초록

A carburetor for a gas powered internal combustion engine having a plurality of pressure reducing stages for reducing the pressure of the gas phase in a liquified petroleum gas storage bottle prior to the mixing of the gas phase of the liquified petroleum gas with ambient air.

대표청구항 ▼

1. A carburetor for a gas powered engine comprising, in combination: a body member;first walls in said body member defining a first stage pressure regulating chamber in said body member having a first stage gas inlet port providing gas flow passage into said first stage pressure regulating chamber f

1. A carburetor for a gas powered engine comprising, in combination: a body member;first walls in said body member defining a first stage pressure regulating chamber in said body member having a first stage gas inlet port providing gas flow passage into said first stage pressure regulating chamber for accepting a gas flow at a first gas pressure, a first stage gas outlet port, a first stage diaphragm for regulating gas pressure in said first stage pressure regulating chamber and mounted for movement towards and away from said first stage gas inlet port, a first stage metering lever pivotally mounted in said first stage pressure regulating chamber and having a first end for movement towards and away from gas inlet port, a second end spaced from said first end and a pivot pin connection for said pivotal mounting thereof intermediate said first end and said second end and said second end connected to said first stage diaphragm to provide movement of said first end of said first stage metering lever selectively into and out of blocking relationship to said first stage gas inlet port for corresponding movement of said first stage diaphragm away from and towards said first stage gas inlet port to regulate the flow of gas into said first stage pressure regulating chamber to provide a gas pressure in said first stage pressure regulating chamber at a second gas pressure lower than said first gas pressure, and said first stage pressure regulating chamber having a first gas volume;second walls in said body member defining a second stage pressure regulating chamber in said body member having a second stage gas inlet port providing gas flow passage into said second stage pressure regulating chamber for accepting a gas flow at said second gas pressure, a second stage gas outlet port, a second stage diaphragm for regulating gas pressure in said second stage pressure regulating chamber and mounted for movement towards and away from said second stage gas inlet port, a second stage metering lever pivotally mounted in said second stage pressure regulating chamber and having a first end for movement towards and away from said second stage gas inlet port, a second end spaced from said first end and a pivot pin connection for providing said pivotal mounting thereof intermediate said first end and said second end and said second end connected to said second stage diaphragm to provide movement of said second end of said second stage metering lever selectively into and out of blocking relationship to said second stage gas inlet port for corresponding movement of said second stage diaphragm away from and towards said first stage gas inlet port to regulate the flow of gas into said second stage pressure regulating chamber to provide a gas pressure in said second stage pressure regulating chamber at a third gas pressure lower than said first gas pressure and said second gas pressure, and said second stage pressure regulating chamber having a second gas volume less than said first gas volume of said first stage pressure regulating chamber;first gas flow passage walls in said body member defining a first gas flow passage providing communication between said first stage pressure regulating chamber and said second stage pressure regulating for allowing the flow of gas from said first stage pressure regulating chamber into said second stage pressure regulating chamber;third walls in said body member defining a metering chamber in said body member having a metering chamber gas inlet port providing a gas flow passage into said metering chamber for accepting a gas flow at said second gas pressure, a metering chamber gas outlet port, a metering chamber diaphragm for regulating gas pressure in said metering chamber and mounted for movement towards and away from said metering chamber gas inlet port, a metering chamber gas flow lever pivotally mounted in said metering chamber and having a first end for movement towards and away from said metering chamber gas inlet port, a second end spaced from said first end and a pivot pin connection for said pivotal mounting thereof intermediate said first end and said second end and said second end operatively connected to said metering chamber diaphragm to provide movement of said first end of said metering chamber gas flow lever selectively towards and away from said metering chamber gas inlet port, a needle member operatively connected to said second end of said metering chamber gas flow lever for movement into and out of said metering chamber gas inlet port for metering the flow of gas into said metering chamber for corresponding movement of said metering chamber diaphragm away from and towards said metering chamber gas inlet port to provide a gas pressure in said metering chamber at a fourth gas pressure lower than said first gas pressure, said second gas pressure and said third gas pressure, and said metering chamber having a third gas volume less than said second gas volume;fourth walls in said body member defining a throttle bore having an ambient air inlet port for allowing the flow of ambient air from regions external said body member into said throttle bore;fifth walls in said body member defining a gas flow passage providing communication between said metering chamber and said throttle bore to allow the flow of gas from said metering chamber into said throttle bore for mixing with said ambient air to provide an air/gas mixture;sixth walls in said body member defining an air/gas mixture outlet port for allowing the flow of the air/gas mixture to regions external said body member. 2. The arrangement defined in claim 1 and further comprising: seventh walls in said body member defining a throttle control chamber providing communication with said throttle bore;a throttle slide movably mounted in said throttle control chamber for reciprocating motion therein;a throttle needle connected to said throttle slide having a needle end for selective movement into and out of said gas outlet port of said metering chamber for controlling the flow of gas into said throttle bore;a throttle cable operatively connected to said throttle slide for moving said throttle slide in said throttle control chamber. 3. The arrangement defined in claim 1 and further comprising: a first stage pressure regulating chamber diaphragm cap mounted on said body member in regions adjacent said first stage pressure regulating chamber diaphragm;a first stage diaphragm pressure plate bearing against said first stage diaphragm;a first stage biasing spring intermediate said first stage diaphragm pressure plate and said first stage diaphragm for biasing said first stage diaphragm towards said first stage pressure regulating chamber gas inlet port;a first stage screw member having a first end bearing against said first stage biasing spring and a second end threadingly engaging said first stage pressure regulating chamber diaphragm cap;a control knob external said body member coupled to said first sage screw member external said carburetor body for selectively compressing and relaxing said first stage biasing spring to selectively open and close said first stage gas inlet port. 4. The arrangement defined in claim 1 and further comprising: a second stage pressure regulating chamber diaphragm cap mounted on said body member in regions adjacent said second stage pressure regulating chamber diaphragm;a second stage biasing spring intermediate said second stage diaphragm pressure plate and said second stage diaphragm cap for biasing said second stage diaphragm towards said second stage pressure regulating chamber gas inlet port. 5. The arrangement defined in claim 2 and further comprising: a first stage pressure regulating chamber diaphragm cap mounted on said body member in regions adjacent said first stage pressure regulating chamber diaphragm;a first stage diaphragm pressure plate bearing against said first stage diaphragm;a first stage biasing spring intermediate said first stage diaphragm pressure plate and said first stage diaphragm for biasing said first stage diaphragm towards said first stage pressure regulating chamber gas inlet port;a first stage screw member having a first end bearing against said first stage biasing spring and a second end threadingly engaging said first stage pressure regulating chamber diaphragm cap;a control knob external said body member coupled to said first sage screw member for selectively compressing and relaxing said first stage biasing spring to selectively open and close said first stage gas inlet port. 6. The arrangement defined in claim 5 and further comprising: a second stage pressure regulating chamber diaphragm cap mounted on said body member in regions adjacent said second stage pressure regulating chamber diaphragm;a second stage biasing spring intermediate said second stage diaphragm pressure plate and said second stage diaphragm cap for biasing said second stage diaphragm towards said second stage pressure regulating chamber gas inlet port. 7. The arrangement defined in claim 1 wherein: said first gas volume of said first stage pressure regulating chamber is on the order of 1.6 times the volume of said second gas volume of said second stage pressure regulating chamber. 8. The arrangement defined in claim 1 wherein: said second gas volume of said second stage pressure regulating is on the order of 2.5 times the volume of said third gas volume of said metering chamber. 9. The arrangement defined in claim 7 wherein: said second gas volume of said second stage pressure regulating is on the order of 2.5 times the volume of said third gas volume of said metering chamber. 10. The arrangement defined in claim 2 wherein: said first gas volume of said first stage pressure regulating chamber is on the order of 1.6 times the volume of said second gas volume of said second stage pressure regulating chamber. 11. The arrangement defined in claim 2 wherein: said second gas volume of said second stage pressure regulating is on the order of 2.5 times the volume of said third gas volume of said metering chamber. 12. The arrangement defined in claim 11 wherein: said first gas volume of said first stage pressure regulating chamber is on the order of 1.6 times the volume of said second gas volume of said second stage pressure regulating chamber. 13. The arrangement defined in claim 2 and further comprising: said first stage pressure regulating chamber diaphragm has an inner surface facing said first stage pressure regulating chamber and an outer surface facing away from first stage pressure regulating chamber;a first stage pressure regulating chamber diaphragm cap mounted on said body member in regions adjacent said outer surface of said first stage pressure regulating chamber diaphragm;a first stage diaphragm pressure plate bearing against said outer surface of said first stage diaphragm;a first stage biasing spring intermediate said first stage diaphragm pressure plate and said first stage diaphragm for biasing said first stage diaphragm towards said first stage pressure regulating chamber gas inlet port;a first stage screw member having a first end bearing against said first stage biasing spring and a second end threadingly engaging said first stage pressure regulating chamber diaphragm cap;a control knob external said body member coupled to said first sage screw member for selectively compressing and relaxing said first stage biasing spring to selectively open and close said first stage gas inlet port. 14. The arrangement defined in claim 13 and further comprising: said second stage pressure regulating chamber diaphragm has an inner surface facing said second stage pressure regulating chamber and an outer surface facing away from said second stage pressure regulating chamber;a second stage pressure regulating chamber diaphragm cap mounted on said body member in regions adjacent said outer surface of said second stage pressure regulating chamber diaphragm;a second stage biasing spring intermediate said second stage diaphragm pressure plate and said second stage diaphragm cap for biasing said second stage diaphragm towards said second stage pressure regulating chamber gas inlet port. 15. The arrangement defined in claim 14 and further comprising: said metering chamber diaphragm has an inner surface facing said metering chamber and an outer surface facing away from said metering chamber;a metering chamber diaphragm cap mounted on said body member in regions adjacent said metering chamber diaphragm. 16. The arrangement defined in claim 15 and further comprising: at least one of said first stage pressure regulating chamber diaphragm cap and said second stage pressure regulating chamber diaphragm cap and said metering chamber diaphragm cap has walls defining an aperture therethrough. 17. The arrangement defined in claim 16 and further comprising: said first stage pressure regulating chamber diaphragm cap has walls defining an aperture therethrough to vent said outer face of said first stage pressure regulating chamber diaphragm to atmospheric pressure. 18. The arrangement defined in claim 15 and further comprising: second stage pressure regulating chamber diaphragm cap has walls defining an aperture therethrough to vent said outer face of said second stage pressure regulating chamber diaphragm to atmospheric pressure. 19. The arrangement defined in claim 15 and further comprising: metering chamber diaphragm cap has walls defining an aperture therethrough to vent said outer face of said metering chamber diaphragm to atmospheric pressure. 20. The arrangement defined in claim 15 and further comprising: each of said first stage pressure regulating chamber diaphragm cap and said second stage pressure regulating chamber diaphragm cap and said metering chamber diaphragm cap has walls defining an aperture therethrough for providing ventilation to atmospheric pressure therethrough. 21. The arrangement defined in claim 15 and further comprising: a bearing plate mounted on said inner surface of said metering chamber diaphragm. 22. The arrangement defined in claim 21 and further comprising: a rivet extending through said bearing plate and said metering chamber diaphragm. 23. The arrangement defined in claim 22 and further comprising: said second end of said metering chamber gas flow lever is in contact with said rivet;a biasing spring member having a first end engaging said third walls of said body member and a second end engaging said second end of said metering chamber gas flow lever for biasing said second end of said metering chamber gas flow lever into contact with said rivet. 24. A carburetor for a gas powered engine comprising, in combination: a body member;first walls in said body member defining a first stage pressure regulating chamber in said body member having a first stage gas inlet port providing a gas flow passage into said first stage pressure regulating chamber, a first stage diaphragm for regulating gas pressure in said first stage pressure regulating chamber in a first preselected gas pressure range, a first stage metering lever movably mounted in said first stage pressure regulating chamber and operatively connected to said first stage diaphragm for selectively opening and closing said first stage gas inlet port in response to movement of said first stage diaphragm, and said first stage pressure regulating chamber having a first gas volume;second walls in said body member defining a second stage pressure regulating chamber in said body member having a second stage gas inlet port providing a gas flow passage into said second stage pressure regulating chamber for accepting a gas flow from said first stage pressure regulating chamber, a second stage gas outlet port, a second stage diaphragm for regulating gas pressure in said second stage pressure regulating chamber in a second preselected gas pressure range, and a second stage metering lever pivotally mounted in said second stage pressure regulating chamber and operatively connected to said second stage diaphragm for selectively opening and closing said second stage gas inlet port to provide to regulate gas pressure in said second stage pressure regulating chamber in a second preselected gas pressure range lower than said first preselected gas pressure range, and said second stage pressure regulating chamber having a second gas volume less than said first gas volume of said first stage pressure regulating chamber;first gas flow passage walls in said body member defining a first gas flow passage providing communication between said first stage pressure regulating chamber and said second stage pressure regulating for allowing the flow of gas from said first stage pressure regulating chamber into said second stage pressure regulating chamber;third walls in said body member defining a metering chamber in said body member having a metering chamber gas inlet port providing a gas flow passage into said metering chamber for accepting a gas flow from said second stage pressure regulating chamber, a metering chamber diaphragm for operatively metering the flow of gas through said metering chamber and said metering chamber having a third gas volume less than said second gas volume;fourth walls in said body member defining a throttle bore having an ambient air inlet port for allowing the flow of ambient air from regions external said body member into said throttle bore;fifth walls in said body member defining a gas flow passage providing communication between said metering chamber and said throttle bore to allow the flow of gas from said metering chamber into said throttle bore for mixing with said ambient air to provide an air/gas mixture;sixth walls in said body member defining an air/gas mixture outlet port for allowing the flow of the air/gas mixture to regions external said body member. 25. The arrangement defined in claim 24 and further comprising: seventh walls in said body member defining a throttle control chamber providing communication with said throttle bore;a throttle slide movably mounted in said throttle control chamber for reciprocating motion therein;a throttle needle connected to said throttle slide having a needle end for selective movement into and out of said gas outlet port of said metering chamber for controlling the flow of gas into said throttle bore;a throttle cable operatively connected to said throttle slide for moving said throttle slide in said throttle control chamber. 26. The arrangement defined in claim 24 wherein: said first preselected gas pressure range is on the order of 10 to 50 pounds per square inch. 27. The arrangement defined in claim 26 wherein: said second preselected gas pressure range is on the order of 0.2 to 0.5 pounds per square inch. 28. The arrangement defined in claim 27 and further comprising: a first stage pressure regulating chamber diaphragm cap mounted on said body member in regions adjacent said first stage pressure regulating chamber diaphragm;a first stage diaphragm pressure plate bearing against said first stage diaphragm;a first stage biasing spring intermediate said first stage diaphragm pressure plate and said first stage diaphragm for biasing said first stage diaphragm towards said first stage pressure regulating chamber gas inlet port;a first stage screw member having a first end bearing against said first stage biasing spring and a second end threadingly engaging said first stage pressure regulating chamber diaphragm cap;a control knob external said body member coupled to said first stage screw member for selectively compressing and relaxing said first stage biasing spring to selectively open and close said first stage gas inlet port. 29. The arrangement defined in claim 28 and further comprising: a second stage pressure regulating chamber diaphragm cap mounted on said body member in regions adjacent said second stage pressure regulating chamber diaphragm;a second stage biasing spring intermediate said second stage diaphragm pressure plate and said second stage diaphragm cap for biasing said second stage diaphragm towards said second stage pressure regulating chamber gas inlet port. 30. The arrangement defined in claim 29 wherein: said first gas volume of said first stage pressure regulating chamber is on the order of 1.5 times the volume of said second gas volume of said second stage pressure regulating chamber. 31. The arrangement defined in claim 30 wherein: said second gas volume of said second stage pressure regulating is on the order of 2.5 times the volume of said third gas volume of said metering chamber. 32. The arrangement defined in claim 31 wherein: said first gas volume of said first stage pressure regulating chamber is on the order of 1.6 cubic inches;said second gas volume of said second stage pressure regulating chamber is on the order of 1.0 cubic inches; and,said third gas volume of said metering chamber is on the order of 0.4 cubic inches. 33. The arrangement defined in claim 32 wherein: said first stage pressure regulating chamber has a surface area on the order of 8.7 square inches;said second stage pressure regulating chamber has surface area on the order of 7.5 square inches; and,said metering chamber has a surface area on the order of 3.2 square inches. 34. A carburetor for connection to a gas powered engine for receiving gas phase and/or liquid phase and or a mixture of gas phase and liquid phase of liquified petroleum gas from a liquified petroleum gas storage container wherein the liquified gas storage container has both a liquid phase and a gas phase of said liquified gas therein and said gas phase is at a storage gas pressure on the order of 150 pounds per square inch, and comprising, in combination: a body member;first walls in said body member defining a first stage pressure regulating chamber in said body member having a first stage gas inlet port for receiving at least one of a gas phase, a mixture of gas phase and liquid phase and liquid phase of liquified petroleum gas from the liquified petroleum storage bottle, a first stage diaphragm movably mounted in said first stage pressure regulating chamber for regulating the gas pressure of the gas in said first stage pressure regulating chamber in a first preselected gas pressure range less than said storage gas pressure, and said first stage pressure regulating chamber having a first gas volume and a first surface area;second walls in said body member defining a second stage pressure regulating chamber in said body member for receiving gas from said first stage pressure regulating chamber, a second stage diaphragm movably mounted in said second stage pressure regulating chamber for regulating the gas pressure of the gas in said second stage pressure regulating chamber in a second preselected gas pressure range, lower than said first preselected gas pressure range, and said second stage pressure regulating chamber having a second gas volume less than said first gas volume of said first stage pressure regulating chamber and a second surface area less than said first surface area;first gas flow passage walls in said body member defining a first gas flow passage providing communication between said first stage pressure regulating chamber and said second stage pressure regulating for allowing the flow of gas from said first stage pressure regulating chamber into said second stage pressure regulating chamber;third walls in said body member defining a metering chamber in said body member having a metering chamber for receiving gas from said second stage pressure regulating chamber, a metering chamber diaphragm movably mounted in said metering chamber for regulating the gas pressure in said metering chamber within a third preselected gas pressure range lower than said second preselected gas pressure range, and said metering chamber having a third gas volume less than said second gas volume and a third surface area less than said second surface area;fourth walls in said body member defining a throttle bore having an ambient air inlet port for allowing the flow of ambient air from regions external said body member into said throttle bore;fifth walls in said body member defining a gas flow passage providing communication between said metering chamber and said throttle bore to allow the flow of gas from said metering chamber into said throttle bore for mixing with said ambient air to provide an air/gas mixture;sixth walls in said body member defining an air/gas mixture outlet port for allowing the flow of the air/gas mixture to regions external said body member. 35. The arrangement defined in claim 34 wherein: said first gas volume of said first stage pressure regulating chamber is on the order of 1.6 times the volume of said second gas volume of said second stage pressure regulating chamber and said second gas volume of said second stage pressure regulating chamber is on the order of 2.5 times said third gas volume of said metering chamber. 36. The arrangement defined in claim 34 wherein: said first preselected gas pressure in said first stage pressure regulating chamber is in the range of 10.0 to 50.0 pounds per square inch;said second preselected gas pressure in said second stage pressure regulating chamber is on the order of 0.5 pounds per square inch; and,said gas pressure in said metering chamber is in the range of atmospheric pressure to a small vacuum pressure. 37. The arrangement defined in claim 34 wherein: said first gas volume of said first stage pressure regulating chamber is on the order of 1.6 cubic inches, and said first stage pressure regulating chamber has a surface area on the order of 8.7 square inches;said second gas volume of said second stage pressure regulating chamber is on the order of 1.0 cubic inches, and said second stage pressure regulating chamber has a surface area on the order of 7.5 square inches; and,said third gas volume of said metering chamber is on the order of 0.4 cubic inches, and said metering chamber has a surface area on the order of 3.2 square inches;said first stage pressure regulating chamber diaphragm has an inner surface facing said first stage pressure regulating chamber and an outer surface facing away from first stage pressure regulating chamber;a first stage pressure regulating chamber diaphragm cap mounted on said body member in regions adjacent said outer surface of said first stage pressure regulating chamber diaphragm;a first stage diaphragm pressure plate bearing against said outer surface of said first stage diaphragm;a first stage biasing spring intermediate said first stage diaphragm pressure plate and said first stage diaphragm for biasing said first stage diaphragm towards said first stage pressure regulating chamber gas inlet port;a first stage screw member having a first end bearing against said first stage biasing spring and a second end threadingly engaging said first stage pressure regulating chamber diaphragm cap;a control knob external said body member coupled to said first sage screw member for selectively compressing and relaxing said first stage biasing spring to selectively open and close said first stage gas inlet port; and, wherein said body member is mounted in heat receiving relationship to the engine.