JP2006112262A - Expander and rankine system using this expander - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an expander and a Rankine system using this expander, without requiring to connecting a generator of a separate body via a motive power transmission mechanism, by performing operation by only one of two expansion mechanisms without using a bypass circuit. <P>SOLUTION: Since first and second generators 2e are driven by a rotary shaft of the first and second expansion mechanisms 2b and 2c, the operation by only one of the respective expansion mechanisms 2b and 2c can be performed without using the bypass circuit, and the whole system can be miniaturized. The first generator 2d is integrally arranged on one end side of an expander body 2a, and since the second generator 2e is integrally arranged on its other end side, a structure can be simplified and cost can be reduced without requiring to connect the generator of a separate body via the motive power transmission mechanism. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an expander that generates power by a fluid evaporated using heat generated in nature such as sunlight, waste heat of an internal combustion engine or boiler, factory waste heat, etc. as a heat source, and a Rankine system using the expander. is there.

  Conventionally, this type of Rankine system includes an evaporator that heats and evaporates a working fluid by a predetermined heat source, a power generator such as a turbine that generates power by expansion of the working fluid evaporated by the evaporator, and power generation. It is equipped with a condenser that condenses the working fluid flowing out from the machine and a pump that sucks the working fluid flowing out from the condenser and discharges it to the evaporator side. The power generator drives the generator and distributes the condenser. There is known one that generates hot water used for hot water supply or heating by the heat of the working fluid (see, for example, Patent Document 1).

  In the Rankine system, when power is generated by a single expander, the power generation capacity is often insufficient, and the rotation speed of the expander tends to be high, so the load on the expander becomes excessive. There is a point.

  In addition, two expanders connected to two generators are connected in series, and the fluid expanded in one expander is caused to flow from one expander to the other expander, and further in the other expander. There has also been proposed an apparatus in which each generator is driven by each expander by being expanded. Furthermore, there is a proposal that a bypass circuit is connected to the inflow side of the other expander so that only one of the expanders can be used, such as when it is desired to increase the amount of heat of the working fluid to the hot water supply side when the hot water supply capacity is insufficient. Yes.

Also, a scroll type expander that has two expansion mechanisms that are coaxially connected to each other, and that is capable of miniaturization while having the capacity of two expanders by driving a generator by each expansion mechanism. Has been proposed (see, for example, Patent Document 2).
JP 2004-60550 A JP 2002-174186 A

  However, as described above, when two expanders are used, the power generation capacity can be increased as compared with the case where one expander is used, but the number of expanders increases and the other expander increases. Since the bypass circuit is connected to the inflow side, the entire system becomes large.

  In addition, in an expander that is integrally provided with two expansion mechanisms, the two expansion mechanisms are coaxially connected to each other. For example, when the hot water supply capacity is insufficient, it is not possible to switch to the operation of only one expansion mechanism. And there was a problem that it was not possible to accurately respond to the usage of hot water.

  Furthermore, in any expander, since a separate generator is connected to the expander, a space for installing the expander and the generator is required, and the power generator as a whole cannot be sufficiently downsized. There was a point. In this case, it is necessary to connect the expander and the generator via a power transmission mechanism such as a rotating shaft and gears which are separate parts, and there is a problem that the structure is complicated and the cost is high.

  The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to perform operation by only one of the two expansion mechanisms without using a bypass circuit, and a separate generator It is an object of the present invention to provide an expander that does not need to be connected via a power transmission mechanism and a Rankine system using the expander.

  In order to achieve the above object, the present invention provides a first expansion mechanism that is disposed on one end side of an expander body and rotates a rotating shaft by expansion of a fluid flowing into one end side of the expander body, and an expander body. And a second expansion mechanism that rotates the rotating shaft by expansion of the fluid that has flowed into the other end of the expander body, and is integrated with one end of the expander body. And a second generator that is integrally provided on the other end side of the expander body and that is driven by the rotation shaft of the second expansion mechanism. With a generator.

  As a result, the first generator is driven by the rotating shaft of the first expansion mechanism, and the second generator is driven by the rotating shaft of the second expansion mechanism. By allowing the fluid to flow in, operation using only one expansion mechanism is possible without using a bypass circuit. In addition, since the first and second generators driven by the first and second expansion mechanisms are integrally provided on one end side and the other end side of the expander main body, power is transmitted to separate generators. There is no need to connect through a mechanism.

  In order to achieve the above object, the present invention provides an evaporator that heats and evaporates a working fluid with a predetermined heat source, a power generator that generates power by expansion of the working fluid evaporated by the evaporator, In the Rankine system comprising a condenser for condensing the working fluid flowing out from the machine and a pump for sucking the working fluid flowing out from the condenser and discharging it to the evaporator side, and generating electric power using the power generator as a drive source, The expander of the said structure is used as a motive power generator.

  As a result, since the expander having the above-described configuration is used as a power generator, operation by one expansion mechanism can be performed without using a bypass circuit as described above, and a separate generator can be powered by the expander. There is no need to connect via a transmission mechanism.

  According to the present invention, since the operation by one of the two expansion mechanisms can be performed without using a bypass circuit, the entire system can be reduced in size, and the use situation can be appropriately handled. be able to. Moreover, since it is not necessary to connect a separate generator via a power transmission mechanism, the structure can be simplified and the cost can be reduced.

  1 to 4 show an embodiment of the present invention. FIG. 1 is a side sectional view of an expander, FIG. 2 is an exploded side sectional view of an essential part thereof, FIG. 3 is a front view of a rotor and a magnet, and FIG. FIG. 2 is a schematic configuration diagram of a Rankine system.

  The Rankine system of this embodiment includes an evaporator 1 that evaporates the working fluid, an expander 2 that serves as a power generator that generates power by expansion of the working fluid evaporated by the evaporator 1, and an operation that flows out of the expander 2. A condenser 3 that condenses the fluid, a pump 4 that sucks the working fluid flowing out of the condenser 3 and discharges it to the evaporator 1 side, and a heat medium circuit that circulates a heat medium that exchanges heat with the working fluid in the condenser 3 5, a bypass flow path 6 that branches from the downstream flow path of the evaporator 1, a hot water heater 7 that generates hot water by heating a heat medium flowing through the heat medium circuit 5, and a fluid in the water heater 7 can be heated. And an auxiliary heater 8 for generating power using the expander 2 as a drive source.

  The evaporator 1 is configured to evaporate the working fluid flowing through the inside by heat exchange with an external heat medium (water, brine, etc.), and the heat medium is a predetermined heat source (for example, natural energy such as sunlight, It is supplied from the factory waste heat etc.) via the heat medium circuit 1a.

  The expander 2 is a scroll type expander described later, and the inflow side of the working fluid is connected to the evaporator 1 and the outflow side thereof is connected to the condenser 3.

  The condenser 3 is configured to condense the working fluid flowing through the inside by heat exchange with the heat medium (water, brine, etc.) of the heat medium circuit 5.

  The pump 4 is a well-known device that pumps the working fluid, and is provided between the evaporator 1 and the condenser 3.

  The heat medium circuit 5 is configured to circulate the heat medium to the condenser 3 and the water heater 7, and a heat medium circulation pump 5 a is provided on the inflow side of the condenser 3.

  One end of the bypass channel 6 is connected to the channel between the evaporator 1 and the expander 2, and the other end is connected to the upstream side of the condenser 3. One end of the bypass flow path 6 is provided with a three-way valve 6a as a flow path switching valve, and the working fluid flowing out from the evaporator 1 is arbitrarily circulated to the bypass flow path 6 by the three-way valve 6a.

  The water heater 7 includes a tank 7a for storing hot water A, a heating unit 7b including a part of the heat medium circuit 5 disposed in the tank 7a, and a discharge valve 7c for discharging the hot water in the tank 7a to the outside. The hot water of predetermined temperature can be discharged arbitrarily from the discharge valve 7c.

  The auxiliary heater 8 is composed of a heating wire provided in the tank 7a of the water heater 7, and can be arbitrarily energized from a power source (not shown).

  Next, the expander 2 used for the Rankine system will be described. That is, the expander 2 is disposed on the expander body 2a formed in a hollow shape, the first expansion mechanism 2b disposed on one end side of the expander body 2a, and the other end side of the expander body 2a. A second expansion mechanism 2c, a first generator 2d disposed on one end side of the expander body 2a, and a second generator 2e disposed on the other end side of the expander body 2a. Yes.

  The expander body 2a includes a cylindrical first housing 11 that is open at both ends in the axial direction, and a pair of second housings 12 that close the openings at both ends of the first housing 11, respectively. The two housings 11 and 12 are connected to each other by bolts (not shown). An extension portion 12a extending in a cylindrical shape in the axial direction is provided on one end side of the second housing 12, and a long hole 12b extending in the radial direction is provided on one end side in the radial direction of the other end surface.

  A first inflow port 11a for allowing fluid to flow into the first expansion mechanism 2b side and a second for flowing fluid into the second expansion mechanism 2c side at the upper part on the axially central side of the first housing 11 An inflow port 11b is provided, and the first and second inflow ports 11a and 11b are arranged close to each other in the axial direction of the expander body 2a. Also, in the lower part of the first housing 11 on the axially central side, a first outlet 11c that allows fluid to flow out from the first expansion mechanism 2b side, and a first that allows fluid to flow out from the second expansion mechanism 2c side. Two outlets 11d are provided, and the first and second outlets 11c and 11d are arranged close to each other in the axial direction of the expander body 2a. The inside of the first housing 11 is partitioned into one end side and the other end side in the axial direction by a partition wall 11e provided in the center in the axial direction. An inflow chamber 11f communicating with the second inflow ports 11a and 11b is provided. Further, the peripheral surface of the first housing 11 is provided with outflow holes 11g corresponding to the first and second expansion mechanisms 2b and 2c, respectively. To communicate with each other. A first pipe connecting member 13 communicating with the first and second inlets 11a and 11b is attached to the first housing 11, and an external pipe is connected to the first pipe connecting member 13. Two connection ports 13a are provided. The first housing 11 is provided with a second pipe connecting member 14 communicating with the first and second outlets 11c and 11d, and an external pipe is connected to the second pipe connecting member 14. One connection port 14a is provided. Further, the first housing 11 is provided with an opening / closing valve 15 for opening and closing the second inlet 11b. When the opening / closing valve 15 is closed, the fluid flowing in from the first pipe connecting member 13 is transferred to the first inlet 11a. Only to flow into. In this case, the on-off valve 15 may be configured to automatically open and close by a drive mechanism such as a solenoid, but may be manually opened and closed.

  The first and second expansion mechanisms 2b and 2c are formed by an eccentric rocking motion of the movable scroll member 30 and the fixed scroll member 20 and the movable scroll member 30 which are disposed in the expander body 2a so as to face each other in the axial direction. The output shaft 40 is a rotating shaft that rotates.

  The fixed scroll member 20 is fixed to the other end side of the first housing 11, and a spiral body 20 a facing the movable scroll member 30 is provided on one end surface thereof. In addition, a flow hole 20 b for flowing the fluid in the inflow chamber 11 f of the first housing 11 is provided in the center in the radial direction of the fixed scroll member 20.

  The movable scroll member 30 has a spiral body 30a opposed to the fixed scroll member 30 at one end surface, and the spiral body 30a of the movable scroll member 30 meshes with the spiral body 20a of the fixed scroll member 20 so as to be eccentrically swingable. An engagement pin 31 is provided on one end side of the other end surface of the movable scroll member 30 in the radial direction so as to engage with the long hole 12b of the second housing 12 so as to be movable in the radial direction. The engagement pin 31 and the long hole 12b The rotation of the movable scroll member 30 is restricted by this engagement. A boss 30b is provided at the center of the other end surface of the movable scroll member 30, and an eccentric bush 32 is rotatably provided in the boss 30b. A support shaft 32a that is coaxial with the output shaft 40 protrudes from one end side of the eccentric bush 32, and a balance weight 33 for correcting the static balance is attached to the support shaft 32a.

  One end side of the output shaft 40 is rotatably supported by the inner peripheral surface of the extending portion 12 a of the first housing 11, and the large-diameter portion 40 a provided on the other end side is freely rotatable within the first housing 11. It is supported by. The support shaft 32a of the eccentric bush 32 is rotatably inserted in the center of the large diameter portion 40a in the radial direction, and the radial shaft one end side of the large diameter portion 40a is rotatably connected to one radial end side of the eccentric bush 32. A mating eccentric pin 40b is projected. Further, a threaded portion 40 c is provided at one end of the output shaft 40.

  The first and second generators 2d and 2e are composed of a power generation coil 51 fixed to one end of the expander body 2a, a plurality of magnets 52 arranged in a ring around the power generation coil 51, and an output shaft 40. It comprises a cylindrical rotor 53 as a rotating body that rotates integrally with each magnet 52.

  The power generating coil 51 is wound around a stator 54 formed in an annular shape, and an extending portion 12 a of the first housing 11 is inserted on the inner peripheral surface side of the stator 54. A plurality of bolt insertion holes 54 a extending in the axial direction are provided in the stator 54 at intervals in the circumferential direction, and the plurality of bolts 55 inserted into the respective bolt insertion holes 54 a are screwed into the screw holes 12 c of the second housing 12. By combining, the stator 54 is fixed to the first housing 11.

  Each magnet 52 is made of a permanent magnet such as a ferrite magnet, and is formed to be curved along the inner peripheral surface of the rotor 53. The magnets 52 are arranged in the circumferential direction of the rotor 53 and are fixed to the inner circumferential surface of the rotor 53.

  The rotor 53 is open at one end in the axial direction, and is formed so as to accommodate the power generation coil 51 inside thereof. At the center of the other end surface of the rotor 53, a hole 53a that passes through one end of the output shaft 40 is provided, and a nut 56 is screwed into the threaded portion 40c of the output shaft 40 that is inserted through the hole 53a. 40 is fixed.

  Here, the operation of the Rankine system will be described. That is, when power generation and hot water supply are performed in the Rankine system, the open / close valve 15 of the expander 2 is opened, and the downstream side of the evaporator 1 is communicated with the expander 2 by the second three-way valve 6a. Thereby, the working fluid heated and evaporated by the evaporator 1 flows into each expansion mechanism 2b, 2c of the expander 2, and expands in each expansion mechanism 2b, 2c. At that time, the expansion mechanisms 2b and 2c are rotated by the expansion of the working fluid, and the first and second generators 2d and 2e of the expander 2 are driven. The working fluid flowing out from the expander 2 flows into the condenser 3 and is condensed by the condenser 3. At that time, the working fluid flowing through the condenser 3 exchanges heat with the heat medium of the heat medium circuit 5, and the heat medium heated by this heat exchange passes through the heat medium circuit 5 through the heating unit 7 b of the water heater 7. The hot water A in the tank 7a is heated by the heat medium flowing through the heating unit 7b. At that time, by operating the auxiliary heater 8, the hot water A in the tank 7a is also heated by the auxiliary heater 8. On the other hand, the working fluid that has flowed out of the condenser 3 is sucked into the pump 4, discharged to the evaporator 1 side, and evaporated again by the evaporator 1.

  Further, when the on-off valve 15 of the expander 2 is closed when performing the power generation and hot water supply, the working fluid flowing into the expander 2 flows only into the first expansion mechanism 2b, and only by the first generator 2d. Power generation is performed. As a result, the temperature on the outflow side of the expander 2 becomes higher than when the working fluid is expanded by both of the expansion mechanisms 2b and 2c, and the amount of heat applied to the heat medium of the heat medium circuit 5 increases.

  Furthermore, when only the hot water supply is performed in the Rankine system, the downstream side of the evaporator 1 is communicated with the bypass flow path 6 by the three-way valve 6a. As a result, the working fluid flowing out of the evaporator 1 flows into the upstream side of the condenser 3 via the bypass channel 6, and the heat medium heated by the condenser 3 passes through the heat medium circuit 5 as described above. The hot water A in the tank 7a flows through the heating unit 7b of the water heater 7, and is heated by the heat medium flowing through the heating unit 6b. At that time, by operating the auxiliary heater 8, the hot water A in the tank 7 a is also heated by the auxiliary heater 8.

  Next, the operation of the expander 2 in the Rankine system will be described. That is, when the working fluid evaporated in the evaporator 1 flows into the first pipe connection member 13 of the expander 2, the working fluid flows into the first and second inlets 11a and 11b, and the first and second inlets respectively. The expansion mechanisms 2b and 2c expand. In this case, when the working fluid flows between the scroll members 20 and 30 through the inflow chamber 11f and the flow hole 20b, the working fluid expands between the spiral bodies 20a and 30a, and the movable scroll member 30 is moved to the spiral bodies 20a. , 30a, an eccentric oscillating motion is performed around the engaging pin 31 so as to enlarge the volume between them. As a result, the eccentric bush 32 in the boss portion 30 b of the movable scroll member 30 rotates about the support shaft 32 a, and the eccentric pin 40 b that engages with the eccentric bush 32 is centered on the axis A of the output shaft 40 by the eccentric bush 32. The output shaft 40 is rotated by the eccentric pin 40b. When the output shaft 40 of the first and second expansion mechanisms 2b and 2c rotates, the rotors 53 of the first and second generators 2d and 2e rotate together with the output shaft 40, respectively, and each magnet 52 becomes a generator coil. Revolve around 51 around the output shaft 40. Thereby, the alternating voltage by the magnetic flux of each magnet 52 is induced in the power generation coil 51, and electric power is generated. Further, the working fluid expanded by the first and second expansion mechanisms 2b and 2c flows out from the first and second outlets 11c and 11d via the second pipe connection member 14.

  As described above, according to the expander of the present embodiment, the first and second generators 2e are driven by the rotation shafts of the first and second expansion mechanisms 2b and 2c. , 2c can be operated without using a bypass circuit, and the entire system can be downsized. Further, since the first generator 2d is integrally provided on one end side of the expander body 2a and the second generator 2e is integrally provided on the other end side, the power transmission mechanism is connected to a separate generator. Therefore, the structure can be simplified and the cost can be reduced. In this case, since the installation space for the expander and the generator is not required, the Rankine system as a whole can be reduced in size. Furthermore, since the first and second expansion mechanisms 2b and 2c can be connected in parallel, the rotation speeds of the first and second generators 2d and 2e can always be made uniform. Thereby, only one generator does not become high rotation by rotation imbalance of each generator like the case where it connects in series, and it is convenient in terms of durability.

  Further, each of the first and second generators 2d and 2e is divided into a generator coil 51 fixed to the expander body 2a, a plurality of magnets 52 arranged in a ring around the generator coil 51, and an output shaft 40. Since each of the magnets 52 and the rotor 53 that rotates integrally with each other is formed, a magnet generator with a simple structure can be formed integrally, which is extremely advantageous for downsizing and cost reduction.

  Further, the first and second expansion mechanisms 2b and 2c are eccentrically oscillated by the expansion of the fluid flowing between the fixed scroll member 20 and the fixed scroll member 20 disposed in the expander body 2a. Since each of the movable scroll members 30 that rotates the output shaft 40 is configured, a small and efficient scroll expander can be configured, which is extremely advantageous for practical use.

  Furthermore, the first inflow port 11a that allows fluid to flow into the first housing 11 of the expander body 2a and the second flow that causes fluid to flow into the second expansion mechanism 2c side. Since the inlet 11b is provided and the first and second inlets 11a and 11b are arranged close to each other, the external piping on the inflow side can be easily connected. In this case, since the connection port 13a with the pipe is formed so as to communicate with each of the first and second inflow ports 11a and 11b, the external pipe can be connected without branching, thereby simplifying the pipe. Can be planned.

  Further, a first outlet 11c flowing out from the first expansion mechanism 2b side and a second outlet 11d flowing out from the second expansion mechanism 2c side are provided in the first housing 11 of the expander body 2a. Since the first and second outlets 11c and 11d are provided close to each other, the external piping on the inflow side can be easily connected as described above. In this case, since the connection port 14a with the piping is formed so as to communicate with each of the first and second outlets 11c and 11d, the external piping can be connected without branching, and the piping can be simplified. Can be planned.

  Furthermore, since the on-off valve 15 that opens and closes the second inflow port 11b arbitrarily is provided in the expander body 2a, by closing the on-off valve 15 and blocking the inflow of the working fluid to the second inflow port 11b, It is possible to generate power only by the first expansion mechanism 2b and the first generator 2d by flowing the working fluid only into the first inlet 11a. As a result, it is possible to switch between power generation by the first and second generators 2d and power generation by only the first generator 2d as necessary, and efficient operation is always possible. In this case, since the second inflow port 11b is opened and closed by the on-off valve 15 provided in the expander main body 2a, for example, an expensive three-way valve or an electromagnetic valve is provided in the external pipe to the second inflow port 11b. The structure can be simplified and the cost can be reduced as compared with the case of opening and closing the flow path.

  Moreover, the Rankine system of this embodiment heats the hot water A in the tank 7a by the heat medium circuit 5 which distribute | circulates the heat medium which heat-exchanges with a working fluid to the condenser 3, and the heat medium which distribute | circulates the heat medium circuit 5. Since the hot water heater 7 is provided, the hot water A of the hot water heater 7 can be generated using the condensed heat absorbed from the working fluid of the condenser 3, and the heat of the working fluid is efficiently used for power generation and hot water respectively. Can be used.

  Furthermore, since the working fluid flowing out of the evaporator 1 is made to flow into the condenser 3 without passing through the expander 2 by switching the flow path by the three-way valve 6a and flowing it through the bypass flow path 6, The hot water A of the water heater 7 can be heated by the working fluid, and hot water having a necessary temperature can be quickly generated.

  In the above embodiment, the expander 2 has a scroll-type configuration. However, the first expander has a structure equivalent to that of other types of expanders such as a reciprocating expander using a piston and an inclined plate. It is also possible to constitute the second expansion mechanism.

  Moreover, although the thing using the expander 2 was shown to the Rankine system provided with the water heater 7 in the said embodiment, you may make it use for the Rankine system of the structure which performs only electric power generation.

Side surface sectional drawing of the expander which shows one Embodiment of this invention Exploded side sectional view of main parts of expander Front view of rotor and magnet Schematic configuration diagram of Rankine system using the expander of the present invention

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Evaporator, 2 ... Expander, 2a ... Expander main body, 2b ... 1st expansion mechanism, 2c ... 2nd expansion mechanism, 2d ... 1st generator, 2e ... 2nd generator, 3 ... Condenser, 4 ... Pump, 5 ... Heat medium circuit, 6 ... Bypass circuit, 6a ... Three-way valve, 7 ... Water heater, 11a ... First inlet, 11b ... Second inlet, 11c ... First flow Outlet, 11d ... second outlet, 13a ... first connection port, 14a ... second connection port, 20 ... fixed scroll member, 30 ... movable scroll member, 40 ... output shaft, 51 ... power generation coil, 52 ... Magnet, 53 ... rotor.

Claims (11)

A first expansion mechanism that is disposed on one end side of the expander body and rotates a rotation shaft by expansion of fluid that has flowed into one end side in the expander body, and disposed on the other end side of the expander body. In an expander comprising a second expansion mechanism that rotates a rotating shaft by expansion of fluid that has flowed into the other end of the inside,
A first generator provided integrally on one end side of the expander body and driven by a rotating shaft of a first expansion mechanism;
An expander comprising: a second generator provided integrally with the other end of the expander body and driven by a rotation shaft of a second expansion mechanism. The first generator is integrated with each magnet by a power generation coil fixed to one end of the expander body, a plurality of magnets arranged in an annular shape around the power generation coil, and a rotation shaft of the first expansion mechanism. It consists of a rotating body that rotates,
The second generator is integrated with each magnet by a power generation coil fixed to the other end of the expander body, a plurality of magnets arranged annularly around the power generation coil, and a rotation shaft of the second expansion mechanism. The expander according to claim 1, wherein the expander is configured of a rotating body that rotates in a rotating manner. A movable scroll that rotates the rotating shaft by causing the first and second expansion mechanisms to swing eccentrically by expansion of a fluid that flows between the fixed scroll member disposed in the expander body and the fixed scroll member. The expander according to claim 1, wherein each of the expanders is constituted by a member. The expander body is provided with a first inlet for allowing fluid to flow into the first expansion mechanism, and a second inlet for allowing fluid to flow into the second expansion mechanism,
The expander according to claim 1, 2 or 3, wherein the first and second inflow ports are arranged close to each other. The expander according to claim 4, wherein a connection port with a pipe through which a fluid flows into the expander main body is formed so as to communicate with each of the first and second inflow ports. The expander according to claim 4 or 5, wherein an opening / closing valve is provided in at least one of the first and second inflow ports. The expander body is provided with a first outlet that allows fluid to flow out from the first expansion mechanism side, and a second outlet that allows fluid to flow out from the second expansion mechanism side,
The expander according to claim 1, 2, 3, 4, 5 or 6, wherein the first and second inflow ports are arranged close to each other. 8. The expander according to claim 7, wherein a connection port with a pipe through which a fluid flows out from the expander main body is formed so as to communicate with each of the first and second outflow ports. An evaporator that heats and evaporates the working fluid with a predetermined heat source; a power generator that generates power by expansion of the working fluid evaporated by the evaporator; and a condenser that condenses the working fluid flowing out of the power generator; In the Rankine system that includes a pump that sucks the working fluid flowing out of the condenser and discharges it to the evaporator side, and generates power using a power generator as a drive source,
The expander according to claim 1, 2, or 3 is used as the power generator. A Rankine cycle power generator. A heat medium circuit for circulating a heat medium that exchanges heat with the working fluid in the condenser;
The Rankine system according to claim 9, further comprising a high-temperature fluid generator that heats another predetermined fluid by a heat medium that circulates in the heat medium circuit. A bypass flow path having one end connected to the flow path between the evaporator and the power generator and the other end connected to the inflow side of the condenser;
The Rankine system according to claim 10, further comprising a flow path switching valve that allows the working fluid flowing out of the evaporator to freely flow through the bypass flow path.

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