US3635598A - Diaphragm pump - Google Patents

Diaphragm pump Download PDF

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Publication number
US3635598A
US3635598A US853666A US3635598DA US3635598A US 3635598 A US3635598 A US 3635598A US 853666 A US853666 A US 853666A US 3635598D A US3635598D A US 3635598DA US 3635598 A US3635598 A US 3635598A
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US
United States
Prior art keywords
diaphragm
outer housing
separating wall
chamber
suction
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
US853666A
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English (en)
Inventor
Horst Sieper
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.)
A Pierburg Auto und Luftfahrt Geraetebau KG
A Pierburg KG
Original Assignee
A Pierburg 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 A Pierburg KG filed Critical A Pierburg KG
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Publication of US3635598A publication Critical patent/US3635598A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/43—Arrangements for supplying air, fuel or auxiliary fluids to a combustion space of mixture compressing engines working with liquid fuel
    • F02M2700/4302—Arrangements for supplying air, fuel or auxiliary fluids to a combustion space of mixture compressing engines working with liquid fuel whereby air and fuel are sucked into the mixture conduit
    • F02M2700/438—Supply of liquid to a carburettor reservoir with limitation of the liquid level; Aerating devices; Mounting of fuel filters
    • F02M2700/4388—Supply of liquid to a carburettor reservoir with limitation of the liquid level; Aerating devices; Mounting of fuel filters with fuel displacement by a pump
    • F02M2700/439—Supply of liquid to a carburettor reservoir with limitation of the liquid level; Aerating devices; Mounting of fuel filters with fuel displacement by a pump the pump being a membrane pump

Definitions

  • the space contained [21 PP N04 353,666 between the diaphragm and the outer housing forms the working space of the pump through which the fluid is sucked in and discharged.
  • This space is divided by a single unitary separating [30] Foreign Application Priority Dam wall into three separate chambers. This is effected by clamp- Sept. 5, 1968 Germany ..P 17 28 171.9 ing the edge of the separating wall between the diaphragm and the rim of the outer housing and forming the separating wall so [52] U.S. Cl ..417/571, 417/471 that it also forms a second seal against the outer housing.
  • This Illl- Cl -F04b F0413 7/ second seal extends round a closed path and the space [58] Field of Search ..4l7/542, 571, 471 between the outer housing and the separating wall within this sea] forms a suction chamber and the space outside this seal is [56] References Cited divided by a further part of the separating wall into a working chamber partly defined by the diaphragm and a pressure UNITED STATES PATENTS chamber.
  • the separating wall is provided with a suction non- 3 200 75s 8/1965 Grabiel ..417 471 mum valve between the Suction chamber and the working 3 304 880 2/1967 001d et al. ..417 471 x chamber and an outlet 110mm" valve between the Pressure chamber and the working chamber.
  • diaphragm pumps such as fuel pumps for internal combustion engines of the kind comprising inner and outer housings separated by the diaphragm, the outer housing being situated on the working side of the diaphragm and containing a suction chamber, a pressure chamber and a working chamber.
  • Diaphragm fuel pumps are known in which the outer housing consists of two superposed housing parts.
  • the lower housing part In the lower housing part there is a supporting wall whose outer edges are closely bonded to the diaphragm and to the housing part.
  • the supporting wall contains one way inlet and outlet valves.
  • the supporting wall separates the working chamber which is situ ated above the diaphragm, from the suction chamber which is situated above the inlet valve, and also from the pressure chamber which is situated above the outlet valve.
  • the bush is situated between the supporting wall and a shoulder on the lower part of the outer housing.
  • This pump is expensive to construct, due to the necessary seals between the suction chamber and the pressure chamber, and between the pressure chamber and the working chambenThe pump is therefore not economic to manufacture. Furthermore the pump occupies a great deal of space, due to the positioning of the valves next to each other, and is therefor comparatively large.
  • the object of the present invention is to provide a diaphragm pump of the kind described, which is suitable for use as a fuel pump and which is free from the disadvantages mentioned above.
  • the outer housing contains a separating wall which is in one piece and which divides the volume enclosed by the outer housing into three separate chambers, a suction chamber, a pressure chamber, and a working chamber, this being arranged by having the separating wall sealed at its rim between the diaphragm and the rim of the outer housing, and again sealed at a different position to the inside surface of the outer housing along a closed line.
  • the separating wall is all of one piece it is easy to provide a suction valve and a delivery valve in the separating wall, one of these two valves being situated within the closed contact line, and the other between the closed contact line and the outer rim of the separating wall.
  • the separating wall is constructed so that it effectively separates the three chambers of the pump from each other, that is to say the suction chamber, the working chamber and the pressure chamber, forming good seals between them.
  • the present invention allows a fuel pump to be manufactured economically in series production at a high rate of output, while still maintaining a high degree of efficiency in the working pump.
  • a diaphragm pump which is particularly simple to manufacture is obtained by having the outer housing consisting of a cylindrical part whose diameter is substantially equal to the diameter of the diaphragm, and on top of this a cover part in the form of a dome.
  • the separating wall is sealed to the outer housing at the transition position where the lower cylindrical part merges into the dome.
  • This seal, between the separating wall and the outer housing may be formed directly where the two parts rest in contact with each other, or by means of an interposed annular seal.
  • the arrangement consisting of a dome mounted on a cylindrical part allows the outer housing to be manufactured very easily, for example by a drawing operation, the cylindrical part and the dome being drawn in one piece.
  • the separating wall, which is sealed to the outer housing at the transition point between the dome and the cylindrical part can also be made in the same way. These parts can be drawn either in sheet metal or in a synthetic plastics.
  • the dome is preferably eccentric with respect to the cylindrical part, leaving a somewhat crescent shaped, inclined surface to take one of the valves. What is obtained in this way is that the two valves need not be positioned next to each other in the same plane, or in parallel planes, as has hitherto been necessary. One of the two valves can be arranged at an angle to the other, without this in any way impairing the action of the pump. This gives a compact construction, in that the external diameter of the pump can be less.
  • Constructing the outer housing in one piece is particularly advantageous when the pumps are manufactured in series production in large numbers.
  • the contact edges between the two parts of the outer housing should be below a fuel inlet connection into the dome, and centered on the middle axis of the dome. This allows the angular position of the fuel inlet connection to be chosen as desired.
  • FIG. 1 is a longitudinal section through a diaphragm fuel pump for use in an internal combustion engine
  • FIG. 2 is a plan view ofthe pump shown in FIG. ll;
  • FIG. 3 is a plan view of the separating wall of the pump shown in FIG. I, the outer housing having been removed;
  • FIG. 4 is a longitudinal section through part of a modified form of the pump shown in FIG. I.
  • the pump shown in FIG. I comprises an inner or spring housing in which an actuating rod is guided to slide up and down. This reciprocation is caused by a cam, not shown in the drawing, which acts on the lower end of the rod 11 and which is driven by the internal combustion engine to which the pump supplies the fuel.
  • the rod 11 is under the influence of a spring 12 which urges the rod downwards to keep it in contact with the cam.
  • a spring-loaded collar I3 containing a compression spring 14.
  • the function of the spring I4 is twofold.
  • the diaphragm 15 is attached at its outer rim to the inner or spring housing 10.
  • the outer rim of the diaphragm is squeezed and secured between the rim of the inner housing 10 and the outwardly and downwardly turned rim 16 of an outer housing 17.
  • the outer housing ll7 forms a continuation of the inner housing 110, the space bounded by these housings being separated by the diaphragm 15.
  • the outer housing consists of a lower part 18. nearest to the diaphragm l5, and mounted on top of this a dome or upper part 19.
  • the rim to of the outer housing 17 also secures and seals in place the outer rim 21 of a separating wall 22 which is in one piece and which is arranged within the outer housing 17 so that it divides the housing I?
  • the wall 22 also contacts and seals, directly or indirectly, with the inner surface of the outer housing 17 along a closed contact line 23.
  • the contact is indirect through an annular seal 24.
  • the seal is formed by direct contact between the wall 22 and the housing 17 along the line 23.
  • the seal 24 has an opening 26, forming a passage for the fuel, whose diameter is about the same as the internal diameter of the dome 19. However, this diameter may be less than that of the dome 19, in which case the position of the passage 26 is chosen so as to ensure that the passage is always below the surface of the fuel in the suction chamber 32 of the pump, taking into consideration the position in which the pump is installed.
  • the dome 19 is eccentrically mounted on the cylindrical part 18 of the housing 17.
  • the seperating wall 22 has an annular surface 27 which is positioned approximately coaxially with the dome 19, the annular surface 27 being within the boundary of the closed contact line 23.
  • the separating wall 22 has an inclined surface 28, which is somewhat sickle shaped, located between the contact line 23 and the outer edge 21 of the separating wall.
  • the annular surface 27 contains an inlet valve 29.
  • the sickle-shaped surface 28 contains an outlet valve 31.
  • the separating wall 22 thus separates three individual chambers from each other, that is to say the suction chamber 32, which extends from the separating wall up into the dome 19, a working chamber 33 which is above the diaphragm l and below the separating wall 22, and a pressure chamber 34 which is above the sickleshaped surface 28 and within the housing 17 radially outside the seal 24.
  • the pressure chamber 34 has an outlet connection 35.
  • the suction chamber 32 has an inlet connection 37, to which is attached a fuel filter 36.
  • the inlet connection 37 can be unscrewed for cleaning the fuel filter 36. From the inlet connection 37 a pipe, not shown in the drawing, leads to a fuel tank.
  • the modification shown in FIG. 4 differs from the example shown in FIG. 1 essentially in that the separating wall 22 rests in direct contact with the transition surface of the outer housing 17 as described earlier. This gives a tight seal without the use of any separate sealing part.
  • the modified version shown in FlG. 4 also differs from the version of FIG. 1, in that the outer housing 17 is made in two parts, particular care being taken to ensure that the jointed surfaces 38 between the upper and lower parts 19 and 18 are under the level of the fuel inlet connection 37, and are central with respect to the middle axis 39 of the dome 19. What is obtained is that during manufacture of the pump the angular position of the inlet connection 37 can be adjusted as required, relative to the cylindrical lower part 18 of the housing, merely by rotating the dome 19.
  • This type of construction in two parts, also greatly facilitates manufacture of the outer housing 17.
  • the two parts 18 and 19 can for example be made of sheet material or plastics using quite simple tools, for example they can be drawn.
  • the inlet connection 37 is made to screw into the dome 19 so that when it becomes necessary to clean the fuel filter 36, it can be removed easily.
  • the fuel after passing through the filter 36 into the suction chamber 32 flows through the inlet valve 29 during the suction stroke of the pump and so reaches the working chamber 33 above the diaphragm 15.
  • the diaphragm l5 deflects upwards, closing the inlet valve 29 and opening the outlet valve 31. This drives the fuel from the working chamber 33 into the pressure chamber 34, and so out through the outlet connection 35.
  • outlet connection 35 is connected by a pipe to the carburetor or injection pump of the internal combustion engine.
  • a diaphragm pump including an inner housing, an outer housing, means attaching said housings to each other, a diaphragm, means fixing said diaphragm between said inner and outer housings, an integral unitary separating wall, including a rim, means sealing said rim between said diaphragm and said outer housing, and means forming a continuous closed path seal between said separating wall and said outer housing, whereby said separating wall divides said outer housing into three separate chambers consisting of a suction chamber, a pressure chamber and a working chamber, said working chamber being bounded in part by said diaphragm, said diaphragm being circular and said outer housing including a cylindrical part adjacent said diaphragm having a diameter substantially equal to that of said diaphragm and a dome part which is mounted on said cylindrical part, said closed path seal extending around the junction of said dome part and said cylindrical part.
  • a diaphragm pump including an inner housing, an outer housing, means attaching said housings to each other in operative relationship, said outer housing consisting of a first portion and a second, dome-shaped portion which can be angularly positioned as required with respect to said first portion, a diaphragm, means fixing said diaphragm between said inner and outer housings, an integral unitary separating wall, including a rim, means sealing said rim between said diaphragm and said outer housing, and means forming a continuous closed path seal between said separating wall and said outer housing, whereby said separating wall divides said outer housing into three generally axially aligned separate chambers consisting of a suction chamber, a pressure chamber and a working chamber, said working chamber being bounded in part by said diaphragm, at least one suction valve, means mounting said suction valve on one side of said closed path seal, at least one delivery valve, and means mounting said delivery valve on the other side of said closed path seal, said suction valve allowing fluid to flow

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
US853666A 1968-09-05 1969-08-28 Diaphragm pump Expired - Lifetime US3635598A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681728171 DE1728171A1 (de) 1968-09-05 1968-09-05 Membranpumpe,insbesondere als Kraftstoffpumpe fuer Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
US3635598A true US3635598A (en) 1972-01-18

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ID=5690313

Family Applications (1)

Application Number Title Priority Date Filing Date
US853666A Expired - Lifetime US3635598A (en) 1968-09-05 1969-08-28 Diaphragm pump

Country Status (4)

Country Link
US (1) US3635598A (enrdf_load_stackoverflow)
DE (1) DE1728171A1 (enrdf_load_stackoverflow)
FR (1) FR2017422A1 (enrdf_load_stackoverflow)
GB (1) GB1258956A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4153394A (en) * 1977-02-28 1979-05-08 Kyosan Denki Kabushiki Kaisha Fuel pump
US4256020A (en) * 1979-10-01 1981-03-17 Acf Industries, Incorporated Crashworthy fuel pump improvement
US4295414A (en) * 1979-08-09 1981-10-20 Kyosan Denki Kabushiki Kaisha Diaphragm-type fuel pump
DE3042251A1 (de) * 1980-11-08 1982-05-27 Pierburg Gmbh & Co Kg, 4040 Neuss Kraftstoffmembranpumpe fuer brennkraftmaschine
US4743169A (en) * 1984-08-25 1988-05-10 Aisin Seiki Kabushiki Kaisha Diaphragm-type vacuum pump device
US4792293A (en) * 1987-09-21 1988-12-20 Meiko Pet Corporation Air pump assembly for a fish bowl

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5322308U (enrdf_load_stackoverflow) * 1976-08-05 1978-02-24
DE3003832C2 (de) * 1980-02-02 1982-07-22 Pierburg Gmbh & Co Kg, 4040 Neuss Pumpe, insbesondere Membranpumpe
DE3209252A1 (de) * 1981-03-31 1982-10-07 Fichtel & Sachs Ag, 8720 Schweinfurt Membranpumpe

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3200758A (en) * 1963-08-15 1965-08-17 Gen Motors Corp Diaphragm fuel pump with vent
US3304880A (en) * 1964-11-06 1967-02-21 Gen Motors Corp Pump and diaphragm plunger sub-assembly

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3200758A (en) * 1963-08-15 1965-08-17 Gen Motors Corp Diaphragm fuel pump with vent
US3304880A (en) * 1964-11-06 1967-02-21 Gen Motors Corp Pump and diaphragm plunger sub-assembly

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4153394A (en) * 1977-02-28 1979-05-08 Kyosan Denki Kabushiki Kaisha Fuel pump
US4295414A (en) * 1979-08-09 1981-10-20 Kyosan Denki Kabushiki Kaisha Diaphragm-type fuel pump
US4256020A (en) * 1979-10-01 1981-03-17 Acf Industries, Incorporated Crashworthy fuel pump improvement
DE3042251A1 (de) * 1980-11-08 1982-05-27 Pierburg Gmbh & Co Kg, 4040 Neuss Kraftstoffmembranpumpe fuer brennkraftmaschine
US4743169A (en) * 1984-08-25 1988-05-10 Aisin Seiki Kabushiki Kaisha Diaphragm-type vacuum pump device
US4792293A (en) * 1987-09-21 1988-12-20 Meiko Pet Corporation Air pump assembly for a fish bowl

Also Published As

Publication number Publication date
FR2017422A1 (enrdf_load_stackoverflow) 1970-05-22
GB1258956A (enrdf_load_stackoverflow) 1972-01-05
DE1728171A1 (de) 1972-04-06

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