CN110206717B

CN110206717B - Bidirectional piezoelectric pump

Info

Publication number: CN110206717B
Application number: CN201910400305.4A
Authority: CN
Inventors: 张建辉; 包启波; 赖立怡; 唐茗; 杨冠宇; 潘殷豪; 黄智�
Original assignee: Guangzhou University
Current assignee: Guangzhou University
Priority date: 2019-05-14
Filing date: 2019-05-14
Publication date: 2020-09-11
Anticipated expiration: 2039-05-14
Also published as: CN110206717A

Abstract

The invention discloses a bidirectional piezoelectric pump, which comprises a pump body, an electric control system and an adjusting mechanism, the first flexible turbulence component, the second flexible turbulence component and the piezoelectric vibrator that is used for changing the volume of the pump body, the pump body is equipped with pump chamber and first runner and the second runner of intercommunication pump chamber and external world, the top of the pump body is equipped with the counter bore, the bottom and the pump chamber intercommunication of counter bore, piezoelectric vibrator connects in the bottom of counter bore, electrical system's output is connected with the piezoelectric vibrator electricity, first flexible turbulence component has two first flexible turbulence spare, the first tip of each first flexible turbulence spare all with the inner wall fixed connection of first runner, the second flexible turbulence component has two second flexible turbulence spare, the second tip of each second flexible turbulence spare all with the inner wall fixed connection of second runner, adjustment mechanism's output is connected with each first flexible turbulence spare and each second turbulence spare respectively. The bidirectional piezoelectric pump provided by the invention has a simple structure, can realize bidirectional pumping, and can adjust the pumping flow.

Description

Bidirectional piezoelectric pump

Technical Field

The invention relates to the technical field of fluid machinery, in particular to a bidirectional piezoelectric pump.

Background

The piezoelectric pump is a novel fluid driver, and does not need an additional driving motor, but utilizes the inverse piezoelectric effect of the piezoelectric ceramic material to deform the piezoelectric vibrator, so that the volume of a pump cavity is changed, and fluid output is realized, or the fluctuation of the piezoelectric vibrator is utilized to transmit liquid. Compared with other traditional pump bodies, the piezoelectric pump has the characteristics of simple structure, small volume, low energy consumption, no electromagnetic interference and the like.

Piezoelectric pumps can be divided into valved piezoelectric pumps and valveless piezoelectric pumps. The pump flow of the piezoelectric pump with the valve is larger, the output pressure is large, the structure is very complex, and the valve plate is easy to fatigue and damage. The valveless piezoelectric pump utilizes the difference of the flow resistance coefficients of the fluid in different pumping directions to enable the fluid to form macroscopically unidirectional flow when the volume of the pump cavity is changed. The valveless piezoelectric pump has a simple structure, is beneficial to miniaturization design, but has small pumping flow and large flow pulsation, and can only convey fluid in one direction.

Disclosure of Invention

The invention aims to provide a bidirectional piezoelectric pump which is simple in structure, can realize bidirectional pumping and can adjust the pumping flow.

In order to achieve the above object, an embodiment of the present invention provides a bidirectional piezoelectric pump, which includes a pump body, an electronic control system, an adjusting mechanism, a first flexible spoiler assembly, a second flexible spoiler assembly, and a piezoelectric vibrator for changing a volume of the pump body.

The pump body is equipped with the pump chamber and communicates pump chamber and external first runner and second runner, the top of the pump body is equipped with the counter bore, the bottom of counter bore with the pump chamber intercommunication, the piezoelectric vibrator connect in the bottom of counter bore, electrical system's output with the piezoelectric vibrator electricity is connected.

The first flexible turbulence component is provided with two first flexible turbulence parts symmetrically arranged along the central line of the first flow channel, each first flexible turbulence part comprises a first end part close to the pump cavity and a second end part far away from the pump cavity, and the first end part of each first flexible turbulence part is fixedly connected with the inner wall of the first flow channel.

The second flexible turbulence component is provided with two second flexible turbulence parts symmetrically arranged along the central line of the second flow channel, each second flexible turbulence part comprises a first end part close to the pump cavity and a second end part far away from the pump cavity, and the second end parts of the second flexible turbulence parts are fixedly connected with the inner wall of the second flow channel.

The output end of the adjusting mechanism is connected with each first flexible turbulence member and each second flexible turbulence member respectively so as to adjust the distance between the second end parts of the two first flexible turbulence members and the distance between the first end parts of the two second flexible turbulence members.

As a preferred scheme, first groove bodies are symmetrically arranged on the inner walls of the two sides of the first flow channel, and the first end part of the first flexible turbulence piece is connected to the first groove bodies so as to be connected with the inner walls of the first flow channel.

The second groove bodies are symmetrically arranged on the inner walls of the two sides of the second flow channel, and the second end of the second flexible flow disturbing piece is connected into the second groove bodies so as to be connected with the inner walls of the second flow channel.

Preferably, the material of the first flexible spoiler and the material of the second flexible spoiler are brass, stainless steel or plastic.

Preferably, the adjusting mechanism includes a first control device, two first driving devices, two second driving devices, two first transmission devices, two second transmission devices, two first cam devices symmetrically arranged, and two second cam devices symmetrically arranged.

The output end of the first control device is electrically connected with the input end of each first driving device and the input end of each second driving device respectively, the output end of the first driving device is connected with the input end of the first transmission device, the output end of the second driving device is connected with the input end of the second transmission device, the output end of the first transmission device penetrates through the pump body and is connected with the first cam device, the output end of the second transmission device penetrates through the pump body and is connected with the second cam device, the first cam device is abutted to one side, close to the inner wall of the first flow channel, of the inner wall of the first flow channel and the first flexible turbulence member respectively, and the second cam device is abutted to one side, close to the inner wall of the second flow channel, of the inner wall of the second flow channel and the second flexible turbulence member respectively.

In a working state, the first control device controls each first driving device to drive each first transmission device to rotate so as to drive each first cam device to rotate, so that each first flexible turbulence member swings to change the distance between the second end parts of the two first flexible turbulence members; the first control device controls the second driving devices to drive the second transmission devices to rotate, and drives the second cam devices to rotate, so that the second flexible spoiler pieces swing to change the distance between the first end portions of the two second flexible spoiler pieces.

Preferably, the elastic modulus of the first flow channel and the elastic modulus of the second flow channel are both 2MPa to 7 MPa.

Preferably, the adjusting mechanism includes a second control device, two third driving devices, two fourth driving devices, two third transmission devices, two fourth transmission devices, two third cam devices symmetrically distributed on two sides of the first flow channel, and two fourth cam devices symmetrically distributed on two sides of the second flow channel.

The output end of the second control device is respectively electrically connected with the input end of each third driving device and the input end of each fourth driving device, the output end of the third driving device is connected with the input end of the third transmission device, the output end of the fourth driving device is connected with the input end of the fourth transmission device, the output end of the third transmission device penetrates through the pump body and is connected with the third cam device, the output end of the fourth transmission device penetrates through the pump body and is connected with the fourth cam device, the third cam device is abutted against the outer wall of the first flow channel, and the fourth cam device is abutted against the outer wall of the second flow channel.

In a working state, the second control device controls each third driving device to drive each third transmission device to rotate, so as to drive each third cam device to rotate and extrude the side wall of the first flow channel, and thus the distance between the second end parts of the two first flexible turbulence members is changed; the second control device controls the fourth driving devices to drive the fourth transmission devices to rotate, drives the fourth cam devices to rotate and extrude the side wall of the second flow channel, and accordingly the distance between the first end portions of the two second flexible turbulence pieces is changed.

Preferably, the adjusting mechanism includes a third control device, a fifth driving device, a sixth driving device, a fifth transmission device, a sixth transmission device, two first magnets located on two sides of the pump body, two second magnets located on two sides of the pump body, and two third magnets and two fourth magnets located in the pump body, which are located outside the pump body.

The output end of the third control device is respectively electrically connected with the input end of the fifth driving device and the input end of the sixth driving device, the output end of the fifth driving device is connected with the input end of the fifth transmission device, the output end of the sixth driving device is connected with the input end of the sixth transmission device, the output end of the fifth transmission device is respectively connected with the first magnets, the output end of the sixth transmission device is respectively connected with the second magnets, the third magnets are fixedly connected to one side, close to the inner wall of the first flow channel, of the first flexible turbulence member, and the fourth magnets are fixedly connected to one side, close to the inner wall of the second flow channel, of the second flexible turbulence member.

In a working state, the third control device synchronously controls the fifth driving device to drive the fifth transmission device to rotate, so that each first magnet is close to or far away from each third magnet, and the distance between the second end parts of the two first flexible spoiler pieces is changed; the third control device controls the sixth driving device to drive the sixth transmission device to rotate, so that each fourth magnet is close to or far away from each fourth magnet, and the distance between the first end parts of the two second flexible spoiler pieces is changed.

Preferably, the polarities of the surfaces of the two third magnets which face each other are the same, and the polarities of the surfaces of the two fourth magnets which face each other are the same.

As a preferred scheme, first flexible spoiler with second flexible spoiler all includes base plate layer, piezoceramics layer, silver foil layer and insulating parcel layer, piezoceramics layer one side is connected on the base plate layer, piezoceramics layer's opposite side is connected on the silver foil layer, the base plate layer piezoceramics layer with silver foil layer all is wrapped up in the insulating parcel in situ.

Preferably, the adjusting mechanism includes two first electric controllers and two second electric controllers, each of the first electric controllers is electrically connected to each of the first flexible spoiler, and each of the second electric controllers is electrically connected to each of the second flexible spoiler.

In summary, the bidirectional piezoelectric pump provided by the invention has a simple structure, and comprises a pump body, a piezoelectric vibrator, an electric control system, two sets of flexible spoilers and an adjusting mechanism, wherein the two sets of flexible spoilers are oppositely arranged. According to the prior art theory, the conveying direction of the fluid is related to the frequency and the voltage of the electric signal applied to the piezoelectric vibrator and the distance between the free ends of the two oppositely arranged flexible spoilers, and the pumping amount is related to the frequency and the voltage of the electric signal applied to the piezoelectric vibrator. The user can adjust the free end distance of two relative flexible vortex spare that set up and electrical system's output voltage and frequency through adjustment mechanism, realizes the positive reverse transport of the pump body. Under the condition of forward conveying fluid, the distance between the free ends of the flexible turbulence assemblies is adjusted to be smaller through the adjusting mechanism, so that the forward conveying flow of the pump body is increased. Therefore, the frequency, the voltage and the space between the free ends of the flexible turbulence components are adjusted, so that the bidirectional piezoelectric pump provided by the invention can realize bidirectional pumping, and the requirement of maximum forward conveying flow can be met.

Drawings

FIG. 1 is a top view of a bi-directional piezoelectric pump provided by the present invention;

FIG. 2 is a schematic diagram of the internal structure of the bi-directional piezoelectric pump provided by the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

fig. 4 is a schematic connection diagram of the first flow channel, the second flow channel, the first flexible spoiler assembly, the second flexible spoiler assembly and the adjusting mechanism according to the first embodiment of the present invention;

FIG. 5 is an enlarged view at B in FIG. 4;

FIG. 6 is a schematic diagram of a connection between a first driving device and a first transmission device according to an embodiment of the present invention;

fig. 7 is a schematic connection diagram of the first flow channel, the second flow channel, the first flexible spoiler assembly, the second flexible spoiler assembly, and the adjusting mechanism according to the second embodiment of the present invention;

fig. 8 is a schematic connection diagram of the first flow channel, the second flow channel, the first flexible spoiler assembly, the second flexible spoiler assembly and the adjusting mechanism according to the third embodiment of the present invention;

FIG. 9 is a schematic view of the fifth transmission, pump body and fifth drive arrangement in accordance with a third embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a first flexible spoiler provided in accordance with a fourth embodiment of the present invention;

fig. 11 is a schematic connection diagram of the first flow channel, the second flow channel, the first flexible spoiler assembly, the second flexible spoiler assembly, and the adjusting mechanism according to the fourth embodiment of the present invention.

Reference numerals:

1. a piezoelectric vibrator, 2, a first flexible spoiler, 21, a substrate layer, 22, a piezoelectric ceramic layer, 23, a silver foil layer, 24, an insulating wrapping layer, 3, a second flexible spoiler, 4, a pump body, 41, a pump cover, 42, a pump base, 5, a pump cavity, 6, a first flow channel, 7, a second flow channel, 8, a counter bore, 9, an adjusting mechanism, 901, a first driving device, 902, a first transmission device, 9021, a rotating shaft, 9022, a gear set, 903, a first cam device, 904, a second cam device, 905, a third transmission device, 906, a fourth transmission device, 907, a third cam device, 908, a fourth cam device, 909, a fifth transmission device, 9091, a first rotating member, 9092, a second rotating member, 9093, a first moving member, 9094, a second moving member, 9095, a guide rod, 9096, a connecting member, 910, a fifth driving device, 911, a first magnet, 912, a second magnet, 913. a third magnet 914, a fourth magnet 915, a first electric controller 916, a second electric controller 10, a first trough body 11 and a second trough body.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Example one

As shown in fig. 1 to 6, the present invention provides a bidirectional piezoelectric pump, which includes a pump body 4, an electric control system, an adjusting mechanism 9, a first flexible turbulence component, a second flexible turbulence component, and a piezoelectric vibrator 1 for changing the volume of the pump body 4, wherein the pump body 4 is provided with a pump cavity 5, a first flow channel 6 and a second flow channel 7 for communicating the pump cavity 5 with the outside, the top of the pump body 4 is provided with a counter bore 8, the bottom of the counter bore 8 is communicated with the pump cavity 5, the piezoelectric vibrator 1 is connected to the bottom of the counter bore 8, the output end of the electric control system is electrically connected to the piezoelectric vibrator 1, the first flexible turbulence component is provided with two first flexible turbulence components 2 symmetrically arranged along the center line of the first flow channel 6, each first flexible turbulence component 2 includes a first end portion close to the pump cavity 5 and a second end portion far away from the pump cavity 5, the first end portion of each first flexible turbulence component 2 is fixedly connected to, the second flexible spoiler assembly has two second flexible spoiler 3 that set up along the central line symmetry of second runner 7, second flexible spoiler 3 is including the first end portion that is close to pump chamber 5 and the second end portion of keeping away from pump chamber 5, the second end portion of each second flexible spoiler 3 all with the inner wall fixed connection of second runner 7, the output of adjustment mechanism 9 is connected with each first flexible spoiler 2 and each second flexible spoiler 3 respectively, with the distance between the second end portion of adjusting two first flexible spoiler 2 and the distance between the first end portion of two second flexible spoiler 3.

Based on the above technical scheme, record as the stiff end of first flexible vortex piece 2 with the one end of first flexible vortex piece 2 fixed connection on first runner 6, the other end of flexible vortex piece is the free end of first flexible vortex piece 2. Similarly, the end of the second flexible spoiler 3 connected to the second flow channel 7 is denoted as a fixed end, and the other end of the second flexible spoiler 3 is a free end. The port of the pump body 4 close to the first flexible turbulence assembly is marked as a first opening, and the other port of the pump body 4 is marked as a second opening. The fluid flow in from the second opening and out from the first opening is defined as forward transport, and the fluid flow in from the first opening and out from the second opening is defined as reverse transport.

In this embodiment, the shape of first flexible spoiler 2 and the flexible spoiler 3 of second is the arc slice, and first flexible spoiler 2 and the flexible spoiler 3 of second are gentle and agreeable structure, and it has fine resilience, can freely swing. One end of the first flexible turbulence member 2 and one end of the second flexible turbulence member 3 are fixed in the pump body 4, so that the two first flexible turbulence members 2 are splayed and symmetrically distributed along the axis of the first flow channel 6, and the two second flexible turbulence members 3 are splayed and symmetrically distributed along the axis of the second flow channel 7. In this embodiment, the shape of the first flow channel 6 and the shape of the second flow channel 7 are both straight long strips, the first flow channel 6 and the second flow channel 7 are symmetrically arranged along the center line of the pump cavity 5, and the orientation of the first flexible spoiler assembly is the same as the orientation of the second flexible spoiler assembly. The electric control system can be a power box for a laboratory or other power supply devices which can provide alternating current and can adjust voltage and frequency. The piezoelectric vibrator 1 is tightly attached to the bottom of the counter bore 8, the piezoelectric vibrator 1 comprises a metal sheet and a piezoelectric ceramic sheet adhered to the metal sheet, and specifically, the metal sheet is a brass sheet. The pump body 4 includes a pump cover 41 and a pump base 42 hermetically connected to the pump cover 41, the counterbore 8 is located at the center of the pump cover 41, and the pump chamber 5 is located right below the counterbore.

The principle of the bidirectional piezoelectric pump for realizing the pumping function is similar to the working principle of the conventional piezoelectric conical flow tube valveless pump, and the principle is as follows: the electric control system provides alternating current with periodic change, the electric control system is electrically connected with the piezoelectric vibrator 1, and when the electric control system applies voltage to two ends of the piezoelectric vibrator 1, the piezoelectric vibrator 1 generates bending deformation in the pump cavity 5 under the effect of inverse piezoelectric effect. When the piezoelectric vibrator 1 protrudes upward, the volume of the pump chamber 5 becomes large and the pressure in the chamber decreases. Because first flexible vortex subassembly and the flexible vortex subassembly of second all are eight characters type distributions, under the change of intracavity pressure, the free end of two first flexible vortex spare 2 is close to each other, and first flexible vortex subassembly is and is close closed or closed state, and the free end of two flexible vortex spare 3 is kept away from each other, and the flexible vortex subassembly of second is the expansion state, and the fluid is inhaled in pump chamber 5. It is considered that, in the bidirectional piezoelectric pump of the present invention, when the fluid is sucked into the pump chamber 5, the flow rate sucked from the second opening is larger than the flow rate sucked from the first opening. On the contrary, when the piezoelectric vibrator 1 sinks downwards, the volume of pump chamber 5 diminishes, and intracavity pressure increases, and the free end of two first flexible vortex pieces 2 is kept away from each other, and first flexible vortex subassembly is the expansion state, and the free end of two flexible vortex pieces 3 is close to each other, and the flexible vortex subassembly of second is and is close closure or closed state, and the fluid is discharged from pump chamber 5. When discharging the fluid, the discharge amount of the first opening may be larger than the discharge amount of the second opening. That is, the electronic control system applies an alternating current excitation signal to the piezoelectric vibrator 1, so that the pump cavity 5 generates periodic volume change, and the pump body 4 can continuously transport the fluid from the second flow passage 7 to the first flow passage 6 macroscopically, namely, the function of forward pumping of the fluid is realized.

The principle of the bidirectional Piezoelectric Pump provided by the invention for realizing the bidirectional pumping function can be seen in advanced in valve Piezoelectric Pump with connected Tubes (research progress of a conical tube Valveless Piezoelectric Pump) published in 2017, 30 th volume 04 (pages 766 to 781) of Chinese Journal of mechanical Engineering (Chinese mechanical Engineering). This document discusses that the direction of flow of the fluid is related to the size of the cone angle of the conical tube. In connection with this conclusion, relevant statements in this document are, but not limited to:

1. "the magnitude of the signal of the;

2、“Comparison results confirm the conclusion of Ref.[37],i.e., whenthe cone angleis small,the flow direction is clockwise；On the other hand,theflow direction is coun

terclockwise,although no plane structure of valvelesspiezoelectric pumps with cone-shaped tubes had been proposed before the Ref.[37]ws writen. "(comparative results confirm reference [37 ]]The conclusion is that when the cone angle is small, the flow direction is clockwise; on the other hand, the flow direction is counter-clockwise, although in reference [37 ]]No flat structure of valveless piezoelectric pump with conical tube has been proposed before writing);

3. "The historical theory emphasizes that for valveless piezoelectric pumps with tapered tubes, flow resistance is determined, and taper angle resistance determines flow direction".

In the invention, the first flexible turbulence component and the second flexible turbulence component are distributed in a splayed shape and can be seen as a conical structure, which is equivalent to a diffuser and a nozzle in the literature. The included angle between the free ends of the flexible turbulence members is recorded as theta, when the distance between the free ends of the two opposite flexible turbulence members is increased, the smaller the theta value is, the expansion of the flexible turbulence member can be recorded, and otherwise, the contraction of the flexible turbulence member can be recorded. Under the condition that the electric control system outputs low-frequency and low-voltage electric signals, the deformation of the flexible turbulence component is less under the action of the piezoelectric vibrator 1, but the volume in the cavity is still changed to form pressure difference, and the fluid flow is not obvious. The change of the conicity of the diffuser and the nozzle can change the size of the flow resistance coefficient, and the change of the flow resistance coefficient can weaken the forward flow of the fluid and even enable the fluid to flow reversely, so that the change of the distance between the free ends of the two opposite flexible flow disturbing pieces can realize the reverse conveying from the macroscopic view under the low-frequency and low-pressure conditions. Under the condition that the electric control system outputs a high-frequency high-voltage electric signal, the volume in the cavity changes rapidly, at the moment, the two flexible turbulence assemblies are equivalent to the functions of a valve, the deformation of the flexible turbulence assemblies caused by the influence of the piezoelectric vibrator 1 is obvious, the expansion and contraction actions of the flexible turbulence assemblies are obvious, and the fluid flows in the positive direction. Explained from the aspect of Reynolds number effect, under the condition that the distance between the free ends of the two groups of flexible spoilers is a certain distance, namely when the value theta is within a certain range, the Reynolds number of the fluid in forward pulsation is lower than the Reynolds number of the fluid in reverse pulsation under low frequency and low pressure, so that the reverse pulsation is compared with the forward pulsation to generate net flow velocity, and therefore, reverse net flow is generated. Therefore, the piezoelectric pump can realize forward conveying of the fluid under the high-frequency high pressure condition, and can realize reverse conveying of the fluid under the low-frequency low-pressure condition. By combining the existing research on the valveless piezoelectric pump, a user can adjust the distance between the free ends of the two groups of flexible turbulence assemblies by adjusting the output frequency and voltage of the electric control system, so that the bidirectional piezoelectric pump can realize the functions of forward conveying and reverse conveying.

The relevant size design of the bidirectional piezoelectric pump provided by the embodiment of the invention is as follows: the pump chamber 5 has a circular cross-sectional shape with an inner diameter of 12mm and a height of 1.1 mm. The first flow channel 6 and the second flow channel 7 are both 1.5mm in height and 2mm in width. The length of first flexible spoiler 2 and second flexible spoiler 3 after fully extending is 5mm, and the width is 1.3mm, and thickness is 0.05 mm. The maximum diameter of the piezoelectric ceramic plate is 15 mm.

In the embodiment of the present invention, when the distance between the free ends of the two first flexible spoilers 2 and the distance between the free ends of the two second flexible spoilers 3 are both greater than 0.2mm, and θ is greater than or equal to 8 °, the pump body 4 can achieve forward fluid delivery under the conditions of high frequency and high voltage (i.e., voltage is greater than 180Vpp and frequency is greater than 120Hz), and can achieve reverse fluid delivery under the conditions of low frequency and low voltage (voltage is less than 120Vpp and frequency is less than 80 Hz). For example, under the above conditions, when the distance between the free ends of the flexible spoiler of any one of the flexible spoiler assemblies is greater than or equal to 0.5mm, the electronic control system is adjusted to output an alternating current with a voltage lower than 120Vpp and a frequency lower than 80Hz, and at this time, the piezoelectric vibrator 1 is in a low-frequency and low-pressure state, and the pump body 4 reversely conveys the fluid. When the voltage is higher than 180Vpp and the frequency is higher than the alternating current of 120Hz, the piezoelectric vibrator 1 is in a high-frequency and high-voltage state, and the pump body 4 forwards conveys the fluid. When the distance between the free ends of the flexible flow disturbing pieces of any one flexible flow disturbing assembly is equal to 0.2mm, the pumping direction of the bidirectional piezoelectric pump is in the positive direction. The deformation amplitude of the piezoelectric vibrator 1 is in a linear positive correlation with the voltage value and in a nonlinear negative correlation with the frequency. Under the same voltage, the maximum pumping capacity of the bidirectional piezoelectric pump is concentrated when the frequency output by the electronic control system is 90 Hz. When the frequency is 90Hz, the pumping amount increases with the increase in voltage, and the upper limit of the pumping amount depends on the rated voltage of the piezoelectric vibrator 1. When the free end of any flexible turbulence component is in critical contact and the taper angle theta is smaller than or equal to 29 degrees, the pump body 4 forwards conveys fluid. When the distance between the free ends of the flexible turbulence members of any flexible turbulence assembly is equal to 0mm, the pump body 4 positively conveys fluid under the same voltage. When the frequency output by the electric control system is 80Hz, the pumping flow is maximum. Similarly, in this case, the upper limit of the pumping flow rate depends on the rated voltage of the piezoelectric vibrator 1, and the deformation amplitude of the piezoelectric vibrator 1 has a linear positive correlation with the voltage value and a nonlinear negative correlation with the frequency. In summary, only when the distance between the free ends of the two first flexible spoiler 2 and the distance between the free ends of the two second flexible spoiler 3 are both greater than 0.2mm and θ is greater than or equal to 8 °, the pump body 4 can realize bidirectional forward and backward conveying by adjusting the output frequency and voltage of the electric control system. In other cases, the pump body 4 can only perform the forward feeding function.

According to the theory of the unsteady characteristic research of the planar taper tube for the valveless piezoelectric pump, published in 48 th 5 th volume of the journal of the university of western's transportation, in the case of forward fluid delivery, the smaller the distance between the free ends of the two opposing flexible spoilers, the larger the delivery flow rate. Therefore, the distance between the free ends of the flexible turbulence components can be controlled to be reduced by adjusting the adjusting mechanism 9, and the bidirectional piezoelectric pump can realize forward conveying of different flows.

When the bidirectional piezoelectric pump provided by the embodiment of the invention is used, a user can adjust the distance between the two free ends of the first flexible turbulence component to be larger than 0.2mm and the distance between the two free ends of the second flexible turbulence component to be larger than 0.2mm through the adjusting mechanism 9, and the positive and negative bidirectional conveying of the pump body 4 is realized by adjusting the output voltage and the frequency of the electric control system. The output voltage and frequency of the electric control system are changed by adjusting the distance between the free ends of the first flexible turbulence assembly and the distance between the free ends of the second flexible turbulence assembly, so that the pumping capacity of the bidirectional piezoelectric pump is at the maximum. Therefore, the bidirectional piezoelectric pump provided by the invention can realize bidirectional pumping, can freely adjust the pumping flow according to actual needs, and is convenient to use and simple in structure.

Specifically, the first groove 10 is symmetrically arranged on the inner walls of the two sides of the first flow channel 6, the first end portion of the first flexible spoiler 2 is connected to the first groove 10 to be connected with the inner wall of the first flow channel 6, the second groove 11 is symmetrically arranged on the inner walls of the two sides of the second flow channel 7, and the second end portion of the second flexible spoiler 3 is connected to the second groove 11 to be connected with the inner wall of the second flow channel 7. In this embodiment, the first tank 10 and the second tank 11 are both in a shape of "7", and the first flexible spoiler 2 and the second flexible spoiler 3 are both connected inside the first tank 10 and the second tank 11 by glue. The groove body is arranged on the inner wall of the flow channel, so that the position of the flexible turbulence piece is convenient to fix, and the flexible turbulence piece is prevented from being washed away due to overlarge fluid flow.

In particular, the first flexible spoiler 2 and the second flexible spoiler 3 have the characteristic of flexibility and have good resilience, and the material of the first flexible spoiler 2 and the material of the second flexible spoiler 3 are all brass, stainless steel or plastic. Preferably, the material of the first flexible spoiler 2 and the material of the second flexible spoiler 3 are both brass.

Wherein, the adjusting mechanism 9 comprises a first control device, two first driving devices 901, two second driving devices, two first driving devices 902, two second driving devices, two first cam devices 903 arranged symmetrically and two second cam devices 904 arranged symmetrically, the output end of the first control device is electrically connected with the input end of each first driving device 901 and the input end of each second driving device respectively, the output end of the first driving device 901 is connected with the input end of the first driving device 902, the output end of the second driving device is connected with the input end of the second driving device, the output end of the first driving device 902 passes through the pump body 4 to be connected with the first cam device 903, the output end of the second driving device passes through the pump body 4 to be connected with the second cam device 904, the first cam device 903 is respectively connected with the inner wall of the first flow channel 6 and one side of the first flexible spoiler 2 close to the inner wall of the first flow channel 6 in an abutting joint manner, the second cam device 904 is respectively abutted against the inner wall of the second flow channel 7 and one side of the second flexible spoiler 3 close to the inner wall of the second flow channel 7, and in a working state, the first control device controls each first driving device 901 to drive each first driving device 902 to rotate, so as to drive each first cam device 903 to rotate, so that each first flexible spoiler 2 swings, and the distance between the second end parts of the two first flexible spoilers 2 is changed; the first control device controls each second driving device to drive each second transmission device to rotate, and drives each second cam device 904 to rotate, so that each second flexible spoiler 3 swings to change the distance between the first ends of the two second flexible spoilers 3.

The first cam means 903 and the second cam means 904 are both located in the acute angle region formed by the flexible spoiler and the flow channel, and the free end distance of two opposite flexible spoilers is changed by the mechanical contact of the cam means and the flexible spoilers. In this embodiment, the first control device may be a PLC control system, and the first driving device 901 and the second driving device may be driving motors. The first flow channel 6 and the second flow channel 7 are both made of a hard material. The first cam device 903 and the second cam device 904 each comprise at least one cam. The cam is positioned between the flexible turbulence member and the inner wall of the flow channel, and the flexible turbulence member can be squeezed during rotation, so that the flexible turbulence member swings in the flow channel. The first transmission device 902 and the second transmission device both include a rotating shaft 9021 and a gear set 9022, an output end of the driving motor is connected with an input end of the gear set 9022, and an output end of the gear set 9022 is connected with an input end of the rotating shaft 9021. The pump body 4 is provided with a first sealing hole, and the output end of the rotating shaft 9021 penetrates through the pump body 4 through the first sealing hole to be connected with the cam. The adjusting mechanism 9 has simple structure and convenient operation. When the flexible spoiler 2 is used, a user can synchronously control the two first driving devices 901 to operate through the first control device, so that the two first driving devices 902 run synchronously, the two first cam devices 903 rotate synchronously and reversely, the two first flexible spoiler 2 swing, and the free ends of the two first flexible spoiler 2 are close to or far away from each other. Similarly, the first control device synchronously controls the two second driving devices to operate, so that the effect of adjusting the distance between the two free ends in the second flexible turbulence assembly is achieved.

In this embodiment, when the bidirectional piezoelectric pump is required to reversely convey fluid, the first control device can be used to control the cam to rotate between the inner wall of the flow channel and the flexible spoiler, and the distance between the free ends of the two first flexible spoilers 2 and the distance between the free ends of the two second flexible spoilers 3 can be adjusted to be 0.5 mm. When the fluid is required to be conveyed at a low forward flow rate, the distance between the free ends of the two first flexible spoilers 2 and the distance between the free ends of the two second flexible spoilers 3 are adjusted to be 0.2 mm. When the fluid is required to be conveyed at a high forward flow rate, the distance between the free ends of the two first flexible spoilers 2 and the distance between the free ends of the two second flexible spoilers 3 are adjusted to be 0 mm. In practical application, the distance between the free ends of the flexible turbulence assembly and an electric signal output by the electric control system can be adjusted according to practical conditions.

Example two

Referring to fig. 7, the present embodiment is different from the first embodiment in that: the first flow channel 6 and the second flow channel 7 both have certain flexibility, and specifically, the elastic modulus of the first flow channel 6 and the elastic modulus of the second flow channel 7 are both 2MPa to 7 MPa. The material of the first flow channel 6 and the second flow channel 7 is polydimethylsiloxane or silica gel. The adjusting mechanism 9 can make the flexible spoiler swing in the flow channel by extruding the outer wall of the flow channel, thereby changing the distance between the free ends of the two opposite flexible spoilers.

Preferably, the adjusting mechanism 9 includes a second control device, two third driving devices, two fourth driving devices, two third transmission devices 905, two fourth transmission devices 906, two third cam devices 907 symmetrically distributed on two sides of the first flow channel 6, and two fourth cam devices 908 symmetrically distributed on two sides of the second flow channel 7, an output end of the second control device is electrically connected with an input end of each third driving device and an input end of each fourth driving device respectively, an output end of the third driving device is connected with an input end of the third transmission device 905, an output end of the fourth driving device is connected with an input end of the fourth transmission device 906, an output end of the third transmission device 905 passes through the pump body 4 to be connected with the third cam devices 907, an output end of the fourth transmission device 906 passes through the pump body 4 to be connected with the fourth cam devices 908, the third cam devices 907 abuts against an outer wall of the first flow channel 6, the fourth cam device 908 is abutted against the outer wall of the second flow channel 7, and in a working state, the second control device controls each third driving device to drive each third transmission device 905 to rotate, so as to drive each third cam device 907 to rotate and extrude the side wall of the first flow channel 6, so as to change the distance between the second ends of the two first flexible spoiler 2; the second control device controls each fourth driving device to drive each fourth transmission device 906 to rotate, and drives each fourth cam device 908 to rotate and extrude the side wall of the second flow channel 7, so as to change the distance between the first end portions of the two second flexible spoiler 3.

The cam devices are located on two sides of the flow channel, and are in indirect contact with the flexible flow disturbing pieces through mechanical contact with the flexible flow channel, so that the distance between free ends of the two opposite flexible flow disturbing pieces is changed. In this embodiment, the second control device may be a PLC control system, and the third driving device and the fourth driving device may be driving motors. Third cam device 907 and fourth cam device 908 each comprise at least one cam. The cams are positioned on two sides of the flexible flow channel, and can extrude the flexible flow channel when rotating, so that the flexible flow disturbing piece swings in the flow channel. The third transmission device 905 and the fourth transmission device 906 both comprise a rotating shaft 9021, the input end of the rotating shaft 9021 is connected with the output end of the driving motor, a second sealing hole is formed in the pump body 4, and the output end of the rotating shaft 9021 penetrates through the pump body 4 through the second sealing hole to be connected with the cam. The adjusting mechanism 9 has simple structure and convenient operation. When the flexible spoiler 2 is used, a user can synchronously control the two third driving devices to operate through the second control device, so that the two third transmission devices 905 synchronously operate, the two third cam devices 907 synchronously rotate in the opposite directions and extrude the two outer walls of the first flow channel 6, the two first flexible spoiler 2 swing, and the free ends of the two first flexible spoiler 2 are close to or far away from each other. Similarly, the third control device synchronously controls the two fourth driving devices to operate, so that the effect of adjusting the distance between the two free ends in the second flexible turbulence assembly is achieved.

In this embodiment, when the bidirectional piezoelectric pump is required to reversely deliver fluid, the second control device may be used to control the cam to rotate on the outer wall of the flow channel, and the distance between the free ends of the two first flexible spoiler 2 and the distance between the free ends of the two second flexible spoiler 3 are adjusted to be 0.5 mm. When the fluid is required to be conveyed at a low forward flow rate, the distance between the free ends of the two first flexible spoilers 2 and the distance between the free ends of the two second flexible spoilers 3 are adjusted to be 0.2 mm. When the fluid is required to be conveyed at a high forward flow rate, the distance between the free ends of the two first flexible spoilers 2 and the distance between the free ends of the two second flexible spoilers 3 are adjusted to be 0 mm. In practical application, the distance between the free ends of the flexible turbulence assembly and an electric signal output by the electric control system can be adjusted according to practical conditions.

Except for the above differences, other structures of the present embodiment are the same as those of the first embodiment, and corresponding effects and principles are also the same, which are not described herein again.

EXAMPLE III

Referring to fig. 8 and 9, the present embodiment is different from the first and second embodiments in that: the adjusting mechanism 9 comprises a third control device located outside the pump body 4, a fifth driving device 910, a sixth driving device, a fifth transmission device 909, a sixth transmission device, two first magnets 911 located on two sides of the pump body 4, two second magnets 912 located on two sides of the pump body 4, two third magnets 913 and two fourth magnets 914 located inside the pump body 4, an output end of the third control device is electrically connected with an input end of the fifth driving device 910 and an input end of the sixth driving device respectively, an output end of the fifth driving device 910 is connected with an input end of the fifth transmission device 909, an output end of the sixth driving device is connected with an input end of the sixth transmission device, an output end of the fifth transmission device 909 is connected with each first magnet 911 respectively, an output end of the sixth transmission device is connected with each second magnet 912 respectively, each third magnet 913 is fixedly connected on one side of each first spoiler flexible member 2 close to the inner wall of the first flow channel 6, the fourth magnets 914 are fixedly connected to one side of each second flexible spoiler 3 close to the inner wall of the second flow channel 7, and in an operating state, the third control device synchronously controls the fifth driving device 910 to drive the fifth transmission device 909 to rotate, so that each first magnet 911 is close to or far away from each third magnet 913, and the distance between the second ends of the two first flexible spoilers 2 is changed; the third control device controls the sixth driving device to drive the sixth transmission device to rotate, so that each fourth magnet 914 is close to or far away from each fourth magnet 914, thereby changing the distance between the first end portions of the two second flexible spoilers 3.

The embodiment utilizes the distance change between two magnets for the free end swing of flexible vortex piece reaches the purpose of adjusting the free end interval of two flexible vortex pieces. The two first magnets 911 and the two second magnets 912 are respectively disposed on two sides of the pump body 4, and respectively correspond to the two first flexible spoiler 2 and the two second flexible spoiler 3. Two third magnets 913 and two fourth magnets 914 are adhered to a side of each first flexible spoiler 2 adjacent to the inner wall of the first flow channel 6 and a side of each second flexible spoiler 3 adjacent to the inner wall of the second flow channel 7, respectively. When the degree of freedom spacing of each flexible spoiler needs to be adjusted, the third control device synchronously controls the fifth driving device 910 and the sixth driving device to ensure that the fifth transmission device 909 and the sixth transmission device operate simultaneously, so that the two opposite flexible spoilers are always symmetrically distributed along the axis of the flow channel.

It should be noted that, in the present embodiment, the third magnet 913 and the fourth magnet 914 are both in the shape of a plate and are fixedly connected to the flexible spoiler. The third control means may be a PLC control system, and the fifth driving means 910 and the sixth driving means may be driving motors. The fifth transmission 909 and the sixth transmission are various as long as the transmission effect is achieved, and in the present embodiment, the transmission is preferably a screw kinematic pair mechanism. Specifically, the fifth transmission device 909 may include a first rotating member 9091, a second rotating member 9092, a first moving member 9093, a second moving member 9094, a guide rod 9095, and a connecting member 9096, wherein an output end of the fifth driving device 910 is connected to an input end of the first rotating member 9091, an output end of the first rotating member 9091 is connected to an input end of the connecting member 9096, and an output end of the connecting member 9096 is connected to the second moving member 9094. The first moving member 9093 is movably connected to the first rotating member 9091, and the second moving member 9094 is movably connected to the second rotating member 9092. The bottoms of the first moving piece 9093 and the second moving piece 9094 are both connected to the guide rod 9095 in a sliding manner, the top of the first moving piece 9093 is connected to the first magnet 911, the top of the second moving piece 9094 is connected to the other first magnet 911, and the guide rod 9095 is located right below the rotating pieces. In operation, the third control device controls the fifth driving device 910 to drive the first rotating member 9091 to rotate, so as to drive the first moving member 9093 to move on the first rotating member 9091, and simultaneously drive the connecting member 9096 to rotate, so as to rotate the second rotating member 9092, and simultaneously drive the second moving member 9094 to move. The guide bar 9095 has a limiting function, and the two first magnets 911 are prevented from moving randomly. Two first magnets 911 are connected at the top of two moving members, and are close to or keep away from the two-way piezoelectric pump along with the moving member, through changing the distance between first magnet 911 and the third magnet 913, influence the swing of first flexible spoiler 2, and then change the distance between the second tip of two first flexible spoiler 2. More specifically, the first rotating member 9091 and the second rotating member 9092 may be screw rods, and screw holes in threaded fit with the screw rods are formed in the middle of the two moving members, so that the moving members can move back and forth on the screw rods. Or, the first rotating member 9091 is a right-handed screw, the second rotating member 9092 is a left-handed screw, and the connecting member 9096 is a threaded sleeve, and both ends of the connecting member are respectively connected to the left-handed screw and the right-handed screw. The first moving piece 9093 and the second moving piece 9094 respectively comprise a gear in threaded fit with the screw rod and a fixing body rotatably connected to the inner ring of the gear, the bottom of the fixing body is in sliding connection with the guide rod 9095, and the top of the fixing body is fixedly connected with the first magnet 911. And the third control device controls the driving motor to drive the right-handed screw to rotate, so that the gear rotates on the right-handed screw to enable the fixed body and the magnet to generate displacement. The right-handed screw drives the sleeve to rotate, so that the left-handed screw rotates, and the gear connected to the left-handed screw moves. The screw, the gear, the fixed body, the first flow passage 6, the second flow passage 7 and the pump body 4 can be made of non-magnetic materials. Similarly, the internal structure of the sixth transmission is the same as that of the fifth transmission 909, and the description thereof is omitted.

Preferably, the polarities of the opposite surfaces of the two third magnets 913 are the same, and the polarities of the opposite surfaces of the two fourth magnets 914 are the same, so as to prevent the free ends of the two flexible spoilers from being connected together due to the opposite polarities of the opposite surfaces of the two magnets. The phenomenon that like magnetic poles repel each other and unlike magnetic poles attract each other is utilized, the distance between the free ends of the flexible structure group can be changed, and further the direction and the pumping quantity of fluid conveyed by the piezoelectric pump can be changed. In this embodiment, the opposite surfaces of the two third magnets 913 are S-poles, the surface of the third magnet 913 close to the inner wall of the flow passage is N-pole, and the surface of the first magnet 911 close to the pump body 4 is S-pole. When the S pole of the first magnet 911 is close to the pump body 4, the distance between the first magnet 911 and the third magnet 913 is reduced, and the distance between the free ends of the two first flexible spoilers 2 is increased. When the S pole of the first magnet 911 is far away from the pump body 4, the distance between the first magnet 911 and the third magnet 913 is increased, and the distance between the free ends of the two first flexible spoilers 2 is decreased until the two free ends make critical contact.

Adjusting the distance between the magnets can change the pumping direction and adjust the pumping volume. In this embodiment, when the bidirectional piezoelectric pump is required to reversely deliver fluid, the distance between the magnets can be adjusted to 0.5mm by adjusting the distance between the free ends of the two first flexible spoiler 2 and the distance between the free ends of the two second flexible spoiler 3. When the fluid is required to be conveyed at a low forward flow rate, the distance between the free ends of the two first flexible spoilers 2 and the distance between the free ends of the two second flexible spoilers 3 are adjusted to be 0.2 mm. When the fluid is required to be conveyed at a high forward flow rate, the distance between the free ends of the two first flexible spoilers 2 and the distance between the free ends of the two second flexible spoilers 3 are adjusted to be 0 mm. In practical application, the distance between the free ends of the flexible turbulence assembly and an electric signal output by the electric control system can be adjusted according to practical conditions.

Example four

Referring to fig. 10 and 11, the present embodiment is different from the first, second, and third embodiments in that the first flexible spoiler 2 and the second flexible spoiler 3 are made of different materials, and both the first flexible spoiler 2 and the second flexible spoiler 3 in the present embodiment are made of functional materials. First flexible spoiler 2 and second flexible spoiler 3 all include base plate layer 21, piezoceramics layer 22, silver foil layer 23 and insulating parcel layer 24, and piezoceramics layer 22 one side is connected on base plate layer 21, and piezoceramics layer 22's opposite side is connected on silver foil layer 23, and base plate layer 21, piezoceramics layer 22 and silver foil layer 23 are all wrapped up in insulating parcel in situ.

Further, the adjusting mechanism 9 includes two first electric controllers 915 and two second electric controllers 916, each first electric controller 915 is electrically connected to each first flexible spoiler 2, and each second electric controller 916 is electrically connected to each second flexible spoiler 3. The first electric controller 915 is connected to the silver foil layer 23 through a conducting wire, wherein the conducting wire is welded and fixed with the silver foil layer 23, and another conducting wire is welded on the substrate layer 21. The first electric controller 915 and the second electric controller 916 have functions similar to those of an electric control system, and provide electric signals for materials with inverse piezoelectric effect. Under the control of the electrical signal, the piezoelectric ceramic layer 22 deforms, and the distance between the free ends of the two first flexible spoiler 2 changes. The insulating wrapping layer 24 wraps the substrate layer 21, the piezoelectric ceramic layer 22 and the silver foil layer 23, so that the phenomenon of electric leakage cannot occur in the use process of the pump body 4. Similarly, the connection and operation principle of the second electric controller 916 and the second flexible spoiler 3 are the same as those of the first electric controller 915 and the first flexible spoiler 2, and the description thereof is omitted.

In this embodiment, when the bidirectional piezoelectric pump is required to reversely convey fluid, the electric controller may be used to output an electric signal, and the distance between the free ends of the two first flexible spoiler 2 and the distance between the free ends of the two second flexible spoiler 3 are adjusted to 0.5 mm. When the fluid is required to be conveyed at a low forward flow rate, the distance between the free ends of the two first flexible spoilers 2 and the distance between the free ends of the two second flexible spoilers 3 are adjusted to be 0.2 mm. When the fluid is required to be conveyed at a high forward flow rate, the distance between the free ends of the two first flexible spoilers 2 and the distance between the free ends of the two second flexible spoilers 3 are adjusted to be 0 mm. In practical application, the distance between the free ends of the flexible turbulence assembly and an electric signal output by the electric control system can be adjusted according to practical conditions.

It should be understood that the terms "first", "second", "third", "fourth", "fifth" and "sixth", etc., are used herein to describe various information, but the information should not be limited to these terms, which are used only to distinguish the same type of information from each other. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A bidirectional piezoelectric pump is characterized by comprising a pump body, an electric control system, an adjusting mechanism, a first flexible turbulence component, a second flexible turbulence component and a piezoelectric vibrator for changing the volume of the pump body,

the pump body is provided with a pump cavity, a first flow passage and a second flow passage which are communicated with the pump cavity and the outside, the top of the pump body is provided with a counter bore, the bottom of the counter bore is communicated with the pump cavity, the piezoelectric vibrator is connected with the bottom of the counter bore, the output end of the electric control system is electrically connected with the piezoelectric vibrator,

the first flexible turbulence component is provided with two first flexible turbulence parts which are symmetrically arranged along the central line of the first flow channel, each first flexible turbulence part comprises a first end part close to the pump cavity and a second end part far away from the pump cavity, the first end parts of the first flexible turbulence parts are fixedly connected with the inner wall of the first flow channel,

the second flexible turbulence component is provided with two second flexible turbulence parts which are symmetrically arranged along the central line of the second flow channel, each second flexible turbulence part comprises a first end part close to the pump cavity and a second end part far away from the pump cavity, the second end part of each second flexible turbulence part is fixedly connected with the inner wall of the second flow channel,

2. A bidirectional piezoelectric pump according to claim 1, wherein the first flow channel has first grooves symmetrically formed on inner walls of both sides thereof, the first end of the first flexible spoiler is connected to the first grooves to achieve connection with the inner walls of the first flow channel,

3. A bi-directional piezoelectric pump as claimed in claim 1, wherein the material of the first flexible spoiler and the material of the second flexible spoiler are each brass, stainless steel or plastic.

4. A bi-directional piezoelectric pump according to any one of claims 1 to 3, wherein the adjustment mechanism comprises a first control means, two first drive means, two second drive means, two first transmission means, two second transmission means, two symmetrically disposed first cam means and two symmetrically disposed second cam means,

the output end of the first control device is respectively and electrically connected with the input end of each first driving device and the input end of each second driving device, the output end of the first driving device is connected with the input end of the first transmission device, the output end of the second driving device is connected with the input end of the second transmission device, the output end of the first transmission device penetrates through the pump body and is connected with the first cam device, the output end of the second transmission device penetrates through the pump body and is connected with the second cam device, the first cam device is respectively and abutted against the inner wall of the first flow channel and one side of the first flexible turbulence member close to the inner wall of the first flow channel, and the second cam device is respectively and abutted against the inner wall of the second flow channel and one side of the second flexible turbulence member close to the inner wall of the second flow channel,

5. A bi-directional piezoelectric pump according to any one of claims 1 to 3, wherein the elastic modulus of the first flow path and the elastic modulus of the second flow path are both 2MPa to 7 MPa.

6. A bi-directional piezoelectric pump according to claim 5 wherein said adjustment mechanism includes a second control means, two third drive means, two fourth drive means, two third cam means symmetrically disposed on either side of said first flow path and two fourth cam means symmetrically disposed on either side of said second flow path,

the output end of the second control device is respectively electrically connected with the input end of each third driving device and the input end of each fourth driving device, the output end of the third driving device is connected with the input end of the third transmission device, the output end of the fourth driving device is connected with the input end of the fourth transmission device, the output end of the third transmission device penetrates through the pump body and is connected with the third cam device, the output end of the fourth transmission device penetrates through the pump body and is connected with the fourth cam device, the third cam device is abutted against the outer wall of the first flow passage, and the fourth cam device is abutted against the outer wall of the second flow passage,

7. A bi-directional piezoelectric pump according to any one of claims 1-3 wherein said adjustment mechanism comprises a third control means located outside said pump body, a fifth drive means, a sixth drive means, a fifth gear, a sixth gear, two first magnets located on either side of said pump body, two second magnets located on either side of said pump body, and two third magnets and two fourth magnets located within said pump body,

the output end of the third control device is electrically connected with the input end of the fifth driving device and the input end of the sixth driving device respectively, the output end of the fifth driving device is connected with the input end of the fifth transmission device, the output end of the sixth driving device is connected with the input end of the sixth transmission device, the output end of the fifth transmission device is connected with each first magnet respectively, the output end of the sixth transmission device is connected with each second magnet respectively, the third magnet is fixedly connected with one side of the first flexible turbulence member close to the inner wall of the first flow channel, and the fourth magnet is fixedly connected with one side of the second flexible turbulence member close to the inner wall of the second flow channel,

8. A bi-directional piezoelectric pump according to claim 7 wherein the faces of the two third magnets that face each other have the same polarity and the faces of the two fourth magnets that face each other have the same polarity.

9. A bi-directional piezoelectric pump according to claim 1 or 2, wherein the first and second flexible spoilers each include a substrate layer, a piezoelectric ceramic layer, a silver foil layer, and an insulating coating layer, one side of the piezoelectric ceramic layer being connected to the substrate layer, the other side of the piezoelectric ceramic layer being connected to the silver foil layer, and the substrate layer, the piezoelectric ceramic layer, and the silver foil layer being coated in the insulating coating layer.

10. A bi-directional piezoelectric pump according to claim 9, wherein the adjustment mechanism includes two first electrical controllers and two second electrical controllers, each of the first electrical controllers being electrically connected to each of the first compliant spoiler, and each of the second electrical controllers being electrically connected to each of the second compliant spoiler.