CN2216441Y

CN2216441Y - Superfine aluminium spray nozzle

Info

Publication number: CN2216441Y
Application number: CN 94221583
Authority: CN
Inventors: 国相杰; 王晓宇; 刘建军; 陈鸿
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-09-27
Filing date: 1994-09-27
Publication date: 1996-01-03
Anticipated expiration: 2004-09-27

Abstract

The utility model discloses a spray nozzle which is used for manufacturing aluminum powder by the spraying method. The superfine aluminium spray nozzle comprises a spray nozzle cover, a spray nozzle core, an inlet pipe and connecting pieces. The superfine aluminium spray nozzle is characterized in that the inlet pipe is arranged on the spray nozzle cover along the direction of the tangent to periphery of the spray nozzle core; the front end of an annular air duct which is arranged between the spray nozzle cover and the spray nozzle core is a contraction / expansion type supersonic speed passage. The ratio of the area between the throat and the nozzle is 1: 1.5 to 1: 1.25. The utility model has the advantages of reasonable design, simple structure, fine rate, large output, long service life, etc.

Description

A kind of ultra-fine aluminium nozzle for liquid

The utility model relates to aluminium powder manufacturing technology field, exactly is a kind of ultra-fine aluminium nozzle for liquid that spray-on process is made aluminium powder that is used for.

Atomization is the most frequently used method of aluminium powder of producing, and its process is with the aluminium ingot fusing, with pneumatic nozzle it is atomized into the aluminium droplet then, obtains aluminium powder after the cooling.The ducting outlet of existing aluminium nozzle for liquid all is contracting nozzles, can not maximally utilise the kinetic energy of atomization gas, and atomized particle size is thin inadequately, yields poorly, easily stops up, and service life is short.

The purpose of this utility model is to design a kind of atomization gas kinetic energy, ultra-fine aluminium nozzle for liquid that the fine powder rate is high of making full use of.

Design of the present utility model comprises nozzle cage, nozzle core, air inlet pipe and the connector that nozzle cage, nozzle core are linked together, it is characterized in that said air inlet pipe is installed on the nozzle cage along the direction of nozzle core tangent to periphery, the front end of nozzle core is the taper type that coning angle is α, the front end of nozzle cage endoporus is the taper type that coning angle is β, and angle α is greater than angle β, so that the front end of the annular passage between nozzle cage and the nozzle core constitutes the supersonic speed passage of a contraction-expansion, the area of its venturi is 1: 1.15 to 1: 1.25 with the ratio of area of injection orifice.

The utlity model has advantages such as kinetic energy simple in structure, reasonable in design, as can to make full use of atomization gas, the fine powder rate that this nozzle is produced aluminium powder is higher two to three times than existing nozzle, improves service life more than 50 times.

The utility model has following accompanying drawing:

The ultra-fine aluminium nozzle for liquid of Fig. 1 structural representation

Fig. 2 spiral-flow type air channel schematic diagram

Below in conjunction with accompanying drawing the utility model is elaborated.

Fig. 1 is the utility model structural representation, and it is the same with known nozzle, comprises nozzle Cover 1, nozzle core 2, air inlet pipe 4 and connector 5, air is from being opened in the air inlet on the nozzle cage 1 Enter in the pipe 4, connector 5 links together nozzle cage 1 and nozzle core 2. Because aluminium liquid is difficult for Pressurization generally can only adopt the injection method to produce. According to atomization of liquid theory, at liquid rerum natura (table Surface tension, granularity etc.) in certain situation, the fineness of the breakup of drop is by gas-liquid two-phase in the air-flow Relative kinetic energy determines that relative kinetic energy is more big, and the fragmentation of drop is more trickle. By aerodynamics Theory as can be known, the certain air-flow of interior energy reaches the maximum of its kinetic energy in speed of base Through deriving, flow velocity is the maximum that reaches its kinetic energy about 1.4 Mach numbers. The utility model basis Above-mentioned principle changes existing single contraction mouth structure the supersonic speed air channel of contraction-expansion into, Make the outlet kinetic energy of gas atomizing nozzle reach its theoretical limit. Feature of the present utility model exists The direction of 2 tangents to periphery is installed on the nozzle cage 1 in air inlet pipe 4 along nozzle core, and (referring to Fig. 2), Compressed air forms swirling eddy after entering annular passage between nozzle cage 1, the nozzle core 2, this The design that sample can radially enter along nozzle core has higher injection power. Nozzle core 2 Introduce aluminium liquid in the centre bore, the profile of nozzle core 2 front ends is taper type, and its coning angle is α; The endoporus front end of nozzle cage 1 also is taper type, and its coning angle is β, and angle α is greater than angle β, So that the front end of annular passage 3 consists of the supersonic speed passage of a contraction-expansion, i.e. air channel 3 Smallest cross-sectional not in the exit, but in the rear end of nozzle core 2 frustums, this place is called venturi 8, the sectional area of venturi 8 is 1: 1.5 to 1: 1.25 with the ratio of the sectional area of spout 7. Existing nozzle Fine powder (less than 200 orders, i.e. 74 μ) rate only be 20%～30%, constant in other condition In the situation, fine powder rate of the present utility model is 60%～70%, has improved two to three times.

The centering quality of nozzle cage, nozzle core also is a key factor that affects serviceability, Connect part with nut in the prior art, centering is relatively poor. Behind the nozzle core of the present utility model End has stepped two boss 9,10, and the outer surface of boss 9 is a circular cone that centering is used Face 11, the rear end of nozzle cage have one and boss 10 corresponding boss 12, adopt snap ring 5 as connecting Fitting, snap ring 5 be looped around boss 10,12 outside compress stuck, with nozzle cage 1 and nozzle Core is connected as a single entity. The inner surface of nozzle cage 1 rear end is one and uses with the suitable centering of taper seat 11 Taper seat 13, adopt two taper seats 11,13 to cooperatively interact and realize easily preferably centering.

Experiment shows that nozzle core 2 exit end faces stretch out nozzle cage 1 spout 7 end face certain distances can better work effect, and the distance of stretching out is in 1 to 3 millimeter scope.Aluminium liquid exports and around between its outer wind outlet 2～6 millimeters interval being arranged, promptly the wall thickness of the port of export of nozzle core (2) is 2 to 6 millimeters.

Below be a specific embodiments of the present utility model: adopt jade to make nozzle core 1, the venturi 8 of spout 7 is 1: 1.5 with the ratio of discharge area, the pressure of air inlet pipe 4 is 0.8MPa, nozzle core 2 stretches out 2 millimeters of spout 7 end faces, the injection pressure of nozzle is 500 millimeters of water, output is 8 kg/minute, and atomized particle size accounts for 60% of total amount less than 200 purpose aluminium powders, and bring up to more than 500 hours the service life of nozzle.

Claims

1. ultra-fine aluminium nozzle for liquid, comprise nozzle cage (1), nozzle core (2), air inlet pipe (4) and with nozzle cage (1), the connector (5) that nozzle core (2) links together, it is characterized in that said air inlet pipe (4) is installed on the nozzle cage (1) along the direction of nozzle core (2) tangent to periphery, the front end of nozzle core (2) is the taper type that coning angle is α, the front end of nozzle cage (1) endoporus is the taper type that coning angle is β, and angle α is greater than angle β, so that the front end of the annular passage (3) between nozzle cage (1) and the nozzle core (2) constitutes the supersonic speed passage of a contraction-expansion, the ratio of the area of area of its venturi (8) and spout (7) is 1: 1.15 to 1: 1.25.

2. nozzle according to claim 1, there are two stepped boss (9 rear end that it is characterized in that said nozzle core (2), 10), the outer surface of boss (9) is the taper seat (11) that a centering is used, there are one and the corresponding boss (12) of boss (10) in the rear end of said nozzle cage (1), the inner surface of nozzle cage (1) rear end is a taper seat (13) of using with the suitable centering of taper seat (11), said connector (5) is a snap ring, snap ring (5) is looped around boss (10,12) outside is connected as a single entity nozzle cage (1) and nozzle core (2).

3, nozzle according to claim 1 and 2, the exit end face that it is characterized in that said nozzle core (2) stretch out outer 1 to 3 millimeter of the spout (7) of nozzle cage (1), and the wall thickness of the port of export of nozzle core (2) is 2 to 6 millimeters.