CN104668126A

CN104668126A - Precision spraying valve

Info

Publication number: CN104668126A
Application number: CN201510034605.7A
Authority: CN
Inventors: 刘建芳
Original assignee: Changzhou Gaokai Precision Machinery Co Ltd
Current assignee: Changzhou Gaokai Precision Machinery Co Ltd
Priority date: 2015-01-23
Filing date: 2015-01-23
Publication date: 2015-06-03

Abstract

The invention relates to a precision spraying valve with a piezoelectric wafer serving as a driving source. The precision spraying valve comprises a cavity, a one-way valve, the piezoelectric wafer, a needle head, a gas hood and the like. The piezoelectric wafer serving as the driving source presses spraying materials into the needle head, compressed gas in the gas hood descends to disperse the spraying materials into tiny liquid beads to be deposited on the surface of a workpiece. Since a traditional needle valve is not used for controlling spraying or spraying stop of the spraying materials, when the precision spraying valve is used for precision spraying, large edge allowance caused by factors such as eccentricity and form and location tolerance of the needle valve is eliminated.

Description

A kind of accurate spraying valve

Technical field

The present invention relates to a kind of accurate spraying valve.

Background technology

Spraying valve is applied in the spraying of the materials such as three anti-paints, ink, solvent widely.Chinese patent 200920134037.8 discloses a kind of spraying valve, is also a spraying valve be most widely used, and its minimum widith that can spray is larger, and general minimum widith is greater than 5mm, and edge tolerance is also very large, is generally ± 2mm.For the small spraying of precision (width is less than the workpiece of 3mm), edge tolerance seems particularly evident, and general way is placed in the effective width of spraying valve by spraying workpiece, and for not needing the position sprayed to protect, use extremely inconvenient.Tolerance large, uneven main cause in edge is caused to be: because quantity for spray is little, the distance that striker is opened is smaller, the amount going out the sprayed on material of valve port along striker is also very little, surface tension serves leading role for the flowing of sprayed on material, it flows and is easy to maldistribution, some along nozzle inner walls, some along striker tip, material uneven also just result in atomization after edge tolerance very large.

Summary of the invention

In order to solve the problem that the above-mentioned spraying valve mentioned minimum spraying width is large, edge tolerance is large, the invention provides the spraying valve of a kind of piezoelectric chip as sprayed on material power source, comprising: cavity 1, check valve 2, piezoelectric chip 3, substrate 4, syringe needle 9, gas hood 8, hold-down nut 7.

The storage system of the sprayed on material of described spraying valve is made up of cavity 1, check valve 2, piezoelectric chip 3, substrate 4 and syringe needle 9.The inflow of check valve break-make sprayed on material, piezoelectric chip 3 and substrate 4 are fixed on cavity 1, and syringe needle 9 is fixedly connected in cavity 1 by female Luer.Piezoelectric chip 3 two ends apply the positive and negative voltage replaced, and the pressure of the sprayed on material in cavity 1 will produce fluctuation, and along with the continuous opening and closing of check valve 2, sprayed on material flows out uniformly from syringe needle 9.Further, the displacement bent due to piezoelectric chip about 3 is very little, by the adjustment of electric voltage frequency, can form very little flow, can meet the needs of small precision spraying.

The pneumatic system of described spraying valve is made up of cavity 1, pneumatic line 5, gas cavity 6, gas hood 8, syringe needle 9 and hold-down nut 7.Gas hood 8 is fixedly connected with cavity by hold-down nut 7, thus Compressed Gas enters into the gas cavity 6 of gas hood 8 from the pneumatic line 5 of cavity 1.The needle point 14 of syringe needle 9 is below the end 13 of gas hood 8, and such Compressed Gas flows downward until needle point 14 along syringe needle 9, and the drop 10 at needle point 14 place is separated into tiny liquid pearl 12.

The present invention has casted away the use of striker, but piezo-electric crystal 3 is supplied sprayed on material as power source, sprayed on material is pressed in syringe needle 9, thus solve sprayed on material in striker use procedure and to flow uneven problem, solve from root and cause the problem that spraying is uneven, edge tolerance is large.Below the end 13 needle point 14 of syringe needle 9 being placed in gas hood 8, the object of less spraying width can be reached, and syringe needle 9 can be changed at any time to regulate needle point 14 and the distance of gas hood 8 end 13, reach the object realizing different spraying width.

Accompanying drawing explanation

Fig. 1 is the cross section view of the accurate spraying valve of the present invention;

Fig. 2 is the present invention's accurate spraying valve spraying schematic diagram.

Detailed description of the invention

With reference to Fig. 1, cavity 1, check valve 2, piezoelectric chip 3, substrate 4 and syringe needle 9 constitute the feed system of sprayed on material.Check valve 2 is used for entering of break-make sprayed on material, piezoelectric chip 3 and substrate 4 provide the power needed for sprayed on material motion, syringe needle 9 is the syringe needle that some glue generally uses, and is connected in cavity 1 by female Luer, and can select different syringe needles 9 according to the width of spraying, thickness.In the cavity 15 of cavity 1, fill the material that will spray, then import 16 connects the sprayed on material of certain pressure, prepares to add in real time in cavity 15.Sprayed on material in external spray material, cavity 15, check valve 2 remain on poised state, piezoelectric chip 3 drives substrate 4 to be bent upwards under the effect of external drive voltage, space in cavity 15 becomes large, pressure diminishes, check valve 2 is opened, and a certain amount of external spray material enters into cavity 15 under the effect of the pressure; It is lower bending that piezoelectric chip 3 drives substrate 4 to think under the effect of outside backward voltage, and the space in cavity 15 diminishes, and pressure becomes large, and check valve 2 is closed, and a certain amount of sprayed on material is squeezed in syringe needle 9 under the effect of the pressure simultaneously.Because the bending displacement of piezoelectric chip 3 is very little, so the sprayed on material amount that single is squeezed in syringe needle 9 is also little, but the voltage of upper frequency (such as 100hz or higher) constantly acts on piezoelectric chip 3, the outflow sprayed on material stable from needle point 14 that will be stable in syringe needle 9, and its flow can by acting on voltage swing on piezoelectric chip 3 and frequency regulates.

Air inlet 17, pneumatic line 5, gas hood 8, gas cavity 6 constitute pneumatic system.With reference to Fig. 2, Compressed Gas enters into pneumatic line 5 by the air inlet 17 of cavity 1, then Compressed Gas enters into the air cavity 6 of gas hood 8 along pneumatic line 5, Compressed Gas sprays rear continuation from the end 13 of gas hood 8 and moves to needle point 14 along syringe needle 9, drop 10 endlessly has been formed at needle point 14 place, drop 10 is separated into tiny liquid pearl by Compressed Gas, is evenly scattered on the workpiece of needs spraying.

Claims

1. an accurate spraying valve, comprises cavity 1, check valve 2, piezo-electric crystal 3, substrate 4, gas hood 8, syringe needle 9; Described spraying valve, is characterized in that: sprayed on material is pressed in syringe needle 9 as drive source by piezo-electric crystal 3, and the Compressed Gas 11 in gas hood 8 is descending along syringe needle 9, and sprayed on material out from syringe needle 9 is separated into tiny liquid pearl.