CN205681346U - A kind of from limit telescopic oscillatory type pipe generator - Google Patents

Abstract

The utility model relates to a kind of from limit telescopic oscillatory type pipe generator, belongs to oil and gas pipes monitoring field.Pipeline is built with housing, and shell end is equipped with end cap, and force application rod is divided into left and right end bar by flange, and right-hand member bar is cased with disc spring, and disc spring is pressed at the bottom of shell by flange；Be cased with sliding sleeve on left end bar, equipped with jump ring and sharp plate；Piezoelectric vibrator is formed by metal substrate and piezoelectric chip bonding, and substrate right-hand member is fixed on force application rod flange, left end is fixed on end cap boss, centre is fixed on sliding sleeve；It is the distance between flat construction and its length are equal at the bottom of end cap and shell before piezoelectric vibrator assembling, become warp architecture after installation and piezoelectric chip bears compression.Characteristic and advantage: straight piezoelectric vibrator becomes warp architecture by the method installed, form the TRT along pipe lengths stretching vibration, structure and technique is simple, low cost；Piezoelectric chip is only by the compression of range-controllable, and reliability is high；Easily improve generated energy by increasing piezoelectric vibrator number and length.

Description

A kind of from limit telescopic oscillatory type pipe generator

Technical field

The utility model belongs to oil and gas pipes monitoring system and field of piezoelectric generation, is specifically related to one and shakes from limit telescopic Dynamic formula pipe generator.

Background technology

Have during the gas oil pipe leakage event causing because of spontaneous corrosion, nature force majeure, especially artificial pilferage etc. Occur, not only cause huge economic loss, also cause serious pollution to its periphery natural environment simultaneously.In the past, often Oil-gas pipeline is safeguarded by the method using regular manual inspection, but because of its lay distance and be often in uninhabited or In place of having inconvenient traffic, regular visit is difficult to find leakage on-call maintenance in time, therefore there has been proposed polytype pipeline and let out Leakage monitoring or burglary-resisting system.Though some pipe leakage being proposed or anti-theft monitoring alarm method are more ripe at technological layer, But the application of current China long distance pipeline anti-theft monitoring system is also in the starting stage, be not yet used widely, its reason it One is that its powerup issue is not well solved: use the method cost laying cable high and easily cut off by lawless person and Affect the properly functioning of monitoring system；And use limited time when using battery to power, need to often change, once battery electric quantity is not Also the remote transmission of monitoring information cannot be completed when foot and not replacing in time.Therefore, for making gas oil pipe leakage and burglary-resisting system It is used practically, it is necessary to first solve its powerup issue.In recent years, for meeting the self-powered of all kinds of wireless sensing monitoring system Demand, there has been proposed a kind of novel miniature piezoelectric TRT, and it has simple in construction, does not generates heat, without electromagnetic interference, collection One-tenthization high, is particularly suited for wireless sensing monitoring system power supply.But, existing oil and gas pipes piezoelectric generating device is mostly Being rotated by fluid turbine and driving piezoelectric vibrator generating, structure is complicated, volume is big, is unsuitable for the relatively small pipeline of diameter； Meanwhile, in work piezoelectric vibrator compound bending deformation, bear and alternately draw-compression, when tension is excessive piezoelectric chip broken, Reliability is low.

Content of the invention

The limitation applied for a power supply difficult problem and the existing piezoelectric generating device of oil/gas pipe line monitoring, this practicality Novel proposition is a kind of from limit telescopic oscillatory type pipe generator.The utility model adopted implementation scheme is that inner-walls of duct warp Left and right disc is provided with housing, is provided with counterbore at the bottom of shell；Shell end is provided with boss through screw equipped with end cap, end cap；Flange Force application rod being divided into left end bar and right-hand member bar, right-hand member bar being cased with disk spring, disk spring is pressed at the bottom of shell by flange, right-hand member Boom end is placed in the counterbore at the bottom of shell；Being cased with sliding sleeve on left end bar, being provided with spacing jump ring, left end bar is through the guiding on end cap Hole is stretched out, and left end boom end is provided with sharp plate through nut；Piezoelectric vibrator is formed by metal substrate and uniform piezoelectric chip bonding, The right-hand member of metal substrate through screw and briquetting be fixed on the flange of force application rod, left end is fixed on end cap boss through screw and briquetting On, middle part is fixed on sliding sleeve through screw and briquetting；It is flat construction and its length under nature before piezoelectric vibrator assembling Equal to the distance between at the bottom of end cap and shell；Piezoelectric vibrator becomes warp architecture after installing and the radius of curvature of piezoelectric chip is less than base The radius of curvature of plate, piezoelectric chip bears compression；Be placed between end cap and sliding sleeve adjacent thereto, between two adjacent sliding sleeves and Each piezoelectric vibrator at the bottom of shell and between sliding sleeve adjacent thereto respectively constitutes generator unit.

When after generator is installed and flowing through sharp plate without fluid, spacing jump ring acts against on end cap, the decrement of generator unit Maximum, piezoelectric chip institute compression chord maximum；After having fluid to flow through sharp plate, hydrodynamic pressure makes to swash plate and force application rod moves to right, Forcing the elongation of each generator unit, disk spring to shorten, spacing jump ring departs from end cap and the decrement of generator unit is its inoperative When half；For meeting this condition, the stiffness K of disk spring_sWith natural length L_sIt is respectively K_s=(S ρ v²μ_l-N_rK_pδ)/(δ N_z) and L_s=Δ LN_z(N_zK_s+N_rK_p)/(N_zK_s), in formula: N_zAnd N_rIt is respectively in quantity and the single generator unit of generator unit Piezoelectric vibrator number in parallel, the decrement of generator unit, K when δ is inoperative_pStretching for piezoelectric vibrator single in generator unit Rigidity, S is for swashing the surface area of plate, v and ρ is respectively rate of flow of fluid and density, μ_lIt for related to Reynolds number and structure dimension is Number.

In the course of work, when i.e. having fluid to flow through sharp plate, sharp plate will produce vortex-induced vibration under action of a fluid, and pass through Force application rod forces each generator unit to produce stretching vibration: when force application rod moves right, the elongation of each generator unit, disk spring contracting Short, piezoelectric chip institute compression chord reduces；Otherwise, force application rod is when left movement, and each generator unit shortens, disk spring elongation, Piezoelectric chip institute compression chord increases, and maximum crushing stress is determined by the position of spacing jump ring；What above-mentioned each generator unit replaced stretches During long-shortening, piezoelectric chip bears rational compression all the time, and reliability is high；Accidental flow velocity increases severely makes piezoelectric vibrator Elongation reaches maximum, when i.e. reaching straightened condition, disk spring will be crushed to death, fluid force is applied directly at the bottom of shell.

Advantage and characteristic: 1. straight piezoelectric vibrator is become warp architecture by the method by installing, and is formed along duct length The TRT of direction stretching vibration, structure and manufacture craft are simple, low cost；2. piezoelectric chip is only operated in compressive stress state Under and compression range-controllable, reliability is high；3. it is easy to improve generating by the method increasing piezoelectric vibrator quantity and length Amount.

Brief description

Fig. 1 is the section of structure of generator in one preferred embodiment of the utility model；

The A-A view of Fig. 2 Fig. 1；

Fig. 3 is the structural representation installing front piezoelectric vibrator in one preferred embodiment of the utility model；

Fig. 4 is the structural representation of main body in one preferred embodiment of the utility model.

Detailed description of the invention

Pipeline a inwall is provided with housing c through left disc b and right disc b ', and d at the bottom of shell is provided with counterbore e；Housing c end warp Screw is provided with boss j1 equipped with end cap j, end cap j；Force application rod f is divided into left end bar f2 and right-hand member bar f3, right-hand member bar by flange f1 Being cased with disk spring h on f3, disk spring h is pressed on d at the bottom of shell by flange f1, the counterbore e that right-hand member bar f3 portion is placed on d at the bottom of shell In；Being cased with sliding sleeve n on left end bar f2, being provided with spacing jump ring p, left end bar f2 stretches out through the pilot hole on end cap j, left end bar f2 End is provided with sharp plate k through nut m；Piezoelectric vibrator i is formed by metal substrate i1 and uniform piezoelectric chip i2 bonding, Metal Substrate The right-hand member of plate i1 through screw and briquetting g be fixed on the flange f1 of force application rod f, left end is fixed on end cap j's through screw and briquetting g On boss j1, middle part is fixed on sliding sleeve n through screw and briquetting g；It is straight knot under nature before piezoelectric vibrator i assembling Structure and its length L1 are equal to distance L2 between d at the bottom of end cap j and shell；Piezoelectric vibrator i becomes warp architecture and piezo crystals after installing The radius of curvature less than substrate i1 for the radius of curvature of piece i2, piezoelectric chip i2 bears compression；It is placed in end cap j and cunning adjacent thereto Overlap between n, between two adjacent sliding sleeve n and each piezoelectric vibrator i between d and sliding sleeve n adjacent thereto at the bottom of shell respectively constitutes generating list Unit Q.

When after generator is installed and flowing through sharp plate k without fluid, spacing jump ring p acts against on end cap j, the pressure of generator unit Q Contracting amount is maximum, piezoelectric chip i2 institute compression chord is maximum；After having fluid to flow through sharp plate k, hydrodynamic pressure makes to swash plate k and force Bar f moves to right, and forces each generator unit Q elongation, disk spring h to shorten, and spacing jump ring p departs from the pressure of end cap j and generator unit Q Contracting amount is half during its inoperative；For meeting this condition, the stiffness K of disk spring_sWith natural length L_sIt is respectively K_s=(S ρv²μ_l-N_rK_pδ)/(δN_z) and L_s=Δ LN_z(N_zK_s+N_rK_p)/(N_zK_s), in formula: N_zAnd N_rBe respectively generator unit Q quantity and The quantity of piezoelectric vibrator i in parallel in single generator unit, the decrement of generator unit Q, K when δ is inoperative_pFor generator unit The flexible rigidity of single piezoelectric vibrator i in Q, S is for swashing the surface area of plate k, v and ρ is respectively rate of flow of fluid and density, μ_lFor with thunder The coefficient that promise number and structure dimension are related to.

In the course of work, when i.e. having fluid to flow through sharp plate k, swash plate k and will produce vortex-induced vibration under action of a fluid, and lead to Crossing force application rod f forces each generator unit Q to produce stretching vibration: when force application rod f moves right, each generator unit Q elongation, dish Spring h shortens, and piezoelectric chip i2 institute compression chord reduces；Otherwise, force application rod f is when left movement, and each generator unit Q shortens, dish Shape spring h extends, and piezoelectric chip i2 institute compression chord increases, and maximum crushing stress is determined by the position of spacing jump ring p；Above-mentioned each During electric unit Q elongation-shortening alternately, piezoelectric chip i2 bears rational compression all the time, and reliability is high；Accidental stream Speed increases severely makes piezoelectric vibrator i elongation reach maximum, when i.e. reaching straightened condition, disk spring h will be crushed to death, fluid force is directly made Use on d at the bottom of shell.

Claims (1)

1. one kind from limit telescopic oscillatory type pipe generator, it is characterised in that: inner-walls of duct is provided with housing through left and right disc, It is provided with counterbore at the bottom of shell；Shell end is provided with boss equipped with end cap, end cap；Force application rod is divided into left end bar and right-hand member by flange Bar, right-hand member bar is cased with disk spring, and disk spring is pressed at the bottom of shell by flange, and right-hand member boom end is placed in the counterbore at the bottom of shell In；Being cased with sliding sleeve on left end bar, being provided with spacing jump ring, left end bar stretches out through the pilot hole on end cap, and left end boom end is installed There is sharp plate；Piezoelectric vibrator is formed by metal substrate and uniform piezoelectric chip bonding, and metal substrate right-hand member is fixed on force application rod On flange, left end be fixed on end cap boss, middle part is fixed on sliding sleeve；It is flat construction and its length before piezoelectric vibrator assembling Spend the distance between being equal at the bottom of end cap and shell, become warp architecture after installation and piezoelectric chip bears compression.