CN107332469B - A kind of piezoelectric type hospital call signal generator - Google Patents
A kind of piezoelectric type hospital call signal generator Download PDFInfo
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- CN107332469B CN107332469B CN201710729377.4A CN201710729377A CN107332469B CN 107332469 B CN107332469 B CN 107332469B CN 201710729377 A CN201710729377 A CN 201710729377A CN 107332469 B CN107332469 B CN 107332469B
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- 238000005452 bending Methods 0.000 claims abstract description 22
- 239000000758 substrate Substances 0.000 claims abstract description 13
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 238000005192 partition Methods 0.000 claims abstract description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/186—Vibration harvesters
Abstract
The present invention relates to a kind of piezoelectric type hospital call signal generators, belong to medical electric product technical field.Housing sidewall end is connected with the upper cover with through-hole, and upper Gai Shangjing washer is equipped with circuit board, which is provided with power conversion circuits and signal transmitting system；Oscillator pedestal is connected in housing sidewall, one group of piezoelectric vibrator is installed through pressing plate on oscillator pedestal, it is separated between piezoelectric vibrator by partition, piezoelectric vibrator is the arcuate structure as made of substrate and piezoelectric piece bonding, and the bending radius of substrate is less than the bending radius of piezoelectric patches；Shell bottom wall is equipped with rectangular deep gouge, guide rod is installed thereon, successively be pressed with from bottom to top on guide rod reset spring, under short Stiff Block, lower flexible plectrum, lower long Stiff Block, in short Stiff Block, middle flexible plectrum, middle long Stiff Block, upper short Stiff Block, upper flexible plectrum, upper long Stiff Block and button, by the through-hole of upper cover, the big end upper surface of button acts against on lid the small end of button；Shell bottom wall connects on one's sick bed.
Description
Technical field
The invention belongs to medical electric product technical fields, and in particular to a kind of piezoelectric type hospital call signal generator.
Background technique
Calling set is divided into wireline call device and two kinds of wireless pager, most common in the bed caller that hospital ward uses
Be wireline call device it is time-consuming, laborious because the installation of wireline call device must be routed, recruiting unit must in fixed location,
Operating mode is not flexible, and maintenance, the disadvantages of maintenance cost is high, application is fewer and fewer.Current wireless pager, signal transmitting
Device relies on 12V battery to power mostly, and finite energy needs to be replaced frequently battery, wasting manpower and material resources, and if at old and useless battery
It is improper to manage, and easily causes serious environmental pollution.To replace traditional chemical battery, meets and be similar to wireless paging signals transmitter
Etc. micropowers, the confession electricity demanding of microminiature electronic product, domestic and foreign scholars propose in succession based on electrostatic, electromagnetism, thermoelectricity and
The microminiature energy capture device (also known as small generator or energy accumulator) of the principles such as piezoelectricity, wherein piezoelectric energy acquirer is with it
Structure is simple, without electromagnetic interference, energy density is big, is easily achieved microminiaturization and the advantages such as integrated and makes its scope of application more
Extensively.But since piezoelectric chip is fragile material, easily because of institute, tension stress is excessive and broken.Therefore, to make piezoelectric type power supply device
Practical application is obtained in wireless calling system, critical issue to be solved first is to improve the reliability of its work.
Summary of the invention
The present invention proposes a kind of piezoelectric type hospital call signal generator, and the embodiment that the present invention uses is: shell side
Wall end is provided with the upper cover of through-hole through screw, and upper Gai Shangjing washer and screw are equipped with circuit board, and circuit board is equipped with energy
Measure conversion circuit and signal transmitting system；Pedestal is installed through screw in housing sidewall, is equipped on pedestal through pressing plate and screw
One group of piezoelectric vibrator, piezoelectric vibrator one end are fixed, and are separated between each piezoelectric vibrator fixing end by partition, piezoelectric vibrator is by substrate
With arcuate structure made of piezoelectric piece bonding, the bending radius of substrate is less than the bending radius of piezoelectric patches, and piezoelectric patches is close to pedestal
The lower section that installation, i.e. piezoelectric patches are in substrate；Guide rod is installed, on guide rod from bottom to top in the rectangular deep gouge of shell bottom wall
Successively be pressed with reset spring, under short Stiff Block, lower flexible plectrum, lower long Stiff Block, in short Stiff Block, middle flexible plectrum, in
Long Stiff Block, upper short Stiff Block, upper flexible plectrum, upper long Stiff Block and button, the small end of button are stretched out by the through-hole of upper cover,
The big end upper surface of button acts against on the lower surface of upper cover, under short Stiff Block, lower flexible plectrum, lower long Stiff Block, in it is short just
Property block, middle flexible plectrum, middle long Stiff Block, upper short Stiff Block, upper flexible plectrum, upper long Stiff Block and button be connected to through screw
Together；Each piezoelectric vibrator is connected through different conducting wire groups with circuit board；Shell bottom wall connects on one's sick bed through screw.
Under off working state, reset spring is in compressive state, reset spring will under short Stiff Block, lower flexible plectrum, under
Long Stiff Block, in short Stiff Block, middle flexible plectrum, middle long Stiff Block, upper short Stiff Block, upper flexible plectrum, upper long Stiff Block and
Button is pressed on end cap, at this time piezoelectric vibrator not by external force, in the raw；When a button is depressed, lower flexible plectrum,
Middle flexibility plectrum, the substrate of upper flexible plectrum end and piezoelectric vibrator and long Stiff Block EDGE CONTACT thus bending stiffness it is larger,
It deforms small, stirs piezoelectric vibrator cantilever end and piezoelectric vibrator is forced to generate bending deformation, change simultaneously stress on piezoelectric patches point
Mechanical energy is converted to electric energy in the change procedure of piezoelectric patches upper stress distribution by cloth state；Continue push button, under
Flexible plectrum, middle flexible plectrum, upper flexible plectrum and piezoelectric vibrator disengage, and piezoelectric vibrator generates cyclic bending vibration, further
Convert mechanical energy into electric energy；When release button, that is, push-button reset, reset spring short Stiff Block, lower flexible plectrum, lower length by under
Stiff Block, in short Stiff Block, middle flexible plectrum, middle long Stiff Block, upper short Stiff Block, upper flexible plectrum, upper long Stiff Block and press
Button pushes back, under short Stiff Block, in short Stiff Block, the size of upper short Stiff Block it is smaller, it is lower flexibility plectrum, middle flexible plectrum, upper soft
Property plectrum end contact with piezoelectric patches and disengaged with long rigid block edge, therefore rigidity is small, deflection is big, easily de- with piezoelectric vibrator
Open, piezoelectric vibrator deform it is small or without deformation, do not generate big tensile stress.
In the present invention, each piezoelectric vibrator is connected through different conducting wire groups with circuit board, and piezoelectric vibrator is produced electricl energy through circuit
Signal transmitting system is used for after power conversion circuits processing on plate, signal transmitting system again to launch control signal；For
Meet the requirement of the low radio radiation of hospital, system is dry using Low emissivity, low-power, high wireless receiving sensitivity, zero electromagnetism
The FM wireless encoding technology disturbed.
In the present invention, to make piezoelectric vibrator that there is maximum generating capacity and avoiding piezoelectric patches because of tensile stress in manufacturing process
Excessive and damage, the radius minimum value on the convex surface of piezoelectric patches under natural conditions before piezoelectric vibrator assembly isWherein H is piezoelectric vibrator thickness, E1、E2Respectively base
The elasticity modulus of plate and piezoelectric patches,g31、T*The respectively dielectric constant of piezoelectric material, voltage constant and allowable tensile stress.
To enable lower flexible plectrum, middle flexible plectrum and upper flexible plectrum reaching perhaps in piezoelectric vibrator free end deflection
With disengaging before value, the extension l of lower flexibility plectrum, middle flexible plectrum and upper flexible plectrum should meetWherein:F=δ K, E are the Young's modulus of piezoelectric vibrator, EbFor under
The Young's modulus of flexible plectrum, middle flexible plectrum and upper flexible plectrum, I are the moment of inertia of piezoelectric vibrator, IbFor lower flexible plectrum,
The moment of inertia of middle flexibility plectrum, upper flexible plectrum, d are that the flexible plectrum in upper, middle and lower three contacts piezoelectricity under natural conditions
The length of overlapped part of oscillator, the length of overlapped part that described three flexible plectrums contact piezoelectric vibrator is equal, and δ, K points
Not Wei piezoelectric vibrator bending deformation quantity allowable value and bending stiffness；In the present invention, the allowable value of piezoelectric vibrator deflection isR is the radius on piezoelectric patches convex surface, and L is the length of piezoelectric vibrator deformable segment.
In the present invention, the deformation characteristic of piezoelectric vibrator is shaken by lower flexible plectrum, middle flexible plectrum, upper flexible plectrum and piezoelectricity
The rigidity of sub- contact portion determines, in the structure and scale of piezoelectric vibrator and lower flexible plectrum, middle flexible plectrum, upper flexible plectrum
When determining, can by lower long Stiff Block, middle long Stiff Block, upper long Stiff Block and under short Stiff Block, in short Stiff Block, upper short rigidity
The size of block is adjusted, and lower flexibility plectrum, middle flexible plectrum, upper flexible plectrum stir, realization hair different from rigidity when resetting
Piezoelectric patches will not generate big tensile stress, high reliablity while electric effect is preferable；Meanwhile being motivated in such a way that plectrum is stirred,
Piezoelectric vibrator works under first-order modal, and from convex to straight deformation, piezoelectric patches stress variation is uniform, and generating effect is good.
Advantage and characteristic: the mechanical energy power generation of people's push button is collected, additional supply, strong environmental adaptability are not necessarily to；
Piezoelectric vibrator can ensure that work under first-order modal, and piezoelectric patches stress variation is uniform, and generating effect is good, and system generating effect is easy
It is adjusted in by long Stiff Block and short rigid block size；It is stirred by lower flexible plectrum, middle flexible plectrum, upper flexible plectrum
It is different from rigidity when resetting, realize that piezoelectric vibrator is subjected only to lesser reversal deformation in work, piezoelectric patches receiving tensile stress is smaller,
Compression is born in its allowable value, therefore high reliablity.
Detailed description of the invention
Fig. 1 is the cross-sectional view of the structure of device in a preferred embodiment of the present invention；
Fig. 2 is the A-A cross-sectional view of Fig. 1；
Fig. 3 is the cross-sectional view of the structure of device when button is pressed；
Fig. 4 is the cross-sectional view of the structure of device when button unclamps.
Specific embodiment
The end housing sidewall r is provided with the upper cover a of through-hole through screw, is equipped with circuit through washer y and screw on upper cover a
Plate c, circuit board c are equipped with power conversion circuits and signal transmitting system；Pedestal s, pedestal are installed through screw on housing sidewall r
S is upper to be equipped with one group of piezoelectric vibrator b through pressing plate u and screw, and one end of piezoelectric vibrator b is fixed, the fixing end of each piezoelectric vibrator b it
Between separated by partition t, piezoelectric vibrator b is the arcuate structure as made of substrate b1 and piezoelectric patches b2 bonding, the bending of substrate b1 half
Diameter is less than the bending radius of piezoelectric patches b2, piezoelectric patches b2 piezoelectric patches b2 in pedestal s installation, main view i.e. shown in Fig. 1
Lower section in substrate b1；Guide rod x is installed in the rectangular deep gouge of shell bottom wall q, is successively pressed from bottom to top on guide rod x
Have reset spring m, under short Stiff Block p, lower flexible plectrum o, lower long Stiff Block n, in short Stiff Block k, middle flexible plectrum j, middle length
Stiff Block i, upper short Stiff Block h, upper flexible plectrum g, upper long Stiff Block f and button e, the small end e1 of button e pass through the logical of upper cover a
Hole is stretched out, and the upper surface big end e2 of button e acts against on the lower surface of upper cover a, under short Stiff Block p, lower flexible plectrum o, lower length
Stiff Block n, in short Stiff Block k, middle flexible plectrum j, middle long Stiff Block i, upper short Stiff Block h, upper flexible plectrum g, upper long rigidity
Block f and button e link together through screw；Each piezoelectric vibrator b is connected through different conducting wire groups with circuit board c；Shell bottom wall q
On one's sick bed through screw connection.
Under off working state, reset spring m is in compressive state, reset spring m short Stiff Block p, lower flexible plectrum by under
O, lower long Stiff Block n, in short Stiff Block k, middle flexible plectrum j, middle long Stiff Block i, upper short Stiff Block h, upper flexible plectrum g, on
Long Stiff Block f and button e are pressed on end cap a, at this time piezoelectric vibrator b not by external force, in the raw；When by lower button
When e, lower flexibility plectrum o, middle flexible plectrum j, the upper flexible end plectrum g and piezoelectric vibrator b contact portion rigidity are larger, stir pressure
Electric tachometer indicator b cantilever end makes piezoelectric vibrator b generate bending deformation, changes simultaneously the stress distribution on piezoelectric patches b2, piezoelectric patches
Mechanical energy is converted to electric energy in the change procedure of b2 upper stress distribution；Continuation push button e, lower flexibility plectrum o,
Middle flexibility plectrum j, upper flexibility plectrum g and piezoelectric vibrator b are disengaged, and piezoelectric vibrator b generates cyclic bending vibration, further will be mechanical
It can be converted into electric energy；Release button e, reset spring m will under short Stiff Block p, lower flexible plectrum o, lower long Stiff Block n, in it is short just
Property block k, middle flexible plectrum j, middle long Stiff Block i, upper short Stiff Block h, upper flexible plectrum g, upper long Stiff Block f and button e push back,
Under short Stiff Block p, in short Stiff Block k, the size of upper short Stiff Block h it is smaller, lower flexibility plectrum o, middle flexible plectrum j, upper flexibility
The end plectrum g and piezoelectric vibrator b contact portion rigidity are smaller, are easy to through piezoelectric vibrator b without making piezoelectric patches b2 generate big
Tensile stress.
In the present invention, each piezoelectric vibrator b is connected through different conducting wire groups with circuit board c, and piezoelectric vibrator b is produced electricl energy through electricity
Signal transmitting system is used for after power conversion circuits processing on the plate c of road, signal transmitting system again to launch control signal；
For meet hospital low radio radiation requirement, system use Low emissivity, low-power, high wireless receiving sensitivity, zero electromagnetism
The FM wireless encoding technology of interference.
In the present invention, to make piezoelectric vibrator b that there is maximum generating capacity and avoiding piezoelectric patches b2 because drawing in manufacturing process
Stress is excessive and damages, and the radius minimum value on the convex surface the b2 of piezoelectric patches under natural conditions before piezoelectric vibrator b assembly isWherein H is the thickness of piezoelectric vibrator b, E1、E2Respectively
The elasticity modulus of substrate b1 and piezoelectric patches b2,g31、T*The respectively dielectric constant of piezoelectric material, voltage constant and drawing allowable
Stress.
To enable lower flexible plectrum o, middle flexibility plectrum j and upper flexibility plectrum g reaching in piezoelectric vibrator b free end deflection
It is disengaged before to allowable value, the extension l of lower flexibility plectrum o, middle flexibility plectrum j and upper flexible plectrum g should meetWherein:F=δ K, E are the Young's modulus of piezoelectric vibrator b, EbFor
The Young's modulus of lower flexibility plectrum o, middle flexibility plectrum j and upper flexible plectrum g, I is the moment of inertia of piezoelectric vibrator b, IbIt is soft under
Property plectrum o, middle flexible plectrum j, upper flexible plectrum g the moment of inertia, d is lower flexible plectrum o, middle flexible plectrum j under natural conditions
And upper flexibility plectrum g contacts the length of overlapped part of piezoelectric vibrator b, described three flexible plectrums are in contact with it piezoelectricity vibration
The length of overlapped part of sub- b is equal, and δ, K are respectively the allowable value and bending stiffness of the bending deformation quantity of piezoelectric vibrator b；The present invention
In, the allowable value of piezoelectric vibrator b deflection isR is the radius on the convex surface piezoelectric patches b2, and L is piezoelectricity
The length of oscillator b deformable segment.
In the present invention, the deformation characteristic of piezoelectric vibrator b is by lower flexible plectrum o, middle flexible plectrum j, upper flexibility plectrum g and pressure
The rigidity of electric tachometer indicator b contact portion determines, in piezoelectric vibrator b and lower flexible plectrum o, middle flexible plectrum j, upper flexible plectrum g
When structure and scale determine, can by lower long Stiff Block n, middle long Stiff Block i, upper long Stiff Block f and under short Stiff Block p, in it is short
Stiff Block k, upper short Stiff Block h size adjusted, lower flexibility plectrum o, middle flexible plectrum j, upper flexibility plectrum g are stirred and are answered
Rigidity is different when position, realizes that piezoelectric patches b2 will not generate big tensile stress, high reliablity while generating effect is preferable；Meanwhile
It is motivated in such a way that plectrum is stirred, piezoelectric vibrator b works under first-order modal, and from convex to straight deformation, piezoelectric patches b2 is answered
Uniformly, generating effect is good for power variation.
Claims (1)
1. a kind of piezoelectric type hospital call signal generator, it is characterised in that: housing sidewall end is equipped with the upper cover with through-hole, on
It covers equipped with circuit board, circuit board is equipped with power conversion circuits and signal transmitting system；Pedestal, pedestal are housed in housing sidewall
There are three piezoelectric vibrators for upper dress, and piezoelectric vibrator one end is fixed, separated between each piezoelectric vibrator fixing end by partition, piezoelectric vibrator is
The arcuate structure as made of substrate and piezoelectric piece bonding, the bending radius of substrate are less than the bending radius of piezoelectric patches, piezoelectric patches court
To the side of pedestal；Guide rod is housed in the rectangular deep gouge of shell bottom wall, is successively pressed with reset bullet from bottom to top on guide rod
Spring, under short Stiff Block, lower flexible plectrum, lower long Stiff Block, in short Stiff Block, middle flexible plectrum, middle long Stiff Block, upper short rigidity
Block, upper flexible plectrum, upper long Stiff Block and button, the small end of button are stretched out by the through-hole of upper cover, the big end upper surface of button
Act against on the lower surface of upper cover, under short Stiff Block, lower flexible plectrum, lower long Stiff Block, in short Stiff Block, middle flexible plectrum,
Middle long Stiff Block, upper short Stiff Block, upper flexible plectrum, upper long Stiff Block and button link together through screw；When by lower button,
The substrate and long Stiff Block EDGE CONTACT of upper, middle and lower flexibility plectrum and piezoelectric vibrator, the bending stiffness of upper, middle and lower flexibility plectrum
It is bigger than the bending stiffness of piezoelectric vibrator, make piezoelectric vibrator generate bending deformation and before piezoelectric vibrator deflection reaches allowable value with
Piezoelectric vibrator disengages；When push-button reset, upper, middle and lower flexibility plectrum end contacts with piezoelectric patches and disengages with long rigid block edge,
The bending stiffness of upper, middle and lower flexibility plectrum is smaller than the bending stiffness of piezoelectric vibrator, the deflection of upper, middle and lower flexibility plectrum is big,
Easily with piezoelectric vibrator disengage, piezoelectric vibrator deform it is small or without deformation, do not generate big tensile stress；Piezoelectric vibrator is produced electricl energy through electricity
Power conversion circuits treatment and supplied signal transmitting system on the plate of road, signal transmitting system again launch control signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710729377.4A CN107332469B (en) | 2017-08-17 | 2017-08-17 | A kind of piezoelectric type hospital call signal generator |
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| CN201710729377.4A CN107332469B (en) | 2017-08-17 | 2017-08-17 | A kind of piezoelectric type hospital call signal generator |
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| CN107332469B true CN107332469B (en) | 2019-03-05 |
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| CN110752777B (en) * | 2019-05-18 | 2021-10-19 | 浙江师范大学 | Blunt body vortex vibration-induced generator |
| CN110798097B (en) * | 2019-05-18 | 2021-10-08 | 浙江师范大学 | Multipurpose piezoelectric vibration generator |
| CN110912450B (en) * | 2019-05-18 | 2021-10-01 | 浙江师范大学 | Amplitude limiting excitation type low-frequency piezoelectric generator |
| CN111711382B (en) * | 2020-05-29 | 2021-09-28 | 上海应用技术大学 | Rotary energy collector based on PZT cantilever beam |
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