Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
  • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
  • F25B9/004—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being air
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
  • F02G1/00—Hot gas positive-displacement engine plants
  • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
  • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
  • F01C1/00—Rotary-piston machines or engines
  • F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
  • F01C1/10—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
  • F01C1/103—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
  • F01C11/00—Combinations of two or more machines or engines, each being of rotary-piston or oscillating-piston type
  • F01C11/002—Combinations of two or more machines or engines, each being of rotary-piston or oscillating-piston type of similar working principle
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
  • F02G1/00—Hot gas positive-displacement engine plants
  • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
  • F02G1/00—Hot gas positive-displacement engine plants
  • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
  • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
  • F02G1/053—Component parts or details
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
  • F02G2270/00—Constructional features
  • F02G2270/10—Rotary pistons

Definitions

• the present invention relates to a bray ton-rankine- Stirling engine employing two- stage compression and two-stage expansion, and more particularly, to a brayton- rankine- Stirling engine employing two-stage compression and two-stage expansion, which realizes the high pressure compression by disposing a lip seal (sleeve) at the center rotor to secure the sealing between the high stage and the low stage and prevent the center rotor from being swayed after machining the specially machined trocoid gear to be two stage so as to improve the thermal efficiency of the conventional turbine type brayton cycle engine, constructed as the two-stage compressor differently from the expansion turbine or the conventional turbine and improves the thermal efficiency according to the fuel by making it to be expanded at two-stage, can increase the pressure to 6 bar by the primary stage compression and to not less than 11 bar by the secondary stage compression, can improve the thermal efficiency beyond comparison with the conventional cycle by enlarging the expansion force to improve the capacity because it is secondarily expanded at the outside again after it is primarily expanded, when the air is
• the present invention has been made to solve the above-mentioned problems occurring in the conventional engine, and it is a primary object of the present invention to provide a brayton-rankine-stirling engine employing two-stage compression and two-stage expansion, which can carry out the two-stage compression easily and is suitable for the compression of the high pressure gas because a compressor is made of gear type, and an expander is made of gear type two-stage expander, so that it expands at two-stages to thereby improve the expansion efficiency, resulting in good thermal efficiency and it is suitable for the high speed rotation.
• Another object of the present invention is to provide a brayton-rankine-stirling engine employing two-stage compression and two-stage expansion, which can increase the gas pressure by using the low temperature (about 100 0 C) heating to thereby rotate the expansion turbine, and then produces big output and liquefies the gas to thereby transport and recycle the gas and the liquefied gas to a high temperature portion by using the two-stage compressor, because the rankine cycle utilizes the change of gas state.
• Still another object of the present invention is to provide a brayton-rankine-stirling engine employing two-stage compression and two-stage expansion, which can be used as an air cooler because the temperature of the air can be rapidly reduced by the two- stage expansion after compressing the air with high pressure by the two-stage compression and two-stage expansion to thereby remove the compression heat to the outside, as the engine can be used as an sterling engine using the expansion of the gas due to heating of the high pressure gas and the contraction of the high pressure gas due to the cooling, without the use of the change of the high pressure gas state.
• FIG. 1 is a diagram showing the structure of an air refrigeration system and a brayton-rankine-stirling engine employing two-stage compression and two-stage expansion according to an embodiment of the present invention
• FIG. 2 is a view showing the inside of a second gear constituting the two-stage compression and two-stage expansion according to an embodiment of the present invention
• FIG. 3 is a cross-sectional view of a gear constituting the two-stage compression and two-stage expansion according to an embodiment of the present invention
• FIG. 4 is a view showing an emitting opening of an inside suction opening of a two- stage compressor according to an embodiment of the present invention
• FIG. 5 is a view showing an inside inlet and outlet of a two-stage expander according to an embodiment of the present invention
• FIG. 6 is a view showing an inside cover of a compressor according to an embodiment of the present invention.
• FIG. 7 is a view showing an outer cover of the compressor according to an embodiment of the present invention.
• FIG. 8 is a view showing an inside cover of an expander according to an embodiment of the present invention.
• FIG. 9 is a view showing an outer cover of the expander according to an embodiment of the present invention.
• bray ton-rankine- Stirling engine using two-stage compression and two-stage expansion there is provided bray ton-rankine- Stirling engine using two-stage compression and two-stage expansion
• the engine comprises a two-stage compressor and a two-stage expander
• the compressor is constructed such that an additional trocoid gear is disposed at the inside of a trocoid gear to define two stage structure, the primary stage compression is performed at the outside of the compressor and the secondary stage compression is performed at the inside of the compressor, and a lip seal is disposed between the trocoid gears to secure air-tight sealing of the high pressure stage and the low pressure stage and stable rotation, to thereby increase the thermal efficiency
• the expander is constructed to have the same structure as that of the compressor, the primary stage of the expander becomes the secondary stage of the inside gear, that is, the compressor, and the secondary stage of the expander becomes the primary stage of the compressor.
• the compressor is constructed of a round outside gear with nine teeth, a moving gear with eight outside teeth and eight inside teeth, and a center gear with seven teeth and a center axis at the center thereof to perform two-stage compression
• the inside tooth number of the moving gear is identical with that of the outside
• the lip seal (sleeve) is disposed at a round groove formed at the mid of the moving gear and at a round groove formed at an outer cover to prevent the leakage of the pressure between the primary stage and the secondary stage and secure stable rotation of the moving gear without any sway
• the primary stage compression is performed by sucking the gas through a primary stage suction opening of the compressor of the outside gear and emitting it through a primary stage emitting opening of the compressor
• secondary stage compression is performed by sucking the gas through a secondary stage suction opening of the compressor and emitting it through a secondary stage emitting opening of the compressor.
• the expander is constructed by fixing a two-stage expander having a structure identical with that of the compressor to a connection plate by means of a connection pin after securing a round connection plate at the rear side of the compressor by the connection pin, and is operated to suck the gas through the primary stage inlet and discharge through the primary stage outlet, and then the gas is sucked through the secondary stage inlet and is discharged through a secondary stage outlet, to thereby generate the rotation force according to the expansion force.
• the cycle comprises a heat exchanger (cooler) and a heater
• solenoid valves discharge solenoid valve 11 of the outside air, solenoid valve 12, inflow solenoid valve 13 of the outside air, solenoid valve 14, solenoid valve 15, and solenoid valve 34 for discharging the air of the air refrigeration
• solenoid valves discharge solenoid valve 11 of the outside air, solenoid valve 12, inflow solenoid valve 13 of the outside air, solenoid valve 14, solenoid valve 15, and solenoid valve 34 for discharging the air of the air refrigeration
• solenoid valve 34 for discharging the air of the air refrigeration
• solenoid valve 34 for discharging the air of the air refrigeration
• the engine can be used as an air refrigerant refrigeration system by constructing the heat exchanger with the solenoid valve to thereby compress the outside air at the secondary stage, and remove the compression heat by the outside air in the heat exchanger, and expand the air by two-stage to reduce the temperature of the air rapidly.
• the gear type as shown in FIGs. 2 and 3, it is constructed of a trocoid type, such that a trocoid gear is disposed again within the gear, so that primary compression is carried out at the outside and the secondary compression is carried out at the inside, and a lip seal 4 is disposed at the mid of the primary stage and the secondary stage for sealing a low stage and a high stage so as to keep sealing and hold the mid gear and prevent them from swaying at the time of the rotation to thereby improve the compression capacity.
• the lip seal 4 is disposed at a round groove formed at the outer cover and the mid gear as a sleeve, so that the mid gear is connected to the outer cover by means of it.
• a connection plate 17 is secured to the opposite side by means of a connection pin 16, and an expander is mounted at the opposite side, so that the compressor can rotate with identical numbers of rotation if the expander rotates, when the compressor and the expander are connected by the connection plate 17.
• the air of 1 bar pressure is sucked through the suction opening 20 and is discharged through the emitting opening 21 at about a pressure of 6 bar, and the air of 6 bar pressure is again sucked through the secondary stage suction opening 22 and is discharged through the secondary stage emitting opening 23 with the pressure of 11 bar.
• the lip seal 4 is operated to prevent the leakage of the pressure between the primary stage and the secondary stage, and also prevent the mid gear from being swayed to thereby secure the stable rotation and prevent the leakage of the pressure.
• the air having a pressure of 11 bar passing through the secondary stage emitting opening 23 passes through the solenoid valve 14 and a heat exchanger 7, and enters into a heating combustion device 8, in which it is heated to 1500 0 C to thereby expand the volume of the air, and enters into an inlet 24 of the primary stage expander from an inlet of the second stage expander 10 and is discharged through an outlet 25 of the primary expander to thereby be expanded at high speed to rotate the gear.
• the air enters into an inlet 26 of the secondary stage expander and is discharged through an outlet 27 of the secondary stage expander to still more increase the rotation force.
• the action of the lip seal 4 is important to prevent the high pressure of the primary stage expander from being leaked into the secondary stage expander and to prevent the mid gear from being swayed.
• the lip seal 4 is disposed at the round grooves formed at the center of the mid gear and the outer cover as a sleeve shape, so that the mid gear can rotate at the state of connection with the outer cover.
• the hot gas discharged from the outlet 27 of the secondary stage expander passes through the heat exchanger 7 to perform the heat exchange with the air emitted from the emitting opening 23 of the secondary stage compressor to thereby increase the temperature of the air entering into the heater (combustor).
• the engine of the present invention When the engine of the present invention is operated as a rankine cycle engine, which provides higher capacity than the conventional type, it is operated as follows. In this case, high pressure liquefied gas is sealed at the inside of the system, the solenoid valves 11, 13, 14 are intercepted, and the solenoid valves 12, 15 are opened.
• the compressor 9 is operated to supply heat to the heater (combustor) 8 to heat the high pressure gas to 100 0 C, so that the pressure of the gas is increased to 60 bar (in case of NH ) to enter into the inlet 24 of the expander 10 and discharged through the outlet 25 of the primary stage expander, and then, the gas enters into the inlet 26 of the secondary stage expander and discharged through the outlet 27 of the secondary stage expander to thereby rotate the expander at high speed.
• the lip seal 4 is operated to keep the sealing state of the primary stage and secondary stage expanders and hold the mid gear stably.
• the compressor 9 is used as a two-stage pump, which is a trocoid type geared compressor (pump) with a structure of compressing and pumping the liquid and the gas, so that it can be used irrespective of the liquid and the gas. Also, it is good in durability because it is not necessary to discriminate the liquid from the gas when the gas enters into the expander.
• the engine of the present invention can be used as a rankine cycle engine, which can produce high thermal efficiency from low heat source by using the high pressure liquefied gas.
• the heater is heated concurrently with the start of the start motor 33 to thereby increase the pressure of the gas. Then, the gas passes through the inlet 24 of the expander 10, the outlet 25 of the primary stage expander, the inlet 26 of the secondary expander 26, and the outlet 27 of the secondary expander to thereby rotate the gear of the expander at secondary stage, and then enters into the heat exchanger (cooler) 7 to perform heat exchange with the outside air to thereby decrease the pressure of the gas.
• the gas passes through the solenoid valve 12, the suction opening 20 of the compressor 9, the emitting opening 21 of the primary stage compressor (pump), the suction opening 22 of the secondary stage compressor (pump), the emitting opening 23 of the secondary stage compressor (pump), the solenoid valve 15 again, and it enters into the heater (combustor) 8 to increase the gas pressure due to the heating, to thereby produce dynamic power in the expander.
• the solenoid valve 12 the suction opening 20 of the compressor 9
• the emitting opening 23 of the secondary stage compressor (pump) the solenoid valve 15 again, and it enters into the heater (combustor) 8 to increase the gas pressure due to the heating, to thereby produce dynamic power in the expander.
• the vibration is removed, and high speed rotation (10,000 rpm) can be achieved, and it is impossible to compare with the conventional expander.
• the compressor can realize compression of higher capacity than the screw compressor, and can improve the capacity with two-stage compression and two-stage expansion and concurrently realize the rankine cycle engine, in which the compressor is especially employed as a pump for the liquefied gas.
• the engine as described above can be used as an air refrigerant refrigerating system.
• the geared compressor rotor is constructed of an outer gear 2, a mid gear 3, and a center gear 5 having a center axis 6, which is disposed at the inside of the mid gear 3, and the rotor is connected to a mid rotor by means of a lip seal (sleeve) disposed at round grooves formed at the mid of the mid gear and the outer cover to thereby keep sealing and prevent the rotor from being swayed.
• connection plate 17 is mounted at the opposite side by means of the connection pin 16, and the expander is secured to the connection plate 17 at the opposite side by means of the connection pin 16 as is the compressor, so that the expander rotates at identical turns together with the rotation of the compressor.
• the outer cover 1 is mounted to the outer side, and a bearing 19 is mounted to the cover, and the lip seal 4 is disposed at a joint portion with the gear at the inside of the cover to connect the cover to the mid gear as a sleeve.
• both covers are formed with four through-holes of the same shape, each of which will be used as an inlet and an outlet, a start motor is mounted at one side of the center axis 6, and a load, that is, a necessary device is mounted to the other side of the center axis.
• the compressor and the expander are mounted at both sides of a round plate to remove mechanical friction resistance.
• the gear type used in the engine of the present invention is a trocoid type, which is a geared pump widely used as a lubrication pump and is constructed of an inside gear and an outside gear rotating concurrently.
• the present invention employs a special structure that the outside of the inner gear and the inside of the outer gear constitute a moving gear 3 because a pair of gear is disposed at the inside of the inner gear.
• the rotation number is high (5,000 ⁇ 10,000 rpm), and the inside gear rotates together with the outside gear.
• the tooth number of the outer gear is nine
• the tooth number at the outside of the moving gear is nine
• the tooth number at the inside of the moving gear is eight
• the tooth number of the center gear is seven, so that there was a difference of one gear between the outside of the outer gear and the center gear, resulting in the formation of a primary stage compression pocket 31 and a secondary stage compression pocket 32.
• the compression is achieved by the difference of the tooth, which is one
• the sealing between the high stage and the low stage and the stable rotation of the moving gear 3 are achieved by the lip seal 4 (sleeve), and the lip seal is disposed in the groove formed at the outer cover as is the moving gear.
• the present invention has been described with reference to the compressor, which can be used for the two-stage pump, if the system is used differently.
• the structure of the expander is identical with that of the compressor, however, there is a difference that one is operated in primary stage and the other is operated in secondary stage.
• the outside is the low stage (primary stage) and the inside is the high stage (secondary stage).
• the inside is the low stage (primary stage), and the outside is the high stage (secondary stage) contrarily.
• the fluid is primarily expanded at the inside and again expanded secondarily at the outside and discharged, which is contrary to the compressor, to thereby increase the expansion efficiency.
• the heater (combustor) 8 combusts the high pressure fuel, which is pressurized by the high pressure pump, injected through the nozzle with the compressed air, so that separate supply of the oxygen is not required and the gas can be heated to about 1500 0 C.
• the compressed air passes through the solenoid valve 14 and enters into the heat exchanger (cooler) 7 and at the inside thereof performs the heat exchange with the hot air passed through the expander, and enters into the heater (combustor) 8, in which the fuel pressurized at high pressure is ignited with the fuel passed through the nozzle to be combusted and heated to 1500 0 C, then the air enters into the primary stage inlet 24 of the expander after expanding the volume of the air and it is expanded with high pressure, then the air is discharged through the primary stage outlet 25 of the expander, and then the air enters into the secondary stage inlet 26 of the expander and is discharged through the secondary stage outlet 27 of the expander.
• the discharge air enters into the heat exchanger (cooler) 7 and performs the heat exchange with the air emitted from the compressor and is discharged to the outside.
• the volume of the air is expanded by compressing the air and heating it to a high temperature, and it rotates the geared rotor at high speed with passing through the expander.
• the thermal efficiency of the present invention is 75%, which is very high, in contrast to the conventional method of very low thermal efficiency, in which 2/3 of the generated power is used to operate the compressor and only 1/3 of the generated power can be utilized. Accordingly, still higher thermal efficiency can be achieved when the engine is used as a rankine cycle.
• the engine of the present invention is used as a rankine cycle engine, at first, the inside of the device is sealed by high pressure liquefied gas and the solenoid valves 11, 13, which are opened to the outside, are intercepted, and the compressor is operated by using the start motor 33. Then, the condensed and liquefied gas in the heat exchanger and the gas are sucked into the suction opening 20 of the compressor (pump) through the solenoid valve 12 and are emitted through the emitting opening 21 of the primary stage compressor (pump), and they are sucked through the secondary stage suction opening 22 and are emitted through the secondary stage emitting opening 23, and then pass through the solenoid valve 15 and enter into the heater (combustor).
• the heater (combustor) is heated from the outside, the liquefied gas is heated to about 100?.
• the ammonia (NH ) having a pressure of about 60 bar enters into the primary stage inlet 24 of the expander 10 at high pressure and is expanded, then it is discharged through the primary stage outlet 25, then it enters into the secondary stage inlet 26 of the expander again and is expanded, and then it is discharged through the secondary stage outlet 27 of the expander.
• the engine is operated with the pressure differential, which is produced between the heating and the cooling, of about 50 bar and the compressor 9 is constructed that it acts as a pump and performs the compression and pumping of the gas and the liquid.
• the solenoid valves 11, 13, 14 are intercepted.
• a gas easy to condense with the outside air according to the conditions of the temperature of the outside air is selected.
• the system uses the change of the gas state and generates big force from a small amount of heat.
• the Stirling engine operates the device by using the expansion owing to the heating of the high pressure gas and the contraction caused by the cooling without the change of the gas state.
• the Stirling engine is operated as follows. If the start motor 33 is operated with heating the heater (combustor) 8 and cooling the heat exchanger (cooler) 7 with the outside air after sealing the inside of the device with high pressure gas, the high pressure gas heated in the heater enters into the inlet 24 of the expander 10 by the increase of the pressure and is discharged through the primary stage outlet 25 of the expander, and passes through the secondary stage inlet 26 and is expanded and discharged through the outlet 27 to thereby rotate the geared rotor.
• the device can be used as an air refrigerant refrigerating system.
• the air refrigeration progresses as follows.
• the high speed start motor 33 is operated to drive the secondary stage compressor at high speed
• the outside air is sucked through the primary stage suction opening 20 of the compressor 9 via the solenoid valve 13, compressed primarily and emitted through the primary stage emitting opening 21 with the pressure of 6 bar.
• the secondary stage compression suction opening 22 compressed and emitted through the secondary stage emitting opening 23 with the pressure of 11 bar.
• the present invention is constructed to perform two stage compression and two stage expansion, such that the compressor and the expander are disposed at both sides of the round plate and performs the compression and the expansion at identical rotation number, the compression is performed continuously without the pulsation pressure and the vibration, and the two stage high pressure compression is simply achieved by means of one geared rotor (moving gear).
• the compressor when the system is used in a changed form, the compressor can be operated as a pump without any difficulty, and the sealing between the high stage and the lower stage can be achieved by means of the lip seal (sleeve), and the stable rotation of the moving gear can be achieved.
• the expander is constructed as a compressor, and performs the two stage expansion to thereby increase the rotation force.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Applications Or Details Of Rotary Compressors (AREA)
• Engine Equipment That Uses Special Cycles (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=37900176

Family Applications (1)

Country Status (2)

Cited By (3)

Families Citing this family (1)

• 2005
  • 2005-09-27 KR KR1020050091149A patent/KR20070035394A/ko not_active Application Discontinuation
• 2006
  • 2006-09-19 WO PCT/KR2006/003720 patent/WO2007037599A2/fr active Application Filing

Also Published As

Similar Documents

Legal Events