CN205679601U - A kind of river monitoring device based on piezoelectric stack - Google Patents

Abstract

The utility model relates to a kind of river monitoring device based on piezoelectric stack, belongs to river monitoring field.Shell is made up of conflux pipe and straight tube, and straight tube inwall is respectively provided with turbulent and inner core through gusset one and two, and turbulent is perpendicular with inner core center line；Inner core two ends, equipped with end cap, left end cap are inlaid with sensor one and the 2nd, equipped with the circuit board with transmitter unit；The centre bore of multidiameter left half axle left end cap stretches out, and left half axle end is equipped with driver；Being cased with preloading spring on left half axle, preloading spring acts against on left end cap and the multidiameter right axle shaft shaft shoulder；Right axle shaft is crimped on piezoelectric stack on right end cap by anti-torsion plate.Advantage characteristic: utilize Fluid-solid action to generate electricity, it is not necessary to outside energy, without electromagnetic interference, can realize the real time on-line monitoring of real meaning；Monitoring device simple in construction, radial dimension are little, easily obtain required energy by the series connection of many piezoelectric stacks；Generator unit structural parameters rationally, energy conversion efficiency and reliability high.

Description

A kind of river monitoring device based on piezoelectric stack

Technical field

The utility model belongs to river monitoring technical field, is specifically related to a kind of river monitoring dress based on piezoelectric stack Put.

Background technology

The river that China spreads all within the border reaches thousands of more than.In recent years, owing to industrial waste sewage strength disposal is inadequate, water and soil The reasons such as loss and the improper use such as agricultural chemicals and chemical fertilizer, all there is a certain degree of pollution problem, the river of nearly 1/4 in major part river Stream or section can not meet basic irrigation demand because of pollution.Further, since a lot of at present areas middle and small river flood control installation Imperfection, even without any flood control installation, may cause inrushing or overflowing the danger such as dike when arriving flood season, directly threaten edge The safety of life and property of the bank masses.Therefore, river monitoring is paid much attention to by national correlation department, water during 12 The just once plan of profit portion realizes more than the 5000 bar rivers determining " middle and small river is administered and Small Reservoir reinforcement ad hoc planning " Monitoring all standing；Meanwhile, domestic experts and scholars also propose corresponding monitoring method and means in succession, including dirty for river The water quality monitoring technology of dye, for monitoring skills such as the rainfall of flood control and the natural calamity such as mud-rock flow, water level and urban river water flow velocitys The many-sides such as art.Although some monitoring method being proposed is more ripe at technological layer, but not yet obtain the long-pending of big face at present Popularization and application, its one of the main reasons is that monitoring system power supply problem is not well solved.

Content of the invention

For the problem existing for existing river monitoring system power supply aspect, the utility model proposes a kind of based on piezo stack The river monitoring device of heap.The utility model adopted implementation scheme is that shell is made up of conflux pipe and straight tube, on straight tube inwall Being fixed with cylindrical turbulent through gusset one, being fixed with square inner core through gusset two, turbulent is mutually vertical with the center line of inner core Directly；It is provided with support outside straight tube；Two ends, inner core left and right are provided with left end cap and right end cap through screw respectively, and left end cap is inlaid with The 2nd, sensor one and sensor are provided with the circuit board of transmitter unit through screw；The left half axle of multidiameter is through in left end cap Heart hole is stretched out from inner core, and left half axle end is provided with driver；It is cased with preloading spring, two ends, preloading spring left and right on left half axle Acting against respectively on the right axle shaft shaft shoulder of left end cap and multidiameter, right axle shaft end is sphere；Right axle shaft passes through square anti-torque plate Being crimped on piezoelectric stack on right end cap, square anti-torque plate periphery contacts with inner core inwall；Piezoelectric stack and preloading spring Equal stiffness, the pretightning force of piezoelectric stack is 10%～30% that it can bear maximum pressure.

During work, when having fluid to flow through turbulent, between fluid and turbulent, generation is interacted.In some condition Under, the whirlpool that alternately can come off on the contrary and periodically in turbulent two row direction of rotation formed behind when fluid flows through turbulent, What alternately the coming off of whirlpool can cause the fluid pressure between turbulent with driver replaces change, so that before and after driver two The fluid pressure differential of side alternately changes, and alternately the fluid pressure of change makes driver generation left and right of reciprocating vibration.For this reality With novel, the left and right of driver is of reciprocating vibration drives piezoelectric stack dilatation through multidiameter, thus converts mechanical energy into electricity Energy；Generated electricity through the energy conversion of wire transmission to circuit board and storage circuit, be sensor one and two and signal launch Unit is powered, and fluid relevant information is launched by transmitter unit.

In the utility model, for making piezoelectric stack effectively to be encouraged, piezoelectricity when monitoring device works under Peak Flow Rate The static compression amount stacking is the half of its maximum compressible amount；The electricity that fluid actual flow velocity is generated by piezoelectric stack in the unit interval Corrugating quantity characterizes, i.e. v=f_lD/S_t, S in formula_tFor the coefficient related to structure and fluid, f_lPiezoelectricity caused by fluid The voltage wave figurate number being generated in the stretching frequency that stacks, i.e. unit interval, D=(200～5000) μ/(ρ v₀) it is that turbulent is straight Footpath, ρ is fluid density, and μ is fluid kinematic viscosity, v₀For Peak Flow Rate.

Advantage and characteristic: utilize turbulent and driver generate electricity with the coupling of fluid and realize monitoring automatically, it is not necessary to Outside energy supply, without electromagnetic interference, the real time on-line monitoring of real meaning can be realized；Monitoring device simple in construction, radial ruler Spend little, easily by the required energy of many piezoelectric stacks series connection acquisition；Generator unit structural parameters rationally, energy conversion efficiency and reliable Property high.

Brief description

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

Fig. 2 is the A-A sectional view of Fig. 1；

Fig. 3 is the I portion enlarged drawing of Fig. 1.

Detailed description of the invention

Shell a is made up of conflux pipe a1 and straight tube a2, on straight tube a2 inwall through gusset b1 be fixed with cylindrical turbulent m, Being fixed with square inner core e through gusset b2, turbulent m is mutually perpendicular to the center line of inner core e；The outside of straight tube a2 is provided with support c； The two ends, left and right of inner core e are provided with left end cap k and right end cap g through screw respectively, and left end cap k is inlaid with sensor one S1 and biography Sensor two S2, the circuit board d being provided with transmitter unit P through screw；The left half axle h1 of multidiameter h is through the centre bore of left end cap k Stretching out from inner core e, left half axle h1 end is provided with driver j；It is cased with preloading spring i, a left side of preloading spring i on left half axle h1 On the shaft shoulder of the right axle shaft h2 that right two ends act against left end cap k and multidiameter h respectively, the end of right axle shaft h2 is sphere, right half Piezoelectric stack f is crimped on right end cap g by square anti-torque plate x by axle h2, the periphery of square anti-torque plate x and the inwall of inner core e Contact with each other；Piezoelectric stack f and the equal stiffness of preloading spring i, the pretightning force of piezoelectric stack f is that it can bear maximum pressure 10%～30%.

During work, when having fluid to flow through turbulent m, between fluid and turbulent m, generation is interacted.At some Under part, alternately can come off on the contrary and periodically in turbulent m two row direction of rotation formed behind when fluid flows through turbulent m Whirlpool, what alternately the coming off of whirlpool can cause the fluid pressure between turbulent m with driver j replaces change, so that excitation Before and after device j, the fluid pressure differential of both sides alternately changes, and alternately the fluid pressure of change makes back and forth to shake about driver j generation Dynamic.For the utility model, the left and right of driver j is of reciprocating vibration drives piezoelectric stack f dilatation through multidiameter h, thus will Mechanical energy is converted into electric energy；Generated electricity is changed and storage circuit through the energy of wire transmission to circuit board d, is sensor one S1, sensor two S2 and signal transmitter unit P power, and fluid relevant information is launched by transmitter unit P.

In the utility model, for making piezoelectric stack f effectively to be encouraged, monitoring device is at Peak Flow Rate v₀Press during lower work The static compression amount that electricity stacks f is the half of its maximum compressible amount；The actual flow velocity of fluid is raw by piezoelectric stack in the unit interval The voltage waveform quantity becoming characterizes, i.e. v=f_lD/S_t, S in formula_tFor the coefficient related to structure and fluid, f_lCaused by fluid The stretching frequency of piezoelectric stack f, the voltage wave figurate number i.e. being generated in the unit interval, D=(200～5000) μ/(ρ v₀) be The diameter of turbulent m, ρ is fluid density, and μ is fluid kinematic viscosity, v₀For Peak Flow Rate.

The utility model utilizes turbulent m and driver j generate electricity with the coupling of fluid and realize monitoring automatically, it is not necessary to Outside energy supply, without electromagnetic interference, the real time on-line monitoring of real meaning can be realized；Monitoring device simple in construction, radial ruler Spend little, easily by the required energy of many piezoelectric stacks series connection acquisition；Generator unit structural parameters rationally, energy conversion efficiency and reliable Property high.

Claims (1)

1. the river monitoring device based on piezoelectric stack, it is characterised in that: shell is made up of conflux pipe and straight tube, in straight tube Being respectively fixed with cylindrical turbulent and square inner core through gusset one and two on wall, turbulent is mutually vertical with the center line of inner core Directly；It is provided with support outside straight tube；Two ends, inner core left and right are provided with left and right end cap through screw respectively, and left end cap is inlaid with sensor One and the circuit board that the 2nd, is provided with transmitter unit through screw；Multidiameter left half axle is stretched from inner core through the centre bore of left end cap Going out, left half axle end is provided with driver；Being cased with preloading spring on left half axle, two ends, preloading spring left and right act against left end respectively On the shaft shoulder of lid and multidiameter right axle shaft, right axle shaft end is sphere；Piezoelectric stack is crimped by right axle shaft by square anti-torque plate On right end cap, anti-torsion plate periphery contacts with inner core inwall.