CN104100541A - Micro piezoelectric type axial flow fan - Google Patents

Abstract

The invention relates to a micro piezoelectric type axial flow fan comprising a piezoelectric oscillator and a base member. The base member is a rectangular block with small thickness, the top of the rectangular block is provided with a piezoelectric oscillator mounting groove, the center of the bottom of the piezoelectric oscillator mounting groove is provided with a cavity groove, and the piezoelectric oscillator is mounted in the piezoelectric oscillator mounting groove and form a sealed cavity with the cavity groove; the center of the bottom of the cavity groove is provided with a flow hole used for communicating the cavity with the outside air; two rectangular flat holes are formed in side faces of the base member on two perpendicular directions, the two rectangular flat holes are communicated with each other and with the flow hole to divide the flow hole into an inner flow hole portion and an outer flow hole portion; during operation, the piezoelectric oscillator produces reciprocating bending vibrations, the cavity volume is increased and decreased, fluid flow in and out through the flow hole, and air is absorbed through the rectangular flat holes and is exhausted through the outer flow hole. The micro piezoelectric type axial flow fan has the advantages of small size and simple structure.

Description

A kind of micro piezoelectric axial-flow blower

Technical field

The invention belongs to fluid transportation art, be specifically related to a kind of micro piezoelectric axial-flow blower.

Background technique

Piezoelectricity blower fan is a kind of fluid drive apparatus being driven by piezoelectric vibrator, its function is for providing the gas of certain flow in axial outlet port, can be used for the aspects such as active cooling in instrument and apparatus, detection facility and mechano-electronic field, gas conveying, pneumatic drive.Have be simple in structurely convenient to produce in enormous quantities, volume urine in microminiaturized, be convenient to Digital Control and the advantage such as the life-span is long.Piezoelectric fluid drive unit is in the past that piezoelectric pump is mainly used for carrying liquid, and carry the effect of gas unsatisfactory, mainly owing to having a valve pump structure complexity in piezoelectric pump in the past, although can provide larger delivery pressure but too small as its air quantity providing of application of blower fan or cooling system, limit its application; And valveless pump structure in the past designs mainly for liquid, and gas has different characteristics from liquid aspect flow resistance and flow characteristic, therefore in the problem that need to solve gas transfer rate aspect piezoelectricity blower fan.

Summary of the invention

In order to solve the problem that current piezoelectric fluid driving arrangement propellant ability is weak, fluid delivery rate is low, a kind of micro piezoelectric axial-flow blower has been proposed, this piezoelectricity type axial-flow blower is made up of piezoelectric vibrator and base member, this arrangement has feature simple in structure, to be convenient to mass production, and is particularly suitable for carrying gas.

To achieve these goals, the present invention is by the following technical solutions:

A kind of micro piezoelectric axial-flow blower of the present invention, comprises piezoelectric vibrator and base member, wherein:

Piezoelectric vibrator is piezoelectric material thin slice and the bonding formation of elastic base plate, and under the effect of alternating voltage, the to-and-fro motion along its axial direction can occur at piezoelectric vibrator center;

Described base member is a rectangular block that thickness is less, on its end face, be furnished with a piezoelectric vibrator mounting groove, piezoelectric vibrator is arranged in described piezoelectric vibrator mounting groove, the degree of depth of piezoelectric vibrator mounting groove is greater than total thickness and the piezoelectric vibrator central point displacement peak value sum of piezoelectric vibrator, to ensure that the motion that rear piezoelectric vibrator is installed is not interfered; Be furnished with a cavity groove in the bottom centre of described piezoelectric vibrator mounting groove, the degree of depth of described cavity groove is greater than the motion amplitude of piezoelectric vibrator central point and is less than 2mm, when the displacement of guarantee piezoelectric vibrator is not interfered, can reduce the impact that gas compressibility produces; Piezoelectric vibrator after installation and cavity groove form the cavity of sealing; Be furnished with a flowing hole in the central position of described cavity groove bottom, this flowing hole is communicated with described cavity with outside air; In two of the sides of base member, vertical direction is all furnished with the flat hole of rectangle, and the two flat holes of rectangle connect mutually, and connects with described flowing hole, and flowing hole is divided into inner flowing hole and outside flowing hole two-part.

Described matrix is configured to single part, without assembling, in forming fluid conveying function, there is the feature of being convenient to extensive automation assembling, compared with the scheme that forms matrix with many assembling parts in the past, there is clear superiority, only need coordinate with piezoelectric vibrator and can form final micro piezoelectric complete blower.

When work, there is reciprocal bending deflection in piezoelectric vibrator under the effect of alternating voltage, and the volume of cavity increases along with the motion of piezoelectric vibrator and reduces.The flow resistance of flowing hole direction is less, and when cavity volume changes the pressure difference Fluid Motion Driven By Moving forming, fluid mainly flows into by inner and outside flowing hole and flows out.When cavity volume increases, gas flows into inner flowing hole by outside flowing hole, in the time of the flat hole of rectangle by perpendicular, because liquid speed has formed a local depression district soon, extraneous gas can flow into along the flat hole of rectangle, and the gas of inflow is along with the gas that flows into inner flowing hole from outside flowing hole together enters pump chamber; When cavity volume reduces, gas discharges from cavity, flow to outside flowing hole through inner flowing hole, and discharge from outside flowing hole, when by the flat hole of rectangle, occur local depression district, extraneous gas can flow into along the flat hole of rectangle, and the extraneous gas of inflow can together be discharged from outside flowing hole along with the gas that flows to outside flowing hole from inner flowing hole.In a work cycle, all the time there is a low pressure area in the flat hole of rectangle and flowing hole intersection, be that extraneous gas all can be inhaled in two processes, and the final gas sucking can flow out from outside flowing hole, the gas flow of discharging from outside flowing hole is greater than the gas flow sucking from outside flowing hole, finally form gas and flowed into from the flat hole of rectangle, from outside flowing hole effluent air directed driven ability.

Brief description of the drawings

Fig. 1 is a kind of micro piezoelectric axial-flow blower of the present invention structural representation.

Fig. 2 is the complete machine figure of a kind of micro piezoelectric axial-flow blower of the present invention.

Embodiment

See figures.1.and.2, micro piezoelectric axial-flow blower of the present invention is to be made up of piezoelectric vibrator 1 and base member 2, wherein:

Piezoelectric vibrator 1 is made up of with elastic base plate 12 is bonding piezoceramic material thin slice 11;

Described base member 2 is the rectangular blocks that thickness is less, on its end face, be furnished with a piezoelectric vibrator mounting groove 21, piezoelectric vibrator 1 is arranged in described piezoelectric vibrator mounting groove 21, and the degree of depth of piezoelectric vibrator mounting groove 21 is greater than total thickness and the piezoelectric vibrator central point displacement peak value sum of piezoelectric vibrator 1; Be furnished with a cavity groove 22 in the bottom centre of described piezoelectric vibrator mounting groove 21, the degree of depth of described cavity groove 22 is greater than the motion amplitude of piezoelectric vibrator 1 central point and is less than 2mm; Piezoelectric vibrator 1 after installation is pump chamber 3 with the cavity that cavity groove 22 forms sealing; Central position in described cavity groove 22 bottoms is furnished with a flowing hole 23, and this flowing hole 23 is communicated with described cavity 3 with outside air; Be furnished with the flat hole 24 of rectangle and 25, the two flat holes of rectangle, the flat hole of rectangle connect mutually in the vertical direction in two of the sides of base member 2, and connect with described flowing hole 23, flowing hole 23 is divided into inner flowing hole 231 and outside flowing hole 232 two-part.

Claims (2)

1. a micro piezoelectric axial-flow blower, comprise: piezoelectric vibrator (1) and base member (2), wherein: described base member (2) is a rectangular block that thickness is less, on its end face, be furnished with a piezoelectric vibrator mounting groove (21), piezoelectric vibrator (1) is arranged in described piezoelectric vibrator mounting groove (21); Be furnished with a cavity groove (22) in the bottom centre of described piezoelectric vibrator mounting groove (21); Piezoelectric vibrator (1) after installation forms with cavity groove (22) cavity (3) sealing; Central position in described cavity groove (22) bottom is furnished with a flowing hole (23), and this flowing hole (23) is communicated with described cavity (3) with outside air; In two of the sides of base member (2), vertical direction is furnished with the flat hole of rectangle (24) and the flat hole of rectangle (25), the two flat holes of rectangle connect mutually, and connect with described flowing hole (23), flowing hole (23) is divided into inner flowing hole (231) and outside flowing hole (232) two-part.

2. micro piezoelectric axial-flow blower according to claim 1, it is characterized in that: described piezoelectric vibrator (1) can adopt by a slice piezoelectric material thin slice (11) and stick on the upper single-chip piezoelectric vibrator forming of elastic base plate (12), also can adopt by two piezoelectric material thin slices (11) and stick on the twin lamella piezoelectric vibrator that elastic base plate (12) both sides form.