Integrated air injection device body, module and system

Abstract

The invention relates to a one-piece air injection device body (2), comprising: a pressure chamber (3), which encloses a piston guide (20) for receiving a piston (22) and a valve seat (15) for the piston (22); an interface (10) for a control unit (30) for controlling the position of the piston (22); and an air outlet (14). It is provided that the air injection device body (2) further comprises at least two further connections (12) for further air injection devices (4). The invention further relates to an air injection device (4) having such an air injection device body (2) and to an air delivery and / or cleaning module (6).

Description

Technical Field

[0001] The present invention relates to an air jet device body with an integral structure as described in the preamble of claim 1, as well as a module and a system. Background Technology

[0002] The main body of the air jet device is used in the air jet device, which is constructed to generate strong air jets and is particularly suitable for the following applications: removing material clumps from the surface of the process space, or conveying materials within the process space.

[0003] The air jet device is based on the principle that a medium, such as air or inert gas, stored in a pressurized space is suddenly ejected through a blow-out port. During this process, compressed air is suddenly injected under forced control by a valve unit, causing the compressed air to be abruptly blown from the air jet device towards the outlet point, typically formed by the blow-out nozzle, from which the compressed air enters the process space. It is preferable to blow the ejected air jet into the interface between the wall of the process space and the agglomerates, as adhesion is minimal there.

[0004] Air injection devices are commonly used in process spaces with high operating temperatures, such as up to 1200°C, and often contain corrosive chemical atmospheres. In this invention, such process spaces are also referred to as combustion chambers. The blow-out nozzles are made of high-temperature resistant cast materials (thermally fired nozzles). Installing the blow-out nozzles in existing wall openings is readily feasible, and they can also be subsequently installed externally via a corresponding core drilling process. In equipment with particularly high heat generation, long blow-out nozzles can be provided to protect valve units, especially the piston assembly of the air injection device, from high temperatures.

[0005] An air jetting device is known from EP 1 528 013 A1, which has a built-in, upper-mounted valve unit. The device includes a pressure vessel for storing a pressurized gaseous medium, and a valve unit with a cylinder and a piston movable within the cylinder for the sudden ejection of the stored medium. The valve unit is essentially arranged inside the pressure vessel. Such air jetting devices are costly to manufacture and limit structural variability and maintainability because the valve unit and ejection pipe are typically difficult to access within the pressure vessel. Furthermore, the use of large-volume pressure vessels in air delivery and / or cleaning systems is disadvantageous.

[0006] An integrally constructed air injection device body according to the preamble of claim 1 is known from EP 2 272 776 A1. The air injection device body includes a pressure chamber surrounding a piston guide for receiving a piston and a valve seat for the piston. The body has a connection flange for a control unit for venting the piston front chamber and thereby discharging compressed air through an air outlet flange. Summary of the Invention

[0007] The objective of this invention is to provide an air jetting device body, an air jetting device, an air delivery and / or cleaning module, and an air delivery and / or cleaning system for process spaces, which can be manufactured at low cost, particularly without welding operations. The module and system should have low complexity and be adaptable to process spaces of different sizes. A further objective of this invention is to provide a system that is particularly easy to maintain.

[0008] This task is accomplished by an integrally constructed air injection device body having a pressure chamber, an interface for a control unit, an air outlet, and at least two additional interfaces for other air injection devices, wherein the pressure chamber surrounds a piston guide for accommodating a piston and a valve seat for the piston, and the control unit is used to control the position of the piston.

[0009] The task is also addressed by an air jetting device, an air delivery and / or cleaning module for a process space, and an air delivery and / or cleaning system, which include at least one of the said air jetting device bodies.

[0010] The air injection unit body is constructed in a very compact manner by combining the piston valve assembly required for the operation of the air injection unit with the interface for additional air injection units used to expand the system, thereby reducing the system size. Through its distribution function, this air injection unit body can be advantageously applied in adaptive air delivery and / or cleaning systems for various process spaces, particularly in combustion chambers. By reducing individual components and integrating multiple functions into a single unit, system maintenance is significantly improved.

[0011] The air jet device body according to the invention is integrally manufactured by casting. This eliminates the need for welding, which would be cumbersome due to the need for a compact body and the limited accessibility of the weld points. A disadvantage of welding is that some welds must be inspected by X-rays to ensure their quality, which incurs additional costs.

[0012] For example, the air-containing volume of the pressure chamber is 2 to 20 liters, preferably 5 to 15 liters, and particularly preferably 8 to 10 liters.

[0013] A valve seat located within the air injection device body defines a stop surface for the piston. In one embodiment, this stop surface may be formed by a built-in stop flange constructed on the air injection device body itself. Alternatively, the stop surface may be formed by additional components, such as a tightening ring, a press-fit ring, or a cast ring. The air outlet is closed by the piston abutting against the valve seat.

[0014] Particularly advantageous when applied to stepped process spaces is the air jetting device body having exactly two interfaces for two additional air jetting devices, the two interfaces preferably arranged opposite each other in an aligned manner. This allows for linear directional expansion of the system, specifically achieved via connectors, which can be constructed, for example, as rigid pipe structures or bellows. This air jetting device body is particularly suitable for modules configured to position multiple air jetting devices along a step of the process space.

[0015] The air exhaust outlet and the interface for the control unit are preferably arranged opposite each other in an aligned manner.

[0016] According to an advantageous embodiment, a first axis connecting the air outlet and the interface for the control unit intersects with a second axis connecting two interfaces for two additional air injection devices. The intersecting arms are preferably connected to each other at a 90° angle.

[0017] The symmetrical arrangement of the interfaces offers several advantages. Firstly, the system is equally accessible from all directions, facilitating maintenance and component replacement. Secondly, the air jet device body is easy to calculate and model, allowing for optimization of the specific internal dimensions of the flow channels, the location of blind holes, burrs, and edges during the casting process. One optimization objective can be to generate as few turbulences as possible during air jetting to maintain low energy loss.

[0018] The connection of components to be connected, such as cover plates, pipes, pipe flanges, blind flanges, etc., to the interface and air outlet can be achieved with or without additional fastening tools through form fit and / or force fit methods, such as threaded connections, clamping, external and / or internal threads, locking, heat shrinking, etc. For details, please refer to professional knowledge. The interface of the air injection device body can be constructed in various ways accordingly. The interface is preferably constructed as a connecting flange.

[0019] Although the invention is described in conjunction with threaded connections, i.e., screws as fastening tools, it is not limited thereto. The connection of components can be in any manner; however, detachable connections are preferred, particularly threaded connections, pin connections, or threaded connections where the components to be connected are directly screwed onto a corresponding interface, such as a connecting flange. Threaded connections are more preferred due to their ease of operation and maintenance.

[0020] A particular advantage is that the interface and / or air vent are constructed as an integral flange, partly because it forms a particularly compact structural form, and partly because fastening tools for connecting other components are accessible from the outside. The integral flange has fastening tool receptacles, preferably four to eight, particularly four. For ease of maintenance, the fastening tool receptacles are preferably constructed as screw receptacles with corresponding internal threads. Blind holes on the integral flange can be used as screw receptacles.

[0021] As an alternative to the integral flange implementation, the interface can be constructed as a pipe flange to provide a fastening tool housing.

[0022] Preferably, the pressure chamber is configured such that the minimum flow cross-section for outputting compressed air is formed by the inner diameter of the valve seat.

[0023] According to an advantageous embodiment, the diameter of the interface for the control unit is similar to, and preferably the same as, the diameter of the interface for the other air injection device. Furthermore, it is preferably specified that the diameter of the interface for the other air injection device is similar to, and preferably the same as, the diameter of the air outlet. Alternatively or supplementarily, the diameter of the interface for the control unit is similar to, and preferably the same as, the diameter of the air outlet.

[0024] "Similar size" means a deviation of no more than 20%, preferably no more than 10%, and more preferably no more than 5%. The uniformity of interface dimensions allows for the use of standardized components, such as valve covers, pipe flanges, or blind flanges. In this sense, it is further advantageous that the interface for the control unit or the interface for another air injection device have the same number of tooling holes, although the number of tooling holes may differ between the interface for the control unit and the interface for another air injection device due to potentially different nominal pressures in the pressure chamber and the piston front chamber.

[0025] The invention also includes an air injection device having an air injection device body as described above, a piston placed in a piston guide device, and a connected control unit. The invention further includes an air injection device having an air injection device body as described above, and any blind flange connected to an interface, a connected filling hose, or an external pressure vessel.

[0026] According to another aspect of the invention, an air delivery and / or cleaning module for a particularly stepped process space is provided, the module comprising a plurality of air jet devices having the air jet device bodies described above. The module preferably comprises 2 to 8, more preferably 3 to 5, and particularly, for example, 4 of the aforementioned air jet devices. The module also includes a plurality of connectors, wherein the air jet devices are arranged in a row by means of the connectors and coupled to each other in forming a common pressure space, so as to provide their air outlets directly or indirectly at preferably uniform intervals for connection to the process space.

[0027] Typically, the volume of the pressure space consists of the volume of the connector and the volume of the pressure chamber of the air injection device.

[0028] If necessary, to increase the volume of the pressure space, the module can be directly connected to a pressure vessel that can be filled with external compressed air, for example by means of a flange or indirectly by means of a connector, through the interface of the air injection device for another air injection device.

[0029] Connection to the process space can be made directly or indirectly through an extension, such as a blow-out nozzle or a blow-out tube, which may have a blow-out nozzle, such as a heat-burning nozzle, inserted therein.

[0030] The term "stepped process space," as it is known, refers to a process space having at least stepped walls. For example, some applications include combustion chambers where material fed into the process space resides on each step for a defined time, during which time it is processed, for example, through combustion. In a stepped process space, multiple air jet devices are used on each step. After the defined residence time, the material is either removed in a stepped manner, for example, by air jets generated by the air jet devices, or conveyed forward step by step. Furthermore, the module's air jet devices are also designed to, for example, remove material agglomerates on the steps of the process space.

[0031] The module is preferably installed horizontally in the wall of the "step surface" area of ​​the step, so that the air outlet can be aligned with the "step surface" of the step, which constitutes the material holding surface. However, the invention is not limited to the specific geometry of the process space steps. The connection between the blow-out nozzle or blow-out pipe and the process space can also be made at a certain installation angle, such as 0°, 20°, 40°, 75° and 90°, where the installation angle refers to the angle formed by the tip of the blow-out pipe or heated nozzle with the outlet relative to the longitudinal axis of the opening in the wall into which it is embedded.

[0032] This invention is not limited to a specific number of air injection devices in the module. Rather, depending on the size of the system, the system can be expanded in principle due to the compact form of the air injection device body, and its framework conditions are determined in particular by the total volume of the common pressure space and its refill time.

[0033] This module may specify that at least one of the air injection devices has a blind plate at its interface for another air injection device. This air injection device constitutes a terminal or end-user device within the relevant module.

[0034] According to one embodiment, the blind flange can be coupled or has been coupled to the torque support. Because the air injection device operates with a jet-type air output, during operation, the end air injection device may generate torque on the piston-valve axis, which can be counteracted by the torque support.

[0035] In one embodiment of the present invention, the main body of the air injection device of the system is the same.

[0036] Preferably, the connector is constructed as a compensator, particularly preferably a bellows-shaped compensator, to compensate for tolerances and varying thermal expansion of the air injection device's interface or the piping connected to the process space, especially the combustion chamber. Alternatively, the connector may also be a rigid piping structure.

[0037] Preferably, at least one of the air injection devices is coupled to an external compressed air source at its interface for another air injection device. In this system, coupling to the external compressed air source can be achieved through one or two air injection devices.

[0038] Ideally, filling should be performed using only a single filling hose, which simplifies system maintenance. With optimized interface and piston chamber dimensions, filling operations can be performed easily and efficiently. For example, a 3 / 4-inch filling hose can be used, inserted into a bore in the blind flange.

[0039] Preferably, the air injection devices are individually connected to the control unit via their interfaces, and the control units are preferably connected to each other via connecting hoses. Suitable hoses are, for example, 1 / 2-inch hoses. The piston front chamber is filled via the control unit.

[0040] The present invention also includes an air delivery and / or cleaning system having a plurality of the above-described air delivery and / or cleaning modules, wherein at least one air delivery and / or cleaning module is respectively assigned to one step of a stepped process space.

[0041] Alternatively, the modules may be arranged across multiple steps, but this would increase the workload, especially since it requires tilted connections to the air jets, and may even require tilted extensions of the axis of the interface in the air jet body for other air jets.

[0042] Although the invention is described in connection with "air" injection, it is not limited thereto. Depending on the application, other gases, particularly inert gases, may be used in addition to ambient air.

[0043] Although the invention is described in conjunction with a 3 / 2-way valve, it is not limited thereto. Other mechanisms may also be used, as long as they enable the piston to move suddenly from the valve seat to the open position and return from the open position to the closed position. In particular, a 2 / 2-way valve or a quick-release valve, as well as a spring in the piston's front chamber, may be used. Attached Figure Description

[0044] The present invention will now be described in detail with reference to the accompanying drawings.

[0045] In the attached image:

[0046] Figure 1 A perspective schematic diagram of an air injection device according to an embodiment of the present invention is shown.

[0047] Figure 2 A cross-sectional view of an air injection device according to an embodiment of the present invention is shown.

[0048] Figure 3 A schematic diagram of an air delivery and / or cleaning system for a stepped process space according to an embodiment of the present invention is shown.

[0049] Figure 4 This diagram shows the interface area where two air delivery and / or cleaning modules are interconnected.

[0050] Figure 5 A schematic diagram of the interface area connecting the air delivery and / or cleaning module to the stepped process space is shown. Detailed Implementation

[0051] Figure 1 An air injection device 4 is shown, which has an integrally constructed air injection device body 2 according to one embodiment of the present invention. The air injection device body 2 includes a pressure chamber 3, whose air-containing volume is, for example, about 10 liters (see...). Figure 2 ).

[0052] The air jet device 4 is suitable for use in air delivery and / or cleaning modules 6 and air delivery and / or cleaning systems 8, such as... Figure 3 As shown.

[0053] The air injection device body 2 includes an interface 10 for a control unit 30 and an air outlet 14, the air outlet 14 being arranged opposite to the interface 10 for the control unit 30. The interface 10 for the control unit 30 is, by way of example but preferably, constructed as a cylindrical integral flange, as is the air outlet 14. The air injection device body 2 also includes two interfaces 12 for additional air injection devices 4, which are also, by way of example but preferably, constructed as integral flanges.

[0054] The control unit 30 includes a cover 32 having a central hole serving as a front chamber air delivery channel 31 (see...). Figure 2 The cover 32 is secured to the interface 10 for the control unit 30 by means of four exemplary but non-limiting fastening screws 36, which are embedded in corresponding blind holes (not shown). In the illustrated embodiment, the control unit includes, but is not limited to, a 3 / 2-way valve assembly 34.

[0055] On the end side of the interface 12 for the additional air injection device 4, four receptacles 38 are preferably provided, but not limited to each, which may be equipped with internal threads to accommodate screws.

[0056] Figure 2 A cross-sectional view of the air injection device body 2 is shown, which includes a piston assembly and a portion of the connected control unit 30.

[0057] Piston 22 is in the closed position and can move up and down within the tubular piston guide device 20 shown in the figure. The piston guide device 20 is formed of a short tube that extends into the pressure chamber 3 of the air injection device body 2. As shown, a section of tube that directly contacts piston 22 can be inserted into the piston guide device 20. This is not part of the present invention and therefore will not be described in detail.

[0058] In an embodiment not shown that also pertains to the present invention, the cover 32 and / or the piston guide 20 may have overflow holes that enable pressure conduction from the piston front chamber to the pressure chamber 3, thus eliminating the need for an additional filling interface for the pressure chamber 3. Figure 5 (See attached figures 40 / 46).

[0059] Approximately at the height of the second axis B, but this is not limiting of the invention, the piston guide device 20 terminates at a position sufficiently far from the valve seat 15 of the piston 22 so as to form a connecting channel 16 between the interface 12 for the additional air injection device 4 and the air outlet 14 when the valve is open, i.e. when the piston 22 is in the open position, thereby conducting compressed air injection.

[0060] In the illustrated embodiment, which is not intended to limit the invention, the piston 22 is composed of an intermediate disk 26 and a piston disk 27 connected thereto, which together with the two heat-resistant disks 28 exemplified herein are connected to form a clamping assembly by connecting screws 21.

[0061] A piston front chamber 24 is formed between the piston 22 and the cover 32 of the control unit 30. The piston front chamber 24 is connected to the control unit 30 via a delivery channel 31. Figure 1 The 3 / 2-way valve assembly 34 is shown.

[0062] A first axis A connects the interface 10 for the control unit 30 to the air outlet 14. A second axis B extends perpendicularly to the first axis A, connecting the two interfaces 12 for the additional air injection devices 4. The first axis A and the second axis B here exemplarily, but preferably, form a right-angle intersection.

[0063] D4 represents the inner diameter of valve seat 15. In pressure chamber 3, the inner diameter D4 of valve seat 15 forms the minimum flow cross-section for outputting compressed air. In particular, the cross-sectional area of ​​valve seat 15 is smaller than the cross-sectional area of ​​the connecting channel 16 region.

[0064] The interfaces 12 for the additional air injection device 4 have the same diameter D2. The interfaces 12 for the additional air injection device 4 are arranged opposite each other in an aligned manner. A receiving portion 38, as described above, is provided on the end face for connection to the additional air injection device 4 via a connector 44, which will combine... Figure 3 Detailed explanation.

[0065] In the illustrated embodiment, the diameter D3 of the air outlet 14 is advantageously, but not limitingly, the same as the diameter D1 of the interface 10 for the control unit 30, and the same as the diameter D2 of the interface 12 for the additional air injection device 4.

[0066] The air jet device 4 is based on the principle that the medium stored in the pressure chamber 3, the connector 44, and possibly in the pressure vessel, especially air or inert gas, is suddenly ejected through the air outlet 14.

[0067] The main body 2 of the air injection device is first filled with compressed air through an external compressed air interface, which will be combined with Figure 5 Further explanation: The piston front chamber 24 is also filled with front chamber air.

[0068] The air pressure in the piston's front chamber 24 forces the piston 22 against the valve seat 15 located at the air outlet 14. This closes the air outlet 14. Figure 2 As shown.

[0069] The injection process is controlled by the 3 / 2-way valve assembly 34. When the 3 / 2-way valve assembly 34 is in the correct position, the air outlet 14 is closed by the piston 22 abutting against the valve seat 15; when in the other position, the piston front chamber 24 is vented, i.e., the air outlet 14 is opened. This triggers the piston 22 to move suddenly backward and strike the damping ring 25, thereby generating air injection by releasing the pressure in the pressure chamber 3.

[0070] When the 3 / 2-way valve assembly 34 is triggered, the piston front chamber 24 is vented. Consequently, the medium stored in the pressure chamber 3 and the connector 44 acts on the piston, pushing the piston 22 towards the cover 32. Thus, compressed air is suddenly discharged from inside the air injection device body 2 through the air outlet 14.

[0071] After the air injection is released, the air injection device body 2 is refilled with compressed air through the external compressed air interface. The piston front chamber 24 is also refilled with air. The air injection device 4 is now ready again.

[0072] Figure 3 An air delivery and / or cleaning system 8 is shown, wherein five air delivery and / or cleaning modules 6 according to one embodiment of the invention are shown in full, purely by way of example. Hereinafter, the air delivery and / or cleaning module 6 will be simply referred to as "module 6", and the air delivery and / or cleaning system 8 will be simply referred to as "system 8".

[0073] The system 8 is arranged on the wall 50 of a stepped process space. The process space includes multiple steps 52, each step containing a dwell surface 54 and a step surface 56 for the material to be processed. Here, for example, but not limited to, the step surfaces 56 are arranged in a stepped manner at an angle of 90° to each other. The dimensions of the dwell surface 54, the dimensions of the step surfaces 56, and the number thereof are appropriately determined according to the required application type.

[0074] although Figure 3 The system fully illustrates five modules 6, but it is not limited to these and can be expanded arbitrarily in principle.

[0075] exist Figure 3 In the illustrated embodiment, module 6 includes four air jet devices 4, which are coupled to each other via connectors 44. The pressure chambers 3 of the air jet devices 4 and the volume of the connectors 44 together form a common pressure space. The connectors 44 are exemplarily secured by screws to corresponding interfaces 12 for other air jet devices 4.

[0076] In the illustrated embodiment, connector 44 is constructed as a bellows compensator, for example, made of metal. Alternatively, a rigid pipe structure, not shown, may also be used.

[0077] Module 6 is fixed to the wall 50 of the stepped process space by torque support 48 on one hand, and supported on another module 6 arranged next to it by another torque support 48, which is arranged on the same step 52.

[0078] To transport materials to be processed within the stepped process space, it is preferable to individually control the air jet device 4 to output compressed air. For example, if the entire stepped structure 52 is operated, materials located on that step will be blown to the next step. The control method is not the focus of this invention and depends on the required application conditions.

[0079] Figure 4 The connection area of ​​the two modules 6 is shown, with the end air injection device 4 of each module 6 depicted here. Each end module 6 is provided with a blind flange 40. Due to the torque effect during air injection, the end air injection device 4 generates a lateral impact force, which is counteracted by a torque support 48. For this purpose, the blind flange 40 is secured, exemplarily but not limitingly, by a long nut 49 with a threaded rod to press the end air injection device 4 tightly against the torque support 48.

[0080] also, Figure 4 A connecting hose 47 for the front chamber air is also shown, which connects the control unit 30 of the air injection device 4 to the control unit 30 of another air injection device 4. The connecting hose 47 is designed according to the required pressure and sealing requirements, for example, a 1 / 2-inch hose.

[0081] Figure 5 The diagram shows a terminal air injection device 4 equipped with a connecting hose 46, such as a 3 / 4-inch hose, for connecting to an external pressure source. For this purpose, the air injection device 4 has a blind flange 40 fixed to the interface 12, which has a through-hole for connecting the connecting hose 46. The blind flange itself is secured to the interface 12 for another air injection device 4 by screws. A torque support 48 is also fixed to the blind flange 40 for connecting the module 6 to the wall 50 of the stepped process space.

[0082] As an alternative not shown, a direct connection, such as a flange connection, can be provided instead of the blind flange 40, or an indirect connection can be provided between the module 6 and a pressure vessel that can be filled with external compressed air via the connector 44.

[0083] Figure 5 A blow-out pipe 42 is also shown, with one end connected to an air outlet 14 and the other end connected to a resting surface 54 of a step 52 in the process space. Although the figure shows a vertical connection between the blow-out pipe 42 and the step 52, an angled connection can also be used.

[0084] List of reference numerals

[0085] 2. Air injection device body; 3. Pressure chamber; 4. Air injection device; 6. Module; 8. System; 10. Interface for control unit; 12. Interface for other air injection devices; 14. Air outlet; 15. Valve seat; 16. Connection channel; 20. Piston guide device; 21. Connecting screw; 22. Piston; 24. Piston front chamber; 25. Damping ring; 26. Intermediate plate; 27. Piston disc; 28. Heat shield plate; 30. Control unit; 31. Front chamber air delivery channel; 32. Cover; 34. 3 / 2-way valve assembly; 36. Fastening screw; 38. Receiving part; 40. Blind flange; 42. Blowout pipe; 44. Connector; 46. External pressure source connection hose; 47. Front chamber air connection hose; 48. Torque support; 49. Long nut; 50. Wall surface; 52. Step; 54. Dwelling surface; 56. Step surface;

[0086] A. First axis; B. Second axis; D1. Diameter of the control unit interface; D2. Diameter of the interface of the other air injection device; D3. Diameter of the air outlet; D4. Inner diameter of the valve seat.

Claims

1. A one-piece air injection device body (2) comprising: a pressure chamber (3) surrounding a piston guide (20) for accommodating a piston (22) and a valve seat (15) for the piston (22); an interface (10) for a control unit (30) for controlling the position of the piston (22); and an air outlet (14), characterized in that, The air jet device body (2) also includes at least two additional interfaces (12) for another air jet device (4).

2. The main body (2) of the air injection device according to claim 1, characterized in that, The air jet device body (2) has exactly two interfaces (12) for two other air jet devices (4), the two interfaces being preferably arranged opposite each other in an aligned manner.

3. The air injection device body (2) according to any one of the preceding claims, characterized in that, The first axis (A) connecting the air outlet (14) and the interface (10) for the control unit (30) forms a preferred right angle with the second axis (B) connecting the two interfaces (12) for the two additional air injection devices (4).

4. The air injection device body (2) according to any one of the preceding claims, characterized in that, The interface (10) for the control unit (30), the interface (12) for the additional air injection device (4), and / or the air outlet (14) are constructed as integral flanges.

5. The air injection device body (2) according to any one of the preceding claims, characterized in that, In the pressure chamber (3), the minimum flow cross section for outputting compressed air is formed by the inner diameter (D4) of the valve seat (15).

6. The air injection device body (2) according to any one of the preceding claims, characterized in that, The diameter (D1) of the interface (10) for the control unit (30) is similar in size to, preferably the same in size to, the diameter (D2) of the interface (12) for the other air injection device (4) and / or the diameter (D3) of the air outlet (14).

7. An air injection device (4) having an air injection device body (2) according to any one of the preceding claims, a piston (22) placed in the piston guide device (20), and a connected control unit (30).

8. An air delivery and / or cleaning module (6) for a process space, particularly a stepped one, comprising a plurality of air jet devices (4) according to claim 7, preferably 2 to 8, more preferably 3 to 5, and particularly preferably 4 of the air jet devices (4), characterized in that, The air jet devices (4) are arranged in a row by means of connectors (44) and coupled to each other in the presence of a common pressure space, so as to provide their air outlets (14) directly or indirectly at a preferably uniform spacing for connection to the process space.

9. The air delivery and / or cleaning module (6) according to claim 8, characterized in that, At least one of the air injection devices (4) is provided with a blind flange (40) at its interface (12) for another air injection device (4), the blind flange preferably being coupled to a torque support (48).

10. The air delivery and / or cleaning module (6) according to any one of claims 8 or 9, characterized in that, The air injection device body (2) of the system has the same structure.

11. The air delivery and / or cleaning module (6) according to any one of claims 8 to 10, characterized in that, The connector (44) is constructed as a compensator, particularly a compensator in the form of a bellows.

12. The air delivery and / or cleaning module (6) according to any one of claims 8 to 11, characterized in that, At least one of the air injection devices (4) is coupled to an external compressed air source at its interface (12) for another air injection device (4).

13. The air delivery and / or cleaning module (6) according to any one of claims 8 to 12, characterized in that, The air injection devices (4) are preferably connected individually to the control units (30) via their interfaces, wherein the control units (30) are preferably connected to each other via connecting hoses (47).

14. An air delivery and / or cleaning system (8) having a plurality of air delivery and / or cleaning modules (6) according to any one of claims 8 to 13, characterized in that, At least one air delivery and / or cleaning module (6) is correspondingly assigned to one step (52) of the stepped process space.

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