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EP0055467B1 - Pompe à membrane ayant une membrane déchargé de pression - Google Patents

Pompe à membrane ayant une membrane déchargé de pression Download PDF

Info

Publication number
EP0055467B1
EP0055467B1 EP81110720A EP81110720A EP0055467B1 EP 0055467 B1 EP0055467 B1 EP 0055467B1 EP 81110720 A EP81110720 A EP 81110720A EP 81110720 A EP81110720 A EP 81110720A EP 0055467 B1 EP0055467 B1 EP 0055467B1
Authority
EP
European Patent Office
Prior art keywords
diaphram
chamber
pressure
housing body
diaphragm
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
Application number
EP81110720A
Other languages
German (de)
English (en)
Other versions
EP0055467A1 (fr
Inventor
Horst Dipl.-Ing. Fritsch
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.)
Lewa Herbert Ott GmbH and Co KG
Original Assignee
Lewa Herbert Ott GmbH 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.)
Filing date
Publication date
Application filed by Lewa Herbert Ott GmbH and Co KG filed Critical Lewa Herbert Ott GmbH and Co KG
Priority to AT81110720T priority Critical patent/ATE10670T1/de
Publication of EP0055467A1 publication Critical patent/EP0055467A1/fr
Application granted granted Critical
Publication of EP0055467B1 publication Critical patent/EP0055467B1/fr
Expired legal-status Critical Current

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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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009—Special features
    • F04B43/0054—Special features particularities of the flexible members
    • 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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/06—Pumps having fluid drive
    • F04B43/067—Pumps having fluid drive the fluid being actuated directly by a piston

Definitions

  • the invention relates to a diaphragm pump according to the preamble of claim 1.
  • the diaphragm clamping which is achieved by the peripheral edge of the diaphragm clamped between the housing body and the pump cover, acts at the same time in such a diaphragm pump as a seal of the pressure chamber from the atmosphere, so that such a construction can only achieve delivery pressures of up to 350 bar, since the The tightness of the diaphragm pump must also be ensured with critical fluids, such as toxic or abrasive dosing media.
  • diaphragm pump constructions of the above-mentioned other type namely those with metal diaphragms
  • metal membranes naturally only allow small deflections and therefore require a much larger membrane bending diameter than plastic membranes.
  • the highest demands are placed on the processing quality of the sealing surfaces, namely on the clamping surface of the metal membrane, and on the surface quality of the membrane material.
  • Diaphragm pumps with metal membranes are therefore much larger and more expensive than those with plastic membranes.
  • operational safety is lower because metal membranes are more sensitive to breakage, e.g. can easily be caused by suspension or dirt particles in the medium.
  • the invention is therefore based on the object of designing the diaphragm pump of the generic type in order to eliminate the disadvantages described in such a way that it is suitable for delivery pressures of well over 350 bar and at the same time permits the use of reliable, displacement-intensive plastic membranes.
  • the invention is based on the idea of relieving the clamping surface of the membrane of the sealing function, which it had previously had to perform simultaneously, i.e. H.
  • the diaphragm is relieved of pressure with a precisely defined deformation between the pump cover and the housing body in such a way that the same pressure, namely that of the pressure chamber, always prevails both radially inside and radially outside the diaphragm clamping surface.
  • the pressure chamber of the diaphragm pump is sealed off from the atmosphere in the usual way by a separate seal. Sealing of this type is problem-free because only hydraulic fluid, usually mineral oil, has to be sealed. Thus, the previously difficult task of securely sealing volatile, aggressive or toxic fluids at high pulsating pressures is reduced to a technically simple, proven solution, namely sealing oil at pulsating pressure.
  • sealing elements e.g. 0-rings can be used.
  • the circumferential pressure equalization space which is arranged radially outside the membrane clamping surface and has the shape of an annular groove, is provided in the end face of the housing body and is connected to the pressure space via at least one connecting channel.
  • This connecting channel can either be connected directly to the pressure chamber or can be guided to a blind bore in the housing body, which receives a snift valve arrangement connected to the hydraulic supply and is in turn connected to the pressure chamber via a further channel.
  • Reliable, displacement-intensive plastic membranes can therefore be used in the membrane pump designed according to the invention and, at the same time, delivery pressures of up to, for example, 1200 bar with a membrane service life of over 20,000 operating hours can be achieved.
  • the invention is based on the following
  • the diaphragm pump shown has a pump housing in the form of a housing body 2 which is closed at the end by a pump cover 1 and in which an oscillating displacement piston 3 works as a hydraulic diaphragm drive. This can be mechanically pushed back and forth in an axial bore 4 of the housing body 2 and is sealed off from a hydraulic supply 6 by a sealing packing 5.
  • the pump cover 1 is detachably fixed on the end face to the housing body 2 by screws 7, a delivery chamber 8 and a pressure chamber 9 filled with hydraulic fluid being formed in the mutually facing end faces of the pump cover 1 and the housing body 2 by correspondingly large, diameter-concave recesses.
  • the pressure chamber 9, which opens at the bottom in the middle into the bore 4 of the housing body 2, which displaceably guides the displacer 3, is separated from the delivery chamber 8 by a plastic membrane 10, which in the illustrated embodiment consists of a single membrane, but also of several, sandwiched one above the other Membranes can be formed and in any case is firmly clamped between the pump cover 1 and the housing body 2 in the manner described below.
  • the pump cover 1 has a spring-loaded inlet valve 11 and a spring-loaded outlet valve 12, these valves 11, 12 being connected to the delivery chamber 8 via an inlet channel 13 and an outlet channel 14 in such a way that the delivery medium flows to the right according to FIG. 1 Suction stroke of the diaphragm 10 in the direction of arrow A is sucked into the delivery chamber 8 via the inlet valve 11 and the inlet duct 13 and metered out in the direction of arrow B during the pressure stroke of the diaphragm 10 to the left according to FIG. 1 via the outlet duct 14 and the outlet valve 12 the delivery chamber 8 is pushed out.
  • an overflow valve 15 serving for overpressure protection is provided in the housing body 2, which has a valve ball arranged in the bottom side in a blind bore 16 of the housing body 2 and loaded in the manner shown by an adjustable spring 17 15 ', the blind bore 16 being connected to the hydraulic reservoir 6 by a duct 18 and to the pressure chamber 9 by a duct 19.
  • the pressure chamber 9 is then connected to the hydraulic reservoir 6 via the channels 19, 18 and is depressurized if an inadmissibly high pressure should be built up in the pressure chamber 9 during the pressure stroke of the membrane 10.
  • a sniffer valve 21 is received in a further blind bore 20 of the housing body 2, which releases the connection of the pressure chamber 9 to the hydraulic reservoir 6 for the purpose of vacuum protection when the membrane 10 is in contact with the pressure chamber during the membrane suction stroke.
  • the blind bore 20 is connected via a channel 22 to the pressure chamber 9 and via a channel 23 to the hydraulic reservoir 6, the snifting valve 21 in the manner shown having a spring-loaded valve ball 25 resting on the underside of the bottom of an insert body 24, which at Reaches a certain preset negative pressure and accordingly connects the pressure chamber 9 to the hydraulic reservoir 6 via the channels 22, 23.
  • this sniffer valve 21 also serves to vent the pressure chamber 9, i.e. the degassing of the hydraulic fluid in the pressure chamber 9.
  • the channel 22 in the housing body 2 is designed to rise, in such a way that its geodetically lower end (left channel end in FIG. 1) with the geodetically highest point of the pressure chamber 9 and its geodetically higher end (right channel end in 1) is connected to the blind bore 20, so that a functionally reliable degassing of the hydraulic fluid or venting of the pressure chamber 9 is always achieved automatically.
  • the membrane 10 with a clamping surface 26 formed by a peripheral edge is firmly clamped between those parts of the facing end faces of the housing body 2 and the pump cover 1, which are connected to the delivery chamber 8 and the pressure chamber 9 adjoin, this membrane clamping surface 26 being inserted into an annular recess 27 formed in the end face of the housing body 2.
  • a circumferential pressure compensation chamber 28 is provided in the end face of the housing body 2, which has the shape of an annular groove and, in the exemplary embodiment shown, via a single connecting channel 29 formed in the housing body 2 with the blind bore 20 receiving the snifting valve 21 - and thus via the channel 22 with the pressure chamber 9 - is connected. This ensures that both radially outside and radially inside the membrane clamping surface 26, i.e. So both in the pressure chamber 9 and in the pressure compensation chamber 28, the pressure is always the same and the membrane clamping surface 26 is thus relieved of pressure.
  • the connecting channel 29 - like the channel 22 - is also designed to rise in the housing body 2 and is designed such that it extends from the geodetically highest point of the pressure compensation chamber 28 to the geodetically highest point of the pressure chamber 9 - namely via the blind bore 20 and the channel 22 - leads, so that a safe degassing of the pressure compensation chamber 28 is also ensured.
  • the membrane 10 additionally has an outer edge 26 'on its clamping surface 26, which has a considerably smaller thickness than the membrane main body, the thickness of this outer clamping edge 26' preferably being about 5-20% of the thickness of the membrane main body.
  • the width of the outer clamping edge 26 ' should be at least 10 times its thickness.
  • the advantage of an even greater sealing and clamping security is achieved.
  • the malfunction may occur that the pressure in the delivery chamber 8 becomes greater than in the pressure chamber 9, for example when the outlet valve 12 is stuck or when its spring breaks, etc.
  • the diaphragm 10 Similar to their movement during the suction stroke - deflected and pressed against the concave support surface of the pressure chamber 9, the clamping edge of the membrane 10 formed by the usual clamping surface 26 being excessively stressed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Claims (6)

1. Pompe à membrane, comportant au moins une membrane (10) qui sépare une chambre de refoulement (8) d'une chambre de compression (9) remplie d'un fluide hydraulique et dont la fixation entre un corps (2) et un couvercle de pompe (1) est assurée sur une face (26) formée par son rebord périphérique, un système d'actionnement hydraulique de la membrane représenté par un piston de déplacement oscillant (3), dont le mouvement s'effectue dans le corps (2) entre la chambre (9) et un réservoir d'hydraulique (6), ainsi qu'un joint torique (30), prévu entre le couvercle (1) et le corps (2) et assurant l'étanchéité de la chambre de compression (9) par rapport à l'atmosphère, caractérisée en ce que la partie radiale externe à la face de fixation (26, 26') de la membrane comporte une chambre de compensation de pression (28) périphérique, représentée par une rainure annulaire et reliée par un conduit de raccordement au moins (29) à la chambre de compression (9), et en ce que le joint torique (30), prévu entre le corps (2) et le couvercle de pompe (1), se situe dans la partie radiale externe à la chambre de compensation (28).
2. Pompe à membrane suivant la revendication 1, caractérisée en ce que la rainure annulaire servant de chambre de compensation de pression (28) se situe dans la face frontale du corps (2) et présente un point de raccordement au moins à la chambre de compression (9), par l'intermédiaire du conduit (29) également prévu dans le corps (2).
3. Pompe à membrane selon une des revendication 1 et 2, caractérisée en ce que le conduit de raccordement (29) relie les points géodésique- ment supérieurs de la chambre de compensation de pression (28) et de la chambre de compression (9, 22, 20).
4. Pompe à membrane selon une quelconque des revendications 1 à 3, caractérisée en ce que la membrane (10) présente, sur le rebord externe (26') de sa face de fixation (26), une épaisseur beaucoup plus faible que celle de son corps.
5. Pompe à membrane suivant la revendication 4, caractérisée en ce que l'épaisseur du rebord aminci (26') représente environ 5 à 20% de celle du corps de la membrane (10).
6. Pompe à membrane selon une des revendications 4 et 5, caractérisée en ce que la largeur du rebord externe (26') de la membrane (10) est au moins égale au décuple de son épaisseur.
EP81110720A 1980-12-29 1981-12-23 Pompe à membrane ayant une membrane déchargé de pression Expired EP0055467B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81110720T ATE10670T1 (de) 1980-12-29 1981-12-23 Membranpumpe mit druckentlastet eingespannter membran.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3049341 1980-12-29
DE3049341 1980-12-29

Publications (2)

Publication Number Publication Date
EP0055467A1 EP0055467A1 (fr) 1982-07-07
EP0055467B1 true EP0055467B1 (fr) 1984-12-05

Family

ID=6120468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81110720A Expired EP0055467B1 (fr) 1980-12-29 1981-12-23 Pompe à membrane ayant une membrane déchargé de pression

Country Status (4)

Country Link
US (1) US4430048A (fr)
EP (1) EP0055467B1 (fr)
JP (1) JPS57146078A (fr)
AT (1) ATE10670T1 (fr)

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* Cited by examiner, † Cited by third party
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WO2023001840A1 (fr) * 2021-07-23 2023-01-26 ventUP GmbH Doseur comprenant des éléments fonctionnels encapsulés

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023001840A1 (fr) * 2021-07-23 2023-01-26 ventUP GmbH Doseur comprenant des éléments fonctionnels encapsulés

Also Published As

Publication number Publication date
JPS6331673B2 (fr) 1988-06-24
US4430048A (en) 1984-02-07
EP0055467A1 (fr) 1982-07-07
ATE10670T1 (de) 1984-12-15
JPS57146078A (en) 1982-09-09

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