Injection device

Abstract

The invention relates to an injection device, in particular for injecting a fluid, comprising: a pressure generating unit (13) for generating a fluid flow; a drive unit (15), in particular electronically commutated, for driving the pressure generating unit (13); a machine housing (51); a nozzle unit (17) for outputting a fluid along an output axis (Aa), in particular having a nozzle opening (27); the invention relates to a holding element (101) for holding a nozzle unit (17), in particular in a form-fitting manner. According to the invention, the injection device has a spring element (103) for adjusting the nozzle unit (17), in particular a nozzle parameter of the nozzle unit (17), which spring element is designed in particular in one piece with the holding element (101), the spring element (103) extending perpendicularly to the output axis (Aa).

Description

Field of the Invention

[0001] The present invention relates to an injection device. Background Art

[0002] Similarly supported injection devices are known in the prior art. Summary of the Invention

[0003] The object of the present invention is to improve the injection device by simple structural measures.

[0004] This object is achieved by an injection device, in particular an injection device for injecting a fluid, which injection device has: a pressure generating unit for generating a fluid flow; a drive unit for driving the pressure generating unit, in particular an electronically commutated drive unit.

[0005] The injection device particularly has a nozzle unit for outputting the fluid along an output axis.

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

[0007] Normally, different replaceable nozzle units are used to inject a first fluid having a first viscosity and a second fluid having a second viscosity. Here, the different nozzle units are matched to the fluid to be injected, whereby one nozzle unit is designed, for example, for a fluid with a dispersion paint and another nozzle unit is designed, for example, for a paint fluid. When a fluid is used with a nozzle unit that is not designed for or not adapted to this fluid, the fluid may also be injected. However, the requirements of the desired injection pattern cannot be met thereby.

[0008] With the current injection device, two fluids can be injected by means of a single nozzle unit.

[0009] It should be understood that the injection of the fluid should meet the usual requirements known and required in the current field of injection devices. Therefore, "injection" should be understood not only as any possibility of injection, but also as an injection that meets the usual requirements in the field of injection by means of such an injection device.

[0010] The nozzle unit can have nozzle parameters. The nozzle parameters can be adjusted or changed to adjust the injection state. Thereby, the nozzle unit can be optimally adjusted for injecting the fluid, in particular such that different fluids can be injected by means of a single nozzle unit.

[0011] The injection state can be changed according to the nozzle parameters. For example, the nozzle parameters can be adjusted to achieve a first injection state. In this example, only a fluid with low viscosity can be injected. For example, the nozzle parameters can be adjusted to achieve a second injection state. At this time, only a fluid with high viscosity can be injected, for example.

[0012] The pressure generating unit can be configured as a blower unit, a compressor unit, or a pump unit, or other pressure generating units meaningful to those skilled in the art for generating pressure. The generated pressure is set to apply a force or pressure to the fluid. The fluid to be injected can be conveyed by means of the pressure generating unit.

[0013] The drive unit can be set to drive the injection device, especially the pressure generating unit. The drive unit can be set to, by means of drive energy, excite the pressure generating unit to generate the amount of air required for injecting the fluid onto the workpiece to be processed. The drive unit can be set to, by means of the pressure generating unit, provide the air flow required for injecting the fluid onto the workpiece to be processed. The drive unit can have an electric motor, especially an electronically commutated motor, for generating drive energy.

[0014] The nozzle unit can be set to inject the fluid onto the workpiece to be processed. The nozzle unit can have a nozzle element. The nozzle unit can have a fluid outlet opening for outputting the fluid.

[0015] The pressure generating unit and the nozzle unit can be constructed separately from each other. The pressure generating unit can be arranged on a side of the injection device facing away from the nozzle unit. The pressure generating unit and the nozzle unit can be fluidly connected to each other. The pressure generating unit can form an air flow, which is set to apply a force to the fluid to inject the fluid. The pressure generating unit can generate an air flow that connects the air inlet of the injection device to the air outlet of the injection device.

[0016] The first fluid can be composed of paint, especially wall paint. The first fluid can be composed of commercially available wall paint, especially wall paint for the residential field. The first fluid can be configured as a coating. The first fluid can be water-based. The first fluid can be formed as a dispersion paint. The first fluid can be viscous or thin.

[0017] The second fluid can be formed from varnish (Lack) or glaze (Lasur). The second fluid can be liquid. The second fluid can contain binders (such as resins, dispersions or emulsions), fillers, pigments, solvents and additives (such as fungicides).

[0018] The first fluid and the second fluid can have a viscosity between 0.02 and 3 Pa·s. The first fluid should be in the region of the upper limit, while the second fluid should be in the region of the lower limit.

[0019] As a spraying process, a low-pressure spraying process is usually adopted, which involves the following processes: wherein the spraying material is sprayed at a low pressure within about 0.7 bar and a high air volume of about 50 liters per minute. This HVLP spraying process achieves a coating degree of up to about 65% due to low overspray, that is, due to its low spray loss, and is thus superior to the traditional process with a coating degree between about 20% and about 35%. The process is characterized by an air cone surrounding the spraying material, which reduces overspray and paint mist formation. Therefore, advantages such as paint savings and low solvent emissions are generated, which particularly act in an environmentally friendly manner.

[0020] The spraying device can have a transport unit, which is arranged to transport the fluid arranged in the fluid container from the fluid container to the nozzle unit for spraying the fluid onto the workpiece to be processed. For this purpose, the transport unit can have a guiding element.

[0021] Practically, it can be that the nozzle unit has a fluid transport area for fluid transport. Practically, it can be that the nozzle unit has a needle element for controlling or regulating the fluid transport passing through the nozzle unit, especially the fluid transport area. The nozzle unit can have a nozzle element for outputting the fluid. The nozzle element can have a nozzle opening. The fluid transport area can be configured as a (fluid) flow area. The fluid transport area can be delimited by the nozzle element and the needle element. The nozzle opening can have a circular cross-section. The nozzle opening can have a non-circular cross-section. The nozzle opening can have an annular cross-section. The fluid transport area can have a circular cross-section in the spraying state. The fluid transport area can have an annular cross-section in the spraying state. The needle element can be arranged to delimit the nozzle opening of the nozzle unit. The needle element can achieve fluid transport by changing the nozzle opening. For example, the nozzle opening can be reduced or completely closed by means of the needle element, thereby achieving less or no fluid transport. The needle element can be movably supported in the nozzle unit. The needle element can be arranged to adjust the size of the nozzle opening. The needle element can be movably supported along the movement axis. The needle element can be movably supported relative to the nozzle element. The needle element can be arranged in the nozzle unit, especially the nozzle element, in a state, especially any state (locking state). In one state, especially in the locking state, the needle element can especially penetrate through the nozzle unit, especially the nozzle opening, such that the needle element extends from one side of the nozzle element to the side opposite to this side.

[0022] The needle element can be elastically supported by a spring element. The spring element can be arranged at the end of the needle element facing away from the nozzle unit. The needle element can especially be prestressed in the direction of the nozzle unit, such that the needle element prevents or avoids fluid discharge in the locking state.

[0023] The needle element (especially at the end) can have a constriction or a needle tip. The constriction can be matched to the nozzle opening. The constriction can be configured such that the constriction and the nozzle unit, especially the nozzle opening, cooperate to match the fluid in the first ejection state or the first viscosity and the fluid in the second ejection state or the second viscosity.

[0024] Fluid transport can be greater in the first ejection state than in the second ejection state. This can be achieved, for example, by moving / shifting the needle element in a direction opposite to the nozzle element or the nozzle opening. Thereby, a larger flow-through area can be provided. The nozzle opening can be larger, especially in the first ejection state than in the second ejection 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 (especially depending on the geometry) increases. Thereby, more fluid can be provided for ejection.

[0026] Practically, it can be that the nozzle unit has a guiding element for guiding the needle element, which guiding element is especially configured as a guiding protrusion. The fluid transport area can be delimited by the guiding element. The guiding element can be arranged on the nozzle opening of the nozzle unit or adjacent to the nozzle opening of the nozzle unit. The guiding element can position the needle element relative to the nozzle opening (especially centrally). The guiding element can surround the needle element sectionally. The guiding element can extend along the needle element, especially axially. The guiding element can extend radially to the needle element. The guiding element can be configured as a guiding rib. The guiding element can delimit the nozzle unit. The guiding element can delimit the fluid transport area, especially the flow volume. It should be understood that one or more guiding elements can be provided. The guiding element can be provided for orienting the needle element such that the central axis of the needle element coincides with the central axis of the nozzle unit or the fluid outlet opening. The central axis can coincide with the output axis (along which the fluid is output). The central axis and the output axis can be coaxially arranged, especially in the operating state.

[0027] The guiding element can delimit the fluid transport area in the circumferential direction around the needle element. The guiding element can guide the fluid flow. The guiding element can protrude in the direction of the central axis and / or transversely to, especially perpendicular to, the central axis.

[0028] The guiding element can be provided for delimiting the fluid gap of the nozzle unit. The fluid gap can be delimited by the needle element and the nozzle element. The guiding element can have a main extension transverse to the central axis.

[0029] It is proposed that the nozzle element is configured in a conical shape, wherein the guiding element is arranged on the inner region of the nozzle element. The guiding element can be arranged to axially position the nozzle element relative to the needle element along the central axis and / or radially relative to the central axis. The guiding element can protrude in the direction pointing towards the central axis.

[0030] The guiding element can form a conical stop region for the needle element.

[0031] The needle element can be arranged on the guiding element in a spraying state, especially in any spraying state, and in particular in contact with the guiding element.

[0032] Practically, it can be that the injection device has an opening limiting unit for limiting the movement of the needle element, especially the needle element. The opening limiting unit can be arranged to adjust the first injection state relative to the second injection state. The opening limiting unit can be connected to the needle element, especially coupled. The opening limiting unit can limit the maximum movement of the needle element. The opening limiting unit can form the bottom dead center of the movement of the needle element. The opening limiting unit can be arranged to guide the needle element along the nozzle unit, especially along the guiding element. The needle element can be guided by the guiding element or contacted by the guiding element in any injection state. The opening limiting unit can be prestressed, especially by means of a spring element. The opening limiting unit can be arranged on the machine housing and especially extend through the machine housing.

[0033] The opening limiting unit can have a stop element for limiting the movement of the needle element, especially the needle element. The stop element can be configured to be adjustable. The stop element can be configured as an inclined element / a jump element. The inclined element can have an especially substantially constant slope. The inclined element can be configured to be curved. The inclined element can extend around an axis, especially the operating axis. The inclined element can be rotatably supported around the axis. The inclined element can limit the movement of the operating element, especially by means of the adjusted slope. The stop element can be arranged on the machine housing and especially movably supported.

[0034] The opening limiting unit can have a locking element. The locking element can be arranged to provide a locking position for the opening limiting unit. The locking element can be arranged to maintain the adjusted locking position.

[0035] The opening limit unit can have a manipulation element for manipulating the opening limit unit. The manipulation element can form a manipulation function. A second manipulation element can be provided for the change, in particular the alteration, of at least one characteristic parameter that is used for fluid conveyance. The manipulation element can be provided for causing a change in at least one characteristic parameter for fluid conveyance by means of a change in the rotational speed of the drive unit or by generating a change in the pressure of the drive unit to produce a change in the characteristic parameter. The manipulation element can be configured as an adjusting wheel. The manipulation element can in particular be arranged rotatably about an axis on the machine housing of the injection device. The manipulation element can be integrally constructed with a stop element. The manipulation element can be arranged on the machine housing. Thereby, an opening matched to the respective fluid to be used can be limited, and thereby an optimized injection pattern can be achieved.

[0036] Practically, it can be that the injection device has an operating element for operating the injection device.

[0037] Practically, it can be that the operating element is supported on the machine housing of the injection device in a manner that is movable in particular about an operating axis. The operating element can have an operating area for operating the injection device. The needle element can be arranged between the operating area and the operating axis.

[0038] The operating element can be provided for being operated during operation to input at least one input parameter. The operating element can be provided for receiving the input parameter of the operator during operation. The operating element can be provided for being contacted by the operator, in particular indirectly or directly. The operating element can be configured as an electrical and / or mechanical operating element. The operating element can be provided for moving when operated by the operator. The operating element can be provided for transitioning from a first functional state to a second functional state. The operating element can be provided for activating and / or deactivating the drive unit. The operating element can be provided for switching on and / or off the drive unit. The operating element can be provided for switching on / off the switching on and / or off of an element. The operating element can be provided for generating a change in a characteristic parameter by means of a change in the rotational speed of the drive unit or by generating a change in the pressure of the drive unit.

[0039] Practically, it can be that the injection device has a spring element for returning the needle element and / or the operating element from the operating state. The spring element can be arranged on the needle element. The spring element can prestress the needle element.

[0040] Practically, it can be that the injection device has a first air guiding channel and a second air guiding channel, wherein the limiting element and / or the operating element is arranged between the two air guiding channels. The air guiding channels in particular lead into a single air guiding channel.

[0041] The injection device may have an operating unit for operating the injection device. Practically, it may be that the injection device has an electronic unit for controlling or adjusting the rotational speed of the drive unit. The electronic unit may be arranged to adjust the rotational speed of the drive unit according to the operation of the operating unit.

[0042] Furthermore, practically, it may be that the injection device has a fluid receiving unit for receiving and / or storing fluid, in particular a fluid container. The fluid receiving unit may be configured as a hollow volume. The fluid receiving unit may receive fluid. The fluid receiving unit may output fluid. The fluid receiving unit may have an open area. The fluid receiving unit may be connected to the machine housing. The fluid receiving unit may have a screw closure element for connecting the fluid receiving unit to the machine housing. In the connected state, the fluid receiving unit may be surrounded by the machine housing. In the connected state, the fluid receiving unit may have a fixed end and a free end facing away from the fixed end. The fluid receiving unit, in particular the free end, may form a parking section for parking / supporting the injection device.

[0043] Also, practically, it may be that the injection device has an input opening for generating an air flow into the fluid receiving unit. In the connected state, the input opening may be surrounded by the machine housing, in particular completely surrounded. The input opening may be arranged on the machine housing. The air input opening may be arranged in the fluid receiving unit in the connected state.

[0044] Practically, it may be that the injection device has a sealing element for preventing the backflow of fluid. The sealing element may be arranged to cover the input opening. The sealing element may form part of a check valve arranged to prevent air or paint from flowing back into the air guiding channel. The sealing element may be configured to be elastic. The sealing element may be formed of foam plastic, in particular closed-cell foam plastic.

[0045] Also, practically, it may be that the sealing element is arranged on the fluid receiving unit, in particular on the receiving opening of the fluid receiving unit. In the connected state, the sealing element may extend along and / or cover the receiving opening, in particular completely cover it. The sealing element may be arranged to seal the fluid receiving unit. The sealing element may be arranged between the machine housing and the fluid receiving unit in the connected state. The sealing element may be surrounded by the machine housing in the connected state, in particular surrounded 360° in a plane by the machine housing. The sealing element may be configured as a sealing plate. The sealing element may be configured in an annular shape.

[0046] Also, practically, it may be that the sealing element is configured such that it is elastically deflected when air flows in through the input opening.

[0047] It can also be practically that the injection device has a fluid transport element for transporting fluid from the fluid receiving unit, in particular a tubular fluid transport element. The fluid transport element can be arranged to establish a fluid-technical connection from the fluid receiving unit to the machine housing. The fluid transport element can be configured as a suction tube element. The fluid transport element can be received, especially completely, in the fluid receiving unit in the connected state. The fluid transport element can be connected to the machine housing. The fluid transport element can surround the machine housing, especially in a plane by 360°. The fluid transport element can be arranged in a plane between the outer part and the inner part of the machine housing. In the connected state, the fluid transport element can be surrounded, especially completely surrounded, especially in a plane by 360°, by the machine housing and / or the fluid receiving unit.

[0048] It can be practically that the fluid transport element has a holding groove for holding a sealing element. The holding groove can receive and hold the sealing element at the central recess of the sealing element. The holding groove can extend in the circumferential direction around the fluid transport element.

[0049] The input opening can be arranged laterally on the fluid transport element in particular. The input opening can extend, in particular, through the entire material thickness of the fluid transport element. The input opening can be arranged on or within the air inlet area. The input opening can be arranged on the holding groove of the fluid transport element. The holding groove can be surrounded, especially completely surrounded, by the sealing element.

[0050] It can also be practically that the fluid transport element is arranged between the machine housing and the fluid receiving unit. It can also be practically that the fluid transport element has an air inlet area and a fluid outlet area. The air inlet area can surround the fluid outlet area, especially completely surround the fluid outlet area. The air inlet area can be configured as a can-shaped. Especially in the connected state, especially in the radial direction, the air inlet area can be bounded on the one hand by the conveying element and on the other hand by the machine housing. Especially in the connected state, the fluid outlet area can be arranged between the air inlet area and the fluid inlet area.

[0051] The injection device can have a machine housing and a cover unit for covering the machine housing.

[0052] It can be practically that the injection device has a machine housing and a cover unit for covering the machine housing, wherein the cover unit, especially the cover element of the cover unit, covers / shields the air inlet of the pressure generating unit, especially the pressure generating unit.

[0053] The pressure generating unit may have an air inlet and an air outlet. The pressure generating unit may receive air through the air inlet and release air through the air outlet. The pressure generating unit may be arranged to compress air. The air at the air outlet may have a higher air pressure and / or a higher flow rate relative to the air at the air inlet.

[0054] The cover unit may be arranged at a certain distance relative to the pressure generating unit. The cover unit may cover the projection plane of the air inlet. The projection plane may be formed as a plane parallel to the air inlet, and the plane is arranged to be substantially perpendicular to the plane of the air inlet. The plane of the projection of the air inlet onto the height of the cover element may be covered by the cover element.

[0055] The cover unit, especially the cover element, may especially be formed entirely of an airtight material. The cover unit may be formed of a plastic material.

[0056] The cover unit may be arranged to reduce noise emissions in such a way that the sound generated by the pressure generating unit or leaking from the air inlet is reduced by the cover unit, especially by being reflected multiple times. Here, the sound is deflected and redirected multiple times by the cover unit. Thereby, on the one hand, an air flow to the pressure generating unit can be provided, and on the other hand, noise emissions can be reduced.

[0057] Practically, it may be that the cover element is configured at a certain distance from the pressure generating unit, especially from the air inlet.

[0058] Practically, it may be that the cover element has an extension larger than that of the air inlet, especially an extension parallel to the plane of the air inlet. The cover element may span the air inlet, especially completely span it.

[0059] Practically, it may be that the cover element is configured to be curved, especially dome-shaped, in at least one plane. The cover element may have a hollow cylindrical section. The cover element may have a spherical shell-shaped, especially hollow spherical, section. The spherical shell-shaped section may be connected to the hollow cylindrical section.

[0060] Practically, it may be that the cover unit has a filter element for filtering the incoming air flow, wherein the filter element surrounds the cover element, especially 360° in a plane. The filter element may delimit the cover element. The filter element may have a honeycomb structure. The filter element may be arranged to reduce the entry of dust and dirt into the injection device or the machine housing. Thereby, damage to the pressure generating unit can be prevented. The filter element may be configured as a conventional air filter, especially.

[0061] Practically, it may be that the cover element projects relative to the filter element. The cover element may delimit the filter element. The cover element may be configured as a sectional cylindrical shape. The cover element may be configured as a sectional spherical segment shape. The cover element may delimit a hollow volume. The hollow volume may be configured relative to the air inlet.

[0062] Advantageously, the pressure generating unit may have an air outlet disposed on a side of the pressure generating unit facing away from the air inlet, wherein the air outlet is smaller than the air inlet.

[0063] Advantageously, the injection device may have an air guiding channel in which the pressure generating unit is disposed. The pressure generating unit may be surrounded by the air guiding channel, especially completely surrounded, especially surrounded 360° in a plane. The pressure generating unit may protrude relative to the air guiding channel, especially in the axial direction.

[0064] Advantageously, the air guiding channel may be configured as a bearing element for supporting the pressure generating unit.

[0065] Advantageously, the injection device may have an air guiding channel and a sealing element. The sealing element may be provided for sealing the air guiding channel relative to the pressure generating unit disposed in the air guiding channel.

[0066] The sealing element may be disposed in the air guiding channel and / or surrounded by the air guiding channel.

[0067] Advantageously, the injection device may have a bearing opening that supports the pressure generating unit especially in the radial direction. The bearing opening may receive the pressure generating unit. The bearing opening may surround the pressure generating unit, especially completely surrounded, especially surrounded 360° in a plane. The bearing opening may separate the incoming air flow at the air inlet from the outgoing air flow at the air outlet by means of the pressure generating unit.

[0068] Advantageously, the bearing opening may be delimited by bearing ribs disposed between the air inlet and the air outlet of the pressure generating unit. The air inlet may be disposed on a side facing away from the air outlet. The pressure generating unit may extend through the bearing opening. Advantageously, the pressure generating unit may partially protrude from the air guiding channel.

[0069] Advantageously, the pressure generating unit may have a protrusion, especially a radial protrusion, which supports the pressure generating unit on the bearing opening especially in the axial direction.

[0070] Advantageously, the sealing element may be disposed especially in the axial direction between the especially radial protrusion and the bearing opening.

[0071] Advantageously, the sealing element may be disposed between the pressure generating unit and the air guiding channel wall. The sealing element may be configured as an O-ring.

[0072] The injection device especially has a holding element for holding the nozzle unit especially in a form-fitting manner.

[0073] It is proposed that the injection device has a spring element for adjusting the nozzle parameters of the nozzle unit, in particular the nozzle unit. The spring element is in particular integrally formed with the holding element. The spring element extends in particular when viewed perpendicular to the output axis. The injection device preferably has a spring element for adjusting the nozzle parameters of the nozzle unit, in particular the nozzle unit. "Integrally" should in particular be understood as being connected at least in a materially locked manner, for example by means of a welding process, an adhesive process, an injection molding process and / or other processes meaningful to a person skilled in the art, and / or advantageously understood as being formed in one piece, for example by casting manufacture and / or by single-component or multi-component injection molding manufacture and advantageously from a single blank.

[0074] The holding element can be configured to be substantially annular. The holding element can have a recess, in particular a central recess. The recess can extend through the entire holding element. The recess can be configured as a through-opening.

[0075] Practically, it can be that the holding element has a stop element for positioning the holding element relative to the machine housing. The stop element can be provided for limiting the rotational movement of the holding element about the output axis. The stop element can have a stop surface extending transversely, in particular vertically and along the output axis.

[0076] Practically, it can be that the holding element has a threaded element for connecting the holding element to the machine housing. The threaded element can be configured as an internal thread. When viewed along the output axis, the threaded element can be bounded by the spring element. For establishing the threaded connection, the machine housing has a further threaded element, in particular an external thread. The further threaded element is configured on a hollow cylindrical extension of the machine housing and surrounds the machine housing in the circumferential direction.

[0077] The spring element can be configured as a material spring. The spring element can be formed from a plastic material. The spring element can be directly or indirectly operatively connected to the machine housing. The spring element can be configured as a tension and / or compression spring element. The spring element can exert an elastic force on the nozzle unit along the output axis. The spring element can be provided for exerting an elastic force on the nozzle unit to hold the nozzle unit on the machine housing. The spring element can be configured as a bending spring element. The spring element can be configured as a disc segment spring element. The spring element can be configured as a leaf spring element.

[0078] The spring element can be integrally constructed with the holding element. The spring element can have a fixed end and a loose end facing away from the fixed end. When viewed perpendicular to the output axis, the fixed end can be arranged on the inner side of the holding element. The loose end can be arranged closer to the output axis relative to the fixed end. The spring element can be configured as a clamping wing. The spring element can delimit the extension of the holding element perpendicular to the output axis. The spring element can be configured to be substantially circular-segment-shaped. The spring element can delimit a recess of the holding element.

[0079] The spring element can have a protrusion at its loose end. The protrusion can be provided for forming a contact area with the nozzle unit, in particular a contact surface, a contact line, and / or a contact point.

[0080] The nozzle unit can be optimally adjusted by means of the spring element. Thereby, the tolerance-dependent installation clearance of the nozzle unit can be compensated, and the resulting airtightness can be reduced or prevented. In addition, the movability, in particular the rotatability, between the nozzle unit or the elements of the nozzle unit can still be achieved thereby.

[0081] The rotatability of the nozzle unit or the elements of the nozzle unit relative to each other can be regarded as a nozzle parameter of the nozzle unit. The airtightness can be regarded as a nozzle parameter of the nozzle unit. 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] Practically, the nozzle unit can have a nozzle element for outputting fluid. Practically, the nozzle unit can have an air cap element rotatably supported relative to the nozzle element for outputting an air stream. In the operating state, the air cap element can be locked rotatably relative to the nozzle element. Practically, the nozzle element can have a locking element for a lockable arrangement of the air cap element. The air cap element can be arranged such that it can be locked 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 elements can be configured as uneven surfaces reacting to movement. The locking elements can be configured as locking recesses. For example, the nozzle unit can form a first locking position in a first operating state. Further locking positions can be provided corresponding to additional operating states.

[0084] The nozzle element can be provided in the operating state for receiving the air cap element. The nozzle element preferably surrounds the air cap element, in particular 360° in a plane. In the operating state, the nozzle element preferably extends through the air cap element, in particular through the central region of the air cap element.

[0085] It may also be practically feasible that the injection device has an air cap element for outputting an air flow. The air cap element can be held, especially prestressed, relative to the machine housing, especially indirectly or directly, by means of a spring element. The spring element can prestress the air cap element in the direction of the machine housing.

[0086] It may also be practically feasible that the air cap element has a support element for supporting the air cap element relative to the nozzle element. The support element can extend and project laterally, especially perpendicular to the output axis. The support element can delimit the extension of the air cap element perpendicular to the output axis. The support element can serve as a bracket for the air cap element. The support element is especially arranged on the circumferential side, especially the circumferential surface, of the air cap element. The support element can project relative to the circumferential surface.

[0087] The support element can be configured as a locking element. The support element can be configured to contact the locking geometry of the nozzle element. The support element of the air cap element can be configured to couple with the locking geometry. The locking geometry can be configured to receive the support element. The support element can be locked in a first locking position and a further locking position relative to the locking geometry, especially the locking recess. The support element can be movably supported relative to the nozzle element, especially the collar region of the nozzle element.

[0088] The air cap element can have a deflection element. The deflection element can be provided for deflecting the air flow. The deflection element can be provided for orienting the air flow in a direction transverse to the output axis. The deflection element can have a deflection outlet. The deflection outlet can be configured substantially elliptically in cross section. The deflection outlet can be configured droplet-shaped in cross section. Viewed in the direction of the output axis, the deflection outlet can be configured to converge or narrow in cross section. The deflection outlet can have a first end facing the output axis and a second end facing away from the output axis. The radius of the deflection outlet at the first end can be smaller than the radius at the second end. Thereby, an air flow through the deflection outlet can be provided, which provides an optimized flow velocity.

[0089] The deflection element can have an air flow channel that extends substantially along the output axis through the entire air cap element. The air flow channel can be configured to be curved. The air flow channel can have a substantially straight section extending along the output axis. The air flow channel can have another substantially straight section extending transverse to the output axis. The deflection outlet can have an opening surface delimited by the deflection outlet, which is arranged at the flow end of the air flow channel. The opening surface can be oriented transverse to the output axis.

[0090] The deflection element can extend along the output axis. The deflection element can be configured as a deflection protrusion. The deflection protrusion can delimit the extension of the air cap element along the output axis. The deflection protrusion can project along the output axis. The deflection protrusion can be arranged eccentrically. The deflection protrusion can be arranged at a distance from the output axis. The deflection protrusion can have a side that can be operated by an operator. The side can extend substantially along an axial plane. The deflection protrusion can be provided for rotating the air cap element about the output axis.

[0091] The air cap element can have a flow recess, in particular a centrally arranged flow recess. The flow recess can be provided for receiving the nozzle element in the operating state.

[0092] The deflection element can be provided for acting through the holding element in the operating state.

[0093] Practically, it can be that the nozzle element has a locking element for lockably arranging the air cap element.

[0094] Practically, it can be that the nozzle element is provided for receiving the air cap element in the operating state and surrounding the air cap element in the circumferential direction around the output axis.

[0095] Practically, it can be that the nozzle element can be torsionally connected to the machine housing. The machine housing can have a receiving recess that is provided for receiving and torsionally supporting the nozzle element. The receiving recess can be arranged on the inside of an extension of the machine housing. The receiving recess can be provided for receiving a receiving protrusion of the nozzle element along the conveying axis. The receiving recess can delimit the machine housing along the output axis and perpendicular to the output axis.

[0096] Further practically, it can be that the holding element can be connected to the air cap element, in particular in such a way that the holding element adjusts, in particular rotates, the air cap element from one operating state to, in particular rotates it into, another operating state. The movement of the air cap element, in particular the rotational movement, can be delimited in the circumferential direction around the output axis. The movement of the air cap element can be delimited in the circumferential direction by a spring element.

[0097] The spring element can have a limiting element in the circumferential direction, which is arranged to limit the movement, in particular the rotational movement, of the air cap element, in particular the deflection element. The spring element can provide an adjustment range or a rotational range for the air cap element and limit this adjustment range or rotational range in the circumferential direction around the output axis by means of the limiting element. The rotational range can enable a torsional angle of approximately 90°. The limiting element can limit the extension of the spring element in the circumferential direction around the output axis. The spring element can have a further limiting element, which is arranged on the side of the spring element facing away from the limiting element. The further limiting element can be constructed similarly to the limiting element. Description of the Drawings

[0098] Other advantages result from the following description of the drawings. Embodiments of the invention are shown in the drawings. The drawings and the description contain a combination of numerous features. Those skilled in the art will advantageously also consider these features individually and combine them into other meaningful combinations. Shown here are:

[0099] Figures 1 to 3 A perspective view, a side view and a view in cross-section of the injection device,

[0100] Figure 4 A cross-sectional view of the nozzle unit,

[0101] Figure 5 A perspective view of the nozzle element,

[0102] Figures 6 to 9 The corresponding cross-sectional view of the nozzle unit,

[0103] Figure 10 Two perspective views of a part of the opening limiting unit,

[0104] Figure 11 A cross-sectional view of the fluid receiving unit,

[0105] Figure 12 Multiple views of the fluid transport element,

[0106] Figure 13 With a sealing element Figure 11 Perspective view of the fluid transport element,

[0107] Two embodiments of the cover unit 81 in FIG. 14,

[0108] Figure 15 A cross-sectional view of the injection device,

[0109] Figure 16 Perspective view of the exploded view of the injection device, and

[0110] Figure 17 Perspective view of a part of the injection device.

[0111] In the following figures, identical components are provided with identical reference signs. Detailed Description

[0112] Figure 1 There is shown an injection device 11 for injecting a fluid, which injection device has a pressure generating unit 13 configured as a compressor unit for generating a fluid flow ( Figure 3 , Figure 15 ), and has an electronically commutated drive unit 15 for driving the pressure generating unit 13.

[0113] The injection device 11 has a nozzle unit 17 for outputting the fluid ( Figures 1 to 3 ; Figures 6 to 9 ). The nozzle unit 17 is arranged to inject a first fluid having a first viscosity, such as glaze or varnish, in a first injection state, and to inject a second fluid having a second viscosity different from the first fluid, such as wall paint, in a second injection state.

[0114] The nozzle unit 17 has nozzle parameters by means of which the injection state can be adjusted or changed. Here, the injection state varies according to the nozzle parameters.

[0115] In order to inject the first fluid having a first (low) viscosity, the first injection state can be adjusted by changing the nozzle parameters. In order to inject the second fluid having a second (higher) viscosity, the second injection state can be adjusted by changing the nozzle parameters.

[0116] In order to inject the fluid, the nozzle unit 17 has a nozzle element 19 which has a fluid outlet opening 23 for outputting the fluid.

[0117] The pressure generating unit 13 and the nozzle unit 17 are configured separately from one another and are arranged on two different sides of the injection device 11. The pressure generating unit 13 and the nozzle unit 17 are fluid-technically connected in such a way that the pressure generating unit 13 forms an air flow which causes a force to be exerted on the fluid. For this purpose, the air flow enters the pressure generating unit 13 and exits through the nozzle element 19 of the nozzle unit 17.

[0118] The nozzle unit 17 has a fluid transport area 27 for fluid transport. The nozzle unit 17 has a needle element 31 for controlling or regulating the fluid transport through the nozzle unit 17, in particular through the fluid transport area 27. The nozzle unit 17 has a nozzle element 19 which has a nozzle opening 27 for outputting fluid. The fluid transport area 27 is configured as a fluid flow area delimited by the nozzle element 19 and the needle element 31. The nozzle opening 27 has a circular cross-section. The fluid transport area 27 has an annular cross-section in the injection state. The needle element 31 is provided for delimiting the nozzle opening 27 of the nozzle unit 17 and for effecting fluid transport by changing the nozzle opening 27. Here, 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 the delivery of liquid is reduced or stopped. For this purpose, the needle element 31 is movably supported in the nozzle unit 17. The needle element 31 is provided for adjusting the size of the nozzle opening 27. The needle element 31 extends along a movement axis BA( Figure 4 ) and is movably supported relative to the nozzle element 19. The needle element 31 is arranged in the nozzle element 19 in any state. In the blocked state, the needle element 31 completely penetrates the nozzle opening 27, and in particular the needle element 31 extends from one side of the nozzle element 19 or is arranged on the side facing away from this side.

[0119] The needle element 31 is elastically supported by means of a spring element 35( Figure 3 ). The spring element 35 is arranged at the 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 in such a way that the needle element 31 prevents or avoids fluid leakage in the blocked state.

[0120] The needle element 31 has a constriction or a needle tip at one end which is matched to the nozzle opening 27. The constriction is configured such that it interacts with the nozzle unit 17, in particular the nozzle opening 27, to match the fluid or the first viscosity in the first injection state and the fluid or the second viscosity in the second injection state.

[0121] The fluid transport is greater in the first injection state than in the second injection state, which can be achieved by moving / shifting the needle element 31 in a direction opposite to the nozzle element 19 or the nozzle opening 27. Thereby, the nozzle opening 27 is larger in the first injection state than in the second injection state.

[0122] As the distance between the needle element 31 and 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 increases depending on the geometry.

[0123] The nozzle unit 17 has four guiding elements 39 configured as guiding protrusions for guiding the needle elements 31. The fluid transport region 27 can be delimited by the guiding elements 39. The guiding elements 39 can be arranged on or adjacent to the nozzle opening 27 of the nozzle unit 17. The guiding elements 39 position the needle elements 31 centrally with respect to the nozzle opening 27. The guiding elements 39 sectionally surround the needle elements 31 and extend axially along the needle elements and radially with respect to the needle elements 31. The guiding elements 39 are configured as guiding ribs. The guiding elements 39 delimit the nozzle unit 17. The guiding elements 39 delimit the fluid transport region 27 or the flow rate. The guiding elements are provided for orienting the needle elements 31 relative to one another such that the central axes of the needle elements 31 coincide with the central axis of the nozzle unit 17 or the fluid outlet opening 27.

[0124] The guiding elements 39 delimit the fluid transport region 27 in the circumferential direction around the needle elements 31 and guide the fluid flow. The guiding elements 39 protrude in the direction of the central axis and / or transversely, in particular perpendicularly, to the central axis or the movement axis BA. The guiding elements 39 are provided for delimiting the fluid gap of the nozzle unit 17, which fluid gap is delimited by the needle elements 31 and the nozzle element 19 on the other hand. The guiding elements 39 have a main extension transverse to the central axis.

[0125] The nozzle element 19 is configured conically, wherein the guiding elements 39 are arranged on the inner region of the nozzle element 19. The guiding elements 39 are provided for axially positioning the nozzle element 19 relative to the needle elements 31 along the central axis and radially with respect to the central axis. The guiding elements 39 protrude in the direction pointing towards the central axis. The guiding elements 39 form a conical stop region for the needle elements 31. The needle elements 31 are arranged on the guiding elements 39 and in contact with the guiding elements 39 in any injection state.

[0126] The injection device 11 has an opening delimiting unit 41 for delimiting the movement of the needle elements 31. The opening delimiting unit 41 is provided for adjusting the first injection state relative to the second injection state. The opening delimiting unit 41 is coupled to the needle elements 31. The opening delimiting unit 41 delimits the maximum movement of the needle elements 31 and forms the bottom dead center of the movement of the needle elements 31. The opening delimiting unit 41 is provided for guiding the needle elements 31 along the nozzle unit 17 along the guiding elements 39. The needle elements 31 are guided by or in contact with the guiding elements 39 in any injection state. The opening delimiting unit 41 is prestressed by means of a spring element 35. The opening delimiting unit 41 is arranged on the machine housing 51 and extends through the machine housing 51.

[0127] The opening limit unit 41 has a stop element 43 for limiting the movement of the limit pin element 31. The stop element 43 is configured to be adjustable and is configured as an inclined element 43 / jump platform element. The inclined element 43 has an especially substantially constant slope and is configured to be curved. The inclined element 43 extends around the manipulation axis BDA. The inclined element 43 is rotatably supported around the manipulation axis BDA. The inclined element 43 limits the movement of the manipulation element 47 by means of the adjusted slope. The stop element 43 is arranged on the machine housing 51 and is movably supported relative to the machine housing 51.

[0128] The opening limit unit 41 has a locking element 49 which is provided for providing a plurality of locking positions for the opening limit unit 41. The locking element 49 is provided for maintaining the adjusted locking position.

[0129] The opening limit unit 41 has a manipulation element 47 for manipulating the opening limit unit 41. The manipulation element 47 forms a manipulation function. The manipulation element 47 is provided for changing at least one characteristic parameter for fluid conveyance. The manipulation element 47 is provided for causing a change in at least one characteristic parameter for fluid conveyance by means of a change in the rotational speed of the drive unit 15 or by generating a change in the characteristic parameter by means of the pressure of the drive unit 15. The manipulation element 47 is configured as an adjusting wheel. The manipulation element 47 is arranged rotatably about an axis on the machine housing of the injection device 11. The manipulation element can be integrally configured with the stop element. The manipulation element can be arranged on the machine housing 51.

[0130] The injection device 11 has an operating element 53 for operating the injection device 11, which is supported movably about an operating axis BTA on the machine housing 51 of the injection device 11. The operating element 53 has an operating area 55 for operating the injection device 11. The needle element 31 is arranged between the operating area 55 and the operating axis BTA.

[0131] The operating element 53 is provided for being operated during the operation process to input at least one input parameter. The operating element 53 is provided for receiving the input parameter of the operator during the operation process. The operating element 53 is provided for being indirectly contacted by the operator. The operating element 53 is configured as an electrical and / or mechanical operating element 53. The operating element 53 is provided for moving when operated by the operator. The operating element 53 is provided for changing from a first functional state to a second functional state. The operating element 53 is provided for activating and / or deactivating the drive unit 15. The operating element 53 is provided for switching on and / or off the drive unit 15. The operating element 53 is provided for switching on and / or off the on / off element. The operating element 53 is provided for changing the rotational speed of the drive unit 15 or generating a characteristic parameter by changing the pressure of the drive unit 15.

[0132] The injection device 11 has a spring element 35 for returning the needle element 31 and / or the operating element 53 to the operating state. The spring element 35 is arranged on the needle element 31 and prestresses the needle element 31.

[0133] The injection device 11 has a first air guide channel 95 and a second air guide channel 95, wherein a delimiting element and / or the operating element 53 is arranged between the two air guide channels. The air guide channels open into a single air guide channel 95 in particular.

[0134] The injection device 11 has a fluid receiving unit 61 configured as a fluid container for receiving and / or storing fluid. The fluid receiving unit 61 is configured as a hollow volume and is provided for receiving and outputting fluid. The fluid receiving unit 61 has an open area. The fluid receiving unit 61 is configured to be detachably connected to the machine housing 51 by means of a screw closure element. The fluid receiving unit 61 is surrounded by the machine housing 51 in the connected state. In the 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 parking section for parking / supporting the injection device 11.

[0135] The injection device 11 has a transport unit which is provided for transporting the fluid arranged in the fluid receiving unit 61 from the fluid receiving unit 61 to the nozzle unit 17 for injecting the fluid onto the workpiece to be machined. For this purpose, the transport unit can have a deflector element.

[0136] The injection device 11 has an input opening 69 for generating an air flow into the fluid receiving unit 61. In the connected state, the input opening 69 is completely surrounded by the machine housing 51 and is arranged on the machine housing 51. The air input opening 69 is arranged in the fluid receiving unit 61 in the connected state. The injection device 11 has a sealing element 71 for preventing the backflow of fluid. The sealing elements 71, 91 are provided for covering the input opening 69. The sealing element 71 forms part of a check valve which is provided for preventing paint from flowing back into the air guide channel 95. The sealing element 71 can be configured to be elastic. The sealing element 71 is arranged on the fluid receiving unit 61, on the receiving opening 73 of the fluid receiving unit 61. In the connected state, the sealing element 71 extends along the receiving opening 73 and completely covers the receiving opening. The sealing element 71 is provided for sealing the fluid receiving unit 61. The sealing element 71 is arranged between the machine housing 51 and the fluid receiving unit 61 in the connected state. The sealing element 71 is surrounded 360° in the plane by the machine housing 51 in the connected state. The sealing element 71 is configured as an annular sealing plate.

[0137] The sealing element 71 is configured such that it is elastically deflected when air flows in through the input opening 69.

[0138] The injection device 11 has a tubular fluid transport element 75 for transporting fluid from the fluid receiving unit 61. The fluid transport element 75 is arranged to create a fluid connection from the fluid receiving unit 61 to the machine housing 51. The fluid transport element 75 is configured as a suction tube element and is received completely in the fluid receiving unit 61 in the connected state. 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 the connected state, the fluid transport element 75 is completely surrounded by the machine housing 51 and / or the fluid receiving unit 61 in a plane by 360°.

[0139] The fluid transport element 75 has a holding groove 77 for holding the sealing element 71. The holding groove 77 receives and holds the sealing element 71 at the central recess of the sealing element. The holding groove 77 extends in the circumferential direction around the fluid transport element 75.

[0140] The input 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 input opening 69 is arranged on or within the air inlet area. The input opening 69 is arranged at the holding groove 77 of the fluid transport element 75. The holding groove 77 is completely surrounded by the sealing element 71.

[0141] 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 area 78, a fluid inlet area 79a, and a fluid outlet area 79b. The air inlet area 78 completely surrounds the fluid outlet area 79b. The air inlet area 78 is configured as a can-shaped. In the connected state, in the radial direction, the air inlet area 78 is bounded on the one hand by the fluid transport element 75 and on the other hand by the machine housing 51. In the connected state, the fluid outlet area 79b is arranged between the air inlet area 78 and the fluid inlet area 79a.

[0142] The injection device 11 has a machine housing 51 and has a cover unit 81 covering the machine housing 51.

[0143] The pressure generating unit 13 has an air inlet 14a and an air outlet 14b. The pressure generating unit 13 receives air via the air inlet 14a and releases air via the air outlet 14b. The pressure generating unit 13 is arranged to compress air. The air at the air outlet 14b has a higher air pressure and / or a higher flow rate relative to the air at the air inlet 14a.

[0144] The cover unit 81 has a cover element 83 that covers the air inlet 14a of the pressure generating unit 13. The cover element 83 is arranged at a distance from the pressure generating unit 13. The cover element 83 can cover the projection plane of the air inlet 14a. The projection plane can be formed as a plane parallel to the air inlet 14a, which is arranged substantially perpendicular to the plane of the air inlet. The surface of the projection of the air inlet 14a onto the height of the cover element 83 can be covered by the cover element 83.

[0145] The cover element 83 is entirely formed of an airtight material. The cover unit 83 is formed of a plastic material. The cover element 83 is configured to be spaced apart from the pressure generating unit 13 and from the air inlet 14a. The cover element 83 has a greater extension than the extension of the air inlet 14a parallel to the plane of the air inlet 14a. The cover element 83 completely spans the air inlet 14a. The cover element 83 is configured to be curved in at least one plane and is substantially configured in a dome shape. The cover element 83 has a hollow cylindrical section. The cover element 83 has a spherical shell section. The spherical shell section can be connected to the hollow cylindrical section.

[0146] 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 360° in a plane. The filter element 85 has a honeycomb structure and bounds the cover element 83. The filter element 85 is provided for reducing the ingress of dust and dirt into the injection device 11 or the machine housing 51.

[0147] The cover element 83 projects relative to the filter element 85 and bounds the filter element 85. The cover element 83 is configured as a sectional cylinder. The cover element 83 can be configured as a sectional spherical segment. The cover element 83 bounds a hollow volume. The hollow volume can be configured relative to the air inlet 14a.

[0148] The pressure generating unit 13 has an air outlet 14b arranged on the side of the pressure generating unit 13 facing away from the air inlet 14a. The air outlet is smaller than the air inlet 14a.

[0149] The injection device 11 has an air guiding channel 95 in which the pressure generating unit 13 is arranged. The pressure generating unit 13 is completely surrounded by the air guiding channel 95 in a 360° in a plane and projects axially relative to the air guiding channel 95.

[0150] The air guiding channel 95 is configured as a bearing element for supporting the pressure generating unit 13.

[0151] The injection device 11 has an air guiding channel 95 and a sealing element 91. The sealing element 91 is provided for sealing the air guiding channel 95 relative to the pressure generating unit 13 arranged in the air guiding channel 95. The sealing element 91 is arranged in the air guiding channel 95 and is surrounded by the air guiding channel.

[0152] The injection device 11 has a bearing opening 97 which supports the pressure generating unit 13 in the radial direction. The bearing opening 97 receives the pressure generating unit 13. The bearing opening 97 completely surrounds the pressure generating unit 13 in a plane by 360°. The bearing opening 97 separates the incoming air flow at the air inlet 14a from the outgoing air flow at the air outlet by means of the pressure generating unit 13.

[0153] The bearing opening 97 is delimited by bearing ribs which are arranged between the air inlet 14a and the air outlet 14b of the pressure generating unit 13. The air inlet is arranged on a side opposite to the air outlet 14b. The pressure generating unit 13 extends through the bearing opening 97. The pressure generating unit 13 projects partially from the air guiding channel 95. The pressure generating unit 13 has a radial protrusion 99 which supports the pressure generating unit 13 in the axial direction on the bearing opening 97.

[0154] The sealing element 91 is arranged in the axial direction between the radial protrusion 99 and the bearing opening 97. The sealing elements 71, 91 are arranged between the pressure generating unit 13 and the air guiding channel wall. The sealing element 91 is configured as an O-ring.

[0155] As Figure 16 shown, the injection device 11 has a holding element 101 for positively holding the nozzle unit 17 when viewed along the output axis Aa. The holding element 101 has a spring element 103 for adjusting the nozzle unit 17 or the nozzle parameters of the nozzle unit 17, which spring element is integrally formed with the holding element 101. Thus, the holding element 101 and the spring element 103 are formed by one part, in particular by one casting. The spring element 103 and the holding element 101 are formed from a plastic material. The spring element 103 extends when viewed perpendicular to the output axis Aa. The spring element 103 is configured to adjust the nozzle unit 17 or the nozzle parameters of the nozzle unit 17. The holding element 101 is movably, in particular rotatably, supported relative to the nozzle unit 17 in the operating state. The holding element 101 receives, in particular completely receives, the nozzle unit 17 and surrounds the nozzle unit in the circumferential direction around the output axis Aa.

[0156] The holding element 101 is configured as substantially annular and has a recess 105 arranged centrally when viewed around the output axis Aa. The recess 105 extends through the entire holding element 101 and is configured as a through-opening. The nozzle unit 17 can be arranged in the holding element 101 and can be inserted through the holding element 101 in the operating state.

[0157] The holding element 101 has a stop element 107 for positioning the holding element 101 relative to the machine housing 51. The stop element 107 is configured as a stop projection extending along the output axis Aa. The stop element 107 is provided for delimiting the rotational movement of the holding element 101 about the output axis Aa. For this purpose, the stop element 107 has a stop surface 109 extending substantially perpendicular and along the output axis Aa. The stop surface 109 is arranged at the screwed-in end of the machine housing 51. The stop surface 109 is configured to be substantially perpendicular to the rotational movement of the holding element 101.

[0158] The holding element 101 has a threaded element 111 configured as an internal thread for connecting the holding element 101 to the machine housing 51. Viewed along the output axis Aa, the threaded element is delimited by a spring element 103. It is understood that, for establishing the threaded connection, the machine housing 51 has a further threaded element 113 configured as an external thread. The further threaded element 113 is configured on a hollow cylindrical extension of the machine housing 51 and surrounds the extension about the output axis Aa. The helical movement of the holding element 101 is delimited by the stop element 107 at the screwed-in end of the machine housing 51.

[0159] The spring element 103 is configured as a material spring and is formed of a plastic material. The spring element 103 is operatively connected indirectly to the machine housing 51. The spring element 103 exerts a spring force on the nozzle unit 17 along the output axis Aa. The spring element 103 is provided for exerting a spring force on the nozzle unit 17 to hold the nozzle unit 17 on the machine housing 51. The spring element 103 is configured as a bending spring element 103 or a leaf spring element 103. The spring element 103 is integrally configured 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. Viewed perpendicular to the output axis Aa, the fixed end 121 is arranged on the inner side of the holding element 101. The loose end 123 is arranged closer to the output axis Aa relative to the fixed end 121. The spring element 103 is configured as a clamping wing and delimits the extension of the holding element 101 perpendicular to the output axis Aa. The spring element 103 is configured to be substantially circular-segment-shaped. The spring element 103 delimits the recess 105 of the holding element 101.

[0160] The spring element 103 has a projection 125 on the loose end 123. The projection 125 is provided for forming a particularly defined contact line with the nozzle unit 17.

[0161] 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 outputting fluid. The nozzle unit 17 has an air cap element 127 rotatably supported relative to the nozzle element 19 for outputting an air stream, which air cap element is lockable rotatably relative to the nozzle element 19 in the operating state. The nozzle element 19 has a locking element 131 for the lockable arrangement of the air cap element 127. The nozzle element 19 can be arranged relative to the air cap element 127 to be lockable in a first, second and / or third operating state. The nozzle element 19 has a locking geometry 130, which has a plurality of locking elements 131, which define locking positions. The locking element 131 is configured as an uneven surface counteracting the rotational movement of the holding element 101. The locking element 131 is configured as a locking recess. Here, three locking positions are provided in the three operating states.

[0162] The nozzle element 19 is arranged in an operating state for receiving the air cap element 127. The nozzle element 19 is here in a plane around the air cap element 127 by 360°. In an operating state, the nozzle element 19 extends through the central region of the air cap element 127.

[0163] 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 perpendicular to the output axis Aa. The support elements 135 delimit the extension of the air cap element 127 perpendicular to the output axis Aa. The support elements 135 serve as a support for the air cap element 127. The support elements 135 are in particular arranged on the peripheral surface 137 of the circumferential side of the air cap element 127 and project relative to said peripheral surface.

[0164] The support element 135 is configured 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 can be configured to couple with 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 recess in a first locking position and two further locking positions. The support element 135 can be movably supported relative to the collar region 139 of the nozzle element 19.

[0165] The air cap element 127 has a deflection element 141 which is arranged to deflect the air flow. The deflection element 141 is arranged to direct the air flow in a direction transverse to the output axis Aa. The deflection element 141 has a deflection outlet 143 which is configured to be substantially droplet-shaped in cross-section. Viewed in the direction of the output axis Aa, the deflection outlet 143 is configured to taper or narrow in cross-section. The deflection outlet 143 has a first end facing the output axis Aa and a second end facing away from the output axis Aa. The radius 145 of the deflection outlet 143 at the first end is smaller than the radius 147 at the second end.

[0166] The deflection element 141 has an air flow channel 149( Figure 4 ) which extends substantially along the output axis Aa through the entire air cap element 127. The air flow channel 149 has a substantially straight section 149a extending along the output axis Aa. The air flow channel 149 may have a further substantially straight section 149b extending transverse to the output axis Aa. The deflection outlet 143 has an opening face 151 bounded by the deflection outlet 143, which opening face is arranged at the flow end of the air flow channel 149. The opening face 151 is oriented transverse to the output axis Aa.

[0167] The deflection element 141 extends along the output axis Aa and has two deflection protrusions 153. The deflection protrusions 153 delimit the extension of the air cap element 127 along the output axis Aa. The deflection protrusions 153 project along the output axis Aa and are arranged eccentrically with respect to the output axis Aa or spaced apart from the output axis Aa. The deflection protrusions 153 have a side face 155 which can be operated by an operator. The side face 155 extends substantially along an axial plane. The deflection protrusions 153 are arranged to rotate the air cap element 127 about the output axis Aa.

[0168] The air cap element 127 has a centrally arranged flow recess 159 which is arranged to receive the nozzle element 19 in the operating state.

[0169] The deflection element 141 is arranged to act through the holding element 101 in the operating state.

[0170] The nozzle element 19 has a locking element 131 for a lockable arrangement of the air cap element 127. The nozzle element 19 is configured to receive the air cap element 127 in the operating state and to surround the air cap element in the circumferential direction about the output axis Aa. The nozzle element 19 is torsionally connected to the machine housing 51. For this purpose, the machine housing 51 has a receiving recess 161 which is configured to receive and to torsionally support the nozzle element 19. The nozzle element 19 has a nozzle projection (not shown) corresponding to the receiving recess 161 accordingly. The receiving recess 161 is arranged on the inside of an extension of the machine housing 51 and is configured to receive the receiving projection of the nozzle element 19 along the conveying axis. The receiving recess 105 delimits the machine housing 51 along the output axis Aa and perpendicular to the output axis Aa.

[0171] The retaining element 101 can be connected to the air cap element 127 such that the retaining element 101 rotates the air cap element 127 from one operating state to another in an adjustable manner. The rotational movement of the air cap element 127 is delimited in the circumferential direction about the output axis Aa. The rotational movement of the air cap element 127 is delimited in the circumferential direction by the spring element 103.

[0172] The spring element 103 has a limiting element 165 in the circumferential direction which is configured to limit the rotational movement of the deflection element 141. The spring element 103 provides the adjustment range or rotational range of the air cap element 127 and limits this adjustment range or rotational range in the circumferential direction about the output axis Aa by means of the limiting element 165. The rotational range enables a rotational angle of approximately 90°. The limiting element 165 limits the 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 the side of the spring element 103 facing away from the limiting element 165. The further limiting element 167 is constructed similarly to the limiting element 165.

Claims

1. An injection device, in particular an injection device for injecting a fluid, the injection device comprising: a pressure generating unit (13) for generating a fluid flow; a drive unit (15) for driving the pressure generating unit (13), in particular an electronically commutated drive unit (15); a machine housing (51); a nozzle unit (17) for outputting the fluid along an output axis (Aa), the nozzle unit in particular having a nozzle opening (27); a holding element (101) for holding the nozzle unit (17), in particular in a form-fitting manner, characterized in that A spring element (103) is provided for adjusting the nozzle unit (17), in particular a nozzle parameter of the nozzle unit (17), wherein the spring element is in particular constructed integrally with the retaining element (101), wherein the spring element (103) extends perpendicularly to the output axis (Aa).

2. The spraying device according to claim 1, characterized in that The spring element (103) is designed as a clamping wing, wherein the spring element (103) delimits the extent of the retaining element (101) perpendicular to the output axis (Aa).

3. The spraying device according to any one of the preceding claims, characterized in that The retaining element (101) has a stop element (107) and a threaded element, wherein the stop element is used to position the retaining element (101) relative to the machine housing (51), and the threaded element is used to connect the retaining element (101) and the machine housing (51).

4. Spraying device according to any one of the preceding claims, characterized in that The nozzle unit (17) comprises a nozzle element (19) for discharging a fluid, and an air cap element (127) for discharging an air flow and supported so as to be rotatable relative to the nozzle element (19), wherein the air cap element (127) can be locked so as to be rotatable relative to the nozzle element (19) in an operating state.

5. Spraying device according to any 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. Spraying device according to any 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 (143) which is designed to be essentially drop-shaped in cross section.

7. Spraying device according to any one of the preceding claims, characterized in that Nozzle element (19) output axis (Aa) The nozzle element (19) is configured in an operating state to receive the air cap element (127) and to surround the air cap element around the output axis (Aa).

8. Spraying device according to any 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. Spraying device according to any one of the preceding claims, characterized in that The holding element (101) can be connected to the air cap element (127), in particular in such a way that the holding element (101) can adjust, in particular rotate, the air cap element (127) from one operating state to another operating state, in particular in an adjustable manner.

10. Spraying device according to any one of the preceding claims, characterized in that The spring element (103) has a limiting element (165) which is arranged in a circumferential direction around the output axis (Aa) and is provided for limiting a rotational movement of the deflection element (141).

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