CN106353024A - Mechanical seal face friction torque measuring device based on piezoelectric effect and wireless data transmission - Google Patents
Mechanical seal face friction torque measuring device based on piezoelectric effect and wireless data transmission Download PDFInfo
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- CN106353024A CN106353024A CN201610877966.2A CN201610877966A CN106353024A CN 106353024 A CN106353024 A CN 106353024A CN 201610877966 A CN201610877966 A CN 201610877966A CN 106353024 A CN106353024 A CN 106353024A
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- China
- Prior art keywords
- mechanical seal
- main shaft
- face friction
- friction torque
- axle sleeve
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0042—Force sensors associated with force applying means applying a torque
Abstract
The invention provides a mechanical seal face friction torque measuring device based on a piezoelectric effect and wireless data transmission, and aims to realize accurate measurement of a torque of a mechanical seal to be measured in a mechanical seal performance testing device. The mechanical seal face friction torque measuring device based on the piezoelectric effect and wireless data transmission comprises a shaft sleeve, a driving pin, a force sensor, a signal processor, a wireless transmitting module, a wireless receiving module and a self-powered module, wherein a main shaft passes through the shaft sleeve; a mechanical seal of which the face friction torque is to be measured passes through the shaft sleeve; a moving ring is connected to the shaft sleeve; a static ring is fixed to a sealing cavity; torques generated by face friction of the moving ring and the static ring of the mechanical seal are balanced with a torque transmitted to the shaft sleeve by the main shaft through the driving pin; the torque is decided by a product of circumferential force measured by the force sensor adhering to the driving pin and a moment arm of a force measuring point; the measured circumferential force is processed by the signal processor, and is transmitted to the wireless receiving module through the wireless transmitting module; electric energy generated by the rotation of the main shaft or the shaft sleeve is used for supplying power to the signal processor and the wireless transmitting module through the self-powered module.
Description
Technical field
The application be the applying date be on January 15th, 2015, Application No. 2015100208076, invention entitled based on from
The divisional application of the original application of mechanical seal face friction torque measurement apparatus of power supply and wireless data transmission.
This technology belongs to technical field of measurement and test, more particularly to a kind of examination carrying out mechanical seal face friction torque measurement
Experiment device.
Background technology
The continuous deterioration of the increasingly 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 provides safeguard for the leakproof of equipment, on the other hand,
Due to end face frictional wear, also consume shaft power.For this reason, people are continually striving to, seek suitable face pressure and material, with
Reduce end-face friction power consumption, extend service life, ensure the sealing of mechanical seal simultaneously again.However, sealing pair match materials
Quality and face pressure whether suitable, concentrated reflection in the size of end face friction torque.
In currently known technology the end face friction torque measuring method of mechanical sealing performance tester have anti-Zhi Lifa and
TRANSFER METHOD.The end face friction torque e measurement technology that be developed by both approaches has 4 kinds:
Dynamometer link is installed on rotary seal chamber and is connected to torque sensor.As mayer (mechanical seal. Beijing: chemical industry publish
Society, 1981) and the proposition such as patent cn103630301 torque sensor measurement seal face friction is installed on rotary seal chamber
Moment of torsion technology.Annular seal space supporting need to be got up by this technology, and the friction that annular seal space rotationally supports exists and can not neglect to measuring accuracy
Depending on impact.
Torque speed sensor is installed 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
Testing stand data collection and control system. petroleum machinery, the 1st phase of volume 32 in 2004) etc. propose using in motor and bearing block
Between torque speed sensor is installed measuring mechanical seal face friction torque.During test, the moment of torsion of this commercial measurement is
Total torque on assay device main shaft, close including the friction torque of tested seal face, the frictional resistance moment of base bearing and machinery
Envelope stirring moment of torsion in sealing medium for the rotary part.Frictional resistance moment and machinery due to the base bearing of the axially different power of carrying
Sealing stirring moment of torsion in the sealing medium of different pressures for the rotary part also cannot direct measurement, the generally main shaft under use zero load
The stirring moment of torsion that the frictional resistance moment held and sealing medium are under normal pressure replacing, these measurements all to end face friction torque
Precision brings very big impact；Further, since when mechanical seal test device starts total torque be 5-7 times of normal moment of torsion with
On, so that being equipped with the torque speed sensor of larger stress shaft diameter, and the mechanical seal test device under normally running
End face friction torque less, if with this torque speed sensor measure mechanical seal face friction torque, the axle producing
Strain is less, and certainty of measurement will be relatively low.In order to improve certainty of measurement, the stress shaft diameter of selected torque sensor just should be relatively
Little, but the less stress axiss of diameter easily produce plastic deformation again and even rupture, so certainty of measurement and stress axiss size
Can not get both.
Torque sensor is installed between stationary seat and stationary ring.(mechanical seal controllability Study and its engineering should for Sun Jianjun
Discussion with problem. mechanical engineering journal, 2005,41(2): 15-19) proposition such as moment of torsion is installed between stationary seat and stationary ring
Sensor measures the method for seal face friction torque it is simply that small-range major diameter tubular torque sensor is connected on stationary seat
And stationary ring between, friction torque produced by stationary ring deflection is rotarily driven by rotating ring and is put down by the resistive torque of torque sensor
Weighing apparatus, to record mechanical seal face friction torque.The advantage of this method is that sensor construction is simple, easy for installation, particularly
The frictional resistance moment eliminating o shape circle between stationary ring and stationary seat is to the impact measuring, but small-range major diameter tubular moment of torsion passes
Manufacturing and designing of sensor has difficulties, and fails always to obtain effective breakthrough.For the mechanical seal with corrugated tube stationary ring, end face
Friction torque can adopt patent zl 200610039084.5 " multi-parameter controllable high-rotating speed mechanical sealing performance tester "
In method measurement, the measuring system described in the method passes by stationary seat, guide cylinder, the fan-shaped gear piece of angular displacement transmission, angular displacement
Sensor and little gear composition；Guide cylinder one end is closely connected with stationary ring filler ring inner hole thread, and the other end kink of guide cylinder is quiet
Reach outside annular seal space in ring seat gland endoporus and by axle sleeve.Stretched out outside annular seal space by angular displacement sensor measurement
The skew of guide cylinder, can measure the change that machinery is sealed in flexible member windup-degree before and after work, further according to flexible member
Rigidimeter calculates end face friction torque.This measuring method can make the angular displacement of stationary ring pass to guide cylinder without loss, extremely
Fan-shaped gear piece, to little gear, then to angular displacement sensor, it is to avoid the interference to measured value for the additional torque.But it is present in sector
Driving error between gear piece and little gear drastically influence certainty of measurement.
The mechanical seal face friction torque measurement method that patent cn102183327b is related to, places on stationary ring breach
Coin type torque sensor.With the null principle of moment balance of total torque suffered by stationary ring during normal operation, by sensor institute
Survey each moment of resistance and be added as end face friction torque.Support for by rotating ring, stationary ring, stationary ring sealing o type circle, load sensor
In frame, load sensor, the mechanical seal measuring system of end face bearing, end face bearing block and annular seal space end cap composition, 2 loadings
Sensor axis are symmetrically mounted on the load sensor support of annular seal space end cap endoporus side, and force-detecting position tangentially becomes axial symmetry
It is arranged in the side of 2 anti-rotation pin-and-holes of stationary ring.In work, due to the effect of end face friction torque mm between dynamic and static ring, quiet
Ring has the trend rotating with phantom ring, and this trend is sealed the friction of annular seal space end cap endoporus suffered by o shape circle by stationary ring
Moment of resistance m1s that the load sensor installed at moment of resistance mf and anti-rotation pin-and-hole side produces is balanced, i.e. mm=mf+m1s.
Frictional resistance moment mf of wherein stationary seat endoporus and o shape circle, can be arranged on 2 anti-rotation pin-and-hole sides of stationary ring in annular seal space
Load sensor makes a reservation in advance；Moment of resistance ms that the load sensor installed at anti-rotation pin-and-hole side under working condition produces is by passing
The tangential force equivalent of the stationary ring periphery that sensor records is multiplied by the distance between 2 load sensor force-detecting positions (arm of force) and obtains.This
Method shortcoming is equally obvious, because the frictional resistance moment of annular seal space end cap endoporus suffered by o shape circle will be measured, and o shape circle is because of its material
Matter reason, between individuality, coefficient of friction is also not quite similar, and causes end face friction torque measurement precision not good enough.
Torque sensor is set between axle sleeve and axle.As patent cn103267613a propose axle sleeve two ends open up with regard to
The symmetrical u shape mouth of axle sleeve central cross-section, the main shaft at corresponding to u shape mouth arranges trundle；Two sections of spiral shells are processed in the middle part of axle sleeve
Away from equal, oppositely oriented screw thread, screw two nuts thereon, its dorsal part is respectively mounted dynamic in two mechanical seals to be measured
Ring seat；Rotating seat is slid axially with axle sleeve, is connected circumferentially positioned；Circumferential force transducer is arranged on trundle and is used for indirect survey
Amount end face friction torque.Should be pointed out that is, this patent does not refer to detailed torque sensor arrangement embodiment, that is, in height
Under fast state, wireless signal specifically effectively transmits and long-time powerup issue during wireless signal transmission.
Content of the invention
The purpose of this technology is to provide a kind of torsion being capable of mechanical seal to be measured in mechanical sealing performance tester
Square accurate measurement, being capable of self-powered and the mechanical seal face friction torque measurement carrying out wireless data transmission in work process
Device.
The mechanical seal face friction torque measurement apparatus based on self-powered and wireless data transmission described in this technology, bag
Include the axle sleeve that u shape mouth is offered on the same bus in two ends, the trundle being connected on main shaft through u shape mouth, force transducer, signal
Processor, wireless transmitter module, wireless receiving module, self-powered module；Main shaft passes through axle sleeve, the machine of end face friction torque to be measured
Tool sealing 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: described machinery is close
The moment of torsion that the dynamic and static ring of envelope is produced due to end-face friction, is balanced each other by the moment of torsion that trundle passes to axle sleeve with main shaft；This
The peripheral force that moment of torsion is recorded by the force transducer pasted on trundle and the product of the arm of force of force-detecting position determine, the circumference surveyed
Power is transmitted to wireless receiving module by signal processor processes and by wireless transmitter module；Produced using main shaft or axle sleeve rotation
Electric energy is powered to signal processor and wireless transmitter module by self-powered module.
The above-mentioned mechanical seal face friction torque measurement apparatus based on self-powered and wireless data transmission, its feature
It is that described self-powered module includes being fixed on Magnet outside annular seal space, the coil windings following main shaft rotation, rectification circuit
And mu balanced circuit, process through over commutation circuit, mu balanced circuit after the coil windings cutting magnetic line generation induction electromotive force of rotation
Become galvanic current source.Here it is the mechanical seal face friction torque based on induction electromotive force and wireless data transmission is surveyed
Amount device.
The above-mentioned mechanical seal face friction torque measurement apparatus based on self-powered and wireless data transmission, its feature
It is that main shaft end is wrapped by described sleeve end using enclosed construction, its sleeve end connects an arrangement box, is built-in with
Signal processor, wireless transmitter module, rectification circuit and mu balanced circuit, the outfan of coil windings and rectification circuit, voltage stabilizing electricity
Road is connected.
The above-mentioned mechanical seal face friction torque measurement apparatus based on self-powered and wireless data transmission, its feature
It is that described self-powered module includes piezoelectric chip, pressure block and the mu balanced circuit following main shaft rotation；When piezoelectric chip is in footpath
To when being subject to extrude with the pressure block that main shaft rotates, inside can produce polarization phenomena, makes charged ion that relative displacement to occur, thus
The contrary electric charge of symbol equal in magnitude is produced on plane of crystal and forms two poles, be treated as through mu balanced circuit stable straight
Stream power supply.Here it is the mechanical seal face friction torque measurement apparatus based on piezoelectric effect and wireless data transmission.
The above-mentioned mechanical seal face friction torque measurement apparatus based on self-powered and wireless data transmission, its feature
It is that main shaft end is wrapped by described sleeve end using enclosed construction, its sleeve end connects an arrangement 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 in arrangement
On the inner hole wall of box, pressure block sticks on the medial wall of piezoelectric chip.
The above-mentioned mechanical seal face friction torque measurement apparatus based on self-powered and wireless data transmission, its feature
It is that the ball of 3 or more is circumferentially uniformly placed respectively between the described two ends of axle sleeve and main shaft on the cross section of axle.
Friction so can be reduced, thus dynamic and static ring friction torque is almost passed to without loss the power pasting on trundle passing
Sensor.
This technology has the advantage that and good effect:
Achieve the accurate measurement of mechanical seal face friction torque.End face friction torque passes through main shaft, a few free of losses of trundle
Pass to axle sleeve.It is multiplied by the corresponding arm of force (distance of force transducer to spindle centerline) by the power that piezoelectric transducer is measured to obtain
The end face friction torque arriving, precision is improved.
U shape mouth is opened up on axle sleeve, fixed conveyor pin on the main shaft corresponding with u shape mouth, in trundle side wall and u shape mouth side
Force transducer is placed at wall.When normally being run by measuring mechanical seal test device, the peripheral force suffered by the wall of trundle side is multiplied by
The corresponding arm of force draws end face friction torque.Compare and place the end face that coin type torque sensor draws at stationary ring stop pin opening
Friction torque, avoids the frictional resistance moment that stationary ring seals between o shape circle and annular seal space end cap endoporus, improves the essence of actual measurement
Accuracy.
Main shaft end is wrapped by described axle sleeve using semi-enclosed structure, the arrangement box of its end directly with axle sleeve phase
Even, integral with axle sleeve.Signal processor (includes signal amplification module, Signal-regulated kinase, the list with a/d translation function
Piece machine etc.), wireless transmitter module, rectification circuit, mu balanced circuit all place in the arrangement box of main shaft end and rotate with axle sleeve.Install
When only need the axle sleeve with mechanical seal is set on main shaft, at the u-shaped mouth of axle sleeve by trundle pass through screw in main shaft
The screw of screw is fixed, and only need to shed trundle during dismounting can be convenient by axle sleeve together with disposing box to unload from main shaft
Fast.
This assay device has installed ball additional so that main shaft and shaft room are become by original static friction in main shaft and shaft room
Sliding friction, improves the precision of end face friction torque measurement.
By the way of wireless data transmission, the signal of collection is sent to axle external signal receiving terminal, it is to avoid measurement is dynamic
The winding problem of transmission signal line during torque signal.
The ingenious main shaft testing high-speed rotation by mechanical seal of self-powered module, using main shaft high-speed rotation band moving winding
Around the magnet rotors being fixed on annular seal space, the coil windings cutting magnetic line of rotation produces induction electromotive force to winding and conduct is electric
Source；Or piezoelectric chip and pressure block, under the centrifugal action of pressure block, piezoelectric chip are driven by main shaft high-speed rotation
The positive and negative charge redistribution of surfaces externally and internally, forms positive and negative charged surface and becomes power supply.Mechanical sealing performance testing machine main shaft
Once operating, self-powered module just starts to generate electricity, 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 reguirements, it is to avoid dry electricity
Pond or lithium battery power supply system occur needing in process of the test to shut down the generation that battery phenomenon is changed in provision for disengagement.
Brief description
Fig. 1 is a kind of mechanical seal face friction torque measurement apparatus based on induction electromotive force and wireless data transmission
Schematic diagram；
Fig. 2 is main shaft in Fig. 1, axle sleeve, Magnet, coil windings, disposes the enlarged drawing of box etc.；
Fig. 3 is a in Fig. 1 to partial view；
Fig. 4 is a kind of signal of the mechanical seal face friction torque measurement apparatus based on piezoelectric effect and wireless data transmission
Figure；
Fig. 5 is main shaft in Fig. 4, axle sleeve, piezoelectric chip, pressure block, disposes the enlarged drawing of box etc.；
Fig. 6 is the b-b sectional view of Fig. 5；
Fig. 7 is wireless sending module nrf24l01 workflow schematic diagram；
Fig. 8 is the block diagram of signal processing 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 shape mouth 21, rear end u shape mouth 23, ball 3, annular seal space 4, end cap 41, side leakage chamber
End cap 5, disposes 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, spiral shell
Female 78, short pin 79, trundle 8, force transducer 9, Magnet 101, coil windings 102, rectification circuit 103, mu balanced circuit 104, pressure
Power block 108, piezoelectric chip 109.
Specific embodiment
With reference to schematic diagram and specific embodiment, this technology is described further:
Referring to shown in Fig. 1-6, main shaft 1 periphery is passed through ball 3 and is connected with axle sleeve 2 formation rotation.The right-hand member closing of axle sleeve 2, main shaft
Stretch in axle sleeve.Main shaft and axle sleeve have the annular seal space 4 of end cap 41 jointly through two ends, and annular seal space right-hand member is fixed with side leakage chamber end
Lid 5.It is fixed with the arrangement box 6 in the end cap of side leakage chamber outside the right-hand member blind end of axle sleeve.
Tested mechanical seal includes stationary ring o shape circle 71, stationary ring 72, rotating ring 73, rotating ring o shape circle 74, filler ring 75, spring respectively
76th, rotating seat 77, nut 78, short pin 79 etc..Rotating ring 73 is slid axially with rotating seat 77 and is connected circumferentially positioned, in rotating seat
It is disposed with spring 76, filler ring 75, rotating ring o shape circle 74 between 77 and rotating ring 73；Rotating ring 73 passes through rotating ring o shape circle 74 and axle sleeve
Between seal.Filler ring 75 is slid axially with rotating seat 77 and is connected.Stationary ring 72 is by the stationary ring o shape being arranged on stationary ring 72 periphery
Circle 71 is connected with the centre bore sealing on end cap；Stationary ring 72 and rotating ring 73 are axially opposing.Two sections of pitch phases are had in the middle part of axle sleeve 2
On, oppositely oriented screw thread；Two nuts 78 are coordinated with described screw thread respectively；Stretch into the short pin 79 of axle sleeve diameter parallel simultaneously
In the short pin-and-hole opened on two nuts；The dorsal part of two nuts is two rotating seats 77 respectively；Rotating seat 77 and axle sleeve exist
Slide axially and be connected circumferentially positioned.
The two ends that axle sleeve stretches out end cap open up u shape mouth 21,23 on same bus for the own centre line, corresponding to u shape mouth
It has been connected by screw trundle 8 on main shaft 1 at 23.
Pasting force sensor 9 with the wall of u shape mouth side wall corresponding trundle side, for detecting u shape mouth side wall and biography
The size of peripheral force between dynamic pin.Force transducer 9 adopts flexiforce a310 piezoelectric film sensor, and this piezoelectric membrane passes
Sensor compares other piezoelectric film sensors more preferably linear, drift, magnetic hysteresis, temperature sensitivity, and cost performance is higher.
The detection data of force transducer 9 is transmitted to signal condition amplifying circuit.
Signal processing and transmitter module are by signal condition amplifying circuit, the 3.3v low-voltage and low-power dissipation with a/d translation function
Single-chip microcomputer stc12le5608ad, wireless transmitter module nrf24l01, self-powered module etc. form.Wireless transmitter module is by signal
The compositions such as conditioning amplifying circuit, low-power consumption radio-frequency (RF) device, antenna.Self-powered module is signal condition amplifying circuit, single-chip microcomputer, wireless
Transmitter module etc. is powered.The surveyed physical quantity of flexiforce a310 piezoelectric film sensor is changed by signal condition amplifying circuit
Become analog signalses, digital signal is changed into by single-chip microcomputer ad change-over circuit, after through wireless transmitter module transmission.Single-chip microcomputer
Stc12le5608ad is identical with wireless sending module nrf24l01 supply voltage.Self-powered module is tried with mechanical sealing performance
The operating tested and start generating, each functional unit at transmission of wireless signals end is powered.
Produce change in electrical charge by the internal stress of piezoelectric film sensor flexiforce a310 to put through signal amplification conditioning
Output voltage signal after big circuit, is converted into by analog signalses through the ad change-over circuit that stc12le5608ad single-chip microcomputer carries
Digital signal, then wireless data transmission is carried out by wireless transport module nrf24l01.
Nrf24l01 is the monolithic wireless transceiver of the ism frequency range being operated in 2.4ghz ~ 2.5ghz being produced by nordic
Chip.Have the advantage that output channel selection and the setting of agreement can be directly configured by spi interface；Almost
May be coupled to various singlechip chips, and complete Wireless data transmission work；Extremely low current drain.
It is illustrated in figure 7 the workflow of wireless transport module nrf24l01: it is initially located in sleep and treat awakening mode, this mould
Formula has extremely low current drain, is greatly saved power supply delivery；After data enters, wireless transport module nrf24l01
Normal mode of operation, 8 significant characters of transmission and check bit are switched to by sleep pattern；Again it is attributed to when check bit end of transmission
Sleep pattern, waits next group data to enter.
Signal receives and processing module is arranged on outside annular seal space, and it includes wireless receiving module nrf24l01, low-power consumption
Single-chip microcomputer, host computer, labview data processing and display unit etc..Receive wireless sending module by wireless receiving module to send
Signal, conditioned after deliver to single-chip microcomputer, finally by single-chip microcomputer through Serial Port Transmission to host computer, then deliver at labview data
Reason and display unit carry out data processing, display in real time, print preservation.Data receiver by 5v power supply be wireless receiving mould
Block, low-power scm etc. are powered.
Labview is processed and display unit adopts Development of Modular integration mode, real-time by serial ports input submodule, data
Display sub-module, data processing (curve matching) submodule, real time data preserve and report generation submodule, remote monitoring submodule
Block forms；Data enters labview through serial ports input module and processes display unit, and data processing module carries out friction torque data
Show in host computer interface through the real-time display module of data after curve matching；The data simultaneously processing is preserved in the form of form
In upper computer end.
Annular groove is circumferentially had between the two ends of main shaft and axle sleeve on main shaft, uniformly places 3 or more than 3 respectively and roll
Pearl 3.Main shaft is rolling friction moment of torsion with the friction torque of shaft room, reduces friction, with respect to end face friction torque almost
Negligible, thus dynamic and static ring friction torque is almost passed to main shaft by axle sleeve without loss, according to mechanical seal
Moment of torsion that dynamic and static ring is produced due to end-face friction and the principle that main shaft is balanced each other by the moment of torsion that trundle passes to axle sleeve, will
Paste the peripheral force that the piezoelectric transducer on trundle measures and be multiplied with the arm of force of force-detecting position and can draw end face friction torque.
Self-powered module has two kinds, a kind of be the principle design producing electromotive force based on coil cutting magnetic line confession
Electric module, referring to Fig. 1-3；One kind be based on direct piezoelectric effect be piezoelectric chip under stress its surface occur opposed polarity electricity
The self-powered module of the principle design of lotus, referring to Fig. 3-5.
Referring to Fig. 1-3, and the self-powered module being produced the principle design of electromotive force based on coil cutting magnetic line is included admittedly
It is scheduled on the Magnet 101 leaking hunting on the end cap of chamber, the coil windings 102 following main shaft rotation, rectification circuit 103 and mu balanced circuit 104,
The main part of coil windings 102 extend in Magnet 101, and the outfan of coil windings is connected with rectification circuit, mu balanced circuit.
The coil windings cutting magnetic line of rotation delivers to rectification circuit after producing induction electromotive force and mu balanced circuit is processed.Signal condition is put
Big circuit, the 3.3v low-voltage and low-power dissipation single-chip microcomputer stc12le5608ad with a/d translation function, wireless transmitter module
Nrf24l01, rectification circuit, mu balanced circuit are both placed in disposing in box.Dispose box to be connected with axle sleeve, synchronously revolve with axle sleeve, main shaft
Turn.Only need for the trundle at u-shaped mouth, by screw, main shaft (or shedding) to be fixed on from main shaft when (or dismounting) is installed
Axle sleeve is attached on axle (or removing from axle) together with container.According to electromagnetic induction principle, coil windings are fixed on
Follow main shaft high-speed rotation in arrangement box and constantly cut the magnetic field flux quantitative change be fixed on the Magnet leaking hunting on the end cap of chamber and produce
Change, produce induction electromotive force；The induction electromotive force producing, rectified and voltage stabilizing obtains stable supply voltage after processing, it is to avoid
Because causing experimental period too short using general dry battery or lithium battery power supply capacitance are limited, need to frequently stop experiment dismounting dress
Put and change battery it is impossible to persistently obtain the situation of end face friction torque valid data.
Referring to Fig. 3-5, based on piezoelectric chip, its surface occurs the principle design of opposed polarity electric charge under pressure
Self-powered module include being arranged at two piezoelectric chips 109, two pressure blocks 108, the mu balanced circuits 104 disposing box 6 inwall；
Signal condition amplifying circuit, the 3.3v low-voltage and low-power dissipation single-chip microcomputer stc12le5608ad with a/d translation function, wireless transmit
Module nrf24l01, rectification circuit are both placed in disposing in box.Box is disposed to be connected with axle sleeve, with axle sleeve, main shaft synchronous rotary.With
The rotation of main shaft, piezoelectric chip is subject to the extruding of centrifugal force producing from pressure block in the radial direction in main shaft, inside and outside
Side forms the two poles of the earth with positive and negative charge.After the series connection of two piezoelectric chips, the two poles of the earth of two piezoelectric chip positive and negative charges connect to
Mu balanced circuit.The output of mu balanced circuit respectively with signal condition amplifying circuit, with a/d translation function 3.3v low-voltage and low-power dissipation
Single-chip microcomputer stc12le5608ad, wireless transmitter module nrf24l01 are connected, to its power supply.
On the basis of not changing function, corresponding equivalence replacement is carried out to each ingredient of this technology patent, is also this
The protection domain of item technology.
Claims (3)
1. the mechanical seal face friction torque measurement apparatus based on piezoelectric effect and wireless data transmission, including the same mother in two ends
The axle sleeve that u shape mouth is offered on line, the trundle being connected on main shaft through u shape mouth, force transducer, signal processor, wireless
Transmitter module, wireless receiving module, self-powered module；Main shaft passes through axle sleeve, and the mechanical seal of end face friction torque to be measured wears
On axle sleeve, rotating ring is connected on axle sleeve, and stationary ring is fixed on annular seal space；It is characterized in that: the dynamic and static ring of described mechanical seal
The moment of torsion being produced due to end-face friction, is balanced each other by the moment of torsion that trundle passes to axle sleeve with main shaft；This moment of torsion is by pasting
The peripheral force that force transducer on trundle records and the product of the arm of force of force-detecting position determine, the peripheral force surveyed is by signal
Reason device processes and transmits to wireless receiving module through wireless transmitter module；Passed through certainly using the electric energy that main shaft or axle sleeve rotation produce
Supply module is powered to signal processor and wireless transmitter module；
Described self-powered module includes piezoelectric chip, pressure block and the mu balanced circuit following main shaft rotation；When piezoelectric chip exists
Radially it is subject to when the extruding of pressure block rotating with main shaft, inside can produce polarization phenomena, makes charged ion that relative displacement to occur,
Thus the contrary electric charge of symbol equal in magnitude is produced on plane of crystal form two poles, it is treated as stable through mu balanced circuit
DC source.
2. the mechanical seal face friction torque measurement dress based on piezoelectric effect and wireless data transmission as claimed in claim 1
Put, it is characterized in that, main shaft end is wrapped using enclosed construction by described sleeve end, its sleeve end connects an arrangement
Box, is built-in with signal processor, wireless transmitter module, mu balanced circuit, piezoelectric chip and pressure block；The periphery of piezoelectric chip sticks
It is affixed on the inner hole wall disposing box, pressure block sticks on the medial wall of piezoelectric chip.
3. the mechanical seal face friction torque measurement dress based on piezoelectric effect and wireless data transmission as claimed in claim 1
Put, it is characterized in that, circumferentially place respectively uniformly on the cross section of axle between the described two ends of axle sleeve and main shaft 3 or with
On ball.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610877966.2A CN106353024B (en) | 2015-01-15 | 2015-01-15 | Mechanical seal face friction torque measuring device based on piezoelectric effect power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610877966.2A CN106353024B (en) | 2015-01-15 | 2015-01-15 | Mechanical seal face friction torque measuring device based on piezoelectric effect power supply |
| CN201510020807.6A CN104655342B (en) | 2015-01-15 | 2015-01-15 | Mechanical seal face friction torque measurement apparatus based on self-powered and wireless data transmission |
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| CN201510020807.6A Division CN104655342B (en) | 2015-01-15 | 2015-01-15 | Mechanical seal face friction torque measurement apparatus based on self-powered and wireless data transmission |
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| CN106353024A true CN106353024A (en) | 2017-01-25 |
| CN106353024B CN106353024B (en) | 2019-05-07 |
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| CN201610877966.2A Active CN106353024B (en) | 2015-01-15 | 2015-01-15 | Mechanical seal face friction torque measuring device based on piezoelectric effect power supply |
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| CN107664549A (en) * | 2017-11-23 | 2018-02-06 | 南京林业大学 | Mechanical seal face friction torque device for accurately measuring |
| CN110594417A (en) * | 2019-10-14 | 2019-12-20 | 中国石油大学(华东) | Axial sealing static ring device capable of being used for monitoring friction torque |
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| CN105424244B (en) * | 2015-11-19 | 2018-10-16 | 青岛理工大学 | A kind of contactless self-generating wireless torque sensor |
| CN105973512B (en) * | 2016-06-22 | 2018-09-04 | 大连理工大学 | A kind of self-generating wireless transmission piezoelectric type torque dynamometer |
| CN109060210B (en) * | 2018-09-03 | 2020-09-18 | 北京控制工程研究所 | Bearing friction torque measuring method and system based on piezoelectric ceramics |
| CN112729650B (en) * | 2021-02-04 | 2022-08-23 | 浙江师范大学 | Self-powered torque monitoring device |
| CN114123844B (en) * | 2021-11-26 | 2023-05-19 | 浙江师范大学 | Self-powered monitoring system for friction energy harvesting |
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| CN104655342B (en) | 2017-07-14 |
| CN104655342A (en) | 2015-05-27 |
| CN106353024B (en) | 2019-05-07 |
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