EP0263199B1 - Membrane compressor - Google Patents

Membrane compressor Download PDF

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Publication number
EP0263199B1
EP0263199B1 EP86114036A EP86114036A EP0263199B1 EP 0263199 B1 EP0263199 B1 EP 0263199B1 EP 86114036 A EP86114036 A EP 86114036A EP 86114036 A EP86114036 A EP 86114036A EP 0263199 B1 EP0263199 B1 EP 0263199B1
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EP
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Prior art keywords
diaphragm
housing
disc
diameter
compressor
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EP86114036A
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German (de)
French (fr)
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EP0263199B2 (en
EP0263199A1 (en
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Brugger Stephan Dipl-Wirt-Ing
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Brugger Stephan Dipl-Wirt-Ing
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Application filed by Brugger Stephan Dipl-Wirt-Ing filed Critical Brugger Stephan Dipl-Wirt-Ing
Priority to AT86114036T priority Critical patent/ATE65299T1/en
Priority to DE8686114036T priority patent/DE3680339D1/en
Priority to DE8626979U priority patent/DE8626979U1/en
Priority to EP86114036A priority patent/EP0263199B2/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
    • F04B45/04—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms

Definitions

  • the invention relates to a membrane compressor with a compressor housing, which is composed of a lower housing part and an upper housing part.
  • a flexible membrane is firmly clamped with its edge between the lower housing part and the upper housing part.
  • the membrane is inserted between a lower membrane plate and an upper membrane plate, the membrane plates having a smaller diameter than the membrane so that it remains flexible in the region of its edge, and the diameter of the upper membrane plate corresponding at least to that of the lower membrane plate.
  • the movement of an eccentric is transferred to the membrane and the membrane plate.
  • the diaphragm, the upper diaphragm plate and the upper part of the housing border a work area, with the upper diaphragm plate reaching almost to the upper inner wall of the upper part of the housing so that a dead space remains, which has the shape of an annular channel and is located in the area above the edge of the diaphragm.
  • a dead space which has the shape of an annular channel and is located in the area above the edge of the diaphragm.
  • In the lower part of the housing there is a piston chamber for receiving the diaphragm and the diaphragm plate at bottom dead center.
  • the working chamber formed in the upper housing part has a larger diameter than the piston chamber in the lower housing part.
  • the diameter of the lower diaphragm plate is noticeably smaller than the diameter of the piston chamber, so that when the bottom dead center is reached, an annular gap remains between the lower diaphragm plate and
  • Membrane compressors of this type are used to convey or compress liquid or gaseous media.
  • the drive power is between 1 W and approx. 3 kW.
  • smaller membrane compressors with drive powers up to approximately 200 W are often used as drive or actuation units for devices in the medical field, for example they serve as pumps for inhalers.
  • Small diaphragm compressors which are manufactured in large numbers, should be characterized by the simplest possible construction. Another requirement that comes from practice is absolute insensitivity to overload, for example if the compressor outlet is shut off by locking. The pressure built up inside the work area can reach up to several times the normal operating pressure. Although normally no such loads are provided at all, the diaphragm compressor must nevertheless be able to withstand this stress. Especially in the case of small, large-volume membrane compressors, efforts will be made to avoid additional complex protective measures, for example in the form of a safety valve, and instead to design the compressor to be structurally overpressure-proof.
  • a membrane compressor of the type mentioned is known from FR-A-744 350.
  • the diaphragm of this pump is driven by a piston, which is under the action of strong springs.
  • the space around the spring pressing on the upper diaphragm plate is connected to the work space in which compression is carried out.
  • the overall result is a large, intricately shaped dead space above the flexible membrane, which impairs the efficiency.
  • This previously known diaphragm pump is also characterized by a very complex construction.
  • the upper housing part which, together with the flexible membrane, delimits the working space, has a very complicated shape and is therefore expensive to manufacture.
  • the object of the present invention is to provide a membrane compressor of a very simple construction and thus inexpensive to produce, in which the maximum pressure which occurs is automatically limited to an uncritical value without the provision of special components, without compromising on the efficiency under normal operating conditions .
  • a diaphragm compressor of the type mentioned at the outset is used as the starting point.
  • the object is achieved in that a connecting rod driven by the eccentric is fixedly connected to the diaphragm and the diaphragm plates in order to jointly move them in one stroke to offset that the upper housing part has an upper inner wall which is flat in the area of the upper diaphragm plate, and further in that the free end of the connecting rod is fastened to the diaphragm and the diaphragm plates by means of a countersunk screw.
  • the drive by means of a connecting rod, which is firmly connected to the membrane and the diaphragm plates, represents a significant design simplification of the diaphragm compressor according to the invention.
  • the also completely flat, above re diaphragm plate can be moved up almost to the flat inner wall of the upper housing part, so that the necessary dead space is essentially formed by an annular channel around the edge of the upper diaphragm plate.
  • the flexible diaphragm can move down into the annular gap between the lower diaphragm plate and the edge of the lower part of the housing and thus functions as an automatic overpressure protection. Special, additional safety measures against overpressure are therefore unnecessary.
  • the top diaphragm plate comes to lie on the inner wall of the upper part of the housing up to a gap of approx. 0.1 mm at the top dead center. This dimensioning takes into account the manufacturing tolerances that are unavoidable in large series production and reliably prevents the upper diaphragm plate from striking the inner wall of the upper housing part.
  • An embodiment is also preferred in which the diameters of the lower membrane plate and the upper membrane plate are the same.
  • a circumferential groove is expediently provided in the upper housing part, which receives the edge of the membrane.
  • the elastic membrane is held in its intended position in this groove in the pressed state.
  • the membrane compressor shown in Fig. 1 has a compressor housing (1) which is composed of a lower housing part (2) and an upper housing part (3).
  • a circumferential groove (4) is provided in the housing upper part (3), which receives a membrane (5) made of a flexible material, for example rubber, with its edge (6).
  • the membrane (5) is held in position within the groove (4) by pressing between the lower housing part (2) and the upper housing part (3).
  • the two diaphragm plates (7, 8) are torsionally rigid, so that the interposed diaphragm (5) remains elastically deformable only in the area of its edge (6).
  • the diaphragm compressor is driven by a motor (not shown).
  • An eccentric (10) is slid onto its motor shaft (9). The eccentric rotary movement is transmitted to a connecting rod (12) via a bearing (11).
  • the free end of the connecting rod (12) is connected to the lower diaphragm plate (7), the upper diaphragm plate (8) and the interposed diaphragm (5) via an intermediate disc (13).
  • a countersunk screw (14) ensures that the diaphragm plate (7, 8) and diaphragm (5) are securely attached to the connecting rod (12).
  • a working space (15) is delimited by the uncovered areas of the membrane (5), the upper membrane plate (8) and the upper housing part (3).
  • the medium to be compressed for example gas
  • enters the working space (15) which it leaves through an outlet (17) after compression.
  • a piston chamber (18) is divided by the membrane (5) from the working chamber (15), which is essentially embedded in the lower housing part (2). At the bottom dead center, this piston chamber (18) receives the diaphragm (5) and the diaphragm plate (7, 8).
  • This dead space (19) denotes the dead space in which compressed medium remains when the upper diaphragm plate (8) comes to rest on the flat inner wall of the upper housing part (3) up to a gap of approx. 0.1 mm in the top dead center.
  • This dead space (19) has the shape of an annular channel and is located in the region of the edge (6) of the membrane.
  • the diameter of the lower membrane plate (7) and that of the upper membrane plate (8) are approximately the same size.
  • the diameter of the working chamber (15) is larger than the diameter of the piston chamber (18). This dimensioning results in a position of the dead space (19) which is displaced outward in the radial direction. If the pressure of the compressed medium in the dead space (19) reaches a certain critical value, the membrane (5) can move downwards into the annular gap (20) between the lower housing part (2) and the lower membrane plate (7), which automatically causes a pressure limitation . Dangerous pressure peaks can therefore no longer occur even if, for example, the outlet (17) is completely shut off.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Compressor (AREA)
  • Diaphragms And Bellows (AREA)

Abstract

A diaphragm compressor has a compressor housing (1) comprising a bottom section (2) and an upper section (3). A flexible diaphragm (5) is inserted between a bottom diaphragm disc (7) and an upper diaphragm disc (8) and projects laterally. The diaphragm (5) is firmly clamped by its edge (6) between the bottom section (2) and upper section (3) of the housing. A connecting rod (12) produces a lifting motion of the diaphragm (5) and the adjacent diaphragm discs (7, 8). This compresses a medium in a working chamber (15). Below the diaphragm (5) is a piston chamber (18) in the lower section (2) of the housing. The diameter of the working chamber (15) formed in the upper section (3) of the housing has a greater diameter than the piston chamber (18). The diameter of the bottom diaphragm disc (7) is distinctly smaller than the diameter of the piston chamber (18). As a result an annular gap (20) is left between the bottom diaphragm disc (7) and the opposing inside wall of the bottom section (2) of the housing. The diameter of the upper diaphragm disc (8) is thereby at least equal to that of the bottom diaphragm disc (7). The clearance (19) produced at the top dead centre between the upper section (3) of the housing, diaphragm (5) and upper diaphragm disc (8) takes the form of an annular duct and is greatly offset outward in a radial direction in the area of the edge (6) of the diaphragm (5). The proposed diaphragm compressor is outstanding by virtue of an improved characteristic behaviour. The increase in pressure given a reduction in the volume flow occurs much more slowly; the fluctuation in the maximum pressure which can be generated in the working chamber (15) is much less. <IMAGE>

Description

Die Erfindung betrifft einen Membrankompressor mit einem Verdichtergehäuse, das zusammengesetzt ist aus einem Gehäuseunterteil und einem Gehäuseoberteil. Eine flexible Membran ist mit ihrem Rand zwischen Gehäuseunterteil und Gehäuseoberteil fest eingespannt. Zwecks Versteifung ist die Membran zwischen einem unteren Membranteller und einem oberen Membranteller eingelegt, wobei die Membranteller geringeren Durchmesser als die Membran aufweisen, damit diese im Bereich ihres Randes flexibel bleibt, und wobei der Durchmesser des oberen Membrantellers mindestens demjenigen des unteren Membrantellers entspricht. Die Bewegung eines Exzenters wird auf die Membran und die Membranteller übertragen. Membran, oberer Membranteller und Gehäuseoberteil umgrenzen einen Arbeitsraum, wobei im oberen Totpunkt der obere Membranteller bis fast an die obere Innenwand des Gehäuseoberteils heranreicht, so daß ein Totraum verbleibt, die der Form eines Ringkanals hat und sich im Bereich über dem Rand der Membran befindet. Es ist ferner ein Einlaß und ein Auslaß für das zu verdichtende Medium vorgesehen, welche mit dem Arbeitsraum in Verbindung stehen. Im Gehäuseunterteil findet sich ein Kolbenraum zur Aufnahme der Membran und der Membranteller im unteren Totpunkt. Der im Gehäuseoberteil ausgebildete Arbeitsraum weist einen größeren Durchmesser auf als der Kolbenraum im Gehäuseunterteil. Der Durchmesser des unteren Membrantellers ist merklich kleiner als der Durchmesser des Kolbenraums, so daß bei Erreichen des unteren Totpunkts ein Ringspalt zwischen dem unteren Membranteller und der gegenüberliegenden Innenwand des Gehäuseunterteils verbleibt.The invention relates to a membrane compressor with a compressor housing, which is composed of a lower housing part and an upper housing part. A flexible membrane is firmly clamped with its edge between the lower housing part and the upper housing part. For the purpose of stiffening, the membrane is inserted between a lower membrane plate and an upper membrane plate, the membrane plates having a smaller diameter than the membrane so that it remains flexible in the region of its edge, and the diameter of the upper membrane plate corresponding at least to that of the lower membrane plate. The movement of an eccentric is transferred to the membrane and the membrane plate. The diaphragm, the upper diaphragm plate and the upper part of the housing border a work area, with the upper diaphragm plate reaching almost to the upper inner wall of the upper part of the housing so that a dead space remains, which has the shape of an annular channel and is located in the area above the edge of the diaphragm. There is also an inlet and an outlet for the medium to be compressed, which are connected to the working space. In the lower part of the housing there is a piston chamber for receiving the diaphragm and the diaphragm plate at bottom dead center. The working chamber formed in the upper housing part has a larger diameter than the piston chamber in the lower housing part. The diameter of the lower diaphragm plate is noticeably smaller than the diameter of the piston chamber, so that when the bottom dead center is reached, an annular gap remains between the lower diaphragm plate and the opposite inner wall of the lower housing part.

Derartige Membrankompressoren werden zum Fördern oder Verdichten von flüssigen oder gasförmigen Medien eingesetzt. Je nach Bauart beträgt die Antriebsleistung zwischen 1 W und ca. 3 kW. Insbesondere kleinere Membrankompressoren mit Antriebsleistungen bis ungefähr 200 W werden häufig als Antriebs- oder Betätigungseinheit für Geräte im medizintechnischen Bereich eingesetzt, beispielsweise dienen sie als Pumpen für Inhalatoren.Membrane compressors of this type are used to convey or compress liquid or gaseous media. Depending on the design, the drive power is between 1 W and approx. 3 kW. In particular, smaller membrane compressors with drive powers up to approximately 200 W are often used as drive or actuation units for devices in the medical field, for example they serve as pumps for inhalers.

Kleine Membrankompressoren, die in hohen Stückzahlen hergestellt werden, sollen sich durch möglichst einfache Konstruktion auszeichnen. Eine weitere, aus der Praxis kommende Forderung ist absolute Unempfindlichkeit gegen Überlast, beispielsweise im Falle des Absperrens des Auslasses des Kompressors durch Zuhalten. Der dabei innerhalb des Arbeitsraums aufgebaute Druck kann bis zum Mehrfachen des normalen Betriebsdruckes erreichen. Obwohl im Normalfall derartige Belastungen überhaupt nicht vorgesehen sind, muß dennoch der Membrankompressor diese Beanspruchung aushalten können. Gerade bei kleinen, in Großserie gebauten Membrankompressoren wird man bemüht sein, zusätzliche aufwendige Schutzmaßnahmen, beispielsweise in Form eines Sicherheitsventils, zu vermeiden, und statt dessen den Kompressor bereits konstruktiv überdrucksicher auszulegen.Small diaphragm compressors, which are manufactured in large numbers, should be characterized by the simplest possible construction. Another requirement that comes from practice is absolute insensitivity to overload, for example if the compressor outlet is shut off by locking. The pressure built up inside the work area can reach up to several times the normal operating pressure. Although normally no such loads are provided at all, the diaphragm compressor must nevertheless be able to withstand this stress. Especially in the case of small, large-volume membrane compressors, efforts will be made to avoid additional complex protective measures, for example in the form of a safety valve, and instead to design the compressor to be structurally overpressure-proof.

Ein Membrankompressor der eingangs genannten Art ist aus der FR-A-744 350 bekannt. Die Membran dieser Pumpe wird über einen Kolben angetrieben, der unter der Wirkung starker Federn steht. Der Raum um die auf den oberen Membranteller drückende Feder steht mit dem Arbeitsraum, in dem verdichtet wird, in Verbindung. Es ergibt sich somit insgesamt ein großer, kompliziert geformter Totraum über der flexiblen Membran, was den Wirkungsgrad beeinträchtigt. Diese vorbekannte Membranpumpe zeichnet sich ferner durch eine sehr aufwendige Konstruktion aus. Insbesondere ist das Gehäuseoberteil, das gemeinsam mit der flexiblen Membran den Arbeitsraum umgrenzt, sehr kompliziert geformt und damit teuer in der Herstellung.A membrane compressor of the type mentioned is known from FR-A-744 350. The diaphragm of this pump is driven by a piston, which is under the action of strong springs. The space around the spring pressing on the upper diaphragm plate is connected to the work space in which compression is carried out. The overall result is a large, intricately shaped dead space above the flexible membrane, which impairs the efficiency. This previously known diaphragm pump is also characterized by a very complex construction. In particular, the upper housing part, which, together with the flexible membrane, delimits the working space, has a very complicated shape and is therefore expensive to manufacture.

Aus der FR-A-392 356 ist ferner eine Pumpe mit zwei antiparallel bewegten Membranen bekannt. Der Antrieb erfolgt über Schiebestangen.From FR-A-392 356 a pump with two anti-parallel moving membranes is also known. The drive takes place via push rods.

Aufgabe der vorliegenden Erfindung ist es, einen sehr einfach aufgebauten und somit kostengünstig herzustellenden Membrankompressor zu schaffen, bei dem der maximal auftretende Druck automatisch und ohne Vorsehen spezieller Bauelemente auf einen unkritischen Wert begrenzt ist, ohne daß bei normalen Betriebsverhältnissen Abstriche hinsichtlich des Wirkungsgrades hingenommen werden müßten.The object of the present invention is to provide a membrane compressor of a very simple construction and thus inexpensive to produce, in which the maximum pressure which occurs is automatically limited to an uncritical value without the provision of special components, without compromising on the efficiency under normal operating conditions .

Bei der Lösung dieser Aufgabe wird gemäß dem Oberbegriff des Patentanspruchs 1 ausgegangen von einem Membrankompressor der eingangs erwähnten Art. Gelöst wird die Aufgabe dadurch, daß mit der Membran und den Membrantellern ein von dem Exzenter angetriebenes Pleuel fest verbunden ist, um diese gemeinsam in eine Hubbewegung zu versetzen, daß das Gehäuseoberteil eine im Bereich des oberen Membrantellers durchgehend eben ausgebildete obere Innenwand aufweist, und ferner dadurch, daß das freie Ende des Pleuels mittels einer Senkkopfschraube an der Membran und den Membrantellern befestigt ist.In solving this problem, a diaphragm compressor of the type mentioned at the outset is used as the starting point. The object is achieved in that a connecting rod driven by the eccentric is fixedly connected to the diaphragm and the diaphragm plates in order to jointly move them in one stroke to offset that the upper housing part has an upper inner wall which is flat in the area of the upper diaphragm plate, and further in that the free end of the connecting rod is fastened to the diaphragm and the diaphragm plates by means of a countersunk screw.

Der Antrieb mittels eines Pleuels, das fest mit der Membran und den Membrantellern verbunden ist, stellt eine wesentliche konstruktive Vereinfachung des erfindungsgemäßen Membrankompressors dar. Das Gehäuseoberteil mit durchgehend eben ausgebildeter oberer Innenwand läßt sich einfach und kostengünstig als Druckgußteil herstellen. Der ebenfalls vollkommen flach ausgebildete, obere Membranteller läßt sich im oberen Totpunkt bis fast an die ebene Innenwand des Gehäuseoberteils hinauf bewegen, so daß der notwendigerweise verbleibende Totraum im wesentlichen durch einen Ringkanal rings um den Rand des oberen Membrantellers gebildet wird. Bei Erreichen des maximal zulässigen Druckes in diesem Totraum kann die flexible Membran nach unten in den Ringspalt zwischen unterem Membranteller und Rand des Gehäuseunterteils ausweichen und funktioniert somit als automatischer Überdruckschutz. Besondere, zusätzliche Sicherheitsmaßnahmen gegen Überdruck sind somit entbehrlich. Die Befestigung des freien Endes des Pleuels an der Membran mittels einer Senkkopfschraube ergibt die gewünschte ebene Ausbildung der Oberseite des oberen Membrantellers, welche Voraussetzung für die in radialer Richtung weit nach außen verschobene Lage des Totraums ist. Hierdurch ergibt sich eine verflachte Druck-Volumenstrom-Kennlinie. Ein weiterer wesentlicher Vorteil des erfindungsgemäßen Membrankompressors liegt darin, daß aufgrund der einfachen Konstruktion hinsichtlich der Streubereich der Druck-Volumenstrom-Kennlinie stark eingeengt ist.The drive by means of a connecting rod, which is firmly connected to the membrane and the diaphragm plates, represents a significant design simplification of the diaphragm compressor according to the invention. The also completely flat, above re diaphragm plate can be moved up almost to the flat inner wall of the upper housing part, so that the necessary dead space is essentially formed by an annular channel around the edge of the upper diaphragm plate. When the maximum permissible pressure in this dead space is reached, the flexible diaphragm can move down into the annular gap between the lower diaphragm plate and the edge of the lower part of the housing and thus functions as an automatic overpressure protection. Special, additional safety measures against overpressure are therefore unnecessary. The attachment of the free end of the connecting rod to the diaphragm by means of a countersunk screw results in the desired flat design of the upper side of the upper diaphragm plate, which is a prerequisite for the position of the dead space that is displaced radially outward in the radial direction. This results in a flattened pressure-volume flow characteristic. Another significant advantage of the diaphragm compressor according to the invention is that, due to the simple construction, the pressure-volume flow characteristic is very narrow with regard to the scattering range.

Bei einer bevorzugten Ausführung des erfindungsgemäßen Membrankompressors kommt im oberen Totpunkt der obere Membranteller bis auf einen Spalt von ca. 0,1 mm an die Innenwand des Gehäuseoberteils zu liegen. Diese Dimensionierung trägt den bei einer Großserienfertigung unvermeidlichen Fertigungstoleranzen Rechnung und verhindert zuverlässig ein Anschlagen des oberen Membrantellers an der Innenwand des Gehäuseoberteils.In a preferred embodiment of the diaphragm compressor according to the invention, the top diaphragm plate comes to lie on the inner wall of the upper part of the housing up to a gap of approx. 0.1 mm at the top dead center. This dimensioning takes into account the manufacturing tolerances that are unavoidable in large series production and reliably prevents the upper diaphragm plate from striking the inner wall of the upper housing part.

Bevorzugt wird ferner eine Ausführung, bei der die Durchmesser des unteren Membrantellers und des oberen Membrantellers gleich sind.An embodiment is also preferred in which the diameters of the lower membrane plate and the upper membrane plate are the same.

Zweckmäßigerweise ist im Gehäuseoberteil eine umlaufende Nut vorgesehen, welche den Rand der Membran aufnimmt. In dieser Nut wird die elastische Membran in gepreßtem Zustand in ihrer vorgesehenen Lage gehalten.A circumferential groove is expediently provided in the upper housing part, which receives the edge of the membrane. The elastic membrane is held in its intended position in this groove in the pressed state.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der beigefügten Zeichnung näher erläutert. Die einzige Abbildung zeigt einen Membrankompressor in einem Längsschnitt durch das Verdichtergehäuse, in vergrößertem Maßstab.An embodiment of the invention is explained below with reference to the accompanying drawings. The only illustration shows a diaphragm compressor in a longitudinal section through the compressor housing, on an enlarged scale.

Der in Fig. 1 dargestellte Membrankompressor besitzt ein Verdichtergehäuse (1), das aus einem Gehäuseunterteil (2) und einem Gehäuseoberteil (3) zusammengesetzt ist. Im Gehäuseoberteil (3) ist eine ringsumlaufende Nut (4) vorgesehen, welche eine Membran (5) aus einem flexiblen Material, beispielsweise Gummi, mit ihrem Rand (6) aufnimmt. Die Membran (5) wird durch Pressung zwischen dem Gehäuseunterteil (2) und dem Gehäuseoberteil (3) in ihrer Lage innerhalb der Nut (4) festgehalten. Zu beiden Seiten der Membran (5) liegt ein unterer Membranteller (7) bzw. ein oberer Membranteller (8) an. Die beiden Membranteller (7, 8) sind verwindungssteif, so daß die zwischengelegte Membran (5) lediglich im Bereich ihres Randes (6) elastisch verformbar bleibt.The membrane compressor shown in Fig. 1 has a compressor housing (1) which is composed of a lower housing part (2) and an upper housing part (3). A circumferential groove (4) is provided in the housing upper part (3), which receives a membrane (5) made of a flexible material, for example rubber, with its edge (6). The membrane (5) is held in position within the groove (4) by pressing between the lower housing part (2) and the upper housing part (3). On both sides of the membrane (5) there is a lower membrane plate (7) or an upper membrane plate (8). The two diaphragm plates (7, 8) are torsionally rigid, so that the interposed diaphragm (5) remains elastically deformable only in the area of its edge (6).

Der Membrankompressor wird von einem (nicht dargestellten) Motor angetrieben. Auf dessen Motorwelle (9) ist ein Exzenter (10) aufgeschoben. Die exzentrische Drehbewegung wird über ein Lager (11) auf ein Pleuel (12) übertragen.The diaphragm compressor is driven by a motor (not shown). An eccentric (10) is slid onto its motor shaft (9). The eccentric rotary movement is transmitted to a connecting rod (12) via a bearing (11).

Über eine Zwischenscheibe (13) ist das freie Ende des Pleuels (12) mit dem unteren Membranteller (7), dem oberen Membranteller (8) sowie der zwischengelegten Membran (5) verbunden. Eine Senkkopfschraube (14) sorgt für eine sichere Befestigung der Membranteller (7, 8) und der Membran (5) am Pleuel (12). Bei Drehung der Motorwelle (9) wird der mittlere Bereich der Membran (5) mit den beidseitig anliegenden Membrantellern (7, 8) kolbenartig in eine nahezu senkrechte Hubbewegung versetzt.The free end of the connecting rod (12) is connected to the lower diaphragm plate (7), the upper diaphragm plate (8) and the interposed diaphragm (5) via an intermediate disc (13). A countersunk screw (14) ensures that the diaphragm plate (7, 8) and diaphragm (5) are securely attached to the connecting rod (12). When the motor shaft (9) rotates, the central area of the diaphragm (5) with the diaphragm plates (7, 8) on both sides is set in a piston-like manner in an almost vertical stroke movement.

Von den nichtabgedeckten Bereichen der Membran (5), dem oberen Membranteller (8) und dem Gehäuseoberteil (3) wird ein Arbeitsraum (15) umgrenzt. Über einen Einlaß (16) gelangt das zu verdichtende Medium, beispielsweise Gas, in den Arbeitsraum (15), welchen es durch einen Auslaß (17) nach erfolgter Verdichtung wieder verläßt. Ein Kolbenraum (18) ist durch die Membran (5) vom Arbeitraum (15) abgeteilt, welcher im wesentlichen im Gehäuseunterteil (2) eingelassen ist. Im unteren Totpunkt nimmt dieser Kolbenraum (18) die Membran (5) und die Membranteller (7, 8) auf.A working space (15) is delimited by the uncovered areas of the membrane (5), the upper membrane plate (8) and the upper housing part (3). Via an inlet (16), the medium to be compressed, for example gas, enters the working space (15), which it leaves through an outlet (17) after compression. A piston chamber (18) is divided by the membrane (5) from the working chamber (15), which is essentially embedded in the lower housing part (2). At the bottom dead center, this piston chamber (18) receives the diaphragm (5) and the diaphragm plate (7, 8).

Mit 19 ist der Totraum bezeichnet, in welchem verdichtetes Medium zurückbleibt, wenn im oberen Totpunkt der obere Membranteller (8) bis auf einen Spalt von ca. 0,1 mm an die ebene Innenwand des Gehäuseoberteils (3) zu liegen kommt. Dieser Totraum (19) hat die Form eines Ringkanals und befindet sich im Bereich des Randes (6) der Membran.19 denotes the dead space in which compressed medium remains when the upper diaphragm plate (8) comes to rest on the flat inner wall of the upper housing part (3) up to a gap of approx. 0.1 mm in the top dead center. This dead space (19) has the shape of an annular channel and is located in the region of the edge (6) of the membrane.

Der Durchmesser des unteren Membrantellers (7) und derjenige des oberen Membrantellers (8) sind etwa gleich groß. Der Durchmesser des Arbeitsraumes (15) ist größer als der Durchmesser des Kolbenraums (18). Diese Dimensionierung ergibt eine in radialer Richtung nach außen verschobene Lage des Totraums (19). Erreicht der Druck des verdichteten Mediums im Totraum (19) einen bestimmten kritischen Wert, so kann die Membran (5) nach unten in den Ringspalt (20) zwischen Gehäuseunterteil (2) und unterem Membranteller (7) ausweichen, wodurch automatisch eine Druckbegrenzung bewirkt wird. Gefährliche Druckspitzen können somit auch dann nicht mehr auftreten, wenn beispielsweise der Auslaß (17) vollständig abgesperrt ist.The diameter of the lower membrane plate (7) and that of the upper membrane plate (8) are approximately the same size. The diameter of the working chamber (15) is larger than the diameter of the piston chamber (18). This dimensioning results in a position of the dead space (19) which is displaced outward in the radial direction. If the pressure of the compressed medium in the dead space (19) reaches a certain critical value, the membrane (5) can move downwards into the annular gap (20) between the lower housing part (2) and the lower membrane plate (7), which automatically causes a pressure limitation . Dangerous pressure peaks can therefore no longer occur even if, for example, the outlet (17) is completely shut off.

Claims (4)

1. A diaphragm compressor comprising
- a compressor housing (1) which is composed of a housing lower part (2) and a housing upper part (3);
- a flexible diaphragm (5), the edge (6) of which is firmly clamped between the housing lower part (2) and the housing upper part (3);
- a lower diaphragm disc (7) and an upper diaphragm disc (8), between which the diaphragm (5) is inserted in order to be rendered rigid, where the diaphragm discs (7, 8) possess a smaller diameter than the diaphragm (5) in order that the diaphragm remains flexible in the region of its edge (6), and where the diameter of the upper diaphragm disc (8) at least corresponds to that of the lower diaphragm disc (7);
- an eccentric (10), the movement of which is transmitted to the diaphragm (5) and the diaphragm discs (7, 8);
- a working chamber (15) which is defined by the diaphragm (5) , the upper diaphragm disc (8) and the housing upper part (3), where at the upper dead centre the upper diaphragm disc (8) extends almost to the upper inner wall of the housing upper part (3) so that a dead space (19) remains which has the form of an annular channel and is located in the region above the edge (6) of the diaphragm (5);
- an inlet (16) and an outlet (17) for the medium which is to be compressed, which are connected to the working chamber (15);
- a piston chamber (18) in the housing lower part (2) which accommodates the diaphragm (5) and the diaphragm discs (7, 8) at the lower dead centre, where the working chamber (15), which is formed in the housing upper part (3), has a larger diameter than the piston chamber (18) and where the diameter of the lower diaphragm disc (7) is noticeably smaller than the diameter of the piston chamber (18) so that an annular gap (20) remains between the lower diaphragam disc (7) and the opposite inner wall of the housing lower part (2),
characterised in that
- the diaphragm (5) and the diaphragm discs (7, 8) are permanently connected to a connecting rod (12), which is driven by the eccentric (10), in order to impart a common reciprocating movement to said diaphragm and diaphragm discs;
- the housing upper part (3) comprises a continuously flat, upper inner wall in the region of the upper diaphragm disc (8);
- the free end of the connecting rod (12) is attached to the diaphragm (5) and the diaphragm discs (7, 8) by means of a countersunk screw (14).
2. A diaphragm compressor as claimed in Claim 1, characterised in that at the upper dead centre the upper diaphragm disc (8) abuts against the inner wall of the housing upper part (3) leaving a gap of approximately 0.1 mm.
3. A diaphragm compressor as claimed in Claim 1 or 2, characterised in that the diameters of the lower diaphragm disc (7) and the upper diaphragm disc (8) are equal.
4. A diaphragm compressor as claimed in one of Claims 1 to 3, characterised in that a peripheral groove (4), which accommodates the edge (6) of the diaphragm (5), is arranged in the housing upper part (3).
EP86114036A 1986-10-10 1986-10-10 Membrane compressor Expired - Lifetime EP0263199B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT86114036T ATE65299T1 (en) 1986-10-10 1986-10-10 DIAPHRAGM COMPRESSOR.
DE8686114036T DE3680339D1 (en) 1986-10-10 1986-10-10 MEMBRANE COMPRESSOR.
DE8626979U DE8626979U1 (en) 1986-10-10 1986-10-10 Diaphragm compressor
EP86114036A EP0263199B2 (en) 1986-10-10 1986-10-10 Membrane compressor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP86114036A EP0263199B2 (en) 1986-10-10 1986-10-10 Membrane compressor

Publications (3)

Publication Number Publication Date
EP0263199A1 EP0263199A1 (en) 1988-04-13
EP0263199B1 true EP0263199B1 (en) 1991-07-17
EP0263199B2 EP0263199B2 (en) 1995-10-04

Family

ID=8195489

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86114036A Expired - Lifetime EP0263199B2 (en) 1986-10-10 1986-10-10 Membrane compressor

Country Status (3)

Country Link
EP (1) EP0263199B2 (en)
AT (1) ATE65299T1 (en)
DE (1) DE3680339D1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR744350A (en) * 1933-04-14
FR392356A (en) * 1908-07-16 1908-11-25 Martin Falk Improvements to diaphragm vacuum pumps
US3947156A (en) * 1972-03-08 1976-03-30 Erich Becker Diaphragm pump, particularly for the generation of vacuum
DE8626979U1 (en) * 1986-10-10 1986-11-20 Brugger, Stephan, Dipl.-Wirtsch.-Ing.(FH), 8137 Berg Diaphragm compressor

Also Published As

Publication number Publication date
EP0263199B2 (en) 1995-10-04
ATE65299T1 (en) 1991-08-15
EP0263199A1 (en) 1988-04-13
DE3680339D1 (en) 1991-08-22

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