36results about "Heater tubes" patented technology

A Stirling cycle machine. The machine includes at least one rocking drive mechanism which includes: a rocking beam having a rocker pivot, at least one cylinder and at least one piston. The piston is housed within a respective cylinder and is capable of substantially linearly reciprocating within the respective cylinder. Also, the drive mechanism includes at least one coupling assembly having a proximal end and a distal end. The linear motion of the piston is converted to rotary motion of the rocking beam. Also, a crankcase housing the rocking beam and housing a first portion of the coupling assembly is included. The machine also includes a working space housing the at least one cylinder, the at least one piston and a second portion of the coupling assembly. An airlock is included between the workspace and the crankcase and a seal is included for sealing the workspace from the airlock and crankcase. A burner and burner control system is also included for heating the machine and controlling ignition and combustion in the burner.

An external combustion engine having an exhaust flow diverter for directing the flow of an exhaust gas. The external combustion engine has a heater head having a plurality of heater tubes through which a working fluid is heated by conduction. The exhaust flow diverter is a cylinder disposed around the outside of the plurality of heater tubes and includes a plurality of openings through which the flow of exhaust gas may pas. The exhaust flow diverter directs the exhaust gas past the plurality of heater tubes. The external combustion engine may also include a plurality of flow diverter fins coupled to the plurality of heater tubes to direct the flow of the exhaust gas. The heater tubes may be U-shaped or helical coiled shaped.

A device and method for controlling the flow of a gaseous fuel from a fuel supply to a pressurized combustion chamber. A fuel pump is included in the gas train from supply to chamber. The fuel pump increases the pressure of the gas to allow efficient injection into the chamber. The pump is modulated to control the fuel flow. Both alternating current and pulse-width-modulated direct current signals may be used to control the flow. The pump may be a piston pump or a diaphragm pump. Feedback may be provided from sensors that determine operating parameters of the engine and such sensor signals may be used by the controller to maintain a parameter, such as temperature, at a specified value. An acoustic filter can be included in the gas train to significantly reduce gas flow pulsations generated by the pump. This filter improves the uniformity of the combustion process.

A burner for an external combustion engine using liquid or gaseous fuel, the burner being arranged for heat exchange between the inlet air to the burner and the exhaust air from the burner. The burner includes an external housing, a shroud within this housing, which shroud forms part of the centrally positioned combustion chamber. The burner includes air inlet apparatus and guide apparatus for guiding the inlet air to the combustion chamber, an igniter and fuel inlet apparatus and gas exhaust apparatus. The external housing, an element of the inlet apparatus, the guide apparatus, and heat exchange elements are formed as inverted shaped dishes or shells about the combustion chamber.

The invention provides an apparatus for generating heat and transferring the heat to a heater head of an external combustion engine, preferably, a Stirling engine. Fuel and air are introduced into a combustion chamber and mixed to form an air / fuel mixture. The air / fuel mixture is combusted over a combustion catalyst positioned in physical contact with a heat spreader, which itself is positioned in physical contact with a heat acceptor surface. The heat acceptor surface is secured in thermal communication with the heater head. Depending upon the design of the heater head, heat flux from the heat acceptor surface into the heater head may occur radially or non-radially.

A Stirling cycle machine. The machine includes at least one rocking drive mechanism which includes: a rocking beam having a rocker pivot, at least one cylinder and at least one piston. The piston is housed within a respective cylinder and is capable of substantially linearly reciprocating within the respective cylinder. Also, the drive mechanism includes at least one coupling assembly having a proximal end and a distal end. The linear motion of the piston is converted to rotary motion of the rocking beam. Also, a crankcase housing the rocking beam and housing a first portion of the coupling assembly is included. The machine also includes a working space housing the at least one cylinder, the at least one piston and a second portion of the coupling assembly. An airlock is included between the workspace and the crankcase and a seal is included for sealing the workspace from the airlock and crankcase. A burner and burner control system is also included for heating the machine and controlling ignition and combustion in the burner.

A device and method for controlling the flow of a gaseous fuel from a fuel supply to a pressurized combustion chamber. A fuel pump is included in the gas train from supply to chamber. The fuel pump increases the pressure of the gas to allow efficient injection into the chamber. The pump is modulated to control the fuel flow. Both alternating current and pulse-width-modulated direct current signals may be used to control the flow. The pump may be a piston pump or a diaphragm pump. Feedback may be provided from sensors that determine operating parameters of the engine and such sensor signals may be used by the controller to maintain a parameter, such as temperature, at a specified value. An acoustic filter can be included in the gas train to significantly reduce gas flow pulsations generated by the pump. This filter improves the uniformity of the combustion process.

An external combustion engine having an exhaust flow diverter for directing the flow of an exhaust gas. The external combustion engine has a heater head having a plurality of heater tubes through which a working fluid is heated by conduction. The exhaust flow diverter is a cylinder disposed around the outside of the plurality of heater tubes and includes a plurality of openings through which the flow of exhaust gas may pas. The exhaust flow diverter directs the exhaust gas past the plurality of heater tubes. The external combustion engine may also include a plurality of flow diverter fins coupled to the plurality of heater tubes to direct the flow of the exhaust gas. The heater tubes may be U-shaped or helical coiled shaped.

An external combustion engine having an exhaust flow diverter for directing the flow of an exhaust gas. The external combustion engine has a heater head having a plurality of heater tubes through which a working fluid is heated by conduction. The exhaust flow diverter is a cylinder disposed around the outside of the plurality of heater tubes and includes a plurality of openings through which the flow of exhaust gas may pas. The exhaust flow diverter directs the exhaust gas past the plurality of heater tubes. The external combustion engine may also include a plurality of flow diverter fins coupled to the plurality of heater tubes to direct the flow of the exhaust gas. The heater tubes may be U-shaped or helical coiled shaped.

A thermodynamic machine includes at least one chamber in which an isothermal expansion and / or compression is to be carried out, said chamber being longitudinally defined by first and second walls that are mobile relative to each other. The chamber is divided by partitions extending longitudinally from each of the first and second walls, the partitions being interleaved within each other, and the distance between the partitions extending from a same wall being such that the ratio between the distance squared and the cycle duration of the thermodynamic machine is lower than the average thermal diffusivity of the gas contained in the chamber.

Heat exchanger fins and a method for fabricating fins particularly suitable for the head of Stirling engine. The fins have a frusto-conical contour and surround and are brazed to the heater head at axially spaced positions. The inner edges of the fins are rolled to provide a flange for engaging and being joined to the head and have axially aligned, radial slots cut into the outer edge to provide channels for the passage of the products of heater combustion. The fins can be formed of annular rings or from a ribbon bent into a helix.

The invention discloses a gas axial transmission alpha type four-cylinder double-acting stirling engine which comprises a combustion device; a heating device is arranged indie the combustion device; an air cylinder top of a working medium circulating device is connected with the heating device; an air cylinder at one end of the working medium circulating device is connected with the corresponding cooling device; the heating device and the cooling devices are connected through heat regenerators to form a closed working medium circulating loop; a transmission device is connected with a piston rod of the working medium circulating device through a connecting rod; the transmission device and the combustion device are connected by a split casing to form a whole; by taking ammonia or helium as a working medium and adopting a positive sterling cycle, the working medium absorbs heat from the combustion device, stores energy through the heat regenerators and discharges heat to the cooling devices, thereby forming a complete working medium circulating loop; and a transmission mechanism outputs shaft work to the outside. The gas axial transmission alpha type four-cylinder double-acting stirling engine disclosed by the invention has the advantages of cleanness, high efficiency and low noise; and in addition, the service life of a sealing element of the engine can be longer.

The invention provides an apparatus for generating heat and transferring the heat to a heater head of an external combustion engine, preferably, a Stirling engine. Fuel and air are introduced into a combustion chamber and mixed to form an air / fuel mixture. The air / fuel mixture is combusted over a combustion catalyst positioned in physical contact with a heat spreader, which itself is positioned in physical contact with a heat acceptor surface. The heat acceptor surface is secured in thermal communication with the heater head. Depending upon the design of the heater head, heat flux from the heat acceptor surface into the heater head may occur radially or non-radially.

A Stirling engine with internal regenerator and integral geometry for heat transfer and fluid flow has a displacer piston with a plurality of cavities traversing through the displacer piston and arranged in a specific cross sectional geometry. A heater head has heater fin protrusions that are arranged in the specific geometry, and a cooling bridge has cooler fin protrusions that are in the specific geometry. The displacer piston alternates between the heater head and the cooling bridge, with the cavities of the piston alternately enveloping the heater protrusions and the cooling protrusions, providing more efficient heat transfer to and from the working fluid. Each cavity in the displacer also contains a regenerator core, further improving heat transfer efficiency. The heater fin protrusions may also contain thermally conductive cores. A bellows assembly may also be used to seal the displacer piston from the heater head in order to reduce unswept volume.

A system for electricity generation using heat contained in exhaust gas from a combustor (enclosed flare) to drive an external combustion Stirling cycle engine which directly drives at least one alternator or generator. A battery is connected to the alternator or generator through a divider circuit followed by a filter circuit. Electric power distribution circuits are electrically connected to output circuits of the alternators or generators for consumption of the electric power on-site, for sale to a commercial electric power distribution grid, or for any other desired uses.

A heat exchanger assembly for transferring heat across a wall of a housing is disclosed. The assembly comprises an outer heat exchanger having an outer ring disposed outside the housing and having an interior surface in contact with an exterior surface of the wall; an inner support disposed inside the housing and having an exterior surface; and a plurality of inner heat fins connecting the exterior surface of the inner support to an interior surface of the wall of the housing.

A radiation thermal absorber based on characteristic absorption spectrum, a Stirling engine and an operation method thereof. The radiation thermal absorber allows working gas in the Stirling engine to absorb radiation heat quickly, and help the Stirling engine adopt assistant heating to ensure steady operation when solar power is not enough. The radiation thermal absorber includes a heater base, a radiation energy conversion device, heating tubes, a combustion chamber and valves of the heating tubes. The radiation energy conversion device converts the solar energy into radiation energy near a characteristic absorption peak of the working gas, and the working gas absorbs the radiation directly in depth.

A Stirling engine with internal regenerator and integral geometry for heat transfer and fluid flow has a displacer piston with a plurality of cavities traversing through the displacer piston and arranged in a specific cross sectional geometry. A heater head has heater fin protrusions that are arranged in the specific geometry, and a cooling bridge has cooler fin protrusions that are in the specific geometry. The displacer piston alternates between the heater head and the cooling bridge, with the cavities of the piston alternately enveloping the heater protrusions and the cooling protrusions, providing more efficient heat transfer to and from the working fluid. Each cavity in the displacer also contains a regenerator core, further improving heat transfer efficiency. The heater fin protrusions may also contain thermally conductive cores. A bellows assembly may also be used to seal the displacer piston from the heater head in order to reduce unswept volume.

The invention relates to the technical field of engines, in particular to a free piston Stirling engine. The free piston Stirling engine comprises two Stirling mechanisms which are oppositely arranged, a heat source is arranged between the two Stirling mechanisms; each Stirling mechanism comprises a shell and a heat pipe type heater; a communicating pipeline is connected between the two Stirling mechanisms; the communicating pipeline communicates with two expansion cavities or two compression cavities or two back cavities, the heat pipe type heater comprises a heater body and a plurality of heat pipes, the condensation ends of the heat pipes are correspondingly arranged in heat pipe embedding holes, and the evaporation ends of the heat pipes penetrate through the shell to be connected withthe heat source. The free piston Stirling engine is compact in structure, vibration of the engine is reduced, each Stirling mechanism adopts a heat pipe type heater to achieve heat transmission, heatloss in energy transmission is effectively reduced, and the working efficiency of the engine is improved.

Coil solar receiver for a Stirling disk, the main components of which are pipes (where the sun hits), collectors, tanks and cupolas (of which there are two types, one that houses the regenerator, and the expansion cupola that is the area where the working gas is at a higher temperature) that includes a series of pipes (1) that perpendicularly exit from one collector (2) and perpendicularly enter another (2) and where each pipe consists of two semicircumferential curved parts (10) and three straight parts (11) parallel to one another: a center straight part (between curve and curve) and two straight parts on the ends (between the curve and the exit of one collector (2)), the two straight end parts being located on the same plane, while the center straight part is located in a separate plane.

The invention relates to a defrosting unit of a Stirling motor and the Stirling motor. The defrosting unit is used for being fixed to the cold end of the Stirling motor and comprises a heat exchange assembly, a heating assembly and a fixing structure, and the heat exchange assembly is fixed to the cold end through the fixing structure. The heating assembly heats the heat exchange assembly during work and comprises a heating pipe. An embedding groove is formed in the side, close to the fixing structure, of the heat exchange assembly, the shape of the embedding groove is matched with that of the heating pipe, and the heating pipe is embedded into the embedding groove. The defrosting unit is in contact with the heating assembly through the heat exchange assembly, the heating assembly cannot be directly exposed to air, the heating assembly is heated, and the heat exchange assembly is in contact with the cold end directly. Due to the fact that the heat exchange efficiency of a gas medium is larger than that of a solid medium, the heating pipe is embedded into the heat exchange assembly, heat is preferentially conducted to the cold end and cannot spread to the air easily under the action of the heat balance theory, and the work efficiency of the Stirling motor is guaranteed.

An aspect of the present disclosure is directed to a system for energy conversion. The system includes a closed cycle engine containing a volume of working fluid. The engine includes an expansion chamber and a compression chamber each separated by a piston attached to a connection member of a piston assembly. The engine further includes a plurality of heater conduits extended from the expansion chamber. The engine includes a plurality of chiller conduits extended from the compression chamber. The expansion chamber and heater conduits are fluidly connected to the compression chamber and chiller conduits via a walled conduit.

The invention discloses an adaptive device and method suitable for overtemperature of Stirling engine heating tubes, including a plurality of memory alloys, each of which is arranged on the inner wall of the heating tube; when the temperature in the heating tube is lower than that of the memory alloy When the temperature threshold is reached, each memory alloy is attached to the inner wall of the heating pipe; when the temperature in the heating pipe exceeds the temperature threshold of the memory alloy, each memory alloy is bent along the radial direction of the heating pipe. When the shape of the memory alloy changes and bends, when the gas working medium with the same mass flow rate flows through, the bent memory alloy enhances the disturbance of the air flow, improves the convective heat transfer coefficient, and strengthens the convective exchange between the gas working medium and the heating tube. Heat, in order to achieve the purpose of reducing the temperature of the heating tube. The invention enhances heat exchange without causing waste of energy, without suspending the operation of the power generation device, so that the operation is more stable, and at the same time of cooling the heating tube, it can not only effectively use solar energy, but also not interrupt the power generation, so as to ensure stable power output .

The invention discloses a self-adaption device and method applied to Stirling engine heating pipe overtemperature. The self-adaption device and the method applied to Stirling engine heating pipe overtemperature comprises a plurality of memory alloys; each memory alloy is arranged on the inner wall of a heating pipe; when the temperature in the heating pipe is lower than the temperature threshold of the memory alloys, each memory alloy is attached to the inner wall of the heating pipe; when the temperature in the heating pipe exceeds the temperature threshold of the memory alloys, each memory alloy is bent in the radial direction of the heating pipe; and when the shapes of the memory alloys change and bend and when a gas working medium with the same mass flow rate flows, the bent memory alloys enhance disturbance of airflow, the convective heat transfer coefficient is improved, convection heat exchange between the gas working medium and the heating pipe is enhanced, and the purpose of reducing the temperature of the heating pipe is achieved. The self-adaption device and method applied to Stirling engine heating pipe overtemperature adopt enhanced heat exchange, the waste of energy is avoided, the operation of a generation set is not paused, the operation is more stable, the cooling of the heating pipe is realized, meanwhile, the solar energy can be effectively utilized, the power generation can also not be interrupted, and the stability of power output is guaranteed.

The invention discloses an adjusting device and method applied to Stirling engine heating pipe overtemperature. The adjusting device applied to the Stirling engine heating pipe overtemperature comprises a pipeline and a heat collection cavity; the pipeline is arranged on the inner wall of the heat collection cavity; and the pipeline communicates with a cooling water source. When the pipe wall temperature of a heating pipe exceeds a preset threshold, a controller controls to open a solenoid valve used for controlling water on-off in the pipeline to make water in the pipeline flow, the inner wall temperature of the heat collection cavity drops rapidly, radiation heat exchange amount of the inner wall of the heat collection cavity and the heating pipe is increased due to the inner wall temperature drop of the heat collection cavity, and then the temperature of the heating pipe is reduced. Light spots do not need to be cut and operation of a power generation device does not need to be paused, when the pipe wall temperature of the heating pipe is overtemperature, the operation is even more stable, electricity generation can not be broken off, and the stability of power output is guaranteed.

A tubular reactor which acts as a combustor and heat exchanger is disclosed. Such reactor supplants a system with a combustor having a heat exchanger arranged around the combustor. The combined system includes a diffuser having an inlet for a fuel-and-air mixture and a plurality of holes defined in its surface through which the fuel-and-air mixture exits the diffuser and a plurality of tubes. First linear portions along the length of each tube are mutually parallel with a centerline of the first portions of the tubes displaced from the diffuser by a predetermined distance. Centerlines of the linear portions of adjacent tubes are displaced from each other by a predetermined gap. The fuel and air combust in the proximity of the first portion of the tubes for effective heat transfer to gases traveling through the tubes. Such a tubular reactor can be employed within a thermal-compression heat pump.

A system for electricity generation using heat contained in exhaust gas from a combustor (enclosed flare) to drive an external combustion Stirling cycle engine which directly drives at least one alternator or generator. A battery is connected to the alternator or generator through a divider circuit followed by a filter circuit. Electric power distribution circuits are electrically connected to output circuits of the alternators or generators for consumption of the electric power on-site, for sale to a commercial electric power distribution grid, or for any other desired uses.