Spraying device

Abstract

The invention relates to a spray device, in particular for spraying a fluid, comprising a pressure-generating unit (13) for generating a fluid flow, a drive unit (15), in particular an electronically commutated drive unit, for driving the pressure-generating unit (13), a machine housing (51), a nozzle unit (17), in particular having a nozzle opening (27), for dispensing a fluid along a dispensing axis (Aa), and a holding element (101) for holding the nozzle unit (17), in particular in a form-fitting manner. It is proposed that the spray device comprise a spring element (103), in particular formed integrally with the holding element (101), for adjusting the nozzle unit (17), in particular a nozzle parameter of the nozzle unit (17), wherein the spring element (103) extends perpendicular to the dispensing axis (Aa).

Description

[0001] The invention relates to a spray device according to the preamble of claim 1. State of the art

[0002] Similar spray devices are known from the prior art. Disclosure of the invention

[0003] The invention is based on the object of improving a spraying device with simple constructive measures.

[0004] The object is achieved with a spraying device, in particular for spraying a fluid, with a pressure generating unit for generating a fluid flow, with a drive unit, in particular an electronically commutated drive unit, for driving the pressure generating unit.

[0005] In particular, the spray device has a nozzle unit for dispensing a fluid, in particular along a dispensing axis.

[0006] It is proposed that the nozzle unit is provided to spray a first fluid having a first viscosity in a first spray state and a second fluid having a second viscosity and different from the first fluid in a second spray state.

[0007] Traditionally, various interchangeable nozzle units were used to spray a first fluid with a first viscosity and a second fluid with a second viscosity. The various nozzle units were adapted to the fluids to be sprayed, meaning one nozzle unit was designed, for example, for a fluid containing emulsion paint, and another nozzle unit was designed, for example, for a fluid containing varnish. Using a fluid with a nozzle unit not designed for or suitable for that fluid might result in the fluid being sprayed. However, the required spray pattern could not be achieved.

[0008] With this spray device, both fluids can be sprayed using a single nozzle unit.

[0009] It is understood that the spraying of fluids should meet the usual requirements known and required in the field of existing spray devices. Thus, spraying should not be understood as merely the possibility of spraying – of any kind – but rather as spraying that meets the usual requirements in the field of spraying using such spray devices.

[0010] The nozzle unit can have a nozzle parameter. The nozzle parameter can set or change the spraying state. This allows a nozzle unit to be optimally adjusted for spraying a fluid, in particular such that different fluids can be sprayed with a single nozzle unit.

[0011] The spray state can be changed depending on the nozzle parameter. For example, the nozzle parameter can be set such that a first spray state is achieved. This allows only fluids with a low viscosity to be sprayed. For example, the nozzle parameter can be set such that a second spray state is achieved. This allows only fluids with a high viscosity to be sprayed.

[0012] The pressure generation unit can be designed as a blower unit, a compressor unit, a pump unit, or another pressure generation unit deemed appropriate by a person skilled in the art. The generated pressure is intended to apply a force or pressure to a fluid. The fluid to be sprayed can be conveyed by means of the pressure generation unit.

[0013] The drive unit can be provided for driving the spraying device, in particular the pressure generation unit. The drive unit can be provided for stimulating the pressure generation unit, by means of the drive energy, to generate the air volumes required for spraying a fluid onto a workpiece to be machined. The drive unit can be provided for providing the air flow required for spraying a fluid onto a workpiece to be machined, by means of the pressure generation unit. The drive unit can have an electric motor, in particular an electronically commutated electric motor, for generating the drive energy.

[0014] The nozzle unit can be provided for spraying a fluid onto a workpiece to be machined. The nozzle unit can have a nozzle element. The nozzle unit can have a fluid outlet opening for dispensing a fluid.

[0015] The pressure generation unit and the nozzle unit can be configured separately from one another. The pressure generation unit can be arranged on a side of the spray device facing away from the nozzle unit. The pressure generation unit and the nozzle unit can be fluidically connected to one another. The pressure generation unit can form an air stream designed to apply a force to a fluid in order to spray it. The pressure generation unit can generate an air stream that connects an air inlet into the spray device with an air outlet from the spray device.

[0016] The first fluid can be formed from a paint, in particular a wall paint. The first fluid can be formed from a commercially available wall paint, in particular for residential use. The first fluid can be formed as a coating material. The first fluid can be formed from a water base. The first fluid can be formed as an emulsion paint. The first fluid can be viscous or thin.

[0017] The second fluid may be formed from a varnish or a glaze. The second fluid may be liquid. The second fluid may contain a binder such as a resin, a dispersion or emulsion, a filler, a pigment, a solvent, and an additive such as a biocide.

[0018] The first and second fluids can have a viscosity between 0.02 and 3 Pa s. The first fluid should be closer to the upper limit and the second fluid closer to the lower limit.

[0019] The low-pressure spray process is typically used. This process involves spraying the material at a low pressure of up to around 0.7 bar and with a high air volume of around 50 liters per minute. Due to the low overspray, i.e., low overspray losses, this HVLP spray process achieves coating efficiencies of up to around 65% and is therefore superior to conventional processes, which achieve coating efficiencies between around 20 and 35%. A characteristic of the process is the air cone surrounding the material, which reduces overspray and the formation of paint overspray. This results in advantages such as paint savings and low solvent emissions, which are particularly environmentally friendly.

[0020] The spraying device may comprise a transport unit designed to transport fluid contained in the fluid container from the fluid container to the nozzle unit for spraying the fluid onto a workpiece to be machined. For this purpose, the transport unit may comprise a fluid guide element.

[0021] It may be expedient for the nozzle unit to have a fluid transport region for fluid transport. It may be expedient for the nozzle unit to have a needle element for controlling or regulating fluid transport through the nozzle unit, in particular the fluid transport region. The nozzle unit may have a nozzle element for dispensing the fluid. The nozzle element may have a nozzle opening. The fluid transport region may be designed as a (fluid) flow region. The fluid transport region may be delimited by a / the nozzle element and the needle element. The nozzle opening may have a circular cross-section. The nozzle opening may have a non-circular cross-section. The nozzle opening may have an annular cross-section. The fluid transport region may have a circular cross-section in a spraying state. The fluid transport region may have an annular cross-section in a spraying state.The needle element can be provided to limit the nozzle opening of the nozzle unit. The needle element can effect fluid transport by changing the nozzle opening. For example, the nozzle opening can be reduced or completely closed by means of the needle element, so that less or no fluid transport is possible. The needle element can be movably mounted in the nozzle unit. The needle element can be provided to adjust the size of the nozzle opening. The needle element can be movably mounted along a movement axis. The needle element can be movably mounted relative to the nozzle element. The needle element can be arranged in one, in particular in any, state (blocked state) in the nozzle unit, in particular the nozzle element.In one state, in particular in a blocking state, the needle element can pass through the nozzle unit, in particular the nozzle opening, in particular in such a way that the needle element extends from one side to a side of the nozzle element facing away from the side.

[0022] The needle element can be spring-loaded by means of a spring element. The spring element can be arranged at an end of the needle element facing away from the nozzle unit. The needle element can be preloaded toward the nozzle unit, in particular such that the needle element prevents or avoids fluid leakage in a blocked state.

[0023] The needle element can have a taper or a needle tip, particularly at one end. The taper can be adapted to the nozzle opening. The taper can be configured such that the taper, in interaction with the nozzle unit, particularly the nozzle opening, is adapted to the fluid in the first spray state or the first viscosity and to the fluid in the second spray state or the second viscosity.

[0024] The fluid transport can be greater in a first spray state than in a second spray state. This can be achieved, for example, by moving / displacing the needle element in a direction opposite to the nozzle element or nozzle opening. This can provide a larger flow-through area. In particular, the nozzle opening can be larger in a first spray state than in a second spray state.

[0025] As the distance between the needle element and the nozzle element or the nozzle opening increases, the fluid transport area between the needle element and the nozzle element can be enlarged, particularly due to geometry. This allows more fluid to be provided for spraying.

[0026] It may be expedient for the nozzle unit to have a guide element, in particular designed as a guide elevation, for guiding a / the needle element. The fluid transport region can be delimited by the guide element. The guide element can be arranged at or adjacent to a nozzle opening of the nozzle unit. The guide element can position the needle element, in particular centrally, opposite the nozzle opening. The guide element can surround the needle element in sections. The guide element can extend, in particular axially, along the needle element. The guide element can extend radially to the needle element. The guide element can be designed as a guide rib. The guide element can delimit the nozzle unit. The guide element can delimit a / the fluid transport region, in particular a flow volume. It is understood that a single or a plurality of guide elements can be provided.The guide element can be provided to align the needle element such that a central axis of the needle element coincides with a central axis of the nozzle unit or the fluid outlet opening. The central axis can coincide with a discharge axis along which the fluid is discharged. The central axis and the discharge axis can be arranged coaxially, particularly in an operating state.

[0027] The guide element can delimit the fluid transport area in the circumferential direction around the needle element. The guide element can direct a fluid flow. The guide element can protrude in a direction along the central axis and / or transversely, in particular perpendicularly, to the central axis.

[0028] The guide element can be provided to define a fluid gap of the nozzle unit. The fluid gap can be defined by the needle element and the nozzle element. The guide element can have a main extension that is transverse to the central axis.

[0029] It is proposed that the nozzle element be conical, with the guide element being arranged in an inner region of the nozzle element. The guide element can be provided to position the nozzle element relative to the needle element axially along the central axis and / or radially to the central axis. The guide element can protrude in a direction pointing toward the central axis.

[0030] The guide element can form a conical contact area for the needle element.

[0031] The needle element can be arranged on the guide element in one, in particular in each, spraying state and in particular contact the latter.

[0032] It may be expedient for the spray device to have an opening-limiting unit for limiting, in particular, a movement of the needle element. The opening-limiting unit can be provided to adjust a / the first spray state relative to a / the second spray state. The opening-limiting unit can be connected, in particular coupled, to the needle element. The opening-limiting unit can limit a maximum movement of the needle element. The opening-limiting unit can form a bottom dead center of a movement of the needle element. The opening-limiting unit can be provided to guide the needle element along the nozzle unit, in particular along the guide element. The needle element can be guided by the guide element or contacted by it in every spray state. The opening-limiting unit can be preloaded, in particular by means of a spring element.The opening limiting unit can be arranged on the machine housing and in particular extend through the machine housing.

[0033] The opening limiting unit can have a stop element for limiting, in particular, a movement of the needle element. The stop element can be adjustable. The stop element can be designed as a gradient element / jump element. The gradient element can have a particularly substantially constant gradient. The gradient element can be curved. The gradient element can extend around an axis, in particular an operating axis. The gradient element can be rotatably mounted about an axis. The gradient element can limit a movement of the actuating element, in particular by means of the set gradient. The stop element can be arranged on the machine housing and, in particular, be movably mounted.

[0034] The opening limiting unit may have a locking element. The locking element may be provided to provide locking positions for the opening limiting unit. The locking element may be provided to maintain a set locking position.

[0035] The opening limiting unit can have an operating element for operating the opening limiting unit. The operating element can form an operating function. The second operating element can be provided for changing, in particular for changing, at least one parameter for conveying a fluid. The operating element can be provided for changing at least one parameter for conveying a fluid by changing a speed of the drive unit or by changing a pressure generation parameter of the drive unit. The operating element can be designed as an adjusting wheel. The operating element can be arranged on a machine housing of the spray device, in particular so as to be rotatable about an axis. The operating element can be formed integrally with the stop element. The operating element can be arranged on the machine housing.This allows an opening to be limited to suit the fluid to be used, thus enabling an optimal spray pattern.

[0036] It may be expedient for the spray device to have an actuating element for actuating the spray device.

[0037] It may be expedient for the actuating element to be movably mounted on the machine housing of the spray device, in particular about an actuating axis. The actuating element may have an actuating region for actuating the spray device. The needle element may be arranged between the actuating region and the actuating axis.

[0038] The actuating element can be provided to be actuated during an actuation process to input at least one input variable. The actuating element can be provided to receive an input variable from an operator during an actuation process. The actuating element can be provided to be contacted, in particular directly or indirectly, by an operator. The actuating element can be designed as an electrical and / or mechanical actuating element. The actuating element can be provided to be moved when actuated by an operator. The actuating element can be provided to transition from a first functional state to a second functional state. The actuating element can be provided to activate and / or deactivate the drive unit. The actuating element can be provided to switch the drive unit on and / or off.The actuating element can be provided for switching an on / off switch element on and / or off. The actuating element can be provided for changing a rotational speed of the drive unit or for changing a pressure generation parameter of the drive unit.

[0039] It may be expedient for the spray device to have a spring element for returning the needle element and / or the actuating element from an actuated state. The spring element can be arranged on the needle element. The spring element can preload the needle element.

[0040] It may be expedient for the spray device to have a first air guide channel and a second air guide channel, with the limiting element and / or the actuating element being arranged between the two air guide channels. In particular, the air guide channels open into a single air guide channel.

[0041] The spray device may have an actuating unit for actuating the spray device. It may be expedient for the spray device to have an electronic unit for controlling or regulating the speed of the drive unit. The electronic unit may be provided to adjust the speed of the drive unit depending on the actuation of the actuating unit.

[0042] It may further be expedient for the spray device to have a fluid receiving unit, in particular a fluid container, for receiving and / or storing a fluid. The fluid receiving unit can be designed as a hollow volume. The fluid receiving unit can receive a fluid. The fluid receiving unit can dispense a fluid. The fluid receiving unit can have an open area. The fluid receiving unit can be connectable to the machine housing. The fluid receiving unit can have a screw closure element for connecting the fluid receiving unit to the machine housing. The fluid receiving unit can be surrounded by the machine housing in a connected state. In a connected state, the fluid receiving unit can have a fixed end and a free end facing away from the fixed end. The fluid receiving unit, in particular the free end, can form a parking section for parking / supporting the spray device.

[0043] It may also be expedient for the spray device to have a supply opening for generating an air flow into the fluid receiving unit. The supply opening may be surrounded, in particular completely, by the machine housing in a connected state. The supply opening may be arranged on a machine housing. The air supply opening may be arranged in the fluid receiving unit in a connected state.

[0044] It may also be expedient for the spray device to have a sealing element to prevent backflow of the fluid. The sealing element may be provided to cover the supply opening. The sealing element may form part of a check valve, which is provided to prevent backflow of air or paint into the air duct. The sealing element may be elastic. The sealing element may be formed from a foam, in particular a closed-cell foam.

[0045] It may also be expedient for the sealing element to be arranged on the fluid receiving unit, in particular a receiving opening of the fluid receiving unit. In a connected state, the sealing element can extend along the receiving opening and / or cover it, in particular completely. The sealing element can be provided to seal the fluid receiving unit. In a connected state, the sealing element can be arranged between the machine housing and the fluid receiving unit. In a connected state, the sealing element can be surrounded by the machine housing, in particular in a plane of 360°. The sealing element can be designed as a sealing plate. The sealing element can be annular.

[0046] It may also be expedient for the sealing element to be designed in such a way that the sealing element is elastically deflected when air flows in through the supply opening.

[0047] It may also be expedient for the spray device to have a fluid transport element, in particular a tubular one, for transporting the fluid from the fluid receiving unit. The fluid transport element can be provided to create a fluidic connection from the fluid receiving unit to the machine housing. The fluid transport element can be designed as a dip tube element. The fluid transport element can be accommodated, in particular completely, in the fluid receiving unit in a connected state. The fluid transport element can be connectable to the machine housing. The fluid transport element can surround the machine housing, in particular in a plane by 360°. The fluid transport element can be arranged in a plane between an outer part of the machine housing and an inner part of the machine housing.In a connected state, the fluid transport element can be surrounded, in particular completely, by the machine housing and / or by the fluid receiving unit, in particular in a plane by 360°.

[0048] It may also be advantageous for the fluid transport element to have a retaining groove for retaining the sealing element. The retaining groove can receive and retain the sealing element at a central recess in the sealing element. The retaining groove can extend circumferentially around the fluid transport element.

[0049] The supply opening can be arranged, in particular laterally, on the fluid transport element. The supply opening can extend, in particular, through the entire material thickness of the fluid transport element. The supply opening can be arranged on or in the air inlet region. The supply opening can be arranged on a retaining groove of the fluid transport element. The retaining groove can be surrounded, in particular completely, by the sealing element.

[0050] It may also be expedient for the fluid transport element to be arranged between the machine housing and the fluid receiving unit. It may also be expedient for the fluid transport element to have an air inlet region and a fluid outlet region. The air inlet region can surround the fluid outlet region, in particular completely. The air inlet region can be pot-shaped. The air inlet region can be delimited, in particular in a connected state, in particular in the radial direction, on the one hand by the transport element and on the other hand by the machine housing. The fluid outlet region can be arranged, in particular in a connected state, between the air inlet region and a fluid inlet region.

[0051] The spraying device may comprise a machine housing and a cover unit for covering the machine housing.

[0052] It may be expedient for the spraying device to have a machine housing and a cover unit covering the machine housing, wherein the cover unit, in particular a cover element of the cover unit, covers / covers a pressure generating unit, in particular an air inlet opening of the pressure generating unit.

[0053] The pressure generation unit can have an air inlet and an air outlet. The pressure generation unit can take in air through the air inlet and discharge it through the air outlet. The pressure generation unit can be designed to compress air. The air at the air outlet can have a higher air pressure and / or a higher flow velocity than the air at the air inlet.

[0054] The cover unit can be arranged at a distance from the pressure generation unit. The cover unit can cover a projected area of ​​the air inlet opening. The projected area can be formed as a parallel surface of the air inlet opening, which is arranged substantially perpendicular to the surface of the air inlet opening. A surface of the air inlet opening projected at the level of the cover element can be covered by the cover element.

[0055] The cover unit, in particular the cover element, can be formed, in particular entirely, from an air-impermeable material. The cover unit can be formed from a plastic material.

[0056] The cover unit can be designed to reduce noise emissions, for example, by reducing, in particular reflecting, the noise generated by the pressure generation unit or escaping from the air inlet opening by means of the cover unit. The sound is deflected and redirected several times by the cover unit. This allows an air flow to be provided to the pressure generation unit, while also reducing noise emissions.

[0057] It may be expedient for the cover element to be designed at a distance from the pressure generating unit, in particular from the air inlet opening.

[0058] It may be expedient for the cover element to have an extension that is greater than the extension of the air inlet opening, in particular parallel to a surface of the air inlet opening. The cover element can span the air inlet opening, in particular completely.

[0059] It may be expedient for the cover element to be curved, in particular dome-shaped, in particular in at least one plane. The cover element may have a hollow cylindrical section. The cover element may have a spherical shell-shaped, in particular hollow spherical, section. The spherical shell-shaped section may adjoin the hollow cylindrical section.

[0060] It may be expedient for the cover unit to have a filter element for filtering the incoming air flow, wherein the filter element surrounds the cover element, in particular in a plane by 360°. The filter element can delimit the cover element. The filter element can have a honeycomb structure. The filter element can be provided to reduce the penetration of dust and dirt into the spray device or the machine housing. This can prevent damage to the pressure generation unit. The filter element can be designed as an air filter, in particular a conventional one.

[0061] It may be expedient for the cover element to protrude from the filter element. The cover element can delimit the filter element. The cover element can be cylindrical in sections. The cover element can be circular spherical segment-shaped in sections. The cover element can delimit a hollow volume. The hollow volume can be formed opposite the air inlet opening.

[0062] It may be expedient for the pressure generating unit to have an air outlet opening which is arranged on a side of the pressure generating unit facing away from the air inlet opening, wherein the air outlet opening is smaller than the air inlet opening.

[0063] It may be expedient for the spray device to have an air duct in which the pressure generating unit is arranged. The pressure generating unit can be completely surrounded by the air duct, in particular in a plane around 360°. The pressure generating unit can protrude from the air duct, in particular in the axial direction.

[0064] It may be expedient for the air duct to be designed as a bearing element for supporting the pressure generating unit.

[0065] It may be expedient for the spray device to have an air duct and a sealing element. The sealing element may be provided to seal the air duct from the pressure generating unit arranged in the air duct.

[0066] The sealing element can be arranged in the air duct and / or surrounded by it.

[0067] It may be expedient for the spray device to have a bearing opening that supports the pressure generation unit, in particular in the radial direction. The bearing opening can accommodate the pressure generation unit. The bearing opening can surround the pressure generation unit, in particular completely, in particular in a plane by 360°. The bearing opening can separate an air inlet flow at the air inlet opening from an air outlet flow at the air outlet opening by means of the pressure generation unit.

[0068] It may be expedient for the bearing opening to be delimited by a bearing rib arranged between an air inlet opening and an air outlet opening of the pressure generating unit. The air inlet opening may be arranged on a side facing away from the air outlet opening. The pressure generating unit may extend through the bearing opening. It may be expedient for the pressure generating unit to partially protrude from the air duct.

[0069] It may be expedient for the pressure generating unit to have a, in particular radial, elevation which supports the pressure generating unit at the bearing opening, in particular in the axial direction.

[0070] It may be expedient for the sealing element to be arranged, in particular in the axial direction, between the, in particular radial, elevation and the bearing opening.

[0071] It may be expedient for the sealing element to be arranged between the pressure generation unit and an air duct wall. The sealing element can be designed as an O-ring.

[0072] In particular, the spray device has a holding element for holding the nozzle unit, in particular in a form-fitting manner.

[0073] It is proposed that the spray device comprise a spring element, in particular formed integrally with the retaining element, for adjusting the nozzle unit, in particular a nozzle parameter of the nozzle unit. In particular, the spring element extends perpendicular to the dispensing axis. The spray device preferably comprises a spring element for adjusting the nozzle unit, in particular a nozzle parameter of the nozzle unit. "Integral" is to be understood in particular as being connected at least by a material bond, for example by a welding process, an adhesive process, an injection molding process, and / or another process deemed appropriate by a person skilled in the art, and / or advantageously as being formed in one piece, for example by being manufactured from a single casting and / or by being manufactured using a single-component or multi-component injection molding process, and advantageously from a single blank.

[0074] The retaining element can be substantially annular. The retaining element can have a recess, particularly a central recess. The recess can extend through the entire retaining element. The recess can be formed as an opening.

[0075] It may be expedient for the holding element to have a stop element for positioning an arrangement of the holding element relative to the machine housing. The stop element can be provided to limit a rotational movement of the holding element about the output axis. The stop element can have a stop surface that extends transversely, in particular perpendicularly, and along the output axis.

[0076] It may also be expedient for the retaining element to have a threaded element for connecting the retaining element to the machine housing. The threaded element can be designed as an internal thread. The threaded element can be limited by the spring element, viewed along the output axis. To create a screw connection, the machine housing has a further threaded element, in particular an external thread. The further threaded element is formed on a hollow cylindrical extension of the machine housing and surrounds it in the circumferential direction.

[0077] The spring element can be designed as a material spring. The spring element can be made of a plastic material. The spring element can be operatively connected directly or indirectly to the machine housing. The spring element can be designed as a tension and / or compression spring element. The spring element can apply a spring force along the discharge axis to the nozzle unit. The spring element can be provided to apply a spring force to the nozzle unit in order to hold the nozzle unit to the machine housing. The spring element can be designed as a bending spring element. The spring element can be designed as a plate segment spring element. The spring element can be designed as a leaf spring element. The spring element can be formed integrally with the holding element. The spring element can have a fixed end and a loose end facing away from the fixed end.The fixed end can be arranged on an inner side of the holding element, viewed perpendicular to the dispensing axis. The loose end can be arranged closer to the dispensing axis than the fixed end. The spring element can be designed as a clamping wing. The spring element can limit an extension of the holding element perpendicular to the dispensing axis. The spring element can be designed essentially as a circular segment. The spring element can limit the recess of the holding element.

[0078] The spring element may have a projection at its loose end. The projection may be provided to form a contact area, in particular a contact surface, a contact line, and / or a contact point, with the nozzle unit.

[0079] The spring element allows the nozzle unit to be optimally adjusted. This compensates for tolerance-related installation play in the nozzle unit and reduces or prevents the associated air leaks. Furthermore, it allows for mobility, particularly rotation, of the nozzle unit or its elements relative to each other.

[0080] The nozzle parameter of the nozzle unit can be considered to be the rotatability of the nozzle unit or the elements of the nozzle unit relative to each other. The nozzle parameter of the nozzle unit can be considered to be air tightness.

[0081] The operating state of the nozzle unit can be regarded as a nozzle parameter.

[0082] The nozzle unit can be arranged, in particular clamped, between the holding element and the machine housing.

[0083] It may be expedient for the nozzle unit to have a nozzle element for dispensing a fluid. It may be expedient for the nozzle unit to have an air cap element that is rotatably mounted relative to the nozzle element for dispensing an air stream. The air cap element can be rotatably latched relative to the nozzle element in one operating state. It may be expedient for the nozzle element to have a locking element for a latchable arrangement of the air cap element. The air cap element can be arranged so as to be latched relative to the nozzle element in a first, second, and / or third operating state. The nozzle element can have a locking geometry. The locking geometry can have a plurality of locking elements. The locking elements can define locking positions. The locking element can be designed as an uneven surface that counteracts movement. The locking element can be designed as a locking recess.For example, the nozzle unit can form a first locking position in a first operating state. Additional locking positions can be provided depending on the other operating states.

[0084] In an operating state, the nozzle element can be provided to receive the air cap element. Preferably, the nozzle element surrounds the air cap element, in particular in a plane by 360°. In an operating state, the nozzle element preferably extends through the air cap element, in particular through a central region of the air cap element.

[0085] It may also be expedient for the spray device to have an air cap element for discharging an air stream. The air cap element can be held, in particular preloaded, relative to the machine housing by means of the spring element, in particular indirectly or directly. The spring element can preload the air cap element toward the machine housing.

[0086] It may also be expedient for the air cap element to have a support element for supporting the air cap element relative to the nozzle element. The support element can extend and protrude laterally, in particular perpendicular to the dispensing axis. The support element can limit an extension of the air cap element perpendicular to the dispensing axis. The support element can serve as a support for the air cap element. In particular, the support element is arranged on a circumferential side, in particular a circumferential surface, of the air cap element. The support element can protrude relative to the circumferential surface.

[0087] The support element can be designed as a locking element. The support element can be designed to contact the locking geometry of the nozzle element. The support element of the air cap element can be designed to couple to the locking geometry. The locking geometry can be designed to receive the support element. The support element can be lockable relative to the locking geometry, in particular the locking recesses, in a first locking position and a further locking position. The support element can be movably mounted relative to the nozzle element, in particular a collar region of the nozzle element.

[0088] The air cap element can have a deflection element. The deflection element can be provided to deflect an air flow. The deflection element can be provided to align an air flow in a direction transverse to the output axis. The deflection element can have a deflection outlet opening. The deflection outlet opening can be substantially elliptical in cross-section. The deflection outlet opening can be drop-shaped in cross-section. The deflection outlet opening can be tapered or narrowed in cross-section when viewed in the direction of the output axis. The deflection outlet opening can have a first end facing the output axis and a second end facing away from the output axis. The deflection outlet opening can have a radius at the first end which is smaller than a radius at the second end.This allows an air flow to be provided through the deflection outlet opening, which provides an optimized flow velocity.

[0089] The deflection element can have an airflow channel that extends substantially along the discharge axis through the entire air cap element. The airflow channel can be curved. The airflow channel can have a substantially rectilinear section that extends along the discharge axis. The airflow channel can have another substantially rectilinear section that extends transversely to the discharge axis. The deflection discharge opening can have an opening area delimited by the deflection discharge opening, which opening area is arranged at a flow end of the airflow channel. The opening area can be oriented transversely to the discharge axis.

[0090] The deflection element can extend along the output axis. The deflection element can be designed as a deflection elevation. The deflection elevation can limit an extension of the air cap element along the output axis. The deflection elevation can protrude along the output axis. The deflection elevation can be arranged off-center. The deflection elevation can be arranged at a distance from the output axis. The deflection elevation can have a side surface actuatable by an operator. The side surface can extend substantially along an axial plane. The deflection elevation can be provided to rotate the air cap element about the output axis.

[0091] The air cap element may have a flow recess, particularly a centrally arranged one. The flow recess may be designed to accommodate the nozzle element in an operating state.

[0092] The deflection element can be provided to engage through the holding element in an operating state.

[0093] It may be expedient for the nozzle element to have a locking element for a lockable arrangement of the air cap element. It may be expedient for the nozzle element, in an operating state, to be provided to receive the air cap element and to surround it circumferentially around the dispensing axis.

[0094] It may be expedient for the nozzle element to be connected to the machine housing in a rotationally fixed manner. The machine housing may have a receiving recess provided for receiving and rotationally fixedly supporting the nozzle element. The receiving recess may be arranged on an inner side of the extension of the machine housing. The receiving recess may be provided for receiving a receiving elevation of the nozzle element along the discharge axis. The receiving recess may delimit the machine housing along the discharge axis and perpendicular to the discharge axis.

[0095] It may also be expedient for the retaining element to be connectable to the air cap element, in particular connectable in such a way that the retaining element adjusts, in particular rotates, the air cap element from one operating state to another operating state, in particular in an adjustable manner. A movement, in particular a rotational movement, of the air cap element can be limited in the circumferential direction around the output axis. A movement of the air cap element can be limited in the circumferential direction by the spring element.

[0096] The spring element can have a limiting element in the circumferential direction, which is intended to limit a movement, in particular a rotational movement, of the air cap element, in particular of the deflection element. The spring element can provide an adjustment range or a rotation range of the air cap element and limit this in the circumferential direction about the output axis by the limiting element. The rotation range can enable a rotation angle of approximately 90°. The limiting element can limit an extension of the spring element in the circumferential direction about the output axis. The spring element can have a further limiting element, which is arranged on a side of the spring element facing away from the limiting element.

[0097] The further limiting element can be designed analogously to the limiting element. Short description of the drawings

[0098] Further advantages will become apparent from the following description of the drawings. The drawings illustrate exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will also conveniently consider the features individually and combine them into useful further combinations. Herein: Fig. 1 to Fig. 3 a perspective view, a side view and a sectional view of a spray device, Fig. 4 a sectional view through the nozzle unit, Fig. 5 a perspective view of a nozzle element, Fig. 6 to Fig. 9 each a sectional view through the nozzle unit, Fig. 10 two perspective views of a part of the opening limiting unit, Fig. 11 a sectional view through a fluid receiving unit, Fig. 12 several views of a fluid transport element, Fig. 13 a perspective view of the fluid transport element from Fig. 11 with a sealing element, Fig. 14 two embodiments of a cover unit 81, Fig. 15 a sectional view through the spray device, Fig. 16 a perspective view of an exploded view of the spray device and Fig. 17 a perspective view of a part of the spray device.

[0099] In the following figures, identical components are provided with the same reference numerals.

[0100] Fig. 1 shows a spray device 11 for spraying a fluid, with a pressure generating unit 13 designed as a compressor unit ( Fig. 3 , Fig. 15 ) for generating a fluid flow and with an electronically commutated drive unit 15 for driving the pressure generating unit 13.

[0101] The spray device 11 has a nozzle unit 17 for dispensing a fluid ( Fig. 1 bis 3 ; Fig. 6 bis 9 ). The nozzle unit 17 is provided to spray a first fluid, such as a glaze or a varnish, with a first viscosity in a first spraying state and a second fluid different from the first fluid, such as a wall paint, with a second viscosity in a second spraying state.

[0102] The nozzle unit 17 has a nozzle parameter by means of which the spraying state can be set or changed. The spraying state changes depending on the nozzle parameter.

[0103] To spray a first fluid with a first (low) viscosity, a first spray state can be set by changing the nozzle parameter. To spray a second fluid with a second (higher) viscosity, a second spray state can be set by changing the nozzle parameter.

[0104] For spraying the fluid, the nozzle unit 17 has a nozzle element 19 with a fluid outlet opening 23 for dispensing the fluid.

[0105] The pressure generating unit 13 and the nozzle unit 17 are formed separately from one another and arranged on two different sides of the spray device 11. The pressure generating unit 13 and the nozzle unit 17 are fluidically connected in that the pressure generating unit 13 forms an air stream, which results in a force being applied to a fluid. For this purpose, an air stream enters the pressure generating unit 13 and exits through the nozzle element 19 of the nozzle unit 17.

[0106] The nozzle unit 17 has a fluid transport region 27 for fluid transport. The nozzle unit 17 has a needle element 31 for controlling or regulating fluid transport through the nozzle unit 17, in particular the fluid transport region 27. The nozzle unit 17 has a nozzle element 19 with a nozzle opening 27 for dispensing the fluid. The fluid transport region 27 is designed as a fluid flow region delimited by the nozzle element 19 and the needle element 31. The nozzle opening 27 has a circular cross-section. The fluid transport region 27 has an annular cross-section in a spraying state. The needle element 31 is provided to limit the nozzle opening 27 of the nozzle unit 17 and effects the fluid transport by means of a change in the nozzle opening 27. The nozzle opening 27 can be reduced or completely blocked by means of the needle element 31 inserted into the nozzle opening 27, so that less or no fluid is pumped.no fluid transport is possible. For this purpose, the needle element 31 is movably mounted in the nozzle unit 17. The needle element 31 is provided to adjust the size of the nozzle opening 27. The needle element 31 is movable along a movement axis BA (. Fig. 4 ) and movably mounted relative to the nozzle element 19. The needle element 31 is arranged in the nozzle element 19 in every state. In a blocked state, the needle element 31 extends completely through the nozzle opening 27 and, in particular, in such a way that the needle element 31 extends or is arranged from one side to a side of the nozzle element 19 facing away from the side.

[0107] The needle element 31 is by means of a spring element 35 ( Fig. 3 ) spring-loaded. The spring element 35 is arranged at an end of the needle element 31 facing away from the nozzle unit 17 and is prestressed in the direction of the nozzle unit 17, in particular prestressed such that the needle element 31 prevents or avoids an escape of the fluid in a blocked state.

[0108] The needle element 31 has a taper or needle tip at one end, which is adapted to the nozzle opening 27. The taper is designed such that the taper, in interaction with the nozzle unit 17, in particular the nozzle opening 27, is adapted to the fluid in the first spray state or the first viscosity and to the fluid in the second spray state or the second viscosity.

[0109] The fluid transport is greater in a first spray state than in a second spray state, which can be enabled by a movement / displacement of the needle element 31 in a direction opposite to the nozzle element 19 or the nozzle opening 27. As a result, the nozzle opening 27 is larger in a first spray state than in a second spray state.

[0110] As the distance of the needle element 31 from the nozzle element 19 or the nozzle opening 27 increases, the fluid transport area 27 between the needle element 31 and the nozzle element 19 is enlarged due to the geometry.

[0111] The nozzle unit 17 has four guide elements 39 designed as guide elevations for guiding the needle element 31. The fluid transport region 27 is delimited by the guide element 39. The guide element 39 is arranged at or adjacent to the nozzle opening 27 of the nozzle unit 17. The guide element 39 positions the needle element 31 centrally opposite the nozzle opening 27. The guide element 39 surrounds the needle element 31 in sections and extends axially and radially along the needle element 31. The guide element 39 is designed as a guide rib. The guide element 39 delimits the nozzle unit 17. The guide element 39 delimits the fluid transport region 27 or a flow volume. The guide element 39 is provided to align the needle element 31 such that a central axis of the needle element 31 coincides with a central axis of the nozzle unit 17 or the fluid outlet opening 23.

[0112] The guide element 39 delimits the fluid transport region 27 in the circumferential direction around the needle element 31 and directs a fluid flow. The guide element 39 projects in a direction along the central axis and / or transversely, in particular perpendicularly, to the central axis or movement axis BA. The guide element 39 is provided to delimit a fluid gap of the nozzle unit 17, which is delimited on the other hand by the needle element 31 and the nozzle element 19. The guide element 39 has a main extension that is transverse to the central axis.

[0113] The nozzle element 19 is conical, with the guide element 39 arranged in an inner region of the nozzle element 19. The guide element 39 is intended to position the nozzle element 19 relative to the needle element 31 axially along the central axis and radially to the central axis. The guide element 39 protrudes in a direction pointing toward the central axis. The guide element 39 forms a conical contact area for the needle element 31. The needle element 31 is arranged on the guide elements 39 and contacts them in every spraying state.

[0114] The spray device 11 has an opening limiting unit 41 for limiting a movement of the needle element 31. The opening limiting unit 41 is provided for setting a / the first spray state relative to a / the second spray state. The opening limiting unit 41 is coupled to the needle element 31. The opening limiting unit 41 limits a maximum movement of the needle element 31 and forms a bottom dead center of a movement of the needle element 31. The opening limiting unit 41 is provided for guiding the needle element 31 along the nozzle unit 17 along the guide element 39. The needle element 31 is guided by the guide element 39 in each spray state or is contacted by it. The opening limiting unit 41 is preloaded by a spring element 35. The opening limiting unit 41 is arranged on the machine housing 51 and extends through the machine housing 51.

[0115] The opening limiting unit 41 has a stop element 43 for limiting a movement of the needle element 31. The stop element 43 is adjustable and designed as a pitch element 43 / jump element. The pitch element 43 has a particularly substantially constant pitch and is curved. The pitch element 43 extends around an operating axis BDA. The pitch element 43 is rotatably mounted about an operating axis BDA. The pitch element 43 limits a movement of the operating element 47 by means of the set pitch. The stop element 43 is arranged on the machine housing 51 and is movably mounted relative to the machine housing 51.

[0116] The opening limiting unit 41 has a locking element 49, which is provided to provide a plurality of locking positions for the opening limiting unit 41. The locking element 49 is provided to hold a set locking position.

[0117] The opening limiting unit 41 has an operating element 47 for operating the opening limiting unit 41. The operating element 47 forms an operating function. The operating element 47 is provided for changing at least one parameter for conveying a fluid. The operating element 47 is provided for effecting a change in at least one parameter for conveying a fluid by changing a rotational speed of the drive unit 15 or by changing a pressure generation parameter of the drive unit 15. The operating element 47 is designed as an adjusting wheel. The operating element 47 is arranged on a machine housing 51 of the spray device 11 so as to be rotatable about an axis. The operating element 47 is formed integrally with the stop element 43. The operating element 47 is arranged on the machine housing 51.

[0118] The spray device 11 has an actuating element 53 for actuating the spray device 11, which is movably mounted on the machine housing 51 of the spray device 11 about an actuating axis BTA. The actuating element 53 has an actuating region 55 for actuating the spray device 11. The needle element 31 is arranged between the actuating region 55 and the actuating axis BTA.

[0119] The actuating element 53 is intended to be actuated during an actuation process to input at least one input variable. The actuating element 53 is intended to receive an input variable from an operator during an actuation process. The actuating element 53 is intended to be contacted directly by an operator. The actuating element 53 is designed as an electrical and / or mechanical actuating element 53. The actuating element 53 is intended to be moved when actuated by an operator. The actuating element 53 is intended to transition from a first functional state to a second functional state. The actuating element 53 is intended to activate and / or deactivate the drive unit 15. The actuating element 53 is intended to switch the drive unit 15 on and / or off.The actuating element 53 is provided for switching an on / off switch element on and / or off. The actuating element 53 is provided for changing a rotational speed of the drive unit 15 or for changing a pressure generation parameter of the drive unit 15.

[0120] The spray device 11 has a spring element 35 for returning the needle element 31 and / or the actuating element 53 from an actuated state. The spring element 35 is arranged on the needle element 31 and preloads the needle element 31.

[0121] The spray device 11 has a first air guide channel 95 and a second air guide channel 95, wherein the limiting element and / or the actuating element 53 is arranged between the two air guide channels. In particular, the air guide channels open into a single air guide channel 95.

[0122] The spray device 11 has a fluid receiving unit 61 designed as a fluid container for receiving and / or storing a fluid. The fluid receiving unit 61 is designed as a hollow volume and is intended to receive and dispense a fluid. The fluid receiving unit 61 has an open area. The fluid receiving unit 61 is designed to be detachably connectable to the machine housing 51 by means of a screw closure. In a connected state, the fluid receiving unit 61 is surrounded by the machine housing 51. In a connected state, the fluid receiving unit 61 has a fixed end and a free end facing away from the fixed end. The free end can form a storage section for storing / supporting the spray device 11.

[0123] The spray device 11 has a transport unit designed to transport fluid arranged in the fluid receiving unit 61 from the fluid receiving unit 61 to the nozzle unit 17 for spraying the fluid onto a workpiece to be machined. For this purpose, the transport unit has a fluid guide element.

[0124] The spray device 11 has a supply opening 69 for generating an air flow into the fluid receiving unit 61. The supply opening 69 is completely surrounded by the machine housing 51 in a connected state and arranged on the machine housing 51. The air supply opening 69 is arranged in the fluid receiving unit 61 in a connected state. The spray device 11 has a sealing element 71 for preventing backflow of the fluid. The sealing element 71, 91 is provided to cover the supply opening 69. The sealing element 71 forms part of a check valve, which is provided to prevent backflow of paint into the air guide channel 95. The sealing element 71 can be elastic. The sealing element 71 is arranged on the fluid receiving unit 61 of a receiving opening 73 of the fluid receiving unit 61.In a connected state, the sealing element 71 extends along the receiving opening 73 and completely covers it. The sealing element 71 is provided to seal the fluid receiving unit 61. In a connected state, the sealing element 71 is arranged between the machine housing 51 and the fluid receiving unit 61. In a connected state, the sealing element 71 is surrounded by the machine housing 51 in a plane of 360°. The sealing element 71 is designed as an annular sealing plate.

[0125] The sealing element 71 is designed such that the sealing element 71 is elastically deflected when air flows in through the supply opening 69.

[0126] The spray device 11 has a tubular fluid transport element 75 for transporting the fluid from the fluid receiving unit 61. The fluid transport element 75 is provided for creating a fluidic connection from the fluid receiving unit 61 to the machine housing 51. The fluid transport element 75 is designed as a dip tube element and, in a connected state, is completely accommodated in the fluid receiving unit 61. The fluid transport element 75 is connectable to the machine housing 51. The fluid transport element 75 surrounds the machine housing 51 in a plane by 360°. The fluid transport element 75 is arranged in a plane between an outer part of the machine housing 51 and an inner part of the machine housing 51. In a connected state, the fluid transport element 75 is completely surrounded by the machine housing 51 and the fluid receiving unit 61 in a plane by 360°.

[0127] The fluid transport element 75 has a retaining groove 77 for holding the sealing element 71. The retaining groove 77 receives and holds the sealing element 71 at a central recess of the sealing element. The retaining groove 77 extends circumferentially around the fluid transport element 75.

[0128] The supply opening 69 is arranged laterally on the fluid transport element 75 and extends through the entire material thickness of the fluid transport element 75. The supply opening 69 is arranged at or in the air inlet area. The supply opening 69 is arranged at a retaining groove 77 of the fluid transport element 75. The retaining groove 77 is completely surrounded by the sealing element 71.

[0129] The fluid transport element 75 is arranged between the machine housing 51 and the fluid receiving unit 61. The fluid transport element 75 has an air inlet region 78, a fluid inlet region 79a, and a fluid outlet region 79b. The air inlet region 78 completely surrounds the fluid outlet region 79b. The air inlet region 78 is pot-shaped. In a connected state, the air inlet region 78 is delimited in the radial direction by the fluid transport element 75 and by the machine housing 51. In a connected state, the fluid outlet region 79b is arranged between the air inlet region 78 and a fluid inlet region 79a.

[0130] The spray device 11 has a machine housing 51 and a cover unit 81 covering the machine housing 51.

[0131] The pressure generating unit 13 has an air inlet opening 14a and an air outlet opening 14b. The pressure generating unit 13 takes in air through the air inlet opening 14a and discharges it through the air outlet opening 14b. The pressure generating unit 13 is designed to compress air.

[0132] The air at the air outlet opening 14b has a higher air pressure and / or a higher flow velocity than the air at the air inlet opening 14a.

[0133] The cover unit 81 has a cover element 83, which covers the air inlet opening 14a of the pressure generation unit 13. The cover element 83 is arranged at a distance from the pressure generation unit 13. The cover element 83 can cover a projected area of ​​the air inlet opening 14a. The projected area can be formed as a parallel surface of the air inlet opening 14a, which is arranged substantially perpendicular to the surface of the air inlet opening. A surface of the air inlet opening 14a projected at the level of the cover element 83 can be covered by the cover element 83.

[0134] The cover element 83 is formed entirely from an air-impermeable material. The cover element 83 is formed from a plastic material. The cover element 83 is spaced apart from the pressure generation unit 13 and the air inlet opening 14a. The cover element 83 has an extension that is greater than an extension of the air inlet opening 14a parallel to a surface of the air inlet opening 14a. The cover element 83 completely spans the air inlet opening 14a. The cover element 83 is bent in at least one plane and is essentially dome-shaped. The cover element 83 has a hollow cylindrical section. The cover element 83 has a spherical shell-shaped section. The spherical shell-shaped section can adjoin the hollow cylindrical section.

[0135] The cover unit 81 has a filter element 85 for filtering the incoming air flow. The filter element 85 surrounds the cover element 83 in a plane by 360°. The filter element 85 has a honeycomb structure and delimits the cover element 83. The filter element 85 is intended to reduce the penetration of dust and dirt into the spray device 11 or the machine housing 51.

[0136] The cover element 83 protrudes from the filter element 85 and can delimit the filter element 85. The cover element 83 is partially cylindrical. The cover element 83 can partially be circular spherical segment-shaped. The cover element 83 can delimit a hollow volume. The hollow volume can be formed opposite the air inlet opening 14a.

[0137] The pressure generating unit 13 has an air outlet opening 14b, which is arranged on a side of the pressure generating unit 13 facing away from the air inlet opening 14a. The air outlet opening is smaller than the air inlet opening 14a.

[0138] The spray device 11 has an air duct 95 in which the pressure generating unit 13 is arranged. The pressure generating unit 13 is completely surrounded by the air duct 95 in a plane by 360° and protrudes axially from the air duct 95.

[0139] The air guide channel 95 is designed as a bearing element for supporting the pressure generating unit 13.

[0140] The spray device 11 has an air guide channel 95 and a sealing element 91. The sealing element 91 is provided to seal the air guide channel 95 from the pressure generating unit 13 arranged in the air guide channel 95. The sealing element 91 is arranged in the air guide channel 95 and surrounded by it.

[0141] The spray device 11 has a bearing opening 97, which supports the pressure generation unit 13 in the radial direction. The bearing opening 97 accommodates the pressure generation unit 13. The bearing opening 97 completely surrounds the pressure generation unit 13 in a plane by 360°. The bearing opening 97 separates an air inlet flow at the air inlet opening 14a from an air outlet flow at the air outlet opening by means of the pressure generation unit 13.

[0142] The bearing opening 97 is delimited by a bearing rib, which is arranged between an air inlet opening 14a and an air outlet opening 14b of the pressure generating unit 13. The air inlet opening is arranged on a side facing away from the air outlet opening 14b. The pressure generating unit 13 extends through the bearing opening 97. The pressure generating unit 13 partially protrudes from the air duct 95. The pressure generating unit 13 has a radial elevation 99, which supports the pressure generating unit 13 at the bearing opening 97 in the axial direction.

[0143] The sealing element 91 is arranged in the axial direction between the radial elevation 99 and the bearing opening 97. The sealing element 71, 91 is arranged between the pressure generation unit 13 and an air duct wall. The sealing element 91 is designed as an O-ring.

[0144] As in Fig. 16 As shown, the spray device 11 has a holding element 101 for positively holding the nozzle unit 17 as viewed along the output axis Aa. The holding element 101 has a spring element 103 formed integrally with the holding element 101 for adjusting the nozzle unit 17 or a nozzle parameter of the nozzle unit 17. Accordingly, the holding element 101 and the spring element 103 are formed from one part, in particular from a cast. The spring element 103 and the holding element 101 are formed from a plastic material. The spring element 103 extends as viewed perpendicular to the output axis Aa. The spring element 103 is designed for adjusting the nozzle unit 17 or the nozzle parameter of the nozzle unit 17. In an operating state, the holding element 101 is mounted so as to be movable, in particular rotatable, relative to the nozzle unit 17.The holding element 101 receives the nozzle unit 17, in particular completely, and surrounds it in the circumferential direction around the dispensing axis Aa.

[0145] The holding element 101 is essentially annular and has a recess 105 arranged centrally as viewed around the dispensing axis Aa. The recess 105 extends through the entire holding element 101 and is formed as an opening. In an operating state, the nozzle unit 17 can be arranged in the holding element 101 and can be pushed through the holding element 101.

[0146] The holding element 101 has a stop element 107 for positioning an arrangement of the holding element 101 relative to the machine housing 51. The stop element 107 is designed as a stop elevation extending along the output axis Aa. The stop element 107 is provided to limit a rotational movement of the holding element 101 about the output axis Aa. For this purpose, the stop element 107 has a stop surface 109 which extends substantially perpendicularly and along the output axis Aa. The stop surface 109 is arranged at a screw-in end of the machine housing 51. The stop surface 109 is designed substantially perpendicular to a rotational movement of the holding element 101.

[0147] The holding element 101 has a threaded element 111 designed as an internal thread for connecting the holding element 101 to the machine housing 51, which is delimited by the spring element 103 when viewed along the output axis Aa. It is understood that the machine housing 51 has a further threaded element 113 designed as an external thread for establishing a screw connection. The further threaded element 113 is formed on a hollow cylindrical extension of the machine housing 51 and surrounds it around the output axis Aa. A screwing movement of the holding element 101 is limited by the stop element 107 at the screw-in end of the machine housing 51.

[0148] The spring element 103 is designed as a material spring and made of a plastic material. The spring element 103 is operatively indirectly connected to the machine housing 51. The spring element 103 applies a spring force along the discharge axis Aa to the nozzle unit 17. The spring element 103 is provided to apply a spring force to the nozzle unit 17 in order to hold the nozzle unit 17 to the machine housing 51. The spring element 103 is designed as a bending spring element 103 or as a leaf spring element 103.

[0149] The spring element 103 is formed integrally with the holding element 101. The spring element 103 has a fixed end 121 and a loose end 123 facing away from the fixed end 121. The fixed end 121 is arranged on an inner side of the holding element 101, viewed perpendicular to the output axis Aa. The loose end 123 is arranged closer to the output axis Aa than the fixed end 121. The spring element 103 is designed as a clamping wing and limits an extension of the holding element 101 perpendicular to the output axis Aa. The spring element 103 is essentially circular segment-shaped. The spring element 103 limits the recess 105 of the holding element 101.

[0150] At a loose end 123, the spring element 103 has a projection 125. The projection 125 is intended to form a particularly defined contact line with the nozzle unit 17.

[0151] The nozzle unit 17 is clamped between the holding element 101 and the machine housing 51 by means of the holding element 101. The nozzle unit 17 has a nozzle element 19 for dispensing a fluid. The nozzle unit 17 has an air cap element 127, which is rotatably mounted relative to the nozzle element 19 and for dispensing an air stream, which can be rotatably locked relative to the nozzle element 19 in an operating state. The nozzle element 19 has a locking element 131 for a lockable arrangement of the air cap element 127. The nozzle element 19 can be lockably arranged relative to the air cap element 127 in a first, second, and / or third operating state. The nozzle element 19 has a locking geometry 130 with a plurality of locking elements 131, which define locking positions. The locking elements 131 are designed as uneven surfaces which counteract a rotational movement of the holding element 101.The locking elements 131 are designed as locking recesses. In this case, three locking positions in three operating states are provided.

[0152] In an operating state, the nozzle element 19 is provided to receive the air cap element 127. The nozzle element 19 surrounds the air cap element 127 in a plane by 360°. In an operating state, the nozzle element 19 extends through a central region of the air cap element 127.

[0153] The air cap element 127 has two support elements 135 for supporting the air cap element 127 relative to the nozzle element 19. The support elements 135 are arranged on opposite sides of the air cap element 127. The support elements 135 extend laterally and perpendicularly to the discharge axis Aa. The support elements 135 limit an extension of the air cap element 127 perpendicular to the discharge axis Aa. The support elements 135 serve as a support for the air cap element 127. In particular, the support elements 135 are arranged on a circumferential surface 137 of the air cap element 127 and protrude relative thereto.

[0154] The support element 135 is designed as a locking element 131 and is configured to contact the locking geometry 130 of the nozzle element 19. The support element 135 of the air cap element 127 is configured to couple to the locking geometry 130. The locking geometry 130 is configured to receive the support element 135. The support element 135 can be locked relative to the locking geometry 130 or the locking recesses in a first locking position and in two further locking positions. The support element 135 can be movably mounted relative to a collar region 139 of the nozzle element 19.

[0155] The air cap element 127 has a deflection element 141, which is intended to deflect an air flow. The deflection element 141 is intended to align an air flow in a direction transverse to the output axis Aa. The deflection element 141 has a deflection outlet opening 143, which is essentially drop-shaped in cross-section. The deflection outlet opening 143 is tapered or narrowed in cross-section when viewed in the direction of the output axis Aa. The deflection outlet opening 143 has a first end facing the output axis Aa and a second end facing away from the output axis Aa. The deflection outlet opening 143 has a radius 145 at the first end, which is smaller than a radius 147 at the second end.

[0156] The deflection element 141 has an air flow channel 149 ( Fig. 4) which extends substantially along the output axis Aa through the entire air cap element 127. The air flow channel 149 has a substantially rectilinear section 149a which extends along the output axis Aa. The air flow channel 149 can have a further substantially rectilinear section 149b which extends transversely to the output axis Aa. The deflection outlet opening 143 has an opening area 151 which is delimited by the deflection outlet opening 143 and is arranged at a flow end of the air flow channel 149. The opening area 151 is oriented transversely to the output axis Aa.

[0157] The deflection element 141 extends along the output axis Aa and has two deflection elevations 153. The deflection elevations 153 limit the extent of the air cap element 127 along the output axis Aa. The deflection elevations 153 protrude along the output axis Aa and are arranged off-center or spaced from the output axis Aa. The deflection elevations 153 have a side surface 155 that can be actuated by an operator. The side surface 155 extends essentially along an axial plane. The deflection elevation 153 is provided to rotate the air cap element 127 about the output axis Aa.

[0158] The air cap element 127 has a centrally arranged flow recess 159, which in an operating state is provided for receiving the nozzle element 19.

[0159] The deflection element 141 is intended to engage through the holding element 101 in an operating state.

[0160] The nozzle element 19 has a locking element 131 for a lockable arrangement of the air cap element 127. In an operating state, the nozzle element 19 is provided to receive the air cap element 127 and to surround it in the circumferential direction around the dispensing axis Aa. The nozzle element 19 is rotatably connectable to the machine housing 51. For this purpose, the machine housing 51 has a receiving recess 161, which is provided for receiving and rotatably supporting the nozzle element 19. The nozzle element 19 has a nozzle elevation (not shown) corresponding to the receiving recess 161. The receiving recess 161 is arranged on an inner side of the extension of the machine housing 51 and is provided to receive a receiving elevation of the nozzle element 19 along the dispensing axis. The receiving recess 105 delimits the machine housing 51 along the output axis Aa and perpendicular to the output axis Aa.

[0161] The retaining element 101 is connectable to the air cap element 127 such that the retaining element 101 adjustably rotates the air cap element 127 from one operating state to another operating state. A rotational movement of the air cap element 127 is limited in the circumferential direction about the output axis Aa. A rotational movement of the air cap element 127 is limited in the circumferential direction by the spring element 103.

[0162] The spring element 103 has a limiting element 165 in the circumferential direction, which is intended to limit a rotational movement of the deflecting element 141. The spring element 103 provides an adjustment range or a rotation range of the air cap element 127 and is limited in the circumferential direction about the output axis Aa by the limiting element 165. The rotation range can enable a rotation angle of approximately 90°. The limiting element 165 limits an extension of the spring element 103 in the circumferential direction about the output axis Aa. The spring element 103 has a further limiting element 167, which is arranged on a side of the spring element 103 facing away from the limiting element 165. The further limiting element 167 is designed analogously to the limiting element 165.

Claims

1. Spray device, in particular for spraying a fluid, with a pressure generating unit (13) for generating a fluid flow, with a, in particular electronically commutated, drive unit (15) for driving the pressure generating unit (13), with a machine housing (51), with a nozzle unit (17), in particular having a nozzle opening (27), for dispensing a fluid along an dispensing axis (Aa), with a holding element (101) for holding the nozzle unit (17), in particular in a form-fitting manner, characterized by a spring element (103), in particular formed integrally with the holding element (101), for adjusting the nozzle unit (17), in particular a nozzle parameter of the nozzle unit (17), wherein the spring element (103) extends perpendicular to the output axis (Aa) when viewed.

2. Spray device according to claim 1, characterized in thatthe spring element (103) is designed as a clamping wing, wherein the spring element (103) limits an extension of the holding element (101) perpendicular to the output axis (Aa).

3. Spray device according to one of the preceding claims, characterized in that the holding element (101) has a stop element (107) for positioning an arrangement of the holding element (101) relative to the machine housing (51) and a threaded element for connecting the holding element (101) to the machine housing (51).

4. Spray device according to one of the preceding claims, characterized in that the nozzle unit (17) has a nozzle element (19) for dispensing a fluid and an air cap element (127) rotatably mounted relative to the nozzle element (19) for dispensing an air stream, wherein the air cap element (127) can be rotatably locked relative to the nozzle element (19) in an operating state.

5. Spray device according to one of the preceding claims, characterized in that Air cap element (127) the air cap element (127) has a support element (135) for supporting the air cap element (127) relative to the nozzle element (19).

6. Spray device according to one of the preceding claims, characterized in that the air cap element (127) has a deflection element (141) for deflecting an air flow, wherein the deflection element (141) has a deflection outlet opening (143) which is substantially drop-shaped in section.

7. Spray device according to one of the preceding claims, characterized in that Nozzle element (19) discharge axis (Aa) the nozzle element (19) is provided in an operating state to receive the air cap element (127) and to surround the discharge axis Aa.

8. Spray device according to one of the preceding claims, characterized in that the nozzle element (19) can be connected to the machine housing (51) in a rotationally fixed manner.

9. Spray device according to one of the preceding claims, characterized in that the holding element (101) is connectable to the air cap element (127), in particular is connectable in such a way that the holding element (101) adjusts, in particular rotates, the air cap element (127), in particular in an adjustable manner, from one operating state to another operating state.

10. Spray device according to one of the preceding claims, characterized in that the spring element (103) has a limiting element 165 arranged in the circumferential direction around the output axis (Aa), which is intended to limit a rotational movement of the deflecting element (141).

Images