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

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

[0001] The invention relates to a spray gun, in particular a paint spray gun, in particular a hand-held compressed air atomizing paint spray gun, according to the preamble of claim 1.

[0002] Spray guns, especially paint spray guns, operate using various pressure methods. Conventional spray guns operate at relatively high spray pressures of several bar. So-called HVLP guns have a maximum nozzle pressure of 10 psi or 0.7 bar, achieving transfer rates well over 65%. Compliant spray guns, on the other hand, have a nozzle pressure of more than 10 psi or 0.7 bar, but also achieve a transfer rate of more than 65%.

[0003] The nozzle pressure of a spray gun refers to the pressure within 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 may differ from that in the horn air area. However, the pressures in the atomizing air area and the horn air area can also be the same.

[0004] According to the prior art, a spray gun, in particular a paint spray gun, and especially a compressed air atomizing paint spray gun, has a paint nozzle at its head, which is screwed into the gun body. The paint nozzle often has a hollow cylindrical pin at its front end, from the opening of which the material to be sprayed emerges when the spray gun is operated. However, the paint nozzle can also be conical in its front section. The gun head generally has an external thread, via which an air nozzle ring with an air cap arranged therein is screwed onto the gun head. The air cap has a central opening whose diameter is larger than the outer diameter of the paint nozzle pin or the outer diameter of the front end of a conical paint nozzle. The central opening of the air cap and the pin or the front end of the paint nozzle together form an annular gap.The so-called atomizing air emerges from this annular gap. In the nozzle arrangement described above, this air creates a vacuum at the end face of the paint nozzle, drawing the material to be sprayed out of the nozzle. The material to be atomized is fed into the atomizing air and broken up into threads and ribbons. Due to their hydrodynamic instability, the interaction between the rapidly flowing compressed air and the ambient air, and aerodynamic disturbances, these threads and ribbons disintegrate into droplets, which are blown away from the nozzle by the atomizing air.

[0005] The air cap often further features two horns, which are diametrically opposed to each other and extend beyond the aforementioned annular gap and the material outlet opening in the outflow direction. Two supply bores, i.e., horn air supply channels, run from the rear of the air cap to horn air bores in the horns. As a rule, each horn has at least one horn air bore; preferably, each horn has at least two horn air bores from which the horn air exits. The horn air bores are generally oriented so that they point towards the nozzle's longitudinal axis in the exit direction after the annular gap, allowing the so-called horn air exiting the horn air bores to influence the air already exiting the annular gap, the paint jet, or the paint mist that has already at least partially formed.This causes the paint jet, or spray jet, which originally has a circular cross-section (round jet), to be compressed at its sides facing the horns and extended in a perpendicular direction. This creates a so-called wide jet, which allows for high speeds when painting large areas. In addition to deforming the spray jet, the air from the horns also further atomizes it.

[0006] Air channels are typically incorporated into the gun body, i.e., the base of the spray gun. Air from one of these channels, as described above, is directed to the annular gap for use as atomizing air, while air from another channel, also described above, is directed to the horn air openings for use as horn air. The air channels open into an end face of the gun body head and are directed to the annular gap and the horn air openings, respectively, via an air distribution system. This system often includes a distributor ring that separates the atomizing air area from the horn air area.

[0007] The air pressure in the spray gun, especially in the air chamber often formed by the air cap and material nozzle to supply the aforementioned annular gap for the outlet of atomizing air, but also in the horn air supply channels or the horn air bores in the horns, is one of the most crucial criteria for a high-quality painting result, especially for the quality of the atomization of the material to be sprayed.

[0008] For this reason, DE 10135104 C1 proposes to provide a pressure sensing and pressure display device 45 in a paint spray gun, wherein the paint spray gun has a paint nozzle 11 arranged on a gun body 1, an air nozzle 21 arranged around the paint nozzle 11, a compressed air valve 31, 32 arranged within a piston bore 33 in the gun body 1 for controlling the compressed air supply to the air nozzle 21, a compressed air bore 36 extending through a handle 2 of the gun body 1 to the piston bore 33, and a pressure sensing and pressure display device 45 arranged in the handle 2, wherein a tube 38 spaced apart from the inner wall of the compressed air bore 36 is arranged, which forms an internal channel 53 for the compressed air supply to a part of the piston bore 33 arranged upstream of the compressed air valve 31, 32, and between its outer side and the inner wall of the Compressed air bore 36 limits an intermediate space 39,which is connected via a first connecting channel 50 to a pressure chamber 28 arranged downstream of the compressed air valve 31, 32 and via a second connecting channel 52 to a pressure measuring chamber 46 in the handle 2, which is associated with the pressure sensing and pressure display device 45. In contrast to previous state of the art, this solution is intended to enable not merely the measurement of the inlet pressure, but also the measurement of the injection pressure.

[0009] DE 10 2009 020 194 A1 discloses a spray gun comprising a gun body 1, a nozzle assembly 9 arranged on the gun body 1, a compressed air supply channel 22, 23 arranged in the gun body 1 with a valve assembly 17 for controlling the compressed air supply to the nozzle assembly 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, characterized in that the pressure measuring device 35 is detachably attached to the device 31, 33, 37, 42, 40 for regulating the compressed air supply. This is intended to prevent the pressure measuring device from becoming dirty or damaged during cleaning and to facilitate easy battery replacement when using a digital pressure gauge.

[0010] The solutions have proven themselves over many years. Nevertheless, these solutions only allow for an approximate measurement of the actual injection pressure.

[0011] The 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 spraying pressure can be determined more accurately than in the prior art.

[0012] The problem is solved 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, with the features of claim 1.

[0013] A spray gun can be, in particular, a gravity-feed spray gun, a drop-feed spray gun, a side-feed spray gun, or a kettle spray gun. A spray gun can be used, in particular, for spraying liquid media, especially paint or varnish.

[0014] The fact that the air chamber for supplying the air nozzle with air is located upstream of the air nozzle or at least one air outlet opening of the air nozzle means, in this case, that the air chamber is located directly behind the air nozzle and that the air flowing from the air chamber flows directly through the at least one air outlet opening of the air nozzle. 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 a single component of the spray gun or by several components. In particular, the air chamber can be formed by the air nozzle; for example, the air chamber can be designed as a milled recess or bore in the air nozzle. Generally, the air chamber is preferably a cavity that is directly adjacent upstream to an air outlet opening in the air nozzle.Upstream, in this context, means against the airflow. More than one air chamber may be present; in particular, two, three, or four air chambers may be present. Specifically, at least one air chamber may be for air used to atomize a material to be sprayed, at least one air chamber, preferably two, for air used to modify the shape of a spray jet, and / or at least one air chamber for air used to transport an atomized spray medium. The air chambers preferably border upstream of the respective air outlet opening responsible for the discharge of the respective air.An air chamber for air for atomizing a material to be sprayed is adjacent upstream to the air outlet opening for the outlet of atomizing air, the air chamber for air for changing the shape of a spray jet is adjacent upstream to the air outlet opening for the outlet of shaping air, and / or the air chamber for air for transporting an atomized spray medium is adjacent upstream to the air outlet opening for the outlet of transport air.

[0015] The air pressure prevailing in the air chamber during operation of the spray gun is specifically the so-called nozzle pressure. This is, in particular, the relative pressure with ambient pressure as the reference point. Operation of the spray gun is understood to mean that at least the air valve of the spray gun is open, allowing air, especially compressed air, to flow from an air inlet of the spray gun into the air chamber and to at least one air outlet of the spray gun. This state is usually achieved by lightly pulling the trigger of the spray gun. If the trigger is pulled further, the flow of the material to be sprayed is also activated, specifically by the extension of the paint needle from the material outlet of the nozzle. This state is also considered operation of the spray gun in this context.

[0016] The at least one device for inputting, adjusting, recording, determining, and / or displaying the air pressure prevailing in the air chamber during operation of the spray gun can be designed in a variety of ways. Several identical and / or several different devices can be provided, which can also be combined and / or interconnected, in particular interconnected by means of communication.

[0017] A device for inputting and / or adjusting the air pressure prevailing in the air chamber during operation of the spray gun can serve to define a specific setpoint for the air pressure or to communicate this value to a control and / or regulating device. The device for inputting and / or adjusting the air pressure prevailing in the air chamber during operation of the spray gun can, for example, be designed as a keypad, touchscreen, rotary dial, button arrangement, selector lever, or similar means.The device for inputting and / or adjusting the air pressure prevailing in the air chamber during operation of the spray gun can be located inside or on the spray gun; however, the device for inputting and / or adjusting the air pressure prevailing in the air chamber during operation of the spray gun, or another device for inputting and / or adjusting the air pressure prevailing in the air chamber during operation of the spray gun, can also be located outside the spray gun.

[0018] A device for detecting the air pressure in the air chamber during operation of the spray gun can serve to measure the actual air pressure and, if necessary, communicate this value to a control and / or regulating device and / or to a device for displaying the air pressure in the air chamber during operation of the spray gun. The device for detecting the air pressure in the air chamber during operation of the spray gun can, for example, be designed 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 identical and / or different types of 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.

[0019] A device for determining the air pressure prevailing in the air chamber during the operation of the spray gun differs from a device for detecting the air pressure prevailing in the air chamber during the operation of the spray gun in that, unlike the device for detecting the air pressure prevailing in the air chamber during the operation of the spray gun, the air pressure prevailing in the air chamber is not measured directly by the device for determining the air pressure prevailing in the air chamber during the operation of the spray gun, but is determined from other parameters, in particular calculated.To determine the air pressure prevailing in the air chamber of the spray gun during operation, various parameters can be used, such as 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, in particular a gun inlet pressure, a temperature, a flow velocity, a volume flow rate, a position of an attachment and / or a control element of the spray gun, such as a trigger guard and / or a rotary knob, a dimension of at least one part of the spray gun, in particular an air cap and / or a material nozzle, and / or another parameter. Measuring devices, in particular sensors, such as...Pressure measuring devices, in particular pressure sensors; temperature measuring devices, in particular thermometers or temperature probes; flow measuring devices, in particular flow sensors or flow meters, in particular flow meters or anemometers operating by means of an impeller, vortex or ultrasound, and / or thermal flow meters; 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. Some of the parameters, e.g. a nozzle size, can also be entered via an input device, which may be designed as a keyboard, touch display, rotary dial, button arrangement, selector lever, or have similar means. The input device can also be an identification and / or data acquisition device, such as...It may be designed as a barcode reader or RFID reader.

[0020] A device for displaying the air pressure prevailing in the air chamber during operation of the spray gun can serve to show an actual value and / or a target value for the air pressure. Preferably, this is an electrical or electronic display, in particular a screen or display, especially an LCD or OLED display, which is most preferably arranged in the main body of the spray gun. However, it can also be a mechanical or electromechanical display.

[0021] The aforementioned devices can be interconnected, in particular, they can communicate with each other. Communication between devices can take place, for example, via cables or wires, or wirelessly, e.g., via radio, satellite, Bluetooth, WLAN, ZigBee, NFC, Wibree, WiMAX, LoRaWAN and / or IrDA.

[0022] The air pressure prevailing in the air chamber during operation of the spray gun is in particular the so-called nozzle internal pressure.

[0023] The pressure measuring device can, for example, be arranged on the spray gun in place of a device for regulating the air supply, in particular in place of an air micrometer. However, it can also be arranged at the lower end of the spray gun handle, 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.

[0024] A method for designing a spray gun, which is not claimed, in particular a hand-held compressed air atomizing paint spray gun, in particular a spray gun described above and below, wherein the spray gun has at least one air nozzle 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, in particular one located upstream of the air nozzle.An air chamber adjacent to at least one air outlet opening of the air nozzle, in particular an air chamber formed by a material nozzle of the spray gun and an air cap of the spray gun, for supplying the air nozzle with air, may at least include the determination of a deviation between a first air pressure prevailing inside the spray gun at a first position during operation of the spray gun and a second air pressure prevailing inside the spray gun at a second position during operation of the spray gun, wherein the first position is inside the air chamber and wherein the second position is outside the air chamber.

[0025] The initial air pressure within the spray gun at a specific point, namely within the air chamber that supplies the air nozzle, can be measured using a test air cap. This is a special air cap that replaces the standard air cap on the spray gun. The test air cap typically has two pressure gauges: one connected to the atomizing air supply via a bore in the cap, and the other connected to the horn air supply via another bore. The spray gun cannot be used properly with the test air cap in place. However, the initial air pressure can also be measured using another pressure measuring device that is temporarily attached to the air nozzle or within the air chamber.

[0026] The second air pressure, which prevails inside the spray gun at a second position, wherein the second position is located outside the air chamber for supplying the air nozzle with air, can be measured with a pressure measuring device, in particular a pressure sensor, which is also temporarily or permanently arranged at the measuring position.

[0027] The deviation between the first and second air pressures, i.e., the deviation between the air pressure inside the air chamber and the air pressure outside the air chamber, can depend, in particular, on the magnitude of the air pressure, especially the magnitude of the second air pressure. Thus, a high air pressure can cause a large deviation. The method may include recording at least one characteristic curve that, for example, shows the first air pressure as a function of the second air pressure and / or a pistol inlet pressure, and / or shows the deviation between the first and second air pressures as a function of the first and / or the second air pressure and / or the pistol inlet pressure. The recording, i.e., in particular the creation, documentation, and / or storage of the characteristic curve, can be done manually or automatically.

[0028] A manual measurement can be performed, for example, by setting the second air pressure to a first, relatively low, value and measuring and recording the first air pressure. Then, the second air pressure is set to a second value that is slightly higher than the first, and the first air pressure is measured and recorded again. Afterward, the second air pressure is set to a third value that is again slightly higher than the second, and the first air pressure is measured and recorded once more. This process can be continued until the maximum permissible pressure is reached. If the measurement 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, a characteristic curve is obtained that shows the first air pressure as a function of the second air pressure.

[0029] An automatic recording of the characteristic curve can be carried out in essentially the same way as a manual characteristic curve, whereby the setting of the values ​​for the second air pressure and the measurement and documentation of the associated values ​​for the first air pressure are each carried out by one or more devices, in particular independently.

[0030] The deviations, the series of deviations and / or the characteristic curve can of course also be obtained using computer simulation methods.

[0031] The deviation between the first and second air pressures, i.e., 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., the material nozzle and / or the air nozzle used, in particular the type and / or at least one dimension of the material nozzle and / or the type and / or at least one dimension of the air nozzle used, in particular the so-called nozzle size, and / or whether the nozzle or nozzle set is, for example, an HVLP nozzle, a compliant nozzle, or a conventional nozzle. Preferably, a separate characteristic curve is recorded for several, in particular all, possible nozzles and / or nozzle sets that can be used, i.e., arranged in or on the spray gun. A nozzle set generally consists of a material nozzle, an air nozzle, and a paint needle.

[0032] If the deviation between the first and second air pressures, i.e., the deviation between the air pressure inside the air chamber and the air pressure outside the air chamber, is known, possibly depending on the magnitude of the air pressure, in particular the magnitude of the air pressure outside the air chamber, and / or depending on the nozzle, or if the characteristic curve described above is known, especially for a specific nozzle, then it is sufficient to measure the air pressure outside the air chamber and 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. Therefore, a device for measuring the air pressure inside the air chamber can be dispensed with during operation of the spray gun.This simplifies the manufacture of the paint gun and prevents disturbances to the airflow in the air chamber that could be caused by a device for measuring the air pressure within the air chamber.

[0033] The method may, 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 within the air chamber, in particular a first pressure sensor, is arranged in or on the spray gun, 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, wherein the second device for detecting a second air pressure, in particular the second pressure sensor, is arranged in the spray gun in such a way that it is connected to an air duct within the spray gun.Subsequently, it can be provided that compressed air is supplied to the spray gun, a first air pressure inside the air chamber and a second air pressure outside the air chamber are measured, and the deviation between the first and second air pressures is determined. In particular, a characteristic curve can be recorded as described above. The series of deviations or the characteristic curve, preferably linked with information about the nozzle or nozzle set used, is stored in a data processing device described in more detail below, which can also be considered an evaluation unit. This data processing device is or is connected to the second device for detecting a second air pressure, in particular the second pressure sensor, outside the air chamber. Preferably, the determination of deviations or theThe recording of characteristic curves for several different nozzles or nozzle sets is repeated, and the series of deviations or the characteristic curves are stored, preferably linked with information about the nozzle or nozzle set used, in the data processing device. Finally, the first device for detecting a first air pressure prevailing within the air chamber, in particular the first pressure sensor, can be removed from the spray gun. The data processing device is programmed such 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 by the deviation, which is then displayed by a device for displaying an air pressure, described in more detail below.This displays the air pressure in the air chamber, even though the air pressure was measured at a different point in the spray gun.

[0034] Of course, as an alternative to considering a series of deviations or the characteristic curve, only a single standard deviation can be taken into account. This means that the same value can always be subtracted or added to the air pressure measured by the device outside the air chamber in order to determine the air pressure inside the air chamber.

[0035] Advantageous embodiments are the subject of the dependent claims.

[0036] The spray gun according to the invention preferably further comprises an air cap with a central opening, wherein the central opening, together with a front region of the material nozzle, forms an annular gap for supplying air for atomizing a material to be sprayed, and wherein at least one air chamber is formed by the material nozzle and the air cap. The front region of the material nozzle is preferably designed as a hollow cylindrical cone, but it can also be, 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 supplying air for atomizing a material to be sprayed, the air cap can have further air outlet openings, in particular horn air or...The air cap may contain forming air inlets, which can be arranged in horns on the air cap and from which air flows to modify the shape of a spray jet (the so-called forming air), and / or control inlets, which may be located next to the central opening in the air cap and from which air flows to transport an atomized spray medium, particularly away from the spray gun and towards 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 may have further air chambers, which are designed, for example, as bores in the horns of the air cap. The air types can, of course, also serve purposes beyond those mentioned, in particular the re-atomization of the spray jet.

[0037] Particularly preferably, at least one device for detecting air pressure, in particular a pressure sensor, is arranged in the air chamber, especially on an inner surface of the air cap and / or on an outer surface of the material nozzle, which is wirelessly and / or wired connected and / or connectable to a device for controlling and / or regulating air pressure, in particular a mechanical, electronic and / or electromechanical device for controlling and / or regulating air pressure, and / or to a device for displaying air pressure and / or to a data processing device.

[0038] The device for detecting air pressure, in particular the pressure sensor, can be, for example, 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 be integrated into the inner surface of the air cap and / or the outer surface of the material nozzle in such a way that the inner surface of the air cap and the outer surface of the device for detecting air pressure, in particular the pressure sensor, essentially form a flat surface, or the outer surface of the material nozzle and the outer surface of the device for detecting air pressure, in particular the pressure sensor, essentially form a flat surface. That is, preferably the device for detecting air pressure, in particular the pressure sensor, does not project beyond the inner surface of the air cap or the outer surface of the material nozzle.In this way, disturbances to the airflow caused by the device for detecting air pressure, in particular the pressure sensor, can be avoided.

[0039] The device for controlling and / or regulating air pressure, in particular the device for controlling air pressure, can be designed using a simple mechanical rotary knob, wherein the rotary knob or a part arranged on it mechanically engages in an air duct, e.g., protrudes into it and / or at least partially covers it, in particular altering its flow cross-section. In this context, "control" refers in particular to an analog control without feedback. An advantage of such a control lies in its simplicity, especially its simple and therefore cost-effective design, which can also function without a measuring device. However, disturbances, e.g., a pressure drop, require manual intervention.

[0040] In contrast, a device designed to regulate air pressure can maintain a constant air pressure by continuously measuring the variable to be controlled (in this case, air pressure) and comparing it to the desired setpoint. An actuator, which can be part of the control device or a separate component, acts on the controlled system such that the actual value corresponds to the setpoint. The actuator(s) can be located in or on the spray gun, or they can be located away from the spray gun, for example, in or on an air hose, or in or on a compressor. Valves, orifices, or throttles, particularly those that can open and close, preferably continuously, can be suitable for this application.

[0041] The device for controlling and / or regulating air pressure is preferably designed as part of the spray gun and arranged on or in it, and the device for detecting air pressure, in particular the pressure sensor, is wirelessly and / or wired connected to it and / or connectable. However, it is also conceivable that the device for detecting air pressure, in particular the pressure sensor, is wirelessly and / or wired connected to a device for controlling and / or regulating air pressure located away from the spray gun.

[0042] The device for displaying air pressure can, for example, show the setpoint and / or the actual value of the air pressure. Preferably, the device for displaying air pressure is an electrical or electronic display, in particular a screen or display, especially an LCD or OLED display, which is particularly preferably arranged in the main body of the spray gun. However, it can also be a mechanical or electromechanical display. The device for displaying air pressure is preferably designed as part of the spray gun and arranged on or in it, and the device for detecting air pressure, in particular the pressure sensor, is wirelessly and / or wired connected to it and / or connectable to it.However, it is also conceivable that the device for detecting air pressure, in particular the pressure sensor, is wirelessly and / or wired connected to a device for displaying air pressure located away from the spray gun and / or connectable to it.

[0043] The data processing unit, which can also be considered an evaluation unit, can be designed as a microprocessor or incorporate a microprocessor, and / or it can be designed as a controller or incorporate a controller. The task of the data processing unit can be to acquire and process data or commands, in particular measured values, measurement data, or setpoints, and, if necessary, to output data, signals, or similar information. The data processing unit can, for example, be designed in such a way that it can access one or more of the characteristic curves described above, and thus determine, in particular calculate, the air pressure inside the air chamber from the air pressure prevailing outside the air chamber.

[0044] The aforementioned devices can be interconnected, in particular, they can communicate with each other. Communication between devices can take place, for example, via cables or wires, or wirelessly, e.g., via radio, satellite, Bluetooth, WLAN, ZigBee, NFC, Wibree, WiMAX, LoRaWAN and / or IrDA.

[0045] The spray gun according to the invention has at least one air channel for directing air, in particular compressed air, from an air inlet to an air outlet, wherein the spray gun further has at least one device for detecting air pressure, in particular a pressure sensor, which is arranged outside the air chamber, in particular within 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 further has a device for determining, in particular calculating, the air pressure prevailing in the air chamber during the operation of the spray gun based on the air pressure value determined by the device for detecting air pressure, in particular the pressure sensor.

[0046] The device for measuring air pressure can be designed, in particular, like the pressure measuring device described in the aforementioned DE 10135104 C1 or the aforementioned DE 10 2009 020 194 A1, and can be arranged in or on the spray gun like these pressure measuring devices. Depending on the embodiment, the pressure measuring devices described in the aforementioned publications measure either the gun inlet pressure or the air pressure in a pressure chamber near the air valve actuated by the trigger. However, the air pressure in this pressure chamber is not equal to the pressure in the air chamber; rather, there is a pressure difference.

[0047] 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. The aforementioned device can be designed and / or function like the data processing device or evaluation unit described above.Like the data processing device, the device can contain at least one of the deviations and / or at least one of the characteristic curves described above, and it can be programmed in such a way that it determines, in particular calculates, the air pressure inside the air chamber from the air pressure determined by the aforementioned device for detecting air pressure, which is arranged outside the air chamber and measures air pressure inside the spray gun but outside the air chamber, preferably depending on the amount of air pressure outside the air chamber and / or depending on the nozzle or nozzle set used.

[0048] The aforementioned device for measuring 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 measuring air pressure, in particular the pressure sensor, are interconnected, in particular communicating with each other. Communication between the devices can take place, for example, via cables or wires, or wirelessly, e.g., via radio, satellite, Bluetooth, WLAN, ZigBee, NFC, Wibree, WiMAX, LoRaWAN and / or IrDA.

[0049] Preferably, the spray gun according to the invention has at least one replaceable component, in particular a replaceable nozzle arrangement, in particular a replaceable material nozzle and / or a replaceable 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 determined as a function of at least one parameter of the replaceable component, in particular the replaceable nozzle arrangement, in particular the type of the replaceable component, in particular the replaceable nozzle arrangement, and / or at least one dimension of the replaceable component, in particular the replaceable nozzle arrangement, in particular at least one inner and / or outer diameter of an opening in the nozzle arrangement.The above statements regarding the deviation between the air pressure inside the air chamber and the air pressure outside the air chamber, depending on other factors, e.g., 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 aforementioned 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.

[0050] Preferably, the spray gun according to the invention has at least one replaceable component, in particular a replaceable nozzle arrangement, in particular a replaceable material nozzle and / or a replaceable air nozzle, and at least one device for acquiring information, in particular information about a type and / or dimension of the component arranged in the spray gun, in particular a nozzle size, and / or is wirelessly and / or wired connected and / or connectable to such a device.

[0051] Preferably, the device for recording information is part of the spray gun and is arranged in or on it.

[0052] The information acquisition device can be designed as a manual input device, e.g., a keyboard, touchscreen, rotary dial, button assembly, or selector lever, or it can incorporate such means. However, the information acquisition device can also be designed as an identification and / or data acquisition device, such as a barcode reader or RFID reader. In the latter case, the replaceable component, in particular the replaceable nozzle assembly, especially the replaceable material nozzle and / or the replaceable air nozzle, can have a barcode, in particular a barcode or a QR code, or an RFID chip or other marking and / or identification means that can be detected, in particular read, by the information acquisition device.The information acquisition device can be designed as part of, or connected to, the device for determining, in particular calculating, the air pressure prevailing in the air chamber during operation of the spray gun, in particular by means of wired and / or wireless communication. The information acquired by the information acquisition device can be used to determine, 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 air pressure detection device, in particular the pressure sensor. As described above, recorded deviations, series of deviations, and / or characteristic curves can be linked to information about the nozzle or nozzle set used. Depending on the information acquired by the information acquisition device, for example,Another deviation, series of deviations, and / or characteristic curve can be used to determine, in particular calculate, the air pressure prevailing in the air chamber during operation of the spray gun. For example, the spray gun manufacturer has installed a specific nozzle set in the spray gun, recorded a characteristic curve as described above, and linked the characteristic curve to the type of installed nozzle set. If the user of the spray gun uses the spray gun with this nozzle set, the information acquisition device recognizes this type of nozzle set, or the user enters the type of nozzle set into the information acquisition device, whereupon a device connected to the information acquisition device determines, in particular calculates, the air pressure prevailing in the air chamber during operation of the spray gun, or a data processing device, or...an evaluation unit that uses a characteristic curve associated with this type of nozzle set for determining, in particular calculating, the air pressure prevailing in the air chamber during operation of the spray gun, based on an air pressure measured outside the air chamber in the spray gun.

[0053] The device for recording information can also be seen as a device for identifying the component arranged in the spray gun.

[0054] As above, communication between the facilities can also take place here, for example, via cables or wires, or wirelessly, e.g., via radio, satellite, Bluetooth, WLAN, ZigBee, NFC, Wibree, WiMAX, LoRaWAN and / or IrDA.

[0055] Preferably, the spray gun according to the invention 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 connected and / or connectable to such a device.

[0056] Preferably, the device for regulating and / or limiting the air pressure prevailing in the air chamber during operation of the spray gun is part of the spray gun and is arranged in or on it.

[0057] 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 include at least one device for inputting a setpoint and / or a minimum value and / or a maximum value for the air pressure prevailing in the air chamber during operation of the spray gun and / or be wirelessly and / or wired connected and / or connectable to such a device. With the device for inputting a setpoint and / or a minimum value and / or a maximum value, a setpoint, a minimum value and / or a maximum value for the air pressure prevailing in the air chamber can be set 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 setpoint has been defined.

[0058] 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 adjust 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 nozzle pressure of 0.7 bar (10 psi) for HVLP spray guns.

[0059] Preferably, the spray gun according to the invention has at least one device for outputting a signal, in particular an optical, acoustic and / or haptic signal, which is connected and / or connectable to a device for determining, in particular calculating, the air pressure prevailing in the air chamber during operation of the spray gun, to a device for controlling and / or regulating and / or limiting an air pressure, to a device for displaying an air pressure and / or to a data processing device. By means of the device for outputting a signal, for example, a warning signal can be issued, e.g., a warning tone or a warning light, if the air pressure falls below a certain value, exceeds a certain value, or if strong pressure fluctuations are detected.

[0060] As above, communication between the facilities can also take place here, for example, via cables or wires, or wirelessly, e.g., via radio, satellite, Bluetooth, WLAN, ZigBee, NFC, Wibree, WiMAX, LoRaWAN and / or IrDA.

[0061] Preferably, the spray gun according to the invention 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 is arranged in the area of ​​the second outlet opening of the air nozzle, in particular in the area of ​​at least one molding air opening.This allows the air pressure, which is crucial for the quality of the atomization and the overall painting result, to be recorded and, in particular, measured as accurately as possible in the immediate vicinity of the air outlet openings.

[0062] A preferred embodiment of a pressure measuring device includes a device for acquiring information, in particular a manufacturer and / or model of a spray gun, a type and / or dimension of a component arranged in a spray gun, in particular a nozzle size, and / or is wirelessly and / or wired connected and / or connectable to such a device.

[0063] The above statements concerning the information acquisition device that the spray gun according to the invention may have also apply to the present information acquisition device. Furthermore, the present device can acquire the manufacturer and / or model of a spray gun as additional information. This can be done either manually or automatically when the pressure measuring device is attached to a spray gun. For example, contacts can engage during attachment to enable the information transfer.

[0064] The pressure measuring device preferably includes at least one display device, in particular for displaying a pressure value. This is most preferably a display, especially an LCD or OLED display.

[0065] Preferably, the pressure measuring device comprises at least one device for outputting a signal, in particular an optical, acoustic, and / or haptic signal, which is connected and / or connectable to a device for determining, in particular calculating, the air pressure prevailing in the air chamber during operation of the spray gun, to a device for controlling and / or regulating and / or limiting an air pressure, to a device for displaying an air pressure, and / or to a data processing device. The above descriptions concerning the device for outputting a signal, which the spray gun according to the invention may have, also apply to the present device.

[0066] The unclaimed method for designing a spray gun can include, as at least one further step, the design of a pressure measuring device for the spray gun, wherein the pressure measuring device is designed such that it takes into account, and in particular computationally takes into account, 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. The method particularly preferably includes at least the arrangement of the pressure measuring device, in particular the pressure sensor, at the second position. Reference is made to the above descriptions concerning the consideration of deviations and the arrangement of a pressure measuring device.

[0067] The invention is explained in more detail below using three figures as examples. These show: Fig. 1 a perspective view of an embodiment of a spray gun according to the invention, Fig. 2 a sectional view of the head area of ​​an embodiment of a spray gun according to the invention, and Fig. 3 a diagram showing an example of a characteristic curve that shows the air pressure inside an air chamber plotted against the air pressure outside an air chamber, as well as a characteristic curve that 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.

[0068] Fig. 1 Figure 1 shows a perspective view of an embodiment of a spray gun 1 according to the invention, comprising 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 this case includes an air cap 9 that is screwed onto the base body 3 of the spray gun 1 by means of an air nozzle ring 11. In the illustrated embodiment, the air cap 9 has two horns 13a, 13b, each with two horn air openings. It also has a central opening 15, which in this case, together with a material nozzle screwed into the base body 3, forms an annular gap. On two opposite sides of the central opening 15, several control openings 17 are provided. A material quantity control is arranged in the spray gun 1, which can be actuated via a material quantity control knob 19.A rear stop for the paint needle can be defined via the material flow control; that is, the material flow control allows adjustment of how far the paint needle can protrude from the material outlet opening of the material nozzle when the trigger lever 18 is actuated. This defines the maximum flow cross-section for the material flowing from the material outlet opening of the material nozzle and thus the amount of material sprayed by the spray gun 1.

[0069] The spray gun 1 also has a device by which the amount of air supplied by a Fig. 1 The air inlet channel arrangement, which extends upwards from the air inlet 4 through the handle of the spray gun 1 and flows into an upper part of the gun body 3, is adjustable. A so-called air micrometer can be used for this purpose, which in this case can be operated by means of an air micrometer rotary knob 21. The air micrometer can, for example, be designed as a sleeve with an opening in its wall, the degree of overlap of which with the opening of the air inlet channel arrangement is adjustable. In this way, the flow cross-section through which the air can flow from the handle area of ​​the spray gun 1 into an upper part of the gun body 3 can be adjusted.

[0070] The present embodiment of a spray gun 1 according to the invention has inside a Fig. 1 The first air outlet duct arrangement, not visible, and one in Fig. 1 The second air outlet channel arrangement, which is also not visible, is present. The first air outlet channel arrangement can be, in particular, an air outlet channel arrangement for directing air to atomize 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 directed by 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 be, in particular, an air outlet channel arrangement for directing air to change the shape of a spray jet. This air outlet channel arrangement can be referred to as a shaping air channel arrangement or a shaping air channel. The air directed by it can flow out of the shaping air openings 20 of the horns 13a, 13b and can be referred to as shaping air. Fig. 1 Visible is a round wide-beam 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 molding air duct arrangement.

[0071] The spray gun 1 also has a device comprising a display 29 for inputting and / or setting and / or detecting and / or determining and / or displaying the air pressure prevailing in an air chamber during operation of the spray gun 1. In the present embodiment, this device is for detecting and displaying the air pressure prevailing in an air chamber during operation of the spray gun and further comprises a device for detecting air pressure, in particular a pressure sensor.

[0072] The device for detecting air pressure, in particular the pressure sensor, detects, and in particular measures, the air pressure in a pressure chamber near the air valve actuated by means of the trigger lever 18. The device for determining the air pressure prevailing in an air chamber during the operation of the spray gun 1 determines, and in particular calculates, from this measured compressed air value at a position outside the air chamber adjacent to at least one air chamber upstream of an air outlet opening, the air pressure prevailing in the air chamber during the operation of the spray gun 1. This is done by taking into account, as described above, a known deviation and / or series of deviations between the air pressure values ​​and / or a characteristic curve, as described above, stored in the device for determining the air pressure prevailing in the air chamber during the operation of the spray gun 1.

[0073] The device for displaying the air pressure prevailing in the air chamber during the operation of the spray gun preferably displays the air pressure prevailing in the air chamber during the operation of the spray gun 1 by means of the display 29.

[0074] The spray gun 1 can also include a device for detecting air pressure, in particular a pressure sensor, which is arranged in the air chamber and which is connected wirelessly and / or via cable to a device for controlling and / or regulating air pressure and / or to a device for displaying air pressure and / or to a data processing device. The device for detecting air pressure, in particular the pressure sensor, can be arranged within 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 transmit it, for example, to a device for displaying air pressure, to which the device for detecting air pressure, in particular the pressure sensor, is preferably wirelessly connected. Thus, the air pressure prevailing in the air chamber during operation of the spray gun 1 can, for example, be displayed on the display.displayed on screen 29.

[0075] Fig. 2 Figure 1 shows a sectional view of the head region of an embodiment of a spray gun according to the invention. An air nozzle 5 is arranged on the head region of the base body 3, which in this case has an air cap 9 and an air nozzle ring 11. 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 forming air openings 20 each in horn 13a and 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 an annular gap with the central opening 15 for the outlet of atomizing air. The material nozzle 40 and the air cap 9 form a first air chamber 80. This is one of the air chambers whose prevailing air pressure is of particular interest in this case.In the air chamber 80, in the present embodiment on an inner surface of the air cap 9, a first device for detecting an air pressure 42 is arranged. The first device for detecting an air pressure 42 is partially recessed in the air cap 9. However, it can also be integrated 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.

[0076] A second air chamber 82, the air pressure of which is also of interest, is designed as a bore in horn 13a. A second device for measuring air pressure 43 is arranged in this bore. Horn 13b also has an air chamber designed as a bore, but in this case, it does not have a device for measuring air pressure. Generally, due to the symmetrical arrangement of the two horns 13a and 13b, and because they are supplied with air from the same mold air channel arrangement, it is not necessary to arrange a device for measuring air pressure in both horns 13a and 13b, since the pressure in both horns 13a and 13b is usually the same. Of course, it is also possible to arrange devices for measuring air pressure in both air chambers of horns 13a and 13b.

[0077] During operation of the spray gun, atomizing air, which flows from an atomizing air channel 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 magnitude of which is of interest here. If air is introduced into the molding air channel arrangement in the base body 3 of the spray gun 1, in particular by a [missing information] operated by the user of the spray gun 1 via a [missing information] in Fig. 1 The round-wide jet control knob 21, which allows the round-wide jet adjustment to be operated, directs this molding air from the molding air duct arrangement into the second air chamber 82 and from there through the molding air openings 20. The molding air thereby generates an air pressure in the second air chamber 82, which may also be of interest. The value measured by the first air pressure detection device 42 and / or the value measured by the second air pressure detection device 43 can be sent, for example, to a device for controlling and / or regulating an air pressure and / or to a device for displaying an air pressure and / or 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 Fig. 1 The display shown shows 29.

[0078] Fig. 3Figure 92 shows an example of a first characteristic curve, which plots the air pressure inside an air chamber against the air pressure outside the air chamber. The air pressure inside the air chamber is plotted along the vertical primary axis 94, and the air pressure outside the air chamber is plotted along the horizontal axis 95. The first characteristic curve 92 shows what air pressure exists inside an air chamber for a given air pressure outside the air chamber. For example, it can be seen that at an outside pressure of 0.5 bar, the pressure inside the air chamber is also 0.5 bar. At an outside pressure of 2.5 bar, the pressure inside the pressure chamber is only 2.3 bar. At an outside pressure of 5.0 bar, the pressure inside the pressure chamber is only 4.7 bar.

[0079] 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 the air chamber. The deviation was calculated from the difference between the air pressure outside the air chamber and the air pressure inside the air chamber. The deviation was plotted along the vertical secondary axis 96, while the air pressure outside the air chamber was plotted along the horizontal axis 95. It is evident that the deviation increases with increasing air pressure outside the air chamber. In reality, the deviation does not increase in steps as shown in the diagram, but rather follows a continuous rise. The step-like shape of the increase is due to the distance between the measurement points and the rounding of the measured values.

[0080] The described embodiments represent only a limited selection of possible designs and therefore do not constitute a limitation of the present invention.

Claims

1. Spray gun (1), in particular a compressed-air atomizing paint spray gun, in particular a hand-held compressed-air atomizing paint spray gun, having 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), in particular an air chamber (80, 82) adjacent to and upstream of the air nozzle (5) or at least one air outlet opening of the air nozzle (5), for supplying the air nozzle (5) with air, wherein the spray gun (1) further has at least one device for entering and / or adjusting and / or displaying the air pressure present in the air chamber (80, 82) during the operation of the spray gun (1), wherein the spray gun (1) further has at least one air channel for guiding air, in particular compressed air, from an air inlet (4) to an air outlet, wherein the spray gun (1) further has at least one device for measuring an air pressure (42, 43), in particular a pressure sensor, which device is arranged outside the air chamber (80, 82), in particular 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), characterized in that the spray gun (1) further has a device for determining, in particular calculating, the air pressure present in the air chamber (80, 82) during the operation of the spray gun (1) on the basis of the air pressure value determined by the device for measuring an air pressure (42, 43), in particular the pressure sensor.

2. Spray gun (1) according to claim 1, characterized in that it further has an air cap (9) with a central opening (15), wherein the central opening (15) together with a front region of the material nozzle (40) forms an annular gap for 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), there is arranged at least one device for measuring an air pressure (42, 43), in particular a pressure sensor, which device is connected in a wireless and / or wired manner to a device for open-loop controlling and / or closed-loop controlling an air pressure, in particular a mechanical, electronic, and / or electromechanical device for open-loop controlling and / or closed-loop controlling an air pressure, and / or to a device for displaying an air pressure, and / or to a data processing device.

4. Spray gun (1) according to any of the preceding claims, characterized in that it further 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), wherein the device for determining, in particular calculating, the air pressure present in the air chamber (80, 82) during the operation of the spray gun (1) is designed in such a way that the determining, in particular calculating, of the air pressure present in the air chamber (80, 82) during the operation of the spray gun (1) is determined, in particular calculated, on the basis of at least one parameter of the exchangeable component, in particular of the exchangeable nozzle arrangement, in particular the type of the exchangeable component, in particular of the exchangeable nozzle arrangement, and / or at least one dimension of the exchangeable component, in particular of the exchangeable nozzle arrangement, in particular at least one inner and / or outer diameter of an opening (15, 20) in the nozzle arrangement.

5. Spray gun (1) according to any 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 acquiring 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 in a wireless and / or wired manner to such a device.

6. Spray gun (1) according to any of the preceding claims, characterized in that it has at least one device for limiting and / or closed-loop controlling the air pressure present in the air chamber (80, 82) during the operation of the spray gun (1) and / or is connected and / or connectable in a wireless and / or wired manner to such a device.

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

8. Spray gun (1) according to any 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 device is connected and / or connectable to a device for determining, in particular calculating, the air pressure present in the air chamber (80, 82) during the operation of the spray gun (1), to a device for limiting and / or open-loop controlling and / or closed-loop controlling an air pressure, to a device for displaying an air pressure, and / or to a data processing device.

9. Spray gun (1) according to any 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), wherein the air nozzle (5) has at least one 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 shaping-air openings (20), for the outlet of shaping air, wherein at least one first device for measuring an air pressure (42) is arranged in the region of the first outlet opening of the air nozzle (5), in particular in the region of the central opening (15), and / or wherein at least one second device for measuring an air pressure (42) is arranged in the region of the second outlet opening of the air nozzle (5), in particular in the region of at least one shaping-air opening (20).

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