Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
  • B05B7/02—Spray pistols; Apparatus for discharge
  • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
  • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
  • B05B7/0815—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
  • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
  • B05B15/52—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles
  • B05B15/531—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles using backflow
  • B05B15/534—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles using backflow by reversing the nozzle relative to the supply conduit
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
  • B05B7/02—Spray pistols; Apparatus for discharge
  • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
  • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
  • B05B7/0861—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with one single jet constituted by a liquid or a mixture containing a liquid and several gas jets

Definitions

• the subject of the present invention is a safety spray head, in particular for spray guns, comprising a central body and inside a rotating cylindrical element which contains a nozzle placed at the end of a main duct.
• Swiss patent CH 655 867 shows us a head which already has a rotary element, this element has a circular groove, the central body has a bore and between the two we can introduce a joint which has a section which adapts to this shape geometric and which allows the rotary element to be guided, positioned and maintained in its cavity inside the central body.
• This head allows the cleaning of the nozzle when it is blocked just by turning the rotary element by half a turn, with the help of a key.
• it does not offer the possibility of adapting air jets to introduce an adjustment relating to the opening and / or spraying of the fluid.
• heads that include the main duct and additional air channels to control or atomize the jet of fluid exiting the nozzle.
• these heads are not reversible and for any cleaning operation or change of nozzle one is obliged to disassemble them. It must be taken into account that the nozzles have a limited life because they are used with high pressure fluids which in large part are erosive and produce wear which changes the geometry of the nozzle. The life of a nozzle can be extended if it is manufactured with more wear-resistant materials such as tungsten carbide, but this will not prevent that at some point or another it will have to be replaced.
• the present invention seeks to overcome these drawbacks and to propose a head with a rotating element of extremely simple design which makes it possible to open the passage of the fluid under pressure and to stop it. In addition it is self-cleaning.
• the spray head comprises a cylindrical element rotatably mounted in a central body and traversed by a main duct at the end of which is mounted a spray nozzle sending a jet of high pressure fluid in the form of a spindle , the central body having low pressure air channels directed against the high pressure fluid jet and capable of being supplied and adjusted from the gun, characterized in that two low pressure air channels intended to open or close the spindle extend from the central body inside the cylindrical element, on either side of the central duct of the nozzle, the outlets of the air jets in the element cylindrical shape being thus offset from the inlet ports in communication with the channels of the central body, the two channels form at their outlet an acute angle with the central duct and p This allows you to open or close the spindle of fluid coming from the nozzle by adjusting the air jet flow rate.
• additional low pressure air channels intended to atomize the jet of pressurized fluid are placed in the central body, on either side of the cylindrical element, each channel has a outlet orifice directing the air jet on the jet of pressurized fluid, substantially perpendicular to the slot of the nozzle.
• the central body will advantageously have on its inside an elastic gasket in the form of a cylinder with sections of different diameter, the lower part being smaller than the upper part and the joint being crossed by an orifice along its axis coinciding with 1 • axis of the main duct.
• the head may have around the lower part of its central body a seal in the form of a ring so that when the head is connected to the gun the spindle adjustment channels and the atomization channels become completely independent.
• the cylindrical element which contains the nozzle has a fixing pin offset from the central axis, the pin abutting inside a groove made in the central body and being retained by the edge of this groove in the working position and in the cleaning position.
• Each channel intended to atomize the fluid jet may receive in its final part a cylinder closed at its upper end, which has a lateral slot of air outlet oriented at right angles to the nozzle slot.
• the head may have an advantageous form of a clamping nut to connect it to a spray gun.
• the drawing illustrates by way of example an embodiment of a spray head according to the invention.
• FIG. 1 shows a top view of a spray head
• FIG. 2 shows a section II-II along the axis of a cylindrical element of the head of FIG. 1, and
• FIG. 3 shows a section along line III-III of Figure 2, perpendicular to the axis of the cylindrical element.
• the head 1 is composed of a central body 2 and a rotary element 3 in the form of a cylinder.
• the central body 2 is connected to the gun 4 by a clamping nut 5.
• a seal 19 comprising a central duct 6 extending the main duct of the gun 4 is placed in the central body 2 which is crossed by four channels. Two of these channels 7, which extend throughout of the head 1 receive in their final part two cylinders 8 closed at their upper end.
• Each cylinder 8 has an air outlet slot 9 oriented at right angles to the axis of the cylinder.
• Each cylinder has at its lower part a notch 10 which makes it possible to position it in the channel 7.
• Two channels 11 offset by 90 degrees relative to the channels 7 and in alternation with them will open out against the rotary element 3.
• the latter its turn is crossed by two channels 12, the inlet orifices of which coincide with the outlet of the channels 11.
• Each channel 12 forms a bend, which has a certain inclination relative to the main duct of the nozzle, as described
• the elastic joint 19 made of polyamide has the shape of a cylinder with two sections of different diameter, the lower part being smaller than the upper part. It contains a central orifice 6 for passage along its axis.
• the seal 19 collaborates with the rotary element 3 while adapting perfectly to the geometry thereof.
• This configuration and the pressure exerted by the gun 4 will cause the surfaces in contact with the element 3 and the upper part of the seal 19 to be also sealed between the gun 4 and the lower part of the seal 19.
• Another ring-shaped nylon seal 14 surrounds the lower part of the central body and contributes to complete independence between the so-called spray or atomization channels 7,8 and the control channels 11,12. opening of the spindle supplied by independent gun air pressure pipes 4.
• the rotary element 3 also has a central pipe 13, continuation of the orifice 6 of the seal 19 of the central body 2.
• the spray nozzle 15 which in one embodiment preferential will be made of tungsten carbide. This nozzle is held for a pre-orifice 15a and a clamping screw 15b made of stainless steel.
• the rotary element 3 is crossed by a fixing pin 16 and, to make it rotate, it is secured to a key 17.
• This pin which is offset from the central axis, comes to bear against the body central and it is fixed between the groove 18 and the flange 20.
• the high-pressure fluid leaves the gun 4, passes through line 6 of the central body 2, line 13 of the rotary element 3 and arrives at the nozzle 15 which sends out like a spindle-shaped jet.
• the air which arrives at low pressure through the channels 7 is conveyed through the cylinders 8 to the slots 9 and is directed against the nozzle substantially perpendicular thereto to collaborate in atomizing the fluid. .
• the air which arrives through the channels 11, continues its path through the channels 12 of the rotary element and serves to control the opening of the spindle.
• the rotary element 3 is provided, as mentioned above, with a pin 16 which is fundamental in the operation of the assembly. It serves to limit the penetration of the cylinder into the central body and during rotation allows with the collaboration of a groove 18 made in the central body to rotate just half a turn each time, so that can change from the working configuration shown in the drawing to the cleaning configuration after a rotation of 180 degrees.
• the rotary element 3 is extracted in the intermediate position between the working position and the cleaning position in an easy manner, it suffices to turn the key 17 by approximately 90 degrees so that the pin 16 comes out of the groove 18 and then pull in the direction of its axis until it is completely outside the central body.
• This spray head is designed to be adapted to a gun 4 so that there is a supply of low pressure air which arrives from the gun to the head, outside the seal 14, to disturb the jet. fluid and atomize it, a valve in the gun will regulate the air supply.
• the gun will make a second supply of air which will reach the head between the seals 14 and 19, to allow the opening of the spindle to be adjusted; a second valve in the gun will control the air flow, so that more pressure means less opening.
• this same gun will bring the fluid, this time it will enter the spray head through the orifice 6 located inside the seal 19; a pump independent of the gun and placed before it will regulate the necessary supply of fluid on each occasion.
• the seal 19 is preferably made from a polyamide, as is the seal 14.
• the central body 2 as well as the rotary body 3 can be made of a light alloy or of aluminum, brass, steel or also of a polyester reinforced with fibers or glass beads. In the case where the manufacture of these parts is made from a polyester, we will take the precaution of adding carbon to it, so as to make them conductive.

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• Nozzles (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=4227554

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (4)

Family Cites Families (4)

• 1997
  • 1997-09-01 EP EP97936548A patent/EP0923417A1/de not_active Withdrawn
  • 1997-09-01 WO PCT/CH1997/000316 patent/WO1998009733A1/fr not_active Application Discontinuation
  • 1997-09-01 AU AU39368/97A patent/AU3936897A/en not_active Abandoned

Non-Patent Citations (1)

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