Device for adjusting an air volume flow

Abstract

A device for adjusting an air volume flow, particularly in an air distribution network, comprises a central air duct and a throttle arranged in the central air duct. The size of the cross-sectional area of ​​the air duct can be changed by means of the throttle (6), which includes an adjustment mechanism for changing the cross-sectional area. In addition to the throttle (6), the device has a central flow element (3) arranged in the air duct, which has a sheath (30) whose circumference increases in the direction away from the throttle (6). The adjustment mechanism (4, 612) can be actuated when the device is mounted in a wall opening (10). This allows for optimal fine adjustment of the device.

Description

TECHNICAL AREA

[0001] The present invention relates to a device for adjusting an air volume flow, in particular a supply air valve and / or an exhaust air valve. STATE OF THE ART

[0002] Air distribution networks are used in buildings primarily for ventilation and, in some cases, for air conditioning. Controlled residential and office ventilation systems are now sophisticated systems that utilize central or decentralized ventilation units.

[0003] The wall, ceiling, or floor openings of a building contain air diffusers with inserts connected to the air distribution network. These diffusers modify the shape of the airflow and / or regulate the air volume flow. Depending on the direction of airflow into or out of the room, they are referred to as supply air valves or exhaust air valves. They limit the cross-section in the air duct, and the size of this limitation can be selected using throttles.

[0004] Unfortunately, these types of supply and exhaust air valves are often difficult or impossible to adjust once installed. Another disadvantage is that, depending on the valve's setting, individual components protrude into the room to varying degrees, protruding from the building wall and negatively impacting the room's appearance.

[0005] Supply air valves, i.e., valves through which air flows into a room, often have the disadvantage of not distributing the outgoing air evenly. A person sitting or lying down and directly exposed to the outgoing air may find this unpleasant. Furthermore, this results in streaks of dirt deposits, which are more visible than a uniform distribution. An uneven airflow also leads to increased noise.

[0006] Another disadvantage is that exhaust air vents, i.e., vents through which air flows out of a room, often have a different shape than supply air vents. This results in a rather uneven appearance in the room.

[0007] WO 2022 / 101056 A1 discloses an air volume throttle valve with air guide elements in the form of rotor blades. The air guide elements are each formed from a first and a second air guide unit, which can be rotated relative to each other, so that the distance between the air guide elements and thus the cross-sectional area through which air can flow is variable. This device allows the free flow cross-section to be changed while keeping the location of the narrowest flow cross-section constant. This facilitates the control of the valve.

[0008] US 2,627,799 discloses an air intake valve with a throttle having a rectangular frame that is pivotable about an axis. L-shaped air guide vanes are arranged in a row. The air guide vanes are pivotable about an axis perpendicular to the direction of airflow. Downstream of the throttle in the direction of airflow is an air guide element and a unit comprising adjustment means and assembly aids.

[0009] US 3,592,240 A shows an air intake valve with a throttle and an air guide. The throttle's locking elements are two semicircular flaps, each pivotable about its own axis. The axes are perpendicular to the longitudinal center axis.

[0010] KR 200 372 251 Y reveals a throttle with several rotor blades rotatable around a common central axis.

[0011] CN 113 834 139 A shows a throttle with flower-like pivoting locking elements, wherein each locking element is pivotable about its own axis and wherein the individual axes are arranged in a circle.

[0012] US 3,221,634 describes a fresh air vent with a fan and a throttle located upstream of the fan, thus facing the room. The throttle has an inner stationary disc and an outer, i.e., downstream, rotatable disc. The outer disc is adjustable by means of a chain drive attached to the outside of the outer disc. PRESENTATION OF THE INVENTION

[0013] One of the aims of the invention is to enable optimized adjustability of the volume flow.

[0014] This problem is solved by a device having the features of claim 1.

[0015] The device according to the invention for adjusting an air volume flow, particularly in an air distribution network, comprises a flowable air duct and a throttle arranged in the air duct. The size of the flowable cross-section of the air duct can be changed by means of the throttle. The throttle has an adjustment mechanism for changing the flowable cross-section. In addition to the throttle, the device has a flow element arranged in the air duct, which has a sheath whose circumference increases in the direction away from the throttle. The adjustment mechanism can be actuated when the device is mounted in a wall opening.

[0016] The air duct is preferably a central air duct and the flow element is preferably a central flow element.

[0017] The adjustment mechanism preferably allows for manual or exclusively manual adjustment of the throttle setting. The individual positions are preferably held in place, e.g., by means of a detent mechanism.

[0018] Since the throttle is adjustable when the valve is installed, it is possible to check during the adjustment whether the desired air volume flow is obtained and whether the acoustic behavior of the valve is acceptable for living comfort.

[0019] The flow element is preferably located on the side of the throttle facing the interior of the building when the device is assembled; that is, in the case of an air supply valve, it is positioned downstream of the throttle. The flow element ensures optimal airflow distribution within the building.

[0020] In one embodiment, the flow element can be removed and reinstalled in the device mounted in the wall opening to allow access to the adjustment mechanism. Preferably, the flow element can be detachably attached to the rest of the device without tools, for example by means of a snap fastener or a bayonet fitting.

[0021] Alternatively or additionally, the flow element has a through-opening that allows access to the adjustment mechanism. This has the advantage that the flow element does not need to be disassembled.

[0022] In one embodiment, the through-opening is centrally located. This is optimal for centrally mounted throttle discs or throttle bodies. In other embodiments, it is arranged off-center in the casing of the flow element. This is particularly suitable for off-center mounted throttle discs or throttle bodies.

[0023] The flow element is preferably open on the side facing away from the throttle. This opening is preferably closed by means of a cover. The cover is preferably tool-free for mounting and dismounting to provide access to the through-hole and / or the adjustment mechanism. Preferably, the cover is held on the flow element by magnets. It can also be detachably attached to the flow element, for example, by means of clamping or snap-in elements. The cover optimizes the appearance of the valve in the building interior. Furthermore, the cavity closed by the cover can be used for the installation of additional elements, such as sensors or actuators.

[0024] According to the invention, the throttle comprises at least a first throttle section with first blocking elements and a second throttle section with second blocking elements. The position of the second blocking elements relative to the first blocking elements is variable in order to change the size of the cross-sectional area through which the flow can pass. Preferably, the outer surface of the flow element is spaced apart in the flow direction from the first blocking elements and / or the second blocking elements.

[0025] In preferred embodiments, the second throttle part is mounted in a guided manner around its circumference. This allows for fine adjustment of the throttle, particularly when the adjustment means is arranged off-center, especially on the circumference of the second throttle part. Preferably, the second throttle part is rotatably designed, with the adjustment means arranged off-center.

[0026] The fine adjustment is also optimized if the second throttle part is centrally mounted, but the adjustment means is arranged decentrally, in particular, on the circumference of the second throttle part.

[0027] In preferred embodiments, the second throttle section is unguided and bearingless in its central area. This allows for the formation of an enlarged flow-through cross-section of the throttle and prevents pointed gap openings with undesirable acoustic behavior.

[0028] The adjusting device can be designed in various ways. Preferably, it has teeth and a gear meshing with those teeth. The gear is preferably the head of a pivot pin, and the teeth are preferably arranged on the second throttle part. Other gear mechanisms can also be used.

[0029] If a rotary pin is used, it preferably has a pin that can be made contact through the through-hole of the flow element in order to rotate the gear along the teeth by turning the pin. Alternatively, it can protrude through the through-hole.

[0030] Preferably, the pin has a receiving opening for receiving a tool.

[0031] Alternatively or additionally, the pin preferably has an outer surface for grippy contact using a tool and / or by hand, for example a knurled surface.

[0032] The casing of the flow element is preferably closed at the top, except for the through-opening. This directs the airflow from the throttle along the flow body to the outside, preventing it from penetrating the body.

[0033] The flow element is preferably formed in one piece. The same applies to the first and second throttle sections and, if present, to a third throttle section. The third throttle section is preferably part of a valve housing on or in which the other throttle sections and the flow element are arranged.

[0034] The flow element preferably has a bell-shaped form with a cross-section that widens away from the throttle and a casing that is curved inwards. This shape optimizes a homogeneous outflow of the air volume flow.

[0035] Preferably, the flow element has a flow edge curved towards the throttle at its end furthest from the throttle. This also optimizes the outflow characteristics of the air volume flow.

[0036] If the casing is spaced away from the first and second throttle parts and, if present, from the third throttle part, a constant air volume flow can be achieved downstream of the throttle, and the optical appearance of the device inside the building does not change when the throttle setting is changed.

[0037] Preferably, the device for adjusting an air volume flow, particularly in an air distribution network, includes a flow-through air duct. The air duct defines a longitudinal center axis and radial directions. The device has a throttle arranged in the air duct, the throttle comprising at least a first throttle section with first blocking elements and a second throttle section with second blocking elements. The position of the second blocking elements relative to the first blocking elements is variable to change the size of the flow-through cross-section in the air duct. In a first end position of the second blocking elements relative to the first blocking elements, a minimum size of the flow-through cross-section is achieved, and in a second end position, a maximum size of the flow-through cross-section is achieved.Preferably, the first blocking elements and the second blocking elements are designed such that they form a part of the flowable cross-section in approximately all positions between the first end position and the second end position in approximately every radial direction, wherein the flowable cross-section is widened towards the longitudinal center axis in at least some of the positions between the first and second end positions.

[0038] Preferably, therefore, flowable cross-sections are present in almost every radial direction in virtually every throttle setting. This contrasts with known blocking elements with a circular sector-shaped wing, which do not allow flowable areas within the blocking circular sector.

[0039] This altered distribution of the flowable cross-sectional areas, compared to the prior art, homogenizes the outflow behavior. This distribution can be achieved, for example, by distorting the shapes of known blocking elements, especially throttle vanes. For instance, the familiar circular sector shape can be bent until a curved shape is created. This is demonstrated in the Figures 14 and 15 Recognizable. However, other types of distortion are also possible. For example, by inserting lateral recesses and / or through holes into the locking elements.

[0040] Since the flow-through cross-section widens towards the longitudinal center axis, small outflow angles are avoided. Because this prevents gap flows from forming, the acoustic behavior is improved. Noise levels are minimized. The flow-through cross-section typically ends at a distance from the longitudinal center axis.

[0041] This widening of the flowable cross-section can be continuous or stepwise from the outer circumference of the throttle towards the longitudinal center axis. Preferably, however, this only applies to an inner region. This means that radially outward narrowings in the flowable cross-section are also possible. Preferably, in at least some of the positions between the first and second end positions, the flowable cross-section is first narrowed and then widened towards the longitudinal center axis.

[0042] Preferably, the flowable cross-section forms several L-shaped areas, subdivided by the first and second blocking elements, in at least some of the positions between the first and second end positions. The shorter legs of the L-shaped areas preferably form the extended flowable area near the longitudinal center axis.

[0043] This L-shape allows for optimal flow characteristics thanks to the avoidance of small angles. Furthermore, it is easy to implement.

[0044] At least the long leg of the L-shaped section is preferably curved. In some embodiments, the transition between the long and short legs of the L-shaped section is rounded.

[0045] The positions of the blocking elements can preferably be changed when the device is mounted in a wall opening. This makes it easier to adjust the airflow to the desired level of comfort.

[0046] Depending on the design, the locking elements can be moved by a motor, for example according to sensor values ​​and / or by remotely triggering the motor. Preferably, however, they are manually adjustable.

[0047] The first and second locking elements can be designed differently. Preferably, they can be rotated or at least pivoted relative to each other. Preferably, they are wings that are curved in the radial directions.

[0048] The first locking elements are preferably wings extending from the longitudinal center axis to free ends. These ends are alternatively connected to an outer circumferential ring. Preferably, the first locking elements terminate in a common area in the region of the longitudinal center axis, here referred to as the central locking middle section.

[0049] The second locking elements are preferably wings extending from a common outer circumferential ring towards the longitudinal center axis, but ending freely at a distance from the longitudinal center axis. They thus form free ends in the region of the longitudinal center axis.

[0050] The enlarged portion of the flowable cross-section can be achieved in various ways by appropriately designing the first and / or second blocking elements. In preferred embodiments, the free ends of the second blocking elements are arranged around a central free area, the cross-section of which is larger than the cross-section of the central blocking section. This creates a free annular area that is only partially covered by the first blocking elements. This area, uniformly distributed around an inner circumference, prevents gap flow and optimizes homogeneous outflow.

[0051] The second locking elements are preferably flat. This facilitates relative position changes, for example, rotating the second throttle part.

[0052] In preferred embodiments, the second locking elements are part of a throttle disc or throttle body that is rotatably mounted on its circumference. This allows it to be designed with a central opening, thus enabling the extended area to be achieved in a simple manner.

[0053] The flow behavior can be further optimized, in particular pressure losses can be minimized, if the first barrier elements form curved inflow surfaces.

[0054] In simple embodiments, the throttle is formed by the first and second throttle sections. In other embodiments, the device has a third throttle section with third locking elements, which are arranged congruently with the first locking elements. The second locking elements are arranged between the first and third locking elements and are movable relative to them. This allows for further improvements in flow characteristics. Furthermore, these embodiments can be optimally used as supply and exhaust air valves, i.e., for both flow directions in an air distribution network.

[0055] If the third barrier elements form curved outflow surfaces, the flow behavior is optimized and, in particular, pressure losses are minimized.

[0056] In preferred embodiments, the first and, if present, the third throttle part are rotationally fixed, and the second throttle part is rotatable about the longitudinal central axis. In other embodiments, other parts of this throttle are either rotationally fixed or rotatable.

[0057] Installation in wall openings can be facilitated if the device has a housing designed for insertion into a wall opening, in particular for clamping and / or sealing. Preferably, a corresponding sealing and / or clamping ring is arranged on the circumference of the housing.

[0058] In preferred embodiments, an internal flow element is also provided. It has a sheath that is spaced apart from the first and second throttle sections and, if present, from the third throttle section. The sheath has a circumference that increases in the direction away from the throttle. This separation of the internal flow element and the throttle allows the throttle to be adjusted without altering the visual appearance of the supply or exhaust air valve in the room. The lowest part of the valve always extends the same distance into the room. This allows the valves to be adjusted differently with respect to the airflow volume, while still maintaining a uniform appearance in the room. The flow element is preferably bell-shaped.If the air duct between the bottom of the throttle and the outer surface of the flow element is preferably mostly curved and leads into the room approximately parallel to a cover surface, the flow behavior is further improved.

[0059] Preferably, the internal flow element allows access to the throttle adjustment mechanism even when the device is assembled. This access can be closed, for example, with a removable and re-mountable cover.

[0060] Alternatively, the flow element can be easily removed to provide access to the throttle's adjustment mechanism. Preferably, it can be attached to the housing or throttle using a snap-on or bayonet fitting.

[0061] Preferably, the position of the flow element relative to the housing or relative to the wall surface does not change when the throttle setting is changed. Likewise, the cross-section of the outlet channel or the outlet opening of the air duct preferably does not change when the throttle setting is changed. Further embodiments are specified in the dependent claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Preferred embodiments of the invention are described below with reference to the drawings, which serve only for illustration and are not to be interpreted restrictively. The drawings show: Figure 1 shows a longitudinal section through a device according to the invention, installed in a wall opening; Figure 2 shows an exploded view of the device according to the invention. Figure 1 from above; Figure 3 a first exploded view of the device according to Figure 1from below; Figure 4 a second exploded view of the device according to Figure 1 from below; Figure 5 a perspective view of the device according to Figure 1 from above in the partially closed position of the throttle; Figure 6 a perspective view of the device according to Figure 5 in a fully open position of the throttle. Figure 7 shows a perspective view of the device without the flow element and cover. Figure 1 from below; Figure 8 a perspective view of the device without a lid according to Figure 1 from below, Figure 9 a view of the device according to Figure 1 from above in the partially closed position of the throttle; Figure 10 a view of the device according to Figure 9from above in the fully open position of the throttle. Figure 11 a view of the second throttle part from above, Figure 12 a view of the second throttle part from below; Figure 13 a perspective view of the second throttle part; Figure 14 a schematic representation of a conventional throttle; Figure 15 a schematic representation of a throttle according to the invention and Figure 16 a graphical representation of the distribution of the blocking area over the circumferences and radii of the throttles according to the Figures 14 and 15 .

[0063] Identical parts are marked with the same reference number. DESCRIPTION OF PREFERRED EXECUTION FORMS

[0064] Figure 1Figure 1 shows a valve V according to the invention, which is installed in a wall opening 10 of a wall 11. The wall opening 10 is preferably part of an air distribution network of a building. The terms "bottom" and "top" used in this text refer to the installation position of the valve in the wall opening of a building ceiling. If the wall opening is located in a different wall of a building, these terms should be interpreted accordingly.

[0065] The valve V is an exhaust air valve that directs air from a building room into the wall opening 10, or it is a supply air valve that directs air from the air distribution network through the wall opening into the building room.

[0066] The valve V is described below as an air supply valve, although it is identical in its function as an exhaust air valve.

[0067] The valve V, as shown in the Figures 2 to 4It is clearly recognizable that there is a housing 2, an inner flow element 3, a pivot pin 4, a cover 5 and a throttle 6.

[0068] The housing 2 is preferably designed in two parts. It preferably has a round cross-section. A first housing part 20 has a hollow, circular cylindrical base body 200, the lowermost end of which forms a radially outwardly projecting flange 201. The valve V rests against the building wall 11 with this flange 201, as shown in Figure 1 The first flange 201 is preferably rigid and serves as a stop when the valve V is inserted into the wall opening 10, as shown in Figure 1 It is recognizable. It forms a finish to cover irregularities in the surrounding wall 11.

[0069] The base body 200 has a first step 202 and a second step 203 on its outer circumference. A circumferential upper end face 204 is preferably planar. The upper end face 204 has a recess 205 for the passage of the pivot pin 4.

[0070] In the upper area of ​​the first housing part 20 a third throttle part 22 is formed, which is described further below in the text together with a first and a second throttle part 60, 61 of the throttle 6.

[0071] A second housing part 21 has a narrow, hollow cylindrical or annular base body 210. It is surrounded by a radially projecting second flange 211. The second flange 211 is preferably designed as a flexible sealing and / or clamping ring. It serves to seal and detachably fasten the valve V in the wall opening 10, as shown in Figure 1The wall opening 10 preferably has a round cross-section for this purpose. The second flange 211 can be injection-molded, integrally formed, or connected to the second base body 210 in another way.

[0072] The second housing part 21 surrounds the upper area of ​​the first housing part 20. It rests on the first stage 202 and preferably extends to the second stage 203.

[0073] The housing 2 encloses a central air duct that defines a longitudinal center axis L and radial directions.

[0074] The inner flow element 3 is arranged in housing 2, extending downwards towards the interior of the building, as shown in Figure 1The inner flow element 3 is preferably hollow and can be closed at the bottom with the cover 5. The flow element 3 is closed at the top except for a through-opening 33 for the passage of the pivot pin 4.

[0075] The flow element 3 is preferably essentially rotationally symmetrical. It has a bell-shaped form, with a downwardly widening cross-section and an inwardly curved shell 30. The flow element 3 preferably extends to the outer edge of the first flange 201 or beyond.

[0076] The flow element 3 is fixedly held in the first housing part 20, preferably with a bayonet fitting or with another releasable and re-establishable connection. These coupling elements are preferably arranged in the region of the longitudinal center axis L. Figure 2A second coupling element 220 of the first housing part 20 and a corresponding coupling element 34 of the flow element 3 are clearly visible. It is a plug-and-turn connection in the form of a bayonet fitting.

[0077] As in Figure 1 As can be seen, a flow channel, referred to here as air channel 8, is formed between the first housing part 20 and the flow element 3. It leads from the wall opening 10 through the throttle 6 and through the annular gap between the first flange 201 and the casing 30 of the flow element 3 into the building interior. The gap is usually always the same size, regardless of the adjustability of the throttle 6 described below. The outflow cross-section of the valve V thus remains the same even when the setting of the throttle 6 is changed, and therefore when the cross-section through which the flow passes through the throttle 6 changes.

[0078] An upwardly curved outflow edge 31 of the flow element 3, together with the also upwardly inclined first flange 201, optimizes the outflow behavior, as shown in Figure 1 is recognizable.

[0079] The flow element 3 has a circumferential annular rim that forms a flat lower end face 32 against which the cover 5 rests. The annular rim surrounds an inlet opening that leads into a hollow interior. The cover 5 has a base plate 50 with a preferably flat lower end face 51. It can preferably be attached to and removed from the flow element 3 without tools. For this purpose, magnets are arranged in both components. The magnets of the flow element 3 are in Figure 1 identifiable. They are marked with the reference number 35. The magnets of the lid 5 are in the Figures 2 and 4 Identifiable. They are marked with the reference number 52.

[0080] The flow element 3 is preferably arranged in a fixed position relative to the housing 2 and is preferably not adjustable at least in the direction of the longitudinal center axis L, i.e. axially.

[0081] The throttle 6 is located in the upper part of the valve V. It has adjustable elements for selectively narrowing the central air channel. The throttle thus has a variable cross-section that determines the airflow that can flow through the central air channel. This variable cross-section determined by the throttle 6 is referred to in this text as the flowable cross-section.

[0082] Downstream of the throttle 6 in the direction of flow, i.e., towards the interior of the building, the cross-section of the central air duct is preferably no longer adjustable. However, it is not necessarily the same size everywhere. This downstream cross-section is preferably formed by the distance between the preferably inwardly curved inner wall of the housing 2 and the casing 30 of the flow element 3.

[0083] In this embodiment, the throttle 6 consists of three components. The first throttle part 60 is rotationally fixed to the housing 2 and / or to the third throttle part 22. The third throttle part 22 is integrally formed with the housing 2 and is also rotationally fixed with respect to the first throttle part 60. The second throttle part 61 is arranged between the first and the third throttle parts 60, 22 and is pivotable or rotatable about the longitudinal center axis L.

[0084] In other embodiments, the third throttle element 22 is also an independent component, preferably rotationally fixed to the housing 2. In other embodiments, only the first and second throttle elements 60, 61 are present, but no third throttle element 22, or only the second and third throttle elements 61, 22 are present, but no first throttle element 60. If only two throttle elements are present, the second throttle element 61 is preferably also designed with an optimized shape for its inlet or outlet surface.

[0085] The first throttle section 60 has locking elements in the form of rotor-like first vanes 601, which extend outwards from a common central section. This central section forms a first coupling element 600. In this example, there are five first vanes 601. However, three, four, six, or any other number of vanes can also be used.

[0086] Hooks or lugs 602 are formed on the end faces of the free ends of the first wings 601. They serve for the mounting of exhaust air filters and / or hoods. They rest, for example, on the upper end face of the second throttle part 61. This is shown in the Figure 1 , 5 and 6 clearly visible.

[0087] The first wings 601 widen towards their free ends. Preferably, all wings 601 are of the same shape and size. The first wings 601 are curved in a radial direction. Preferably, the area left free between two wings 601 corresponds to the area of ​​one wing 601.

[0088] The upper airflow surfaces of the first wings 601 are preferably curved, so that an aerodynamically favorable body is formed.

[0089] The third throttle section 22 has locking elements in the form of third vanes 221, which form geometric counterparts to the first vanes 601. In this example, they are also curved in a radial direction. These third vanes 221 do not terminate freely; rather, their peripheral ends are integrally formed on the inner wall of the first housing section 20. Their central ends merge seamlessly into a central section formed by the second coupling element 220.

[0090] The first coupling element 600 has downward-projecting hooks 603 that engage in receiving openings of the second coupling element 220. In this way, the first throttle part 60 is rotationally fixed to the third throttle part 22 and also to the housing 2.

[0091] In a compound valve V, the first and third vanes 601, 221 are aligned with each other. The first and third vanes 601, 221 are superimposed. Preferably, the free surface of the third vane 221 is also curved. This outflow surface is thus also aerodynamically optimized. Preferably, the flow surfaces of the first and third vanes 601, 221 are identically curved, so that the valve V forms identical inflow and outflow surfaces and can therefore be used for both supply and exhaust air.

[0092] The intermediate second throttle section 61 has an outer ring 610. Inwardly projecting locking elements in the form of second wings 611 are formed at the upper end of the ring 610. The outer ring 610 rests with its free lower end on the second stage 203 of the housing 2. It also rests with its inwardly projecting, upper circumferential edge on the upper end face 204 of the housing 2. This is shown in the Figure 1 , 2 , 3 and 4 clearly visible.

[0093] The ring 610 and thus the second throttle part 61 is rotatable about the longitudinal central axis L, being guided during rotation by the base body 210 of the second housing part 21 and fixed in its axial position by the lugs 602 of the first throttle part 60.

[0094] The second wings 611 of the second coupling part 61 terminate freely towards the longitudinal center axis L. They are also curved, preferably having the same bending radii as the first and third wings 601, 221. Preferably, there is the same number of second wings 611 as there are first and third wings 601, 221. The second wings 611 can be flat. Other configurations are possible.

[0095] The second throttle disk 61 thus forms a flat disk with a circumferential guide sleeve, wherein the disk is arranged between the flat end faces of the first and third vanes 601, 221 and can be rotated relative to them. The rotation is preferably continuous. In other embodiments, it is incremental. In all cases, optical, haptic, and / or acoustic means are preferably provided to indicate to the user when discrete positions of the throttle disk 61 have been reached. Furthermore, such means protect against unintentional adjustment.

[0096] The rotation of the throttle disc 61 serves to adjust the valve V. This is preferably done manually. Alternatively or additionally, however, it can also be motor-driven.

[0097] The adjustment can preferably also be carried out with the valve V already installed in the wall opening 10. In a simple embodiment, this can be done by removing the flow element 3 and the cover 5. In a preferred embodiment, which is shown here by way of example, only the cover 5 is removed, if at all. The through-opening 33 in the casing 30 of the flow element 3 allows access to the adjustment element, here to the rotary pin 4. This is shown in the Figures 1 to 4 as well as 7 and 8 are clearly recognizable.

[0098] The pivot pin 4 has a pin 40, a gear-shaped head 41, and knurling 42 on the circumference of the free end of the pin 40. The knurling 42 increases grip when the pivot pin 4 is turned by hand without the use of any other tools. As shown in the Figures 7 and 8As shown, a tool 9 is preferably provided which can be inserted around or into the pin 40. Depending on the embodiment, the pin 40 is designed with an internal hexagon, a slot, a Phillips head, or a Torx drive to be rotated with a correspondingly shaped pin-shaped tool 9.

[0099] The pivot pin 4 passes through the recess 205 of the first housing part 20, as shown in the Figure 1 and 2 This is recognizable. The head 41 rests on the first housing part 20.

[0100] The second throttle element 61 has teeth 612 on a portion of its inner circumference. The gear of the head 41 engages with these teeth 612 via the recess 205. By turning the pivot pin 4, the second throttle element 61 can be rotated about its longitudinal center axis L. The position of the second vanes 611 relative to the first and third vanes 601, 221 can thus be adjusted manually.

[0101] Preferably, the first housing part 20 has a scale 222 next to the recess, which interacts with a reference 614 of the second throttle part 61. This allows the throttle setting to be recorded and the rotational position of the vanes relative to each other to be determined. This is described in the Figures 2 and 3 recognizable.

[0102] In Figure 7 Figure 1 shows how the tool 9 can be inserted into the pivot pin 4. Removal of the flow element 3 is generally not necessary for this, as shown in Figure 2. Figure 8 It can be seen that the flow element 3 preferably has the through-opening 33 at a suitable location.

[0103] Preferably, however, the flow element 3 can be easily removed and reattached, for example, using a bayonet fitting. In this case, the pivot pin 4 can be easily exposed. The knurling 42 allows the pivot pin 4 to be turned by hand, without tools.

[0104] The rotary pin allows for a very fine adjustment of the throttle 6 thanks to a translation, especially when a tool is used for rotation, but also for tool-free manual adjustment.

[0105] Preferably, a locking mechanism is provided for the second throttle part 61, i.e., the throttle disc, and the pivot pin 4. This ensures that the selected rotational position of the throttle disc is permanently set.

[0106] Other ways of adjusting the various positions of the throttle disc 61 are possible.

[0107] Thanks to the special shape of the throttle 6's vanes, it is ensured that closed and open areas exist in almost every throttle position and across almost every radius of the throttle 6. The only exceptions are a maximally closed state of the throttle 6 and possibly also a maximally open state.

[0108] In this context, "maximum" does not mean that all spaces between the first and third vanes 601, 221 are completely open or closed. They merely denote the two extreme positions possible for the respective throttle. Preferably, however, the end positions correspond to a complete closure and a complete opening of the spaces between the first and third vanes 601, 221.

[0109] The cross-sectional areas of the second vanes 611 of the throttle disk 61 preferably correspond to the areas of the first and third vanes 601, 221. This allows the through-openings of the throttle disk 6, formed by the respective distances between the first and third vanes 601, 221, to be completely closed and completely opened. Figure 9 A partially closed throttle 6 is shown, which can be closed even further. Figure 10The diagram shows a fully open throttle 6. The maximum end position in the closing direction is not shown. In this end position, the throttle 6 is completely closed.

[0110] The above-mentioned special distribution of open and closed areas in the respective throttle settings is achieved by the curved shape of the individual vanes 601, 221, 611.

[0111] Furthermore, the second wings 611 form a central passage opening 613 around the longitudinal center axis L. This is shown in the Figures 11 to 13 Clearly visible. The central through-opening 613 is pierced by the hooks 603. However, it is larger than the cross-section of the first and second coupling elements 600, 220. This results in the flowable area of ​​the throttle 6 widening towards the longitudinal center axis L.

[0112] The shape of the free ends of the second wings 611 is preferably shaped such that it adapts to the shape of the first coupling element 600 of the first throttle part 60 and completely closes the extended area in the end position of the throttle.

[0113] As in Figure 9 As can be clearly seen, the cross-sectional area through which the partially open throttle can flow forms six separate sections, each of which has an L-shape. The longer leg of the L-shape is curved. The shorter leg of the L-shape is preferably also slightly curved. Preferably, the transition from the long to the shorter leg is curved, preferably forming an angle of more than 90°.

[0114] This L-shape is preferred, but not absolutely necessary to realize the invention.

[0115] Based on the Figures 14 to 16The difference between the design of the wings 601, 221, 611 of the throttle 6 according to the invention and known wings can be explained.

[0116] Figure 14 This shows a familiar configuration. The wings are circular sectors. The crosses mark the areas through which flow occurs when the throttle is fully open. The dashed lines show some of the radii. As can be easily seen, there are radii that lie entirely within areas through which flow occurs and radii that lie entirely within closed areas.

[0117] Figure 15 The diagram shows a throttle with curved blades. Again, the crosses indicate the flow areas and the dashed lines some of the radii. The curved blades mean that all or nearly all radii pass through both flow areas and closed, i.e., non-flowing, areas.

[0118] As the graphic shows Figure 16 shows, is for the throttle according to Figure 15 the integrated locking mechanism is more consistent across the radius than for the throttle according to Figure 14 This leads to a more optimal flow distribution and prevents extremes in flow velocities.

[0119] The device according to the invention enables optimal fine adjustment of the device in the assembled state. REFERENCE MARK LIST

[0120] 10 Wall opening 41 Head 11 Wall 42 knurling 2 Housing 5 Lid 20 first housing part 50 Base plate 200 basic body 51 lower front surface 201 first flange 52 magnet 202 first stage 203 second stage 6 throttle 204 upper front surface 60 first throttle part 205 Exclusion 600 first coupling element 21 second housing part 601 first wing 210 basic body 602 Nose 211 second flange 603 Hook 22 third throttle part 61 second throttle part 220 second coupling element 610 ring 221 third wing 611 second wing 222 scale 612 Perforation 613 central passageway 3 Flow element 614 reference 30 Coat 31 Egress edge 8 air duct 32 lower front surface 80 Exit 33 Passage opening 34 coupling element 9 Tool 35 magnet V valve 4 pivot pin L Longitudinal center axis 40 Pen

Claims

1. A device for adjusting an air volume flow, in particular in an air distribution network, wherein the device has an air channel which can be flowed through and which defines a longitudinal centre axis and a throttle (6) which is arranged in the air channel, wherein a size of a cross section of the air channel which can be flowed through can be changed by means of the throttle (6), wherein the throttle has an adjustment means for changing the cross section which can be flowed through, wherein the device has in addition to the throttle (6) a flow element (3) which is arranged in the air channel and which has a cover (30), the circumference of which increases in the direction away from the throttle (6), and wherein the adjustment means (4, 612) can be activated with the device being mounted in a wall opening (10); characterized in that the throttle (6) has at least a first throttle portion (60) having first blocking elements (601) and a second throttle portion (61) having second blocking elements (611), wherein the position of the second blocking elements (611) can be changed relative to the first blocking elements (601) in order to change the size of the cross section which can be flowed through, and wherein the second throttle portion is rotatable or pivotable relative to the first throttle portion about the longitudinal centre axis.

2. The device according to Claim 1, wherein the adjustment means (4, 612) can be activated manually.

3. The device according to either of Claims 1 and 2, wherein the flow element (3) has a through-opening (33) which enables access to the adjustment means (4, 612).

4. The device according to any one of Claims 1 to 3, wherein the through-opening (33) is arranged in a decentralized manner in the cover (30) of the flow element (3).

5. The device according to any one of Claims 1 to 4, wherein the cover (30) of the flow element (3) in the flow direction is arranged with spacing from the first blocking elements (601) and / or the second blocking elements (611).

6. The device according to any one of Claims 1 to 5, wherein the second throttle portion (61) is supported on its circumference.

7. The device according to any one of Claims 1 to 6, wherein the second throttle portion (61) is not guided and has no bearings in a central region.

8. The device according to any one of Claims 1 to 7, wherein the second throttle portion (61) is configured in a rotatable manner, and wherein the adjustment means (4, 612) is arranged in a decentralized manner.

9. The device according to any one of Claims 1 to 8, wherein the adjustment means has a tooth arrangement (612) and a gear (41) which is in engagement with the tooth arrangement (612), and wherein the tooth arrangement (612) is arranged on the second throttle portion (61) and the gear (41) forms a head of a rotary pin (4).

10. The device according to Claim 9, wherein the rotary pin (4) has a pin (40) which can be contacted through the through-opening (30) of the flow element (3) in order by rotating the pin (40) to rotate the gear (41) along the tooth arrangement (612).

11. The device according to any one of Claims 1 to 10, wherein the cover (30) runs spaced apart from an inner wall of a housing (2), and wherein the air channel runs in the gap between the cover (3) and the inner wall of the housing (2).

12. The device according to any one of Claims 1 to 11, wherein the flow element (3) in the mounted state of the device is arranged indirectly or directly on the throttle (6) so as to be releasable and able to be secured again.

13. The device according to any one of Claims 1 to 12, wherein the flow element (3) has a bell-like configuration having a cross section which expands in a direction away from the throttle (6) and the cover (30) which is curved inwards.

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