EP4114578A1 - Pistolet de pulvérisation, en particulier pistolet de pulvérisation de peinture par atomisation d'air comprimé, en particulier pistolet de pulvérisation de peinture par atomisation d'air comprimé portatif - Google Patents

Pistolet de pulvérisation, en particulier pistolet de pulvérisation de peinture par atomisation d'air comprimé, en particulier pistolet de pulvérisation de peinture par atomisation d'air comprimé portatif

Info

Publication number
EP4114578A1
EP4114578A1 EP21706572.1A EP21706572A EP4114578A1 EP 4114578 A1 EP4114578 A1 EP 4114578A1 EP 21706572 A EP21706572 A EP 21706572A EP 4114578 A1 EP4114578 A1 EP 4114578A1
Authority
EP
European Patent Office
Prior art keywords
valve
air
actuating element
spray gun
actuated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21706572.1A
Other languages
German (de)
English (en)
Inventor
Norbert Maier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SATA GmbH and Co KG
Original Assignee
SATA GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SATA GmbH and Co KG filed Critical SATA GmbH and Co KG
Publication of EP4114578A1 publication Critical patent/EP4114578A1/fr
Pending legal-status Critical Current

Links

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
    • B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • B05B7/1209—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means for each liquid or other fluent material being manual and interdependent
    • B05B7/1245—A gas valve being opened before a liquid valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/002—Manually-actuated controlling means, e.g. push buttons, levers or triggers
    • 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
    • B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • B05B7/1254—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated
    • B05B7/1263—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated pneumatically actuated
    • B05B7/1272—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated pneumatically actuated actuated by gas involved in spraying, i.e. exiting the nozzle, e.g. as a spraying or jet shaping gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/004—Arrangements for controlling delivery; Arrangements for controlling the spray area comprising sensors for monitoring the delivery, e.g. by displaying the sensed value or generating an alarm
    • B05B12/006—Pressure or flow rate sensors
    • B05B12/008—Pressure or flow rate sensors integrated in or attached to a discharge apparatus, e.g. a spray gun
    • 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
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
    • 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
    • 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
    • B05B7/24—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 with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2402—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
    • B05B7/2478—Gun with a container which, in normal use, is located above the gun

Definitions

  • Spray gun in particular paint spray gun that atomizes compressed air, in particular hand-held paint spray gun that atomizes compressed air
  • the invention relates to a spray gun, in particular a paint spray gun that atomizes compressed air, in particular a hand-held compressed air atomized paint spray gun, according to the preamble of claim 1.
  • Spray guns especially paint spray guns, use different printing processes.
  • Conventional spray guns work with relatively high spray pressures of several bar.
  • HVLP guns the internal nozzle pressure is a maximum of 10 psi or 0.7 bar, which means that transfer rates of well over 65% can be achieved.
  • Compliant spray guns on the other hand, have an internal nozzle pressure of more than 10 psi or 0.7 bar, but also achieve a transfer rate of more than 65%.
  • the internal nozzle pressure of the spray gun is understood to be the pressure that prevails in the air cap of the spray gun. Often the atomizing air area is separated from the horn air area and the pressure in the atomizing air area can differ from that in the horn air area. However, the pressures in the atomizing air area and in the horn air area can also be the same.
  • a spray gun in particular a paint spray gun, in particular a paint spray gun that atomizes compressed air
  • the material nozzle often has a hollow cylindrical cone at its front end, from the front mouth of which the material to be sprayed emerges when the spray gun is in operation.
  • the material nozzle can, however, also have a conical design in its front area.
  • the gun head generally has an external thread, via which an air nozzle ring with an air cap arranged in it is screwed onto the gun head.
  • the air cap has a central opening, the diameter of which is greater than the outer diameter of the material nozzle cone or the outer diameter of the front end of a conical material nozzle.
  • the central opening of the air cap and the cone or the front end of the material nozzle together form an annular gap.
  • the so-called atomizing air emerges from this annular gap, which in the nozzle arrangement described above generates a negative pressure at the end face of the material nozzle, as a result of which the material to be sprayed is sucked out of the material nozzle.
  • the material to be atomized is fed into the atomizing air and torn into threads and ribbons. These threads and ribbons disintegrate due to their hydrodynamic instability, the Interaction between the fast-flowing compressed air and the ambient air and, due to aerodynamic disturbances, to droplets, which are blown away from the nozzle by the atomizing air.
  • the air cap often also has two horns which are diametrically opposed to one another and protrude in the outflow direction beyond the aforementioned annular gap and the material outlet opening.
  • Two supply bores i.e. horn air supply channels, run from the back of the air cap to horn air bores in the horns.
  • each horn has at least one horn air hole, but each horn preferably has at least two horn air holes from which the horn air exits.
  • the horn air bores are usually oriented in such a way that they point to the longitudinal axis of the nozzle in the exit direction after the annular gap, so that the so-called horn air exiting the horn air bores can influence the air that has already emerged from the annular gap or the paint jet or the paint mist that has already been at least partially created.
  • the paint jet or spray jet with an originally circular cross-section (round jet) is compressed on its sides facing the horns and lengthened in a direction perpendicular thereto. This creates a so-called broad jet, which allows a high surface painting speed.
  • the purpose of the horn air is to further atomize the spray jet.
  • air channels are usually introduced, with air from one of the channels, as described above, being passed to the said annular gap for use as atomizing air, and air from another channel, as described above, for Use as horn air is directed to the said horn air openings.
  • the air channels open into an end face of the head of the gun body and are guided to the annular gap or to the horn air bores via an air distributor arrangement.
  • the air distribution arrangement often includes an air distribution ring which separates the atomizing air area and the horn air area from one another.
  • a so-called driver is generally arranged, in particular pressed, on which a trigger guard engages when the user of the spray gun operates and thereby moves the material needle backwards and out of the material outlet opening of the material nozzle. whereby the material outlet opening is released for the material to be sprayed.
  • a stop usually limits the movement of the Trigger guard and thus the movement of the paint needle.
  • the trigger guard In the so-called full trigger situation, the trigger guard is activated to the maximum and the material nozzle is fully opened so that the maximum possible amount of material to be sprayed can be sucked out of the material nozzle as described above and fed to the atomizing air. If the trigger guard is partially or completely released, the trigger guard and material needle usually move back to their non-actuated starting position counter to the actuation direction due to a compression spring in each case.
  • the disadvantage is that the user of the spray gun always has to operate the trigger guard against the force of the compression springs. This is very troublesome, especially in the case of longer painting work.
  • EP 2 127 758 A1 therefore proposes a spray gun in which, on actuation of the trigger guard 5, on the one hand a needle 4 is pushed back through the trigger guard 5 and on the other hand air flows via a branch 21 into a cylinder 17 with a piston 16 , the piston 16 being connected to a needle 4.
  • the plunger 16 assists the trigger guard when the needle 4 is actuated by the application of air.
  • the object of the present invention is therefore to provide a spray gun which has a simple structure and by means of which it is possible to work with less fatigue than by means of spray guns according to the prior art.
  • a spray gun in particular by means of a compressed air atomizing paint spray gun, in particular by means of a hand-held compressed air atomizing paint spray gun, which has at least one air valve, in particular an air valve that can be actuated by means of at least one actuating element, in particular by means of at least one trigger guard, with at least one valve inlet area and at least one Valve outlet area, wherein the spray gun has at least one material valve, in particular for material to be sprayed, and wherein the at least one material valve is designed such that it can be pneumatically actuated, in particular openable, in particular exclusively pneumatically actuated, in particular openable, in particular where it is can be actuated, in particular opened, by means of air from the at least one valve outlet area, in particular that it can only be actuated by means of air from the at least one valve outlet area b can be actuated, in particular opened.
  • the spray gun can in particular be a gravity-feed gun, a hanging-cup gun, a side-cup gun or a tank gun.
  • the spray gun can in particular be used for spraying liquid media, in particular paint or varnish.
  • a paint spray gun that atomizes compressed air is understood to mean a paint spray gun in which the spray medium is atomized by means of compressed air as described above.
  • Compressed air atomizing paint spray guns are differentiated from so-called airless guns, in which the spray medium is atomized by being pressed through a very small opening, and so-called air-assisted airless guns, in which compressed air is used for re-atomization and / or to shape the spray jet , away.
  • the present invention can of course also be used with airless guns and air-assisted airless guns, in particular because the triggering force to be applied for the initial actuation of the trigger is very large with these types of gun.
  • Handheld paint spray guns are those that a human user holds in the hand and guides them during use. Hand-operated paint spray guns are thereby differentiated from so-called automatic guns and robot guns, which are installed in a painting system and / or guided by a painting robot.
  • the spray gun can be designed for spraying one component, but also for spraying several components. It can be an internal or external mixing spray gun.
  • the spray gun according to the invention has an air valve, an air valve in the present case generally being understood to mean a component for controlling the flow of air.
  • an air valve in the present case generally being understood to mean a component for controlling the flow of air.
  • all types of shut-off devices fall under the term valve, in particular also slides, flaps, taps or other components by means of which a volume flow can be controlled.
  • the air valve can be actuated, in particular opened and / or closed, by means of at least one actuating element, in particular by means of at least one trigger guard.
  • an actuating element which can preferably be designed like or similar to a spray gun trigger guard according to the prior art, but also in the form of a rotary knob, a lever or another operating element or can have such, is actuated, in particular pressed, pulled, rotated, is, whereupon the air valve performs an action, in particular opens or closes, either completely or partially.
  • the air valve has at least one valve inlet area and at least one valve outlet area, wherein the valve inlet area can generally be understood to mean an area, a section, a channel, a chamber or the like which is arranged upstream of the closure part of the air valve, in particular from the or from which air is supplied from the closure part of the air valve, in particular from which or from which air flows to the closure part of the air valve.
  • the valve outlet area can generally be an area, a section, a channel, a chamber or the like, which is arranged downstream of the closure part of the air valve to which air is supplied from the open closure part of the air valve, in particular into the air valve. flows into the air from the open closure part of the air valve.
  • the spray gun according to the invention also has at least one material valve, in particular for material to be sprayed.
  • the material valve can be designed like or similar to a material nozzle according to the prior art and / or have a material nozzle or a similarly designed component.
  • the material valve preferably has a closure part which opens and / or closes the passage through the material valve, either completely or partially, and which can be designed, for example, as a material needle as known in the prior art or similar thereto.
  • the closure part can, however, also be designed as a diaphragm, ball, slide, flap or the like, in particular as another shut-off element, and / or have such a component.
  • the material valve is designed in particular such that the flow rate, in particular the volume flow, of a material to be sprayed by the spray gun can be controlled, in particular the amount, in particular the volume flow, of the material to be sprayed leaving the material valve.
  • the present material valve can form the material outlet of the spray gun, similar to the material nozzle of a spray gun according to the prior art, but it can also be arranged upstream of a material outlet of the spray gun.
  • the at least one material valve is designed in such a way that it can be pneumatically actuated, in particular opened, in particular exclusively pneumatically actuated, in particular opened.
  • the pneumatic actuation can also include holding the material valve and / or a closure part of the material valve.
  • the air can generate a force, in particular on the material valve and / or a closure part and / or on a part connected to it, whereby the material valve and / or the closure part of the Material valve experience a change of state, in particular are moved.
  • the air can, for example, flow to, in particular to, a material valve and / or a closure part and / or to a part connected to it and thereby actuate the material valve. Additionally or alternatively, an air pressure can be applied to a material valve and / or a closure part and / or to a part connected thereto, whereby the material valve is actuated.
  • the material valve and / or the closure part of the material valve preferably remains in a certain state, in particular the material valve can remain in a certain actuation state .
  • the material valve is preferably actuated exclusively by air, in particular compressed air, in particular exclusively by the action of air.
  • air in particular compressed air
  • actuating the material valve which actuation in the present case preferably means opening, in particular completely and / or partially opening, of the valve in particular, a passage for the material to be sprayed can be created.
  • the actuation of the material valve can additionally or alternatively lead to a closing of the material valve, ie to the blocking and / or throttling of a passage for material to be sprayed.
  • the material valve can preferably be actuated, in particular opened, by means of air from the at least one valve outlet area. It is particularly preferred that it can be actuated, in particular opened, exclusively by means of air from the at least one valve outlet area.
  • the material valve can be actuated, in particular opened, by means of air which is supplied to the material valve and / or a component connected to the material valve from or via the at least one valve outlet area.
  • the material valve can be actuated, in particular opened, by means of air flowing out of the at least one valve outlet area.
  • the air can in particular flow into the material valve and / or into a component connected to the material valve in order to actuate the material valve, in particular to open it.
  • the actuation of the material valve can additionally or alternatively mean the closing of the material valve.
  • the amount of air flowing from the at least one valve inlet area into the at least one valve outlet area can be determined by the position of the actuating element; in particular, the amount of air flowing from the at least one valve inlet area into the at least one first valve outlet area can be within a first position section of the Actuating element and / or within a second position section of the actuating element, which is described in more detail below, can be determined by the position of the actuating element.
  • the force to be expended to actuate the actuating element by the user of the spray gun is significantly less than in the case of spray guns according to the prior art.
  • the spray gun according to the invention is preferably designed in such a way that the material valve can assume at least a first end position in which the material valve is closed and a second end position in which the material valve is completely open, in particular that there is at least a first end position in which the material valve is closed
  • the material valve is closed, a second end position in which the material valve is fully open and at least one intermediate position in which the material valve is partially open
  • the actuating element can assume at least a first end position in which the actuating element is not actuated and a second end position in which the actuating element is fully actuated, in particular that there is at least a first end position in which the actuating element is not actuated, a second end position in which the actuating element is fully actuated, and at least one intermediate position, in which the actuating element is partially actuated, can assume, the position of the actuating element determining the position of the material valve.
  • this can mean that when the actuating element is not actuated, the material valve is closed, that when the actuating element is partially actuated, the material valve is partially open and / or that when the actuating element is fully actuated, the material valve is fully open.
  • the spray gun is particularly preferably designed in such a way that the material valve can be adjusted continuously and / or in steps by means of the actuating element at least in one position section of the actuating element.
  • the state, in particular the actuation state, in particular the degree of actuation, in particular the position of the actuation element determines the state, in particular the actuation state, in particular the degree of actuation, in particular the position of the material valve and / or a closure part of the material valve.
  • actuating element changes continuously and the material valve changes in steps, or vice versa.
  • actuation of the actuating element can be understood in particular that the actuating element has covered 20%, 30%, 70% etc. of its actuation path, in particular its path between the non-actuated position and the fully actuated position.
  • actuation of the material valve can be understood in particular that a material needle closing the material valve, in particular the material nozzle, 20%, 30%, 70% etc.
  • the material valve can only be adjusted continuously and / or in steps by means of the actuating element in a specific position section of the actuating element.
  • the material valve cannot be adjusted by means of the actuating element in a first position section of the actuating element, which by means of a first end position of the actuating element in which the actuating element is not actuated and a first intermediate position of the actuating element in which the actuating element is partially actuated, whereas it can in a second position section of the actuating element, which is defined, in particular limited, continuously and / or in steps by a first intermediate position of the actuating element in which the actuating element is partially actuated and an end position of the actuating element in which the actuating element is fully actuated can be adjustable.
  • the second position section of the actuating element particularly preferably follows the first position section in the actuating direction.
  • the spray gun according to the invention is preferably designed in such a way that the position of the material valve at least in one position section of the actuating element changes continuously as a function of the change in the position of the actuating element, preferably changes essentially proportionally to the position of the actuating element, preferably in both actuating directions.
  • the fact that the position of the material valve changes continuously as a function of the change in the position of the actuating element means in the present case that the position of the material valve always changes when the position of the actuating element changes. This is preferably the case at least in one position section of the actuating element, preferably in the above-described second position section of the actuating element.
  • the fact that the position of the material valve changes constantly in both directions of actuation depending on the change in the position of the actuating element means that the position of the material valve changes constantly depending on the change in the position of the actuating element, both when the actuating element is actuated and when the actuating element is released.
  • letting go is generally the active or passive return of the To understand actuating element in the non-actuated position or in the non-actuated state. This is accompanied by the active or passive return of the material valve to the closed state.
  • the position of the material valve preferably changes essentially proportionally to the position of the actuating element. This can mean, for example, that a material needle that closes the material valve, in particular the material nozzle, extends 2 mm from the
  • Material outlet opening moves out when the actuator is moved 2 mm, moves 4 mm out of the material outlet opening when the actuator is moved 4 mm, moves 7 mm out of the material outlet opening when the
  • Actuator is moved 7 mm, and so on, which corresponds to a proportionality factor of 1.
  • the material needle moves 2 mm out of the material outlet opening when the actuating element is moved 4 mm, moves 3 mm out of the material outlet opening when the actuating element is moved 6 mm, moves 4 mm out of the material outlet opening moved out if that
  • Actuator is moved 3 mm, and so on, which corresponds to a proportionality factor of 0.5.
  • proportionality factor of 0.5.
  • larger or smaller proportionality factors are also conceivable.
  • the position of the material valve and / or the position of the actuating element can generally be understood here as well as a state, in particular an actuation state, in particular a degree of actuation of the material valve or the actuating element and / or a degree of actuation of a closure part of the material valve .
  • the material valve of the spray gun according to the invention particularly preferably has at least one material needle and a material outlet opening that can be closed by means of the material needle, the spray gun being designed in such a way that the material needle can be moved out of the material outlet opening by actuating the actuating element, in particular the trigger guard, with actuation of the actuating element , in particular of the trigger guard, a movement of the material needle over a second distance over a first distance, and wherein the second distance is dependent on the first distance, in particular where the second distance is equal to the first distance, in particular where the second distance is at least within one Position section of the actuating element depending on and / or equal to the first distance is.
  • the aforementioned position section is preferably the above-mentioned second position section.
  • the material valve preferably has at least one material needle and a material outlet opening that can be closed by means of the material needle, with a material valve actuating element configured as a piston on the material needle
  • Material valve actuating device is arranged, the piston being movably arranged within a material valve actuating cylinder, and the piston being designed such that it can be actuated by air, in particular by air from at least one valve outlet area, in particular that it can be actuated exclusively by air, in particular by air from at least a valve outlet area can be actuated.
  • the material valve actuation device can be designed as part of the material valve, or as a separate device.
  • Air in particular air from at least one valve outlet area, in particular from the valve outlet area described above, in particular air that is supplied to the piston from the valve outlet area, in particular air that flows from the valve outlet area to the piston, preferably exerts a force directly on the piston, whereupon the piston, together with the material needle on which it is arranged, moves in a direction facing away from the material outlet opening, whereby the material needle releases the material outlet opening and thus opens the material valve.
  • the piston can preferably delimit an air chamber, in particular it can be designed, so to speak, as a displaceable wall of an air chamber. Air is supplied to this air chamber, the pressure in the chamber increases and the air piston is moved.
  • the spray gun according to the invention preferably has at least one second air valve with at least one second valve inlet area and at least one second valve outlet area, wherein the at least one second air valve can be actuated by means of at least one actuating element, in particular by means of the actuating element through which the first air valve can be actuated.
  • the second air valve can be configured, for example, as a separate air valve, in particular connected in series with the first air valve described above.
  • the two air valves can share a common valve piston which moves, in particular opens and / or closes, the closure parts of the air valves when a common actuating element is actuated.
  • a first air valve and a second air valve can also be connected in parallel and / or can be actuated by means of different actuating elements.
  • the spray gun according to the invention preferably has at least one second air valve, in particular a second air valve arranged upstream of the first air valve at least one second valve outlet area, in particular at least one second valve outlet area arranged between the first air valve and the second air valve, in particular at least one in at least one air outlet opening of the spray gun, in particular in at least one atomizing air outlet opening and / or in at least one shaping air outlet opening and / or at least a transport air outlet opening, opening second valve outlet area.
  • the second air outlet area the above statements regarding the first air outlet area apply accordingly.
  • the second valve outlet area can also generally be an area, a section, a channel, a chamber or the like which is arranged downstream of the closure part of the second air valve to which air is supplied from the opened closure part of the second air valve, in particular flows into or into the air from the opened closure part of the second air valve.
  • the second air valve like the first air valve, preferably also has at least one valve inlet area, this second valve inlet area also generally being an area, a section, a channel, a chamber or the like which is arranged upstream of the closure part of the second air valve, in particular from which or from which air is supplied from the closure part of the second air valve, in particular from which or from which air flows to the closure part of the second air valve.
  • the first air valve and the second air valve particularly preferably share a common valve inlet area at least in some areas.
  • the second valve outlet area can preferably also be designed or used as a first valve inlet area, at least in some areas.
  • the following components are particularly preferably arranged one after the other in the downstream direction: common first and second valve inlet regions; Closing part of the second air valve; second valve outlet area, which is designed or serves at the same time as the end area of the first valve inlet area, at least in the initial area, and from which a continued second valve outlet area branches off; Closing part of the first air valve; second valve outlet area.
  • the second valve outlet area preferably opens into at least one air outlet opening of the spray gun, in particular into at least one atomizing air outlet opening and / or into at least one shaping air outlet opening and / or at least one transport air outlet opening.
  • the atomizing air outlet opening is an outlet opening, in particular in an air nozzle of the spray gun, which is designed such that a spray medium can be atomized by means of the air flowing out of it, the so-called atomizing air.
  • the shaping air outlet opening is an outlet opening, in particular in an air nozzle of the spray gun, which is designed such that by means of the air flowing out of it, the so-called shaping air, the shape of a spray jet can be changed.
  • the transport air outlet opening is an outlet opening, in particular in an air nozzle of the spray gun, which is designed in such a way that an atomized spray medium can be moved away from the spray gun in the direction of an object to be coated by means of the air flowing out of it, the so-called transport air is.
  • the outlet openings are particularly preferably made in the same air nozzle.
  • the second valve outlet area is preferably designed, at least in some areas, as an air duct or as an air duct arrangement composed of several, in particular branching, air ducts.
  • the spray gun according to the invention is preferably designed such that when the actuating element is actuated within a first position section of the actuating element, a first air valve between at least one first valve inlet area and at least one first valve outlet area is closed and at least one second air valve is opened between at least one second valve inlet area and at least one second valve outlet area and that when the actuating element is actuated within a second position section of the actuating element, the first air valve between the at least one first valve inlet area and the at least one first valve outlet area is open and the second air valve is open between the at least one second valve inlet area and the at least one second valve outlet area.
  • Said first position section of the actuating element is preferably the above-described first position section of the actuating element, which is defined by a first end position of the actuating element in which the actuating element is not actuated and a first intermediate position of the actuating element in which the actuating element is partially actuated, is defined, in particular limited.
  • Said second position section of the actuating element is preferably the above-described second position section of the actuating element, which is defined by a first intermediate position of the actuating element in which the actuating element is partially actuated and an end position of the actuating element in which the actuating element is fully actuated, is defined, in particular limited.
  • the first air valve is preferably the air valve first described above
  • the first valve inlet area is preferably the valve inlet area first described above
  • the at least one first valve outlet area is preferably the valve outlet area first described above
  • the second air valve is involved is preferably the second air valve described above, in the second
  • the valve inlet area is preferably the above-described second valve inlet area and the second valve outlet area is preferably the above-described second valve outlet area.
  • the second air valve between at least one second valve inlet area and at least one second valve outlet area opens first.
  • the air flowing from the at least one second valve inlet area through the opened second air valve into the at least one second valve outlet area can in particular serve as what is known as preliminary air.
  • the second valve outlet area preferably opens into at least one air outlet opening of the spray gun, in particular into at least one atomizing air outlet opening and / or into at least one shaping air outlet opening and / or at least one transport air outlet opening.
  • the spray gun only ejects air but no paint.
  • the pre-air flows in particular from the atomizing air outlet opening.
  • the pre-air prevents large, insufficiently atomized drops of paint from being hurled onto the object to be coated.
  • the first air valve Only in a second position section of the actuating element does the first air valve also open, whereupon air can flow from the at least one first valve inlet area through the opened first air valve into the at least one first valve outlet area.
  • the material valve can then be pneumatically actuated, in particular opened, by air from the first valve outlet area in particular.
  • the second air valve also remains open in the second position section of the actuating element, so that the material to be sprayed can be sucked out of the material outlet opening of the material valve and supplied to the atomizing air.
  • the first air valve and thus the material valve closes, while the second air valve remains open.
  • a first air valve is preferably integrated into a second air valve.
  • This can mean that a single component or a single arrangement can assume both the function of a first air valve, in particular the first air valve described above, and the function of a second air valve, in particular the second air valve described above.
  • a first air valve through at least part of the base body of the spray gun and a valve piston, in particular through at least one recess, in particular a valve piston which enlarges in the direction of at least one actuation element of the spray gun and which is arranged in particular between the actuation element and a closure part, in particular an air valve head, of a second air valve, and / or that a second air valve is formed by at least part of the base body the spray gun and a closure part, in particular an air valve head, is formed.
  • an air valve can have a valve piston and a closure part arranged thereon, in particular an air valve head, the valve piston being movably supported in the axial direction in a valve piston receiving channel, in particular in a valve piston receiving bore.
  • the valve piston receiving channel has approximately the same diameter as the valve piston and the valve piston is sealingly arranged in the valve piston receiving channel.
  • Upstream of the valve piston receiving channel is a short channel section with a slightly larger diameter than the diameter of the valve piston receiving channel. An upstream edge of this channel section can function as a valve seat for the closure part, in particular the air valve head.
  • This closure part, in particular this air valve head, and the valve seat formed by the main body of the spray gun can form a second air valve.
  • valve piston Between the closure part and the recess in the valve piston there is an area of the valve piston which does not have a recess and preferably rests against the wall of the valve piston receiving channel in a sealing manner.
  • This area of the valve piston can form a first air valve with the wall of the valve piston receiving channel, which is part of the main body of the spray gun.
  • sealing elements can be arranged between the valve piston and the wall of the valve piston receiving channel, in particular immediately upstream of the recess in the valve piston and in an area of the valve piston facing away from this sealing element.
  • the spray gun according to the invention and / or the material valve of the spray gun according to the invention preferably have a material valve actuating device, the material valve actuating device having at least one air inlet, an air outlet and an air chamber arranged in between, the air chamber being actuated on at least one side by at least one material valve actuating element, in particular for opening and / or for closing the material valve is limited, the spray gun and / or the material valve actuation device being designed such that the pressure in the air chamber is at least determined by the amount of air supplied to the air chamber via the air inlet, is determined in particular by the controllable amount of air supplied via the air inlet of the air chamber via the actuating element, in particular that the pressure in the air chamber is determined at least by the amount of air supplied to the air chamber via the air inlet and by at least one air outlet valve, in particular one arranged in the air outlet Air outlet valve, in particular a throttle valve and / or a pressure relief valve, is determined.
  • the ambient pressure essentially prevails in the air chamber of the material valve actuating device.
  • the actuating element is actuated, in particular in a second position section of the actuating element described above, air flows from the air inlet of the material valve actuating device into the air chamber of the material valve actuating device, whereby the pressure in the air chamber rises.
  • the material valve actuation element for actuating, in particular for opening and / or closing, the material valve, which delimits the air chamber on at least one side, is moved away from its unactuated end position as a result. This movement actuates the material valve, in particular opens it; in particular, a material needle can be moved out of the material outlet opening of a material nozzle.
  • the air outlet valve of the material valve actuation device is therefore designed in such a way that it lets air out of the air chamber from a certain pressure inside the chamber.
  • an air outlet valve in particular a throttle valve and / or a pressure relief valve, can be arranged in the air outlet for this purpose.
  • the pressure in the air chamber from which the air outlet lets air out of the air chamber is slightly more than the pressure by which the material valve actuating element is pushed into its fully actuated end position and is held.
  • the actuating element is fully actuated, in particular when the trigger guard is fully withdrawn, in which the maximum amount of air flows through the fully opened air valve, in particular the fully opened first air valve.
  • the amount of air is in particular an air volume flow. In this situation there is a balance between the air flowing into and out of the air chamber Air chamber of air flowing out, ie the volume flow of the air flowing into the air chamber is equal to the volume flow of the air flowing out of the air chamber.
  • the amount of air supplied via the air inlet of the air chamber and the air outlet valve, in particular the air outlet valve arranged in the air outlet, here in particular the throttle valve, are matched to one another in such a way that when the actuating element is only partially actuated, in particular when the actuating element is in an intermediate position within the second position section of the actuating element is located, the pressure in the air chamber is so high that the material valve actuating element is moved into an intermediate position between the unactuated end position and the fully actuated end position and is held there as long as the amount of air flowing from the air inlet of the material valve actuating device into the air chamber of the material valve actuating device, i.e. the volume flow, does not change.
  • this intermediate position there is also an equilibrium between the air flowing into the air chamber and the air flowing out of the air chamber, i.e. the volume flow of the air flowing into the air chamber is equal to the volume flow of the air flowing out of the air chamber.
  • the material valve actuating element is preferably designed as at least one piston which is movably arranged within a cylinder or has such a piston.
  • the air outlet valve in particular the throttle valve, is in the simplest case a constriction, in particular in the air outlet, in particular a throttle in front of which air accumulates and flows through in a throttled manner.
  • the air outlet can have both a throttle valve and a pressure relief valve.
  • a plurality of air outlets, each with at least one air outlet valve of the same type or of different types, can also be provided.
  • the spray gun and / or the material valve particularly preferably have a material valve actuating device, the material valve actuating device having at least one air inlet and one air outlet, the material valve actuating device being designed such that the air flowing out of the air inlet has a material valve actuating element for actuating, in particular opening, the material valve actuated, in particular exerts a force on the material valve actuating element in a first direction, the material valve actuating element furthermore having at least one material valve restoring device, in particular at least one spring element, in particular at least one compression spring and / or at least one tension spring, which is designed such that it is the Actuation of the material valve actuating element counteracts by the air, in particular that there is a force on the material valve actuating element in a exerts a second direction which differs from the first direction, in particular in a second direction opposite to the first direction.
  • the material valve actuation device, the at least one air inlet, the at least one air outlet and / or the material valve actuation element for actuating, in particular for opening, the material valve can be configured as described above and have the purposes and functions described above.
  • the present material valve actuating device has at least one material valve resetting device. This can in particular have at least one spring element, in particular at least spring element, in particular a compression spring and / or at least one tension spring, or the material valve return device can be designed as a spring element, in particular as a compression spring and / or as a tension spring.
  • the material valve resetting device is designed in such a way that it counteracts the actuation of the material valve actuating element by the air, in particular that it exerts a force on the material valve actuating element in a second direction that differs from the first direction, in particular in a second direction opposite to the first direction , exercises.
  • the more air flows into the air chamber the greater the pressure in the air chamber.
  • the greater the pressure in the air chamber the further the fluid valve actuator will move.
  • This pressure in the air chamber which acts on the material valve actuating element and moves it, is preferably counteracted by the material valve return device by applying a counterforce to the material valve actuating element.
  • the material valve resetting device preferably holds the material valve actuating element in its unactuated end position. If the actuating element is actuated, in particular in a second position section of the actuating element described above, air flows from the air inlet of the material valve actuating device into the air chamber of the material valve actuating device, whereby the pressure in the air chamber rises.
  • the material valve resetting device is no longer able to hold the material valve actuating element in the unactuated end position, whereupon the material valve actuating element moves, in particular in the direction of the material valve resetting device.
  • the material valve resetting device is particularly preferably designed in such a way that the force which the material valve resetting device exerts on the material valve actuating element is variable, in particular increases with a certain parameter.
  • the fluid valve Resetting device designed for example as a spring element, in particular as a compression spring or as a tension spring, the force increases with the spring travel, ie with the path by which the spring is pressed in.
  • a material valve resetting device designed as a compression spring is expediently arranged on the side of the material valve actuating element facing away from the air chamber
  • a material valve resetting device designed as a tension spring is expediently arranged on the side of the material valve actuating element facing the air chamber.
  • the amount of air supplied via the air inlet of the air chamber, the air outlet valve, in particular the air outlet valve arranged in the air outlet, here in particular the throttle valve, and the material valve return device are coordinated in such a way that when the actuating element is partially actuated, in particular when the actuating element is in an intermediate position is located within the second position section of the actuating element, the pressure in the air chamber is so great that the material valve actuating element is moved into an intermediate position between the unactuated end position and the fully actuated end position and is held there as long as the air inlet of the material valve actuating device enters the air chamber of the
  • Material valve actuation device does not change the amount of air flowing, i.e. the volume flow.
  • the force exerted on the material valve actuating element by the pressure in the air chamber is therefore just as great as the force in the opposite direction exerted by the material valve return device on the material valve actuating element.
  • In this intermediate position of the trigger guard and the material valve operating element there is also a balance between the air flowing into the air chamber and the air flowing out of the air chamber, i.e. the volume flow of the air flowing into the air chamber is equal to the volume flow of the air flowing out of the air chamber.
  • the spray gun, the material valve actuation device, the air outlet of the material valve actuation device and / or the air outlet valve of the air outlet are generally designed in such a way that at a certain pressure there is an equilibrium between the air flowing into the air chamber and the air flowing out of the air chamber, i.e. between the volume flow into the air chamber inflowing air and the volume flow of the air flowing out of the air chamber prevails.
  • the more the actuating element is actuated and the more air flows through it into the air chamber the greater the pressure at which this state of equilibrium is reached.
  • partial releasing generally means bringing the actuating element into a less strongly actuated position or into a less strongly actuated state and less air flows through the air inlet into the air chamber and the pressure at which the above-mentioned state of equilibrium is reached decreases. This also reduces the force acting on the material valve actuating element from the pressure in the air chamber.
  • the material valve restoring device exerting a force in the opposite direction on the material valve actuating element is thus able to move the material valve actuating element a little further in the direction of the air chamber, in particular a material valve restoring device designed as a spring element can relax a little, in particular rebound, and thus Move the fluid valve actuator a little further in the direction of the air chamber. This causes the material valve to close again a little. If the material valve actuating element is arranged on a material needle, this generally means that the material needle moves again a little in the direction of the material outlet opening of the material nozzle.
  • the spray gun can in particular be designed in such a way that only air through an open air valve, in particular from a valve inlet area into a valve outlet area, in particular that only air through the above-mentioned first air valve, in particular from the above-mentioned first valve inlet area into the above-mentioned first valve outlet area and / or to one, in particular the above-mentioned, material valve actuation device and / or to one, in particular the material valve actuation element described above, when the actuation element experiences a change in state, in particular a change in position, in particular if the actuation element is actuated more strongly.
  • the spray gun according to the invention has at least one first air valve and at least one second air valve, in particular a second air valve arranged upstream of the first air valve, with at least one second valve outlet area, in particular at least one between the first air valve and the second air valve arranged second valve outlet region.
  • the air of the first valve outlet area is preferably used to actuate the material valve, in particular it is fed to a material valve actuating element.
  • the air of the second valve outlet area is preferably fed to at least one air outlet opening of the spray gun, in particular at least one atomizing air outlet opening and / or at least one shaping air outlet opening and / or at least one transport air outlet opening.
  • the second valve outlet area can preferably conduct a significantly larger amount of air than the first air outlet area.
  • the air takes the path of least resistance, i.e. if the first air valve and the second air valve are open, it only flows into the first valve outlet area until in the first valve outlet area and / or in an air chamber connected to the first valve outlet area, in particular the air chamber described above with the material valve actuation element, a certain air pressure is reached. Once this pressure has been reached, the air only flows through the second valve outlet area. In the first valve outlet area or in the air chamber connected to it, the air is, so to speak, and the constant air pressure prevailing there presses the material valve actuating element with constant force.
  • a material valve resetting device in particular the material valve resetting device described above, exerts a counterforce on the material valve actuating element so that the material valve actuating element remains positionally stable.
  • the material valve and / or a closure part of the material valve remain in a certain position, a certain position and / or in a certain state, in particular an actuation state, in particular a degree of actuation. Only when the actuating element is actuated further, ie more strongly, i.e. the first air valve is opened further, in particular the flow cross section is increased, does air flow again through the first air valve into the first valve outlet area, whereby the pressure in the first valve outlet area or in the one with it associated air chamber increases, thereby increasing the force on the fluid valve actuator.
  • the material valve actuating element moves, in particular the material valve is actuated more strongly, in particular opened further. However, a state is reached again very quickly in which there is a certain air pressure in the first valve outlet area and / or in an air chamber connected to the first valve outlet area, in particular the above-described air chamber with the material valve actuating element, which causes the air to flow only through the second To flow valve outlet area.
  • partial releasing also generally means bringing the actuating element into a less strongly actuated position or into a less strongly actuated state a lower pressure on the first valve outlet area and on the actuating element than before the partial release. This also reduces the pressure on that
  • Fluid valve actuator acting force The material valve restoring device exerting a force in the opposite direction on the material valve actuating element is thus able to move the material valve actuating element a little further in the direction of the air chamber, in particular a material valve restoring device designed as a spring element can relax a little, in particular rebound, and thus Move the fluid valve actuator a little further in the direction of the air chamber. This causes the material valve to close again a little. Is this
  • the material valve actuating element is arranged on a material needle, this generally means that the material needle moves again a little in the direction of the material outlet opening of the material nozzle.
  • the spray gun is preferably designed in such a way that it functions by means of a mixture of the two modes of operation described above, i.e. both on a balance between air flowing into the air chamber and air flowing out of the air chamber and on the path of least resistance.
  • the second air valve is preferably open to such an extent during the entire actuation path of the first air valve that the maximum possible amount of air can always flow through the second air valve. This means that the volume flow flowing through the second air valve is not restricted by the second air valve during the entire actuation path of the first air valve, but possibly by the above-mentioned air outlet openings of the spray gun, to which the air is supplied from the second air valve or the second valve outlet area.
  • the material valve resetting device can therefore be used in all modes of operation of the spray gun according to the invention, ie both in the mode of operation based on a balance between air flowing into the air chamber and air flowing out of the air chamber and in the mode of operation based on the path of least resistance and also in a Mixture of the two modes of operation, in particular to reset the material valve from a second end position in which the material valve is fully open, into a first end position in which the material valve is closed, and / or to reset the material valve from at least one intermediate position in which the material valve is partially open, in a first end position in which the material valve is closed, and / or designed to hold the material valve in a first end position in which the material valve is closed.
  • the material valve return device and the air outlet downstream of the actuating element must be coordinated with one another.
  • the spray gun according to the invention is designed in such a way that a material valve of the spray gun according to the invention is opened pneumatically, i.e. by air, and closed mechanically, in particular by a spring force.
  • a material valve of the spray gun according to the invention is opened pneumatically, i.e. by air, and closed mechanically, in particular by a spring force.
  • the configurations described above make it possible for the position of the material valve to change continuously at least in one position section of the actuating element as a function of the change in the position of the actuating element, namely in both actuating directions of the actuating element, that is, both when actuating and when partially and / or letting go completely.
  • the spray gun according to the invention is particularly preferably designed in such a way that the air flowing out of at least one valve outlet area and used to actuate the material valve, in particular the air flowing out of an air outlet of a material valve actuation device, at least one air outlet opening of the spray gun, in particular at least one atomizing air outlet opening and / or at least a shaped air outlet opening and / or at least one transport air outlet opening will.
  • the air outlet of a material valve actuation device is particularly preferably the air outlet of the material valve actuation device described above.
  • the air flowing out of the air outlet is fed to at least one air outlet opening of the pointed gun and is therefore not lost, but can be used sensibly.
  • the air can be supplied to at least one atomizing air outlet opening and / or at least one shaped air outlet opening and / or at least one transport air outlet opening, as described above.
  • the spray gun according to the invention preferably has at least one actuating element return device, in particular at least one spring element, in particular at least one compression spring and / or at least one tension spring.
  • the actuating element resetting device is preferably designed in such a way that it holds an actuating element in an unactuated end position and, when the actuating element is released, moves the actuating element back into its unactuated end position after actuation.
  • the force generated by the actuating element restoring device can be relatively small, so that the user of the spray gun only has to actuate the actuating element against a relatively small restoring force.
  • the spray gun is preferably designed in such a way that the material valve is reset by means of the material valve resetting device, in that air can escape from an air chamber via the air outlet with a decrease in the air pressure in the air chamber.
  • An air inlet arranged upstream of the actuating element, in particular the aforementioned air inlet to an air chamber, and / or an air outlet arranged downstream of the actuating element, in particular the aforementioned air outlet from an air chamber, can each have a fixed and / or a variable valve, in particular an air inlet and / or air outlet each have a regulated valve.
  • the spray gun according to the invention particularly preferably has at least one base body, at least one air nozzle with at least one air outlet opening, in particular at least one atomizing air outlet opening for discharging air for atomizing a material to be sprayed, at least one shaping air outlet opening for discharging air to change the shape of a spray jet , and / or at least one transport air outlet opening for the outlet of air for transporting an atomized spray medium, at least one actuating element, in particular a trigger guard, at least one air valve, in particular at least one air valve coupled to the actuating element, in particular one via a valve piston with the Actuating element, in particular air valve coupled, in particular spring-loaded, to the trigger guard, at least one spray gun air inlet, at least one material needle and at least one material nozzle with at least one material outlet opening, the spray gun being designed in such a way that when the actuating element is actuated up to a first degree of actuation the air valve opens so that air, in particular compressed air, from the spray gun
  • Material valve actuation device flows, the amount of air flowing into the material valve actuation device increasing with increasing degree of actuation of the actuating element, the air flowing into the material valve actuation device exerting a force in a direction facing away from the material nozzle on the material needle arranged in the material valve actuation device and / or on a part arranged on the material needle , in particular on the material valve actuating element designed as a piston, the force exerted on the material needle and / or on the part arranged on the material needle increasing with the degree of actuation of the actuating element, whereby the material needle is moved over a second distance in a direction facing away from the material nozzle and is thereby moved out of the material outlet opening of the material nozzle over this second distance, the second distance being dependent on a first distance which the actuating element ent is actuated upon actuation from the first degree of actuation, and the air flows at least when a maximum pressure within the material valve actuation device is reached from the material valve actuation device
  • the spray gun according to the invention can have at least one continuous valve, which can be designed in particular as a proportional valve, control valve and / or as a servo valve.
  • the volume flow of air should be adjustable by means of at least one valve.
  • an above-mentioned air valve, in particular the first air valve and / or the second air valve, can be configured in this way.
  • the spray gun according to the invention can have at least one actuation area and at least one trigger area, in particular at least one of the at least one Actuation area separable trigger area, wherein the at least one actuation area has at least one actuation element and / or the at least one trigger area has at least one material valve, in particular for the outlet of material to be sprayed, wherein the at least one actuation area and the at least one trigger area by means of, for example, as Air duct, hose and / or connecting element configured as a tube are connected to one another and / or can be connected. This can make cleaning the spray gun easier, for example.
  • the spray gun according to the invention can comprise at least one device which supports or initiates a breakaway, in particular a breakaway, of the material needle, in particular from its inoperative position, i.e. when the material outlet opening of the material nozzle or the material valve is closed by the material needle.
  • This can be advantageous, for example, if residues of a sprayed material have remained in the material outlet opening after the spray gun has been used and have dried up. This can lead to the material needle sticking in the material outlet opening. A relatively large force is required to loosen this bond, which force may not be able to be applied by the pneumatic means described above.
  • the functional reliability of the fuel gun according to the invention can be increased by slightly “bumping into” the material needle by at least one mechanical device for breaking the material needle out of its non-actuated position.
  • the at least one material valve can be viewed as pneumatically actuatable, in particular openable, in particular exclusively pneumatically actuated, in particular openable, since only the mentioned first impact of the material needle takes place mechanically, the further actuation, however, pneumatically.
  • the material needle is always broken away mechanically or by mechanical means, in particular by the at least one mechanical device for breaking away the material needle, in particular from its non-actuated position.
  • the pneumatic means described above cannot apply the force required for breaking loose.
  • the actuating element, in particular the trigger guard, or a part thereof engages a driver on the paint needle when the actuating element has reached a certain degree of actuation without the material needle having moved out of the material outlet opening.
  • the pneumatic means described above have been able to apply the force required to break the material needle out of its inoperative position and if the material needle has moved out of the material outlet opening, the mechanical device does not come into play, in particular it takes effect Actuating element or part of it not on a driver on the paint needle.
  • This mode of operation can be achieved in particular by appropriate positioning of the driver on the material needle in the axial direction.
  • the above-described or at least one further mechanical device for breaking loose, in particular the material needle can also support or initiate breaking away of the material needle from its fully actuated position, ie when the material needle has moved completely out of the material outlet opening of the material nozzle or the material valve . This can be advantageous in the event that the paint needle has stuck in its fully actuated position, in particular in its rear end position.
  • the above-described or at least one further mechanical device for breaking loose, in particular the material needle can also support or initiate breaking away of the material needle from its partially actuated position, i.e. when the material needle has partially moved out of the material outlet opening of the material nozzle or the material valve. This can be advantageous in the event that the paint needle has become stuck during its movement from the front to the rear end position or back.
  • Fig. 1 is a perspective view of an embodiment of a spray gun according to the invention
  • FIG. 2 shows a representation of the schematic functional principle of an exemplary embodiment of a spray gun according to the invention with a non-actuated actuating element
  • FIG. 3 shows an illustration of the schematic functional principle of an exemplary embodiment of a spray gun according to the invention with a partially actuated actuating element
  • FIG. 4 shows a representation of the schematic functional principle of an exemplary embodiment of a spray gun according to the invention with a fully actuated actuating element.
  • FIG. 1 shows a perspective view of an exemplary embodiment of a spray gun 1 according to the invention, with a base body 3, at the lower end of which a spray gun air inlet 4 is arranged.
  • the spray gun 1 also has an air nozzle 5, which in the present case comprises an air cap 9 which is screwed to the base body 3 of the spray gun 1 by means of an air nozzle ring 11.
  • the air cap 9 has two horns 13a, 13b each with two shaped air outlet openings 20.
  • it has a central opening which, in the present case, together with a material nozzle screwed into the base body 3, forms an atomizing air outlet opening 15 configured as an annular gap.
  • a material quantity regulator is arranged in the spray gun 1 and can be actuated via a rotary knob 19 for regulating the quantity of material.
  • a rear stop for a paint needle can be defined via the material volume control, ie the material volume control can be used to set how far the paint needle can emerge from the material outlet opening of the material nozzle when the actuating element 18, in the present case designed as a trigger, is fully actuated. This defines the maximum flow cross section for the material flowing out of the material outlet opening of the material nozzle and thus the amount of material sprayed by the spray gun 1.
  • the spray gun 1 also has a device by which the amount of air, which is not visible in FIG flows, is adjustable.
  • a so-called air micrometer can be used, which in the present case can be actuated by means of an air micrometer rotary knob 21.
  • the air micrometer can, for example, be designed as a sleeve which has an opening in its wall, the degree of overlap of which with the mouth of the air inlet duct arrangement can be adjusted. In this way, the flow cross-section through which the air can flow from the grip area of the spray gun 1 into an upper part of the gun body 3 can be set.
  • the present exemplary embodiment of a spray gun 1 has in its interior a first air outlet channel arrangement, not visible in FIG. 1, and a second air outlet channel arrangement, likewise not visible in FIG. 1.
  • the first air outlet duct arrangement can in particular be an air outlet duct arrangement for guiding air for atomizing a material to be sprayed.
  • This air outlet channel arrangement can be referred to as an atomizing air channel arrangement or an atomizing air channel.
  • the air conducted by it or it can flow out of the atomizing air outlet opening 15 formed by the central opening and the material nozzle screwed into the base body 3 and designed as an annular gap and can be referred to as atomizing air.
  • the second air outlet channel arrangement can in particular be an air outlet channel arrangement for guiding air to change the shape of a spray jet.
  • the air outlet duct arrangement can be referred to as a shaped air duct arrangement or as a shaped air duct.
  • the air guided by it or it can flow out of the shaped air outlet openings 20 of the horns 13a, 13b and can be referred to as shaped air.
  • Fig. 1 is a round broad jet rotary knob 23 for actuating a control device for distributing the air flowing from the air inlet duct arrangement between the atomizing air duct arrangement and the shaping air duct arrangement.
  • the spray gun 1 also has a device having a display 29 for inputting and / or setting and / or recording and / or determining and / or displaying the air pressure prevailing in an air chamber during operation of the spray gun 1.
  • a device for determining and displaying the air pressure prevailing in an air chamber during operation of the spray gun which device also has a device for detecting an air pressure, in particular a pressure sensor.
  • FIGS. 2, 3 and 4 each show a representation of the schematic functional principle of an exemplary embodiment of a spray gun 1 according to the invention.
  • the spray gun 1 has an actuating element 18 designed as a trigger guard, by means of which a valve piston 78 can be actuated, i.e. in the present case it is movably supported in the axial direction in a valve piston receiving channel 79 in the base body 3 of the spray gun 1.
  • the valve piston receiving channel 79 has approximately the same diameter as the valve piston 78 and the valve piston 78 is arranged in a sealing manner in the valve piston receiving channel 79.
  • the valve piston 78 in the present case has a recess 90 which, in the exemplary embodiment shown, enlarges, in particular deepens, in the direction of the actuating element 18.
  • Adjacent to the recess 90 in the valve piston 78 is a region of the valve piston 78 which has no recess and which preferably rests against the wall of the valve piston receiving channel 79 in a sealing manner.
  • This area of the valve piston 78 forms with the wall of the valve piston receiving channel 79, which is part of the base body 3 of the spray gun 1, a first air valve 80.
  • This channel section can be designed as at least part of a first valve inlet region 62.
  • An upstream edge of the first valve inlet region 62 can be configured as a valve seat for the closure part, in particular the air valve head, of a second air valve 82.
  • sealing elements can be used be arranged between the valve piston 78 and the wall of the valve piston receiving channel 79, in particular immediately upstream of the recess 90 in the valve piston 78 and in a region of the valve piston 78 facing away from this sealing element.
  • the material valve 96 having a material nozzle 40.
  • the material nozzle 40 or the material valve 96 has a material outlet opening 28 and a material needle 42.
  • a material valve actuation element 43 designed as a piston for actuating, in particular for opening and / or closing, the material valve 96 is fixedly arranged, in particular immovable in the axial direction.
  • the material valve actuating element 43 is mounted so as to be movable in the axial direction in a material valve actuating cylinder 44.
  • a material valve resetting device 48 designed as a compression spring rests on the side of the material valve actuating element 43 facing away from the material nozzle 40.
  • the material valve actuating element 43 On the side of the material valve actuating element 43 facing away from the material valve resetting device 48 there is an air chamber 50 which is supplied with air via an air inlet 98.
  • the material valve 96 or the air chamber 50 furthermore has an air outlet 99, from which air from the air chamber 50 can flow out.
  • the arrangement of material valve actuating element 43, material valve resetting device 48, air chamber 50, air inlet 98 and air outlet 99 can be designed as a material valve actuating device 49, which is preferably arranged inside the base body 3 of the spray gun 1, but can also be arranged outside.
  • the air inlet 98 is connected to a first valve outlet region 92 via a connecting element 8.
  • the first valve outlet region 92 and the air inlet 98 can, however, also directly adjoin one another and / or be designed as a common channel.
  • the present exemplary embodiment of a spray gun 1 according to the invention furthermore has a second valve outlet region 93 and a spray gun air inlet 4.
  • the second valve outlet area 93 and the first valve inlet area 62 are in the present case designed at least in some areas as a common channel.
  • the spray gun 1 according to the invention can have an actuating element resetting device 94, which can in particular be designed as one or more compression springs and which, when released, return the actuating element 18 to its unactuated end position and / or hold it there.
  • FIG. 2 shows a schematic functional principle of an exemplary embodiment of a spray gun 1 according to the invention with a non-actuated actuating element 18, ie the actuating element 18 is in a first end position.
  • Both the first air valve 80 as well as the second air valve 82 are closed. This means that air, in particular compressed air, which flows into the spray gun air inlet 4 of the spray gun 1, from the valve inlet area, in particular from the second valve inlet area 64 of the second air valve 82, does not pass through the second air valve 82 and thus also not to the first air valve 80 can flow.
  • the material valve 96 is not actuated, ie in the present case that the material outlet opening 28 of the material nozzle 40 or of the material valve 96 is closed by the material needle 42.
  • a medium to be sprayed which is fed to the material nozzle 40 by means of a material feed (not shown here), cannot leave the material outlet opening 28. In this state shown in FIG. 2, no air flows out of the air outlet openings of the air nozzle 5 of the spray gun 1 shown in FIG. 1 either.
  • FIG. 3 shows a schematic functional principle of an exemplary embodiment of a spray gun 1 according to the invention with a partially actuated actuating element 18.
  • the actuating element shown in dashed lines represents the position of the actuating element 18 shown in FIG. 2 in the unactuated position.
  • the first end position of the actuating element 18 shown in FIG. The actuating element 18, in which the actuating element 18 is partially actuated, define, in particular limit, a first position section A of the actuating element 18.
  • the second air valve 82 opens, whereupon air from the spray gun Air inlet 4 of the spray gun 1 can flow into the second valve inlet area 64 of the second air valve 82, through the second air valve 82 and out of the second valve outlet area 93.
  • the air from the second valve outlet area 93 is preferably supplied to air outlet openings in the air nozzle 5 shown in FIG
  • the air flowing through the atomizing air outlet opening 15 serves as the above-described preliminary air before it can fulfill its purpose as atomizing air after the material valve 96 or the material nozzle 40 has been actuated, in particular opened, and the material to be sprayed can exit from the material outlet opening 28.
  • the first air valve 80 is still just closed, so that no air from the first valve inlet area 62, which, as already mentioned, is also part of the second valve outlet area 93, through the first air valve 80 into the first valve outlet area 92 can flow.
  • the material valve 96 is still not activated, ie in the present case the material outlet opening 28 of the material nozzle 40 or of the material valve 96 is still is closed by the material needle 42.
  • FIG. 4 shows a representation of the schematic functional principle of an exemplary embodiment of a spray gun 1 according to the invention with a fully actuated actuating element 18.
  • the actuating element shown in dashed lines represents the position of the actuating element 18 in the partially actuated position shown in FIG.
  • the actuated position of the actuating element 18 and the end position of the actuating element 18 shown in FIG. 4, in which the actuating element 18 is fully actuated, define, in particular limit, a second position section B of the actuating element 18 second air valve 82 and the first air valve 80 are opened.
  • the air outlet 99 of the air chamber preferably has a throttle, in particular a throttle valve. The air can therefore only escape very slowly, if at all, from the air chamber, which is why the pressure within the air chamber 50 rises.
  • This pressure exerts a force on the material valve actuating element 43 which moves the material valve actuating element 43 backwards in the direction facing away from the material nozzle 40 counter to the force exerted by the material valve return device 48 on the material valve actuating element 43.
  • the material valve actuating element 43 has reached its fully actuated position, ie it is in contact with a rear stop.
  • This stop or another stop against which the material needle 42 itself strikes can be adjustable in all embodiments, in particular by means of a material quantity regulator which can be actuated via a material quantity regulating knob 19 shown in FIG.
  • the material valve actuating element 43 Since the material valve actuating element 43 is fixedly arranged, in particular immovable in the axial direction, on the material needle 42, the material needle 42 moves with the material valve actuating element 43 backwards and out of the material outlet opening 28. In the situation shown in FIG. 4, the actuating element 18 is fully actuated, the material valve actuating element 43 is also fully actuated and the material valve 96 or the material nozzle 40 are fully open. In this situation, the maximum possible amount of material to be sprayed flows out of the material outlet opening 28 or the maximum possible amount of material to be sprayed is exerted from the material outlet opening 28 by the atomizing air or the negative pressure generated by the atomizing air at the front end of the material nozzle 40 sucked out.
  • the spray gun 1 according to the invention is preferably designed in all embodiments in such a way that, under otherwise identical conditions, in the situation shown in FIG the second valve outlet region 93 flows as in the situation shown in FIG. 4, in which the actuating element 18 is fully actuated. Even when the actuating element 18 is actuated within the second position section B of the actuating element 18, this amount of air, in particular this volume flow, does not change. As already described above, pressure fluctuations that could negatively affect the painting result can be avoided in this way.
  • the material valve 96 can therefore be actuated pneumatically, in particular opened. In the present case it can even be actuated exclusively pneumatically, in particular it can be opened, i.e.
  • the actuating element mostly engages a driver arranged on a material needle, whereby the material needle is pulled backwards out of the material outlet opening of a material nozzle and the material valve is thus actuated mechanically.
  • the material valve 96 can be actuated, in particular opened, by means of air from at least one valve outlet area, here the first valve outlet area 92, specifically exclusively by means of air from the first valve outlet area 92.
  • the actuating element 18 and the material valve 96 do not touch. At least in the second position section B, the position of the actuating element 18 determines the position, or the state, of the material valve 96.
  • the spray gun 1 according to the invention is designed in such a way that the material valve 96 can be adjusted by means of the actuating element 18 at least in one position section of the actuating element 18, here in the second position section B, preferably steplessly, but possibly also in steps.
  • the position, or the state, of the material valve 96 changes at least in one position section of the actuating element 18, here in the second position section B, continuously depending on the change in the position of the actuating element 18, preferably essentially proportional to the position of the actuating element 18, preferably in both directions of actuation, ie both when actuating and releasing in the sense described above.
  • the first air valve 80 is opened to some extent, so that air flows from the spray gun air inlet 4 of the spray gun 1 into the second valve inlet region 64, through the first air valve 82.
  • the majority of the air flows out of the second valve outlet area 93, but a smaller part of the air flows through the slightly opened first air valve 80 into the first valve outlet area 92 and from there into the air chamber 50.
  • the air outlet 99 or the throttle of the air outlet 99, allows in approximately as much air can flow out of the air chamber 50 through the air outlet 99 as flows into the air chamber 50 through the first air valve 80 and the air inlet 98, so that the pressure in the air chamber 50 is kept constant at the relatively low level. Only when that Actuating element 18 is actuated a little further, i.e.
  • the first air valve 80 is opened a little further, a little more air flows into the air chamber 50, whereby the pressure in the air chamber 50 increases and the material valve actuating element 43 is pushed a little further back and the material needle 42 a little further is moved out of the material outlet opening 28, whereupon a little more material can leave the material outlet opening 28.
  • the actuating element 18 is brought from a slightly actuated position within the second position section B into a more easily actuated position within the second position section B, if the actuation element 18 is released slightly, less air flows through the first air valve 80 and the air inlet 98 into the Air chamber 50. The pressure in the air chamber 50 drops and the material valve resetting device 48 pushes the material valve actuating element 43 again somewhat further in the direction of the material nozzle 40.
  • the first air valve 80 closes in front of the second air valve 82, whereupon air no longer flows through the first air valve 80 into the air chamber 50.
  • the material valve resetting device 48 and the material valve actuating element 43 push the air still in the chamber 50 out of the air outlet 99 of the air chamber 50 until the air chamber 50 is approximately at ambient pressure again and the material valve 96 is not actuated.
  • the area below the connecting element 8 can be viewed as an actuation area 95 and / or designed as such.
  • the actuation area 95 can be separable from a release area, which can be viewed here as a material valve 96 or which can have the material valve 96.

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Nozzles (AREA)

Abstract

L'invention concerne un pistolet de pulvérisation (1), en particulier un pistolet de pulvérisation de peinture par atomisation d'air comprimé, en particulier un pistolet de pulvérisation de peinture par atomisation d'air comprimé portatif, qui comporte au moins une soupape d'air (80, 82), en particulier une soupape d'air (80, 82) pouvant être actionnée au moyen d'au moins un élément d'actionnement (18), en particulier au moyen d'au moins un déclencheur, présentant au moins une zone d'entrée de soupape (62, 64) et au moins une zone de sortie de soupape (92, 93), le pistolet de pulvérisation (1) comprenant au moins une soupape de matière (96), en particulier pour une matière à pulvériser, et ladite soupape de matière (96) étant conçue de manière à pouvoir être actionnée pneumatiquement, en particulier ouverte, en particulier exclusivement actionnée pneumatiquement, en particulier ouverte, en particulier pouvant être actionnée, en particulier ouverte, au moyen de l'air provenant de ladite zone de sortie de soupape (92, 93), en particulier pouvant être actionnée, en particulier ouverte, exclusivement au moyen de l'air provenant de ladite zone de sortie de soupape (92, 93). Dans le mode de réalisation selon l'invention, la force à exercer pour actionner l'élément d'actionnement par l'utilisateur du pistolet de pulvérisation est considérablement inférieure à celle des pistolets de pulvérisation selon l'état de la technique, ce qui assure un fonctionnement sans effort.
EP21706572.1A 2020-03-06 2021-02-18 Pistolet de pulvérisation, en particulier pistolet de pulvérisation de peinture par atomisation d'air comprimé, en particulier pistolet de pulvérisation de peinture par atomisation d'air comprimé portatif Pending EP4114578A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020106172.2A DE102020106172A1 (de) 2020-03-06 2020-03-06 Spritzpistole, insbesondere druckluftzerstäubende Farbspritzpistole, insbesondere handgeführte druckluftzerstäubende Farbspritzpistole
PCT/EP2021/054059 WO2021175611A1 (fr) 2020-03-06 2021-02-18 Pistolet de pulvérisation, en particulier pistolet de pulvérisation de peinture par atomisation d'air comprimé, en particulier pistolet de pulvérisation de peinture par atomisation d'air comprimé portatif

Publications (1)

Publication Number Publication Date
EP4114578A1 true EP4114578A1 (fr) 2023-01-11

Family

ID=74668869

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21706572.1A Pending EP4114578A1 (fr) 2020-03-06 2021-02-18 Pistolet de pulvérisation, en particulier pistolet de pulvérisation de peinture par atomisation d'air comprimé, en particulier pistolet de pulvérisation de peinture par atomisation d'air comprimé portatif

Country Status (5)

Country Link
US (1) US20230087047A1 (fr)
EP (1) EP4114578A1 (fr)
CN (1) CN115515721A (fr)
DE (1) DE102020106172A1 (fr)
WO (1) WO2021175611A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE259621C (de) 1912-09-20 1913-05-09 Leipiziger Tangier-Manier Einrichtung zum Steuern eines Preßluftspritzapparates , bei dem die Nadelstange an einem Kolben Sitzt.
GB0122208D0 (en) * 2001-09-14 2001-11-07 Vincent Ltd G Spray gun
JP5270842B2 (ja) 2007-01-31 2013-08-21 アネスト岩田株式会社 塗装用スプレーガン
WO2015061144A1 (fr) 2013-10-22 2015-04-30 Polyurethane Machinery Corporation Pistolet de pulvérisation
EP3870376B1 (fr) * 2018-10-26 2024-03-20 Graco Minnesota Inc. Chambre de mélange pour un pulvérisateur à constituants multiples

Also Published As

Publication number Publication date
DE102020106172A1 (de) 2021-09-09
CN115515721A (zh) 2022-12-23
US20230087047A1 (en) 2023-03-23
WO2021175611A1 (fr) 2021-09-10

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