EP4114577A1

EP4114577A1 - Spray gun, pressure measuring device for a spray gun and method for developing a spray gun

Info

Publication number: EP4114577A1
Application number: EP21706923.6A
Authority: EP
Inventors: Norbert Maier
Original assignee: SATA GmbH and Co KG
Current assignee: SATA GmbH and Co KG
Priority date: 2020-03-06
Filing date: 2021-02-18
Publication date: 2023-01-11
Also published as: CN115485073A; WO2021175612A1; DE102020106173A1; US20230107860A1

Abstract

The invention relates to a spray gun (1), in particular a pressurised air atomisation paint spray gun, in particular a hand-held pressurised air atomisation paint spray gun, comprising at least one material nozzle (40) for discharging a material to be sprayed, at least one air nozzle (5) for outputting air, in particular air for atomising a material to be sprayed, air for changing the shape of a spray jet, and/or air for transporting an atomised spraying medium, and at least one air chamber (80, 82), in particular an air chamber (80, 82) adjoining the air nozzle (5) or at least one air outlet opening of the air nozzle (5) in the upstream direction, for supplying the air nozzle with air, characterised in that the spray gun (1) also has at least one device for inputting and/or adjusting and/or detecting and/or determining and/or displaying the air pressure in the air chamber (80, 82) during operation of the spray gun (1). The invention also relates to a pressure measuring device for a spray gun (1) and a method for developing a spray gun (1).

Description

Spray gun, pressure measuring device for a spray gun and method for

Designing a spray gun

The invention relates to a spray gun, in particular a paint spray gun, in particular hand-held compressed air atomizing paint spray gun, according to the preamble of claim 1, a pressure measuring device for a spray gun, in particular for a hand-guided compressed air atomizing paint spray gun, according to the preamble of claim 11, and a method for designing a spray gun, in particular a hand-held, compressed air atomizing paint spray gun according to the preamble of claim 15.

Spray guns, especially paint spray guns, use different printing processes. Conventional spray guns work with relatively high spray pressures of several bar. With so-called 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.

According to the prior art, a spray gun, in particular a paint spray gun, in particular a paint spray gun that atomizes compressed air, has a paint nozzle on its head which is screwed into the gun body. At its front end, the paint nozzle often has a hollow cylindrical cone, from the front mouth of which the material to be sprayed emerges when the spray gun is in operation. The paint nozzle can, however, also have a conical shape 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 larger than the outside diameter of the paint nozzle cone or the outside diameter of the front end of a conical paint nozzle. The central opening of the air cap and the cone or the front end of the paint nozzle together form an annular gap. The so-called atomizing air emerges from this annular gap, which creates a negative pressure at the end face of the paint nozzle in the nozzle arrangement described above, as a result of which the material to be sprayed out the paint nozzle is sucked out. The material to be atomized is fed into the atomizing air and torn into threads and ribbons. Due to their hydrodynamic instability, the interaction between the fast-flowing compressed air and the ambient air and due to aerodynamic disturbances, these threads and ribbons disintegrate into 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. As a rule, 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. As a result, 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. In addition to deforming the spray jet, the purpose of the horn air is to further atomize the spray jet.

In the gun body, ie the main body of the spray gun, 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. For this purpose, 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.

The air pressure in the spray gun, in particular in the air chamber, which is often formed from an air cap and material nozzle, to supply the above-mentioned annular gap to the outlet of atomizing air, but also in the horn air supply channels or the horn air holes in the horns, is one of the most decisive criteria for a high-quality painting result , especially for the quality of the atomization of the material to be sprayed. For this reason, DE 10135104 C1 suggests providing a pressure detection and pressure display device 45 in a paint spray gun, the paint spray gun having a paint nozzle 11 arranged on a gun body 1, an air nozzle 21 arranged around the paint nozzle 11, and a piston bore 33 in the gun body 1 arranged compressed air valve 31, 32 for controlling the compressed air supply to the air nozzle 21, a compressed air bore 36 running through a handle 2 of the gun body 1 to the piston bore 33 and a pressure detection and pressure display device 45 arranged in the handle 2, with a compressed air bore 36 spaced from its inner wall Tube 38 is arranged, which in the interior forms a channel 53 for the supply of compressed air to a part of the piston bore 33 arranged upstream of the compressed air valve 31, 32 and delimits an intermediate space 39 between its outer side and the inner wall of the compressed air bore 36, which via a first connector application channel 50 is connected to a downstream of the compressed air valve 31, 32 arranged pressure chamber 28 and via a second connecting channel 52 to a pressure measuring chamber 46 assigned to the pressure detection and pressure display device 45 in the handle 2. In contrast to the previous state of the art, this solution should not allow a mere measurement of the inlet pressure, but rather a measurement of the injection pressure.

DE 10 2009 020 194 A1 discloses a spray gun with a gun body 1, a nozzle arrangement 9 arranged on the gun body 1, a compressed air supply channel 22, 23 arranged in the gun body 1 with a valve arrangement 17 for controlling the compressed air supply to the nozzle arrangement 9, a device 31, 33, 37, 42, 40 for regulating the compressed air supply, and a pressure measuring device 35 for detecting and displaying the pressure in the compressed air supply channel 22, which is characterized in that the pressure measuring device 35 is detachable on the device 31, 33, 37, 42, 40 for regulating the compressed air supply is attached. This should make it possible that the pressure measuring device is not soiled or damaged during cleaning work and that a battery change, which is necessary when using a digital manometer, can be carried out easily.

The solutions have proven themselves over many years. Nevertheless, only an approximate measurement of the actual injection pressure is possible using the solutions.

A first object of the present invention is therefore to provide a spray gun, in particular a compressed air atomizing paint spray gun, in particular a hand-held compressed air atomizing paint spray gun, in which the actual spray pressure can be determined more precisely than in the prior art. Another object of the present invention is to provide a pressure measuring device for a spray gun, in particular for a hand-held compressed air atomizing paint spray gun, by means of which the actual spray pressure of a spray gun can be determined more precisely than in the prior art.

Another object of the present invention is to provide a method for designing a spray gun, in particular a hand-held compressed air atomizing paint spray gun, by means of which the actual spray pressure can be determined more precisely than in the prior art.

The first object is achieved by means of 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 material nozzle for dispensing a material to be sprayed, at least one air nozzle for dispensing air, in particular air for atomizing a material to be sprayed Material, air to change the shape of a spray jet, and / or air to transport an atomized spray medium, and at least one air chamber, in particular an air chamber upstream of the air nozzle or at least one air outlet opening of the air nozzle, for supplying the air nozzle with air wherein the spray gun furthermore has at least one device for inputting and / or setting and / or detecting and / or determining and / or displaying the air pressure prevailing in the air chamber during operation of the spray gun.

The spray gun can in particular be a gravity cup 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.

The fact that the air chamber for supplying the air nozzle with air is adjacent to the air nozzle or at least one air outlet opening of the air nozzle upstream means in the present case that the air chamber is located directly behind the air nozzle and that the air flowing out of the air chamber passes directly through the at least one The air outlet opening of the air nozzle flows. The air chamber is not completely closed, but has at least one air inlet and - in the form of the air nozzle or the air outlet opening of the air nozzle - at least one air outlet. The air chamber can be formed by one component of the spray gun alone or by several components. In particular, the air chamber can be formed by the air nozzle, for example the air chamber can be configured as a milled recess or hole in the air nozzle be. The air chamber is generally preferably a cavity which, upstream, directly adjoins an air outlet opening in the air nozzle. Upstream means in the present case against the air flow. There can be more than one air chamber, in particular there can be two, three or four air chambers. In particular, there can be at least one air chamber for air for atomizing a material to be sprayed, at least one air chamber, preferably two air chambers, for air for changing the shape of a spray jet, and / or at least one air chamber for air for transporting an atomized spray medium. The air chambers preferably adjoin the respective air outlet opening, which is responsible for the outlet of the respective air, upstream. That is, an air chamber for air for atomizing a material to be sprayed adjoins the air outlet opening for the outlet of atomizing air upstream, the air chamber for air for changing the shape of a spray jet adjoins the air outlet opening for the outlet of shaping air upstream, and / or the air chamber for air for the transport of an atomized spray medium is upstream adjacent to the air outlet opening for the outlet of transport air.

The air pressure prevailing in the air chamber during operation of the spray gun is in particular what is known as the internal nozzle pressure. In particular, it is the relative pressure with the ambient pressure as a reference variable. Operation of the spray gun is understood to mean that at least the air valve of the spray gun is open so that air, in particular compressed air, can flow from an air inlet of the spray gun into the air chamber and to at least one air outlet opening of the spray gun. This state is usually achieved by lightly pressing the trigger of the spray gun. If the trigger guard is operated further, the flow of the material to be sprayed is also activated, in particular when the paint needle emerges from the material outlet opening of the material nozzle. This state is also seen here as operation of the spray gun.

The at least one device for inputting and / or setting and / or recording and / or ascertaining and / or displaying the air pressure prevailing in the air chamber during operation of the spray gun can be configured in a variety of ways. Several identical and / or several different devices can be provided, which can also be combined and / or connected to one another, in particular connected to one another in a communicating manner.

A device for inputting and / or setting the air pressure prevailing in the air chamber during operation of the spray gun can serve to establish a specific setpoint value for the air pressure or to send it to a control and / or regulating device communicate. The device for inputting and / or setting the air pressure prevailing in the air chamber during operation of the spray gun can be designed, for example, as a keyboard, touch display, rotary wheel, button arrangement, selector lever or have such means. The device for inputting and / or setting the air pressure prevailing in the air chamber during operation of the spray gun can be arranged inside or on the spray gun, the device for inputting and / or setting the air pressure prevailing in the air chamber during operation of the spray gun or another Means for inputting and / or setting the air pressure prevailing in the air chamber during operation of the spray gun can, however, also be arranged outside the spray gun.

A device for detecting the air pressure prevailing in the air chamber during operation of the spray gun can serve to measure an actual value for the air pressure and, if necessary, to a control and / or regulating device and / or to a device for displaying the air pressure during operation the spray gun in the air chamber to communicate the prevailing air pressure. The device for detecting the air pressure prevailing in the air chamber during operation of the spray gun can be designed, for example, as a pressure measuring device, in particular as a pressure sensor. For example, the pressure sensor can be designed as an absolute pressure sensor, a differential pressure sensor or a relative pressure sensor. A combination of several similar and / or different sensors or pressure measuring devices can also be advantageous. For example, piezoresistive pressure sensors, piezoelectric pressure sensors, capacitive pressure sensors and / or inductive pressure sensors can be used.

A device for determining the air pressure prevailing in the air chamber during operation of the spray gun differs from the device for detecting the air pressure prevailing in the air chamber during operation of the spray gun in that the air pressure prevailing in the air chamber differs from the device for determining the air pressure in the air chamber Operation of the spray gun in the air chamber in contrast to the device for detecting the air pressure in the air chamber during operation of the spray gun is not measured directly, but is determined from other parameters, in particular calculated. To determine the air pressure prevailing in the air chamber during operation of the spray gun, for example, an air pressure prevailing outside the air chamber, in particular an air pressure prevailing outside the air chamber but inside the spray gun, in particular an air pressure prevailing outside the air chamber but inside the spray gun during operation of the spray gun , in particular a gun inlet pressure, a temperature, a flow rate, a volume flow, a position of an attachment and / or an operating part of the spray gun, such as one Trigger guard and / or a rotary knob, a dimension of at least a part of the spray gun, in particular an air cap and / or a material nozzle, and / or another parameter can be used. To determine these parameters, measuring devices, in particular sensors, such as pressure measuring devices, in particular pressure sensors, temperature measuring devices, in particular thermometers or temperature sensors, flow measuring devices, in particular flow sensors or flow meters, in particular by means of impellers, vortex or ultrasound, and / or thermal flow meters, flow meters or anemometers can be used Position measuring devices, in particular sensors or detectors for position measurement, which are also referred to as displacement transducers, distance sensors, position sensors or distance sensors, but also proximity switches or proximity sensors are used. Some of the parameters, for example a nozzle size, can, however, also be entered via an input device which can be configured, for example, as a keyboard, touch display, rotary knob, button arrangement, selector lever or which can have such means. The input device can, however, also be designed as an identification and / or data acquisition device, such as, for example, a barcode reader or RFID reader.

A device for displaying the air pressure prevailing in the air chamber during operation of the spray gun can serve to display an actual value and / or a setpoint value for the air pressure. It is preferably an electrical or electronic display, in particular a screen or a display, in particular an LCD or OLED display, which is particularly preferably arranged in the base body of the spray gun. However, it can also be a mechanical or electromechanical display.

The devices mentioned can be connected to one another, in particular connected to one another in a communicating manner. Communication between facilities can take place, for example, by means of cables or wires or wirelessly, e.g. via radio, satellite, Bluetooth, WLAN, ZigBee, NFC, Wibree, WiMAX, LoRaWAN and / or IrDA.

The second object is achieved by means of a pressure measuring device for a spray gun, in particular for a hand-held, compressed air atomizing paint spray gun, in particular for a spray gun described above and below, the spray gun having at least one material nozzle for dispensing a material to be sprayed, at least one air nozzle for dispensing air, in particular of air for atomizing a material to be sprayed, of air for changing the shape of a spray jet, and / or of air for transporting an atomized spray medium, and at least one air chamber for supplying the air nozzle with air, the spray gun also having at least one air duct for Directing air, in particular compressed air, from an air inlet to the air nozzle, the pressure measuring device having at least one device for detecting an air pressure, in particular a pressure sensor, the pressure measuring device being fastened or fastenable, in particular removably fastened or fastened, to a spray gun in such a way that the pressure measuring device is in communication with the air duct, and wherein the pressure measuring device also has a device for determining, in particular calculating, the air pressure prevailing in the air chamber during operation of the spray gun based on the air pressure value determined by the device for detecting an air pressure, in particular the pressure sensor.

The air pressure prevailing in the air chamber during operation of the spray gun is in particular the so-called internal nozzle pressure.

The pressure measuring device can, for example, be arranged on the spray gun instead of a device for regulating the air supply, in particular instead of an air micrometer. However, it can also be arranged at the lower end of the handle of the spray gun, in particular at the air inlet or air connection. In particular, it can be designed similarly to the pressure measuring device disclosed in DE 10 2009 020 194 A1.

The third object is achieved by means of a method for designing a spray gun, in particular a hand-held compressed air atomizing paint spray gun, in particular a spray gun described above and below, the spray gun having at least one air nozzle for dispensing air, in particular air for atomizing a material to be sprayed, of air to change the shape of a spray jet, and / or of air to transport an atomized spray medium, and at least one air chamber, in particular an air chamber adjoining the air nozzle or at least one air outlet opening of the air nozzle upstream, in particular one of a material nozzle of the spray gun and an air cap of the spray gun formed air chamber for supplying the air nozzle with air, the method at least determining a discrepancy between a first air pressure, which during operation of the spray gun inside the spray gun at egg A first position and a second air pressure that prevails inside the spray gun at a second position during operation of the spray gun, the first position being inside the air chamber and the second position being outside of the air chamber.

The first air pressure that prevails inside the spray gun at a first position, the first position being inside the air chamber for supplying the air nozzle with air can be measured, for example, with the help of a so-called test air cap. This is a special air cap that is placed on the spray gun instead of the usual air cap. The test air cap usually has two pressure gauges, one of which is connected to the atomizing air area via a bore in the test air cap and the other is connected to the horn air area via a further bore in the test air cap. Appropriate use of the spray gun is not possible with the test air cap on. The first air pressure can, however, also be carried out by means of another pressure measuring device which is temporarily arranged on the air nozzle or in the air chamber.

The second air pressure, which prevails inside the spray gun at a second position, the second position being outside the air chamber for supplying the air nozzle with air, can be carried out with a pressure measuring device, in particular a pressure sensor, which is also temporarily or permanently attached to the Measuring position is arranged.

The deviation between the first air pressure and the second air pressure, i.e. the deviation between the air pressure inside the air chamber and the air pressure outside the air chamber, can in particular depend on the amount of the air pressure, in particular the amount of the second air pressure. A high air pressure can cause a high deviation. The method can provide for recording at least one characteristic curve which shows, for example, the first air pressure as a function of the second air pressure and / or a gun inlet pressure, and / or the deviation between the first air pressure and the second air pressure as a function of the first air pressure and / or the second air pressure and / or from gun inlet pressure. The recording, i.e. in particular the creation, documentation and / or storage of the characteristic curve, can take place manually or automatically.

A manual recording can take place, for example, in such a way that the second air pressure is set to a first, for example relatively small, value and the first air pressure is measured and documented. The second air pressure is then set to a second value, which is slightly greater than the first value, and the first air pressure is measured and documented again. The second air pressure is then set to a third value, which is again slightly greater than the second value, and the first air pressure is measured and documented again. In this way, the process can continue until the maximum permissible pressure is reached. If the measuring points are connected in an XY diagram, with the second air pressure plotted on the X axis and the first air pressure on the Y axis, for example, a characteristic curve is obtained that shows the first air pressure as a function of the second air pressure. The characteristic curve can be recorded automatically in the same way as the manual characteristic curve, with the setting of the values for the second air pressure and the measurement and documentation of the associated values for the first air pressure being carried out by one or more devices, in particular being carried out independently.

The deviations, the series of deviations and / or the characteristic curve can of course also be obtained by computer simulation methods.

The deviation between the first air pressure and the second air pressure, ie the deviation between the air pressure inside the air chamber and the air pressure outside the air chamber, can also depend on other factors, e.g. on the material nozzle used and / or on the air nozzle used, in particular the type and / or of at least one dimension of the material nozzle used and / or of the type and / or of at least one dimension of the air nozzle used, in particular the so-called nozzle size, and / or whether the nozzle or the nozzle set is, for example, an HVLP Nozzle, a Compliant nozzle or a conventional nozzle. A separate characteristic curve is preferably recorded for several, in particular all, possible nozzles and / or nozzle sets that are used, i.e. that can be arranged in or on the spray gun. A nozzle set usually consists of a material nozzle, an air nozzle and a paint needle.

Is the deviation between the first air pressure and the second air pressure, ie the deviation between the air pressure inside the air chamber and the air pressure outside the air chamber, possibly depending on the amount of the air pressure, in particular the amount of the air pressure outside the air chamber, and / or in Depending on the nozzle, or if the characteristic curve described above is known, in particular for a specific nozzle, it is sufficient to measure the air pressure outside the air chamber and can thus determine, in particular calculate, the air pressure inside the air chamber. The determination of the deviation, in particular the recording of the characteristic curve, is preferably carried out by the manufacturer of the spray gun. It is thus possible to dispense with a device for detecting an air pressure within the air chamber during operation of the spray gun. This simplifies the manufacture of the spray gun and prevents disturbances to the air flow in the air chamber, which a device for detecting the air pressure within the air chamber could cause.

The method according to the invention can, for example, provide that, in particular by the manufacturer of the spray gun, a first nozzle or a first set of nozzles is inserted into the spray gun, a first device for detecting a first air pressure prevailing inside the air chamber, in particular a first pressure sensor, in or on the spray gun is placed, a second device for detecting a second air pressure prevailing outside the air chamber, in particular a second pressure sensor, is arranged in or on the spray gun, the second device for detecting a second air pressure, in particular the second pressure sensor, being arranged in the spray gun in such a way that it or it is in communication with an air duct inside the spray gun. It can then be provided that compressed air is supplied to the spray gun, a first air pressure is measured inside the air chamber and a second air pressure outside the air chamber, and the deviation between the first air pressure and the second air pressure is determined. In particular, as described above, a characteristic curve can be recorded. The series of deviations or the characteristic curve, preferably linked to information about the nozzle or the nozzle set used, is stored, in particular stored, in a data processing device described in more detail below, which can also be viewed as an evaluation unit. This data processing device is or will be connected to the second device for detecting a second air pressure, in particular the second pressure sensor, outside the air chamber. The determination of deviations or the recording of characteristic curves is preferably repeated for several different nozzles or nozzle sets and the series of deviations or the characteristic curves are again preferably linked to information about the nozzle or the nozzle set used in the data processing device deposited, in particular saved. Finally, the first device for detecting a first air pressure prevailing inside the air chamber, in particular the first pressure sensor, can be removed from or from the spray gun. The data processing device is programmed in such a way that as soon as the device for detecting a second air pressure prevailing outside the air chamber, in particular the second pressure sensor, detects a value for the air pressure, it outputs not the detected value but the value for the air pressure corrected for the deviation, which is then displayed by a device described in more detail below for displaying an air pressure. This shows the air pressure in the air chamber, even though the air pressure was measured at a different point in the spray gun.

Of course, as an alternative to the series of deviations or the characteristic curve, only one standard deviation can be taken into account. That is to say, provision can be made to always subtract or add the same value from the device for detecting an air pressure prevailing outside the air chamber in order to determine the air pressure prevailing inside the air chamber.

Advantageous refinements are the subject of the subclaims. The spray gun according to the invention preferably also has an air cap with a central opening, the central opening together with a front region of the material nozzle forming an annular gap for dispensing air for atomizing a material to be sprayed, and at least one air chamber from the material nozzle and the air cap is formed. The front area of the material nozzle is preferably designed as a hollow cylindrical cone, but it can also be designed, for example, conical. The cavity is formed by an outer surface of the material nozzle and an inner surface of the air cap. In addition to the annular gap for dispensing air to atomize a material to be sprayed, the air cap can have further air outlet openings, in particular horn air or shaped air openings, which can be arranged in horns on the air cap and from which air to change the shape of a spray jet, the so-called shaped air , flows out, and / or control openings, which can be introduced into the air cap next to the central opening in the air cap and from which air flows out to transport an atomized spray medium, in particular away from the spray gun and in the direction of an object to be coated, the so-called transport air . In addition to the air chamber formed by the material nozzle and the air cap, the spray gun can have further air chambers which are designed, for example, as bores in the horns of the air cap. The types of air can of course also fulfill other purposes than those mentioned, in particular a subsequent atomization of the spray jet.

Particularly preferably, at least one device for detecting an air pressure, in particular a pressure sensor, is arranged in the air chamber, in particular on an inner surface of the air cap and / or on an outer surface of the material nozzle Regulation of an air pressure, in particular a mechanical, electronic and / or electromechanical device for controlling and / or regulating an air pressure, and / or is connected and / or connectable to a device for displaying an air pressure and / or to a data processing device.

The device for detecting an air pressure, in particular the pressure sensor, can, for example, be glued or soldered to an inner surface of the air cap and / or to an outer surface of the material nozzle, and / or it can thus be inserted into the inner surface of the air cap and / or on the outer surface of the material nozzle be incorporated that the inner surface of the air cap with the outer surface of the device for detecting an air pressure, in particular the pressure sensor, essentially form a flat surface, or the outer surface of the material nozzle with the outer surface of the device for detecting an air pressure, in particular the pressure sensor, in Essentially form a flat surface. That is to say, the device for detecting an air pressure, in particular the pressure sensor, preferably does not protrude beyond the inner surface of the air cap or the outer surface of the fluid nozzle. In this way, disturbances in the air flow caused by the device for detecting an air pressure, in particular the pressure sensor, can be avoided.

The device for controlling and / or regulating an air pressure, in particular the device for controlling an air pressure, can be designed by means of a simple mechanical rotary knob, the rotary knob or a part arranged on it engaging mechanically in an air duct, for example protruding and / or him at least partially covers, in particular changes its flow cross-section. In the present case, a control is to be understood in particular as an analog control without feedback. One advantage of such a control lies in its simplicity, in particular in its simple and thus cost-effective structure, which can also do without a measuring device. However, malfunctions, e.g. a drop in pressure, have to be reacted to manually.

In contrast, a device designed as a device for regulating an air pressure for controlling and / or regulating an air pressure can keep the air pressure constant by the system measuring the variable to be influenced, here the air pressure, and continuously comparing it with the desired target value. An actuator, which can be designed as part of the control device or as a separate part, acts on the controlled system in such a way that the actual value corresponds to the setpoint. The actuator or actuators can in the present case be arranged in or on the spray gun, but it or they can also be arranged remote from the spray gun, e.g. in or on an air hose, or in or on a compressor. Valves, diaphragms or throttles, in particular those which can open and close, preferably continuously, can be useful for the present application.

The device for controlling and / or regulating an air pressure is preferably designed as part of the spray gun and arranged on or in it, and the device for detecting an air pressure, in particular the pressure sensor, is wirelessly and / or wired to it and / or can be connected to it. However, it is also conceivable that the device for detecting an air pressure, in particular the pressure sensor, is connected and / or can be connected wirelessly and / or wired to a device for controlling and / or regulating an air pressure which is arranged away from the spray gun.

The device for displaying an air pressure can display, for example, the setpoint value and / or the actual value of an air pressure. The device for displaying an air pressure is preferably an electrical or electronic display, in particular a screen or a display, in particular an LCD or OLED display, which is particularly preferably arranged in the base body of the spray gun. However, it can also be a mechanical or electromechanical display. The device for displaying an air pressure is preferably designed as part of the spray gun and is arranged on or in it, and the device for detecting an air pressure, in particular the pressure sensor, is wirelessly and / or wired to it and / or can be connected to it. However, it is also conceivable that the device for detecting an air pressure, in particular the pressure sensor, is connected and / or can be connected wirelessly and / or wired to a device for displaying an air pressure which is arranged away from the spray gun.

The data processing device, which can also be viewed as an evaluation unit, can be designed as a microprocessor or have a microprocessor and / or it can be designed as a controller or have a controller. The task of the data processing device can be to acquire data or commands, in particular measured values, measured data or setpoint values, to process them and, if necessary, to output data, signals or the like. The data processing device can, for example, be designed in such a way that it can access one or more characteristic curves described above, and can thus determine, in particular calculate, an air pressure that prevails inside the air chamber from an air pressure that prevails outside the air chamber.

The spray gun according to the invention preferably also has at least one air channel for guiding air, in particular compressed air, from an air inlet to an air outlet, the spray gun also having at least one device for detecting an air pressure, in particular a pressure sensor, which is located outside the air chamber, in particular inside at least one air channel formed upstream of the air chamber and / or within a compressed air chamber connected to an air channel upstream of the air chamber, wherein the spray gun also has a device for determining, in particular calculating, the air pressure prevailing in the air chamber during operation of the spray gun based on the has air pressure value determined by the device for detecting an air pressure, in particular the pressure sensor. The device for detecting an air pressure can in particular be designed like that in the above-mentioned DE 10135104 C1 or like that in the above-mentioned DE 10 2009 020 194 A1 pressure measuring device and how these pressure measuring devices are arranged in or on the spray gun. The pressure measuring devices described in the publications mentioned measure, depending on the embodiment, the gun inlet pressure or the air pressure in a pressure chamber near the air valve which can be actuated by means of the trigger guard. However, the air pressure in this pressure space is not the same as the pressure in the air chamber, but there is a pressure difference.

The device for determining, in particular calculating, the air pressure prevailing in the air chamber during operation of the spray gun based on the air pressure value determined by the device for detecting an air pressure, in particular the pressure sensor, which the spray gun according to the invention preferably has, takes this pressure difference into account. Said device can be designed like the data processing device or evaluation unit described above and / or how they function. Like the data processing device, at least one of the above-described deviations and / or at least one of the above-described characteristic curves can be stored in the device and it can be programmed in such a way that it is made up of the above-mentioned device for detecting an air pressure, which is arranged outside the air chamber and measures an air pressure inside the spray gun but outside the air chamber, the air pressure determined determines the air pressure inside the air chamber, in particular calculated, preferably depending on the amount of air pressure outside the air chamber and / or depending on the nozzle or nozzle set used.

Said device for detecting an air pressure and the device for determining, in particular calculating, the air pressure prevailing in the air chamber during operation of the spray gun based on the air pressure value determined by the device for detecting an air pressure, in particular the pressure sensor, are connected to one another, in particular communicating connected with each other. Communication between the devices can take place, for example, by means of cables or wires or wirelessly, e.g. via radio, satellite, Bluetooth, WLAN, ZigBee, NFC, Wibree, WiMAX, LoRaWAN and / or IrDA.

The spray gun according to the invention preferably has at least one device for determining, in particular calculating, the air pressure prevailing in the air chamber during operation of the spray gun and at least one exchangeable component, in particular an exchangeable nozzle arrangement, in particular an exchangeable material nozzle and / or an exchangeable air nozzle, wherein the device for determining, in particular calculating, the air pressure prevailing in the air chamber during operation of the spray gun is designed such that the determination, in particular calculation, of the air pressure prevailing in the air chamber during operation of the spray gun is a function of of at least one parameter of the exchangeable component, in particular the exchangeable nozzle arrangement, in particular the type of exchangeable component, in particular the exchangeable nozzle arrangement, and / or at least one dimension of the exchangeable component, in particular the exchangeable nozzle arrangement, in particular at least one inner and / or outer diameter of a Opening in the nozzle arrangement, determined, in particular calculated, is. The above statements regarding the deviation between the air pressure inside the air chamber and the air pressure outside the air chamber as a function of other factors, for example the material nozzle used and / or the air nozzle used, can also apply here. The device for determining, in particular calculating, the air pressure prevailing in the air chamber during operation of the spray gun is particularly preferably the above-mentioned device for determining, in particular calculating, the air pressure prevailing in the air chamber during operation of the spray gun based on the air pressure value determined by the device for detecting an air pressure, in particular the pressure sensor.

The spray gun according to the invention preferably has at least one exchangeable component, in particular an exchangeable nozzle arrangement, in particular an exchangeable material nozzle and / or an exchangeable air nozzle, and at least one device for acquiring information, in particular information about a type and / or about a dimension of the Spray gun arranged component, in particular a nozzle size, on and / or is wirelessly and / or wired connected and / or connectable to such a device.

The device for acquiring information is preferably part of the spray gun and is arranged in or on it.

The device for capturing information can be designed as a manual input device, for example as a keyboard, touch display, rotary wheel, button arrangement or selector lever, or it can have such means. The device for capturing information can, however, also be designed as an identification and / or data capture device, such as a barcode reader or RFID reader. In the latter case, the replaceable component, in particular the replaceable nozzle arrangement, in particular the replaceable Material nozzle and / or the exchangeable air nozzle, a barcode, in particular a barcode or a QR code, or an RFID chip or other marking and / or identification means, which is recorded, in particular read, by the device for recording information can be. The device for capturing information can be configured as part of the device for determining, in particular calculating, the air pressure prevailing in the air chamber during operation of the spray gun, or can be connected to it, in particular wired and / or wirelessly communicating with it. The information acquired by the device for acquiring information can be used to determine, in particular to calculate, the air pressure prevailing in the air chamber during operation of the spray gun based on the air pressure value determined by the device for acquiring an air pressure, in particular the pressure sensor. As already described above, recorded deviations, series of deviations and / or characteristic curves can be linked with information about the nozzle or the nozzle set used. Depending on the information that was acquired by the device for acquiring information, for example another deviation, series of deviations and / or characteristic curve can be used to determine, in particular to calculate, the air pressure prevailing in the air chamber during operation of the spray gun. For example, the manufacturer of the spray gun has built a specific set of nozzles into the spray gun in order to record a characteristic curve described above and link the characteristic curve to the type of nozzle set installed. If the user of the spray gun uses the spray gun with this nozzle set, the device for acquiring information recognizes this type of nozzle set or the user enters the type of nozzle set into the device for acquiring information, whereupon one connected to the device for acquiring information Device for determining, in particular calculating, the air pressure prevailing in the air chamber during operation of the spray gun, or a data processing device or an evaluation unit, the characteristic curve associated with this type of nozzle set for determining, in particular calculating, the characteristic curve for determining, in particular calculating, the during operation of the spray gun in the air chamber prevailing air pressure based on a prevailing outside of the air chamber in the spray gun detected air pressure.

The device for acquiring information can also be viewed as a device for identifying the component arranged in the spray gun.

As above, communication between the devices can also take place here, for example by means of cables or wires or wirelessly, for example via radio, satellite, Bluetooth, WLAN, ZigBee, NFC, Wibree, WiMAX, LoRaWAN and / or IrDA. The spray gun according to the invention preferably has at least one device for regulating and / or limiting the air pressure prevailing in the air chamber during operation of the spray gun and / or is wirelessly and / or wired to and / or can be connected to such a device.

The device for regulating and / or limiting the air pressure prevailing in the air chamber during operation of the spray gun is preferably part of the spray gun and is arranged in or on it.

The spray gun according to the invention and / or the device for regulating and / or limiting the air pressure prevailing in the air chamber during operation of the spray gun can have at least one device for entering a target value and / or a minimum value and / or a maximum value for the during operation of the spray gun have the air pressure prevailing in the air chamber and / or be connected and / or connectable to such a device in a wireless and / or wired manner. With the device for entering a target value and / or a minimum value and / or a maximum value, a target value, a minimum value and / or a maximum value for the air pressure prevailing in the air chamber can be established or communicated to a control device. A device for detecting at least one air pressure measures the actual value of the air pressure, in particular the air pressure for which a target value has been established.

The device for regulating and / or limiting the air pressure prevailing in the air chamber during operation of the spray gun preferably has at least one actuator or is connected to at least one actuator in order to be able to set the air pressure. It is conceivable that the manufacturer specifies a maximum value for the air pressure prevailing in the air chamber, for example the maximum permissible internal nozzle pressure of 0.7 bar (10 psi) for HVLP spray guns.

The spray gun according to the invention preferably has at least one device for outputting a signal, in particular an optical, acoustic and / or haptic signal, which with a device for determining, in particular calculating, the air pressure prevailing in the air chamber during operation of the spray gun, with a A device for controlling and / or regulating and / or limiting an air pressure, connected and / or connectable to a device for displaying an air pressure and / or to a data processing device. By means of a device for outputting a signal, for example, a warning signal can be output, for example a warning sound or a warning light, if the air pressure falls below a a certain value falls, exceeds a certain value or when strong pressure fluctuations are detected.

As above, communication between the devices can also take place here, e.g. by means of cables or wires or wirelessly e.g. via radio, satellite, Bluetooth, WLAN, ZigBee, NFC, Wibree, WiMAX, LoRaWAN and / or IrDA.

The spray gun according to the invention preferably has at least one nozzle arrangement with at least one air nozzle, in particular an air nozzle with an air cap, wherein the air nozzle has at least one first outlet opening, in particular a central opening, for the outlet of atomizing air and at least one second outlet opening, in particular at least two second outlet openings , in particular molding air openings, for the outlet of molding air, wherein at least one first device for detecting an air pressure is arranged in the area of the first outlet opening of the air nozzle, in particular in the area of the central opening, and / or wherein at least one second device for detecting an air pressure in the Area of the second outlet opening of the air nozzle, in particular in the area of at least one shaping air opening, is arranged. In this way, the air pressure in the immediate vicinity of the air outlet openings, which is one of the decisive factors for the quality of the atomization and generally for the painting result, can be recorded, in particular measured, as precisely as possible.

A preferred embodiment of a pressure measuring device according to the invention has a device for recording information, in particular a manufacturer and / or a model of a spray gun, a type and / or a dimension of a component arranged in a spray gun, in particular a nozzle size, and / or is associated with a such a device wirelessly and / or wired connected and / or connectable.

The above statements relating to the device for acquiring information that the spray gun according to the invention can have also apply to the present device for acquiring information. Furthermore, the present device can detect the manufacturer and / or the model of a spray gun as additional information. This can be done either manually or automatically when arranging the pressure measuring device on a spray gun. For example, contacts that enable the transfer of information can engage one another during the arrangement.

The pressure measuring device according to the invention preferably has at least one display device, in particular for displaying a pressure value. This is particularly preferably a display, in particular an LCD or OLED display. The pressure measuring device according to the invention preferably has at least one device for outputting a signal, in particular an optical, acoustic and / or haptic signal, which with a device for determining, in particular calculating, the air pressure prevailing in the air chamber during operation of the spray gun, with a Device for controlling and / or regulating and / or limiting an air pressure, connected and / or connectable to a device for displaying an air pressure and / or to a data processing device. The above statements relating to the device for outputting a signal that the spray gun according to the invention can have also apply to the present device.

The method according to the invention can comprise, as at least one further step, the design of a pressure measuring device for the spray gun, the pressure measuring device being designed in such a way that it detects the deviation between a first air pressure inside the spray gun at the first position and a second air pressure inside the spray gun at the second Position taken into account, especially taken into account arithmetically. The method according to the invention particularly preferably comprises at least the arrangement of the pressure measuring device, in particular the pressure sensor, at the second position. Reference is made to the above statements regarding the consideration of deviations and the arrangement of a pressure measuring device.

The invention is explained in more detail below by way of example with the aid of three figures. Show:

Fig. 1 is a perspective view of an embodiment of a spray gun according to the invention,

2 shows a sectional view of the head region of an exemplary embodiment of a spray gun according to the invention, and

3 shows a diagram with an example of a characteristic curve which shows the air pressure inside an air chamber plotted against the air pressure outside an air chamber, and for a characteristic curve which shows the deviation between the air pressure outside an air chamber and the air pressure inside an air chamber plotted against the Shows air pressure outside an air chamber.

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 an air inlet 4 is arranged. The spray gun 1 also has an air nozzle 5, which in the present case is 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. In the exemplary embodiment shown, the air cap 9 has two horns 13a, 13b, each with two horn air openings. In addition, it has a central opening 15, which in the present case forms an annular gap together with a material nozzle screwed into the base body 3. On two opposite sides of the central opening 15 next to the central opening 15, a plurality of control openings 17 are made in each case. 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 trigger 18 is 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 through which the amount of air flowing from an air inlet duct arrangement (not visible in FIG. 1), which extends upwards from the air inlet 4 through the handle of the spray gun 1, flows into an upper part of the gun body 3, is adjustable. For this purpose, 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 according to the invention 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 guided by it or it can flow out of the annular gap formed by the central opening 15 and the material nozzle screwed into the base body 3 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. This air outlet duct arrangement can be referred to as a shaped air duct arrangement or as a shaped air duct. The air conducted by him or her can come from the Form air openings 20 of the horns 13a, 13b flow out and are referred to as form air. In FIG. 1, a round broad jet rotary knob 23 for actuating a control device for distributing the air flowing out of the air inlet duct arrangement between the atomizing air duct arrangement and the shaping air duct arrangement can be seen.

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. In the present exemplary embodiment, it is 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.

The device for detecting an air pressure, in particular the pressure sensor, detects, in particular measures, in the present case the air pressure in a pressure chamber near the air valve which can be actuated by means of the trigger guard 18. The device for determining the air pressure prevailing in an air chamber during operation of the spray gun 1 determines, in particular calculated, from this measured compressed air value at a position outside the air chamber adjoining at least one upstream of an air outlet opening that prevailing in the air chamber during operation of the spray gun 1 Air pressure. This is done by taking into account a known deviation and / or series of deviations between the air pressure values and / or a characteristic curve described above stored in this device that is stored in the device for determining the air pressure prevailing in the air chamber during operation of the spray gun 1, as described above.

The device for displaying the air pressure prevailing in the air chamber during operation of the spray gun preferably displays the air pressure prevailing in the air chamber during operation of the spray gun 1 by means of the display 29.

The spray gun 1 can, however, also have a device for detecting an air pressure, in particular a pressure sensor, which is arranged in the air chamber and which is wireless and / or wired with a device for controlling and / or regulating an air pressure and / or is connected to a device for displaying an air pressure and / or to a data processing device. The device for detecting an air pressure, in particular the pressure sensor, can be arranged inside the air chamber and directly detect, in particular measure, the air pressure prevailing in the air chamber during operation of the spray gun 1, and for example to a device for displaying an air pressure with which the device for detecting an air pressure, in particular the Pressure sensor, preferably connected wirelessly, transmitted. For example, the air pressure prevailing in the air chamber during operation of the spray gun 1 can be displayed on the display 29, for example.

Fig. 2 shows a sectional view of the head area of an embodiment of a spray gun according to the invention. An air nozzle 5, which in the present case has an air cap 9 and an air nozzle ring 11, is arranged on the head area of the base body 3. The air cap 9 has two horns 13a, 13b and several air outlet openings, namely a central opening 15, several control openings 17, and two shaped air openings 20 each in the horn 13a and in the horn 13b. A material nozzle 40 screwed into the base body 3 of the spray gun 1 has a material outlet opening 28. The front end of the material nozzle 40 forms with the central opening 15 an annular gap for the outlet of atomizing air. Material nozzle 40 and air cap 9 form a first air chamber 80. This is one of the air chambers, the air pressure of which is of particular interest in the present case. A first device for detecting an air pressure 42 is arranged in the air chamber 80, in the present exemplary embodiment on an inner surface of the air cap 9. The first device for detecting an air pressure 42 is partially sunk into the air cap 9. However, it can also be introduced into the air cap 9 in such a way that the inner surface of the air cap 9 and the outer surface of the device for detecting an air pressure 42 form a flat surface without steps.

A second air chamber 82, the air pressure of which is also of interest in the present case, is designed as a bore in the horn 13a. A second device for detecting an air pressure 43 is arranged in it. The horn 13b also has an air chamber designed as a bore, but in the present case no device for detecting an air pressure. As a rule, due to the symmetrical arrangement of the two horns 13a, 13b and because they are supplied with air from the same air duct arrangement, it is not necessary to arrange a device for detecting an air pressure in both horns 13a, 13b, since the pressure in the two Horns 13a, 13b is usually the same size. Of course, it is also possible to arrange devices for detecting an air pressure in both air chambers of the horns 13a, 13b.

During operation of the spray gun, atomizing air, which flows from an atomizing air duct arrangement in the base body 3 of the spray gun 1 into the first air chamber 80, flows through the annular gap formed by the front end of the material nozzle 40 with the central opening 15. The atomizing air thereby generates an air pressure in the first air chamber 80, the amount of which is of interest here. If air is in the air duct arrangement in the base body 3 of the Spray gun 1 is directed, in particular through a round-wide-jet regulation that can be operated by the user of the spray gun 1 via a round-wide-jet rotary knob 21 shown in FIG The shaping air thereby generates an air pressure in the second air chamber 82, which air pressure can also be of interest. The value measured by the first device for detecting an air pressure 42 and / or the value measured by the second device for detecting an air pressure 43 can, for example, be sent to a device for controlling and / or regulating an air pressure and / or to a device for displaying an air pressure and / or sent to a data processing device. In the simplest case, the pressure value is sent to a device for displaying an air pressure, whereupon the pressure value is displayed, for example, on a display 29 shown in FIG. 1.

3 shows, by way of example, a first characteristic curve 92 which shows the air pressure outside an air chamber by plotting the air pressure inside an air chamber. The air pressure inside an air chamber was plotted along the primary vertical axis 94, and the air pressure outside an air chamber was plotted along the horizontal axis 95. The first characteristic curve 92 shows which air pressure prevails inside an air chamber at which air pressure outside the air chamber. For example, it can be seen that at a pressure of 0.5 bar outside the air chamber, there is also a pressure of 0.5 bar inside the air chamber. At a pressure of 2.5 bar outside the air chamber, the pressure inside the pressure chamber is only 2.3 bar. At a pressure of 5.0 bar outside the air chamber, the pressure inside the pressure chamber is only 4.7 bar.

The second characteristic curve 93 shows the deviation between the air pressure outside an air chamber and the air pressure inside an air chamber plotted against the air pressure outside an air chamber. In the present case, the deviation was calculated from the difference between the air pressure outside an air chamber and the air pressure inside an air chamber. The deviation was plotted along the vertical secondary axis 96, and the air pressure outside an air chamber was plotted along the horizontal axis 95. It can be seen that the deviation increases with increasing air pressure outside the air chamber. In reality, the deviation does not increase in stages, as shown in the diagram, but rather a continuous increase can be assumed. The step shape of the rise is due to the distance between the measuring points and the rounding of the measured values.

In general, the individual components mentioned in the exemplary embodiments can be used in all exemplary embodiments. Also the remarks on the Exemplary embodiments can apply to all exemplary embodiments. The statements relating to the spray gun according to the invention can also apply to the pressure measuring device according to the invention and to the method according to the invention, the statements relating to the pressure measuring device according to the invention can also apply to the spray gun according to the invention and to the method according to the invention, the statements to the method according to the invention can also apply to the spray gun according to the invention and for the pressure measuring device according to the invention apply.

The exemplary embodiments described describe only a limited selection of possible embodiments and therefore do not represent a restriction of the present invention.

Claims

Expectations

1. Spray gun (1), in particular compressed air atomizing paint spray gun, in particular hand-held compressed air atomizing paint spray gun, comprising at least one material nozzle (40) for dispensing a material to be sprayed, at least one air nozzle (5) for dispensing air, in particular air for atomizing a material to be sprayed , of air to change the shape of a spray jet, and / or of air to transport an atomized spray medium, and at least one air chamber (80, 82), in particular one upstream of the air nozzle (5) or at least one air outlet opening of the air nozzle (5 ) adjoining air chamber (80, 82) for supplying the air nozzle (5) with air, characterized in that the spray gun (1) also has at least one device for input and / or setting and / or detection and / or determination and / or display the air pressure prevailing in the air chamber (80, 82) during operation of the spray gun (1).

2. Spray gun (1) according to claim 1, characterized in that it further comprises an air cap (9) with a central opening (15), the central opening (15) together with a front region of the material nozzle (40) an annular gap to Forms dispensing air for atomizing a material to be sprayed, and wherein at least one air chamber (80, 82) is formed by the material nozzle (40) and the air cap (9).

3. Spray gun (1) according to claim 1 or 2, characterized in that in the air chamber (80, 82), in particular on an inner surface of the air cap (9) and / or on an outer surface of the material nozzle (40), at least one device for Detection of an air pressure (42, 43), in particular a pressure sensor, is arranged, which wirelessly and / or wired with a device for controlling and / or regulating an air pressure, in particular a mechanical, electronic and / or electromechanical device for controlling and / or regulating an air pressure, and / or is connected and / or connectable to a device for displaying an air pressure and / or to a data processing device.

4. Spray gun (1) according to one of the preceding claims, characterized in that it further comprises at least one air duct for guiding air, in particular compressed air, from an air inlet (4) to an air outlet, the spray gun (1) also having at least one device for detecting an air pressure (42, 43), in particular a pressure sensor, which is located outside the air chamber (80, 82), in particular is arranged within at least one air channel formed upstream of the air chamber (80, 82) and / or within a compressed air chamber connected to an air channel upstream of the air chamber (80, 82), the spray gun (1) also having a device for determining, in particular calculating, the air pressure prevailing in the air chamber (80, 82) during operation of the spray gun (1) based on the air pressure value determined by the device for detecting an air pressure (42, 43), in particular the pressure sensor.

5. Spray gun (1) according to one of the preceding claims, characterized in that it has at least one device for determining, in particular calculating, the air pressure prevailing in the air chamber (80, 82) during operation of the spray gun (1) and at least one replaceable component , in particular an exchangeable nozzle arrangement, in particular an exchangeable material nozzle (40) and / or an exchangeable air nozzle (5), wherein the device for determining, in particular calculating, the during operation of the spray gun (1) in the air chamber (80, 82 ) prevailing air pressure is designed in such a way that the determination, in particular calculation, of the air pressure prevailing in the air chamber (80, 82) during operation of the spray gun (1) as a function of at least one parameter of the replaceable component, in particular the replaceable nozzle arrangement, in particular the Type of replaceable component, especially the replaceable en nozzle arrangement and / or at least one dimension of the exchangeable component, in particular the exchangeable nozzle arrangement, in particular at least one inner and / or outer diameter of an opening (15, 20) in the nozzle arrangement, is determined, in particular calculated.

6. Spray gun (1) according to one of the preceding claims, characterized in that it has at least one exchangeable component, in particular an exchangeable nozzle arrangement, in particular an exchangeable material nozzle (40) and / or an exchangeable air nozzle (5), and at least one device for detection has information, in particular information about a type and / or about a dimension of the component arranged in the spray gun (1), in particular a nozzle size, and / or is connected and / or connectable to such a device in a wireless and / or wired manner.

7. Spray gun (1) according to one of the preceding claims, characterized in that it has at least one device for regulating and / or limiting the air pressure prevailing in the air chamber (80, 82) during operation of the spray gun (1) and / or is wireless and / or wired and / or connectable to such a device.

8. Spray gun (1) according to one of the preceding claims, characterized in that it has at least one device for entering a setpoint value and / or a minimum value and / or a maximum value for the during operation of the spray gun (1) in the air chamber (80, 82) has the prevailing air pressure and / or is connected and / or connectable to such a device in a wireless and / or wired manner.

9. Spray gun (1) according to one of the preceding claims, characterized in that it has at least one device for outputting a signal, in particular an optical, acoustic and / or haptic signal, which is provided with a device for determining, in particular calculating, the during the operation of the spray gun (1) in the air chamber (80, 82), with a device for controlling and / or regulating and / or limiting an air pressure, with a device for displaying an air pressure and / or connected to a data processing device and / or is connectable.

10. Spray gun (1) according to one of the preceding claims, characterized in that it has at least one nozzle arrangement with at least one air nozzle (5), in particular an air nozzle (5) with an air cap (9), the air nozzle (5) at least has a first outlet opening, in particular a central opening (15), for the outlet of atomizing air and at least one second outlet opening, in particular at least two second outlet openings, in particular shaped air openings (20), for the outlet of shaped air, at least one first device for detecting an air pressure ( 42) is arranged in the area of the first outlet opening of the air nozzle (5), in particular in the area of the central opening (15), and / or wherein at least one second device for detecting an air pressure (42) in the area of the second outlet opening of the air nozzle (5 ), in particular in the region of at least one molding air opening (20).

11. Pressure measuring device for a spray gun (1), in particular for a hand-held compressed air atomizing paint spray gun, in particular for a spray gun (1) according to one of claims 4 to 10, wherein the spray gun (1) has at least one material nozzle (40) for dispensing a material to be sprayed , at least one air nozzle (5) for dispensing air, in particular air for atomizing a material to be sprayed, air for changing the shape of a spray jet, and / or air for transporting an atomized spray medium, and at least one air chamber (80, 82 ) for supplying the air nozzle (5) with air, the spray gun (1) furthermore at least has an air duct for guiding air, in particular compressed air, from an air inlet (4) to the air nozzle (5), the pressure measuring device having at least one device for detecting an air pressure, in particular a pressure sensor, the pressure measuring device being connected to a spray gun (1 ) fastened or fastened, in particular removably fastened or fastened, is that the pressure measuring device is connected to the air duct, characterized in that the pressure measuring device also has a device for determining, in particular calculating, the during operation of the spray gun (1) in the air chamber (80, 82) the prevailing air pressure based on the air pressure value determined by the device for detecting an air pressure, in particular the pressure sensor.

12. Pressure measuring device according to claim 11, characterized in that it has a device for detecting information, in particular a manufacturer and / or a model of a spray gun (1), a type and / or a dimension of a component arranged in a spray gun (1), in particular a nozzle size, and / or is connected and / or connectable to such a device in a wireless and / or wired manner.

13. Pressure measuring device according to claim 11 or 12, characterized in that it has at least one display device, in particular for displaying a pressure value.

14. Pressure measuring device according to one of claims 11 to 13, characterized in that it has at least one device for outputting a signal, in particular an optical, acoustic and / or haptic signal, which is provided with a device for determining, in particular calculating, the during the Operation of the spray gun (1) in the air pressure chamber (80, 82), with a device for controlling and / or regulating and / or limiting an air pressure, with a device for displaying an air pressure and / or with a data processing device connected and / or is connectable.

15. A method for designing a spray gun (1), in particular a hand-held compressed air atomizing paint spray gun, in particular a spray gun (1) according to one of claims 4 to 10, wherein the spray gun (1) has at least one air nozzle (5) for dispensing air, in particular Air for atomizing a material to be sprayed, air for changing the shape of a spray jet, and / or air for transporting an atomized spray medium, and at least one air chamber (80, 82), in particular one upstream of the air nozzle (5) or at at least one air outlet opening of the air nozzle (5) adjoining the air chamber (80, 82), in particular one air chamber (80, 82) formed by a material nozzle (40) of the spray gun (1) and an air cap (9) of the spray gun (1) for supplying the air nozzle (5) with air, characterized in that the method comprises at least the Determination of a deviation between a first air pressure that prevails inside the spray gun (1) during operation of the spray gun (1) and a second air pressure that prevails inside the spray gun (1) during operation of the spray gun (1) a second position, the first position being inside the air chamber (80, 82) and the second position being outside the air chamber (80, 82).

16. The method according to claim 15, characterized in that the method comprises at least the design of a pressure measuring device for the spray gun (1), wherein the pressure measuring device is designed such that it measures the deviation between a first air pressure within the spray gun (1) at the first Position and a second air pressure inside the spray gun (1) at the second position taken into account, in particular taken into account mathematically.

17. The method according to claim 15 or 16, characterized in that the method comprises at least arranging the pressure measuring device, in particular the pressure sensor, at the second position.