US2406973A - Altitude compensator for fuel pumps - Google Patents
Altitude compensator for fuel pumps Download PDFInfo
- Publication number
- US2406973A US2406973A US467134A US46713442A US2406973A US 2406973 A US2406973 A US 2406973A US 467134 A US467134 A US 467134A US 46713442 A US46713442 A US 46713442A US 2406973 A US2406973 A US 2406973A
- Authority
- US
- United States
- Prior art keywords
- valve
- pressure
- pump
- aneroid
- fuel
- 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
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Classifications
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- 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
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/20—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines characterised by means for preventing vapour lock
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- 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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
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- 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
- F02M2700/13—Special devices for making an explosive mixture; Fuel pumps
- F02M2700/1317—Fuel pumpo for internal combustion engines
- F02M2700/1364—Fuel pump controlled by means of a fuel return valve
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/2496—Self-proportioning or correlating systems
- Y10T137/2559—Self-controlled branched flow systems
- Y10T137/2574—Bypass or relief controlled by main line fluid condition
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7781—With separate connected fluid reactor surface
Definitions
- the object of the invention is to provide for maintaining substantially constant absolute pressure, regardless of altitude, on the bypass valve or other pressure regulating mechanism of an airplane fuel pump.
- Other objects such as simplicity and eiiiciency will be understood from the description which follows.
- Figure l is a transverse section through a fuel pump combined with a bypass and having my improvement incorporated therein.
- Figure 2 is a section on line 2-2 of Figure 1.
- a pump housing On the drawing, numeral is used to identify a pump housing. It has an inlet 9 to receive fuel from a suitable source and an outlet I for connection to the carburetor. Between the inlet and outlet is a pump barrel II within which is an eccentric rotor I3 -carrying the blades I5 and spacing roller I1 as in prior pumps. Above th'e housing 5 is a bypass Valve support I9 and above part I9 is a dome-shaped cover 2
- Part I9 has an upper transverse but apertured wall 25, an intermediate transverse partition 21, and a circular inner tubular part 2S which latter is reduced in diameter at 3l to telescope within a similar sleeve part 33 of body 5. Between pump parts IS and 2
- of th'e assembly is open to the atmosphere at 55.
- a threaded member 51 in its upper face adjustably positions the upper abutment 59 of a spring 6I.
- a sealed bellows or aneroid 63 of known construction is secured to abutment 59. Its lower end contacts the diaphragm 35.
- Spring El is within the bellows and exerts pressure on its lower face and on the dia- 5 Claims. (Cl. 10B- 42) phragm and valve, being operable to bias the valve upon its seat.
- the operation of the device is as follows. is important that the absolute fuel pressure for the carburetor should be substantially constant or should not fall 01T in proportion to the decrease of atmospheric pressure with increases in altitudes.
- the pump capacity must be such that the pump outlet pressure always tends to exceed the desired carburetor pressure.
- the bypass valve is at all times open, at least to some extent. The pressure at the pump outlet in excess of the constant pressure needed opens the valve, the underside of the diaphragm (which is greater in area than the bypass valve) being always in communication with the pump outlet by way of passages 4'I, 45 and 43. 'Ih'e fuel returns to the low pressure side of the pump by way of passage 49 and 53.
- the constant pressure desired is maintained by the proper adjustment at 51 of springs 6I
- the tendency of the sealed evacuated bellows to expand and exert pressure on the valve is partially balanced by the external pressure on the bellows.
- the reduced external air pressure permits the bellows spring 6I to exert increased pressure on the valve to maintain the pressure applied to the diaphragm and valve substantially constant.
- the pressure on the valve being the air pressure plus the spring pressure, would decrease as the plane reaches higher altitudes and with decreasing applied pressure the valve would open at too low pump pressures and insuicient fuel would be supplied to the carburetor.
- the diaphragm 35 performs the important function of preventing the fuel under the pressure conditions determined by the pump from reaching the space around the bellows with the result that the unbalance of air pressures is free to operate as stated.
- a fuel pump having a pressure regulator by-pass, a valve therefor, a spring and an altitude sensitive aneroid jointly Operable on said valve, an air vented chamber containing said spring and aneroid and a flexible diaphragm connected to said valve and separating said aneroid chamber from said bypass the dimensions of the aneroid and the diaphragm being such that the air pressure within the chamber exerts a force on the diaphragm tending to close the valve substantially equal to the force of said air pressure 3 acting on the aneroid in a direction t0 open the valve.
- a bypass between the high pressure and low pressure sides of said pump, a valve to close said bypass, a spring and an altitude sensitivel aneroid operable jointly to bias said valve to closed position, an air vented chamber containing said aneroid, and a. diaphragm sealing said ch'amber from said by- ⁇ pass the dimensions of the aneroid and the diaphragm being such that the air pressure within the chamber exerts a force on the diaphragm tending to close the valve substantially equal, 5.0 the force of said air pressure acting on the aneroid in a direction to open the valve.
- said aneroid comprising a sealed and partially evacu; ated bellows having a fixed abutment, at one end, th'e other end operably associated with said valve to exert thereon variable pressures dependent upon external air pressure.
- a fuel pump having a pressure regulating by-pass valve, means forming a chamber associated with said fuel pump, movable means secured to said valve and separating said pump from said chamber, said chamber being open to the surrounding air, a sealed aneroid and a spring within said chamber and jointly operable on said movable means, the dimensions of the aneroid and the movable means being such that the air pressure with'in the chamber exerts a force on the movable member tending to close the valve substantially equal to the force of said air acting on the aneroid in a direction to open the valve.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
Description
Sepf 3,1946' M. A. 'rRlsLER A 2,406,973
ALTITUDE COMPENSATOR FOR FUEL PUMPS Filed Nov. 2'7, 1942 Snnentor Patented Sept. 3, 1946 ALTITUDE COMPENSATOR FOR FUEL PUM Milton A. Trisler, Indianapolis, Ind., assignor to General Motors Corporation, Detroit, Mich., a corporation of Delaware Application November 27, 1942, Serial No. 467,134
An improvement in a pump serving to supply fuel to the engine of an airplane constitutes the subject matter of this invention.
The object of the invention is to provide for maintaining substantially constant absolute pressure, regardless of altitude, on the bypass valve or other pressure regulating mechanism of an airplane fuel pump. Other objects such as simplicity and eiiiciency will be understood from the description which follows.
An embodiment of the invention is shown by the accompanying drawing in which:
Figure l is a transverse section through a fuel pump combined with a bypass and having my improvement incorporated therein.
Figure 2 is a section on line 2-2 of Figure 1.
On the drawing, numeral is used to identify a pump housing. It has an inlet 9 to receive fuel from a suitable source and an outlet I for connection to the carburetor. Between the inlet and outlet is a pump barrel II within which is an eccentric rotor I3 -carrying the blades I5 and spacing roller I1 as in prior pumps. Above th'e housing 5 is a bypass Valve support I9 and above part I9 is a dome-shaped cover 2|, fastening means 23 securing the several parts together as shown.
Part I9 has an upper transverse but apertured wall 25, an intermediate transverse partition 21, and a circular inner tubular part 2S which latter is reduced in diameter at 3l to telescope within a similar sleeve part 33 of body 5. Between pump parts IS and 2| is secured a flexible diaphragm 35. On the under side of the diaphragm is a flanged disc 3'! integral with a tapered wall valve member 39 which engages a valve seat 4I on part 23. When the valve is seated the space above th'e valve and partition 2T is in communication with the discharge side of the pump by a passage i3 in the partitionizl and registering passages 45 and 41 in the pump members I9 and 5 respectively. The tubular part 29 is cut away to form an opening 49 by which the space within said part 29 is in communication through registering passages 5I and 53 in parts I9 and 5 with the low pressure (intake) side of the pump, the side leading from the fuel supply.
The part 2| of th'e assembly is open to the atmosphere at 55. A threaded member 51 in its upper face adjustably positions the upper abutment 59 of a spring 6I. A sealed bellows or aneroid 63 of known construction is secured to abutment 59. Its lower end contacts the diaphragm 35. Spring El is within the bellows and exerts pressure on its lower face and on the dia- 5 Claims. (Cl. 10B- 42) phragm and valve, being operable to bias the valve upon its seat.
The operation of the device is as follows. is important that the absolute fuel pressure for the carburetor should be substantially constant or should not fall 01T in proportion to the decrease of atmospheric pressure with increases in altitudes. To provide for all needs the pump capacity must be such that the pump outlet pressure always tends to exceed the desired carburetor pressure. In consequence the bypass valve is at all times open, at least to some extent. The pressure at the pump outlet in excess of the constant pressure needed opens the valve, the underside of the diaphragm (which is greater in area than the bypass valve) being always in communication with the pump outlet by way of passages 4'I, 45 and 43. 'Ih'e fuel returns to the low pressure side of the pump by way of passage 49 and 53. The constant pressure desired is maintained by the proper adjustment at 51 of springs 6I At sea level the tendency of the sealed evacuated bellows to expand and exert pressure on the valve is partially balanced by the external pressure on the bellows. When the device is used on an airplane, and the apparatus reaches higher elevations the reduced external air pressure permits the bellows spring 6I to exert increased pressure on the valve to maintain the pressure applied to the diaphragm and valve substantially constant. In the absence vof the bellows, the pressure on the valve being the air pressure plus the spring pressure, would decrease as the plane reaches higher altitudes and with decreasing applied pressure the valve would open at too low pump pressures and insuicient fuel would be supplied to the carburetor. It will be observed that the diaphragm 35 performs the important function of preventing the fuel under the pressure conditions determined by the pump from reaching the space around the bellows with the result that the unbalance of air pressures is free to operate as stated.
I claim:
1. In a fuel pump having a pressure regulator by-pass, a valve therefor, a spring and an altitude sensitive aneroid jointly Operable on said valve, an air vented chamber containing said spring and aneroid and a flexible diaphragm connected to said valve and separating said aneroid chamber from said bypass the dimensions of the aneroid and the diaphragm being such that the air pressure within the chamber exerts a force on the diaphragm tending to close the valve substantially equal to the force of said air pressure 3 acting on the aneroid in a direction t0 open the valve.
2. In a fuel pump, means forming a bypass between the high pressure and low pressure sides of said pump, a valve to close said bypass, a spring and an altitude sensitivel aneroid operable jointly to bias said valve to closed position, an air vented chamber containing said aneroid, and a. diaphragm sealing said ch'amber from said by-` pass the dimensions of the aneroid and the diaphragm being such that the air pressure within the chamber exerts a force on the diaphragm tending to close the valve substantially equal, 5.0 the force of said air pressure acting on the aneroid in a direction to open the valve.
3. The invention defined by claim 2, said aneroid comprising a sealed and partially evacu; ated bellows having a fixed abutment, at one end, th'e other end operably associated with said valve to exert thereon variable pressures dependent upon external air pressure.
4. The invention dened by claim 2, together with adjustable means to determine the resilient force applied by said spring.
5. In combination, a fuel pump having a pressure regulating by-pass valve, means forming a chamber associated with said fuel pump, movable means secured to said valve and separating said pump from said chamber, said chamber being open to the surrounding air, a sealed aneroid and a spring within said chamber and jointly operable on said movable means, the dimensions of the aneroid and the movable means being such that the air pressure with'in the chamber exerts a force on the movable member tending to close the valve substantially equal to the force of said air acting on the aneroid in a direction to open the valve.
MILTON A. TRISLER.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US467134A US2406973A (en) | 1942-11-27 | 1942-11-27 | Altitude compensator for fuel pumps |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US467134A US2406973A (en) | 1942-11-27 | 1942-11-27 | Altitude compensator for fuel pumps |
Publications (1)
Publication Number | Publication Date |
---|---|
US2406973A true US2406973A (en) | 1946-09-03 |
Family
ID=23854506
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US467134A Expired - Lifetime US2406973A (en) | 1942-11-27 | 1942-11-27 | Altitude compensator for fuel pumps |
Country Status (1)
Country | Link |
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US (1) | US2406973A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2551836A (en) * | 1945-06-29 | 1951-05-08 | Republic Aviat Corp | Regulator |
US2616254A (en) * | 1945-01-04 | 1952-11-04 | Bendix Aviat Corp | Jet engine fuel control for modifying fuel pressure drop across throttle in accordance with altitude |
US2636440A (en) * | 1949-07-25 | 1953-04-28 | Waukesha Foundry Co | Sanitary pump with infinitely variable output |
US2683418A (en) * | 1948-09-10 | 1954-07-13 | Bendix Aviat Corp | Pump |
US3103891A (en) * | 1959-10-01 | 1963-09-17 | Roper Hydraulics Inc | Unloading relief valve |
DE1169297B (en) * | 1956-03-08 | 1964-04-30 | Borg Warner | Fuel conveyor pump with rotating conveyor element |
US4077208A (en) * | 1973-09-04 | 1978-03-07 | Nissan Motor Company, Limited | Secondary air supply control device |
US20090029813A1 (en) * | 2007-07-18 | 2009-01-29 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Pressure relief valve for a hydraulic system |
-
1942
- 1942-11-27 US US467134A patent/US2406973A/en not_active Expired - Lifetime
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2616254A (en) * | 1945-01-04 | 1952-11-04 | Bendix Aviat Corp | Jet engine fuel control for modifying fuel pressure drop across throttle in accordance with altitude |
US2551836A (en) * | 1945-06-29 | 1951-05-08 | Republic Aviat Corp | Regulator |
US2683418A (en) * | 1948-09-10 | 1954-07-13 | Bendix Aviat Corp | Pump |
US2636440A (en) * | 1949-07-25 | 1953-04-28 | Waukesha Foundry Co | Sanitary pump with infinitely variable output |
DE1169297B (en) * | 1956-03-08 | 1964-04-30 | Borg Warner | Fuel conveyor pump with rotating conveyor element |
US3103891A (en) * | 1959-10-01 | 1963-09-17 | Roper Hydraulics Inc | Unloading relief valve |
US4077208A (en) * | 1973-09-04 | 1978-03-07 | Nissan Motor Company, Limited | Secondary air supply control device |
US20090029813A1 (en) * | 2007-07-18 | 2009-01-29 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Pressure relief valve for a hydraulic system |
US9841113B2 (en) * | 2007-07-18 | 2017-12-12 | Schaeffler Technologies AG & Co. KG | Pressure relief valve for a hydraulic system |
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