Unitary body of an air cannon, air cannon, module et system therewith

Abstract

The invention relates to a 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 an air outlet opening (14). The air blast device body (2) also includes at least two further connections (12) for additional air blast devices (4) to form a common pressure chamber. The invention further relates to an air blast device (4) with such an air blast device body (2) and an air conveying and / or cleaning module (6) for a process chamber, in particular a stepped one.

Description

[0001] The invention relates to a one-piece formed 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 loosen material build-up from surfaces of a process chamber or to convey material in a process chamber.

[0003] Air burst devices are based on the principle that a medium stored in a pressure chamber, such as air or inert gases, is suddenly discharged through a discharge opening. A forced-action pressure pulse is exerted via a valve unit, so that compressed air is abruptly blown from the air burst device to a discharge point, generally formed by a discharge nozzle, from where the compressed air then enters the process chamber. Preferably, the exiting air jet is blown into the interface between a wall of the process chamber and the deposited material, as the lowest adhesive forces exist there.

[0004] Air blast devices are frequently used in process chambers with high operating temperatures, e.g., up to 1200°C, where an aggressive chemical atmosphere typically prevails inside the chambers. Within the scope of the present invention, such process chambers are also referred to as combustion chambers. The discharge nozzle is made of a heat-resistant cast material (hot-firing nozzle). Installing a discharge nozzle in existing wall openings is possible at any time and can, in particular, be carried out subsequently from the outside using a suitable core drilling process. In systems with particularly high heat generation, long discharge nozzles can be provided to protect the valve unit, especially the piston assembly of the air blast device, from the effects of heat.

[0005] From EP 1 528 013 A1, an air burst device is known 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 movable piston for the sudden expulsion of a stored medium. The valve unit is essentially located inside the pressure vessel. Such air burst devices are complex to manufacture and limit design variability and maintainability, as the valve unit and the discharge pipe are generally difficult to access within the pressure vessel. Furthermore, the use of a large-volume pressure vessel is disadvantageous when used in an air conveying and / or cleaning system.

[0006] From EP 2 272 776 A1, a one-piece air blast device body according to the preamble of claim 1 is known. 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 connection 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. TASK OF INVENTION

[0007] The invention is based on the objective of proposing an air blast device body, an air blast device, an air conveying and / or cleaning module, as well as an air conveying and / or cleaning system for process rooms, which can be manufactured cost-effectively, in particular without welding. The module and the system should be of low complexity and adaptable to different process room sizes. A further objective of the invention is to provide a particularly maintenance-friendly system. REVELATION OF THE INVENTION

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

[0009] The task is also solved by an air blast device, an air conveying and / or cleaning module and an air conveying and / or cleaning system for process rooms, which include at least one such air blast device body.

[0010] The air blast unit body is very compact due to the combination of the piston-valve assembly necessary for its operation with connections for additional air blast units to expand the system, thereby reducing the system's volume. Its distributor functionality makes the air blast unit body advantageously suited for use in adaptive air conveying and / or cleaning systems for a variety of process spaces, particularly combustion chambers. The reduction in individual parts and the integration of multiple functionalities into a single component significantly improves system maintenance.

[0011] The air blast device body according to the invention is manufactured in one piece using a casting process. This eliminates welding, which is complex due to the required compactness of the body and the limited accessibility of the weld points. A disadvantage of welding is that the weld seams must sometimes be subjected to X-ray inspection to ensure their quality, which leads to additional costs.

[0012] The pressure chamber has, for example, an air intake volume of 2 to 20 l, preferably 5 to 15 l, and particularly preferably 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 integrated into the air blast device body itself. Alternatively, the stop surface can be formed by an additional component, such as a screw-in ring, press-fit ring, or cast-in ring. The piston's contact with the valve seat closes the air outlet.

[0014] Particularly when used in stepped process chambers, it proves especially advantageous if the air blast unit body has exactly two connections for two further air blast units, which are preferably arranged opposite each other in alignment. This allows the system to be linearly extended in one direction to form a common pressure chamber, using connecting pieces that can be, for example, rigid pipe constructions or corrugated hoses. The air blast unit body is particularly suitable for use in a module designed to position several air blast units along a step of the process chamber.

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

[0016] In 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 further air blast devices, form a cross with each other. 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 accessible from all sides, which simplifies maintenance and parts replacement. Secondly, the air blast body is easy to calculate and model, allowing for foundry-specific optimization of the internal dimensions of the flow channels, the location of blind holes, burrs, edges, and similar features. One optimization goal can be to minimize turbulence during the air blast to reduce energy losses.

[0018] The connection of components to be attached, such as covers, pipes, pipe flanges, blind flanges, etc., to the connections and the air outlet opening can be achieved through positive and / or non-positive locking, by means of screwing, clamping, external and / or internal threads, clamping, shrinking, or the like, with or without additional fasteners, whereby reference may be made to the relevant specialist knowledge. The connections of the air blast unit body can be designed in a variety of ways accordingly. Preferably, they are designed as connection flanges.

[0019] Although the invention is described in connection with screw connections, i.e., screws as fasteners, it is not limited to this. The connection of the components, particularly to form a common pressure chamber, can be made in any way; however, detachable connections are preferred, especially screw connections, pin connections, or threaded connections, i.e., a direct screwing of the component to be connected to the respective connection, e.g., a connecting flange. Screw connections are preferred, however, due to their accessibility and ease of maintenance.

[0020] It has proven particularly advantageous if the connections and / or the air outlet are designed as block flanges, as this results in a particularly compact body design and allows access to the fasteners used for connecting the other components from the outside. The block flanges are provided with receptacles for fasteners, preferably four to eight, and more preferably four. Preferably, for ease of maintenance, the receptacles for fasteners are designed as screw holes with a corresponding internal thread. Blind holes in the block flanges can be provided as screw holes.

[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 the smallest flow cross-section for the discharge of compressed air is formed by the inner diameter of the valve seat. Independently of this, the inner diameter at the connections for the further air blast device is preferably similarly sized, or at least equal to or larger than the inner diameter of the valve seat.

[0023] Regarding the outer diameters: In an advantageous embodiment, the diameter of the connection for the control unit is similar to, preferably the same as, the diameter of the connection for the additional air blast device. Furthermore, it is preferably provided that the diameter of the connection for the additional air blast device is similar to, preferably the same as, the diameter of the air outlet opening. Alternatively or additionally, it is provided that the diameter of the connection for the control unit is similar to, preferably the same as, 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%. Standardizing the connection dimensions allows for the use of uniform components, such as valve covers, pipe flanges, or blind flanges. In this context, it is further advantageous if the connection for the control unit and the connections for the additional air blast devices each have the same number of mounting openings for fasteners. Due to potentially different nominal pressures in the pressure chamber and the piston pre-chamber, the number of mounting openings for fasteners may also differ 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 an attached 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, 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 for a process chamber, particularly a stepped one, is proposed, comprising several air blast devices, each having one of the air blast device bodies described above. Preferably, the module comprises 2 to 8, more preferably 3 to 5, and 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 by means of the connecting pieces, forming a common pressure chamber, in order to provide their air outlet openings, preferably at uniform intervals, directly or indirectly for connection to the process chamber.

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

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

[0029] The connection to the process chamber can be either direct or indirect 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-firing nozzle.

[0030] A stepped process chamber, as is known per se, is understood to be a process chamber that has at least a stepped wall. For example, in some applications, combustion chambers are provided in which the material introduced into the process chamber remains on each step for a defined period of time, during which the material is processed, for example, by combustion. In a stepped process chamber, a number of such air blowers are used per step. After the defined residence time, the material is removed, for example, in a cascade-like manner by means of the air blowers emitted, or conveyed further step by step. The air blowers of the module are also designed, for example, to clean material build-up on the individual steps of the process chamber.

[0031] The module is preferably inserted horizontally into the wall in the area of ​​a step's incline, so that the air outlet opening can be aligned with a step's entry point, which forms the material's residence surface. However, the invention is not limited to a specific geometry of the steps in a process chamber. The connection of the outlet opening of a blow-off nozzle or blow-off pipe to the process chamber can also be at an angle, e.g., at an angle 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-off pipe or hot-firing nozzle with the outlet opening is angled relative to the longitudinal axis of the wall penetration in which the blow-off pipe or hot-firing 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, it can, in principle, be expanded indefinitely due to the compact form of the air blast device bodies, with the framework conditions being determined in particular by the total volume of the common pressure chamber and its refill time.

[0033] The module may be designed so that at least one of the air blast devices is fitted with a blanking plug at its connection for further air blast devices. The air blast device thus forms the termination or end device in the module in question.

[0034] In one embodiment, the blanking plug can be coupled to, or is coupled to, a torque support. Due to the operating principle of the air blast device with its pulsating air discharge, 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, the air blast device bodies of the system are designed identically.

[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 blowers or pipes to the process chamber, especially the combustion chamber, and for differing thermal expansions. Alternatively, rigid pipe constructions can be used as connecting pieces.

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

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

[0039] Preferably, the air blast devices are each individually connected to control units via their connections, with the control units preferably being interconnected 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 includes 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 effort, especially due to the necessary diagonal connection of the air blast devices or possibly even an diagonal 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. Alternative gases to ambient air, particularly inert gases, can be advantageously used as media, 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 moved abruptly from the valve seat into an open position and from the open position back to the closed position, in particular using, for example, 2 / 2-way valves or quick-release valves and a spring in the piston chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The invention will be described and illustrated in more detail below with reference to the figures.

[0045] This shows: Fig. 1 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 one 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 connected to each other, and Fig. 5 a connection area of ​​an air conveying and / or cleaning module to a stepped process room. FORMS OF EXECUTION OF THE INVENTION

[0046] Fig. 1 Figure 1 shows an air blast device 4 with a one-piece formed air blast device body 2 according to an 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 (see Figure 2). Fig. 2 ).

[0047] The air pulse 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 depicted, to be used.

[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, by way of example, but preferably, designed as a cylindrical block flange, as is the air outlet opening 14. The air blast device body 2 also comprises two connections 12 for further air blast devices 4, which are likewise, by way of example, but preferably, designed as block flanges.

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

[0050] At the connections 12 for further air blast devices 4, four receptacles 38 are also preferably provided on the front face, but this is not a limitation of the invention, which may 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 an attached control unit 30.

[0052] The piston 22 is shown in its closed position and, in the drawing, is mounted to move up and down in a tubular piston guide 20. The piston guide 20 is formed by a pipe stub 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 part of the invention, so a more detailed description is unnecessary.

[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 that allow a pressure-conducting connection from the piston pre-chamber to the pressure chamber 3, so that a further filling port (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 a limitation 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 available between the connections 12 for the further air pulse devices 4 and the air outlet opening 14 in order to pass through the compressed air pulse.

[0055] In the illustrated embodiment, without limiting the invention, the piston 22 is formed from a central disk 26 and a piston disk 27 adjoining it, which together with two heat protection disks 28 (exemplarily) are connected to form a clamping package by means of a connecting screw 21.

[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 feed channel 31 to the 3 / 2-way valve assembly 34, which is located in 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, forming the two connections 12 for further air blast devices 4. Here, the first axis A and the second axis B form, by way of example but preferably, a right-angled cross.

[0058] D4 denotes an 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 cross-sectional area of ​​the valve seat 15 is smaller than the cross-sectional area in the region 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 each other in alignment. On the end faces are the previously described receptacles 38 for connection to additional air blast devices 4 via connecting pieces 44, which are related to Fig. 3 will be described in more detail.

[0060] The diameter D3 of the air outlet opening 14 is advantageously, but not limitingly 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 diameters D2 of the connections 12 for the further air blast devices 4 in the illustrated embodiment.

[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 previously described in connection with Fig. 5 is described. Likewise, the piston pre-chamber 24 is filled with pre-chamber 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 depicted.

[0064] The blow-off process is controlled by the 3 / 2-way valve assembly 34. In one position, the 3 / 2-way valve assembly 34 allows the air outlet opening 14 to be closed by the piston 22 resting in 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 retraction of the piston 22 and a stop against a damping ring 25, thus generating the air blast by releasing 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. This causes the medium stored in the pressure chambers 3 and in the connecting pieces 44 to act on the piston and push the piston 22 against the cover 32. This allows the compressed air from inside the air blast device body 2 to escape abruptly through the air outlet opening 14.

[0066] After the air blast is released, the air blast device body 2 is refilled 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 then ready for use again.

[0067] Fig. 3 Figure 1 shows an air conveying and / or cleaning system 8 with five fully illustrated air conveying and / or cleaning modules 6, shown here purely as examples, according to one embodiment of the invention. The air conveying and / or cleaning module 6 is hereinafter referred to as "Module 6". The air conveying and / or cleaning system 8 is hereinafter referred to as "System 8".

[0068] System 8 is arranged on the wall 50 of a stepped process chamber. The process chamber comprises a plurality of steps 52, each of which includes a dwelling area 54 for the material to be processed and risers 56, which, for example, but not limited to the invention, are arranged at 90° to each other in the form of a staircase. The dimensions of the dwelling areas 54, the risers 56, and their number are expediently determined according to the type of application required.

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

[0070] In the illustrated embodiment in Fig. 3 A module 6 comprises four air blast devices 4, which are coupled to one another by means of connecting pieces 44. The pressure chambers 3 of the air blast devices 4 and the volume of the connecting pieces 44 together 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 compensators, for example made of metal. Alternatively, rigid pipe constructions can be used (not shown).

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

[0073] To convey the material to be processed in the stepped process chamber, the air blowers 4 are preferably controlled individually to release compressed air. If this occurs, for example, over an entire step 52, the material located on that step is blown onto the step below. The control mechanism is not part of the invention and is subject to the conditions of the required application.

[0074] Fig. 4 Figure 1 shows a connection area of ​​two modules 6, with the terminal air blast device 4 of each module 6 depicted. The terminal modules 6 are each provided with a blind flange 40. Due to the torque exerted during the air blast, a lateral impulse occurs in the terminal air blast devices 4, which is absorbed by the torque support 48. For this purpose, the blind flanges 40 are, by way of example but not limiting to the invention, fastened by means of a long nut 49 with threaded bolts to clamp the terminal air blast device 4 against the torque support 48.

[0075] Furthermore, in Fig. 4 A connecting hose 47 for the pre-chamber air is shown, which connects the control unit 30 of one air burst device 4 with the control unit 30 of another air burst device 4. The connecting hose 47 is appropriately designed depending on the required pressure and sealing requirements, e.g. as a 1 / 2 inch hose.

[0076] Fig. 5 Figure 1 shows a terminal air blast device 4, which is equipped 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 torque support 48 for connecting the module 6 to the wall 50 of the stepped process chamber is also attached to the blind flange 40, which in turn is attached by means of screws to the connection 12 for the other air blast device 4.

[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 via a connecting piece 44 may be provided.

[0078] Fig. 5 Figure 1 also shows a discharge pipe 42 connected to the air outlet opening 14 and, on the other side, to the residence area 54 of a stage 52 of the process chamber. Although a vertical connection of the discharge pipe 42 to the stage 52 is shown, angled connections are also possible. BEZUGSZEICHEN

[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 washer; 27 Piston washer; 28 Heat shield; 30 Control unit; 31 Pre-chamber air supply channel; 32 Cover; 34 3 / 2-way valve assembly; 36 Mounting screw; 38 Mounting bracket; 40 Blind flange; 42 Exhaust tube; 44 Connector; 46 External pressure source connection hose; 47 Pre-chamber air connection hose; 48 Torque support; 49 Long nut; 50 Wall; 52 Stage; 54 Dwell area; 56 Pitch; A First axis; B Second axis; D1 Diameter of connection for control unit; D2 Diameter of connection for additional air blast device; D3 Diameter of connection for additional air blast device; D4 Inner diameter of valve seat

Claims

1. One-piece formed 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 the fact that the air blast device body (2) also includes at least two further connections (12) for further air blast devices (4) to form a common pressure chamber.

2. Air blast device body (2) according to claim 1, characterized by the fact that the air blast device body (2) has exactly two connections (12) for two further air blast devices (4), which are preferably arranged opposite each other in alignment.

3. Air blast device body (2) according to one of the preceding claims, characterized by the fact thata 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 blow devices (4) form a preferably right-angled cross.

4. Air blast device body (2) according to one of the preceding claims, characterized by the fact that the connection (10) for the control unit (30), the connections (12) for the additional 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 the fact that in the pressure chamber (3) a smallest flow cross-section for the discharge 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 by the fact thata 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 connected control unit (30).

8. Air conveying and / or cleaning module (6) for a process chamber, in particular a stepped one, comprising several air pulse devices (4) according to claim 7, preferably 2 to 8, more preferably 3 to 5, in particular preferably 4, such air pulse devices (4), characterized by the fact thatThe air blast devices (4) are coupled together in a series by means of connecting pieces (44) and forming a common pressure chamber in order to provide their air outlet openings (14) at preferably uniform intervals directly or indirectly for connection to the process chamber.

9. Air conveying and / or cleaning module (6) according to claim 8, characterized by the fact that at least one of the air blast devices (4) is provided at its connection (12) for the further air blast device (4) with a blind flange (40), 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 the fact 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 by the fact that 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 the fact that at least one of the air blast devices (4) is coupled at its connection (12) for the further air blast device (4) to an external compressed air source.

13. Air conveying and / or cleaning module (6) according to any one of claims 8 to 12, characterized by the fact that The air blast devices (4) are preferably each individually connected to control units (30) via their connections, the control units (30) being preferably connected to each other 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 any one of claims 8 to 13, characterized by the fact that Each at least one air conveying and / or cleaning module (6) is assigned to a stage (52) of a staged process room.

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