Summary of the invention
It is an object of the invention to overcome an above-mentioned technical difficult problem, it is provided that a kind of edge tolerance rate is low, spray range is big, thin
Membrane coat uniform new selective three-proofing coating precision spraying equipment, stable and reliable in work, simple to operate, for three-proofing coating spraying neck
Territory provides the most accurate spraying method, fills up the domestic blank in precision spraying field, breaks foreign technology in the field
Technical monopoly.
A kind of accurate spray valve described in invention include cylinder, fluid cylinder, regulation gland, piston, needle, swivel nut, compression leg,
Nozzle, nozzle fix seat, all gas sheet, gas hood, cavity shell, gas lid.
Described cylinder is attached fixing by screw thread with fluid cylinder, is positioned by boss simultaneously.
Described cylinder is attached fixing by screw thread with regulation gland.
Described piston is connected fixing with needle by interference fit, and is put in cylinder cavity formation matched in clearance.
Described compression leg external diameter contacts with cylinder inner wall, and internal diameter contacts with needle and ensures the circumferentially fixed of needle.
Described nozzle and nozzle are fixed seat and are fixed by the groove on nozzle carrier, and nozzle fixes the external diameter of seat and the interior of gas hood
Footpath forms matched in clearance, it is ensured that circumferentially positioned.
Described syringe needle is industrial conventional dispensing needle head.
What described needle and syringe needle fixed that the sealing means of seat directly uses metal and metal contacts sealing, needle and syringe needle
Fixing seat all has wolfram steel to make, and wolfram steel has the good characteristics such as intensity is high, wear-resistant.
The operation principle of the present invention:
The three-proofing coating solution of certain pressure is full of three-proofing coating storage barrel, enters into adaptor, fluid cylinder, nozzle fix seat and spray
In the cavity of mouth, having the preloading spring needle piston of certain pre compressed magnitude, under spring force, needle closely pastes with nozzle
Closing, formed and seal, now three-proofing coating solution is sealed in nozzle chamber;Open external electromagnetic valve, the compressed gas of certain pressure
Body enters in the cavity of cylinder, promotes needle piston upwards, and compression spring is until the upper contact of needle piston is to adjusting
Joint gland lower end, during needle piston upwards drive needle leave nozzle, three-proofing coating solution at nozzle along needle from
Nozzle exit flows out;The atomization gas of certain pressure enters in the gas passage of fluid cylinder, flows through all gas sheets, makes gas uniform
The cavity entering into gas hood in, then approach nozzle fixes the specific channel that seat outer chamber and gas hood inner chamber body are formed, and makes gas
More tranquilization, last uniform air-flow runs to nozzle exit, the three-proofing coating solution mist that will distribute from nozzle exit
It is melted into small drop, sprays from the exit of gas hood.The stroke of needle can be regulated by the position of tightening of regulation gland,
Thus controlling the flow of three-proofing coating solution, the stroke of needle is the biggest, and the flow of three-proofing coating solution is the biggest, and the thin film after atomization is coated with
Layer is the thickest.The pressure of atomization gas is the biggest, and the effect of atomization is the best, and the microdroplet after three-proofing coating solution atomization is the least, with
Thing area coverage also can increase, and meanwhile, if airflow direction control is bad, air-flow is unstable, and pressure is crossed conference and caused thin
The edge tolerance rate of membrane coat becomes big, and three-proofing coating can be sprayed on unwanted components and parts.
Detailed description of the invention
Refer to shown in Fig. 1, Fig. 2:
A kind of accurate spray valve of the present invention, mainly by cylinder (1), fluid cylinder (2), regulation gland (3), piston (4), valve
Pin (5), swivel nut (6), compression leg (7), nozzle (8), nozzle fix seat (9), all gas sheet (10), gas hood (11) composition.At cylinder
(1) cannelure is offered in lower end, and pad is placed in cannelure, forms an annular gap.Air-flow enters through all gas sheets (10)
Enter in gas hood.
Three-proofing coating solution with certain pressure enters in fluid cylinder (2), fixes seat (9) by fluid cylinder (2) and nozzle and arrives
Reach nozzle (8) place.Needle (5) and piston (4) use interference fit to connect, and install a prefastening force spring in piston (4) bottom,
Under spring force, needle fits tightly with nozzle, is formed and seals, and now three-proofing coating solution is sealed in nozzle chamber
In.When opening electromagnetic valve, compressed gas is known from experience promotion piston (4) and is moved upward, and now needle (5) leaves nozzle (8), and three-proofing coating is molten
Liquid flows out along needle (5) from nozzle (8) exit at nozzle, and the atomization gas of certain pressure enters into the gas of fluid cylinder (2)
In body passage, flow through all gas sheets (10), make gas uniformly enter in the cavity of gas hood, then approach nozzle fixes seat (9) outward
The specific channel that cavity is formed with gas hood (11) inner chamber body, makes gas more tranquilization, and last uniform air-flow runs to nozzle
(8) exit, the drop that the three-proofing coating solution mist that will distribute from nozzle (8) exit chemical conversion is small, from going out of gas hood (11)
Spray at Kou.