초록 ▼

A system and method for storage and delivery of a cryogenic mixed gas is disclosed, the storage apparatus including a compact and lightweight dewar for containing cryogenic temperature mixed gas at supercritical pressure. Different heat exchangers associated with the dewar provide for heat input to

A system and method for storage and delivery of a cryogenic mixed gas is disclosed, the storage apparatus including a compact and lightweight dewar for containing cryogenic temperature mixed gas at supercritical pressure. Different heat exchangers associated with the dewar provide for heat input to the dewar to maintain gas therein in a single phase and provide continued expulsion energy. A backpack receives the dewar and includes means for quick connect of the dewar with an end use outlet, intermediate heat exchangers in the backpack conditioning the mixed gas for end use. No electrical input for fluid circulation is required.

대표청구항 ▼

A system and method for storage and delivery of a cryogenic mixed gas is disclosed, the storage apparatus including a compact and lightweight dewar for containing cryogenic temperature mixed gas at supercritical pressure. Different heat exchangers associated with the dewar provide for heat input to

A system and method for storage and delivery of a cryogenic mixed gas is disclosed, the storage apparatus including a compact and lightweight dewar for containing cryogenic temperature mixed gas at supercritical pressure. Different heat exchangers associated with the dewar provide for heat input to the dewar to maintain gas therein in a single phase and provide continued expulsion energy. A backpack receives the dewar and includes means for quick connect of the dewar with an end use outlet, intermediate heat exchangers in the backpack conditioning the mixed gas for end use. No electrical input for fluid circulation is required. ocating movement along a stroke path between top dead center and bottom dead center during operation of said engine; said cylinder and said piston conjointly delimiting a combustion chamber; a crankcase connected to said cylinder; a crankshaft rotatably mounted in said crankcase; a connecting rod connecting said piston to said crankshaft to permit said piston to drive said crankshaft as said piston reciprocates in said cylinder; an outlet for conducting exhaust gases away from said combustion chamber; a transfer channel connecting said crankcase to said combustion chamber; said transfer channel having a first end defining a transfer window lying in said cylinder wall and opening into said combustion chamber; said transfer channel having a second end defining an inflow opening; a mixture-preparation unit for supplying an air/fuel mixture; an inlet in said crankcase downstream of said mixture-preparation unit for conducting said air/fuel mixture into said crankcase; an air channel for supplying an essentially fuel-free gas flow to said crankcase; a storage space in said crankcase; said air channel communicating with said crankcase through said storage space; and, a valve mounted in said crankcase so as to be movable between a first position wherein said inflow opening of said transfer channel is connected directly to said crankcase and a second position wherein said inflow opening is connected indirectly to said crankcase via said storage space; the method comprising the steps of: storing air in said transfer channel toward the end of a scavenging cycle; and, at the start of the next scavenging cycle, pushing the stored air as advance air into said combustion chamber with a fresh mixture flowing out from said crankcase. 3. The method of claim 2, wherein said advance air flows into said storage space during the induction phase of said two-stroke engine with the flow of said advance air being in the flow direction toward said crankcase; and, said advance air is displaced out of said storage space and into said transfer channel at the end of said scavenging cycle. 4. A two-stroke engine including an engine in a portable handheld work apparatus, the two-stroke engine comprising: a cylinder having a cylinder wall; a piston mounted in said cylinder to undergo a reciprocating movement along a stroke path between top dead center and bottom dead center during operation of said engine; said cylinder and said piston conjointly delimiting a combustion chamber; a crankcase connected to said cylinder; a crankshaft rotatably mounted in said crankcase; a connecting rod connecting said piston to said crankshaft to permit said piston to drive said crankshaft as said piston reciprocates in said cylinder; an outlet for conducting exhaust gases away from said combustion chamber; a transfer channel connecting said crankcase to said combustion chamber; said transfer channel having a first end defining a transfer window lying in said cylinder wall and opening into said combustion chamber; said transfer channel having a second end defining an inflow opening; a mixture-preparation unit for supplying an air/fuel mixture; an inlet in said crankcase downstream of said mixture-preparation unit for conducting said air/fuel mixture into said crankcase; an air channel for supplying an essentially fuel-free gas flow to said crankcase; a storage space in said crankcase; said air channel communicating with said crankcase through said storage space; and, a valve mounted in said crankcase so as to be movable between a first position wherein said inflow opening of said transfer channel is connected directly to said crankcase and a second position wherein said inflow opening is connected indirectly to said crankcase via said storage space. 5. The two-stroke engine of claim 1, further comprising a membrane valve for connecting said air channel to said storage space. 6. The two-stroke engine of claim 1, wherein said valve is a valve controlled