EP2691658B1 - Entraînement à membrane actionné par fluide - Google Patents

Entraînement à membrane actionné par fluide Download PDF

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Publication number
EP2691658B1
EP2691658B1 EP12710443.8A EP12710443A EP2691658B1 EP 2691658 B1 EP2691658 B1 EP 2691658B1 EP 12710443 A EP12710443 A EP 12710443A EP 2691658 B1 EP2691658 B1 EP 2691658B1
Authority
EP
European Patent Office
Prior art keywords
housing
membrane
locking projections
drive according
annular
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP12710443.8A
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German (de)
English (en)
Other versions
EP2691658A1 (fr
Inventor
Kurt Stoll
Ulrich Kees
Harald Röhrig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Festo SE and Co KG
Original Assignee
Festo SE and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Festo SE and Co KG filed Critical Festo SE and Co KG
Publication of EP2691658A1 publication Critical patent/EP2691658A1/fr
Application granted granted Critical
Publication of EP2691658B1 publication Critical patent/EP2691658B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/10—Characterised by the construction of the motor unit the motor being of diaphragm type

Definitions

  • the invention relates to a fluid-actuated diaphragm drive, having a housing having a longitudinal axis, each having one of two in the axial direction of the longitudinal axis by far opposite end-side end walls forming hood-shaped housing parts, each having a framed by an annular side wall opening and the common Limiting a housing interior with mutually facing openings coaxially attached to each other and in the region of the annular side walls formed by an engaging from behind locking projections of the housing parts bayonet connection means, and with a drive unit comprising a fixed between the two housing parts and axially deflectable membrane drivingly with a at least one of the end walls slidingly passing through rod body is connected and the housing interior fluid-tight in two ax ial adjacent working chambers, of which at least one fluidbeetzschlagbar.
  • One from the DE-A-1426452 known membrane drive of this type includes a housing which consists of two hood-shaped housing parts, which are attached to each other facing openings to each other. At their side walls framing the openings, the housing parts are fixed to one another by means of a bayonet connection device.
  • the bayonet connection device includes a arranged on one housing part, radially projecting flange with circumferentially adjacent recesses and also arranged on the other housing part, acting as locking projections bent portions. In the mutually fixed state of the housing parts, the locking projections engage behind the existing between adjacent recesses of the flange edge portions of the flange, so that the housing parts are axially immovably fixed to each other.
  • an axially deformable membrane is arranged in the interior of the housing under seal, which divides two working chambers from each other.
  • a rod body which is coupled with the diaphragm in a movement-related manner is axially displaced.
  • the two housing parts can be relatively quickly fixed in the context of a plug-rotation movement together.
  • a highly rugged outer surface of the housing which is very susceptible to contamination and difficult to clean. Not to be underestimated is also the risk of injury at the very exposed edges of the bayonet connection device.
  • the housing also consists of two interlocked housing parts.
  • the joining process of the two housing parts is there a pure plug-in operation, because the locking is caused by bending of retaining tabs after the housing parts have been put together.
  • a plug serving to receive a socket has a ring carried by two retaining clips, on which are formed two inwardly projecting hook-like locking projections, which are axially engaged behind by outwardly projecting locking projections of a plug-in socket.
  • the locking projections of the sleeve come to lie in the region of two peripheral slots of the plug, which extend between the brackets and in which impurities can be deposited.
  • a brake cylinder is known in which two housing parts are fastened by means of a bayonet connection to each other. There is either a direct bayonet engagement between the housing parts or a separate bayonet ring is used.
  • the invention has for its object to provide a diaphragm drive, which is easy to assemble in cleaning-friendly structure.
  • each other housing parts expediently with their two side walls under coaxial alignment axially into one another.
  • the radially outer side wall has inwardly projecting outer locking projections, while the radially inner side wall has radially outwardly projecting inner locking projections.
  • Outer and inner locking projections overlap in the radial direction, whereby they axially support each other axially with mutually axially facing locking flanks to ensure the cohesion of the housing parts.
  • the two side walls are expediently attached to one another in such a way that in the joining region there is a joint line lying on the outer surface of the housing and concentric with the longitudinal axis of the housing. In the region of this joint line, the two side walls are expediently abutting one another or are only minimally axially spaced from one another.
  • Arranged on the two side walls and belonging to the bayonet connection device locking projections are located in the region of the outer surface of the housing opposite inside of the joint line and thus from the opposing sides of the joint line portions of the two side walls to the outside of the membrane drive, in all Directions covered.
  • the joint line expediently concludes a joining plane radially on the outside, which is defined by two axially opposite and facing each other annular end faces of the two side walls. If these annular end surfaces abut each other or only minimally spaced from each other, can an optimal all-round shielding of the bayonet connection device can be ensured.
  • a preferred embodiment of the bayonet connection device provides that the outer locking projections are arranged radially inwardly on an annular support portion of the one side wall and the inner locking projections carrying other side wall has a flange-shaped and radially outwardly projecting annular cover portion axially in front of the end face of the Carrying section protrudes and this covers.
  • the inner locking projections are expediently radially on the outside on an annular support portion of the associated side wall, which projects coaxially into the annular support portion of the other side wall, wherein it is surmounted by the annular cover portion radially outward.
  • the mutually facing locking edges of all locking projections extend without inclination in a direction perpendicular to the longitudinal axis of the housing level, which can be described as a locking plane.
  • the membrane is clamped axially between the two side walls. The clamped portion of the membrane is thus compressed axially in the manufacture of the bayonet connection, so that it al reaction a the locking projections axially against each other exciting clamping force builds up.
  • locking flanks can be readily provided with an axial slope, so that during manufacture of the bayonet connection during of the associated turning operation can build up axial biasing forces.
  • stop means are arranged on the two side walls of the housing parts, which limit the relative rotational angle of the housing parts in the production of the bayonet connection. In this way, over-rotation is prevented and it is ensured that the cooperating components of the bayonet connection device automatically reach the correct relative position during assembly without costly control.
  • the stop means in particular comprise a arranged on the one side wall, aligned parallel to the longitudinal axis of the housing stop pin, which cooperates to limit the rotational angle with a arranged on the other side wall and oriented in the circumferential direction of the longitudinal axis stop surface.
  • the stop face may in particular be formed by an edge surface of a locking projection of the bayonet connection device.
  • the bayonet connection device are expediently associated with securing means which prevent unintentional turning back and accordingly unintentional release of the bayonet connection.
  • These securing means are formed in particular in assembly with the stop means.
  • the side wall which is equipped with the stop face, has a locking recess in the area of the stop face into which the stop pin, which is furthermore anchored to the other side wall, can be inserted. The insertion movement can take place in particular in the context of a screwing operation when the stop pin is in threaded engagement with the side wall carrying it.
  • the housing may in particular have a disk-like outer shape. It expediently has an outer circular-cylindrical contoured middle section, in the region of which the concealed bayonet connection device is located, and adjoins axially on both sides in each case a truncated-cone-shaped tapering outer surface section.
  • An expedient structure of the membrane drive provides that the two working chambers fluid-tight partitioning from each other membrane is clamped under axial bias of the side walls of the two assembled housing parts.
  • the clamping results on the one hand an optimal sealing contact and on the other hand an effective support of the cohesion of the two housing parts.
  • the diaphragm is expediently screwed to the associated rod body.
  • other types of connection are also possible.
  • the rod body can either enforce only one of the two end walls or it passes through the manner of a continuous rod simultaneously both end walls. In the latter case, it may be possible to selectively use either of the two on the opposite sides of the housing protruding end portions of the rod body for force picking.
  • the rod body passes through both end walls, it is also possible to use the one end wall passing through the length section for the power tap and the longitudinal section passing through the other end wall for position detection and / or for position indication and / or position specification.
  • the membrane drive can be designed so that both of the membrane sealed from each other working chambers are fluidbeaufschlagbar.
  • a control channel passing through the housing or the drive unit opens through each working chamber, through which a controlled fluid admission of the associated working chamber is possible.
  • the diaphragm drive can thus be used in the manner of a double-acting linear drive.
  • the return spring device consists of a relatively strong compression spring device.
  • the restoring force can be overcome continuously, so that there is the possibility to use the diaphragm drive as a proportional drive, in which the realized stroke depends proportionally on the imposed fluidic pressure force.
  • This mode of operation is additionally promoted by the membrane which can be moved without difficulty inside the housing.
  • the membrane drive can be used for a variety of drive tasks. In particular, it can be used wherever previously conventional short-stroke cylinders were used come. Above all, it is also suitable as a drive in the process industry and there in particular for the actuation of process valves of various kinds. It can be used for example for actuating a linear slide valve or as a drive for a pinch valve.
  • the membrane drive can be variably designed in one and the same size for different maximum strokes of the membrane or the drive unit containing the membrane. This is done in particular by providing one or more Hubbegrenzungs institute that are attachable in one or both working chambers on the end wall of the respective working chamber limiting end wall and act as a stop means for limiting the stroke.
  • the maximum stroke of the drive unit is thus defined by the axial height of the installed Hubbegrenzungsiatas. It is possible to install a plurality of stroke limiting elements axially staggered to vary the stroke. Alternatively, several Hubbegrenzungsetti can be provided with different heights, which are mounted alternatively in the respective working chamber.
  • Such a structure of the membrane drive has the advantage that one and the same membrane drive for different stroke ranges can be used without changing the outer dimensions.
  • the at least one Hubbegrenzungselement is annular and arranged coaxially in a working chamber.
  • the diaphragm drive expediently has at least one fastening interface on the outside of its housing.
  • a central fastening interface in a central arrangement is preferably located on the outside of one of the two end-side end walls.
  • a threaded hole is recommended in which a fastening screw can be screwed.
  • the attachment interface can also be formed on an insert made of metal, which is embedded in the plastic material in particular during the injection molding of the associated housing part , In this way, despite a plastic housing, a high strength of the mounting interface can be ensured.
  • the membrane drive it is expedient to equip the membrane drive with position detection means for detecting at least one relative position of the diaphragm and the rod body comprising the drive unit relative to the housing.
  • the position detection means may allow one or both stroke end positions of the drive unit and / or one or more intermediate positions to capture the drive unit. Also, a distance measurement to control the entire stroke range of the drive unit can be provided.
  • Sensors for position detection can be mounted, for example, on at least one of the two housing parts. It is thus possible to integrate sensors which occupy little space directly into at least one housing part.
  • the position detection means can have, for example, a position transmitter which responds to an actuating element, in particular a permanent magnet, moved along with the drive unit. If the diaphragm drive is used to actuate a process valve, it is possible in this way to very precisely monitor the current opening degree of the valve.
  • the membrane drive can also be equipped with an optical position detection without any problem.
  • the rod body can have, for example, a bar code or line scale introduced, in particular, by laser processing, which can be scanned by an optical sensor arranged on the housing.
  • position-detecting means of non-electrical type instead of electrically operating position-detecting means.
  • magnetically actuable fluid switches can be used for position detection.
  • the housing of the membrane drive only consists of two hood-like housing parts, eliminating an additional cylinder tube and it results in a compact design with only a few components.
  • the use of a diaphragm instead of a piston reduces the internal friction of the system and ensures an optimal response. In addition, no lubrication is required.
  • the membrane drive is expediently equipped with a cylindrical and preferably circular cylindrical rod body.
  • a rod body with polygonal and in particular with a quadrangular cross-sectional contour is also suitable, since in this way it is particularly easy to realize an anti-twist device.
  • a non-rotating, in particular as a square profiled rod body has the advantage that the membrane is not subjected to torsional stresses, which benefits their life expectancy.
  • the drive unit can be equipped inside the housing with rubber-elastic buffer means, which ensure a muffled impact in the end positions.
  • Suitable end position buffers can, in particular, protrude axially over the membrane on both sides, so that upon reaching a stroke end position, they end on an end wall opposite the drive unit can meet.
  • the end position buffers are expediently designed as direct components of the membrane.
  • the housing parts fastened to one another according to the invention can consist of metal as well as of a polymer and in particular of a plastic material.
  • At least the longitudinal section passing through an end wall can be used for limiting the stroke and / or for detecting the position of the drive unit.
  • an actuating element which cooperates with a fixed position sensor fixed to the housing and which is, for example, a magnetic element can be arranged on this longitudinal section of the rod body outside the housing.
  • the actuating element may for example be carried by an adjusting nut, which is axially adjustably seated on an external thread of the longitudinal section of the rod body and which can be fixed by means of a lock nut.
  • the position sensor is suitably attached directly or indirectly to the housing of the membrane drive.
  • an axially adjustable stop element in particular can be arranged, which can specify a certain axial position of the drive unit by cooperation with a arranged on the housing or formed directly from the housing counter-stop.
  • the rod body can be in one piece or also in several parts. It may, for example, comprise two rod body elements which are attached to the membrane from opposite sides and which each have one of the end walls form passing lengths of the rod body.
  • the membrane is recommended by a fiber assembly and / or by a tissue reinforced structure.
  • the reinforcing means may in particular be arranged on one side outside or centrally in the interior of the membrane material.
  • a material for the membrane is recommended rubber or silicone or a thermoplastic polyurethane. In any case, it is advantageous if the membrane material is not only flexible, but also elastically deformable.
  • the membrane drive can additionally be equipped with light-emitting means that signal the achievement of at least one specific stroke position of the drive unit.
  • the rod body is particularly recommended a structure made of aluminum or stainless steel.
  • the two housing cover are advantageously made without cutting.
  • the membrane drive enables the realization of very fast movements of the drive unit. This can be used, for example, for punching, riveting, punching, stamping, embossing, ejecting or sorting.
  • the moving mass is very low. Since at least that working chamber, which is not penetrated by a rod body, hermetically sealed executable is, the membrane drive can operate energetically with very high efficiency. Also on lubrication measures in relation to the membrane can be omitted.
  • the membrane drive designated in its entirety by reference numeral 1, is designed for fluid power controlled actuation wherein the fluid force is provided by a fluid supply and drainable fluid medium as required.
  • This drive medium is in particular compressed air.
  • the membrane drive can also be operated by means of other gaseous drive media and also by means of liquid drive media.
  • the diaphragm drive 1 has a housing 2 with a longitudinal axis 3. It also has a relative to the housing 2 in the axial direction of the longitudinal axis 3 linearly movable drive unit 4. The relative movement of the drive unit 4 with respect to the housing 2 by the controlled fluid admission on the part of the drive medium caused.
  • the housing 2 has two hood-shaped housing parts 5, 6, which are also referred to for better distinction as the first and second housing part 5, 6.
  • Each housing part 5, 6 has an in particular substantially disc-shaped end-side end wall 5a, 6a and an integrally coaxially adjoining annular side wall 5b, 6b.
  • Each housing part 5, 6 frames with its annular side wall 5b, 6b an opening 7a, 7b arranged at an axial distance from the associated end-side end wall 5a, 6a.
  • the two housing parts 5, 6 are attached coaxially to each other with mutually facing openings 7a, 7b, wherein they together define a housing interior 8. With the cooperation of the two annular side walls 5b, 6b, the housing parts 5, 6 are fastened to one another.
  • Each housing part 5, 6 expediently has an at least substantially round and in particular circular outer contour, which by way of example only has a connection eye 11a, 11b formed on the outside of each housing part 5, 6 in the transition region between the end-side end wall 5a, 6a and the annular side wall 5b, 6b is interrupted.
  • the connection eyes 11a, 11b extend rib-like in the radial direction into the region of the radially oriented outer contour of the associated side wall 5b, 6b, wherein at their radially outwardly facing end surfaces each have a connection opening 12a, 12b, which is for supplying and removing the drive medium suitable is.
  • the drive unit 4 has a membrane 13 arranged in the housing interior 8 and extending there transversely to the longitudinal axis 3.
  • the membrane 13 is expediently preformed substantially in the manner of a pot. It has flexurally flexible properties and consists in particular of a rubber-elastic membrane body, which is combined with an integrated or externally attached fabric reinforcement.
  • the membrane 13 has, by way of example, a circular outer contour. It has radially outward on an uninterrupted circumferential, in particular bead-shaped fastening edge 14, with which it is clamped between the two annular side walls 5b, 6b under axial prestress. With the cooperation of the membrane 13, the housing interior 8 is subdivided in a fluid-tight manner into two axially successive, hereinafter referred to as the first and second working chamber 15a, 15b working chambers.
  • the first connection opening 12a arranged on the first housing part 5 communicates with the first working chamber 15a via a first control passage 16a passing through the wall of the first housing part 5, while the second connection opening 12b arranged on the second housing part 6 passes over a second control passage 16b passing through the wall of the second housing part 6 communicates with the second working chamber 15b.
  • first control passage 16a passing through the wall of the first housing part 5
  • second connection opening 12b arranged on the second housing part 6 passes over a second control passage 16b passing through the wall of the second housing part 6 communicates with the second working chamber 15b.
  • the drive unit 4 contains as a further component in addition to the membrane 13 also called rod body 17 rod-shaped member which is fixed at one end in the central region of the membrane 13 and which extends from the diaphragm 13 in the axial direction of the longitudinal axis 3, wherein it slidably through a passage opening 18 passing through the end-side end wall 5a of the first housing part 5 passes outwards.
  • the rod body 17 has a tapping portion 22 arranged outside the housing 2, on which the movement or force exerted by the drive unit 4 can be tapped off in order to actuate, for example, a valve body of a process valve combined with the membrane drive 1.
  • annular guide means 23 and sealing means 24 are arranged, which surround the rod body 17 coaxial and which ensure that the rod body 17 on the one hand with respect to the Housing 2 is guided exactly linearly displaceable and that on the other hand, a fluid outlet from the housing interior 8 is excluded through the passage opening 18 therethrough.
  • the membrane 13 is fixed to the rod body 17 by means of a screw connection device 25.
  • an exemplary fastening screw 26 engages from the side of the second working chamber 15b through the membrane 13 and is screwed into the rod body 17 so that the membrane 13 is clamped between the rod body 17 on the one hand and a screw head 27 of the fastening screw 26 on the other hand.
  • the clamping also results in a fluid-tight connection, which prevents a fluid transfer between the two working chambers 15a, 15b.
  • membrane 13 may be fixed by other fastening measures on the rod body 17, for example by riveting.
  • the drive unit 4 expediently also contains two support plates 28, the outer diameter of which is smaller than the inner diameter of the housing interior 8 and which adjoin the axial axis of the coaxial arrangement on both axial sides of the diaphragm 13 at the same.
  • the support plates 28 are incorporated into the screw connection means 25 and are located with axial bias of opposite axial sides of the membrane 13 at.
  • the support plates 28 can be rounded convexly toward the membrane 13, so that each results in a curved support surface 29, on which the membrane 13 can support and roll off, if they for the purpose of actuation of the drive unit 4 by appropriate Fluid loading is deflected axially.
  • the support plate 28 may for example consist of a disc which may be bent axially on the outer edge to form the support surface 29.
  • both working chambers 15a, 15b can be acted upon by a fluidic drive medium.
  • a fluidic drive medium Depending on the thus set pressure difference between the two working chambers 15a, 15b can be caused in this way an axial deflection of the radially within the clamped attachment edge 14 lying portion of the membrane 13, so that also the rod body 17 moves accordingly.
  • a linear drive movement 34 of the drive unit 4 results in the axial direction of the longitudinal axis 3 relative to the housing 2.
  • the membrane drive 1 can also be designed as a single-acting drive, wherein only one of the two working chambers 15a, 15b is formed fluidbeetzschlagbar or used for Fluidbeaufschlagung and wherein in one of the two working chambers 15a or 15b a return spring means 33 is arranged, on the one hand on the housing 2 and on the other hand supported on the drive unit 4 and by which the drive unit 4 is biased in a basic position.
  • a return spring device 33 is indicated schematically in the drawing. It is designed in particular as a compression spring device and expediently designed as a coil spring device, wherein they are in the Housing interior 8 arranged longitudinal portion of the rod body 17 coaxially encloses.
  • An optional return spring device 33 can be supported by the drive unit 4, in particular on one of the abovementioned support plates 28.
  • the return spring means 33 may also be present when the diaphragm drive 1 is used as a double-acting drive.
  • the drive unit 4 is expediently movable between two Hubendlagen.
  • One of the stroke end positions is the basic position explained above. In each stroke end position, the drive unit 4 is supported on the inner surface of one of the two front end walls 5a, 6a.
  • the clamped fastening edge 14 of the membrane 13 expediently extends in a plane perpendicular to the longitudinal axis 3 mounting plane.
  • This attachment plane is in particular a median plane for the possible axial deflection movement of the diaphragm 13.
  • the diaphragm 13 In one stroke end position, the diaphragm 13 is deformed starting from the fastening plane in the direction of the one end end wall 5a, in the other stroke end position it is in the direction of the other end end wall 6a deformed.
  • the membrane 13 expediently a pot- or cup-like shape.
  • At least one attachment interface 35 On the outside of the housing 2 is expediently at least one attachment interface 35, via which the housing 2 of the membrane drive 1 can be attached to an external structure.
  • a fastening interface 35 is arranged axially on the outside of the second housing part 6, which is not penetrated by the rod body 17, in particular at a central location, so that it is penetrated by the longitudinal axis 3.
  • the central fastening interface 35 is realized in particular in the form of a threaded hole coaxial with the longitudinal axis 3, by means of which the housing 2 can be externally fastened in the context of a screw connection.
  • An advantage of the central attachment interface 35 is that the housing 2 is relatively arbitrarily alignable relative to the longitudinal axis 3, before the final attachment takes place. In this way, the housing 2 can be variably oriented in terms of angle of rotation in accordance with the conditions prevailing at the place of use. In particular, the connection openings 12a, 12b can thereby be optimally oriented.
  • rod body 17 may also be formed so that it completely penetrates the housing interior 8 axially and also passes through a further passage opening formed on the second housing part 6 axially displaceable.
  • a rod body 17 may be formed either in one piece or have a plurality of, in particular in the region of the membrane 13 interconnected rod elements.
  • two mutually axially oppositely oriented tap portions 22 of the drive unit 4 are provided for optional use.
  • a rod body 17 completely axially passes through the housing 2, at least one of the two end sections arranged outside the housing 2 can be used for position detection and / or stroke adjustment of the drive unit 4.
  • the membrane drive can have at least one stroke limiting element 36 arranged in the interior of at least one working chamber 15a, 15b which can be fixed or fixed to the axial inner surface of at least one end-side end wall 5a, 6a facing the membrane 13.
  • the stroke end position of the drive unit 4 which is normally predetermined directly by an end-side end wall 5a, 6a, can be set differently.
  • the inserted stroke limiting element 36 limits the axial stroke of the drive unit 4 and thereby makes it possible to make a variation of the stroke provided by the drive unit 4 without changing the basic structure of the membrane drive.
  • the Hubbegrenzungselement 36 may be fixed, for example by a screw or an adhesive connection on the associated housing part 5, 6. It is possible to install several Hubbegrenzungs institute 36 in cascaded form at the same time to define depending on the number of installed Hubbegrenzungs institute 36 different maximum strokes. It is also possible to provide a plurality of stroke limiting elements 36 of different lengths, which can alternatively be installed in the housing 2 depending on the desired maximum stroke.
  • the Hubbegrenzungselement 36 is suitably annular and may preferably be installed with respect to the longitudinal axis 3 coaxial alignment. It is a separate with respect to the housing 2 component that is installed only with appropriate request.
  • the membrane drive 1 is equipped with position detection means 37 which make it possible to detect at least one relative position of the drive unit 4 assumed relative to the housing 2.
  • the position detection means 37 can be designed to detect one or both stroke end positions of the drive unit 4 and / or to detect at least one intermediate position between the two stroke end positions and / or to continuously detect the entire stroke of the drive unit 4.
  • Particularly suitably designed position detection means 37 comprise a fastening groove 38 arranged on the outside of each housing part 5, 6 and arranged in particular in the immediate vicinity of a respective connection eye 11a, 11b, which aligns in particular parallel to the longitudinal extent of the respective connection eye 11a, 11b, which is radially oriented with respect to the longitudinal axis 3 is.
  • Each fastening groove 38 is designed to receive a position sensor 42 which can be actuated without contact by an actuating element 43 arranged on the drive unit 4 in the housing interior 8 and in particular as a permanent magnet.
  • Each position sensor 42 responds, in particular, when the drive unit 4 has reached the assigned stroke end position.
  • the fastening groove 38 is formed in particular on a fastening rib 44 integrally formed on the adjacent connection eye 11a, 11b.
  • the position detecting means 37 are indicated only schematically in the drawing.
  • housing parts 5, 6 of the housing 2 expediently consist of a polymer material and in this case in particular of a plastic material.
  • the housing parts 5, 6 can be made very easily and inexpensively without cutting.
  • the membrane drive 1 in this case has a low weight. It is understood, however, that a metal version is possible, wherein the housing parts 5, 6 are made in particular of aluminum or stainless steel. A realization of composite materials is possible.
  • the two housing parts 5, 6 are fastened to one another in an advantageous manner by means of a bayonet connection device 45.
  • the two housing parts 5, 6 with openings 7a, 7b facing one another can be axially assembled in advance in a first step and rotated relative to one another in a second step.
  • the direction of the axial Caribbeansteckens coincides with the axial direction of the longitudinal axis 3.
  • the axis of rotation for the rotational movement is formed directly from the longitudinal axis 3.
  • the bayonet connection device 45 is expediently detachable.
  • the two housing parts 5, 6 by a reverse movement - first turning back and then pulling apart - if necessary, be separated from each other again.
  • the bayonet connection device 45 has first latching projections 46a arranged on the first housing part 5 and second latching projections 46b arranged on the second housing part 6.
  • first and second locking projections 46a, 46b engage behind each other on mutually axially facing sides.
  • a particular feature of the bayonet connection device 45 is that the locking projections 46a, 46b are concealed or covered in the assembled state of the housing 2 by the two housing parts 5, 6 in invisible from the outside from any angle. In this way, an outer contour of the membrane drive, which has little tendency to contamination, which is very easy to clean and results in no risk of injury due to particularly exposed and possibly sharp-edged parts.
  • the two housing parts 5, 6 dive axially into one another in their joining area under coaxial alignment.
  • the end-side end wall 6a of the second housing part 6 is enclosed radially outside of the annular side wall 5b of the first housing part 5 over at least part of its length. It can therefore be said that the annular side wall 5b of the first housing part 5 lies outside in the joining region, while the annular side wall 6b of the second housing part 6 is radially inward.
  • this constellation is also the further description of the bayonet connection means 45. It is understood, however, that a reverse assignment of the housing parts 5, 6 is possible, so that the annular side wall 5b axially dips into the annular side wall 6b.
  • the side wall 5b of the first housing part 5 has an annular to the longitudinal axis 3, annular first support portion 47a.
  • the first locking projections 46a also referred to below as outer locking projections 46a, are arranged on the radially inner side of the first support section 47a.
  • a plurality of first and outer locking projections 46a are distributed in the circumferential direction of the longitudinal axis 3 along the first support portion 47a at a mutual distance from each other. Accordingly, between each in the circumferential direction of the first support portion 47 a successive outer locking projections 46 a results in both an axially and radially inwardly open gap, which is hereinafter referred to as the outer gap 48 a.
  • outer lock protrusions 46a and outer spaces 48a are sequentially arranged.
  • the annular side wall 6b of the second housing part 6 has an annular second support portion 47b, which is also arranged coaxially with the longitudinal axis 3. It protrudes axially toward the first housing part 5.
  • the hereinafter also referred to as inner locking projections second locking projections 46b are disposed on the radially outer side of the annular second support portion 47b, wherein their number corresponds to that of the outer locking projections 46a.
  • each adjacent inner locking projections 46b is located axially towards the first housing part 5 and at the same time radially outwardly open space, which is referred to below as the inner gap 48b. In this way, at the second supporting portion 47b, a plurality of inner locking projections 46b and inner spaces 48b distributed circumferentially are arranged alternately successively.
  • the first support section 47a has an axial annular first end face 52a oriented toward the second housing part 6.
  • the second support section 47b has at its end facing the first housing part 5 an axially oriented annular second end face 52b.
  • the outer locking projections 46a expediently connect directly to the first end face 52a, while the inner locking projections 46b expediently directly adjoin the second end face 52b.
  • each locking projection 46a, b and an opposite portion of the associated housing part 5, 6 there is a groove-shaped gap 53a, 53b, which is open in the case of the first housing part 5 radially inward and in the case of the second housing part 6 radially outward.
  • the groove-shaped intermediate spaces 53a, 53b merge in the circumferential direction of the support section 47a, 47b into a subsequent intermediate space 48a, 48b
  • the two housing parts 5, 6 are axially plugged together, so that the second Carrier portion 47b is inserted coaxially into the first support portion 47a, wherein at the same time on each housing part 5, 6 arranged locking projections 46a, 46b in each case one of the other housing part 6, 5 arranged intermediate spaces 48b, 48a dive.
  • the housing parts 5, 6 are inserted axially into one another so far that the locking projections 46a, b of the respective housing part 5, 6 come to rest at the same axial height with the groove-shaped interspaces 53a, 53b of the respective other housing part 6, 5.
  • both the outer and the inner locking projections 46a, 46b are concealed towards the outside of the housing 2. It is even the case that the entire bayonet connection device 45 is hidden concealed by the two housing parts 5, 6 from outside the housing 2.
  • the first support section 47a carrying the outer locking projections 46a is perforated designed so that it completely covers the components of the bayonet connection device 45 enclosed by it. These are, on the one hand, both the outer latching projections 46a disposed on themselves and the inner latching projections 46b engaging in the groove-shaped intermediate spaces 53a of the first housing part 5.
  • the first support portion 47a thus forms a bayonet connecting device 45 radially outwardly shielding radial shielding wall.
  • the same is preferably formed on its radial outer surface smooth surface and in particular circular cylindrical.
  • the components of the bayonet connection device 45 are shielded directly from the wall of the first housing part 5.
  • the components of the bayonet connection device 45 are shielded by the wall of the second housing part 6. This is achieved in that the two housing parts 5, 6 connect to each other axially so that between them only one lying on the radial outer surface of the housing 2 and concentric with the longitudinal axis 3 hinge line 55 is visible. In the area of this joint line 55, the two housing parts 5, 6 are only minimally spaced from each other or are even directly to each other.
  • annular wall section which is coaxial with the second support section 47b is expediently formed on the second housing part 6, said annular wall section being designated as a cover section 56 by its function and projecting radially outwardly in the manner of a flange.
  • the cover section 56 is arranged at an axial distance from the inner locking projections 46b arranged on the second support section 47b and delimits with the inner locking projections 46b in each case one of the already mentioned groove-shaped intermediate spaces 53b.
  • the annular cover section 56 has a radial extent such that it protrudes in front of the annular first end face 52a of the first support section 47a and expediently completely covers it. In this case, the cover section 56 lies opposite the first end face 52a formed on the first support section 47a with a further, axially oriented end face 57.
  • the abovementioned joint line 55 forms the end line of the outer surface 61 of the housing 2 of a joining plane formed between the two housing parts 5, 6, which is defined by the mutually facing annular end faces 52a, 57.
  • annular cover section 56 terminates radially outwardly axially flush with the outer surface of the adjoining first support section 47a. In this way, the formation of an edge is avoided.
  • the housing 2 has an outer circular cylindrical contoured central portion 62 which is defined by itself on the joint line 55 axially adjoining radial outer surface portions 63, 64 of the annular side wall 5b of the first housing part 5 and the cover portion 56 of the second housing part 6.
  • the design of the housing 2 proves to be particularly useful when said central portion 62 axially on both sides each a frusto-conical contoured outer surface portion 65a, 65b of the housing 2 connects, which tapers in the direction away from the other housing part 6, 5 direction.
  • the housing 2 may have a total disk-like shape.
  • the embodiment does not require such additional measures, in that here the locking flanks 54a, 54b of all the locking projections 46a, 46b extend without a slope in a plane perpendicular to the longitudinal axis 3 of the housing 2.
  • suitable stop means 66 are expediently arranged on the two annular side walls 5b, 6b.
  • the stop means 66 comprise an exemplary arranged on the side wall 6b of the second housing part 6 stop pin 67 which is screwed into an axial threaded bore 68 of the cover 56. He stands in the axial direction over the end face 57 of the cover 56. It is expediently located in a region adjoining one of the inner locking projections 46b in the circumferential direction of the second support section 47b.
  • the stopper pin 67 dips into that outer gap 48 a, which is bounded on one side by the stop surface 72.
  • the two housing parts 5, 6 can now be rotated so far against each other until the stop pin 67 runs onto the stop surface 72. Then the desired relative rotational position between the two housing parts 5, 6 is found, in which the bayonet connection device 45 is correctly effective.
  • the bayonet connection device 45 are expediently also associated with securing means 73, with which, after produced bayonet connection a reverse rotation between the two housing parts 5, 6 can be realized. It can be prevented in this way unintentional release of the bayonet connection.
  • the securing means 73 are at least partially formed by the stop means 66. More precisely, the stopper pin 67 also acts as a locking pin 74 which is positively inserted into a locking surface 75 of the first housing part 5 adjacent to the stop surface 72 in the axial direction of the longitudinal axis 3, when the desired rotational angle position between the two housing parts 5, 6 is reached.
  • the locking recess 75 adjoins the stop surface 72, in particular in the axial extension.
  • the locking pin 74 is in particular a threaded pin, which is received screwed into the threaded bore 68. To lock and secure the relative rotational position between the two housing parts 5, 6, it can be screwed from the outside with a suitable screwing tool, so that it dips into the locking recess 75.
  • securing means 73 may also be formed independently of the stop means 66.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Diaphragms And Bellows (AREA)
  • Combined Devices Of Dampers And Springs (AREA)

Claims (15)

  1. Entraînement à membrane actionné par un fluide, avec un boîtier (2) présentant un axe longitudinal (3), lequel dispose de deux parties de boîtier (5, 6) en forme de capot formant respectivement une des deux parois de terminaison (5a, 6a) situées côté frontal se faisant face à distance dans la direction axiale de l'axe longitudinal (3), lesquelles parties de boîtier présentent respectivement une ouverture (7a, 7b) encadrée par une paroi latérale (5b, 6b) de forme annulaire et sont placées l'une contre l'autre de manière coaxiale en délimitant conjointement un espace intérieur de boîtier (8) avec des ouvertures (7a, 7b) tournées les unes vers les autres et qui sont fixées les unes aux autres dans la zone des parois latérales (5b, 6b) de forme annulaire par un dispositif de liaison à baïonnette (45) formé à partir de parties faisant saillie de verrouillage (46a, 46b) venant en prise par l'arrière des parties de boîtier (5, 6), et avec une unité d'entraînement (4) comprenant une membrane (13) fixée entre les deux parties de boîtier (5, 6) et pouvant être orientée de manière axiale, laquelle est reliée en entraînement à un corps de tige (17) traversant de manière mobile par glissement au moins une des parois de terminaison (5a, 6a) et qui divise l'espace intérieur de boîtier (8) de manière étanche aux fluides en deux chambres de travail (15a, 15b) adjacentes de manière axiale, dont une au moins peut être soumise à l'action d'un fluide, caractérisé en ce que les parties faisant saillie de verrouillage (46a, 46b) du dispositif de liaison à baïonnette (45) sont dissimulées par les deux parties de boîtier (5, 6) de manière invisible depuis l'extérieur selon tous les angles d'observation.
  2. Entraînement à membrane selon la revendication 1, caractérisé en ce que les deux parois latérales (5b, 6b) de forme annulaire plongent l'une dans l'autre de manière axiale, dans lequel la paroi latérale (5b) située radialement à l'extérieur présente des parties faisant saillie de verrouillage (46a) extérieures dépassant vers l'intérieur radialement et la paroi latérale (6b) disposée à l'intérieur radialement présente des parties faisant saillie de verrouillage (46b) intérieures dépassant vers l'extérieur radialement et dans lequel les parties faisant saillie de verrouillage (46a, 46b) extérieure et intérieure se chevauchent de manière radiale par des flancs de verrouillage (54a, 54b) tournés de manière axiale les uns vers les autres.
  3. Entraînement à membrane selon la revendication 2, caractérisé en ce que les deux parois latérales (5b, 6b) de forme annulaire sont placées l'une contre l'autre en formant une ligne d'assemblage (55) située au niveau de la surface extérieure (61) du boîtier (2) et concentrique par rapport à l'axe longitudinal (3), dans lequel les parties faisant saillie de verrouillage (46a, 46b) des deux parois latérales (5b, 6b) se trouvent dans la zone du côté intérieur, opposé à la surface extérieures (61) du boîtier (2), de la ligne d'assemblage (55) et sont recouvertes vers l'extérieur par les tronçons, se faisant face au niveau de la ligne d'assemblage (55), des deux parois latérales (5b, 6b).
  4. Entraînement à membrane selon la revendication 3, caractérisé en ce que la ligne d'assemblage (55) est formée par deux surfaces frontales (52a, 57) de forme annulaire, se faisant face de manière axiale et tournées l'une vers l'autre, des deux parois latérales (5b, 6b).
  5. Entraînement à membrane selon l'une quelconque des revendications 2 à 4, caractérisé en ce que les parties faisant saillie de verrouillage (46a) extérieures sont disposées à l'intérieur radialement au niveau d'un tronçon de support (47a) de forme annulaire d'une des parois frontales (5b), et l'autre paroi latérale (6b) supportant les parties faisant saillie de verrouillage (46b) intérieures présente un tronçon de recouvrement (56) de forme annulaire réalisé à la manière d'une bride et dépassant vers l'extérieur, lequel dépasse devant la surface frontale (52a) du tronçon de support (47a).
  6. Entraînement à membrane selon la revendication 5, caractérisé e ce que les parties faisant saillie de verrouillage (46b) intérieures sont disposées à l'extérieur radialement au niveau d'un tronçon de support (47b) de forme annulaire d'une des parois latérales (6b), lequel tronçon de support dépasse de manière coaxiale à l'intérieur du tronçon de support (47a) de forme annulaire de l'autre paroi latérale (5b), dans lequel il est surmonté de manière concentrique vers l'extérieur radialement par le tronçon de recouvrement (56) de forme annulaire.
  7. Entraînement à membrane selon l'une quelconque des revendications 2 à 6, caractérisé en ce que les flancs de verrouillage (54a, 54b) de toutes les parties faisant saillie de verrouillage (46a, 46b) s'étendent sans pente dans un plan perpendiculaire par rapport à l'axe longitudinal (3) du boîtier (2).
  8. Entraînement à membrane selon l'une quelconque des revendications 1 à 7, caractérisé en ce sont disposés, au niveau des deux parois latérales (5b, 6b), des moyens de butée (66) délimitant l'angle de rotation relatif des parties de boîtier (5, 6) lors de l'établissement de la liaison à baïonnette, lesquels provoquent de manière appropriée également un blocage anti-rotation dans le sens inverse lorsque la liaison à baïonnette est établie.
  9. Entraînement à membrane selon la revendication 8, caractérisé en ce que les moyens de butée (66) contiennent une goupille de butée (67) disposée au niveau de l'une (6b) des parois latérales, laquelle coopère, aux fins de la délimitation de l'angle de rotation, avec une surface de butée (72) disposée au niveau de l'autre paroi latérale (5b), dans lequel la goupille de butée (67) peut être introduite dans un évidement de verrouillage (75) de la paroi latérale (6b) présentant la surface de butée (72) afin de bloquer de manière absolue toute torsion des parties de boîtier (5, 6) reliées entre elles par la liaison à baïonnette.
  10. Entraînement à membrane selon l'une quelconque des revendications 1 à 9, caractérisé en ce que le boîtier (2) présente un tronçon central (62) présentant à l'extérieur un contour cylindrique circulaire, auquel se raccorde des deux côtés de manière axiale respectivement un tronçon de surface extérieure (65a, 65b) présentant un contour de forme tronconique.
  11. Entraînement à membrane selon l'une quelconque des revendications 1 à 9, caractérisé en ce que la membrane (13) est enserrée sous une précontrainte axiale entre les deux parois latérales (5b, 6b).
  12. Entraînement à membrane selon l'une quelconque des revendications 1 à 11, caractérisé en ce que deux chambres de travail (15a, 15b) séparées l'une de l'autre par la membrane (13) peuvent être soumises à l'action d'un fluide, et/ou en ce qu'un dispositif à ressort de rappel (33) précontraignant la membrane (13) dans une position de base est disposé dans l'une des chambres de travail (15a).
  13. Entraînement à membrane selon l'une quelconque des revendications 1 à 12, caractérisé en ce qu'il présente au moins un élément de limitation de course (36) de manière préférée de forme annulaire, lequel peut être fixé ou est fixé dans au moins une chambre de travail (15a) au niveau de la surface intérieure de la paroi de terminaison (5a) associée et lequel délimite la course maximale de la membrane (13).
  14. Entraînement à membrane selon l'une quelconque des revendications 1 à 13, caractérisé en ce qu'une des parties de boîtier (5, 6) présente, à l'extérieur au centre, au niveau d'une paroi de terminaison (6a) située côté frontal, une interface de fixation (35) centrale formée en particulier par un trou taraudé coaxial par rapport à l'axe longitudinal (3) du boîtier (2).
  15. Entraînement à membrane selon l'une quelconque des revendications 1 à 14, caractérisé en ce qu'il est équipé de moyens de détection de position (37) servant à détecter au moins une position relative, prise par rapport au boîtier (2), d'une unité d'entraînement (4) comprenant la membrane (13) et le corps de tige (17).
EP12710443.8A 2011-03-31 2012-03-08 Entraînement à membrane actionné par fluide Not-in-force EP2691658B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011015646A DE102011015646A1 (de) 2011-03-31 2011-03-31 Fluidbetätigter Membranantrieb
PCT/EP2012/001023 WO2012130379A1 (fr) 2011-03-31 2012-03-08 Entraînement à membrane actionné par fluide

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EP2691658A1 EP2691658A1 (fr) 2014-02-05
EP2691658B1 true EP2691658B1 (fr) 2017-02-15

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CN (1) CN103443477B (fr)
DE (1) DE102011015646A1 (fr)
WO (1) WO2012130379A1 (fr)

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CN103443477A (zh) 2013-12-11
EP2691658A1 (fr) 2014-02-05
WO2012130379A1 (fr) 2012-10-04
DE102011015646A1 (de) 2012-10-04
CN103443477B (zh) 2016-07-13

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