EP0263199B2 - Compresseur à membrane - Google Patents

Compresseur à membrane Download PDF

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Publication number
EP0263199B2
EP0263199B2 EP86114036A EP86114036A EP0263199B2 EP 0263199 B2 EP0263199 B2 EP 0263199B2 EP 86114036 A EP86114036 A EP 86114036A EP 86114036 A EP86114036 A EP 86114036A EP 0263199 B2 EP0263199 B2 EP 0263199B2
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EP
European Patent Office
Prior art keywords
diaphragm
housing portion
disc
diameter
housing
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.)
Expired - Lifetime
Application number
EP86114036A
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German (de)
English (en)
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EP0263199A1 (fr
EP0263199B1 (fr
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Individual
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Individual
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Application filed by Individual filed Critical Individual
Priority to DE8686114036T priority Critical patent/DE3680339D1/de
Priority to DE8626979U priority patent/DE8626979U1/de
Priority to AT86114036T priority patent/ATE65299T1/de
Priority to EP86114036A priority patent/EP0263199B2/fr
Publication of EP0263199A1 publication Critical patent/EP0263199A1/fr
Application granted granted Critical
Publication of EP0263199B1 publication Critical patent/EP0263199B1/fr
Publication of EP0263199B2 publication Critical patent/EP0263199B2/fr
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Classifications

    • 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 placed between a lower membrane plate and an upper membrane plate, the membrane plates having a smaller diameter than the membrane, so that the membrane remains flexible in the area of its edge. 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 delimit a working space, 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
  • 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 membrane compressors which are manufactured in large numbers, should be characterized by the simplest possible design. 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, the diaphragm compressor must be able to withstand these loads. Especially in the case of small, large-volume diaphragm 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, complicatedly 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 is shared with The flexible membrane delimits the work area, has a very complicated shape and is therefore expensive to manufacture.
  • Vacuum membrane pumps are also known which also have the features mentioned at the outset (DE-C-1 184 447 and DE-A-2 102 957). These pumps have an eccentric drive with a connecting rod driven by the eccentric, via which the eccentric is firmly connected to the diaphragm and the diaphragm plates.
  • the working chamber formed in the upper part of the housing has approximately the same diameter as the piston chamber in the lower part of the housing.
  • the object of the invention is to provide a very simply constructed and thus inexpensive to manufacture diaphragm compressor, in which the maximum pressure occurring is automatically limited to a non-critical value without the provision of special components, without sacrificing efficiency in normal operating conditions. This object is achieved by the features specified in claim 1.
  • the drive by means of a connecting rod, which is firmly connected to the membrane and the diaphragm plates, represents an essential design simplification of the diaphragm compressor according to the invention.
  • the upper diaphragm plate which is also completely flat, can be almost at the top dead center up to the flat inner wall of the Move the upper part of the housing upwards, so that the dead space that is necessarily left 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 housing part 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.
  • 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 upper housing 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 membrane compressor is driven by a motor (not shown).
  • An eccentric (10) is pushed 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 plates (7, 8) and the 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 via an inlet (16) the work 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 at 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) displaced outward in the radial direction. If the pressure of the compressed medium in the dead space (19) reaches a certain critical value, the diaphragm (5) can move downwards into the annular gap (20) between the lower housing part (2) and the lower diaphragm 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.

Landscapes

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

Claims (3)

  1. Compresseur à membrane, comportant:
    a) un boîtier de refoulement (1) qui est constitué de l'assemblage d'une pièce de boîtier inférieure (2) et d'une pièce de boîtier supérieure (3);
    b) une membrane flexible (5) dont le bord (6) est fermement serré entre la pièce de boîtier inférieure (2) et la pièce de boîtier supérieure (3);
    c) une coupelle inférieure de membrane (7) et une coupelle supérieure de membrane (8), entre lesquelles la membrane (5) est disposée pour être renforcée, les coupelles de membrane (7, 8) présentant un diamètre plus petit que celui de la membrane (5), pour que celle-ci reste flexible dans la région de son bord (6);
    d) un excentrique (10) et une bielle (12) entraînée par celui-ci et par l'intermédiaire de laquelle l'excentrique est relié fermement à la membrane (5) et aux coupelles de membrane (7, 8), pour les déplacer ensemble selon un mouvement en va-et-vient;
    e) une chambre de travail (15) qui est délimitée par la membrane (5), la coupelle supérieure de membrane (8) et la pièce de boîtier supérieure (3), dans laquelle au point mort haut la coupelle supérieure de membrane (8) atteint presque la paroi intérieure supérieure de la pièce de boîtier supérieure (3), de sorte qu'il reste un espace mort (19) qui présente la forme d'un canal annulaire et qui se trouve dans la région située au-dessus du bord (6) de la membrane (5);
    f) une entrée (16) et une sortie (17) pour le fluide à refouler, qui sont en communication avec la chambre de travail (15);
    g) une chambre de piston (18) dans la pièce de boîtier inférieure (2), pour la réception de la membrane (5) et des coupelles de membrane (7, 8) au point mort bas, dans laquelle le diamètre de la coupelle inférieure de membrane (7) est largement plus petit que le diamètre de la chambre de piston (18), de sorte qu'il reste un interstice annulaire (20) entre la coupelle inférieure de membrane (7) et la paroi intérieure opposée de la pièce de boîtier inférieure (2),
    h) tandis que la pièce de boîtier supérieure (3) présente une paroi intérieure supérieure configurée plane sur toute la région de la coupelle supérieure de membrane (8), et
    i) l'extrémité libre de la bielle (12) est fixée à la membrane (5) et à la coupelle de membrane (8) par une vis à tête fraisée,
    k) caractérisé en ce que la chambre de travail configurée dans la pièce de boîtier supérieure (3) présente un diamètre plus grand que la chambre de piston (18),
    l) le diamètre de la coupelle supérieure et celui de la coupelle inférieure de membrane (7, 8) sont de même valeur, et
    m) la membrane (5) est serrée et élastiquement déformable de telle sorte que, lorsqu'une pression définie est atteinte dans l'espace mort (19) dans l'interstice annulaire (20) situé entre la coupelle inférieure de membrane (7) et la paroi intérieure opposée de la pièce de boîtier inférieure (2), elle se déforme vers l'intérieur pour limiter la pression.
  2. Compresseur à membrane selon la revendication 1, caractérisé en ce qu'au point mort supérieur, la coupelle supérieure de membrane (8) vient se placer sur la paroi intérieure de la pièce de boîtier supérieure (3) avec un interstice d'environ 0,1 mm.
  3. Compresseur à membrane selon l'une des revendications 1 et 2, caractérisé en ce qu'une rainure périphérique (4) est prévue dans la pièce de boîtier supérieure (3), qui reçoit le bord (6) de la membrane (5).
EP86114036A 1986-10-10 1986-10-10 Compresseur à membrane Expired - Lifetime EP0263199B2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE8686114036T DE3680339D1 (de) 1986-10-10 1986-10-10 Membrankompressor.
DE8626979U DE8626979U1 (de) 1986-10-10 1986-10-10 Membrankompressor
AT86114036T ATE65299T1 (de) 1986-10-10 1986-10-10 Membrankompressor.
EP86114036A EP0263199B2 (fr) 1986-10-10 1986-10-10 Compresseur à membrane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP86114036A EP0263199B2 (fr) 1986-10-10 1986-10-10 Compresseur à membrane

Publications (3)

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

Family

ID=8195489

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86114036A Expired - Lifetime EP0263199B2 (fr) 1986-10-10 1986-10-10 Compresseur à membrane

Country Status (3)

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

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR744350A (fr) * 1933-04-14
FR392356A (fr) * 1908-07-16 1908-11-25 Martin Falk Perfectionnements apportés aux pompes à vide à membrane
US3947156A (en) * 1972-03-08 1976-03-30 Erich Becker Diaphragm pump, particularly for the generation of vacuum
DE8626979U1 (de) * 1986-10-10 1986-11-20 Brugger, Stephan, Dipl.-Wirtsch.-Ing.(FH), 8137 Berg Membrankompressor

Also Published As

Publication number Publication date
EP0263199A1 (fr) 1988-04-13
DE3680339D1 (de) 1991-08-22
EP0263199B1 (fr) 1991-07-17
ATE65299T1 (de) 1991-08-15

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