Unitary expandable air impact device body and expandable air impact device

Abstract

The invention relates to a one-piece, expandable air blast device body (4) 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 (18) for a pressure vessel (6), a connection (10) for a control unit (30) for controlling the position of the piston (22), and an air outlet opening (14). The expandable air blast device body (4) also includes at least one, preferably three, connections (12) for further air blast device bodies (4, 5) to form a common pressure chamber. The invention further relates to an air blast device (8) comprising at least one such expandable air blast device body (4).

Description

[0001] The invention relates to a one-piece, expandable air blast device body according to the preamble of claim 1, and to an expandable air blast device. 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 blast 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 ejection of a stored medium. The valve unit is essentially located inside the pressure vessel. Such air blast devices are complex to manufacture and limit design variability and maintainability, as the valve unit and the discharge tube are generally difficult to access within the pressure vessel.

[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 unit body and an air blast unit that can be manufactured cost-effectively, in particular without welding. The air blast unit should be low-complexity and adaptable to different process chamber sizes. A further objective of the invention is to provide a particularly easy-to-maintain air blast unit. REVELATION OF THE INVENTION

[0008] The problem is solved by a one-piece, expandable 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 pressure vessel, a connection for a control unit for controlling the position of the piston, an air outlet opening and with at least one, preferably three, connections for further air blast device bodies to form a common pressure chamber.

[0009] The task is also solved by an expandable air blast device that includes at least one such expandable air blast device body.

[0010] The "one-piece, expandable air blast unit body" is referred to below as the "expandable air blast unit body." The expandable air blast unit body is very compact due to the combination of the piston-valve assembly necessary for the air blast unit's operation with connections for additional air blast unit bodies, thus reducing the air blast unit's volume. Thanks to its distribution functionality, an air blast unit incorporating the expandable air blast unit body is itself expandable, adaptable to various process chamber sizes, and particularly suitable for use in confined spaces. The reduction in individual parts and the integration of multiple functionalities into a single component significantly improve the maintenance of the air blast unit body.

[0011] The expandable air blast device body according to the invention is manufactured in one piece using a casting process. This eliminates the need for welding connecting parts to other air blast device bodies. A disadvantage of welding is that the welds must sometimes be subjected to X-ray inspection to ensure their quality, which leads to additional costs.

[0012] The valve seat provided in the expandable 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 expandable 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.

[0013] Preferably, because it is particularly compact and accessible, the expandable air blast device body is essentially cube-shaped or essentially cuboid-shaped, with the connection for the pressure vessel, the connection for the control unit, the air outlet opening and three connections for further air blast device bodies forming the sides of the cube or cuboid.

[0014] It proves advantageous if the expandable air blast device body has two connections for two further air blast device bodies, which are arranged opposite each other in alignment.

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

[0016] The connection for the pressure vessel and a connection for one of the other air blast device bodies are preferably arranged opposite each other in alignment.

[0017] According to an advantageous embodiment, it is provided that axes, which each connect two connections or the air outlet opening and a connection for the control unit, form a double cross with each other and are preferably perpendicular to each other.

[0018] A first axis connects two of the connections for the additional air blast units. A second axis connects one of the connections for the additional air blast units and the connection for the pressure vessel. A third axis connects the air outlet opening and the connection for the control unit.

[0019] 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.

[0020] 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.

[0021] The symmetrical arrangement of the connections offers several advantages. Firstly, the body, and thus the air blast unit, is equally accessible from all sides, which simplifies maintenance and parts replacement. Secondly, the air blast unit body is easy to calculate and model, allowing for the optimization of the specific internal dimensions of the flow channels, the location of blind holes, burrs, edges, and similar features for foundry applications. One optimization goal can be to minimize turbulence during the air blast to reduce energy losses.

[0022] It has proven particularly advantageous if the connection for the control unit, the connections for additional air blast device bodies, and / or the air outlet are designed as block flanges, since this results in a particularly compact design of the body and allows the fasteners used to connect the other components to be accessed from the outside. The block flanges are provided with receptacles for fasteners, preferably four to twelve, and more preferably eight. 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.

[0023] As an alternative to the embodiment as a block flange, it can be provided that the flanges are designed as pipe flanges to provide the receptacles for fastening means.

[0024] In a preferred embodiment, the connection for the pressure vessel is designed as a pipe flange. The pipe flange comprises a pipe stub and an outwardly projecting projection for providing mounting points for fasteners. Advantageously, the expandable air blast unit is compatible with a pressure vessel with a block flange. Furthermore, it is possible to connect several expandable air blast units to one another via the pipe flange, thus extending the air blast unit. The pipe stub can have a suitable length for this purpose, for example, from 5 cm to 30 cm, preferably from 10 cm to 15 cm. The expandable air blast units are sufficiently spaced apart from one another via the pipe stub.

[0025] Regarding the outer diameters: In order to connect several expandable air blast device bodies to one another, it is preferably provided that a diameter of a connection for a further air blast device body is similar in size, preferably the same size, as a diameter of the connection for the pressure vessel, and that the connection for the further air blast device body has receptacles for fastening means which are designed to be compatible with corresponding receptacles for fastening means of the connection for the pressure vessel.

[0026] In an advantageous embodiment, the diameter of the connection for the control unit is similar to, and preferably the same as, the diameter of a connection for a further air blast device body. Furthermore, it is preferably provided that the diameter of a connection for a further air blast device body is similar to, and 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, and preferably the same as, the diameter of the air outlet opening.

[0027] "Similarly sized" 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 connections each have the same number of mounting openings for fasteners. Due to potentially differing nominal pressures in the pressure chamber and the piston pre-chamber, different numbers of mounting openings for fasteners may also exist between the connection for the control unit and the connection for additional air blast device components.

[0028] 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.

[0029] An expandable air blast device comprises at least one of the described expandable air blast device bodies. Preferably, the expandable air blast device has several air blast device bodies that are coupled to one another directly and / or by means of connecting pieces, forming a common pressure chamber. The additional air blast device bodies can also be expandable air blast device bodies or non-expandable air blast device bodies.

[0030] For the purposes of this disclosure, "non-expandable air blast device bodies" are defined as air blast device bodies that have a connection to an external pressure source and, generally, but not limited to the invention, usually in the form of a T-piece, from which the valve-piston assembly with the air outlet opening extends perpendicularly. A multitude of embodiments are known to those skilled in the art, e.g., from EP 2 272 776 A1.

[0031] Since the expandable air blast device body according to the invention has at least one, preferably three, connections for further air blast device bodies, the air blast device body can be expanded by means of blind flanges to form an air blast device comprising one to four air blast device bodies. In particular, the expandable air blast device can have exactly one expandable air blast device body and connected to it one to three non-expandable air blast device bodies, which are directly connected to the expandable air blast device body at the connections for further air blast device bodies.

[0032] The invention is not limited to a specific number of air blast bodies in the air blast device, since the air blast device is expandable.

[0033] In particular, the expandable air blast device can have at least two expandable air blast device bodies, wherein a connection for a further air blast device body of a first expandable air blast device body is directly connected to the connection for the pressure vessel of a second air blast device body, forming a common pressure chamber.

[0034] The expandable air blast device can have several non-expandable air blast device bodies, which are directly connected to the expandable air blast device bodies at the connections for further air blast device bodies, forming a common pressure chamber.

[0035] For each expandable air blast device body, up to three non-expandable air blast device bodies can be added to the expandable air blast device.

[0036] In general, the volume of the pressure chamber of the air blast device consists of the volume of the pressure vessel, the volume of the pressure chambers of the air blast device bodies and, if present, the volume of connecting pieces.

[0037] Generally, every air blast unit body, expandable or non-expandable, has a piston inserted in the piston guide and an attached control unit. The expandable air blast unit may also include valve covers or blanking flanges attached to the ports.

[0038] The expandable air blast device comprises at least one connected pressure vessel, preferably with a volume of 10 to 500 l, more preferably 50 to 150 l. The pressure vessel can be directly connected to the corresponding port of the expandable air blast device body via a connection flange. Alternatively, the expandable air blast device can also be used without a pressure vessel if the volume of the combined pressure chambers of the air blast device bodies is sufficient.

[0039] For example, due to space constraints, it may be necessary to connect two air blast bodies, e.g., two expandable air blast bodies, or one expandable air blast body and one non-expandable air blast body, via connecting pieces, such as pipes.

[0040] Preferably, the expandable air blast device bodies 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.

[0041] 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.

[0042] 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

[0043] The invention will be described and illustrated in more detail below with reference to the figures.

[0044] This shows: Fig. 1 a perspective view of an expandable air blast device according to an embodiment of the invention, Fig. 2 a side view of the expandable air blast device from Fig. 1 , Fig. 3 a front view of the expandable air blast device from Fig. 1 , Fig. 4 a perspective view of an expandable air blast device body according to an embodiment of the invention with an attached control unit, Fig. 5 a sectional view through the expandable air blast device body of Fig. 4 , Fig. 6 a perspective view of an expandable air blast device body according to an embodiment of the invention and Fig. 7 a sectional view through the air blast device body of Fig. 6 . FORMS OF EXECUTION OF THE INVENTION

[0045] Fig. 1 shows a perspective view of an expandable air blast device 8 according to an embodiment of the invention. Fig. 2 and Fig. 3 show a side view and a front view of the expandable air blast device 8.

[0046] The expandable air blast device 8 comprises an expandable air blast device body 4 and, by way of example, two non-expandable air blast device bodies 5 connected thereto, which may be designed in a known manner with respect to the position of their connections in a T-shape, with compressed air connection and piston / control unit, e.g. as from EP 2 272 776 A1, Fig. 1 it is known.

[0047] A pressure vessel 6 is connected to the expandable air blast unit 4 at a connection 18 designed as a pipe flange. The two non-expandable air blast unit bodies 5 are connected to opposite sides of the expandable air blast unit body 4. A control unit 30 is connected to the front of the expandable air blast unit body 4. The non-expandable air blast unit bodies 5 are also equipped with control units 30.

[0048] The expandable air blast device body 4 accordingly comprises a connection 10 for the 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. In the illustrated embodiment, the expandable air blast device body 4 also comprises three connections 12 for further air blast device bodies 4, 5, 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 e.g. Fig. 5 The cover 32 is fastened to the connection 10 for the control unit 30 by means of eight 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 to the invention, a 3 / 2-way valve assembly 34.

[0050] The control units 30 are interconnected by means of connecting hoses 47 for the pre-chamber air. The connecting hoses 47 are appropriately designed according to the required pressure and sealing requirements, e.g. as 1 / 2 inch hoses. As shown in Figur 4 The connecting hoses 47 are shown joined at a filling assembly 35. The filling assembly 35 is known per se and is not the subject of the present invention, so a detailed description is unnecessary.

[0051] On the underside, the expandable air blast device body 4 is closed at the connection 12 for a further air blast device body 4, 5 with a blind flange 44.

[0052] Instead of the blind flange 44, a further, i.e., in the illustrated case a third, non-expandable air blast unit 5 (not shown) can be connected via the connection 12. The third non-expandable air blast unit 5 is, for example, identical in design to the two other non-expandable air blast unit bodies 5 shown.

[0053] Instead of the blind flange 44, a connection 18 for a pressure vessel 6 of a second expandable air blast unit 4 (not shown) can also be connected to the connection 12 of the expandable air blast unit 4, thus extending the expandable air blast unit 8 by a second expandable air blast unit 4. The second expandable air blast unit 4 can be identical to the expandable air blast unit 4 shown. After connecting two expandable air blast unit 4s, up to seven air blast units 4, 5 can be compactly connected. Due to the compatibility of the connections 12, 18, the air blast unit 8 can therefore be expanded in a variety of ways.

[0054] In particular, the dimensions (especially the diameter) of the connection 18 for the pressure vessel 6 and the connection 12 for the additional air blast unit body 4, 5, as well as the number of mountings 38 provided there for fastening elements, are coordinated with each other, as will be explained in more detail below. The connection 18 for the pressure vessel 6 is thus advantageously used to extend the air blast unit 8 by directly coupling two extendable air blast unit bodies 4.

[0055] Fig. 4 Figure 4 shows the expandable air blast device body 4 according to an embodiment of the invention. The expandable air blast device body 4 comprises a pressure chamber 3 with an air intake volume.

[0056] The expandable air blast device body 4 is suitable for use in an expandable air blast device 8, as in Fig. 1 - 3 depicted, to be used.

[0057] At the connections 12 for the further air blast device bodies 4, 5, eight receptacles 38 are preferably provided on the end face, but this is not a limiting feature of the invention, which may be equipped with internal threads for receiving screws.

[0058] On the remaining side of the cube, or in this case cuboid, is the connection 18 for the pressure vessel 6, which is designed as a pipe flange with a pipe stub 40 and an adjoining projection 42. The projection 42 has eight receptacles 38 for fastening elements. The connection 18 is compatible with the opposite connection 12, which is designed as a block flange.

[0059] Fig. 5 shows a sectional view through the air blast device body 4 with a piston assembly inserted therein and part of the control unit 30 connected to it.

[0060] The piston 22 is shown in its closed position and, in the drawing, is movably mounted to the left and right 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 4. 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.

[0061] In embodiments not shown, which are also included in the invention, the cover 32 and / or the piston guide 20 may have overflow openings that allow a pressure-conducting connection from the piston pre-chamber 24 to the pressure chamber 3.

[0062] Approximately at the level of the second axis B or third axis C (see Fig. 6 ) , which is not limiting to 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 blast device bodies and the air outlet opening 14 to allow the compressed air blast to pass through.

[0063] 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.

[0064] 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 to the 3 / 2-way valve assembly 34 via a feed channel 31 running through the cover 32.

[0065] 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 (see Fig. 6 ), which form two of the connections 12 for the further air blast device bodies 4, 5. In the illustrated embodiment, the first axis A and the second axis B form, by way of example, but preferably, a right-angled cross with each other.

[0066] In the illustrated embodiment, a third axis C passing through the connection 18 for the pressure vessel 6 and the third connection 12 for the further air blast device body 4, 5 is, by way of example but preferably, perpendicular to the first axis A and to the second axis B.

[0067] The expandable air blast device 8 is based on the principle that the medium stored in the pressure vessel 6, the pressure chambers 3 and, if applicable, in connecting pieces, in particular air or an inert gas, is suddenly blown out via the air outlet opening 14.

[0068] The air blast device body 4 is filled with compressed air via the pressure vessel 6. Likewise, the piston pre-chamber 24 is filled with pre-chamber air.

[0069] 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. 5 depicted.

[0070] In the illustrated embodiment, 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, it allows the piston pre-chamber 24 to be vented, i.e., the air outlet opening 14 to be 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.

[0071] When the 3 / 2-way valve is actuated, the piston pre-chamber 24 is vented. This causes the medium stored in the pressure chambers 3 and in any connecting pieces to act on the piston 22 and push the piston 22 against the cover 32. This allows the compressed air from inside the air blast device body 4 to escape suddenly through the air outlet opening 14.

[0072] After the air blast is released, the air blast device body 4 is refilled with compressed air via the external compressed air connection. Likewise, the piston pre-chamber 24 is refilled with pre-chamber air. The expandable air blast device 8 is then ready for use again.

[0073] Fig. 6 shows a perspective view of an expandable air blast device body 4 according to an embodiment of the invention. Fig. 7 shows a cross-sectional view of it.

[0074] The expandable air blast device body 4 is essentially cube-shaped.

[0075] 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.

[0076] The connections 12 for the further air blast device bodies 4, 5 advantageously, but not limitingly for the invention, have an identical diameter D2 in the illustrated embodiment. Two of the connections 12 for the further air blast device bodies 4, 5 are arranged opposite each other in alignment. The previously described receptacles 38 and the fastening means are located on the end faces.

[0077] 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 device bodies 4, 5 in the illustrated embodiment.

[0078] The diameter D5 of the connection 18 for the pressure vessel 6 is advantageously, but not limitingly, the same size as the diameter D2 of the connection 12 for the further air blast device body 4, 5, which is located opposite it, in the illustrated embodiment. It is evident that several expandable air blast device bodies 4 can thus be connected to one another and spaced apart by the length of the pipe stub 14 plus the flange width. BEZUGSZEICHEN

[0079] 3 Pressure chamber; 4 Expandable blaster body; 5 Non-expandable blaster body; 6 Pressure vessel; 8 Expandable blaster; 10 Control unit connection; 12 Connection for additional blaster body; 14 Air outlet opening; 15 Valve seat; 16 Connecting channel; 18 Pressure vessel connection; 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; 35 Filling assembly; 36 Mounting screw; 38 Mounting; 40 Pipe stub; 42 Cantilever; 44 Blind flange; 47 Pre-chamber air connection hose; A First axis; B Second axis; C Third axis; D1 Diameter of control unit connection; D2 Diameter of connection for additional air blast device body; D3 Diameter of air outlet opening; D4 Inner diameter of valve seat; D5 Diameter of connection for pressure vessel.

Claims

1. One-piece, expandable air blast device body (4) 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 (18) for a pressure vessel (6), 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 expandable air blast device body (4) also includes at least one, preferably three, connections (12) for further air blast device bodies (4, 5) to form a common pressure chamber.

2. One-piece, expandable air blast device body (4) according to claim 1, characterized by the fact thatthe expandable air blast body (4) is essentially cube-shaped or cuboid-shaped, wherein the connection (18) for the pressure vessel (6), the connection (10) for the control unit (30), the air outlet opening (14) and three connections (12) for further air blast bodies (4, 5) form the sides of the cube or cuboid.

3. One-piece, expandable air blast device body (4) according to one of the preceding claims, characterized by the fact that two of the connections (12) for the further air blast device bodies (4, 5) are arranged opposite each other in alignment.

4. One-piece, expandable air blast device body (4) according to one of the preceding claims, characterized by the fact thatAxes, which each connect - two of the connections (12) for the further air blast device bodies (4, 5), - one of the connections (12) for the further air blast device bodies (4, 5) and the connection (18) for the pressure vessel (6), and - the air outlet opening (14) and the connection (10) for the control unit (30) to each other, form a double cross, wherein the axes are preferably perpendicular to each other.

5. One-piece, expandable air blast device body (4) 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 further air blast device bodies (4, 5) and / or the air outlet opening (14) are designed as block flanges.

6. One-piece, expandable air blast device body (4) according to one of the preceding claims, characterized by the fact that the connection (18) for the pressure vessel (6) is designed as a pipe flange.

7. One-piece, expandable air blast device body (4) according to one of the preceding claims, characterized by the fact that a diameter (D2) of at least one connection (12) for a further air blast device body (4, 5) is similar in size, preferably the same size, as a diameter (D5) of the connection (18) for the pressure vessel (6), and that the connection (12) for the further air blast device body (4, 5) has receptacles (38) for fastening means which are designed to be compatible with corresponding receptacles (38) for fastening means of the connection (18) for the pressure vessel (6).

8. One-piece, expandable air blast device body (4) 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 the compressed air is formed by an inner diameter (D4) of the valve seat (15).

9. Expandable air blast device (8) comprising at least one expandable air blast device body (4) according to any of the preceding claims.

10. Expandable air blast device (8) according to claim 9, characterized by the fact that the expandable air blast device (4) comprises exactly one expandable air blast device body (4) and one to three non-expandable air blast device bodies (5), which are directly connected to the expandable air blast device body (4) at the connections (12) for further air blast device bodies (4, 5), in particular forming a common pressure chamber.

11. Expandable air blast device (8) comprising at least two expandable air blast device bodies (4) according to any one of claims 1 to 8, wherein a connection (12) for a further air blast device body (4, 5) of a first expandable air blast device body (4) is directly connected to the connection (18) for the pressure vessel (6) of a second air blast device body (4) forming a common pressure chamber.

12. Expandable air blast device (8) according to claim 11, characterized by the fact that the expandable air blast device (4) has several non-expandable air blast device bodies (5) which are directly connected to the expandable air blast device bodies (4) at the connections (12) for further air blast device bodies (4, 5) forming a common pressure chamber.

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