One-piece expandable air blast device body and expandable air blast device

Abstract

A one-piece, expandable air blast device body (4) having 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), characterized in that the expandable air blast device body (4) also comprises at least one, preferably three, connections (12) for further air blast device bodies (4, 5).

Description

The invention relates to an integrally formed expandable air-blast apparatus body according to the preamble of claim 1, and to an expandable air-blast apparatus.PRIOR ARTAir blast apparatus bodies are used in air blast apparatus designed to generate strong air blasts, particularly in application to loosen material encrustations from surfaces of a process room or to convey material in a process room.Air blast devices are based on the principle that a medium stored in a pressure chamber, for example air or inert gases, is abruptly blown off via a blowing-out opening. In this case, a compressed air blast is exerted abruptly under forced control via a valve unit, with the result that compressed air is blown abruptly from the air blast device to a blowing point, which is generally formed by a blowing nozzle, from where the compressed air then reaches the process space. The emerging air jet is preferably blown into the separating surface between a wall of the process space and the caking, since there are the lowest adhesive forces.Air blast devices are frequently used in process rooms in which high operating temperatures, for example up to 1200° C., prevail, wherein an aggressive chemical atmosphere generally also prevails in the interior of the process rooms. Such process spaces are also referred to as combustion chambers within the scope of the present invention. The blow-out nozzle consists of a heat-resistant cast material (hot-firing nozzle). The installation of a blow-out nozzle into existing wall openings is possible at any time and can in particular also be effected subsequently from the outside in a corresponding core drilling method. In plants with particularly high heat generation, long blow-out nozzles can be provided in order to protect the valve unit, in particular the piston assembly of the air blast device, from the action of heat.EP 1 528 013 A1 discloses an air blower with an internal valve unit arranged at the top, with a pressure container for storing gaseous medium under pressure, and a valve unit with a cylinder and a piston movable therein for the abrupt blowing out of a stored medium. The valve unit is arranged substantially within the pressure vessel. Such air blast devices are complicated to produce and limit the design variability and maintainability, since the valve unit and the blow-out tube in the pressure vessel are generally difficult to access.EP 2 272 776 A1 discloses an integrally formed air impact device body according to the preamble of claim 1. The air blast device body includes a pressure chamber surrounding a piston guide for receiving a piston and a valve seat for the piston. The body has a connecting flange for a control unit, which serves for venting a piston antechamber and thus for firing the compressed air via an air outlet flange.OBJECT OF THE INVENTIONThe object of the invention is to propose an air impact device body and an air impact device which can be produced cost-effectively, in particular while avoiding welding work. The air blast device should have a low complexity and be adaptable to different sizes of a process space. It is a further object of the invention to provide a particularly maintenance-friendly air blast device.DISCLOSURE OF THE INVENTIONThe object is achieved by an integrally formed, expandable air-blast device body having a pressure chamber which surrounds a piston guide for receiving a piston and a valve seat for the piston, a connection for a pressure container, a connection for a control unit for controlling the position of the piston, an air outlet opening and having at least one, preferably three, connections for further air-blast device bodies.The object is also achieved by an expandable air-blast device comprising at least one such expandable air-blast device body.The "integrally formed expandable air-jet device body" will be referred to as "expandable air-jet device body" hereinafter. The expandable air-blast device body is very compact due to the combination of the piston-valve assembly necessary for the operation of the air-blast device with connections for further air-blast device bodies and thereby reduces the volume of the air-blast device. Due to its distributor functionality, an air impact device having the expandable air impact device body can be expanded as well, adapted to different sizes of a process space and in particular also be used with a small amount of space available. By reducing individual parts and integrating a plurality of functionalities in a single component, the maintenance of the air blast device body is significantly improved.The expandable air impact device body according to the invention is manufactured in one piece by means of a casting method. This eliminates welding work for connecting parts to other air blast apparatus bodies. A disadvantage of welding is that the welds must be partially X-rayed to ensure their quality, which results in additional costs.The valve seat provided in the expandable air-blast device body defines a stop surface for the piston. The stop surface may be formed by an internal stop flange formed on the expandable air impact device body itself in one embodiment. Alternatively, the stop surface can be formed by an additional component, for example by a screw-in ring, press-in ring or cast-in ring. The abutment of the piston on the valve seat closes the air outlet opening.Preferably, since it is particularly compact and accessible, the expandable air-blast device body is substantially cubic or substantially cuboidal, wherein the connection for the pressure container, the connection for the control unit, the air outlet opening and three connections for further air-blast device bodies form the sides of the cube or cuboid.It has proven advantageous if the expandable air-blast device body has two connections for two further air-blast device bodies, which are arranged opposite one another in alignment.The air outlet opening and the connection for the control unit are preferably arranged opposite one another in alignment.The connection for the pressure vessel and a connection for one of the further air blast device bodies are preferably arranged opposite one another in alignment.According to an advantageous embodiment, it is provided that axes which respectively connect two connections or the air outlet opening and a connection for the control unit to one another form a double cross with one another and preferably stand perpendicular to one another.A first axle connects two of the connections for the further air blast device bodies. A second axle connects one of the connections for the further air blast device bodies and the connection for the pressure container. A third axle connects the air outlet opening and the connection for the control unit to one another.The connection of components to be connected, for example covers, pipes, pipe flanges, blind flanges, etc., to the connections and the air outlet opening can be effected in a form-fit and / or force-fit manner, by means of screw connection, clamping, external and / or internal threading, clamping, shrinkage, or the like, with or without additional fastening means, wherein reference can be made to the expert. The connections of the air blast device body can be designed accordingly in a variety of ways. They are preferably designed as connecting flanges.Although the invention is described in connection with screw connections, i.e. screws as fastening means, it is not limited thereto. The connection of the components can be effected in any desired manner, but preferably releasable connections, in particular screw connections, pin connections, or else a threaded connection, that is to say a direct screw connection of the component to be connected to the respective connection, for example connection flange. However, screw connections are preferred due to accessibility and serviceability.The symmetrical arrangement of the connections with respect to one another has several advantages. On the one hand, the body and thus the air blast device are equally easily accessible from all sides, which entails advantages in the maintenance and in the replacement of parts. On the other hand, the air blast device body is simple to calculate and model, so that the specific internal dimensions of the flow channels, the position of blind holes, ridges, edges and the like can be optimized in casting technology. An aim of the optimization can be to generate as few vortices as possible during the air surge in order to keep energy losses low.It has proven particularly advantageous if the connection for the control unit, the connections for further air impact device bodies and / or the air outlet opening are designed as block flanges, since this represents a particularly compact structural form of the body on the one hand and since the fastening means used for connecting the further components on the other hand are accessible from the outside. The block flanges are provided with receptacles for fastening means, preferably with four to twelve, in particular preferably eight receptacles for fastening means. Preferably, since it is easy to maintain, the receptacles for fastening means are designed as screw receptacles and have a corresponding internal thread. Blind holes can be provided in the block flanges as screw receptacles.As an alternative to the embodiment as a block flange, it can be provided that the flanges are designed as pipe flanges for providing the receptacles of fastening means.According to a preferred embodiment, the connection for the pressure vessel is designed as a pipe flange. The pipe flange comprises a pipe socket and an outwardly projecting protrusion for providing receptacles for fastening means. Advantageously, the expandable air blast device body is compatible with a pressure vessel having a block flange. Furthermore, it is possible to connect a plurality of expandable air blast device bodies to one another via the pipe flange and thus to expand the air blast device. For this purpose, the pipe socket can have a suitable length, for example from 5 cm to 30 cm, preferably from 10 cm to 15 cm. The expandable air impact device bodies are sufficiently spaced apart from one another via the pipe socket.In order to connect a plurality of 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 of similar size, preferably of 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 configured to be compatible with corresponding receptacles for fastening means of the connection for the pressure vessel.According to an advantageous embodiment, it is provided that a diameter of the connection for the control unit is of similar size, preferably of the same size, as a diameter of a connection for a further air blast device body. Furthermore, it is preferably provided that a diameter of a connection for a further air blast device body is of similar size, preferably of the same size, as a diameter of the air outlet opening. Alternatively or additionally, it is provided that a diameter of the connection for the control unit is of similar size, preferably of the same size, as a diameter of the air outlet opening.By "similarly large" is meant 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 connections makes it possible to use uniform components, for example valve covers, pipe flanges or blind flanges. In this sense, it is furthermore advantageous if the connections each have the same number of receiving openings for fastening means, wherein, due to possibly present different nominal pressures in the pressure chamber and in the piston prechamber, also between the connection for the control unit and the connection for further air blast device bodies, different numbers of receiving openings for fastening means can also be present.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.An expandable air-blast device comprises at least one of the expandable air-blast device bodies described. The expandable air impact device preferably has a plurality of air impact device bodies which are coupled to one another directly and / or with the aid of connecting pieces, forming a common pressure chamber. The further air blast device bodies may also be expandable air blast device bodies or non-expandable air blast device bodies.For the purposes of the present disclosure, "nonexpandable air-impact device bodies" are referred to as air-impact device bodies which have a connection to an external pressure source and generally, but not restrictive to the invention, usually in the form of a T-piece, the valve-piston assembly having the air outlet opening extending perpendicularly therefrom. A large number of embodiments are known to the person skilled in the art, for example from EP 2 272 776 A1.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 thereto one to three nonexpandable air-blast device bodies which are directly connected to the expandable air-blast device body at the connections for further air-blast device bodies.The invention is not limited to any particular number of air blast apparatus bodies in the air blast apparatus, since the air blast apparatus is expandable.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.The expandable air-blast device can have a plurality of nonexpandable air-blast device bodies which are directly connected to the expandable air-blast device bodies at the connections for further air-blast device bodies.In this case, up to three nonexpandable air-impact device bodies can be added in each case per expandable air-impact device body in the expandable air-impact device.Generally, the volume of the pressure chamber of the air impact device is composed of the volume of the pressure vessel, the volume of the pressure chambers of the air impact device bodies and, if present, the volume of connectors.Generally, each air blast device body, expandable or non-expandable, includes a piston inserted in the piston guide and an associated control unit. The expandable air blast device may further comprise any valve caps or blind flanges attached to the ports.The expandable air blast device comprises at least one connected pressure vessel which has a volume of preferably 10 to 500 l, preferably 50 to 150 l. The pressure vessel can be connected directly to the corresponding connection of the expandable air blast device body via a connection flange. Alternatively, the expandable air-blast apparatus can also be used without a pressure vessel if the volume of the combined pressure chambers of the air-blast apparatus bodies is sufficient.For example, for space reasons, it may be necessary for two air blast device bodies, e.g., two expandable air blast device bodies, or one expandable air blast device body and one non-expandable air blast device body, to be connected to one another via connectors, such as pipes.It is preferably provided that the expandable air blast device bodies are preferably each individually connected to control units via their connections, wherein the control units are preferably connected to one another via connecting hoses. Suitable hoses are, for example, 1 / 2 inch hoses. The piston prechamber is filled via the control unit.Although the invention is described in the context of "air" impacts, it is not limited thereto. As media, other gases can be expediently used as an alternative to ambient air, in particular inert gases, depending on the application.Although the invention is described in connection with a 3 / 2-way valve, it is not limited thereto. It is likewise possible to use other mechanisms which cause the piston to be brought abruptly from the valve seat into an open position and to be returned from the open position back into the closed position, in particular using, for example, 2 / 2-way valves or quick-release valves and a spring in the piston antechamber.BRIEF DESCRIPTION OF THE DRAWINGSThe invention is described and illustrated in more detail below with reference to the figures.The following are shown: FIG. 1 is a perspective view of an expandable air blast apparatus according to an embodiment of the invention, FIG. 2 is a side view of the expandable air blast apparatus of FIG. 1, FIG. 3 is a front view of the expandable air blast apparatus of FIG. 1, FIG. 4 is a perspective view of an expandable air blast apparatus body according to an embodiment of the invention with a control unit connected, FIG. 5 is a sectional view through the expandable air blast device body of FIG. 4, FIG. 6 is a perspective view of an expandable air blast apparatus body according to an embodiment of the invention; and FIG. 7 is a sectional view through the air blower body of FIG. 6.EMBODIMENTS OF THE INVENTIONFIG. 1 is a perspective view of an expandable air blast apparatus 8 according to an embodiment of the invention. FIGS. 2 and 3 show a side view and a front view of the expandable air blast device 8.The expandable air-blast device 8 comprises an expandable air-blast device body 4 and, by way of example, two nonexpandable air-blast device bodies 5 connected thereto, which can be configured in a known manner with respect to the position of their connections in a T-shape, with compressed air connection and piston / control unit, for example as known from EP 2 272 776 A1, FIG. 1 therein.A pressure vessel 6 is connected to a connection 18 designed as a pipe flange on the expandable air blast device body 4. The two non-expandable air-blast device bodies 5 are connected to opposite sides of the expandable air-blast device body 4. A control unit 30 is connected to the expandable air-blast device body 4 on the front side. Also, the non-expandable air-blast apparatus bodies 5 are provided with control units 30.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 designed as a block flange by way of example, but preferably cylindrically, and the air outlet opening 14.The control unit 30 comprises a cover 32 which has a central bore as feed duct 31 for prechamber air (see e.g. FIG. 5 ). The cover 32 is fixed to the connector 10 for the control unit 30 by means of, for example but not limiting to the invention, eight fixing screws 36 which engage in corresponding blind holes (not shown). In the exemplary embodiment shown, the control unit comprises, by way of example, but not limitation, for the invention, a 3 / 2-way valve assembly 34.The control units 30 are connected to each other by means of connecting hoses 47 for the pre-chamber air. The connecting hoses 47 are expediently designed, for example as 1 / 2 inch hoses, depending on the required pressure and tightness requirements. As can be seen in FIG. 4, the connecting hoses 47 are joined together at a filling fitting 35. The filling assembly 35 is known per se and is not the subject matter of the present invention, so that a detailed description is not required.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 by a blind flange 44.Instead of the blind flange 44, a further air blast device body 5 (not shown), i.e. a third, nonexpandable air blast device body in the case shown, can be connected via the connection 12. The third non-expandable air-blast device body 5 is, for example, identical to the other two illustrated non-expandable air-blast device bodies 5.Instead of the blind flange 44, however, a connection 18 for a pressure vessel 6 of a second expandable air-blast device body 4 (not shown) can also be connected to the connection 12 of the expandable air-blast device body 4, which expands the expandable air-blast device 8 by a second expandable air-blast device body 4. The second expandable air-blast device body 4 can be designed identically to the illustrated expandable air-blast device body 4. After the connection of two expandable air-blast device bodies 4, up to seven air-blast device bodies 4, 5 can already be provided in a compactly connected manner. Due to the compatibility of the connections 12, 18, the air blast device 8 can thus be expanded in a variety of ways.In particular, the dimensioning (in particular diameter) of the connection 18 for the pressure vessel 6 and of the connection 12 for the further air blast device body 4, 5 and the number of receptacles 38 for fastening means provided there are matched to one another, as will be explained in more detail below. The connection 18 for the pressure vessel 6 is thus advantageously used for expanding the air blast device 8 with direct coupling of two expandable air blast device bodies 4.FIG. 4 shows the expandable air blast device body 4 according to an embodiment of the invention. The expandable air-blast apparatus body 4 comprises a pressure chamber 3 having an air-receiving volume.The expandable air-blast device body 4 is suitable for use in an expandable air-blast device 8, as shown in Figs. 1-3.At the connections 12 for the further air blast device bodies 4, 5, eight receptacles 38 are provided in each case, which are preferred at the end face, but are not restrictive for the invention, and can be equipped with internal thread turns for receiving screws.On the remaining side of the cube or in this case cuboid, there is the connection 18 for the pressure vessel 6, which is designed as a pipe flange with a pipe socket 40 and a protrusion 42 adjoining it. On the protrusion 42, eight receptacles 38 for fastening means are again provided. The terminal 18 is compatible with the opposing terminal 12 formed as a block flange.FIG. 5 shows a sectional view through the air blast device body 4 with a piston assembly inserted therein and a part of the control unit 30 connected thereto.The piston 22 is shown in its closed position and is mounted in a tubular piston guide 20 so as to be movable to the left and right in the drawing. The piston guide 20 is formed by a pipe socket which extends into the interior of the pressure chamber 3 of the air-blast device body 4. As illustrated, a tube section can be inserted into the piston guide 20, which is in direct contact with the piston 22. This is not the subject matter of the invention, so that a more detailed description can be omitted.In embodiments which are not shown and 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 prechamber 24 into the pressure chamber 3.Approximately at the level of the second axis B or third axis C (see FIG. 6 ), which is not restrictive 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 impact device bodies and the air outlet opening 14 in order to pass through the compressed air impact.In the embodiment shown, the piston 22 is formed, not restrictive for the invention, from a central disk 26 and a piston disk 27 adjoining it, which together with here, by way of example, two heat protection disks 28 are connected by means of a connecting screw 21 to form a clamping packet.Between the piston 22 and the cover 32 of the control unit 30, a piston prechamber 24 is formed. The piston prechamber 24 is connected to the 3 / 2-way valve assembly 34 via a feed duct 31 running through the cover 32.The connection 10 for the control unit 30 and the air outlet opening 14 connect a first axis A. A second axis B extends 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 with one another. The first axis A and the second axis B form, by way of example, but preferably, a rectangular cross with one another in the embodiment shown.A third axis C, which runs through the connection 18 for the pressure vessel 6 and the third connection 12 for the further air blast device body 4, 5, is, in the embodiment shown, by way of example but preferably, perpendicular to the first axis A and to the second axis B.The expandable air impact device 8 is based on the principle that the medium, in particular air or an inert gas, stored in the pressure vessel 6, the pressure chambers 3 and optionally in connecting pieces is abruptly blown off via the air outlet opening 14.The air blast apparatus body 4 is filled with compressed air via the pressure vessel 6. The piston prechamber 24 is likewise filled with prechamber air.The pressure of the prechamber air in the piston prechamber 24 leads to the piston 22 being pressed against the valve seat 15 provided on the air outlet opening 14. As a result, the air outlet opening 14 is closed, as shown in FIG. 5.In the exemplary embodiment shown, the blowing-out process is controlled by the 3 / 2-way valve assembly 34. the 3 / 2-way valve assembly 34 enables the closing of the air outlet opening 14 in one position by the piston 22 resting in the valve seat 15, and in the other position the venting of the piston prechamber 24, i.e. the opening of the air outlet opening 14, which triggers an abrupt return movement of the piston 22 and a stop against a damping ring 25 and thus the generation of the air surge by discharging the pressure from the pressure chamber 3.When the 3 / 2-way valve is actuated, the piston prechamber 24 vents, as a result of which the medium stored in the pressure chambers 3 and in the connecting pieces which may be provided acts on the piston 22 and pushes the piston 22 against the cover 32, and as a result the compressed air can escape from the interior of the air-blast device body 4 abruptly via the air outlet opening 14.After the delivery of the air blast, the air blast device body 4 is again filled with compressed air via the external compressed air connection. Likewise, the piston prechamber 24 is filled again with prechamber air. The expandable air blast device 8 is again ready for use.FIG. 6 is a perspective view of an expandable air blast apparatus body 4 according to an embodiment of the invention. FIG. 7 is a sectional view thereof.The expandable air-blast apparatus body 4 is substantially cubic in shape.D 4 denotes an inner diameter of the valve seat 15. In the pressure chamber 3, the inner diameter D 4 of the valve seat 15 is the smallest flow cross section for discharging the compressed air. In particular, the surface cross section of the valve seat 15 is smaller than the surface cross section in the region of the connecting channel 16.The connections 12 for the further air blast device bodies 4, 5 have an identical diameter D 2 in the embodiment shown, but not limiting to the invention. Two of the connections 12 for the further air blast device bodies 4, 5 are arranged opposite one another in alignment. On the end faces, the already described receptacles 38 are the fastening means.In the embodiment shown, the diameter D 3 of the air outlet opening 14 is advantageously, but not restrictive to the invention, as large as the diameter D 1 of the connection 10 for the control unit 30 and as large as the diameters D 2 of the connections 12 for the further air blast device bodies 4, 5.The diameter D 5 of the connection 18 for the pressure vessel 6 is advantageous in the embodiment shown, but not restrictive for the invention, as large as the diameter D 2 of the connection 12 for the further air blast device body 4, 5 which lies opposite it. It can be seen that in this way a plurality of expandable air impact device bodies 4 can be placed against one another and are spaced apart from one another by the length of the pipe socket 14 plus the flange width.REFERENCE NUMERALS3 Pressure chamber; 4 expandable air-blast device body; 5 nonexpandable air-blast device body; 6 pressure vessel; 8 expandable air-blast device; 10 connection control unit; 12 connection of further air-blast device body; 14 air outlet opening; 15 valve seat; 16 connecting duct; 18 connection pressure vessel; 20 piston guide; 21 connecting screw; 22 piston; 24 piston prechamber; 25 damping ring; 26 middle disk; 27 piston disk; 28 heat protection disk; 30 control unit; 31 supply duct prechamber air; 32 cover; 34 3 / 2-way valve assembly; 35 filling fitting; 36 fastening screw; 38 receptacle; 40 pipe socket; 42 protrusion; 44 blind flange; 47 connecting hose prechamber air;A first axis; B second axis; C third axis; D 1 diameter connection control unit; D 2 diameter connection further air blast device body; D 3 diameter air outlet opening; D 4 inner diameter valve seat; D 5 diameter connection pressure container.References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedEP 1 528 013 A1

[0005] EP 2 272 776 A1 [0006, 0030, 0046]

Claims

Integrally formed, expandable air-blast device body (4) 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 (18) for a pressure vessel (6), a connection (10) for a control unit (30) for controlling the position of the piston (22) and having an air outlet opening (14), characterized in that the expandable air-blast device body (4) additionally comprises at least one, preferably three, connections (12) for further air-blast device bodies (4, 5).Integrally formed, expandable air-blast device body (4) according to Claim 1, characterized in that the expandable air-blast device body (4) is of substantially cubical or cuboidal design, 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 device bodies (4, 5) form the sides of the cube or cuboid.Integrally formed, expandable air-blast device body (4) according to one of the preceding claims, characterized in that two of the connections (12) for the further air-blast device bodies (4, 5) are arranged opposite one another in alignment.Integrally formed, expandable air-blast device body (4) according to one of the preceding claims, characterized in that axles which respectively 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 one another form a double cross, wherein the axles are preferably perpendicular to one another.Integrally formed, expandable air-blast device body (4) according to one of the preceding claims, characterized in 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 formed as block flanges.Integrally formed, expandable air blast device body (4) according to one of the preceding claims, characterized in that the connection (18) for the pressure vessel (6) is formed as a pipe flange.Integrally formed, expandable air-blast device body (4) according to one of the preceding claims, characterized in that a diameter (D 2) of at least one connection (12) for a further air-blast device body (4, 5) is of similar size, preferably of the same size, as a diameter (D 5) of the connection (18) for the pressure vessel (6), and in that the connection (12) for the further air-blast device body (4, 5) has receptacles (38) for fastening means which are formed in a compatible manner with corresponding receptacles (38) for fastening means of the connection (18) for the pressure vessel (6).Integrally formed expandable air-blast device body (4) according to one of the preceding claims, characterized in that a smallest flow cross section for the discharge of the compressed air is formed in the pressure chamber (3) by an inner diameter (D 4) of the valve seat (15).An expandable air-blast device (8) comprising at least one expandable air-blast device body (4) according to any of the preceding claims.Expandable air-blast device (8) according to claim 9, characterised in 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).Expandable air-blast device (8) comprising at least two expandable air-blast device bodies (4) according to 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).Expandable air-blast device (8) according to claim 11, characterised in that the expandable air-blast device (4) comprises a plurality of 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).

Images