US3359915A - Diaphragm pump with closed spring chamber - Google Patents

Diaphragm pump with closed spring chamber Download PDF

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Publication number
US3359915A
US3359915A US509725A US50972565A US3359915A US 3359915 A US3359915 A US 3359915A US 509725 A US509725 A US 509725A US 50972565 A US50972565 A US 50972565A US 3359915 A US3359915 A US 3359915A
Authority
US
United States
Prior art keywords
diaphragm
spring
pump
spring chamber
chamber
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
US509725A
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English (en)
Inventor
Toschkoff Dimitar
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.)
Motors Liquidation Co
Original Assignee
Motors Liquidation Co
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 Motors Liquidation Co filed Critical Motors Liquidation Co
Priority to US509725A priority Critical patent/US3359915A/en
Priority to GB50434/66A priority patent/GB1093190A/en
Priority to FR84984A priority patent/FR1501598A/fr
Application granted granted Critical
Publication of US3359915A publication Critical patent/US3359915A/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

  • This invention relates to a diaphragm fuel pump and more particularly to an automotive fuel pump in which a spring chamber is unvented and substantially of constant volume and also to a sub-assembly for such a pump.
  • FIGURE 1 shows a cross-sectional view of a fuel pump, the latter being connected to an indicator switch and warning circuit, the pump per se and the combination being in accordance with the teachings of the present invention
  • FIGURE 2 shows a cross-sectional view of a modified version of the pump with no indicator being employed.
  • the pump of FIGURE 1 is provided with a sheet metal structure 10 much like that of application S.N. 489,104. It includes a fuel inlet at 12 and an outlet 14 and is similarly driven as by a rocker arm 16 pivoted at 18 on a pump body 20.
  • the arm 16 conventionally cooperates with a spring 22 to reciprocate a plunger 24 and a pumping diaphragm 26 as well as diaphragm retainer plates 28 and 30.
  • the body 20 is made with a spring cavity 32 which is closed to the atmosphere.
  • a threaded boss 34 is made integral with the body and connects the spring cavity 32 by means of a line 36 to a pressure switch 38.
  • this switch When supplied with pressure this switch is adapted to close a circuit 39 which in turn may cause a lamp 41 to glow or some suitable device to make a warning sound.
  • a switch is disclosed in the US. Patent 3,109,908 granted Nov. 5, 1963, in the name of B. H. Clason.
  • the lower portion of the body 20 is open at 40 to communicate with the crankcase of a supporting internal combustion engine.
  • gasoline will enter the crankcase and damage the engine except for the presence of a seal usually provided between the diaphragm plunger and the pump body.
  • vents have been located between the pumping diaphragm and oil seal as the pumping diaphragm displaces large volumes of air as it reciprocates.
  • the vents of prior pumps are carefully designed to prevent noise and to keep dirt out.
  • the vents however, increase the possibility of fire and the air contacting a given pumping diaphragm tends to dry out one side of the latter. Such drying shortens the life of the pumping diaphragm.
  • a rigid member 42 is 3,359,915 Patented Dec. 26, 1967 provided to bridge the space 40.
  • This member may be made of metal or plastic and is slidable with respect to the plunger 24 and is perforated as at 44 to vent a chamber 46 defined between the rigid member 42 and a flexible sealing diaphragm 48.
  • An annular retainer 50 is urged downwardly by a pumping spring 52 tightly to hold the peripheries of the sealing diaphragm 48 and the rigid member 42 with respect to the body 20.
  • the diaphragm 48 has a thickened hub 54 tightly held on the plunger 24 to move therewith.
  • the retainer 50 aids in preventing a reversal of curvature in the diaphragm 48 as well as serving as a spring seat.
  • the chamber 32 need not be vented as there is no change in volume as the plunger 24 reciprocates. Chamber 46, however, does change in volume and the ports or vents 44 take care' of this. With this arrangement, a large diameter spring 52 may be used which is lower in cost than a smaller diameter spring. A low spring rate improves the pump discharge rate and with no vent, there is less danger of fire and pump operation is quiet.
  • the pumping diaphragm 26 should rupture, the pressure in chamber 32 would rise and the resultant closure of the switch 38 would trigger a signal at a remote area such as on a vehicle instrument panel. If this feature is not required the boss 34 could be plugged.
  • a pump body 20' is disclosed and which is similar to the body 20 of FIGURE 1 except that no boss or connection to an indicator switch is provided for, i.e., its wall 21 surrounding the spring 52 is imperforate. As in FIGURE 1, there is no vent to atmosphere.
  • a rigid member 42 with holes 44 is again used with a large diameter spring 52, a retainer 50, and a plunger 24.
  • a sealing diaphragm 48 is used which has an annular trough 60 giving the diaphragm greater flexibility so that the spring chamber 62 volume may have some variation although remain substantially constant during each pump cycle.
  • a pump including a pump body, a pumping diaphragm, a flexible sealing diaphragm, a rigid sealing member with a port therein, a plunger slidable in said rigid member and fixed to said diaphragms, said rigid sealing member and flexible sealing diaphragm having annular troughs therein surrounding said plunger and extending toward said pumping diaphragm so that said rigid sealing member may prevent reversal of curvature of said sealing diaphragm, a spring surrounding said plunger, an annular spring retainer forming a seat for one end of said spring, said body and diaphragms cooperating to define a closed chamber of substantially constant volume and enclosing said spring with said pump body having an imperforate wall surrounding said spring, and said sealing diaphragm and rigid member defining an annular chamber of variable volume and encompassed by said annular spring retainer.

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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)
US509725A 1965-11-26 1965-11-26 Diaphragm pump with closed spring chamber Expired - Lifetime US3359915A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US509725A US3359915A (en) 1965-11-26 1965-11-26 Diaphragm pump with closed spring chamber
GB50434/66A GB1093190A (en) 1965-11-26 1966-11-10 Diaphragm pumps
FR84984A FR1501598A (fr) 1965-11-26 1966-11-25 Pompe à diaphragme

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US509725A US3359915A (en) 1965-11-26 1965-11-26 Diaphragm pump with closed spring chamber

Publications (1)

Publication Number Publication Date
US3359915A true US3359915A (en) 1967-12-26

Family

ID=24027848

Family Applications (1)

Application Number Title Priority Date Filing Date
US509725A Expired - Lifetime US3359915A (en) 1965-11-26 1965-11-26 Diaphragm pump with closed spring chamber

Country Status (3)

Country Link
US (1) US3359915A (fr)
FR (1) FR1501598A (fr)
GB (1) GB1093190A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54175602U (fr) * 1978-06-01 1979-12-12

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5322308U (fr) * 1976-08-05 1978-02-24
JPS5362204A (en) * 1976-11-16 1978-06-03 Kyosan Denki Kk Seal device for mechanical type fuel pump

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1885121A (en) * 1929-02-02 1932-11-01 Hydraulic Brake Co Valve mechanism
US2102797A (en) * 1936-04-17 1937-12-21 Helmer Theodore Kenneth Piston rod protector
US2323950A (en) * 1940-05-14 1943-07-13 John B Wade Proportional feeder
US2770799A (en) * 1953-07-24 1956-11-13 Charles H Horn Emergency diaphragm for air brakes and the like
US2873688A (en) * 1955-11-18 1959-02-17 Gen Motors Corp Pump with oblique pulsator diaphragm
US3135218A (en) * 1962-11-23 1964-06-02 Gen Motors Corp Pump with lost motion structure about diaphragm plunger

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1885121A (en) * 1929-02-02 1932-11-01 Hydraulic Brake Co Valve mechanism
US2102797A (en) * 1936-04-17 1937-12-21 Helmer Theodore Kenneth Piston rod protector
US2323950A (en) * 1940-05-14 1943-07-13 John B Wade Proportional feeder
US2770799A (en) * 1953-07-24 1956-11-13 Charles H Horn Emergency diaphragm for air brakes and the like
US2873688A (en) * 1955-11-18 1959-02-17 Gen Motors Corp Pump with oblique pulsator diaphragm
US3135218A (en) * 1962-11-23 1964-06-02 Gen Motors Corp Pump with lost motion structure about diaphragm plunger

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54175602U (fr) * 1978-06-01 1979-12-12
JPS5847265Y2 (ja) * 1978-06-01 1983-10-28 三菱自動車工業株式会社 内燃機関用ダイアフラム付メカニカル式燃料ポンプ

Also Published As

Publication number Publication date
GB1093190A (en) 1967-11-29
FR1501598A (fr) 1967-11-10

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