WO2015016018A1 - Dispositif à cycle de rankine - Google Patents

Dispositif à cycle de rankine Download PDF

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Publication number
WO2015016018A1
WO2015016018A1 PCT/JP2014/068182 JP2014068182W WO2015016018A1 WO 2015016018 A1 WO2015016018 A1 WO 2015016018A1 JP 2014068182 W JP2014068182 W JP 2014068182W WO 2015016018 A1 WO2015016018 A1 WO 2015016018A1
Authority
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WIPO (PCT)
Prior art keywords
shaft seal
pump
working fluid
pressure
expander
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.)
Ceased
Application number
PCT/JP2014/068182
Other languages
English (en)
Japanese (ja)
Inventor
和雄 片山
尚也 横町
井口　雅夫
英文 森
榎島　史修
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Industries Corp
Original Assignee
Toyota Industries Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyota Industries Corp filed Critical Toyota Industries Corp
Publication of WO2015016018A1 publication Critical patent/WO2015016018A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/065—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle the combustion taking place in an internal combustion piston engine, e.g. a diesel engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C27/009—Shaft sealings specially adapted for pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/021—Control systems for the circulation of the lubricant
    • 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
    • F01C19/00—Sealing arrangements in rotary-piston machines or engines
    • F01C19/005—Structure and composition of sealing elements such as sealing strips, sealing rings and the like; Coating of these elements

Definitions

  • the present invention relates to a Rankine cycle device.
  • the Rankine cycle device includes a pump that pumps the working fluid, a heat exchanger that exchanges heat with the exhaust heat from the vehicle engine, and a working fluid that is heat-exchanged by the heat exchanger. It has an expander that outputs mechanical energy, a condenser that condenses the working fluid expanded by the expander, and a working fluid path.
  • the working fluid path sequentially connects a pump, a heat exchanger, an expander, and a condenser to circulate the working fluid.
  • the pump chamber is formed in the pump housing.
  • a pump shaft extending into the pump chamber is accommodated in the housing.
  • a pump operating section that operates in accordance with the rotational drive of the pump shaft. Then, the working fluid circulates in the working fluid path by the operation of the pump operating unit accompanying the rotational driving of the pump shaft.
  • a shaft seal member that seals between the housing and the pump shaft is housed in the housing.
  • a shaft seal chamber is defined by the shaft seal member, the pump shaft, the housing, and the pump operating portion.
  • the shaft seal member is an atmospheric shaft seal that prevents the working fluid in the shaft seal chamber from leaking to the atmosphere side by sealing between the housing and the pump shaft. Lubrication between the shaft seal member and the pump shaft is performed by lubricating oil contained in the working fluid supplied into the shaft seal chamber.
  • the shaft seal member cannot seal between the housing and the pump shaft.
  • the working fluid in the shaft seal chamber leaks to the atmosphere due to the differential pressure between the pressure in the shaft seal chamber and the atmospheric pressure. Therefore, for example, as in Patent Document 1, the difference between the pressure in the shaft seal chamber and the atmospheric pressure is established by communicating the outlet of the expander and the shaft seal chamber through a passage to reduce the pressure in the shaft seal chamber. It is conceivable to reduce the pressure. According to this, the working fluid in the shaft seal chamber is prevented from leaking to the atmosphere due to the differential pressure between the pressure in the shaft seal chamber and the atmospheric pressure.
  • the temperature of exhaust heat from the vehicle engine rises when the load applied to the vehicle engine increases due to load fluctuations that occur when the vehicle travels. Then, the temperature of the working fluid that exchanges heat with the exhaust heat from the vehicle engine in the heat exchanger also rises.
  • the higher the temperature of the working fluid the higher the condensation pressure required to condense and liquefy the working fluid in the condenser.
  • the pressure in the portion of the working fluid path between the expander outlet and the pump inlet is increased. Therefore, the pressure in the shaft seal chamber that communicates with a portion between the outlet of the expander and the inlet of the pump in the working fluid path via a passage that bypasses the condenser also increases.
  • a drive shaft that is rotationally driven by the expander unit is housed in the housing of the expander. Further, a shaft seal member that seals between the housing and the drive shaft is accommodated in the housing. A shaft seal chamber is defined by the shaft seal member, the drive shaft, and the housing.
  • the working fluid flowing in the working fluid path between the outlet of the heat exchanger and the inlet of the expander is supplied to the shaft seal chamber through a passage that bypasses the expander, so that it is included in the working fluid.
  • Lubricating oil lubricates between the shaft seal member and the drive shaft.
  • the passage is provided with a throttle portion, and the working fluid flowing through the passage is decompressed by the throttle portion.
  • the shaft seal chamber is connected to a portion between the outlet of the expander and the pump inlet in the working fluid path, and the working fluid supplied to the shaft seal chamber is connected to the expander outlet in the working fluid path. It is refluxed to the part between the inlet of the pump.
  • the shaft seal chamber is connected between the expander outlet and the pump inlet in the working fluid path. For this reason, when the condensing pressure of the condenser increases and the pressure in the portion of the working fluid path between the outlet of the expander and the inlet of the pump increases, the pressure in the shaft seal chamber increases. If the pressure in the shaft seal chamber exceeds the pressure resistance of the shaft seal member, the shaft seal member can no longer seal between the housing and the drive shaft, and the pressure difference between the pressure in the shaft seal chamber and atmospheric pressure. As a result, the working fluid in the shaft seal chamber leaks to the atmosphere side.
  • An object of the present invention is to provide a Rankine cycle device capable of preventing the working fluid in the shaft seal chamber from leaking to the atmosphere side.
  • a Rankine cycle device includes a pump that is a fluid machine, a heat exchanger, an expander that is a fluid machine, a condenser, a working fluid path, and a storage chamber. And a drive shaft, an operation part, a shaft seal member, a shaft seal chamber, a supply passage, a discharge passage, an on-off valve, a detection part, and a control part.
  • the working fluid path sequentially connects the pump, the heat exchanger, the expander, and the condenser to circulate the working fluid.
  • the storage chamber is formed by a housing of at least one of the pump and the expander.
  • the drive shaft is housed in the housing forming the housing chamber and extends into the housing chamber.
  • the operating portion is accommodated in the accommodating chamber and operates in accordance with the rotational drive of the drive shaft.
  • the shaft seal member is housed in the housing and seals between the housing and the drive shaft.
  • the shaft seal chamber is defined by the shaft seal member, the drive shaft, and the housing.
  • the supply passage is connected to the shaft seal chamber and supplies the working fluid to the shaft seal chamber.
  • the discharge passage is connected to the shaft seal chamber and discharges the working fluid in the shaft seal chamber to the working fluid path.
  • the shaft seal member is lubricated by the working fluid discharged from the supply passage to the discharge passage through the shaft seal chamber.
  • the discharge passage is connected to a portion of the working fluid path between the outlet of the expander and the inlet of the pump.
  • the on-off valve opens and closes the discharge passage.
  • the detection unit detects the pressure between the outlet of the expander and the inlet of the pump or the pressure between the outlet of the expander and the on-off valve.
  • the control unit controls the on-off valve to close the on-off valve when detecting that the pressure detected by the detection unit has reached a predetermined pressure.
  • the Rankine cycle apparatus 10 includes a composite fluid machine 20 in which a pump 11 that is a fluid machine and an expander 12 that is a fluid machine are integrated.
  • the Rankine cycle apparatus 10 includes a working fluid path 15 that sequentially connects the pump 11, the heat exchanger 13, the expander 12, and the condenser 14 to circulate the working fluid.
  • the working fluid path 15 includes a first flow path 50a to a sixth flow path 50f.
  • the housing 21 of the composite fluid machine 20 is formed of a housing main body 22 having a covered cylindrical shape and a rear housing 23 joined to an opening end of the housing main body 22.
  • a drive shaft 24 is accommodated in the housing body 22.
  • the housing body 22 has a lid portion 22a.
  • a concave portion 221 a is formed on the surface of the lid portion 22 a facing the housing 21 so as to surround the drive shaft 24.
  • the side plate 26 is fixed to the surface of the lid 22a facing the housing 21, whereby the recess 221a is closed, and a pump chamber 27 serving as a storage chamber is defined between the lid 22a and the side plate 26.
  • a driven gear 28 is rotatably accommodated in the pump chamber 27.
  • a drive shaft 24 extends from the housing body 22 in the pump chamber 27.
  • a main drive gear 29 attached to the drive shaft 24 is accommodated in the pump chamber 27.
  • the driven gear 28 and the main driving gear 29 are accommodated in the pump chamber 27 while being engaged with each other.
  • the driven gear 28 and the main driving gear 29 constitute a pump operating unit 30 as an operating unit that operates in accordance with the rotational drive of the drive shaft 24.
  • a suction passage 31 communicating with the pump chamber 27 (recess 221a) is formed in the lid portion 22a.
  • the suction passage 31 is formed in the upper part of the composite fluid machine 20 so as to open on the upper surface of the housing body 22.
  • a discharge passage 32 communicating with the pump chamber 27 (recess 221a) is formed in the lid portion 22a.
  • the discharge passage 32 is formed so as to be positioned below the pump chamber 27.
  • a substantially cylindrical support block 34 fixed to the housing 21 is provided in the housing main body 22.
  • the support block 34 constitutes a part of the housing 21.
  • the support block 34 partitions the housing body 22 into a space near the rear housing 23 and a space near the lid portion 22a.
  • a second end portion (portion near the rear housing 23) of the drive shaft 24 passes through the side plate 26 and is inserted into the support block 34.
  • a seal member 34 s is disposed between the support block 34 and the drive shaft 24. The seal member 34 s seals between the inner peripheral surface of the support block 34 and the peripheral surface of the drive shaft 24.
  • an eccentric shaft 24a is provided at a position eccentric with respect to the central axis L of the drive shaft 24.
  • the eccentric shaft 24 a revolves around the central axis L by the rotation of the drive shaft 24.
  • a bush 24b is fixed to the eccentric shaft 24a.
  • the bush 24b revolves around the central axis L together with the eccentric shaft 24a.
  • a counterweight 24d is fixed to the bush 24b.
  • the expander 12 has an expander unit 12 a as an operating unit composed of a movable scroll 35 and a fixed scroll 36.
  • the movable scroll 35 is rotatably supported by the bush 24b via the bearing device 24c.
  • the expander portion 12a fixed to the housing body 22 so that the fixed scroll 36 is opposed to the movable scroll 35 between the support block 34 and the rear housing 23 includes the support block 34 and the rear housing 23 in the housing body 22.
  • the movable scroll 35 includes a movable substrate 35a having a disk shape supported by the bearing device 24c, and a spiral movable movable spiral wall 35b protruding from the movable substrate 35a.
  • the fixed scroll 36 includes a disk-shaped fixed side substrate 36a, and a spiral fixed side spiral wall 36b protruding from the fixed side substrate 36a toward the movable side substrate 35a.
  • the movable-side spiral wall 35b of the movable scroll 35 and the fixed-side spiral wall 36b of the fixed scroll 36 are combined with each other to define a working chamber 37 whose volume can be changed.
  • a suction port 36c is formed in the center of the fixed side substrate 36a.
  • a suction chamber 38 is defined between the fixed-side substrate 36a and the rear housing 23, and the suction chamber 38 communicates with the working chamber 37 before expansion through a suction port 36c.
  • a suction port 39 communicating with the suction chamber 38 is formed in the rear housing 23 .
  • a discharge chamber 40 is defined between the inner peripheral surface of the fixed scroll 36 and the outermost peripheral surface of the movable scroll 35.
  • the discharge chamber 40 communicates with a discharge space 41 defined between the support block 34 and the side plate 26 in the housing body 22 through a through hole 34 h of the support block 34.
  • a discharge port 42 communicating with the discharge space 41 is formed in the upper portion of the housing body 22.
  • the housing 21 of the composite fluid machine 20 serves as both the housing of the pump 11 and the housing of the expander 12.
  • the drive shaft 24 serves as both the pump shaft of the pump 11 and the drive shaft of the expander 12.
  • annular shaft seal member 47 that seals between the lid portion 22 a of the housing body 22 and the drive shaft 24 is accommodated.
  • a shaft seal chamber 46 is defined by the shaft seal member 47, the drive shaft 24, the lid portion 22 a of the housing body 22, and the pump operating unit 30.
  • the shaft seal member 47 is an atmospheric shaft seal that prevents the working fluid in the shaft seal chamber 46 from leaking to the atmosphere side by sealing between the lid portion 22 a of the housing body 22 and the drive shaft 24.
  • the shaft seal chamber 46 is formed in an annular shape so as to surround the drive shaft 24.
  • An annular seal member 48 that seals between the pump chamber 27 and the shaft seal chamber 46 is accommodated in the shaft seal chamber 46.
  • the first end portion of the drive shaft 24 is rotatably supported by the lid portion 22a via the rolling bearing 25, and the second end portion of the drive shaft 24 is provided with a rolling bearing 34a provided in the support block 34.
  • the rolling bearing 25 is disposed closer to the first end of the drive shaft 24 than the shaft seal chamber 46. That is, the rolling bearing 25 is disposed outside the shaft seal chamber 46.
  • the discharge passage 32 (the outlet of the pump 11) is connected to the heat absorber 13a (the inlet of the heat exchanger 13) of the heat exchanger 13 through the first flow path 50a.
  • the heat exchanger 13 includes a heat radiator 13b in addition to the heat absorber 13a.
  • the radiator 13b is provided on an exhaust pipe E1 connected to the vehicle engine E. And the exhaust gas discharged
  • the outlet of the heat absorber 13a of the heat exchanger 13 (the outlet of the heat exchanger 13) is connected to the suction port 39 (the inlet of the expander 12) via the second flow path 50b.
  • the high-temperature and high-pressure working fluid heated and vaporized by the heat exchanger 13 is sucked into the working chamber 37 through the second flow path 50b, the suction port 39, the suction chamber 38, and the suction port 36c.
  • the working fluid sucked into the working chamber 37 expands in the working chamber 37, and a part of the heat quantity of the working fluid is taken out as mechanical energy, and power generation by a generator (not shown), torque assistance of the vehicle engine E, etc. Done.
  • the discharge port 42 (exit of the expander 12) is connected to the inlet of the condenser 14 via the third flow path 50c.
  • the high-temperature and low-pressure working fluid expanded by the expander 12 is discharged to the condenser 14 via the third flow path 50c.
  • the working fluid discharged to the condenser 14 is condensed and liquefied by heat exchange with the outside air.
  • the outlet of the condenser 14 is connected to the inlet of the gas-liquid separator 17 via the fourth flow path 50d.
  • the gas-liquid separator 17 is provided with a fourth flow path 50d in a saturated state in which the working fluid condensed and liquefied by the condenser 14 and the working fluid that is not condensed by the condenser 14 and remains in a gaseous state are mixed. Inhaled through.
  • the gas-liquid separator 17 separates the liquefied working fluid from the working fluid in a gas state.
  • the outlet of the gas-liquid separator 17 is connected to the inlet of the supercooler 16 via the fifth flow path 50e. Then, the liquid working fluid separated by the gas-liquid separator 17 is sent to the supercooler 16 via the fifth flow path 50 e and is cooled by the supercooler 16.
  • the outlet of the subcooler 16 is connected to the suction passage 31 (the inlet of the pump 11) via the sixth flow path 50f.
  • the low-temperature working fluid cooled by the subcooler 16 is sucked into the pump chamber 27 through the sixth flow path 50 f and the suction path 31.
  • the working fluid having a low temperature cooled by the subcooler 16 is sent into the pump chamber 27, the occurrence of cavitation in the pump chamber 27 is suppressed. Then, the working fluid circulates through the working fluid path 15 by the operation of the pump operating unit 30.
  • the working fluid is an array of the expander 12, the condenser 14, the gas-liquid separator 17, the supercooler 16, the pump 11 of the composite fluid machine 20, and the heat exchanger 13 of the composite fluid machine 20. It flows through the circuit (working fluid path 15) along the order.
  • the shaft seal chamber 46 is connected to a supply passage 51 a that supplies the working fluid to the shaft seal chamber 46 and a discharge passage 51 b that discharges the working fluid in the shaft seal chamber 46 to the working fluid passage 15.
  • the supply passage 51a is connected to the second flow path 50b (a portion between the outlet of the heat exchanger 13 and the inlet of the expander 12 in the working fluid path 15).
  • the supply passage 51a is provided with a throttle portion 51s, and the working fluid flowing through the supply passage 51a is decompressed by the throttle portion 51s.
  • the discharge passage 51b is connected to the third flow path 50c. Therefore, the discharge passage 51 b is connected to a portion of the working fluid passage 15 between the outlet of the expander 12 and the inlet of the pump 11.
  • the supply passage 51a is connected to a portion of the working fluid passage 15 where the pressure is higher than that of the discharge passage 51b.
  • the open / close valve 52 is disposed in the discharge passage 51b.
  • the on-off valve 52 is controlled by the control unit 55.
  • the Rankine cycle apparatus 10 includes a pressure sensor 53 as a detection unit that detects a pressure between the outlet of the expander 12 and the inlet of the pump 11.
  • the pressure sensor 53 is disposed in the sixth flow path 50f.
  • the pressure sensor 53 is electrically connected to the control unit 55. Information detected by the pressure sensor 53 is sent to the control unit 55.
  • the control unit 55 controls the on-off valve 52 so as to close the on-off valve 52 when information indicating that the pressure detected by the pressure sensor 53 has reached a predetermined pressure is sent from the pressure sensor 53.
  • the “predetermined pressure” is a pressure lower than the pressure resistance of the shaft seal member 47 (a limit pressure that the shaft seal member 47 can withstand).
  • the design pressure of the shaft seal member 47 is set to the maximum value of the pressure that can be generated in the normal operation state of the Rankine cycle apparatus 10. In the present embodiment, the “predetermined pressure” is equal to the design pressure of the shaft seal member 47.
  • the control unit 55 controls the on-off valve 52 to open the on-off valve 52 when information indicating that the pressure detected by the pressure sensor 53 is lower than a predetermined pressure is sent from the pressure sensor 53. To do.
  • the shaft seal member 47 is lubricated by the working fluid discharged from the supply passage 51a through the shaft seal chamber 46 to the discharge passage 51b. Further, since the discharge passage 51b is connected to a portion of the working fluid path 15 between the outlet of the expander 12 and the inlet of the pump 11, the pressure in the shaft seal chamber 46 is increased between the outlet of the expander 12 and the pump. The pressure between 11 inlets is approached. Therefore, the working fluid in the shaft seal chamber 46 is prevented from leaking to the atmosphere due to the differential pressure between the pressure in the shaft seal chamber 46 and the atmospheric pressure.
  • the discharge passage 51b is not provided with a throttle portion.
  • the pressure in the shaft seal chamber 46 becomes an intermediate pressure between the pressure in the supply passage 51a and the pressure between the outlet of the expander 12 and the inlet of the pump 11. There is a risk that.
  • the pressure in the shaft seal chamber 46 does not become an intermediate pressure. Accordingly, it is possible to prevent the pressure in the shaft seal chamber 46 from becoming an intermediate pressure that is always constant and the constant pressure being constantly applied to the shaft seal member 47.
  • the control unit 55 controls the on-off valve 52 so as to close the on-off valve 52 when information indicating that the pressure detected by the pressure sensor 53 has reached a predetermined pressure is sent from the pressure sensor 53.
  • the third flow path 50c and the shaft seal chamber 46 are not in communication, and the pressure in the shaft seal chamber 46 is prevented from becoming higher than a predetermined pressure.
  • the pressure in the shaft seal chamber 46 exceeds the pressure resistance of the shaft seal member 47, and the shaft seal member 47 is located between the housing body 22 and the drive shaft 24, specifically, the lid portion 22 a of the housing body 22 and the drive shaft. It is prevented that it is impossible to seal between 24. This prevents the working fluid in the shaft seal chamber 46 from leaking to the atmosphere due to the differential pressure between the pressure in the shaft seal chamber 46 and the atmospheric pressure.
  • control part 55 will control the on-off valve 52 so that the on-off valve 52 may be opened, if the information to the effect that the pressure detected by the pressure sensor 53 is less than predetermined pressure is sent from the pressure sensor 53. .
  • the third flow path 50c and the shaft seal chamber 46 communicate with each other via the discharge passage 51b. Therefore, the pressure in the shaft seal chamber 46 approaches the pressure between the outlet of the expander 12 and the inlet of the pump 11. As a result, the working fluid in the shaft seal chamber 46 is prevented from leaking to the atmosphere due to the pressure difference between the pressure in the shaft seal chamber 46 and the atmospheric pressure.
  • the Rankine cycle device 10 includes an on-off valve 52 that opens and closes the discharge passage 51b, and a pressure sensor 53 that detects the pressure between the outlet of the expander 12 and the inlet of the pump 11. Further, the Rankine cycle apparatus 10 closes the on-off valve 52 when the pressure sensor 53 detects information that the pressure between the outlet of the expander 12 and the inlet of the pump 11 has reached a predetermined pressure. And a control unit 55 for controlling the on-off valve 52. According to this, the control unit 55 closes the on-off valve 52 when the pressure sensor 53 detects information that the pressure between the outlet of the expander 12 and the inlet of the pump 11 has reached a predetermined pressure.
  • the on-off valve 52 is controlled. For this reason, the portion of the working fluid path 15 between the outlet of the expander 12 and the inlet of the pump 11 is disconnected from the shaft seal chamber 46, and the pressure in the shaft seal chamber 46 becomes higher than a predetermined pressure. Can be prevented. As a result, the pressure in the shaft seal chamber 46 exceeds the pressure resistance of the shaft seal member 47, and the shaft seal member 47 cannot seal between the lid portion 22 a of the housing body 22 and the drive shaft 24. Can be prevented. Therefore, it is possible to prevent the working fluid in the shaft seal chamber 46 from leaking to the atmosphere due to the differential pressure between the pressure in the shaft seal chamber 46 and the atmospheric pressure.
  • the supply passage 51a is connected to a portion of the working fluid passage 15 where the pressure is higher than that of the discharge passage 51b, and the supply passage 51a is provided with a throttle portion 51s. According to this, the flow of the working fluid discharged from the supply passage 51a to the discharge passage 51b through the shaft seal chamber 46 can be made smooth.
  • the control unit 55 opens the on-off valve 52 when the pressure sensor 53 detects information that the pressure between the outlet of the expander 12 and the inlet of the pump 11 is lower than a predetermined pressure.
  • the on-off valve 52 is controlled. According to this, when the pressure between the outlet of the expander 12 and the inlet of the pump 11 is lower than a predetermined pressure, the portion between the outlet of the expander 12 and the inlet of the pump 11 in the working fluid path 15.
  • the shaft seal chamber 46 communicate with each other through the discharge passage 51b. Therefore, the pressure in the shaft seal chamber 46 can be brought close to the pressure between the outlet of the expander 12 and the inlet of the pump 11. As a result, it is possible to prevent the working fluid in the shaft seal chamber 46 from leaking to the atmosphere due to the differential pressure between the pressure in the shaft seal chamber 46 and the atmospheric pressure.
  • the pressure sensor 53 detects the pressure between the outlet of the expander 12 and the inlet of the pump 11. According to this, the control part 55 controls the on-off valve 52 using the information on the pressure between the outlet of the expander 12 and the inlet of the pump 11. Therefore, it is possible to easily prevent the pressure in the shaft seal chamber 46 from becoming higher than a predetermined pressure.
  • a seal member 48 that seals between the pump chamber 27 and the shaft seal chamber 46 is provided between the housing body 22 and the drive shaft 24. According to this, it is possible to prevent the working fluid in the pump chamber 27 from flowing into the shaft seal chamber 46 between the housing body 22 and the drive shaft 24. Therefore, it is possible to prevent the working fluid in the pump chamber 27 from flowing into the shaft seal chamber 46 and increasing the pressure in the shaft seal chamber 46.
  • a housing 21A of the expander 20A is formed of a housing main body 22A having a covered cylindrical shape and a rear housing 23A joined to an opening end of the housing main body 22A.
  • a drive shaft 24A is accommodated in the housing main body 22A.
  • a substantially cylindrical support block 34A fixed to the housing 21A is provided in the housing main body 22A.
  • the support block 34A constitutes a part of the housing 21A.
  • the support block 34A partitions the housing body 22A into a space near the rear housing 23A and a space near the lid portion 22a of the housing body 22A.
  • a second end portion (a portion near the rear housing 23A) of the drive shaft 24A is inserted into the support block 34A.
  • the expander portion 12a is accommodated in the accommodating chamber 12b defined between the support block 34 and the rear housing 23A in the housing main body 22.
  • annular shaft seal member 47A that seals between the lid portion 22a of the housing main body 22A and the drive shaft 24A is accommodated.
  • a shaft seal chamber 46A is defined by the shaft seal member 47A, the drive shaft 24A, and the lid portion 22a of the housing body 22A.
  • the shaft seal member 47A is an atmospheric shaft seal that prevents the working fluid in the shaft seal chamber 46A from leaking to the atmosphere side by sealing between the lid portion 22a of the housing body 22A and the drive shaft 24A.
  • the shaft seal chamber 46A is formed in an annular shape so as to surround the drive shaft 24A.
  • An annular seal member 34s that seals between the storage chamber 12b and the shaft seal chamber 46A is disposed between the support block 34A and the drive shaft 24A.
  • the supply passage 61 is provided with an opening adjustment valve 61 v that can adjust the opening of the supply passage 61.
  • the opening adjustment valve 61v is controlled by the control unit 55.
  • the working fluid flowing through the supply passage 61 is decompressed by the opening adjustment valve 61v. Therefore, the opening adjustment valve 61v functions as a throttle part.
  • the shaft seal chamber 46A communicates with the third flow path 50c via the discharge passage 51A.
  • the supply passage 61 and the discharge passage 51 ⁇ / b> A are connected to the low pressure side in the working fluid passage 15.
  • the discharge passage 51A is connected to the downstream portion (third flow passage 50c) in the working fluid flow direction in the working fluid passage 15 with respect to the portion of the working fluid passage 15 to which the supply passage 61 is connected (discharge space 41).
  • the pressure in the discharge space 41 to which the supply passage 61 is connected is higher than the pressure in the third passage 50c to which the discharge passage 51A is connected because pressure loss occurs by the amount of the third passage 50c. .
  • An open / close valve 52A is disposed in the discharge passage 51A.
  • the on-off valve 52A is controlled by the control unit 55.
  • the control unit 55 sends the information that the pressure detected by the pressure sensor 53 has reached a predetermined pressure from the pressure sensor 53, so that the opening degree adjustment valve 61v and the opening / closing valve 52A are closed.
  • the adjustment valve 61v and the on-off valve 52A are controlled.
  • the control unit 55 sends information indicating that the pressure detected by the pressure sensor 53 is below a predetermined pressure from the pressure sensor 53, so that the opening adjustment valve 61v and the on-off valve 52A are opened.
  • the opening adjustment valve 61v and the opening / closing valve 52A are controlled.
  • the shaft seal member 47A is lubricated by the working fluid discharged from the supply passage 61 to the discharge passage 51A through the shaft seal chamber 46A. Further, the discharge passage 51 ⁇ / b> A is connected to a portion of the working fluid passage 15 between the outlet (discharge port 42) of the expander 20 ⁇ / b> A and the inlet of the pump 11. Therefore, the pressure in the shaft seal chamber 46 ⁇ / b> A approaches the pressure between the outlet of the expander 20 ⁇ / b> A and the inlet of the pump 11. Therefore, the working fluid in the shaft seal chamber 46A is prevented from leaking to the atmosphere due to the differential pressure between the pressure in the shaft seal chamber 46A and the atmospheric pressure.
  • the control unit 55 sends the information that the pressure detected by the pressure sensor 53 has reached a predetermined pressure from the pressure sensor 53, so that the opening degree adjustment valve 61v and the opening / closing valve 52A are closed.
  • the adjustment valve 61v and the on-off valve 52A are controlled.
  • the discharge space 41 and the shaft seal chamber 46A are disconnected from each other, and the third flow path 50c and the shaft seal chamber 46A are disconnected from each other, so that the pressure in the shaft seal chamber 46A becomes higher than a predetermined pressure. Is prevented.
  • the pressure in the shaft seal chamber 46A exceeds the pressure resistance of the shaft seal member 47A, and the shaft seal member 47A cannot seal between the lid portion 22a of the housing body 22A and the drive shaft 24A. Is prevented. Therefore, the working fluid in the shaft seal chamber 46A is prevented from leaking to the atmosphere due to the pressure difference between the pressure in the shaft seal chamber 46A and the atmospheric pressure.
  • the control unit 55 sends information indicating that the pressure detected by the pressure sensor 53 is lower than the predetermined pressure, so that the opening degree adjusting valve 61v and the opening / closing valve 52A are opened.
  • the opening adjustment valve 61v and the opening / closing valve 52A are controlled.
  • the second flow path 50b (a portion between the outlet of the heat exchanger 13 and the inlet of the expander 20A in the working fluid path 15) and the shaft seal chamber. 46A may communicate with the supply passage 61A.
  • a switching valve 62v is disposed in the supply passage 61A.
  • the switching valve 62v is controlled by the control unit 55.
  • the control unit 55 controls the switching valve 62v so as to close the switching valve 62v when information indicating that the pressure detected by the pressure sensor 53 has reached a predetermined pressure is sent from the pressure sensor 53.
  • the supply passage 61A is provided with a throttle portion 61s, and the working fluid flowing through the supply passage 61A is decompressed by the throttle portion 61s.
  • the working fluid flowing between the outlet of the heat exchanger 13 and the inlet of the expander 20A can be supplied to the shaft seal chamber 46A via the supply passage 61A bypassing the expander 20A. Therefore, the lubrication oil contained in the working fluid can improve the lubrication between the shaft seal member 47A and the drive shaft 24A.
  • the switching valve 62v may be deleted. In this case, even if the pressure between the outlet of the expander 12 and the inlet of the pump 11 reaches a predetermined pressure, the pressure is reduced by the throttle portion 61s. Therefore, the working fluid from the second flow path 50b flows into the shaft seal chamber 46A via the supply passage 61A, so that the pressure in the shaft seal chamber 46A does not immediately reach a predetermined pressure.
  • the supply passage 51 a may be connected to a portion of the working fluid path 15 between the outlet of the heat exchanger 13 and the inlet of the subcooler 16.
  • the supply passage 51 a may be connected to the gas-liquid separator 17.
  • the working fluid in the gas-liquid separator 17 is in a surely saturated state in which the working fluid condensed and liquefied by the condenser 14 is mixed with the working fluid in a gas state without being condensed by the condenser 14. .
  • the saturated working fluid can be supplied to the shaft seal chamber 46 via the supply passage 51a, and the shaft seal chamber 46 can be saturated. In the saturated state, if even a little heat is applied, the working fluid becomes a vaporized gas state.
  • the working fluid in the sliding portion can be changed from a saturated state to a gas state by heat generated by sliding between the shaft seal member 47 and the drive shaft 24. Thereby, it can suppress that the viscosity of lubricating oil falls by mixing a liquid working fluid and lubricating oil. Since the working fluid cooled and liquefied by the supercooler 16 is in a supercooled state, the working fluid cannot be vaporized only by the heat generated by the sliding between the shaft seal member 47 and the drive shaft 24. . Therefore, the shaft seal member 47 and the drive shaft 24 are compared with the case where the lubricant between the shaft seal member 47 and the drive shaft 24 is lubricated with the lubricating oil contained in the working fluid cooled and liquefied by the subcooler 16. The lubricating performance between the two can be improved.
  • the pump 11 and the expander 12 may be separate bodies.
  • the pump shaft of the pump 11 and the drive shaft of the expander 12 may be used as a single drive shaft, or the pump shaft of the pump 11 and the drive shaft of the expander 12 are provided individually. May be.
  • the pressure sensor 53 detects the pressure between the outlet of the expander 12, 20A and the inlet of the pump 11 or the pressure between the outlet of the expander 12, 20A and the on-off valve 52, 52A.
  • the arrangement place is not particularly limited.
  • the control unit 55 detects the on-off valves 52, 52A.
  • the on-off valves 52 and 52A may be controlled so as to close the valve.
  • a temperature sensor that detects the temperature of the condenser 14 may be used as the detection unit.
  • the temperature of the condenser 14 is correlated with the condensation pressure. Therefore, for example, the condensing pressure can be detected from the temperature detected by the temperature sensor using a map that associates the temperature of the condenser 14 with the condensing pressure.
  • the pressure of the portion between the outlet of the expander 12 and the inlet of the pump 11 in the working fluid path 15 may be detected using a temperature sensor.
  • the predetermined pressure may be a pressure lower than the pressure resistance of the shaft seal members 47 and 47A (the limit pressure that the shaft seal members 47 and 47A can withstand).
  • the predetermined pressure may be a pressure lower than the design pressure of the shaft seal members 47 and 47A.
  • the predetermined pressure may be a pressure lower than the pressure resistance of the shaft seal members 47 and 47A and higher than the design pressure of the shaft seal members 47 and 47A.
  • the flow passage diameters of the supply passages 51a, 61, 61A may be made such that the working fluid flowing through the supply passages 51a, 61, 61A is depressurized.
  • path 51a, 61, 61A itself can be functioned as a throttle part. According to this, it is not necessary to separately provide the throttle portions 51s and 61s and the opening degree adjusting valve 61v.
  • a seal member that seals between the discharge space 41 and the shaft seal chamber 46A may be provided between the housing 21A and the drive shaft 24A.
  • the pump operating unit 30 may not be configured by the driven gear 28 and the main driving gear 29, and may be a pump operating unit 30 of another form.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

L'invention porte sur un dispositif à cycle de Rankine, lequel dispositif comprend une pompe, un échangeur de chaleur, un détendeur, un condenseur, un passage de fluide fonctionnel, une chambre de réception, un arbre d'entraînement, une unité d'actionnement, un élément de joint d'étanchéité d'arbre, une chambre de joint d'étanchéité d'arbre, un passage de distribution, un passage de décharge, une vanne d'ouverture et de fermeture, une unité de détection et une unité de commande. Le passage de distribution distribue un fluide fonctionnel à la chambre de joint d'étanchéité. Le passage de décharge décharge le fluide fonctionnel à l'intérieur de la chambre de joint d'étanchéité d'arbre dans le passage de fluide fonctionnel. L'élément de joint d'étanchéité d'arbre est lubrifié par le fluide fonctionnel déchargé à partir du passage de distribution dans le passage de décharge par l'intermédiaire de la chambre de joint d'étanchéité d'arbre. Le passage de décharge est relié à la partie du passage de fluide fonctionnel qui située entre la sortie du détendeur et l'entrée de la pompe. La vanne d'ouverture et de fermeture ouvre et ferme le passage de décharge. L'unité de détection détecte la pression entre la sortie du détendeur et l'entrée de la pompe. L'unité de commande ferme la vanne d'ouverture et de fermeture lors de la détection d'une information indiquant que la pression détectée par l'unité de détection a atteint une pression prédéterminée.
PCT/JP2014/068182 2013-08-02 2014-07-08 Dispositif à cycle de rankine Ceased WO2015016018A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013-161543 2013-08-02
JP2013161543A JP2015031210A (ja) 2013-08-02 2013-08-02 ランキンサイクル装置

Publications (1)

Publication Number Publication Date
WO2015016018A1 true WO2015016018A1 (fr) 2015-02-05

Family

ID=52431558

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2014/068182 Ceased WO2015016018A1 (fr) 2013-08-02 2014-07-08 Dispositif à cycle de rankine

Country Status (2)

Country Link
JP (1) JP2015031210A (fr)
WO (1) WO2015016018A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112302723A (zh) * 2019-07-29 2021-02-02 丰田自动车株式会社 膨胀机和燃料电池系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011196315A (ja) * 2010-03-23 2011-10-06 Toyota Industries Corp 複合流体機械
JP2013096340A (ja) * 2011-11-02 2013-05-20 Toyota Industries Corp 廃熱回生システム
JP2013096322A (ja) * 2011-11-02 2013-05-20 Toyota Industries Corp 廃熱回生システム

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011196315A (ja) * 2010-03-23 2011-10-06 Toyota Industries Corp 複合流体機械
JP2013096340A (ja) * 2011-11-02 2013-05-20 Toyota Industries Corp 廃熱回生システム
JP2013096322A (ja) * 2011-11-02 2013-05-20 Toyota Industries Corp 廃熱回生システム

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112302723A (zh) * 2019-07-29 2021-02-02 丰田自动车株式会社 膨胀机和燃料电池系统

Also Published As

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