Powder discharge device with a powder thin flow pump

Description

[0001] The present invention relates to a powder dispensing device with a powder dilute pump for conveying powder, in particular coating powder, from a powder reservoir to a powder spraying device. The invention relates in particular to powder dispensing devices and powder spray coating devices which include a powder dilute pump as the powder pump.

[0002] Powder thin-stream pumps within the meaning of this disclosure are, in particular, injectors or injector pumps by means of which powder, especially coating powder, is drawn in by a conveying air stream and then, mixed with the conveying air stream, is conveyed through a discharge line (powder supply line) to a powder spraying device. Such powder conveying is also referred to in this field as powder thin-stream conveying.

[0003] Such a powder dispensing device for conveying thin stream powder is known, for example, from the publications EP 0 606 577 B1, DE 10 2014 215338 A1, DE 44 05 640 A1 or US 4,284,032.

[0004] Unlike dense-phase powder conveying, dilute-phase powder conveying operates under different conditions, as an injector is used as a powder pump to convey the powder or coating powder. A vacuum is created in the injector by means of a conveying or transport air stream. This vacuum draws the powder or coating powder into the transport air stream. The mixture of transport air and powder then flows from the injector, for example, to a powder sprayer connected to the powder dispensing device. The amount of powder conveyed by the injector per unit of time depends primarily on the amount of transport or conveying air flowing through the injector per unit of time.

[0005] The present invention aims to solve the problem of providing a technical solution that simplifies spray coating operations without requiring the operator to forgo good coating quality and coating efficiency.

[0006] This problem is solved in particular by the subject matter of independent claim 1, wherein advantageous further developments of the powder dispensing device according to the invention are specified in the dependent claims.

[0007] Accordingly, a powder dispensing device with a powder thin-stream pump for conveying powder or coating powder from a powder reservoir to a powder spraying device is specified, wherein a control device integrated in the powder dispensing device is provided, which is designed to set at least one parameter that is characteristic with regard to a spray coating process carried out with the powder spraying device and / or with regard to powder conveying carried out with the powder thin-stream pump, wherein the control device forms a unit with the powder thin-stream pump.

[0008] The at least one parameter that is characteristic with regard to a spray coating process carried out with the powder spraying device is, for example, an electrode spray current from one or more high-voltage electrodes of the powder spraying device, a high voltage at one or more high-voltage electrodes of the powder spraying device, a quantity of forming air to be supplied to the powder spraying device per unit of time, a quantity of electrode purging air to be supplied to the powder spraying device per unit of time, a quantity of powder or coating powder to be supplied to the powder spraying device per unit of time, and / or a quantity of transport compressed air to be supplied to the powder spraying device per unit of time together with the powder or coating powder.

[0009] The parameter characterizing at least one powder conveying process effected by the powder dispensing device is, for example, a quantity of powder or coating powder to be conveyed by the powder dispensing device per unit of time, and / or a quantity of transport or conveying air to be conveyed together with the powder or coating powder per unit of time.

[0010] It is particularly preferred that the control device of the powder dispensing device according to the invention has at least one manually operable parameter setting element for setting a target value of at least one parameter that is characteristic with regard to a spray coating process carried out with the powder spraying device, and / or that is characteristic with regard to powder conveyance carried out with the powder dispensing device. In this context, it is advantageous if the control device further comprises an optical display unit for automatically displaying the at least one set target value of the parameter and / or for automatically displaying at least one actual value of the parameter.

[0011] According to embodiments of the powder dispensing device according to the invention, the powder reservoir, to which the powder dispensing device is fluidically connected or connectable, is provided with a fluidizing device, wherein the control device of the powder dispensing device is designed to set the quantity of fluidizing compressed air to be supplied to the fluidizing device per unit of time. In this embodiment, it is also advantageous if the control device has at least one manually operable adjustment element for setting a setpoint value for the quantity of fluidizing compressed air to be supplied to the fluidizing device per unit of time.

[0012] According to embodiments of the powder dispensing device according to the invention, the control unit may also have an interface connection for routing a communication bus from the control unit. This bus is used to set at least one parameter by means of a remote control (external control). Alternatively or additionally, the communication bus is used to transmit the at least one set parameter target value to a remote processing unit.

[0013] This offers the advantage that, depending on requirements, the control unit can also be accessed remotely. In particular, this enables automatic operation, even if the control unit itself lacks a manually operated setting or an optical display. Even if these elements are present, this approach allows for both automatic and manual operation.

[0014] Advantageously, the communication bus is designed as a fieldbus system. In this case, particularly robust and standardized fieldbus systems with high signal transmission capabilities, such as CAN bus or Profibus, can be used to enable easy integration into existing automation systems.

[0015] The powder dispensing device according to the invention has a dual function in particular - in contrast to conventional powder dispensing devices known from the prior art: firstly, the powder dispensing device serves to convey powder or coating powder from a powder reservoir to a powder spraying device which is fluidly connected to the powder dispensing device.

[0016] On the other hand, the powder dispensing device also serves to control, in particular, the powder spraying device which is fluidly connected to the powder dispensing device, in order to spray the powder or coating powder conveyed from the powder dispensing device to the powder spraying device onto the object to be coated.

[0017] In other words, the solution according to the invention offers the particular advantage that separate electronic control units can be dispensed with, thus enabling a more compact and streamlined design of the entire powder coating system. Integrating the control unit into the powder dispensing device also eliminates the otherwise common, complex wiring and the connection of compressed air lines, as this can preferably be done directly at the compressed air connection of the powder dispensing device.

[0018] The control device integrated into the powder dispensing device, or in particular directly connected to it, preferably serves not only to control a powder spraying device connected to the powder dispensing device, but also to set at least some of the parameters that characterize the powder conveying effect of the powder dispensing device. These parameters include, in particular, the quantity of powder or coating powder to be conveyed by the powder dispensing device per unit of time, the quantity of compressed air to be conveyed with the powder or coating powder per unit of time, etc.

[0019] The powder dispensing device according to the invention is suitable for automatic spraying devices (automatic guns) and for manual spraying devices (hand guns). However, particularly with manual spraying devices, the coating quality and efficiency are highly dependent on the operator's experience.

[0020] Therefore, according to a further development of the solution according to the invention, the control unit integrated in the powder dispensing device according to the invention has a storage device with a plurality of spray coating programs, including not only variable parameters but also fixed parameters. The fixed parameters are, in particular, those that are especially critical for the coating quality and / or efficiency and require considerable experience for precise parameter setting, for example, the high voltage of high-voltage electrodes for electrostatically charging the coating material and preferably also the electrode current. The fixed parameters are set to parameter values ​​that have proven particularly advantageous in practice.

[0021] According to preferred implementations of the powder dispensing device according to the invention, the control device of the powder dispensing device is designed as a control module, while the powder thin-stream pump of the powder dispensing device is designed as a pump module.

[0022] In this context, the term "module" refers to an interchangeable component of the powder dispensing device itself. In particular, the powder dispensing device is therefore preferably at least partially modular in design, i.e., composed of several modules.

[0023] The powder dispensing device according to the invention is characterized in particular by its compact design. Integrating the control unit into the powder dispensing device eliminates the need for complex wiring or other connections between a control unit that is typically located externally and the powder dispensing device. Furthermore, the reaction time and responsiveness of the powder dispensing device are improved because only very short pneumatic lines are required to control the valves (especially pinch valves) within the device.

[0024] In particular, the invention allows the powder dispensing device to have compact external dimensions, especially with regard to its width. According to preferred embodiments of the powder dispensing device, it has a width of 20 mm to 150 mm, and preferably between 30 mm and 100 mm. This makes it easy to arrange a plurality of powder dispensing devices directly next to each other on a powder container.

[0025] According to the powder dispensing device according to the invention, the control unit, designed as a control module, has a compressed air control with a compressed air connection (central compressed air connection of the powder dispensing device). Compressed air, in particular from an (external) compressed air source, can be supplied to the compressed air control of the powder dispensing device via the compressed air connection.

[0026] The compressed air control system has at least one compressed air outlet to supply compressed air required for conveying powder or coating powder from the powder dilution pump of the powder dispensing device. The compressed air control system is specifically designed to adjust the amount of compressed air required per unit of time for conveying powder or coating powder from the powder dilution pump, which is supplied via the at least one compressed air outlet of the compressed air control system.

[0027] In this context, it is particularly conceivable if the compressed air control has a first compressed air outlet to provide conveying or transport air, which is required by the powder thin-stream pump of the powder dispensing device for conveying powder or coating powder.

[0028] In addition to this first compressed air outlet, the compressed air control preferably has a further (second) compressed air outlet to provide additional air required by the powder dilution pump of the powder dispensing device for conveying powder or coating powder. In particular, in these embodiments, the compressed air control of the powder dispensing device is designed to adjust the amount of compressed air required per unit of time by the powder dilution pump of the powder dispensing device for conveying powder or coating powder, which is supplied via the first and second compressed air outlets.

[0029] Alternatively or additionally, the compressed air control system may have a compressed air outlet to supply compressed air required by a powder spraying device for spraying powder or coating powder, such as electrode cleaning air, molding air, and / or transport compressed air. This compressed air outlet is sometimes referred to as the "third compressed air outlet," although it can also be provided without the first and second compressed air outlets.

[0030] Preferably, the compressed air control is designed to adjust the compressed air required for spraying powder or coating powder from the powder spraying device (electrode rinsing air, forming air, transport compressed air, etc.), which is supplied via the third compressed air outlet, and which is required per unit of time.

[0031] To adjust the amount of compressed air to be supplied per unit of time at the corresponding compressed air outlet, advantageous embodiments of the powder dispensing device according to the invention provide that a compressed air throttling device is assigned to the corresponding compressed air outlet, which preferably has at least one throttle valve that can be adjusted, in particular by the control unit of the powder dispensing device. The amount of compressed air to be supplied per unit of time via the corresponding compressed air outlet can be adjusted, for example, by means of this throttle valve.

[0032] As already indicated, preferred embodiments of the powder dispensing device according to the invention provide that the powder dilute-flow pump is designed as a pump module and the control unit as a control module. In this context, embodiments of the present invention provide that the powder dilute-flow pump designed as a pump module has a powder conveying injector with a drive nozzle and a collection nozzle, wherein the powder conveying injector has a first compressed air connection through which conveying air can be supplied to the drive nozzle. The powder conveying injector further has a second compressed air connection through which additional air can be supplied to the powder conveying injector. The first compressed air connection of the pump module is fluidly connected to the first compressed air outlet of the control module, while the second compressed air connection of the pump module is fluidly connected to the second compressed air outlet of the control module.

[0033] According to the present invention, the first and second compressed air connections of the pump module are each directly connected to the first and second compressed air outlets of the control module, respectively. This is particularly advantageous when the pump module is directly connected to the control module (preferably detachably).

[0034] Alternatively, it is also conceivable that the first and second compressed air connections of the pump module are each fluidically connected to the first and second compressed air outlets of the pump module, respectively, via a channel formed in a distribution block. In this case, it would be advantageous to connect the pump module to the control module (preferably detachably) via the distribution block in order to form the powder dispensing device.

[0035] If a distributor block is used in the powder dispensing device according to the invention, it is particularly advantageous if this block has a compressed air outlet which is fluidly connected to the third compressed air outlet of the control module via a channel formed in the distributor block.

[0036] The invention relates not only to a powder dispensing device, in particular of the type described above, but also to a system consisting of the powder dispensing device according to the invention and a powder reservoir.

[0037] According to a further aspect, the present invention relates to a powder coating system for powder spray coating of objects, wherein the powder coating system comprises a powder dispensing device of the aforementioned type and at least one powder spraying device connected to the powder dispensing device via a powder supply line. The powder coating system according to the invention is particularly characterized in that all parameters adjustable with regard to the operation of the at least one powder spraying device are adjustable via the control unit of the powder dispensing device. Therefore, it is a particularly compact system, which makes spray coating operation simpler and more cost-effective for the operator without compromising on good coating quality and efficiency.

[0038] According to a further aspect, the present invention relates to a system with a powder dispensing device of the aforementioned type and with a powder reservoir, wherein the powder dispensing device is arranged directly on the powder reservoir and a powder inlet of the powder dispensing device opens into a powder chamber of the powder reservoir via a suction line. For example, the powder reservoir has at least one powder container with a powder chamber, wherein a powder dispensing channel is formed in a side wall of the powder container, and wherein the powder inlet of the powder dispensing device is or can be fluidically connected to the powder dispensing channel via a suction pipe nozzle.

[0039] According to this aspect of the present invention, the powder dispensing device, and in particular the powder dilute-flow pump of the powder dispensing device, is connected or connectable to the powder dispensing channel opening into the powder chamber via a powder dispensing port. This results in a particularly short suction distance, which improves the adjustability and reproducibility of the powder flow. Finally, the system according to the invention significantly reduces the space requirement.

[0040] In a preferred embodiment of the system according to the invention, it is provided that the powder dispensing channel is formed in a side wall of the powder container and that the powder dispensing device or the powder thin-stream pump of the powder dispensing device is connected or connectable to the powder dispensing channel via a suction pipe nozzle.

[0041] By integrating the powder discharge channel into the side wall of the powder container, the powder dilution pump of the powder discharge device can be positioned particularly close to the powder container. This places the powder dilution pump of the powder discharge device at a very short distance from the powder discharge opening. Consequently, the work required to convey the coating powder through the powder discharge channel using the powder dilution pump is significantly reduced. The short suction distance also has a positive effect on the adjustability and reproducibility of the powder flow. The powder dilution pump of the powder discharge device can be connected to the powder discharge channel via a separate suction pipe connection. With the aid of the suction pipe connection, it is conceivable to retrofit existing powder containers with the powder discharge device according to the invention.The powder thin-flow pump can be retrofitted to the powder dispensing device.

[0042] Additionally, the powder dispensing device may also have a suction tube which is or can be connected to a through-bore of the powder container's suction tube nozzle. The suction tube should be designed in such a way that it can be inserted into the powder dispensing channel of the powder container.

[0043] The intake tube, which is connected or connectable to the intake tube nozzle, allows for easy variation of the powder discharge channel's inner diameter. Specifically, the intake tube can have an inner diameter of 5 mm to 8 mm, and preferably approximately 4 mm. Reducing the diameter of the powder discharge channel with the intake tube improves the suction performance of the powder dilute pump in the powder dispensing device. This is primarily due to the reduced amount of powder within the discharge channel and the slower venting of the powder.

[0044] Exemplary embodiments of the powder dispensing device according to the invention are described in more detail below with reference to the accompanying drawings.

[0045] They show: FIG. 1 schematically shows an exemplary embodiment of the powder dispensing device according to the invention in a sectional view, including a powder dilute-flow pump; FIG. 2 schematically shows a powder conveying injector in a sectional view, which is used in the powder dispensing device according to FIG. 1 The powder thin-stream pump used in an extended state; FIG. 3 schematically in a sectional view of the powder conveying injector according to FIG. 2 in its state installed in a housing of the powder thin-flow pump; FIG. 4 schematically in a sectional view another exemplary embodiment of the powder dispensing device according to the invention with a powder thin-flow pump; FIG. 5 schematically in an exploded view the exemplary embodiment of the powder dispensing device according to the invention. FIG. 4 FIG. 6 schematically and in an isometric view an exemplary embodiment of the system according to the invention with a plurality of powder dispensing devices according to FIG. 4 and a powder container as a powder reservoir; and FIG. 7 the powder container of the system according to the invention FIG. 6 without powder dispensing devices and without container lids.

[0046] FIG. 1 Figure 1 schematically and in a sectional view shows a preferred embodiment of the powder dispensing device 50 according to the invention, which has a powder thin-flow pump 51 and is used for conveying powder or coating powder from a (in FIG. 1 (not shown) powder reservoir to a (also in FIG. 1 (not shown) powder spray device.

[0047] The powder spraying device can be a manually operated spray gun or an automatically controlled sprayer. It preferably includes at least one high-voltage electrode, which is supplied with high voltage from a high-voltage source for the electrostatic charging of the coating powder sprayed by the powder spraying device. The high-voltage source can be integrated into the powder spraying device. The powder spraying device can have a spray nozzle or a rotary atomizer.

[0048] A powder reservoir as defined in the present disclosure preferably has at least one powder container with a powder chamber from which powder or coating powder is drawn by means of a vacuum using the powder thin-flow pump 51 of the powder dispensing device 50, after which the powder or coating powder flows under overpressure from the powder thin-flow pump 51 to a corresponding powder spraying device.

[0049] The powder container preferably has at least one powder outlet opening to which the powder inlet of the powder dispensing device 50 is connected. In particular, it is conceivable that the at least one powder outlet opening of the powder container is arranged in a side wall of the powder container.

[0050] The powder chamber of the powder reservoir can be equipped with a fluidizing device for fluidizing the coating powder contained in the powder chamber of the powder container. The fluidizing device can include at least one fluidizing wall made of an open-pored material or a material with narrow bores, which is permeable to compressed air but not to powder or coating powder. In this context, it is particularly advantageous if, in the powder container of the powder reservoir, the fluidizing wall forms the bottom of the powder container and is arranged between the powder chamber of the powder container and a fluidizing compressed air chamber. The fluidizing compressed air chamber can be connected to a suitable compressed air source via the powder dispensing device 50 and a compressed air control 60 integrated in the powder dispensing device 50, as described in more detail below.

[0051] An exemplary embodiment of a powder reservoir designed as a powder container within the meaning of the present disclosure is described, for example, in publication EP 2 675 574 A2.

[0052] The exemplary embodiment of the powder dispensing device 50 according to the invention, as shown schematically in FIG. 1 The device shown is characterized by a modular design and essentially consists of a control unit 52 designed as a control module and a powder thin-stream pump 51 designed as a pump module. These two modules (control module and pump module) are preferably detachably connected to each other in order to form a particularly compact powder dispensing device 50.

[0053] As in FIG. 1 As shown schematically, the powder dispensing device 50 according to the invention, and in particular the pump module of the powder dispensing device 50, has a powder inlet 80 which is connected by means of a (in FIG. 1 (not shown) powder line, in particular with the aid of a suction pipe or the like, flow-wise with the already mentioned and in FIG. 1 connected or connectable to the powder reservoir not shown.

[0054] A powder outlet 81 is provided at an opposite end region of the powder dispensing device 50 and, in particular, of the pump module of the powder dispensing device 50. This outlet is operated by means of a FIG. 1 The powder line not shown is connected or connectable to a powder inlet of a powder spraying device (especially a coating gun) in a flow direction, in particular by means of a powder hose.

[0055] Specifically, the following are the details of the in FIG. 1 In the exemplary embodiment shown, both the powder inlet 80 of the powder dispensing device 50 and the powder outlet 81 of the powder dispensing device 50 are each designed as a hose connection fitting to which the corresponding powder line / powder hose can be attached and, for example, fixed with a hose clamp.

[0056] Of course, other embodiments for the powder inlet 80 or the powder outlet 81 of the powder dispensing device 50 and in particular of the pump module of the powder dispensing device 50 are also possible.

[0057] Preferably, the powder inlet 80 and the powder outlet 81 lie on a common longitudinal axis L (see Figure 1). FIG. 3 ), in order to ensure that the powder / coating powder to be conveyed is not deflected or at least only slightly deflected within the powder thin-flow pump 51, which significantly reduces the turbulence of the powder-air mixture in the powder thin-flow pump 51.

[0058] The pump module of the powder dispensing device 50 according to the in FIG. 1 The illustrated embodiment features a powder low-flow pump 51, which operates according to the injector or Venturi tube principle. For this purpose, the powder low-flow pump 51 has a powder conveying injector 100 in which an air jet generates a vacuum in a low-pressure area formed by a channel widening. This vacuum is used to draw powder or coating powder from the powder reservoir via the powder inlet of the pump module / powder dispensing device 50. The drawn-out powder or coating powder is entrained by the air jet and conveyed to the powder spraying device. By adjusting the airflow rate, the vacuum and thus the amount of powder conveyed can be controlled.

[0059] The following section will initially refer to the descriptions in FIG. 2 und 3 An exemplary embodiment of a powder conveying injector 100 is described in more detail, which is suitable for use in the powder thin-flow pump 51 of the powder dispensing device 50 according to the invention.

[0060] The exemplary embodiment of the powder conveying injector 100 has a first region, which serves as a drive nozzle 1, and a second region, which serves as a collection nozzle 11. The second region of the powder conveying injector 100, which serves as a collection nozzle 11, has a channel with a longitudinal axis L inside it, serving as a jet-catching channel 12. A mixture of powder or coating powder and conveying air flows through this channel when the powder conveying injector 100 is used, for example, in a powder dilution pump 51 for powder conveying.

[0061] The channel, which is hereinafter also referred to as beam trap channel 12 or powder flow channel, has a longitudinal axis L, wherein in FIG. 2 The flow direction is indicated by an arrow. The mixture to be conveyed, consisting of powder / coating powder and conveying air, enters the second area, which serves as a collecting nozzle 11, through a funnel-shaped nozzle inlet 13 and exits the collecting nozzle 11 again through a nozzle outlet 14.

[0062] At least in the area of ​​the nozzle inlet 13 and in the area of ​​the nozzle outlet 14, the second area, which serves as a trap nozzle 11, is cylindrical on the outside, so that corresponding cylindrical guide surfaces 15, 15' are formed.

[0063] The first section of the powder conveying injector 100, located upstream of the second section (capture nozzle 11), functions as a drive nozzle 1. The first section (drive nozzle 1) essentially consists of a drive nozzle housing 2 with a conveying air channel 3 and a nozzle 4 flow-connected to the conveying air channel 3, the nozzle opening of which is axially opposite the jet capture channel 12.

[0064] Although in FIG. 2 Not shown, it is conceivable that the nozzle 4 or the nozzle opening is formed by a nozzle mouthpiece, which is designed as a metal insert and can in particular be inseparably connected to the drive nozzle housing 2.

[0065] At the in FIG. 2 The powder conveying injector 100, shown schematically in a sectional view, can be designed such that the first section, serving as the drive nozzle 1, and the second section, serving as the collection nozzle 11, are combined as a single component and inseparably joined together. In this context, it is fundamentally conceivable to form the first and second sections 1, 11 of the powder conveying injector 100 in one piece from the same material, for example as an injection-molded component.

[0066] Alternatively, and as in FIG. 2 As schematically indicated, the first and second sections 1, 11 of the powder conveying injector 100 can also be formed separately, whereby these two sections 1, 11 can then be detachably or permanently connected to each other, for example by plugging, gluing or crimping. This would have the advantage that the two sections 1, 11 of the second section 11 of the powder conveying injector 100 could be made of different materials, in particular different plastic materials.

[0067] A further advantage of this embodiment is that the second section 11 of the powder feed injector 100, which is rotationally symmetrical with respect to the longitudinal axis L of the beam trap channel 12, can be designed as a turned part. This particularly simplifies the manufacturing and assembly of the second section 11 of the powder feed injector 100. Furthermore, the second section 11 of the powder feed injector 100 can be replaced individually if necessary, i.e., without the first section 1 of the powder feed injector 100.

[0068] The exemplary embodiment of the powder conveying injector 100, as shown schematically, for example, in FIG. 2 The powder conveying injector 100, as shown in a sectional view, is further characterized by the fact that it is a so-called "inline" powder conveying injector 100, which means that the powder / coating powder to be conveyed by the powder conveying injector 100 flows axially along the longitudinal axis L of the beam trap channel 12 through the entire powder conveying injector 100 (and preferably also through the entire powder thin-stream pump 51).

[0069] In particular, in the exemplary embodiment of the powder conveying injector 100, it is provided that the first region 1 of the powder conveying injector 100 has a powder inlet 5 which is axially opposite the nozzle outlet 14 of the second region (capture nozzle 11) or the powder outlet of the powder thin-stream pump 51.

[0070] This axial arrangement of the powder inlet 5 and powder outlet 14 ensures that the powder / coating powder to be conveyed is not deflected, or at least only slightly deflected, within the powder conveying injector 100, which significantly reduces the turbulence of the powder-air mixture in the powder conveying injector 100.

[0071] Furthermore, the powder-air mixture in the powder conveying injector 100 experiences only minimal flow resistance, which overall increases the conveying capacity achievable with the powder conveying injector 100 for the same amount of conveying air.

[0072] In detail, and as in FIG. 2 As shown schematically, the first section of the powder conveying injector 100, which serves as the drive nozzle 1, is essentially cylindrical and has a drive nozzle housing 2 with an essentially cylindrical outer surface. This drive nozzle housing 2 defines, at least partially, a conveying air channel 3 internally, which is arranged axially or at least substantially axially with respect to the longitudinal axis L of the jet trap channel 12. A nozzle projection 6 extends into the conveying air channel 3, in which the nozzle opening 4 of the drive nozzle 1 is formed.

[0073] The nozzle opening 4 is fluidically connected via the conveying air channel 3 to a conveying air inlet 7, which is arranged and aligned non-axially with respect to the longitudinal axis L of the channel of the second section 11, which serves as a jet trap channel 12. On the other hand, as already explained, the nozzle opening 4 of the drive nozzle 1 is arranged axially with respect to the longitudinal axis L of the jet trap channel 12.

[0074] During operation of the powder feed injector 100, conveying air is supplied to the drive nozzle 1 via the conveying air inlet 7. This air flows out through the nozzle opening 4 of the drive nozzle 1 towards the jet trap channel 12. Due to the nozzle-shaped arrangement of at least the upstream section of the jet trap channel 12, the conveying air is forced into the trap nozzle 11. Because of the relatively small diameter of the nozzle opening 4 of the drive nozzle 1, a high-velocity airflow is generated, creating a vacuum in the area of ​​the powder inlet 5 of the powder feed injector 100. This vacuum, which forms in the powder inlet area during operation of the powder feed injector 100, draws in coating powder when the powder inlet 5 of the first section 1 of the powder feed injector 100, which serves as the drive nozzle 1, is connected via a powder channel of the powder dilution pump 51 and / or via a powder line, etc.flow-wise, it is connected to a corresponding powder container or the like.

[0075] As in FIG. 2 As schematically indicated, the drive nozzle housing 2 has a cylindrical inner contour at its downstream end region, into which the upstream end region of the second region 11 of the powder conveying injector 100, i.e. the upstream end region of the region of the powder conveying injector 100 serving as a catch nozzle 11, can be inserted and connected to the drive nozzle housing 2 either detachably or indetachably (for example by clamping, gluing or by pressing).

[0076] In summary, the first and second sections 1, 11 of the powder feed injector 100 are thus combined and joined together as a single component. These two combined sections 1, 11 have an overall outer contour that is preferably rotationally symmetrical with respect to the longitudinal axis L of the jet trap channel 12. In this way, the powder feed injector 100 can be inserted arbitrarily into a receptacle 21 of a housing 20 of the powder thin-stream pump 51 without the user having to pay attention to a specific orientation of the nozzle arrangement 100.

[0077] As shown in the schematic sectional view FIG. 2 Furthermore, the powder conveying injector 100 is provided with corresponding seals 8, via which the powder conveying injector 100 can be sealed against a housing 20 of the powder thin-flow pump 51 when the powder conveying injector 100 is received in the housing 20 of the powder thin-flow pump 51.

[0078] In particular, it is preferred that at least two circumferential sealing areas 8a, 8b are provided, wherein a groove or annular groove 22 is formed between the two circumferential sealing areas 8a, 8b. The conveying air inlet 7 of the drive nozzle 1 also opens into this area where the groove or annular groove 22 is formed between the two circumferential sealing areas 8a, 8b.

[0079] FIG. 3 schematically and in a sectional view shows the exemplary embodiment of the powder conveying injector 100 according to FIG. 2 in a state in which the powder conveying injector 100 is at least partially enclosed in a housing 20 of the powder thin-flow pump 51.

[0080] As shown, the housing 20 of the powder thin-stream pump 51 has a receptacle 21 whose size is adapted to the outer diameter and outer configuration of at least the upstream end region of the first section (drive nozzle 1) of the powder feed injector 100. The sealing rings 8a, 8b of the powder feed injector 100 seal at least the upstream end region of the powder feed injector 100 against the wall of the receptacle 21 provided in the housing 20 of the powder thin-stream pump 51.

[0081] The representation in FIG. 3 It can also be seen that the groove or annular groove 22 formed between the two circumferential sealing areas 8a, 8b of the powder conveying injector 100 forms an annular space with the wall of the receptacle 21 of the housing 20 of the powder thin-stream pump 51, wherein this annular space is fluidically connected via a conveying air connection 23 formed in the housing 20 of the powder thin-stream pump 51.

[0082] The schematic sectional view in FIG. 3 It can also be seen that a powder line connection 24 is attached to the downstream end region of the second region of the powder conveying injector 100 (capture nozzle 11) and is in particular detachably connected to the downstream end region.

[0083] The powder line connection 24 has a receiving channel arranged axially with respect to the longitudinal axis L of the jet trap channel 12, in which at least the downstream end region of the trap nozzle 11 can be received. Furthermore, as in FIG. 3 schematically indicated - the powder line connection 24 shall have a corresponding seal 25 in order to seal in particular the powder line connection 24 against the housing 20 of the powder thin-flow pump 51.

[0084] The powder line connection 24 can be attached to the downstream end of the collection nozzle 11 in such a way that an annular space 26 is formed, bounded by the housing 20 of the powder low-flow pump 51, the powder line connection 24, and the powder feed injector 100. This annular space is fluidically connected to an additional air channel 27 formed in the housing 20 of the powder low-flow pump 51. Additional air can be supplied to the annular space 26 via this additional air channel 27 and added to the powder-air mixture conveyed by the powder feed injector 100.

[0085] Returning to the presentation in FIG. 1 The exemplary embodiment of the powder dispensing device 50 according to the invention is described in more detail below, in which a powder thin-flow pump 51 is connected to the powder conveying injector 100 according to FIG. 2 is used.

[0086] During operation of the powder dispensing device 50, conveying air is supplied to the drive nozzle 1 of the powder conveying injector 100 via the conveying air inlet 7. This air flows out through the nozzle opening of the drive nozzle 1 towards the jet trap channel 12. Due to the nozzle-shaped arrangement of at least the flow-displacement area of ​​the jet trap channel 12, the conveying air is forced into the trap nozzle 11. Because of the relatively small diameter of the nozzle opening of the drive nozzle 1, a high-velocity airflow is formed, creating a vacuum in the area of ​​the powder inlet of the powder conveying injector 100. This vacuum, which forms in the powder inlet area during operation of the powder dispensing device 50, draws in powder or coating powder when the powder inlet of the first area of ​​the powder conveying injector 100, which serves as the drive nozzle 1, is closed via a powder line, etc.is fluidically connected to a corresponding powder container or the like.

[0087] As shown in the schematic sectional view FIG. 1 Furthermore, the powder conveying injector 100 is included in a receptacle of the powder thin-flow pump 51, which is designed as a pump module, so that the pump module serves as housing 20 or injector housing with regard to the powder conveying injector 100.

[0088] In addition to the powder conveying injector 100 described above, the powder thin-flow pump 51 of the powder dispensing device 50 according to the invention, designed as a pump module, has a pinch valve 40 which is arranged in a flow path between the powder inlet 80 of the pump module and the powder inlet 5 of the drive nozzle 1 of the powder conveying injector 100.

[0089] This pinch valve 40 is preferably controllable by a control device 52 belonging to and integrated into the powder dispensing device 50, in order to interrupt, as required, a flow connection between the powder inlet 80 of the pump module and the powder inlet 5 of the drive nozzle 1 of the powder conveying injector 100. Such an interruption of the flow path preferably takes place during a cleaning operation of the pump module of the powder dispensing device 50, as will be described in more detail below.

[0090] Furthermore, a compressed air inlet device 30 is provided between the pinch valve 40 and the powder inlet 5 of the drive nozzle 1 of the powder feed injector 100 in order to supply compressed air to the powder feed injector 100 as required. In detail, the following is described in FIG. 1 In the exemplary embodiment of the powder dispensing device 50 shown in the invention, it is provided that the compressed air inlet device 30 is arranged in the flow path between the pinch valve 40 and the powder inlet 5 of the drive nozzle 1 of the powder conveying injector 100.

[0091] The pump module itself has a first compressed air connection 7, through which conveying air can be supplied to the drive nozzle 1 of the powder feed injector 100. In addition, the pump module has a second compressed air connection 27, through which additional air can be supplied to the powder feed injector 100.

[0092] In addition, the pump module has a third compressed air connection, via which compressed air can be supplied to the compressed air inlet device 30 as required, and a fourth compressed air connection, via which a corresponding control pressure can be supplied to the pinch valve 40 for actuating the pinch valve 40.

[0093] The pressures required for operating the powder thin-stream pump 51, designed as a pump module, are provided by a corresponding compressed air control 60 of the control unit 52, designed as a control module, of the powder dispensing device 50. For this purpose, the compressed air control 60 of the control unit 52, designed as a control module, has a (central) compressed air connection 64, through which compressed air is supplied to the compressed air control 60 from a compressed air source (in FIG. 1 (not shown) can be supplied.

[0094] The compressed air control 60 also has a plurality of compressed air outlets 65 to 69, through which compressed air is provided that is required for conveying powder or coating powder from the powder thin-stream pump 51, or that is required by a powder spraying device connected to the powder dispensing device 50 during a spray coating process.

[0095] As will be explained below, the compressed air control 60 of the control unit 52 designed as a control module of the powder dispensing device 50 according to the invention is designed in particular to adjust the amount of compressed air required per unit of time, which is provided via at least some of the plurality of compressed air outlets 65 to 69 of the control module.

[0096] In detail, and as in FIG. 1 As schematically indicated, the control unit 52 of the powder dispensing device 50 according to the invention, designed as a control module, has a first compressed air outlet 65 assigned to the compressed air control 60 in order to provide conveying air which is required by the powder thin-flow pump 51 of the pump module for conveying powder or coating powder.

[0097] Furthermore, the control unit 52, designed as a control module, has a second compressed air outlet 66 assigned to the compressed air control 60, through which the additional air is provided which is required by the powder thin-flow pump 51 of the pump module for conveying powder or coating powder.

[0098] At the in FIG. 1 In the exemplary embodiment of the powder dispensing device 50 shown, the control unit 52, designed as a control module, or the corresponding compressed air control 60, has a third compressed air outlet 69 through which compressed air is supplied. This compressed air is required by a powder spraying device connected to the powder dispensing device 50 for spraying powder or coating powder. This compressed air is, in particular, electrode cleaning air, forming air, transport compressed air, etc.

[0099] It is provided that the compressed air control 60 of the control unit 52 designed as a control module of the exemplary embodiment of the powder dispensing device 50 according to the invention is designed to adjust the quantity of compressed air to be supplied per unit of time at the first, second and third compressed air outlet 65, 66, 69 of the control module.

[0100] For this purpose, each of the corresponding compressed air outlets 65, 66, 69 of the control module is assigned a compressed air throttling device 59, each of which has at least one throttle valve that can be adjusted, in particular, by the control unit 52 of the powder dispensing device 50. The quantity of compressed air to be supplied per unit of time via the corresponding compressed air outlet of the control module can then be adjusted via this throttle valve.

[0101] The use of such compressed air throttling devices 59 or throttling valves in the powder dispensing device 50 according to the invention is particularly advantageous because, in order to achieve good coating qualities and a good efficiency with regard to the required amount of powder or coating powder, it is particularly important to be able to adjust the required compressed air flows precisely and thus in fine small steps or steplessly and thus continuously.

[0102] The compressed air throttling devices 59, which are assigned to the first, second, and third compressed air outlets 65, 66, 69 of the control unit 52 designed as a control module, each have a throttle valve and a controllable electric motor with a motor shaft for adjusting the throttle valve. The motor can be any type of motor whose motor shaft can be controlled and adjusted to defined angular positions. An electric stepper motor is preferred.

[0103] As in FIG. 1 As indicated, the third compressed air outlet 69 of the control unit 52, designed as a control module, is not (flow-wise) connected to the pump module, but opens into a compressed air outlet 70 of a distributor block 53, wherein this compressed air outlet 70 of the distributor block 53 is flow-wise connected to the third compressed air outlet 69 of the control module via a channel 57 formed in the distributor block 53.

[0104] The other compressed air outlets of the control module, i.e., the first, second, fourth, and fifth compressed air outlets 65 to 68, are fluidically connected to corresponding compressed air inlets of the pump module. In addition, the following applies in FIG. 1 In the schematically illustrated embodiment of the powder dispensing device 50 according to the invention, corresponding channels 55, 56, 58 formed in the distributor block 53 already mentioned are used.

[0105] The manifold block 53 not only serves to connect the corresponding compressed air outlets of the control module to the corresponding compressed air connections of the pump module, but also to connect the pump module to the control module. The manifold block 53, which can be, for example, a single-piece block of material in which all the channels necessary for supplying the pump module with compressed air are integrated, provides optimized interfaces, particularly with regard to the pump module on the one hand and the control module on the other, in order to avoid any sealing problems between the channels of the manifold block 53 and the compressed air outlets of the control module or the compressed air inlets of the pump module.

[0106] Furthermore, the channels formed in the distributor block 53 are designed to be as short as possible and represent the smallest possible volumes that must be either evacuated or filled with compressed air during operation of the pump module. This reduces the reaction delay of the pump module and allows for an increased response time.

[0107] Of course, it is also conceivable to connect the pump module and the control module directly if the compressed air outlets of the control module can be directly connected to the corresponding compressed air inlets of the pump module.

[0108] The control unit 52 of the powder dispensing device 50 according to the invention, designed as a control module, is integrated into the powder dispensing device 50 in order to achieve the most compact design possible for the powder dispensing device 50. In particular, the powder dispensing device 50 advantageously has a modular design in which the components "powder dilution pump 51" and "control unit 52" are each designed as a modular component, with these two modular components being connected to each other via the distributor block, which also has a modular design. The pump module itself can have a modular design consisting, for example, of the individual modules "powder inlet 80", "pinch valve 40", "compressed air inlet device 30", and "powder conveying injector 100".

[0109] The control device 52 belonging to the control module serves not only to set and regulate or control at least one parameter that is characteristic with regard to a spray coating process effected by a powder spray device connected with the powder dispensing device 50 or at least one parameter that is characteristic with regard to a powder conveyance effected by the powder thin-flow pump 51 of the pump module, but also to set the corresponding electrical quantities.

[0110] For this purpose, the control unit 52 has a corresponding electrical connection and an electrical control board (main board). Furthermore, the control unit 52 is assigned an interface connection 62 for bringing out a communication bus from the control unit 52, which is designed for setting at least one parameter by means of a remote control and / or for transmitting at least one set parameter value to a remote processing unit. The interface connection can, for example, have a parallel or serial interface.

[0111] Furthermore, a powder spraying device connected to the powder dispensing device 50 can be supplied with electrical control signals or electrical energy via the interface port 62.

[0112] The control device 52 is specifically designed to set at least one of the following parameters which characterize a spray coating process carried out with the powder spraying device: an electrode spray current from one or more high-voltage electrodes of the powder spraying device; a high voltage at one or more high-voltage electrodes of the powder spraying device; a quantity of electrode purging air to be supplied to the powder spraying device per unit of time; a quantity of forming air to be supplied to the powder spraying device per unit of time.

[0113] Alternatively or additionally, the control device 52 is designed to set at least one of the following parameters which characterize powder delivery effected by the powder dispensing device 50: a quantity of powder or coating powder to be conveyed per unit of time by the powder dispensing device 50; a quantity of transport compressed air to be conveyed per unit of time together with the powder or coating powder.

[0114] Although in FIG. 1 Although not shown, it is conceivable in this context that the control device 52 has at least one manually operable parameter setting element 61 to set a parameter setpoint of at least one parameter that is characteristic with regard to a spray coating process carried out by the powder spraying device, or that is characteristic with regard to powder conveyance carried out by the powder dispensing device 50. Furthermore, it is conceivable in this context that the control device 52 has an optical display unit for displaying the at least one set parameter setpoint and / or for displaying a corresponding parameter actual value.

[0115] Furthermore, it is conceivable that the control device 52 is designed to carry out spray coating processes, wherein the control device 52 has a storage device 63 with a plurality of spray coating programs, wherein each spray coating program contains at least one adjustable parameter, wherein the control device 52 has at least one manually operable parameter setting element for setting a parameter setpoint of the at least one adjustable parameter, and wherein the control device 52 has an optical display unit for automatically displaying the at least one set parameter setpoint.

[0116] The control unit 52 can further be configured to preferably automatically perform a cleaning (rinsing) of the pump module, which is necessary, for example, after a powder change. For this purpose, it is conceivable that the control module exerts a corresponding actuating pressure on the pinch valve 40 of the pump module via the fifth compressed air outlet in order to close the pinch valve 40. Then, purge air can be supplied to the compressed air inlet device 30 of the pump module via the fourth compressed air outlet to flush the powder injector of the pump unit and the piping system to a powder spray device fluidically connected to the pump unit of the powder dispensing device 50. Simultaneously or in parallel, compressed air can also be supplied to the pump module via the first and second compressed air outlets.

[0117] The following refers to the representations in FIG. 4 and FIG. 5 A further exemplary embodiment of the powder dispensing device 50 according to the invention is described.

[0118] In short, the exemplary embodiment of the powder dispensing device 50 has a structure which is in principle the same as the structure of the one described previously with reference to the illustrations in FIG. 1 bis FIG. 3 The powder dispensing device described corresponds to 50.

[0119] Accordingly, the further exemplary embodiment of the powder dispensing device 50 according to the invention has a powder thin-stream pump 51 to convey powder, in particular coating powder, from a powder reservoir to a powder spraying device.

[0120] Furthermore, a control device 52 integrated in the powder dispensing device 50 is provided, which is designed to be able to adjust at least one parameter that is characteristic with regard to a spray coating process effected with the powder spraying device and / or with regard to a powder conveying effected with the powder thin-flow pump 51.

[0121] In a further exemplary embodiment of the powder dispensing device 50 according to the invention, it is also provided that the control device 52 forms a single unit with the powder thin-flow pump 51.

[0122] The control unit 52 of the further exemplary embodiment of the dispensing device 50 according to the invention corresponds in structural and functional terms to that previously described with reference to the illustrations in the FIGS. 1 bis 3 described control device 52. To avoid repetition, reference is therefore made here to the previous explanations.

[0123] In the further exemplary embodiment of the powder dispensing device 50 according to the invention FIG. 4 and according to FIG. 5 A powder thin-stream pump 51 is used, which - in comparison to the embodiment according to FIG. 1 bis FIG. 3 - has a more compact design.

[0124] In addition, the powder thin-flow pump 51 is used according to FIG. 4 and FIG. 5 A powder conveying injector 100 is used, as previously described, at least in principle, with reference to the illustrations in the FIGS. 2 und 3 was described.

[0125] However, in the embodiment according to FIG. 4 and FIG. 5 The powder feed channel, which is fluidically connected to a powder hopper, is designed to be slightly angled relative to the conveying axis. This allows the powder feed channel to be relatively short, thus optimizing the overall response of the thin-stream powder pump.

[0126] Specifically, the following applies to the in FIG. 4 and FIG. 5 In the exemplary embodiment shown, the powder feed channel of the powder conveying injector can already be formed as part of a powder discharge or powder intake channel of a powder container, or can be directly connected to it fluidly. A pinch valve 40 is again provided in the powder feed channel, and a compressed air inlet device 30 is provided between the pinch valve 40 and the powder inlet 5 of the drive nozzle 1 of the powder conveying injector 100.

[0127] With regard to the advantages achievable with the pinch valve 40 and the compressed air inlet device 30, reference is made to the previous embodiments described in FIG. 1 Reference is made to the exemplary embodiment of the powder dispensing device 50 shown.

[0128] FIG. 6 Figure 1 schematically and in an isometric view shows an exemplary embodiment of the system according to the invention consisting of a plurality of powder dispensing devices 50 according to the second exemplary embodiment (see Figure 1). FIG. 4 ) and a powder reservoir. The powder reservoir is a powder container 90, in the chamber walls of which corresponding powder dispensing openings 91 are provided. It is provided that each of the powder dispensing openings 91 is or can be connected fluidically to the powder inlet 80 of the powder thin-stream pump 51 of the powder dispensing device 50, which is designed as a pump module, in order to be able to extract coating powder from the powder chamber of the powder container 90 in a powder coating plant and supply it to the corresponding spraying device.

[0129] Preferably, the powder discharge openings in the chamber walls of the powder container 90, which open into the powder chamber, have an elliptical shape, so that the effective area for drawing in (fluidized) coating powder is increased.

[0130] The powder dispensing openings are positioned as low as possible in the powder chamber to ensure that as much coating powder as possible can be extracted from the powder chamber by the powder dispensing devices 50. The powder dilution pumps 51 of the powder dispensing devices 50 are preferably located at a point higher than the highest powder level and are each connected to one of the powder dispensing openings leading into the powder chamber via a powder dispensing or powder intake channel. By positioning the powder dilution pumps 51 of the powder dispensing devices 50 higher than the maximum powder level, it is prevented that the coating powder rises from the powder chamber into the powder dilution pumps 51 when they are not switched on.

[0131] As in FIG. 6 As shown, the exemplary embodiment is a closed powder container 90 or one that can be closed with a lid, wherein the lid is preferably connectable to the powder container 90 via a quick-release connection.

[0132] Specifically, the powder container 90 is as follows: FIG. 6 It is provided that almost the entire upper cover wall of the powder container 90 can be removed in order to open the powder container 90.

[0133] The powder container 90 preferably has a substantially cuboid powder chamber for receiving coating powder. At least one cleaning compressed air inlet can be provided in a side wall of the powder container 90, to which a compressed air source can be connected via a compressed air line during a cleaning operation of the system for removing residual powder from the powder chamber in order to introduce cleaning compressed air into the powder chamber.

[0134] Furthermore, a residual powder outlet can be provided on the side wall of the powder container 90, which has an outlet opening through which residual powder can be driven out of the powder chamber during the cleaning operation of the system with the help of the cleaning compressed air introduced into the powder chamber.

[0135] Preferably, in the FIG. 6In the illustrated embodiment, a fluidizing device is provided for introducing fluidizing compressed air into the powder chamber of the powder container 90. The fluidizing compressed air can be introduced into the powder chamber through an end wall, longitudinal side wall, bottom wall, or top wall. Advantageously, however, the bottom wall of the powder chamber is designed as a fluidizing base. It can have a plurality of open pores or small through-holes through which fluidizing compressed air can flow upwards from a fluidizing compressed air chamber located below the bottom wall into the powder chamber. This fluidization brings the coating powder into a suspended state during powder coating operations, allowing it to be easily extracted by the powder dispensing devices 50. The fluidizing compressed air is supplied to the fluidizing compressed air chamber through a fluidizing compressed air inlet.

[0136] To ensure that the pressure within the powder chamber does not exceed a predetermined maximum pressure during operation of the fluidizing device, the powder chamber preferably has at least one fluidizing compressed air outlet with an outlet opening for discharging the fluidizing compressed air introduced into the powder chamber and for equalizing the pressure. In particular, the outlet opening of the at least one fluidizing compressed air outlet should be dimensioned such that, during operation of the fluidizing device, the maximum overpressure in the powder chamber relative to atmospheric pressure is 0.5 bar.

[0137] Furthermore, it is preferred that the powder container 90 has at least one level sensor to detect the maximum permissible powder level in the powder chamber. The level sensor can, for example, detect a maximum, a minimum, or any arbitrary powder level in the powder chamber.

[0138] It is also conceivable to provide an additional level sensor, which is arranged with respect to the powder container in such a way as to detect a minimum powder level and, as soon as this minimum powder level is reached or undershot, to send a corresponding message to a control unit and preferably to at least one control device 52 integrated in the corresponding powder dispensing devices 50, in order to preferably automatically supply fresh powder or recovery powder to the powder chamber via the inlet opening of at least one powder inlet.

[0139] The invention is not limited to the exemplary embodiments shown in the drawings, but is defined by the claims.

Claims

1. A powder dispensing device (50) with a dilute phase powder pump (51) for conveying powder, in particular coating powder, from a powder reservoir to a powder spraying device, wherein a control device (52) integrated into the powder dispensing device (50) is provided which is designed to set at least one parameter which is characterizing with respect to a spray coating process effected with the powder spraying device and / or with respect to powder conveyance effected with the dilute phase powder pump (51), wherein the control device (52) forms a structural unit with the dilute phase powder pump (51), wherein the control device (52) is designed as a control module and comprises a compressed air control (60) with an in particular central compressed air connection (64) via which compressed air can be supplied to the compressed air control (60) particularly from an external compressed air source, wherein the compressed air control (60) has at least one compressed air outlet (65 to 67) for providing the compressed air required by the dilute phase powder pump (51) for conveying powder / coating powder, and wherein the compressed air control (60) is designed to set the volume of compressed air provided via the at least one compressed air outlet (65 to 67) as required by the dilute phase powder pump (51) per unit of time for conveying powder / coating powder; wherein the compressed air control (60) comprises a first compressed air outlet (65) for providing conveying air required by the dilute phase powder pump (51) for conveying powder / coating powder and a second compressed air outlet (66) for providing supplementary air required by the dilute phase powder pump (51) for conveying powder / coating powder, wherein the compressed air control (60) is designed to set the volume of conveying air / supplementary air provided via the first and second compressed air outlet (65, 66) as required by the dilute phase powder pump (51) per unit of time for conveying powder / coating powder, wherein the dilute phase powder pump (51) is designed as a pump module and comprises a powder-conveying injector (100) having a drive nozzle (1) and a collecting nozzle (11), wherein the powder-conveying injector (100) comprises a first compressed air connection (7) via which conveying air can be supplied to the drive nozzle (1) and a second compressed air connection (27) via which supplementary air can be supplied to the powder-conveying injector (100), wherein the first compressed air connection (7) is fluidly connected to the first compressed air outlet (65) of the control device (52) realized as a control module and the second compressed air connection (27) is fluidly connected to the second compressed air outlet (66) of the control device (52) realized as a control module, wherein the dilute phase powder pump (51) realized as a pump module comprises a powder inlet (80) via which powder / coating powder can be supplied to the dilute phase powder pump (51) realized as a pump module, and wherein the dilute phase powder pump (51) realized as a pump module comprises at least one pinch valve (40) which is in particular able to be actuated by the control device (52) which is arranged in a flow path between the powder inlet (80) of the dilute phase powder pump (51) realized as a pump module and the powder inlet (5) of the drive nozzle (1) for interrupting a fluidic connection between the powder inlet (80) of the dilute phase powder pump (51) realized as a pump module and the powder inlet (5) of the drive nozzle (1) when needed, and wherein the dilute phase powder pump (51) realized as a pump module has a compressed air inlet device (30) via which compressed air can be supplied as needed to the at least one powder-conveying injector (100), and in particular the powder inlet (5) of the drive nozzle (1) of the powder-conveying injector (100), wherein the compressed air inlet device (30) is arranged in the flow path between the pinch valve (40) and the powder inlet (5) of the drive nozzle (1) of the powder-conveying injector (100).

2. The powder dispensing device (50) according to claim 1, wherein the control device (52) is designed to set at least one of the parameters listed below and characterizing a spray coating operation effected in respect of the powder spraying device: - an electrode spray current of one or more high-voltage electrodes of the powder spraying device; - a high voltage on one or more high-voltage electrodes of the powder spraying device; - a volume of electrode purge air to be supplied to the powder spraying device per unit of time; and - a volume of shaping air to be supplied to the powder spraying device per unit of time; and / or wherein the control device (52) is designed to set at least one of the parameters listed below and characterizing a powder conveyance effected in respect of the powder dispensing device (50): - an amount of powder / coating powder to be conveyed by the powder dispensing device (50) per unit of time; and - a volume of compressed conveying air to be conveyed together with the powder / coating powder per unit of time.

3. The powder dispensing device (50) according to claim 1 or 2, wherein the control device (52) comprises at least one manually actuatable parameter setting element (61) for setting a target parameter value for the at least one parameter which is characterizing with respect to a spray coating process effected with the powder spraying device and / or with respect to powder conveyance effected with the powder dispensing device (50), wherein the control device (52) comprises an optical display unit for displaying the at least one set target parameter value and / or for displaying a corresponding actual parameter value.

4. The powder dispensing device (50) according to one of claims 1 to 3, wherein the powder reservoir is provided with a fluidizing device, and wherein the control device (52) is further designed to set a volume of compressed fluidizing air to be supplied to the fluidizing device per unit of time, and wherein the control device (52) in particular comprises at least one manually actuatable setting element (61) for setting a target value for the volume of compressed fluidizing air to be supplied to the fluidizing device per unit of time.

5. The powder dispensing device (50) according to one of claims 1 to 4, wherein the control device (52) comprises an interface connection (62) for leading out a communication bus of the control device (52) designed to set the at least one parameter via remote control and / or to communicate the at least one set target parameter value to a remote processing unit, wherein the interface connection (62) preferably has a parallel or serial interface and / or wherein the communication bus is designed as a field bus system.

6. The powder dispensing device (50) according to one of claims 1 to 5, wherein the control device (52) is further designed to effect spray coating procedures, wherein the control device (52) comprises a memory device (63) having a plurality of spray coating programs to that end, wherein each spray coating program contains at least one respective adjustable parameter, wherein the control device (52) has at least one manually actuatable parameter setting element (61) for setting a target parameter value of the at least one adjustable parameter, and wherein the control device (52) in particular further comprises an optical display unit for automatically displaying the at least one set target parameter value.

7. The powder dispensing device (50) according to one of claims 1 to 6, wherein the compressed air control (60) has a third compressed air outlet (69) for providing the compressed air needed by a powder spraying device for spraying powder / coating powder, particularly electrode purge air, shaping air and / or compressed conveying air, wherein the compressed air control (60) is designed to set the volume of the compressed air provided via the third compressed air outlet (69) which the powder spraying device needs per unit of time for spraying powder / coating powder.

8. The powder dispensing device (50) according to claim 1 to 8, wherein the at least one compressed air outlet (65, 66, 69) is allocated a compressed air throttle device (59) having at least one throttle valve which is in particular able to be regulated by the control device (52), by means of which the volume of compressed air to be provided per unit of time via the at least one compressed air outlet (65, 66, 69) can be set.

9. The powder dispensing device (50) according to one of claims 1 to 8, wherein the first and second compressed air connection (7, 27) of the dilute phase powder pump (51) realized as a pump module are in each case directly connected fluidly to the respective first or second compressed air outlet (65, 66) of the control device (52) realized as a control module, and wherein the dilute phase powder pump (51) realized as a pump module is directly connected to the control device (52) realized as a control module; or wherein the first and second compressed air connection (7, 27) of the dilute phase powder pump (51) realized as a pump module are in each case fluidly connected to the respective first or second compressed air outlet (65, 66) of the control device (52) realized as a control module via a channel (55, 56) formed in a distributor block (53), and wherein the dilute phase powder pump (51) realized as a pump module is connected to the control device (52) realized as a control module via the distributor block (53), wherein the distributor block (53) has a compressed air outlet (70) which is fluidly connected to the third compressed air outlet (69) of the control device (52) realized as a control module via a channel (57) formed in the distributor block (53).

10. The powder dispensing device (50) according to one of claims 1 to 9, wherein the pinch valve (40) can be pneumatically actuated by means of compressed air provided by the compressed air control (60).

11. The powder dispensing device (50) according to one of claims 1 to 10, wherein the collecting nozzle (11) of the at least one powder-conveying injector (100) comprises a stream collecting channel (12) distanced axially opposite the drive nozzle (1) of the at least one powder-conveying injector (100), wherein the drive nozzle (1) of the at least one powder-conveying injector (100) has a powder inlet (5) distanced axially opposite from the stream collecting channel (12) of the at least one powder-conveying injector (100), wherein the powder inlet (5) of the drive nozzle (1) is distanced axially opposite from the stream collecting channel (12) and is preferably aligned with respect to an axis which coincides with a longitudinal axis (L) defined by the stream collecting channel (12) or runs parallel to a longitudinal axis (L) defined by the stream collecting channel (12).

12. The powder dispensing device (50) according to one of claims 1 to 11, wherein the width of the powder dispensing device (50) is in a range between 20 mm and 150 mm and preferably between 30 mm and 100 mm.

13. A system having a powder dispensing device (50) according to one of claims 1 to 12 and a powder reservoir, wherein the powder dispensing device (50) is arranged directly on the powder reservoir and a powder inlet (80) of the powder dispensing device (50) opens into a powder chamber of the powder reservoir via an intake line.

14. The system according to claim 13, wherein the powder reservoir comprises at least one powder container having a powder chamber for powder / coating powder, wherein a powder dispensing channel is formed in a side wall of the powder container, and wherein the powder inlet (80) of the powder dispensing device (50) is fluidly connected or connectable to the powder dispensing channel via an intake hose connection.