EP0214394B2 - Membranpumpe - Google Patents

Membranpumpe Download PDF

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Publication number
EP0214394B2
EP0214394B2 EP86109172A EP86109172A EP0214394B2 EP 0214394 B2 EP0214394 B2 EP 0214394B2 EP 86109172 A EP86109172 A EP 86109172A EP 86109172 A EP86109172 A EP 86109172A EP 0214394 B2 EP0214394 B2 EP 0214394B2
Authority
EP
European Patent Office
Prior art keywords
valve
pump
diaphragm pump
diaphragm
valve body
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
EP86109172A
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German (de)
English (en)
French (fr)
Other versions
EP0214394A3 (en
EP0214394A2 (de
EP0214394B1 (de
Inventor
Erich Becker
Erwin Hauser
Richard Von Der Heyde
Heinz Riedlinger
Klaus Velten
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
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Application filed by Individual filed Critical Individual
Publication of EP0214394A2 publication Critical patent/EP0214394A2/de
Publication of EP0214394A3 publication Critical patent/EP0214394A3/de
Publication of EP0214394B1 publication Critical patent/EP0214394B1/de
Application granted granted Critical
Publication of EP0214394B2 publication Critical patent/EP0214394B2/de
Anticipated expiration legal-status Critical
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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
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • 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
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/04—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being hot or corrosive

Definitions

  • the invention relates to a diaphragm pump according to the preamble of the first claim.
  • Diaphragm pumps are already known, e.g. for vacuum generation, in which the inlet and outlet valves are controlled by the pressure differences of the pumped medium (DE-A 1 428 007).
  • the upper part of the pump has the diaphragm connected to a connecting rod, an intermediate plate with a compression space incorporated therein, a valve plate above and an end cover.
  • the membrane is clamped sealingly at its edge between the metal housing and the intermediate plate, while the valve plate, particularly in the edge area, is clamped sealingly between the intermediate plate on the one hand and the end cover.
  • intermediate plate and the end cover are made of metal, these parts are correspondingly rigid and the necessary tightness is achieved at the transition surfaces, in particular the valve plate.
  • the formation of the end cover and intermediate plate made of metal has the disadvantage that these parts are then not sufficiently resistant to a wide variety of aggressive media; in any case, this cannot be achieved with the usual, inexpensive materials.
  • metallic intermediate plates and end covers have been provided with a PTFE coating at least on the surfaces which come into contact with the conveying medium.
  • a diaphragm metering pump which has two ball check valves in both its suction and delivery lines, the balls of which interact with frustoconical sealing seats and the seats are made of corrosion-resistant material (cf. DE-A 3 311 413).
  • the valves of this known diaphragm metering pump are arranged in a pump head which is essentially made in one piece.
  • this pump is designed more as a slow-running metering pump and is hardly suitable for high-speed pump drives.
  • the dead space formed, inter alia, by the connecting channels of the valves of this known pump connected in series is comparatively large, which can be particularly disadvantageous, for example, in the case of vacuum generation.
  • a diaphragm pump is also already known, which has two valves in its pump head which are controlled by the pumped medium and serve as inlet or outlet valves and which essentially consist of a valve disk and cooperating passages and passage openings provided in the pump head (cf. DE-A-OS 2 713 599, which is now to be regarded as the closest prior art).
  • these valve disks which consist of permanently corrosion-resistant plastic, are arranged in the central section of a valve receiving opening having three sections of different diameters. The section with the smallest diameter is arranged first in the flow direction of the valve and can vary depending on the stroke Movement of this known pump can be closed by the valve disc.
  • the passage openings of these holding elements are arranged in such a way that it is impossible for the valve disks to close the passage openings even when they rest or rest on the respective holding element.
  • the lifting movement of this diaphragm pump controls the disks of their valves in such a way that they can interrupt a flow of conveying medium by completely closing the section of its receiving opening which has the smallest diameter or can open it by releasing these diameters.
  • valve disk which is made of plastic and serves as a valve element
  • the valve disk made of polytetrafluoroethylene and the pump head are already in this pump made of polyphenylene oxide, i.e. made of plastics with self-lubricating and non-stick properties.
  • valve receiving cavities each have a valve space facing the displacement space of the pump and connected to it by a channel section and then, to the outside, a threaded bore or the like connecting part for one have a through-hole connecting plug, and that the connecting plug each have a stop surface which limits the lifting height of the associated valve.
  • the pump head of the diaphragm pump according to the invention is made of a chemically inert material such as PTFE and therefore has complete resistance to the pumped medium.
  • the valves of the diaphragm pump according to the invention are easily adjustable by the stop faces of the connecting plugs which limit their stroke height.
  • valve receptacle cavities after testing the frequency range of the valve body or valve plate, their freedom of movement and lifting height can be adjusted in a simple manner so that these valve bodies or valve plates work approximately in their own resonance range. As a result, rapid valve movements are possible without greater opening forces and at the same time low energy consumption, which in particular favors the volumetric efficiency of the pump according to the invention.
  • valve parts of the inlet and outlet valves of the diaphragm pump according to the invention can be produced practically the same and with the same dimensions and are comparatively easily and conveniently accessible by loosening the connecting plug from the pump head, which facilitates the manufacture, but also the repair and maintenance of the diaphragm pump according to the invention.
  • the pump head which is expediently formed in one piece, is made of reinforced, chemically inert plastic, preferably of glass fiber reinforced polytetrafluoroethylene.
  • a pump head also has the required dimensional stability, to ensure a secure seal, especially at the clamping edge of the working membrane.
  • valves of the diaphragm pump according to the invention or their plate-shaped valve body are preferably axially displaceably mounted in the pump head or in the valve guide sleeves provided there without spring loading. This not only eliminates additional sealing points, such as those that occur with valve plates, but also spring forces that strain the plate valves can be avoided.
  • Plate valves are already known from DE-C 826 244; However, these have to be centered and closed by coil springs, which leads to larger dead spaces and, due to the spring forces, to larger opening forces. Since the opening forces are applied by the pumped medium, they reduce the volumetric efficiency of the pump.
  • valves or their plate-like valve bodies have crenellated projections on their passage side, which are preferably distributed uniformly around the circumference of these valve bodies in the edge region. This not only creates the conveying medium passage area in the open position of the valve body, but also results in greater flexural rigidity of the plate valves, at least in some sectors, in particular in the area of their sealing surface. This avoids undesirable deformations that could either impair the mobility of the plate valves and / or their tightness.
  • both the plate valve for the outlet and that for the inlet are the same, i.e. trained with the same outline shape. This leads to a simplification in the manufacture as well as in the repair and maintenance of the pump and in the storage of the corresponding spare parts. In particular, there can be no confusion when the plate valves are replaced; you only have to pay attention to the correct position of the plate valve, depending on whether it is installed on the inlet or outlet side.
  • An essential development of the invention consists in that a guide sleeve for essentially axially guiding an associated valve body is preferably provided in each, but at least in one valve chamber of the pump head, the axial length of the guide sleeve preferably being used as a limitation for the use of the associated connecting plug and thus as a limitation the lifting height of the valve body is provided.
  • the clear cross section of this guide sleeve is somewhat coarser than the outside diameter of the valve body.
  • This guide sleeve also preferably consists of fiberglass-free, chemically inert material, in particular of polytetrafluoroethylene.
  • Such a guide sleeve primarily prevents the valve body from rubbing against the circumference of a corresponding pump head, in particular reinforced with glass fibers. Such abrasion would enlarge the cross sections provided for the passage of the medium and could impair the operation of the diaphragm pump according to the invention.
  • the guide sleeves thus ensure, among other things, that one is free with regard to the valve body in the choice of the material of the pump head and can in particular be made of glass fiber reinforced PTFE.
  • the connection plugs can also consist of glass-fiber-free, chemically inert plastic, in particular of PTFE, since there is no frictional up and down movement of the valve body.
  • the pump head is expediently braced against the pump housing by means of a head cover plate located above it.
  • a head cover plate located above it.
  • the cap screws do not have a localized effect on the pump head made of plastic. Rather, it is clamped continuously on both sides between the pump housing on the one hand and the head cover plate on the other on its flat sides, in particular in the edge region, which contributes to its shape stabilization.
  • recesses are provided in the head cover plate for the connection plugs.
  • a pump is particularly advantageous in which the pump head consists essentially of one piece from chemically inert, by appropriate deposits such.
  • B. consists of glass fiber reinforced plastic and the guide sleeves of the valve body and preferably these themselves are made of glass fiber-free, chemically inert plastic.
  • the diaphragm of the diaphragm pump according to the invention is designed as a shaped diaphragm which is matched to the spatial shape of the displacement space incorporated in the pump head.
  • the design of the working diaphragm as a shaped diaphragm with appropriate adjustment to the displacement space favors that the pump can work with very little dead space and is also particularly suitable for vacuum generation.
  • the edges of the molded diaphragm can be tightly clamped by the pump head in relation to the metal and accordingly rigid pump housing.
  • the pump according to the invention is suitable for conveying both liquid and gaseous media; in particular, due to its small dead space, it can also be used as a vacuum pump.
  • a diaphragm pump 1 (FIG. 1) has a crank mechanism 3 which is located in a pump housing 2 and which is in drive connection via a connecting rod 4 with a shaped diaphragm 5. Above the membrane 5 there is a displacement space 6 which is delimited on the one hand by the membrane 5 and on the other hand by a pump head 7 or a spherical bulge 33 therein. The membrane 5 is clamped between the lower pump housing 2 and the pump head 7. Head screws 8, which act on the pump head 7 with the interposition of a head cover plate 9, serve as the connection between the pump housing 2 and the pump head 7.
  • the pump parts that come into contact with the media are made of chemically inert plastic, with polytetrafluoroethylene (PTFE) being particularly suitable.
  • the pump head 7 is essentially formed in one piece from such a material and has receiving openings or receiving cavities 10 for valves 11, 12 which also consist of chemically inert material.
  • the outlet valve is designated 11 and the inlet valve 12, which is further illustrated by the arrows Pf 1 and Pf 2.
  • Each receiving cavity 10 has a valve chamber 13 which faces the displacement chamber 6 and in which valve body 14 are mounted.
  • the valve spaces 13 are connected to the displacement space 6 via short channel sections 15 or connection openings.
  • the channel sections 15 are as short as possible in order to keep the dead space as small as possible.
  • the clear cross section of the channel sections 15 is substantially smaller than the cross section of the valve chamber 13.
  • the inner opening surface in the valve chamber 13 forms a stop surface 34 for the respective valve body 14 on the displacement chamber side.
  • the valve chamber 13 is delimited by a plug 16 located in the receiving cavity 10.
  • the inner end faces 17 of the connecting plugs 16 form the corresponding stop faces for the valve body 14 (cf. FIGS. 1 and 5).
  • the connection plugs 16 have a central through-bore 18 as the fluid inlet or fluid outlet.
  • the connection plugs 16 are designed as screw plugs with an external thread, which engages in a threaded bore of the valve receiving cavity 10 which adjoins the valve chamber 13 to the outside. Due to the variable insertion depth of the connecting plug 16, the lifting height of the valves or valve body 14 can also be adjusted. This makes it possible to be able to set a lifting height at which the valve body 14 operates approximately in the natural resonance range. This allows very fast valve movements with a low energy requirement, which also improves the efficiency of the pump 1.
  • the valves 11 and 12 are designed as plate valves and also consist of chemically inert material.
  • the spacers 20 are arranged in a crenellated manner in the edge region and evenly distributed on the circumference. They are flush with the outer end face 22 of the valve body 14.
  • the crenellated spacers 20 are dimensioned in their height h and in their spacing from one another such that when these spacers 20 abut against a boundary side of the valve chamber 13 forming a stop, there is still a sufficiently large passage cross section for the conveying medium.
  • the outer diameter of the valve body 14 is dimensioned in comparison to the clear cross section of the valve chamber 13 so that in the open position of the valves 11 or 12 there is also sufficient open cross section on the side.
  • the valve body 14 On the sealing side 19, the valve body 14 has an annular sealing edge 23 and a recess 24 adjoining the inside.
  • the outer sealing edge 23 promotes a particularly good seal and the mass 24 of the valve body 14 is reduced by the recess 24 without influencing its stability.
  • the spacers 20 located on the other side are arranged approximately in the area of this sealing edge 23 and support or stabilize this area, so that undesired deformations are largely avoided here.
  • the spacer 20, which is flush with the outer end face 22 of the valve body 14, also makes the guide length of the valve body 14 in the valve space 13 or a guide located there ring 25 extended. This also counteracts tilting of the practically overhung valve body 14.
  • the pump head 7 is preferably made of glass fiber reinforced PTFE in order to obtain the necessary stability.
  • a guide sleeve 25 in each valve chamber 13 for guiding or limiting the side of the valve body 14.
  • This sleeve does not consist of -glass fiber reinforced plastic, preferably made of PTFE, as well as the valve body 14 itself.
  • the side surfaces of the valve body 14 or the sleeve which rub against each other during the valve movement therefore do not have any reinforcing additives which increase the abrasion, so that there is only a slight abrasion in this range of motion .
  • valve body 14 is the same for the exhaust valve 11 as for the intake valve, i.e. is designed with the same outline shape, there can be no confusion when replacing the valve body. Overall, this results in a simplification both in the manufacture and also in the repair and maintenance of the pump and in the storage of the corresponding spare parts.
  • valve body 14 is provided for the inlet valve and the outlet valve 12, which, however, as can be seen clearly in FIG. 1, are inserted vice versa into the two valve chambers 13.
  • both valve bodies 14 rest on the lower stop surface 34, which is formed by the delimitation side of the valve chamber 13 facing the displacement chamber 6.
  • This valve body position is set in particular in the suction position, in which case the pumped medium enters via the inlet valve 12, flows around the valve body 14 laterally and on the passage side 21 and enters the displacement chamber 6.
  • the channel section 15 of the outlet valve 12 is closed by the sealing side of the valve body 14 used there.
  • connection plugs 16 have a head 26 for engaging a twisting tool and then have an insertion section provided with an external thread. This is followed by a thread-free section 28, the outer diameter of which corresponds approximately to the diameter of the valve chamber 13.
  • extension 29 which forms the end face 17 which delimits the valve chamber 13 at its front end. This approach engages somewhat in the guide sleeve 25, as can be clearly seen in FIG. 1.
  • the guide sleeves 25 also serve as an insertion or screw-in limitation for the connecting plug 16.
  • the connecting plug 16 there is a stepped bore 31, the outer area of which is somewhat larger in cross-section and has an internal thread for screwing in a connecting line.
  • the lower section of the stepped bore opens into the valve chamber 13.
  • the chamfer 32 provided in the guide sleeve 25 serves on the one hand as an insertion aid when inserting or screwing in the connecting plug 16, but on the other hand also as a tolerance deformation zone.
  • the working membrane is designed as a molded membrane 5, the profiling facing the displacement space 6 of which is adapted to the latter, so that the molded membrane 5 completely fills the displacement space 6 in a known manner in the upper dead position, as a result of which the dead space is kept small.
  • the recess corresponding to the displacement space 6 is accommodated in the pump head 7.
  • FIGS. 6 to 8 also show an anti-rotation device 35 by means of which the two connection plugs 16 can be held in a position that has been set once. In particular, this is intended to prevent the connecting plugs 16 from twisting during the assembly or disassembly of screw-in screw connections. As already described above, the screw-in depth of the connecting plugs 16 allows the volume flow to be adjusted to a certain extent after the pump has been installed. If the correct value is set, the anti-rotation device 35 can be used to fix it so that the user of the pump can then no longer make any unintentional adjustments.
  • the anti-rotation device includes an O-ring 37, which is mounted on the one hand in an outer receiving groove 38 and on the other hand in an annular groove 42 located in the head 36 of the connection plug 16.
  • the outer receiving groove 38 is formed between the head cover plate 9 on the one hand and a pressure ring 39 on the other hand, wherein the mutually facing inner edges of these two parts 38 have bevels 40 and 41 to form this receiving groove.
  • the two pressure rings 39 are by screws 43 which in the Head cover plate 9 can be screwed in.
  • the two chamfers 40, 41 and also the annular groove 42 in the connecting plug 16 are now dimensioned such that when the pressure rings 39 are screwed tight, the respective O-ring is radially displaced into the annular groove 42 or the outer wall of the connecting plug 16.
  • the connecting plugs 16 are held in a force-fitting manner, so that twisting of the valve body or connecting plug 16 is no longer possible.
  • valve body 14 can also consist of PVDF (polyvinylidene fluoride) instead of PTFE.
  • PVDF polyvinylidene fluoride
  • the valve body 14 can then advantageously be easily manufactured by an injection molding process. If the pumped medium does not allow the use of PVDF valve bodies, they are made of PTFE.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP86109172A 1985-09-10 1986-07-04 Membranpumpe Expired - Lifetime EP0214394B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8525733U 1985-09-10
DE8525733U DE8525733U1 (de) 1985-09-10 1985-09-10 Membranpumpe

Publications (4)

Publication Number Publication Date
EP0214394A2 EP0214394A2 (de) 1987-03-18
EP0214394A3 EP0214394A3 (en) 1987-10-28
EP0214394B1 EP0214394B1 (de) 1989-12-20
EP0214394B2 true EP0214394B2 (de) 1993-06-23

Family

ID=6785056

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86109172A Expired - Lifetime EP0214394B2 (de) 1985-09-10 1986-07-04 Membranpumpe

Country Status (3)

Country Link
EP (1) EP0214394B2 (enrdf_load_stackoverflow)
JP (1) JPH0543274Y2 (enrdf_load_stackoverflow)
DE (2) DE8525733U1 (enrdf_load_stackoverflow)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4836756A (en) * 1986-08-28 1989-06-06 Nippon Pillar Packing Co., Ltd. Pneumatic pumping device
DE4136805A1 (de) * 1991-11-08 1993-05-13 Almatec Tech Innovationen Gmbh Doppelmembranpumpe
US5547351A (en) * 1994-03-01 1996-08-20 The United States Of America As Represented By The Secretary Of The Department Of Health And Human Services Low pressure low volume liquid pump
US5542921A (en) * 1994-11-04 1996-08-06 Gerber Products Company Electric breast pump
USD372975S (en) 1994-11-04 1996-08-20 Gerber Products Company Electric breast pump
US7975717B2 (en) * 2003-01-09 2011-07-12 Thomas Industries, Inc. Pin insert
FR2913732B1 (fr) 2007-03-13 2012-08-17 Milton Roy Europe Pompe de dosage a membrane isolante d'une de ses parois ou flasque d'extremite de la chambre de dosage
CN104343655B (zh) * 2013-07-30 2016-11-16 上海纤检仪器有限公司 一种用于纤维检测的抽滤泵
JP6349134B2 (ja) * 2014-04-11 2018-06-27 東京理化器械株式会社 ダイヤフラム真空ポンプ
US11698064B2 (en) * 2017-12-29 2023-07-11 Koninklijke Philips N.V. System and method for operating a pump in a humidifier

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2711137A (en) * 1951-02-20 1955-06-21 Clifford B Moller Chemical feed pump
DE1428007A1 (de) * 1963-07-06 1968-12-05 Erich Becker Membran-Pumpe
US4086036A (en) * 1976-05-17 1978-04-25 Cole-Parmer Instrument Company Diaphragm pump
JPS5919831Y2 (ja) * 1980-06-05 1984-06-08 義夫 木下 耐薬液用プランジヤ−ポンプ
IT8221999U1 (it) * 1982-05-26 1983-11-26 Kamyr Srl Pompa dosatrice a membrana, provvista di doppie valvole di ritegno.

Also Published As

Publication number Publication date
EP0214394A3 (en) 1987-10-28
DE8525733U1 (de) 1987-01-15
EP0214394A2 (de) 1987-03-18
EP0214394B1 (de) 1989-12-20
JPS62176492U (enrdf_load_stackoverflow) 1987-11-09
DE3667707D1 (de) 1990-01-25
JPH0543274Y2 (enrdf_load_stackoverflow) 1993-10-29

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