One-piece air blast device body, module and system

Abstract

An integrally formed air blast device body (2) having a pressure chamber (3) which surrounds a piston guide (20) for receiving a piston (22) and a valve seat (15) for the piston (22), a connection (10) for a control unit (30) for controlling the position of the piston (22) and an air outlet opening (14), characterized in that the air blast device body (2) also comprises at least two further connections (12) for further air blast devices (4).

Description

[0001] The invention relates to a one-piece air blast device body according to the preamble of claim 1, as well as a module and a system. STATE OF THE ART

[0002] Air blast device bodies are used in air blast devices designed to generate strong air blasts, particularly in applications to remove material build-up from the surfaces of a process chamber or to convey material in a process chamber.

[0003] Air blast devices are based on the principle that a medium stored in a pressurized chamber, such as air or an inert gas, is suddenly discharged through an exhaust opening. A valve unit is used to force-activate a sudden blast of compressed air, so that compressed air is suddenly blown from the air blast device to an exhaust point, generally formed by an exhaust nozzle, from where the compressed air then enters the process chamber. The escaping air jet is preferably blown into the interface between a wall of the process chamber and the deposited material, as this is where the lowest adhesive forces are present.

[0004] Air blast devices are frequently used in process spaces with high operating temperatures, e.g., up to 1200°C, where an aggressive chemical atmosphere usually also prevails inside the process spaces. Such process spaces are also referred to as combustion chambers in the context of the present invention. The exhaust nozzle is made of a heat-resistant cast material (hot-fire nozzle). The installation of an exhaust nozzle in existing wall cutouts is possible at any time and can, in particular, also be carried out retrospectively from the outside using an appropriate core drilling process. For systems with particularly high heat generation, long exhaust nozzles can be provided to protect the valve unit, in particular the piston assembly of the air blast device, from the effects of heat.

[0005] EP 1 528 013 A1 discloses an air blast device with an internal, top-mounted valve unit, a pressure vessel for storing a gaseous medium under pressure, and a valve unit with a cylinder and a piston movable therein for abruptly blowing out a stored medium. The valve unit is essentially located within the pressure vessel. Such air blast devices are complex to manufacture and limit design variability and maintainability, since the valve unit and the blow-out pipe in the pressure vessel are generally difficult to access. Furthermore, the use of a large-volume pressure vessel is disadvantageous when used in an air conveying and / or cleaning system.

[0006] EP 2 272 776 A1 discloses a one-piece air blast device body according to the preamble of claim 1. The air blast device body comprises a pressure chamber surrounding a piston guide for receiving a piston and a valve seat for the piston. The body has a connecting flange for a control unit, which serves to vent a piston pre-chamber and thus to discharge the compressed air via an air outlet flange. OBJECT OF THE INVENTION

[0007] The invention is based on the object of proposing an air blast device body, an air blast device, an air conveying and / or cleaning module, and an air conveying and / or cleaning system for process chambers that can be manufactured cost-effectively, in particular while avoiding welding. The module and the system should be of low complexity and adaptable to different sizes of process chambers. A further object of the invention is to provide a particularly maintenance-friendly system. DISCLOSURE OF THE INVENTION

[0008] The problem is solved by a one-piece air blast device body with a pressure chamber surrounding a piston guide for receiving a piston and a valve seat for the piston, a connection for a control unit for controlling the position of the piston, an air outlet opening and at least two further connections for further air blast devices.

[0009] The object is also achieved by an air blast device, an air conveying and / or cleaning module and an air conveying and / or cleaning system for process spaces, which comprise at least one such air blast device body.

[0010] The air blast unit body is designed to be very compact, combining the piston-valve assembly required for operation with connections for additional air blast units to expand the system. This reduces the system's volume. Thanks to its distribution functionality, the air blast unit body can be advantageously used in an adaptive air conveying and / or cleaning system for a variety of process spaces, particularly in combustion chambers. The reduction in individual parts and the integration of multiple functionalities into a single component significantly improve system maintenance.

[0011] The air blast device body according to the invention is manufactured in one piece using a casting process. This eliminates the need for welding, which is time-consuming due to the required compactness of the body and the limited accessibility of the welds. A disadvantage of welding is that the welds sometimes have to be X-rayed to ensure their quality, which results in additional costs.

[0012] The pressure chamber has, for example, an air intake volume of 2 to 20 l, preferably of 5 to 15 l, particularly preferably of 8 to 10 l.

[0013] The valve seat provided in the air blast device body defines a stop surface for the piston. In one embodiment, the stop surface can be formed by an internal stop flange formed on the air blast device body itself. Alternatively, the stop surface can be formed by an additional component, such as a screw-in ring, press-in ring, or cast-in ring. The piston's contact with the valve seat closes the air outlet opening.

[0014] Particularly advantageous for use in stepped process chambers is when the air blast device body has exactly two connections for two additional air blast devices, which are preferably arranged in alignment opposite each other. This allows the system to be linearly expanded in one direction using connectors, which can be designed, for example, as rigid tubular structures or corrugated hoses. The air blast device body is particularly suitable for use in a module designed to position multiple air blast devices along a step of the process chamber.

[0015] The air outlet opening and the connection for the control unit are preferably arranged in alignment opposite each other.

[0016] According to an advantageous embodiment, a first axis, which connects the air outlet opening and the connection for the control unit, and a second axis, which connects the two connections for the two additional air blast devices, form a cross. The arms of the cross are preferably connected to each other at an angle of 90°.

[0017] The symmetrical arrangement of the connections offers several advantages. Firstly, the system is equally easily accessible from all sides, which provides advantages for maintenance and part replacement. Secondly, the air blast device body is easy to calculate and model, allowing the specific internal dimensions of the flow channels, the position of blind holes, burrs, edges, and the like to be optimized for foundry purposes. One goal of optimization can be to generate as little turbulence as possible during the air blast to minimize energy losses.

[0018] The connection of components to be connected, such as covers, pipes, pipe flanges, blind flanges, etc., to the connections and the air outlet opening can be made positively and / or non-positively, by means of screwing, bracing, external and / or internal threads, clamping, shrinking, or similar, with or without additional fastening devices, in which case reference may be made to the specialist knowledge. The connections of the air blast device body can be designed accordingly in a variety of ways. They are preferably designed as connecting flanges.

[0019] Although the invention is described in connection with screw connections, i.e., screws as fastening means, it is not limited to this. The components can be connected in any way, but detachable connections are preferred, in particular screw connections, pin connections, or even a threaded connection, i.e., a direct screw connection of the component to be connected to the respective connection, e.g., a connecting flange. Screw connections are preferred due to their accessibility and ease of maintenance.

[0020] It has proven particularly advantageous if the connections and / or the air outlet opening are designed as block flanges, since this, on the one hand, provides a particularly compact design for the body and, on the other hand, the fastening elements used to connect the other components are accessible from the outside. The block flanges are provided with receptacles for fastening elements, preferably with four to eight, particularly preferably four, receptacles for fastening elements. Preferably, because of their ease of maintenance, the receptacles for fastening elements are designed as screw receptacles and have a corresponding internal thread. Blind holes can be provided in the block flanges as screw receptacles.

[0021] As an alternative to the embodiment as a block flange, it can be provided that the connections are designed as pipe flanges to provide the receptacles for fastening means.

[0022] In the pressure chamber, it is preferably provided that a smallest flow cross-section for the discharge of the compressed air is formed by the inner diameter of the valve seat.

[0023] According to an advantageous embodiment, the diameter of the connection for the control unit is similar in size, preferably the same in size, to the diameter of the connection for the additional air blast device. Furthermore, the diameter of the connection for the additional air blast device is preferably similar in size, preferably the same in size, to the diameter of the air outlet opening. Alternatively or additionally, the diameter of the connection for the control unit is similar in size, preferably the same in size, to the diameter of the air outlet opening.

[0024] "Similarly large" is understood to mean a deviation of up to 20%, preferably up to 10%, and even more preferably up to 5%. The standardization of the connection dimensions of the ports makes it possible to use uniform components, such as valve covers, pipe flanges, or blind flanges. In this sense, it is also advantageous if the connection for the control unit and the connections for the additional air blast devices each have the same number of receiving openings for fastening devices. Due to possible different nominal pressures in the pressure chamber and in the piston pre-chamber, there may also be different numbers of receiving openings for fastening devices between the connection for the control unit and the connection for additional air blast devices.

[0025] The invention encompasses an air blast device comprising an air blast device body as described above, a piston inserted in the piston guide, and a connected control unit. The invention also further encompasses an air blast device with one of the air blast device bodies described above and any blind flanges, connected filling hoses, or external pressure vessels connected to the ports.

[0026] According to a further aspect of the invention, an air conveying and / or cleaning module is proposed for a particularly stepped process chamber, which comprises a plurality of air blast devices having one of the above-described air blast device bodies. The module preferably comprises 2 to 8, more preferably 3 to 5, in particular, for example, 4, such air blast devices. The module also comprises a number of connecting pieces, wherein the air blast devices are coupled to one another in a row using the connecting pieces, forming a common pressure chamber, in order to provide their air outlet openings, preferably at regular intervals, directly or indirectly for connection to the process chamber.

[0027] In general, the volume of the pressure chamber is composed of the volume of the connecting pieces and the volume of the pressure chambers of the air blast devices.

[0028] If required, in order to increase the volume of the pressure chamber, the module can be connected to a pressure vessel that can be filled with external compressed air via the connection for the additional air blast device of an air blast device directly, e.g. by means of a flange, or indirectly via a connecting piece.

[0029] The connection to the process chamber can be made either directly or indirectly via an extension piece such as a blow-out nozzle or a blow-out pipe, possibly with a blow-out nozzle inserted therein, e.g. a hot-fire nozzle.

[0030] A stepped process chamber, as is known per se, is understood to be a process chamber that has at least one stepped wall. For example, some applications provide combustion chambers in which the material introduced into the process chamber remains at each individual stage for a defined time, during which time the material is processed, for example, burned. In a stepped process chamber, a large number of such air blast devices are used per stage. After the defined residence time, the material is cleared away, for example in a cascade using the air blasts emitted by the air blast devices, or is conveyed further stage by stage. The air blast devices of the module are also designed, for example, to clean material buildup on the individual stages of the process chamber.

[0031] The module is preferably inserted horizontally into the wall in the region of a "rise" of the step, so that the air outlet opening can be aligned with a "step" of the step, which forms the residence area of ​​the material. However, the invention is not restricted to a specific geometry of the steps of a process chamber. The connection of the outlet opening of a blow-out nozzle or blow-out pipe to the process chamber can also be made at an angle of attack, e.g. with an angle of attack of 0°, 20°, 40°, 75° and 90°, where an angle of attack is understood to be the angle at which the front part of the blow-out pipe or hot-fire nozzle with the outlet opening is angled relative to the longitudinal axis of the wall opening in which the blow-out pipe or hot-fire nozzle is embedded.

[0032] The invention is not limited to a specific number of air blast devices in a module. On the contrary, depending on the size of the system, the compact shape of the air blast device bodies allows for unlimited expansion, with the framework being determined in particular by the total volume of the shared pressure chamber and its refill time.

[0033] The module may be provided with a blanking plug at its connection for additional air blast devices. The air blast device forms the terminal or final device in the respective module.

[0034] According to one embodiment, the blind plug can be coupled or is coupled to a torque support. Due to the way the air blast device works, with its burst-like release of air, a torque can occur on the piston-valve axis during operation of the terminal air blast device, which can be absorbed by the torque support.

[0035] In one embodiment of the invention, it is provided that the air blast device bodies of the system are of identical design.

[0036] Preferably, the connecting pieces are designed as compensators, particularly preferably in the form of corrugated hoses, to compensate for tolerances in the connections of the air blast devices or pipes to the process chamber, in particular the combustion chamber, and for different thermal expansions. Alternatively, rigid pipe structures can be provided as connecting pieces.

[0037] Preferably, at least one of the air blast devices is connected to an external compressed air source at its connection for additional air blast devices. The connection to the external compressed air source can be achieved using one or two air blast devices in the proposed system.

[0038] Preferably, filling is performed using a single filling hose, which simplifies system maintenance. With the preferred proposed dimensioning of the connections and piston chambers, filling can be performed easily and effectively. For example, a 3 / 4-inch filling hose can be provided, which is inserted into a bore in a blind flange.

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

[0040] The invention also encompasses an air conveying and / or cleaning system with a plurality of the described air conveying and / or cleaning modules, wherein at least one air conveying and / or cleaning module is assigned to a stage of the stepped process space.

[0041] Alternatively, it may be possible to arrange the modules over several stages, but this leads to increased complexity, in particular due to the necessary oblique connection of the air blast devices or possibly even obliquely running axis of the connection for the further air blast devices in the air blast device body.

[0042] Although the invention is described in connection with "air" shocks, it is not limited to this. Other gases, particularly inert gases, can be used as media instead of ambient air, depending on the application.

[0043] Although the invention is described in connection with a 3 / 2-way valve, it is not limited to this. The use of other mechanisms is also possible, which cause the piston to be abruptly moved from the valve seat into an open position and then returned from the open position to the closed position, in particular using, for example, 2 / 2-way valves or quick-exhaust valves and a spring in the piston chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In the following, the invention is described and illustrated in more detail with reference to the figures.

[0045] Showing: Fig. 1 is a perspective view of an air blast device according to an embodiment of the invention, Fig. 2 a sectional view through an air blast device according to an embodiment of the invention, Fig. 3 an air conveying and / or cleaning system for a stepped process chamber according to an embodiment of the invention, Fig. 4 a connection area of ​​two air conveying and / or cleaning modules to each other, and Fig. 5 a connection area of ​​an air conveying and / or cleaning module to a stepped process chamber. EMBODIMENTS OF THE INVENTION

[0046] Fig. Figure 1 shows an air blast device 4 with a one-piece air blast device body 2 according to one embodiment of the invention. The air blast device body 2 comprises a pressure chamber 3 with an air intake volume of, for example, approximately 10 l (cf. Fig. 2).

[0047] The air blast device 4 is suitable for use in an air conveying and / or cleaning module 6 or in an air conveying and / or cleaning system 8, as in Fig. 3 shown.

[0048] The air blast device body 2 comprises a connection 10 for a control unit 30 and an air outlet opening 14, which is arranged opposite the connection 10 for the control unit 30. The connection 10 for the control unit 30 is, for example, but preferably, cylindrically shaped as a block flange, as is the air outlet opening 14. The air blast device body 2 also comprises two connections 12 for additional air blast devices 4, which are also, for example, but preferably, designed as block flanges.

[0049] The control unit 30 comprises a cover 32 which has a central bore as a supply channel 31 for pre-chamber air (see Fig. 2). The cover 32 is secured to the connection 10 for the control unit 30 by means of four fastening screws 36, which engage in corresponding blind holes (not shown), by way of example but not by way of limitation of the invention. In the illustrated embodiment, the control unit comprises a 3 / 2-way valve assembly 34, by way of example but not by way of limitation of the invention.

[0050] At the front side of the connections 12 for further air blast devices 4, four receptacles 38 are also preferably provided, but not restrictively for the invention, which can be equipped with internal threads for receiving screws.

[0051] Fig. 2 shows a sectional view through the air blast device body 2 with a piston assembly inserted therein and part of a connected control unit 30.

[0052] The piston 22 is shown in its closed position and, in the drawing, is mounted in a tubular piston guide 20 for upward and downward movement. The piston guide 20 is formed by a pipe socket that extends into the interior of the pressure chamber 3 of the air blast device body 2. As shown, a pipe section can be inserted into the piston guide 20, which is in direct contact with the piston 22. This is not the subject of the invention, so a more detailed description can be omitted.

[0053] In embodiments not shown, which are also encompassed by the invention, the cover 32 and / or the piston guide 20 can have overflow openings which enable a pressure-conducting connection from the piston pre-chamber into the pressure chamber 3, so that a further filling connection (reference numerals 40 / 46 in Fig. 5) is not necessary for pressure chamber 3.

[0054] Approximately at the level of the second axis B , which is not limiting for the invention, the piston guide 20 ends sufficiently far in front of a valve seat 15 for the piston 22, so that when the valve is open, i.e. with the piston 22 in the open position, a connecting channel 16 is present between the connections 12 for the further air blast devices 4 and the air outlet opening 14 in order to pass through the compressed air blast.

[0055] In the illustrated embodiment, the piston 22 is formed, not restricting the invention, from a central disc 26 and an adjoining piston disc 27, which are connected together with, here for example, two heat protection discs 28 by means of a connecting screw 21 to form a clamping package.

[0056] A piston pre-chamber 24 is formed between the piston 22 and the cover 32 of the control unit 30. The piston pre-chamber 24 is connected via the supply channel 31 to the 3 / 2-way valve assembly 34, which is Fig. 1 is shown.

[0057] A first axis A connects the connection 10 for the control unit 30 and the air outlet opening 14. A second axis B runs perpendicular to the first axis A, which connects the two connections 12 for additional air blast devices 4. The first axis A and the second axis B form a right-angled cross with each other, by way of example but preferably.

[0058] D4 denotes the inner diameter of the valve seat 15. In the pressure chamber 3, the inner diameter D4 of the valve seat 15 is the smallest flow cross-section for the discharge of compressed air. In particular, the surface cross-section of the valve seat 15 is smaller than the surface cross-section in the area of ​​the connecting channel 16.

[0059] The connections 12 for additional air blast devices 4 have an identical diameter D2. The connections 12 for the additional air blast devices 4 are arranged opposite one another in alignment. The previously described receptacles 38 for connection to additional air blast devices 4 via connecting pieces 44 are located on the front sides. Fig. 3 will be described in more detail.

[0060] In the illustrated embodiment, the diameter D3 of the air outlet opening 14 is advantageously, but not restrictive for the invention, the same size as the diameter D1 of the connection 10 for the control unit 30 and the same size as the diameter D2 of the connections 12 for the further air blast devices 4.

[0061] The air blast device 4 is based on the principle that the medium stored in the pressure chambers 3, in the connecting pieces 44 and possibly in a pressure vessel, in particular air or an inert gas, is suddenly blown out via the air outlet opening 14.

[0062] The air blast device body 2 is first filled with compressed air via an external compressed air connection, as described in connection with Fig. 5. Likewise, the piston prechamber 24 is filled with prechamber air.

[0063] The pressure of the pre-chamber air in the piston pre-chamber 24 causes the piston 22 to be pressed against the valve seat 15 provided at the air outlet opening 14. This closes the air outlet opening 14, as shown in Fig. 2 shown.

[0064] The blow-out process is controlled by the 3 / 2-way valve assembly 34. In one position, the 3 / 2-way valve assembly 34 enables the air outlet opening 14 to be closed by the piston 22 engaging the valve seat 15, and in the other position, the piston pre-chamber 24 to be vented, i.e., the air outlet opening 14 is opened, which triggers a sudden return movement of the piston 22 and abutment against a damping ring 25, thus generating the air blast by discharging the pressure from the pressure chamber 3.

[0065] When the 3 / 2-way valve assembly 34 is actuated, the piston pre-chamber 24 is vented. As a result, the medium stored in the pressure chambers 3 and in the connecting pieces 44 acts on the piston and pushes the piston 22 against the cover 32. This allows the compressed air from the interior of the air blast device body 2 to escape suddenly via the air outlet opening 14.

[0066] After the air blast is released, the air blast device body 2 is again filled with compressed air via the external compressed air connection. Likewise, the piston pre-chamber 24 is refilled with pre-chamber air. The air blast device 4 is ready for use again.

[0067] Fig. Figure 3 shows an air conveying and / or cleaning system 8 with five fully illustrated air conveying and / or cleaning modules 6 according to one embodiment of the invention, purely by way of example. The air conveying and / or cleaning module 6 is referred to below as "module 6." The air conveying and / or cleaning system 8 is referred to below as "system 8."

[0068] The system 8 is arranged on the wall 50 of a stepped processing chamber. The processing chamber comprises a plurality of steps 52, each of which includes a holding surface 54 for the material to be processed and inclines 56, which here, for example, but not restrictively for the invention, are arranged at 90° to each other in the form of a staircase. The size of the holding surfaces 54, the inclines 56, and also their number are expediently determined according to the type of desired application.

[0069] Although in Fig. 3 five modules 6 are fully shown, the system is not limited to this, but in principle can be expanded as desired.

[0070] In the illustrated embodiment in Fig. 3, a module 6 comprises four air blast devices 4, which are coupled together by means of connecting pieces 44. The pressure chambers 3 of the air blast devices 4 and the volume of the connecting pieces 44 form a common pressure chamber. The connecting pieces 44 are attached to the respective connections 12 for the other air blast devices 4, for example, by means of screws.

[0071] In the illustrated embodiment, the connecting pieces 44 are designed as corrugated hose expansion joints, for example, made of metal. Alternatively, rigid pipe constructions (not shown) can be used.

[0072] The module 6 is, on the one hand, fastened to the wall 50 of the stepped process chamber by means of a torque support 48 and, on the other hand, supported by a further torque support 48 against another module 6 arranged next to it, here arranged on the same step 52.

[0073] To convey the material to be processed in the stepped process chamber, the air blast devices 4 are preferably individually controlled to release compressed air. If this occurs, for example, across an entire stage 52, the material located there is blown onto the stage below. The control is not the subject of the invention and is subject to the conditions of the required application.

[0074] Fig. 4 shows a connection area of ​​two modules 6, each depicting the terminal air blast device 4 of module 6. The terminal modules 6 are each provided with a blind flange 40. Due to the effect of the torque during the air blast, a lateral impulse occurs in the terminal air blast devices 4, which is absorbed by the torque support 48. The blind flanges 40 are fastened by means of a long nut 49 with threaded bolts, by way of example but not limiting the invention, in order to clamp the terminal air blast device 4 against the torque support 48.

[0075] Furthermore, Fig. 4 shows a connecting hose 47 for the prechamber air, which connects the control unit 30 of one air blast device 4 with the control unit 30 of another air blast device 4. The connecting hose 47 is designed appropriately depending on the required pressure and tightness requirements, e.g., as a 1 / 2-inch hose.

[0076] Fig. Figure 5 shows a terminal air blast device 4, which is provided with a connecting hose 46 for connection to an external pressure source, e.g., a 3 / 4-inch hose. For this purpose, the air blast device 4 has a blind flange 40 attached to the connection 12, which has a through-opening for connecting the connecting hose 46. The blind flange 40, which in turn is attached by screws to the connection 12 for the additional air blast device 4, also has the torque support 48 attached for connecting the module 6 to the wall 50 of the stepped process chamber.

[0077] Alternatively, but not shown, instead of the blind flange 40, a direct connection, e.g. flange connection or an indirect connection of the module 6 to a pressure vessel that can be filled with external compressed air, provided via a connecting piece 44, can be provided.

[0078] Fig.Figure 5 also shows an exhaust pipe 42 connected to the air outlet opening 14 and, on the other hand, to the retention surface 54 of a step 52 of the process chamber. Although a vertical connection of the exhaust pipe 42 to the step 52 is shown, angled connections are also possible. REFERENCE SYMBOL

[0079] 2 Air blast device body; 3 Pressure chamber; 4 Air blast device; 6 Module; 8 System; 10 Control unit connection; 12 Connection for additional air blast device; 14 Air outlet opening; 15 Valve seat; 16 Connecting channel; 20 Piston guide; 21 Connecting screw; 22 Piston; 24 Piston pre-chamber; 25 Damping ring; 26 Center disc; 27 Piston disc; 28 Heat protection disc; 30 Control unit; 31 Pre-chamber air supply channel; 32 Cover; 34 3 / 2-way valve assembly; 36 Fastening screw; 38 Holder; 40 Blind flange; 42 Blow-out pipe; 44 Connecting piece; 46 Connecting hose for external pressure source; 47 Connecting hose for pre-chamber air; 48 Torque support; 49 Long nut; 50 Wall; 52 Step; 54 Retention area; 56 Gradient;

[0080] A first axis; B second axis; D1 diameter of control unit connection; D2 diameter of additional air blast device connection; D3 diameter of additional air blast device connection; D4 inner diameter of valve seat QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] EP 1 528 013 A1

[0005] EP 2 272 776 A1

[0006]

Claims

[1] One-piece air blast device body (2) with a pressure chamber (3) surrounding a piston guide (20) for receiving a piston (22) and a valve seat (15) for the piston (22), a connection (10) for a control unit (30) for controlling the position of the piston (22) and with an air outlet opening (14), characterized by that the air blast device body (2) also comprises at least two further connections (12) for further air blast devices (4). [2] Air blast device body (2) according to claim 1, characterized by that the air blast device body (2) has exactly two connections (12) for two further air blast devices (4), which are preferably arranged in alignment opposite one another. [3] Air blast device body (2) according to one of the preceding claims, characterized bythat a first axis (A), which connects the air outlet opening (14) and the connection (10) for the control unit (30), and a second axis (B), which connects the two connections (12) for the two further air blast devices (4), form a preferably right-angled cross. [4] Air blast device body (2) according to one of the preceding claims, characterized by that the connection (10) for the control unit (30), the connections (12) for the further air blast devices (4) and / or the air outlet opening (14) are designed as block flanges. [5] Air blast device body (2) according to one of the preceding claims, characterized by that in the pressure chamber (3) a smallest flow cross-section for the release of compressed air is formed by an inner diameter (D4) of the valve seat (15). [6] Air blast device body (2) according to one of the preceding claims, characterized bythat a diameter (D1) of the connection (10) for the control unit (30) is similar in size, preferably the same size, as a diameter (D2) of the connection (12) for the further air blast device (4) and / or as a diameter (D3) of the air outlet opening (14). [7] Air blast device (4) with an air blast device body (2) according to one of the preceding claims, with a piston (22) inserted in the piston guide (20) and a connected control unit (30). [8] Air conveying and / or cleaning module (6) for a particularly step-shaped process chamber, comprising several, preferably two to eight, more preferably three to five, particularly preferably four air blast devices (4) according to claim 7, characterized bythat the air blast devices (4) are coupled together in a row by means of connecting pieces (44) and to form a common pressure chamber in order to provide their air outlet openings (14) directly or indirectly for connection to the process chamber at preferably uniform intervals. [9] Air conveying and / or cleaning module (6) according to claim 8, characterized by that at least one of the air blast devices (4) is provided with a blind flange (40) at its connection (12) for the further air blast device (4), which is preferably coupled to a torque support (48). [10] Air conveying and / or cleaning module (6) according to one of claims 8 or 9, characterized by that the air blast device bodies (2) of the system are identically designed. [11] Air conveying and / or cleaning module (6) according to one of claims 8 to 10, characterized bythat the connecting pieces (44) are designed as compensators, in particular in the form of corrugated hoses. [12] Air conveying and / or cleaning module (6) according to one of claims 8 to 11, characterized by that at least one of the air blast devices (4) is coupled to an external compressed air source at its connection (12) for the further air blast device (4). [13] Air conveying and / or cleaning module (6) according to one of claims 8 to 12, characterized by that the air blast devices (4) are preferably each individually connected to control units (30) via their connections, wherein the control units (30) are preferably connected to one another via connecting hoses (47). [14] Air conveying and / or cleaning system (8) with a plurality of air conveying and / or cleaning modules (6) according to one of claims 8 to 13, characterized bythat at least one air conveying and / or cleaning module (6) is assigned to a stage (52) of a step-shaped process space.

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