Classifications

• • 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

Definitions

• the subject of the present invention is a spray head, in particular for a high-pressure spray gun, comprising a rotary element placed inside a central body and traversed by a channel having a spray orifice and a seal ensuring the seal between the rotating element and the gun.
• Patent application PCT / CH97 / 00316 presents a spray head for a high-pressure spray gun, comprising a cylindrical element rotatably mounted in a central body and traversed by a main duct at the end of which is mounted a nozzle for spray sending a jet of high pressure fluid in the form of a spindle, two air channels based on pressure extending from the central body inside the cylindrical element, on either side of the central duct of the nozzle, the outlet openings of the air jets in the cylindrical element being offset with respect to the inlet openings in communication with the channels of the central body.
• Patent application PCT / CH98 / 00104 presents a spray head for a high-pressure spray gun comprising a rotary element placed in a body central and crossed by a channel having a spray orifice and a seal ensuring the seal between the rotary element and the gun, the rotary element has in its central part a spherical shape capable of collaborating with the seal placed inside of the central body and two circular seats placed on either side of the spherical part bearing on the seats placed on either side of the central body.
• the spray heads known in the prior art have the disadvantage of having the nozzle slot at a level substantially equal to or lower than the top of the spray head, which always produces interference at the outlet of the fluid jet.
• the liquid that could not leave the gun: dropped around the nozzle and therefore the user is under the permanent obligation to clean it to avoid accumulation dry paint around the nozzle slot and on the top of the spray head.
• the problem becomes even more acute when using spray heads with additional air jets, since the air jets cause turbulence creating deposits of fluid sedimentation on the top of the head. These deposits are particularly troublesome, because they give rise to droplets, which can be projected onto the objects to be treated by the air jets.
• the object of the present invention is to remedy these drawbacks and to propose a spray head, in particular for a high pressure spray gun comprising a rotary element placed in a central body and crossed by a spray nozzle and a seal. ensuring the seal between the rotary element and the gun, characterized in that the rotary element has a circular central part comprising the nozzle and introduced into a lateral opening of the central body, the circular central part being brought by an upward translation of the central body in a working position against at least one internal stop located at the top of the central body, the nozzle placed in the circular part of the rotary element being in the working position above the top of the central body.
• the nozzle placed on the central part can be raised and come out of the top of the head.
• the accumulation of paint on the device during use will be limited, as well as the residual deposits of the fluid likely to cause soiling on the parts to be sprayed or coated.
• the nozzle may have to exceed the height of the top of the head by a distance of 1 to 5 mm.
• the central part of the rotary element has at least one lateral shoulder in the form of an axis which collaborates with an extension in the form of a groove of the lateral opening of the central body, the groove of the central body allowing after the introduction of the rotary element inside the central body, the displacement of the rotary element upwards of the central body until the shoulder comes to bear against the internal stop from the top of the central body.
• the central part of the rotary element has a second shoulder of the central part opposite the first and also being in the form of an axis, the second shoulder cooperating with a groove formed on the other. side of the central body. The seal ensuring the seal between the central body and the gun slides in a bore made in the axis and at the base of the central body to come to bear against the circular central part of the rotary element.
• the circular central part of the rotary element has the form of a ball which collaborates with the seal inside the central body.
• the seal can advantageously have a groove so that the central part of the rotary element in the form of a ball rests on the two edges of the groove.
• the circular central part of the rotary element has the shape of a cylinder which collaborates with the seal inside the central body.
• the central body is advantageously traversed by a series of channels allowing a low-pressure air flow to adjust the opening angle of the spindle of fluid which exits through the nozzle, the channels being located on one side and on the other of the nozzle and forming at their exit an acute angle with the central duct of the nozzle.
• the central body has two lugs diametrically opposite to its upper part, the central body being traversed by two complementary channels which extend inside said lugs with outlet orifices directing a flow of low pressure air substantially perpendicular to the slot of the nozzle, against the spindle of pressurized fluid exiting the nozzle, producing atomization of said spindle of fluid.
• the rotary element has a pin which abuts against two edges of the central body to position itself in two ways which correspond to the working and cleaning configurations of the nozzle.
• the rotary element is connected to a handle which allows to rotate 180 ° between the two working and cleaning positions respectively.
• the rotary element is made of steel, stainless steel or chromed steel having in all cases received a heat treatment to harden its surface;
• the nozzle is made of hard metal, for example tungsten carbide;
• the central body in anodised aluminum, steel or a synthetic material reinforced with carbon fiber and the cylindrical joint in ferrous or non-ferrous metal or in reinforced composite material.
• the drawing illustrates, by way of example, a spray head according to the invention.
• FIG. 1 shows a view of a spray head of an embodiment of the head, partially in section with all the elements that compose it,
• FIG. 2 shows a top view of a rotary element, of the head
• FIG. 3 shows a side view of the rotary element of FIG. 2, with a section through its central part,
• FIG. 4 shows a side view of the central body
• FIG. 5 shows a section through the central body of FIG. 1,
• FIG. 6 shows a top view of the central body with a spray nozzle inside
• FIG. 7 shows a detail section of the central body along the line VII-VII of FIG. 6.
• FIG. 8 is a top view of a variant of the head shown in FIGS. 1 to 7,
• FIG. 9 is a sectional view along the line IX-IX of FIG. 8,
• FIG. 10 is a sectional view along the line X-X of FIG. 8, and
• FIG. 11 is a sectional view according to FIG. XI-XI of FIG. 8.
• the spray head 1 shown in the drawing comprises a central body 2 through which a rotary element 3 passes.
• a cylindrical seal 4 is introduced into an axial bore 4a formed in the central body, so as to be able to slide freely in said bore.
• the lower end of the seal 4 has a recess 5a in which is positioned an end seal 5, which has a central opening 7a leading to a central bore 7 formed in the cylindrical seal 4.
• the seal 4 has at its base a circular outer groove 6a in which is placed an “O-Ring” seal 6 intended to seal between the cylindrical seal 4 and the bore 4a of the central body 2.
• the central bore 7 of the seal 4 widens under form of a funnel 8 at its upper part to come to bear against the rotary element 3 as explained below.
• the rotary element 3 comprises a central part 31 in the form of a ball, two shoulders 32, respectively 32a, in the form of an axis (see also FIG. 3).
• the shoulders 32, respectively 32a have at their free end a truncated disc 33, respectively a disc 35.
• the truncated disc 33 comprises a pin 34 cooperating with a recess 34a formed in the central body 2 and serving as a stop.
• a rod 36 extends outwards from the disc 33, extends the shoulder 32 along the same axis and receives at its free end a handle 36a fixed by means of a pin 36b.
• the handle 36a can be overmolded in reinforced synthetic material.
• the cylindrical seal 4 has on its inner surface a V-shaped groove 41 in contact with the rotary element 3 which rests on the two edges of the groove 41.
• This groove can be in section in the form of a V or a U. Alternatively, it can be replaced by a circular seal 41a which will preferably be made of metal or of composite material.
• an insert or spray nozzle made of tungsten carbide 37 and a hollow screw 39, which tightens the insert 37, by means of 'An O-ring 38, which is placed between the nozzle and the screw which has a central bore not shown and is tightened using a hexagon wrench.
• the slot of the insert 37 is placed in the direction of the axis of the rotary element 3.
• the central body 2 (FIGS. 4 and 5) has a lateral opening 21 which is extended upwards by a groove 22, a second lateral opening 21a of a smaller dimension being on the side opposite the first and also extending by a groove as in the case of the lateral opening 21.
• Two pins 23 are placed at the top of the central body, each having an outlet orifice 25 in the direction of the axis of the central body and substantially perpendicular thereto.
• These orifices 25 are in communication with two channels 24, which pass through the wall of the central body in the direction of its axis and which are substantially perpendicular to the outlet orifices 25.
• These channels 24 are intended to send an air flow towards the top spray insert 37 at the base of the spray.
• Their outlet orifices 25 can be replaced by slots.
• Other channels 28 pass through the walls of the central body 2 in the direction of its axis to access the respective outlet orifices 29 (FIGS. 6 and 7) placed at the top of the central body and which form an acute angle with the spindle which exits through the slot in the nozzle.
• These four orifices 29 are intended to send an air flow which makes it possible to change the spray angle.
• a thread 28a is provided, which allows the introduction with a hexagon wrench of the screws 28b, which are used as air throttles. They are in the form of hollow screws with different bore diameters in order to vary the air flow. All the screws 28b in the same set have the same bore diameter. It is obvious that the channels 24 can also be provided with hollow screws 28b used for adjusting the air flow.
• the central body 2 has a groove in the form of a circular crown 27 collaborating for the connection with the gun and allowing the passage of low pressure air to the channels 24, 28.
• the guns used in connection with the spray nozzle which has just been described have a setting of compressed air which will be brought into the annular groove 27.
• the setting of the compressed air flows of the orifices 25, respectively 28 will be determined by the choice of the holes of the hollow screws 28b.
• the rotary element 3 is introduced into the central body 2 through the opening 21, the truncated disc 33 of diameter greater than the opening 21 fixes the position up to which the rotary element 3 can be introduced.
• the disc 35 will exit through the other side of the central body 2 through the opening 21a.
• the shoulders 32, 32a can slide along the grooves 22 towards the top of the central body 2 until said shoulders 32 strike the upper part of the notches 22.
• the rotary element 3 is then located at the top of the central body 2 and the spray nozzle 37 is located above said top.
• the seal 4 slides inside the bore 30 of the central body 2 to ensure the seal between the latter and the gun not shown in the drawing.
• the groove 41 of the cylindrical joint 4 provides greater tightness since the central part 31 of the rotary element 3, in the form of a ball in the drawing rests on the two edges of the groove 41.
• the cylindrical joint 4 has at its base the end seal 5 made of polyamide plastic (nylon) which will connect the head 1 to the gun and the seal
• the high pressure fluid arrives through the bores 7a, 7 and continues its path through the screw 39 and the nozzle 37 connected by the O-ring 38 in teflon.
• the fluid which will exit in the form of a spindle through the spray nozzle 37 can be regulated with the addition of air at low pressure by means of the two series of channels (24,28) which go in the direction of the axis of the central body and inside its walls.
• the pressurized air travels through the two channels 24 coming from the groove 27 at the base of the central body 2 and reaches the outlet orifices 25, which form a substantially right angle with the channels, the air at the base of pressure being projected substantially perpendicularly against the spindle of high pressure fluid which exits through the slot of the nozzle 37 reinforcing by this supply of air the atomization of said spindle of fluid.
• the low pressure air arrives at the channels 28 which also leave from the base of the central body 2 and travels inside the walls of said central body 2 to arrive at the orifices 29 which have an inclination relative to the channels 28.
• the pressure-based air passes through the channels 28 and leaves one side and the other of the nozzle 37, forming an acute angle with the central duct of the nozzle 37, so as to be able to adjust the opening angle of the spindle of fluid coming out through nozzle 37.
• the rotary element can rotate 180 ° and the nozzle 37 is then placed so that its slot faces the exit from the bore 7, ready for cleaning. This operation is very simple since the pin 34 will abut against the edges 26 of the recess 34a in the two opposite positions placing the rotary element 3 precisely in each case.
• the variant of the head shown in FIGS. 8 to 11 comprises a central body 2 crossed by a rotary element or identical key not shown in element 3 of the embodiment of FIGS. 1 to 7 and provided with a seal which is also not shown identical to the joint 4 of Figures 1 to 7.
• Figures 8 to 11 there has been shown only the central body 2, it being understood that all the elements constituting the central body, as well as all the elements constituting the head 2 and contributing to the functioning of the latter are the same as those of the embodiment of FIGS. 1 to 7.
• the lateral opening 21 extending upwards by a groove 22 allowing the rotary element or key 3 to be introduced into the head 2 and brought into the working position by an upward translation in the groove 22, as shown in Figure 11.
• the two pins 23 placed at the top of the head 2 also have the outlet orifice 50 which is in the variant in the form of a directing slot additional atomizing air at an angle of approximately 12 ° to the axis of the head.
• This angle of 12 ° can obviously vary within a range going from 0 to 20 ° if one wants to attack the jet at the exit of the nozzle or a little higher. This angle will also depend on the height between the top of the nozzle and the top of the head, which will be located within a range of 1 to 5 mm.
• the atomizing orifices 50 are supplied by the channels 24 identical to those of the embodiment of FIGS. 1 to 7.
• the channels 28 are in connection with the outlet orifices 29 opening at the top of the head 2.
• the outlet orifices 29 are two in number; there may however be more, for example 4 or 6.
• These outlet orifices 29 are, as in the embodiment of FIGS. 1 to 7 intended for additional air opening more or less the main jet beam. In the case where there are 4 of them, they will emerge on either side of the axis XI-XI of the section in Figure 11. In the case where there are 6 channels, they will be placed on both sides. 'other of the channels 28 of Figure 8.
• the outlet ports 29 will make an angle with the vertical axis of the head varying in a range from 45 to 60 °. In the variant of FIG. 11, the angle is 50 °.
• the rotary element or the key 3 is introduced into lateral openings 21 of the head 2 forming an axis of 45 ° (axis IX-IX of the section of FIG. 9) by relative to the two pins 23 (line XX- of Figure 8).
• the nozzle 51 (FIG. 8) will be placed at 45 ° relative to the axis of the rotary element or key 3.
• a groove 41 is placed around the periphery of the funnel where the spherical surface of the ball 31 is in contact with the interior of the seal.
• This groove 41 can be produced by machining, molding or by pushing the material of said seal.
• the groove 41 can be replaced by an overlap in the form of a circular zone 41a embedded in the interior of the cone, the zone 41a being in contact with the ball of the rotary element.
• the central body 2 is made of anodized aluminum; it can however be made of stainless steel, chrome steel or plastic reinforced with, for example carbon fibers.
• the rotary element 3 and the seal 4 can be made of metal, reinforced plastic or ceramic.

Landscapes

• Nozzles (AREA)
• Catching Or Destruction (AREA)
• Particle Formation And Scattering Control In Inkjet Printers (AREA)
• Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
• Fire-Detection Mechanisms (AREA)

Applications Claiming Priority (3)

Publications (2)

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Family Applications (1)

Country Status (14)

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Family Cites Families (6)

• 1999
  • 1999-07-07 CH CH01244/99A patent/CH693822A5/fr not_active IP Right Cessation
• 2000
  • 2000-05-17 ES ES00922409T patent/ES2225124T3/es not_active Expired - Lifetime
  • 2000-05-17 US US10/030,572 patent/US6863229B1/en not_active Expired - Fee Related
  • 2000-05-17 AT AT00922409T patent/ATE272450T1/de not_active IP Right Cessation
  • 2000-05-17 AU AU42837/00A patent/AU4283700A/en not_active Abandoned
  • 2000-05-17 CN CNB008072272A patent/CN1141186C/zh not_active Expired - Fee Related
  • 2000-05-17 PL PL00352474A patent/PL195896B1/pl not_active IP Right Cessation
  • 2000-05-17 DE DE60012740T patent/DE60012740T2/de not_active Expired - Lifetime
  • 2000-05-17 JP JP2001509315A patent/JP2003504184A/ja active Pending
  • 2000-05-17 WO PCT/CH2000/000274 patent/WO2001003853A1/fr active IP Right Grant
  • 2000-05-17 EP EP00922409A patent/EP1192011B1/de not_active Expired - Lifetime
  • 2000-05-17 RU RU2001133461/12A patent/RU2233203C2/ru not_active IP Right Cessation
  • 2000-05-17 BR BRPI0012228-9A patent/BR0012228B1/pt not_active IP Right Cessation
• 2001
  • 2001-01-18 TW TW090101164A patent/TW504406B/zh not_active IP Right Cessation

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