CN205679634U - A kind of pipeline stream flow monitoring instrument - Google Patents

Abstract

The utility model relates to a kind of pipeline stream flow monitoring instrument, belongs to fluid inspection field.Inner-walls of duct through gusset equipped with inner core, the left chamber of inner core equipped with circuit board, end equipped with left end cap；The force application rod left end bar of end band driver stretches out through left end cap；It is cased with the force application rod right-hand member bar of balancing spring to be placed on dividing plate in pilot hole and end is equipped with cushion pad；Right cavity inner sleeve has the transducer being made up of balladeur train and piezoelectric vibrator, and piezoelectric vibrator is formed by metal substrate and piezoelectric chip bonding；It is provided with isolating pad between the adj acent piezoelectric oscillator of two transducers；The piezoelectric vibrator at two ends, right chamber contacts with the cushion pad on right-hand member bar and right end cap respectively.Advantage characteristic: utilize driver generate electricity with fluid coupling and realize that flow velocity is measured automatically, can realize that the flow velocity of real meaning is monitored in real time；Along pipe lengths configuration, simple in construction, radial dimension are little, be easy to obtain required energy by using multi-transducer；Piezoelectric vibrator is rational in infrastructure and has self-protection function, and generated energy is big, reliability is high.

Description

A kind of pipeline stream flow monitoring instrument

Technical field

The utility model belongs to fluid flow state monitoring technical field, is specifically related to a kind of pipeline stream flow monitoring instrument.

Background technology

Flow by the petroleum and natural gas that the reasons such as spontaneous corrosion, nature force majeure and artificial pilferage are caused etc. Body long distance pipeline happens occasionally in the incident of leakage of the process of use, and pipe leakage not only causes huge economic damage frequently Lose, also cause serious pollution to its periphery natural environment simultaneously.In the past, the method frequently with regular manual inspection was tieed up Protect, but because oil and gas pipes lays distance and is often in uninhabited or part of having inconvenient traffic, regular visit is difficult to find in time Leakage is simultaneously safeguarded.Therefore, there has been proposed polytype for line leakage or burglary-resisting system.Although being proposed Some pipe leakage or anti-theft monitoring alarm method at technological layer with more ripe, but long distance pipeline anti-theft monitoring system of current China The application of system is also in elementary step, the long-pending popularization and application not yet obtaining big face, and its one of the main reasons is the confession of monitoring system Electricity problem fails to be well solved: 1) uses the method cost laying cable high and is easily cut off by lawless person and affect prison Examining system properly functioning；2) using battery to use limited time when powering, need to often change, once battery electric quantity is not enough and not Also the remote transmission of monitoring information cannot be completed when changing in time；3) in recent years, for meeting related wireless sensing monitoring system Self-powered demand, people also proposed the turbine type microminiature TRT of various ways, the problem of its maximum be structure complicated, Volume is relatively large, is unsuitable for the less occasion of pipe diameter, and the TRT of some structure there is also the phenomenons such as electromagnetic interference, Popularization and application have received certain restriction.Therefore, for making petroleum and natural gas pipe leakage and burglary-resisting system be used practically, Need to first solve its powerup issue.

Content of the invention

Power the problem existing for aspect for existing pipeline fluid condition monitoring system, the utility model proposes a kind of pipe Road stream flow monitoring instrument.The utility model adopted implementation scheme is that inner-walls of duct is fixed with inner core, pipeline, gusset through gusset And inner core constitutes main body frame；Being provided with dividing plate inside inner core barrel, inner core is separated into left chamber and right chamber by dividing plate；Dividing plate is provided with Pilot hole and cable hole；Being fixed with the circuit board with transmitter unit through screw in left chamber, end, left chamber is provided with left end through screw Lid；Force application rod is divided into left end bar and right-hand member bar by the shaft shoulder on force application rod；Left end bar stretches out left chamber, left end through left end cap centre bore Boom end is provided with driver through nut；Being cased with balancing spring on right-hand member bar, right-hand member bar is placed in the pilot hole on dividing plate, right-hand member Boom end is equipped with cushion pad；Right cavity inner sleeve has transducer, the piezoelectricity that transducer is installed by balladeur train and balladeur train toroidal membrane both sides Oscillator is constituted, and piezoelectric vibrator is connected with the toroidal membrane of balladeur train through screw；Piezoelectric vibrator is by metal substrate and piezoelectric chip bonding Form；In one transducer, the metal substrate of two piezoelectric vibrators is near installation, the adj acent piezoelectric oscillator of two adjacent transducer Between be provided with isolating pad；The piezoelectric vibrator at two ends, left and right, right chamber contacts with the cushion pad on right-hand member bar and right end cap respectively；Respectively Between piezoelectric vibrator through wire parallel with one another after be connected with circuit board again, parallel connection refer between each piezoelectric chip through wire phase interconnection Connect, be connected with each other through wire between each metal substrate.

During work, when having fluid to flow through driver, between fluid and driver, generation is interacted.In some condition The whirlpool that alternately can come off on the contrary and periodically in driver two row direction of rotation formed behind when lower fluid flows through driver, Alternately coming off of whirlpool can cause the alternately change of fluid pressure, even if the fluid pressure differential of both sides alternately becomes before and after driver Change, so that driver produces the of reciprocating vibration of left and right directions.For the utility model, the left and right of driver is of reciprocating vibration through executing Power bar, cushion pad and isolating pad force piezoelectric vibrator to produce flexural deformation, thus convert mechanical energy into electric energy；Generated electricity Through energy conversion and the storage circuit of wire transmission to circuit board, power for signal transmitter unit；Meanwhile, piezoelectric vibrator is generated The quantity of voltage waveform be also extracted, be used for characterizing rate of flow of fluid signal, rate of flow of fluid signal is launched unit and launches Go out.

In the utility model, for making piezoelectric vibrator effectively to be encouraged, should meet when monitor works under nominal flow rate: Exciting force F suffered by piezoelectric vibrator_pEqual to fluid force F suffered by force application rod_lWith equilibrium bomb spring force F_sDifference, i.e. F_p=F_l-F_s, pressure The quiet deflection at electric tachometer indicator center is the half of its deflection allowable, and driver a diameter of D=(200～5000) μ/(ρ v₀), In formula D be the diameter of driver, ρ be fluid density, μ be fluid kinematic viscosity, v₀For nominal flow rate.

In the utility model, the flow velocity of fluids within pipes is by the generation voltage waveform quantity table of piezoelectric vibrator in the unit interval Levy, be v=f_lD/S_t, S in formula_tFor the coefficient related to structure and fluid, D is driver diameter, f_lFlow through excitation for fluid Vibration frequency caused during device, the voltage wave figurate number being generated in the unit interval.

In the utility model, for improving the generating capacity of piezoelectric vibrator h, metal substrate is the beryllium-bronze of 0.2mm thickness, pressure Electricity wafer is the PZT4 of thickness 0.3mm；The effective radius R of metal substrate_mWhen given, the radius R of rational piezoelectric chip 2_pBy pressing The energy meter formula of electric tachometer indicatorDerivative try to achieve, i.e. byTry to achieve, formula Middle δ is the caused piezoelectric vibrator center deformation amount of driver vibration, K_pFor piezoelectric vibrator rigidity, and

$K_p=\frac{1.9237(1+0.4242\frac{R_p^2}{R_m^2})(1-\frac{R_p^2}{R_m^2})}{1.7249R_p^2\{(0.5082\frac{R_p^2}{R_m^2}-1)(1+0.1789\frac{R_p^2}{R_m^2})+1.2196\ln \left(\frac{R_p}{R_m}\right)(1-\frac{R_p^2}{R_m^2})\[1-0.675ln\left(\frac{R_p}{R_m}\right)\]\}+R_m^2}.$

Advantage and characteristic: 1) utilize driver generate electricity with the coupling of fluid and realize that flow velocity is measured automatically, it is not necessary to outer The supply of boundary energy and sensor, without electromagnetic interference, the flow velocity real time on-line monitoring of real meaning can be realized；2) driver and transducing Device configures along pipe lengths, and simple in construction, radial dimension are little, be easy to obtain required energy by using multi-transducer；3) Piezoelectric vibrator is rational in infrastructure and under the conditions of being only operated in compression, therefore generated energy is big, reliability is high；4) transducer has self-insurance Protective function, i.e. when exciting force reaches to a certain degree in transducer two metal substrates contact with each other, piezoelectric vibrator deflection not It is further continued for increasing.

Brief description

Fig. 1 is the structural representation of monitor in one preferred embodiment of the utility model；

Fig. 2 is the left view of Fig. 1；

Fig. 3 is the structural representation of main body frame in one preferred embodiment of the utility model；

Fig. 4 is the structural representation of transducer in one preferred embodiment of the utility model；

Fig. 5 is that in one preferred embodiment of the utility model, piezoelectric vibrator generated energy is bent with the relation of piezoelectric chip radius Line.

Detailed description of the invention

Being fixed with inner core c through gusset b on the inwall of pipeline a, pipeline a, gusset b and inner core c constitute main body frame K；Inner core c Barrel c1 inside be provided with dividing plate c2, inner core c is separated into left chamber c3 and right chamber c4 by dividing plate c2；Dividing plate c2 is provided with pilot hole c5 With cable hole c6；Being fixed with the circuit board d with transmitter unit P through screw in left chamber c3, c3 end, left chamber is provided with a left side through screw End cap k；Force application rod m is divided into left end bar m2 and right-hand member bar m3 by the shaft shoulder m1 on force application rod m；Left end bar m2 is through in left end cap k Left chamber c3 is stretched out in heart hole, and left end bar m2 end is provided with driver n through nut p；It is cased with balancing spring j, right-hand member on right-hand member bar m3 Bar m3 is placed in the pilot hole c5 on dividing plate c2, and right-hand member bar m3 end is provided with cushion pad e；The two ends, left and right of balancing spring j are divided Do not act against on the shaft shoulder m1 and dividing plate c2 of force application rod m；C4 end, right chamber is provided with right end cap g through screw, and right end cap g inlays There is cushion pad e；It is cased with transducer H, the pressure that transducer H is installed by the toroidal membrane i1 both sides of balladeur train i and balladeur train i in right chamber c4 Electric tachometer indicator h is constituted, and piezoelectric vibrator h is connected with the toroidal membrane i1 of balladeur train i through screw；Piezoelectric vibrator h is by metal substrate h1 and pressure Electricity wafer h2 bonding forms；In one transducer H, the metal substrate h1 of two piezoelectric vibrator h is near installation, two adjacent transducings It is provided with isolating pad f between the adj acent piezoelectric oscillator h of device H；In right chamber c4 high order end and low order end piezoelectric vibrator h respectively with right-hand member bar Cushion pad e on m3 and right end cap g contacts；Between each piezoelectric vibrator h through wire parallel with one another after be connected with circuit board d again, Parallel connection refers to be connected with each other through wire, be connected with each other through wire between each metal substrate h1 between each piezoelectric chip h2.

During work, when having fluid to flow through driver n, between fluid and driver n, generation is interacted.At some Can be at driver n two row direction of rotation formed behind whirlpool that is contrary and that periodically alternately come off when under part, fluid flows through driver n Whirlpool, alternately coming off of whirlpool can cause the alternately change of fluid pressure, even if the fluid pressure differential of both sides replaces before and after driver n Ground change, so that driver n produces the of reciprocating vibration of left and right directions.For the utility model, the left and right of driver n back and forth shakes Move and force piezoelectric vibrator h to produce flexural deformation through force application rod m, cushion pad e and isolating pad f, thus convert mechanical energy into electric energy； Generated electricity is changed and storage circuit through the energy of wire transmission to circuit board d, is that signal transmitter unit P powers；Meanwhile, press The quantity of the voltage waveform that electric tachometer indicator h is generated also is extracted, and is used for characterizing rate of flow of fluid signal, rate of flow of fluid signal quilt Transmitter unit P launches.

In the utility model, for making piezoelectric vibrator h effectively to be encouraged, should expire when monitor works under nominal flow rate Foot: exciting force F suffered by piezoelectric vibrator h_pEqual to fluid force F suffered by force application rod m_lWith equilibrium bomb spring force F_sDifference, i.e. F_p=F_l- F_s, the quiet deflection at the center of piezoelectric vibrator h is the half of its maximum allowable deflection, and a diameter of D=(200 of driver n ～5000) μ/(ρ v₀), in formula D be the diameter of driver, ρ be fluid density, μ be fluid kinematic viscosity, v₀For nominal flow rate.

In the utility model, the flow velocity of fluids within pipes is by the generation voltage waveform quantity table of piezoelectric vibrator in the unit interval Levy, be v=f_lD/S_t, S in formula_tFor the coefficient related to structure and fluid, D is driver diameter, F_lFlow through excitation for fluid Vibration frequency caused during device, the voltage wave figurate number being generated in the unit interval.

In the utility model, for improve piezoelectric vibrator h generating capacity, metal substrate h1 be 0.2mm thickness beryllium-bronze, Piezoelectric chip h2 is the PZT4 of thickness 0.3mm；The effective radius R of metal substrate h1_mWhen given, the half of rational piezoelectric chip h2 Footpath R_pBy the energy meter formula of piezoelectric vibrator hDerivative try to achieve, i.e. byTrying to achieve, in formula, δ is the deflection of the caused piezoelectric vibrator h central point of driver n vibration, K_pShake for piezoelectricity The rigidity of sub-h, and

$K_p=\frac{1.9237(1+0.4242\frac{R_p^2}{R_m^2})(1-\frac{R_p^2}{R_m^2})}{1.7249R_p^2\{(0.5082\frac{R_p^2}{R_m^2}-1)(1+0.1789\frac{R_p^2}{R_m^2})+1.2196\ln \left(\frac{R_p}{R_m}\right)(1-\frac{R_p^2}{R_m^2})\[1-0.675ln\left(\frac{R_p}{R_m}\right)\]\}+R_m^2}.$

Obviously, the utility model is to utilize driver generate electricity with the coupling of fluid and realize that flow velocity is measured automatically, nothing Need outside energy supply and sensor, without electromagnetic interference, the flow velocity real time on-line monitoring of real meaning can be realized；Driver and changing Can device configure along pipe lengths, simple in construction, radial dimension are little, be easy to obtain required energy by using multi-transducer； Piezoelectric vibrator is rational in infrastructure and under the conditions of being only operated in compression, therefore generated energy is big, reliability is high；Transducer has self-shield Function, i.e. when exciting force reaches to a certain degree in transducer two metal substrates contact with each other, piezoelectric vibrator deflection no longer Continue to increase.

Claims (1)

1. a pipeline stream flow monitoring instrument, it is characterised in that: inner-walls of duct is fixed with inner core through gusset, be provided with inside inner core every Plate, inner core is separated into left chamber and right chamber by dividing plate, and dividing plate is provided with pilot hole and cable hole；It is fixed with band through screw in left chamber to send out Penetrating the circuit board of unit, end, left chamber is provided with left end cap through screw；The shaft shoulder on force application rod force application rod is divided into left end bar and Right-hand member bar；Left end bar stretches out left chamber through left end cap centre bore, and left end boom end is provided with driver through nut；It is cased with on right-hand member bar Balancing spring, right-hand member bar is placed in the pilot hole on dividing plate Nei and end equipped with cushion pad；Right cavity inner sleeve has transducer, transducer by The piezoelectric vibrator that balladeur train and balladeur train toroidal membrane both sides are installed is constituted, and piezoelectric vibrator is by metal substrate and piezoelectric chip bonding Become；In one transducer two piezoelectric vibrators metal substrate near install, the adj acent piezoelectric oscillator of two adjacent transducer it Between be provided with isolating pad；In right chamber, the piezoelectric vibrator at two ends, left and right contacts with the cushion pad on right-hand member bar and right end cap respectively.