CN100338363C

CN100338363C - Rotary abaculus valveless piezoelectric pump

Info

Publication number: CN100338363C
Application number: CNB2005101142091A
Authority: CN
Inventors: 张建辉; 夏齐霄; 路计庄
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2005-10-21
Filing date: 2005-10-21
Publication date: 2007-09-19
Anticipated expiration: 2025-10-21
Also published as: CN1743671A

Abstract

The present invention relates to a piezoelectric pump without valves capable of changing flow capacity and flow directions. The obverse surface of a piezoelectric vibrator (2) is provided with a rotary insert block (5), wherein the rotary insert block (5) is in clearance fit with a pump body, and a surface facing toward the piezoelectric vibrator (2) is corrugated. Each corrugated unit is composed of two intersecting planes, wherein the acute angles included by the intersecting plane and the bottom surface of a pump cavity are unequal, and the corrugated unit and the piezoelectric vibrator (2) jointly form a conical flow pipe. The intersecting lines of the two planes of the corrugated unit are corrugated lines, the corrugated lines are parallel, the rotary insert block (5) can rotate in the cavity, and therefore, an inclination angle beta among the corrugated lines, the axis of a suction inlet and the axis of a discharge outlet can change from 0 DEG to 360 DEG to cause a sectional cone angle of a corrugated surface cut by a plane to change, which is equal to the fact that the cone angle of the conical flow pipe changes to cause the change of the flow capacity or the flow directions, wherein the plane passes through the axis of the suction inlet and the axis of the discharge outlet and is vertical to the piezoelectric vibrator. Under the condition that a frequency converter circuit does not need to be added, the present invention can achieve the flow capacity adjustment and the flow direction change of the pump only through rotating the insert block in the pump cavity.

Description

Rotary abaculus valveless piezoelectric pump

Technical field

The invention belongs to field of fluid machinery, relate to a kind of rotary abaculus 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 the process that spues of pump, have a time point at least, make pump chamber and suction port or spue 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.The adjusting of pump duty then relies on frequency changer circuit, is applied to the flow that the frequency of voltage on the piezoelectric vibrator is come control pump by adjusting.This method not only needs complicated frequency changer circuit to come the control pump flow, and can not change the flow direction of fluid.

Summary of the invention

The object of the present invention is to provide and a kind ofly control the piezoelectric pump of the Valveless piezoelectric pump duty and the flow direction, be aided with the pattern that control piezoelectric vibrator vibration frequency is come the control pump flow to substitute present conical flow pipe by rotation pump chamber embedded block.

The invention provides and a kind ofly need not additional frequency changer circuit and the Valveless piezoelectric pump of controlled change flow, and the present invention not only can change the flow of Valveless piezoelectric pump, and can change the flow direction of Valveless piezoelectric pump.The technical solution adopted in the present invention is referring to Fig. 2～3, piezoelectric vibrator 2 connects firmly with the pump housing 6, the right opposite of piezoelectric vibrator 2 is a rotatable rotary abaculus 5, this rotary abaculus 5 connects with the pump housing 6 Spielpassung, the one side that rotary abaculus 5 faces piezoelectric vibrator 2 is the ripple undulations, each ripple unit constitutes asymmetric undulations by two planes of intersecting of not waiting with the folded acute angle in pump chamber bottom surface, constitute tapered runner between this group ripple unit and the piezoelectric vibrator 2, the intersection that constitutes two planes of ripple unit is called wave molding, all the wave molding of ripple unit constitutes one group of parallel lines, because rotary abaculus 5 can rotate in the pump housing, so wave molding and pump chamber suction port, the angle β that the axis of exhaust port forms can change between 0 ° to 360 °, this variation can cause that relief is changed by the cone angle in the cross section of crossing suction port and exhaust port axis and cutting perpendicular to the plane of piezoelectric vibrator, change has taken place in the cone angle that is equivalent to the conical flow pipe, thereby cause the variation of flow and flow direction: when angle of inclination beta=0 °, flow is 0; When angle of inclination beta=90 °, the flow maximum; Flow is when angle of inclination beta＞90 °, and flow reduces; When angle of inclination beta=180 °, flow is 0; When angle of inclination beta＞180 °, the flow direction of fluid changes; When angle of inclination beta=270 °, flow maximum in the other direction.

D among Fig. 3 (b) ₁-D ₁, D ₂-D ₂... D _N-1-D _N-1, D _n-D _nBe the intersection on ripple plane, i.e. wave molding.D ₁-D ₁, D ₂-D ₂... D _N-1-D _N-1, D _n-D _nBetween be parallel to each other.The axis of suction port and exhaust port is C-C; Then C-C and random wave streakline D _i-D _iWhen becoming the zero degree angle, rotary abaculus valveless piezoelectric pump can not be realized FLUID TRANSPORTATION, C-C and D _i-D _iWhen becoming the non-zero angle angle, rotary abaculus valveless piezoelectric pump all can be realized FLUID TRANSPORTATION.

Owing to the acute angle that ripple and pump chamber bottom surface are folded is different, thus the flow resistance difference that produces, thus 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.The Valveless piezoelectric pump working principle of concrete rotation rotary abaculus can be made description below.

Fig. 4 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. 4 (a) from the E-E position, fluid is inhaled into pump chamber by rotary abaculus 5, because the existence of asymmetric ripple, the mountain top of asymmetric 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 ripple in the rotary abaculus 5, the rotary abaculus 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; Suppose the mobile left side that occurs in mountain top when flowing from left to right of this moment, the right side on mountain top when flowing from right to left again; Rotary abaculus Right deviation angle is less than left-leaning angle in Fig. 3 (a), and inclination angle, the left and right sides all belongs to collapsible tube, but since the Right deviation angle less than left-leaning angle, the right collapsible tube flow resistance of any one ripple is less than left collapsible tube flow resistance in the rotary abaculus 5; In shrinking pipeline section, the big flow of flow resistance is little, and the instantaneous flow that flows to the right from left collapsible tube is less than the instantaneous flow that flows left from right collapsible tube.Cross the mountain top when flowing, aforesaid hypothesis flows, and just occurs in the right side on next mountain top when flowing from left to right, the left side on next mountain top when flowing from left to right again; Rotary abaculus Right deviation angle is less than left-leaning angle in Fig. 3 (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 expanding duct flow resistance of ripple is less than left expanding duct flow resistance in the rotary abaculus 5; In the expansion pipeline section, the big flow of flow resistance 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.

When the cone angle of collapsible tube or expanding duct changed, corresponding variation also took place in its flow resistance.Using this principle can realize realizing regulating pump duty by rotation rotary abaculus 5.Defined suction port and exhaust port axis and be principal plane, as shown in Figure 5 perpendicular to the plane of piezoelectric vibrator.The flow direction of fluid macroscopic view is along the principal plane direction.When rotary abaculus 5 rotations, each ripple unit is changed by the angle of the triangular-section that principal plane P is cut, and promptly variation has taken place for cone angle ∠ BDC and ∠ CBD.This mobile flow resistance of fluid that will cause flowing through them changes, thereby causes the variation of the flow or the flow direction.When angle of inclination beta=0 °, flow is 0.When angle of inclination beta=90 °, the flow maximum.Flow is when angle of inclination beta＞90 °, and flow reduces.When angle of inclination beta=180 °, flow is 0.When angle of inclination beta＞180 °, the flow direction of fluid changes.When angle of inclination beta=270 °, flow maximum in the other direction.

The present invention has abandoned the conical flow pipe, and can only just can finish the Flow-rate adjustment of pump by the abaculus in the rotation pump chamber under the situation that does not need additional frequency changer circuit.And the present invention not only can regulate the flow of Valveless piezoelectric pump, and can change the flow direction by the fluid of Valveless piezoelectric pump, and promptly pump intake and exhaust port can be put upside down mutually.

Description of drawings

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

Wherein:

1, the conical flow pipe piezoelectric pump pump housing 2, piezoelectric vibrator 3, conical flow pipe A 4, conical flow pipe B

Fig. 2 is a rotary abaculus valveless piezoelectric pump of the present invention;

Fig. 2 (a) is the C-C cross section of Fig. 2 (b), and Fig. 2 (b) is the A-A cross section of Fig. 2 (a); Wherein:

5, rotary abaculus 6, the rotary abaculus piezoelectric pump pump housing

Fig. 3 (a) is the plan view of rotary abaculus;

Fig. 3 (b) is the shaft side figure of rotary abaculus;

Fig. 4 inhales the journey fundamental diagram;

Fig. 5 ripple unit is by schematic representation that principal plane cuts;

Fig. 6 embodiments of the invention;

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

Wherein:

7, sealing cover 8, fixed plate screw 9, conduit 10, pump chamber lid 11, screw

12, embedded magnet 13, external drive magnet.

Embodiment

Embodiments of the invention structure such as Fig. 6 show that the employing piezoelectric vibrator is 30mm; Working power is voltage 220V, the 50Hz Ac; The α of piezoelectric vibrator 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 6mm to the maximum.

The commercially available sealer of conduit 9 usefulness is fixed on the pump chamber loam cake 10, sealing cover 7 uses fixed plate screw 8 fixing with loam cake 10, rotary abaculus 5 adopts the mode of Spielpassung to be assembled together with the pump housing 6 before loam cake 10 is installed, embedded magnet 12 is glued in the rotary abaculus 5, and loam cake 10 tightens together with pump chamber 6 usefulness screws 11.Piezoelectric vibrator 2 is commercially available non-standard component, and screw 11 is a standard piece, and the used part of other pump processes by plexiglass or metal, and rotary abaculus 5 is driven by external drive magnet 13, and when external drive magnet 13 rotated, rotary abaculus 5 was driven to rotate.

Claims

1. Rotary insert valveless piezoelectric pump, including a pump body (6) and a piezoelectric vibrator (2) fixedly connected to the pump body (6), characterized in that a A rotatable rotary insert (5), the rotary insert (5) is connected with the pump body (6) in a clearance fit, and can rotate in the pump body (6), and the rotary insert (5) is facing the piezoelectric vibrator ( 2) One side is a corrugated undulating shape, and each corrugated unit consists of two intersecting planes with different acute angles with the bottom surface of the pump cavity to form an asymmetrical undulating shape. This group of corrugated units forms a cone with the piezoelectric vibrator (2). The corrugation lines of all the corrugation units form a group of parallel lines, and the corrugation lines are the intersection lines of two planes forming the corrugation unit.