Technical field

This technology belongs to technical field of measurement and test, particularly relates to a kind of test unit carrying out mechanical seal face friction torque measurement.

Background technology

The continuous deterioration of the day by day in short supply and environment of resource, proposes the production requirement of zero leakage and zero-emission to enterprise.Mechanical seal, as the main shaft seal of equipment dynamic in commercial production, on the one hand for the leakproof of equipment provides safeguard, on the other hand, due to end face frictional wear, also consumes shaft power.For this reason, the continuous effort of people, seeks suitable face pressure and material, to reduce end-face friction power consumption, in the reenlist life-span, ensures again the sealing of mechanical seal simultaneously.But whether suitable quality and the face pressure of sealing pair match materials be, embodies a concentrated reflection of in the size of end face friction torque.

In current known technology, the end face friction torque measuring method of mechanical sealing performance tester has anti-Zhi Lifa and TRANSFER METHOD.The end face friction torque measuring technique being developed out by these two kinds of methods has 4 kinds:

Dynamometer link is installed in rotary seal chamber and is connected to torque sensor.As Mayer (mechanical seal. Beijing: chemical industry publishing house, 1981) and the mounting torque sensor measurement seal face friction torque technology on rotary seal chamber that proposes such as patent CN103630301.Annular seal space supporting need be got up by this technology, and the rotationally supported friction of annular seal space exists very important impact to measuring accuracy.

Mounting torque speed probe between motor and line shaft.As Silvaggio(Silvaggo J A, Lipski M J, and Van Bramer K G. Successful Field Operation through Seal Development and Testing. Lubrication Engineering, 1987,43 (6): 433-439) and document (high parameter mechanical seal test stand data collection and control system. petroleum machinery, the 32nd volume the 1st phase in 2004) etc. propose adopt between motor and bearing seat mounting torque speed probe carry out measurement mechanical seal face friction torque.During test, the moment of torsion of this commercial measurement is the total torque on test unit main shaft, comprises the tested friction torque of seal face, the frictional resistance moment of main bearing and the mechanical seal rotary part stirring moment of torsion in sealing medium.Because the frictional resistance moment and the stirring moment of torsion of mechanical seal rotary part in the sealing medium of different pressures that carry the main bearing of axially different power also cannot directly be measured, the stirring moment of torsion that the frictional resistance moment of the main bearing under usual zero load and sealing medium are under normal pressure replaces, and these all bring very large impact to the measuring accuracy of end face friction torque; In addition, due to more than 5-7 times that total torque when mechanical seal test device starts is normal moment of torsion, thus the torque speed sensor being equipped with larger stress axis diameter is needed, and the end face friction torque of mechanical seal test device under normally running is less, if with this torque speed sensor measurement mechanical seal face friction torque, the axial strain then produced is less, and measuring accuracy will be lower.In order to improve measuring accuracy, the stress axis diameter of selected torque sensor just should be less, but the less stress axis of diameter easily produces again plastic yield even ruptures, so measuring accuracy and stress axis size are can't eat one's cake and have it.

Mounting torque sensor between stationary seat and stationary ring.Sun Jianjun (discussion of mechanical seal controllability Study and engineer applied problem thereof. mechanical engineering journal, 2005, the method of mounting torque sensor measurement seal face friction torque between stationary seat and stationary ring 41(2): 15-19) etc. proposed, exactly small-range major diameter tubular torque sensor is connected between stationary seat and stationary ring, the friction torque being rotarily driven the generation of stationary ring deflection by rotating ring is balanced by the resistive torque of torque sensor, records mechanical seal face friction torque.The advantage of this method is that sensor construction is simple, easy for installation, particularly eliminate the frictional resistance moment of O shape circle between stationary ring and stationary seat to the impact of measuring, but manufacturing and designing of small-range major diameter tubular torque sensor has difficulties, and fails to obtain effective breakthrough always.For the mechanical seal of band corrugated tube stationary ring, end face friction torque can adopt the method in patent ZL 200610039084.5 " multi-parameter controllable high-rotating speed mechanical sealing performance tester " to measure, and the measuring system described in the method is made up of stationary seat, guide cylinder, the fan-shaped gear piece of angular displacement transmission, angular displacement sensor and pinion wheel; Guide cylinder one end and stationary ring filler ring inner hole thread compact siro spinning technology, the other end kink of guide cylinder is in stationary seat gland endoporus and reach annular seal space outside by axle sleeve.Stretched out the skew of the guide cylinder of annular seal space outside by angular displacement sensor measurement, measurement mechanical can be sealed in the change of flexible member windup-degree before and after work, then calculate end face friction torque according to elastic element rigidity.This measuring method can make the angular displacement of stationary ring pass to guide cylinder without loss, to fan-shaped gear piece, to pinion wheel, then to angular displacement sensor, avoids the interference of additional torque to measured value.But the driving error be present between fan-shaped gear piece and pinion wheel drastically influence measuring accuracy.

The mechanical seal face friction torque measurement method that patent CN102183327B relates to, namely places coin type torque sensor on stationary ring breach.Use the null principle of moment balance of total torque suffered by stationary ring when normally running, sensor is surveyed the addition of each moment of resistance and be end face friction torque.For in the mechanical seal measuring system be made up of rotating ring, stationary ring, stationary ring sealing O type circle, load sensor support, load sensor, end face bearing, end face bearing seat and annular seal space end cap, 2 load sensor rotational symmetry are arranged on the load sensor support of annular seal space end cap endoporus side, and force-detecting position tangentially becomes rotational symmetry to be arranged in the side of 2 anti-rotation pin-and-holes of stationary ring.In work, due to the effect of the end face friction torque Mm between dynamic and static ring, stationary ring has the trend of following rotating ring and rotating, the moment of resistance M1s that this trend is produced by the load sensor that the frictional resistance moment Mf of the suffered annular seal space end cap endoporus of stationary ring sealing O shape circle and anti-rotation pin-and-hole side place install balance, i.e. Mm=Mf+M1s.The wherein frictional resistance moment Mf that encloses of stationary seat endoporus and O shape, the load sensor that can be arranged on 2 anti-rotation pin-and-hole sides of stationary ring at annular seal space makes a reservation in advance; The distance (arm of force) that the tangential force equivalent of the stationary ring periphery that the moment of resistance Ms that the load sensor that under duty, anti-rotation pin-and-hole side place installs produces is recorded by sensor is multiplied by between 2 load sensor force-detecting positions obtains.The method shortcoming is obvious equally, because will measure the frictional resistance moment of the suffered annular seal space end cap endoporus of O shape circle, and O shape circle is because of its material reason, and between individuality, friction factor is also not quite similar, and causes end face friction torque to measure precision not good enough.

Between axle sleeve and axle, torque sensor is set.As patent CN103267613A proposes U-shaped mouth that to offer at axle sleeve two ends about axle sleeve central cross-section symmetry, the main shaft corresponding to U-shaped mouth place is arranging trundle; Process two sections of screw threads that pitch is equal, rotation direction is contrary in the middle part of axle sleeve, screw two nuts thereon, its dorsal part installs the rotating seat in two mechanical seal to be measured respectively; Rotating seat slides axially with axle sleeve, circumference location be connected; Trundle is arranged peripheral force sensor and be used for indirect inspection end face friction torque.Need point out it is that this patent does not mention that embodiment arranged by detailed torque sensor, i.e. long-time powerup issue during concrete effectively transmission and the wireless signal transmission of wireless signal at high speeds.

Summary of the invention

The object of this technology is to provide a kind of moment of torsion that can realize mechanical seal to be measured in mechanical sealing performance tester and accurately measures, can self-powered and the mechanical seal face friction torque measurement mechanism carrying out Wireless Data Transmission in the course of work.

The mechanical seal face friction torque measurement mechanism based on self-powered and Wireless Data Transmission described in this technology, comprises the axle sleeve same bus in two ends offering U-shaped mouth, trundle, force snesor, signal processor, wireless transmitter module, wireless receiving module, the self-powered module be connected to through U-shaped mouth on main shaft; Main shaft is through axle sleeve, and the mechanical seal of end face friction torque to be measured is set on axle sleeve, and rotating ring is connected on axle sleeve, and stationary ring is fixed on annular seal space; It is characterized in that: the moment of torsion that the dynamic and static ring of described mechanical seal produces due to end-face friction, the moment of torsion passing to axle sleeve by trundle with main shaft balances each other; The product of the arm of force of the peripheral force that this moment of torsion is recorded by the force snesor pasted on trundle and force-detecting position determines, the peripheral force surveyed is by signal processor processes and transfer to wireless receiving module by wireless transmitter module; Utilize main shaft or axle sleeve to rotate the electric energy produced to be powered to signal processor and wireless transmitter module by self-powered module.

The above-mentioned mechanical seal face friction torque measurement mechanism based on self-powered and Wireless Data Transmission, it is characterized in that, described self-powered module comprises the magnet being fixed on annular seal space outside, the coil winding of following main shaft rotation, rectification circuit and mu balanced circuit, is treated as galvanic current source after the coil winding cutting magnetic line generation induction electromotive force of rotation through overcommutation circuit, mu balanced circuit.

The above-mentioned mechanical seal face friction torque measurement mechanism based on self-powered and Wireless Data Transmission, it is characterized in that, described sleeve end adopts enclosed construction to be wrapped by main shaft end, its sleeve end connects one and settles box, be built-in with signal processor, wireless transmitter module, rectification circuit and mu balanced circuit, the output terminal of coil winding is connected with rectification circuit, mu balanced circuit.

The above-mentioned mechanical seal face friction torque measurement mechanism based on self-powered and Wireless Data Transmission, it is characterized in that, described self-powered module comprises piezoelectric chip, pressure block and the mu balanced circuit of following main shaft and rotating; When piezoelectric chip is subject to the extruding of the pressure block rotated with main shaft in radial direction, distance between the positive and negative charge of its inside can reduce, therefore the free charge be originally attached on piezoelectric chip surface will some be released, and is treated as galvanic current source through mu balanced circuit.Otherwise when piezoelectric chip restores to the original state, the distance between the positive and negative charge of its inside becomes large, has occurred again larger polarization intensity; Now, piezoelectric chip surface again can absorbed portion electric charge again, and this is also released the condition of providing continuously for free charge.

The above-mentioned mechanical seal face friction torque measurement mechanism based on self-powered and Wireless Data Transmission, it is characterized in that, described sleeve end adopts enclosed construction to be wrapped by main shaft end, its sleeve end connects one and settles box, is built-in with signal processor, wireless transmitter module, mu balanced circuit and piezoelectric chip and pressure block; The periphery of piezoelectric chip sticks on the inner hole wall of arrangement box, and pressure block sticks on the madial wall of piezoelectric chip.

The above-mentioned mechanical seal face friction torque measurement mechanism based on self-powered and Wireless Data Transmission, is characterized in that, circumferentially evenly places the ball of 3 or more between the two ends of described axle sleeve and main shaft on the xsect of axle respectively.Friction can be reduced like this, thus dynamic and static ring friction torque is almost passed to the force snesor pasted on trundle without loss.

The advantage that this technology has and good effect:

Achieve the accurate measurement of mechanical seal face friction torque.End face friction torque passes to axle sleeve by main shaft, a few free of losses of trundle.The power measured by piezoelectric sensor is multiplied by the end face friction torque that the corresponding arm of force (force snesor is to the distance of spindle centerline) obtains, and precision is improved.

Axle sleeve is offered U-shaped mouth, fixed conveyor pin on the main shaft corresponding with U-shaped mouth, place force snesor at trundle sidewall and U-shaped mouth side-walls.Peripheral force when normally being run by measurement mechanical seal test device suffered by trundle sidewall is multiplied by the corresponding arm of force and draws end face friction torque.Compare the end face friction torque drawn at stationary ring stop pin opening part placement coin type torque sensor, avoid the frictional resistance moment between stationary ring sealing O shape circle and annular seal space end cap endoporus, improve the precision of actual measurement.

Described axle sleeve adopts semi-enclosed structure to be wrapped by main shaft end, and the arrangement box of its end is directly connected with axle sleeve, integral with axle sleeve.Rotate with axle sleeve in the arrangement box that signal processor (comprising signal amplification module, Signal-regulated kinase, single-chip microcomputer etc. with A/D translation function), wireless transmitter module, rectification circuit, mu balanced circuit all place main shaft end.The axle sleeve with mechanical seal is only needed to be set on main shaft during installation, trundle is fixed by the screw screwing in main shaft screw at the U-shaped mouth place of axle sleeve, only need shed trundle during dismounting axle sleeve can be unloaded from main shaft together with arrangement box, convenient and swift.

This test unit has installed ball additional at main shaft and shaft room, makes main shaft and shaft room become sliding friction by original static friction, improves the precision that end face friction torque is measured.

Adopt the mode of Wireless Data Transmission that the signal of collection is sent to axle external signal receiving end, avoid the winding problem of transmission signal line when measuring dynamic torque signal.

The ingenious main shaft by mechanical seal test High Rotation Speed of self-powered module, utilizes main shaft High Rotation Speed to drive coil winding around the magnet rotors being fixed on annular seal space, and the coil winding cutting magnetic line of rotation produces induction electromotive force and as power supply; Or drive piezoelectric chip and pressure block by main shaft High Rotation Speed, under the centrifugal action of pressure block, the positive and negative charge redistribution of the surfaces externally and internally of piezoelectric chip, forms positive and negative charged surface and becomes power supply.Mechanical sealing performance testing machine main shaft is once running; self-powered module just starts generating; as long as mechanical sealing performance testing machine does not shut down; self-powered module continued power; solve self-powered module to signal processor and wireless transmitter module long period power requirement, avoid dry cell or lithium battery power supply system and occur needing in process of the test to shut down the generation that battery phenomenon is changed in stripping assembly.

Accompanying drawing explanation

Fig. 1 is a kind of schematic diagram of the mechanical seal face friction torque measurement mechanism based on self-powered and Wireless Data Transmission;

Fig. 2 is the enlarged drawing of main shaft, axle sleeve, magnet, coil winding, arrangement box etc. in Fig. 1;

Fig. 3 is that A in Fig. 1 is to partial view;

Fig. 4 is the schematic diagram of the another kind of mechanical seal face friction torque measurement mechanism based on self-powered and Wireless Data Transmission;

Fig. 5 is the enlarged drawing of main shaft, axle sleeve, piezoelectric chip, pressure block, arrangement box etc. in Fig. 4;

Fig. 6 is the B-B cut-open view of Fig. 5;

Fig. 7 is wireless sending module NRF24L01 workflow schematic diagram;

Fig. 8 is the block diagram of signal transacting and transmitter module;

Fig. 9 is the block diagram of Signal reception and processing module.

In figure, main shaft 1, axle sleeve 2, front end U-shaped mouth 21, rear end U-shaped mouth 23, ball 3, annular seal space 4, end cap 41, side leakage chamber end cap 5, settles box 6, stationary ring O shape circle 71, stationary ring 72, rotating ring 73, rotating ring O shape circle 74, filler ring 75, spring 76, rotating seat 77, nut 78, short pin 79, trundle 8, force snesor 9, magnet 101, coil winding 102, rectification circuit 103, mu balanced circuit 104, pressure block 108, piezoelectric chip 109.

Embodiment

Below in conjunction with schematic diagram and embodiment, this technology is described further:

Shown in Fig. 1-6, main shaft 1 periphery is formed by ball 3 and axle sleeve 2 and is rotationally connected.The right-hand member of axle sleeve 2 is closed, and main shaft stretches in axle sleeve.Main shaft and axle sleeve have the annular seal space 4 of end cap 41 jointly through two ends, annular seal space right-hand member is fixed with side leakage chamber end cap 5.The arrangement box 6 being positioned at side leakage chamber end cap is fixed with outside the right-hand member blind end of axle sleeve.

Tested mechanical seal comprises stationary ring O shape circle 71, stationary ring 72, rotating ring 73, rotating ring O shape circle 74, filler ring 75, spring 76, rotating seat 77, nut 78, short pin 79 etc. respectively.Rotating ring 73 and rotating seat 77 slide axially to locate in circumference and are connected, and be disposed with spring 76, filler ring 75, rotating ring O shape enclose 74 between rotating seat 77 and rotating ring 73; Rotating ring 73 is by sealing between rotating ring O shape circle 74 and axle sleeve.Filler ring 75 slides axially with rotating seat 77 and is connected.Stationary ring 72 to be sealed with the center pit on end cap by the stationary ring O shape circle 71 be arranged on stationary ring 72 periphery and is connected; Stationary ring 72 and rotating ring 73 are axially relative.Two sections of screw threads that pitch is equal, rotation direction is contrary are had in the middle part of axle sleeve 2; Two nuts 78 respectively with described threaded engagement; Stretch in the short pin-and-hole opened on two nuts with the short pin 79 of axle sleeve axis being parallel simultaneously; The dorsal part of two nuts is two rotating seats 77 respectively; Rotating seat 77 and axle sleeve slide axially to locate in circumference and are connected.

The two ends that axle sleeve stretches out end cap offer the U-shaped mouth 21,23 of center line on same bus, and the main shaft 1 corresponding to U-shaped mouth 23 place has been connected by screw trundle 8.

The trundle sidewall corresponding with U-shaped mouth sidewall is adhesive with force snesor 9, for detecting the size of peripheral force between U-shaped mouth sidewall and trundle.Force snesor 9 adopts FLEXIFORCE A310 piezoelectric film sensor, and this piezoelectric film sensor compares other piezoelectric film sensors linear, drift better, magnetic hysteresis, temperature sensitivity, and cost performance is higher.The detection data of force snesor 9 transfer to signal condition amplifying circuit.

Signal transacting and transmitter module are by signal condition amplifying circuit, form with 3.3V low-voltage and low-power dissipation single-chip microcomputer STC12LE5608AD, the wireless transmitter module NRF24L01, self-powered module etc. of A/D translation function.Wireless transmitter module is made up of signal condition amplifying circuit, low-power consumption RF device, antenna etc.Self-powered module is the power supplies such as signal condition amplifying circuit, single-chip microcomputer, wireless transmitter module.FLEXIFORCE A310 physical quantity that piezoelectric film sensor is surveyed converts analog signals to by signal condition amplifying circuit, changes into digital signal by Chip Microcomputer A/D change-over circuit, transmits finally by wireless transmitter module.Single-chip microcomputer STC12LE5608AD is identical with wireless sending module NRF24L01 supply voltage.The running that self-powered module is tested along with mechanical sealing performance and start generating, powers to each functional unit of transmission of wireless signals end.

Output voltage signal after conditioning amplifying circuit is amplified through signal by the inner stressed generation charge variation of piezoelectric film sensor FLEXIFORCE A310, the A/D convertor circuit carried through STC12LE5608AD single-chip microcomputer converts digital signal to by analog signals, then carries out wireless data transmission by wireless transport module NRF24L01.

NRF24L01 is the monolithic wireless transceiver chip being operated in the ISM frequency range of 2.4GHz ~ 2.5GHz of being produced by NORDIC.Have the following advantages: the setting of output power channel selection and agreement can directly be arranged by SPI interface; Almost can be connected to various singlechip chip, and complete Wireless data transmission work; Extremely low current drain.

Be illustrated in figure 7 the workflow of wireless transport module NRF24L01: be initially located in sleep and treat awakening mode, this pattern has extremely low current drain, saves Power supply amount greatly; After data enter, wireless transport module NRF24L01 transfers normal mode of operation to by sleep pattern, transmits 8 significant characters and check bit; Again be attributed to sleep pattern when check bit end of transmission, wait for that next group data enters.

Signal reception and processing module are arranged on annular seal space outside, and it comprises wireless receiving module NRF24L01, low-power scm, host computer, Labview data processing and display unit etc.Receive by wireless receiving module the signal that wireless sending module sends, after conditioning, deliver to single-chip microcomputer, finally by single-chip microcomputer through Serial Port Transmission to host computer, then deliver to Labview data processing and display unit and carry out data processing, in real time display, print and preserve.Be the power supply such as wireless receiving module, low-power scm at data receiver by 5V power supply.

Labview process and display unit adopt Development of Modular integration mode, input submodule, the real-time display sub-module of data, data processing (curve) submodule, real time data preserve and form with report generation submodule, remote monitoring submodule by serial ports; Data enter Labview processes and displays unit through serial ports load module, show after data processing module carries out friction torque curve-fitting data through the real-time display module of data in host computer interface; The data simultaneously processed are stored in upper computer end with the form of form.

Circumferentially on main shaft, have annular groove between the two ends of main shaft and axle sleeve, evenly place more than 3 or 3 balls 3 respectively.The friction torque of main shaft and shaft room is rolling friction moment of torsion, reduce friction, almost can ignore relative to end face friction torque, thus dynamic and static ring friction torque is almost passed to main shaft by axle sleeve without loss, what produce due to end-face friction according to mechanical seal dynamic and static ring turns round the principle that moment and principal Axes balanced each other by the moment of torsion that trundle passes to axle sleeve, and the peripheral force measured by the piezoelectric sensor pasted on trundle is multiplied can draws end face friction torque with the arm of force of force-detecting position.

Self-powered module has two kinds, and a kind of is the self-powered module of the principle design producing electromotive force based on coil cutting magnetic line, see Fig. 1-3; There will be a self-powered module for the principle design of opposed polarity electric charge, see Fig. 3-5 in its surface under stress based on direct piezo electric effect and piezoelectric chip.

See Fig. 1-3, the self-powered module producing the principle design of electromotive force based on coil cutting magnetic line comprise be fixed on the magnet 101 leaked hunting on the end cap of chamber, follow coil winding 102 that main shaft rotates, rectification circuit 103 and mu balanced circuit 104, the main part of coil winding 102 extend in magnet 101, and the output terminal of coil winding is connected with rectification circuit, mu balanced circuit.The coil winding cutting magnetic line rotated delivers to rectification circuit and mu balanced circuit process after producing induction electromotive force.Signal condition amplifying circuit, 3.3V low-voltage and low-power dissipation single-chip microcomputer STC12LE5608AD, wireless transmitter module NRF24L01 with A/D translation function, rectification circuit, mu balanced circuit are all placed on and settle in box.Settle box to be connected with axle sleeve, rotate with axle sleeve, spindle synchronous.Only need that the trundle at U-shaped mouth place is fixed on main shaft (or shedding from main shaft) by screw when (or dismounting) is installed and axle sleeve can be mounted to (or removing from axle) on axle together with holder.According to electromagnetic induction principle, coil winding is fixed on to settle in box and follows main shaft high-speed rotation and constantly cut and be fixed on the magnet leaked hunting on the end cap of chamber and the magnetic field magnetic variations of flux produced, and produces induction electromotive force; The induction electromotive force produced, stable supply voltage is obtained after rectification and voltage stabilizing process, avoid because of use general dry battery or the limited experimental period that causes of lithium battery power supply electric capacity too short, need frequent termination to test stripping assembly replacing battery, the situation obtaining end face friction torque valid data cannot be continued.

See Fig. 3-5, comprise based on the piezoelectric chip self-powered module that its surface there will be the principle design of opposed polarity electric charge under pressure two piezoelectric chips 109, two pressure blocks 108, mu balanced circuits 104 of being arranged at and settling box 6 inwall; Signal condition amplifying circuit, be all placed on settle in box with 3.3V low-voltage and low-power dissipation single-chip microcomputer STC12LE5608AD, the wireless transmitter module NRF24L01 of A/D translation function, rectification circuit.Settle box to be connected with axle sleeve, rotate with axle sleeve, spindle synchronous.Along with the rotation of main shaft, piezoelectric chip is subject to the extruding of the centrifugal force produced from pressure block in the radial direction at main shaft, form the two poles of the earth with positive and negative charge in interior outside.After two piezoelectric chip series connection, the two poles of the earth of two piezoelectric chip positive and negative charges are connected to mu balanced circuit.The output of mu balanced circuit respectively with signal condition amplifying circuit, be connected with 3.3V low-voltage and low-power dissipation single-chip microcomputer STC12LE5608AD, the wireless transmitter module NRF24L01 of A/D translation function, to its power supply.In main shaft and axle sleeve operation process, when the centrifugal force that pressure block produces reduces (diminishing or vibration that dynamic and static ring friction etc. causes of motor speed), piezoelectric chip is caused to restore to the original state, distance between the positive and negative charge of now its inside becomes large, there is larger polarization intensity, make piezoelectric chip surface absorbed portion electric charge again, this is also released the condition of providing continuously for free charge.

On the basis not changing function, carrying out corresponding equivalence to each ingredient of this technical patent to replace, is also the protection domain of technique.

Claims (6)

1., based on the mechanical seal face friction torque measurement mechanism of self-powered and Wireless Data Transmission, comprise the axle sleeve same bus in two ends offering U-shaped mouth, trundle, force snesor, signal processor, wireless transmitter module, wireless receiving module, the self-powered module be connected to through U-shaped mouth on main shaft; Main shaft is through axle sleeve, and the mechanical seal of end face friction torque to be measured is set on axle sleeve, and rotating ring is connected on axle sleeve, and stationary ring is fixed on annular seal space; It is characterized in that: the moment of torsion that the dynamic and static ring of described mechanical seal produces due to end-face friction, the moment of torsion passing to axle sleeve by trundle with main shaft balances each other; The product of the arm of force of the peripheral force that this moment of torsion is recorded by the force snesor pasted on trundle and force-detecting position determines, the peripheral force surveyed is by signal processor processes and transfer to wireless receiving module through wireless transmitter module; Utilize main shaft or axle sleeve to rotate the electric energy produced to be powered to signal processor and wireless transmitter module by self-powered module.

2. as claimed in claim 1 based on the mechanical seal face friction torque measurement mechanism of self-powered and Wireless Data Transmission, it is characterized in that, described self-powered module comprises the magnet being fixed on annular seal space outside, the coil winding of following main shaft rotation, rectification circuit and mu balanced circuit, is treated as galvanic current source after the coil winding cutting magnetic line generation induction electromotive force of rotation through overcommutation circuit and mu balanced circuit.

3. as claimed in claim 2 based on the mechanical seal face friction torque measurement mechanism of self-powered and Wireless Data Transmission, it is characterized in that, described sleeve end adopts enclosed construction to be wrapped by main shaft end, its sleeve end connects one and settles box, be built-in with signal processor, wireless transmitter module, rectification circuit and mu balanced circuit, the output terminal of coil winding is connected with rectification circuit, mu balanced circuit.

4., as claimed in claim 1 based on the mechanical seal face friction torque measurement mechanism of self-powered and Wireless Data Transmission, it is characterized in that, described self-powered module comprises piezoelectric chip, pressure block and the mu balanced circuit of following main shaft and rotating; When piezoelectric chip is subject to the extruding of the pressure block rotated with main shaft in radial direction, distance between the positive and negative charge of its inside can reduce, therefore the free charge be originally attached on plane of crystal will some be released, and is treated as galvanic current source through mu balanced circuit.

5. as claimed in claim 4 based on the mechanical seal face friction torque measurement mechanism of self-powered and Wireless Data Transmission, it is characterized in that, described sleeve end adopts enclosed construction to be wrapped by main shaft end, its sleeve end connects one and settles box, is built-in with signal processor, wireless transmitter module, mu balanced circuit, piezoelectric chip and pressure block; The periphery of piezoelectric chip sticks on the inner hole wall of arrangement box, and pressure block sticks on the madial wall of piezoelectric chip.

6. as claimed in claim 1 based on the mechanical seal face friction torque measurement mechanism of self-powered and Wireless Data Transmission, it is characterized in that, on the xsect of axle, between the two ends of described axle sleeve and main shaft, circumferentially evenly place the ball of 3 or more respectively.