CN1743670A

CN1743670A - Built-in corrugated channel valveless piezoelectric pump

Info

Publication number: CN1743670A
Application number: CN 200510112675
Authority: CN
Inventors: 张建辉; 夏齐霄; 李洪
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2005-10-14
Filing date: 2005-10-14
Publication date: 2006-03-08
Anticipated expiration: 2025-10-14
Also published as: CN100338362C

Abstract

This invention refers to a built in corrugated valve pressure free electric pump, which contains piezoelectric vibrator, corrugated path with variable width formed along two sides of axis of suction inlet and outlet, said shape constructed from series of crossed planes, each pairs of crossed planes forming a corrugated unit, adjacent corrugated unit having or not having space, a pair of corrugated unit opposite set on side wall constructing two flow channel with different taper to form path unit, the built corrugated path is composed of a series of path units. Said invention has not flow direction controller outer of pump cavity and makes pump micro miniaturization.

Description

Built-in corrugated channel valveless piezoelectric pump

Technical field

The invention belongs to field of fluid machinery, relate to a kind of built-in corrugated channel valveless piezoelectric pump.

Background technique

Press valve body classification if belong to the piezoelectric pump of positive displacement, can be divided into valve and Valveless piezoelectric pump are arranged.If valve is defined as: in the suction and discharge process of pump, have a time point at least, make pump chamber and suction port or discharge between, produce disconnected mechanical device, so so-called " valveless " is exactly: at any time, pump chamber is with inlet or arrange between the mouth and all be communicated with.At this moment, the one-way flow of fluid is to rely on special mechanical device.This device has utilized the character of fluid, makes pump chamber be communicated with exhaust port with suction all the time, and can order about one-directional fluid flow.At present, Valveless piezoelectric pump adopts the form of a pair of inverted each other conical flow pipe more.

Figure 1 shows that conical flow pipe Valveless piezoelectric pump.1 is the pump housing in Fig. 1, and 2 is piezoelectric vibrator, and 3 is that conical flow pipe A, 4 is for placing opposite conical flow pipe B with 3.Piezoelectric vibrator 2 is fixed on the pump housing as the loam cake of the pump housing 1.The a pair of opposite each other conical flow pipe of placing 3 and 4 is fixed on the suction port and exhaust port of the pump housing.Pump chamber has only two conical flow pipes 3 and 4 to be in communication with the outside.If the two ends at piezoelectric vibrator 2 apply alternating voltage, it will produce alternately elongation and contraction deformation, has just formed the volume-variation pump chamber like this in piezoelectric vibrator 2, the pump housing 1, two conical flow pipes 3 and 4 spaces of being formed.

For above-mentioned a pair of inverted each other conical flow tubular construction form, flow into the few conical flow pipe of pump chamber Fluid Volume during suction, outflow pump chamber Fluid Volume is many during discharge.Otherwise flow into the many conical flow pipes of pump chamber Fluid Volume when sucking, outflow pump chamber Fluid Volume is few during discharge.Said structure has also just constituted the pump that can realize dynamically that individual event is flowed.

Conical flow pipe Valveless piezoelectric pump has saved complicated valve body mechanism, helps the miniaturization of piezoelectric pump, improves reliability.But the conical flow pipe extends outward outside the pump chamber, has increased the physical dimension of piezoelectric pump undoubtedly, is unfavorable for the further miniaturization of piezoelectric pump, and particularly microminiaturization in MEMS and high density are integrated.

Summary of the invention

The object of the present invention is to provide a kind of Valveless piezoelectric pump that can further reduce volume and physical dimension with the microminiaturization that adapts to piezoelectric pump and in the application mechanically of micro/nano level yardstick, the size of piezoelectric pump is decided by the component of machine structure size to a great extent.The present invention has rejected the outer a pair of inverted each other conical flow tubular construction of pump chamber, make between pump chamber and suction port or the exhaust port, produce disconnected mechanical device, i.e. " valveless " mechanical device, substitute by the built-in corrugated channel constructional device, finished at any time, between pump chamber and suction port or the exhaust port all be communicated with and can realize the purpose that individual event is flowed, there is not the pump size of the outer inverted conical flow tubular construction of pump chamber to reduce significantly, and process easily than conical flow pipe at little manufacture field corrugated channel cavity bottom structure, precision also guarantees easily.The cost of built-in corrugated channel valveless piezoelectric pump will be lower than conical flow pipe valveless pressure significantly by comparison.

A kind of Valveless piezoelectric pump provided by the invention, as shown in Figure 2, piezoelectric vibrator 2 connects firmly with the pump housing 1, it is characterized in that: there is a built-in corrugated channel 5 pump chamber inside, built-in corrugated channel 5 is positioned at the right opposite of piezoelectric vibrator 2, it is the channel that forms change width along suction inlet and row mouthful axis both sides, the sidewall of channel is the ripple undulations, the ripple undulations is to be made of a series of planes of intersecting of not waiting with the folded angle of channel axis, every pair of intersecting plane constitutes a ripple unit, spacing (Fig. 3 (a)) is arranged between the adjacent corrugations unit or do not have spacing (Fig. 3 (b)), a pair of ripple staggered relatively unit constitutes two runners that tapering does not wait on the two side, form the channel unit, built-in corrugated channel 5 is made of a series of channels unit.

Fig. 4 is a built-in corrugated channel.It is made of a series of channel units in series.Each channel unit constitutes bellows-shaped by two planes of not waiting with the channel axis angle.The two sides of ripple is asymmetrical.Its objective is and utilize fluid when flowing along left and right two directions, because the folded acute angle difference of two corrugated surfaces, the flow resistance difference that produces, thereby when the piezoelectric vibrator to-and-fro motion, the fluid that reversing current is crossed in the pump chamber can produce difference in flow, and this difference in flow shows as the flow of fluid of single movement direction on macroscopic view.Concrete built-in corrugated channel valveless piezoelectric pump working principle can be made description below.

Fig. 5 is for inhaling the journey fundamental diagram.When piezoelectric vibrator 2 moves upward, that is: piezoelectric vibration 2 moves to the pump chamber increase of F-F position among Fig. 5 (a) from the E-E position, fluid is inhaled into pump chamber by built-in corrugated channel 5, because ripple is asymmetric, the top of ripple is divided into collapsible tube and expanding duct with asymmetric ripple, as for when being collapsible tube specifically, when be expanding duct, determine by the flow direction in the instantaneous pump.Consider any one the channel unit in the built-in corrugated channel 5, the built-in corrugated channel that does not wait at the inclination angle flows with a left side to the right simultaneously from a left side and right both sides respectively; The fluid of supposing this moment flows earlier from left to right, flows from right to left again; Because built-in corrugated channel Right deviation angle is less than left-leaning angle among Fig. 5 (a), inclination angle, the left and right sides all belongs to collapsible tube, but since the Right deviation angle less than left-leaning angle, the channel flow resistance is shunk less than left side contraction channel flow resistance in the right side of any one ripple in the built-in corrugated channel 5; In shrinking the channel section, flow resistance is big and flow is little, shrinks instantaneous flow that channel flows to the right from a left side less than the instantaneous flow that flows from right collapsible tube left.When flowing through narrow runner, aforesaid hypothesis flows, and just occurs in the right side of next narrow runner when flowing from left to right, the left side of next narrow runner when flowing from left to right again; Built-in corrugated channel Right deviation angle is less than left-leaning angle in Fig. 5 (a), and inclination angle, the left and right sides all belongs to expanding duct, but since the Right deviation angle less than left-leaning angle, the right side of ripple expansion channel flow resistance is less than left side expansion channel flow resistance in the built-in corrugated channel 5; In expansion channel section, flow resistance greatly then flow is little, and the instantaneous flow that flows to the right from left expanding duct is greater than the instantaneous flow that flows left from right expanding duct.And comprehensive The above results: when inhaling journey, ripple small inclination limit is greater than the flow of the instantaneous inflow pump chamber of the ripple decline arm of angle.

Scheduling working principle and suction Cheng Tongli.Can obtain with above-mentioned methods analyst, during scheduling, ripple small inclination limit is less than the flow of the instantaneous outflow pump chamber of the ripple decline arm of angle.

Appearance so repeatedly sucks and discharges engineering, ripple small inclination limit just becomes suction port on the macroscopic view, and the ripple decline arm of angle just becomes exhaust port, and fluid flows into pump chamber from ripple small inclination limit, fluid has just realized also that from the ripple decline arm of angle efflux pump chamber folk prescription is to flowing.

Description of drawings

Fig. 1 is traditional conical flow pipe Valveless piezoelectric pump;

Wherein:

1. the piezoelectric pump pump housing 2. piezoelectric vibrators 3. conical flow pipe A 4. conical flow pipe B

Fig. 2 is a built-in corrugated channel valveless piezoelectric pump of the present invention;

Fig. 2 (a) is the B-B cross section of Fig. 2 (b), and Fig. 2 (b) is the A-A cross section of Fig. 2 (a)

Wherein:

5. built-in corrugated channel

Fig. 3 is ripple units in series figure;

Fig. 3 (a) is two ripple unit distances continuously, and Fig. 3 (b) is that two ripple unit have spacing

Fig. 4 is the ripple abaculus;

Fig. 4 (a) is the A-A cross section of Fig. 4 (b), and Fig. 4 (b) is a plan view

Fig. 5 inhales the journey fundamental diagram;

Fig. 5 (a) is the B-B cross section of Fig. 5 (b), and the arrow of the left and right sides is represented fluid flow direction, and the arrow that makes progress is represented piezoelectric vibrator moving direction

Fig. 5 (b) is the A-A cross section of Fig. 5 (a), and the arrow of the left and right sides is represented fluid flow direction

Fig. 6 embodiments of the invention;

Fig. 6 (a) is the B-B cross section of Fig. 6 (b), and Fig. 6 (b) is the A-A cross section of Fig. 6 (a)

Wherein:

6. pump chamber covers 7. conduits

Embodiment

Specify the preferred embodiments of the present invention below in conjunction with accompanying drawing:

Structure such as Fig. 6 of the embodiment of the invention show that the employing piezoelectric vibrator is 30mm; Working power is voltage 220V, the 50Hz Ac; The α of built-in corrugated channel 5 ₁=90 °, α ₂=30 ° when ripple is counted n=4, is the experiment working medium with water, and the left and right sides runner of pump produces the water column that is pressure reduction 4mm to the maximum.

The commercially available sealer of conduit 7 usefulness is fixed on the pump chamber lid 6, the commercially available sealer of piezoelectric vibrator 2 usefulness is fixed on the pump chamber lid 6, built-in corrugated channel 5 adopts the mode of interference fit to be assembled together with the pump housing 1 before pump chamber lid 6 is installed, and pump chamber lid 6 tightens together with pump chamber 1 usefulness screw.Piezoelectric vibrator 2 is commercially available non-standard component, and screw is a standard piece, and the used part of other pump processes by plexiglass or metal.

Claims

1, built-in corrugated channel valveless piezoelectric pump, the piezoelectric vibrator (2) that comprises the pump housing (1), connects firmly with the pump housing (1) is characterized in that: also comprise the built-in corrugated channel (5) that is arranged on pump chamber inside, is positioned at the piezoelectric vibrator right opposite; Described built-in corrugated channel (5) is the channel that forms change width along suction inlet and row mouthful axis both sides, is made of channel unit serial connection; Wherein said channel unit is two runners that tapering does not wait that constitute by in suction inlet and row mouthful a pair of ripple staggered relatively unit, axis both sides; Described ripple unit is that the plane by the pair of intersecting that does not wait with the folded angle of channel axis constitutes, and spacing is arranged or do not have spacing between the adjacent ripple unit.